Low Temperature Plasmas
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Desdoblamiento de la transformación martensítica en un acero F82H de activación neutrónica reducida
ABSTRACT One of the most promising solutions to global energy supply is nuclear fusion. This process, which is implemented in nuclear fusion reactors (from which one of the first designs was the Tokamak), involves deuterium-tritium plasmas at very high temperature, confined in vacuum chambers of toroidal shape under the influence of strong magnetic fields. T
Matéria (Rio J.). Publicado em: 19/07/2018
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2. Study of the interaction of the electric arc with cold copper cathode in air and nitrogen using the thermo-spectroscopic diagnostic technique / Estudo da interação de arcos elétricos com catodo frio de cobre para ar e nitrogenio utilizando a tecnica de diagnostico termo-espectroscopica
Uma nova técnica de diagnóstico, denominada termo-espectroscópica, foi introduzida neste trabalho para estudo da interação do arco elétrico com o catodo frio de cobre numa instalação coaxial magnética, com catodo não-refrigerado, operando em gases plasmagênicos ar e nitrogênio. A técnica foi aplicada ao estudo da velocidade de rotação da manch
Publicado em: 2008
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3. Study of plasma fluorination variables for deposition and growth of partially fluorinated polymer on PMMA films / Estudo das variaveis de fluoração via plasma na deposição e crescimento de polimero parcialmente fluorado sobre filmes de PMMA
Dispositivos ópticos poliméricos têm sido promissores para aplicação em comunicações, principalmente na utilização em redes de curta distância devido ao fácil processamento e baixo custo quando comparado aos materiais ópticos fabricados com sílica. Na fabricação de um dispositivo óptico é imprescindível que o índice de refração do núcle
Publicado em: 2006
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4. Quantum uncertainty in weakly non-ideal astrophysical plasma
Galitskii and Yakimets showed that in dense or low temperature plasma, due to quantum uncertainty effect, the particle distribution function over momenta acquires a power-like tail even under conditions of thermodynamic equilibrium. We show that in weakly non-ideal plasmas, like the solar interior, both non-extensivity and quantum uncertainty should be taken
Brazilian Journal of Physics. Publicado em: 2005-06
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5. Ignitor: physics and progress towards ignition
Thermonuclear ignition condition for deuterium-tritium plasmas can be achieved in compact, high magnetic field devices such as Ignitor. The main scientific goals, the underlying physics basis, and the most relevant engineering solutions of this experiment are described. Burning plasma conditions can be reached either with ohmic heating only or with small amo
Brazilian Journal of Physics. Publicado em: 2004-12
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6. Modificação da superficie de filmes de PMMA via polimerização por plasma de CHF3 / Surface modification of PMMA films by CHF3 plasma polymerization
Polymeric materials are alternative to inorganic materials for production of optical devices as waveguides and optical fibers (POF) for light transmission. This because the molecular structure of polymers can be versatile modeled, giving materials with different refractive indices, low cost and easy processing. These devices are basically consisted by core w
Publicado em: 2004
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7. A new double probe system for studies of non-uniform plasmas
A theoretical and experimental study was developed about the applicability of a double probe system consisting of two directional Langmuir probes, both probes being located separately in a plasma column. The current- voltage characteristic of the double probe was obtained considering a plasma with a drifting maxwellian electron velocity distribution function
Brazilian Journal of Physics. Publicado em: 2003-12
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8. New driving parameters for diamond deposition reactors: pulsed mode versus continuous mode
Experimental investigation and modeling of pulsed H2/CH4 plasmas used for diamond deposition are presented. Two plasma configurations are studied : a 2.45 GHz microwave cavity configuration and a 915 MHz surface-wave configuration. Time-resolved measurements of the gas temperature determined from the Doppler broadening of the Balmer Ha line, of the H-atom re
Materials Research. Publicado em: 2003-01
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9. Ordem e caos em plasmas magnetizados
The objective of this thesis is to present a clear understanding of some important nonlinear phenomena that are common in space and laboratory plasmas. Specifically,the present analytical and numerical studies have focused on the properties of electromagnetic turbulence as well as associated coherent structures and chaotic behaviors in a multi-component magn
Publicado em: 1999
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10. Excitation of Metastable Levels in Low Density Nebular Plasmas: [SII] and [ArIV]
Diagnostics of low density nebular plasma by means of its forbidden line spectrum require not only a knowledge of certain intensity ratios as a function of its density and temperature but also a knowledge of the occupation numbers of relevant ionic levels. We present the necessary data for important levels of ionized sulfur and triply ionized argon.