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Sample records for open chamber tecnologias

  1. Technologies for the treatment of the sulfur dioxide and nitrogen oxides generated by the combustion in open chamber; Tecnologias para el tratamiento de dioxido de azufre y oxidos de nitrogeno generados por la combustion en camara abierta

    Energy Technology Data Exchange (ETDEWEB)

    Salazar Villalpando, Maria Dolores [Instituto Mexicano del Petroleo, Mexico, D. F. (Mexico)

    1992-12-31

    In general terms, there are only three ways of avoiding the sulfur dioxide and the nitrogen oxides, generated by the combustion in open chamber, from contaminating the air; the first one is utilizing low sulfur and nitrogen content fuels, the second one is by controlling the parameters that affect the combustion and the third one to treat and/or clean the gases before exhausting them to the air. In this document, some of the treatments for diminishing the pollutant emissions generated by the combustion in open chamber, are presented. [Espanol] En terminos generales, solo existen 3 maneras de evitar que el dioxido de azufre y oxidos de nitrogeno generados por la combustion en camara abierta sigan contaminando el aire, la primera es utilizar un combustible de bajo contenido de azufre y nitrogeno, la segunda es controlar los parametros que afectan la combustion, y la tercera es tratar y/o limpiar los gases antes de emitirlos a la atmosfera. En este documento se presentan algunos tratamientos para disminuir las emisiones de contaminantes generados por la combustion en camara abierta.

  2. Free-Flow Open-Chamber Electrophoresis

    Science.gov (United States)

    Sharnez, Rizwan; Sammons, David W.

    1994-01-01

    Free-flow open-chamber electrophoresis variant of free-flow electrophoresis performed in chamber with open ends and in which velocity of electro-osmotic flow adjusted equal to and opposite mean electrophoretic velocity of sample. Particles having electrophoretic mobilities greater than mean mobility of sample particles move toward cathode, those with mobilities less move toward anode. Technique applied to separation of components of mixtures of biologically important substances. Sensitivity enhanced by use of tapered chamber.

  3. Effects of open-top chambers on Valencia' orange trees. [Citrus sinensis

    Energy Technology Data Exchange (ETDEWEB)

    Olszyk, D.M. (Environmental Protection Agency, Corvallis, OR (United States)); Takemoto, B.K. (California Air Resources Board, Sacramento (United States)); Kats, G.; Dawson, P.J.; Morrison, C.L.; Preston, J.W.; Thompson, C.R. (Univ. of California, Riverside (United States))

    Open-top field chambers are the most widely used technology for evaluating the impacts of air pollutants on vegetation. This study was conducted to evaluate the long-term effects of chambers on Valencia orange trees (Citrus sinensis (L.) Osbeck). The trees were exposed to ambient ozone (O{sub 3}) for 51 months in large (4.3-m diam. by 2.9-m high) nonfiltered open-top chambers (NF) and in ambient air without chambers (AA). Results suggest that the yield increases for NF compared to AA trees could, in part, be accounted for by decreased flux of O{sub 3} into leaves (based on decreased O{sub 3} exposure and leaf conductance). However, other factors, i.e., increased tree growth, altered leaf C allocation, and lack of wind stress occurring only in chambers, likely contributed to higher NF tree yields.

  4. Effects of open-top chambers on 'Valencia' orange trees

    Energy Technology Data Exchange (ETDEWEB)

    Olszyk, D.M.; Takemoto, B.K.; Kats, G.; Dawson, P.J.; Morrison, C.L.

    1992-01-01

    Young 'Valencia' orange trees (Citrus sinensis(L) Osbeck) were grown for four years in large open-top chambers with ambient (nonfiltered) air or in outside air to determine any effects of the chambers on the air pollutant susceptibility of the trees. Long-term ozone average concentrations (12 hours, growing season) were 8% lower, and cumulative ozone dose (hourly values >0.1 microL/L) was 29% lower in ambient chambers compared to outside air. Fruit yields were much higher (>39%) for ambient chamber trees than for outside trees over three harvests, due at least partly to less fruit drop during the growing season for ambient chamber trees. Ambient chamber trees were much larger than outside trees and produced over twice as much leaf material over four years of study. Leaves on ambient chamber trees were larger and less dense than on outside trees. Leaves on ambient chamber trees were under more stress than leaves on outside trees during summer months; with lower stomatal conductances (14% average) and transpiration rates (12%), and more negative leaf water pressure potentials (28%). In contrast, leaves on ambient chamber trees had higher net photosynthetic rates (13%) and higher leaf starch concentrations prior to tree flowering (31%), than leaves on outside trees. While these results indicated large long-term impacts on tree growth which must be considered when using open-top chambers, they did not indicate any net effect of chambers on the air pollutant susceptibility of trees which would limit the usefulness of chamber tree data for air quality impact assessment purposes.

  5. An open-walled ionization chamber appropriate to tritium monitoring for glovebox.

    Science.gov (United States)

    Chen, Zhilin; Chang, Ruiming; Mu, Long; Song, Guoyang; Wang, Heyi; Wu, Guanyin; Wei, Xiye

    2010-07-01

    An open-walled ionization chamber is developed to monitor the tritium concentration in gloveboxes in tritium processing systems. Two open walls are used to replace the sealed wall in common ionization chambers, through which the tritium gas can diffuse into the chamber without the aid of pumps and pipelines. Some basic properties of the chamber are examined to evaluate its performance. Results turn out that an open-walled chamber of 1 l in volume shows a considerably flat plateau over 700 V for a range of tritium concentration. The chamber also gives a good linear response to gamma fields over 4 decades under a pressure condition of 1 atm. The pressure dependence characteristics show that the ionization current is only sensitive at low pressures. The pressure influence becomes weaker as the pressure increases mainly due to the decrease in the mean free path of beta particles produced by tritium decay. The minimum detection limit of the chamber is 3.7x10(5) Bq/m(3).

  6. Ozone and Botrytis interactions in onion-leaf dieback: open-top chamber studies

    Energy Technology Data Exchange (ETDEWEB)

    Wukasch, R.T.; Hofstra, G.

    1977-09-01

    Paired open-top chambers were used to study interactions between Botrytis spp. and ozone in field-grown onions. Charcoal filters removed 35 to 65% of the ambient ozone, resulting in six-fold reduction of onion leaf dieback and a 28% increase in onion yield compared with unfiltered chambers. Symptoms of leaf injury appeared soon after ozone levels exceeded 294 ..mu..g/m/sup 3/ (0.15 ppm) for 4 hr. Lesions caused by Botrytis were few because no dew formed in the chambers. However, when leaves were wetted with foggers, inoculation with mycelial suspensions of B. sauamosa in late August produced significantly more lesions and leaf dieback in the unfiltered chamber. Botrytis squamosa, B. cinerea, B. allii, and several genera of secondary fungi were isolated from these lesions. Botrytis squamosa was recovered from lesions only, whereas B. cinerea and B. allii were associated more generally with onion leaf tissue regardless of lesions. 25 references, 1 figure, 2 tables.

  7. Windows Into an Open-System Magma Chamber: Cognate Xenoliths From the Kameni Islands, Santorini, Greece

    Science.gov (United States)

    Martin, V. M.; Holness, M. B.; Pyle, D. M.

    2003-12-01

    The composition of the dacite forming the Kameni Islands has been remarkably uniform over the last 2200 years, attesting to significant replenishment and mixing in the shallow open-system chamber. Insights into chamber evolution can be gained from the abundant cognate xenoliths in the dacite. The xenoliths include both cumulates from the chamber floor and quenched fragments of replenishing magma. They fall into 7 groups distinguishable by differences in chemistry, texture and mechanical behaviour. Quench xenoliths with linear CSDs are thought to have formed on the injection of aphyric magma into the chamber. Since these xenoliths commonly have an andesitic composition, this suggests the expulsion of an aphyric melt from a crystal mush in a lower chamber by filter-pressing during compaction. Those with strongly bi-modal grain size distributions indicate injection of phenocryst-bearing replenishing magma. Quench xenoliths with evolved compositions are typically found as large isolated blocks randomly dispersed throughout the host lava. In contrast, the more mafic xenoliths are distributed in tight, elongate, clusters aligned in the direction of flow, and comprising up to 100 individuals. The contrasting spatial distributions of the xenoliths reflects the different rheological properties of the xenolith types, with implications for the ease of mixing and assimilation of batches of replenishing melt in the magma chamber. The rare cumulate xenoliths are small, and are characterised by coarse grain-size, low glass and vesicle content, and are predominantly found in lava from the last (1950) eruption. They are generally found enveloped by less dense and highly vesicular quench-type xenoliths, which probably provided the buoyancy forces necessary for entrainment. Mapping of the xenolith types shows that each flow forming the Kameni Islands has a distinct xenolith population, reflecting the changing state of the emptying magma chamber. Seismic activity has preceded most

  8. Atmospheric scanning electron microscope system with an open sample chamber: Configuration and applications

    Energy Technology Data Exchange (ETDEWEB)

    Nishiyama, Hidetoshi, E-mail: hinishiy@jeol.co.jp [JEOL Ltd., 3-1-2, Musashino, Akishima, Tokyo 196-8558 (Japan); Koizumi, Mitsuru, E-mail: koizumi@jeol.co.jp [JEOL Technics Ltd., 2-6-38 Musashino, Akishima, Tokyo 196-0021 (Japan); Ogawa, Koji, E-mail: kogawa@jeol.co.jp [JEOL Technics Ltd., 2-6-38 Musashino, Akishima, Tokyo 196-0021 (Japan); Kitamura, Shinich, E-mail: kitamura@jeol.co.jp [JEOL Ltd., 3-1-2, Musashino, Akishima, Tokyo 196-8558 (Japan); Konyuba, Yuji, E-mail: ykonyuub@jeol.co.jp [JEOL Ltd., 3-1-2, Musashino, Akishima, Tokyo 196-8558 (Japan); Watanabe, Yoshiyuki, E-mail: watanabeyoshiy@pref.yamagata.jp [Yamagata Research Institute of Technology, 2-2-1, Matsuei, Yamagata 990-2473 (Japan); Ohbayashi, Norihiko, E-mail: n.ohbayashi@m.tohoku.ac.jp [Laboratory of Membrane Trafficking Mechanisms, Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University, Aobayama, Aoba-ku, Sendai, Miyagi 980-8578 (Japan); Fukuda, Mitsunori, E-mail: nori@m.tohoku.ac.jp [Laboratory of Membrane Trafficking Mechanisms, Department of Developmental Biology and Neurosciences, Graduate School of Life Sciences, Tohoku University, Aobayama, Aoba-ku, Sendai, Miyagi 980-8578 (Japan); Suga, Mitsuo, E-mail: msuga@jeol.co.jp [JEOL Ltd., 3-1-2, Musashino, Akishima, Tokyo 196-8558 (Japan); Sato, Chikara, E-mail: ti-sato@aist.go.jp [Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-4, Umezono, Tsukuba 305-8568 (Japan)

    2014-12-15

    An atmospheric scanning electron microscope (ASEM) with an open sample chamber and optical microscope (OM) is described and recent developments are reported. In this ClairScope system, the base of the open sample dish is sealed to the top of the inverted SEM column, allowing the liquid-immersed sample to be observed by OM from above and by SEM from below. The optical axes of the two microscopes are aligned, ensuring that the same sample areas are imaged to realize quasi-simultaneous correlative microscopy in solution. For example, the cathodoluminescence of ZnO particles was directly demonstrated. The improved system has (i) a fully motorized sample stage, (ii) a column protection system in the case of accidental window breakage, and (iii) an OM/SEM operation system controlled by a graphical user interface. The open sample chamber allows the external administration of reagents during sample observation. We monitored the influence of added NaCl on the random motion of silica particles in liquid. Further, using fluorescence as a transfection marker, the effect of small interfering RNA-mediated knockdown of endogenous Varp on Tyrp1 trafficking in melanocytes was examined. A temperature-regulated titanium ASEM dish allowed the dynamic observation of colloidal silver nanoparticles as they were heated to 240 °C and sintered. - Highlights: • Atmospheric SEM (ASEM) allows observation of samples in liquid or gas. • Open sample chamber allows in situ monitoring of evaporation and sintering processes. • in situ monitoring of processes during reagent administration is also accomplished. • Protection system for film breakage is developed for ASEM. • Usability of ASEM has been improved significantly including GUI control.

  9. Determining air pollutant effects on the growth and productivity of Concord grapevines using open-top chambers

    Energy Technology Data Exchange (ETDEWEB)

    Musselman, R.C.; Kender, W.J.; Crowe, D.E.

    1978-01-01

    A 4-year study was conducted to compare wine growth and yield in ambient air with growth in charcoal-filtered to remove ozone. Open top chambers, with and without charcoal filters, were placed over individual vines in a mature 'Concord' (Vitis labruscana, Bailey) vineyard. Vines growing in open top chambers, regardless of charcoal filtration, grew less, had delayed maturity of shoots, and delayed leaf senescence as compared to those not growing in chambers. Though chamber effect masked treatment effect on total vine productivity, charcoal filtration reduced oxidant stipple and increased fruit soluble solids. Year-to-year variability in severity of oxidant stipple may be related to seasonal rainfall and ambient ozone levels. 13 references, 3 tables.

  10. [Effects of elevated ozone on Pinus armandii growth: a simulation study with open-top chamber].

    Science.gov (United States)

    Liu, Chang-Fu; Liu, Chen; He, Xing-Yuan; Ruan, Ya-Nan; Xu, Sheng; Chen, Zhen-Ju; Peng, Jun-Jie; Li, Teng

    2013-10-01

    By using open-top chamber (OTC) and the techniques of dendrochronology, this paper studied the growth of Pinus armandii under elevated ozone, and explored the evolution dynamics and adaptation mechanisms of typical forest ecosystems to ozone enrichment. Elevated ozone inhibited the stem growth of P. armandii significantly, with the annual growth of the stem length and diameter reduced by 35.0% and 12.9%, respectively. The annual growth of tree-ring width and the annual ring cells number decreased by 11.5% and 54.1%, respectively, but no significant change was observed in the diameter of tracheid. At regional scale, the fluctuation of ozone concentration showed significant correlation with the variation of local vegetation growth (NDVI).

  11. Ozone deposition to an oat crop ( Avena sativa L.) grown in open-top chambers and in the ambient air

    Science.gov (United States)

    Pleijel, H.; Wallin, G.; Karlsson, P. E.; Skarby, L.; Sellden, G.

    Fluxes and deposition velocities for ozone were determined for open-top chambers with and without an oat crop, and for the adjacent field, using a resistance analogue model and the aerodynamic wind-profile method, respectively. During a period when the canopy was green and the ambient wind speeds modest, the fluxes and deposition velocities were higher in the chamber with plants than in the field crop. The deposition to chamber walls and soil in the chamber only accounted for part of that difference. The deposition velocity for ozone to the crop was light-dependent both in the chamber with plants and in the ambient air. With increasing plant senescence, the deposition velocity declined and the light dependence disappeared. Fluctuations in deposition velocity superimposed on the overall declining trend followed the same temporal pattern in the chambers with and without plants. These fluctuations in deposition velocity may partly be explained by variations in surface wetness. Differences in boundary layer conductance between chamber and ambient, which under certain conditions may significantly influence the validity of the chamber as a test system, were observed.

  12. Variable temperature effects of Open Top Chambers at polar and alpine sites explained by irradiance and snow depth

    NARCIS (Netherlands)

    Bokhorst, S.; Huiskes, A.; Aerts, R.; Convey, P.; Cooper, E.J.; Dalen, L.; Erschbamer, B.; Gudmundsson, J.; Hofgaard, H.; Hollister, R.D.; Johnstone, J.; Jónsdóttir, I.S.; Lebouvier, M.; Van de Vijver, B.; Wahren, C.-H.; Dorrepaal, E.

    2013-01-01

    Environmental manipulation studies are integral to determining biological consequences of climate warming. Open Top Chambers (OTCs) have been widely used to assess summer warming effects on terrestrial biota, with their effects during other seasons normally being given less attention even though cha

  13. POTENCIAL DOS RECURSOS EDUCACIONAIS ABERTOS PARA INTEGRAÇÃO DAS TECNOLOGIAS E CONVERGÊNCIA ENTRE AS MODALIDADES NA UFSM. POTENTIAL OF OPEN EDUCATIONAL RESOURCES FOR TECHNOLOGY INTEGRATION AND CONVERGENCE BETWEEN THE MODALITIES AT UFSM

    Directory of Open Access Journals (Sweden)

    Elena Maria Mallmann

    2013-11-01

    Full Text Available O foco de análise é a implementação e o fomento de práticas escolares, para potencializar a integração das tecnologias e a convergência entre as modalidades na Universidade Federal de Santa Maria (UFSM, Brasil, por meio de Recursos Educacionais Abertos. Objetivamos sistematizar princípios conceituais e práticas que balizam a utilização de recursos educacionais abertos, com vistas a maximizar diálogo e produção curricular mediados por tecnologias. Os procedimentos metodológicos de pesquisa-ação (planejamento participativo, observação e questionários survey geraram dados para análise referente à programação e à problematização de Recursos Educacionais Abertos, em cursos de graduação e pós-graduação mediados pelo Moodle institucional. Os resultados de acoplamento da pesquisa à ação didático-metodológica inovadora na UFSM evidenciam crescimento exponencial na programação semanal de recursos e atividades de estudo no Moodle. A afirmação conclusiva destaca que a disponibilização e o suporte técnico institucional de tecnologias em rede ampliam condições para integração e convergência entre as modalidades, especialmente no âmbito dos recursos educacionais abertos como hipertextos programados em html. The analysis focus is the implementation and the fomentation of school practices in order to enhance the technology integration and the convergence between the modalities at the Federal University of Santa Maria (UFSM, Brazil, through open educational resources. We aimed to systematize conceptual principles and practices that beacon the use of open educational resources, aspiring to maximize dialogue and curricular production mediated by technologies. The action research methodological procedures (participatory planning, observation and survey questionnaires generated analysis data relative to the programming and problematization of open educational resources, in undergraduate and graduate courses mediated

  14. Responses of sensitive and tolerant bush beans (Phaseolus vulgaris L.) to ozone in open-top chambers are influenced by phenotypic differences, morphological characteristics, and the chamber environment

    Energy Technology Data Exchange (ETDEWEB)

    Elagoez, Vahram [Plant Biology Graduate Program, University of Massachusetts, Amherst, MA 01003 (United States)]. E-mail: velagoz@nsm.umass.edu; Manning, William J. [Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, MA 01003 (United States)

    2005-08-15

    Responses of bush bean (Phaseolus vulgaris L.) lines 'S156' (O{sub 3}-sensitive) and 'R123' (O{sub 3}-tolerant), and cultivars 'BBL 290' (O{sub 3}-sensitive) and 'BBL 274' (O{sub 3}-tolerant) to ambient ozone (O{sub 3}) were investigated during the 2001 and 2002 growing seasons. Seedlings were grown in pots inside open-top chambers (OTCs), with charcoal filtered (CF) and non-filtered (NF) ambient air, and in non-chambered ambient air (AA) plots. Growth parameters from individual plants were evaluated after harvests at the end of vegetative (V{sub 4}) and reproductive (R{sub 10}) growth phases. Results at V{sub 4} indicated that CF did not provide additional benefits over NF in 'S156' in 2001 and 2002. In contrast, exposure to CF significantly impaired the growth of 'R123'. At the end of R{sub 10}, 'S156' produced more pods, most of which remained immature, and contained fewer seeds or were more frequently aborted, whereas pods produced in 'R123' reached pod maturation and senescence more consistently. Despite increased seed weights inside the OTCs, as observed in 'S156', differences between the two lines were insignificant when grown outside OTCs. Results from the 'BBL 290'/'BBL 274' pair, especially at V{sub 4} phase, remained inconclusive. Plant morphological characteristics, variabilities in environmental conditions, and 'chamber effects' inside OTCs were influential in determining plant response to ambient O{sub 3}. - Phenotypic differences, morphological characteristics, and 'chamber effects' inside OTCs are equally influential in determining the responses of beans to O{sub 3}.

  15. Effects of VOCs on herbaceous plants in an open-top chamber experiment

    Energy Technology Data Exchange (ETDEWEB)

    Cape, J.N.; Leith, I.D.; Binnie, J.; Content, J.; Donkin, M.; Skewes, M.; Price, D.N.; Brown, A.R.; Sharpe, A.D

    2003-07-01

    Birdsfoot trefoil and broad-leaved dock were affected by VOCs. - A selection of herbaceous plants representing the ground flora around a typical chemical installation in the UK was exposed continuously for 7 weeks to a mixture of six VOCs (acetone, acetonitrile, dichloromethane, ethanol, methyl t-butyl ether and toluene) in open-top chambers. Exposure concentrations were based on predictions of atmospheric dispersion from a single source, at a distance of approximately 2 km. The effects of continuous exposure, representing a worst-case, were measured in terms of uncontrolled water loss from leaves, leaf wettability, chlorophyll content and fluorescence, dry matter production and detailed observations of changes in plant growth and phenology. There were significant effects of VOC exposure on seed production, leaf water content and photosynthetic efficiency in some plant species. Such effects may be detectable in vegetation close to major industrial point sources of VOCs, or as a result of an accidental release of material during manufacture or transport. Some of the species tested e.g. birdsfoot trefoil (Lotus corniculatus L.) seem to be promising as potential bioindicators for VOCs, but there may be other even more sensitive species waiting to be discovered. However, the most obvious and conveniently measured response to VOC exposure in the birdsfoot trefoil (premature senescence i.e. advanced timing of seed pod production) could easily be confused in the field with climatic influences. It is also uncertain at this stage whether any of the effects observed would lead to longer term ecological changes in natural plant communities, through biased competition between sensitive and more tolerant species.

  16. Impacts of ozone on the biomass and yield of rice in open-top chambers

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    The impacts of different O3 concentration on the biomass andyield of rice were studied by using OTC-1 open-top chambers. Experimental treatments included the activated charcoal-filtered air (CFA), 50nl/L (CF50), 100nl/L (CF100) and 200nl/L (CF200) concentrations of O3. The O3 treatments significantly decreased the total biomass per plant. The elevated O3 exposure resulted in a more decrease in the root growth than in the shoot growth. Assessments of yield characteristics at the final harvest revealed an O3 - induced decrease in the number of grains per plant, resulting from fewer ears per plant, fewer grains per ear and more unfilled grains per ear. The 1000 grain dry weight and the harvest index (HI) were not changed significantly under 50nL/L or 100nL/L O3 exposure, but reduced by 17.0% and 4.8% by 200nL/L O3 treatment, respectively. Compared to the CFA treatment, CF50, CF100 and CF200 treatments caused a 8.2%, 26.1%, 49.1% decrease of the grain yield per plant, and a 14.2%, 31.7%, 51.7% decrease of the total biomass per plant, respectively. Linear regression showed that the 7h-daily mean O3 concentration exposure for 3 months (July-September) and AOT40 (cumulative exposure accumulation over threshold 40 nL/L) were well correlated with the relative grain yield. A yield loss of 10% was estimated to be at 46.9nL/L O3 for 7h-daily mean O3 concentration exposure or at 12930 nL/(L.h )O3 for AOT40.

  17. Whole System Carbon Exchange of Small Stands of Pinus Ponderosa Growing at Different CO{sub 2} concentrations in open top chambers

    Energy Technology Data Exchange (ETDEWEB)

    Ball, J. Timothy; Ross, Peter D.; Picone, John B.; Eichelmann, Hillar Y.; Ross, Gregory N.

    1996-12-01

    Functional understanding of the carbon cycle from the molecular to the global level is a high scientific priority requiring explanation of the relationship between fluxes at different spatial and temporal scales. We describe methods used to convert an open top chamber into both closed and open flow gas exchange systems utilized to measure such fluxes. The systems described consist of temporary modifications to an open top chamber, and are put in place for several days on one or several open top chambers. In the closed system approach, a chamber is quickly sealed for a short, predetermined time interval, the change in gas concentrations is measured, then the chamber is unsealed and ventilated. In the open flow system approach, airflow into the open top chamber is measured by trace gas injection, and the air stream concentration of CO{sub 2} and water vapor is measured before and after injection into the chamber. The closed chamber approach can resolve smaller fluxes, but causes transient increases in chamber air temperature, and has a high labor requirement. The open flow approach reduces the deviation of measuring conditions from ambient, may be semi-automated (requiring less labor), allows a more frequent sampling interval, but cannot resolve low fluxes well. Data demonstrating the capabilities of these systems show that, in open canopies of ponderosa pine, scaling fluxes from leaves to whole canopies is well approximated from summation of leaf P{sub s} rates. Flux measurements obtained from these systems can be a valuable contribution to our understanding whole system material fluxes, and challenge our understanding of ecosystem carbon budgets.

  18. Aprendizagens e novas tecnologias

    Directory of Open Access Journals (Sweden)

    Pedro Demo*

    2011-06-01

    Full Text Available Pretendo aqui, muito preliminarmente, reunir alguns argumentos favoráveis à multiplicidade de oportunidades de aprender que o aluno pode encontrar hoje em ambientes de aprendizagem mediados por novas tecnologias. Centro-me principalmente na desconstrução de algumas resistências pedagógicas (EVANS, 2001 ainda persistentes entre nós como “transmissão de conteúdos”; agarramento a uma única teoria; fixação na aula instrucionista; extirpação/endeusamento de processos avaliativos, etc. Procuro ver, em um vasto âmbito de ofertas teóricas, componentes atualmente ressaltados na discussão tecnológica em vigor, com o objetivo de indicar oportunidades de reconstrução muito aproveitável de autores e clássicos, uma vez que aprender bem não foi algo inventado pelas novas tecnologias; sempre existiu e os grandes pedagogos tiveram consciência disso, insinuando infinitas maneiras de aprender bem (DEMO, 2008. As novas tecnologias proporcionam oportunidades ainda mais ampliadas, em meio também a enormes riscos e desacertos. O que menos interessa aqui é incidir em panaceias tecnológicas, bem a gosto do consumismo neoliberal. Interessa, porém, explorar novas oportunidades de aprendizagem, bem mais centradas na atividade dos alunos, flexíveis, motivadoras e capazes de sustentar processos de autoria e autonomia.

  19. Application of the finite element method in the structural design of the main magnets, vacuum chambers and resonators of an open sector cyclotron

    Directory of Open Access Journals (Sweden)

    J. A. Strasheim

    1984-03-01

    Full Text Available The central role played by finite element analysis in the structural design of the main magnets, vacuum chamber and resonator of a 200 MeV open sector cyclotron facility for the National Accelerator Centre at Faure, South Africa, is described. The design evolved through a series of conceptual layouts of the structures involved. A finite element model of a main magnet, a main magnet vacuum chamber, one of a resonator, three of a resonator vacuum chamber and three of a valley vacuum chamber have been drawn up so far.

  20. Diagnostic value of the anterior chamber depth of a globe on CT for detecting open-globe injury

    Energy Technology Data Exchange (ETDEWEB)

    Kim, Seong Yun; Lee, Jeong Hyun; Choi, Byung Se; Choi, Jin Woo; In, Hyun Sin; Kim, Sun Mi; Baek, Jung Hwan [University of Ulsan College of Medicine, Asan Medical Centre, Department of Radiology and Research Institute of Radiology, Seoul (Korea); Lee, Yong Jae [University of Ulsan College of Medicine, Asan Medical Centre, Department of Ophthalmology, Seoul (Korea)

    2010-05-15

    To determine the diagnostic value of the anterior chamber depth (ACD) of a globe as seen on CT for detecting open-globe injury. We enrolled 28 patients with unilateral open-globe injury confirmed by surgery and 28 controls with other types of orbital trauma. The diagnostic value of the difference of the ACDs between globes was evaluated by ROC analysis. The diagnostic performance of the following CT findings suggesting open-globe injury was also determined from independent analysis by two readers, i.e. change in the ACD and the globe contour, obvious volume loss of the globe, dislocated/deformed lens, intraocular foreign body/air and intraocular haemorrhage. The ACD measurements were possible only in 15 patients with open-globe injuries. A difference in the ACDs{>=}0.4 mm resulted in 0.85 of the area under the ROC curve with a sensitivity of 73% and specificity of 100% (p=0.0001). The presence of one or more of the CT findings had a sensitivity of 92%, specificity of 85% and diagnostic accuracy of 89%. Change in the ACD is a helpful CT finding for detecting open-globe injury. A difference in the ACDs {>=}0.4 mm is a helpful diagnostic criterion with excellent specificity. (orig.)

  1. NOVAS TECNOLOGIAS NO ENVELHECIMENTO

    Directory of Open Access Journals (Sweden)

    Rosa Maria Farah

    2010-02-01

    Full Text Available O Programa de Estudos Pós-Graduados em Gerontologia/PUC-SP desenvolve pesquisas em diversificadas linhas algumas das quais têm em comum o acolhimento à questão das novas tecnologias no envelhecimento. São investigações de caráter interdisciplinar que envolvem docentes-pesquisadores, orientandos de mestrado e de iniciação científica. Na área da educação a distância, a PUC-SP inaugura um trabalho em que o idoso interessado em avançar em seus conhecimentos é recebido em um ambiente virtual de aprendizagem, em que pode participar de cursos avançados de aquisição de novas linguagens e de navegação na Internet, cujas consequências são o investimento em uma via mais digna para o envelhecer no sentido de esse idoso sentir-se um ser ligado aos novos tempos em que a interatividade digital traz-lhe possibilidades ilimitadas de contatos com o outro, com o mundo enfim. A pesquisa sobre a inclusão cibersocial do idoso mostra o que significa colocar o idoso em contato com a Internet, quando este recebe, por meio das redes sociais, ofertas de várias ordens, e equipamentos que contornam limitações de ordem física ou motora. Além disso, o registro digital da memória do idoso, de sua história e referências também podem constituir conteudos preciosos para pesquisas. A relação do idoso com a informática pode situá-lo como um ator, produtor e reprodutor no ciberespaço. Isso significa que as vantagens do uso do computador fazem o idoso ganhar novo sentido na vida, na medida em que pode assim preencher o vazio causado pelas perdas que lhe vão ocorrendo, possibilitando que ele redimensione seu olhar para o presente e futuro. Palavras-chave: o sujeito-idoso nas novas tecnologias; novas tecnologias e envelhecimento; o idoso na educação a distância; internet na velhice.

  2. ISR Intersection Vacuum Chamber

    CERN Multimedia

    1975-01-01

    This special vacuum chamber presenting a lateral opening at the beam crossing point is one of the many chambers specifically designed for a particular experiment. Here it is shown during assembly at the ISR mechanical worshop.

  3. Flower evolution of alpine forbs in the open top chambers (OTCs) from the Qinghai-Tibet Plateau.

    Science.gov (United States)

    Zhang, Chan; Wang, Lin-Lin; Yang, Yong-Ping; Duan, Yuan-Wen

    2015-05-22

    Effects of global changes on biodiversity have been paid more and more attention world widely, and the open top chambers (OTCs) are the most common tools to study the effects of climatic warming on plant diversity. However, it remains unclear how flowers evolve under environmental changes, which could help us to understand the changes of plant diversity in the OTCs. We compared the insect diversity and pollen:ovule (P/O) ratio of eight outcrossing species with different life histories inside and outside the OTCs on the Qinghai-Tibet Plateau, to examine the effects induced by OTCs on the evolution of floral traits. In the OTCs, P/O ratio decreased in annuals, but increased in perennials, indicating an overall trend toward selfing in annuals. We found that the insect diversity differed significantly inside and outside the OTCS, with decreases of dipteran insects and bees. We concluded that changes of P/O ratio in the studied plant species might result from pollination failure, which might be the results of mismatch between flowering time and pollinator activities. We also suggested annuals might be in a more extinction risk than perennials in OTCs, if strong inbreeding depression occurs in these annual outcrossing plants.

  4. Limitations to soybean photosynthesis at elevated carbon dioxide in free-air enrichment and open top chamber systems.

    Science.gov (United States)

    Bunce, James A

    2014-09-01

    It has been suggested that the stimulation of soybean photosynthesis by elevated CO2 was less in free-air carbon dioxide enrichment (FACE) systems than in open top chambers (OTC), which might explain smaller yield increases at elevated CO2 in FACE systems. However, this has not been tested using the same cultivars grown in the same location. I tested whether soybean photosynthesis at high light and elevated CO2 (ambient+180 μmol mol(-1)) was limited by electron transport (J) in FACE systems but by ribulose-bisphosphate carboxylation capacity (VCmax) in OTC. FACE systems with daytime and continuous CO2 enrichment were also compared. The results indicated that in both cultivars examined, midday photosynthesis at high light was always limited by VCmax, both in the FACE and in the OTC systems. Daytime only CO2 enrichment did not affect photosynthetic parameters or limitations, but did result in significantly smaller yields in both cultivars than continuous elevation. Photosynthesis measured at low photosynthetic photon flux density (PPFD) was not higher at elevated than at ambient CO2, because of an acclimation to elevated CO2 which was only evident at low measurement PPFDs.

  5. Investigation on High Performance of 10m Semi Anechoic Chamber by using Open-Top Hollow Pyramidal Hybrid EM Wave Absorber

    Science.gov (United States)

    Kurihara, Hiroshi; Saito, Toshifumi; Suzuki, Yoshikazu; Nishikata, Atsuhiro; Hashimoto, Osamu

    The emission radiated from electric and electronic equipments is evaluated through OATS. Recently, it is not fully prepared the environment for OATS because of a variety of communication radiation sources (e.g., digital television broadcast and cellular phone station). Therefore, the EM anechoic chambers are becoming more and more important as EMI test site. On the other hand, the EM anechoic chambers are needed high performance in order to cut down EMI countermeasure cost and calculate the antenna factor. The objective of this paper is mainly to present the EM wave absorber design in order to obtain within ±2dB against the theoretical site attenuation values in the 10m semi anechoic chamber at 30MHz to 300MHz. We get the necessary reflectivity of EM wave absorber by the basic site attenuation equation. We design the open-top hollow pyramidal new hybrid EM wave absorber consisted of 180cm long dielectric loss foam and ferrite tiles. Then, we design the 10m semi anechoic chamber by using the ray-tracing simulation and construct it in the size of L24m×W15.2m×H11.2m. More over, we measure the site attenuation of the constructed 10m semi anechoic chamber by using the broadband calculable dipole antennas. As the result, we confirm the validity of the designed open-top hollow pyramidal new hybrid EM wave absorber.

  6. Open access to novel dual flow chamber technology for in vitro cell mechanotransduction, toxicity and pharamacokinetic studies

    Directory of Open Access Journals (Sweden)

    Knothe Tate Melissa L

    2007-12-01

    Full Text Available Abstract Background A major stumbling block for researchers developing experimental models of mechanotransduction is the control of experimental variables, in particular the transmission of the mechanical forces at the cellular level. A previous evaluation of state of the art commercial perfusion chambers showed that flow regimes, applied to impart a defined mechanical stimulus to cells, are poorly controlled and that data from studies in which different chambers are utilized can not be compared, even if the target stress regimes are comparable. Methods This study provides a novel chamber design to provide both physiologically-based flow regimes, improvements in control of experimental variables, as well as ease of use compared to commercial chambers. This novel design achieves controlled stresses through five gasket designs and both single- and dual-flow regimes. Results The imparted shear stress within the gasket geometry is well controlled. Fifty percent of the entire area of the 10 × 21 mm universal gasket (Gasket I, designed to impart constant magnitude shear stresses in the center of the chamber where outcome measures are taken, is exposed to target stresses. In the 8 mm diameter circular area at the center of the chamber (where outcome measures are made, over 92% of the area is exposed to the target stress (± 2.5%. In addition, other gasket geometries provide specific gradients of stress that vary with distance from the chamber inlet. Bench-top testing of the novel chamber prototype shows improvements, in the ease of use as well as in performance, compared to the other commercial chambers. The design of the chamber eliminates flow deviations due to leakage and bubbles and allows actual flow profiles to better conform with those predicted in computational models. Conclusion The novel flow chamber design provides predictable and well defined mechanical forces at the surface of a cell monolayer, showing improvement over previously tested

  7. Microscopical investigations on Norway spruces needles from the air pollution exclusion experiment in open-top-chambers at Edelmannshof; Mikroskopische Untersuchungen an Fichtennadeln aus dem Schadgasausschlussversuch in Open-Top-Kammern am Edelmannshof

    Energy Technology Data Exchange (ETDEWEB)

    Bauer, F.W.; Fink, S. [Freiburg Univ. (Germany). Inst. fuer Forstbotanik und Baumphysiologie

    1997-12-01

    Spruce needles from the trials with negative fumigation in the open-top-chambers at Edelmannshof were investigated microscopically. The collapsed mesophyll cells in needle cross-sections increased with age but showed no clear relation to the treatments. Within the chambers, a greater number of empty mesophyll cells indicated impact of sucking insects. The phloem structure showed no changes which could be related to the effects of any mineral deficiencies. Epiphytes were much more abundant upon the needle surfaces within the chambers, regardless of the treatments, in comparison to the field samples. This indicates a probable effect of higher moisture within the chambers. In epidermal cells, calcium oxalate was more frequent in the filtered chambers than in the unfiltered and the field samples, pointing to lower leaching losses under clean air. In the mesophyll, intercellular calcium oxalate crystals increased with age but showed no treatment effect; intracellular crystals were similar in all treatments and all age classes, so that this criterium does not show any hints for a decrease in membrane permeability due to ozone. (orig.)

  8. Effects of open-top chamber fumigations with ozone on three fungal leaf diseases of wheat and the mycoflora of the phyllosphere.

    Science.gov (United States)

    von Tiedemann, A; Weigel, H J; Jäger, H J

    1991-01-01

    Spring wheat (Triticum aestivum L. cv. Turbo) was exposed in open-top chambers to six different ozone levels (8-h daily means from 12.4 to 122 microg m(-3)), to non-filtered air and to chamberless field conditions for 31 days from seedling stage through ear emergence. Powdery mildew (Erysiphe graminis DC. f.sp. tritici Marchal) which developed during the exposure period was significantly enhanced from 0.3/0.6% (two chamber replicates), 1.2/2.1%, 0.9/2.2% in charcoal-filtered air (CF) to 1.5/1.6%, 3.7/4.3%, 4.4/4.6% at the highest level of ozone, on the flag leaf, second and third leaf position, respectively. Post-exposure inoculation with Septoria nodorum Berk. led to increases of disease severity on the flag leaf from 40.9/43.6% in CF to 66.3/70.6% at the highest ozone concentration and on the ears from 15.7/16.5% to 26.3/26.6%. In the same comparison, severity of spot blotch following inoculation with Bipolaris sorokiniana (Sacc.) Shoem. (syn. Helminthosporium sativum Pamm., King et Bakke) was increased on the flag leaf from 3.6/8.9% to 12.3/23.4%. The three diseases examined correlated significantly with the ozone treatments in fumigated chambers. Disease severity was enhanced even on undamaged plant tissue (flag leaves). Infections of the two facultative pathogens on lower leaf positions started only in part from visible ozone lesions, mildew did not start from such lesions. No significant effects of ozone in the chambers on the saprobial colonization of the phyllosphere were detected, whereas there were marked differences in this respect between plants from the field and the chambers. At the highest ozone treatment, contents of chlorophyll a and carotenoids on the second leaf position declined significantly, which was associated with symptoms of premature senescence. Senescing effects of ozone are therefore assumed to be one major factor in predisposing wheat for necrotrophic leaf pathogens. Surprisingly, injurious and predisposing effects of ozone were

  9. Tecnologia versus ação

    DEFF Research Database (Denmark)

    Villadsen, Kaspar

    2014-01-01

    Oconceito de tecnologia desenvolvido por Michel Foucault ocupa uma posição ambígua na pesquisa organizacional contemporânea. Por um lado, a noção foucaultiana de “tecnologias de poder” tornou-se uma ferramenta analítica chave para pesquisadores organizacionais que buscam compreender as complexida...

  10. Phytohormones in needles of spruce (Picea abies [L.] Karst.) under different levels of air pollution in the open-top chamber experiment at Edelmannshof

    Energy Technology Data Exchange (ETDEWEB)

    Christmann, A.; Frenzel, B. [Hohenheim Univ., Stuttgart (Germany). Inst. fuer Botanik

    1997-12-01

    The plant hormones ethylene (ACC, MACC), abscisic acid and indoleacetic acid were investigated between August 1988 and December 1989 in current-year and one-year-old needles of the twelve spruce trees of the Edelmannshof experiment. Data from this period do not allow to reliably differentiate between consequences of the reduced impact of immissions (open-top chambers receiving charcoal-filtered air) and individual differences of the trees investigated. The conditions are discussed that might have made such a differentiation possible but which were not fulfilled at Edelmannshof. (orig.)

  11. Multi-concentric-ring open-air ionization chamber for high-intensity X-ray beams

    Science.gov (United States)

    Nariyama, Nobuteru

    2014-11-01

    An ionization chamber with four concentric ring electrodes was used to measure doses of white, 10, 15 and 20 keV synchrotron X-ray beams. The ring-shaped electrodes, which had diameters less than 11.8 mm, collected charges independently only around the beam, excluding strong in-beam charges when the beams passed through a small hole in the electrode centers. As a result, under low saturation voltages, the measured dose rates were confirmed to correlate with the beam intensity when conversion factors calculated with a Monte Carlo code were employed. The influence of the assumed beam sizes and incident positions on the current was almost negligible, with the exception of the incident position dependence at 10 keV.

  12. Populations of Bemisia tabaci (Homoptera: Aleyrodidae) on cotton grown in open-top field chambers enriched with CO/sub 2/

    Energy Technology Data Exchange (ETDEWEB)

    Butler, G.D. Jr.; Kimball, B.A.; Mauney, J.R.

    1985-02-01

    Atmospheric CO/sub 2/ levels are anticipated to rise from the current ambient level of ca. 350 ..mu..l/liter to 500-600 ..mu..l/liter in the next 50 to 75 years. Plant scientists are artificially enhancing the CO/sub 2/ environment of crop plants to increase photosynthesis, which is currently limited by inadequate levels of CO/sub 2/. It is not known how increases of CO/sub 2/ might affect consumers in the food chain. Population levels of sweet potato whitefly (SPWF), Bermisiaa tabaci (Gennadius), were assessed with sticky traps placed in a field experiment wherein cotton was grown in open-top field chambers that were enriched with CO/sub 2/ at levels approaching 200% ambient concentration levels. Although trapping started at the first of June, only an occasional SPWF was caught until early August. At that time populations began to increase at an exponential rate similar to that observed in commercial cotton fields in Arizona and California in previous years. There was no difference in rate of buildup of SPWF in ambient and CO/sub 2/-enriched chambers in either wet or dry irrigation treatment. Thus, it seems that raised CO/sub 2/ levels, either natural or artificial, do not affect SPWF populations.

  13. Determination of PM10 and its ion composition emitted from biomass burning in the chamber for estimation of open burning emissions.

    Science.gov (United States)

    Sillapapiromsuk, Sopittaporn; Chantara, Somporn; Tengjaroenkul, Urai; Prasitwattanaseree, Sukon; Prapamontol, Tippawan

    2013-11-01

    Biomass samples including agricultural waste (rice straw and maize residue) and forest leaf litter were collected from Chiang Mai Province, Thailand for the burning experiment in the self-designed stainless steel chamber to simulate the emissions of PM10. The burning of leaf litter emitted the highest PM10 (1.52±0.65 g kg(-1)). The PM10-bound ions emitted from the burning of rice straw and maize residue showed the same trend, which was K(+)>Cl(-)>SO4(2-)>NH4(+)>NO3(-). However, the emissions from maize residue burning were ~1.5-2.0 times higher than those from the rice straw burning. The ion content emitted from leaf litter burning was almost the same for all ion species. Noticeably, K(+) and Cl(-) concentrations were ~2-4 times lower than those emitted from agricultural waste burning. It can be deduced that K(+) and Cl(-) were highly emitted from agricultural waste burning due to the use of fertilizer and herbicides in the field, respectively. Based on emission values obtained from the chamber, the pollutant emission rate from open burning was calculated. Burned areas in Chiang Mai Province were 3510 and 866 km(2) in 2010 and 2011, respectively. Forest burning was 71-88%, while agricultural land burning accounted for 12-29% (rice field: crop field=1:3) of total burned area. Therefore, emissions of PM10 from open burning in Chiang Mai were 3051 ton (2010) and 705 ton (2011). Major ions emitted from agricultural waste burning were found to be K(+) and Cl(-), while those from forest burning were SO4(2-) and K(+).

  14. Evaluation of physiological and biochemical responses of two rice (Oryza sativa L.) cultivars to ambient air pollution using open top chambers at a rural site in India.

    Science.gov (United States)

    Rai, Richa; Agrawal, Madhoolika

    2008-12-15

    Air pollutant concentrations are rising in India, causing potential threats to crop production. As air pollutants are known to interfere with physiological processes, this study was conducted to assess the relative responses of physiological and biochemical characteristics of two cultivars of rice (Oryza sativa L. cv. Saurabh 950 and NDR 97) leading to variable yield responses. Twelve hour monitoring of ambient concentrations of SO2, NO2 and O3 in filtered chambers (FCs), non-filtered chambers (NFCs) and open plots (OPs) showed that O3 was the main pollutant at the experimental site. Ozone concentrations often exceeded 40 ppb during anthesis but not during the vegetative growth period. Photosynthetic rate (Ps), stomatal conductance (g(s)) and Fv/Fm ratio, superoxide dismutase (SOD) and peroxidase (POD) activities and photosynthetic pigments, ascorbic acid, total phenolics and protein contents were assessed at different developmental stages and yield of grains were quantified. Lipid peroxidation, SOD and POD activities, ascorbic acid and total phenolics were higher, whereas Ps, g(s), Fv/Fm ratio and contents of protein and photosynthetic pigment were lower in plants of NFCs as compared to FCs. Yield decreased significantly in both cultivars grown in NFCs. NDR 97 showed less reductions in physiological characteristics, photosynthetic pigments and protein, but a greater increase in the antioxidative defense system as compared to Saurabh 950. Yield reduction was higher in NDR 97 than in Saurabh 950. This suggested that NDR 97 utilized more photosynthate in maintaining the metabolic machinery against O3 stress leading to lower translocation of photosynthate to reproductive parts. The study concluded that under natural field conditions, physiological and biochemical responses of plants varied with pollutant concentrations leading to different translocation strategies in plants, modifying their yield responses. NDR 97, a fast growing and high yielding cultivar was more

  15. A new Open Top Chamber designed to test in situ effects of climatic and atmospheric changes on nitrogen fixation in boreal forest floor mosses

    Science.gov (United States)

    Bringuier, Charline; Bradley, Robert; Bellenger, Jean-Philippe; Morin, Hubert; Lindo, Zoë

    2014-05-01

    Biological nitrogen fixation (BNF) by cyanobacteria dwelling in forest floor moss layers is an important determinant of boreal black spruce forest productivity. Recent studies have suggested that these BNF rates may increase with increasing atmospheric CO2 and increasing temperature, as predicted by current weather models. This potential increase in BNF may be offset, however, by increasing atmospheric deposition of nitrogen, or by increasing demands for phosphorus (i.e. driving nodular ATP content) and for micronutrients such as Mo, Va and Fe (i.e. co-factors of nitrogenase enzyme). In order to study the relative and interactive effects of these factors controlling in situ BNF rates in boreal forest floor moss layers, a new Open Top Chamber (OTC) was developed in summer of 2013. The chambers measure 1.60 cm dia. × 60 cm height, and are equipped with an automated CO2 delivery system designed to maintain atmospheric daytime CO2 concentrations at 800 ppm, as well as buried heating coils that increase soil temperature by 4 ° C for 3 weeks in springtime. These 2 experimental factors are crossed in a full factorial (2 × 2) design that is replicated in 4 complete blocks. Each of the 16 OTCs is divided into 4 compartments, each of which are assigned 1 of 4 sub-plot factors. These include chronic additions of either atmospheric nitrogen, phosphorus, micronutrients or a non-amended control. Staring in summer 2014, a series of measurements will be made to assess the effects of treatments on BNF rates, cyanobacterial colonization and soil nitrogen cycling. Our poster will describe in detail the design and operation of the OTCs, as well as their construction and maintenance costs.

  16. N2O fluxes over a corn field from an open-path, laser-based eddy covariance system and static chambers

    Science.gov (United States)

    Tao, L.; Pan, D.; Gelfand, I.; Abraha, M.; Moyer, R.; Poe, A.; Sun, K.; Robertson, P.; Zondlo, M. A.

    2015-12-01

    Nitrous oxide (N2O) is important greenhouse and ozone-depleting gase. Although many efforts have been paid to N2O emissions, the spatial and temporal variability of N2O emissions still subject to large uncertainty. Application of the eddy covariance method for N2O emissions research would allow continuous ecosystem level flux measurements. The caveat, however, is need for high precision and high frequency measurements in field. In this study, an open-path, quantum cascade-laser-based eddy covariance N2O sensor has been deployed nearly continuously since May 2015 over a corn field at the W.K. Kellogg Biological Station site in SW Michigan. The field precision of the N2O sensor was assessed to be 0.1 ppbv at 10 Hz, and the total consumption was ~ 40 W, allowing the system to be powered solely by solar panels. The stability of the sensor under different temperature and humidity was tested within an environmental chamber. Spectroscopic experiments and cospectra analyses were carried out to study specific corrections associated with the sensor for eddy covariance techniques, including the line broadening effect due to water vapor and high frequency flux attenuation owning to sample path averaging. Ogive analyses indicated that the high-frequency N2O flux loss due to various damping effects was comparable to those of the CO2 flux. The detection limit of flux was estimated to be 0.3 ng N s-1 m-2 with a flux averaging interval of 30 minutes. The results from the EC system were also compared with ground measurements by standard static chambers (SC). Overall, more than 150 individual chamber measurements were taken within the footprint of the EC system. We found good correlation between the EC and SC methods given the spatiotemporal differences between the two techniques (R2 = 0.75). Both methods detected increased emissions during afternoon as compared to morning and night hours. Differences between EC and SC were also studied by investigating spatial variability with a

  17. spark chamber

    CERN Multimedia

    A few cosmic rays pass through your body every second of every day, no matter where you are. Look at the spark chamber to your right – every flash is the track made by a cosmic ray from outer space. The spark chamber is filled with a special gas mixture. Cosmic rays knock electrons out of the atoms in the gas. These electrons accelerate towards high voltage metal strips layered throughout the chamber, creating sparks like little bolts of lightning.

  18. spark chamber

    CERN Multimedia

    A few cosmic rays pass through your body every second of every day, no matter where you are. Look at the spark chamber to your right – every flash is the track made by a cosmic ray from outer space. The spark chamber is filled with a special gas mixture. Cosmic rays knock electrons out of the atoms in the gas. These electrons accelerate towards high voltage metal strips layered throughout the chamber, creating sparks like little bolts of lightning.

  19. 三开门自动温室气体测定箱的应用效果%Effect of greenhouse gas measurement of three-side-open automated chamber

    Institute of Scientific and Technical Information of China (English)

    万运帆; 李玉娥; 刘运通; 高清竹; 秦晓波; 刘硕; 马欣

    2011-01-01

    为了降低农田自动温室气体测定箱在观测过程中对作物生长环境及作物生长的干扰,本研究在玉米大田环境条件下比较了一种新型的三开门 自动温室气体测定箱与传统单开门自动温室气体测定箱对环境空气温湿度、土壤温度与水分、玉米生长以及温室气体排放的影响.结果表明:三开门温室气体测定箱能显著减小与大田环境条件下的空气温度、湿度及土壤温度的差异;相对于单开门箱,三开门箱在箱体打开及关闭条件下气温平均低0.90和0.74℃,空气湿度平均增加1.36%和降低5.69%:在玉米小喇叭口期前土壤温度约降低2℃,小喇叭口期后差异不显著;对土壤水分的影响在玉米苗期有一定的作用,但差异小显著;三开 门箱相对于单开门箱能显著降低箱体对作物生长的影响,还能降低CO2平均通量值6.85%及N2O的平均通量值3.68%,而对CH4平均通量值基本无影响.因此,三开门箱相对于传统单开门自动温室气体测定箱能显著减小测定箱时观测环境及作物生长的干扰,应用这种箱体观测能更好地反映田间温室气体排放状况.%In order to decrease the disturbance of automatic chamber on crop growth and its growing environment during greenhouse gases measurement, the effect experiment of a three-side-open automated chamber on greenhouse gases measurement in maize field was conducted in compare with traditional open-at-top chamber. The experiment was to test the three-side-open chamber's character on ambient temperature, ambient relative humidity, soil temperature, soil moisture, crop growth and greenhouse gases emission. Results showed that in compare with traditional open-at-top chamber, the three-side-open chamber can significantly decrease the influence of chamber on ambient temperature, ambient relative humidity and soil temperature. It can decrease ambient temperature by 0.90℃and increase air relative humidity by 1

  20. wire chamber

    CERN Multimedia

    Proportional multi-wire chamber. Multi-wire detectors contain layers of positively and negatively charged wires enclosed in a chamber full of gas. A charged particle passing through the chamber knocks negatively charged electrons out of atoms in the gas, leaving behind positive ions. The electrons are pulled towards the positively charged wires. They collide with other atoms on the way, producing an avalanche of electrons and ions. The movement of these electrons and ions induces an electric pulse in the wires which is collected by fast electronics. The size of the pulse is proportional to the energy loss of the original particle. Proportional wire chambers allow a much quicker reading than the optical or magnetoscriptive readout wire chambers.

  1. Wire Chamber

    CERN Multimedia

    Magnetoscriptive readout wire chamber. Multi-wire detectors contain layers of positively and negatively charged wires enclosed in a chamber full of gas. A charged particle passing through the chamber knocks negatively charged electrons out of atoms in the gas, leaving behind positive ions. The electrons are pulled towards the positively charged wires. They collide with other atoms on the way, producing an avalanche of electrons and ions. The movement of these electrons and ions induces an electric pulse in the wires which is collected by fast electronics. The size of the pulse is proportional to the energy loss of the original particle.

  2. wire chamber

    CERN Multimedia

    1967-01-01

    Magnetoscriptive readout wire chamber.Multi-wire detectors contain layers of positively and negatively charged wires enclosed in a chamber full of gas. A charged particle passing through the chamber knocks negatively charged electrons out of atoms in the gas, leaving behind positive ions. The electrons are pulled towards the positively charged wires. They collide with other atoms on the way, producing an avalanche of electrons and ions. The movement of these electrons and ions induces an electric pulse in the wires which is collected by fast electronics. The size of the pulse is proportional to the energy loss of the original particle.

  3. Wire Chamber

    CERN Multimedia

    1986-01-01

    Two wire chambers made originally for the R807 Experiment at CERN's Intersecting Storage Rings. In 1986 they were used for the PS 201 experiment (Obelix Experiment) at LEAR, the Low Energy Antiproton Ring. The group of researchers from Turin, using the chambers at that time, changed the acquisition system using for the first time 8 bit (10 bit non linear) analog to digital conversion for incoming signals from the chambers. The acquisition system was controlled by 54 CPU and 80 digital signal processors. The power required for all the electronics was 40 kW. For the period, this system was one of the most powerful on-line apparatus in the world. The Obelix Experiment was closed in 1996. To find more about how a wire chamber works, see the description for object CERN-OBJ-DE-038.

  4. Tecnologia simplificada na enfermagem materno infantil

    Directory of Open Access Journals (Sweden)

    Selma Campestrini

    1991-09-01

    Full Text Available A autora apresenta três modelos de tecnologia simplificada da enfermagem materno infantil: o equipamento didático SEIO COBAIA para treinar exercícios e massagens da mama e mamilo; a peça indumentária SUPRETRAUMA - sutiã preventivo de traumatismo mamilar - usado por gestantes; e, a técnica para reverter mamilo umbilicado durante o puerperio imediato. Além de corroborar na promoção do aleitamento materno e na prevenção de desmame precoce, demonstra a possibilidade da enfermagem relacionar o saber teórico-científico com o saber tecnico-prático, na saúde da mulher e da criança, com tecnologia adequada às necessidades, à compreensão e ao bem estar da população.

  5. TECNOLOGIAS EM PROCESSOS DE INCLUSÃO

    OpenAIRE

    Rodrigues, Cleide Aparecida; Teixeira, Ricardo Antonio

    2007-01-01

    Este texto tem como propósito abordar alguns aspectos relacionados à importância e as contribuições das tecnologias de informação e comunicação(TICs) em processos de inclusão. Entendendo que uma das atribuições das tecnologias é a de favorecer às pessoas oportunidades de acesso ao conhecimento e à sociabilidade, as TICs possibilitam a inclusão digital na atuação do homem como agente transformador, capaz de promover as mudanças necessárias aos processos de inclusão. Neste sentido, as reflexões...

  6. Examination of Surface Temperature Modification by Open-Top Chambers along Moisture and Latitudinal Gradients in Arctic Alaska Using Thermal Infrared Photography

    Directory of Open Access Journals (Sweden)

    Nathan C. Healey

    2016-01-01

    Full Text Available Passive warming manipulation methodologies, such as open-top chambers (OTCs, are a meaningful approach for interpretation of impacts of climate change on the Arctic tundra biome. The magnitude of OTC warming has been studied extensively, revealing an average plot-level warming of air temperature that ranges between 1 and 3 °C as measured by shielded resistive sensors or thermocouples. Studies have also shown that the amount of OTC warming depends in part on location climate, vegetation, and soil properties. While digital infrared thermometers have been employed in a few comparisons, most of the focus of the effectiveness of OTC warming has been on air or soil temperature rather than tissue or surface temperatures, which directly translate to metabolism. Here we used thermal infrared (TIR photography to quantify tissue and surface temperatures and their spatial variability at a previously unavailable resolution (3–6 mm2. We analyzed plots at three locations that are part of the International Tundra Experiment (ITEX-Arctic Observing Network (AON-ITEX network along both moisture and latitudinal gradients spanning from the High Arctic (Barrow, AK, USA to the Low Arctic (Toolik Lake, AK, USA. Our results show a range of OTC surface warming from 2.65 to 1.27 °C (31%–10% at our three sites. The magnitude of surface warming detected by TIR imagery in this study was comparable to increases in air temperatures previously reported for these sites. However, the thermal images revealed wide ranges of surface temperatures within the OTCs, with some surfaces well above ambient unevenly distributed within the plots under sunny conditions. We note that analyzing radiometric temperature may be an alternative for future studies that examine data acquired at the same time of day from sites that are in close geographic proximity to avoid the requirement of emissivity or atmospheric correction for validation of results. We foresee future studies using TIR

  7. CO[sub 2] exchange and growth of the Crassulacean acid metabolism plant opuntia ficus-indica under elevated CO[sub 2] in open-top chambers

    Energy Technology Data Exchange (ETDEWEB)

    Cui, M.; Miller, P.M.; Nobel, P.S. (Univ. of California, Los Angeles, CA (United States))

    1993-10-01

    CO[sub 2] uptake, water vapor conductance, and biomass production of Opuntia ficus-indica, a Crassulacean acid metabolism species, were studied at CO[sub 2] concentrations of 370, 520, and 720 [mu]L L[sup [minus]1] in open-top chambers during a 23-week period. Nine weeks after planting, daily net CO[sub 2] uptake for basal cladodes at 520 and 720 [mu]L L[sup [minus]1] of CO[sub 2] was 76 and 98% higher, respectively, than at 370 [mu]L L[sup [minus]1]. Eight weeks after daughter cladodes emerged, their daily net CO[sub 2] uptake was 35 and 49% higher at 520 and 720 [mu]L L[sup [minus]1] of CO[sub 2], respectively, than at 370 L L[sup [minus]1]. Daily water-use efficiency was 88% higher under elevated CO[sub 2] for basal cladodes and 57% higher for daughter cladodes. The daily net CO[sub 2] uptake capacity for basal cladodes increased for 4 weeks after planting and then remained fairly constant, whereas for daughter cladodes, it increased with cladode age, became maximal at 8 to 14 weeks, and then declined. The percentage enhancement in daily net CO[sub 2] uptake caused by elevated CO[sub 2] was greatest initially for basal cladodes and at 8 to 14 weeks for daughter cladodes. The chlorophyll content per unit fresh weight of chlorenchyma for daughter cladodes at 8 weeks was 19 and 62% lower in 520 and 720 [mu]L L[sup [minus]1] of CO[sub 2], respectively, compared with 370 [mu]L L[sup [minus]1]. Despite the reduced chlorophyll content, plant biomass production during 23 weeks in 520 and 720 [mu]L L[sup [minus]1] of CO[sub 2] was 21 and 55% higher, respectively, than at 370 [mu]L L[sup [minus]1]. The root dry weight nearly tripled as the CO[sub 2] concentration was doubled, causing the root/shoot ratio to increase with CO[sub 2] concentration. During the 23-week period, elevated CO[sub 2] significantly increased CO[sub 2] uptake and biomass production of O. 35 refs., 4 figs., 1 tab.

  8. CO2 Exchange and Growth of the Crassulacean Acid Metabolism Plant Opuntia ficus-indica under Elevated CO2 in Open-Top Chambers.

    Science.gov (United States)

    Cui, M.; Miller, P. M.; Nobel, P. S.

    1993-01-01

    CO2 uptake, water vapor conductance, and biomass production of Opuntia ficus-indica, a Crassulacean acid metabolism species, were studied at CO2 concentrations of 370, 520, and 720 [mu]L L-1 in open-top chambers during a 23-week period. Nine weeks after planting, daily net CO2 uptake for basal cladodes at 520 and 720 [mu]L L-1 of CO2 was 76 and 98% higher, respectively, than at 370 [mu]L L-1. Eight weeks after daughter cladodes emerged, their daily net CO2 uptake was 35 and 49% higher at 520 and 720 [mu]L L-1 of C02, respectively, than at 370 [mu]L L-1. Daily water-use efficiency was 88% higher under elevated CO2 for basal cladodes and 57% higher for daughter cladodes. The daily net CO2 uptake capacity for basal cladodes increased for 4 weeks after planting and then remained fairly constant, whereas for daughter cladodes, it increased with cladode age, became maximal at 8 to 14 weeks, and then declined. The percentage enhancement in daily net CO2 uptake caused by elevated CO2 was greatest initially for basal cladodes and at 8 to 14 weeks for daughter cladodes. The chlorophyll content per unit fresh weight of chlorenchyma for daughter cladodes at 8 weeks was 19 and 62% lower in 520 and 720 [mu]L L-1 of CO2, respectively, compared with 370 [mu]L L-1. Despite the reduced chlorophyll content, plant biomass production during 23 weeks in 520 and 720 [mu]L L-1 of CO2 was 21 and 55% higher, respectively, than at 370 [mu]L L-1. The root dry weight nearly tripled as the C02 concentration was doubled, causing the root/shoot ratio to increase with CO2 concentration. During the 23-week period, elevated CO2 significantly increased CO2 uptake and biomass production of O. ficus-indica. PMID:12231958

  9. CO2 Exchange and Growth of the Crassulacean Acid Metabolism Plant Opuntia ficus-indica under Elevated CO2 in Open-Top Chambers.

    Science.gov (United States)

    Cui, M.; Miller, P. M.; Nobel, P. S.

    1993-10-01

    CO2 uptake, water vapor conductance, and biomass production of Opuntia ficus-indica, a Crassulacean acid metabolism species, were studied at CO2 concentrations of 370, 520, and 720 [mu]L L-1 in open-top chambers during a 23-week period. Nine weeks after planting, daily net CO2 uptake for basal cladodes at 520 and 720 [mu]L L-1 of CO2 was 76 and 98% higher, respectively, than at 370 [mu]L L-1. Eight weeks after daughter cladodes emerged, their daily net CO2 uptake was 35 and 49% higher at 520 and 720 [mu]L L-1 of C02, respectively, than at 370 [mu]L L-1. Daily water-use efficiency was 88% higher under elevated CO2 for basal cladodes and 57% higher for daughter cladodes. The daily net CO2 uptake capacity for basal cladodes increased for 4 weeks after planting and then remained fairly constant, whereas for daughter cladodes, it increased with cladode age, became maximal at 8 to 14 weeks, and then declined. The percentage enhancement in daily net CO2 uptake caused by elevated CO2 was greatest initially for basal cladodes and at 8 to 14 weeks for daughter cladodes. The chlorophyll content per unit fresh weight of chlorenchyma for daughter cladodes at 8 weeks was 19 and 62% lower in 520 and 720 [mu]L L-1 of CO2, respectively, compared with 370 [mu]L L-1. Despite the reduced chlorophyll content, plant biomass production during 23 weeks in 520 and 720 [mu]L L-1 of CO2 was 21 and 55% higher, respectively, than at 370 [mu]L L-1. The root dry weight nearly tripled as the C02 concentration was doubled, causing the root/shoot ratio to increase with CO2 concentration. During the 23-week period, elevated CO2 significantly increased CO2 uptake and biomass production of O. ficus-indica.

  10. wire chamber

    CERN Multimedia

    Multi-wire detectors contain layers of positively and negatively charged wires enclosed in a chamber full of gas. A charged particle passing through the chamber knocks negatively charged electrons out of atoms in the gas, leaving behind positive ions. The electrons are pulled towards the positively charged wires. They collide with other atoms on the way, producing an avalanche of electrons and ions. The movement of these electrons and ions induces an electric pulse in the wires which is collected by fast electronics. The size of the pulse is proportional to the energy loss of the original particle.

  11. wire chamber

    CERN Multimedia

    Was used in ISR (Intersecting Storage Ring) split field magnet experiment. Multi-wire detectors contain layers of positively and negatively charged wires enclosed in a chamber full of gas. A charged particle passing through the chamber knocks negatively charged electrons out of atoms in the gas, leaving behind positive ions. The electrons are pulled towards the positively charged wires. They collide with other atoms on the way, producing an avalanche of electrons and ions. The movement of these electrons and ions induces an electric pulse in the wires which is collected by fast electronics. The size of the pulse is proportional to the energy loss of the original particle.

  12. Wire chamber

    CERN Multimedia

    Multi-wire detectors contain layers of positively and negatively charged wires enclosed in a chamber full of gas. A charged particle passing through the chamber knocks negatively charged electrons out of atoms in the gas, leaving behind positive ions. The electrons are pulled towards the positively charged wires. They collide with other atoms on the way, producing an avalanche of electrons and ions. The movement of these electrons and ions induces an electric pulse in the wires which is collected by fast electronics. The size of the pulse is proportional to the energy loss of the original particle.

  13. wire chamber

    CERN Multimedia

    1985-01-01

    Multi-wire detectors contain layers of positively and negatively charged wires enclosed in a chamber full of gas. A charged particle passing through the chamber knocks negatively charged electrons out of atoms in the gas, leaving behind positive ions. The electrons are pulled towards the positively charged wires. They collide with other atoms on the way, producing an avalanche of electrons and ions. The movement of these electrons and ions induces an electric pulse in the wires which is collected by fast electronics. The size of the pulse is proportional to the energy loss of the original particle.

  14. PROMOCIONALIDADE TELEVISUAL EM TEMPOS DE NOVAS TECNOLOGIAS

    Directory of Open Access Journals (Sweden)

    Maria Lília Dias de Castro

    2016-10-01

    Full Text Available Tendo em vista o reconhecido predomínio da televisão privada no país, em canal aberto, o objetivo do presente trabalho é investigar as relações entre essa mídia e os elementos de caráter econômico e tecnológico nela imperantes, analisando seus efeitos na especificidade da produção discursiva televisual, sobretudo aquela de caráter promocional. Para tanto, discute as propriedades da televisão no país, influência dos fatores econômico e tecnológico, relação entre tecnologia e discurso televisual, e o exame dessas repercussões em um programa da emissora.   PALAVRAS-CHAVE: Televisão privada; economicismo e tecnologismo; produção discursiva; expansão e condensação; promocionalidade.     ABSTRACT Given the recognized predominance of private television in the country, in open channel, the objective of this study is to investigate the relationship between these media and the elements of economic  and technological character prevailing in it, analyzing their effects on specificity of televisual discourse production, especially that promotional character. Therefore, discusses the properties of television in the country, the influence of economic and technological factors, the relationship between technology and televisual discourse and examines the impacts on a broadcaster´s program. (TV Globo.   KEYWORDS: Private television; economism and technologism; discursive production; expansion and condensation; promotion     RESUMEN Dado el predominio reconocido de la televisión privada en el país, canal abierto, el objetivo de este estudio es investigar la relación entre los medios de comunicación y los elementos económicos y tecnológicos de carácter en que prevalecen, el análisis de sus efectos sobre la especificidad de la producción de discurso televisivo, especialmente que el carácter promocional. Por lo tanto, se analizan las propiedades de la televisión en el país, la influencia de los factores económicos y

  15. Inteligencia artificial e tecnologias da inteligencia

    OpenAIRE

    Jess, Gil Marcos

    2013-01-01

    Resumo: Este trabalho apresenta os resultados de um estudo bibliográfico de caráter qualitativo acerca dos Sistemas Tutorias Inteligentes, apresentando sua evolução no contexto histórico e analisando sua constituição e bases de estruturação. O objetivo principal é apresentar uma proposta de encaminhamento para a reformulação desses sistemas. Para tal procura-se estabelecer uma análise acerca dos modelos que o constituem bem como das Tecnologias da Inteligência que regulam a Inteligência Artif...

  16. As tecnologias do espírito

    OpenAIRE

    Sfez, Lucien; Universidade de Paris

    2008-01-01

    Ao número de violências simbólicas exercidas sobre cada um gostaria de acrescentar uma forma de violência singular: a violência intelectual. Aqui, estamops num terreno particular. Noções, conceitos, forçam-nos a pensar, a analisar, a escrever de uma certa maneira. Criamos essa nova bateria de instrumentos conceituais coercitivos de "tecnologias do espírito. A violência particular exercida por eles será discutida neste texto.

  17. Desafios e Tecnologias para Cidades do Futuro

    Directory of Open Access Journals (Sweden)

    Antonio Mendes Silva Filho

    2012-05-01

    Full Text Available Este artigo trata questões apresentadas em palestra deste autor onde foi discutido os atuais desafios das cidades urbanas e é feito prospecto destacando tecnologias que podem prover suporte a essa demanda. Nesse sentido, apresenta-se um diagnóstico da situação atual das cidades em função do processo de urbanização e apontam-se desafios a serem enfrentados pela sociedade para dotarem as cidades de infra-estrutura adequada para (possíveis cenários futuros de modo a torná-las prontas para atender esta demanda.

  18. Arte e tecnologia: intersecções

    Directory of Open Access Journals (Sweden)

    Paulo Bernardino

    2010-01-01

    Full Text Available Sendo a tecnologia uma constante na história da arte, que se constituiu essencialmente por imagens, procura-se perceber em que medida a tecnologia digital, vista aqui como um ponto de mudança na posição do sujeito face à produção criativa, interfere nos processos artísticos quanto a novas formulações a respeito do posicionamento do observador e do autor. Da intersecção que resulta dessa tecnologia com a criatividade, vemos a ideia da produção partilhada ganhar força e se constituir cada vez mais como uma vontade inerente à própria atitude do ato criativo. A obra ao ser revelada no desejo da interatividade, que se vai afirmando na requisição da participação do outro como elemento fundamental para a sua concretização, enuncia um posicionamento que se diferencia na forma e no resultado que se vincula pelos meios tecnológicos, quer em relação ao espaço quer em relação aos procedimentos. No campo dos estudos das artes, adivinha-se cada vez mais importante uma procura empenhada na constituição de um fio condutor, neutro e de alcance o mais universal possível, com o intuito de compreender uma componente ideológica que se pode revelar na atitude ideológica inerente à utilização das novas tecnologias. Procura-se perceber como é que o significado das imagens é coordenado e porque razão necessitamos, queremos e precisamos das imagens; por fim, envereda-se pelos procedimentos do sujeito face aos adventos digitais, na iminência de perceber de que modo somos afetados pela tecnologia digital e de que modo a interação interfere no posicionamento do sujeito face aos aspectos da criatividade.Being technologies always present throughout the art history, which is mainly constituted by images, we will try to understand in which extent digital technology, considered to us as a main structure in the way the viewer faces creative production, interferes with the artistic procedures. We will centre our attention in new

  19. ASACUSA's radio-frequency quadrupole decelerator, open to show the four-rod structure along the centre, which crosses 35 resonator chambers formed by the vertical partitions.

    CERN Multimedia

    Laurent Guiraud

    2000-01-01

    The Radio-Frequency Quadrupole, RFQD, which further decelerates antiprotons ejected from the Antiproton Decelerator (AD). Starting from a momentum of 100 MeV/c (kinetic energy 5.3 MeV), the RFQD delivers very-low-energy antiprotons, adjustable between 10 and 110 keV, to the experiment ASACUSA. In picture _02, the view from the upstream end shows its 4-rod structure, traversing 35 resonator chambers formed by the vertical partitions. The tank has an inner diameter of 390 mm and is pumped to a vacuum of a few E-8 Torr.

  20. Novas tecnologias: Novos Professores? Novos Saberes?

    Directory of Open Access Journals (Sweden)

    Daniele Cristina Mendes

    2008-11-01

    Full Text Available RESUMO:A integração da educação com a informação-comunicação precisa ter seu lugar repensado dentro das escolas. Neste artigo tento instigar reflexões no trato das questões referentes às novas tecnologias e suas implicações na leitura, na linguagem e na formação dos professores.PALAVRAS-CHAVE: Leitura, Internet, Formação DocenteABSTRACT:The integration of education with the information and communication, must have rethought its place within the schools. In this article I try to instigate reflections on issues concerning the treatment of new technologies and their implications for reading, in language and training of teachers.KEYWORDS: Reading, Internet, Teacher educationRecebido: 30/10/2008     Aceito:30/11/2008

  1. Chamber transport

    Energy Technology Data Exchange (ETDEWEB)

    OLSON,CRAIG L.

    2000-05-17

    Heavy ion beam transport through the containment chamber plays a crucial role in all heavy ion fusion (HIF) scenarios. Here, several parameters are used to characterize the operating space for HIF beams; transport modes are assessed in relation to evolving target/accelerator requirements; results of recent relevant experiments and simulations of HIF transport are summarized; and relevant instabilities are reviewed. All transport options still exist, including (1) vacuum ballistic transport, (2) neutralized ballistic transport, and (3) channel-like transport. Presently, the European HIF program favors vacuum ballistic transport, while the US HIF program favors neutralized ballistic transport with channel-like transport as an alternate approach. Further transport research is needed to clearly guide selection of the most attractive, integrated HIF system.

  2. Tecnologias y neuropsicologia: hacia una ciber-neuropsicologia

    National Research Council Canada - National Science Library

    Soto-Perez, Felipe; Franco Martin, Manuel; Jimenez Gomez, Fernando

    2010-01-01

    Las tecnologias han penetrado en todos los quehaceres del ser humano. Se han desarrollado numerosos impulsos tecnologicos en el campo de la neuropsicologia, pero estos no suelen ser de uso cotidiano...

  3. Contrato comunicacional y representaciones sociales de la tecnologia robotica

    National Research Council Canada - National Science Library

    Pineda, Alicia; Molero, Lourdes

    2011-01-01

    ... (situacion comunicativa) y las restricciones discursivas que operan en los procesos de produccion e interpretacion de discursos mediaticos, que estan relacionados con aplicaciones de la tecnologia robotica en el area de la salud...

  4. Como integrar las nuevas tecnologias en educacion inicial?

    National Research Council Canada - National Science Library

    Martinez, Jeanette

    2011-01-01

    .... El presente ensayo busca contribuir al analisis tematico del mismo, exponiendo una serie de ideas y reflexiones teorico-practicas para lograr una integracion adecuada de las nuevas tecnologias al...

  5. Una postura frente a la tecnologia en ambientes educativos

    National Research Council Canada - National Science Library

    Vasquez Rizo, Fredy Eduardo

    2010-01-01

    Este articulo es una reflexion relacionada con el impacto de la tecnologia en ambientes educativos y un analisis desde diferentes escenarios, teniendo en cuenta la posicion de los distintos protagonistas...

  6. Investigations of fine root and mycorrhizal development of Norway spruce (Picea abies (L.) Karst.) in the upper soil layers of the open-top chambers at Edelmannshof

    Energy Technology Data Exchange (ETDEWEB)

    Kottke, I.; Qian, M. [Tuebingen Univ. (Germany). Botanisches Inst.

    1997-12-01

    Fine root density and mycorrhizal development of Norway spruce (Picea abies (L.) Karts.) were investigated after one sampling date in the OTC-experimental plots Edelmannshof. No disturbance of development by stress from soil or fumigation treatments could be found. Surprisingly, the mycorrhizas of two trees fumigated by ambient air revealed higher FDA-hydrolysing activity than the mycorrhizas of the four trees fumigated by filtered air. This finding correlates to the higher leaching rate in the unfiltered air and may have compensated the loss by higher uptake rate of cations. This may explain why no deficiency of nutrients was found in the ambient air chambers. The probing date in early spring, however, may also have influenced the actual activity of the mycorrhizas of the different trees. (orig.)

  7. Cyclically controlled welding purge chamber

    Science.gov (United States)

    Gallagher, Robert L. (Inventor)

    1996-01-01

    An arrangement for butt-welding cylindrical sections of large, thin-wall tanks includes a rotatable mandrel with side-by-side sets of radial position adjusters. Each set of adjusters bears on one of the tank sections adjacent the seam, to prevent the sections from sagging out-of-round. The mandrel rotates relative to the welder, so that a continuous seam is formed. A purge chamber is fixed in position behind the seam at the weld head, and is flushed with inert gas. The purge chamber includes a two-sided structure which is contiguous with the cylindrical sections and a circumferential vane to form an open-ended tube-like structure, through which the radial position adjusters pass as the mandrel and cylindrical workpiece sections rotate. The tube-like structure is formed into a chamber by a plurality of movable gates which are controlled to maintain a seal while allowing adjusters to progress through the purge chamber.

  8. Measurement of N2O and CH4 soil fluxes from garden, agricultural and natural soils using both closed and open chamber systems coupled with high-precision CRDS analyzer

    Science.gov (United States)

    He, Yonggang; Jacobson, Gloria; Alexander, Chris; Fleck, Derek; Hoffnagel, John; Del Campo, Bernardo; Rella, Chris

    2013-04-01

    will present the results of testing done with the analyzer attached to both closed and open chamber systems to quantify fluxes of N2O and CH4 from active soil samples. The soil samples were collected by the University of Iowa from soil test sites used for studying the application of biochar as a soil amendment. Results will compare the two chamber methodologies and results from several soil sample types, garden, agricultural and natural. Preliminary results from laboratory measurements of soil core samples taken from a garden soil sample using the closed-system chamber method show N2O emission to be on the order of 5.67 x 10-2 μg/cm3*hr, which is in good agreement with the open-system chamber method tested on the same soil sample, which yielded fluxes of 6.01 x 10-2 μg/cm3*hr . Additional work presented will verify these initial results and will be compared to literature such as Hutchinsion and Livingston 1993 assessment of the bias of different chamber flux methodologies.

  9. TECNOLOGIA E SUBJETIVIDADE: INTIMIDADE MEDIADA POR COMPUTADORES

    Directory of Open Access Journals (Sweden)

    Márcia Moraes

    2006-06-01

    Full Text Available O artigo teve o objetivo de investigar a produção de subjetividade com base nas atuais tecnologias da informação, em particular do diário virtual. A fundamentação teórica da pesquisa levou em conta os enfoques de autores contemporâneos sobre o assunto, apostando numa perspectiva ontogenética, no tocante às relações homem/técnica. Nesse enfoque, destaca-se um processo de produção da subjetividade, no qual esta é efeito de conexões heterogêneas que articulam humanos e não humanos. Assim, a subjetividade é considerada como um dos efeitos da mediação técnica. A pesquisa de campo foi realizada com 10 sujeitos de diferentes cidades do Brasil. Para coletar dados, foi utilizado o questionário semi-estruturado. Os resultados indicam que o diário virtual produz novas formas de subjetividade, de amizades e de relações pessoais.

  10. Paesaggi sonori, tecnologia, multimedialità

    Directory of Open Access Journals (Sweden)

    Gioacchino Palma

    2011-09-01

    Full Text Available Il saggio costituisce una ampia riflessione sulle relazioni tra musica, paesaggio reale, paesaggio virtuale e tecnologia. Il paesaggio sonoro tecnologico pervade sempre più il nostro vissuto e ne trasforma le tradizionali percezioni, gli approcci all'ascolto. Occorre però abituarsi a distinzioni meno marcate rispetto al passato: esiste un paesaggio sonoro della vita reale e un paesaggio sonoro artificiale sempre più esteso che è quello presente nei contesti audiovisivi e multimediali: queste due aree si assomigliano sempre di più. Punto di partenza del saggio è la riflessione del teorico più rilevante in merito agli studi sul paesaggio: il musicologo canadese Murray Schafer, posta in confronto con altri rilevanti teorici, di diversa derivazione, che molto hanno contribuito allo sviluppo del settore (qualche esempio: Pierre Shaeffer, Simon Emmerson, Michel Chion. La riflessione si addentra inoltre nei territori del cinema, del multimediale, della musica elettronica, del design acustico. Conclude il saggio una "passeggiata musicale a braccetto coi media" che propone una prospettiva dell'ascolto del paesaggio diversa da quelle consuete.

  11. Doriot Climatic Chambers

    Data.gov (United States)

    Federal Laboratory Consortium — The Doriot Climatic Chambers are two, 60-feet long, 11-feet high, 15-feet wide chambers that are owned and operated by NSRDEC. The Doriot Climatic Chambers are among...

  12. Directed Energy Anechoic Chamber

    Data.gov (United States)

    Federal Laboratory Consortium — The Directed Energy Anechoic Chamber comprises a power anechoic chamber and one transverse electromagnetic cell for characterizing radiofrequency (RF) responses of...

  13. Actuator System with Dual Chambers

    DEFF Research Database (Denmark)

    2015-01-01

    (8), the lid having a shaft opening (17) for a shaft (6) coupled to the magnetic rotor (5), wherein the magnetic rotor (5), when inserted in the translator cylinder (2), is arranged to translate a linear movement of the translator cylinder (2) into a rotational movement of the magnetic rotor by using...... magnetic flux (82) interacting between the magnetic stator and the magnetic rotor, said rotational movements is being transferred through a shaft (6), the lid (8) with a shaft opening (17) arranged for receiving the shaft (6), wherein the shaft is arranged to make both the linear and the rotational...... movement in the shaft opening (17), the lid (8) being arranged for confining the second end (15) of the translator cylinder (2), the translator cylinder confined by the lid (8) forms,when divided by the magnetic rotor (5), a first chamber (TC) with a first volume and a second chamber(BC) with a second...

  14. Visible leaf injury in young trees of Fagus sylvatica L. and Quercus robur L. in relation to ozone uptake and ozone exposure. An Open-Top Chambers experiment in South Alpine environmental conditions

    Energy Technology Data Exchange (ETDEWEB)

    Gerosa, G. [Catholic University of Brescia, Department of Mathematics and Physics, Via dei Musei 41, 25125 Brescia (Italy); Marzuoli, R. [Catholic University of Brescia, Department of Mathematics and Physics, Via dei Musei 41, 25125 Brescia (Italy)], E-mail: riccardo.marzuoli@unicatt.it; Desotgiu, R.; Bussotti, F. [University of Florence, Department of Plant Biology, Piazzale delle Cascine 28, 50144 Florence (Italy); Ballarin-Denti, A. [Catholic University of Brescia, Department of Mathematics and Physics, Via dei Musei 41, 25125 Brescia (Italy)

    2008-03-15

    An Open-Top Chambers experiment on Fagus sylvatica and Quercus robur seedlings was conducted in order to compare the performance of an exposure-based (AOT40) and a flux-based approaches in predicting the appearance of ozone visible injuries on leaves. Three different ozone treatments (charcoal-filtered; non-filtered; and open plots) and two soil moisture treatments (watered and non-watered plots) were performed. A Jarvisian stomatal conductance model was drawn up and parameterised for both species and typical South Alpine environmental conditions, thus allowing the calculation of ozone stomatal fluxes for every treatment. A critical ozone flux level for the onset of leaf visible injury in beech was clearly identified between 32.6 and 33.6 mmol O{sub 3}m{sup -2}. In contrast, it was not possible to identify an exposure critical level using the AOT40 index. Water stress delayed the onset of the leaf visible injuries, but the flux-based approach was able to take it into account accurately. - Ozone fluxes are more accurate than AOT40 exposure index in predicting ozone visible foliar injury onset on beech seedlings in South Alpine environmental conditions.

  15. TECNOLOGIA ASSISTIVA – UMA REVISÃO DO TEMA

    Directory of Open Access Journals (Sweden)

    Patrícia Rocha Rodrigues

    2014-01-01

    Full Text Available Este artigo tem como objetivo destacar a necessidade de ampliação das discussões a respeito da Tecnologia Assistiva, nos diversos espaços acadêmicos e sociais. Para isso, faz uma revisão sobre o tema, destacando os fatores que têm contribuído para sua emergência na atualidade, bem como a evolução conceitual que tem sofrido e as relações que se estabelecem com as Tecnologia da Informação e Comunicação.

  16. Cineclubes Piratas: aparatos tradicionais com tecnologia imprópria

    OpenAIRE

    Gonring, Gabriel Menotti; UFES

    2015-01-01

    Acompanhando os primeiros anos de funcionamento de um cineclube pirata, esse artigo busca demonstrar como os dispositivos cinematográficos podem ser rearranjados utilizando novas tecnologias. Ao fazê-lo, examina a lógica por trás do processo de especificação da tecnologia mediática, prestando atenção tanto no engajamento direto com a distribuição e consumo de filmes quanto no estabelecimento de estruturas ancilares para a promoção e regulação destas atividades.

  17. Impedances of Laminated Vacuum Chambers

    Energy Technology Data Exchange (ETDEWEB)

    Burov, A.; Lebedev, V.; /Fermilab

    2011-06-22

    First publications on impedance of laminated vacuum chambers are related to early 70s: those are of S. C. Snowdon [1] and of A. G. Ruggiero [2]; fifteen years later, a revision paper of R. Gluckstern appeared [3]. All the publications were presented as Fermilab preprints, and there is no surprise in that: the Fermilab Booster has its laminated magnets open to the beam. Being in a reasonable mutual agreement, these publications were all devoted to the longitudinal impedance of round vacuum chambers. The transverse impedance and the flat geometry case were addressed in more recent paper of K. Y. Ng [4]. The latest calculations of A. Macridin et al. [5] revealed some disagreement with Ref. [4]; this fact stimulated us to get our own results on that matter. Longitudinal and transverse impendances are derived for round and flat laminated vacuum chambers. Results of this paper agree with Ref. [5].

  18. Engineering analyses of large precision cathode strip chambers for GEM

    Energy Technology Data Exchange (ETDEWEB)

    Horvath, J.A.; Belser, F.C.; Pratuch, S.M.; Wuest, C.R. [Lawrence Livermore National Lab., CA (United States); Mitselmakher, G. [Superconducting Super Collider Lab., Dallas, TX (United States); Gordeev, A. [Institute of Theoretical and Experimental Physics, Moscow (Russian Federation); Johnson, C.V. [Lawrence Livermore National Lab., CA (United States)]|[Superconducting Super Collider Lab., Dallas, TX (United States); Polychronakos, V.A. [Brookhaven National Lab., Upton, NY (United States); Golutvin, I.A. [Joint Institute for Nuclear Research, Dubna (Russian Federation)

    1993-10-21

    Structural analyses of large precision cathode strip chambers performed up to the date of this publication are documented. Mechanical property data for typical chamber materials are included. This information, originally intended to be an appendix to the {open_quotes}CSC Structural Design Bible,{close_quotes} is presented as a guide for future designers of large chambers.

  19. Actuator System with Dual Chambers

    DEFF Research Database (Denmark)

    2015-01-01

    The present invention relates to an actuator system with a magnetic lead screw (50), comprises a magnetic rotor (5) and a translator cylinder (2), the translator cylinder (2) comprises a magnetic stator (16), the translator cylinder (2) has a closed first end (14) and a second end confined by a lid...... (8), the lid having a shaft opening (17) for a shaft (6) coupled to the magnetic rotor (5), wherein the magnetic rotor (5), when inserted in the translator cylinder (2), is arranged to translate a linear movement of the translator cylinder (2) into a rotational movement of the magnetic rotor by using...... movement in the shaft opening (17), the lid (8) being arranged for confining the second end (15) of the translator cylinder (2), the translator cylinder confined by the lid (8) forms,when divided by the magnetic rotor (5), a first chamber (TC) with a first volume and a second chamber(BC) with a second...

  20. Supersonic Jet Interactions in a Plenum Chamber

    Directory of Open Access Journals (Sweden)

    K. M. Venugopal

    2004-07-01

    Full Text Available Understanding thè supersonic jet interactions in a plenum chamber is essential for thè design of hot launch systems. Static tests were conducted in a small-scale rocket motor ioaded with a typical nitramine propellaiit to produce a nozzle exit Mach number of 3. This supersonic jet is made to interact with plenum chambers having both open and closed sides. The distance between thè nozzle exit and thè back piate of plenum chamber are varied from 2. 5 to 7. 0 times thè nozzle exit diameter. The pressure rise in thè plenum chamber was measured using pressure transducers mounted at different locatìons. The pressure-time data were analysed to obtain an insight into thè flow field in thè plenum chamber. The maximum pressure exerted on thè back piate of plenum chamber is about 25-35 per cent. of thè maximum stagnation pressure developed in thè rocket motor. Ten static tests were carried out to obtain thè effect of axial distance between thè nozzle exit and thè plenum chamber back piate, and stagnation pressure in thè rocket motoron thè flow field in thè open-sided and closed-sided plenum chambers configurations.

  1. Design and commissioning of a semi-confined blast chamber

    Institute of Scientific and Technical Information of China (English)

    I.M. SNYMAN; F.J. MOSTERT; W. GRUNDLING

    2016-01-01

    This paper presents the design, test and analysis of a scaled cylindrical blast chamber. The blast chamber is a one-fifth dimensional size replica of the full-scale blast chamber (Emily). The blast chamber is semi-confined as one end is open. The scaled blast chamber is used to test concepts for closing the open end and allows the gas to vent at the same time. ANSYS AUTODYN calculated the pressure time histories for different closure scenarios. Comparing the results suggested a viable scenario, namely a structure consisting of a circular disc and a frame positioned at the open end of the blast chamber. The structure and cylindrical blast chamber were subjected to scaled blast tests and the pressure results are presented and discussed.

  2. A flux-based assessment of the effects of ozone on foliar injury, photosynthesis, and yield of bean (Phaseolus vulgaris L. cv. Borlotto Nano Lingua di Fuoco) in open-top chambers

    Energy Technology Data Exchange (ETDEWEB)

    Gerosa, Giacomo [Department of Mathematics and Physics, Universita Cattolica del Sacro Cuore, via dei Musei 41, 20125 Brescia (Italy); Marzuoli, Riccardo [Department of Mathematics and Physics, Universita Cattolica del Sacro Cuore, via dei Musei 41, 20125 Brescia (Italy); Fondazione Lombardia per l' Ambiente, piazza Diaz 9, 20123 Milano (Italy); Rossini, Micol; Panigada, Cinzia; Meroni, Michele; Colombo, Roberto [Remote Sensing of Environmental Dynamics Lab., DISAT, University of Milano-Bicocca, Piazza della Scienza 1, 20126 Milano (Italy); Faoro, Franco [Plant Pathology Institute, Universita di Milano, via Celoria 2, 20133 Milano (Italy); Iriti, Marcello, E-mail: marcello.iriti@unimi.i [Plant Pathology Institute, Universita di Milano, via Celoria 2, 20133 Milano (Italy)

    2009-05-15

    Stomatal ozone uptake, determined with the Jarvis' approach, was related to photosynthetic efficiency assessed by chlorophyll fluorescence and reflectance measurements in open-top chamber experiments on Phaseolus vulgaris. The effects of O{sub 3} exposure were also evaluated in terms of visible and microscopical leaf injury and plant productivity. Results showed that microscopical leaf symptoms, assessed as cell death and H{sub 2}O{sub 2} accumulation, preceded by 3-4 days the appearance of visible symptoms. An effective dose of ozone stomatal flux for visible leaf damages was found around 1.33 mmol O{sub 3} m{sup -2}. Significant linear dose-response relationships were obtained between accumulated fluxes and optical indices (PRI, NDI, DELTAF/F{sub m}{sup '}). The negative effects on photosynthesis reduced plant productivity, affecting the number of pods and seeds, but not seed weight. These results, besides contributing to the development of a flux-based ozone risk assessment for crops in Europe, highlight the potentiality of reflectance measurements for the early detection of ozone stress. - Ozone stomatal fluxes affect leaf cell viability, photosynthetic performance, optical properties and crop yield of bean.

  3. Evaluation of changes in lipid peroxidation, ROS production, surface structures, secondary metabolites and yield of linseed (Linum usitatissimum L.) under individual and combined stress of ultraviolet-B and ozone using open top chambers.

    Science.gov (United States)

    Tripathi, Ruchika; Agrawal, S B

    2013-08-01

    The individual and interactive effects of supplemental UV-B (sUV-B) (ambient + 7.2 kJ m(-2) d(-1)) and elevated O3 (ambient + 10 ppb) were evaluated under field conditions using open top chambers on two cultivars, Padmini and T-397 of linseed (Linum usitatissimum L.). Mean monthly surface level of O3 concentrations varied from 27.7 ppb to 59.0 ppb during the experimental period. Both UV-B and O03 induced the production of ROS (H2O2 and O2*-), resulting in significant damage of membranes due to lipid peroxidation and electrolyte leakage. Synthesis of secondary metabolites (flavonoids, anthocyanin, lignin and wax) was also enhanced in all the treatments, whereas biomass and yield were reduced. Alterations in frequency of stomata and wax distribution were also observed through scanning electron microscopy (SEM). Cultivar Padmini was found to be more sensitive because of higher damage of membrane vis-a-vis reduction in biomass and seed yield. However, concentrations of flavonoids, anthocyanin, lignin and wax were higher in T-397, suggesting its relative resistance against applied stress. Combined exposure of sUV-B and O3 was less harmful, as compared to their individual treatment. Among the three treatments, O3 was found to be more detrimental for overall growth and sUV-B for economic yield.

  4. Influences of elevated CO[sub 2] on CO[sub 2] uptake and biomass production for the CAM plant Opuntia ficus-indica in open-top chambers

    Energy Technology Data Exchange (ETDEWEB)

    Cui, M.; Miller, P.M.; Nobel, P.S. (Univ. of California, Los Angeles (United States))

    1993-06-01

    CO[sub 2] uptake, water vapor conductance, and biomass production of the CAM plant Opuntia ficus-indica were studied at the current and two elevated CO[sub 2] concentrations (plus 150 and plus 350 [mu]L L[sup [minus]1]) in open-top chambers over a 23-week period. Nine weeks after planting, daily net CO[sub 2] uptake for basal cladodes in the medium and the high CO[sub 2] treatments was 49% and 84% higher, respectively, than at the current CO[sub 2] concentration. Nine weeks after the first-daughter cladodes emerged, their daily net CO[sub 2] uptake was 35% and 49% higher, respectively, in the medium and the high CO[sub 2] treatments than at the current CO[sub 2] concentration. Despite significantly lower chlorophyll contents (19% and 62%, respectively) in the first-daughter cladodes, biomass production over 23 weeks in the medium and the high CO[sub 2] treatments was 22% and 50% higher, respectively, than for plants at the current CO[sub 2].

  5. LEP vacuum chamber, cross-section

    CERN Multimedia

    CERN PhotoLab

    1983-01-01

    Cross-section of the final prototype for the LEP vacuum chamber. The elliptic main-opening is for the beam. The small channel to the left is for the cooling water, to carry away the heat deposited by the synchrotron radiation. The square channel to the right houses the Non-Evaporable Getter (NEG) pump. The chamber is made from extruded aluminium. Its outside is clad with lead, to stop the synchrotron radiation emitted by the beam. For good adherence between Pb and Al, the Al chamber was coated with a thin layer of Ni. Ni being slightly magnetic, some resulting problems had to be overcome. See also 8301153.

  6. Welle tecnologia laser internationalization analysis US market

    OpenAIRE

    2016-01-01

    Welle Laser is a Brazilian company that manufactures marking and engraving machines mainly for large-scale industry segments providing solutions that help increase productivity. Welle laser has 60% market share in Brazil and decided to go internationally in 2015, mainly to increase revenues and diversify business risks. Welle opened an office in Switzerland and celebrated a contract with a Mexican company to distribute their machines in Mexico. The next step for Welle is expanding its operati...

  7. HISTÓRIA DA TECNOLOGIA NO DESENVOLVIMENTO HUMANO

    Directory of Open Access Journals (Sweden)

    João Victor Nogueira Okido

    2017-03-01

    Full Text Available O presente artigo tem como objetivo analisar o caminho percorrido pelo homem e o desenvolvimento da tecnologia na História. Pretende também, demonstrar os importantes aspectos que contribuíram para esse processo histórico. No decorrer do processo de desenvolvimento, a capacidade de criar materiais para aprimorar as suas limitações, gera alterações em sua estrutura física e intelectual. Neste estudo, pretendemos enfatizar que, nesse processo evolutivo, o homem desenvolve tecnologias e habilidades cada vez mais avançadas. Para isso, analisaremos essa evolução nas gerações do século XX a partir de 1940 e século XXI até 2010, do autor Daniel Portillo Serrano.

  8. Tecnologia dos sonhos em Artemidoro, Freud, Jung e nos Warlpiri

    Directory of Open Access Journals (Sweden)

    Abrahão de Oliveira Santos

    2014-08-01

    Full Text Available Apresentaremos distintas tecnologias dos sonhos: em Artemidoro, Freud, Jung e nos Warlpiri. Artemidoro revela a mensagem onírica imprescindível à condução do cidadão, com os elementos das instituições, da cidade, do cosmo. Com Freud, no moderno mundo europeu, o sonho recebe o sentido da interioridade. Outra leitura é de Carl Jung. O uso dos sonhos tem seu sentido histórico, se relacionando com as práticas de governo, os modos de condução da vida e da cidade. Para além das tradições eurodescendentes e mentalistas vigentes, apresentaremos a tecnologia coletiva dos sonhos dos Warlpiri e uma nova possibilidade de lidarmos com a experiência onírica.

  9. LEP vacuum chamber, early prototype

    CERN Multimedia

    CERN PhotoLab

    1978-01-01

    The structure of LEP, with long bending magnets and little access to the vacuum chamber between them, required distributed pumping. This is an early prototype for the LEP vacuum chamber, made from extruded aluminium. The main opening is for the beam. The small channel to the right is for cooling water, to carry away the heat deposited by the synchroton radiation from the beam. The 4 slots in the channel to the left house the strip-shaped ion-getter pumps (see 7810255). The ion-getter pumps depended on the magnetic field of the bending magnets, too low at injection energy for the pumps to function well. Also, a different design was required outside the bending magnets. This design was therefore abandoned, in favour of a thermal getter pump (see 8301153 and 8305170).

  10. Streamer chamber: pion decay

    CERN Multimedia

    1992-01-01

    The real particles produced in the decay of a positive pion can be seen in this image from a streamer chamber. Streamer chambers consist of a gas chamber through which a strong pulsed electric field is passed, creating sparks as a charged particle passes through it. A magnetic field is added to cause the decay products to follow curved paths so that their charge and momentum can be measured.

  11. Prototype multiwire proportional chamber

    CERN Multimedia

    1975-01-01

    Chambers of this type were initially developed within the Alpha project (finally not approved). They were designed such to minimize the radiation length with a view to a mass spectrometer of high resolution meant to replace the Omega detector. The chambers were clearly forerunners for the (drift) chambers later built for R606 with the novel technique of crimping the wires. See also photo 7510039X.

  12. Electromagnetic reverberation chambers

    CERN Document Server

    Besnier, Philippe

    2013-01-01

    Dedicated to a complete presentation on all aspects of reverberation chambers, this book provides the physical principles behind these test systems in a very progressive manner. The detailed panorama of parameters governing the operation of electromagnetic reverberation chambers details various applications such as radiated immunity, emissivity, and shielding efficiency experiments.In addition, the reader is provided with the elements of electromagnetic theory and statistics required to take full advantage of the basic operational rules of reverberation chambers, including calibration proc

  13. Refrigeration Test Chamber

    Data.gov (United States)

    Federal Laboratory Consortium — The enclosed and environmentally controlled chamber is able to test four units (single-phase) simultaneously at conditions ranging from tundra to desert temperatures...

  14. DORIOT CLIMATIC CHAMBERS

    Data.gov (United States)

    Federal Laboratory Consortium — The Doriot Climatic Chambers reproduce environmental conditions occurring anywhere around the world. They provide an invaluable service by significantly reducing the...

  15. Chamber for Growing and Observing Fungi

    Science.gov (United States)

    Pierson, Duane L.; Molina, Thomas C.

    2005-01-01

    A chamber has been designed to enable growth and observation of microcolonies of fungi in isolation from the external environment. Unlike prior fungus-growing apparatuses, this chamber makes it possible to examine a fungus culture without disrupting it. Partly resembling a small picture frame, the chamber includes a metal plate having a rectangular through-thethickness opening with recesses for a top and a bottom cover glass, an inlet for air, and an inlet for water. The bottom cover glass is put in place and held there by clips, then a block of nutrient medium and a moisture pad are placed in the opening. The block is inoculated, then the top cover glass is put in place and held there by clips. Once growth is evident, the chamber can be sealed with tape. Little (if any) water evaporates past the edges of the cover glasses, and, hence there is little (if any) need to add water. A microscope can be used to observe the culture through either cover glass. Because the culture is sealed in the chamber, it is safe to examine the culture without risking contamination. The chamber can be sterilized and reused.

  16. DELPHI time projection chamber

    CERN Multimedia

    1989-01-01

    The time projection chamber is inserted inside the central detector of the DELPHI experiment. Gas is ionised in the chamber as a charged particle passes through, producing an electric signal from which the path of the particle can be found. DELPHI, which ran from 1989 to 2000 on the LEP accelerator, was primarily concerned with particle identification.

  17. Fluidized bed combustion chamber

    Energy Technology Data Exchange (ETDEWEB)

    Kullendorff, A.; Wikner, J.

    1985-03-25

    The chamber is confined in a pressure vessel. The lower part of the chamber has tilted parallel gutters up to the height of the fluidized bed. The slope of the gutter walls is 5 degrees-15 degrees and the top area of the gutters is 1.3 to 3 times larger than their bottom.

  18. Target chambers for gammashpere

    Energy Technology Data Exchange (ETDEWEB)

    Carpenter, M.P.; Falout, J.W.; Nardi, B.G. [and others

    1995-08-01

    One of our responsibilities for Gammasphere, was designing and constructing two target chambers and associated beamlines to be used with the spectrometer. The first chamber was used with the early implementation phase of Gammasphere, and consisted of two spun-Al hemispheres welded together giving a wall thickness of 0.063 inches and a diameter of 12 inches.

  19. Climatic chamber ergometer

    CSIR Research Space (South Africa)

    Atkins, AR

    1968-01-01

    Full Text Available The design and calibration of an ergometer for exercising subjects during calorimetric studies in the climate chamber, are described. The ergometer is built into the climatic chamber and forms an integral part of the whole instrumentation system foe...

  20. BEBC bubble chamber

    CERN Multimedia

    1972-01-01

    Looking up into the interior of BEBC bubble chamber from the expansion cylinder. At the top of the chamber two fish-eye lenses are installed and three other fish-eye ports are blanked off. In the centre is a heat exchanger.

  1. The Mobile Chamber

    Science.gov (United States)

    Scharfstein, Gregory; Cox, Russell

    2012-01-01

    A document discusses a simulation chamber that represents a shift from the thermal-vacuum chamber stereotype. This innovation, currently in development, combines the capabilities of space simulation chambers, the user-friendliness of modern-day electronics, and the modularity of plug-and-play computing. The Mobile Chamber is a customized test chamber that can be deployed with great ease, and is capable of bringing payloads at temperatures down to 20 K, in high vacuum, and with the desired metrology instruments integrated to the systems control. Flexure plans to lease Mobile Chambers, making them affordable for smaller budgets and available to a larger customer base. A key feature of this design will be an Apple iPad-like user interface that allows someone with minimal training to control the environment inside the chamber, and to simulate the required extreme environments. The feedback of thermal, pressure, and other measurements is delivered in a 3D CAD model of the chamber's payload and support hardware. This GUI will provide the user with a better understanding of the payload than any existing thermal-vacuum system.

  2. CHAMBER OF COMMERCE INFORMATION

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    Experience Japan The Japanese Chamber of Commerce and Industry will further promote its Japan-experience program and seek cooperation with various Chinese institutions.Between early May and June 2007,the chamber organized a Chinese college student delegation to Japan with the support from its members in China.

  3. Ciberespaço e rituais: tecnologia, antropologia e criatividade

    Directory of Open Access Journals (Sweden)

    Diana Maria Gallicchio Domingues

    2004-06-01

    Full Text Available O ciberespaço provoca uma revolução antropológica sem precedentes. O autor propõe que as tecnologias interativas nos fazem retornar a formas de comunicação próximas a rituais tribais e religiosos e suas lógicas de participação e pensamentos mágicos. As interações do cibercorpo geram uma zona de intervalo entre o corpo e as tecnologias. A ciberarte explora qualidades artísticas e estéticas das tecnologias interativas oferecendo momentos onde o corpo interfaceado habita limites entre o mundo real e virtual. Diferentes tipos e níveis de interatividade, o princípio da mutabilidade, do efêmero, do vir a ser, em processos que demandam reciprocidade, implicação, colaboração, partilhando informações no ciberespaço são propostos em dois recentes projetos artísticos relacionados à herança cultural de rituais.Cyberspace provokes an unprecedented anthropological revolution. The author proposes that interactive technologies put back us into forms of communication closer to some tribal and religious rituals with their participative logics and magic thoughts. The cyberbody'interactions generate an interval zone, between body and technologies. Cyberart explores the aesthetic and artistic qualities of interactive technologies, offering moments where the interfaced body inhabits the limits between real and virtual worlds. Different kinds and levels of interactivity, the principle of mutability, of ephemeral, of come-into-being in process demanding reciprocity, collaboration, sharing information in cyberspace are proposed by commenting two recent artistic projects related to rituals and cultural heritage.

  4. Evaluation of Carbon Dioxide Dissipation within a Euthanasia Chamber

    Science.gov (United States)

    Djoufack-Momo, Shelly M; Amparan, Ashlee A; Grunden, Beverly; Boivin, Gregory P

    2014-01-01

    CO2 euthanasia is used widely for small laboratory animals, such as rodents. A common necessity in many animal research facilities is to euthanize mice in sequential batches. We assessed the effects of several variables on the time it took for CO2 to dissipate within a chamber. Using standard euthanasia time, changes in flow rate were compared between a slow 15% fill rate for 7 min, and a slow 15% followed by a rapid 50% filling for a total of 5 min. Additional variables assessed included the effects of opening the lid after the completion of chamber filling, turning the chamber over after completion of filling, and the use and removal of a cage from within the chamber. For all trials, CO2 levels in the chambers peaked between 50% and 80%. After the gas was turned off, the concentration of CO2 dropped to below 10% CO2 within 2 min, except when the lid was left on the chamber, where concentration levels remained above 10% after 20 min. CO2 dissipation was significantly faster when the chamber was turned upside down after filling. Significant interaction effects occurred among the factors of cage presence within the chamber, flow rate, and chamber position. Only leaving the lid on the chamber had any practical implication for delaying CO2 dissipation. We recommend that users allow 2 min for CO2 to clear from the chamber before subsequent euthanasia procedures, unless the chamber is manipulated to increase the dissipation rate. PMID:25199098

  5. Evaluation of carbon dioxide dissipation within a euthanasia chamber.

    Science.gov (United States)

    Djoufack-Momo, Shelly M; Amparan, Ashlee A; Grunden, Beverly; Boivin, Gregory P-

    2014-07-01

    CO₂ euthanasia is used widely for small laboratory animals, such as rodents. A common necessity in many animal research facilities is to euthanize mice in sequential batches. We assessed the effects of several variables on the time it took for CO₂ to dissipate within a chamber. Using standard euthanasia time, changes in flow rate were compared between a slow 15% fill rate for 7 min, and a slow 15% followed by a rapid 50% filling for a total of 5 min. Additional variables assessed included the effects of opening the lid after the completion of chamber filling, turning the chamber over after completion of filling, and the use and removal of a cage from within the chamber. For all trials, CO₂ levels in the chambers peaked between 50% and 80%. After the gas was turned off, the concentration of CO₂ dropped to below 10% COv within 2 min, except when the lid was left on the chamber, where concentration levels remained above 10% after 20 min. CO₂ dissipation was significantly faster when the chamber was turned upside down after filling. Significant interaction effects occurred among the factors of cage presence within the chamber, flow rate, and chamber position. Only leaving the lid on the chamber had any practical implication for delaying CO₂ dissipation. We recommend that users allow 2 min for CO₂ to clear from the chamber before subsequent euthanasia procedures, unless the chamber is manipulated to increase the dissipation rate.

  6. Aprendizagem e tecnologias: Tendências e desafios

    Directory of Open Access Journals (Sweden)

    Isolina Oliveira

    2015-11-01

    Full Text Available Digital technologies are designed to lead to learning and, in this sense, are increasingly adopted; however, its incorporation into daily practice and teaching-learning processes does not follow as quickly as one would expect. In turn, there seems to be a growing movement for investing more in the use of technologies than in encouraging change practices of teachers. This article intends to contribute to debate about challenges related to the use of digital technologies in people's lives and their relationship to new ways of learning. Analyzes trends in education, based on empirical evidence, emphasizing the use of digital technologies and seeks to situate them in the field of dialogical perspectives. These assume the dialogue as central concept in learning and research on practices and interactions in the new learning scenarios. As tecnologias digitais são projetadas como propiciadoras de aprendizagem e, neste sentido, são cada vez mais adotadas; no entanto, a sua incorporação nas práticas diárias e nos processos de ensino-aprendizagem não decorre tão rapidamente como se esperaria. Por sua vez, parece haver um movimento crescente no sentido de perspectivar o futuro para a aprendizagem investindo mais no uso das tecnologias do que no incentivo à mudança de práticas dos professores. Este artigo pretende contribuir para o debate em torno dos desafios suscitados com a naturalização das tecnologias digitais na vida das pessoas e sua relação com novos modos de aprender. Analisa tendências em educação, baseadas em evidências empíricas, enfatizando o uso das tecnologias digitais e procura situá-las no campo das perspectivas dialógicas que assumem o conceito de diálogo como central na aprendizagem e na investigação sobre práticas e interações nos novos cenários de aprendizagem.

  7. O ENSINO DA FILOSOFIA COMO UMA TECNOLOGIA DE GOVERNAMENTALIDADE

    OpenAIRE

    de Oliveira, Liliana Souza

    2016-01-01

    * Doutora em Educação pela Universidade Federal de Santa Maria (UFSM). Professora de Filosofia no Instituto Federal Farroupilha-Campus São Vicente do Sul/RS.O ensino da filosofia como uma tecnologia de governamentalidadeResumo: O presente trabalho insere-se nas discussões sobre o ensino da Filosofia. Pretendo a partir de uma inspiração foucaultiana analisar as condições de emergência do discurso sobre a importância da Filosofia no vestibular da Universidade Federal de Santa Maria (UFSM) e as ...

  8. Tecnologia vinagreira: desenvolvimento de novos produtos vinagreiros na ESAS

    OpenAIRE

    Laranjeira, Cristina; Ribeiro, Maria; Oliveira, Maria; Henriques, Marília; Ribeiro, Ana T.; Trindade, Carlos; Carvalho, José; Diogo, Maria; Lima, Maria; Ruivo, Paula Lúcia

    2013-01-01

    O vinagre é obtido por dupla fermentação alcoólica e acética de substâncias de origem agrícola, possuindo cada tipo um flavour particular, função dos substratos e tecnologia usados, mantendo gosto sui generis ácido. A sua aptidão tecnológica viabiliza o fabrico de múltiplos produtos, macerando especiarias, plantas, etc, conduzindo ao enriquecimento da matriz, cujo perfil químico ganha complexidade e novas características sensoriais/funcionais. A picklagem fresh pack é um proces...

  9. Coisas velhas em coisas novas: novas "velhas tecnologias"

    OpenAIRE

    Demo,Pedro

    2010-01-01

    A intenção é oferecer discussão atualizada em torno das espetaculares inovações tecnológicas, realçando tanto rompimento quanto continuidades. Assim como se defende que as tecnologias demonstram um sentido de convergência, também demonstram continuidades. Os hackers e outros defensores do software livre pregam liberdade e libertação, imaginando computador e internet como arenas da liberdade. Apenas em parte isto parece correto, também porque os mesmos hackers que se proclamam libertá...

  10. Making MUSIC: A multiple sampling ionization chamber

    Energy Technology Data Exchange (ETDEWEB)

    Shumard, B. [Argonne National Laboratory, Building 203 H-113, Argonne, IL 60439 (United States)]. E-mail: shumard@phy.anl.gov; Henderson, D.J. [Argonne National Laboratory, Building 203 H-113, Argonne, IL 60439 (United States); Rehm, K.E. [Argonne National Laboratory, Building 203 H-113, Argonne, IL 60439 (United States); Tang, X.D. [Argonne National Laboratory, Building 203 H-113, Argonne, IL 60439 (United States)

    2007-08-15

    A multiple sampling ionization chamber (MUSIC) was developed for use in conjunction with the Atlas scattering chamber (ATSCAT). This chamber was developed to study the ({alpha}, p) reaction in stable and radioactive beams. The gas filled ionization chamber is used as a target and detector for both particles in the outgoing channel (p + beam particles for elastic scattering or p + residual nucleus for ({alpha}, p) reactions). The MUSIC detector is followed by a Si array to provide a trigger for anode events. The anode events are gated by a gating grid so that only ({alpha}, p) reactions where the proton reaches the Si detector result in an anode event. The MUSIC detector is a segmented ionization chamber. The active length of the chamber is 11.95 in. and is divided into 16 equal anode segments (3.5 in. x 0.70 in. with 0.3 in. spacing between pads). The dead area of the chamber was reduced by the addition of a Delrin snout that extends 0.875 in. into the chamber from the front face, to which a mylar window is affixed. 0.5 in. above the anode is a Frisch grid that is held at ground potential. 0.5 in. above the Frisch grid is a gating grid. The gating grid functions as a drift electron barrier, effectively halting the gathering of signals. Setting two sets of alternating wires at differing potentials creates a lateral electric field which traps the drift electrons, stopping the collection of anode signals. The chamber also has a reinforced mylar exit window separating the Si array from the target gas. This allows protons from the ({alpha}, p) reaction to be detected. The detection of these protons opens the gating grid to allow the drift electrons released from the ionizing gas during the ({alpha}, p) reaction to reach the anode segment below the reaction.

  11. Double anterior chamber in a patient with glaucoma and microspherophakia

    Directory of Open Access Journals (Sweden)

    Hamid Khakshoor

    2011-01-01

    Full Text Available We report the case of a 16-year-old woman with microspherophakia and secondary open angle glaucoma. The patient presented with a membrane dividing the anterior chamber into two segments without edema or Descemet′s membrane detachment. Slit lamp biomicroscopy, Pentacam, and specular microscopy images were obtained. Double anterior chamber is primarily found in patients with anterior chamber anomalies when there is no history of surgery or trauma.

  12. PS wire chamber

    CERN Multimedia

    1970-01-01

    A wire chamber used at CERN's Proton Synchrotron accelerator in the 1970s. Multi-wire detectors contain layers of positively and negatively charged wires enclosed in a chamber full of gas. A charged particle passing through the chamber knocks negatively charged electrons out of atoms in the gas, leaving behind positive ions. The electrons are pulled towards the positively charged wires. They collide with other atoms on the way, producing an avalanche of electrons and ions. The movement of these electrons and ions induces an electric pulse in the wires which is collected by fast electronics. The size of the pulse is proportional to the energy loss of the original particle.

  13. OPAL Jet Chamber Prototype

    CERN Multimedia

    OPAL was one of the four experiments installed at the LEP particle accelerator from 1989 - 2000. OPAL's central tracking system consists of (in order of increasing radius) a silicon microvertex detector, a vertex detector, a jet chamber, and z-chambers. All the tracking detectors work by observing the ionization of atoms by charged particles passing by: when the atoms are ionized, electrons are knocked out of their atomic orbitals, and are then able to move freely in the detector. These ionization electrons are detected in the dirfferent parts of the tracking system. This piece is a prototype of the jet chambers

  14. Heat exchanger. [rocket combustion chambers and cooling systems

    Science.gov (United States)

    Sokolowski, D. E. (Inventor)

    1978-01-01

    A heat exchanger, as exemplified by a rocket combustion chamber, is constructed by stacking thin metal rings having microsized openings therein at selective locations to form cooling passages defined by an inner wall, an outer wall and fins. Suitable manifolds are provided at each end of the rocket chamber. In addition to the cooling channel openings, coolant feed openings may be formed in each of rings. The coolant feed openings may be nested or positioned within generally U-shaped cooling channel openings. Compression on the stacked rings may be maintained by welds or the like or by bolts extending through the stacked rings.

  15. ALICE Time Projection Chamber

    CERN Multimedia

    Lippmann, C

    2013-01-01

    The Time Projection Chamber (TPC) is the main device in the ALICE 'central barrel' for the tracking and identification (PID) of charged particles. It has to cope with unprecedented densities of charges particles.

  16. Vacuum chamber 'bicone'

    CERN Multimedia

    1977-01-01

    This chamber is now in the National Museum of History and Technology, Smithsonian Institution, Washington, DC, USA, where it was exposed in an exhibit on the History of High Energy Accelerators (1977).

  17. High rate drift chambers

    Energy Technology Data Exchange (ETDEWEB)

    Christian, D.C. (Fermilab, Batavia, IL 60510 (United States)); Berisso, M.C. (Fermilab, Batavia, IL 60510 (United States)); Gutierrez, G. (Fermilab, Batavia, IL 60510 (United States)); Holmes, S.D. (Fermilab, Batavia, IL 60510 (United States)); Wehmann, A. (Fermilab, Batavia, IL 60510 (United States)); Avilez, C. (Instituto de Fisica, Universidad de Guanajuato, Leon, Guanajuato (Mexico)); Felix, J. (Instituto de Fisica, Universidad de Guanajuato, Leon, Guanajuato (Mexico)); Moreno, G. (Instituto de Fisica, Universidad de Guanajuato, Leon, Guanajuato (Mexico)); Romero, M. (Instituto de Fisica, Universidad de Guanajuato, Leon, Guanajuato (Mexico)); Sosa, M. (Instituto de Fisica, Universidad de Guanajuato, Leon, Guanajuato (Mexico)); Forbush, M. (Department of Physics, Texas A and M University, College Station, TX 77843 (United States)); Huson, F.R. (Department of Physics, Texas A and M University, College Station, TX 77843 (United States)); Wightman, J.A. (Department of Physi

    1994-06-01

    Fermilab experiment 690, a study of target dissociation reactions pp[yields]pX using an 800 GeV/c proton beam and a liquid hydrogen target, collected data in late 1991. The incident beam and 600-800 GeV/c scattered protons were measured using a system of six 6 in.x4 in. and two 15 in.x8 in. pressurized drift chambers spaced over 260 m. These chambers provided precise measurements at rates above 10 MHz (2 MHz per cm of sense wire). The measurement resolution of the smaller chambers was 90 [mu]m, and the resolution of the larger chambers was 125 [mu]m. Construction details and performance results, including radiation damage, are presented. ((orig.))

  18. Toxic Test Chambers

    Data.gov (United States)

    Federal Laboratory Consortium — Description/History: Hazardous material test facility Both facilities have 16,000 cubic foot chambers, equipped with 5000 CFM CBR filter systems with an air change...

  19. Bubble chamber: antiproton annihilation

    CERN Multimedia

    1971-01-01

    These images show real particle tracks from the annihilation of an antiproton in the 80 cm Saclay liquid hydrogen bubble chamber. A negative kaon and a neutral kaon are produced in this process, as well as a positive pion. The invention of bubble chambers in 1952 revolutionized the field of particle physics, allowing real tracks left by particles to be seen and photographed by expanding liquid that had been heated to boiling point.

  20. Laser peripheral iridotomy changes anterior chamber architecture.

    Science.gov (United States)

    Theinert, Christian; Wiedemann, Peter; Unterlauft, Jan D

    2017-01-19

    The pressure gradient between anterior and posterior chamber in acute angle closure (AAC) and primary angle closure suspects is balanced by a sufficient laser peripheral iridotomy (LPI). The anterior chamber changes induced by LPI in patients with unilateral AAC were examined and compared to healthy eyes to define threshold values, which may help to discriminate between healthy and diseased eyes. Using Scheimpflug photography, anterior chamber depth (ACD), anterior chamber volume (ACV), anterior chamber angle (ACA), and central corneal thickness (CCT) were measured before and after LPI in both eyes of unilateral AAC cases. These measurements were compared to a group of healthy control eyes to determine threshold values for ACD, ACV, and ACA. The ACD, ACV, and ACA increased significantly in the 25 AAC eyes after LPI. The ACD, ACV, ACA, and CCT values in the AAC eyes obtained before LPI were compared to a control group of 59 healthy eyes with wide open chamber angles. The cutoff values revealed by receiver operating characteristic analysis were 2.1 mm for ACD, 90.5 mm2 for ACV, and 27.25° for ACA. Our results confirm the significant changes of the anterior segments architecture induced by LPI in AAC eyes. The found threshold values for ACD, ACV, and ACA may help in daily clinical routine to discriminate between healthy eyes and those in need for a prophylactic LPI.

  1. Improved Rhenium Thrust Chambers

    Science.gov (United States)

    O'Dell, John Scott

    2015-01-01

    Radiation-cooled bipropellant thrust chambers are being considered for ascent/ descent engines and reaction control systems on various NASA missions and spacecraft, such as the Mars Sample Return and Orion Multi-Purpose Crew Vehicle (MPCV). Currently, iridium (Ir)-lined rhenium (Re) combustion chambers are the state of the art for in-space engines. NASA's Advanced Materials Bipropellant Rocket (AMBR) engine, a 150-lbf Ir-Re chamber produced by Plasma Processes and Aerojet Rocketdyne, recently set a hydrazine specific impulse record of 333.5 seconds. To withstand the high loads during terrestrial launch, Re chambers with improved mechanical properties are needed. Recent electrochemical forming (EL-Form"TM") results have shown considerable promise for improving Re's mechanical properties by producing a multilayered deposit composed of a tailored microstructure (i.e., Engineered Re). The Engineered Re processing techniques were optimized, and detailed characterization and mechanical properties tests were performed. The most promising techniques were selected and used to produce an Engineered Re AMBR-sized combustion chamber for testing at Aerojet Rocketdyne.

  2. DELPHI Barrel Muon Chamber Module

    CERN Multimedia

    1989-01-01

    The module was used as part of the muon identification system on the barrel of the DELPHI detector at LEP, and was in active use from 1989 to 2000. The module consists of 7 individual muons chambers arranged in 2 layers. Chambers in the upper layer are staggered by half a chamber width with respect to the lower layer. Each individual chamber is a drift chamber consisting of an anode wire, 47 microns in diameter, and a wrapped copper delay line. Each chamber provided 3 signal for each muon passing through the chamber, from which a 3D space-point could be reconstructed.

  3. The KLOE drift chamber

    Energy Technology Data Exchange (ETDEWEB)

    Adinolfi, M.; Aloisio, A.; Ambrosino, F.; Andryakov, A.; Antonelli, A.; Antonelli, M.; Anulli, F.; Bacci, C.; Bankamp, A.; Barbiellini, G.; Bellini, F.; Bencivenni, G.; Bertolucci, S.; Bini, C.; Bloise, C.; Bocci, V.; Bossi, F.; Branchini, P.; Bulychjov, S.A.; Cabibbo, G.; Calcaterra, A.; Caloi, R.; Campana, P.; Capon, G.; Carboni, G.; Cardini, A.; Casarsa, M.; Cataldi, G.; Ceradini, F.; Cervelli, F.; Cevenini, F.; Chiefari, G.; Ciambrone, P.; Conetti, S.; Conticelli, S.; Lucia, E. De; Robertis, G. De; Sangro, R. De; Simone, P. De; Zorzi, G. De; Dell' Agnello, S.; Denig, A.; Domenico, A. Di; Donato, C. Di; Falco, S. Di; Doria, A.; Drago, E.; Elia, V.; Erriquez, O.; Farilla, A.; Felici, G.; Ferrari, A.; Ferrer, M.L.; Finocchiaro, G.; Forti, C.; Franceschi, A.; Franzini, P.; Gao, M.L.; Gatti, C.; Gauzzi, P.; Giovannella, S.; Golovatyuk, V.; Gorini, E.; Grancagnolo, F.; Grandegger, W.; Graziani, E.; Guarnaccia, P.; Hagel, U.V.; Han, H.G.; Han, S.W.; Huang, X.; Incagli, M.; Ingrosso, L.; Jang, Y.Y.; Kim, W.; Kluge, W.; Kulikov, V.; Lacava, F.; Lanfranchi, G.; Lee-Franzini, J.; Lomtadze, F.; Luisi, C.; Mao, C.S.; Martemianov, M.; Matsyuk, M.; Mei, W.; Merola, L.; Messi, R.; Miscetti, S.; Moalem, A.; Moccia, S.; Moulson, M.; Mueller, S.; Murtas, F.; Napolitano, M.; Nedosekin, A.; Panareo, M.; Pacciani, L.; Pages, P.; Palutan, M.; Paoluzi, L.; Pasqualucci, E.; Passalacqua, L.; Passaseo, M.; Passeri, A.; Patera, V.; Petrolo, E.; Petrucci, G.; Picca, D.; Pirozzi, G.; Pistillo, C.; Pollack, M.; Pontecorvo, L.; Primavera, M.; Ruggieri, F.; Santangelo, P.; Santovetti, E.; Saracino, G.; Schamberger, R.D.; Schwick, C.; Sciascia, B.; Sciubba, A.; Scuri, F.; Sfiligoi, I.; Shan, J.; Silano, P.; Spadaro, T.; Spagnolo, S.; Spiriti, E.; Stanescu, C.; Tong, G.L.; Tortora, L.; Valente, E.; Valente, P. E-mail: paolo.valente@lnf.infn.it; Valeriani, B.; Venanzoni, G.; Veneziano, S.; Wu, Y.; Xie, Y.G.; Zhao, P.P.; Zhou, Y

    2001-04-01

    The tracking detector of the KLOE experiment is 4 m diameter, 3.3 m length drift chamber, designed to contain a large fraction of the decays of low-energy K{sub L} produced at the Frascati DAPHINE phi-factory. The chamber is made by a thin carbon fiber structure and operated with a helium-based gas mixture in order to minimise conversion of low-energy photons and multiple scattering inside the sensitive volume. The tracking information is provided by 58 layers of stereo wires defing 12,582 cells, 2x2 cm{sup 2} in size in the 12 innermost layers and 3x3 cm{sup 2} in the outer ones. Details of the chamber design, calibration procedure and tracking performances are presented.

  4. The KLOE drift chamber

    CERN Document Server

    Adinolfi, M; Ambrosino, F; Andryakov, A; Antonelli, A; Antonelli, M; Anulli, F; Bacci, C; Bankamp, A; Barbiellini, G; Bellini, F; Bencivenni, G; Bertolucci, Sergio; Bini, C; Bloise, C; Bocci, V; Bossi, F; Branchini, P; Bulychjov, S A; Cabibbo, G; Calcaterra, A; Caloi, R; Campana, P; Capon, G; Carboni, G; Cardini, A; Casarsa, M; Cataldi, G; Ceradini, F; Cervelli, F; Cevenini, F; Chiefari, G; Ciambrone, P; Conetti, S; Conticelli, S; Lucia, E D; Robertis, G D; Sangro, R D; Simone, P D; Zorzi, G D; Dell'Agnello, S; Denig, A; Domenico, A D; Donato, C D; Falco, S D; Doria, A; Drago, E; Elia, V; Erriquez, O; Farilla, A; Felici, G; Ferrari, A; Ferrer, M L; Finocchiaro, G; Forti, C; Franceschi, A; Franzini, P; Gao, M L; Gatti, C; Gauzzi, P; Giovannella, S; Golovatyuk, V; Gorini, E; Grancagnolo, F; Grandegger, W; Graziani, E; Guarnaccia, P; Von Hagel, U; Han, H G; Han, S W; Huang, X; Incagli, M; Ingrosso, L; Jang, Y Y; Kim, W; Kluge, W; Kulikov, V; Lacava, F; Lanfranchi, G; Lee-Franzini, J; Lomtadze, F; Luisi, C; Mao Chen Sheng; Martemyanov, M; Matsyuk, M; Mei, W; Merola, L; Messi, R; Miscetti, S; Moalem, A; Moccia, S; Moulson, M; Müller, S; Murtas, F; Napolitano, M; Nedosekin, A; Panareo, M; Pacciani, L; Pagès, P; Palutan, M; Paoluzi, L; Pasqualucci, E; Passalacqua, L; Passaseo, M; Passeri, A; Patera, V; Petrolo, E; Petrucci, Guido; Picca, D; Pirozzi, G; Pistillo, C; Pollack, M; Pontecorvo, L; Primavera, M; Ruggieri, F; Santangelo, P; Santovetti, E; Saracino, G; Schamberger, R D; Schwick, C; Sciascia, B; Sciubba, A; Scuri, F; Sfiligoi, I; Shan, J; Silano, P; Spadaro, T; Spagnolo, S; Spiriti, E; Stanescu, C; Tong, G L; Tortora, L; Valente, E; Valente, P; Valeriani, B; Venanzoni, G; Veneziano, Stefano; Wu, Y; Xie, Y G; Zhao, P P; Zhou, Y

    2001-01-01

    The tracking detector of the KLOE experiment is 4 m diameter, 3.3 m length drift chamber, designed to contain a large fraction of the decays of low-energy K sub L produced at the Frascati DAPHINE phi-factory. The chamber is made by a thin carbon fiber structure and operated with a helium-based gas mixture in order to minimise conversion of low-energy photons and multiple scattering inside the sensitive volume. The tracking information is provided by 58 layers of stereo wires defing 12,582 cells, 2x2 cm sup 2 in size in the 12 innermost layers and 3x3 cm sup 2 in the outer ones. Details of the chamber design, calibration procedure and tracking performances are presented.

  5. Interface cena e tecnologia : composições cênicas mediadas

    OpenAIRE

    Martins, Larissa Hobi

    2013-01-01

    Partindo do pressuposto de que as artes no ocidente sempre dispuseram de recursos, suportes e dispositivos pertencentes ao seu contexto de época, pretende-se uma reflexão acerca de composições cênicas mediadas por tecnologias digitais. Tecnologias essas, que estão inseridas no cotidiano, passando também a compor experimentos artísticos, assumindo dessa forma um papel dialógico por meio da intersecção arte/tecnologia. Propõe-se assim investigar quais as relações que se estabelecem na cena teat...

  6. A interação estudante - tecnologia educacional digital em enfermagem neonatal

    OpenAIRE

    Fernanda Salim Ferreira de Castro

    2013-01-01

    É crescente o investimento de educadores em enfermagem em pesquisa e produção de objetos digitais de qualidade porque consideram que esta tecnologia oferece um futuro promissor para o processo ensino-aprendizagem. A interação homem-computador acontece através da interface, que deve ser amigável. Sabendo da importância dessa interação sentimo-nos instigadas em avaliar a interface de uma tecnologia educacional digital, junto ao usuário. Objetivo: Avaliar a interface da tecnologia educacio...

  7. Posing the first LEAR vacuum chamber

    CERN Multimedia

    1982-01-01

    The photo shows one of the four bending magnets of LEAR. They were of C-type with the opening ('mouth') to the outside of the ring (yoke to the inside). Last preparations are made before the vacuum chamber is slid through the mouth into the magnet. Stochastic cooling pickups/kickers were installed inside the chamber. One can distinguish a large number of feed-throughs on the chamber (leading to the pickup/kicker gaps). The free space in the middle of the block was left to offer room for an internal target in the magnet. This possibility was never exploited. Instead it is used here, to accommodate a pumping port for the high vacuum system. Michel Chanel (left) and Pierre Lefevre admire the mechanics at work.

  8. Thermal vacuum chamber repressurization with instrument purging

    Science.gov (United States)

    Woronowicz, Michael S.

    2016-09-01

    At the conclusion of cryogenic vacuum testing of the James Webb Space Telescope Optical Telescope Element Integrated Science Instrument Module (JWST-OTIS) in NASA Johnson Space Center's (JSCs) thermal vacuum (TV) Chamber A, contamination control (CC) engineers are postulating that chamber particulate material stirred up by the repressurization process may be kept from falling into the Integrated Science Instrument Module (ISIM) interior to some degree by activating instrument purge flows over some initial period before opening the chamber valves. This manuscript describes development of a series of models designed to describe this process. The models are strung together in tandem with a fictitious set of conditions to estimate overpressure evolution from which net outflow velocity behavior may be obtained. Creeping flow assumptions are then used to determine the maximum particle size that may be kept suspended above the ISIM aperture, keeping smaller particles from settling within the instrument module.

  9. Thermal Vacuum Chamber Repressurization with Instrument Purging

    Science.gov (United States)

    Woronowicz, Michael

    2017-01-01

    At the end of James Webb Space Telescope (JWST) OTIS (Optical Telescope Element-OTE-Integrated Science Instrument Module-ISIM) cryogenic vacuum testing in NASA Johnson Space Centers (JSCs) thermal vacuum (TV) Chamber A, contamination control (CC) engineers are mooting the idea that chamber particulate material stirred up by the repressurization process may be kept from falling into the ISIM interior to some degree by activating instrument purge flows over some initial period before opening the chamber valves. This memo describes development of a series of models designed to describe this process. These are strung together in tandem to estimate overpressure evolution from which net outflow velocity behavior may be obtained. Creeping flow assumptions are then used to determine the maximum particle size that may be kept suspended above the ISIM aperture, keeping smaller particles from settling within the instrument module.

  10. micro strip gas chamber

    CERN Multimedia

    1998-01-01

    About 16 000 Micro Strip Gas Chambers like this one will be used in the CMS tracking detector. They will measure the tracks of charged particles to a hundredth of a millimetre precision in the region near the collision point where the density of particles is very high. Each chamber is filled with a gas mixture of argon and dimethyl ether. Charged particles passing through ionise the gas, knocking out electrons which are collected on the aluminium strips visible under the microscope. Such detectors are being used in radiography. They give higher resolution imaging and reduce the required dose of radiation.

  11. Charpak hemispherical wire chamber

    CERN Multimedia

    1970-01-01

    pieces. Mesures are of the largest one. Multi-wire detectors contain layers of positively and negatively charged wires enclosed in a chamber full of gas. A charged particle passing through the chamber knocks negatively charged electrons out of atoms in the gas, leaving behind positive ions. The electrons are pulled towards the positively charged wires. They collide with other atoms on the way, producing an avalanche of electrons and ions. The movement of these electrons and ions induces an electric pulse in the wires which is collected by fast electronics. The size of the pulse is proportional to the energy loss of the original particle.

  12. Tecnologia NeredaTM aplicada à ETAR de Frielas

    OpenAIRE

    Doutor, Joana Raquel Claudino

    2008-01-01

    Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do grau de Mestre em Engenharia do Ambiente – Perfil Sanitária Desde o final do século XIX até aos dias de hoje verificou-se uma forte evolução nos sistemas de tratamento de águas residuais. Esta evolução foi fundamental para dar resposta às maiores exigências de qualidade do efluente tratado, pela necessidade de minimização do espaço ocupado pelas ETAR, pela simplificação da operação...

  13. Novas tecnologias, novas competências New Tecnologies, new skills

    Directory of Open Access Journals (Sweden)

    Geneviève Jacquinot Delaunay

    2008-01-01

    Full Text Available O texto aborda a relação dos jovens e adolescentes com tecnologias, nem "novas" nem "velhas", e sim instrumentos para informar e comunicar, divertir, auxiliar nos trabalhos escolares. Apesar de reconhecer a familiaridade dessa geração com o que há de mais avançado em termos de tecnologia, aponta a necessidade de se compreender a complexidade desse novo cenário de aprendizagem, que envolve o aprofundamento de conceitos como interatividade e interação, linguagem numérica, multimídia, internet e hipertexto. Na seqüência, faz uma análise do contato dos jovens com essa diversidade de meios, suas implicações no processo cognitivo e suas conseqüências comunicacionais. Finalmente, reconhece que a aprendizagem é hipercomplexa e que - apesar de todo avanço científico - a máquina, mesmo interativa, não pode proporcionar ao indivíduo o aprendizado que lhe proporciona a interação com outras pessoas.The paper discusses how young people relate to technology, not seen as new or old, but as an instrument to communicate and keep informed, amuse and to help in school projects. Although it is clear that the new generations are much more familiarized with new technology, the focus is on the need to understand the complexity of the new scenario, which requires a deeper understanding of the concepts of interactivity, multimedia, internet and hypertext. It is discussed how young people enter in contact with this diversity of instruments. It is stressed, however, that no matter how complex the computer can be, nothing can replace the role of interacting with other people in the learning process.

  14. Heavy liquid bubble chamber

    CERN Multimedia

    1965-01-01

    The CERN Heavy liquid bubble chamber being installed in the north experimental hall at the PS. On the left, the 1180 litre body; in the centre the magnet, which can produce a field of 26 800 gauss; on the right the expansion mechanism.

  15. OPAL Muon Chamber

    CERN Multimedia

    OPAL was one of the 4 experiments installed at the LEP particle accelerator from 1989 to 2000. This is a slice of the outermost layer of OPAL : the muon chambers. This outside layer detects particles which are not stopped by the previous layers. These are mostly muons.

  16. LEP Vacuum Chamber

    CERN Multimedia

    1983-01-01

    This is a cut-out of a LEP vacuum chamber for dipole magnets showing the beam channel and the pumping channel with the getter (NEG) strip and its insulating supports. A water pipe connected to the cooling channel can also be seen at the back.The lead radiation shield lining is also shown. See also 8305563X.

  17. Scanning bubble chamber pictures

    CERN Multimedia

    1974-01-01

    These were taken at the 2 m hydrogen bubble chamber. The photo shows an early Shiva system where the pre-measurements needed to qualify the event were done manually (cf photo 7408136X). The scanning tables were located in bld. 12. Gilberte Saulmier sits on foreground, Inge Arents at centre.

  18. Liquid Wall Chambers

    Energy Technology Data Exchange (ETDEWEB)

    Meier, W R

    2011-02-24

    The key feature of liquid wall chambers is the use of a renewable liquid layer to protect chamber structures from target emissions. Two primary options have been proposed and studied: wetted wall chambers and thick liquid wall (TLW) chambers. With wetted wall designs, a thin layer of liquid shields the structural first wall from short ranged target emissions (x-rays, ions and debris) but not neutrons. Various schemes have been proposed to establish and renew the liquid layer between shots including flow-guiding porous fabrics (e.g., Osiris, HIBALL), porous rigid structures (Prometheus) and thin film flows (KOYO). The thin liquid layer can be the tritium breeding material (e.g., flibe, PbLi, or Li) or another liquid metal such as Pb. TLWs use liquid jets injected by stationary or oscillating nozzles to form a neutronically thick layer (typically with an effective thickness of {approx}50 cm) of liquid between the target and first structural wall. In addition to absorbing short ranged emissions, the thick liquid layer degrades the neutron flux and energy reaching the first wall, typically by {approx}10 x x, so that steel walls can survive for the life of the plant ({approx}30-60 yrs). The thick liquid serves as the primary coolant and tritium breeding material (most recent designs use flibe, but the earliest concepts used Li). In essence, the TLW places the fusion blanket inside the first wall instead of behind the first wall.

  19. LEP vacuum chamber, prototype

    CERN Multimedia

    CERN PhotoLab

    1983-01-01

    Final prototype for the LEP vacuum chamber, see 8305170 for more details. Here we see the strips of the NEG pump, providing "distributed pumping". The strips are made from a Zr-Ti-Fe alloy. By passing an electrical current, they were heated to 700 deg C.

  20. Secondary emission gas chamber

    CERN Document Server

    In'shakov, V; Skvortsov, V

    2014-01-01

    For a hadron calorimeter active element there is considered a gaseous secondary emis-sion detector (150 micron gap, 50 kV/cm). Such one-stage parallel plate chamber must be a radiation hard, fast and simple. A model of such detector has been produced, tested and some characteristics are presented.

  1. Design of climate respiration chambers, adjustable to the metabolic mass of subjects

    NARCIS (Netherlands)

    Heetkamp, M.J.W.; Alferink, S.J.J.; Zandstra, T.; Hendriks, P.; Brand, van den H.; Gerrits, W.J.J.

    2015-01-01

    Open-circuit respiration chambers can be used to measure gas exchange and to calculate heat production (Q) of humans and animals. When studying short-term changes in Q, the size of the respiration chamber in relation to the subject of study is a point of concern. The washout time of a chamber, defin

  2. A pixelizacao dos muros: Graffiti urbano, tecnologias digitais e cultura visual contemporanea

    National Research Council Canada - National Science Library

    Campos, Ricardo

    2012-01-01

    ... das tecnologias e plataformas digitais de comunicacao. Tendo por base uma analise do graffiti existente na area metropolitana de Lisboa, procuramos desvendar outras facetas desta pratica cultural que, atualmente, nao vive exclusivamente da cidade...

  3. Cultura de trabajo para garantizar la sostenibilidad; eficiencia e impacto final de las tecnologias

    National Research Council Canada - National Science Library

    Senra, A

    2011-01-01

    ... basada en pastizales; en estos, la finalidad del ajuste sistematico de las tecnologias e innovaciones es para obtener exito y, simultaneamente, asegurar su impacto productivo final en el ecosistema...

  4. Síntese da Relação da Tecnologia com o Ser Humano e a Sociedade Sintesis de la relación de la tecnologia con el ser humano y la sociedad

    Directory of Open Access Journals (Sweden)

    Johnny Virgil

    2008-09-01

    Full Text Available O mundo moderno está povoado de tecnologias e, dentre elas, existem as chamadas tecnologias de informação e comunicação. Este artigo sintetiza a relação das tecnologias, em especial das tecnologias de informação e comunicação, com o ser humano e a sociedade, por meio de uma revisão de literatura. Constatou-se que as tecnologias em geral exercem um papel condicionante e modificador em ambos. As tecnologias de informação e comunicação provavelmente deixarão neles marcas indeléveis.

  5. Anechoic Radio Frequency Test Chamber

    Data.gov (United States)

    Federal Laboratory Consortium — This chamber is used for characterization test of such systems as communications gear, tanks, radar, missiles, and helicopters. The dimensions of the chamber are 114...

  6. 超声生物显微镜观察弹性开放襻前房型人工晶状体对眼前段结构的影响%The influence of flexible open-loop anterior chamber intraocular lens on the structure of ocular anterior segment

    Institute of Scientific and Technical Information of China (English)

    陈伟蓉; 刘奕志; 陈秀琦; 程冰; 刘玉华

    2001-01-01

    Objective To evaluate the therapeutic effects and safety offlexible open-loop anterior chamber intraocular lens (FOAC-IOL). Methods By ultrasound biomicroscopy, the positions of the haptics of FOAC-IOL in 20 patients (20 eyes) and the relationships of the haptics with iris and anterior chamber angle structures were observed postoperatively to evaluate the impact of these lenses on the structures of ocular anterior segment. Follow-up duration was from 6 to 20 months. Results Among 40 IOL′s haptics, twenty-six haptics were fixed at the recess of the chamber angle ;and other fourteen haptics penetrated the iris and invaded into the ciliary stroma, which caused recurrent uveitis. There was 1 eye with eccentric lens. There were 8 eyes with anterior synechiae of iris, which were related to the haptics of intraocular lens. Conclusions Ultrasound biomicroscopy works well in dynamic observation of the influence of intraocular lens on ocular anterior segment. The haptics of flexible open-loop anterior chamber intraocular lens should be modified.%目的 评价弹性开放襻一体型前房型人工晶状体(anterchamberintraocularlens,AC-IOL)植入术的疗效及其安全性。方法 应用超声生物显微镜观察20例(20只眼)弹性开放襻一体型AC-IOL植入术后患者IOL襻的位置,以及其与虹膜及房角结构的关系,从而评价IOL对眼前段结构的影响。随访时间6~20个月。结果 40个IOL襻中,26个襻固定于房角隐窝;14个襻(8只眼)穿过虹膜侵入至睫状体实质内,并伴有反复发作的葡萄膜炎。术后8只眼虹膜前粘连与IOL襻有关。结论超声生物显微镜检查是动态了解IOL对眼前段结构影响的有效方法。AC-IOL襻的设计有待进一步改进。

  7. Uma tecnologia com múltiplas aplicações

    Directory of Open Access Journals (Sweden)

    Pinheiro Márcia Margis

    2000-01-01

    Full Text Available O melhoramento vegetal vem sendo praticado pelo homem há milhares de anos. Entretanto, esse processo de domesticação tornou os vegetais mais susceptíveis a pragas e doenças. O melhoramento clássico permitiu, por cruzamento, a manipulação genética dos vegetais com conseqüente aumento na produtividade agrícola. Recentemente, a tecnologia do DNA recombinante ampliou as possibilidades de integração de genes exógenos ao genoma vegetal, resultando na produção das plantas transgênicas. Apesar das grandes discussões em torno do assunto, essas plantas representam hoje um caminho promissor para o melhoramento vegetal. Inúmeros exemplos de estratégias de transferência de genes conferiram, com sucesso, resistência a herbicidas, vírus, fungos, bactérias e insetos ou produziram um aumento na qualidade dos alimentos. Além das aplicações biotecnológicas, as plantas transgênicas têm contribuído significativamente para o estudo do funcionamento dos genes, tais como a análise da regulação da expressão gênica e o estudo das funções das proteínas codificadas pelos diferentes genes da planta.

  8. Fabricando corpos: ficção e tecnologia

    Directory of Open Access Journals (Sweden)

    Ieda Tucherman

    2008-09-01

    Full Text Available Desdobramento dos extensos estudos da autora sobre a ficção científica no cinema como narrativa representativa do mundo contemporâneo, o artigo enfoca especificamente as questões relacionadas ao corpo humano e à tecnologia que emergem dos filmes desse gênero nascido sob o signo da cultura visual médica. As narrativas fílmicas contemporâneas de ficção científica abrem espaço para reflexões sobre as sociedades atuais em mutação e para questionarmos até que ponto, diante da profunda interação homem-máquina, permanecemos ainda humanos. Palavras-chave: Ficção científica; cinema; tecnociência; corpo; subjetividade. ABSTRACT This article draws on my extensive studies on science fiction cinema as a form of narrative which represents contemporary world. The work focus specifically the questions related with the human body and the technology which emerges from sci fi films generated under the sign of medical visual culture. Contemporary filmic science fiction narratives give way to refletions over present mutating societies and to questioning how far, given the deep human-machine interaction, we are still human. Keywords: Science fiction; cinema; technoscience; body; subjectivity.

  9. Vacuum Chambers for LEP sections

    CERN Multimedia

    1983-01-01

    The picture shows sections of the LEP vacuum chambers to be installed in the dipole magnets (left) and in the quadrupoles (right). The dipole chamber has three channels: the beam chamber, the pumping duct where the NEG (non-evaporabe getter) is installed and the water channel for cooling (on top in the picture). The pumping duct is connected to the beam chamber through holes in the separating wall. The thick lead lining to shield radiation can also be seen. These chambers were manufactured as extruded aluminium alloy profiles.

  10. Multi-anode ionization chamber

    Energy Technology Data Exchange (ETDEWEB)

    Bolotnikov, Aleksey E. (South Setauket, NY); Smith, Graham (Port Jefferson, NY); Mahler, George J. (Rocky Point, NY); Vanier, Peter E. (Setauket, NY)

    2010-12-28

    The present invention includes a high-energy detector having a cathode chamber, a support member, and anode segments. The cathode chamber extends along a longitudinal axis. The support member is fixed within the cathode chamber and extends from the first end of the cathode chamber to the second end of the cathode chamber. The anode segments are supported by the support member and are spaced along the longitudinal surface of the support member. The anode segments are configured to generate at least a first electrical signal in response to electrons impinging thereon.

  11. TECNOLOGIAS E ENSINO DE ARTES VISUAIS – APONTAMENTOS INICIAIS DA PESQUISA

    Directory of Open Access Journals (Sweden)

    Maristani Polidori Zamperetti

    2016-01-01

    Full Text Available A presença das novas tecnologias no ambiente escolar, especificamente no ensino de Artes Visuais do município de Pelotas, RS, é um dos diversos temas estudados em uma pesquisa qualitativa, que está sendo realizada por meio da análise de entrevistas com professores de Arte do mesmo município. Este artigo se constitui como um dos primeiros desdobramentos desta pesquisa e visa de forma sucinta levantar as questões referentes à tecnologia e as novas tecnologias na sociedade atual, enfocando o uso destas no ambiente educacional e no ensino de Artes Visuais. O uso das novas tecnologias da informação e comunicação constitui-se uma realidade para nossa sociedade. Elas tornaram-se importantes e até mesmo indispensáveis em praticamente todos os âmbitos sociais. Alteraram de forma determinante os recursos e os meios para a comunicação e acesso à informação. Os espaços educativos não ficaram de fora das mudanças. A tecnologia adentrou (e tem adentrado o espaço escolar de modo a “modernizá-lo”, ou melhor, torná-lo contemporâneo aos avanços tecnológicos que foram sentidos pela sociedade, na qual ambas, sociedade e educação, tiveram que se adaptar neste processo de inserção das novas tecnologias. A pesquisa mostra que a inserção das novas tecnologias no Ensino de Artes Visuais enfrenta problemas de ordem material/física, constituindo-se num fator inibitório ou mesmo, impeditório à ação docente, visto que o professor depende diretamente dos recursos que dispõe para poder desenvolver suas aulas com boa qualidade.

  12. The APS ceramic chambers

    Energy Technology Data Exchange (ETDEWEB)

    Milton, S.; Warner, D.

    1994-07-01

    Ceramics chambers are used in the Advanced Photon Source (APS) machines at the locations of the pulsed kicker and bumper magnets. The ceramic will be coated internally with a resistive paste. The resistance is chosen to allow the low frequency pulsed magnet field to penetrate but not the high frequency components of the circulating beam. Another design goal was to keep the power density experienced by the resistive coating to a minimum. These ceramics, their associated hardware, the coating process, and our recent experiences with them are described.

  13. "Flat-Fish" vacuum chamber for the ISR

    CERN Multimedia

    1983-01-01

    The "Flat-Fish" vacuum chamber was a very special one for the ISR beam intersection I-4, inside the Split-Field Magnet. Technical descriptions are given with pictures 7802042 and 7712182. There were several generations of this chamber. This picture was taken during the last year of ISR operation. See also 7510230X, 7511123X, 7802039, 7802041. A flat-fish type vacuum chamber was also used at I-8, inside the Open Axial Field Magnet (OAFM, experiment 807 on large transverse momentum collision products), see 7901358.

  14. Drift chamber tests for the B1-spektrometer at ELSA

    Energy Technology Data Exchange (ETDEWEB)

    Hammann, Daniel [Physikalisches Institut, Bonn (Germany)

    2009-07-01

    At the Bonn electron accelerator ELSA photoproduction of mesons is studied at energies up to E{sub {gamma}}=3.5 GeV. Presently, a new experimental setup is being installed. To detect mixed charged final states, the BGO-Ball of the former GRAAL-Experiment is combined with an open magnetic spectrometer in forward direction. The spectrometer utilizes scintillating fibers for tracking in front of the magnet and large drift chambers behind the magnet. A prototype drift chamber has been tested for efficiency and position resolution. Testing of the full size chambers has started.

  15. HF production in CMS-Resistive Plate Chambers

    Energy Technology Data Exchange (ETDEWEB)

    Abbrescia, M. [Dipartimento interateneo di Fisica and sezione INFN, Bari (Italy); Colaleo, A. [Dipartimento interateneo di Fisica and sezione INFN, Bari (Italy); Guida, R. [Dipartimento interateneo di Fisica and sezione INFN, Bari (Italy)]. E-mail: Roberto.Guida@ba.infn.it; Iaselli, G. [Dipartimento interateneo di Fisica and sezione INFN, Bari (Italy); Loddo, F. [Dipartimento interateneo di Fisica and sezione INFN, Bari (Italy); Maggi, M. [Dipartimento interateneo di Fisica and sezione INFN, Bari (Italy); Marangelli, B. [Dipartimento interateneo di Fisica and sezione INFN, Bari (Italy); Natali, S. [Dipartimento interateneo di Fisica and sezione INFN, Bari (Italy); Nuzzo, S. [Dipartimento interateneo di Fisica and sezione INFN, Bari (Italy); Pugliese, G. [Dipartimento interateneo di Fisica and sezione INFN, Bari (Italy); Ranieri, A. [Dipartimento interateneo di Fisica and sezione INFN, Bari (Italy); Romano, F. [Dipartimento interateneo di Fisica and sezione INFN, Bari (Italy); Trentadue, R. [Dipartimento interateneo di Fisica and sezione INFN, Bari (Italy); Cavallo, N. [Universita degli studi della Basilicata and Sezione INFN, Naples (Italy); Fabozzi, F. [Universita degli studi della Basilicata and Sezione INFN, Naples (Italy); Paolucci, P. [Dipartimento di Fisica and Sezione INFN, Naples (Italy); Piccolo, D.; Polese, G.; Sciacca, C. [Dipartimento di Fisica and Sezione INFN, Naples (Italy); Belli, G.; Necchi, M.; Ratti, S.; Riccardi, C.; Torre, P.; Vitulo, P. [Dipartimento di Fisica Nucleare e Teorica and Sezione INFN, Pavia (Italy); Anguelov, T.; Genchev, V.; Panev, B.; Piperov, S.; Sultanov, G.; Vankov, P. [INRNE, BAS, Soa (Bulgaria); Litov, L.; Pavlov, B.; Petkov, P. [University of Soa St. Kliment Ohridski (Bulgaria)

    2006-08-15

    The formation of highly reactive compounds in the gas mixture during Resistive Plate Chambers (RPCs) operation at the CERN Gamma Irradiation Facility (GIF) is studied. Results from two different types of chambers are discussed: 50 x 50 cm{sup 2} RPC prototypes and two final CMS-RB1 chambers. The RB1 detectors were also connected to a closed loop gas system. Gas composition, possible additional impurities as well as fluoride ions have been monitored in different gamma irradiation conditions both in open and closed loop mode. The chemical composition of the RPC electrode surface has also been analyzed using an electron microscope equipped with an EDS/X-ray.

  16. Council Chamber exhibition

    CERN Multimedia

    CERN Bulletin

    2010-01-01

    To complete the revamp of CERN’s Council Chamber, a new exhibition is being installed just in time for the June Council meetings.   Panels will showcase highlights of CERN’s history, using some of the content prepared for the exhibitions marking 50 years of the PS, which were displayed in the main building last November. The previous photo exhibition in the Council Chamber stopped at the 1970s. To avoid the new panels becoming quickly out of date, photos are grouped together around specific infrastructures, rather than following a classic time-line. “We have put the focus on the accelerators – the world-class facilities that CERN has been offering researchers over the years, from the well-known large colliders to the lesser-known smaller facilities,” says Emma Sanders, who worked on the content. The new exhibition will be featured in a future issue of the Bulletin with photos and an interview with Fabienne Marcastel, designer of the exhibit...

  17. Os impactos das tecnologias dos jogos digitais multijogadores na jogabilidade social

    Directory of Open Access Journals (Sweden)

    Kastensmidt, Christopher Robert

    2010-01-01

    Full Text Available Este artigo apresenta como as diversas tecnologias usadas nos jogos digitais multijogadores podem impactar a jogabilidade social dos mesmos. O autor separa os jogos multijogadores em três categorias: os que são jogados presencialmente com outros jogadores, os que possibilitam a participação de jogadores remotos em tempo real, e os que funcionam de maneira assíncrona entre jogadores. Cada categoria é estudada em detalhe pelo ponto de vista das tecnologias utilizadas para operar aquele tipo de jogo. O estudo foca nas tecnologias mais socialmente relevantes, e por isso dados são fornecidos para mostrar a relativa penetração de cada tecnologia antes de estudá-la. Cada tecnologia é revista sobre a ótica dos recursos tecnológicos de input, processamento, exibição e transferência de dados fornecidos para o desenvolvimento de interações sociais dentro dos jogos digitais multijogadores

  18. Novas tecnologias aplicadas às embalagens de alimentos

    Directory of Open Access Journals (Sweden)

    Flávia De Floriani Pozza Rebello

    2009-12-01

    Full Text Available Com o desenvolvimento da indústria de alimentos, as embalagens têm se aperfeiçoado, indo além de sua função básica de proteger o alimento contra danos mecânicos e contaminações químicas e microbiológicas. Elas têm cada vez mais desempenhando papel de destaque, contribuindo ativamente para a venda de um produto. Assim, as indústrias de embalagens têm procurado atender aos consumidores mais exigentes e juntamente aos centros de pesquisa e universidades, têm investido mais em estudos de novas tecnologias, a fim de prolongar as características de qualidade do alimento, conferir melhor aparência, maior proteção mecânica no embarque, transporte, desembarque e nos supermercados, oferecer embalagens mais compactas, que ocupem menos espaço na geladeira, com abertura e fechamento mais fáceis, e que utilizem materiais de fácil reciclagem ou decomposição no ambiente. Com o objetivo de atender às novas expectativas das indústrias de alimentos e dos consumidores, surgem as embalagens ativas e as embalagens inteligentes. As embalagens ativas são aquelas que interagem de alguma forma com o alimento, seja liberando substâncias conservantes ao longo da vida de prateleira do produto, ou “corrigindo” alguns problemas naturais do alimento, como sabor amargo por exemplo, em que algumas enzimas podem ser adicionadas ao material de embalagem, minimizando este problema e tornando o produto mais saboroso. Já as embalagens inteligentes indicam as modificações químicas às quais os alimentos estão passando, como mudanças de pH, por exemplo, indicando alterações na qualidade do produto.

  19. Factores determinantes en la gestion de recursos humanos en empresas de servicios que incorporan de manera sistematica nuevas tecnologias: un estudio de caso en la comunidad valenciana

    National Research Council Canada - National Science Library

    Dominguez Santiago, Mildred

    2008-01-01

    La incorporacion de nuevas tecnologias presupone la reduccion de los ciclos de vida de tecnologias ya existentes, y trae consigo transformaciones en los estilos de vida de las personas, las practicas...

  20. Mush Column Magma Chambers

    Science.gov (United States)

    Marsh, B. D.

    2002-12-01

    Magma chambers are a necessary concept in understanding the chemical and physical evolution of magma. The concept may well be similar to a transfer function in circuit or time series analysis. It does what needs to be done to transform source magma into eruptible magma. In gravity and geodetic interpretations the causative body is (usually of necessity) geometrically simple and of limited vertical extent; it is clearly difficult to `see' through the uppermost manifestation of the concentrated magma. The presence of plutons in the upper crust has reinforced the view that magma chambers are large pots of magma, but as in the physical representation of a transfer function, actual magma chambers are clearly distinct from virtual magma chambers. Two key features to understanding magmatic systems are that they are vertically integrated over large distances (e.g., 30-100 km), and that all local magmatic processes are controlled by solidification fronts. Heat transfer considerations show that any viable volcanic system must be supported by a vertically extensive plumbing system. Field and geophysical studies point to a common theme of an interconnected stack of sill-like structures extending to great depth. This is a magmatic Mush Column. The large-scale (10s of km) structure resembles the vertical structure inferred at large volcanic centers like Hawaii (e.g., Ryan et al.), and the fine scale (10s to 100s of m) structure is exemplified by ophiolites and deeply eroded sill complexes like the Ferrar dolerites of the McMurdo Dry Valleys, Antarctica. The local length scales of the sill reservoirs and interconnecting conduits produce a rich spectrum of crystallization environments with distinct solidification time scales. Extensive horizontal and vertical mushy walls provide conditions conducive to specific processes of differentiation from solidification front instability to sidewall porous flow and wall rock slumping. The size, strength, and time series of eruptive behavior

  1. NOVAS TECNOLOGIAS E FORMAÇÃO DE PROFESSORES DO CAMPO: PARCERIAS EM DEBATE

    OpenAIRE

    2013-01-01

    O presente artigo enfoca as mediações das Novas Tecnologias (NT) na formação de professores da modalidade Educação a Distância (EAD) na Universidade Federal do Espírito Santo. A investigação parte de questionamentos sobre as mediações das Novas Tecnologias na formação docente em escolas do campo. A pesquisa permite identificar novas tendências teórico-metodológicas, mediadas por espaços interativos produzidos a partir da introdução de novas tecnologias no processo de ensino na modalidade a di...

  2. Harmonia cromática em animações: a cor no contexto da tecnologia

    OpenAIRE

    Franck, Gláucia

    2015-01-01

    Esta dissertação busca demonstrar a influência recíproca entre a arte e a tecnologia para além do artefato com o uso da cor na obtenção da harmonia cromática e do reforço perceptivo visual e cultural. Procuramos evidenciar como a arte se apropria da tecnologia na obtenção da harmonia pelo uso da cor no processo criativo. A arte, ao ser mediada pela tecnologia, desafia o artista a opor-se ao determinismo tecnológico que impõe resultados pela estandardização do uso de seus aparatos, superando s...

  3. Violência e tecnologias de gênero: tempo e espaço nos jornais

    OpenAIRE

    Pereira,Pedro Paulo Gomes

    2009-01-01

    Este texto busca compreender uma tecnologia de gênero que constrói "homens" e "mulheres", o masculino e o feminino, nas páginas dos jornais, sublinhando, nos discursos jornalísticos sobre violência, a violência própria dos discursos - a violência dessa tecnologia.

  4. Violência e tecnologias de gênero: tempo e espaço nos jornais

    OpenAIRE

    Pereira,Pedro Paulo Gomes

    2009-01-01

    Este texto busca compreender uma tecnologia de gênero que constrói "homens" e "mulheres", o masculino e o feminino, nas páginas dos jornais, sublinhando, nos discursos jornalísticos sobre violência, a violência própria dos discursos - a violência dessa tecnologia.

  5. The ALICE time projection chamber

    CERN Multimedia

    Maximilien Brice

    2005-01-01

    This time projection chamber is part of the ALICE detector on the new LHC accelerator at CERN. Particles produced in collisions at the core of the detector will follow paths outward through the various sub-detector layers. If these particles carry a charge, they will ionise the gas contained within this chamber producing an electric signal as the ions drift in the chamber's electric field.

  6. Estilos de cuidar de enfermeiras na Terapia Intensiva mediados pela tecnologia

    OpenAIRE

    Rafael Celestino da Silva; Márcia de Assunção Ferreira; Thémistoklis Apostolidis

    2014-01-01

    Objetivou-se analisar as representações sociais de enfermeiras de terapia intensiva sobre as práticas de cuidado, face à tecnologia. Realizou-se entrevistas com vinte e uma enfermeiras de um centro de terapia intensiva, em hospital público do Rio de Janeiro. Aplicouse análise lexical, com uso do Alceste 2010. Os resultados se organizaram em duas categorias, cada qual com três classes lexicais. A primeira trouxe o sentido da tecnologia na terapia intensiva e ...

  7. TECNOLOGIA DIGITAL E AGÊNCIA: RESSIGNIFICANDO A TAREFA DA ESCRITA ESCOLAR

    Directory of Open Access Journals (Sweden)

    Júlio Araújo

    2014-12-01

    Full Text Available Os conceitos de agência, letramentos e relação com o saber iluminam a análise das relações que estudantes de uma escola situada em zona periférica de Fortaleza têm construído com a tarefa da escrita envolvendo as tecnologias digitais. Os resultados mostram que, pelo exercício da escrita de tirinhas em ferramentas digitais, como a Pixton, esses sujeitos se movimentam no ambiente estruturante da escola e nele tentam obter suas conquistas, tanto pessoais como coletivas, auxiliados pelos recursos que tais tecnologias oferecem.

  8. Os contratos de transferência de tecnologia e os limites à autonomia privada

    OpenAIRE

    Conselvan, Jussara Seixas; Universidade Estadual de Londrina; Ferraro, Valkíria Aparecida Lopes; Universidade Estadual de Londrina

    2009-01-01

    Uma característica distintiva dos Contratos de Transferência de Tecnologia é a intervenção estatal, cuja conseqüência é a limitaçãoda liberdade de contratar das partes. A partir de uma reflexão sobre a intervenção estatal, são apontados fundamentos para os limites impostos pelos Estados, em seu âmbito interno, e pela ordem internacional. Conceitua-se tecnologia e caracteriza-se a sua transferência, enunciando as modalidades e cláusulas dos contratos. Indica-se como é exercido o controle na fo...

  9. The Big European Bubble Chamber

    CERN Multimedia

    1977-01-01

    The 3.70 metre Big European Bubble Chamber (BEBC), dismantled on 9 August 1984. During operation it was one of the biggest detectors in the world, producing direct visual recordings of particle tracks. 6.3 million photos of interactions were taken with the chamber in the course of its existence.

  10. Development of Fission Chamber Assembly

    Institute of Scientific and Technical Information of China (English)

    YANGJinwei; ZHANGWei; SONGXianying; LIXu

    2003-01-01

    The fission chambers which are gas counters with fissile material inside chamber,provide essential information for plasma opcharacteristics. In conjunction with the neutron flux monitor system these provide time-resolved measurements of the global neutron source strength and fusion power from thermal nuclear fusion reactor as ITER for all plasma conditions for which neutrons are produced.

  11. Coating experiment with 1.6-m vacuum evaporation chamber

    Science.gov (United States)

    Kamata, Yukiko; Hayashi, Saeko S.; Noguchi, Takeshi; Kanzawa, Tomio; Sasaki, Goro; Torii, Yasuo; Yutani, Masami; Ishikawa, Tsuyoshi

    1998-08-01

    We have conducted a series of coating experiments using the newly installed 1.6 m evaporation chamber at the Advanced Technology Center (ATC) of the National Astronomical Observatory of Japan. The main task of this chamber is to re-aluminize the 1.6 m mirror of the Infrared Simulator at the ATC. The design concept of the 1.6 m chamber is basically the same with the 8.3 m coating facility for Subaru Telescope. Therefore, we could utilize this chamber to evaluate the fundamental performance of the larger chamber. The extensive coating experiments were done in the spring, autumn of 1996, and autumn of 1997. Reduction of the number of the filaments has lead to the increase in their size, which caused difficulty in the annealing process. Attempts are focused on securing the sufficient metal loads on the filaments. Then the filaments are fired to measure the spray pattern of a single filament exposure, or the uniformity pattern resulted from the full setup of filament arrays. Using small slide glasses, the important parameters of the resultant reflecting film that are the thickness, the uniformity of the thickness, and the spectroscopic reflectance are measured. The absolute value of the reflectivity is estimated to be around 91% immediately after opening the chamber. In order to cover a wide range of observing wavelengths for the Infrared Simulator, and eventually for the optical-IR Subaru Telescope, it is necessary to seek after a higher evaporation rate with these chambers.

  12. National Ignition Facility Target Chamber

    Energy Technology Data Exchange (ETDEWEB)

    Wavrik, R W; Cox, J R; Fleming, P J

    2000-10-05

    On June 11, 1999 the Department of Energy dedicated the single largest piece of the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory (LLNL) in Livermore, California. The ten (10) meter diameter aluminum target high vacuum chamber will serve as the working end of the largest laser in the world. The output of 192 laser beams will converge at the precise center of the chamber. The laser beams will enter the chamber in two by two arrays to illuminate 10 millimeter long gold cylinders called hohlraums enclosing 2 millimeter capsule containing deuterium, tritium and isotopes of hydrogen. The two isotopes will fuse, thereby creating temperatures and pressures resembling those found only inside stars and in detonated nuclear weapons, but on a minute scale. The NIF Project will serve as an essential facility to insure safety and reliability of our nation's nuclear arsenal as well as demonstrating inertial fusion's contribution to creating electrical power. The paper will discuss the requirements that had to be addressed during the design, fabrication and testing of the target chamber. A team from Sandia National Laboratories (SNL) and LLNL with input from industry performed the configuration and basic design of the target chamber. The method of fabrication and construction of the aluminum target chamber was devised by Pitt-Des Moines, Inc. (PDM). PDM also participated in the design of the chamber in areas such as the Target Chamber Realignment and Adjustment System, which would allow realignment of the sphere laser beams in the event of earth settlement or movement from a seismic event. During the fabrication of the target chamber the sphericity tolerances had to be addressed for the individual plates. Procedures were developed for forming, edge preparation and welding of individual plates. Construction plans were developed to allow the field construction of the target chamber to occur parallel to other NIF construction activities. This

  13. Calibração de câmara semiaberta estática para quantificação de amônia volatilizada do solo Calibration of a semi-opened static chamber for the quantification of volatilized ammonia from soil

    Directory of Open Access Journals (Sweden)

    Ednaldo da Silva Araújo

    2009-07-01

    Full Text Available O objetivo deste trabalho foi calibrar uma câmara prática e de baixo custo, para quantificar a amônia volatilizada do solo. A calibração da câmara foi realizada pela técnica do balanço do isótopo 15N. A amônia volatilizada foi capturada por uma câmara semiaberta livre estática (SALE, confeccionada a partir de garrafa de plástico transparente de politereftalato de etileno (PET de 2 L. O interior da câmara apresentava livre circulação de ar, e possuía uma lâmina de espuma de poliuretano, com 2,5 cm de largura e 25 cm de comprimento, pendurada verticalmente, com a extremidade inferior inserida em frasco com solução ácida, que mantinha a espuma saturada. A recuperação do 15N-NH3 no coletor aumentou de forma linear com o aumento da taxa de volatilização de NH3 do solo. Os testes de campo mostraram eficiência de 57% na recuperação do N-NH3 volatilizado do solo. O intervalo de coletas das espumas pode variar de um a seis dias, sem comprometer a eficiência do sistema. Para estudos de campo, com uso do método proposto, o fator de correção de 1,74 deve ser usado para estimar a real taxa de volatilização de amônia do solo.The objective of this work was to calibrate a practical and low-cost chamber for the quantification of ammonia volatilization from soil. The chamber was calibrated using the 15N isotope balance technique. The volatilized ammonia was captured by a semi-opened free static chamber built with a 2 L ethylene polyterephthalate (PET plastic bottle. The inner side of the chamber had free-air circulation and a stripe of polyurethane foam, with 2.5 cm wide and 25 cm long, hanged vertically with the lower end inserted in a bottle containing acid solution, which kept the foam moistened. The recovery of 15N-ammonia by the chamber increased linearly with the increase in the rate of soil ammonia volatilization. Field tests showed an efficiency of 57% in the volatilized ammonia recuperation. The sampling interval of

  14. Ducted combustion chamber for direct injection engines and method

    Science.gov (United States)

    Mueller, Charles

    2015-03-03

    An internal combustion engine includes an engine block having a cylinder bore and a cylinder head having a flame deck surface disposed at one end of the cylinder bore. A piston connected to a rotatable crankshaft and configured to reciprocate within the cylinder bore has a piston crown portion facing the flame deck surface such that a combustion chamber is defined within the cylinder bore and between the piston crown and the flame deck surface. A fuel injector having a nozzle tip disposed in fluid communication with the combustion chamber has at least one nozzle opening configured to inject a fuel jet into the combustion chamber along a fuel jet centerline. At least one duct defined in the combustion chamber between the piston crown and the flame deck surface has a generally rectangular cross section and extends in a radial direction relative to the cylinder bore substantially along the fuel jet centerline.

  15. The CLEO III drift chamber

    CERN Document Server

    Peterson, D; Briere, R A; Chen, G; Cronin-Hennessy, D; Csorna, S; Dickson, M; Dombrowski, S V; Ecklund, K M; Lyon, A; Marka, S; Meyer, T O; Patterson, J R; Sadoff, A; Thies, P; Thorndike, E H; Urner, D

    2002-01-01

    The CLEO group at the Cornell Electron Storage Ring has constructed and commissioned a new central drift chamber. With 9796 cells arranged in 47 layers ranging in radius from 13.2 to 79 cm, the new drift chamber has a smaller outer radius and fewer wires than the drift chamber it replaces, but allows the CLEO tracking system to have improved momentum resolution. Reduced scattering material in the chamber gas and in the inner skin separating the drift chamber from the silicon vertex detector provides a reduction of the multiple scattering component of the momentum resolution and an extension of the usable measurement length into the silicon. Momentum resolution is further improved through quality control in wire positioning and symmetry of the electric fields in the drift cells which have provided a reduction in the spatial resolution to 88 mu m (averaged over the full drift range).

  16. Ion chamber based neutron detectors

    Science.gov (United States)

    Derzon, Mark S; Galambos, Paul C; Renzi, Ronald F

    2014-12-16

    A neutron detector with monolithically integrated readout circuitry, including: a bonded semiconductor die; an ion chamber formed in the bonded semiconductor die; a first electrode and a second electrode formed in the ion chamber; a neutron absorbing material filling the ion chamber; and the readout circuitry which is electrically coupled to the first and second electrodes. The bonded semiconductor die includes an etched semiconductor substrate bonded to an active semiconductor substrate. The readout circuitry is formed in a portion of the active semiconductor substrate. The ion chamber has a substantially planar first surface on which the first electrode is formed and a substantially planar second surface, parallel to the first surface, on which the second electrode is formed. The distance between the first electrode and the second electrode may be equal to or less than the 50% attenuation length for neutrons in the neutron absorbing material filling the ion chamber.

  17. Estilos de cuidar de enfermeiras na Terapia Intensiva mediados pela tecnologia

    Directory of Open Access Journals (Sweden)

    Rafael Celestino da Silva

    2014-04-01

    Full Text Available Objetivou-se analisar as representações sociais de enfermeiras de terapia intensiva sobre as práticas de cuidado, face à tecnologia. Realizou-se entrevistas com vinte e uma enfermeiras de um centro de terapia intensiva, em hospital público do Rio de Janeiro. Aplicouse análise lexical, com uso do Alceste 2010. Os resultados se organizaram em duas categorias, cada qual com três classes lexicais. A primeira trouxe o sentido da tecnologia na terapia intensiva e a organização dos estilos de cuidar; a segunda mostrou a condição do cliente e suas repercussões na prática de cuidar das enfermeiras. Concluiu-se que a tecnologia organiza os estilos de cuidar das enfermeiras, que se constroem na assistência ao cliente no contexto do trabalho. Estes conduzem as enfermeiras a atribuírem sentidos às suas práticas, levando-os a elaboração de modos de atuar em face das tecnologias.

  18. Metacognição e tecnologia educacional simbólica

    Directory of Open Access Journals (Sweden)

    Maurício de Abreu Pinto Peixoto

    Full Text Available As Diretrizes Curriculares Nacionais do Curso de Graduação em Medicina enumeram, entre os objetivos do currículo de graduação, aprender a aprender e ter competência e habilidade para avaliar, sistematizar e decidir as condutas mais adequadas com base em evidências científicas, bem como habilidades de escrita e leitura. Sob o viés particular do auxílio ao ensino e à aprendizagem, propomos que a metacognição seja entendida como uma tecnologia educacional simbólica. Para isto, fizemos uso da Fenomenologia de Schultz, em suas reflexões sobre o uso de símbolos, como o arcabouço lógico a unir os campos da tecnologia educacional e a metacognição. Este texto se organiza em quatro tópicos principais: o primeiro introduz o conceito de tecnologia educacional simbólica; o segundo, o conceito de metacognição; o terceiro procura unir os dois primeiros ao discutir o conceito e o papel dos símbolos na perspectiva fenomenológica; o quarto, mais operacional, exemplifica como a metacognição faz uso de símbolos e cifras para gerenciar o processo de aprendizagem, enquadrando-se, assim, no conceito de Tecnologia Educacional Simbólica.

  19. A tecnologia social como alternativa para a reorientação da economia

    Directory of Open Access Journals (Sweden)

    Sylvia Gemignani Garcia

    2014-12-01

    Full Text Available Este artigo, para expor a perspectiva da tecnologia social enquanto experimentação de formas alternativas de trocas econômicas e relações políticas, divide-se em duas seções. A primeira aborda a problemática moderna em torno da relação entre conhecimento científico e organização social, destacando, de um lado, as perspectivas críticas que investigam os condicionantes sociais e históricos dos padrões cognitivos dominantes e, de outro, as políticas científicas e tecnológicas que propõem e promovem a redefinição da atividade científica em termos de desempenho econômico. À luz desse cenário, a segunda seção situa a criação da Rede de Tecnologia Social no Brasil para discutir, a partir da definição de tecnologia social de Renato Dagnino, algumas dificuldades e certos limites das possibilidades cognitivas e políticas da concepção e da prática de uma "tecnologia social". A exposição enfatiza a natureza social dos obstáculos que se opõem a essas possibilidades alternativas.

  20. Determinantes da adoção da tecnologia de despolpamento na cafeicultura

    Directory of Open Access Journals (Sweden)

    Edson Zambon Monte

    2006-06-01

    Full Text Available Os cafeicultores de Venda Nova do Imigrante, ES, que em sua maioria são agricultores familiares, têm adotado novas tecnologias para melhorar a qualidade do café arábica produzido na região. O objetivo deste trabalho é identificar os fatores que determinam a adoção da tecnologia de despolpamento pelos cafeicultores do município. O modelo Logit é utilizado como instrumento metodológico. Observa-se, pelos resultados, que os aspectos relativos a associativismo, escolaridade, capital próprio, produtividade, rentabilidade e treinamento determinam a adoção da tecnologia de despolpamento. As variáveis que mais contribuem para a adoção da tecnologia de despolpamento são rentabilidade, associativismo e treinamento.The family farm coffee producers from Venda Nova do Imigrante, ES, have adopted the pulping technology to improve Arabic coffee quality. The objective of this paper is to identify the adoption determinants of the pulping technology by the coffee producers. The Logit model is applied for data analysis. The pulping technology adoption is determined by the variables: coop affiliation, years of school, own capital stock, yield, profitability and training. The variables with greater marginal impact on coffee pulping technology adoption are: profitability, coop affiliation and training.

  1. Development of a novel reaction chamber for ion beam analysis of large samples

    Energy Technology Data Exchange (ETDEWEB)

    Kakuee, O.R. [Van de Graaff Laboratory, Nuclear Science Research School, Nuclear Science and Technology Research Institute (NSTRI), 14395-836 Tehran (Iran, Islamic Republic of)], E-mail: okakuee@yahoo.com; Fathollahi, V.; Agha-Aligol, D.; Farmahini-Farahani, M.; Oliaiy, P.; Lamehi-Rachti, M. [Van de Graaff Laboratory, Nuclear Science Research School, Nuclear Science and Technology Research Institute (NSTRI), 14395-836 Tehran (Iran, Islamic Republic of)

    2008-04-15

    A novel vacuum chamber for ion beam analysis of large-size industrial samples - whose analysis are not feasible in conventional ion beam analysis reaction chambers - has been designed, fabricated and successfully tested. Using the newly developed chamber, both PIXE and RBS analyses could be carried out at the same time and on the same point of the samples. Ion beam analysis using this novel chamber lacks the disadvantages of external beam analysis and benefits the advantages of in-vacuum analysis. This has been achieved by designing a tiny open port in the wall of the reaction chamber to be sealed with a small flat area of sample body where its analysis is of interest. As a case study, two samples of gas turbine blades, a corroded one at highly corrosive environment and a refurbished one after application of certain coatings are analysed using the novel chamber. Experimental results confirm the performance and capability of the reaction chamber.

  2. NAS ENTRELINHAS DA APRENDIZAGEM: O ENSINO, A VIRTUALIDADE E OS DESAFIOS DAS TECNOLOGIAS NA ESCOLA

    Directory of Open Access Journals (Sweden)

    Wendel Souza Santos

    2015-03-01

    Full Text Available A pesquisa aborda a formação docente para o uso das novas tecnologias de comunicação em sua relação com o processo de ensino-aprendizagem. O objetivo foi investigar a formação inicial e continuada dos professores/as, suas práticas e experiências em relação ao uso de tecnologias educacionais de comunicação. Para o desenvolvimento do trabalho, foi proposta uma pesquisa de abordagem qualitativa, com objetivos exploratórios e descritivos através de um estudo de campo, realizado em uma escola da rede municipal de Ilhéus. Para isso, como recurso metodológico, utilizamos técnicas de coletas de dados: observação sistemática da escola e entrevistas semiestruturadas com os professores e gestores. Os resultados nos mostraram inúmeros desafios para que essas práticas se concretizem. Na escola, foram encontradas as seguintes tecnologias de comunicação: televisão, computador, notebook, máquina fotográfica digital, data show e som. Além disso, apesar de a escola pesquisada possuir alguns recursos tecnológicos disponíveis, ainda há a burocracia para se utilizar tais aparatos. Concluiu-se, portanto, que o não acesso e a inviabilização às ferramentas de tecnologia de comunicação por parte de professores e alunos são causas diretas de um problema mais amplo (associado às deficiências na formação de usuários destas tecnologias e que compromete a eficiência do processo de ensino-aprendizagem: o problema da exclusão digital.  

  3. Filosofia da tecnologia e Educação Física: tensões a partir do corpo

    OpenAIRE

    Fabio Zoboli; Elder Silva Correia; Felipe Quintão de Almeida

    2014-01-01

    http://dx.doi.org/10.5007/2175-8042.2014v26n43p287Artigo com o objetivo de apresentar e situar a Filosofia da Tecnologia como disciplina que aborda questões importantes aos estudos das intervenções do corpo em face à tecnologia ligada a estudos vinculados à Educação Física. A partir de uma busca em 05 periódicos do campo, visualizou-se 03 temas para análise: virtualização do corpo/movimento; doping; corpo acoplado à tecnologia. Como resultado, encontra textos que apresentam questões ligadas à...

  4. Numerical modeling of flow in a differential chamber of the gas-dynamic interface of a portable mass-spectrometer

    Science.gov (United States)

    Pivovarova, E. A.; Smirnovsky, A. A.; Schmidt, A. A.

    2013-11-01

    Mathematical modeling of flow in the differential chamber of the gas-dynamic interface of a portable mass-spectrometer was carried out to comprehensively study the flow structure and make recommendations for the optimization of the gas-dynamic interface. Modeling was performed using an OpenFOAM open computational platform. Conditions for an optimal operating mode of the differential chamber were determined.

  5. The multigap resistive plate chamber

    Energy Technology Data Exchange (ETDEWEB)

    Zeballos, E. Cerron [European Organization for Nuclear Research (CERN), Geneva (Switzerland); World Lab., Lausanne (Switzerland); Crotty, I. [European Organization for Nuclear Research (CERN), Geneva (Switzerland); Hatzifotiadou, D. [European Organization for Nuclear Research (CERN), Geneva (Switzerland); World Lab., Lausanne (Switzerland); Valverde, J. Lamas [European Organization for Nuclear Research (CERN), Geneva (Switzerland); World Lab., Lausanne (Switzerland); Univ. Louis Pasteur, Strasbourg (France); Neupane, S. [European Organization for Nuclear Research (CERN), Geneva (Switzerland); World Lab., Lausanne (Switzerland); Williams, M. C. S. [European Organization for Nuclear Research (CERN), Geneva (Switzerland); Zichichi, A. [Univ. of Bologna, Bologna (Italy)

    2015-02-03

    The paper describes the multigap resistive plate chamber (RPC). This is a variant of the wide gap RPC. However it has much improved time resolution, while keeping all the other advantages of the wide gap RPC design.

  6. The PHENIX Time Expansion Chamber

    Energy Technology Data Exchange (ETDEWEB)

    Rosati, M.; Barish, K.; Botelho, S.; Chang, W.C.; Gogoi, A.L. de; Dietzsch, O.; Ferdousi, T.; Franz, A.; Fung, S.Y.; Gannon, J.; Harder, J.; Kandasamy, A.; Khomutnikov, A.; Kotchekov, D.; Lebedev, A.; Li, X.H.; Mahon, J.; Munirassimann, M.; Negrin, J.; O' Brien, E.; O' Connor, P.; Pisani, R.; Rankowitz, S.; Seto, R.; Takagui, E.M.; Wang, H.Q

    1999-12-27

    The TEC/TRD subsystem will track all charged particles and contribute to the particle identification by the measurement of energy loss. The design, construction and testing of the TEC chambers are described.

  7. The PHENIX Time Expansion Chamber

    CERN Document Server

    Rosati, M; Botelho, S; Chang, W C; Gogoi, A L D; Dietzsch, O; Ferdousi, T; Franz, A; Fung, S Y; Gannon, J; Harder, J; Kandasamy, A; Khomutnikov, A; Kotchekov, D; Lebedev, A; Li, X H; Mahon, J; Munirassimann, M; Negrin, J; O'Brien, E; O'Connor, P; Pisani, R; Rankowitz, S; Seto, R; Takagui, E M; Wang, H Q

    1999-01-01

    The TEC/TRD subsystem will track all charged particles and contribute to the particle identification by the measurement of energy loss. The design, construction and testing of the TEC chambers are described.

  8. Vacuum chambers for LHC LSS

    CERN Document Server

    Costa-Pinto, P

    2004-01-01

    The approximately 6 km total length of the Large Hadron Collider (LHC) warm sections consist of about 1000 chambers. Most of these chambers, of various length and cross sections, are made of copper, but different lengths in stainless steel, mumetal, aluminium and beryllium will also be used. All the chambers will be internally coated with a thin film of TiZrV, to reduce both the secondary electron yield and the photon and electron stimulated desorption, with the further advantage of providing a huge additional pumping speed. In order to cope with the tight production schedule, a new dedicated coating facility was created, which allows four chambers to be coated per working day. This coating facility and its operating mode are described, together with the TiZrV film characteristics (structure, morphology) and performance (pumping speed, ultimate pressure, discharge gas outgassing).

  9. Vaporization chambers and associated methods

    Energy Technology Data Exchange (ETDEWEB)

    Turner, Terry D.; Wilding, Bruce M.; McKellar, Michael G.; Shunn, Lee P.

    2017-02-21

    A vaporization chamber may include at least one conduit and a shell. The at least one conduit may have an inlet at a first end, an outlet at a second end and a flow path therebetween. The shell may surround a portion of each conduit and define a chamber surrounding the portion of each conduit. Additionally, a plurality of discrete apertures may be positioned at longitudinal intervals in a wall of each conduit, each discrete aperture of the plurality of discrete apertures sized and configured to direct a jet of fluid into each conduit from the chamber. A liquid may be vaporized by directing a first fluid comprising a liquid into the inlet at the first end of each conduit, directing jets of a second fluid into each conduit from the chamber through discrete apertures in a wall of each conduit and transferring heat from the second fluid to the first fluid.

  10. BEBC Big European Bubble Chamber

    CERN Multimedia

    CERN PhotoLab

    1974-01-01

    A view of the dismantling of the magnet of BEBC, the 3.7 m European Bubble Chamber : iron magnetic shielding ; lower and upper parts of the vacuum enclosure of the magnet; turbo-molecular vacuum pumps for the "fish-eye" windows; the two superconducting coils; a handling platform; the two cryostats suspended from the bar of the travelling crane which has a 170 ton carrying capacity. The chamber proper, not dismantled, is inside the shielding.

  11. Anterior chamber depth during hemodialysis

    Directory of Open Access Journals (Sweden)

    Gracitelli CPB

    2013-08-01

    Full Text Available Carolina Pelegrini Barbosa Gracitelli,1 Francisco Rosa Stefanini,1 Fernando Penha,1 Miguel Ângelo Góes,2 Sérgio Antonio Draibe,2 Maria Eugênia Canziani,2 Augusto Paranhos Junior1 1Ophthalmology Department, 2Division of Nephrology, Federal University of São Paulo – UNIFESP, São Paulo, Brazil Background: Exacerbation of chronic glaucoma or acute glaucoma is occasionally observed in patients undergoing hemodialysis (HD because of anterior chamber depth changes during this therapy. Purpose: To evaluate anterior chamber depth and axial length in patients during HD sessions. Methods: A total of 67 eyes of 35 patients were prospectively enrolled. Axial length and anterior chamber depth were measured using ultrasonic biometry, and these measures were evaluated at three different times during HD sessions. Body weight and blood pressure pre- and post-HD were also measured. Results: There was no difference in the axial length between the three measurements (P = 0.241. We observed a significantly decreased anterior chamber depth (P = 0.002 during HD sessions. Conclusion: Our results support the idea that there is a change in anterior chamber depth in HD sessions. Keywords: anterior chamber, hemodialysis, axial length, acute angle-closure glaucoma

  12. Tecnologias na formação de professores: o discurso do MEC

    Directory of Open Access Journals (Sweden)

    Barreto Raquel Goulart

    2003-01-01

    Full Text Available Como síntese da pesquisa Tecnologias da informação e da comunicação e educação a distância: o discurso do MEC, o presente artigo analisa o discurso das políticas de formação de professores em curso no Brasil. Está organizado em quatro seções. A primeira aborda os sentidos atribuídos às tecnologias na educação, na sua relação com os modos pelos quais as tecnologias da informação e da comunicação (TIC têm sido incorporadas aos processos educacionais. Para tanto, focaliza as perspectivas e propostas definidoras da recontextualização das TIC no discurso pedagógico. A segunda seção discute o conjunto das ressignificações que têm sustentado as políticas de formação de professores, com especial destaque para noções como a do ''divisor digital'', bem como para as relações entre o deslocamento do trabalho docente para atividade e tarefa, a proposta da formação baseada em competências e o uso intensivo de tecnologias. Em outras palavras, está centrada na relação entre as TIC e a educação a distância (EaD, nas suas múltiplas dimensões. A terceira seção explicita as reduções operadas na incorporação das tecnologias na educação, a partir da análise de discurso dos textos do MEC, cujo movimento principal tem sido o de priorizar a formação de professores à distância, em consonância com as recomendações dos organismos internacionais aos países em desenvolvimento. Finalmente, a quarta seção pontua as tendências atuais das políticas de formação de professores, retomando e remetendo às questões relativas aos sentidos das tecnologias e aos modos da sua apropriação educacional, em diferentes contextos.

  13. Particularidades en la mejora del proceso de gestion de las Tecnologias de la Informacion y las Comunicaciones

    National Research Council Canada - National Science Library

    Ruiz-Alvarez, Jennifer; Rodriguez-Gonzalez, Iraida; Baluja-Garcia, Walter; Diaz-Castro, Reinaldo; Dominguez-Hernandez, Aimet

    2013-01-01

    .... Por esta razon, las Tecnologias de la Informacion y las Comunicaciones (TICs) juegan un papel relevante en el desarrollo de cada empresa, para lo cual requieren mantenerse en una mejora continua con relacion a los estandares internacionales...

  14. Nuclear Design Considerations for Z-IFE Chambers

    Energy Technology Data Exchange (ETDEWEB)

    Meier, W R; Schmitt, R C; Abbott, R P; Latkowski, J F; Reyes, S

    2005-02-02

    Z-pinch driven IFE (Z-IFE) requires the design of a repetitive target insertion system that allows coupling of the pulsed power to the target with adequate standoff, and a chamber that can withstand blast and radiation effects from large yield targets. The present strategy for Z-IFE is to use high yield targets ({approx}2-3 GJ/shot), low repetition rate per chamber ({approx}0.1 Hz), and 10 chambers per power plant. In this study, we propose an alternative power plant configuration that uses very high yield targets (20 GJ/shot) in a single chamber operating at 0.1 Hz. A thick-liquid-wall chamber is proposed to absorb the target emission (x-rays, debris and neutrons) and mitigate the blast effects on the chamber wall. The target is attached to the end of a conical shaped Recyclable Transmission Line (RTL) made from a solid coolant (e.g., frozen flibe), or a material that is easily separable from the coolant (e.g., steel). The RTL/target assembly is inserted through a single opening at the top of the chamber for each shot. This study looks at the RTL material choice from a safety and environmental point of view. Materials were assessed according to waste disposal rating (WDR) and contact dose rate (CDR). Neutronics calculations, using the TART2002 Monte Carlo code from Lawrence Livermore National Laboratory (LLNL), were performed for the RTL and Z-IFE chamber, and key results reported here.

  15. Uso da tecnologia como ferramenta de avalia????o no cuidado cl??nico de rec??m-nascidos prematuros

    OpenAIRE

    2006-01-01

    Objetivo: Analisar a aplica????o do Neonatal Therapeutic Intervention Scoring System (NTISS) como um instrumento capaz de quantificar a utiliza????o de tecnologias nas pr??ticas assistenciais de unidades de terapia intensiva neonatal, no sentido de detectar varia????es nos cuidados ao rec??m-nascido de alto risco. M??todos: Foi realizado um estudo observacional prospectivo descritivo da intensidade de tecnologias em duas unidades de terapia intensiva neonatal, sendo uma p...

  16. Computational fluid dynamic (CFD) investigation of thermal uniformity in a thermal cycling based calibration chamber for MEMS

    Science.gov (United States)

    Gui, Xulong; Luo, Xiaobing; Wang, Xiaoping; Liu, Sheng

    2015-12-01

    Micro-electrical-mechanical system (MEMS) has become important for many industries such as automotive, home appliance, portable electronics, especially with the emergence of Internet of Things. Volume testing with temperature compensation has been essential in order to provide MEMS based sensors with repeatability, consistency, reliability, and durability, but low cost. Particularly, in the temperature calibration test, temperature uniformity of thermal cycling based calibration chamber becomes more important for obtaining precision sensors, as each sensor is different before the calibration. When sensor samples are loaded into the chamber, we usually open the door of the chamber, then place fixtures into chamber and mount the samples on the fixtures. These operations may affect temperature uniformity in the chamber. In order to study the influencing factors of sample-loading on the temperature uniformity in the chamber during calibration testing, numerical simulation work was conducted first. Temperature field and flow field were simulated in empty chamber, chamber with open door, chamber with samples, and chamber with fixtures, respectively. By simulation, it was found that opening chamber door, sample size and number of fixture layers all have effects on flow field and temperature field. By experimental validation, it was found that the measured temperature value was consistent with the simulated temperature value.

  17. SANMENXIA OPENS ARMS TO Investment Outside

    Institute of Scientific and Technical Information of China (English)

    Yan Manman

    2010-01-01

    @@ On March 10,Sanmenxia Economic Cooperation Projects Promotion Conference,sposored by Sanmenxia Government and sported by China Chamber of International Commerce (CCOIC)and China Tourism Association,was opened in Beijing.

  18. Plasma chemistry in wire chambers

    Energy Technology Data Exchange (ETDEWEB)

    Wise, J.

    1990-05-01

    The phenomenology of wire chamber aging is discussed and fundamentals of proportional counters are presented. Free-radical polymerization and plasma polymerization are discussed. The chemistry of wire aging is reviewed. Similarities between wire chamber plasma (>1 atm dc-discharge) and low-pressure rf-discharge plasmas, which have been more widely studied, are suggested. Construction and use of a system to allow study of the plasma reactions occurring in wire chambers is reported. A proportional tube irradiated by an {sup 55}Fe source is used as a model wire chamber. Condensable species in the proportional tube effluent are concentrated in a cryotrap and analyzed by gas chromatography/mass spectrometry. Several different wire chamber gases (methane, argon/methane, ethane, argon/ethane, propane, argon/isobutane) are tested and their reaction products qualitatively identified. For all gases tested except those containing methane, use of hygroscopic filters to remove trace water and oxygen contaminants from the gas resulted in an increase in the average molecular weight of the products, consistent with results from low-pressure rf-discharge plasmas. It is suggested that because water and oxygen inhibit polymer growth in the gas phase that they may also reduce polymer deposition in proportional tubes and therefore retard wire aging processes. Mechanistic implications of the plasma reactions of hydrocarbons with oxygen are suggested. Unresolved issues in this work and proposals for further study are discussed.

  19. Reflexões sobre o resgate do parto natural na era da tecnologia

    Directory of Open Access Journals (Sweden)

    Petronila Libana Cechin

    2002-08-01

    Full Text Available Este artigo tece algumas considerações reflexivas sobre o resgate do parto natural, apesar dos avanços tecnológicos na área obstétrica. Retomar as nossas raizes culturais para humanizar o processo da gestação e do parto, é uma proposta alternativa ao modelo atual. A interferência da tecnologia médica sobre o parto está associada ao poder econômico que se apossou do corpo, preconizando que o nascimento seguro é aquele que ocorre no meio hospitalar, munido de alta tecnologia. Assim sendo, criou-se a filosofia do parto medlcalizado, com rigorosa assepsia e atitudes técnicas, multas vezes desnecessárias, interferindo nesta maravilhosa conquista evolutiva que é o parto normal.

  20. M-Business: Negócios, Tecnologias e Estratégias

    Directory of Open Access Journals (Sweden)

    Luiz Claudio Gonçalves

    2013-12-01

    Full Text Available As tecnologias de comunicação sem fio (wireless, irreversivelmente estão surgindo nos atuais ambientes de negócios. Facilidades como ubiqüidade e amigabilidade no uso fazem a sua aceitação ser praticamente imediata para usuários, desenvolvedores e profissionais de modelagem de negócios. Essas tecnologias despontam como a solução operacional, econômica e estratégica do século XXI e, segundo as previsões dos institutos de pesquisa, o volume de negócios gerados epas mesmas serão sensivelmente expressivos. Desse modo, o presente artigo, por meio de uma pesquisa bibliográfica e um estudo de caso busca apresentar e avaliar os impactos do m-business nas operações das empresas modernas

  1. Tecnologias Móveis, Vida Cotidiana e Comunicação Instantânea

    Directory of Open Access Journals (Sweden)

    Lívia Assad de Moraes

    2015-03-01

    Full Text Available O artigo aborda a incorporação das tecnologias móveis à vida cotidiana, a partir dos novos aplicativos de conversação instantânea. Analisamos de que forma a os usos dessas tecnologias altera as relações com o território e a formação das identidades. As novas experiências de mobilidade permitem outras concepções de espaço, padrões culturais e formas de convívio, com características específicas, que complementam espaços tradicionais de sociabilidade e expressão simbólica.

  2. A tecnologia digital Blockchain: análise evolutiva e pragmática

    Directory of Open Access Journals (Sweden)

    Henrique Pereira de Araújo

    2017-06-01

    Full Text Available A sociedade observa o resultado de políticas intervencionistas extremas causadas pelos marcos regulatórios dos governos e convive com a necessidade urgente de alternativas aos serviços estatais. Portanto a população vive o melhor momento em ter acesso aos conhecimentos e reflexões em relação às tecnologias livres, que visam a evolução dentro do processo de mercado e com isso prover uma alternativa real, prática e consistente em relação aos serviços ineficientes, mitigando os problemas resultantes destes. Este artigo objetiva, por meio de pesquisa qualitativa realizada no primeiro semestre de 2016 e 2017 com 15 respondentes, mostrar os avanços da tecnologia Blockchain, a sua fundamentação econômica, e com isso testar a sua aceitabilidade.

  3. O Envolvimento de Fornecedores no Desenvolvimento da Tecnologia Flex Fuel nas Montadoras Brasileiras

    Directory of Open Access Journals (Sweden)

    Wilian Gatti Junior

    2011-05-01

    Full Text Available Normal 0 21 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} O desenvolvimento do veículo flex fuel no Brasil, capaz de operar com qualquer mistura de gasolina e álcool em uma faixa entre o E25 e o E100, alcançou enorme sucesso comercial. Esse sucesso é resultado de diversos fatores entre eles o Proálcool e a introdução da injeção eletrônica. A introdução dessa tecnologia no início de 2003 pelas montadoras brasileiras ilustra duas diferentes estratégias de envolvimento dos fornecedores no desenvolvimento da solução: o black box e o co-design. Este artigo apresenta dois estudos de casos em duas montadoras veteranas instaladas no Brasil desenvolveram a tecnologia flex fuel. O artigo discute a relação entre a plataforma tecnológica (sistema de gerenciamento de motores que inclui sensores, sistemas de controle, unidade de processamento de dados, etc. na qual a tecnologia flex fuel foi desenvolvida e as competências competitivas de ambas as montadoras e seus fornecedores.  O artigo então analisa as implicações do desenvolvimento da tecnologia flex fuel no Brasil e a dominância tecnológica sobre o sistema de controle eletrônico do motor e de software.

  4. O uso da tecnologia para a segurança do paciente

    Directory of Open Access Journals (Sweden)

    Silvia Helena de Bortoli Cassiani

    2009-06-01

    Full Text Available O processo de utilização de medicamentos é complexo, multidisciplinar e carregado de aspectos psicológicos, tornando os erros de medicação frequentes e com sérias consequências para os clientes e organizações hospitalares. Neste contexto, a qualidade do cuidado e a segurança dos pacientes assumem papel de relevância na literatura nacional e internacional, sendo reconhecida como a Era da Segurança. Como estratégias para a redução e prevenção dos erros de medicação, o investimento em tecnologias tem sido amplamente discutido. Desta maneira, o texto tem como objetivo discutir a importância do uso da tecnologia para a seguranca dos pacientes nos hospitais brasileiros, no que concerne à utilização dos medicamentos. Dentre estas tecnologias, discutimos a utilização da prescrição médica eletrônica, dos códigos de barra, da dispensação e distribuição de medicamentos por dose unitária e das bombas de infusão “inteligentes”. Investir em tecnologia para aprimorar os ambientes de trabalho e a segurança dos pacientes é uma questão que envolve negociação, considerando os custos advindos dos erros médicos e dos sistemas de medicação. Tais investimentos podem contribuir com o cuidado prestado ao paciente, diminuindo o tempo de internação, além de manter a força de trabalho qualificada e satisfeita.

  5. Tecnologias verdes para um mundo autossustentável: um olhar sobre Brasil e Espanha

    Directory of Open Access Journals (Sweden)

    Raimundo Nonato Macedo Santos

    2017-04-01

    Full Text Available O texto discute sobre as tecnologias verdes no âmbito do processo de inovação, com base na análise das patentes verdes solicitadas em nível global e, mais particularmente, no estudo das patentes de prioridade Brasil e Espanha. Patentes verdes aqui entendidas como patentes com foco em tecnologias verdes, ou seja, tecnologias adaptativas e mitigadores das mudanças do clima, o que compreende redução da emissão de carbono e poluição, aumento da eficiência energética e de recursos e a redução da perda de biodiversidade e dos ecossistemas. Do ponto de vista metodológico, formulou-se uma estratégia de busca com base nas tabelas Green Technology Manual Codes. Para a constituição do corpus de 224.673 registros de patentes extraídas da base de dados Derwent World Patents Index – período de cobertura 2004-2013 – o foco foram as tecnologias verdes estabelecidas pela Convenção Marco das Nações Unidas sobre a Mudança Climática. Os resultados do estudo demonstraram a amplitude da mobilização de esforços, ora sob a égide da economia verde, no propósito da mudança do modelo de produção tradicional, não como uma opção, mas como uma tendência imperativa da economia mundial.

  6. "Flat-Fish" Vacuum Chamber

    CERN Multimedia

    CERN PhotoLab

    1978-01-01

    The picture shows a "Flat-Fish" vacuum chamber being prepared in the ISR workshop for testing prior to installation in the Split Field Magnet (SFM) at intersection I4. The two shells of each part were hydroformed from 0.15 mm thick inconel 718 sheet (with end parts in inconel 600 for easier manual welding to the arms) and welded toghether with two strips which were attached by means of thin stainless steel sheets to the Split Field Magnet poles in order to take the vertical component of the atmospheric pressure force. This was the thinnest vacuum chamber ever made for the ISR. Inconel material was chosen for its high elastic modulus and strenght at chamber bake-out temperature. In this picture the thin sheets transferring the vertical component of the atmosferic pressure force are attached to a support frame for testing. See also 7712182, 7712179.

  7. The CLAS drift chamber system

    CERN Document Server

    Mestayer, M D; Asavapibhop, B; Barbosa, F J; Bonneau, P; Christo, S B; Dodge, G E; Dooling, T; Duncan, W S; Dytman, S A; Feuerbach, R; Gilfoyle, G P; Gyurjyan, V; Hicks, K H; Hicks, R S; Hyde-Wright, C E; Jacobs, G; Klein, A; Klein, F J; Kossov, M; Kuhn, S E; Magahiz, R A; Major, R W; Martin, C; McGuckin, T; McNabb, J; Miskimen, R A; Müller, J A; Niczyporuk, B B; O'Meara, J E; Qin, L M; Raue, B A; Robb, J; Roudot, F; Schumacher, R A; Tedeschi, D J; Thompson, R A; Tilles, D; Tuzel, W; Vansyoc, K; Vineyard, M F; Weinstein, L B; Wilkin, G R; Yegneswaran, A; Yun, J

    2000-01-01

    Experimental Hall B at Jefferson Laboratory houses the CEBAF Large Acceptance Spectrometer, the magnetic field of which is produced by a superconducting toroid. The six coils of this toroid divide the detector azimuthally into six sectors, each of which contains three large multi-layer drift chambers for tracking charged particles produced from a fixed target on the toroidal axis. Within the 18 drift chambers are a total of 35,148 individually instrumented hexagonal drift cells. The novel geometry of these chambers provides for good tracking resolution and efficiency, along with large acceptance. The design and construction challenges posed by these large-scale detectors are described, and detailed results are presented from in-beam measurements.

  8. COLDDIAG: A Cold Vacuum Chamber for Diagnostics

    CERN Document Server

    Casalbuoni, S; Gerstl, S; Grau, A W; Hagelstein, M; Saez de Jauregui, D; Boffo, C; Sikler, G; Baglin, V; Cox, M P; Schouten, J C; Cimino, R; Commisso, M; Spataro, B; Mostacci, A; Wallen, E J; Weigel, R; Clarke, J; Scott, D; Bradshaw, T; Jones, R; Shinton, I

    2011-01-01

    One of the still open issues for the development of superconducting insertion devices is the understanding of the beam heat load. With the aim of measuring the beam heat load to a cold bore and the hope to gain a deeper understanding in the beam heat load mechanisms, a cold vacuum chamber for diagnostics is under construction. The following diagnostics will be implemented: i) retarding field analyzers to measure the electron energy and flux, ii) temperature sensors to measure the total heat load, iii) pressure gauges, iv) and mass spectrometers to measure the gas content. The inner vacuum chamber will be removable in order to test different geometries and materials. This will allow the installation of the cryostat in different synchrotron light sources. COLDDIAG will be built to fit in a short straight section at ANKA. A first installation at the synchrotron light source Diamond is foreseen in June 2011. Here we describe the technical design report of this device and the planned measurements with beam.

  9. Tecnologias Sociais, Biopolíticas e Biopoder: Reflexões Críticas

    Directory of Open Access Journals (Sweden)

    Luciano Mendes

    Full Text Available Resumo:As tecnologias sociais (TS, como ações que visam a melhorar a qualidade de vida de grupos sociais diversos e que se encontram à margem do mercado ou do sistema econômico, têm por objetivo um novo modelo de desenvolvimento não predatório. Diante da ideia de melhoria da qualidade de vida, essas tecnologias acabam obtendo uma difusão sem limites, colaborando mais para a manutenção do sistema que para a solução definitiva dos problemas sociais. Tendo isso em vista, o objetivo principal deste ensaio teórico é discutir o quanto, muitas vezes, as TS acabam virando panaceia e instrumento das relações de poder, funcionando na justificação e intensificação de novas formas de dominação nas sociedades contemporâneas. Com o intuito de refletir sobre a difusão dessas tecnologias, inicialmente, surgiu a necessidade de aprofundar o entendimento sobre o que são as TS. Em seguida, o intuito foi explorar a visão de Michel Foucault sobre as biopolíticas e o biopoder, e entremear, nessa discussão, as TS.

  10. Análise comportamental por intermédio das tecnologias de Big Data

    Directory of Open Access Journals (Sweden)

    Daniel dos Santos Bernardo

    2016-02-01

    Full Text Available O mundo está cada vez mais interligado. Novas tecnologias vêm sendo criadas para conectar e diminuir a distância entre as pessoas. Com a ascensão das tecnologias há um crescimento exponencial na geração de dados variados, estruturados ou não. Analisar estes dados em busca de informações úteis para o negócio, visando ainda, a obtenção do comportamento de um grupo de indivíduos sobre uma questão em exame, é o que este artigo aborda. Isso a partir de demonstrações e descrições das tecnologias de Big Data, explorando ainda, os conceitos fundamentais aplicados ao contexto atual e, ao final, apresenta de forma básica o emprego de algumas das principais técnicas da plataforma IBM® InfoSphere® BigInsights™, que engloba diversos recursos para o auxílio na busca por insights relevantes. Explorando as potencialidades do Big Data é possível obter em tempo hábil resultados de processamentos de diferentes tipos de dados, traçando perfis comportamentais e classificações de sentimentos sobre uma determinada marca, produto ou serviço, além de permitir a aproximação com o público alvo.

  11. Os domínios da Tecnologia Educacional no campo da Saúde

    Directory of Open Access Journals (Sweden)

    Grasiele Nespoli

    2013-12-01

    Full Text Available Este artigo apresenta os resultados de um estudo que investigou a formação discursiva da Tecnologia Educacional e sua relação com o contexto histórico, político e social da reforma sanitária brasileira, por meio de uma análise do acervo do Núcleo de Tecnologia Educacional para a Saúde da Universidade Federal do Rio de Janeiro. Com base em noções teóricas da arqueologia de Michel Foucault, foram selecionados e analisados documentos que permitem identificar enunciados e avaliar as continuidades e descontinuidades discursivas que marcam a formação de domínios de saber acerca da Tecnologia Educacional. Conclui-se que foram constituídos três domínios de saber - instrução programada, integração ensino-serviço e educação em saúde - que colocam em disputa diferentes enunciados e possibilitam a passagem de uma visão tecnicista para uma visão crítica comprometida com a construção do Sistema Único de Saúde.

  12. As opinioes dos brasileiros sobre ciencia e tecnologia: o paradoxo da relacao entre informacao e atitudes

    Directory of Open Access Journals (Sweden)

    Yurij Castelfranchi

    2013-11-01

    Full Text Available Em muitos debates sobre as relações entre ciência e sociedade, em particular quanto à aceitação das tecnologias ou à percepção de seus riscos, existe uma hipótese subjacente: a de que a ignorância gera medo, e o medo gera desconfiança ou hostilidade contra a ciência e a tecnologia. Neste artigo mostramos que essa hipótese é questionável. Com base numa recente enquete nacional, apontamos que atitudes otimistas sobre ciência e tecnologia não dependem do nível escolar ou da informação declarada ou acessada pelas pessoas sobre o tema. Indivíduos com escassa informação possuem, em geral, atitudes positivas. Pessoas com maior escolaridade e acesso à informação possuem atitudes diversificadas, otimistas sobre alguns aspectos, porém mais críticas sobre outros.

  13. Comunicação, Tecnologia e Subjetividade: Apontamentos Estratégicos

    Directory of Open Access Journals (Sweden)

    Wilton Garcia

    2009-02-01

    Full Text Available Este texto desenvolve uma reflexão crítica sobre comunicação e tecnologia enquanto produção de conhecimento e subjetividade, ao considerar os aspectos socioculturais e políticos. Como atribuir (redimensões de valores ideológicos aos tecnológicos? Nesse contexto, privilegia-se uma situação emergente acerca da implantação do Sistema Brasileiro de Televisão Digital (SBTVD. Corpo, experiência e imagem elencam-se como categorias críticas, as quais se inscrevem de modo diluído ao longo dessa pesquisa, a partir da linguagem – estratificada entre cultura e representação. Dos estudos culturais às novas tecnologias, evocam-se os estudos contemporâneos (do corpo, da cultura, da linguagem e das novas tecnologias. Assim, tais estudos (BHABHA, 1998; CANCLINI, 1998; COSTA, 2004; EAGLETON, 2005; GUMBRECHT, 1998; HALL, 2003; HUTCHEON, 2000; LÉVY, 1999; MATURANA, 1997; YÚDICE, 2004, estrategicamente, contextualizam uma abordagem teórico-metodológica para evidenciar noções de atualização e inovação. A metodologia, aqui, constitui-se a partir da descrição de objetos e respectivos contextos a serem investigados de modo multidisciplinar.

  14. Annular-Cross-Section CFE Chamber

    Science.gov (United States)

    Sharnez, Rizwan; Sammons, David W.

    1994-01-01

    Proposed continuous-flow-electrophoresis (CFE) chamber of annular cross section offers advantages over conventional CFE chamber, and wedge-cross-section chamber described in "Increasing Sensitivity in Continuous-Flow Electrophoresis" (MFS-26176). In comparison with wedge-shaped chamber, chamber of annular cross section virtually eliminates such wall effects as electro-osmosis and transverse gradients of velocity. Sensitivity enhanced by incorporating gradient maker and radial (collateral) flow.

  15. Ionization chambers for LET determination

    DEFF Research Database (Denmark)

    Kaiser, Franz-Joachim; Bassler, Niels; Tölli, Heikki

    2010-01-01

    resolution and high sensitivity are necessary. For exact dosimetry which is done using ionization chambers (ICs), the recombination taking place in the IC has to be known. Up to now, recombination is corrected phenomenologically and more practical approaches are currently used. Nevertheless, Jaff´e's theory...... of columnar recombination was designed to model the detector efficiency of an ionization chamber. Here, we have shown that despite the approximations and simplification made, the theory is correct for the LETs typically found in clinical radiotherapy employing particles from protons to carbon ions...

  16. Ionization Chamber Measures Extreme Ultraviolet

    Science.gov (United States)

    Carlson, Robert W.

    1987-01-01

    Ionization chamber operates in nearly total photon absorption as stable, self-calibrating detector of ionizing extreme ultraviolet radiation. Working gas of instrument is neon; photoionization properties well known and readily applicable to absolute measurements. Designed for measurements of solar ultraviolet flux aboard sounding rocket, instrument used on Earth to measure ultraviolet radiation in vacuum systems. Ionization chamber collects positive neon ions and electrons produced by irradiation of neon gas by ultraviolet photons. Approximately one ion produced by each photon; consequently, photoionization current nearly proportional to photon flux.

  17. DELPHI's Ring Imaging Cherenkov Chamber

    CERN Multimedia

    1989-01-01

    The hundreds of mirrors around this Ring Imaging Cherenkov Chamber reflect cones of light created by fast moving particles to a detector. The velocity of a particle can be measured by the size of the ring produced on the detector. DELPHI, which ran from 1989 to 2000 on the LEP accelerator, was primarily concerned with particle identification.

  18. A dual deformable reverberation chamber

    NARCIS (Netherlands)

    Leferink, Frank

    2010-01-01

    There is disclosed an arrangement for measuring the effectiveness of a shielding material against electromagnetic fields. The arrangement comprises a first and a second reverberation chamber sharing a common wall. The common wall is partly made of the shielding material. A first antenna is arranged

  19. Bubble chamber: colour enhanced tracks

    CERN Multimedia

    1998-01-01

    This artistically-enhanced image of real particle tracks was produced in the Big European Bubble Chamber (BEBC). Liquid hydrogen is used to create bubbles along the paths of the particles as a piston expands the medium. A magnetic field is produced in the detector causing the particles to travel in spirals, allowing charge and momentum to be measured.

  20. Testing an hydrogen streamer chamber

    CERN Multimedia

    1975-01-01

    A 2x10 cm gap streamer chamber, 35x55 cm2 in surface, was built and tested at CERN. Good tracks of cosmic rays were obtained up to atmospheric pressure, see F. Rohrbach et al, CERN-LAL (Orsay) Collaboration, Nucl. Instr. Methods 141 (1977) 229. Michel Cathenoz stand on the center.

  1. DESARROLLO DE UN PORTAL WEB CON TECNOLOGIA PHP/MYSQL

    OpenAIRE

    IBAÑEZ RAAD, FABRICIO CARLOS

    2015-01-01

    Este trabajo de final de grado consta en la implementación de la tecnología PHP y MySQL en un portal web desarrollado con con NetBeans IDE. La ventaja es que tanto PHP, MySQL y NetBeans son open source con lo cual se evita el sobrecoste de pagar licencias adicionales a la hora de crear una web. En este proyecto he implementado un CMS (sistema de gestión de contenidos) donde el usuario puede poner en su web los objetos que el desee a través de este CMS de una forma dinámica y rápida sin tener...

  2. Integrated inertial fusion energy chamber dynamics and response

    Energy Technology Data Exchange (ETDEWEB)

    Uddin, Hasib, E-mail: uddin3@illinois.edu [Department of Mechanical Science and Engineering, University of Illinois at Urbana–Champaign, Urbana, IL 61801 (United States); Kramer, Richard; Pantano, Carlos [Department of Mechanical Science and Engineering, University of Illinois at Urbana–Champaign, Urbana, IL 61801 (United States); Kramer, Kevin; Tang, Vincent [Lawrence Livermore National Laboratory, Livermore, CA 94550 (United States); Sacks, Ryan; Moses, Gregory [Fusion Technology Institute, University of Wisconsin Madison, Madison, WI 53706 (United States); Hunt, Ryan; DeMuth, James; Scott, Howard; Dunne, A. Mike [Lawrence Livermore National Laboratory, Livermore, CA 94550 (United States)

    2014-12-15

    Highlights: • LES with embedded geometry. • Repetitive IFE chamber state. • Sensitivity to blast modeling. - Abstract: This paper presents results of three-dimensional hydrodynamics simulations of the flow inside a model inertial fusion energy (IFE) fusion chamber. Turbulence modeling employing the large-eddy simulation approach is used to estimate the gas dynamics, state, and mixing after a sufficiently large number of target ignitions. The rich radiation-flow physics that takes place immediately after the lasers hit the hohlraum is modeled separately using a high-fidelity one-dimensional model, which provides reference conditions for the complex geometry three-dimensional turbulence simulations. The IFE geometry includes optical ports and recirculation openings as well as a duct to evacuate the debris produced after each energy deposition (as a model of a laser shot). Furthermore, a selected set of sensitivity studies are conducted to estimate the effect of uncertainty in radiative properties of the Xenon gas at the prevalent conditions in the chamber. The results provide guidance regarding the turbulence conditions in the chamber, which seem to have entered a decay state immediately before a new shot takes place. Computational estimates of the density variability within the chamber as well as pressure history at the approximate location of the laser optical ports is presented among other turbulence statistics.

  3. Hydrostatic Hyperbaric Chamber Ventilation System

    Science.gov (United States)

    Sarguisingh, Miriam J.

    2012-01-01

    The hydrostatic hyperbaric chamber (HHC) represents the merger of several technologies in development for NASA aerospace applications, harnessed to directly benefit global health. NASA has significant experience developing composite hyperbaric chambers for a variety of applications. NASA also has researched the application of water-filled vessels to increase tolerance of acceleration forces. The combination of these two applications has resulted in the hydrostatic chamber, which has been conceived as a safe, affordable means of making hyperbaric oxygen therapy (HBOT) available in the developing world for the treatment of a variety of medical conditions. Specifically, HBOT is highly-desired as a possibly curative treatment for Buruli Ulcer, an infectious condition that afflicts children in sub-Saharan Africa. HBOT is simply too expensive and too dangerous to implement in the developing world using standard equipment. The HHC technology changes the paradigm. The HHC differs from standard hyperbaric chambers in that the majority of its volume is filled with water which is pressurized by oxygen being supplied in the portion of the chamber containing the patient s head. This greatly reduces the amount of oxygen required to sustain a hyperbaric atmosphere, thereby making the system more safe and economical to operate. An effort was taken to develop an HHC system to apply HBOT to children that is simple and robust enough to support transport, assembly, maintenance and operation in developing countries. This paper details the concept for an HHC ventilation and pressurization system to provide controlled pressurization and adequate washout of carbon dioxide while the subject is enclosed in the confined space during the administration of the medical treatment. The concept took into consideration operational complexity, safety to the patient and operating personnel, and physiological considerations. The simple schematic, comprised of easily acquired commercial hardware

  4. Growing and Analyzing Biofilms in Flow Chambers

    DEFF Research Database (Denmark)

    Tolker-Nielsen, Tim; Sternberg, Claus

    2011-01-01

    This unit describes the setup of flow chamber systems for the study of microbial biofilms, and methods for the analysis of structural biofilm formation. Use of flow chambers allows direct microscopic investigation of biofilm formation. The biofilms in flow chambers develop under hydrodynamic...... conditions, and the environment can be carefully controlled and easily changed. The protocols in this unit include construction of the flow chamber and the bubble trap, assembly and sterilization of the flow chamber system, inoculation of the flow chambers, running of the system, image capture and analysis...

  5. Chamber dynamic research with pulsed power

    Energy Technology Data Exchange (ETDEWEB)

    PETERSON,ROBERT R.; OLSON,CRAIG L.; RENK,TIMOTHY J.; ROCHAU,GARY E.; SWEENEY,MARY ANN

    2000-05-15

    In Inertial Fusion Energy (IFE), Target Chamber Dynamics (TCD) is an integral part of the target chamber design and performance. TCD includes target output deposition of target x-rays, ions and neutrons in target chamber gases and structures, vaporization and melting of target chamber materials, radiation-hydrodynamics in target chamber vapors and gases, and chamber conditions at the time of target and beam injections. Pulsed power provides a unique environment for IFE-TCD validation experiments in two important ways: they do not require the very clean conditions which lasers need and they currently provide large x-ray and ion energies.

  6. Cosmic Rays Response of High-pressure Ionization Chamber

    Institute of Scientific and Technical Information of China (English)

    GAO; Fei; XIAO; Xue-fu; NI; Ning; ZHANG; Xi; HOU; Jin-bing; SONG; Ming-zhe; WANG; Hong-yu

    2013-01-01

    In order to study cosmic rays response characteristics of self-designed HPIC(high pressure ionization chamber),model JLZ-Ⅲ,the JLZ-Ⅲwas placed on a boat which is 3 meters much deeper and at least 1 kilometer away from land to measure air kerma rate in the open water in Miyun Reservoir(geomagnetic latitude 29°N,altitude 160 m),Beijing.The result was compared with the measurement

  7. Effectiveness of Bench Top Non-Vacuum Autoclaves on Dental Turbine Chamber Sterilization Effectiveness of Bench Top Non-Vacuum Autoclaves on Dental Turbine Chamber Sterilization

    Directory of Open Access Journals (Sweden)

    Taraneh Movahhed

    2013-06-01

    Full Text Available Introduction: Dental turbine chamber is a suitable reservoir for living microorganisms, so chamber sterilization is necessary for reducing cross contamination risk. On the other hand, in non-vacuum autoclaves, steam penetration into turbine chamber is doubtful, while they are still in use in dental clinics. In this study, performance of small non-vacuum autoclave in turbine chamber sterilization was evaluated. Methods: A total of 48 dental turbines were sterilized by large vacuum autoclaves. The turbin chamber cap was opened in aseptic enviroment and a strip contaminated with bacillus stearothermophilus endospores was placed into chamber and chamber cap was closed. Twelve dental turbines were loaded in each of four autoclaves (2 large pre-vacuum autoclaves, 2 bench top non-vacuum autoclaves and sterilization process preformed according to the manufacturer's instructions. After the sterilization cycle, the strips were transferred to culture medium and incubated at 56°C for 48 Hours. As control sample, a biologic indicator that had not been autoclaved was used for each group. Results: Being loaded in different autoclaves, All 48 turbines were sterilized properly and all the cultures were negative. The culture results of four control indicators which were not sterilized, were positive. Conclusion: There was no difference between performance of vacuum and non-vacuum autoclaves in dental turbine chamber sterilization. Both types performed sterilization properly.

  8. Promoted-Combustion Chamber with Induction Heating Coil

    Science.gov (United States)

    Richardson, Erin; Hagood, Richard; Lowery, Freida; Herald, Stephen

    2006-01-01

    An improved promoted-combustion system has been developed for studying the effects of elevated temperatures on the flammability of metals in pure oxygen. In prior promoted-combustion chambers, initial temperatures of metal specimens in experiments have been limited to the temperatures of gas supplies, usually near room temperature. Although limited elevated temperature promoted-combustion chambers have been developed using water-cooled induction coils for preheating specimens, these designs have been limited to low-pressure operation due to the hollow induction coil. In contrast, the improved promoted-combustion chamber can sustain a pressure up to 10 kpsi (69 MPa) and, through utilization of a solid induction coil, is capable of preheating a metal specimen up to its melting point [potentially in excess of 2,000 F (approximately equal to 1,100 C)]. Hence, the improved promoted combustion chamber makes a greater range of physical conditions and material properties accessible for experimentation. The chamber consists of a vertical cylindrical housing with an inner diameter of 8 in. (20.32 cm) and an inner height of 20.4 in. (51.81 cm). A threaded, sealing cover at one end of the housing can be unscrewed to gain access for installing a specimen. Inlet and outlet ports for gases are provided. Six openings arranged in a helical pattern in the chamber wall contain sealed sapphire windows for viewing an experiment in progress. The base of the chamber contains pressure-sealed electrical connectors for supplying power to the induction coil. The connectors feature a unique design that prevents induction heating of the housing and the pressure sealing surfaces; this is important because if such spurious induction heating were allowed to occur, chamber pressure could be lost. The induction coil is 10 in. (25.4 cm) long and is fitted with a specimen holder at its upper end. At its lower end, the induction coil is mounted on a ceramic base, which affords thermal insulation to

  9. A portable miniature anechoic chamber

    Science.gov (United States)

    Lorthioir, Jack; Gavin, Paul

    The portable miniature anechoic chamber (PMAC), a low-cost alternative to a full-size anechoic chamber, is presented. The PMAC is a miniature, enclosed, RF-tight microwave antenna range, which approximates the performance of an indoor range over the C through Ku (G through J)-band frequencies. The small footprint, four by six feet, allows for ease of movement by one person to a test site, indoors or outdoors. The PMAC can be used at I (intermediate)-level to support the operational readiness (OR) requirements of the U.S. Army, Navy or Air Force. In conjunction with the antenna test equipment (ATE), and under TPS control, it can be used for performance verification, fault detection and fault isolation. A typical application using the PMAC in this operating mode is described.

  10. Development of multiwire proportional chambers

    CERN Multimedia

    Charpak, G

    1969-01-01

    It has happened quite often in the history of science that theoreticians, confronted with some major difficulty, have successfully gone back thirty years to look at ideas that had then been thrown overboard. But it is rare that experimentalists go back thirty years to look again at equipment which had become out-dated. This is what Charpak and his colleagues did to emerge with the 'multiwire proportional chamber' which has several new features making it a very useful addition to the armoury of particle detectors. In the 1930s, ion-chambers, Geiger- Muller counters and proportional counters, were vital pieces of equipment in nuclear physics research. Other types of detectors have since largely replaced them but now the proportional counter, in new array, is making a comeback.

  11. MPS II drift chamber system

    Energy Technology Data Exchange (ETDEWEB)

    Platner, E.D.

    1982-01-01

    The MPS II detectors are narrow drift space chambers designed for high position resolution in a magnetic field and in a very high particle flux environment. Central to this implementation was the development of 3 multi-channel custom IC's and one multi-channel hybrid. The system is deadtimeless and requires no corrections on an anode-to-anode basis. Operational experience and relevance to ISABELLE detectors is discussed.

  12. A test chamber for experimental hydrogen fluoride exposure in humans.

    Science.gov (United States)

    Søstrand, P; Kongerud, J; Eduard, W; Nilsen, T; Skogland, M; Boe, J

    1997-07-01

    An inhalation chamber was built to perform experimental studies with hydrogen fluoride (HF), other gases, and particulate matter. The present study sought to describe a new gas delivery system and the distribution and concentration of HF gas in the chamber. The aluminum chamber has a volume of 19.2 m3 and a variable ventilation rate of about 1 to 10 air changes per hour. The negative pressure difference between the chamber and outside air can be regulated from 0 to 300 Pa. HF was fed at concentrations of up to 4000 mg/m3 directly into the ventilation duct feeding the chamber through openings with diameters as small as 50 microns, oriented opposite to the airflow. Gas flow was varied from about 0.1 dm3/min at a pressure of 4 atm. The dilution factor of HF concentration from cylinder to chamber was on the order of 10(3) to 10(4). The standard deviation (SD) of the HF concentrations at a fixed measurement point during a 1-hour test was typically 0.05 mg/m3 at a time-weighted average (TWA) concentration of 2.66 mg/m3. The SD of the TWA HF concentrations at six locations in the chamber was typically 0.05 mg/m3 and 0.29 mg/m3 at 0.61 and 3.46 mg/m3, respectively. Human exposure could be predicted from calculations based on ventilation data, gas flow, and observed ratio between calculated and measured concentrations. When the target exposure concentration was 1.5 mg/m3, the measured mean exposure concentration was typically 1.54 mg/m3 (range: 1.4-1.7 mg/m3, SD 0.09 mg/m3, n = 8). The chamber is well-suited for inhalation studies in humans. Chamber atmosphere was controlled and has proved to be stable and homogeneous, even in tests with HF, a highly reactive gas in the class of superacids.

  13. GBO RF Anechoic Chamber & Antenna Test Range

    Data.gov (United States)

    Federal Laboratory Consortium — A shielded anechoic chamber measuring 15 by 15 by 37 feet is located in the Jansky Laboratory at Green Bank. This chamber has been outfitted as a far-field antenna...

  14. Dosimetric evaluation of newly developed well-type ionization chamber for use in the calibration of brachytherapy sources

    Directory of Open Access Journals (Sweden)

    Sathiyan Saminathan

    2016-01-01

    Full Text Available The well-type ionization chamber has been designed for convenient use in brachytherapy source strength calibration. The chamber has a volume of 240 cm 3 , weight of 2.5 kg, and is open to atmospheric conditions. The well-type ionization chamber dosimetric characteristics such as leakage current, stability, scattering effect, ion collection efficiency, and nominal response with energy were studied. The evaluated dosimetric characteristics of well-type ionization chamber were compared with two other commercially available well-type ionization chambers. The study shows that the newly developed well-type ionization chamber is reliable for air-kerma strength calibration. The results obtained confirm that this chamber can be used for the calibrations of high-dose rate brachytherapy sources.

  15. Dosimetric evaluation of newly developed well-type ionization chamber for use in the calibration of brachytherapy sources.

    Science.gov (United States)

    Saminathan, Sathiyan; Godson, Henry Finlay; Ponmalar, Retna; Manickam, Ravikumar; Mazarello, James

    2016-01-01

    The well-type ionization chamber has been designed for convenient use in brachytherapy source strength calibration. The chamber has a volume of 240 cm(3), weight of 2.5 kg, and is open to atmospheric conditions. The well-type ionization chamber dosimetric characteristics such as leakage current, stability, scattering effect, ion collection efficiency, and nominal response with energy were studied. The evaluated dosimetric characteristics of well-type ionization chamber were compared with two other commercially available well-type ionization chambers. The study shows that the newly developed well-type ionization chamber is reliable for air-kerma strength calibration. The results obtained confirm that this chamber can be used for the calibrations of high-dose rate brachytherapy sources.

  16. Tecnologia e demanda por qualificação na indústria brasileira

    Directory of Open Access Journals (Sweden)

    Naércio Aquino Menezes-Filho

    2003-09-01

    Full Text Available O objetivo deste artigo é o de estabelecer conexões entre o recente aumento no uso relativo de trabalhadores qualificados (em comparação aos não qualificados e medidas de tecnologia na manufatura brasileira nas últimas duas décadas. Para tanto, utilizamos a intensidade de P&D como proxy para progresso técnico. Encontramos evidências de complementaridade entre tecnologia e trabalho qualificado, que parece mais intensa entre 1994 e 1997. Além disso, quando utilizamos a intensidade de P&D nos Estados Unidos como instrumento para a intensidade de P&D no Brasil, seu impacto sobre a qualificação aumenta substancialmente, o que nos fornece indícios de que a transferência de tecnologia é um dos fatores que explica o aumento do uso relativo de qualificação no Brasil.The main aim of this paper is to investigate the relationship between skill upgrading and measures of technology in Brazilian manufacturing for the last two decades. We use R&D intensity as a proxy for technological change. We find robust evidence of technology-skill complementarity, especially for the period between 1994 and 1997. Furthermore, when U.S. R&D intensity is used as an instrument for Brazilian R&D intensity, its impact on skill demand rises threefold. This provides us with evidence that technological transfer is impacting skill-upgrading in Brazil.

  17. Gestão da tecnologia: desafios para as pequenas e médias empresas

    Directory of Open Access Journals (Sweden)

    Jose Carlos Teixeira da Silva

    1999-06-01

    Full Text Available Este trabalho discute a gestão da tecnologia ern pequenas e medias empresas tradicionais da área de manufaturados. Ele analisa aspectos estratégicos e operacionais através de um modelo conceitual simplificado, com base em referências bibliográficas e pesquisa exploratória("survey". Foram detectados alguns aspectos importantes : limitada integração entre planejamento de tecnologia e de produto/mercado; vulnerabilidade tecnológica com relação a direitos de propriedade industrial; dificuldades financeiras para desenvolvimento, capacitação tecnológica limitada; e limitação de mudanças organizacionais de transição. Uma questão importante seria a construção de mecanismos externos de colaboração para essas empresas, com difusão de práticas da gestão da tecnologia e parceria para desenvolvimento de produtos.This paper discuss the technology management in traditional small and medium enterprises-SMEs of the manufacture sector. It analyses strategic and operational aspects through a simplified conceptual model, with support of bibliographical references and exploratory research(survey. It was detected aspects concerning technology management for those companies: limited integration among technology andproduct/market planning, tecnological vulnerability with respect to rights properties, financial difficulties for development, limited technological capability, and limited organizational transition changes. A important question would be how to construct external mechanisms of collaboration to those emterprises, with appropriate diffusion of practices in technology management and partnerships in integrated product development.

  18. Interface empresa-universidade e a gestão da tecnologia

    Directory of Open Access Journals (Sweden)

    José Carlos Teixeira da Silva

    2001-06-01

    Full Text Available Este trabalho discute a interface empresa - universidade e a gestão da tecnologia em pequenas e médias empresas tradicionais do setor de manufaturados, com base em modelo conceitual simplificado e em pesquisa de campo, dentro do contexto atual de globalização do mercado. Constatou-se a importância da existência de um modelo de relação interorganizacional, que colabore na otimização dos resultados das pesquisas aplicadas na universidade e disponha de mecanismos de colaboração com aquelas empresas, visando à prática e difusão da gestão da tecnologia e parceria no desenvolvimento de produtos. Com base no modelo proposto em Silva(1999, através do COD - Centro Operacional de Desenvolvimento, o trabalho analisa vários aspectos da interface empresa - universidade e da gestão da tecnologia em empresas.This paper discusses the interface enterprise-university and the manufacturing traditional small and medium enterprises. It attempts to analyze, through a simplified conceptual model and field research, the research in the university and the technology management in those industries, at the context of globalization. It was detected the importance to improve a inter-organizational model to optimize the researches in the university and the mechanisms of collaboration to those enterprises, with respect to the diffusion of practices in technology management and partnerships in integrated product development. It was proposed, based in Silva(1999, the DOC-Development Operational Center as an adequate management model to that industry-university interface.

  19. O “CORPO” DO JORNAL E O SUJEITO URBANO: JORNALISMO E NOVAS TECNOLOGIAS

    Directory of Open Access Journals (Sweden)

    Telma Domingues da Silva

    2012-01-01

    Full Text Available O presente trabalho é uma reflexão sobre o discurso jornalístico em um momento de mudança, a partir do advento da tecnologia digital. Essa tecnologia age na identificação de jornalistas e leitores em relação a “o que é o jornal”. A análise da enunciação em torno desse momento no meio jornalístico aponta para um jornal que acaba e um jornal que fica: ou seja, a designação jornal mantém-se em referência a um conjunto determinado de textos em que se destacam as “notícias”, embora a materialidade digital faça (desse objeto (um outro. A análise dessa enunciação e do acontecimento da tecnologia digital na prática jornalística se faz através da metodologia da análise de discurso, com os conceitos de formações imaginárias e interdiscurso, de Pêcheux (1988, bem como da distinção proposta por Orlandi (2001 entre constituição, formulação e circulação do discurso. Verificou-se, com esta análise, que na transferência do sentido de jornal para a materialidade digital funciona a produção de uma identidade corporativa – mais exatamente, o reforço da identidade corporativa que já funciona – sobre esse corpo enquanto imagem (imaginário, que se marca graficamente.

  20. As tecnologias da informação e a exclusão digital

    Directory of Open Access Journals (Sweden)

    Clarinda Rodrigues Lucas

    Full Text Available As tecnologias da informação e a nova economia baseada no conhecimento provocam debates concernentes às dimensões sociais, políticas e culturais conseqüentes ao seu uso, consolidadas no termo exclusão digital, que tem aparecido com freqüência na mídia, na Internet e em alguns artigos da área da Ciência da Informação, referindo-se ao não uso destes recursos tecnológicos. Por exclusão digital ou infoexclusão, entende-se a diferença socioeconômica entre indivíduos, famílias, empresas e regiões geográficas, decorrentes da desigualdade quanto ao acesso e uso das tecnologias da informação, representada pela Internet. No âmbito das bibliotecas, consideradas instituições sociais que podem ter um sentido de comunidade, isto é, um espaço de conexão entre recursos de informação com as comunidades que as utilizam, o objetivo de inclusão social estaria concretizado em políticas de informação para a cidadania, em oposição à exclusão socioeconômica. Neste texto são analisados os aspectos ligados às questões relativas ao uso e às políticas que cercam a tecnologia da informação e lhe atribuem conteúdo.

  1. 21 CFR 868.5470 - Hyperbaric chamber.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 8 2010-04-01 2010-04-01 false Hyperbaric chamber. 868.5470 Section 868.5470 Food... DEVICES ANESTHESIOLOGY DEVICES Therapeutic Devices § 868.5470 Hyperbaric chamber. (a) Identification. A hyperbaric chamber is a device that is intended to increase the environmental oxygen pressure to promote...

  2. Growing and analyzing biofilms in flow chambers

    DEFF Research Database (Denmark)

    Tolker-Nielsen, Tim; Sternberg, Claus

    2011-01-01

    This unit describes the setup of flow chamber systems for the study of microbial biofilms, and methods for the analysis of structural biofilm formation. Use of flow chambers allows direct microscopic investigation of biofilm formation. The biofilms in flow chambers develop under hydrodynamic cond...

  3. Growing and Analyzing Biofilms in Flow Chambers

    DEFF Research Database (Denmark)

    Tolker-Nielsen, Tim; Sternberg, Claus

    2011-01-01

    This unit describes the setup of flow chamber systems for the study of microbial biofilms, and methods for the analysis of structural biofilm formation. Use of flow chambers allows direct microscopic investigation of biofilm formation. The biofilms in flow chambers develop under hydrodynamic cond...

  4. Wire chamber degradation at the Argonne ZGS

    Energy Technology Data Exchange (ETDEWEB)

    Haberichter, W.; Spinka, H.

    1986-01-01

    Experience with multiwire proportional chambers at high rates at the Argonne Zero Gradient Synchrotron is described. A buildup of silicon on the sense wires was observed where the beam passed through the chamber. Analysis of the chamber gas indicated that the density of silicon was probably less than 10 ppM.

  5. LEP vacuum chamber cross-section

    CERN Multimedia

    1987-01-01

    This diagram shows the layout of the vacuum chambers used at LEP, which was in operation at CERN between 1989 and 2000. Vacuum chambers are necessary in accelerators to prevent unwanted interactions that can destabilise the beam. The pump on the right sucks air out of the chamber allowing the beam to progress with minimal interactions.

  6. Simple Cloud Chambers Using Gel Ice Packs

    Science.gov (United States)

    Kamata, Masahiro; Kubota, Miki

    2012-01-01

    Although cloud chambers are highly regarded as teaching aids for radiation education, school teachers have difficulty in using cloud chambers because they have to prepare dry ice or liquid nitrogen before the experiment. We developed a very simple and inexpensive cloud chamber that uses the contents of gel ice packs which can substitute for dry…

  7. Vacuum chamber at intersection I-6

    CERN Multimedia

    1971-01-01

    The vacuum chamber at intersection region I-6, one of these where experiments in colliding-beam physics will be taking place. The "wheels" prevent the thin wall (1.5 mm) of the chamber from collapsing. The chamber is equipped with heating tapes and its wrapped in thermal insulation. Residual gas pressure at this and other similar regions is around 10_11.

  8. Role of Optical Coherence Tomography in Assessing Anterior Chamber Angles

    Science.gov (United States)

    Kochupurakal, Reema Thomas; Jha, Kirti Nath; Rajalakshmi, A.R.; Nagarajan, Swathi; Ezhumalai, G.

    2016-01-01

    Introduction Gonioscopy is the gold standard in assessing anterior chamber angles. However, interobserver variations are common and there is a need for reliable objective method of assessment. Aim To compare the anterior chamber angle by gonioscopy and Spectral Domain Optical Coherence Tomography (SD-OCT) in individuals with shallow anterior chamber. Materials and Methods This comparative observational study was conducted in a rural tertiary multi-speciality teaching hospital. A total of 101 eyes of 54 patients with shallow anterior chamber on slit lamp evaluation were included. Anterior chamber angle was graded by gonioscopy using the shaffer grading system. Angles were also assessed by SD-OCT with Trabecular Iris Angle (TIA) and Angle Opening Distance (AOD). Chi-square test, sensitivity, specificity, positive and negative predictive value to find correlation between OCT parameters and gonioscopy grading. Results Females represented 72.7%. The mean age was 53.93 ±8.24 years and mean anterior chamber depth was 2.47 ± 0.152 mm. Shaffer grade ≤ 2 were identified in 95(94%) superior, 42(41.5%) inferior, 65(64.3%) nasal and 57(56.4%) temporal quadrants. Cut-off values of TIA ≤ 22° and AOD ≤ 290 μm were taken as narrow angles on SD-OCT. TIA of ≤ 22° were found in 88(92.6%) nasal and 87(87%) temporal angles. AOD of ≤ 290 μm was found in 73(76.8%) nasal and 83(83%) temporal quadrants. Sensitivity in detecting narrow angles was 90.7% and 82.2% for TIA and AOD, while specificity was 11.7% and 23.4%, respectively. Conclusion Individuals were found to have narrow angles more with SD-OCT. Sensitivity was high and specificity was low in detecting narrow angles compared to gonioscopy, making it an unreliable tool for screening. PMID:27190851

  9. Contributos para o desenho da história das tecnologias da saúde

    OpenAIRE

    Lobato, João

    2006-01-01

    A História, quando entendida como uma malha atravessada de factos e momentos, na procura incessante de explicações e de quadros de referência de identidade cultural, torna-se num desafio aliciante e mesmo numa aventura. Aventura, de facto, quando se depara, ainda, com uma ausência total de um modelo sistematizador que nos facilite a busca e a interpretação dos factos e dos momentos que possam desvendar a história das profissões das tecnologias da saúde, como hoje são designadas.

  10. Recuperação de água industrial utilizando tecnologia de membranas

    OpenAIRE

    Ribau Teixeira, Margarida; Rosa, Maria João

    1998-01-01

    São descritos resumidamente os fundamentos sobre membranas e processos de separação com membranas. As aplicações mais frequentes dos processos de separação com membranas no tratamento de água residual industrial são discutidos. O tratamento das águas industriais através da tecnologia de membranas permite a recuperação de produtos de elevado valor económico, para além de permitir a reutilização da água do processo.

  11. A disrupção pervasiva da tecnologia na privacidade e nos processos de aprendizagem

    Directory of Open Access Journals (Sweden)

    Patricia Zeni Marchiori

    2016-07-01

    Full Text Available A equipe editorial da AtoZ apresenta os artigos desta edição, nos quais os autores avaliam espaços de informação e de aprendizagem em distintas condições de uso intensivo de tecnologias. Os entrevistados ampliam discussões relativas às metodologias e resultados derivados de questionamento quanto à formação de profissionais da informação e os desafios para as instituições envolvidas.

  12. Tecnologias de ligação de espumas metálicas

    OpenAIRE

    Costa, António Paulo Santos da

    2009-01-01

    Dissertação apresentada à Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para obtenção do Grau de Mestre em Engenharia Mecânica As espumas metálicas são conhecidas desde os anos 70 mas nos últimos anos foram alvo de desenvolvimentos significativos na fase de produção. Com os novos desenvolvimentos foi possível obter espumas mais resistentes que permitem aplicações estruturais mais nobres. A ligação destas espumas constitui contudo uma limitação significativa a pote...

  13. Tecnologias na Web 2.0 : o empoderamento na educação aberta

    OpenAIRE

    Santarosa, Lucila Maria Costi; Conforto, Debora; Schneider, Fernanda Chagas

    2013-01-01

    Esse artigo problematiza a utilização de recursos educacionais abertos, na perspectiva da web 2.0, como tecnologias impulsionadoras de movimentos educativos formais e não formais. Por meio de experiências na formação de educadores em cursos de pós-graduação, discutimos o conceito de empoderamento e os princípios que estruturam a Educação Aberta, para referendar a importância de aproximar sujeitos em processo de formação de sistemas Web abertos instituindo e ampliando os tempos-espaços da apre...

  14. A mediação articulada com uso de tecnologias : o trabalho docente na diversidade

    OpenAIRE

    Alves, Silvana Souza Silva

    2016-01-01

    Esse estudo teve como objetivo geral analisar se a mediação articulada com uso de tecnologias pode contribuir na organização do trabalho pedagógico dos professores da sala regular e Atendimento Educacional Especializado - AEE para favorecer o ensino e a aprendizagem do Estudante com Necessidades Educacionais Específicas - ENEE, na perspectiva da educação para todos. É fato que temos avançado nas leis e discursos sobre a inclusão em detrimento das práticas pedagógicas que atendam as diferentes...

  15. Implicació econòmica de la tecnologia SIGFOX al port d’Istanbul

    OpenAIRE

    Coll Martínez, Álvaro

    2016-01-01

    A continuació, es parlarà sobre un treball realitzat durant la estada d'Erasmus a la ciutat d'Istanbul, Turquia. Aquest treball pretén estudiar com afectaria la introducció d'una nova tecnologia, SIGFOX, en aquesta ciutat, mirant tant punts de vista teòrics com pràctics (amb visites a 3 empreses a Istanbul). El principal objectiu és, veure si l'impacte és positiu o, en contra, negatiu, suposant que la ciutat encara no estaria preparada per la seva utilització. Els mètodes utili...

  16. Tecnologia i biblioteques: una mirada al passat per veure els reptes del futur

    OpenAIRE

    Abadal, Ernest; Anglada i de Ferrer, Lluís M.

    2010-01-01

    S’analitza l’evolució de la tecnologia utilitzada a les biblioteques en els darrers 30 anys i es fa una projecció sobre els canvis que poden esdevenir en els propers anys en l’entorn professional.   S’analitzen cinc grans àmbits: els programes de gestió de biblioteques (SIGB), les bases de dades i altres sistemes d’accés a la informació científica, les revistes científiques,els llibres, i la producció i difusió de continguts per part de les biblioteques. Finalment, es presenten unes conclusio...

  17. A influência das tecnologias em projectos de design editorial.

    OpenAIRE

    Oliveira, Sara Filipa Fraga Campos de

    2014-01-01

    Dissertação para obtenção do grau de Mestre em Design de Comunicação, apresentada na Universidade de Lisboa - Faculdade de Arquitetura. O design de comunicação procura constantemente inovar na forma de transmitir mensagens a um público, seguindo, para tal, processos variados para a concretização da comunicação em si. A expressão gráfica que a mensagem assume foi evoluindo ao longo dos tempos de forma directamente ligada às tecnologias aplicadas ao design de comunicação existentes em cada a...

  18. Recuperação de água industrial utilizando tecnologia de membranas

    OpenAIRE

    Ribau Teixeira, Margarida; Rosa, Maria João

    1998-01-01

    São descritos resumidamente os fundamentos sobre membranas e processos de separação com membranas. As aplicações mais frequentes dos processos de separação com membranas no tratamento de água residual industrial são discutidos. O tratamento das águas industriais através da tecnologia de membranas permite a recuperação de produtos de elevado valor económico, para além de permitir a reutilização da água do processo.

  19. Identificació d'animals mitjançant tecnologia NFC en Android

    OpenAIRE

    2016-01-01

    Aquest article descriu el procés de desenvolupament d'una aplicació en Android per identificar animals, que permeti als usuaris que interactuen amb els animals, fer el seu treball d'una manera més ràpida, simple, i econòmica comparat amb les altres tecnologies que hi han actualment al mercat. Per tant, el que es pretén, és utilitzar la tecnologia NFC per etiquetar i identificar un animal amb una etiqueta NFC en Android, i que cada cop que sigui necessari, es pugui llegir el contingut per tal ...

  20. LINGUAGEM, TECNOLOGIA, GÊNEROS TEXTUAIS E ENSINO: DEZ ANOS DE DIÁLOGO COM LUIZ ANTÔNIO MARCUSCHI

    Directory of Open Access Journals (Sweden)

    Ana Elisa Ribeiro*

    2010-12-01

    Full Text Available Este texto revisita quatro artigos e capítulos de livros da autoria do linguista Luiz Antônio Marcuschi. Os trabalhos focalizados foram publicados ao longo da última década e têm como tema as relações entre novas tecnologias, gêneros textuais, linguagem e ensino. Neste artigo, propusemo-nos reler os textos de Marcuschi e tecer uma reflexão cuidadosa sobre a importante contribuição do linguista da UFPE para os estudos em linguagem e tecnologia, especialmente aqueles inspirados na linguística do texto. Palavras-chave: Luiz Antônio Marcuschi; Linguística Textual; Gêneros Textuais Emergentes; Linguagem e Tecnologia.

  1. Influence of ozone and ethylenediurea (EDU) on physiological characters and foliar symptom of spinach (Spinacia oleracea L.) in open-top chambers%EDU对臭氧胁迫下菠菜急性伤害症状和光合特性的影响

    Institute of Scientific and Technical Information of China (English)

    姚芳芳; 王效科; 冯兆忠; 郑飞翔; 冯宗炜; 欧阳志云

    2007-01-01

    如何减轻近地层臭氧(O3)体积分数持续升高对作物的影响是污染生态学研究的热点之一.运用改进的开顶式气室(open-top chambers, OTCs)装置,对嘉兴尖叶、嘉兴圆叶和荷兰35三种菠菜(Spinacia oleracea L.)进行连续5 d,每天8 h的臭氧急性暴露处理,且在暴露前24 h喷施300 mg·L-1质量浓度抗氧化剂ethylenediurea(EDU),研究EDU对臭氧胁迫下菠菜急性伤害症状及光合特性的影响.结果表明:(1)菠菜暴露于高体积分数O3时,叶片出现失水干枯、坏死斑等急性伤害症状,光合色素含量、气体交换参数和光响应参数显著降低,且下降幅度和暴露体积分数呈正相关.(2)菠菜经EDU处理后,光合特性参数明显提高.对O3和EDU作双因子分析发现,随着臭氧体积分数升高,EDU对叶片气体交换参数的影响显著,而对其他参数的影响不明显.由此可见,尽管EDU的防护作用对高体积分数的O3胁迫是有限的,但喷施EDU仍能有效减轻O3对植物的伤害,这对缓解农田生态系统O3污染灾害有积极意义.

  2. ROBucket: A low cost operant chamber based on the Arduino microcontroller.

    Science.gov (United States)

    Devarakonda, Kavya; Nguyen, Katrina P; Kravitz, Alexxai V

    2016-06-01

    The operant conditioning chamber is a cornerstone of animal behavioral research. Operant boxes are used to assess learning and motivational behavior in animals, particularly for food and drug reinforcers. However, commercial operant chambers cost several thousands of dollars. We have constructed the Rodent Operant Bucket (ROBucket), an inexpensive and easily assembled open-source operant chamber based on the Arduino microcontroller platform, which can be used to train mice to respond for sucrose solution or other liquid reinforcers. The apparatus contains two nose pokes, a drinking well, and a solenoid-controlled liquid delivery system. ROBucket can run fixed ratio and progressive ratio training schedules, and can be programmed to run more complicated behavioral paradigms. Additional features such as motion sensing and video tracking can be added to the operant chamber through the array of widely available Arduino-compatible sensors. The design files and programming code are open source and available online for others to use.

  3. Reformulação programática da disciplina de Tecnologia Educativa da Universidade do Minho

    OpenAIRE

    Blanco, Elías; Silva, Bento Duarte da; Oliveira, Lia Raquel

    1999-01-01

    Citação bibliográfica: Blanco, Elias; SILVA, Bento & Oliveira, Lia (1999). Reformulação programática da disciplina de Tecnologia Educativa da Universidade do Minho. In Paulo Dias & Varela de Freitas (orgs.), Actas da Conferência Internacional Desafios’99. Braga: Centro de Competência da Universidade do Minho do Projecto Nónio, pp. 319-338. (ISBN: 972-98456-0-3). Esta comunicação apresenta uma proposta de reformulação programática da disciplina de Tecnologia Educativa leccionada desde o ano...

  4. Violência e tecnologias de gênero: tempo e espaço nos jornais

    OpenAIRE

    Pedro Paulo Gomes Pereira

    2009-01-01

    Este texto busca compreender uma tecnologia de gênero que constrói "homens" e "mulheres", o masculino e o feminino, nas páginas dos jornais, sublinhando, nos discursos jornalísticos sobre violência, a violência própria dos discursos - a violência dessa tecnologia.The present discussion aims at understanding a technology of gender that constructs "men" and "women", the masculine and the feminine, on the newspaper articles, underscoring, in the journalistic discourse on violence, the violence e...

  5. Experimental Study of a Cu-Mo Alloy Vapor Chamber

    Directory of Open Access Journals (Sweden)

    Obata Daniel H.S.

    2016-01-01

    Full Text Available In this research, the thermal behavior of a vapor chamber embedded in the base of a heat sink was experimentally analyzed considering the influence of the heat source position. The vapor chamber was produced by a copper and molybdenum alloy with length of 240 mm, width of 54 mm, thickness of 3 mm, and capillary structures composed by copper screen meshes. The working fluid used was de-ionized water. The pure aluminum heat sink was cooled by air forced convection and the evaporator vapor chamber was heated using an electrical resistor simulating integrated circuit power dissipation. The experimental tests were done in a suction type wind tunnel with open return for a heat load varying from 20 to 80 W, for an airflow velocity varying from 1 to 4 m/s, and for three different heat source positions. The experimental results showed that, independently of the heat source position, the considered vapor chamber worked successfully, maintaining low operating temperature.

  6. Loss of ions in cavity ionization chambers

    Energy Technology Data Exchange (ETDEWEB)

    Takata, N. [Ionizing Radiation Section, NMIJ/AIST, Tsukuba 305-8568 (Japan)]. E-mail: n.takata@aist.go.jp; Tran, N.T. [Institute for Nuclear Science and Technique, VAEC, Hanoi (Viet Nam); Kim, E. [Radiation Safety Section, NIRS, Inageku, Chiba-city 263-8555 (Japan); Marsoem, P. [P3KRBiN-BATAN, JL Cinere-Pasar Jum' at, Jakarta 12070 (Indonesia); Kurosawa, T. [Ionizing Radiation Section, NMIJ/AIST, Tsukuba 305-8568 (Japan); Koyama, Y. [Ionizing Radiation Section, NMIJ/AIST, Tsukuba 305-8568 (Japan)

    2005-12-01

    Ion losses due to initial recombination, volume recombination, and back diffusion were each determined by measurements and calculations for different size cylindrical ionization chambers and spherical ionization chambers. By measuring signal currents from these ionization chambers irradiated with {sup 60}Co gamma rays, two groups of ion losses were obtained. (Group 1) Ion loss due to initial recombination and diffusion, which changes proportionally to the inverse of the voltage applied to the ionization chambers; (and group 2) ion loss due to volume recombination, which changes proportionally to the inverse of the square of the applied voltage. The diffusion loss was obtained separately by computing electric field distributions in the ionization chambers. It was found that diffusion loss is larger than initial recombination loss for the cylindrical ionization chambers and vise versa for the spherical ionization chambers.

  7. Pupillary block glaucoma following implantation of a posterior chamber pseudophakos in the anterior chamber.

    Directory of Open Access Journals (Sweden)

    Mandal Anil

    2002-01-01

    Full Text Available Pupillary block glaucoma is a common complication of cataract surgery, especially following anterior chamber intraocular lens implantation. We report a case of pupillary block glaucoma with a posterior chamber IOL that was implanted in the anterior chamber following a complicated extracapsular cataract extraction. The case was successfully managed by explantation of the posterior chamber lens, anterior vitrectomy, peripheral iridectomy and secondary anterior chamber intraocular lens implantation. The intraocular pressure was controlled with a single topical antiglaucoma medication.

  8. Basic Aerodynamics of Combustion Chambers,

    Science.gov (United States)

    1981-05-20

    8217, tie imnrulse foree eyuilibr-um c’ the bomd’~ leye - is 173 pv-:irJ p~76vJbK 2sO) IL !-. = Zn pT -- a , bV T. z -,,r y.re C era 3oia * ~~I" onc art-=e...heat by combustion all have very large influences on the capabilities of a combustion chamber. A yellow- colored flame represents diffusion combustion in...the wakes of fuel droplets. Blue- colored flames represent gaseous combustion of evaporated vapors which have already left the fuel droplets. The

  9. Perspectivas filosóficas do uso da tecnologia no cuidado de enfermagem em terapia intensiva

    Directory of Open Access Journals (Sweden)

    Camila Rose G. Barcelos Schwonke

    2011-02-01

    Full Text Available O contexto de assistência à saúde vem sendo influenciado por mudanças produzidas no âmbito da tecnologia o que tem gerado diversas inquietações e indagações acerca dos benefícios, riscos e das relações construídas entre trabalhadores, doentes e a utilização de máquinas como instrumentos imprescindíveis ao cuidado. O objetivo deste artigo foi refletir sobre o uso da tecnologia no cuidado de enfermagem ao doente crítico em terapia intensiva. Espera-se com estas reflexões minimizar arestas que permeiam os ambientes tecnologizados como a terapia intensiva e as concepções de cuidado de enfermagem que neste campo da assistência em saúde envolve o uso de máquinas e equipamentos que oferecem suporte avançado de vida

  10. ALERTA DE TECNOLOGIAS NOVAS E EMERGENTES: O DESAFIO DE INFORMAR A SOCIEDADE

    Directory of Open Access Journals (Sweden)

    Pollyanna Teresa Cirilo Gomes

    2015-10-01

    Full Text Available O monitoramento do Horizonte Tecnológico (MHT é uma etapa específica da Avaliação de Tecnologias em Saúde. Este trabalho teve como objetivo construir um modelo de Alerta de MHT centrado na sociedade, nos gestores e nos profissionais de saúde, a fim de ser utilizado no âmbito do Ministério da Saúde. Para isso, foram pesquisados nos sítios eletrônicos das agências integrantes da EuroScan, informes e alertas de tecnologias em saúde novas e emergentes. A partir dessa busca, levou-se em consideração a relevância da informação, a rapidez na obtenção dos dados e a disponibilidade para a equipe elaboradora. Os Alertas de MHT poderão promover o acesso dos diferentes segmentos da sociedade a informações baseadas na melhor evidência científica disponível, e poderá auxiliar nos processos de tomada decisão em saúde.

  11. Tecnologia, modernidade e política Tecnology, modernity and politics

    Directory of Open Access Journals (Sweden)

    Hermínio Martins

    1997-08-01

    Full Text Available Com base na distinção entre teorias da tecnologia "prometéicas" (que proclamam os benefícios do progresso da razão científica e "fáusticas" (que duvidam disto o autor examina a questão das novas tecnologias no mundo atual, dado um quadro político em que as grandes propostas de intervenção global na natureza humana não têm mais lugar, mas a rede de intervenções pontuais levanta por outro lado o risco da "tirania das possibilidades tecnológicas".On the basis of a distinction between two kinds of theories of technology (one believing in the benefits of the progress of a scientific rationality and the other casting doubts on this the author examines the question of the new technologies in our days, given a political framework in which the grand proposals for transforming human nature are no longer feasible but the network of small actual interventions raises from another standpoint the risk of the "tirany of the technological possibilities".

  12. "QUEM ME SALVA DE TI?": REPRESENTAÇÕES DOCENTES SOBRE A TECNOLOGIA DIGITAL

    Directory of Open Access Journals (Sweden)

    Marcelo Prado Amaral Rosa

    Full Text Available O objetivo deste estudo foi investigar as representações dos docentes sobre a relação entre o ensino dos conteúdos programáticos da disciplina de química e as tecnologias digitais, com a finalidade de identificar aspectos que permeiam e/ou circundam as estratégias didático-pedagógicas. A pesquisa teve como sujeitos cinco docentes. O instrumento de coleta de dados foi a entrevista aberta. A análise dos dados foi baseada no método da análise textual discursiva. Do contexto emergiram duas categorias: i Aqui não tem condições; e ii Ajuda a ver o cotidiano. Foi possível constatar a existência de divergências com relação aos discursos e às práticas no que concerne à utilização das tecnologias digitais.

  13. A Gestão da Tecnologia para Competitividade Empresarial no Setor Industrial

    Directory of Open Access Journals (Sweden)

    Francisco Grabovski Neto

    2002-12-01

    Full Text Available O artigo tem por objetivo demonstrar a importância da gestão governamental da tecnologia para promover a competitividade empresarial no setor industrial; ou seja, baseando-se em um relato histórico da economia paranaense, pretende-se demonstrar como as políticas públicas podem incentivar os investimentos no setor tecnológico. Portanto, através da gestão tecnológica os agentes produtivos podem propiciar a satisfação das necessidades sociais de uma região, estimulando o processo de desenvolvimento econômico, social e tecnológico em um ambiente competitivo e globalizado. O artigo, por fim ressalta também a utilização da tecnologia como fator de atendimento as necessidades sociais, promovendo o desenvolvimento econômico através da utilização de modelos de sistema de inovação tecnológica capazes de estimular a competitividade empresarial, e propor alternativas para enfrentar a problemática da escassez de recursos financeiros para a gestão de projetos tecnológicos, visando a obtenção de um desenvolvimento econômico, social e tecnológico de uma região.

  14. Tecnologias, mobilidades e educação: entre encontros e (desencontros

    Directory of Open Access Journals (Sweden)

    Luciana Velloso

    2015-11-01

    Full Text Available Este artigo traz algumas reflexões sobre nossas relações humanas e a relação com a educação nesta sociedade “líquido-moderna” (BAUMAN, 2001, 2008, 2009, 2011, discutindo sobre o atual estágio de globalização em que nos encontramos, muito marcado pelo uso de diferentes tipos de tecnologias, sobretudo que se pautam pela ideia de mobilidade. Tais reflexões são muito marcadas por minhas vivências em sala de aula enquanto docente de turmas de graduação em Pedagogia, nas quais pude exibir e discutir o filme “Medianeras: Buenos Aires na era do amor virtual” (2011, que nos possibilitou pensar a fluidez de nossas relações contemporâneas e as implicações deste tipo de interação mais superficial, também se reflete em nossas práticas educacionais, dificultando a criação de vínculos entre docentes e discentes. Indago se muitas das vezes, a mesma tecnologia que poderia ser uma aliada, acaba se tornando a grande vilã nos processos de ensino e aprendizado, dependendo da forma como as utilizamos.

  15. Desulfuration technologies: past, present and future; Tecnologias de desulfuracion: pasado, presente y futuro

    Energy Technology Data Exchange (ETDEWEB)

    Rodas G, Arturo; Blass A, Georgina; Panama T, Luz A. [Instituto de Investigaciones Electricas, Cuernavaca, Morelos (Mexico)

    2003-07-01

    The interest for obtaining harmony between the electric power generation and the environment has derived into the design of numerous technologies for the control of the main emissions of atmospheric polluting agents, being some of them the sulfur oxides (SOx) that, at certain levels of concentration in the atmosphere, cause health damages and to the surrounding ecosystem. The present article shows an overview of the technologies for the disposal of sulfurated compounds in thermoelectric power stations and their application trends in the future systems of electric power generation. [Spanish] El interes por lograr una armonia entre la generacion de energia electrica y el medio ambiente, ha derivado en el diseno de numerosas tecnologias para el control de las principales emisiones de contaminantes atmosfericos, siendo algunos de ellos los oxidos de azufre (SOx) que, a ciertos niveles de concentracion en la atmosfera, ocasionan danos a la salud y al ecosistema circundante. El presente articulo muestra un panorama general de las tecnologias de eliminacion de compuestos sulfurados en centrales termoelectricas y sus tendencias de aplicacion en los futuros sistemas de generacion de energia electrica.

  16. O saber e a tecnologia: mitos de um centro de tratamento intensivo

    Directory of Open Access Journals (Sweden)

    Bastos Marisa Antonini Ribeiro

    2002-01-01

    Full Text Available O presente artigo apresenta os resultados de um estudo etnográfico que teve como objetivo descrever a cultura dos enfermeiros de um centro de tratamento intensivo. Acreditando que o CTI é uma subcultura do hospital e que os enfermeiros intensivistas compartilham de símbolos e significados que foram desenvolvidos através das interações sociais no contexto da Terapia Intensiva, fui buscar no interacionismo simbólico e na descrição etnográfica a fundamentação teórico-metodológica para o presente estudo. Para compreender o processo de interiorização dos universos simbólicos no CTI, busquei descrever os sistemas temáticos de significados subjacentes às atividades dos enfermeiros intensivistas, através da observação participante, da entrevista etnográfica e da análise documental. Dentre os elementos culturais descritos, foi identificado o mito do saber e da tecnologia. Concluí que os mitos da tecnologia e do saber foram socialmente estabelecidos como estratégia de sobrevivência no cotidiano da terapia intensiva, repleto de riscos e incertezas.

  17. As tecnologias touch: corpo, cognição e subjetividade

    Directory of Open Access Journals (Sweden)

    Nize Maria Campos Pellanda

    2014-06-01

    Full Text Available O artigo trata da preparação de um quadro teórico para suportar uma pesquisa empírica que usa as tecnologias touch com o objetivo de mobilizar cognitiva e afetivamente sujeitos portadores de patologias cognitivas, principalmente autismo. A estrutura epistemológica da pesquisa baseia-se na abordagem complexa defendendo a ideia da necessidade de articular dimensões do humano que foram cindidas pela modernidade. Assim, partindo do pressuposto da unidade mente-corpo de Espinosa, as autoras passam por estudos recentes das neurociências e chegam até os estudos da biologia de cunho cibernético de H. Atlan, H. Maturana e F. Varela (teorias da "Complexificação pelo ruído" e da "Biologia da cognição" para mostrar a relação de tato com o dispositivo técnico integrando as demais dimensões. O artigo resgata a tecnologia de seu "ressentimento" moderno para mostrar complexidade de um novo paradigma que vê no objeto técnico uma potencialização do humano.

  18. A Percepção é um Prisma: corpo, presença e tecnologias

    Directory of Open Access Journals (Sweden)

    Enrico Pitozzi

    2014-05-01

    Full Text Available Ao partir de uma perspectiva interdisciplinar acerca dos conceitos de corpo, percepção e tecnologias na cena contemporânea, este texto tentará definir a noção estética geral de bodyscape como uma extensão da percepção do performer. Por meio de um exame de algumas práticas chave da cena contemporânea, como as composições coreográficas de Myriam Gourfink, Isabelle Choinière e o projeto de assinatura do movimento de Martine Époque e Denis Poulin, analisa-se o impacto das tecnologias sobre a redefinição do processo da percepção do performer na composição do movimento e a mudança da noção de presença. Nesse sentido, tem-se uma série das modificações que também influenciam a percepção do espectador. Portanto, discute-se a noção de empatia e tenta-se descobrir como ela se aplica ao contexto de uma imagem digital do corpo.

  19. Tecnologias e o ensino na área da Saúde

    Directory of Open Access Journals (Sweden)

    Arquimedes Pessoni

    2015-12-01

    Full Text Available O artigo de revisão versa sobre a mudança de configuração dada em sala de aula e fora dela a partir da adoção de redes sociais digitais como possibilidade de relacionamento entre alunos e professores. Os trabalhos consultados revelam uma tendência à adoção de novas formas de ensino e aprendizagem a partir da inclusão de tecnologia mediando os públicos envolvidos. Ressaltando trabalhos de sucesso e outros não muito felizes em que novas ferramentas foram adotadas por professores, as considerações apontam para a necessidade de adaptação por parte dos docentes para uma nova realidade de mercado em que o cliente, entendido aqui como aluno, traz consigo uma nova forma de aprender, inserindo a tecnologia como ferramenta necessária para que o conteúdo seja assimilado mais facilmente.

  20. Tecnologia na terapia intensiva e suas influências nas ações do enfermeiro

    Directory of Open Access Journals (Sweden)

    Rafael Celestino da Silva

    2011-12-01

    Full Text Available Objetivou-se identificar as representações sociais de enfermeiros sobre a tecnologia aplicada em cuidados intensivos, e relacioná-las aos seus modos de agir no cuidado do paciente. Pesquisa qualitativa, cujo referencial teórico-metodológico foi o das representações sociais. Realizou-se entrevistas com 24 enfermeiros, observação sistemática e análise de conteúdo temática. Os resultados se organizaram em três categorias sobre o desconhecimento da linguagem tecnológica, estratégias de aproximação, seu domínio e sua aplicação. O saber/conhecimento necessário para o manuseio da tecnologia, e o tempo de experiência do seu manejo orientam as representações sociais dos enfermeiros, incidindo nas suas ações de cuidado. Conclui-se que a política de contratação de pessoal para trabalhar em cenário de terapia intensiva deve considerar as experiências e a formação especializada dos enfermeiros.

  1. Multinacionais brasileiras: o papel da tecnologia na conquista do mercado externo

    Directory of Open Access Journals (Sweden)

    Eva Stal

    2005-01-01

    Full Text Available O trabalho tem como objetivo mostrar a importância do processo de internacionalização de empresas de países em desenvolvimento, que enfrentam a competição global, uma vez que a produção fora do país ajuda a estimular as exportações de matérias-primas, componentes e produtos acabados, sobretudo em setores industriais produtores de bens diferenciados e de maior conteúdo tecnológico. Além disso, a exposição a mercados mais exigentes facilita a incorporação de novas tecnologias e a capacitação de pessoal. Com base nas teorias comportamentais e econômicas que explicam o processo de internacionalização de empresas, foi realizado estudo de caso na empresa Sabó, do setor de autopeças, e uma das poucas empresas nacionais que sobreviveram à abertura econômica do país, a partir de 1990, devido ao seu caráter inovador, que lhe permite competir com as maiores empresas do ramo no mercado internacional. Conclui-se que, quando as empresas possuem um forte ativo, no caso a tecnologia inovadora, as teorias econômicas explicam melhor o sucesso internacional.

  2. Tecnologia para o autocuidado da saúde sexual e reprodutiva de mulheres estomizadas

    Directory of Open Access Journals (Sweden)

    Andressa Ferreira Leite Ladislau Albuquerque

    Full Text Available RESUMO Objetivo: validar uma tecnologia do tipo cartilha impressa para o autocuidado na saúde sexual e reprodutiva de mulheres estomizadas. Método: estudo metodológico, com foco na construção e validação de cartilha impressa. O conteúdo da cartilha foi validado por 11 enfermeiros juízes especialistas, segundo o Índice de Validade de Conteúdo (CVI maior ou igual a 0,80. A aparência foi validada por 9 mulheres estomizadas segundo avaliação da dificuldade e da conveniência do material educativo. Resultados: a cartilha foi considerada válida segundo os especialistas, com média global de CVI igual a 0,87 e, segundo o público-alvo, com 100% de concordância quanto à adequação da organização, estilo da escrita, aparência e motivação da cartilha. Conclusão: a tecnologia educativa em questão foi validada segundo conteúdo e aparência, constituindo-se, portanto, em um recurso adequado, confiável e de fácil compreensão para a aquisição de conhecimentos sobre o autocuidado na saúde sexual e reprodutiva de mulheres estomizadas.

  3. TECNOLOGIAS PARA REUTILIZAÇÃO DE ÁGUAS RESIDUÁRIAS

    Directory of Open Access Journals (Sweden)

    Melhores Trabalhos .

    2015-02-01

    Full Text Available As tecnologias de aproveitamento de água são soluções sustentáveis e contribuem para uso racional da água, proporcionando a conservação dos recursos hídricos para as futuras gerações. O aumento contínuo da população mundial é responsável pela crescente escassez de água natural, bem como a disposição inadequada de efluentes líquidos, a heterogeneidade na distribuição de água e falta de cuidado na sua utilização. É urgente implementar o uso racional da água e a preservação das fontes de água, abrangendo os mecanismos, tais como políticas efetivas para os recursos hídricos e seu uso adequado adoção obrigatória do uso da água adequada, tratamento de esgoto doméstico e industrial, e práticas de reutilização. O estudo apresenta um levantamento sobre a conceituação de “reuso de água”, faz uma análise desta prática, e descreve algumas tecnologias de sistemas de tratamento que propiciam a recirculação do efluente, citando suas etapas, processos utilizados, vantagens e desvantagens.

  4. LINGUAGEM, TECNOLOGIAS E MÍDIA: PERSPECTIVAS DA NARRATIVA ORAL URBANA

    Directory of Open Access Journals (Sweden)

    Mauren Pavao Przybylski

    2012-01-01

    Full Text Available O avanço tecnológico deixou marcas nos mais diversos âmbitos da sociedade, seja no social, politico ou econômico e a narrativa não deixou de acompanhar esses avanços. Narrar sua subjetividade é próprio do ser humano, desde os primórdios, e as mídias surgem como uma nova ferramenta que auxilia na forma como o indivíduo se inscreve e se legitima no mundo. A verdade é que as tecnologias podem ser lidas como mais um espaço de legitimação da produção cultural de indivíduos ditos marginalizados, ou, aos moldes de Gaytri Spivak, subalternos. A narrativa oral urbana dá a oportunidade aos marginalizados de se reinventarem e de mostrarem suas habilidades, sejam elas artísticas, culturais, etc. Este artigo pretende ser uma reflexão acerca da importância da linguagem e do uso das tecnologias e mídias para a valorização de narrativas orais urbanas produzidas em um bairro periférico, a Restinga, 30 km ao sul do centro de Porto Alegre, por indivíduos à margem e que nem por isso deixam de permitir um olhar desde uma perspectiva canônica.

  5. Contemporaneidade, educação e tecnologia Contemporaneity, education and technology

    Directory of Open Access Journals (Sweden)

    Antonio Flavio Barbosa Moreira

    2007-10-01

    Full Text Available O texto aborda o papel das tecnologias da comunicação e da informação na educação hoje. Questiona esse papel, discute o que deve ser compreendido por qualidade na educação, assim como examina a concepção de uma formação, a ser construída nos cursos que preparam professores e gestores, capaz de imprimir (uma outra qualidade à educação e de contribuir para que o uso dos recursos tecnológicos facilite a discussão da cultura e se coloque a favor de um projeto de emancipação. Argumenta que uma educação de qualidade demanda, entre outros elementos, tanto uma visão crítica dos processos escolares quanto usos apropriados e criteriosos das novas tecnologias.This paper focuses on the role of technologies in education today. It questions this role, discusses what has to be understood as quality in education and examines the conception of a teachers and administrators' training course capable of offering (another quality to education and of contributing to a use of technological resources that promotes the discussion of culture and favors an emancipation project. It argues that quality in education requires, among other elements, both a critical view of school processes and appropriate and criterious uses of the new technologies.

  6. Indicadores da participação feminina em Ciência e Tecnologia

    Directory of Open Access Journals (Sweden)

    Maria Cristina Piumbato Innocentini Hayashi

    Full Text Available Este trabalho tem por objetivo analisar a questão do gênero no setor de ciência e tecnologia nacional e examinar a situação das docentes que pertencem à comunidade científica da Universidade Federal de São Carlos (UFSCar. O estudo baseou-se em teorias sobre as questões do gênero na ciência e da participação feminina. Para a coleta de dados, utilizou-se o Diretório de Grupos de Pesquisa no Brasil/CNPq. Para aprofundamento da realidade das mulheres na UFSCar, realizou-se um levantamento adicional nos sites da instituição e do Instituto Brasileiro de Informação em Ciência e Tecnologia (IBICT. Conforme revelam os dados do Diretório, em 1995, a participação feminina alcançou 39% dos cientistas e, em 2004, passou para 47%. Na UFSCar, as mulheres representam 39,3% dos docentes, ocupam 1/3 dos postos de comando e entre os discentes superam 55% dos estudantes. Destaca-se que ainda falta um caminho a percorrer para igualarem-se aos pesquisadores nos postos acadêmicos e áreas do conhecimento mais prestigiadas. Utilizar o potencial feminino é estratégico para avançar cientificamente.

  7. Canopy Opener e assistência de ar no controle da ferrugem asiática e produtividade da cultura da soja

    OpenAIRE

    Prado, Evandro Pereira [UNESP

    2012-01-01

    Com a finalidade de comparar diferentes tecnologias de aplicação em pulverizações terrestre no controle da ferrugem asiática da soja (FAS), o trabalho objetivou construir um dispositivo abridor do dossel da soja e comparar diferentes tecnologias de aplicação de fungicida sobre os depósitos, controle da FAS e produtividade da soja. A confecção do dispositivo Canopy opener (CO) foi baseada no protótipo desenvolvido por pesquisadores do Departamento de Agricultura dos Estados Unidos da América (...

  8. Physicist makes muon chamber sing

    CERN Document Server

    2007-01-01

    This Monitored Drift Tube detector, consisting of argon-CO2-filled aluminium tubes with a wire down the centre of each, will track muons in ATLAS; Tiecke used a single tube from one of these detectors to create the pipes in his organ. Particle physicists can make good musicians; but did you know particle detectors can make good music? That's what NIKHEF physicist Henk Tiecke learned when he used pipes cut from the ATLAS Monitored Drift Tube detector (MDT) to build his own working Dutch-style barrel organ in the autumn of 2005. 'I like to work with my hands,' said Tiecke, who worked as a senior physicist at NIKHEF, Amsterdam, on ZEUS until his retirement last summer. Tiecke had already constructed his barrel organ when he visited some colleagues in the ATLAS muon chambers production area at Nikhef in 2005. He noticed that the aluminium tubes they were using to build the chambers were about three centimetres in diameter-just the right size for a pipe in a barrel organ. 'The sound is not as nice as from wooden...

  9. Limits to Drift Chamber Resolution

    CERN Document Server

    Riegler, Werner

    1998-01-01

    ATLAS (A Large Toroidal LHC Apparatus) will be a general-purpose experiment at the Large Hadron Collider that will be operational at CERN in the year 2004. The ATLAS muon spectrometer aims for a momentum resolution of 10% for a transverse momentum of pT=1TeV. The precision tracking devices in the muon system will be high pressure drift tubes (MDTs) with a single wire resolution of 1100 chambers covering an area of ≈ 2500m2. The high counting rates in the spectrometer as well as the aim for excellent spatial resolution and high efficiency put severe constraints on the MDT operating parameters. This work describes a detailed study of all the resolution limiting factors in the ATLAS environment. A ’full chain’ simulation of the MDT response to photons and charged particles as well as quantitative comparisons with measurements was performed. The good agreement between simulation and measurements resulted in a profound understanding of the drift chamber processes and the individual contributions to the spat...

  10. RETAINED STONE PIECE IN ANTERIOR CHAMBER

    Directory of Open Access Journals (Sweden)

    ZvornicaninJasmin, Nadarevic-VodencarevicAmra

    2015-04-01

    Full Text Available ABSTRACT We read with interest the article by Surekha et al. regarding the retained stone piece in anterior chamber. Similar to the results of previous studies, the authors found that delayed intraocular foreign body (IOFB management can result in good visual outcome without an apparent increased risk of endophthalmitis or other deleterious side effects. However, the authors failed to explain the exact reason for the diminution of vision in patients left eye. It is unclear what the uncorrected visual acuity was and what kind of correction was used, more precisely type and amount of cylinder, given the presence of the corneal opacity. Since the size of the IOFB is approximately 4x4x1mm, significant irido-corneal angle changes resulting in intraocular pressure raise and optic nerve head damage can be expected. Traumatic glaucoma following open globe injury can occur in 2.7 to 19% of cases, with several risk factors associated with glaucoma development (advanced age, poor visual acuity at presentation,perforating rather than penetrating ocular injury,lens injury, presence of vitreous hemorrhage and presence of an IOFB. Earlier reportsof latetraumaticoptic neuropathy onset, even after several years, indicate that this possibility cannot be completely ruled out too. Therefore, repeated intraocular pressure measurements, gonioscopy, pupillary reaction assessment, together with through posterior segment examination including visual field and optical coherence tomography examinations can be useful in determining the possible optic nerve damage as one of the possible reasons for visual acuity reduction. The authors did not suggest any operative treatment at this time. However, it should bear in mind that the inert anterior chamber IOFB could be a risk factor for non-infectious endophthalmitis development even after many years. Also, long term retained anterior chamber foreign body leads to permanent endothelial cell loss and can even result in a corneal

  11. Sexual dimorphism of the internal mandibular chamber in Fayum Pliohyracidae (Mammalia)

    Science.gov (United States)

    de Blieux, D.D.; Baumrind, M.R.; Simons, E.L.; Chatrath, P.S.; Meyer, G.E.; Attia, Y.S.

    2006-01-01

    An internal mandibular fenestra and chamber are found in many fossil hyracoids. The internal mandibular fenestra is located on the lingual surface of the mandibular corpus and opens into a chamber within the mandible. The mandibular chamber is maximally developed in late Eocene Thyrohyrax meyeri and early Oligocene Thyrohyrax domorictus from the Fayum Province of Egypt. The function of this chamber is unknown as it is not found in extant hyraxes, nor is it known to occur in any other mammal. In Thyrohyrax, this feature appears to be sexually dimorphic because it is confined to roughly one half of the specimens that otherwise cannot be separated by dental characteristics or measurements. It has been suggested that the chamber is found in females based on the presumed distribution of this character in other fossil hyracoids. Fossils from Fayum Quarry L-41, preserving the sexually dimorphic anterior dentition, show that, in Thyrohyrax meyeri and Thyrohyrax domorictus, the internal mandibular chamber is found in males. In Thyrohyrax litholagus, an internal mandibular fenestra and inflated mandibular chamber occurs in males whereas females show the variable presence of an internal mandibular fossa or fenestra but lack an expanded chamber. Other genera show differing patterns of sexual variation in which some Fayum hyracoids have an internal mandibular fenestra in both sexes but with the greatest development of the mandibular chamber occurring in males. We review functions proposed for the internal mandibular chamber and suggest that it housed a laryngeal air sac that may have had a vocal function by acting as a resonating chamber. ?? 2006 by the Society of Vertebrate Paleontology.

  12. Transferring calibration coefficients from ionisation chambers used for diagnostic radiology to transmission chambers.

    Science.gov (United States)

    Yoshizumi, Maíra T; Caldas, Linda V E

    2012-07-01

    In this work, the response of a double volume transmission ionisation chamber, developed at the Instituto de Pesquisas Energéticas e Nucleares, was compared to that of a commercial transmission chamber. Both ionisation chambers were tested in different X-ray beam qualities using secondary standard ionisation chambers as reference dosimeters. These standard ionisation chambers were a parallel-plate and a cylindrical ionisation chambers, used for diagnostic radiology and mammography beam qualities, respectively. The response of both transmission chambers was compared to that of the secondary standard chambers to obtain coefficients of equivalence. These coefficients allow the transmission chambers to be used as reference equipment. Copyright © 2011 Elsevier Ltd. All rights reserved.

  13. Mobilidades cotidianas das crianças: combinando etnografia, gps e tecnologias de telefone móvel em pesquisa

    DEFF Research Database (Denmark)

    Christensen, Pia Hartrup; Mikkelsen, Miguel Romero; Nielsen, Thomas Alexander Sick

    2014-01-01

    Este artigo discute o desenvolvimento de uma abordagem com métodos mistos para o estudo da mobilidade diária das crianças. O estudo aqui apresentado combinou pesquisa etnográfica com a tecnologia de GPS ( Global Positioning System ) e um questionário interativo que as crianças completaram via tel...

  14. Tecnologias não convencionais de coleta de dados em dissertações e teses brasileiras

    Directory of Open Access Journals (Sweden)

    Pétala Tuani Candido de Oliveira Salvador

    2015-04-01

    Full Text Available RESUMO Objetivo: caracterizar as tecnologias não convencionais utilizadas para a coleta de dados das dissertações e teses disponíveis no Catálogo de Teses e Dissertações (CEPEn da Associação Brasileira de Enfermagem (ABEn. Método: pesquisa documental, com coleta de dados realizada nos catálogos de teses e dissertações disponíveis no sítio da ABEn, do Volume XIX ao Volume XXI. Foram elencados como indicadores de coleta: nível acadêmico; instituição de ensino; ano; formação do autor; local; tecnologia não convencional utilizada; tipo de tecnologia; associação com técnicas convencionais; desenho metodológico; benefícios e limitações metodológicas. Resultados: de um quantitativo de 6346 estudos, apenas 121 (1,91% utilizaram tecnologias não convencionais para coleta de dados, representando a amostra final da pesquisa. Conclusão: conclui-se que as pesquisas da Enfermagem brasileira ainda carecem de inovações metodológicas de coleta de dados.

  15. Filosofia da tecnologia e Educação Física: tensões a partir do corpo

    Directory of Open Access Journals (Sweden)

    Fabio Zoboli

    2014-11-01

    Full Text Available http://dx.doi.org/10.5007/2175-8042.2014v26n43p287 Artigo com o objetivo de apresentar e situar a Filosofia da Tecnologia como disciplina que aborda questões importantes aos estudos das intervenções do corpo em face à tecnologia ligada a estudos vinculados à Educação Física. A partir de uma busca em 05 periódicos do campo, visualizou-se 03 temas para análise: virtualização do corpo/movimento; doping; corpo acoplado à tecnologia. Como resultado, encontra textos que apresentam questões ligadas à Filosofia da Tecnologia – problematizações de cunho epistemológico, ontológico e axiológico. Conclui com reflexões sobre o levantamento realizado, lançando algumas questões para perspectivar estudos a partir da configuração encontrada.

  16. Mobilidades cotidianas das crianças: combinando etnografia, gps e tecnologias de telefone móvel em pesquisa

    DEFF Research Database (Denmark)

    Christensen, Pia Hartrup; Mikkelsen, Miguel Romero; Nielsen, Thomas Alexander Sick;

    2014-01-01

    Este artigo discute o desenvolvimento de uma abordagem com métodos mistos para o estudo da mobilidade diária das crianças. O estudo aqui apresentado combinou pesquisa etnográfica com a tecnologia de GPS ( Global Positioning System ) e um questionário interativo que as crianças completaram via...

  17. Avaliação de tecnologia educativa na modalidade literatura de cordel sobre amamentação

    Directory of Open Access Journals (Sweden)

    Paula Marciana Pinheiro de Oliveira

    2013-02-01

    Full Text Available Este trabalho objetivou descrever o processo de avaliação de tecnologia educativa, com relação aos aspectos de conteúdo e literatura de cordel sobre amamentação. Foi realizado de março a setembro de 2009, com juízes especialistas em conteúdo e literatura de cordel, e como referencial teórico-metodológico adotou-se o Modelo da Psicometria concretizando o polo teórico. Na coleta de dados utilizou-se instrumento para avaliar conteúdo e regras da literatura de cordel. A análise foi feita mediante comparações das anotações dos juízes e reflexão crítica. Respeitaram-se os aspectos éticos. A tecnologia educativa recebeu ajustes após pareceres até sua aprovação pelos juízes, e as contribuições foram válidas por colaborar com o processo de avaliação da tecnologia. Avaliar tecnologias educativas para disponibilização é uma forma de favorecer a redução dos possíveis fatores encontrados como obstáculos e, com isso, melhorar a qualidade de vida.

  18. Avaliação de tecnologia educativa na modalidade literatura de cordel sobre amamentação

    Directory of Open Access Journals (Sweden)

    Paula Marciana Pinheiro de Oliveira

    Full Text Available Este trabalho objetivou descrever o processo de avaliação de tecnologia educativa, com relação aos aspectos de conteúdo e literatura de cordel sobre amamentação. Foi realizado de março a setembro de 2009, com juízes especialistas em conteúdo e literatura de cordel, e como referencial teórico-metodológico adotou-se o Modelo da Psicometria concretizando o polo teórico. Na coleta de dados utilizou-se instrumento para avaliar conteúdo e regras da literatura de cordel. A análise foi feita mediante comparações das anotações dos juízes e reflexão crítica. Respeitaram-se os aspectos éticos. A tecnologia educativa recebeu ajustes após pareceres até sua aprovação pelos juízes, e as contribuições foram válidas por colaborar com o processo de avaliação da tecnologia. Avaliar tecnologias educativas para disponibilização é uma forma de favorecer a redução dos possíveis fatores encontrados como obstáculos e, com isso, melhorar a qualidade de vida.

  19. Effect of Some Parameters on the Cast Component Properties in Hot Chamber Die Casting

    Science.gov (United States)

    Singh, Rupinder; Singh, Harvir

    2016-04-01

    Hot chamber die casting process is designed to achieve high dimensional accuracy for small products by forcing molten metal under high pressure into reusable moulds, called dies. The present research work is aimed at study of some parameters (as a case study of spring adjuster) on cast component properties in hot chamber die casting process. Three controllable factors of the hot chamber die casting process (namely: pressure at second phase, metal pouring temperature and die opening time) were studied at three levels each by Taguchi's parametric approach and single-response optimization was conducted to identify the main factors controlling surface hardness, dimensional accuracy and weight of the casting. Castings were produced using aluminium alloy, at recommended parameters through hot chamber die casting process. Analysis shows that in hot chamber die casting process the percentage contribution of second phase pressure, die opening time, metal pouring temperature for surface hardness is 82.48, 9.24 and 6.78 % respectively. While in the case of weight of cast component the contribution of second phase pressure is 94.03 %, followed by metal pouring temperature and die opening time (4.58 and 0.35 % respectively). Further for dimensional accuracy contribution of die opening time is 76.97 %, metal pouring temperature is 20.05 % and second phase pressure is 1.56 %. Confirmation experiments were conducted at an optimal condition showed that the surface hardness, dimensional accuracy and weight of the castings were improved significantly.

  20. SOCIEDADE, TECNOLOGIAS E EDUCAÇÃO: as Tecnologias da Informação e Comunicação e o pensar da sociedade concreta.

    Directory of Open Access Journals (Sweden)

    José Anderson Santos Cruz

    2014-04-01

    Full Text Available A sociedade da informação está cada vez mais incorporando o imenso volume de conteúdos disponíveis na rede. O acesso por dispositivos eletrônicos e a facilidade resultante da mobilidade e da portabilidade alimenta discussões sobre a capacidade real de apropriação desse conhecimento que circula pelo ciberespaço. Abordar e discutir as possibilidades de educar pela rede, portanto, ganha cada vez mais relevância. Diante de modelos de qualidade educativa bem desenvolvidos – como acontece na Finlândia, por exemplo –, a educação brasileira vai sendo, ano a ano, reprovada nas maratonas internacionais por atingir índices abaixo da média exigida. Cria-se um campo de análise, no qual este artigo se coloca, na busca por entender mais profundamente a oportunidade de utilização das Tecnologias de Comunicação e Informação (TIC para uma educação de qualidade, mergulhando pelas questões culturais que se inserem na construção das condições objetivas oferecidas aos educandos brasileiros. Trata-se de um esforço na compreensão dos fatores históricos que limitam os esforços para o oferecimento de uma educação de qualidade no Brasil.

  1. Ion distributions in plane and cylindrical chambers.

    Science.gov (United States)

    Rosen, R; George, E P

    1975-11-01

    The ion chamber equations of Thomson include both ion recombination and space-charge terms. Neglecting the space-charge term, an exact solution is obtained for the ion densities across a plane ionization chamber. The method is extended to the cylindrical chamber, and examples are given of the expected ion distributions in both geometries. Current-voltage relationships are derived for both chambers and compared with those of other workers. If the space-charge term is retained, the ion chamber equations for both geometries are not soluble in closed form. The cylindrical chamber is considered and a computer solution is obtained for the ion distributions and current. Comparison with the nonspace-charge solution shows that while there is only a small difference in the current-voltage relationship, a significant difference can occur in the ion concentrations.

  2. A mathematical model of aerosol holding chambers

    DEFF Research Database (Denmark)

    Zak, M; Madsen, J; Berg, E

    1999-01-01

    A mathematical model of aerosol delivery from holding chambers (spacers) was developed incorporating tidal volume (VT), chamber volume (Vch), apparatus dead space (VD), effect of valve insufficiency and other leaks, loss of aerosol by immediate impact on the chamber wall, and fallout of aerosol...... in the chamber with time. Four different spacers were connected via filters to a mechanical lung model, and aerosol delivery during "breathing" was determined from drug recovery from the filters. The formula correctly predicted the delivery of budesonide aerosol from the AeroChamber (Trudell Medical, London......, Ontario, Canada), NebuChamber (Astra, Södirtälje, Sweden) and Nebuhaler (Astra) adapted for babies. The dose of fluticasone proportionate delivered by the Babyhaler (Glaxco Wellcome, Oxbridge, Middlesex, UK) was 80% of that predicted, probably because of incomplete priming of this spacer. Of the above...

  3. Tests of anechoic chamber for aeroacoustics investigations

    Science.gov (United States)

    Palchikovskiy, V. V.; Bersenev, Yu. V.; Makashov, S. Yu.; Belyaev, I. V.; Korin, I. A.; Sorokin, E. V.; Khramtsov, I. V.; Kustov, O. Yu.

    2016-10-01

    The paper presents the results of qualification tests in the new anechoic chamber of Perm National Research Polytechnic University (PNRPU) built in 2014-2015 and evaluation of the chamber quality in aeroacoustic experiments. It describes design features of the chamber and its sound-absorption lining. The qualification tests were carried out with tonal and broadband noise sources in the frequency range 100 Hz - 20 kHz for two different cases of the source arrangement. In every case, measurements were performed in three directions by traverse microphones. Qualification tests have determined that in the chamber there is a free acoustic field within radius of 2 m for tonal noise and 3 m for broadband noise. There was also evaluated acoustic quality of the chamber by measurements of the jet noise and vortex ring noise. The results of the experiments demonstrate that PNRPU anechoic chamber allows the aeroacoustic measurements to be performed to obtain quantitative results.

  4. Escolha de Tecnologia em Organizações de Saúde: Proposta de um Modelo de Análise

    Directory of Open Access Journals (Sweden)

    Nikiforos Joannis Philyppis

    2013-08-01

    Full Text Available O objetivo do trabalho é apresentar um modelo de escolha de tecnologia em organizações de saúde. Primeiramente, foi feita uma revisão bibliográfica da literatura sobre escolha de tecnologia. Em segundo lugar, a revisão focou os poucos artigos sobre adoção de tecnologia em instituições de saúde. Verificou-se que a maior parte da literatura tem origem na Economia, sugerindo maiores pesquisas que auxiliem os gestores das organizações de saúde no processo de escolha e adoção de novas tecnologias. Em terceiro lugar, fez-se uma busca na literatura de comportamento de compra organizacional para, ao final, propor um modelo prescritivo que considera todas as variáveis selecionadas da literatura nas diversas etapas da pesquisa. É apresentado o Modelo de Escolha de Tecnologia em Saúde (METS explicando-se a relação entre as suas variáveis e a escolha de tecnologia. A discussão denota a utilidade do modelo tanto para empresas fornecedoras quanto para empresas adotantes de novas tecnologias.

  5. Open-top Chamber for in situ Research on Response of Mercury Enrichment in Rice to the Rising Gaseous Elemental Mercury in the Atmosphere%开顶式气室原位研究水稻汞富集对大气汞浓度升高的响应

    Institute of Scientific and Technical Information of China (English)

    陈剑; 王章玮; 张晓山; 秦普丰; 陆海军

    2015-01-01

    In situ research was conducted on the response of mercury enrichment in rice organs to elevated gaseous elemental mercury (GEM) with open-top chambers ( OTCs) fumigation experiment and soil Hg enriched experiment. The results showed that Hg concentrations in roots were generally correlated with soil Hg concentrations (R = 0. 998 8, P 0. 05), indicating that Hg in rice roots was mainly from soil. Hg concentrations in stems increased linearly (RB = 0. 964 6, RU = 0. 983 1, P 0.05),与土壤汞含量呈显著正相关(R=0.9988,P<0.05),表明水稻根中的汞主要来自于对土壤中汞的吸收累积.水稻茎中汞含量随大气汞质量浓度的升高呈线性增加(RB=0.9646,RU=0.9831,P<0.05),且上部茎中汞含量高于下部茎;茎下部汞含量随土壤汞含量的升高呈线性增加(R=0.9901,P<0.05),茎上部汞含量随土壤汞含量的升高呈二次拟合增加(R=0.9989,P<0.05),且下部茎汞含量高于上部茎,说明茎汞含量受土壤和大气汞浓度的共同影响.水稻叶中汞含量与大气汞质量浓度呈显著正相关(R=0.9985,P<0.05),与土壤汞含量也有很好的线性关系(R=0.9983,P=0.0585),表明水稻从大气吸收的汞主要积累在叶片中,从土壤吸收的汞主要富集在根中并通过茎部向叶部传输.利用实验建立的函数关系对水稻地上生物质中汞的大气来源估算,至少60%~94%和56%~77%水稻叶和上部茎中的汞来自大气,而大气对下部茎仅贡献8%~56%.由此水稻地上部分生物质汞主要来自对大气汞的吸收,为区域大气汞的收支及汞循环模型提供理论依据.

  6. The CAST Time Projection Chamber

    CERN Document Server

    Autiero, D; Cébrian, S; Carmona, J M; Chesi, Enrico Guido; Davenport, M; Delattre, M; Di Lella, L; Formenti, F; Gomez, H; Hasinoff, M; Irastorza, I G; Lakic, B; Luzón, G; Morales, J; Musa, L; Ortiz, A; Placci, A; Rodríguez, A; Ruz, J; Villar, J A; Zioutas, K

    2007-01-01

    One of the three X-ray detectors of the CAST experiment searching for solar axions is a Time Projection Chamber (TPC) with a multi-wire proportional counter (MWPC) as a readout structure. Its design has been optimized to provide high sensitivity to the detection of the low intensity X-ray signal expected in the CAST experiment. A low hardware threshold of 0.8 keV is safely set during normal data taking periods, and the overall efficiency for the detection of photons coming from conversion of solar axions is 62 %. Shielding has been installed around the detector, lowering the background level to 4.10 x 10^-5 counts/cm^2/s/keV between 1 and 10 keV. During phase I of the CAST experiment the TPC has provided robust and stable operation, thus contributing with a competitive result to the overall CAST limit on axion-photon coupling and mass.

  7. The ARGUS microvertex drift chamber

    Science.gov (United States)

    Michel, E.; Schmidt-Parzefall, W.; Appuhn, R. D.; Buchmüller, J.; Kolanoski, H.; Kreimeier, B.; Lange, A.; Siegmund, T.; Walther, A.; Edwards, K. W.; Fernholz, R. C.; Kapitza, H.; MacFarlane, D. B.; O'Neill, M.; Parsons, J. A.; Prentice, J. D.; Seidel, S. C.; Tsipolitis, G.; Ball, S.; Babaev, A.; Danilov, M.; Tichomirov, I.

    1989-11-01

    The ARGUS collaboration is currently building a new microvertex drift chamber (μVDC) as an upgrade of their detector. The μVDC is optimized for B-meson physics at DORIS energies. Important design features are minimal multiple scattering for low-momentum particles and three-dimensional reconstruction of decay vertices with equal resolutions in r- φ and r- z. Vertex resolutions of 15-25 μm are expected. Prototypes of the μVDC have been tested with different gas mixtures at various pressures. Spatial resolutions as small as 20 μm were obtained using CO 2/propane at 4 bar and DME at 1 bar. New readout electronics have been developed for the μVDC aiming at low thresholds for the TDC measurements. Employing a novel idea for noise and cross-talk suppression, which is based on a discrimination against short pulses, very low threshold settings are possible.

  8. Drift chamber tracking with neural networks

    Energy Technology Data Exchange (ETDEWEB)

    Lindsey, C.S.; Denby, B.; Haggerty, H.

    1992-10-01

    We discuss drift chamber tracking with a commercial log VLSI neural network chip. Voltages proportional to the drift times in a 4-layer drift chamber were presented to the Intel ETANN chip. The network was trained to provide the intercept and slope of straight tracks traversing the chamber. The outputs were recorded and later compared off line to conventional track fits. Two types of network architectures were studied. Applications of neural network tracking to high energy physics detector triggers is discussed.

  9. Vacuum Chamber for the Booster Bending Magnets

    CERN Multimedia

    1974-01-01

    To minimize eddy currents, induced by the rising magnetic field, the chamber was made from thin stainless steel of high specific electric resistance. For mechanical stength, it was corrugated in a hydro-forming process. The chamber is curved, to follow the beam's orbital path. Under vacuum, the chamber tends to staighten, the ceramic spacer along half of its length keeps it in place (see also 7402458).

  10. Bubble chamber: Omega production and decay

    CERN Multimedia

    1973-01-01

    This image is taken from one of CERN's bubble chambers and shows the decay of a positive kaon in flight. The decay products of this kaon can be seen spiraling in the magnetic field of the chamber. The invention of bubble chambers in 1952 revolutionized the field of particle physics, allowing real tracks left by particles to be seen and photographed by expanding liquid that has been heated to boiling point.

  11. 模拟大气温度和CO2浓度升高对双季稻氮素利用的影响%Effects of Elevated Air Temperature and Carbon Dioxide Concentration on Ni-trogen Use of Double Rice (Oryza sativaL.) in Open-top Chambers

    Institute of Scientific and Technical Information of China (English)

    王斌; 万运帆; 郭晨; 李玉娥; 游松财; 秦晓波; 陈汇林

    2015-01-01

    Preventing 2°C of warming and restricting the CO2 level to 450 µL L–1 are the safety threshold for climate change based on the Copenhagen Consensus. It is an important reference for the security of rice yield to study the influence of elevated air temperature and CO2 concentration on the nitrogen use of rice. In this paper, a modified open-top chamber (OTC) device was used to simulate relative 60 µL L–1 CO2 concentration rise (based on CO2 background concentration of 390 µL L–1) and 2°C tempera-ture increase scenario in a double rice field experiment with Liangyou 287 and Xiangfengyou 9 as the early and late rice varieties respectively. There were five treatments with three replications: 1) UC: Paddy field without OTC cover; 2) CK: Check OTC with the similar temperature and CO2 concentration to the field environment; 3) CT: OTC with 2°C temperature increase; 4) CC: OTC with 60 µL L–1 CO2 concentration elevated; 5) CTC: OTC with 2°C temperature increase and 60 µL L–1 CO2 concentration ele-vated. The nitrogen accumulation, translocation and utilization in different treatments were explored. The results showed signifi-cant interactions between temperature increase and CO2 concentration elevated on the yield and nitrogen use. In early rice CC and CTC achieved an increase for grain yield (19.7% and 2.0%) and nitrogen accumulation (15.7% and 5.1%) compared with CK while CT presented a decrease. In late rice warming and high CO2concentration (CT, CC, and CTC) benefited the grain yield and nitrogen uptake, increasing 9.2%, 14.4%, 18.8% and 7.3%, 10.2%, 15% compared with CK respectively. Nitrogen translocation and contribution efficiency (from stem and leaf to grain) of CC and CTC was lower than that of CK in early rice, and higher than that of CK in late rice. Nitrogen recovery efficiency of CC and CTC reached to 45.7% and 48.5% in early and late rice respec-tively, achieving the highest increase of 35.3% and 33.1% compared with that of CK. CC and CTC

  12. Uma metodologia de análise estratégica da tecnologia A methodology for strategic evaluation of technology

    Directory of Open Access Journals (Sweden)

    Marcelo Caldeira Pedroso

    1999-04-01

    Full Text Available O presente trabalho propõe uma metodologia de análise estratégica da tecnologia nas empresas. Para tanto, ele apresenta uma conceituação e uma classificação de tecnologia, bem como adota um conjunto de critérios competitivos desdobrados da manufatura. A partir destas questões, é apresentada uma metodologia de análise estratégica da tecnologia que é estruturada na inter-relação entre os tipos de tecnologia e os critérios competitivos da manufatura adotados. A aplicação da metodologia proposta considera as abordagens 'technological-push' e 'marketing-pull' como impulsionadoras da decisão da adoção de novas tecnologias. Ao final, o trabalho apresenta um exemplo de aplicação que utiliza a teoria dos conjuntos difusos ('fuzzy set theory', bem como algumas conclusões sobre a metodologia proposta.This paper proposes a methodology for the strategic evaluation of technology in manufacturing companies. With this aim, the article discusses a technology concept and taxonomy, and adopts an extended set of manufacturing competitive criteria. On this basis, a methodology of strategic technology analysis is proposed which is based on the relationships between the proposed technology taxonomy and the set of competitive manufacturing criteria adopted. The proposed model also considers the technological-push and marketing-pull approaches as decision drivers for the adoption of new technology. This paper also presents a case study which considers the fuzzy set theory and some conclusions about the proposed methodology.

  13. Engineering verification of the biomass production chamber

    Science.gov (United States)

    Prince, R. P.; Knott, W. M., III; Sager, J. C.; Jones, J. D.

    1992-01-01

    The requirements for life support systems, both biological and physical-chemical, for long-term human attended space missions are under serious study throughout NASA. The KSC 'breadboard' project has focused on biomass production using higher plants for atmospheric regeneration and food production in a special biomass production chamber. This chamber is designed to provide information on food crop growth rate, contaminants in the chamber that alter plant growth requirements for atmospheric regeneration, carbon dioxide consumption, oxygen production, and water utilization. The shape and size, mass, and energy requirements in relation to the overall integrity of the biomass production chamber are under constant study.

  14. The Mark II Vertex Drift Chamber

    Energy Technology Data Exchange (ETDEWEB)

    Alexander, J.P.; Baggs, R.; Fujino, D.; Hayes, K.; Hoard, C.; Hower, N.; Hutchinson, D.; Jaros, J.A.; Koetke, D.; Kowalski, L.A.

    1989-03-01

    We have completed constructing and begun operating the Mark II Drift Chamber Vertex Detector. The chamber, based on a modified jet cell design, achieves 30 {mu}m spatial resolution and <1000 {mu}m track-pair resolution in pressurized CO{sub 2} gas mixtures. Special emphasis has been placed on controlling systematic errors including the use of novel construction techniques which permit accurate wire placement. Chamber performance has been studied with cosmic ray tracks collected with the chamber located both inside and outside the Mark II. Results on spatial resolution, average pulse shape, and some properties of CO{sub 2} mixtures are presented. 10 refs., 12 figs., 1 tab.

  15. Precision Radio Frequency Anechoic Chamber Facility

    Data.gov (United States)

    Federal Laboratory Consortium — FUNCTION: Performs measurements and calibration of antennas for satellites and aircraft or groundbased systems. The chamber is primarily used for optimizing antenna...

  16. Bicone vacuum chamber for ISR intersection

    CERN Document Server

    1975-01-01

    This is one of the bicone chambers made of titanium for experiment R 702. The central corrugated part had a very thin titanium wall (0.28 mm). The first of these chambers collapsed in its central part when baked at 300 C (August 1975). After an intensive effort to develop better quality and reproducible welds for this special material, the ISR workshop was able to build two new chambers of this type. One of them was installed at I 7 for R 702 in 1976 and worked perfectly. It was at that time the most "transparent" intersection vacuum chamber. See also 7609219, 7609221.

  17. Estat de l'art i simulació d'aplicacjó pràctica de la tecnologia RFID

    OpenAIRE

    Borrego Ortiz, Sergio

    2014-01-01

    El present projecte té com a principal objectiu l’adquisició de coneixement sobre la tecnologia RFID suficient com per a poder desenvolupar en un futur projectes més complexes amb aquesta tecnologia. La primera part del projecte és una part teòrica enfocada en aspectes tècnics sobre la tecnologia RFID com per exemple els seus estàndards més importants, protocols anticol·lisió o seguretat. Una segona part del projecte esta dedicada al desenvolupament d’una petita aplicació pràctica on es pugui...

  18. O problema das restrições teórico-analíticas nos estudos sociais da ciência e da tecnologia

    Directory of Open Access Journals (Sweden)

    Denise Maria Nunes

    2012-04-01

    Full Text Available http://dx.doi.org/10.5007/1806-5023.2011v8n2p120 O livro Actos, actores y artefactos: Sociologia de la tecnologia, organizado por Hernán Thomas e Alfonso Buch apresenta e debate ferramentas teórico-conceituais de autores consagrados na área da Sociologia da Ciência e da Tecnologia. Lançado em 2008, o livro é, sem dúvida, leitura obrigatória para os estudiosos que se interessam pelas relações envolvendo ciência, tecnologia e sociedade.

  19. Vacuum chambers full of ideas for the Swedish synchrotron

    CERN Multimedia

    Corinne Pralavorio

    2016-01-01

    CERN’s Vacuum, Surfaces and Coatings group has contributed to the development of vacuum chambers for the MAX IV synchrotron, which has just been officially opened in Sweden.   A section of the new 3 GeV MAX IV synchrotron at the time of installation. In the centre of the magnets you can see the vacuum chamber developed in collaboration with CERN. (Photo: Marek Grabski, MAX IV Vacuum group) On 21 June, the King and the Prime Minister of Sweden officially opened MAX IV, a brand-new synchrotron in Lund, Sweden. The summer solstice, the longest day of the year, was deliberately chosen for the ceremony: MAX IV, a cutting-edge synchrotron, will deliver the brightest X-rays ever produced to more than 2000 users. Some 1500 kilometres away, a team at CERN followed the opening ceremony with a touch of pride. The Vacuum, Surfaces and Coatings group in the Technology department (TE-VSC) participated in the construction of this new synchrotron. Its contribution lies at the very hea...

  20. Os meios multissensoriais da tecnologia de ensino na era da informática

    OpenAIRE

    Carvalho, Maria Luisa Campolina Costa

    2003-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-graduação em Engenharia de Produção Essa pesquisa avalia a questão do Ensino à Distância com relação à aprendizagem dos alunos da Universidade Federal de Santa Catarina. Realizou-se uma fundamentação teórica voltada para os aspectos fundamentais das práticas pedagógicas e a sua influência na tecnologia da educação, considerando a história do EaD. Na seqüência abordam-se os paradigmas educac...

  1. Projeto de um conversor analógico-digital para um receptor Bluetooth em tecnologia CMOS.

    OpenAIRE

    Wilmar Carvajal Ossa

    2010-01-01

    Neste trabalho aborda-se o projeto de um conversor analógico-digital (ADC) que deve atingir as especificações do padrão Bluetooth. Este bloco faz parte do estágio de recepção de um transceptor sem fio integrado em tecnologia CMOS. Inicialmente é feita a análise do ADC como sistema, ao mesmo tempo que as especificações nesse nível são desenvolvidas. A arquitetura adaptada da literatura é conhecida como time-interleaved pipeline. Os seus principais blocos, o S&H e o estágio básico incluindo o s...

  2. Entre Aparecer e Ser: tecnologia, espetáculo e subjetividade contemporânea

    Directory of Open Access Journals (Sweden)

    Fernanda Bruno

    2008-12-01

    Full Text Available O presente trabalho propõe-se a explorar a temática do espetáculo no interior das novas tecnologias de comunicação e de informação a partir das modalidades de visibilidade e de exposição da intimidade encenadas pelos dispositivos dos weblogs e das webcams na Internet. Ao subverterem os limites entre o público e o privado e entre natureza e artifício, tais dispositivos possibilitam problematizar a questão da produção de subjetividade na Atualidade, na sua relação com as transformações no estatuto do olhar do outro e no espetáculo.

  3. Tecnologias de dados abertos para interligar bibliotecas, arquivos e museus: um caso machadiano

    Directory of Open Access Journals (Sweden)

    Antonio Laurindo dos Santos Neto

    Full Text Available O artigo propõe um caso fictício para ilustrar o uso das tecnologias de Dados Abertos Interligados como mecanismos para tornar interoperáveis informações em acervos de bibliotecas, arquivos e museus, utilizando como exemplo as informações sobre o escritor Machado de Assis e sua obra. Utilizou-se como método o estudo de um caso restrito e ilustrativo, não exaustivo. Aplicaram-se diferentes vocabulários para interligação dos dados e para sua representação, utilizando os princípios do Linked Data; sugere-se que os profissionais da informação usufruam dessa potencialidade e busquem novas aplicações para ampliar a interoperabilidade dos dados disponíveis na Web.

  4. Open access

    NARCIS (Netherlands)

    Valkenburg, P.M.

    2015-01-01

    Open access week Van 19 tot en met 25 oktober 2015 vond wereldwijd de Open Access Week plaats. Tijdens deze week werden er over de hele wereld evenementen georganiseerd waar open access een rol speelt. Ook in Nederland zijn er diverse symposia, workshops en debatten georganiseerd zoals het debat in

  5. Bakelite chambers for time-of-flight measurements

    CERN Document Server

    Cwiok, M; Górski, M; Królikowski, J

    1999-01-01

    We report on the search of composite organic materials with the volume resistivity ranging from 10 sup 8 to 10 sup 1 sup 1 OMEGA cm. Materials having resistivity in this range may be used for electrodes of thin gap Parallel Plate Avalanche Chambers. Gas detectors of such structure and operated at increased gas pressure allow, potentially, a sub-nanosecond time resolution. Using bakelite-like material with electrical properties well tuned during manufacturing opens the possibility to overcome limitations related to the semi-conductive glass employed usually for ultrafast gas detectors of parallel plate structure for time-of-flight technique.

  6. Raymond J. Chambers--A Personal Reflection

    Science.gov (United States)

    Gaffikin, Michael

    2012-01-01

    This paper is presented as a tribute to Raymond J. Chambers. As its title suggests, it is a personal reflection through the eyes of someone who worked closely with him over a period of 10 years during a latter part of his career, and who completed a doctoral thesis with aspects of the work of Chambers as its subject. During this time, author…

  7. Results from the MAC Vertex chamber

    Energy Technology Data Exchange (ETDEWEB)

    Nelson, H.N.

    1987-05-01

    The design, construction, and performance characteristics of a high precision gaseous drift chamber made of thin walled proportional tubes are described. The device achieved an average spatial resolution of 45 ..mu..m in use for physics analysis with the MAC detector. The B-lifetime result obtained with this chamber is discussed.

  8. 21 CFR 866.2120 - Anaerobic chamber.

    Science.gov (United States)

    2010-04-01

    ... and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES IMMUNOLOGY AND MICROBIOLOGY DEVICES Microbiology Devices § 866.2120 Anaerobic chamber. (a) Identification. An anaerobic chamber is a device intended for medical purposes to maintain an anaerobic...

  9. An ionization chamber with magnetic levitated electrodes

    CERN Document Server

    Kawaguchi, T

    1999-01-01

    A new type of ionization chamber which has magnetically levitated electrodes has been developed. The electrodes are supplied voltages for the repelling of ions by a battery which is also levitated with the electrodes. The characteristics of this ionization chamber are investigated in this paper.

  10. ME1/1 Cathode Strip Chambers

    CERN Document Server

    Erchov, Yu V; Kamenev, Alexey; Karjavin, Vladimir; Khabarov, Serguei; Moissenz, P V; Moissenz, K P; Movchan, Sergey; Perelygin, Victor; Vassiliev, S E; Zarubin, Anatoli; Tchekhovski, V A

    2008-01-01

    The 76 innermost ME1/1 cathode strip chambers (CSC) of the CMS Experiment were designed and produced in Dubna. The chambers have been installed in the detector and commissioning has been completed. This paper describes the design of the CSCs, their main mechanical parameters and read-out electronics, and the results of tests with cosmic-ray muons.

  11. HVAC&R Equipment Environmental Chambers

    Data.gov (United States)

    Federal Laboratory Consortium — Description:Large "Truck" ChamberThe large "truck" chamber provides controlled air conditions from -7 °C (20 °F) to 65 °C (150 °F).Air-Conditioner and Heat Pump Test...

  12. Aging tests of full-scale CMS muon cathode strip chambers

    CERN Document Server

    Acosta, D; Arisaka, K; Bondar, N; Breedon, R; Bujak, A; Bylsma, B; Chester, N; Clare, R; Cline, D; Cousins, R; Cox, T; Dolinski, S I; Durkin, S; Eartly, D; Ivanov, Yu; Ferguson, T; Gavrilov, G; Gilmore, J; Gu, J; Gutay, L; Hann, F; Hartmut, R; Hauser, J; He, K; Ignatenko, M A; Ilie, S; Jiang, C; Ko, W; Korytov, A; Krivshich, A G; Kuznetsova, K; Layter, J; Lee, R; Levchenko, P M; Ling, T Y; Loveless, D; Lusin, S; Maeshima, K; Madorsky, A; Matthey, C; Matveev, M; Von der Mey, M; Mitselmakher, G; Otwinowski, S; Padley, P; Pal, I; Pischalnikov, Y; Prokofiev, O E; Razmyslovich, B V; Reeder, D; Roberts, J; Schipunov, L; Smirnov, I; Souvorov, V; Stasko, J T; Sun, H; Sytnik, V V; Terentyev, N K; Tripathi, M; Vavilov, S; Volkov, S; Vorobyov, A; Vorobyov, I A; Wang, L; Yarba, V A; Zhou, L; Zhu, Z

    2003-01-01

    Two CMS production Cathode Strip Chambers were tested for aging effects in a high-radiation environment at the Gamma Irradiation Facility at CERN. The chambers were irradiated over a large area: in total, about 2.1m**2 or 700m of wire in each chamber. The 40% Ar+50% CO//2+10% CF//4 gas mixture was provided by an open-loop gas system for one of the chambers and by a closed-loop re-circulating gas system for the other. After an accumulation of 0.3-0.4C/cm of a wire, equivalent to about 30-50 years of operation at peak LHC luminosity, no significant changes in gas gain, chamber efficiency and wire signal noise were observed for either of the two chambers. The only consistent signs of aging were a small increase in dark current from 2 to 10nA per plane of 600 wires and a decrease of strip-to-strip resistance from 1000 to 10-100GOmega. Disassembly of the chambers revealed deposits on the cathode planes, while the anode wires remained fairly clean.

  13. Determination of relative ion chamber calibration coefficients from depth-ionization measurements in clinical electron beams

    Science.gov (United States)

    Muir, B. R.; McEwen, M. R.; Rogers, D. W. O.

    2014-10-01

    A method is presented to obtain ion chamber calibration coefficients relative to secondary standard reference chambers in electron beams using depth-ionization measurements. Results are obtained as a function of depth and average electron energy at depth in 4, 8, 12 and 18 MeV electron beams from the NRC Elekta Precise linac. The PTW Roos, Scanditronix NACP-02, PTW Advanced Markus and NE 2571 ion chambers are investigated. The challenges and limitations of the method are discussed. The proposed method produces useful data at shallow depths. At depths past the reference depth, small shifts in positioning or drifts in the incident beam energy affect the results, thereby providing a built-in test of incident electron energy drifts and/or chamber set-up. Polarity corrections for ion chambers as a function of average electron energy at depth agree with literature data. The proposed method produces results consistent with those obtained using the conventional calibration procedure while gaining much more information about the behavior of the ion chamber with similar data acquisition time. Measurement uncertainties in calibration coefficients obtained with this method are estimated to be less than 0.5%. These results open up the possibility of using depth-ionization measurements to yield chamber ratios which may be suitable for primary standards-level dissemination.

  14. The SAMURAI Time Projection Chamber

    Science.gov (United States)

    Dye, Steven

    2011-10-01

    The SAMURAI Time Projection Chamber (TPC) will be used to study particle collisions by colliding a beam of particles with a stationary gas which will be contained in a field cage inside the TPC. When the beam collides with the gas, charged particles are accelerated into the pad plane by an electric field. The paths of these particles will be curved by a magnetic field created by the SAMURAI magnet at the RIKEN facility in Japan. The charged particles will then collide with the pad plane which will be located on the bottom of the TPC. The pad plane will take these collisions and create electrical signals and send them to supporting electronics where the data can be interpreted. The TPC will be used to help determine the Equation of State for asymmetric nuclear matter. Measurements of neutron, proton, 3H and 3He flow will be taken with the NEBULA array which consists of nebula scintillators. The poster will contain information on the laser calibration system and the electronics that will be used for the TPC. The electronics used are the same electronics used in the STAR TPC experiment.

  15. The CAST time projection chamber

    Science.gov (United States)

    Autiero, D.; Beltrán, B.; Carmona, J. M.; Cebrián, S.; Chesi, E.; Davenport, M.; Delattre, M.; Di Lella, L.; Formenti, F.; Irastorza, I. G.; Gómez, H.; Hasinoff, M.; Lakic, B.; Luzón, G.; Morales, J.; Musa, L.; Ortiz, A.; Placci, A.; Rodrigurez, A.; Ruz, J.; Villar, J. A.; Zioutas, K.

    2007-06-01

    One of the three x-ray detectors of the CERN Axion Solar Telescope (CAST) experiment searching for solar axions is a time projection chamber (TPC) with a multi-wire proportional counter (MWPC) as a readout structure. Its design has been optimized to provide high sensitivity to the detection of the low intensity x-ray signal expected in the CAST experiment. A low hardware threshold of 0.8 keV is set to a safe level during normal data taking periods, and the overall efficiency for the detection of photons coming from conversion of solar axions is 62%. Shielding has been installed around the detector, lowering the background level to 4.10 × 10-5 counts cm-2 s-1 keV-1 between 1 and 10 keV. During phase I of the CAST experiment the TPC has provided robust and stable operation, thus contributing with a competitive result to the overall CAST limit on axion photon coupling and mass.

  16. Commissioning of a large segmented ion chamber for the FMA

    Energy Technology Data Exchange (ETDEWEB)

    Lister, C.J.; Davids, C.N.; Blumenthal, D.J. [and others

    1995-08-01

    A large-area sectored ion chamber was built by a Yale-Daresbury (U.K.) - ANL collaboration to allow extensions of studies of N = Z (T = 0) nuclei. The ion chamber is a conventional DE-DE-E detector which is 20-cm deep, but each anode is segmented into eight pads to allow high count-rate capability and ray-trace reconstruction. With suitable electronics, the detector can become eight close-packed ion chambers, considerably reducing the count rate in each. A position-wire plane allows further raytracing which should permit the rejection of anomalous trajectories and improve Z-separation. A brief test run was scheduled shortly after delivery. Performance appeared promising, but issues of gain matching and cross talk need further exploration. We will study these features {open_quotes}off line{close_quotes} and hope to perform a full experiment on selenium isotopes in the summer. This detector appears to have many uses and is potentially more useful than previous detectors of its type. Similar detectors are being built for the HHRF at Oak Ridge and for Texas A&M University.

  17. Effect of primary iris and ciliary body cyst on anterior chamber angle in patients with shallow anterior chamber

    Institute of Scientific and Technical Information of China (English)

    Bing-hong WANG; Yu-feng YAO

    2012-01-01

    Objective:To evaluate the prevalence of primary iris and/or ciliary body cysts in eyes with shallow anterior chamber and their effect on the narrowing of the anterior chamber angle.Methods:Among the general physical check-up population,subjects with shallow anterior chambers,as judged by van Herick technique,were recruited for further investigation.Ultrasound biomicroscope (UBM) was used to detect and measure the cysts located in the iris and/or ciliary body,the anterior chamber depth (ACD),the angle opening distance at 500 μm (AOD500),and the trabecular-iris angle (TIA).A-scan ultrasonography was used to measure the ocular biometry,including lens thickness,axial length,lens/axial length factor (LAF),and relative lens position (RLP).The effect of the cyst on narrowing the corresponding anterior chamber angle and the entire angle was evaluated by the UBM images,ocular biometry,and gonioscopic grading.The eye with unilateral cyst was compared with the eye without the cyst for further analysis.Results:Among the 727 subjects with shallow anterior chamber,primary iris and ciliary body cysts were detected in 250 (34.4%) patients; among them 96 (38.4%) patients showed unilateral single cyst,21 (8.4%) patients had unilateral double cysts,and 42 (16.8%) patients manifested unilateral multiple and multi-quadrants cysts.Plateau iris configuration was found in 140 of 361 (38.8%) eyes with cysts.The mean size of total cysts was (0.6547±0.2319) mm.In evaluation of the effect of the cyst size and location on narrowing the corresponding angle to their position,the proportion of the cysts causing corresponding angle narrowing or closure among the cysts larger than 0.8 mm (113/121,93.4%) was found to be significantly higher than that of the cysts smaller than 0.8 mm (373/801,46.6%),and a significant higher proportion was also found in the cysts located at iridociliary sulcus (354/437,81.0%) than in that at the pars plicata (131/484,27.1%).In evaluating the effect

  18. Didactica de las ensenanzas artisticas impartidas en las Facultades de Educacion y Tecnologias de la informacion y la Comunicacion: la webquest como estrategia metodologica construccionista

    National Research Council Canada - National Science Library

    Salido-Lopez, Pedro Victorio; Maeso-Rubio, Francisco

    2014-01-01

    La sociedad actual se encuentra sumida en un proceso de cambio continuo que se ha visto favorecido, en gran parte, por los avances acaecidos en el mundo de las Tecnologias de la Informacion y la Comunicacion (TIC's...

  19. Agenda prospectiva estrategica de ciencia y tecnologia, una experiencia significativa en la planificacion y desarrollo institucional: caso Universidad de La Guajira

    National Research Council Canada - National Science Library

    Sierra Toncel, Wilmar; Ortiz Rojas, Angela Nair; Alvarado Mejia, Marelis Mercedes; Rangel Luquez, Olivia Isabel

    2013-01-01

    ... en Colombia, en la construccion de la Agenda Prospectiva de Ciencia y Tecnologia 2004-2014, concebida como un macro proyecto de investigacion para el desarrollo institucional en sus funciones basicas...

  20. VARIATION IN THE OPENINGS (OSTIA OF LEFT PULMONARY VEINS INTO THE LEFT ATRIUM: A CASE REPORT

    Directory of Open Access Journals (Sweden)

    Sesi

    2015-03-01

    Full Text Available During early embryonic development, absorption of pulmonary venous network by the left primitive atrial chamber results in opening of four pulmonary veins which drain independently into its chamber. The extent of absorption and hence, the number of pulmon ary veins which open into the left atrium, may vary. Here we report a variation in the opening of the Left upper (superior pulmonary vein into the Left atrium. A total of six openings observed

  1. Clinical efficacy of micro incision phacoemulsification and intraocular lens implantation in patients with shallow anterior chamber and cataract

    Directory of Open Access Journals (Sweden)

    Xue-Feng Pan

    2016-06-01

    Full Text Available AIM: To investigate the efficacy and safety of phacoemulsification combined with intraocular lens implantation in the treatment of shallow anterior chamber with cataract. METHODS: Retrospective case series. From February 2014 to July 2015 in our hospital,65 eyes in 65 patients with cataract were enrolled and divided into mild and high risk of shallow anterior chamber group. Best-corrected visual acuity(BCVA, intraocular pressure(IOP, central anterior chamber dept(CACD, angle opening distance(AOD, complications pre- and post treatment, were observed and analyzed as outcome measures. RESULTS:In this study, the mild shallow anterior chamber group included 34 eyes; postoperative BCVA were improved in 29 eyes, with 4 eyes remaining stable and decreased in 1 eye; BCVA was improved in 16 eyes, with 10 eyes remaining stable and decreased in 5 eyes in high risk of shallow anterior chamber group postoperatively. BCVA had a better prognosis in the mild shallow anterior chamber group than another group(t=-2.956, Pt=-5.02,-3.04; PF=203.75, PCONCLUSION: Micro incision cataract surgery is useful, effective and safe in patients with cataract and shallow anterior chamber which can stabilize or improve BCVA, reduce IOP, deepen CACD and open the anterior chamber angle.

  2. Rumo a uma adaptação contínua às tecnologias de informação: o papel da identidade organizacional empreendedora

    Directory of Open Access Journals (Sweden)

    Patricia j. Palma

    2010-09-01

    Full Text Available Da aplicação da perspectiva estruturalista ao campo das tecnologias da informação, a adaptação tecnológica passa a constituir um processo contínuo, que acompanha todo o ciclo de vida das tecnologias. No entanto, em alguns estudos, a adaptação continua a ter lugar num período limitado no tempo, terminando pouco tempo após a implantação das tecnologias. Atendendo à importância que o contexto organizacional pode apresentar na utilização das tecnologias, o presente artigo tem como objectivo estudar o papel da identidade organizacional empreendedora na reinvenção contínua das tecnologias da informação nas organizações. Por meio da partilha deuma identidade organizacional empreendedora os indivíduos desenvolvem uma atitude mais proactiva e antecipatória na utilização das tecnologias, o que conduz a reajustamentos contínuos da tecnologia, de encontro às necessidades dos utitizadores e da organização. Para a estimulação desta utilização empreendedora da tecnologia, o artigo avança com três factores essenciais ao desenvolvimento de uma identidade organizacional empreendedora: a liderança autêntica, a cultura de aprendizagem e o feedback dos grupos de interesse. O artigo termina com direcções para futuras investigações.

  3. SIAT: Information system of support to the administration of technology; SIAT: Sistema de informacion de apoyo a la administracion de la tecnologia

    Energy Technology Data Exchange (ETDEWEB)

    Molina Gonzalez, Ricardo; Herrera Lavin, Jesus; Rodriguez Ortiz, Guillermo [Instituto de Investigaciones Electricas, Temixco, Morelos (Mexico)

    1999-07-01

    A general introduction is made of the administration problem of the technology and a brief description of the process implemented in Petroleos Mexicanos (PEMEX) Exploration and Production (PEP) for the administration of the technology in PEP and the benefits that it provides. [Spanish] Se presenta una introduccion general del problema de administracion de la tecnologia y una breve descripcion del proceso implantado en Petroleos Mexicanos (Pemex) Exploracion y Produccion (PEP) para la administracion de las tecnologias en PEP y los beneficios que proporciona.

  4. Vitreous asteroid hyalosis prolapse into the anterior chamber simulating iris metastasis.

    Science.gov (United States)

    Shields, Carol L; Romanelli-Gobbi, Massi; Lally, Sara E; Shields, Jerry A

    2012-01-01

    Two asymptomatic elderly women who underwent cataract extraction 7 or more years previously and with intraocular lens placement presented with a linear bead-like white multinodular mass in the inferior angle simulating iris metastasis versus large inflammatory precipitates. There was no iris infiltration. In the first case, the posterior lens capsule was intact and there was no evidence of gelatinous vitreous in the anterior chamber, whereas in the second case, the capsule was open and there was gelatinous vitreous prolapse. In both cases, there was asteroid hyalosis in the vitreous. Both patients were diagnosed with prolapsed vitreous asteroid hyalosis into the anterior chamber and managed with observation. Vitreous asteroid hyalosis can prolapse into the anterior chamber of pseudophakic elderly patients with or without capsular opening and can simulate an intraocular tumor.

  5. Vitreous asteroid hyalosis prolapse into the anterior chamber simulating iris metastasis

    Directory of Open Access Journals (Sweden)

    Carol L Shields

    2012-01-01

    Full Text Available Two asymptomatic elderly women who underwent cataract extraction 7 or more years previously and with intraocular lens placement presented with a linear bead-like white multinodular mass in the inferior angle simulating iris metastasis versus large inflammatory precipitates. There was no iris infiltration. In the first case, the posterior lens capsule was intact and there was no evidence of gelatinous vitreous in the anterior chamber, whereas in the second case, the capsule was open and there was gelatinous vitreous prolapse. In both cases, there was asteroid hyalosis in the vitreous. Both patients were diagnosed with prolapsed vitreous asteroid hyalosis into the anterior chamber and managed with observation. Vitreous asteroid hyalosis can prolapse into the anterior chamber of pseudophakic elderly patients with or without capsular opening and can simulate an intraocular tumor.

  6. Quantum Simulation for Open-System Dynamics

    Science.gov (United States)

    Wang, Dong-Sheng; de Oliveira, Marcos Cesar; Berry, Dominic; Sanders, Barry

    2013-03-01

    Simulations are essential for predicting and explaining properties of physical and mathematical systems yet so far have been restricted to classical and closed quantum systems. Although forays have been made into open-system quantum simulation, the strict algorithmic aspect has not been explored yet is necessary to account fully for resource consumption to deliver bounded-error answers to computational questions. An open-system quantum simulator would encompass classical and closed-system simulation and also solve outstanding problems concerning, e.g. dynamical phase transitions in non-equilibrium systems, establishing long-range order via dissipation, verifying the simulatability of open-system dynamics on a quantum Turing machine. We construct an efficient autonomous algorithm for designing an efficient quantum circuit to simulate many-body open-system dynamics described by a local Hamiltonian plus decoherence due to separate baths for each particle. The execution time and number of gates for the quantum simulator both scale polynomially with the system size. DSW funded by USARO. MCO funded by AITF and Brazilian agencies CNPq and FAPESP through Instituto Nacional de Ciencia e Tecnologia-Informacao Quantica (INCT-IQ). DWB funded by ARC Future Fellowship (FT100100761). BCS funded by AITF, CIFAR, NSERC and USARO.

  7. Monitored Drift Chambers in the ATLAS Detector

    CERN Multimedia

    Herten, G

    Monitored Drift Chambers (MDT) are used in the ATLAS Detector to measure the momentum of high energy muons. They consist of drift tubes, which are filled with an Ar-CO2 gas mixture at 3 bar gas pressure. About 1200 drift chambers are required for ATLAS. They are up to 6 m long. Nevertheless the position of every wire needs to be known with a precision of 20 µm within a chamber. In addition, optical alignment sensors are required to measure the relative position of adjacent chambers with a precision of 30µm. This gigantic task seems impossible at first instance. Indeed it took many years of R&D to invent the right tools and methods before the first chamber could be built according to specifications. Today, at the time when 50% of the chambers have been produced, we are confident that the goal for ATLAS can be reached. The mechanical precision of the chambers could be verified with the x-ray tomograph at CERN. This ingenious device, developed for the MDT system, is able to measure the wire position insid...

  8. Chambered cuticle, pellicles, strange sensilla, and extraordinary muscle arrangements: a study of the micropterigid larval trunk (Lepidoptera: Micropterigidae).

    Science.gov (United States)

    Dupont, Steen T K

    2014-07-01

    The larvsal trunk wall of Sabatinca chalcophanes (Meyrick, 1885), representing the "sabatincoid morphotype," is described (brightfield and polarization microscopies, scanning and transmission electron microscopies). Eight sensillum types are identified, including four previously undescribed subventral and ventral kinds. The cuticle is nonsolid, the exocuticle being chambered in a honeycomb-like fashion with chamber walls apparently secreted along epidermal cells boundaries. The chamber contents open to the exterior via minute pores in the chamber roofs. A space between endo and exocuticle communicates with the chamber interiors via pores in the chamber floors; the dense endocuticular surface in places form thickened domes. On the lower trunk region, lateral chamber walls are highly porous (lattice like), hence their contents are continuous; individual chamber roofs here are markedly convex, and the external trunk surface, therefore, papillate. The trunk surface is more or less completely covered by a pellicle, likely formed by exudates from the exocuticular chambers. Unusually for Lepidoptera all trunk muscles are slender strands covering a modest proportion of the inner trunk surface. Conspicuous insertion "nodes" are located at lateral and ventral segmental boundaries, ventromedially near segmental midlengths, and paramedially on the dorsum behind segmental midlengths. Overall similar cuticular specializations are also present in the distantly related Micropterix, strongly supporting micropterigid monophyly. © 2014 Wiley Periodicals, Inc.

  9. A Bubble Chamber Simulator: A New Tool for the Physics Classroom

    Science.gov (United States)

    Gagnon, Michel

    2011-01-01

    Mainly used in the 1960s, bubble chambers played a major role in particle physics. Now replaced with modern electronic detectors, we believe they remain an important didactic tool to introduce particle physics as they provide visual, appealing and insightful pictures. Sadly, this rare type of detector is mostly accessible through open-door events…

  10. Conhecimento, tecnologia e sociedade: em busca de referências interpretativas da ação

    Directory of Open Access Journals (Sweden)

    Jairo Ferreira

    1999-08-01

    Full Text Available Este texto desenvolve pontos da relação entre sociedade, conhecimento e tecnologia com o recorte das teorias marxistas sobre produção social e educação, e a perspectiva sociogenética de Jean Piaget. A face oculta dessas teorias refere-se às polêmicas sobre as possibilidades cognitivas abertas pelas tecnologias de informática e telemática. Relativizando uma e outra abordagem, buscamos - nos vários passos de construção - as referências teóricas para a interpretação e avaliação daquelas relações, com os olhos voltados à ação pedagógica em ambientes informatizados, nos termos da oposição entre autonomia e heteronomia.

  11. Direito de morte e dever de vida: a mídia como canal de tecnologias políticas

    Directory of Open Access Journals (Sweden)

    Jeferson Bertolini

    2015-07-01

    Full Text Available http://dx.doi.org/10.5007/1806-5023.2015v12n1p64 Este artigo trata de duas tecnologias políticas descritas por Michel Foucault: o direito de causar a morte e o poder de causar a vida. O texto resgata dois temas tratados pelo autor (suplício e biopoder para discutir dois eventos em voga na mídia: o fuzilamento de traficantes na Indonésia (direito de causar a morte? e o avanço do noticiário em prol de uma vida saudável (poder de causar a vida?. O manuscrito conclui que a interação dessas tecnologias políticas promove uma espécie de habitus moderno, que produzir corpos politicamente dóceis e economicamente rentáveis.

  12. Tecnologia de estruturas EBG - electromagnetic band-gap - aplicada a antenas para comunicações moveis

    OpenAIRE

    Alexandre Manoel Pereira Alves da Silva

    2004-01-01

    Resumo: Este trabalho descreve a aplicação da tecnologia de estruturas EBG, Electromagnetic BandGap, em antenas para sistemas de comunicações móveis. Essa tecnologia pode ser adotada nos diversos sistemas de comunicações móveis de 3G e 4G; em ERBs (Estações Rádio-Base), picoERBs e terminais móveis; em padrões como WLAN, Wi-Fi, Bluetooth, WiMAX (IEEE802.16), entre outros. São projetadas, simuladas e analisadas, estruturas EBG com configurações de célu Ias quadradas e hexagonais, com um e dois ...

  13. Anodically bonded submicron microfluidic chambers.

    Science.gov (United States)

    Dimov, S; Bennett, R G; Córcoles, A; Levitin, L V; Ilic, B; Verbridge, S S; Saunders, J; Casey, A; Parpia, J M

    2010-01-01

    We demonstrate the use of anodic bonding to fabricate cells with characteristic size as large as 7 x 10 mm(2), with height of approximately 640 nm, and without any internal support structure. The cells were fabricated from Hoya SD-2 glass and silicon wafers, each with 3 mm thickness to maintain dimensional stability under internal pressure. Bonding was carried out at 350 degrees C and 450 V with an electrode structure that excluded the electric field from the open region. We detail fabrication and characterization steps and also discuss the design of the fill line for access to the cavity.

  14. Anodically bonded submicron microfluidic chambers

    Science.gov (United States)

    Dimov, S.; Bennett, R. G.; Córcoles, A.; Levitin, L. V.; Ilic, B.; Verbridge, S. S.; Saunders, J.; Casey, A.; Parpia, J. M.

    2010-01-01

    We demonstrate the use of anodic bonding to fabricate cells with characteristic size as large as 7×10 mm2, with height of ≈640 nm, and without any internal support structure. The cells were fabricated from Hoya SD-2 glass and silicon wafers, each with 3 mm thickness to maintain dimensional stability under internal pressure. Bonding was carried out at 350 °C and 450 V with an electrode structure that excluded the electric field from the open region. We detail fabrication and characterization steps and also discuss the design of the fill line for access to the cavity.

  15. Sample chambers with mother-daughter mode

    Energy Technology Data Exchange (ETDEWEB)

    Wilk, P.A.; Gregorich, K.E.; Hoffman, D.C.

    2001-07-12

    A set of eight stand-alone sample chambers with a common interface were constructed at LBNL for improved detection of alpha and fission decay chains over currently used designs. The stainless steel chambers (see Figure 1 for a schematic and Figure 2 for a photograph of a completed chamber) were constructed to allow for low background detection of a daughter event by removal of the sample following the detection of a parent event. This mother-daughter mode of operation has been utilized successfully with our Merry-go-Round (MG) detection system [Gregorich 1994].

  16. Radiation-induced foil electret chamber

    Science.gov (United States)

    Fallone, B. G.; Podgorsak, E. B.

    1983-10-01

    Saturation current densities, extrapolated electric fields, and electret-charging and -discharging current-density profiles in an ionization electret chamber are discussed as a function of various chamber parameters, such as air-gap and polymer thickness, polarizing electrode material, exposure rate, etc. Both the saturation current density and the extrapolated electric field consist of two components; one is linear with the air-gap thickness and is attributed to primary ionization in air, and the other exhibits exponential saturation and is attributed to air ionization caused by photoelectrons backscattered into the chamber sensitive volume from the polarizing electrode.

  17. Bubble chamber: Omega production and decay

    CERN Multimedia

    1973-01-01

    This image is of real particle tracks taken from the CERN 2 m liquid hydrogen bubble chamber and shows the production and decay of a negative omega particle. A negative kaon enters the chamber which decays into many particles, including a negative omega that travels a short distance before decaying into more particles. The invention of bubble chambers in 1952 revolutionized the field of particle physics, allowing real tracks left by particles to be seen and photographed by expanding liquid that had been heated to boiling point.

  18. A mathematical model of aerosol holding chambers

    DEFF Research Database (Denmark)

    Zak, M; Madsen, J; Berg, E

    1999-01-01

    in the chamber with time. Four different spacers were connected via filters to a mechanical lung model, and aerosol delivery during "breathing" was determined from drug recovery from the filters. The formula correctly predicted the delivery of budesonide aerosol from the AeroChamber (Trudell Medical, London......, Ontario, Canada), NebuChamber (Astra, Södirtälje, Sweden) and Nebuhaler (Astra) adapted for babies. The dose of fluticasone proportionate delivered by the Babyhaler (Glaxco Wellcome, Oxbridge, Middlesex, UK) was 80% of that predicted, probably because of incomplete priming of this spacer. Of the above...

  19. Weld Development for Aluminum Fission Chamber

    Energy Technology Data Exchange (ETDEWEB)

    Cross, Carl Edward [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Martinez, Jesse Norris [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2017-05-16

    The Sigma welding team was approached to help fabricate a small fission chamber (roughly ½ inch dia. x ½ inch tall cylinder). These chambers are used as radiation sensors that contain small traces of radionuclides (Cf 252, U 235, and U 238) that serve to ionize gas atoms in addition to external radiation. When a voltage is applied within the chamber, the resulting ion flow can be calibrated and monitored. Aluminum has the advantage of not forming radioactive compounds when exposed to high external radiation (except from minor Na alloy content). Since aluminum has not been used before in this application, this presented an unexplored challenge.

  20. APS Storage Ring vacuum chamber fabrication

    Energy Technology Data Exchange (ETDEWEB)

    Goeppner, G.A.

    1990-01-01

    The 1104-m circumference Advanced Photon Source Storage Ring Vacuum System is composed of 240 individual sections, which are fabricated from a combination of aluminum extrusions and machined components. The vacuum chambers will have 3800 weld joints, each subject to strict vacuum requirements, as well as a variety of related design criteria. The vacuum criteria and chamber design are reviewed, including a discussion of the weld joint geometries. The critical fabrication process parameters for meeting the design requirements are discussed. The experiences of the prototype chamber fabrication program are presented. Finally, the required facilities preparation for construction activity is briefly described. 6 refs., 6 figs., 1 tab.

  1. 30 CFR 77.305 - Access to drying chambers, hot gas inlet chambers and ductwork; installation and maintenance.

    Science.gov (United States)

    2010-07-01

    ... chambers and ductwork; installation and maintenance. 77.305 Section 77.305 Mineral Resources MINE SAFETY... drying chambers, hot gas inlet chambers and ductwork; installation and maintenance. Drying chambers, hot gas inlet chambers and all ductwork in which coal dust may accumulate shall be equipped with...

  2. As novas tecnologias como veículo de transmissão da informação financeira

    Directory of Open Access Journals (Sweden)

    Paula Alexandra Gomes da Silva

    2001-12-01

    Full Text Available Reconhecemos que as novas tecnologias da informação alteraram profundamente a sociedade actual. As alterações, de forma mais ou menos profundas, podem ser observadas em quase todas as áreas de actividade. A Contabilidade e a Auditoria não constituem excepções. A ausência de contornos definidos acerca destas tecnologias resulta em controvérsia que vem merecendo a atenção de diversos organismos reguladores e entidades normalizadoras nacionais e internacionais, bem como do mundo académico. Assumindo-se a forma, conteúdo, apresentação e segurança do relato financeiro como as principais fontes de discussão. Num ambiente de mudança, as profissões de contabilista e auditor têm de se adaptar às novas tecnologias, reposicionando-se, com o intuito de liderar os sistemas de informação financeira, pelo que a capacidade de lidar com as tecnologias consiste num requisito essencial à formação destes profissionais.Information technologies have deeply changed society way of life. Those changes can be observed in almost all activities. Accounting and Auditing are not an exception. The non-existence of clear boundaries on this issue is resulting on an increasing controversy. Thus, the way of delivering financial information has been calling several regulators and standard setting boards, as well as academics' attention. Content, presentation, and security are the key points of discussion. On this ever-changing environment, accounting and auditing professionals must continuously re-adjust to emerging technologies, in order to guarantee the financial information systems leadership. Therefore, skills and abilities to deal with those aspects are essential on these professionals education and must be developed.

  3. Tecnologia e a educação como desenvolvimento humano/Technology and education as human development

    Directory of Open Access Journals (Sweden)

    Renato Kraide Soffner

    2005-01-01

    Full Text Available Existe um novo relacionamento entre o homem e a informação disponível no mundo hoje – e a tecnologia tem um papel a desempenhar neste contexto. A educação pode ser beneficiária deste novo momento da história humana, se puder se valer das tecnologias de informação e comunicação, já disponíveis, para a concepção e implementação de um novo modelo pedagógico, que privilegia a conversão de informação em conhecimento, além de suportar o desenvolvimento de competências e de potencial humano. Entendidas assim, as tecnologias da inteligência (ou de apoio ao desenvolvimento cognitivo são, na verdade, tecnologias da aprendizagem. Os trabalhos pioneiros de Vannevar Bush em aparatos tecnológicos de tratamento da informação - associados a modelos de pensamento e cognição – e aprimorados pelos seus seguidores, serão os meios de realização de tal modelo inovador. There is something new in the relationship between man and the information that is available to him in the present world (last sixty years – and technology has had, and continues to have, a major and structuring role in bringing about and sustaining this new fact. Education may take advantage of this new phase of the human history, through the use of available information and communication technologies, providing a new pedagogical model that stresses the convertion of information into knowledge, developing competencies and human potential. From this point of view, such intelligence technologies are, in fact, learning technologies. The pioneer work of Vannevar Bush on technological devices for information treatment, improved by his followers, will be the basis for such model.

  4. Importance of the validation of saving technologies of electric power; Importancia de la validacion de tecnologias ahorradoras de energia electrica

    Energy Technology Data Exchange (ETDEWEB)

    Valer Negrete, Adrian [Programa de Ahorro de Energia del Sector Electrico (PAESE), Comision Federal de Electricidad (Mexico)

    2003-07-01

    Within the Programs of Energy Saving it is fundamental the search and application of new technologies, with which this saving can be obtained, selected with base in their technical characteristics that allow to reduce to the consumptions and demands of power, without damaging the electric networks nor the transformers of the Comision Federal de Electricidad. It is important that the investments which are made count on attractive periods of capital recovery, in comparison with the useful life of the product, reason why the knowledge and price of the new technologies will be parameters to consider in an important manner, creating the need of conducting tests that verify the veracity of the information of the supplier, resulting in certain cases, the change of design of these technologies, so that thus they fulfill the engaged characteristics. This paper indicates the characteristics that the new saving technologies of electrical energy must fulfill and the tests and parameters to consider their evaluation. [Spanish] Dentro de los Programas de Ahorro de Energia es fundamental la busqueda y aplicacion de nuevas tecnologias, con las que se pueda obtener dicho ahorro, seleccionadas con base en sus caracteristicas tecnicas que permitan reducir los consumos y demandas de potencia, sin danar las redes ni transformadores de la Comision Federal de Electricidad. Es importante que las inversiones que se realicen cuenten con periodos de recuperacion de capital atractivos, comparados con la vida util del producto, por lo que el conocimiento y precio de las nuevas tecnologias seran parametros a considerar de manera importante, creandose la necesidad de realizar pruebas que verifiquen la veracidad de la informacion del proveedor, resultando en determinados casos, el cambio de diseno de dichas tecnologias, para que asi cumplan las caracteristicas prometidas. Este trabajo indica las caracteristicas que deben cumplir las nuevas tecnologias ahorradoras de energia electrica y las

  5. Tecnologia educacional no contexto do ensino de histologia: pesquisa e desenvolvimento de um ambiente virtual de ensino e aprendizagem

    Directory of Open Access Journals (Sweden)

    José Guilherme Santa-Rosa

    Full Text Available Discutem-se as mudanças constatadas no ensino da Histologia, como a tecnologia tem sido empregada nos contextos de aprendizagem, os aspectos pedagógicos inerentes à utilização de recursos, tais como atlas digitais e microscópios virtuais, e apresenta-se pesquisa sobre o desenvolvimento de um ambiente virtual de ensino-aprendizagem de Histologia, que contou com a participação de alunos e professores em sua construção. Verificou-se que os ambientes virtuais e outros recursos didáticos baseados nas Tecnologias da Informação e da Comunicação (TICs procuram atender à atual tendência de complementar a educação presencial com ferramentas de educação a distância, que podem ser utilizadas facultativamente no estudo extraclasse continuado. Concluiu-se que, embora as novas tecnologias possam contribuir para o ensino de Histologia, os materiais didáticos baseados em TICs devem se adequar às expectativas docentes e discentes e aos aspectos pedagógicos e ergonômicos, e precisam ser adotados pelos professores não como ferramentas isoladas, mas integrados às estratégias de ensino-aprendizagem.

  6. Open hardware for open science

    CERN Multimedia

    CERN Bulletin

    2011-01-01

    Inspired by the open source software movement, the Open Hardware Repository was created to enable hardware developers to share the results of their R&D activities. The recently published CERN Open Hardware Licence offers the legal framework to support this knowledge and technology exchange.   Two years ago, a group of electronics designers led by Javier Serrano, a CERN engineer, working in experimental physics laboratories created the Open Hardware Repository (OHR). This project was initiated in order to facilitate the exchange of hardware designs across the community in line with the ideals of “open science”. The main objectives include avoiding duplication of effort by sharing results across different teams that might be working on the same need. “For hardware developers, the advantages of open hardware are numerous. For example, it is a great learning tool for technologies some developers would not otherwise master, and it avoids unnecessary work if someone ha...

  7. Tecnologia e "Morte Natural": o morrer na contemporaneidade Technology and "Natural Death": dying in contemporary society

    Directory of Open Access Journals (Sweden)

    Rachel Aisengart Menezes

    2003-12-01

    Full Text Available O desenvolvimento de técnicas voltadas ao prolongamento da vida acarretou mudanças significativas na concepção de morte. Este artigo analisa as representações contemporâneas da "morte natural" e sua relação com o uso de tecnologias médicas. Através de revisão bibliográfica, são examinadas as concepções de "morte natural" e de "morrer bem" construídas pelos diversos atores sociais envolvidos no processo do morrer. A literatura evidencia a construção contemporânea de um ideário e de uma trajetória necessários à realização do modelo da "boa morte". Esse modelo do "morrer bem" é construído em contraposição ao uso de técnicas para o prolongamento da vida. Estudos apontam a complexidade e ambivalência presentes no que seriam a morte natural ou não-natural, pois essas representações se encontram imbricadas com a concepção da "boa morte" como escolhida e produzida pelo doente. Deste modo, a tecnologia médica torna-se intrinsecamente constitutiva do "morrer natural".The development of techniques to prolong life has brought significant changes in the conceptualization of death. This article analyzes contemporary representations of "natural death" and their relationship to the use of medical technologies. Based on a literature review, the article examines the concepts of "natural death" and "dying well" constructed by the various social actors involved in the process of dying. The literature reveals the contemporary construction of a necessary set of ideals and pathway for achieving the model of a "good death". The "dying well" model is constructed in opposition to techniques for prolonging life. The studies point to the complexity and ambivalence of what is presented as "natural" versus "unnatural" death, since such representations are intertwined with the concept of a "good death" as that which is "chosen and produced" by the patient. Thus, medical technology becomes intrinsically constitutive for a "natural death".

  8. Tecnologia de áudio na etnomusicologia Audio Technology in Ethnomusicology

    Directory of Open Access Journals (Sweden)

    André Vieira Sonoda

    2010-01-01

    Full Text Available Estudo sobre a relação da etnomusicologia com a tecnologia de áudio adentrando nos principais desenvolvimentos tecnológicos e conceituais dessas duas áreas desde o final do século XIX. Objetiva resumir a história da primeira área, desde a musicologia sistemática até hoje com base na tecnologia que permeou seu percurso, chamando atenção para questões pouco contempladas. Foram subsídios metodológicos: a pesquisa bibliográfica e de campo, análises de documentos e comportamentos em estúdio de gravação e análises acústicas. Verificou-se a existência de marcos delineadores do processo histórico ocorrido. Sugere que qualquer fator relacionado com um processo de produção fonográfica pode influenciar o resultado acústico de uma manifestação musical gravada. Sugere também uma maior atenção em pesquisas frente à influência de elementos técnicos e conceituais de produção fonográfica em manifestações de transmissão oral.Study about the relation of the ethnomusicology with the audio technology covering the main technological and conceptual developments of these two areas since the late nineteenth century. It aims at covering the history of the former since the systematic musicology until the present centering on the technology that characterized the way, calling attention to less covered questions. The methodological procedures were: bibliographic and field research, document and behavior analysis in recording studio and acoustic analysis. It suggests the existence of some landmarks in the historical process and that any factor related with the phonographic production process may exert influence on the acoustic result of a recorded musical manifestation. It also calls attention to the need of more research on the influence of technical and conceptual elements of phonographic production on oral transmission manifestations.

  9. Conversação eletrônica em trabalhos de arte e tecnologia

    Directory of Open Access Journals (Sweden)

    Fábio Oliveira Nunes

    2013-12-01

    Full Text Available http://dx.doi.org/10.5007/1807-9288.2013v9n2p76 Este artigo propõe uma reflexão em torno das dinâmicas de conversação eletrônica presentes em trabalhos de arte e tecnologia. Estas produções possuem sistemas que respondem a sentenças de seus interlocutores com proposições inteligíveis, dentro da ideia de uma linguagem natural, imitando uma conversa entre humanos. Essa conversação pode ser por texto ou mesmo por voz, quando o sistema possui recursos de reconhecimento de fala. Quando fruídos estes trabalhos revelam um interessante fenômeno, chamado de “Efeito Eliza”: a tendência humana de antropomorfizar os dispositivos tecnológicos, lendo comportamentos e respostas como resultados de uma “emoção humana” ainda que estes sejam apenas resultados aleatórios, repetitivos ou mesmo vazios de sentido. A denominação remete ao programa Eliza, apresentado em 1966 pelo cientista da computação alemão Joseph Weizenbaum nos Estados Unidos, que viria a ser um dos programas de Inteligência Artificial mais conhecidos do mundo. Do ponto de vista técnico, alguns destes trabalhos se aproximam muito da engenharia dos chatbots – robôs de conversação – que atualmente são bastante comuns na rede Internet para fins educacionais, comerciais ou mesmo, de entretenimento, como um “amigo virtual”. Neste contexto, é apresentada uma suposta teleperformance, capitaneada por um “artista tecnológico” chamado Mimo Steim. Assim como outras incursões do gênero, a ação envolve o potencial relacional de sistemas de conversação eletrônica em trabalhos de arte e tecnologia.

  10. Cinema e feminismos entre poética e devir: por uma tecnologia engendrada

    Directory of Open Access Journals (Sweden)

    Fernanda Capibaribe Leite

    2015-12-01

    Full Text Available Esse artigo visa contribuir para a construção de uma poética feminista no cinema e audiovisual contemporâneo concebida na ideia de trânsito ou fluxos para sujeitos de gênero compreendidas/os fora da lógica dos binarismos “cis” e heteronormativos. Para tanto, atualiza a acepção em Lauretis (1987 de que o cinema se constitui como tecnologia de gênero, e aborda tal premissa no contexto das imagens tecnológicas e digitais através do conceito de percepto de devir feminista. Tal relação proposta engloba a ideia de que a poética feminista atualmente se alicerça cada vez mais na prerrogativa das experiências próprias de personagens subjetificadas/os, por um caminho patêmico no qual mulheres cis e trans não mais são colocadas sob o olhar do outro-homem-dominador, mas, ao contrário, se enunciam sob referências de seus próprios cotidianos e espaços de interlocução. Nesse sentido, a atualização da ideia de tecnologia de gênero para o cinema está ligada ao fato de que tais imagens configuram desterritorializações, devires, tanto no que toca a relação hegemonia-subalternidade no sistema sexo-gênero como no que se refere à própria ideia dos sujeitos legítimos e nomeados no feminismo. Como escopo investigativo, lanço um olhar sobre a produção Dude looks Like a Lady, parte da série de curtas em pornografia feminista intitulada XConfessions (LUST, 2013, 125min, oriundos de relatos em texto sobre fantasias e/ou experiências enviadas pela internet. Apesar de tratar de tal realização em particular, a trago também como espaço de acionamento de outras produções na perspectiva do feminismo, que endossam ou potencializam o lugar da diferença em produções com foco nos sujeitos engendrados.

  11. Open Access

    Science.gov (United States)

    Suber, Peter

    2012-01-01

    The Internet lets us share perfect copies of our work with a worldwide audience at virtually no cost. We take advantage of this revolutionary opportunity when we make our work "open access": digital, online, free of charge, and free of most copyright and licensing restrictions. Open access is made possible by the Internet and copyright-holder…

  12. Open Access

    Science.gov (United States)

    Suber, Peter

    2012-01-01

    The Internet lets us share perfect copies of our work with a worldwide audience at virtually no cost. We take advantage of this revolutionary opportunity when we make our work "open access": digital, online, free of charge, and free of most copyright and licensing restrictions. Open access is made possible by the Internet and copyright-holder…

  13. Evaluation of a novel reference chamber “stealth chamber” through Monte Carlo simulations and experimental data

    Directory of Open Access Journals (Sweden)

    Luis Vazquez Quino

    2015-01-01

    Full Text Available Purpose: To evaluate a novel reference chamber (Stealth Chamber by IBA through experimental data and Monte Carlo simulations for 6 and 15 MV photon energies. Methods: Monte Carlo simulations in a water phantom for field sizes ranging from 3×3 and 25×25 cm2 were performed for both energies with and without the Monte Carlo model of the Stealth Chamber in the beam path, and compared to commissioning beam data. Percent depth doses (PDDs, profiles, and gamma analysis of the simulations were performed along with an energy spectrum analysis of the phase-space files generated during the simulation. Experimental data were acquired in water with IBA three-dimensional (3D blue phantom in a set-up identical to the one used in the Monte Carlo simulations. PDD comparisons for fields ranging from 1×1 to 25×25 cm2 were performed for photon energies. Profile comparison for fields ranging from 1×1 to 25×25 cm2 were executed for the depths of dmax, 5, 10 and 20 cm. Criteria of 1%, 1 mm to compare PDDs and profiles were used. Transmission measurements with the Stealth Chamber and a Matrixx detector from IBA were investigated. Measurements for 6 and 15 MV with fields ranging from 3×3 to 25×25 cm2 dimensions were acquired in an open field with and without the Stealth Chamber in the path of the beam. Profiles and gamma analysis with a 1%, 1 mm gamma analysis criterion were performed. Results: Monte Carlo simulations of the PDDs and profiles demonstrate the agreement between both simulations. Furthermore, the gamma analysis (1%, 1 mm result of the comparison of both planes has 100% of the points passing the criteria. The spectral distribution analysis of the phase spaces for an open field with and without the chamber reveals the agreement between both simulations. Experimental measurements of PDDs and profiles have been conducted and reveal the comparability of relative dosimetric data acquired with the Stealth Chamber and our gold standard the CC13 chamber

  14. Developing cloud chambers with high school students

    CERN Document Server

    Ishizuka, Ryo; Sato, Shoma; Zeze, Syoji

    2013-01-01

    The result and outcome of the cloud chamber project, which aims to develop a cloud chamber useful for science education is reported in detail. A project includes both three high school students and a teacher as a part of Super Science High School (SSH) program in our school. We develop a dry ice free cloud chamber using salt and ice (or snow). Technical detail of the chamber is presented. We also argue how the project affects student's cognition, motivation, academic skills and behavior. The research project had been done in very similar way to those of professional researchers, i.e., planning research, applying fund, writing a paper and giving a talk in conferences. From interviews with students, we learn that such style of scientific activity is very effective in promoting student's motivation for learning science.

  15. RADAR Anechoic Chamber/RCS Measurements Lab

    Data.gov (United States)

    Federal Laboratory Consortium — The RF Anechoic Chamber is 56 feet long by 12 feet high by 13.5 feet wide, with an adjoining electronic computer control room. A double door entrance at one end of...

  16. High Performance Methane Thrust Chamber (HPMTC) Project

    Data.gov (United States)

    National Aeronautics and Space Administration — ORBITEC proposes to develop a High-Performance Methane Thrust Chamber (HPMRE) to meet the demands of advanced chemical propulsion systems for deep-space mission...

  17. Resistive plate chambers for tomography and radiography

    National Research Council Canada - National Science Library

    C. Thomay; P. Baesso; D. Cussans; J. Davies; P. Glaysher; S. Quillin; S. Robertson; C. Steer; C. Vassallo; J. Velthuis

    2012-01-01

    Resistive Plate Chambers (RPCs) are widely used in high energy physics for both tracking and triggering purposes, due to their excellent time resolution, rate capability, and good spatial resolution...

  18. MAN-IN-SIMULANT TEST (MIST) CHAMBER

    Data.gov (United States)

    Federal Laboratory Consortium — The MIST chamber uses methyl salicylate (oil of wintergreen) vapor as a simulant for HD agent to conduct system level evaluations of chemical protective ensembles....

  19. Aeroacoustic sound generation in simple expansion chambers.

    Science.gov (United States)

    English, Emmet J; Holland, Keith R

    2010-11-01

    A method is presented for measuring the aeroacoustic source strength in ducts with flow at frequencies at which the wave motion can be considered substantially one-dimensional. The method is based on coherent power flux measurements using pairs of microphones positioned both upstream and downstream of the source region. The method is applied to a flow excited expansion chamber with aeroacoustic source measurements presented for chambers with a range of flow velocities and chamber lengths. The results indicate locked-on flow tones are generated in the chamber. The frequency of these locked-on flow tones is compared with that predicted using describing function theory applied to resonators with a grazing flow as well as that of other literature.

  20. Developing Cloud Chambers with High School Students

    Science.gov (United States)

    Ishizuka, Ryo; Tan, Nobuaki; Sato, Shoma; Zeze, Syoji

    The result and outcome of the cloud chamber project, which aims to develop a cloud chamber useful for science education is reported in detail. A project includes both three high school students and a teacher as a part of Super Science High School (SSH) program in our school. We develop a dry-ice-free cloud chamber using salt and ice (or snow). Technical details of the chamber are described. We also argue how the project have affected student's cognition, motivation, academic skills and behavior. The research project has taken steps of professional researchers, i.e., in planning research, applying fund, writing a paper and giving a talk in conferences. From interviews with students, we have learnt that such style of scientific activity is very effective in promoting student's motivation for learning science.

  1. Using a ceramic chamber in kicker magnets

    Energy Technology Data Exchange (ETDEWEB)

    Kurennoy, S.

    1993-05-01

    A ceramic chamber inside kicker magnets can provide the relevant field risetime. On the other hand, some metallic coating inside has to prevent static charge buildup and shield the beam from ceramic and ferrite at high frequencies to avoid possible resonances. The issues concerning the metallized ceramic chamber, such as coupling impedances and requirements on the coating, are studied to find a compromise solution for kickers of the Medium Energy Booster at the Superconducting Super Collider.

  2. The Gargamelle heavy liquid bubble chamber

    CERN Multimedia

    1970-01-01

    This image shows the Gargamelle heavy liquid bubble chamber. It was used to detect particles in experiments at the PS between 1970 and 1976 before being moved to the SPS. In 1973, while working on the PS, it detected the first neutral current, an interaction vital to the electroweak theory. In 1978 a large fissure appeared in the body of the chamber and Gargamelle was stopped in 1979.

  3. The world's largest time projection chamber

    CERN Multimedia

    Maximilien Brice

    2006-01-01

    Peter Glassel, the technical coordinator for the ALICE time projection chamber, is seen sitting inside the detector; the largest in the world at nearly 100 cubic metres. Thousands of wires are connected to read out electronic data produced as particles are created in lead-lead collisions at the centre of the detector. These particles will cause the medium within the time projection chamber to ionise along their tracks allowing the particle paths to be recreated.

  4. Electrostatic fields in an ionization chamber electret

    Science.gov (United States)

    Fallone, B. G.; Podgorsak, E. B.

    1983-09-01

    The theory of linear systems is used to derive the potential and electric field in distance space in a cylindrical polarization/depolarization electret chamber. General solutions for the near, intermediate, and far regions are given and their domains of convergence discussed. On the axis of the chamber the solutions for the electret surface are equal to those obtained from Gauss's and Kirchoff's laws, and at large distances from the surface to those obtained from the introduction of a dipole layer model.

  5. Tracking with wire chambers at high luminosities

    Energy Technology Data Exchange (ETDEWEB)

    Hanson, G.G. (Indiana Univ., Bloomington, IN (USA) Stanford Linear Accelerator Center, Menlo Park, CA (USA))

    1989-12-01

    Radiation damage and rate limitations impose severe constraints on wire chambers at the SSC. Possible conceptual designs for wire chamber tracking systems that satisfy these constraints are discussed. Computer simulation studies of tracking in such systems are presented. Simulations of events from interesting physics at the SSC, including hits from minimum bias background events, are examined. Results of some preliminary pattern recognition studies are given. 11 refs., 10 figs.

  6. A model to forecast magma chamber rupture

    Science.gov (United States)

    Browning, John; Drymoni, Kyriaki; Gudmundsson, Agust

    2016-04-01

    An understanding of the amount of magma available to supply any given eruption is useful for determining the potential eruption magnitude and duration. Geodetic measurements and inversion techniques are often used to constrain volume changes within magma chambers, as well as constrain location and depth, but such models are incapable of calculating total magma storage. For example, during the 2012 unrest period at Santorini volcano, approximately 0.021 km3 of new magma entered a shallow chamber residing at around 4 km below the surface. This type of event is not unusual, and is in fact a necessary condition for the formation of a long-lived shallow chamber. The period of unrest ended without culminating in eruption, i.e the amount of magma which entered the chamber was insufficient to break the chamber and force magma further towards the surface. Using continuum-mechanics and fracture-mechanics principles, we present a model to calculate the amount of magma contained at shallow depth beneath active volcanoes. Here we discuss our model in the context of Santorini volcano, Greece. We demonstrate through structural analysis of dykes exposed within the Santorini caldera, previously published data on the volume of recent eruptions, and geodetic measurements of the 2011-2012 unrest period, that the measured 0.02% increase in volume of Santorini's shallow magma chamber was associated with magmatic excess pressure increase of around 1.1 MPa. This excess pressure was high enough to bring the chamber roof close to rupture and dyke injection. For volcanoes with known typical extrusion and intrusion (dyke) volumes, the new methodology presented here makes it possible to forecast the conditions for magma-chamber failure and dyke injection at any geodetically well-monitored volcano.

  7. Detection of particles with a cloud chamber

    OpenAIRE

    Esteban Muñoz, Iván

    2016-01-01

    Cloud chambers were essential devices in early nuclear and particle physics research. Superseded by more modern detectors in actual research, they still remain very interesting pedagogical apparatus. This thesis attempts to give a global view on this topic. To do so, a review of the physical foundations of the diffusion cloud chamber, in which an alcohol is supersaturated by cooling it with a thermal reservoir, is carried out. Its main results are then applied to analyse the working con...

  8. The drift chambers of the NOMAD experiment

    Energy Technology Data Exchange (ETDEWEB)

    Anfreville, M.; Astier, P.; Authier, M.; Baldisseri, A.; Banner, M.; Besson, N.; Bouchez, J.; Castera, A.; Cloue, O.; Dumarchez, J. E-mail: jacques.dumarchez@cern.ch; Dumps, L.; Gangler, E.; Gosset, J.; Hagner, C.; Jollec, C.; Lachaud, C.; Letessier-Selvon, A.; Levy, J.-M.; Linssen, L.; Meyer, J.-P.; Ouriet, J.-P.; Passerieux, J.-P.; Margaley, T.P.T. Pedrol; Placci, A.; Pluquet, A.; Poinsignon, J.; Popov, B.A.; Rathouit, P.; Schahmaneche, K.; Stolarczyk, T.; Uros, V.; Vannucci, F.; Vo, M.K.; Zaccone, H

    2002-04-01

    We present a detailed description of the drift chambers used as an active target and a tracking device in the NOMAD experiment at CERN. The main characteristics of these chambers are a large area (3{center_dot}3 m{sup 2}), a self-supporting structure made of light composite materials and a low cost. A spatial resolution of 150 {mu}m has been achieved with a single hit efficiency of 97%.

  9. In vitro penetration of bleaching agents into the pulp chamber

    DEFF Research Database (Denmark)

    Benetti, Ana Raquel; Valera, M C; Mancini, M N G

    2004-01-01

    To investigate pulp chamber penetration of bleaching agents in teeth following restorative procedures.......To investigate pulp chamber penetration of bleaching agents in teeth following restorative procedures....

  10. The GODDESS ionization chamber: developing robust windows

    Science.gov (United States)

    Blanchard, Rose; Baugher, Travis; Cizewski, Jolie; Pain, Steven; Ratkiewicz, Andrew; Goddess Collaboration

    2015-10-01

    Reaction studies of nuclei far from stability require high-efficiency arrays of detectors and the ability to identify beam-like particles, especially when the beam is a cocktail beam. The Gammasphere ORRUBA Dual Detectors for Experimental Structure Studies (GODDESS) is made up of the Oak Ridge-Rutgers University Barrel Array (ORRUBA) of silicon detectors for charged particles inside of the gamma-ray detector array Gammasphere. A high-rate ionization chamber is being developed to identify beam-like particles. Consisting of twenty-one alternating anode and cathode grids, the ionization chamber sits downstream of the target chamber and is used to measure the energy loss of recoiling ions. A critical component of the system is a thin and robust mylar window which serves to separate the gas-filled ionization chamber from the vacuum of the target chamber with minimal energy loss. After construction, windows were tested to assure that they would not break below the required pressure, causing harm to the wire grids. This presentation will summarize the status of the ionization chamber and the results of the first tests with beams. This work is supported in part by the U.S. Department of Energy and National Science Foundation.

  11. Expandable Purge Chambers Would Protect Cryogenic Fittings

    Science.gov (United States)

    Townsend, Ivan I., III

    2004-01-01

    Expandable ice-prevention and cleanliness-preservation (EIP-CP) chambers have been proposed to prevent the accumulation of ice or airborne particles on quick-disconnect (QD) fittings, or on ducts or tubes that contain cryogenic fluids. In the original application for which the EIP-CP chambers were conceived, there is a requirement to be able to disconnect and reconnect the QD fittings in rapid succession. If ice were to form on the fittings by condensation and freezing of airborne water vapor on the cold fitting surfaces, the ice could interfere with proper mating of the fittings, making it necessary to wait an unacceptably long time for the ice to thaw before attempting reconnection. By keeping water vapor away from the cold fitting surfaces, the EIP-CP chambers would prevent accumulation of ice, preserving the ability to reconnect as soon as required. Basically, the role of an EIP-CP chamber would be to serve as an enclosure for a flow of dry nitrogen gas that would keep ambient air away from QD cryogenic fittings. An EIP-CP chamber would be an inflatable device made of a fabriclike material. The chamber would be attached to an umbilical plate holding a cryogenic QD fitting.

  12. Temperature Studies for ATLAS MDT BOS Chambers

    CERN Document Server

    Engl, A; Hertenberger, R; Mameghani, R; Merkl, D; Rauscher, F; Schaile, A D; Ströhmer, R

    2009-01-01

    Data sets with high statistics taken at the cosmic ray facility, equipped with 3 ATLAS BOS MDT chambers, in Garching (Munich) have been used to study temperature and pressure effects on gas gain and drifttime. The deformation of a thermally expanded chamber was reconstructed using the internal RasNik alignment monitoring system and the tracks from cosmic data. For these studies a heating system was designed to increase the temperature of the middle chamber by up to 20 Kelvins over room temperature. For comparison the temperature effects on gas properties have been simulated with Garfield. The maximum drifttime decreased under temperature raise by -2.21 +- 0.08 ns/K, in agreement with the results of pressure variations and the Garfield simulation. The increased temperatures led to a linear increase of the gas gain of about 2.1% 1/K. The chamber deformation has been analyzed with the help of reconstructed tracks. By the comparison of the tracks through the reference chambers with these through the test chamber ...

  13. Open Source and Open Standards

    NARCIS (Netherlands)

    Koper, Rob

    2006-01-01

    Publication reference: Koper, R. (2008). Open Source and Open Standards. In J. M. Spector, M. Merrill, J. van Merriënboer & M. P. Driscol (Eds.), Handbook of Research on Educational Communications and Technology (3rd ed., pp. 355-368). New York: Routledge.

  14. Measurements of a 1/4-scale model of an explosives firing chamber

    Energy Technology Data Exchange (ETDEWEB)

    Pastrnak, J.W.; Baker, C.F.; Simmons, L.F.

    1995-01-27

    In anticipation of increasingly stringent environmental regulations, Lawrence Livermore National Laboratory (LLNL) proposes to construct a 60-kg firing chamber to provide blast-effects containment for most of its open-air, high-explosive, firing operations. Even though these operations are within current environmental limits, containment of the blast effects and hazardous debris will further drastically reduce emissions to the environment and minimize the generated hazardous waste. The major design consideration of such a chamber is its overall structural dynamic response in terms of long-term containment of all blast effects from repeated internal detonations of high explosives. Another concern is how much other portions of the facility outside the firing chamber must be hardened to ensure personnel protection in the event of an accidental detonation while the chamber door is open. To assess these concerns, a 1/4-scale replica model of the planned contained firing chamber was designed, constructed, and tested with scaled explosive charges ranging from 25 to 125% of the operational explosives limit of 60 kg. From 16 detonations of high explosives, 880 resulting strains, blast pressures, and temperatures within the model were measured to provide information for the final design. Factors of safety for dynamic yield of the firing chamber structure were calculated and compared to the design criterion of totally elastic response. The rectangular, reinforced-concrete chamber model exhibited a lightly damped vibrational response that placed the structure in alternating cycles of tension and compression. During compression, both the reinforcing steel and the concrete remained elastic.

  15. Tecnologia da informação em nefrologia Information technology applied to nephrology

    Directory of Open Access Journals (Sweden)

    Marcos Vinícius Ribeiro dos Santos

    2009-09-01

    Full Text Available Este artigo apresenta uma revisão da literatura sobre as aplicações da tecnologia da informação em Nefrologia. Caracterizamos as aplicações em bancos de dados, as iniciativas mais voltadas ao ensino e alguns exemplos de sistemas de apoio à decisão. Por fim, apresentamos as experiências de Telemedicina em Nefrologia nitidamente voltadas ao suporte prestado à assistência dialítica a distância. Enfatizamos que a telessaúde pode ajudar na criação de um modelo assistencial descentralizado, voltado à prevenção, centrado na atenção básica como forma de combater a epidemia mundial de Doença Renal Crônica (DRC.This is a review of the literature about the applications of information technology in nephrology. The use of information technology for database, teaching, and decision support systems is discussed. The application of telemedicine in nephrology to assist dialysis performed in remote regions is also presented. Telemedicine can have a key role in increasing standards of care in nephrology. In conclusion, telemedicine may help to build a decentralized assistance model for prevention, focused on primary care, and, thus, may play an important role in the fight against the worldwide epidemic of chronic kidney disease (CKD.

  16. Criança dependente de tecnologia: a experiência do cuidado materno

    Directory of Open Access Journals (Sweden)

    Aline Cristiane Cavicchioli Okido

    2012-10-01

    Full Text Available Este estudo tem como objetivo compreender a experiência materna no cuidado ao filho dependente de tecnologia. Utilizamos a abordagem do estudo de caso etnográfico tendo como instrumentos de coleta de dados os genograma e ecomapa, entrevista aberta e observação. Os dados foram organizados em três unidades de significados: a busca pelas causas e por culpados; a alta hospitalar e as demandas para o cuidado e as redes de apoio. O estudo permitiu conhecer a experiência materna em busca por explicações, bem como os sentimentos de desconfiança, insegurança e insatisfação relacionados ao serviço de saúde. Ainda a apropriação da mãe em relação aos cuidados à criança e no que se refere à organização do ambiente domiciliar para recebê-la, a utilização das redes de apoio, destacando a carência de vínculos com familiares e vizinhos e a busca formal e informal para garantir a subsistência da criança doente e dos demais filhos.

  17. A INFLUÊNCIA DA TECNOLOGIA E DA INTERNET NO MARKETING

    Directory of Open Access Journals (Sweden)

    Lúcia Cristina Vargas Machado

    2014-09-01

    Full Text Available O dinamismo do mundo globalizado vem exigindo grandes mudanças das organizações, sejam para aquelas que produzem bens tangíveis, sejam para as prestadoras de serviços. E dentro da observância das mudanças, pode-se considerar as revoluções vividas pela humanidade, considerando aquela que mais mudou o cenário mercadológico pela primeira vez que foi 1ª revolução industrial e, a outra, a revolução da informação. Neste contexto, o objetivo deste trabalho é demonstrar através da revisão de literatura, a significativa e importante transformação da informação para a área de marketing das organizações. A revolução da informação, tendo como suas precursoras e legítimas aliadas a tecnologia e a internet, respectivamente, fez com que surgisse um novo tipo de marketing: o marketing digital. Com este novo tipo de marketing, as organizações que estiverem mais presentes na internet, poderão obter uma maior vantagem competitiva e como consequência uma maior lucratividade

  18. A nova convergência da ciência e da tecnologia

    Directory of Open Access Journals (Sweden)

    Esper A. Cavalheiro

    2007-07-01

    Full Text Available A ação sinérgica dos quatro campos científicos e tecnológicos que apresentaram crescimento acelerado nas últimas décadas - nanotecnologia, biotecnologia, tecnologias de comunicação e informação e ciências cognitivas (neurociência - tem sido intitulada Convergência Tecnológica. Este artigo faz uma revisão das principais discussões que vêm ocorrendo na comunidade científica internacional sobre o seu desenvolvimento e assinala a necessidade de uma abordagem mais ampla que inclua as ciências humanas e sociais e outros atores relevantes na sociedade contemporânea.The synergic combination of the scientific and technological fields that presented a rapid growth rate in the last few decades - nanotechnology, biotechnology, information and communication technologies, and cognitive science including neuroscience - is nowadays known as Convergent Technologies. This paper reviews its recent impact on the international scientific community and points out the need of amplifying the discussions to include humanities and social sciences and other important actors of contemporary society.

  19. Voce ja comeu DNA hoje? Divulgacao cientifica durante a Semana da Ciencia e Tecnologia no Brasil

    Directory of Open Access Journals (Sweden)

    Patricia Abrao Possik

    2013-11-01

    Full Text Available Durante a Primeira Semana Nacional de Ciências e Tecnologia, em 2004, centros e museus de ciência, universidades e escolas implementaram atividades com o objetivo de divulgar ciência para a população. O DNA Vai à Escola se juntou ao Conselho de Informação e Biotecnologia e praticou a extração de DNA de frutas em supermercados de 11 cidades brasileiras. Este artigo descreve a formação da rede nacional de pessoas interessadas em transmitir informações sobre genética para o público leigo e a implementação de uma atividade de divulgação científica de baixo orçamento em vários pontos do país, simultaneamente. Apresenta ainda o impacto causado pela atividade e as percepções daqueles envolvidos na sua organização.

  20. NOVAS TECNOLOGIAS E APRENDIZAGEM DE LÍNGUA INGLESA: POTENCIALIDADES NUM AMBIENTE COMPLEXO

    Directory of Open Access Journals (Sweden)

    Dulci Marlise Boettcher

    2011-07-01

    Full Text Available Este artigo objetiva compreender o fenômeno técnico na sua complexidade, discutindo-o a partir de outras perspectivas que contribuam para uma mais educação que considere as necessidades individuais dos seres humanos, levando em conta a utilização de um Ambiente Virtual de Aprendizagem como ferramenta de trabalho e espaço virtual de convivência. Para tanto, são considerados como princípios norteadores, a teoria da Biologia da Cognição de Humberto Maturana e Francisco Varela, os estudos sobre tecnologia de Pierre Levy, bem como os pressupostos sobre complexidade de Edgar Morin. A Internet, considerando suas características como a recursividade, interação e autonomia, possibilita a construção do aprendizado, e mais especificamente do aprendizado da língua inglesa. Esse ambiente complexo serve, dessa forma, como importante instrumento de potencialização do conhecimento/subjetividade, mostrando resultados importantes na aprendizagem dessa língua, por enfatizar o estar junto virtual e estabelecer novas relações com o saber que oportuniza a construção do conhecimento e de novos cenários mundiais. Palavras-chave: Espaço digital-Construção do Conhecimento-Complexidade-Virtualidade - Língua Inglesa.

  1. UTILIZAÇÃO DE TECNOLOGIAS EDUCATIVAS COM ADOLESCENTES ONCOLÓGICOS: UMA ABORDAGEM FREIREANA

    Directory of Open Access Journals (Sweden)

    Camila Brasil Moreira

    2012-01-01

    Full Text Available El objetivo fue describir el uso de tecnologias educativas a través de la realización de actividades de educación en salud basada en el referencial teórico-metodológico de Paulo Freire. Estudio transversal, cualitativo que decribe experiência realizada en Instituto de Referencia en Tratamiento del Cáncer de niños y adolescentes, en mayo de 2011, como actividad de prácticas de la disciplina Enfermería en el Proceso de Cuidar de Adolescentes, ofrecida en el quinto semestre de Enfermería de la Universidad Federal del CearáUFC. Los relatos fueron descriptos en orden cronológica de las actividades, donde se abordaron los temas: higiene personal, autoimagen y concepto de salud. En el grupo de adolescentes, se observó mayor valorización e interés en los temas cuando presentados de manera lúdica y dinámica, trabajados interactiva e informativamente.

  2. Novas tecnologias reprodutivas: doação de óvulos. O que pode ser novo nesse campo? New reproductive technologies: oocyte donation. What could be new in this field?

    Directory of Open Access Journals (Sweden)

    Marilena V. Corrêa

    2000-09-01

    Full Text Available Este artigo discute as "novas" tecnologias reprodutivas. Através da interrogação dessa adjetivação, são analisadas estratégias e contradições que mantêm como novo esse conjunto de técnicas e experiências médicas iniciadas há mais de duas décadas e que encontraram ampla difusão no mercado de serviço médicos. A presença, na mídia, da temática dos bebês de proveta e, sobretudo, de seus desdobramentos em termos da intervenção sobre células germinativas e sobre embriões humanos, ajuda a conferir o caráter de permanente novidade a tudo o que cerca as tecnologias reprodutivas e as intervenções genéticas por ela possibilitadas. Apesar de, sem dúvida, encontrarmo-nos diante de um processo aberto e em plena inovação, os efeitos sociais e simbólicos no plano da maternidade, paternidade e filiação são ainda pouco sentidos e discutidos. Para ilustrar tais contradições é focalizado o caso da doação de óvulos. Este evidencia a necessidade de serem buscadas novas perspectivas em termos do controle social da difusão das tecnologias reprodutivas entre nós.This article discusses the so-called "new" reproductive technologies. The author analyzes and challenges this adjective, since for over two decades this group of medical techniques and experiments has been widely disseminated in the medical market. The media's coverage of test tube babies, and especially developments in intervention on human germ cells and embryos, help challenge the supposed permanent novelty of everything surrounding reproductive technologies and genetic interventions. Society is doubtless experiencing an open process in full innovation, but the social and symbolic effects on planning maternity, paternity, and filiation are still not well perceived or discussed. To illustrate such contradictions, the article focuses on the case of oocyte donation, highlighting the need for new perspectives in terms of social control over the dissemination of

  3. Personnel from Chambers of Commerce of Latin-American & Caribbean Countries Trained in China for the First Time

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    @@ On December 4, the First Training Seminar for Personnel from Chambers of Commerce of Latin-American & Caribbean Countries, held by the Ministry of Commerce and CCPIT (China Council for the Promotion of International Trade), held the opening ceremony in Beijing.Over 20 leaders of Chambers of Commerce from 12 countries such as Grenada, Ecuador, Haiti, Uruguay, Brazil, Saint Lucia,Guatemala, Costa Rica, Peru, Panama, Nigeria, etc., attended this training.

  4. How well do you know your growth chambers? Testing for chamber effect using plant traits

    National Research Council Canada - National Science Library

    Porter, Amanda S; Evans-Fitz Gerald, Christiana; McElwain, Jennifer C; Yiotis, Charilaos; Elliott-Kingston, Caroline

    2015-01-01

    .... A range of techniques were used to measure differences between chamber plants, including chlorophyll fluorescence measurements, gas exchange analysis, biomass, reproductive yield, anatomical traits...

  5. Open IS

    DEFF Research Database (Denmark)

    Germonprez, Matt; Crowston, Kevin; Avital, Michel

    2013-01-01

    The collective intelligence and collective action of “open” communities have produced a variety of complex knowledge goods and radical social change. The Information Systems (IS) community has invested significant effort into researching open communities and the ecosystems in which they operate...... therefore seeks to stimulate a thoughtful and dynamic discussion around the proposition that becoming a more open community will enhance the IS discipline’s scholarly inquiry and global impact....

  6. Open IS

    DEFF Research Database (Denmark)

    Germonprez, Matt; Crowston, Kevin; Avital, Michel

    2013-01-01

    The collective intelligence and collective action of “open” communities have produced a variety of complex knowledge goods and radical social change. The Information Systems (IS) community has invested significant effort into researching open communities and the ecosystems in which they operate...... therefore seeks to stimulate a thoughtful and dynamic discussion around the proposition that becoming a more open community will enhance the IS discipline’s scholarly inquiry and global impact....

  7. Final report for NIF chamber dynamics studies

    Energy Technology Data Exchange (ETDEWEB)

    Burnham, A; Peterson, P F; Scott, J M

    1998-09-01

    The National Ignition Facility (NIF), a 1.8 MJ, 192 laser beam facility, will have anticipated fusion yields of up to 20 MJ from D-T pellets encased in a gold hohlraum target. The energy emitted from the target in the form of x rays, neutrons, target debris kinetic energy, and target shrapnel will be contained in a 5 m. radius spherical target chamber. various diagnostics will be stationed around the target at varying distances from the target. During each shot, the target will emit x rays that will vaporize nearby target facing surfaces including those of the diagnostics, the target positioner, and other chamber structures. This ablated vapor will be transported throughout the chamber, and will eventually condense and deposit on surfaces in the chamber, including the final optics debris shields. The research at the University of California at Berkeley relates primarily to the NIF chamber dynamics. The key design issues are the ablation of the chamber structures, transport of the vapor through the chamber and the condensation or deposition processes of those vaporized materials. An understanding of these processes is essential in developing a concept for protecting the fina optics debris shields from an excessive coating (> 10 A) of target debris and ablated material, thereby prolonging their lifetime between change-outs. At Berkeley, we have studied the physical issues of the ablation process and the effects of varying materials, the condensation process of the vaporized material, and design schemes that can lower the threat posed to the debris shields by these processes. The work or portions of the work completed this year have been published in several papers and a dissertation [l-5].

  8. The Clinical Analysis of Secondary Glaucoma Following Posterior Chamber Intraocular Lens Implantation

    Institute of Scientific and Technical Information of China (English)

    1994-01-01

    We present 14 patients with secondary gluacoma following the implantation of a posterior chamber intraocular lens (lOLs). All patients were u-nilateral gluacoma , which developed within 1 month following the IOL implantation in 10 cases, and from 1 to 3 years in 4 cases. The angle of anterior chamber was open in 8 patients, and close in 6 ones. Seven patients required treatment of antiglaucomatous medicine; 4 patients underwent laser indecto-my and 3 patients required antiglaucoma surgery. The results s...

  9. Investigation of Swirling Flows in Mixing Chambers

    Directory of Open Access Journals (Sweden)

    Jyh Jian Chen

    2011-01-01

    Full Text Available This investigation analyzed the three-dimensional momentum and mass transfer characteristics arising from multiple inlets and a single outlet in micromixing chamber. The chamber consists of a right square prism, an octagonal prism, or a cylinder. Numerical results which were presented in terms of velocity vector plots and concentration distributions indicated that the swirling flows inside the chamber dominate the mixing index. Particle trajectories were utilized to demonstrate the rotational and extensional local flows which produce steady stirring, and the configuration of colored particles at the outlet section expressed at different Re represented the mixing performance qualitatively. The combination of the Taylor dispersion and the vorticity was first introduced and made the mixing successful. The effects of various geometric parameters and Reynolds numbers on the mixing characteristics were investigated. An optimal design of the cylindrical chamber with 4 inlets can be found. At larger Reynolds number, Re>15, more inertia caused the powerful swirling flows in the chamber, and more damping effect on diffusion was diminished, which then increased the mixing performance.

  10. Improved climatic chamber for desiccation simulation

    Directory of Open Access Journals (Sweden)

    Lozada Catalina

    2016-01-01

    Full Text Available The climatic chamber at the Universidad de Los Andes was improved for modeling desiccation in soil layers. This chamber allows the measurement of different environmental variables. In this research, evaporation tests were conducted in water imposing boundary conditions for drying, and then these tests were performed in a soil layer. The soil was prepared from a slurry state and was drying controlling the temperature, the infrared radiation, the wind velocity, and the relative humidity. In the first part of this paper, a description of the climatic chamber, operation ranges and theoretical work principles of the climatic chamber are presented. Then, the second part shows the results for desiccation in water and soil. The desiccation tests performed with the climatic chamber allow simulating all environmental conditions accurately during drying coupling the effect of all environmental variables. As a result, the evaporation rate increases with infrared radiation in soil and water. The rate at the beginning of the desiccation tests in clays is the same as in water. However, this evaporation rate decreases as the soil becomes desiccated.

  11. Tuned Chamber Core Panel Acoustic Test Results

    Science.gov (United States)

    Schiller, Noah H.; Allen, Albert R.

    2016-01-01

    This report documents acoustic testing of tuned chamber core panels, which can be used to supplement the low-frequency performance of conventional acoustic treatment. The tuned chamber core concept incorporates low-frequency noise control directly within the primary structure and is applicable to sandwich constructions with a directional core, including corrugated-, truss-, and fluted-core designs. These types of sandwich structures have long, hollow channels (or chambers) in the core. By adding small holes through one of the facesheets, the hollow chambers can be utilized as an array of low-frequency acoustic resonators. These resonators can then be used to attenuate low-frequency noise (below 400 Hz) inside a vehicle compartment without increasing the weight or size of the structure. The results of this test program demonstrate that the tuned chamber core concept is effective when used in isolation or combined with acoustic foam treatments. Specifically, an array of acoustic resonators integrated within the core of the panels was shown to improve both the low-frequency absorption and transmission loss of the structure in targeted one-third octave bands.

  12. Tecnologia na Educação: a aprendizagem da Língua Inglesa por meio da rede social LiveMocha

    Directory of Open Access Journals (Sweden)

    Neide Aparecida Arruda de Oliveira

    2013-01-01

    Full Text Available O objetivo deste artigo é promover uma reflexão sobre os processos de ensino e aprendizagem em meio virtual com auxílio das novas tecnologias em uma comunidade virtual conhecida como Livemocha. Trata-se de um ambiente virtual que busca promover a aprendizagem de idiomas de forma colaborativa, uma vez que o aprendiz de língua estrangeira no Livemocha também passa a ser professor de sua língua materna. A aplicação de novas tecnologias na educação vem modificando o panorama do sistema educacional e, por isso, pode-se falar de um tipo de aula antes e depois da difusão de mídias integradas e tecnologias avançadas de comunicação digital. Os resultados das aplicações de tais tecnologias estão criando condições objetivas para questionarem a real necessidade de se preparar para o ensino virtual. Na era da tecnologia, da Internet, das redes sociais, a aprendizagem de idiomas se remodela e modela a atividade do aluno. Cada vez mais, surgem mobilizações virtuais em busca de conhecimentos. Um fator relevante para manter o aluno envolvido na sua aprendizagem por conta dos sistemas mochapoints e outros recursos e estratégias disponibilizadas no Livemocha.

  13. Implicações das tecnologias e da organização escolar no aprender matemática: o olhar do professor

    Directory of Open Access Journals (Sweden)

    Aline Cardoso de Oliveira Macedo

    2017-05-01

    Full Text Available Para grande parte dos alunos do Ensino Médio, utilizar as várias tecnologias existentes não é desafio. O desafio consiste na escolha das tecnologias que eles empregam para o aprender. Para tentar compreender essas escolhas, trazemos o presente artigo que analisa os discursos, organizados a partir de entrevistas semiestruturadas, feitas com professores de Matemática de um Instituto Federal. As perguntas versaram sobre a percepção do comprometimento de seus alunos com a sua própria aprendizagem e as tecnologias escolhidas no aprender. Para organizar as discursividades, escolhemos a técnica Discurso do Sujeito Coletivo, proposta por Fernando Lefèvre e Ana Maria Lefèvre. Ao analisarmos esses discursos, com o aporte teórico da Biologia do Conhecer desenvolvida por Humberto Maturana e Francisco Varela, compreendemos que o professor está procurando maneiras diferentes para trabalhar, visando atender às necessidades dos seus alunos, pois trabalhar pedagogicamente com a tecnologia requer apropriação da mesma. Percebemos que o comprometimento de alunos e professores é ponto de partida para que se ampliem as possibilidades de cooperação e de significados do próprio aprender Matemática. É em um ambiente cooperativo que, professores e alunos, poderão conviver e encontrar as tecnologias que mediarão esse aprender.

  14. A FORMAÇÃO INICIAL DO PROFESSOR PARA O USO DAS TECNOLOGIAS DE COMUNICAÇÃO E INFORMAÇÃO

    Directory of Open Access Journals (Sweden)

    Aleksandre Saraiva Dantas

    2007-12-01

    Full Text Available Este artigo fala sobre a problemática que envolve a formação inicial do professor para o uso das tecnologias de comunicação e informação. Mostra que as transformações que vêm ocorrendo nos diversos campos da sociedade, aliadas ao desenvolvimento tecnológico e o conseqüente aumento da competitividade por um lugar no mercado de trabalho, passam a exigir novas posturas, tanto da escola, quanto do professor, destacando a necessidade de incorporar à sua prática educativa, os avanços tecnológicos nas áreas de comunicação e informação. Destaca algumas deficiências apresentadas pelos professores no uso destas tecnologias, como também os motivos que os levam a apresentar tais limitações. Por último, mostra algumas dificuldades apresentadas pelas universidades no processo de formação dos professores para o uso das tecnologias e a necessidade de se desenvolver uma cultura de valorização dos recursos tecnológicos onde o uso de tecnologia passe a fazer parte do cotidiano da formação docente. Palavras-chaves: Educação, tecnologia, universidade, formação, professor.

  15. High intensity electromagnetic field gerenation using a transportable reverberation chamber

    NARCIS (Netherlands)

    Leferink, Frank

    2008-01-01

    A reverberation chamber can create very high field strength with moderate input power. Existing chambers are making use of a paddle wheel to change the resonant modes in the chamber. A transportable reverberation chamber with vibrating walls will be presented. Inside this Vibrating Intrinsic Reverbe

  16. Open access

    CERN Document Server

    Suber, Peter

    2012-01-01

    The Internet lets us share perfect copies of our work with a worldwide audience at virtually no cost. We take advantage of this revolutionary opportunity when we make our work "open access": digital, online, free of charge, and free of most copyright and licensing restrictions. Open access is made possible by the Internet and copyright-holder consent, and many authors, musicians, filmmakers, and other creators who depend on royalties are understandably unwilling to give their consent. But for 350 years, scholars have written peer-reviewed journal articles for impact, not for money, and are free to consent to open access without losing revenue. In this concise introduction, Peter Suber tells us what open access is and isn't, how it benefits authors and readers of research, how we pay for it, how it avoids copyright problems, how it has moved from the periphery to the mainstream, and what its future may hold. Distilling a decade of Suber's influential writing and thinking about open access, this is the indispe...

  17. A emergência da tecnologia social: revisitando o movimento da tecnologia apropriada como estratégia de desenvolvimento sustentável The emergence of social technology: revisiting the appropriate technology movement as a strategy for sustainable development

    Directory of Open Access Journals (Sweden)

    Ivete Rodrigues

    2008-12-01

    Full Text Available Este artigo discute os conceitos concernentes à tecnologia social num mundo globalizado, em contraposição às propostas que defendem a adoção, pelas multinacionais, de estratégias organizacionais focadas na base da pirâmide social. Uma análise de aplicação desse novo conceito de tecnologia social é feita a partir de um estudo de caso. Como resultado, identificou-se o potencial inovador dessas tecnologias, em termos de eficácia, possibilidade de multiplicação e desenvolvimento em escala para a solução de problemas que afetam a maioria dos seres humanos, como os relacionados com a demanda por água, alimentos, educação, energia, saúde, entre outros, ao mesmo tempo que promovem a inclusão social e protegem o meio ambiente.This article discusses the concepts of social technology in a globalized world, in contrast with more recent views that advocate the adoption, by multinational companies, of organizational strategies focused on the base of the social pyramid. An analysis of the application of this new social technology concept is made through a case study. As a result, the innovative potential of these technologies was identified, in terms of efficiency, possibility of dissemination, and scale development, in order to solve problems that affect most people, such as those related to the demand for water, food, education, energy, and health. At the same time it should improve social inclusion and protect the environment.

  18. Rapid-Cycling Bubble-Chamber, details

    CERN Multimedia

    CERN PhotoLab

    1980-01-01

    Parts of the hydraulic expansion system of the Rapid-Cycling Bubble-Chamber (RCBC). RCBC was the largest of 3 rapid-cycling bubble-chambers (the others were LEBC and HOLEBC), used as target- and vertex-detectors within the European Hybrid Spectrometer (EHS) in the SPS North Area (EHN1). RCBC contained 250 l of liquid hydrogen and was located inside a 3 T superconducting magnet. It was designed for 30 expansions/s (100 times faster than BEBC), the system shown here allowed 50 expansions/s. RCBC operated from 1981 to 1983 for experiments NA21, NA22 and NA23 at a rate of 15 expansions/s, clocking up a total of over 4 million. In the rear, at left, is bearded Lucien Veillet; Augustin Didona is at the right. See also 8001009. The installation of the piston assembly in the RCBC chamber body is shown in the Annual Report 1980, p.65.

  19. Classification of the LHC BLM Ionization Chamber

    CERN Document Server

    Stockner, M; Fabjan, Christian Wolfgang; Holzer, E B; Kramer, Daniel

    2008-01-01

    The LHC beam loss monitoring (BLM) system must prevent the super conducting magnets from quenching and protect the machine components from damage. The main monitor type is an ionization chamber. About 4000 of them will be installed around the ring. The lost beam particles initiate hadronic showers through the magnets and other machine components. These shower particles are measured by the monitors installed on the outside of the accelerator equipment. For the calibration of the BLM system the signal response of the ionization chamber is simulated in GEANT4 for all relevant particle types and energies (keV to TeV range). For validation, the simulations are compared to measurements using protons, neutrons, photons and mixed radiation fields at various energies and intensities. This paper will focus on the signal response of the ionization chamber to various particle types and energies including space charge effects at high ionization densities.

  20. Synchronization of the CMS Cathode Strip Chambers

    CERN Document Server

    Raknessa, G; Wang, D

    2007-01-01

    The synchronization of the trigger and data acquisition systems for the Cathode Strip Chambers (CSCs) in the Compact Muon Solenoid (CMS) detector at CERN is described. The CSC trigger system is designed to trigger CMS on muons with high efficiency (~99% per chamber) and is able to accurately identify its 25ns proton bunch crossing. To date, asynchronous cosmic ray data have been used to define the protocol and to refine timing algorithms, allowing synchronization to be realized within and between chambers to within ±10 ns. Final synchronization of the CSCs requires timing parameters to be accurate to 2 ns. This goal will be readily achieved from the cosmic ray baseline using data taken with the synchronous beam structure of the Large Hadron Collider.

  1. Open Brief

    Directory of Open Access Journals (Sweden)

    Andrew Leach

    2013-11-01

    Full Text Available To commence the thirtieth annual conference of the Society of Architectural Historians, Australia and New Zealand (SAHANZ, held on Australia’s Gold Coast in July 2013, ten delegates were invited with very little warning to take five minutes and one image to offer a provocation on the open matters of architectural history in the present moment. The term “open” was taken as the conference theme—a device used by SAHANZ meetings not so much to define the scope of papers presented as to declare the conference flavour year by year. It was not, therefore, an open conference (anything goes so much as a conference on open issues (where, indeed, to go.  The ten interlocutors were invited after the conference to document their interventions and they are presented here as a record of the preoccupations of a specific moment and institutional geography with all the idiosyncrasies and commonalities it might reveal to a broader audience.

  2. Salários e tecnologia num modelo de crescimento com restrição externa Wages and technology in a growth model with external constraints

    Directory of Open Access Journals (Sweden)

    Marcus Dutra

    2006-04-01

    Full Text Available O modelo proposto formaliza uma preocupação que se encontra cada vez com mais freqüência na literatura, a saber, a de que trabalhadores que não têm acesso a condições adequadas de capacitação, saúde e motivação tendem a aprender menos, reduzindo a velocidade de inovação em produtos e processos na firma. Na medida em que a competitividade internacional repousa crescentemente na inovação e/ou na imitação rápida de tecnologia, um nível baixo de desenvolvimento humano implicará oportunidades de crescimento perdidas. Assim, o modelo assume que, até certo valor crítico do salário real, aumentos de salário real produzem aumentos de competitividade e da taxa de crescimento com equilíbrio externo, tornando compatíveis o crescimento econômico e a distribuição da renda, inclusive num contexto de abertura e de intensa concorrência internacional.The model formalizes a topic that the economic literature addresses with increasing frequency, namely that workers who have no access to adequate levels of education, health and motivation tend to learn more slowly and this in turn reduces the rate of innovation in products and processes in the firm. To the extent that international competitiveness increasingly relies on innovation and imitation of technology, a low level of human development will render lost opportunities for growth. Thus, the model assumes that - up to a certain critical level of the real wage - increases in real wages lead to a higher rate of growth consistent with balance-of-payments equilibrium, which makes compatible growth and income distribution even in contexts of external openness and intense international competition.

  3. A tecnologia como forma de controle burocrático: uma análise crítica do uso dos sistemas de segurança de informática em uma empresa de alta tecnologia.

    OpenAIRE

    Luis Hernan Contreras Pinochet; Isabella Freitas Gouveia de Vasconcelos

    2002-01-01

    O objetivo deste artigo é exemplificar algumas das contradições e paradoxos atuais que envolvem a implantação de novas tecnologias em organizações que buscam tornar-se “informacionais”. Vivemos uma época de ambigüidades e dualidades porque a partir da transição do modelo industrial para o pós-industrial os papéis sociais foram sendo redefinidos. O que se espera dos indivíduos no ambiente de trabalho, os comportamentos considerados certos e errados, os perfis profissionais, todos estes element...

  4. A tecnologia como forma de controle burocrático: uma análise crítica do uso dos sistemas de segurança de informática em uma empresa de alta tecnologia.

    OpenAIRE

    Luis Hernan Contreras Pinochet; Isabella Freitas Gouveia de Vasconcelos

    2002-01-01

    O objetivo deste artigo é exemplificar algumas das contradições e paradoxos atuais que envolvem a implantação de novas tecnologias em organizações que buscam tornar-se “informacionais”. Vivemos uma época de ambigüidades e dualidades porque a partir da transição do modelo industrial para o pós-industrial os papéis sociais foram sendo redefinidos. O que se espera dos indivíduos no ambiente de trabalho, os comportamentos considerados certos e errados, os perfis profissionais, todos estes element...

  5. Professor x tecnologia: uso da ferramenta Blendspace em sala de aula

    Directory of Open Access Journals (Sweden)

    Miguel A. de Oliveira Júnior

    2016-01-01

    Full Text Available Como tornar as aulas mais dinâmicas, atrativas e informativas? Esta deve ser a indagação principal da grande maioria dos docentes no Brasil. A educação passa por constantes mudanças e o aluno do século XXI que está cercado por novas tecnologias exige que as mesmas também ultrapassem o muro escolar. Para isto o professor deve buscar mecanismo ou ferramentas que deixem as aulas mais atrativas e dinâmicas. Uma pesquisa recente, divulgada pelo portal Aprendiz, do UOL, aponta que a web pode ser utilizada para criar uma interatividade entre alunos e professores, por meio da conexão de mídias. Para isto, ao propomos o uso da ferramenta Blendspace, em sala de aula, para que aconteça uma interação maior entre aluno/professor. Este recurso possibilita que a aula se torne mais interessante agregando informações atualizadas ao assunto tratado em qualquer disciplina do meio escolar. O Blendspace pode servir como um facilitador seja: com o acesso à internet, por meio das ferramentas Google; trazer novas informações ao conteúdo; dinamizar a forma que o material é passado ao aluno com apresentação de vídeos, fotos, notícias e músicas e aproximar o educador do educando tendo em vista os mecanismos disponibilizados pelo Blendspace. Sabemos que neste universo tecnológico várias ferramentas são oferecidas para auxílio na educação, optamos em apresentar o Blendspace por considerá-lo completo: rápido, fácil e educativo.

  6. O conhecimento e as tecnologias na sociedade da informação

    Directory of Open Access Journals (Sweden)

    Alzira Karla Araújo da Silva

    2010-01-01

    Full Text Available Artículo de reflexión en torno a la sociedad de la información, la sociedad del conocimiento, el paradigma de la cibercultura y el papel de las tecnologías de la información y la comunicación en el progreso social. Se resaltan los factores de inclusión y exclusión sociales que se producen en la sociedad de la información, y se señalan las acciones, intenciones y necesidades que le son propias. La reflexión contribuye a caracterizar la sociedad de la información en tanto busca entenderla desde perspectivas sociales, culturales, económicas y de búsqueda de la ciudadanía. En especial, se analizan los nuevos entornos originados por la revolución tecnológica y su impacto en la información y el conocimiento en un mundo globalizado. Se reconoce que la educación es uno de los pilares de construcción de esa sociedad y se pone como ejemplo el caso de Brasil, donde hay un círculo virtuoso de avances en el uso intensivo de las tecnologias informativas en las escuelas y en la enseñanza superior, gracias a la creación de nuevos espacios públicos, políticas educacionales y el desarrollo tecnológico. Se concluye que la inclusión y democratización de la información son inseparables y determinates para la consolidación de la sociedad de la información.

  7. LAYOUT CELULAR: PROPOSTA E IMPLANTAÇÃO EM EMPRESA START-UP DE TECNOLOGIA

    Directory of Open Access Journals (Sweden)

    Lucas Almeida Dos Santos

    2016-12-01

    Full Text Available A escolha correta de um layout proporciona à organização se adaptar para melhor utilizar seus recursos em busca da melhoria contínua. A presente pesquisa, apresenta a elaboração e implantação de um layout celular tendo por base o uso das ferramentas de processos, Fluxograma, 5W2H e Diagrama de causa e efeito, no apoio da tomada de decisão do melhor layout a ser implantado.  Diante do exposto, o escopo da pesquisa objetiva apresentar a implantação do layout celular em uma empresa start-up de tecnologia, bem como os resultados obtidos mediante a proposta apresentada. Como metodologia de pesquisa, definiu-se o presente estudo como um estudo de caso, onde foi possível realizar a análise da estrutura física que corresponde a 60 m² de área de produção, para implementar o layout celular. Como principal resultado obtido destaca-se o sucesso da implantação, onde, o mesmo atendeu todas as necessidades de fabricação do produto na organização pesquisada. Concomitantemente a evolução do layout, foram definidos quatro postos de trabalho, onde se tem a entrada de MP (matéria-prima em A e a saída do produto acabado em D, conforme exposto nos resultados.

  8. A integração bilateral Brasil-Argentina: tecnologia nuclear e Mercosul

    Directory of Open Access Journals (Sweden)

    Odete Maria de Oliveira

    1998-06-01

    Full Text Available O presente trabalho focaliza o complexo processo de integração bilateral Brasil-Argentina, iniciado formalmente na década de 80, desdobrado em sua dupla abrangência: a cooperação pacífica da tecnologia nuclear; b constituição de um mercado comum. A evolução desse processo conduziu-se através de ciclos fundamentais: primeira etapa, antecedentes de aproximação; segunda etapa, os decisivos instrumentos da ampla integração; terceira etapa, solidificação de duas bases, uma de nível tecnológico nuclear, pactuando um sistema sui generis de salvaguardas e a vigência do Tratado de Tlatelolco (emendado, e, outra, de nível econômico pelo Tratado de Assunção, instituindo o Mercosul.The present work focuses on the complex bilateral integration process involving Brazil and Argentina that began formally during the 80's, and displayed in its double scope: a pacific cooperation on nuclear technology; b constitution of a common market. This process evolution took place in three fundamental circles: the first one, approximation antecedents; the second one, decisive instruments for a large integration; and the third one, the solidification of two basis, one at the nuclear technological level, joining the two countries in the sui generis back up system and the operation of the Tlatelolco Treaty, the other, at the economic level instituting the Mercosur by the Asunción Treaty.

  9. As novas tecnologias da informação e o consumismo em saúde

    Directory of Open Access Journals (Sweden)

    Paulo Roberto Vasconcellos-Silva

    2010-08-01

    Full Text Available Uma ampliação dos conceitos de consumo tem se deslocado na direção de processos sociais até agora não contemplados por categorias tradicionais. A presente revisão analisa a aplicação dos conceitos clássicos sobre consumismo às práticas recentemente identificadas no campo da saúde, como o fenômeno da cibercondria. O desafio teórico se refere à dificuldade de extrapolação das perspectivas econômicas do consumismo às questões do auto-cuidado no contexto das tecnologias de informação e comunicação (TICs. Procura-se compreender o fenômeno da mercadorização do cuidar-de-si sob o imperativo da auto-responsabilização em saúde. São identificadas e descritas as novas identidades consumidoras em vista das inauditas questões acerca dos aprimoramentos técnicos a modificar a natureza do auto-cuidado. Conclui-se que a saúde é consumida como vitalidade decomposta em artefatos de comercializar no contexto de uma nova bioeconomia - não mais ligada à idéia de emulação e posse, e sim a novas formas de perceber-se e cuidar-se perante múltiplos riscos e novas definições do que é ser humano.

  10. As novas tecnologias da informação e o consumismo em saúde

    Directory of Open Access Journals (Sweden)

    Paulo Roberto Vasconcellos-Silva

    2010-08-01

    Full Text Available Uma ampliação dos conceitos de consumo tem se deslocado na direção de processos sociais até agora não contemplados por categorias tradicionais. A presente revisão analisa a aplicação dos conceitos clássicos sobre consumismo às práticas recentemente identificadas no campo da saúde, como o fenômeno da cibercondria. O desafio teórico se refere à dificuldade de extrapolação das perspectivas econômicas do consumismo às questões do auto-cuidado no contexto das tecnologias de informação e comunicação (TICs. Procura-se compreender o fenômeno da mercadorização do cuidar-de-si sob o imperativo da auto-responsabilização em saúde. São identificadas e descritas as novas identidades consumidoras em vista das inauditas questões acerca dos aprimoramentos técnicos a modificar a natureza do auto-cuidado. Conclui-se que a saúde é consumida como vitalidade decomposta em artefatos de comercializar no contexto de uma nova bioeconomia - não mais ligada à idéia de emulação e posse, e sim a novas formas de perceber-se e cuidar-se perante múltiplos riscos e novas definições do que é ser humano.

  11. "Antropologia reversa" e tecnologias digitais no contexto da migração internacional

    Directory of Open Access Journals (Sweden)

    Daniel Gordillo Sánchez

    2017-07-01

    Full Text Available Este artigo reflete sobre a dimensão criativa e reflexiva dos “objetos de pesquisa” ou dos informantes do antropólogo, no contexto dos estudos sobre a migração internacional, especificamente na corrente migratória de colombianos na cidade de Santiago, no Chile. Ressalta-se a importância dos imaginários e dos fatores socioculturais do fenômeno migratório, e, a partir disso, se evidencia como, através de um exercício de “antropologia reversa”, os sujeitos contestam o clássico divisor da pesquisa antropológica, “nós” e “eles”, reconfigurando as posições dentro da atividade investigativa. Desse modo, a partir de dois exemplos etnográficos se realçam e detalham os novos matizes e formas que adquire a interação entre pesquisador-pesquisado neste contexto, onde o etnógrafo é interpelado em campo. Além disso, dentro desse processo de quebra da “autoridade etnográfica” é fundamental ressaltar a incidência que têm as tecnologias digitais de comunicação, chaves na interação social e na conformação de redes sociais dos migrantes e potenciais migrantes. Isto provoca que os próprios instrumentos metodológicos do antropólogo sejam reavaliados/atualizados, conforme os mecanismos modernos para depositar e transmitir informação. Da mesma forma, com esta reflexão se espera questionar a retórica do texto etnográfico, e se mostram alguns possíveis caminhos para etnografias mais polifônicas nos estudos sobre a migração internacional.

  12. Status of COLDDIAG: A Cold Vacuum Chamber for Diagnostics

    CERN Document Server

    Gerstl, S; Casalbuoni, S; Grau, A W; Hagelstein, M; de Jauregui, D Saez; Boffo, C; Sikler, G; Baglin, V; Cox, M P; Schouten, J C; Cimino, R; Commisso, M; Spataro, B; Mostacci, A; Wallen, E J; Weigel, R; Clarke, J; Scott, D; Bradshaw, T W; Jones, R M; Shinton, I R.R

    2010-01-01

    One of the still open issues for the development of superconducting insertion devices is the understanding of the beam heat load. With the aim of measuring the beam heat load to a cold bore and the hope to gain a deeper understanding in the beam heat load mechanisms, a cold vacuum chamber for diagnostics is under construction. The following diagnostics will be implemented: i) retarding field analyzers to measure the electron energy and flux, ii) temperature sensors to measure the total heat load, iii) pressure gauges, iv) and mass spectrometers to measure the gas content. The inner vacuum chamber will be removable in order to test different geometries and materials. This will allow the installation of the cryostat in different synchrotron light sources. COLDDIAG will be built to fit in a short straight section at ANKA. A first installation at the synchrotron light source Diamond is foreseen in June 2011. Here we describe the technical design report of this device and the planned measurements with beam.

  13. Calibration of a pencil ionization chamber with and without preamplifier

    OpenAIRE

    Maia, Ana Figueiredo

    2004-01-01

    The pencil ionization chamber is a cylindrical dosimeter developed for computed tomography beams. Many kinds of ionization chambers have a preamplifier connected to the chamber to make it electrically more stable, specially for field instruments. In this study, the performance of a Victoreen pencil ionization chamber with the original preamplifier and after its removal was compared. The objective of the preamplifier removal was to enable connecting the chamber to other kinds of electromete...

  14. Ultra-low mass drift chambers

    Energy Technology Data Exchange (ETDEWEB)

    Assiro, R. [Istituto Nazionale di Fisica Nucleare, Lecce (Italy); Cappelli, L. [Università di Cassino e del Lazio Meridionale (Italy); Cascella, M. [Istituto Nazionale di Fisica Nucleare, Lecce (Italy); Dipartimento Matematica e Fisica, Università del Salento (Italy); De Lorenzis, L. [Istituto Nazionale di Fisica Nucleare, Lecce (Italy); Dipartimento di Ingegneria dell' Innovazione, Università del Salento (Italy); Grancagnolo, F. [Istituto Nazionale di Fisica Nucleare, Lecce (Italy); Ignatov, F. [Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation); L' Erario, A.; Maffezzoli, A. [Istituto Nazionale di Fisica Nucleare, Lecce (Italy); Dipartimento di Ingegneria dell' Innovazione, Università del Salento (Italy); Miccoli, A. [Istituto Nazionale di Fisica Nucleare, Lecce (Italy); Onorato, G. [Istituto Nazionale di Fisica Nucleare, Lecce (Italy); Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation); Università G. Marconi, Roma (Italy); Perillo, M. [EnginSoft S.p.a., Trento (Italy); Piacentino, G. [Istituto Nazionale di Fisica Nucleare, Lecce (Italy); Fermilab, Batavia, IL (United States); Università G. Marconi, Roma (Italy); Rella, S. [Istituto Nazionale di Fisica Nucleare, Lecce (Italy); Dipartimento di Ingegneria dell' Innovazione, Università del Salento (Italy); Rossetti, F. [EnginSoft S.p.a., Trento (Italy); Spedicato, M. [Istituto Nazionale di Fisica Nucleare, Lecce (Italy); Tassielli, G., E-mail: giovanni.tassielli@le.infn.it [Istituto Nazionale di Fisica Nucleare, Lecce (Italy); Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation); Università G. Marconi, Roma (Italy); and others

    2013-08-01

    We present a novel low mass drift chamber concept, developed in order to fulfill the stringent requirements imposed by the experiments for extremely rare processes, which require high resolutions (order of 100–200 keV/c) for particle momenta in a range (50–100 MeV/c) totally dominated by the multiple scattering contribution. We describe a geometry optimization procedure and a new wiring strategy with a feed-through-less wire anchoring system developed and tested on a drift chamber prototype under completion at INFN-Lecce.

  15. A view inside the Gargamelle bubble chamber

    CERN Multimedia

    1970-01-01

    Gargamelle was the name given to a big bubble chamber built at the Saclay Laboratory in France during the late 1960s. It was designed principally for the detection at CERN of the elusive particles called neutrinos. A bubble chamber contains a liquid under pressure, which reveals the tracks of electrically charged particles as trails of tiny bubbles when the pressure is reduced. Neutrinos have no charge, and so leave no tracks, but the aim with Gargamelle was "see neutrinos" by making visible any charged particles set in motion by the interaction of neutrinos in the liquid

  16. Cosmic Muon Detector Using Proportional Chambers

    CERN Document Server

    Varga, Dezső; Hamar, Gergő; Molnár, Janka Sára; Oláh, Éva; Pázmándi, Péter

    2015-01-01

    A set of classical multi-wire proportional chambers were designed and constructed with the main purpose of efficient cosmic muon detection. These detectors are relatively simple to construct, and at the same time are low cost, making them ideal for educational purposes. The detector layers have efficiencies above 99% for minimum ionizing cosmic muons, and their position resolution is about 1 cm, that is, particle trajectories are clearly observable. Visualization of straight tracks is possible using an LED array, with the discriminated and latched signal driving the display. Due to the exceptional operating stability of the chambers, the design can also be used for cosmic muon telescopes.

  17. Open Education and the Open Science Economy

    Science.gov (United States)

    Peters, Michael A.

    2009-01-01

    Openness as a complex code word for a variety of digital trends and movements has emerged as an alternative mode of "social production" based on the growing and overlapping complexities of open source, open access, open archiving, open publishing, and open science. This paper argues that the openness movement with its reinforcing structure of…

  18. Professores, tecnologias digitais e a distração concentrada Teachers, digital technologies and concentrated distraction

    Directory of Open Access Journals (Sweden)

    Vânia Gomes Zuin

    2011-12-01

    Full Text Available Os estudos das influências das novas tecnologias, presentes tanto na formação docente quanto em sua prática, têm sido objeto de muitas pesquisas na área de educação. Diante desse quadro, tem-se como objetivo investigar o modo como as novas tecnologias modificam a prática docente, principalmente no contexto atual, em que predomina a chamada distração concentrada nos processos de ensino e aprendizagem. Parte-se do pressuposto de que refletir sobre as relações entre tais tecnologias, os professores e os processos de ensino e aprendizagem implica considerar a redefinição imagética do professor, bem como dos métodos historicamente empregados para promover a disciplina e a concentração entre os estudantes.The studies of influences of new technologies, presented in teacher education as well as in its practice, have been the subject of many researches in the field of education. In this context, it is our aim to examine how new technologies modify teaching practices, especially in the nowadays context where the so called concentrated distraction predominates in teaching and learning process. Starting from the presupposed that to think about the relations among these technologies, teachers and process of teaching and learning it implies to consider the redefinition of the teacher's image, as well as the methods historically used to promote discipline and concentration among students.

  19. TECNOLOGIA NO SETOR AGRÍCOLA BRASILEIRO: UM OLHAR SOB A ÓTICA DA TEORIA EVOLUCIONÁRIA

    Directory of Open Access Journals (Sweden)

    Giovana Souza Freitas

    2013-06-01

    Full Text Available Um dos fatores de produção considerado primordial para garantir a competitividade do setor agrícola é a tecnologia. Busca-se, neste artigo, verificar se a tecnologia utilizada no setor agrícola brasileiro é compatível com a adotada no resto do mundo. Analisarse-á também a política tecnológica existente no Brasil de forma a tentar verificar como o governo está incentivando a produção científica e tecnológica. Trata-se de um estudo qualitativo, que utiliza-se do referencial teórico da teoria evolucionária (considerando rotinas, o caráter path dependence, o acesso às políticas públicas e o aprendizado para entender e explicar a realidade. Os resultados evidenciam que a situação dos produtores rurais com relação à adoção de tecnologias é bastante diversa entre os grandes e os pequenos produtores, o que altera as rotinas, o caráter path dependence, o acesso às políticas públicas e o aprendizado existente nas grandes e pequenas propriedades rurais. No entanto, graças às empresas multinacionais, o nível tecnológico utilizado pelo setor agrícola brasileiro é compatível com aquele utilizado pelo resto do mundo e a disseminação do nível tecnológico depende sobremaneira da política tecnológica e do acesso dos produtores rurais às políticas públicas.

  20. Realization of a cryogenic interface to an ultracold atomic chamber

    Science.gov (United States)

    Date, Aditya; Wang, Ke; Shaffer, Airlia; Patil, Yogesh Sharad; Schwab, Keith; Vengalattore, Mukund

    2016-05-01

    The control and manipulation of ultracold atoms in close proximity to cryogenic material surfaces opens up novel avenues for quantum sensing with cold atoms. However, integrating cryogenics with cold atomic systems presents the dual challenges of reducing thermal radiation load while allowing optimal optical access. Here, we present the realization of a unique interface between a cryogenic system and a room-temperature ultracold atomic chamber which allows for the optical trapping of cold atoms within microns of a sub-10 K cryogenic surface. Our interface serves as a platform for a cold-atoms based precision magnetic microscope for probing exotic condensed matter systems such as correlated electronic materials, as well as a platform for the realization of hybrid quantum systems. This work is supported by the DARPA QuASAR program through a grant from the ARO.

  1. The Open

    Directory of Open Access Journals (Sweden)

    Saitya Brata Das

    2009-12-01

    Full Text Available In the Open darkness and light, remembrance and oblivion, coming into existence and disappearing in death play their originary co-belonging, or co-figuration. Existence belongs to this opening and is exposed to its coming to presence: it is on the basis of this originary opening, this originary historical which is revealed to this mortal being called ‘man,’ on the basis of this revelation, man founds something like politics and history. There thus comes into existence out of this freedom, out of this “play space”2, this field called ‘polis’3 where there takes place war and festival, where historical revolutions tear apart history, brings ruptures and discontinuities in the very mode of his existence, where man seeks the foundation of his own foundation (which is his metaphysical task , where occurs the dialectics of negativity between man and man, where man puts at stake his own death, his own dissolution, and by the power of his own dissolution stands in relation to the total world that he seeks to dominate. This means that man’s attempts to metaphysically found his own political and historical existence must presuppose a far more originary non-foundation, the differentiating revealing of the open, the ungrounded spacing play, or playing space of natality and mortality.

  2. Open innovation

    DEFF Research Database (Denmark)

    West, Joel; Bogers, Marcel

    2017-01-01

    by small, new, and not-for-profit organizations, as well as the linkage of individual actions and motivations to open innovation. Other opportunities include better measuring the costs, benefits, antecedents, mediators and moderators of the effects of OI on performance, and understanding why and how OI...

  3. Valores sociais sobre incorporação de tecnologias: o que pensam os participantes do SUS.

    Directory of Open Access Journals (Sweden)

    Flávia Tavares Silva ELIAS

    2015-09-01

    Full Text Available O trabalho teve como objetivo conhecer a opinião dos delegados da 14ª Conferência Nacional de Saúde, ocorrida no período de 1º a 4 de dezembro de 2011, sobre os critérios de avaliação para incorporação de tecnologia para o sistema público de saúde no Brasil (SUS. Foi aplicado questionário para autopreenchimento aos visitantes do stand do Ministério da Saúde durante o evento. Um total de 11,5% dos participantes respondeu a pesquisa. Destes, 43,6% representaram cidadãos ou pacientes; 33,6% dos profissionais de saúde, 13,1% tomadores de decisão; 3,8% prestadores de serviços e 5,9% outros. A maioria já havia participado do controle social do SUS, há mais de cinco anos. Os critérios pré-definidos para a avaliação das tecnologias no questionário foram colocados em uma ordem hierárquica: a melhoria da qualidade de vida e sobrevida dos pacientes (60%; evidências sobre os efeitos previstos na prevenção, diagnóstico, tratamento ou reabilitação (49%; evidências sobre a segurança para o paciente / usuário / consumidor (46%; impacto sobre a saúde da população (43%; relação entre benefícios / efeitos da tecnologia e os custos (40%. Os «custos para o sistema de saúde» e «critérios de custos para os doentes» estavam em penúltimo e último lugar, respectivamente. As perspectivas dos doentes / cidadãos e profissionais de saúde devem ser estimulados a fim de apoiar a aplicação da Lei 12.401 / 2011, que estabelece critérios para Incorporação de Tecnologias da Saúde.

  4. Como conciliar humanização e tecnologia na formação de enfermeiras/os?

    Directory of Open Access Journals (Sweden)

    Dagmar Estermann Meyer

    2002-02-01

    Full Text Available O artigo discute a incorporação do tema da humanização do cuidado no contexto da Enfermagem brasileira, na atualidade. Dentre as muitas possibilidades de se abordar este tema, optou-se por problematizar a relação Enfermagem-tecnologia em uma perspectiva histórica, para então desenvolver a proposição da "ressignificação do humano" tomando como referência o conceito de ciborgue, tal como este vem sendo desenvolvido pela teorização feminista e cultural contemporânea.

  5. Tecnologias Educacionais em Cursos de Contabilidade Avaliados no Exame Nacional de Cursos (ENC/2003 com Conceitos A e B.

    Directory of Open Access Journals (Sweden)

    Maria Thereza Pompa Antunes

    2009-10-01

    Full Text Available Ao se vislumbrar o termo “tecnologia”, o que parece vir à mente são máquinas, chips, softwares. O termo “tecnologia”, quando relacionado ao ensino e à aprendizagem, abrange todo o processo do currículo, desde sua construção, até a execução e avaliação. Assim, todo o instrumental que se utiliza para formação profissional está relacionado ao termo “tecnologia”: a concepção teórica - metodológica, o modelo pedagógico, os recursos materiais, o sistema de avaliação etc. A problematização do papel das novas tecnologias da informação nos processos de mudança social e cultural no cenário da sociedade apresenta conseqüências tanto para a prática docente quanto para o processo de aprendizagem. Desse ponto de vista, a sociedade é a protagonista da mudança uma vez que toda opção tecnológica é social. Entre outros fatores, as novas tecnologias da informação possibilitaram o desenvolvimento acelerado do conhecimento na sociedade. Em vista do exposto, e tomando-se como princípio a realidade atual e a valorização do conhecimento, definiu-se o problema de pesquisa alvo de investigação desse trabalho, qual seja, a posição dos cursos de contabilidade nos dois primeiros níveis de avaliação do ENC (A ou B está relacionado com as tecnologias educacionais adotadas pelas IES? O objetivo geral associado ao problema é analisar a existência de correlação entre as tecnologias educacionais adotadas nas instituições de ensino superior brasileiras com cursos de ciências contábeis e o conceito obtido pela IES no ENC/2003 a partir dos elementos expressos nos sites das instituições referidas

  6. Eugenia no contexto do atual desenvolvimento das tecnologias genéticas: as deficiências em foco

    Directory of Open Access Journals (Sweden)

    Simone Moreira de Moura

    2016-05-01

    Full Text Available Neste texto faz-se uma reflexão sobre o discurso eugênico no contexto do atual desenvolvimento das tecnologias genéticas, orientando-se para tanto, pelas considerações de Theodor W. Adorno sobre o conceito de progresso numa sociedade marcada por um clima propício à barbárie, à frieza e à dessensibilização no tocante ao uso das intervenções genéticas sobre o corpo dos sujeitos considerados imperfeitos/deficientes.

  7. Elementos para pensar as tecnologias da informação na era da globalização

    OpenAIRE

    Bianco, Nélia R. Del

    2001-01-01

    O trabalho aborda a questão que na contemporaneidade, a base material que constitui a comunicação está mudando profundamente com o desenvolvimento das tecnologias da informação. O trabalho ainda aborda o questionamento se há uma nova forma de reflexão sobre a comunicação em tempos de globalização que supere as análises dualistas. Para um exame dessas questões foram escolhidos textos de Pierre Lévy, Lucien Sfez e Manuel Castells, autores que, de certa forma, sintetizam tipos mais freqüentes...

  8. TECNOLOGIAS DE INFORMAÇÃO E COMUNICAÇÃO NO APOIO AO ENSINO DE EMPREENDEDORISMO E PROJETOS

    OpenAIRE

    Filho, Antonio Costa Gomes; Rados, Gregório Jean Varvakis; Bastos, Rogério Cid

    2007-01-01

    No momento em que se discute o ensino a distância, não se deve esquecer que a maioria do ensino superior no Brasil ainda é presencial e que, em muitas situações os professores não utilizam nem mesmo as mais simples das tecnologias da informação e comunicação para interagir com seus alunos. A busca, por parte do egresso, de sua inserção profissional, passa necessariamente, pela possibilidade de gerar e gerir seu próprio negócio, transformando sonhos e idéias em projetos e empresas inovadoras. ...

  9. Tecnologias no aprendizado da Anatomia Humana: possíveis contribuições para o ensino da medicina.

    OpenAIRE

    Tatiana de Trotta; Carla Galvão Spinillo

    2014-01-01

    Este artigo investiga o uso de objetos tecnológicos no aprendizado sobre anatomia humana. A motivação está em saber se a tecnologia facilita o aprendizado de um conteúdo que é basicamente visual. Para tanto, foi feita uma leitura crítica de todos os documentos encontrados na revisão bibliográfica sistemática, pertinentes ao escopo escolhido. Os documentos foram apreciados a luz da teoria da carga cognitiva e da instrução multimídia. Como resultado foi feito um diagrama intitulado: conexões do...

  10. Impacto dos investimentos em tecnologia de informação no desempenho financeiro das indústrias brasileiras

    OpenAIRE

    Longo,Luci

    2014-01-01

    Os resultados obtidos possibilitam afirmar que as indústrias que mais investiram em Tecnologia de Informação (TI), no período de 2001 a 2011, obtiveram maior crescimento da sua receita operacional e resultados operacionais mais eficazes, comparadas com as indústrias que investiram menos no período. De acordo com o modelo proposto, para as empresas estudadas foi possível encontrar, no prazo de dois anos, um crescimento de 7% no resultado operacional para cada 1% a mais de investimentos em TI. ...

  11. De Born Global a multinacional. Caso de Estudo : sector das tecnologias de informação

    OpenAIRE

    Ramos, Ana Rita Palma Ramos

    2011-01-01

    Mestrado em Marketing Algumas empresas surgem com o intuito de serem globais, contudo só poucas alcançam o sucesso internacional e apresentam um crescimento positivo. Nesta sequência, e considerando como base os sectores das tecnologias de informação, é importante compreender até onde vai o sucesso e o crescimento das Born Globals portuguesas - que factores críticos são chave do sucesso e que base está por detrás do crescimento destas empresas. Na presente dissertação recorreu-se ao mét...

  12. Estudo sobre o software livre comissionado pelo Instituto Nacional da Tecnologia da Informação (ITI)

    OpenAIRE

    Falcão, Joaquim; Ferraz Junior, Tercio Sampaio; Lemos, Ronaldo; Maranhão, Juliano; Pereira de Souza, Carlos Affonso; Senna, Eduardo

    2009-01-01

    Estudo comissionado pelo Instituto Nacional de Tecnologia da Informação ao CTS/FGV Direito Rio, posteriormente convertido no livro "Direito do software livre e a Administraçõa Pública" (Rio de Janeiro: Lumen Juris, 2007). Aborda os seguintes temas: (a) a Constituição e o software livre; (b) aspectos do software livre sob o direito privado; e (c) software livre, Administração Pública e a comunhão do conhecimento informático.

  13. Tecnologia educacional no contexto do ensino de histologia: pesquisa e desenvolvimento de um ambiente virtual de ensino e aprendizagem

    OpenAIRE

    2011-01-01

    Discutem-se as mudanças constatadas no ensino da Histologia, como a tecnologia tem sido empregada nos contextos de aprendizagem, os aspectos pedagógicos inerentes à utilização de recursos, tais como atlas digitais e microscópios virtuais, e apresenta-se pesquisa sobre o desenvolvimento de um ambiente virtual de ensino-aprendizagem de Histologia, que contou com a participação de alunos e professores em sua construção. Verificou-se que os ambientes virtuais e outros recursos didátic...

  14. Tecnologia educacional no contexto do ensino de histologia: pesquisa e desenvolvimento de um ambiente virtual de ensino e aprendizagem

    OpenAIRE

    2011-01-01

    Discutem-se as mudanças constatadas no ensino da Histologia, como a tecnologia tem sido empregada nos contextos de aprendizagem, os aspectos pedagógicos inerentes à utilização de recursos, tais como atlas digitais e microscópios virtuais, e apresenta-se pesquisa sobre o desenvolvimento de um ambiente virtual de ensino-aprendizagem de Histologia, que contou com a participação de alunos e professores em sua construção. Verificou-se que os ambientes virtuais e outros recursos didáticos baseados ...

  15. METABOLISMO SOCIAL DO CAPITAL, NOVAS TECNOLOGIAS E OS DESAFIOS POLÍTICOS AOS TRABALHADORES: NOTAS AO DEBATE

    OpenAIRE

    Grossi, Monica

    2012-01-01

    Este texto tem como objetivo discutir a relação entre sociedade e natureza sob o capitalismo, a criação de novas tecnologias, como as nanotecnologias (NT), e a produção de sementes varietais, tendo em conta as implicações sociais e ambientais que se direcionam para a exploração do que Marx (1983) chama de as duas forças que produzem todas as riquezas: a natureza e o trabalho.

  16. Tecnologias de gênero e dispositivo amoroso nos filmes de animação da Disney

    OpenAIRE

    Monteiro, Clara; Zanello, Valeska

    2014-01-01

    Recursos midiáticos representam uma tecnologia de gênero poderosa na sociedade ocidental atual, expondo constantemente representações sociais diferenciadas para homens e mulheres. Tendo em vista que os desenhos de animação veiculados para crianças estabelecem um dos primeiros contatos com estes recursos, o presente estudo pretendeu identificar os estereótipos e valores de gênero que atravessam quatro filmes de animação de Walt Disney: “Cinderela”, “A Bela e a Fera”, “A Pequena Ser...

  17. Do local ao global: a utilização de tecnologias como ferramentas mediadoras do processo de aprendizagem na Geografia

    Directory of Open Access Journals (Sweden)

    Tiago Vieira Cavalcante

    2010-06-01

    Full Text Available

    O referido texto discute a necessidade e a possibilidade de relacionar o ensino de Geografia com as tecnologias, fazendo uma relação entre os aspectos locais e os globais, através da utilização de computadores, som, TV, DVD e Internet, assim como também a consulta a sites e softwares que podem ser utilizados de maneira didática. É enfocado o uso dessas tecnologias como meio de avaliação na produção de determinados materiais feitos pelos alunos. Este trabalho é destinado a todos aqueles que demonstram algum interesse pelas tecnologias e vêem a necessidade de dinamizar o ensino de Geografia através dessa ferramenta.

  18. Recursos para a formação de professores na área das tecnologias no âmbito do Projeto TACCLE2

    OpenAIRE

    Nabeiro, Ana Catarina Pereira Furtado, 1991-

    2015-01-01

    Tese de mestrado, Educação (Área de especialidade em Educação e Tecnologias Digitais), Universidade de Lisboa, Instituto de Educação, 2015 As tecnologias estão cada vez mais na moda e atualmente o número de aplicações disponíveis para os nossos aparelhos informáticos têm como principal objetivo facilitar o nosso dia-a-dia e a educação não é exceção a tudo isto. A formação de professores em tecnologias digitais está a aumentar cada vez mais, apesar de, ainda haver muitos docente...

  19. Environmental impact study due to end use energy technologies; Estudio prospectivo del impacto ambiental debido a tecnologias de uso final de la energia

    Energy Technology Data Exchange (ETDEWEB)

    Manzini Poli, Fabio

    1997-11-01

    Two thirds of the internal offer of energy in Mexico is consumed by end use sectors through end use technologies (TUF). Here is presented an integral conceptual frame for the environmental impact evaluation due to end use technologies, then the evolution of the interactions between technology-environment-fuel is analyzed in the long term (year 2025) according to three possible scenarios: business as usual, blocks and sustainable. [Spanish] Dos terceras partes de la oferta interna de energia en Mexico la utilizan los sectores de consumo final mediante tecnologias de uso final energetico. En el presente trabajo se introduce un marco conceptual integral para evaluar los impactos ambientales debidos a la utilizacion de tecnologias de uso final de la energia (TUF), luego se analiza la evolucion de las interacciones entre tecnologia-energetico-ambiente a largo plazo (ano 2025) de acuerdo a tres escenarios posibles: tendencial, bloques y sustentable.

  20. Produção de conhecimento como externalidade da incorporação de tecnologia pelo sistema público de saúde

    OpenAIRE

    Dayanna Hartmann Cambruzzi

    2010-01-01

    O Sistema Único de Saúde no Brasil (SUS) proporciona a incorporação de muitas tecnologias na área médica e, por conseguinte, pode estar exercendo um papel indireto na produção de conhecimento que não está sendo considerado como uma de suas qualidades. Objetivo: analisar se a incorporação de tecnologias pelo Sistema Único de Saúde no Brasil, mais especificamente fármacos, está associada a um aumento da produção de conhecimento científico nacional sobre estas tecnologias. Material e métodos: Tr...

  1. A Comunicação Social da Tecnologia Presente nos Livros Didáticos de Física do Brasil

    OpenAIRE

    Ricardo, Elio Carlos

    2015-01-01

    Nos últimos anos, vários países têm introduzido a educação tecnológica no programa escolar. No entanto, transpor a tecnologia para o conhecimento a ser ensinado não é simples. Este artigo analisa as concepções de educação tecnológica dos livros didáticos de física atualmente usados no sistema educacional brasileiro. Para isso, apresentamos i) a tecnologia como um conhecimento específico, para além do paradigma da tecnologia como uma ciência aplicada; ii) o problema do modelo clássico de trans...

  2. Open Source, Open Access, Open Review, Open Data. Initiativen zu mehr Offenheit in der digitalen Welt

    OpenAIRE

    Herb, Ulrich

    2011-01-01

    The article discusses the principles of openess, open access and open availability of information based on the examples of open access to scientific information, open government data, open geographical data and open source software.

  3. Open Source, Open Access, Open Review, Open Data. Initiativen zu mehr Offenheit in der digitalen Welt

    OpenAIRE

    Herb, Ulrich

    2011-01-01

    The article discusses the principles of openess, open access and open availability of information based on the examples of open access to scientific information, open government data, open geographical data and open source software.

  4. Anterior Chamber Live Loa loa: Case Report.

    Science.gov (United States)

    Kagmeni, G; Cheuteu, R; Bilong, Y; Wiedemann, P

    2016-01-01

    We reported a case of unusual intraocular Loa loa in a 27-year-old patient who presented with painful red eye. Biomicroscopy revealed a living and active adult worm in the anterior chamber of the right eye. After surgical extraction under local anesthesia, parasitological identification confirmed L. loa filariasis.

  5. Liquid ionization chambers for LET determination

    DEFF Research Database (Denmark)

    Kaiser, Franz-Joachim; Bassler, Niels; Tölli, Heikki

    Liquid ionization chambers [1] (LICs) have have been used in the last decades as background dosemeters. Since a few years LICs are also commercially available for dosimetry and are used for measurements of dose distributions where a high spatial distribution is necessary. Also in the last decades...

  6. Precision electronics for ionization chamber measurements

    Energy Technology Data Exchange (ETDEWEB)

    Santry, D.C.; Bowes, G.C.; Munzenmayer, K.

    1987-01-01

    By using commercially available units, an electrometer and an IBM personal computer, it was relatively inexpensive and simple to assemble a system which permits ..gamma..-ray-emitting radionuclide activities to be measured in an ionization chamber with an uncertainty of + - 0.5% and a reproducibility of + - 0.05%.

  7. Isolation of Drosophila egg chambers for imaging.

    Science.gov (United States)

    Parton, Richard M; Vallés, Ana Maria; Dobbie, Ian M; Davis, Ilan

    2010-04-01

    The fruit fly Drosophila melanogaster is an important model for basic research into the molecular mechanisms underlying cell function and development, as well as a major biomedical research tool. A significant advantage of Drosophila is the ability to apply live cell imaging to a variety of living tissues that can be dissected and imaged in vivo, ex vivo, or in vitro. Drosophila egg chambers, for example, have proven to be a useful model system for studying border cell migration, Golgi unit transport, the rapid movement of mRNA and protein particles, and the role of microtubules in meiosis and oocyte differentiation. A crucial first step before imaging is preparation of the experimental material to ensure physiological relevance and to achieve the best conditions for image quality. Early- to mid-stage egg chambers cannot be mounted in an aqueous-based medium, because this causes a change in microtubule organization and follicle cell morphology. Such egg chambers survive better in Halocarbon oil, which allows free diffusion of oxygen, has low viscosity, and thus prevents dehydration and hypoxia. With a refractive index similar to glycerol, Halocarbon oil also has good optical properties for imaging. It also provides a good environment for injection and is particularly useful for long-term imaging of embryos. However, unlike with aqueous solutions, changes in the medium are not possible. This protocol describes the isolation of Drosophila egg chambers.

  8. Using reverberation chambers for EM measurements

    NARCIS (Netherlands)

    Leferink, Frank B.J.

    2010-01-01

    Reverberation chambers (RC) are being used for several decades. The main advantage is the high field strength which can be generated, with only modest power. In the last few years the use of RCs became much popular, for testing multi-path propagation for communication links, or testing the coupling

  9. Prototype Vacuum Chamber for ISR Intersection Region

    CERN Multimedia

    1974-01-01

    The vacuum chambers at the ISR interaction region had to be as transparent as possible to the secondary particles emerging from the collision points. Made from stainless steel or titanium, only a fraction of a millimeter thick, they were most delicate to handle.

  10. Multiphysics Nuclear Thermal Rocket Thrust Chamber Analysis

    Science.gov (United States)

    Wang, Ten-See

    2005-01-01

    The objective of this effort is t o develop an efficient and accurate thermo-fluid computational methodology to predict environments for hypothetical thrust chamber design and analysis. The current task scope is to perform multidimensional, multiphysics analysis of thrust performance and heat transfer analysis for a hypothetical solid-core, nuclear thermal engine including thrust chamber and nozzle. The multiphysics aspects of the model include: real fluid dynamics, chemical reactivity, turbulent flow, and conjugate heat transfer. The model will be designed to identify thermal, fluid, and hydrogen environments in all flow paths and materials. This model would then be used to perform non- nuclear reproduction of the flow element failures demonstrated in the Rover/NERVA testing, investigate performance of specific configurations and assess potential issues and enhancements. A two-pronged approach will be employed in this effort: a detailed analysis of a multi-channel, flow-element, and global modeling of the entire thrust chamber assembly with a porosity modeling technique. It is expected that the detailed analysis of a single flow element would provide detailed fluid, thermal, and hydrogen environments for stress analysis, while the global thrust chamber assembly analysis would promote understanding of the effects of hydrogen dissociation and heat transfer on thrust performance. These modeling activities will be validated as much as possible by testing performed by other related efforts.

  11. Acoustical-Levitation Chamber for Metallurgy

    Science.gov (United States)

    Barmatz, M. B.; Trinh, E.; Wang, T. G.; Elleman, D. D.; Jacobi, N.

    1983-01-01

    Sample moved to different positions for heating and quenching. Acoustical levitation chamber selectively excited in fundamental and second-harmonic longitudinal modes to hold sample at one of three stable postions: A, B, or C. Levitated object quickly moved from one of these positions to another by changing modes. Object rapidly quenched at A or C after heating in furnace region at B.

  12. IKAR, a ionization chamber for WA9

    CERN Document Server

    1976-01-01

    This ionization chamber arrived at CERN from Leningrad for a high precision study of hadron elastic scattering by a CERN-Clermont-Ferrand-Leningrad-Lyon-Uppsala Collaboration in the H3 beam (WA9). G.A. Korolev (third from right) looks at the drawings.

  13. Chamber transport for heavy ion fusion

    Energy Technology Data Exchange (ETDEWEB)

    Olson, Craig L., E-mail: clolson66@msn.com

    2014-01-01

    A brief review is given of research on chamber transport for HIF (heavy ion fusion) dating from the first HIF Workshop in 1976 to the present. Chamber transport modes are categorized into ballistic transport modes and channel-like modes. Four major HIF reactor studies are summarized (HIBALL-II, HYLIFE-II, Prometheus-H, OSIRIS), with emphasis on the chamber transport environment. In general, many beams are used to provide the required symmetry and to permit focusing to the required small spots. Target parameters are then discussed, with a summary of the individual heavy ion beam parameters required for HIF. The beam parameters are then classified as to their line charge density and perveance, with special emphasis on the perveance limits for radial space charge spreading, for the space charge limiting current, and for the magnetic (Alfven) limiting current. The major experiments on ballistic transport (SFFE, Sabre beamlets, GAMBLE II, NTX, NDCX) are summarized, with specific reference to the axial electron trapping limit for charge neutralization. The major experiments on channel-like transport (GAMBLE II channel, GAMBLE II self-pinch, LBNL channels, GSI channels) are discussed. The status of current research on HIF chamber transport is summarized, and the value of future NDCX-II transport experiments for the future of HIF is noted.

  14. Heat-barrier coatings for combustion chambers

    Science.gov (United States)

    Carpenter, H. W.

    1970-01-01

    Arc-plasma-sprayed layered coating of graded Inconel and zirconia protects film-coolant ring below injector plate of rocket engine combustion chamber. Interfacial temperature is designed for minimum buildup of stress and to avoid melting of the metal phase in the graded layers.

  15. A large acceptance cylindrical drift chamber detector

    Energy Technology Data Exchange (ETDEWEB)

    Ambrose, D.A. [Texas Univ., Austin, TX (United States); Bachman, M.G. [Texas Univ., Austin, TX (United States); Coffey, W.P. [Texas Univ., Austin, TX (United States); Glass, G. [Texas Univ., Austin, TX (United States); McNaughton, K.H. [Texas Univ., Austin, TX (United States); Riley, P.J. [Texas Univ., Austin, TX (United States); Adams, D.L. [Rice University, Houston, TX 77251 (United States); Gaussiran, T.L. [Rice University, Houston, TX 77251 (United States); Hungerford, E.V. [University of Houston, Houston, TX 77204 (United States); Lan, K.A. [University of Houston, Houston, TX 77204 (United States); Johnston, K. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); McNaughton, M.W. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Penttila, S.I. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States); Supek, I. [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)

    1995-10-01

    This paper describes a large acceptance cylindrical drift chamber detector designed and built for the study of the np{yields}pp{pi}{sup -} reaction at neutron beam energies in the range 500-800 MeV. Details of construction, electronics, testing, and detection efficiencies and resolutions are presented. (orig.).

  16. The arrival of the CLOUD chamber

    CERN Multimedia

    CERN AVC

    2009-01-01

    The team from the CLOUD experiment - the world’s first experiment using a high-energy particle accelerator to study the climate - were on cloud nine after the arrival of their new three-metre diameter cloud chamber. This marks the end of three years’ R&D; and design, and the start of preparations for data taking later this year.

  17. Drift Chambers detectors; Detectores de deriva

    Energy Technology Data Exchange (ETDEWEB)

    Duran, I.; Martinez laso, L.

    1989-07-01

    We present here a review of High Energy Physics detectors based on drift chambers. The ionization, drift diffusion, multiplication and detection principles are described. Most common drift media are analysed, and a classification of the detectors according to its geometry is done. Finally the standard read-out methods are displayed and the limits of the spatial resolution are discussed. (Author) 115 refs.

  18. Projetos interdisciplinares no contexto do curso de tecnologia em hotelaria da faculdade de tecnologia Senac RS = Interdisciplinary projects within the context of the undergraduate course in hospitality technology of Senac RS college of technology

    Directory of Open Access Journals (Sweden)

    Dolci, Tissiane Schmidt

    2010-01-01

    Full Text Available O presente trabalho apresenta uma revisão bibliográfica, bem como, um relato quanto as experiências sobre práticas interdisciplinares desenvolvidas no Curso de Tecnologia em Hotelaria da Faculdade de Tecnologia do Serviço Nacional de Aprendizagem Comercial (Senac do Rio Grande do Sul (RS. Levanta os aspectos educacionais relativos a fragmentação dos currículos de curso e a necessidade de trabalhos interdisciplinares. Aborda conceitos e etapas do trabalho com projetos no âmbito da educação, abordando a atitude interdisciplinar do docente, a comunicação e o trabalho em equipe. Propõe uma discussão teórico-prática em busca de uma metodologia de projetos que permita e estimule o desenvolvimento das competências profissionais. A metodologia utilizada foi de caso de ensino e de coleta de dados a da observação participante e questionários preenchidos pelos professores. Os pesquisadores são participantes dos projetos, assim, trazendo também as suas observações e interpretações da realidade. Traz-se também as visões dos outros professores membros do projeto

  19. Development of Master Chamber Software for Data Acquisition of Ionization Chamber for Indus 2 RRCAT

    OpenAIRE

    Priyesh Soni; Mrs. B. Harita; Nawaz Ali Sayed

    2013-01-01

    The main goal of this paper was to Develop Master control software for DAQ of ionization chamber for INDUS-2 beam lines for detection of X-ray flux by an Ionization chamber that will remotely control and monitor the ultra low current signal detection analog module precisely. This application will be useful to measure the intensity of X-ray flux through ionization chamber in a beam line of synchrotron radiation source which is mounted in INDUS-2. It is one of new technique of detection. Beam l...

  20. Proposta de um modelo conceitual para análise do sucesso de projetos de transferência de tecnologia: estudo em empresas farmacêuticas

    Directory of Open Access Journals (Sweden)

    Takahashi Vânia Passarini

    2002-01-01

    Full Text Available A aquisição de conhecimentos tecnológicos externos tem se tornado uma prática comum para as empresas farmacêuticas desenvolverem medicamentos mais eficazes e seguros. Visando colaborar para o maior conhecimento sobre o sucesso da transferência de tecnologia nessas empresas, foi revisado o tema fatores de sucesso na transferência de tecnologia e analisada a aplicabilidade de um modelo conceitual em três empresas no Canadá.

  1. Consumo de produtos e serviços inovadores: aplicação do índice de prontidão para tecnologia

    OpenAIRE

    Peixoto Santa Rita, Luciana; Carlos de Araújo, Alcides; Almeida de Paula, Mainah; de Oliveira Lima, Manuella; Viana Filho, José Carlos

    2010-01-01

    Este estudo teve como objetivo mensurar o índice de prontidão para tecnologia no contexto do Estado de Alagoas. O estudo baseou-se na escala Índice de Prontidão para Tecnologia (Technology Readiness Index – TRI) de Parasuraman (2000). Foi realizada uma pesquisa descritiva de natureza quantitativa, baseada em uma amostra probabilística, com procedimentos de coleta e análise estruturados. A amostra foi composta de 326 respondentes, com margem de erro de 5,4% e nível de confiança de 95%. Os resu...

  2. Índice de Disposição para Tecnologia: Uma Análise do Consumo de Produtos e Serviços Inovadores

    OpenAIRE

    Rita, Luciana Rita Peixoto Santa; Universidade Federal de Alagoas; Araújo, Alcides Carlos de; UFAL; Paula, Mainah Almeida de; UFAL; Lima, Manuella de Oliveira; FEA/USP; Filho, José Carlos Viana; UFAL

    2009-01-01

    Com o advento da tecnologia de ponta, as relações consumidor empresa adquiriram formas diferentes. Em se tratando de produtos inovadores, que possuem ciclo de vida mais curto que os demais, estão ainda por estudar muitos aspectos do comportamento consumo. Neste sentido, o estudo de mercados de produtos de alta tecnologia desperta a atenção e o interesse, não somente de pesquisadores, mas também de empresas e governos. Diante desse contexto, este estudo tem como objetivo mensurar o ín...

  3. Dominância funcional e monitoramento da resistência de Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) a tecnologias Bt no Brasil

    OpenAIRE

    Renato Jun Horikoshi

    2016-01-01

    Plantas transgênicas que expressam toxinas de Bacillus thuringiensis Berliner (Bt) têm sido amplamente utilizadas para o controle de Spodoptera frugiperda (J. E. Smith) no Brasil. Entretanto, a evolução da resistência é um dos maiores entraves para a continuidade do uso desta tecnologia. Para subsidiar programas de Manejo da Resistência de Insetos (MRI), foram conduzidos estudos para o aprimoramento dos programas de manejo da resistência de S. frugiperda a tecnologias Bt. Foram realizadas est...

  4. A utilização das tecnologias da informação e comunicação no ensino dos 100 metros rasos

    OpenAIRE

    Ginciene, Guy [UNESP

    2012-01-01

    Observando o impacto das tecnologias em nossa sociedade, percebemos a necessidade de criar um material didático condizente com as Tecnologias da Informação e Comunicação capaz de subsidiar o trabalho do professor de Educação Física no ensino do atletismo, em especial, dos 100 metros rasos. Não por outro motivo, o objetivo desse trabalho foi organizar um material didático virtual, localizando jogos virtuais, vídeos, sites, blogs e redes sociais relacionados à prova dos 100 metros rasos, compon...

  5. APLICABILIDADE DA TECNOLOGIA MÓVEL EM ATIVIDADES DE SILVICULTURA DE PRECISÃO: MAPEAMENTO, INVENTÁRIO E GEOESTATÍSTICA FLORESTAIS

    OpenAIRE

    Catize Brandelero

    2007-01-01

    A aplicação de tecnologia móvel nas atividades de silvicultura de precisão em florestas plantadas envolve o mapeamento, o inventário e a geoestatística. Essa pesquisa possui o objetivo de avaliar e demonstrar as potencialidades da tecnologia móvel em atividades de silvicultura de precisão. Neste trabalho foi avaliada a precisão de levantamentos de áreas florestais com aparelhos GPS integrados, através de conexão bluetooth com computador do tipo Pocket PC, em relação a medições processadas ...

  6. OpenAPC. Open-Access-Publikationskosten als Open Data

    OpenAIRE

    Tullney, Marco

    2015-01-01

    Präsentationsfolien zum Vortrag „OpenAPC. Open-Access-Publikationskosten als Open Data“ in der Session „Ausgestaltung eines wissenschaftsadäquaten APC-Marktes: Grundsätze, Finanzierungsansätze und Management“ der Open-Access-Tage 2015 in Zürich (https://www.open-access.net/community/open-access-tage/open-access-tage-2015-zuerich/programm/#c1974)

  7. Novas tecnologias e aprendizagem de língua inglesa: potencialidades num ambiente complexo

    Directory of Open Access Journals (Sweden)

    Dulci Marlise Boettcher

    2011-01-01

    Full Text Available Este artigo objetiva compreender o fenômeno técnico na sua complexidade,discutindo-o a partir de outras perspectivas que contribuam para uma mais educação que considere as necessidades individuais dos seres humanos, levando em conta a utilização de um Ambiente Virtual de Aprendizagem como ferramenta de trabalho e espaço virtual de convivência. Para tanto, são considerados como princípios norteadores, a teoria da Biologia da Cognição de Humberto Maturana e Francisco Varela, os estudos sobre tecnologia de Pierre Levy, bem como os pressupostos sobre complexidade de Edgar Morin. A Internet, considerando suas características como a recursividade, interação e autonomia, possibilita a construção do aprendizado, e mais especificamente do aprendizado da língua inglesa. Esse ambiente complexo serve, dessa forma, como importante instrumento de potencialização do conhecimento/subjetividade, mostrando resultados importantes na aprendizagem dessa língua, por enfatizar o estar junto virtual e estabelecer novas relações com o saber que oportuniza a construção do conhecimento e de novos cenários mundiais.Abstract This article aims to understand the phenomenon in its technical complexity, discussing it from different perspectives that contribute to the expansion of education, taking into account the use of a Virtual Learning Environment as a tool for working and living in virtual space. Thus, are seen as guiding principles, the theory of biology of cognition of Humberto Maturana and Francisco Varela, studies on technology-Pierre Levy, as well as assumptionsabout the complexity of Edgar Morin. The Internet, considering its features such as recursion, interaction and autonomy, allows the construction of learning, and more specifically the learning of English. This complex environment is thus an important tool for enhancement of knowledge / subjectivity, showing significant results in learning that language, to emphasize the virtual being

  8. Gerenciamento de novas tecnologias em centro cirúrgico pelas enfermeiras nos hospitais de feira de Santana - Ba

    Directory of Open Access Journals (Sweden)

    Marluce Alves Nunes Oliveira

    2004-06-01

    Full Text Available Trata-se de estudo quantitativo exploratório descritivo sobre o nível de adequação ao domínio das novas tecnologias (NADNT das enfermeiras no gerenciamento de centro cirúrgico em hospitais de Feira de Santana - BA - Brasil, 2002. Teve como objetivos: avaliar o NADNT das enfermeiras no gerenciamento de centro cirúrgico (CC; identificar e descrever os fatores que interferem neste nível, bem como propor ações para o desenvolvimento deste nível no gerenciamento de CC. Amostra constituída por 33 enfermeiras com experiência de CC. Utlizou-se questionário para a coleta de dados. Conclui-se que o NADNT foi insatisfatório por 54,5% dos sujeitos do estudo. Comprovou-se estatisticamente que a capacidade do hospital e a carga horária são fatores que interferem no domínio das novas tecnologias em CC.

  9. A comunicação profissional de saúde x cliente diante das novas tecnologias

    Directory of Open Access Journals (Sweden)

    Carmen Luci R. Lopes

    1998-03-01

    Full Text Available Estudo descritivo exploratório com abordagem quanti-qualitativa realizado em unidades das redes pública e privada localizadas em Goiânia-Go., nos meses de agosto e setembro de 1997 com objetivos de averiguar o entendimento dos clientes a respeito da comunicação dos profissionais que executam os exames de alta tecnologia e detectar junto ao cliente a existência de orientação sobre o exame a ser realizado e o que sentem durante a realização destes. A população constitui-se de clientes de ambos os sexos que se submeteram a exames diagnósticos de alta tecnologia. Os dados foram coletados pelas pesquisadoras e auxiliares de pesquisa, mediante entrevista semi-estruturada entre os clientes sujeitos do estudo. Através dos resultados, concluímos que a maioria dos clientes não recebem orientação, deixaram de pedir informações sobre o exame realizado por vários motivos, inclusive receio do desconhecido. A comunicação foi restrita. Medo da dor, do resultado, desconforto foram também relatados.

  10. O Processo de Aquisição de Tecnologia pela Indústria Petroquímica Brasileira

    Directory of Open Access Journals (Sweden)

    Hemais Carlos A.

    2001-01-01

    Full Text Available Um dos setores industriais brasileiros mais dinâmicos, a indústria petroquímica, está localizada em três pólos (Camaçari, São Paulo e Triunfo e hoje representa cerca de 2% do PIB do país. O estabelecimento dessa indústria no Brasil ocorreu há menos de 30 anos, por iniciativa governamental, através da adoção de um modelo societário de empresa chamado modelo tripartite. Neste modelo 1/3 do capital era proveniente da Petroquisa, 1/3 de sócio privado nacional e 1/3 de sócio estrangeiro, geralmente fornecedor da tecnologia, que era explorada pela formação de joint-ventures. Apesar de já ser uma indústria consolidada e de grande potencial de exportação, a petroquímica ainda é bastante dependente tecnologicamente de fontes exógenas e essa dependência não parece que será eliminada a curto prazo. O presente trabalho examina o processo de aquisição tecnológica por parte da indústria petroquímica brasileira, dando ênfase ao uso de joint-ventures como a forma escolhida para obtenção da tecnologia.

  11. Anterior chamber fixation of a posterior chamber intraocular lens: A novel technique

    Directory of Open Access Journals (Sweden)

    A Sahap Kükner

    2014-01-01

    Full Text Available We aimed to evaluate the implantation of a posterior chamber intraocular lens (IOL in the anterior chamber (AC with the haptics passing through two iridectomies to the posterior chamber. A total of 33 eyes of 33 patients with inadequate posterior capsular support due to either previous aphakia or posterior capsular rupture during cataract extraction were included in the study. A double iridectomy was performed on all patients using a vitrectomy probe on the midperiphery of the iris. IOLs were implanted in the AC, and the haptics were passed through the iridectomies to the posterior chamber. The mean follow-up time was 25.3 months. AC hemorrhage occurred in five patients during the iridectomy procedure. Corneal edema was detected in eight of 14 patients with primary IOL insertions. Haptic dislocation was detected in only one patient. This technique may be a good alternative to scleral-fixated IOL implantation in eyes with aphakia.

  12. Achievable field strength in reverberation chambers

    Directory of Open Access Journals (Sweden)

    N. Eulig

    2003-01-01

    Full Text Available Feldvariable Kammern (FVK, engl.: modestirred- chamber werden unter anderem für EMV-Störfestigkeitsprüfungen verwendet. Ein häufig genanntes Argument, das die Einführung dieser Kammern als normgerechte Prüfumgebung vorantreiben soll, ist eine hohe Feldstärke, die im Vergleich zu anderen Testumgebungen mit relativ moderaten HF-Leistungen erreicht werden kann. Besonders für sicherheitskritische Geräte, wie Komponenten aus der Avionik- oder KFZ-Industrie, sind heutzutage Testfeldstärken von mehreren 100 V/m notwendig. Derart hohe Feldstärken können in Umgebungen, die ein ebenes Wellenfeld erzeugen oder nachbilden, nur mit großen HFLeistungen generiert werden. Durch die Resonanzeigenschaften einer FVK können demgegenüber mit sehr viel weniger Leistung und damit Verstärkeraufwand vergleichbare Werte der Feldstärke erzeugt werden. Allerdings sinkt mit zunehmendem Volumen die erreichbare Feldstärke bei gleicher Speiseleistung. Idealerweise sollen Feldvariable Kammern bei möglichst niedrigen Frequenzen für EMVTests nutzbar sein, was jedoch ein großes Kammervolumen erfordert. Das Problem, bei niedrigen Frequenzen hohe Feldstärken erzeugen zu können, relativiert deshalb den Vorteil von FVKn gegenüber bekannten Testumgebungen bei niedrigen Testfrequenzen. Der Posterbeitrag erläutert, welche Feldstärken in verschieden großen Feldvariablen Kammern beim Einspeisen einer bestimmten hochfrequenten Leistung erreicht werden können. Anhand dieser Ergebnisse wird aufgezeigt, oberhalb welcher Grenzfrequenz eine Anwendung von FVKn nur sinnvoll erscheint. Mode-stirred chambers (MSCs can be used for radiated immunity tests in EMC testing. Advantageous compared to conventional test methods is the high field strength which can here be generated with less RF-Power. This point is often the main argument for pushing the standardization of MSCs as an other EMC testing environment. Especially for safety-critical electronic equipment like avionic or

  13. A new plant chamber facility, PLUS, coupled to the atmosphere simulation chamber SAPHIR

    Science.gov (United States)

    Hohaus, T.; Kuhn, U.; Andres, S.; Kaminski, M.; Rohrer, F.; Tillmann, R.; Wahner, A.; Wegener, R.; Yu, Z.; Kiendler-Scharr, A.

    2016-03-01

    A new PLant chamber Unit for Simulation (PLUS) for use with the atmosphere simulation chamber SAPHIR (Simulation of Atmospheric PHotochemistry In a large Reaction Chamber) has been built and characterized at the Forschungszentrum Jülich GmbH, Germany. The PLUS chamber is an environmentally controlled flow-through plant chamber. Inside PLUS the natural blend of biogenic emissions of trees is mixed with synthetic air and transferred to the SAPHIR chamber, where the atmospheric chemistry and the impact of biogenic volatile organic compounds (BVOCs) can be studied in detail. In PLUS all important environmental parameters (e.g., temperature, photosynthetically active radiation (PAR), soil relative humidity (RH)) are well controlled. The gas exchange volume of 9.32 m3 which encloses the stem and the leaves of the plants is constructed such that gases are exposed to only fluorinated ethylene propylene (FEP) Teflon film and other Teflon surfaces to minimize any potential losses of BVOCs in the chamber. Solar radiation is simulated using 15 light-emitting diode (LED) panels, which have an emission strength up to 800 µmol m-2 s-1. Results of the initial characterization experiments are presented in detail. Background concentrations, mixing inside the gas exchange volume, and transfer rate of volatile organic compounds (VOCs) through PLUS under different humidity conditions are explored. Typical plant characteristics such as light- and temperature- dependent BVOC emissions are studied using six Quercus ilex trees and compared to previous studies. Results of an initial ozonolysis experiment of BVOC emissions from Quercus ilex at typical atmospheric concentrations inside SAPHIR are presented to demonstrate a typical experimental setup and the utility of the newly added plant chamber.

  14. A new plant chamber facility PLUS coupled to the atmospheric simulation chamber SAPHIR

    Science.gov (United States)

    Hohaus, T.; Kuhn, U.; Andres, S.; Kaminski, M.; Rohrer, F.; Tillmann, R.; Wahner, A.; Wegener, R.; Yu, Z.; Kiendler-Scharr, A.

    2015-11-01

    A new PLant chamber Unit for Simulation (PLUS) for use with the atmosphere simulation chamber SAPHIR (Simulation of Atmospheric PHotochemistry In a large Reaction Chamber) has been build and characterized at the Forschungszentrum Jülich GmbH, Germany. The PLUS chamber is an environmentally controlled flow through plant chamber. Inside PLUS the natural blend of biogenic emissions of trees are mixed with synthetic air and are transferred to the SAPHIR chamber where the atmospheric chemistry and the impact of biogenic volatile organic compounds (BVOC) can be studied in detail. In PLUS all important enviromental parameters (e.g. temperature, PAR, soil RH etc.) are well-controlled. The gas exchange volume of 9.32 m3 which encloses the stem and the leafes of the plants is constructed such that gases are exposed to FEP Teflon film and other Teflon surfaces only to minimize any potential losses of BVOCs in the chamber. Solar radiation is simulated using 15 LED panels which have an emission strength up to 800 μmol m-2 s-1. Results of the initial characterization experiments are presented in detail. Background concentrations, mixing inside the gas exchange volume, and transfer rate of volatile organic compounds (VOC) through PLUS under different humidity conditions are explored. Typical plant characteristics such as light and temperature dependent BVOC emissions are studied using six Quercus Ilex trees and compared to previous studies. Results of an initial ozonolysis experiment of BVOC emissions from Quercus Ilex at typical atmospheric concentrations inside SAPHIR are presented to demonstrate a typical experimental set up and the utility of the newly added plant chamber.

  15. Inovatividade organizacional e seus antecedentes: um estudo aplicado às tecnologias para pecuária

    Directory of Open Access Journals (Sweden)

    Eneida Bezerra Soares Ribeiro

    2011-12-01

    Full Text Available Neste estudo, propõe-se um modelo para explicar a inovatividade dos pecuaristas de gado de corte sob a perspectiva organizacional. Segundo a teoria de difusão de inovações, a inovatividade organizacional é caracterizada como o grau em que uma organização inova relativamente mais cedo do que as demais. Para avaliar a inovatividade, quatro antecedentes foram considerados, sendo: as características percebidas da inovação compostas por vantagem relativa, compatibilidade, imagem, demonstração de resultado, visibilidade, experimentabilidade, voluntariedade e facilidade de uso; a participação dos pecuaristas em redes sociais, caracterizadas como redes de relacionamentos entre pares; as fontes de informação comercial, caracterizadas como informações obtidas por meio dos relacionamentos para reduzir os riscos; a psicografia organizacional, composta por direção, centralidade da decisão, abertura de comunicação e motivação para a conquista. Os quatro construtos possuem uma relação positiva com a inovatividade organizacional. Com amostragem não probabilística por conveniência, foram obtidos 205 questionários válidos. Na análise de componentes múltiplos, observou-se que o perfil dos respondentes se mostrou distinto quanto à inovatividade. Essa distinção motivou a geração de uma taxonomia com base no perfil de adoção de tecnologias com o objetivo de identificar as diferenças no comportamento inovativo, o que resultou em três grupos. Assim, três modelos foram analisados e comparados por meio da modelagem de equações estruturais, utilizando-se o método Partial Least Square (PLS. Os resultados mostraram que o grupo dos menos inovadores pauta suas decisões de adoção de novas tecnologias pelas redes sociais, pela compatibilidade da tecnologia com suas atividades organizacionais e pela imagem que ela tem perante os demais pecuaristas. Os intermediários têm uma psicografia organizacional voltada para a

  16. Brazilian university technology transfer to rural areas Transferência de tecnologia de universidades brasileiras na área rural

    Directory of Open Access Journals (Sweden)

    Enio Marchesan

    2010-10-01

    Full Text Available In agriculture, there is a difference between average yield obtained by farmers and crop potential. There is technology available to increase yields, but not all farmers have access to it and/or use this information. This clearly characterizes an extension and technology transference problem. There are several technology transfer systems, but there is no system to fit all conditions. Therefore, it is necessary to create extension solutions according to local conditions. Another rural extension challenge is efficiency, despite continuous funding reductions. One proposal that has resulted from extension reform worldwide has suggested integration between the public and private sectors. The public universities could play the role of training and updating technical assistance of human resources, which is the one of the main aspects that has limited technology transfer. The objective of this study was to identify approaches to promote technology transfer generated in Brazilian public universities to rural areas through literature review. An experimental approach of technology transfer is presented here where a Brazilian university extension Vice-chancellor incorporates professionals from consolidated research groups according to demand. In this way, public universities take part of their social functions, by integrating teaching, research, and extension.Em agricultura, há diferenças entre a produtividade média obtida pelos produtores e o potencial produtivo dos cultivos. Há informação tecnológica disponível para aumentar a produtividade, mas nem todos os produtores têm acesso e/ou usam a informação. Isso caracteriza claramente um problema de extensão e transferência de tecnologia. Há vários sistemas de transferência de tecnologia, mas, como não há sistema que se ajuste a todas as condições, é necessário criar alternativas adequadas às condições de cada local. Outro desafio da extensão rural é ser eficiente, apesar da cont

  17. Identification of Low Momentum Electrons in The Time Projection Chamber of The ALICE Detector.

    CERN Document Server

    Mwewa, Chilufya

    2013-01-01

    This paper presents results obtained in the study to identify noisy low momentum electrons in the Time Projection Chamber (TPC) of the ALICE detector. To do this, the Circle Hough Transform is employed under the openCV library in python programming. This is tested on simulated tracks in the transverse view of the TPC. It is found that the noisy low momentum electrons can be identified and their exact positions in the transverse plane can be obtained.

  18. Convective Regimes in Crystallizing Basaltic Magma Chambers

    Science.gov (United States)

    Gilbert, A. J.; Neufeld, J. A.; Holness, M. B.

    2015-12-01

    Cooling through the chamber walls drives crystallisation in crustal magma chambers, resulting in a cumulate pile on the floor and mushy regions at the walls and roof. The liquid in many magma chambers, either the bulk magma or the interstitial liquid in the mushy regions, may convect, driven either thermally, due to cooling, or compositionally, due to fractional crystallization. We have constructed a regime diagram of the possible convective modes in a system containing a basal mushy layer. These modes depend on the large-scale buoyancy forcing characterised by a global Rayleigh number and the proportion of the chamber height constituting the basal mushy region. We have tested this regime diagram using an analogue experimental system composed of a fluid layer overlying a pile of almost neutrally buoyant inert particles. Convection in this system is driven thermally, simulating magma convection above and within a porous cumulate pile. We observe a range of possible convective regimes, enabling us to produce a regime diagram. In addition to modes characterised by convection of the bulk and interstitial fluid, we also observe a series of regimes where the crystal pile is mobilised by fluid motions. These regimes feature saltation and scouring of the crystal pile by convection in the bulk fluid at moderate Rayleigh numbers, and large crystal-rich fountains at high Rayleigh numbers. For even larger Rayleigh numbers the entire crystal pile is mobilised in what we call the snowglobe regime. The observed mobilisation regimes may be applicable to basaltic magma chambers. Plagioclase in basal cumulates crystallised from a dense magma may be a result of crystal mobilisation from a plagioclase-rich roof mush. Compositional convection within such a mush could result in disaggregation, enabling the buoyant plagioclase to be entrained in relatively dense descending liquid plumes and brought to the floor. The phenocryst load in porphyritic lavas is often interpreted as a

  19. Open Images

    DEFF Research Database (Denmark)

    Sanderhoff, Merete

    2013-01-01

    Museums around the world hold enormous troves of public domain artworks. In digitized form, they can be powerful tools for research and learning, as well as building blocks, in the hands of students, teachers, scholars, developers, and creative people. By opening up their digitized assets for reuse......, museums have a unique opportunity to broaden the scope of their public mission to serve and educate the public on 21st century media terms. What could be controversial about that? Art museums have a long legacy of restricting access to high quality images of artworks in order to protect them from improper...

  20. Open University

    CERN Document Server

    Pentz,M

    1975-01-01

    Michel Pentz est née en Afrique du Sud et venu au Cern en 1957 comme physicien et président de l'associaion du personnel. Il est également fondateur du mouvement Antiapartheid de Genève et a participé à la fondation de l'Open University en Grande-Bretagne. Il nous parle des contextes pédagogiques, culturels et nationaux dans lesquels la méthode peut s'appliquer.