Wire chambers: Trends and alternatives

International Nuclear Information System (INIS)

Regler, Meinhard

1992-01-01

The subtitle of this year's Vienna Wire Chamber Conference - 'Recent Trends and Alternative Techniques' - signalled that it covered a wide range of science and technology. While an opening Vienna talk by wire chamber pioneer Georges Charpak many years ago began 'Les funerailles des chambres a fils (the burial of wire chambers)', the contrary feeling this year was that wire chambers are very much alive!

Gridded ionization chamber

International Nuclear Information System (INIS)

Houston, J.M.

1977-01-01

An improved ionization chamber type x-ray detector comprises a heavy gas at high pressure disposed between an anode and a cathode. An open grid structure is disposed adjacent the anode and is maintained at a voltsge intermediate between the cathode and anode potentials. The electric field which is produced by positive ions drifting toward the cathode is thus shielded from the anode. Current measuring circuits connected to the anode are, therefore, responsive only to electron current flow within the chamber and the recovery time of the chamber is shortened. The grid structure also serves to shield the anode from electrical currents which might otherwise be induced by mechanical vibrations in the ionization chamber structure

Tecnologias e letramento digital: navegando rumo aos desafios

Directory of Open Access Journals (Sweden)

Ivanda Martins Silva

2011-12-01

Full Text Available Computadores, celulares, redes sociais, ferramentas de pesquisa e interação on-line são recursos utilizados pelos alunos no mundo dinâmico da cibercultura. As tecnologias da informação e comunicação estão exigindo leitores e produtores de textos ainda mais participativos. Aos textos impressos, somam-se os hipertextos e os suportes eletrônicos, que demandam diferentes estratégias de leitura e escrita. Será que a escola consegue criar espaços para as práticas de letramento digital dos alunos? Os professores precisam aprender a gerenciar as tecnologias da informação e comunicação. Ensinar com e para o uso crítico das tecnologias é função primordial da escola no processo de inclusão digital. Nesse sentido, não basta apenas usar aleatoriamente as tecnologias, sem planejamentos ou objetivos claros, mas sim transformar as relações dos sujeitos com os suportes tecnológicos. O presente trabalho discute a inserção das tecnologias na escola e apresenta contribuições para repensar o planejamento didático, considerando a diversidade de recursos tecnológicos que os professores podem utilizar na organização de situações de aprendizagem que levem o aluno a aprimorar as práticas de letramento digital.

Characterizing the active opening of the eustachian tube in a hypobaric/hyperbaric pressure chamber.

Science.gov (United States)

Mikolajczak, Stefanie; Meyer, Moritz Friedo; Hahn, Moritz; Korthäuer, Christine; Jumah, Masen Dirk; Hüttenbrink, Karl-Bernd; Grosheva, Maria; Luers, Jan Christoffer; Beutner, Dirk

2015-01-01

Active and passive opening of the Eustachian tube (ET) enables direct aeration of the middle ear and a pressure balance between middle ear and the ambient pressure. The aim of this study was to characterize standard values for the opening pressure (ETOP), the opening frequency (ETOF), and the opening duration (ETOD) for active tubal openings (Valsalva maneuver, swallowing) in healthy participants. In a hypobaric/hyperbaric pressure chamber, 30 healthy participants (19 women, 11 men; mean age, 25.57 ± 3.33 years) were exposed to a standardized profile of compression and decompression. The pressure values were recorded via continuous impedance measurement during the Valsalva maneuver and swallowing. Based on the data, standard curves were identified and the ETOP, ETOD, and ETOF were determined. Recurring patterns of the pressure curve during active tube opening for the Valsalva maneuver and for active swallowing were characterized. The mean value for the Valsalva maneuver for ETOP was 41.21 ± 17.38 mbar; for the ETOD, it was 2.65 ± 1.87 seconds. In the active pressure compensation by swallowing, the mean value for the ETOP was 29.91 ± 13.07 mbar; and for the ETOD, it was 0.82 ± 0.53 seconds. Standard values for the opening pressure of the tube and the tube opening duration for active tubal openings (Valsalva maneuver, swallowing) were described, and typical curve gradients for healthy subjects could be shown. This is another step toward analyzing the function of the tube in compression and decompression.

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.

Response of the rhizosphere prokaryotic community of barley (Hordeum vulgare L.) to elevated atmospheric CO2 concentration in open-top chambers.

Science.gov (United States)

Szoboszlay, Márton; Näther, Astrid; Mitterbauer, Esther; Bender, Jürgen; Weigel, Hans-Joachim; Tebbe, Christoph C

2017-08-01

The effect of elevated atmospheric CO 2 concentration [CO 2 ] on the diversity and composition of the prokaryotic community inhabiting the rhizosphere of winter barley (Hordeum vulgare L.) was investigated in a field experiment, using open-top chambers. Rhizosphere samples were collected at anthesis (flowering stage) from six chambers with ambient [CO 2 ] (approximately 400 ppm) and six chambers with elevated [CO 2 ] (700 ppm). The V4 region of the 16S rRNA gene was PCR-amplified from the extracted DNA and sequenced on an Illumina MiSeq instrument. Above-ground plant biomass was not affected by elevated [CO 2 ] at anthesis, but plants exposed to elevated [CO 2 ] had significantly higher grain yield. The composition of the rhizosphere prokaryotic communities was very similar under ambient and elevated [CO 2 ]. The dominant taxa were Bacteroidetes, Actinobacteria, Alpha-, Gamma-, and Betaproteobacteria. Elevated [CO 2 ] resulted in lower prokaryotic diversity in the rhizosphere, but did not cause a significant difference in community structure. © 2017 The Authors. MicrobiologyOpen published by John Wiley & Sons Ltd.

Ionization chamber for smoke detector and the like

International Nuclear Information System (INIS)

Rork, G.D.; Thorp, E.J.; Zegarski, R.J.

1985-01-01

This invention relates to detectors of the ionization type for detecting airborne particulate matter and, in particular, to the construction of an ionization chamber for such a detector. This invention may be used for detecting a variety of materials, such as dust, fog and the like, but is particularly useful for detecting combustion products such as smoke. The smoke detector ionization chamber has two electrodes connected to a source of electric power; means defining access openings for enabling air flow into and out of the chamber; and means for causing ionization within the chamber. It has control structure means within the chamber in the path of the airflow cooperating with the electrodes to establish within the chamber an electric field having a higher intensity close to the access openings and a lower intensity in the remainder of the chamber without significantly impairing the flow of neutral particles into the chamber. The control structure reduces airflow velocity within the chamber without adversely affecting the access of airborne particles to the chamber

Combined pars plana lensectomy-vitrectomy with open-loop flexible anterior chamber intraocular lens (AC IOL) implantation for subluxated lenses.

Science.gov (United States)

Kazemi, S; Wirostko, W J; Sinha, S; Mieler, W F; Koenig, S B; Sheth, B P

2000-01-01

To review our experience with combined pars plana lensectomy-vitrectomy and open-loop flexible anterior chamber intraocular lens (AC IOL) implantation for managing subluxated crystalline lenses. Retrospective review of 36 consecutive eyes (28 patients), all of which had subluxated crystalline lenses, managed by pars plana lensectomy-vitrectomy with insertion of an open-loop flexible AC IOL. The study was performed at the Medical College of Wisconsin, Milwaukee, over an 8-year period. An average preoperative visual acuity of 20/163 (range, 20/25 to hand motions) improved to 20/36 (range, 20/20 to 4/200) with surgery after a mean follow-up of 14 months (range, 1 to 59 months) (P IOL implantation appears to be an excellent technique for managing subluxated crystalline lenses. It is associated with a significant improvement in visual acuity (P subluxated lens through a limbal wound. Additionally, use of an AC IOL offers a simplified alternative to placement of a ciliary sulcus sutured posterior chamber intraocular lens (PC IOL).

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

Photodegradation of polyaromatic hydrocarbons in passive air samplers: Field testing different deployment chambers

International Nuclear Information System (INIS)

Bartkow, Michael E.; Kennedy, Karen E.; Huckins, James N.; Holling, Neil; Komarova, Tatiana; Mueller, Jochen F.

2006-01-01

Semi-permeable membrane devices (SPMDs) were loaded with deuterated anthracene and pyrene as performance reference compounds (PRCs) and deployed at a test site in four different chambers (open and closed box chamber, bowl chamber and cage chamber) for 29 days. The losses of PRCs and the uptake of polyaromatic hydrocarbons (PAHs) from the ambient air were quantified. UV-B levels measured in each deployment chamber indicated that SPMDs would be exposed to the most UV-B in the cage chamber and open box chamber. Significantly less PAHs were quantified in SPMDs deployed in the cage chamber and open box chamber compared to samplers from the other two chambers, suggesting that photodegradation of PAHs had occurred. The loss of PRCs confirmed these results but also showed that photodegradation was occurring in the closed box chamber. The bowl chamber appears to provide the best protection from the influence of direct photodegradation. - Photodegradation/loss of PAHs occurs from passive air samplers (SPMDs) deployed in various sampler chambers

MOOC - MASSIVE OPEN ONLINE COURSE: INSTALAÇÃO DO ANDROID STUDIO MOOC - Massive Open Online Course: Android Studio Installation

OpenAIRE

Moreira, Bernardo; Reguinga, Bernardo; Samartinho, João

2017-01-01

As tecnologias estão cada vez mais presentes no dia a dia. É crucial que os professores e alunos se sintam preparados para este novo universo tecnológico, onde as tecnologias assumem um papel preponderante no processo de ensino-aprendizagem.Este poster apresenta um projeto em que a partir de um MOOC (Massive Open Online Couse) disponibilizamos um módulo de instalação do Android Studio na plataforma eRaízes. A adesão a esta modalidade de aprendizagem (MOOC) e a crescente utilização do Android,...

A closed unventilated chamber for the measurement of transepidermal water loss.

Science.gov (United States)

Nuutinen, Jouni; Alanen, Esko; Autio, Pekka; Lahtinen, Marjo-Riitta; Harvima, Ilkka; Lahtinen, Tapani

2003-05-01

Open chamber systems for measuring transepidermal water loss (TEWL) have limitations related to ambient and body-induced airflows near the probe, probe size, measurement sites and angles, and measurement range. The aim of the present investigation was to develop a closed chamber system for the TEWL measurement without significant blocking of normal evaporation through the skin. Additionally, in order to use the evaporimeter to measure evaporation rates through other biological and non-biological specimens and in the field applications, a small portable, battery-operated device was a design criteria. A closed unventilated chamber (inner volume 2.0 cm(3) was constructed. For the skin measurement, the chamber with one side open (open surface area 1.0 cm(2) is placed on the skin. The skin application time was investigated at low and high evaporation rates in order to assess the blocking effect of the chamber on normal evaporation. From the rising linear part of the relative humidity (RH) in the chamber the slope was registered. The slope was calibrated into a TEWL value by evaporating water at different temperatures and measuring the water loss of heated samples with a laboratory scale. The closed chamber evaporation technique was compared with a conventional evaporimeter based on an open chamber method (DermaLab), Cortex Technology, Hadsund, Denmark). The reproducibility of the closed chamber method was measured with the water samples and with volar forearm and palm of the hand in 10 healthy volunteers. The skin application time varied between 7 and 9 s and the linear slope region between 3 and 5 s at the evaporation rates of 3-220 g/m(2) h. A correlation coefficient between the TEWL value from the closed chamber measurements and the readings of the laboratory scale was 0.99 (P measurements with the water samples was 4.0% at the evaporation rate of 40 g/m(2) h. A correlation coefficient of the TEWL values between the closed chamber and open chamber measurements was 0

Novas tecnologias no estudo de ondas sonoras

Directory of Open Access Journals (Sweden)

Marisa Almeida Cavalcante

2013-10-01

Full Text Available http://dx.doi.org/10.5007/2175-7941.2013v30n3p579 O presente trabalho propõe a construção de um Tubo de Kundt adaptado às novas tecnologias disponíveis para o ensino de física. Tem como principal objetivo utilizar a placa Arduino em experimentos didáticos envolvendo o estudo de ondas sonoras. O Arduino é uma placa de controle I/O baseada no micro-controlador Atmega (Atmel e foi projetado inicialmente para fins didáticos. O fato da linguagem de programação utilizada e hardware serem do tipo open source (código aberto possibilitou sua ampla difusão em diversas áreas. Uma das intenções deste projeto é difundir o uso deste recurso para fins educacionais e particularmente no estudo de ondas sonoras estacionarias em tubos, contribuindo com a melhora na abordagem deste conteúdo no ensino e aprendizagem de Física.

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.

Electronic system for the automation of current measurements produced by ionization chambers

International Nuclear Information System (INIS)

Brancaccio, Franco; Dias, Mauro da Silva

2002-01-01

Ionization Chambers in current mode operation are usually used in Nuclear Metrology in the determination of radionuclide activity. For this purpose measurements of very low ionization currents, in the range of 10 -8 to 10 -14 A, are required. Usually, electrometers perform the current integration method under command of signals from an automation system, in order to reduce the measurement uncertainties. In the present work, an automation system, developed for current integration measurements at the Laboratorio de Metrologia Nuclear (LMN) of Instituto de Pesquisas Energeticas e Nucleares (IPEN), is described. This automation system is composed by software (graphic interface and control) and an electronic module connected to a microcomputer, by means of a commercial data acquisition card CAD12/32 (LYNX Tecnologia Eletronica Ltda.). Measurements, using an electrometer Keithley 616 (Keithley Instruments, Inc) and an ionization chamber IG12/A20 (20 th Century Electronics Ltd.), were performed in order to check the system and for validating the project. (author)

Tecnologia, experiência e memória

Directory of Open Access Journals (Sweden)

Aécio Amaral Jr

2006-10-01

Full Text Available O artigo investiga a estruturação de uma nova cultura de memória, a qual inverte a lógica metafísica com que se pensou a relação entre tecnologia e experiência nas ciências sociais. Com as recentes tecnologias da vida e da informação, a concepção do corpo humano como algo que se constitui à margem de um aparato tecnológico declina em credibilidade. Com isso, um dos principais projetos da metafísica ocidental, a saber, a estruturação de um campo de experiência e conhecimento livre de suportes técnicos, malogra em seu humanismo tecnofóbico. A partir de uma apreciação do conto Memento Mori, de Jonathan Nolan, e do filme Amnésia, de Christopher Nolan, analiso a relação entre memória e escritura, corpo e arquivo na contemporaneidade. O objetivo é perceber as tensões e oscilações implícitas na tentativa de instauração de uma mnemotécnica pretensamente pós-humana ou pós-orgânica. Palavras-chave: tecnologia; experiência; memória; humanismo; pós-humanismo.

Chemical and physical transformations of organic aerosol from the photo-oxidation of open biomass burning emissions in an environmental chamber

Science.gov (United States)

C. J. Hennigan; M. A. Miracolo; G. J. Engelhart; A. A. May; A. A. Presto; T. Lee; A. P. Sullivan; G. R. McMeeking; H. Coe; C. E. Wold; W.-M. Hao; J. B. Gilman; W. C. Kuster; J. de Gouw; B. A. Schichtel; J. L. Collett; S. M. Kreidenweis; A. L. Robinson

2011-01-01

Smog chamber experiments were conducted to investigate the chemical and physical transformations of organic aerosol (OA) during photo-oxidation of open biomass burning emissions. The experiments were carried out at the US Forest Service Fire Science Laboratory as part of the third Fire Lab at Missoula Experiment (FLAME III). We investigated emissions from 12 different...

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.

Assessing plant response to ambient ozone: growth of young apple trees in open-top chambers and corresponding ambient air plots

International Nuclear Information System (INIS)

Manning, W.J.; Cooley, D.R.; Tuttle, A.F.; Frenkel, M.A.; Bergweiler, C.J.

2004-01-01

Open-top chambers (OTCs) and corresponding ambient air plots (AA) were used to assess the impact of ambient ozone on growth of newly planted apple trees at the Montague Field research center in Amherst, MA. Two-year-old apple trees (Malus domestica Borkh 'Rogers Red McIntosh') were planted in the ground in circular plots. Four of the plots were enclosed with OTCs where incoming air was charcoal-filtered (CF); four were enclosed with OTCs where incoming air was not charcoal-filtered (NF) and four were not enclosed, allowing access to ambient air conditions (AA). Conditions in both CF and NF OTCs resulted in increased tree growth and changed incidence of disease and arthropod pests, compared to trees in AA. As a result, we were not able to use the OTC method to assess the impact of ambient ozone on growth of young apple trees in Amherst, MA. - Capsule: Conditions in charcoal-filtered and non-filtered open-top chambers affected apple tree growth equally and prevented assessment of ambient ozone effects

Considerations for Conducting Plant Research in Open Atmosphere Chambers on ISS

Science.gov (United States)

Wheeler, Raymond; Hummerick, Mary; Graham, Thomas; Dixit, Anirudha; Massa, Gioia

The access to spaceflight and now the International Space Station has provided plant researchers a laboratory that is in continuous freefall (near weightlessness). As veteran spaceflight investigators know too well, research in space is difficult to conduct and the experiments are often confounded by secondary events. An example of this is the distribution of water and gases in rooting systems in µ-gravity. Since the water does not settle to the ”bottom” of the rooting media in space, there can be poor distribution and movement of water and oxygen, which in turn can stress the plants. This also creates challenges for conducting ground controls where the logical approach is to use the same volume of water as in space. But under 1-g, the water does settle to the bottom of the root zone, which leaves less in the upper profile of the rooting medium. In addition, some chambers such as the Russian Svet (on Mir), Lada (ISS), and NASA’s Veggie chamber were or are open to the cabin air. This simplifies the hardware development and allows the use of cabin air for cooling and supplying CO2 to the plants. Yet it also exposes the plants to the cabin air, which could have very high CO2 levels (e.g., 3000 to 6000 ppm), low humidity, and trace contaminants that might be below the limits for human concerns but could still affect plants. A known effect of these “super-elevated” CO2 levels on many dicot species is increased transpiration due to elevated stomatal conductance, both during the light and the dark cycles. Examples of these secondary effects will be discussed, along with potential approaches for conducting adequate ground controls.

Tecnologias e sistemas de tratamento para os dejetos da suinocultura

Directory of Open Access Journals (Sweden)

Leandro D. dos Santos

2015-03-01

Full Text Available A suinocultura caracteriza-se como uma atividade de alto impacto ambiental, devido a grande quantidade de dejetos com alta carga de poluentes, lançados no meio ambiente. No entanto, existem diversas tecnologias, e sistemas de tratamento, com a capacidade de reduzir o poder poluente dos dejetos da suinocultura. O presente trabalho tem como objetivo analisar as principais tecnologias e sistemas de tratamentos para os dejetos da suinocultura, presentes em publicações brasileiras. Os resultados obtidos nestas publicações apresentaram-se de certa forma satisfatórios em relação à redução da carga de poluentes dos efluentes da suinocultura. Entretanto, pouco se sabe sobre o comportamento da redução dos poluentes em função de parâmetros dimensionais e temporais das tecnologias ou dos sistemas de tratamento. Tal desconhecimento dificulta o dimensionamento de sistemas de tratamento, desconsiderando a relação existente entre investimento e redução do poder poluente dos dejetos. Dentro deste contexto, a modelagem e otimização de sistemas pode ser uma ferramenta muito útil para o dimensionamento de tecnologias e sistemas de tratamento de dejetos de suínos.

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.

USE OF GROWTH CHAMBERS FOR CABBAGE BREEDING

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L. L. Bondareva

2014-01-01

Full Text Available Use of the growth chambers for cabbage breeding allows the reducing of certain stages of the breeding process and the growing biennial varieties of cabbage in a one-year cycle. In these growth chambers, the nutritional conditions, temperature, and lighting of plants are under control; the open pollination is eliminated.

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.

Scale testing of a partially confined blast chamber

CSIR Research Space (South Africa)

Grundling, W

2012-10-01

Full Text Available in pressure readings. A scale model of the blast chamber, Emily, was constructed with the addition of a pendulum plate hanging concentrically covering 65% of the open area. PURPOSE OF SCALED BLAST CHAMBER The purpose of this particular test is to evaluate... PHASE Illustrated in Figure 3 and 4 are the results obtained during testing of the scaled blast chamber. In both cases the pressure dissipates over time, showing pulsating behaviour as the shockwaves reflect off the chamber walls. By looking...

Arte, Educação e Tecnologia: experiências Educativas

Directory of Open Access Journals (Sweden)

Rosângela Aparecida da Conceição

2011-05-01

Full Text Available Este trabalho tem como objetivo apresentar experimentos realizados no ensino da arte integrado às novas tecnologias, vislumbrando a articulação e interação entre os campos da Arte, Tecnologia e Educação. Desta forma, serão apresentados os resultados e a avaliação das oficinas, bem como sua estrutura metodológica e a problematização a partir das questões surgidas. 

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}.

[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).

Decontamination chamber for the maintenance of DUPIC nuclear fuel fabrication and process equipment

International Nuclear Information System (INIS)

Kim, K. H.; Park, J. J.; Yang, M. S.; Lee, H. H.; Shin, J. M.

2000-10-01

This report presents the decontamination chamber of being capable of decontaminating and maintaining DUPIC nuclear fuel fabrication equipment contaminated in use. The decontamination chamber is a closed room in which contaminated equipment can be isolated from a hot-cell, be decontaminated and be reparired. This chamber can prevent contamination from spreading over the hot-cell, and it can also be utilized as a part of the hot-cell after maintenance work. The developed decontamination chamber has mainly five sub-modules - a horizontal module for opening and closing a ceil of the chamber, a vertical module for opening and closing a side of the chamber, a subsidiary door module for enforcing the vertical opening/closing module, a rotary module for rotating contaminated equipment, and a grasping module for holding a decontamination device. Such sub-modules were integrated and installed in the M6 hot-cell of the IMEF at the KAERI. The mechanical design considerations of each modules and the arrangement with hot-cell facility, remote operation and manipulation of the decontamination chamber are also described

Decontamination chamber for the maintenance of DUPIC nuclear fuel fabrication and process equipment

Energy Technology Data Exchange (ETDEWEB)

Kim, K. H.; Park, J. J.; Yang, M. S.; Lee, H. H.; Shin, J. M

2000-10-01

This report presents the decontamination chamber of being capable of decontaminating and maintaining DUPIC nuclear fuel fabrication equipment contaminated in use. The decontamination chamber is a closed room in which contaminated equipment can be isolated from a hot-cell, be decontaminated and be reparired. This chamber can prevent contamination from spreading over the hot-cell, and it can also be utilized as a part of the hot-cell after maintenance work. The developed decontamination chamber has mainly five sub-modules - a horizontal module for opening and closing a ceil of the chamber, a vertical module for opening and closing a side of the chamber, a subsidiary door module for enforcing the vertical opening/closing module, a rotary module for rotating contaminated equipment, and a grasping module for holding a decontamination device. Such sub-modules were integrated and installed in the M6 hot-cell of the IMEF at the KAERI. The mechanical design considerations of each modules and the arrangement with hot-cell facility, remote operation and manipulation of the decontamination chamber are also described.

Metacognição e tecnologia educacional simbólica

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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.

O RACIOCÍNIO ESPACIAL NA ERA DAS TECNOLOGIAS INFORMACIONAIS

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Valdenildo Pedro da Silva

2007-12-01

Full Text Available No mundo contemporâneo, ou, mais precisamente, nesta era da informação instantânea e simultânea, o raciocínio geográfico tem se destacado e, simultaneamente, se alterado por meio de novos aspectos sociais e tecnológicos. O presente estudo foi realizado com dezenove docentes atuantes em vários cursos de formação de professor de geografia de instituições públicas e privadas de diversas regiões do Brasil. Esses docentes têm utilizado as novas tecnologias e/ou pesquisado e produzido trabalhos a respeito delas no ensino de geografia. Diante disso, perseguimos o estudo na busca de se responder a seguinte indagação: novas tecnologias e raciocínio espacial: mas o que isso tem a ver? As tecnologias atuais, como veículos de informações, não têm a finalidade de desenvolver o “saber pensar o espaço” ou de realizar o “raciocínio espacial”, mas mesmo sem essa finalidade as pessoas aprendem geografia, pensam com a mediação dessas tecnologias. O ensino de geografia contribuiu para a formação de diversas pessoas por meio do desenvolvimento do raciocínio espacial realizado em duas diferentes escalas, do local ao global, mostrando articulações entre os diversos níveis de abstração, desde o espaço do trabalho até sua inserção em uma sociedade que se internacionaliza de maneira acelerada.

Structural Analysis of Extended Plasma Focus Chamber

International Nuclear Information System (INIS)

Mohd Azhar Ahmad; Abdul Halim Baijan; Siti Aiasah Hashim

2016-01-01

Accelerator Development Centre (ADC) of Nuclear Malaysia intends to upgrade the plasma focus device. It involves the extension part placed on top of the existing plasma focus vacuum chamber. This extended vacuum chamber purposely to give an extra space in conducting experiments on the existing plasma focus chamber. The aim of upgrading the plasma focus device is to solve the limitation in research and analysis of sample due to its done in an open system that cause analysis of samples is limited and less optimal. This extended chamber was design in considering the ease of fabrication as well as durability of its structural. Thus, this paper discusses the structural analysis in term of pressure loading effect in extended chamber. (author)

Glaucoma anterior chamber morphometry based on optical Scheimpflug images.

Science.gov (United States)

Alonso, Ruiz Simonato; Ambrósio Junior, Renato; Paranhos Junior, Augusto; Sakata, Lisandro Massanori; Ventura, Marcelo Palis

2010-01-01

To compare the performance of gonioscopy and noncontact morphometry with anterior chamber tomography (High Resolution Pentacam - HR) using optical Scheimpflug images in the evaluation of the anterior chamber angle (ACA). Transversal study. 112 eyes from 74 subjects evaluated at the Glaucoma Department, Fluminense Federal University, underwent gonioscopy and Pentacam HR. Using gonioscopy, the ACA was graded using the Shaffer Classification (SC) by a single experienced examiner masked to the Pentacam HR findings. Narrow angle was determined in eyes in which the posterior trabecular meshwork could not be seen in two or more quadrants on non-indentation gonioscopy (SC Grade 2 or less). Pentacam HR images of the nasal and temporal quadrants were evaluated by custom software to automatically obtain anterior chamber measurements, such as: anterior chamber angle (ACA), anterior chamber volume (ACV) and anterior chamber depth (ACD). Based on gonioscopy results, 74 (60.07%) eyes of patients classified as open-angle (SC 3 and 4) and 38 (33.93%) eyes of patients classified as narrow-angle (SC 1 and 2). Noncontact morphometry with Scheimpflug images revealed a mean ACA of 39.20 ± 5.31 degrees for open-angle and 21.18 ± 7.98 degrees for narrow-angle. The open-angle group showed significant greater ACV and ACD values when compared to narrow-angle group (ACV of 193 ± 36 mm³ vs. 90 ± 25 mm³, respectively, p<0.001; and ACD of 3,09 ± 0,42 mm vs. 1,55 ± 0,64 mm, respectively, p<0.0001.). In screening eyes with open-angle and narrow-angle with the Pentacam ACA of 20º (SC Grade 2) using the ROC curves, the analysis showed 52.6% of sensitivity and 100% of specificity. The Pentacam showed ability in detecting eyes at risk for angle closure analyzing ACV and ACD.

"Flat-Fish" vacuum chamber for the ISR

CERN Multimedia

CERN PhotoLab

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.

Filosofia, tecnologia e tecnocracia: uma análise conceitual

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José Fernando de Morais Firmino

2015-06-01

Full Text Available Este artigo faz uma reflexão sobre os conceitos de Tecnologia e de Tecnocracia, a partir da ótica filosófica. Desenvolveu-se no contexto de um projeto de pesquisa, realizado por meio do Programa Institucional de Bolsas de Iniciação Científica para o Ensino Médio – PIBIC-EM no Instituto Federal de Educação, Ciência e Tecnologia da Paraíba – Câmpus Cajazeiras, encontrando-se em fase de conclusão. O objetivo do referido projeto é analisar e socializar discussões sobre a técnica e a tecnologia a partir de um viés filosófico. Salientase que o projeto foi desenvolvido por aluno de curso técnico integrado ao ensino médio, com o intuito de aproximação dos conceitos em questão. Optou-se pela investigação do tipo bibliográfica, a partir do diálogo com teóricos como Dusek, Lévy, Platão, entre outros. Com base na análise feita, chegou-se a alguns achados: primeiro, não se pode desconsiderar, na conceituação de técnica, características humanas, como a razão, a liberdade, a criatividade, o discernimento, a escolha e a ambição, aspectos necessários para facilitar a condição e o trabalho humano. Segundo, a técnica está amplamente ligada à tecnologia, pois aquela precede a criação desta e participa de sua utilização. E, por fim, o complexo sistema tecnocrático só pode de fato existir na presença constante das técnicas, mas compreende-se que o governante fundamentalmente tecnocrata é também, na verdade, um estudioso, um aluno. Para que tal governante exista, é necessária uma educação bem fundamentada e completa. Essa é exatamente a relação entre técnica, tecnologia e tecnocracia.

Performance of large open-top chambers for long-term field investigations of tree response to elevated carbon dioxide concentration

International Nuclear Information System (INIS)

Whitehead, D.; Hogan, K.P.; Rogers, G.N.D.; Byers, J.N.; Hunt, J.E.; McSeveny, T.M.; Hollinger, D.Y.; Dungan, R.J.; Earl, W.B.; Bourke, M.P.

1995-01-01

In preparation for an investigation of the effects of elevated carbondioxide (CO 2 ) concentration on the two tree species Pinus radiata D. Don and Nothofagus fusca (Hook. f. ) Oerst, the environmental conditions inside sixteen open-top chambers, of the design described by Heagle et al. (1989), were measured and compared with those outside. During a period in late summer, both air temperature and air saturation deficit were greater inside the chambers, with mean increases of 0.3 degreesC and 0.1 kPa, respectively. The increases were closely related to solar irradiance, reaching maximum differences for temperature and air saturation deficit of 4.3 degrees C and 0.8 kPa, respectively, when solar irradiance was greater than 1600 mu mol m -2 s -1 . The mean (± standard deviation) CO 2 concentrations for the ambient and elevated treatments were 362 ± 37 and 654 ± 69 mu mol mol -1 , respectively. However, the CO 2 concentration in the elevated treatment decreased as wind speed increased, owing to incursions of ambient air into the chambers. Transmittance of visible solar irradiance (400-700 nm) through the plastic wall material decreased by 7% after 1 year of exposure at the site. In cloudy conditions the mean transmittance of solar irradiance into the chambers was 81% and on clear days this decreased from 80% to 74% with increasing solar zenith angle. The ratio of diffuse to total solar irradiance in the chambers was 13% and 21% greater than that outside for cloudy and clear conditions, respectively. The implications of these differences on water use efficiency for the trees growing inside and outside the chamber are discussed. A cost effective system, built to separate the CO 2 required for the experiment from waste biogas, is described. This project is contributing to the Global Change and Terrestrial Ecosystems (GCTE) Core Research Programme by providing data on the long-term effects of elevated CO 2 concentration on the above and below-ground carbon balance for

Cultura digital: odisseia da tecnologia e da ciência

Directory of Open Access Journals (Sweden)

Joana Coeli Ribeiro Garcia

2011-12-01

Full Text Available Rememora a história da tecnologia, culminando na moderna cultura digital, associando-a a uma odisseia. Contextualiza a necessidade do homem de registrar seus conhecimentos para compartilhá-los com outras gerações, o que começou com o verbo, logo, a pedra, depois, a argila, a madeira, peles, papel e, enfim, o ciberespaço. Discorre sobre vantagens da tecnologia na cultura digital e contradições na aceitação do meio eletrônico, tais como as limitações digitais e a facilidade com que se realiza plágio e se burla o direito autoral. Apresenta o letramento digital como elemento para utilização das novas tecnologias e considera que as metáforas biblioteca, ciberespaço, cibercultura, cultura digital e hipertexto serviram de inspiração para o texto, assim como, a Odisseia de Homero, que conta a viagem de Ulisses, que percorre e conhece vários costumes e tormentas. A coexistência com as mudanças serve de vivência para os desafios ou o que ainda há por ser feito.

Análise comportamental por intermédio das tecnologias de Big Data

OpenAIRE

Daniel dos Santos Bernardo; Danilo Romualdo Borlone

2016-01-01

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...

O Uso da Tecnologia Educacional: Um Fazer Pedagógico no Cotidiano Escolar

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Flávia Cristina Machado

2017-10-01

Full Text Available O artigo mostra um experimento realizado no ensino médio de uma escola de Caxias do Sul, onde o objetivo era diminuir a resistência dos professores na utilização da tecnologia educacional. Foram selecionados cinco professores para participarem do experimento. A primeira etapa foi verificar como os professores utilizavam a tecnologia em suas aulas. Após, uma oficina foi realizada para incentivar o uso da tecnologia. Os professores utilizaram as ferramentas apresentadas na oficina em suas aulas. As ações realizadas mostraram novas tomadas de consciência e novas posturas diante de novos processos de formação.

Open-air ionisation chambers with walls of soft-tissue equivalent material for measuring photon doses

International Nuclear Information System (INIS)

Vialettes, H.; Anceau, J.C.; Grand, M.; Petit, G.

1968-01-01

The ionisation chambers presented in this report constitute a contribution to research into methods of carrying out correct determinations in the field of health physics. The use of a mixture of teflon containing 42.5 per cent by weight of carbon for the chamber walls makes it possible to measure directly the dose absorbed in air through 300 mg/cm 2 of soft tissue and, consequently, the dose absorbed in the soft tissues with a maximum error of 10 per cent for photon energies of between 10 keV and 10 MeV. Furthermore since this material does not contain hydrogen, the chamber has a sensitivity to neutrons which is much less than other chambers in current use. Finally the shape of these chambers has been studied with a view to obtaining a satisfactory measurement from the isotropy point of view; for example for gamma radiation of 27 keV, the 3 litre chamber is isotropic to within 10 per cent over 270 degrees, and the 12 litre chamber is isotropic to within 10 per cent over 300 degrees; for 1.25 MeV gamma radiation this range is extended over 330 degrees for the 3 litre chamber, and 360 degrees for the 12 litre chamber. This report presents the measurements carried out with these chambers as well as the results obtained. These results are then compared to those obtained with other chambers currently used in the field of health physics. (authors) [fr

Tilt, Decentration, and Internal Higher-Order Aberrations of Sutured Posterior-Chamber Intraocular Lenses in Patients with Open Globe Injuries

Directory of Open Access Journals (Sweden)

Xiangjia Zhu

2017-01-01

Full Text Available Purpose. To evaluate the tilt, decentration, and internal higher-order aberrations (HOAs of sutured posterior-chamber intraocular lenses (IOLs in patients with open globe injuries. Methods. 46 consecutive patients (47 eyes who underwent transsclerally sutured IOL implantation were enrolled in this prospective cohort study. Nineteen eyes had a history of open globe injury. The tilt and decentration of the IOLs and the visual quality were measured 1 month after surgery. Results. The horizontal tilt and decentration of the IOLs in the open-globe-injury group were significantly higher than those in the control group (both P<0.05. In the open-globe-injury group, the horizontal decentration was significantly greater in the limbus-sclera-involved group (n=11 than in the only-cornea-involved group (n=8, P=0.040. The internal coma, 3rd-order, and total HOA values at pupil sizes of 4 mm (P=0.006 and 6 mm (P=0.013 were significantly higher in the open-globe-injury group than in the controls. Consequently, the optical quality data for the modulation transfer function and the Strehl ratio (all P<0.05 were significantly poorer in the open-globe-injury group. Conclusions. Open globe injuries damage the structural integrity of the eyeball, resulting in more-misaligned sutured IOLs and poorer visual quality.

MOOC - Massive Open Online Course Instalação do Android Studio

OpenAIRE

Moreira, Bernardo; Reguinga, Bernardo; Samartinho, João

2017-01-01

As tecnologias estão cada vez mais presentes no dia a dia. É crucial que os professores e alunos se sintam preparados para este novo universo tecnológico, onde as tecnologias assumem um papel preponderante no processo de ensino-aprendizagem. Este poster apresenta um projeto em que a partir de um MOOC (Massive Open Online Couse) disponibilizamos um módulo de instalação do Android Studio na plataforma eRaízes. A adesão a esta modalidade de aprendizagem (MOOC) e a crescente utilização do Andr...

Tecnologia e implicações na educação

OpenAIRE

Locatelli, Odete Catarina

2009-01-01

Esse artigo trata das Tecnologias da Informação e Comunicação (TICs), das possibilidades inéditas na interação entre as pessoas em diferentes áreas, num mundo cada vez mais globalizado, e sua inserção em diversas áreas do conhecimento, especialmente na educação. A evolução das tecnologias desde a invenção da imprensa, passando pela criação dos microcomputadores e a internet gerou um desenvolvimento cognitivo e relacional que coloca a necessidade de se qualificar minimamente novosprofissionais...

Arte e tecnologia: intersecções

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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

Tranferência de tecnologia entre universidades e empresas : os casos UNICAMP-SP e UNISINOS-RS

OpenAIRE

Chais, Cassiane

2014-01-01

A universidade possui um histórico pautado na contribuição para avanço do conhecimento e da tecnologia no contexto econômico e social de um país, através do ensino, da pesquisa e da extensão. O conhecimento gerado por meio destas pesquisas entre alunos e pesquisadores pode ocasionar a interação com diferentes atores, entre eles governo e empresas, acarretando a transferência da tecnologia gerada na universidade para o mercado. A transferência de tecnologia pode ser considerada um processo que...

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...

Comparison of crop yield sensitivity to ozone between open-top chamber and free-air experiments.

Science.gov (United States)

Feng, Zhaozhong; Uddling, Johan; Tang, Haoye; Zhu, Jianguo; Kobayashi, Kazuhiko

2018-02-02

Assessments of the impacts of ozone (O 3 ) on regional and global food production are currently based on results from experiments using open-top chambers (OTCs). However, there are concerns that these impact estimates might be biased due to the environmental artifacts imposed by this enclosure system. In this study, we collated O 3 exposure and yield data for three major crop species-wheat, rice, and soybean-for which O 3 experiments have been conducted with OTCs as well as the ecologically more realistic free-air O 3 elevation (O 3 -FACE) exposure system; both within the same cultivation region and country. For all three crops, we found that the sensitivity of crop yield to the O 3 metric AOT40 (accumulated hourly O 3 exposure above a cut-off threshold concentration of 40 ppb) significantly differed between OTC and O 3 -FACE experiments. In wheat and rice, O 3 sensitivity was higher in O 3 -FACE than OTC experiments, while the opposite was the case for soybean. In all three crops, these differences could be linked to factors influencing stomatal conductance (manipulation of water inputs, passive chamber warming, and cultivar differences in gas exchange). Our study thus highlights the importance of accounting for factors that control stomatal O 3 flux when applying experimental data to assess O 3 impacts on crops at large spatial scales. © 2018 John Wiley & Sons Ltd.

HF production in CMS-Resistive Plate Chambers

International Nuclear Information System (INIS)

Abbrescia, M.; Colaleo, A.; Guida, R.; Iaselli, G.; Loddo, F.; Maggi, M.; Marangelli, B.; Natali, S.; Nuzzo, S.; Pugliese, G.; Ranieri, A.; Romano, F.; Trentadue, R.; Cavallo, N.; Fabozzi, F.; Paolucci, P.; Piccolo, D.; Polese, G.; Sciacca, C.; Belli, G.; Necchi, M.; Ratti, S.; Riccardi, C.; Torre, P.; Vitulo, P.; Anguelov, T.; Genchev, V.; Panev, B.; Piperov, S.; Sultanov, G.; Vankov, P.; Litov, L.; Pavlov, B.; Petkov, P.

2006-01-01

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 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

Monitoraggio in continuo di strutture e del territorio mediante la tecnologia GNSS

OpenAIRE

Poluzzi, Luca

2016-01-01

Al giorno d’oggi, la tecnologia GNSS può essere uno strumento utile, non solo in ambito di navigazione, ma anche per applicazioni di posizionamento di precisione come il monitoraggio di strutture o del territorio. Questa tecnica permette un controllo in continuo, anche da remoto, e ha un costo relativamente basso sia per quanto riguarda le strumentazioni che per gli aspetti di materializzazione e mantenimento. Nell’ottica di utilizzare la tecnologia GNSS per applicazioni di monitoraggio, il p...

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,

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.

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.

ANÁLISE PATENTOMÉTRICA DAS TECNOLOGIAS DE PROCESSO DA COMPANHIA SIDERÚRGICA NACIONAL (CSN

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Mariana Costa Fagundes

2016-06-01

Full Text Available Este artigo tem como objetivo traçar o perfil tecnológico dos processos produtivos da Companhia Siderúrgica Nacional (CSN. Para tanto, são analisados, por meio de um estudo patentométrico, os depósitos de pedido de patente ou modelo de utilidade da CSN, no período entre 1971 e 2009, classificando-os entre tecnologias de produto e tecnologias de processo. O estudo mostrou que 60% de tais depósitos relacionam-se a tecnologias de processo. Conclui-se que há uma forte diferença entre o padrão de patenteamento da CSN nos períodos pré e pós-privatização.

Results from beam tests of a 2.4 m straw chamber

International Nuclear Information System (INIS)

Cizeron, R.; Fournier, D.; Noppe, J.M.; Perdereau, O.; Schaffer, A.C.

1991-03-01

Straw chambers have been shown to have good position resolution. By virtue of their cylindrical geometry they are capable of operating in vacuum, which opens the interesting possibility of tracking with a minimum of material. The feasibility of constructing a large surface straw chamber has been studied. A prototype chamber with 2.4 m long straws capable of operating in vacuum has been developed and tested in beams at CERN

UM ESTUDO SOBRE AS HABILIDADES NECESSÁRIAS PARA UTILIZAÇÃO DAS TECNOLOGIAS DIGITAIS COMO RECURSO METODOLÓGICO

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Wender Antônio da Silva

2017-07-01

Full Text Available Este artigo busca entender, por meio de um levantamento de estado da arte, o que são as tecnologias digitais, qual a relação entre tecnologias digitais e a sociedade da informação, quais são os fatores sociais que acompanham a evolução tecnológica, como as tecnologias digitais estão sendo utilizadas nos processos educacionais e, quais são as habilidades necessárias para se trabalhar com metodologias de ensino envolvendo tecnologias digitais. Para isso propõe-se um debate sobre as tecnologias digitais no processo de ensino e aprendizado fazendo-se a relação entre a sociedade da informação e do conhecimento e as evoluções e revoluções do século XXI. Discute-se o conflito de gerações entre os nativos e imigrantes digitais, destacando a preocupante situação dos países emergentes com os excluídos digitais, que são também, excluídos sociais. Por fim, apresenta-se a atual situação da utilização das tecnologias educacionais como possibilidade de recurso metodológico.

Implantation of a new Beta Secondary Standard system at Centro de Desenvolvimento da Tecnologia Nuclear

International Nuclear Information System (INIS)

Reynaldo, Sibele Reis

2005-01-01

The crescent use of beta radiation sources in medical, industrial and research applications has increased the need for higher accuracy in beta dosimetry. As the first Beta Secondary Standard system (BSS1) was developed about 20 years ago, a new BSS2 system was made commercially available to fulfill new metrological demands and to follow the technological development. The BSS2 has a new positioning set-up, high activity and long half-life beta radiation sources and a special safety system. The Centro de Desenvolvimento da Tecnologia Nuclear is the first laboratory in Latin America that has got a BSS2. This work describes the BSS2 and it compares its advantages in relation to BSS1; results of the beam uniformity tests of the radiation fields from 90 Sr/ 90 Y, 85 Kr and 147 Pm sources, that were measured with an ionization chamber and with thermoluminescent detectors, are also shown. Results show that the beta radiation fields are considered to be uniform for diameters between 8 and 20 cm according to the chosen source. (author)

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.

Utilizing Chamber Data for Developing and Validating Climate Change Models

Science.gov (United States)

Monje, Oscar

2012-01-01

Controlled environment chambers (e.g. growth chambers, SPAR chambers, or open-top chambers) are useful for measuring plant ecosystem responses to climatic variables and CO2 that affect plant water relations. However, data from chambers was found to overestimate responses of C fluxes to CO2 enrichment. Chamber data may be confounded by numerous artifacts (e.g. sidelighting, edge effects, increased temperature and VPD, etc) and this limits what can be measured accurately. Chambers can be used to measure canopy level energy balance under controlled conditions and plant transpiration responses to CO2 concentration can be elucidated. However, these measurements cannot be used directly in model development or validation. The response of stomatal conductance to CO2 will be the same as in the field, but the measured response must be recalculated in such a manner to account for differences in aerodynamic conductance, temperature and VPD between the chamber and the field.

TECNOLOGIAS MÓVEIS: TABLETS E SMARTPHONES NO ENSINO DA MATEMÁTICA

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Raphael de Oliveira Freitas

2017-06-01

Full Text Available O presente artigo trata da utilização das tecnologias móveis (tablets e smartphones como recursos didáticos para a aprendizagem dos conteúdos matemáticos, a fim de observar como esses instrumentos podem contribuir para a formação inicial de professores que ensinarão Matemática no Ensino Fundamental. O estudo, de cunho exploratório, foi realizado com os alunos dos cursos de Pedagogia e da Licenciatura em Matemática e aqui apresentamos as análises dos dados coletados na oficina pedagógica realizada com um grupo de alunos composto por estudantes dos dois cursos. As análises dos dados sinalizaram para o interesse destes alunos sobre as possibilidades e limitações do uso das tecnologias móveis como recursos de ensino e aprendizagem dos conteúdos matemáticos por meio de aplicativos como o SAMD (Multiply e Desafio matemático. Observamos, ainda, que em boa parte da formação inicial desses alunos, faltam propostas que abordem as tecnologias móveis como recursos de aprendizagem matemática.

A Sobrecarga de Recursos de Tecnologias Móveis na Atividade de Gestão de Portfólio

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Carla Bonato Marcolin

2014-12-01

Full Text Available O ambiente organizacional está cada vez mais embebido em tecnologias, que proporcionam novas formas de interação entre indivíduos e entre empresas. As tecnologias móveis, posicionadas nesse ambiente, são tecnologias que transformam o cenário dos gestores, trazendo facilidades e desafios ao mesmo tempo. Analisar a participação destas tecnologias na vida gerencial é relevante para poder perceber como os gestores lidam com elementos emergentes da intensa integração de suas atividades com as tecnologias móveis e todas as suas possibilidades. Neste cenário, os gestores de portfólio financeiro lidam adicionalmente com uma transformação na sua profissão. A queda da rentabilidade do mercado de capitais fez com que uma série de produtos de investimentos proliferassem, exigindo desse profissional não apenas habilidades de operador, como também de gestor e aconselhador financeiro, para conseguir atrair e guiar seus clientes dentro de tantas novas opções disponíveis.  Por meio de um estudo com 11 gestores, procurou-se aprofundar em elementos a respeito da sobrecarga dos recursos de tecnologia móvel, e de como estes profissionais encaram as questões abordadas na sua rotina.

Nuclear design considerations for Z-IFE chambers

Energy Technology Data Exchange (ETDEWEB)

Meier, W.R. [Lawrence Livermore National Laboratory, P.O. Box 808, L-641, Livermore, CA 94551 (United States)]. E-mail: meier5@llnl.gov; Schmitt, R.C. [Bettis Atomic Power Laboratory, Pittsburgh, PA 15203 (United States); Abbott, R.P. [Lawrence Livermore National Laboratory, P.O. Box 808, L-641, Livermore, CA 94551 (United States); Latkowski, J.F. [Lawrence Livermore National Laboratory, P.O. Box 808, L-641, Livermore, CA 94551 (United States); Reyes, S. [Lawrence Livermore National Laboratory, P.O. Box 808, L-641, Livermore, CA 94551 (United States)

2006-02-15

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.

Tecnologia no cuidado de enfermagem: uma análise a partir do marco conceitual da Enfermagem Fundamental

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Rafael Celestino da Silva

2014-01-01

Full Text Available Pesquisa de campo, qualitativa, cujo objetivo foi discutir a aplicação de tecnologias no cuidado de enfermagem na terapia intensiva, tomando como referência o marco teórico-conceitual da Enfermagem Fundamental. Realizou-se observação e entrevista com vinte e dois enfermeiros de uma unidade de terapia intensiva, com análise etnográfica. A tecnologia, a partir do domínio de uma linguagem tecnológica, fornece condições para que os fundamentos do cuidado de enfermagem possam ser efetivamente incorporados à prática do enfermeiro. A ideia de desumanização ligada à tecnologia pode ser explicada pelo modo como o enfermeiro significa as coisas afetas ao seu cotidiano, o qual orientará sua ação. Conclui-se que as tecnologias ajudam a promover a vida e resgatar o humano.

Outdoor chamber measurements of biological aerosols with a passive FTIR spectrometer

Science.gov (United States)

D'Amico, Francis M.; Emge, Darren K.; Roelant, Geoffrey J.

2004-02-01

Outdoor measurements of dry bacillus subtilis (BG) spores were conducted with a passive Fourier transform infrared (FTIR) spectrometer using two types of chambers. One was a large open-ended cell, and the other was a canyon of similar dimensions. The canyon exposes the aerosol plume to downwelling sky radiance, while the open-ended cell does not. The goal of the experiments was to develop a suitable test methodology for evaluation of passive standoff detectors for open-air aerosol measurements. Dry BG aerosol particles were dispersed with a blower through an opening in the side of the chamber to create a pseudo-stationary plume, wind conditions permitting. Numerous trials were performed with the FTIR spectrometer positioned to view mountain, sky and mixed mountain-sky backgrounds. This paper will discuss the results of the FTIR measurements for BG and Kaolin dust releases.

Aprendizagem intergeracional com tecnologias de informação e comunicação

OpenAIRE

Patrício, Maria Raquel; Osório, António

2011-01-01

Aprendizagem Intergeracional com Tecnologias de Informação e Comunicação é um projecto de investigação na área das ciências da educação especialidade em tecnologia educativa. Este projecto destina-se a aprofundar o conhecimento sobre as relações intergeracionais e a desenvolver estratégias de aprendizagem intergeracional, suportadas pelas TIC em geral e pela Web 2.0 em particular.

O trabalho docente na rede pública estadual mineira em face dos discursos sobre as tecnologias educacionais

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Adelino Francklin

2017-12-01

Full Text Available Este artigo visa analisar a discrepância entre os discursos salvacionistas em favor do uso das tecnologias na Educação e o trabalho docente na Rede Pública Estadual de Minas Gerais (REE/MG. Justifica-se pelo aumento do número de discursos da Secretaria Estadual de Educação de Minas Gerais (SEE/MG, em entre os anos de 2003 a 2014, em favor do uso das tecnologias na Educação como necessidade para elevar a qualidade no ensino. Destarte, a SEE/MG adquiriu computadores, lousas digitais para as escolas da REE/MG e tablets educacionais para os professores que atuavam na mesma rede de ensino. Foram aplicados questionários e realizadas entrevistas semiestruturadas com cinco professores secundários de diferentes disciplinas que atuavam na REE/MG. A abordagem da pesquisa foi qualitativa. As análises apontam que houve ausência de formação continuada para o uso das tecnologias pelos professores da REE/MG; obstáculos para o uso das tecnologias na educação na REE/MG e que a SEE/MG adotou uma visão instrumentalista sobre as tecnologias na educação no contexto estudado.

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.

Novas tecnologias na aula de Matemática

OpenAIRE

Ponte, João Pedro da

1995-01-01

As novas tecnologias computacionais (NT) assumiram um papel de primeiro plano no ensino da Matemática na última década. Este artigo ilustra o partido que se pode tirar, em diferentes níveis de ensino, de materiais já perfeitamente testados, largamente disponíveis e susceptíveis de generalizada utilização.

Species-Specific Morphological and Physiological Responses of Four Korean Native Trees Species under Elevated CO2 Concentration using Open Top Chamber

Science.gov (United States)

Song, W.; Byeon, S.; Lee, H.; Lee, M.; Lim, H.; Kim, H. S.

2017-12-01

For the last three years, studies on the morphological and physiological characteristics were carried out for four tree species (Pinus densiflora, Quercus acutissima, Sorbus alnifolia and Fraxinus rhynchophylla) which are representative native species of Korea. We used a control site and three open top chambers (con, chamber 1, 2, and 3) which were exposed to ambient and two elevated CO2 concentration ([CO2]); the concentration were the ambient (400ppm) for control and chamber 1 and 1.4 times (560ppm) and 1.8 times (720 ppm) of the atmosphere for chamber 2 and 3, respectively. Leaf mass per area (LMA), stomatal size, density and area were examined to investigate the morphological changes of the trees. Among four species, F. rhynchophylla increased their LMA with increase of CO2 concentration. In addition, F. rhynchophylla showed the decrease of stomatal density significantly (p-value=0.02), while there was no difference in stoma size. These findings resulted in 25.5% and 38.7% decrease of stomata area per unit leaf area calculated by multiplying the size and density of the stomata. On the other hand, all 4 tree species were significantly increased in height and diameter growth with the elevated CO2. However, in the case of Q. acutissima, the increase in height growth was prominent. For physiological characteristics, the maximum photosynthetic rate was faster in the chambers exposed to high [CO2] than that in the control. However the rate of carboxylation and the electron transfer rate showed no particular tendency. The measurement of hydraulic conductivity (Ks, kg/m/s/Mpa) for Crataegus pinnatifida, increased as the [CO2] in the atmosphere increased, and the 50% Loss Conductance (Mpa) tended to increase slightly with the [CO2]. The correlation analysis between hydraulic conductivity and vulnerability to cavitation showed a strong negative correlation (P <0.05), which was unlike the general tendency.

A ciência e a tecnologia para os estudantes brasileiros : percepções

OpenAIRE

da Cunha, Marcia Borin

2013-01-01

Nos anos de 2010 e 2011 realizamos uma pesquisa nacional para verificar as percepções dos estudantes brasileiros sobre temas relacionados à ciência e tecnologia. Esta investigação buscou averiguar como os jovens em idade escolar (Ensino Médio) percebem a ciência e a tecnologia em suas vidas, considerando-se que estas percepções têm influencia na formação dos conceitos científicos escolares e na forma como os jovens relacionam-se com a ciência (Teoria Sociocultural de Vygotsky). Os resultados ...

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

RELAÇÕES DE GÊNERO, INFERTILIDADE E NOVAS TECNOLOGIAS REPRODUTIVAS

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Rosana Machin Barbosa

2000-01-01

Full Text Available O texto aborda as novas tecnologias reprodutivas (NTRs e a infertilidade através da experiência de mulheres e homens que buscaram uma gestação por meio dessas técnicas. Os relatos apresentados estão baseados em pesquisa realizada, durante o ano de 1998, em dois serviços voltados ao tratamento de situações de infertilidade: um público — Hospital Pérola Byington, em São Paulo, e outro privado — Cenafert (Centro de Endoscopia e Assistência à Fertilidade, em Brasília/DF. As NTRs são enfocadas no âmbito da tecnologia, da saúde reprodutiva e das relações entre os gêneros.

Ciberespaço e rituais: tecnologia, antropologia e criatividade

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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.

Using the Nova target chamber for high-yield targets

International Nuclear Information System (INIS)

Pitts, J.H.

1987-01-01

The existing 2.2-m-radius Nova aluminum target chamber, coated and lined with boron-seeded carbon shields, is proposed for use with 1000-MJ-yield targets in the next laser facility. The laser beam and diagnostic holes in the target chamber are left open and the desired 10 -2 Torr vacuum is maintained both inside and outside the target chamber; a larger target chamber room is the vacuum barrier to the atmosphere. The hole area available is three times that necessary to maintain a maximum fluence below 12 J/cm 2 on optics placed at a radius of 10 m. Maximum stress in the target chamber wall is 73 MPa, which complies with the intent of the ASME Pressure Vessel Code. However, shock waves passing through the inner carbon shield could cause it to comminute. We propose tests and analyses to ensure that the inner carbon shield survives the environment. 13 refs

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...

CO2 dose–response functions for wheat grain, protein and mineral yield based on FACE and open-top chamber experiments

International Nuclear Information System (INIS)

Pleijel, Håkan; Högy, Petra

2015-01-01

Data from three Swedish open-top chamber and four German FACE experiments were combined to derive response functions for elevated CO 2 (eCO 2 ) effects on Cd, Zn, Mn, protein, grain yield, grain mass and grain number of wheat. Grain yield and grain number were increased by ∼6% and ∼7%, respectively, per 100 ppm CO 2 ; the former effect was linked to plant nitrogen status. Grain mass was not influenced by eCO 2 , whereas Cd concentration was reduced. Unlike Zn, Mn and protein, effects on Cd yield were not related to effects on grain yield. Yields of Mn, Zn and (weakly) protein were positively affected by eCO 2 . For protein, grain yield, grain mass and grain number, the results were consistent among the FACE and OTC experiments. A key conclusion was that yields of essential nutrients were enhanced (Mn > Zn > protein), although less than grain yield, which would not be expected from a simple dilution model. - Highlights: • Grain yield and grain number were positively affected by 6–7% per 100 ppm CO 2 . • Yield stimulation by CO 2 was influenced by plant nitrogen status. • Cd concentration was reduced by elevated CO 2 . • Yields of Zn, Mn and protein were stimulated by CO 2 , but less than grain yield. • A simple dilution model did not explain effects on Zn, Mn and protein. - Yields of Zn, Mn and protein were stimulated less by elevated CO 2 than grain yield, while Cd yield and grain mass were unaffected, in wheat exposed in FACE and open-top chambers

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

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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.

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).

Making MUSIC: A multiple sampling ionization chamber

International Nuclear Information System (INIS)

Shumard, B.; Henderson, D.J.; Rehm, K.E.; Tang, X.D.

2007-01-01

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 (α, 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 (α, 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 (α, 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 (α, 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 (α, p) reaction to reach the anode segment below the reaction

Making MUSIC: A multiple sampling ionization chamber

Science.gov (United States)

Shumard, B.; Henderson, D. J.; Rehm, K. E.; Tang, X. D.

2007-08-01

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 (α, 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 (α, 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 (α, 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. × 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 (α, 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 (α, p) reaction to reach the anode segment below the reaction.

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.

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

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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.

Interface empresa-universidade e a gestão da tecnologia

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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.

Tecnologias Sociais, Biopolíticas e Biopoder: Reflexões Críticas

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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.

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

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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.  

Viagens em Troia com Freire:a tecnologia como um agente de emancipação

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Paulo Blikstein

Full Text Available Resumo A rápida penetração de novas tecnologias na escola constitui uma oportunidade para a disseminação da filosofia de dois importantes teóricos da educação: Seymour Papert e Paulo Freire. As tecnologias digitais possibilitam formas diversas e inovadoras de trabalhar, expressar e construir. Essa adaptabilidade camaleônica da mídia computacional promove diversidade epistemológica (TURKLE; PAPERT, 1991, criando um ambiente no qual os alunos, na sua própria voz, podem concretizar suas ideias e projetos com motivação e empenho. Este artigo descreve uma implementação conduzida em uma escola pública brasileira e gera uma série de princípios de design de ambientes Papert/Freireanos, analisando o empenho intelectual e emocional dos estudantes, suas trajetória de aprendizado e a complexidade de seus projetos, que variaram de robôs controlados por computador a filmes de ficção científica. O artigo discute um modelo de implementação com quatro componentes: primeiro, identificar um tema gerador relevante para a comunidade; segundo, partir da cultura e da experiência tecnológica da comunidade como base para a introdução de novas tecnologias; terceiro, deliberadamente usar uma abordagem de mídia mista, em que alta e baixa tecnologia coexistem; por fim, deslocar certos protocolos sociais e comportamentais considerados normais nas escolas, mesmo aqueles aparentemente irrelevantes para o ensino e a aprendizagem. Conclui-se que tal utilização de tecnologias expressivas pode ser um poderoso agente de emancipação à Paulo Freire e, em especial, em comunidades economicamente carentes.

Como pensar a tecnologia e os meios on-line na educação?

OpenAIRE

Freire, Eugênio Paccelli Aguiar

2012-01-01

Neste texto, parte da dissertação “construindo um modelo de referência à participação ativa dos sujeitos em projetos educativos em ambiente on-line”, propomos um modo de pensar a tecnologia própria da educação. Desconsiderando preceitos mercantis de valoração baseada estritamente na consideração de suas capacidades técnicas, apresentamos uma visão de consideração da tecnologia anexada primordialmente a seus desdobramentos sociais, articulando, assim, um pensamento sintonizado com os ideais de...

Livro de atas das I Jornadas Internacionais Online: educação, tecnologias e inovação

OpenAIRE

Barros, Daniela Melaré Vieira; Neves, Cláudia; Courela, Conceição; Seabra, Filipa; Oliveira, Isolina; Henriques, Susana; Moreira, J. António; Behar, Patrícia

2014-01-01

Iniciativa do Projeto Processos de Ensino, Tecnologias e Inovação As Atas das Jornadas Internacionais Online: Educação, Tecnologias e Inovação tem como objetivo dar a conhecer os resumos das comunicações apresentadas nas Jornadas. Esse encontro científico online organizado pelo Projeto (Processos de Educação Tecnologias e Inovação) PETI teve a colaboração do Laboratório de Educação a Distância e Elearning e do Departamento de Educação e Ensino a Distância da Universidade Aberta. A...

Flow Characteristics of Multi-circular Jet Plate in Premix Chamber of Air-Assist Atomizer for Burner System

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Amirnordin Shahrin Hisham

2016-01-01

Full Text Available The flow characteristics of multi-circular jet (MCJ plate in the premix chamber of an atomizer were investigated using Computational Fluid Dynamics. Multiphase volume of fluid behavior inside the chamber was determined via steady simulations. The Eulerian–Eulerian two-fluid approach was used for execution mixing of diesel fuel and air. Spray simulation using the discrete phase with injection was generated from the nozzle hole into the ambient atmosphere. The behavior of three MCJ plates in the premix chamber was studied numerically. Results illustrated that plate open area, Ae, influenced the turbulence inside the chamber. MCJ 3, which had the lowest open area, generated the highest flow velocity and turbulence kinetic energy compared with MCJ 1 and 2. The MCJ plates could increase the turbulence in the premix chamber and contribute to the combustion efficiency.

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...

Tecnologias e o ensino na área da Saúde

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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.

Consumo de produtos e serviços inovadores: aplicação do índice de prontidão para tecnologia

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Luciana Peixoto Santa Rita

2010-07-01

Full Text Available 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 resultados mostraram que lidar com tecnologia no trabalho e ter mais pessoas em casa usando tecnologia afeta a TRI do indivíduo. Como contribuição à academia, a pesquisa descreveu uma revisão e uma aplicação prática em relação ao fenômeno dos produtos de alta tecnologia e sua ligação com o processo de adoção.

Contribuições das tecnologias educacionais digitais no ensino de habilidades de enfermagem: revisão integrativa

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Maurício de Souza Silveira

2017-07-01

Full Text Available RESUMO Objetivo Analisar as contribuições da utilização de tecnologias educacionais digitais no ensino de habilidades de enfermagem. Método Revisão integrativa da literatura, com busca em cinco bases de dados no período de 2006 a 2015 com combinações dos descritores “educação em enfermagem”, “instrução por computador”, “tecnologia educacional” ou respectivos termos em inglês. Resultados Amostra de 30 artigos agrupados nas categorias temáticas “tecnologia na simulação com manequins”, “estímulo à aprendizagem” e “ensino de habilidades de enfermagem”. Identificou-se diferentes formatos de tecnologias educacionais digitais utilizadas no ensino de habilidades de Enfermagem, como vídeos, ambientes virtuais, aplicativos, hipertexto, jogos e simuladores com realidade virtual. Conclusões Esses materiais digitais colaboraram na aquisição de referencial teórico que subsidiam as práticas, dinamizam o ensino e possibilitam a utilização de métodos ativos de aprendizagem, rompendo com o ensino tradicional de demonstrar e repetir procedimentos.

Assesment of PM2.5 emission from corn stover burning determining in chamber combustion

Science.gov (United States)

Hafidawati; Lestari, P.; Sofyan, A.

2018-04-01

Chamber measurement were conducted to determine Particulate Matter (PM2.5) emission from open burning of corn straw at Garut District, West Java. The of this study is to estimate the concentration of PM2.5 for two types of corn (corncobs and cornstover) for five varieties (Bisma, P29, NK, Bisma, NW). Corn residues were collected and then burned in the chamber combustion. The chamber was designed to simulate the burning in the field, which was observed in the field experiment that meteorological condition was calm wind. The samples were collected using a minivol air sampler. The assessment results of PM2.5 concentrations (mg/m3) from open burning experiment in the chamber for five varieties of corn cobs (Bisma, P29, NK, Bisi, NW) was 9.187; 2.843; 7.409; 3.781; 1.895 respectively. Concentration for corn stover burn was 2.060; 5.283; 4.048; 5.306 and 5.697 respectively. Fluctuations in the value of concentration among these varieties reflect variations in combustion conditions (combustion efficiency) and other parameters including water content, biomass conditions and the meteorological conditions. The combustion efficiency (MCE) of the combustion chamber simulation of corncobs ia lower than the MCE of corn stover, that the concentration PM2.5 more emitted from the burning of corn stover. The results of this study presented provide useful information for the development of local emission factors for PM2.5 from open burning of corn stover in Indonesia.

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.)

Device for automatically operating cooling mode of water in a pressure suppression chamber

International Nuclear Information System (INIS)

Sato, Hideyuki.

1975-01-01

Object: To provide a system for removing residual heat in a reactor safety system, which can automatically cool water in a pressure suppression chamber when a load on a generator is cut off, so as not to scram the reactor. Structure: When a load cut-off signal is generated by means of rapid closure of a turbine regulating valve or due to the load unbalance relay of generator output, or the like, a sea water pump is started to fully open an outlet valve for the sea water pump, a heat exchanging inlet valve and a minimum crow valve and to fully close a heat exchanging bypass valve. In this manner, cooling water for the heat exchanger is secured to start the pump in the system for removing residual heat, and when the pump discharge pressure is in normal condition, the inlet valve in pressure suppression chamber and the spray valve in the pressure suppression chamber are fully opened to automatically cool water in the pressure suppression chamber. (Hanada, M.)

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.

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...

Blast from pressurized carbon dioxide released into a vented atmospheric chamber

Science.gov (United States)

Hansen, P. M.; Gaathaug, A. V.; Bjerketvedt, D.; Vaagsaether, K.

2018-03-01

This study describes the blast from pressurized carbon dioxide (CO2) released from a high-pressure reservoir into an openly vented atmospheric chamber. Small-scale experiments with pure vapor and liquid/vapor mixtures were conducted and compared with simulations. A motivation was to investigate the effects of vent size and liquid content on the peak overpressure and impulse response in the atmospheric chamber. The comparison of vapor-phase CO2 test results with simulations showed good agreement. This numerical code described single-phase gas dynamics inside a closed chamber, but did not model any phase transitions. Hence, the simulations described a vapor-only test into an unvented chamber. Nevertheless, the simulations reproduced the incident shock wave, the shock reflections, and the jet release inside the atmospheric chamber. The rapid phase transition did not contribute to the initial shock strength in the current test geometry. The evaporation rate was too low to contribute to the measured peak overpressure that was in the range of 15-20 kPa. The simulation results produced a calculated peak overpressure of 12 kPa. The liquid tests showed a significantly higher impulse compared to tests with pure vapor. Reducing the vent opening from 0.1 to 0.01 m2 resulted in a slightly higher impulse calculated at 100 ms. The influence of the vent area on the calculated impulse was significant in the vapor-phase tests, but not so clear in the liquid/vapor mixture tests.

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

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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.

ABORDAGENS SOCIOTÉCNICAS E OS ESTUDOS EM TECNOLOGIA SOCIAL

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José de Arimatéia Dias Valadão

2014-05-01

Full Text Available Este ensaio procura discutir as perspectivas sociotécnicas como base para o desenvolvimento teórico em tecnologia social (TS. Para subsidiar essa discussão foram analisadas a abordagem dos sistemas sociotécnicos elaborada inicialmente por Trist, Emery e colaboradores do Instituto Tavistock; a abordagem da adequação sociotécnica oriunda da perspectiva construtivista da tecnologia e a abordagem dos híbridos sociotécnicos proposta por Latour. O argumento central é que o desenvolvimento de TS deve considerar as tramas de relações, em que tanto os aspectos sociais como técnicos estão imbricados nas organizações, evitando as ênfases de cada corrente e considerando a mediação sociotécnica como principal unidade de análise nos estudos em TS. A motivação dessa discussão é que a aplicação das abordagens sociotécnicas, sem o equilíbrio aparente das mediações sociotécnicas, parece fazer das TS somente mais uma dentre muitas outras abordagens “alternativas”, como os próprios estudos na área têm criticado.

A gating grid driver for time projection chambers

Energy Technology Data Exchange (ETDEWEB)

Tangwancharoen, S.; Lynch, W.G.; Barney, J.; Estee, J. [National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 (United States); Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 (United States); Shane, R. [National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 (United States); Tsang, M.B., E-mail: tsang@nscl.msu.edu [National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 (United States); Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 (United States); Zhang, Y. [Department of Physics, Tsinghua University, Beijing 100084 (China); Isobe, T.; Kurata-Nishimura, M. [RIKEN Nishina Center, Hirosawa 2-1, Wako, Saitama 351-0198 (Japan); Murakami, T. [Department of Physics, Kyoto University, Kita-shirakawa, Kyoto 606–8502 (Japan); Xiao, Z.G. [Department of Physics, Tsinghua University, Beijing 100084 (China); Zhang, Y.F. [College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875 (China)

2017-05-01

A simple but novel driver system has been developed to operate the wire gating grid of a Time Projection Chamber (TPC). This system connects the wires of the gating grid to its driver via low impedance transmission lines. When the gating grid is open, all wires have the same voltage allowing drift electrons, produced by the ionization of the detector gas molecules, to pass through to the anode wires. When the grid is closed, the wires have alternating higher and lower voltages causing the drift electrons to terminate at the more positive wires. Rapid opening of the gating grid with low pickup noise is achieved by quickly shorting the positive and negative wires to attain the average bias potential with N-type and P-type MOSFET switches. The circuit analysis and simulation software SPICE shows that the driver restores the gating grid voltage to 90% of the opening voltage in less than 0.20 µs, for small values of the termination resistors. When tested in the experimental environment of a time projection chamber larger termination resistors were chosen so that the driver opens the gating grid in 0.35 µs. In each case, opening time is basically characterized by the RC constant given by the resistance of the switches and terminating resistors and the capacitance of the gating grid and its transmission line. By adding a second pair of N-type and P-type MOSFET switches, the gating grid is closed by restoring 99% of the original charges to the wires within 3 µs.

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.

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.

Gerenciamento da tecnologia da informação para tomada de decisão em supermercados

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Maria Conceição Melo Silva

2002-01-01

Full Text Available O presente artigo focaliza a utilização da tecnologia da informação como ferramenta de apoio à tomada de decisão pelo gerente/pro-prietário dos supermercados de Aracaju. Os objetivos do estudo são: analisar o estágio de informatização dos supermercados, o nível de automação comercial, as características da informação gerada pelo sistema de informação, o fluxo das informações e a avaliação/percepção desse processo pelos gerentes. Foi verificado que, apesar do uso da tecnologia da informação ser um instrumento básico para o apoio aos dirigentes no processo de tomada de decisão, essa tecnologia não representa ainda, na maioria dos estabelecimentos pesquisados, um instrumento estratégico e de diferencial competitivo.

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

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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.

CRITÉRIOS PARA DECISÕES SOBRE INCORPORAÇÃO DE TECNOLOGIAS EM SAÚDE NO BRASIL E NO MUNDO

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Viviane Cássia Pereira

2015-10-01

Full Text Available Com os crescentes gastos em saúde, muitos países estão adotando a ferramenta de Avaliação de Tecnologias em Saúde (ATS para auxiliar as suas decisões sobre introdução de novas tecnologias nos sistemas de saúde. No Brasil, a Comissão Nacional de Incorporação de Tecnologias no SUS (CONITEC é responsável por assessorar o Ministério da Saúde em suas atribuições relacionadas à incorporação, à exclusão ou à alteração de tecnologias em saúde pelo SUS. Com o objetivo de aprimorar o trabalho da CONITEC, foi realizada uma pesquisa na base de dados MEDLINE, com a finalidade de identificar os critérios utilizados em outros países no processo de ATS para embasar suas decisões de adoção de medicamentos, dispositivos médicos, testes diagnósticos e equipamentos médicos. Foram selecionados 9 artigos e foram avaliadas as experiências de ATS de 16 países que, em conjunto, reportaram o uso de aproximadamente 21 critérios relacionados ao impacto da doença, à tecnologia, às questões econômicas, à qualidade de evidência e às questões de equidade, éticas e sociais e organizacionais. Em seguida, 12 relatórios elaborados pela CONITEC foram avaliados quanto à presença ou não de informações relacionadas a esses critérios. Da mesma forma que nos países avaliados, as informações sobre efetividade, segurança e custo-efetividade são consideradas extremamente relevantes no processo de incorporação de tecnologias pela CONITEC. A seleção apropriada de critérios e a sistematização da ATS podem conferir maior objetividade, transparência e legitimidade ao processo de incorporação de tecnologias, contribuindo para a tomada de decisões mais consistentes. 

Uso Pessoal das Tecnologias no Trabalho: Motivadores e Efeitos à Distração Profissional

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Alexandre Cappellozza

2017-09-01

Full Text Available Apesar dos inúmeros benefícios que as Tecnologias de Informação (TI – proporcionam a seus usuários, os efeitos adversos da utilização indiscriminada dos dispositivos tecnológicos pessoais no ambiente de trabalho é um tema pouco explorado. Este estudo analisa os aspectos individuais motivadores do uso particular de Tecnologias de Informação no trabalho e a relação da Distração Digital como um componente significativo sobre a perda de atenção dos profissionais durante a execução de suas atividades. A pesquisa evidencia que os aspectos ligados à dependência tecnológica são as principais causas do Uso Pessoal das Tecnologias no ambiente de trabalho. Entre esses motivadores, a perda do Controle do Impulso de uso da TI é o fator mais significativo ao Uso Pessoal das Tecnologias em ambientes profissionais, comparada a outros fatores analisados. A pesquisa também revela que a Distração Digital provoca significativa perda de concentração dos profissionais e que a Utilização Pessoal da TI no ambiente de trabalho é reflexo direto da redução do Engajamento do profissional no seu trabalho. Além disso, o estudo revela que o uso particular das aplicações que promovem interação social não é subterfúgio dos profissionais que manifestaram fraco Suporte Social dos seus pares no local de atuação profissional.

Geometric optimization of microreactor chambers to increase the homogeneity of the velocity field

Science.gov (United States)

Pálovics, Péter; Ender, Ferenc; Rencz, Márta

2018-06-01

In this work microfluidic flow-through chambers are investigated. They are filled with magnetic nanoparticle (MNP) suspension in order to facilitate enzymatic reactions. The enzyme is immobilized on the surface of the MNPs. These reactions have been found to be flow rate dependent. To overcome this issue various chamber geometries have been examined and optimized geometries have been designed and tested experimentally. The investigation is supported with dedicated CFD simulations using the open source software OpenFOAM. The paper presents the theoretical background and the results of the simulations. The simulations have been verified with measurements and these too are presented in the paper.

Inteligência Artificial, Tecnologias Informacionais E Seus Possíveis Impactos Sobre As Ciências Sociais

OpenAIRE

Dwyer T.

2001-01-01

Este artigo analisa algumas possibilidades de transformação das Ciências Sociais e, de maneira mais específica, na Sociologia, levantadas a partir do desenvolvimento e uso, nessas ciências, de tecnologias informacionais. Nas sociedades contemporâneas o aprofundamento do uso destas novas tecnologias pode trazer importantes conseqüências para as Ciências Sociais afetando, potencialmente, o ensino, a pesquisa e a construção de teoria. No Brasil podemos ver que um número crescente de informações ...

Análise comportamental por intermédio das tecnologias de Big Data

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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.

Transferência de tecnologia entre a universidade e a indústria 10.5007/1518-2924.2005v10n20p54

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Maria do Rosário de Fátima Portela Cysne

2005-01-01

Full Text Available Abordagem conceitual de tecnologia, inovação tecnológica e de transferência de tecnologia entre universidade e indústria como transferência de conhecimento (tácito e codificado, como base teórica que permite incluir os serviços de informação como componente relevante para o sucesso da transferência. Análise do processo de transferência de tecnologia, dos mecanismos, dos atores envolvidos em sua execução e da complexidade de sua implantação.

Phakic iris-fixated intraocular lens placement in the anterior chamber: effects on aqueous flow.

Science.gov (United States)

Repetto, Rodolfo; Pralits, Jan O; Siggers, Jennifer H; Soleri, Paolo

2015-05-01

Phakic intraocular lenses (pIOLs) are used for correcting vision; in this paper we investigate the fluid dynamical effects of an iris-fixated lens in the anterior chamber. In particular, we focus on changes in the wall shear stress (WSS) on the cornea and iris, which could be responsible for endothelial and pigment cell loss, respectively, and also on the possible increase of the intraocular pressure, which is known to correlate with the incidence of secondary glaucoma. We use a mathematical model to study fluid flow in the anterior chamber in the presence of a pIOL. The governing equations are solved numerically using the open source software OpenFOAM. We use an idealized standard geometry for the anterior chamber and a realistic geometric description of the pIOL. We consider separately the main mechanisms that produce fluid flow in the anterior chamber. The numerical simulations allow us to obtain a detailed description of the velocity and pressure distribution in the anterior chamber, and indicated that implantation of the pIOL significantly modifies the fluid dynamics in the anterior chamber. However, lens implantation has negligible influence on the intraocular pressure and does not produce a significant increase of the shear stress on the cornea, while the shear stress on the iris, although increased, is not enough to cause detachment of cells. We conclude that alterations in the fluid dynamics in the anterior chamber as a result of lens implantation are unlikely to be the cause of medical complications associated with its use.

Avaliação de tecnologia em saúde: II. A análise de custo-efetividade

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Silvia Regina Secoli

2010-12-01

Full Text Available O advento de novas tecnologias na saúde causou impacto nos indicadores clínicos e econômicos. Os métodos de pesquisa que incorporam conceitos da economia da saúde e epidemiologia clínica permitem avaliar a eficiência de novas tecnologias, por exemplo, através da análise de custo-efetividade. Este é um instrumento de análise de valor das intervenções em saúde. A metodologia, análise de custo-efetividade, é condição determinante da moderna prática de cuidados à saúde, pois as opções terapêuticas hoje disponíveis no Sistema Único de Saúde (SUS ou no sistema de saúde suplementar do Brasil passam necessariamente por tal análise, logo o sistema de saúde bem como os profissionais da saúde são levados a reexaminar os benefícios e custos de suas ações para assegurar que haja incorporação das tecnologias mais eficientes. Neste segundo artigo sobre avaliação de tecnologia em saúde reviram-se os conceitos de análise de custo-efetividade, os passos envolvidos na sua execução e o método para a análise crítica dos resultados.

Fluorescent and high intensity discharge lamp use in chambers and greenhouses

Science.gov (United States)

Langhans, Robert W.

1994-01-01

Fluorescent and High Intensity Discharge lamps have opened up great opportunities for researchers to study plant growth under controlled environment conditions and for commercial growers to increase plant production during low/light periods. Specific technical qualities of fluorescent and HID lamps have been critically reviewed. I will direct my remarks to fluorescent and high intensity discharge (HID) lamps in growth chambers, growth rooms, and greenhouses. I will discuss the advantages and disadvantages of using each lamp in growth chambers, growth rooms and greenhouses.

Ionization chamber

International Nuclear Information System (INIS)

Jilbert, P.H.

1975-01-01

The invention concerns ionization chambers with particular reference to air-equivalent ionization chambers. In order to ensure that similar chambers have similar sensitivities and responses the surface of the chamber bounding the active volume carries a conducting material, which may be a colloidal graphite, arranged in the form of lines so that the area of the conducting material occupies only a small proportion of the area of said surface. (U.S.)

Gerenciamento da transferência internacional de tecnologia: estudo de caso na indústria têxtil brasileira

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Wagner Cezar Lucato

2015-03-01

Full Text Available A indústria têxtil brasileira tem enfrentado forte competição por parte de produtos importados a baixos preços da China e de outros países do Extremo Oriente. Para que possam manter a sua habilidade de competir no mercado local, as empresas têxteis brasileiras têm procurado adotar uma estratégia defensiva por meio da busca da diferenciação em seus produtos. Isso vem sendo obtido por meio do desenvolvimento de novos produtos de maior qualidade e de menor custo como decorrência da utilização de novas tecnologias em equipamentos de fabricação. De maneira geral, essas novas tecnologias têm sido transferidas para as empresas brasileiras por fabricantes internacionais de equipamentos têxteis. Assim, este artigo objetiva contribuir para aumentar a competitividade das indústrias têxteis brasileiras para enfrentar as difíceis condições atuais do mercado local por meio da adição de conhecimentos teóricos e de direcionamentos práticos que permitam a elas incrementar a efetividade de seus processos de transferência de tecnologia (TT. Para essa finalidade, realizou-se uma avaliação exploratória de quatro empresas produtoras de tecidos, nas quais tais projetos internacionais de TT tenham sido recentemente efetivados, utilizando-se como framework o modelo Stage-gate de transferência de tecnologia proposto por Jagoda, Maheshwari e Lonseth (2010. Como resultado dessa análise, foi possível identificar similaridades e dissimilaridades entre as práticas de transferência de tecnologia empregadas pelas quatro empresas avaliadas, bem como demonstrar que a utilização de um processo de TT, usando como referencial um modelo Stage-gate, poderia ser empregado para implementar melhorias significativas nas práticas de TT das empresas têxteis brasileiras e, com isso, auxiliá-las no seu árduo esforço para competir eficazmente contra as importações de baixo custo.

Tecnologia e Metodologia no Ensino de Inglês: Impactos da Globalização e da Internacionalização

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Kyria Rebeca Finardi

2014-07-01

Full Text Available http://dx.doi.org/10.5007/2175-8026.2014n66p239 O artigo reflete sobre o papel das tecnologias nas diversas metodologias de ensino de inglês e sobre o impacto da globalização e internacionalização na educação em geral e no ensino de inglês em especial. O estudo é baseado no pressuposto de que o acesso à informação e à tecnologia é necessário para a construção de capital social (WARSCHAUER, 2003 e que esse acesso exige algum conhecimento de inglês e letramento digital (FINARDI; PREBIANCA; MOMM, 2013. Partimos de uma revisão bibliográfica sobre o uso de metodologias no ensino de inglês e do papel das tecnologias nessas metodologias para propor que tanto a resistência a quanto o uso acrítico de tecnologias pode ter consequências negativas tanto para o desenvolvimento da proficiência em inglês quanto para o desenvolvimento social do Brasil. O estudo conclui que na era do pós método (BROWN, 2002; KUMARAVADIVELO, 2003 e da informação (LEVY, 1999 as tecnologias têm um papel relevante e crucial que deve ser considerado criticamente nas metodologias de ensino de línguas. O estudo sugere ainda que o uso informado de tecnologias e metodologias, aliado ao ensino de inglês como língua internacional são essenciais para alavancar o desenvolvimento e a internacionalização da educação no Brasil de forma crítica em relação aos efeitos da globalização.

Pós-modernidade e novas tecnologias no discurso do professor de língua

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Maria José R. Faria Coracini

2006-01-01

Full Text Available

Este texto pretende apresentar algumas reflexões em torno da identidade do professor, atravessada pelo discurso da pós modernidade na vertente que se apóia nas novas tecnologias como resultado do chamado progresso científico. Para este estudo, baseamo-nos nas teorias do discurso, na psicanálise e na filosofia derrideana, cuja tarefa é desconstruir o edifício logocêntrico da cultura ocidental. Depois de analisar 50 redações de professores, foi possível observar que coabitam crenças que remetem ao professor missionário e idealista e a mitificação das novas tecnologias como a solução para os problemas de método e de motivação. Chocam-se, assim, resistências ao passado e resistências às novas tecnologias, que perturbam a garantia do saber e, portanto, do poder do professor, enfatizando o saber do aluno. O desejo da tranqüilidade e do conforto da verdade e da totalidade, garantido pela Torre de Marfim, se fragiliza na insegurança e nas incertezas da Torre de Babel (reconstruída pela (pós-modernidade, em que vigoram a complexidade, a heterogeneidade e a impossibilidade de completude.

A tecnologia digital Blockchain: análise evolutiva e pragmática

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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.

A EVOLUÇÃO DA TECNOLOGIA DA INFORMAÇÂO (TI DENTRO DA ADMINISTRAÇÃO

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Joe Yukinori Katsurayama

2017-03-01

Full Text Available Buscamos relacionar a tecnologia e os paradigmas contemporâneos que hoje são de fundamental importância na rede empresarial e como neste contexto cotidiano essa questão é primordial para o desenvolvimento. O fenômeno da globalização mostra o quanto está modernizado a crescente expansão das mídias nas empresas atuais. Diante disto, o objetivo do estudo visa realizar um levantamento bibliográfico sobre a eficácia da Tecnologia da Informação na Administração. Para isto foram levantados estudos sobre a evolução desta tecnologia na base de dados Scielo, Google Acadêmico. Observou- se com o presente estudo que aos poucos as empresas foram se sensibilizando para a importância da informação na gestão de negócios. O conceito de TI engloba software, telecomunicações, automação, recursos multimídia, recursos de organização de dados, entre outros.

Observatório como instrumento de prospectiva estratégica para as Instituições de Ciência e Tecnologia (ICTs)

OpenAIRE

Schmidt, Nádia Solange; Silva, Christian Luiz da

2018-01-01

Resumo: Este artigo a presenta um modelo de Observatório para as Instituições de Ciência e Tecnologia (ICTs), que atuam junto às cadeias agropecuárias. O objetivo é utilizar um processo sistemático para vislumbrar a médio e longo prazo, o futuro da ciência e da tecnologia, identificando áreas estratégias de pesquisa e de tecnologias emergentes que se relacionam a benefícios econômicos e sociais. A principal forma de atuação do modelo proposto é a interação entre os pesquisadores e os atores d...

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.

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.

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.

Test chamber

NARCIS (Netherlands)

Leferink, Frank Bernardus Johannes

2009-01-01

A test chamber for measuring electromagnetic radiation emitted by an apparatus to be tested or for exposing an apparatus to be tested to an electromagnetic radiation field. The test chamber includes a reverberation chamber made of a conductive tent fabric. To create a statistically uniform field in

A ciência e a tecnologia n’A Capital: da página de fait-divers à página de ciência

OpenAIRE

Fonseca, Rui Brito

2009-01-01

Durante muito tempo, a ciência e a tecnologia foram olhadas, pela população em geral, como mais um tema de entretenimento e curiosidade, a par de outros. Para a imprensa portuguesa, mormente a imprensa de cariz “popular”, a ciência e a tecnologia também foram durante algum tempo olhadas como um assunto de entretenimento e curiosidade. Partindo da análise, quantitativa e qualitativa, de cerca de 2000 artigos sobre ciência e tecnologia, publicados no jornal diário, pago e de c...

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.

Goniodysgenesis in familial primary open-angle glaucoma

NARCIS (Netherlands)

Verbraak, F. D.; vd Berg, W.; Delleman, J. W.; Greve, E. L.

1994-01-01

Results of a pilot study to evaluate goniodysgenesis as a cause of familial open-angle glaucoma are reported. Patients with a familial high tension open-angle glaucoma and a goniodysgenetic chamber angle (n = 11), a number of their relatives with glaucoma (n = 12), and their relatives without

Tecnologia de identificação por radiofreqüência: fundamentos e aplicações em automação de bibliotecas 10.5007/1518-2924.2007v12n24p182

Directory of Open Access Journals (Sweden)

Angel Freddy Godoy Viera

2007-12-01

Full Text Available A tecnologia de identificação por radiofreqüência (RFID é a mais nova tecnologia que, de forma acelerada, está sendo introduzida nas principais bibliotecas do mundo para a gestão eletrônica do acervo e implementação de serviços de auto-atendimento, entre outros serviços. Este artigo tem por objetivo apresentar os princípios de funcionamento da tecnologia RFID, seus componentes, as barreiras na adoção desta tecnologia e exemplos de iniciativas de implementação em bibliotecas. A metodologia utilizada foi a pesquisa bibliográfica e documental sobre a tecnologia RFID com aplicação em bibliotecas. Os resultados do trabalho mostram que esta tecnologia está se expandindo cada vez mais em nível mundial, no âmbito das bibliotecas. Conclui-se que a tecnologia RFID é uma das tecnologias de automação de bibliotecas que deve ser considerada na gestão eletrônica do acervo, tendo em vista às grandes vantagens que oferece.

Ética, ciência e tecnologia

Directory of Open Access Journals (Sweden)

Ivan Domingues

2004-06-01

Full Text Available O artigo visa pensar a relação entre ética, ciência e tecnologia, enfatizando o problema de sua revinculação depois da cisão entre os juízos de fato e os juízos de valor, ocorrida no início dos tempos modernos. Uma vez examinada a ética da aristocracia guerreira e a moral do santo, procura-se delinear o caminho tomando como referência a ética da responsabilidade, cujo protótipo é a moral do sábio, desaparecido no curso dos tempos modernos, em razão da fragmentação do saber e do advento do especialista. Ao fim do estudo, é discutida a relação entre a ética e a metafísica, com o intuito de ajustar a questão antropológica à perspectiva cosmológica, bem como de fornecer as bases de um novo humanismo, objetivando a humanização da técnica e a geração de um novo homem, alfabetizado em ciência, tecnologia e humanidades.The article aims at thinking the relation among ethics, science and technology, emphasizing the problem of their re-tying, after the division into judgments of fact and judgments of value, wich happened in the begininning of modern times. Since the warlike aristocracy's ethics and the saint man's moral are examined, it tries to outline its way, taking as a reference the ethics of responsability, whose prototype is the wise man's moral, which disappeared in the course of modern times, due to the fragmentation of knowing and the advent of the specialist. At the end of the study, the relationship between ethics and metaphysics is discussed, aiming at adjusting the anthropological question to the cosmological perspective, as well as at providing the bases of a new humanism, objectifying the humanization of the technique and the generation of a new man, literate at science, technology and the humanities.

Tecnologia e forças competitivas: estudo de caso sobre o VoIP em uma concessionária de telecomunicações

Directory of Open Access Journals (Sweden)

Renato de Oliveira Moraes

2010-06-01

Full Text Available O presente artigo analisa a influência da tecnologia de Voz sobre IP (VoIP nas posições estratégicas, sob a perspectiva da CTBC, utilizando-se da tipologia de Porter. A análise dos dados demonstra que os clientes adquiriram maior poder de barganha, quando se soma a tecnologia VoIP ao surgimento de novos concorrentes do setor de provedores de conteúdos, impulsionando a empresa a realizar alianças com esses provedores. Foi identificado, também, o surgimento de produtos substitutos oferecidos por concorrentes que adquirem a tecnologia de banda larga da própria empresa. Entretanto, esses produtos não interferem significativamente na rentabilidade da empresa, atualmente. Uma última análise aponta que, para clientes residenciais, a tecnologia impactou diretamente na rentabilidade da empresa na telefonia fixa, tendo como principal fator, o aumento das vendas de acesso à Internet por banda larga e o conseqüente aumento da utilização do VoIP por meios não pagos. Pôde-se identificar, com bom grau de clareza, que a tecnologia VoIP para a CTBC é uma questão de sobrevivência futura, possuindo potencialidades para rentabilidade em médio e longo prazos, não representando, porém, diferencial estratégico imediato.

Estudi de la viabilitat tecno-econòmica de la tecnologia de les basses solars. Estudi de cas: Bassa solar d'Escúzar, Granada

OpenAIRE

Mañé Gómez, Núria

2014-01-01

En aquest projecte es realitza un estudi sobre la viabilitat tecno-econòmica de la tecnologia de les basses solars. Aquesta tecnologia consisteix en la captació d’energia solar per al posterior emmagatzematge i aprofitament d’energia tèrmica a través d’una solució aquosa de sal. Per tant, és una tecnologia completament renovable i adequada per a aquelles industries que requereixin energia tèrmica a baixa temperatura. Prèviament es realitza una recerca sobre les basses solars, tant a nivell te...

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.

Visualization study of helium-air counter flow through a small opening

International Nuclear Information System (INIS)

Fumizawa, Motoo

2007-01-01

Buoyancy-driven counter flows of helium-air were investigated through horizontal and inclined small openings. Counter flows may occur following a window opening as ventilation, fire in the room as well as a pipe rupture accident in a high temperature gas-cooled nuclear reactor. The experiment has carried out by a test chamber filled with helium and flow was visualized by the smoke wire method. The flow behavior has recorded by a high-speed camera with a computer system. The image of the flow was transferred to the digital data, thus the flow velocity was measured by PTV software. The mass fraction in the test chamber was measured by electronic balance. The detected data was arranged by the densimetric Floude number of the counter flow rate that derived from the dimensional analysis. The method of mass increment was developed and applied to measure the counter flow rate. By removing the cover plate placed on the top of the opening, the counter flow initiated. Air enters the test chamber and the mass of the gas mixture in the test chamber increased. The volumetric counter flow rate was evaluated from the mass increment data. In the case of inclination openings, the results of both methods were compared. The inclination angle for maximum densimetric Floude number decreased with increasing length-to-diameter ratio of the opening. For a horizontal opening, the results from the method of mass increment agreed with those obtained by other authors for a water-brine system. (author)

Reliability of Eustachian tube function measurements in a hypobaric and hyperbaric pressure chamber.

Science.gov (United States)

Meyer, M F; Jansen, S; Mordkovich, O; Hüttenbrink, K-B; Beutner, D

2017-12-01

Measurement of the Eustachian tube (ET) function is a challenge. The demand for a precise and meaningful diagnostic tool increases-especially because more and more operative therapies are being offered without objective evidence. The measurement of the ET function by continuous impedance recording in a pressure chamber is an established method, although the reliability of the measurements is still unclear. Twenty-five participants (50 ears) were exposed to phases of compression and decompression in a hypo- and hyperbaric pressure chamber. The ET function reflecting parameters-ET opening pressure (ETOP), ET opening duration (ETOD) and ET opening frequency (ETOF)-were determined under exactly the same preconditions three times in a row. The intraclass correlation coefficient (ICC) and Bland and Altman plot were used to assess test-retest reliability. ICCs revealed a high correlation for ETOP and ETOF in phases of decompression (passive equalisation) as well as ETOD and ETOP in phases of compression (active induced equalisation). Very high correlation could be shown for ETOD in decompression and ETOF in compression phases. The Bland and Altman graphs could show that measurements provide results within a 95 % confidence interval in compression and decompression phases. We conclude that measurements in a pressure chamber are a very valuable tool in terms of estimating the ET opening and closing function. Measurements show some variance comparing participants, but provide reliable results within a 95 % confidence interval in retest. This study is the basis for enabling efficacy measurements of ET treatment modalities. © 2017 John Wiley & Sons Ltd.

North American International Society for Microbial Electrochemical Technologies Meeting (Abstracts)

Science.gov (United States)

2016-04-18

electrode interface in Shewanella oneidensis MR-1 Catarina Paquete1, Bruno Fonseca1, Ricardo O. Louro1 1 Instituto de Tecnologia Química e Biológica...response to anodic pH variation in a dual chamber microbial fuel cell Valentina Margaria, Instituto Italiano di Tecnologia , Italy 2-15 Microbial...SnO2 nanostructured composite for cathode oxygen reduction reaction in microbial fuel cells Adriano Sacco, Instituto Italiano di Tecnologia , Italy 2

Tecnologias gerenciais, educação e capital

OpenAIRE

Mueller, Rafael Rodrigo

2013-01-01

O objetivo de nosso artigo é analisar as tecnologias gerenciais e sua relação histórica com a educação. Para tanto, torna-se imprescindível verificarmos a relação existente entre os métodos e técnicas de treinamento desenvolvidos nos Estados Unidos por Charles Allen, em 1919, que foram intensificados com base no que ficou conhecido como "treinamento dentro da indústria" ou Training Within Industry (TWI), em 1940, e evoluíram após a Segunda Guerra Mundial, e o que se caracterizou como "gerenci...

Interação e tecnologia ao serviço da moda : the virtual interface kinect interaction

OpenAIRE

Fernandes, Clara Eloise

2013-01-01

Quando em 2010 a empresa Microsoft apresentou o sensor Kinect, apostando na tecnologia que permite o reconhecimento de movimentos à distância, depressa se percebeu que este poderia ser utilizado em muitas áreas que em nada têm que ver com os videojogos. O sector da moda em geral e o comércio de roupa em particular são um dos principais campos onde a aposta nas novas tecnologias têm sido considerável, sobretudo como forma de aumentar o número de vendas através da Internet. É nes...

O comunicador organizacional e a interface da comunicação com a área de tecnologias da informação

Directory of Open Access Journals (Sweden)

Viviane Fushimi Velloso

2015-07-01

Full Text Available No contexto das tecnologias da informação e a crescente dependência das aplicações tecnológicas no ambiente organizacional e dos negócios, verificou-se a necessidade de compreender como o profissional de comunicação organizacional percebe essa realidade. Por isso, por meio de uma pesquisa quantitativa, com metodologia “snowball” para aplicação de questionários, buscou-se traçar o perfil de formação e atuação desses profissionais nas organizações, bem como identificar o tipo de interação e expectativas que apresentam com a área de tecnologias da informação. A investigação possibilitou identificar as habilidades dos profissionais de comunicação organizacional, sua visão sobre a interação com a área de Tecnologias da Informação e detectar a necessidade de aprofundamento sobre a realidade desse profissional de tecnologia, que impacta a realidade das organizações.

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. Published by Elsevier Ireland Ltd.

Drift chamber

International Nuclear Information System (INIS)

Inagaki, Yosuke

1977-01-01

Drift chamber is becoming an important detector in high energy physics as a precision and fast position detector because of its high spatial resolution and count-rate. The basic principle is that it utilizes the drift at constant speed of electrons ionized along the tracks of charged particles towards the anode wire in the nearly uniform electric field. The method of measuring drift time includes the analog and digital ones. This report describes about the construction of and the application of electric field to the drift chamber, mathematical analysis on the electric field and equipotential curve, derivation of spatial resolution and the factor for its determination, and selection of gas to be used. The performance test of the chamber was carried out using a small test chamber, the collimated β source of Sr-90, and 500 MeV/C electron beam from the 1.3 GeV electron synchrotron in the Institute of Nuclear Study, University of Tokyo. Most chambers to date adopted one dimensional read-out, but it is very advantageous if the two dimensional read-out is feasible with one chamber when the resolution in that direction is low. The typical methods of delay line and charge division for two dimensional read-out are described. The development of digital read-out system is underway, which can process the signal of a large scale drift chamber at high speed. (Wakatsuki, Y.)

Multiple chamber ionization detector

International Nuclear Information System (INIS)

Solomon, E.E.

1980-01-01

A multi-chambered ionisation detector enables the amount of radiation entering each chamber from a single radioactive, eg β, source to be varied by altering the proportion of the source protruding into each chamber. Electrodes define chambers and an extended radioactive source is movable to alter the source length in each chamber. Alternatively, the source is fixed relative to outer electrodes but the central electrode may be adjusted by an attached support altering the chamber dimensions and hence the length of source in each. Also disclosed are a centrally mounted source tiltable towards one or other chamber and a central electrode tiltable to alter chamber dimensions. (U.K.)

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...

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

Open charcoal chamber method for mass measurements of radon exhalation rate from soil surface

International Nuclear Information System (INIS)

Tsapalov, Andrey; Kovler, Konstantin; Miklyaev, Peter

2016-01-01

Radon exhalation rate from the soil surface can serve as an important criterion in the evaluation of radon hazard of the land. Recently published international standard ISO 11665-7 (2012) is based on the accumulation of radon gas in a closed container. At the same time since 1998 in Russia, as a part of engineering and environmental studies for the construction, radon flux measurements are made using an open charcoal chamber for a sampling duration of 3–5 h. This method has a well-defined metrological justification and was tested in both favorable and unfavorable conditions. The article describes the characteristics of the method, as well as the means of sampling and measurement of the activity of radon absorbed. The results of the metrological study suggest that regardless of the sampling conditions (weather, the mechanism and rate of radon transport in the soil, soil properties and conditions), uncertainty of method does not exceed 20%, while the combined standard uncertainty of radon exhalation rate measured from the soil surface does not exceed 30%. The results of the daily measurements of radon exhalation rate from the soil surface at the experimental site during one year are reported. - Highlights: • Radon exhalation rate from the soil surface area of 32 cm"2 can be measured at level of 10 mBq/(m"2s) at the uncertainty ≤30%. • The method has a metrological justification. • No need to consider climate conditions, soil properties and conditions, mechanism and rate of radon transport in the soil.

New gas mixtures for Resistive Plate Chambers operated in avalanche mode

Energy Technology Data Exchange (ETDEWEB)

Abbrescia, M [Dipartimento Interateneo di Fisica, Universita di Bari and sezione INFN, via Amendola 173, I-70126 Bari (Italy); Cassano, V; Nuzzo, S; Piscitelli, G; Vadruccio, D; Zaza, S [Dipartimento Interateneo di Fisica, Universita di Bari and sezione INFN, via Amendola 173, I-70126 Bari (Italy)

2012-01-01

The possibility of using gas mixtures containing Helium, to overcome some of the problems encountered with standard gas mixture employed up to now for Resistive Plate Chambers, is studied here. New and interesting experimental results are reported, opening a possible original path of investigation in this field.

As tecnologias de informação e comunicação como prática de inclusão na EJA

Directory of Open Access Journals (Sweden)

Fabio Junior Silva dos Santos

2013-12-01

Full Text Available O presente artigo objetiva refletir sobre a possibilidade de as tecnologias da informação e comunicação tornarem-se instrumento de inclusão na Educação de Jovens e Adultos. Para fundamentar as abordagens foram realizadas pesquisas bibliográficas a partir da temática em foco, as quais subsidiaram a elaboração de uma proposta de ações pedagógicas no âmbito escolar, voltado para a utilização das tecnologias em sala de aula como recurso didático que maximiza a inclusão social, por via da inclusão digital. Didaticamente o trabalho apresenta-se, inicialmente com uma nota introdutória, na sequência faz uma abordagem histórica sobre a inserção da tecnologia na educação. Aborda, ainda, sobre as tecnologias de informação e comunicação e a educação, e apresenta a proposta de um trabalho prático envolvendo o uso da tecnologia como recurso educativo e prática de cidadania, visando, assim, contribuir com a inclusão de alunos matriculados na educação de jovens e adultos. Finaliza-se o artigo com algumas considerações sobre a realização do trabalho e o seu papel social e educacional

Improvement in a degassing chamber with continuous operation and arrangement for distillation sublimation, etc

Energy Technology Data Exchange (ETDEWEB)

Lurmann, F

1881-05-25

The degassing chambers shown in Patent 13,021 are combined with a receiver. Through arrangement of more roomy sucking openings for the distillation products, a continual partial recovery of the coke oven gases rich in different valuable constituents is attained. Arches lie over the degassing chamber and extend to the gas-burning rooms; to prevent their burning through. They remain directly in communication with the atmosphere and are on the top of the gasification room above the final arches. The charging of the various degassing rooms can be carried out by the usual charging apparatus, which runs lengthwise on rails on the degassing chambers.

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.

TECNOLOGIAS DA INFORMAÇÃO E COMUNICAÇÃO: FERRAMENTAS CONTRA MODISMOS?

Directory of Open Access Journals (Sweden)

Geralda P. Paulista dos Santos

2016-11-01

Full Text Available Análises de fracasso das abordagens de gestão mostram que várias propostas teórico-metodológicas que pretenderam dar solução de sobrevivência e competitividade às organizações foram relegadas à categoria de modismos. Este artigo apresenta a dinâmica de interação das equipes de trabalho como fator crítico para o desempenho das organizações e da gestão do conhecimento. Seu objetivo é propor que as tecnologias da informação e comunicação - TICs, ofereçam ferramental para medição e controle dessas interações, solidificando a gestão do conhecimento. A pesquisa é bibliográfica e o aporte teórico para a análise é o Modelo de Meta Learning, baseado nas teorias do caos e da complexidade. Palavras-chave: Gestão do conhecimento. Tecnologias. Informação. Comunicação. Caos. Complexidade. Interação. Conectividade.

O ENSINO DA FILOSOFIA COMO UMA TECNOLOGIA DE GOVERNAMENTALIDADE

OpenAIRE

Oliveira, Liliana Souza de

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 ...

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

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.

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.

Study of pulp chamber morphology of primary mandibular molars using spiral computed tomography.

Science.gov (United States)

Selvakumar, Haridoss; Kavitha, Swaminathan; Vijayakumar, Rajendran; Eapen, Thomas; Bharathan, Rajendran

2014-11-01

The purpose of this study was to evaluate the pulp chamber morphology in primary mandibular molars using spiral computed tomography (SCT). Sixty extracted primary mandibular molars were scanned using SCT for the (i) distance between the central fissure to furcation, (ii) distance between the central fissure to the floor of the pulp chamber, (iii) height of the pulp chamber (roof-floor), (iv) distance between the floor of the pulp chamber to the furcation. The mean and standard deviation was analyzed using statistical package for the social sciences (SPSS) program. The results of this study show that the average mean distance from the central fissure to the floor of the pulp chamber is 5.07 mm in first mandibular primary molar and 5.54 mm in second mandibular primary molar. It can be concluded that the greatest depth to which a bur can go during access opening without perforating the furcation in first primary mandibular molar is 5.07 mm and 5.54 mm in second primary mandibular molar.

Formação continuada de professores: buscando melhorar e facilitar o ensino para deficientes visuais por meio de tecnologias assistivas

Directory of Open Access Journals (Sweden)

Miriam Ines Marchi

2016-08-01

Full Text Available Este artigo é um recorte da dissertação de Mestrado intitulada: “Deficiente visual: ensinando e aprendendo química através das tecnologias assistivas no ensino médio” e compreende a formação continuada de professores abordando tecnologias assistivas para deficientes visuais. O curso ofertado aos professores de químicas e auxiliares, que trabalham com alunos deficientes visuais, teve como principal objetivo promover o desenvolvimento de novas práticas pedagógicas a partir das tecnologias assistivas. Utilizou-se a técnica de observação em duas escolas Estaduais de Boa Vista/RR para analisar as práticas e anseios dos professores e as necessidades dos alunos na sala de aula regular. A partir desta prática optou-se em promover o curso de Mecdaisy que é uma tecnologia brasileira que traz sintetizador de voz (narração e permite combinar texto, áudio e imagens para representar conteúdos. Constatou-se que a formação continuada possibilitou a reflexão e o crescimento tanto pessoal como profissional e a mudança nas práticas pedagógicas.

Peltier-based cloud chamber

Science.gov (United States)

Nar, Sevda Yeliz; Cakir, Altan

2018-02-01

Particles produced by nuclear decay, cosmic radiation and reactions can be identified through various methods. One of these methods that has been effective in the last century is the cloud chamber. The chamber makes visible cosmic particles that we are exposed to radiation per second. Diffusion cloud chamber is a kind of cloud chamber that is cooled by dry ice. This traditional model has some application difficulties. In this work, Peltier-based cloud chamber cooled by thermoelectric modules is studied. The new model provided uniformly cooled base of the chamber, moreover, it has longer lifetime than the traditional chamber in terms of observation time. This gain has reduced the costs which spent each time for cosmic particle observation. The chamber is an easy-to-use system according to traditional diffusion cloud chamber. The new model is portable, easier to make, and can be used in the nuclear physics experiments. In addition, it would be very useful to observe Muons which are the direct evidence for Lorentz contraction and time expansion predicted by Einsteins special relativity principle.

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.

Políticas Públicas de Ciência e Tecnologia no Rio Grande do Sul como um Instrumento de Desenvolvimento Regional

OpenAIRE

de Lima, Mário Jaime Gomes; de Oliverira Nascimento, Juliana

2015-01-01

As Políticas Públicas de Desenvolvimento Regional, no contexto de Promoção e Valorização das Externalidades da Competitividade Empresarial, proposta por Figueiredo (2009), são organizadas a partir do conceito de impactos externos (externalidades) nos problemas regionais, em especial, no que diz respeito à inovação e tecnologia. Diante disto, o poder estatal, procurando solucionar os impactos dessas externalidades, deve elaborar Políticas Públicas de Ciência e Tecnologia, visando o desenvolvim...

Dual ionization chamber

International Nuclear Information System (INIS)

Mallory, J.; Turlej, Z.

1981-01-01

Dual ionization chambers are provided for use with an electronic smoke detector. The chambers are separated by electrically-conductive partition. A single radiation source extends through the partition into both chambers, ionizing the air in each. The mid-point current of the device may be balanced by adjusting the position of the source

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.

Partitioning of net carbon dioxide flux measured by automatic transparent chamber

Science.gov (United States)

Dyukarev, EA

2018-03-01

Mathematical model was developed for describing carbon dioxide fluxes at open sedge-sphagnum fen during growing season. The model was calibrated using the results of observations from automatic transparent chamber and it allows us to estimate autotrophic, heterotrophic and ecosystem respiration fluxes, gross and net primary vegetation production, and the net carbon balance.

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.

O USO DE TECNOLOGIAS EM MUSEUS E CENTROS DE VISITANTES: ESTUDO DE CASO DO CENTRO DE VISITANTES DO PROJETO TAMAR DE FERNANDO DE NORONHA – PE

Directory of Open Access Journals (Sweden)

Tatiane Ferrari do Vale

2016-04-01

ambiental personalizada, realizada por meio das palestras. Descobrir o limite que tange o uso de tecnologias e a ausência de interpretes é um dos maiores desafios atuais dos museus e centros de visitantes. Palavras-chave: Projeto Tamar. Fernando de Noronha. Novas Tecnologias.

Open Praxis, volumen 0 issue 1

OpenAIRE

Open Praxis, Editor

2006-01-01

Table of Contents - Providing Effective Feedback Online Zane Berge & Mauri Collins (1-10) - Mobile Technologies and the Future of Global Education Rory McGreal (11-16) - Cross-Border Higher Education through E-Learning: Issues and Opportunities Kumiko Aoki (17-25) - Open and Distance Education in the Global Environment: Opportunities for Collaboration Ellie Chambers (26-33) - Global Trade in Educational Services: Implications for Open and Distance Learning (ODL) S. Savithri & K. Murug...

TECNOLOGIA ASSISTIVA NA PERSPECTIVA DE EDUCAÇÃO INCLUSIVA: O CIBERESPAÇO COMO LÓCUS DE AUTONOMIA E AUTORIA

Directory of Open Access Journals (Sweden)

Maria Dolores Fortes Alves

2017-06-01

Full Text Available Este artigo pretende investigar a contribuição da Tecnologia Assistiva (TA na perspectiva da educação inclusiva e o ciberespaço como lócus ímpar do processo de mediação e construção da autonomia autoria de pensamento dos sujeitos implicados no processo de ensino aprendizagem. A percepção do professor em permitir que a pessoa com deficiência se sinta parte do contexto de ensino aprendizagem e construção da autoria de pensamento, supostamente a inclusão acontecerá de forma efetiva facilitando o aprendizado dos alunos em sua diversidade. A metodologia adotada fundamenta-se na pesquisa qualitativa com abordagem participativa e descritiva. Contudo, entende-se que é um processo complexo, mas que tanto o professor quanto o aluno constituirão uma relação pedagógica que cumpra com a função social da escola na vida dos indivíduos singulares. Diante dos aspectos destacados, as tecnologias e as tecnologias assistivas e inclusão escolar.

Tecnologia 3G como Determinante de Custos: estudo em uma operadora de telefonia móvel

Directory of Open Access Journals (Sweden)

Marcos Antônio Souza

2015-08-01

Full Text Available O objetivo do artigo é verificar a influência da tecnologia 3G (tecnologia da terceira geração da telefonia móvel nos determinantes de custos de uma operadora de telefonia móvel localizada no Rio Grande do Sul. O estudo contempla os determinantes de custos sob a ótica e conceitos da vantagem competitiva desenvolvida por Porter (1989 e da gestão estratégica de custos discutida por Shank e Govindarajan (1997. Trata-se de um estudo de caso único, de natureza qualitativa e descritiva, desenvolvido no terceiro trimestre de 2013. A coleta e de dados deu-se por entrevistas semiestruturadas com gestores da empresa, análise documental e observações in loco. A análise dos dados ocorreu pelo confronto do conteúdo das três fontes utilizadas e em relação ao conteúdo apresentado pela literatura acerca do tema. Os principais achados da pesquisa indicam que a terceira geração da tecnologia da telefonia móvel desencadeou um processo de mudanças significativas em determinantes de custos estruturais e operacionais que, por conseguinte, refletiram na estrutura de custos da operadora e na alavancagem de receitas. A caracterização dessas mudanças evidencia consistência delas com a teoria desenvolvida sobre o tema determinantes de custos.

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.

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

Directory of Open Access Journals (Sweden)

Marisa Antonini Ribeiro Bastos

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.

Flatness of two-dimensional beam profile measured with an ionization chamber array

International Nuclear Information System (INIS)

Stefanovski, Z.

2006-01-01

Open beam profiles are basic dosimetric characteristics for the formation of the dose calculation algorithms parameters and for determination of beam quality. One characteristic of the beam profiles as a measure for the beam quality is the field flatness defined as ratio of the difference of maximum and minimum dose in central 80% of the field to the sum of these doses in the part of the field. The measurements, instead with an ordinary ionization chamber, were performed with a chamber array in two depths (1.6 cm and 10 cm) in water phantom. Nominal photon beam energy was 6 MV and field size was 25 cm x 25 cm on the water surface. Field flatness was in the range of 1-2 % which is in accordance with the data acquired during the acceptance testing and commissioning of the accelerators. with the array chamber the beam profiles can be performed quickly and preciously. These features recommend a chamber array as an excellent tool for periodic quality control of beam profiles. (Author)

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.

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.

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.

Identidade e tecnologia social: um estudo junto às artesãs da Vila Rural Esperança

OpenAIRE

Bonilha,Maíra Coelho; Sachuk,Maria Iolanda

2011-01-01

Tanto o mundo quanto as pessoas estão num contínuo processo de transformação, construção e constituição, no qual o sujeito e o ambiente afetam-se mutuamente por meio das múltiplas relações estabelecidas. Sendo assim, o objetivo no presente artigo foi o de compreender de que forma a tecnologia social contribuiu para o processo de construção e constituição da identidade das artesãs da comunidade da Vila Rural Esperança, a partir do momento em que tal tecnologia transformadora (social e humana) ...

Ionization chambers

International Nuclear Information System (INIS)

Boag, J.W.

1987-01-01

Although a variety of solid-state and chemical methods for measuring radiation dose have been developed in recent decades and calorimetry can now provide an absolute standard of reference, ionization dosimetry retains its position as the most widely used, most convenient, and, in most situations, most accurate method of measuring either exposure or absorbed dose. The ionization chamber itself is the central element in this system of dosimetry. In this chapter the principles governing the construction and operation of ionization chambers of various types are examined. Since the ionization chambers now in general use are nearly all of commercial manufacture, the emphasis is on operating characteristics and interpretation of measurements rather than on details of construction, although some knowledge of the latter is often required when applying necessary corrections to the measured quantities. Examples are given of the construction of typical chambers designed for particular purposes, and the methods of calibrating them are discussed

Hong's grading for evaluating anterior chamber angle width.

Science.gov (United States)

Kim, Seok Hwan; Kang, Ja Heon; Park, Ki Ho; Hong, Chul

2012-11-01

To compare Hong's grading method with anterior segment optical coherence tomography (AS-OCT), gonioscopy, and the dark-room prone-position test (DRPT) for evaluating anterior chamber width. The anterior chamber angle was graded using Hong's grading method, and Hong's angle width was calculated from the arctangent of Hong's grades. The correlation between Hong's angle width and AS-OCT parameters was analyzed. The area under the receiver operating characteristic curve (AUC) for Hong's grading method when discriminating between narrow and open angles as determined by gonioscopy was calculated. Correlation analysis was performed between Hong's angle width and intraocular pressure (IOP) changes determined by DRPT. A total of 60 subjects were enrolled. Of these subjects, 53.5 % had a narrow angle. Hong's angle width correlated significantly with the AS-OCT parameters (r = 0.562-0.719, P < 0.01). A Bland-Altman plot showed relatively good agreement between Hong's angle width and the angle width obtained by AS-OCT. The ability of Hong's grading method to discriminate between open and narrow angles was good (AUC = 0.868, 95 % CI 0.756-0.942). A significant linear correlation was found between Hong's angle width and IOP change determined by DRPT (r = -0.761, P < 0.01). Hong's grading method is useful for detecting narrow angles. Hong's grading correlated well with AS-OCT parameters and DRPT.

DVD Implante coclear - conhecendo a tecnologia

Directory of Open Access Journals (Sweden)

Comissão Editorial

2017-01-01

Full Text Available o INES apresenta o DVD Implante Coclear - conhecendo a tecnologia com o objetivo de esclarecer dúvidas e inserir o tema "Implante Coclear" no grande debate que vem se realizando atualmente, quanto à construção de uma educação bilíngue de qualidade para o estudante surdo brasileiro. Com autoria e coordenação geral da professora e Fonoaudióloga Mônica A. de Carvalho Campello, o DVD contou com a participação das equipes do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo (USP e do Hospital Universitário da Universidade Federal do Rio de Janeiro (UFRJ, das equipes de Audiologia e de Fonoaudiologia do INES e também com a participação dos professores surdos e ouvintes do referido Instituto, na apresentação e tradução em Libras.

Gas microstrip chambers

International Nuclear Information System (INIS)

McIntyre, P.M.; Barasch, E.F.; Bowcock, T.J.V.; Demroff, H.P.; Elliott, S.M.; Howe, M.R.; Lee, B.; Mazumdar, T.K.; Pang, Y.; Smith, D.D.; Wahl, J.; Wu, Y.; Yue, W.K.; Gaedke, R.M.; Vanstraelen, G.

1992-01-01

The gas microstrip chamber has been developed from concept to experimental system during the past three years. A pattern of anode and grid lines are microfabricated onto a dielectric substrate and configured as a high-resolution MWPC. Four recent developments are described: Suitable plastic substrates and lithography techniques for large-area chambers; non-planar silicon-based chambers for 20 μm resolution; integrated on-board synchronous front-end electronics and data buffering; and a porous silicon active cathode for enhanced efficiency and time response. The microstrip chamber appears to be a promising technology for applications in microvertex, tracking spectrometer, muon spectrometer, and transition radiation detection. (orig.)

Double chamber ion source

International Nuclear Information System (INIS)

Uman, M.F.; Winnard, J.R.; Winters, H.F.

1978-01-01

The ion source is comprised of two discharge chambers one of which is provided with a filament and an aperture leading into the other chamber which in turn has an extraction orifice. A low voltage arc discharge is operated in an inert gas atmosphere in the filament chamber while an arc of higher voltage is operated in the second ionization chamber which contains a vapor which will give the desired dopant ion species. The entire source is immersed in an axial magnetic field parallel to a line connecting the filament, the aperture between the two chambers and the extraction orifice. (author)

Ussing Chamber

NARCIS (Netherlands)

Westerhout, J.; Wortelboer, H.; Verhoeckx, K.

2015-01-01

The Ussing chamber system is named after the Danish zoologist Hans Ussing, who invented the device in the 1950s to measure the short-circuit current as an indicator of net ion transport taking place across frog skin (Ussing and Zerahn, Acta Physiol Scand 23:110-127, 1951). Ussing chambers are

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.

Produção de PCB recorrendo a tecnologia Laser

OpenAIRE

Soares, Rodolfo da Silva

2011-01-01

O elevado nível de integração e miniaturização dos componentes existente nos dias de hoje, criam novos desafios na concepção de circuitos impressos. Neste trabalho são apresentados métodos para interligação entre componentes, em circuitos impressos com elevado número de ligações, recorrendo a tecnologia laser. Foi desenvolvida uma máquina CNC de três eixos, para posicionamento de um laser, mantendo o suporte para as operações tradicionais com ferramentas. O sistema foi concebid...

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.

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.

EDUCAÇÃO DE JOVENS E ADULTOS E NOVAS TECNOLOGIAS DA INFORMAÇÃO: UMA ABORDAGEM EDUCACIONAL

Directory of Open Access Journals (Sweden)

Cristiana Barcelos da Silva

2016-04-01

Full Text Available A instituição escolar tem sido apontada como o lócus de estudos e análises de fenômenos educacionais. As implicações aqui discutidas fizeram parte de uma pesquisa cujo objetivo foi compreender como os professores da Educação de Jovens e Adultos (EJA se posicionavam frente ao desafio da utilização das novas tecnologias da informação e da comunicação na prática educacional, após a proposta de programa denominada “Nova EJA”, implementada pela Secretaria de Estado de Educação do Estado do Rio de Janeiro (SEEDUC. Os sete questionários foram analisados com base nos estudos do novo papel do professor de Lévy (1993, 2005 e das competências e habilidades necessárias à prática docente de Tardif (1991, 2000, 2014. Os resultados assinalaram que para além da infraestrutura necessária ao uso das tecnologias na escola, os docentes apontaram para a necessidade de construção de conhecimentos nos cursos de formação profissional inicial, sendo entendido como uma das formas de viabilizar uma atuação pedagógica que relacione positivamente educação e novas tecnologias.

Performance Analysis of a Solar Dryer Equipped with a Recycling Air System and Desiccant Chamber

Directory of Open Access Journals (Sweden)

M.H Aghkhani

2013-09-01

Full Text Available Drying is a high energy consuming process. Solar drying is one of the most popular methods for dehydration of agricultural products. In the present study, the performance of a forced convection solar dryer equipped with recycling air system and desiccant chamber was investigated. The solar dryer is comprised of solar collector, drying chamber, silica jell desiccant chamber, air ducts, fan and measuring and controlling system. Drying rate and energy consumption in three levels of air temperature (40, 45 and 50 oC and two modes of drying (with recycling air and no-recycling with open duct system were measured and compared. The results showed that increasing the drying air temperature decreased the drying time and increased the energy consumption in the mode of non-recycling air system. The dryer efficiency and drying rate were better in the mode of recycling air system than open duct system. The highest dryer efficiency was obtained from drying air temperature of 50 oC and the mode of recycling air system. In general, the efficiency of solar collector and the highest efficiency of the dryer were 0.34 and 0.41, respectively.

BALANÇO DE MASSA APLICADO A TECNOLOGIA DE PRODUÇÃO DO LEITE CONDENSADO: CONSIDERAÇÕES TEÓRICAS

Directory of Open Access Journals (Sweden)

Rodrigo Stephani

2012-08-01

Full Text Available O objetivo deste trabalho foi aplicar o balanço de massa à tecnologia de produção do leite condensado. Os cálculos teóricos foram realizados para as etapas de padronização do teor de gordura, para a relação entre o teor de gordura e de sólidos não gordurosos (RF e para a determinação do rendimento de fabricação. As equações e exemplos apresentados são úteis para a padronização das tecnologias nas indústrias de leite condensado.

O recrutamento e selecção de pessoas na área das tecnologias de informação

OpenAIRE

Silva, Ricardo José Jordão

2016-01-01

Este projeto tem como foco as práticas de recrutamento e seleção na área das tecnologias de informação. O objetivo principal é identificar as práticas mais utilizadas em empresas na área das TI em Portugal e verificar a sua eficácia, no que se refere à retenção e ao desempenho dos contratados. Foi adaptado e aplicado um questionário a 31 empresas de TI incubadas no Instituto Pedro Nunes (IPN) e no Taguspark – Parque de Ciência & Tecnologia. Os dados recolhidos referem-se às atividades de recr...

Performance of a Compression-ignition Engine with a Precombustion Chamber Having High-Velocity Air Flow

Science.gov (United States)

Spanogle, J A; Moore, C S

1931-01-01

Presented here are the results of performance tests made with a single-cylinder, four stroke cycle, compression-ignition engine. These tests were made on a precombustion chamber type of cylinder head designed to have air velocity and tangential air flow in both the chamber and cylinder. The performance was investigated for variable load and engine speed, type of fuel spray, valve opening pressure, injection period and, for the spherical chamber, position of the injection spray relative to the air flow. The pressure variations between the pear-shaped precombustion chamber and the cylinder for motoring and full load conditions were determined with a Farnboro electric indicator. The combustion chamber designs tested gave good mixing of a single compact fuel spray with the air, but did not control the ensuing combustion sufficiently. Relative to each other, the velocity of air flow was too high, the spray dispersion by injection too great, and the metering effect of the cylinder head passage insufficient. The correct relation of these factors is of the utmost importance for engine performance.

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.

CIÊNCIA, TECNOLOGIA E INOVAÇÃO EM NOTÍCIA NO VALE DO PARAÍBA

Directory of Open Access Journals (Sweden)

Paula Carolina Rabelo Vinhas

2016-08-01

Full Text Available Embora a região do Vale do Paraíba seja considerada um importante polo de pesquisa, tecnologia e inovação em nível nacional, é discreto o papel da imprensa local na difusão desses temas junto à comunidade. O presente trabalho consiste na avaliação da cobertura diária em Ciência, Tecnologia e Inovação (CT&I, ao longo de um mês (dezembro de 2014, em dois periódicos (mídia impressa e internet do Vale do Paraíba, “O Vale” e “Meon”, com o objetivo principal de avaliar quais os temas priorizados pela imprensa local (de abrangência regional na área de CT&I. Para isso, e com o intuito de auxiliar a análise crítica da cobertura midiática desses temas, dividimos o material recolhido em três categorias: I temas gerais; II assunto; III escala espacial.

Tecnologias desenvolvidas pelas instituições de ensino superior para idosos com deficiência

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Hundra Prestes de Godoi

2017-12-01

Full Text Available Introdução: Com o aumento do envelhecimento populacional e das Doenças Crônicas Não Transmissíveis é cada vez mais prevalente pessoas idosas com deficiência. Consoante, as instituições formadoras na área da saúde devem preparar os futuros profissionais para estas demandas desenvolvendo oportunidades de aprendizado e novas tecnologias de cuidado. Objetivo: investigar as tecnologias de cuidado ao idoso com deficiência nas Instituições de Ensino Superior (IES que oferecem cursos na área da saúde na região da Grande Florianópolis/SC. Método: pesquisa mista exploratório-descritiva realizada com 26 coordenadores de cursos de saúde das IES da Grande Florianópolis/ de novembro/2016 a abril/2017. Os dados foram coletados mediante questionário estruturado e submetidos à análise temática de conteúdo de Minayo. Os resultados foram discutidos à luz da literatura pertinente. Resultados: dos atendimentos realizados 86% dos cursos o desenvolvem somente para idosos e 59% para idoso com deficiência. Quanto aos projetos de pesquisa e extensão 72,7% dos cursos realizam projetos para pessoas idosas e 50% especificamente para idosos com deficiência. No quesito atividades de lazer 23% dos coordenadores responderam que as realizam para o público idoso e 18% ao idoso com deficiência. Conclusões: a maioria dos cursos de graduação na área da saúde desenvolve tecnologias de cuidado relacionadas ao envelhecimento e deficiências, mas relacioná-los ao currículo, pesquisa e extensão ainda são incipientes, considerando a problemática populacional emergente no Brasil.

Automated correction on X-rays calibration using transmission chamber and LabVIEWTM

International Nuclear Information System (INIS)

Betti, Flavio; Potiens, Maria da Penha Albuquerque

2009-01-01

Uncertainties during prolonged exposure times on X-rays calibration procedures at the Instruments Calibration facilities at IPEN may suffer from efficiency (and therefore intensity) variations on the industrial X-Ray generator used. Using a transmission chamber as an online reference chamber during the whole irradiation process is proposed in order to compensate for such error source. Also temperature (and pressure) fluctuations may arise from the performance limited calibration room air conditioning system. As an open ionization chamber, that monitor chamber does require calculation of a correction factor due to the temperature and pressure effects on air density. Sending and processing data from all related instruments (electrometer, thermometer and barometer) can be more easily achieved by interfacing them to a host computer running an especially developed algorithm using LabVIEW TM environment which will not only apply the proper correction factors during runtime, but also determine the exact length of time to reach a desired condition, which can be: time period, charge collected, or air kerma, based on the previous calibration of the whole system using a reference chamber traceable to primary standard dosimetry laboratories. When performing such calibration, two temperature sensors (secondary standard thermistors) are simultaneously used, one for the transmission chamber, and other for the reference chamber. As the substitution method is used during actual customer's calibration, the readings from the second thermistor can also be used when desired for further corrections. Use of LabVIEW TM programming language allowed for a shorter development time, and it is also extremely convenient to make things easier when improvements and modifications are called for. (author)

Reverse pupillary block after implantation of a scleral-sutured posterior chamber intraocular lens: a retrospective, open study.

Science.gov (United States)

Bang, Seung Pil; Joo, Choun-Ki; Jun, Jong Hwa

2017-03-29

To report the clinical features of patients with reverse pupillary block (RPB) after scleral-sutured posterior chamber intraocular lens (PC IOL) implantation and biometric changes after laser peripheral iridotomy (LPI). Eight patients attending our hospital's ophthalmology outpatient clinic, who developed RPB after implantation of a scleral-sutured PC IOL due to subluxation of the crystalline lens or IOL, were investigated in this retrospective, observational study. Preoperative evaluations showed angle pigmentation in all cases and iridodonesis in 2 cases. Two subjects had used an α 1A -adrenoceptor antagonist for benign prostatic hyperplasia. Pars plana or anterior partial vitrectomy was performed in all cases. All eyes showed an extremely deep anterior chamber, a concave iris configuration, and contact between the IOL optic and the iris at the pupillary margin. Pupil capture was detected in 2 cases. The mean (± SD) anterior chamber angle (ACA) was 89.91 ± 10.06°, and the anterior chamber depth (ACD) was 4.42 ± 0.16 mm before LPI. After LPI, the iris immediately became flat with a decreased ACA (51.70 ± 2.59°; P = 0.018) and ACD (4.14 ± 0.15 mm; P = 0.012). After LPI, the intraocular pressure decreased from 19.75 ± 3.77 mmHg to 15.63 ± 4.30 mmHg (P = 0.011), and the spherical equivalent decreased from -0.643 ± 0.385 D to - 0.875 ± 0.505 D (P = 0.016). Concomitant vitrectomy, angle pigmentation, and iridodonesis may be risk factors for RPB after scleral-sutured PC IOL implantation. LPI is effective for relieving the RPB.

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

Threshold bubble chamber for measurement of knock-on DT neutron tails from magnetic and inertial confinement experiments

International Nuclear Information System (INIS)

Fisher, R.K.; Zaveryaev, V.S.; Trusillo, S.V.

1996-07-01

We propose a new open-quotes thresholdclose quotes bubble chamber detector for measurement of knock-on neutron tails. These energetic neutrons result from fusion reactions involving energetic fuel ions created by alpha knock-on collisions in tokamak and other magnetic confinement experiments, and by both alpha and neutron knock-on collisions in inertial confinement fusion (ICF) experiments. The energy spectrum of these neutrons will yield information on the alpha population and energy distribution in tokamaks, and on alpha target physics and ρR measurements in ICF experiments. The bubble chamber should only detect neutrons with energies above a selectable threshold energy controlled by the bubble chamber pressure. The bubble chamber threshold mechanism, detection efficiency, and proposed applications to the International Thermonuclear Experimental Reactor (ITER) and National Ignition Facility (NIF) experiments will be discussed

Dorsal skinfold chamber models in mice

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Schreiter, Jeannine

2017-07-01

Full Text Available Background/purpose: The use of dorsal skinfold chamber models has substantially improved the understanding of micro-vascularisation in pathophysiology over the last eight decades. It allows pathophysiological studies of vascularisation over a continuous period of time. The dorsal skinfold chamber is an attractive technique for monitoring the vascularisation of autologous or allogenic transplants, wound healing, tumorigenesis and compatibility of biomaterial implants. To further reduce the animals’ discomfort while carrying the dorsal skinfold chamber, we developed a smaller chamber (the Leipzig Dorsal Skinfold Chamber and summarized the commercial available chamber models. In addition we compared our model to the common chamber. Methods: The Leipzig Dorsal Skinfold Chamber was applied to female mice with a mean weight of 22 g. Angiogenesis within the dorsal skinfold chamber was evaluated after injection of fluorescein isothiocyanate dextran with an Axio Scope microscope. The mean vessel density within the dorsal skinfold chamber was assessed over a period of 21 days at five different time points. The gained data were compared to previous results using a bigger and heavier dorsal skinfold model in mice. A PubMed and a patent search were performed and all papers related to “dorsal skinfold chamber” from 1 of January 2006 to 31 of December 2015 were evaluated regarding the dorsal skinfold chamber models and their technical improvements. The main models are described and compared to our titanium Leipzig Dorsal Skinfold Chamber model.Results: The Leipzig Dorsal Skinfold Chamber fulfils all requirements of continuous models known from previous chamber models while reducing irritation to the mice. Five different chamber models have been identified showing substantial regional diversity. The newly elaborated titanium dorsal skinfold chamber may replace the pre-existing titanium chamber model used in Germany so far, as it is smaller and lighter

A combination drift chamber/pad chamber for very high readout rates

International Nuclear Information System (INIS)

Spiegel, L.; Cataldi, G.; Elia, V.; Mazur, P.; Murphy, C.T.; Smith, R.P.; Yang, W.; Alexopoulos, T.; Durandet, C.; Erwin, A.; Jennings, J.; Antoniazzi, L.; Introzzi, G.; Lanza, A.; Liguori, G.; Torre, P.; Arenton, M.; Conetti, S.; Cox, B.; Dukes, E.; Golovatyuk, V.; Hanlet, P.; McManus, A.; Nelson, K.; Recagni, M.; Segal, J.; Sun, J.; Ballagh, C.; Bingham, H.; Kaeding, T.; Lys, J.; Misawa, S.; Blankman, A.; Borodin, S.; Kononenko, W.; Newcomer, M.; Selove, W.; Trojak, T.; VanBerg, R.; Zhang, S.N.; Block, M.; Corti, G.; LeCompte, T.; Rosen, J.; Yao, T.; Boden, A.; Cline, D.; Ramachandran, S.; Rhoades, J.; Tokar, S.; Budagov, J.; Tsyganov, E.; Cao, Z.L.; He, M.; Wang, C.; Wei, C.; Zhang, N.; Chen, T.Y.; Yao, N.; Clark, K.; Jenkins, M.; Cooper, M.; Creti, P.; Gorini, E.; Grancagnolo, F.; Panareo, M.; Fortney, L.; Kowald, W.; Haire, M.; Judd, D.; Turnbull, L.; Wagoner, D.; Lau, K.; Mo, G.; Trischuk, J.

1991-11-01

Six medium-sized (∼1 x 2 m 2 ) drift chambers with pad and stripe readout have been constructed for and are presently operating in Fermi National Accelerator Laboratory experiment E-771. Each chamber module actually represents a pair of identical planes: two sets of anode wires, two sets of stripes, and two sets of pads. The wire planes are read out separately and represent X measurements in the coordinate system of the experiment. The twin stripe and pad planes are internally paired within the chamber modules; stripe signals represent Y measurements and pad signals combination X and Y measurements. Signals which develop on the stripes and pads are mirror (but inverted) images of what is seen on the wires. In addition to being used in the off-line pattern recognition, pad signals are also used as inputs to an on-line high transverse momentum (pt) trigger processor. While the techniques involved in the design and construction of the chambers are not novel, they may be of interest to experiments contemplating very large area, high rate chambers for future spectrometers

A combination drift chamber/pad chamber for very high readout rates

Energy Technology Data Exchange (ETDEWEB)

Spiegel, L.; Cataldi, G.; Elia, V.; Mazur, P.; Murphy, C.T.; Smith, R.P.; Yang, W. (Fermi National Accelerator Lab., Batavia, IL (United States)); Alexopoulos, T.; Durandet, C.; Erwin, A.; Jennings, J. (Wisconsin Univ., Madison, WI (United States)); Antoniazzi, L.; Introzzi, G.; Lanza, A.; Liguori, G.; Torre, P. (Pavia Univ. (Italy) Istituto Nazionale di Fisica Nucleare, Rome (Italy)); Arenton, M.; Conetti, S.

1991-11-01

Six medium-sized ({approx}1 {times} 2 m{sup 2}) drift chambers with pad and stripe readout have been constructed for and are presently operating in Fermi National Accelerator Laboratory experiment E-771. Each chamber module actually represents a pair of identical planes: two sets of anode wires, two sets of stripes, and two sets of pads. The wire planes are read out separately and represent X measurements in the coordinate system of the experiment. The twin stripe and pad planes are internally paired within the chamber modules; stripe signals represent Y measurements and pad signals combination X and Y measurements. Signals which develop on the stripes and pads are mirror (but inverted) images of what is seen on the wires. In addition to being used in the off-line pattern recognition, pad signals are also used as inputs to an on-line high transverse momentum (pt) trigger processor. While the techniques involved in the design and construction of the chambers are not novel, they may be of interest to experiments contemplating very large area, high rate chambers for future spectrometers.

Investigação no contexto brasileiro sobre gestão do conhecimento/aprendizagem/tecnologia de informação: pesquisa realizada na Scientific Electronic Library Online

Directory of Open Access Journals (Sweden)

Wagner Igarashi

Full Text Available Este artigo investiga a produção científica sobre gestão do conhecimento/aprendizagem/tecnologia de informação por meio de pesquisa na Scientific Electronic Library Online. Primeiro de tudo, foram encontrados 194 artigos que abordavam esses termos separadamente. Num segundo momento, dos 194 artigos foram selecionados 49 que tratavam da gestão do conhecimento organizacional, enfocando o processo e o nível de aprendizagem e utilizando ferramentas de tecnologia de informação. Nestes 49 artigos foi aplicada a classificação de aprendizagem proposta por Pawlowsky, Forslin e Reinhardt (2003, o que possibilitou selecionar oito artigos que apresentavam um maior número de ocorrências relativas à classificação. Por fim, esses oito artigos foram mapeados, constatando-se que a gestão do conhecimento organizacional se refere a um processo de mudança cultural, e que a aprendizagem é um elemento essencial a ser apoiado por ferramentas de tecnologia de informação. Essa constatação possibilitou ainda o entendimento de que (i a tecnologia de informação pode auxiliar na gestão do conhecimento como um todo (alavancando, conduzindo e direcionando, e (ii de que é necessário adaptar a tecnologia de informação ao contexto organizacional.

Review of wire chamber aging

International Nuclear Information System (INIS)

Va'Vra, J.

1986-02-01

This paper makes an overview of the wire chamber aging problems as a function of various chamber design parameters. It emphasizes the chemistry point of view and many examples are drawn from the plasma chemistry field as a guidance for a possible effort in the wire chamber field. The paper emphasizes the necessity of variable tuning, the importance of purity of the wire chamber environment, as well as it provides a practical list of presently known recommendations. In addition, several models of the wire chamber aging are qualitatively discussed. The paper is based on a summary talk given at the Wire Chamber Aging Workshop held at LBL, Berkeley on January 16-17, 1986. Presented also at Wire Chamber Conference, Vienna, February 25-28, 1986. 74 refs., 18 figs., 11 tabs

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.

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.

Tecnologia da informação e comunicação para recarga inteligente

NARCIS (Netherlands)

Montes Portela, C.; Geldtmeijer, D.A.M.; Slootweg, J.G.; van Eekelen, Marko

2014-01-01

Este artigo apresenta uma arquitetura de tecnologia da informação e comunicação flexível, com privacidade de dados, para o carregamento inteligente de veículos elétricos, implementada para demonstração pelo operador do sistema de distribuição holandês. Seu objetivo é incorporar infraestruturas

Filosofia da tecnologia e educação: conservação ou crítica inovadora da modernidade?

Directory of Open Access Journals (Sweden)

Geraldo Antônio da Rosa

Full Text Available Resumo: O campo dos estudos sobre ciência e tecnologia e seus benefícios na vida das populações está sendo questionado de maneira veemente nos últimos tempos. A justificativa de que o desenvolvimento da ciência e da tecnologia avança de maneira inexorável e neutra caiu por terra, frente às inúmeras confrontações e limites a que ficou exposta essa racionalidade. São muitos testemunhos e mesmo movimentos teóricos que questionam essa crença atualmente. Nesse texto, pretende-se delimitar alguns marcos teórico-conceituais nos quais se desenvolvem tais propostas do ponto de vista de sua relação com a educação. Para isso, parte-se da discussão, proposta por Marilena Chauí, sobre o modo como se constitui a racionalidade moderna e sua forma de apropriação pelas populações através da ideologia do cientificismo. A seguir, a crítica a essa racionalidade é avaliada segundo os preceitos da Escola de Frankfurt, especialmente na visão de Marcuse e Feenberg. Por último, procura-se apresentar alguns fundamentos dos estudos do movimento Ciência, Tecnologia e Sociedade (CT&S sobre essas questões, derivando reflexões para o campo da educação. Trata-se de avançar a discussão de suas origens, conforme exposto na filosofia da tecnologia, de Heidegger, a qual acredita ser destino da humanidade viver sob a égide da técnica, em busca de uma outra relação com a realidade, mais em harmonia com a natureza.

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.

Change of Pressing Chamber Conicalness at Briquetting Process in Briquetting Machine Pressing Chamber

Directory of Open Access Journals (Sweden)

Peter Križan

2012-01-01

Full Text Available In this paper, we will present the impact of the conical shape of a pressing chamber, an important structural parameter. Besides the known impact of the technological parameters of pressing chambers, it is also very important to pay attention to their structural parameters. In the introduction, we present a theoretical analysis of pressing chamber conicalness. An experiment aimed at detecting this impact was performed at our institute, and it showed that increasing the conicalness of a pressing chamber improves the quality of the final briquettes. The conicalness of the pressing chamber has a significanteffect on the final briquette quality and on the construction of briquetting machines. The experimental findings presented here show the importance of this parameter in the briquetting process.

Design, construction and testing of a radon experimental chamber

International Nuclear Information System (INIS)

Chavez B, A.; Balcazar G, M.

1991-10-01

To carry out studies on the radon behavior under controlled and stable conditions it was designed and constructed a system that consists of two parts: a container of mineral rich in Uranium and an experimentation chamber with radon united one to the other one by a step valve. The container of uranium mineral approximately contains 800 gr of uranium with a law of 0.28%; the radon gas emanated by the mineral is contained tightly by the container. When the valve opens up the radon gas it spreads to the radon experimental chamber; this contains 3 accesses that allow to install different types of detectors. The versatility of the system is exemplified with two experiments: 1. With the radon experimental chamber and an associated spectroscopic system, the radon and two of its decay products are identified. 2. The design of the system allows to couple the mineral container to other experimental geometries to demonstrate this fact it was coupled and proved a new automatic exchanger system of passive detectors of radon. The results of the new automatic exchanger system when it leave to flow the radon freely among the container and the automatic exchanger through a plastic membrane of 15 m. are shown. (Author)

Tecnologias assistivas e a inclusão do estudante surdo na educação superior

Directory of Open Access Journals (Sweden)

Pricila Kohls dos Santos

2017-08-01

Full Text Available A comunicação é fundamental para que as relações de ensino e aprendizagem se estabeleçam em todos os níveis de educação. Nesse sentido, o presente estudo analisa a presença do estudante surdo na Educação Superior e como se dá sua comunicação em relação com professores e colegas na Universidade. Para melhor compreender esse processo, foram trazidas teorias relacionadas ao tema e dados do Censo concernentes à inclusão do aluno surdo na Educação Superior. Trouxeram-se também algumas tecnologias assistivas disponíveis para a pessoa com deficiência auditiva e que podem ser utilizadas para mediação técnico-pedagógica. Outrossim, analisa-se a perspectiva do estudante surdo na Educação Superior, suas dificuldades e desafios, e como a tecnologia está presente em seu cotidiano, auxiliando-o no processo de sua aprendizagem. A pesquisa é de cunho qualitativo, exploratório, sendo a análise dos dados baseada na análise textual discursiva. Os resultados apontam para a necessidade de a gestão da instituição pensar em espaços de apoio ao estudante de inclusão, de investir em tecnologias assistivas, de promover espaços de discussão entre gestão, docentes e estudantes visando à qualificação da inclusão do estudante com deficiência na universidade.

Impactos da IoT na gestão de projetos de tecnologias e sistemas de informação

OpenAIRE

Ribeiro, Laura Catarina Gonçalves; Oliveira e Sá, Jorge; Varajão, João

2017-01-01

A Internet of Things (IoT) representa um novo paradigma de integração de várias tecnologias e soluções de comunicação, encontrando aplicações em muitos domínios diferentes, tais como a agricultura, a saúde, os edifícios e cidades inteligentes, a segurança e a vigilância, e em muitas outras áreas. Uma área a estudar no âmbito da IoT é a de gestão de projetos de tecnologias e sistemas de informação. A gestão de projetos aplica conhecimentos, competências e técnicas na realização ...

Heideggerianismo de esquerda ou marxismo fenomenológico?Reconsiderando a teoria crítica da tecnologia de Herbert Marcuse

Directory of Open Access Journals (Sweden)

John Abromeit

Full Text Available Diferentemente de interpretações recentes sobre a teoria marcuseana da tecnologia, elogiosas ou críticas, que identificam nela uma forte e contínua influência de Heidegger, pretendo mostrar, no presente artigo, que Marcuse toma de empréstimo elementos importantes da fenomenologia de Heidegger e, mais ainda, de Husserl, mas que essses elementos são apropriados dentro de uma abordagem teórica geral marxista. Dessa maneira, enfatizam-se os fatores sociais e históricos como os determinantes últimos da tecnologia e da racionalidade tecnológica. Com isso, o presente artigo procura esclarecer a relação entre o marxismo e a fenomenologia na obra tardia de Marcuse.

Sleeve reaction chamber system

Science.gov (United States)

Northrup, M Allen [Berkeley, CA; Beeman, Barton V [San Mateo, CA; Benett, William J [Livermore, CA; Hadley, Dean R [Manteca, CA; Landre, Phoebe [Livermore, CA; Lehew, Stacy L [Livermore, CA; Krulevitch, Peter A [Pleasanton, CA

2009-08-25

A chemical reaction chamber system that combines devices such as doped polysilicon for heating, bulk silicon for convective cooling, and thermoelectric (TE) coolers to augment the heating and cooling rates of the reaction chamber or chambers. In addition the system includes non-silicon-based reaction chambers such as any high thermal conductivity material used in combination with a thermoelectric cooling mechanism (i.e., Peltier device). The heat contained in the thermally conductive part of the system can be used/reused to heat the device, thereby conserving energy and expediting the heating/cooling rates. The system combines a micromachined silicon reaction chamber, for example, with an additional module/device for augmented heating/cooling using the Peltier effect. This additional module is particularly useful in extreme environments (very hot or extremely cold) where augmented heating/cooling would be useful to speed up the thermal cycling rates. The chemical reaction chamber system has various applications for synthesis or processing of organic, inorganic, or biochemical reactions, including the polymerase chain reaction (PCR) and/or other DNA reactions, such as the ligase chain reaction.

Dual-chamber inflatable oil boom

International Nuclear Information System (INIS)

Blair, R.M.; Tedeschi, E.T.

1993-01-01

An elongated floating material containment boom section is described having a normally vertical ballasted skirt depending from flotation means, and convertible from a flattened collapsed condition to a deployable condition wherein buoyancy chamber means extending along the upper edge of said skirt are inflated to expanded buoyant configuration, including: a gas-impervious sleeve extending along the upper edge of said normally vertical skirt forming a first outer collapsible and inflatable flotation chamber, a first inflation valve connecting the interior of said sleeve with the ambient atmosphere, through which gas under pressure may be introduced into said sleeve to inflate said first buoyant outer flotation chamber, elongated gas-impervious tube means positioned inside said outer flotation chamber and forming second collapsible and inflatable internal flotation bladder chamber means, second inflation valve means connecting the interior of said bladder means through said outer flotation chamber to the ambient atmosphere through which gas under pressure may be introduced into said bladder means to inflate it forming said second flotation chamber means inside said outer flotation chamber

BEBC bubble chamber

CERN Multimedia

CERN PhotoLab

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.

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...

Tecnologia e Metodologia no Ensino de Inglês: Impactos da Globalização e da Internacionalização

OpenAIRE

Kyria Rebeca Finardi; Maria Carolina Porcino

2014-01-01

http://dx.doi.org/10.5007/2175-8026.2014n66p239 O artigo reflete sobre o papel das tecnologias nas diversas metodologias de ensino de inglês e sobre o impacto da globalização e internacionalização na educação em geral e no ensino de inglês em especial. O estudo é baseado no pressuposto de que o acesso à informação e à tecnologia é necessário para a construção de capital social (WARSCHAUER, 2003) e que esse acesso exige algum conhecimento de inglês e letramento digital (FINARDI; PREBIANCA;...

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.

O uso de tecnologias digitais em uma instituição de ensino superior: apontamentos sobre a saúde do jovem

OpenAIRE

Rosa, Ana Luisa Martins; Arruda, Eduardo Chierrito de; Martins, Ana Beatriz Tozzo; Milani, Rute Grossi

2017-01-01

O estudo buscou caracterizar o comportamento de uso das tecnologias digitais por jovens universitários e tecer apontamentos sobre as possíveis inferências em sua saúde. Participaram 361 jovens, com idade entre 17 e 24 anos, matriculados em uma instituição de ensino no norte do Paraná. Aplicou-se um questionário contendo questões sobre: idade do primeiro acesso, frequência e finalidade do uso. A análise estatística, por meio de regressão logística, mostrou que as tecnologias de informática são...

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.

Threshold bubble chamber for measurement of knock-on DT neutron tails from magnetic and inertial confinement experiments

International Nuclear Information System (INIS)

Fisher, R.K.; Zaveryaev, V.S.; Trusillo, S.V.

1997-01-01

We propose a new open-quotes thresholdclose quotes bubble chamber detector for measurement of knock-on neutron tails. These energetic neutrons result from fusion reactions involving energetic fuel ions created by alpha knock-on collisions in tokamak and other magnetic confinement experiments, and by both alpha and neutron knock-on collisions in inertial confinement fusion (ICF) experiments. The energy spectrum of these neutrons will yield information on the alpha population and energy distribution in tokamaks, and on alpha target physics and ρR measurements in ICF experiments. The bubble chamber should only detect neutrons with energies above a selectable threshold energy controlled by the bubble chamber pressure. The bubble chamber threshold mechanism, detection efficiency, and proposed applications to the International Thermonuclear Experimental Reactor and National Ignition Facility experiments will be discussed. copyright 1997 American Institute of Physics

Reference ionization chamber

International Nuclear Information System (INIS)

Golnik, N.; Zielczynski, M.

1999-01-01

The paper presents the design of ionization chamber devoted for the determination of the absolute value of the absorbed dose in tissue-equivalent material. The special attention was paid to ensure that the volume of the active gas cavity was constant and well known. A specific property of the chamber design is that the voltage insulators are 'invisible' from any point of the active volume. Such configuration ensures a very good time stability of the electrical field and defines the active volume. The active volume of the chamber was determined with accuracy of 0.3%. This resulted in accuracy of 0.8% in determination of the absorbed dose in the layer of material adherent to the gas cavity. The chamber was applied for calibration purposes at radiotherapy facility in Joint Institute for Nuclear Research in Dubna (Russia) and in the calibration laboratory of the Institute of Atomic Energy in Swierk. (author)

Avaliação da acessibilidade de tecnologia assistiva para surdos

OpenAIRE

Áfio, Aline Cruz Esmeraldo; Carvalho, Aline Tomaz de; Carvalho, Luciana Vieira de; Silva, Andréa Soares Rocha da; Pagliuca, Lorita Marlena Freitag

2016-01-01

RESUMO Objetivo: avaliar acessibilidade automática de tecnologia assistiva, na modalidade de curso on-line, para surdos. Método: estudo avaliativo, orientado pela etapa de Avaliação e Manutenção proposta no Modelo de Desenvolvimento de Material Educativo Digital. Utilizou-se software Avaliador e Simulador de Acessibilidade de Sítios para análise do curso on-line "Educação em Saúde Sexual e Reprodutiva: uso dos preservativos", conforme normas de acessibilidade de sítios eletrônicos nacionais...

Avaliação e incorporação de tecnologias em saúde: processo e metodologia adotados por um hospital universitário de alta complexidade assistencial

Directory of Open Access Journals (Sweden)

Altacílio Aparecido Nunes

2013-01-01

Full Text Available As transições demográfica e epidemiológica tendem a fazer os hospitais cada vez mais necessários à assistência médica. Neles, as tecnologias eficazes, custo-efetivas e seguras, garantem melhor qualidade assistencial e maior sobrevida aos usuários. Assim, a avaliação dessas tecnologias baseada em hospital é prática aconselhável, o que se verifica em todo o mundo. O objetivo deste artigo é apresentar um modelo de avaliação e incorporação de tecnologia em um hospital universitário de alta complexidade. Trata-se de uma descrição de métodos/processos avaliativos que podem ser facilmente adotados por qualquer unidade hospitalar independentemente de sua natureza. Observou-se que o modelo adotado tem possibilitado a adequada avaliação de tecnologias em saúde (ATS, legitimando as decisões de incorporação pelo gestor, com boa aceitação e aderência do corpo clínico. Assim, a ATS em hospital, por empregar processos bem estruturados, consensuais e com apoio da gestão institucional, pode ser uma ferramenta poderosa para disseminação e valorização da cultura de se avaliarem tecnologias em saúde.

Tecnologia da Informação e Marketing: como obter clientes e mercados

OpenAIRE

Gonçalves,Carlos Alberto; Gonçalves Filho,Cid

1995-01-01

A Tecnologia da Informação passa a ser vista como uma arma para obtenção de clientes e negócios competitivos. Permite que o Marketing trate novamente necessidades e desejos de forma personalizada. The Information Technologies can be seen as an important resource to get clients and competitive business. It makes possible Marketing actions to treat needs and desires in a personalized way again.

Status of COLDDIAG: A Cold Vacuum Chamber for Diagnostics

CERN Document Server

Gerstl, Stefan; Casalbuoni, Sara; Grau, Andreas; Hagelstein, Michael; Saez de Jauregui, David; Baglin, Vincent; Boffo, Cristian; Sikler, Gunther; Bradshaw, Thomas; Cimino, Roberto; Commisso, Mario; Spataro, Bruno; Clarke, James; Scott, Duncan; Cox, Matthew; Schouten, Jos; Jones, Roger; Shinton, Ian; Mostacci, Andrea; Wallen, Erik; Weigel, Ralf

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.

Plastic flashtube chambers

International Nuclear Information System (INIS)

Frisken, W.R.

1977-01-01

A brief discussion is given of the use and operation of plastic flashtube chambers. Gas leaks, electric pulsing, the glow discharge, and readout methods are considered. Three distinct problems with high rate applications deal with resolving time, dead time, and polarization/neutralization of the chamber

Tecnologia de identificação por radiofreqüência: fundamentos e aplicações em automação de bibliotecasRadio frequency identification technology: fundaments and applications in libraries automation

Directory of Open Access Journals (Sweden)

Angel Freddy Godoy Viera

2007-01-01

Full Text Available A tecnologia de identificação por radiofreqüência (RFID é a mais nova tecnologia que, de forma acelerada, está sendo introduzida nas principais bibliotecas do mundo para a gestão eletrônica do acervo e implementação de serviços de auto-atendimento, entre outros serviços. Este artigo tem por objetivo apresentar os princípios de funcionamento da tecnologia RFID, seus componentes, as barreiras na adoção desta tecnologia e exemplos de iniciativas de implementação em bibliotecas. A metodologia utilizada foi a pesquisa bibliográfica e documental sobre a tecnologia RFID com aplicação em bibliotecas. Os resultados do trabalho mostram que esta tecnologia está se expandindo cada vez mais em nível mundial, no âmbito das bibliotecas. Conclui-se que a tecnologia RFID é uma das tecnologias de automação de bibliotecas que deve ser considerada na gestão eletrônica do acervo, tendo em vista às grandes vantagens que oferece.The Radio Frequency Identification Technology (RFID is the newest technology that is being introduced with force in the libraries, for electronic management of the collection, implementation of automated check-in and check-out services, among others. The objective of this is to presents the principles of operations of the RFID technology, their components, the barriers for the adoption of the RFID technology and examples of implementation in libraries. The methodology used in this article was an extensive bibliographical and documental research about RFID technology. The results shows thatthe RFID technology are expanding more and more, at world level, in the extent of the libraries, for the facilities that the technology supplies. It conclude that the RFID technology is one of the technologies for libraries automation that they should beconsidered in the hour of updating the technological infrastructure for electronic management of the collection in libraries, considering his crescent adoption at world level due

A tecnologia da informação e comunicação (tic: fator condicionante da inovaçao em bibliotecas universitárias

Directory of Open Access Journals (Sweden)

Rejane M. Ribeiro

2012-01-01

Full Text Available Aborda sobre as inovações em serviços e produtos ocorridas nas Bibliotecas Universitárias (BUs devido à adoção de novas tecnologias de informação e comunicação (TIC. Apresenta a mudança do perfil do bibliotecário e identifica as competências necessárias para que este profissional possa acompanhar e gerenciar essas tecnologias. Palavras-chave Tecnologia da informação e comunicação. Bibliotecas universitárias.Inovação. Abstract Addresses on innovations in products and services that occurred in University Libraries (BUs due to the adoption of new information and communication technologies (ICTs. Presents the changing profile of librarians and identifies the skills required for these professionals to monitor and manage these technologies. Keywords Information technology and communication. University libraries. Innovation.

A multichannel automated chamber system for continuous measurement of forest soil CO2 efflux

International Nuclear Information System (INIS)

Liang, N.; Inoue, G.; Fujinuma, Y.

2003-01-01

Development of a fast-response multi-chamber system for measuring soil-surface carbon dioxide efflux is described. The sixteen-chamber automated system continuously monitors surface carbon dioxide efflux at different locations within a forest ecosystem using a single infrared gas analyzer that successively measures gas samples from each of the sixteen chambers. The chambers have lids that open and close automatically, and are connected in parallel to the single carbon dioxide analyzer which is equipped with a sixteen-channel gas sampler. Air is withdrawn continuously from the inlets and outlets of each chamber and fed sequentially to the gas analyzer. Using this instrument, surface carbon dioxide efflux was measured in a 40-year old pine forest during a three-month period (February to May) in 2001. Results showed a steady increase in mean carbon dioxide efflux during the period. A statistically significant correlation between soil-surface carbon dioxide efflux and surface temperature was also established. Spatial variation of carbon dioxide efflux was found to be higher in the non-growing season than in the growing season. It was concluded that the multi-channel automated chamber system can provide large amounts of high quality data on soil carbon dioxide efflux over a large surface area and simultaneously evaluate both spatial and temporal variation. The system uses a relatively small amount of power (70 W maximum) which can be further reduced (to 15 W) by minimizing the pressure difference between inside and outside the chamber. The system requires no maintenance other than the calibration of the gas analyzer and measurement of the flow rate through the chambers. 34 refs., 8 figs

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.

ACUMULAÇÃO DE COMPETÊNCIA TECNOLÓGICA: ATRAVÉS DO PROCESSO DE TRANSFERÊNCIA DE TECNOLOGIA

Directory of Open Access Journals (Sweden)

André S. de Souza

2006-05-01

Full Text Available

Resumo
O artigo avalia e mensura o acúmulo da competência tecnológica em uma empresa da área de
automação para centros de distribuição, entre o período anterior ao processo de transferência de
tecnologia (1998-2001 e durante o processo de transferência de tecnologia (2002-2005. Assim,
baseado em um estudo de caso individual, o estudo identificou o mecanismo e estratégia de
transferência de tecnologia acordado entre a matriz e filial, as funções tecnológicas e atividades
desenvolvidas pelo receptor e, por fim, os fatores críticos presentes neste processo. O exame da
acumulação de competências tecnológicas foi realizado com base em uma estrutura analítica
existente na literatura. Os resultados obtidos demonstraram que o esforço planejado, organizado,
controlado e contínuo para a geração e disseminação do conhecimento permitiu que a empresa
acelerasse o seu processo de acumulação de competências tecnológicas promovendo a conversão
deste saber do nível individual para o nível organizacional; além disso, permitiram também a
identificação de barreiras e facilitadores envolvidos neste processo.
Palavras-chave: tecnologia, capacidades tecnológicas e transferência de tecnologia.

Abstract
This article evaluates and measures the accumulation of technological competence in a company that
makes projects for warehouses, this study was done before the process of technology transfer (1998-
2001 and during this process (2002 -2005. Thus, based on a study of individual case, this work
identified the mechanism and strategy for technology transfer agreement between the matrix and
subsidiary, the technology functions and activities developed by the recipient and, finally, the critical
factors involved in this process. The examination of the accumulation of

Miniature ionization chamber

International Nuclear Information System (INIS)

Alexeev, V.I.; Emelyanov, I.Y.; Ivanov, V.M.; Konstantinov, L.V.; Lysikov, B.V.; Postnikov, V.V.; Rybakov, J.V.

1976-01-01

A miniature ionization chamber having a gas-filled housing which accommodates a guard electrode made in the form of a hollow perforated cylinder is described. The cylinder is electrically associated with the intermediate coaxial conductor of a triaxial cable used as the lead-in of the ionization chamber. The gas-filled housing of the ionization chamber also accommodates a collecting electrode shaped as a rod electrically connected to the center conductor of the cable and to tubular members. The rod is disposed internally of the guard electrode and is electrically connected, by means of jumpers passing through the holes in the guard electrode, to the tubular members. The tubular members embrace the guard electrode and are spaced a certain distance apart along its entire length. Arranged intermediate of these tubular members are spacers secured to the guard electrode and fixing the collecting electrode throughout its length with respect to the housing of the ionization chamber

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.

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.

As novas tecnologias e o ensino da matemática

OpenAIRE

Rocha, Maria Lúcia

2000-01-01

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Este trabalho apresenta uma análise das novas tecnologias como recurso pedagógico para o ensino de matemática. Para isso foi feito uma síntese da história da introdução dos computadores na escola, bem como os tipos de programas que os professores podem encontrar para utilizarem em suas aulas, e ainda uma síntese da informática no ensino da matemática. O trabalho também apresenta uma visão dos Parâmetros Cu...

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.

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

Tecnologia e educação: trabalho e formação docente Technology and education: work and teacher's education

Directory of Open Access Journals (Sweden)

Raquel Goulart Barreto

2004-12-01

Full Text Available Este trabalho analisa as construções teóricas e ideológicas relativas à precarização de trabalho e formação docente, tendo em vista os discursos que sustentam as políticas em curso. Para tanto, discute: (1 as tecnologias da informação e da comunicação (TIC como elo entre "globalização" e trabalho docente; (2 o modo de inserção dessas tecnologias na chamada "sociedade da informação"; (3 a materialização discursiva de tal inserção; (4 as conseqüências da redução das tecnologias a estratégias de educação a distância, destacando o apartheid educacional produzido; (5 a relação-chave entre tecnologias e competências; e (6 as tendências detectadas no contexto atual: a formação baseada em competências, a ênfase nos materiais instrucionais e a desterritorialização da escola, bem como as propostas contra-hegemônicas.This paper aims at analyzing theoretical and ideological constructions regarding teachers' work and preparation, considering the discourse of current policies. In order to achieve this aim, it discusses: (1 technologies as a link between "globalization" and teaching; (2 a discussion on the ways the so-called "information society" approaches information and communication technologies; (3 the discoursive dimension of this approach; (4 the reduction of technologies to distance learning strategies for teaching certification and the sort of apartheid it brings about; (5 the core relation, between technologies and competencies; and (6 the trends identified in the present context: competency based education, focus on instructional materials and displacement of schools, as well as counter-hegemonic proposals.

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...

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.

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.

Directional muon jet chamber for a muon collider (Groovy Chamber)

International Nuclear Information System (INIS)

Atac, M.

1996-10-01

A directional jet drift chamber with PAD readout is proposed here which can select vertex originated muons within a given time window and eliminate those muons which primarily originate upstream, using only a PAD readout. Drift time provides the Z-coordinate, and the center of gravity of charge distribution provides the r-ψ coordinates. Directionality at the trigger level is obtained by the timing measurement from the PAD hits within a given time window. Because of the long drift time between the bunch crossings, a muon collider enables one to choose a drift distance in the drift chamber as long as 50 cm. This is an important factor in reducing cost of drift chambers which have to cover relatively large areas

Pencil-shaped radiation detection ionization chamber

International Nuclear Information System (INIS)

Suzuki, A.

1979-01-01

A radiation detection ionization chamber is described. It consists of an elongated cylindrical pencil-shaped tubing forming an outer wall of the chamber and a center electrode disposed along the major axis of the tubing. The length of the chamber is substantially greater than the diameter. A cable connecting portion at one end of the chamber is provided for connecting the chamber to a triaxial cable. An end support portion is connected at the other end of the chamber for supporting and tensioning the center electrode. 17 claims

A destruição da imaginação e a permanência da utopia: Desenvolvimento, Tecnologia e Cultura em Roland Corbisier

OpenAIRE

Queluz, Gilson Leandro; Merkle, Luiz Ernesto

2014-01-01

Abordamos neste texto algumas das reflexões desenvolvidas por Roland Corbisier sobre as técnicas em suas relações com as sociedades. Com destaque aos seus escritos do período da ditadura militar, procuraremos demonstrar que Corbisier problematizou temáticas que envolviam as relações entre tecnologia, desenvolvimento e cultura, técnica e colonialismo, técnica e política, tecnologia e imaginação, técnica e violência, dentre outras. Constatamos o trânsito de Corbisier de uma percepção marcadamen...

Estudo de métodos de avaliação de tecnologias em saúde aplicada a equipamentos eletromédicos

OpenAIRE

Sônego, Fernando Santos

2007-01-01

Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Elétrica. Esta pesquisa apresenta uma metodologia de avaliação de tecnologias em saúde baseada na Portaria 1.229/GM do Ministério da Saúde e nos métodos de avaliação tecnológica existentes. Auxiliando assim, a engenharia clínica na gestão da tecnologia médico-hospitalar, através da execução de atividades de avaliação de equipamentos eletromédicos. . Nas etapas deste ...

Improvement of Swirl Chamber Structure of Swirl-Chamber Diesel Engine Based on Flow Field Characteristics

Directory of Open Access Journals (Sweden)

Wenhua Yuan

2014-10-01

Full Text Available In order to improve combustion characteristic of swirl chamber diesel engine, a simulation model about a traditional cylindrical flat-bottom swirl chamber turbulent combustion diesel engine was established within the timeframe of the piston motion from the bottom dead centre (BDC to the top dead centre (TDC with the fluent dynamic mesh technique and flow field vector of gas in swirl chamber and cylinder; the pressure variation and temperature variation were obtained and a new type of swirl chamber structure was proposed. The results reveal that the piston will move from BDC; air in the cylinder is compressed into the swirl chamber by the piston to develop a swirl inside the chamber, with the ongoing of compression; the pressure and temperature are also rising gradually. Under this condition, the demand of diesel oil mixing and combusting will be better satisfied. Moreover, the new structure will no longer forma small fluid retention zone at the lower end outside the chamber and will be more beneficial to the mixing of fuel oil and air, which has presented a new idea and theoretical foundation for the design and optimization of swirl chamber structure and is thus of good significance of guiding in this regard.

The radiological safety in the use of nuclear technique -activities developed by Centro de Desenvolvimento da Tecnologia Nuclear - CNEN

International Nuclear Information System (INIS)

Wakabayashi, T.; Pereira, E.G.; Hirayama, T.

1991-01-01

The activities developed by the Centro de Desenvolvimento da Tecnologia Nuclear - CDTN supporting the users of nuclear techniques are described. The methodology used and future plans for the group are shown. (E.G.)

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.

Establishment of a radon test chamber

International Nuclear Information System (INIS)

Chen Chingjiang; Liu Chichang; Lin Yuming

1993-01-01

A walk-in type radon test chamber of 23 m 3 has been built for testing and calibration of radon measurement instruments. The environmental conditions of the test chamber can be varied within a wide range of values. The design objectives specification, monitoring instruments and testing results of this chamber are discussed. This test chamber is available for domestic radon researchers and its accuracy can be traced to the international standard. A routine intercomparison study will be held annually by using this chamber. Other tests like radon progeny and thoron standard may also be performed in this chamber. (1 fig.)

Geladeira e fogão também são desenvolvidos: desmistificando a banalização das tecnologias domésticas

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José Carlos do Amaral Junior

2013-01-01

Full Text Available Habita o discurso do senso comum a ideia de que as atividades domésticas, bem como as tecnologias ligadas a estas, são de natureza simples. Este discurso reproduz a desigualdade de gênero existente entre homens e mulheres, a invisibilidade do trabalho doméstico e a desvalorização do trabalho não produtivo no sentido capitalista do termo. Dessa maneira, o objetivo deste artigo foi mostrar através de um breve ensaio teórico que o trabalho doméstico, bem como as tecnologias nele envolvidas, são de natureza complexa e exigem das empresas fabricantes de tais tecnologias considerável investimento no desenvolvimento de tais produtos. É possível concluir que, eletrodomésticos como geladeira e fogão também exigem desenvolvimento detalhado, em um processo tão ou talvez até mesmo mais complexo do que aqueles  adotados na concepção de  softwares e eletrônicos.

Vantagens do uso de tecnologias para criação, armazenamento e disseminação do conhecimento em bibliotecas universitárias

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Emeide Nóbrega Duarte

Full Text Available Com base em resultado de pesquisa que investigou, nas bibliotecas universitárias, entre outras questões, a dimensão tecnologia proposta pelo modelo de Organizações do Conhecimento apresentado por Angeloni, percebe-se que a tecnologia aplicada restringe-se ao uso das ferramentas Internet e Intranet para possibilitar a comunicação em redes. Identificou-se, portanto, o desconhecimento teórico das ferramentas data warehouse, groupware, workflow e gerenciamento eletrônico de documentos. Assim, busca-se destacar, no artigo, o papel da rede de computador - Internet, Intranet, Extranet, Data Warehouse, Groupware, Workflow e gerenciamento eletrônico de documentos - a fim de promover a aprendizagem, visando ao conhecimento conceitual de sua prática, rumo às organizações do conhecimento. Os bibliotecários, assim como outros profissionais da informação, atuam como gestores do conhecimento. Nesse sentido, devem adotar o uso da tecnologia da informação e suas ferramentas para facilitar o processo de criação, armazenamento e disseminação do conhecimento.

The effect of humidity on the measurements with a well type chamber

International Nuclear Information System (INIS)

2001-01-01

that the request is not limited to identical well type chambers as that at the IAEA Dosimetry Laboratory, nor is it limited to chambers that are open to ambient conditions. Thus, also sealed chambers can be used in the measurements. A summary of the results will be presented in a forthcoming issue of the SSDL Newsletter. The contributors will be acknowledged

National Ignition Facility Target Chamber

International Nuclear Information System (INIS)

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

2000-01-01

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 was

GeoServer: il server geospaziale Open Source novità della nuova versione 2.3.0

Directory of Open Access Journals (Sweden)

Simone Giannecchini

2013-04-01

Full Text Available GeoServer è un server geospaziale Open Source sviluppato con tecnologia Java Enterprise per la gestione e l’editing di dati geospaziali secondo gli standard OGC e ISO Technical Committee 211. Esso fornisce le funzionalità di base per creareinfrastrutture spaziali di dati (SDI ed è progettato per essere interoperabile potendo pubblicare dati provenienti da ogni tipo di fonte spaziale utilizzando standard aperti.Open Source GeoSpatial server developed with Java Enterprise technology for managing, sharing and editing geospatial data according to the OGC and ISO TC 211 standards. GeoServer provides the basic functionalities to create spatial data infrastructures (SDI.GeoServer is designed for interoperability, it publishes data from any major spatial data source using open standards: it is the reference implementation of the Open Geospatial Consortium (OGC Web Feature Service (WFS and Web Coverage Service (WCS standards, as well as a highperformance certified compliant Web Map Service (WMS. GeoServer forms a core component of the Geospatial Web.

Cloud Chamber

DEFF Research Database (Denmark)

Gfader, Verina

Cloud Chamber takes its roots in a performance project, titled The Guests 做东, devised by Verina Gfader for the 11th Shanghai Biennale, ‘Why Not Ask Again: Arguments, Counter-arguments, and Stories’. Departing from the inclusion of the biennale audience to write a future folk tale, Cloud Chamber......: fiction and translation and translation through time; post literacy; world picturing-world typing; and cartographic entanglements and expressions of subjectivity; through the lens a social imaginary of worlding or cosmological quest. Art at its core? Contributions by Nikos Papastergiadis, Rebecca Carson...

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.

Gestão de tecnologia em universidades: uma análise do patenteamento e dos fatores de dificuldade e de apoio à transferência de tecnologia no Estado de São Paulo Technology management in universities: an analysis of patenting and support and difficulty factors in technology transfer in São Paulo State

Directory of Open Access Journals (Sweden)

Leonardo Augusto Garnica

2009-12-01

Full Text Available A gestão da tecnologia nas universidades públicas brasileiras tem ganhado crescente importância para o sistema de inovação brasileiro. A Lei de Inovação de 2004 forneceu diretrizes legais específicas acerca da propriedade intelectual, cooperação técnica e transferência tecnológica favorecendo a intensificação desses processos. O objetivo deste trabalho foi apreender as políticas institucionais e os desafios para a transferência de tecnologia em universidades públicas do Estado de São Paulo, a saber: USP, Unesp, Unicamp, Unifesp e UFSCar, buscando identificar fatores de dificuldade e de apoio em processos de transferência de tecnologia observados pelos agentes das universidades e empresas parceiras. A pesquisa, de tipo qualitativa, utilizou-se da estratégia de estudo multicaso e por meio da realização de entrevistas a respeito de contratos de transferência de tecnologia foi realizada análise comparativa das universidades. Verificou-se um crescimento do patenteamento e da atividade de comercialização de tecnologia em todos os casos, porém ainda recentes.Technology management in Brazilian public universities has gained increasing importance within the Brazilian innovation system. The Innovation Act of 2004 provides specific legal guidance on intellectual property, technical cooperation and technology transfer, favoring the intensification of these processes. The objective of this work was to understand the institutional policies and challenges for technology transfer in the public universities, as well as to identify forces and obstacles related to technology commercialization. The kind of analyses was qualitative, and for the empirical part of the work, the strategy of case studies was used in institutions such as: USP, Unesp, Unicamp, Unifesp e UFSCar. Using technology transfer contracts from each one of them, this article reveals key aspects, forces and obstacles within that practice. An increase in intellectual

Development of the Experiment Control System and Performance Study of the Muon Chambers for the LHCb Experiment

CERN Document Server

Antunes Nobrega, R; Penso, G; Pinci, D

2010-01-01

The work of this thesis practically opened three fronts of the LHCb muon system : the development of the control and monitoring system of the readout electronics; the study of noise and threshold of the detector; and the study of the performance of the muon chambers. The LHCb muon readout apparatus is made 1368 Multi-Wire Proportional Chambers (MWPC) and 24 Gas Electron Multiplier (GEM) chambers connected to approximately 7500 16-channel front-end boards, resulting in 120000 output channels. The large-scale of this system naturally led to a complex control and monitoring system made of about 600 microcontrollers which are directly connected to the front-end electronics and handled by six computers. The development of this control system was accomplished within this thesis; the microcontroller’s firmware and the high level software, operating on the six local computers, were implemented. Besides configuring and monitoring the on-chamber readout electronics, a set of calibration and debugging oriented procedu...

Optimization of combustion chamber geometry for stoichiometric diesel combustion using a micro genetic algorithm

Energy Technology Data Exchange (ETDEWEB)

Park, Sung Wook

2010-11-15

This paper describes the optimization of combustion chamber geometry and engine operating conditions for stoichiometric diesel combustion, targeting lower gross indicated specific fuel consumption. The KIVA code, coupled with a micro genetic algorithm population of nine for each generation was used. The optimization variables were composed of ten variables related to the combustion chamber geometry and engine operating conditions. In addition, an auto mesh generator was developed for generating various kinds of combustion chambers, such as open-crater, re-entrant, deep, and shallow types. In addition, the computational models were validated against the experimental results for a stoichiometric process in terms of the combustion pressure history and emissions. Through the preset optimization, a 35% improvement in the gross indicated that specific fuel consumption was achieved. In addition, the optimization results showed that the optimum engine operating conditions employed a premixed charge compression ignition combustion regime with early injection and a narrow spray included angle. Furthermore, a higher boost pressure was used to prevent fuel film formation. (author)

A COMISSÃO NACIONAL DE INCORPORAÇÃO DE TECNOLOGIAS NO SUS: UM BALANÇO DOS PRIMEIROS ANOS DE ATUAÇÃO

Directory of Open Access Journals (Sweden)

Roberta Buarque Rabelo

2015-10-01

Full Text Available O Sistema Único de Saúde (SUS foi criado com o objetivo de oferecer à sociedade brasileira o acesso universal, integral e gratuito aos serviços de saúde. A integralidade é um dos temas que mais despertam polêmica no contexto das avaliações e uso das novas tecnologias no SUS. Em resposta a um movimento iniciado em 2009, visando à adoção de medidas imediatas para o aumento da transparência no processo de avaliação das tecnologias em saúde e a instituição de procedimentos para acompanhar a sua evolução, foi instituída, por lei federal, a Comissão Nacional de Incorporação de Tecnologias no SUS (CONITEC. Assim, a Avaliação de Tecnologias em Saúde (ATS foi institucionalizada no Brasil como processo obrigatório e indispensável para a tomada de decisão sobre a incorporação tecnológica no SUS. Este artigo é um relato de experiência, que descreve dados relacionados à atuação da CONITEC desde a sua implantação. O trabalho desenvolvido por essa comissão reflete o compromisso com o acesso integral e equânime assumido pela sociedade brasileira na Constituição de 1988, sendo um passo decisivo para os direitos sociais e para uma sociedade mais justa e comprometida com o acesso à saúde e com o conhecimento a serviço da população.

TECNOLOGIAS DIGITAIS: PROMOVENDO O DESENVOLVIMENTO SUSTENTÁVEL PARA O JOVEM DO CAMPO

OpenAIRE

Zarpelon, Mirian Cátia; Kolcenti, Cassiane; Balestrin, Deisi; Tortelli, Luana; Blazszack, Vinicíus; Guedes, Anibal Lopes

2015-01-01

O desenvolvimento sustentável é hoje em dia, um dos principais desafios a ser enfrentado na atualidade. Inclui-se neste universo a agricultura, através da consolidação das atividades produtivas a fim de desenvolver de forma sustentável, a gestão da propriedade rural, bem como sua condição ambiental e social, sem degradar o capital natural e mantendo o bem estar da sociedade. Dentro desse processo, as novas tecnologias proporcionam o desenvolvimento de soluções criativas simples que visam melh...

SU-F-T-05: Dosimetric Evaluation and Validation of Newlydeveloped Well Chamber for Use in the Calibration of Brachytherapy Sources

Energy Technology Data Exchange (ETDEWEB)

Saminathan, S; Godson, H; Ponmalar, R; Manickam, R [Kidwai Memorial Institute of Oncology, Bangalore, Karnataka (India); Mazarello, J [Rosalina India private limited, Mumbai, Maharastra (India)

2016-06-15

Purpose: To evaluate the dosimetric characteristics of newly developed well type ionization chamber and to validate the results with the commercially available calibrated well chambers that are being used for the calibration of brachytherapy sources. Methods: The newly developed well type ionization chamber (BDS 1000) has been designed for the convenient use in brachytherapy which is open to atmospheric condition. The chamber has a volume of 240 cm3 and weight of 2.5 Kg. The calibration of the radioactive source with activities from 0.01 mCi to 20 Ci can be carried out using this chamber. The dosimetric parameters such as leakage current, stability, scattering effect, ion collection efficiency, reference air kerma rate and nominal response with energy were carried out with the BDS 1000 well type ion chamber. The evaluated dosimetric characteristics of BDS1000 well chamber were validated with two other commercially available well chambers (HDR 1000 plus and BTC/3007). Results: The measured leakage current observed was negligible for the newly developed BDS 1000 well type ion chamber. The ion collection efficiency was close to 1 and the response of the chamber was found to be very stable. The determined sweet spot was at 42 mm from bottom of the chamber insert. The reference air kerma rate was found to be 4.634 × 105 Gym2hr-1A-1 for the BDS 1000 well chamber. The overall dosimetric characteristics of BDS 1000 well chamber was in good agreement with the dosimetric properties of other two well chambers. Conclusion: The dosimetric study shows that the newly developed BDS 1000 well type ionization chamber is high sensitive and reliable chamber for reference air kerma strength calibration. The results obtained confirm that this chamber can be used for the calibration of HDR and LDR brachytherapy sources.

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.

Influence of ambient air toxics in open-top chambers on the monoterpene emission of Picea abies. Diurnal and seasonal variation of emissions, and differentiation of needles and bark as emission sources. Der Einfluss natuerlich-phytotoxischer Luft auf die Monoterpen-Emission bei Picea abies in Open-Top-Kammern. Tages- und Jahresgang der Emission und Differenzierung von Nadel- und Rindenemissionen

Energy Technology Data Exchange (ETDEWEB)

Juettner, F. (Max-Planck-Institut fuer Limnologie, Ploen (Germany, F.R.). Abt. Oekophysiologie)

1990-04-01

Open-top chambers, in which each a 19-years old spruce tree (Picea abies) was growing, were used to determine monoterpene emissions by mass fragmentography. The annual dynamics of the monoterpene emissions corresponded to the air temperature. However, the diurnal dynamics did not follow the course of the temperature. Physiological reactions of the needles are responsible for the temperature independent emission of monoterpenes during the day. (orig.).

Contação de história: tecnologia cuidativa na educação permanente para o envelhecimento ativo

Directory of Open Access Journals (Sweden)

Nadia Pinheiro da Costa

Full Text Available RESUMO Objetivo: avaliar pertinência e efetividade da tecnologia cuidativo-educacional "contação de histórias" como estratégia no cultivo do envelhecimento ativo (EA para usuários idosos de uma Unidade Básica de Saúde (UBS, da Amazônia. Método: Pesquisa Convergente Assistencial (PCA, realizada em UBS de Belém, estado do Pará, com oito idosas para testagem da tecnologia. Aplicou-se questionário de avaliação do EA e WHOQOL - breve, avaliação de qualidade de vida. Após capacitação com vistas à educação permanente, idosas contaram histórias para uma plateia que se manifestou respondendo à pergunta: "O que você tirou dela para a sua vida?" Resultados: histórias populares contadas provocaram reações das quais emergiram as categorias: Solidariedade; Respeito ao outro; Imaginação, sonhos, esperança e Cultura do imaginário amazônida. Tal prática resultou positiva, com mudança na qualidade de vida das idosas, no domínio psicológico. Conclusão: "contação de histórias" revelou-se uma tecnologia inovadora, recurso pertinente e efetivo à educação em saúde, especialmente para o envelhecimento ativo.

Novas e velhas tecnologias: o desafio da regulação

Directory of Open Access Journals (Sweden)

Geraldo Lucchese

2018-05-01

Full Text Available Em que época vivemos! A ciência avança em grande velocidade. A tecnologia oferece novos materiais, produtos, serviços, processos. Alguns em fase ainda experimental, outros em pleno uso. Tecnologias poderosas, como a engenharia genética, que permitem mani-pular os códigos genéticos de qualquer espécie, são instrumentos capazes de intervir na natureza de forma dramática. Clonagens já são possíveis em grandes animais e, possi-velmente, em humanos. Organismos geneticamente modificados são amplamente produ-zidos e constituem matéria-prima para o processamento de alimentos em larga escala. Materiais nanoparticulados apresentam propriedades físico-químicas completamente diferentes das dos materiais que lhes dão origem e também já são amplamente utiliza-dos, principalmente nas áreas farmacêutica, cosmética e de alimentos. Células-tronco, com poder de diferenciação celular, trazem perspectivas de terapias inéditas para males que não contam com alternativas terapêuticas, mas apresentam, além de sérios proble-mas técnicos, questões éticas, morais e religiosas. A biotecnologia e o armazenamento e processamento de informações por meio eletrônico confirmam a nova onda tecnológica que provoca uma verdadeira revolução; mudam processos produtivos, profissões, orga-nizações, instituições, sistemas de controle, gestão de empresas e do Estado. Muitos e grandes interesses estão em jogo.

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.

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.

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.

Criteria for controlled atmosphere chambers

International Nuclear Information System (INIS)

Robinson, J.N.

1980-03-01

The criteria for design, construction, and operation of controlled atmosphere chambers intended for service at ORNL are presented. Classification of chambers, materials for construction, design criteria, design, controlled atmosphere chamber systems, and operating procedures are presented. ORNL Safety Manual Procedure 2.1; ORNL Health Physics Procedure Manual Appendix A-7; and Design of Viewing Windows are included in 3 appendices

Fluorescent and high intensity discharge lamp use in chambers and greenhouses

Energy Technology Data Exchange (ETDEWEB)

Langhans, R.W. [Cornell Univ., Ithaca, NY (United States)

1994-12-31

Fluorescent and High Intensity Discharge lamps have opened up great opportunities for researchers to study plant growth under controlled environment conditions and for commercial growers to increase plant production during low/light periods. This report describes the advantages and disadvantages of using each lamp in growth chambers, growth rooms and greenhouses. Growth Chambers are small (3m x 4/m and smaller) walk-in or reach-in enclosures with programmable, accurate temperature, relative humidity (RH) and irradiance control over wide ranges. The intent of growth chambers was to replicate sunlight conditions and transfer research results directly to the greenhouse or outside. It was realized that sunlight and outside conditions could not be mimicked. Growth chambers are also used to study irradiance and spectral fluxes. Growth Rooms are usually large rooms (larger than 3m x 4m) with only lamp irradiance, but providing relatively limited ranges of environmental control (i.e., 10 to 30 C temperature, 50 to 90% RH and ambient to 1000 ppm CO{sub 2}), and commonly independent of outside conditions. Irradiance requirements for growth rooms are similar to those of growth chambers. Growth rooms are also used for growing a large number of plants in a uniform standard environment condition and in commercial horticulture for tissue culture, seed germination (plugs) and seedling growth. Greenhouses are designed to allow maximum sunlight penetration through the structure. Initially greenhouses were used to extend the growing season. Then as heating systems, and cooling systems improved, they were used year round. Low light during the winter months reduced plant growth, but with the advent of efficient lamps (HID and fluorescent) it became possible to increase growth to rates close to that in summer months. Supplementary lighting is used during low light periods of the year and anytime to ensure consistent total daily irradiance for research plants.

Trajetórias tecnológicas da indústria de telefonia móvel: um exame prospectivo de tecnologias emergentes

Directory of Open Access Journals (Sweden)

Celso Neris Jr.

2014-05-01

Full Text Available A indústria de telequipamentos, em especial a de telefonia móvel, passou por transformações importantes nos últimos anos. A estrutura e as fronteiras do mercado foram modificadas pela introdução de inovações de produtos por empresas que há pouco atuavam em outros setores do complexo das Tecnologias de Informação e Comunicação (TICs. Este estudo procura descrever este processo, analisando três aspectos da indústria: (i as trajetórias tecnológicas, (ii o surgimento de novas tecnologias e (iii a inserção de novos atores na produção internacional de conhecimento. Para fazê-lo, o trabalho revisa a literatura sobre inovações nesta indústria para, a seguir, identificar, descrever e avaliar os atores e as tecnologias promissoras. Definida uma amostra de novas tecnologias, o trabalho sistematiza suas características e procede à análise bibliométrica de três delas - protocolo de internet (IPv6, rede sem fio (802.11n e transmissão de dados a curta distância (NFC. Além de estabelecer a metodologia adotada como um interessante instrumento de prospecção tecnológica, os resultados encontrados permitem duas conclusões principais. A primeira aponta que as oportunidades abertas pelo surgimento de novas trajetórias desencadearam um processo que está permitindo a entrada de novos atores, especialmente de empresas vindas de outras atividades no campo das TICs e que tornam imprecisas as fronteiras dos mercados e alteram o desempenho e a estratégia de empresas já consolidadas e líderes do setor. A segunda sugere que os EUA buscam recuperar a hegemonia perdida e que a Ásia está definitivamente inserida na produção de conhecimento científico-tecnológico relevante nesta indústria.

Proceedings of workshop on streamer chamber

International Nuclear Information System (INIS)

Itoh, Hidihiko; Takahashi, Kaoru; Hirose, Tachishige; Masaike, Akira

1978-08-01

For high accuracy observation of multiple-body reactions, a vertex detector of high efficiency is essential. A bubble chamber, though excellent for tracks detection, is problematic in statistics accuracy. The vertex detector with a wire chamber, while better in this respect, difficult in multiple-particle detection etc. The workshop has had several meetings on a streamer chamber as a detector combining features of both bubble chamber and counter, with emphasis on tracks observation in avalanche mode and recordings not using films. Contents are on streamer chamber gas, analytical photography, data processing, simulation program, etc. (Mori, K.)

Sympathetic stimulation alters left ventricular relaxation and chamber size.

Science.gov (United States)

Burwash, I G; Morgan, D E; Koilpillai, C J; Blackmore, G L; Johnstone, D E; Armour, J A

1993-01-01

Alterations in left ventricular (LV) contractility, relaxation, and chamber dimensions induced by efferent sympathetic nerve stimulation were investigated in nine anesthetized open-chest dogs in sinus rhythm. Supramaximal stimulation of acutely decentralized left stellate ganglia augmented heart rate, LV systolic pressure, and rate of LV pressure rise (maximum +dP/dt, 1,809 +/- 191 to 6,304 +/- 725 mmHg/s) and fall (maximum -dP/dt, -2,392 +/- 230 to -4,458 +/- 482 mmHg/s). It also reduced the time constant of isovolumic relaxation, tau (36.5 +/- 4.8 to 14.9 +/- 1.1 ms). Simultaneous two-dimensional echocardiography recorded reductions in end-diastolic and end-systolic LV cross-sectional chamber areas (23 and 31%, respectively), an increase in area ejection fraction (32%), and increases in end-diastolic and end-systolic wall thicknesses (14 and 13%, respectively). End-systolic and end-diastolic wall stresses were unchanged by stellate ganglion stimulation (98 +/- 12 to 95 +/- 9 dyn x 10(3)/cm2; 6.4 +/- 2.4 to 2.4 +/- 0.3 dyn x 10(3)/cm2, respectively). Atrial pacing to similar heart rates did not alter monitored indexes of contractility. Dobutamine and isoproterenol induced changes similar to those resulting from sympathetic neuronal stimulation. These data indicate that when the efferent sympathetic nervous system increases left ventricular contractility and relaxation, concomitant reductions in systolic and diastolic dimensions of that chamber occur that are associated with increasing wall thickness such that LV wall stress changes are minimized.

Gridded Ionization Chamber

International Nuclear Information System (INIS)

Manero Amoros, F.

1962-01-01

In the present paper the working principles of a gridded ionization chamber are given, and all the different factors that determine its resolution power are analyzed in detail. One of these devices, built in the Physics Division of the JEN and designed specially for use in measurements of alpha spectroscopy, is described. finally the main applications, in which the chamber can be used, are shown. (Author) 17 refs

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).

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

Absorbed dose measurement by using tissue equivalent ionization chamber (pair ionization chamber) in the Yayoi reactor

International Nuclear Information System (INIS)

Sasuga, N.; Okamura, K.; Terakado, T.; Mabuchi, Y.; Nakagawa, T.; Sukegawa, Toshio; Aizawa, C.; Saito, I.; Oka, Yoshiaki

1998-01-01

Each dose rate of neutron and gamma ray in the thermal column of the Yayoi reactor, in which an epithermal neutron field will be used for the boron neutron capture therapy, was measured by using a tissue equivalent ionization chamber and a graphite chamber. The tissue equivalent ionization chamber has some response to both neutron and gamma ray, but the graphite chamber has a few response to the neutron, so called pair ionization chamber method. The epithermal neutron fluxes of the thermal column were calculated by ANISN (one dimensional neutron-gamma transport code). A measured value for gamma dose rate by the pair ionization chamber agrees relevantly with a calculated result. For neutron dose rate, however, the measured value was too much small in comparison with the calculated result. The discrepancy between the measured value and the calculated result for neutron dose rate is discussed in detail in the report. (M. Suetake)

Development of secondary chamber for tar cracking-improvement of wood pyrolysis performance in pre-vacuum chamber

Science.gov (United States)

Siahaan, S.; Homma, H.; Homma, H.

2018-02-01

Energy crisis and global warming, in other words, climate change are critical topics discussed in various parts of the world. Global warming primarily result from too much emission of carbon dioxide (CO2) in the atmosphere. To mitigate global warming, or climate change and improve electrification in rural areas, wood pyrolysis technology is developed in a laboratory scale, of which gases are directly applicable to the gas engine generator. Our laboratory has developed a prototype of wood pyrolysis plant with a pre-vacuum chamber. However, tar yield was around 40 wt% of feedstock. This research aims to reduce tar yield by secondary tar cracking. For the secondary tar cracking, a secondary pre-vacuum chamber is installed after primary pre-vacuum chamber. Gases generated in the primary pre-vacuum chamber are lead into the secondary chamber that is heated up to 1000 K. This paper reports performance of the secondary chamber for secondary tar cracking in homogeneous mode and heterogeneous mode with char.

Pulsed fusion space propulsion: Computational Magneto-Hydro Dynamics of a multi-coil parabolic reaction chamber

Science.gov (United States)

Romanelli, Gherardo; Mignone, Andrea; Cervone, Angelo

2017-10-01

Pulsed fusion propulsion might finally revolutionise manned space exploration by providing an affordable and relatively fast access to interplanetary destinations. However, such systems are still in an early development phase and one of the key areas requiring further investigations is the operation of the magnetic nozzle, the device meant to exploit the fusion energy and generate thrust. One of the last pulsed fusion magnetic nozzle design is the so called multi-coil parabolic reaction chamber: the reaction is thereby ignited at the focus of an open parabolic chamber, enclosed by a series of coaxial superconducting coils that apply a magnetic field. The field, beside confining the reaction and preventing any contact between hot fusion plasma and chamber structure, is also meant to reflect the explosion and push plasma out of the rocket. Reflection is attained thanks to electric currents induced in conductive skin layers that cover each of the coils, the change of plasma axial momentum generates thrust in reaction. This working principle has yet to be extensively verified and computational Magneto-Hydro Dynamics (MHD) is a viable option to achieve that. This work is one of the first detailed ideal-MHD analysis of a multi-coil parabolic reaction chamber of this kind and has been completed employing PLUTO, a freely distributed computational code developed at the Physics Department of the University of Turin. The results are thus a preliminary verification of the chamber's performance. Nonetheless, plasma leakage through the chamber structure has been highlighted. Therefore, further investigations are required to validate the chamber design. Implementing a more accurate physical model (e.g. Hall-MHD or relativistic-MHD) is thus mandatory, and PLUTO shows the capabilities to achieve that.

The OpenPicoAmp: an open-source planar lipid bilayer amplifier for hands-on learning of neuroscience.

Science.gov (United States)

Shlyonsky, Vadim; Dupuis, Freddy; Gall, David

2014-01-01

Understanding the electrical biophysical properties of the cell membrane can be difficult for neuroscience students as it relies solely on lectures of theoretical models without practical hands on experiments. To address this issue, we developed an open-source lipid bilayer amplifier, the OpenPicoAmp, which is appropriate for use in introductory courses in biophysics or neurosciences at the undergraduate level, dealing with the electrical properties of the cell membrane. The amplifier is designed using the common lithographic printed circuit board fabrication process and off-the-shelf electronic components. In addition, we propose a specific design for experimental chambers allowing the insertion of a commercially available polytetrafluoroethylene film. We provide a complete documentation allowing to build the amplifier and the experimental chamber. The students hand-out giving step-by step instructions to perform a recording is also included. Our experimental setup can be used in basic experiments in which students monitor the bilayer formation by capacitance measurement and record unitary currents produced by ionic channels like gramicidin A dimers. Used in combination with a low-cost data acquisition board this system provides a complete solution for hands-on lessons, therefore improving the effectiveness in teaching basic neurosciences or biophysics.

Proportional chamber with data analog output

International Nuclear Information System (INIS)

Popov, V.E.; Prokof'ev, A.N.

1977-01-01

A proportional multiwier chamber is described. The chamber makes it possible to determine angles at wich a pion strikes a polarized target. A delay line, made of 60-core flat cable is used for removing signals from the chamber. From the delay line, signals are amplified and successively injected into shapers and a time-to-amplitude converter. An amplitude of the time-to amplitude converter output signal unambiguously determines the coordinate of a point at which a particle strikes the chamber plane. There are also given circuits of amplifiers, which consist of a preamplifier with gain 30 and a main amplifier with adjustable gain. Data on testing the chamber with the 450 MeV pion beam is demonstrated. The chamber features an efficiency of about 98 per cent under load of 2x10 5 s -1

As tecnologias de informação e comunicação na indústria de construção portuguesa: caracterização da sua utilização e análise do impacto no desempenho das empresas

OpenAIRE

Marques, Rui Miguel de Lima Victor Sousa

2009-01-01

Dissertação apresentada na Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa para a obtenção do grau de Mestre em Engenharia Civil – Perfil de Construção A falta de informação acerca dos benefícios das novas tecnologias, juntamente com a incerteza associada às vantagens competitivas das Tecnologias de Informação e Comunicação (TIC) e a diversidade de processos característica da indústria da construção, resultou numa resistência à implementação de tecnologia por parte das em...

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.

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

Proton beam monitor chamber calibration

International Nuclear Information System (INIS)

Gomà, C; Meer, D; Safai, S; Lorentini, S

2014-01-01

The first goal of this paper is to clarify the reference conditions for the reference dosimetry of clinical proton beams. A clear distinction is made between proton beam delivery systems which should be calibrated with a spread-out Bragg peak field and those that should be calibrated with a (pseudo-)monoenergetic proton beam. For the latter, this paper also compares two independent dosimetry techniques to calibrate the beam monitor chambers: absolute dosimetry (of the number of protons exiting the nozzle) with a Faraday cup and reference dosimetry (i.e. determination of the absorbed dose to water under IAEA TRS-398 reference conditions) with an ionization chamber. To compare the two techniques, Monte Carlo simulations were performed to convert dose-to-water to proton fluence. A good agreement was found between the Faraday cup technique and the reference dosimetry with a plane-parallel ionization chamber. The differences—of the order of 3%—were found to be within the uncertainty of the comparison. For cylindrical ionization chambers, however, the agreement was only possible when positioning the effective point of measurement of the chamber at the reference measurement depth—i.e. not complying with IAEA TRS-398 recommendations. In conclusion, for cylindrical ionization chambers, IAEA TRS-398 reference conditions for monoenergetic proton beams led to a systematic error in the determination of the absorbed dose to water, especially relevant for low-energy proton beams. To overcome this problem, the effective point of measurement of cylindrical ionization chambers should be taken into account when positioning the reference point of the chamber. Within the current IAEA TRS-398 recommendations, it seems advisable to use plane-parallel ionization chambers—rather than cylindrical chambers—for the reference dosimetry of pseudo-monoenergetic proton beams. (paper)

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

A integração bilateral Brasil-Argentina: tecnologia nuclear e Mercosul

OpenAIRE

Oliveira, Odete Maria de

1998-01-01

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 n...

House Magazine: open source architecture

Directory of Open Access Journals (Sweden)

Andrés Passaro

2016-11-01

Full Text Available A popularização das novas tecnologias de fabricação digital vêm alterando os modos de produção da sociedade contemporânea. O compartilhamento aberto de informações, dentro de uma nova lógica produtiva, tem o potencial de mudar o sistema econômico vigente, e de até transformar os rumos da globalização em curso. O presente trabalho aborda um novo sistema construtivo de fonte aberta que utiliza a fabricação digital na produção de habitações de baixo custo. O projeto Casa Revista, desenvolvido no laboratório LAMO3D da FAU-UFRJ, tem como objetivo alimentar a renovação da produção independente de habitações, inserindo uma nova tecnologia construtiva no vocabulário popular e explorando seus potenciais. Baseado no sistema WikiHouse de construção, o projeto alia conhecimento global à produção local, tropicalizando o seu conteúdo. A experiência contou com a prototipagem em escala real de um primeiro modelo, usinado e montado por estudantes da graduação, a fim de testar a qualidade do sistema e sua viabilidade técnica de implementação como tecnologia social. O projeto mostrou-se intuitivo, de complexidade simples e rico em possibilidades de manipulação e aperfeiçoamento. São os projetos e tecnologias de fonte aberta que vêm promovendo o alargamento de usos do conhecimento por novos atores, gerando uma dispersão da produção. Cabe a nós arquitetos reconhecermos esse potencial e moldar suas infinitas possibilidades de aplicação.

Gestão, planejamento e avaliação de políticas de ciência e tecnologia: hora de rever? Management, planning and assessment of science and technology policies: time to review?

Directory of Open Access Journals (Sweden)

Marília Bernardes Marques

1999-01-01

Full Text Available O presente artigo aborda o tema das políticas de ciência e tecnologia e as questões relativas à sua gestão, planejamento e avaliação. Revisa a trajetória da ciência e tecnologia nas cinco últimas décadas deste século, analisando como a ciência voltou-se progressivamente para os mercados e empresas de alta tecnologia, ao mesmo tempo em que cresceria a intervenção do Estado dirigida à integração da ciência e da tecnologia ao conjunto da economia. A seguir, analisa a noção de sistema nacional de inovação e suas relações com o tema das políticas de ciência e tecnologia. O texto finaliza retomando o problema dos limites e dos rumos da ação governamental sobre a ciência e a tecnologia nos países em desenvolvimento e subdesenvolvidos.This article addresses the issue of science and technology policies as well as its management and evaluation. Reviews the trajectory of science and technology during the last five decades of this century and analyses how science has progressively turned to the markets and to high-tech firms, simultaneously to the increase in the governmental intervention steered to integrate science and technology in the whole economy. It also analyses the notion of national innovation system and its relations with the science and technology policies. To conclude, the paper considers the problem of the limits and trends of the governmental action directed to science and technology in developing and underdeveloped countries.

Bibliotecas, usuários e tecnologias info-comunicacionais: perspectivas e transformações

Directory of Open Access Journals (Sweden)

Walqueline Silva Araújo

2015-01-01

Full Text Available Este artigo objetiva refletir sobre as transformações sociais e culturais do processo de consolidação da cibercultura, decorrentes da inserção e popularização das Tecnologias Digitais de Informação e Comunicação na sociedade, bem como as contribuições dessas tecnologias como canal mediador para a troca de informações entre as bibliotecas e seu público-alvo. A reflexão busca ponderar sobre as perspectivas e transformações nas formas de se relacionar que ferramentas como as mídias sociais têm possibilitado por meio da internet, buscando destacar aspectos essenciais que envolvem a biblioteca universitária e o usuário da informação. Utiliza como instrumento de pesquisa uma revisão bibliográfica, sendo realizada uma pesquisa bibliográfica e documental em fontes como livros e periódicos científicos eletrônicos de leitura corrente, com vistas a apresentar os conceitos e definições do tema abordado. Consideramos que é necessário que o profissional da informação inove, trazendo para a biblioteca novas formas de se relacionar com o usuário, modernize e incorpore alterações que atendam ao atual cenário de cultura virtual que se consolida cada vez mais em nossa sociedade, frutos das transformações provenientes da contemporaneidade.

Tecnologias na Educação: dos caminhos trilhados aos atuais desafios Technology in Education: the paths travelled to the current challenges

Directory of Open Access Journals (Sweden)

Maria Elizabeth Bianconcini de Almeida

2008-09-01

Full Text Available Este artigo apresenta um resgate da recente história das tecnologias de informação e comunicação na educa��ão a partir de uma retrospectiva dos caminhos trilhados em países cujas ações tiveram forte influência na trajetória brasileira, com destaque especial para Estados Unidos da América, França e Portugal. Em seguida, o tema é tratado no âmbito da realidade brasileira até o momento atual caracterizado pela proposta de inserir equipamentos móveis de pequeno porte e baixo custo (laptop educacional nas escolas. No final, destaca as principais convergências que se sobressaem na história das tecnologias na educação desses países e conclui que, apesar da disparidade quantitativa em relação à disponibilidade de recursos entre esses países, a concretização das ações se mostra aquém dos objetivos, metas, desejos e utopias, com desafios a superar, em especial no que se refere à formação de educadores, para a efetiva integração das TIC na escola e no currículo. Palavras-chave: Tecnologias de Informação e Comunicação. Tecnologias na Educação. Políticas Públicas. Integração de Tecnologias ao Currículo.This article presents a review of the recent history of information and communication technologies in education through a retrospective of the paths traveled in countries whose actions have had strong influence on the Brazilian trajectory, with special emphasis on the United States, France and Portugal. The subject is next addressed in the context of the Brazilian reality, characterized by the current proposal to introduce small, portable, low cost equipment (educational laptops in schools. Finally, the major convergences that stand out in the history of technology in education in these countries is highlighted. It is concluded that, despite the quantitative disparity between these countries with respect to the availability of resources, the implementation of actions has not achieved the objectives, goals

Pressure vessel rupture within a chamber: the pressure history on the chamber wall

International Nuclear Information System (INIS)

Baum, M.R.

1989-04-01

Generally there is a large number of pressure vessels containing high pressure gas on power stations and chemical plant. In many instances, particularly on power plant, these vessels are within the main building. If a pressure vessel were to fail, the surrounding structures would be exposed to blast loads and the forces resulting from jets of fluid issuing from the breached vessel. In the case where the vessel is in a relatively closed chamber there would also be a general overpressurisation of the chamber. At the design stage it is therefore essential to demonstrate that the plant could be safely shut down in the event of a pressure vessel failure, that is, it must be shown that the chamber will not collapse thus putting the building at risk or hazarding equipment essential for a safe shut down. Such an assessment requires the loads applied to the chamber walls, roof, etc. to be known. (author)

Wet drift chambers for precise luminosity

International Nuclear Information System (INIS)

Anderson, B.E.; Kennedy, B.W.; Ahmet, K.; Attree, D.J.; Barraclough, G.A.; Cresswell, M.J.; Hayes, D.A.; Miller, D.J.; Selby, C.; Sherwood, P.

1994-01-01

A set of high-precision compact drift chambers has been a vital component of the OPAL luminosity monitor since the start of data-taking at LEP. They were augmented in 1992 by the addition of Small Angle Reference Chambers with a very similar design to the original chamber. The performance of the chambers is reviewed, highlighting both the importance of using polyalkylene glycol (Breox) to maintain a uniform and parallel electric field and the construction techniques used to sustain the required field strength. We describe some of the operating problems, with their solutions, and show how the chambers have been used in achieving a systematic error of 0.41% on the luminosity measurement. ((orig.))

The Boycott effect in magma chambers

Science.gov (United States)

Blanchette, F.; Peacock, T.; Bush, J. W. M.

2004-03-01

We investigate the plausibility of the stratified Boycott effect as a source of layering in magma chambers. Crystal settling within the magma chamber will generate buoyant fluid near the sloping sidewalls whose vertical ascent may be limited by the ambient stratification associated with vertical gradients in SiO2. The resulting flow may be marked by a layered structure, each layer taking the form of a convection cell spanning the lateral extent of the magma chamber. Using parameters relevant to magma chambers, we estimate that such convection cells would be established over a timescale of a month and have a depth on the order of 4m, which is roughly consistent with field observations of strata within solidified chambers.

The KEK 1 m hydrogen bubble chamber

International Nuclear Information System (INIS)

Doi, Yoshikuni; Araoka, Osamu; Hayashi, Kohei; Hayashi, Yoshio; Hirabayashi, Hiromi.

1978-03-01

A medium size hydrogen bubble chamber has been constructed at the National Laboratory for High Energy Physics, KEK. The bubble chamber has been designed to be operated with a maximum rate of three times per half a second in every two second repetition time of the accelerator, by utilizing a hydraulic expansion system. The bubble chamber has a one meter diameter and a visible volume of about 280 l. A three-view stereo camera system is used for taking photographic pictures of the chamber. A 2 MW bubble chamber magnet is constructed. The main part of the bubble chamber vessel is supported by the magnet yoke. The magnet gives a maximum field of 18.4 kG at the centre of the fiducial volume of the chamber. The overall system of the KEK 1 m hydrogen bubble chamber facility is described in some detail. Some operational characteristics of the facility are also reported. (auth.)

Loss of ions in cavity ionization chambers

International Nuclear Information System (INIS)

Takata, N.; Tran, N.T.; Kim, E.; Marsoem, P.; Kurosawa, T.; Koyama, Y.

2005-01-01

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 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

Investigation of very long jet chambers

Energy Technology Data Exchange (ETDEWEB)

Burckhart, H J; Va' vra, J; Zankel, K; Dudziak, U; Schaile, D; Schaile, O; Igo-Kemenes, P; Lennert, P

1986-04-01

The electrostatic properties and the performances of very long jet chambers have been investigated. Using 100 MHz FADC wave form digitisers, the tracking accuracy, the charge division and the dE/dx performance of two chambers, one with 4.5 m long tungsten wires and one with 4 m long highly resistive ''NiCoTi'' wires have been studied. The geometry of the chambers was chosen to define some of the design parameters of the jet chamber for the OPAL detector for LEP.

IFE chamber technology testing program in NIF and chamber development test plan

International Nuclear Information System (INIS)

Abdou, M.A.

1995-01-01

Issues concerning chamber technology testing program in NIF involving: criteria for evaluation/prioritization of experiments, engineering scaling requirements for test article design and material selection and R and D plan prior to NIF testing were addressed in this paper. In order to maximize the benefits of testing program in NIF, the testing in NIF should provide the experimental data relevant to DEMO design choice or to DEMO design predictive capability by utilizing engineering scaling test article designs. Test plans were developed for 2 promising chamber design concepts. Early testing in non-fusion/non-ignition prior to testing in ignition facility serves a critical role in chamber R and D test plans in order to reduce the risks and costs of the more complex experiments in NIF

Materiais para as tecnologias da energia: desafios e o papel da reciclagem 

OpenAIRE

Nogueira, C. A.

2014-01-01

A indústria da energia, nomeadamente as tecnologias renováveis e de baixo carbono, necessita de matérias-primas, algumas raras e mesmo consideradas críticas, para produzir os materiais de que necessita para o seu desenvolvimento. Muitos desses materiais são escassos na Europa, colocando-a numa posição de grande dependência e fragilidade. A utilização dos resíduos como fontes secundárias dessas matérias-primas é uma das medidas essenciais para enfrentar este desafio. Neste artigo discute-se es...

Difusão de tecnologia e sexismo nas Ciências Agrárias

OpenAIRE

Fiúza,Ana Louise de Carvalho; Pinto,Neide Maria de Almeida; Galinari,Tiago Nogueira; Barros,Vanessa Aparecida Moreira de

2009-01-01

Este trabalho analisa a percepção predominante, no meio rural, de que a tecnologia é um produto relacionado ao universo masculino. Nesta pesquisa, são trazidos dados que evidenciam o grande distanciamento das mulheres rurais do acesso ao conhecimento tecnológico, produzido e difundido dentro da universidade, que está direcionado para a melhora da qualidade de vida e para as possibilidades de aumento na geração de renda no meio rural, mas ao qual elas ainda têm acesso insignificante. Trabalhou...

Impedances in lossy elliptical vacuum chambers

International Nuclear Information System (INIS)

Piwinski, A.

1994-04-01

The wake fields of a bunched beam caused by the resistivity of the chamber walls are investigated for a vacuum chamber with elliptical cross section. The longitudinal and transverse impedances are calculated for arbitrary energies and for an arbitrary position of the beam in the chamber. (orig.)

Ensino híbrido: personalização e tecnologia na educação.

Directory of Open Access Journals (Sweden)

Joilson Guimarães Almeida Júnior

2017-05-01

Full Text Available A obra “Ensino híbrido: personalização e tecnologia da educação” foi organizada por Lilian Bacich, Adolfo Tanzi Neto, Fernando de Mello Trevisani. É composta por 10 capítulos escritos por 13 autores. O livro é fruto das pesquisas do Grupo de Experimentações em Ensino Híbrido desenvolvido pelo Instituto Península e pela Fundação Lemann. Trata do uso da tecnologia na educação, como ponte entre o padrão atual e a estruturação de um novo currículo escolar inovador. Os autores utilizam a metodologia do relato de experiências, baseada na prática educacional, em que 16 professores do grupo, lecionando em instituições públicas e privadas do Brasil, desenvolveram oito meses de pesquisa. A temática da obra se faz, incialmente, com a importante análise sobre a educação híbrida e as formas como se tem abordado o tema no Brasil e fora dele. Em seguida, fez-se uma discussão sobre a prática da educação híbrida, com experiências vividas pelo Grupo de Experimentações.

JOVENS E ADULTOS EM PROCESSO DE ESCOLARIZAÇÃO E AS TECNOLOGIAS DIGITAIS. YOUTH AND ADULTS IN THE SCHOOLING PROCESS AND THE DIGITAL TECHNOLOGIES

Directory of Open Access Journals (Sweden)

Bianca Maria Santana de Brito

2013-11-01

Full Text Available As tecnologias digitais compõem um cenário de mudanças em diversas esferas da sociedade. O objetivo deste trabalho foi investigar a presença de tais tecnologias na EJA (educação de jovens e adultos, por meio dos usos que estudantes dizem fazer dessas tecnologias e as possíveis relações desses usos com o processo de escolarização e as aprendizagens que vivenciam. Foram aplicados trinta questionários a jovens e adultos matriculados em salas de EJA de escolas públicas da região da Freguesia do Ó e Brasilândia, na zona noroeste de São Paulo, Brasil, e foram realizadas entrevistas de profundidade com cinco dos sujeitos que responderam aos questionários. Os resultados indicam que a maior parte dos sujeitos utiliza as tecnologias digitais fora das escolas para se comunicarem, para se divertirem e aprenderem sobre temas relacionados a projetos pessoais e conteúdos culturais de seu interesse. Também é possível afirmar que a apropriação das tecnologias, explorando suas diversas possibilidades para a realização de projetos individuais ou coletivos, depende de saberes prévios aprendidos na escola. Sem estarem alfabetizados, por exemplo, a capacidade de navegação pela rede fica comprometida, e quanto mais escolarizados, mais os sujeitos da EJA se apropriam das tecnologias digitais. A partir das análises destes resultados são desenhadas recomendações de como os projetos de EJA, as escolas e as políticas públicas podem contribuir para a ampliação dos usos das tecnologias digitais, e para que estes usos auxiliem nos processos de aprendizagem ao longo da vida dos sujeitos da EJA. Digital technologies form a scenario of changes in many spheres of society. The objective of this study is to investigate the existence of such technologies in youth and adult education, through the uses of technologies that students report and the relationship between these uses and the schooling process they experience. Thirty questionnaires were

Investigation of very long jet chambers

Energy Technology Data Exchange (ETDEWEB)

Burckhart, H J; Va' vra, J; Zankel, K; Dudziak, U; Schaile, D; Schaile, O; Igo-Kemenes, P; Lennert, P

1986-04-01

The electrostatic properties and the performances of very long jet chambers have been investigated. Using 100 MHz FADC wave form digitisers, the tracking accuracy, the charge division and the dE/dx performance of two chambers, one with 4.5 m long tungsten wires and one with 4 m long highly resistive ''NiCoTi'' wires have been studied. The geometry of the chambers was chosen to define some of the design parameters of the jet chamber for the OPAL detector for LEP. (orig.).

Measurement of back-scattered radiation from micro multileaf collimator into the beam monitor chamber from a dual energy linear accelerator

Directory of Open Access Journals (Sweden)

Muralidhar K

2007-01-01

Full Text Available Measurements designed to find the collimator backscatter into the beam monitor chamber from Micro Multileaf collimator of 6 MV photon beams of the Siemens Primus linear accelerator were made with the help of dose rate feedback control. The photons and electrons backscattered from the upper and lower secondary collimator jaws give rise to a significant increase in the ion charge measured by monitor chamber. This increase varies between the different accelerators. The output measurements were carried out in air at the isocenter. The effect of collimator backscatter was investigated by measuring the pulse width, number of beam pulses per monitor unit, monitor unit rate and dose for different mMLC openings. These measurements were made with and without dose rate feedback control, i.e., with constant electron beam current in the accelerator. Monitor unit rate (MU/min was almost constant for all field sizes. The maximum variation between the open and the closed feedback control circuits was 2.5%. There was no difference in pulse width and negligible difference in pulse frequency. Maximum value of backscattered radiation from the micro Multileaf collimator into the beam monitor chamber was found to be 0.5%.

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.

A disseminação seletiva da informação e a tecnologia RSS nas bibliotecas de Tribunais em Brasília

Directory of Open Access Journals (Sweden)

Thiago Gomes Eirão

2015-09-01

Full Text Available A pesquisa teve como objetivo verificar a utilização do serviço de disseminação seletiva da informação (DSI e a tecnologia RSS em bibliotecas de Tribunais em Brasília. Esse estudo foi proposto para identificar como os serviços de referência de tais bibliotecas veem a validade do serviço de disseminação seletiva e mais especificamente a tecnologia RSS como instrumentos para o desenvolvimento de novos produtos e serviços de informação com o foco nas necessidades do usuário. Ao todo foram visitadas seis instituições do poder Judiciário que possuem sede em Brasília. A amostra dos respondentes foi composta por doze profissionais formados em Biblioteconomia, que atuavam no serviço de referência dos respectivos órgãos. A técnica de pesquisa utilizada foi a entrevista semiaberta. Para obtenção das respostas foi utilizado um roteiro de perguntas que permitia ao entrevistador aprofundar as questões a partir das respostas concedidas pelos entrevistados. Os resultados obtidos demonstraram que os profissionais ainda veem utilidade do serviço de DSI, apesar de apenas duas das bibliotecas visitadas o utilizarem. Também foi possível verificar que os profissionais vislumbram a utilização da tecnologia RSS nos serviços de referência, apesar de nenhuma biblioteca visitada já ter pensado na utilização da tecnologia e os sites dessas bibliotecas ainda possuírem uma baixa disponibilização de serviços e utilização.

Chamber propagation physics for heavy ion fusion

International Nuclear Information System (INIS)

Callahan, D.A.

1995-01-01

Chamber transport is an important area of study for heavy ion fusion. Final focus and chamber-transport are high leverage areas providing opportunities to significantly decrease the cost of electricity from a heavy ion fusion power plant. Chamber transport in two basic regimes is under consideration. In the low chamber density regime (approx-lt 0.003 torr), ballistic or nearly-ballistic transport is used. Partial beam neutralization has been studied to offset the effects of beam stripping. In the high chamber density regime (approx-gt.1 torr), two transport modes (pinched transport and channel transport) are under investigation. Both involve focusing the beam outside the chamber then transporting it at small radius (∼ 2 mm). Both high chamber density modes relax the constraints on the beam quality needed from the accelerator which will reduce the driver cost and the cost of electricity

Tecnologias do lar e pedagogias de gênero: representações da “dona de casa ideal” na revista Casa & Jardim (anos 1950 e 1960)

OpenAIRE

Padilha, Ana Caroline de Bassi

2014-01-01

Neste trabalho, temos como objetivo investigar as associações entre tecnologias domésticas e tipos de feminilidades na revista Casa & Jardim como mídia de pedagogias de gênero. O recorte de estudo tem como foco os discursos textuais e imagéticos sobre tecnologias do lar veiculados na revista Casa & Jardim durante as décadas de 1950 e 1960. Neste período, as revistas direcionadas para públicos femininos buscavam criar uma identificação das mulheres com o espaço e o consumo domésticos, apresent...

Multiwire proportional chamber and multistage avalanche chamber with low concentration photoionization gas

International Nuclear Information System (INIS)

Zhao Pingde; Xu Zhiqing; Tang Xiaowei

1986-01-01

The characteristics of multiwire proportional chamber and multistage avalanche chamber filled with argon and photoionization gas (C 2 H 5 ) 3 N were measured. The spatial resolution curves and output pulse height spectra were measured as well. Low concentration (C 2 H 5 ) 3 N can play an effective part in quenching. At very low concentration, the phenomena of avalanche transverse expansion was observed obviously

PEP quark search proportional chambers

Energy Technology Data Exchange (ETDEWEB)

Parker, S I; Harris, F; Karliner, I; Yount, D [Hawaii Univ., Honolulu (USA); Ely, R; Hamilton, R; Pun, T [California Univ., Berkeley (USA). Lawrence Berkeley Lab.; Guryn, W; Miller, D; Fries, R [Northwestern Univ., Evanston, IL (USA)

1981-04-01

Proportional chambers are used in the PEP Free Quark Search to identify and remove possible background sources such as particles traversing the edges of counters, to permit geometric corrections to the dE/dx and TOF information from the scintillator and Cerenkov counters, and to look for possible high cross section quarks. The present beam pipe has a thickness of 0.007 interaction lengths (lambdasub(i)) and is followed in both arms each with 45/sup 0/ <= theta <= 135/sup 0/, ..delta..phi=90/sup 0/ by 5 proportional chambers, each 0.0008 lambdasub(i) thick with 32 channels of pulse height readout, and by 3 thin scintillator planes, each 0.003 lambdasub(i) thick. Following this thin front end, each arm of the detector has 8 layers of scintillator (one with scintillating light pipes) interspersed with 4 proportional chambers and a layer of lucite Cerenkov counters. Both the calculated ion statistics and measurements using He-CH/sub 4/ gas in a test chamber indicate that the chamber efficiencies should be >98% for q=1/3. The Landau spread measured in the test was equal to that observed for normal q=1 traversals. One scintillator plane and thin chamber in each arm will have an extra set of ADC's with a wide gate bracketing the normal one so timing errors and tails of earlier pulses should not produce fake quarks.

Argus target chamber

International Nuclear Information System (INIS)

Rienecker, F. Jr.; Glaros, S.S.; Kobierecki, M.

1975-01-01

A target chamber for application in the laser fusion program must satisfy some very basic requirements. (1) Provide a vacuum on the order of 10 -6 torr. (2) Support a microscopically small target in a fixed point in space and verify its location within 5 micrometers. (3) Contain an adjustable beam focusing system capable of delivering a number of laser beams onto the target simultaneously, both in time and space. (4) Provide access for diagnostics to evaluate the results of target irradiation. (5) Have flexibility to allow changes in targets, focusing optics and number of beams. The ARGUS laser which is now under construction at LLL will have a target chamber which meets these requirements in a simple economic manner. The chamber and auxiliary equipment are described, with reference to two double beam focusing systems; namely, lenses and ellipsoidal mirrors. Provision is made for future operation with four beams, using ellipsoidal mirrors for two-sided illumination and lens systems for tetragonal and tetrahedral irradiation

Evaluation of the anterior chamber angle in pseudoexfoliation syndrome.

Science.gov (United States)

Iwanejko, Małgorzata; Turno-Kręcicka, Anna; Tomczyk-Socha, Martyna; Kaczorowski, Kamil; Grzybowski, Andrzej; Misiuk-Hojło, Marta

2017-08-01

Pseudoexfoliation syndrome (PEX) is the most frequently identifiable cause of secondary open-angle glaucoma, known as pseudoexfoliation glaucoma. The exact pathophysiology and etiology of PEX and associated glaucoma remains obscure. The purpose of this study was to determine the differences in the morphology of the anterior chamber angle in people with pseudoexfoliation syndrome and pseudoexfoliation glaucoma compared to a control group. We also evaluated the correlation between intraocular pressure (IOP) and pigmentation of the angle with the amount of exfoliated material in the anterior segment. The study group was composed of 155 eyes from 103 patients aged between 43 and 86 years. Each patient underwent a complete ophthalmological examination. Some difference was found in intraocular pressure between the PEX group and the control group and between the pseudoexfoliation glaucoma group and the control group, but no significant difference was found between the 2 study groups. There was a significant difference in the incidence of some degree of pigmentation in the anterior chamber angle and no difference in the widths of the angle between each group. A significant positive relationship was observed between intraocular pressure and the degree of pigmentation of the anterior chamber angle in both the PEX group and the pseudoexfoliation glaucoma group. The results of this study indicate that the amount of pigmentation and exfoliation material in the anterior segment significantly correlates with the level of IOP and possibly with the degree of trabecular dysfunction. It seems that for clear identification of PEX and pseudoexfoliation glaucoma factors, clinical assessment appears to be insufficient.

Single-chamber solid oxide fuel cell technology - From its origins to today's state of the art

Energy Technology Data Exchange (ETDEWEB)

Khun, M. [Department of Mechanical Engineering, Ecole Polytechnique de Montreal, Montreal, Quebec, H3T 1J4 (Canada); Napporn, T. W. [Equipe Electrocatalyse, Laboratoire de Catalyse en Chimie Organique, UMR CNRS 6503, Universite de Poitiers, Poitiers (France)

2010-07-01

In single-chamber solid oxide fuel cells (SC-SOFCs), both anode and cathode are situated in a common gas chamber and are exposed to a mixture of fuel and oxidant. The working principle is based on the difference in catalytic activity of the electrodes for the respective anodic and cathodic reactions. The resulting difference in oxygen partial pressure between the electrodes leads to the generation of an open circuit voltage. Progress in SC-SOFC technology has enabled the generation of power outputs comparable to those of conventional SOFCs. This paper provides a detailed review of the development of SC-SOFC technology. (author)

Cylindrical ionization chamber with compressed krypton

International Nuclear Information System (INIS)

Kuz'minov, V.V.; Novikov, V.M.; Pomanskii, A.A.; Pritychenko, B.V.; Viyar, J.; Garcia, E.; Morales, A.; Morales, J.; Nunes-Lagos, R.; Puimedon, J.; Saens, K.; Salinas, A.; Sarsa, M.

1993-01-01

A cylindrical ionization chamber with a grid is used to search for double positron decay and atomic electron conversion to a positron in 78 Kr. Krypton is the working gas material of the chamber. The spectrometric characteristics of the chamber filled with krypton and xenon are presented. The energy resolution is 2.1% for an energy of 1.84 MeV (the source of γ-quanta is 88 Y) when the chamber is filled with a mixture of Kr+0.2% H 2 under a pressure of 25 atm

Advances on fission chamber modelling

International Nuclear Information System (INIS)

Filliatre, Philippe; Jammes, Christian; Geslot, Benoit; Veenhof, Rob

2013-06-01

In-vessel, online neutron flux measurements are routinely performed in mock-up and material testing reactors by fission chambers. Those measurements have a wide range of applications, including characterization of experimental conditions, reactor monitoring and safety. Depending on the application, detectors may experience a wide range of constraints, of several magnitudes, in term of neutron flux, gamma-ray flux, temperature. Hence, designing a specific fission chamber and measuring chain for a given application is a demanding task. It can be achieved by a combination of experimental feedback and simulating tools, the latter being based on a comprehensive understanding of the underlying physics. A computation route that simulates fission chambers, named CHESTER, is presented. The retrieved quantities of interest are the neutron-induced charge spectrum, the electronic and ionic pulses, the mean current and variance, the power spectrum. It relies on the GARFIELD suite, originally developed for drift chambers, and makes use of the MAGBOLTZ code to assess the drift parameters of electrons within the filling gas, and the SRIM code to evaluate the stopping range of fission products. The effect of the gamma flux is also estimated. Computations made with several fission chambers exemplify the possibilities of the route. A good qualitative agreement is obtained when comparing the results with the experimental data available to date. In a near future, a comprehensive experimental programme will be undertaken to qualify the route using the known neutron sources, mock-up reactors and wide choice of fission chambers, with a stress on the predictiveness of the Campbelling mode. Depending on the results, a refinement of the modelling and an effort on the accuracy of input data are also to be considered. CHESTER will then make it possible to predict the overall sensitivity of a chamber, and to optimize the design for a given application. Another benefit will be to increase the

An electrodeless drift chamber

International Nuclear Information System (INIS)

Allison, J.; Barlow, R.J.; Bowdery, C.K.; Duerdoth, I.; Rowe, P.G.

1982-01-01

We describe a chamber in which the drift field is controlled by the deposition of electrostatic charge on an insulating surface. The chamber operates with good efficiency and precision for observed drift distances of up to 45 cm, promises to be extremely robust and adaptable and offers a very cheap way of making particle detectors. (orig.)

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.

Chamber propagation physics for heavy ion fusion

International Nuclear Information System (INIS)

Callahan, D.A.

1996-01-01

Chamber transport is a key area of study for heavy ion fusion. Final focus and chamber transport are high leverage areas providing opportunities to decrease significantly the cost of electricity from a heavy ion fusion power plant. Chamber transport in two basic regimes is under consideration. In the low chamber density regime (below about 0.003 Torr), ballistic or nearly ballistic transport is used. Partial beam neutralization has been studied to offset the effects of beam stripping. In the high chamber density regime (above about 0.1 Torr), two transport modes (pinched transport and channel transport) are under investigation. Both involve focusing the beam outside the chamber and then transporting it at small radius (about 2 mm). Both high chamber density modes relax the constraints on the beam quality needed from the accelerator which will reduce the driver cost and the cost of electricity. (orig.)

Drift velocity studies at a time projection chamber for various water contents in the gas mixture

International Nuclear Information System (INIS)

Stoever, F.W.

2007-03-01

For the answer of different open questions in high energy physics the construction of a linear e + e - collider with a c. m. energy of up to one TeV is prepared. With this is connected a comprehensive development on detectors, which must satisfy the requirements of the planned experiments. For the track chamber a TPC is considered. Hereby it deals with a gas-based concept, which has already been proved in past experiments and which is at time further developed by means of test chambers. The composition of the gas mixtureplays hereby an important role. Impurities of the gas mixture, especially by oxygen and water from the ambient air are a fact, which occurs every time in the development phase and can scarcely be avoided. From this arose the motivation to study directly the effects of this impurities. The object of the present thesis are correlations between drift velocity and water content in the chamber gas of a TPC

How to build a cloud chamber?

International Nuclear Information System (INIS)

Mariaud, C.

2012-01-01

The cloud chamber had its heyday in the first half of last century and allowed the discovery of new particles such as the anti-electron, the muon and the neutral and the charged kaon. The bubble chamber replaced it in the mid fifties. This article recalls the principle of the cloud chamber and shows, in a detailed way, how to proceed to build one with on-the-shelf materials. This design is based on the use of isopropanol whose liquefaction through the form of droplets materializes the track of the particle and on the use of combined Peltier cells (instead of CO 2 snow) to cool the chamber. This cloud chamber has been successfully used in schools to observe particles mainly electrons, alphas and muons generated by cosmic rays. (A.C.)

[Pigment dispersion syndrome and pigmentary glaucoma. Morphometric analysis of the anterior chamber segment with SL-OCT].

Science.gov (United States)

Birner, B; Tourtas, T; Wessel, J M; Jünemann, A G; Mardin, C Y; Kruse, F E; Laemmer, R

2014-01-01

The purpose of this study was to analyze if anterior chamber parameters are risk factors for the development of pigment dispersion syndrome (PDS) and/or for the conversion to pigmentary glaucoma (PG). This study included a total of 63 eyes from 35 patients with PDS and PG and 65 eyes from 49 unaffected volunteers as the control group. The following parameters were measured by slit lamp optical coherence tomography (SL-OCT): anterior chamber volume (ACV) and depth (ACD), angle opening distance (AOD) and the trabecular iris space area (TISA) at 500 µm and 750 μm from the scleral spur. Comparisons between the following groups were performed: between the PDS/PG and the control group, between PDS and PG and between male and female patients. The results of ACV, ACD, AOD and TISA were significantly higher in PDS/PG patients when compared to the control group. There were no significant differences between PDS and PG. The gender-specific comparison also showed no significant differences. Significantly higher anterior chamber parameters are a possible risk factor for development of PDS; however, a higher risk of conversion to PG does not seem to correlate with increased anterior chamber parameters. The parameters of the anterior chamber are apparently not associated with the male predominance of PDS and PG.

Evaluating the variation of response of ionizing chamber type pencil for different collimators

International Nuclear Information System (INIS)

Andrade, Lucio das Chagas de; Peixoto, Jose Guilherme Pereira

2014-01-01

The pencil ionization chamber is used in dosimetric procedures for X-ray beams in the energy range of a scanner. Calibration of such camera is still being extensively studied because the procedure is different from the others. To study the variation of response of the camera for different collimators was analyzed three different collimators. It was found that among the other showed the best response was the opening of 30 mm. (author)

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...

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

Quality control of ATLAS muon chambers

CERN Document Server

Fabich, Adrian

ATLAS is a general-purpose experiment for the future Large Hadron Collider (LHC) at CERN. Its Muon Spectrometer will require ∼ 5500m2 of precision tracking chambers to measure the muon tracks along a spectrometer arm of 5m to 15m length, embedded in a magnetic field of ∼ 0.5T. The precision tracking devices in the Muon System will be high pressure drift tubes (MDTs). Approximately 370,000 MDTs will be assembled into ∼ 1200 drift chambers. The performance of the MDT chambers is very much dependent on the mechanical quality of the chambers. The uniformity and stability of the performance can only be assured providing very high quality control during production. Gas tightness, high-voltage behaviour and dark currents are global parameters which are common to gas detectors. For all chambers, they will be tested immediately after the chamber assembly at every production site. Functional tests, for example radioactive source scans and cosmic-ray runs, will be performed in order to establish detailed performan...

Hyperbaric and hypobaric chamber fires: a 73-year analysis.

Science.gov (United States)

Sheffield, P J; Desautels, D A

1997-09-01

Fire can be catastrophic in the confined space of a hyperbaric chamber. From 1923 to 1996, 77 human fatalities occurred in 35 hyperbaric chamber fires, three human fatalities in a pressurized Apollo Command Module, and two human fatalities in three hypobaric chamber fires reported in Asia, Europe, and North America. Two fires occurred in diving bells, eight occurred in recompression (or decompression) chambers, and 25 occurred in clinical hyperbaric chambers. No fire fatalities were reported in the clinical hyperbaric chambers of North America. Chamber fires before 1980 were principally caused by electrical ignition. Since 1980, chamber fires have been primarily caused by prohibited sources of ignition that an occupant carried inside the chamber. Each fatal chamber fire has occurred in an enriched oxygen atmosphere (> 28% oxygen) and in the presence of abundant burnable material. Chambers pressurized with air (Hyperbaric Medical Society's Chamber Experience and Mishap Database. This epidemiologic review focuses on information learned from critical analyses of chamber fires and how it can be applied to safe operation of hypobaric and hyperbaric chambers.

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...

Micro plate fission chamber development

International Nuclear Information System (INIS)

Wang Mei; Wen Zhongwei; Lin Jufang; Jiang Li; Liu Rong; Wang Dalun

2014-01-01

To conduct the measurement of neutron flux and the fission rate distribution at several position in assemblies, the micro plate fission chamber was designed and fabricated. Since the requirement of smaller volume and less structure material was taken into consideration, it is convinient, commercial and practical to use fission chamber to measure neutron flux in specific condition. In this paper, the structure of fission chamber and process of fabrication were introduced and performance test result was presented. The detection efficiency is 91.7%. (authors)

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.

High resolution drift chambers

International Nuclear Information System (INIS)

Va'vra, J.

1985-07-01

High precision drift chambers capable of achieving less than or equal to 50 μm resolutions are discussed. In particular, we compare so called cool and hot gases, various charge collection geometries, several timing techniques and we also discuss some systematic problems. We also present what we would consider an ''ultimate'' design of the vertex chamber. 50 refs., 36 figs., 6 tabs

The Mark II Vertex Drift Chamber

International Nuclear Information System (INIS)

Alexander, J.P.; Baggs, R.; Fujino, D.

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 μm spatial resolution and 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 2 mixtures are presented. 10 refs., 12 figs., 1 tab

Bicone vacuum chamber for ISR intersection

CERN Multimedia

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.

Study on an In-Situ Open-Top Fumigation Chamber System for Ozone Exposure in Field%田间原位开顶式臭氧熏蒸系统研究

Institute of Scientific and Technical Information of China (English)

耿春梅; 杨文; 殷宝辉; 王宗爽; 刘红杰; 王效科; 王玮

2011-01-01

臭氧污染造成的粮食作物减产及经济损失受到普遍关注,研究植被对臭氧的响应是评估臭氧污染造成影响的重要依据.针对国内外已有开顶式熏蒸系统的缺点,改进布气管的布气孔大小和形状,以保证气室内布气的均匀性;改进风机的供气方式,采用一供三的方式以提高各平行样间的平行性;通过计算机负反馈控制和采用引流装置,以提高臭氧浓度控制和测定的准确性.在国内率先尝试在跟随环境臭氧浓度的基础上增加一定浓度的臭氧作为熏蒸气体.田间实测表明:该装置气室内臭氧浓度与设定浓度一致且分布均匀,平行样的平行性好,气室内外温度、相对湿度及光照强度衰减均达到了国内外同类装置水平,可广泛用于田间原位大气污染物对植被影响的研究.%Ozone pollution, which results in lower production and economic loss of food crops, has caused widespread concern in recent years. The study of the dose-response relationship between ozone and vegetation is an important basis for assessing the impact of ozone pollution on vegetation. In view of the shortcomings of existing instruments, this study developed an open-top chamber system. Features include: redesigning the size and shape of the holes on the gas distribution tube to ensure uniform gas distribution in the chamber; using one blower to supply gases for three chambers to ensure the same conditions in parallel chambers; and, the use of computer feedback control and a drainage device to ensure the accuracy of the ozone measurement and control. The first attempt in this study was to increase the ambient concentration of ozone as the fumigation gas to certain levels.The results from field studies showed that the ozone concentrations inside the chamber were consistent with the setting values, gases were uniformly distributed, and good consistency among the results from the three parallel chambers was found. The differences

O uso da tecnologia digital em turismo e em hospitalidade no relacionamento com consumidores

OpenAIRE

Funcia, Thais da Silva

2010-01-01

O objetivo geral do trabalho é estudar as formas de utilização da tecnologia digital no relacionamento com consumidores pelas empresas de turismo e de hospitalidade. Especificamente, objetiva caracterizar os recursos tecnológicos digitais utilizados pelas empresas no relacionamento com os clientes, com ênfase particular sobre a web 2.0, o e-commerce e a telefonia móvel. O trabalho apresenta um referencial teórico composto por autores nas áreas de turismo e de hospitalidade, marketing de servi...

Identidade e tecnologia social: um estudo junto às artesãs da Vila Rural Esperança

Directory of Open Access Journals (Sweden)

Maíra Coelho Bonilha

Full Text Available Tanto o mundo quanto as pessoas estão num contínuo processo de transformação, construção e constituição, no qual o sujeito e o ambiente afetam-se mutuamente por meio das múltiplas relações estabelecidas. Sendo assim, o objetivo no presente artigo foi o de compreender de que forma a tecnologia social contribuiu para o processo de construção e constituição da identidade das artesãs da comunidade da Vila Rural Esperança, a partir do momento em que tal tecnologia transformadora (social e humana inseriu-se em seu ambiente e foi incorporada no decorrer do projeto Seda Justa. Além de tratar-se de tema atual, como a tecnologia social e a identidade, suscita um diálogo interdisciplinar. Sabe-se que todo e qualquer tipo de transformação e forma de empreendimento/organização imprime marcas significativas nas relações profissionais e pessoais, acerca do trabalho, o que merece estudos aprofundados. A identidade sempre é afetada pelas significações culturais e varia de acordo com as situações vivenciadas e a história de vida dos sujeitos. Em virtude disso, escolheu-se o método da história de vida para a coleta dos dados, e a hermenêutica como base de interpretação. Dessa forma, a pesquisa permitiu, por meio dos relatos e das memórias das participantes da pesquisa, a exteriorização de suas experiências e sentimentos: o que valorizam, pensam, sentem e fazem, revelando, assim, o processo de construção de suas identidades e seus elementos constituintes.

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......, and disassembly and cleaning of the system. In addition, embedding and fluorescent in situ hybridization of flow chamber-grown biofilms are addressed....

Microstrip gas chamber on thin-film Pestov glass and micro gap chamber

International Nuclear Information System (INIS)

Gong, W.G.; Harris, J.W.; Wieman, H.

1994-07-01

The authors report developments of the Microstrip Gas Chamber on thin-film Pestov glass and the Micro Gap Chamber. By coating a thin-layer of low-resistive, electronically-conductive glass on various substrates (including quartz and ceramics), they built MSGCs of high gain stability and low leakage current. They were tested in Ar-CH 4 (10%) and He-C 2 H 6 (50%) gas mixtures. Energy resolutions of 17-20% were measured for 6keV x-rays. This design can make the choice of substrate less important, save the cost of ion-implantation, and use less glass material. Micro Gap Chamber was successfully tested in He-C 2 H 6 (50%) and Ar-C 2 H 6 (50%) gas mixtures. Energy resolutions of about 20% were obtained. Both detectors are expected to have high rate capability

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...

Comparison among different CT ionization chambers

International Nuclear Information System (INIS)

Castro, Maysa C. de; Xavier, Marcos; Caldas, Linda V.E.

2015-01-01

The dosimetry in computed tomography (CT) is carried out by the use of a pencil type ionization-chamber, because it has a uniform response at all angles relative to the incident beam of radiation, which is essential for CT equipment since the X-ray tube executes a circular movement around the table during irradiation. The commercial ionization chamber used to perform quality control procedures of this kind of equipment has a length of the sensitive volume of 10 cm. In the Calibration Laboratory of Instruments (LCI) of the IPEN there were already developed some prototypes with small differences in construction, when compared to commercially available ionization chambers. They have been used in previous studies and showed results within internationally acceptable limits. The ionization chambers tested in this study present the sensitive volume lengths of 1 cm, 3 cm and 10 cm. The objective of this study was to present results on the stability test of the three homemade ionization chambers and a commercial chamber, as well to obtain the calibration coefficients for each of them in CT standard X radiation beams. The obtained results for both characterization tests are within the recommended limits, except for the homemade ionization chambers with sensitive volume lengths of 3 cm and 1 cm in the case of the stability test. (author)

As tecnologias de informação e comunicação na prática pedagógica e gestão escolar

Directory of Open Access Journals (Sweden)

Ikeshoji, Elisangela Aparecida Bulla

2015-06-01

Full Text Available O presente artigo apresenta como principal finalidade discutir algumas das especificidades quanto ao uso das Tecnologias de Informação e Comunicação (TIC no cotidiano escolar, especialmente, nas práticas pedagógicas e exercício da gestão, enfatizando a necessidade de formação dos gestores escolares para o uso efetivo desses recursos, de forma contextualizada, significativa e crítica. Para o desenvolvimento deste trabalho, optou-se como procedimento metodológico a realização de uma revisão bibliográfica sistemática nas bases de dados Scielo. A escolha por este tipo de pesquisa se deu em função de possibilitar ao pesquisador ter contato com os conhecimentos já produzidos na área de “Tecnologias e Gestão Escolar”, bem como a identificação de suas ideias principais. Realizou-se o levantamento de publicações científicas, produzidas no Brasil, entre 2004 a 2014, que discutem o uso das tecnologias de informação e comunicação na escola, especialmente, articuladas à gestão escolar. Os descritores utilizados foram os seguintes: “Tecnologias na Escola” e “Gestão Escolar”. Como principais resultados obtidos a partir deste estudo, destaca-se a importância do desenvolvimento de processos de formação em serviço que favoreçam aos gestores escolares e respectivas equipes momentos de reflexões em pares e a percepção da necessidade da construção de uma cultura colaborativa e digital no âmbito escolar.

Controle Externo da governança de Tecnologia da Informação

OpenAIRE

Raimir Holanda Filho; José Auriço Oliveira

2012-01-01

O crescente processo de informatização da Administração Pública brasileira contribui para uma maior agilidade e qualidade nos serviços públicos prestados para a sociedade e um consequente aumento na transparência das ações governamentais. Por outro lado, os gastos nos investimentos e na manutenção dos recursos de Tecnologia da Informação (TI) vêm aumentando consideravelmente, bem como tem-se verificado uma forte dependência das instituições com relação aos sistemas informatizados e à seguranç...

Multi-stage low-pressure avalanche chamber

International Nuclear Information System (INIS)

Zanevskij, Yu.V.; Peshekhonov, V.D.; Smykov, L.P.

1985-01-01

A multi-stage avalanche-chamber filled with isobutane operating at the pressure of 6 torr is described. The chamber comprises an amplifying gap, drift gap and multiwire proportional chamber with interelectrode gaps equal to 4 mm. The anode plane of the proportional chamber is winded of wire 2 μm in diameter with 2 mm pitch. The cathode are winded orthogonally to anode wires of wire 50 μm in diameter with 1 mm pitch. Drift and preamplifier gaps are formed by grid electrodes made of wire 50 μm in diameter with dimension of the cell equal to 1x1 mm. Width of the drift gap is 5 mm, width of the preamplification gap is 3 or 9 mm. Coordinate data are removed from the cathodes of the proportional chamber by means of delay lines. Sensitive square of the chamber equals 240x180 mm. Gas gain coefficient is 3x10 6 at its square nonuniformity equal to approximately 3%. Spatial resolution by both coordinates equals 170 μm; spatial resolution for isotropic α-emitters located close to the preamplifier gap is equal to 500 μm

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...

Simulation of pulverized coal fired boiler: reaction chamber

Energy Technology Data Exchange (ETDEWEB)

Rodrigues, C.P.; Lansarin, M.A.; Secchi, A.R.; Mendes, T.F. [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil). Dept. de Engenharia Quimica. Grupo de Modelagem, Simulacao, Controle e Otimizacao de Processos)]. E-mail: {cperdomo, marla, arge, talita}@enq.ufrgs.br

2005-06-15

This work is part of a joint project to built a computational tool for power plant simulation, dealing specifically with the reaction chamber (place of the boiler where the fuel is burned). In order to describe the conversion of chemical energy to thermal energy, an one dimensional pseudo-homogeneous mathematical model, with variable physical properties, and based on mass and energy balances, was developed. The equations were implemented in the gPROMS simulator and the model parameters were estimated using the module gEST of this software, with experimental data from a large-scale coal-fired utility boiler and kinetic data from the open literature. The results showed that the model predicts the composition of the outlet combustion gas satisfactorily. (author)

Industrial development of neutron detectors, fission chambers, self powered detectors, ionization chambers

International Nuclear Information System (INIS)

Constans, H.; Coville, P.; Guerre, J.

1975-01-01

Reactor control requires the determination of neutron flux at all times. The needed characteristics lead to use of several types of detectors: boron lined counters, boron lined ionization chambers, fission ionization chambers and self powered detectors. The principle of the reaction involved the fabrication requirements, the different modes of utilization and the characteristics obtained are examined for each detector. The problem of electric connections in the active area has been solved by developing ''integrated cables'' [fr

Nest enlargement in leaf-cutting ants: relocated brood and fungus trigger the excavation of new chambers.

Directory of Open Access Journals (Sweden)

Daniela Römer

Full Text Available During colony growth, leaf-cutting ants enlarge their nests by excavating tunnels and chambers housing their fungus gardens and brood. Workers are expected to excavate new nest chambers at locations across the soil profile that offer suitable environmental conditions for brood and fungus rearing. It is an open question whether new chambers are excavated in advance, or will emerge around brood or fungus initially relocated to a suitable site in a previously-excavated tunnel. In the laboratory, we investigated the mechanisms underlying the excavation of new nest chambers in the leaf-cutting ant Acromyrmex lundi. Specifically, we asked whether workers relocate brood and fungus to suitable nest locations, and to what extent the relocated items trigger the excavation of a nest chamber and influence its shape. When brood and fungus were exposed to unfavorable environmental conditions, either low temperatures or low humidity, both were relocated, but ants clearly preferred to relocate the brood first. Workers relocated fungus to places containing brood, demonstrating that subsequent fungus relocation spatially follows the brood deposition. In addition, more ants aggregated at sites containing brood. When presented with a choice between two otherwise identical digging sites, but one containing brood, ants' excavation activity was higher at this site, and the shape of the excavated cavity was more rounded and chamber-like. The presence of fungus also led to the excavation of rounder shapes, with higher excavation activity at the site that also contained brood. We argue that during colony growth, workers preferentially relocate brood to suitable locations along a tunnel, and that relocated brood spatially guides fungus relocation and leads to increased digging activity around them. We suggest that nest chambers are not excavated in advance, but emerge through a self-organized process resulting from the aggregation of workers and their density

The little holographic bubble chambers

International Nuclear Information System (INIS)

Herve, A.

1983-01-01

The lifetime study of the charmed particles has readvanced the idea to use holography for the little fast-cycle bubble chambers. A pilot experiment has been realised in 1982 with a little bubble chamber filled up with freon-115. 40000 holograms have been recorded [fr

Pelletron general purpose scattering chamber

International Nuclear Information System (INIS)

Chatterjee, A.; Kailas, S.; Kerekette, S.S.; Navin, A.; Kumar, Suresh

1993-01-01

A medium sized stainless steel scattering chamber has been constructed for nuclear scattering and reaction experiments at the 14UD pelletron accelerator facility. It has been so designed that several types of detectors, varying from small sized silicon surface barrier detectors to medium sized gas detectors and NaI detectors can be conveniently positioned inside the chamber for detection of charged particles. The chamber has been planned to perform the following types of experiments : angular distributions of elastically scattered particles, fission fragments and other charged particles, angular correlations for charged particles e.g. protons, alphas and fission fragments. (author). 2 figs

Casais de mesmo sexo e parentalidade: um olhar sobre o uso das tecnologias reprodutivas

OpenAIRE

Vitule, Camila; Couto, Marcia Thereza; Machin, Rosana

2015-01-01

O artigo discute as concepções dos casais de mesmo sexo sobre o uso de Tecnologias Reprodutivas (TR) na efetivação do projeto de parentalidade. O estudo, de natureza qualitativa, baseou-se em entrevistas semiestruturadas, realizadas em 2011 e 2012 com 26 entrevistados residentes da Grande São Paulo/Brasil (12 casais, um homem e uma mulher). É apontado que os laços biológicos são preponderantes nos discursos das mulheres, havendo tendência destas a quererem utilizar as TR, sobretudo a ROPA (Re...

Radon diffusion chamber

International Nuclear Information System (INIS)

Pretzsch, G.; Boerner, E.; Lehmann, R.; Sarenio, O.

1986-01-01

The invention relates to the detection of radioactive gases emitting alpha particles like radon, thoron and their alpha-decaying daughters by means of a diffusion chamber with a passive detector, preferably with a solid state track detector. In the chamber above and towards the detector there is a single metallized electret with negative polarity. The distance between electret and detector corresponds to the range of the alpha particles of radon daughters in air at the most. The electret collects the positively charged daughters and functions as surface source. The electret increases the sensitivity by the factor 4

Uso de tecnologias digitais para o Ensino a Distância da compreensão e produção oral em língua inglesa por computador/WEB

Directory of Open Access Journals (Sweden)

Samuel de Carvalho Lima

2013-08-01

Full Text Available Considerando o recente panorama de pesquisas que refletem a relação e o compromisso da Linguística Aplicada (LA com os fenômenos que envolvem o uso das relativamente novas Tecnologias de Informação e Comunicação (TIC, este trabalho propõe investigar propostas de atividades on-line para a oferta de ensino da compreensão e produção oral em língua inglesa como língua estrangeira mediado por computador/web, tendo em vista o uso das tecnologias digitais que medeiam a realização do ensino. O tratamento dos dados suscitou a elaboração do catálogo de uso e frequência das tecnologias em que os exemplares das propostas de atividades on-line se encontravam ancorados, o que expressa a forma como os educadores integram os recursos digitais em suas práticas pedagógicas.

Os cursos superiores de tecnologia no contexto de expansão da educação superior no Brasil: a retomada da ênfase na educação profissional

Directory of Open Access Journals (Sweden)

Juliana Favretto

2013-06-01

Full Text Available O artigo analisa a expansão e o comportamento da oferta dos cursos superiores de tecnologia no âmbito da educação superior brasileira. Resgata a origem da educação profissional, das legislações e ações públicas que constituíram o processo de desenvolvimento da educação superior tecnológica no Brasil. Apresenta evidências da estrutura da oferta de cursos superiores de tecnologia, em nível de categoria acadêmica, administrativa e distribuição regional, no período de 2000 a 2010, um recorte de dados secundários extraídos do banco de dados do Inep/MEC. Os dados revelam que houve uma expansão substancial dos cursos superiores de tecnologia no período analisado, quando comparados aos demais cursos de graduação, com maior ênfase no setor privado e no âmbito acadêmico das universidades.

Lean premixed reacting flows with swirl and wall-separation zones in a contracting chamber

Science.gov (United States)

Zhang, Yuxin; Rusak, Zvi; Wang, Shixiao

2017-11-01

Low Mach number lean premixed reacting swirling flows with wall-separation zones in a contracting circular finite-length open chamber are studied. Assuming a complete reaction with high activation energy and chemical equilibrium behind the reaction zone, a nonlinear partial differential equation is derived for the solution of the flow stream function behind the reaction zone in terms of the inlet total enthalpy for a reacting flow, specific entropy and the circulation functions. Bifurcation diagrams of steady flows are described as the inlet swirl level is increased at fixed chamber contraction and reaction heat release. The approach is applied to an inlet solid-body rotation flow with constant profiles of the axial velocity, temperature and mixture reactant mass fraction. The computed results provide predictions of the critical inlet swirl levels for the first appearance of wall-separation states and for the size of the separation zone as a function of the inlet swirl ratio, Mach number, chamber contraction and heat release of the reaction. The methodology developed in this paper provides a theoretical feasibility for the development of the technology of swirl-assisted combustion where the reaction zone is supported and stabilized by a wall-separation zone.

Multispecimen dual-beam irradiation damage chamber

International Nuclear Information System (INIS)

Packan, N.H.; Buhl, R.A.

1980-06-01

An irradiation damage chamber that can be used to rapidly simulate fast neutron damage in fission or fusion materials has been designed and constructed. The chamber operates in conjunction with dual Van de Graaff accelerators at ORNL to simulate a wide range of irradiation conditions, including pulsed irradiation. Up to six experiments, each with up to nine 3-mm disk specimens, can be loaded into the ultrahigh vacuum chamber. Specimen holders are heated with individual electron guns, and the temperature of each specimen can be monitored during bombardment by an infrared pyrometer. Three different dose levels may be obtained during any single bombardment, and the heavy-ion flux on each of the nine specimens can be measured independently with only a brief interruption of the beam. The chamber has been in service for nearly three years, during which time approximately 250 bombardments have been successfully carried out. An appendix contains detailed procedures for operating the chamber

Bi-cone vacuum chamber in the ISR

CERN Multimedia

CERN PhotoLab

1976-01-01

The "bi-cone" vacuum chamber in ISR intersection I-7, for experiment R702. Made from 0.28 mm thick titanium, it was at its time the most transparent chamber ever built. Ian Wilson is standing next to the chamber. See also 7609219.

Device for gamma-chamber transducer alignment

International Nuclear Information System (INIS)

Mirkhodzhaev, A.Kh.; Kuznetsov, N.K.; Ostryj, Yu.E.

1987-01-01

The device consists of the upper part of the gamma chamber pilar to which a rod is rigidly fastened with a disk of acrylic plastic moving freely on the opposite end. The disk is placed coaxially and is equal to the gamma chamber detector crystal. The device makes it possible to use ordinary medical couches covered with a porolone mattress when the gamma chamber detector is placed below

Bubble chamber: Omega production and decay

CERN Document Server

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.

Venturi vacuum systems for hypobaric chamber operations.

Science.gov (United States)

Robinson, R; Swaby, G; Sutton, T; Fife, C; Powell, M; Butler, B D

1997-11-01

Physiological studies of the effects of high altitude on man often require the use of a hypobaric chamber to simulate the reduced ambient pressures. Typical "altitude" chambers in use today require complex mechanical vacuum systems to evacuate the chamber air, either directly or via reservoir system. Use of these pumps adds to the cost of both chamber procurement and maintenance, and service of these pumps requires trained support personnel and regular upkeep. In this report we describe use of venturi vacuum pumps to perform the function of mechanical vacuum pumps for human and experimental altitude chamber operations. Advantages of the venturi pumps include their relatively low procurement cost, small size and light weight, ease of installation and plumbing, lack of moving parts, and independence from electrical power sources, fossil fuels and lubricants. Conversion of three hyperbaric chambers to combined hyper/hypobaric use is described.

Explorando a Relação entre Autoeficácia e Atitude Positiva face à Introdução de uma Nova Tecnologia

Directory of Open Access Journals (Sweden)

Miguel Mauricio Isoni Filho

2014-11-01

Full Text Available O surgimento de novas tecnologias da informação e comunicação, como os sistemas integrados de gestão, tem influenciado não só o mundo empresarial, mas também as universidades.  Com base nisso, destaca-se que compreender os fatores que influenciam a decisão de um indivíduo em usar uma nova tecnologia vem se tornando um desafio na área de tecnologia da informação.  Em survey com 174 discentes de uma universidade federal brasileira, esta pesquisa desenvolve uma escala para associar autoeficácia e atitude positiva face à introdução do módulo de atividades acadêmicas de um sistema integrado de gestão. Entre os resultados, apresenta-se a estrutura fatorial dos construtos e discute-se a associação entre eles. As contribuições desta pesquisa são de natureza conceitual (aspectos cognitivos e atitudinais da interação pessoa-computador e metodológica (mensuração de escala. Como contribuição gerencial, a universidade poderá elaborar programas voltados a promover eficiência no uso do SIGAA com maior possibilidade de adoção por parte de seus discentes.

Apparatus for reading and recharging condenser ionization chambers

International Nuclear Information System (INIS)

McCall, R.C.

1977-01-01

A metering circuit for a condenser ionization chamber is disclosed for simultaneously recharging the ionization chamber and reading out the amount of charge required to recharge the chamber. During the recharging process, the amount of charge necessary to recharge the ionization chamber capacitor is placed on an integrating capacitor in the metering apparatus. The resultant voltage across the integrating capacitor is a measure of the radiation to which the ionization chamber was exposed. 9 claims, 1 figure

Liquid-filled ionization chamber temperature dependence

Energy Technology Data Exchange (ETDEWEB)

Franco, L. [Dpto. de Fisica de Particulas, Facultade de Fisica, Universidade de Santiago, Campus Sur S/N, 15782 Santiago de Compostela (Spain)]. E-mail: luciaff@usc.es; Gomez, F. [Dpto. de Fisica de Particulas, Facultade de Fisica, Universidade de Santiago, Campus Sur S/N, 15782 Santiago de Compostela (Spain); Iglesias, A. [Dpto. de Fisica de Particulas, Facultade de Fisica, Universidade de Santiago, Campus Sur S/N, 15782 Santiago de Compostela (Spain); Pardo, J. [Dpto. de Fisica de Particulas, Facultade de Fisica, Universidade de Santiago, Campus Sur S/N, 15782 Santiago de Compostela (Spain); Pazos, A. [Dpto. de Fisica de Particulas, Facultade de Fisica, Universidade de Santiago, Campus Sur S/N, 15782 Santiago de Compostela (Spain); Pena, J. [Dpto. de Fisica de Particulas, Facultade de Fisica, Universidade de Santiago, Campus Sur S/N, 15782 Santiago de Compostela (Spain); Zapata, M. [Dpto. de Fisica de Particulas, Facultade de Fisica, Universidade de Santiago, Campus Sur S/N, 15782 Santiago de Compostela (Spain)

2006-05-10

Temperature and pressure corrections of the read-out signal of ionization chambers have a crucial importance in order to perform high-precision absolute dose measurements. In the present work the temperature and pressure dependences of a sealed liquid isooctane filled ionization chamber (previously developed by the authors) for radiotherapy applications have been studied. We have analyzed the thermal response of the liquid ionization chamber in a {approx}20 deg. C interval around room temperature. The temperature dependence of the signal can be considered linear, with a slope that depends on the chamber collection electric field. For example, a relative signal slope of 0.27x10{sup -2}K{sup -1} for an operation electric field of 1.67x10{sup 6}Vm{sup -1} has been measured in our detector. On the other hand, ambient pressure dependence has been found negligible, as expected for liquid-filled chambers. The thermal dependence of the liquid ionization chamber signal can be parametrized within the Onsager theory on initial recombination. Considering that changes with temperature of the detector response are due to variations in the free ion yield, a parametrization of this dependence has been obtained. There is a good agreement between the experimental data and the theoretical model from the Onsager framework.

Scattering chamber for the Holifield Heavy Ion Research Facility

International Nuclear Information System (INIS)

Goodman, C.D.; Corum, J.E.

1977-09-01

A conceptual design is presented for a 62-in.-diam. general purpose scattering chamber to be used for nuclear research with heavy ions. The detector rotation mechanism is based on large diameter (approx. 58 in.) peripherally driven rings. This leaves the central region open for detectors and other apparatus and permits the use of a perpendicular ring for rotating a detector out of the reaction plane. A precision target slide with provisions for removing the entire slide under vacuum is part of the design. Access and viewing ports on the dished top and in the reaction plane will be provided. Cryogenic pumping will be used to keep the vacuum free from hydrocarbon vapors, water vapor, and oxygen

Numerical modeling and investigation of two-phase reactive flow in a high-low pressure chambers system

International Nuclear Information System (INIS)

Cheng, Cheng; Zhang, Xiaobing

2016-01-01

Highlights: • A novel two-dimensional two-phase flow model is established for the high-low pressure chambers system. • A strong packing of particles is observed at the projectile base and will cause the pressure to rise faster. • Different length–diameter ratios can affect the flow behavior through the vent-holes obviously. • The muzzle velocity decreases with the length–diameter ratio of the high-pressure chamber. - Abstract: A high-low pressure chambers system is proposed to meet the demands of low launch acceleration for informative equipment in many special fields such as Aeronautics, Astronautics and Weaponry. A two-dimensional two-phase flow numerical model is established to describe the complex physical process based on a modified two-fluid theory, which takes into account gas production, interphase drag, intergranular stress, and heat transfer between two phases. In order to reduce the computational cost, the parameters in the high-pressure chamber at the instant the vent-holes open are calculated by the zero-dimensional model as the initial conditions for the two-phase flow simulation in the high-low pressure chambers system. The simulation results reveal good agreement with the experiments and the launch acceleration of a projectile can be improved by this system. The propellant particles can be tracked clearly in both chambers and a strong packing of particles at the base of projectile will cause the pressure to rise faster than at other areas both in the axis and radial directions. The length–diameter ratio of the high-pressure chamber (a typical multi-dimensional parameter) is investigated. Different length–diameter ratios can affect the maximum pressure drop and the loss of total pressure impulse through the vent-hole, then the muzzle velocity and the launch acceleration of projectiles can be influenced directly. This article puts forward a new prediction tool for the understanding and design of transient processes in high-low pressure

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.

Reduction of Discrete-Frequency Fan Noise Using Slitlike Expansion Chambers

Directory of Open Access Journals (Sweden)

Akira Sadamoto

2003-01-01

Full Text Available As is generally known, discrete-frequency noises are radiated from fans due to rotor-stator interaction. Their fundamental frequency is the blade-passage frequency, which is determined by the number of rotor blades and their rotating speeds. To reduce such noises, several types of silencers have been designed. Among them, the authors noted a slitlike expansion chamber (hereafter referred to as slit, for simplicity and have studied its performance. A slit is a simple expansion chamber with a very short axial length that is placed in a duct. A slit with a circular cross-section that is concentric with a circular duct may be studied using the same interpretation as is used for a side-branch resonator muffler (closed-end tube connected to a duct; that is, the resonant frequency of a slit depends on its depth (with an open-end correction. It is expected, hence, that a slit might be applicable as a simple and axially compact silencer that is effective on discrete-frequency noises. In this article, the properties of a slit are introduced, and the applicability of a slit to actual rotating machinery is described using experimental data.

Temperature Studies for ATLAS MDT BOS Chambers

CERN Document Server

Engl, A.; Biebel, O.; Mameghani, R.; Merkl, D.; Rauscher, F.; Schaile, D.; Ströhmer, R.

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 ...

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].

A adaptação do técnico de radiologia às novas tecnologias The adaptation of the radiologic technician to new technologies

Directory of Open Access Journals (Sweden)

Célia Maria Ferreira Felício

2010-02-01

Full Text Available OBJETIVO: Pretendeu-se avaliar a capacidade de adaptação dos técnicos de radiologia às novas tecnologias, avaliar os fatores relacionados com o processo de implementação das novas tecnologias e conhecer algumas vantagens e desvantagens identificadas pelos técnicos de radiologia. MATERIAIS E MÉTODOS: Tratou-se de um estudo descritivo e transversal. Os dados foram recolhidos através de um questionário estruturado em quatro componentes - caracterização da amostra, avaliação da opinião acerca das novas tecnologias, escala de satisfação com a utilização de sistemas de informação, e a escala de avaliação geral dos sistemas de informação -, tendo sido garantidos o anonimato e a confidencialidade dos dados. Participaram neste estudo 58 técnicos de radiologia a exercer funções em instituições hospitalares da região de Trás-os-Montes e Alto Douro, Portugal. RESULTADOS: Os resultados obtidos permitiram-nos constatar que a totalidade dos técnicos afirma que a nova tecnologia é vista como uma ferramenta de trabalho com utilidade para a sua atividade profissional, sendo que as vantagens da implementação das novas tecnologias refletem-se na facilidade de acesso ao arquivo radiológico do usuário, na diminuição da perda de informação, na rapidez de execução dos exames e no rigor dos registros do usuário. CONCLUSÃO: Podemos dizer, de uma maneira geral, que os técnicos de radiologia se adaptaram de uma forma muito satisfatória às novas tecnologias implementadas nos seus departamentos.OBJECTIVE: The present study was aimed at evaluating radiologic technicians' capacity to adapt to new technologies, besides investigating which factors could be related to the implementation of new technologies and to identify some of its possible advantages and disadvantages as well. MATERIALS AND METHODS: The present descriptive and cross-sectional study evaluated data collected by means of a structured questionnaire divided into four

Brookhaven National Laboratory's multiparticle spectrometer drift chamber system

International Nuclear Information System (INIS)

Etkin, A.; Kramer, M.A.

1979-01-01

A system of drift chambers is being built to replace the present spark chambers in the Brookhaven National Laboratory's Multiparticle Spectrometer. This system will handle a beam of approx. 3 million particles per second and have a resolution of 200 μm. A summary of the status of the chambers and the custom integrated circuits is presented. The data acquisition system is described. Prototype chambers have been built and tested with results that are consistent with the expected chamber properties

The Dovyren Intrusive Complex (Southern Siberia, Russia): Insights into dynamics of an open magma chamber with implications for parental magma origin, composition, and Cu-Ni-PGE fertility

Science.gov (United States)

Ariskin, Alexey; Danyushevsky, Leonid; Nikolaev, Georgy; Kislov, Evgeny; Fiorentini, Marco; McNeill, Andrew; Kostitsyn, Yuri; Goemann, Karsten; Feig, Sandrin T.; Malyshev, Alexey

2018-03-01

misbalance reflects a significant deficit of the YDM in incompatible elements, which argues that 60-70% of basaltic melts had to have been expelled from the Dovyren magma chamber during its consolidation. A possible scenario of the evolution of the open magma chamber is proposed.

Anterior chamber angle assessment using gonioscopy and ultrasound biomicroscopy.

Science.gov (United States)

Narayanaswamy, Arun; Vijaya, Lingam; Shantha, B; Baskaran, Mani; Sathidevi, A V; Baluswamy, Sukumar

2004-01-01

Comparison of anterior chamber angle measurements using ultrasound biomicroscopy (UBM) and gonioscopy. Five hundred subjects were evaluated for grading of angle width by the Shaffer method. UBM was done in the same group to document angle width, angle opening distance (AOD 500), and anterior chamber depth. Biometric parameters were documented in all subjects. UBM and gonioscopic findings were compared. A study was conducted in 282 men and 218 women with a mean age of 57.32 +/- 12.48 years. Gonioscopic grading was used to segregate occludable (slit-like, grades 1 and 2) from nonoccludable (grades 3 and 4) angles. Subjective assessment by gonioscopy resulted in an overestimation of angle width within the occludable group when compared with values obtained by UBM. This did not affect the segregation of occludable versus nonoccludable angles by gonioscopy. Biometric parameters in eyes with occludable angles were significantly lower in comparison with eyes with nonoccludable angles, except for lens thickness. AOD 500 correlated well with angle width. We concluded that clinical segregation into occludable and nonoccludable angles by an experienced observer using gonioscopy is fairly accurate. However, UBM is required for objective quantification of angles, and AOD 500 can be a reliable and standard parameter to grade angle width.

ENVOLVIMENTO DO PÚBLICO NA AVALIAÇÃO DE TECNOLOGIAS EM SAÚDE: EXPERIÊNCIAS MUNDIAIS E DO BRASIL

Directory of Open Access Journals (Sweden)

Aline Silveira Silva

2015-10-01

Full Text Available A Avaliação de Tecnologias em Saúde (ATS é um campo multidisciplinar de análise de políticas, que estuda as implicações clínicas, sociais, éticas e econômicas das tecnologias em saúde, levando-se em consideração eficácia, efetividade, segurança, custo-efetividade, etc. Entretanto, impactos éticos, legais e sociais, direcionados a perspectivas de pacientes e sociedade, são postergados em detrimento de atributos clínicos e econômicos. Com a crescente ênfase sobre o engajamento dos pacientes pelo direito aos seus próprios cuidados, há necessidade de determinar meios efetivos para envolver a sociedade nos processo de avaliação e de decisão. O objetivo do presente trabalho foi explorar os desafios presentes no contexto internacional e nacional para envolver o público nos processos de ATS do Sistema Único de Saúde (SUS. Adotou-se método integrativo, composto por revisão da literatura e análise de registro oficiais do Ministério da Saúde. A análise dos resultados mostrou experiências internacionais em franco desenvolvimento, destacando-se Reino Unido e Canadá. No Brasil, existem instrumentos legais para envolver o cidadão na ATS, mas sua implementação é recente e tem sido realizada gradualmente. Os principais desafios em âmbito nacional e internacional estão relacionados aos aspectos culturais. Com base nos resultados foi possível apontar proposições para aprimorar esses mecanismos de envolvimento. Descritores: Avaliação da Tecnologia Biomédica; participação social; participação comunitária. 

A case study to estimate thermal conductivity of ABS in Cold Climate Chamber

OpenAIRE

Mughal, Umair Najeeb; Makarova, Marina; Virk, Muhammad Shakeel; Polanco Pinerez, Geanette

2015-01-01

Open Access (Romeo Green journal), publishers version / PDF may be used http://www.scirp.org/journal/wjet/ Non steady state thermal conductivity of ABS was estimated using an analytical approach in a Cold Climate Chamber at ?10?C and ?14?C. Two hollow cylinders of ABS of varying thickness were used to estimate the conductivity. The material was porous but the porosity was unknown. This paper is a case study to understand, if it is reasonable to estimate the thermal conductivity using th...

Note: Small anaerobic chamber for optical spectroscopy

Energy Technology Data Exchange (ETDEWEB)

Chauvet, Adrien A. P., E-mail: adrien.chauvet@gmail.com; Chergui, Majed [Ecole Polytechnique Fédérale de Lausanne (EPFL), Laboratoire de Spectroscopie Ultrarapide, ISIC, Faculté des Sciences de Base, Station 6, 1015 Lausanne (Switzerland); Agarwal, Rachna; Cramer, William A. [Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907 (United States)

2015-10-15

The study of oxygen-sensitive biological samples requires an effective control of the atmosphere in which they are housed. In this aim however, no commercial anaerobic chamber is adequate to solely enclose the sample and small enough to fit in a compact spectroscopic system with which analysis can be performed. Furthermore, spectroscopic analysis requires the probe beam to pass through the whole chamber, introducing a requirement for adequate windows. In response to these challenges, we present a 1 l anaerobic chamber that is suitable for broad-band spectroscopic analysis. This chamber has the advantage of (1) providing access, via a septum, to the sample and (2) allows the sample position to be adjusted while keeping the chamber fixed and hermetic during the experiment.

A large-area glass-resistive plate chamber with multistrip readout

CERN Document Server

Petrovici, M; Hildenbrand, K D; Augustinski, G; Ciobanu, M; Cruceru, I; Duma, M; Hartmann, O; Koczón, P; Kress, T; Marquardt, M; Moisa, D; Petris, M; Schröder, C; Simion, V; Stoicea, G; Weinert, J

2002-01-01

A completely new configuration of a glass resistive-plate chamber (GRPC) was built and tested. It consists of a double two-gap structure of electrodes with an active area of about 400 cm sup 2 and is read out via a central multistrip printed circuit board. In measurements with a sup 6 sup 0 Co source and p, d particles of 1.5 A GeV time resolutions better than 80 ps, position resolution along the strips of 5-6 mm and efficiencies larger than 95% were obtained using available fast standard electronics. These results open the possibility of constructing compact TOF detectors of high resolution and high granularity.

Plasma chemistry in wire chambers

International Nuclear Information System (INIS)

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 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

A tecnologia de remoção de fósforo: gerenciamento do elemento em resíduos industriais

Directory of Open Access Journals (Sweden)

Mariana Manzoni Maroneze

2014-07-01

Full Text Available As elevadas concentrações de fósforo em águas residuárias industriais é uma das principais causas da eutrofização de corpos hídricos receptores, havendo em virtude disto, uma crescente preocupação com o gerenciamento das cargas de fósforo dos efluentes industriais. Além dos aspectos de contenção ambiental, é estrategicamente desejável que os processos de tratamento permitam a recuperação e o reúso deste elemento que é considerado de elevada demanda biológica. Neste sentido, esta revisão objetiva descrever e analisar criticamente o estado atual das tecnologias de gerenciamento de fósforo em águas residuais industriais, com ênfase no reúso do elemento. As tecnologias consideradas incluem abordagens químicas (precipitação química e adsorção, biológicas (sistemas bacterianos, uso macroalgas e microalgas além de técnicas de fertirrigação.

Qualidade de Vida na Palma da Mão: tecnologias móveis digitais, vigilância e visibilidade na busca pelo bem-estar

Directory of Open Access Journals (Sweden)

Erika Oikawa

2013-12-01

Full Text Available Este trabalho busca refletir como as tecnologias móveis digitais são apropriadas no cotidiano das pessoas na busca pelo bem-estar individual e coletivo, analisando-se principalmente a possibilidade desses dispositivos em promover interações ubíquas e possibilitar a formação de smart mobs. Para isso, primeiramente, apresenta-se um panorama geral sobre como essas tecnologias vêm transformando a vida social contemporânea. Em seguida, reflete-se sobre como características desses dispositivos móveis podem ajudar a alcançar as metas de uma vida mais regrada, por possibilitarem uma interação constante entre pessoas com os mesmos objetivos, e, ao mesmo tempo, promover um regime de visibilidade e vigilância permanente.

Wire chamber degradation at the Argonne ZGS

International Nuclear Information System (INIS)

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

Drift chamber vertex detectors for SLC/LEP

Energy Technology Data Exchange (ETDEWEB)

Hayes, K G

1988-03-01

Factors influencing the design of drift chamber vertex detectors for SLC and LEP are discussed including global strategy, chamber gas, cell design, and signal processing. The designs of the vertex chambers for the L3 and OPAL experiments at LEP and the Mark II experiment at the SLC are described.

Radon-daughter chamber instrumentation system reference manual

International Nuclear Information System (INIS)

Showalter, R.; Johnson, L.

1985-01-01

The radon-daughter chamber instrumentation system collects environmental data from the radon-daughter chamber. These data are then recorded on a Tandberg system tape cartridge and transmitted to the HP-1000 computer for processing. Generators which inject radon and condensation nuclei into the chamber are also included with the instrumentation system

"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.

PWCs and drift chambers at ISABELLE

International Nuclear Information System (INIS)

Okuno, H.; Teramoto, Y.; Wheeler, C.D.

1978-01-01

Rate effects in proportional chambers and drift chambers are addressed first. The widely used high-gas-gain chambers would have impaired performance at ISABELLE data rates. Improvement can be expected with lower gas gain, and this possibility is investigated with respect to position and time resolution. Results on chamber lifetime are summarized; space-charge effects, gain saturation, and radiation hardness of electronics are considered. The resolution of drift chambers is discussed in some detail; time resolution, double pulse resolution, and momentum resolution and multiple scattering are included. The expected high multiplicity of tracks from a single event, the high event rates, and the requirement for low gas gain necessitate revision of the methods for measuring the second coordinate. Known methods of two-dimensional point localization are summarized according to spatial accuracy, electronics requirements, and multihit capability. Delay lines, charge division, and cathode strips are considered. Particle identification by means of measurement of the relativistic rise of energy loss by conventional and unconventional means was investigated. 32 references, 3 figures, 4 tables

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.

Editorial: Ensino e prática da tradução: o papel das novas tecnologias

Directory of Open Access Journals (Sweden)

Carolina Barcellos

2018-06-01

Essa edição da Revista Texto Livre foi especialmente preparada para dar destaque à interface entre tradução e tecnologia e, nesse sentido, fornece um panorama variado dos trabalhos atualmente produzidos no nosso país. Sem dúvida, esse conjunto de trabalhos é uma contribuição à disseminação de conhecimento e um incentivo a novos (e necessários! pesquisadores interessados em testar os limites dessa interface.

AS TECNOLOGIAS DA INFORMAÇÃO E COMUNICAÇÃO (TICs) E OS DESAFIOS DA INCLUSÃO: A CRIAÇÃO DE AULAS SINALIZADAS NO CONTEXTO DO ENSINO SUPERIOR

OpenAIRE

Isabela Martins Miranda; Victor Luiz Alves Mourão; Ana Luisa Borba Gediel

2017-01-01

As tecnologias de Informação e Comunicação (TICs) são, atualmente, um dos maiores facilitadores na inserção de surdos nas Instituições de Ensino Superior (GEDIEL; SOARES; OLIVEIRA, 2016). Porém, construir essas tecnologias permanece um desafio enfrentado pelos profissionais envolvidos nessa tarefa. A unidade de ensino à distância de uma Instituição de Ensino Superior na Zona da Mata Mineira criou um novo conceito de aula visando a ensejar o ensino-aprendizagem de um surdo estudante de ciência...

Mixed field dosimetry with the twin chamber technique

International Nuclear Information System (INIS)

Burger, G.; Maier, E.

1974-04-01

For the separate dosimetry of the neutron- and gamma-component in a mixed beam it is principally possible to use two ionization chambers with different ratios of neutron- to gamma sensitivity. Several authors proposed for this purpose the use of a homogenious TE-chamber filled with the TE-gas and of a carbon-chamber filled with CO 2 -gas. This chamber combination is also commercially available in several countries. The chambers are normally equipped with a continuous gas-flow provision and with a waterproof-housing for the use within liquid phantoms. The application of such chambers for mixed field dosimetry in the intercomparison project of the ICRU at the RARAF-facility in Brookhaven (International Neutron Dosimetry Intercomparison - INDI) is described. (orig./HP) [de

Drift chamber tracking with neural networks

International Nuclear Information System (INIS)

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

Cooperação Internacional em Ciência e Tecnologia: Refletindo Conceitos e Questões Contemporâneas

Directory of Open Access Journals (Sweden)

Maria Clotilde Meirelles Ribeiro

2014-12-01

Full Text Available O artigo discute a cooperação internacional para o desenvolvimento no eixo da Ciência e Tecnologia (C&T, analisando questões cruciais contemporâneas e questões brasileiras específicas. Partindo de contribuições de relevantes autores, o trabalho focaliza os conceitos centrais de ciência, tecnologia e cooperação internacional em C&T, com distintas visões de especialistas em diferentes períodos. Na sequência, aborda tipologias da cooperação internacional, introduzindo uma reflexão sobre a técnica e a natureza humana, e sobre distinções entre “técnica” e “tecnologia”, bem como especificidades dos vetores da cooperação científico-tecnológica e da cooperação técnica. Prosseguindo, o artigo traz um breve histórico da trajetória da cooperação internacional em C&T, notadamente nos momentos demarcados pela Guerra Fria, aporta exemplos concretos e debate dilemas, oportunidades, riscos e desafios, bem como a realidade do Brasil diante deste instrumento da política externa dos governos.

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…

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.

An experimental propane bubble chamber

International Nuclear Information System (INIS)

Rogozinski, A.

1957-01-01

Describes a propane bubble chamber 10 cm in diameter and 5 cm deep. The body of the chamber is in stainless steel, and it has two windows of polished hardened glass. The compression and decompression of the propane are performed either through a piston in direct contact with the liquid, or by the action on the liquid, through a triple-mylar-Perbunan membrane, of a compressed gas. The general and also optimum working conditions of the chamber are described, and a few results are given concerning, in particular, the tests of the breakage-resistance of the windows and the measurements of the thermal expansion of the compressibility isotherm for the propane employed. (author) [fr

Very high intensity reaction chamber design

International Nuclear Information System (INIS)

Devaney, J.J.

1975-09-01

The problem of achieving very high intensity irradiation by light in minimal regions was studied. Three types of irradiation chamber are suggested: the common laser-reaction chamber, the folded concentric or near-concentric resonator, and the asymmetric confocal resonator. In all designs the ratio of high-intensity illuminated volume to other volume is highly dependent (to the 3 / 2 power) on the power and fluence tolerances of optical elements, primarily mirrors. Optimization of energy coupling is discussed for the common cavity. For the concentric cavities, optimization for both coherent and incoherent beams is treated. Formulae and numerical examples give the size of chambers, aspect ratios, maximum pass number, image sizes, fluences, and the like. Similarly for the asymmetric confocal chamber, formulae and numerical examples for fluences, dimensions, losses, and totally contained pass numbers are given

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...... a differential equation applying several simplifications and approximations leading to discrepancies between theory and experiments [3]. The theory predicts the collection efficiency as a function of the electrical field and was applied for both air filled ionization chambers and liquid filled ionization...... chambers. For liquids the LET can be roughly deduced from the collection efficiency dependency on the electrical field inside a liquid ionization chambers [4] using an extrapolation method. We solved the fundamental differential equation again presented by Jaffe numerically, but now taking into account...

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...

Practical electron dosimetry: a comparison of different types of ionization chambers

International Nuclear Information System (INIS)

Dohm, O.S.; Christ, G.

2002-01-01

Since Markus chambers are no longer recommended in the 1997 DIN 6800-2 version there are uncertainties as to the use of alternative chamber types for electron dosimetry. Therefore, we performed a comparison between different types of ionization chambers. In particular, the widespread Farmer and Roos chambers were compared with the Markus chamber for polarity effect, chamber-to-chamber variation, and deviations of the measured absorbed dose relative to the value obtained with the Roos chamber (which is regarded as an ideal Bragg-Gray-chamber). The perturbation correction factor at 60 Co radiation was determined experimentally as 1,029 ± 0,5% (Roos chamber) and 1,018 ± 0,5% (Markus chamber) for the investigated plane-parallel chambers. In addition, we could show that the Roos chambers do not have a larger chamber-to-chamber variation than the Farmer chambers. Likewise, our results suggest that Farmer chambers could be used for electron energies above 6 MeV. (orig.) [de

Sensitivity of gaseous xenon ionisation chambers (1961)

International Nuclear Information System (INIS)

Schuhl, C.

1960-01-01

It seems advantageous to fill an ionization chamber with xenon gas when this chamber is used for measuring a low intensity and high energy electron or positron beam, or monitoring a gamma beam. In the study of 5 to 50 MeV electrons, xenon allows for the ionization chamber yield, an improvement of a factor 4,5. (author) [fr

Ionization chamber correction factors for MR-linacs.

Science.gov (United States)

Pojtinger, Stefan; Dohm, Oliver Steffen; Kapsch, Ralf-Peter; Thorwarth, Daniela

2018-06-07

Previously, readings of air-filled ionization chambers have been described as being influenced by magnetic fields. To use these chambers for dosimetry in magnetic resonance guided radiotherapy (MRgRT), this effect must be taken into account by introducing a correction factor k B . The purpose of this study is to systematically investigate k B for a typical reference setup for commercially available ionization chambers with different magnetic field strengths. The Monte Carlo simulation tool EGSnrc was used to simulate eight commercially available ionization chambers in magnetic fields whose magnetic flux density was in the range of 0-2.5 T. To validate the simulation, the influence of the magnetic field was experimentally determined for a PTW30013 Farmer-type chamber for magnetic flux densities between 0 and 1.425 T. Changes in the detector response of up to 8% depending on the magnetic flux density, on the chamber geometry and on the chamber orientation were obtained. In the experimental setup, a maximum deviation of less than 2% was observed when comparing measured values with simulated values. Dedicated values for two MR-linac systems (ViewRay MRIdian, ViewRay Inc, Cleveland, United States, 0.35 T/ 6 MV and Elekta Unity, Elekta AB, Stockholm, Sweden, 1.5 T/7 MV) were determined for future use in reference dosimetry. Simulated values for thimble-type chambers are in good agreement with experiments as well as with the results of previous publications. After further experimental validation, the results can be considered for definition of standard protocols for purposes of reference dosimetry in MRgRT.

Ionization chamber correction factors for MR-linacs

Science.gov (United States)

Pojtinger, Stefan; Steffen Dohm, Oliver; Kapsch, Ralf-Peter; Thorwarth, Daniela

2018-06-01

Previously, readings of air-filled ionization chambers have been described as being influenced by magnetic fields. To use these chambers for dosimetry in magnetic resonance guided radiotherapy (MRgRT), this effect must be taken into account by introducing a correction factor k B. The purpose of this study is to systematically investigate k B for a typical reference setup for commercially available ionization chambers with different magnetic field strengths. The Monte Carlo simulation tool EGSnrc was used to simulate eight commercially available ionization chambers in magnetic fields whose magnetic flux density was in the range of 0–2.5 T. To validate the simulation, the influence of the magnetic field was experimentally determined for a PTW30013 Farmer-type chamber for magnetic flux densities between 0 and 1.425 T. Changes in the detector response of up to 8% depending on the magnetic flux density, on the chamber geometry and on the chamber orientation were obtained. In the experimental setup, a maximum deviation of less than 2% was observed when comparing measured values with simulated values. Dedicated values for two MR-linac systems (ViewRay MRIdian, ViewRay Inc, Cleveland, United States, 0.35 T/ 6 MV and Elekta Unity, Elekta AB, Stockholm, Sweden, 1.5 T/7 MV) were determined for future use in reference dosimetry. Simulated values for thimble-type chambers are in good agreement with experiments as well as with the results of previous publications. After further experimental validation, the results can be considered for definition of standard protocols for purposes of reference dosimetry in MRgRT.

Análise crítica da contribuição das tecnologias gerenciais para a relação entre trabalho e educação

Directory of Open Access Journals (Sweden)

Rafael Rodrigo Mueller

2012-06-01

Full Text Available O objetivo do artigo é analisar das tecnologias gerenciais e sua relação histórica com a educação. Para tanto, torna-se imprescindível verificarmos o desenvolvimento dos métodos e técnicas de treinamento concebidos nos Estados Unidos por Charles Allen, em 1919, que foram intensificados a partir do que ficou conhecido como “Treinamento dentro da Indústria” ou Training Within Industry (TWI, em 1940, e evoluíram, após a Segunda Guerra Mundial, e o que se caracterizou como “Gerenciamento Japonês”, quando finalmente fundamentaram-se como um elemento-chave do “Sistema Toyota de Produção” (STP. O caráter ideológico que perpassa e é característico das tecnologias gerenciais foi verificado por intermédio da relação de tal manifestação de tecnologia com os ideais educacionais presentes tanto no discurso de managers como nas recomendações dos órgãos multilaterais e suas determinações voltadas à educação nas últimas três décadas.

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.

D0 central tracking chamber performance studies

International Nuclear Information System (INIS)

Pizzuto, D.

1991-12-01

The performance of the completed DO central tracking chamber was studied using cosmic rays at the State University of New York at Stony Brook. Also studied was a prototype tracking chamber identical in design to the completed DO tracking chamber. The prototype chamber was exposed to a collimated beam of 150 GeV pions at the Fermilab NWA test facility. Results indicate an RΦ tracking resolution compatible with the limitations imposed by physical considerations, excellent 2 track resolution, and a high track reconstruction efficiency along with a good rejection power against γ → e + e - events

Ações de pesquisa e extensão no projeto laboratório de tecnologias intelectuais

Directory of Open Access Journals (Sweden)

Isa Maria Freire

Full Text Available Este trabalho apresenta os primeiros resultados do Projeto Laboratório de Tecnologias Intelectuais, em desenvolvimento mediante parceria entre o Departamento de Ciência da Informação e o Programa de Pós-Graduação em Ciência da Informação da Universidade Federal da Paraíba. O Projeto visa promover ações para propiciar o acesso à informação e à formação de competências em informação, através da Internet, bem como a troca produtiva de conhecimentos e experiências entre pesquisadores, bolsistas e usuários. Propõe ações em nível de pesquisa (o projeto em si, ensino (educação a distância e extensão (cursos e tutoriais, abordando as tecnologias intelectuais e suas aplicações em um ambiente de compartilhamento de conhecimentos. Este artigo relata resultados já alcançados desde o início do Projeto, em 2009, especialmente a experiência com a Oficina de Criatividade Científica, curso de extensão presencial com atividades on-line, que proporciona aos participantes a oportunidade de conhecer e trabalhar as abordagens e metodologias do campo da Ciência da Informação.

Solar drying: An appropriate technology for the north Argentina; Secado solar: Una tecnologia apropiada para el norte argentino

Energy Technology Data Exchange (ETDEWEB)

Zurlo, Hugo D; Vergara, Liliana; Spotorno, Ruben; Benitez, Francisco; De Pedro, Jorge; Cervino, Veronica; Monzon, Sergio [Universidad Tecnologica Nacional, Chaco (Argentina)

2000-07-01

The results concerning to solar drying of nutritious products for rehearsed a low cost solar dryer, adapted to the area, composed by a plane solar collector of 2 m{sup 2} and a drying camera with capacity for, approximately, 5 kg of product. The objectives of the work were: a) to develop a low cost solar dry, capable to dehydrate products for human alimentary use; b) to transfer the developed technology to low resources rural communities through the INCUPO (Institute of Popular Culture) and to small producers through the INTA (National Institute of Agricultural Technology) and c) to diffuse the practice of the solar drying among small producers. The diffusion and transfer of the developed technology to small rural producers, contribute to improve their quality of life when facilitating them additional revenues for productive diversification, besides the contribution to the sustainable use of the forest like source of non conventional nutritious resources contributing to the task of cultural rescue faced by organizations like the INCUPO. [Spanish] Se exponen los resultados concernientes al secado solar de productos alimenticios para consumo humano. Se diseno, construyo y ensayo un secador solar de bajo costo, adaptado a la zona, compuesto por un colector solar plano de 2m{sup 2} y una camara de secado con capacidad para, aproximadamente, 5 kg de producto fresco. Los objetivos del trabajo fueron: a) desarrollar un secadero solar de bajo costo, apto para deshidratar productos para uso alimentario humano; b) transferir la tecnologia desarrollada a comunidades rurales de bajos recursos a traves del INCUPO (Instituto de Cultura Popular) y a pequenos productores a traves del INTA (Instituto Nacional de Tecnologia Agropecuaria) y c) difundir la practica del secado solar entre productores frutihorticolas. La difusion y transferencia de la tecnologia desarrollada a pequenos productores rurales, contribuye a mejorar su calidad de vida al posibilitarles ingresos adicionales

Argus drift chamber

Energy Technology Data Exchange (ETDEWEB)

Danilov, M; Nagovizin, V; Hasemann, H; Michel, E; Schmidt-Parzefall, W; Wurth, R; Kim, P

1983-11-15

The ARGUS detector came into operation at the DORIS-II e/sup +/s/sup -/ storage ring at the end of 1982. Its two meter long drift chamber contains 5940 sense and 24588 field wires organized in uniform 18x18.8 mm/sup 2/ drift cells filling the whole volume. These cells form 36 layers, 18 of which provide stereo views. Each sense wire is equipped with a single hit TDC and ADC for coordinate and dE/dx measurements. The chamber is operated with propane to improve momentum and dE/dx resolution. The drift chamber design and initial performance are presented. With a very crude space-time relation approximation and without all the necessary corrections applied a spatial resolution of about 200 ..mu..m was obtained for half of the drift cell volume. Further corrections should improve this result. An intrinsic dE/dx resolution of 4.2% and an actual resolution of 5% were obtained for cosmic muons and also for Bhabha scattered electrons. An actual dE/dx resolution of 5.6% was obtained for pions from e/sup +/e/sup -/ annihilation data with almost no track selection. A relativistic rise of 30% was observed in good agreement with theory. The long-term stability is still to be investigated.

PORTFOLIO PROJECT MANAGEMENT (PPM EM PESQUISA, DESENVOLVIMENTO E INOVAÇÃO (PD&I VOLTADO PARA AÇÕES DE UMA INSTITUIÇÃO DE CIÊNCIA E TECNOLOGIA (ICT

Directory of Open Access Journals (Sweden)

Antônio Genésio Vasconcelos Neto

2014-07-01

Full Text Available A oferta de tecnologias resultantes de atividades de pesquisa e desenvolvimento (P&D por parte das Instituições de Ciência e Tecnologia (ICT é um diferencial competitivo a ser buscado, tendo em vista sua importância para o posicionamento estratégico do país, bem como para contribuição do desenvolvimento, trazendo consigo benefícios sociais, ambientais e econômicos. Diante deste desafio, apresenta-se uma proposta de Portfolio Project Management (PPM de projetos de New Product Development (NPD em uma ICT, tendo em vista a necessidade de pesquisa e desenvolvimento de tecnologias fomentadoras de oportunidades para que os setores produtivos possam implementá-las e atuarem na promoção de inovações tecnológicas na sociedade. Para isto, apresentam-se resultados práticos decorrentes de action research, com o intuito de oportunizar uma visão ambidestra de reestruturação organizacional focada cultura de inovação tecnológica.

The wide gap resistive plate chamber

International Nuclear Information System (INIS)

Crotty, I.; Lamas Valverde, J.; Hatzifotiadou, D.; Williams, M.C.S.; Zichichi, A.

1995-01-01

The resistive plate chamber (RPC) has good time and position resolution; these factors (coupled to its simple construction) make it an attractive candidate for muon trigger systems at future colliders. However, operated in spark mode, the RPC has severe rate problems that make it unusable above 10 Hz/cm 2 . We have previously published our results concerning the operation of the RPC in spark and in avalanche mode; we have shown that the rate limit can be increased to 150 Hz/cm 2 if the RPC is operated in avalanche mode. Here, we discuss the performance of chambers with 6 and 8 mm gas gaps (compared to the more usual 2 mm gap). We outline the reasons for this choice, and also discuss anode versus cathode strip readout. We have measured the efficiency versus flux, and also show that an enhanced rate limit can be obtained if only a small region of the chamber is exposed to the beam (spot illumination). Finally we have tested the performance of chambers constructed with other materials for the resistiv e plate and compare it to chambers constructed with our preferred plastic, melamine laminate. (orig.)

Resultados do Grupo de Trabalho de Tecnologias Avançadas IDE do Projecto OTALEX C

OpenAIRE

Vivas, Pedro; Álvarez, Rafael; Mateus, Júlio; Pavo, Marcos; Rubio, J.M.; González, Julián; Soriano, Marcos; Caballero, Carmen; Aparício, Alberto; Batista, T.; Carriço, Cristina; Cabezas, José; Fernández, Luis; Jiménez, Alberto; Gamero, Ulises

2013-01-01

Apresentam-se os resultado do Grupo de Trabalho de Tecnologias Avançadas IDE do projeto OTALEX-C, sendo estes: a geração de dados interligados de elementos geográficos do território OTALEX-C para a publicação de uma Web Semântica, e a captura e publicação de dados ambientais através de serviços padronizados de registo de observações com recurso a sensores, aplicando a standard SOS definida pela OGC. POCTEP 2007-2013

HYLIFE-II reactor chamber design refinements

International Nuclear Information System (INIS)

House, P.A.

1994-06-01

Mechanical design features of the reactor chamber for the HYLIFE-II inertial confinement fusion power plant are presented. A combination of oscillating and steady, molten salt streams (Li 2 BeF 4 ) are used for shielding and blast protection of the chamber walls. The system is designed for a 6 Hz repetition rate. Beam path clearing, between shots, is accomplished with the oscillating flow. The mechanism for generating the oscillating streams is described. A design configuration of the vessel wall allows adequate cooling and provides extra shielding to reduce thermal stresses to tolerable levels. The bottom portion of the reactor chamber is designed to minimize splash back of the high velocity (>12 m/s) salt streams and also recover up to half of the dynamic head. Cost estimates for a 1 GWe and 2 GWe reactor chamber are presented

A summary of EPA radon chamber tests and results for rounds 3 and 4 of the National Radon Measurement Proficiency Program

International Nuclear Information System (INIS)

Smith, J.M.; Sensintaffar, E.L.

1993-02-01

The US Environmental Protection Agency's Office of Radiation and Indoor Air (ORIA) established the National Radon Measurement Proficiency (RMP) Program in 1986. Through this voluntary program, participants can demonstrate their ability to measure radon and/or radon decay products by submitting their detection devices to a blind test in a designated radon chamber. In this report, two EPA radon and radon decay products test chambers (chambers A and C) located at the National Air and Radiation Environmental Laboratory in Montgomery, Alabama are described. These chambers were used to expose detectors submitted for testing in Round 4 of the National Radon Measurement Proficiency Program and are used routinely for calibration purposes. Also described are the measurement and calibration procedures which were used to establish the official target values for radon and radon decay products concentrations during RMP Round 4 testing. The results for RMP Round 3 (conducted at the US DOE Environmental Measurements Laboratory radon chamber in New York) and RMP Round 4 (conducted in the two NAREL chambers) are discussed and compared. Following Round 4, the NAREL staff analyzed the collective performance for each measurement method tested in these rounds and found that all methods agreed with the target values within expected limits except for RPISU's and charcoal adsorbers. After analyzing the RMP4 results, NAREL staff spent several months evaluating the difference in charcoal adsorber response between Round 3 and 4 by performing radon chamber tests using EPA 4-inch, open-faced charcoal adsorbers

Dilution refrigeration with multiple mixing chambers

International Nuclear Information System (INIS)

Coops, G.M.

1981-01-01

A dilution refrigerator is an instrument to reach temperatures in the mK region in a continuous way. The temperature range can be extended and the cooling power can be enlarged by adding an extra mixing chamber. In this way we obtain a double mixing chamber system. In this thesis the theory of the multiple mixing chamber is presented and tested on its validity by comparison with the measurements. Measurements on a dilution refrigerator with a circulation rate up to 2.5 mmol/s are also reported. (Auth.)

Copper removal and microbial community analysis in single-chamber microbial fuel cell.

Science.gov (United States)

Wu, Yining; Zhao, Xin; Jin, Min; Li, Yan; Li, Shuai; Kong, Fanying; Nan, Jun; Wang, Aijie

2018-04-01

In this study, copper removal and electricity generation were investigated in a single-chamber microbial fuel cell (MFC). Result showed that copper was efficiently removed in the membrane-less MFC with removal efficiency of 98.3% at the tolerable Cu 2+ concentration of 12.5 mg L -1 , the corresponding open circuit voltage and maximum power density were 0.78 V and 10.2 W m -3 , respectively. The mechanism analysis demonstrated that microbial electrochemical reduction contributed to the copper removal with the products of Cu and Cu 2 O deposited at biocathode. Moreover, the microbial community analysis indicated that microbial communities changed with different copper concentrations. The dominant phyla were Proteobacteria and Bacteroidetes which could play key roles in electricity generation, while Actinobacteria and Acidobacteria were also observed which were responsible for Cu-resistant and copper removal. It will be of important guiding significance for the recovery of copper from low concentration wastewater through single-chamber MFC with simultaneous energy recovery. Copyright © 2018 Elsevier Ltd. All rights reserved.

MDT Commissioning Procedures Guidelines for Certifying RFI Chambers

CERN Document Server

Beretta, M; Branchini, P; Kourkoumelis, C; Dubbert, J; Gazis, E N; Hertenberger, R; Hurst, P; Kojine, A; Lanza, A; Marin, A; Mockett, P; Petridou, C; Tskhadadze, E G; Valente, P; Wotschack, J; Xie, Y; Zhao, Z

2004-01-01

Aim of the document is the definition of a common set of guidelines and test procedures for commissioning the MDT chambers. Commissioning is different for Barrel and Endcap chambers. The former will be tested at a single chamber level before going to the ATLAS pit, ready for the last quick test before final installation, while the latter will be first tested at a single chamber level (phase one), then installed into the Small and Big Wheel sectors (SW and BW), tested after the integration (phase two) and transported to the ATLAS pit for final wheel installation. The present document concerns all tests, including those of phase two for Endcap chambers, but it is possible that some specific tests, at the moment not planned, will be implemented during the Endcap phase two commissioning. It is composed of three sections: 1 â€" Guidelines for checking chamber conformity, where the main rules for declaring that chambers conform to the reference drawings and requirements are described; 2 â€" Commissioning tests,...

Lifetime survivability of contaminated target-chamber optics

International Nuclear Information System (INIS)

Rainer, F.; Anderson, A.; Burnham, A.; Milam, D.; Turner, R.

1996-11-01

Target chambers used for Inertial Confinement Fusion (ICF) expose laser optics to a very hostile environment, not only from high-fluence laser irradiation but also x-ray irradiation and particulate debris from targets and chamber wall materials. Expendable debris shields provide the first line of defense to more costly optics upstream in the laser beam path to contaminants generated within the target chamber. However, the replacement of a large number of debris shields is also an expensive proposition so that extending their usable lifetime within the chamber is important. We have conducted tests to show that optics can both be cleaned and damaged by laser irradiation at 355 nm after being contaminated with potential chamber-wall materials such as B 4 C and Al 2 O 3 . Such optics can survive from one to hundreds of laser shots, depending on degree of contamination and laser fluence levels. Similarly, we have studied the survivability of optics that have been exposed to direct contamination from representative target materials irradiated in the target chamber. We have also studied the effects on optics that were not directly exposed to targets, yet received secondary exposure from the above directly-exposed samples

A Tecnologia EGS e sua Aplicação na Exploração de Gás de Xisto no Brasil

Directory of Open Access Journals (Sweden)

Vitor Mascarenhas Péres

2016-12-01

Full Text Available Na medida em que a demanda por energia se torna cada vez maior, se faz necessário explorar novas alternativas. Neste contexto, estão o gás de xisto, que revolucionou o mercado energético americano e que é extraído através do fraturamento hidráulico (fracking e a tecnologia Enhaced Geothermal System (EGS, sistemas geotérmicos que geram energia elétrica e que também utilizam o fraturamento hidráulico. Através de revisões bibliográficas e de dados de sites de notícias e artigos científicos sobre os dois temas, este artigo procurou abordar a possibilidade e a viabilidade de desenvolver os dois em conjunto no Brasil. O Brasil apresentou, assim, três áreas com potencial para desenvolver as duas tecnologias: a Bacia do Parecis, no Planalto Central, a Bacia do Paraná, na região Sul do país e a Bacia Sergipe-Alagoas, no Nordeste Setentrional. Entretanto, os impactos ambientais dos fraturamentos hidráulicos ainda tem dimensões desconhecidas, sendo possível citar sismos, contaminação de aquíferos como consequência de um possível vazamento de gás e a captação dos grandes volumes de água necessários para fraturamento do xisto. Concluiu-se, assim, que se faz necessário desenvolver mais estudos sobre a viabilidade dos desenvolvimentos das duas tecnologias nos locais sugeridos e sobre os possíveis impactos ambientais associados.

Characterization of Gas Transport Properties of Fractured Rocks By Borehole and Chamber Tests.

Science.gov (United States)

Shimo, M.; Shimaya, S.; Maejima, T.

2014-12-01

Gas transport characteristics of fractured rocks is a great concern to variety of engineering applications such as underground storage of LPG, nuclear waste disposal, CCS and gas flooding in the oil field. Besides absolute permeability, relative permeability and capillary pressure as a function of water saturation have direct influences to the results of two phase flow simulation. However, number of the reported gas flow tests for fractured rocks are limited, therefore, the applicability of the conventional two-phase flow functions used for porous media, such as Mualem-van Genuchten model, to prediction of the gas transport in the fractured rock mass are not well understood. The authors conducted the two types of in-situ tests, with different scales, a borehole gas-injection test and a chamber gas-injection test in fractured granitic rock. These tests were conducted in the Cretaceous granitic rocks at the Namikata underground LPG storage cavern construction site in Ehime Prefecture in Japan, preceding to the cavern scale gas-tightness test. A borehole injection test was conducted using vertical and sub-vertical boreholes drilled from the water injection tunnel nearly at the depth of the top of the cavern, EL-150m. A new type downhole gas injection equipment that is capable to create a small 'cavern' within a borehole was developed. After performing a series of preliminary tests to investigate the hydraulic conductivity and gas-tightness, i.e. threshold pressure, gas injection tests were conducted under different gas pressure. Fig.1 shows an example of the test results From a chamber test using a air pressurizing chamber with volume of approximately166m3, the gas-tightness was confirmed within the uncertainty of 22Pa under the storage pressure of 0.7MPa, however, significant air leakage occurred possibly through an open fracture intersecting the chamber just after cavern pressure exceeds the initial hydrostatic pressure at the ceiling level of the chamber. Anomalies

Vacuum Chamber for the Booster Bending Magnets

CERN Multimedia

CERN PhotoLab

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).

Construction and performance of large flash chambers

International Nuclear Information System (INIS)

Taylor, F.E.; Bogert, D.; Fisk, R.; Stutte, L.; Walker, J.K.; Wolfson, J.; Abolins, M.; Ernwein, J.; Owen, D.; Lyons, T.

1979-01-01

The construction and performance of 12' x 12' flash chambers used in a 340 ton neutrino detector under construction at Fermilab is described. The flash chambers supply digital information with a spatial resolution of 0.2'', and are used to finely sample the shower development of the reaction products of neutrino interactions. The flash chambers are easy and inexpensive to build and are electronically read out

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.

A dessubjetivação do trabalho: o homem como objeto da tecnologia Unsubjectivation of work: men as technology object

Directory of Open Access Journals (Sweden)

André Guimarães Augusto

2009-08-01

Full Text Available Este trabalho visa a apresentar uma reflexão crítica sobre a tecnologia a partir da obra de Marx. A tecnologia é compreendida como forma de organização do processo de trabalho sob as relações de produção capitalista. O processo de trabalho capitalista é apreendido como um duplo processo de objetivação e dessubjetivação do trabalho, sendo este último resultado da aplicação ao processo de produção das ciências que tem o homem como objeto.The purpose of this paper is to present a critical account of technology on the grounds of Marx's work. Technology is understood as a form of organization of work process under capitalist production relations. Capitalist work process is understood as a dual process of objectivation and unsubjectivation of work. Unsubjectivation of work is the result of application in work process of sciences that have man in its many dimensions as object.

The knife-edge chamber

International Nuclear Information System (INIS)

Barasch, E.F.; Bowcock, T.J.V.; Drew, M.M.; Elliott, S.M.; Lee, B.; McIntyre, P.M.; Pang, Y.; Popovic, M.; Smith, D.D.

1990-01-01

In this paper the design for a new technology for particle track detectors is described. Using standard IC fabrication techniques, a pattern of microscopic knife edges and field-shaping electrodes can be fabricated on a silicon substrate. The knife-edge chamber uniquely offers attractive performance for the track chambers required for SSC detectors, for which no present technology is yet satisfactory. Its features include: excellent radiation hardness (10 Mrad), excellent spatial resolution (∼20 μm), short drift time (20 ns), and large pulse height (1 mV)

Multiple chamber ionization detector

International Nuclear Information System (INIS)

Solomon, E.E.

1982-01-01

An ionization smoke detector employs a single radiation source in a construction comprising at least two chambers with a center or node electrode. The radioactive source is associated with this central electrode, and its positioning may be adjusted relative to the electrode to alter the proportion of the source that protrudes into each chamber. The source may also be mounted in the plane of the central electrode, and positioned relative to the center of the electrode. The central electrode or source may be made tiltable relative to the body of the detector

Ionization chamber gradient effects in nonstandard beam configurations

International Nuclear Information System (INIS)

Bouchard, Hugo; Seuntjens, Jan; Carrier, Jean-Francois; Kawrakow, Iwan

2009-01-01

Purpose: For the purpose of nonstandard beam reference dosimetry, the current concept of reporting absorbed dose at a point in water located at a representative position in the chamber volume is investigated in detail. As new nonstandard beam reference dosimetry protocols are under development, an evaluation of the role played by the definition of point of measurement could lead to conceptual improvements prior to establishing measurement procedures. Methods: The present study uses the current definition of reporting absorbed dose to calculate ionization chamber perturbation factors for two cylindrical chamber models (Exradin A12 and A14) using the Monte Carlo method. The EGSnrc based user-code EGS lowbar chamber is used to calculate chamber dose responses of 14 IMRT beams chosen to cause considerable dose gradients over the chamber volume as previously used by Bouchard and Seuntjens [''Ionization chamber-based reference dosimetry of intensity modulated radiation beams,'' Med. Phys. 31(9), 2454-5465 (2004)]. Results: The study shows conclusively the relative importance of each physical effect involved in the nonstandard beam correction factors of 14 IMRT beams. Of all correction factors involved in the dosimetry of the beams studied, the gradient perturbation correction factor has the highest magnitude, on average, 11% higher compared to reference conditions for the Exradin A12 chamber and about 5% higher for the Extradin A14 chamber. Other perturbation correction factors (i.e., P wall , P stem , and P cel ) are, on average, less than 0.8% different from reference conditions for the chambers and beams studied. The current approach of reporting measured absorbed dose at a point in water coinciding with the location of the centroid of the chamber is the main factor responsible for large correction factors in nonstandard beam deliveries (e.g., intensity modulated radiation therapy) reported in literature. Conclusions: To reduce or eliminate the magnitude of

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 (oxygen...

A small flat fission chamber

International Nuclear Information System (INIS)

Li Yijun; Wang Dalun; Chen Suhe

1999-01-01

With fission materials of depleted uranium, natural uranium, enriched uranium, 239 Pu, and 237 Np, the authors have designed and made a series of small flat fission chamber. The authors narrated the construction of the fission chamber and its technological process of manufacture, and furthermore, the authors have measured and discussed the follow correct factor, self-absorption, boundary effect, threshold loss factor, bottom scatter and or so

O uso de tecnologias móveis no ensino de ciências: uma experiência sobre o estudo dos ecossistemas costeiros da mata atlântica sul capixaba

Directory of Open Access Journals (Sweden)

Guilherme Augusto Maciel Ribeiro

2016-12-01

Full Text Available O uso das tecnologias de informação e comunicação (TICs é objeto de discussão por grande parte dos educadores brasileiros. Se por um lado é reconhecido como potencial recurso em favor dos processos ensino-aprendizagem, por outro, desperta grandes polêmicas no contexto escolar. Dessa forma, a partir de uma sequência didática fundamentada nos Três Momentos Pedagógicos de Delizoikov et al. (2002, o presente trabalho teve por objetivo promover uma discussão sobre o uso das tecnologias móveis no estudo dos ecossistemas costeiros de Mata Atlântica com alunos de uma escola pública municipal de Marataízes/ ES. Como fonte de obtenção de dados, realizou-se pesquisas bibliográficas em fontes de papel e virtuais, por intermédio smartphones. Além disso, promoveu-se uma aula de campo nos ecossistemas costeiros de Mata Atlântica situados na área geoescolar, ocasião em que as tecnologias móveis atuaram como instrumentos para identificação da fauna e flora mediante o uso de aplicativo, além de servir para o registro audiovisual que, posteriormente, foi transformado em objetos educativos que foram expostos para a comunidade escolar. Foi diagnosticado o grande interesse dos estudantes em utilizar as tecnologias móveis em situações de aprendizagem, o que sinaliza para a importância do uso das TICs como ferramentas educacionais, reforçando a potencial articulação dos recursos tecnológicos nos processos de ensino e aprendizagem em Ciências.

Lifetime tests for MAC vertex chamber

International Nuclear Information System (INIS)

Nelson, H.

1986-01-01

A vertex chamber for MAC was proposed in fall 1983 to increase precision in the measurement of the B hadron and tau lepton lifetimes. The chamber had to be placed within the existing central drift chamber, making access for repairs difficult and costly. Therefore for detector elements thin-walled aluminized mylar drift tubes (straws) were used because of their simplicity and robustness. The diameter of the drift tubes was 6.9 mm. The radial extent of the proposed chamber was from 3 cm to 10 cm, the inner wall of the central drift. It was clear that radiation levels, from synchrotron x-rays and overfocussed electrons, were potentially high. Since the drift distance is short in the straws, it was desirable to operate them at the highest possible gas gain, to achieve the best spatial resolution. There was a likelihood of drawing large currents in the chamber and thus causing radiation damage. Therefore a study of radiation hardness under the conditions of their proposed design was undertaken. In tests, argon-hydrocarbon mixtures consistently became unusable at ∼0.05 C/cm collected charge, due to anode buildup. Argon-CO 2 mixtures, while underquenched, were operational to 0.25 C/cm, at which point loss of cathode material became intolerable. Argon-xenon-CO 2 proved to be quenched as well as argon-hydrocarbons, but was limited by cathode damage. The MAC vertex chamber has operated at a distance of 4.6 cm from the e + e - interaction point at PEP for two years and has shown no aging effects

Method for automatic determination of soybean actual evapotranspiration under open top chambers (OTC) subjected to effects of water stress and air ozone concentration.

Science.gov (United States)

Rana, Gianfranco; Katerji, Nader; Mastrorilli, Marcello

2012-10-01

The present study describes an operational method, based on the Katerji et al. (Eur J Agron 33:218-230, 2010) model, for determining the daily evapotranspiration (ET) for soybean inside open top chambers (OTCs). It includes two functions, calculated day par day, making it possible to separately take into account the effects of concentrations of air ozone and plant water stress. This last function was calibrated in function of the daily values of actual water reserve in the soil. The input variables of the method are (a) the diurnal values of global radiation and temperature, usually measured routinely in a standard weather station; (b) the daily values of the AOT40 index accumulated (accumulated ozone over a threshold of 40 ppb during daylight hours, when global radiation exceeds 50 Wm(-2)) determined inside the OTC; and (c) the actual water reserve in the soil, at the beginning of the trial. The ensemble of these input variables can be automatable; thus, the proposed method could be applied in routine. The ability of the method to take into account contrasting conditions of ozone air concentration and water stress was evaluated over three successive years, for 513 days, in ten crop growth cycles, excluding the days employed to calibrate the method. Tests were carried out in several chambers for each year and take into account the intra- and inter-year variability of ET measured inside the OTCs. On the daily scale, the slope of the linear regression between the ET measured by the soil water balance and that calculated by the proposed method, under different water conditions, are 0.98 and 1.05 for the filtered and unfiltered (or enriched) OTCs with root mean square error (RMSE) equal to 0.77 and 1.07 mm, respectively. On the seasonal scale, the mean difference between measured and calculated ET is equal to +5% and +11% for the filtered and unfiltered OTCs, respectively. The ability of the proposed method to estimate the daily and seasonal ET inside the OTCs is

Integrated aeroelastic vibrator for fluid mixing in open microwells

Science.gov (United States)

Xia, H. M.; Jin, X.; Zhang, Y. Y.; Wu, J. W.; Zhang, J.; Wang, Z. P.

2018-01-01

Fluid mixing in micro-wells/chambers is required in a variety of biological and biochemical processes. However, mixing fluids of small volumes is usually difficult due to increased viscous effects. In this study, we propose a new method for mixing enhancement in microliter-scale open wells. A thin elastic diaphragm is used to seal the bottom of the mixing microwell, underneath which an air chamber connects an aeroelastic vibrator. Driven by an air flow, the vibrator produces self-excited vibrations and causes pressure oscillations in the air chamber. Then the elastic diaphragm is actuated to mix the fluids in the microwell. Two designs that respectively have one single well and 2  ×  2 wells were prototyped. Testing results show that for liquids with a volume ranging from 10-60 µl and viscosity ranging from 1-5 cP, complete mixing can be obtained within 5-20 s. Furthermore, the device is operable with an air micropump, and hence facilitating the miniaturization and integration of lab-on-a-chip and microbioreactor systems.

Acoustic-Levitation Chamber

Science.gov (United States)

Barmatz, M. B.; Granett, D.; Lee, M. C.

1984-01-01

Uncontaminated environments for highly-pure material processing provided within completely sealed levitation chamber that suspends particles by acoustic excitation. Technique ideally suited for material processing in low gravity environment of space.

Technology transference in soybean culture – COPACOL experience / Transferência de tecnologia para a cultura da soja – a experiência da COPACOL

Directory of Open Access Journals (Sweden)

Maria de Fátima Guimarães

2008-08-01

Full Text Available This paper analyzed the technology transfer methodology, the Training and Visit System (T&V, applied by Agroindustrial Cooperative of Consolata – COPACOL. The objective was to demonstrate that the continuous and holistic application of a technology transfer system may speed up the awareness and the adoption of these technologies by the farmers and result in positive outcomes for all actors and institutions involved in the process. The methodology of technology transfer analyzed, the T&V System, is already used by Embrapa Soybean, a branch of Brazilian Agricultural Research Corporation – EMBRAPA, Rural Extension and Technical Assistance Corporation - EMATER, Agronomic institute of Parana - IAPAR and Cooperative Organization of Parana – OCEPAR as partners. It was concluded that the T&V System may be an important tool for improvement of the validation and transfer of technologies generated by research institutions. In the COPACOL, the T&V contributed with the technological development of the technicians and farmers. It contributed also, with the growth of the profit obtained by the farmers who participated of the T&V as compared with the average growth obtained by the other farmers, members of the cooperative. Finally, it was observed that the time of adoption of new technologies was decreased with the application of the T&V System.Este trabalho analisou a metodologia Sistema de Treino e Visita (T&V aplicada pela Cooperativa Agroindustrial Consolata – COPACOL na transferência de tecnologia, tendo como objetivo mostrar que um processo de transferência de tecnologia, quando desenvolvido de forma contínua e sistêmica, pode dinamizar a chegada e adoção dessas tecnologias ao produtor rural com resultados positivos para todos os participantes do sistema. A análise focou o Sistema T&V, que é uma metodologia já utilizada pela EMBRAPA Soja, unidade da Empresa Brasileira de Pesquisa Agropecuária – EMBRAPA, em parceria com o Instituto

Polarity effects and apparent ion recombination in microionization chambers

Energy Technology Data Exchange (ETDEWEB)

Miller, Jessica R., E-mail: miller@humonc.wisc.edu [Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin 53705 and Department of Human Oncology, University of Wisconsin-Madison, Madison, Wisconsin 53792 (United States); Hooten, Brian D. [Standard Imaging, Middleton, Wisconsin 53562 (United States); Micka, John A.; DeWerd, Larry A. [Department of Medical Physics, University of Wisconsin-Madison, Madison, Wisconsin 53705 (United States)

2016-05-15

Purpose: Microchambers demonstrate anomalous voltage-dependent polarity effects. Existing polarity and ion recombination correction factors do not account for these effects. As a result, many commercial microchamber models do not meet the specification of a reference-class ionization chamber as defined by the American Association of Physicists in Medicine. The purpose of this investigation is to determine the cause of these voltage-dependent polarity effects. Methods: A series of microchamber prototypes were produced to isolate the source of the voltage-dependent polarity effects. Parameters including ionization-chamber collecting-volume size, stem and cable irradiation, chamber assembly, contaminants, high-Z materials, and individual chamber components were investigated. Measurements were performed with electrodes coated with graphite to isolate electrode conductivity. Chamber response was measured as the potential bias of the guard electrode was altered with respect to the collecting electrode, through the integration of additional power supplies. Ionization chamber models were also simulated using COMSOL Multiphysics software to investigate the effect of a potential difference between electrodes on electric field lines and collecting volume definition. Results: Investigations with microchamber prototypes demonstrated that the significant source of the voltage-dependent polarity effects was a potential difference between the guard and collecting electrodes of the chambers. The voltage-dependent polarity effects for each prototype were primarily isolated to either the guard or collecting electrode. Polarity effects were reduced by coating the isolated electrode with a conductive layer of graphite. Polarity effects were increased by introducing a potential difference between the electrodes. COMSOL simulations further demonstrated that for a given potential difference between electrodes, the collecting volume of the chamber changed as the applied voltage was altered

Open BPS wall crossing and M-theory

International Nuclear Information System (INIS)

Aganagic, Mina; Yamazaki, Masahito

2010-01-01

Consider the degeneracies of BPS bound states of one D6-brane wrapping Calabi-Yau X with D0-branes and D2-branes. When we include D4-branes wrapping Lagrangian cycles in addition, D2-branes can end on them. These give rise to new bound states in the d=2, N=(2,2) theory of the D4-branes. We call these 'open' BPS states, in contrast to closed BPS states that arise from D-branes without boundaries. Lifting this to M-theory, we show that the generating function is captured by free Fock space spanned by M2-brane particles ending on M5-branes wrapping the Lagrangian. This implies that the open BPS bound states are counted by the square of the open topological string partition function on X, reduced to the corresponding chamber. Our results give new predictions for open BPS invariants and their wall crossing phenomena when we change the open and closed string moduli. We relate our results to the work of Cecotti and Vafa on wall crossing in the two-dimensional N=(2,2) theories. The findings from the crystal melting model for the open BPS invariants proposed recently fit well with the M-theory predictions.

Repair of isolated double-chambered right ventricle | El Kouache ...

African Journals Online (AJOL)

The finding of a double-chambered right ventricle (DCRV) is exceptionally rare as an isolated anomaly. It is a congenital cardiac anomaly in which the right ventricle is separated into two chambers, a proximal highpressure chamber and a distal low-pressure chamber, by anomalous muscles or fibrous tissues in the right ...

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).

Tecnologia e informação em saúde: modelo de ensino-aprendizagem transdisciplinar

Directory of Open Access Journals (Sweden)

Maria Cristiane Barbosa Galvão

Full Text Available Considerando conceitos básicos sobre tecnologia, informação e saúde; a observação de propostas curriculares; a análise de softwares e hardwares destinados ao campo da saúde, e a análise crítica da literatura, esta pesquisa focou-se na questão de como formar profissionais do campo da informação e do campo da informática que possam melhor solucionar as problemáticas relacionadas ao contexto da saúde. Para tanto, elaborou-se como hipótese inicial um modelo de ensino-aprendizagem transdisciplinar que abarca quatro aspectos: interação entre docentes e discentes de diferentes áreas; integração entre o contexto externo e o contexto da instituição educacional; condições institucionais; sistematização de um projeto de ensino-aprendizagem. Para analisar tal hipótese, adotou-se um método qualitativo, qual seja, a pesquisa-ação, durante o período de ano, no qual foram ofertados dois cursos, com duração de 60 horas cada um e participação de 35 alunos. Como resultado da pesquisa, o modelo proposto se mostrou adequado para o ensino-aprendizagem em tecnologia e informação em saúde, sendo enfatizados parâmetros do contexto educacional transdisciplinar, como a competência linguística, a harmonizacao conceitual, os padrões éticos, a linguagem dos textos selecionados, e a relação entre as problemáticas discutidas no contexto externo e interno.

Tecnologia e educação: algumas considerações sobre o discurso pedagógico contemporâneo

Directory of Open Access Journals (Sweden)

Joana Peixoto

2012-03-01

Full Text Available O presente artigo pretende analisar os fundamentos do discurso predominante sobre as relações entre as tecnologias e a educação, tomando por base um estado da arte realizado sobre os usos do computador na educação escolar, no período de 1997 a 2007 no Brasil. Nesse estado da arte foram encontrados 107 trabalhos relacionados a essa temática e a referência a 1.330 autores. A análise destes trabalhos conduz à reflexão que busca apoio teórico em um descolamento dos discursos habituais sobre o uso das tecnologias em educação: tanto aqueles que se baseiam nas prescrições normativas para a incorporação dos instrumentos tecnológicos (visão instrumental, como aqueles que impõem as TIC como uma fatalidade no seio das escolas (determinismo tecnológico. O corpus total foi objeto de análise de conteúdo, indicando as categorias: o computador como recurso didáticopedagógico e o computador como recurso político-pedagógico.

Study on target interactions in emulsion chamber - Brasil-Japan emulsion chamber collaboration

Science.gov (United States)

Ballester, M.; Santos, C.; Bellandi Filho, J.; Chinellato, J. A.; Dobrigkeit, C.; Lattes, C. M. G.; Marques, A.; Menon, M. J.; Navia, C. E.; Sawayanagi, K.

Experimental results are presented from observations of 80 target nuclear interactions where the total gamma-ray energy is greater than or equal to 20 TeV. Evidence is presented for the existence of two types of interactions; the interpretation is given on the basis of a fire-ball model. Two-story emulsion chambers exposed at Mount Chacaltaya, in Bolivia (5,220 m above sea level), are used. Gamma rays from nuclear interactions in the target layer of petroleum pitch (1/3 of the nuclear mean free path in thickness) are detected through observations of the electron showers generated by them in the lower chamber

Climate chamber for environmentally controlled laboratory airflow experiments.

Science.gov (United States)

Even-Tzur, Nurit; Zaretsky, Uri; Grinberg, Orly; Davidovich, Tomer; Kloog, Yoel; Wolf, Michael; Elad, David

2010-01-01

Climate chambers have been widely used in in vitro and in vivo studies which require controlled environmental temperature and humidity conditions. This article describes a new desktop climate chamber that was developed for application of respiratory airflows on cultured nasal epithelial cells (NEC) under controlled temperature and humidity conditions. Flow experiments were performed by connecting the climate chamber to an airflow generator via a flow chamber with cultured NEC. Experiments at two controlled climate conditions, 25 degrees C and 40% relative humidity (RH) and 37 degrees C and 80%RH, were conducted to study mucin secretion from the cultures inresponse to the flow. The new climate chamber is a relatively simple and inexpensive apparatus which can easily be connected to any flow system for climate controlled flow experiments. This chamber can be easily adjusted to various in vitro experiments, as well as to clinical studies with animals or human subjects which require controlled climate conditions.

Investigation of a multiwire proportional chamber

International Nuclear Information System (INIS)

Konijn, J.

1976-01-01

The article discusses some aspects of a prototype multiwire proportional chamber for electron detection located at IKO in Amsterdam, i.e. voltage, counting rates, noise and gas mixture (argon, ethylene bromide). The efficiency and performance of the chamber have been investigated and an error analysis is given

Triangular tube proportional wire chamber system

Energy Technology Data Exchange (ETDEWEB)

Badtke, D H; Bakken, J A; Barnett, B A; Blumenfeld, B J; Chien, C Y; Madansky, L; Matthews, J A.J.; Pevsner, A; Spangler, W J [Johns Hopkins Univ., Baltimore, MD (USA); Lee, K L [California Univ., Berkeley (USA). Lawrence Berkeley Lab.

1981-10-15

We report on the characteristics of the proportional tube chamber system which has been constructed for muon identification in the PEP-4 experiment at SLAC. The mechanical and electrical properties of the extruded aluminum triangular tubes allow these detectors to be used as crude drift chambers.

Ensino de projeto arquitetônico com a inclusão de novas tecnologias: uma abordagem pedagógica contemporânea

Directory of Open Access Journals (Sweden)

Maycon Sedrez

2014-09-01

Full Text Available A adoção de novas tecnologias no processo de projeto tem desempenhado um papel fundamental na Arquitetura contemporânea. Isso tem instigado os professores a buscar conhecer os processos cognitivos envolvidos na aprendizagem de projeto. Este artigo é um estudo de caso da disciplina Responsive Architecture, lecionada pela arquiteta Anne Save de Beaurecueil na Unicamp. A disciplina inclui uma intensa utilização de meios computacionais de geração, representação e modelagem do projeto. O objetivo deste artigo é descrever o método utilizado nessa disciplina, a partir da observação das atividades, contextualizando-o no cenário das novas práticas arquitetônicas e de seu impacto no ensino, em escolas de excelência internacional. Por fim, verificam-se similaridades do método para inclusão de novas tecnologias com práticas pedagógicas atuais no ensino de Arquitetura.

The Mark III vertex chamber and prototype test results

International Nuclear Information System (INIS)

Grab, C.

1987-07-01

A vertex chamber has been constructed for use in the Mark III experiment. The chamber is positioned inside the current main drift chamber and will be used to trigger data collection, to aid in vertex reconstruction, and to improve the momentum resolution. This paper discusses the chamber's construction and performance and tests of the prototype

The OPAL vertex drift chamber

International Nuclear Information System (INIS)

Carter, J.R.; Elcombe, P.A.; Hill, J.C.; Roach, C.M.; Armitage, J.C.; Carnegie, R.K.; Estabrooks, P.; Hemingway, R.; Karlen, D.; McPherson, A.; Pinfold, J.; Roney, J.M.; Routenburg, P.; Waterhouse, J.; Hargrove, C.K.; Klem, D.; Oakham, F.G.; Carter, A.A.; Jones, R.W.L.; Lasota, M.M.B.; Lloyd, S.L.; Pritchard, T.W.; Wyatt, T.R.

1990-01-01

A high precision vertex drift chamber has been installed in the OPAL experiment at LEP. The design of the chamber and the associated readout electronics is described. The performance of the system has been studied using cosmic ray muons and the results of these studies are presented. A space resolution of 50 μm in the drift direction is obtained using the OPAL central detector gas mixture at 4 bar. (orig.)

DESENVOLVIMENTO DE UMA METODOLOGIA DE INTEGRAÇÃO DA TECNOLOGIA RFID PARA A CADEIA DE SUPRIMENTOS DAS EMPRESAS MONTADORAS DE MICROCOMPUTADORES NO PÓLO DE INFORMÁTICA DE ILHÉUS/BA

OpenAIRE

Passos, Francisco Uchoa; Araújo Filho, Frederico Wergne de Castro; Travassos Júnior, Xisto Lucas

2013-01-01

Este artigo tem como objetivo fazer uma proposta de aplicação da tecnologia RFID – Radio Frequency Identification (Identificação por Radiofreqüência), em empresas montadoras de microcomputadores, para o controle de estoque e rastreabilidade de insumos/produtos. Para justificar a vantagem da aplicação da tecnologia RFID, utilizou-se a Análise dos Modos de Falha e seus Efeitos (FMEA – Failure Modes and Effect Analysis) com foco específico em FMEA de Processo. A proposta de integração da tecnolo...

Chamber for Aerosol Deposition of Bioparticles

Science.gov (United States)

Kern, Roger; Kirschner, Larry

2008-01-01

Laboratory apparatus is depicted that is a chamber for aerosol deposition of bioparticles on surfaces of test coupons. It is designed for primary use in inoculating both flat and three-dimensional objects with approximately reproducible, uniform dispersions of bacterial spores of the genus Bacillus so that the objects could be used as standards for removal of the spores by quantitative surface sampling and/or cleaning processes. The apparatus is also designed for deposition of particles other than bacterial spores, including fungal spores, viruses, bacteriophages, and standard micron-sized beads. The novelty of the apparatus lies in the combination of a controllable nebulization system with a settling chamber large enough to contain a significant number of test coupons. Several companies market other nebulizer systems, but none are known to include chambers for deposition of bioparticles to mimic the natural fallout of bioparticles. The nebulization system is an expanded and improved version of commercially available aerosol generators that include nebulizers and drying columns. In comparison with a typical commercial aerosol generator, this system includes additional, higher-resolution flowmeters and an additional pressure regulator. Also, unlike a typical commercial aerosol generator, it includes stopcocks for separately controlling flows of gases to the nebulizer and drying column. To maximize the degree of uniformity of dispersion of bioaerosol, the chamber is shaped as an axisymmetrical cylinder and the aerosol generator is positioned centrally within the chamber and aimed upward like a fountain. In order to minimize electric charge associated with the aerosol particles, the drying column is made of aluminum, the drying column is in direct contact with an aluminum base plate, and three equally spaced Po-210 antistatic strips are located at the exit end of the drying column. The sides and top of the chamber are made of an acrylic polymer; to prevent

Construction of radon/radon daughter calibraton chamber

International Nuclear Information System (INIS)

Fry, J.; Gan, T.H.; Leach, V.A.; Saddlier, J.; Solomon, S.B.; Tam, K.K.; Travis, E.; Wykes, P.

1983-01-01

The radon/radon daughter test chamber is a copper lined room 1.65x1.75x2.75m with an effective volume of 8000 litres. The air residence time is controlled by circulating the air in the chamber through absolute filters which remove 99.9% of particulates. Radon is drawn into the chamber from a 17 μCi 226 RaCl source using the pressure differential across the blowers (<3 psi)

30 CFR 56.7807 - Flushing the combustion chamber.

Science.gov (United States)

2010-07-01

... 30 Mineral Resources 1 2010-07-01 2010-07-01 false Flushing the combustion chamber. 56.7807 Section 56.7807 Mineral Resources MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR METAL AND... Rotary Jet Piercing Rotary Jet Piercing § 56.7807 Flushing the combustion chamber. The combustion chamber...

Inovação, tecnologias de informação e comunicação e processos disruptivos Innovación, tecnologias de información y comunicación y processos disruptivos

Directory of Open Access Journals (Sweden)

Maria Jose Vicentini Jorente

2012-10-01

Full Text Available A Inovação e seus processos, em especial no campo tecnológico, são de interesse da Ciência da Informação como ciência do humano, pois determinam o estabelecimento de novos hábitos, indicadores socioculturais relevantes para a compreensão da história das culturas. Este artigo reflete sobre as problemáticas: se e como as Tecnologias de Informação e Comunicação tem impactado a vida dos nativos digitais; se o indivíduo comum está preparado para vivenciar criteriosamente o entorno tecnológico; como o sistema vigente poderá preparar gerações futuras de profissionais; e como os adultos que cresceram no século XX, em uma sociedade analógica podem preparar os jovens do século XXI para uma realidade digital, extensivamente diferente da deles. À medida que a sofisticação das tecnologias avança, a sociedade tem que continuamente revisar a maneira como se apropria da informação para se ajustar a essas mudanças. Quanto à relevância das metodologias que conduzem para ações inovadoras disruptivas em realidades hibridas como a brasileira, com nichos de pobreza e prosperidade, pode-se dizer que é em países pobres ou com diferenças sociais tão evidentes como as do Brasil onde se denota a necessidade de mudança de paradigma sócio tecnocultural e de uma ação inovadora.

Recent developments in wire chamber tracking at SSC

International Nuclear Information System (INIS)

Ogren, H.

1990-01-01

All of the major SSC proposed detectors use wire chambers in their tracking systems. The feasibility of wire chambers in an SSC detector has now been established by a number of groups planning detectors at SSC. The major advances during the past year in understanding straw tube drift chambers are presented and several innovations in gaseous wire chambers are discussed. The R and D section will concentrate on progress in drift cell design, electronics and signal processing, and engineering aspects of the tracking designs

Tecnologias de informação e comunicação (TICs) e democracia

OpenAIRE

Viana, Fernanda Martins

2011-01-01

A consideração de que as Tecnologias da Informação e Comunicação (TICs) promovem transformações na sociedade não permite conclusões de que tais mudanças são necessariamente positivas. Ao contrário, é justificado o aumento no número de estudos na área, que buscam identificar a medida dessas modificações, suas vantagens, desvantagens e sua apropriação pelas formas de organização já existentes na sociedade. Entretanto, é ponto pacífico que todas essas alterações indicam um novo escopo de relaçõe...

Method of controlling weld chamber purge and cover gas atmosphere

International Nuclear Information System (INIS)

Yeo, D.

1992-01-01

A method of controlling the gas atmosphere in a welding chamber includes detecting the absence of a fuel rod from the welding chamber and, in response thereto, initiating the supplying of a flow of argon gas to the chamber to purge air therefrom. Further, the method includes detecting the entry of a fuel rod in the welding chamber and, in response thereto, terminating the supplying of the flow of argon gas to the chamber and initiating the supplying of a flow of helium gas to the chamber to purge argon gas therefrom and displace the argon gas in the chamber. Also, the method includes detecting the withdrawal of the fuel rod from the welding chamber and, in response thereto, terminating the supplying of the flow of helium gas to the chamber and initiating the supplying of argon to the chamber to purge the air therefrom. The method also includes detecting the initiation of a weld cycle and, in response thereto, momentarily supplying a flow of argon gas to the welding electrode tip for initiating the welding arc. (Author)

ANÁLISE DO PROCESSO DE TRANSFERÊNCIA DE TECNOLOGIA: O CASO DA UEG ARAUCÁRIA

Directory of Open Access Journals (Sweden)

Fabricio Baron Mussi

2016-09-01

Full Text Available As usinas termelétricas representam uma alternativa para o suprimento de energia elétrica no Brasil. Diferem das hidrelétricas por sua complexidade e da necessidade de uso do sistema de controle distribuído (DCS para seu funcionamento. O presente trabalho tem como objetivo analisar um caso de aquisição de um novo sistema DCS, implicando na transferência de tecnologia de um fornecedor internacional. O caso abrange a participação de quatro organizações, focando-se no papel de um instituto de pesquisa na intermediação do processo de transferência de tecnologia. Observa-se que, do ponto de vista técnico, ocorreram às mudanças necessárias para o funcionamento do novo DCS, bem como o registro documental de todo o processo. Dentre as barreiras ao projeto, destacam-se a complexidade do ambiente multicultural, as negociações, as necessidades de adequação à legislação brasileira, a logística de materiais e a necessidade de conciliar as operações técnicas com as demandas de geração de energia. Por fim, não obstante os esforços despendidos para gestão do conhecimento gerado, ainda é evidente a dependência tecnológica de empresas estrangeiras no tocante a gestão do complexo tecnológico que os sistemas supervisórios das usinas termelétricas envolvem.

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.

Methane emission estimates using chamber and tracer release experiments for a municipal waste water treatment plant

Science.gov (United States)

Yver Kwok, C. E.; Müller, D.; Caldow, C.; Lebègue, B.; Mønster, J. G.; Rella, C. W.; Scheutz, C.; Schmidt, M.; Ramonet, M.; Warneke, T.; Broquet, G.; Ciais, P.

2015-07-01

This study presents two methods for estimating methane emissions from a waste water treatment plant (WWTP) along with results from a measurement campaign at a WWTP in Valence, France. These methods, chamber measurements and tracer release, rely on Fourier transform infrared spectroscopy and cavity ring-down spectroscopy instruments. We show that the tracer release method is suitable for quantifying facility- and some process-scale emissions, while the chamber measurements provide insight into individual process emissions. Uncertainties for the two methods are described and discussed. Applying the methods to CH4 emissions of the WWTP, we confirm that the open basins are not a major source of CH4 on the WWTP (about 10 % of the total emissions), but that the pretreatment and sludge treatment are the main emitters. Overall, the waste water treatment plant is representative of an average French WWTP.

Optical spark chamber

CERN Multimedia

CERN PhotoLab

1971-01-01

An optical spark chamber developed for use in the Omega spectrometer. On the left the supporting frame is exceptionally thin to allow low momentum particles to escape and be detected outside the magnetic field.

The Honeycomb Strip Chamber

International Nuclear Information System (INIS)

Graaf, Harry van der; Buskens, Joop; Rewiersma, Paul; Koenig, Adriaan; Wijnen, Thei

1991-06-01

The Honeycomb Strip Chamber (HSC) is a new position sensitive detector. It consists of a stack of folded foils, forming a rigid honeycomb structure. In the centre of each hexagonal cell a wire is strung. Conducting strips on the foils, perpendicular to the wires, pick up the induced avalanche charge. Test results of a prototype show that processing the signals form three adjacent strips nearest to the track gives a spatial resolution better than 64 μm for perpendicular incident tracks. The chamber performance is only slightly affected by a magnetic field. (author). 25 refs.; 21 figs

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.

Association of biometric factors with anterior chamber angle widening and intraocular pressure reduction after uneventful phacoemulsification for cataract.

Science.gov (United States)

Huang, Guofu; Gonzalez, Eduardo; Lee, Roland; Chen, Yi-Chun; He, Mingguang; Lin, Shan C

2012-01-01

To evaluate anterior chamber biometric factors associated with the degree of angle widening and intraocular pressure (IOP) reduction after phacoemulsification. University of California, San Francisco, California, USA. Case series. Anterior chamber parameters obtained by anterior segment coherence tomography were compared preoperatively and 3 months postoperatively. Measurements included the angle opening distance 500 μm anterior to the scleral spur (AOD500), trabecular-iris space area 500 μm from the scleral spur (TISA500), iris curvature (I-Curv), anterior chamber angle (ACA), trabecular-iris space area, anterior chamber volume, anterior chamber width, and lens vault (LV). The study enrolled 73 eyes. The mean patient age was 77.45 years ± 7.84 (SD); 65.75% of patients were women. From preoperatively to 3 months postoperatively, the mean AOD500 increased significantly (0.254 ± 0.105 to 0.433 ± 0.108 mm) and the mean IOP decreased significantly (14.97 ± 3.35 to 12.62 ± 3.37 mm Hg) (P<.001). The reduction in IOP was correlated with the increase in AOD500 (r = 0.240, P=.041) and preoperative LV (r = 0.235, P=.045). After adjusting for related factors, AOD500 widening was positively correlated with LV (β = 0.458, P=.044) and I-Curv (β = 0.235, P=.043) and negatively correlated with preoperative TISA500 (β = -0.269, P=.025) and ACA (β = -0.919, P=.027). Surgically induced AOD widening was significantly correlated with anterior chamber biometric factors. Preoperative LV appears to be a significant factor in angle widening and IOP reduction after phacoemulsification. Copyright © 2011 ASCRS and ESCRS. Published by Elsevier Inc. All rights reserved.

Simulated Field Trials Using an Indoor Aerosol Test Chamber

National Research Council Canada - National Science Library

Semler, D. D; Roth, A. P; Semler, K. A; Nolan, P. M

2004-01-01

.... In this method, the aerosol chamber control software manipulates circulation fan speeds, chamber vacuum and agent spray times to produce a simulated dynamic cloud within the aerosol test chamber...

Simulated Field Trials Using An Indoor Aerosol Test Chamber

National Research Council Canada - National Science Library

Semler, D. D; Roth, A. P; Semler, K. A; Nolan, P. M

2004-01-01

.... In this method, the aerosol chamber control software manipulates circulation fan speeds, chamber vacuum and agent spray times to produce a simulated dynamic cloud within the aerosol test chamber...

Equipment for handling ionization chamber

International Nuclear Information System (INIS)

Altmann, J.

1988-01-01

The device consists of an ionization channel with an ionization chamber, of a support ring, axial and radial bearings, a sleeve, a screw gear and an electric motor. The ionization chamber is freely placed on the bottom of the ionization channel. The bottom part of the channel deviates from the vertical axis. The support ring propped against the axial bearing in the sleeve is firmly fixed to the top part of the ionization channel. The sleeve is fixed to the reactor lid. Its bottom part is provided with a recess for the radial bearing which is propped against a screw wheel firmly connected to the ionization channel. In measuring neutron flux, the screw wheel is rotated by the motor, thus rotating the whole ionization channel such that the ionization chamber is displaced into the reactor core.(J.B.). 1 fig

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.

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.

Results from the MAC Vertex chamber

International Nuclear Information System (INIS)

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 μm in use for physics analysis with the MAC detector. The B-lifetime result obtained with this chamber is discussed

Measurement and Compensation of BPM Chamber Motion in HLS

Science.gov (United States)

Li, J. W.; Sun, B. G.; Cao, Y.; Xu, H. L.; Lu, P.; Li, C.; Xuan, K.; Wang, J. G.

2010-06-01

Significant horizontal drifts in the beam orbit in the storage ring of HLS (Hefei Light Source) have been seen for many years. What leads to the motion of Beam Position Monitor (BPM) chamber is thermal expansion mainly caused by the synchrotron light. To monitor the BPM chamber motions for all BPMs, a BPM chamber motion measurement system is built in real-time. The raster gauges are used to measure the displacements. The results distinctly show the relation between the BPM chamber motion and the beam current. To suppress the effect of BPM chamber motion, a compensation strategy is implemented at HLS. The horizontal drifts of beam orbit have been really suppressed within 20μm without the compensation of BPM chamber motion in the runtime.