WorldWideScience

Sample records for natuerliche tracer fuer

  1. Polonium-210 and lead-210 in the Southern Polar Ocean: Naturally occurring tracers of biological and hydrographical processes in the surface waters of the Antarctic Circumpolar Current and the Weddell Sea; Polonium-210 und Blei-210 im Suedpolarmeer: Natuerliche Tracer fuer biologische und hydrographische Prozesse im Oberflaechenwasser des Antarktischen Zirkumpolarstroms und des Weddellmeeres

    Energy Technology Data Exchange (ETDEWEB)

    Friedrich, J.

    1997-11-01

    In this thesis the distribution of {sup 210}Po and {sup 210}Pb in the upper 600 m of the Antarctic Circumpolar Current and the Weddell Sea was investigated along north-south transects in austral spring and autumn. {sup 210}Po and {sup 210}Pb can serve as sensitive tracers for the special hydrographic conditions of the Antarctic Circumpolar Current and the Weddell Sea as well as for biological processes during phytoplankton blooms. The {sup 210}Po/{sup 210}Pb disequilibrium was used as a tracer for particle export. This tracer integrates export on a timescale of 276 days because of the 138 day half-life of {sup 210}Po and complements the {sup 234}Th/{sup 238}U disequilibrium as another tracer for plankton production and export on a shorter timescale of several weeks. (orig.) [Deutsch] In der vorliegenden Arbeit wurde die Verteilung von Blei-210 und seinem Enkelnuklid Polonium-210 im Antarktischen Zirkumpolarstrom und im Weddellmeer bis 600 m Tiefe in mehreren meridionalen Transekten im australen Fruehjahr und Herbst waehrend der `Polarstern`-Expeditionen ANT-X/6 und ANT-XI/4 untersucht. Die Verteilung von {sup 210}Pb und {sup 210}Po wird von mehreren Faktoren beeinflusst, sowohl durch die Advektion von Wassermassen im Antarktischen Zirkumpolarstrom und im Weddellmeer als auch von biologischen Prozessen z.B. innerhalb einer Planktonbluete. Bevor die Verteilungsmuster von {sup 210}Pb und {sup 210}Po jedoch als Tracer fuer einen Prozess genutzt werden koennen, muss der Effekt der einzelnen Faktoren auf die Verteilung betrachtet werden. (orig.)

  2. Radon-222 and beryllium-7 as natural tracer; Radon-222 und Beryllium-7 als natuerliche Tracer

    Energy Technology Data Exchange (ETDEWEB)

    Frank, G.; Steinkopff, T. [Deutscher Wetterdienst, Offenbach (Germany). Radioaktivitaetsueberwachung; Salvamoser, J. [Institut fuer Angewandte Isotopen-, Gas- und Umweltuntersuchungen (IGU), Woerthsee (Germany)

    2016-07-01

    The Global Atmosphere Watch Program (GAW) is intended to analyse worldwide the influence of anthropogenic emissions to the atmosphere. Data are continuously transferred to the ''World Data Centre for Green House Gases'' of the WMO. For the study of atmospheric transports the natural radionuclides Rn-222, Be-7, Pb-210, Pb- 214 and Bi-214 are continuously measured at the Umweltforschungsstation Schneefernerhaus (2650 m) and at the Zugspitze (2962 m) by the Deutscher Wetterdienst (DWD, German Weather Service). The measurements support the classification of atmospheric transport, atmospheric dilution and dispersion models of gaseous and aerosol bond micro pollutants. Results are carried out in combination with meteorological data. It is shown the optimization and effect of a new sampling site for the measurement of Rn-222 activity at the Zugspitze. Results of Rn-222 and Be-7 concentrations are shown in relation to horizontal and vertical dispersion of air masses. The origin of natural Rn-222 and Be-7 are known, therefore both nuclides are well suited for the research of atmospheric transport. Rn-222 is an ideal tracer, because there is no influence by atmospheric processes (chemical processes, wash out effects).

  3. Natural and anthropogenic environmental hazards. Research results of the Department of Applied Geology; Natuerliche und anthropogene Umweltgefaehrdungen. Forschungsergebnisse aus dem Lehrstuhl fuer Angewandte Geologie

    Energy Technology Data Exchange (ETDEWEB)

    Czurda, K.; Eiswirth, M.; Hoetzl, H. [comps.

    1998-12-31

    Applied geology is employed in mining geology, raw materials geology, engineering geology, and hydrogeology, of which the two last-mentioned are the most important for the Department of Applied Geology. This series of publications arose from the need of making research findings, dissertations, theses and conference papers accessible to the public faster and more comprehensively than in national and international journals. [Deutsch] Die Aufgaben der angewandten Geologie sind im weitesten Sinne in der Montangeologie, in der Rohstoffgeologie, in der Ingenieurgeologie und in der Hydrogeologie zu sehen. Der engere Aufgabenbereich der Institute fuer Angewandte Geologie konzentriert sich der heutigen Fragestellung entsprechend meist auf die Ingenieurgeologie und Hydrogeologie. Wenn wir daraus noch die Umweltgeologie ableiten, so ist der Lehr- und Forschungsschwerpunkt auch des Karlsruher Lehrstuhles fuer Angewandte Geologie (AGK=Angewandte Geologie Karlsruhe) umrissen. Die vorliegende Schriftenreihe ist aus der Notwendigkeit entstanden, Forschungsergebnisse, Dissertationen und ausgewaehlte Diplomarbeiten sowie Beitraege einschlaegiger Tagungen in Karlsruhe rascher und u.U. umfangreicher als in internationalen oder nationalen Journalen moeglich zu publizieren. (orig.)

  4. Environmental relevance of natural refrigerants in heat pumps; Umweltrelevanz natuerlicher Kaeltemittel in Waermepumpen

    Energy Technology Data Exchange (ETDEWEB)

    Zogg, M. [Bundesamt fuer Energie, Oberburg (Switzerland)

    2000-04-01

    On behalf of the Federal Office for energy in a global ecological balance the environmental compatibility of natural refrigerants is compared with the influence of fluorocarbons for heat pumps, water chillers, brine chillers and the supermarket refrigeration. In this paper the environmental relevance of the use of the natural refrigerants propane and CO{sub 2} is compared with fluorocarbons R 134a, R 407C, 404A and Isceon 59. (orig.) [German] Im Auftrag des Bundesamts fuer Energie wurden in einer umfassenden Oekobilanz die Umweltvertraeglichkeit natuerlicher Kaeltemittel mit den heute ueblichen Fluorkohlenwasserstoffen fuer Waermepumpen, Kaltwassersaetze, Solesaetze und die Supermarktkuehlung verglichen. In diesem Beitrag wird daraus die Umweltrelevanz der Verwendung der natuerlichen Kaeltemittel Propan und CO{sub 2} anstelle der Fluorkohlenwasserstoffe R 134a, R 407C, R 404A und Isceon 59 in Waermepumpen aufgezeigt. (orig.)

  5. Natural radioactivity in construction materials; Natuerliche Radioaktivitaet in Bauprodukten

    Energy Technology Data Exchange (ETDEWEB)

    Hoffmann, Bernd [Bundesamt fuer Strahlenschutz, Berlin (Germany)

    2017-04-01

    Rocks and soils contain traces of uranium and thorium and their daughter products, also the primordial nuclide K-40. Most construction materials are produced from mineral raw materials and residuals from industrial processes, thus natural radionuclides can be detected. The radionuclide concentrations are relevant with respect to radiation protection. Radionuclides in construction materials can cause indoor radiation exposure due to their gamma radiation and due to inhalation of radon a gaseous nuclide that can diffuse out of the materials. Based on new legal developments in the European Union the Bundesamt fuer Strahlenschutz is now again concerned with radiation protection issues of building materials.

  6. Studies on the preparation of low-carrier Se-73,75 tracers for in vivo examinations; Untersuchungen zur Darstellung traegerarm 73,75Se-markierter Tracer fuer in vivo Untersuchungen

    Energy Technology Data Exchange (ETDEWEB)

    Helfer, Andreas

    2013-04-03

    With the growing importance of positron emission tomography (PET) for in vivo imaging in diagnostic medicine there is great interest of developing new labelling methods for the positron emitter selenium-73. As attractive application an examination of a no-carrier-added (n.c.a.) preparation of the analogous tracer Sulindac Selenid and of the selenium containing compound Ebselen was examined with {sup 73,75}Se. First of all a labelling strategy for Sulindac Selenid based on a protected precursor was developed. This precursor should further be transformed into the corresponding standard compound for chomatographic identification of the n.c.a. product. This, however, was not possible. An alternative synthesis method also did not result in a product. Thus, a radioactive labelling in case of Sulindac Selenid was not indicated in spite of a successful synthesis of a precursor. The preparation of Ebselen was performed as earlier described by a sequential one-pot synthesis with a yield of 46 %. An adaption of the reaction parameters to a radiosynthesis with {sup 75}Se failed on the n.c.a. state and also after adding carrier to the reaction mixture. The desired product could, however, be prepared in a copper catalysed one-pot radiosynthesis for the first time under carrier-added conditions. Here, optimized conditions resulted in radiochemical yields of 60 ± 18 %. A no-carrier-added product could finally be achieved using sulphur as nonisotopic carrier in the reaction mixture. After optimisation of reaction parameters n.c.a. [{sup 75}Se]Ebselen could be synthesized with radiochemical yields of 55 ± 7 % within 4 h. Furthermore the desired product could be separated by RHPL-chromatography from its co-produced sulfur-analogue. After transferring the conditions to radiosyntheses with the positron emitter {sup 73}Se, n.c.a. [{sup 73}Se]Ebselen could be achieved with a radiochemical yield of 22 ± 1 % and can now be used as a potential radiotracer in preclinical evaluation

  7. Comparative analysis of the cost of waste management options for Berlin; Kostenvergleich der Abfallwirtschaftsalternativen fuer Berlin

    Energy Technology Data Exchange (ETDEWEB)

    Oetjen-Dehne, R. [u.e.c., Berlin (Germany)

    2002-07-01

    The Berlin/Brandenburg region is getting under pressure as the waste treatment deadline of 1 June 2005 is getting closer and sufficient plant capacities are lacking. The contribution presents a chronology of the discussion of the available plant variants. [German] Die Sicherung der gesetzlich geforderten Abfallbehandlung ab dem 01.06.2005 geraet in der Region Berlin/Brandenburg immer mehr unter Zeitdruck, da ausreichende Anlagenkapazitaeten nicht zur Vefuegung stehen. Waehrend im Land Brandenburg die benoetigten Kapazitaeten weitgehend erst nach Durchfuehrung von VOB- oder VOL-Ausschreibungen (ueberwiegend im Jahr 2002) geschaffen werden, hat der Berliner Senat im Sommer 2001 auf der Basis eines Konzeptes der Berliner Stadtreinigung (sog. STAB-Modell) ein Behandlungskonzept beschlossen, das sich nun in der Umsetzung befindet. Dem Senatsbeschluss gingen umfangreiche gutachterliche Analysen und kontroverse Diskussionen, natuerlich auch ueber die kuenftig zu erwartenden Kosten, voraus. Nachdem im folgenden zunaechst auf einige fast schon banale allgemein gueltige Voraussetzungen fuer eine sachliche Kostendiskussion eingegangen wird, wird ein chronologischer Ueberblick zur Variantendiskussion in Berlin gegeben. (orig.)

  8. Is natural radioactivity and ionizing radiation necessary for us and our earth?; Sind (natuerliche) Radioaktivitaet und ionisierende Strahlung fuer uns und unsere Erde notwendig?

    Energy Technology Data Exchange (ETDEWEB)

    Voelkle, Hansruedi [Fribourg Univ. (Switzerland). Physikdepartement

    2017-04-01

    Artificial radioactive materials and ionizing radiation are used in medicine, industry and science. Is there also a purpose in the sense of Aristoteles that nothing on earth is unnecessary? The contribution discusses examples of natural radioactivity in the atmosphere, the production of geothermal energy and the role of radioactivity and ionizing radiation in evolution.

  9. Metrology of natural radionuclides. Current challenges in radiation protection for industry and the environment; Metrologie natuerlicher Radionuklide. Aktuelle Herausforderungen fuer den Strahlenschutz in Industrie und Umwelt

    Energy Technology Data Exchange (ETDEWEB)

    Maringer, F.J. [Bundesamt fuer Eich- und Vermessungswesen, Wien (Austria). Referat fuer ionisierende Strahlung und Radioaktivitaet; Univ. fuer Bodenkultur, Wien (Austria). Low-Level Counting Lab. Arsenal; Moser, H.; Kabrt, F. [Bundesamt fuer Eich- und Vermessungswesen, Wien (Austria). Referat fuer ionisierende Strahlung und Radioaktivitaet; Baumgartner, A.; Stietka, M. [Univ. fuer Bodenkultur, Wien (Austria). Low-Level Counting Lab. Arsenal

    2015-07-01

    In a range of industrial branches increased activity concentrations of natural radionuclides occur in various NORM materials processed. The ICRP 103 recommendation, and subsequent the IAEA International Basic Safety Standards and the European Basic Safety Standards for Radiation Protection, raised new challenges in radiation protection concerning natural radionuclide metrology and activity measurement methods - in particular for natural decay chain radionuclides ({sup 238}U+, {sup 232}Th+, {sup 235}U+). Especially adequate traceability and optimized measurement uncertainties of applied activity measurement methods are of increasing concern. In this paper a review on radionuclide metrology of natural radionuclides and its implementation to end-user activity measurement methods and practice is presented. This includes an overview on current and emerging drivers, targets, challenges, deliverables, technologies and stakeholders in the field. Current research results on activity measurement standards and instrumentation for natural radionuclides, revised decay data, in-situ measurement methods, NORM reference materials, are covered as well as benefits of natural radionuclide metrology on radiation protection of workers and the public.

  10. Natural refrigerants for air conditioners in passenger cars. A contribution to climate protection. Background; Natuerliche Kaeltemittel fuer PKW-Klimaanlagen. Ein Beitrag zum Klimaschutz. Hintergrund

    Energy Technology Data Exchange (ETDEWEB)

    Hoffmann, Gabriele; Plehn, Wolfgang

    2010-09-15

    Air conditioners in passenger cars contain a refrigerant which significantly increases the greenhouse effect. Currently about 30 % of global emissions of partially fluorinated hydrocarbons originate from these air conditioners. According to the directive 2006/40/EC, this refrigerant must be replaced by a less harmful substance. Under this aspect, the contribution under consideration initially reports on the stock and level of air conditioning of passenger cars as well as on the refrigerant tetrafluoroethane. Subsequently, refrigerants for air conditioning of passenger cars such as carbon dioxide, 1.1-difluoroethane and 2,3,3,3-tetrafluoro propylene are described. Overall, the refrigerant carbon dioxide is the best alternative for mobile air conditioning.

  11. Environmental Tracers

    Directory of Open Access Journals (Sweden)

    Trevor Elliot

    2014-10-01

    Full Text Available Environmental tracers continue to provide an important tool for understanding the source, flow and mixing dynamics of water resource systems through their imprint on the system or their sensitivity to alteration within it. However, 60 years or so after the first isotopic tracer studies were applied to hydrology, the use of isotopes and other environmental tracers are still not routinely necessarily applied in hydrogeological and water resources investigations where appropriate. There is therefore a continuing need to promote their use for developing sustainable management policies for the protection of water resources and the aquatic environment. This Special Issue focuses on the robustness or fitness-for-purpose of the application and use of environmental tracers in addressing problems and opportunities scientifically, to promote their wider use and to address substantive issues of vulnerability, sustainability, and uncertainty in (groundwater resources systems and their management.

  12. Bromide as a tracer for studying water movement and nitrate displacement in soils: comparison with stable isotope tracers; Bromid als Tracer zur Untersuchung der Wasserbewegung und der Nitratverlagerung in Boeden: Vergleich mit stabilisotopen Tracern

    Energy Technology Data Exchange (ETDEWEB)

    Russow, R.; Knappe, S. [UFZ - Umweltforschungszentrum Leipzig-Halle GmbH, Bad Lauchstaedt (Germany). Sektion Bodenforschung

    1999-02-01

    Tracers are an ideal means of studying water movement and associated nitrate displacement. Often bromide is preferred as a tracer because it is considered a representative tracer for water and because, being a conservative tracer (i.e. not involved in chemical and biological soil processes), it can be used for studying anion transport in soils. Moreover, it is less expensive and easier to measure than the stable isotopes deuterium and {sup 15}N. Its great advantage over radioactive tracers (e.g. tritium), which outweighs their extreme sensitivity and ease of measurement and which it has in common with stable isotopes, is that it does not require radiation protection measures. However, there are also constraints on the use of bromide as a tracer in soil/water/plant systems. Our own studies on different soils using D{sub 2}O, bromide and [{sup 15}N]-nitrate in lysimeters suggest that the above assumptions on bromide tracers need not always be valid under conditions as they prevail in biologically active soils. As the present paper shows, these studies permit a good assessment of the possibilities and limits to these tracers. [Deutsch] Fuer die Untersuchung der Wasserbewegung sowie der daran gekoppelten Nitrat-Verlagerung ist der Einsatz von Tracern das Mittel der Wahl. Dabei wird Bromid als Tracer haeufig bevorzugt, da es allgemein als ein repraesentativer Tracer fuer Wasser und als konservativer Tracer (nicht involviert in chemische und biologische Bodenprozesse) zur Untersuchung des Anionentransportes in Boeden angesehen wird und es gegenueber den stabilen Isotopen Deuterium und {sup 15}N billiger und einfacher zu bestimmen ist. Gegenueber den radioaktiven Tracern (z.B. Tritium), die zwar sehr empfindlich und einfach messbar sind, besteht der grosse Vorteil, dass, wie bei den stabilen Isotopen, keine Strahlenschutzmassnahmen ergriffen werden muessen. Es gibt jedoch auch einschraenkende Hinweise fuer die Verwendung von Bromid als Tracer im System Boden

  13. Development of a transcritical two-stage supermarket refrigerator for deep freezing and normal cooling; Entwicklung einer transkritischen zweistufigen Supermarktkaelteanlage fuer Tief- und Normalkuehlung

    Energy Technology Data Exchange (ETDEWEB)

    Gebhardt, D.; Kruse, H. [FKW GmbH, Hannover (Germany); Schiesaro, P. [Arneg S.p.a., Campo S. Martino (Italy)

    2003-07-01

    The contribution presents the results of trial operation of a newly developed two-stage transcritical supermarket refrigerator with CO2 as working fluid.Technical problems, e.g. oil recirculation to the high-pressure compressor, were solved by modifying the design. The performance of the system was far behind the calculations. Four reasons for this were identified: First, the large oil volume inside the system. Secondly, the compressor quality was not as expected. Thirdly, excessive pressure loss in the suction line of the high-pressure compressor. And last but not least, too low suction gas superheating in the compressor. [German] Der Trend, natuerliche umweltfreundliche Kaeltemittel in der Kaeltetechnik zu verwenden, fuehrte zu der Entwicklung eines zweistufigen CO{sub 2}-Supermarktsystems mit transkritischer Arbeitsweise. Theoretische Studien wurden durchgefuehrt, um die beste Anlagenschaltung fuer den Supermarktsektor zu ermitteln. Dies fuehrte zu der Entwicklung eines optimierten Prozesses, der auf der Hochdruckseite einen zweistufigen Verdichter verwendet. Nach entsprechender Auswahl geeigneter Komponenten war es moeglich, die Anlage zu bauen und unter stabilen Bedingungen aber nur zu betreiben bei der Verwendung eines einstufigen Verdichters im transkritischen Kreislauf mit einer geringeren Kaelteleistungszahl. Viele technische Probleme wurden festgestellt, insbesondere in bezug auf die Oelrueckfuehrung zum Hochdruckverdichter und die entsprechende Gestaltung der Kaeltemaschinenanlage. Um diese Probleme zu beseitigen, war es noetig, die urspruengliche Auslegung des Systems zu veraendern. Die gemessene Kaelteleistungszahl war wesentlich niedriger als die theoretisch berechnete. Vier wesentliche Gruende koennen fuer diese reduzierte Kaelteleistungszahl festgestellt werden: Ein Grund war der Einfluss der grossen Oelmenge im System. Der zweite Grund koennte ein geringerer Verdichterguetegrad als angenommen sein. Der dritte Grund war der zu hohe Druckverlust in

  14. Energy for Germany 2000. Facts, views and positions in a global trend. Goals of the global and national policies in the 21st century: Competitive strength, assured supply, environmental compatibility; Energie fuer Deutschland 2000. Fakten, Perspektiven und Positionen im globalen Kontext. Schwerpunktthema 'Ziel globaler und nationaler Energiepolitik im 21. Jahrhundert: Wettbewerbsfaehig - versorgungssicher - umweltvertraeglich'

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2000-07-01

    The publication is based on the publication 'Energy for Tomorrow's World - Acting Now.', which was published by the World Energy Council in 2000. It presents an analysis of the current situation and contains suggestions for actions that should be taken in the period up to 2020. While national energy policy will still be required, it can only be successful if global aspects are not neglected. This includes the consideration of the responsibility of the industrial nations for third world countries. The energy concept presented here intends to take account of the decisive global aspects. [German] Die Darstellung der globalen Aspekte stuetzt sich auf die Standortbestimmung 2000 des Weltenergierates 'Energy for Tomorrow's World - Acting Now.'. Diese Standortbestimmung unterzieht die Anfang der 90er Jahre erschienene globale Studie des Weltenergierates einer kritischen Ueberpruefung, stellt Abweichungen von den damals angenommenen Entwicklungsperspektiven fest und gibt vor allem konkrete Handlungsempfehlungen fuer die Zeit bis zum Jahr 2020, also fuer die Zeitspanne, die konkret ueberschaubar und gestaltbar ist. Die neue Standortbestimmung des Weltenergierates unterstreicht, dass nationale Energiepolitik zwar weiterhin notwendig ist, aber nur dann auf Dauer erfolgreich sein wird, wenn sie auf diese globalen Aspekte ausgerichtet ist. Dazu gehoert auch, dass westliche, entwickelte Laender sich bewusst sind, dass eine nationale Energiepolitik zu Lasten der Dritten Welt nicht nur keine Zukunft hat, sondern vor allem nicht zu verantworten ist. Dies gilt natuerlich ebenso fuer die Umweltpolitik. An diesen Massstaeben wird sich auch das konkrete Energiekonzept messen lassen muessen, das nun fuer die Bundesrepublik Deutschland auf der Basis des 'Energiedialogs 2000' erarbeitet werden soll. Mit der hier vorgelegten Publikation will das Deutsche Nationale Komitee des Weltenergierates dazu beitragen, dass in diesem Energiekonzept die

  15. Packet Tracer network simulator

    CERN Document Server

    Jesin, A

    2014-01-01

    A practical, fast-paced guide that gives you all the information you need to successfully create networks and simulate them using Packet Tracer.Packet Tracer Network Simulator is aimed at students, instructors, and network administrators who wish to use this simulator to learn how to perform networking instead of investing in expensive, specialized hardware. This book assumes that you have a good amount of Cisco networking knowledge, and it will focus more on Packet Tracer rather than networking.

  16. Determination of Rn-222 in drinking water. An important parameter for the natural radioactivity exposure assessment; Bestimmung von {sup 222}Rn in Trinkwasser. Ein wichtiger Parameter fuer die Erfassung der natuerlich bedingten Strahlenbelastung

    Energy Technology Data Exchange (ETDEWEB)

    Zoiy, Myroslav [Forschungszentrum Juelich GmbH (Germany)

    2017-08-01

    The natural radiation exposure includes external exposure due to terrestric and cosmic radiation and internal exposure due to respiration and food - incorporation. Incorporated radionuclides are partially absorbed in the vascular and lymphatic systems and partially excreted after a certain biological half-time through kidneys and intestines, and partially the lungs. The radiation exposure is defined as effective annual dose in Sievert. In Germany the medium natural exposure is 2.1 mSv per year.

  17. Natural radioisotopes. The ''atomic clock'' for the age determination of rocks and archeological discoveries; Natuerliche Radioisotope. Die ''Atomuhr'' fuer die Bestimmung des absoluten Alters von Gesteinen und archaeologischen Funden

    Energy Technology Data Exchange (ETDEWEB)

    Heuel-Fabianek, Burkhard [Forschungszentrum Juelich (Germany)

    2017-04-01

    The contribution describes the fundamentals of radiometric age determination based on natural radionuclides. Organic (carbon containing) materials can be dated up to an age of 60.000 years using C-14. The methods used for radiometric dating of rocks and minerals include the radioactive decay series of U-238, U-235, Th -232, but also the beta decay of Rb-87 to Sr-87 or K-40 to Ar-40. The absolute age of rocks is not necessarily identical with the radiometric dating result, since geological processes could influence the radionuclide ratio.

  18. Tracer attenuation in groundwater

    Science.gov (United States)

    Cvetkovic, Vladimir

    2011-12-01

    The self-purifying capacity of aquifers strongly depends on the attenuation of waterborne contaminants, i.e., irreversible loss of contaminant mass on a given scale as a result of coupled transport and transformation processes. A general formulation of tracer attenuation in groundwater is presented. Basic sensitivities of attenuation to macrodispersion and retention are illustrated for a few typical retention mechanisms. Tracer recovery is suggested as an experimental proxy for attenuation. Unique experimental data of tracer recovery in crystalline rock compare favorably with the theoretical model that is based on diffusion-controlled retention. Non-Fickian hydrodynamic transport has potentially a large impact on field-scale attenuation of dissolved contaminants.

  19. Stabilisation goals for concentrations of climate-relevant gaseous emissions: Effects and emission pathways. Final report; Stabilisierungsziele fuer Treibhausgaskonzentrationen: Eine Abschaetzung der Auswirkungen und der Emissionspfade. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Onigkeit, J.; Alcamo, J.; Kaspar, F.; Roesch, T.

    2000-04-01

    beruecksichtigt. Neben einer Untersuchung der Reduktionsmassnahmen, die auf globaler Ebene notwendig sind, wurde ein Ansatz entwickelt, um die globalen Reduktionslasten auf Annex B und Nicht-Annex B Laender zu verteilen. Um ein Stabilisierungsziel von 550 ppm CO{sub 2} in der Atmosphaere zu erreichen, duerfen die jaehrlichen globalen anthropogenen CO{sub 2} aequivalenten Emissionen zwar bis 2030 leicht ansteigen, muessen aber bis 2100 auf das Emissionsniveau von 1990 zurueckkehren. Fuer das 450 ppm Ziel ist bis 2100 sogar eine Reduktion auf die Haelfte der Emissionen von 1990 notwendig. Es wurden die Konsequenzen des Klimawandels fuer die landwirtschaftliche Produktivitaet, fuer die natuerliche Vegetation, die Wasserverfuegbarkeit und das Meeresspiegelniveau untersucht. Auch die Auswirkungen regional unterschiedlicher SO{sub 2} Emissionen wurden beruecksichtigt. Trotz umfangreicher Emissionskontrollen ist fuer beide Stabilisierungsziele mit einer schnellen Zunahme der Flaeche mit zurueckgehender landwirtschaftlicher Produktivitaet und mit einer Gefaehrdung der natuerlichen Vegetation zu rechnen. Die Hoehe der Auswirkungen variiert jedoch stark von Region zu Region. (orig.)

  20. GSF-Forschungszentrum fuer Umwelt und Gesundheit, Institut fuer Hydrologie. Annual report 1995; GSF-Forschungszentrum fuer Umwelt und Gesundheit, Institut fuer Hydrologie. Jahresbericht 1995

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1996-09-01

    The 1995 annual report of the Institute of Hydrology presents the findings of 19 current research projects on different subjects in hydrology. It is supplemented by information on cooperation with other scientific institutions in the form of lists of publications and reports, lectures and posters, university teaching projects, and finished and current dissertations. (VHE) [Deutsch] Der Jahresbericht 1995 des Institutes fuer Hydrologie im GSF-Forschungszentrum fuer Umwelt und Gesundheit stellt die Ergebnisse von derzeit 19 laufenden Untersuchungen zu unterschiedlichen hydrologischen Themen vor. Ergaenzt werden die Ausfuehrungen durch einen Ueberblick ueber die Zusammenarbeit mit anderen wissenschaftlichen Institutionen in Form von Verzeichnissen der Veroeffentlichungen und Berichte, der Vortraege und Poster, der Beitraege zur Lehre an Hochschulen sowie der abgeschlossenen und laufenden Dissertationen. (VHE)

  1. Journal: Efficient Hydrologic Tracer-Test Design for Tracer ...

    Science.gov (United States)

    Hydrological tracer testing is the most reliable diagnostic technique available for the determination of basic hydraulic and geometric parameters necessary for establishing operative solute-transport processes. Tracer-test design can be difficult because of a lack of prior knowledge of the basic hydraulic and geometric parameters desired and the appropriate tracer mass to release. A new efficient hydrologic tracer-test design (EHTD) methodology has been developed to facilitate the design of tracer tests by root determination of the one-dimensional advection-dispersion equation (ADE) using a preset average tracer concentration which provides a theoretical basis for an estimate of necessary tracer mass. The method uses basic measured field parameters (e.g., discharge, distance, cross-sectional area) that are combined in functional relatipnships that descrive solute-transport processes related to flow velocity and time of travel. These initial estimates for time of travel and velocity are then applied to a hypothetical continuous stirred tank reactor (CSTR) as an analog for the hydrological-flow system to develop initial estimates for tracer concentration, tracer mass, and axial dispersion. Application of the predicted tracer mass with the hydraulic and geometric parameters in the ADE allows for an approximation of initial sample-collection time and subsequent sample-collection frequency where a maximum of 65 samples were determined to be necessary for descri

  2. Tracer tomography (in) rocks!

    Science.gov (United States)

    Somogyvári, Márk; Jalali, Mohammadreza; Jimenez Parras, Santos; Bayer, Peter

    2016-04-01

    Physical behavior of fractured aquifers is rigorously controlled by the presence of interconnected conductive fractures, as they represent the main pathways for flow and transport. Ideally, they are simulated as a discrete fracture network (DFN) in a model to capture the role of fracture system geometry, i.e. fracture length, height, and width (aperture/transmissivity). Such network may be constrained by prior geological information or direct data resources such as field mapping, borehole logging and geophysics. With the many geometric features, however, calibration of a DFN to measured data is challenging. This is especially the case when spatial properties of a fracture network need to be calibrated to flow and transport data. One way to increase the insight in a fractured rock is by combining the information from multiple field tests. In this study, a tomographic configuration that combines multiple tracer tests is suggested. These tests are conducted from a borehole with different injection levels that act as sources. In a downgradient borehole, the tracer is recorded at different levels or receivers, in order to maximize insight in the spatial heterogeneity of the rock. As tracer here we chose heat, and temperature breakthrough curves are recorded. The recorded tracer data is inverted using a novel stochastic trans-dimensional Markov Chain Monte Carlo procedure. An initial DFN solution is generated and sequentially modified given available geological information, such as expected fracture density, orientation, length distribution, spacing and persistency. During this sequential modification, the DFN evolves in a trans-dimensional inversion space through adding and/or deleting fracture segments. This stochastic inversion algorithm requires a large number of thousands of model runs to converge, and thus using a fast and robust forward model is essential to keep the calculation efficient. To reach this goal, an upwind coupled finite difference method is employed

  3. Bayerisches Landesamt fuer Umweltschutz. Annual report 1999; Bayerisches Landesamt fuer Umweltschutz. Taetigkeitsbericht 1999

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2000-07-01

    The annual report informs about the activities of the Bavarian Land Office for Environmental Protection in the following fields: clean air policy, waste management, management of soil pollution and remedial action, nuclear energy and radiation protection, nature conservation and landscape conservation, LfU laboratory, environmental hygiene, and data processing (SR) [German] Der vorliegende Bericht beschreibt die Taetigkeiten des Bayerischen Landesamtes fuer Umweltschutz auf folgenden Gebieten: Immissionsschutz, Abfallwirtschaft, Altlasten und Bodenschutz, Kernenergie und Strahlenschutz, Naturschutz und Landschaftspflege, Zentrallabors und Umwelthygiene, sowie Datenverarbeitung. (SR)

  4. 50. Annual meeting of the Deutsche Gesellschaft fuer Neuroradiologie. Abstracts; 50. Jahrestagung der Deutschen Gesellschaft fuer Neuroradiologie. Abstracts

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2015-09-15

    The volume on the 50th annual meeting of the Deutsche Gesellschaft fuer Neuroradiologie includes the abstracts concerning the following issues: infectious central nervous system diseases, neurodegenerations, infarction, petrosal bone pathology, neurointerventions.

  5. 49. Annual meeting of the Deutsche Gesellschaft fuer Neuroradiologie. Abstracts; 49. Jahrestagung der Deutschen Gesellschaft fuer Neuroradiologie. Abstracts

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2014-10-15

    The conference proceedings of the 48. Annual meeting of the Deutsche Gesellschaft fuer Neuroradiologie contain abstracts on the following issues: neuro-oncological imaging, multimodal imaging concepts, subcranial imaging, spinal codes, interventional neuroradiology.

  6. Development of radioisotope tracer technology

    Energy Technology Data Exchange (ETDEWEB)

    Jin, Joon Ha; Lee, Myun Joo; Jung, Sung Hee; Park, Soon Chul; Lim, Dong Soon; Kim, Jae Ho; Lee, Jae Choon; Lee, Doo Sung; Cho, Yong Suk; Shin, Sung Kuan

    2000-04-01

    The purpose of this study is to develop the radioisotope tracer technology, which can be used in solving industrial and environmental problems and to build a strong tracer group to support the local industries. In relation to the tracer technology in 1999, experiments to estimate the efficiencies of a sludge digester of a waste water treatment plant and a submerged biological reactor of a dye industry were conducted. As a result, the tracer technology for optimization of facilities related to wastewater treatment has been developed and is believed to contribute to improve their operation efficiency. The quantification of the experimental result was attempted to improve the confidence of tracer technology by ECRIN program which basically uses the MCNP simulation principle. Using thin layer activation technique, wear of tappet shim was estimated. Thin layer surface of a tappet shim was irradiated by proton beam and the correlation between the measured activity loss and the amount of wear was established. The equipment was developed to adjust the energy of proton which collides with the surface of tappet. The tracer project team has participated into the tracer test for estimating the efficiency of RFCC system in SK cooperation. From the experiment the tracer team has obtained the primary elements to be considered for judging the efficiency of RFCC unit. By developing the tracer techniques to test huge industrial units like RFCC, the tracer team will be able to support the local industries that require technical services to solve any urgent trouble. (author)

  7. Chemical Tracer Methods: Chapter 7

    Science.gov (United States)

    Healy, Richard W.

    2017-01-01

    Tracers have a wide variety of uses in hydrologic studies: providing quantitative or qualitative estimates of recharge, identifying sources of recharge, providing information on velocities and travel times of water movement, assessing the importance of preferential flow paths, providing information on hydrodynamic dispersion, and providing data for calibration of water flow and solute-transport models (Walker, 1998; Cook and Herczeg, 2000; Scanlon et al., 2002b). Tracers generally are ions, isotopes, or gases that move with water and that can be detected in the atmosphere, in surface waters, and in the subsurface. Heat also is transported by water; therefore, temperatures can be used to trace water movement. This chapter focuses on the use of chemical and isotopic tracers in the subsurface to estimate recharge. Tracer use in surface-water studies to determine groundwater discharge to streams is addressed in Chapter 4; the use of temperature as a tracer is described in Chapter 8.Following the nomenclature of Scanlon et al. (2002b), tracers are grouped into three categories: natural environmental tracers, historical tracers, and applied tracers. Natural environmental tracers are those that are transported to or created within the atmosphere under natural processes; these tracers are carried to the Earth’s surface as wet or dry atmospheric deposition. The most commonly used natural environmental tracer is chloride (Cl) (Allison and Hughes, 1978). Ocean water, through the process of evaporation, is the primary source of atmospheric Cl. Other tracers in this category include chlorine-36 (36Cl) and tritium (3H); these two isotopes are produced naturally in the Earth’s atmosphere; however, there are additional anthropogenic sources of them.

  8. Thermodynamics for engineers; Thermodynamik fuer Ingenieure

    Energy Technology Data Exchange (ETDEWEB)

    Langeheinecke, K. [Fachhochschule Ravensburg-Weingarten, Weingarten (Germany); Jany, P. [Fachhochschule Konstanz (Germany); Sapper, E. [Fachhochschule Konstanz (Germany)

    1993-12-31

    Technical thermodynamics is part of the basics of engineering. This book lays the foundation needed to understand the real thermal processes. Extensive explanations with a large number of diagrams, examples, problems and exercises illustrate the theory, philosophy, methods and tools of thermodynamics and make this book a valuable instrument of self-study. Extensive and sound explanation of technical terminology. (orig./IHL). 291 figs., 59 tabs. [Deutsch] Die Technische Thermodynamik gehoert zur Basis der Ingenieurwissenschaften. Daher vermittelt das Buch die Grundlagen fuer das Verstehen der realen thermischen Prozesse. Ausfuehrliche Texte mit vielen bildlichen Darstellungen, durchgerechnete Beispiele, zahlreiche Fragen und Uebungen verdeutlichen die Aussagen, Denkweisen, Methoden und Werkzeuge der Thermodynamik und empfehlen dieses Buch besonders zum Selbststudium. Besonderer Wert wird auf die Vermittlung der Fachsprache gelegt. (orig./IHL)

  9. Radon as geological tracer

    Energy Technology Data Exchange (ETDEWEB)

    Lacerda, T.; Anjos, R.M. [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil). Inst. de Fisica; Valladares, D.L.; Rizzotto, M.; Velasco, H.; Ayub, J. Juri [Universidad Nacional de San Luis (Argentina). Inst. de Matematica Aplicada San Luis (IMASL); Silva, A.A.R. da; Yoshimura, E.M. [Universidade de Sao Paulo (IF/USP), SP (Brazil). Inst. de Fisica

    2012-07-01

    Full text: This work presents measurements of {sup 222}Rn levels performed in La Carolina gold mine and Los Condores tungsten mine at the province of San Luis, Argentina, today used for tourist visitation, and can evaluate the potential use of such radioactive noble gas as tracer or marker for geological processes in underground environments. By concentrations of {sup 40}K, {sup 232}Th and {sup 23}'8U were also measured in the walls of tunnels were determined the rocks mineral composition, what indicated that the mines have the same composition. In this sense, we used nuclear trace plastic detectors CR-39, gamma spectrometry of rock samples and Geiger-Muller (GM) monitors The patterns of radon gas transportation processes revealed that La Carolina could be interpreted through a model based on a radioactive gas confined into a single entrance tube, with constant cross section and air velocity. Los Condores, which has a second main entrance, could be interpreted through a model based on a radioactive gas confined into a two entrance tube, allowing a chimney effect for air circulation. The results showed the high potential of using {sup 222}Rn as a geological tracer. In what concerns the occupational hazard, in summer (time of more intense tourist activity in the mine) La Carolina presented a mean concentration of the radioactive noble gas that exceeds in four times the action level of 1,5 kBq m{sup -3} recommended by the International Commission of Radiological Protection (ICRP). The chimney effect shows the low mean concentration of radon in Los Condores. (author)

  10. Bayerisches Landesamt fuer Umweltschutz. Annual report 2004; Bayerisches Landesamt fuer Umweltschutz. Jahresbericht 2004

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2005-07-01

    Subjects: Central services; Air pollution abatement; Noise and vibration protection; Protection against non-ionising radiation; Waste management, land pollution and soil protection; Nuclear power and radiation protection; Conservation and landscaping; Central technical issues. The tasks of the Landesamt are illustrated by practical examples. [German] Das bayerische Landesamt fuer Umweltschutz stellt in seinem Jahresbericht die Aufgabenschwerpunkte und Taetigkeitwsfelder dar. Der Bericht gliedert sich in die Bereiche: Zentrale Dienste; Luftreinhaltung; Laerm- und Erschuetterungsschutz, Schutz vor nichtionisierender Strahlung; Abfallwirtschaft, Altlasten und Bodenschutz; Kernenergie und Strahlenschutz; Naturschutz und Landschaftspflege; Zentrale Fachaufgaben. Dabei werden anhand von konkreten Beispielen die Aufgaben des Landesamtes erlaeutert. (uke)

  11. Exotic tracers for atmospheric studies

    Energy Technology Data Exchange (ETDEWEB)

    Lovelock, J.E. (Brazzos Ltd., Launceston (UK)); Ferber, G.J. (National Oceanic and Atmospheric Administration, Silver Spring, MD (USA). Air Resources Lab.)

    1982-01-01

    Tracer materials can be injected into the atmosphere to study transport and dispersion processes and to validate air pollution model calculations. Tracers should be inert, non-toxic and harmless to the environment. Tracers for long-range experiments, where dilution is very great, must be measurable at extremely low concentrations, well below the parts per trillion level. Compounds suitable for long-range tracer work are rare and efforts should be made to reserve them for meteorological studies, barring them from commercial uses which would increase atmospheric background concentrations. The use of these exotic tracers, including certain perfluorocarbons and isotopically labelled methanes, should be coordinated within the meteorological community to minimize interferences and maximise research benefits.

  12. Exotic tracers for atmospheric studies

    Science.gov (United States)

    Lovelock, James E.; Ferber, Gilbert J.

    Tracer materials can be injected into the atmosphere to study transport and dispersion processes and to validate air pollution model calculations. Tracers should be inert, non-toxic and harmless to the environment. Tracers for long-range experiments, where dilution is very great, must be measurable at extremely low concentrations, well below the parts per trillion level. Compounds suitable for long-range tracer work are rare and efforts should be made to reserve them for meteorological studies, barring them from commercial uses which would increase atmospheric background concentrations. The use of these exotic tracers, including certain perfluorocarbons and isotopically labelled methanes, should be coordinated within the meteorological community to minimize interferences and maximize research benefits.

  13. Natural climate variations in historical times up to 10.000 years ago. Final report; Natuerliche Klimavariationen in historischen Zeiten bis 10.000 Jahre vor heute. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Mayr, C.; Graf, W.; Stichler, W.; Trimborn, P.

    2001-07-01

    {delta}{sup 13}C resp. from 6,470 BC for {delta}{sup 2}H to AD 905, with a five-year resolution. The variations of {delta}{sup 2}H were interpreted as isotope signals of precipitation while the variations of {delta}{sup 13}C were seen as resulting from the availability of water to the trees. (orig.) [German] Die Arbeit befasst sich mit der klimatischen Aussagekraft der {sup 2}H- und {sup 13}C-Gehalte von Baum-Jahrringen und von Pflanzenmaterial allgemein. In Klimakammerexperimenten wurde der Einfluss von Variationen der Lufttemperatur, relativen Luftfeuchtigkeit und der Wasserverfuegbarkeit auf die Verhaeltnise der stabilen Isotope von drei verschiedenen C{sub 3}-Pflanzenarten (Brassica oleracea, Eucalyptus globulus, Vicia faba) untersucht. Die Ergebnisse zeigten, dass die {delta}{sup 2}H-Werte der Pflanzenstaengel vor allem vom Isotopenverhaeltnis des aufgenommenen Wassers abhingen, sowie von der {sup 2}H-Anreicherung des Blattwassers, die wiederum von der relativen Luftfeuchtigkeit der Umgebungsluft beeinflusst wurde. Die {sup 13}C-Gehalte der Pflanzenstaengel hingegen wurden durch alle drei Parameter beeinflusst und waren sowohl mit der relativen Luftfeuchtigkeit, als auch mit der Temperatur negativ korreliert. Es konnte gezeigt werden, dass auch der Bewaesserungsstatus auf die {sup 13}C-Diskriminierung der Pflanzen einen grossen Einfluss hatte. Hoehere Wasserverfuegbarkeit fuehrte zu niedrigeren {sup 13}C-Gehalten. Die Ergebnisse der Isotopenanalysen konnten durch Gaswechselmessungen untermauert werden. Weiterhin wurden Kalibrierungsstudien mit {delta}{sup 2}H- und {delta}{sup 13}C-Zeitreihen sueddeutscher Fichten (Picea abies) an zwei Standorten (Schussbach, Klosterreichenbach) durchgefuehrt. Es werden methodische Ansaetze fuer die Erstellung von langen Isotopenreihen aus Jahrringen subfossiler Eichen aufgezeigt. Die Untersuchungen am subfossilen Holz beruecksichtigen die verschiedenen Bestandteile der Jahrringe (Spaetholz, Fruehholz) und unterschiedlich

  14. Proceedings of the atmospheric tracers and tracer application workshop

    Energy Technology Data Exchange (ETDEWEB)

    Barr, S.; Gedayloo, T. (comps.)

    1979-12-01

    In addition to presentations by participating members a general discussion was held in order to summarize and outline the goals and objectives of the workshop. A number of new low level background tracers such as heavy methanes, perfluorocarbons, multiply labeled isotopes such as /sup 13/C/sup 18/O/sub 2/, helium 3, in addition to sample collection techniques and analytical methods for various tracers were discussed. This report is a summary of discussions and papers presented at this workshop.

  15. Driven tracers in narrow channels

    Science.gov (United States)

    Cividini, J.; Mukamel, D.; Posch, H. A.

    2017-01-01

    Steady-state properties of a driven tracer moving in a narrow two-dimensional (2D) channel of quiescent medium are studied. The tracer drives the system out of equilibrium, perturbs the density and pressure fields, and gives the bath particles a nonzero average velocity, creating a current in the channel. Three models in which the confining effect of the channel is probed are analyzed and compared in this study: the first is the simple symmetric exclusion process (SSEP), for which the stationary density profile and the pressure on the walls in the frame of the tracer are computed. We show that the tracer acts like a dipolar source in an average velocity field. The spatial structure of this 2D strip is then simplified to a one-dimensional (1D) SSEP, in which exchanges of position between the tracer and the bath particles are allowed. Using a combination of mean-field theory and exact solution in the limit where no exchange is allowed gives good predictions of the velocity of the tracer and the density field. Finally, we show that results obtained for the 1D SSEP with exchanges also apply to a gas of overdamped hard disks in a narrow channel. The correspondence between the parameters of the SSEP and of the gas of hard disks is systematic and follows from simple intuitive arguments. Our analytical results are checked numerically.

  16. Clean air litigation; Klagen fuer Saubere Luft

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2016-11-11

    The pollution of air by nitrogen dioxide (NO{sub 2}) in cities is one of the central challenges of air pollution in Germany, in addition to the pollution of particulate matter (PM10). In cooperation with the British non-governmental organization ClientEarth, the German Environmental Aid (DUH) filed a lawsuit in November 2015 for exceeding air quality limits for NO{sub 2}. The cities of Stuttgart, Frankfurt, Duesseldorf, Essen, Gelsenkirchen, Aachen, Cologne and Bonn are affected. Here, citizens are constantly exposed to high air pollution. Because of the excess of the NO{sub 2} limits at all traffic-related measuring stations in Berlin, the DUH initiated legal steps and filed a lawsuit too in June 2016. With the lawsuits, DUH wants to promote the implementation of measures to reduce NO{sub 2} in Germany. [German] Die Belastung der Luft durch Stickstoffdioxid (NO{sub 2}) in Staedten ist neben der Belastung durch Feinstaub (PM10) eine der zentralen Herausforderungen der Luftreinhaltung in Deutschland. In Zusammenarbeit mit der britischen Nichtregierungsorganisation ClientEarth legte die Deutsche Umwelthilfe (DUH) im November 2015 Klage wegen Ueberschreitung der Luftqualitaetsgrenzwerte fuer NO{sub 2}ein. Betroffen sind die Staedte Stuttgart, Frankfurt, Duesseldorf, Essen, Gelsenkirchen, Aachen, Koeln und Bonn. Hier sind Buergerinnen und Buerger anhaltend zu hoher Luftverschmutzung ausgesetzt. Wegen Ueberschreitung der NO{sub 2}-Grenzwerte an allen verkehrsnahen Messstationen in Berlin hat die DUH im Juni 2016 auch hier rechtliche Schritte eingeleitet und Klage eingereicht. Mit den Klagen will die DUH die Umsetzung von Massnahmen zur NO{sub 2}-Reduktion in Deutschland voranbringen.

  17. Tracer Diffusion in a Soft Glassy Material

    Science.gov (United States)

    Petit, Laure; Barentin, Catherine; Colombani, Jean; Ybert, Christophe; Barrat, Jean-Louis; Bocquet, Lydéric

    2008-07-01

    We have carried out Fluorescence Recovery After Photobleaching measurements of the diffusion of tracers of various sizes in a colloidal glass (a Laponite suspension). We have shown that the diffusion is only dependent on the ratio of the tracer size and the distance between Laponite disks. This suggests that the tracer diffusion hindrance in the glass stems from the hydrodynamical interactions between the tracer and the Laponite network, the physico-chemical Laponite-tracer interaction playing a negligible role.

  18. Polyethyleneimine as tracer for electron microscopy

    NARCIS (Netherlands)

    Schurer, Jacob Willem

    1980-01-01

    In this thesis the development of a tracer particle for use in electron microscopy is described. Attempts were made to use this tracer particle in immuno-electron microscopy and to trace negatively charged tissue components. ... Zie: Summary

  19. Air management system for automotive fuel cells; Luftversorgungssystem fuer Fahrzeugbrennstoffzellen

    Energy Technology Data Exchange (ETDEWEB)

    Kauder, K.; Temming, J. [Dortmund Univ. (Germany). Fachgebiet Fluidenergiemaschinen

    2001-07-01

    Fuel cells have attained a predominant position in the development of alternative automotive drives during the last few years. The Polymer Electrolyte Membrane Fuel Cell (PEMFC), preferred for automotive applications, requires compressed air for maximum efficiency. In most prototypes this is provided by twin-screw compressors. The article introduces the different types of fuel cells, and the system and requirements of mobile applications of fuel cells. The advantages and development potential of screw compressors are described. Furthermore concepts of a compressor-expander module based on screw machines are presented and discussed. (orig.) [German] Bei der Entwicklung alternativer Fahrzeugantriebe hat die Brennstoffzelle in den letzten Jahren eine vorherrschende Stellung eingenommen. Die Polymer-Elektrolyt-Membran Brennstoffzelle, PEMFC, die fuer automotive Anwendungen bevorzugt verwendet wird, benoetigt fuer einen optimalen Wirkungsgrad eine Druckluftversorgung. Als Compressor kommt derzeit insbesondere der Schraubenlader bzw. -compressor in verschiedenen Prototypenfahrzeugen zum Einsatz. Der Beitrag behandelt zunaechst die unterschiedlichen Brennstoffzellentypen, den Systemaufbau und die Anforderungen an die mobile Anwendung der Brennstoffzelle. Fuer diesen speziellen Anwendungsfall werden Vorteile und Entwicklungsmoeglichkeiten der Schraubenmaschine dargelegt. Davon ausgehend finden sich Konzepte zum Aufbau eines Compressor-Expander-Moduls (CEM) auf Basis der Schraubenmaschinen. (orig.)

  20. Bayerisches Landesamt fuer Umweltschutz. 1997 annual report and abstracts of publications; Bayerisches Landesamt fuer Umweltschutz. Taetigkeitsbericht 1997 und Kurzbeitraege

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1998-08-01

    The annual report informs about the activities of the Bavarian Land Office for Environmental Protection in the following fields: clean air policy, waste management, management of soil pollution and remedial action, nuclear energy and radiation protection, nature conservation and landscape conservation, LfU laboratory, environmental hygiene, and data processing (SR) [Deutsch] Der vorliegende Bericht beschreibt die Taetigkeiten des Bayerischen Landesamtes fuer Umweltschutz auf folgenden Gebieten: Immissionsschutz, Abfallwirtschaft, Altlasten und Bodenschutz, Kernenergie und Strahlenschutz, Naturschutz und Landschaftspflege, Zentrallabors und Umwelthygiene, sowie Datenverarbeitung. (SR)

  1. Tracer-tracer relations as a tool for research on polar ozone loss

    Energy Technology Data Exchange (ETDEWEB)

    Mueller, Rolf

    2010-07-01

    The report includes the following chapters: (1) Introduction: ozone in the atmosphere, anthropogenic influence on the ozone layer, polar stratospheric ozone loss; (2) Tracer-tracer relations in the stratosphere: tracer-tracer relations as a tool in atmospheric research; impact of cosmic-ray-induced heterogeneous chemistry on polar ozone; (3) quantifying polar ozone loss from ozone-tracer relations: principles of tracer-tracer correlation techniques; reference ozone-tracer relations in the early polar vortex; impact of mixing on ozone-tracer relations in the polar vortex; impact of mesospheric intrusions on ozone-tracer relations in the stratospheric polar vortex calculation of chemical ozone loss in the arctic in March 2003 based on ILAS-II measurements; (4) epilogue.

  2. Tracer diffusion inside fibrinogen layers

    Science.gov (United States)

    Cieśla, Michał; Gudowska-Nowak, Ewa; Sagués, Francesc; Sokolov, Igor M.

    2014-01-01

    We investigate the obstructed motion of tracer (test) particles in crowded environments by carrying simulations of two-dimensional Gaussian random walk in model fibrinogen monolayers of different orientational ordering. The fibrinogen molecules are significantly anisotropic and therefore they can form structures where orientational ordering, similar to the one observed in nematic liquid crystals, appears. The work focuses on the dependence between level of the orientational order (degree of environmental crowding) of fibrinogen molecules inside a layer and non-Fickian character of the diffusion process of spherical tracer particles moving within the domain. It is shown that in general particles motion is subdiffusive and strongly anisotropic, and its characteristic features significantly change with the orientational order parameter, concentration of fibrinogens, and radius of a diffusing probe.

  3. Tracer diffusion inside fibrinogen layers

    CERN Document Server

    Cieśla, Michał; Sagués, Francesc; Sokolov, Igor M

    2013-01-01

    We investigate the motion of tracer (test) particles in crowded environments by carrying simulations of two-dimensional Gaussian random walk in model fibrinogen monolayers of different orientational ordering. The fibrinogen molecules are significantly anisotropic and therefore they can form structures where orientational ordering, similar to the one observed in nematic liquid crystals, appears. The work focuses on the dependence between level of the orientational order (degree of environmental crowding) of fibrinogen molecules inside a layer and non-Fickian character of the diffusion process of spherical tracer particles moving within the domain. It is shown that in general particles motion is subdiffusive and strongly anisotropic, and its characteristic features significantly change with the orientational order parameter, concentration of fibrinogens and radius of a diffusing probe.

  4. Tracer tests in geothermal resource management

    Directory of Open Access Journals (Sweden)

    Axelsson G.

    2013-05-01

    Full Text Available Geothermal reinjection involves injecting energy-depleted fluid back into geothermal systems, providing an effective mode of waste-water disposal as well as supplementary fluid recharge. Cooling of production boreholes is one of the main disadvantages associated with reinjection, however. Tracer testing is an important tool for reinjection studies because tracer tests actually have a predictive power since tracer transport is orders of magnitude faster than cold-front advancement around reinjection boreholes. A simple and efficient method of tracer test interpretation, assuming specific flow channels connecting reinjection and production boreholes, is available. It simulates tracer return profiles and estimates properties of the flow channels, which are consequently used for predicting the production borehole cooling. Numerous examples are available worldwide on the successful application of tracer tests in geothermal management, many involving the application of this interpretation technique. Tracer tests are also used for general subsurface hydrological studies in geothermal systems and for flow rate measurements in two-phase geothermal pipelines. The tracers most commonly used in geothermal applications are fluorescent dyes, chemical substances and radioactive isotopes. New temperature-resistant tracers have also been introduced and high-tech tracers are being considered.

  5. Remotely controlled underwater vehicles for inspections; Ferngesteuerte Unterwasserfahrzeuge fuer Inspektionen

    Energy Technology Data Exchange (ETDEWEB)

    Haferkamp, H.; Bach, F.W.; Reinhardt, U.; Bachmann, M. [Hannover Univ. (Germany). Inst. fuer Werkstoffkunde

    1997-10-01

    Since the seventies, unmanned remotely operated underwater vehicles have been used increasingly be offshore industries for inspection and maintenance of platforms and pipelines. The range of potential uses became wider, and the wish arose to adapt these vehicles to various different applications. For some of the commercially operated vehicles, manufacturers offer, e.g., MasterSlave manipulator arms or Sonar sensors as optional extras. On the other hand, the universally applicable modular ROV has not so far grown beyond the conceptual design stage. As ROVs are employed especially in locations where extreme environmental conditions make the work of divers uneconomical small inspection vehicles have been employed also in the flooded sections of nuclear installations. In the light of the conditions prevailing in that environment, some existing vehicles were scaled down and equipped with radiation-resistant underwater cameras. The Institute for Materials Studies of the University of Hanover developed small ROVs specifically for use in nuclear facilities, with these boundary conditions being taken into consideration: Failsafe characteristics; design allowing easy decontamination; small dimensions; high mobility for precise maneuvers in constricted spaces; low water depths not exceeding 30 m; short tooling times; reliable retrievability of the vehicle. (orig./RHM) [Deutsch] Unbemannte, fernbediente Unterwasserfahrzeuge werden seit den siebziger Jahren in wachsendem Masse in der Offshore-Industrie bei der Inspektion und Wartung von Plattformen und Pipelines eingesetzt. Da ROVs insbesondere dort eingesetzt werden, wo der Einsatz von Tauchern aufgrund der extremen Umgebungsbedingungen unwirtschaftlich ist, fanden kleinbauende Inspektionsfahrzeuge den Weg in die gefluteten Sektionen kerntechnischer Anlagen. Auf Grund der hier vorherrschenden Situation wurden z.T. bestehende Fahrzeugkonzepte verkleinert und mit strahlenresistenten Unterwasserkameras versehen. Am Institut fuer

  6. In-service leak testing of district heating systems using dissolved tracer gas. Final report; Betriebsbegleitende Lecksuche mit geloestem Tracergas in Fernwaermesystemen. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Hergarten, A.; Althaus, W. [eds.

    1997-07-31

    The feasibility of in-service leak detection with dissolved tracer gas was investigated. Helium was selected as tracer gas because of its good diffusion characteristics, selective detectability at very low concentrations, inert and unproblematic behaviour within the district heating system, and good environmental compatibility. For a systematic investigation of the influencing parameters governing practical applications, a pipeline test field comprising about 240 m of KMR district heating pipelines and 61 controllable simulation leaks was constructed, and experiments using the new method were carried out. The required helium concentration amounts to a few grams of helium per cubic metre of district heating water. The water can be charged in the water preparation or feeding stage, and commercial detectors can be used. (orig./GL) [Deutsch] Zur Entwicklung einer betriebsbegleitenden Lecksuchmethode fuer erdverlegte Rohrleitungen wurden in einem Feasbility-Test die Machbarkeit der Tracergassuche mittels geloestem Spuergas bestaetigt. Als Tracergas wurde Helium aufgrund seines guenstigen Diffusionsverhaltens, seiner selektiven Nachweisbarkeit bei kleinsten Konzentrationen, seines inerten, unproblematischen Verhaltens im Fernwaermenetz und seiner guten Umweltvertraeglichkeit ausgewaehlt. Zur systematischen Untersuchung der Einflussparameter bei der Anwendung der Methode unter praxisnahen Bedingungen wurde ein Rohrleitungsversuchsfeld mit ca. 240 m KMR-Fernwaermeleitung und 61 regelbaren Simulationsleckagen aufgebaut und die neue Lecksuchmethode eingehend experimentell getestet. Die einzustellende Heliumkonzentration im Fernwaermewasser ist mit wenigen Gramm Helium je Kubikmeter Fernwaermewasser gering. Eine Vorrichtung fuer die empfohlene Beladung des gesamten Netzwasserinhalts kann in Wasseraufbereitung oder Nachspeisung des Netzes eingebunden werden. Zur Detektion koennen, marktverfuegbare Messgeraete verwendet werden. (orig./GL)

  7. Technology for the future; Technik fuer die Zukunft

    Energy Technology Data Exchange (ETDEWEB)

    Dennenmoser, Martin; Steininger, Sebastian [Fraunhofer Institut fuer Solare Energiesysteme ISE, Freiburg im Breisgau (Germany). Electrical Energy Systems (EES)

    2013-10-15

    The presented case study by the Fraunhofer Institute ISE shows that the market for stationary electrochemical storage prices are currently too high for economical operation. In winter, a battery in Germany is not always fully loaded because of low sunlight. Therefore, the combination of a battery with a PV system at this time of year does not have enough full cycles to be economical. For more complete cycles of the year and consequently lower specific storage cost wind turbines or other power generators can be connected. Since - in contrast to lead acid batteries - there is no experience with long-term storage in lithium and redox flow batteries, this study is based on current forecasts. Compared to lithium-ion batteries, lead-acid and redox flow batteries have a lower efficiency, so that the investment costs of the battery must be lower because fewer savings can be achieved. Especially for short-term storage, the production costs must be reduced. The cost reduction potential of redox flow and lithium-ion batteries is due to the current technical state of development compared to lead acid batteries very high. This means that an economic operation in the future is possible with constant development of electricity and battery prices. [German] Die vorgestellte Fallstudie des Fraunhofer Instituts ISE zeigt, dass die Marktpreise fuer stationaere elektrochemische Speicher aktuell fuer einen wirtschaftlichen Betrieb zu hoch sind. Im Winter wird eine Batterie in Deutschland aufgrund der niedrigen Sonneneinstrahlung nicht immer komplett geladen. Daher hat die Kombination eines Speichers mit einer PV-Anlage zu dieser Jahreszeit nicht genug Vollzyklen, um wirtschaftlich zu sein. Fuer mehr Vollzyklen im Jahr und demzufolge geringere spezifische Speicherkosten koennen Windkraftanlagen oder andere Stromerzeuger angeschlossen werden. Da es- im Gegensatz zu Bleisaeure- Batterien - noch keine Erfahrung mit Langzeitspeichern im Bereich Lithium und Redox-Flow gibt, beruht diese

  8. Tracer tests in geothermal resource management

    OpenAIRE

    Axelsson G.

    2013-01-01

    Geothermal reinjection involves injecting energy-depleted fluid back into geothermal systems, providing an effective mode of waste-water disposal as well as supplementary fluid recharge. Cooling of production boreholes is one of the main disadvantages associated with reinjection, however. Tracer testing is an important tool for reinjection studies because tracer tests actually have a predictive power since tracer transport is orders of magnitude faster than cold-front advancement around reinj...

  9. Tracer-Test Planning Using the Efficient Hydrologic Tracer-Test Design (Ehtd) Program (2003)

    Science.gov (United States)

    Hydrological tracer testing is the most reliable diagnostic technique available for establishing flow trajectories and hydrologic connections and for determining basic hydraulic and geometric parameters necessary for establishing operative solute-transport processes. Tracer-test ...

  10. Bundesanstalt fuer Martialforschung und -pruefung (BAM). Annual report 2001; Bundesanstalt fuer Materialforschung und -pruefung (BAM). Jahresbericht 2001

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2001-07-01

    The volume reports the activities of the BAM, (Federal Office for Materials Research and Testing), and its departments for Analytical Chemistry/Reference Materials, Chemical Safety Engineering, Hazardous Materials Containment, Environmental Compatibility of Materials, Technology of Structural Materials, Polymers, Structural Stability and Safety, Materials Protection/Nondestructive Testing, and for Scientific-Technical Interdisciplinary Activities. (MM) [German] Der vorliegende Band berichtet ueber die Aktivitaeten der Bundesanstalt fuer Materialforschung und -pruefung und ihrer Abteilungen Analytische Chemie/Referenzmaterialien, Chemische Sicherheitstechnik, Gefahrgutumschliessungen, Umweltvertraeglichkeit von Materialien, Werkstofftechnik der Konstruktionswerkstoffe, Funktion von Polymeren, Bauwerkssicherheit, Materialschutz/Zerstoerungsfreie Pruefung und Technisch-wissenschaftliche Querschnittsfunktionen. (MM)

  11. Integral energy concepts for housing estates; Integrale Energiekonzepte fuer Wohnsiedlungen

    Energy Technology Data Exchange (ETDEWEB)

    Fisch, M.N.; Kuehl, L. [Technische Univ. Braunschweig (Germany)

    1998-06-01

    Integral energy concepts for housing estates require an early cooperation between architects, planners, and specialist engineers on the basis of a holistic planning approach. This is how future-oriented, sustainable concepts evolve which do justice to the multifarious requirements on the integral energy system of a housing estate. The present paper elucidates different approaches to optimising the energy efficiency of buildings such as the implementation of low-energy house concepts, building site and architectural planning, and detailed planning of heat insulation concepts, ventilation and air tightness concepts, and adapted heating systems. The solarisation of development plans has an influence on the arrangement of buildings, which are now planned to give the greatest possible passive and active solar energy gains. The authors also describe solar-assisted district heating systems for housing estates. [Deutsch] Integrale Energiekonzepte fuer Wohnsiedlungen erfordern die fruehe Zusammenarbeit von Architekten, Planern und Fachingenieuren im Rahmen einer ganzheitlichen Planung. So entstehen zukunftsweisende und tragfaehige Konzepte, die den vielschichtigen Anforderungen des Gesamtenergiesystems ``Wohnsiedlung`` gerecht werden. Im Folgenden wird die energetische Optimierung von Gebaeuden wie die Umsetzung von Niedrigenergiehaus-Konzepten, Standort und Gebaeudeplanung sowie Detailplanung in Bezug auf das Waermedaemmkonzept, Lueftungs-/Dichtheitskonzept und auf angepasste Waermeversorgungssysteme erl autert. Die Solarisierung von Bebauungsplaenen beeinflusste Anordnung der Gebaeude hinsichtlich der Nutzung passivsolarer Gewinne sowie des Einsatzes von Systemen der aktiven Solarenergienutzung. Solarunterstuetzte Nahwaermenetze fuer Wohnsiedlungen werden ebenfalls beschrieben.

  12. Regenerative blowers for higher pressure ratios; Seitenkanalverdichter fuer erhoehte Druckverhaeltnisse

    Energy Technology Data Exchange (ETDEWEB)

    Surek, D. [Fachhochschule Merseburg (Germany). Fachbereich Maschinenbau

    1997-10-01

    Up to now regnerative blowers are built and used only for low pressure ratios in the working range of {pi}=1.10 to 1.30 despite of their high pressure coefficients. The small outer dimensions are their essential advantage compared to other flow machines but they are mostly used with low peripheral speed. The reachable stage pressure ratio can be increased by rising the peripheral speed but the expansion flow on the block has to be considered. With regard to the expansion flow on the block two pressure ranges on the block result. The undercritical and the supercritical range of the expansion flow on the block have to be taken into consideration when designing such machines. With a multistage realization of regenerative blowers higher pressure ratios up to {pi}>2.0 are within reach. (orig.) [Deutsch] Bisher werden Seitenkanalverdichter trotz ihrer grossen Druckzahlen nur fuer geringe Druckverhaeltnisse im Auslegungsbereich von {pi}=1,10 bis 1,30 gebaut und betrieben. Ihr wesentlicher Vorteil liegt in den geringen Bauabmessungen im Vergleich zu anderen Stroemungsmaschinen, wobei sie vorwiegend mit geringen Umfangsgeschwindigkeiten betrieben werden. Durch Erhoehung der Umfangsgeschwindigkeit kann das erreichbare Stufendruckverhaeltnis betraechtlich gesteigert werden, wobei aber die Expansionsstroemung im Unterbrecher zu beruecksichtigen ist. Unter Beachtung der Expansionsstroemung im Unterbrecher ergeben sich zwei Druckbereiche fuer die Expansionsstroemung im Unterbrecher. Der unterkritische und der ueberkritische Bereich der Expansionsstroemung im Unterbrecher sind bei der konstruktiven Gestaltung der Maschinen zu beachten. Mit einer mehrstufigen Ausfuehrung von Seitenkanalverdichtern sind hoehere Druckverhaeltnisse bis {pi}>2,0 erreichbar. (orig.)

  13. Tracers for Characterizing Enhanced Geothermal Systems

    Energy Technology Data Exchange (ETDEWEB)

    Karen Wright; George Redden; Carl D. Palmer; Harry Rollins; Mark Stone; Mason Harrup; Laurence C. Hull

    2010-02-01

    Information about the times of thermal breakthrough and subsequent rates of thermal drawdown in enhanced geothermal systems (EGS) is necessary for reservoir management, designing fracture stimulation and well drilling programs, and forecasting economic return. Thermal breakthrough in heterogeneous porous media can be estimated using conservative tracers and assumptions about heat transfer rates; however, tracers that undergo temperature-dependent changes can provide more detailed information about the thermal profile along the flow path through the reservoir. To be effectively applied, the thermal reaction rates of such temperature sensitive traces must be well characterized for the range of conditions that exist in geothermal systems. Reactive tracers proposed in the literature include benzoic and carboxylic acids (Adams) and organic esters and amides (Robinson et al.); however, the practical temperature range over which these tracers can be applied (100-275°C) is somewhat limited. Further, for organic esters and amides, little is known about their sorption to the reservoir matrix and how such reactions impact data interpretation. Another approach involves tracers where the reference condition is internal to the tracer itself. Two examples are: 1) racemization of polymeric amino acids, and 2) mineral thermoluminescence. In these cases internal ratios of states are measured rather than extents of degradation and mass loss. Racemization of poly-L-lactic acid (for example) is temperature sensitive and therefore can be used as a temperature-recording tracer depending on the rates of racemization and stability of the amino acids. Heat-induced quenching of thermoluminescence of pre-irradiated LiF can also be used. To protect the tracers from alterations (extraneous reactions, dissolution) in geothermal environments we are encapsulating the tracers in core-shell colloidal structures that will subsequently be tested for their ability to be transported and to protect the

  14. Tracers for Characterizing Enhanced Geothermal Systems

    Energy Technology Data Exchange (ETDEWEB)

    Karen Wright; George Redden; Carl D. Palmer; Harry Rollins; Mark Stone; Mason Harrup; Laurence C. Hull

    2010-02-01

    Information about the times of thermal breakthrough and subsequent rates of thermal drawdown in enhanced geothermal systems (EGS) is necessary for reservoir management, designing fracture stimulation and well drilling programs, and forecasting economic return. Thermal breakthrough in heterogeneous porous media can be estimated using conservative tracers and assumptions about heat transfer rates; however, tracers that undergo temperature-dependent changes can provide more detailed information about the thermal profile along the flow path through the reservoir. To be effectively applied, the thermal reaction rates of such temperature sensitive traces must be well characterized for the range of conditions that exist in geothermal systems. Reactive tracers proposed in the literature include benzoic and carboxylic acids (Adams) and organic esters and amides (Robinson et al.); however, the practical temperature range over which these tracers can be applied (100-275°C) is somewhat limited. Further, for organic esters and amides, little is known about their sorption to the reservoir matrix and how such reactions impact data interpretation. Another approach involves tracers where the reference condition is internal to the tracer itself. Two examples are: 1) racemization of polymeric amino acids, and 2) mineral thermoluminescence. In these cases internal ratios of states are measured rather than extents of degradation and mass loss. Racemization of poly-L-lactic acid (for example) is temperature sensitive and therefore can be used as a temperature-recording tracer depending on the rates of racemization and stability of the amino acids. Heat-induced quenching of thermoluminescence of pre-irradiated LiF can also be used. To protect the tracers from alterations (extraneous reactions, dissolution) in geothermal environments we are encapsulating the tracers in core-shell colloidal structures that will subsequently be tested for their ability to be transported and to protect the

  15. The Accurate Particle Tracer Code

    CERN Document Server

    Wang, Yulei; Qin, Hong; Yu, Zhi

    2016-01-01

    The Accurate Particle Tracer (APT) code is designed for large-scale particle simulations on dynamical systems. Based on a large variety of advanced geometric algorithms, APT possesses long-term numerical accuracy and stability, which are critical for solving multi-scale and non-linear problems. Under the well-designed integrated and modularized framework, APT serves as a universal platform for researchers from different fields, such as plasma physics, accelerator physics, space science, fusion energy research, computational mathematics, software engineering, and high-performance computation. The APT code consists of seven main modules, including the I/O module, the initialization module, the particle pusher module, the parallelization module, the field configuration module, the external force-field module, and the extendible module. The I/O module, supported by Lua and Hdf5 projects, provides a user-friendly interface for both numerical simulation and data analysis. A series of new geometric numerical methods...

  16. Bacteriophages as surface and ground water tracers

    Directory of Open Access Journals (Sweden)

    P. Rossi

    1998-01-01

    Full Text Available Bacteriophages are increasingly used as tracers for quantitative analysis in both hydrology and hydrogeology. The biological particles are neither toxic nor pathogenic for other living organisms as they penetrate only a specific bacterial host. They have many advantages over classical fluorescent tracers and offer the additional possibility of multi-point injection for tracer tests. Several years of research make them suitable for quantitative transport analysis and flow boundary delineation in both surface and ground waters, including karst, fractured and porous media aquifers. This article presents the effective application of bacteriophages based on their use in differing Swiss hydrological environments and compares their behaviour to conventional coloured dye or salt-type tracers. In surface water and karst aquifers, bacteriophages travel at about the same speed as the typically referenced fluorescent tracers (uranine, sulphurhodamine G extra. In aquifers of interstitial porosity, however, they appear to migrate more rapidly than fluorescent tracers, albeit with a significant reduction in their numbers within the porous media. This faster travel time implies that a modified rationale is needed for defining some ground water protection area boundaries. Further developments of other bacteriophages and their documentation as tracer methods should result in an accurate and efficient tracer tool that will be a proven alternative to conventional fluorescent dyes.

  17. Bacteriophages as surface and ground water tracers

    Science.gov (United States)

    Rossi, P.; Dörfliger, N.; Kennedy, K.; Müller, I.; Aragno, M.

    Bacteriophages are increasingly used as tracers for quantitative analysis in both hydrology and hydrogeology. The biological particles are neither toxic nor pathogenic for other living organisms as they penetrate only a specific bacterial host. They have many advantages over classical fluorescent tracers and offer the additional possibility of multi-point injection for tracer tests. Several years of research make them suitable for quantitative transport analysis and flow boundary delineation in both surface and ground waters, including karst, fractured and porous media aquifers. This article presents the effective application of bacteriophages based on their use in differing Swiss hydrological environments and compares their behaviour to conventional coloured dye or salt-type tracers. In surface water and karst aquifers, bacteriophages travel at about the same speed as the typically referenced fluorescent tracers (uranine, sulphurhodamine G extra). In aquifers of interstitial porosity, however, they appear to migrate more rapidly than fluorescent tracers, albeit with a significant reduction in their numbers within the porous media. This faster travel time implies that a modified rationale is needed for defining some ground water protection area boundaries. Further developments of other bacteriophages and their documentation as tracer methods should result in an accurate and efficient tracer tool that will be a proven alternative to conventional fluorescent dyes.

  18. The Copenhagen tracer experiments: Reporting of measurements

    DEFF Research Database (Denmark)

    Gryning, Sven-Erik; Lyck, E.

    2002-01-01

    buoyancy from a tower at a height of 115 meters and then collected 2-3 meters above ground-level at positions in up to three crosswind arcs of tracer sampling units, positioned 2-6 km from the point of release. Three consecutive 20 min averaged tracer concentrations were measured, allowing for a total...

  19. Globalisation: the driving force of growth and prosperity; Globalisierung: Triebkraft fuer Wachstum und Wohlstand

    Energy Technology Data Exchange (ETDEWEB)

    Weizsaecker, C.C. von [Energiewirtschaftliches Inst. an der Univ. zu Koeln (Germany)

    2000-08-01

    Growth is an essential prerequisite of any policy aimed at overcoming poverty and preparing the way to prosperity. A globalisation of the economy embracing the developing countries will be the most promising strategy. (orig./CB) [German] Wachstum ist eine der wichtigsten Voraussetzungen fuer die Ueberwindung der Armut und fuer die Schaffung von Wohlstand. Globalisierung mit Integration der armen Laender in die Weltwirtschaft bietet hierzu die beste Chance. (orig.)

  20. Priority to hygiene. Langenselbold dialysis center; Prioritaet fuer Hygiene. Dialysezentrum in Langenselbold

    Energy Technology Data Exchange (ETDEWEB)

    Fonfara, H. [Kermi GmbH, Plattling (Germany)

    2001-07-01

    A new dialysis center was opened in January 2000 at Langenselbold, Hessen. It is owned and operated by KfH Kuratorium fuer Dialyse und Nierentransplantation e.V. and offers modern medical treatment to patients suffering from renal diseases. [German] Ein neues Dialysezentrum wurde im Januar 2000 im hessischen Langenselbold eroeffent. Das KfH Kuratium fuer Dialyse und Nierentransplantation e.V. ist Bauherr und Betreiber des Zentrums. Hier koennen Nierenkranke in Wohnortnaehe mit modernen medizinischen Methoden behandelt werden. (orig.)

  1. Effect of tracer buoyancy on tracer experiments conducted in fractured crystalline bedrock

    Science.gov (United States)

    Becker, Matthew W.

    2003-02-01

    Tracer buoyancy has been shown to influence breakthrough from two-well tracer experiments conducted in porous media. Two-well tracer experiments are presented from fractured crystalline bedrock, in which the specific gravity of the tracer injectate varied from 1.0002 to 1.0133. Under the forced hydraulic conditions imposed, no difference in breakthrough was noted for the three experiments. These results show that even relatively dense tracer injectate solutions may have an insignificant effect on breakthrough when imposed gradients are sufficiently large.

  2. The Art of Tomographic Tracer Tests

    Science.gov (United States)

    Cirpka, O. A.; Leven, C.; Doro, K. O.; Sanchez-Leon, E. E.

    2015-12-01

    In tracer tomography several tracer tests are performed within an aquifer and breakthrough curves are observed at multiple observation points. In the analysis, hydraulic conductivity is estimated as spatially variable, 3-D field subject to some smoothness constraint. Coupled flow and transport models using this conductivity fields are requested to meet observed tracer data. The approach can be combined with hydraulic tomography.We have performed hydraulic-tomography and tracer-tomography tests using heat and fluorescein as tracers at a field site close to Tübingen, Germany. The aquifer consists of 8-9m alluvials sands and gravels overlain by 1-2m alluvial fines. The hydraulic setup consists of a forced flow field between an injection/extraction well couple, embedded in the forced flow field of another well couple. By turning injection to extraction wells, and vice versa, two different flow fields were considered. Injection wells were separated into several sections by packers, and water was injected into each section proportional to its transmissivity. The water injected into one of the sections contained the tracer. Multi-level observation wells were equiped with thermometers (for heat-tracer tests), on-line fluoremeters (for teh dye tracers), and pressure transducers. Processing of the breakthrough curves included data cleaning, non-parametric deconvolution, and calculation of temperal moments of the estimated transfer functions.The joint inversion of hydraulic-head measurements and temporal moments of heat-tracer transfer functions was done by the quasi-linear geostatistical approach on a computing cluster. As alternative, we directly invert the time series (without temporal moments) by Ensemble-Kalman filtering.The high diffusion coefficient of temperature diminishes the penetration of the heat-tracer into the aquifer, which can partially be compensated by reverting the flow field and repeating the tracer tests. In tests with fluorscent tracers the signal

  3. Software for welding - challenge and chance for engineers; Schweisstechnische Software - Herausforderung und Chance fuer den Ingenieur

    Energy Technology Data Exchange (ETDEWEB)

    Greitmann, M.J. [Stuttgart Univ. (Germany). Staatliche Materialpruefungsanstalt

    2000-07-01

    More than 100 different software products for welding are now available on the worldwide market. New systems mainly in the field of process control and numerical process simulation are under development. The German Welding Association founded service center for users of welding software. This paper informs about different applications of welding software for industrial customers, software for science, research work and teaching. (orig.) [German] Die Fuegeverfahren lassen sich neben den mechanischen Fuegetechniken (Durchsetzfuegen, Stanznieten u.a.) in die stoffschluessigen Fuegeverfahren (Kleben, Loeten und Schweissen) einteilen. Fuer die industrielle Fertigung sind dabei die schweisstechnischen Fertigungsverfahren von besonderer wirtschaftlicher Bedeutung. Vor diesem Hintergrund wird im weiteren das Potential innovativer Softwareprodukte fuer die Schweisstechnik naeher eingegangen. Dabei sollen unter 'schweisstechnischer Software' all die Softwareprodukte verstanden werden, die sich mit Schweisstechnik befassen. Voraussetzung fuer die stetig wachsende Anzahl an schweisstechnischen Softwareprodukten ist die zwischenzeitlich verfuegbare Leitungsfaehigkeit im Bereich der Hard- und Software mit ausreichenden Mengen an verlaesslichen Eingangsdaten fuer die jeweiligen Programme. Dies fuehrte dazu, dass auch komplexe Simulationsaufgaben und enorme Datenmengen fuer eine Reihe von Aufgaben auf Workstation- oder PC-Plattformen realisiert werden koennen und damit auch fuer kleinere und mittlere Unternehmensgroessen interessant sind. (orig.)

  4. Refrigerants and heat carrier fluids on a betain basis. A natural solution for preventing environmental, toxicity and corrosion problems in heating and cooling systems; Kaelte- und Waermetraeger auf Betain-Basis. Natuerliche Loesung fuer Umwelt-, Toxizitaets- und Korrosionsprobleme in Heiz- und Kuehlsystemen

    Energy Technology Data Exchange (ETDEWEB)

    Willems, B.P.M.; Jokinen, J.

    2004-05-01

    Toxic liquids and environmental hazards in buildings and industrial plants are accepted less than ever today. So far, technical problems prevented substitution of glycol-based heat carrier fluids by brines or vegetable oils. A new refrigerant on the basis of betain has overcome these problems. (orig.) [German] Fluessigkeitstoxizitaet und Umweltrisiken in Gebaeuden und Industrieanlagen werden immer weniger akzeptiert. Der Ersatz Glykol-basierter Waermetraeger durch Fluessigkeiten auf Salz-Basis oder durch Pflanzenoel scheiterte bislang an technischen Schwierigkeiten. Ein neuerer Kaeltetraeger auf Betain-Basis hat diese Probleme ueberwunden. (orig.)

  5. Atmospheric limiting values for complex hydrocarbon-containing mixtures. Pt. 3. Fuels for combustion engines; Luftgrenzwerte fuer komplexe kohlenwasserstoffhaltige Gemische. T. 3. Kraftstoffe fuer Verbrennungsmotoren

    Energy Technology Data Exchange (ETDEWEB)

    Schwarzer, H.G. [Esso AG, Hamburg (Germany)

    1997-06-01

    The justification paper atmospheric limiting values for complex hydrocarbon-containing mixtures, part 3 - ``fuels for combustion engines`` (gasolines, diesel fuel and kerosene) is currently in preparation. This third part gives information on industrial hygiene regarding the different fuels and describes the application of atmospheric limiting values for fuels. The article offers information on industrial hygiene regarding Otto engine fuel and aviation fuel, which needs to be taken into account in discussions concerning the laying down of atmospheric limiting values. (orig./ABI) [Deutsch] Das Begruendungspapier Luftgrenzwerte fuer komplexe kohlenwasserstoffhaltige Gemische Teil 3 `Kraftstoffe fuer Verbrennungsmotoren` (Gasoline, Dieselkraftstoff und Kerosin) ist z.Z. in Vorbereitung. In diesem dritten Teil werden arbeitshygienische Informationen zu den verschiedenen Kraftstoffen gegeben und die Anwendung der Luftgrenzwerte fuer Kraftstoffe beschrieben. Im folgenden werden arbeitshygienische Informationen zu Ottokraftstoff und Avgas gegeben, die es bei den Ueberlegungen hinsichtlich der Festlegung eines Luftgrenzwertes zu beruecksichtigen gilt. (orig./ABI)

  6. Planning criteria for power distribution networks; Planungskriterien fuer Verteilungsnetze

    Energy Technology Data Exchange (ETDEWEB)

    Klockhaus, H. [RWE Energie AG, Essen (Germany)

    1997-01-01

    For decades now, power network planning has been a task that had to consider consumption growth rates of 7% and above, which corresponds to a 100% increase within a period of ten years. Hence the major task of power network planning was to achieve network expansion at lowest possible cost in response to increased demand and for ensuring reliable power supply. Other than today, it has been easier then, approx. until the early 1970s, to implement general planning decisions by way of releatively immediate action, as for instance the change in voltage levels in medium high voltage systems from 20 kV to 20 kV. As a result of the oil crisis, economizing efforts everywhere cut off the power industry from the macroeconomic growth trends. Today, electric power consumption in Germany practically remains at level. Network expansion planning activities are restricted to new installations connecting or expanding existing transmission lines to newly built areas or town districts. For some years it looked as if network planning was falling behind in importance and network operation planning coming to the foreground. Meanwhile however, new and comprehensive tasks and activities have cropped up in the power market which demand optimization and best possible achievement to the benefit of the customers and the utilities. (orig.) [Deutsch] Fuer Jahrzehnte war die Aufgabe der Netzplanung gekennzeichnet durch intensiven Zuwachs an Energieverbrauch. Bei Zuwachsraten von 7% und darueber, was einer Verdoppelung binnen zehn Jahren entsprach, war eine der vordringlichsten Aufgaben der Netzplanung die Sicherstellung eines moeglichst kostenguenstigen Netzausbaus zur Gewaehrleistung der Versorgung. Leichter als heute konnten in dieser Zeit, die bis in die 70er Jahre andauerte, Grundsatzplanungen mit eingreifenden Massnahmen umgesetzt werden, etwa die Umstellung von Spannungsstufen in Mittelspannungsenetzen, z.B. von 10 kV auf 20 kV. In den 70er Jahren begann mit den Einsparbemuehungen als Folge

  7. Using Tracer Technology to Characterize Contaminated Pipelines

    Energy Technology Data Exchange (ETDEWEB)

    Maresca, Joseph, W., Jr., Ph.D.; Bratton, Wesley, L., Ph.D., P.E.; Dickerson, Wilhelmina; Hales, Rochelle

    2005-12-30

    The Pipeline Characterization Using Tracers (PCUT) technique uses conservative and partitioning, reactive or other interactive tracers to remotely determine the amount of contaminant within a run of piping or ductwork. The PCUT system was motivated by a method that has been successfully used to characterize subsurface soil contaminants and is similar in operation to that of a gas chromatography column. By injecting a ?slug? of both conservative and partitioning tracers at one end (or section) of the piping and measuring the time history of the concentration of the tracers at the other end (or another section) of the pipe, the presence, location, and amount of contaminant within the pipe or duct can be determined. The tracers are transported along the pipe or duct by a gas flow field, typically air or nitrogen, which has a velocity that is slow enough so that the partitioning tracer has time to interact with the contaminant before the tracer slug completely passes over the contaminate region. PCUT not only identifies the presence of contamination, it also can locate the contamination along the pipeline and quantify the amount of residual. PCUT can be used in support of deactivation and decommissioning (D&D) of piping and ducts that may have been contaminated with hazardous chemicals such as chlorinated solvents, petroleum products, radioactive materials, or heavy metals, such as mercury.

  8. Tracer design for magnetic particle imaging (invited).

    Science.gov (United States)

    Ferguson, R Matthew; Khandhar, Amit P; Krishnan, Kannan M

    2012-04-01

    Magnetic particle imaging (MPI) uses safe iron oxide nanoparticle tracers to offer fundamentally new capabilities for medical imaging, in applications as vascular imaging and ultra-sensitive cancer therapeutics. MPI is perhaps the first medical imaging platform to intrinsically exploit nanoscale material properties. MPI tracers contain magnetic nanoparticles whose tunable, size-dependent magnetic properties can be optimized by selecting a particular particle size and narrow size-distribution. In this paper we present experimental MPI measurements acquired using a homemade MPI magnetometer: a zero-dimensional MPI imaging system designed to characterize tracer performance by measuring the derivative of the time-varying tracer magnetization, M'(H(t)), at a driving frequency of 25 kHz. We show that MPI performance is optimized by selecting phase-pure magnetite tracers of a particular size and narrow size distribution; in this work, tracers with 20 nm median diameter, log-normal distribution shape parameter, σ(v), equal to 0.26, and hydrodynamic diameter equal to 30 nm showed the best performance. Furthermore, these optimized MPI tracers show 4 × greater signal intensity (measured at the third harmonic) and 20% better spatial resolution compared with commercial nanoparticles developed for MRI.

  9. Parameters for viable process combinations; Randbedingungen fuer sinnvolle Verfahrenskombinationen

    Energy Technology Data Exchange (ETDEWEB)

    Lahl, U.; Zeschmar-Lahl, B. [BZL Kommunikation und Projektsteuerung GmbH, Oyten (Germany)

    1998-09-01

    The following parameters merit examination in determining the viability of process combinations: conceptual and technical soundness, environmental acceptability, energy balance, flexibility, costs, economic risk potential. The present contribution on this subject is not intended to take the place of or cover the scope of single-case studies. In practice, viability studies on process combinations have to deal with concrete plans involving precisely defined material flow balances, emissions, costs etc. The present paper therefore only presents the basic principles of this type of study. [Deutsch] Folgende Randbedingungen fuer sinnvolle Verfahrenskombinationen sind zu untersuchen: - konzeptionelle und technische Stimmigkeit, - Umweltvertraeglichkeit, - energetische Bilanz, - Flexibilitaet, - Kosten, - oekonomisches Risikopotential. Nun kann dieser Beitrag zum Thema keine Einzelfallbetrachtung ersetzen bzw. abdecken. Im Rahmen einer echten Pruefung auf `Sinnhaftigkeit` einer Kombinationsloesung stehen sich ganz konkrete Planungen gegenueber, die wiederum mit definierten Stoffflussbilanzen, Emissionen, Kosten usw. verbunden sind. Im Rahmen dieser Betrachtung koennen nur die Grundzuege einer derartigen Pruefung dargestellt werden. (orig.)

  10. Compartmental modeling and tracer kinetics

    CERN Document Server

    Anderson, David H

    1983-01-01

    This monograph is concerned with mathematical aspects of compartmental an­ alysis. In particular, linear models are closely analyzed since they are fully justifiable as an investigative tool in tracer experiments. The objective of the monograph is to bring the reader up to date on some of the current mathematical prob­ lems of interest in compartmental analysis. This is accomplished by reviewing mathematical developments in the literature, especially over the last 10-15 years, and by presenting some new thoughts and directions for future mathematical research. These notes started as a series of lectures that I gave while visiting with the Division of Applied ~1athematics, Brown University, 1979, and have developed in­ to this collection of articles aimed at the reader with a beginning graduate level background in mathematics. The text can be used as a self-paced reading course. With this in mind, exercises have been appropriately placed throughout the notes. As an aid in reading the material, the e~d of a ...

  11. Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS). Annual report 2013/14; Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS). Jahresbericht 2013/14

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2016-02-15

    The annual report 2013/14 of the Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS) includes projects and key activities on the following issues: reactor safety, waste disposal, radiation protection, environmental protection and the support of foreign authorities and TSO. The project executing organizations, the governmental funding, share holding and subsidiaries are summarized.

  12. Tracer monitoring of enhanced oil recovery projects

    Directory of Open Access Journals (Sweden)

    Kleven R.

    2013-05-01

    Full Text Available In enhanced oil recovery (EOR, chemicals are injected into the oil reservoir, either to increase macroscopic sweep efficiency, or to reduce remaining oil saturation in swept zones. Tracers can be used to identify reservoirs that are specifically suited for EOR operations. Injection of a selection of partitioning tracers, combined with frequent sample analysis of produced fluids, provides information suited for estimation of residual oil saturation. Tracers can also be used to evaluate and optimize the application of EOR chemicals in the reservoir. Suitable tracers will follow the EOR chemicals and assist in evaluation of retention, degradation or trapping. In addition to field applications, tracers also have a large potential as a tool to perform mechanistic studies of EOR chemicals in laboratory experiments. By labelling EOR chemicals with radioactive isotopes of elements such as H, C and S, detailed studies of transport mechanisms can be carried out. Co-injection of labelled compounds in dynamic flooding experiments in porous media will give information about retention or separation of the unique compounds constituting the chemical formulation. Separation of such compounds may be detrimental to obtaining the EOR effect expected. The paper gives new information of specific methods, and discusses current status for use of tracers in EOR operations.

  13. Analysis of tracer and thermal transients during reinjection

    Energy Technology Data Exchange (ETDEWEB)

    Kocabas, I.

    1989-10-01

    This work studied tracer and thermal transients during reinjection in geothermal reserviors and developed a new technique which combines the results from interwell tracer tests and thermal injection-backflow tests to estimate the thermal breakthrough times. Tracer tests are essential to determine the degree of connectivity between the injection wells and the producing wells. To analyze the tracer return profiles quantitatively, we employed three mathematical models namely, the convection-dispersion (CD) model, matrix diffusion (MD) model, and the Avodnin (AD) model, which were developed to study tracer and heat transport in a single vertical fracture. We considered three types of tracer tests namely, interwell tracer tests without recirculation, interwell tracer tests with recirculation, and injection-backflow tracer tests. To estimate the model parameters, we used a nonlinear regression program to match tracer return profiles to the solutions.

  14. Evaluation of leakage from fume hoods using tracer gas, tracer nanoparticles and nanopowder handling test methodologies.

    Science.gov (United States)

    Dunn, Kevin H; Tsai, Candace Su-Jung; Woskie, Susan R; Bennett, James S; Garcia, Alberto; Ellenbecker, Michael J

    2014-01-01

    The most commonly reported control used to minimize workplace exposures to nanomaterials is the chemical fume hood. Studies have shown, however, that significant releases of nanoparticles can occur when materials are handled inside fume hoods. This study evaluated the performance of a new commercially available nano fume hood using three different test protocols. Tracer gas, tracer nanoparticle, and nanopowder handling protocols were used to evaluate the hood. A static test procedure using tracer gas (sulfur hexafluoride) and nanoparticles as well as an active test using an operator handling nanoalumina were conducted. A commercially available particle generator was used to produce sodium chloride tracer nanoparticles. Containment effectiveness was evaluated by sampling both in the breathing zone (BZ) of a mannequin and operator as well as across the hood opening. These containment tests were conducted across a range of hood face velocities (60, 80, and 100 ft/min) and with the room ventilation system turned off and on. For the tracer gas and tracer nanoparticle tests, leakage was much more prominent on the left side of the hood (closest to the room supply air diffuser) although some leakage was noted on the right side and in the BZ sample locations. During the tracer gas and tracer nanoparticle tests, leakage was primarily noted when the room air conditioner was on for both the low and medium hood exhaust airflows. When the room air conditioner was turned off, the static tracer gas tests showed good containment across most test conditions. The tracer gas and nanoparticle test results were well correlated showing hood leakage under the same conditions and at the same sample locations. The impact of a room air conditioner was demonstrated with containment being adversely impacted during the use of room air ventilation. The tracer nanoparticle approach is a simple method requiring minimal setup and instrumentation. However, the method requires the reduction in

  15. Journal: A Review of Some Tracer-Test Design Equations for Tracer-Mass Estimation and Sample Collection Frequency

    Science.gov (United States)

    Determination of necessary tracer mass, initial sample-collection time, and subsequent sample-collection frequency are the three most difficult aspects to estimate for a proposed tracer test prior to conducting the tracer test. To facilitate tracer-mass estimation, 33 mass-estima...

  16. Journal: A Review of Some Tracer-Test Design Equations for Tracer-Mass Estimation and Sample Collection Frequency

    Science.gov (United States)

    Determination of necessary tracer mass, initial sample-collection time, and subsequent sample-collection frequency are the three most difficult aspects to estimate for a proposed tracer test prior to conducting the tracer test. To facilitate tracer-mass estimation, 33 mass-estima...

  17. Tracer-based prediction of thermal reservoir lifetime: scope, limitations, and the role of thermosensitive tracers

    Science.gov (United States)

    Ghergut, I.; Behrens, H.; Karmakar, S.; Licha, T.; Nottebohm, M.; Sauter, M.

    2012-04-01

    Thermal-lifetime prediction is a traditional endeavour of inter-well tracer tests conducted in geothermal reservoirs. Early tracer test signals (detectable within the first few years of operation) are expected to correlate with late-time production temperature evolutions ('thermal breakthrough', supposed to not occur before some decades of operation) of a geothermal reservoir. Whenever a geothermal reservoir can be described as a single-fracture system, its thermal lifetime will, ideally, be determined by two parameters (say, fracture aperture and porosity), whose inversion from conservative-tracer test signals is straightforward and non-ambiguous (provided that the tracer tests, and their interpretation, are performed in accordance to the rules of the art). However, as soon as only 'few more' fractures are considered, this clear-cut correlation is broken. A given geothermal reservoir can simultaneously feature a single-fracture behaviour, in terms of heat transport, and a multiple-fracture behaviour, in terms of solute tracer transport (or vice-versa), whose effective values of fracture apertures, spacings, and porosities are essentially uncorrelated between heat and solute tracers. Solute transport parameters derived from conservative-tracer tests will no longer characterize the heat transport processes (and thus temperature evolutions) taking place in the same reservoir. Parameters determining its thermal lifetime will remain 'invisible' to conservative tracers in inter-well tests. We demonstrate this issue at the example of a five-fracture system, representing a deep-geothermal reservoir, with well-doublet placement inducing fluid flow 'obliquely' to the fractures. Thermal breakthrough in this system is found to strongly depend on fracture apertures, whereas conservative-solute tracer signals from inter-well tests in the same system do not show a clear-cut correlation with fracture apertures. Only by using thermosensitive substances as tracers, a reliable

  18. Evaporation of alternative refrigerants to R 22 in technical shell and tube heat exchangers; Verdampfung von Ersatzkaeltemitteln fuer R 22 in technischen Rohrbuendel-Waermeaustauschern

    Energy Technology Data Exchange (ETDEWEB)

    Bonekamp, S. [Henkel KGaA, Duesseldorf (Germany)

    2000-05-01

    The refrigerant mixtures R 404A, R 407C, R 410A and R 507 and the pure fluids R 134a, ammonia, propane and propene are mainly recommended for substituting R 22. This report shows the results of heat transfer calculations for these refrigerants over a wide application range for flooded and for direct expansion evaporation. To determine the best substitute for R 22 the heat transfer areas are compared and a ranking for both types of evaporators is presented. (orig.) [German] Als Ersatz fuer R 22 werden hauptsaechlich die Kaeltemittelgemische R 404A, R 407C, R 410A und R 507 sowie die reinen Stoffe R 134a, Ammoniak, Propan und Propen diskutiert. Diese Arbeit stellt Berechnungsergebnisse fuer die verschiedenen Ersatzkaeltemittel in einem grossen technischen Anwendungsbereich sowohl fuer ueberflutete als auch fuer Einspritz-Verdampfer vor. Der Vergleich der ermittelten Waermeaustauschflaechen liefert fuer beide Verdampfungsarten eine Reihenfolge fuer die Verwendbarkeit als Austauschstoff fuer R 22. (orig.)

  19. Underground rail measuring cart for manual control; Manuell verfahrbarer Gleismesswagen fuer untertaegige Gleisanlagen

    Energy Technology Data Exchange (ETDEWEB)

    Puettmann, T. [Deutsche Montan Technologie GmbH, Bochum (Germany). Car Synergies Division

    2002-07-01

    A railway car with measuring equipment for underground applications was developed on the basis of available surface systems. This involved mechanical modifications as well as the development and testing of underground data acquisition and evaluation systems, i.e. sensors, computer and software. The system was tested in laboratory tests and is now in trial operation at Prosper-Haniel mine. [German] Im Rahmen des Vorhabens wurde ein Gleismesswagen fuer den Untertageeinsatz entwickelt. Hierbei wurde darauf geachtet, dass moeglichst auf vorhandene Systeme und Erfahrungen aus dem uebertaegigen Bereich zurueckgegriffen werden konnte. Auf Basis eines im uebertaegigen Einsatz erfolgreich eingesetzten Gleismesswagens wurden alle notwendigen Entwicklungsschritte absolviert. Neben mechanischen Modifikationen wurden das dazu notwendige untertagetaugliche Messdatenerfassungs- und auswertesystem, bestehend aus Sensorik, Messdatenerfassungscomputer und Software entwickelt, und fuer den Untertageeinsatz zugelassen. Im Labor konnte die Funktion der einzelnen Komponenten nachgewiesen werden. Der entwickelte Gleismesswagen steht fuer den Untertageeinsatz auf dem Bergwerk Prosper-Haniel zur Verfuegung. (orig.)

  20. Testing and comparison of four ionic tracers to measure stream flow loss by multiple tracer injection

    Science.gov (United States)

    Zellweger, G.W.

    1994-01-01

    An injectate containing lithium, sodium, chloride and bromide was added continuously at five sites along a 507 m study reach of St Kevin Gulch, Lake County, Colorado to determine which sections of the stream were losing water to the stream bed and to ascertain how well the four tracers performed. The acidity of the stream (pH 3.6) made it possible for lithium and sodium, which are normally absorbed by ion exchange with stream bed sediment, to be used as conservative tracers. Net flow losses as low as 0.81 s-1, or 8% of flow, were calculated between measuring sites. By comparing the results of simultaneous injection it was determined whether subsections of the study reach were influent or effluent. Evaluation of tracer concentrations along 116 m of stream indicated that all four tracers behaved conservatively. Discharges measured by Parshall flumes were 4-18% greater than discharges measured by tracer dilution. -from Author

  1. TRACER - TRACING AND CONTROL OF ENGINEERING REQUIREMENTS

    Science.gov (United States)

    Turner, P. R.

    1994-01-01

    TRACER (Tracing and Control of Engineering Requirements) is a database/word processing system created to document and maintain the order of both requirements and descriptive material associated with an engineering project. A set of hierarchical documents are normally generated for a project whereby the requirements of the higher level documents levy requirements on the same level or lower level documents. Traditionally, the requirements are handled almost entirely by manual paper methods. The problem with a typical paper system, however, is that requirements written and changed continuously in different areas lead to misunderstandings and noncompliance. The purpose of TRACER is to automate the capture, tracing, reviewing, and managing of requirements for an engineering project. The engineering project still requires communications, negotiations, interactions, and iterations among people and organizations, but TRACER promotes succinct and precise identification and treatment of real requirements separate from the descriptive prose in a document. TRACER permits the documentation of an engineering project's requirements and progress in a logical, controllable, traceable manner. TRACER's attributes include the presentation of current requirements and status from any linked computer terminal and the ability to differentiate headers and descriptive material from the requirements. Related requirements can be linked and traced. The program also enables portions of documents to be printed, individual approval and release of requirements, and the tracing of requirements down into the equipment specification. Requirement "links" can be made "pending" and invisible to others until the pending link is made "binding". Individuals affected by linked requirements can be notified of significant changes with acknowledgement of the changes required. An unlimited number of documents can be created for a project and an ASCII import feature permits existing documents to be incorporated

  2. TRACER - TRACING AND CONTROL OF ENGINEERING REQUIREMENTS

    Science.gov (United States)

    Turner, P. R.

    1994-01-01

    TRACER (Tracing and Control of Engineering Requirements) is a database/word processing system created to document and maintain the order of both requirements and descriptive material associated with an engineering project. A set of hierarchical documents are normally generated for a project whereby the requirements of the higher level documents levy requirements on the same level or lower level documents. Traditionally, the requirements are handled almost entirely by manual paper methods. The problem with a typical paper system, however, is that requirements written and changed continuously in different areas lead to misunderstandings and noncompliance. The purpose of TRACER is to automate the capture, tracing, reviewing, and managing of requirements for an engineering project. The engineering project still requires communications, negotiations, interactions, and iterations among people and organizations, but TRACER promotes succinct and precise identification and treatment of real requirements separate from the descriptive prose in a document. TRACER permits the documentation of an engineering project's requirements and progress in a logical, controllable, traceable manner. TRACER's attributes include the presentation of current requirements and status from any linked computer terminal and the ability to differentiate headers and descriptive material from the requirements. Related requirements can be linked and traced. The program also enables portions of documents to be printed, individual approval and release of requirements, and the tracing of requirements down into the equipment specification. Requirement "links" can be made "pending" and invisible to others until the pending link is made "binding". Individuals affected by linked requirements can be notified of significant changes with acknowledgement of the changes required. An unlimited number of documents can be created for a project and an ASCII import feature permits existing documents to be incorporated

  3. Solarsupport for schools. Utilization of sleeping photovoltaic plants for environmental communication; Solarsupport fuer Schulen. Schlafende Fotovoltaikanlagen fuer die Umweltkommunikation nutzen

    Energy Technology Data Exchange (ETDEWEB)

    Scharp, Michael; Dinziol, Martin; Kliche, Florian

    2009-07-15

    A central question of today's political debates is: Which means are there for ensuring a long-term and sustainable energy supply? Here, strategies for covering tomorrow's energy supply assign renewable energies a decisive role. In face of constantly rising prices for fossil fuels like carbon, oil and gas or the still open question concerning the removal of atomic waste, these discussions are eminently urgent. In order to confront climatic change, renewable energies are needed, so that also in the future a longterm and sustainable energy supply is secured. Sustainable energy supply is the context for the project Solarsupport, which has been supported by the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (FKZ 0327613). The project has been coordinated by the Institute for Environmental Questions (''Unabhaengige Institut fuer Umweltfragen e.V.'' - UFU) and conducted in cooperation with the Institute for Future Studies and Technology Assessment (''Institut fuer Zukunfststudien und Technologiebewertung gGmbH'' - IZT) and the German Society for Solar Energy, Regional Association Berlin-Brandenburg (Deutsche Gesellschaft fuer Sonnenenergie Regionalverband Berlin-Brandenburg e.V. - DGS). Particularly, the project is concerned with the pedagogical use of solar energy at school. Despite the relatively high number of solar plants at schools, only a few use their plants for pedagogical means. The project Solarsupport surveyed schools with solar plants. As the main reason for the insufficient pedagogical use of solar plants the interviewed teachers named the la ck of a pedagogical concept and their colleagues' disinterest, two factors which are able to reinforce one another. Moreover, it became clear that because of their insufficient technical equipment (no displays, no means for evaluating the plants' output, no connection with the school computers and internet) a high number of the

  4. Knowledge management for mining companies; Wissensmanagement fuer Bergbauunternehmen

    Energy Technology Data Exchange (ETDEWEB)

    Kretschmann, J. [RAG AG, Aachen (Germany). Ressort Belegschaft

    2000-08-10

    The knowledge of employees of a company is the basis of all actions and decisions in the company and all existing (core) competences, which flow into products and services. Existing advantages in knowledge can be converted into competitive advantages by forward looking knowledge management. In addition there is an opportunity for increases in efficiency, creativity and quality. Locally different but often comparable boundary conditions, which are associated with similar problems, solutions, decisions and actions, prevail in the individual mines worldwide. Hence, knowledge management in international mining companies or joint ventures can contribute to the availability and use of knowledge relevant to value creation without delay in all company divisions. (orig.) [German] Das Wissen der Beschaeftigten ist die Grundlage aller im Unternehmen getaetigten Handlungen und Entscheidungen und aller (Kern-)Kompetenzen, die in Produkte und Dienstleistungen einfliessen. Durch ein zukunftsorientiertes Wissensmanagement lassen sich vorhandene Wissensvorspruenge in Wettbewerbsvorteile umwandeln. Es bietet zudem die Chance fuer Effizienz-, Kreativitaets- und Qualitaetssteigerungen. Im Bergbau herrschen weltweit in den einzelnen Bergwerken zwar lokal unterschiedliche, aber oftmals doch vergleichbare Rahmenbedingungen vor, die mit aehnlichen Problemen, Loesungen, Entscheidungen und Handlungen verbunden sind. Deshalb kann Wissensmanagement in international agierenden Bergbauunternehmen oder Kooperationen dazu beitragen, dass wertschoepfungsrelevantes Wissen ohne Zeitverzug in allen Unternehmensbereichen zur Verfuegung steht und genutzt wird. (orig.)

  5. Selection criteria for sewage pumps; Auswahlkriterien fuer Abwasserpumpen

    Energy Technology Data Exchange (ETDEWEB)

    Kroeber, W. [Berliner Wasserbetriebe GmbH, Berlin (Germany)

    2002-05-01

    Sewage treatment is required by German law. Often, sewage pumping stations are needed for transporting sewage to the sewage plant. These pumping stations must function reliably as failure would cause environmental pollution. The contribution focuses on the pumps, which are the most important element of a pumping station. Background information and selection criteria are presented, and recommendations are made for ensuring uninterrupted and economic operation. [German] Die zur Reinhaltung der Umwelt bestehenden Gesetze und Verordnungen fordern eine ganzheitliche Behandlung bzw. Reinigung von Abwaessern durch Klaerwerke. In vielen Faellen sind fuer den Transport der Abwaesser zu den Klaerwerken eigens dafuer bestimmte Pumpwerke noetig. Als Glied einer Kette muessen diese Abwasserpumpwerke ihre Foerderaufgaben moeglichst stoerungsfrei erfuellen, da Ausfaelle zur Verunreinigungen der Umwelt fuehren koennen. Abwasserpumpwerke sind so zu gestalten, dass Ausfaelle der Abwasserfoerderung verhindert werden. Die ueber einen Jahrzehnte langen Zeitraum zu gewaehrleistende Foerdersicherheit setzt neben der Haltbarkeit des Bauwerkes vor allem eine hohe Einsatzbereitschaft der Maschinentechnik voraus. Die eingesetzte Maschinentechnik umfasst vor allen Dingen Pumpen und Antriebsmotoren sowie die dazugehoerige Steuerungstechnik. Da diese Abwasserpumpen das Herzstueck eines Abwasserpumpwerkes darstellen, sollen diese Maschinen Hauptgegenstand dieses Fachbeitrags sein. Besonders im Hinblick auf die Forderung nach einem stoerungsarmen und wirtschaftlichen Betrieb, werden Hintergruende und Auswahlkriterien genannt sowie Empfehlungen gegeben. (orig.)

  6. Using surface tension measurement in applications; Oberflaechenspannungsmesstechnik fuer den Prozesseinsatz

    Energy Technology Data Exchange (ETDEWEB)

    Haberland, R.; Krause, W. [SITA Messtechnik GmbH, Gostritzer Strasse 61-63, 01217 Dresden (Germany)

    2003-07-01

    When cleaning surfaces it is crucial for the process stability that the optimum surfactant concentration is maintained. The concentration of free surfactants can be measured by determining the surface tension. SITA Messtechnik has developed an innovative sensor based on the bubble pressure method. This sensor makes it possible to continuously measure surface tension with a high reliability. With this application for monitoring cleaning baths the potential to save money arises in regard to the use of raw materials, waste disposal and the costs resulting from undiscovered production failures. (Abstract Copyright [2003], Wiley Periodicals, Inc.) [German] Bei der Reinigung von Oberflaechen ist das Einhalten der optimalen Tensidkonzentration fuer die Prozesssicherheit entscheidend. Die Konzentration der freien Tenside ist messbar, indem die Oberflaechenspannung erfasst wird. Die SITA Messtechnik GmbH hat einen neuartigen Sensor auf der Basis der Blasendifferenzdruckmethode entwickelt, der eine kontinuierliche Messung der Oberflaechenspannung bei hoher Standzeit ermoeglicht. Mit dessen Anwendung zum Ueberwachen von Reinigungsbaedern ergeben sich Einsparpotentiale hinsichtlich Rohstoffeinsatz, Entsorgung und Fehlerfolgekosten. (Abstract Copyright [2003], Wiley Periodicals, Inc.)

  7. Physics for engineers. 15. rev. ed.; Physik fuer Ingenieure

    Energy Technology Data Exchange (ETDEWEB)

    Siebke, W. [Fachhochschule Koblenz (Germany); Simon, G.; Wuttke, W. [comps.] [Westsaechsische Hochschule Zwickau (FH) (Germany); Lindner, H.

    1999-07-01

    This is the 15th, completely revised edition of this standard textbook. Rather than presenting the current state of knowledge in physics, the book aims at presenting the fundamentals of physics in a more up-to-date manner. This applies especially to the pictures and graphical illustrations, which have been replaced or modified so as to meet modern standards. [German] Der LINDNER, Physik fuer Ingenieure, ist ein seit vielen Jahren eingefuehrtes Lehrbuch, das auf Grund seiner weiten Verbreitung bereits zu den Klassikern unter den einfuehrenden Lehrbuechern gezaehlt werden kann. Trotz zahlreicher Verbesserungen in den frueheren Auflagen schien aber nicht zuletzt auf Grund der gestiegenen Anforderungen in den Studiengaengen eine gruendliche Ueberarbeitung des Lehrbuches unumgaenglich: In der neubearbeiteten 15. Auflage wurde der gesamte Stoff einer kritischen Sichtung unterzogen. Viele Kapitel und Abschnitte wurden dabei neu verfasst und den aktuellen Anforderungen angepasst. Zielsetzung war dabei nicht so sehr, den aktuellen Stand der Technik in der Physik darzustellen, sondern die Grundlagen in eine zeitgemaesse Form zu bringen. Die Neubearbeitung betrifft auch das gesamte Bildmaterial. Entbehrliches wurde entfernt, Bewaehrtes beibehalten und viel Neues hinzugefuegt, so dass auch die grafische Gestaltung den veraenderten Anspruechen entspricht. (orig.)

  8. Radiopharmaceuticals for renal function imaging; Radiopharmaka fuer die Nierenfunktionsdiagnostik

    Energy Technology Data Exchange (ETDEWEB)

    Brandau, W. [Klinik fuer Nuklearmedizin, Arbeitsgruppe Nuklearchemie und Radiopharmazie, Universitaetsklinikum Essen (Germany)

    2003-09-01

    Due to its favourable physical properties, [{sup 99m}Tc]Technetium is the mostly used radionuclide in nuclear medicine. It can only be used as metal complexes, whose pharmacokinetics cannot be predicted easily. By systematic variations of a known compound, Tc-complexes could be synthesized which are actively excreted by the kidneys. Thus, on the one hand, the tubular extraction rate can now be quantified in addition to the glomerular filtration rate and on the other hand, scintigraphic imaging is possible by the use of Tc-pharmaceuticals, which are eliminated by active tubular transport. (orig.) [German] [{sup 99m}Tc]Technetium ist aufgrund seiner optimalen physikalischen Eigenschaften fuer die Bildgebung das meistverwendete Radionuklid in der Nuklearmedizin. Es kann aber nur in Form von Metallkomplexen eingesetzt werden, deren in vivo Verhalten schwer vorhersagbar ist. In den letzten Jahren ist es jedoch durch systematische Variation einer Leitstruktur gelungen, Technetium-Radiopharmaka zu entwickeln, die renal aktiv transportiert werden. Dadurch kann einerseits neben der Glomerulaeren Filtrationsrate nun auch die Tubulaere Extraktionsrate quantifiziert werden, andererseits ist erstmals die Szintigraphie mit Technetiummarkierten Substanzen moeglich, die tubulaer sezerniert werden. (orig.)

  9. Control system for the whole supermarket; Regeltechnik fuer den kompletten Supermarkt

    Energy Technology Data Exchange (ETDEWEB)

    Wendelborn, H. [Danfoss GmbH, Offenbach (Germany)

    2003-10-01

    The electronic control system for refrigerated cabinets and refrigeration installations allows the operators of supermarkets to save energy. By integrating the controller for refrigeration, heating, ventilation and air conditioning into an overall communication concept, a monitoring and evaluation system is produced, which supplies the plant operator with data for the analysis of the operational data of their markets. (orig.) [German] Die elektronische Regeltechnik fuer Kuehlmoebel und Kaelteanlagen erlaubt den Betreibern von Supermaerkten einen Energie sparenden Anlagenbetrieb. Durch die Einbindung der Regelung fuer Kaelte, Heizung, Lueftung und Klimatisierung in ein gesamtes Kommunikationskonzept entsteht ein Ueberwachungs- und Bewertungssystem, das dem Anlagenbetreiber Daten zur betriebswirtschaftlichen Analyse seiner Maerkte liefert. (orig.)

  10. The 1996 thaw as a {sup 18}O tracer experiment at the lysimeter plant in Wagna; Die Schneeschmelze 1996 als {sup 18}O-Tracerversuch an der Lysimeteranlage in Wagna

    Energy Technology Data Exchange (ETDEWEB)

    Fank, J.; Zojer, H. [Forschungsgesellschaft Joanneum, Graz (Austria). Inst. fuer Geothermie und Hydrogeologie; Stichler, W. [GSF - Forschungszentrum fuer Umwelt und Gesundheit GmbH, Neuherberg (Germany). Inst. fuer Hydrologie

    1999-02-01

    In the year 1991 a research site was set up in Wagna in the western Leibnitz Field (Styria) which permits an examination of seepage water movement and of material transport as a function of the permeability of the uppermost soil layers and the underlying more coarsly clastic sediments under locale-specific natural management systems. Research at this site is largely based on hydrochemical and isotope-hydrological analysis. The {sup 18}O isotope is an ideal natural tracer of water movement. Infiltration water from the thaw following a snowy winter was displaced downward into the unsaturated zone as a result of a major precipitation event of 85.5 mm from April 2 to 5, 1996. This displacement is evident in the {sup 18}O concentrations of the seepage water at various measuring depths. The displacement is associated with recharge events, thaw processes tending to produce dispersive flows and precipitation events leading to ``piston flow effects. Winter precipitation water reaches a depth of 60 to 70 cm by mid-April. The attenuated {sup 18}O concentration reveals the predominant flow characteristics in the different compartments of the unsaturated zone (finely clastic soils, gravels, and sands). [Deutsch] Im Jahre 1991 wurde in Wagna, im westlichen Leibnitzer Feld (Steiermark), eine Forschungsstation errichtet, die es erlaubt, unter ortsueblichen, natuerlichen Bewirtschaftungssystemen die Sickerwasserbewegung und den Transport von Stoffen in Abhaengigkeit von der Durchlaessigkeit der obersten Bodenschichten und der darunter folgenden groeberklastischen Sedimente vor allem auf Grundlage der hydrochemischen und isotopenhydrologischen Analytik zu untesuchen. Die Verwendung des {sup 18}O-Isotops als natuerlicher Tracer repraesentiert in idealer Weise die Bewegung des Wassers. Infiltrationswasser aus der Schneeschmelze nach einem schneereichen Winter wurde durch ein starkes Niederschlagsereignis von 85.6 mm zwischen 2. und 5. April 1996 in der ungesaettigten Zone

  11. Enhanced Oil Recovery: Aqueous Flow Tracer Measurement

    Energy Technology Data Exchange (ETDEWEB)

    Joseph Rovani; John Schabron

    2009-02-01

    A low detection limit analytical method was developed to measure a suite of benzoic acid and fluorinated benzoic acid compounds intended for use as tracers for enhanced oil recovery operations. Although the new high performance liquid chromatography separation successfully measured the tracers in an aqueous matrix at low part per billion levels, the low detection limits could not be achieved in oil field water due to interference problems with the hydrocarbon-saturated water using the system's UV detector. Commercial instrument vendors were contacted in an effort to determine if mass spectrometry could be used as an alternate detection technique. The results of their work demonstrate that low part per billion analysis of the tracer compounds in oil field water could be achieved using ultra performance liquid chromatography mass spectrometry.

  12. Transformationally decoupling clustering and tracer bias

    CERN Document Server

    Neyrinck, Mark C

    2014-01-01

    Gaussianizing transformations are used statistically in many non-cosmological fields, but in cosmology, we are only starting to apply them. Here I explain a strategy of analyzing the 1-point function (PDF) of a spatial field, together with the 'essential' clustering statistics of the Gaussianized field, which are invariant to a local transformation. In cosmology, if the tracer sampling is sufficient, this achieves two important goals. First, it can greatly multiply the Fisher information, which is negligible on nonlinear scales in the usual $\\delta$ statistics. Second, it decouples clustering statistics from a local bias description for tracers such as galaxies.

  13. Geologic flow characterization using tracer techniques

    Energy Technology Data Exchange (ETDEWEB)

    Klett, R. D.; Tyner, C. E.; Hertel, Jr., E. S.

    1981-04-01

    A new tracer flow-test system has been developed for in situ characterization of geologic formations. This report describes two sets of test equipment: one portable and one for testing in deep formations. Equations are derived for in situ detector calibration, raw data reduction, and flow logging. Data analysis techniques are presented for computing porosity and permeability in unconfined isotropic media, and porosity, permeability and fracture characteristics in media with confined or unconfined two-dimensional flow. The effects of tracer pulse spreading due to divergence, dispersion, and porous formations are also included.

  14. A review of methods for modelling environmental tracers in groundwater: Advantages of tracer concentration simulation

    Science.gov (United States)

    Turnadge, Chris; Smerdon, Brian D.

    2014-11-01

    Mathematical models of varying complexity have been developed since the 1960s to interpret environmental tracer concentrations in groundwater flow systems. This review examines published studies of model-based environmental tracer interpretation, the progress of different modelling approaches, and also considers the value of modelling tracer concentrations directly rather than estimations of groundwater age. Based on citation metrics generated using the Web of Science and Google Scholar reference databases, the most highly utilised interpretation approaches are lumped parameter models (421 citations), followed closely by direct age models (220 citations). A third approach is the use of mixing cell models (99 citations). Although lumped parameter models are conceptually simple and require limited data, they are unsuitable for characterising the internal dynamics of a hydrogeological system and/or under conditions where large scale anthropogenic stresses occur within a groundwater basin. Groundwater age modelling, and in particular, the simulation of environmental tracer transport that explicitly accounts for the accumulation and decay of tracer mass, has proven to be highly beneficial in constraining numerical models. Recent improvements in computing power have made numerical simulation of tracer transport feasible. We argue that, unlike directly simulated ages, the results of tracer mass transport simulation can be compared directly to observations, without needing to correct for apparent age bias or other confounding factors.

  15. Reports from Institut fuer Strassen- und Verkehrswesen 2000/2001; Arbeiten aus dem Institut fuer Strassen- und Verkehrswesen 2000/2001

    Energy Technology Data Exchange (ETDEWEB)

    Kuehne, R.D. (ed.)

    2001-07-01

    The papers in this volume provide an insight into current research of the Institut fuer Strassen- und Verkehrswesen, which covers experimental and theoretical studies on motorway capacity, energy consumption and climate effects of traffic, emissions and immissions, and a description of traffic both on a perceptional basis and by a review of secular trends. [German] Die in der vorliegenden Ausgabe der Institutsschriftenreihe zusammengefassten Arbeiten geben einen Einblick in die aktuellen Forschungsthemen am Institut fuer Strassen- und Verkehrswesen. Die Arbeiten reichen dabei von experimentellen und theoretischen Arbeiten ueber die Leistungsfaehigkeit von Fernstrassen, ueber Fragen des Energieverbrauchs und der Klimaauswirkungen des Verkehr sowie der Emissions- und Immissionsmodellierung bis hin zur Beschreibung des Verkehrsverhaltens auf der Wahrnehmungsebene und in der Darstellung der saekularen Entwicklungen. (orig.)

  16. Blood tracer kinetics in the arterial tree.

    Directory of Open Access Journals (Sweden)

    Elias Kellner

    Full Text Available Evaluation of blood supply of different organs relies on labeling blood with a suitable tracer. The tracer kinetics is linear: Tracer concentration at an observation site is a linear response to an input somewhere upstream the arterial flow. The corresponding impulse response functions are currently treated empirically without incorporating the relation to the vascular morphology of an organ. In this work we address this relation for the first time. We demonstrate that the form of the response function in the entire arterial tree is reduced to that of individual vessel segments under approximation of good blood mixing at vessel bifurcations. The resulting expression simplifies significantly when the geometric scaling of the vascular tree is taken into account. This suggests a new way to access the vascular morphology in vivo using experimentally determined response functions. However, it is an ill-posed inverse problem as demonstrated by an example using measured arterial spin labeling in large brain arteries. We further analyze transport in individual vessel segments and demonstrate that experimentally accessible tracer concentration in vessel segments depends on the measurement principle. Explicit expressions for the response functions are obtained for the major middle part of the arterial tree in which the blood flow in individual vessel segments can be treated as laminar. When applied to the analysis of regional cerebral blood flow measurements for which the necessary arterial input is evaluated in the carotid arteries, present theory predicts about 20% underestimation, which is in agreement with recent experimental data.

  17. Blood tracer kinetics in the arterial tree.

    Science.gov (United States)

    Kellner, Elias; Gall, Peter; Günther, Matthias; Reisert, Marco; Mader, Irina; Fleysher, Roman; Kiselev, Valerij G

    2014-01-01

    Evaluation of blood supply of different organs relies on labeling blood with a suitable tracer. The tracer kinetics is linear: Tracer concentration at an observation site is a linear response to an input somewhere upstream the arterial flow. The corresponding impulse response functions are currently treated empirically without incorporating the relation to the vascular morphology of an organ. In this work we address this relation for the first time. We demonstrate that the form of the response function in the entire arterial tree is reduced to that of individual vessel segments under approximation of good blood mixing at vessel bifurcations. The resulting expression simplifies significantly when the geometric scaling of the vascular tree is taken into account. This suggests a new way to access the vascular morphology in vivo using experimentally determined response functions. However, it is an ill-posed inverse problem as demonstrated by an example using measured arterial spin labeling in large brain arteries. We further analyze transport in individual vessel segments and demonstrate that experimentally accessible tracer concentration in vessel segments depends on the measurement principle. Explicit expressions for the response functions are obtained for the major middle part of the arterial tree in which the blood flow in individual vessel segments can be treated as laminar. When applied to the analysis of regional cerebral blood flow measurements for which the necessary arterial input is evaluated in the carotid arteries, present theory predicts about 20% underestimation, which is in agreement with recent experimental data.

  18. Fractal tracer distributions in turbulent field theories

    DEFF Research Database (Denmark)

    Hansen, J. Lundbek; Bohr, Tomas

    1998-01-01

    We study the motion of passive tracers in a two-dimensional turbulent velocity field generated by the Kuramoto-Sivashinsky equation. By varying the direction of the velocity-vector with respect to the field-gradient we can continuously vary the two Lyapunov exponents for the particle motion and t...

  19. Suitability of tracers; Eignung von Tracern

    Energy Technology Data Exchange (ETDEWEB)

    Klotz, D. [GSF - Forschungszentrum fuer Umwelt und Gesundheit GmbH, Neuherberg (Germany). Inst. fuer Hydrologie

    1999-02-01

    Hydrological tracer techniques are a means of making statements on the direction and speed of underground water. One of the simpler tasks is to find out whether there is hydrological communication between two given points. This requires a determination of the direction of flow, which places less exacting demands on the properties of the tracer than does the task of determining the flow velocity of underground water. Tracer methods can serve to infer from flow velocity the distance (flow) velocity, which is defined as the ratio between the distance between two points located in flow direction and the actual time it takes water to flow from one to the other. [Deutsch] Mit Hilfe der hydrologischen Markierungstechniken koennen Aussagen ueber die Richtung und die Geschwindigkeit von Bewegungen des unterirdischen Wassers gemacht werden. Der einfachere Fall liegt vor, wenn festgestellt werden soll, ob zwischen zwei Punkten eine hydrologische Verbindung besteht. Bei dieser Fliessrichtungsbestimmung sind die Forderungen an die Eigenschaften der einzusetzenden Tracer geringer als bei der Bestimmung der Geschwindigkeit des unterirdischen Wassers. Von den Geschwindigkeiten des unterirdischen Wassers ist die Abstands-(Fliess)geschwindigkeit, die definiert ist durch das Verhaeltnis aus dem Abstand und der wahren Fliesszeit zwischen zwei in Bewegungsrichtung gelegenen Punkten, durch Tracermethoden zu bestimmen. (orig.)

  20. Using neural networks to describe tracer correlations

    Directory of Open Access Journals (Sweden)

    D. J. Lary

    2004-01-01

    Full Text Available Neural networks are ideally suited to describe the spatial and temporal dependence of tracer-tracer correlations. The neural network performs well even in regions where the correlations are less compact and normally a family of correlation curves would be required. For example, the CH4-N2O correlation can be well described using a neural network trained with the latitude, pressure, time of year, and methane volume mixing ratio (v.m.r.. In this study a neural network using Quickprop learning and one hidden layer with eight nodes was able to reproduce the CH4-N2O correlation with a correlation coefficient between simulated and training values of 0.9995. Such an accurate representation of tracer-tracer correlations allows more use to be made of long-term datasets to constrain chemical models. Such as the dataset from the Halogen Occultation Experiment (HALOE which has continuously observed CH4  (but not N2O from 1991 till the present. The neural network Fortran code used is available for download.

  1. Travel-time-based thermal tracer tomography

    Science.gov (United States)

    Somogyvári, Márk; Bayer, Peter; Brauchler, Ralf

    2016-05-01

    Active thermal tracer testing is a technique to get information about the flow and transport properties of an aquifer. In this paper we propose an innovative methodology using active thermal tracers in a tomographic setup to reconstruct cross-well hydraulic conductivity profiles. This is facilitated by assuming that the propagation of the injected thermal tracer is mainly controlled by advection. To reduce the effects of density and viscosity changes and thermal diffusion, early-time diagnostics are used and specific travel times of the tracer breakthrough curves are extracted. These travel times are inverted with an eikonal solver using the staggered grid method to reduce constraints from the pre-defined grid geometry and to improve the resolution. Finally, non-reliable pixels are removed from the derived hydraulic conductivity tomograms. The method is applied to successfully reconstruct cross-well profiles as well as a 3-D block of a high-resolution fluvio-aeolian aquifer analog data set. Sensitivity analysis reveals a negligible role of the injection temperature, but more attention has to be drawn to other technical parameters such as the injection rate. This is investigated in more detail through model-based testing using diverse hydraulic and thermal conditions in order to delineate the feasible range of applications for the new tomographic approach.

  2. Nanoparticle tracers in calcium carbonate porous media

    KAUST Repository

    Li, Yan Vivian

    2014-07-15

    Tracers are perhaps the most direct way of diagnosing subsurface fluid flow pathways for ground water decontamination and for natural gas and oil production. Nanoparticle tracers could be particularly effective because they do not diffuse away from the fractures or channels where flow occurs and thus take much less time to travel between two points. In combination with a chemical tracer they can measure the degree of flow concentration. A prerequisite for tracer applications is that the particles are not retained in the porous media as the result of aggregation or sticking to mineral surfaces. By screening eight nanoparticles (3-100 nm in diameter) for retention when passed through calcium carbonate packed laboratory columns in artificial oil field brine solutions of variable ionic strength we show that the nanoparticles with the least retention are 3 nm in diameter, nearly uncharged, and decorated with highly hydrophilic polymeric ligands. The details of these column experiments and the tri-modal distribution of zeta potential of the calcite sand particles in the brine used in our tests suggests that parts of the calcite surface have positive zeta potential and the retention of negatively charged nanoparticles occurs at these sites. Only neutral nanoparticles are immune to at least some retention. © 2014 Springer Science+Business Media.

  3. Ultrasound motion tracking for radiation therapy; Ultraschallbewegungstracking fuer die Strahlentherapie

    Energy Technology Data Exchange (ETDEWEB)

    Jenne, J. [Fraunhofer-Institut fuer Bildgestuetzte Medizin MEVIS, Bremen (Germany); Mediri GmbH, Heidelberg (Germany); Schwaab, J. [Mediri GmbH, Heidelberg (Germany)

    2015-11-15

    bzw. -kompensation werden zurzeit untersucht oder schon in der Klinik angewendet. Die Sonographie ist eine vielversprechende Option, die nun kurz vor der klinischen Implementierung steht. Hoher Weichteilkontrast, Echtzeitfaehigkeit, Verzicht auf ionisierende Strahlung sowie relativ geringe Anschaffungskosten zeichnen den Ultraschall besonders fuer diesen Zweck aus. Ultraschallbewegungstracking ist ein bildbasierter Ansatz, d. h. das Zielvolumen oder eine damit verbundene Struktur werden direkt beobachtet und deren Bewegung automatisch auf dem Ultraschallbild nachverfolgt. Diverse Algorithmen stehen derzeit zur Verfuegung, die sowohl aus 2-D- als auch 3-D-Bildern die aktuellen Koordinaten einer Zielstruktur liefern. Die Auswahl eines passenden Schallfensters ist jedoch nicht trivial, und ein Goldstandard fuer die Positionierung und Halterung des Schallkopfs wurde noch nicht erarbeitet. Ausserdem sind die Verarbeitung der Koordinateninformation an der Therapieeinheit sowie die dynamische Anpassung des Strahlfeldes grosse Herausforderungen. Es ist offen, ob sich Ultraschallbewegungstracking in der klinischen Routine etabliert, obwohl alle technischen Voraussetzungen als erfuellt angesehen werden koennen, sodass weiterhin spannende Entwicklungen in diesem Forschungsfeld zu erwarten sind. (orig.)

  4. Thermodynamics for engineers. Text- and workbook for university students. 2. tot. rev. ed.; Thermodynamik fuer Ingenieure. Ein Lehr- und Arbeitsbuch fuer das Studium

    Energy Technology Data Exchange (ETDEWEB)

    Langeheinecke, K. [ed.; Jany, P. [Fachhochschule Ravensburg-Weingarten, Weingarten (Germany); Sapper, E. [Fachhochschule Konstanz (Germany)

    1999-07-01

    Technical thermodynamics is part of the basics of engineering. This book lays the foundation needed to understand the real thermal processes. Extensive explanations with a large number of diagrams, examples, problems and exercises illustrate the theory, philosophy, methods and tools of thermodynamics and make this book a valuable instrument of self-study. Specially taken into account is the imparting of technical terminology. The added CDrom presents computer codes for heat transfer, gas-vapor mixtures, combustion and material values, a formula collection THERMODYNAMIK MEMORY and an extensive alphabetic THERMODYNAMIK GLOSSAR. The content in brief: Sytems and their description, material properties, energy, the second fundamental sentence, ideal gases, gas- and gas-vapor-mixtures, heat engines, heat transfer and combustion. [German] Die Technische Thermodynamik gehoert zur Basis der Ingenieurwissenschaften. Das Buch vermittelt die Grundlagen fuer das Verstehen der realen thermischen Prozesse. Ausfuehrliche Texte mit vielen bildlichen Darstellungen, durchgerechnete Beispiele, zahlreiche Fragen und Uebungen verdeutlichen die Aussagen, Denkweisen, Methoden und Werkzeuge der Thermodynamik und empfehlen dieses Buch besonders zum Selbststudium. Besonderer Wert wird auf die Vermittlung der Fachsprache gelegt. Die beigefuegte CD-Rom bringt Rechenprogramme fuer Waermeuebertragung, Gas-Dampf-Gemische und Verbrennung sowie fuer Stoffwerte, die Formelsammlung THERMODYNAMIK MEMORY und das umfangreiche alphabetische THERMODYNAMIK GLOSSAR. Der Inhalt - die Systeme und ihre Beschreibung - Stoffeigenschaften - Energien - der zweite Hauptsatz - ideale Gase - Gas- und Gas-Dampf-Gemische - thermische Maschinen - Waermeuebertragung - Verbrennung. (orig.)

  5. Tracer injection techniques in flowing surface water

    Science.gov (United States)

    Wörman, A.

    2009-04-01

    Residence time distributions for flowing water and reactive matter are commonly used integrated properties of the transport process for determining technical issues of water resource management and in eco-hydrological science. Two general issues for tracer techniques are that the concentration-vs-time relation following a tracer injection (the breakthrough curve) gives unique transport information in different parts of the curve and separation of hydromechanical and reactive mechanisms often require simultaneous tracer injections. This presentation discusses evaluation methods for simultaneous tracer injections based on examples of tracer experiments in small rivers, streams and wetlands. Tritiated water is used as a practically inert substance to reflect the actual hydrodynamics, but other involved tracers are Cr(III)-51, P-32 and N-15. Hydromechanical, in-stream dispersion is reflected as a symmetrical spreading of the spatial concentration distribution. This requires that the transport distance over water depth is larger than about five times the flow Peclet number. Transversal retention of both inert and reactive solutes is reflected in terms of the tail of the breakthrough curve. Especially, reactive solutes can have a substantial magnification of the tailing behaviour depending on reaction rates or partitioning coefficients. To accurately discriminate between the effects of reactions and hydromechanical mixing its is relevant to use simultaneous injections of inert and reactive tracers with a sequential or integrated evaluation procedure. As an example, the slope of the P-32 tailing is consistently smaller than that of a simultaneous tritium injection in Ekeby wetland, Eskilstuna. The same applies to N-15 injected in the same experiment, but nitrogen is affected also by a systematic loss due to denitrification. Uptake in stream-bed sediments can be caused by a pumping effect arising when a variable pressure field is created on the stream bottom due to bed

  6. Standard for decentralized power supply to the public grid; Norm fuer dezentrale Netzeinspeisung

    Energy Technology Data Exchange (ETDEWEB)

    Seltmann, T. [SolarAgentur, Nuernberg (Germany); Kremer, P. [Siemens AG, Fuerth (Germany); Lappe, U. [Berufsgenossenschaft der Feinmechanik und Elektrotechnik, Koeln (Germany). Abt. Sicherheitsfragen der Elektrotechnik

    1999-08-01

    Photovoltaic energy conversion has finally been acknowledged in technical specifications. The new DIN VDE 0126 regulates decentralized power supply to the publc grid and improves protection of working staff. [German] Die photovoltaische Stromerzeugung haelt jetzt auch Einzug in technische Regelwerke. Die kuerzlich in Kraft getretene DIN VDE 0126 macht den Weg frei fuer die flaechendeckende dezentrale Netzeinspeisung. Ausserdem verbessert diese Norm den Personenschutz. (orig.)

  7. Alternative refrigerants for supermarket refrigerators; Alternative Kaeltemittel fuer Supermarkt-Kaelteanlagen

    Energy Technology Data Exchange (ETDEWEB)

    Haaf, S.; Heinbokel, B. [Linde AG, Geschaeftsbereich Kaeltetechnik, Koeln (Germany)

    2003-07-01

    Most supermarket refrigerators are still equipped with H-CFC (R404A and R134a), which contribute to global warming. Natural refrigerants were tested as substitutes, i.e. NH{sub 3}, propene and CO{sub 2}, but H-CFC systems are still the best solution. Attempts are now made to reduce refrigerant filling levels and prevent leakage. [German] Die in Supermarkt-Kaelteanlagen ueberwiegend eingesetzten HFKW-Kaeltemittel R404A und R134a weisen betraechtliche Treibhauspotentiale auf. Im Zusammenhang mit auftretenden Kaeltemittel-Leckagen wirkt sich dies auf die Hoehe des gesamten Treibhauseffekts TEWI derartiger Anlagen aus. Im Laufe der letzten Jahre wurde von Linde eine grosse Anzahl von Anlagen mit den natuerlichen Kaeltemitteln NH{sub 3}, Propen und fuer die Tiefkuehlung auch mit CO{sub 2} installiert. Waehrend die Betriebssicherheit dieser Anlagen als gut bezeichnet werden kann, weisen die Anlagen mit NH{sub 3} und Propen, bei denen die Kuehlung der Verbraucher ueber Kaeltetraegerkreislaeufe erfolgt, deutlich hoehere Energieverbraeuche und Investitionskosten auf. Gute Chancen fuer eine wirtschaftliche Betriebsweise bieten hingegen CO{sub 2}-Kaskadenanlagen fuer die Tiefkuehlung. Da fuer den Bereich der Normalkuehlung kurzfristig keine akzeptable Loesung mit CO{sub 2} als Kaeltemittel zur Verfuegung stehen wird, bilden Anlagen mit HFKW-Kaeltemitteln weiterhin die beste Loesung, wobei weitere Reduzierung der Kaeltemittel-Fuellmengen und Leckagen zur Steigerung der Umweltfreundlichkeit notwendig und moeglich sind. (orig.)

  8. Geothermal research. Innovative geothermal probe field for an Art Nouveau villa; Geothermieforschung. Innovatives Erdwaermesondenfeld fuer Jugendstilvilla

    Energy Technology Data Exchange (ETDEWEB)

    Buechner, Ute; Dworrak, Matthias C. [FITR - Forschungsinstitut fuer Tief- und Rohrleitungsbau gemeinnuetzige GmbH, Weimar (Germany)

    2010-07-01

    The Weimarer Forschungsinstitut fuer Tief- und Rohrleitungsbau (FITR) is seated in a historical Art Nouveau Villa owned by the Max-Zoellner-Stiftung. The building was modernized exemplarily. It now has a bivalent heating system with a geothermal field. Modern measuring technology was implemented, and project findings of geothermal projects of the FITR were implemented.

  9. Integral energy concepts for office and residential buildings; Integrale Energiekonzepte fuer Buero- und Wohngebaeude

    Energy Technology Data Exchange (ETDEWEB)

    Velten, W.

    1998-06-01

    It has been confirmed by practical project experience that integral energy concepts are an excellent basis for the construction of energy-efficient buildings. In the extreme case buildings can even be self-sufficient in their energy supply. Uniting the responsibility for the overall energy and technology concept in the hands of a single contractor can help reduce frictional losses between those involved in the planning as well costs. A good example of this is the use of a simulation calculation for the prescribed demonstration of proper heat insulation. The presented projects show that it is possible to construct ecologically answerable buildings at attractively low costs. The presented concepts appear particularly convincing from the viewpoint of long-term maintenance of value and user-specific advantages such as agreeable working conditions. [Deutsch] Die konkreten Projekterfahrungen bestaetigen, dass durch integrale Energiekonzepte sowohl im Verwaltungs- als auch im Wohnungsbau hervorragende Voraussetzungen fuer energiesparende Gebaeude geschaffen werden koennen. Im Extremfall kann sogar eine autarke Energieversorgung erreicht werden. Durch Zusammenfassung der Gesamtverantwortung fuer das Energie- und Technikkonzept in einer Hand koennen Reibungsverluste zwischen den Planungsbeteiligten reduziert und Kosten gesenkt werden. Ein Beispiel hierfuer ist die Verbindung des vorgeschriebenen Waermeschutznachweises mit einer fuer alle Beteiligten wesentlich aussagekraeftigeren Simulationsrechnung. Die vorgestellten Projekte zeigen, dass oekologisch sinnvolle Gebaeude auch zu oekonomisch attraktiven Kosten erstellt werden koennen, wobei insbesondere der Aspekt des langfristigen Werterhalts und die nutzerspezifischen Vorteile, z.B. durch angenehmere Arbeitsbedingungen, fuer die vorgestellten Konzepte spricht. (orig.)

  10. Quality assurance for the incorporation surveillance in Germany; Qualitaetssicherung fuer die Inkorporationsueberwachung in Deutschland

    Energy Technology Data Exchange (ETDEWEB)

    Buchholz, Werner; Gerstmann, Udo; Hartmann, Martina; Loescher, Simone; Meisenberg, Oliver; Woidy, Patrick [Bundesamt fuer Strahlenschutz, Oberschleissheim (Germany). FB Strahlenschutz und Gesundheit

    2017-08-01

    The coordination center of the Bundesamt fuer Strahlenschutz is performing annual ring experiments for in-vivo and in-vitro measuring points. This procedure allows checking the measuring data and the competence of the personnel. In the last years these tests included also radionuclides that are important in radiation emergency protection. Case studies for dose determination based on incorporation scenarios are included.

  11. Halon-1301, a new Groundwater Age Tracer

    Science.gov (United States)

    Beyer, Monique; van der Raaij, Rob; Morgenstern, Uwe; Jackson, Bethanna

    2015-04-01

    Groundwater dating is an important tool to assess groundwater resources in regards to direction and time scale of groundwater flow and recharge and to assess contamination risks and manage remediation. To infer groundwater age information, a combination of different environmental tracers, such as tritium and SF6, are commonly used. However ambiguous age interpretations are often faced, due to a limited set of available tracers and limitations of each tracer method when applied alone. There is a need for additional, complementary groundwater age tracers. We recently discovered that Halon-1301, a water soluble and entirely anthropogenic gaseous substance, may be a promising candidate [Beyer et al, 2014]. Halon-1301 can be determined along with SF6, SF5CF3 and CFC-12 in groundwater using a gas chromatography setup with attached electron capture detector developed by Busenberg and Plummer [2008]. Halon-1301 has not been assessed in groundwater. This study assesses the behaviour of Halon-1301 in water and its suitability as a groundwater age tracer. We determined Halon-1301 in 17 groundwater and various modern (river) waters sites located in 3 different groundwater systems in the Wellington Region, New Zealand. These waters have been previously dated with tritium, CFC-12, CFC-11 and SF6 with mean residence times ranging from 0.5 to over 100 years. The waters range from oxic to anoxic and some show evidence of CFC contamination or degradation. This allows us to assess the different properties affecting the suitability of Halon-1301 as groundwater age tracer, such as its conservativeness in water and local contamination potential. The samples are analysed for Halon-1301 and SF6simultaneously, which allows identification of issues commonly faced when using gaseous tracers such as contamination with modern air during sampling. Overall we found in the assessed groundwater samples Halon-1301 is a feasible new groundwater tracer. No sample indicated significantly elevated

  12. Software for radiation protection; Software fuer den Strahlenschutz

    Energy Technology Data Exchange (ETDEWEB)

    Graffunder, H. [Ingenieurbuero Graffunder, Stutensee (Germany)

    2002-03-01

    The software products presented are universally usable programs for radiation protection. The systems were designed in order to establish a comprehensive database specific to radiation protection and, on this basis, model in programs subjects of radiation protection. Development initially focused on the creation of the database. Each software product was to access the same nuclide-specific data; input errors and differences in spelling were to be excluded from the outset. This makes the products more compatible with each other and able to exchange data among each other. The software products are modular in design. Functions recurring in radiation protection are always treated the same way in different programs, and also represented the same way on the program surface. The recognition effect makes it easy for users to familiarize with the products quickly. All software products are written in German and are tailored to the administrative needs and codes and regulations in Germany and in Switzerland. (orig.) [German] Die hier vorgestellten Softwareprodukte sind universell einsetzbare Programme fuer den Strahlenschutz. Die Systeme wurden mit dem Ziel erstellt, eine umfangreiche strahlenschutz-spezifische Datenbasis zu erschaffen und darauf basierend Themen des Strahlenschutzes programmtechnisch abzubilden. Der Schwerpunkt der Entwicklungen lag zunaechst bei der Schaffung der Datenbasis. Jedes Softwareprodukt sollte auf dieselben nuklidspezifischen Daten zurueckgreifen, Eingabefehler und unterschiedliche Schreibweisen sollten von vorneherein ausgeschlossen werden. Die Produkte selbst wurden damit kompatibel zueinander und koennen Daten untereinander austauschen. Die Softwareprodukte sind modular aufgebaut. Im Strahlenschutz wiederkehrende Funktionen werden in verschiedenen Programmen immer gleich behandelt und auf der Programmoberflaeche auch gleich dargestellt. Der Wiedererkennungseffekt vereinfacht es den Anwendern, sich schnell mit den Produkten anzufreunden. Alle

  13. Laplace transform in tracer kinetic modeling

    Energy Technology Data Exchange (ETDEWEB)

    Hauser, Eliete B., E-mail: eliete@pucrs.br [Instituto do Cerebro (InsCer/FAMAT/PUC-RS), Porto Alegre, RS, (Brazil). Faculdade de Matematica

    2013-07-01

    The main objective this paper is to quantify the pharmacokinetic processes: absorption, distribution and elimination of radiopharmaceutical(tracer), using Laplace transform method. When the drug is administered intravenously absorption is complete and is available in the bloodstream to be distributed throughout the whole body in all tissues and fluids, and to be eliminated. Mathematical modeling seeks to describe the processes of distribution and elimination through compartments, where distinct pools of tracer (spatial location or chemical state) are assigned to different compartments. A compartment model is described by a system of differential equations, where each equation represents the sum of all the transfer rates to and from a specific compartment. In this work a two-tissue irreversible compartment model is used for description of tracer, [{sup 18}F]2-fluor-2deoxy-D-glucose. In order to determine the parameters of the model, it is necessary to have information about the tracer delivery in the form of an input function representing the time-course of tracer concentration in arterial blood or plasma. We estimate the arterial input function in two stages and apply the Levenberg-Marquardt Method to solve nonlinear regressions. The transport of FDG across de arterial blood is very fast in the first ten minutes and then decreases slowly. We use de Heaviside function to represent this situation and this is the main contribution of this study. We apply the Laplace transform and the analytical solution for two-tissue irreversible compartment model is obtained. The only approach is to determinate de arterial input function. (author)

  14. An inexpensive field fluorometer for hydrogeological tracer tests with three tracers and turbidity measurement

    OpenAIRE

    Schnegg, Pierre-André

    2005-01-01

    The Geomagnetism Group of the University of Neuchâtel has recently designed a flow-through field fluorometer with added spectral capabilities for hydrological tracer tests. This instrument is equipped with four optical axes allowing water sample illumination with four independent light sources at different wavelenghs covering the full spectrum from UV to red. As many as three conveniently selected (dye) tracers can be simultaneously measured and separeted from a cocktail. Careful turbidity me...

  15. EVALUATION OF LEAKAGE FROM FUME HOODS USING TRACER GAS, TRACER NANOPARTICLES AND NANOPOWDER HANDLING TEST METHODOLOGIES

    OpenAIRE

    Dunn, Kevin H.; Tsai, Candace Su-Jung; Woskie, Susan R.; Bennett, James S.; Garcia, Alberto; Ellenbecker, Michael J.

    2014-01-01

    The most commonly reported control used to minimize workplace exposures to nanomaterials is the chemical fume hood. Studies have shown, however, that significant releases of nanoparticles can occur when materials are handled inside fume hoods. This study evaluated the performance of a new commercially available nano fume hood using three different test protocols. Tracer gas, tracer nanoparticle, and nanopowder handling protocols were used to evaluate the hood. A static test procedure using tr...

  16. Gas blower for use in potentially explosive atmosphere; Ventilatoren fuer den Einsatz in explosionsgefaehrdeten Bereichen

    Energy Technology Data Exchange (ETDEWEB)

    Frobese, D.-H.; Waldmann, R.

    1996-12-31

    The extension of emission control requirements during the last years lead to an increasing demand for blowers suited for the transport of explosive waste gas. Concerning hazardous explosive atmosphere which is classified as zone 1 or zone 2, the ``VDMA-Einheitsblaetter`` give guidance to appropriate constructional requirements for blowers. However, for zone 0-applications, there do not exist fixed construction requirements up til now. In the range of validity of the ``Verordnung fuer brennbare Fluessigkeiten - VbF`` a type approval is requested for blowers to be used for zone 0. Equipment intended for use in potentially explosive atmospheres will fall under the new Directive 94/9/EC (explosion protection directive) in future; equipment to be used for zone 0 will need an EC-type-examination certificate which shall be issued by a notified body in accordance to the Directive. (orig.) [Deutsch] Die zunehmende Erfassung von Anlagen durch emissionsrechtliche Anforderungen hat in den letzten Jahren zu einem immer groesseren Bedarf an Ventilatoren zur Foerderung von explosionsfaehiger Abluft gefuehrt. Fuer den Einsatz in explosionsgefaehrdeten Bereichen der Zonen 1 und 2 gelten VDMA-Einheitsblaetter, nach denen Ventilatoren konstruiert werden koennen; fuer den Einsatz im Bereich der Zone 0 hingegen existieren bislang keine festgelegten Konstruktionsanforderungen. Im Geltungsbereich der Verordnung ueber brennbare Fluessigkeiten (VbF) wird fuer den Einsatz in Zone 0 eine Bauartzulassung gefordert. Zukuenftig unterliegen Geraete, die in explosionsgefaehrdeten Bereichen eingesetzt werden, der neuen EG-Richtlinie 94/9/EG (Explosionsschutzrichtlinie), wonach fuer Geraete, die in Zone 0 eingesetzt werden, eine Baumusterpruefbescheinigung einer benannten Zertifizierstelle erforderlich ist. (orig.)

  17. PET tracers for somatostatin receptor imaging of neuroendocrine tumors

    DEFF Research Database (Denmark)

    Johnbeck, Camilla Bardram; Knigge, Ulrich; Kjær, Andreas

    2014-01-01

    Neuroendocrine tumors have shown rising incidence mainly due to higher clinical awareness and better diagnostic tools over the last 30 years. Functional imaging of neuroendocrine tumors with PET tracers is an evolving field that is continuously refining the affinity of new tracers in the search...... these PET tracers further....

  18. Natural tracer profiles across argillaceous formations

    Energy Technology Data Exchange (ETDEWEB)

    Mazurek, Martin, E-mail: mazurek@geo.unibe.ch [Rock-Water Interaction, Institute of Geological Sciences, University of Bern (Switzerland); Alt-Epping, Peter [Rock-Water Interaction, Institute of Geological Sciences, University of Bern (Switzerland); Bath, Adrian [Intellisci, Willoughby on the Wolds, Loughborough LE12 6SZ (United Kingdom); Gimmi, Thomas [Rock-Water Interaction, Institute of Geological Sciences, University of Bern (Switzerland)] [Paul Scherrer Institut, 5232 Villigen PSI (Switzerland); Niklaus Waber, H. [Rock-Water Interaction, Institute of Geological Sciences, University of Bern (Switzerland); Buschaert, Stephane [Andra, Parc de la Croix Blanche, 92298 Chatenay-Malabry Cedex (France); Canniere, Pierre De; Craen, Mieke De [SCK-CEN, 2400 Mol (Belgium); Gautschi, Andreas [Nagra, 5430 Wettingen (Switzerland); Savoye, Sebastien [IRSN, 92262 Fontenay-aux-Roses Cedex (France); Vinsot, Agnes [Andra, Parc de la Croix Blanche, 92298 Chatenay-Malabry Cedex (France); Wemaere, Isabelle [SCK-CEN, 2400 Mol (Belgium); Wouters, Laurent [Ondraf/Niras, 1210 Brussels (Belgium)

    2011-07-15

    Highlights: > Solute transport processes in clay and shale formations at nine sites are examined. > Conservative pore-water tracers (e.g. Cl{sup -}, {delta}{sup 18}O, {delta}{sup 2}H, He) show regular profiles. > These indicate the dominance of diffusive transport over times of 10{sup 5}-10{sup 6} years. > The contribution of vertical advection to transport is limited or negligible. > Modelled evolution times are in line with independent palaeo-hydrogeological data. - Abstract: Argillaceous formations generally act as aquitards because of their low hydraulic conductivities. This property, together with the large retention capacity of clays for cationic contaminants, has brought argillaceous formations into focus as potential host rocks for the geological disposal of radioactive and other waste. In several countries, programmes are under way to characterise the detailed transport properties of such formations at depth. In this context, the interpretation of profiles of natural tracers in pore waters across the formations can give valuable information about the large-scale and long-term transport behaviour of these formations. Here, tracer-profile data, obtained by various methods of pore-water extraction for nine sites in central Europe, are compiled. Data at each site comprise some or all of the conservative tracers: anions (Cl{sup -}, Br{sup -}), water isotopes ({delta}{sup 18}O, {delta}{sup 2}H) and noble gases (mainly He). Based on a careful evaluation of the palaeo-hydrogeological evolution at each site, model scenarios are derived for initial and boundary pore-water compositions and an attempt is made to numerically reproduce the observed tracer distributions in a consistent way for all tracers and sites, using transport parameters derived from laboratory or in situ tests. The comprehensive results from this project have been reported in . Here the results for three sites are presented in detail, but the conclusions are based on model interpretations of the

  19. Aluminum or steel? Mounting systems for solar generators - a practice report; Aluminium oder Stahl? Montagesysteme fuer Solargeneratoren - ein Praxisreport

    Energy Technology Data Exchange (ETDEWEB)

    Schnitzer, Sandy [Mounting Systems GmbH, Rangsdorf (Germany); Hannemann, Lydia

    2013-10-01

    Mounting systems for solar generators must be solid and reliable as long as possible so that they carry the modules. Which material is best? [German] Montagesysteme fuer Solargeneratoren muessen solide sein, damit sie moeglichst lange und zuverlaessig die Module tragen.

  20. Experiences with the use of conservative tracers as an aid in transferring lysimeter results to the open field; Erfahrungen beim Einsatz von konservativen Tracern als Hilfsmittel zur Uebertragung von Lysimeterergebnissen auf Freilandflaechen

    Energy Technology Data Exchange (ETDEWEB)

    Seeger, J.; Meissner, R.; Rupp, H. [UFZ - Umweltforschungszentrum Leipzig-Halle GmbH, Falkenberg (Germany). Lysimeterstation; Mueller, L.; Eulenstein, F. [Zentrum fuer Agrarlandschafts- und Landnutzungsforschung e.V. (ZALF), Muencheberg (Germany)

    1999-02-01

    Four lysimeter trials performed on an IS-type soil yielded an almost constant range of displacement of a tracer front (NO{sub 3} front) of 4.0 to 4.5 mm / l of seepage water (referred to a surface area of 1 m-2 and a depth of 1 m). This was experimental confirmation of a tentatively formulated simplified relationship between seepage water volume, vertical tracer displacement, and field capacity. The results were also in very good agreement with those of a control study in the open field carried out under similar hydrological, pedological, and agrotechnical conditions using lysimeters and Cl tracers for determining quantities of seepage water formation. As the present lysimeter trials mirror soil hydrological processes in the open field with sufficient accuracy, they appear well suited to take the place of the so often lacking territorial data as a means of validating mathematical models describing seepage-water-bound material export. [Deutsch] Auf der Basis von 4 Lysimeterversuchen konnte fuer die Bodenart IS ein nahezu konstanter Wertebereich fuer die Verlagerung einer Tracerfront (NO{sub 3}-Front) in Hoehe von 4,0 bis 4,5 mm/l Sickerwasser (bezogen auf eine Oberflaeche von 1 m{sup 2} und eine Tiefe von 1 m) ermittelt werden. Damit konnte die vereinfachte Beziehung zwischen Sickerwassermenge, Tracerverlagerungstiefe und Feldkapazitaet experimentell bestaetigt werden. Ein Vergleich zur Bestimmung der Sickerwassermengenbildung mit Hilfe von Lysimetern und durch Einsatz von Cl-Tracern unter aehnlich hydrologischen, pedologischen und agrotechnischen Bedingungen im Freiland wies eine hohe Uebereinstimmung auf. Da die hier durchgefuehrten Lysimeteruntersuchungen bodenhydrologische Prozesse von Freilandflaechen mit ausreichender Genauigkeit widerspieglen, erscheinen sie anstelle oft fehlender Gebietskenndaten zur Validierung von mathematischen Modellen zur Beschreibung sickerwassergebundener Stoffaustraege gut geeignet. (orig.)

  1. Feasibility study for new ecolabels according to ISO 14024 (type 1) within the product group: wood pellet heating systems; Machbarkeitsstudie fuer neue Umweltzeichen fuer die Produktgruppe: Holzpelletfeuerungen

    Energy Technology Data Exchange (ETDEWEB)

    Hoffmann, E.; Weiss, J.; Hirschl, B. [Institut fuer Oekologische Wirtschaftsforschung (IOEW) gGmbH, Berlin (Germany)

    2003-01-01

    This assessment is a feasibility study according to ISO 14024. It deals with the question whether an ecolabel is suitable for wood pellet heating systems and how concrete criteria for an ecolabel for wood pellet heating plants could be specified. The study begins with a comprehensive market analysis in order to identify possible plants for which an ecolabel would make sense. In the main part of the study, the environmental relevance of the chosen plants is analysed. For this analysis, plant manufacturers were interviewed and a comparison between wood pellet heating systems and heating systems which use gas, oil or wood was carried out. On the basis of this analysis, it was possible to derive a number of criteria which were discussed with company representatives and other experts in this field. As a result of this dialogue and the investigation process as a whole, the introduction of an ecolabel for wood pellet heating plants can be recommended. Wood pellet heating systems are characterized by their high level of automatation and the use of standardized fuels with constant high quality. Thus, they reach high combustion quality with low emission rates, and risks of misuse are minimized. They may contribute to the increased use of renewable energies and thereby to the achievement of climate protection goals. The proposed certification principles comprise requirements regarding (a) the efficient energy use (efficiency factor under partial load and nominal load, plant's supplementary energy consumption), (b) emission values for CO, NO{sub x}, dust and organic substances, (c) the offer of additional services, as well as (d) requirements with regard to the operating instructions. The transcription of the label is proposed as 'Ecolabel.. because low emission and energy-efficient'. (orig.) [German] Beim vorliegenden Gutachten handelt es sich um eine Machbarkeitsstudie nach ISO 14024. Es behandelt die Frage, ob ein Umweltzeichen fuer Holzpelletfeuerungen

  2. Stopping the flood of contracts. New standard contract for operators of solar power systems; Vertragsflut eindaemmen. Ein neuer Mustervertrag bietet Rechtssicherheit fuer Betreiber von Solarstromanlagen

    Energy Technology Data Exchange (ETDEWEB)

    Seltmann, T.

    2001-09-01

    The Deutsche Gesellschaft fuer Sonnenenergie and the Solarenergie-Foerderverein Aachen developed a new standard contract for operators of solar power systems. The new standard contract should be applied nation-wide. [German] Mit einem Mustervertrag wollen die Deutsche Gesellschaft fuer Sonnenenergie und der Solarenergie-Foerderverein Aachen den Stromnetzbetreibern bei ihrem Widerstand gegen den Solarstrom den Wind aus den Segeln nehmen. Ziel der Solarverbaende ist ein bundesweit einheitlicher Einspeisevertrag fuer Solarstrom. (orig.)

  3. Tracer Diffusion Mechanism in Amorphous Solids

    Directory of Open Access Journals (Sweden)

    P. K. Hung

    2011-01-01

    Full Text Available Tracer diffusion in amorphous solid is studied by mean of nB-bubble statistic. The nB-bubble is defined as a group of atoms around a spherical void and large bubble that represents a structural defect which could be eliminated under thermal annealing. It was found that amorphous alloys such as CoxB100−x (x=90, 81.5 and 70 and Fe80P20 suffer from a large number of vacancy bubbles which function like diffusion vehicle. The concentration of vacancy bubble weakly depends on temperature, but essentially on the relaxation degree of considered sample. The diffusion coefficient estimated for proposed mechanism via vacancy bubbles is in a reasonable agreement with experiment for actual amorphous alloys. The relaxation effect for tracer diffusion in amorphous alloys is interpreted by the elimination of vacancy bubbles under thermal annealing.

  4. Imaging techniques for ultrasonic testing; Bildgebende Verfahren fuer die Ultraschallpruefung

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2013-07-01

    - Klassische Anwendungen und neuere Entwicklungen der Ultraschall-Bildgebung; 3. Innovative abbildende Ultraschallverfahren in der Forschung und Applikation; 4. Industrielle Ultraschallpruefung geometrisch komplexer Faserverbundstrukturen; 5. Visualisierung von Rissspitzen bei der Pruefung von Radsatzwellen mit Laengsbohrung zur Vermeidung unnoetiger Radsatzwechsel; 6. Flaechige Analyse der Ausbreitung von Lamb-Wellen an gekruemmten, anisotropen Strukturen; 7. Hochaufloesende Darstellung bei der Pruefung in Tauchtechnik; 8. Varianten zur Bilderzeugung aus Phased Array Messdaten - Praktische Beispiele an Kupfer, CFK und anderen Materialien; 9. GIUM - ein unkonventionelles Verfahren der Mikrostrukturabbildung mit Ultraschallanregung und laservibrometrischer Abtastung; 10. Innovative Pruefkonzepte im Luftultraschall zur verbesserten Bildgebung; 11. Nutzung von bildgebenden Verfahren zur Verbesserung der zfP-Pruefaussage; 12.Modellierung und Visualisierung der EMUS-Anregung als Hilfsmittel zur Wandleroptimierung; 13. Anwendung von SAFT im Energiemaschinenbau; 14. Bildgebende Ultraschallpruefung zur verbesserten Fehlercharakterisierung bei der Schweissnahtpruefung von laengsnahtgeschweissten Grossrohren; 15. SAFT-Rekonstruktion fuer die Querfehlerpruefung in austenitischen Schweissnaehten und Mischnaehten; 16. Bildgebendes Optimierungsverfahren zur quantitativen US-Pruefung an anisotropen und inhomogenen austenitischen Schweissverbindungen mit Bestimmung und Nutzung der elastischen Eigenschaften. Ein Beitrag wurde separat aufgenommen.

  5. The medical applications of radioactive tracers

    Energy Technology Data Exchange (ETDEWEB)

    Hamilton, J.G.

    1947-12-31

    This report provides a broad yet in depth overview of the use of radioactive materials as tracers in medicine and biology for the period of 1935--1947. Particular attention is paid to is of radio-sodium, radio-iodine, radio-iron, radio-phosphorus, radio-strontium, and fission products. The main thrust of this paper is human rather than animal work and focuses in work that has been published.

  6. Molecules as tracers of galaxy evolution

    DEFF Research Database (Denmark)

    Costagliola, F.; Aalto, S.; I. Rodriguez, M.;

    2011-01-01

    We investigate the molecular gas properties of a sample of 23 galaxies in order to find and test chemical signatures of galaxy evolution and to compare them to IR evolutionary tracers. Observation at 3 mm wavelengths were obtained with the EMIR broadband receiver, mounted on the IRAM 30 m telesco...... detect the molecule in its vibrationally excited state.We find low HNC/HCN line ratios (...

  7. Very Massive Tracers and Higher Derivative Biases

    CERN Document Server

    Fujita, Tomohiro; Senatore, Leonardo; Vlah, Zvonimir; Angulo, Raul

    2016-01-01

    Most of the upcoming cosmological information will come from analyzing the clustering of the Large Scale Structures (LSS) of the universe through LSS or CMB observations. It is therefore essential to be able to understand their behavior with exquisite precision. The Effective Field Theory of Large Scale Structures (EFTofLSS) provides a consistent framework to make predictions for LSS observables in the mildly non-linear regime. In this paper we focus on biased tracers. We argue that in calculations at a given order in the dark matter perturbations, highly biased tracers will underperform because of their larger higher derivative biases. A natural prediction of the EFTofLSS is therefore that by simply adding higher derivative biases, all tracers should perform comparably well. We implement this prediction for the halo-halo and the halo-matter power spectra at one loop, and the halo-halo-halo, halo-halo-matter, and halo-matter-matter bispectra at tree-level, and compare with simulations. We find good agreement ...

  8. Tracer technology modeling the flow of fluids

    CERN Document Server

    Levenspiel, Octave

    2012-01-01

    A vessel’s behavior as a heat exchanger, absorber, reactor, or other process unit is dependent upon how fluid flows through the vessel.  In early engineering, the designer would assume either plug flow or mixed flow of the fluid through the vessel.  However, these assumptions were oftentimes inaccurate, sometimes being off by a volume factor of 100 or more.  The result of this unreliable figure produced ineffective products in multiple reaction systems.   Written by a pioneering researcher in the field of chemical engineering, the tracer method was introduced to provide more accurate flow data.  First, the tracer method measured the actual flow of fluid through a vessel.  Second, it developed a suitable model to represent the flow in question.  Such models are used to follow the flow of fluid in chemical reactors and other process units, like in rivers and streams, or solid and porous structures.  In medicine, the tracer method is used to study the flow of chemicals—harmful  and harmless—in the...

  9. Crystalline silicon for thin film solar cells. Final report; Kristallines Silizium fuer Duennschichtsolarzellen. Schlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Wagner, H.

    2001-07-01

    Thin film solar cells based on silicon are of great interest for cost-effective conversion of solar energy into electric power. In order to reach this goal, intensive research is still necessary, pointing, e.g., to a further enhancement of the conversion efficiency, an improvement of stability and a reduction of the production time. Aim of the project work was the achievement of knowledge on microcrystalline silicon and its application in thin film solar cells by means of a broad research and development program. Material research focused on growth processes of the microcrystalline material, the incorporation and stability of hydrogen, the electronic transport and defects. In particular the transition from amorphous to microcrystalline material which is obtained for the present deposition methods by minor variations of the deposition parameters as well as the enhancement of the deposition rate were intensively studies. Another focus of research aimed toward the development and improvement of zinc oxide films which are of central importance for this type of solar cells for the application as transparent contacts. A comprehensive understanding was achieved. The films were incorporated in thin film solar cells and with conversion efficiencies >8% for single cells (at relatively high deposition rate) and 10% (stable) for tandem cells with amorphous silicon, top values were achieved by international standards. The project achievements serve as a base for a further development of this type of solar cell and for the transfer of this technology to industry. (orig.) [German] Duennschichtsolarzellen auf der Basis von Silizium sind von grossem Interesse fuer eine kostenguenstige Umwandlung von Sonnenenergie in elektrischen Strom. Um dieses Ziel zu erreichen, ist jedoch noch intensive Forschung, u.a. zur weiteren Steigerung des Wirkungsgrades, zur Verbesserung der Stabilitaet und zur Verkuerzung des Produktionsprozesses erforderlich. Ziel der Projektarbeiten war, durch ein

  10. Asian Tracer Experiment and Atmospheric Modeling (TEAM) Project: Draft Field Work Plan for the Asian Long-Range Tracer Experiment

    Energy Technology Data Exchange (ETDEWEB)

    Allwine, K Jerry; Flaherty, Julia E.

    2007-08-01

    This report provides an experimental plan for a proposed Asian long-range tracer study as part of the international Tracer Experiment and Atmospheric Modeling (TEAM) Project. The TEAM partners are China, Japan, South Korea and the United States. Optimal times of year to conduct the study, meteorological measurements needed, proposed tracer release locations, proposed tracer sampling locations and the proposed durations of tracer releases and subsequent sampling are given. Also given are the activities necessary to prepare for the study and the schedule for completing the preparation activities leading to conducting the actual field operations. This report is intended to provide the TEAM members with the information necessary for planning and conducting the Asian long-range tracer study. The experimental plan is proposed, at this time, to describe the efforts necessary to conduct the Asian long-range tracer study, and the plan will undoubtedly be revised and refined as the planning goes forward over the next year.

  11. Solar building construction - new technologies; Solares Bauen - Neue Technologien fuer Gebaeude

    Energy Technology Data Exchange (ETDEWEB)

    Luther, J.; Voss, K.; Wittwer, V. [Fraunhofer-Inst. fuer Solare Energiesysteme, Freiburg (Germany). Abt. ``Thermische und Optische Systeme``

    1998-02-01

    There is an increasing demand for integrated building concepts in order to reduce energy consumption. Building design, construction and heating, ventilation and air-conditioning (HVAC) technology are decisive in this respect. Thus, an essentially higher energy efficiency is achieved and solar energy becomes the main energy source. An `active building envelope` assumes the task of controlling the energy flows between inside and outside. This paper reports on new components, system concepts and planning tools for solar building. (orig.) [Deutsch] Fuer zukuenftige Bauten werden in hohem Masse Forderungen nach integrierten Konzepten zur Begrenzung des Energieverbrauchs gestellt. Gestalt, Konstruktion und Klimatechnik sind dabei massgebliche Einflussfaktoren. Hierdurch wird eine wesentlich hoehere Energieeffizienz erzielt und Solarenergie kann die uebrigen Energiequellen zurueckdraengen. Eine `aktive Gebaeudehuelle` uebernimmt die Aufgabe, den Energiefluss zwischen Innen und Aussen zu steuern. Der Beitrag berichtet ueber neue Komponenten, Systemkonzepte und Planungswerkzeuge fuer das Solare Bauen. (orig.)

  12. Perspective of energy efficient engineering in other domains; Perspektiven fuer energieeffiziente Querschnittstechniken

    Energy Technology Data Exchange (ETDEWEB)

    Wagner, U.; Mauch, W.; Niedermeier, R.; Duschl, A.; Lilleike, J.; Megele, W.; Saller, A.; Arndt, U.; Mayr, R.; Carter, J.; Hellriegel, E. [Forschungsstelle fuer Energiewirtschaft (FfE), Muenchen (Germany)

    2003-07-01

    Section 8 of the IKARUS project comprised investigations of energy-intensive technologies by the Forschungsstelle fuer Energiewirtschaft e.V. (FfE) at Munich. This comprises technologies for energy use and energy conversion in the end use sector whose equipment, plants and systems are serially produced and are used in many sectors of industry. Pumps, for example, are used in industry, trade, households and public applications, e.g. for heating, materials transport etc. (orig.) [German] Im Teilvorhaben 8 des IKARUS-Projekts sind energieintensive Querschnittstechniken durch die der Forschungsstelle fuer Energiewirtschaft e.V. (FfE) in Muenchen untersucht worden. Unter Querschnittstechniken sind Techniken zur Energieanwendung und -umwandlung im Endenergiebereich zu verstehen, deren Anlagen, Geraete und Systeme serienmaessig hergestellt und branchenuebergreifend eingesetzt werden. Pumpen sind eine klassische Querschnittstechnik. Sie werden in Industrie, Kleinverbraucher, privaten Haushalten und oeffentlichen Einrichtungen in verschiedensten Anlagen wie z.B. Heizungsanlagen, Foerderanlagen etc. eingesetzt. (orig.)

  13. The internet as a chance for marketable telematic solutions; Das Internet als Chance fuer marktfaehige Telematikloesungen

    Energy Technology Data Exchange (ETDEWEB)

    Feldmann, R.; Heidemann, U. [ESC GmbH Co. KG, Grosswallstadt (Germany)

    2003-07-01

    The internet as a worldwide communication network with protocol standards provides new perspectives of success for in-vehicle telematic solutions. The internet is already part of the daily life. The question is not, whether vehicles will be connected to the internet but when and how the internet will be used inside the vehicle. Services for logistics, telemetry and tele diagnosis will be based on the same technology. For the in-vehicle services, safety and quality aspects must be considered. Ease of use is essential for safety, acceptance and market success. A new info-automatic mode combined with speech output offers new possibilities. A business model with shared risk takes care on solid portal financing. The traveltainer {sup registered}, an information, travel and entertainment magazine is one of the first products where this should be put into practice. (orig.) [German] Das Intenet, als weltweites Kommunikationsnetz mit Protokollstandards, bietet neue Chancen fuer die Telematik. Wenn auch nicht immer wahrnehmbar, das Internet gehoert laengst zum festen Bestandteil unseres Lebens. Die Frage ist deshalb nicht, ob Fahrzeuge internetfaehig werden, sondern wann und wie das Internet im Fahrzeug genutzt wird. Auf gleicher Basis werden auch Loesungen fuer Logistik, Telemetrie und Ferndiagnose realisiert werden. Fuer die Verwendung von Diensten im Fahrzeug muessen besondere Sicherheitsaspekte und Qualitaetsrichtlinien beruecksichtigt werden. Einfache Bedienbarkeit ist entscheidend fuer Fahrsicherheit, Akzeptanz und den Markterfolg. Eine Info-Automatik, kombiniert mit einer Sprachausgabe, eroeffnet vollkommen neue Moeglichkeiten. Die Portalfinanzierung soll ueber ein Businessmodell mit geteiltem Risiko erfolgen. Erstmals soll dieses im traveltainer {sup registered}, einem individuellen Reise-, Informations- und Unterhaltungsmagazin, umgesetzt werden. (orig.)

  14. Innovative inspection system for reactor pressure vessels; Innovative Pruefsysteme fuer Reaktordruckbehaelter

    Energy Technology Data Exchange (ETDEWEB)

    Mertens, K.; Trautmann, H.

    1999-08-01

    The versatile, compact and modern underwater systems described, the DELPHIN manipulators and MIDAS submarines, are innovative systems enabling RPV inspections at considerably reduced efforts and time, thus reducing the total time required for ISI of reactors. (orig./CB) [Deutsch] Die vorgestellten kleinen, flexiblen und modernen Schwimmsysteme (DELPHIN-Manipulatoren und MIDAS-U-Boote) sind innovative Systeme fuer die Reduzierung der Aufwaende und Zeit zur Pruefung des Reaktordruckbehaelters und damit zur Reduktion der Revisionszeiten der Reaktoranlagen. (orig.)

  15. CityFlux perfluorocarbon tracer experiments

    Science.gov (United States)

    Petersson, F. K.; Martin, D.; White, I. R.; Henshaw, S. J.; Nickless, G.; Longley, I.; Percival, C. J.; Gallagher, M.; Shallcross, D. E.

    2010-07-01

    In June 2006, two perfluorocarbon tracer experiments were conducted in central Manchester UK as part of the CityFlux campaign. The main aim was to investigate vertical dispersion in an urban area during convective conditions, but dispersion mechanisms within the street network were also studied. Paired receptors were used in most cases where one receptor was located at ground level and one at roof level. One receptor was located on the roof of Portland Tower which is an 80 m high building in central Manchester. Source receptor distances in the two experiments varied between 120 and 600 m. The results reveal that maximum concentration was sometimes found at roof level rather than at ground level implying the effectiveness of convective forces on dispersion. The degree of vertical dispersion was found to be dependent on source receptor distance as well as on building height in proximity to the release site. Evidence of flow channelling in a street canyon was also found. Both a Gaussian profile and a street network model were applied and the results show that the urban topography may lead to highly effective flow channelling which therefore may be a very important dispersion mechanism should the right meteorological conditions prevail. The experimental results from this campaign have also been compared with a simple urban dispersion model that was developed during the DAPPLE framework and show good agreement with this. The results presented here are some of the first published regarding vertical dispersion. More tracer experiments are needed in order to further characterise vertical concentration profiles and their dependence on, for instance, atmospheric stability. The impact of urban topography on pollutant dispersion is important to focus on in future tracer experiments in order to improve performance of models as well as for our understanding of the relationship between air quality and public health.

  16. CityFlux perfluorocarbon tracer experiments

    Directory of Open Access Journals (Sweden)

    F. K. Petersson

    2010-01-01

    Full Text Available In June 2006, two perfluorocarbon tracer experiments were conducted in central Manchester UK as part of the CityFlux campaign. The main aim was to investigate vertical dispersion in an urban area during convective conditions, but dispersion mechanisms within the street network were also studied. Paired receptors were used in most cases where one receptor was located at ground level and one at roof level. One receptor was located on the roof of Portland Tower which is an 80 m high building in central Manchester. Source receptor distances in the two experiments varied between 120 and 600 m.

    The results reveal that maximum concentration was sometimes found at roof level rather than at ground level implying the effectiveness of convective forces on dispersion. The degree of vertical dispersion was found to be dependent on source receptor distance as well as on building height in proximity to the release site.

    Evidence of flow channelling in a street canyon was also found. Both a Gaussian profile and a street network model were applied and the results show that the urban topography may lead to highly effective flow channelling which therefore may be a very important dispersion mechanism should the right meteorological conditions prevail.

    The experimental results from this campaign have also been compared with a simple urban dispersion model that was developed during the DAPPLE framework and show good agreement with this.

    The results presented here are some of the first published regarding vertical dispersion. More tracer experiments are needed in order to further characterise vertical concentration profiles and their dependence on, for instance, atmospheric stability. The impact of urban topography on pollutant dispersion is important to focus on in future tracer experiments in order to improve performance of models as well as for our understanding of the relationship between air quality and public health.

  17. CityFlux perfluorocarbon tracer experiments

    Directory of Open Access Journals (Sweden)

    F. K. Petersson

    2010-07-01

    Full Text Available In June 2006, two perfluorocarbon tracer experiments were conducted in central Manchester UK as part of the CityFlux campaign. The main aim was to investigate vertical dispersion in an urban area during convective conditions, but dispersion mechanisms within the street network were also studied. Paired receptors were used in most cases where one receptor was located at ground level and one at roof level. One receptor was located on the roof of Portland Tower which is an 80 m high building in central Manchester. Source receptor distances in the two experiments varied between 120 and 600 m.

    The results reveal that maximum concentration was sometimes found at roof level rather than at ground level implying the effectiveness of convective forces on dispersion. The degree of vertical dispersion was found to be dependent on source receptor distance as well as on building height in proximity to the release site.

    Evidence of flow channelling in a street canyon was also found. Both a Gaussian profile and a street network model were applied and the results show that the urban topography may lead to highly effective flow channelling which therefore may be a very important dispersion mechanism should the right meteorological conditions prevail.

    The experimental results from this campaign have also been compared with a simple urban dispersion model that was developed during the DAPPLE framework and show good agreement with this.

    The results presented here are some of the first published regarding vertical dispersion. More tracer experiments are needed in order to further characterise vertical concentration profiles and their dependence on, for instance, atmospheric stability. The impact of urban topography on pollutant dispersion is important to focus on in future tracer experiments in order to improve performance of models as well as for our understanding of the relationship between air quality and public health.

  18. Fuel cell technology for cogeneration systems. Symposium. Proceedings; Brennstoffzellen - Technologie fuer Blockheizkraftwerke. Symposium. Dokumentation

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2001-07-01

    This proceedings volume contains 11 papers on the following subject: Competence network 'Fuel Cells' in Nordrhein-Westfalen (D. Stolten, Juelich Research Center); Fuel cells in stationary applications (B. Hoehlein, Juelich Research Center); Functional principles of energy conversion in fuel cells (W. Schnurnberger, DLR); Low-temperature fuel cells AFC, PEMFC, PAFC (M. Waidhas, Siemens); High-temperature fuel cells - SOFC, MCFC (D. Stolten); Power plant options - natural gas, hydrogen, etc. (R. Wurster, Ludwig-Boelkow-Systemtechnik); Fuel cell supply (A. Heizel, ISE); Hydrogen-fuelled cogeneration units (G. Gummert Hamburg Gas Consult); SOFC high-temperature fuel cells for domestic power supply (R. Diethelm, Sulzer-Hexis); PEFC low-temperature fuel cells for domestic power supply (K. Klinder, Vaillant); Fuel cells, a chance for local utilities (B. Vogel, WINGAS). [German] Dieser Tagungsband enthaelt 11 Beitraege zu folgenden Themen: Kompetenznetzwerk Brennstoffzelle in NRW (D. Stolten, Forschungszentrum Juelich); Brennstoffzellen in der stationaeren Anwendung (B. Hoehlein, Forschungszentrum Juelich); Funktionsprinzipien der Energieumwandlung in Brennstoffzellen (W. Schnurnberger, DLR); Niedertemperaturbrennstoffzellen - AFC, PEMFC, PAFC (M. Waidhas, Siemens); Hochtemperaturbrennstoffzellen - SOFC, MCFC (D. Stolten); Kraftstoffoptionen- Erdgas, Wasserstoff u.a. (R. Wurster, Ludwig-Boelkow-Systemtechnik); Brennstoffbereitstellung (A. Heinzel, ISE); Wasserstoffbetriebene BHKW (G. Gummert Hamburg Gas Consult); Hochtemperaturbrennstoffzelle SOFC fuer die Hausenergieversorgung (R. Diethelm, Sulzer-Hexis); Niedertemperaturbrennstoffzelle PEFC fuer die Hausenergieversorgung (K. Klinder, Vaillant); Brennstoffzelle als Chance fuer lokale EVUs (B. Vogel, WINGAS).

  19. Power requirements of the Berlin-Hamburg maglev railway; Energiebedarf fuer die Magnetschnellbahn Berlin-Hamburg

    Energy Technology Data Exchange (ETDEWEB)

    Fuerst, R. [Transrapid International GmbH und Co. KG, Berlin (Germany)

    1999-04-01

    The paper describes the basic mode of operation of the Transrapid system, the design and construction of the drive system for the Berlin-Hamburg line and the efficiency profile between the power station and the air gap of the linear motor under the vehicle floor. After this introduction, the vehicle properties affecting the power requirements (components due to train resistance/auxiliary service supply) are discussed. Using these system parameters as a basis, the power requirements for the proposed mode of operation of the Berlin-Hamburg line are specified. (orig.) [German] Der Autor beschreibt zunaechst die prinzipielle Funktionsweise des Transrapid-Systems sowie den Aufbau und die Auslegung des Antriebs fuer die Strecke Berlin-Hamburg. Die Wirkungsgradkette vom Kraftwerk bis zum Luftspalt des Linearmotors unter den Fahrzeugen wird dargestellt. Anschliessend werden die fuer den Energiebedarf relevanten Eigenschaften der Fahrzeuge selbst (Fahrwiderstandsanteile/Eigenbedarf) besprochen. Mit diesen Systemparametern wird der Energiebedarf der Magnetschnellbahn Berlin-Hamburg fuer die geplante Betriebsweise dargestellt. (orig.)

  20. Power electronics for local fuel cell/-battery plants; Leistungselektronik fuer dezentrale Brennstoffzellen/-Batterieanlagen

    Energy Technology Data Exchange (ETDEWEB)

    Krykunov, Oleksandr

    2009-10-13

    With their high efficiency and modular structure, fuel cells are an attractive option for decentral power supply. An important component of decentral power supply systems is the power-electronic control element for supply of electric power from the fuel cell to the three-phase electricity grid. Control elements can be constructed of a unidirectional DC/DC converter with a current inverter connnected in series. The investigation focused on the development of the DC/DC converter with minimum constructional and control requirements and optimum adaption of the DC/DC converter to the characteristics of the fuel cell. (orig.) [German] Die Brennstoffzelle stellt mit ihrem hohen Wirkungsgrad und ihrem modularen Aufbau eine attraktive Option fuer die Verwendung in einem dezentralen Energieversorgungssystem dar. Eine wichtige Komponente des dezentralen Energieversorgungssystems sind die leistungselektronischen Stellglieder fuer die Einspeisung der elektrischen Energie aus der Brennstoffzelle in das dreiphasige Netz. Die leistungselektronischen Stellglieder koennen aus einem undirektionalen DC/DC-Wandler und einem nachgeschalteten Wechselrichter realisiert werden. Die Entwicklung des DC/DC-Wandlers mit einem moeglichst geringeren Bauelemente- und Steuerungsaufwand fuer diese leistungselektronischen Stellglieder und die Anpassung des DC/DC-Wandlers an die Eigenschaften der Brennstoffzelle war das Ziel dieser Arbeit. (orig.)

  1. Marketing for green building; Marketing fuer oekologisches Bauen. Ergebnisse einer Studie zum SynergieHaus-Projekt

    Energy Technology Data Exchange (ETDEWEB)

    Winkler, S.; Niedergesaess, U. [imug Beratungsgesellschaft mbH, Hannover (Germany)

    2001-03-12

    Ecological or green building becomes increasingly relevant in Germany. Of specific concern are the following questions that are considered more closely in the following article: Who are the customers or builder-owners of low energy houses? How to involve and motivate potential customers for this environmental form of building? What are the central motives in buying or building low energy houses and how to address private households with the issue of ecological building and living? These questions are discussed with reference to the results of a study carried out in the context of a specific green building sponsoring project named ''SynergieHaus''. (orig./CB) [German] Oekologisches Bauen gewinnt in Deutschland zunehmend an Bedeutung. Wer aber sind die Kaeufer bzw. Bauherren von Niedrigenergiehaeusern? Wie koennen Bauinteressenten fuer diese umweltorientierte Form des Bauens begeistert und gewonnen werden? Welches sind die zentralen Motive fuer den Kauf eines Niedrigenergiehauses bzw. wie koennen private Haushalte fuer oekologisches Bauen und Wohnen angesprochen werden? Diese marketingrelevanten Fragen werden in dem Beitrag naeher betrachtet anhand von Ergebnissen einer Studie zum SynergieHaus-Projekt. (orig./CB)

  2. Detection of tracer materials in the atmosphere

    Energy Technology Data Exchange (ETDEWEB)

    Jenkins, A.; Lovelock, J.E.

    1981-12-08

    As oxygen is an electron absorber it is desirable, when monitoring an atmospheric flow for the presence of tracer materials capable of detection in an electron capture detector, to remove the oxygen from the flow to the detector. The invention introduces a hydrogen supply directly into the atmospheric flow to allow the hydrogen to combine catalytically with the oxygen content of the flow to form water or water vapor. The thus formed water or water vapor is extracted from the flow proceeding to the detector. The reaction can occur within a palladium or palladium alloy conduit forming a part of the flow path to the detector.

  3. Tracer Dispersion in a Multi-compartment Structure

    CERN Document Server

    Skvortsov, A; Gamble, G; Roberts, M; Ilaya, O; Pitaliadda, D

    2012-01-01

    An experimental study of the tracer dispersion in a complex structure is presented. A point source of tracer (dyed salt) was placed inside a multi-compartment structure embedded in water tank. This experimental setting corresponds to a hazardous tracer release inside the engineering structure (building, ship, aircarft etc). A system of conductivity sensors was deployed to monitor the propagation of a tracer plume in the structure, including tracer trapping inside some compartments and its release to the outside environment through the external openings. The experimental data is processed by employing the ideas of scaling and self-similarity of underlying transport processes. The established and validated scaling laws provide a rigorous way to up-scale the results of laboratory modeling to real operational scenarios and can be used as an important step in the development of risk-assessment models for the first responders to hazardous releases. Keywords: hazardous plume, tracer dispersion, diffusion and advecti...

  4. Compilation and analyses of results from cross-hole tracer tests with conservative tracers

    Energy Technology Data Exchange (ETDEWEB)

    Hjerne, Calle; Nordqvist, Rune; Harrstroem, Johan (Geosigma AB (Sweden))

    2010-09-15

    Radionuclide transport in hydrogeological formations is one of the key factors for the safety analysis of a future repository of nuclear waste. Tracer tests have therefore been an important field method within the SKB investigation programmes at several sites since the late 1970's. This report presents a compilation and analyses of results from cross-hole tracer tests with conservative tracers performed within various SKB investigations. The objectives of the study are to facilitate, improve and reduce uncertainties in predictive tracer modelling and to provide supporting information for SKB's safety assessment of a final repository of nuclear waste. More specifically, the focus of the report is the relationship between the tracer mean residence time and fracture hydraulic parameters, i.e. the relationship between mass balance aperture and fracture transmissivity, hydraulic diffusivity and apparent storativity. For 74 different combinations of pumping and injection section at six different test sites (Studsvik, Stripa, Finnsjoen, Aespoe, Forsmark, Laxemar), estimates of mass balance aperture from cross-hole tracer tests as well as transmissivity were extracted from reports or in the SKB database Sicada. For 28 of these combinations of pumping and injection section, estimates of hydraulic diffusivity and apparent storativity from hydraulic interference tests were also found. An empirical relationship between mass balance aperture and transmissivity was estimated, although some uncertainties for individual data exist. The empirical relationship between mass balance aperture and transmissivity presented in this study deviates considerably from other previously suggested relationships, such as the cubic law and transport aperture as suggested by /Dershowitz and Klise 2002/, /Dershowitz et al. 2002/ and /Dershowitz et al. 2003/, which also is discussed in this report. No clear and direct empirical relationship between mass balance aperture and hydraulic

  5. Supply structures for electrical energy and heat from fuel cells; Versorgungsstrukturen fuer elektrische Energie und Waerme mit Brennstoffzellen

    Energy Technology Data Exchange (ETDEWEB)

    Asmuth, P.C.

    2007-07-01

    This dissertation was dedicated to the study of profit-optimised planning of supply structures for electrical energy and heat from fuel cells giving due consideration to conditions as are relevant to the planning of electricity networks. Various supply structures were drafted making use of all degrees of freedom, and the influence of the stand-alone operation of sub-networks powered by fuel cells on reliability of supply was analysed and its impact on network structure planning determined. In doing so a particular focus was placed on electricity networks. In terms of output the dissertation provides a set of planning principles for supply structures based on predominantly decentralised energy production from fuel cells. These principles are relevant to the development of new housing estates as well as for the development of target structures in fundamental planning. [German] Im Rahmen dieser Arbeit wurden Untersuchungen zur wirtschaftlich optimalen Planung von Versorgungsstrukturen fuer elektrische Energie und Waerme mit Brennstoffzellen unter Beruecksichtigung der fuer die Planung elektrischer Netze relevanten Randbedingungen durchgefuehrt. Zusaetzlich zu den Brennstoffzellen werden Speicher fuer elektrische Energie, fuer Waerme und fuer Gas, Umwandlungsanlagen zur H2-Gewinnung sowie Strukturen im elektrischen Netz, im Waermenetz sowie im Erdgas- und H2-Netz analysiert. Mit besonderem Fokus auf die elektrischen Netze werden erstmalig Kriterien zur Einhaltung einer Mindestversorgungszuverlaessigkeit als technische Randbedingung bei der Planung der MS- und NS-Netze mit Brennstoffzellen beruecksichtigt. Dafuer werden moegliche Inselnetzkonfigurationen des elektrischen Netzes mit Brennstoffzellen in Abhaengigkeit von verschiedenen Netzausfaellen konzipiert und der Ausfall der Gasversorgung ueber den Ausfall der Brennstoffzellen abgebildet. Darauf basierend wird der Einfluss des Inselbetriebes dieser Teilnetze mit Brennstoffzellen auf die Versorgungszuverlaessigkeit

  6. Performance Testing of Tracer Gas and Tracer Aerosol Detectors for use in Radionuclide NESHAP Compliance Testing

    Energy Technology Data Exchange (ETDEWEB)

    Fuehne, David Patrick [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lattin, Rebecca Renee [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2017-06-28

    The Rad-NESHAP program, part of the Air Quality Compliance team of LANL’s Compliance Programs group (EPC-CP), and the Radiation Instrumentation & Calibration team, part of the Radiation Protection Services group (RP-SVS), frequently partner on issues relating to characterizing air flow streams. This memo documents the most recent example of this partnership, involving performance testing of sulfur hexafluoride detectors for use in stack gas mixing tests. Additionally, members of the Rad-NESHAP program performed a functional trending test on a pair of optical particle counters, comparing results from a non-calibrated instrument to a calibrated instrument. Prior to commissioning a new stack sampling system, the ANSI Standard for stack sampling requires that the stack sample location must meet several criteria, including uniformity of tracer gas and aerosol mixing in the air stream. For these mix tests, tracer media (sulfur hexafluoride gas or liquid oil aerosol particles) are injected into the stack air stream and the resulting air concentrations are measured across the plane of the stack at the proposed sampling location. The coefficient of variation of these media concentrations must be under 20% when evaluated over the central 2/3 area of the stack or duct. The instruments which measure these air concentrations must be tested prior to the stack tests in order to ensure their linear response to varying air concentrations of either tracer gas or tracer aerosol. The instruments used in tracer gas and aerosol mix testing cannot be calibrated by the LANL Standards and Calibration Laboratory, so they would normally be sent off-site for factory calibration by the vendor. Operational requirements can prevent formal factory calibration of some instruments after they have been used in hazardous settings, e.g., within a radiological facility with potential airborne contamination. The performance tests described in this document are intended to demonstrate the reliable

  7. Magnesium - future material for automotive industry?; Magnesium - der Zukunftswerkstoff fuer die Automobilindustrie?

    Energy Technology Data Exchange (ETDEWEB)

    Dieringa, H.; Kainer, K.U. [GKSS Forschungszentrum GmbH, MagIC - Magnesium Innovation Center, Geesthacht (Germany)

    2007-02-15

    Magnesium alloys show a very high potential in automotive applications as constructive metal, whereas the main focus lies on die cast parts. Electronic industry is the major commercial consumer for die castings besides the automobile industry. Room temperature applications like steering wheels and frame components in cars as well as mobile phone- or notebook housings are well established. These castings are produced with AZ- or AM-magnesium alloys, which show good room temperature properties and a good castability. The great alloy development challenge in extending the use of magnesium cast alloys are application for higher temperatures. The application in powertrain components is considered to be the benchmark here. Besides alloy development there are also further research activities in development of casting processes. Semi-solid processes like New-Rheocasting (NRC), Thoxomolding trademark or Thixocasting (TC) are adapted to the requirements of newly developed alloys. Not only cast alloys but also magnesium wrought alloys have moved to the centre of interest in the last decade. Alloy development for improving the formability on the one hand as well as process development in extrusion or rolling has to be done in order to find optimum parameters for deforming magnesium alloys properly. (Abstract Copyright [2007], Wiley Periodicals, Inc.) [German] Magnesiumlegierungen weisen ein sehr hohes Potential fuer den Einsatz als metallischen Konstruktionswerkstoff fuer die Automobilindustrie auf, wobei der Anwendungsschwerpunkt bei Druckgussbauteilen liegt. Neben der Automobilindustrie ist die Elektroniksparte der wichtigste Abnehmer fuer Druckgussteile aus Magnesiumlegierungen. Raumtemperaturanwendungen wie z. B. Lenkraeder und Rahmenteile im Automobil oder Handy- und Notebookgehaeuse sind industriell gut eingefuehrt. Sie werden aus Magnesiumlegierungen der AZ- oder AM-Familie gegossen, die mit ihren guten Raumtemperatureigenschaften und der guten Giessbarkeit die

  8. How to chase a tracer - combining conventional salt tracer testing and direct push electrical conductivity profiling for enhanced aquifer characterization

    Science.gov (United States)

    Vienken, Thomas; Huber, Emanuel; Kreck, Manuel; Huggenberger, Peter; Dietrich, Peter

    2017-01-01

    Tracer testing is a well-established technique in hydrogeological site characterization. However, certain a priori knowledge of the hydraulic regime is required beforehand to avoid test failure, e.g. miss of tracer. In this study, we propose a novel tracer test concept for the hydraulic characterization of shallow unconsolidated sedimentary deposits when only scarce a priori information on the hydraulic regime is available. Therefore, we combine conventional salt tracer testing with direct push vertical high resolution electrical conductivity logging. The proposed tracer test concept was successfully tested on coarse, braided river deposits of the Tagliamento River, Italy. With limited a priori information available two tracer tests were performed in three days to reliably determine ground water flow direction and velocity allowing on-site decision-making to adaptively install observation wells for reliable breakthrough curve measurements. Furthermore, direct push vertical electrical profiling provided essential information about the plume characteristics with outstanding measurement resolution and efficiency.

  9. On the linearity of tracer bias around voids

    Science.gov (United States)

    Pollina, Giorgia; Hamaus, Nico; Dolag, Klaus; Weller, Jochen; Baldi, Marco; Moscardini, Lauro

    2017-07-01

    The large-scale structure of the Universe can be observed only via luminous tracers of the dark matter. However, the clustering statistics of tracers are biased and depend on various properties, such as their host-halo mass and assembly history. On very large scales, this tracer bias results in a constant offset in the clustering amplitude, known as linear bias. Towards smaller non-linear scales, this is no longer the case and tracer bias becomes a complicated function of scale and time. We focus on tracer bias centred on cosmic voids, i.e. depressions of the density field that spatially dominate the Universe. We consider three types of tracers: galaxies, galaxy clusters and active galactic nuclei, extracted from the hydrodynamical simulation Magneticum Pathfinder. In contrast to common clustering statistics that focus on auto-correlations of tracers, we find that void-tracer cross-correlations are successfully described by a linear bias relation. The tracer-density profile of voids can thus be related to their matter-density profile by a single number. We show that it coincides with the linear tracer bias extracted from the large-scale auto-correlation function and expectations from theory, if sufficiently large voids are considered. For smaller voids we observe a shift towards higher values. This has important consequences on cosmological parameter inference, as the problem of unknown tracer bias is alleviated up to a constant number. The smallest scales in existing data sets become accessible to simpler models, providing numerous modes of the density field that have been disregarded so far, but may help to further reduce statistical errors in constraining cosmology.

  10. Groundwater monitoring programme. A guide for groundwater sampling and analysis. 2. ed.; Grundwasserueberwachungsprogramm. Leitfaden fuer Probenahme und Analytik von Grundwasser

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2001-07-01

    Quality assurance guidelines have been developed and introduced in Baden-Wuerttemberg for groundwater monitoring. The contribution contains the fundamentals and technical guides for sampling and measurement of the Baden-Wuerttemberg groundwater monitoring programme, as well as parameter groups and a preliminary assessment of the methods. [German] Bei der Gewinnung von Umweltdaten sind hohe Anforderungen an die Qualitaet der erhobenen Daten zu stellen. Dies trifft in besonderem Masse gerade auch fuer Grundwasseruntersuchungen zu, da hier haeufig Konzentrationen im Bereich der Nachweisgrenze auftreten. Fuer das Grundwassermessnetz Baden-Wuerttemberg sind qualitaetssichernde Regelungen entwickelt und eingefuehrt worden. In der vorliegenden Zusammenstellung sind die Grundsatzpapiere, bzw. Technischen Anleitungen aus dem Grundwasserueberwachungsprogramm Baden-Wuerttemberg fuer die Grundwasserprobennahme sowie zu Messverfahren, Parametergruppen und zur ersten Beurteilung der Messergebnisse enthalten. (orig.)

  11. Star clusters as tracers of galaxy evolution

    CERN Document Server

    Konstantopoulos, Iraklis S

    2009-01-01

    Star clusters represent the most common 'mode' of star formation. They are found in all types of environments, cascading down from galaxy groups and merging pairs through starbursts to normal galaxies and dwarves and even isolated regions in extragalactic space. As they maintain a link to the overall star formation in a system, they can be used as tracers of the star formation history of environments located at distances prohibitive to the study of individual stars. This makes them ideally suited to the study of mergers and interactions in galaxy pairs and groups. In this work we present observations of the star cluster populations in the local starburst galaxy M82, post-interaction spiral NGC 6872, the "Antennae" merging pair and two compact groups, "Stephan's Quintet" and HCG 7. In each case, we extract information on the clusters and their hosts using mainly HST photometry and Gemini spectroscopy.

  12. Elemental tracers for Chinese source dust

    Institute of Scientific and Technical Information of China (English)

    张小曳; 张光宇; 朱光华; 张德二; 安芷生; 陈拓; 黄湘萍

    1996-01-01

    The mass-particle size distributions of 10 dust-carrying elements in aerosol particles were determined tor 12 sites in desert regions of northern China. The desert dust is proved to he of origin of eolian loess deposited on the Loess Plateau. Their transport to the loess was mainly attributable to the non-dust storm processes under the interglacial climate condition. The impact ot" dust storm on the accumulation of the loess increased in the glacial stage. On the basis of the signatures of 4 dust elements (Al. Fe, Mg and Sc). Chinese dust is believed to have 3 major desert sources (northwestern deserts, northern high dust deserts and northern low dust deserts). With a chemical element balance model, an elemental tracer system is established to proportion the export of China-source dust.

  13. Tracer studies of nitrogen assimilation in yeast.

    Science.gov (United States)

    ABRAMS, R; HAMMARSTEN, E

    1949-01-01

    By using N(15) as a tracer the assimilation of ammonia by the yeast, Torulopsis utilis, has been studied. It has been shown that: 1. There was no measurable incorporation of N in the protein or polynucleotide purine of carbon-starved yeast. 2. When ammonia is added to nitrogen-starved yeast there is a long lag period before division begins during which the yeast rapidly synthesizes protein, this process being accompanied by a turnover of polynucleotide purine. There was no significant dilution of the N(15)H(4) (+) of the medium by ordinary NH(4) (+). 3. When yeast containing N(15) is allowed to divide and grow in ordinary ammonia, the total amount of N(15) in the yeast remains constant. The dicarboxylic amino acids are most diluted, while arginine and nucleic acid guanine are not diluted at all.

  14. National Biomedical Tracer Facility. Project definition study

    Energy Technology Data Exchange (ETDEWEB)

    Schafer, R.

    1995-02-14

    We request a $25 million government-guaranteed, interest-free loan to be repaid over a 30-year period for construction and initial operations of a cyclotron-based National Biomedical Tracer Facility (NBTF) in North Central Texas. The NBTF will be co-located with a linear accelerator-based commercial radioisotope production facility, funded by the private sector at approximately $28 million. In addition, research radioisotope production by the NBTF will be coordinated through an association with an existing U.S. nuclear reactor center that will produce research and commercial radioisotopes through neutron reactions. The combined facilities will provide the full range of technology for radioisotope production and research: fast neutrons, thermal neutrons, and particle beams (H{sup -}, H{sup +}, and D{sup +}). The proposed NBTF facility includes an 80 MeV, 1 mA H{sup -} cyclotron that will produce proton-induced (neutron deficient) research isotopes.

  15. Urban Pollutant Transport and Infiltration into Buildings Using Perfluorocarbon Tracers

    Science.gov (United States)

    Matthews, James C.; Bacak, Asan; Khan, M. Anwar H.; Wright, Matthew D.; Priestley, Michael; Martin, Damien; Percival, Carl J.; Shallcross, Dudley E.

    2017-01-01

    People spend the majority of their time indoors and therefore the quality of indoor air is worthy of investigation; indoor air quality is affected by indoor sources of pollutants and from pollutants entering buildings from outdoors. In this study, unique perfluorocarbon tracers were released in five experiments at a 100 m and ~2 km distance from a large university building in Manchester, UK and tracer was also released inside the building to measure the amount of outdoor material penetrating into buildings and the flow of material within the building itself. Air samples of the tracer were taken in several rooms within the building, and a CO2 tracer was used within the building to estimate air-exchange rates. Air-exchange rates were found to vary between 0.57 and 10.90 per hour. Indoor perfluorocarbon tracer concentrations were paired to outdoor tracer concentrations, and in-out ratios were found to vary between 0.01 and 3.6. The largest room with the lowest air-exchange rate exhibited elevated tracer concentrations for over 60 min after the release had finished, but generally had the lowest concentrations, the room with the highest ventilation rates had the highest concentration over 30 min, but the peak decayed more rapidly. Tracer concentrations indoors compared to outdoors imply that pollutants remain within buildings after they have cleared outside, which must be considered when evaluating human exposure to outdoor pollutants. PMID:28230812

  16. Urban Pollutant Transport and Infiltration into Buildings Using Perfluorocarbon Tracers.

    Science.gov (United States)

    Matthews, James C; Bacak, Asan; Khan, M Anwar H; Wright, Matthew D; Priestley, Michael; Martin, Damien; Percival, Carl J; Shallcross, Dudley E

    2017-02-21

    People spend the majority of their time indoors and therefore the quality of indoor air is worthy of investigation; indoor air quality is affected by indoor sources of pollutants and from pollutants entering buildings from outdoors. In this study, unique perfluorocarbon tracers were released in five experiments at a 100 m and ~2 km distance from a large university building in Manchester, UK and tracer was also released inside the building to measure the amount of outdoor material penetrating into buildings and the flow of material within the building itself. Air samples of the tracer were taken in several rooms within the building, and a CO₂ tracer was used within the building to estimate air-exchange rates. Air-exchange rates were found to vary between 0.57 and 10.90 per hour. Indoor perfluorocarbon tracer concentrations were paired to outdoor tracer concentrations, and in-out ratios were found to vary between 0.01 and 3.6. The largest room with the lowest air-exchange rate exhibited elevated tracer concentrations for over 60 min after the release had finished, but generally had the lowest concentrations, the room with the highest ventilation rates had the highest concentration over 30 min, but the peak decayed more rapidly. Tracer concentrations indoors compared to outdoors imply that pollutants remain within buildings after they have cleared outside, which must be considered when evaluating human exposure to outdoor pollutants.

  17. On the linearity of tracer bias around voids

    CERN Document Server

    Pollina, Giorgia; Dolag, Klaus; Weller, Jochen; Baldi, Marco; Moscardini, Lauro

    2016-01-01

    The large-scale structure of the universe can only be observed directly via luminous tracers of the underlying distribution of dark matter. However, the clustering statistics of tracers are biased and depend on various properties of the tracers themselves, such as their host-halo mass and formation and assembly history. On very large scales, where density fluctuations are within the linear regime, this tracer bias results in a constant offset in the clustering amplitude, which is known as linear bias. Towards smaller non-linear scales, this is no longer the case and tracer bias becomes a complicated function of scale and time. We focus on tracer bias centered on cosmic voids, depressions of the density field that spatially dominate the universe. We consider three different types of tracers: galaxies, galaxy clusters and AGNs, extracted from the hydrodynamical simulation suite Magneticum Pathfinder. In contrast to common clustering statistics that focus on the auto-correlation of tracers, we find that void-tra...

  18. Toxicity of fluorescent tracers and their degradation byproducts

    Directory of Open Access Journals (Sweden)

    Philippe Gombert

    2017-01-01

    Full Text Available Tracer tests are frequently used to delineate catchment area of water supply springs in karstic zones. In the karstic chalk of Normandy, the main tracers used are fluorescent: uranine, sulforhodamine B, naphtionate, and Tinopal®. In this area, a statistical analysis shows that less than half of the injected tracers joins the monitored restitution points and enters the drinking water system where they undergo chlorination. Most of the injected tracers is absorbed in the rock matrix or is thrown out of the aquifer via karstic springs: then it can join superficial waters where it is degraded due to the sun and air action. The paper presents firstly the laboratory degradation of a first batch of fluorescent tracers in contact with chlorine, in order to simulate their passage through a water treatment system for human consumption. A second batch of the same tracers is subjected to agents of natural degradation: ultraviolet illumination, sunlight and air sparging. Most tracers is degraded, and toxicity and ecotoxicity tests (on rats, daphniae and algae are performed on degradation byproducts. These tests do not show any acute toxicity but a low to moderate ecotoxicity. In conclusion, the most used fluorescent tracers of the Normandy karstic chalk and their artificial and natural degradation byproducts do not exhibit significant toxicity to humans and the aquatic environment, at the concentrations generally noted at the restitution points.

  19. A teststand for photo detectors and beamtests for ILC polarimetry; Aufbau eines Teststandes fuer Photodetektoren und Teststrahlmessungen fuer die Strahlpolarisationsmessung am ILC

    Energy Technology Data Exchange (ETDEWEB)

    Velte, Ulrich

    2009-02-15

    -Lichts charakterisiert und auf ihre Eignung fuer die spezielle Anwendung im ILC-Polarimeter ueberprueft werden koennen. Die bislang beste Polarisationsmessung wurde im Rahmen des SLD-Experimentes am SLAC in Kalifornien erreicht ({delta}P/P{approx}0.5%). Zur Zeit befindet sich der Cerenkov-Detektor des SLD-Polarimeters am DESY und wird dort benutzt, um verschiedene fuer die ILC-Polarimetrie in Frage kommende Photodetektoren im Teststrahl zu vermessen. Um an die Erfahrungen aus dem SLD-Experiment anknuepfen zu koennen, werden im Rahmen dieser Arbeit Teststrahlmessungen am Cerenkov-Detektor, ausgewertet und die ersten Entwicklungen hin zu einem Polarimeter fuer den ILC beschrieben. (orig.)

  20. Development of radio tracers for the radiopharmaceutical characterization of Eph receptors; Entwicklung von Radiotracern fuer die radiopharmakologische Charakterisierung von Eph-Rezeptoren

    Energy Technology Data Exchange (ETDEWEB)

    Pretze, Marc

    2014-06-17

    In the frame of the thesis fundamental work was performed for two F-18 fluorination agents including a trial to use small molecules as radiotracers. Peptide and small molecules ware labeled with F-18 that are based on selective extra and intra cellular inhibitors foe Eph receptors. Eph receptors are supposed to be an adequate target for tumor diagnostics and therapy. The new potential radiotracer shows high in vitro stability (rat plasma) and was tested with melanoma cell lines. The used peptide sequences are discussed in detail.

  1. Characterization of an alluvial aquifer with thermal tracer tomography

    Science.gov (United States)

    Somogyvári, Márk; Bayer, Peter

    2017-04-01

    In the summer of 2015, a series of thermal tracer tests was performed at the Widen field site in northeast Switzerland. At this site numerous hydraulic, tracer, geophysical and hydrogeophysical field tests have been conducted in the past to investigate a shallow alluvial aquifer. The goals of the campaign in 2015 were to design a cost-effective thermal tracer tomography setup and to validate the concept of travel time-based thermal tracer tomography under field conditions. Thermal tracer tomography uses repeated thermal tracer injections with different injection depths and distributed temperature measurements to map the hydraulic conductivity distribution of a heterogeneous aquifer. The tracer application was designed with minimal experimental time and cost. Water was heated in inflatable swimming pools using direct sunlight of the warm summer days, and it was injected as low temperature pulses in a well. Because of the small amount of injected heat, no long recovery times were required between the repeated heat tracer injections and every test started from natural thermal conditions. At Widen, four thermal tracer tests were performed during a period of three days. Temperatures were measured in one downgradient well using a distributed temperature measurement system installed at seven depth points. Totally 12 temperature breakthrough curves were collected. Travel time based tomographic inversion assumes that thermal transport is dominated by advection and the travel time of the thermal tracer can be related to the hydraulic conductivities of the aquifer. This assumption is valid in many shallow porous aquifers where the groundwater flow is fast. In our application, the travel time problem was treated by a tomographic solver, analogous to seismic tomography, to derive the hydraulic conductivity distribution. At the test site, a two-dimensional cross-well hydraulic conductivity profile was reconstructed with the travel time based inversion. The reconstructed profile

  2. Radiopharmaceuticals for diagnosis of inflammation; Radiopharmaka fuer die Entzuendungsdiagnostik

    Energy Technology Data Exchange (ETDEWEB)

    Meller, B.; Baehre, M. [Luebeck Univ. (Germany). Klinik fuer Radiologie und Nuklearmedizin

    2007-06-15

    Inflammations represent mediator-induced reactions of the hematopoetic-immunologic cell system resulting from exogenous or endogenous stimuli. On cellular level, an increased expression of inflammatory genes is followed by the release of several mediators. As inflammatory response vascular permeability increases and interstitial oedema develops. Additionally, white blood cells emigrate and several transduction cascades are activated. Radiopharmaceuticals for inflammation scintigraphy should specifically reflect one or several aspects of inflammation pathophysiology on molecular level. A group of elder tracers for this purpose comprised substances that are accumulated due to the permeability of physiological barriers. However, their property to accumulate in all processes with increased vascular permeability results in a comparably low specificity of these methods. In-vitro-labelled granulocytes were the method of choice for scintigraphic imaging of inflammation for years. Investigations with {sup 111}In-labelled granulocytes are still frequently considered as the gold standard to detect inflammation by scintigraphy. The use of antibodies or antibody fragments directed against leucocytes allowed in vivo labelling and substituted more complex techniques of in vitro labelling despite of several disadvantages. Due to the superior imaging quality of positron emission tomography, [{sup 18}F]FDG-labelled leucocytes might result in a renaissance of in vitro methods. In cases of cerebral inflammation, activated microglia was visualised by its increased expression of benzodiazepin receptors. An interesting approach to differentiate between infection and sterile inflammation could be the use of bacterial gyrase inhibitors labelled with radioactive compounds. At present, specificity of this method is still controversially discussed. In search of substances to visualise inflammatory transduction cascades selectively, several chemotactic and chemokinetic cytokines, metabolites

  3. Methods and systems using encapsulated tracers and chemicals for reservoir interrogation and manipulation

    Energy Technology Data Exchange (ETDEWEB)

    Roberts, Jeffery; Aines, Roger D; Duoss, Eric B; Spadaccini, Christopher M

    2014-11-04

    An apparatus, method, and system of reservoir interrogation. A tracer is encapsulating in a receptacle. The receptacle containing the tracer is injected into the reservoir. The tracer is analyzed for reservoir interrogation.

  4. Future propulsion systems and fuels; Antriebe und Kraftstoffe fuer die Zukunft

    Energy Technology Data Exchange (ETDEWEB)

    Huss, C. [Wissenschafts- und Verkehrspolitik, BMW Group, Muenchen (Germany)

    2002-12-01

    Nutzung weltweit unangefochten die Fuehrungsrolle erlangt. Fuer konventionelle Antriebe und Kraftstoffe wurde dabei ein hoher Standard erreicht, der sich durch optimierte Verbrennung, aufwaendige Abgasnachbehandlung und dementsprechend niedrige klassische Abgasemissionen auszeichnet. Die Abhaengigkeit von den eingeschraenkt verfuegbaren Oelvorkommen sowie die Nachteile bei der Verbrennung fossiler Energietraeger infolge von Treibhausgasemissionen haben die Diskussion zu diesen bislang als optimal angesehenen Kraftstoffen intensiviert. Entsprechend wird nach anderen Kraftstoffen bzw. Antriebsformen fuer den Strassenverkehr gesucht. Einbezogen werden dabei oekologische und oekonomische Kriterien sowie die Ressourcenverfuegbarkeit zur Erzielung eines Gesamtoptimums des Kraftstoffsystems. Schluessel zur 'Entkarbonisierung' des Kraftstoffes kann langfristig der Einsatz von Wasserstoff als Treibstoff sein - unter der Voraussetzung einer insgesamt emissionsarmen Erzeugungskette fuer die Bereitstellung des Wasserstoffs. Die Entwicklung an Wasserstoff-Fahrzeug-Prototypen bei BMW wird seit 20 Jahren verfolgt. Mit dem BMW 750hL konnte im Jahr 2000 eine seriennahe Flotte von 15 fahrbereiten Pkw aufgebaut werden. Im Jahr 2001 stellte BMW mit der Modellreihe 745h die sechste Generation vor und damit ein erstmals unter seriennahen Bedingungen entwickeltes Fahrzeug. Alle Fahrzeug-Serien sind mit einem Wasserstoff-Kryotank ausgestattet und fuer bivalenten Betrieb ausgelegt (Wasserstoff/Benzin). Wesentliche technische Entwicklungsaufgabe ist die Speicherung des Kraftstoffes Wasserstoff. Aufgrund seiner physikalisch-chemischen Eigenschaften sind moderne Kryo-Tanks fuer Fluessigwasserstoff entwickelt worden. Im Rahmen der Verkehrswirtschaftlichen Energiestrategie haben sich fuehrende Unternehmen mit Unterstuetzung der Bundesregierung zusammengeschlossen, um an einer konzertierten Einfuehrungsstrategie fuer den Kraftstoff Wasserstoff zu arbeiten. (orig.)

  5. Water emission inventory for the Federal Republic of Germany; Emissionsinventar Wasser fuer die Bundesrepublik Deutschland

    Energy Technology Data Exchange (ETDEWEB)

    Boehm, E.; Hillenbrand, T.; Marscheider-Weidemann, F.; Schempp, C. [Fraunhofer-Institut fuer Systemtechnik und Innovationsforschung (ISI), Karlsruhe (Germany); Fuchs, S.; Scherer, U. [Karlsruhe Univ. (T.H.) (Germany). Inst. fuer Siedlungswasserwirtschaft; Luettgert, M. [RISA Sicherheitsanalysen GmbH, Berlin (Germany)

    2000-11-01

    Within the frame of this project, a concept for setting up exemplary emission inventories for water was put forward. An overview is given of the international activities on emission inventories and the status of national emission inventories. Based on the data situation in Germany, it was necessary to include both plant-specific, aggregated and calculated data of the point sources in the inventories. Due to their increasing significance, diffuse material emissions into water were also taken into account. Based on the conceptual work, exemplary emission inventories were compiled for nitrogen, phosphorous and adsorbable organic combined halides (AOX) as well as the heavy metals arsenic, cadmium, chrome, copper, mercury, nickel, lead and zinc. These were evaluated according to the areas of origin (sectors) or the emission paths as well as according to the large river basins Danube, Rhine, Ems, Weser, Elbe, Oder, North Sea and Baltic Sea. In addition, lists of the ten largest industrial direct dischargers were compiled. (orig.) [German] Im Rahmen dieses Vorhabens wurde ein Konzept fuer die Erstellung von beispielhaften Emissionsinventaren fuer Gewaesser erarbeitet. Es wird ein Ueberblick ueber die internationalen Aktivitaeten zu Emissionsinventaren und den Stand beim Aufbau von nationalen Emissionsinventaren gegeben. Auf Grund der Datensituation in Deutschland war es erforderlich, dass sowohl anlagenspezifische als auch aggregierte sowie berechnete Daten der Punktquellen in die Inventare einbezogen wurden. Wegen ihrer zunehmenden Bedeutung werden die diffusen Stoffeintraege in die Gewaesser ebenfalls beruecksichtigt. Aufbauend auf den konzeptionellen Arbeiten wurden beispielhafte Emissionsinventare fuer Stickstoff, Phosphor und adsorbierbare organisch gebundene Halogene (AOX) sowie die Schwermetalle Arsen, Cadmium, Chrom, Kupfer, Quecksilber, Nickel, Blei und Zink zusammengestellt. Die Auswertung erfolgte sowohl nach den Herkunftsbereichen (Branchen) bzw. den

  6. New applications of natural oils and fats II. Subproject 2.1 and 2.3. Olefin metathesis and selective oxidation of unsaturated fatty compounds. Final report; Neue Einsatzmoeglichkeiten natuerlicher Oele und Fette II. Teilprojekt 2.1 und 2.3. Industriechemikalien durch Olefin-Metathese oleochemischer Verbindungen und Selektivoxidationen ungesaettigter Fettstoffe durch Metallkomplexkatalyse. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Warwel, S.; Ercklentz, B.; Fischer, S.; Hoffmann, A.; Kaiser, W.; Tillack, J.; Thomas, S.; Bavaj, P.; Deckwirth, E.A.; Ruesch genannt Klaas, M.; Wolff, B.

    1994-07-01

    Metathesis: New high effective catalysts (B{sub 2}O{sub 3}-Re{sub 2}O{sub 7}/Al{sub 2}O{sub 3}-SiO{sub 2} + SnBu{sub 4} and MeReO{sub 3} + B{sub 2}O{sub 3}-Al{sub 2}O{sub 3}-SiO{sub 2}) were developed for the metathesis of unsaturated fatty acid esters. They were used for the synthesis of {omega} unsaturated esters, middle-chained esters, branched esters, dicarboxylic acid esters and pre-pheromones. The metathesis of unsaturated esters with ethylene was tested successfully in a continuous miniplant. Selective oxidations: unsaturated fatty acid esters were converted to keto fatty acid esters catalysed by PdSO{sub 4}/heteropoly acid using O{sub 2} or H{sub 2}O{sub 2}. By Ruthenium catalysis/peracetic acid or Re{sub 2}O{sub 7}/H{sub 2}O{sub 2} the oxidative C=C-cleavage to dicarboxylic acids was achieved. Oleochemical di- and polyols were produced by tungsten- and rhenium-catalysis and H{sub 2}O{sub 2}. (orig.) [Deutsch] Olefin-Metathese: Fuer die Metathese ungesaettigter Fettsaeureester wurden mit B{sub 2}O{sub 3}-Re{sub 2}O{sub 7}/Al{sub 2}O{sub 3}-SiO{sub 2} + SnBu{sub 4} und MeReO{sub 3} + B{sub 2}O{sub 3}-Al{sub 2}O{sub 3}-SiO{sub 2} neue hochaktive Katalysatoren entwickelt und fuer Synthesen von {omega}-ungesaettigten Estern, mittelkettigen Estern, verzweigten Estern sowie fuer Dicarbonsaeuren und Pheromonvorstufen genutzt. Die Metathese ungesaettigter Ester mit Ethylen wurde erfolgreich in kontinuierlicher Fahrweise in einer Miniplant erprobt. Selektivoxidationen: ungesaettigte Fettsaeureester wurden unter Katalyse von PdSO{sub 4}/Heteropolysaeure mit O{sub 2} oder H{sub 2}O{sub 2} in Ketofettsaeuren ueberfuehrt. Mit Ru.-Kat./Peressigsaeure bzw. Re{sub 2}O{sub 7}/H{sub 2}O{sub 2} gelang die oxidative C=C-Spaltung zu Dicarbonsaeuren. Fettchemische Di- und Polyole wurden wolfram- und rheniumkatalysiert mittels H{sub 2}O{sub 2} erhalten. (orig.)

  7. Mines 2012 - high-tech for the future; Bergwerk 2012 - Hightech fuer die Zukunft

    Energy Technology Data Exchange (ETDEWEB)

    Toenjes, B. [Deutsche Steinkohle AG, Herne (Germany)

    2003-12-18

    Successful coal mining in 2012 and beyond will require technical as well as non-technical progress. Mines will look different from today's mines. The author presents some innovative technologies. [German] Zusaetzlich zu allen zwingend erforderlichen nicht-technischen Massnahmen werden wir auch technische Fortschritte machen muessen, um im Jahr 2012 und darueber hinaus erfolgreich Kohle gewinnen zu koennen. Das Bergwerk 2012 wird anders aussehen als heute, und hierzu gibt es auch realistische Chancen, die ich aufzeigen moechte. Dabei werde ich den Blick besonders auf innovative Technik lenken, als Basis und Voraussetzung fuer den erforderlichen weiteren Produktivitaets- und Kostenfortschritt. (orig.)

  8. Ecological balance for supermarket refrigeration in Switzerland; Oekobilanz fuer Supermarkt-Kaelteanlagen in der Schweiz

    Energy Technology Data Exchange (ETDEWEB)

    Frischknecht, R. [ESU-services, Uster (Switzerland)

    2000-04-01

    In the context of an ecological balance of heat pumps and refrigeration plants for the area supermarket cooling was stated that in respect of the environmental the greenhouse effect and ozone depletion give first priority to the selection of the refrigerant and the consistent minimization of the losses of refrigerant. The monitoring of the losses of refrigerant can be strongly improved. (orig.) [German] Im Rahmen einer Oekobilanz von Waermepumpen und Kaelteanlagen wurde fuer den Bereich Supermarktkaelte festgestellt, dass bei den Umweltwirkungen Treibhauseffekt und Ozonschichtabbau der Wahl des Kaeltemittels und der konsequenten Minimierung der Kaeltemittelverluste erste Prioritaet zukommt. Das Monitoring der Kaeltemittelverluste ist stark verbesserungsfaehig. (orig.)

  9. Nephrogenic systemic fibrosis (NSF) - implications for radiology; Nephrogene systemische Fibrose (NSF) - Implikationen fuer die Radiologie

    Energy Technology Data Exchange (ETDEWEB)

    Michaely, H.J.; Schoenberg, S.O. [Klinikum Mannheim der Universitaet Heidelberg, Institut fuer Klinische Radiologie, Mannheim (Germany); Klinikum Grosshadern der Ludwig-Maximilians-Universitaet Muenchen, Institut fuer Klinische Radiologie, Muenchen (Germany); Thomsen, H.S. [Copenhagen University, Hospital at Herlev, Kopenhagen (Denmark); Reiser, M.F. [Klinikum Grosshadern der Ludwig-Maximilians-Universitaet Muenchen, Institut fuer Klinische Radiologie, Muenchen (Germany)

    2007-09-15

    Nephrogenic systemic fibrosis (NSF) is a systemic disease with a 5% mortality which was first described in 1997 and which only occurs in patients with severely impaired renal function (GFR <30 ml/min per 1.73 m{sup 2}) and for which an association with previous administration of several Gd-chelates has been observed. According to retrospective case control studies the odds ratio for a patient with severely impaired renal function to develop NSF was increased by a factor of 22-32 when gadodiamide was administered. At this time there are approximately 250 confirmed cases of NSF of which 177 are associated with the administration of gadodiamide and 78 are associated with gadopentetate dimeglumine. This review article elucidates the postulated pathogenesis of NSF and provides an overview of the published statements and recommendations from international regulatory authorities and from international advisory boards. Even though the pathogenesis is not completely understood at this time, the European Pharmacovigilance Working Party has decided that gadodiamide and gadopentetate dimeglumine must not be used in high-risk patients. Other Gd-containing contrast agents should only be administered after thorough assessment of the indication and with minimized Gd dose. In the USA, the FDA has issued a black box warning for Gd-containing contrast agents. (orig.) [German] Die nephrogene systemische Fibrose (NSF) ist eine 1997 erstmals beschriebene systemische Erkrankung mit einer 5%igen Mortalitaet, die bislang ausschliesslich bei Patienten mit terminaler Niereninsuffizienz (glomerulaere Filtrationsrate [GFR] <30 ml/min/1,73 m{sup 2}) aufgetreten ist und fuer die eine Assoziation mit der vorherigen Verabreichung verschiedener Gadolinium- (Gd-)haltiger MR-Kontrastmittel beobachtet wurde. Laut retrospektiver Fall-Kontroll-Studien war die Odds Ratio fuer die Entwicklung einer NSF bei Patienten mit stark eingeschraenkter Nierenfunktion 22- bis 32-fach hoeher, wenn Gadodiamid

  10. Geared turbomachine for new markets; Getriebe-Turbomaschine fuer neue Maerkte

    Energy Technology Data Exchange (ETDEWEB)

    Faller, W. [Sulzer Turbo GmbH, Ravensburg (Germany)

    1998-07-01

    A number of turbomachines are required to produce nitric acid. In the case of small plants, these machines represent a substantial investment factor. A combination of proven air compressor modules with newly developed expansion turbines and nitrose gas compressors on a single gearbox provides a new, low-cost alternative and gives the plant contractor useful potential for optimization of his facilities. (orig.) [Deutsch] Fuer die Erzeugung von Salpetersaeure sind mehrere Turbomaschinen erforderlich, die bei kleinen Anlagen einen erheblichen Investitionsfaktor darstellen. Eine Kombination von erprobten Luftverdichtermodulen mit neu entwickelten Entspannungsturbinen und Nitrosegasverdichtern an einem einzigen Getriebe bietet eine neue, kostenguenstige Alternative und eroeffnet dem Anlagenbauer interessante Moeglichkeiten zur Anlagenoptimierung. (orig.)

  11. Ceramic brake disks for mobile applications; Keramik-Bremsscheiben fuer den mobilen Einsatz

    Energy Technology Data Exchange (ETDEWEB)

    Bartsch, C.

    2001-07-01

    In 2000, Daimler-Chrysler and Porsche introduced the first braking disks made of ceramic fibres, while Knorr developed similar disks to maturity for railway applications. The first series were small but the next ones will be bigger. [German] Im letzten Jahr fuehrten Daimler-Chrysler und Porsche die ersten Bremsscheiben aus Faserkeramik in den Automobilbau ein, waehrend Knorr solche Scheiben fuer die Bahn zur Serienreife entwickelte. Es handelt sich zunaechst um in kleinen Stueckzahlen gefertigte Serien. Der naechste Schritt ist die Einrichtung der Grossserienfertigung. (orig.)

  12. Transparency in power supply. Obligatory information on power sources in Germany and other countries; Transparenz fuer die Steckdose. Kennzeichnungspflicht fuer den Strommix: Einige Laender kennen sie bereits, und in Deutschland werden die Forderungen lauter

    Energy Technology Data Exchange (ETDEWEB)

    Janzing, B.

    2001-07-01

    In California, it is obligatory for utilities to provide information on the sources of electric power. Austria will follow in October, and there is increasing pressure in Germany to introduce this option. [German] Auch in Deutschland werden die Forderungen nach einer Kennzeichnungspflicht fuer den Strommix immer lauter. In Kalifornien ist das bereits Standard, Oesterreich folgt im Oktober. (orig.)

  13. 48. Annual meeting of the Deutsche Gesellschaft fuer Neuroradiologie. Joint annual meeting of the DGNR and OeGNR. Abstracts; 48. Jahrestagung der Deutschen Gesellschaft fuer Neuroradiologie. Gemeinsame Jahrestagung der DGNR und OeGNR. Abstracts

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2013-09-15

    The conference proceedings of the 48. Annual meeting of the Deutsche Gesellschaft fuer Neuroradiologie contain abstracts on the following issues: neuro-oncological imaging, multimodal imaging concepts, subcranial imaging, spinal codes, interventional neuroradiology, innovative techniques like high-field MRT and hybrid imaging methods, inflammable and metabolic central nervous system diseases and epilepsy.

  14. Deregulation of German gas supply networks. Free choice for private households and trade from 2001; Deutschland oeffnet die Netze. Wahlfreiheit fuer private Haushalte/Gewerbe ab naechstem Jahr

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2000-08-01

    This contribution is the first part of a series of articles on deregulation of the gas market. Part 2 will be published in September and will discuss the consequences for private households and trade. [German] Die Gasmarkt-Liberalisierung ist derzeit in aller Munde. Am 4. Juli unterschrieben die Versorger und die Grossabnehmer gemeinsam die Regularien. Durchleitung, Verbaendevereinbarung, europaeischer Binnenmarkt fuer Gas lauten die Schlagworte. Worum geht es dabei? Die Sanitaer- und Heizungstechnik beleuchtet in diesem ersten Teil einer zweiteiligen Folge den Wandel der Gasbranche. Der zweite Teil in der September-Ausgabe wird auf die Konsequenzen fuer die Haushaltsversorgung beziehungsweise fuer das Handwerk eingehen. (orig.)

  15. Tracer diffusivity and effective temperature in bacterial suspensions

    CERN Document Server

    Patteson, Alison E; Purohit, Prashant K; Arratia, Paulo E

    2015-01-01

    The dynamics of tracer particles in \\textit{E. coli} suspensions are experimentally investigated as a function of particle size and bacteria concentration. We find that tracer diffusivity is enhanced due to particle-bacteria interactions and varies non-monotonically with particle size, exhibiting a peak at sizes comparable to the bacterial length. The time scale characterizing the transition from ballistic to diffusive regime increases monotonically with \\textit{E. coli} concentration and particle size. Diffusivity measurements are then used to estimate suspension effective temperature, which varies nonlinearly with tracer size, suggesting that measures of activity are probe size dependent.

  16. Radionuclide Tracers for Myocardial Perfusion Imaging and Blood Flow Quantification.

    Science.gov (United States)

    deKemp, Robert A; Renaud, Jennifer M; Klein, Ran; Beanlands, Rob S B

    2016-02-01

    Myocardial perfusion imaging is performed most commonly using Tc-99m-sestamibi or tetrofosmin SPECT as well as Rb-82-rubidium or N-13-ammonia PET. Diseased-to-normal tissue contrast is determined by the tracer retention fraction, which decreases nonlinearly with flow. Reduced tissue perfusion results in reduced tracer retention, but the severity of perfusion defects is typically underestimated by 20% to 40%. Compared to SPECT, retention of the PET tracers is more linearly related to flow, and therefore, the perfusion defects are measured more accurately using N-13-ammonia or Rb-82.

  17. Laboratory Testing of Magnetic Tracers for Soil Erosion Measurement*1

    Institute of Scientific and Technical Information of China (English)

    HU Guo-Qing; DONG Yuan-Jie; WANG Hui; QIU Xian-Kui; WANG Yan-Hua

    2011-01-01

    Soil erosion, which includes soil detachment, transport, and deposition, is one of the important dynamic land surface processes. The magnetic tracer method is a useful method for studying soil erosion processes. In this study, five types of magnetic tracers were made with fine soil, fly ash, cement, bentonite, and magnetic powder (reduced iron powder) using the method of disk granulation. The tracers were uniformly mixed with soil and tested in the laboratory using simulated rainfall and inflow experiments to simulate the interrill and rill components of soil erosion, in order to select one or more tracers which could be used to study detachment and deposition by the erosive forces of raindrops and surface flow of water on a slope. The results showed that the five types of magnetic tracers with high magnetic susceptibility and a wide range of sizes had a range of 0.99-1.29 gcm-s in bulk density. In the interrill and rill experiments, the tracers FC1 and FC2 which consisted of fly ash and cement at ratios of 1:1 and 2:1, respectively, were transported in phase with soil particles since the magnetic susceptibility of sediment approximated that of the soil which was uneroded and the slopes of the regression equations between the detachment of sediment and magnetic tracers FC1 and FC2 were very close to the expected value of 20, which was the original soil/tracer ratio. The detachment and deposition on slopes could be accurately reflected by the magnetic susceptibility differences. The change in magnetic susceptibility depended on whether deposition or detachment occurred. However, the tracer FS which consisted of fine soil and the tracers FB1 and FB2 which consisted of fly ash and bentonite at ratios of 1:1 and 2:1, respectively, were all unsuitable for soil erosion study since there was no consistent relationship between sediment and tracer detachment for increasing amounts of runoff. Therefore, the tracers FC1 and FC2 could be used to study soil erosion by water.

  18. Evaluation and development of soil values for the pathway 'soil to plant'. Significance of mercury evaporation for the burden of plants; Ueberpruefung und Fortentwicklung der Bodenwerte fuer den Boden-Pflanze-Pfad. Teilbericht 2: Evaporation von Quecksilber aus kontaminierten Boeden und deren Bedeutung fuer die Hg-Aufnahme von Kulturpflanzen

    Energy Technology Data Exchange (ETDEWEB)

    Schlueter, K.; Gaeth, S.

    2001-10-01

    In cooperation with the Ad-hoc working group 'Transfer of heavy metals from soil to plant' of the Laenderarbeitsgemeinschaft Bodenschutz (LABO) the significance of mercury evaporation for the deduction of threshold values in respect of the impact via the pathway soil to plant was investigated. Mercury contamination of food- and feeding stuff plants was examined with special emphasis. For these purposes a lab experiment including three different soils with varying initial mercury load (background level, geogenic and anthropogenic contamination) and two different plant species (parsley and spinach) was carried out under defined conditions in closed lysimeters. Mercury uptake via the roots was minimised since the plants grew in isolated customary substrate which showed a low concentration of mercury. Thus, only the surrounding soil evaporated mercury. The concentrations of mercury in the plants in the background level treatment (0.1 mg Hg/kg dry soil) were 0.15 mg/kg dry matter (spinach). The treatment with anthropogenic contaminated soil (111 mg Hg/kg dry soil) resulted in concentrations in the two plants of 2.0 and 2.6 mg/kg dry matter, respectively. A comparable order of magnitude was achieved in the geogenic contaminated treatment (34 mg Hg/kg dry soil) with 2.1 mg/kg dry matter (spinach) and 0.44 mg/kg dry matter (parsley). Experiments conducted with radioactive {sup 203}Hg showed in each case Hg-tracer in the leaves, in the stem and in the roots, indicating a translocation within the plant from leaf to root. By means of a comprehensive literature study the state of the art for Hg-evaporation and Hg-uptake of plants was compiled. Comparing the experimental results with data derived from literature, the Hg-concentrations found are confirmed by results of other authors. (orig.) [German] In fachlicher Zusammenarbeit mit der Ad-hoc-Arbeitsgruppe 'Schwermetalltransfer Boden/Pflanze' der Laenderarbeitsgemeinschaft Bodenschutz (LABO) wurde fuer die

  19. Small Molecule PET Tracers in Drug Discovery.

    Science.gov (United States)

    Donnelly, David J

    2017-09-01

    The process of discovering and developing a new pharmaceutical is a long, difficult, and risky process that requires numerous resources. Molecular imaging techniques such as PET have recently become a useful tool for making decisions along a drug candidate's development timeline. PET is a translational, noninvasive imaging technique that provides quantitative information about a potential drug candidate and its target at the molecular level. Using this technique provides decisional information to ensure that the right drug candidate is being chosen, for the right target, at the right dose within the right patient population. This review will focus on small molecule PET tracers and how they are used within the drug discovery process. PET provides key information about a drug candidate's pharmacokinetic and pharmacodynamic properties in both preclinical and clinical studies. PET is being used in all phases of the drug discovery and development process, and the goal of these studies are to accelerate the process in which drugs are developed. Copyright © 2017. Published by Elsevier Inc.

  20. National Biomedical Tracer Facility: Project definition study

    Energy Technology Data Exchange (ETDEWEB)

    Heaton, R.; Peterson, E. [Los Alamos National Lab., NM (United States); Smith, P. [Smith (P.A.) Concepts and Designs (United States)

    1995-05-31

    The Los Alamos National Laboratory is an ideal institution and New Mexico is an ideal location for siting the National Biomedical Tracer Facility (NBTF). The essence of the Los Alamos proposal is the development of two complementary irradiation facilities that combined with our existing radiochemical processing hot cell facilities and waste handling and disposal facilities provide a low cost alternative to other proposals that seek to satisfy the objectives of the NBTF. We propose the construction of a 30 MeV cyclotron facility at the site of the radiochemical facilities, and the construction of a 100 MeV target station at LAMPF to satisfy the requirements and objectives of the NBTF. We do not require any modifications to our existing radiochemical processing hot cell facilities or our waste treatment and disposal facilities to accomplish the objectives of the NBTF. The total capital cost for the facility defined by the project definition study is $15.2 M. This cost estimate includes $9.9 M for the cyclotron and associated facility, $2.0 M for the 100 MeV target station at LAMPF, and $3.3 M for design.

  1. TRACER STUDY OF RTU GRADUATES: AN ANALYSIS

    Directory of Open Access Journals (Sweden)

    Thelma L. Ramirez

    2014-01-01

    Full Text Available This paper aimed to determine if the field of specialization in the different colleges of RTU graduates and their academic-acquired skills and competencies are related to their present occupations. A modified Graduate Tracer Study (GTS instrument was utilized to gather the quantitative data. Out of 500 questionnaires administered, there were 250 graduates returned answered questionnaires representing the three Colleges: Education, Arts and Sciences, Business and Entrepreneurial Technology. A face to face interview was also conducted in order to support the gathered data. The SPSS was used to generate results from the acquired quantitative data using the frequency counts, percentage and the Chi-square goodness of fit test. The findings revealed that the graduates claimed that their knowledge, academic-acquired skills and competencies contributed greatly in their job performance. The Chi-square goodness of fit proved that there is a significant relationship between the graduates’ fields of specialization and their occupations after graduation. Likewise, the academic-acquired skills and competencies of the graduates are relevant to their chosen occupations. The results further proved that RTU produces marketable and appropriately trained graduates with the majority landing in course-related jobs within a short period after graduation. The study also indicates that the RTU graduates possess the skills and competencies necessary to succeed in this competitive world. However eexpansion of tie-ups with private business entities is made to at least maintain the high employability level of the graduates.

  2. Development of a new metal casting technique for micromechanical systems; Entwicklung einer neuen Metallgiesstechnik fuer die Mikromechanik

    Energy Technology Data Exchange (ETDEWEB)

    Bach, F.W.; Moehwald, K.; Hollaender, U.; Nakhosteen, B. [Dortmund Univ. (Germany). Lehrstuhl fuer Werkstofftechnologie

    2001-03-01

    The effect that metallic molten masses can flow into deep and narrow gaps by capillary action forms the basis of the mould filling mechanism of the micro casting process presented here. Potential applications of ''Capillary Action Microcasting'' are the minimal invasive surgery (e. g. micromechanical endoscope items, grippers and cutting tools), magnetic actuators and the micro-electromechanical system (MEMS) technique (e. g. magnetic cores for micromechanical drive components and sensors) as well as the technology of mechanism design. Castings of a eutectic silver-copper alloy prove that both a definition and a guaranteed withdrawal of the cast part are achieved. The procedure is suitable and promising for the production of magnetic components, e. g. Fe47Sb53 for micro-electric motors. (orig.) [German] Der Effekt, dass metallische Schmelzen durch Kapillardruck in enge, tiefe Spalte einfliessen koennen, bildet die Basis fuer den Formfuellungsmechanismus des hier vorgestellten Mikro-Giessverfahrens, des ''Metall-Kapillardruckgiessens''. Potentielle Anwendungen werden in der minimalinvasiven Chirurgie (z. B. mikromechanische Endoskopelemente, Greiferzangen und Schneidwerkzeuge), der Magnetoaktorik und der mikro-elektromechanischen System (MEMS)-Technik, z. B. magnetische Kerne fuer mikromechanische Antriebselemente und Sensoren, sowie der Getriebetechnik erwartet. Abguesse, die mit Ag72Cu28-Schmelzen kapillardruckgegossen wurden, belegen, dass sowohl eine hohe Konturentreue als auch eine sichergestellte Entnahme des Gussteils realisiert wird. Das Verfahren ist geeignet und aussichtsreich fuer die Herstellung magnetischer Bauteile aus Fe47Sb53, wie z. B. fuer Mikro-Elektromotoren. (orig.)

  3. Symposium on hydrogen technology and fuel cells - opportunities for the economy; Symposium Wassertechnologie und Brennstoffzellen - Chancen fuer die Wirtschaft

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2002-07-01

    This volume contains 17 contributions on fuel cell technology and on the infrastructure required for hydrogen production and supply, in the form of abstracts and short reports. [German] Dieser Band enthaelt 17 Beitraege zum Themenkreis Brennstoffzellentechnologie und die dazu erforderliche Infrastruktur fuer die Wasserstofferzeugung und -versorgung in Form von Kurzfassungen und Vortragsfolien.

  4. Big like a gym. New business models for public utilities; Gross wie eine Turnhalle. Neue Geschaeftsmodelle fuer Stadtwerke

    Energy Technology Data Exchange (ETDEWEB)

    Schwarzburger, Heiko

    2013-10-01

    Electricity storage is no longer a vision, also in the case of greater power ratings too. The breakthrough is done: ready-to-connect systems are available as complete packages or containers. [German] Stromspeicher sind keine Vision mehr. Auch nicht fuer grosse Leistungen. Der Durchbruch ist geschafft: Anschlussfertige Systeme sind als Container oder Gesamtpakete verfuegbar.

  5. Investigation of low-maintenance particulate filters for underground diesel engines; Untersuchung von wartungsarmen Partikelfiltern fuer Untertage-Dieselmotoren

    Energy Technology Data Exchange (ETDEWEB)

    Vogel, J. [Deutsche Montan Technologie GmbH, Bochum (Germany). Car Synergies Div.

    2001-07-01

    The investigation focused on the applicability and efficiency of particulate filters in underground applications. After a definition of tasks and a market survey, an externally regenerating ceramic monolithe filter in tandem design was chosen for the further studies. The filter was tested in a test stand. Particulate emissions were found to be reduced to one-sixteenth the initial level. [German] Die Entwicklung von Partikelrueckhaltesystemen fuer untertaegig eingesetzte Dieselmotoren wird durch die Inkrafttretung der Gefahrstoffverordnung fuer den deutschen Steinkohlebergbau ab dem 1. Januar 2000 dringender als bisher. Das Ziel des Vorhabens war es, den grundsaetzlichen Einsatz sowie die Wirkung eines Partikelfilters im Steinkohlenbergbau nachzuweisen und nicht die technische Umsetzbarkeit von Partikelfiltern bei den untertage eingesetzten nassen Abgaskuehlsystemen. Nach der Erstellung eines Lastenheftes fuer die Anbieter von Partikelfiltern und einer anschliessenden Marktrecherche wurden die Filtrier- und Regenerationsverfahren auf ihren Anwendungsfall hin abgewogen und letztlich ein extern zu regenerierender Keramikmonolith in Tandemausfuehrung fuer die weiteren Untersuchungen gewaehlt. Dieser Filter wies zuerst in Pruefstandsuntersuchungen nach einem statischen Motorentest (ISO 8178 C1) seine Wirksamkeit an einem modernen Dieselmotor mit Direkteinspritzung, Turboaufladung und Ladeluftkuehlung nach. Die Partikelemission liess sich auf ein Sechzehntel senken. (orig.)

  6. A Systematic Method For Tracer Test Analysis: An Example Using Beowawe Tracer Data

    Energy Technology Data Exchange (ETDEWEB)

    G. Michael Shook

    2005-01-01

    Quantitative analysis of tracer data using moment analysis requires a strict adherence to a set of rules which include data normalization, correction for thermal decay, deconvolution, extrapolation, and integration. If done correctly, the method yields specific information on swept pore volume, flow geometry and fluid velocity, and an understanding of the nature of reservoir boundaries. All calculations required for the interpretation can be done in a spreadsheet. The steps required for moment analysis are reviewed in this paper. Data taken from the literature is used in an example calculation.

  7. Forest report 2012 for Baden-Wuerttemberg; Waldzustandsbericht 2012 fuer Baden-Wuerttemberg

    Energy Technology Data Exchange (ETDEWEB)

    Meining, Stefan [Buero fuer Umweltueberwachung, Freiburg (Germany); Wilpert, Klaus v.; Schaeffer, Juergen; Hartmann, Peter; Schumacher, Joerg; Delb, Horst [Forstliche Versuchs- und Forschungsanstalt Baden-Wuerttemberg, Freiburg im Breisgau (Germany); Augustin, Nicole [Bath Univ. (United Kingdom)

    2012-07-01

    The Forest State Report 2012 systematically records the health status of the forest resources in the country on a scientific basis. Environmental information is measured, recorded and evaluated in the context of forest environmental monitoring using a measuring network. More than a third of the forest area has suffered significant damage. The share of undamaged forest areas has declined by almost one third to 26 percent since last year. Compared to the previous year, the crown damage increased by an average of 2.5 percentage points. More important, however, is the fact that for the two main tree species spruce and beech since the turn of the millennium, there has been a marked increase in the damage intensity for all age groups. [German] Der Waldzustandsbericht 2012 erfasst auf wissenschaftlicher Basis systematisch den Gesundheitszustand der Waldbestaende im Land. Im Rahmen des Forstlichen Umweltmonitorings werden mit Hilfe eines Messnetzes Umweltinformationen gemessen, erfasst und ausgewertet. Ueber ein Drittel der Waldflaeche weist deutliche Schaeden auf. Der Anteil der ungeschaedigten Waldflaechen ist seit dem letzten Jahr um fast ein Drittel auf 26 Prozent zurueckgegangen. Die Kronenschaeden haben gegenueber dem Vorjahr um durchschnittlich 2,5 Prozentpunkte zugenommen. Wichtiger ist jedoch der Befund, dass fuer die beiden Hauptbaumarten Fichte und Buche seit der Jahrtausendwende ein deutlicher Anstieg der Schadensintensitaet fuer alle Altersklassen zu beobachten ist.

  8. Process cost calculation - an alternative to cost management?; Prozesskostenrechnung - eine Alternative fuer das Kostenmanagement?

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    1998-01-12

    Increasing competition and changing markets in the energy sector make new demands on cost management and at the same time on the quality to be provided by the costing systems. The process cost calculation used today in various branches of industry is able to contribute - by orientating itself to processes and chains of delivered value - to an assignment of costs doing more justice to the causes so that costing information with improved meaningfulness is available for entrepreneurial decisions. The authors introduce process cost calculation and illustrate its function using a practice-related example for its application. Potential fields of utilisation in the electricity supply enterprises are subsequently shown. (orig.) [Deutsch] Zunehmender Wettbewerb und sich wandelnde Maerkte im Energiesektor stellen neue Anforderungen an das Kostenmanagement und damit auch an die Qualitaet der von den Kostenrechnungssystemen bereitzustellenden Informationen. Die heute in verschiedenen Wirtschaftszweigen eingesetzte Prozesskostenrechnung kann - durch Orientierung an Prozessen und Wertschoepfungsketten - zu einer verursachungsgerechteren Kostenzuordnung beitragen, so dass fuer unternehmerische Entscheidungen Kostenrechnungsinformationen mit verbesserter Aussagekraft zur Verfuegung stehen. Die Verfasser stellen die Prozesskostenrechnung vor und veranschaulichen deren Funktionsweise anhand eines praxisbezogenen Anwendungsbeispiels. Im Anschluss werden moegliche Einsatzgebiete fuer Energieversorgungsunternehmen aufgezeigt. (orig.)

  9. Device for applying organic chemicals to lysimeter surfaces; Applikationsvorrichtung fuer organische Chemikalien auf Lysimeteroberflaechen

    Energy Technology Data Exchange (ETDEWEB)

    Schroll, R. [GSF - Forschungszentrum fuer Umwelt und Gesundheit Neuherberg GmbH, Oberschleissheim (Germany). Inst. fuer Bodenoekologie

    1999-02-01

    One of the aims of environmental research at the GSF Research Centre for the Environment and Health is to determine the behaviour of environmentally consequential chemicals in terrestrial ecosystems under as natural conditions as possible. The GSF lysimeter plant in Neuherberg permits studying the environmental behaviour of organic chemicals in different soils. Collaborators at GSF have developed a means of applying -14-marked substances in field lysimeters so as to be able to refind released chemicals, identify their conversion products and set up mass balances for the chemicals. [Deutsch] Ein Ziel der Umweltforschung im GSF-Forschungszentrum fuer Umwelt und Gesundheit ist es, das Verhalten von Umweltchemikalien in terrestrischen Oekosystemen unter moeglichst natuerlichen Bedingungen zu bestimmen. In der GSF-Lysimeteranlage Neuherberg kann das Umweltverhalten von Organika in verschiedenen Boeden untersucht werden. Zur Wiedererkennung der ausgebrachten Chemikalie bzw. zur Identifizierung aus ihr entstandener Umwandlungsprodukte und letztendlich auch zur Erstellung einer Massenbilanz fuer das ausgebrachte Praeparat wurde in der GSF die Moeglichkeit geschaffen, {sup 14}C-markierte Substanzen in Freilandlysimetern applizieren zu koennen. (orig.)

  10. Optimization of operating parameters of internally cooled superconducting cables; Optimale Betriebsparameter fuer intern gekuehlte Supraleiterkabel

    Energy Technology Data Exchange (ETDEWEB)

    Katheder, H. [Max-Planck-Inst. fuer Plasmaphysik, Garching (Germany). NET Team

    1995-12-31

    Large superconducting coils such as are used for fusion experiments (Tokamak or Stellarator confiurations) are best equipped with internally cooled superconducting cables. These cables, which are cooled with helium at 4 Kfuer Fusionsexperimente (Tokamak- oder Stellarator Anordnungen) werden mit Vorteil intern gekuehlte Supraleiterkabel eingesetzt. Seit einigen Jahren werden solche Kabel, gekuehlt mit Helium bei 4Fuer den Entwurf eines kryogenen Kuehlsystems muss man die optimalen Betriebsparameter d.h. Eintrittsdruck, Druckabfall, Masenstrom und Eintrittstemperatur kennen. Optimal sind diese Betriebsparameter dann, wenn das Kabel mit minimalem Massenstrom gekuehlt werden kann. Der Bericht befasst sich mit dem thermodynamischen Verhalten von stroemenden Helium in Kanaelen und der moeglichen Waermelast in einem Kabel. Es wird eine Mehtode gezeigt die optimalen Betriebsparameter zu finden und mit tyischen Kabeldaten eine numerische Berechnung durchgefuehrt. (orig.)

  11. 2002 summit course at the international nuclear law school; Internationale Schule fuer Nuklearrecht 2002. Ein Erfahrungsbericht

    Energy Technology Data Exchange (ETDEWEB)

    Dietze, W. [Inst. fuer Voelkerrecht/Abt. Atomenergierecht, Univ. Goettingen, Goettingen (Germany)

    2003-02-01

    Report by a participant in the International Nuclear Law School. In 2001, this advanced training course was first offered by the OECD-NEA together with the University of Montpellier and other international partners. This effort is intended to provide an overview of nuclear law, a discipline normally playing a subordinate role in curricula. In this way, a contribution is to be made to the important preservation of the existing knowledge base and to increasing know-how in this field. In 2003, the International Nuclear Law School will be continued with a new curriculum addressed to all interested participants. (orig.) [German] Erfahrungsbericht eines Teilnehmers der Internationalen Schule fuer Nuklearrecht 2002 an der Universitaet Montpellier. Erstmals im Jahr 2001 wurde diese Fortbildungsveranstaltung von der Nuclear Energy Agency der Organisation for Economic Co-operation and Development (OECD-NEA) zusammen mit der Universitaet Montpellier und weiteren internationalen Kooperationspartnern angeboten. Ziel ist es, das weltweite in Lehrveranstaltungen eher untergeordnete Nuklearrecht in einem Gesamtueberblick zu vermitteln und damit zum wichtigen Wissenserhalt und zur Foerderung des Know-hows auf diesem Sektor beizutragen. Die Internationale Schule fuer Nuklearrecht wird im Jahr 2003 mit einem erneuten Teilnahmeangebot fortgefuehrt. (orig.)

  12. Documentation system for technical components of a gas supply network; Dokumentationssystem fuer technische Anlagen eines Gasversorgers

    Energy Technology Data Exchange (ETDEWEB)

    Edler, D. [Untergrundspeicher- und Geotechnologie-Systeme GmbH, Mittenwalde (Germany); Froebel, J. [DBI GUT GmbH, Leipzig (Germany); Hofmann, V. [GDM mbH Leipzig (Germany); Ressler, M. [Verbundnetz Gas AG, Leipzig (Germany)

    2000-07-01

    The VNG-Verbundnetz Gas AG (VNG) operates the biggest supraregional gas supply network in East Germany. Its customers are regional and communal utilities, industrial users and power plants. The documentation for all these plants comprises about 300,000 document of different sizes, types and degrees of validity. In the mid-nineties, first attempts were made to improve the handling of the technical documents by introducing a computer-assisted plant documentation system (ADS). [German] Die VNG-Verbundnetz Gas AG (VNG) betreibt das groesste ueberregionale Ferngasnetz in den neuen Bundeslaendern und versorgt regionale und kommunale Energieversorgungsunternehmen sowie industrielle Abnehmer und Kraftwerke. Fuer diese Anlagen existieren ca. 300.000 Dokumente, die entsprechend ihrem Erzeugungsdatum in verschiedener Groesse, Ausfertigung und Gueltigkeit vorliegen. Ausgehend von der Bedeutung der Dokumentation fuer die Betriebsfuehrung der Anlagen wurden Mitte der 90er Jahre erste Schritte zur durchgaengigen Verbesserung des Umgangs mit der technischen Anlagendokumentation eingeleitet und mit der Einfuehrung eines EDV-gestuetzten Anlagendokumentationssystems (ADS) begonnen. (orig.)

  13. Selection of procedures for inservice inspections; Auswahl der Verfahren fuer wiederkehrende Pruefungen

    Energy Technology Data Exchange (ETDEWEB)

    Brast, G. [Preussische Elektrizitaets-AG (Preussenelektra), Hannover (Germany); Britz, A. [Bayernwerk AG, Muenchen (Germany); Maier, H.J. [Stuttgart Univ. (Germany). Staatliche Materialpruefungsanstalt; Seidenkranz, T. [TUEV Energie- und Systemtechnik GmbH, Mannheim (Germany)

    1998-11-01

    At present, selection of procedures for inservice inspection has to take into account the legal basis, i.e. the existing regulatory codes, and the practical aspects, i.e. experience and information obtained by the general, initial inservice inspection or performance data obtained by the latest, recurrent inspection. However, regulatory codes are being reviewed to a certain extent in order to permit integration of technological progress. Depending on the degree of availability in future, of inspection task-specific, sensitive and qualified NDE techniques for inservice inspections (`risk based ISI`), the framework of defined inspection intervals, sites, and detection limits will be broken up and altered in response to progress made. This opens up new opportunities for an optimization of inservice inspections for proof of component integrity. (orig./CB) [Deutsch] Zur Zeit muss sich die Auswahl der Pruefverfahren an den gueltigen Regelwerken und, da es sich um wiederkehrende Pruefungen handelt, an der Basispruefung bzw. der letzten wiederkehrenden Pruefung orientieren. Jedoch vollzieht sich zur Zeit eine Oeffnung der Regelwerke, mit der man auch der Weiterentwicklung der Prueftechniken Rechnung traegt. In dem Masse, wie zukuenftig auf die Pruefaufgabe/Pruefaussage optimal abgestimmte und qualifizierte Prueftechniken mit einer hohen Nachweisempfindlichkeit am Bauteil fuer zielgerichtete wiederkehrende Pruefungen (als `risk based ISI`) zur Verfuegung stehen, wird der Rahmen mit festgelegten Pruefintervallen, Prueforten und festen Registriergrenzen gesprengt und variabel gestaltet werden koennen. Damit ergeben sich neue Moeglichkeiten fuer eine Optimierung der WKP zum Nachweis der Integritaet des Bauteils. (orig./MM)

  14. Forest report 2015 for Baden-Wuerttemberg; Waldzustandsbericht 2015 fuer Baden-Wuerttemberg

    Energy Technology Data Exchange (ETDEWEB)

    Meining, Stefan [Buero fuer Umweltueberwachung, Freiburg (Germany); Wilpert, Klaus v.; Hoelscher, Andrea [Forstliche Versuchs- und Forschungsanstalt Baden-Wuerttemberg, Freiburg im Breisgau (Germany); and others

    2015-07-01

    In Baden-Wuerttemberg, the state of forests has been recorded since the 1980s in the course of an annual forest status report. In 2015, a decline in forest damage can be reported. As an indicator for the evaluation of the forest state, the crown condition of the trees applies. The average crown defoliation has been reduced by two percentage points to around 24 percent, while the share of healthy forest areas increased by five percentage points to a total of 29 percent. The clearly damaged forest areas decreased by six percentage points to 36 percent. Concerns are causing a relatively new fungus disease in the tree species ash, the ash dieback. [German] In Baden-Wuerttemberg wird der Zustand der Waelder seit den 1980er Jahren im Zuge eines jaehrlichen Waldzustandsberichtes erfasst. Fuer das Jahr 2015 kann erfreulicherweise einen Rueckgang der Waldschaeden verzeichnet werden. Als Indikator fuer die Beurteilung des Waldzustandes gilt der Kronenzustand der Baeume. Die durchschnittliche Kronenverlichtung hat sich um zwei Prozentpunkte auf rund 24 Prozent verringert, waehrend sich der Anteil der gesunden Waldflaeche um fuenf Prozentpunkte auf insgesamt 29 Prozent erhoehte. Die deutlich geschaedigten Waldflaechen verringerten sich um sechs Prozentpunkte auf 36 Prozent. Sorgen bereitet eine relativ neue Pilzerkrankung bei der Baumart Esche, das Eschentriebsterben.

  15. West Twin Creek Alaska Subsurface Bromide Tracer Experiment, 2015

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This data was produced as part of a subsurface tracer experiment performed on a boreal hillslope in July, 2015. The data is separated into three files: 'Well...

  16. Microfluidics for Synthesis of Peptide-Based PET Tracers

    Directory of Open Access Journals (Sweden)

    Yang Liu

    2013-01-01

    Full Text Available Positron emission tomography (PET is a powerful noninvasive tool for acquisition of the physiological parameters in human and animals with the help of PET tracers. Among all the PET tracers, radiolabeled peptides have been widely explored for cancer-related receptor imaging due to their high affinity and specificity to receptors. But radiochemistry procedures for production of peptide-based PET tracers are usually complex, which makes large-scale clinical studies relatively challenging. New radiolabeling technologies which could simplify synthesis and purification procedures, are extremely needed. Over the last decade, microfluidics and lab-on-a-chip (LOC technology have boomed as powerful tools in the field of organic chemistry, which potentially provide significant help to the PET chemistry. In this minireview, microfluidic radiolabeling technology is described and its application for synthesis of peptide-based PET tracers is summarized and discussed.

  17. Chlorine isotopes potential as geo-chemical tracers

    Digital Repository Service at National Institute of Oceanography (India)

    Shirodkar, P.V.; Pradhan, U.K.; Banerjee, R.

    The potential of chlorine isotopes as tracers of geo-chemical processes of earth and the oceans is highlighted based on systematic studies carried out in understanding the chlorine isotope fractionation mechanism, its constancy in seawater and its...

  18. Tracking thermal fronts with temperature-sensitive, chemically reactive tracers

    Energy Technology Data Exchange (ETDEWEB)

    Robinson, B.A.; Birdsell, S.A.

    1987-01-01

    Los Alamos is developing tracer techniques using reactive chemicals to track thermal fronts in fractured geothermal reservoirs. If a nonadsorbing tracer flowing from the injection to production well chemically reacts, its reaction rate will be a strong function of temperature. Thus the extent of chemical reaction will be greatest early in the lifetime of the system, and less as the thermal front progresses from the injection to production well. Early laboratory experiments identified tracers with chemical kinetics suitable for reservoirs in the temperature range of 75 to 100/sup 0/C. Recent kinetics studies have focused on the kinetics of hydrolysis of derivatives of bromobenzene. This class of reactions can be used in reservoirs ranging in temperature from 150 to 275/sup 0/C, which is of greater interest to the geothermal industry. Future studies will include laboratory adsorption experiments to identify possibly unwanted adsorption on granite, development of sensitive analytical techniques, and a field demonstration of the reactive tracer concept.

  19. A theoretical framework of tracer methods for marine sediment dynamics

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    A new theoretical framework of tracer methods is proposed in the present contribution, on the basis of mass conservation. This model is applicable for both artificial and natural tracers. It can be used to calculate the spatial distribution patterns of sediment transport rate, thus providing independent information and verification for the results derived from empirical formulae. For the procedures of the calculation, first, the tracer concentration and topographic maps of two times are obtained. Then, the spatial and temporal changes in the concentration and seabed elevation are calculated, and the boundary conditions required are determined by field observations (such as flow and bedform migration measurements). Finally, based upon eqs. (1) and (13), the transport rate is calculated and expressed as a function of the position over the study area. Further, appropriate modifications to the model may allow the tracer to have different densities and grain size distributions from the bulk sediment.

  20. Communicating to gain public acceptance of energy projects; Akzeptanzkommunikation fuer Energieprojekte

    Energy Technology Data Exchange (ETDEWEB)

    Pust, M. [TECSOL GmbH, Friedeburg (Germany)

    2014-07-01

    Whoever plans to execute energy projects in today's world should be aware of the fact that the social framework conditions surrounding such projects have changed significantly. For the organization executing the project to merely adhere to the legally prescribed authorization procedure and leave it until the end of the planning procedure to inform those affected is often no longer sufficient for gaining public acceptance. Large parts of the population criticise the usual procedures because they have lost confidence in this kind of decision making, which offers them too little scope for co-determination. Thus for some years there has been a growing number of cases where citizens demand full public participation and early information on why the project in question is needed and what kinds of impact it will have. Lack of acceptance can lead to resistance, with negative effects on the project and the companies involved. TECSOL takes care of the communication management alongside energy projects, taking its bearings by the existing standards for voluntary early information of the public, as recommended by the VDI (Guideline 7001) and required by the legislature (PlVereinhG = Law for Improvement of Public Participation and Harmonisation of Plan Approval Procedures). The lecture outlines the societal challenges involved as well as the possibilities for dealing fairly with demands of the population in the context of energy projects. This is illustrated using the model case of the ''Etzel cultural landscape'' as a practical example, in which TECSOL played a prominent role on behalf of IVG Caverns GmbH. [German] Wer heute Energieprojekte umsetzen will, muss sich im Klaren darueber sein, dass sich die gesellschaftlichen Rahmenbedingungen stark veraendert haben. Es reicht fuer die Akzeptanz des Vorhabens haeufig nicht mehr aus, dass ein Vorhabentraeger den rechtlich vorgegebenen Weg des Genehmigungsprozesses beschreitet und die betroffenen Buerger erst

  1. Assessment of Halon-1301 as a groundwater age tracer

    OpenAIRE

    M. Beyer; R. van der Raaij; U. Morgenstern; Jackson, B.(Department of Physics, University of Pennsylvania, Philadelphia, PA, United States)

    2015-01-01

    Groundwater dating is an important tool to assess groundwater resources in regards to their dynamics, i.e. direction and timescale of groundwater flow and recharge, contamination risks and manage remediation. To infer groundwater age information, a combination of different environmental tracers, such as tritium and SF6, are commonly used. However, ambiguous age interpretations are often faced, due to a limited set of available tracers and their individual restricted applicat...

  2. Assessment of Halon-1301 as a groundwater age tracer

    OpenAIRE

    M. Beyer; R. van der Raaij; U. Morgenstern; Jackson, B.(Department of Physics, University of Pennsylvania, Philadelphia, PA, United States)

    2015-01-01

    Groundwater dating is an important tool to assess groundwater resources in regards to their dynamics, i.e. direction and time scale of groundwater flow and recharge, to assess contamination risks and manage remediation. To infer groundwater age information, a combination of different environmental tracers, such as tritium and SF6, are commonly used. However, ambiguous age interpretations are often faced, due to a limited set of available tracers and their in...

  3. Mobility of Metal Tracers in Unsaturated Tuffs of Busted Butte

    Science.gov (United States)

    Groffman, A. R.

    2001-12-01

    A complex tracer mixture was injected continuously for over two years into a 10 m x 10 m x 7 m block of unsaturated tuff as part of the Busted Butte unsaturated-zone tracer test at Yucca Mountain. The test was designed to measure tracer transport within the Topopah Springs and Calico Hills tuffs, units that occur between the potential high-level nuclear waste repository at Yucca Mountain and the water table below. The mixture included nonreactive (Br, I, and fluorinated benzoic acids (FBAs)) and reactive tracers (Li, Ce, Sm, Ni, Co, and Mn). Bromide, I, FBAs, and Li were detected during the test on absorbent pads emplaced in a series of solute collection boreholes located beneath the injectors but the more strongly sorbing metals did not reach the collection boreholes during this period. To determine the distribution and mobility of these metals, tracer constituents were extracted from tuff samples collected during overcoring and mineback of the test block. Tracers were extracted from the tuff samples by leaching with a 5% nitric acid solution for metals and a bicarbonate-carbonate buffer for anions. Results from the overcore sample suite show that metals have migrated through the tuff in the region adjacent to and immediately below the tracer injectors. Consistent with laboratory sorption measurements and observed breakthrough in the collection boreholes, rock analyses showed that Li is the most mobile of the metals. Co and Ni behave similarly, traveling tens of cm from the injection sites, while Sm and Ce moved far less, possibly due to precipitation reactions in addition to sorption. Determination of Mn transport is complicated by high background concentrations in the tuff; additional background samples are currently being evaluated. As expected, our rock analyses show that the nonreactive tracers Br and FBAs have moved beyond the overcore region, corroborating results from collection boreholes.

  4. Tracer dispersion in a percolation network with spatial correlations

    Science.gov (United States)

    Makse; Andrade; Eugene Stanley H

    2000-01-01

    We analyze the transport properties of a neutral tracer in a carrier fluid flowing through percolationlike porous media with spatial correlations. We model convection in the mass transport process using the velocity field obtained by the numerical solution of the Navier-Stokes and continuity equations in the pore space. We find that the resulting statistical properties of the tracer show a transition from a subdiffusion regime at low Peclet number to an enhanced diffusion regime at high Peclet number.

  5. The Chernobyl reactor accident, ten years on. Teaching projects for mathematics instruction in interdisciplinary working groups; 10 Jahre nach Tschernobyl. Unterrichtsprojekte fuer den Mathematikunterricht in faecheruebergreifenden Kooperationen

    Energy Technology Data Exchange (ETDEWEB)

    Boer, H. [comp.; Delle, E. [comp.; Mies, K. [comp.; Warmeling, A. [comp.

    1996-10-01

    The booklet presents background information and addresses the following aspects: ionizing radiation and radiation effects; safety of German nuclear power plants; statistical evidence of radiation injuries; short-lived and long-lived ionizing radiation; radioactive waste; CO{sub 2} emissions as an argument in favour of nuclear power generation. The material presented is intended for use by a school project team interested in the subjects, or as a basis for collaborative, interdisciplinary teaching in working groups, and it offers information and problems for mathematics teaching. (HP) [Deutsch] Neben vielen Informationen behandelt die Broschuere: Strahlen und Strahlenwirkungen; Sicherheit deutscher Kernkraftwerke; statistischer Nachweis von Strahlenschaeden; Kurz- und Langfestigkeit der Strahlenbelastung; radioaktiver Abfall; CO{sub 2}-Problematik als Argument fuer die Kernenergie. Die Broschuere ist gedacht z.B. fuer eine Projektgruppe, einen Projekttag, fuer eine Lerngruppe in faecheruebergreifender Kooperation. Die Materialien sind ausgearbeitet fuer die Themembearbeitung im Mathematikunterricht mit Uebungsaufgaben. (HP)

  6. Particle Reduction Strategies - PAREST. Energy scenarios for PAREST. Sub-report; Strategien zur Verminderung der Feinstaubbelastung - PAREST. Energieszenarien fuer PAREST. Teilbericht

    Energy Technology Data Exchange (ETDEWEB)

    Joerss, Wolfram; Degel, Melanie [Institut fuer Zukunftsstudien und Technologiebewertung gGmbH (IZT), Berlin (Germany)

    2013-06-15

    In the research project PAREST emission scenarios to 2020 for particulate matter (PM{sub 10} und PM{sub 2,5}), and aerosol precursors SO{sub 2}, NO{sub x}, NH{sub 3} and NMVOC were prepared for Germany and Europe, mitigation measures evaluated and the results used to model the PM pollution load for Germany. In this part of the report to PAREST energy scenarios used for PAREST are presented. [German] Im Forschungsvorhaben PAREST wurden Emissionsszenarien bis 2020 fuer Feinstaub (PM{sub 10} und PM{sub 2,5}) und die Aerosol-Vorlaeufersubstanzen SO{sub 2}, NO{sub x}, NH{sub 3} und NMVOC fuer Deutschland und Europa erstellt, Minderungsmassnahmen evaluiert und daraus die PM-Immissionsbelastung fuer Deutschland modelliert. In diesem Teilbericht zu PAREST werden die fuer PAREST benutzten Energieszenarien vorgestellt.

  7. Development and testing of the pore burner technology for oil burners. Final report; Entwicklung und Erprobung der Porenbrennertechnik fuer Oelbrenner. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Durst, F.; Trimis, D.; Wawrzinek, K.; Koehne, H.; Lucka, K.; Rudolphi, I.; Hatzfeld, O.; Volkert, J.; Rutsche, A.; Adler, J.; Standke, G.; Haase, F.; Krueger, K.; Kuechen, C.

    2001-11-01

    The application of the pore burner technology in oil burners was investigated. Together with a new concept for oil-fuelled high efficiency boilers, this technology opens up a vast potential for energy conservation and pollutant reduction. [German] Der Waermebedarf von Wohneinheiten nimmt, flankiert durch Vorgaben des Gesetzgebers, in Zukunft weiter ab. Parallel dazu werden die Grenzwerte fuer die maximal zulaessigen Schadgasemissionen der Heizanlagen verschaerft und die emissionsintensiven und im intermittierenden Betrieb bei Teillast sehr haeufigen Start/Stop-Betriebsphasen konventioneller Oel-Heizsysteme strenger bewertet. Ziel dieses Vorhabens ist es, die fuer die Verbrennung gasfoermiger Brennstoffe bereits erfolgreich demonstrierten Vorteile der Porenbrennertechnik (sehr niedrige Schadstoffemissionen, aeusserst breiter Bereich der Leistungsmodulation bis 1:20, hohe Energiedichte und damit kleine Baugroesse, minimale Geraeuschemission) auch fuer die Verbrennung von Heizoel nutzbar zu machen. In Verbindung mit einem neuen Konzept fuer die Oel-Brennwerttechnik erschliesst diese Technologie ein hohes Einsparpotential hinsichtlich Energieverbrauch und Schadstoffemissionen. (orig.)

  8. Implementation of the BayBIS process information system in a power station at minimal cost; Die kostenminimale Realisierung des Prozessinformationssystems BayBIS fuer einen Kraftwerksbetreiber

    Energy Technology Data Exchange (ETDEWEB)

    Woyke, W.

    2000-07-01

    BKW are currently introducing the process information system BayBIS (Bayernwerk Betriebsinformationssystem) in three of their power stations. It was developed for a BKW medium-capacity power station where it was installed one year ago. The measuring and data acquisition systems of the power stations can be utilized for BayBIS. It is based on well-establilshed methods and makes use of the available IT systems. It is applied for process monitoring, process analysis, billing, controlling and reporting. [German] Die BKW fuehrt derzeit fuer drei Kraftwerke das Prozessinformationssystem BayBIS (Bayernwerk Betriebsinformationssystem) ein. Es wurde fuer ein Mittellastkraftwerk der BKW entwickelt und ist dort bereits seit einem Jahr im Einsatz. Messtechnik und prozessnahe Datenerfassung der Leittechnik in den Kraftwerken koennen fuer BayBIS genutzt werden. Es baut auf Methoden auf, die sich in der Praxis bewaehrt haben, und nutzt die vorhandene IT-Ausstattung des Unternehmens. Anwendung findet es fuer Prozessbeobachtung, Prozessanalyse, Abrechnung, Controlling und Berichtswesen. (orig.)

  9. More services for the network. Municipal public utilities and network operation - a practice report; Mehr Dienste fuer das Netz. Kommunale Stadtwerke und Netzbetrieb - ein Praxisreport

    Energy Technology Data Exchange (ETDEWEB)

    Trova, Marco [Power-One, Inc., Camarillo, CA (United States). Technical Sales

    2013-10-01

    New concepts for solar inverters stabilize the lines - even at night. The reactive power plays a significant role. [German] Neue Konzepte fuer Solarwechselrichter stabilisieren die Leitungen - auch in der Nacht. Dabei spielt die Blindleistung eine wesentliche Rolle.

  10. Small Molecule PET Tracers for Transporter Imaging.

    Science.gov (United States)

    Kilbourn, Michael R

    2017-09-01

    As the field of PET has expanded and an ever-increasing number and variety of compounds have been radiolabeled as potential in vivo tracers of biochemistry, transporters have become important primary targets or facilitators of radiotracer uptake and distribution. A transporter can be the primary target through the development of a specific high-affinity radioligand: examples are the multiple high-affinity radioligands for the neuronal membrane neurotransmitter or vesicular transporters, used to image nerve terminals in the brain. The goal of a radiotracer might be to study the function of a transporter through the use of a radiolabeled substrate, such as the application of 3-O-[(11)C]methyl]glucose to measure rates of glucose transport through the blood-brain barrier. In many cases, transporters are required for radiotracer distributions, but the targeted biochemistries might be unrelated: an example is the use of 2-deoxy-2-[(18)F]FDG for imaging glucose metabolism, where initial passage of the radiotracer through cell membranes requires the action of specific glucose transporters. Finally, there are transporters such as p-glycoprotein that function to extrude small molecules from tissues, and can effectively work against successful uptake of radiotracers. The diversity of structures and functions of transporters, their importance in human health and disease, and their role in therapeutic drug disposition suggest that in vivo imaging of transporter location and function will continue to be a point of emphasis in PET radiopharmaceutical development. In this review, the variety of transporters and their importance for in vivo PET radiotracer development and application are discussed. Transporters have thus joined the other major protein targets such as G-protein coupled receptors, ligand-gated ion channels, enzymes, and aggregated proteins as of high interest for understanding human health and disease. Copyright © 2017 Elsevier Inc. All rights reserved.

  11. Quantifying solute transport processes: are chemically "conservative" tracers electrically conservative?

    Science.gov (United States)

    Singha, Kamini; Li, Li; Day-Lewis, Frederick D.; Regberg, Aaron B.

    2012-01-01

    The concept of a nonreactive or conservative tracer, commonly invoked in investigations of solute transport, requires additional study in the context of electrical geophysical monitoring. Tracers that are commonly considered conservative may undergo reactive processes, such as ion exchange, thus changing the aqueous composition of the system. As a result, the measured electrical conductivity may reflect not only solute transport but also reactive processes. We have evaluated the impacts of ion exchange reactions, rate-limited mass transfer, and surface conduction on quantifying tracer mass, mean arrival time, and temporal variance in laboratory-scale column experiments. Numerical examples showed that (1) ion exchange can lead to resistivity-estimated tracer mass, velocity, and dispersivity that may be inaccurate; (2) mass transfer leads to an overestimate in the mobile tracer mass and an underestimate in velocity when using electrical methods; and (3) surface conductance does not notably affect estimated moments when high-concentration tracers are used, although this phenomenon may be important at low concentrations or in sediments with high and/or spatially variable cation-exchange capacity. In all cases, colocated groundwater concentration measurements are of high importance for interpreting geophysical data with respect to the controlling transport processes of interest.

  12. Determination of stream reaeration coefficients by use of tracers

    Science.gov (United States)

    Kilpatrick, F.A.; Rathbun, R.E.; Yotsukura, Nobuhiro; Parker, G.W.; DeLong, L.L.

    1989-01-01

    Stream reaeration is the physical absorption of oxygen from the atmosphere by a flowing stream. This is the primary process by which a stream replenishes the oxygen consumed in the biodegradation of organic wastes. Prior to 1965, reaeration rate coefficients could be estimated only by indirect methods. In 1965, a direct method of measuring stream reaeration coefficients was developed whereby a radioactive tracer gas was injected into a stream-the principle being that the tracer gas would be desorbed from the stream inversely to how oxygen would be absorbed. The technique has since been modified by substituting hydrocarbon gases for the radioactive tracer gas. This manual describes the slug-injection and constant-rate-injection methods of measuring gas-tracer desorption. Emphasis is on the use of rhodamine WT dye as a relatively conservative tracer and propane as the nonconservative gas tracer, on planning field tests, on methods of injection, sampling, and analysis, and on techniques for computing desorption and reaeration coefficients.

  13. Fourier analysis of multi-tracer cosmological surveys

    CERN Document Server

    Abramo, L Raul; Loureiro, Arthur

    2015-01-01

    We present optimal quadratic estimators for the Fourier analysis of cosmological surveys that detect several different types of tracers of large-scale structure. Our estimators can be used to simultaneously fit the matter power spectrum and the biases of the tracers - as well as redshift-space distortions (RSDs), non-Gaussianities (NGs), or any other effects that are manifested through differences between the clusterings of distinct species of tracers. Our estimators reduce to the one by Feldman, Kaiser & Peacock (ApJ 1994, FKP) in the case of a survey consisting of a single species of tracer. We show that the multi-tracer estimators are unbiased, and that their covariance is given by the inverse of the multi-tracer Fisher matrix (Abramo, MNRAS 2013; Abramo & Leonard, MNRAS 2013). When the biases, RSDs and NGs are fixed to their fiducial values, and one is only interested in measuring the underlying power spectrum, our estimators are projected into the estimator found by Percival, Verde & Peacock ...

  14. Energy spectra and passive tracer cascades in turbulent flows

    CERN Document Server

    Jolly, Michael

    2016-01-01

    We study the influence of the energy spectrum on the extent of the cascade range of a passive tracer in turbulent flows. The interesting cases are when there are two different spectra over the potential range of the tracer cascade (in 2D when the tracer forcing is in the inverse energy cascade range, and in 3D when the Schmidt number Sc is large). The extent of the tracer cascade range is then limited by the width of the range for the shallower of the two energy spectra. Nevertheless, we show that in dimension $d=2,3$ the tracer cascade range extends (up to a logarithm) to $\\kappa_{d\\text{D}}^{p}$, where $\\kappa_{d\\text{D}}$ is the wavenumber beyond which diffusion should dominate and $p$ is arbitrarily close to 1, provided Sc is larger than a certain power (depending on $p$) of the Grashof number. We also derive estimates which suggest that in 2D, for Sc${}\\sim1$ a wide tracer cascade can coexist with a significant inverse energy cascade at Grashof numbers large enough to produce a turbulent flow.

  15. HYDROGEL TRACER BEADS: THE DEVELOPMENT, MODIFICATION, AND TESTING OF AN INNOVATIVE TRACER FOR BETTER UNDERSTANDING LNAPL TRANSPORT IN KARST AQUIFERS

    Energy Technology Data Exchange (ETDEWEB)

    Amanda Laskoskie, Harry M. Edenborn, and Dorothy J. Vesper

    2012-01-01

    The goal of this specific research task is to develop proxy tracers that mimic contaminant movement to better understand and predict contaminant fate and transport in karst aquifers. Hydrogel tracer beads are transported as a separate phase than water and can used as a proxy tracer to mimic the transport of non-aqueous phase liquids (NAPL). They can be constructed with different densities, sizes & chemical attributes. This poster describes the creation and optimization of the beads and the field testing of buoyant beads, including sampling, tracer analysis, and quantitative analysis. The buoyant beads are transported ahead of the dissolved solutes, suggesting that light NAPL (LNAPL) transport in karst may occur faster than predicted from traditional tracing techniques. The hydrogel beads were successful in illustrating this enhanced transport.

  16. Solar electricity plants for the mass market, coupled to the network, must look like this; So muessen netzgekoppelte Solarstromanlagen fuer den Massenmarkt aussehen

    Energy Technology Data Exchange (ETDEWEB)

    Seltmann, T. [KRAUSS - Energie fuers Leben, Merkendorf (Germany)

    1996-12-01

    Detached houses are a potential group of customers for 1-5 kW PE plants. In this article, targets and requirements for the technology of such systems are introduced, starting from experience, the market position and the technical state. (HW) [Deutsch] Einfamilienhaeuser sind ein potentieller Kundenbereich fuer 1-5 kW-PV-Anlagen. Im vorliegenden Beitrag werden Ziele und Anforderungen fuer die Technik solcher Systeme vorgestellt, ausgehend von Erfahrungen, der Marktlage und dem technischen Stand. (HW)

  17. Sistem Pre Kompilasi Data Tracer Studi Online Ditjen Belmawa Ristekdikti (Studi Kasus: Politeknik Harapan Bersama

    Directory of Open Access Journals (Sweden)

    Very Kurnia Bakti

    2017-01-01

    Full Text Available Tracer studi merupakan salah satu upaya yang diharapkan dapat menyediakan informasi untuk mengevaluasi hasil pendidikan di Politeknik Harapan Bersama dari kuisioner yang diberikan kepada alumni. Kegiatan tracer studi ini sudah dilaksanakan secara online, namun masih terdapat kendala pada bagian sistem yang digunakan saat ini, hal tersebut menyebabkan Politeknik Harapan Bersama tidak dapat melaporkan / mengunggah hasil tracer studi kepada Ditjen Belmawa Ristekdikti, dimana form kuisioner dan data export tracer studi yang dihasilkan berbeda dengan kebutuhan seperti yang tercantum pada surat edaran No. 313/B/SE/2016 tentang pelaksanaan tracer studi di tingkat perguruan tinggi. Mengingat pentingnya tracer studi sebagai umpan balik bagi Politeknik Harapan Bersama, maka perlu solusi untuk mengatasi kekurangan sistem ini. Dengan merubah sistem yang ada dengan sistem tracer studi yang baru merupakan solusi yang tepat dalam permasalahan ini. Sistem tracer studi yang baru mampu menghasilkan data tracer studi alumni dan pengisian form kuisioner sesuai dengan standar Ditjen Belmawa Ristekdikti yang dapat diunggah sistem tracer studi ristekdikti.

  18. The Ladstattschacht cave shaft - tracer hydrological investigation of a site of organic pollution in the Alpine karst system; Der Ladstattschacht - tracerhydrologische Untersuchung einer organischen Altlast im alpinen Karst

    Energy Technology Data Exchange (ETDEWEB)

    Goldscheider, N. [Karlsruhe Univ. (T.H.) (Germany). Lehrstuhl fuer Angewandte Geologie

    1998-12-31

    The Ladstattschacht is a 47 m deep cave shaft in the Schwarzwasser valley (state of Vorarlberg, Austrian Alps) that was completely filled up with waste from private and communal sewage plants until 1975. A multi tracing experiment using three different fluorescent tracers was carried out in order to evaluate the risk potential of this waste site. The organic shaft fill itself, a pothole nearby the Ladstattschacht and an active swallow hole served as injection points. It could be demonstrated that all karstic springs in the Schwarzwasser valley are affected by seepage water from this waste site. Comparison of breakthrough curves allowed to determine retardation processes in the shaft fill and the unsaturated zone and to characterize the karst groundwater flow system. (orig.) [Deutsch] Der Ladstattschacht im Schwarzwassertal (Vorarlberg, Oesterreich) ist ein 47 m tiefer Hoehlenschacht, der bis 1975 als wilde Deponie fuer Klaerschlaemme verwendet wurde. Um das von dieser organischen Altlast ausgehende Gefaehrdungspotential zu bewerten, wurde ein kombinierter Markierungsversuch mit 3 verschiedenen Fluoreszenztracern durchgefuehrt. Dabei dienten die Schachtfuellung, ein benachbarter Naturschacht und eine aktive Schwinde als Eingabestellen. Es konnte belegt werden, dass saemtliche Karstquellen im Schwarzwassertal von Sickerwaessern aus dem Ladstattschacht erreicht werden. Durch den Vergleich der Durchgangskurven konnten sowohl die Retardationsvorgaenge in der Schachtfuellung und in der ungesaettigten Zone, als auch die Abstromverhaeltnisse der Karstentwaesserung charakterisiert werden. (orig.)

  19. Offshore wind power. Position paper of the Minister of the Environment; Windenergienutzung auf See. Positionspapier des Bundesministeriums fuer Umwelt, Naturschutz und Reaktorsicherheit zur Windenergienutzung im Offshore-Bereich

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2001-07-01

    The position paper will provide the basis for further strategies on offshore wind power development in consideration of ecological and conservation aspects. [German] Das Positionspapier des Bundesministeriums fuer Umwelt, Naturschutz und Reaktorsicherheit (BMU) einschliesslich des Umweltbundesamtes (UBA) und des Bundesamtes fuer Naturschutz (BfN) ist Ergebnis der Arbeiten der BMU-Projektgruppe 'Windenergienutzung im Offshore-Bereich im Hinblick auf die BMU-Anliegen'. Es beschreibt den derzeitigen Stand einer Strategie zur umwelt- und naturvertraeglichen Erschliessung der Windenergienutzung auf See (Offshore). Es bildet die Grundlage fuer die Weiterentwicklung dieser Strategie und dabei insbesondere zur Abstimmung mit den Anliegen anderer Bundesressorts und den Kuestenlaendern, sowie zur intensiveren Einbeziehung beteiligter Verbaende und Fachkreise. Vor dem Hintergrund der zur Genehmigung eingereichten Antraege fuer Offshore-Windparks, mangelnder Erfahrung der Behoerden mit dem Vollzug und einer z.T. noch ungeklaerten Rechtslage in der Ausschliesslichen Wirtschaftszone sowie einer Vielzahl von Nutzungsinteressen in Nord- und Ostsee ist kurzfristig eine Konsensbildung auf politischem Wege anzustreben, um die umwelt- und naturgerechte Erschliessung der Windenergienutzung auf See zuegig in Gang zu setzen. Fuer eine steuerbare Entwicklung der Offshore-Windenergienutzung in der AWZ ist es wichtig, anschliessend vergleichbare rechtliche Rahmenbedingungen wie fuer die Windenergie an Land zu schaffen. Das vorliegende Positionspapier beschreibt einen Weg, den Ausbau der Offshore-Windenergienutzung umwelt- und naturvertraeglich zu gestalten.

  20. Tools for closed modelling of flow processes in geothermal reservoir engineering; Tools fuer die geschlossene Modellierung der Fliessprozesse im geothermischen Reservoir Engineering

    Energy Technology Data Exchange (ETDEWEB)

    Alkan, H.; Lorenz, S.; Mueller, W. [Inst. fuer Sicherheitstechnologie (ISTec) GmbH, Koeln (Germany)

    2002-07-01

    Three programs are presented for numeric modelling of a geothermal reservoir. An analytical lumped-parameter model TUI-GRS 1 based on the mass and energy balance in the presence of a supporting aquifer for the liquid systems H{sub 2}O-CO{sub 2} is recommended for a global and initial assessment of the future performance of a geothermal reservoir. For a more detailed performance study, an adapted 3D simulator for temperature-dependent multphase-multicomponent flow in porous media, TOUGH2, is available. Thirdly, a numeric borehole simulator TUI-GWS was developed for calculating pressure profiles and calcite precipitation during geothermal production. [German] Fuer die numerische Modellierung eines geothermischen Reservoirs werden drei Programme vorgestellt, mit denen die relevanten Prozesse im Bohrloch und im Reservoir modelliert werden koennen. Fuer eine globale und initiale Ausgangsschaetzung der zukuenftigen Leistung, eines geothermischen Reservoirs kann ein analytisches 'lumped-parameter-Modell' TUI-GRS 1, das auf Massen- und Energiebilanz in Anwesenheit eines unterstuetzenden Aquifers fuer fluessige Systeme H{sub 2}O-CO{sub 2} basiert, benutzt werden. Fuer eine ausfuehrliche Leistungsstudie des Reservoirs ist ein fuer geothermische Systeme angepasster 3-D-Simulator fuer temperaturabhaengige Mehrphasen-Mehrkomponenten-Stroemungen in poroesen Medien, TOUGH2, geeignet. Ein numerischer Bohrloch-Simulator TUI-GWS wurde entwickelt, um die Druckprofile sowie Kalzitausfaellung waehrend der geothermischen Produktion zu berechnen. (orig.)

  1. Copper Ion as a New Leakage Tracer

    Directory of Open Access Journals (Sweden)

    Modaresi J.

    2013-12-01

    Full Text Available Statement of Problem: Most failures of root canal treatments are caused by bacteria. Studies showed that the most common cause of endodontic failures were the incomplete obturation of the root canal and the lack of adequate apical seal. Some in-vitro methods are used to estimate sealing quality, generally by measuring microleakage that allows the tracer agent to penetrate the filled canal.Purpose: Conventional methods of evaluating the seal of endodontically treated teeth are complicated and have some drawbacks. We used copper ion diffusion method to assess the leakage and the results were compared to dye penetration method.Materials and Method: The crowns of 21 extracted teeth were cut off at the CEJ level. After preparing the canals, the teeth were placed in tubes containing saline. They were divided randomly into 15 experimental cases; 3 positive and 3 negative controls. Positive controls were filled by single cone without sealer while the experimental and the negative control groups were filled by lateral technique. The coronal portion of gutta was removed and 9mm was left. The external surface of each tooth was coated with nail polish. Two millimeters of apical portion was immersed into 9ml of distilled water and 0.3ml of CuSO4 solution was injected into the coronal portion. After 2 days, copper sulfate was measured by an atomic absorption spectrophotometer. The teeth were then immersed in 2% methylene blue for 24 hours, sectioned and the extent of dye penetration was measured by a stereomicroscope.Results: The maximum and minimum recorded copper ion concentrations for the experimental group were 18.37 and 2.87ppm respectively. The maximum and minimum recorded dye penetrations for the experimental group were 8.5 and 3.5mm respectively. The statistical analysis, adopting paired samples test, showed poor correlation between average recorded results of two methods.Conclusion: Based on our results, there was no significant correlation between

  2. Processes and materials for photovoltaic applications. Workshop; Verfahren und Materialien fuer die Photovoltaik. Workshop

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2001-07-01

    Solar energy will surely continue to be the most important renewable energy source. Since 1985, solar cell production has doubled every five years while the per unit price decreased continuously. This trend is expected to continue. Germany made important contributions both in the construction of new solar cell production plants and in the development of new PV materials and material combinations, as well as in technology and PV plant construction. The states of Thuringia and Saxony were significant contributors. In Thuringia, two solar cell production plants were constructed, while Saxon vacuum coating technology was used in nearly all new German production plants. This workshop presented the activities in Thuringia in Saxony. Contacts were to be established between partners from industry and research, joint projects were to be initiated, and society and politicians were to be informed on the success and new chances achieved. The workshop was held on the occasion of the termination of construction and the starting of experimental production of the ANTEC Solar GmbH factory at Rudisleben. [German] Im Mix der erneuerbaren Energien spielt die Solarenergie kuenftig wohl die wichtigste Rolle. Seit 1985 verdoppelt sich die Solarzellenproduktion in jeweils fuenf Jahren, gleichzeitig sank der Preis pro Leistungseinheit kontinuierlich. Dieser Trend wird weiter anhalten. Deutschland leistete in den letzten Jahren wichtige Beitraege zu dieser Entwicklung, sowohl beim Aufbau neuer Fertigungskapazitaeten fuer Solarzellen, als auch bei der Entwicklung neuer Photovoltaik-Materialien bzw. -Materialkombinationen und auf den Gebieten der Technologie und des Anlagenbaus. Der Anteil Thueringens und Sachsens an dieser positiven Entwicklung ist groesser als generell vermutet. In Thueringen entstanden zwei Unternehmen fuer die Solarzellenproduktion, der saechsische Vakuumbeschichtungs-Anlagenbau war am Aufbau fast aller neuen deutschen Fertigungsstaetten beteiligt. Auf dem Workshop werden

  3. Research for the thermal change. Contributions; Forschung fuer die Waermewende. Beitraege

    Energy Technology Data Exchange (ETDEWEB)

    Szczepanski, Petra; Wunschick, Franziska; Martin, Niklas (comps.)

    2016-05-15

    The energy transition in the heating sector is not a sure-fire success and it is too slow. This is alarming since the heating / cooling sector is responsible for more than half of the final energy demand. That the ''thermal change'' has accelerated hardly despite many efforts by politics, industry and research in recent years, is the reason for the scientists the FVEE institutes to examine the perspectives of renewable energy and the need to increase efficiency in the heating sector systematically. therefore FVEE-2015 Annual Meeting, is entitled ''Research for the thermal change''. The contributions of this conference proceedings present the latest research results and show ways to implement the heat change technically, economically and politically. They are dedicated to the drivers, but also the barriers of heat change. The authors report on innovative projects to provide buildings with heat from geothermal energy, biomass and solar thermal energy. Several contributions are dedicated to the application of efficient components, such as thermal insulation, thermal storage and heat pumps. [German] Die Energiewende im Waermesektor ist kein Selbstlaeufer und kommt zu langsam voran. Das ist alarmierend, da der Waerme-/Kaeltesektor fuer ueber die Haelfte des Endenergiebedarfs verantwortlich ist. Dass die ''Waermewende'' trotz vielerlei Bemuehungen von Politik, Industrie und Forschung in den letzten Jahren kaum Fahrt aufgenommen hat, ist Anlass fuer die Wissenschaftlerinnen und Wissenschaftler der FVEE-Institute, die Perspektiven der erneuerbaren Energien und der notwendigen Effizienzsteigerung im Waermesektor systematisch zu untersuchen. Die FVEE-Jahrestagung 2015 steht deshalb unter dem Leitthema ''Forschung fuer die Waermewende''. Die Beitraege dieses Tagungsbandes praesentieren aktuelle Forschungsergebnisse und zeigen Wege auf, um die Waermewende technisch, wirtschaftlich und politisch

  4. Assessing preferential flow by simultaneously injecting nanoparticle and chemical tracers

    KAUST Repository

    Subramanian, S. K.

    2013-01-01

    The exact manner in which preferential (e.g., much faster than average) flow occurs in the subsurface through small fractures or permeable connected pathways of other kinds is important to many processes but is difficult to determine, because most chemical tracers diffuse quickly enough from small flow channels that they appear to move more uniformly through the rock than they actually do. We show how preferential flow can be assessed by injecting 2 to 5 nm carbon particles (C-Dots) and an inert KBr chemical tracer at different flow rates into a permeable core channel that is surrounded by a less permeable matrix in laboratory apparatus of three different designs. When the KBr tracer has a long enough transit through the system to diffuse into the matrix, but the C-Dot tracer does not, the C-Dot tracer arrives first and the KBr tracer later, and the separation measures the degree of preferential flow. Tracer sequestration in the matrix can be estimated with a Peclet number, and this is useful for experiment design. A model is used to determine the best fitting core and matrix dispersion parameters and refine estimates of the core and matrix porosities. Almost the same parameter values explain all experiments. The methods demonstrated in the laboratory can be applied to field tests. If nanoparticles can be designed that do not stick while flowing through the subsurface, the methods presented here could be used to determine the degree of fracture control in natural environments, and this capability would have very wide ranging value and applicability.

  5. Testing fundamentals: The chemical state of geochemical tracers in biominerals.

    Science.gov (United States)

    Branson, O.; Redfern, S. A. T.; Read, E.; Elderfield, H.

    2015-12-01

    The use of many carbonate-derived geochemical proxies is underpinned by the assumption that tracer elements are incorporated 'ideally' as impurities the mineral lattice, following relatively straightforward kinetic and thermodynamic drives. This allows comparison to inorganic precipitation experiments, and provides a systematic starting point from which to translate geochemical tracers to environmental records. Biomineral carbonates are a prominent source of geochemical proxy material, and are far from an ideal inorganic system. They are structurally and compositionally heterogeneous mineral-organic composites, produced in tightly controlled biological environments, possibly via non-classical crystal growth mechanisms. Biominerals offer numerous opportunities for tracers to be incorporated in a 'non-ideal' state. For instance, tracers could be hosted within the organic component of the structure, in interstitial micro-domains of a separate mineral phase, or in localized high-impurity clusters. If a proxy element is hosted in a non-ideal state, our understanding of its incorporation and preservation is flawed, and the theoretical basis behind the proxies derived from it must be reevaluated. Thus far, the assumption of ideal tracer incorporation has remained largely untested, owing to the spatial resolution and sensitivity limits of available techniques. Developments in high-resolution, high-sensitivity X-ray spectroscopy at Scanning Transmission X-Ray Microscopes (STXMs) have allowed us to measure trace element coordination in foraminiferal calcite, at length-scales relevant to biomineralisation processes and tracer incorporation. This instrument has allowed us to test the fundamental assumptions behind several geochemical proxy elements. We present a summary of four STXM studies, assessing the chemical state and distribution of Mg (Branson et al, 2014), B (Branson et al, 2015), S and Na (unpub.), and highlight the implications of these data for the use of these

  6. Multiple Tracer Tests in Porous Media During Clogging

    Science.gov (United States)

    Englert, A.; Banning, A.; Siegmund, J.; Freye, S.; Goekpinar, T.

    2015-12-01

    Transport processes are known to be governed by the physical and chemical heterogeneity of the subsurface. Clogging processes can alter this heterogeneity as function of time and thus can modify transport. To understand transport under clogging conditions and to unravel the potential of multiple tracer tests to characterize such transport process we perform column and sandbox experiments. Our recently developed column and sandbox experiments are used to perform multiple tracer tests during clogging. In a first set of experiments, a cubic cell of 0.1 m x 0.1 m x 0.1 m is used to experimentally estimate flow and transport characteristics of an unconsolidated sediment through Darcy and tracer experiments. The water streaming through the experiment is amended with ammonium sulfate permanently. Salt tracers are added to the streaming water repeatedly, to be detected at micro electrodes at the inflow and the outflow of the cubic cell. Through repeated syringe injections of a barium chloride solution into the center of the cubic cell clogging processes are forced to occur around the mixing zone of the injected and streaming water by precipitation of barium sulfate. In a second set of experiments, a sandbox model including a sediment body of 0.3 m x 0.3 m x 0.1 m is used. Tracer, streaming, and injection water chemistry is kept similar to the cubic cell experiments. However, tracer breakthrough is now detected at nine positions within the experiment and at the inflow and the outflow of the sandbox model. Injection of barium chloride solution is now at two locations around the center of the sandbox model. Flow and transport characteristics of the sediment body are estimated based on Darcy and tracer experiments, which are performed repeatedly. Combined analysis of local and ensemble breakthrough curves and integrated numerical modeling will be used to understand effective and local flow and transport in a in a porous medium during clogging.

  7. Diode laser photometer for process gas analysis in the near infrared; Diodenlaserphotometer im Nahen Infrarot fuer die Prozessanalyse

    Energy Technology Data Exchange (ETDEWEB)

    Cerff, K.

    1991-09-01

    A process photometer for the near infrared is designed taking into account the spectral properties of eligible heteropolar molecular compounds as well as the properties exhibited by commercially available diode lasers for communication engineering at 1.3 and 1.5 {mu}m, respectively. Compared with the conventional systems, this new process photometer has a high selectivity. Two frequency tuning methods are investigated. On the basis of the values measured, the method suitable for the InGaAs(P) diode lasers is determined. This method is then compared with that used for cooled lead salt diode lasers. A special method for the calculation of the hydrogen fluoride concentration with a reduced expenditure is examined for the occurrence of an additional water absorption line. This method is based on the use of the computer already incorporated in the analog device version. Subsequently, the analog device unit tested under operating conditions in the stack of our industrial cooperation partner is described. By means of error assessment, a 1{sigma} standard deviation of 0.066 mg HF/Ncbm is obtained for this version in case of a 100-h measurement. The lower limit of detection of photometer systems with thermal optical sources is 36 mg HF/Ncbm. When using the diode laser photometer presented in this report, this value is reduced to 0.5 mg/Ncbm. (orig./BBR). [Deutsch] Die Konzeption eines gegenueber herkoemmlichen Systemen hochselektiven Prozessphotometers fuer den spektralen Bereich des Nahen Infrarot wird in Abhaengigkeit von den spektralen Eigenschaften der in Frage kommenden heteropolaren Molekuelverbindungen sowie den Eigenschaften der kommerziell verfuegbaren Diodenlaser der Nachrichtentechnik bei 1.3 und 1.5 {mu}m erarbeitet. Zwei Frequenzabstimmverfahren werden untersucht, anhand von Messungen wird das fuer die InGaAs(P)-Diodenlaser geeignete Verfahren ermittelt und gegenueber demjenigen fuer gekuehlte Bleisalz-Diodenlaser abgegrenzt. Ein spezielles Verfahren zur

  8. Intercomparison of radon gas detectors 1999 and 2000 at PSI; Die Vergleichsmessungen 1999 und 2000 fuer Radongasmessgeraete am PSI

    Energy Technology Data Exchange (ETDEWEB)

    Schuler, Christoph; Butterweck, Gernot

    2000-10-01

    This report describes the results of two radon intercomparison exercises performed by the Reference Laboratory for Radon Gas Activity Concentration Measurements at Paul Scherrer Institut from Sep 9th to Oct 6th, 1999, and from March 21st to 28th, 2000. Radon gas detectors and instruments were exposed in the PSI Radon Chamber in reference atmospheres to 1060 kBqhm{sup -3} radon gas exposure at an average radon gas concentration of 6400 Bqm{sup -3} and to 2050 kBqhm{sup -3} radon gas exposure at an average radon gas concentration of 12500 Bqm{sup -3}, respectively. These intercomparison exercises determined the performance of electret ionisation chambers, track etch detectors and measuring instruments at high humidity (1999 Intercomparison Exercise) and at a high radon gas exposure (2000 Intercomparison Exercise). In the 1999 Intercomparison Exercise, electret ionisation chambers revealed an influence on high humidity. This effect may be due to impurities on a microscopic scale on the electrets of these detectors. With few exceptions, in both the 1999 and the 2000 Radon Intercomparison Exercise the deviations of the measurement results to the reference radon gas concentration values were less than 15% (traceability criterion) and the standard deviation of the results of five detectors less than 15% (reproducibility criterion). (author) [German] Im Referenzlabor fuer Radongas-Konzentrationsmessungen des PSI, welches der Eichstelle fuer Strahlenschutzmessgeraete des PSI angegliedert und seit 1997 vom Eidgenoessischen Amt fuer Messwesen akkreditiert ist, werden zur Ueberpruefung von Rueckverfolgbarkeit und Reproduzierbarkeit von Messresultaten Vergleichsmessungen durchgefuehrt. Kandidaten fuer die Teilnahme an diesen Vergleichsmessungen sind Firmen, Institutionen oder Privatpersonen, welche die Anerkennung des Bundesamtes fuer Gesundheit als Radongasmessstelle besitzen und deshalb nachweisen muessen, dass die geforderte Rueckverfolgbarkeit der Messresultate auf national

  9. Materials data for fatigue life calculation of steel sheet structures for automotive engineering; Werkstoffkennwerte fuer die Lebensdauerberechnung von Strukturen aus Stahlfeinblechen fuer den Automobilbau

    Energy Technology Data Exchange (ETDEWEB)

    Sonsino, C.M.; Kaufmann, H. [Fraunhofer-Institut fuer Betriebsfestigkeit LBF, Darmstadt (Germany); Masendorf, R.; Hatscher, A.; Zenner, H. [Institut fuer Maschinelle Anlagentechnik und Betriebsfestigkeit (IMAB), Clausthal-Zellerfeld (Germany); Bork, C.P. [Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin (Germany); Hinterdorfer, J. [Voestalpine Stahl GmbH, Linz (Austria); Sonne, H.M. [ThyssenKrupp Stahl AG, Duisburg (Germany); Engl, B. [MgF Magnesium Flachprodukte GmbH, Dortmund (Germany); Steinbeck, G. [Stahlinstitut VDEh, Duesseldorf (Germany)

    2004-08-01

    Within a joint project of the steel and automotive industry 17 steel sheet materials for automotive engineering in various delivery and forming conditions at temperatures of -40 C, 22 C and 100 C were investigated. In the course of 37 test series strain controlled fatigue curves to crack initiation and stress-strain-curves under monotonic and cyclic loading were determined. All experimental data, hysteresis loops and determined cyclic properties are available in a database. A correlation between the mechanical properties from tensile tests and the properties from strain controlled cyclic experiments seems to be possible. (Abstract Copyright [2004], Wiley Periodicals, Inc.) [German] Im Rahmen eines gemeinschaftlichen Projektes der Stahl- und Automobilindustrie wurden fuer 17 Stahlfeinbleche des Automobilbaus in verschiedenen Anlieferungs- und Verformungszustaenden unter -40 C, Raumtemperatur und +100 C mit 37 Versuchsreihen Anrisswoehlerlinien und zuegige bzw. zyklische Spannung-Dehnung-Kurven bestimmt. Saemtliche Versuchspunkte, Hysteresen und ermittelte zyklische Kennwerte liegen in einer Datenbank vor. Eine Korrelationen zwischen den Kennwerten aus dem Zugversuch und den Kennwerten aus den zyklischen, dehnungsgeregelten Versuchen ist grundsaetzlich moeglich. (Abstract Copyright [2004], Wiley Periodicals, Inc.)

  10. TracerLPM (Version 1): An Excel® workbook for interpreting groundwater age distributions from environmental tracer data

    Science.gov (United States)

    Jurgens, Bryant C.; Böhlke, J.K.; Eberts, Sandra M.

    2012-01-01

    TracerLPM is an interactive Excel® (2007 or later) workbook program for evaluating groundwater age distributions from environmental tracer data by using lumped parameter models (LPMs). Lumped parameter models are mathematical models of transport based on simplified aquifer geometry and flow configurations that account for effects of hydrodynamic dispersion or mixing within the aquifer, well bore, or discharge area. Five primary LPMs are included in the workbook: piston-flow model (PFM), exponential mixing model (EMM), exponential piston-flow model (EPM), partial exponential model (PEM), and dispersion model (DM). Binary mixing models (BMM) can be created by combining primary LPMs in various combinations. Travel time through the unsaturated zone can be included as an additional parameter. TracerLPM also allows users to enter age distributions determined from other methods, such as particle tracking results from numerical groundwater-flow models or from other LPMs not included in this program. Tracers of both young groundwater (anthropogenic atmospheric gases and isotopic substances indicating post-1940s recharge) and much older groundwater (carbon-14 and helium-4) can be interpreted simultaneously so that estimates of the groundwater age distribution for samples with a wide range of ages can be constrained. TracerLPM is organized to permit a comprehensive interpretive approach consisting of hydrogeologic conceptualization, visual examination of data and models, and best-fit parameter estimation. Groundwater age distributions can be evaluated by comparing measured and modeled tracer concentrations in two ways: (1) multiple tracers analyzed simultaneously can be evaluated against each other for concordance with modeled concentrations (tracer-tracer application) or (2) tracer time-series data can be evaluated for concordance with modeled trends (tracer-time application). Groundwater-age estimates can also be obtained for samples with a single tracer measurement at one

  11. In situ measurement of flow characteristics of natural saline rock in loose zones for gas and saline solutions in given rock stress conditions. Final report; In-situ-Ermittlung von Stroemungskennwerten natuerlicher Salzgesteine in Auflockerungszonen gegenueber Gas und Salzloesungen unter den gegebenen Spannungsbedingungen im Gebirge. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Haefner, F.; Belohlavek, K.U.; Behr, A.; Foerster, S.; Pohl, A.

    2001-04-01

    A method and equipment were developed for measuring the extension of loose zones around worked areas in saline rock and for in situ measurement of very small permeabilities and porosities in these zones. The experiments are based on unsteady borehole logs with flowing gases or liquids with special multiple pack systems that enable measurements from 4 cm to 15 m from the cavern contour. The measurements were evaluated by a specially developed software with automatic parameter identification. Permeabilities were identified between 10{sup 14} m{sup 2} and the detection limit of 10{sup 24} m{sup 2} and effective porosities of less than 0.1% at experimental times of several minutes up to several days. The logs were made in 3 mines in Stassfurt rock salt at depths of 700 and 500 m with different geological and geomechanical boundary conditions, worked in different ways and for different periods of time (between a few days and 37 years). Some of the findings were validated by ultrasonic measurements. [German] Fuer die Ermittlung der Ausdehnung von Auflockerungszonen um bergmaennisch aufgefahrene Strecken/Hohlraeume im Salzgestein und zur In-situ-Bestimmung kleinster Permeabilitaeten und Porositaeten in diesen Bereichen wurde ein Verfahren und eine praktikable Versuchsausruestung entwickelt. Diese eignet sich auch fuer Frac-Untersuchungen. Basis der Versuchsdurchfuehrungen sind instationaere Bohrlochuntersuchungen mit Gasen oder Fluessigkeiten als Stroemungsfluid unter Einsatz spezieller Mehrfachpackersysteme. Damit sind Messungen ab 4 cm Abstand zur Hohlraumkontur bis zu 15 m moeglich. Die Versuchsauswertung erfolgt mittels einer speziell entwickelten Software mit automatischer Parameteridentifikation, die die instationaere Stroemung um die Versuchsbohrung raeumlich vollstaendig beschreibt. Permeabilitaeten wurden je nach Abstand zur Hohlraumkontur zwischen 10{sup -14} m{sup 2} und der Nachweisgrenze 10{sup -24} m{sup 2} und effektive Porositaeten bis <0,1% ermittelt, bei

  12. Natural organic compounds as tracers for biomass combustion in aerosols

    Energy Technology Data Exchange (ETDEWEB)

    Simoneit, B.R.T. [Brookhaven National Lab., Upton, NY (United States)]|[Oregon State Univ., Corvallis, OR (United States). Coll. of Oceanic and Atmospheric Sciences; Abas, M.R. bin [Brookhaven National Lab., Upton, NY (United States)]|[Univ. of Malaya, Kuala Lumpur (Malaysia); Cass, G.R. [Brookhaven National Lab., Upton, NY (United States)]|[California Inst. of Tech., Pasadena, CA (United States). Environmental Engineering Science Dept.; Rogge, W.F. [Brookhaven National Lab., Upton, NY (United States)]|[Florida International Univ., University Park, FL (United States). Dept. of Civil and Environmental Engineering; Mazurek, M.A. [Brookhaven National Lab., Upton, NY (United States); Standley, L.J. [Academy of Natural Sciences, Avondale, PA (United States). Stroud Water Research Center; Hildemann, L.M. [Stanford Univ., CA (United States). Dept. of Civil Engineering

    1995-08-01

    Biomass combustion is an important primary source of carbonaceous particles in the global atmosphere. Although various molecular markers have already been proposed for this process, additional specific organic tracers need to be characterized. The injection of natural product organic tracers to smoke occurs primarily by direct volatilization/steam stripping and by thermal alteration based on combustion temperature. The degree of alteration increases as the burn temperature rises and the moisture content of the fuel decreases. Although the molecular composition of organic matter in smoke particles is highly variable, the molecular structures of the tracers are generally source specific. The homologous compound series and biomarkers present in smoke particles are derived directly from plant wax, gum and resin by volatilization and secondarily from pyrolysis of biopolymers, wax, gum and resin. The complexity of the organic components of smoke aerosol is illustrated with examples from controlled burns of temperate and tropical biomass fuels. Burning of biomass from temperate regions (i.e., conifers) yields characteristic tracers from diterpenoids as well as phenolics and other oxygenated species, which are recognizable in urban airsheds. The major organic components of smoke particles from tropical biomass are straight-chain, aliphatic and oxygenated compounds and triterpenoids. The precursor-to-product approach of organic geochemistry can be applied successfully to provide tracers for studying smoke plume chemistry and dispersion.

  13. Development of radioisotope tracer technology and nucleonic control system

    Energy Technology Data Exchange (ETDEWEB)

    Jin, Joon Ha; Lee, Myun Joo; Jung, Sung Hee and others

    1999-04-01

    The purpose of this study is to develop the radioisotope tracer technology, which can be used in solving industrial and environmental problems and basic technology of nuclear control systems that are widely used for automation of industrial plants, and to build a strong tracer group to support the local industries. In relation to the tracer technology, the data acquisition system, the column scanning equipment and the detection pig for a leakage test have been developed. In order to use in analyzing data of tracer experiments, a computer program for the analysis of residence time distribution has been created as well. These results were utilized in developing the tracer technologies, such as the column scanning, the flow measurement using the dilution method, the simultaneous monitoring rotational movement of piston rings and the optimization of a waste water treatment facility, and the technologies were successfully demonstrated in the local industrial. The stripper of RFCC reactor has been examined to find an unwanted structure in it by imminent request from the industry. Related to the development of nucleonic control system, the state of art report on the technology has been written and an equipment for the analysis of asphalt content has been developed. (author)

  14. Passive Tracer Dynamics in 4 Point-Vortex Flow

    CERN Document Server

    Laforgia, A; Kuznetsov, L V; Zaslavsky, G M

    2000-01-01

    The advection of passive tracers in a system of 4 identical point vortices is studied when the motion of the vortices is chaotic. The phenomenon of vortex-pairing has been observed and statistics of the pairing time is computed. The distribution exhibits a power-law tail with exponent (\\sim 3.6), implying finite average pairing time. Tracer motion is studied for a chosen initial condition of the vortex system. Accessible phase space is investigated. The size of the cores around the vortices is well approximated by the minimum inter-vortex distance and stickiness to these cores is observed. We investigate the origin of stickiness which we link to the phenomenon of vortex pairing and jumps of tracers between cores. Motion within the core is considered and fluctuations are shown to scale with tracer-vortex distance (r) as (r^{6}). No outward or inward diffusion of tracers are observed. This investigation allows the separation of the accessible phase space in four distinct regions, each with its own specific prop...

  15. Innovative roller bearings for transmissions in heavy-duty drives; Innovative Waelzlagertechnik fuer Kupplungen in Schwerantrieben

    Energy Technology Data Exchange (ETDEWEB)

    Asch, A.; Lindenthal, H. [Voith Turbo GmbH und Co. KG, Heidenheim (Germany)

    2001-07-01

    Universal joint couplings are used, e.g. in heavy-duty drives in rolling plants where hitch shock loads occur. They must be designed for maximum momentum capacity. As a rule, roller bearings have higher transmission efficiencies than sliding element bearings. The contribution describes a new technology for longer life of the bearings in which the protective effects of the universal joint are considered. [German] Kreuzgelenke sind Ausgleichskupplungen, die beispielsweise in stossbelasteten Schwerantrieben der Walzwerkstechnik eingesetzt werden. Bei diesen Schwerantrieben muessen sie in erster Linie fuer hoechste Drehmomentkapazitaet ausgelegt werden. Waelzlager bieten dabei generell hoehere Uebertragungswirkungsgrade als Alternativen mit Gleitelementen. Der Beitrag stellt eine neue Entwicklung zur gezielten Steigerung der Lagerlebensdauer vor, bei der Stuetzwirkungen der Gelenkkonstruktion beruecksichtigt werden. (orig.)

  16. Study on the potential of a solar furnace gasifier; Potentialstudie fuer einen Sonnenofenvergaser

    Energy Technology Data Exchange (ETDEWEB)

    Kubiak, H.; Jagnow, H.J.; Papamichalis, A. [DTM-Gesellschaft fuer Forschung und Pruefung mbH, Essen (Germany)

    1997-12-31

    This study attempts to determine the potential of a solar furnace gasifier on the basis of whether direct irradiation with concentrated sunlight produces sufficient reaction heat. In phase 1 of the present multi-stage development project the study concentrates on the elaboration of a concept for a small-scale gasifier with a throughput of 1 kg biomass / h. It delineates problem areas which still pose an obstacle to the final detail planning of the reactor and require a minimal-cost solution. (orig./MM) [Deutsch] In dieser Potentialstudie wird geprueft, inwieweit durch Direkteinkopplung hochkonzentrierter Solarstrahlung in einen Vergasungsreaktor die erforderliche Reaktionswaerme bereitgestellt werden kann. Die Untersuchungen konzentrieren sich in der Phase 1 des mehrstufigen Entwicklungsvorhabens auf die Erstellung des Konzeptengineerings fuer eine Kleinvergasungsapparatur mit einem Durchsatz von 1 kg/h Biomasse. Dabei werden die Problembereiche herausgearbeitet, die einer zuverlaessigen Detailplanung des Reaktors noch entgegenstehen und einer moeglichst oekonomischen Loesung zugefuehrt werden muessen. (orig./MM)

  17. Transparent thermal insulation. Solar shells in lightweight construction; Daemmen mit Licht. Solarfassaden fuer Leichtbauweisen

    Energy Technology Data Exchange (ETDEWEB)

    Palfi, M. [ESA - Energy Systeme Aschauer, Linz (Austria)

    1999-07-01

    While thermal insulation prevents transmissive heat loss, it also prevents utilisation of the incident solar energy. A further reduction of energy loss is only possible with thicker insulating layers. Solar shells provide an option for integrating thermal insulation and solar energy use. The contribution describes a new lighweight solar shell for a single-family building near Linz, Austria. [German] In den meisten Faellen vermindert die Waermedaemmung von Gebaeuden zwar Transmissionsverluste, verhindert jedoch die Nutzung der auftreffenden Sonnenenergie. Eine weitere Senkung der Energieverluste an der Fassade ist bei ueblichen Daemmungen nur durch eine Erhoehung der Daemmstaerke moeglich. Mit der Solarfassade wurde ein Weg gefunden, der die Ansaetze des Daemmens und die Ansaetze des solaren Bauens miteinander in oekologisch sinnvoller Weise verknuepft. Erstmals steht dieses Daemmsystem auch fuer Leichtbauweisen zur Verfuegung. Der Autor erlaeutert in seinem Beitrag die Funktionen der Solarfassade anhand eines realisierten Einfamilienhauses bei Linz. (orig.)

  18. Corrosion damage at storage tanks for salt brine; Korrosionsschaeden an Lagertanks fuer Salzlake

    Energy Technology Data Exchange (ETDEWEB)

    Burkert, A.; Mietz, J. [Bundesanstalt fuer Materialforschung und -pruefung (BAM) Unter den Eichen 87, D-12205 Berlin (Germany)

    2003-02-01

    A tank made of stainless steel type X2CrNiMo17-12-2 for intermediate storage of salt brine for cheese production revealed significant pitting corrosion effects shortly after commissioning although comparable units have shown positive long-term behaviour. By means of electrochemical laboratory tests it could be demonstrated that the observed pitting corrosion was caused by the use of an oxidizing agent for desinfection purposes. (Abstract Copyright [2003], Wiley Periodicals, Inc.) [German] An einem Tankbehaelter aus dem Werkstoff X2CrNiMo17-12-2, der zur Zwischenlagerung von Salzlake fuer die Kaeseherstellung dient, wurden trotz langjaehriger positiver Erfahrungen an vergleichbaren Anlagen bereits kurze Zeit nach der Inbetriebnahme Lochkorrosionserscheinungen festgestellt. Durch entsprechende elektrochemische Laboruntersuchungen konnte gezeigt werden, dass die vorgefundene Lochkorrosion durch den Einsatz eines Oxidationsmittels zu Desinfektionszwecken verursacht wurde. (Abstract Copyright [2003], Wiley Periodicals, Inc.)

  19. Fluid mechanics for mechanical engineering. Technology and examples; Stroemungslehre fuer den Maschinenbau. Technik und Beispiele

    Energy Technology Data Exchange (ETDEWEB)

    Siekmann, H.E. [Technische Univ. Berlin (Germany). Hermann-Foettinger-Institut fuer Stroemungsmechanik

    2001-07-01

    The book complements the established fluid mechanics textbook. It discusses the same subjects but goes into more detail and contains many practical examples. It addresses students of engineering, physics and practically oriented mathematics and can be used for independent studying or for a deeper understanding of subject matter treated in university lectures. [German] Der Band stellt als Ergaenzung zum eingefuehrten Grundlagenbuch Stroemungslehre eine tiefergehende Behandlung des Vorlesungsstoffes dar. Die Einteilung der Kapitel entspricht im wesentlichen der im Band Grundlagen: Hydrostatik, Kinematik, Impulssatz, NAVIER-Stokes-Bewegungsgleichung, Potential-, Wirbel- und Grenzschichtstroemung sowie turbulente Stroemung. Das Buch schliesst mit Darstellungen ueber Rohrstroemungen, Umstroemungen von Koerpern, Aehnlichkeitsgesetzen und numerische Stroemungsberechnung. Es enthaelt zahlreiche Praxisbeispiele. Geeignet fuer Studenten der Ingenieurwissenschaften, Physiker und praxisorientierte Mathematiker zum Selbststudium sowie zur Vorlesungsbegleitung. (orig.)

  20. Mixed air ceilings for surgical rooms with recirculating blowers; Mischluftdecke fuer OP-Raeume mit Umluftventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2001-07-01

    Ceilings of modern surgery rooms must have a size of about 3,200 x 3,200 mm for a laminar displacement flow of 0.18 - 0.25 m/s. air volume flows of more than 9,000 cubic metres per hour are required. Not all surgical wards have the capacity for sufficiently large air ducts for central air supply. [German] Die moderne Chirurgie verlangt OP-Zuluftdecken mit Groessen von etwa 3 200 x 3 200 mm, die eine laminare Verdraengungsstroemung im Geschwindigkeitsbereich von etwa 0,18 bis 0,25 m/s sichern. Hierbei werden Zuluft-Volumenstroeme bis ueber 9 000 m{sup 3}/h erforderlich. Nicht alle OP-Abteilungen lassen die Verlegung der entsprechend grossen Luftleitungen fuer zentrale Luftversorgung zu. (orig.)

  1. Co-operative research for future energy supply; Gemeinsam Forschen fuer die Energie der Zukunft

    Energy Technology Data Exchange (ETDEWEB)

    Stadermann, G.; Szczepanski, P. (comps.)

    2000-10-01

    The FVS ForschungsVerbund Sonnenenergie was founded in 1990 and covers the whole spectrum of solar and renewable energy sources, from solid state physics to agriculture and technology assessment. [German] Seit der Entstehnung des FVS ForschungsVerbund Sonnenenergie haben sich die Rahmenbedingungen fuer die Erforschung der solaren und erneuerbaren Energien verbessert: Sie wurden in den letzten Jahren weiter erschlossen und haben an Bekanntheit und Sympathie gewonnen. Die von der Bundesregierung angestrebte Energiewende bedeutet eine Zaesur in der deutschen Energieversorgung und fuehrt zu einer staerkeren Foerderung erneuerbarer Energien. Sie werden zunehmend als markt- und zukunftsfaehiger Wirtschaftsfaktor wahrgenommen, zu dessen Erschliessung intensive Forschung und Entwicklung notwendig ist. Der Verbund gewinnt daher verstaerkt die Industrie und die Energiewirtschaft als Kooperationspartner im Forschungssektor. Das Themenspektrum im FVS ForschungsVerbund Sonnenenergie umfasst weitgehend alle solaren und erneuerbaren Energien. Diese Themen beinhalten eine Fuelle von einzelnen wissenschaftlichen Problemstellungen von der Festkoerperphysik bis zu agrarwissenschaftlichen Fragen nachwachsender Energierohstoffe und zur Technologiebewertung. (orig.)

  2. Electrochemical storage systems for renewable power supply systems. Workshop; Elektrochemische Speichersysteme fuer regenerative Energieversorgungsanlagen. Workshop

    Energy Technology Data Exchange (ETDEWEB)

    Garche, J.; Hoehe, W. [Zentrum fuer Sonnenenergie- und Wasserstoff-Forschung Baden-Wuerttemberg (ZSW), Ulm (Germany); Stadermann, G. [eds.] [Forschungsverbund Sonnenenergie, Berlin (Germany)

    1999-07-01

    This volume contains 26 contributions on batteries and PV systems. Vol. 1 discusses the following subjects: 1. Evaluation and assessment of the performance of battery systems in existing PV systems; 2. Status and prospects of storage systems; 3. Experience, requirements and markets; 4. Storage battery operation and assessment; 5. Systems engineering and operation of PV systems. [German] Dieser Band enthaelt 26 Beitraege zum aktuellen Stand der Batterien sowie der dazugehoerigen Systeme fuer Photovoltaik-Anlagen. Der Band ist in fuenf Themenbereiche unterteilt: 1. Auswertung und Bewertung des Betriebsverhaltens von Batteriesystemen in bestehenden PV-Anlagen; 2. Stand und Zukunft von Speichersystemen; 3.Erfahrungen, Anforderungen und Maerkte; 4. Speicher-Betriebsfuehrung und -Zustandsbestimmung; und 5. Systemtechnik und Betriebsfuehrung von PV-Systemen.

  3. Buckwheat for the production of biogas. Rediscover forgotten cultures; Buchweizen fuer die Biogasproduktion. Vergessene Kulturen wiederentdecken

    Energy Technology Data Exchange (ETDEWEB)

    Stockmann, Falko; Fritz, Maendy

    2011-07-01

    Buckwheat whole plant can be used for the production of biogas. Due to its short growing period, buckwheat can be integrated very variable in crop rotations. For example, buckwheat can be grown as a second crop in the summer. After the harvest of winter wheat, which is used as whole plant silage, the sowing date is around mid-June. The ingredients of buckwheat expect a good fermentability with corresponding biogas production. [German] Buchweizen-Ganzpflanzen koennen fuer die Erzeugung von Biogas genutzt werden. Durch seine kurze Vegetationsperiode laesst sich Buchweizen sehr variabel in Fruchtfolgen einbinden. Zum Beispiel kann Buchweizen als Zweitfrucht im Sommer angebaut werden. Nach der Ernte von Wintergetreide, das als Ganzpflanzensilage genutzt wird, liegt der Saattermin etwa Mitte Juni. Die Inhaltsstoffe von Buchweizen lassen eine gute Vergaerbarkeit mit einer entsprechenden Biogasproduktion erwarten.

  4. Investigation of nondestructive test methods for fabric belts; Erprobung von zerstoerungsfreien Pruefverfahren fuer Gewebegurte

    Energy Technology Data Exchange (ETDEWEB)

    Gronau, O. [Deutsche Montan Technologie GmbH, Bochum (Germany). Car Synergies Div.

    2001-07-01

    Markers (e.g. seams) on fabric belts may help to predict and analyze damage, as shown by Langebrake. The current investigations followed this up by ultrasonic investigations. Further investigations are required. [German] Das in Abschnitt 4.1 aufgefuehrte Verfahren zur Bestimmung der Abstaende von auf Gewebegurten aufgebrachten Markern (im vorliegenden Fall Draehte) eignet sich zur Voraussage von Gurtschaedigungen. Liegen die Gurtschaeden dicht an den Markern, so koennen diese direkt durch die Abstandsmessung, d.h. Spannungsmessung detektiert und bewertet werden. Grundlage hierfuer liefern die Ergebnisse aus dem Vorgaengervorhaben von Langebrake. Da jedoch die Markerabstaende nicht in kurzer Folge angebracht werden koennen, wurde ein zweites, ergaenzendes Verfahren zur zerstoerungsfreien Auffindung von Gurtschaeden getestet. Das hierfuer getestete Ultraschallpruefsystem fuer die Ankopplung ueber Luft konnte bereits gute Ergebnisse liefern. Jedoch konnten aufgrund der starken Ultraschallschwaechung nicht alle Gurtqualitaeten am Umlaufpruefstand getestet werden. Eine Durchschallung war nicht in jedem Falle moeglich. Weitere Untersuchungen sind daher notwendig und sollten in 2 Richtungen gefuehrt werden. (orig.)

  5. Technical conference on air, noise, and waste - current information for multipliers in industry. Current information for multipliers in industry; Fachtagung Luft, Laerm, Abfall - Aktuelle Informationen fuer Multiplikatoren der Wirtschaft. Aktuelle Informationen fuer Multiplikatoren der Wirtschaft

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2003-07-01

    The Bavarian Environmental Office informed on the new information and documentation centre for environmental technology and environmental management (IDZ), new amendments to air pollution abatement legislation and their implementation, experience from the practical application of the amended TA Laerm (Noise Regulation), the Ordinance on Noise Emitted by Equipment and Machines, and methods of supervising the disposal of classified waste according to the Ordinance on Waste from Small Industries (Gewerbeabfallverordnung). [German] DAs bayerische Landesamt fuer Umweltschutz informierte in der Tagung ueber: IDZ - Informations und Dokumentationszentrum fuer Umwelttechnologie und umweltmanagement, aktuelle Aenderungen der Gesetzgebung zur Luftreinhaltung und ihre Anwendung, Erfahrungen aus dem Vollzug der Aenderung der TA Laerm, Geraete und Maschinenlaermschutzverordnung und Nachweisverfahren ueber die Entsorgung ueberwachungsbeduerftiger Abfaelle in der Gewerbeabfallverordung. (uke)

  6. Telematics for hazardous goods transportation; Anwendungen fuer den Transport von kritischen Guetern

    Energy Technology Data Exchange (ETDEWEB)

    Stingl, D. [Danzas Logistics GmbH, Hamburg (Germany)

    1999-07-01

    In the course of the integration of the customer Langnese Iglo in autumn 1997 and in view of the already existing general conditions for the implementation of the equlations of the directive on food hygiene (HACCP-concept) as well as the permanently in reasing demand for quality of logistics DANZAS Logistics GmbH, cooperating closely with in deep-frozen goods customer Langnese-Iglo decided to develop a new system of quality assurance for the transportation of deep-frozen goods and apply this system to all its activities. First ideas about standard demands, technical solutions and multi-functional design showed that the project had to be handled in such a flexible way that temperature controlling (for the transportation of deep-frozen goods, temperature-controlled DANZAS-warehouses and all future temperature-controlled transportation) and the monitoring of security-relevant transportation can be integrated in one and the same project. (orig.) [German] Im Zuge der Integration des Kunden Langnese Iglo im Herbst 1997 und unter Beruecksichtigung der bereits vorliegenden Rahmenbedingungen zur Umsetzung der Bestimmungen der Lebensmittelhygieneverordnung (HACCP-Konzept) sowie des staendig wachsenden Qualitaetsanspruches an logistische Dienstleistungen, hat sich die DANZAS Logistics GmbH in enger Zusammenarbeit mit dem TK-Kunden Langnese Iglo entschlossen, ein innovatives System zur Qualitaetssicherung im Tiefkuehltransport zu erarbeiten und flaechendeckend einzusetzen. Die ersten Gedanken bezueglich Standardanforderungen, technischer Loesungsansaetze und multifunktionaler Ausrichtung zeigten, dass dieses Projekt so variabel zu gestalten ist, dass sowohl Temperaturcontrolling (fuer TK-Transporte, fuer die temperaturgefuehrten DANZAS-Laeger und zukuenftig alle temperaturgefuehrten Transporte) als auch die Ueberwachung sicherheitsrelevanter Transporte zu integrieren sind. (orig.)

  7. Mobile robots for use in nuclear facilities; Mobile Roboter fuer kerntechnische Anlagen

    Energy Technology Data Exchange (ETDEWEB)

    Haferkamp, H. [Inst. fuer Werkstoffkunde, Univ. Hannover (Germany); Bach, F.W. [Inst. fuer Werkstoffkunde, Univ. Hannover (Germany); Seevers, J. [Inst. fuer Werkstoffkunde, Univ. Hannover (Germany)

    1995-10-01

    The radiation exposure encountered in revisions and demolitions of some areas of nuclear facilities requires the use of remotely operated technical systems in order to avoid the personnel being exposed in the course of such work. The main activities conducted within such areas include inspecting, measuring, cleaning, cutting, and handling. The Institute for Materials Research (IW) of th University of Hannover, with its twenty years of experience in basic and application-oriented research and development in the field of thermal cutting, especially in plasma fusion cutting, and ten years of development of remotely operated handling systems, offers its services as a partner in solving these problems in nuclear plants. Besides stationary systems, IW has developed also mobile robots and manipulators able to move largely autonomously under remote control within a certain area. (orig.) [Deutsch] Die Revision und der Rueckbau von kerntechnischen Anlagen erfordern aufgrund der Strahlenexposition in einigen Bereichen fernbedienbare technische Systeme, so dass das Personal beim Verrichten von Taetigkeiten strahlungstechnisch nicht belastet wird. Die Aufgaben innerhalb solcher Bereiche sind im wesentlichen inspizieren, messen, reinigen, schneiden und handhaben. Das Institut fuer Werkstoffkunde (IW) der Universitaet Hannover mit seiner nunmehr zwanzigjaehrigen Erfahrung aus der Grundlagen- und anwendungsorientierten Forschung und Entwicklung auf dem Gebiet der thermischen Trenntechnik, insbesondere der Plasmaschmelzschneidtechnik, sowie der seit zehn Jahren betriebenen Entwicklung von fernbedienbaren Handhabungssystemen bietet sich als Partner fuer die Loesung dieser Aufgaben in kerntechnischen Anlagen an. Neben der Ausfuehrung von stationaeren Systemen wurden am IW mobile Roboter und Manipulatoren entwickelt, die sich fernbedient weitgehend autonom in einem bestimmten Bereich bewegen koennen. (orig.)

  8. Investigation of helical flow by using tracer technique

    Directory of Open Access Journals (Sweden)

    Hacıyakupoğlu S.

    2013-05-01

    Full Text Available The flow through coiled tubes is, in practice, important for pipe systems, heat exchangers, chemical reactors, mixers of different gas components, etc., and is physically interesting because of the peculiar characteristics caused by the centrifugal force. Therefore, it is not so easy to observe flow parameters in the helical pipe experimentally. Tracer techniques are being increasingly used to determine characteristics such as volume flow rate, residence time, dispersion and mixing process in industry. In this study, the flow in the helical pipe was obtained in the laboratory and investigated by using the tracer technique. The experimental system including the helical pipe was set up in the laboratory. In the experiments methylene-blue (C16H17N3S has been used as the tracer. The experiments were successfully performed with different flow rates and their results were evaluated with the flow parameters.

  9. Theoretical model of intravascular paramagnetic tracers effect on tissue relaxation

    DEFF Research Database (Denmark)

    Kjølby, Birgitte Fuglsang; Østergaard, Leif; Kiselev, Valerij G

    2006-01-01

    that the relaxivity of intravascular contrast agents depends significantly on the host tissue. This agrees with experimental data by Johnson et al. (Magn Reson Med 2000;44:909). In particular, the present results suggest a several-fold increase in the relaxivity of Gd-based contrast agents in brain tissue compared...... with bulk blood. The enhancement of relaxation in tissue is due to the contrast in magnetic susceptibility between blood vessels and parenchyma induced by the presence of paramagnetic tracer. Beyond the perfusion measurements, the results can be applied to quantitation of functional MRI and to vessel size......The concentration of MRI tracers cannot be measured directly by MRI and is commonly evaluated indirectly using their relaxation effect. This study develops a comprehensive theoretical model to describe the transverse relaxation in perfused tissue caused by intravascular tracers. The model takes...

  10. Preparation of intravenous cholesterol tracer using current good manufacturing practices.

    Science.gov (United States)

    Lin, Xiaobo; Ma, Lina; Racette, Susan B; Swaney, William P; Ostlund, Richard E

    2015-12-01

    Studies of human reverse cholesterol transport require intravenous infusion of cholesterol tracers. Because insoluble lipids may pose risk and because it is desirable to have consistent doses of defined composition available over many months, we investigated the manufacture of cholesterol tracer under current good manufacturing practice (CGMP) conditions appropriate for phase 1 investigation. Cholesterol tracer was prepared by sterile admixture of unlabeled cholesterol or cholesterol-d7 in ethanol with 20% Intralipid(®). The resulting material was filtered through a 1.2 micron particulate filter, stored at 4°C, and tested at time 0, 1.5, 3, 6, and 9 months for sterility, pyrogenicity, autoxidation, and particle size and aggregation. The limiting factor for stability was a rise in thiobarbituric acid-reacting substances of 9.6-fold over 9 months (P postproduction. CGMP manufacturing methods can be achieved in the academic setting and need to be considered for critical components of future metabolic studies.

  11. Statistical-dynamic climate forecast for Europe and Germany. Final report; Statistisch-dynamische Klimavorhersage fuer Europa und Deutschland. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Denhard, M.; Schoenwiese, C.D.

    2001-07-01

    Principal Correlation Pattern Analysis (PCPA) maps the local circulation, temperature and precipitation anomalies in the northern hemisphere in monthly resolution and permits an interpretation of their causes. Calculations are made for the El Nino phenomenon, NAO, and the quasi-11-year cycle of solar radiation variation. Especially the El Nino calculations show the efficiency of PCPA. [German] Mit Hilfe der Principal Correlation Pattern Analysis (PCPA) koennen die von verschiedenen Klimaantrieben erzeugten lokalen Zirkulations-, Temperatur- und Niederschlagsanomalien auf der Nordhemisphaere in monatlicher Aufloesung dargestellt und ursaechlich interpretiert werden. Diese Rechnungen wurden fuer das El Nino Phaenomen, die NAO und den quasi 11-jaehrigen Zyklus der solaren Strahlungsschwankungen durchgefuehrt. Insbesondere die Untersuchungen zu Wirkungen von El Nino auf Europa zeigen, dass die PCPA die Kopplungen eines Prozesses mit dem Klimasystem sehr genau beschreibt und somit die Voraussetzungen schafft, die Wirkungen dieses Klimaantriebs zu modellieren und ihn zur Vorhersage zu nutzen. Erste einfache Vorhersageexperimente fuer das europaeische Klima bestaetigen diese Aussage. (orig.)

  12. Gas generation from biomass for decentralized power supply systems; Gaserzeugung fuer dezentrale Energiesysteme auf der Basis von Biomasse

    Energy Technology Data Exchange (ETDEWEB)

    Kubiak, H.; Papamichalis, A.; Heek, K.H. van [DMT-Inst. fuer Kokserzeugung und Brennstofftechnik, Essen (Germany)

    1996-12-31

    By a reaction with steam, bioresidues and plants can be converted into a gas consisting mainly of hydrogen, carbon monoxide and methane which can be used for electric power generation in gas engines, gas turbins and fuel cells. The conversion processes, especially the fuel cell process, are environment-friendly and efficient. For decentralized applications (i.e. for biomass volumes of 0.5 to 1 t/h), an allothermal process is recommended which is described in detail. (orig) [Deutsch] Durch Reaktion mit Wasserdampf lassen sich Bioreststoffe und Energiepflanzen zu einem Gas umsetzen, das im wesentlichen aus Wasserstoff, Kohlenmonoxid und Methan besteht und z.B. ueber Gasmotoren, Gasturbinen, vorzugsweise aber Brennstoffzellen zu Strom umgewandelt werden kann. Die Umwandlungsverfahren, insbesondere unter Benutzung von Brennstoffzellen, sind umweltfreundlich und haben einen hohen Wirkungsgrad. Als Vergasungsverfahren eignet sich fuer die dezentrale Anwendung. - d.h. fuer eine Biomassemenge von 0,5 bis 1 t/h - insbesondere das hier beschriebene allotherme Verfahren. (orig)

  13. Dynamics and mechanics of bed-load tracer particles

    Directory of Open Access Journals (Sweden)

    C. B. Phillips

    2014-12-01

    Full Text Available Understanding the mechanics of bed load at the flood scale is necessary to link hydrology to landscape evolution. Here we report on observations of the transport of coarse sediment tracer particles in a cobble-bedded alluvial river and a step-pool bedrock tributary, at the individual flood and multi-annual timescales. Tracer particle data for each survey are composed of measured displacement lengths for individual particles, and the number of tagged particles mobilized. For single floods we find that measured tracer particle displacement lengths are exponentially distributed; the number of mobile particles increases linearly with peak flood Shields stress, indicating partial bed load transport for all observed floods; and modal displacement distances scale linearly with excess shear velocity. These findings provide quantitative field support for a recently proposed modeling framework based on momentum conservation at the grain scale. Tracer displacement is weakly negatively correlated with particle size at the individual flood scale; however cumulative travel distance begins to show a stronger inverse relation to grain size when measured over many transport events. The observed spatial sorting of tracers approaches that of the river bed, and is consistent with size-selective deposition models and laboratory experiments. Tracer displacement data for the bedrock and alluvial channels collapse onto a single curve – despite more than an order of magnitude difference in channel slope – when variations of critical Shields stress and flow resistance between the two are accounted for. Results show how bed load dynamics may be predicted from a record of river stage, providing a direct link between climate and sediment transport.

  14. How well do different tracers constrain the firn diffusivity profile?

    Directory of Open Access Journals (Sweden)

    C. M. Trudinger

    2013-02-01

    Full Text Available Firn air transport models are used to interpret measurements of the composition of air in firn and bubbles trapped in ice in order to reconstruct past atmospheric composition. The diffusivity profile in the firn is usually calibrated by comparing modelled and measured concentrations for tracers with known atmospheric history. However, in most cases this is an under-determined inverse problem, often with multiple solutions giving an adequate fit to the data (this is known as equifinality. Here we describe a method to estimate the firn diffusivity profile that allows multiple solutions to be identified, in order to quantify the uncertainty in diffusivity due to equifinality. We then look at how well different combinations of tracers constrain the firn diffusivity profile. Tracers with rapid atmospheric variations like CH3CCl3, HFCs and 14CO2 are most useful for constraining molecular diffusivity, while &delta:15N2 is useful for constraining parameters related to convective mixing near the surface. When errors in the observations are small and Gaussian, three carefully selected tracers are able to constrain the molecular diffusivity profile well with minimal equifinality. However, with realistic data errors or additional processes to constrain, there is benefit to including as many tracers as possible to reduce the uncertainties. We calculate CO2 age distributions and their spectral widths with uncertainties for five firn sites (NEEM, DE08-2, DSSW20K, South Pole 1995 and South Pole 2001 with quite different characteristics and tracers available for calibration. We recommend moving away from the use of a firn model with one calibrated parameter set to infer atmospheric histories, and instead suggest using multiple parameter sets, preferably with multiple representations of uncertain processes, to assist in quantification of the uncertainties.

  15. How well do different tracers constrain the firn diffusivity profile?

    Directory of Open Access Journals (Sweden)

    C. M. Trudinger

    2012-07-01

    Full Text Available Firn air transport models are used to interpret measurements of the composition of air in firn and bubbles trapped in ice in order to reconstruct past atmospheric composition. The diffusivity profile in the firn is usually calibrated by comparing modelled and measured concentrations for tracers with known atmospheric history. However, in some cases this is an under-determined inverse problem, often with multiple solutions giving an adequate fit to the data (this is known as equifinality. Here we describe a method to estimate the firn diffusivity profile that allows multiple solutions to be identified, in order to quantify the uncertainty in diffusivity due to equifinality. We then look at how well different combinations of tracers constrain the firn diffusivity profile. Tracers with rapid atmospheric variations like CH3CCl3, HFCs and 14CO2 are most useful for constraining molecular diffusivity, while δ15N2 is useful for constraining parameters related to convective mixing near the surface. When errors in the observations are small and Gaussian, three carefully selected tracers are able to constrain the molecular diffusivity profile well with minimal equifinality. However, with realistic data errors or additional processes to constrain, there is benefit to including as many tracers as possible to reduce the uncertainties. We calculate CO2 age distributions and their spectral widths with uncertainties for five firn sites (NEEM, DE08-2, DSSW20K, South Pole 1995 and South Pole 2001 with quite different characteristics and tracers available for calibration. We recommend moving away from the use of a single firn model with one calibrated parameter set to infer atmospheric histories, and instead suggest using multiple parameter sets, preferably with multiple representations of uncertain processes, to allow quantification of the uncertainties.

  16. Transmission paths information systems under open access. Developments in the USA; Lastflussinformationssysteme fuer den Wettbewerb. Entwicklungen in den USA

    Energy Technology Data Exchange (ETDEWEB)

    Florek, S. [Tennessee Valley Authority, Transmission/Power Supply, Chattanooga, TN (United States)

    1998-09-01

    Open access to transmission networks is a prerequisite of electricity trading in the deregulated power market. Another basic requirement for market efficiency is reliable transmission grid operation as well as transparency of operations for all parties involved. Therefore, transmission paths information systems are needed for ensuring reliable transfer operations. In the USA, the Transmission Interchange System (TIS) became operational in July 1997 as a load management system, which stores transmission operations for the various traders under open access by so-called transmission tags. Another feature for system monitoring is transmission security regions, within which security coordinators ensure reliable system operation. The security coordinators have access to all transmission paths information within the interconnected systems and thus are able to initiate load management measures for prevention of transfer bottlenecks or failures. The accompanying agreement defining responsibilities of network owners and users as well as operations pricing forms the legal basis of electricity trading in the deregulated market. (orig./CB) [Deutsch] Freier Zugang zum Uebertragungsnetz ist die Grundlage fuer einen funktionierenden Wettbewerb im Elektrizitaetshandel. Daher muss fuer einen effizienten Markt ein sicherer und zuverlaessiger Netzbetrieb gewaehrleistet sein. Dies ist nur moeglich, wenn jeder Netzbetreiber einen vollstaendigen Ueberblick ueber alle Uebertragungen erhaelt, die ueber sein Uebertragungsnetz abgewickelt werden. Lastflussinformationssysteme sind fuer einen sicheren Netzbetrieb unverzichtbar. Im Juli 1997 wurde das Transmission Interchange System (TIS) in den USA in Betrieb genommen und die Erfassung aller Uebertragungen im Hochspannungsnetz durch sogenannte Transmission Tags eingefuehrt. Zur Ueberwachung des Netzbetriebs wurden Transmission Security-Regionen definiert. Innerhalb dieser Regionen sind Security Coordinators fuer den sicheren Netzbetrieb

  17. To live with the sun - utilization of solar energy for the Talhof. Mit der Sonne leben - Solarstrom fuer den Talhof

    Energy Technology Data Exchange (ETDEWEB)

    Sauer, H.D.

    1990-06-01

    Technical progress sometimes takes place at remote places. Away from the Bundesstrasse 27 which goes from Rottweil via the Swabian Mountains to Tubingen a lovingly renovated old farmhouse is located in a romantic meadow near Schoemberg. Since the middle of last year 90% of its electricity demand is covered with solar power. The project has been presented to the public by the Fraunhofer-Institut fuer Solare Energiesysteme Freiburg at the 18.th of May. (orig.).

  18. Temporal variation of the anthropogenic CO{sub 2} and CH{sub 4} contribution in Germany and its role in the global atmospheric carbon cycle; Zeitliche Entwicklung des anthropogenen CO{sub 2}- und CH{sub 4}-Anteils in Deutschland und dessen Bedeutung fuer den globalen atmosphaerischen Kohlenstoffkreislauf

    Energy Technology Data Exchange (ETDEWEB)

    Schmidt, M.; Cuntz, M.; Kromer, B.; Levin, I.

    1999-12-01

    Bilanzierung von anthropogenenen Treibhausgasemissionen aus atmosphaerischen Messungen. An den Stationen Schauinsland und Heidelberg (Suedwestdeutschland) sowie Neuglobsow und Zingst (Nordostdeutschland) wurden die CO{sub 2}-, CH{sub 4}-, N{sub 2}O- und {sup 222}Rn-Mischungsverhaeltnisse ueber mehrere Jahre gemessen. Unter Verwendung von {sup 222}Rn als Transporttracer konnten die CH{sub 4}- und N{sub 2}O-Emissionen bilanziert werden. Innerhalb der Unsicherheiten dieser Abschaetzung sind die mittleren CH{sub 4}-Quelldichten fuer die Einzungsgebiete der vier Stationen mit (0.23{+-}0.07)g CH{sub 4} km{sup -2} s{sup -1} identisch, was auf die relativ homogene Bestandsdichte von Milchkuehen, die mit fast 60% zu den CH{sub 4}-Emissionen der jeweiligen Regionen beitragen, zurueckgefuehrt wird. Bei der Auswertung der N{sub 2}O-Datensaetze in Heidelberg konnten die Einfluesse lokaler Punktquellen (Kliniken) eliminiert werden, und es wurde eine 50 prozentige Abnahme der N{sub 2}O-Quelldichte von 1996/97 auf 1998 nachgewiesen. Diese faellt zeitlich zusammen mit einer dramatischen Reduktion der N{sub 2}O-Emissionen aus der Adipinsaeureproduktion der BASF AG Ende 1997. Eine quantitative Auswertung der CO{sub 2}-Emissionen in Heidelberg und am Schauinsland konnte durch eine Analyse der CO{sub 2}-Konzentrations- und Isotopenmessreihen unter Verwendung der Radon-Tracer-Methode erreicht werden. Die aus den atmosphaerischen {delta}{sup 14}C-Messungen fuer die Jahre 1982 bis 1998 bestimmte fossile CO{sub 2}-Quelldichte betraegt in Heidelberg im Mittel (502{+-}23) t C km{sup -2} a{sup -1} und fuer Schauinsland (274{+-}8) t C km{sup -2} a{sup -1}, sie zeigt fuer diesen Zeitraum keinen Trend. Dagegen ist die Aenderung der Zusammensetzung der eingesetzten fossilen Energietraeger (Gas, Erdoel und Kohle) in Heidelberg deutlich an der {delta}{sup 13}C-Signatur des fossilen CO{sub 2}-Anteils von (-28.6{+-}0.6) permille fuer 1982/83 auf (-38.5{+-}1) permille fuer 1995 bis 1998 zu erkennen. (orig.)

  19. Rebuilding sources of linear tracers after atmospheric concentration measurements

    Directory of Open Access Journals (Sweden)

    J.-P. Issartel

    2003-01-01

    Full Text Available The identification of widespread sources of passive tracers out of atmospheric concentration measurements has become an important challenge of modern meteorology. The paper proposes some mathematical tracks to address the reconstruction of the complex space-time geometry of the sources of linear tracers. The methods are based upon the use of retroplumes. The inverse problem is addressed in a deterministic non statistical frame. The information obtained by local measurements is spread by introducing the concept of illumination. The constraint that the source is non negative is also addressed. The experimental source ETEX1 is rebuilt in order to evaluate an impulse response of the algorithms.

  20. Preliminary assessment of halogenated alkanes as vapor-phase tracers

    Energy Technology Data Exchange (ETDEWEB)

    Adams, Michael C.; Moore, Joseph N.; Hirtz, Paul

    1991-01-01

    New tracers are needed to evaluate the efficiency of injection strategies in vapor-dominated environments. One group of compounds that seems to meet the requirements for vapor-phase tracing are the halogenated alkanes (HCFCs). HCFCs are generally nontoxic, and extrapolation of tabulated thermodynamic data indicate that they will be thermally stable and nonreactive in a geothermal environment. The solubilities and stabilities of these compounds, which form several homologous series, vary according to the substituent ratios of fluorine, chlorine, and hydrogen. Laboratory and field tests that will further define the suitability of HCFCs as vapor-phase tracers are under way.

  1. Streamwise decrease of the 'unsteady' virtual velocity of gravel tracers

    Science.gov (United States)

    Klösch, Mario; Gmeiner, Philipp; Habersack, Helmut

    2017-04-01

    Gravel tracers are usually inserted and transported on top of the riverbed, before they disperse vertically and laterally due to periods of intense bedload, the passage of bed forms, lateral channel migration and storage on bars. Buried grains have a lower probability of entrainment, resulting in a reduction of overall mobility, and, on average, in a deceleration of the particles with distance downstream. As a consequence, the results derived from tracer experiments and their significance for gravel transport may depend on the time scale of the investigation period, complicating the comparison of results from different experiments. We developed a regression method, which establishes a direct link between the transport velocity and the unsteady flow variables to yield an 'unsteady' virtual velocity, while considering the tracer slowdown with distance downstream in the regression. For that purpose, the two parameters of a linear excess shear velocity formula (the critical shear velocity u*c and coefficient a) were defined as functions of the travelled distance since the tracer's insertion. Application to published RFID tracer data from the Mameyes River, Puerto Rico, showed that during the investigation period the critical shear velocity u*c of tracers representing the median bed particle diameter (0.11 m) increased from 0.36 m s-1 to 0.44 m s-1, while the coefficient a decreased from the dimensionless value of 4.22 to 3.53, suggesting a reduction of the unsteady virtual velocity at the highest shear velocity in the investigation period from 0.40 m s-1 to 0.08 m s-1. Consideration of the tracer slowdown improved the root mean square error of the calculated mean displacements of the median bed particle diameter from 8.82 m to 0.34 m. As in previous work these results suggest the need of considering the history of transport when deriving travel distances and travel velocities, depending on the aim of the tracer study. The introduced method now allows estimating the

  2. Observation of individual tracer atoms in an ultracold dilute gas

    CERN Document Server

    Hohmann, Michael; Lausch, Tobias; Mayer, Daniel; Schmidt, Felix; Lutz, Eric; Widera, Artur

    2016-01-01

    Understanding the motion of a tracer particle in a rarefied gas is of fundamental and practical importance. We report the experimental investigation of individual Cs atoms impinging on a dilute cloud of ultracold Rb atoms with variable density. We study the nonequilibrium relaxation of the initial nonthermal state and detect the effect of single collisions which has eluded observation so far. We show that after few collisions, the measured spatial distribution of the light tracer atoms is correctly described by a generalized Langevin equation with a velocity-dependent friction coefficient, over a large range of Knudsen numbers.

  3. Tracer Cycles and Water Ages in Heterogeneous Catchments and Aquifers

    Science.gov (United States)

    Kirchner, J. W.; Jasechko, S.

    2015-12-01

    Estimates of catchment mean transit times are often based on seasonal cycles of stable isotope tracers in precipitation and streamflow. In many cases these transit time estimates are derived directly from sine-wave fitting to the observed seasonal isotope cycles. Broadly similar results are also obtained from time-domain convolutions or explicit tracer modeling, because here too the dominant tracer signal that these techniques seek to match is the seasonal isotopic cycle. Here I use simple benchmark tests to show that estimates of mean transit times based on seasonal tracer cycles will typically be wrong by several hundred percent, when applied to catchments with realistic degrees of spatial heterogeneity. This aggregation bias arises from the strong nonlinearity in the relationship between tracer cycle amplitude and mean travel time. A similar bias arises in estimates of mean transit times in nonstationary catchments. Since typical real-world catchments are both spatially heterogeneous and nonstationary, this analysis poses a fundamental challenge to tracer-based estimates of mean transit times. I propose an alternative storage metric, the fraction of "young water" in streamflow, defined as the fraction of runoff with transit times of less than roughly 0.2 years. I show that young water fractions are virtually free of aggregation bias; that is, they can be accurately estimated from tracer cycles in highly heterogeneous mixtures of subcatchments with strongly contrasting transit time distributions. They can also be reliably estimated in strongly nonstationary catchments. Young water fractions can be estimated separately for individual flow regimes, allowing direct determination of how shifts in hydraulic regime alter the fraction of water reaching the stream by fast flowpaths. One can also estimate the chemical composition of idealized "young water" and "old water" end-members, using relationships between young water fractions and solute concentrations across

  4. North Atlantic ventilation using chlorofluorocarbons and idealised-tracer simulations

    Directory of Open Access Journals (Sweden)

    Yan-Chun He

    2012-10-01

    Full Text Available The simulated chlorofluorocarbon CFC-11 and 29 geographically defined CFC-11 tracers, as well as 29 geographically defined idealised tracers, are used to quantify the regional contribution to the ventilation of the North Atlantic Ocean in a global version of the Miami Isopycnal Coordinate Ocean Model (MICOM driven by the daily NCEP/NCAR forcing. Age tracers attached to 29 idealised tracers are also used to estimate the timescales for the water masses’ transports. Our results show that the simulated overturning circulation matches the available observed data for both intensity and variability, and the simulated distribution of CFC-11 concentration in the subtropical North Atlantic Ocean is in good agreement with the observations, particularly above 800 m in depth. We found that the sandwich-like distribution of CFC-11 concentration in the subtropical North Atlantic in both the observations and simulations is mainly caused by subduction from the western and eastern subpolar North Atlantic, but the contribution of the former (56.0% is almost four times larger than that of the latter (15.7%. We demonstrated that the ocean dynamics, instead of the source function, determine the annual and inter-annual variability in both dynamically active tracer (such as water temperature and salinity and passive tracer (such as CFC-11 and idealised tracer concentrations in the deep North Atlantic. The ‘apparent age’ distribution shows that the surface water in the western subpolar North Atlantic takes about 12 yr to reach the Nordic Seas and takes 20 yr from the Nordic Seas to the subtropical deep North Atlantic. The transit-time derived by ‘optimum time lag’ approach shows a 9.3–13.6 yr lag for the signals propagating from the western subpolar North Atlantic to the subtropical North Atlantic, which is generally consistent with that of about 10 yr derived from the ‘apparent age’. The study suggests that geographically defined tracers can be used as

  5. Measurement of Kr-85 and Xe-133 as undisturbed tracers for the representing of atmospheric transport after disposal of radioactivity from nuclear facilities; Messungen von Kr-85 und Xe-133 als ungestoerte Tracer zur Darstellung atmosphaerischer Transportvorgaenge nach Freisetzung von Radioaktivitaet aus kerntechnischen Anlagen

    Energy Technology Data Exchange (ETDEWEB)

    Frank, G.; Steinkopff, T. [Deutscher Wetterdienst (Germany); Salvamoser, J. [Institut fuer Angewandte Isotopen-, Gas- und Umweltuntersuchungen (IGU), Woerthsee (Germany)

    2016-07-01

    The Deutscher Wetterdienst (DWD, German Meteorological Service) operates since 1996 a sampling and measurement device for the radioactive rare gases Kr-85 and Xe-133 in Offenbach. These measurements are embedded in the German Measurement and Information System for Monitoring Environmental Radioactivity (Integriertes Mess- und Informationssystem zur Ueberwachung der Radioaktivitaet in der Umwelt, IMIS) [1]. In addition to these measurements the DWD is sampling rare gases in Potsdam and since 2014 in Trier in cooperation with the Bundesamt fuer Strahlenschutz (Federal Office for Radiation Protection, BfS). In the frame of the Global Atmosphere Watch (GAW)-program of the WMO the DWD operated a sampling station at the Zugspitze (Schneefernerhaus) from 1999 to 2005. This location at the Zugspitze is well suited for the observation of long distance transport of Kr-85 in the higher atmosphere. The DWD in Offenbach operates a complex analytical system for the measurement of Kr-85 and Xe-133 since 1998. This system consists of sampling with first enrichment, second enrichment, gas chromatographic separation and preparation of Krypton and Xenon and measurement of Kr-85 and Xe-133. Using the example Fukushima, it is shown, that the radioactive rare gases Kr-85 and Xe-133 are well undisturbed tracers for atmospheric transport in case of a nuclear accident or routine nuclear reprocessing plants. Measurements of Xe-133, I-131, Cs-137 and Kr-85 are correlated with source and atmospheric transport to the sampling sites at Offenbach and Potsdam.

  6. Technical boundary conditions of network access in the natural gas sector; Technische Rahmenbedingungen fuer den Netzzugang bei Erdgas

    Energy Technology Data Exchange (ETDEWEB)

    Huegging, T.; Peper, F.; Wernekinck, U. [RWE Gas AG, Dortmund (Germany)

    2001-11-01

    Due to the current liberalization process the European gas business is changing rapidly. Many new problems that arise will have to be solved by practical solutions. Especially the German gas business with its very heterogeneous structure is already facing a lot of difficulties, which may also become apparent on a European level with further liberalization progress. An example is the handling of transportation for household customers on the basis of load profiles. The second amendment of the German gas association agreement encompasses technical guidelines for network access, which encompass solutions for some of the arising problems. It becomes evident that the technical guidelines are equivalent to a functional standard for third party access in the German gas market. (orig.) [German] Die europaeische Gaswirtschaft befindet sich, verursacht durch die Liberalisierung der Energiemaerkte, in einer rasanten Umbruchphase. Fuer viele neue Probleme muessen angemessene Loesungen gefunden werden; die deutsche Gaswirtschaft sieht sich wegen ihrer mehrstufigen Struktur bereits auf natioanler Ebene mit vielen Fragestellungen konfrontiert, die sich in naechster Zeit auch auf internationaler Ebene einstellen werden. Ein Beispiel hierfuer ist die Abwicklung von Gastransporten zur Belieferung nicht leistungsgemessener Kunden mittels Lastprofilen. Im Rahmen des zweiten Nachtrags zur VV Gas sind technische Rahmenbedingungen fuer den Netzzugang abgestimmt, die fuer einige dieser Probleme Loesungen darstellen. Dabei wird deutlich, dass die Regelung den Charakter einer Funktionalnorm zum Netzzugang hat. (orig.)

  7. Fluid mechanics for mechanical engineering. Technology and examples. 2. ed.; Stroemungslehre fuer den Maschinenbau. Technik und Beispiele

    Energy Technology Data Exchange (ETDEWEB)

    Siekmann, Helmut E.; Thamsen, Paul Uwe [Technische Univ. Berlin (Germany). Fluidsystemtechnik - Stroemungstechnik in Maschinen und Anlagen

    2009-07-01

    Detailed information on turbomachinery; Practical examples as learning aids; Compact presentation with good text and picture quality; Ideal for self-studies and for university teaching. This practically oriented information on the fundamentals of fluid mechanics addresses engineers and students of the engineering sciences, physics, and application-oriented mathematics. The many practical examples are useful for producers and users of the fluid mechanics industry. The text is structured in the same manner as in the 'Grundlagen' volume: Hydrostatics, kinematics, momentum law, Navier-Stokes equation of motion, potential flow, eddy flow, boundary layer flow, turbulent flow. The book closes with information on tube flow, flow around bodies, similarity laws, and numeric flow calculation. This the second, revised and edited edition. (orig.) [German] - Fuer gruendliche Kenntnisse von Stroemungsmaschinen - Praxisbeispiele als Lernhilfen - Kompakte Darstellung in hoher Text- und Bildqualitaet - Ideal zum Selbststudium und fuer die Vorlesung Diese anwendungsbezogene Vertiefung der Themen aus den Grundlagen der Stroemunglehre wendet sich an Ingenieure und Studenten der Ingenieurwissenschaften, Physik und anwendungsorientierten Mathematik. Die zahlreichen Praxisbeispiele sind hilfreich fuer Hersteller und Anwender aus vorwiegend stroemungstechnischer Industrie. Die Einteilung der Kapitel entspricht im Wesentlichen der im Band Grundlagen: Hydrostatik, Kinematik, Impulssatz, NAVIER-STOKES-Bewegungsgleichung, Potential-, Wirbel- und Grenzschichtstroemung sowie turbulente Stroemung. Das Buch schliesst mit Darstellungen ueber Rohrstroemungen, Umstroemung von Koerpern, Aehnlichkeitsgesetzen und numerische Stroemungsberechnung. Die 2. Auflage wurde aktualisiert und korrigiert. (orig.)

  8. Concepts for `superior process control` in the energy industry; Konzepte fuer die uebergeordnete Prozessfuehrung in der Energiewirtschaft

    Energy Technology Data Exchange (ETDEWEB)

    Doellen, U.C. von

    1996-12-01

    The work concerns the task of control described as dispatching of extensive energy supply and distribution networks. Due to the special contractual situation, there are special long-term targets in firms, which must be achieved in addition to the extensive operational tasks of control and monitoring of the networks. The concepts introduced in the work offer a framework for a target-orientated design of computer-aided menus for this superior process control in the energy industry. (orig./GL) [Deutsch] Die Arbeit betrachtet die als Dispatching bezeichnete Aufgabe der Fuehrung ausgedehnter Energieversorgungs- und verteilungsnetze. Aus den speziellen Vertragssituationen ergeben sich in den Unternehmen besondere, langfristige Zielvorgaben an die mit der Betriebsfuehrung beauftragen Operateure, die zusaetzlich zu den umfangreichen operativen Aufgaben der Fuehrung und Ueberwachung der Netze zu erreichen sind. Die in der Arbeit vorgestellten Konzepte bieten den Rahmen fuer einen zielgerichteten Entwurf rechnergestuetzter Hilfsmittel fuer diese uebergeordnete Prozessfuehrung in der Energiewirtschaft. Das erstellte Gesamtsystem wird abschliessend zur Loesung einer konkreten, energiewirtschaftlichen Problemstellung eingesetzt. Die entwickelte Anwendungsloesung wird als Hilfsmittel fuer die technische und vertragliche Optimierung im Dispatching eingesetzt. Wesentliche Zielsetzung ist ein technisch und wirtschaftlich optimaler Einsatz von Energiespeichern zur Deckung von Spitzenlasten. (orig./GL)

  9. Experiments to Evaluate and Implement Passive Tracer Gas Methods to Measure Ventilation Rates in Homes

    Energy Technology Data Exchange (ETDEWEB)

    Lunden, Melissa [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Faulkner, David [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Heredia, Elizabeth [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Cohn, Sebastian [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Dickerhoff, Darryl [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Noris, Federico [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Logue, Jennifer [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Hotchi, Toshifumi [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Singer, Brett [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Sherman, Max H. [Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

    2012-10-01

    This report documents experiments performed in three homes to assess the methodology used to determine air exchange rates using passive tracer techniques. The experiments used four different tracer gases emitted simultaneously but implemented with different spatial coverage in the home. Two different tracer gas sampling methods were used. The results characterize the factors of the execution and analysis of the passive tracer technique that affect the uncertainty in the calculated air exchange rates. These factors include uncertainties in tracer gas emission rates, differences in measured concentrations for different tracer gases, temporal and spatial variability of the concentrations, the comparison between different gas sampling methods, and the effect of different ventilation conditions.

  10. Feasibility study for new ecolabels according to ISO 14024 (type I) within the product group: small cogeneration plants; Machbarkeitsstudie fuer neue Umweltzeichen in Anlehnung an ISO 14024 (Type I) fuer die Produktgruppe: Kleine Blockheizkraftwerk-Module

    Energy Technology Data Exchange (ETDEWEB)

    Hoffmann, E.; Hirschl, B.; Kaliske, J. [Institut fuer Oekologische Wirtschaftsforschung (IOEW) gGmbH, Berlin (Germany); Reese, I.; Grimpe, T. [Hamburg Gas Consult (HGC) GmbH (Germany)

    2000-11-02

    available data, it is not possible at the moment to derive concrete criteria for an ecolabel in this field. After the introduction of initial products onto the market, corresponding requirements for plants based on this new technology should be specified. (orig.) [German] Beim vorliegenden Gutachten handelt es sich um eine Machbarkeitsstudie nach ISO 14024. Es behandelt die Frage, ob ein Umweltzeichen fuer kleine BHKW-Module gerechtfertigt ist, und welche Anforderungen diese im Vergabefall erfuellen sollten. Im Rahmen der Untersuchung wurde zunaechst eine umfassende Marktanalyse durchgefuehrt, um daraus die Anlagen zu identifizieren, die fuer ein Umweltzeichen in Frage kommen. Im Hauptteil der Studie ging es um die vertiefende Analyse der Umweltrelevanz der ausgewaehlten Anlagen. Hierzu wurde eine Herstellerbefragung durchgefuehrt und ausgeaehlte BHKW anhand eines Systemvergleiches mit Gas- und Oelheizkesseln verglichen. Auf der Basis dieser Analyse wurden Anforderungskataloge fuer Gas- und Diesel-BHKW-Module abgeleitet, die in einem Fachgespraech in einer breiten Runde von Experten und Herstellern vorgestellt und diskutiert wurden. Aus der Studie und dem Fachgespraech konnte ein deutliches Votum fuer ein Umweltzeichen fuer die untersuchten BHWK-Module abgeleitet werden. Die vorgeschlagenen Vergabegrundlagen umfassen Anforderungen an Richtlinienkonformitaet, rationelle Energienutzung (Elektrischer und Gesamtwirkungsgrad bei Nennlast und Teillast, Angabe des Hilfsstrombedarfes), Emissionswerte von CO, NO{sub x}, Staub und organischen Stoffen, Schallemissionen, Angebot von Wartungsvertraegen, Ruecknahmeverpflichtung sowie Anforderungen an die Bedienungsanleitung. Als moegliche Umschrift eines Zeichens fuer kleine BHKW-Module wird empfohlen: 'Umweltzeichen... weil energieefizient'. Neben motorischen BHKW wurden auch kleine Brennstoffzellen-BHKW untersucht. Diese befinden sich zur Zeit noch in einer Feldtest- und Erprobungsphase. Sie weisen deutliche oekologische

  11. Innovative methods to use silicon sheets for high efficiency solar cells. Final report; Innovative Verfahren zum Einsatz von Siliciumfolien fuer hocheffiziente Solarzellen. Schlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Schmidt, W.

    2001-01-01

    This project was organised into three main activity units. The design and test of continuous process equipment and related handling and control systems for multicrystalline and EFG (edge-defined film-fed growth) silicon wafers lead to an important knowledge base for the design of a fully automated (pilot) production line for high efficiency solar cells, specially suited for the application of silicon sheets with their different surface morphology in comparison to conventional sliced silicon wafers. The development of new continuous processing equipment closed the gaps in the design concept of an automated production line to realise a simple process sequence and related innovative continuous processing schemes for the production of high efficiency solar cells from silicon sheets. Based on the results achieved so far, a fully automated pilot production line with continuous processing equipment for all process steps for the production of high efficiency solar cells was set up. The test results demonstrated the suitability of the selected concept for a future mass production in the 50 to 100 MW range: Mean cell efficiencies of 14% for EFG sheets and 14.5-15% for cast multicrystalline silicon wafers were achieved. A thorough cell production cost analysis based on all collected data revealed a 20% reduction in comparison to the former state-of-the-art. (orig.) [German] In diesem Vorhaben wurden drei Arbeitsschwerpunkte bearbeitet. Die Konzeption und Erprobung von Durchlaufanlagen und zugehoerigen Handhabungs- und Steuerungssystemen fuer mc(multikristalline)- und EFG(edge-defined film-fed growth)-Siliciumscheiben lieferte wesentliche Erkenntnisse fuer die Gestaltung einer vollautomatischen Pilotfertigung fuer hocheffiziente Solarzellen, speziell geeignet fuer den Einsatz von Siliciumfolien mit ihrer gegenueber konventionellen gesaegten Siliciumscheiben andersartigen Oberflaechenstruktur. Die Entwicklung neuartiger Durchlaufanlagen schloss die bestehenden Luecken im

  12. TRAC, a collaborative computer tool for tracer-test interpretation

    Science.gov (United States)

    Gutierrez, A.; Klinka, T.; Thiéry, D.; Buscarlet, E.; Binet, S.; Jozja, N.; Défarge, C.; Leclerc, B.; Fécamp, C.; Ahumada, Y.; Elsass, J.

    2013-05-01

    Artificial tracer tests are widely used by consulting engineers for demonstrating water circulation, proving the existence of leakage, or estimating groundwater velocity. However, the interpretation of such tests is often very basic, with the result that decision makers and professionals commonly face unreliable results through hasty and empirical interpretation. There is thus an increasing need for a reliable interpretation tool, compatible with the latest operating systems and available in several languages. BRGM, the French Geological Survey, has developed a project together with hydrogeologists from various other organizations to build software assembling several analytical solutions in order to comply with various field contexts. This computer program, called TRAC, is very light and simple, allowing the user to add his own analytical solution if the formula is not yet included. It aims at collaborative improvement by sharing the tool and the solutions. TRAC can be used for interpreting data recovered from a tracer test as well as for simulating the transport of a tracer in the saturated zone (for the time being). Calibration of a site operation is based on considering the hydrodynamic and hydrodispersive features of groundwater flow as well as the amount, nature and injection mode of the artificial tracer. The software is available in French, English and Spanish, and the latest version can be downloaded from the web site http://trac.brgm.fr">http://trac.brgm.fr.

  13. Correlative microscopy of densely labeled projection neurons using neural tracers.

    Science.gov (United States)

    Oberti, Daniele; Kirschmann, Moritz A; Hahnloser, Richard H R

    2010-01-01

    Three-dimensional morphological information about neural microcircuits is of high interest in neuroscience, but acquiring this information remains challenging. A promising new correlative technique for brain imaging is array tomography (Micheva and Smith, 2007), in which series of ultrathin brain sections are treated with fluorescent antibodies against neurotransmitters and synaptic proteins. Treated sections are repeatedly imaged in the fluorescence light microscope (FLM) and then in the electron microscope (EM). We explore a similar correlative imaging technique in which we differentially label distinct populations of projection neurons, the key routers of electrical signals in the brain. In songbirds, projection neurons can easily be labeled using neural tracers, because the vocal control areas are segregated into separate nuclei. We inject tracers into areas afferent and efferent to the main premotor area for vocal production, HVC, to retrogradely and anterogradely label different classes of projection neurons. We optimize tissue preparation protocols to achieve high fluorescence contrast in the FLM and good ultrastructure in the EM (using osmium tetroxide). Although tracer fluorescence is lost during EM preparation, we localize the tracer molecules after fixation and embedding by using fluorescent antibodies against them. We detect signals mainly in somata and dendrites, allowing us to classify synapses within a single ultrathin section as belonging to a particular type of projection neuron. The use of our method will be to provide statistical information about connectivity among different neuron classes, and to elucidate how signals in the brain are processed and routed among different areas.

  14. Correlative microscopy of densely labeled projection neurons using neural tracers

    Directory of Open Access Journals (Sweden)

    Daniele Oberti

    2010-06-01

    Full Text Available Three-dimensional morphological information about neural microcircuits is of high interest in neuroscience, but acquiring this information remains challenging. A promising new correlative technique for brain imaging is array tomography (Micheva and Smith, 2007, in which series of ultrathin brain sections are treated with fluorescent antibodies against neurotransmitters and synaptic proteins. Treated sections are repeatedly imaged in the fluorescence light microscope (FLM and then in the electron microscope (EM. We explore a similar correlative imaging technique in which we differentially label distinct populations of projection neurons, the key routers of electrical signals in the brain. In songbirds, projection neurons can easily be labeled using neural tracers, because the vocal control areas are segregated into separate nuclei. We inject tracers into areas afferent and efferent to the main premotor area for vocal production, HVC, to retrogradely and anterogradely label different classes of projection neurons. We optimize tissue preparation protocols to achieve high fluorescence contrast in the FLM and good ultrastructure in the EM (using osmium tetroxide. Although tracer fluorescence is lost during EM preparation, we localize the tracer molecules after fixation and embedding by using fluorescent antibodies against them. We detect signals mainly in somata and dendrites, allowing us to classify synapses within a single ultrathin section as belonging to a particular type of projection neuron. The use of our method will be to provide statistical information about connectivity among different neuron classes, and to elucidate how signals in the brain are processed and routed among different areas.

  15. Tracer Modeling with the Hybrid Coordinates Ocean Model (hycom)

    Science.gov (United States)

    Garraffo, Z. D.; Kim, H.; Li, B.; Mehra, A.; Rivin, I.; Spindler, T.; Tolman, H. L.

    2012-12-01

    A series of tracer simulations have been started at NCEP/NWS aiming to a variety of applications, from dispersion of contaminants in estimations motivated by the Japanese nuclear accident near Fukushima, to nutrient estimations. The tracer capabilities of HYCOM are used, in regional domains, nested to daily nowcast/forecast fields from 1/12 HYCOM (RTOFS-Global) model output. A Fukushima Cs-137 simulation is now run in operational mode (RTOFS_ET). The simulation was initialized at the time of the Fukushima nuclear accident, and includes atmospheric deposition of Cs-137 and coastal discharge from a high resolution coastal model (ROMS done at NOAA/NOS). Almost all tracer moved offshore before the end of the first year after the accident. The tracer initially deposited in the Pacific ocean through the atmosphere slowly moves eastward and to deeper waters following the 3D ocean circulation. A series of simulations were started for nutrient estimations in the Gulf Stream and Mid Atlantic Bight region. Initially the capabilities implemented in HYCOM are used. The work aims to monitoring nutrients in the chosen region. Work is done in collaboration with Victoria Coles of U. Maryland.

  16. Tracer Studies In A Laboratory Beach Subjected To Waves

    Science.gov (United States)

    This work investigated the washout of dissolved nutrients from beaches due to waves by conducting tracer studies in a laboratory beach facility. The effects of waves were studied in the case where the beach was subjected to the tide, and that in which no tidal action was present...

  17. Microfluidics: A Groundbreaking Technology for PET Tracer Production?

    Directory of Open Access Journals (Sweden)

    Björn Wängler

    2013-07-01

    Full Text Available Application of microfluidics to Positron Emission Tomography (PET tracer synthesis has attracted increasing interest within the last decade. The technical advantages of microfluidics, in particular the high surface to volume ratio and resulting fast thermal heating and cooling rates of reagents can lead to reduced reaction times, increased synthesis yields and reduced by-products. In addition automated reaction optimization, reduced consumption of expensive reagents and a path towards a reduced system footprint have been successfully demonstrated. The processing of radioactivity levels required for routine production, use of microfluidic-produced PET tracer doses in preclinical and clinical imaging as well as feasibility studies on autoradiolytic decomposition have all given promising results. However, the number of microfluidic synthesizers utilized for commercial routine production of PET tracers is very limited. This study reviews the state of the art in microfluidic PET tracer synthesis, highlighting critical design aspects, strengths, weaknesses and presenting several characteristics of the diverse PET market space which are thought to have a significant impact on research, development and engineering of microfluidic devices in this field. Furthermore, the topics of batch- and single-dose production, cyclotron to quality control integration as well as centralized versus de-centralized market distribution models are addressed.

  18. Tracer Studies In A Laboratory Beach Subjected To Waves

    Science.gov (United States)

    This work investigated the washout of dissolved nutrients from beaches due to waves by conducting tracer studies in a laboratory beach facility. The effects of waves were studied in the case where the beach was subjected to the tide, and that in which no tidal action was present...

  19. 76 FR 71610 - Market Test of First-Class Tracer

    Science.gov (United States)

    2011-11-18

    ... research and development costs incurred in connection with new product development. Id. Statutory authority... product, First- Class Tracer. This document describes the proposed test, addresses procedural aspects of... a market test beginning on or about December 7, 2011, of an experimental market dominant...

  20. Granulation of Pyrotechnic Tracer Composition R284T

    Science.gov (United States)

    1988-03-01

    Properties of Materials used in Pyrotechnic Compositions (1963). Engineering Design Handbook - Military Pyrotechnic Series Part 3. AMPC 706-187. 4...Ml Cartridge AMPC 706-185 APPLICATION: Main Tracer Charge TM9-1910 Ellern STORAGE: NATO DoD McIntyre Hazards Class (Q/D 1.1 7 Cabbaje & Ewing

  1. Carbon monoxide : A quantitative tracer for fossil fuel CO2?

    NARCIS (Netherlands)

    Gamnitzer, Ulrike; Karstens, Ute; Kromer, Bernd; Neubert, Rolf E. M.; Meijer, Harro A. J.; Schroeder, Hartwig; Levin, Ingeborg

    2006-01-01

    Carbon monoxide (CO), carbon dioxide (CO2), and radiocarbon ((CO2)-C-14) measurements have been made in Heidelberg from 2001 to 2004 in order to determine the regional fossil fuel CO2 component and to investigate the application of CO as a quantitative tracer for fossil fuel CO2 (CO2(foss)). The obs

  2. Diagnostic Implications of the Reactivity of Fluorescence Tracers

    Energy Technology Data Exchange (ETDEWEB)

    Sick, V; Westbrook, C

    2008-07-14

    Measurements of fuel concentration distributions with planar laser induced fluorescence of tracer molecules that are added to a base fuel are commonly used in combustion research and development. It usually is assumed that the tracer concentration follows the parent fuel concentration if physical properties such as those determining evaporation are matched. As an example to address this general issue a computational study of combustion of biacetyl/iso-octane mixtures was performed to investigate how well the concentration of biacetyl represents the concentration of iso-octane. For premixed mixture conditions with flame propagation the spatial concentration profiles of the two species in the flame front are separated by 110 {micro}m at 1 bar and by 11 {micro}m at 10 bar. For practical applications this spatial separation is insignificantly small. However, for conditions that mimic ignition and combustion in diesel and HCCI-like operation the differences in tracer and fuel concentration can be significant, exceeding hundreds of percent. At low initial temperature biacetyl was found to be more stable whereas at higher temperature (>1000K) iso-octane is more stable. Similar findings were obtained for a multi-component fuel comprised of iso-octane, n-heptane, methylcyclohexane, and toluene. It may be assumed that similar differences can exist for other tracer/fuel combinations. Caution has therefore to be applied when interpreting PLIF measurements in homogeneous reaction conditions such as in HCCI engine studies.

  3. Unit vent airflow measurements using a tracer gas technique

    Energy Technology Data Exchange (ETDEWEB)

    Adams, D.G. [Union Electric Company, Fulton, MO (United States); Lagus, P.L. [Lagus Applied Technology, Inc., San Diego, CA (United States); Fleming, K.M. [NCS Corp., Columbus, OH (United States)

    1997-08-01

    An alternative method for assessing flowrates that does not depend on point measurements of air flow velocity is the constant tracer injection technique. In this method one injects a tracer gas at a constant rate into a duct and measures the resulting concentration downstream of the injection point. A simple equation derived from the conservation of mass allows calculation of the flowrate at the point of injection. Flowrate data obtained using both a pitot tube and a flow measuring station were compared with tracer gas flowrate measurements in the unit vent duct at the Callaway Nuclear Station during late 1995 and early 1996. These data are presented and discussed with an eye toward obtaining precise flowrate data for release rate calculations. The advantages and disadvantages of the technique are also described. In those test situations for which many flowrate combinations are required, or in large area ducts, a tracer flowrate determination requires fewer man-hours than does a conventional traverse-based technique and does not require knowledge of the duct area. 6 refs., 10 figs., 6 tabs.

  4. Bridging the gaps in 18F PET tracer development

    Science.gov (United States)

    Campbell, Michael G.; Mercier, Joel; Genicot, Christophe; Gouverneur, Véronique; Hooker, Jacob M.; Ritter, Tobias

    2017-01-01

    As compared to the drug discovery process, the development of new 18F PET tracers lacks a well-established pipeline that advances compounds from academic research to candidacy for (pre)clinical imaging. In order to bridge the gaps between methodological advances and clinical success, we must rethink the development process from training to implementation.

  5. Uptake and transport of positron-emitting tracer in plants

    Energy Technology Data Exchange (ETDEWEB)

    Kume, Tamikazu; Matsuhashi, Shinpei; Shimazu, Masamitsu [Japan Atomic Energy Research Inst., Takasaki, Gunma (Japan). Takasaki Radiation Chemistry Research Establishment] [and others

    1997-03-01

    The transport of a positron-emitting isotope introduced into a plant was dynamically followed by a special observation apparatus called `Positron-Emitting Tracer Imaging System`. In the system, annihilation {gamma}-rays from the positron emitter are detected with two planer detectors (5 x 6 cm square). The water containing ca. 5 MBq/ml of {sup 18}F was fed to the cut stem of soybean for 2 min and then the images of tracer activity were recorded for 30 - 50 min. When the midrib of a leaf near the petiole was cut just before measurement, the activity in the injured leaf was decreased but detected even at the apex. This result suggests that the damaged leaf recovered the uptake of water through the lamina. Maximum tracer activities in leaves of unirradiated plant were observed within 10 min, whereas those of irradiated plant at 100 Gy were observed after over 25 min. The final activity of irradiated plant after 30 min was lower than that of unirradiated plant. In case of beans, there was a difference in the absorption behavior of the {sup 18}F-labeled water between unirradiated and irradiated samples. These results show that the system is effective to observe the uptake and transportation of water containing positron emitting tracer for the study of damage and recovery functions of plants. (author)

  6. Performance improvement in self-powered and cable-driven overhead monorails (higher speed and higher useful load); Moeglichkeiten der Leistungssteigerung fuer eigenangetriebene und seilbetriebene Einschienenhaengebahnen (Fahrgeschwindigkeits- bzw. Nutzlasterhoehung)

    Energy Technology Data Exchange (ETDEWEB)

    Bolz, P. [Deutsche Montan Technologie GmbH, Bochum (Germany). Car Synergies Division

    2002-07-01

    The project investigated the safety aspects of higher speed and higher useful load in overhead monorails and developed concepts for constructional measures which were tested in trial applications. The primary focus was on higher speed. In the case of cable systems, also the increase of the tractive strength of the cable was investigated. [German] Im Rahmen des Vorhabens wurden fuer eigenangetriebene und seilbetriebene Einschienenhaengebahnen (EHB) die sicherheitlichen Voraussetzungen fuer eine Steigerung der Fahrgeschwindigkeit bzw. der Nutzlast erarbeitet. Daraus resultierend entstanden Konzepte fuer konstruktive Massnahmen, die nach einer entsprechenden Umsetzung in Prueffelduntersuchungen und untertaegigen Probeeinsaetzen getestet wurden. Die Leistungssteigerung fuer eigenangetriebene Fahrzeuge wurde primaer vor dem Hintergrund hoeherer Fahrgeschwindigkeiten ermittelt. Fuer seilbetriebene Anlagen wurde darueber hinaus der Aspekt einer Steigerung der Haspelnennzugkraft betrachtet. (orig.)

  7. Assessment of Halon-1301 as a groundwater age tracer

    Science.gov (United States)

    Beyer, M.; van der Raaij, R.; Morgenstern, U.; Jackson, B.

    2015-06-01

    Groundwater dating is an important tool to assess groundwater resources in regards to their dynamics, i.e. direction and timescale of groundwater flow and recharge, contamination risks and manage remediation. To infer groundwater age information, a combination of different environmental tracers, such as tritium and SF6, are commonly used. However, ambiguous age interpretations are often faced, due to a limited set of available tracers and their individual restricted application ranges. For more robust groundwater dating multiple tracers need to be applied complementarily (or other characterisation methods need to be used to complement tracer information). It is important that additional, groundwater age tracers are found to ensure robust groundwater dating in future. We have recently suggested that Halon-1301, a water soluble and entirely anthropogenic gaseous substance, may be a promising candidate, but its behaviour in water and suitability as a groundwater age tracer had not yet been assessed in detail. In this study, we determined Halon-1301 and inferred age information in 17 New Zealand groundwater samples and various modern (river) water samples. The samples were simultaneously analysed for Halon-1301 and SF6, which allowed for identification of issues such as contamination of the water with modern air during sampling. All analysed groundwater sites had also been previously dated with tritium, CFC-12, CFC-11 and SF6, and exhibited mean residence times ranging from modern (close to 0 years) to over 100 years. The investigated groundwater samples ranged from oxic to highly anoxic. All samples with available CFC data were degraded and/or contaminated in one or both of CFC-11 and CFC-12. This allowed us to make a first attempt of assessing the conservativeness of Halon-1301 in water, in terms of presence of local sources and its sensitivity towards degradation, which could affect the suitability of Halon-1301 as groundwater age tracer. Overall we found Halon-1301

  8. Synthesis and characterization of environmentally friendly fluorescent particle tracers

    Science.gov (United States)

    Tauro, Flavia; Porfiri, Maurizio; Rapiti, Emiliano; Grimaldi, Salvatore

    2013-04-01

    Tracers are widely used in experimental fluid mechanics and hydrology to investigate complex flows and water cycle processes. Commonly used tracers include dyes, artificial tracers, naturally occurring isotopes and chemicals, microorganisms, and DNA-based systems. Tracers should be characterized by low detection limits and high accuracy in following water paths and flow structures. For natural studies, tracers are also expected to be nontoxic and with low sorption affinity to natural substrates to minimize losses in the environment. In this context, while isotopes are completely natural, their use in field studies is limited by their ubiquity and, therefore, by the high uncertainty in data processing methodologies. Further, the use of dyes and artificial tracers can be hampered by extremely low detection limits due to dilution in natural streams and microorganisms, while DNA-based system may require physical sampling and time-consuming functionalization and detection procedures. In this work, we present the synthesis and characterization of fluorescent beads incorporating an eco-compatible fluorophore for environmental and laboratory applications. The particles are synthesized from natural beeswax through an inexpensive thermal procedure and can be engineered to present variable densities and diameters. A thorough characterization of their surface morphology at the nanoscale, crystal structure and size, chemical composition, and dye incorporation into the beeswax matrix is described by using a wide array of microscopy techniques. In addition, the particle fluorescence response is studied by performing excitation and emission scans on melted beeswax bead samples. The feasibility of using the synthesized particles in environmental settings is assessed through the design of ad-hoc weathering agent experiments where the beads are exposed to high energy radiation and hot water. Further, a proof of concept test is described to understand the particles' potential as a

  9. The determination of mass of metabolites with tracers

    Energy Technology Data Exchange (ETDEWEB)

    Katz, J. (Cedars-Sinai Medical Center, Los Angeles, CA (USA))

    1989-08-01

    Application of tracers in vivo for the determination of replacement and mass of bloodborne compounds at steady state is discussed. Theory and methods to determine mass with tracers (total amount of compound-tracee-within the body) for compartmental and noncompartmental systems are presented, and their limitations examined. Methods to derive mass from the specific activity curves after bolus injection or infusion of tracer are described using graphic procedures or by equations using the parameters of exponential curves. The relationship between assumed models and the interpretation of tracer data is examined. The determination of both replacement (appearance, which equals utilization at steady state) and mass of most compounds present in both extracellular and intracellular fluids (such as lactate and amino acids) requires the application of the A-V mode for tracer administration and sampling of blood. Recycling of carbon affects the determination of mass with {sup 14}C. Estimates of true mass are provided with tritium-labeled compounds, even when tritium loss is by exchange with protons or through futile cycling. Estimates of the amount (body mass) of lactate, alanine, glutamate, and proline obtained with tritium-labeled compounds are presented. Most of these masses are intracellular. The concentration of lactate in tissues equals or is greater, and that of amino acids much greater than that in plasma. Hence, the so-called distribution space for these compounds, calculated conventionally by dividing mass by plasma concentration, would appear to be equal to or greater than the body water of lactate, and several liters per kilogram for amino acids.

  10. Dynamics of ellipsoidal tracers in swimming algal suspensions

    Science.gov (United States)

    Yang, Ou; Peng, Yi; Liu, Zhengyang; Tang, Chao; Xu, Xinliang; Cheng, Xiang

    2016-10-01

    Enhanced diffusion of passive tracers immersed in active fluids is a universal feature of active fluids and has been extensively studied in recent years. Similar to microrheology for equilibrium complex fluids, the unusual enhanced particle dynamics reveal intrinsic properties of active fluids. Nevertheless, previous studies have shown that the translational dynamics of spherical tracers are qualitatively similar, independent of whether active particles are pushers or pullers—the two fundamental classes of active fluids. Is it possible to distinguish pushers from pullers by simply imaging the dynamics of passive tracers? Here, we investigated the diffusion of isolated ellipsoids in algal C. reinhardtii suspensions—a model for puller-type active fluids. In combination with our previous results on pusher-type E. coli suspensions [Peng et al., Phys. Rev. Lett. 116, 068303 (2016), 10.1103/PhysRevLett.116.068303], we showed that the dynamics of asymmetric tracers show a profound difference in pushers and pullers due to their rotational degree of freedom. Although the laboratory-frame translation and rotation of ellipsoids are enhanced in both pushers and pullers, similar to spherical tracers, the anisotropic diffusion in the body frame of ellipsoids shows opposite trends in the two classes of active fluids. An ellipsoid diffuses fastest along its major axis when immersed in pullers, whereas it diffuses slowest along the major axis in pushers. This striking difference can be qualitatively explained using a simple hydrodynamic model. In addition, our study on algal suspensions reveals that the influence of the near-field advection of algal swimming flows on the translation and rotation of ellipsoids shows different ranges and strengths. Our work provides not only new insights into universal organizing principles of active fluids, but also a convenient tool for detecting the class of active particles.

  11. A Lagrangian particle method with remeshing for tracer transport on the sphere

    Science.gov (United States)

    Bosler, Peter A.; Kent, James; Krasny, Robert; Jablonowski, Christiane

    2017-07-01

    A Lagrangian particle method (called LPM) based on the flow map is presented for tracer transport on the sphere. The particles carry tracer values and are located at the centers and vertices of triangular Lagrangian panels. Remeshing is applied to control particle disorder and two schemes are compared, one using direct tracer interpolation and another using inverse flow map interpolation with sampling of the initial tracer density. Test cases include a moving-vortices flow and reversing-deformational flow with both zero and nonzero divergence, as well as smooth and discontinuous tracers. We examine the accuracy of the computed tracer density and tracer integral, and preservation of nonlinear correlation in a pair of tracers. We compare results obtained using LPM and the Lin-Rood finite-volume scheme. An adaptive particle/panel refinement scheme is demonstrated.

  12. Interventional magnetic resonance imaging - non-invasive imaging for interventions; Interventionelle Magnetresonanztomographie - nichtinvasive Bildgebung fuer Interventionen

    Energy Technology Data Exchange (ETDEWEB)

    Buecker, A.; Adam, G.; Neuerburg, J.M.; Glowinski, A.; Tacke, J.; Guenther, R.W. [Technische Hochschule Aachen (Germany). Medizinische Fakultaet

    2000-02-01

    As a prerequisite for MR-guidance of interventional procedures, instruments have to be well depicted in the MR image without obscuring or distorting the underlying anatomy. For non-vascular interventions the imaging speed has to be in the range of seconds while control of vascular interventions requires real time imaging speed. The imaging contrast has to be maintained as well as a high spatial resolution. Furthermore, sufficient patient access has to be provided by the MR scanner. Neither an ideal magnet nor the optimal single sequence are available to fulfill the above-mentioned criteria. The type of sequence - gradient echo versus spin echo - together with changing of the echo time and phase encording direction will ensure an appropriate size of the artifact and thereby of the appearance of the instrument in the MR image. The feasibility of non-vascular MR-guided interventions has been proved at field strengths ranging from 0.064 T to 1.5 T. Bone biopsies, soft tissue biopsies, drainages, and control of interstitial thermo- and cryotherapy have been reported. For vascular interventions, different real time MR strategies are currently under investigation. The development of dedicated catheters and guide wires has enabled MR-guided dilatations, stenting, placement of vena cava filters, and TIPS procedures. Considering the fast progress being made in this field, there can be no question that interventional MRI will become a well-accepted clinical tool offering potential advantages such as excellent soft tissue contrast, multiplanar imaging, flow measurements, high resolution imaging of vessel walls, and lack of ionizing radiation. (orig.) [German] Zur Durchfuehrung MR-gesteuerter Interventionen muessen interventionelle Instrumente gut sichtbar, aber ohne stoerende Artefakte darstellbar sein. Die Geschwindigkeit der Bilderstellung sollte fuer nichtvaskulaere Interventionen im Sekundenbereich liegen und fuer vaskulaere Interventionen Echtzeitbildgebung liefern. Weder

  13. Investigation of a matrix converter for contactless power transmission systems; Untersuchung eines Matrixumrichters fuer kontaktlose Energieuebertragungssysteme

    Energy Technology Data Exchange (ETDEWEB)

    Ecklebe, Andreas

    2009-05-22

    Arbeit beschaeftigt sich mit einem drei- zu zweiphasigen Matrixumrichter zur Speisung von kontaktlosen Energieuebertragungssystemen. Aufbauend auf einer Darlegung relevanter Untersuchungen zur Thematik werden zunaechst moegliche Resonanzanordnungen fuer kontaktlose Energieuebertragungssysteme untersucht. Die Betrachtung wichtiger elektrischer Parameter zeigt neben den Unterschieden der einzelnen Anordnungen auch, dass fuer eine auf den speisenden Umrichter fokussierte Untersuchung eine einfache Modellierung der drei untersuchten Resonanzanordnungen mit Hilfe eines Reihenschwingkreises moeglich ist. Als Konsequenz ergibt sich die Schlussfolgerung, dass sich die erzielten Ergebnisse auch fuer den Matrixumrichter mit anderen serienresonanten Lasten anwenden lassen. Der zweite Teil der Arbeit ist der Untersuchung des Matrixumrichters gewidmet. Basierend auf einer theoretischen Beschreibung wird die Kombination von hochfrequenten Steuerverfahren - wie z.B. der Blocktaktung - und niederfrequenten Pulsmustern zur Stellung des Oberschwingungsgehalts der Netzstroeme vorgestellt. Die Aehnlichkeit des Umrichters zu einem konventionellen Wechselrichter in H-Brueckenschaltung ermoeglicht anschliessend eine Betrachtung der Kommutierung und die Ableitung notwendiger Schaltzustaende. Diese sind dadurch gekennzeichnet, dass zu jedem Zeitpunkt genau eine bidirektionale Verbindung vom Eingangssystem zu jeder Ausgangsphase besteht. Die Funktionsweise der Kommutierung wie auch des gesamten Umrichters wird in einem ersten Schritt simulativ belegt. Dabei wird auch das dynamische Schaltverhalten der Leistungshalbleiter beruecksichtigt. Anschliessend werden an einem Laboraufbau aufgenommene Messergebnisse vorgestellt und mit den theoretischen Ergebnissen verglichen. Der Laboraufbau besteht aus dem Leistungsteil des Matrixumrichters mit Eingangsfiltern und modularen Gate-Treibern, einem DSP/FPGA-Steuerungssystem und einem kontaktlosen Energieuebertragungssystem mit sekundaerseitigem Gleichrichter

  14. Investigation of a matrix converter for contactless power transmission systems; Untersuchung eines Matrixumrichters fuer kontaktlose Energieuebertragungssysteme

    Energy Technology Data Exchange (ETDEWEB)

    Ecklebe, Andreas

    2009-05-22

    Arbeit beschaeftigt sich mit einem drei- zu zweiphasigen Matrixumrichter zur Speisung von kontaktlosen Energieuebertragungssystemen. Aufbauend auf einer Darlegung relevanter Untersuchungen zur Thematik werden zunaechst moegliche Resonanzanordnungen fuer kontaktlose Energieuebertragungssysteme untersucht. Die Betrachtung wichtiger elektrischer Parameter zeigt neben den Unterschieden der einzelnen Anordnungen auch, dass fuer eine auf den speisenden Umrichter fokussierte Untersuchung eine einfache Modellierung der drei untersuchten Resonanzanordnungen mit Hilfe eines Reihenschwingkreises moeglich ist. Als Konsequenz ergibt sich die Schlussfolgerung, dass sich die erzielten Ergebnisse auch fuer den Matrixumrichter mit anderen serienresonanten Lasten anwenden lassen. Der zweite Teil der Arbeit ist der Untersuchung des Matrixumrichters gewidmet. Basierend auf einer theoretischen Beschreibung wird die Kombination von hochfrequenten Steuerverfahren - wie z.B. der Blocktaktung - und niederfrequenten Pulsmustern zur Stellung des Oberschwingungsgehalts der Netzstroeme vorgestellt. Die Aehnlichkeit des Umrichters zu einem konventionellen Wechselrichter in H-Brueckenschaltung ermoeglicht anschliessend eine Betrachtung der Kommutierung und die Ableitung notwendiger Schaltzustaende. Diese sind dadurch gekennzeichnet, dass zu jedem Zeitpunkt genau eine bidirektionale Verbindung vom Eingangssystem zu jeder Ausgangsphase besteht. Die Funktionsweise der Kommutierung wie auch des gesamten Umrichters wird in einem ersten Schritt simulativ belegt. Dabei wird auch das dynamische Schaltverhalten der Leistungshalbleiter beruecksichtigt. Anschliessend werden an einem Laboraufbau aufgenommene Messergebnisse vorgestellt und mit den theoretischen Ergebnissen verglichen. Der Laboraufbau besteht aus dem Leistungsteil des Matrixumrichters mit Eingangsfiltern und modularen Gate-Treibern, einem DSP/FPGA-Steuerungssystem und einem kontaktlosen Energieuebertragungssystem mit sekundaerseitigem Gleichrichter

  15. Multiple myoma: current recommendations for imaging; Multiples Myelom: Aktuelle Empfehlungen fuer die Bildgebung

    Energy Technology Data Exchange (ETDEWEB)

    Hillengass, J. [Medizinische Universitaetsklinik, Abteilung fuer Haematologie, Onkologie und Rheumatologie, Heidelberg (Germany); Deutsches Krebsforschungszentrum, Abteilung Radiologie E010, Heidelberg (Germany); Delorme, S. [Deutsches Krebsforschungszentrum, Abteilung Radiologie E010, Heidelberg (Germany)

    2012-04-15

    zur Erfassung umschriebener Knochendestruktionen, von Osteoporose oder Frakturen. Die Ganzkoerper-low-dose-CT und Ganzkoerper-MRT ermoeglichen eine Darstellung sowohl des mineralisierten Knochens als auch des Knochenmarks mit einer hoeheren Sensitivitaet, hoeherem Patientenkomfort und im Falle der MRT ohne Strahlenbelastung. Nach den Ergebnissen der Literatur sind Schnittbildverfahren dem Roentgenskelettstatus signifikant ueberlegen, wobei die Ganzkoerper-MRT fuer den Nachweis insbesondere eines diffusen Knochenmarkbefalls signifikant besser ist als die Ganzkoerper-CT. Praktisch jeder osteodestruktive Herd ist in der MRT sichtbar. Allerdings ist fuer die Beurteilung der Osteodestruktion selbst wiederum eine CT erforderlich. Die Sensitivitaeten von PET/CT und MRT sind vergleichbar. Wie bereits in einigen Zentren insbesondere in Deutschland umgesetzt, sollten bei Verfuegbarkeit das Ganzkoerper-MRT und das Ganzkoerper-CT den konventionellen Roentgenskelettstatus ersetzen. Bei Erstdiagnose bzw. Verdacht auf eine monoklonale Gammopathie unklarer Signifikanz (MGUS), ''smoldering multiple myeloma'' und symptomatisches multiples Myelom sollten sowohl eine Ganzkoerper-MRT als auch eine Ganzkoerper-CT durchgefuehrt werden. Bei asymptomatischem Myelom oder MGUS waere die Ganzkoerper-MRT bis zur Detektion des ersten umschriebenen Myelomherdes ausreichend. Beim symptomatischen Myelom mit Knochenlaesionen sollten in der Regel die Ganzkoerper-CT und fuer spezielle Fragestellungen die MRT eingesetzt werden. (orig.)

  16. High nitrogen steels for internal combustion engines. Final report; Druckaufgestickte Staehle fuer Verbrennungsmotore. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Horn, H.; Knuth, L.U.

    1998-07-01

    The aim of the study was the investigation of the weldability of martensitic and austenitic high nitrogen steels (HNS) in the case of valve applications. Friction welding and surfacing with the plasma-transferred arc hardfacing process is necessary for these applications. Because friction welding is a welding process in the range of the upper forging temperature and a melting zone during the welding does not take place, the nitrogen content in the base alloy is not affected. Therefore, friction welds with good properties can be produced. During the plasma process the HNS were remelted with the effect of a decreasing nitrogen content and formation of pores in the surfacing layer. Surfacing with a mixed argon-nitrogen gas with a nitrogen content more than 40% leads to porefree weldments. On the other hand, the stability of the plasma arc and the durability of the tungsten electrode decreases rapidly. Alloying of the HNS with nitrogen-affined elements like Niob a.o. is conductive to get porefree weldments also with nitrogen poor (ca 5%) plasma gas. In this case the welding process is in a controlled and reproducible condition and the hardness of the surface layer is in accordance with the requirements. (orig.) [German] In dem Forschungsvorhaben wurde die Schweisseignung von druckaufgestickten austenitischen und martensitischen Staehlen fuer den Einsatz als Ventilwerkstoffe untersucht. Bestimmend fuer diesen Einsatzfall sind das Plasma-Pulver-Auftragschweissen und das Reibschweissen. Die Reibschweisseignung der genannten Staehle ist sowohl untereinander als auch mit konventionellen Ventilstaehlen gegeben. Bei dem Plasma-Pulver-Auftragschweissen werden die druckaufgestickten Grundwerkstoffe verfahrensbedingt wieder aufgeschmolzen. Dies fuehrt zum Austreten des zwangsgeloesten Stickstoffes und damit zur unzulaessigen Porenbildung in der Auftragschweissung. Durch die Zugabe von Stickstoff zu dem Plasmagas kann die Porenbildung deutlich reduziert und mit Stickstoffgehalten

  17. Intercomparison of radon gas detectors 2001 at PSI; Die Vergleichsmessung 2001 fuer Radongasmessgeraete am PSI

    Energy Technology Data Exchange (ETDEWEB)

    Butterweck, Gernot; Schuler, Christoph

    2001-06-01

    Fifteen radon measurement services participated in the 2001 Radon Intercomparison Exercise performed at the Reference Laboratory for Radon Gas Activity Concentration Measurements at Paul Scherrer Institut (PSI) during March 2nd to 11th, 2001. Eleven of these laboratories were approved by the Swiss Federal Office of Public Health and their participation in the intercomparison exercise was a requirement to warrant traceability to national or international standards. Radon gas detectors (etched-track and electret ionization chambers) and instruments (ionization chambers and electrostatic precipitation) were exposed in the PSI Radon Chamber in a reference atmosphere with an average radon gas concentration of 6100 Bqm{sup -3} leading to a radon gas exposure of 1300 kBqhm{sup -3}. Due to the low aerosol concentration during this intercomparison exercise, etched-track detectors without diffusion chamber showed a significant deviation to the reference exposure and an increase of the standard deviation of an ensemble of five detectors compared to intercomparisons with aerosol concentration in the specified range of these detectors. Radon monitors with electrostatic precipitation, which were recently introduced on the Swiss market, showed insufficient factory calibration and correction of the influence of air humidity on the measured radon gas activity concentrations. (author) [German] Kandidaten fuer diese vom 2. bis 11. Maerz 2001 durchgefuehrte Vergleichsmessung waren Firmen, Institutionen oder Privatpersonen, welche die Anerkennung des Bundesamtes fuer Gesundheit (BAG) als Radonmessstelle besitzen und deshalb nachweisen muessen, dass die geforderte Rueckverfolgbarkeit der Messresultate auf national oder international anerkannte Normale gewaehrleistet ist. Dem Aufruf des BAG zur Teilnahme folgten neben 11 anerkannten vier weitere Messstellen. Sechs verschiedene Detektor- oder Messgeraetearten waren vertreten. Neben Kernspurdetektoren wurden bei den passiven Systemen

  18. Physics for physicians; 2. rev. and enl. ed.; Physik fuer Mediziner

    Energy Technology Data Exchange (ETDEWEB)

    Kamke, D. [Bochum Univ. (Germany); Walcher, W. [Marburg Univ. (Germany)

    1994-12-31

    The book is based on lectures read by the authors at medical schools and tailored towards the specific requirements of medical students through a careful selection of subjects, special attention to pertinent medical aspects as well as examples and calculations throwing light on the question of quantity. The book wants to provide insights into the links between physics and some domains of biology and medicine and lead to a better understanding of the magnitudes involved. Being a textbook on physics, the book has adopted the methodology of this science in that results obtained through experimental work are verbally described and closely defined in order to set up rules which would finally permit quantitative determinations to be made on the basis of arithmetic laws. The divisions in this book were made according to a system slightly different from that usually followed. Phenomena of a similar nature are dealt with simultaneously and particular emphasis is placed on an atomistic approach to the problems dealt with. One chapter, ``Physical Principles Underlying the Methods of Medical Imaging`` (X-ray CT, radionuclide procedures, nmr imaging, sonographic), has been added altogether. (orig./HP) [Deutsch] Das Buch ist aus Vorlesungen entstanden, die die Verfasser an ihren Hochschulen speziell fuer angehende Mediziner gehalten haben und die auf deren besondere Beduerfnisse abgestellt waren: durch geeignete Stoffauswahl, durch Betonung medizinischer Aspekte sowie durch Beispiele und Rechenaufgaben, die ans Quantitative heranfuehren. So wil dieses Buch dem Leser Einsicht in die Verknuepfung der Physik mit biologisch-medizinischen Teilbereichen geben und ein Gefuehl fuer die dabei vorkommenden Gruessenordnungen vermitteln. Das Buch ist ein Lehrbuch der Physik, das der Methode der Physik folgt und vom experimentell erarbeiteten und mit Worten beschriebenen Sachverhalt zum exakt definierten Begriff kommt, mit solchen Begriffen Gesetze formuliert, die mit Hilfe der Regeln der

  19. Water alert 2000. The new concept for FEW hydroelectric power plants; Wasseralarm 2000. Anwendungsprojekt des neuen Konzepts fuer die Wasserkraftwerke der FEW

    Energy Technology Data Exchange (ETDEWEB)

    Comte, B. [FEW Freiburgische Elektrizitaetswerke, Abt. Betrieb und Erzeugung, Broc (Switzerland); Grangier, J.P. [FEW Freiburgische Elektrizitaetswerke, Abt. Betrieb und Erzeugung, Broc (Switzerland)

    1996-02-02

    This project explains the principle of application of the new concept `Water alert 2000` of the Freiburgische Elektrizitaetswerke (FEW) for their power stations at Montsalvens, Rossens and Schiffenen. Prior to its implementation, the principle of application must be approved by the responsible military authorities. the article describes the alarm system; information transfer is left out of account. (orig.) [Deutsch] Das vorliegende Projekt erlaeutert das Anwendungsprinzip der Freiburgischen Elektrizitaetswerke (FEW) fuer das neue Konzept `Wasseralarm 2000` im Rahmen der Ueberwachung der Kraftwerke Montsalvens, Rossens und Schiffenen. Vor seiner Realisierung muss das Anwendungsprinzip noch dem Bundesamt fuer Militaerflugplaetze und dem Stab der Gruppe fuer Generalstabsdienste zur Genehmigung unterbreitet werden. Dieser Artikel behandelt ausschliesslich den Teil `Alarmausloesung`, nicht aber das Gebiet `Informationsuebermittlung`. (orig.)

  20. Assessment of the potential of the Mainfranken region, northern Bavaria, for underground storage of geothermal energy; Erkundung des regionalen Potentials fuer die Untergrundspeicherung thermischer Energie in Mainfranken (UTEM)

    Energy Technology Data Exchange (ETDEWEB)

    Barthel, R.; Heinrichs, G.; Udluft, P. [Lehr- und Forschungsbereich Hydrogeologie und Umwelt, Inst. fuer Geologie, Univ. Wuerzburg (Germany); Ebert, H.P.; Fricke, J. [Abt. Waermedaemmung/Waermetransport, Bayerisches Zentrum fuer Angewandte Energieforschung e.V., Wuerzburg (Germany)

    1997-12-01

    The following paper presents a research project that is planned as a cooperation of the Geological Institute, University of Wuerzburg and the Bavarian Center of Applied Energy Research. In this project the potentials for underground thermal energy storage will be investigated in the region of Mainfranken, Northern Bavaria (Main = the river `Main`, Franken = Franconia). All aspects of underground storage will be studied with respect to the specific geographical and geological situation of the area. The study will provide a detailed map of possible storage sites, from which several case studies and at least one demonstration projects will result. (orig.) [Deutsch] Im vorliegenden Beitrag wird ein Forschungsprojekt vorgestellt, das gemeinsam vom Institut fuer Geologie der Universitaet Wuerzburg und dem Zentrum fuer Angewandte Energieforschung in Bayern geplant wird. Ziel des Projekts ist die Erkundung des Potentials fuer die Untergrundspeicherung thermischer Energie in Mainfranken (Nordbayern). Alle Aspekte der Untergrundspeicherung werden regionalspezifisch betrachtet. Neben der Erstellung differenzierter Karten geeigneter Standorte sind Fallstudien und Demonstrationsprojekte in Planung. (orig.)

  1. Practical experience with R32 mixtures as replacement substances for R22 and R502; Praxiserfahrungen mit R32-Gemischen als Austauschstoffe fuer R22 und R502

    Energy Technology Data Exchange (ETDEWEB)

    Schwennesen, K. [Deutsche ICI GmbH, Frankfurt am Main (Germany)

    1995-12-31

    Like R11 and R12, the refrigerant R502 will soon belong to the past and the steps for the prohibition of use of R22 have already been taken. Due to both its thermo-physical properties and its relatively low greenhouse gas potential, R32 is an important part of replacement refrigerants compatible with the ozone layer for both R22 and R502. There is a report on practical experience with R407A and R407C here. (orig.) [Deutsch] Das Kaeltemittel R 502 wird, wie R 11 und R 12, in naechster Zukunft der Vergangenheit angehoeren und auch fuer R 22 sind die Schritte zu Verwendungsverboten bereits festgelegt. R 32 ist sowohl aufgrund seiner thermophysikalischen Eigenschaften als auch wegen seines relative niedrigen Treibhauspotentials eine bedeutende Komponente in ozonvertraeglichen Austauschkaeltemitteln sowohl fuer R 22 als uach fuer R 502. Ueber Praxiserfahrungen mit R 407A und R 407C wird hier berichtet. (orig.)

  2. Assessment of Halon-1301 as a groundwater age tracer

    Directory of Open Access Journals (Sweden)

    M. Beyer

    2015-01-01

    Full Text Available Groundwater dating is an important tool to assess groundwater resources in regards to their dynamics, i.e. direction and time scale of groundwater flow and recharge, to assess contamination risks and manage remediation. To infer groundwater age information, a combination of different environmental tracers, such as tritium and SF6, are commonly used. However, ambiguous age interpretations are often faced, due to a limited set of available tracers and their individual restricted application ranges. For more robust groundwater dating multiple tracers need to be applied complementarily and it is vital that additional, groundwater age tracers are found to ensure robust groundwater dating in future. We recently suggested that Halon-1301, a water soluble and entirely anthropogenic gaseous substance, may be a promising candidate, but its behaviour in water and suitability as a groundwater age tracer had not yet been assessed in detail. In this study, we determine Halon-1301 and infer age information in 17 New Zealand groundwaters and various modern (river water samples. The samples are simultaneously analysed for Halon-1301 and SF6, which allows identification of issues such as contamination of the water with modern air during sampling. Water at all analysed groundwater sites have also been previously dated with tritium, CFC-12, CFC-11 and SF6, and exhibit mean residence times ranging from modern (close to 0 years to over 100 years. The investigated groundwater ranged from oxic to highly anoxic, and some showed evidence of CFC contamination or degradation. This allowed us to make a first attempt of assessing the conservativeness of Halon-1301 in water, in terms of presence of local sources and its sensitivity towards degradation etc., which could affect the suitability of Halon-1301 as groundwater age tracer. Overall we found Halon-1301 reliably inferred the mean residence time of groundwater recharged between 1980 and 2014. Where direct age comparison

  3. Identification and characterization of conservative organic tracers for use as hydrologic tracers for the Yucca Mountain Site Characterization Study; Progress report, June 1--December 31, 1990

    Energy Technology Data Exchange (ETDEWEB)

    Stetzenbach, K.J.

    1990-12-31

    Ground water tracers are solutes dissolved in or carried by ground water to delineate flow pathways. Tracers provide information on direction and speed of water movement and that of contaminants that might be conveyed by the water. Tracers can also be used to measure effective porosity, hydraulic conductivity, dispersivity and solute distribution coefficients. For most applications tracers should be conservative, that is, move at the same rate as the water and not sorb to aquifer materials. Tracers must have a number of properties to be functional. Regardless of the desired properties, the chemical and physical behavior of a tracer in ground water and the porous medium under study must be understood. Good estimates of tracer behavior can be obtained from laboratory studies. Studies in this proposal will address tracer properties with analytical method development, static sorption and degradation studies and column transport studies, Mutagenicity tests will be performed on promising candidates. The tracers that will be used for these experiments are fluorinated organic acids and other organic compounds that have the chemical and biological stability necessary to be effective in the Yucca Mountain environment. Special emphasis will be placed on compounds that fluoresce or have very large ultraviolet absorption coefficients for very high analytical sensitivity.

  4. Model for occurrence orientated knowledge management in construction companies; Prozessmodell fuer ereignisorientiertes Wissensmanagement in Bauunternehmungen

    Energy Technology Data Exchange (ETDEWEB)

    Girmscheid, G. [Institut fuer Bauplanung und Baubetrieb, Zuerich (Switzerland); Schmidle, C.M. [Ed. Zueblin AG, Stuttgart (Germany)

    2003-07-01

    Due to the insufficient transfer of knowledge from projects, construction company organisations do not use the potentials for their competitive advantage. In this paper a knowledge management process will be presented for the identification, classification and allocation of knowledge integrated in the controlling process of enterprises, which is bounded to civil works occurrence. The presented occurrence orientated knowledge process model was developed at the Swiss Federal Institute of Technology in Zurich. This is not a holistic knowledge management concept for a construction company; it is focused on the process and the relevant participants and users. (orig.) [German] Durch den ungenuegenden Wissenstransfer von Projektwissen werden von Bauunternehmungen potentielle Synergien zur Verbesserung der Wettbewerbsfaehigkeit nicht ausreichend genutzt. In diesem Beitrag wird ein Wissensmanagementprozess dargestellt, der an der ETH Zuerich entwickelt wurde, welcher ereignisorientiertes Wissen in Bauunternehmungen identifiziert, hinsichtlich der Zielpersonen klassifiziert und dieses Wissen zur Nutzung in Projekten bereitstellt. Fuer die Identifikation werden Instrumente des Controlling herangezogen. Dieses Wissensmanagementkonzept soll einen kontinuierlichen Verbesserungsprozess auf der Basis des ereignisorientierten Wissens einleiten, um aus positiven sowie negativen Ereignissen in den Bauprojekten zu lernen und so zu einer lernenden Organisation zu gelangen. (orig.)

  5. Potentials for the use of titanium in series car production; Einsatzpotentiale fuer Titan im Serienfahrzeug

    Energy Technology Data Exchange (ETDEWEB)

    Schauerte, O.; Eisenberg, S.; Kramer, M. [Volkswagenwerk AG, Wolfsburg (Germany); Faller, K. [Timet, Denver, CO (United States)

    1999-07-01

    Usually, in automotive manufacturing, titanium is only found in racing cars because of cost reasons. But since weight reduction is becoming more and more important in car development, the automotive industry is showing a growing readiness to work more intensively with this material. Titanium and its alloys are attractive because of high specific strength, the pronounced elastic deformation behaviour and the excellent corrosion resistance. This proves the material to be suitable for applications such as connecting rods, exhausts, springs and bolts. The history of the titanium industry suggests that in the near term, no drastic price reductions can be expected. This paper discusses how solutions for the use of titanium in series car production may be found by close cooperation between titanium and automotive manufacturers. (orig.) [German] Im Bereich des Fahrzeugbaus fand Titan bisher aus Kostengruenden nur im Rennsport Verwendung. Da aber die Gewichtsreduzierung bei Serienfahrzeugen eine immer bedeutendere Rolle spielt, waechst in der Automobilindustrie die Bereitschaft, sich intensiver mit diesem Werkstoff zu befassen. Die Attraktivitaet von Titan- und Titanlegierungen resultiert aus ihrer hohen spezifischen Festigkeit, dem hohen elastischen Aufnahmevermoegen und der ausgezeichneten Korrosionsbestaendigkeit. Dies praedestiniert diesen Werkstoff fuer Anwendungen wie z.B. Pleuel, Abgasanlagen, Fahrwerkfedern und Schrauben. Ein Blick in die Geschichte der Titanindustrie zeigt, dass kurzfristig keine drastischen Preisreduzierungen zu erzielen sind, dass aber im Rahmen einer von Automobil- und Titanherstellern gleichermassen verfolgten Gesamtstrategie Loesungen gefunden werden koennen. (orig.)

  6. Point of view. Maize for biogas production in Thuringia; Standpunkt. Maisanbau fuer die Biogaserzeugung in Thueringen

    Energy Technology Data Exchange (ETDEWEB)

    Reinhold, Gerd; Peyker, Walter; Zorn, Wilfried; Strauss, Christoph; Struempfel, Juergen; Vetter, Armin; Degner, Joachim

    2011-04-15

    In Thuringia the maize represents with a current size of the cultivation of less than 10% and a cultivation concentration of less than 20% in every county an enrichment of crop rotation. The recycling of the digestate in the farm results due to higher C-reduction stability of the fermentation products to any deterioration of the C balance and soil fertility. Especially in Thuringia farming regions with very low livestock the introduction of biogas plants introduces to a higher diversity of agricultural production and dispersal of crop rotation. Practiced by the combination of locally adapted biogas plants with animal husbandry (milk production = use manure, pig = heat utilization) positive economic and environmental effects can be achieved for the Thuringian farmers. [German] In Thueringen stellt der Mais bei einem gegenwaertigen Anbauumfang von unter 10 % und einer Anbaukonzentration von unter 20 % in jedem Landkreis eine Bereicherung der Fruchtfolge dar. Die Verwertung der Gaerreste im Betrieb fuehrt infolge hoeherer C-Abbaustabilitaet der Gaerprodukte zu keiner Verschlechterung der C-Bilanz und der Bodenfruchtbarkeit. Besonders in Thueringer Ackerbauregionen mit sehr geringem Tierbesatz traegt die Einfuehrung von Biogasanlagen zu einer hoeheren Vielfalt der landwirtschaftlichen Produktion und Auflockerung der Fruchtfolgen bei. Durch die praktizierte Kombination von standortangepassten Biogasanlagen mit der Tierhaltung (Milcherzeugung = Guellenutzung, Schweinehaltung = Waermenutzung) werden fuer die Thueringer Landwirte positive oekonomische und oekologische Effekte erzielt.

  7. Financial plans for thermal waste treatment plants; Finanzierungsmodelle fuer thermische Abfallbehandlungsanlagen

    Energy Technology Data Exchange (ETDEWEB)

    Soehndel, B. [Zweckverband Restmuellheizkraftwerk, Boeblingen (Germany); Faulstich, M. [Technische Univ. Muenchen, Garching (Germany). Lehrstuhl fuer Wasserguete- und Abfallwirtschaft

    1998-09-01

    There are various financing and organisation models in use at German waste treatment plants. These models have an influence on capital costs as well as on operating costs. The great variety of existing models, which is not only found in theory but also in practice, is a sure indication that there is no universal solution at present but that models always have to be adapted to the current conditions governing the plant in question (e.g., tax law amendments). In view of the great complexity of this subject the following deliberations will be restricted to only the best-known types of financing model. [Deutsch] Fuer den Betrieb von Abfallbehandlungsanlagen gibt es bundesweit verschiedene Organisations- und Finanzierungsmodelle. Diese Modelle haben Auswirkungen auf die Kapitalkosten und die Betriebskosten. Die Vielfalt der nicht nur theoretisch moeglichen, sondern auch der in der Praxis existierenden Modelle ist mit Sicherheit ein Hinweis, dass derzeit keine universelle Loesung moeglich ist, sondern diese immer den aktuellen und spezifischen Verhaeltnissen (z.B. Steuerrechtsaenderung u.a.) angepasst werden muss. Auf Grund der Komplexibilitaet beschraenken sich die nachfolgenden Ausfuehrungen ausschliesslich auf die bekanntesten Formen der Finanzierungsmodelle. (orig./SR)

  8. Methods of heat transformation for solar facilities in buildings; Verfahren der Waermetransformation fuer die solare Gebaeudetechnik

    Energy Technology Data Exchange (ETDEWEB)

    Henning, H.M. [Fraunhofer-Inst. fuer Solare Energiesysteme, Freiburg (Germany). Gruppe Aktive Thermische Systeme; Treffinger, P. [Deutsche Zentrum fuer Luft- und Raumfahrt (DLR), Lampoldshausen (Germany). Inst. fuer Technische Thermodynamik

    1998-02-01

    Processes in which a heat pump cycle is driven by thermal energy may be defined as heat transformation processes. The technical realization of this type of processes in general is based on sorption techniques. Depending on the temperature level of the utilized heat these technologies may be used for either cooling or heating of buildings. The paper presents state-of-the-art technologies and new developments. It comprises solar cooling of buildings, utilization of environmental energy sources (earth, air) by thermal driven heat pumps and seasonal storage of solar thermal energy by means of sorption processes. (orig.) [Deutsch] Unter Waermetransformationsverfahren werden im allgemeinen Verfahren verstanden, in denen ein Waermepumpenprozess mit thermischer Energie angetrieben wird. Die technische Realisierung dieser Verfahren erfolgt ueberwiegend mit Hilfe von Sorptionsvorgaengen. Abhaengig vom Temperaturniveau des Nutzwaermestroms koennen solche Verfahren im Gebaeudebereich fuer die Kuehlung oder Heizung eingesetzt werden. Im Beitrag werden der Stand der Technik sowie neue Entwicklungen vorgestellt. Im einzelnen umfasst der Beitrag die solare Kuehlung von Gebaeuden, die Nutzung von Umweltenergie (Erdreich, Luft) mittels thermisch angetriebener Waermepumpen sowie die saisonale Speicherung von Solarenergie ueber Sorptionsprozesse. (orig.)

  9. Dioxin budget for Hamburg. Summation report; Dioxin-Bilanz fuer Hamburg. Zusammenfassender Endbericht

    Energy Technology Data Exchange (ETDEWEB)

    Hutzinger, O. [Bayreuth Univ. (Germany). Lehrstuhl fuer Oekologische Chemie und Geochemie; Fiedler, H. [Bayreuth Univ. (Germany). Lehrstuhl fuer Oekologische Chemie und Geochemie; Lau, C. [Bayreuth Univ. (Germany). Lehrstuhl fuer Oekologische Chemie und Geochemie; Rippen, G. [Trischler und Partner GmbH, Darmstadt (Germany); Blotenberg, U. [Trischler und Partner GmbH, Darmstadt (Germany); Wesp, H. [Trischler und Partner GmbH, Darmstadt (Germany); Sievers, S. [Umweltbehoerde, Hamburg (Germany). Amt fuer Umweltschutz; Friesel, P. [Umweltbehoerde, Hamburg (Germany). Amt fuer Umweltschutz; Gras, B. [Umweltbehoerde, Hamburg (Germany). Amt fuer Umweltschutz; Reich, T. [Umweltbehoerde, Hamburg (Germany). Amt fuer Umweltschutz; Schacht, U. [Umweltbehoerde, Hamburg (Germany). Amt fuer Umweltschutz; Schwoerer, R. [Umweltbehoerde, Hamburg (Germany). Amt fuer Umweltschutz

    1995-09-01

    The following questions were foremost in making up the dioxin budget for Hamburg and are answered by the expertise now on hand: - Which sources contribute appreciably in Hamburg to environmental dioxin pollution? - What is the contribution of known abandoned sites? - How much has been achieved by executed measures for cutting down environmental receipts of dioxin? - Are there areas not yet sufficiently considered that have an essential influence on human dioxin exposure? - How does dioxin reach people (see above) and - not lastly - how does the exposure of the Hamburg population compare to that of the average German citizen? Does a special exposure situation exist, for instance in the form of special eating habits such as higher consumption of fish or the specific environmental situation in Hamburg? (orig./SR) [Deutsch] Fragen, die bei der Dioxin-Bilanz fuer Hamburg besonders im Vordergrund standen und die das jetzt vorgelegte Gutachten vor allem beantwortet waren: - Welche Quellen tragen in Hamburg nennenswert zur Dioxinbelastung der Umwelt bei? - Welchen Einfluss haben die bekannten Altlasten? - Was haben bisher schon getroffene Massnahmen zur Reduzierung der Eintraege von Dioxinen in der Umwelt erreicht? - Gibt es bisher noch nicht genuegend beruecksichtigte Bereiche, die die Dioxinbelastung des Menschen wesentlich beeinflussen? - Wie kommt das Dioxin zum Menschen (siehe oben) und - nicht zuletzt - wie sieht die Belastung der Hamburger Bevoelkerung im Vergleich zum Bundesdurchschnitt aus? Gibt es eine besondere Exposition z.B. durch spezielle Ernaehrungsgewohnheiten wie etwa erhoehter Fischverzehr oder die spezifische Umweltsituation in Hamburg? (orig.)

  10. Drive design. Mechatronics for production and logistics; Antriebsloesungen. Mechatronik fuer Produktion und Logistik

    Energy Technology Data Exchange (ETDEWEB)

    Kiel, Edwin (ed.) [Lenze AG, Aerzen (Germany)

    2007-07-01

    Highly automated production and logistic systems require mechatronic drives. The book describes how industrial production and logistics work, and how the appropriate drive systems should be designed. The function of the mechanical and electronic elements of a drive system is described, including the required software, and the fundamentals of dimensioning are gone into. The authors also discuss engineering, reliability and important life cycle aspects. Applications in material flow and handling technology, in continuous and clocked production lines and finishing processes are presented in twelve sections offering different drive solutions for the motor, current inverter and software, transmission system and mechanical elements. The specific requirements and functionalities of these twelve solutions are presented. The focus is on energy conversion with controlled electric drive systems. (orig.) [German] Hochautomatisierte Produktions- und Logistikanlagen benoetigen mechatronische Antriebsloesungen. Dieses Buch beschreibt, wie die industrielle Fertigung und Logistik arbeitet und wie die hierzu erforderlichen Antriebsloesungen aufgebaut sind. Es wird die Funktionsweise der mechanischen und der elektronischen Elemente eines Antriebssystems einschliesslich der Software beschrieben und ihre Dimensionierungsgrundlagen behandelt. Die Autoren gehen darueber hinaus auf das Engineering, die Zuverlaessigkeit und auf wichtige Aspekte des Lebenszyklus ein. Die Vielzahl der Anwendungen in der Materialfluss- und der Handhabungstechnik, in kontinuierlichen und getakteten Produktionslinien sowie fuer Bearbeitungsprozesse wird in insgesamt zwoelf Antriebsloesungen eingeteilt. Diese umfassen den Motor, den Umrichter mit seiner Software, das Getriebe sowie mechanische Antriebselemente. Es werden die spezifischen Anforderungen und die Funktionalitaet dieser zwoelf Loesungen dargestellt. Dabei konzentrieren sich die Autoren auf die Energieumsetzung mit geregelten elektrischen

  11. Production of robust contours with braze coatings for cylinder head gaskets; Erzeugung konturgenauer Auftragsschichten fuer Zylinderkopfdichtungen

    Energy Technology Data Exchange (ETDEWEB)

    Cierocki, K.; Heilig, M. [Goetze Payen GmbH, Herford (Germany); Koch, J.; Koschlig, M. [Degussa AG, Hanau (Germany)

    1998-12-01

    Multilayer gaskets made of steel for cylinder heads are state of the art at the automotive industry. To simplify the construction by replacing one layer a precise braze coating of the gasket contour was developed (BrazeSkin-Process). The used filler metal consists of a Ni-based filler suspension, which is applied by a serigraphy process. Within this work the development up to now and the potential in the near future are described. (orig.) [Deutsch] In der Automobilindustrie werden auf heutigem Stand der Technik Mehr-Lagen-Dichtungen (MLS) als Zylinderkopf-Dichtung eingesetzt. Hierbei kommen den einzelnen Lagen unterschiedliche Funktionen zu. Die Aufgaben einer Vereinfachung des Aufbaus durch Einsparung einer Lage wurde durch die Erzeugung einer konturgenauen Beschichtung auf einer der Zwischenlagen um die Zylinderbohrung herum geloest. Zur Erzeugung dieser Beschichtung wurde eine Lotsuspension entwickelt, die einer Produktgruppe mit dem Begriff BrazeSkin zugerechnet wird. Diese Lotsuspension besteht aus einem gefuellten Ni-Basis-Lot, das mittels Siebdruck aufgetragen wird. Im Durchlaufofen werden die aufgedruckten Flaechen unter Schutzgas geloetet. Aufgrund der Fuellung mit einem hochschmelzenden Zusatz entsteht im Loetprozess eine Legierung, die gleichermassen die Grundzuege eines Verbundwerkstoffes und eines Reaktionslotes beinhaltet. Hierdurch wird auch die Forderung nach einer mass- und konturgenauen Schichtdicke erfuellt. Der Grad der Serienreife fuer die erste Anwendung wurde jetzt erreicht. Eine Beschreibung der Entwicklung sowie zukuenftige Entwicklungsmoeglichkeiten werden aufgezeigt. (orig.)

  12. Energy supply for the town of the future; Energieversorgung fuer die Stadt der Zukunft

    Energy Technology Data Exchange (ETDEWEB)

    Leithner, R. [ed.

    1998-06-01

    Thanks to the development of new energy systems which combine environmentally benign, heavily insulated buildings with renewable energy sources it is possible today to use energy in a responsible manner. This article presents concepts of urban planning and architecture which make use of integral energy systems, techniques for using renewable energy resources such as solar installations, energy supply through biomass and biogas, and the integration of renewable energy resources such as wind power in municipal supply systems and hydrogen as a clean energy source. Ten papers have been abstracted individually for the Energy Database. [Deutsch] Die Entwicklung neuer Energiesysteme, in denen oekologische, hochwaermegedaemmte Baukonstruktionen mit regenerativen Energiequellen kombiniert werden laesst einen verantwortungsvollen Umgang mit Energie zu. Im Folgenden werden dazu Stadtplanung und Architektur im Kontext integraler Energiekonzepte, Techniken zur Nutzung von regenerativen Energietraegern, wie Solaranlagen, Energiebereitstellung durch Biomasse und Biogas, sowie die Integration von regenerativen Energietraegern, z.B. Windenergienutzung im staedtischen Verbund und Wasserstoff als sauberer Energietraeger vorgestellt. Fuer die Datenbank Energy wurden zehn Beitraege einzeln aufgenommen.

  13. Optimal solutions for traction transformers of modern railway vehicles; Optimale Loesungen fuer Traktionstransformatoren moderner Schienenfahrzeuge

    Energy Technology Data Exchange (ETDEWEB)

    Clement, D. [ABB Secheron AG, Genf (Switzerland); El Hayek, J. [Ingenieurschule Freiburg (Switzerland)

    1998-12-31

    The transformer is a key component in AC railway vehicles. The present paper, written by ABB Secheron Ltd and Engineers School of Fribourg (Switzerland), deals with the different optimization parameters of the transformer itself, as well as a general optimization of a locomotive respectively of an Electrical Multiple Unit (EMU). The results of a special study show the advantages of the use of 2 different windings types, i.e. concentrical layers windings and `pan-cake` discs-windings. This allows the design engineer to have a wide choice of possibilities aiming to find an optimal solution for the customer. (orig.) [Deutsch] Der Transformator ist eine Schluesselkomponente jedes elektrischen Schienfahrzeugs in Wechselstromtechnik. Der vorliegende Aufsatz, der gemeinsam von ABB Secheron AG sowie der Ingenieurschule Freiburg (Schweiz), geschrieben wurde, stellt sowohl die verschiedenen Optimierungsparameter des Transformators vor, als auch die Wichtigkeit der engen Zusammenarbeit mit dem Fahrzeughersteller. Die Ergebnisse einer Spezialstudie zeigen die Vorteile, zwei verschiedene Wicklungstypen verwenden zu koennen: konzentrische Lagenwicklungen oder verschachtelte Scheibenspulenwicklungen. Dies eroeffnet dem Auslegungsingenieur eine grosse Auswahl von Moeglichkeiten, optimale Loesungen fuer den Kunden zu finden. (orig.)

  14. Modern magnetic resonance imaging of the liver; Modernes MR-Protokoll fuer die Leberbildgebung

    Energy Technology Data Exchange (ETDEWEB)

    Hedderich, D.M.; Maintz, D.; Persigehl, T. [Universitaetsklinikum Koeln, Institut fuer Diagnostische und Interventionelle Radiologie, Koeln (Germany); Weiss, K. [Universitaetsklinikum Koeln, Institut fuer Diagnostische und Interventionelle Radiologie, Koeln (Germany); Philips Healthcare Deutschland, Hamburg (Germany)

    2015-12-15

    Magnetic resonance imaging (MRI) of the liver has become an essential tool in the radiological diagnostics of both focal and diffuse diseases of the liver and is subject to constant change due to technological progress. Recently, important improvements could be achieved by innovations regarding MR hardware, sequences and postprocessing methods. The diagnostic spectrum of MRI could be broadened particularly due to new examination sequences, while at the same time scanning time could be shortened and image quality has been improved. The aim of this article is to explain both the technological background and the clinical application of recent MR sequence developments and to present the scope of a modern MRI protocol for the liver. (orig.) [German] Die Magnetresonanztomographie (MRT) der Leber ist in der radiologischen Diagnostik fokaler und diffuser Lebererkrankungen fest etabliert und untersteht einem steten Wandel durch den fortwaehrenden technischen Fortschritt. Durch Neuerungen bei der Hardware, den Sequenzen und der Bildnachverarbeitung konnten in den letzten Jahren deutliche Fortschritte erzielt werden. Insbesondere auf dem Gebiet der Untersuchungssequenzen kam es zu Entwicklungen, die das diagnostische Spektrum der MRT erweiterten, zu einer Verkuerzung der Scanzeit fuehrten und zu einer Verbesserung der Bildqualitaet beitrugen. Gegenstand dieses Artikels ist es, den technischen Hintergrund und die klinische Anwendung neuerer Sequenztechniken zu erklaeren und so die Moeglichkeiten und den Umfang eines modernen MRT-Untersuchungsprotokolls fuer die Leber darzustellen. (orig.)

  15. Multimedia and solar energy - chances for basic and advanced training of tradesmen. Conference; Multimedia und Sonnenenergie - Chancen fuer die Aus-, Fort- und Weiterbildung im Handwerk. Tagung

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2001-07-01

    Subjects: Didactics of vocational training and multimedia learning; Internet services of the Koordinierungsstelle Energie des Westdeutschen Handwerkskammertages; Training in solar engineering at HBZ Muenster; Training software for the space HVAC sector; Interactive learning software for vocational training in solar engineering; E-learning; Multimedia applications in photovoltaics. [German] Die Tagungsunterlagen bestehen aus einzelnen ungebundenen Artikeln. Sie behandeln die folgenden Themen: Didaktik der beruflichen Bildung und multimediales Lernen; Internet Angebot der Koordinierungsstelle Energie des Westdeutschen Handwerkskammertages; Solartechnik-Schulungen am HBZ Muenster; Trainingssoftware fuer das SHK-Handwerk; Einsatz interaktiver Lernsoftware fuer Solarthermie in der beruflichen Bildung; E-Learning; Multimedia-Anwendungen im Bereich Photovoltaik. (AKF)

  16. A monitoring system of radioactive tracers in hydroponic solution for research on plant physiology

    Energy Technology Data Exchange (ETDEWEB)

    Suzui, N.; Kawachi, N.; Ishioka, N.; Fujimaki, S. [Quantum Beam Science Directorate, Japan Atomic Energy Agency, Takasaki, Gunma 370-1292 (Japan); Yamaguchi, M. [Takasaki Advanced Radiation Research Institute, Atomic Energy Agency, Takasaki, Gunma 370-1292 (Japan)

    2009-07-01

    The mechanism of nutrient uptake in plants has received considerable attention in the field of plant science. Here we describe the development of a new monitoring system of radioactive tracers in hydroponic solution, which enables the noninvasive measurement of radioactive tracer uptake by an intact plant. In addition, we incorporated a weighing instrument into this system in order to simultaneously monitor water uptake by the same plant. For an evaluation of this monitoring system, we conducted a tracer experiment with a rice plant and a positron-emitting radioactive tracer, and successfully obtained continuous data for the amounts of radioactive tracer and water taken up by the intact plant over 36 h. (authors)

  17. Application of enriched stable isotopes as tracers in biological systems

    DEFF Research Database (Denmark)

    Stürup, Stefan; Hansen, Helle Rüsz; Gammelgaard, Bente

    2008-01-01

    The application of enriched stable isotopes of minerals and trace elements as tracers in biological systems is a rapidly growing research field that benefits from the many new developments in inorganic mass spectrometric instrumentation, primarily within inductively coupled plasma mass spectrometry...... (ICP-MS) instrumentation, such as reaction/collision cell ICP-MS and multicollector ICP-MS with improved isotope ratio measurement and interference removal capabilities. Adaptation and refinement of radioisotope tracer experiment methodologies for enriched stable isotope experiments......, and the development of new methodologies coupled with more advanced compartmental and mathematical models for the distribution of elements in living organisms has enabled a broader use of enriched stable isotope experiments in the biological sciences. This review discusses the current and future uses of enriched...

  18. In-situ fracture mapping using geotomography and brine tracers

    Energy Technology Data Exchange (ETDEWEB)

    Deadrick, F.J.; Ramirez, A.L.; Lytle, R.J.

    1981-01-01

    The Lawrence Livermore National Laboratory is currently assessing the capabilities of high resolution geophysical methods to characterize geologic sites for the disposal of high level nuclear waste. A successful experiment has recently been performed in which salt water tracers and high frequency electromagnetic waves were utilized to map rock mass fracture zones in-situ. Multiple cross-borehole EM transmissions were used to generate a tomographic image of the fractured rock region between two boreholes. The tomographs obtained correlate well with conventional wireline geophysical logs which can be used to infer the location of fractured zones in the rock mass. This indirect data suggests that the geotomography and brine tracer technique may have merit in mapping fractured zones between boreholes.

  19. FormTracer - A Mathematica Tracing Package Using FORM

    CERN Document Server

    Cyrol, Anton K; Strodthoff, Nils

    2016-01-01

    We present FormTracer, a high-performance, general purpose, easy-to-use Mathematica tracing package which uses FORM. It supports arbitrary space and spinor dimensions as well as an arbitrary number of simple compact Lie groups. While keeping the usability of the Mathematica interface, it relies on the efficiency of FORM. An additional performance gain is achieved by a decomposition algorithm that avoids redundant traces in the product tensors spaces. FormTracer supports a wide range of syntaxes which endows it with a high flexibility. Mathematica notebooks that automatically install the package and guide the user through performing standard traces in space-time, spinor and gauge-group spaces are provided.

  20. A historical perspective on radioisotopic tracers in metabolism and biochemistry.

    Science.gov (United States)

    Lappin, Graham

    2015-01-01

    Radioisotopes are used routinely in the modern laboratory to trace and quantify a myriad of biochemical processes. The technique has a captivating history peppered with groundbreaking science and with more than its share of Nobel Prizes. The discovery of radioactivity at the end of the 19th century paved the way to understanding atomic structure and quickly led to the use of radioisotopes to trace the fate of molecules as they flowed through complex organic life. The 1940s saw the first radiotracer studies using homemade instrumentation and analytical techniques such as paper chromatography. This article follows the history of radioisotopic tracers from meager beginnings, through to the most recent applications. The author hopes that those researchers involved in radioisotopic tracer studies today will pause to remember the origins of the technique and those who pioneered this fascinating science.

  1. A Galaxy-Halo Model for Multiple Cosmological Tracers

    CERN Document Server

    Bull, Philip

    2016-01-01

    The information extracted from large galaxy surveys with the likes of DES, DESI, Euclid, LSST, SKA, and WFIRST will be greatly enhanced if the resultant galaxy catalogues can be cross-correlated with one another. Predicting the nature of the information gain, and developing the tools to realise it, depends on establishing a consistent model of how the galaxies detected by each survey trace the same underlying matter distribution. Existing analytic methods, such as halo occupation distribution (HOD) modelling, are not well-suited for this task, and can suffer from ambiguities and tuning issues when applied to multiple tracers. We construct a simple alternative that provides a common model for the connection between galaxies and dark matter halos across a wide range of wavelengths (and thus tracer populations). This is based on a chain of parametrised statistical distributions that model the connection between (a) halo mass and bulk physical properties of galaxies, such as star-formation rate; and (b) those sam...

  2. ARAC results from phase II of the European tracer experiment

    Energy Technology Data Exchange (ETDEWEB)

    Pace, J.C.; Nasstrom, J.S.

    1997-07-01

    A comparison is provided of the results of calculations by the Atmospheric Release Advisory Capability (ARAC) during two phases of the European Tracer Experiment (ETEX). In phase I of ETEX, participants generated predictions in real time of the concentration of inert tracer gases released from a site in Western France. Each participating group based their predictions on the meteorological data they had available. In phase II, all participants were required to recalculate predictions based on the same meteorological data, which was generated and supplied by the European Centre for Medium- Range Weather Forecasts (ECMWF). ARAC used ECMWF data and also made additional changes to its model configuration,, with the result that ARAC`s accuracy during phase II was much better than for phase I. Experiments described in this paper examine the effect of each of these changes, and show that each change contributed to the improvement.

  3. Artificial sweeteners as potential tracers of municipal landfill leachate.

    Science.gov (United States)

    Roy, James W; Van Stempvoort, Dale R; Bickerton, Greg

    2014-01-01

    Artificial sweeteners are gaining acceptance as tracers of human wastewater in the environment. The 3 artificial sweeteners analyzed in this study were detected in leachate or leachate-impacted groundwater at levels comparable to those of untreated wastewater at 14 of 15 municipal landfill sites tested, including several closed for >50 years. Saccharin was the dominant sweetener in old (pre-1990) landfills, while newer landfills were dominated by saccharin and acesulfame (introduced 2 decades ago; dominant in wastewater). Cyclamate was also detected, but less frequently. A case study at one site illustrates the use of artificial sweeteners to identify a landfill-impacted groundwater plume discharging to a stream. The study results suggest that artificial sweeteners can be useful tracers for current and legacy landfill contamination, with relative abundances of the sweeteners potentially providing diagnostic ability to distinguish different landfills or landfill cells, including crude age-dating, and to distinguish landfill and wastewater sources.

  4. Tracer Methods for Characterizing Fracture Creation in Engineered Geothermal Systems

    Energy Technology Data Exchange (ETDEWEB)

    Rose, Peter [Energy & Geoscience Institute at the University of Utah, Salt Lake City, UT (United States); Harris, Joel [Univ. of Utah, Salt Lake City, UT (United States)

    2014-05-08

    The aim of this proposal is to develop, through novel high-temperature-tracing approaches, three technologies for characterizing fracture creation within Engineered Geothermal Systems (EGS). The objective of a first task is to identify, develop and demonstrate adsorbing tracers for characterizing interwell reservoir-rock surface areas and fracture spacing. The objective of a second task is to develop and demonstrate a methodology for measuring fracture surface areas adjacent to single wells. The objective of a third task is to design, fabricate and test an instrument that makes use of tracers for measuring fluid flow between newly created fractures and wellbores. In one method of deployment, it will be used to identify qualitatively which fractures were activated during a hydraulic stimulation experiment. In a second method of deployment, it will serve to measure quantitatively the rate of fluid flowing from one or more activated fracture during a production test following a hydraulic stimulation.

  5. Evaluation of anthropogenic secondary organic aerosol tracers from aromatic hydrocarbons

    Science.gov (United States)

    Al-Naiema, Ibrahim M.; Stone, Elizabeth A.

    2017-02-01

    Products of secondary organic aerosol (SOA) from aromatic volatile organic compounds (VOCs) - 2,3-dihydroxy-4-oxopentanoic acid, dicarboxylic acids, nitromonoaromatics, and furandiones - were evaluated for their potential to serve as anthropogenic SOA tracers with respect to their (1) ambient concentrations and detectability in PM2.5 in Iowa City, IA, USA; (2) gas-particle partitioning behaviour; and (3) source specificity by way of correlations with primary and secondary source tracers and literature review. A widely used tracer for toluene-derived SOA, 2,3-dihydroxy-4-oxopentanoic acid was only detected in the particle phase (Fp = 1) at low but consistently measurable ambient concentrations (averaging 0.3 ng m-3). Four aromatic dicarboxylic acids were detected at relatively higher concentrations (9.1-34.5 ng m-3), of which phthalic acid was the most abundant. Phthalic acid had a low particle-phase fraction (Fp = 0.26) likely due to quantitation interferences from phthalic anhydride, while 4-methylphthalic acid was predominantly in the particle phase (Fp = 0.82). Phthalic acid and 4-methylphthalic acid were both highly correlated with 2,3-dihydroxy-4-oxopentanoic acid (rs = 0.73, p = 0.003; rs = 0.80, p hydrocarbons; however the substantial partitioning toward the gas phase (Fp ≤ 0.16) and their water sensitivity limit their application as tracers. The outcome of this study is the demonstration that 2,3-dihydroxy-4-oxopentanoic acid, phthalic acid, 4-methylphthalic acid, and 4-hydroxy-3-nitrobenzyl alcohol are good candidates for tracing SOA from aromatic VOCs.

  6. Application of neutron activation tracer sediment technique on environmental science

    Institute of Scientific and Technical Information of China (English)

    YinYi; ZhongWei-Ni; 等

    1997-01-01

    Field and laboratory inverstigations were carried out to study the transport and dispersion law of polluted sediments near wastewater outlet using neutron activation tracer technique.The direction of transport and dispersion of polluted sediments,dispersion amount in different directions,sedimentary region of polluted sediment and evaluation of polluted risk are given.This provided a new test method for the study of environmental science and added a new forecasted content for the evaluation of environmental influence.

  7. nTRACER/COBRA-TF Coupling and Initial Assessment

    Energy Technology Data Exchange (ETDEWEB)

    Lee, Jaejin; Joo, Han Gyu [Seoul National University, Seoul (Korea, Republic of); Perin, Yann; Velkov, Kiril [GRS, Garching (Germany)

    2015-05-15

    The nTRACER direct whole core calculation code being developed at Seoul National University (SNU) has an internal T/H module to determine the temperature and density fields in the reactor. However, this module is based on a quite simplified model and considers only axial flow. The weakness of not-considering radial flow was overcome by coupling the MATRA (Multichannel Analysis for steady-state and Transient in Rod Array) code with nTRACER. MATRA can generate more realistic and detailed T/H field information for nTRACER, but it is a legacy code and does not have an efficient parallel computing capability. On the contrary, the COBRA-TF (Coolant-Boiling in Rod Arrays Two Fluids, CTF) subchannel code, which was developed for the T/H analysis of Light Water Reactor (LWR) vessels, has a good parallel computing capability based on the Message Passing Interface (MPI). The initial assessment of the coupled code demonstrates that more realistic coolant temperatures are obtainable by using CTF. The change in pin power distribution is noted with the realistic flow distribution even though the change is insignificant. The calculation utilizing the boron tracking model of CTF is noticeable. It makes possible for nTRACER to handle nonuniform boron distributions which can be encountered during some transients. Since further validation of the coupling is necessary, the coupling capabilities will be extended to transient applications where non-uniform distributions of inlet parameters such as boron concentration but also coolant temperature can occur.

  8. Design and Fabrication of a Prototype Tracer Surveillance Tester

    Science.gov (United States)

    1983-06-01

    problem with reproducibility and reliability at low spin rates. (6) The existing light sensor assembly and optico - electronic conditioning circuitry...is quite useful to redesign the light sensor assembly/ optico -electronic circuitry so as to obtain quantitative information on the actual intensity...pressurization/depressurization characteristics 31 of the combustion chamber 8a Oscilloscope trace of tracer RPM and light sensor output for 32 30,000

  9. A tracer bolus method for investigating glutamine kinetics in humans.

    Directory of Open Access Journals (Sweden)

    Maiko Mori

    Full Text Available Glutamine transport between tissues is important for the outcome of critically ill patients. Investigation of glutamine kinetics is, therefore, necessary to understand glutamine metabolism in these patients in order to improve future intervention studies. Endogenous glutamine production can be measured by continuous infusion of a glutamine tracer, which necessitates a minimum measurement time period. In order to reduce this problem, we used and validated a tracer bolus injection method. Furthermore, this method was used to measure the glutamine production in healthy volunteers in the post-absorptive state, with extra alanine and with glutamine supplementation and parenteral nutrition. Healthy volunteers received a bolus injection of [1-13C] glutamine, and blood was collected from the radial artery to measure tracer enrichment over 90 minutes. Endogenous rate of appearance (endoRa of glutamine was calculated from the enrichment decay curve and corrected for the extra glutamine supplementation. The glutamine endoRa of healthy volunteers was 6.1±0.9 µmol/kg/min in the post-absorptive state, 6.9±1.0 µmol/kg/min with extra alanyl-glutamine (p = 0.29 versus control, 6.1±0.4 µmol/kg/min with extra alanine only (p = 0.32 versus control, and 7.5±0.9 µmol/kg/min with extra alanyl-glutamine and parenteral nutrition (p = 0.049 versus control. In conclusion, a tracer bolus injection method to measure glutamine endoRa showed good reproducibility and small variation at baseline as well as during parenteral nutrition. Additionally, we showed that parenteral nutrition including alanyl-glutamine increased glutamine endoRa in healthy volunteers, which was not attributable to the alanine part of the dipeptide.

  10. PET and SPET tracers for mapping the cardiac nervous system

    Energy Technology Data Exchange (ETDEWEB)

    Langer, Oliver; Halldin, Christer [Department of Clinical Neuroscience, Psychiatry Section, Karolinska Institute, Karolinska Hospital, 17176 Stockholm (Sweden)

    2002-03-01

    The human cardiac nervous system consists of a sympathetic and a parasympathetic branch with (-)-norepinephrine and acetylcholine as the respective endogenous neurotransmitters. Dysfunction of the cardiac nervous system is implicated in various types of cardiac disease, such as heart failure, myocardial infarction and diabetic autonomic neuropathy. In vivo assessment of the distribution and function of cardiac sympathetic and parasympathetic neurones with positron emission tomography (PET) and single-photon emission tomography (SPET) can be achieved by means of a number of carbon-11-, fluorine-18-, bromine-76- and iodine-123-labelled tracer molecules. Available tracers for mapping sympathetic neurones can be divided into radiolabelled catecholamines, such as 6-[{sup 18}F]fluorodopamine, (-)-6-[{sup 18}F]fluoronorepinephrine and (-)-[{sup 11}C]epinephrine, and radiolabelled catecholamine analogues, such as [{sup 123}I]meta-iodobenzylguanidine, [{sup 11}C]meta-hydroxyephedrine, [{sup 18}F]fluorometaraminol, [{sup 11}C]phenylephrine and meta-[{sup 76}Br]bromobenzylguanidine. Resistance to metabolism by monoamine oxidase and catechol-O-methyl transferase simplifies the myocardial kinetics of the second group. Both groups of compounds are excellent agents for an overall assessment of sympathetic innervation. Biomathematical modelling of tracer kinetics is complicated by the complexity of the steps governing neuronal uptake, retention and release of these agents as well as by their high neuronal affinity, which leads to partial flow dependence of uptake. Mapping of cardiac parasympathetic neurones is limited by a low density and focal distribution pattern of these neurones in myocardium. Available tracers are derivatives of vesamicol, a molecule that binds to a receptor associated with the vesicular acetylcholine transporter. Compounds like (-)-[{sup 18}F]fluoroethoxybenzovesamicol display a high degree of non-specific binding in myocardium which restricts their utility

  11. Thermal tracer tomography: from numerical simulation to field implementation

    Science.gov (United States)

    Somogyvári, Márk; Brauchler, Ralf; Bayer, Peter

    2016-04-01

    Choosing heat for subsurface investigations is attractive because changes in temperature can be easily measured, and natural variations are typically slower than the timescale of the experiments. The tomographical setup expands the applicability of such tests to reconstruct the spatial distribution of hydraulic aquifer properties. A new inversion methodology is presented for thermal tracer tomography, using tracer travel times to invert the hydraulic conductivity distribution of the aquifer. If we can assume that heat transport is driven by advection, the travel time of the thermal tracer can be related to the hydraulic parameters of the aquifer. With this assumption other thermal effects such as thermal diffusion or density driven flow appear as noise in the results. To reduce these effects the early time diagnostics of the recorded breakthrough curves are used, focusing on the fastest transport routes between the sources and receivers. The inverse problem of the experiment thus can be formulated as a classical travel time problem, and it can be solved using standard eikonal solver algorithms known from seismic or hydraulic tomography. The method is demonstrated with a high resolution 3-D aquifer analog dataset. The generated 3-D reconstruction reveals the potential of the method, especially in finding the preferential flow paths within the aquifer. Aside from this, the developed method is computationally efficient and can provide results in a fragment of the time required for full-physics model calibration. The method is also tested under field conditions. Four heat tracer injections were performed during a three day field campaign at the Widen field site in northeast Switzerland. Pulse signals were used and the temperature evolution was measured downstream using a distributed measurement system. The preliminary results of the tomographic inversion correspond well with the findings of earlier studies from the field site imaging the same geological features as

  12. New aspects from legislation, guidelines and safety standards for MRI; Neues aus Gesetzen, Richtlinien und Sicherheitsstandards fuer die MRT

    Energy Technology Data Exchange (ETDEWEB)

    Muehlenweg, M. [Krankenhaus Martha-Maria Halle-Doelau, Institut fuer Radiologie, Halle (Saale) (Germany); Schaefers, G. [MR:comp GmbH, Gelsenkirchen (Germany); Trattnig, S. [Exzellenzzentrum Hochfeld-Magnetresonanz, Medizinische Universitaet Wien, Universitaetsklinik fuer Radiodiagnostik, Wien (Austria)

    2015-08-15

    Betriebsanleitung der MR-Scanner. Die verpflichtenden Inhalte der Betriebsanleitung werden in einer zentralen Norm der International Electrotechnical Commission (IEC) 60601-2-33 geregelt. In dieser Norm wurde juengst die Anwendung statischer Magnetfelder in der MRT bis zu 8 Tesla (T) in der klinischen Routine (kontrollierte Betriebsart 1. Stufe) zugelassen. Die ebenfalls notwendige CE-Zertifizierung der Ultrahochfeldscanner (7-8 T) in Europa ist fuer zukuenftige Geraete zu erwarten. Bestehende Installationen werden nicht automatisch zertifiziert, sondern behalten ihren experimentellen Status. Die aktuelle Erweiterung der IEC 60601-2-33 fuehrt eine neue Zusatzoption, die sog. ''fixed parameter option'' (FPO) ein. Diese Option kann zusaetzlich zu den etablierten Betriebsarten geschaltet werden und definiert eine fixe Geraetekonstellation und bestimmte Parameter des Energieoutputs von MR-Scannern, die zukuenftig die Untersuchungen von Implantatpatienten vereinfachen soll. Die Beschaeftigung schwangerer Mitarbeiterinnen in einer MRT-Einrichtung ist nach wie vor nicht allgemein in Europa geregelt. In Deutschland und Oesterreich wurden 2014 in Teilregionen Beschaeftigungsverbote fuer Schwangere und Stillende im der MR-Kontrollzone (0,5 mT) erteilt. Zugrunde liegt die meist ungeklaerte Frage der Anwendbarkeit von Grenzwerten fuer Beschaeftigte (Extremitaetenexposition fuer statische Magnetfelder bis 8 T erlaubt) oder der Grenzwerte fuer die Allgemeinbevoelkerung (maximal bis 400 mT). Das Verwerfen von Muttermilch nach i.v.-Gabe von gadoliniumhaltigen Kontrastmitteln bei einer stillenden Frau wird laut Gesellschaft fuer urogenitale Radiologie (ESUR) nur noch bei Gabe von Kontrastmitteln der Nephrogenic-systemic-fibrosis(NSF)-Hochrisikoklasse empfohlen. (orig.)

  13. Application of separable parameter space techniques to multi-tracer PET compartment modeling

    Science.gov (United States)

    Zhang, Jeff L.; Morey, A. Michael; Kadrmas, Dan J.

    2016-02-01

    Multi-tracer positron emission tomography (PET) can image two or more tracers in a single scan, characterizing multiple aspects of biological functions to provide new insights into many diseases. The technique uses dynamic imaging, resulting in time-activity curves that contain contributions from each tracer present. The process of separating and recovering separate images and/or imaging measures for each tracer requires the application of kinetic constraints, which are most commonly applied by fitting parallel compartment models for all tracers. Such multi-tracer compartment modeling presents challenging nonlinear fits in multiple dimensions. This work extends separable parameter space kinetic modeling techniques, previously developed for fitting single-tracer compartment models, to fitting multi-tracer compartment models. The multi-tracer compartment model solution equations were reformulated to maximally separate the linear and nonlinear aspects of the fitting problem, and separable least-squares techniques were applied to effectively reduce the dimensionality of the nonlinear fit. The benefits of the approach are then explored through a number of illustrative examples, including characterization of separable parameter space multi-tracer objective functions and demonstration of exhaustive search fits which guarantee the true global minimum to within arbitrary search precision. Iterative gradient-descent algorithms using Levenberg-Marquardt were also tested, demonstrating improved fitting speed and robustness as compared to corresponding fits using conventional model formulations. The proposed technique overcomes many of the challenges in fitting simultaneous multi-tracer PET compartment models.

  14. Radioisotope tracer study in a sludge hygienization research irradiator (SHRI).

    Science.gov (United States)

    Pant, H J; Thýn, J; Zitný, R; Bhatt, B C

    2001-01-01

    A radioisotope tracer study has been carried out in a batch type sludge hygienization research irradiator with flow from top to bottom, the objective being to measure flow rate, circulation and mixing times and to investigate the hydrodynamic behaviour of the irradiator for identifying the cause(s) of malfunction. A stimulus-response technique with NH4(82)Br as a tracer was used to measure the above parameters. Experiments were carried out at three different flow rates, i.e 1.0, 0.64 and 0.33 m3/min. Three combined models based on a set of differential equations are proposed and used to simulate the measured tracer concentration curves. The obtained parameters were used to estimate dead volume and analyse hydrodynamic behaviour of the irradiator. The nonlinear regression problem of model parameter estimation was solved using the Marquardt-Levenberg method. The measured flow rate was found to be in good agreement with the values shown by the flow meter. The circulation times were found to be half of the mixing times. A simple approach for estimation of dose based on a known vertical dose-rate profile inside the irradiator is presented. About one-fourth of the volume of the irradiator was found to be dead at lower flow rates and this decreased with increase in flow rate. At higher flow rates, a semi stagnant volume was found with slow exchange of flow between the active and dead volumes.

  15. Radioisotope tracer study in a sludge hygienization research irradiator (SHRI)

    Energy Technology Data Exchange (ETDEWEB)

    Pant, H.J. E-mail: hjpant@aspsara.barc.ernet.in; Thyn, J.; Zitny, R.; Bhatt, B.C

    2001-01-15

    A radioisotope tracer study has been carried out in a batch type sludge hygienization research irradiator with flow from top to bottom, the objective being to measure flow rate, circulation and mixing times and to investigate the hydrodynamic behaviour of the irradiator for identifying the cause(s) of malfunction. A stimulus-response technique with NH{sup 82}{sub 4}Br as a tracer was used to measure the above parameters. Experiments were carried out at three different flow rates, i.e 1.0, 0.64 and 0.33 m{sup 3}/min. Three combined models based on a set of differential equations are proposed and used to simulate the measured tracer concentration curves. The obtained parameters were used to estimate dead volume and analyse hydrodynamic behaviour of the irradiator. The nonlinear regression problem of model parameter estimation was solved using the Marquardt-Levenberg method. The measured flow rate was found to be in good agreement with the values shown by the flow meter. The circulation times were found to be half of the mixing times. A simple approach for estimation of dose based on a known vertical dose-rate profile inside the irradiator is presented. About one-fourth of the volume of the irradiator was found to be dead at lower flow rates and this decreased with increase in flow rate. At higher flow rates, a semi stagnant volume was found with slow exchange of flow between the active and dead volumes.

  16. Using atmospheric tracers to reduce uncertainty in groundwater recharge areas.

    Science.gov (United States)

    Starn, J Jeffrey; Bagtzoglou, Amvrossios C; Robbins, Gary A

    2010-01-01

    A Monte Carlo-based approach to assess uncertainty in recharge areas shows that incorporation of atmospheric tracer observations (in this case, tritium concentration) and prior information on model parameters leads to more precise predictions of recharge areas. Variance-covariance matrices, from model calibration and calculation of sensitivities, were used to generate parameter sets that account for parameter correlation and uncertainty. Constraining parameter sets to those that met acceptance criteria, which included a standard error criterion, did not appear to bias model results. Although the addition of atmospheric tracer observations and prior information produced similar changes in the extent of predicted recharge areas, prior information had the effect of increasing probabilities within the recharge area to a greater extent than atmospheric tracer observations. Uncertainty in the recharge area propagates into predictions that directly affect water quality, such as land cover in the recharge area associated with a well and the residence time associated with the well. Assessments of well vulnerability that depend on these factors should include an assessment of model parameter uncertainty. A formal simulation of parameter uncertainty can be used to delineate probabilistic recharge areas, and the results can be expressed in ways that can be useful to water-resource managers. Although no one model is the correct model, the results of multiple models can be evaluated in terms of the decision being made and the probability of a given outcome from each model.

  17. Radon as tracer to identify discharge sections at Juatuba basin

    Energy Technology Data Exchange (ETDEWEB)

    Chagas, Claudio Jose; Ferreira, Vinicius Verna Magalhaes; Fonseca, Raquel Luisa Mageste; Rocha, Zildete; Moreira, Rubens Martins; Lemos, Nayron Cosme; Menezes, Angela de Barros Correia, E-mail: vvmf@cdtn.br, E-mail: rlmf@cdtn.br, E-mail: cjc@cdtn.br, E-mail: rochaz@cdtn.br, E-mail: rubens@cdtn.br, E-mail: menezes@cdtn.br, E-mail: lemosnc@cdtn.br [Centro de Desenvolvimento da Tecnologia Nuclear (CDTN/CNEN-MG), Belo Horizonte, MG (Brazil); Santos, Talita Oliveira, E-mail: talitaolsantos@yahoo.com.br [Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG (Brazil). Escola de Engenharia. Departamento de Engenharia Nuclear. Programa de Pos-Graduacao em Ciencias e Tecnicas Nucleares

    2015-07-01

    The use of natural tracers in hydrological studies is a very useful tool, being applied in several studies. One of these tracers is the radon, {sup 222}Rn, noble gas derived from natural sources, been found in all underground waters, as a product of radioactive decay of the {sup 226}Ra. This gas can be found in the air, water, rocks or soil. In this paper, the {sup 222}Rn detection in surface water was used as tracer in order to identify aquifer discharge sections in surface water at the Fundao stream, which belongs to the Juatuba river basin, through the second semester of 2014 and the first semester of 2015, in three sampling campaigns. The {sup 222}Rn measurements at Fundao stream were carried out using the equipment RAD 7. The results showed that {sup 222}Rn is present in some sections of the water course suggesting that there is a connection between groundwater and surface water. It also justifies the variation in the water level in the stream, recorded by a fluviometric station. (author)

  18. A galaxy-halo model for multiple cosmological tracers

    Science.gov (United States)

    Bull, Philip

    2017-10-01

    The information extracted from large galaxy surveys with the likes of DES, DESI, Euclid, LSST, SKA, and WFIRST will be greatly enhanced if the resultant galaxy catalogues can be cross-correlated with one another. Predicting the nature of the information gain, and developing the tools to realize it, depends on establishing a consistent model of how the galaxies detected by each survey trace the same underlying matter distribution. Existing analytic methods, such as halo occupation distribution modelling, are not well suited for this task, and can suffer from ambiguities and tuning issues when applied to multiple tracers. In this paper, we take the first step towards constructing an alternative that provides a common model for the connection between galaxies and dark matter haloes across a wide range of wavelengths (and thus tracer populations). This is based on a chain of parametrized statistical distributions that model the connection between (i) halo mass and bulk physical properties of galaxies, such as star formation rate; and (ii) those same physical properties and a variety of emission processes. The result is a flexible parametric model that allows analytic halo model calculations of one-point functions to be carried out for multiple tracers, as well as providing semi realistic galaxy properties for fast mock catalogue generation.

  19. Consistency Problem with Tracer Advection in the Atmospheric Model GAMIL

    Institute of Scientific and Technical Information of China (English)

    ZHANG Kai; WAN Hui; WANG Bin; ZHANG Meigen

    2008-01-01

    The radon transport test,which is a widely used test case for atmospheric transport models,is carried out to evaluate the tracer advection schemes in the Grid-Point Atmospheric Model of IAP-LASG (GAMIL).TWO of the three available schemes in the model are found to be associated with significant biases in the polar regions and in the upper part of the atmosphere,which implies potentially large errors in the simulation of ozone-like tracers.Theoretical analyses show that inconsistency exists between the advection schemes and the discrete continuity equation in the dynamical core of GAMIL and consequently leads to spurious sources and sinks in the tracer transport equation.The impact of this type of inconsistency is demonstrated by idealized tests and identified as the cause of the aforementioned biases.Other potential effects of this inconsistency are also discussed.Results of this study provide some hints for choosing suitable advection schemes in the GAMIL model.At least for the polar-region-concentrated atmospheric components and the closely correlated chemical species,the Flux-Form Semi-Lagrangian advection scheme produces more reasonable simulations of the large-scale transport processes without significantly increasing the computational expense.

  20. Metal stable isotope signatures as tracers in environmental geochemistry.

    Science.gov (United States)

    Wiederhold, Jan G

    2015-03-03

    The biogeochemical cycling of metals in natural systems is often accompanied by stable isotope fractionation which can now be measured due to recent analytical advances. In consequence, a new research field has emerged over the last two decades, complementing the traditional stable isotope systems (H, C, O, N, S) with many more elements across the periodic table (Li, B, Mg, Si, Cl, Ca, Ti, V, Cr, Fe, Ni, Cu, Zn, Ge, Se, Br, Sr, Mo, Ag, Cd, Sn, Sb, Te, Ba, W, Pt, Hg, Tl, U) which are being explored and potentially applicable as novel geochemical tracers. This review presents the application of metal stable isotopes as source and process tracers in environmental studies, in particular by using mixing and Rayleigh model approaches. The most important concepts of mass-dependent and mass-independent metal stable isotope fractionation are introduced, and the extent of natural isotopic variations for different elements is compared. A particular focus lies on a discussion of processes (redox transformations, complexation, sorption, precipitation, dissolution, evaporation, diffusion, biological cycling) which are able to induce metal stable isotope fractionation in environmental systems. Additionally, the usefulness and limitations of metal stable isotope signatures as tracers in environmental geochemistry are discussed and future perspectives presented.

  1. An investigation of radial tracer flow in naturally fractured reservoirs

    Energy Technology Data Exchange (ETDEWEB)

    Jetzabeth, Ramirez-Sabag; Fernando, Samaniego V.; Jesus, Rivera R.; Fernando Rodriguez

    1991-01-01

    This study presents a general solution for the radial flow of tracers in naturally fractured reservoirs. Continuous and finite step injection of chemical and radioactive tracers are considered. The reservoir is treated as being composed of two regions: a mobile region where longitudinal dispersion and convection take place and a stagnant region where only diffusion and adsorption are allowed. Radioactive decay is considered in both regions. The model of this study is thoroughly compared to those previously presented in literature by Moench and Ogata, Tang et al., Chen et al., and Hsieh et al. The solution is numerically inverted by means of the Crump algorithm. A detailed validation of the model with respect to solutions previously presented and/or simplified physical conditions solutions (i.e., homogeneous case) or limit solutions (i.e., for short times) was carried out. The influence of various dimensionless parameters that enter into the solution was investigated. A discussion of results obtained through the Crump and Stehfest algorithm is presented, concluding that the Crump method provides more reliable tracer concentrations.

  2. Methane emission quantification from landfills using a double tracer approach

    DEFF Research Database (Denmark)

    Scheutz, Charlotte; Samuelsson, J.; Fredenslund, Anders Michael

    2007-01-01

    in the October respectively February measurement. The CH4 emission from the compost area was 0.5 kg CH4 h-1, whereas the carbon dioxide (CO2) flux and nitrous oxide (N2O) was quantified to be in the order of 332 kg CO2 h-1 and 0.06 kg N2O h-1 respectively. The sludge pit located west of the compost material......A tracer method was successfully used for quantification of the whole methane (CH4) emission from Fakse landfill. By using two different tracers the emission from different sections of the landfill could be quantified. Furthermore, is was possible to determine the emissions from local on site...... sources; a composting facility and a sewage sludge storage unit by scaling the tracer method down. Two field campaigns were performed; during October 11-12, 2006 and February 19-20, 2007. At both field campaigns an overall leak search showed that the CH4 emission from the old landfill section...

  3. Lattice-Boltzmann Simulations of Microswimmer-Tracer Interactions

    CERN Document Server

    de Graaf, Joost

    2016-01-01

    Hydrodynamic interactions in systems comprised of self-propelled particles, such as swimming microorganisms, and passive tracers have a significant impact on the tracer dynamics compared to the equivalent "dry" sample. However, such interactions are often difficult to take into account in simulations due to their computational cost. Here, we perform a systematic investigation of swimmer-tracer interaction using an efficient force/counter-force based lattice-Boltzmann (LB) algorithm [J. de Graaf~\\textit{et al.}, J. Chem. Phys.~\\textbf{144}, 134106 (2016)], in order to validate its applicability to study large-scale microswimmer suspensions. We show that the LB algorithm reproduces far-field theoretical results well, both in a system with periodic boundary conditions and in a spherical cavity with no-slip walls, for which we derive expressions here. The LB algorithm has an inherent near-field renormalization of the flow field, due to the force interpolation between the swimmers and the lattice. This strongly pe...

  4. Studies of Tracer Dispersion and Fluid Flow in Porous Media

    Energy Technology Data Exchange (ETDEWEB)

    Rage, T.

    1996-12-31

    This doctoral thesis explores the connection between the topology of a porous medium and its macroscopic transport properties and is based on computerized simulation. In porous media, both diffusion and convection contribute to the dispersion of a tracer and their combined effect is emphasized. The governing equations are solved numerically, using finite differences and Monte Carlo technique. The influence of finite Reynolds number on the outcome of echo-experiments is discussed. Comparing experiments and simulations it is found that nonlinear inertial forces lead to a visible deformation of a returned tracer at surprisingly small Reynolds numbers. In a study of tracer dispersion and fluid flow in periodic arrays of discs it is demonstrated that the mechanisms of mechanical dispersion in periodic media and in natural (non-periodic) porous media are essentially different. Measurements of the percolation probability distribution of a sandstone sample is presented. Local porosity theory predicts that this simple geometric function of a porous medium is of dominant importance for its macroscopic transport properties. It is demonstrated that many aspects of transport through fractures can be studied by using simple but realistic models and readily available computer resources. An example may be the transport of hydrocarbon fluids from the source rock to a reservoir. 165 refs., 44 figs., 1 table

  5. Application of transition metal isotope tracers in global change research

    Institute of Scientific and Technical Information of China (English)

    SONG Jinming; Thomas F. Pedersen

    2005-01-01

    High-precision isotope composition determinations using multicollector, magnetic-sector inductively coupled plasma mass spectrometry (MC-ICPMS) have recently revealed that some transition metal isotopes such as those of Mo, Fe, Cu, Zn etc. can be used as biogeochemical tracers in global change research.The Mo isotope system may be useful in paleoredox investigations indicating that δ 97/95Mo in seawater may co-vary with changes in the relative proportions of anoxic and oxic sedimentation in the ocean, and that this variation may be recorded in δ 97/95Mo of anoxic sediments. The Mo continental flux into the oceans and the global Mo isotope budget can be estimated fromδ 97/95MO values. The Fe isotope composition in seawater is an important issue because Fe plays a controlling role in biological productivity in the oceans and its abundance in seawater may have substantial effect on climate changes. Iron isotope fractionations could result from bio- and abio-processes and have about 0.1% variation (δ 56/54Fe), so Fe isotopes considered alone cannot be used to distinguish the products of abiotic and biotic Fe processing in geological records. Cu and Zn isotopes are also used as biogeochemical tracers, but the researches are relatively less. This review mainly focuses on the methods for preparation, purification and determination of new isotope tracer samples, and on isotope applications in marine environmental changes.

  6. Cosmological constraints from multiple tracers in spectroscopic surveys

    CERN Document Server

    Alarcon, Alex; Gaztañaga, Enrique

    2016-01-01

    We use the Fisher matrix formalism to study the expansion and growth history of the Universe using galaxy clustering with 2D angular cross-correlation tomography in spectroscopic or high resolution photometric redshift surveys. The radial information is contained in the cross correlations between narrow redshift bins. We show how multiple tracers with redshift space distortions cancel sample variance and arbitrarily improve the constraints on the dark energy equation of state $\\omega(z)$ and the growth parameter $\\gamma$ in the noiseless limit. The improvement for multiple tracers quickly increases with the bias difference between the tracers, up to a factor $\\sim4$ in $\\text{FoM}_{\\gamma\\omega}$. We model a magnitude limited survey with realistic density and bias using a conditional luminosity function, finding a factor 1.3-9.0 improvement in $\\text{FoM}_{\\gamma\\omega}$ -- depending on global density -- with a split in a halo mass proxy. Partly overlapping redshift bins improve the constraints in multiple tr...

  7. Entropically induced asymmetric passage times of charged tracers across corrugated channels

    Energy Technology Data Exchange (ETDEWEB)

    Malgaretti, Paolo, E-mail: malgaretti@is.mpg.de [Max-Planck-Institut für Intelligente Systeme, Heisenbergstr. 3, D-70569 Stuttgart (Germany); IV Institut für Theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57, D-70569 Stuttgart (Germany); Department de Fisica Fonamental, Universitat de Barcelona, Barcelona (Spain); Pagonabarraga, Ignacio; Miguel Rubi, J. [Department de Fisica Fonamental, Universitat de Barcelona, Barcelona (Spain)

    2016-01-21

    We analyze the diffusion of charged and neutral tracers suspended in an electrolyte embedded in a channel of varying cross section. Making use of systematic approximations, the diffusion equation governing the motion of tracers is mapped into an effective 1D equation describing the dynamics along the longitudinal axis of the channel where its varying-section is encoded as an effective entropic potential. This simplified approach allows us to characterize tracer diffusion under generic confinement by measuring their mean first passage time (MFPT). In particular, we show that the interplay between geometrical confinement and electrostatic interactions strongly affect the MFTP of tracers across corrugated channels hence leading to alternative means to control tracers translocation across charged pores. Finally, our results show that the MFPTs of a charged tracer in opposite directions along an asymmetric channel may differ We expect our results to be relevant for biological as well synthetic devices whose dynamics is controlled by the detection of diluted tracers.

  8. Entropically induced asymmetric passage times of charged tracers across corrugated channels.

    Science.gov (United States)

    Malgaretti, Paolo; Pagonabarraga, Ignacio; Rubi, J Miguel

    2016-01-21

    We analyze the diffusion of charged and neutral tracers suspended in an electrolyte embedded in a channel of varying cross section. Making use of systematic approximations, the diffusion equation governing the motion of tracers is mapped into an effective 1D equation describing the dynamics along the longitudinal axis of the channel where its varying-section is encoded as an effective entropic potential. This simplified approach allows us to characterize tracer diffusion under generic confinement by measuring their mean first passage time (MFPT). In particular, we show that the interplay between geometrical confinement and electrostatic interactions strongly affect the MFTP of tracers across corrugated channels hence leading to alternative means to control tracers translocation across charged pores. Finally, our results show that the MFPTs of a charged tracer in opposite directions along an asymmetric channel may differ We expect our results to be relevant for biological as well synthetic devices whose dynamics is controlled by the detection of diluted tracers.

  9. In-Situ Characterization of Dense Non-Aqueous Phase Liquids Using Partitioning Tracers

    Energy Technology Data Exchange (ETDEWEB)

    Gary A. Pope; Daene C. McKinney; Akhil Datta Gupta; Richard E. Jackson; Minquan Jin

    2000-03-20

    Majors advances have been made during the past three years in our research on interwell partitioning tracers tests (PITTs). These advances include (1) progress on the inverse problem of how to estimate the three-dimensional distribution of NAPL in aquifers from the tracer data, (2) the first ever partitioning tracer experiments in dual porosity media, (3) the first modeling of partitioning tracers in dual porosity media (4) experiments with complex NAPLs such as coal tar, (5) the development of an accurate and simple method to predict partition coefficients using the equivalent alkane carbon number approach, (6) partitioning tracer experiments in large model aquifers with permeability layers, (7) the first ever analysis of partitioning tracer data to estimate the change in composition of a NAPL before and after remediation (8) the first ever analysis of partitioning tracer data after a field demonstration of surfactant foam to remediate NAPL and (9) experiments at elevated temperatures .

  10. 3. Workshop on measuring instruments for steady and transient multiphase flow; 3. Workshop: Messtechnik fuer stationaere und transiente Mehrphasenstroemungen

    Energy Technology Data Exchange (ETDEWEB)

    Prasser, H.M. [ed.

    1999-12-01

    The emphasis of the conference was on methods of measurement that show spatial distributions of phase fractions and velocity, particle sizes and bubbles of the disperse phase. Among the methods described were 3D X-ray tomography, grid sensor measurement of velocity profiles, and simultaneous measurement of bubble sizes and gas and liquid flow rates using an optical particle tracking method. Also presented were interesting developments in the field of local probes, e.g. an electrodiffusion probe. Another new development was the attempt to use optical tomography for investigations of two-phase flows. [German] Am 14. Oktober 1999 wurde in Rossendorf die dritte Veranstaltung in einer Serie von Workshops ueber Messtechnik fuer stationaere und transiente Mehrphasenstroemungen durchgefuehrt. Dieses Jahr koennen wir auf 11 interessante Vortraege zurueckblicken. Besonders hervorzuheben sind die beiden Hauptvortraege, die von Herrn Professor Hetsroni aus Haifa und Herrn Dr. Sengpiel aus Karlsruhe gehalten wurden. Ihnen und allen anderen Vortragenden moechten wir herzlich fuer ihren Beitrag zum Gelingen des Workshops danken. Erneut lag ein wichtiger Schwerpunkt auf Messverfahren, die raeumliche Verteilungen von Phasenanteilen und Geschwindigkeiten sowie die Groesse von Partikeln bzw. Blasen der dispersen Phase zugaenglich machen. So wurde ueber einen dreidimensional arbeitenden Roentgentomographen, ein Verfahren zur Messung von Geschwindigkeitsprofilen mit Gittersensoren und eine Methode zur simultanen Messung von Blasengroessen sowie Feldern von Gas- und Fluessigkeitsgeschwindigkeit mit einer optischen Partikelverfolgungstechnik vorgetragen. Daneben wurden interessante Entwicklungen auf dem Gebiet der lokalen Sonden vorgestellt, wie z.B. eine Elektrodiffusionssonde. Neue messtechnische Ansaetze waren ebenfalls vertreten; hervorzuheben ist der Versuch, die Methode der optischen Tomographie fuer die Untersuchung von Zweiphasenstroemungen nutzbar zu machen. (orig.)

  11. The superconducting magnet system for the WENDELSTEIN 7-X fusion experiment; Das supraleitende Magnetsystem fuer das Fusionsexperiment WENDELSTEIN 7-X

    Energy Technology Data Exchange (ETDEWEB)

    Sapper, J.

    1995-05-01

    In devices of the TOKAMAK type (JET/Culham, GB, and TFTR/Princeton Laboratory, U.S.A.), successful plasma ignition was achieved, and fusion-induced generation of electricity of some megawatts, for a period of seconds. Experiments of the next generation will tackle the problems of electricity generation sustained over longer periods, for which the STELLARATOR machines are the device of choice, as these, other than the TOKAMAKS, do not require generation of plasma ring currents between 10 and 20 MA. The magnet system in the STELLARATOR devices has to be a superconducting magnet system. At present, bench-scale LT superconductors are available made of materials on the basis of NbTi or Nb{sub 3}Sn, which are applied according to system configuration ( induction at the conductor, current density, temperature, alternating magnetic field load). The paper explains the magnet system intended for use in the planned STELLARATOR WENDELSTEIN 7-X experiments at IPP, Garching. (orig./MM) [Deutsch] In Maschinen des Typs TOKAMAK (JET/Culham, GB und TFTR/Princeton Laboratory, USA) wurde bei den genannten technischen Gegebenheiten die Zuendbedingung erreicht und Fusionsleistung im Megawattbereich fuer einige Sekunden erzeugt. Experimente der naechsten Generation muessen den Dauerbetrieb anstreben, wobei hierfuer Maschinen des Typs STELLARATOR besonders geeignet sind, weil Massnahmen zur Erzeugung eines Plasmaringstromes von 10 bis 20 MA - wie sie fuer TOKAMAKS noetig werden - entfallen koennen. Das Magnetsystem muss - wegen des andernfalls hohen Dauerleistungsbedarfs - supraleitend ausgefuehrt werden. Hierfuer stehen heute im technischen Massstab Niedertemperatursupraleiter auf der Basis von NbTi oder Nb{sub 3}Sn zur Verfuegung, die abhaengig von den geforderten Einsatzbedingungen (Induktion am Leiter, Stromdichte, Temperatur und Wechselfeldbelastung) zum Einsatz gelangen. Im folgenden ist das fuer den geplanten STELLARATOR WENDELSTEIN 7-X (IPP, Garching) vorgesehene Magnetsystem

  12. Pumps for cryogenic liquids with superconducting magnetic bearings. Final report; Pumpen fuer kryogene Fluessigkeiten mit supraleitenden Magnetlagern. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Gerlach, G.; Fuchs, G.; Sorber, J.; Brosche, H.; Richter, M.; Frenzel, C.

    2000-07-01

    A liquid nitrogen pump with contactless superconducting magnetic bearings was to be developed on the basis of an available motor with superconducting bearings. Contactless superconducting magnetic bearings require practically no servicing. A high demand for pumps for cryogenic liquids is expected with the impending use of hydrogen as an energy source. The pumping of liquid nitrogen was demonstrated successfully with the new test aggregate. The maximum pumped volume was 17 l/min at a lift of 0.5 m and 6 l/min at a lift of 1 m. In all, 15 hours of operation were registered in the superconducting state of the bearing, which included 2 hours of uninterrupted pump operation. The higher speed range for which magnetic bearings are optimally suited was not reached. Operation at higher frequencies was impossible either because of stronger resonance amplituees or because the power system was too weak. [German] Ziel des Vorhabens war die Entwicklung einer Pumpe fuer fluessigen Stickstoff mit beruehrungslosen supraleitenden Magnetlagern auf der Basis eines vorhandenen supraleitend gelagerten Motors. Die beruehrungslose supraleitende Magnetlager sind praktisch wartungsfrei. Ein Bedarf an Pumpen fuer kryogene Fluessigkeiten entsteht insbesondere durch den in naher Zukunft zu erwartenden Einsatz von Wasserstoff als Energietraeger. Mit dem entworfenen Aggregat wurde das Pumpen von Fluessigstickstoff erfolgreich demonstriert. Der Foerderstrom betrug bei 0,5m Foerderhoehe maximal 17 l/min; beim 1m Foerderhoehe wurden maximal 6 l/min gemessen. Es wurden insgesamt ca. 15 Betriebsstunden in supraleitenden Zustand des Lagers, darunter 2 Stunden ununterbrochener Pumpbetrieb registriert. Der hoehere Drehzahlbereich, fuer den das Magnetlager eigentlich paedestiniert ist, konnte nicht erreicht werden. Ein Betrieb bei hoeheren (Ist-)Frequenzen war nicht moeglich, entweder durch staerkere Resonanzausschlaege oder durch einen zu schwachen Antrieb. (orig.)

  13. Interpretation of Water Tracer Simulation in the H-1 Segment of the Gullfaks Field

    Energy Technology Data Exchange (ETDEWEB)

    Moid, Farrukh

    2000-07-01

    This thesis describes the water tracer simulation in the H-1 segment of the Gullfaks field. Three passive water tracer slugs were injected from the two producing wells during water flooding, pressure maintenance and reservoir monitoring program in the Gullfaks field. The same program is considered in this thesis. Computer Modelling Group's (CMG) simulator STARS is used for the general reservoir simulation and a separate module for tracer flow (ITRC-SIM) which is incorporated in the STARS and developed at Institute For Energy (IFE) is used for the tracer simulation. Water cut and tracer concentration data are used in history matching of the field. History matching is performed by changing the transmissibility and permeability of different layers; also the effect of changing saturations near the well bore on history matching is examined. It is noted that water cut is sensitive to transmissibility of the layers and the saturation around the well bore. Tracers are found to be moving in the most permeable layers. The corresponding history matching of water and tracer production shows a severe loss of first tracer injected because of imbibition process. Water phase velocity and areal communication between different wells are determined. Advance numerical features of tracer module ITRC-SIM such as flux limiting scheme and grid refinement scheme are evaluated and are found to be an important tool for reducing the numerical smearing. The effects of dispersion and diffusion on tracer response curve are also evaluated. Dispersion makes the tracer concentration curve smeared. Simulation results of water cut and tracer concentration show a good history match for this reservoir. The improved simulation model and the tracer module for this reservoir can be used for the prediction of future performance of the reservoir and interpretation of the tracer behaviour in the reservoir. (author)

  14. Combined use of solar and geothermal energy. Demonstration project for sports centers; Kombinierte Solar- und Geothermienutzung. Demonstrationsprojekt fuer Sportstaetten

    Energy Technology Data Exchange (ETDEWEB)

    Sorg, M. [Metric Mess- und Energiespartechnik GmbH, Ganderkesee (Germany)

    2003-04-01

    A new sports hall at Hessisch Oldendorf in the German state of Niedersachsen demonstrates the consequent application of energy-saving technologies and their good ecological and economic effects. [German] Im Rahmen der Unterstuetzung von Sportprojekten mit besonderer Vorbildfunktion hat der Niedersaechsische Landessportbund den Neubau einer Sporthalle in Hessisch Oldendorf gefoerdert. Der oekologische Modellcharakter der Zweifelder-Halle mit 200 Besucherplaetzen wird vorwiegend durch den konsequenten Einsatz ressourcensparender Technik gepraegt. Mit der Sporthalle wird demonstriert, wie richtungsweisend die angewandten Techniken hinsichtlich ihres oekologischen und wirtschaftlichen Nutzens fuer zukuenftige Bauvorhaben sein koennen. (orig.)

  15. IT solutions for power grid securing. Documentation and power grid information; IT-Loesungen fuer die Leitungssicherung. Dokumentation und Netzauskunft

    Energy Technology Data Exchange (ETDEWEB)

    Hemmersbach, I. [RWE Energy, Essen (Germany); Lechte, M. [SAG Energieversorgungsloesungen GmbH - SAG EL, Frankfurt (Main) (Germany)

    2004-04-05

    The article introduces a specific software (FM-Leisys) for the acquisition, documentation and administration of data for grid securing. The software provides modules for grids (legal aspects), cadastral register data and information on the legal basis for the usage of pieces of real estates. [German] Fuer den Betrieb von ueberregionalen Versorgungsnetzen ist es unumgaenglich, fremde Grundstuecke in Anspruch zu nehmen. Als rechtliche Grundlage sind hierfuer Dienstbarkeiten zu vereinbaren und Vertraege abzuschliessen. In grossen Netzen stellt die kombinierte Speicherung von Liegenschafts-, Grundbuch- und Netzdaten hohe Anforderungen an die Informationstechnik zur Bewaeltigung der taeglich anfallenden Aufgaben. Sehr gut realisieren laesst sich all dies mit dem Leitungssicherungssystem FM-Leisys. (orig.)

  16. Zero-leakage shut-off butterflies for high-temperature applications; Dichtschliessende Absperrklappen fuer die Hochtemperaturtechnik

    Energy Technology Data Exchange (ETDEWEB)

    Meier, N. [Krombach Armaturen, Kreuztal (Germany)

    2000-03-01

    Over many years, zero-leakage butterfly valves have eminently proven their capabilities in a large range of elevated-temperature and elevated-pressure processes. This article examines the basic design differences between various butterfly valves. These differences are, among other factors, important indicators of the suitability of the various valve types for their use in industry. (orig.) [German] Dichtschliessende Absperrklappen haben sich ueber Jahre in vielen Prozessen, die unter hoeherem Druck und hoeherer Temperatur ablaufen, bestens bewaehrt. Der Beitrag zeigt die grundsaetzlichen konstruktiven Unterschiede dichtschliessender Absperrklappen. Diese Unterschiede sind unter anderem Indikatoren fuer die Prozesstauglichkeit von Absperrklappen in der Industrie. (orig.)

  17. Requirements on air pollution measurements for studies in environmental medicine.; Anforderungen an lufthygienische Messungen fuer umweltmedizinische Untersuchungen

    Energy Technology Data Exchange (ETDEWEB)

    Jakobi, G. [Muenchen Univ., Freising (Germany). Lehrstuhl fuer Bioklimatologie und Immissionsforschung

    1999-07-01

    Air pollution data used for interpreting studies in environmental medicine are often, if at all, an insufficient indicator of actual pollutant intake. This is because air pollution measurements are extremely expensive and data needed for studies are therefore often taken from available monitoring networks, which however, have been designed for a completely different purpose. A particularly crucial source of error is to be seen in the practice of dissociating the place where the measurement was performed from the place of exposure of the study population, i.e. unless there is a reason why the chemical composition of the atmosphere should be homogeneous. The measured concentration of air pollutants at a given place is to a large extent determined by topographic, orographic and meteorological factors, the elevation of the sampling point as well as by the specific structure of the surroundings and the distance to relevant emission sources such as road traffic. In addition to considering the sampling point's representativeness of the exposure conditions to which the study population is subjected there is also a need to improve current methods of estimating pollutant dosage as well as to take account of the time during which subjects are indoors. Indoor and outdoor pollutant concentrations and spectra can differ substantially. A further influencing factor is to be seen in the time resolution of measured data. Whereas daily and monthly mean values may be sufficient for estimating exposure parameters relevant to chronic effects, studies on acute effects will generally require a higher time resolution. [German] Lufthygienische Daten, die zur Interpretation umweltmedizinischer Untersuchungen herangezogen werden, spiegeln die tatsaechlich aufgenommene Schadstoffdosis oft nur unzureichend oder gar nicht wider. Dies gilt, da Luftschadstoffmessungen sehr teuer sind und die lufthygienischen Daten deshalb oft verfuegbaren Messnetzen entnommen werden, die jedoch fuer andere

  18. Optimization of environment compatible analysis methods for mineral hydrocarbons in the soil; Optimierung umweltvertraeglicher Analysenverfahren fuer Mineraloelkohlenwasserstoffe im Boden

    Energy Technology Data Exchange (ETDEWEB)

    Flachowsky, J.; Borsdorf, H. [eds.] [UFZ - Umweltforschungszentrum Leipzig-Halle GmbH, Leipzig (Germany); Loehmannsroeben, H.G.; Roch, T. [Erlangen-Nuernberg Univ., Erlangen (Germany); Leopom, P. [Umweltbundesamt, Berlin (Germany); Reimers, C. [Technische Univ. Hamburg-Harburg, Hamburg (Germany); Matz, G.; Kuebler, J. [MOBILAB GmbH, Hamburg (Germany); Christall, B. [SOFIA GmbH, Berlin (Germany); Hahn, M.; Matschiner, H. [Elektrochemie Halle GmbH (Germany); Baermann, A. [Dr. Baermann und Partner Mikroanalytik, Hamburg (Germany)

    1997-12-31

    This paper describes several analytical methods for the quantitative chemical analysis of mineral oil hydrocarbons in soils. The measuring methods are investigated on accuracy, errors, sample preparation methods, analysis of reference materials and real materials. (SR) [Deutsch] Mit dieser Schrift praesentiert die Deutsche Bundesstiftung Umwelt der Oeffentlichkeit Ergebnisse zu alternativen umweltvertraeglichen Bestimmungsmethoden fuer Mineraloelkohlenwasserstoffe in Boeden. Es war in erster Linie das Ziel aller beteiligten Forscher und Entwickler, die heute noch in der Anwendung befindliche Vorschrift nach DIN 38409 H18 zur Analytik von Mineraloelkohlenwasserstoffen durch eine sowohl umweltfreundliche als auch insgesamt aussagekraeftige Methode zu substituieren. (orig.)

  19. Estimation of Fluorescent Dye Amount in Tracer Dye Test

    Science.gov (United States)

    Pekkan, Emrah; Balkan, Erman; Balkan, Emir

    2015-04-01

    Karstic groundwater is more influenced by human than the groundwater that disperse in pores. On the other hand karstic groundwater resources, in addition to providing agricultural needs, livestock breeding, drinking and domestic water in most of the months of the year, they also supply drinking water to the wild life at high altitudes. Therefore sustainability and hydrogeological investigation of karstic resources is critical. Tracing techniques are widely used in hydrologic and hydrogeologic studies to determine water storage, flow rate, direction and protection area of groundwater resources. Karanfil Mountain (2800 m), located in Adana, Turkey, is one of the karstic recharge areas of the natural springs spread around its periphery. During explorations of the caves of Karanfil mountain, a 600 m deep cave was found by the Turkish and Polish cavers. At the bottom of the cave there is an underground river with a flow rate of approximately 0.5 m3/s during August 2014. The main spring is located 8 km far from the cave's entrance and its mean flow rate changes between 3.4 m3/s and 0.21 m3/s in March and September respectively according to a flowrate observation station of Directorate of Water Works of Turkey. As such frequent storms, snowmelt and normal seasonal variations in rainfall have a significant and rapid effect on the volume of this main spring resource. The objective of our research is to determine and estimate dye amount before its application on the field inspired from the previously literature on the subject. This estimation is intended to provide a preliminary application of a tracer test of a karstic system. In this study dye injection, inlet point will be an underground river located inside the cave and the observation station will be the spring that is approximately 8 km far from the cave entrance. On the other hand there is 600 meter elevation difference between cave entrance and outlet spring. In this test Rodamin-WT will be used as tracer and the

  20. A comparison of resting images from two myocardial perfusion tracers

    Energy Technology Data Exchange (ETDEWEB)

    Anagnostopoulos, C. [Royal Brompton Hospital, London (United Kingdom); Laney, R. [Royal Brompton Hospital, London (United Kingdom); Pennell, D. [National Heart and Lung Inst., London (United Kingdom); Proukakis, H. [University of Athens Medical School (Greece); Underwood, R. [National Heart and Lung Inst., London (United Kingdom)

    1995-09-01

    We have compared stress-redistribution and delayed rest thallium-201 with rest technetium-99m methoxyisobutylisonitrile (MIBI) tomograms in order to compare the tracers for the assessment of myocardial viability and to validate a rapid protocol combining the two tracers. We studied 30 consecutive patients with known or suspected coronary artery disease [group 1: 16 with normal left ventricular function, mean left ventricular ejection fraction (LVEF) 55%, SD 6%; group 2: 14 with abnormal function, mean LVEF 28%, SD 8%]. {sup 201}Tl was injected during infusion of adenosine followed by acquisition of conventional stress and redistribution tomograms. On a separate day, {sup 201}Tl was injected at rest with imaging 4 h later. {sup 99m}Tc-MIBI was then given at rest and imaging was performed. Three images were compared: redistribution {sup 201}Tl, rest {sup 201}Tl, and rest {sup 99m}Tc-MIBI. Tracer activity was classified visually and quantitatively in nine segments and segments with>50% activity were defined as containing clinically significant viable myocardium. Mean global tracer uptake as a percentage of maximum was similar in group 1 (rest {sup 201}Tl 69%{+-}12%, redistribution {sup 201}Tl 69%{+-}15%, rest {sup 99m}Tc-MIBI 70%{+-}13%), but in group 2 mean tracer uptake was significantly greater in the rest {sup 201}Tl images (59%{+-}16%) than in redistribution {sup 201}Tl images (53%{+-}17%) or rest {sup 99m}Tc-MIBI images (53%{+-}19%). Overall agreement for regional uptake score was excellent ({kappa} from 0.79 to 0.84), although there were a significant number of segments with less uptake shown by redistribution {sup 201}Tl and by rest {sup 99m}Tc-MIBI than by rest {sup 201}Tl in group 2. The number of segments with significant viable myocardium in group 1 was very similar between the three images but in group 2 rest {sup 201}Tl identified significantly more segments as viable than the other images. (orig./MG) (orig.). With 1 fig., 7 tabs.

  1. MULTISPECIES REACTIVE TRACER TEST IN A SAND AND GRAVEL AQUIFER, CAPE COD, MASSACHUSETTS: PART 2: TRANSPORT OF CHROMIUM (VI) AND LEAD-, COPPER-, AND ZINC-EDTA TRACERS

    Science.gov (United States)

    This report discusses the transport of a group of reactive tracers over the course of a large-scale, natural gradient tracer test conducted at the USGS Cape Cod Toxic Substances Hydrology Research site, near Falmouth, Massachusetts. The overall objectives of the experiment were ...

  2. The new Porsche Cayenne V8-Engines; Die neuen V8-Motoren fuer den Porsche Cayenne

    Energy Technology Data Exchange (ETDEWEB)

    Knirsch, S.; Kerkau, M.; Wasserbaech, T.; Neusser, H.J.; Porsche, F. [AG, Weissach (Germany)

    2003-07-01

    With the completely newly conceived V8 engines for the Porsche Cayenne, it has been proved possible to realize the numerous demanding requirements of a modern engine concept for a sport utility vehicle (SUV) in convincing fashion. Values typical of Porsche, such as high engine power, revolving ability and agile response in combination with high engine torque at low engine speeds provide the Porsche Cayenne with superior performance in the SUV segment. At the same time, specific parameters such as for example, the power output of 55.4 kW/l for the V8 normally aspirated engine, and 73.4 kW/l for the bi-turbocharged V8, an outstanding mean pressure of 11.4 bar at 2000 rpm and a fuel consumption of 359 g/kWh (normally aspirated engine) and 375 g/kWh (bi-turbocharged engine) at 2000 rpm and a p{sub me} of 2 bar underline the successful concept of the new V8 engines. In addition, the engines possess excellent off-road capabilities, allowing uphill and downhill gradients and lateral inclinations of up to 45 to be mastered. Further characteristics are a high overall rigidity of the basic engine structure and low engine noise levels, obviating the need for additional sound-absorbing measures such as, for example, large-area engine covers. The engine configurations of both the Cayenne S and the Cayenne Turbo are the same for all markets worldwide. (orig.) [German] Mit den vollstaendig neu konzipierten V8-Motoren fuer den Porsche Cayenne ist es gelungen, die vielfaeltigen und anspruchsvollen Anforderungen an ein modernes Motorkonzept fuer ein sportliches Mehrzweckfahrzeug in ueberzeugender Weise umzusetzen. Die Porsche-typischen Werte wie hohe Motorleistung, Drehfreude und agiles Ansprechverhalten in Kombination mit einem hohen Motordrehmoment bei niedrigen Drehzahlen verhelfen dem Porsche Cayenne zu ueberlegenen Fahrleistungen im Segment der sportlichen Mehrzweckfahrzeuge. Gleichzeitig unterstreichen spezifische Kennwerte wie eine Leistung von 55,4 kW/l beim V8-Saugmotor

  3. Effects of crude oil on water and tracer movement in the unsaturated and saturated zones

    Science.gov (United States)

    Delin, Geoffrey N.; Herkelrath, William N.

    2017-05-01

    A tracer test was conducted to aid in the investigation of water movement and solute transport at a crude-oil spill site near Bemidji, Minnesota. Time of travel was measured using breakthrough curves for rhodamine WT and bromide tracers moving from the soil surface through oil-contaminated and oil-free unsaturated zones to the saturated zone. Results indicate that the rates of tracer movement were similar in the oil-free unsaturated and saturated zones compared to the oily zones. These results are somewhat surprising given the oil contamination in the unsaturated and saturated zones. Rhodamine tracer breakthrough in the unsaturated and saturated zones in general was delayed in comparison to bromide tracer breakthrough. Peak tracer concentrations for the lysimeters and wells in the oily zone were much greater than at the corresponding depths in the oil-free zone. Water and tracer movement in the oily zone was complicated by soil hydrophobicity and decreased oil saturations toward the periphery of the oil. Preferential flow resulted in reduced tracer interaction with the soil, adsorption, and dispersion and faster tracer movement in the oily zone than expected. Tracers were freely transported through the oily zone to the water table. Recharge calculations support the idea that the oil does not substantially affect recharge in the oily zone. This is an important result indicating that previous model-based assumptions of decreased recharge beneath the oil were incorrect. Results have important implications for modeling the fate and transport of dissolved contaminants at hydrocarbon spill sites.

  4. Development of Models to Simulate Tracer Tests for Characterization of Enhanced Geothermal Systems

    Energy Technology Data Exchange (ETDEWEB)

    Williams, Mark D.; Reimus, Paul; Vermeul, Vincent R.; Rose, Peter; Dean, Cynthia A.; Watson, Tom B.; Newell, D.; Leecaster, Kevin; Brauser, Eric

    2013-05-01

    A recent report found that power and heat produced from enhanced (or engineered) geothermal systems (EGSs) could have a major impact on the U.S energy production capability while having a minimal impact on the environment. EGS resources differ from high-grade hydrothermal resources in that they lack sufficient temperature distribution, permeability/porosity, fluid saturation, or recharge of reservoir fluids. Therefore, quantitative characterization of temperature distributions and the surface area available for heat transfer in EGS is necessary for the design and commercial development of the geothermal energy of a potential EGS site. The goal of this project is to provide integrated tracer and tracer interpretation tools to facilitate this characterization. This project was initially focused on tracer development with the application of perfluorinated tracer (PFT) compounds, non-reactive tracers used in numerous applications from atmospheric transport to underground leak detection, to geothermal systems, and evaluation of encapsulated PFTs that would release tracers at targeted reservoir temperatures. After the 2011 midyear review and subsequent discussions with the U.S. Department of Energy Geothermal Technology Program (GTP), emphasis was shifted to interpretive tool development, testing, and validation. Subsurface modeling capabilities are an important component of this project for both the design of suitable tracers and the interpretation of data from in situ tracer tests, be they single- or multi-well tests. The purpose of this report is to describe the results of the tracer and model development for simulating and conducting tracer tests for characterizing EGS parameters.

  5. Journal: A Review of Some Tracer-Test Design Equations for ...

    Science.gov (United States)

    Determination of necessary tracer mass, initial sample-collection time, and subsequent sample-collection frequency are the three most difficult aspects to estimate for a proposed tracer test prior to conducting the tracer test. To facilitate tracer-mass estimation, 33 mass-estimation equations are reviewed here, 32 of which were evaluated using previously published tracer-test design examination parameters. Comparison of the results produced a wide range of estimated tracer mass, but no means is available by which one equation may be reasonably selected over the others. Each equation produces a simple approximation for tracer mass. Most of the equations are based primarily on estimates or measurements of discharge, transport distance, and suspected transport times. Although the basic field parameters commonly employed are appropriate for estimating tracer mass, the 33 equations are problematic in that they were all probably based on the original developers' experience in a particular field area and not necessarily on measured hydraulic parameters or solute-transport theory. Suggested sampling frequencies are typically based primarily on probable transport distance, but with little regard to expected travel times. This too is problematic in that tends to result in false negatives or data aliasing. Simulations from the recently developed efficient hydrologic tracer-test design methodology (EHTD) were compared with those obtained from 32 of the 33 published tracer-

  6. Ethical codes. Fig leaf argument, ballast or cultural element for radiation protection?; Ethik-Codes. Feigenblatt, Ballast oder Kulturelement fuer den Strahlenschutz?

    Energy Technology Data Exchange (ETDEWEB)

    Gellermann, Rainer [Nuclear Control and Consulting GmbH, Braunschweig (Germany)

    2014-07-01

    The international association for radiation protection (IRPA) adopted in May 2004 a Code of Ethics in order to allow their members to hold an adequate professional level of ethical line of action. Based on this code of ethics the professional body of radiation protection (Fachverband fuer Strahlenschutz) has developed its own ethical code and adopted in 2005.

  7. Modular cogeneration power plants for the local heat distribution system of the school and sports center of Meckenheim; BHKW mit Nahwaermenetz fuer das Schul- und Sportzentrum in Meckenheim

    Energy Technology Data Exchange (ETDEWEB)

    Schaab, R.; Bergmann, A.

    1998-07-01

    The paper describes the municipal project from the planning stage through to technical design, dimensioning, and comissioning. The authors present and explain the operating results after an operating period of three years, referring among others to overall plant availability and individual aspects such as failure of single systems, and a 12-month operating report of the modular cogeneration plants (CHP) covering well 4 650 hours of operation. (orig./CB) [German] In einem durch die Stadt Meckenheim 1992 in Auftrag gegebenen 'Energieversorgungskonzept fuer das Schul- und Sportzentrum Meckenheim' wurde die Beheizungsstruktur des Schul- und Sportzentrums analysiert und Konzepte fuer eine Energieversorgung ueber erdgasbefeuerte Anlagen technisch-wirtschaftlich untersucht. Nach Vorstellung, Erlaeuterung und Genehmigung des gesamten Nahwaermekonzepts mit BHKW in den zustaendigen Gremien der Stadt Meckenheim wurde mit der planerischen Durcharbeitung im Maerz 1993 begonnen. Fuer die Anlagen der Nahwaermeversorgung ergibt sich zwischenzeitlich eine Gesamtbetriebszeit von rund drei Jahren. Die bisherigen Betriebsergebnisse lassen jedoch keinen Zweifel an der Erfuellung der vorgegebenen Ziele. Die Vefuegbarkeit der Anlagen ist sehr hoch; Ausfaelle einzelner Bereiche fuehrten zu keiner Einschraenkung der Versorgungsaufgabe. Die Ausfuehrungen und Darstellungen des Beitrags beziehen sich auf ein vollstaendiges Betriebsjahr der BHKW-Anlage (Januar 1997 bis Dezember 1997). In diesem Zeitraum ergaben sich fuer die BHKW-Module jeweils rund 4.650 Betriebsstunden. (orig./RHM)

  8. Double-layer capacitors as dynamic stores for PV applications. Final report; Doppelschichtkondensatoren als dynamische Speicher fuer PV-Anwendungen. Abschlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Willer, B.; Knorr, R.; Broeker, C.; Burger, B.; Wollny, M.

    1999-07-01

    Double layer capacitors are the system of choice whenever a large number of cycles and high capacity are required. They have the advantages of high cyclic strength, high capacity, freedom of servicing, insensitivity to high temperatures and long life. Drawbacks are low energy density, high self-discharge and high cost.Applications in water pumps, pathfinders and roller blind control systems were investigated. [German] Mit den Ergebnissen steht ein detailliertes Wissen ueber den weltweiten Entwicklungsstand und die physikalischen Eigenschaften von Doppelschichtkondensatoren zur Verfuegung. Ihre Eigenschaften wurden in Bezug auf moegliche photovoltaische Anwendungen hin analysiert. Anwendungsfehlder ergeben sich vorzugsweise dann, wenn hohe Zyklenzahl und Leistungsfaehigkeit gefordert werden. Die Vorteile des neuen Energiespeichers sind seine hohe Zyklenfestigkeit und Leistungsfaehigkeit, seine Wartungsfreiheit, Temperaturunempfindlichkeit und lange Lebensdauer. Ihnen stehen die Nachteile einer geringen Energiedichte, hohen Selbstentladung und hoher Kosten gegenueber. Eine deutliche Steigerung der Gesamteffizienz von photovoltaischen Versorgungseinheiten beim Einsatz von Doppelschichtkondensatoren ergeben energetische Simulationen unterschiedlicher Systeme. Fuer ausgewaehlte photovoltaisch versorgte Anwendungen konnte die Einsatzfaehigkeit von Doppelschichtkondensatoren in Feldtests erprobt und nachgewiesen werden. Wasserpumpensysteme, Pathfinders und eine Rolladensteuerung fuer ein Fenster wurden getestet. Der Einsatz von Doppelschichtkondensatoren zur weiteren Verbreitung photovoltaischer Anwendungen ist bereits heute fuer spezielle Anwendungen sinnvoll und wirtschaftlich. Mit weiter fallenden Preisen fuer die Kondensatoren und der Entwicklung von Kondensatorsystemen mit hoeheren Spannungen werden weitere Anwendungsfelder hinzukommen. Die Basis zur Entwicklung der notwendigen Systemtechnik und ihrer Demonstration in Feldversuchen ist durch die Ergebnisse des

  9. Duotrans for the local traffic. EBF-part of the project. Final report; Zweiwegefahrzeug Strasse/Schiene fuer den OePNV. Teilprojekt EBF - Rahmenbedingungen, Anwendungen, Machbarkeiten. Schlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Kunze, M.; Schantroch, E.

    2001-03-01

    The submitted feasibility study furnished the proof that a 'two-way vehicle' (duotrans) for the application on road and rail for the local traffic is suitable and innovative alignment enabled. On the basis of sample applications the management was checked up to the local classification of the drive change places. Selected applications were evaluated regarding their economy. As an obstacle the rail use fees were put out. Outgoing from the obtained result conclusions for resuming steps were suggested. As summary it can be stated that a number of applications, sufficient for the system application, exists. (orig.) [German] Die vorgelegte Machbarkeitsstudie hat den Nachweis erbracht, dass ein Zweiwegefahrzeug (Duotrans) fuer den Einsatz auf Strasse und Schiene fuer den OePNV geeignet ist und innovative Linienfuehrungen ermoeglicht. An Hand von Anwendungsbeispielen wurde die Betriebsdurchfuehrung bis hin zur standoertlichen Einordnung der Fahrwegwechselstellen geprueft. Ausgewaehlte Anwendungsfaelle wurden hinsichtlich ihrer Wirtschaftlichkeit bewertet. Als ein Hemmnis wurden die Schienennutzungsgebuehren herausgestellt. Ausgehend vom erzielten Ergebnis wurden Schlussfolgerungen fuer weiterfuehrende Schritte vorgeschlagen. Als Resuemee kann festgestellt werden, dass eine fuer den Systemeinsatz ausreichende Anzahl von Anwendungsfaellen existiert. (orig.)

  10. Cashless prepayment systems - solution for problems of energy supplying companies with not paying customers?; Vorkassensysteme - Loesung fuer das Problem der insolventen Kunden bei Energieversorgungsunternehmen?

    Energy Technology Data Exchange (ETDEWEB)

    Winterbauer, G. [Vertrieb HTS Elektronik GmbH, Epfenbach (Germany)

    1997-10-20

    The author wants to demonstrate, that cashless prepayment systems could possibly solve the rapidly increasing problem of energy supplying companies with loss of demands. (orig.) [Deutsch] Der Verfasser versucht aufzuzeigen, dass elektronische Vorkassensysteme durchaus als Loesung fuer das staendig zunehmende Problem von Zahlungsausfaellen bei Energieversorgungsunternehmen verwendet werden koennen. (orig.)

  11. No rival for Thomas Alva Edison. Light deflection systems are gaining ground in Germany; (Keine) Konkurrenz fuer Thomas Alva Edison. Lichtleitsysteme gewinnen auch in Deutschland immer mehr Liebhaber

    Energy Technology Data Exchange (ETDEWEB)

    Horbelt, A.

    2002-02-01

    Increasingly, German builder-owners are getting interested in light deflection systems that ensure daylighting in all parts of buildings. [German] Immer mehr Hausbesitzer interessieren sich fuer Lichtleitsysteme, um auch in die entlegensten Ecken des Gebaeudes noch Tageslicht zu bekommen. (orig.)

  12. Marine environment protection of the North Sea and Baltic Sea. Special report - February 2004; Meeresumweltschutz fuer Nord- und Ostsee. Sondergutachten - Februar 2004

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2004-07-01

    The marine environment of the North Sea and Baltic Sea is still heavily polluted. The marine ecosystems are under severe stress from overfishing, water pollution, raw materials production and tourism. Environmental protection in this region necessitates decisive political initiatives and strict corrections especially in fishery policy, agricultural policy and chemical substances control. This is the balance of the special expert opinion of the Council of Environmental Experts. The publication specifies the main problem areas, the current pollution situation, the fields where action is most urgently required - especially in fishery, chemical substances, agricultural and sea travel policies - and presents suggestions for an integrated European and national marine protection policy including a regional development concept for the marine environment. (orig.) [German] Die Meeresumwelt von Nord- und Ostsee ist nach wie vor stark belastet. Ueberfischung, Schadstoffeintraege und Ueberduengung sowie die intensive Nutzung durch Schifffahrt, Rohstoffabbau und Tourismus beeintraechtigen vielfach massiv die marinen Oekosysteme. Ein wirksamer Meeresumweltschutz erfordert daher einschneidende politische Initiativen und grundlegende Korrekturen insbesondere in der Fischereipolitik, der Agrarpolitik und bei der Chemikalienregulierung. Diese Bilanz zieht der Rat von Sachverstaendigen fuer Umweltfragen in seinem aktuellen Sondergutachten 'Meeresumweltschutz fuer Nord- und Ostsee'. Das Sondergutachen - gibt einen Ueberblick ueber die wichtigsten Problemfelder und die aktuelle Belastungslage, - zeigt den wesentlichen Handlungsbedarf auf, insbesondere fuer die Fischerei-, Chemikalien-, Agrar- und Schifffahrtspolitik und - entwickelt Vorschlaege fuer eine integrierte europaeische und nationale Meeresschutzpolitik einschliesslich einer Merresraumordnung. (orig.)

  13. Technical Note: Coupling of chemical processes with the Modular Earth Submodel System (MESSy submodel TRACER

    Directory of Open Access Journals (Sweden)

    P. Jöckel

    2007-11-01

    Full Text Available The implementation of processes related to chemistry into Earth System Models and their coupling within such systems requires the consistent description of the chemical species involved. We provide a tool (written in Fortran95 to structure and manage information about constituents, herein after referred to as tracers, namely the Modular Earth Submodel System (MESSy generic (i.e., infrastructure submodel TRACER. With TRACER it is possible to define a multitude of tracer sets, depending on the spatio-temporal representation (i.e., the grid structure of the model. The required information about a specific chemical species is split into the static meta-information about the characteristics of the species, and its (generally in time and space variable abundance in the corresponding representation. TRACER moreover includes two submodels. One is TRACER_FAMILY, an implementation of the tracer family concept. It distinguishes between two types: type-1 families are usually applied to handle strongly related tracers (e.g., fast equilibrating species for a specific process (e.g., advection. In contrast to this, type-2 families are applied for tagging techniques, in which specific species are artificially decomposed and associated with additional information, in order to conserve the linear relationship between the family and its members. The second submodel is TRACER_PDEF, which corrects and budgets numerical negative overshoots that arise in many process implementations due to the numerical limitations (limited precision, rounding errors. The submodel therefore guarantees the positive definiteness of the tracers and stabilises the integration scheme. As a by-product, it further provides a global tracer mass diagnostic. Last but not least, we present the submodel PTRAC for the definition of prognostic tracers via a Fortran95 namelist. TRACER with its submodels and PTRAC can readily be applied to a variety of models without further requirements. The code and

  14. A tracer-based inversion method for diagnosing eddy-induced diffusivity and advection

    Science.gov (United States)

    Bachman, S. D.; Fox-Kemper, B.; Bryan, F. O.

    2015-02-01

    A diagnosis method is presented which inverts a set of tracer flux statistics into an eddy-induced transport intended to apply for all tracers. The underlying assumption is that a linear flux-gradient relationship describes eddy-induced tracer transport, but a full tensor coefficient is assumed rather than a scalar coefficient which allows for down-gradient and skew transports. Thus, Lagrangian advection and anisotropic diffusion not necessarily aligned with the tracer gradient can be diagnosed. In this method, multiple passive tracers are initialized in an eddy-resolving flow simulation. Their spatially-averaged gradients form a matrix, where the gradient of each tracer is assumed to satisfy an identical flux-gradient relationship. The resulting linear system, which is overdetermined when using more than three tracers, is then solved to obtain an eddy transport tensor R which describes the eddy advection (antisymmetric part of R) and potentially anisotropic diffusion (symmetric part of R) in terms of coarse-grained variables. The mathematical basis for this inversion method is presented here, along with practical guidelines for its implementation. We present recommendations for initialization of the passive tracers, maintaining the required misalignment of the tracer gradients, correcting for nonconservative effects, and quantifying the error in the diagnosed transport tensor. A method is proposed to find unique, tracer-independent, distinct rotational and divergent Lagrangian transport operators, but the results indicate that these operators are not meaningfully relatable to tracer-independent eddy advection or diffusion. With the optimal method of diagnosis, the diagnosed transport tensor is capable of predicting the fluxes of other tracers that are withheld from the diagnosis, including even active tracers such as buoyancy, such that relative errors of 14% or less are found.

  15. Location of miners buried alive. Final report; Ortung verschuetteter Bergleute. Anforderungen und Pruefvorschriften fuer Ortungssysteme. Schlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Fischer, D.

    1996-12-31

    This research project is concerned with the question of the properties, which a usable system for the location of persons buried alive should have, and of how to check these. The most successful method at present consists of equipping miners with radio transmitters, the Mann transmitters. These send out electromagnetic waves constantly or on call up, which enable one to determine the site of the transmitter exactly by a directional and search device. In order to obtain the best possible accuracy of direction and to be practically independent of the properties of the material through which one is locating, the frequency of the electromagnetic waves for location should be less than 10 kHz. As in comparative tests above ground, it was found that there are effects from the spatial environment, all the investigations were carried out underground in the location test area of the DMT Tremonia experimental pit. (orig./MSK) [Deutsch] Das vorliegende Forschungsvorhaben befasst sich mit der Frage nach Eigenschaften, die ein einsatzfaehiges System zur Ortung verschuetteter Personen aufweisen sollte, und wie sie zu ueberpruefen sind. Die z.Z. erfolgreichste Methode besteht darin, Bergleute mit Funksendern, den Mannsendern, auszustatten. Diese senden staendig oder nach Aufruf elektromagnetische Wellen aus, die es gestatten, durch eine Peil- und Sucheinrichtung den Standort dieser Sender genau zu bestimmen. Um bestmoegliche Richtungsgenauigkeit zu erreichen und praktisch unabhaengig von den Eigenschaften des zu durchortenden Materials zu sein, sollte die Frequenz der fuer die Ortung ausschlaggebende elektromagnetischen Wellen kleiner als 10 kHz sein. Da sich bei Vergleichsversuchen ueber Tage gezeigt hat, dass es dort dennoch Einfluesse des raeumlichen Umfeldes gibt, wurden alle Untersuchungen nur noch unter Tage im Ortungs-Testgebiet der DMT-Versuchsgrube Tremonia durchgefuehrt. (orig./MSK)

  16. Forest report 2013 for Baden-Wuerttemberg; Waldzustandsbericht 2013 fuer Baden-Wuerttemberg

    Energy Technology Data Exchange (ETDEWEB)

    Meining, Stefan [Buero fuer Umweltueberwachung, Freiburg (Germany); Wilpert, Klaus v.; Schaeffer, Juergen; Hartmann, Peter; Schumacher, Joerg; Delb, Horst; John, Reinhold [Forstliche Versuchs- und Forschungsanstalt Baden-Wuerttemberg, Freiburg im Breisgau (Germany); Hoelscher, Andrea [Agentur fuer Nachhaltige Nutzung von Agrarlandschaften, Freiburg (Germany); Augustin, Nicole [Bath Univ. (United Kingdom); Hug, Ralph

    2013-07-01

    As an essential part of forest environmental monitoring, the Forest State Report 2013 shows how environmental factors influence the development of our forests. In addition to the annual survey of the crown state, intensive land surveys were established by the country, which provide extensive results over a long period. Data on the status and growth of the tree, the nutrient cycle, the material intake, soil status, soil vegetation and meteorology, ie the dynamics of environmental changes, are collected. Fortunately, the Forest State Report in 2013 shows that the state of the forests in Baden-Wuerttemberg has slightly improved compared to the previous year. This means that the trend towards the improvement of forest conditions continues after the extreme drought year 2003. This improvement is attributable to the spring weather which is favorable to the forest as well as to a generally low occurrence of harmful insects. [German] Als wesentlicher Teil des forstlichen Umweltmonitorings zeigt der Waldzustandsbericht 2013, wie Umweltfaktoren die Entwicklung unserer Waelder beeinflussen. Ergaenzend zur jaehrlichen Erhebung des Kronenzustandes wurden durch das Land Intensivmessflaechen eingerichtet, die umfangreiche Ergebnisse ueber einen langen Zeitraum liefern. Dort werden Daten zu Baumzustand und -wachstum, Naehrstoffkreislauf, Stoffeintrag, Bodenzustand, Bodenvegetation sowie Meteorologie, also die Dynamik der Umweltveraenderungen, erhoben. Erfreulicherweise zeigt der Waldzustandsbericht 2013, dass sich der Zustand der Waelder in Baden-Wuerttemberg gegenueber dem Vorjahr leicht verbessert hat. Damit setzt sich der Trend zur Verbesserung des Waldzustandes nach dem extremen Trockenjahr 2003 weiter fort. Diese Verbesserungstendenz laesst sich auf die fuer den Wald guenstige Fruehjahrswitterung sowie auf ein allgemein geringes Vorkommen an Schadinsekten zurueckfuehren.

  17. Wheeling of electricity and natural gas under the open access regime; Durchleitungsbedingungen fuer Strom und Gas

    Energy Technology Data Exchange (ETDEWEB)

    Perner, J.; Riechmann, C.; Schulz, W.

    1997-12-31

    In many countries, supply and distribution of electricity and natural gas hitherto was a business of the utilities in their demarcated supply districts (regional monopolies in Germany). In the wake of deregulation of energy sectors, this regime is to be replaced by the competitive market regime, and the principle of competition is intended to be introduced in the electric power and natural gas markets by establishing a system of open access of third parties (TPA) to existing distribution networks (TPA or open access wheeling). The book ventilates planned or applied approaches and concepts for access and transmission pricing in various countries and examines to what extent those concepts take into account the declared objectives of non-discrimination, transparency, and cost recovery. Further aspects discussed are conditions of TPA free of charge as well as conditions governing the required ancillary network services. The authors present an overview of available concepts based on international practice, with emphasis on practical aspects. (orig./CB) [Deutsch] Die Elektrizitaets- und Gasversorgung war in vielen Laendern traditionell in geschlossenen Versorgungsgebieten (in Deutschland regionale Monopole) organisiert. Wettbewerb innerhalb der Sparten Strom und Gas soll durch Zugang Dritter zu den bestehenden Transport- und Verteilungsnetzen (Durchleitung) eingefuehrt werden. Die Arbeit untersucht, nach welchen Konzepten und Methoden sich Durchleitungsentgelte berechnen lassen und inwieweit diese Verfahren Zielen wie Nichtdiskriminierung, Transparenz und Kostendeckung Rechnung tragen. Gegenstand der Analyse sind darueber hinaus auch nicht-entgeltliche Netzzugangsbedingungen wie die Behandlung von Zusatzdienstleistungen. Die Auswertung internationaler Erfahrungen gibt einen Ueberblick ueber die unterschiedliche Umsetzung der Reformbestrebungen, insbesondere die praktischen Moeglichkeiten der Ausgestaltung von Durchleitungsbedingungen fuer Strom und Gas. (orig.)

  18. Hydraulics for civil engieneers. Fundamentals and applications; Hydraulik fuer Bauingenieure. Grundlagen und Anwendungen

    Energy Technology Data Exchange (ETDEWEB)

    Freimann, Robert [Muenchen Hochschule (Germany). Fakultaet Bauingenieurwesen

    2009-07-01

    Hydraulics is the science of the forces of water at rest and in motion. In projects of the water industry, hydraulic calculations provide information for dimensioning structures and plants and for optimising the process that are going on inside. This textbook provides students with sufficient knowledge to solve hydraulic problems and invites them to do their owncalculations. For this, the main hydraulic facts for studies and practice are explained with the aid of calculated examples and problems for the reader to solve. Detailed solutions are provided at the back. The book is full of English terms, which are explained at the back in a glossary. The book addresses students of technical universities and similar institutions, but it may also be a reference manual for the practical engineer. (orig.) [German] Hydraulik ist die Wissenschaft von den Kraeften des ruhenden und des bewegten Wassers. In wasserwirtschaftlichen Planungen dienen die Resultate hydraulischer Berechnungen der Dimensionierung von entsprechenden Bauwerken und Anlagen sowie der Optimierung der darin ablaufenden Prozesse. Dieses Lehrbuch vermittelt den Studierenden das Wissen zur Bearbeitung hydraulischer Fragestellungen und befaehigt sie durch die anschauliche Darstellung zu selbststaendigen Berechnungen. Dabei werden die wichtigsten hydraulischen Zusammenhaenge fuer Studium und Praxis auch mithilfe von durchgerechneten Beispielen und durch den Leser zu loesenden Aufgaben erlaeutert. Zu letzteren sind am Ende des Lehrbuches ausfuehrliche Loesungswege zu finden. Das Buch ist gespickt mit englischen Fachbegriffen rund um die Hydraulik und enthaelt am Ende des Buches ein entsprechendes Verzeichnis. Dieses Buch richtet sich in erster Linie an Studierende des Bauingenieurwesens an Technischen Universitaeten, Fachhochschulen und vergleichbaren Bildungseinrichtungen. Neben der Vermittlung der im Studium erforderlichen Kenntnisse kann es aber auch dem Praktiker eine wertvolle Hilfe zur kurzfristigen

  19. Development of spraying equipment for shearer loaders; Entwicklung von Beduesungseinrichtungen fuer Walzenlader

    Energy Technology Data Exchange (ETDEWEB)

    Loehning, H.D. [Deutsche Montan Technologie GmbH, Essen (Germany). Fachstelle fuer Staub- und Silikosebekaempfung; Renner, K.P.. [Bergamt Gelsenkirchen (Germany); Tebbe, W. [Deutsche Montan Technologie GmbH, Essen (Germany). Abteilung Gewinnung und Aufbereitung

    2005-05-12

    fuer die Einstellung der Beduesungsueberwachung an den Walzenladern erarbeitet worden, welches das Erreichen beider Schutzziele nach dem derzeitigen Stand der Technik gewaehrleistet. (orig.)

  20. Stable amorphous semiconductors for solar cells. Final report; Stabile amorphe Halbleiterfilme fuer Solarzellen. Schlussbericht

    Energy Technology Data Exchange (ETDEWEB)

    Fuhs, W.; Lips, K.; Mell, H.; Stachowitz, R.; Will, S.; Ulber, I.

    1997-12-31

    This study was founded on the preceding projects. The main objective was the preparation and characterization of stable amorphous silicon films (a-Si:H) by plasma enhanced chemical vapor deposition (PECVD). For this purpose the deposition conditions were varied in a wide range. The main effort was on the change of the reactor geometry and the increase of the substrate temperature to values beyond 250 C. Comparative studies of the film stability were carried out using different degradation techniques. The electronic and structural properties of the films were investigated with the aim to find correlations between the stability and other film properties. Information on the defect density was obtained from electron spin resonance (ESR), photothermal deflection spectroscopy (PDS) and photocurrent spectroscopy (CPM). The influence of native and light-induced defects on the recombination kinetics was studied using both films and solar cells. The techniques mainly used for that were steady-state and frequency-resolved photoluminescence spectroscopy (FRS) and electrically detected magnetic resonance (EDMR). The results of these studies were published in international journals and presented at international conferences. (orig.) [Deutsch] Das Vorhaben baute auf den vorangegangenen Projekten auf. Wichtigstes Ziel war die Herstellung und Charakterisierung stabiler amorpher Siliziumfilme (a-Si:H) durch Plasmadeposition. Dazu wurden die Depositionsbedingungen in einem weiten Bereich variiert. Im Vordergrund standen dabei die Aenderung der Reaktorgeometrie und die Erhoehung der Substrattemperatur auf Werte oberhalb von 250 C. Die Stabilitaet der Filme wurde mit verschiedenen Degradationsverfahren vergleichend geprueft. Die Filme wurden hinsichtlich ihrer elektronischen und strukturellen Eigenschaften mit dem Ziel untersucht, einen Zusammenhang zwischen der Stabilitaet und anderen Probeneigenschaften aufzufinden. Als Messverfahren fuer die Defektdichte standen

  1. Use and evaluation of weather radar data for BALTEX. Final report; Einsatz und Auswertung von Wetterradardaten fuer BALTEX measurements. Abschlussbericht zum Einzelvorhaben

    Energy Technology Data Exchange (ETDEWEB)

    Doelling, I.; Riedl, J.; Seltmann, J.

    1998-04-01

    Area precipitation data derived from weather radar data are necessary for the energy balance of the Baltic See catchment area. Procedures to eliminate clutter in radar data by aid of time series filtering were investigated; the adjustment of relevant parameters (e.g. filter type, threshold and antenna speed) were optimized relating to maximal clutter correction and minimal precipitation reduction and have been recommended for operational use in the DWD radar network. Statistical well defined drop size spectra were generated by accumulation to estimate average site- and rain type-typical Z-R-relations (Z=A x R{sup b}) for northern Germany. Assuming exponential drop size distributions values of A{approx}300 for thunderstorms and A{approx}200 for the remaining precipitation types were found in the relation Z=A x R{sup 1,5} for all sites (Hamburg, Rostock, Berlin). Adjusted (by rain gauges) area precipitation distributions of daily and hourly rain amounts were determined for nine selected days of the intensive observation period (PIDCAP, August - Oktober 1995) and provided to other research groups. Differences in the height extensions of showers over sea resp. land were found corresponding to the theoretical effects of different surface conditions (temperature, friction). (orig.) [Deutsch] Fuer die Energiebilanz des Ostsee-Einzugsgebietes werden flaechendeckende Niederschlagsdaten benoetigt, die aus Wetterradardaten zu bestimmen sind. Die Verfahren zur Bereinigung der Radardaten von Falschechos (Clutter) mit Hilfe von Zeitreihenfilterung im Signalprozessor wurden untersucht, die Parametereinstellung (Filtertyp, Schwellwert und Antennengeschwindigkeit) bezueglich bester Clutterkorrektur bei moeglichst geringer Niederschlagsdaempfung optimiert und entsprechende Einstellempfehlungen fuer die operationellen Radarverbundanlagen erarbeitet. Bei der Bestimmung mittlerer fuer Norddeutschland ortsspezifischer und niederschlagstypischer Z-R-Beziehungen (Z=A x R{sup b}) zur

  2. Joining technology for parts for plastic and thin sheet metal parts; Fuegetechniken fuer Bauteile aus Kunststoff und duennwandigem Metall

    Energy Technology Data Exchange (ETDEWEB)

    Ahlers-Hestermann, G. [BOELLHOFF, Bielefeld (Germany)

    2001-07-01

    With the ongoing application of new materials (Al, Mg, Plastic) as an alternative to steel in light-weight body in white construction it is necessary to develop and use other joining and fixing technologies than spot welding, bolt-and nut-welding. These new technologies for example are mechanical joining technology as clinching and self-pierce-riveting, blind-riveting and special elements to fix other parts as blind-rivets and self-piercing nuts and bolts. These products are mainly used for metal materials and mixed structures. To fix other parts to plastic-parts direct-screwing or the after-moulding-technology with metal or plastic inserts is used. (orig.) [German] Mit der verstaerkten Anwendung von weiteren Werkstoffen (Al, Mg, Kunststoffe) als Stahl im Automobilbau ist die Notwendigkeit erwachsen, alternative Fuege- und Befestigungstechniken zum Punktschweissen, Bolzen- und Mutternschweissen zu entwickeln. Hierzu gehoeren die mechanischen Fuegetechniken wie Stanznieten, Clinchen, Blindnieten sowie die sogenannten Funktionselemente zum Befestigen von Anbauteilen, wie Blind- und Stanznietmuttern und -bolzen. Diese Verfahren werden ueberwiegend fuer metallische Werkstoffe oder bei Mischbauweise angewandt. Fuer die Befestigung an Kunststoffbauteilen wird die Direktverschraubung oder die after-moulding-technik (AMTEC {sup registered}) verwendet. (orig.)

  3. Molecular biological test systems for indicator bacteria in drinking water; Molekularbiologische Testsysteme fuer den Nachweis von Indikatorbakterien im Trinkwasser

    Energy Technology Data Exchange (ETDEWEB)

    Frahm, E. [WFM Wasserforschung Mainz GmbH (Germany)

    2000-07-01

    The authors intended to develop a molecular biological detection method for common indicator bacteria which can be an alternative to conventional methods. The method was to be fast (max. 24 h), simple, and economical. Tests were carried out on E. coli, P. aeruginosa and enterococci. [German] Das Ziel der vorgestellten Arbeit ist es, ein molekularbiologisches Nachweisverfahren fuer gaengige Indikatorbakterien zu entwickeln, das als Alternative zu den konventionellen Verfahren eingesetzt werden kann. Es wurde versucht, Rahmenbedingungen entsprechend den geltenden Bestimmungen einzuhalten und folgende Schwerpunkte wurden gesetzt: - Schnelligkeit: Ziel ist die Abwicklung an einem Arbeitstag, maximal 24 Stunden; - Genauigkeit: Der Ablauf soll standardisierbar und Ergebnisse gut reproduzierbar sein; - Einfaches 'handling': Moeglichst geringer Trainingsaufwand fuer Laborpersonal; - Kostenguenstig: Geraete und Reagenzien sollen in einem gut ausgestatteten Labor moeglichst vorhanden bzw. schnell und preiswert verfuegbar sein. Als zu testende Indikatororganismen wurden, E. coli, P. aeruginosa und die Familie der Enterokokken ausgewaehlt. Sowohl in den existierenden als auch in zur Zeit entstehenden Regelwerken haben diese Parameter eine zentrale Stellung. (orig.)

  4. Detecting and removing electrosmog. Information and practical hints for protection; Elektrosmog erkennen und beseitigen. Praktische Ratschlaege und Tips fuer Schutzmassnahmen

    Energy Technology Data Exchange (ETDEWEB)

    Freyer, U.

    1998-09-01

    Electromagnetic waves and fields are invisible and are perceivable only via their effects. Apart from the wanted effects, there are a number of unwanted effects that can be induced. These are generally known by the term electrosmog, and a distinction is made between effects on man and effects on electrical equipment or systems. The clearly arranged information of the book explains the mechanisms of interaction between electromagnetic fields and biological or electrical systems and the relevant ways and means of protection from the practical angle, referring to conditions of everyday life. The theoretical and physical aspects of electromagnetic waves and their effects are presented only to the extent necessary for fully understanding the mechanisms. (orig./CB) [Deutsch] Elektromagnetische Wellen und Felder kann man nicht sehen, sondern nur deren Wirkung feststellen. Neben den gewollten Effekten sind dabei auch stoerende Einfluesse moeglich. Fuer diese hat sich der Begriff Elektrosmog eingebuergert. Dabei muss zwischen Auswirkungen auf den Menschen und auf elektrische Anlagen unterschieden werden. Dieses Buch zeigt in ueberschaubarer Form den Wirkungsmechanismus des Elektrosmogs unter verschiedenen Bedingungen auf und beschreibt die moeglichen Abhilfemassnahmen. Dabei wird praxisorientiert vorgegangen. Theoretische Betrachtungen erfolgen nur in dem fuer das Verstaendnis der Zusammenhaenge erforderlichen Umfang. (orig./MG)

  5. Design instructions for condensers and recirculation coolers with axial blowers; Auslegungshinweis fuer Verfluessiger und Rueckkuehler mit Axialventilatoren

    Energy Technology Data Exchange (ETDEWEB)

    Handschuh, R. [Hans Guentner GmbH, Fuerstenfeldbruck (Germany)

    2003-07-01

    Apart from an explanation of the selectrion criteria for condensers and recirculation coolers with axial blowers for outside installation, information is presented on sound propagation. Selection according to the condensing capacity O{sub c}, the recooling rate Q{sub H} and the available floor space can be made with the aid of the Guentner Product Calculator GPC. Permissible noise emissions and adjacent installation of condensers and recoolers are gone into as well as noise propagation as a function of external noise, noise direction, noise reflection, the number of noise sources, the distance of the noise source from the emission point, and possible noise abatement factors are gone into as well. (orig.) [German] Neben der Erlaeuterung der Auswahlkriterien fuer Verfluessiger und Rueckkuehler mit Axialventilatoren zur Aufstellung im Freien werden Hinweise fuer die Schallausbreitung gegeben. Die Auswahl nach der Verfluessigungsleistung Q{sub c} bzw. der Rueckkuehlleistung Q{sub H} und der vorhandenen Aufstellflaeche kann mit dem Guentner Product Calculator GPC geschehen. Es wird auf die zulaessige Geraeuschimmission auf die Nachbarschaft von Verfluessigern und Rueckkuehlern eingegangen und deren Schallausbreitung in Abhaengigkeit von Fremdgeraeuscheinwirkungen, Schallrichtwirkung, der Schallreflexion, der Anzahl der Schallquellen, der Entfernung der Schallquelle zur Emissionsstelle und moegliche Daempfungen betrachtet. (orig.)

  6. A new aquifer assessment tool using reactive tracers

    Science.gov (United States)

    McKnight, D.; Smalley, A. L.; Banwart, S. A.; Lerner, D. N.; Thomson, N. R.; Thornton, S. F.; Wilson, R. D.

    2003-04-01

    A major obstacle to making informed decisions about trigger levels for restoration and choosing remediation options is that current Site Investigation (SI) practice fails to make optimal use of available SI techniques resulting in poor value for money in conceptual site models. Often it is simply too expensive to obtain the type of site data required to build the case for natural attenuation, even though this restoration option may be relatively cheaper than a pump-and-treat system. In particular, aquifer property measurement techniques for groundwater transport and reactions are too costly and this results in over-reliance on literature values or model assumptions. This results in overly uncertain predictions of in situ performance and therefore unnecessarily cautious risk assessment and costly remediation strategies. Therefore, cost-effective SI tools that have the capability of producing high quality characterisation data are required. The dipole flow test which circulates groundwater between isolated injection (source) and extraction (sink) chambers within a single borehole has been used successfully by others to delineate heterogeneous hydraulic properties in both highly permeable and fractured rock aquifers. We propose to extend this approach by adding a suite of reactive tracers into a dipole flow field to assess the geochemical properties and biodegradation potential of aquifers. If successful this will provide a method to ascertain site-specific parameters for use in appropriate reactive transport models. The initial phase of this project involves the construction of a laboratory-scale physical model of a dipole probe to investigate the utility of the dipole flow and reactive tracer test (DFRTT) as an aquifer assessment tool. This phase will also serve as the developmental stage between mathematical theory and a host of planned field trials. The development of the laboratory-scale DFRTT including initial scoping calculations, numerical simulation results

  7. Anthropogenic contaminants as tracers in an urbanizing karst aquifer

    Science.gov (United States)

    Mahler, Barbara; Massei, Nicolas

    2007-04-01

    Karst aquifers are uniquely vulnerable to contamination. In the Barton Springs segment of the karstic Edwards aquifer (Texas, U.S.A.), urban contaminants such as pesticides and volatile organic compounds frequently are detected in spring base flow. To determine whether contaminant concentrations change in response to storms, and if they therefore might act as tracers of focused recharge, samples were collected from Barton Springs at closely spaced intervals following three storms. Two herbicides (atrazine and simazine), two insecticides (carbaryl and diazinon), and a solvent (tetrachloroethene) described breakthrough curves over a 1-week period following one or more storms. The breakthrough curves were decomposed into two to five log-normal subcurves, which were interpreted as representing pulses of contaminants moving through the aquifer. Each subcurve could be used in the same way as an artificial tracer to determine travel time to and recovery at the spring. The contaminants have several advantages over artificial tracers: they represent the actual compounds of interest, they are injected essentially simultaneously at several points, and they are injected under those conditions when transport is of the most interest, i.e., following storms. The response of storm discharge, specific conductance, and contaminant loading at the spring depended on initial aquifer flow conditions, which varied from very low (spring discharge of 0.48 m 3/s) to high (spring discharge of 2.7 m 3/s): concentrations and recovery were the highest when initial aquifer flow conditions were low. This behavior provides information about aquifer structure and the influence of aquifer flow condition on transport properties.

  8. Small-molecule PET Tracers for Imaging Proteinopathies.

    Science.gov (United States)

    Mathis, Chester A; Lopresti, Brian J; Ikonomovic, Milos D; Klunk, William E

    2017-09-01

    In this chapter, we provide a review of the challenges and advances in developing successful PET imaging agents for 3 major types of aggregated amyloid proteins: amyloid-beta (Aβ), tau, and alpha-synuclein (α-syn). These 3 amyloids are involved in the pathogenesis of a variety of neurodegenerative diseases, referred to as proteinopathies or proteopathies, that include Alzheimer disease, Lewy body dementias, multiple system atrophy, and frontotemporal dementias, among others. In the Introduction section, we briefly discuss the history of amyloid in neurodegenerative diseases and describe why progress in developing effective imaging agents has been hampered by the failure of crystallography to provide definitive ligand-protein interactions for rational radioligand design efforts. Instead, the field has relied on largely serendipitous, trial-and-error methods to achieve useful and specific PET amyloid imaging tracers for Aβ, tau, and α-syn deposits. Because many of the proteopathies involve more than 1 amyloid protein, it is important to develop selective PET tracers for the different amyloids to help assess the relative contribution of each to total amyloid burden. We use Pittsburgh compound B to illustrate some of the critical steps in developing a potent and selective Aβ PET imaging agent. Other selective Aβ and tau PET imaging compounds have followed similar pathways in their developmental processes. Success for selective α-syn PET imaging agents has not been realized yet, but work is ongoing in multiple laboratories throughout the world. In the tau sections, we provide background regarding 3-repeat (3R) and 4-repeat (4R) tau proteins and how they can affect the binding of tau radioligands in different tauopathies. We review the ongoing efforts to assess the properties of tau ligands, which are useful in 3R, 4R, or combined 3R-4R tauopathies. Finally, we describe in the α-syn sections recent attempts to develop selective tracers to image

  9. Rebuilding sources of linear tracers after atmospheric concentration concentration

    Directory of Open Access Journals (Sweden)

    J.-P. Issartel

    2003-06-01

    Full Text Available The identification of widespread sources of passive tracers out of atmospheric concentration measurements has become an important challenge of modern meteorology. The paper proposes some mathematical tracks to address this reconstruction of the complex space-time geometry of the sources. The methods are based upon the use of retroplumes. The inverse problem is addressed in a deterministic non statistical frame. The information obtained by local measurements is spread by introducing the concept of illumination. The constraint that the source to be rebuilt is non negative is also addressed. The experimental source ETEX1 is rebuilt in order to evaluate an impulse response of the algorithms.

  10. Flexible tools for interpreting tracer measurements and recent applications

    Science.gov (United States)

    Gusyev, M.; Stewart, M.

    2012-04-01

    Steady increase of groundwater abstraction and nitrate concentrations in groundwater due to agricultural and industrial practices is a major concern for groundwater availability and deterioration of groundwater quality in New Zealand. Studies on groundwater in the Waimea Plains (for example) have shown effects of nitrate input from both diffuse and point sources since 1940. Groundwaters in gravel aquifers under Christchurch have also been studied since 1970 to characterise their flowpaths and recharge sources. In these and other cases, the mixing of waters from different recharge sources following different flow paths can be determined with the use of various tracers and the future course of nitrate concentration in the groundwaters predicted. The input of radionuclides to hydrological systems from nuclear weapons testing in the 1950s and 60s revealed that outflows from such systems often comprise mixtures of water with very wide ranges of ages. Many authors have described methods of deconvolving such outputs with the use of lumped parameter models (LPMs). LPMs are evaluated using specialized software or Excel spreadsheets to compute simulations to measurements of system outputs and therefore estimate parameters of the age distribution. Excel allows easy modification of the code to enable application to individual hydrological features and for a variety of isotopes and chemicals. For the New Zealand studies, Excel spreadsheets with coded Visual Basic functions are used to deduce age distributions based on stable isotope, SF6, CFCs, 3H and 14C data (in order of ages). In particular, 3H is becoming increasingly useful as an age tracer due to the decrease of ambiguity from nuclear testing provided that the measurements can be made with high accuracy (Stewart et al., 2012).These age distributions allow us to derive the input histories of chemicals (e.g. nitrate) and the groundwater recharge sources. In addition, recent developments in modelling groundwater flow and

  11. Environmental radionuclides tracers and timers of terrestrial processes

    CERN Document Server

    Froehlich, Klaus

    2009-01-01

    The book presents a state-of-the-art summary of knowledge on the use of radionuclides to study processes and systems in the continental part of the Earth's environment. It is conceived as a companion to the two volumes of this series, which deal with isotopes as tracers in the marine environment (Livingston, Marine Radioactivity) and with the radioecology of natural and man-made terrestrial systems (Shaw, Radioactivity in Terrestrial Ecosystems). Although the book focuses on natural and anthropogenic radionuclides (radioactive isotopes), it also refers to stable environmental isotopes, which i

  12. Quality assurance and quantitative error analysis by tracer techniques

    Energy Technology Data Exchange (ETDEWEB)

    Schuetze, N.; Hermann, U.

    1983-12-01

    The locations, types and sources of casting defects have been tested by tracer techniques. Certain sites of moulds were labelled using /sup 199/Au, /sup 24/Na sodium carbonate solution, and technetium solution produced in the technetium generator on a /sup 99/Mo//sup 99/Tc elution column. Evaluations were made by means of activity measurements and autoradiography. The locations and causes of casting defects can be determined by error analysis. The surface defects of castings resulting from the moulding materials and from the blacking can be detected by technetium, the subsurface defects are located by gold.

  13. Geotropic tracers in turbulent flows: a proxy for fluid acceleration

    CERN Document Server

    Boffetta, Guido; De Lillo, Filippo; Santamaria, Francesco

    2013-01-01

    We investigate the statistics of orientation of small, neutrally buoyant, spherical tracers whose center of mass is displaced from the geometrical center. If appropriate-sized particles are considered, a linear relation can be derived between the horizontal components of the orientation vector and the same components of acceleration. Direct numerical simulations are carried out, showing that such relation can be used to reconstruct the statistics of acceleration fluctuations up to the order of the gravitational acceleration. Based on such results, we suggest a novel method for the local experimental measurement of accelerations in turbulent flows.

  14. The characterization of petroleum contamination in heterogenous media using partitioning tracer method

    Energy Technology Data Exchange (ETDEWEB)

    Kim, E.; Rhee, S.; Park, J. [Seoul National Univ. (Korea, Republic of). Dept. of Civil and Environmental Engineering

    2009-07-01

    A partitioning tracer method for characterizing petroleum contamination in heterogenous media was discussed. The average saturation level of nonaqueous phase liquids (NAPLs) was calculated by comparing the transport of the partitioning tracers to a conservative tracer. The NAPL saturation level represented a continuous value throughout the contaminated site. Experiments were conducted in a 2-D sandbox divided into 4 parts using different-sized sands. Soils were contaminated with a mixture of kerosene and diesel. Partitioning tracer tests were conducted both before and after contamination. A partitioning batch test was conducted to determine the partition coefficient (K) of the tracer between the NAPL and water. Breakthrough curves were obtained, and a retardation factor (R) was calculated. Results of the study showed that the calculated NAPL saturation was in good agreement with determined values. It was concluded that the partitioning tracer test is an accurate method of locating and quantifying NAPLs.

  15. Selection of compressors and drives for natural gas storage and transport - technical and economic aspects; Auswahl von Verdichtern und Antriebsmaschinen fuer die Erdgasspeicherung und den Erdgastransport - technische und wirtschaftliche Aspekte

    Energy Technology Data Exchange (ETDEWEB)

    Heyer, F.; Wieke, S. [Heyer und Wieke Engineering, Muenchen (Germany)

    1998-12-31

    Selection of the proper compressor/drive combination is indispensable for optimizing natural gas storage. The contribution presents a comparison of the available systems. (orig.) [Deutsch] Fuer die Verdichtung von Erdgas fuer die Erdgasspeicherung und den Erdgastransport ist die Auswahl der fuer den jeweiligen Anwendungsfall geeigneten Verdichter-Antriebskombination eine wesentliche Voraussetzung fuer einen technisch und wirtschaftlich optimalen Betrieb. Unter Beruecksichtigung des Marktes werden die Varianten (Verdichter-Antriebskombinationen) definiert und in einem technischen Vergleich Vor- und Nachteile der einzelnen Alternativen gegenuebergestellt und bewertet. Die Einhaltung der Betriebsanforderungen und der Anforderungen der TA-Luft und TA-Laerm, der Wirkungsgrad, die Zuverlaessigkeit und Verfuegbarkeit muessen einer besonders intensiven Pruefung und Beurteilung unterzogen werden. Das Ergebnis der vergleichenden Bewertung der Varianten kann eine neue Definition der Varianten oder der Anforderungen notwendig machen. (orig.)

  16. Sonde for Downhole Measurement of Water Turbidity and Dye Tracer Concentration

    OpenAIRE

    Schnegg, Pierre-André; Bossy, F.

    2005-01-01

    A new flow-through field fluorometer sonde has been designed for use in downhole tracer tests in 2’’ boreholes. The instrument is capable of determining the partial concentration of two dye tracers present simultaneously in the water. In addition, turbidity can be measured if the water is free of tracers. Although the sonde is aimed at boreholed hydrological investigations, it can also be used in surface waters.

  17. Final Progress Report for Project Entitled: Quantum Dot Tracers for Use in Engineered Geothermal Systems

    Energy Technology Data Exchange (ETDEWEB)

    Rose, Peter [Univ. of Utah, Salt Lake City, UT (United States); Bartl, Michael [Univ. of Utah, Salt Lake City, UT (United States); Reimus, Paul [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Williams, Mark [Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Mella, Mike [Univ. of Utah, Salt Lake City, UT (United States)

    2015-09-12

    The objective of this project was to develop and demonstrate a new class of tracers that offer great promise for use in characterizing fracture networks in EGS reservoirs. From laboratory synthesis and testing through numerical modeling and field demonstrations, we have demonstrated the amazing versatility and applicability of quantum dot tracers. This report summarizes the results of four years of research into the design, synthesis, and characterization of semiconductor nanocrystals (quantum dots) for use as geothermal tracers.

  18. Fractured-rock hydrogeophysics with electrically conductive and neutrally buoyant tracers

    Science.gov (United States)

    Shakas, A.; Linde, N.; Baron, L.; Le Borgne, T.; Bour, O.; Lavenant, N.; Gerard, M. F.

    2016-12-01

    Artificial tracer tests help to characterize and understand the dynamics of groundwater systems. This remains a challenging task, especially when dealing with highly heterogeneous formations in which flow can be very localized and the interpretation of tracer breakthrough curves may be ambiguous. As a complement to tracer tests, ground-penetrating radar (GPR) and electrical resistivity tomography can map the space-time migration of electrically conductive tracers. In hydrogeophysics, the most common tracer is dissolved table salt in water. However, conventional salt tracers lead to density effects that are often ignored. Even less than 1% density variations can have a dramatic effect on transport behavior and affect tracer tests in complex ways. Such effects have been demonstrated in our previous experiments that used single-hole GPR to monitor saline push-pull tests in fractured granite. It is possible to model density effects, but this leads to computational complexity and field dynamics that are not necessarily representative of the natural responses of the system. To minimize density effects, we performed a new set of push-pull tests using a neutrally buoyant and electrically conductive tracer at the same test site located close to Ploemeur, France. This novel tracer consists of a mixture of salt (NaCl), water and pure ethanol. Ethanol has a density of 789 g/L at 20° C and is used to counter-act the salt-induced density increase. Our GPR time-lapse images and tracer breakthrough data indicate a largely reversible transport process that confirms the neutral buoyancy of the tracer. Ethanol is biodegradable and does not pose significant environmental issues. Furthermore, calibration of the neutral-buoyant mixture is straightforward to perform in the field using Archimedes principle. Based on these results, we argue that neutrally buoyant ethanol-salt-water mixtures are ideal for a wide variety of hydrogeophysical tracer tests in porous or fractured media.

  19. Effect of room air recirculation delay on the decay rate of tracer gas concentration

    Energy Technology Data Exchange (ETDEWEB)

    Kristoffersen, A.R.; Gadgil, A.J.; Lorenzetti, D.M.

    2004-05-01

    Tracer gas measurements are commonly used to estimate the fresh air exchange rate in a room or building. Published tracer decay methods account for fresh air supply, infiltration, and leaks in ductwork. However, the time delay associated with a ventilation system recirculating tracer back to the room also affects the decay rate. We present an analytical study of tracer gas decay in a well-mixed, mechanically-ventilated room with recirculation. The analysis shows that failing to account for delays can lead to under- or over-estimates of the fresh air supply, depending on whether the decay rate calculation includes the duct volume.

  20. Tracer transport in fractured crystalline rock: Evidence of nondiffusive breakthrough tailing

    Science.gov (United States)

    Becker, M.W.; Shapiro, A.M.

    2000-01-01

    Extended tailing of tracer breakthrough is often observed in pulse injection tracer tests conducted in fractured geologic media. This behavior has been attributed to diffusive exchange of tracer between mobile fluids traveling through channels in fractures and relatively stagnant fluid between fluid channels, along fracture walls, or within the bulk matrix. We present a field example where tracer breakthrough tailing apparently results from nondiffusive transport. Tracer tests were conducted in a fractured crystalline rock using both a convergent and weak dipole injection and pumping scheme. Deuterated water, bromide, and pentafluorobenzoic acid were selected as tracers for their wide range in molecular diffusivity. The late time behavior of the normalized breakthrough curves were consistent for all tracers, even when the pumping rate was changed. The lack of separation between tracers of varying diffusivity indicates that strong breakthrough tailing in fractured geologic media may be caused by advective transport processes. This finding has implications for the interpretation of tracer tests designed to measure matrix diffusion in situ and the prediction of contaminant transport in fractured rock.

  1. Human calcium metabolism including bone resorption measured with {sup 41}Ca tracer

    Energy Technology Data Exchange (ETDEWEB)

    Freeman, S.P.H.T. [Lawrence Livermore National Lab., CA (United States); King, J.C. [California Univ., Berkeley, CA (United States). Dept. of Nutritional Science; Vieira, N.E. [National Inst. of Child Health and Human Development, Bethesda, MD (United States); Woodhouse, L.R. [California Univ., Berkeley, CA (United States). Dept. of Nutritional Science; Yergey, A.L. [National Inst. of Child Health and Human Development, Bethesda, MD (United States)

    1996-08-01

    Accelerator mass spectrometry is so sensitive to small quantities of {sup 41}Ca that it might be used as a tracer in the study of human calcium kinetics to generate unique kinds of data. In contrast with the use of other Ca isotopic tracers, {sup 41}Ca tracer can be so administered that the tracer movements between the various body pools achieve a quasi steady state. Resorbing bone may thus be directly measured. We have tested such a protocol against a conventional stable isotope experiment with good agreement.

  2. Low-cost, High Flexibility I-V Curve Tracer for Photovoltaic Modules

    DEFF Research Database (Denmark)

    Ibirriaga, Julen Joseba Maestro; Pena, Xabier Miquelez de Mendiluce; Opritescu, Adrian

    2010-01-01

    This work presents the design, construction and test of an in-door low cost, high flexibility I-V curve tracer for photovoltaic modules. The tracer is connected to a Xenon lamp based flashing solar simulator. The designed tracer is able to deal with the very fast changing irradiation conditions...... and its control software offers the flexibility to automatically adapt to the different irradiation conditions set by the flashing solar simulator. Simulation and experimental tests have been carried out, in order to verify the behaviour and performance of the designed I-V curve tracer....

  3. Estimation of migration characteristics of a nonsorbing tracer through an artificial rock fracture

    Energy Technology Data Exchange (ETDEWEB)

    Ryu, B. H.; Park, J. K.; Han, P. S. [KAERI, Taejon (Korea, Republic of)

    1998-10-01

    Experiment on the transport of a nonsorbing tracer in an artificial rock fracture was carried out. The scale of an artificial rock was 50x20x5cm. The migration field was assumed as a two dimensional system. Eosine, a kind of an organic dye, was used as a nonsorbing tracer. This tracer was injected as a pulse function in a point source and point withdraw system. Volumetric flow rate was 0.5ml/min. The migration plume of the tracer was captured by a digital camera and compared with a result from transport modeling.

  4. The use of synthetic colloids in tracer transport experiments in saturated rock fractures

    Energy Technology Data Exchange (ETDEWEB)

    Reimus, Paul William [Univ. of California, Berkeley, CA (United States)

    1995-08-01

    Studies of groundwater flow and contaminant transport in saturated, fractured geologic media are of great interest to researchers studying the potential long-term storage of hazardous wastes in or near such media. A popular technique for conducting such studies is to introduce tracers having different chemical and physical properties into a system and then observe the tracers at one or more downstream locations, inferring flow and transport mechanisms from the breakthrough characteristics of the different tracers. Many tracer studies have been conducted in saturated, fractured media to help develop and/or refine models capable of predicting contaminant transport over large scales in such media.

  5. AN INTEGRATED APPROACH TO CHARACTERIZING BYPASSED OIL IN HETEROGENEOUS AND FRACTURED RESERVOIRS USING PARTITIONING TRACERS

    Energy Technology Data Exchange (ETDEWEB)

    Akhil Datta-Gupta

    2003-08-01

    We explore the use of efficient streamline-based simulation approaches for modeling partitioning interwell tracer tests in hydrocarbon reservoirs. Specifically, we utilize the unique features of streamline models to develop an efficient approach for interpretation and history matching of field tracer response. A critical aspect here is the underdetermined and highly ill-posed nature of the associated inverse problems. We have adopted an integrated approach whereby we combine data from multiple sources to minimize the uncertainty and non-uniqueness in the interpreted results. For partitioning interwell tracer tests, these are primarily the distribution of reservoir permeability and oil saturation distribution. A novel approach to multiscale data integration using Markov Random Fields (MRF) has been developed to integrate static data sources from the reservoir such as core, well log and 3-D seismic data. We have also explored the use of a finite difference reservoir simulator, UTCHEM, for field-scale design and optimization of partitioning interwell tracer tests. The finite-difference model allows us to include detailed physics associated with reactive tracer transport, particularly those related with transverse and cross-streamline mechanisms. We have investigated the potential use of downhole tracer samplers and also the use of natural tracers for the design of partitioning tracer tests. Finally, the behavior of partitioning tracer tests in fractured reservoirs is investigated using a dual-porosity finite-difference model.

  6. Accurate blood flow measurements: are artificial tracers necessary?

    Science.gov (United States)

    Poelma, Christian; Kloosterman, Astrid; Hierck, Beerend P; Westerweel, Jerry

    2012-01-01

    Imaging-based blood flow measurement techniques, such as particle image velocimetry, have become an important tool in cardiovascular research. They provide quantitative information about blood flow, which benefits applications ranging from developmental biology to tumor perfusion studies. Studies using these methods can be classified based on whether they use artificial tracers or red blood cells to visualize the fluid motion. We here present the first direct comparison in vivo of both methods. For high magnification cases, the experiments using red blood cells strongly underestimate the flow (up to 50% in the present case), as compared to the tracer results. For medium magnification cases, the results from both methods are indistinguishable as they give the same underestimation of the real velocities (approximately 33%, based on in vitro reference measurements). These results suggest that flow characteristics reported in literature cannot be compared without a careful evaluation of the imaging characteristics. A method to predict the expected flow averaging behavior for a particular facility is presented.

  7. Using biofuel tracers to study alternative combustion regimes

    Science.gov (United States)

    Mack, J. H.; Flowers, D. L.; Buchholz, B. A.; Dibble, R. W.

    2007-06-01

    Interest in the use of alternative fuels and engines is increasing as the price of petroleum climbs. The inherently higher efficiency of Diesel engines has led to increased adoption of Diesels in Europe, capturing approximately 40% of the new passenger car market. Unfortunately, lower CO2 emissions are countered with higher nitrogen oxides (NOx) and particulate matter (PM) emissions and higher noise. Adding oxygenated compounds to the fuel helps reduce PM emissions. However, relying on fuel alone to reduce PM is unrealistic due to economic constraints and difficult due to the emerging PM standards. Keeping peak combustion temperature below 1700 K inhibits NOx formation. Altering the combustion regime to burn at temperatures below the NOx threshold and accept a wide variety of fuels seems like a promising alternative for future engines. Homogeneous charge compression ignition (HCCI) is a possible solution. Fuel and air are well mixed prior to intake into a cylinder (homogeneous charge) and ignition occurs by compression of the fuel-air mixture by the piston. HCCI is rapid and relatively cool, producing little NOx and PM. Unfortunately, it is hard to control since HCCI is initiated by temperature and pressure instead of a spark or direct fuel injection. We investigate biofuel HCCI combustion, and use intrinsically labeled biofuels as tracers of HCCI combustion. Data from tracer experiments are used to improve our combustion modeling.

  8. Titan's post-equinox circulation revealed using chemical tracers

    Science.gov (United States)

    Teanby, N. A.; Irwin, P. G. J.; Nixon, C. A.; de Kok, R.; Vinatier, S.; Coustenis, A.; Calcutt, S. B.

    2012-04-01

    Titan’s atmosphere harbors a vast array of minor chemical compounds produced by its active photochemical cycle - including many hydrocarbon and nitrile species. These species have a wide range of lifetimes and can be used as chemical tracers of atmospheric motion on a variety of time scales (Teanby et al 2008). Therefore, by measuring how the abundances of these species vary during Cassini’s mission so far, it is possible to probe changes in Titan’s general circulation. Here we use eight years of Cassini Composite InfraRed Spectrometer (CIRS) data to study how the atmospheric circulation behaves during the equinox and post-equinox periods. As northern winter progressed to northern spring, significant changes in the distribution of trace gases were observed. These include an increase in trace gas abundance at the north pole and northward migration of the vortex boundary. The implications of the observed changed will be discussed - including a possible interpretation of the recent changes as a weakening of the north polar vortex accompanied by a reduction in cross-vortex mixing. References: Teanby, N. A., et al. (2008) "Titan's winter polar vortex structure revealed by chemical tracers". JGR-Planets, Vol. 113, E12003. Figure showing the observed variations in temperature and composition from the mission so far.

  9. Tracers discrimination of sediment provenience in rural catchment through EDXRF

    Energy Technology Data Exchange (ETDEWEB)

    Melquiades, Fabio L. [Universidade Estadual do Centro Oeste (UNICENTRO), Guarapuava, PR (Brazil). Dept. de Fisica; Thomaz, Edivaldo L. [Universidade Estadual do Centro Oeste (UNICENTRO), Guarapuava, PR (Brazil). Dept. de Geografia

    2010-07-01

    Full text: Sediment dynamics understanding in a drainage system is fundamental for soil and water conservation at hydro graphic basins. This work aim was to discriminate sediment provenance tracers in rural basin. Sediment samples from different points in the headwater (road, forest, riverbank, river sediment deposit) were collected. Energy Dispersive X-ray Fluorescence (EDXRF) was the analytical technique applied, which was efficient to detect the chemical composition of the sediments. The samples were dried for 48h at 50 deg C, ground and sieved for granulometry 1mm. In natura samples (3 g) were placed in cells covered with mylar film for irradiation. Titanium, Mn, Fe, Cu, Zn, Y and Zr were identified. It was concluded that the elements, when analyzed individually or paired, do not allow a clear environment distinction except for yttrium (Y) that indicates distinct characteristics between the riverbank materials related to the other environments. However, the cluster analysis provided discrimination between the different sources of sediment. Also, it was verified that the recent deposited sediment in the river channel displays greater similarity with the materials of the road than with the riverbank. It is probable that the roads has been the mainly sediment source in the studied headwater. The methodology is innovative for tracer determination in soil and erosion quantification. (author)

  10. Acupuncture meridians demythified. A study using the radioactive tracer method

    Energy Technology Data Exchange (ETDEWEB)

    Simon, J.; Esquerre, J.P.; Guiraud, R.; Guiraud, G.; Lazorthes, Y.

    1988-07-01

    Radioactive trajectories can be visualized by injecting a radioactive tracer, technetium 99 m, at the site of acupuncture points. To determine the exact nature of these trajectories we performed several experiments on healthy volunteers, and our results may be summarized as follows. The target organs of technetium 99 m, and notably the thyroid gland, were always visualized. The circulating radioactivity, visible on scintiscans and confirmed by venous blood counts, was not negligible. The radioactive trajectories we observed were often divided at their starting point and did not extend along the whole length of the acupuncture meridians they might have made visible. The radioactive trajectories disappeared after venous blockade to reappear when the blockade was lifted. Finally, the radioactive trajectories obtained were very similar after injection at the acupuncture point and at a control point. These findings indicate a lymphatic and venous drainage of the radioactive tracer at the site of injection followed by transportation through the veins, rather than visualization of acupuncture meridians as suggested by some authors.

  11. Inversion of Hydrological Tracer Test Data Using TomogrpahicConstraints

    Energy Technology Data Exchange (ETDEWEB)

    Linde, Niklas; Finsterle, Stefan; Hubbard, Susan

    2004-11-11

    A reasonable description of the hydraulic conductivity structure is a prerequisite for modeling contaminant transport. However, formulations of hydrogeological inverse problems utilizing hydrogeological data only often fail to reliably resolve features at a resolution required for accurately predicting transport. Incorporation of geophysical data into the inverse problem offers the potential to increase this resolution. In this study, we invert hydrological tracer test data using the shape and relative magnitude variations derived from geophysical tomographic data to regionalize a hydrogeological inverse problem in order to estimate the hydraulic conductivity structure. Our approach does not require that the petrophysical relationship be known a-priori, but that it is linear and stationary within each geophysical anomaly. However, tomograms are imperfect models of geophysical properties and geophysical properties are not necessarily strongly linked to hydraulic conductivity. Therefore, we focus on synthetic examples where the correlation between radar velocity and hydraulic conductivity, as well as the geophysical data acquisition errors, are varied in order to assess what aspects of the hydraulic conductivity structure we can expect to resolve under different conditions. The results indicate that regularization of the tracer inversion procedure using geophysical data improves estimates of hydraulic conductivity. We find that even under conditions of corrupted geophysical data, we can accurately estimate the effective hydraulic conductivity and areas of high and low hydraulic conductivity. However, given imperfect geophysical data, our results suggest that we cannot expect accurate estimates of the variability of the hydraulic conductivity structure.

  12. Isotopologues of dense gas tracers in NGC 1068

    Energy Technology Data Exchange (ETDEWEB)

    Wang, Junzhi; Qiu, Jianjie [Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, 200030, Shanghai (China); Zhang, Zhi-Yu [Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ (United Kingdom); Shi, Yong [School of Astronomy and Space Science, Nanjing University, Nanjing, 210093 (China); Zhang, Jiangshui [Center For Astrophysics, GuangZhou University, 510006, GuangZhou (China); Fang, Min, E-mail: jzwang@shao.ac.cn [ESO, Karl Schwarzschild Strasse 2, D-85748 Garching bei Munich (Germany)

    2014-11-20

    We present observations of isotopic lines of dense gas tracers toward the nuclear region of nearby Seyfert 2 galaxy NGC 1068 with the IRAM 30 m telescope and the Atacama Pathfinder Experiment (APEX) 12 m telescope. We detected four isotopic lines (H{sup 13}CN 1-0, H{sup 13}CO{sup +} 1-0, HN{sup 13}C 1-0, and HC{sup 18}O{sup +} 1-0) at the 3 mm band with the IRAM 30 m telescope and obtained upper limits of other lines. We calculated optical depths of dense gas tracers with the detected isotopic lines of HCN 1-0, HCO{sup +} 1-0, and HNC 1-0. We find that the {sup 14}N/{sup 15}N abundance ratio is greater than 420 if we adopt the upper limit of HC{sup 15}N(1-0) emission. Combining this with fluxes of 1-0 lines from IRAM 30 m observations and the upper limit of 3-2 lines from APEX 12 m observations, we also estimated the excitation condition of molecular gas in the nuclear region of NGC 1068, which is less dense than that in the extreme starburst regions of galaxies.

  13. Accurate blood flow measurements: are artificial tracers necessary?

    Directory of Open Access Journals (Sweden)

    Christian Poelma

    Full Text Available Imaging-based blood flow measurement techniques, such as particle image velocimetry, have become an important tool in cardiovascular research. They provide quantitative information about blood flow, which benefits applications ranging from developmental biology to tumor perfusion studies. Studies using these methods can be classified based on whether they use artificial tracers or red blood cells to visualize the fluid motion. We here present the first direct comparison in vivo of both methods. For high magnification cases, the experiments using red blood cells strongly underestimate the flow (up to 50% in the present case, as compared to the tracer results. For medium magnification cases, the results from both methods are indistinguishable as they give the same underestimation of the real velocities (approximately 33%, based on in vitro reference measurements. These results suggest that flow characteristics reported in literature cannot be compared without a careful evaluation of the imaging characteristics. A method to predict the expected flow averaging behavior for a particular facility is presented.

  14. Tracer Flux Balance at an Urban Canyon Intersection

    Science.gov (United States)

    Carpentieri, Matteo; Robins, Alan G.

    2010-05-01

    Despite their importance for pollutant dispersion in urban areas, the special features of dispersion at street intersections are rarely taken into account by operational air quality models. Several previous studies have demonstrated the complex flow patterns that occur at street intersections, even with simple geometry. This study presents results from wind-tunnel experiments on a reduced scale model of a complex but realistic urban intersection, located in central London. Tracer concentration measurements were used to derive three-dimensional maps of the concentration field within the intersection. In combination with a previous study (Carpentieri et al., Boundary-Layer Meteorol 133:277-296, 2009) where the velocity field was measured in the same model, a methodology for the calculation of the mean tracer flux balance at the intersection was developed and applied. The calculation highlighted several limitations of current state-of-the-art canyon dispersion models, arising mainly from the complex geometry of the intersection. Despite its limitations, the proposed methodology could be further developed in order to derive, assess and implement street intersection dispersion models for complex urban areas.

  15. Single well tracer method to evaluate enhanced recovery

    Science.gov (United States)

    Sheely, Jr., Clyde Q.; Baldwin, Jr., David E.

    1978-01-01

    Data useful to evaluate the effectiveness of or to design an enhanced recovery process (the recovery process involving mobilizing and moving hydrocarbons through a hydrocarbon-bearing subterranean formation from an injection well to a production well by injecting a mobilizing fluid into the injection well) are obtained by a process which comprises sequentially: determining hydrocarbon saturation in the formation in a volume in the formation near a well bore penetrating the formation, injecting sufficient of the mobilizing fluid to mobilize and move hydrocarbons from a volume in the formation near the well bore penetrating the formation, and determining by the single well tracer method a hydrocarbon saturation profile in a volume from which hydrocarbons are moved. The single well tracer method employed is disclosed by U.S. Pat. No. 3,623,842. The process is useful to evaluate surfactant floods, water floods, polymer floods, CO.sub.2 floods, caustic floods, micellar floods, and the like in the reservoir in much less time at greatly reduced costs, compared to conventional multi-well pilot test.

  16. Artificial sweeteners as potential tracers in groundwater in urban environments

    Science.gov (United States)

    Van Stempvoort, Dale R.; Roy, James W.; Brown, Susan J.; Bickerton, Greg

    2011-04-01

    SummaryThere is little information available on the prevalence of artificial sweeteners in groundwater, though these compounds may prove to be useful tracers of human wastewater, especially in urban settings with complex hydrology. In this study, the artificial sweetener acesulfame was detected in groundwater at all eight urban sites investigated (from five different urban areas in Canada), often at high concentrations (i.e., μg/L-scale). In a municipal wastewater plume at Jasper, Alberta, acesulfame was strongly correlated with chloride and was positively correlated with other wastewater-related contaminants indicating that this sweetener has potential to be a good tracer of young wastewater (artificial sweeteners were detected in urban groundwater: saccharin at six of the sites, sucralose at three sites, and cyclamate at five of seven sites where it was analyzed. The occurrence of sucralose may have been affected by its detection limit, which was much higher than for the other sweeteners. These results, and those of a parallel study, are the first reported detections of saccharin and cyclamate in groundwater, and suggest that these sweeteners may be more common than previously anticipated. In general, fewer samples from each site contained these other three sweeteners compared to acesulfame. At Barrie, Ontario, adjacent to an old landfill, the concentration of saccharin was higher than acesulfame in many samples. These results suggest that analyses of multiple sweeteners, rather than just acesulfame, may provide useful information on contaminant sources and groundwater conditions in urban settings. Further work is needed to address this potential use.

  17. Application of the results of pipe stress analyses into fracture mechanics defect analyses for welds of nuclear piping components; Uebernahme der Ergebnisse von Rohrsystemanalysen (Spannungsanalysen) fuer bruchmechanische Fehlerbewertungen fuer Schweissnaehte an Rohrleitungsbauteilen in kerntechnischen Anlagen

    Energy Technology Data Exchange (ETDEWEB)

    Dittmar, S.; Neubrech, G.E.; Wernicke, R. [TUeV Nord SysTec GmbH und Co.KG (Germany); Rieck, D. [IGN Ingenieurgesellschaft Nord mbH und Co.KG (Germany)

    2008-07-01

    For the fracture mechanical assessment of postulated or detected crack-like defects in welds of piping systems it is necessary to know the stresses in the un-cracked component normal to the crack plane. Results of piping stress analyses may be used if these are evaluated for the locations of the welds in the piping system. Using stress enhancing factors (stress indices, stress factors) the needed stress components are calculated from the component specific sectional loads (forces and moments). For this procedure the tabulated stress enhancing factors, given in the standards (ASME Code, German KTA regulations) for determination and limitation of the effective stresses, are not always and immediately adequate for the calculation of the stress component normal to the crack plane. The contribution shows fundamental possibilities and validity limits for adoption of the results of piping system analyses for the fracture mechanical evaluation of axial and circumferential defects in welded joints, with special emphasis on typical piping system components (straight pipe, elbow, pipe fitting, T-joint). The lecture is supposed to contribute to the standardization of a code compliant and task-related use of the piping system analysis results for fracture mechanical failure assessment. [German] Fuer die bruchmechanische Bewertung von postulierten oder bei der wiederkehrenden zerstoerungsfreien Pruefung detektierten rissartigen Fehlern in Schweissnaehten von Rohrsystemen werden die Spannungen in der ungerissenen Bauteilwand senkrecht zur Rissebene benoetigt. Hierfuer koennen die Ergebnisse von Rohrsystemanalysen (Spannungsanalysen) genutzt werden, wenn sie fuer die Orte der Schweissnaehte im Rohrsystem ausgewertet werden. Mit Hilfe von Spannungserhoehungsfaktoren (Spannungsindizes, Spannungsbeiwerten) werden aus den komponentenweise berechneten Schnittlasten (Kraefte und Momente) die benoetigten Spannungskomponenten berechnet. Dabei sind jedoch die in den Regelwerken (ASME

  18. Shaft barriers for underground waste repositories in abandoned salt mines. Preparatory project. Vol. 2. Annex; Schachtverschluesse fuer untertaegige Deponien in Salzbergwerken. Vorprojekt. Bd. 2. Anhang

    Energy Technology Data Exchange (ETDEWEB)

    Schmidt, M.W. [GSF - Forschungszentrum fuer Umwelt und Gesundheit, Remlingen (Germany). Forschungsbergwerk Asse; Fruth, R. [GSF - Forschungszentrum fuer Umwelt und Gesundheit, Remlingen (Germany). Forschungsbergwerk Asse; Stockmann, N. [GSF - Forschungszentrum fuer Umwelt und Gesundheit, Remlingen (Germany). Forschungsbergwerk Asse; Birthler, H. [Gesellschaft fuer Anlagen- und Reaktorsicherheit mbH Greece, Braunschweig (Germany). Fachbereich Endlagersicherheitsforschung; Boese, B. [Gesellschaft fuer Anlagen- und Reaktorsicherheit mbH Greece, Braunschweig (Germany). Fachbereich Endlagersicherheitsforschung; Storck, R. [Gesellschaft fuer Anlagen- und Reaktorsicherheit mbH Greece, Braunschweig (Germany). Fachbereich Endlagersicherheitsforschung; Sitz, P. [Technische Univ. Bergakademie Freiberg (Germany). Inst. fuer Bergbau; Krausse, A. [Technische Univ. Bergakademie Freiberg (Germany). Inst. fuer Bergbau; Eulenberger, K.H. [Technische Univ. Bergakademie Freiberg (Germany). Inst. fuer Bergbau; Schleinig, J.P. [Technische Univ. Bergakademie Freiberg (Germany). Inst. fuer Bergbau; Duddeck, H. [Technische Univ. Braunschweig (Germany). Inst. fuer Statik; Ahrens, H. [Technische Univ. Braunschweig (Germany). Inst. fuer Statik; Menzel, W. [IfG Inst. fuer Gebirgsmechanik GmbH, Leipzig (Germany); Salzer, K. [IfG Inst. fuer Gebirgsmechanik GmbH, Leipzig (Germany); Minkley, W. [IfG Inst. fuer Gebirgsmechanik GmbH, Leipzig (Germany); Busche, H. [Kali und Salz AG, Kassel (Germany); Lindloff, U. [Kali und Salz AG, Kassel (Germany); Gierenz, S. [Kali und Salz AG, Kassel (Germany)

    1995-12-31

    This preparatory study, ``Shaft barriers for underground waste repositories in abandoned salt mines``, was to demonstrate the current scientific and technological know-how based on a comprehensive analysis of the barrier design concepts or established structures intended to serve as barriers in abandoned shafts of potash or rock salt mines. Taking as a basis the current regulatory regime and the available know-how on barrier systems in underground waste repositories taken into account so far in plan approval and licensing procedures, as well as the state of the art, concepts are developed as technical guides and models of barrier systems for mine shafts. The required research work for the various components of a shaft barrier is shown, particularly relating to aspects such as materials suitability and technical realisation. Immediate demand for research activities is shown with regard to the available potentials of mathematic and numeric geotechnical and hydrogeologic calculation models required in order to give proof of the long-term workability of shaft barriers. The authors are of the opinion that the following activities are required in order to meet the research demand quantified: (1) Laboratory and bench-scale experiments for determination of the efficiency of various sealing materials and backfilling materials, and (2) an in-situ, large-scale experiment in order to demonstrate the suitability of low-consolidation shotter columns, or constructional technologies. The laboratory work can be done in the facilities of the GSF research mine of Asse, the Freiburg Mining Academy, and the Institut fuer Gebirgsmechanik in Leipzig, and the benchmark experiments also at the Asse site in the research mine. The Kali und Salz Beteiligungs AG is prepared to offer its mine Salzdetfurth II as a site for the large-scale experiment. (orig.) [Deutsch] Im Rahmen der Vorstudie ``Schachtverschluesse fuer Untertagedeponien in Salzbergwerken`` wird ausgehend von einer umfangreichen

  19. Forest report 2014 for Baden-Wuerttemberg; Waldzustandsbericht 2014 fuer Baden-Wuerttemberg

    Energy Technology Data Exchange (ETDEWEB)

    Meining, Stefan [Buero fuer Umweltueberwachung, Freiburg (Germany); Wilpert, Klaus v.; Schumacher, Joerg; Delb, Horst; Hartmann, Peter; Rubin, Lisa; John, Reinhold; Metzler, Berthold; Bublitz, Thomas [Forstliche Versuchs- und Forschungsanstalt Baden-Wuerttemberg, Freiburg im Breisgau (Germany); Augustin, Nicole [Bath Univ. (United Kingdom)

    2014-07-01

    The annual forest status report 2014 shows that the persistently high burdens have not fundamentally improved the health of the forests. In addition to significant improvements in soil conditions, which can be traced back to successful forest calcifications, climate change with its various impacts is a lasting burden on the forests. Unfortunately, the forest situation has deteriorated considerably compared to the previous year. With 42 per cent damaged trees, the third highest value has been reached since the start of the recordings about 3 years ago. This means that the medium-term trend towards the improvement of the forest state unfortunately does not continue. This is clearly evident in the crown condition as an important indicator of the health of the trees. The average needle / leaf loss of the trees has increased by 3.7 percentage points to 25.8 percent. The share of undamaged forest areas has fallen by nine percentage points to just 24 percent. These changes can be attributed to the very dry spring weather, the presence of harmful insects and a strong fruit formation. [German] Der jaehrliche Waldzustandsbericht 2014 zeigt, dass durch die unveraendert hohen Belastungen der Gesundheitszustand der Waelder sich nicht grundsaetzlich gebessert hat. Neben deutlichen Verbesserungen im Bodenzustand, die auf erfolgreiche Waldkalkungen zurueck zu fuehren sind, stellt insbesondere der Klimawandel mit seinen verschiedenen Auswirkungen eine dauerhafte Belastung der Waelder dar. Leider hat sich der Waldzustand gegenueber dem Vorjahr deutlich verschlechtert. Mit 42 Prozent geschaedigter Baeume wird der dritthoechste Wert seit Beginn der Aufnahmen vor rund 3 Jahren erreicht. Damit setzt sich der mittelfristige Trend zur Verbesserung des Waldzustandes leider nicht weiter fort. Beim Kronenzustand als wichtigem Indikator fuer den Gesundheitszustand der Baeume zeigt sich dies deutlich. Der mittlere Nadel-/Blattverlust der Baeume hat sich um 3,7 Prozentpunkte auf 25,8 Prozent

  20. CH as a Molecular Gas Tracer and C-shock Tracer Across a Molecular Cloud Boundary in Taurus

    Science.gov (United States)

    Xu, Duo; Li, Di

    2016-12-01

    We present new observations of all three ground-state transitions of the methylidyne (CH) radical and all four ground-state transitions of the hydroxyl (OH) radical toward a sharp boundary region of the Taurus molecular cloud. These data were analyzed in conjunction with existing CO and dust images. The derived CH abundance is consistent with previous observations of translucent clouds (0.8 ≤ A v ≤ 2.1 mag). The X(CH)-factor is nearly a constant (1.0 ± 0.06) × 1022 cm-2 K-1 km-1 s in this extinction range, with less dispersion than that of the more widely used molecular tracers CO and OH. CH turns out be a better tracer of total column density in such an intermediate extinction range than CO or OH. Compared with previous observations, CH is overabundant below 1 mag extinction. Such an overabundance of CH is consistent with the presence of a C-shock. CH has two kinematic components, one of which shifts from 5.3 to 6 km s-1, while the other stays at 6.8 km s-1 when moving from outside toward inside of the cloud. These velocity behaviors exactly match previous OH observation. The shifting of the two kinematic components indicates colliding streams or gas flow at the boundary region, which could be the cause of the C-shock.

  1. Identification of areas and time intervals for inservice inspections; Auswahl der Pruefbereiche und -intervalle fuer wiederkehrende Pruefungen

    Energy Technology Data Exchange (ETDEWEB)

    Metzner, K.J. [Preussische Elektrizitaets-AG (Preussenelektra), Hannover (Germany); Herter, K.H. [Stuttgart Univ. (Germany). Staatliche Materialpruefungsanstalt; Schoeckle, F. [Amtec Messtechnischer Service, Lauffen (Germany)

    1998-11-01

    von Schadensmechanismen), koennen die wiederkehrenden Pruefungen vorwiegend zielgerichtet hinsichtlich der Folgen dieser moeglichen Schadensmechanismen eingesetzt werden. Ist keine oder nur eine eingeschraenkte Ueberwachung vorhanden, sind die moeglichen Folgen eventuell bisher unbekannter Schadensmechanismen durch erweiterte und ggf. vagabundierende WKP-Massnahmen zu ueberpruefen. Fuer die Auswahl von Pruefbereichen und die Festlegung von Pruefintervallen ist die Verwendung der Auslegungsanalysen, in denen konservativ spezifizierte Belastungen und Lastfallhaeufigkeiten (fuer Betriebs- und Stoerfaelle) beruecksichtigt wurden, nicht geeignet. Es ist vielmehr von den `Ist-Beanspruchungen` aus dem bisherigen Betrieb in Verbindung mit der Kenntnis ueber die vorhandene `Istqualitaet` aus der Herstellung und der bisherigen Betriebszeit auszugehen. Die vorhandenen Unterlagen sind entsprechend aufzubereiten, so dass eine Grundlage fuer die Neubewertung der bisherigen ZfP-Massnahmen gegeben ist. (orig./MM)

  2. Tracer tests - possibilities and limitations. Experience from SKB fieldwork: 1977-2007

    Energy Technology Data Exchange (ETDEWEB)

    Loefgren, Martin; Crawford, James; Elert, Mark (Kemakta Konsult AB, Stockholm (SE))

    2007-09-15

    Tracer tests have played, and still play, a central role in investigations relating to the understanding of radionuclide retention processes in the field. At present there is a debate within the scientific community concerning how, and to what extent, tracer tests can be used to evaluate large-scale and long-term transport and retardation of radionuclides and other solutes of interest for Safety Assessment of repositories for spent nuclear fuel. In this report the SKB fieldwork on tracer tests performed at Swedish sites from 1977 to 2007 is described and discussed. Furthermore, the knowledge and process understanding evolved during the decades of radionuclide transport experiments and modelling within the SKB programme is summarised. One of the main objectives of this report is to discuss what data and knowledge can be extracted from different in situ tests in a robust fashion. Given the level of complexity associated with transport processes that may occur over the timescale of a tracer test, the utility of tracer tests is considered in the context of evidence-based interpretations of data which we characterise in the form of a sequence of questions of increasing complexity. The complexity of this sequence ranges from whether connection can be confirmed between injection and withdrawal points to whether quantitative data can be extrapolated from a tracer test to be subsequently used in Safety Assessment. The main findings of this report are that: Field scale tracer tests can confirm flow connectivity. Field scale tracer tests confirm the existence of retention. Field scale tracer tests alone can only broadly substantiate our process understanding. However, if performing extensive Site Characterisation and integrating the tracer test results with the full range of geoscientific information available, much support can be given to our process understanding. Field scale tracer tests can deliver the product of the material property group MPG and the F-factor, valid

  3. Technical Note: Coupling of chemical processes with the Modular Earth Submodel System (MESSy submodel TRACER

    Directory of Open Access Journals (Sweden)

    R. Sander

    2008-03-01

    Full Text Available The implementation of processes related to chemistry into Earth System Models and their coupling within such systems requires the consistent description of the chemical species involved. We provide a tool (written in Fortran95 to structure and manage information about constituents, hereinafter referred to as tracers, namely the Modular Earth Submodel System (MESSy generic (i.e., infrastructure submodel TRACER. With TRACER it is possible to define a multitude of tracer sets, depending on the spatio-temporal representation (i.e., the grid structure of the model. The required information about a specific chemical species is split into the static meta-information about the characteristics of the species, and its (generally in time and space variable abundance in the corresponding representation. TRACER moreover includes two submodels. One is TRACER_FAMILY, an implementation of the tracer family concept. It distinguishes between two types: type-1 families are usually applied to handle strongly related tracers (e.g., fast equilibrating species for a specific process (e.g., advection. In contrast to this, type-2 families are applied for tagging techniques. Tagging means the artificial decomposition of one or more species into parts, which are additionally labelled (e.g., by the region of their primary emission and then processed as the species itself. The type-2 family concept is designed to conserve the linear relationship between the family and its members. The second submodel is TRACER_PDEF, which corrects and budgets numerical negative overshoots that arise in many process implementations due to the numerical limitations (e.g., rounding errors. The submodel therefore guarantees the positive definiteness of the tracers and stabilises the integration scheme. As a by-product, it further provides a global tracer mass diagnostic. Last but not least, we present the submodel PTRAC, which allows the definition of tracers via a Fortran95 namelist, as a

  4. Simultaneous Analyses and Applications of Multiple Fluorobenzoate and Halide Tracers in Hydrologic Studies

    Energy Technology Data Exchange (ETDEWEB)

    Hu, Q; Moran, J E

    2004-01-22

    An analytical method that employs ion chromatography has been developed to more fully exploit the use of fluorobenzoic acids (FBAs) and halides as hydrologic tracers. In a single run, this reliable, sensitive, and robust method can simultaneously separate and quantify halides (fluoride, chloride, bromide, and iodide) and up to seven FBAs from other common groundwater constituents (e.g., nitrate and sulfate). The usefulness of this ion chromatographic (IC) analytical method is demonstrated in both field and laboratory tracer experiments. Field experiments in unsaturated tuff featuring fractures or a fault show that this efficient and cost-effective method helps achieve the objectives of tracer studies that use multiple FBAs and/or diffusivity tracers (simultaneous use of one or more FBA and halide). The field study examines the hydrologic response of fractures and the matrix to different flow rates and the contribution of matrix diffusion in chemical transport. Laboratory tracer experiments with eight geologic media from across the United States--mostly from Department of Energy facilities where groundwater contamination is prevalent and where subsurface characterization employing tracers has been ongoing or is in need--reveal several insights about tracer transport behavior: (1) Bromide and FBAs are not always transported conservatively. (2) The delayed transport of these anionic tracers is likely related to geologic media characteristics, such as organic matter, pH, iron oxide content, and clay mineralogy. (3) Any use of iodine as a hydrologic tracer should take into account the different sorption behaviors of iodide and iodate and the possible conversion of iodine's initial chemical form. (4) The transport behavior of potential FBA and halide tracers under relevant geochemical conditions should be evaluated before beginning ambitious, large-scale field tracer experiments.

  5. Simultaneous Analyses and Applications of Multiple Fluorobenzoate and Halide Tracers in Hydrologic Studies

    Energy Technology Data Exchange (ETDEWEB)

    Hu, Q; Moran, J E

    2004-01-22

    An analytical method that employs ion chromatography has been developed to more fully exploit the use of fluorobenzoic acids (FBAs) and halides as hydrologic tracers. In a single run, this reliable, sensitive, and robust method can simultaneously separate and quantify halides (fluoride, chloride, bromide, and iodide) and up to seven FBAs from other common groundwater constituents (e.g., nitrate and sulfate). The usefulness of this ion chromatographic (IC) analytical method is demonstrated in both field and laboratory tracer experiments. Field experiments in unsaturated tuff featuring fractures or a fault show that this efficient and cost-effective method helps achieve the objectives of tracer studies that use multiple FBAs and/or diffusivity tracers (simultaneous use of one or more FBA and halide). The field study examines the hydrologic response of fractures and the matrix to different flow rates and the contribution of matrix diffusion in chemical transport. Laboratory tracer experiments with eight geologic media from across the United States--mostly from Department of Energy facilities where groundwater contamination is prevalent and where subsurface characterization employing tracers has been ongoing or is in need--reveal several insights about tracer transport behavior: (1) Bromide and FBAs are not always transported conservatively. (2) The delayed transport of these anionic tracers is likely related to geologic media characteristics, such as organic matter, pH, iron oxide content, and clay mineralogy. (3) Any use of iodine as a hydrologic tracer should take into account the different sorption behaviors of iodide and iodate and the possible conversion of iodine's initial chemical form. (4) The transport behavior of potential FBA and halide tracers under relevant geochemical conditions should be evaluated before beginning ambitious, large-scale field tracer experiments.

  6. Campaigns for renewable energy - the evaluation of 'Solar-na klar.' and a framework concept for new campaigns; Kampagnen fuer erneuerbare Energien - Die Evaluation von 'Solar-na klar.' und Empfehlungen fuer neue Kampagnen

    Energy Technology Data Exchange (ETDEWEB)

    Duscha, M.; Schuele, R.; Gross, D.; Lambrecht, K.; Lucius, W.; Johansson, J.; Rieder, S.

    2002-04-01

    , localized relevant target groups and condensed recent image studies about renewable energies in Germany. As a result, the report details the main elements and conditions that are necessary for campaigns that cover all types of renewable energies, such campaigns are supported in principal by all stakeholder groups. (orig.) [German] (a) Die Kampagne 'Solar - na klar.' unterstuetzt seit 1999 eine verstaerkte Verbreitung von solarthermischen Anlagen durch vielfaeltige Oeffentlichkeitsarbeit und Dienstleistungen. Die Evaluation der Kampagne kam bezueglich der externen Wirkungen zu ueberwiegend positiven Ergebnissen: Die zentralen Zielgruppen, Handwerker und der Ein-/Zweifamilienhausbesitzer, wurden durch die Kampagne gut erreicht und mit gutem Informationsmaterial angesprochen. Darueber hinaus schaetzte ca. ein Viertel der Haushalte, die eine solarthermische Anlage installierten, den Einfluss der Kampagne eher hoch ein. Allerdings vermissten die Haushalte zum Teil weiterfuehrende Informationen. Auch die befragten Handwerker aeusserten eine relativ grosse Zufriedenheit mit der Kampagne. Sie nutzten die bereitgestellten Informationsmaterialien der Kampagne jedoch nur sehr selten. Die Evaluation der internen Grundlagen und Prozesse fuehrt zu ambivalenten Ergebnissen: Beispielsweise ist es der Kampagne auf der einen Seite gelungen, eine breite und heterogene Traegerschaft zu gewinnen und flexibel auf aeussere Anforderungen zu reagieren. Auf der anderen Seite stellten sich Probleme in der Steuerung und im Konfliktmanagement ein. Hierzu trugen u.a. eine nicht ausreichend integrierte Projektplanung sowie strukturelle Unterschiede zwischen den Partnern bei. Die Evaluation muendet in der zentralen Empfehlung, die Kampagne in modififizierter Form fortzusetzen. Verbesserungsmoeglichkeiten sehen die Evaluatoren u.a. in der verstaerkten Einbindung regionaler Aktvitaeten. (b) Als Grundlage fuer die Empfehlungen fuer weitere Kampagnen fuer erneuerbare Energien analysierte das ifeu

  7. Amended EC Directive on the limitation of emissions of certain pollutants into the air from large combustion plants. Implications for German power plants; Neue EG-Richtlinie fuer Grossfeuerungsanlagen. Folgerungen fuer deutsche Kraftwerke

    Energy Technology Data Exchange (ETDEWEB)

    Hildebrand, M. [Verband der Elektrizitaetswirtschaft - VDEW - e.V., Frankfurt (Germany). Bereich Recht und Umwelt

    2002-03-11

    The article highlights the major improvements in terms of reducing emissions from large combustion plants, comparing the new limiting values and specifications with those of the former Directive. As Germany is obliged to transform the new EC Directive into national law within twelve months from its entry into force, an amendment of the respective German regulation can be expected soon. (orig./CB) [German] Mit der im Herbst 2001 durch das Europaeische Parlament und den Umweltministerrat verabschiedeten Novelle der Grossfeuerungsanlagen-Richtlinie hat die Europaeische Union einen markanten, laengst ueberfaelligen Schritt zur EU-weiten Angleichung der emissionsseitigen Anforderungen an grosse Feuerungsanlagen unternommen. Mit dem Inkrafttreten der novellierten Grossfeuerungsanlagen-Richtlinie wurde aber auch der formale Anstoss fuer eine Aktualisierung der deutschen Grossfeuerungsanlagen-Verordnung (13.BImSchV) gegeben. (orig./CB)

  8. Regional Groundwater Processes and Flow Dynamics from Age Tracer Data

    Science.gov (United States)

    Morgenstern, Uwe; Stewart, Mike K.; Matthews, Abby

    2016-04-01

    Age tracers are now used in New Zealand on regional scales for quantifying the impact and lag time of land use and climate change on the quantity and quality of available groundwater resources within the framework of the National Policy Statement for Freshwater Management 2014. Age tracers provide measurable information on the dynamics of groundwater systems and reaction rates (e.g. denitrification), essential for conceptualising the regional groundwater - surface water system and informing the development of land use and groundwater flow and transport models. In the Horizons Region of New Zealand, around 200 wells have tracer data available, including tritium, SF6, CFCs, 2H, 18O, Ar, N2, CH4 and radon. Well depths range from shallower wells in gravel aquifers in the Horowhenua and Tararua districts, and deeper wells in the aquifers between Palmerston North and Wanganui. Most of the groundwater samples around and north of the Manawatu River west of the Tararua ranges are extremely old (>100 years), even from relatively shallow wells, indicating that these groundwaters are relatively disconnected from fresh surface recharge. The groundwater wells in the Horowhenua tap into a considerably younger groundwater reservoir with groundwater mean residence time (MRT) of 10 - 40 years. Groundwater along the eastern side of the Tararua and Ruahine ranges is significantly younger, typically groundwater recharge rates, as deduced from groundwater depth and MRT, are extremely low in the central coastal area, consistent with confined groundwater systems, or with upwelling of old groundwater close to the coast. Very low vertical recharge rates along the Manawatu River west of the Manawatu Gorge indicate upwelling groundwater conditions in this area, implying groundwater discharge into the river is more likely here than loss of river water into the groundwater system. High recharge rates observed at several wells in the Horowhenua area and in the area east of the Tararua and

  9. ATTILA - Atmospheric Tracer Transport In a Langrangian Model

    Energy Technology Data Exchange (ETDEWEB)

    Reithmeier, C.; Sausen, R.

    2000-07-01

    The Lagrangian model ATTILA (atmospheric tracer transport in a Lagrangian model) has been developed to treat the global-scale transport of passive trace species in the atmosphere within the framework of a general circulation model (GCM). ATTILA runs online within the GCM ECHAM4 and uses the GCM produced wind field to advect the centrois of 80.000 to 180.000 constant mass air parcels into which the model atmosphere is divided. Each trace constituent is thereby represented by a mass mixing ratio in each parcel. ATTILA contains state-of-the-art parameterizations of convection, turbulent boundary layer mixing, and interparcel transport and provides an algorithm to map the tracer concentrations from the trajectories to the ECHAM model grid. We use two experiments to evaluate the transport characteristics of ATTILA against observations and the standard semiLagrangian transport scheme of ECHAM. In the first experiment we simulate the distribution of the short-lived tracer Radon ({sup 222}Rn) in order to examine fast vertical transport over continents, and long-range transport from the continents to remote areas. In the second experiment, we simulate the distribution of radiocarbon ({sup 14}C) that was injected into the northern stratosphere during the nuclear weapon tests in the early 60ties, in order to examine upper tropospheric and stratospheric transport characteristics. ATTILA compares well to the observations and in many respects to the semiLagrangian scheme. However, contrary to the semiLagrangian scheme, ATTILA shows a greatly reduced meridional transport in the upper troposphere and lower stratosphere, and a reduced downward flux from the stratosphere to the troposphere, especially in midlatitudes. Since both transport schemes use the same model meteorology, we conclude that the often cited enhanced meridional transport and overestimated downward flux in ECHAM as described above is rather due to the numerical properties of the semiLagrangian scheme than due to an

  10. ATTILA - Atmospheric Tracer Transport In a Langrangian Model

    Energy Technology Data Exchange (ETDEWEB)

    Reithmeier, C.; Sausen, R.

    2000-07-01

    The Lagrangian model ATTILA (atmospheric tracer transport in a Lagrangian model) has been developed to treat the global-scale transport of passive trace species in the atmosphere within the framework of a general circulation model (GCM). ATTILA runs online within the GCM ECHAM4 and uses the GCM produced wind field to advect the centrois of 80.000 to 180.000 constant mass air parcels into which the model atmosphere is divided. Each trace constituent is thereby represented by a mass mixing ratio in each parcel. ATTILA contains state-of-the-art parameterizations of convection, turbulent boundary layer mixing, and interparcel transport and provides an algorithm to map the tracer concentrations from the trajectories to the ECHAM model grid. We use two experiments to evaluate the transport characteristics of ATTILA against observations and the standard semiLagrangian transport scheme of ECHAM. In the first experiment we simulate the distribution of the short-lived tracer Radon ({sup 222}Rn) in order to examine fast vertical transport over continents, and long-range transport from the continents to remote areas. In the second experiment, we simulate the distribution of radiocarbon ({sup 14}C) that was injected into the northern stratosphere during the nuclear weapon tests in the early 60ties, in order to examine upper tropospheric and stratospheric transport characteristics. ATTILA compares well to the observations and in many respects to the semiLagrangian scheme. However, contrary to the semiLagrangian scheme, ATTILA shows a greatly reduced meridional transport in the upper troposphere and lower stratosphere, and a reduced downward flux from the stratosphere to the troposphere, especially in midlatitudes. Since both transport schemes use the same model meteorology, we conclude that the often cited enhanced meridional transport and overestimated downward flux in ECHAM as described above is rather due to the numerical properties of the semiLagrangian scheme than due to an

  11. A Systematic Approach for Developing Bacteria-Specific Imaging Tracers.

    Science.gov (United States)

    Ordonez, Alvaro A; Weinstein, Edward A; Bambarger, Lauren E; Saini, Vikram; Chang, Yong S; DeMarco, Vincent P; Klunk, Mariah H; Urbanowski, Michael E; Moulton, Kimberly L; Murawski, Allison M; Pokkali, Supriya; Kalinda, Alvin S; Jain, Sanjay K

    2017-01-01

    The modern patient is increasingly susceptible to bacterial infections including those due to multidrug-resistant organisms (MDROs). Noninvasive whole-body analysis with pathogen-specific imaging technologies can significantly improve patient outcomes by rapidly identifying a source of infection and monitoring the response to treatment, but no such technology exists clinically. We systematically screened 961 random radiolabeled molecules in silico as substrates for essential metabolic pathways in bacteria, followed by in vitro uptake in representative bacteria-Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and mycobacteria. Fluorine-labeled analogs, that could be developed as PET-based imaging tracers, were evaluated in a murine myositis model. We identified 3 novel, nontoxic molecules demonstrating selective bacterial uptake: para-aminobenzoic acid (PABA), with uptake in all representative bacteria including Mycobacterium tuberculosis; mannitol, with selective uptake in S. aureus and E. coli; and sorbitol, accumulating only in E. coli None accumulated in mammalian cells or heat-killed bacteria, suggesting metabolism-derived specificity. In addition to an extended bacterial panel of laboratory strains, all 3 molecules rapidly accumulated in respective clinical isolates of interest including MDROs such as methicillin-resistant S. aureus, extended-spectrum β-lactamase-producing, and carbapenem-resistant Enterobacteriaceae. In a murine myositis model, fluorine-labeled analogs of all 3 molecules could rapidly detect and differentiate infection sites from sterile inflammation in mice (P = 0.03). Finally, 2-deoxy-2-[F-18]fluoro-d-sorbitol ((18)F-FDS) can be easily synthesized from (18)F-FDG. PET, with (18)F-FDS synthesized using current good manufacturing practice, could rapidly differentiate true infection from sterile inflammation to selectively localize E. coli infection in mice. We have developed a systematic approach that exploits unique

  12. Chair in open-cast and international mining at the Institute for Mining at Clausthal Technological University; Lehrstuhl fuer Tagebau und Internationaler Bergbau am Institut fuer Bergbau der TU Clausthal

    Energy Technology Data Exchange (ETDEWEB)

    Tudeshki, H.; Hardebusch, T. [Lehrstuhl fuer Tagebau und Internationaler Bergbau am Institut fuer Bergbau, TU Clausthal-Zellerfeld (Germany)

    2002-12-05

    The range of activities of the Chair in Open-cast and International Mining at the Institute for Mining at Clausthal Technological University currently comprises the field of teaching and further scientific training, research and development as well as transfer of knowledge and technology. In addition to these legally sanctioned activities PR work concerning the necessity for the mining of mineral raw materials and the associated training of mining engineers plays a central role. In accordance with the fundamental idea that a prerequisite for good training in the field of engineering science is a close link between university and industry the contents of the courses are always adapted to the state of the art in the mining industry and the main areas of research based on practical requirements. In accordance with this process current aspects of the safeguarding of raw materials, sustenance and management of knowledge in the mining industry are integrated in these courses. The current research work is interdisciplinary and deals with quality management, deposit protection, recultivation and rehabilitation as well as reduction of emissions. (orig.) [German] Das Aufgabenspektrum des Lehrstuhls fuer Tagebau und Internationalen Bergbau am Institut fuer Bergbau der TU Clausthal umfasst die Gebiete Lehre und wissenschaftliche Weiterbildung, Forschung und Entwicklung sowie Wissens- und Technologietransfer. Ueber diese gesetzlich verankerten Aufgaben hinaus nimmt die PR-Arbeit ueber die Notwendigkeit bergmaennischer Gewinnung mineralischer Rohstoffe und der damit einhergehenden Ausbildung von Bergbauingenieuren eine zentrale Stellung ein. Dem Leitgedanken folgend, dass eine gute Ausbildung im ingenieurwissenschaftlichen Bereich eine enge Verbindung zwischen Hochschule und Industrie voraussetzt, werden die Lehrinhalte stets dem Stand der Technik im Bergbau angepasst und die Forschungsschwerpunkte praxisbezogen abgeleitet. Diesem Prozess folgend wurden aktuell Aspekte der

  13. Tracer-/Heat transfer decoupling in a heterogenous, fault zone based hydrothermal reservoir in the Upper Rhine Basin; Tracer-/Waermetrnasportentkopplung in einem heterogenen, stoerungszonengepraegten Hydrothermalreservoir im Oberrheingraben

    Energy Technology Data Exchange (ETDEWEB)

    Ghergut, I.; Licha, T.; Maier, F.; Nottebohm, M.; Sauter, M. [Goettingen Univ. (Germany). Abt. Angewandte Geologie; Meixner, J.; Rettenmaier, D. [Karlsruher Institut fuer Technologie (KIT) (Germany). Abt. Hydrogeologie

    2012-10-16

    Heat transport processes and tracer transport processes probe the boundaries of a tracer based prognosis of the thermal lifetime for a geothermal borehole doublet in a heterogeneous hydrothermal reservoir in the Upper Rhine Basin whose behaviour is characterized by two or three large-scale not bored fault zones. A hydro-geologic structure model of the reservoir is the fundament for the identification of decisive fluid transport processes. The thermal breakdown is a rather abstract threatening with a large time distance for the geothermal borehole doublet. Nearby dangers of hydro-geochemical and hydro-mechanical nature require tracer tests for their quantification. Long dwell times are expected in a circulation test, while interpretation difficulties are expected in early tracer signals. Heat-push-shut-in tests or tracer-push-flowback tests at the geothermal re-injection drilling can supply information on transport effective aquifer parameters in an even more appropriate time. A fluid transport based characterization of the fault zones is only imaginable by means of long-term circulation tests with conservative and thermo-sensitive tracers.

  14. Size dependence of tracer diffusion in a laponite colloidal gel.

    Science.gov (United States)

    Petit, Laure; Barentin, Catherine; Colombani, Jean; Ybert, Christophe; Bocquet, Lydéric

    2009-10-20

    Using a fluorescence recovery after photobleaching (FRAP) technique, we present measurements of probe diffusion in a colloidal glass-a Laponite suspension. By varying the probe size over 2 orders of magnitude, as well as the concentration of the colloidal glass, we evidence and quantify the deviations of the probe diffusivity from the bulk Stokes-Einstein expectations. These experiments suggest that the probe diffusion in the dynamically arrested Laponite structure is mainly controlled by the ratio between the probe size and the typical clay platelets interdistance. Comparing with a simple hindered diffusion mechanism, the reduction of tracer diffusion is discussed in terms of the hydrodynamic interaction of the probe with the Laponite structure. Finally, these results can be interpreted in terms of a scale dependent viscosity of the colloidal glass.

  15. Aviation Fuel Tracer Simulation: Model Intercomparison and Implications

    Science.gov (United States)

    Danilin, M. Y.; Fahey, D. W.; Schumann, U.; Prather, M. J.; Penner, J. E.; Ko, M. K. W.; Weisenstein, D. K.; Jackman, C. H.; Pitari, G.; Koehler, I.; Sausen, R.; Weaver, C. J.; Douglass, A. R.; Connell, P. S.; Kinnison, D. E.; Dentener, F. J.; Fleming, E. L.; Berntsen, T. K.; Isaksen, I. S. A.

    1998-01-01

    An upper limit for aircraft-produced perturbations to aerosols and gaseous exhaust products in the upper troposphere and lower stratosphere (UT/LS) is derived using the 1992 aviation fuel tracer simulation performed by eleven global atmospheric models. Key findings are that subsonic aircraft emissions: (1) have not been responsible for the observed water vapor trends at 40degN; (2) could be a significant source of soot mass near 12 km, but not at 20 km; (3) might cause a noticeable increase in the background sulfate aerosol surface area and number densities (but not mass density) near the northern mid-latitude tropopause; and (4) could provide a global, annual mean top of the atmosphere radiative forcing up to +0.006 W/sq m and -0.013 W/sq m due to emitted soot and sulfur, respectively.

  16. A comparison of SLAM and SCIPUFF using SEADEX tracer data

    Energy Technology Data Exchange (ETDEWEB)

    Atchison, M.K.

    1999-07-01

    The transport and diffusion models SCIPUFF (Second-order Closure Integrated Puff) and SLAM (Short-range Layered Atmospheric Model) were compared against each other using the land-sea breeze tracer data set SEADEX (The Shoreline Environment Atmospheric Dispersion Experiment). Predicted concentrations from both of these models were compared to observed concentrations at distances up to 15 km from a source for two of nine SEADEX releases. Emphasis was placed on a comparison of model output produced using various types of weather data (surface and upper-air). For the SEADEX release 1, SLAM was better at predicting the peak concentrations while SCIPUFF did a better job of predicting the overall plume widths. For SEADEX release 6, both SCIPUFF and SLAM performed similarly. However, SLAM moved the plume too fast compared to SCIPUFF and the actual observed plume location.

  17. Tracer Diffusion of Polystyrene in Lightly Sulfonated Polystyrene

    Science.gov (United States)

    Xu, Chen; Zhou, Nancy; Burghardt, Wesley; Winey, Karen; Composto, Russell

    2005-03-01

    The tracer diffusion coefficient D^* of deuterated polystyrene (d-PS) (Mw = 65,900 g/mol) in lightly sulfonated polystyrene (P(S-SSx)) (Mw = 65,000 g/mol) as a function of sulfonation mole fraction (x) was measured by forward recoil spectrometry (FRES). For x sulfonation, according to D^* = Do exp(-0.14 Ns), where Ns is the number of sulfuric acid groups per chain. This slowing-down is attributed to an increase in the monomeric friction coefficient which increases with sulfonation. The diffusion mechanism includes both reptation and constraint release. The monomeric friction coefficient for d-PS in P(S-SSx) is compared with the coefficient for P(S-SSx) measured by rheology.

  18. Reintegration of child soldiers in Burundi: a tracer study.

    Science.gov (United States)

    Jordans, Mark J D; Komproe, Ivan H; Tol, Wietse A; Ndayisaba, Aline; Nisabwe, Theodora; Kohrt, Brandon A

    2012-10-25

    Substantial attention and resources are aimed at the reintegration of child soldiers, yet rigorous evaluations are rare. This tracer study was conducted among former child soldiers (N=452) and never-recruited peers (N=191) who participated in an economic support program in Burundi. Socio-economic outcome indicators were measured retrospectively for the period before receiving support (T1; 2005-06); immediately afterwards (T2; 2006-07); and at present (T3; 2010). Participants also rated present functional impairment and mental health indicators. Participants reported improvement on all indicators, especially economic opportunity and social integration. At present no difference existed between both groups on any of the outcome indicators. Socio-economic functioning was negatively related with depression- and, health complaints and positively with intervention satisfaction. The present study demonstrates promising reintegration trajectories of former child soldiers after participating in a support program.

  19. Reintegration of child soldiers in Burundi: a tracer study

    Directory of Open Access Journals (Sweden)

    Jordans Mark JD

    2012-10-01

    Full Text Available Abstract Background Substantial attention and resources are aimed at the reintegration of child soldiers, yet rigorous evaluations are rare. Methods This tracer study was conducted among former child soldiers (N=452 and never-recruited peers (N=191 who participated in an economic support program in Burundi. Socio-economic outcome indicators were measured retrospectively for the period before receiving support (T1; 2005–06; immediately afterwards (T2; 2006–07; and at present (T3; 2010. Participants also rated present functional impairment and mental health indicators. Results Participants reported improvement on all indicators, especially economic opportunity and social integration. At present no difference existed between both groups on any of the outcome indicators. Socio-economic functioning was negatively related with depression- and, health complaints and positively with intervention satisfaction. Conclusion The present study demonstrates promising reintegration trajectories of former child soldiers after participating in a support program.

  20. Reintegration of child soldiers in Burundi: a tracer study

    Science.gov (United States)

    2012-01-01

    Background Substantial attention and resources are aimed at the reintegration of child soldiers, yet rigorous evaluations are rare. Methods This tracer study was conducted among former child soldiers (N=452) and never-recruited peers (N=191) who participated in an economic support program in Burundi. Socio-economic outcome indicators were measured retrospectively for the period before receiving support (T1; 2005–06); immediately afterwards (T2; 2006–07); and at present (T3; 2010). Participants also rated present functional impairment and mental health indicators. Results Participants reported improvement on all indicators, especially economic opportunity and social integration. At present no difference existed between both groups on any of the outcome indicators. Socio-economic functioning was negatively related with depression- and, health complaints and positively with intervention satisfaction. Conclusion The present study demonstrates promising reintegration trajectories of former child soldiers after participating in a support program. PMID:23095403

  1. Quantitative observation of tracer transport with high-resolution PET

    Science.gov (United States)

    Kulenkampff, Johannes; Gruendig, Marion; Zakhnini, Abdelhamid; Lippmann-Pipke, Johanna

    2016-04-01

    Transport processes in natural porous media are typically heterogeneous over various scales. This heterogeneity is caused by the complexity of pore geometry and molecular processes. Heterogeneous processes, like diffusive transport, conservative advective transport, mixing and reactive transport, can be observed and quantified with quantitative tomography of tracer transport patterns. Positron Emission Tomography (PET) is by far the most sensitive method and perfectly selective for positron-emitting radiotracers, therefore it is suited as reference method for spatiotemporal tracer transport observations. The number of such PET-applications is steadily increasing. However, many applications are afflicted by the low spatial resolution (3 - 5 mm) of the clinical scanners from cooperating nuclear medical departments. This resolution is low in relation to typical sample dimensions of 10 cm, which are restricted by the mass attenuation of the material. In contrast, our GeoPET-method applies a high-resolution scanner with a resolution of 1 mm, which is the physical limit of the method and which is more appropriate for samples of the size of soil columns or drill cores. This higher resolution is achieved at the cost of a more elaborate image reconstruction procedure, especially considering the effects of Compton scatter. The result of the quantitative image reconstruction procedure is a suite of frames of the quantitative tracer distribution with adjustable frame rates from minutes to months. The voxel size has to be considered as reference volume of the tracer concentration. This continuous variable includes contributions from structures far below the spatial resolution, as far as a detection threshold, in the pico-molar range, is exceeded. Examples from a period of almost 10 years (Kulenkampff et al. 2008a, Kulenkampff et al. 2008b) of development and application of quantitative GeoPET-process tomography are shown. These examples include different transport processes

  2. SPHRAY: A Smoothed Particle Hydrodynamics Ray Tracer for Radiative Transfer

    CERN Document Server

    Altay, Gabriel; Pelupessy, Inti

    2008-01-01

    We introduce SPHRAY, a Smoothed Particle Hydrodynamics (SPH) ray tracer designed to solve the 3D, time dependent, radiative transfer (RT) equations for arbitrary density fields. The SPH nature of SPHRAY makes the incorporation of separate hydrodynamics and gravity solvers very natural. SPHRAY relies on a Monte Carlo (MC) ray tracing scheme that does not interpolate the SPH particles onto a grid but instead integrates directly through the SPH kernels. Given initial conditions and a description of the sources of ionizing radiation, the code will calculate the non-equilibrium ionization state (HI, HII, HeI, HeII, HeIII, e) and temperature (internal energy/entropy) of each SPH particle. The sources of radiation can include point like objects, diffuse recombination radiation, and a background field from outside the computational volume. The MC ray tracing implementation allows for the quick introduction of new physics and is parallelization friendly. A quick Axis Aligned Bounding Box (AABB) test taken from compute...

  3. Planetary nebulae as kinematic tracers of galaxy stellar halos

    CERN Document Server

    Coccato, Lodovico

    2016-01-01

    The kinematic and dynamical properties of galaxy stellar halos are difficult to measure because of the faint surface brightness that characterizes these regions. Spiral galaxies can be probed using the radio HI emission; on the contrary, early-type galaxies contain less gas, therefore alternative kinematic tracers need to be used. Planetary nebulae (PNe) can be easily detected far out in the halo thanks to their bright emission lines. It is therefore possible to map the halo kinematics also in early-type galaxies, typically out to 5 effective radii or beyond. Thanks to the recent spectroscopic surveys targeting extra-galactic PNe, we can now rely on a few tens of galaxies where the kinematics of the stellar halos are measured. Here, I will review the main results obtained in this field in the last decades.

  4. Quantifying Methane Fluxes Simply and Accurately: The Tracer Dilution Method

    Science.gov (United States)

    Rella, Christopher; Crosson, Eric; Green, Roger; Hater, Gary; Dayton, Dave; Lafleur, Rick; Merrill, Ray; Tan, Sze; Thoma, Eben

    2010-05-01

    Methane is an important atmospheric constituent with a wide variety of sources, both natural and anthropogenic, including wetlands and other water bodies, permafrost, farms, landfills, and areas with significant petrochemical exploration, drilling, transport, or processing, or refining occurs. Despite its importance to the carbon cycle, its significant impact as a greenhouse gas, and its ubiquity in modern life as a source of energy, its sources and sinks in marine and terrestrial ecosystems are only poorly understood. This is largely because high quality, quantitative measurements of methane fluxes in these different environments have not been available, due both to the lack of robust field-deployable instrumentation as well as to the fact that most significant sources of methane extend over large areas (from 10's to 1,000,000's of square meters) and are heterogeneous emitters - i.e., the methane is not emitted evenly over the area in question. Quantifying the total methane emissions from such sources becomes a tremendous challenge, compounded by the fact that atmospheric transport from emission point to detection point can be highly variable. In this presentation we describe a robust, accurate, and easy-to-deploy technique called the tracer dilution method, in which a known gas (such as acetylene, nitrous oxide, or sulfur hexafluoride) is released in the same vicinity of the methane emissions. Measurements of methane and the tracer gas are then made downwind of the release point, in the so-called far-field, where the area of methane emissions cannot be distinguished from a point source (i.e., the two gas plumes are well-mixed). In this regime, the methane emissions are given by the ratio of the two measured concentrations, multiplied by the known tracer emission rate. The challenges associated with atmospheric variability and heterogeneous methane emissions are handled automatically by the transport and dispersion of the tracer. We present detailed methane flux

  5. Individual Tracer Atoms in an Ultracold Dilute Gas.

    Science.gov (United States)

    Hohmann, Michael; Kindermann, Farina; Lausch, Tobias; Mayer, Daniel; Schmidt, Felix; Lutz, Eric; Widera, Artur

    2017-06-30

    We report on the experimental investigation of individual Cs atoms impinging on a dilute cloud of ultracold Rb atoms with variable density. We study the relaxation of the initial nonthermal state and detect the effect of single collisions which has so far eluded observation. We show that, after few collisions, the measured spatial distribution of the tracer atoms is correctly described by a Langevin equation with a velocity-dependent friction coefficient, over a large range of Knudsen numbers. Our results extend the simple and effective Langevin treatment to the realm of light particles in dilute gases. The experimental technique developed opens up the microscopic exploration of a novel regime of diffusion at the level of individual collisions.

  6. Data summary of 1985 SF sub 6 tracer experiments at Andorra (Teruel) power plant

    Energy Technology Data Exchange (ETDEWEB)

    Sivertsen, B.; Irwin, J.S.

    1987-01-01

    The results from tracer experiments carried out at the Teruel power plant in Spain are presented. Tracer data have been used to present concentration distributions, SO{sub 2} rates and to indicate future measurement locations. The position, extent and area of high SO{sub 2} concentrations are presented. A follow-up program is also indicated. 13 refs., 20 figs., 8 tabs.

  7. Probability Distribution Function of a Forced Passive Tracer in the Lower Stratosphere

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    The probability distribution function (PDF) of a passive tracer, forced by a "mean gradient", is studied. First, we take two theoretical approaches, the Lagrangian and the conditional closure formalisms, to study the PDFs of such an externally forced passive tracer. Then, we carry out numerical simulations for an idealized random flow on a sphere and for European Center for Medium-Range Weather Forecasts (ECMWF) stratospheric winds to test whether the mean-gradient model can be applied to studying stratospheric tracer mixing in midlatitude surf zones, in which a weak and poleward zonal-mean gradient is maintained by tracer leakage through polar and tropical mixing barriers, and whether the PDFs of tracer fluctuations in midlatitudes are consistent with the theoretical predictions. The numerical simulations show that when diffusive dissipation is balanced by the mean-gradient forcing, the PDF in the random flow and the Southern-Hemisphere PDFs in ECMWF winds show time-invariant exponential tails, consistent with theoretical predictions. In the Northern Hemisphere, the PDFs exhibit non-Gaussian tails. However, the PDF tails are not consistent with theoretical expectations. The long-term behavior of the PDF tails of the forced tracer is compared to that of a decaying tracer. It is found that the PDF tails of the decaying tracer are time-dependent, and evolve toward flatter than exponential.

  8. Use of stable isotope-labeled Escherichia coli as a tracer in karst aquifers

    Science.gov (United States)

    Bacterial contamination of karst aquifers is a large concern across the globe, yet bacterial transport in karst aquifers is not currently well understood. Groundwater tracers typically used in karst systems include fluorescent dyes and latex microspheres. Not only can these tracers can be cost-prohi...

  9. A forced-gradient tracer test on the Hansrivier Dyke: Beaufort West ...

    African Journals Online (AJOL)

    2011-02-16

    Feb 16, 2011 ... ability. Furthermore, diffusion of a tracer into fractures and rock matrix has a universal ... Location map for the Beaufort West study area ... the ground surface in the Beaufort West region, particularly ... effects, these dykes have caused fracturing of adjacent rocks .... The volume of both the tracer and chase.

  10. Hydrodynamics of a commercial scale CFB boiler-study with radioactive tracer particles

    DEFF Research Database (Denmark)

    Lin, Weigang; Hansen, Peter F.B.; Dam-Johansen, Kim

    1999-01-01

    This paper presents the experimental results with radioactive tracer particles in an 80 MWth circulating fluidized-bed boiler. Batches of gamma-ray emitting tracer particles were injected into the standpipe. The response curves of the impulse injection were measured by a set of successive...

  11. Assessment of Average Tracer Concentration Approach for Flow Rate Measurement and Field Calibration

    Directory of Open Access Journals (Sweden)

    P. Sidauruk

    2015-12-01

    Full Text Available Tracer method is one of the methods available for open channel flow rate measurements such as in irrigation canals. Average tracer concentration approach is an instantaneous injection method that based on the average tracer concentrations value at the sampling point. If the procedures are correct and scientific considerations are justified, tracer method will give relatively high accuracy of measurements. The accuracy of the average tracer concentration approach has been assessed both in laboratory and field. The results of accuracy tests of open channel flow that has been conducted at the Center for Application Isotopes and Radiation Laboratory-BATAN showed that the accuracy level of average concentrations approach method was higher than 90% compared to the true value (volumetric flow rate. The accuracy of average tracer concentration approach was also assessed during the application of the method to measure flow rate of Mrican irrigation canals as an effort to perform field calibration of existing weirs. Both average tracer concentration approach and weirs can predict the trend of the flow correctly. However, it was observed that flow discrepancies between weirs measurement and average tracer concentration approach predictions were as high as 27%. The discrepancies might be due to the downgrading performances of the weirs because of previous floods and high sediment contents of the flow

  12. Influence of Dispersion on Transport of Tracer through Unsaturated Porous Media

    Directory of Open Access Journals (Sweden)

    T Bunsri

    2008-01-01

    Full Text Available The dispersion phenomenon has resulted from the various water flow magnitude and direction in porous media. The dissolved tracer tends to spread due to dispersion and then travel time of tracer through the porous media increases. In unsaturated porous media, dispersion coefficient varies with non-linear Darcy’s velocity and the water content. These effects observed in both of the laboratory scale sand and soil columns (20 cm. The unsaturated infiltration column and tracer tests have been used to interpret the relationships between Darcy’s velocity and the water content together with the dispersion coefficient. However, the dispersivity coefficient cannot be measured directly, it has to determine from advection-dispersion equation (ADE, which can be used to model the tracer transport in unsaturated porous media. The model was used to describe the non-linear functions of water contents and dispersivities for both porous media. The simulations have been verified that the dispersion of tracer through soil is higher than sand column and also travel time of tracer through soil is longer than sand column. Even though, soil has very low degree of pore velocity, the high dispersivity is observed in the simulations. The water content and tracer concentration profiles reveal that the increase of dispersivity induces the increase of flow path distance and the decrease of pore velocity. The maximum dispersivity was observed when the water content of porous media is relatively low; this leads the maximum of spreading of tracer.

  13. The fluorescent tracer experiment on Holiday Beach near Mugu Canyon, Southern California

    Science.gov (United States)

    Kinsman, Nicole; Xu, J. P.

    2012-01-01

    After revisiting sand tracer techniques originally developed in the 1960s, a range of fluorescent coating formulations were tested in the laboratory. Explicit steps are presented for the preparation of the formulation evaluated to have superior attributes, a thermoplastic pigment/dye in a colloidal mixture with a vinyl chloride/vinyl acetate copolymer. In September 2010, 0.59 cubic meters of fluorescent tracer material was injected into the littoral zone about 4 kilometers upcoast of Mugu submarine canyon in California. The movement of tracer was monitored in three dimensions over the course of 4 days using manual and automated techniques. Detailed observations of the tracer's behavior in the coastal zone indicate that this tracer successfully mimicked the native beach sand and similar methods could be used to validate models of tracer movement in this type of environment. Recommendations including how to time successful tracer studies and how to scale the field of view of automated camera systems are presented along with the advantages and disadvantages of the described tracer methodology.

  14. Stability of isooctane mixtures with 3-pentanone or biacetyl as fluorescence tracers in combustion experiments

    Science.gov (United States)

    Zhang, Rui; Bohac, Stanislav V.; Sick, Volker

    2006-01-01

    Evidence is presented in the literature that common fluorescence tracer/fuel mixtures used in engine experiments, 3-pentanone/isooctane and biacetyl/isooctane, may decompose during extended use and storage. Investigations presented here show that preferential evaporation of the tracer and not chemical decomposition is responsible for observed decreases in fluorescence signal strength in these experiments.

  15. Slew-rate dependence of tracer magnetization response in magnetic particle imaging.

    Science.gov (United States)

    Shah, Saqlain A; Ferguson, R M; Krishnan, K M

    2014-10-28

    Magnetic Particle Imaging (MPI) is a new biomedical imaging technique that produces real-time, high-resolution tomographic images of superparamagnetic iron oxide nanoparticle tracers. Currently, 25 kHz and 20 mT/μ0 excitation fields are common in MPI, but lower field amplitudes may be necessary for patient safety in future designs. Here, we address fundamental questions about MPI tracer magnetization dynamics and predict tracer performance in future scanners that employ new combinations of excitation field amplitude (Ho ) and frequency (ω). Using an optimized, monodisperse MPI tracer, we studied how several combinations of drive field frequencies and amplitudes affect the tracer's response, using Magnetic Particle Spectrometry and AC hysteresis, for drive field conditions at 15.5, 26, and 40.2 kHz, with field amplitudes ranging from 7 to 52 mT/μ0. For both fluid and immobilized nanoparticle samples, we determined that magnetic response was dominated by Néel reversal. Furthermore, we observed that the peak slew-rate (ωHo) determined the tracer magnetic response. Smaller amplitudes provided correspondingly smaller field of view, sometimes resulting in excitation of minor hysteresis loops. Changing the drive field conditions but keeping the peak slew-rate constant kept the tracer response almost the same. Higher peak slew-rates led to reduced maximum signal intensity and greater coercivity in the tracer response. Our experimental results were in reasonable agreement with Stoner-Wohlfarth model based theories.

  16. Borehole flowmeter logging for the accurate design and analysis of tracer tests.

    Science.gov (United States)

    Basiricò, Stefano; Crosta, Giovanni B; Frattini, Paolo; Villa, Alberto; Godio, Alberto

    2015-04-01

    Tracer tests often give ambiguous interpretations that may be due to the erroneous location of sampling points and/or the lack of flow rate measurements through the sampler. To obtain more reliable tracer test results, we propose a methodology that optimizes the design and analysis of tracer tests in a cross borehole mode by using vertical borehole flow rate measurements. Experiments using this approach, herein defined as the Bh-flow tracer test, have been performed by implementing three sequential steps: (1) single-hole flowmeter test, (2) cross-hole flowmeter test, and (3) tracer test. At the experimental site, core logging, pumping tests, and static water-level measurements were previously carried out to determine stratigraphy, fracture characteristics, and bulk hydraulic conductivity. Single-hole flowmeter testing makes it possible to detect the presence of vertical flows as well as inflow and outflow zones, whereas cross-hole flowmeter testing detects the presence of connections along sets of flow conduits or discontinuities intercepted by boreholes. Finally, the specific pathways and rates of groundwater flow through selected flowpaths are determined by tracer testing. We conclude that the combined use of single and cross-borehole flowmeter tests is fundamental to the formulation of the tracer test strategy and interpretation of the tracer test results.

  17. PENGEMBANGAN SISTEM TRACER STUDY ONLINE BERBASIS WEBSITE DI STMIK AMIKOM YOGYAKARTA

    Directory of Open Access Journals (Sweden)

    Alfie Nur Rahmi

    2014-06-01

    Full Text Available Tracer study is a mechanism that is performed by various parties to keep track of alumni in order to measure the relevance of the purpose and process of education with the current condition of the alumni. In addition, the results of a tracer study was also used as a condition of completeness of accreditation by Badan Akreditasi Nasional Perguruan Tinggi (BAN - PT . Tracer studies can be done in 2 ways , namely tracer manually and online. STMIK AMIKOM Yogyakarta is one of the colleges that have done online with tracer studies utilizing tracer system online at the alumni web pages since 2010. Yet in reality, the system utilization online tracer deemed not optimal in terms of both alumni and the AMIKOM . Based on the analysis of the old system using PIECES analysis, showed some problems and flaws in the old system . The results of this study are expected to prototype a new system able to answer the problems and deficiencies in the old system so that it can optimize the function and use of the online tracer system by the alumni and the AMIKOM.

  18. Rapid and simple determination of delivery after iontophoretic and pressure injections of radiolabeled tracer substances

    Energy Technology Data Exchange (ETDEWEB)

    Imai, H.; Steindler, D.A.; Kitai, S.T. (Michigan State Univ., East Lansing (USA))

    1983-04-01

    A fluorographic method is described using X-ray film analysis for the determination of delivery of radiolabeled tracer substances both in Agar plates and in tissue sections. This method is most useful in neuroanatomical autoradiographic studies for providing rapid identification of delivery, placement and extent of an injection site after iontophoresis or pressure injections of radiolabeled axonal tracer substances.

  19. Tracer Gas Technique Versus a Control Box Method for Estimating Direct Capture Efficiency of Exhaust Systems

    DEFF Research Database (Denmark)

    Madsen, U.; Aubertin, G.; Breum, N. O.;

    Numerical modelling of direct capture efficiency of a local exhaust is used to compare the tracer gas technique of a proposed CEN standard against a more consistent approach based on an imaginary control box. It is concluded that the tracer gas technique is useful for field applications....

  20. Characterisation of the timing of binding of the hypoxia tracer FMISO after stroke.

    Science.gov (United States)

    Spratt, Neil J; Donnan, Geoffrey A; Howells, David W

    2009-09-08

    The hypoxia tracer fluorine-18 fluoromisonidazole ([18F]FMISO) and its tritiated counterpart ([(3)H]FMISO) have been used as markers of potentially salvageable brain (ischemic penumbra) after stroke. In experimental models, the dynamics and half-life of [3H]FMISO allow concurrent histology after 24 h. Our aim was to further validate these techniques, by determining the optimum tracer exposure interval to delineate ischemic penumbra, and the effects of prolonged exposure on tracer retention in permanent ischemia. Middle cerebral artery occlusion (MCAO) of varying durations was created in rats using the thread occlusion model. Autoradiography using objective thresholding to define tracer-retention volume was performed to determine the time course of tracer retention in hypoxic tissues and the duration of ongoing retention after bolus administration. An ischemic duration of 1/2. Two hour ischemia resulted in a volume equal to 'tissue at risk'. Twenty-four hour permanent ischemia resulted in tracer-retaining tissue volumes greater than final infarction. However, the use of more stringent thresholding of autoradiographic signal produced a volume of FMISO retention closely approximating infarct volume. The findings indicate that the timing of imaging is crucial, with an optimal imaging time of 2 h using the current threshold. Earlier imaging is limited by tracer dynamics with this particular agent, however autoradiography with a longer ischemic interval (permanent occlusion) is feasible with modified thresholds. These findings support a role for hypoxia tracers in providing new insight into the ischemic penumbra.

  1. Methane emissions measured at two California landfills by OTM-10 and an acetylene tracer method

    Science.gov (United States)

    Methane emissions were measured at two municipal solid waste landfills in California using static flux chambers, an optical remote sensing approach known as vertical radial plume mapping (VRPM) using a tunable diode laser (TDL) and a novel acetylene tracer method. The tracer meth...

  2. Consequences of the amended Biomass Waste Ordinance for biological waste treatment; Konsequenzen der novellierten Bioabfallverordnung fuer die biologische Abfallbehandlung

    Energy Technology Data Exchange (ETDEWEB)

    Kehres, Bertram [Bundesguetegemeinschaft Kompost e.V. (BGK), Koeln (Germany)

    2012-11-01

    The amended Biomass Waste Ordinance will bring about changes in biological waste treatment to which operators of composting and fermenting plants will have to adapt. The contribution outlines the most relevant changes; at the time of publication, it was not known how the Bundesrat would decide with regard to the Amendment, probably in late March 2012. (orig.) [German] Die Novelle der Bioabfallverordnung wird fuer die biologische Abfallbehandlung verschiedene Veraenderungen mit sich bringen, auf die sich Betreiber von Kompostierungs- und von Vergaerungsanlagen einzustellen haben. Auf die wesentlichen Aenderungen wird in diesem Beitrag eingegangen. Zum Zeitpunkt der Abfassung dieses Beitrages ist allerdings noch nicht vollstaendig bekannt, wie der Bundesrat - voraussichtlich Ende Maerz 2012 - ueber die Novelle abschliessend entscheiden wird. (orig.)

  3. Distribution management in order to be competitive; Vertriebssteuerung im Wettbewerb. N-Ergie AG stellt Weichen fuer offensiven Marktauftritt

    Energy Technology Data Exchange (ETDEWEB)

    Kleinsorg, J.; Seitz, D. [N-Ergie AG, Nuernberg (Germany); Oertel, C.; Weinrauch, M. [Accenture GmbH, Sulzbach (Germany)

    2001-08-27

    A distribution management based on competitive strength is preconditional to be successful on the liberalized energy market. The N-Ergie joint-stock company, Nuremberg, has adapted itself to the new requirements and, consequently, reorganized its distribution structure. The basic constituents of the implemented distribution system is a Balanced Scorecard adjusted to the daily business, and an amount of coverage basing on customer segments and product groups. When implementing this distribution management special emphasis was given to the importance of cost accounting and an efficient information technology. (orig.) [German] Eine wettbewerbsorientierte Vertriebssteuerung ist Voraussetzung fuer Erfolg im liberalisierten Energiemarkt. Die N-Ergie Aktiengesellschaft, Nuernberg, hat sich auf heutige Erfordernisse eingestellt und ihre Vertriebsstrukturen konsequent neu ausgerichtet. Eine aufs Tagesgeschaeft ausgerichtete Balanced Scorecard und eine kundensegment- und produktspezifische Deckungsbeitragsrechnung sind die wesentlichen Bausteine des implementierten Vertriebssystems. Die Belange der Kostenrechnung und einer leistungsfaehigen Informationstechnologie standen bei der Umsetzung besonders im Blickpunkt. (orig.)

  4. Polux and K-store - Trendsetting technologies for wooden poles; Polux und K-Store - Zukunftstraechtige Technologien fuer Holzmasten

    Energy Technology Data Exchange (ETDEWEB)

    Sandoz, J.L.; Kratzeisen, S. [ETH Lausanne (Switzerland)

    1999-04-06

    The use of electric lines on wooden poles poses two problems for companies: To guarantly the utmost safty of their employees, and to minimise the maintenance costs. New devices developed by the Swiss Federal Institute of Technology of Lausanne respond to these problems in a reliable way. Polux is a portable device, which specifies the security diagnosis and the probable longevity of wooden poles by a diode. The K-store software analyses the data and optimises the maintenance costs. (orig.) [Deutsch] Bei der Nutzung elektrischer Leitungen auf Holzmasten stellt sich Unternehmern ein doppeltes Problem: Ihrem Personal groesstmoegliche Sicherheit zu garantieren und die Unterhaltskosten niedrig zu halten. An der Eidgenoessischen Technischen Hochschule in Lausanne entwickelte Technologien fuer Holzmasten begegnen diesen Risikofaktoren auf zuverlaessige Weise. Polux ist ein tragbares Geraet, das die Sicherheitsdiagnose sowie die voraussichtliche Lebensdauer per Lichtanzeige angibt. K-Store ist ein Computerprogramm, das die Daten ausarbeitet und damit die Optimierung der Unterhaltskosten ermoeglicht. (orig.)

  5. A method of forecasting wide band noise in axial blowers. Part 2; Prognoseverfahren fuer den Breitbandlaerm bei Axialventilatoren. Teil 2

    Energy Technology Data Exchange (ETDEWEB)

    Schneider, M.; Carolus, T. [Siegen Univ. (Germany). Inst. fuer Fluid- und Thermodynamik

    2003-05-01

    Apart from the aerodynamic data of blowers, their acoustic properties are gaining importance. In industrial practice, blower noise is commonly estimated by very simple methods which only take account of very basic machine parameters. On the other hand, many semi-empirical models have been published for calculating blower noise which require more detailed input parameters, e.g. the velocity field around the blades, boundary layer parameters, etc. These models promise to be more accurate than the simple methods. [German] Neben den aerodynamischen Daten gewinnt die Schallleistung von Ventilatoren in zunehmendem Masse an Bedeutung. In der industriellen Praxis wird das Ventilatorgeraeusch bislang mit sehr einfachen Verfahren abgeschaetzt, die nur grundlegende Maschinengroessen beruecksichtigen. In der Literatur findet man allerdings eine Vielzahl semi-empirischer Modelle fuer die Schallleistungsberechnung von Ventilatoren, die detailliertere Eingangsparameter wie das Geschwindigkeitsfeld um die Schaufeln, Grenzschichtparameter usw. erfordern. Diese Modelle versprechen eine bessere Schallprognose als die einfachen Verfahren. (orig.)

  6. Forecasting of wide band noise in axial blowers. Part 1; Prognoseverfahren fuer den Breitbandlaerm bei Axialventilatoren - Teil 1

    Energy Technology Data Exchange (ETDEWEB)

    Schneider, M.; Carolus, T. [Universitaet Siegen (Germany). Institut fuer Fluid- und Thermodynamik

    2003-04-01

    Next to the aerodynamic data, acoustic emissions of blowers are getting increasing attention. So far, estimates have been very simple, but a number of semi-empirical models have also been published which require more detailed parameters, e.g. the velocity field around the blades, boundary layer parameter, etc. These models provide more accurate predictions than the simpler methods. [German] Neben den aerodynamischen Daten gewinnt die Schallleistung von Ventilatoren in zunehmendem Masse an Bedeutung. In der industriellen Praxis wird das Ventilatorgeraeusch bislang mit sehr einfachen Verfahren abgeschaetzt, die nur grundlegende Maschinengroessen beruecksichtigen. In der Literatur findet man allerdings eine Vielzahl semi-empirischer Modelle fuer die Schallleistungsberechnung von Ventilatoren, die detailliertere Eingangsparameter wie das Geschwindigkeitsfeld um die Schaufeln, Grenzschichtparameter usw. erfordern. Diese Modelle versprechen eine bessere Schallprognose als die einfachen Verfahren. (orig.)

  7. Simulation, evaluation and optimization of hydrological storage systems; Simulation, Bewertung und Optimierung von Betriebsregeln fuer wasserwirtschaftliche Speichersysteme

    Energy Technology Data Exchange (ETDEWEB)

    Lohr, H.

    2001-07-01

    The investigation focused on controlled hydrological storage system. Existing operating schedules and new control options were analyzed, classified and generalized in order to obtain a standardized terminology and operating concept. This generalized approach will do away with the need for system-specific analyses and models for every single new system. [German] Der Schwerpunkt dieser Arbeit ist der wasserwirtschaftliche Betrieb von regelbaren Speichersystemen und ihre Simulation. Dabei bestand das Ziel darin, bestehende Betriebsplaene und neue praktikable Steuerungsmoeglichkeiten zu analysieren, zu klassifizieren und so zu generalisieren, dass eine einheitliche Terminologie und Konzeption zum Betrieb von Speichern entstand. Dieses Konzept erlaubt, in Verbindung mit den Prinzipien aus der Modellierung von Flussgebieten, verschieden strukturierte Speichersysteme mit unterschiedlichsten Steuerungsvorschriften abzubilden. Damit erhaelt man den Vorteil einer generalisierten Anwendung im Gegensatz zu einer fuer den speziellen Fall konzipierten und nicht uebertragbaren Einzelloesung. Als Folge davon entfaellt das systemspezifische, je nach Aufgabenstellung neu zu entwerfende und zu programmierende Einzelmodell. (orig.)

  8. Achievement in research on ion beam application under the scientific cooperation program with the Gesellschaft fuer schwerionenforschung mbH

    Energy Technology Data Exchange (ETDEWEB)

    Yoshida, Masaru; Maekawa, Yasunari (eds.) [Japan Atomic Energy Research Inst., Takasaki, Gunma (Japan). Takasaki Radiation Chemistry Research Establishment

    2003-03-01

    The Japan Atomic Energy Research Institute (JAERI) and the Gasellshaft fuer Schwerionenforshung mbH (GSI) signed a memorandum of 'Research and Development in the Field of Ion Beam Application' in January, 1991 and started the cooperative research program. The cooperation has been implemented by means of joint research between JAERI and GSI, exchange of scientific and technical experts, and providing mutual exchange of research materials as well as technical information. This report summarizes the cooperative research activities under the cooperative research program in the last 12 years. The list of publications and several articles relating to this cooperative research program are attached as an appendix. All the attached articles are reprinted with permission from the publishers. (author)

  9. A parameter identifiability study of two chalk tracer tests

    Directory of Open Access Journals (Sweden)

    S. A. Mathias

    2006-08-01

    Full Text Available As with most fractured rock formations, Chalk is highly heterogeneous. Therefore, meaningful estimates of model parameters must be obtained at a scale comparable with the process of concern. These are frequently obtained by calibrating an appropriate model to observed concentration-time data from radially convergent tracer tests (RCTT. Arguably, an appropriate model should consider radially convergent dispersion (RCD and Fickian matrix diffusion. Such a model requires the estimation of at least four parameters. A question arises as to whether or not this level of model complexity is supported by the information contained within the calibration data. Generally modellers have not answered this question due to the calibration techniques employed. A dual-porosity model with RCD was calibrated to two tracer test datasets from different UK Chalk aquifers. A multivariate sensitivity analysis, which assumed only a priori upper and lower bounds for each model parameter, was undertaken. Rather than looking at measures of uncertainty, the shape of the multivariate objective function surface was used to determine whether a parameter was identifiable. Non-identifiable parameters were then removed and the procedure was repeated until all remaining parameters were identifiable.

    It was found that the single fracture model (SFM (which ignores mechanical dispersion obtained the best mass recovery, excellent model performance and best parameter identifiability in both the tests studied. However, there was no objective evidence suggesting that mechanical dispersion was negligible. Moreover, the SFM (with just two parameters was found to be good at approximating the Single Fracture Dispersion Model SFDM (with three parameters when different, and potentially erroneous parameters, were used. Overall, this study emphasises the importance of adequate temporal sampling of breakthrough curve data prior to peak concentrations, to ensure adequate characterisation of

  10. Groundwater surface water interaction study using natural isotopes tracer

    Science.gov (United States)

    Yoon, Yoon Yeol; Kim, Yong Chul; Cho, Soo Young; Lee, Kil Yong

    2015-04-01

    Tritium and stable isotopes are a component of the water molecule, they are the most conservative tracer for groundwater study. And also, radon is natural radioactive nuclide and well dissolved in groundwater. Therefore, these isotopes are used natural tracer for the study of surface water and groundwater interaction of water curtain greenhouse area. The study area used groundwater as a water curtain for warming tool of greenhouse during the winter, and is associated with issues of groundwater shortage while being subject to groundwater-river water interaction. During the winter time, these interactions were studied by using Rn-222, stable isotopes and H-3. These interaction was monitored in multi depth well and linear direction well of groundwater flow. And dam effect was also compared. Samples were collected monthly from October 2013 to April 2014. Radon and tritium were analyzed using Quantulus low background liquid scintillation counter and stable isotopes were analyzed using an IRIS (Isotope Ratio Infrared Spectroscopy ; L2120-i, Picarro). During the winter time, radon concentration was varied from 0.07 Bq/L to 8.9 Bq/L and different interaction was showed between dam. Surface water intrusion was severe at February and restored April when greenhouse warming was ended. The stable isotope results showed different trend with depth and ranged from -9.16 ‰ to -7.24 ‰ for δ 18O value, while the δD value was ranged from -57.86 ‰ to -50.98 ‰. The groundwater age as dated by H-3 was ranged 0.23 Bq/L - 0.59 Bq/L with an average value of 0.37 Bq/L.

  11. Intracellular performance of tailored nanoparticle tracers in magnetic particle imaging

    Energy Technology Data Exchange (ETDEWEB)

    Arami, Hamed; Krishnan, Kannan M., E-mail: kannanmk@uw.edu [Department of Materials Science and Engineering, University of Washington, P.O. Box 352120, Seattle, Washington 98195-2120 (United States)

    2014-05-07

    Magnetic Particle Imaging (MPI) is a quantitative mass-sensitive, tracer-based imaging technique, with potential applications in various cellular imaging applications. The spatial resolution of MPI, in the first approximation, improves by decreasing the full width at half maximum (FWHM) of the field-derivative of the magnetization, dm/dH of the nanoparticle (NP) tracers. The FWHM of dm/dH depends critically on NPs’ size, size distribution, and their environment. However, there is limited information on the MPI performance of the NPs after their internalization into cells. In this work, 30 to 150 μg of the iron oxide NPs were incubated in a lysosome-like acidic buffer (0.2 ml, 20 mM citric acid, pH 4.7) and investigated by vibrating sample magnetometry, magnetic particle spectroscopy, transmission electron microscopy, and dynamic light scattering (DLS). The FWHM of the dm/dH curves of the NPs increased with incubation time and buffer to NPs ratio, consistent with a decrease in the median core size of the NPs from ∼20.1 ± 0.98 to ∼18.5 ± 3.15 nm. Further, these smaller degraded NPs formed aggregates that responded to the applied field by hysteretic reversal at higher field values and increased the FWHM. The rate of core size decrease and aggregation were inversely proportional to the concentration of the incubated NPs, due to their slower biodegradation kinetics. The results of this model experiment show that the MPI performance of the NPs in the acidic environments of the intracellular organelles (i.e., lysosomes and endosomes) can be highly dependent on their rate o