Vacuum Chamber
Mostrando 13-24 de 42 artigos, teses e dissertações.
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13. Construção de uma armadilha magneto-ótica para aplicações em informação quântica e física atômica / Construction of a Magnet-Optical Trap for Aplications at Quantum Information and Atomic Physics
We built a magneto-optical trap (MOT) for rubidium as a first step for the trapping of a cloud of cold atoms in a periodic potential formed by light beams. This system will be used for experiments in atom physics, with possible applications in quantum information. A MOT is necessary to avoid the problems imposed by the thermal agitation of the atoms to the m
Publicado em: 2009
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14. Avaliação dos efeitos da injeção de gás na câmara de vácuo do modelo físico de um desgaseificador RH
Steels with low concentrations of nitrogen, hydrogen and carbon have in large demand lately. The RH process is a secondary refining process that can simultaneously attain significant levels of removal of these interstitial elements from liquid steel. In the RH process, the melt circulation rate plays a very important role in determining productivity of the e
Publicado em: 2008
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15. Crescimento de fibras de LiYF4 dopadas com Nd3+ e Er3+ para aplicações em lasers de estado sólido / SINGLE FIBER CRYSTAL GROWTH OF Nd3+ AND Er3+- DOPED LiYF4 FOR SOLID STATE LASER APPLICATIONS
In the present work, we studied the growth of single crystal fibers of LiYF4 (YLF) doped with Er3+ or Nd3+ by the resistive micro-pulling-down (-PD) tecnhique. A new method for crucible preparation was developed to improve the growth process. The use of better-built crucibles allows their use in more than one experiment, increasing the process reproducibilit
Publicado em: 2008
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16. Listeria spp. e L. monocytogenes em carne bovina refrigerada e embalada a vácuo, equipamentos e ambiente de matadouros frigoríficos / Listeria spp. and L. monocytogenes in vacuum-packed chilled beef, equipment, environment of slaughterhouses
Intending to stipulate the parcel of Listeria spp. and L. monocytogenes in several sources, using the PCR techicic, 360 samples were analyzed in the period between november 2006 and february 2008, proceeding from 25 commercial abattoirs of five companies all licensed to export from some Brazilian States. Primers U1/LI1 for Listeria spp. and LM1/LM2 and LL5/L
Publicado em: 2008
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17. Determination fo the configuration of excited Alfvén waves in tokamak TCABR / Determinação da configuração de ondas de alfvén excitadas no tokamak TCABR
In order to enhance the efficiency of the TCABRs Alfvén waves heating system, called AWES - Alfvén Waves Excitement System a diagnostics for determining the radio-frequency power applied to the plasma and a processing circuit for the magnetic coil system was built, characterized, installed and put into operation. The RF diagnostics system was designed to d
Publicado em: 2007
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18. Sistemas de controle difuso com escalonamento de ganhos parametrizado pela referência (FRGS) / Fuzzy reference gain-scheduling (FRGS) control systems
Uma nova classe de sistemas de controle difuso não-lineares e adaptativos denominada sistemas de controle difuso com escalonamento de ganhos indexados pela referência (FRGS), que combina as características adaptativas de controladores com escalonamento de ganhos e as características não-lineares do método de controladores difusos (fuzzy), a proposta. A
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/06/2006
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19. Hollow cathode magnetron deposition of AlN thin films: crystalline structure and morphology
A new dc hollow cathode plasma source has been assembled whith a conventional planar magnetron cathode used together with another plane cathode plate to form a hollow cathode cavity. The system comprises two cathode plates of aluminium separated by a distance d, one of them acting as target of the magnetron cathode, the other being an ordinary plate. The dis
Brazilian Journal of Physics. Publicado em: 2006-06
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20. Avaliação da Limpidez do Aço Líquido Através da Modelagem Matemática do Desgaseificador RH da Companhia Siderúrgica de Tubarão - CST
In order to comply with an increasing market for high quality steels, specially steels for automobile applications, CST Companhia Siderúrgica de Tubarão has acquired in 1998 its RH degasification unit. As a production expansion up to 7.5 million tons of crude steel per year is scheduled, a 2nd RH unit has been commissioned. The RH process is based upon the
Publicado em: 2006
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21. Sistemas de controle difuso com escalonamento de ganhos parametrizado pela referência (FRGS) / Fuzzy reference gain-scheduling (FRGS) control systems
Uma nova classe de sistemas de controle difuso não-lineares e adaptativos denominada sistemas de controle difuso com escalonamento de ganhos indexados pela referência (FRGS), que combina as características adaptativas de controladores com escalonamento de ganhos e as características não-lineares do método de controladores difusos (fuzzy), a proposta. A
Publicado em: 2006
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22. Proton CT setup at CV-28 of IEN/CNEN
Although the idea of proton Computed Tomography (pCT) is not new, it is currently not available. It is still unknown if the image quality of pCT is sufficient for localizing tumors and if the accuracy of proton range calculations surpass that of X-ray CT based range calculations without significantly increasing the patient exposure. The spatial resolution of
Brazilian Journal of Physics. Publicado em: 2005-09
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23. Decomposição catalítica da hidrazina sobre irídio suportado em compósitos à base de nanofibras de carbono para propulsão espacial: testes em condições reais
The aim of this work is to present the catalytic performance of iridium supported on carbon nanofibers with macroscopic shaping in a 2 N hydrazine microthruster placed inside a vacuum chamber in order to reproduce real-life conditions. The performances obtained are compared to those of the commercial catalyst Shell 405. The carbon-nanofiber based catalyst sh
Química Nova. Publicado em: 2005-02
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24. Desenvolvimento experimental de uma camara para medida de emissão de eletrons por catodos frios / Development of a vacuum set-up for the measurement of cold cathode field electron emission
Foi desenvolvida uma câmara de vácuo para estudo das propriedades elétricas de emissão de elétrons por catodos frios de vários materiais de interesse tecnológico, por exemplo, diamante dopado, filmes de carbono diamantífero e silício. Na parte experimental realizamos um sistema de alto vácuo (bomba mecânica mais a bomba difusora), um sistema de po
Publicado em: 2005