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. Threshold limit values, test values and sanitation values for soil sanitation; Richt-, Pruef- und Sanierungswerte fuer den Bodenschutz

    Energy Technology Data Exchange (ETDEWEB)

    Karlaganis, G.; Dettwiler, J. [Bundesamt fuer Umwelt, Wald und Landschaft (BUWAL), Bern (Switzerland). Abt. Stoffe, Boden, Biotechnologie

    1998-09-01

    Soils, the basis for human, plant and animal life, are exposed to quantitative and qualitative deterioration. Quantitative deterioration refers to paving of ground but also to erosion and soil destruction. There are new regulations for physical protection of soil which refer to soil erosion, compacting and handling of soil during building construction. (orig.) [Deutsch] Boden als natuerliche Lebensgrundlage fuer Mensch, Tiere und Pflanzen ist quantitativen und qualitativen Beeintraechtigungen ausgesetzt. Als quantitative Beeintraechtigung gilt jede Art von Verminderungen der Boeden durch Bauten und Anlagen, aber auch durch Erosion oder Bodenschwund. Erlassen worden sind nun neue Bestimmungen fuer drei Bereiche des physikalischen Bodenschutzes, naemlich fuer die Bodenerosion, die Bodenverdichtung und fuer den Umgang mit dem Boden vor allem beim Bauen. Die Verordnung vom 1. Juli 1998 ueber Belastungen des Bodens (VBBo`98) erhaelt neu drei Arten von Beurteilungs- bzw. Massnahmewerten, naemlich Richtwerte, Sanierungswerte und Pruefwerte. (orig./ABI)

  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. Tumoral tracers

    International Nuclear Information System (INIS)

    Camargo, E.E.

    1979-01-01

    Direct tumor tracers are subdivided in the following categories:metabolite tracers, antitumoral tracers, radioactive proteins and cations. Use of 67 Ga-citrate as a clinically important tumoral tracer is emphasized and gallium-67 whole-body scintigraphy is discussed in detail. (M.A.) [pt

  8. The stuff of enlightening diagnoses; Stoff fuer erhellende Diagnosen

    Energy Technology Data Exchange (ETDEWEB)

    Huebner, Karl

    2017-07-01

    Doctors today already frequently rely on positron emission tomography - PET for short - in cancer diagnostics. However, in order to use this method for other diseases, too, they need suitable tracer substances containing radioactive fluorine-18 - a challenge for Tobias Ritter and his team at the Max Planck Institut fuer Kohlenforschung in Muelheim an der Ruhr. The chemists are searching for ways to label diverse molecules with fluorine-18 and thus expand the range of possibilities for medical specialists.

  9. Tracer theory

    International Nuclear Information System (INIS)

    Margrita, R.

    1988-09-01

    Tracers are used in many fields of science to investigate mass transfer. The scope of tracers applications in Service of Applications Radioisotopes (S.A.R.-France) is large and concerns natural and industrial systems such as Sciences of earth: hydrology - civil engineering - Sedimentology - environmental studies. Industrial field: chemical engineering - mechanical engineering. A general tracer methodology has been developed in our laboratories from these different applications fields and this paper shows these different points of view in using tracers; our wish is that the methods used in an experimental field can be employed in an another one

  10. 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.

  11. Hydrodynamic or hydrochemical aspects of anthropogenic and naturally induced bank filtration - examples from Berlin/Brandenburg; Hydrodynamische und hydrochemische Aspekte der anthropogen und natuerlich induzierten Uferfiltration am Beispiel von Berlin/Brandenburg

    Energy Technology Data Exchange (ETDEWEB)

    Massmann, G.; Pekdeger, A. [Freie Universitaet Berlin (Germany). Institut fuer Geologische Wissenschaften, Arbeitsbereich Hydrogeologie; Duennbier, U. [Berliner Wasserbetriebe, Labor, Berlin (Germany); Heberer, T. [Niedersaechsisches Landesamt fuer Verbraucherschutz und Lebensmittelsicherheit (LAVES), Lebensmittelinstitut Oldenburg (Germany); Richter, D. [DVGW - Technologiezentrum Wasser (TZW), Karlsruhe (Germany); Sueltenfuss, J. [Universitaet Bremen (Germany). Institut fuer Umweltphysik, AG Ozeanographie; Tosaki, Y. [University of Tsukuba (Japan). Sustainable Environmental Studies, Graduate School of Life and Environmental Sciences

    2009-09-15

    Bank filtration is the natural or anthropogenically induced process of surface water infiltration into an aquifer. It is of particular importance as a method to gain or pre-treat water for drinking water production. The hydrodynamic and hydrochemical processes during bank filtration were investigated at one rural site in the Oderbruch and at two urban sites in Berlin (Germany). Results show that these sites differ substantially with regard to the characteristics of the hyporheic zone (permeable versus clogged), travel times (decades versus months to decades) and shape of the redox zones (horizontal versus vertical redox succession). The hyporheic zone is a key parameter determining the site characteristics. Since the surface water in Berlin contains a proportion of treated sewage, a number of wastewater-bound substances (e. g. pharmaceutical residues) have been detected in the surface water. Most of them were, however, fully or partly removed during bank filtration. The redox conditions are an important key parameter with regard to the elimination (or persistence) of a number of organic trace compounds (e. g. phenazone, sulfamethoxazole, clindamycin), whose elimination depends on the prevailing redox environment. (orig.) [German] Uferfiltration ist die natuerlich bedingte oder anthropogen induzierte Infiltration von Oberflaechenwasser in den Grundwasserleiter und ist insbesondere als Methode der Rohwassergewinnung fuer die Trinkwasserproduktion von Bedeutung. Die hydrodynamischen und hydrochemischen Prozesse bei der Uferfiltration wurden an einer Untersuchungstransekte im laendlichen Oderbruch und an zwei Transekten im urbanen Berlin umfangreich untersucht, dabei lag ein Schwerpunkt auf der Anwendung verschiedener Tracermethoden. Die Ergebnisse zeigen, dass sich die Standorte sehr stark insbesondere bezueglich der Beschaffenheit der Gewaessersohle (gut bzw. schlecht durchlaessig), der Fliesszeiten (Jahrzehnte bzw. Monate bis Jahrzehnte) und der Ausbildung von

  12. 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.

  13. 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.

  14. 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

  15. Fuel cells for the electricity supply of plants remote from the grid; Brennstoffzellen fuer die Elektrizitaetsversorgung von netzfernen Anlagen

    Energy Technology Data Exchange (ETDEWEB)

    Ledjeff, K

    1996-12-31

    The solar house at Freiburg, which is independent for energy, obtains all its energy only from the radiation impinging on the outside of the building. The space heating, provision of hot water, energy for cooking and electricity are provided by conversion of solar energy. A photo-electric generator supplies electricity which, apart from direct consumption, can be stored in a lead battery and the hydrogen system. The hydrogen system is the last link in the chain of the energy converter and represents the only energy supply if the thermal and electrical systems cannot any longer be supplied by the sun. The hydrogen system must therefore cover the energy demand in winter, consisting of a small heater for space heating and of course the fuel cell for providing electricity. The ideal fuel cell system for the solar house, which is independent for energy, is the PEMFC with an output of 500 W-1 kW. (orig./MM) [Deutsch] Das Energieautarke Solarhaus in Freiburg bezieht die gesamte Energie nur aus der auf die Gebaeudehuelle auftreffende Strahlung. Die Raumheizung, die Warmwasserbereitung, die Energie zum Kochen und der elektrische Strom werden durch die Umwandlung von Sonnenenergie bereitgestellt. Ein Photovoltaik-Generator liefert elektrische Energie, die neben dem direkten Verbrauch in eine Bleibatterie und das Wasserstoffsystem zur Speicherung eingespeist werden kann. Die Wasserstoffspeicherung erfolgt als Gas bei einem Druck von 30 bar. Das Wasserstoffsystem ist das letzte Glied in der Kette der Energiewandler und stellt den einzigen Energievorrat dar, wenn die thermischen und elektrischen Systeme nicht mehr solar versorgt werden koennen. Das Wasserstoffsystem muss daher den Energiebedarf im Winter decken, das sich ein kleiner Nachheizer fuer die Raumheizung und natuerlich die Brennstoffzelle zur Bereitstellung elektrischer Energie. Das ideale Brennstoffzellensystem fuer das Energieautarke Solarhaus ist die PEMFC mit einer Leistung von 500 W-1 kW. (orig./MM)

  16. Bundesforschungsanstalt fuer Ernaehrung. Annual report

    International Nuclear Information System (INIS)

    1996-01-01

    The 1994 annual report of the Bundesforschungsanstalt fuer Ernaehrung describes the tasks, structure and staff and fields of research of this institution and its scientific cooperation with other institutions. The report is supplemented by an alphabetic list off all publications. The BFE specializes in research on nutritional, food and ecotrophological sciences. (vhe) [de

  17. 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

  18. Contributions to hydrological tracer methods and their application

    International Nuclear Information System (INIS)

    1982-04-01

    The activities of the Institut fuer Radiohydrometrie of the GSF are mainly devoted to the field of environmental research studying the quality, use and protection from pollution of drinking water which has become scarce in many parts of the world. The knowledge and experience of a variety of scientific disciplines are combined to the common task of developing new tracer methods and selecting suitable hydrogeological methods to allow quantitative studies of the hydrological cycle, from rainfall to surface or sub-surface run-off. The tracers used in these studies are for the most part stable, natural radioisotopes occurring in the hydrological cycle, as well as fluorescent dyes or radionuclides for water labelling. The contributions collected in this volume are grouped according to the above outline of tasks and present a survey of current methods and measurements, illustrating their efficiency in solving hydrological problems. (orig./RW) [de

  19. CERN: 500 Millionen fuer neuen Teilchenbeschleuniger

    CERN Multimedia

    2002-01-01

    "Die 20 Mitgliederlaender des Europaeischen Labors fuer Teilchenphysik in Genf CERN haben einen Sparplan zur Finanzierung eines neuen Teilchenbeschleunigers gut geheissen. Rund 500Millionen Franken sollen zu diesem Zweck uminvestiert werden" (1/2 page).

  20. 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.

  1. 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.

  2. Isotopic marking and tracers

    International Nuclear Information System (INIS)

    Morel, F.

    1997-01-01

    The use of radioactive isotopes as tracers in biology has been developed thanks to the economic generation of the required isotopes in accelerators and nuclear reactors, and to the multiple applications of tracers in the life domain; the most usual isotopes employed in biology are carbon, hydrogen, phosphorus and sulfur isotopes, because these elements are present in most of organic molecules. Most of the life science knowledge appears to be dependent to the extensive use of nuclear tools and radioactive tracers; the example of the utilization of radioactive phosphorus marked ATP to study the multiple reactions with proteins, nucleic acids, etc., is given

  3. Suitability of tracers

    International Nuclear Information System (INIS)

    Klotz, D.

    1999-01-01

    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 [de

  4. Tracers Detect Aquifer Contamination

    National Research Council Canada - National Science Library

    Enfield, Carl

    1995-01-01

    The EPA's National Laboratory (NRMRL) at Ada, OK, along with the University of Florida and the University of Texas, have developed a tracer procedure to detect the amount of contamination in aquifer formations...

  5. Radio-isotopic tracers

    International Nuclear Information System (INIS)

    Wolfangel, R.G.

    1976-01-01

    The invention concerns the dispersions that may be used for preparing radio-isotopic tracers, technetium labelled dispersions, processes for preparing these dispersions and their use as tracers. Technetium 99m sulphur colloids are utilized as scintillation tracers to give a picture of the reticulo-endothelial system, particularly the liver and spleen. A dispersion is provided which only requires the addition of a radioactive nuclide to form a radioactively labelled dispersion that can be injected as a tracer. It is formed of a colloid of tin sulphur dispersed in an aqueous buffer solution. Such a reagent has the advantage of being safe and reliable and is easier to use. The colloid can be prepared more quickly since additions of several different reagents are avoided. There is no need to heat up and no sulphuretted hydrogen, which is a toxic gas, is used [fr

  6. Tracer techniques in microelectronics

    International Nuclear Information System (INIS)

    Flachowsky, J.; Freyer, K.

    1981-01-01

    Tracer technique and neutron activation analysis are capable of measuring impurities in semiconductor material or on the semiconductor surface in a very low concentration range. The methods, combined with autoradiography, are also suitable to determine dopant distributions in silicon. However, both techniques suffer from certain inherent experimental difficulties and/or limitations which are discussed. Methods of tracer technique practicable in the semiconductor field are described. (author)

  7. Tracers and tracing methods

    International Nuclear Information System (INIS)

    Leclerc, J.P.

    2001-01-01

    The first international congress on 'Tracers and tracing methods' took place in Nancy in May 2001. The objective of this second congress was to present the current status and trends on tracing methods and their applications. It has given the opportunity to people from different fields to exchange scientific information and knowledge about tracer methodologies and applications. The target participants were the researchers, engineers and technologists of various industrial and research sectors: chemical engineering, environment, food engineering, bio-engineering, geology, hydrology, civil engineering, iron and steel production... Two sessions have been planned to cover both fundamental and industrial aspects: 1)fundamental development (tomography, tracer camera visualization and particles tracking; validation of computational fluid dynamics simulations by tracer experiments and numerical residence time distribution; new tracers and detectors or improvement and development of existing tracing methods; data treatments and modeling; reactive tracer experiments and interpretation) 2)industrial applications (geology, hydrogeology and oil field applications; civil engineering, mineral engineering and metallurgy applications; chemical engineering; environment; food engineering and bio-engineering). The program included 5 plenary lectures, 23 oral communications and around 50 posters. Only 9 presentations are interested for the INIS database

  8. Research for energy efficiency; Forschung fuer Energieeffizienz

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2010-09-15

    The Federal Ministry of Economy enhanced its funding for research in the field of non-nuclear energy in the programme ''Forschung fuer Energieeffizienz'' (Research for Energy Efficiency). The programme focuses on established areas like modern power plant technologies (''Moderne Kraftwerkstechnologien''), fuel cells and hydrogen (''Brennstoffzelle, Wasserstoff''), and energy-optimized building construction (''Energieoptimiertes Bauen''). New subjects are energy-efficient towns and cities (''Energieeffiziente Stadt''), power grids for future power supply (''Netze fuer die Stromversorgung der Zukunft''), power storage (''Stromspeicher''), and electromobility (''Elektromobilitaet''). The brochure presents research and demonstration projects that illustrate the situation in 2010 when the programme was initiated. (orig.)

  9. Energy revolution for Africa; Energierevolution fuer Afrika

    Energy Technology Data Exchange (ETDEWEB)

    Gies, Erica

    2017-07-01

    Decreasing energy costs from renewable sources could enable many African countries to make the leap into a clean future. This would save the continent the detour via the classic dirty sources. [German] Sinkende Kosten fuer Energie aus erneuerbaren Quellen koennten vielen afrikanischen Laendern den Sprung in eine saubere Zukunft ermoeglichen. Damit wuerde sich der Kontinent den Umweg ueber die klassischen schmutzigen Quellen sparen.

  10. Bundesamt fuer Strahlenschutz 1989-2014

    International Nuclear Information System (INIS)

    Ebermann, Lutz

    2015-01-01

    The information on the Bundesamt fuer Strahlenschutz 1989-2014 includes the following contributions: Bfs concentrates the radiation protection expertise; knowledge generation, knowledge testing knowledge application: the BfS as scientific organization; radiation protection and health; radiation protection and environment, safety of nuclear waste management; safety in nuclear technology; specific challenges for BfS.

  11. Bundesanstalt fuer Strahlenschutz. Annual report 2013

    International Nuclear Information System (INIS)

    Ebermann, Lutz

    2014-01-01

    The annual report 2013 of the Bundesamt fuer Strahlenschutz covers the following issues: from scientific research to preventive consumer protection, actual questions of radiation protection actual challenges in the frame of environmental radiation monitoring; radioactive waste disposal; actual questions on the safety of nuclear technology. The report includes a list of publications.

  12. Wairakei tracer tests 1983

    International Nuclear Information System (INIS)

    McCabe, W.J.; Barry, B.J.

    1984-05-01

    Tracer tests, with and without, hot water reinjection into WK213 showed returns of tracer iodine-131; in wells in both the Waiora Valley and the eastern end of the field. The effect of reinjection at a rate of 200 cu. m/h was to reduce the arrived time from 15 to 7 days. Increasing the rate of reinjection into WK62 from 30 cu. m/h to 200 cu. m/h seemed to increase the initial velocity of the tracer wave and the distance it moved. However, returns were recorded only in the adjacent wells WK61 and WK63 with a very small, and three days delayed, response in WK43

  13. 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.

  14. Comparison of different filtration techniques for the pre-concentration of natural colloidal dispersions for field-flow-fractionation (FFF); Vergleich verschiedener Filtrationstechniken zur Aufkonzentrierung natuerlicher kolloidaler Dispersionen fuer die Feld-Fluss-Fraktionierung (FFF)

    Energy Technology Data Exchange (ETDEWEB)

    Saal, C.; Kammer, F. v.d. [Technische Univ. Hamburg-Harburg, Arbeitsbereich Umweltschutztechnik, Hamburg (Germany)

    2002-07-01

    The objektive of this study was to compare different pre-treatment techniques (active and passive filtration techniques applying various membranes) for field-flow-fractionation (FFF) analysis of natural aquatic colloids. In most cases FFF of natural water samples requires a pre-concentration step prior to analysis. The used FFF-method with online multi-detector-analysis (MDA) is a versatile method to specify the size distribution of particles (> 10 nm) in aqueous systems. Coupling FFF with trace element analysis (e. g. ICP-MS or total reflextion X-ray fluorescence (TXRF)) is a possibility for the determination of element/ size distributions. Analysing natural water samples with FFF a sample pre-treatment is needed in most cases, which can be a coarse filtration (> 5 {mu}m) to separate algea from the sample and a preconcentration of the colloidal fraction. The pre-treatment of the sample has to assure a minimum loss of colloidal particulate matter (CPM) and no change of size distribution. The different pre-concentration techniques were tested with water extractable soil colloids. We have developed methods with concentration factors F < 50 showing minor effects on the colloidal composition of the sample, so that these methods can be used to concentrate CPM of natural waters for size- and trace metal analysis. (orig.)

  15. 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.

  16. 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.)

  17. Models for tracer flow

    International Nuclear Information System (INIS)

    Zuber, A.

    1983-01-01

    A review and discussion is given of mathematical models used for interpretation of tracer experiments in hydrology. For dispersion model, different initial and boundary conditions are related to different injection and detection modes. Examples of applications of various models are described and commented. (author)

  18. Xanthine tracers and their preparation

    International Nuclear Information System (INIS)

    Groman, E.V.; Cabelli, M.D.

    1980-01-01

    Compounds useful as tracers in the radioimmunoassay of xanthine derivatives such as theophylline and pharmacologically related drugs are described. They are substituted xanthines in which at least one substituted radical contains radioiodine. The tracers are made by linking radioiodinatable or preradioiodinated radicals to the xanthine derivative which is to be assayed. The tracers may be employed in known radioimmunoassay techniques. (author)

  19. 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)

  20. Tracer tests Wairakei

    International Nuclear Information System (INIS)

    McCabe, W.J.; Manning, M.R.; Barry, B.J.

    1980-07-01

    The report summarises the radioactive tracer tests, using iodine-131 and bromine-82, made in the Wairakei geothermal field over the period 1978-80. Injection of tracer into three wells with strong cool water downflows at about 300-400m below ground level, produced strong rapid responses from the only deep wells feeding from about 800-1000m and lying in the south-westerly direction from the injection wells, i.e. parallel to the fault planes. Shallower wells, even though in some cases much closer to the injection well, reacted much more slowly. Velocities, as measured by peak arrival times, as high as 22m/h over 200m and 11m/h over 650m, were found. The flow patterns for the cool water feeds to the production area are discussed

  1. Radioactive tracers in Sedimentology

    International Nuclear Information System (INIS)

    Rodrigues, H.T.

    1973-01-01

    First is given a broad description of the uses of radioactive tracers in Sedimentology. The general method is established, including determinations of probability and standard deviation. Following are determined: the response law of the detector, the minimum mass for statistical detection, and the minimum mass for dynamic detection. The granularity is an important variable in these calculations. Final conclusions are given, and results are compared with existing theories

  2. 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

  3. Tracers and Tracer Testing: Design, Implementation, Tracer Selection, and Interpretation Methods

    Energy Technology Data Exchange (ETDEWEB)

    G. Michael Shook; Shannon L.; Allan Wylie

    2004-01-01

    Conducting a successful tracer test requires adhering to a set of steps. The steps include identifying appropriate and achievable test goals, identifying tracers with the appropriate properties, and implementing the test as designed. When these steps are taken correctly, a host of tracer test analysis methods are available to the practitioner. This report discusses the individual steps required for a successful tracer test and presents methods for analysis. The report is an overview of tracer technology; the Suggested Reading section offers references to the specifics of test design and interpretation.

  4. Heat tracer methods

    Science.gov (United States)

    Healy, Richard W.; Scanlon, Bridget R.

    2010-01-01

    The flow of heat in the subsurface is closely linked to the movement of water (Ingebritsen et al., 2006). As such, heat has been used as a tracer in groundwater studies for more than 100 years (Anderson, 2005). As with chemical and isotopic tracers (Chapter 7), spatial or temporal trends in surface and subsurface temperatures can be used to infer rates of water movement. Temperature can be measured accurately, economically, at high frequencies, and without the need to obtain water samples, facts that make heat an attractive tracer. Temperature measurements made over space and time can be used to infer rates of recharge from a stream or other surface water body (Lapham, 1989; Stonestrom and Constantz, 2003); measurements can also be used to estimate rates of steady drainage through depth intervals within thick unsaturated zones (Constantz et al., 2003; Shan and Bodvarsson, 2004). Several thorough reviews of heat as a tracer in hydrologic studies have recently been published (Constantz et al., 2003; Stonestrom and Constantz, 2003; Anderson, 2005; Blasch et al., 2007; Constantz et al., 2008). This chapter summarizes heat-tracer approaches that have been used to estimate recharge.Some clarification in terminology is presented here to avoid confusion in descriptions of the various approaches that follow. Diffuse recharge is that which occurs more or less uniformly across large areas in response to precipitation, infiltration, and drainage through the unsaturated zone. Estimates of diffuse recharge determined using measured temperatures in the unsaturated zone are referred to as potential recharge because it is possible that not all of the water moving through the unsaturated zone will recharge the aquifer; some may be lost to the atmosphere by evaporation or plant transpiration. Estimated fluxes across confining units in the saturated zone are referred to as interaquifer flow (Chapter 1). Focused recharge is that which occurs directly from a point or line source, such

  5. Development of radioisotope tracer technology

    International Nuclear Information System (INIS)

    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)

  6. 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.

  7. Bundesanstalt fuer Strahlenschutz. Annual report 2013; Bundesanstalt fuer Strahlenschutz. Jahresbericht 2013

    Energy Technology Data Exchange (ETDEWEB)

    Ebermann, Lutz (comp.)

    2014-10-01

    The annual report 2013 of the Bundesamt fuer Strahlenschutz covers the following issues: from scientific research to preventive consumer protection, actual questions of radiation protection actual challenges in the frame of environmental radiation monitoring; radioactive waste disposal; actual questions on the safety of nuclear technology. The report includes a list of publications.

  8. Radionuclides as tracers

    International Nuclear Information System (INIS)

    Ganatra, R.D.

    1992-01-01

    Importance of radioisotopes in medicine is because of their two characteristics: their biological behaviour is identical to their stable counterparts, and because they are radioactive their emissions can be detected by a suitable instrument. All isotopes of iodine will behave in the same way and will concentrate in the thyroid gland. There is no way of detecting the stable, natural iodine in the thyroid gland, but the presence of radioactive iodine can be detected externally in vivo by a detector. Thus, the radioactive iodine becomes a tracer, a sport of a spy, which mimics the behaviour of natural iodine and relays information to a detector. The radioactive tracers are popular because of the ease with which they can be detected in vivo and the fact that the measurement of their presence in the body can be in quantitative terms. The measurement can be very accurate and sensitive. Whenever the measurements can be done in vivo, the information is obtained in dynamic terms, as it is happening, as if the physiological events become transparent

  9. Bundesamt fuer Strahlenschutz. Annual report 1992

    International Nuclear Information System (INIS)

    1993-08-01

    The progress report submitted by Bundesamt fuer Strahlenschutz reveals that this federal radiation protection agency is not only entrusted with the fulfillment of the federal administrative tasks imposed by law but engages in applications-oriented research regarding the operational, metrological and health-related aspects of radiation protection, regarding nuclear safety and radioactive waste management. In addition, BfS takes care of public-relations tasks. The reports submitted by the BfS departments are completed by summaries of the main research results. (orig.) [de

  10. 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)

  11. Radon as geological tracer

    International Nuclear Information System (INIS)

    Lacerda, T.; Anjos, R.M.; Silva, A.A.R. da; Yoshimura, E.M.

    2012-01-01

    Full text: This work presents measurements of 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 40 K, 232 Th and 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 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 -3 recommended by the International Commission of Radiological Protection (ICRP). The chimney effect shows the low mean concentration of radon in Los Condores. (author)

  12. 50. Annual meeting of the Deutsche Gesellschaft fuer Neuroradiologie. Abstracts

    International Nuclear Information System (INIS)

    2015-01-01

    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.

  13. 49. Annual meeting of the Deutsche Gesellschaft fuer Neuroradiologie. Abstracts

    International Nuclear Information System (INIS)

    2014-01-01

    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.

  14. 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)

  15. Tracer dating and ocean ventilation

    International Nuclear Information System (INIS)

    Thiele, G.; Sarmiento, J.L.

    1990-01-01

    The interpretation of transient tracer observations depends on difficult to obtain information on the evolution in time of the tracer boundary conditions and interior distributions. Recent studies have attempted to circumvent this problem by making use of a derived quantity, age, based on the simultaneous distribution of two complementary tracers, such as tritium and its daughter, helium 3. The age is defined with reference to the surface such that the boundary condition takes on a constant value of zero. The authors use a two-dimensional model to explore the circumstances under which such a combination of conservation equations for two complementary tracers can lead to a cancellation of the time derivative terms. An interesting aspect of this approach is that mixing can serve as a source or sink of tracer based age. The authors define an idealized ventilation age tracer that is conservative with respect to mixing, and they explore how its behavior compares with that of the tracer-based ages over a range of advective and diffusive parameters

  16. Tracer research in process engineering

    International Nuclear Information System (INIS)

    Iller, E.

    1992-01-01

    The book is a review of modern applications of tracer techniques in chemical and process engineering studies. The next topics have been extensively presented: 1) media flow through apparatus; 2) the tracers in the study of media flow dynamics through apparatus; 3) mathematical interpretation of experimental data from impulse-response method; 4) the models of media flow through chemical reactors and apparatus; 5) radiotracers in mass transport study; 6) examples of practical applications of tracer methods in industrial objects. 84 refs, 96 figs, 31 tabs

  17. Tracer dispersion - experiment and CFD

    International Nuclear Information System (INIS)

    Zitny, R.

    2004-01-01

    Description of tracer distribution by means of dispersion models is a method successfully used in process engineering for fifty years. Application of dispersion models in reactor engineering for characterization of flows in column apparatus, heat exchangers, etc. is summarized and experimental tracer techniques as well as CFD methods for dispersion coefficients evaluation are discussed. Possible extensions of thermal axial dispersion model (ADM) and a core-wall ADM model suitable for description of tracer dispersion in laminar flows are suggested as well as CFD implementation as 1D finite elements. (author)

  18. Meteorological tracers in regional planning

    International Nuclear Information System (INIS)

    Mueller, K.H.

    1974-11-01

    Atmospheric tracers can be used as indicators to study both the ventilation of an urban region and its dispersion meteorology for air pollutants. A correlation analysis applied to the space-time dependent tracer concentrations is able to give transfer functions, the structure and characteristic parameters of which describe the meteorological and topographical situation of the urban region and its surroundings in an integral manner. To reduce the number of persons usually involved in a tracer experiment an automatic air sampling system had to be developed

  19. Natural attenuation of petroleum products in soils. Examination in an exotoxicologic test battery; Natuerliches Abbaupotential von Mineraloelprodukten in Boeden. Pruefung in einer oekotoxikologischen Testbatterie

    Energy Technology Data Exchange (ETDEWEB)

    Neumann-Hensel, H. [Dr. Fintelmann und Dr. Meyer Handels- und Umweltschutzlaboratorien GmbH, Hamburg (Germany); Ahlf, W.; Gerth, J.; Foerstner, U. [Technische Univ. Hamburg-Harburg, Hamburg (Germany). Arbeitsbereich Umweltschutztechnik

    1999-07-01

    Contaminated soils require an environmental assessment on the maintenance of natural functions, especially for the protection of groundwater. In case of contamination the evaluation methods, which describe the natural mechanisms in soils (unsaturated zone) due to attenuation/intrinsic remediation of hazardous substances, obtain special importance. Natural attenuation - as a strategy of remediation - uses the process in the underground, which reduce hazardous effects of contaminants in soils. As a useful observation module a biological testset is presented to characterise the remaining ecotoxicologic risk due to mineral oil hydrocarbons (MCH) in soils. Examinations of an artificially MCH contaminated soil and a real abandoned hazardous waste site validated the usefullness of the testset. The selection of methods follows the criteria: sensitivity, practicability, time-demand and the capability of standardisation. (orig.) [German] Kontaminierte Boeden erfordern eine Umweltpruefung zum Erhalt ihrer natuerlichen Funktionen, insbesondere gilt dies fuer das Schutzgut Grundwasser. Bei Schadensfaellen bekommen dadurch Bewertungsmethoden, die die natuerlichen Mechanismen des Boden (ungesaettigte Zone) zum Schadstoffabbau bzw. -rueckhalt beschreiben, eine besondere Bedeutung. Natural Attenuation (NRA) als Sanierungsstrategie nutzt die natuerlicherweise im Untergrund ablaufenden Prozesse, die Schadstoffkonzentrationen oder -wirkungen im Boden vermindern. Als ein geeigneter Ueberwachungsbaustein kann ein oekotoxikologisches Testset eingesetzt werden, um das Abbaupotential und das oekotoxikologische Restristiko von Mineraloelkohlenwasserstoffen (MKW) zu charakterisieren. Untersuchungsergebnisse an einem mit MKW kuenstlich kontaminierten Boden und an einer realen Altlast werden vorgestellt. Die Methodenauswahl des Testsets erfolgt nach den Kriterien: Sensitivitaet, Praktikabilitaet, Zeitbedarf und Standardisierbarkeit. (orig.)

  20. Proceedings of the atmospheric tracers and tracer application workshop

    International Nuclear Information System (INIS)

    Barr, S.; Gedayloo, T.

    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 13 C 18 O 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

  1. Tracer studies with aortic infusion result in improper tracer distribution

    International Nuclear Information System (INIS)

    Wisneski, J.A.; Brooks, G.A.; Neese, R.A.; Stanley, W.C.; Morris, D.L.; Gertz, E.W.

    1986-01-01

    It has been suggested that lactate turnover can be accurately assessed by infusing radioactive lactate tracer into the aorta and sampling blood in the vena cava. However, there may be streaming of newly infused tracer in the aorta, resulting in a nonuniform arterial specific activity (SA). Furthermore vena caval blood may not be representative of mixed venous blood. The authors examined this problem in 7 anesthetized dogs with sampling catheters in the pulmonary (PA), carotid (CA), and femoral (FA) arteries, and the superior (SVC) and inferior (IVC) vena cavi. [1- 14 C]lactate was continuously infused into the left ventricle through a catheter introduced through the femoral artery. The same SA (dpm/μmol) was found in the CA and FA, indicating adequate mixing of newly infused tracer with trace. Three dogs showed differences between SVC, IVC and PA, suggesting a mixed venous sample can not be obtained from the VC. When the catheter was moved into the aorta, wide differences in SA appeared between the CA and FA, clearly reflecting streaming of tracer. These differences also appeared in the SVC and IVC. In conclusion, adequate mixing does not occur between tracer and trace in arterial blood with aortic infusion. Further, VC sampling will not give a consistent mixed venous SA. Therefore, for practical reasons, aortic tracer infusion with vena caval sampling will lead to erroneous turnover values

  2. Tracer transport in fractured rocks

    International Nuclear Information System (INIS)

    Tsang, C.F.; Tsang, Y.W.; Hale, F.V.

    1988-07-01

    Recent interest in the safety of toxic waste underground disposal and nuclear waste geologic repositories has motivated many studies of tracer transport in fractured media. Fractures occur in most geologic formations and introduce a high degree of heterogeneity. Within each fracture, the aperture is not constant in value but strongly varying. Thus for such media, tracer tends to flow through preferred flowpaths or channels within the fractures. Along each of these channels, the aperture is also strongly varying. A detailed analysis is carried out on a 2D single fracture with variable apertures and the flow through channels is demonstrated. The channels defined this way are not rigidly set pathways for tracer transport, but are the preferred flow paths in the sense of stream-tubes in the potential theory. It is shown that such variable-aperture channels can be characterized by an aperture probability distribution function, and not by the exact deterministic geometric locations. We also demonstrate that the 2D tracer transport in a fracture can be calculated by a model of a system of 1D channels characterized by this distribution function only. Due to the channeling character of tracer transport in fractured rock, random point measurements of tracer breakthrough curves may give results with a wide spread in value due to statistical fluctuations. The present paper suggests that such a wide spread can probably be greatly reduced by making line/areal (or multiple) measurements covering a few spatial correlation lengths. 13 refs., 11 figs., 1 tab

  3. Measurement of open streams by using tracers

    International Nuclear Information System (INIS)

    Ramos, German F.; Tarquino, W.; Curcuy, H.; Orozco, C.

    1999-01-01

    This paper presents an intercomparison study to be carried out between flux measurements by using tracers and moulinet. This intercomparison is scheduled to be performed at the measurement station belonging to the National Service of Meteorology and Hydrology (SENAMHI). Two techniques of tracer dilution are outstanded: total evaluation with tracer punctual injection and punctual evaluation with tracer continuous injection. Total evaluation with tracer punctual injection has been used since this technique is considered to be more suitable for hydrology purposes

  4. 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)

  5. Controlling applied to information processing: quality management applied to IP projects and IP services; Informationsverarbeitungs-Controlling: Qualitaetsmanagement fuer IV-Projekte und fuer IV-Service

    Energy Technology Data Exchange (ETDEWEB)

    Becker, B. [Vereinigung Deutscher Elektrizitaetswerke e.V. (VDEW), Frankfurt am Main (Germany); Beckers, F. [Isar-Amperwerke AG, Muenchen (Germany); Dewald, N. [Bayernwerk AG, Muenchen (Germany); Hauffe, P. [Pfalzwerke AG, Ludwigshafen am Rhein (Germany); Hein, F. [EVS AG Stuttgart (Germany); Hoederath, M. [Vereinigte Elektrizitaetswerke Westfalen AG (VEW), Dortmund (Germany); Seyen, R. [Staedtische Werke Nuernberg GmbH (Germany)

    1998-01-12

    The working group on information processing (IP) basics (in German: `IV-Grundlagen`) has prepared this contribution dealing with controlling applied to information processing. This new report, on the one hand, takes into consideration the role of the organizational IP unit as one offering its services to all sections of a company. On the other hand, information processing as an operational infrastructure influencing all business processes becomes increasingly important with respect to the competitiveness of the EVU. Therefore, quality management applied to IP projects and IP services must support this development. (orig./RHM) [Deutsch] Der VDEW Arbeitskreis `IV-Grundlagen` hat einen Beitrag zum Controlling fuer die Informationsverarbeitung erstellt. Hier geht zum einen die Rolle der Organisationseinheit IV als Dienstleister fuer alle Unternehmensbereiche ein. Zum anderen gewinnt die Informationsverarbeitung als betriebliche Infrastruktur fuer alle Geschaeftsprozesse zunehmende Bedeutung fuer die Wettbewerbsfaehigkeit der EVU. Das Qualitaetsmanagement fuer IV-Projekte und fuer IV-Service muss dies unterstuetzen. (orig./RHM)

  6. Radioactive tracers in the sea

    International Nuclear Information System (INIS)

    Jenkins, W.J.; Livingston, H.D.

    1980-01-01

    Artificial radionuclides introduced to the oceans during the last four decades have proved invaluable tools for study of many processes in marine water columns and sediments. Both global and close-in fallout of radioactivity from atmospheric nuclear weapons testing have distributed these radionuclides widely, and in amounts sufficient to be useful as tracers. An additional source of considerable significance and tracer potential comes from coastal discharges of European nuclear fuel reprocessing wastes. The nature of these sources, types and amounts of radionuclides introduced and the time histories of their introduction generate a variety of tracer distributions which illuminate a broad spectrum of physical and chemical processes active over a wide range of timescales. Depending on their respective chemistries, artificial radionuclides have been demonstrated to exhibit both conservative and non-conservative properties in the oceans. Some examples are given of the uses made of soluble, conservative tracers for the study of oceanic transport processes and of non-conservative tracers for studies of processes which move them to, and mix them within, marine sediments. Sampling and measurement techniques which have been used in these studies are described

  7. Hydraulic characterisation of karst systems with man-made tracers; Hydraulische Charakterisierung von Karstsystemen mit kuenstlichen Tracern

    Energy Technology Data Exchange (ETDEWEB)

    Werner, A.

    1998-07-01

    Tracer experiments using man-made tracers are common in hydrogeological exploration of groundwater aquifers in karst systems. In the present investigation, a convection-dispersion model (multidispersion model with consideration of several flow paths) and a single-cleft model (consideration of the diffusion between the cleft and the surrounding rock matrix) were used for evaluating tracer experiments in the main hydrological system of the saturated zone of karst systems. In addition to these extended analytical solutions, a numerical transport model was developed for investigating the influence of the transient flow rate on the flow and transport parameters. Comparative evaluations of the model approaches for the evaluation of tracer experiments were made in four different karst systems: Danube-Aach, Paderborn, Slowenia and Lurbach, of which the Danube-Aach system was considered as the most important. The investigation also comprised three supplementary experiments in order to enable a complete hydraulic characterisation of the system. (orig./SR) [Deutsch] Tracerversuche mit kuenstlichen Tracern sind eine haeufig eingesetzte Methode zur hydrogeologischen Erkundung von Karstgrundwasserleitern. In der vorliegenden Arbeit werden fuer die Auswertung von Tracerversuchen im Hauptfliesssystem der gesaettigten Zone von Karstsystemen ein Konvektion-Dispersions-Modell (Multi-Dispersions-Modell: Beruecksichtigung mehrerer Fliesswege) und vergleichend ein Einzelkluftmodell (Beruecksichtigung der Diffusion zwischen Kluft und umgebender Gesteinsmatrix) eingesetzt. Zusaetzlich zu diesen erweiterten analytischen Loesungen wurde ein numerisches Transportmodell entwickelt, welches ermoeglicht, den Einfluss der instationaeren Fliessrate auf die Stroemungs- und Transportparameter zu ueberpruefen. Die vergleichende Anwendung der Modellansaetze fuer die Auswertung von Tracerversuchen erfolgte in den vier verschiedenen Karstsystemen Donau-Aach, Paderborn, Slowenien und Lurbachsystem. Der

  8. Radiochemical tracers in marine biology

    International Nuclear Information System (INIS)

    Petrocelli, S.R.; Anderson, J.W.; Neff, J.M.

    1977-01-01

    Tracers have been used in a great variety of experimentation. More recently, labeled materials have been applied in marine biological research. Some of the existing tracer techniques have been utilized directly, while others have been modified to suit the specific needs of marine biologists. This chapter describes some of the uses of tracers in marine biological research. It also mentions the problems encountered as well as offering possible solutions and discusses further applications of these techniques. Only pertinent references are cited and additional information may be obtained by consulting these references. Due to their relative ease of maintenance, freshwater species are also utilized in studies which involve radiotracer techniques. Since most of these techniques e directly applicable to marine species, some of these studies will also be included

  9. Radioisotope tracer applications in industry

    International Nuclear Information System (INIS)

    Rao, S.M.

    1987-01-01

    Radioisotope tracers have many advantages in industrial trouble-shooting and studies on process kinetics. The applications are mainly of two types: one leading to qualitative (Yes or No type) information and the other to quantitative characterisation of flow processes through mass balance considerations and flow models. ''Yes or No'' type methods are mainly used for leakage and blockage locations in pipelines and in other industrial systems and also for location of water seepage zones in oil wells. Flow measurements in pipelines and mercury inventory in electrolytic cells are good examples of tracer methods using the mass balance approach. Axial dispersion model and Tanks-in-Series model are the two basic flow models commonly used with tracer methods for the characterisation of kinetic processes. Examples include studies on flow processes in sugar crystallisers as well as in a precalcinator in a cement plant. (author). 18 figs

  10. Tracers of cancer cells in nuclear oncology

    International Nuclear Information System (INIS)

    Tamgac, F.; Baillet, G.; Moretti, J.L.; Safi, N.; Weinmann, P.; Beco, V. de

    1997-01-01

    Evaluating the extent of disease is important in planning cancer treatment. Different types of tracers are used in vivo to diagnose tumors and these tracers can give supplementary information on the differentiation degree of tumors and response to therapy. (authors)

  11. 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.

  12. 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.

  13. New SPECT tracers: Example of tracers of proteoglycans and melanin

    International Nuclear Information System (INIS)

    Cachin, F.; Mestas, D.; Kelly, A.; Merlin, C.; Veyre, A.; Maublant, J.; Cachin, F.; Chezal, J.M.; Miot-Noirault, E.; Moins, N.; Auzeloux, P.; Vidal, A.; Bonnet-Duquennoy, M.; Boisgard, S.; D'Incan, M.; Madelmont, J.C.; Maublant, J.; Boisgard, S.; D'Incan, M.; Redini, F.; Filaire, M.

    2009-01-01

    The majority of research program on new radiopharmaceuticals turn to tracers used for positron emission tomography (PET). Only a few teams work on new non fluorine labeled tracers. However, the coming of SPECT/CT gamma cameras, the arrival of semi-conductors gamma cameras should boost the development of non-PET tracers. We exhibit in this article the experience acquired by our laboratory in the conception and design of two new non fluorine labelled compounds. The 99m Tc-N.T.P. 15-5 (N.T.P. 15-5 for N-[tri-ethyl-ammonium]-3-propyl-[15]ane-N5) which binds to proteoglycans could be used for the diagnosis and staging of osteoarthritis and chondrosarcoma. The iodo benzamides, specific to the melanin, are nowadays compared to 18 F-fluorodeoxyglucose in a phase III clinical trial for the diagnosis and detection of melanoma metastasis. Our last development focus on N-[2-(diethyl-amino)ethyl]-4 and 2-iodo benzamides respectively B.Z.A. and B.Z.A.2 hetero-aromatic analogues usable for melanoma treatment. (authors)

  14. Fifty years of radiochemical tracers

    International Nuclear Information System (INIS)

    Evans, E.A.

    1992-01-01

    During the past 50 years radiochemical tracers, usually in the form of isotopically labelled organic compounds, have been essential tools to further advance our knowledge at the frontiers of a great variety of scientific developments in the life sciences. This plenary lecture reviews necessarily selected highlights in the synthesis and applications of such radiochemical tracers. Included are examples where important advances, made possible by using radiochemicals, have contributed to improving the quality of life on this planet. The principal radioisotopes involved, 14 C, 3 H, 35 S, 32 P, 125 I, are all relatively safe to handle and are commercially available at maximum theoretical specific activity (carrier free). The compounds labeled with these radioisotopes are used in many fields of research which include biosynthesis and biotechnology studies, cell biology, drug metabolism, clinical research and environmental applications, and are briefly reviewed. (author). 55 refs

  15. Tracer techniques in food industry

    International Nuclear Information System (INIS)

    Pertsovskij, E.S.; Sakharov, Eh.V.; Dolinin, V.A.

    1980-01-01

    The appicability of radioactive tracer techniques to process control in food industry are considered. Investigations in the field of food industry carried out using the above method are classified. The 1 class included investigations with preliminary preparation of a radioactive indicator and its following introduction in the system studied. The 2 class includes investigations based on the introduction in the system studied of a non-active indicator which is activated in a neutron flux being in samples selected in or after the process investigated. The 3 class includes studies based on investigations of natural radioactivity of certain nuclides in food stuff. The application of tracer techniques to the above classes of investigations in various fields of food industry and the equipment applied are considered in detail [ru

  16. The Accurate Particle Tracer Code

    OpenAIRE

    Wang, Yulei; Liu, Jian; 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, fusio...

  17. EMUs for the Oeresund link; Elektrische Triebzuege fuer die Oeresundverbindung

    Energy Technology Data Exchange (ETDEWEB)

    Bengtsson, J.E. [Bombardier Transportation GmbH, Vaesteraas (Sweden)

    2001-07-01

    Danish and Swedish Railways jointly purchased new EMUs type Contessa for the Oresund Link, starting operation in summer 2000. By high acceleration the three car electric multiple units reach a top speed of 180 km/h. Several EMUs can be coupled quickly to the Flexfrontsystem technology. Further special features are equipments for two different line voltages as well as for two signalling and automatic train control systems and a low floor part. (orig.) [German] Die daenische und die schwedische Eisenbahn haben gemeinsam fuer die Oresund-Verbindung neue dreiteilige Triebzuege Contessa beschafft und im Sommer 2000 in Betrieb genommen. Die elektrischen Triebzuege erreichen mit hoher Beschleunigung 180 km/h Hoechstgeschwindigkeit und koennen dank des Flexfrontsystems schnell zu mehreren gekuppelt werden. Weitere Merkmale sind die Ausruestungen fuer zwei Fahrleitungsspannungen, zwei Signal- und Zugbeeinflussungssysteme sowie ein Niederflurbereich. (orig.)

  18. Doublet Tracer Testing in Klamath Falls, Oregon

    Energy Technology Data Exchange (ETDEWEB)

    Gudmundsson, J.S.; Johnson, S.E.; Horne, R.N.; Jackson, P. B. [Pet. Eng. Dept., Stanford University; Culver, G.G. [Geo-Heat Center, Oregon Institute of Technology, Klamath Falls, OR

    0001-01-01

    A tracer test was carried out in a geothermal doublet system to study the injection behavior of a developed reservoir known to be fractured. The doublet produces about 320 gpm of 160 degrees Fahrenheit water that is used for space heating and then injected; the wells are spaced 250 ft apart. Tracer breakthrough was observed in 2 hours and 45 minutes in the production well, indicating fracture flow. However, the tracer concentrations were low and indicated porous media flow; the tracers mixed with a reservoir volume much larger than a fracture.

  19. Doublet Tracer Testing in Klamath Falls, Oregon

    Energy Technology Data Exchange (ETDEWEB)

    Gudmundsson, J S; Johnson, S E; Horne, R N; Jackson, P B [Pet. Eng. Dept., Stanford University; Culver, G G [Geo-Heat Center, Oregon Institute of Technology, Klamath Falls, OR

    0000-12-30

    A tracer test was carried out in a geothermal doublet system to study the injection behavior of a developed reservoir known to be fractured. The doublet produces about 320 gpm of 160 degrees Fahrenheit water that is used for space heating and then injected; the wells are spaced 250 ft apart. Tracer breakthrough was observed in 2 hours and 45 minutes in the production well, indicating fracture flow. However, the tracer concentrations were low and indicated porous media flow; the tracers mixed with a reservoir volume much larger than a fracture.

  20. Tracer a application in marine outfall studies

    International Nuclear Information System (INIS)

    Genders, S.

    1979-01-01

    The applicability of radioactive and fluorescent tracers for field studies to predict or investigate waste water transport and dispersion from marine outfalls is evaluated. The application of either instantaneous or continuous tracer release, 'in situ' detection of tracers and data processing are considered. The necessity of a combined use of tracer techniques and conventional hydrographic methods for a statistical prediction of transport and dillution of waste water are pointed out. A procedure to determine an outlet distance from the coast, which satisfy bathing water criteria is outlined. (M.A.) [pt

  1. Principles and techniques of gamma ray tracers

    International Nuclear Information System (INIS)

    Claxton, K.T.

    1978-01-01

    Radioactive tracer techniques provide a very sensitive means of studying physical and chemical processes in a whole variety of different media. Some of the techniques and principles of radioactive tracers and their application to practical engineering systems are discussed. Information which has been found useful in the design of high temperature liquid sodium facilities employing radio-tracers, is presented. The report deals solely with the use of gamma-emitting species as the tracer. These find particular application for in-situ studies on engineering systems where the highly penetrating properties of gamma rays are needed for detection through strongly absorbent media such as stainless steel pepe walls. (author)

  2. Use of artificial tracers in hydrology

    International Nuclear Information System (INIS)

    1991-05-01

    The IAEA has convened an Advisory Group Meeting with the following objectives: To define the role of artificial radioactive tracers for water tracing in comparison with other non-radioactive tracers. To evaluate the real needs of artificial radioactive tracers in hydrology. To identify the fields for which artificial radioactive tracers are useful as well as those in which they can be substituted by other tracers. To discuss the strategy to be adopted to overcome the difficulties derived from the restrictions on the use of radioactive tracers in hydrology. The meeting was held at IAEA Headquarters from 19 to 22 March 1990, and was attended by 30 participants from 15 Member States. The conclusions and recommendations are that the use of artificial radioactive tracers should be restricted to cases where other tracers cannot be used or do not provide the same quality of information. Tritium, iodine-131, bromine-82, chromium-51 in the form of Cr-EDTA, technetium-99m obtained from 99 Mo-generators and gold-198 as an adsorbable tracer are, practically, the only radionuclides used for water tracing. The use of other radionuclides for this purpose does not appear to be necessary, possible and/or convenient. Refs, figs and tabs

  3. Quadratic tracer dynamical models tobacco growth

    International Nuclear Information System (INIS)

    Qiang Jiyi; Hua Cuncai; Wang Shaohua

    2011-01-01

    In order to study the non-uniformly transferring process of some tracer dosages, we assume that the absorption of some tracer by tobacco is a quadratic function of the tracer quantity of the tracer in the case of fast absorption, whereas the exclusion of the tracer from tobacco is a linear function of the tracer quantity in the case of slow exclusion, after the tracer is introduced into tobacco once at zero time. A single-compartment quadratic dynamical model of Logistic type is established for the leaves of tobacco. Then, a two-compartment quadratic dynamical model is established for leaves and calms of the tobacco. Qualitative analysis of the models shows that the tracer applied to the leaves of the tobacco is excluded finally; however, the tracer stays at the tobacco for finite time. Two methods are also given for computing the parameters in the models. Finally, the results of the models are verified by the 32 P experiment for the absorption of tobacco. (authors)

  4. 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)

  5. Nanoparticle tracers in calcium carbonate porous media

    KAUST Repository

    Li, Yan Vivian; Cathles, Lawrence M.; Archer, Lynden A.

    2014-01-01

    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

  6. Tracer filamentation at an unstable ocean front

    Science.gov (United States)

    Feng, Yen Chia; Mahadevan, Amala; Thiffeault, Jean-Luc; Yecko, Philip

    2017-11-01

    A front, where two bodies of ocean water with different physical properties meet, can become unstable and lead to a flow with high strain rate and vorticity. Phytoplankton and other oceanic tracers are stirred into filaments by such flow fields, as can often be seen in satellite imagery. The stretching and folding of a tracer by a two-dimensional flow field has been well studied. In the ocean, however, the vertical shear of horizontal velocity is typically two orders of magnitude larger than the horizontal velocity gradient. Theoretical calculations show that vertical shear alters the way in which horizontal strain affects the tracer, resulting in thin, sloping structures in the tracer field. Using a non-hydrostatic ocean model of an unstable ocean front, we simulate tracer filamentation to identify the effect of vertical shear on the deformation of the tracer. In a complementary laboratory experiment, we generate a simple, vertically sheared strain flow and use dye and particle image velocimetry to quantify the filamentary structures in terms of the strain and shear. We identify how vertical shear alters the tracer filaments and infer how the evolution of tracers in the ocean will differ from the idealized two-dimensional paradigm. Support of NSF DMS-1418956 is acknowledged.

  7. Dynamic dual-tracer PET reconstruction.

    Science.gov (United States)

    Gao, Fei; Liu, Huafeng; Jian, Yiqiang; Shi, Pengcheng

    2009-01-01

    Although of important medical implications, simultaneous dual-tracer positron emission tomography reconstruction remains a challenging problem, primarily because the photon measurements from dual tracers are overlapped. In this paper, we propose a simultaneous dynamic dual-tracer reconstruction of tissue activity maps based on guidance from tracer kinetics. The dual-tracer reconstruction problem is formulated in a state-space representation, where parallel compartment models serve as continuous-time system equation describing the tracer kinetic processes of dual tracers, and the imaging data is expressed as discrete sampling of the system states in measurement equation. The image reconstruction problem has therefore become a state estimation problem in a continuous-discrete hybrid paradigm, and H infinity filtering is adopted as the estimation strategy. As H infinity filtering makes no assumptions on the system and measurement statistics, robust reconstruction results can be obtained for the dual-tracer PET imaging system where the statistical properties of measurement data and system uncertainty are not available a priori, even when there are disturbances in the kinetic parameters. Experimental results on digital phantoms, Monte Carlo simulations and physical phantoms have demonstrated the superior performance.

  8. Tracer diffusion in ternary alloys

    International Nuclear Information System (INIS)

    Tahir-Kheli, R.A.

    1985-07-01

    An intuitive extension of the theory for diffusion in dynamic binary alloys given in the preceding paper is presented. This theory has also received an independent derivation, based on more formal procedures, by Holdsworth and Elliott. We present Monte Carlo estimates for diffusion correlation factors, fsup(A), fsup(B), and fsup(C) and compare them with the theory. The agreement between the theoretical results and the Monte Carlo estimates for the correlation factors of the slow particles, i.e., fsup(C) and fsup(B), is found to be generally good. In contrast, for the correlation factor, fsup(A), referring to the diffusion coefficient of fast particles in the system, the theoretical results are found to be systematically lower by a small but resolvable margin. It is suggested that this is occasioned by the neglect of spatial constraints on the scattering of coupled tracer-background particle field pairs. (author)

  9. Transuranic and tracer simulant resuspension

    International Nuclear Information System (INIS)

    Sehmel, G.A.

    1977-07-01

    Plutonium resuspension results are summarized for experiments conducted at Rocky Flats, onsite on the Hanford reservation, and for winds blowing from offsite onto the Hanford reservation near the Prosser barricade boundary. In each case, plutonium resuspension was shown by increased airborne plutonium concentrations as a function of either wind speed or as compared to fallout levels. All measured airborne concentrations were below maximum permissible concentrations (MPC). Both plutonium and cesium concentrations on airborne soil were normalized by the quantity of airborne soil sampled. Airborne radionuclide concentrations in μCi/g were related to published values for radionuclide concentrations on surface soils. For this ratio of radionuclide concentration per gram on airborne soil divided by that for ground surface soil, there are eight orders of magnitude uncertainty from 10 -4 to 10 4 . Horizontal plutonium fluxes on airborne nonrespirable soils at all three sites were bracketed within the same three to four orders of magnitude from 10 -7 to 10 -3 μCi/(m 2 day) for plutonium-239 and 10 -8 to 10 -5 μCi/(m 2 day) for plutonium-238. These are the entire experimental base for nonrespirable airborne plutonium transport. Airborne respirable plutonium-239 concentrations increased with wind speed for a southeast wind direction coming from offsite near the Hanford reservation Prosser barricade. Airborne plutonium fluxes on nonrespirable particles had isotopic ratios, 240 Pu/ 239+240 Pu, similar to weapons grade plutonium rather than fallout plutonium. Resuspension rates were summarized for controlled inert particle tracer simulant experiments. Wind resuspension rates for tracers increased with wind speed to about the fifth power

  10. 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.

  11. Pleading for a rational energy policy; Fuer eine aufgeklaerte Energiepolitik

    Energy Technology Data Exchange (ETDEWEB)

    Tillessen, U. [Colenco Power Consulting AG, Baden (Switzerland)

    1999-09-01

    To the argument that the long half-life values of the most important products of fission represent an unacceptable burden for coming generations, the author retorts that this is an emotion-directed pseudo-argument. Anyone who ventures into deep geological strata, such as the final storage area Konrad, should also count in terms of geological periods. From this point of view, a million years - however difficult to imagine for the average human being - is not a very long time. Toxic chemical waste is accepted by society, even if the toxicity should remain for all time. The article is an extract from a lecture given by the author to the Franco-German Society for Science and Technology. (orig.) [German] Dem Argument, die langen Halbwertszeiten der wichtigsten Spaltprodukte beinhalte eine nicht zu verantwortende Belastung fuer die nachfolgenden Generationen, haelt Autor Tillessen entgegen, dass dies ein auf Emotionen abzielendes Scheinargument sei. Wer sich, wie zum Beispiel beim Endlager Konrad, in tiefe geologische Schichten begebe, duerfe auch in geologischen Zeitraeumen rechnen. Und da sei eine Million Jahre, so wenig vorstellbar das auch fuer den Durchschnitts-Menschen sei, eben keine allzulange Zeit. Chemische Giftabfaelle wuerden von der Gesellschaft akzeptiert, obwohl ihre Toxitaet ewig waehre. Der Beitrag des Autors ist ein Auszug aus einer Rede, die er vor der Deutsch-Franzoesischen Gesellschaft fuer Wissenschaft und Technik gehalten hat. Aus diesem Anlass hatte Tillessen vorgeschlagen, ein von einer Stiftung getragenes deutsch-franzoesisches Institut zu gruenden, dessen Aufgabe es sein soll, mit mehr Rationalitaet die von teutonischer Romantik dominierte Technikdiskussion zu versachlichen. (orig.)

  12. Meteorological systems for hydrological applications; Meteorologische Systeme fuer hydrologische Anwendungen

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1993-12-31

    The development of hydrology with its many practical applications in water management has led to a great demand for hydrometeorological data, variables derived from meteorological measurements, and models. The report shows the many fields in which meteorological data are required in hydrology and water management. Measuring networks and methods are described and critically assessed, including remote measurement by radar and satellite. For the hydrologist, the most important variables to be derived are the regional precipitation and evaporation, each with the error source and size. Other factors of interest are the snowbreak, the expected maximum precipitation (rain), the statistical derivation of strong rain, and regionalisation methods for all variables derived. These methods are presented. The possibilities of meteorology, especially (WMO) in the field of data transmission systems are assessed. (orig./KW) [Deutsch] Die Entwicklung der Hydrologie mit ihren zahlreichen wasserwirtschaftlichen Anwendungen hat zu einem grossen Bedarf an hydrometeorologischen Daten, aus meteorologischen Messungen abgeleiteten Groessen und auch an Modellen gefuehrt. Wo ueberall sich ein Bedarf an meteorologischen Daten in Hydrologie und Wasserwirtschaft eingestellt hat, ist in diesem Bericht zusammengefasst. Es werden die verschiedenen Messnetze und Messverfahren beschrieben und kritisch beurteilt, auch die Radar- und Satellitenfernerkundung gehoeren dazu. Fuer den Hydrologen zaehlt zu den wichtigsten abgeleiteten Groessen der Gebietsniederschlag und die Gebietsverdunstung, jeweils mit Angabe von Fehlerquelle und Fehlerschwankung. Von Interesse sind auch die Schneeschmelze, der vermutlich maximale Niederschlag (Regen), die statistische Ableitung von Starkregen und Regionalisierungsmethoden aller abgeleiteten Groessen. Diese Verfahren werden vorgestellt. Die quantitative Niederschlagsvorhersage wird wegen ihrer Bedeutung fuer die operationellen hydrologischen Vorhersagen eingehend

  13. Tracers vs. trajectories in a coastal region

    Science.gov (United States)

    Engqvist, A.; Döös, K.

    2008-12-01

    Two different methods of estimating the water exchange through a Baltic coastal region have been used, consisting of particle trajectories and passive tracers. Water is traced from and to a small discharge region near the coast. The discharge material in this region is treated as zero dimensional particles or tracers with neutral buoyancy. The real discharge material could be a leakage of radio-nuclides through the sea floor from an underground repository of nuclear waste. Water exchange rates between the discharge region and the model domain are estimated using both forward and backward trajectories as well as passive tracers. The Lagrangian trajectories can account for the time evolution of the water exchange while the tracers give one average age per model grid box. Water exchange times such as residence time, age and transient times have been calculated with trajectories but only the average age (AvA) for tracers. The trajectory calculations provide a more detailed time evolution than the tracers. On the other hand the tracers are integrated "on-line" simultaneously in the sea circulation model with the same time step while the Lagrangian trajectories are integrated "off-line" from the stored model velocities with its inherent temporal resolution, presently one hour. The sub-grid turbulence is parameterised as a Laplacian diffusion for the passive tracers and with an extra stochastic velocity for trajectories. The importance of the parameterised sub-grid turbulence for the trajectories is estimated to give an extra diffusion of the same order as the Laplacian diffusion by comparing the Lagrangian dispersions with and without parameterisation. The results of the different methods are similar but depend on the chosen diffusivity coefficient with a slightly higher correlation between trajectories and tracers when integrated with a lower diffusivity coefficient.

  14. 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

  15. Bundesamt fuer Strahlenschutz (BfS). Annual report 1991

    International Nuclear Information System (INIS)

    1992-08-01

    The progress report submitted by Bundesamt fuer Strahlenschutz reveals that this federal radiation protection agency is not only entrusted with the fulfillment of the federal administrative tasks imposed by law but engages in applications-oriented research regarding the operational, metrological and health-related aspects of radiation protection, regarding nuclear safety and radioactive waste management. In addition, BfS takes care of public-relations tasks. The reports submitted by the BfS departments are completed by summaries of the main research results. (DG) [de

  16. Statistically Based Morphodynamic Modeling of Tracer Slowdown

    Science.gov (United States)

    Borhani, S.; Ghasemi, A.; Hill, K. M.; Viparelli, E.

    2017-12-01

    Tracer particles are used to study bedload transport in gravel-bed rivers. One of the advantages associated with using of tracer particles is that they allow for direct measures of the entrainment rates and their size distributions. The main issue in large scale studies with tracer particles is the difference between tracer stone short term and long term behavior. This difference is due to the fact that particles undergo vertical mixing or move to less active locations such as bars or even floodplains. For these reasons the average virtual velocity of tracer particle decreases in time, i.e. the tracer slowdown. In summary, tracer slowdown can have a significant impact on the estimation of bedload transport rate or long term dispersal of contaminated sediment. The vast majority of the morphodynamic models that account for the non-uniformity of the bed material (tracer and not tracer, in this case) are based on a discrete description of the alluvial deposit. The deposit is divided in two different regions; the active layer and the substrate. The active layer is a thin layer in the topmost part of the deposit whose particles can interact with the bed material transport. The substrate is the part of the deposit below the active layer. Due to the discrete representation of the alluvial deposit, active layer models are not able to reproduce tracer slowdown. In this study we try to model the slowdown of tracer particles with the continuous Parker-Paola-Leclair morphodynamic framework. This continuous, i.e. not layer-based, framework is based on a stochastic description of the temporal variation of bed surface elevation, and of the elevation specific particle entrainment and deposition. Particle entrainment rates are computed as a function of the flow and sediment characteristics, while particle deposition is estimated with a step length formulation. Here we present one of the first implementation of the continuum framework at laboratory scale, its validation against

  17. The accurate particle tracer code

    Science.gov (United States)

    Wang, Yulei; Liu, Jian; Qin, Hong; Yu, Zhi; Yao, Yicun

    2017-11-01

    The Accurate Particle Tracer (APT) code is designed for systematic large-scale applications of geometric algorithms for particle dynamical simulations. 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 nonlinear problems. To provide a flexible and convenient I/O interface, the libraries of Lua and Hdf5 are used. Following a three-step procedure, users can efficiently extend the libraries of electromagnetic configurations, external non-electromagnetic forces, particle pushers, and initialization approaches by use of the extendible module. APT has been used in simulations of key physical problems, such as runaway electrons in tokamaks and energetic particles in Van Allen belt. As an important realization, the APT-SW version has been successfully distributed on the world's fastest computer, the Sunway TaihuLight supercomputer, by supporting master-slave architecture of Sunway many-core processors. Based on large-scale simulations of a runaway beam under parameters of the ITER tokamak, it is revealed that the magnetic ripple field can disperse the pitch-angle distribution significantly and improve the confinement of energetic runaway beam on the same time.

  18. Development of Radioisotope Tracer Technology

    International Nuclear Information System (INIS)

    Jung, Sung Hee; Jin, Joon Ha; Kim, Jong Bum; Kim, Jin Seop; Kim, Jae Jo; Park, Soon Chul; Lim, Don Soon; Choi, Byung Jong; Jang, Dong Soon; Kim, Hye Sook

    2007-06-01

    The project is aimed to develop the radiotracer technology for process optimization and trouble-shooting to establish the environmental and industrial application of radiation and radioisotopes. The advanced equipment and software such as high speed data acquisition system, RTD model and high pressure injection tool have developed. Based on the various field application to the refinery/petrochemical industries, the developed technology was transfer to NDT company for commercial service. For the environmental application of radiotracer technology, injector, detector sled, core sampler, RI and GPS data logging system are developed and field tests were implemented successfully at Wolsung and Haeundae beach. Additionally tracer technology were also used for the performance test of the clarifier in a wastewater treatment plant and for the leak detection in reservoirs. From the experience of case studies on radiotracer experiment in waste water treatment facilities, 'The New Excellent Technology' is granted from the ministry of environment. For future technology, preliminary research for industrial gamma transmission and emission tomography which are new technology combined with radioisotope and image reconstruction are carried out

  19. 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 ...

  20. 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)

  1. Tracer surface diffusion on UO2

    International Nuclear Information System (INIS)

    Zhou, S.Y.; Olander, D.R.

    1983-06-01

    Surface diffusion on UO 2 was measured by the spreading of U-234 tracer on the surface of a duplex diffusion couple consisting of wafers of depleted and enriched UO 2 joined by a bond of uranium metal

  2. Exploring Hydrofluorocarbons as Groundwater Age Tracers (Invited)

    Science.gov (United States)

    Haase, K. B.; Busenberg, E.; Plummer, L. N.; Casile, G.; Sanford, W. E.

    2013-12-01

    Groundwater dating tracers are an essential tool for analyzing hydrologic conditions in groundwater systems. Commonly used tracers for dating post-1940's groundwater include sulfur hexafluoride (SF6), chlorofluorocarbons (CFCs), 3H-3He, and other isotopic tracers (85Kr, δ2H and δ18O isotopes, etc.). Each tracer carries a corresponding set of advantages and limitations imposed by field, analytical, and interpretive methods. Increasing the number available tracers is appealing, particularly if they possess inert chemical properties and unique temporal emission histories from other tracers. Atmospherically derived halogenated trace gases continue to hold untapped potential for new tracers, as they are generally inert and their emission histories are well documented. SF5CF3, and CFC-13 were previously shown to have application as dating tracers, though their low mixing ratios and low solubility require large amounts of water to be degassed for their quantification. Two related groups of compounds, hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) are hypothesized to be potential age tracers, having similar mixing ratios to the CFCs and relatively high solubility. However, these compounds yield gas chromatography electron capture detector (GC-ECD) responses that are 10-2 -10-5 less than CFC-12, making purge and trap or field stripping GC-ECD approaches impractical. Therefore, in order to use dissolved HCFCs and HFCs as age tracers, different approaches are needed. To solve this problem, we developed an analytical method that uses an atomic emission detector (GC-AED) in place of an ECD to detect fluorinated compounds. In contrast to the ECD, the AED is a universally sensitive, highly linear, elementally specific detector. The new GC-AED system is being used to measure chlorodifluoromethane (HCFC-22), 1,1,1,2-tetrafluoroethane (HFC-134a), and other fluorinated compounds in one liter water samples to study their potential as age dating tracers. HCFC-22 is a

  3. Radioisotope tracers in industrial flow studies

    International Nuclear Information System (INIS)

    Easey, J.F.

    1987-01-01

    The scope of radioisotope tracer work carried out by ANSTO has involved most sectors of Australian industry including iron and steel coal, chemical, petrochemical, natural gas, metallurgical, mineral, power generation, liquified air plant, as well as port authorities, water and sewerage instrumentalities, and environmental agencies. A major class of such studies concerns itself with flow and wear studies involving industrial equipment. Some examples are discussed which illustrate the utility of radioisotope tracer techniques in these applications

  4. 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.

  5. ISH. HVAC engineering yearbook 1999; ISH. Jahrbuch fuer Gebaeudetechnik 1999

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    1999-11-01

    The 1999 HVAC engineering yearbook contains contributions on energy conservation and optimization in the fields of ventilation and air conditioning: inter alia, solar cooling and air conditioning, optimum rating of ventilator units, and cooling ceilings with ventilation function. In the field of heating, the following topics are addressed, equally under the aspect of energy conservation: condensing boiler technology, hydraulic balancing of heating pipe systems and sequential boiler switching using fuzzy control. Further works deal with rational use of electricity in buildings, and building automation. 17 papers are individually listed in the Energy database. [Deutsch] Das Jahrbuch fuer Gebaeudetechnik 1999 enthaelt Beitraege zur Energieeinsparung und Optimierung auf den Gebieten Lueftung und Klimatisierung, u. a. solare Kuehlung und Klimatisierung, optimale Auslegung von Ventilator-Aggregaten und Kuehldecken mit Lueftungsfunktion. Auf dem Gebiet der Heizung werden ebenfalls unter dem Gesichtspunkt Energieeinsparung die Brennwerttechnologie, der hydraulische Abgleich von Heizungsrohrnetzen sowie Kesselfolgeschaltungen mit Fuzzy Control angesprochen. Weitere Arbeiten befassen sich mit der rationellen Elektrizitaetsverwendung in Geb auden sowie der Gebaeudeautomation. Fuer die Datenbank Energy wurden 17 Arbeiten separat aufgenommen.

  6. Improving Marine Ecosystem Models with Biochemical Tracers

    Science.gov (United States)

    Pethybridge, Heidi R.; Choy, C. Anela; Polovina, Jeffrey J.; Fulton, Elizabeth A.

    2018-01-01

    Empirical data on food web dynamics and predator-prey interactions underpin ecosystem models, which are increasingly used to support strategic management of marine resources. These data have traditionally derived from stomach content analysis, but new and complementary forms of ecological data are increasingly available from biochemical tracer techniques. Extensive opportunities exist to improve the empirical robustness of ecosystem models through the incorporation of biochemical tracer data and derived indices, an area that is rapidly expanding because of advances in analytical developments and sophisticated statistical techniques. Here, we explore the trophic information required by ecosystem model frameworks (species, individual, and size based) and match them to the most commonly used biochemical tracers (bulk tissue and compound-specific stable isotopes, fatty acids, and trace elements). Key quantitative parameters derived from biochemical tracers include estimates of diet composition, niche width, and trophic position. Biochemical tracers also provide powerful insight into the spatial and temporal variability of food web structure and the characterization of dominant basal and microbial food web groups. A major challenge in incorporating biochemical tracer data into ecosystem models is scale and data type mismatches, which can be overcome with greater knowledge exchange and numerical approaches that transform, integrate, and visualize data.

  7. 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.

  8. Proceedings of Tracer 3. International Conference on Tracers and Tracing Methods

    International Nuclear Information System (INIS)

    2004-01-01

    Tracer 3 conference is a continuation of former Tracer 1 (1998) and Tracer 2 (2001) conferences organized by CNRS - Nancy France. The objective of this 3rd conference is presentation of different aspects of tracer method applications and development of tracer methodology.The new field of activity presented at the Conference was application of stable isotopes as natural tracers for investigations of environmental processes. The conference gave the possibility for scientific information exchange between specialists from different fields of activity such as chemical engineering, chemistry, bioengineering, environmental engineering, hydrology, civil engineering, metallurgy, etc. The presentations were divided into groups covering the principal items of Conference. Section A. Fundamental development - RTD and tracer methodology, - RTD methodology and Computational Fluid Dynamics (CFD), - New tracers and detectors. Section B. Industrial applications - Environment, - Geology, hydrogeology and oil field applications, - Civil engineering, mineral engineering and metallurgy applications, - Food engineering and bioengineering, - Material engineering, - Chemical engineering. During the Conference INIS promotion materials were exposed by INIS liaison officer for Poland

  9. Proceedings of Tracer 3. International Conference on Tracers and Tracing Methods

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2004-07-01

    Tracer 3 conference is a continuation of former Tracer 1 (1998) and Tracer 2 (2001) conferences organized by CNRS - Nancy France. The objective of this 3rd conference is presentation of different aspects of tracer method applications and development of tracer methodology.The new field of activity presented at the Conference was application of stable isotopes as natural tracers for investigations of environmental processes. The conference gave the possibility for scientific information exchange between specialists from different fields of activity such as chemical engineering, chemistry, bioengineering, environmental engineering, hydrology, civil engineering, metallurgy, etc. The presentations were divided into groups covering the principal items of Conference. Section A. Fundamental development - RTD and tracer methodology, - RTD methodology and Computational Fluid Dynamics (CFD), - New tracers and detectors. Section B. Industrial applications - Environment, - Geology, hydrogeology and oil field applications, - Civil engineering, mineral engineering and metallurgy applications, - Food engineering and bioengineering, - Material engineering, - Chemical engineering. During the Conference INIS promotion materials were exposed by INIS liaison officer for Poland.

  10. Long residence times - bad tracer tests?

    Science.gov (United States)

    Ghergut, Julia; Behrens, Horst; Sauter, Martin

    2015-04-01

    Tracer tests conducted at geothermal well doublets or triplets in the Upper Rhine Rift Valley [1] all face, with very few exceptions so far, one common issue: lack of conclusive tracer test results, or tracer signals still undetectable for longer than one or two years after tracer injection. While the reasons for this surely differ from site to site (Riehen, Landau, Insheim, Bruchsal, ...), its effects on how the usefulness of tracer tests is perceived by the non-tracer community are pretty much the same. The 'poor-signal' frustration keeps nourishing two major 'alternative' endeavours : (I) design and execute tracer tests in single-well injection-withdrawal (push-pull), 'instead of' inter-well flow-path tracing configurations; (II) use 'novel' tracer substances instead of the 'old' ones which have 'obviously failed'. Frustration experienced with most inter-well tracer tests in the Upper Rhine Rift Valley has also made them be regarded as 'maybe useful for EGS' ('enhanced', or 'engineered' geothermal systems, whose fluid RTD typically include a major share of values below one year), but 'no longer worthwhile a follow-up sampling' in natural, large-scale hydrothermal reservoirs. We illustrate some of these arguments with the ongoing Bruchsal case [2]. The inter-well tracer test conducted at Bruchsal was (and still is!) aimed at assessing inter-well connectivity, fluid residence times, and characterizing the reservoir structure [3]. Fluid samples taken at the geothermal production well after reaching a fluid turnover of about 700,000 m3 showed tracer concentrations in the range of 10-8 Minj per m3, in the liquid phase of each sample (Minj being the total quantity of tracer injected as a short pulse at the geothermal re-injection well). Tracer signals might actually be higher, owing to tracer amounts co-precipitated and/or adsorbed onto the solid phase whose accumulation in the samples was unavoidable (due to pressure relief and degassing during the very sampling

  11. 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

  12. Tracers of air-sea gas exchange

    International Nuclear Information System (INIS)

    Liss, P.S.

    1988-01-01

    The flux of gas across the air-sea interface is determined by the product of the interfacial concentration difference driving the exchange and a rate constant, often termed the transfer velocity. The concentration-difference term is generally obtained by direct measurement, whereas more indirect approaches are required to estimate the transfer velocity and its variation as a function of controlling parameters such as wind and sea state. Radioactive tracers have proved particularly useful in the estimation of air-sea transfer velocities and, recently, stable purposeful tracers have also started to be used. In this paper the use of the following tracers to determine transfer velocities at the sea surface is discussed: natural and bomb-produced 14 C, dissolved oxygen, 222 Rn and sulphur hexafluoride. Other topics covered include the relation between transfer velocity and wind speed as deduced from tracer and wind-tunnel studies, and the discrepancy between transfer velocities determined by using tracers and from eddy correlation measurements in the atmosphere. (author)

  13. 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

  14. Preventive strategy for nanomaterials. Special report; Vorsorgestrategien fuer Nanomaterialien. Sondergutachten

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2012-07-01

    knowledge of which nanomaterials are used in which products. The SRU sees a need for greater transparency here to enable public authorities to react swiftly whenever evidence of health or environmental risks arises. Consumers should in principle enjoy freedom of choice. For this reason the SRU recommends creating a registry of nanoproducts and supplementation of existing labelling requirements. [German] In diesem Sondergutachten gibt der Sachverstaendigenrat fuer Umweltfragen (SRU) Empfehlungen fuer einen verantwortungsvollen, vorsorgeorientierten Umgang mit dieser Technologie. Ziel ist es, Innovationen zu ermoeglichen, aber auch Risiken fruehzeitig zu erkennen und zu mindern. Der SRU sieht dringenden Handlungsbedarf bei der Regulierung von Nanomaterialien und fordert mehr Transparenz bei Verbraucherprodukten ein. Sobald ein begruendeter Anlass zur Besorgnis besteht, muss nach dem Vorsorgeprinzip gehandelt und zwischen Risiken und Chancen abgewogen werden. Um dies zu ermoeglichen, sind zahlreiche rechtliche Aenderungen erforderlich. Nanomaterialien und Nano-Produkte unterliegen grundsaetzlich dem Stoff-, Produkt- und Umweltrecht. In der Praxis fuehren aber die Besonderheiten von Nanomaterialien dazu, dass nicht alle rechtlichen Instrumente greifen. So werden Nanomaterialien bei der Registrierung von Chemikalien und bei der Zulassung von Produkten nicht immer separat erfasst und damit bewertet. Der SRU empfiehlt, solche nanospezifischen Regelungsluecken schnell zu schliessen. Dazu ist es notwendig, Nanomaterialien verbindlich zu definieren, sie grundsaetzlich bei der Risikobewertung von Chemikalien wie eigenstaendige Stoffe zu behandeln und mit einem eigens auf sie zugeschnittenen Datensatz zu registrieren. Dabei duerfen die Risiken von Nanomaterialien nicht pauschal bewertet werden, weil manche Materialien nach heutigem Kenntnisstand unbedenklich sind, waehrend bei anderen ein Risikopotenzial besteht. Einen Anlass zur Besorgnis sieht der SRU vor allem bei der Verwendung von

  15. 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.)

  16. Ageing management of mechanical components; Alterungsmanagement fuer mechanische Komponenten

    Energy Technology Data Exchange (ETDEWEB)

    Hienstorfer, W. [TUeV Energie- und Systemtechnik GmbH, Filderstadt (Germany); Herter, K.H.; Schuler, X. [Materialpruefungsanstalt, Univ. Stuttgart, Stuttgart (Germany)

    2004-07-01

    Lifetime management, ageing management and integrity testing are part of technical rules and specifications. The contribution focuses on ageing management, for which different technical measures are required depending on the safety relevance of the components and systems involved. The procedure for ensuring adherence to the specified quality is outlined, and the required technical and organisational measures are explained. (orig.) [German] In Leitlinien und Regelwerken sind fuer mechanische Komponenten Anforderungen zur Absicherung des Betriebs waehrend der gesamten Lebensdauer (Lebensdauermanagement), zur Absicherung von Alterungsphaenomenen (Alterungsmanagement) als auch zum Nachweis der Integritaet (Integritaetsnachweis, z.B. mit dem Ziel des Bruchausschlusses) enthalten. Ein wesentliches Element stellt dabei das Alterungsmanagement dar. Je nach sicherheitstechnischer Bedeutung der zu betrachtenden Komponenten und Systeme oder auch aus Gruenden der vorbeugenden Instandhaltung sind unterschiedliche technische Massnahmen erforderlich. Die Vorgehensweise zur Absicherung der im Betrieb geforderten Qualitaet wird aufgezeigt und die dabei erforderlichen technischen und organisatorischen Massnahmen werden erlaeutert. (orig.)

  17. Coefficients of tracer transfer through membranes. Pt. 7

    Energy Technology Data Exchange (ETDEWEB)

    Dorabialska, A; Hawlicka, E; Plonka, A [Politechnika Lodzka (Poland)

    1974-01-01

    The doubled value of the tracer transfer coefficient in the self-diffusion process is equal to the sum of tracer transfer coefficients in the diffusion and interfusion processes. The fundamental phenomenological relation can be deduced for the coefficients of tracer transfer between two phases of electrolyte solutions spearated by a virtual boundary. Indeed, the doubled value of the tracer mobility in the self-diffusion experiment (no concentration gradient of the traced substance) is equal to the sum of the tracer mobilities in the diffusion (tracer movement along with the concentration gradient of the traced substance) and interfusion experiments (tracer movement against the concentration gradient of the traced substance). Thus the doubled value of the tracer transfer coefficient in the self-diffusion process should be equal to the sum of tracer transfer coefficients in the diffusion and interfusion processes. The experimental verification of that fundamental relation is presented.

  18. Simulation and interpretation of inter-well tracer tests

    Directory of Open Access Journals (Sweden)

    Dugstad Øyvind

    2013-05-01

    Full Text Available In inter-well tracer tests (IWTT, chemical compounds or radioactive isotopes are used to label injection water and gas to establish well connections and fluid patterns in petroleum reservoirs. Tracer simulation is an invaluable tool to ease the interpretation of IWTT results and is also required for assisted history matching application of tracer data. In this paper we present a new simulation technique to analyse and interpret tracer results. Laboratory results are used to establish and test formulations of the tracer conservation equations, and the technique is used to provide simulated tracer responses that are compared with observed tracer data from an extensive tracer program. The implemented tracer simulation methodology use a fast post-processing of previously simulated reservoir simulation runs. This provides a fast, flexible and powerful method for analysing gas tracer behaviour in reservoirs. We show that simulation time for tracers can be reduced by factor 100 compared to solving the tracer flow equations simultaneously with the reservoir fluid flow equations. The post-processing technique, combined with a flexible built-in local tracer-grid refinement is exploited to reduce numerical smearing, particularly severe for narrow tracer pulses.

  19. 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.

  20. Biological tracer for waste site characterization

    International Nuclear Information System (INIS)

    Strong-Gunderson, J.

    1995-01-01

    Remediating hazardous waste sites requires detailed site characterization. In groundwater remediation, characterizing the flow paths and velocity is a major objective. Various tracers have been used for measuring groundwater velocity and transport of contaminants, colloidal particles, and bacteria and nutrients. The conventional techniques use dissolved solutes, dyes. and gases to estimate subsurface transport pathways. These tracers can provide information on transport and diffusion into the matrix, but their estimates for groundwater flow through fractured regions are very conservative. Also, they do not have the same transport characteristics as bacteria and suspended colloid tracers, both of which must be characterized for effective in-place remediation. Bioremediation requires understanding bacterial transport and nutrient distribution throughout the acquifer, knowledge of contaminants s mobile colloidal particles is just essential

  1. Use of radioactive tracers in dynamic sedimentology

    International Nuclear Information System (INIS)

    Tola, Francois.

    1982-01-01

    In the first part, developments in the use of radioactive tracers in sedimentology are recalled together with the corresponding fields of application and the identities of the main users. The state-of-the-art in France is also discussed; The main characteristics of the method are then described and compared with those of more classical methods. The results that can be obtained with tracer methods are then outlined. The criteria employed to establish the granulometry characteristics of the tracer, the particular radioisotope to be used, and the masses and activities involved, are treated. A list is then given of the main isotopes available in France and their characteristics. The various different labelling techniques employed are studied together with their respective advantages and disadvantages. The special case of pelitic sediments is mentioned. The use of reduced model isotope generators, double labelling and applications to studies of the mud plug in the Gironde Estuary are also discussed. The methods and materials used for injecting and detecting tracers are described, emphasis being given to the economic factors associated with the use of radioactive tracers in sedimentology. The second part of the report contains two chapters: - studies of transport by driftage: presentation and analysis of results and the application of the Count Rate Balance method to obtain quantitative information on transport; - studies of in-suspension transport of fine sediments in the sea: the procedures adopted from the moment when the tracer is introduced up to the time when the results are analyzed and interpreted, enables the trajectories and mean velocities of the transported sediments to be determined together with their degree of dilution and their settling speeds and rates; it is also possible to investigate the evolution and horizontal dispersion of the sediments in this way. Results from recent experiments are presented in both parts of the report

  2. Tracer applications in oil reservoirs in Brazil

    International Nuclear Information System (INIS)

    Moreira, R.M.; Ferreira Pinto, A.M.

    2004-01-01

    Radiotracer applications in oil reservoirs in Brazil started in 1997 at the request of the State Oil Company (Petrobras) at the Carmoplois oilfield. 1 Ci of HTO was injected in a regular five-spot plot and the results obtained were quite satisfactory. Shortly after this test one other request asked for distinguishing the contribution of different injection wells to a production well. It was then realized that other tracers should be available. As a first choice 35 SCN - has been selected since it could be produced at CDTN. An alternative synthesis path was defined which shortened post-irradiation manipulations. The tracer was tested in core samples and a field injection, simultaneously with HTO, was carried out at the Buracica field; again the HTO performed well but 35 SCN - showed up well ahead. Presently the HTO applications are being done on a routine basis. All in all, four tests were performed (some are still ongoing), and the detection limits for both 3 H and 35 S were optimized by refining the sample preparation stage. Lanthanide complexes used as activable tracers are also an appealing option, however core tests performed so far with La-, Ce- and Eu-EDTA indicated some delay of the tracer, so other complexants such as DOTA are to be tried in further laboratory tests and in a field application. Thus, a deeper understanding of their complexation chemistry and carefully conducted tests must be performed before lanthanide complexes can be qualified as reliable oil reservoir tracers. More recently, Petrobras has been asking for partitioning tracers intended for SOR measurement

  3. Geologic flow characterization using tracer techniques

    International Nuclear Information System (INIS)

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

    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

  4. SIMULASI JARINGAN KOMPUTER MENGGUNAKAN CISCO PACKET TRACER

    Directory of Open Access Journals (Sweden)

    M Mufadhol

    2012-01-01

    Full Text Available Perkembangan jaringan komputer saat ini begitu pesat, monitoring jaringan komputer akan menjadi suatu hal yang sulit dan rumit. Koneksi jaringan komputer merupakan suatu hal yang mendasar dalam suatu jaringan, karena bila koneksi itu bermasalah maka semua jenis aplikasi yang dijalankan melalui jaringan komputer tidak dapat digunakan. Cisco packet tracer dapat digunakan untuk simulasi yang mencerminkan arsitektur dan juga model dari jaringan komputer pada sistem jaringan yang digunakan. Dengan menggunakan aplikasi cisco packet tracer, simulasi mengenai jaringan dapat dimanfaatkan menjadi informasi tentang keadaan koneksi komputer dalam suatu jaringan.

  5. Selection of tracers for oil and gas evaluation

    International Nuclear Information System (INIS)

    Bjoernstad, T.

    1991-08-01

    The importance of tracer tests in reservoir descriptions is increasingly acknowledged by reservoir engineers as a method to obtain valuable dynamic information from the reservoir. The report describes the ''state-of-the art'' on tracer technology for interwell investigations. Experiences gained from a number of reported field tracer tests are reviewed, and results from detailed laboratory investigations on the static and dynamic behavior of various tracer molecules are discussed. A critical evaluation of the applicability of the various identified tracers is provided. Present and future trends in the development of tracer technology for reservoir description are sketched. 64 refs., 12 figs., 2 tabs

  6. The Rossendorf research site. The Rossendorf Research Center (FZR). The Rossendorf Verein fuer Kernverfahrenstechnik und Analytik (VKTA). The Rossendorf Foerderverein fuer Wissenschaft, Forschung und Technologie (ROTECH)

    International Nuclear Information System (INIS)

    1995-01-01

    The illustrated brochure presents the Rossendorf research site at a glance. There are two major new establishments, the Rossendorf Research Center and the Verein fuer Kernverfahrenstechnik und Analytik Rossendorf (VKTA), whose main activities cover basic research and tasks in the field of nuclear facilities decommissioning and radwaste management on site. (DG) [de

  7. Steam supply for the Principality of Liechtenstein. Process heat for industrial applications; Dampflieferung fuer das Fuerstentum Liechtenstein. Prozesswaerme fuer die Industrie

    Energy Technology Data Exchange (ETDEWEB)

    Dokter, Ernst [VfA Buchs fuer Kraft-Waerme-Kopplung und das Ferndampfsystem, Buchs (Switzerland)

    2009-07-15

    Switzerland is leading the world in thermal waste management. There are 29 incinerators (KVA - Kehrichtverbrennungsanlagen) with a capacity of 3.7 million t.p.a. They are operated by industrial or municipal owners and by the Verein fuer Abfallentsorgung Buchs SG. (orig.)

  8. 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.

  9. Tracer gas diffusion sampling test plan

    International Nuclear Information System (INIS)

    Rohay, V.J.

    1993-01-01

    Efforts are under way to employ active and passive vapor extraction to remove carbon tetrachloride from the soil in the 200 West Area an the Hanford Site as part of the 200 West Area Carbon Tetrachloride Expedited Response Action. In the active approach, a vacuum is applied to a well, which causes soil gas surrounding the well to be drawn up to the surface. The contaminated air is cleaned by passage through a granular activated carbon bed. There are questions concerning the radius of influence associated with application of the vacuum system and related uncertainties about the soil-gas diffusion rates with and without the vacuum system present. To address these questions, a series of tracer gas diffusion sampling tests is proposed in which an inert, nontoxic tracer gas, sulfur hexafluoride (SF 6 ), will be injected into a well, and the rates of SF 6 diffusion through the surrounding soil horizon will be measured by sampling in nearby wells. Tracer gas tests will be conducted at sites very near the active vacuum extraction system and also at sites beyond the radius of influence of the active vacuum system. In the passive vapor extraction approach, barometric pressure fluctuations cause soil gas to be drawn to the surface through the well. At the passive sites, the effects of barometric ''pumping'' due to changes in atmospheric pressure will be investigated. Application of tracer gas testing to both the active and passive vapor extraction methods is described in the wellfield enhancement work plan (Rohay and Cameron 1993)

  10. Use of labeled compounds in tracer experiments

    International Nuclear Information System (INIS)

    Anon.

    1991-01-01

    The use of radiotracers in research has become common. This chapter looks at some of the underlying assumptions and advantages of labeled compounds: advantages of radiotracers; availability of suitable tracers and labeled compounds; purity of labeled compounds; autoradiolysis; storage of labeled compounds; detection systems for chromatography and electrophoretic methods. 14 refs., 2 figs

  11. Rate tracer studies of heterogeneous catalysis

    Energy Technology Data Exchange (ETDEWEB)

    Happel, J; Kiang, S

    1977-10-01

    An analysis is presented of the extent to which parameters involved in transient tracing of isotopic species in heterogeneous catalysis can be determined by experiments in which tracer concentrations are measured as a function of time. Different treatments for open and closed systems with the over-all reaction at equilibrium or irreversible were developed.

  12. Tracer dispersion in planar multipole flows

    International Nuclear Information System (INIS)

    Koplik, J.; Redner, S.; Hinch, E.J.

    1994-01-01

    We study the motion of passive Brownian tracer particles in steady two-dimensional potential flows between sources and sinks. Our primary focus is understanding the long-time properties of the transit time probability distribution for the tracer to reach the sink p(t) and the influence of the flow geometry on this probability. A variety of illustrative case studies is considered. For radial potential flow in an annular region, competition between convection and diffusion leads to nonuniversal decay of the transit time probability. Dipolar and higher multipole flows are found to exhibit generic features, such as a power-law decay in p(t) with an exponent determined by the multipole moment, an exponential cutoff related to stagnation points, and a ''shoulder'' in p(t) that is related to reflection from the system boundaries. For spatially extended sinks, it is also shown that the spatial distribution of the collected tracer is independent of the overall magnitude of the flow field and that p(t) decays as a power law with a geometry-dependent exponent. Our results may offer the possibility of using tracer measurements to characterize the flow geometry of porous media

  13. 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.

  14. 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.

  15. Using radioactive tracer technique in municipal hygiene

    International Nuclear Information System (INIS)

    Yurasova, O.I.

    1974-01-01

    Work of the A. N. Syrsin Institute of General and Municiapl Hygiene using raidoactive tracers is reviewed. The studies include research on protein metabolism in the living organism following action of unfavorable factors of the environment; determination of the paths of introduction into the organism of substances with an alien composition; and study of the rate of resorption of subcutaneous papuli. Results are shown of radioactive-tracer studies on the mechanism of action of poisonous substances on the living organism and of migration of alien chemical compounds in the organism and in objects in the environment. It is concluded that the radioactive tracer method has wide application in municipal hygiene and sanitary microbiology. The absence of laborious operations, economy of time, precision of the experiments, and the possibility of obtaining additional information on the mechanism of action of poisonous substances on the organism and the low cost of such studies compared with other methods makes the radioactive tracer method economically attractive. The studies made show the various types of use of the method in municipal hygiene and sanitary microbiology

  16. Hybrid tracers for sentinel node biopsy

    International Nuclear Information System (INIS)

    Van Den Berg, N. S.; Kleinjan, G. I.; Valdés-Olmos, R. A.; Buckle, T.; Van Leeuwen, F. I.; Klop, W. M.; Horenblas, S.; Van Der Poel, H. G.

    2014-01-01

    Conventional sentinel node (SN) mapping is performed by injection of a radiocolloid followed by lymphoscintigraphy to identify the number and location of the primary tumor draining lymph node(s), the so-called SN(s). Over the last decade research has focused on the introduction of new imaging agents that can further aid (surgical) SN identification. Different tracers for SN mapping, with varying sizes and isotopes have been reported, most of which have proven their value in a clinical setting. A major challenge lies in transferring this diagnostic information obtained at the nuclear medicine department to the operating theatre thereby providing the surgeon with (image) guidance. Conventionally, an intraoperative injection of vital blue dye or a fluorescence dye is given to allow intraoperative optical SN identification. However, for some indications, the radiotracer-based approach remains crucial. More recently, hybrid tracers, that contain both a radioactive and fluorescent label, were introduced to allow for direct integration of pre- and intraoperative guidance technologies. Their potential is especially high when they are used in combination with new surgical imaging modalities and navigation tools. Next to a description of the known tracers for SN mapping, this review discusses the application of hybrid tracers during SN biopsy and how the introduction of these new techniques can further aid in translation of nuclear medicine information into the operating theatre.

  17. 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...

  18. 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.)

  19. Using radioactive tracer technique in municipal hygiene

    Energy Technology Data Exchange (ETDEWEB)

    Yurasova, O I [Institut Obshchej i Kommunal' noj Gigieny, Moscow (USSR)

    1974-01-01

    Work of the A. N. Syrsin Institute of General and Municiapl Hygiene using raidoactive tracers is reviewed. The studies include research on protein metabolism in the living organism following action of unfavorable factors of the environment; determination of the paths of introduction into the organism of substances with an alien composition; and study of the rate of resorption of subcutaneous papuli. Results are shown of radioactive-tracer studies on the mechanism of action of poisonous substances on the living organism and of migration of alien chemical compounds in the organism and in objects in the environment. It is concluded that the radioactive tracer method has wide application in municipal hygiene and sanitary microbiology. The absence of laborious operations, economy of time, precision of the experiments, and the possibility of obtaining additional information on the mechanism of action of poisonous substances on the organism and the low cost of such studies compared with other methods makes the radioactive tracer method economically attractive. The studies made show the various types of use of the method in municipal hygiene and sanitary microbiology.

  20. Pipeline leak detection using volatile tracers

    International Nuclear Information System (INIS)

    Thompson, G.M.; Golding, R.D.

    1993-01-01

    A method of leak detection for underground storage tanks and pipelines adds volatile tracers to the products in the tanks and analyzes the surrounding shallow soil gases for tracer vapors. This method has several advantages: the success of the test is not limited by the size and structural design of the vessels, tanks can be tested at any fill level without taking the tank out of service, the location of a leak along a pipeline is clearly marked by the location of the tracer, and liquid leaks as small as 0.2 liters per hour (lph) can be detected. A limitation is: the backfill material must have some degree of air permeability in the zone above the water table. Several field tests document the success achieved using this method. A tracer leak detection system was installed at Homestead AFB after several other testing methods failed to locate a leak at a valve pit location along approximately 4 kilometers of fuel transfer piping. The leak was detected to the side of the valve pit at a depth of approximately 2.5 meters below the ground surface. Another installation of Edwards AFB involved the collection of 415 soil gas samples along approximately 3,050 meters of 15.25-centimeter fiberglass pipeline. Fourteen separate leaks were detected

  1. 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

  2. Fibre-reinforced ceramics for vehicle brakes; Faserverstaerkte Keramiken fuer Bremsenanwendungen

    Energy Technology Data Exchange (ETDEWEB)

    Krenkel, W. [DLR Deutsches Zentrum fuer Luft- und Raumfahrt e.V., Stuttgart (Germany). Inst. fuer Bauweisen- und Konstruktionsforschung

    2000-08-01

    Fibre-reinforced ceramics are extremely light, with a high fracture toughness, and have a high potential for applications in motor brakes. It is envisaged that they will last through the whole vehicle life. They can be used in passenger cars, industrial vehicles, high-speed trains, aircraft and in safety brakes in machines, plants and haulage systems. [German] Im Rahmen der Raumfahrt-Forschung wurde vom Deutschen Zentrum fuer Luft- und Raumfahrt (DLR) das Fluessigsilicier-Verfahren zur Herstellung von keramischen Verbundwerkstoffen entwickelt. Diese extrem leichten und bruchzaehen Faserkeramiken haben sich unter den besonderen Bedingungen des Weltraums beispielsweise fuer Hitzeschutzstrukturen von Raumfahrzeugen hervorragend bewaehrt. Darueber hinaus zeigten Untersuchungen ein hohes Anwendungspotenzial fuer neue Bremsen mit deutlich verbesserten Reibungs- und Verschleisseigenschaften. Weiterentwicklungen des keramischen Gefueges fuehrten zu innovativen Leichtbau- bzw. Hochleistungs-Bremsen auf der Basis dieser harten und hitzebestaendigen Verbundwerkstoffe. Bereits mit serienmaessigen Bremsbelaegen wurden die heute geltenden Verschleiss- und Reibwertanforderungen teilweise weit uebertroffen. Die Leistungsfaehigkeit heutiger Bremssysteme kann damit deutlich gesteigert und die ungefederte Masse des Fahrwerks drastisch reduziert werden. Mit der zielgerichteten Anpassung geeigneter Belaege auf die neuen Keramik-Bremsscheiben scheint erstmals ein Einsatz von Lebensdauerbremsen moeglich zu sein, deren geringe Verschleissraten einen Austausch der Bremsscheiben waehrend der Betriebszeit eines Fahrzeugs ueberfluessig machen. Neben der Verwendung dieser innovativen Leichtbaubremsen im PKW-Bereich wird zukuenftig deren Einsatz auch fuer Gefahrguttransporter, Hochgeschwindigkeitszuege, Flugzeuge und fuer Sicherheitsbremsen im Maschinen- und Anlagenbau sowie in der Foerdertechnik erwartet. (orig.)

  3. Methods for conduct of atmospheric tracer studies at ANSTO

    Energy Technology Data Exchange (ETDEWEB)

    Clark, G H; Stone, D J.M.; Pascoe, J H [Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW (Australia). Environment Division

    2000-07-01

    A perfluorocarbon atmospheric tracer system has been developed to investigate atmospheric dispersion processes in the region surrounding the Lucas Heights Science and Technology Centre. This report discusses the tracer release, sampling and analysis methods.

  4. 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)

  5. Guidebook on radioisotope tracers in industry

    International Nuclear Information System (INIS)

    1990-01-01

    The idea of using tracers (chemical, dyes, etc.) in the investigation of complex physical phenomena has always attracted the attention of scientists and engineers. When radioactive isotopes became available it was immediately recognized that they offered an almost ideal solution to tracer selection. This book is devoted to reviewing the present status of the tracer method as such and to its applications to those branches of industry which have derived large benefits from the use of this modern technology. The main objectives of the IAEA's Industrial Applications and Chemistry Section is to help Member States in introducing to their own industries the different isotope and radiation techniques which have become available as a result of developments in the nuclear sciences. This section proposed the preparation of this guidebook, putting together various radiotracer methods and the experience obtained so far in their industrial use. Chapters 2 to 4 cover the general concept of tracers, technology and safety aspects, as well as data evaluation and interpretation. In chapter 5, therefore, general applications are discussed. In chapter 6, specialists in selected fields discuss their experience in radiotracer applications in various types of industrial activity. Most case studies are illustrated by at least one detailed example of an experiment carried out at an industrial installation. Current trends in the development of radiotracer methods are discussed in chapter 7, from both a theoretical and a practical viewpoint. Some possible new RTT applications in the future are also discussed here. Sealed radioactive sources are used almost as often as radioisotope tracers in industrial measurements. Annex I gives a short review of these techniques. Readers who are interested in the basic principles of radioisotope production will find the necessary information in Annex II. Annexes III, V and VI provide a demonstration of fundamental relations and properties; useful

  6. New radioactive tracers can help find cause of jaundice

    International Nuclear Information System (INIS)

    Carrard, G.

    1987-01-01

    Radioactive tracers for the investigation of a condition known as persistent jaundice of the newborn, have been designed, prepared and tested at ANSTO. The tracers are chemical compounds of the radioactive elements gallium-67 and indium-111. They given lower radiation doses than the conventional radioactive tracer, iodine-131, used in these studies

  7. 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....

  8. Industrial tracer application in people's republic of china

    International Nuclear Information System (INIS)

    Sun Maoyi

    1987-01-01

    A number of important applications of radioisotopes and their compounds used as tracers in petroleum industry, metallurgical industry, mechanical industry, chemical industry, electronic industry, hydrology and water conservancy in China are introduced in this paper. And the tracer technique applied to entomology is also mentioned. The industrial tracer applications are successful and beneficial in People's Republic of China from the examples given. (author)

  9. Natural tracer profiles across argillaceous formations

    International Nuclear Information System (INIS)

    Mazurek, Martin; Alt-Epping, Peter; Bath, Adrian; Gimmi, Thomas; Niklaus Waber, H.; Buschaert, Stephane; Canniere, Pierre De; Craen, Mieke De; Gautschi, Andreas; Savoye, Sebastien; Vinsot, Agnes; Wemaere, Isabelle; Wouters, Laurent

    2011-01-01

    Highlights: → Solute transport processes in clay and shale formations at nine sites are examined. → Conservative pore-water tracers (e.g. Cl - , δ 18 O, δ 2 H, He) show regular profiles. → These indicate the dominance of diffusive transport over times of 10 5 -10 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 - , Br - ), water isotopes (δ 18 O, δ 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 entire data set. In essentially all cases, the

  10. Fibre-reinforced ceramics for vehicle brakes; Faserverstaerkte Keramiken fuer Bremsenanwendungen

    Energy Technology Data Exchange (ETDEWEB)

    Krenkel, W. [DLR Deutsches Zentrum fuer Luft- und Raumfahrt e.V., Stuttgart (Germany). Inst. fuer Bauweisen- und Konstruktionsforschung

    2000-07-01

    In the context of their aerospace research activities, DLR (Deutsches Zentrum fuer Luft- und Raumfahrt) developed a new process for producing ceramic fibre composite materials that are extremely light and tough. Apart from their applications in aerospace engineering, they have great potential for motor brakes with improved friction and wear characteristics. Excellent results were achieved with the new materials even with conventional brake liners. With customised liners, brake life may be prolonged to match the car life. Further applications are expected in trucks for transport in hazardous materials, high-speed trains, aircraft, industrial machinery and plants, and conveyor systems. [German] Im Rahmen der Raumfahrt-Forschung wurde vom Deutschen Zentrum fuer Luft- und Raumfahrt (DLR) das Fluessigsilicier-Verfahren zur Herstellung von keramischen Verbundwerkstoffen entwickelt. Diese extrem leichten und bruchzaehen Faserkeramiken haben sich unter den besonderen Bedingungen des Weltraums beispielsweise fuer Hitzeschutzstrukturen von Raumfahrzeugen hervorragend bewaehrt. Darueber hinaus zeigten Untersuchungen ein hohes Anwendungspotenzial fuer neue Bremsen mit deutlich verbesserten Reibungs- und Verschleisseigenschaften. Weiterentwicklungen des keramischen Gefueges fuehrten zu innovativen Leichtbau- bzw. Hochleistungs-Bremsen auf der Basis dieser harten und hitzebestaendigen Verbundwerkstoffe. Bereits mit serienmaessigen Bremsbelaegen wurden die heute geltenden Verschleiss- und Reibwertanforderungen teilweise weit uebertroffen. Die Leistungsfaehigkeit heutiger Bremssysteme kann damit deutlich gesteigert und die ungefederte Masse des Fahrwerks drastisch reduziert werden. Mit der zielgerichteten Anpassung geeigneter Belaege auf die neuen Keramik-Bremsscheiben scheint erstmals ein Einsatz von Lebensdauerbremsen moeglich zu sein, deren geringe Verschleissraten einen Austausch der Bremsscheiben waehrend der Betriebszeit eines Fahrzeugs ueberfluessig machen. Neben der

  11. 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

  12. Advertising campaign for natural gas vehicles is getting along; Werbung fuer Erdgasfahrzeuge kommt ins Rollen

    Energy Technology Data Exchange (ETDEWEB)

    Koerner, I. [me-gas, Projektgruppe Erdgasfahrzeuge, Berlin (Germany)

    2002-10-01

    Six students of the Berlin University of Arts developed a nationwide communication campaign for natural gas vehicles. The campaign is the first of its kind which is not restricted to industrial and commercial users. Apart from the innovative and unusual creations, it was the results of market research that created a sensation. [German] Sechs Studenten der Berliner Universitaet der Kuenste haben eine bundesweite Kommunikationskampagne fuer Erdgasfahrzeuge erarbeitet, die zum ersten Mal nicht nur die gewerblichen Vielfahrer ansprechen soll. Neben den ungewoehnlichen und zum Teil gewagten Kreationen waren es die Ergebnisse aus der Marktforschung, die fuer Ueberraschungen sorgten. (orig.)

  13. Part-turn gearboxes for electric actuators; Schwenkgetriebe fuer elektrische Stellantriebe

    Energy Technology Data Exchange (ETDEWEB)

    Herbstritt, M. [Riester (W.) GmbH und Co. KG, Muellheim (Germany)

    2002-09-01

    Different types of gearboxes provide a useful complement to the electric actuator type ranges. The gearboxes can be combined with the actuators in many ways. Multi-turn actuators, for example, can be turned into part-turn actuators. When using a modular system, a suitable solution for almost any automation task in the field of industrial valves can be found. (orig.) [German] Sinnvoll ergaenzt werden elektrische Stellantriebe fuer Armaturen durch verschiedene Arten von Getrieben. Die Getriebe sind in vielfaeltiger Weise mit den Stellantrieben kombinierbar. So werden beispielsweise aus Drehantrieben Schwenkantriebe. Mit einem Baukasten-System laesst sich so fuer nahezu jede Automatisierungsaufgabe im Bereich der Industriearmaturen eine passende Loesung finden. (orig.)

  14. 15N tracer techniques in pediatric research

    International Nuclear Information System (INIS)

    Heine, W.; Richter, I.; Plath, C.; Wutzke, K.; Stolpe, H.J.; Tiess, M.; Toewe, J.

    1983-01-01

    The main topics of the review comprise mathematical fundamentals of the determination of N metabolism parameters using the 3-pool method, the value of different 15 N tracer substances for the determination of whole-body protein parameters, the utilization of parenterally applied D-amino acids, studies on the influence of different diets on the N metabolism of premature infants with the 15 N tracer technique, the application of the 15 N-glycine-STH-test for the evaluation of the therapeutic effect of STH in children suffering from hypothalamico-hypophyseal dwarfism, in vivo studies on urea utilization by the infant intestinal flora under various dietary regimens as well as in vitro investigations on the utilization of 15 N-labelled urea and NH 4 Cl, resp., by the intestinal flora

  15. Product marketing for eco-power; Produktemarketing fuer Oekostrom

    Energy Technology Data Exchange (ETDEWEB)

    Huber, D. [Verband Schweizerischer Elektrizitaetswerke, Zuerich (Switzerland)

    1998-10-30

    The company NaturEnergie (natural energy), a subsidiary of the Energieversorger Kraftwerk Laufenburg AG (KWL) is located in Grenzach-Whylen (Germany) near Basel (Switzerland) has been selling power generated from sun and water since the 1st of October 1998. The company employes a cleverly designed, emotional marketing strategy in order to position the brand ``NaturEnergie`` as a label for ``green power`` on the market. Bulletin VSE talked to Dr. Kai-Hendrik Schlusche (40), co-founder and member of the board of NaturEnergie AG about marketing and pricing of ``green`` power and about relations with Switzerland.(orig.) [Deutsch] Im grenznahen Grenzach-Whylen bei Basel verkauft die Firma NaturEnergie, eine Tochtergesellschaft der Energieversorger Kraftwerk Laufenburg AG (KWL) und Kraftuebertragungswerke Rheinfelden AG (KWR), seit 1. Oktober 1998 Oekostrom aus Sonne und Wasser. Mit Hilfe einer ausgekluegelten emotionellen Marketingstrategie will das junge Unternehmen die Marke `NaturEnergie` als Label fuer `gruenen Strom` im Markt positionieren. Bulletin VSE sprach mit Dr. Kai-Hendrik Schlusche (40), seit Mai 1998 Gruendungsvorstand der NaturEnergie AG, ueber Marketing, Preisgestaltung von `gruenem Strom` und die Beziehungen zur Schweiz. (orig.)

  16. 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.)

  17. Radioactive tracers and the cracking modelings

    International Nuclear Information System (INIS)

    Bettens, B.

    1982-01-01

    The use of tracers (3H and 14 C) labelled in specific positions is an intensive contribution to the understanding and the revealing of the very often complex cracking modeling. The pyrolytic decay of the phenol and the cresols, of the aniline, of the phenantrene and its hydrogenated derived products were investigated and are presented as examples. The decay mechanisms give a theoretical knowledge of the thermal cracking and allow to handle the results on an industrial scale. (AF)

  18. 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.

  19. 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...

  20. Radon diagnostics and tracer gas measurements

    International Nuclear Information System (INIS)

    Jilek, K.; Brabec, M.

    2004-01-01

    An outline is presented of the tracer gas technique, which is used for continuous measurements of air ventilation rate (generally time-varying) and for simultaneous estimation of air ventilation rate and radon entry rate, and some of its limitations are discussed. The performance of this technique in the calculation of the air ventilation rate is demonstrated on real data from routine measurements. The potential for air ventilation rate estimation based on radon measurements only is discussed. A practical application is described of the tracer gas technique to a simultaneous estimation of the air ventilation rate and radon entry rate in a real house where the effectiveness of radon remedy was tested. The following main advantages of the CO tracer gas techniques are stressed: (i) The averaging method continuous determination of the ventilation rate with good accuracy (≤ 20 %). (ii) The newly presented and verified method based on simultaneous measurements of radon concentration and CO gas concentration enables separate continuous measurements of the radon entry rate and ventilation rate. The results of comparative measurements performed with the aim to estimate the inaccuracy in determination of radon entry rate showed acceptable and good agreement up to approximately 10 %. The results of comparative measurements performed with the aim to estimate the mutual commensuration of the method to the determination of the ventilation rate confirmed the expected unreliability the two parametric non-linear regression method, which is the most frequently used method in radon diagnostic in the Czech Republic

  1. The ATLAS DDM Tracer monitoring framework

    International Nuclear Information System (INIS)

    Zang Dongsong; Garonne, Vincent; Barisits, Martin; Lassnig, Mario; Andrew Stewart, Graeme; Molfetas, Angelos; Beermann, Thomas

    2012-01-01

    The DDM Tracer monitoring framework is aimed to trace and monitor the ATLAS file operations on the Worldwide LHC Computing Grid. The volume of traces has increased significantly since the framework was put in production in 2009. Now there are about 5 million trace messages every day and peaks can be near 250Hz, with peak rates continuing to climb, which gives the current structure a big challenge. Analysis of large datasets based on on-demand queries to the relational database management system (RDBMS), i.e. Oracle, can be problematic, and have a significant effect on the database's performance. Consequently, We have investigated some new high availability technologies like messaging infrastructure, specifically ActiveMQ, and key-value stores. The advantages of key value store technology are that they are distributed and have high scalability; also their write performances are usually much better than RDBMS, all of which are very useful for the Tracer monitoring framework. Indexes and distributed counters have been also tested to improve query performance and provided almost real time results. In this paper, the design principles, architecture and main characteristics of Tracer monitoring framework will be described and examples of its usage will be presented.

  2. Novel tracer for radiation treatment planning

    International Nuclear Information System (INIS)

    Schwarzenboeck, S.; Krause, B.J.; Herrmann, K.; Gaertner, F.; Souvatzoglou, M.; Klaesner, B.

    2011-01-01

    PET and PET/CT with innovative tracers gain increasing importance in diagnosis and therapy management, and radiation treatment planning in radio-oncology besides the widely established FDG. The introduction of [ 18 F]Fluorothymidine ([ 18 F]FLT) as marker of proliferation, [ 18 F]Fluoromisonidazole ([ 18 F]FMISO) and [ 18 F]Fluoroazomycin-Arabinoside ([ 18 F]FAZA) as tracer of hypoxia, [ 18 F]Fluoroethyltyrosine ([ 18 F]FET) and [ 11 C]Methionine for brain tumour imaging, [ 68 Ga]DOTATOC for somatostatin receptor imaging, [ 18 F]FDOPA for dopamine synthesis and radioactively labeled choline derivatives for imaging phospholipid metabolism have opened novel approaches to tumour imaging. Some of these tracers have already been implemented into radio-oncology: Amino acid PET and PET/CT have the potential to optimise radiation treatment planning of brain tumours through accurate delineation of tumour tissue from normal tissue, necrosis and edema. Hypoxia represents a major therapeutic problem in radiation therapy. Hypoxia imaging is very attractive as it may allow to increase the dose in hypoxic tumours potentially allowing for a better tumour control. Advances in hybrid imaging, i.e. the introduction of MR/PET, may also have an impact in radio-oncology through synergies related to the combination of molecular signals of PET and a high soft tissue contrast of MRI as well as functional MRI capabilities. (orig.)

  3. Commercial applications of perfluorocarbon tracer (PFT) technology

    International Nuclear Information System (INIS)

    Dietz, R.N.

    1991-06-01

    Tracer technology can be successfully applied to many leak-checking and monitoring evaluations of operating systems (e.g., building HVACs), manufacturing processes and products (e.g., air conditioners), and subsurface components and systems (e.g., underground storage tanks). Perfluorocarbon tracer (PFT) technology is the most sensitive of all tracer technologies because the ambient background levels of the five (5) routinely-used PFTs are in the range of parts per 10 15 parts of air (i.e., parts per quadrillion-ppq) and this technology's instrumentation can measure down to those levels. The effectiveness of this technology is achieved both in terms of cost (very little PFT need to be used) and detectability; for example, very small leaks can be rapidly detected. The PFT compounds, which are environmentally and biologically safe to use, are commercially available as are the sampling and analysis instrumentation. This presentation concerns (1) the steps being taken to commercialize this technology, (2) new applications of processes currently under study, and (3) applications in areas of use that will be particularly beneficial to the environment. 21 refs., 2 figs., 2 tabs

  4. Bundesamt fuer Strahlenschutz (BfS). Annual report 2011; Bundesamt fuer Strahlenschutz (BfS). Jahresbericht 2011

    Energy Technology Data Exchange (ETDEWEB)

    Ebermann, Lutz (comp.)

    2012-07-01

    The annual report 2011 of the Bundesamt fuer Strahlenschutz (BfS) includes the following main articles: Fukushima and the consequences, new power lines across Germany and the management of radioactive wastes in Germany. Further topics of the BfS were reasonable exposure to sun and skin cancer prevention, individual health assessment of lung cancer with low-dose CT, occupational radiation exposure in medicine, radiation protection at setting up digital radio of security authorities and organizations, importance of laboratory ring experiments for incorporation monitoring, defence against nuclear hazards: cooperation and exercises in 2011, new developments with regard to radioactivity in drinking water, reportable events in nuclear facilities in 2011, decommissioning of a permanently shut down NPP. The environmental research program of the Federal Environmental ministry - research for strengthening nuclear safety and radiation protection: German uranium miners biobank: consequences of uranium mining and radiological impacts, German miners cohort study, health effects of strong magnetic fields of NMR imaging, radiation exposure due to nuclear medical examinations, national survey on the radio-cesium contamination of wild boars.

  5. Emission quantification using the tracer gas dispersion method: The influence of instrument, tracer gas species and source simulation

    DEFF Research Database (Denmark)

    Delre, Antonio; Mønster, Jacob; Samuelsson, Jerker

    2018-01-01

    The tracer gas dispersion method (TDM) is a remote sensing method used for quantifying fugitive emissions by relying on the controlled release of a tracer gas at the source, combined with concentration measurements of the tracer and target gas plumes. The TDM was tested at a wastewater treatment...... plant for plant-integrated methane emission quantification, using four analytical instruments simultaneously and four different tracer gases. Measurements performed using a combination of an analytical instrument and a tracer gas, with a high ratio between the tracer gas release rate and instrument...... precision (a high release-precision ratio), resulted in well-defined plumes with a high signal-to-noise ratio and a high methane-to-tracer gas correlation factor. Measured methane emission rates differed by up to 18% from the mean value when measurements were performed using seven different instrument...

  6. 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.

  7. Good organization is essential for success. Pt. 1. Energy management for commercial buildings.; Eine gute Organisation ist Voraussetzung fuer den Erfolg. T. 1. Energiemanagement fuer die Gebaeudetechnik.

    Energy Technology Data Exchange (ETDEWEB)

    Rader, Michael [CentraLine c/o Honeywell, Schoenaich (Germany)

    2013-07-15

    Energy costs caused by heating, ventilation, air-conditioning and lighting systems, represent a significant portion of the total operating costs of a building. continuously rising prices of gas, oil and electricity increase the cost pressure on the building operators and users: energy efficiency is becoming a major factor for the competitiveness of a company. In the manufacturing sector, trade and hotel the energy costs have a direct impact on the company's margins. Thus, the willingness to invest in energy saving measures increased. [German] Energiekosten, verursacht durch Heizungs-, Lueftungs-, Klima- und Beleuchtungsanlagen, stellen einen signifikanten Anteil der Gesamtbetriebskosten eines Gebaeudes dar. Kontinuierlich steigende Preise fuer Gas, Oel und Elektrizitaet erhoehen den Kostendruck auf die Gebaeudebetreiber und -nutzer: Energieeffizienz wird zu einem bestimmenden Faktor fuer die Wettbewerbsfaehigkeit eines Unternehmens. Im produzierenden Gewerbe, im Handel und im Hotelgewerbe haben Energiekosten einen direkten Einfluss auf die Margen des Unternehmens. Dadurch erhoeht sich die Bereitschaft, in Energiesparmassnahmen zu investieren.

  8. Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS). Annual report 2010/2011; Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS). Jahresbericht 2010/2011

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2011-07-01

    The annual report 2010/11 of the Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS) covers the following topics: organization, corporate development and public relations; reactor accident in Fukushima; Projects and work priorities (reactor safety; waste management; radiation and environmental protection; international projects); project management and project support; equity participations and subsidiaries (RISKAUDIT IRSN/GRS International; institute for safety technologies (ISTec), European Nuclear Safety Training and Tutoring Institute (ENSTTI)).

  9. 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.

  10. 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.)

  11. Environmental criteria for building site selection; Umweltkriterien bei der Standortsuche fuer Bauvorhaben

    Energy Technology Data Exchange (ETDEWEB)

    Locher, B [Umweltbundesamt, Berlin (Germany)

    1995-09-01

    The author of the present paper provides information on the application of ecological standards as part of the regulation of development planning. (HW) [Deutsch] Die Autorin gibt in ihrem Vortrag Hinweise auf die Anwendung von oekologischen Standards als Regelungsbestandteile fuer die Bauleitplanung. (HW)

  12. Utilizing offshore potentials for wind power generation; Nutzung der Offshore-Potentiale fuer die Windenergie

    Energy Technology Data Exchange (ETDEWEB)

    Hannemann, H. [Neptun Industrie GmbH, Rostock (Germany)

    2000-07-01

    The contribution discusses the importance of the offshore market and recommends measures to develop it. A turnkey offer is required for exports, which means that all organisations cooperating in the pilot project must prove their competence. The status of a pilot project in the Baltic Sea and the further plans for the park (20 systems, 40 MW, more than 10 km off the coast, water depth about 20 m) are reviewed. [German] Zur Erschliessung des Offshore - Marktes fuer Windenergieanlagen ist es erforderlich, die Technologie ''vor der eigenen Haustuer'' demonstrieren zu koennen. Nach einer Betrachtung der europaeischen Offshore - Windenergie - Potentiale und der davon moeglicherweise nutzbaren Anteile wird die Bedeutung des Offshore - Marktes deutlich. Besonders fuer die Hersteller ist der Offshore - Markt fuer den langfristigen Export von besonderer Bedeutung. Um den Export zu realisieren, ist ein Turnkey - Angebot erforderlich, so dass im Pilotprojekt alle an der gesamten Realisation beteiligten Organisationen ihre Kompetenz beweisen muessen und koennen. Der Stand eines Pilotprojektes in der Ostsee und die weitere Planung fuer den Park (20 Anlagen, 40 MW, >10 km Kuestenentfernung, ca. 20 m Wassertiefe) wird dargestellt. (orig.)

  13. Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS). Annual report 2013/14

    International Nuclear Information System (INIS)

    2016-02-01

    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.

  14. 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.)

  15. 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.

  16. 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.

  17. PIV tracer behavior on propagating shock fronts

    International Nuclear Information System (INIS)

    Glazyrin, Fyodor N; Mursenkova, Irina V; Znamenskaya, Irina A

    2016-01-01

    The present work was aimed at the quantitative particle image velocimetry (PIV) measurement of a velocity field near the front of a propagating shock wave and the study of the dynamics of liquid tracers crossing the shock front. For this goal, a shock tube with a rectangular cross-section (48  ×  24 mm) was used. The flat shock wave with Mach numbers M  =  1.4–2.0 propagating inside the tube channel was studied as well as an expanding shock wave propagating outside the channel with M  =  1.2–1.8 at its main axis. The PIV imaging of the shock fronts was carried out with an aerosol of dioctyl sebacate (DEHS) as tracer particles. The pressures of the gas in front of the shock waves studied ranged from 0.013 Mpa to 0.1 MPa in the series of experiments. The processed PIV data, compared to the 1D normal shock theory, yielded consistent values of wake velocity immediately behind the plain shock wave. Special attention was paid to the blurring of the velocity jump on the shock front due to the inertial particle lag and peculiarities of the PIV technique. A numerical algorithm was developed for analysis and correction of the PIV data on the shock fronts, based on equations of particle-flow interaction. By application of this algorithm, the effective particle diameter of the DEHS aerosol tracers was estimated as 1.03  ±  0.12 μm. A number of different formulations for particle drag were tested with this algorithm, with varying success. The results show consistency with previously reported experimental data obtained for cases of stationary shock waves. (paper)

  18. Survey on industrial applications of radioactive tracers

    International Nuclear Information System (INIS)

    Kim, Jae Rok; Yoo, Young Soo; Lee, Jong Doo; Awh, Ok Doo; Kim, Jun Hyung

    1986-12-01

    Current status and future feasibilities of industrial tracer applications in the Republic of Korea have been surveyed. Microleak detection using Krypton-85 in eight electronics industrial companies, and efficiency tests of steam generators in four nuclear power plants using Sodium-24 are the principal applications in Korea. Future applications are expected for mercury inventory in one soda industrial company, and alkali movement studies in two cement industrial companies. Korean industries expressed deep interest in leak detection in underground pipelines, abrasion/corrosion studies, mixing rate and residence time measurements. (Author)

  19. Pharmaceuticals as Groundwater Tracers - Applications and Limitations

    Science.gov (United States)

    Scheytt, T. J.; Mersmann, P.; Heberer, T.

    2003-12-01

    Pharmaceutically active substances and metabolites are found at concentrations up to the microgram/L-level in groundwater samples from the Berlin (Germany) area and from several other places world wide. Among the compounds detected in groundwater are clofibric acid, propyphenazone, diclofenac, ibuprofen, and carbamazepine. Clofibric acid, the active metabolite of clofibrate and etofibrate (blood lipid regulators) is detected in groundwater at maximum concentrations of 7300 ng/L. Among the most important input paths of drugs are excretion and disposal into the sewage system. Groundwater contamination is likely to be due to leaky sewage systems, influent streams, bank filtration, and irrigation with effluent water from sewage treatment plants. There are no known natural sources of the above mentioned pharmaceuticals. The use of pharmaceuticals as tracers may include: (a) Quantification of infiltration from underground septic tanks (b) Detection of leaky sewage systems / leaky sewage pipes (c) Estimation of the effectiveness of sewage treatment plants (d) Identification of transport pathways of other organic compounds (e) Quantification of surface water / groundwater interaction (f) Characterization of the biodegradation potential. The use of pharmaceuticals as tracers is limited by variations in input. These variations depend on the amount of drugs prescribed and used in the study area, the social structure of the community, the amount of hospital discharge, and temporal concentration variations. Furthermore, the analysis of trace amounts of pharmaceuticals is sophisticated and expensive and may therefore limit the applicability of pharmaceuticals as tracers. Finally, the transport and degradation behavior of pharmaceuticals is not fully understood. Preliminary experiments in the laboratory were conducted using sediment material and groundwater from the Berlin area to evaluate the transport and sorption behavior of selected drugs. Results of the column experiments

  20. Tracer preparate and method for its production

    International Nuclear Information System (INIS)

    Pratt, F.P.; Gagnon, D.

    1978-01-01

    The injectable tracer preparate for investigations to determine the blood flow in organs or the effect of drugs on the blood flow consists of a core of ion exchanger resin coated with polyfuran or a polymer which is the reaction product of a monomer catalysable by acid or base. The nuclei have a diameter of 10 to 200 micron, the coating thickness is between 1 and 3 micron. Ions of Ce 141, Cr 51, Sr 85, Sr 46 or Co 57 of strength 0.1-100 millicurie are adsorbed on the nucleus. (DG) [de

  1. Tracer techniques in estimating nuclear materials holdup

    International Nuclear Information System (INIS)

    Pillay, K.K.S.

    1987-01-01

    Residual inventory of nuclear materials remaining in processing facilities (holdup) is recognized as an insidious problem for safety of plant operations and safeguarding of special nuclear materials (SNM). This paper reports on an experimental study where a well-known method of radioanalytical chemistry, namely tracer technique, was successfully used to improve nondestructive measurements of holdup of nuclear materials in a variety of plant equipment. Such controlled measurements can improve the sensitivity of measurements of residual inventories of nuclear materials in process equipment by several orders of magnitude and the good quality data obtained lend themselves to developing mathematical models of holdup of SNM during stable plant operations

  2. 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.

  3. Measurements of waste tank passive ventilation rates using tracer gases

    International Nuclear Information System (INIS)

    Huckaby, J.L.; Olsen, K.B.; Sklarew, D.S.; Evans, J.C.; Remund, K.M.

    1997-09-01

    This report presents the results of ventilation rate studies of eight passively ventilated high-level radioactive waste tanks using tracer gases. Head space ventilation rates were determined for Tanks A-101, AX-102, AX-103, BY-105, C-107, S-102, U-103, and U-105 using sulfur hexafluoride (SF 6 ) and/or helium (He) as tracer gases. Passive ventilation rates are needed for the resolution of several key safety issues. These safety issues are associated with the rates of flammable gas production and ventilation, the rates at which organic salt-nitrate salt mixtures dry out, and the estimation of organic solvent waste surface areas. This tracer gas study involves injecting a tracer gas into the tank headspace and measuring its concentration at different times to establish the rate at which the tracer is removed by ventilation. Tracer gas injection and sample collection were performed by SGN Eurisys Service Corporation and/or Lockheed Martin Hanford Corporation, Characterization Project Operations. Headspace samples were analyzed for He and SF 6 by Pacific Northwest National Laboratory (PNNL). The tracer gas method was first demonstrated on Tank S-102. Tests were conducted on Tank S-102 to verify that the tracer gas was uniformly distributed throughout the tank headspace before baseline samples were collected, and that mixing was sufficiently vigorous to maintain an approximately uniform distribution of tracer gas in the headspace during the course of the study. Headspace samples, collected from a location about 4 in away from the injection point and 15, 30, and 60 minutes after the injection of He and SF 6 , indicated that both tracer gases were rapidly mixed. The samples were found to have the same concentration of tracer gases after 1 hour as after 24 hours, suggesting that mixing of the tracer gas was essentially complete within 1 hour

  4. Chemotherapeutic agent and tracer composition and use thereof

    International Nuclear Information System (INIS)

    Babb, A. L.

    1985-01-01

    A therapeutic composition suitable for extracorporeal treatment of whole blood comprises a dialyzable chemotherapeutic agent and a dialyzable fluorescable tracer means. The removal rate of the fluorescable tracer compound from treated blood during hemodialysis is a function of the removal rate of unreacted chemotherapeutic agent present. The residual chemotherapeutic agent concentration after hemodialysis is ascertained by measuring the concentration of the fluorescable tracer compound in a dialysate using fluorometric techniques

  5. Atmospheric Gas Tracers in Groundwater: Theory, Sampling. Measurement and Interpretation

    International Nuclear Information System (INIS)

    Bayari, C.S.

    2002-01-01

    Some of the atmospheric gasses posses features that are sought in an environmental tracer of hydrogeologic interest. Among these, chlorofluorocarbons, sulfur hegzafluoride, carbon tetrachloride, methyl chloroform, krypton-85 etc. have found increasing use in groundwater age dating studies during the last ten years. This paper explains the theory of their use as tracer and discusses the major concerns as related to their sampling and analyses. Factors affecting their applicability and the approach to interpret tracer gas data is briefly outlined

  6. 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

  7. Feasibility study for new ecolabels for the product group: Wood pellet firings. Final report; Machbarkeitsstudie fuer neue Umweltzeichen fuer die Produktgruppe: Holzpelletfeuerungen. Endbericht

    Energy Technology Data Exchange (ETDEWEB)

    Hoffmann, E.; Weiss, J.; Hirschl, B.

    2002-07-01

    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

  8. 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

  9. Tracer Testing for Estimating Heat Transfer Area in Fractured Reservoirs

    Energy Technology Data Exchange (ETDEWEB)

    Pruess, Karsten; van Heel, Ton; Shan, Chao

    2004-05-12

    A key parameter governing the performance and life-time of a Hot Fractured Rock (HFR) reservoir is the effective heat transfer area between the fracture network and the matrix rock. We report on numerical modeling studies into the feasibility of using tracer tests for estimating heat transfer area. More specifically, we discuss simulation results of a new HFR characterization method which uses surface-sorbing tracers for which the adsorbed tracer mass is proportional to the fracture surface area per unit volume. Sorption in the rock matrix is treated with the conventional formulation in which tracer adsorption is volume-based. A slug of solute tracer migrating along a fracture is subject to diffusion across the fracture walls into the adjacent rock matrix. Such diffusion removes some of the tracer from the fluid in the fractures, reducing and retarding the peak in the breakthrough curve (BTC) of the tracer. After the slug has passed the concentration gradient reverses, causing back-diffusion from the rock matrix into the fracture, and giving rise to a long tail in the BTC of the solute. These effects become stronger for larger fracture-matrix interface area, potentially providing a means for estimating this area. Previous field tests and modeling studies have demonstrated characteristic tailing in BTCs for volatile tracers in vapor-dominated reservoirs. Simulated BTCs for solute tracers in single-phase liquid systems show much weaker tails, as would be expected because diffusivities are much smaller in the aqueous than in the gas phase, by a factor of order 1000. A much stronger signal of fracture-matrix interaction can be obtained when sorbing tracers are used. We have performed simulation studies of surface-sorbing tracers by implementing a model in which the adsorbed tracer mass is assumed proportional to the fracture-matrix surface area per unit volume. The results show that sorbing tracers generate stronger tails in BTCs, corresponding to an effective

  10. 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

  11. The ATLAS DDM Tracer monitoring framework

    CERN Document Server

    ZANG, D; The ATLAS collaboration; BARISITS, M; LASSNIG, M; Andrew STEWART, G; MOLFETAS, A; BEERMANN, T

    2012-01-01

    The DDM Tracer Service is aimed to trace and monitor the atlas file operations on the Worldwide LHC Computing Grid. The volume of traces has increased significantly since the service started in 2009. Now there are about ~5 million trace messages every day and peaks of greater than 250Hz, with peak rates continuing to climb, which gives the current service structure a big challenge. Analysis of large datasets based on on-demand queries to the relational database management system (RDBMS), i.e. Oracle, can be problematic, and have a significant effect on the database's performance. Consequently, We have investigated some new high availability technologies like messaging infrastructure, specifically ActiveMQ, and key-value stores. The advantages of key value store technology are that they are distributed and have high scalability; also their write performances are usually much better than RDBMS, all of which are very useful for the Tracer service. Indexes and distributed counters have been also tested to improve...

  12. Advection and dispersion of bed load tracers

    Science.gov (United States)

    Lajeunesse, Eric; Devauchelle, Olivier; James, François

    2018-05-01

    We use the erosion-deposition model introduced by Charru et al. (2004) to numerically simulate the evolution of a plume of bed load tracers entrained by a steady flow. In this model, the propagation of the plume results from the stochastic exchange of particles between the bed and the bed load layer. We find a transition between two asymptotic regimes. The tracers, initially at rest, are gradually set into motion by the flow. During this entrainment regime, the plume is strongly skewed in the direction of propagation and continuously accelerates while spreading nonlinearly. With time, the skewness of the plume eventually reaches a maximum value before decreasing. This marks the transition to an advection-diffusion regime in which the plume becomes increasingly symmetrical, spreads linearly, and advances at constant velocity. We analytically derive the expressions of the position, the variance, and the skewness of the plume and investigate their asymptotic regimes. Our model assumes steady state. In the field, however, bed load transport is intermittent. We show that the asymptotic regimes become insensitive to this intermittency when expressed in terms of the distance traveled by the plume. If this finding applies to the field, it might provide an estimate for the average bed load transport rate.

  13. The use potential of aquifer thermal energy storage systems in Canada; Das Anwendungspotential fuer Aquiferwaermespeichersysteme in Kanada

    Energy Technology Data Exchange (ETDEWEB)

    Cruickshanks, F. [Environment Canada, Dartmouth, ON (Canada); Morofski, E. [Government Services Canada, Ottawa, ON (Canada). Technology RD and D

    1994-12-31

    This paper offers a brief overview of the historical and technical aspects of aquifer thermal energy storage and its use potential in commercial buildings in Canada. Aquifer thermal energy storage systems are now attractive both for new commercial buildings in Canada and for some already existing ones. This holds true especially of the Atlantic region, where fuel costs are rising and electric power rates vary according to the time of day. The simple pay-back period for ATES systems is between zero and five years. The economic aspects of the use of ATES systems in buildings are pointed out. (orig./BWI) [Deutsch] Dieser Beitrag gibt eine kurze Uebersicht der historischen und technischen Aspekte der Waermespeicherung in Aquiferen und deren Verwendungspotential in kommerziellen Gebaeuden in Kanada. Aquiferwaermespeicherungssysteme sind nunmehr attraktiv sowohl fuer neue als auch fuer manche bereits bestehenden kommerziellen Gebaeude in Kanada. Dies gilt insbesondere fuer die atlantische Region wegen der dort steigenden Kosten fuer Brennstoffe und tageszeitabhaengigen fuer elektrischen Strom. Die einfache Amortisationszeit fuer ATES-Systeme liegt zwischen null und fuenf Jahren. Die wirtschaftlichen Gesichtspunkte des Einsatzes von ATES-Systemen in kommerziellen Gebaeuden werden angefuehrt. (orig./BWI)

  14. 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.

  15. A DICOM based PACS for nuclear medicine; Ein DICOM-basiertes PACS fuer die Nuklearmedizin

    Energy Technology Data Exchange (ETDEWEB)

    Lassmann, M.; Reiners, C. [Wuerzburg Univ. (Germany). Klinik und Poliklinik fuer Nuklearmedizin

    2002-02-01

    The installation of a radiology information system (RIS) connected to a hospital information system (HIS) and a picture archiving and communications system (PACS) seems mandatory for a nuclear medicine department in order to guarantee a high patient throughput. With these systems a fast transmission of reports, images to the in- and out-patients' wards and private practitioners is realized. Therefore, since April 2000, at the department of nuclear medicine of the university of Wuerzburg a completely DICOM based PACS has been implemented in addition to the RIS. With this system a DICOM based workflow is realized throughout the department of nuclear medicine for reporting and archiving. The PACS is connected to six gamma-cameras, a PET scanner, a bone densitometry system and an ultrasound device. The volume of image data archived per month is 4 GByte. Patient demographics are provided to the modalities via DICOM-Worklist. With these PACS components a department specific archive purely based on DICOM can be realized. During the installation process problems occurred mainly because of the complex DICOM standard for nuclear medicine. Related to that is the problem that most of the software implementations still contain bugs or are not adapted to the needs of a nuclear medicine department (particularly for PET). A communication software for the distribution of nuclear medicine reports and images based on techniques used for the worldwide web is currently tested. (orig.) [German] Fuer eine nuklearmedizinische Klinik ist ein Klinikinformationssystem (KIS) gekoppelt mit einem Radiologieinformationssystem (RIS) sowie einem Bildarchivierungs- und Verteilungssystem (PACS) unabdingbar, um einen schnellen Patientendurchsatz sowie die zeitnahe Uebermittlung von Befunden inklusive nuklearmedizinischen Bildern an zuweisende Stationen, Ambulanzen und externe Zuweiser zu gewaehrleisten. Daher wurde im April 2000 an der Klinik und Poliklinik fuer Nuklearmedizin der Universitaet

  16. TMI cable tracer operation and maintenance manual for assembly 417910

    International Nuclear Information System (INIS)

    Sumstine, R.L.

    1983-11-01

    This manual provides technical information and instructions to operate and maintain the cable tracer designed for the Three Mile Island (TMI) Unit 2 Reactor Building. The TMI cable tracer was developed to allow TMI personnel to trace cables in cable trays that may be tested or sectioned for destructive examination

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

    DEFF Research Database (Denmark)

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

    2007-01-01

    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...

  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. 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.

  20. Use of radioactive tracers in chemical reactions

    International Nuclear Information System (INIS)

    Paci, B.; Saiki, M.

    1979-01-01

    A method for the determination of small quantities of nickel by using radioactive tracers is presented. An analytical application of the displacement reaction between and zinc-ethylenediaminetetraacetate, (Zn-EDTA), labelled with 65 Zn is investigated. This method is based on the extraction of radioactive zinc, displaced by nickel from the zinc chelate, into a dithizone-carbon tetrachloride solution and the subsequent measurement of the activity of an aliquot of the extract. It is shown that the method is very sentitive and nickel can be measured in concentrations as small as 0,1μg/ml or even less, depending on the specific activity of the radioreagent used. The precision and accuracy of the method are determined. An attempt to eliminate the problem of interference by using masking agents or by means of a previous separation of nickel and other interfereing metals, is also made. (Author) [pt

  1. New SPECT and PET dementia tracers

    International Nuclear Information System (INIS)

    Vergote, J.; Chalon, S.; Emond, P.; Vercouillie, J.; Guilloteau, D.; Vergote, J.; Guilloteau, D.; Pappata, J.S.

    2009-01-01

    Single photon emission tomography (SPECT) and positron emission tomography (PET) are techniques to study in vivo neurotransmitter systems, neuro inflammation and amyloid deposits in normal human brain and in dementia. These methods used to explore the integrity of dopaminergic, cholinergic and serotonergic systems in Alzheimer's disease and in other dementias allowed to understand how the neurotransmission was modified in these disorders. Progress in the understanding of pathophysiological and clinical signs of dementia requires an evolution of the radioligands used to carry out an increasingly early and differential diagnosis in addition to monitoring the progression of disease and the effects of therapies. New emerging radiotracers for neuro inflammation or amyloid deposits are essential. In this article, new SPECT and PET tracers are presented. (authors)

  2. Positron emission tomography tracers for imaging angiogenesis

    International Nuclear Information System (INIS)

    Haubner, Roland; Beer, Ambros J.; Wang, Hui; Chen, Xiaoyuan

    2010-01-01

    Position emission tomography imaging of angiogenesis may provide non-invasive insights into the corresponding molecular processes and may be applied for individualized treatment planning of antiangiogenic therapies. At the moment, most strategies are focusing on the development of radiolabelled proteins and antibody formats targeting VEGF and its receptor or the ED-B domain of a fibronectin isoform as well as radiolabelled matrix metalloproteinase inhibitors or α v β 3 integrin antagonists. Great efforts are being made to develop suitable tracers for different target structures. All of the major strategies focusing on the development of radiolabelled compounds for use with positron emission tomography are summarized in this review. However, because the most intensive work is concentrated on the development of radiolabelled RGD peptides for imaging α v β 3 expression, which has successfully made its way from bench to bedside, these developments are especially emphasized. (orig.)

  3. Atmospheric tracer experiments for regional dispersion studies

    International Nuclear Information System (INIS)

    Heffter, J.L.; Ferber, G.J.

    1980-01-01

    Tracer experiments are being conducted to verify atmospheric transport and dispersion calculations at distances from tens to hundreds of km from pollutant sources. In one study, a 2 1/2 year sampling program has been carried out at 13 sites located 30 to 140 km from a source of 85 Kr at the Savannah River Plant in South Carolina. Average weekly concentrations as well as twice-daily concentrations were obtained. Sampling data and meteorological data, including surface, tower, and rawinsonde observations are available on magnetic tape for model verification studies. Some verification results for the Air Resources Laboratories Atmospheric Transort and Dispersion Model (ARL-ATAD) are shown for averaging periods from one week to two years

  4. Use of radioactive tracers in chemical reactions

    International Nuclear Information System (INIS)

    Paci, B.

    1979-01-01

    A method for the determination of small quantities of nickel using radioactive tracers is presented. An analytical application of the displacement reaction between nickel and zinc ethylenediaminetetraacetate labeled with zinc-65 is pursued. This method is based on the extraction of radioactive zinc displaced by nickel from the zinc chelate into a dithizone-carbon tetracloride solution and the subsequent measurement of the activity of an aliquot of the extract. The method is very sensitive and nickel can be measured in concentrations as small as 0.1μg/ml or even less, depending on the specific activity of the radioreagent used. The precision and the accuracy of the method are determined. The problem of interferences, trying to eliminate them by using masking agents or by means of a previous separation between nickel and other interfering metals, is also investigated [pt

  5. National Biomedical Tracer Facility. Project definition study

    International Nuclear Information System (INIS)

    Schafer, R.

    1995-01-01

    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 - , H + , and D + ). The proposed NBTF facility includes an 80 MeV, 1 mA H - cyclotron that will produce proton-induced (neutron deficient) research isotopes

  6. Suitable activated carbon-13 tracer techniques

    International Nuclear Information System (INIS)

    Zhang Weicheng; Peng Xiuru; Wang Yuhua

    1995-12-01

    Feasibility and applicability studies of the proton induced gamma ray emission (PIGE) have been performed. The graphite was firstly bombarded at various proton energies to determine gamma ray yield (and, thus, sensitivities) for the reaction of interest. The accuracy for the determination of 13 C abundance was checked, and the precision with which this value and ratios 13 C/ 12 C may be obtained was established by repetitive analysis samples. The performance of different standards in this determination was assessed. The mathematical treatment was developed for the determination of 13 C abundance in tracer studies, and to derive the equations that govern this method of analysis from first principles, to arrive finally at a simple expression by virtue of the observed regularities. The system was calibrated by measuring the gamma ray yield form the 12 C (p, γ) 13 N and 13 C(p,γ) 14 N reaction as a function of known 13 C enrichment. Using this experimentally determined calibration curve, unknown materials can be assayed. This technique is applicable to the analysis of samples with 13 C enrichments between 0.1% and 90%. The samples of human breath natural samples were analyzed against graphite and Cylinder CO 2 standards. Relative standard deviations were 13 C abundance, an increase in 13 C per cent isotopic abundance from the natural 1.11% (average) to only 1.39% may be ascertained. Finally, PIGE is compared with more classical techniques for analysis of 13 C tracer experiments. Ease and speed are important advantages of this technique over mass spectrometry, and its error is compatible with the natural variation of biological results. (9 refs., 11 figs., 9 tabs.)

  7. Rate equations for tracer studies in recirculating reactors

    Energy Technology Data Exchange (ETDEWEB)

    Happel, J [Columbia Univ., New York (USA). Dept. of Chemical Engineering

    1974-10-01

    The employment of isotopic tracers is a useful technique for gaining insight into the rate controlling steps of a complex chemical reaction such as is frequently encountered in heterogeneous catalysis. An effective procedure has been to superpose tracer transfer on a reaction which is occurring under steady state conditions. If tracer transfer is employed in this fashion it is often possible to assess the individual step velocities in an assumed reaction mechanism. If transient transfer of tracer is now introduced it is possible in addition to estimate surface concentrations of chemisorbed species. The purpose of the present paper is to present the mathematical relationships involved when transfer of the tracer is not differential in the investigation. For this purpose a simple example is chosen to illustrate the various possibilities involved.

  8. Molecular dynamics investigation of tracer diffusion in a simple liquid

    International Nuclear Information System (INIS)

    Ould-Kaddour, F.; Barrat, J.L.

    1991-05-01

    Extensive Molecular-Dynamics (MD) simulations have been carried out for a model trace-solvent system made up of 100 solvent molecules and 8 tracer molecules interacting through truncated Lennard-Jones potentials. The influence of the size ratio between solute and solvent, of their mass ratio and of the solvent viscosity on the diffusivity of a small tracer were investigated. Positive deviations from a Stokes-Einstein behaviour are observed, in qualitative agreement with experimental observations. It was also observed that as tracer and solvent become increasingly dissimilar, their respective dynamics becomes decoupled. We suggest that such decouplings can be interpreted by writing their mobility of the tracer as the sum of two terms, the first one arising from a coupling between tracer dynamics and hydrodynamics modes of the solvent, and the second one describing jump motion in a locally nearly frozen environment. (author). 17 refs, 4 figs, 6 tabs

  9. Rate equations for tracer studies in recirculatinng reactors

    International Nuclear Information System (INIS)

    Happel, J.

    1974-01-01

    The employment of isotopic tracers is a useful technique for gaining insight into the rate controlling steps of a complex chemical reaction such as is frequently encountered in heterogeneous catalysis. An effective procedure has been to superpose tracer transfer on a reaction which is occurring under steady state conditions. If tracer transfer is employed in this fashion it is often possible to assess the individual step velocities in an assumed reaction mechanism. If transient transfer of tracer is now introduced it is possible in addition to estimate surface concentrations of chemisorbed species. The purpose of the present paper is to present the mathematical relationships involved when transfer of the tracer is not differential in the investigation. For this purpose a simple example is chosen to illustrate the various possibilities involved. (auth.)

  10. Benefits of important industrial tracer applications in the GDR

    International Nuclear Information System (INIS)

    Leonhardt, J.W.; Goeldner, R.; Koennecke, H.G.; Kupsch, H.; Luther, D.; Otto, R.; Reinhardt, R.; Ulrich, H.

    1990-01-01

    Tracers can be used to label substances or objects in order to discriminate between them, to follow their movement, to record changes of concentration and distribution between phases, etc. The main advantages of tracer investigations are the contactless recording of signals without influencing the observed process (also under rigorous operation conditions), the high detection sensitivity, the large number of available tracer nuclides (problems of all branches of industry can be solved) and the fact that tracer investigation can be carried out on operating production units, so that they provide valuable checks of the validity of design and process data. The cost-to-benefit ratio can be as low as 1:50. In the following some selected examples of tracer applications and their benefits will be presented. (orig./BBR) [de

  11. 3-D migration experiment - report 2: Instrumentation and tracers

    International Nuclear Information System (INIS)

    Abelin, H.; Birgersson, L.; Gidlund, J.

    1987-11-01

    This report is one of the four reports describing the Stripa 3D experiment where water and tracer flow has been monitored in a specially excavated drift in the Stripa mine. The experiment was performed in a specially excavated drift at the 360 m level in granite. The whole ceiling and upper part of the walls were covered with more than 350 individual plastic sheets where the water flow into the drift could be collected. 11 different tracers were injected at distances between 11 and 50 m from the ceiling of the drift. The flow rate and tracer monitoring was kept up for more than two years. The tracer breakthrough curves and flow rate distributions were used to study the flow paths, velocities, hydraulic conductivities, dispersivities and channeling effects in the rock. The report describes the instrumentation developed and used as well as the tracers that were tested and used in the experiment. (orig.)

  12. Tracer migration experiments in the Stripa mine 1980-1991

    International Nuclear Information System (INIS)

    Birgersson, L.; Widen, H.; Aagren, T.; Neretnieks, I.

    1992-05-01

    During more than 10 years, tracer experiments have been performed in the Stripa mine as part of the Stripa project to investigate the properties of both 'average' fractured rock and fracture zones. Experiments have been performed that have ranged from a few decimeters, to examine the diffusion into the rock matrix, up to tracer migration to a drift more than 50 meters from the injection point. This report compiles the results and experience that have been gained from all these tracer experiments. The experiments that are described in this report are: * The in-situ diffusion experiment where simultaneous flow and diffusion of tracers in undisturbed rock were studied over more than 3 years to validate diffusivities obtained under laboratory conditions. * Migration in a single fracture where water flow distribution and tracer transport were studied using both conservative and sorbing tracers over migration distances up to 10 meters. * The 3-D migration experiment where water inflow and tracer transport to a drift covered with 350 plastic sheet were investigated to get information on flow porosity, dispersion and channeling. The transport distances were between 10 and 56 meters from the injection points to the drift. * The channeling experiments in which the aim was to examine the channeling properties of single fractures in detail. Pressure pulse tests and tracer experiments were performed over a distances of 2 meters. * The tracer migration experiment in the validation drift where the tracer were injected mainly in a fracture zone and the collection was inside both a drift covered with plastic sheets similar to in the 3-D experiment as well as in a borehole. The distances between injection and sampling location were between 10 and 25 meters. (57 refs.) (au)

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

    Science.gov (United States)

    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.

  14. Novel tracer for radiation treatment planning; Welche neuen PET-Tracer braucht die Strahlentherapie?

    Energy Technology Data Exchange (ETDEWEB)

    Schwarzenboeck, S.; Krause, B.J. [Rostock Univ. (Germany). Klinik fuer Nuklearmedizin; Herrmann, K.; Gaertner, F.; Souvatzoglou, M. [Technische Univ. Muenchen (Germany). Klinik fuer Nuklearmedizin; Klaesner, B. [Klinikum Bogenhausen, Muenchen (Germany). Inst. fuer Radiologie und Nuklearmedizin

    2011-07-15

    PET and PET/CT with innovative tracers gain increasing importance in diagnosis and therapy management, and radiation treatment planning in radio-oncology besides the widely established FDG. The introduction of [{sup 18}F]Fluorothymidine ([{sup 18}F]FLT) as marker of proliferation, [{sup 18}F]Fluoromisonidazole ([{sup 18}F]FMISO) and [{sup 18}F]Fluoroazomycin-Arabinoside ([{sup 18}F]FAZA) as tracer of hypoxia, [{sup 18}F]Fluoroethyltyrosine ([{sup 18}F]FET) and [{sup 11}C]Methionine for brain tumour imaging, [{sup 68}Ga]DOTATOC for somatostatin receptor imaging, [{sup 18}F]FDOPA for dopamine synthesis and radioactively labeled choline derivatives for imaging phospholipid metabolism have opened novel approaches to tumour imaging. Some of these tracers have already been implemented into radio-oncology: Amino acid PET and PET/CT have the potential to optimise radiation treatment planning of brain tumours through accurate delineation of tumour tissue from normal tissue, necrosis and edema. Hypoxia represents a major therapeutic problem in radiation therapy. Hypoxia imaging is very attractive as it may allow to increase the dose in hypoxic tumours potentially allowing for a better tumour control. Advances in hybrid imaging, i.e. the introduction of MR/PET, may also have an impact in radio-oncology through synergies related to the combination of molecular signals of PET and a high soft tissue contrast of MRI as well as functional MRI capabilities. (orig.)

  15. Bromide as a tracer for studying water movement and nitrate displacement in soils: comparison with stable isotope tracers

    International Nuclear Information System (INIS)

    Russow, R.; Knappe, S.

    1999-01-01

    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 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 2 O, bromide and [ 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 [de

  16. 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.)

  17. Dimensioning and design rules for sliding bearings; optimisation problems; Bemessungs- und Gestaltungsregeln fuer Gleitlager: Optimierungsfragen

    Energy Technology Data Exchange (ETDEWEB)

    Spiegel, K. [Fachhochschule Duesseldorf (Germany); Fricke, J.

    2000-07-01

    Already in the design stage of sliding bearings, optimal conditions for operation at a later stage should be envisaged. The contribution presents hints for optimal design and calculation of radial and axial bearings, e.g. gap design, optimised supporting strength, friction loss and lubricant throughput, lubricant exchange and lubricant heat exchange, and improved control of internal lubricant flow. [German] Bei der Auslegung von Gleitlagern ist es von Interesse, moeglichst optimale Bedingungen fuer den spaeteren Betrieb zu schaffen. Im vorliegenden Beitrag werden einige bereits bekannte und auch neue Hinweise zur optimalen Gestaltung und Berechnung, sowohl fuer Radial- als auch Axiallager gegeben. Dies betreffen im wesentlichen: die Gestaltung des Spaltverlaufs, Empfehlungen zur Optimierung der Tragfaehigkeit, der Reibungsverluste und des Schmierstoffdurchsatzes, Hinweise zum Schmierstoff- bzw. Schmierstoff-Waermeaustausch und die Verbesserung der inneren Schmierstofffuehrung. (orig.)

  18. Oil-free piston compressors for compressed air and gas; Oellose Kolbenkompressoren fuer Druckluft und Gase

    Energy Technology Data Exchange (ETDEWEB)

    Frefel, B. [Fritz Haug AG, St. Gallen (Switzerland)

    2002-11-01

    Oil-free compressors are lubricated with special materials in dry operation. The technology was developed 35 years ago by the Swiss company, Fritz Haug AG. Originally developed for 10 - 40 bar, oil-free compressors are now available for both the low-pressure and high-pressure range. [German] Unter dem Begriff ''oellose Kompressoren'' versteht man Verdichter, die in der ganzen Anlage keinen Tropfen Oel verwenden, weder im Fuehrungs- und Verdichtungstell noch im Triebwerk. Die Schmierung erfolgt mit speziellen Materiallen im Trockenlauf. Die Technik der oellosen und trockenlaufenden Kolbenkompressoren wurde bereits vor rund 35 Jahren von der schweizer Firma Fritz Haug AG entwickelt. Anfaenglich war die Anwendung der Verdichtung von Luft auf 10 bis 40 bar vorbehalten. Durch Weiterentwicklungen in neue Materiallen und in der Konstruktion besteht heute auch ein umfangreiches Sortiment an Kompressoren fuer die oellose und trockene Verdichtung von Gasen fuer den Nieder- und Hochdruckbereich. (orig.)

  19. The Environmental Impact Assessment (EIA) for high-voltage overhead lines; Umweltvertraeglichkeitspruefung (UVP) fuer Hochspannungsfreileitungen

    Energy Technology Data Exchange (ETDEWEB)

    Klockow, S. [Landesentwicklungsgesellschaft Baden-Wuerttemberg, Stuttgart (Germany). Abt. Umwelt

    1996-11-04

    In some of the federal states of Germany the licensing of new or the laying or existing high-voltage overhead lines requires an environmental impact assessment. For many utility companies, however, environmental impact assessments for high-voltage lines are virgin territory. Experience shows that preparing the documentation is not a major problem. Questions usually arise over details such as the calculation of possible incidents or the comparison of different layouts. The authors describes general approaches and strategies and looks at specific problems. (orig.) [Deutsch] Bei der Genehmigung neuer oder der Verlegung vorhandener Hochspannungsfreileitungen ist in einigen Bundeslaendern eine Umweltvertraeglichkeitspruefung durchzufuehren. Fuer viele Energieversorgungsunternehmen ist die Erarbeitung von Umweltvertraeglichkeitsstudien fuer Hochspannungsleitungen aber noch Neuland. Praxiserfahrungen zeigen, dass die Erarbeitung der erforderlichen Unterlagen ohne groessere Schwierigkeiten moeglich ist. Fragen ergeben sich dabei aber bei speziellen Details, z.B. bei der Betrachtung von moeglichen Stoerfaellen oder beim Vergleich von Trassenvarianten. Der Verfasser skizziert das allgemeine Vorgehen und erlaeutert ausfuehrlich die Detailprobleme. (orig.)

  20. 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.)

  1. Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS). Annual report 2010/2011

    International Nuclear Information System (INIS)

    2011-01-01

    The annual report 2010/11 of the Gesellschaft fuer Anlagen- und Reaktorsicherheit (GRS) covers the following topics: organization, corporate development and public relations; reactor accident in Fukushima; Projects and work priorities (reactor safety; waste management; radiation and environmental protection; international projects); project management and project support; equity participations and subsidiaries (RISKAUDIT IRSN/GRS International; institute for safety technologies (ISTec), European Nuclear Safety Training and Tutoring Institute (ENSTTI)).

  2. Use of process observers at sewage treatment plants; Einsatz von Prozessbeobachtern fuer Klaeranlagen

    Energy Technology Data Exchange (ETDEWEB)

    Jumar, U.; Alex, J. [Institut fuer Kommunikation und Automation e.V. Magdeburg (IFAK), Barleben (Germany); Rosenwinkel, K.H.; Obenaus, F. [Hannover Univ. (Germany). Inst. fuer Siedlungswasserwirtschaft und Abfalltechnik

    1999-07-01

    The paper describes the use of online simulation for prognosticating plant behaviour, training plant operators, and for obtaining state data not to be obtained otherwise. Whereas, for the mathematical modelling of the process, the established approaches Activated Sludge Model (ASM) 1 and 2 could be reverted to, new methodics needed to be developed for continuous model tracking in order to solve the conflict between a large number of parameters in the model and scarce online measuring data on the spot. The result is a practicable solution which harnesses available knowledge concerning the significance of suitable parameters for model adaptation. First of all, essential demands on and objectives of a process observer for sewage treatment plants are elaborated. Then a software system is described with reference to successful pilot installations which permits model-based process control and remote monitoring of sewage treatment plant. (orig.) [German] Der Beitrag beschreibt die Nutzung der Online-Simulation fuer die Prognose des Anlagenverhaltens, das Training der Anlagenfahrer und die Gewinnung ansonsten nicht messbarer Zustandsinformationen. Waehrend fuer die mathematische Modellierung des Prozesses auf die etablierten Ansaetze ASM 1 und 2 (Activated Sludge Model) zurueckgegriffen werden konnte, musste fuer die laufende Modellnachfuehrung eine neue Methodik entwickelt werden, um den Konflikt zwischen grosser Parameteranzahl im Modell und geringer Online-Messinformation vor Ort zu loesen. Das Ergebnis ist eine praktikable Loesung, die das vorhandene Wissen um die Signifikanz zur Modellanpassung geeigneter Parameter ausnutzt. In den folgenden Ausfuehrungen werden zunaechst wesentliche Anforderungen und Zielstellungen eines Prozessbeobachters fuer Klaeranlagen herausgearbeitet. Unter Bezugnahme auf erfolgreiche Pilotinstallationen wird anschliessend ein Software-System vorgestellt, das eine modellgestuetzte Betriebsfuehrung und Fernueberwachung von Klaeranlagen

  3. 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.)

  4. Adaptive real-time models of vehicle dynamics; Adaptive Echtzeitmodelle fuer die Kraftfahrzeugdynamik

    Energy Technology Data Exchange (ETDEWEB)

    Halfmann, C.; Holzmann, H.; Isermann, R. [Technische Univ. Darmstadt (Germany). Inst. fuer Automatisierungstechnik; Hamann, C.D.; Simm, N. [Opel (A.) AG, Ruesselsheim (Germany). Gruppe Chassis und Fahrerassistenzsysteme

    1999-12-01

    The application of modern simulation tools offering additional support during the vehicle development process is accepted to a large extent by most car manufacturers. Just like new model-based control strategies, these simulation investigations require very accurate - and thus very complex - models of vehicle dynamics, which can be processed in real time. As an example of such a vehicle model, this article describes a real-time vehicle simulation model which was developed at the Institute of Automatic Control at Darmstadt University of Technology, in co-operation with the ITDC of the Adam OPEL AG. By applying modern adaptation techniques, this vehicle model is able to calculate onboard the important variables describing the actual driving state even if the environmental conditions change. (orig.) [German] Der Einsatz von Simulationswerkzeugen zur Unterstuetzung der Fahrzeugentwicklung hat sich bei den meisten Automobilherstellern weitgehend durchgesetzt. Ebenso wie neuartige modellbasierte Regelstrategien verlangen diese Simulationsuntersuchungen nach immer exakteren - und damit komplexeren - fahrdynamischen Modellen, die in Echtzeit ausgewertet werden. Als Beispiel fuer ein solches Gesamtfahrzeugmodell beschreibt dieser Beitrag ein echtzeitfaehiges Modell fuer die Bewegung des Fahrzeugs um alle drei Hauptachsen, das am Institut fuer Automatisierungstechnik der TU Darmstadt in Kooperation mit dem Internationalen Technischen Entwicklungszentrum (ITEZ) der Adam Opel AG entwickelt wurde. Es ist durch den Einsatz von Adaptionsmethoden in der Lage, wichtige fahrdynamische Zustandsgroessen im Fahrzeug auch unter veraenderlichen Umgebungsbedingungen zu ermitteln. (orig.)

  5. The European Tracer Experiment - experimental results and database

    International Nuclear Information System (INIS)

    Nodop, K.; Connolly, R.; Girardi, F.

    1997-01-01

    As part of the European Tracer Experiment (ETEX) two successful atmospheric experiments were carried out in October and November, 1994. Perfluorocarbon (PFC) tracers were released into the atmosphere in Monterfil, Brittany, and air samples were taken at 168 stations in 17 European countries for 72 hours after the release. Upper air tracer measurements were made from three aircraft. During the first experiment a westerly air flow transported the tracer plume north-eastwards across Europe. During the second release the flow was eastwards. The results from the ground sampling network allowed the determination of the cloud evolution as far as Sweden, Poland and Bulgaria. Typical background concentrations of the tracer used are around 5 to 7 fl/l in ambient air. Concentrations in the plume ranged from 10 to above 200 fl/l. The tracer release characteristics, the tracer concentrations at the ground and in upper air, the routine and additional meteorological observations at the ground level and in upper air, trajectories derived from constant-level balloons and the meteorological input fields for long-range transport (LRT) models are assembled in the ETEX database. The ETEX database is accessible via the Internet

  6. Methods of 15N tracer research in biological systems

    International Nuclear Information System (INIS)

    Hirschberg, K.; Faust, H.

    1985-01-01

    The application of the stable isotope 15 N is of increasing importance in different scientific disciplines, especially in medicine, agriculture, and the biosciences. The close correlation between the growing interest and improvements of analytical procedures resulted in remarkable advances in the 15 N tracer technique. On the basis of the latest results of 15 N tracer research in life sciences and agriculture methods of 15 N tracer research in biological systems are compiled. The 15 N methodology is considered under three headings: Chemical analysis with a description of methods of sample preparation (including different separation and isolation methods for N-containing substances of biological and agricultural origin) and special procedures converting ammonia to molecular nitrogen. Isotopic analysis with a review on the most important methods of isotopic analysis of nitrogen: mass spectrometry (including the GC-MS technique), emission spectrometry, NMR spectroscopy, and other analytical procedures. 15 N-tracer techniques with a consideration of the role of the isotope dilution analysis as well as different labelling techniques and the mathematical interpretation of tracer data (modelling, N turnover experiments). In these chapters also sources of errors in chemical and isotopic analysis, the accuracy of the different methods and its importance on tracer experiments are discussed. Procedures for micro scale 15 N analysis and aspects of 15 N analysis on the level of natural abundance are considered. Furthermore some remarks on isotope effects in 15 N tracer experiments are made. (author)

  7. Fluorinated tracers for imaging cancer with positron emission tomography

    International Nuclear Information System (INIS)

    Couturier, Olivier; Chatal, Jean-Francois; Luxen, Andre; Vuillez, Jean-Philippe; Rigo, Pierre; Hustinx, Roland

    2004-01-01

    2-[ 18 F]fluoro-2-deoxy-d-glucose (FDG) is currently the only fluorinated tracer used in routine clinical positron emission tomography (PET). Fluorine-18 is considered the ideal radioisotope for PET imaging owing to the low positron energy (0.64 MeV), which not only limits the dose rate to the patient but also results in a relatively short range of emission in tissue, thereby providing high-resolution images. Further, the 110-min physical half-life allows for high-yield radiosynthesis, transport from the production site to the imaging site and imaging protocols that may span hours, which permits dynamic studies and assessment of potentially fairly slow metabolic processes. The synthesis of fluorinated tracers as an alternative to FDG was initially tested using nucleophilic fluorination of the molecule, as performed when radiolabelling with iodine-124 or bromide-76. However, in addition to being long, with multiple steps, this procedure is not recommended for bioactive molecules containing reactive groups such as amine or thiol groups. Radiochemical yields are also often low. More recently, radiosynthesis from prosthetic group precursors, which allows easier radiolabelling of biomolecules, has led to the development of numerous fluorinated tracers. Given the wide availability of 18 F, such tracers may well develop into important routine tracers. This article is a review of the literature concerning fluorinated radiotracers recently developed and under investigation for possible PET imaging in cancer patients. Two groups can be distinguished. The first includes ''generalist'' tracers, i.e. tracers amenable to use in a wide variety of tumours and indications, very similar in this respect to FDG. These are tracers for non-specific cell metabolism, such as protein synthesis, amino acid transport, nucleic acid synthesis or membrane component synthesis. The second group consists of ''specific'' tracers for receptor expression (i.e. oestrogens or somatostatin), cell

  8. A tracer diffusion model derived from microstructure

    International Nuclear Information System (INIS)

    Lehikoinen, Jarmo; Muurinen, Arto; Olin, Markus

    2012-01-01

    Document available in extended abstract form only. Full text of publication follows: Numerous attempts have been made to explain the tracer diffusion of various solutes in compacted clays. These attempts have commonly suffered from an inability to describe the diffusion of uncharged and charged solutes with a single unified model. Here, an internally consistent approach to describing the diffusion of solutes in a heterogeneous porous medium, such as compacted bentonite, in terms of its microstructure is presented. The microstructure is taken to be represented by a succession of unit cells, which consist of two consecutive regions (Do, 1996). In the first region, the diffusion is viewed to occur in two parallel paths: one through microcrystalline units (micropores) and the other through meso-pores between the microcrystalline units. Solutes exiting these two paths are then joined together to continue diffusing through the second, disordered, region, connecting the two adjacent microcrystalline units. Adsorption (incl. co-ion exclusion) is thought to occur in the micropores, whereas meso-pores and the disordered region accommodate free species alone. Co-ions are also assumed to experience transfer resistance into and out of the micropores, which is characterized in the model by a transmission coefficient. Although the model is not new per se, its application to compacted clays has never been attempted before. It is shown that in the limit of strong adsorption, the effective diffusivity is limited from above only by the microstructural parameters of the model porous medium. As intuitive and logical as this result may appear, it has not been proven before. In the limit of vanishing disordered region, the effective diffusivity is no longer explicitly constrained by any of the model parameters. The tortuosity of the diffusion path, i.e. the quotient of the actual diffusion path length in the porous-medium coordinates and the characteristic length of the laboratory frame

  9. Microbial DNA; a possible tracer of groundwater

    Science.gov (United States)

    Sugiyama, Ayumi; Segawa, Takuya; Furuta, Tsuyumi; Nagaosa, Kazuyo; Tsujimura, Maki; Kato, Kenji

    2017-04-01

    chemical materials dissolved in groundwater. Though viral particle was employed as a tracer to chase the movement of groundwater, it doesn't tell the chemical and physical environmental condition where the particle was incorporated into groundwater. Thus, we propose microbial DNA as a new tracer to track the route of groundwater.

  10. Applied chemistry and environmental engineering for engineers. Manual for students and practicians. 2. ed.; Angewandte Chemie und Umwelttechnik fuer Ingenieure. Handbuch fuer Studium und betriebliche Praxis

    Energy Technology Data Exchange (ETDEWEB)

    Fessmann, J.; Orth, H.

    2002-07-01

    This is a practically oriented textbook for chemistry and environmental protection training of students of mechanical engineering, vehicle engineering, electrical engineering, space HVAc engineering etc. Students are also given useful information on the practical applications of chemistry and on environmental protection in industrial practice. The book also contains problem solutions for managing engineers in organizations of the metal and electrical branch who are confronted with chemical problems in chemical engineering, quality assurance, industrial safety and environmental protection. [German] Das Handbuch vermittelt in konzentrierter Form die Grundlagen der Chemie und Umwelttechnik und schlaegt rasch die Bruecke zur industriellen Anwendung bevorzugt in der Metall- und Elektroindustrie. Das Handbuch ist ein praxisorientiertes Lehrbuch fuer die Chemie- und Umweltschutzausbildung von Ingenieurstudenten der Fachrichtungen Maschinenbau, Fahrzeugtechnik, Elektrotechnik, Versorgungstechnik u.a. Darueberhinaus finden Schueler von Chemieleistungskursen an Gymnasien oder Chemiestudenten an Fachhochschulen oder Universitaeten viele nuetzliche Informationen ueber die Anwendungen von Chemie und Umweltschutz in der industriellen Praxis. Nicht zuletzt enthaelt das Buch Problemloesungen fuer Betriebsingenieure, insbesondere aus dem Bereich der Metall- und Elektrobranche, die mit chemischen Fragestellungen in der Verfahrenstechnik, Qualitaetssicherung oder Arbeits-/Umweltschutzueberwachung konfrontiert sind. (orig.)

  11. Contamination Tracer Testing With Seabed Rock Drills: IODP Expedition 357

    Science.gov (United States)

    Orcutt, B.; Bergenthal, M.; Freudenthal, T.; Smith, D. J.; Lilley, M. D.; Schneiders, L.; Fruh-Green, G. L.

    2016-12-01

    IODP Expedition 357 utilized seabed rock drills for the first time in the history of the ocean drilling program, with the aim of collecting intact core of shallow mantle sequences from the Atlantis Massif to examine serpentinization processes and the deep biosphere. This new drilling approach required the development of a new system for delivering synthetic tracers during drilling to assess for possible sample contamination. Here, we describe this new tracer delivery system, assess the performance of the system during the expedition, provide an overview of the quality of the core samples collected for deep biosphere investigations based on tracer concentrations, and make recommendations for future applications of the system.

  12. Contamination tracer testing with seabed drills: IODP Expedition 357

    Science.gov (United States)

    Orcutt, Beth N.; Bergenthal, Markus; Freudenthal, Tim; Smith, David; Lilley, Marvin D.; Schnieders, Luzie; Green, Sophie; Früh-Green, Gretchen L.

    2017-11-01

    IODP Expedition 357 utilized seabed drills for the first time in the history of the ocean drilling program, with the aim of collecting intact sequences of shallow mantle core from the Atlantis Massif to examine serpentinization processes and the deep biosphere. This novel drilling approach required the development of a new remote seafloor system for delivering synthetic tracers during drilling to assess for possible sample contamination. Here, we describe this new tracer delivery system, assess the performance of the system during the expedition, provide an overview of the quality of the core samples collected for deep biosphere investigations based on tracer concentrations, and make recommendations for future applications of the system.

  13. Positron emitting tracers for studies of cocaine

    International Nuclear Information System (INIS)

    Fowler, J.S.; Gatley, S.J.; MacGregor, R.R.; Wolf, A.P.; Yu, D.W.; Dewey, S.L.; Schlyer, D.J.; Volkow, N.D.; Bendriem, B.; Logan, J.

    1990-01-01

    The use of PET to study the behavior and mechanism of action of therapeutic drugs and substances of abuse can be approached from a number of perspectives. The most common approach is to measure the effect of a drug on some aspect of metabolism and requires well characterized radiotracers whose behavior in vivo can be related to a discrete biochemical transformation. A second approach is to study the labeled drug itself. This provides information on the drug's regional distribution and kinetics as well as its pharmacological profile and metabolism. Cocaine has been labeled in different positions with carbon-11 and with fluorine-18 and the stereoisomers of cocaine have also been labeled to characterize its binding and metabolism in human and baboon brain. Regional cocaine binding as measured by PET is consistent with reversible binding to striatal dopamine reuptake sites and its time course parallels the behavioral activation of cocaine. The behaviorally inactive enantiomer (+)-cocaine is rapidly metabolized in serum preventing its entry into the brain. These PET tracers are useful in understanding the neurochemical basis of cocaine's action

  14. National Biomedical Tracer Facility: Project definition study

    International Nuclear Information System (INIS)

    Heaton, R.; Peterson, E.; Smith, P.

    1995-01-01

    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

  15. Isotope and chemical tracers in groundwater hydrology

    International Nuclear Information System (INIS)

    Kendall, C.; Stewart, M.K.; Morgenstern, U.; Trompetter, V.

    1999-01-01

    The course sessions cover: session 1, Fundamentals of stable and radioactive isotopes; session 2, Stable oxygen and hydrogen isotopes in hydrology: background, examples, sampling strategy; session 3, Catchment studies using oxygen and hydrogen isotopes: background - the hydrologic water balance, evapotranspiration - the lion's share, runoff generation - new water/old water fractions, groundwater recharge - the crumbs; session 4, Isotopes in catchment hydrology: survey of applications, future developments; session 5, Applications of tritium in hydrology: background and measurement, interpretation, examples; session 6, Case studies using mixing models: Hutt Valley groundwater system, an extended mixing model for simulating tracer transport in the unsaturated zone; session 7, Groundwater dating using CFC concentrations: background, sampling and measurement, use and applications; session 8, Groundwater dating with carbon-14: background, sampling and measurement, use and applications; session 9, NZ case studies: Tauranga warm springs, North Canterbury Plains groundwater; session 10, Stable carbon and nitrogen isotopes: background and examples, biological applications of C-N-S isotopes; session 11, New developments in isotope hydrology: gas isotopes, compound specific applications, age dating of sediments etc; session 12, NZ case studies: North Canterbury Plains groundwater (continued), Waimea Plains groundwater. (author). refs., figs

  16. 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.

  17. Chemical and pharmacological aspects of cerebral tracers

    International Nuclear Information System (INIS)

    Rapin, J.R.; Duterte, D.; Le Poncin-Lafitte, M.; Coornaert, S.; Desplanches, G.; Bardy, A.; Askienazy, S.; Moretti, J.L.; Raynaud, C.

    1983-01-01

    Among the iodophenylalkylamines studied and labelled with iodine 125 or iodine 123, N-isopropyl-iodo-amphetamin (IAMP) was selected and proposed as tracer for blood flow, a ''chemical embolus'' having almost 100% extraction in the brain. A new way of obtaining N-isopropyl-p-iodo-amphetamin is proposed and the easily-applied exchange reaction with iodine 125 or 123 gives a product with a radiochemical purity of more than 96% and an unexchanged radioactive iodine content of less than 1%. The pharmacokinetic study of this product in the Wistar rat showed distribution in three compartments and the appearance of a steady state by the fourth minute. The target organes are the lungs, liver and brain. The latter receives 3% of the radioactivity and the autoradiographic study shows that the early distribution in the brain for IAMP closely equal the blood flow as found by a diffusible indicator. In the first hour, the redistribution is very low and at this time although IAMP is proposed for the study of regional blood flow, it does not exactly determine the flow but allows the cell activity [fr

  18. Chemical and pharmacological aspects of cerebral tracers

    International Nuclear Information System (INIS)

    Rapin, J.R.; Duterte, D.; Le Poncin-Lafitte, M.; Coornaert, S.; Desplanches, G.; Bardy, A.; Moretti, J.L.; Raynaud, C.

    1983-01-01

    Among the iodophenylalkylamines studied and labelled with iodine 125 or iodine 123, N-isopropyl-iodo-amphetamin (IAMP) was selected and proposed as tracer for blood flow, a ''chemical embolus'' having almost 100% extraction in the brain. A new way of obtaining N-isopropyl-p-iodo-amphetamin is proposed and the easily-applied exchange reaction with iodine 125 or 123 gives product with a radiochemical purity of more than 96% and an unexchanged radioactive iodine content of less than 1%. The pharmacokinetic study of this product in the Wistar rat showed distribution in three compartments and the appearance of a steady state by the fourth minute. The target organs are the lungs, liver and brain. The latter receives 3% of the radioactivity and the autoradiographic study shows that the early distribution in the brain for IAMP closely equals the blood flow as found by a diffusible indicator. In the first hour, the redistribution is very low and at this time although IAMP is proposed for the study of regional blood flow, it does not exactly determine the flow but rather mirrors cell activity [fr

  19. 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.

  20. Our experience of blood flow measurements using radioactive tracers

    International Nuclear Information System (INIS)

    Danet, Bernard.

    1974-01-01

    A critical study of blood flow measuring methods is proposed. After a review of the various diffusible and non-diffusible radioactive tracers and the corresponding detector systems, the principles which allow to measure blood flow from the data so obtained, are studied. There is a different principle of flow measurement for each type of tracer. The theory of flow measurement using non-diffusible tracers (human serum albumin labelled with 131 I or sup(99m)Tc, 113 In-labelled siderophiline) and its application to cardiac flow measurement are described first. Then the theory of flow measurement using diffusible tracers ( 133 Xe, 85 Kr) and its application to measurement of blood flow through tissues (muscles and kidney particularly) are described. A personal experience of this various flow measurements is reported. The results obtained, the difficulties encountered and the improvments proposed are developed [fr

  1. Diffusing passive tracers in random incompressible flows: Statistical topography aspects

    International Nuclear Information System (INIS)

    Klyatskin, V.I.; Woyczynski, W.A.; Gurarie, D.

    1996-01-01

    The paper studies statistical characteristics of the passive tracer concentrations and of its spatial gradient, in random incompressible velocity fields from the viewpoint of statistical topography. The statistics of interest include mean values, probability distributions, as well as various functionals characterizing topographic features of tracers. The functional approach is used. We consider the influence of the mean flow (the linear shear flow) and the molecular diffusion coefficient on the statistics of the tracer. Most of our analysis is carried out in the framework of the delta-correlated (in time) approximation and conditions for its applicability are established. But we also consider the diffusion approximation scheme for finite correlation radius. The latter is applied to a diffusing passive tracer that undergoes sedimentation in a random velocity field

  2. Application of fluorescent-and radioactive tracers in Sedimentalogy

    International Nuclear Information System (INIS)

    Alencar, L.M.L. de.

    1981-01-01

    The development of techniques of sediment labelling, creating the possibility of using fluorescent and radioactive tracers not yet applied in Brazil, in the area of sedimentology, is studied. (A.R.H.) [pt

  3. Simulation of Tracer Transport in Porous Media: Application to Bentonites

    International Nuclear Information System (INIS)

    Bru, A.; Casero, D.

    2001-01-01

    We present a formal framework to describe tracer transport in heterogeneous media, such as porous media like bentonites. In these media, mean field approximation is not valid because there exist some geometrical constraints and the transport is anomalous. (Author)

  4. 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...

  5. Hydraulic characterisation of karst systems with man-made tracers

    International Nuclear Information System (INIS)

    Werner, A.

    1998-01-01

    Tracer experiments using man-made tracers are common in hydrogeological exploration of groundwater aquifers in karst systems. In the present investigation, a convection-dispersion model (multidispersion model with consideration of several flow paths) and a single-cleft model (consideration of the diffusion between the cleft and the surrounding rock matrix) were used for evaluating tracer experiments in the main hydrological system of the saturated zone of karst systems. In addition to these extended analytical solutions, a numerical transport model was developed for investigating the influence of the transient flow rate on the flow and transport parameters. Comparative evaluations of the model approaches for the evaluation of tracer experiments were made in four different karst systems: Danube-Aach, Paderborn, Slowenia and Lurbach, of which the Danube-Aach system was considered as the most important. The investigation also comprised three supplementary experiments in order to enable a complete hydraulic characterisation of the system. (orig./SR) [de

  6. Systems approach to tracer data in groundwater hydrology

    International Nuclear Information System (INIS)

    Saxena, R.K.

    1977-01-01

    A brief review of current mathematical methods for the analysis of tracer data in groundwater hydrology has been given. The description of the hydrological cycle as a whole or in part, by a system (compartment) or sub-system under linear and stationary conditions is discussed. Basic concepts of transit time, residence time, their distributions in time and response characteristics of a system are outlined. From the knowledge of tracer input, output and systems response function for a generalised system, reservoir capacity and storage for given period can be estimated. Use of a time series model for environmental tracer data in discreet time scale aimed at the solution of hydrological problems e.g. mean transit time and reservoir capacity is also explored. It is concluded that the combination of tracer data with systems approach can go a long way in the study of some complex hydrological problems. (author)

  7. ABC crescent. Energy concept with active storage system for a Hamburg office building; ABC - Bogen. Energiekonzept mit Aktivspeichersystem fuer ein Buerohaus in Hamburg

    Energy Technology Data Exchange (ETDEWEB)

    Stoll, J. [HL-Technik AG, Muenchen (Germany). Bereich Future Building Designs, Thermische Bauphysik-Bauklimatik

    1999-07-01

    This new multifunctional building will house a shopping mall and offices. Natural ventilation is favoured as far as possible. Technical facilities were minimised in order to save resources and reduce the operating cost. The architectural design was to be as functional as possible. [German] Mit dem ABC-Bogen in Hamburg entsteht in unmittelbarer Naehe zum Gaensemarkt ein multifunktionales Gebaeude mit Passagen, Laeden und Bueros - ein neuer Akzent in der Hamburger Innenstadt. Das grosszuegig verglaste Gebaeude sollte nach den Zielen der Hamburger Architekten BRT - Bothe, Richter, Teherani und der Projektentwicklung (SF-Bau Projektentwicklung GmbH, NL Hamburg) soweit wie moeglich natuerlich gelueftet werden. Die gebaeudetechnische Ausruestung der Bueros war zur Ressourcenschonung und Begrenzung der Betriebskosten auf ein Mindestmass zu beschraenken. Bei der Fassadengestaltung sollten funktionelle Aspekte absoluten Vorrang haben. (orig.)

  8. Results of repeat tracer tests at Ohaaki, NZ

    International Nuclear Information System (INIS)

    McCabe, W.J.; Morris, C.

    1995-01-01

    During 20 years of tracer testing at Ohaaki a number of wells have been used more than once as tracer injection sites. In studying the various responses obtained it has been necessary to consider variations in the experimental test conditions before making comparisons which relate to field conditions. Some very significant changes have occurred in the field hydrology in recent years and water flow speeds as high as those encountered at Wairakei have been demonstrated. (author). 4 refs., 2 tabs., 10 figs

  9. Evaporation rate in containers used for storing radioactive tracer solutions

    International Nuclear Information System (INIS)

    Gascon, J.L.

    2002-01-01

    In radiochemical analysis, the storage of a tracer solution is an important issue to bear in mind. The evaporation of the tracer solution depends on the type of container used for storing. Evaporation rate in four kinds of containers, i.e., flame-sealed glass ampoule, sealed glass flask, flame-sealed polyethylene ampoule and screw glass vial was studied. It is concluded that the evaporation rate depends on the system of closing. (author)

  10. Labeling of fruitflies and their identification by tracer activation

    International Nuclear Information System (INIS)

    Haisch, A.; Forster, S.; Staerk, H.

    1975-01-01

    A technique was worked out to label and identify cherry fruit flies (Rhagoletic cerasi L.) in large numbers. For that purpose, the tracers dysprosium and samarium were mingled with a carrier substance (silica gel) which, mixed with silica sand, formed the substrate for emergence. The flies, the pupae of which were in this substrate, took up with their ptilinum-labeled silica gel during their crawling through the sand up to the surface. The tracer was detected after its activation by neutron irradiation

  11. Use of tracers for locating and designing sea outfalls

    International Nuclear Information System (INIS)

    Gauthier, M.; Quetin, B.

    1976-01-01

    Various tracers are used for investigating the propagation of substances in solution or suspension (radioactive, biological, chemical substances and floats). Floats and dyes are the most employed. The main problems associated with the use of such tracers and data interpretation are discussed and it is shown how effective quantitative data can be obtained, especially as regards estimation of turbulent diffusion parameters and identification of suitable dispersion methods for purposes of determining pollutant concentration and areas affected thereby [fr

  12. 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.)

  13. Lanthanide-based fluorescent tracers in complex media

    International Nuclear Information System (INIS)

    Brichart, Thomas

    2014-01-01

    Tracers are objects allowing the determination of the position or the distribution of a product; tracers are currently used in a great variety of domains. Despite the fact that each field has it's own specifications, it is possible to find tracers in medicine (contrast agents), anti-counterfeiting or geological exploration. We have developed lanthanide complex tracers for oil field injection waters. Those tracers, derived from the DOTA, have been detected at concentration lower than 1 ppb, thanks to a simple and compact apparatus. This detection has been made possible by the use of time-resolved fluorescence spectroscopy, this technique allows us to get rid of the background noise created by the intrinsic fluorescence of oil residues that are present in production waters. We also demonstrated how we can, through a reverse microemulsion synthesis, encapsulate several different dyes inside a single nanoparticle composed of a gold core and a silica shell. We showed as well, how those particles can be used as smart tracers to gather data, such as temperature, pH, solvents, etc. inside the well. Finally the use of lanthanides and scale inhibitors properties allowed us to create a simple and fast dosing protocol of such scale inhibitors in injection waters. This dosage will then allow the quick adjustment of their concentration inside each well. (author) [fr

  14. Determination of the self purification of streams using tracers

    International Nuclear Information System (INIS)

    Salviano, J.S.

    1982-04-01

    A methodology for the 'in situ' evaluation of the self purification of streams is discussed. It consists of the simultaneous injection of two tracers into the stream. One of the tracers is oxidized by biochemical processes. It can be either artificially supplied to the stream or a naturally present component can be used. This tracer is used for the determination of the self purification parameters. The other tracer is conservative and allows for the hydrodynamic effects. Tests have been carried out in two streams with quite different hydrodynamic and physicochemical conditions. In the first stream, with a flow-rate of about 0.9 m 3 /s, urea was used as the nonconservative tracer. In the other stream, which had a flow-rate of about 5 m 3 /s, only a radioactive tracer has been used, and the rate of biochemical oxidation has been determined from BOD measurements. Calculations have been implemented on a digital computer. In both cases it was found that the reoxygenation rate is more conveniently determined by empirical formulas. Results from both tests have been deemed realistic by comparison with similar experiments. (Author) [pt

  15. Root zone effects on tracer migration in arid zones

    International Nuclear Information System (INIS)

    Tyler, S.W.; Walker, G.R.

    1994-01-01

    The study of groundwater recharge and soil water movement in arid regions has received increased attention in the search for safe disposal sites for hazardous wastes. In passing through the upper 1 to 2 m of most soil profiles, tracers indicative of recharge such as Cl, 2 H, 18 O, Br, 3 H, and 56 Cl are subjected to a wide range of processes not encountered deeper in the profile. This transition zone, where water enters as precipitation and leaves as recharge, is often ignored when environmental tracers are used to estimate deep soil water flux and recharge, yet its effect may be profound. In this work, we reexamine the processes of root extraction and its effect on the velocity and distribution of tracers. Examples are presented for idealized conditions, which show clearly the relation between the root zone processes and the deep drainage or recharge. The results indicate that, when recharge is small and root zone processes are not accounted for, tracer techniques can significantly overestimate recharge until the tracer has moved well below the root zone. By incorporating simple models of root zone processes, a clearer understanding of tracer distributions and a more accurate estimate of recharge can then be made. 11 refs., 9 figs

  16. 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.

  17. Tracer verification and monitoring of containment systems (II)

    International Nuclear Information System (INIS)

    Williams, C.V.; Dunn, S.D.; Lowry, W.E.

    1997-01-01

    A tracer verification and monitoring system, SEAtrace trademark, has been designed and field tested which uses gas tracers to evaluate, verify, and monitor the integrity of subsurface barriers. This is accomplished using an automatic, rugged, autonomous monitoring system combined with an inverse optimization code. A gaseous tracer is injected inside the barrier and an array of wells outside the barrier are monitored. When the tracer gas is detected, a global optimization code is used to calculate the leak parameters, including leak size, location, and when the leak began. The multipoint monitoring system operates in real-time, can be used to measure both the tracer gas and soil vapor contaminants, and is capable of unattended operation for long periods of time (months). The global optimization code searches multi-dimensional open-quotes spaceclose quotes to find the best fit for all of the input parameters. These parameters include tracer gas concentration histories from multiple monitoring points, medium properties, barrier location, and the source concentration. SEAtrace trademark does not attempt to model all of the nuances associated with multi-phase, multi-component flow, but rather, the inverse code uses a simplistic forward model which can provide results which are reasonably accurate. The system has calculated leak locations to within 0.5 meters and leak radii to within 0.12 meters

  18. Copper ion as a new leakage tracer.

    Science.gov (United States)

    Modaresi, J; Baharizade, M; Shareghi, A; Ahmadi, M; Daneshkazemi, A

    2013-12-01

    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. 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. 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. 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. Based on our results, there was no significant correlation between the dye penetration and the copper ion diffusion methods.

  19. Tracer verification and monitoring of containment systems

    International Nuclear Information System (INIS)

    Lowry, W.; Dunn, S.D.; Williams, C.

    1996-01-01

    In-situ barrier emplacement techniques and materials for the containment of high-risk contaminants in soils are currently being developed by the Department of Energy (DOE). Because of their relatively high cost, the barriers are intended to be used in cases where the risk is too great to remove the contaminants, the contaminants are too difficult to remove with current technologies, or the potential for movement of the contaminants to the water table is so high that immediate action needs to be taken to reduce health risks. Consequently, barriers are primarily intended for use in high-risk sites where few viable alternatives exist to stop the movement of contaminants in the near term. Assessing the integrity of the barrier once it is emplaced, and during its anticipated life, is a very difficult but necessary requirement. Existing surface-based and borehole geophysical techniques do not provide the degree of resolution required to assure the formation of an integral in-situ barrier. Science and Engineering Associates, Inc., (SEA) and Sandia National Laboratories (SNL) are developing a quantitative subsurface barrier assessment system using gaseous tracers. Called SEAtrace trademark, this system integrates an autonomous, multipoint soil vapor sampling and analysis system with a global optimization modeling methodology to pinpoint leak sources and sizes in real time. SEAtrace trademark is applicable to impermeable barrier emplacements above the water table, providing a conservative assessment of barrier integrity after emplacement, as well as a long term integrity monitoring function. The SEAtrace trademark system is being developed under funding by the DOE-EM Subsurface Contaminant Focus Area

  20. Biogeochemical tracers of the marine cyanobacterium Trichodesmium

    Science.gov (United States)

    Carpenter, Edward J.; Harvey, H. Rodger; Fry, Brian; Capone, Douglas G.

    1997-01-01

    We examined the utility of several biogeochemical tracers for following the fate of the planktonic diazotrophic cyanobacterium Trichodesmium in the sea. The presence of a (CIO) fatty acid previously reported was observed in a culture of Trichodesmium but was not found in natural samples. This cyanobacterium had high concentrations of C 14 and C 16 acids, with lesser amounts of several saturated and unsaturated C 18 fatty acids. This composition was similar to that of other marine cyanobacteria. The major hydrocarbon identified was the C 17n-alkane, which was present in all samples from the five stations examined. Sterols common to algae and copepods were observed in many samples along with hopanoids representative of bacteria, suggesting a varied community structure in colonies collected from different stations. We found no unique taxonomic marker of Trichodesmium among the sterols. Measurements of the σ 15N and σ 13C in Trichodesmium samples from the SW Sargasso and NW Caribbean Seas averaged -0.4960 (range from -0.7 to -0.25960) and -12.9%0 (range from -15.2 to -11.9960), respectively, thus confirming previous observations that this cyanobacterial diazotroph has both the lowest σ 15N and highest σ 13C of any marine phytoplankter observed to date. A culture of Trichodesmium grown under diazotrophic conditions had a σ 15N between -1.3 and -3.6960. Our results support the supposition that the relatively low σ 15N and high σ 13C values observed in suspended and sediment-trapped material from some tropical and subtropical seas result from substantial input of C and N by Trichodesmium.

  1. Marine chemistry and tracer applications of radiocaesium

    International Nuclear Information System (INIS)

    McKay, W.A.

    1983-03-01

    The general aims of this project were to study the marine chemistry of Windscale-derived radiocaesium and to continue previous research at Glasgow University on its tracer application in Scottish waters and sediments. It was found that a considerable percentage of sediment-associated 137 Cs (approximately 12 to 50%) may be contained by carbonate, oxide and organic coatings which appear to be relatively stable under a wide range of redox conditions. Whilst the partitioning of 137 Cs is related to the concentration of these oxides, organics and, to a much lesser extent, carbonates, their function is predominantly to prevent 137 Cs release from clay mineral exchange sites. 137 Cs activities per unit sediment weight were highest in the clay fraction with its uptake by coarse sediments appearing to be controlled by clay minerals coatings formed in the marine environment and cemented partly by oxides and organics. Though the sites sampled (Clyde Sea Area (C.S.A.) and L. Etive) encompassed a wide range of sediment types, the range of estimated 137 Cs distribution coefficients (K D ) was relatively small (360 to 890). Coatings may thus have more influence on K d s in the coastal marine environment than particle size distributions. Apparent concentration factors (C F s) of X325, X2800 and X1910 were determined for the associated carbonate, oxide and organic coatings, for a site off Greenock. Use of 'dry' sediments appeared to produce considerably overestimated values for the degree of 137 Cs fixation. Thus 'wet' sediments were used in these studies. Over the 1978-1981 period, approximately 35% of Windscale output passed through the C.S.A., diluted 26 times during transit. An estimated 0.3% of this water-borne inventory was removed into the sediments. Windscale to C.S.A. transit and residence times of 4 and 12 months respectively were derived. Monitoring the deeper levels of L. Etive allowed 137 Cs to be used to trace patterns of w

  2. Stable isotopes as tracers for radionuclides

    International Nuclear Information System (INIS)

    Giussani, A.; Bartolo, D. de; Cantone, M.C.; Zilker, T.; Greim, H.; Roth, P.; Werner, E.

    2000-01-01

    The assessment of internal dose after incorporation of radionuclides requires as input data the knowledge of the uptake into the systemic circulation, the distribution and retention in selected organs, the excretion pathways. Realistic biokinetic models are needed for reliable estimates, correct interpretation of bioassay measurements, appropriate decision-making in radiological emergencies. For many radionuclides, however, the biokinetic models currently recommended are often generic, with very few specific parameters, due to the lack of experimental human data. The use of stable isotopes as tracers enables to determine important biokinetic parameters such as the fractional uptake, the clearance from the transfer compartment, the excretion patterns under experimentally controlled conditions. The subjects investigated are not exposed to any radiation risk, so this technique enables to obtain biokinetic information also for sensitive groups of the population, such as children or pregnant women, and to determine age- and gender-specific model parameters. Sophisticated analytical method, able to discriminate and quantitate different isotopes of the same element in complex matrices such as biological fluids, have to be purposely developed and optimized. Activation analysis and mass spectrometry are the most proper techniques of choice. Experiments were conducted with molybdenum, tellurium, ruthenium and zirconium. Activation analysis with protons, thermal ionization mass spectrometry and inductively coupled mass spectrometry were employed for the determination of stable isotopes of these elements in blood plasma and urine samples. Several deviations from the predictions of the ICRP models were observed. For example, modifications to the current model for molybdenum have been suggested on the basis of these results. The dose coefficients to the target regions calculated with this proposed model are even of one order of magnitude different than the ICRP estimates

  3. 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.)

  4. Integrated energy data solution for energy markets of Europe: Energy Data Warehouse; Integrierte Energiedatenloesung fuer Europas Energiemaerkte: Energy Data Warehouse

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2001-07-01

    According to Ralf Hoffmann, head of the sales department of Goerlitz Computerbau AG, integrated problem solutions for Europe's new energy markets must be developed fast, without delay and with all efforts available. [German] 'Integrierte Problemloesungen fuer Europas neue Energiemaerkte muessen schnell und investitionssicher fuer die Anwender realisiert werden. Sie dulden keinen Aufschub. Alle unternehmerische Kraft muss und wird in die Befriedigung dieser Anforderungen gelegt.' So aeussert sich der Vorstand Absatzwirtschaft der Goerlitz Computerbau AG, Ralf Hoffmann. (orig.)

  5. 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.

  6. 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

  7. Field measurements of tracer gas transport by barometric pumping

    International Nuclear Information System (INIS)

    Lagus, P.L.; McKinnis, W.B.; Hearst, J.R.; Burkhard, N.R.; Smith, C.F.

    1994-01-01

    Vertical gas motions induced by barometric pressure variations can carry radioactive gases out of the rubblized region produced by an underground nuclear explosion, through overburden rock, into the atmosphere. To better quantify transit time and amount of transport, field experiments were conducted at two sites on Pahute Mesa, Kapelli and Tierra, where radioactive gases had been earlier detected in surface cracks. At each site, two tracer gases were injected into the rubblized chimney 300-400 m beneath the surface and their arrival was monitored by concentration measurements in gas samples extracted from shallow collection holes. The first ''active'' tracer was driven by a large quantity of injected air; the second ''passive'' tracer was introduced with minimal gas drive to observe the natural transport by barometric pumping. Kapelli was injected in the fall of 1990, followed by Tierra in the fall of 1991. Data was collected at both sites through the summer of 1993. At both sites, no surface arrival of tracer was observed during the active phase of the experiment despite the injection of several million cubic feet of air, suggesting that cavity pressurization is likely to induce horizontal transport along high permeability layers rather than vertical transport to the surface. In contrast, the vertical pressure gradients associated with barometric pumping brought both tracers to the surface in comparable concentrations within three months at Kapelli, whereas 15 months elapsed before surface arrival at Tierra. At Kapelli, a quasisteady pumping regime was established, with tracer concentrations in effluent gases 1000 times smaller than concentrations thought to exist in the chimney. Tracer concentrations observed at Tierra were typically an order of magnitude smaller. Comparisons with theoretical calculations suggest that the gases are traveling through ∼1 millimeter vertical fractures spaced 2 to 4 meters apart. 6 refs., 18 figs., 3 tabs

  8. Characterization of a managed aquifer recharge system using multiple tracers.

    Science.gov (United States)

    Moeck, Christian; Radny, Dirk; Popp, Andrea; Brennwald, Matthias; Stoll, Sebastian; Auckenthaler, Adrian; Berg, Michael; Schirmer, Mario

    2017-12-31

    Knowledge about the residence times of artificially infiltrated water into an aquifer and the resulting flow paths is essential to developing groundwater-management schemes. To obtain this knowledge, a variety of tracers can be used to study residence times and gain information about subsurface processes. Although a variety of tracers exists, their interpretation can differ considerably due to subsurface heterogeneity, underlying assumptions, and sampling and analysis limitations. The current study systematically assesses information gained from seven different tracers during a pumping experiment at a site where drinking water is extracted from an aquifer close to contaminated areas and where groundwater is artificially recharged by infiltrating surface water. We demonstrate that the groundwater residence times estimated using dye and heat tracers are comparable when the thermal retardation for the heat tracer is considered. Furthermore, major ions, acesulfame, and stable isotopes (δ 2 H and δ 18 O) show that mixing of infiltrated water and groundwater coming from the regional flow path occurred and a vertical stratification of the flow system exist. Based on the concentration patterns of dissolved gases (He, Ar, Kr, N 2 , and O 2 ) and chlorinated solvents (e.g., tetrachloroethene), three temporal phases are observed in the ratio between infiltrated water and regional groundwater during the pumping experiment. Variability in this ratio is significantly related to changes in the pumping and infiltration rates. During constant pumping rates, more infiltrated water was extracted, which led to a higher dilution of the regional groundwater. An infiltration interruption caused however, the ratio to change and more regional groundwater is extracted, which led to an increase in all concentrations. The obtained results are discussed for each tracer considered and its strengths and limitations are illustrated. Overall, it is demonstrated that aquifer heterogeneity and

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

    KAUST Repository

    Subramanian, S. K.; Li, Yan; Cathles, L. M.

    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.

  10. Stable isotope tracers and exercise physiology: past, present and future.

    Science.gov (United States)

    Wilkinson, Daniel J; Brook, Matthew S; Smith, Kenneth; Atherton, Philip J

    2017-05-01

    Stable isotope tracers have been invaluable assets in physiological research for over 80 years. The application of substrate-specific stable isotope tracers has permitted exquisite insight into amino acid, fatty-acid and carbohydrate metabolic regulation (i.e. incorporation, flux, and oxidation, in a tissue-specific and whole-body fashion) in health, disease and response to acute and chronic exercise. Yet, despite many breakthroughs, there are limitations to 'substrate-specific' stable isotope tracers, which limit physiological insight, e.g. the need for intravenous infusions and restriction to short-term studies (hours) in controlled laboratory settings. In recent years significant interest has developed in alternative stable isotope tracer techniques that overcome these limitations, in particular deuterium oxide (D 2 O or heavy water). The unique properties of this tracer mean that through oral administration, the turnover and flux through a number of different substrates (muscle proteins, lipids, glucose, DNA (satellite cells)) can be monitored simultaneously and flexibly (hours/weeks/months) without the need for restrictive experimental control. This makes it uniquely suited for the study of 'real world' human exercise physiology (amongst many other applications). Moreover, using D 2 O permits evaluation of turnover of plasma and muscle proteins (e.g. dynamic proteomics) in addition to metabolomics (e.g. fluxomics) to seek molecular underpinnings, e.g. of exercise adaptation. Here, we provide insight into the role of stable isotope tracers, from substrate-specific to novel D 2 O approaches, in facilitating our understanding of metabolism. Further novel potential applications of stable isotope tracers are also discussed in the context of integration with the snowballing field of 'omic' technologies. © 2016 The Authors. The Journal of Physiology © 2016 The Physiological Society.

  11. Significance of CT analysis of regional lymph node metastases in colorectal cancer; Bedeutung der CT fuer die Beurteilung regionaerer Lymphknotenmetastasen bei kolorektalen Karzinomen

    Energy Technology Data Exchange (ETDEWEB)

    Gomille, T.; Christ, F. [Duesseldorf Univ. (Germany). Abt. fuer Radiologie und Nuklearmedizin; Aleksic, M.; Ulrich, B. [Krankenhaus Gerresheim (Germany). Chirurgische Klinik

    1998-12-01

    Purpose: For preoperative staging of colorectal cancer a CT scan is frequently performed. This report examines the sensitivity of CT for regional lymph node metastasis of colorectal cancer using different criteria. Materials and methods: Preoperative CT scans of 153 patients with colorectal cancer were analyzed using different criteria for N1. The results were then compared to the postoperative histological findings. Results: For N1=lymph nodes (LN)>1 cm the sensitivity was 47%. For N1=LN>1 cm or an increased number of LN<1 cm the sensitivity was 71%. In patients with a primary tumor seen on CT, sensitivity rose to 87%. Discussion: Evidence of regional nodal metastatic disease is only relevant for rectal cancer, colon polyps, and for locally excised tumors when considering present surgical concepts for the treatment of colorectal cancer. In these cases CT analysis using the broadened criteria for N1 proposes a valuable argument regarding possible preoperative radiotherapy or an operative revision. (orig.) [Deutsch] Die Sensitivitaet fuer den Nachweis regionaerer Lymphknotenmetastasen kolorektaler Karzinome wurde unter Anwendung verschiedener Kriterien fuer das N1-Stadium an Patienten mit histologisch gesichertem Lymphknotenbefund untersucht. Fuer das Kriterium N1=Lymphknoten (LK)>1 cm betrug die Sensitivitaet 47%. Fuer N1=LK>1 cm/vermehrte Anzahl LK<1 cm war sie 71%, bei erkennbarem Primaertumor sogar 87%. Unter Beruecksichtigung der derzeit geltenden operativen Therapiekonzepte ist der Nachweis von regionaeren Lymphknotenmetastasen nur bei Rektumkarzinom bzw. fuer Kolonpolypen oder fuer lokal exzidierte Karzinome fuer das therapeutische Vorgehen relevant. In diesen Faellen leistet die CT mit den erweiterten Kriterien fuer ein N1-Stadium trotz hoeherer falsch-positiver Raten eine wertvolle Hilfestellung fuer die Entscheidung ueber eine neoadjuvante Bestrahlung oder eine Nachresektion. (orig.)

  12. 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 Ableitung von Pruef

  13. 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

  14. Introductory strategies for the automation of suburban railway systems; Einfuehrungsstrategien fuer die Automatisierung von Nahverkehrsbahnen

    Energy Technology Data Exchange (ETDEWEB)

    Ritter, N. [Siemens Transportation Systems, Berlin (Germany)

    2001-04-01

    Driverless automatic operation is a cost-effective and passenger-friendly form of handling services in suburban railway systems. It is intended to introduce this operating mode also in railway systems that have so far been operated in a conventional mode. The article outlines solution concepts and introductory strategies for changing the operating mode. (orig.) [German] Der fahrerlose automatische Betrieb stellt eine wirtschaftliche und fahrgastfreundliche Form der Betriebsabwicklung von Nahverkehrssystemen dar. Ziel ist es, diese Betriebsform auch bei bislang konventionell betriebenen Bahnen einzufuehren. Der vorliegende Beitrag zeigt Loesungsansaetze und Einfuehrungsstrategien fuer die Umstellung auf einen automatischen Betrieb. (orig.)

  15. Single room control for user-optimised room air conditions; Einzelraumregelung fuer nutzungsoptimiertes Raumklima

    Energy Technology Data Exchange (ETDEWEB)

    Lezius, A. [Staefa Control System GmbH, Leinfelden-Echterdingen (Germany)

    1995-12-31

    In chapter 14 of the anthology about building control the single room control for achieving user-optimised room air conditions is described. The following aspects are discussed: What is comfort? What is economic efficiency? Systems for secondary air treatment, adapted functions of the measurement and control technique, management functions, orientation of the demand at the use, investment and amortisation. (BWI) [Deutsch] Kapitel 14 des Sammelbandes ueber Building control ist dem Thema der Einzelraumregelung zur Erzielung eines nutzungsoptimierten Raumklimas gewidmet. In diesem Zusammenhang werden folgende Themenbereiche angesprochen: Was ist Komfort? Was ist Wirtschaftlichkeit? Systeme fuer sekundaere Luftbehandlung; Angepasste Funktionen der MSR-Technik; Managementfunktionen; Bedarfsorientierung an der Nutzung; Investition und Amortisation. (BWI)

  16. Measurement of Kr-85 and Xe-133 as undisturbed tracers for the representing of atmospheric transport after disposal of radioactivity from nuclear facilities

    International Nuclear Information System (INIS)

    Frank, G.; Steinkopff, T.; Salvamoser, J.

    2016-01-01

    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.

  17. 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.)

  18. 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.

  19. Testing of corrosion resistant materials for evaporation plants for waste water from wet scrubbing of flue gas from power plants; Erprobung korrosionsbestaendiger Werkstoffe fuer Eindampfanlagen fuer Abwasser aus der Rauchgasreinigung von Grossfeuerungsanlagen

    Energy Technology Data Exchange (ETDEWEB)

    Riedel, G. [Institut fuer Korrosionsschutz GmbH, Dresden (Germany); Stenner, F.; Brill, U. [Krupp-VDM GmbH, Werdohl (Germany)

    2001-07-01

    High alloyed superaustenitic steels and NiCrMo alloys are recommended in consequence of the results of extensive laboratory corrosion experiments under the strong corrosive conditions with up to 360 g chloride content at temperatures up to 85 C. Because results of laboratory corrosion tests are only of limited relevance to the behaviour in practice, field tests were carried out with immersion of welded materials and of heat exchanger tubes under operating conditions of an evaporation plant for waste water from flue gas desulphurization of a coal-fired power plant. Different kinds of high alloy superaustenitic steels and NiCrMo alloys were studied as TIG-welded specimens in immersion tests. (orig.) [German] Hochlegierte Sonderedelstaehle und NiCrMo-Legierungen empfehlen sich aufgrund der Ergebnisse umfassender Laboruntersuchungen unter den stark korrosiven Bedingungen fuer Eindampfanlagen fuer Abwasser aus der Nassreinigung von Rauchgasen von Grossfeuerungsanlagen mit bis zu 360 g/l Chloridgehalt und Temperaturen bis zu 85 C. Weil aber Ergebnisse von Laborpruefungen nur begrenzte Aussagefaehigkeit fuer das Verhalten unter Praxisbedingungen haben, wurden Feldversuche mit der Auslagerung geschweisster Werkstoffe und von Waermetauscherrohren unter Betriebsbedingungen einer Eindampfanlage fuer Abwasser aus der Rauchgasentschwefelung eines kohlebefeuerten Kraftwerks durchgefuehrt. (orig.)

  20. 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

  1. Analysis of infiltration through mill tailings using a bromide tracer

    International Nuclear Information System (INIS)

    Lewis, G.J.; Stephens, D.B.

    1985-01-01

    Infiltration of precipitation into tailings impoundments as a means of recharge to underlying materials is often considered insignificant, particularly in arid and semi-arid environments. A series of experiments was performed to investigate the behavior of infiltrated precipitation into tailing soils, by the use of a bromide tracer. A bromide tracer was applied to the surface of columns driven into the tailings to monitor downward advancement of tracer-laden water. Controlled laboratory experiments on the behavior of the bromide tracer under varying precipitation events and initial soil moisture contents were also conducted. Results indicate that a definite downward migration of infiltrated precipitation occurs, particularly with large magnitude precipitation events, and that, eventually, some fraction of the infiltrated precipitation may continue downward below the zone affected by evaporation. The use of an artificially applied bromide tracer to monitor depth of infiltration of precipitation is a simple, safe technique that can provide valuable information for long-term tailings management strategies at low cost

  2. 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)

  3. Spectral analysis for evaluation of myocardial tracers for medical imaging

    International Nuclear Information System (INIS)

    Huesman, Ronald H.; Reutter, Bryan W.; Marshall, Robert C.

    2000-01-01

    Kinetic analysis of dynamic tracer data is performed with the goal of evaluating myocardial radiotracers for cardiac nuclear medicine imaging. Data from experiments utilizing the isolated rabbit heart model are acquired by sampling the venous blood after introduction of a tracer of interest and a reference tracer. We have taken the approach that the kinetics are properly characterized by an impulse response function which describes the difference between the reference molecule (which does not leave the vasculature) and the molecule of interest which is transported across the capillary boundary and is made available to the cell. Using this formalism we can model the appearance of the tracer of interest in the venous output of the heart as a convolution of the appearance of the reference tracer with the impulse response. In this work we parameterize the impulse response function as the sum of a large number of exponential functions whose predetermined decay constants form a spectrum, and each is required only to have a nonnegative coefficient. This approach, called spectral analysis, has the advantage that it allows conventional compartmental analysis without prior knowledge of the number of compartments which the physiology may require or which the data will support

  4. Analysis of some laboratory tracer runs in natural fissures

    International Nuclear Information System (INIS)

    Moreno, L.; Neretnieks, I.

    1984-01-01

    Tracer tests in natural fissures performed in the laboratory are analysed by means of fitting two different models. In the experiments, sorbing and non-sorbing tracers were injected into a natural fissure running parallel to the axis of a drill core. The models take into account advection, diffusion into the rock matrix, sorption onto the rock surface and dispersion. For the last mechanism, one of the models considers hydrodynamic dispersion while the other model assumes channeling dispersion. The models take into account time delays in the inlet and outlet channels. The dispersion characteristics and water residence time were determined from the experiments with non-sorbing tracers. Surface and volume sorption coefficients and data on diffusion into the rock matrix were determined for the sorbing tracers. The results are compared with values independently determined in the laboratory. Good agreement was obtained using either model. When these models are used for prediction of tracer transport over larger distances, the results will depend on the model. The model with channeling dispersion will show a greater dispersion than the model with hydrodynamic dispersion. (author)

  5. Nestle favours NH{sub 3} and CO{sub 2} for refrigeration. Conversion of a deep freeze store from R13 B1 to natural refrigerants; Nestle setzt auf NH{sub 3} und den Kaeltetraeger CO{sub 2}. Umruestung der Kaelteversorgung eines Grosstiefkuehllagers vom FCKW R 13 B1 auf natuerliche Kaeltemittel

    Energy Technology Data Exchange (ETDEWEB)

    Gebhardt, H. [Nestec Ltd., Vevey (Switzerland)

    2001-11-01

    The freeze store of the Nestle company were converted from CFC refrigerants to natural refrigerants, i.e. NH{sub 3} and CO{sub 2}. [German] Der Ausstieg aus den sogennanten Sicherheitskaeltemitteln aufgrund ihres Ozongefaehrdungs- bzw. Treibhauspotentials stellt viele Grosskaelteabnehmer vor die Frage der Alternative. Hiervon betroffen ist auch der weltweit taetige Nestle-Konzern, denn zahlreiche Prozesse sind auf die Kaeltetechnik angewiesen. Auf der Suche nach technischen Loesungen hat Nestle einen eigenen Kurs eingeschlagen, indem neben dem Kaeltemittel NH{sub 3} auch CO{sub 2} als Kaeltetraeger eingesetzt wird. Dies mit vielversprechenden Ergebnissen, die auch Argumente fuer den Einsatz von NH{sub 3}/CO{sub 2} in anderen Bereichen der Kaeltetechnik liefern. (orig.)

  6. A comparison of three different types of collectors for process heat uses; Vergleich von drei verschiedenen Kollektortypen fuer Prozesswaermeanwendungen

    Energy Technology Data Exchange (ETDEWEB)

    Brunold, S. [Solarenergie Pruef- und Forschungsstelle SPF-ITR, Rapperswil (Switzerland); Frey, R. [Solarenergie Pruef- und Forschungsstelle SPF-ITR, Rapperswil (Switzerland); Frei, U. [Solarenergie Pruef- und Forschungsstelle SPF-ITR, Rapperswil (Switzerland)

    1995-12-31

    A comparison of the measured and simulated values of three collector types shows that evacuated tube collectors are superior to transparent-insulation flat collectors in the case of high-temperature uses. At temperatures of 150 C and above good results were obtained using evacuated tube collectors with compound parabolic concentrators manufactured by Microtherm. CORTEC collectors are suited for temperatures in the range of 100 C to 150 C provided that the surface ratio is irrelevant. Costs play a decisive role when selecting systems. The results obtained show that improved transparent-insulation flat collectors can compete with evacuated tube collectors in the 100 C to 150 C temperature range. (orig.) [Deutsch] Ein Vergleich der gemessenen und simulierten Werte der drei Kollektoren zeigt, dass die Vakuumroehrenkollektoren fuer den Einsatz in Hochtemperaturanwendungen dem mit transparenter Waermedaemmung isolierten Flachkollektor ueberlegen sind. Der Vakuumroehrenkollektor mit CPC von Microtherm erzielt gute Resultate ab 150 C und mehr. Wogegen der CORTEC-Kollektor fuer den Einsatz im Temperaturbereich zwischen 100 C und 150 C geeignet ist, solange das Flaechenverhaeltnis keine Rolle spielt. Wie fuer die meisten Anwendungen spielen die Kosten eine entscheidende Rolle fuer die Wahl des eingesetzten Systems. Die Resultate zeigen, dass ein verbesserter mit TWD ausgeruesteter Flachkollektor im Temperaturbereich von 100 C bis 150 C konkurrenzfaehig zu Vakuumroehrenkollektoren sein kann. (orig.)

  7. 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.

  8. 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.

  9. Kernforschungszentrum Karlsruhe. Institut fuer Datenverarbeitung in der Technik: Progress report on research and development works in 1984

    International Nuclear Information System (INIS)

    1985-02-01

    The Institut fuer Datenverarbeitung in der Technik (Institute for Data Processing in Engineering) works in the field of applied computer and systems analysis. The present report describes the activities of this Institute within the following KfK-projects: Reprocessing, Fusion Technology, Nuclear Material Safeguards, Nuclear Safety, and the Fast Breeder Project. (WB) [de

  10. How to promote solar power. Strategic application of consumer and environmental psychology; Fuer Solarenergie. Konsumenten- und Umweltpsychologie strategisch anwenden

    Energy Technology Data Exchange (ETDEWEB)

    Huebner, G. [Halle Univ. (Germany). Lehrstuhl fuer Sozial- und Organisationspsychologie; Felser, G. [Halle Univ. (Germany). Lehrstuhl fuer Differentielle Psychologie und Psychologische Diagnostik

    2001-07-01

    Why are solar systems still so few and far between? The book presents answers based on a systematic analysis of the psychological aspects of the decision, e.g. consumer needs and motives. 'Social Marketing' is presented as a differentiated outline concept for developing strategies for selling solar power. The book addresses solar and agenda initiatives, environmental organisations, communities and energy-minded citizens as well as students of environmental science and psychology. [German] Warum sind Solaranlagen noch immer so selten? Antworten auf diese Frage finden sich im Buch, in dem aus Sicht der Konsumenten- und Umweltpsychologie die psychologischen Facetten der Entscheidung fuer Solarenergie, z.B. - die Beduerfnisse und Motive der Konsumenten von Solaranlagen - die Wirkungen von Informationsmaterial auf die Kaufentscheidung, erstmals systematisch analysiert werden. Mit dem 'Sozialen Marketing' wird ein differenziertes Rahmenkonzept fuer die Gestaltung von Strategien fuer Solarenergie vorgestellt. Dieses Buch ist vor allem hilfreich fuer Solar- und Agendainitiativen, Umweltverbaende, Kommunen und energiebewusste Buerger, da es praxisnahe Informationen und Handlungsempfehlungen vermittelt. Es wendet sich aber auch an Studierende der Umweltwissenschaften und der Psychologie. Es bereichert die Diskussion ueber Solarenergie mit Argumenten, die der Komplexitaet des Themas Rechnung tragen. (orig.)

  11. Driver assistance - Firstly a contribution to primary safety or rather to comfort?; Fahrerassistenz primaer zum Komfort oder fuer die Sicherheit?

    Energy Technology Data Exchange (ETDEWEB)

    Bubb, H. [TU Muenchen, Garching (Germany). Lehrstuhl fuer Ergonomie

    2003-07-01

    Doubtless assistance systems should contribute to the safety of car driving. They support simultaneously a comfortable use of the car. Especially the operation comfort is characterised by clarity, self explaining, robustness against errors, and so on. Operation comfort doesn't give an inessential contribution to a reliable and appropriate interaction between driver and vehicle that means also a contribution to a reliable function of the total system and thereby to safety. Therefore the subjective experience of assistance systems is of excellent importance with view on the subjective and public confidence in new assistance systems. Are they seen rather as a gain of comfort, as it is preferred by the producer by reasons of production related liability, or as an easing of the driver's behaviour providing safety? Consists in the last called tendency a new kind of danger? In this connection juristic problems may not be unmentioned. The driver may not or not completely be called to account for procedures on which he has no influence or thinks to have no influence. In this case the account for the not compensated damage is contributed to the producer of the system. Therefore, by considering human characteristics and abilities of the driver during the development of assistance systems unwanted juristic consequences should be prevented. (orig.) [German] Assitenzsysteme sollen zweifellos einen Beitrag fuer die Sicherheit des Autofahrers liefern. Zugleich dienen sie aber auch fuer eine komfortable Nutzung des Fahrzeugs. Speziell der Bedienkomfort ist durch leichte Verstaendlichkeit, Selbsterklaerbarkeit, Fehlerrobustheit u.ae. charakterisiert. Durch ihn wird ein nicht unwesentlicher Beitrag zur sicheren und zweckdienlichen Interaktion zwischen Fahrer und Fahrzeug geleistet, also auch ein Beitrag fuer die zuverlaessige Funktion des Systems und damit fuer die Sicherheit. Von herausragender Bedeutung insbesondere im Hinblick auf das subjektive und das oeffentliche

  12. Natural stream flow-rates measurements by tracer techniques

    International Nuclear Information System (INIS)

    Cuellar Mansilla, J.

    1982-01-01

    This paper presents the study of the precision obtained measuring the natural stream flow rates by tracer techniques, especially when the system presents a great slope and a bed constituted by large and extended particle size. The experiences were realized in laboratory pilot channels with flow-rates between 15 and 130 [1/s]; and in natural streams with flow-rates from 1 to 25 m 3 /s. Tracer used were In-133m and Br-82 for laboratory and field measurements respectively. In both cases the tracer was injected as a pulse and its dilution measured collecting samples in the measured section, at constant flow-rates, of 5[1] in laboratory experiences and 60[1] of water in field experiences. Precisions obtained at a 95% confidence level were about 2% for laboratory and 3% for field. (I.V.)

  13. Collective and tracer diffusion kinetics in the ternary random alloy

    International Nuclear Information System (INIS)

    Belova, I.V.; Murch, G.E.; Allnatt, A.R.

    2002-01-01

    In this study, collective and tracer diffusion kinetics is addressed for the ternary random alloy. A formal solution from the self-consistent theory of Moleko et al (Moleko L K, Allnatt A R and Allnatt E L 1989 Phil. Mag. A 59 141) is derived for collective diffusion and compared with the corresponding solution for the binary random alloy. Tracer diffusion in the ternary alloy is treated from the perspective of a special case of the quaternary random alloy. Results from Monte Carlo calculations for tracer and collective correlation factors (for the bcc ternary random alloy) are found to be in excellent agreement with this self-consistent theory but in only semi-quantitative agreement with the earlier theory of Manning (Manning J R 1971 Phys. Rev. B 4 1111). (author)

  14. Concentration dynamics in lakes and reservoirs. Studies using radioactive tracers

    International Nuclear Information System (INIS)

    Gilath, Ch.

    1983-01-01

    The use of radioactive tracers for the investigation of concentration dynamics of inert soluble matter in lakes and reservoirs is reviewed. Shallow and deep stratified lakes are considered. The mechanism of mixing in lakes, flow pattern and input - output response are discussed. The methodology of the use of radioactive tracers for concentration dynamic studies is described. Examples of various investigations are reviewed. The dynamics of shallow lakes can be found and expressed in terms of transfer functions, axial dispersion models, residence time distributions and sometimes only semiquantitative information about the flow pattern. The dynamics of deep, stratified lakes is more complex and difficult to investigate with tracers. Flow pattern, horizontal and vertical eddy diffusivities, mass transfer between the hypolimnion and epilimnion are tools used for describing this dynamics. (author)

  15. Application of artificial radioactive tracers for groundwater flow

    International Nuclear Information System (INIS)

    Hamza, M.S.; Aly, A.I.M.; Swailem, F.M.; Nada, A.A.; Awad, M.A.

    1989-01-01

    In this work, the groundwater velocity was estimated by applying radioactive tracer techniques: the single well and the multiple well methods. In the first single well method, radioactive iodine-131 was injected in the well and the radioactivity was monitored with time. The groundwater flow was estimated as a function of the concentration dilution factor of the tracer taking into consideration the permeability of the filter screen and the aquifer. The second method (the multiple well technique) is based on direct measuring of the period of time the tracer needs to disperse from the injection well to one of receptor well arranged in a circle around the injection. The latter method was found to be more accurate and reliable and has also the advantage of determining the groundwater velocity and direction of flow as well. The limitations of the single well technique are discussed and a detailed comparison between single and multi-well techniques is given

  16. Live controls for radioisotope tracer food chain experiments using meiofauna

    International Nuclear Information System (INIS)

    Montagna, P.A.

    1983-01-01

    Formalin poisoned samples are inadequate for measuring the amount of label to be subtracted as control values for certain food chain studies that employ radioactive tracers. In some studies, tracer is added just before incubation to label ''food'' during the feeding study. Commonly, parallel, poisoned incubations are used to distinguish between biotic and abiotic label incorporation. But, a poisoned control does not account for label that could enter a consumer via active transport, epicuticular microfloral uptake, or grazing on labeled, non-food particles. Experiments were performed to test if label uptake is greater in live non-grazing than dead organisms. Marine benthic meiofauna incoporate from 3 to 133 times more tracer when they are alive and not grazing than when they are formalin killed. These results suggest that control experiments with live animals be performed to measure all processes by which label can enter consumers in food chain experiments. (orig.)

  17. Holdup time measurement by radioactive tracers in pulp production

    International Nuclear Information System (INIS)

    Roetzer, H.; Donhoffer, D.

    1988-12-01

    A batch of pulp was to be labelled before passing two bleaching towers of a pulp plant. Activated glass fibres were used as a tracer, which contained 24-Na with a half-life of 15 hours. It was shown in laboratory tests, that the glass fibres were suitable for transport studies of wood pulp. For use in the tests the fibres were activated and suspended in water. Due to the small diameter of the fibres (2-5 micrometers) this suspension shows physical properties very similar to the pulp. For detection six scintillation probes were mounted at different positions outside the bleaching tower. Radiation protection during the test was very easy due to the low total activity of the tracer material. Residence time distributions for both towers were measured. The successful tracer experiments show, that the method of labelling is suited for investigations of material transport in the pulp and paper industry. 3 figs., 11 refs., 2 tabs. (Author)

  18. 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

    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...... into account a number of individual compartments. The signal dephasing is simulated in a semianalytical way by embedding Monte Carlo simulations in the framework of analytical theory. This approach yields a tool for fast, realistic simulation of the change in the transverse relaxation. The results indicate...... 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...

  19. Contamination tracer testing with seabed drills: IODP Expedition 357

    Directory of Open Access Journals (Sweden)

    B. N. Orcutt

    2017-11-01

    Full Text Available IODP Expedition 357 utilized seabed drills for the first time in the history of the ocean drilling program, with the aim of collecting intact sequences of shallow mantle core from the Atlantis Massif to examine serpentinization processes and the deep biosphere. This novel drilling approach required the development of a new remote seafloor system for delivering synthetic tracers during drilling to assess for possible sample contamination. Here, we describe this new tracer delivery system, assess the performance of the system during the expedition, provide an overview of the quality of the core samples collected for deep biosphere investigations based on tracer concentrations, and make recommendations for future applications of the system.

  20. Life cycle assessment of different disposal routes of sewage sludge; Oekobilanz verschiedener Entsorgungsmoeglichkeiten fuer Klaerschlamm

    Energy Technology Data Exchange (ETDEWEB)

    Chassot, G.M.; Candinas, T. [Eidgenoessische Forschungsanstalt fuer Agraroekologie und Landbau (FAL), Inst. fuer Umweltschutz und Landwirtschaft IUL Liebefeld, Bern (Switzerland)

    1998-11-01

    The ecological impact of six different disposal routes for sewage sludge of a major sewage treatment plant (three options for agricultural use in liquid, dried and limetreated form, and three options of incineration in a mono-sewage sludge incineration plant, a cement factory and a `Schwel-Brenn` type incinerator for municipal solid waste) has been studied with an comprehensive inventory and five impact assessment methods. Three methods show the important role of soil pollution. Existing methods are not yet able to consider all the factors necessary. The inventories should be completed concerning natural phosphorus resources and organic micropollutants. (orig.) [Deutsch] Sechs Entsorgungsvarianten (drei betreffen die landwirtschaftliche Verwendung in fluessiger, thermisch getrockneter und gekalkter Form und drei die Verbrennung in einer Schlammverbrennungsanlage, einem Zementofen und einer Schwel-Brenn-Anlage fuer Kehricht) fuer den Klaerschlamm einer grossen ARA werden mittels Inventarisierung der verursachten Umweltbelastung und fuenf Bewertungsmethoden untersucht. Drei Methoden zeigen die wichtige Rolle der Bodenbelastung. Die verfuegbaren Methoden koennen aber wichtige Einflussgroessen noch nicht beruecksichtigen. Ferner sollten die Inventare bezueglich P-Ressourcen und organischen Schadstoffen vervollstaendigt werden. (orig.)

  1. Modern recording systems for services able to meet the competition; Moderne Erfassungssysteme fuer wettbewerbsfaehige Dienstleistungen

    Energy Technology Data Exchange (ETDEWEB)

    Drumm, M.

    2000-07-01

    Modern recording systems form the basis for competitive services. They are, however, only successful when integrated precisely into a lean running organization. By means of practical examples the necessity to place great emphasis on the costs of a system besides the investment costs when deciding about a recording system, will be examined. The significant changes on the energy market and the increasing demand of the housing economy for a comprehensive offer of services from the supply industry are main initiators for a whole new line of businesses on the supply economy sector. The great challenge for the supply industry lies in the task to install lean and effective system which are on one hand reliable and easy to handle for the whole duration of the contract and on the other hand are so cost efficient, that an adequate profitability can be ensured (see also: 'The secret winners', Zfk October 1999). A decisive factor for this reason is the metering technology, which has to ensure for the whole duration of the contract that correct consumption values are registered, on the basis of which as fast and punctual as possible a legally safe invoicing can be prepared. (orig.) [German] Moderne Erfassungssysteme bilden die Grundlage fuer wettbewerbsfaehige Dienstleistungen, die jedoch erst bei sauberer Einbindung in eine schlanke Ablauforganisation erfolgreich sind. Anhand von Praxisbeispielen wird die Notwendigkeit betrachtet, bei der Entscheidung fuer ein Erfassungssystem neben den Investitionskosten den Systemkosten entscheidendes Gewicht zu verleihen. (orig.)

  2. Results report on research and development work 1980 of the Institut fuer Nukleare Entsorgungstechnik

    International Nuclear Information System (INIS)

    1981-02-01

    The Institut fuer Nukleare Entsorgungstechnik performs research and development work on the treatment, solidification and final storage of radioactive wastes. The main target of the work is to develop processes and concepts for a safe disposal of radioactive wastes from nuclear plants. The work on waste treatment is carried out within the framework of the reprocessing and waste treatment project. It comprises of the development and characterization of ultimate storable waste products as well as the development of processes for the treatment and solidification of radioactive wastes mainly from reprocessing irradiated nuclear fuels. The studies on the ultimate storage are carried out together with the 'Gesellschaft fuer Strahlen- und Umweltforschung'. Their main concern is the analysis of processes in the neighbourhood of ultimate storage (waste product, packing, filling and immediate surrounding storage medium) for normal and accident conditions and their safety technical optimization. The report is supplemented by a list of publications and lectures of the institute coworkers in 1980. (orig./RB) [de

  3. 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)

  4. PM-materials for hot working tools; PM-Werkstoffe fuer warmgehende Werkzeuge

    Energy Technology Data Exchange (ETDEWEB)

    Berns, H.; Broeckmann, C.; Theisen, W. [Bochum Univ. (Germany). Fakultaet fuer Maschinenbau; Wewers, B.

    2001-05-01

    Tools and wear parts for compacting tools are subjected to high abrasive wear and mechanical loading at elevated temperatures. MMC's based in iron- or nickel with hard particles are developed and investigated. The materials were manufactured from powders by hot isostatic pressing (HIP) and subsequently heat treated. Diffusion between hard phases and metal matrix brings about certain micro structures which were tested with respect to the resistance against sliding abrasion at room and elevated temperatures. Three-point bending tests and thermal cycling of the material was utilized to characterise the mechanical behaviour. Based on this results a toolkit for a roller press for briquetting was produced and brought into application. (orig.) [German] Werkzeuge und Verschleissteile fuer die Verarbeitung von mineralischen Guetern bei erhoehter Temperatur unterliegen sowohl hohem abrasivem Verschleiss als auch hohen mechanischen Lasten. Es werden hartphasenhaltige Verbundwerkstoffe auf Eisen- und Nickelbasis entwickelt und untersucht. Die Fertigung dieser MMC's erfolgt durch heiss isostatisches Pressen (HIP) und anschliessende Waermebehandlung. Durch Diffusion zwischen Hartphasen und Metallmatrix entstehen Gefuege, die bezueglich ihres Widerstandes gegen Abrasivverschleiss bei Raumtemperatur und gegen Korngleitverschliess bei erhoehter Temperatur geprueft werden. Zur Charakterisierung der mechanischen Eigeschaften werden Dreipunktbiegeversuche und thermsiche Ermuedungsversuche durchgefuehrt. Die gewonnenen Erkenntnisse werden genutzt, um einen Werkzeugsatz fuer eine Brikettierpresse herzustellen und in Einsatz zu bringen. (orig.)

  5. 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.

  6. 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.

  7. 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.)

  8. 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.

  9. 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.

  10. MESYST, Simulation of 3-D Tracer Dispersion in Atmosphere

    International Nuclear Information System (INIS)

    Mastrangelo, V.; Mehilli, I.

    2000-01-01

    1 - Description of program or function: Mesyst code is used for the simulation of 3D tracer dispersion in atmosphere. Three packages are part of this system: Cre-topo: prepares the terrain data for the Mesyst. Noabl: code calculates three- dimensional free divergence wind fields over complex terrain. Pas: Computing of tracer concentrations and depositions on a given domain. 2 - Method of solution: NOABL - Line Over Relaxation + Special adaptation of Gauss procedure. PAS - Monte Carlo Method. 3 - Restrictions on the complexity of the problem: Computations: Mesh size: variable from some meters to some hundreds meters Mesh number: variable depending on available real data (some hundreds points on each directions)

  11. Key aspects of stratospheric tracer modeling using assimilated winds

    Directory of Open Access Journals (Sweden)

    B. Bregman

    2006-01-01

    Full Text Available This study describes key aspects of global chemistry-transport models and their impact on stratospheric tracer transport. We concentrate on global models that use assimilated winds from numerical weather predictions, but the results also apply to tracer transport in general circulation models. We examined grid resolution, numerical diffusion, air parcel dispersion, the wind or mass flux update frequency, and time interpolation. The evaluation is performed with assimilated meteorology from the "operational analyses or operational data" (OD from the European Centre for Medium-Range Weather Forecasts (ECMWF. We also show the effect of the mass flux update frequency using the ECMWF 40-year re-analyses (ERA40. We applied the three-dimensional chemistry-transport Tracer Model version 5 (TM5 and a trajectory model and performed several diagnoses focusing on different transport regimes. Covering different time and spatial scales, we examined (1 polar vortex dynamics during the Arctic winter, (2 the large-scale stratospheric meridional circulation, and (3 air parcel dispersion in the tropical lower stratosphere. Tracer distributions inside the Arctic polar vortex show considerably worse agreement with observations when the model grid resolution in the polar region is reduced to avoid numerical instability. The results are sensitive to the diffusivity of the advection. Nevertheless, the use of a computational cheaper but diffusive advection scheme is feasible for tracer transport when the horizontal grid resolution is equal or smaller than 1 degree. The use of time interpolated winds improves the tracer distributions, particularly in the middle and upper stratosphere. Considerable improvement is found both in the large-scale tracer distribution and in the polar regions when the update frequency of the assimilated winds is increased from 6 to 3 h. It considerably reduces the vertical dispersion of air parcels in the tropical lower stratosphere. Strong

  12. Lumped parameter models for the interpretation of environmental tracer data

    International Nuclear Information System (INIS)

    Maloszewski, P.; Zuber, A.

    1996-01-01

    Principles of the lumped-parameter approach to the interpretation of environmental tracer data are given. The following models are considered: the piston flow model (PFM), exponential flow model (EM), linear model (LM), combined piston flow and exponential flow model (EPM), combined linear flow and piston flow model (LPM), and dispersion model (DM). The applicability of these models for the interpretation of different tracer data is discussed for a steady state flow approximation. Case studies are given to exemplify the applicability of the lumped-parameter approach. Description of a user-friendly computer program is given. (author). 68 refs, 25 figs, 4 tabs

  13. Interpretation of the tracer testing conducted in the Leuggern borehole

    International Nuclear Information System (INIS)

    McNeish, J.A.; Andrews, R.W.; Vomvoris, S.

    1990-12-01

    Tracer testing was conducted in the Leuggern borehole from July to December 1988 to evaluate the hydraulic properties of the crystalline host rock. The tested interval was an approximately 50 m section of fractured crystalline rock at a depth of greater than 1,600 m. The testing consisted of three tracer injection/recovery periods (uranin - 44 days, eosin - 30 days, and naphtionat -14 days), which utilized tracer injection/circulation rates, ranging between 25 and 50 ml/min. During these testing periods, tracer was injected in either of two 1/4 flow lines ported at the top or bottom of the interval and recovered from the other. Following the three tracer injection periods, a natural outflow tracer recovery test was conducted from the central tubing at an average outflow of 12 l/min. The central tubing was ported near the center of the test interval. Data collected during the testing periods included: continuous monitoring of fluid temperature, injection pressure, and electrical conductivity as well as discrete measurement of flow rates, electrical conductivity, fluid temperature, and tracer concentration. Testing results indicate a downward vertical flow of approximately 195-225 ml/min in the isolated interval, from an upper fracture inflow zone to a lower fracture outflow zone. Through analysis of the dilution levels of uranin and eosin during the injection/recovery periods, and review of field data, the top of the upper inflow zone was determined to be approximately 13 m below the top flow line and the bottom of the outflow zone to be approximately 3 to 5 meters above the bottom flow line. The calculated transmissivity value of 6E-05 m 2 /s from observed outflow rate and pressure recovery data, is consistent with results derived from previous hydraulic packer testing in the interval. The effective porosity was determined to be 0.1. Dispersion coefficient values ranged from 1.0 m to 5.0 m. The lateral hydraulic gradient value calculated from tracer recovery

  14. Lumped parameter models for the interpretation of environmental tracer data

    Energy Technology Data Exchange (ETDEWEB)

    Maloszewski, P [GSF-Inst. for Hydrology, Oberschleissheim (Germany); Zuber, A [Institute of Nuclear Physics, Cracow (Poland)

    1996-10-01

    Principles of the lumped-parameter approach to the interpretation of environmental tracer data are given. The following models are considered: the piston flow model (PFM), exponential flow model (EM), linear model (LM), combined piston flow and exponential flow model (EPM), combined linear flow and piston flow model (LPM), and dispersion model (DM). The applicability of these models for the interpretation of different tracer data is discussed for a steady state flow approximation. Case studies are given to exemplify the applicability of the lumped-parameter approach. Description of a user-friendly computer program is given. (author). 68 refs, 25 figs, 4 tabs.

  15. Use of radioactive tracers in the semiconductor industry

    International Nuclear Information System (INIS)

    Akerman, Karol

    1975-01-01

    Manufacture of the semiconductor materials comprises production and purification of the raw materials (GeC14 or SiHC13), purification of the elemental semiconductors by metallurgical methods (including zone melting), production and doping of single crystals, dividing the crystals into slices of suitable size, formation of p-n junctions and fabrication of the finished semiconductor devices. In the sequence of operations, the behavior of very small quantities of an element must be monitored, and radioactive tracers are often used to solve these problems. Examples are given of the use of radioactive tracers in the semiconductor industry

  16. Tracer techniques for determination of groundwater flow parameters

    International Nuclear Information System (INIS)

    Drost, W.; Klotz, D.

    1988-05-01

    The most common one-borehole and multiple borehole methods using tracers for the direct determination of the groundwater flow parameters (velocity of flow, flow direction) and for the indirect determination of characteristic quantities of the aquifer (effective porosity, dispersivity, transmissivity) are presented methodically and their value is documented by practical examples. Especially, the properties of and measuring technique with suitable tracers are considered (e.g. T, Na-24, Cr-51, Co-58, Co-60, Br-82, Tc-99, I-125, I-131, Au-198). (orig./HP) [de

  17. A model for C-14 tracer evaporative rate analysis (ERA)

    International Nuclear Information System (INIS)

    Gardner, R.P.; Verghese, K.

    1993-01-01

    A simple model has been derived and tested for the C-14 tracer evaporative rate analysis (ERA) method. It allows the accurate determination of the evaporative rate coefficient of the C-14 tracer detector in the presence of variable evaporation rates of the detector solvent and variable background counting rates. The evaporation rate coefficient should be the most fundamental parameter available in this analysis method and, therefore, its measurements with the proposed model should allow the most direct correlations to be made with the system properties of interest such as surface cleanliness. (author)

  18. Interwell tracer analyses of a hydraulically fractured granitic geothermal reservoir

    International Nuclear Information System (INIS)

    Tester, J.W.; Potter, R.M.; Bivins, R.L.

    1979-01-01

    Field experiments using fluorescent dye and radioactive tracers (Br 82 and I 131 ) have been employed to characterize a hot, low-matrix permeability, hydraulically-fractured granitic reservoir at depths of 2440 to 2960 m (8000 to 9700 ft). Tracer profiles and residence time distributions have been used to delineate changes in the fracture system, particularly in diagnosing pathological flow patterns and in identifying new injection and production zones. The effectiveness of one- and two-dimensional theoretical dispersion models utilizing single and multiple porous, fractured zones with velocity and formation dependent effects are discussed with respect to actual field data

  19. 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

  20. 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.

  1. 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)

  2. 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.

  3. Identification and characterization of conservative organic tracers for use as hydrologic tracers for the Yucca Mountain Site characterization study

    International Nuclear Information System (INIS)

    Dombrowski, T.; Stetzenbach, K.

    1993-01-01

    This report is in two parts one for the fluorinated benzoic acids and one for the fluorinated aliphatic acids. The assumptions made in the report regarding the amount of tracer that will be used, dilution of the tracer during the test and the length of exposure (if any) to individuals drinking the water were made by the authors. These assumptions must really come from the USGS hydrologists in charge of the c-well tracer testing program. Accurate estimates of dilution of the tracer during the test are also important because of solubility limitations of some of the tracers. Three of the difluorobenzoic acids have relatively low solubilities and may not be usable if the dilution estimates are large. The toxicologist that reviewed the document agreed with our conclusion that the fluorinated benzoic and toluic acids do not represent a health hazard if used under the conditions as outlined in the report. We are currently testing 15 of these compounds, and if even if three difluorobenzoic acids cannot be used because of solubility limitations we will still have 12 tracers. The toxicologist felt that the aliphatic fluorinated acids potentially present more of a health risk than the aromatic. This assessment was based on the fact of a known allergic response to halothane anesthetic. This risk, although minimal, is known and he felt that was enough reason to recommend against their use. The authors feel that the toxicologists interpretation of this risk was overly conservative, however, we will not go against his recommendation at this time for the following reasons. First, without the aliphatic compounds we still have 12 to 15 fluorinated aromatic acids which, should be enough for the c-well tests. Second, to get a permit to use aliphatic compounds would undoubtedly require a hearing which could be quite lengthy

  4. Rostock bioenergy forum. Future technologies for bioenergy. Proceedings; 4. Rostocker Bioenergieforum. Zukunftstechnologien fuer Bioenergie. Tagungsband

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2010-07-01

    diesel engines (Beate Richter); (19) The EU-Interreg project Baltic biogas bus (Petra Seidenberg); (20) Rearrangement of the local traffic on biogas within the scope of REK 'Natuerlich Ruegen' - Full power (Sarah Gehrig); (21) Biogas in Poland - actual condition and perspective of development (Krzystof Biernat); (22) Impact of regional factors on the universal validity of ecologically assessed evaluations of biogas (Daniela Dressler); (23) Comparison of solid/wet fermentation within the scope of biogas measurement program II (Britt Schumacher); (24) Sweet clover - an ecologically and economically attractive supplement to silage maize? (Ines Bull); (25) Near-IR spectroscopy for the evaluation of plant biomass for the use in biogas generation (Andrea Kraeft); (26) Investigation of internal power requirement of biogas plants using the research biogas plant Unterer Lindenhof as an example (Falk Baumgartner); (27) Research biogas plant Gut Huelsenberg (Dirk Banemann); (28) Investigation of the acid pattern and other important parameter in the fermenter during start up (Andreas Gurgel); (28) Significance of process engineering parameters for the yield of biogas and potential of residual gas (Gerd Reinhold); (29) Online investigation in NaWaRo biogas plants by eans of NIRS (Andreas Stockl); (30) Utilization of residues from pig farming for production of bioenergy in Cuba (Mathias Schlegel); (31) Ensiling of sugar beets as a substrate for biogas generation (Friedrich Weissbach); (32) Liquid fuels from biomass (Andreas Busch); (33) Digestion of lignocellulose for biogas generation (Dominik da Rocha); (34) Distribution of macronutrients and micronutrients after partly processing of fermentation residues by means of separation (Adam Feher); (35) How much energy is in the organics of municipal wastes from rural areas? (Andrea Schuech).

  5. Industrial and natural nuclear reactors; Industrielle und natuerliche Kernreaktoren

    Energy Technology Data Exchange (ETDEWEB)

    Binnewies, Michael [Hannover Univ. (Germany); Willner, Helge; Woenckhaus, Juergen

    2015-08-15

    As described in the preceding article, all elements with atomic masses above that of iron and also the radioactive elements thorium and uranium have been formed by a supernova star explosion. Their long-lived isotopes of thorium and uranium are now distributed in the earth crust. The chemistry of uranium and thorium is of less importance, but these elements can be used to produce enormous amounts of energy in nuclear power stations. It will be described how it works. Surprisingly, small natural nuclear reactors were producing heat during hundreds of thousand years. Subsequently, we are dealing with this phenomenon, the principle of nuclear fission, the different types of nuclear reactors, security aspects and new developments.

  6. Energy efficient processing of natural resources; Energieeffiziente Verarbeitung natuerlicher Rohstoffe

    Energy Technology Data Exchange (ETDEWEB)

    Pehlken, Alexandra [Univ. Bremen (Germany). Projekt FU2; Hans, Carl [Bremer Institut fuer Produktion und Logistik GmbH BIBA, Bremen (Germany). Abt. Intelligente Informations- und Kommunikationsumgebungen fuer die kooperative Produktion im Forschungsbereich Informations- und Kommunikationstechnische Anwendungen; Thoben, Klaus-Dieter [Univ. Bremen (Germany). Inst. fuer integrierte Produktentwicklung; Bremer Institut fuer Produktion und Logistik GmbH BIBA, Bremen (Germany). Forschungsbereich Informations- und kommunikationstechnische Anwendungen; Austing, Bernhard [Fa. Austing, Damme (Germany)

    2012-10-15

    Energy efficiency is gaining high importance in production processes. High energy consumption is directly related to high costs. The processing of natural resources is resulting in additional energy input because of defined output quality demands. This paper discussed approaches and IT-solutions for the automatically adjustment of production processes to cope with varying input qualities. The intention is to achieve the lowest energy input into the process without quality restraints.

  7. 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.

  8. Iodine 123-antipyrine. A diffusible tracer for brain exploration

    International Nuclear Information System (INIS)

    Dantonel-Mathieu, Evelyne.

    1978-09-01

    Iodine 123-labelled iodoantipyrine is a liposoluble diffusible tracer which crosses the blood-brain barrier intact. Its build-up in brain tissue is proportional to the regional blood flow. Its behavior was studied in undervascularised brain lesions and in cases where research with traditional radioactive tracers (99mTc and its different vectors for example) has proved limited. Because of the great diffusibility of iodoantipyrine a brain parenchyma image is obtained within minutes after its injection, and this by the use of a non-invasive technique and under good gamma-camera exploration conditions. 81 brain explorations including 11 standards have been carried out on subjects averaging 51,2 years old; these examinations took place in three nuclear medicine centres. The 123 I iodoantipyrine used in each nuclear medicine centre is supplied by the CEA. Iodoantipyrine is labelled with a good yield (>98%) checked by chromatography by means of a CEA kit. After intraveinous injection of 4 to 6 mCi iodine-123 iodoantipyrine, a dynamic study (from 0 to 60 seconds) of the tracer passage in the brain tissue may be followed by static images taken in the next minutes according to a standard procedure. The table of results shows the major interest of this tracer for the exploration of vascular accidents with ischemic lesions, especially in the early phase of the accident. The lesion appears as a hypoactive zone and this lack of perfusion lasts for some minutes after the injection [fr

  9. Using radioactive tracers for the evaluation of industrial equipment

    International Nuclear Information System (INIS)

    Brandao, Luis Eduardo Barreira; Sa, Lidia Vasconcellos de; Sousa, Alvaro Serafim F. de

    2000-01-01

    This paper presents the radioactive tracer technique, giving as example some cases of the possible utilization developed by the Nuclear Engineering Institute, RJ, BR (Argonaut reactor) and through charged particle (CV-28 cyclotron), and also his production and aspects of radiological safety

  10. Accurate assessment of exposure using tracer gas measurements

    DEFF Research Database (Denmark)

    Kierat, Wojciech; Bivolarova, Mariya; Zavrl, Eva

    2018-01-01

    analyzers with short and long response times, respectively. The tracer gas concentration was characterized by the mean, standard deviation and 95th percentile values. The results revealed that the measurement time needed to determine, with sufficient accuracy, these parameters decreased substantially...

  11. Radiation dose estimates for carbon-11-labelled PET tracers

    International Nuclear Information System (INIS)

    Aart, Jasper van der; Hallett, William A.; Rabiner, Eugenii A.; Passchier, Jan; Comley, Robert A.

    2012-01-01

    Introduction: Carbon-11-labelled positron emission tomography (PET) tracers commonly used in biomedical research expose subjects to ionising radiation. Dosimetry is the measurement of radiation dose, but also commonly refers to the estimation of health risk associated with ionising radiation. This review describes radiation dosimetry of carbon-11-labelled molecules in the context of current PET research and the most widely used regulatory guidelines. Methods: A MEDLINE literature search returned 42 articles; 32 of these were based on human PET data dealing with radiation dosimetry of carbon-11 molecules. Radiation burden expressed as effective dose and maximum absorbed organ dose was compared between tracers. Results: All but one of the carbon-11-labelled PET tracers have an effective dose under 9 μSv/MBq, with a mean of 5.9 μSv/MBq. Data show that serial PET scans in a single subject are feasible for the majority of radiotracers. Conclusion: Although differing in approach, the two most widely used regulatory frameworks (those in the USA and the EU) do not differ substantially with regard to the maximum allowable injected activity per PET study. The predictive validity of animal dosimetry models is critically discussed in relation to human dosimetry. Finally, empirical PET data are related to human dose estimates based on homogenous distribution, generic models and maximum cumulated activities. Despite the contribution of these models to general risk estimation, human dosimetry studies are recommended where continued use of a new PET tracer is foreseen.

  12. Production of a tracer packet of heavier rare earth elements

    International Nuclear Information System (INIS)

    Lahiri, S.; Nayak, D.; Maji, S.

    2004-01-01

    Production of a tracer packet of heavier rare earth elements containing carrier-free radionuclides of 153,155 Tb, 153,155,157 Dy, 159 Ho, 159,161 Er, 161 Tm produced by medium energy 7 Li and 12 C irradiation on an europium oxide target and the subsequent separation of bulk europium from the carrier-free products is described. (author)

  13. Molecules as tracers of galaxy evolution: an EMIR survey

    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...

  14. 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)

  15. Off-gassing induced tracer release from molten basalt pools

    International Nuclear Information System (INIS)

    Cronenberg, A.W.; Callow, R.A.

    1994-01-01

    Two in situ vitrification (ISV) field tests were conducted at the Idaho National Engineering Laboratory (INEL) during the summer of 1990 to assess ISV suitability for long-term stabilization of buried waste that contains transuranic and other radionuclide contaminants. The ISV process uses electrical resistance heating to melt buried waste and soil in place, which upon cooldown and resolidification fixes the waste into a vitrified (glass-like) form. In these two ISV field tests, small quantities of rare-earth oxides (tracers DY 2 O 3 , Yb 2 O 3 , and Tb 4 O 7 ) were placed in the test pits to simulate the presence of plutonium oxides and assess plutonium retention/release behavior. The analysis presented in this report indicates that dissolution of tracer oxides into basaltic melts can be expected with subsequent tracer molecular or microparticle carry-off by escaping gas bubbles, which is similar to adsorptive bubble separation and ion flotation processes employed in the chemical industry to separate dilute heavy species from liquids under gas sparging conditions. Gaseous bubble escape from the melt surface and associated aerosolization is believed to be responsible for small quantities of tracer ejection from the melt surface to the cover hood and off-gas collection system. Methods of controlling off-gassing during ISV would be expected to improve the overall retention of such heavy oxide contaminants during melting/vitrification of buried waste

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

    Directory of Open Access Journals (Sweden)

    Fécamp C.

    2013-05-01

    Full Text Available 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.

  17. Circulation of cerebrospinal fluid. Comparative study of various tracers

    International Nuclear Information System (INIS)

    Bok, B.; Thebault, B.; Cavailloles, F.; Aboulker, J.

    1977-01-01

    The dynamics of cerebrospinal fluid in the spinal subarachnoid space is studied by gammamyelography. There are still controversies about the ideal properties of the tracer to be used. The influence of the tracer's molecular weight on the kinetic of ascent in the medullar cerebrospinal fluid with a view to rating the criterias for choice of an available radiopharmaceutical was evaluated. Three compounds injected simultaneously through a lombar puncture were compared: indium 111 labelled transferrin, iodine 131 labelled human serum albumin and technetium 99m labelled diethylenetriaminepentaacetic acid. The individual stability of the compounds and a possible interference between them was investigated especially by electrophoretic technics. A spectrometric study showed that it is possible to simultaneously identify and count each of the isotopes included in the mixture on the detector device: an hybrid scanner. The comparison of linear activity profils collected on phantoms and on ten patients showed a similar fate of the three compounds during the first hours of the investigation studying the ascent of tracers into basal cisterns either in normal or pathological patients. It is therefore concluded that molecular weight does not influence in a detectable manner the spinal C.S.F. kinetics of the radiopharmaceuticals. This allows the use of the most convenient and best tolerated tracer from the dosimetric and toxicological stand point [fr

  18. Accuracy of tracer stimulus response experiments in laminar flows

    Czech Academy of Sciences Publication Activity Database

    Chlup, Hynek; Novotný, Pavel; Žitný, R.

    2012-01-01

    Roč. 55, 23-24 (2012), s. 6458-6462 ISSN 0017-9310 Institutional research plan: CEZ:AV0Z20760514 Keywords : residence time distribution * tracer injection * laminar convective dominated flow Subject RIV: JB - Sensors, Measurment, Regulation Impact factor: 2.315, year: 2012 http://www.sciencedirect.com/science/article/pii/S001793101200470X

  19. Atlantic Coast Unique Regional Atmospheric Tracer Experiment (ACURATE)

    International Nuclear Information System (INIS)

    Schubert, J.F.; Heffter, J.L.; Mead, G.A.

    1985-01-01

    A long-range, long-term data set on the regional scale for air pollution model was developed for evaluation. The ACURATE model used Kr-85 emitted intermittently from the Savannah River Plant as a tracer of hourly source emission data at 5 sites for a total of 3858 measurements

  20. Joint interpretation of two tracer tests with reversed flow fields

    International Nuclear Information System (INIS)

    Kunstmann, H.; Kinzelbach, W.; Marschall, P.; Li, G.

    1995-01-01

    Two dipole tracer experiments were performed in a fractured rock at the Grimsel Test Site in February/March 1993. In both experiments NaCl was used as a tracer. The extraction rate was twice the injection rate. In the second experiment injection and extraction were interchanged (Reverse-Experiment). Long tailing was characteristic for the breakthrough curves in both experiments. The tests were interpreted using a single fracture flow model. Tracer transport is described by advection/dispersion along the fracture allowing for diffusion into an immobile matrix. The authors were able to interpret the breakthrough curves for both experiments by one unique set of parameters, describing transport and baseflow. Uniqueness could only be achieved when using the information of both experiments. The authors conclude that performing a Reverse-Experiment is an indispensable tool for parameter identification in dipole tracer tests. A sensitivity analysis suggested that not only matrix diffusion is responsible for the tailing in the breakthrough curves but also transversal dispersivity. Further, the typical exchange time between mobile and immobile media was too small to be attributed to matrix diffusion in the strict sense which will cause tailing even at large spatial and temporal scales. Analysis of the covariance matrices showed that the parameters have small errors but high correlation

  1. 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.

  2. Tracer investigations of natural and polluted sea sediment movement

    International Nuclear Information System (INIS)

    Pruszak, Z.

    1994-01-01

    Results of tracer investigations and bottom sediment movement analysis (natural and polluted) performed world-wide have been shown. Polish investigations have been compared to these results. A critical estimation and analysis of particular elements of sediment movement: thickness of the drag layer and various characteristics of bottom transport evaluated in different time-space scales has been performed. 14 refs, 9 figs

  3. Radioactive tracers in the assessment of cleaning of surgical appliances

    International Nuclear Information System (INIS)

    Mostafa, A.B.M.G.; Chackett, K.F.

    1975-01-01

    Radioactive tracers which may be used in the assessment of cleaning of surgical appliances are described. Five labelled compounds were used as soiling material and tested in the rather severe conditions that exist during cleaning cycles. Measurements of decontamination in two cases were considered reliable but in the other three some degree of decomposition of the soil occurred, which falsified the results. (author)

  4. General circulation and tracers: studies in the Western Indian Ocean

    International Nuclear Information System (INIS)

    Jamous, Daniel

    1991-01-01

    The main question addressed in this thesis is how to best use the information obtained from hydro-biogeochemical tracer data, to study the oceanic general circulation in the Western Indian Ocean. First, a principal component analysis is performed on a historical data set. The tracers considered are temperature, salinity, density, oxygen, phosphate and silica. The method reduces the amount of data to be considered by a factor of 5. It reproduces correctly and efficiently the large-scale distributions of these oceanic properties. The analysed data are then used in a finite-difference nonlinear inverse model. The grid has a resolution of 4 deg. by 4 deg.. Dynamical as well as tracer conservation constraints are used. These constraints are well satisfied by the obtained solutions but the associated errors remain large. Additional constraints would be required in order to discuss the different solutions in more detail. Finally, a qualitative study is done on the deep distribution of helium-3. The data show several important features linked to hydrothermal input in the Gulf of Aden and on the Central Indian Ridge, and to the origin of water masses and deep circulation characteristics. However additional data are required in order to clarify the distribution of this tracer in other key areas. (author) [fr

  5. Interest of radioactive tracers in fruit cultivation research

    International Nuclear Information System (INIS)

    Ferauge, M.T.; Dreze, Ph.

    1976-01-01

    The authors report some results related to the use of tracer techniques applied to nutrition and physiological diseases of fruit trees. Penetration and fate of several mineral and organic elements either by root system or by aerial parts of the trees are studied. (J.C.)

  6. How to Program a Domain Independent Tracer for Explanations

    Science.gov (United States)

    Ishizaka, Alessio; Lusti, Markus

    2006-01-01

    Explanations are essential in the teaching process. Tracers are one possibility to provide students with explanations in an intelligent tutoring system. Their development can be divided into four steps: (a) the definition of the trace model; (b) the extraction of the information from this model; (c) the analysis and abstraction of the extracted…

  7. The use of radioisotope tracers in the metallurgical industries

    International Nuclear Information System (INIS)

    Easey, J.F.

    1987-01-01

    Radioisotope techniques have been widely used in the metallurgical industries for many years. They have been shown to be very suitable for studying large scale plant and, in many cases, they are the most suitable techniques for such investigations. Applications of radioisotope tracers to some specific metallurgical problems are discussed. (author)

  8. 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.

  9. In-situ testing methods using radioactive tracers

    International Nuclear Information System (INIS)

    Sauzay, G.

    1976-01-01

    Some typical applications of tracer techniques in hydrology are presented: study of the extraction of sands and gravels in a estuary; in-situ study of the transport of sediments by the swell at a depth ranging from 8 to 22m; study of the transport of sands on the site Bonne Anse - Saint Palais [fr

  10. 76 FR 71610 - Market Test of First-Class Tracer

    Science.gov (United States)

    2011-11-18

    ... electronically by accessing the ``Filing Online'' link in the banner at the top of the Commission's Web site... Commission. Id. at 6. A First-Class Tracer, which consists of a barcoded label, tracing number, and QR Code... 28, 2011. The filing can be accessed via the Commission's Web site ( http://www.prc.gov ). The...

  11. Lagrangian Transport Calculations Using UARS Data. Part I: Passive Tracers

    Science.gov (United States)

    Manney, G. L.; Lahoz, W. A.; Harwood, R. S.; Zurek, R. W.; Kumer, J. B.; Mergenthaler, J. L.; Roche, A. E.; O'Neill, A; Swinbank, R.; Waters, J. W.

    1994-01-01

    The transport of passive tracers observed by UARS has been simulated using computed trajectories of thousands of air parcels initialized on a three-dimensional stratospheric grid. These trajectories are calculated in isentropic coordinates using horizontal winds provided by the United Kingdom Meteorological Office data assimilation system and vertical (cross-isentropic) velocities computed using a fast radiation code.

  12. Fluorescence guided surgery and tracer-dose, fact or fiction?

    International Nuclear Information System (INIS)

    KleinJan, Gijs H.; Olmos, Renato A.V.; Bunschoten, Anton; Berg, Nynke S. van den; Klop, W.M.C.; Horenblas, Simon; Poel, Henk G. van der; Wester, Hans-Juergen; Leeuwen, Fijs W.B. van

    2016-01-01

    Fluorescence guidance is an upcoming methodology to improve surgical accuracy. Challenging herein is the identification of the minimum dose at which the tracer can be detected with a clinical-grade fluorescence camera. Using a hybrid tracer such as indocyanine green (ICG)- 99m Tc-nanocolloid, it has become possible to determine the accumulation of tracer and correlate this to intraoperative fluorescence-based identification rates. In the current study, we determined the lower detection limit of tracer at which intraoperative fluorescence guidance was still feasible. Size exclusion chromatography (SEC) provided a laboratory set-up to analyze the chemical content and to simulate the migratory behavior of ICG-nanocolloid in tissue. Tracer accumulation and intraoperative fluorescence detection findings were derived from a retrospective analysis of 20 head-and-neck melanoma patients, 40 penile and 20 prostate cancer patients scheduled for sentinel node (SN) biopsy using ICG- 99m Tc-nanocolloid. In these patients, following tracer injection, single photon emission computed tomography fused with computed tomography (SPECT/CT) was used to identify the SN(s). The percentage injected dose (% ID), the amount of ICG (in nmol), and the concentration of ICG in the SNs (in μM) was assessed for SNs detected on SPECT/CT and correlated with the intraoperative fluorescence imaging findings. SEC determined that in the hybrid tracer formulation, 41 % (standard deviation: 12 %) of ICG was present in nanocolloid-bound form. In the SNs detected using fluorescence guidance a median of 0.88 % ID was present, compared to a median of 0.25 % ID in the non-fluorescent SNs (p-value < 0.001). The % ID values could be correlated to the amount ICG in a SN (range: 0.003-10.8 nmol) and the concentration of ICG in a SN (range: 0.006-64.6 μM). The ability to provide intraoperative fluorescence guidance is dependent on the amount and concentration of the fluorescent dye accumulated in the lesion(s) of

  13. INTRAVAL Finnsjoen Test - modelling results for some tracer experiments

    International Nuclear Information System (INIS)

    Jakob, A.; Hadermann, J.

    1994-09-01

    This report presents the results within Phase II of the INTRAVAL study. Migration experiments performed at the Finnsjoen test site were investigated. The study was done to gain an improved understanding of not only the mechanisms of tracer transport, but also the accuracy and limitations of the model used. The model is based on the concept of a dual porosity medium, taking into account one dimensional advection, longitudinal dispersion, sorption onto the fracture surfaces, diffusion into connected pores of the matrix rock, and sorption onto matrix surfaces. The number of independent water carrying zones, represented either as planar fractures or tubelike veins, may be greater than one, and the sorption processes are described either by linear or non-linear Freundlich isotherms assuming instantaneous sorption equilibrium. The diffusion of the tracer out of the water-carrying zones into connected pore space of the adjacent rock is calculated perpendicular to the direction of the advective/dispersive flow. In the analysis, the fluid flow parameters are calibrated by the measured breakthrough curves for the conservative tracer (iodide). Subsequent fits to the experimental data for the two sorbing tracers strontium and cesium then involve element dependent parameters providing information on the sorption processes and on its representation in the model. The methodology of fixing all parameters except those for sorption with breakthrough curves for non-sorbing tracers generally worked well. The investigation clearly demonstrates the necessity of taking into account pump flow rate variations at both boundaries. If this is not done, reliable conclusions on transport mechanisms or geometrical factors can not be achieved. A two flow path model reproduces the measured data much better than a single flow path concept. (author) figs., tabs., 26 refs

  14. Use of natural geochemical tracers to improve reservoir simulation models

    Energy Technology Data Exchange (ETDEWEB)

    Huseby, O.; Chatzichristos, C.; Sagen, J.; Muller, J.; Kleven, R.; Bennett, B.; Larter, S.; Stubos, A.K.; Adler, P.M.

    2005-01-01

    This article introduces a methodology for integrating geochemical data in reservoir simulations to improve hydrocarbon reservoir models. The method exploits routine measurements of naturally existing inorganic ion concentration in hydrocarbon reservoir production wells, and uses the ions as non-partitioning water tracers. The methodology is demonstrated on a North Sea field case, using the field's reservoir model, together with geochemical information (SO{sub 4}{sup 2}, Mg{sup 2+} K{sup +}, Ba{sup 2+}, Sr{sup 2+}, Ca{sup 2+}, Cl{sup -} concentrations) from the field's producers. From the data-set we show that some of the ions behave almost as ideal sea-water tracers, i.e. without sorption to the matrix, ion-exchange with the matrix or scale-formation with other ions in the formation water. Moreover, the dataset shows that ion concentrations in pure formation-water vary according to formation. This information can be used to allocate produced water to specific water-producing zones in commingled production. Based on an evaluation of the applicability of the available data, one inorganic component, SO{sub 4}{sup 2}, is used as a natural seawater tracer. Introducing SO{sub 4}{sup 2} as a natural tracer in a tracer simulation has revealed a potential for improvements of the reservoir model. By tracking the injected seawater it was possible to identify underestimated fault lengths in the reservoir model. The demonstration confirms that geochemical data are valuable additional information for reservoir characterization, and shows that integration of geochemical data into reservoir simulation procedures can improve reservoir simulation models. (author)

  15. A comparison of resting images from two myocardial perfusion tracers

    International Nuclear Information System (INIS)

    Anagnostopoulos, C.; Laney, R.; Pennell, D.; Proukakis, H.; Underwood, R.

    1995-01-01

    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%]. 201 Tl was injected during infusion of adenosine followed by acquisition of conventional stress and redistribution tomograms. On a separate day, 201 Tl was injected at rest with imaging 4 h later. 99m Tc-MIBI was then given at rest and imaging was performed. Three images were compared: redistribution 201 Tl, rest 201 Tl, and rest 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 201 Tl 69%±12%, redistribution 201 Tl 69%±15%, rest 99m Tc-MIBI 70%±13%), but in group 2 mean tracer uptake was significantly greater in the rest 201 Tl images (59%±16%) than in redistribution 201 Tl images (53%±17%) or rest 99m Tc-MIBI images (53%±19%). Overall agreement for regional uptake score was excellent (κ from 0.79 to 0.84), although there were a significant number of segments with less uptake shown by redistribution 201 Tl and by rest 99m Tc-MIBI than by rest 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 201 Tl identified significantly more segments as viable than the other images. (orig./MG) (orig.). With 1 fig., 7 tabs

  16. 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

  17. 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

  18. Inert tracer wind resuspension as a function of wind speed, atmospheric stability, and initial tracer particle size

    International Nuclear Information System (INIS)

    Sehmel, G.A.; Lloyd, F.D.

    1979-01-01

    Wind-caused resuspension rates are being determined in three different, long-term, inert-tracer field experiments. Chemical results were recently received from an accumulated backlog of air filter samples. Resuspension rates are yet to be calculated from these data

  19. 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...

  20. 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

  1. Solar thermal power plants for the Mediterranean region: A chance for a new era in the field of electricity supply; Solarthermische Kraftwerke fuer den Mittelmeerraum: Chance fuer eine neue Aera der Elektrizitaetsversorgung

    Energy Technology Data Exchange (ETDEWEB)

    Nitsch, J [DLR, Stuttgart (Germany)

    1994-12-31

    One promising option for a really environmentally and climaticly friendly electricity supply is the erection of solar thermal power plants in regions of the earth with a considerably high solar irradiation. In this work the technical and economical chances for this technology are analysed and explanations are given as to which energetic and econmic marginal conditions must be created for a successful market introduction, which could already be initiated with several demonstration power plants. (orig.) [Deutsch] Eine der vielversprechenden Optionen fuer wirklich umwelt- und klimafreundliche Elektrizitaetsversorgung stellt der Bau solarthermischer Kraftwerke in den einstrahlungsreichen Regionen der Erde dar. Der Beitrag analysiert die technisch-oekonomischen Chancen dieser Technologie und zeigt auf, welche energiewirtschaftlichen Randbedingungen als Voraussetzung fuer eine erfolgreiche Markteinfuehrung geschaffen werden muessen, die schon jetzt mit einer Reihe von Demonstrationskraftwerken beginnen koennte. (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. Transformation strategies for multi-utility companies; Transformationsstrategien fuer Multi Utility-Unternehmen

    Energy Technology Data Exchange (ETDEWEB)

    Apking, W.; Bosse, F.; Kroepelin, C.; Schaudinn, D.; Uhlmann, K. [PriceWaterhouseCoopers Unternehmensberatung GmbH, Hamburg (Germany)

    2000-05-01

    Energy supply companies (resellers) and electric utilities as traders in the liberalized markets increasingly focus their activities on their core businesses and offer their capabilites also in other branches of industry, thus achieving synergistic effects. The evolution of e-commerce in the energy supply sector in Germany is described in this article, and recommendations are given to companies as to suitable change management strategies for successful marketing and procurement via the world wide web, using IP technologies as a basis for transactions. (CB) [German] Energieversorgungsunternehmen (EVU) besinnen sich auf ihre Kernkompetenzen, bieten diese auch in anderen Branchen an und erzielen damit Synergieeffekte. Ein weiterer Aspekt ist die zunehmende Vernetzung der europaeischen Stromnetze. Die Konvergenz der Maerkte wird ferner durch den Einsatz von IP(Internet-Protokoll)-Technologien vorangetrieben, da das Internet eine Informations- und Transaktionsplattform fuer saemtliche Marktteilnehmer schafft. Welche diesbezueglichen Transformationsstrategien von den EVU bereits heute zu ergreifen sind, wird anschaulich aus einem hierzu entwickelten Modell abgeleitet. (orig./CB)

  4. Special liquid nitrogen dewar for a superconducting levitation transport system; Spezialkryostat fuer ein supraleitendes Schwebetransportsystem

    Energy Technology Data Exchange (ETDEWEB)

    Schumann, B.; Binneberg, A. [ILK Dresden gGmbH, Dresden (Germany)

    2002-07-01

    Within a joint project supported by the Free State Saxony a novel bearing and transport system was developed. The prototype is based on the combination of the magnetic bearing technique using high temperature-superconductors with a non-contacting linear drive. This non-contracting 'lift' is free from friction and contaminations due to wear and therefore predestinated for applications in clean rooms, e.g. in the microelectronic technology. (orig.) [German] Im Rahmen eines Verbundprojektes, gefoerdert vom Freistaat Sachsen, wurde ein neuartiges Lager- und Transportsystem in Form einer Kombination der supraleitenden Magnetlagertechnik mit Hochtemperatursupraleitern und einem beruehrungslos arbeitenden Linearantriebssystem am Beispiel eines Demonstrators entwickelt. Der voellig beruehrungslos und damit reibungs- und abriebfrei funktionierende Lift ist fuer Anwendungen in Reinraeumen z.B. in der Mikroelektroniktechnologie praedestiniert. (orig.)

  5. Market research and marketing for the mobility; Marktforschung und Marketing fuer die Mobilitaet

    Energy Technology Data Exchange (ETDEWEB)

    Meinig, W. [Bamberg Univ. (Germany)

    1994-12-31

    The explanations, which have been given in the talk are supposed to reveal, that the aim of the marketing for electric-powered vehicles is not to carry the idea of environmental protection into the society. It is far more important to use the power of the present environmental consciousness in order to guarantee the consumers demands for mobility, taking into consideration the ecological interests. (orig.) [Deutsch] Die vorstehenden Ausfuehrungen sollten insbesondere deutlich machen, dass das Ziel eines Marketing fuer E-Mobile nicht darin bestehen kann, den Umweltschutzgedanken in die Gesellschaft zu tragen. Vielmehr geht es darum, die Schubkraft vorhandenen Umweltbewusstseins dafuer zu nutzen, Mobilitaetsbeduerfnisse von Konsumenten unter Bewahrung oekologischer Interessen sicherzustellen. (orig.)

  6. Artificial intelligence for automotive applications - noise modelling; Kuenstliche Intelligenz fuer Fahrzeuganwendungen - Modellierung des Motorgeraeusches

    Energy Technology Data Exchange (ETDEWEB)

    Suchar, R. [nodes GmbH, Muenchen (Germany)

    2000-12-01

    Reducing the noise level in the interior of vehicles is both a comfort necessity and a challenging technical task. Reliable identification of the accessories responsible for high or low engine-noise levels in the interior of cars classically requires costly, time-consuming, extensive measurement sessions. Artificial intelligence tools efficiently solve the mentioned system-identification problem, and provide a principled way of extracting the information of interest from reduced size databases. (orig.) [German] Kuenstliche neuronale Netze, Fuzzy-Systeme, genetische Algorithmen - vor einem Jahrzehnt haette man gesagt, diese Begriffe stammen aus einem Science-Fiction-Roman. Heute verwenden sie Forscher an Hochschulen und in der Industrie mit dem gemeinsamen Ziel, kuenstliche Intelligenz (KI) in Real-Life-Projekte zu integrieren. Waehrend das Spektrum technischer Applikationen und kommerzieller Produkte sehr weit ist, konzentriert sich der vorliegende Beitrag auf eine spezielle Fahrzeuganwendung, die auf kuenstlichen neuronalen Netzen (KNN) basiert: die Ermittlung der Ausstattungsmerkmale, die fuer hohen Motorgeraeuschpegel im Fahrzeuginneren verantwortlich sind. (orig.)

  7. 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.)

  8. 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.)

  9. Municipal energy concepts. A service task for electric utility companies; Kommunale Energiekonzepte. Eine Dienstleistungsaufgabe fuer Energieversorgungsuntemehmen

    Energy Technology Data Exchange (ETDEWEB)

    Just, W. [Stadtwerke Gelsenkirchen GmbH (Germany)

    1994-11-01

    The article explains to what extent suitable measures can be realized and supported in a municipality with municipal energy concepts or even climate protection concepts. The target is to attain with limited financial means the most favourable economic and ecological effects in the municipality or in the region. Many electric utilities have in the last years forced the realization of energy conservation measures and have become energy service companies. With their expert knowledge they are ideal partners for politics, public adminstration and citizens. They have the best qualificatons for the development and realization of municipal concepts. In many cases it shows that with detailed studies the target can be quicker and more effectively attained as with extensive, time-consuming and expensive studies which are not particularly realization-oriented. The report is to give examples which might be helpful for the development of a concept. (orig./UA) [Deutsch] Der Beitrag erlaeutert, inwieweit umfangreiche kommunale Energiekonzepte oder sogar Klimaschutzkonzepte geeignete Massnahmen in der Kommune realisieren und foerdern koennen. Ziel sollte sein, mit begrenztem Mitteleinsatz die oekonomisch-oekologisch groessten Effekte in der Kommune bzw. in der Region zu erzielen. Viele Energie-Versorgungsunternehmen haben in den letzten Jahren die Realisierung von Energieparmassnahmen vorangetrieben und sich zu Energie-Dienstleistungsunternehmen entwickelt. Mit ihrer Sachkompetenz sind sie der ideale Partner fuer Politik, oeffentliche Verwaltung und Buerger/innen. Sie bringen die besten Voraussetzungen mit bei der Erarbeitung und Umsetzung von kommunalen Konzepten. Vielfach zeigt sich, dass Detailkonzepte schneller und wirkungsvoller zum Ziel fuehren, als umfachreiche, zeitaufwendige und teure Studien, die wenig umsetzungsorientiert sind. Die nachfolgenden Ausfuehrungen sind als Beispiele gedacht. Sie koennen Anregungen fuer die Erstellung eines Konzeptes vermitteln. (orig./UA)

  10. Potential tracers for tracking septic tank effluent discharges in watercourses.

    Science.gov (United States)

    Richards, Samia; Withers, Paul J A; Paterson, Eric; McRoberts, Colin W; Stutter, Marc

    2017-09-01

    Septic tank effluent (STE) contributes to catchment nutrient and pollutant loads. To assess the role of STE discharges in impairment of surface water, it is essential to identify the sources of pollution by tracing contaminants in watercourses. We examined tracers that were present in STE to establish their potential for identifying STE contamination in two stream systems (low and high dilution levels) against the background of upstream sources. The studied tracers were microbial, organic matter fluorescence, caffeine, artificial sweeteners and effluent chemical concentrations. The results revealed that tracer concentration ratios Cl/EC, Cl/NH 4 -N, Cl/TN, Cl/TSS, Cl/turbidity, Cl/total coliforms, Cl/sucralose, Cl/saccharin and Cl/Zn had potential as tracers in the stream with low dilution level (P < 0.05). Fluorescence spectroscopy could detect STE inputs through the presence of the tryptophan-like peak, but was limited to water courses with low level of dilution and was positively correlated with stream Escherichia coli (E. coli) and soluble reactive phosphorus (SRP). The results also suggested that caffeine and artificial sweeteners can be suitable tracers for effluent discharge in streams with low and high level of dilution. Caffeine and saccharin were positively correlated with faecal coliforms, E. coli, total P and SRP, indicating their potential to trace discharge of a faecal origin and to be a marker for effluent P. Caffeine and SRP had similar attenuation behaviour in the receiving stream waters suggesting caffeine's potential role as a surrogate indicator for the behaviour of P downstream of effluent inputs. Taken together, results suggest that a single tracer alone was not sufficient to evaluate STE contamination of watercourses, but rather a combination of multiple chemical and physical tracing approaches should be employed. A multiple tracing approach would help to identify individual and cumulative STE inputs that pose risks to stream waters in

  11. Macromolecular contrast media. A new approach for characterising breast tumors with MR-mammography; Makromolekulare Kontrastmittel fuer die MR-Mammographie. Ein neuer Ansatz fuer die Charakterisierung von Mammatumoren

    Energy Technology Data Exchange (ETDEWEB)

    Daldrup, H.E. [Contrast Media Lab., Dept. of Radiology, California Univ., San Francisco, CA (United States)]|[Muenster Univ. (Germany). Inst. fuer Klinische Radiologie; Roberts, T.P.L.; Roberts, H.C. [Contrast Media Lab., Dept. of Radiology, California Univ., San Francisco, CA (United States)]|[Mainz Univ. (Germany). Klinik und Poliklinik fuer Radiologie; Muehler, A. [Contrast Media Lab., Dept. of Radiology, California Univ., San Francisco, CA (United States)]|[Berlex Laboratories, Wayne, NJ (United States); Gossmann, A. [Contrast Media Lab., Dept. of Radiology, California Univ., San Francisco, CA (United States)]|[Koeln Univ. (Germany). Inst. und Poliklinik fuer Radiologische Diagnostik; Wendland, M.; Brasch, R.C. [Muenster Univ. (Germany). Inst. fuer Klinische Radiologie; Rosenau, W. [California Univ., San Francisco, CA (United States). Dept. of Pathology

    1997-09-01

    The value of macromolecular contrast agents (MMCM) for the characterization of benign and malignant breast tumors will be demonstrated in this review. Animal studies suggest a high potential of MMCM to increase the specificity of MR-mammography. The concept of tumor differentiation is based on the pathological hyperpermeability of microvessels in malignant tumors. MMCM show a leak into the interstitium of carcinomas, whereas they are confined to the intravascular space in benign tumors. Capabilities and limitations of the MMCM-prototype. Albumin-Gd-DTPA, for breast tumor characterization will be summarized and compared to the standard low molecular weight contrast agent Gd-DTPA. Initial experience with new MMCM, such as Dendrimers, Gd-DTPA-Polylysine and MS-325 will be outlined. The potential of `blood-pool`-iron oxides, such as AMI-227 for the evaluation of tumor microvascular permeabilities will be discussed. (orig.) [Deutsch] Diese Uebersicht stellt den Stellenwert makromolekularer Kontrastmittel (MMKM) fuer die MR-tomographische Charakterisierung von benignen und malignen Mammatumoren dar. Aufgrund experimenteller Studien lassen MMKM eine signifikante Verbesserung der Spezifitaet der dynamischen kontrastmittelunterstuetzten MR-Mammographie erwarten. Das differentialdiagnostische Konzept beruht auf der pathologischen Hyperpermeabilitaet von Kapillaren in Karzinomen, die einen MMKM-Austritt in das Tumorinterstitium bedingt, waehrend die intakten Kapillaren benigner Tumoren nicht permeabel fuer MMKM sind. Diagnostische Moeglichkeiten und Grenzen des MMKM-Prototyps, Albumin-Gd-DTPA (92 kD), werden dargestellt und mit dem niedermolekularen Standard-Kontrastmittel Gd-DTPA (500 D) verglichen. Erste Erfahrungen mit neuen, fuer die klinische Anwendung optimierten MMKM-Praeparaten, wie das Kaskadenpolymer, Gd-DTPA-Polylysine und das MS-325 werden vorgestellt. Das Potential von Blood-pool-Eisenoxidpraeparaten, z.B. AMI-227, fuer die Bestimmung von

  12. The Institut for Mining - Chair in the Theory of Mining Methods and Operations at Clausthal Technological University; Das Institut fuer Bergbau - Professur fuer Bergbauliche Verfahrens- und Betriebslehre der TU Clausthal

    Energy Technology Data Exchange (ETDEWEB)

    Knissel, W.; Mischo, H. [Technische Univ. Clausthal, Clausthal-Zellerfeld (Germany). Inst. fuer Bergbau

    2002-09-05

    The Chair in the Theory of Mining Methods and Operations (Deep Mines) at the Institute for Mining at Clausthal Technological University deals with the theory of and research into underground extraction of solid mineral raw materials. With the concentration and concentration of the German mining industry the department has focussed more attention on foreign mining industries and utilisation of the earth's crust in general. The extractive mining industry is augmented by the underground utilisation of cavities for disposal purposes and for infrastructural tasks. Accordingly the courses offered have been extended towards environmental protection and geotechnics. In particular basic research in the field of disposal in mines has become one of the main areas of research in the department not least of all because of the financing from public funds. Theory, research and further training now cover underground extraction in mines, disposal in mines and rehabilitation of contaminated industrial sites. (orig.) [German] Die Proffesur fuer Bergbauliche Verfahrens- und Betriebslehre (Tiefbau) am Institut fuer Bergbau der TU Clausthal befasst sich in Lehre und Forschung mit der untertaegigen Gewinnung von festen mineralischen Rohstoffen. Mit dem Rueckgang und der Konzentration des deutschen Bergbaus hat sich der Lehrstuhl staerker dem Auslandsbergbau und allgemein der Erdkrustennutzung zugewandt. Der Gewinnungsbergbau findet seine Ergaenzung in der untertaegigen Nutzung von Hohlraeumen fuer Entsorgungszwecke und fuer Infrastrukturaufgaben. Dementsprechend ist das Studienangebot in Richtung Umweltschutz und Geotechnik erweitert worden. Insbesondere die Grundlagenforschung auf dem Gebiet des Entsorgungsbergbaus ist zu einem Forschungsschwerpunkt des Lehrstuhls geworden, nicht zuletzt aufgrund der Finanzierung aus oeffentlichen Mitteln. Lehre, Forschung und Weiterbildung decken heute den untertaegigen Gewinnungsbergbau, den Entsorgungsbergbau sowie die Sanierung von

  13. 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)

  14. Energy price report for Baden-Wuerttemberg 2016. Final report; Energiepreisbericht fuer Baden-Wuerttemberg 2016. Endbericht

    Energy Technology Data Exchange (ETDEWEB)

    Guel, Sarah; Cherkasky, Jenny

    2017-05-19

    This report describes the historical development of energy prices in recent years up to and including 2016 in Germany and Baden-Wuerttemberg and estimates the future development until 2023. The report addresses the markets for oil, gas, electricity and heat, which are summarized below. In addition, an estimate of the energy costs for households and industry and the associated burden is made. [German] Der vorliegende Bericht beschreibt die historische Entwicklung der Energiepreise der letzten Jahre bis einschliesslich 2016 in Deutschland und in Baden-Wuerttemberg und schaetzt die zukuenftige Entwicklung bis 2023 ab. Dabei geht der Bericht auf die Maerkte fuer Oel, Gas, Strom und Waerme ein, welche im Folgenden zusammengefasst werden. Zudem wird eine Abschaetzung der Energiekosten fuer Haushalte und Industrie und der damit verbundenen Belastung vorgenommen.

  15. 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)

    1997-12-31

    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)

  16. 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.)

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

    International Nuclear Information System (INIS)

    Suzui, N.; Kawachi, N.; Ishioka, N.; Fujimaki, S.; Yamaguchi, M.

    2009-01-01

    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)

  18. 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)

  19. A universal concept for IV-supported operation management; Ein universelles Konzept fuer die IV-gestuetzte Betriebsfuehrung

    Energy Technology Data Exchange (ETDEWEB)

    Sturm, A.

    1997-12-31

    The continuing rise in cost pressure calls for measures for enhancing the efficiency of operation management and maintenance. At the same time it is necessary to maintain the requisite reliability of production and keep abreast of the ever more stringent requirements of working safety and environment protection. This paper presents an integral operation management system for production plants which does justice to both the productive and the and the conserving function of operation management. The development and introduction of this system to conventional power plants has meanwhile begun. The system consistently gives consideration to the fact that operation management depends on processing data and information of different properties. Whereas process data can show strong fluctuations, there are many kinds of information on the plant concerning, for example, plant installations, processes, damage, and maintenance which hardly fluctuate at all or only change over long time periods. These latter include plant and installation addresses, technical data on the system or on maintenance. In operation management systems designed for production plants it can therefore be useful to organise the handling of process data (dynamic data) and plant data (static data) separately. [Deutsch] Der immer staerkere Kostendruck erfordert Massnahmen zur Effizienzsteigerung der Betriebsfuehrung und der Instandhaltung bei Erhaltung der erforderlichen Zuverlaessigkeit der Produktion, steigenden Anforderungen an Arbeitssicherheit und Umweltschutz. Ein Gesamtbetriebsfuehrungssystem, das sowohl die Produktionsfunktion, als auch die Erhaltungsfunktion abdeckt, wurde fuer Produktionsanlagen konzipiert. Fuer konventionelle Kraftwerke wurde die Entwicklung und Einfuehrung begonnen. Dieses System beruecksichtigt konsequent, dass bei der Betriebsfuehrung Daten und Informationen mit unterschiedlichen Eigenschaften zu verarbeiten sind. Waehrend die Prozessdaten hoch fluktuierende Daten sein koennen

  20. Knitted structures of endless fibers for gas cleaning. Pt. 2; Gestrickte Strukturen aus Endlosfasern fuer die Abgasreinigung. T. 2

    Energy Technology Data Exchange (ETDEWEB)

    Mayer, A.; Mayer, J.; Wintermantel, E.; Buck, A.; Schmidt, R.M.; Mattes, P.; Sudmanns, H.; Bressler, H.

    1995-07-01

    Knittings based on ceramic filament yarns can be used to clean polluted air and exhaust gas efficiently up to temperatures of 1000 C. They provide interesting properties for the filtration of Diesel particles as well as for catalysis and adsorption of toxic gas components. The special knitting technology can handle any brittle fibers, producing elastic structures, which are thermochoc-resistent and can therefore even be used for preturbo applications. The first part of this paper, published in MTZ 56 (1995) 2 deals with the basic properties of this cleaning medium. This second part concentrates on Diesel particulate trop applications. These new trap and catalyst concepts are under development by Buck/Bondorf with TTM/Niederrohrdorf. Basic research is delegated to ETH Zuerich and Universitaet by Gillet/Edenkoben and, with focus on preturbo-applications by MTU/Friedrichshafen. (orig.) [Deutsch] Gestricke aus keramischen Endlosfasern sind bis zu Temperaturen um 1000 C fuer die Abluft- und Abgasreinigung einsetzbar. Sie eignen sich fuer die Filtration von Dieselpartikeln, insbesondere deren Feinstfraktionen ebenso wie fuer die Katalyse und fuer die Adsorption gasfoermiger Schadstoffkomponenten. Die Strukturen sind volumenelastisch, unempfindlich gegen Thermoschock und daher auch im motornahen Bereich risikoarm einsetzbar. In einem ersten Teilbeitrag in der Februarausgabe der MTZ wurden grundlegende Erkenntnisse dieses Abgasreinigungsmediums beschrieben. Der vorliegende zweite Teil beschreibt Anwendungen mit Schwerpunkt Dieselpartikelfilter. Diese neue Fasertechnik wird bei Buck, Bondorf, zusammen mit TTM, Niderrohrdorf, entwickelt. Forschungsarbeiten werden an der ETH Zuerich und der Universitaet Erlangen im Rahmen des BMFT-Projektes 01 VQ 9305/9 durchgefuehrt. Fragen zu motornachgeschalteten Anwendungen untersucht Gillett, Edenkoben, Moeglichkeiten der Motorintegration solcher Filter die MTU Friedrichshafen. (orig.)

  1. In-EDTA as activable tracer in hydrogeological investigations

    International Nuclear Information System (INIS)

    Stanescu, S.P.; Gaspar, E.; Spiridon, S.; Farcasiu, O.M.; Catilina, R.

    1982-12-01

    Two experiments are presented, on the possibilities of the use of indium in the form of the In-EDTA complex, as an activable tracer for hydrogeological studies. The determination of indium concentrations in the sampled water has been carried out by using the coprecipitation of indium with bismuth hydroxide, the neutron activation at the VVR-S reactor of the Institute for Nuclear Physics and Engineering - Bucharest and the measurement on the 417.0 keV line of sup(116m)In with the Ge(Li) spectrometric device. The advantages of the utilization of In-EDTA as a tracer for marking large volumes of water and of some long transit waters (of the order of months) have resulted. (authors)

  2. Thiocyanate use as radioactive tracer in a petroleum field

    International Nuclear Information System (INIS)

    Pereira, Elaine Henriques Teixeira; Souza, Fabiane Ferreira de; Pinto, Amenonia Maria Ferreira; Moreira, Rubens Martins

    2002-01-01

    Currently, most of the oil exploration in reservoirs is made out if the assistance of the injection of different fluids, waters in particular, to increase production. For this reason it has been largely spread the application of chemical and/or radioactive tracers in the study of the characteristics of transport of the injected fluid between injection and production wells. K 35 SCN is considered a good tracer due to its higher solubility in water and low adsorption. This work presents a brief review of the methods described in literature for obtain S-35. It was found out to be the most appropriate method the synthesis of thiocyanate starting from the reaction of KCN and S-35. It was also investigated the efficiency of the reaction for the obtention of KSCN. (author)

  3. 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.

  4. Scintigraphy of inflammation with nanometer-sixed colloidal tracers

    International Nuclear Information System (INIS)

    De Schrijver, M.

    1989-01-01

    This book describes a novel approach to the scintigraphy of inflammatory processes of the extremities. It presents a method specially developed to bring this diagnostic modality whithin the reach of every nuclear medicine centre without requiring a special infrastructure or extensively trained personnel. The author revieuws the existing nuclear medicine techniques and critically analyses their relative advantages and pitfalls before proceeding to a detailed account of the use of a colloidal tracer for detecting and monitoring inflammation. The author identifies the pathophysiological basis of his concept and gives extensive preclinical data prior to discussing a number of comparative clinical studies with the new technique. Additional benefits are brought by the book's emphasis on the importance of a solid radiopharmacological foundation to the medically used tracers and demonstrates with a few suprising examples how shortcomings at this level may lead to misleading findings in the daily practive of nuclear medicine, even with routinely used radiopharmaceuticals. (author). refs.; figs.; tabs

  5. Primordial helium abundance determination using sulphur as metallicity tracer

    Science.gov (United States)

    Fernández, Vital; Terlevich, Elena; Díaz, Angeles I.; Terlevich, Roberto; Rosales-Ortega, F. F.

    2018-05-01

    The primordial helium abundance YP is calculated using sulphur as metallicity tracer in the classical methodology (with YP as an extrapolation of Y to zero metals). The calculated value, YP, S = 0.244 ± 0.006, is in good agreement with the estimate from the Planck experiment, as well as, determinations in the literature using oxygen as the metallicity tracer. The chemical analysis includes the sustraction of the nebular continuum and of the stellar continuum computed from simple stellar population synthesis grids. The S+2 content is measured from the near infrared [SIII]λλ9069Å, 9532Å lines, while an ICF(S3 +) is proposed based on the Ar3 +/Ar2 + fraction. Finally, we apply a multivariable linear regression using simultaneously oxygen, nitrogen and sulphur abundances for the same sample to determine the primordial helium abundance resulting in YP - O, N, S = 0.245 ± 0.007.

  6. Focuss algorithm application in kinetic compartment modeling for PET tracer

    International Nuclear Information System (INIS)

    Huang Xinrui; Bao Shanglian

    2004-01-01

    Molecular imaging is in the process of becoming. Its application mostly depends on the molecular discovery process of imaging probes and drugs, from the mouse to the patient, from research to clinical practice. Positron emission tomography (PET) can non-invasively monitor . pharmacokinetic and functional processes of drugs in intact organisms at tracer concentrations by kinetic modeling. It has been known that for all biological systems, linear or nonlinear, if the system is injected by a tracer in a steady state, the distribution of the tracer follows the kinetics of a linear compartmental system, which has sums of exponential solutions. Based on the general compartmental description of the tracer's fate in vivo, we presented a novel kinetic modeling approach for the quantification of in vivo tracer studies with dynamic positron emission tomography (PET), which can determine a parsimonious model consisting with the measured data. This kinetic modeling technique allows for estimation of parametric images from a voxel based analysis and requires no a priori decision about the tracer's fate in vivo, instead determining the most appropriate model from the information contained within the kinetic data. Choosing a set of exponential functions, convolved with the plasma input function, as basis functions, the time activity curve of a region or a pixel can be written as a linear combination of the basis functions with corresponding coefficients. The number of non-zero coefficients returned corresponds to the model order which is related to the number of tissue compartments. The system macro parameters are simply determined using the focal underdetermined system solver (FOCUSS) algorithm. The FOCUSS algorithm is a nonparametric algorithm for finding localized energy solutions from limited data and is a recursive linear estimation procedure. FOCUSS algorithm usually converges very fast, so demands a few iterations. The effectiveness is verified by simulation and clinical

  7. 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...

  8. Delayed appearance of tracer lead in facial hair

    International Nuclear Information System (INIS)

    Rabinowitz, M.; Wetherill, G.; Kopple, J.

    1976-01-01

    Three adult men were fed 204 Pb--a rare, stable isotope of lead--daily for about 100 days. Simultaneous blood and facial hair measurements of this tracer and of total lead concentrations were made by mass spectrometric isotope dilution analysis. Although the blood showed an immediate response to the intake of the tracer, the facial hair showed a more gradual response and a delay of approximately 35 days. Since the pattern of appearance of lead in hair does not appear to represent a simple time delay of blood lead concentration, the existence of a physiological pool of lead fed by the blood and giving rise to the content in hair is suggested. Hair lead values should therefore, be interpreted as the integral of the blood lead values over the mean life of this intermediate pool--about 100 days

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

    International Nuclear Information System (INIS)

    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

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

    International Nuclear Information System (INIS)

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

    2016-01-01

    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. (paper)

  11. Quantifying postfire aeolian sediment transport using rare earth element tracers

    Science.gov (United States)

    Dukes, David; Gonzales, Howell B.; Ravi, Sujith; Grandstaff, David E.; Van Pelt, R. Scott; Li, Junran; Wang, Guan; Sankey, Joel B.

    2018-01-01

    Grasslands, which provide fundamental ecosystem services in many arid and semiarid regions of the world, are undergoing rapid increases in fire activity and are highly susceptible to postfire-accelerated soil erosion by wind. A quantitative assessment of physical processes that integrates fire-wind erosion feedbacks is therefore needed relative to vegetation change, soil biogeochemical cycling, air quality, and landscape evolution. We investigated the applicability of a novel tracer technique—the use of multiple rare earth elements (REE)—to quantify soil transport by wind and to identify sources and sinks of wind-blown sediments in both burned and unburned shrub-grass transition zone in the Chihuahuan Desert, NM, USA. Results indicate that the horizontal mass flux of wind-borne sediment increased approximately threefold following the fire. The REE tracer analysis of wind-borne sediments shows that the source of the horizontal mass flux in the unburned site was derived from bare microsites (88.5%), while in the burned site it was primarily sourced from shrub (42.3%) and bare (39.1%) microsites. Vegetated microsites which were predominantly sinks of aeolian sediments in the unburned areas became sediment sources following the fire. The burned areas showed a spatial homogenization of sediment tracers, highlighting a potential negative feedback on landscape heterogeneity induced by shrub encroachment into grasslands. Though fires are known to increase aeolian sediment transport, accompanying changes in the sources and sinks of wind-borne sediments may influence biogeochemical cycling and land degradation dynamics. Furthermore, our experiment demonstrated that REEs can be used as reliable tracers for field-scale aeolian studies.

  12. Development of in-vessel source term analysis code, tracer

    International Nuclear Information System (INIS)

    Miyagi, K.; Miyahara, S.

    1996-01-01

    Analyses of radionuclide transport in fuel failure accidents (generally referred to source terms) are considered to be important especially in the severe accident evaluation. The TRACER code has been developed to realistically predict the time dependent behavior of FPs and aerosols within the primary cooling system for wide range of fuel failure events. This paper presents the model description, results of validation study, the recent model advancement status of the code, and results of check out calculations under reactor conditions. (author)

  13. Tracer studies of flotation in laboratory and plant

    International Nuclear Information System (INIS)

    Niemi, A.J.; Thereska, J.; Plasari, E.; Kacaj, M.

    1992-01-01

    Froth flotation is used for the industrial extraction of valuable minerals from ores. Its progress depends on the properties of minerals being processed and on flotation practices. While flotation is basically a kinetic process, it functions industrially in continuous flow vessels whose flow patterns influence the separation effected. Radioisotope tracers have proven to be a necessary tool in the acquisition of both kinetic and flow pattern data

  14. Tracer investigations of macroprocesses in mineral processing. 1

    International Nuclear Information System (INIS)

    Koch, P.

    1981-01-01

    Results obtained from tracer studies in mineral processing have been evaluated with regard to the effects of hydrodynamic and design parameters of the single cell on flotation kinetics, to the residence time in single and in series-connected cells, and to the possibility of designing process control models. An algorithm is given for technological interpretation of results obtained from residence time and process kinetics studies

  15. PC-based hardware and software for tracer measurements

    International Nuclear Information System (INIS)

    Kaemaeraeinen, V.J.; Kall, Leif; Kaeki, Arvo

    1990-01-01

    Cheap, efficient personal computers can be used for both measurement and analysis. The results can be calculated immediately after the measurements are made in order to exploit the real-time measuring capabilities of tracer techniques fully. In the analysis phase the measurement information is visualized using graphical methods. The programs are menu drive to make them easy to use and adaptable for field conditions. The measuring equipment is modular for easy installation and maintenance. (author)

  16. Hanford facilities tracer study report (315 Water Treatment Facility)

    International Nuclear Information System (INIS)

    Ambalam, T.

    1995-01-01

    This report presents the results and findings of a tracer study to determine contact time for the disinfection process of 315 Water Treatment Facility that supplies sanitary water for the 300 Area. The study utilized fluoride as the tracer and contact times were determined for two flow rates. Interpolation of data and short circuiting effects are also discussed. The 315 Water Treatment Facility supplies sanitary water for the 300 Area to various process and domestic users. The Surface Water Treatment Rule (SWTR), outlined in the 1986 Safe Drinking Water Act Amendments enacted by the EPA in 1989 and regulated by the Washington State Department of Health (DOH) in Section 246-290-600 of the Washington Administrative Code (WAC), stipulates filtration and disinfection requirements for public water systems under the direct influence of surface water. The SWTR disinfection guidelines require that each treatment system achieves predetermined inactivation ratios. The inactivation by disinfection is approximated with a measure called CxT, where C is the disinfectant residual concentration and T is the effective contact time of the water with the disinfectant. The CxT calculations for the Hanford water treatment plants were derived from the total volume of the contact basin(s). In the absence of empirical data to support CxT calculations, the DOH determined that the CxT values used in the monthly reports for the water treatment plants on the Hanford site were invalid and required the performance of a tracer study at each plant. In response to that determination, a tracer study will be performed to determine the actual contact times of the facilities for the CxT calculations

  17. Radioisotope tracer study in an aniline production reactor

    International Nuclear Information System (INIS)

    Pant, H.J.; Yelgoankar, V.N.; Mendhekar, G.N.

    1995-01-01

    A radioisotope tracer study was carried out in an aniline production reactor to investigate the cause of poor heat transfer from tube side to shell side in an aniline production (ANPO) reactor. The results of the study indicated that more than 50% of the shell volume was reduced due to deposition of the process material (i.e. fouling) on the shell walls and may be the cause of poor heat transfer in the reactor. (author). 2 refs., 2 figs

  18. Hanford 100-N Area Tracer Study Final Report

    International Nuclear Information System (INIS)

    Kretzschmar, S.P.; Bedi, G.S.; Martinez, P.; Ervin, K.

    1996-09-01

    This document provides an engineering tracer study final report for the determination of contact time for the disinfection process at Group A Nontransient Noncommunity water treatment plant for the 100- N Water Plant (located on the Hanford Site in Richland, Washington). The purpose of this study is to determine the actual detention time within the plant clearwell, and the disinfection contact time at several clearwell effluent flow rates

  19. The importance of tracer technology in combined borehole investigations

    International Nuclear Information System (INIS)

    Zojer, H.

    1998-01-01

    In an experimental field for a waste disposal site, investigations have been carried out applying methods from geology, hydrology hydrogeology, hydrochemistry, environmental isotope hydrology and tracer technology. All data obtained result to a dynamic drainage model of groundwater. The combined interpretation of borehole data guarantees a high-grade knowledge of groundwater exfiltrating to the surface drainage, which enables proper control measures of the disposal site and an effective groundwater protection. (author)

  20. Modelling tracer transport in fractured rock at Stripa

    International Nuclear Information System (INIS)

    Herbert, A.

    1992-01-01

    We present the results of a modelling study, making predictions for tracer transport experiments carried out within the H-zone feature in the Stripa mine. We use a direct fracture network approach to represent the system of interconnected flow-conducting fractures comprising this zone. It is a highly fractured granite, and our fracture-network models include up to 60000 fractures. We have had to develop efficient algorithms to calculate the flow and transport through these networks; these techniques are described and justified. The first stage of modelling addressed two saline injection experiments. The results of these were known to us and so in addition to 'predicting' the results of these experiments, we used them to calibrate a flow model of the experimental site. This model was then used to make true 'blind' predictions for a set of tracer experiments carried out in the natural head-field, caused by an open drift. Where our flow model was good, our predictions were found to be very accurate, explaining the dispersion in the tracer breakthrough in terms of the fracture network geometry. Discrepancies for experiments in less well characterised regions of the H-zone are presented, and we suggest that the errors in these predictions are a consequence of the inaccuracies of the flow-field. We have demonstrated the use of large-scale fracture network modelling. It has proved very successful, and made very accurate predictions of field experiments carried out at the Stripa mine. The measured dispersion of tracers can be accounted for by the geometry of the fracture network flow system. (14 refs.) (au)

  1. Waste tank ventilation rates measured with a tracer gas method

    International Nuclear Information System (INIS)

    Huckaby, J.L.; Evans, J.C.; Sklarew, D.S.; Mitroshkov, A.V.

    1998-08-01

    Passive ventilation with the atmosphere is used to prevent accumulation of waste gases and vapors in the headspaces of 132 of the 177 high-level radioactive waste Tanks at the Hanford Site in Southeastern Washington State. Measurements of the passive ventilation rates are needed for the resolution of two key safety issues associated with the rates of flammable gas production and accumulation and the rates at which organic salt-nitrate salt mixtures dry out. Direct measurement of passive ventilation rates using mass flow meters is not feasible because ventilation occurs va multiple pathways to the atmosphere (i.e., via the filtered breather riser and unsealed tank risers and pits), as well as via underground connections to other tanks, junction boxes, and inactive ventilation systems. The tracer gas method discussed in this report provides a direct measurement of the rate at which gases are removed by ventilation and an indirect measurement of the ventilation rate. The tracer gas behaves as a surrogate of the waste-generated gases, but it is only diminished via ventilation, whereas the waste gases are continuously released by the waste and may be subject to depletion mechanisms other than ventilation. The fiscal year 1998 tracer studies provide new evidence that significant exchange of air occurs between tanks via the underground cascade pipes. Most of the single-shell waste tanks are connected via 7.6-cm diameter cascade pipes to one or two adjacent tanks. Tracer gas studies of the Tank U-102/U-103 system indicated that the ventilation occurring via the cascade line could be a significant fraction of the total ventilation. In this two-tank cascade, air evidently flowed from Tank U-103 to Tank U-102 for a time and then was observed to flow from Tank U-102 to Tank U-103

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

    International Nuclear Information System (INIS)

    Langer, Oliver; Halldin, Christer

    2002-01-01

    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-[ 18 F]fluorodopamine, (-)-6-[ 18 F]fluoronorepinephrine and (-)-[ 11 C]epinephrine, and radiolabelled catecholamine analogues, such as [ 123 I]meta-iodobenzylguanidine, [ 11 C]meta-hydroxyephedrine, [ 18 F]fluorometaraminol, [ 11 C]phenylephrine and meta-[ 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 (-)-[ 18 F]fluoroethoxybenzovesamicol display a high degree of non-specific binding in myocardium which restricts their utility for cardiac neuronal imaging. (orig.)

  3. Lead-free sliding overplate for highly loaded big end bearings; Bleifreie Laufschicht fuer hochbelastete Haupt- und Pleuellager

    Energy Technology Data Exchange (ETDEWEB)

    Graham, N.; Schnell, L.; Arnold, G. [Federal-Mogul Wiesbaden GmbH and Co. KG (Germany)

    2003-10-01

    Lead has always been an important metal in plain bearing technology. Completely lead-free solutions for high-end engine applications are still not considered to be technically achievable. Therefore, the European End of Life Directive (2000/53/EC), which took effect on 1 July 2003, lists copper-based lead/bronze bearings as an exception. The bearing group of Federal-Mogul has now announced its exit from the lead industry and addresses the issue layer by layer. A recently introduced adaptive bearing offers a lead-free overplate for high-performance internal combustion engine applications. This new bearing changes its technical characteristics during the running-in phase. (orig.) [German] Blei war schon immer eine wichtige Komponente in der Gleitlagertechnik. Bis heute gelten vollstaendig bleifreie Loesungen fuer hochbelastete Gleitlager als technisch nicht machbar. Deshalb nennt die europaeische Altautoverordnung (2000/53/EG), die seit dem 1. Juli 2003 in Kraft ist, als Ausnahme die kupferbasierten Bleibronzelager. Die Gleitlagergruppe von Federal-Mogul hat jetzt ihren Rueckzug aus der Verarbeitung von Blei angekuendigt und geht das Thema Schicht fuer Schicht an. Ein kuerzlich eingefuehrtes, anpassungsfaehiges Lager fuer High-End-Verbrennungsmotoren verfuegt ueber eine bleifreie Laufschicht. Bei diesem neuen Lager veraendern sich die technischen Eigenschaften waehrend der Einlaufphase. (orig.)

  4. Combined expander-compressor for carbon dioxide in free piston design; Kombinierte Expansions-Kompressions-Maschine fuer Kohlendioxid in Freikolbenbauweise

    Energy Technology Data Exchange (ETDEWEB)

    Heyl, P.; Quack, H. [TU, Dresden (Germany). Lehrstuhl fuer Kaelte- und Kryotechnik; Kuehne, M. [TU, Dresden (Germany). Lehrstuhl fuer Pumpen, Verdichter und Apparate

    2000-03-01

    The renaissance of carbon dioxide in refrigeration engineering is impressive. The contribution shows that the disadvantages of this refrigerating fluid can be compensated by modifying the refrigeration circuit. A combined expander-compressor working by the free piston principle and developed at Dresden Technical University is described. [German] Kohlendioxid erlebt im Bereich der Kaeltetechnik infolge der schwierigen Suche nach umweltvertraeglichen Ersatzkaeltemitteln fuer die Fluorchlorkohlenwasserstoffe eine beeindruckende Renaissance. Es soll anhand thermodynamischer Prozessberechnungen gezeigt werden, dass durch die Modifikation des Kreisprozesses unter Beachtung der besonderen thermodynamischen Eigenschaften des Kohlendioxids diese Nachteile bereits bei der theoretischen Leistungszahl ausgeglichen werden koennen. Dafuer wird das Kohlendioxid in einem Prozess mit zweistufiger Verdichtung arbeitsleistend entspannt. Die Besonderheit dieses Prozesses ist die Verwendung einer speziell fuer diesen Anwendungsfall entwickelten Maschine, die die gewonnene Expansionsarbeit direkt fuer die Verdichtung des Kohlendioxids in der zweiten Verdichtungsstufe nutzt. Es handelt sich dabei um eine nach dem Freikolbenprinzip arbeitende Expansions-Kompressions-Maschine, die an der TU Dresden entwickelt und gegenwaertig getestet wird. (orig.)

  5. First robotized assembly line in for multivalve cylinder heads in Europe; Erste roborterautomatisierte Montagelinie fuer Mehrventilzylinderkoepfe in Europa

    Energy Technology Data Exchange (ETDEWEB)

    Simonis, G. [ABB Flexible Automation GmbH, Langenfeld (Germany)

    1996-12-31

    From its earliest days the automotive industry has pioneered the automation of factory operations. This reputation is being added to by yet another new development in the assembly area. The trendsetter is ABB Flexible Automation GmbH, based in Butzbach, Germany, which has developed a future-oriented concept for vehicle engine assembly in which jointed-arm robots play a key role. The new concept has been adopted for Europe`s first robotized assembly line for multivalve cylinder heads, installed by ABB for the German carmaker Audi in Gyoer, Hungary. (orig.) [Deutsch] Die Automobilindustrie war und ist Vorreiter in der Automatisierung betrieblicher Ablaeufe. Einmal mehr zeigt sich dies im Montagebereich. Trendsetter ist hier die ABB Flexible Automation GmbH, Butzbach/Deutschland, die fuer die Montage von Fahrzeugaggregaten ein zukunftweisendes Konzept entwickelt hat. Gelenkarmroboter spielen dabei eine entscheidende Rolle. Ein Beispiel dafuer: Die erste roboterautomatisierte Montageanlage fuer Mehrventilzylinderkoepfe in Europa, die ABB fuer den Automobilhersteller Audi im ungarischen Gyoer realisiert hat. (orig.)

  6. 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)

  7. Utilization scenarios for driving support systems in cargo traffic and their evaluation; Einsatzszenarien fuer Fahrerassistenzsysteme im Gueterverkehr und deren Bewertung

    Energy Technology Data Exchange (ETDEWEB)

    Henning, K.; Preuschoff, E. (eds.)

    2003-07-01

    The report presents a summary of the project of the above title (EFAS project). While earlier projects focused on the technical side, EFAS is the first to present a systematic analysis, presentation and evaluation of the parameters influencing driving support systems. With the aid of a systemic analysis, the key influencing factors are defined and analyzed, and three scenarios are developed which take account of user-oriented, organizational, operational, technical, infrastructural and legal aspects. The scenarios are evaluated with the aid of driving and traffic simulations in the fields of humans, organization and technology, and actions are recommended on this basis for driving support systems in cargo transport. [German] Der Bericht fasst die Ergebnisse des Projektes ''Einsatzszenarien fuer Fahrerassistenzsysteme im Gueterverkehr'' (EFAS) zusammen. Bisher wurde die Thematik Fahrerassistenzsysteme hauptsaechlich auf der Seite der Fahrzeugtechnik vorangetrieben. Das Projekt EFAS stellt nun zum ersten Mal eine umfassende Analyse, Darstellung und Bewertung dar. Mit Hilfe einer systemischen Analyse werden die wesentlichen Einflussfaktoren fuer die Einbindung von Fahrerassistenzsystemen in das Gesamtsystem ''Verkehr'' bestimmt und untersucht. Hieraus werden drei Einsatzszenarien entwickelt, die nutzerbezogene, organisatorische, betriebliche, fahrzeugtechnische, infrastukturelle und rechtliche Aspekte zu Zukunftsbildern zusammenfuegen. Die Szenarien werden mit Hilfe von Fahr- und Verkehrssimulationen in den Bereichen Mensch, Organisation und Technik bewertet. Aus den Ergebnissen werden konkrete Handlungsempfehlungen fuer den Einsatz von Fahrerassistenzsystemen im Strassengueterverkehr abgeleitet. (orig.)

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

    International Nuclear Information System (INIS)

    Chagas, Claudio Jose; Ferreira, Vinicius Verna Magalhaes; Fonseca, Raquel Luisa Mageste; Rocha, Zildete; Moreira, Rubens Martins; Lemos, Nayron Cosme; Menezes, Angela de Barros Correia; Santos, Talita Oliveira

    2015-01-01

    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, 222 Rn, noble gas derived from natural sources, been found in all underground waters, as a product of radioactive decay of the 226 Ra. This gas can be found in the air, water, rocks or soil. In this paper, the 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 222 Rn measurements at Fundao stream were carried out using the equipment RAD 7. The results showed that 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)

  9. 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)

  10. 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

  11. Tritium as tracer of flow in constructed wetlands

    International Nuclear Information System (INIS)

    Wachniew, P.; Czuprynski, P.; Maloszewski, P.

    2005-01-01

    Constructed wetlands technology is a cost-effective and environmentally friendly method used world-wide to treat waste waters of different origins. The soluble pollutants are transformed and removed mainly through the processes that occur at surfaces of plants, plant debris or filtering media. The efficiency of soluble pollutants removal is thus primarily related to the extent of contact between waste waters and the reactive surfaces. Residence time distributions function (RTD)is basic characteristic of wetland hydraulic properties and can be obtained by combined use of tracer technique and mathematical modelling. Tritium was used as to obtain RTD's of three parallel cells of a sub-surface flow constructed wetland overgrown with Pharagmites australis in Nowa Slupia. Tritium as a part of water molecule, is an ideal tracer of flow in the highly reactive environment of constructed wetlands. Results of the tracer test interpreted by the assumed model (Multi Flow Dispersion Model) of conservative solute transport revealed a complex structure of flow through the wetland. (author)

  12. Radiolabeled cypoxic cell sensitizers: tracer for assessment of ischemia

    International Nuclear Information System (INIS)

    Mathias, C.J.; Welch, M.J.; Kilbourn, M.R.; Jerabek, P.A.; Patrick, T.B.; Raichle, M.E.; Krohn, K.A.; Rasey, J.S.; Shaw, D.W.

    1987-01-01

    Hypoxic, non-functional, but viable, tissue may exist in heart and brain following an arterial occlusion. Identification of such tissue in vivo is crucial to the development of effective treatment strategies. It has been suggested that certain compounds capable of sensitizing hypoxic tumor cells to killing by x-rays (i.e., misonidazole) might serve as in vivo markers of hypoxic tissue in ischemic myocardium or brain if properly radiolabeled. To this end the authors have radiolabeled two fluorinated analogs of nitroimidazole based hypoxic cell sensitizers with the 110 minute half-lived positron-emitting fluorine-18. The ability of these tracers to quantitate the presence of hypoxic tissue has been studied in a gerbil stroke model. The in vivo uptake of one of these tracers [F-18]-fluoronormethyoxymisonidazole is dependent on the extent of tissue hypoxia, and thus, appears to have potential as a diagnostic indicator of non-functional but viable tissue when the tracer is used in conjunction with positron emission tomography. 80 references, 2 figures, 1 table

  13. Discrete fracture modelling for the Stripa tracer validation experiment predictions

    International Nuclear Information System (INIS)

    Dershowitz, W.; Wallmann, P.

    1992-02-01

    Groundwater flow and transport through three-dimensional networks of discrete fractures was modeled to predict the recovery of tracer from tracer injection experiments conducted during phase 3 of the Stripa site characterization and validation protect. Predictions were made on the basis of an updated version of the site scale discrete fracture conceptual model used for flow predictions and preliminary transport modelling. In this model, individual fractures were treated as stochastic features described by probability distributions of geometric and hydrologic properties. Fractures were divided into three populations: Fractures in fracture zones near the drift, non-fracture zone fractures within 31 m of the drift, and fractures in fracture zones over 31 meters from the drift axis. Fractures outside fracture zones are not modelled beyond 31 meters from the drift axis. Transport predictions were produced using the FracMan discrete fracture modelling package for each of five tracer experiments. Output was produced in the seven formats specified by the Stripa task force on fracture flow modelling. (au)

  14. Five channel data acquisition system for tracer studies

    International Nuclear Information System (INIS)

    Narender Reddy, J.; Dhananjay Reddy, Y.; Dheeraj Reddy, J.

    2001-01-01

    Radioactive tracers are being used by many modern industries for trouble shooting, process control/quality control and optimization in the process plants. A five channel data acquisition system which has five independent scintillation detector based channels for data acquisition has been developed and made available. This system can be used for tracer studies involving Mean residence time, Resident time distribution and other similar parameters involving tracer movement. System developed can acquire data with dwell times ranging from 10 m sec to 100 sec into each channel and has a capacity to acquire data into 10K channels. Each channel electronics, has a 1x1 NaI Scintillation Detector probe, HV, AMP SCA, micro-controller based data acquisition card with independent dot matrix LCD display for visualization. Extensive use of serial bus (I 2 C, microwire) compatible devices has been incorporated in the design. Data acquisition is initiated simultaneously into all the channels. System design permits delayed/prompt data acquisition selectively. Dual counter switching technique has been employed to achieve faster dwell times for data acquisition. (author)

  15. Tracer Equivalent Latitude: A Diagnostic Tool for Isentropic Transport Studies.

    Science.gov (United States)

    Allen, Douglas R.; Nakamura, Noboru

    2003-01-01

    Area equivalent latitude based on potential vorticity (PV) is a widely used diagnostic for isentropic transport in the stratosphere and upper troposphere. Here, an alternate method for calculating equivalent latitude is explored, namely, a numerical synthesis of a PV-like tracer from a long-term integration of the advection-diffusion equation on isentropic surfaces. It is found that the tracer equivalent latitude (TrEL) behaves much like the traditional PV equivalent latitude (PVEL) despite the simplified governing physics; this is evidenced by examining the kinematics of the Arctic lower stratospheric vortex. Yet in some cases TrEL performs markedly better as a coordinate for long-lived trace species such as ozone. These instances include analysis of lower stratospheric ozone during the Stratospheric Aerosol and Gas Experiment (SAGE) III Ozone Loss and Validation Experiment (SOLVE) campaign and three-dimensional reconstruction of total column ozone during November-December 1999 from fitted ozone-equivalent latitude relationship. It is argued that the improvement is due to the tracer being free from the diagnostic errors and certain diabatic processes that affect PV. The sensitivity of TrEL to spatial and temporal resolution, advection scheme, and driving winds is also examined.

  16. Quantitative measurement of maritime sediment movement using radioactive tracers

    International Nuclear Information System (INIS)

    Makovski, E.; Grissener, G.

    1967-01-01

    The quantitative method described in the paper involves burying appropriate detectors over a given area of the sea bottom, the detectors being connected to recording equipment which is itself buried in the sediment or situated on the shore. Detectors arranged in this way are covered by a certain layer of radioactive sediment whose activity is proportional to its mass. Before the labelled sediments are removed, their initial activity is measured, and then, as the covering is removed, measurements are made of the gradual decrease in activity corresponding to loss of the surface layer of the bottom deposit area under investigation, expressed in g/cm 2 . The tracers used in the investigations discussed were natural ones such as sea with 31 Si and artificial ones such as activated fragments of sodium glass (with a 6.5% admixture of Fe 2 O 3 ) with 24 Na . The proportional dependence of activity on mass has been confirmed for both tracers; this is an essential point for a tracer intended for quantitative measurements. This proportionality is very well maintained if a sample of highly active sediment is introduced into a large mass of inactive sediments (10 -2 - 10 -3 ). The concluding section describes the advantages of this method as a possible way of using radioisotopes with a short half-life and a low total activity of the order of a few millicuries. (author)

  17. Use of Helium-3 and Tritium tracers in oceanography

    International Nuclear Information System (INIS)

    Andrie, Chantal

    1987-01-01

    As tritium considered as a transient tracer has become one of the most promising tool for the study of oceanic circulation and of the ocean capacity to absorb anthropogenic carbon, and as the simultaneous use of its radioactive descendant, Helium-3, brings an additional information (together, these tracers build up a clock in the study of water masses), and as all helium-3 and tritium measurements are made by mass spectroscopy, this research thesis addresses the analytical process, the detection limit, and the method reproducibility associated with this use of both tracers. The author reports and discusses helium-3 data obtained during a measurement campaign which allowed the localisation of an active source and the evidence of an intermediate back current, and tritium data obtained during another measurement campaign which allowed the description of the high time variability of convection processes, and an assessment of water renewal delays and of some deep water circulations. He also reports and discusses the simultaneous use of helium-3 data and tritium data to localize areas where convection processes occur. A theoretical approach to this simultaneous use is proposed which uses a mixing model which distinguishes the venting transit time. Measurement campaigns were performed in Red Sea, western Mediterranean Sea, and north-eastern Atlantic Ocean [fr

  18. Synthesis of tracers using automated radiochemistry and robotics

    International Nuclear Information System (INIS)

    Dannals, R.F.

    1992-07-01

    Synthesis of high specific activity radiotracers labeled with short-lived positron-emitting radionuclides for positron emission tomography (PET) often requires handling large initial quantities of radioactivity. High specific activities are required when preparing tracers for use in PET studies of neuroreceptors. A fully automated approach for tracer synthesis is highly desirable. This proposal involves the development of a system for the Synthesis of Tracers using Automated Radiochemistry and Robotics (STARR) for this purpose. While the long range objective of the proposed research is the development of a totally automated radiochemistry system for the production of major high specific activity 11 C-radiotracers for use in PET, the specific short range objectives are the automation of 11 C-methyl iodide ( 11 CH 3 I) production via an integrated approach using both radiochemistry modular labstations and robotics, and the extension of this automated capability to the production of several radiotracers for PET (initially, 11 C-methionine, 3-N-[ 11 C-methyl]spiperone, and [ 11 C]-carfentanil)

  19. 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)

  20. Short and long term supply curves for crude oil and the consequences for the market; Kurz- und langfristige Angebotskurven fuer Rohoel und die Konsequenzen fuer den Markt

    Energy Technology Data Exchange (ETDEWEB)

    Schlothmann, Daniel

    2016-03-08

    In this work, supply curves for 22 major oil producing countries were identified and then aggregated into global supply curves. According to the identified supply curves, almost all oil-producing oil projects currently under development in the study countries are also profitable at the current oil price of $ 35 to $ 40 per barrel, taking short-term marginal costs into account. However, if the price of oil remains at this level in the coming years, a supply bottleneck on the global oil market will occur until 2024, as the development of cost-intensive, unconventional deposits and of deposits in deep and very deep waters is necessary to meet future demand. In order to avoid such a supply bottleneck by 2024, an oil price of at least US $ 80 per barrel is required, according to the long-term market equilibrium determined. [German] In dieser Arbeit wurden Angebotskurven fuer 22 bedeutende Oelfoerderlaender ermittelt und anschliessend zu globalen Angebotskurven aggregiert. Gemaess den ermittelten Angebotskurven sind nahezu alle gegenwaertig in der Foerderphase befindlichen Oelprojekte in den Untersuchungslaendern auch beim aktuellen Oelpreis von 35 bis 40 US-$ je Barrel unter Beruecksichtigung der kurzfristigen Grenzkosten rentabel. Sollte der Oelpreis jedoch in den kommenden Jahren auf diesem Niveau verharren, wird es bis zum Jahr 2024 zu einem Angebotsengpass auf dem globalen Oelmarkt kommen, da zur Deckung der zukuenftigen Nachfrage die Erschliessung kostenintensiver, unkonventioneller Lagerstaetten und von Lagerstaetten in tiefen und sehr tiefen Gewaessern notwendig ist. Damit es bis zum Jahr 2024 nicht zu einem solchen Angebotsengpass kommt, ist gemaess des ermittelten langfristigen Marktgleichgewichts ein Oelpreis von mindestens 80 (2014er) US-$ je Barrel notwendig.

  1. Process Analysis in Chemical Plant by Means of Radioactive Tracers

    Energy Technology Data Exchange (ETDEWEB)

    Hirayama, T.; Hamada, K.; Osada, K. [Showa Denko K.K., Tokyo (Japan)

    1967-06-15

    Following the movement of solids and fluids is important in chemical processes to determine mixing efficiency and residence time. Since it is necessary to follow many complex substances such as raw materials, intermediates and reactants in plant investigations, it is often necessary to ascertain whether the behaviour of the radioisotope tracer and the substance to be traced are identical. The most difficult problem is to determine the best method of labelling, a factor which is a substantial key to the success of an experiment. Usually, there are three labelling techniques: radioisotope labelling, pre-.activation of the material and post-activation of the material. This paper deals with practical examples of the double-tracer technique, a combination of conventional radioisotope labelling and post-activation methods by means of activation analysis. In process analysis by means of tracers, a practical measurement method should also be devised and developed for each experiment. Phosphorus-32 and gold (non-radioactive) were used to measure retention time in a carbon-black plant. The radioisotope was pumped into a feed-stock pipe positioned before the reactor and samples were taken from each process of the plant, including the bag filter, mixer and product tank. After sampling from each step of the process, {sup 32}P in a semi-infinite powder sample was measured in situ by beta counting, and the gold was measured by gamma counting after activating the sample in a reactor. The experiment showed that both tracers had the same residence time, which was shorter than expected. Useful data were also obtained from the dispersion pattern of the material flow for future operation controls, including the time required to change from one grade of product to another. Practical tracer techniques to measure mixing characteristics in high-speed gas flows using {sup 85}Kr have been developed. A study of the measurement method was conducted by calculating the differential values of

  2. Tracer experiment by using radioisotope in surface water environment

    International Nuclear Information System (INIS)

    Suh, K.S.; Kim, K.C.; Chun, I.Y.; Jung, S.H.; Lee, C.W.

    2007-01-01

    Complete text of publication follows. 1. Objective An expansion of industrial activities and urbanization result in still increasing amount of pollutants discharged into surface water. Discharged pollutants in surface water have harmful effects on the ecology of a river system and human beings. Pollutants discharged into surface water is transported and dispersed under conditions characteristic to particular natural water receiver. Radiotracer method is a useful tool for monitoring the pollutant dispersion and description of mixing process taking place in natural streams. A tracer experiment using radioisotope was carried out to investigate the characteristics of a pollutant transport and a determination of the diffusion coefficients in a river system. 2. Methods The upper area of the Keum river was selected for the tracer experiment, which is located in a mid west of Korea. The measurements of the velocity and bathymetry before a tracer experiment were performed to select the sampling lines for a detection of the radioisotope. The radioisotope was instantaneously injected into a flow as a point source by an underwater glass-vial crusher. The detection was made with 60 2inch NaI(Tl) scintillation detectors at 3 transverse lines at a downstream position. The multi-channel data acquisition systems were used to collect and process the signals transmitted from the detectors. Two-dimensional numerical models were used to simulate the hydraulic parameters and the concentration distributions of the radioisotope injected into the river. 3. Results and Conclusion The calculated results such as velocity and concentrations were compared with the measured ones. The dispersion characteristics of the radioisotope were analyzed according to a variation of the flow rate, water level and diffusion coefficients. Also, the diffusion coefficients were calculated by using the measured concentrations and the coefficients obtained from the field experiment were compared with the ones

  3. 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

  4. Development of a concept for sustainable agriculture in the Elbe wetlands of Niedersachsen; Konzeptentwicklung fuer eine nachhaltige Landbewirtschaftung in den niedersaechsischen Elbtalauen

    Energy Technology Data Exchange (ETDEWEB)

    Prueter, J. [Alfred Toepfer Akademie fuer Naturschutz (NNA), Schneverdingen (Germany); Horlitz, T.; Sander, A. [Arbeitsgemeinschaft Umweltplanung (ARUM), Hannover (Germany)

    2000-07-01

    Since late 1997, a cooperative project headed by Alfred Toepfer Akademie fuer Naturschutz has been investigating ''Models of conservation and its application in agriculture - goals, instruments and cost of sustainable, environment-friendly agriculture in the Elbe river valley in Niedersachsen''. The project receives funds in the context of the BMBF project ''Elbe river ecology''. Using the specific methods and tools of ecology, landscaping, agriculture and economics, the fundamentals for future interdisciplinary landscape development concepts will be established. The contribution presents the methodology of concept development and some exemplary goals for sustainable agricultural development in the context of the project. [German] Seit Ende 1997 widmet sich im Rahmen der BMBF-Forschungsfoerderung ''Elbe-Oekologie'' ein Verbundforschungsvorhaben unter Federfuehrung der Alfred Toepfer Akademie fuer Naturschutz dem Thema ''Leitbilder des Naturschutzes und deren Umsetzung mit der Landwirtschaft - Ziele, Instrumente und Kosten einer umweltschonenden und nachhaltigen Landwirtschaft im niedersaechsischen Elbetal''. Mit den spezifischen Methoden und fachlichen Instrumenten der Oekologie, der Landschaftsplanung sowie der Agrarwissenschaften einschliesslich Oekonomie sollen Grundlagen fuer moegliche ressortuebergreifend getragene Konzepte fuer die zukuenftige Landschaftsentwicklung erarbeitet werden. Im folgenden werden methodische Grundlagen der Konzeptentwicklung und beispielhafte Zielaussagen fuer eine nachhaltige Landbewirtschaftung aus dem laufenden Projekt vorgestellt. (orig.)

  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. Development of activable tracers for application in secondary recovering in petroleum reservoirs

    International Nuclear Information System (INIS)

    Martins, Polyana Fabricia Fernandes; Moreira, Rubens Martins . Servico de Meio Ambiente e Tecnicas Nucleares.

    2007-01-01

    Nuclear methods are instrumental in describing detailed flow patterns and other features of oil reservoirs that are unattainable to other methods. Tracer studies in oil fields are performed in a net of injection and producing wells. Thus, the use of only one tracer species would not discriminate the contributions of distinct injection wells to the output of a given production well. Hence, a multi-tracer experiment is required, and the use of activable tracers, capable of being measured by neutron activation analysis (NAA) is here proposed. As additional tracer choices lanthanum (La) and europium (Eu) were chosen from the rare earth series due to their large neutron cross sections and general availability. In order to decrease losses to the oil phase and the retardation of the tracer relatively to the aqueous phase, these elements were complexed with organic chelating ligands: the polyaminocarboxylic acids EDTA, DTPA and DOTA. Infrared spectrometry was used to check complexation. In order to check the partition of the tracer between the aqueous and organic phases, tests were carried stirring the two phases together and measuring the tracer concentrations in the aqueous phase; the partition coefficient (Kao) was then calculated for all the combinations of the two lanthanides and the three ligands. Tests in which the tracer was continuously pumped through reservoir rock samples were also carried out using tritiated water as a reference tracer and the complexed lanthanides. (author)

  7. 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.

  8. Tracer simulation using a global general circulation model: Results from a midlatitude instantaneous source experiment

    International Nuclear Information System (INIS)

    Mahlman, J.D.; Moxim, W.J.

    1978-01-01

    An 11-level general circulation model with seasonal variation is used to perform an experiment on the dispersion of passive tracers. Specially constructed time-dependent winds from this model are used as input to a separate tracer model. The methodologies employed to construct the tracer model are described.The experiment presented is the evolution of a hypothetical instantaneous source of tracer on 1 Janaury with maximum initial concentration at 65 mb, 36 0 N, 180 0 E. The tracer is assumed to have no sources or sinks in the stratosphere, but is subject to removal processes in the lower troposphere.The experimental results reveal a number of similarities to observed tracer behavior, including the average poleward-downward slope of mixing ratio isopleths, strong tracer gradients across the tropopause, intrusion of tracer into the Southern Hemisphere lower stratosphere, and the long-term interhemispheric exchange rate. The model residence times show behavior intermediate to those exhibited for particulate radioactive debris and gaseous C 14 O 2 . This suggests that caution should be employed when either radioactive debris or C 14 O 2 data are used to develop empirical models for prediction of gaseous tracers which are efficiently removed in the troposphere.In this experiment, the tracer mixing ratio and potential vorticity evolve to very high correlations. Mechanisms for this correlation are discussed. The zonal mean tracer balances exhibit complex behavior among the various transport terms. At early stages, the tracer evolution is dominated by eddy effects. Later, a very large degree of self-cancellation between mean cell and eddy effects is observed. During seasonal transitions, however, this self-cancellation diminishes markedly, leading to significant changes in the zonal mean tracer distribution. A possible theoretical explanation is presented

  9. 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

  10. 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

  11. 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.)

  12. 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.)

  13. Granular controls on the dispersion of bed load tracers

    Science.gov (United States)

    Jerolmack, D. J.; Martin, R. L.; Phillips, C. B.

    2014-12-01

    Coarse particles are transported in a river as bed load, i.e., they move in frequent contact with and are supported by the granular bed. This movement is typically intermittent and may be described by a series of steps are rests, the distributions of which determine particle dispersion. Laboratory and field studies of bed load tracer dispersion have reported sub- and super-diffusive behavior, both of which have been successfully reproduced with stochastic transport models. Although researchers have invoked heavy-tailed step lengths as the cause of anomalous dispersion, most observations report thin-tailed distributions. Little attention has been paid to rest periods, and stochastic transport models have not been connected to the underlying mechanics of particle motion. Based on theoretical and experimental evidence, we argue that step lengths are thin-tailed and do not control the longterm dispersion of bed load tracers; they are determined by momentum balance between the fluid and solid. Using laboratory experiments with both marbles and natural sediments, we demonstrate that the rest time distribution is power law, and argue that this distribution controls asymptotic dispersion. Observed rest times far exceed any hydrodynamic timescale. Experiments reveal that rest times of deposited particles are governed by fluctuations in river bed elevation; in particular, the return time for the bed to scour to the base of a deposited particle. Stochastic fluctuations in bed elevation are describable by an Ornstein-Uhlenbeck (mean-reverting random walk) model that contains two parameters, which we show are directly related to the granular shear rate and range of bed elevation fluctuations, respectively. Combining these results with the theory of asymmetric random walks (particles only move downstream), we predict superdiffusive behavior that is in quantitative agreement with our observations of tracer dispersion in a natural river.

  14. Double tracer experiments to evaluate atmospheric transport and dose models

    International Nuclear Information System (INIS)

    Nielsen, S.P.; Gryning, S.-E.; Thykier-Nielsen, S.; Karlberg, O.; Lyck, E.

    1986-05-01

    Two tracers, sulphurhexafluoride (SF 6 ) and radioactive noble gases, were released simultaneously from a 110-m stack and detected downwind at distances of 3-4 km. The experiments were made at the Swedish nuclear power plant Ringhals in 1981. The radioactive tracer was routine emissions from unit 1 (BWR). The one-hour measurements yielded crosswind profiles at ground level of SF 6 -concentrations and of gamma radiation from the plume. The measured profiles were compared to profiles calculated with computer models. The comparison showed that the models sometimes underestimate and sometimes overestimate the results, which seems to indicate that the models within their limited accuracy yield unbiased results. The ratios between measured and calculated values range from 0.2 to 3. The measurements revealed a surplus of gamma radiations from the noble gas daughters compared to those from the gases. This was interpreted as due to ground desposition and the estimated deposition velocities range from 2 to 10 cm/s. The meteorological conditions were monitored from a 100-m meteorological tower and from an 11-m mast. Measurements were made of wind speed, wind direction, and temperatures at different heights, and during each experiment a mini-radiosonde was released giving information on a possible inversion layer. The SF 6 -tracer was injected to the stack prior to the experiments. Air-samples were collected downwind in plastic bags by radio-controlled sampling units. The SF 6 -concentrations in the bags were determined with gas chromatography. Measurements of the gamma radiation from the plume were made with ionisation chambers and GM-counters. Furthermore, a few mobile gamma spectrometers were available giving information on the unscattered gamma radiation, thereby permitting identification of the radioactive isotopes. The work was partly financed by the Nuclear Safety Board of the Swedish Utilities and by the Danish association of utilities in Jutland and on Funen, Elsam

  15. Natural tracer profiles across argillaceous formations: the Claytrac project

    International Nuclear Information System (INIS)

    Mazurek, M.; Alt-Epping, P.; Gimi, Th.; Niklaus Waber, H.; Bath, A.; Gimmi, Th.

    2009-01-01

    Disposal of high-level radioactive waste and spent nuclear fuel in engineered facilities, or repositories, located deep underground in suitable geological formations is being developed worldwide as the reference solution to protect humans and the environment both now and in the future. An important aspect of assessing the long-term safety of deep geological disposal is developing a comprehensive understanding of the geological environment in order to define the initial conditions for the disposal system as well as to provide a sound scientific basis for projecting its future evolution. The transport pathways and mechanisms by which contaminants could migrate in the surrounding host rock are key elements in any safety case. Relevant experiments in laboratories or underground test facilities can provide important information, but the challenge remains in being able to extrapolate the results to the spatial and temporal scales required for performance assessment, which are typically tens to hundreds of metres and from thousands to beyond a million years into the future. Profiles of natural tracers dissolved in pore water of argillaceous rock formations can be considered as large-scale and long-term natural experiments which enable the transport properties to be characterised. The CLAYTRAC Project on Natural Tracer Profiles Across Argillaceous Formations was established by the NEA Clay Club to evaluate the relevance of natural tracer data in understanding past geological evolution and in confirming dominant transport processes. Data were analysed for nine sites to support scientific understanding and development of geological disposal. The outcomes of the project show that, for the sites and clay-rich formations that were studied, there is strong evidence that solute transport is controlled mainly by diffusion. The results can improve site understanding and performance assessment in the context of deep geological disposal and have the potential to be applied to other

  16. 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

  17. Can radiocaesium be used as a tracer for vegetal nutrients?

    International Nuclear Information System (INIS)

    Anjos, R. M.; Mosquera, B.; Carvalho, C.; Sanches, N.; Bastos, J.; Macario, K.; Vezzone, M.; Gomes, P.R.S.

    2007-01-01

    In recent years, there has been a growing interest in the evaluation of nutrient fluxes and radioactive contaminants in forest and agricultural ecosystems. Several studies on forest ecosystems have been carried out, mostly in Europe, after the Chernobyl accident. These studies have been performed mainly in the development of models for predicting the radiocaesium behavior in the soil and plant compartments of forest systems. However, research on the use of radiocaesium as a tracer for vegetal nutrients has shown that, despite the fact that caesium is a weakly hydrated alkaline metal and has chemical similarities to potassium and ammonium, this is still a complex problem requiring, then, more experimental results. Additionally, very little is known about the mechanisms involved in the radionuclide uptake and retention by tropical plants. In order to contribute to the understanding of the relative behavior of caesium, potassium and ammonium and to investigate whether radiocaesium can be used as a tracer for vegetal nutrients, the Laboratory of Radioecology (LARA) of the Federal Fluminense University has been performing analysis of 137 Cs, 40 K and NH 4 concentrations in several vegetal compartments of agricultural tropical plants, such as guava (Psidium guajava), mango (Mangifera indica), avocado (Persea americana), pomegranate (Punica granatum), papaya (Carica Papaya), banana (Musa paradisiaca), manioc (Manihot Esculenta), and chili pepper (Capsicum fructescens) trees. Measurements of 137 Cs, 40 K and NH 4 concentrations show that these elements can be very mobile within a plant, exhibiting the highest values of concentration in the growing parts of the trees: fruits, leaves, twigs, barks and the outer growth layers. On the other hand, our results indicate that for wood trees (such as guava, mango, avocado, pomegranate and chili pepper trees) do both caesium and the vegetal nutrients have simultaneously higher concentrations in the youngest rather than in the oldest

  18. On the numerical simulation of tracer flows in porous media

    International Nuclear Information System (INIS)

    Aquino, J.; Pereira, F.; Amaral Souto, H.P.; Francisco, A.S.

    2007-01-01

    We discuss in detail a new Lagrangian, locally conservative procedure which has been proposed for the numerical solution of linear transport problems in porous media. The new scheme is computationally efficient, virtually free of numerical diffusion, and can be applied to investigate numerically the time evolution of radionuclide contaminant plumes. Results of two-dimensional simulations of tracer flows will be presented to show the influence on the computed solutions of distinct interpolation functions for evaluating the velocity field at any position of the physical domain, as required by the Lagrangian scheme. (author)

  19. Tracer sa route, en toute intransparence numérique ?

    Directory of Open Access Journals (Sweden)

    Philippe Vidal

    2015-12-01

    Full Text Available « Comme l’intransparence des vitres ferait tache dans une habitation et l’attristerait en obstruant le passage du regard, on a dû chercher au moyen de voir au travers sans être vu, et l’on a inventé le verre mousseline. » L’expression « tracer sa route » est souvent utilisée dans un sens familier. Elle signifie, ordinairement, partir à l’aventure, sans se soucier des éventuelles contraintes et conséquences d’un tel choix, qu’elles soient sociales, matérielles ou familiales. A l’image des trav...

  20. A single hole tracer test to determine longitudinal dispersion

    International Nuclear Information System (INIS)

    Noy, D.J.; Holmes, D.C.

    1986-03-01

    The paper concerns a single hole tracer test to determine longitudinal dispersion, which is an important parameter in assessing the suitability of a site for radioactive waste disposal. The theory, equipment and procedure for measuring longitudinal dispersion in a single borehole is described. Results are presented for field trials conducted in an aquifer, where the technique produced good results. The measured value of longitudinal dispersion, from a single hole test, relates only to a limited volume of rock immediately adjacent to the borehole. (U.K.)

  1. Preparation of radioactive tracer for studying sediment movement

    International Nuclear Information System (INIS)

    Hussain, S.D.; Ghauri, G.A.; Qureshi, M.H.; Khan, N.A.

    1983-06-01

    In order to study the movement of sediment in harbours, estuaries and streams, artificial sediment in the form of glass is prepared. A preselected nuclide is added to the glass during its manufacture. The density and size distribution of the glass particles is method with that of the natural sediment. The activation of the artificial sediment in a reactor changes the nuclide into a radioactive isotope thereby tagging it and making it possible to trace its movement with suitable radiation detector. The method of tracer preparation is described with special reference to sadiment movement studies at Karachi harbour. (authors)

  2. Use of medical imaging as an epidemiologic tracer

    International Nuclear Information System (INIS)

    Dartigues, J.F.

    1987-01-01

    Medical imaging is a source of data for clinical and epidemiological research just like any other factual information obtained during medical treatment. Medical imaging data, like any other information, are not really useful unless they are obtained in rigorously controlled and determined conditions, defined a priori in the research protocol. In order to be use as an epidemiologic tracer (that is, as a meaning of finding a given pathology in a given population and during a given time period), the imaging data have to be valid, reliable, and representative, of easy access and obtained at a low cost [fr

  3. Application of tracers in the fight against hydrological pollution

    International Nuclear Information System (INIS)

    Guizerix, J.; Margrita, R.

    1978-01-01

    A statement is made on the laboratory know-how in the field of the applications of tracers in the fight against hydrological pollution. In surface hydrology it concerns the determination of the self-purifying powers of watercourses and the treatment of a certain number of problems relating to the transfer of polluting substances to the hydrographical system. In hydrogeology, the various studies made and being made deal with the transfer of water, a vector of pollution, with the interaction of polluting agents with the porous environment, and thus with the general problem of the protection of underground water catchments [fr

  4. Radioactive tracer system to indicate drill bit wear or failure

    International Nuclear Information System (INIS)

    Fries, B.A.

    1975-01-01

    A radioactive tracer system for indicating drill bit wear or failure utilizing radioactive krypton 85 in clathrate form, in the form of water-soluble kryptonates, or dissolved grease, is described. Preferably the radioactive krypton is placed so that when drill bit wear or failure occurs, the radioactive krypton 85 is relased and effectively becomes diffused in the circulating drilling fluid. At the surface, the radioactive krypton 85 gas is separated from the circulating drilling fluid by gas-mud separating means and is transported as a gas to a counting chamber where an accurate radioactivity count of beta rays released from the krypton is obtained. (Patent Office Record)

  5. Dispersion of tracers by the oceanic eddy field modelling programme

    International Nuclear Information System (INIS)

    Richards, K.J.

    1986-01-01

    A numerical model has been developed to study the dispersion of tracers by the oceanic eddy field. The study is designed to investigate the horizontal and vertical structure of the eddies and how this structure is influenced by the bottom topography. It is found that hills and valleys have a strong effect on the eddies above them. The flow close to the bottom has a tendency to be steered by the height contours. The surface and bottom flows become decorrelated and the vertical variation of the kinetic energy of the eddies is increased with higher topographic features. (author)

  6. Dual-gas tracers for subsurface characterization and NAPL detection

    International Nuclear Information System (INIS)

    Gauglitz, P.A.; Peurrung, L.M.; Mendoza, D.P.; Pillay, G.

    1994-11-01

    Effective design of in situ remediation technologies often requires an understanding of the mass transfer limitations that control the removal of contaminants from the soil. In addition, the presence of nonaqueous phase liquids (NAPLs) in soils will affect the ultimate success or failure of remediation processes. Knowing the location of NAPLs within the subsurface is critical to designing the most effective remediation approach. This work focuses on demonstrating that gas tracers can detect the location of the NAPLs in the subsurface and elucidating the mass transfer limitations associated with the removal of contaminants from soils

  7. Preparation of uranium-230 as a new uranium tracer

    International Nuclear Information System (INIS)

    Hashimoto, T.; Kido, K.; Sotobayashi, T.

    1977-01-01

    A uranium isotope, 230 U(T=20.8 d), was produced from the 231 Pa(γ,n) 230 Pa→viaβ - decay 230 U process with a bremsstrahlung irradiation on a protactinium target. After standing for about one month to obtain a maximal growth of 230 U, the uranium was chemically purified, applying an ion-exchange method. The purity of the 230 U obtained was examined with alpha spectrometry and an intrinsic alpha peak due to 230 U as a new uranium tracer in an alpha spectrometric analysis of uranium isotopes is described. (author)

  8. Study of transport in unsaturated sands using radioactive tracers

    International Nuclear Information System (INIS)

    Merritt, W.F.; Pickens, J.F.; Allison, G.B.

    1979-01-01

    A laboratory experiment was conducted to investigate the mixing that occurs as a series of labelled pulses of water are transported by gravity drainage down through a sand filled column having a water table imposed at the bottom. It also demonstrated the utility of gamma-ray emitting radioactive tracers in studying transport in unsaturated or saturated porous media. The motivation for pursuing this topic was developed from observing that the content of oxygen-18, deuterium and tritium in rainwater shows marked temporal variations whereas their concentrations below the water table in shallow ground water flow systems are generally found to show much less variation. (auth)

  9. Determination of viscosity in recirculating fluidized bed using radioactive tracer

    International Nuclear Information System (INIS)

    Silva, G.G. da.

    1986-01-01

    The use of radioactive tracer for measuring viscosity is proposed. The methodology relates the terminal velocity of a radioactive sphere in interior of fluid with the viscosity, which can be a fluidized bed or total flow of solids. The arrangement is composed by two γ detectors placed externally and along the bed. Both detectors are coupled by amplifier to electronic clock. The drop time of sphere between two detectors is measured. The bed viscosity two detectors is measured. The bed viscosity is calculated from mathematical correlations of terminal velocity of the sphere. (M.C.K.)

  10. Water Vapor Tracers as Diagnostics of the Regional Hydrologic Cycle

    Science.gov (United States)

    Bosilovich, Michael G.; Schubert, Siegfried D.; Einaudi, Franco (Technical Monitor)

    2001-01-01

    Numerous studies suggest that local feedback of surface evaporation on precipitation, or recycling, is a significant source of water for precipitation. Quantitative results on the exact amount of recycling have been difficult to obtain in view of the inherent limitations of diagnostic recycling calculations. The current study describes a calculation of the amount of local and remote geographic sources of surface evaporation for precipitation, based on the implementation of three-dimensional constituent tracers of regional water vapor sources (termed water vapor tracers, WVT) in a general circulation model. The major limitation on the accuracy of the recycling estimates is the veracity of the numerically simulated hydrological cycle, though we note that this approach can also be implemented within the context of a data assimilation system. In the WVT approach, each tracer is associated with an evaporative source region for a prognostic three-dimensional variable that represents a partial amount of the total atmospheric water vapor. The physical processes that act on a WVT are determined in proportion to those that act on the model's prognostic water vapor. In this way, the local and remote sources of water for precipitation can be predicted within the model simulation, and can be validated against the model's prognostic water vapor. As a demonstration of the method, the regional hydrologic cycles for North America and India are evaluated for six summers (June, July and August) of model simulation. More than 50% of the precipitation in the Midwestern United States came from continental regional sources, and the local source was the largest of the regional tracers (14%). The Gulf of Mexico and Atlantic regions contributed 18% of the water for Midwestern precipitation, but further analysis suggests that the greater region of the Tropical Atlantic Ocean may also contribute significantly. In most North American continental regions, the local source of precipitation is

  11. Tritium and deuterium as water tracers in hydrologic systems. Completion report

    International Nuclear Information System (INIS)

    Stewart, G.L.; Stetson, J.R.

    1975-05-01

    A study was conducted to evaluate the suitability of deuterium and tritium as tracers to depict water and pollutant movement in porous media. This involved studying the interaction of these tracers with soil materials and evaluating this interaction in terms of retardation in tracer flow velocity, compared to bulk water flow. Previous work had suggested that tritium and deuterium interact with soils and are removed from tracer solution during flow. The data presented clearly show that a tracing front becomes diluted in tracer during infiltration into oven-dried soil. There appears to be very little difference between the degree of tritium and deuterium interaction. The source of interaction is demonstrated to be primarily hydroxyl associated with the clay minerals. These exchange sites are destroyed by heating soil to 70C which eliminates tracer loss during infiltration

  12. Use of (3H) and (125I) tracers in steroid radioimmunoassays

    International Nuclear Information System (INIS)

    Jeffcoate, S.L.

    1975-01-01

    The comparative use of 3 H and 125 I tracers in steroid radioimmunoassays will be discussed around the following points: - 3 H. Advantages: they can be purchased commercially and have a long shelf-life. Disadvantages: they may have reduced affinity for antibodies due to ''isotope effects''; the counting of β-emitters is more expensive and difficult; 3 H tracers are not available for all steroids. - 125 I. Advantages: gamma-counting is cheaper, simpler and more precise; 125 I tracers may have higher affinity for antibodies than unlabelled steroids; 125 I can be used to label any steroid. Disadvantages: 125 I tracers have a limited shelf-life (n.b. six months for 125 I histamine tracers). The high affinity of some tracers will be a big disadvantage if the unlabelled steroid cannot compete effectively

  13. An experimental study of tracers for labelling of injection gas in oil reservoirs

    International Nuclear Information System (INIS)

    Dugstad, Oe.

    1992-01-01

    This work demonstrates the feasibility of the PMCP and PMCH as tracers in field experiments. These compounds have properties which make them as well suited for well to well studies as the more common tracers CH 3 T and 85 Kr. In an injection project carried out at the Gullfaks field in the North Sea the two PFCs verified communication between wells. This implies communication between different geological layers in the reservoir and also communication across faults within the same layers. Laboratory studies carried out have focused on the retention of the tracers in dynamic flooding experiments under conditions comparable with those in the petroleum reservoirs. Simultaneous injection of a variety of tracers has shown individual variations in tracer retention which are caused by important reservoir parameters as fluid saturation and rock properties. By proper design of field injection programs the tracers response may therefore be used to estimate fluid saturation if actual rock properties are known. 45 refs., 20 figs., 13 tabs

  14. Development and Validation of Water Vapor Tracers as Diagnostics for the Atmospheric Hydrologic Cycle

    Science.gov (United States)

    Bosilovich, Michael G.; Schubert, Siegfried D.; Einaudi, Franco (Technical Monitor)

    2000-01-01

    Understanding of the local and remote sources of water vapor can be a valuable diagnostic in understanding the regional atmospheric hydrologic cycle. In the present study, we have implemented passive tracers as prognostic variables to follow water vapor evaporated in predetermined regions until the water tracer precipitates. The formulation of the sources and sinks of tracer water is generally proportional to the prognostic water vapor variable. Because all water has been accounted for in tracers, the water vapor variable provides the validation of the tracer water and the formulation of the sources and sinks. The tracers have been implemented in a GEOS General Circulation Model (GCM) simulation consisting of several summer periods to determine the source regions of precipitation for the United States and India. The recycling of water and interannual variability of the sources of water will be examined. Potential uses in GCM sensitivity studies, predictability studies and data assimilation will be discussed.

  15. 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.

  16. COMPARISON OF THREE TRACER TESTS AT THE RAFT RIVER GEOTHERMAL SITE

    Energy Technology Data Exchange (ETDEWEB)

    Earl D Mattson; Mitchell Plummer; Carl Palmer; Larry Hull; Samantha Miller; Randy Nye

    2011-02-01

    Three conservative tracer tests have been conducted through the Bridge Fault fracture zone at the Raft River Geothermal (RRG) site. All three tests were conducted between injection well RRG-5 and production wells RRG-1 (790 m distance) and RRG-4 (740 m distance). The injection well is used during the summer months to provide pressure support to the production wells. The first test was conducted in 2008 using 136 kg of fluorescein tracer. Two additional tracers were injected in 2010. The first 2010 tracer injected was 100 kg fluorescein disodium hydrate salt on June, 21. The second tracer (100 kg 2,6-naphthalene disulfonic acid sodium salt) was injected one month later on July 21. Sampling of the two productions wells is still being performed to obtain the tail end of the second 2010 tracer test. Tracer concentrations were measured using HPLC with a fluorescence detector. Results for the 2008 test, suggest 80% tracer recover at the two production wells. Of the tracer recovered, 85% of tracer mass was recovered in well RRG-4 indicating a greater flow pathway connection between injection well and RRG-4 than RRG-1. Fluorescein tracer results appear to be similar between the 2008 and 2010 tests for well RRG-4 with peak concentrations arriving approximately 20 days after injection despite the differences between the injection rates for the two tests (~950 gpm to 475 gpm) between the 2008 and 2010. The two 2010 tracer tests will be compared to determine if the results support the hypothesis that rock contraction along the flow pathway due to the 55 oC cooler water injection alters the flow through the ~140 oC reservoir.

  17. Tracer techniques in karst hydrogeology. Application to the location of karst aquifers

    International Nuclear Information System (INIS)

    Mangin, A.; Molinari, J.

    1976-01-01

    From the recent progress in karst aquifer simulation techniques and the improved knowledge of tracers, the old-established tracer technique has become an invaluable instrument for hydrogeological survey work. Typical information obtainable includes karst system boundaries features and location of hydrodynamic discontinuities, flow variation in both space and time. Tracer methods are a basic requirement for investigation of karst groundwater supplies and determining protection zones for water supply points [fr

  18. The use of tracer techniques to measure water flow rates in steam turbines

    International Nuclear Information System (INIS)

    Whitfield, O.J.; Blaylock, G.; Gale, R.W.

    1979-01-01

    Radioactive and chemical tracers offer some unique advantages in detailed flow measurement on steam turbine plant. A series of experiments on a nuclear power station are reported where tracers successfully measured water flow rates and the initial steam moisture with an accuracy suitable for performance and commissioning tests. Both radioactive and chemical tracer methods produced identical results. Straightforward practical procedures were evolved that ensured repeatable accuracy and in addition a quantitative method of detecting heater leaks on load was established. (author)

  19. 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)

  20. Progress report on R + D activities of the Institute fuer Reaktorenentwicklung in 1980

    International Nuclear Information System (INIS)

    1981-02-01

    The Institute fuer Reaktorentwicklung is mostly concerned with technical problems in the development and safety assurance of nuclear facilities. The tasks, some of which are carried out in cooperation with other internal and external institutions, are of a theoretical and experimental nature, most of them in the field of reactor safety. The two main fields are the Projekt Schneller Brueter (PSB) and Projekt Nukleare Sicherheit (PNS). The contributions for PSB, i.e. layout and safety of sodium-cooled fast breeder reactors, refer to investigations of the thermohydraulic and neutron-kinetical response of the core to accidents of very low probability as well as investigations of the effects of local core coling disturbances, with special consideration to possible damage propagation mechanisms and the possibility of detecting these processes. In the field of LWR safety, dynamic loads on core internals have been investigated during the HDR blowdown experiments as well as dynamic loads on containment structures and fuel rod behaviour during LOCA. (orig.) [de

  1. 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.)

  2. Brake force estimation for electromechanical vehicle brakes; Bremskraft-Rekonstruktion fuer elektromechanische Fahrzeugbremsen

    Energy Technology Data Exchange (ETDEWEB)

    Schwarz, R. [Continental Teves (Germany)

    1999-06-01

    Due to the increasing safety and comfort demands of the customer, the functionality of modern brake systems has grown continuously in the last years. However, implementation of the extended functionality in conventional brake hydraulics makes active electronic intervention necessary and therefore requires a lot of technical effort. In recent years the automotive supplier industry has started to develop brake systems which have electromechanical brake actuators generating the brake forces at the individual wheels. Electromechanically actuated wheel brakes need to be operated in a closed control loop. This paper introduces a new method to reconstruct the needed feedback value brake force from easy to measure signals. (orig.) [Deutsch] Aufgrund des gestiegenen Sicherheits- und Komfortbewusstseins der Fahrzeugkaeufer ist die Funktionsvielfalt moderner Bremssysteme in den letzten Jahren staendig gewachsen. Die Umsetzung der erweiterten Funktionalitaet mittels konventioneller Bremsenhydraulik ist jedoch durch den elektronischen, aktiven Eingriff sehr aufwendig. In den letzten Jahren hat daher die Automobilzulieferindustrie begonnen, Bremssysteme zu entwickeln, bei denen die Bremskraft an den einzelnen Raedern von elektromechanischen Bremsaktuatoren aufgebracht wird. Elektromechanisch betaetigte Radbremsen muessen im geschlossenen Regelkreis betrieben werden. Der vorliegende Beitrag, der im Rahmen einer Forschungskooperation zwischen Continental Teves und dem Institut fuer Automatisierungstechnik der TU Darmstadt entstand stellt ein Verfahren vor, mit dem die dafuer benoetigte Rueckfuehrungsgroesse `Bremskraft` aus einfach messbaren Signalen rekonstruiert werden kann. (orig.)

  3. Actively controlled current collector; Aktiv geregelter Stromabnehmer. Innovation fuer den schnellen Verkehr auf konventionellen Strecken

    Energy Technology Data Exchange (ETDEWEB)

    Mueller, C.

    2003-07-01

    Deutsche Bahn is presently endeavouring to further improve the interaction between the overhead wire and the current collectors on its locomotives and trainsets. The major factors behind this initiative are cost, quality and noise prevention. The outcome is the development of a completely new type of current collector for high-speed operation even on conventional track. Prototypes have meanwhile undergone practical trials on the 200 km/h line from Augsburg to Donauwoerth. The new current collector is a single-arm pantograph jointly developed by DB and Bombardier Transportation. (orig.) [German] Die Deutsche Bahn versucht derzeit, das Zusammenspiel von Oberleitung und den Stromabnehmern ihrer Lokomotiven und Triebzuege weiter zu verbessern. Kosten, Qualitaet und Laermschutz sind dabei die wesentlichen Gruende. Sie haben zur Entwicklung eines voellig neuen Stromabnehmer-Typus speziell fuer den Hochgeschwindigkeitsverkehr auch auf konventionellen Strecken gefuehrt. Auf der Tempo-200-Strecke von Augsburg nach Donauwoerth absolvierten jetzt Prototypen erste Praxis-Tests. Es handelt sich um aktiv geregelte, akustisch optimierte Einholmstromabnehmer, gemeinsam entwickelt von DB und Bombardier Transportation. (orig.)

  4. Progress report on research and development activities of the Institut fuer Neutronenphysik und Reaktortechnik in 1980

    International Nuclear Information System (INIS)

    1981-02-01

    The Institut fuer Neutronenphysik und Reaktortechnik carries out research in nuclear enginering especially in the context of the development of sodium-cooled fast breeder reactors. The institute does theoretical and experimental work in equal shares. Most of the work is done in cooperation with other institutes and industrial groups. In the framework of the Projekt Schneller Brueter , the institute investigates the layout and safety problems, from a reactor physics point of view of large fast breeder cores. Problems concerning the effects of LWR accidents on population and environment are investigated in the Projekt Nukleare Sicherheit . To the Projekt Wiederaufarbeitung , the institute is contributing work on fuel cycle physics and the development of a suitable instrumentation. In the field of nuclear safeguards, the implementation of monitoring systems is being investigated. Research outside projects is being done on technical and physical problems of fusion by inertial confinement and application of nuclear power on the transportation sector with hydrogen as an energy source. The main results obtained in 1980 in the various projects are presented. (orig./RW) [de

  5. 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.

  6. Possibilities of free cooling in prefabricated residential buildings; Moeglichkeiten der freien Kuehlung fuer Wohngebaeude in Fertigbauweise

    Energy Technology Data Exchange (ETDEWEB)

    Truemper, H.; Hain, K.; Wirth, S. [Dortmund Univ. (Germany). Lehrstuhl Technische Gebaeudeausruestung

    1999-07-01

    Due to their efficient heat insulation, modern low-energy houses can develop disagreeably high room temperatures in the summer. Use of room cooling devices for cooling residential buildings in central Europe is not feasible for ecological as well as economic reasons. This paper presents the buried heat exchanger and the cellar wall exchanger as alternatives to the cooling of incoming air in ventilated low-energy residential buildings. Both are in principle cold storages with coiled pipes taking in air from outside. The buried heat exchanger is charged with cold during the heating period (seasonal storage), whereas the cellar wall exchanger accumulates and gives off cold daily. (orig.) [German] In modernen Niedrigenergiehaeusern koennen sich aufgrund einer verbesserten Waermedaemmung waehrend des Sommers Raumtemperaturen einstellen, die nicht als behaglich empfunden werden. Raumkuehlgeraete scheiden aus oekologischen und oekonomischen Gruenden fuer eine Kuehlung von Wohngebaeuden in Mitteleuropa aus. Als Alternativen zur Kuehlung der Zuluft bei Niedrigenergiehaeusern mit Wohnungslueftung werden der Erdwaermeaustauscher und der Kellerwandaustauscher vorgestellt. Hierbei handelt es sich um Kaeltespeicher, in welchen Rohrschlangen verlegt sind, ueber welche die Aussenluft angesaugt wird. Der Erdwaermeaustauscher wird als Kaeltespeicher waehrend der Heizperiode aufgeladen (saisonaler Speicher), wohingegen der Kellerwandaustauscher taeglich be- und entladen wird. (orig.)

  7. 1981 research programme and budget of Hahn-Meitner-Institut fuer Kernforschung Berlin

    International Nuclear Information System (INIS)

    Anon.

    1981-01-01

    Hahn-Meitner-Institut fuer Kernforschung Berlin (HMI) is one of the twelve large research centers of the Federal Republic of Germany; like the other centers, it has to present a combined research programme and budget (programme budget) every year. In these programme budgets, as in the medium-term financial planning in the federal budget, planning for the current year is combined with a medium-term plan for the three next years. For the year 1981, the budget of HMI includes a total expenditure of about DM 85 million, DM 71.2 million of which are direct R + D expenditures. This R + D programme is carried by 396 of the total staff of 705. Research is done in the following fields (approximate figures): Heavy ion physics DM 23.0 million. Radiation- and photochemistry DM 11.4 million. Solid state research DM 20.9 million. Nuclear chemistry DM 8.9 million. Data processing/electronics DM 7.0 million. (orig./UA) [de

  8. 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.)

  9. 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

  10. 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.

  11. Wirelessly powered micro-tracer enabled by miniaturized antenna and microfluidic channel

    International Nuclear Information System (INIS)

    Duan, G; Zhao, X; Seren, H R; Chen, C; Zhang, X

    2015-01-01

    A miniaturized antenna, 380μm by 380μm in size, was fabricated and integrated with a commercialized passive RFID chip to form a micro-tracer, whose size was 2mm by 1mm in total. The micro-tracer was wirelessly powered and interrogated by a single layer spiral reader antenna through near field coupling. To maximize the working distance, the resonant frequency of micro-tracer and reader antenna were matched at 840MHz. Due to the ultra small size of the tracer antenna, power transfer efficiency decreased dramatically as the distance between tracer antenna and reader antenna increased, thus the working distance of the microtracer was limited within 1mm. To achieve massive operation of the micro-tracer, a microfluidic platform was fabricated with in channel focusing and separation. Acrylic sheets were laser cut to define the channel and cover structure, then bonded together layer by layer with a glass substrate, on which reader antenna was integrated. Pump oil was used as the fluidic media carrying the micro-tracer flowing inside the microfluidic channel. The wireless power transfer and real-time communication was demonstrated with the micro-tracer flowing above the reader antenna, as the ID of the micro-tracer was retrieved and displayed on a computer screen. (paper)

  12. On-line measurements of liquid carry-over from scrubbers using radioactive tracers

    Energy Technology Data Exchange (ETDEWEB)

    Haugan, A; Hassfjell, S [Institute for Energy Technology, Kjeller (Norway); Finborud, A [Mator, Porsgrunn (Norway)

    2004-07-01

    A method to measure liquid carry-over from scrubbers using gamma-emitting tracers is described and results from field tests at two onshore installations are presented. One water/1,2-ethanediol (MEG) and two hydrocarbon liquid (condensate) tracers have been used in the tests. One of the condensate tracers deposited to some extent inside the process pipe, while the other had a too high vapor pressure. The water/MEG tracer showed no MEG carry-over while the carry-over of MEG was documented to be considerable. (author)

  13. On-line measurements of liquid carry-over from scrubbers using radioactive tracers

    International Nuclear Information System (INIS)

    Haugan, A.; Hassfjell, S.; Finborud, A.

    2004-01-01

    A method to measure liquid carry-over from scrubbers using gamma-emitting tracers is described and results from field tests at two onshore installations are presented. One water/1,2-ethanediol (MEG) and two hydrocarbon liquid (condensate) tracers have been used in the tests. One of the condensate tracers deposited to some extent inside the process pipe, while the other had a too high vapor pressure. The water/MEG tracer showed no MEG carry-over while the carry-over of MEG was documented to be considerable. (author)

  14. Plan for radionuclide tracer studies of the residence time distribution in the Wilsonville dissolver and preheater

    International Nuclear Information System (INIS)

    Jolley, R.L.; Begovich, J.M.; Brashear, H.R.

    1983-12-01

    Stimulus-response measurements using radiotracers to measure residence time distribution (RTD) and hydrodynamic parameters for the preheaters and dissolvers at the Ft. Lewis Solvent Refined Coal (SRC) and the Exxon Donor Solvent (EDS) coal conversion pilot plants are reviewed. A plan is also presented for a series of radioactive tracer studies proposed for the Advanced Coal Liquefaction Facility at Wilsonville, Alabama, to measure the RTD for the preheater and dissolvers in the SRC-I mode. The tracer for the gas phase will be 133 Xe, and 198 Au (on carbonized resin or as an aqueous colloidal suspension) will be used as the slurry tracer. Four experimental phases are recommended for the RTD tracer studies: (1) preheater; (2) dissolver with 100% takeoff; (3) dissolver with 100% takeoff and solids withdrawal; and (4) dissolver with 50% takeoff. Eighteen gas-tracer and 22 liquid-tracer injections are projected to accomplish the four experimental phases. Two to four tracer injections are projected for preliminary tests to ensure the capability of safe injection of the radiotracers and the collection of statistically significant data. A complete projected cost and time schedule is provided, including procurement of necessary components, preparation of the radiotracers, assembly and testing of tracer injection apparatus and detection systems, onsite work and tracer injections, laboratory experimentation, data analysis, and report writing

  15. Tracer technique for measuring specific activity of 63 Ni, using 4πβ-γ

    International Nuclear Information System (INIS)

    Iwahara, A.

    1979-01-01

    The specific activity of a 6 3 Ni solution has been measured by an efficiency tracer technique using a 4 π β - γ coincidence system. 6 3 Ni was chosen. Because it's a very low energy pure beta emitter. Due to chemical compatibility and beta spectral shapes, 6 0 Co has been chosen as tracer. In the determination of 6 3 Ni, the specific activity. As the efficiency tracer techniques requires a previous knowledge of tracer activity, this has been measured by a conventional 4 π β -γ coincidence method. (author)

  16. USE OF PERFLUOROCARBON TRACER (PFT) TECHNOLOGY FOR SUBSURFACE BARRIER INTEGRITY VERIFICATION AT THE WALDO TEST SITE

    Energy Technology Data Exchange (ETDEWEB)

    SULLIVAN,T.; HEISER,J.; SENUM,G.; MILLIAN,L.

    2000-02-27

    Researchers from Brookhaven National Laboratory (BNL) tested perfluorocarbon (PFT) gas tracers on a subsurface barrier with known flaws at the Waldo test facility [operated by Science and Engineering Associates, Inc (SEA)]. The tests involved the use of five unique PFT tracers with a different tracer injected along the interior of each wall of the barrier. A fifth tracer was injected exterior to the barrier to examine the validity of diffusion controlled transport of the PFTs. The PFTs were injected for three days at a nominal flow rate of 15 cm{sup 3}/min and a concentrations in the range of a few hundred ppm. Approximately 65 liters of air laced with tracer was injected for each tracer. The tracers were able to accurately detect the presence of the engineered flaws. Two flaws were detected on the north and east walls and lane flaw was detected on the south and west walls. In addition, one non-engineered flaw at the seam between the north and east walls was also detected. The use of multiple tracers provided independent confirmation of the flaws and permitted a distinction between tracers arriving at a monitoring port after being released from a nearby flaw and non-engineered flaws. The PFTs detected the smallest flaw, 0.5 inches in diameter. Visual inspection of the data showed excellent agreement with the known flaw locations and the relative size of the flaws was accurately estimated.

  17. The use of synthetic colloids in tracer transport experiments in saturated rock fractures

    International Nuclear Information System (INIS)

    Reimus, P.W.

    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

  18. Water tracers in the general circulation model ECHAM

    International Nuclear Information System (INIS)

    Hoffmann, G.; Heimann, M.

    1993-01-01

    We have installed a water tracer model into the ECHAM General Circulation Model (GCM) parameterizing all fractionation processes of the stable water isotopes ( 1 H 2 18 O and 1 H 2 H 16 O). A five year simulation was performed under present day conditions. We focus on the applicability of such a water tracer model to obtain information about the quality of the hydrological cycle of the GCM. The analysis of the simulated 1 H 2 18 O composition of the precipitation indicates too weak fractionated precipitation over the Antarctic and Greenland ice sheets and too strong fractionated precipitation over large areas of the tropical and subtropical land masses. We can show that these deficiencies are connected with problems of model quantities such as the precipitation and the resolution of the orography. The linear relationship between temperature and the δ 18 O value, i.e. the Dansgaard slope, is reproduced quite well in the model. The slope is slightly too flat and the strong correlation between temperature and δ 18 O vanishes at very low temperatures compared to the observations. (orig.)

  19. Acupuncture meridians demythified. A study using the radioactive tracer method

    International Nuclear Information System (INIS)

    Simon, J.; Esquerre, J.P.; Guiraud, R.; Guiraud, G.; Lazorthes, Y.

    1988-01-01

    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 [fr

  20. 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.

  1. Dispersion of dissolved tracers released at the seafloor

    International Nuclear Information System (INIS)

    Kupferman, S.L.; Moore, D.E.

    1983-01-01

    The authors present scenarios that describe the temporal and spatial development of a concentration field of a dissolved tracer released at the seafloor for one Pacific and two Atlantic study areas. The scenarios are closely tied to available data by means of simple analytical models, and they proceed in stages from short time and space scales in the immediate vicinity of a release point to those scales characteristic of entire ocean basins. They introduce and discuss the concepts of internal mixing time and residence time in the benthic mixed layer, which are useful for developing an intuitive feeling for the behavior of a tracer. They also introduce the concept of domain of occupation, which is useful in drawing distinctions between mixing and stirring in the ocean. From this study it is apparent that reliable estimation of mixing will require careful consideration of the dynamics of the eddy fields in the ocean. In addition they urgently need more information that relates isopycnal structure and bottom topography to local near-bottom circulation

  2. Soil homogeneity evaluation by radionuclide tracer breakthrough curve interpretation

    International Nuclear Information System (INIS)

    Brenizer, J.S. Jr.; Jarrett, A.R.; Jester, W.A.

    1980-01-01

    Increasing concern about the environmental impact of hazardous waste disposal has made site evaluation and site selection difficult and expensive. Pollutants, assumed to be absorbed by the soil immediately surrounding the burial trench, have been detected far from sites. Discrepancies between predicted migration distances based on indirect methods such as laboratory and computer modeling and those observed at the field site are often significant. The homogeneity of subsurface media, often assumed in laboratory and modeling studies, is seldom found in the field. The use of tracers to determine the flow characteristics of a potential disposal site involves time and expense, but offers a direct evaluation of solute transport and eliminates the assumptions inherent in indirect methods. Current modeling of solute transport in nonhomogeneous porous media is limited by the quantification of input parameters. Several general models can predict solute transport in saturated-unsaturated media from low-level disposal sites if the hydraulic characteristics and chemical reactions expected in each unique water-solute-media system can be defined. The objective of this research was to develop a method of evaluating potential shallow-land burial waste disposal sites by interpreting tracer breakthrough curve structure with respect to the hydrologic properties of the media at the potential disposal site. This methodology will be helpful in evaluating the potential performance of many types of shallow-land waste burial sites such as low-level radioactive waste disposal, surface disposal of flyash, chemical waste disposal, waste sedimentation ponds, and sanitary landfills

  3. 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.

  4. Atlantic Coast Unique Regional Atmospheric Tracer Experiment (ACURATE)

    International Nuclear Information System (INIS)

    Schubert, J.F.; Heffter, J.L.; Mead, G.A.

    1983-05-01

    The Atlantic Coast Unique Regional Atmospheric Tracer Experiment (ACURATE) is a program designed to obtain data necessary to evaluate atmospheric transport and diffusion models used to calculate regional population doses caused by nuclear facility emissions to the atmosphere. This experiment will significantly improve the basis for evaluating the cost effectiveness of different methods of managing airborne nuclear wastes. During the period from March 1982 through September 1982, twice daily air samples have been collected at each of five sampling stations located on a radial from the SRP to Murray Hill, NJ (1000 km). Kr-85 emitted from the F and H area chemical separations facilities is being used as a tracer to determine the transport and diffusion of atmospheric releases from the SRP. The Kr-85 concentrations in the air samples will be compared with the calculated concentrations as predicted by the transport and diffusion models. The Kr-85 data and the meteorological data are being archived and will be made available to the modeling community

  5. Tracer dispersion in two-dimensional rough fractures.

    Science.gov (United States)

    Drazer, G; Koplik, J

    2001-05-01

    Tracer diffusion and hydrodynamic dispersion in two-dimensional fractures with self-affine roughness are studied by analytic and numerical methods. Numerical simulations were performed via the lattice-Boltzmann approach, using a boundary condition for tracer particles that improves the accuracy of the method. The reduction in the diffusive transport, due to the fractal geometry of the fracture surfaces, is analyzed for different fracture apertures. In the limit of small aperture fluctuations we derive the correction to the diffusive coefficient in terms of the tortuosity, which accounts for the irregular geometry of the fractures. Dispersion is studied when the two fracture surfaces are simply displaced normally to the mean fracture plane and when there is a lateral shift as well. Numerical results are analyzed using the Lambda parameter, related to convective transport within the fracture, and simple arguments based on lubrication approximation. At very low Péclet number, in the case where fracture surfaces are laterally shifted, we show using several different methods that convective transport reduces dispersion.

  6. Spectrally adapted red flare tracers with superior spectral performance

    Directory of Open Access Journals (Sweden)

    Ramy Sadek

    2017-12-01

    Full Text Available The production of bright light, with vivid color, is the primary purpose of signaling, illuminating devices, and fire control purposes. This study, reports on the development of red flame compositions with enhanced performance in terms of luminous intensity, and color quality. The light intensity and the imprint spectra of developed red flame compositions to standard NATO red tracer (R-284 NATO were measured using digital luxmeter, and UV–Vis. spectrometer. The main giving of this study is that the light intensity of standard NATO red tracer was increased by 72%, the color quality was also improved by 60% (over the red band from 650 to 780 nm. This enhanced spectral performance was achieved by means of deriving the combustion process to maximize the formation of red color emitting species in the combustion flame. Thanks to the optimum ratio of color source to color intensifier using aluminum metal fuel; this approach offered the highest intensity and color quality. Upon combustion, aluminum was found to maximize the formation SrCL (the main reactive red color emitting species and to minimize the interfering incandescent emission resulted from MgO and SrO. Quantification of active red color emitting species in the combustion flame was conducted using chemical equilibrium thermodynamic code named ICT. The improvement in red flare performance, established the rule that the color intensifier should be in the range from 10 to 15 Wt % of the total composition.

  7. 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)

  8. Tracers discrimination of sediment provenience in rural catchment through EDXRF

    International Nuclear Information System (INIS)

    Melquiades, Fabio L.; Thomaz, Edivaldo L.

    2010-01-01

    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)

  9. Artificial sweeteners as potential tracers of municipal landfill leachate

    International Nuclear Information System (INIS)

    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. -- Highlights: • Artificial sweeteners detected at 14 of 15 municipal landfill sites. • Concentrations comparable to wastewater even at sites closed for >50 yr. • Saccharin elevated at all sites; potentially diagnostic of landfill impacts. • Potential for age-dating recent (past 2 decades) waste with acesulfame. -- Artificial sweeteners may be useful for tracing landfill leachate contamination and distinguishing it from wastewater impacts

  10. Applications of stable isotope tracers to air pollution problems

    International Nuclear Information System (INIS)

    Kelly, W.R.

    1985-01-01

    One of the fundamental environmental problems facing the United States is how to effect acid rain abatement in the northeast United States and southeastern Canada in a cost effective manner. There are several key scientific questions that must be addressed in order to design an effective strategy. These questions include the following: (1) where do pollutants from a specified source area go., (2) what chemical transformations occur during transport., and (3) where and how are these pollutants deposited. One approach to address these questions is the use of enriched stable isotopes as intentional tracers of aerosol and sulfur emissions. Isotopic tracers can determine the location and pathways of pollutants in the environment and trace pollutants back to their original source. For an element with n isotopes, it is possible to intentionally tag n-2 sources. (For example, Nd, which has seven isotopes, could be used to tag 5 different aerosol sources). To trace sulfur compounds, the two minor isotopes of sulfur, 33 S and 36 S, could be used. Methods developed at NBS using high precision mass spectrometry permits the detection of the small changes in isotopic composition brought about by the intentional tagging at a source. This may make possible the identification of a source at a particular sampling site

  11. Tracing salmon to their birthplace by activable tracer technique

    International Nuclear Information System (INIS)

    Shibuya, Masao

    1978-01-01

    Activable tracer technique was applied to trace the recurrent migration of white salmons, as a typical example of employing radioactivation analysis to the study of agricultural and marinefields. Europium was adopted because it is easy to use technically with less influence on fish body and easy to detect, and its remaining time is very long. Artificially hatched young white salmons were stocked in the Saibetsu River after being raised for a month with europium-containing feed. These stocked fish were labeled by fin-cutting method. Recurrent salmons (fin cutting-labeled fish) were then collected and dissected. The fishes were divided into otoliths, scales, flesh, internal organs, gills, bones, etc., and irradiated for 5 min in JRR-2 reactor of Japan Atomic Energy Research Institute. Europium was detected from the scales and otoliths of 3 to 4 year stocked adult fishes by γ-spectrometry of Eu. This proved the availability of activable tracer method for tracing the recurrent migration of salmons. (Kobatake, H.)

  12. Optimization of Iron Oxide Tracer Synthesis for Magnetic Particle Imaging

    Directory of Open Access Journals (Sweden)

    Sabina Ziemian

    2018-03-01

    Full Text Available The optimization of iron oxide nanoparticles as tracers for magnetic particle imaging (MPI alongside the development of data acquisition equipment and image reconstruction techniques is crucial for the required improvements in image resolution and sensitivity of MPI scanners. We present a large-scale water-based synthesis of multicore superparamagnetic iron oxide nanoparticles stabilized with dextran (MC-SPIONs. We also demonstrate the preparation of single core superparamagnetic iron oxide nanoparticles in organic media, subsequently coated with a poly(ethylene glycol gallic acid polymer and phase transferred to water (SC-SPIONs. Our aim was to obtain long-term stable particles in aqueous media with high MPI performance. We found that the amplitude of the third harmonic measured by magnetic particle spectroscopy (MPS at 10 mT is 2.3- and 5.8-fold higher than Resovist for the MC-SPIONs and SC-SPIONs, respectively, revealing excellent MPI potential as compared to other reported MPI tracer particle preparations. We show that the reconstructed MPI images of phantoms using optimized multicore and specifically single-core particles are superior to that of commercially available Resovist, which we utilize as a reference standard, as predicted by MPS.

  13. Tracer concentration contours in grain lattice and grain boundary diffusion

    International Nuclear Information System (INIS)

    Kim, Y. S.; Olander, D. R.

    1997-01-01

    Grain boundary diffusion plays a significant role in fission gas release, which is one of the crucial processes dominating nuclear fuel performance. Gaseous fission products such as Xe and Kr generated during nuclear fission have to diffuse in the grain lattice and the boundary inside fuel pellets before they reach the open spaces in a fuel rod. These processes can be studied by 'tracer diffusion' techniques, by which grain boundary diffusivity can be estimated and directly used for low burn-up fission gas release analysis. However, only a few models accounting for the both processes are available and mostly handle them numerically due to mathematical complexity. Also the numerical solution has limitations in a practical use. In this paper, an approximate analytical solution in case of stationary grain boundary in a polycrystalline solid is developed for the tracer diffusion techniques. This closed-form solution is compared to available exact and numerical solutions and it turns out that it makes computation not only greatly easier but also more accurate than previous models. It can be applied to theoretical modelings for low burn-up fission gas release phenomena and experimental analyses as well, especially for PIE (post irradiation examination). (author)

  14. Using biofuel tracers to study alternative combustion regimes

    International Nuclear Information System (INIS)

    Mack, J.H.; Flowers, D.L.; Buchholz, B.A.; Dibble, R.W.

    2007-01-01

    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 CO 2 emissions are countered with higher nitrogen oxides (NO x ) 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 NO x formation. Altering the combustion regime to burn at temperatures below the NO x 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 NO x 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

  15. 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.

  16. Infrared camera - specially developed for professional building inspection - with dew point detection tracing out fungi formation; Infrarotkamera - speziell entwickelt fuer die professionelle Gebaeudeinspektion - mit Taupunktermittlungsfunktion zum schnellen Auffinden von Gefahrbereichen fuer Schimmelbildung

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2004-07-01

    Besides the positive effect of energy saving the aspect of fungi formation has also to be respected. Fungi is not only responseable for health diseases but can also damage building materials. Examples are shown and how they can be detect by an infrared monitoring camera. (GL) [German] Die Waermeschutzverordnung und das daraus hervorgegangene Energieeinspargesetz haben weitreichende Folgen fuer Architekten, Bauingenieure, Instandhalter und Sanierer: Zeitgemaesse Gebaeude werden immer dichter, Luftzirkulation und damit der Feuchtigkeitsaustausch werden weitgehend unterbunden. Neben dem positiven Effekt der Energieersparnis ergibt sich dadurch leider oft auch ein Problem durch Schimmelbildung. Dabei ist zu bedenken, dass Schimmelpilz nicht nur gesundheitsgefaehrend ist, sondern oft auch die Bausubstanz signifikant schaedigen kann. (orig.)

  17. Skeletal scintigraphy and quantitative tracer studies in metabolic bone disease

    Science.gov (United States)

    Fogelman, Ignac

    Bone scan imaging with the current bone seeking radiopharmaceuticals, the technetium-99m labelled diphosphonates, has dramatically improved our ability to evaluate skeletal pathology. In this thesis, chapter 1 presents a review of the history of bone scanning, summarises present concepts as to the mechanism of uptake of bone seeking agents and briefly illustrates the role of bone scanning in clinical practice. In chapter 2 the applications of bone scan imaging and quantitative tracer techniques derived from the bone scan in the detection of metabolic bone disease are discussed. Since skeletal uptake of Tc-99m diphosphonate depends upon skeletal metabolism one might expect that the bone scan would be of considerable value in the assessment of metabolic bone disease. However in these disorders the whole skeleton is often diffusely involved by the metabolic process and simple visual inspection of the scan image may not reveal the uniformly increased uptake of tracer. Certain patterns of bone scan abnormality have, however, been reported in patients with primary hyperparathyroidism and renal osteo-dystrophy; the present studies extend these observations and introduce the concept of "metabolic features" which are often recognisable in conditions with generalised increased bone turnover. As an aid to systematic recognition of these features on a given bone scan image a semi-quantitative scoring system, the metabolic index, was introduced. The metabolic index allowed differentiation between various groups of patients with metabolic disorders and a control population. In addition, in a bone scan study of patients with acromegaly, it was found that the metabolic index correlated well with disease activity as measured by serum growth hormone levels. The metabolic index was, however, found to be a relatively insensitive means of identifying disease in individual patients. Patients with increased bone turnover will have an absolute increase in skeletal uptake of tracer. As a

  18. 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.)

  19. 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.)

  20. Skywards - climate design for the Moscow Federation Tower; Dem Himmel entgegen - Klimadesign fuer den Federation Tower Moskau

    Energy Technology Data Exchange (ETDEWEB)

    Reiser, Claudius [Ebert-Ingenieure GmbH and Co. KG, Competence Center Nachhaltiges Bauen, Nuernberg (Germany)

    2008-06-15

    Advanced simulation tools were used in developing the climate design for the roof covering the taller of the two blocks at Moscow's Federation Tower. The all-glass roof space at a height of 365 m is designed to accommodate the finest and most exclusive hotel areas. Several restaurants, bars and lounges and a Sky Dance Club will offer entertainment and fabulous views across the whole city. Simulations were used to develop and verify a design that ensures thermal comfort taking into account architectural, climate and utilisation requirements. The structure and the building services were simulated based on a 3D model, and simulations were carried out for summer and winter scenarios. This paper describes the design process including load calculations and the development and assessment of the climate design by means of simulation. (Abstract Copyright [2008], Wiley Periodicals, Inc.) [German] In der Entwicklung des Klimakonzeptes der Turmkappe Ost des Federation Towers in Moskau wurden modernste Simulationswerkzeuge eingesetzt. Die vollstaendig glaeserne Turmkappe in 365 m Hoehe soll Raum fuer einen der schoensten und exklusivsten Bereiche des Hotels geben. Diverse Restaurants, Bars und Lounges sowie ein Sky Dance Club sollen einmal zum Verweilen und zur naechtlichen Vergnuegung einladen und dabei stets einen traumhaften Blick ueber die gesamte Stadt ermoeglichen. Mit Hilfe der Simulation wurde fuer die Turmkappe ein Klimakonzept entwickelt und ueberprueft, das die thermische Behaglichkeit unter Beruecksichtigung von Architektur, Klima und Nutzung gewaehrleistet. Dazu wurde die Architektur inklusive der Klimatechnik in einem 3D-Modell abgebildet und fuer den Sommer- und Winterfall berechnet. Der vorliegende Beitrag vollzieht den Planungsablauf von der Lastberechnung bis hin zur Erstellung und Bewertung des Klimakonzeptes in der Simulation. (Abstract Copyright [2008], Wiley Periodicals, Inc.)