16 resultados para Soviet Union. Sovet Ministrov

em Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho"


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Edgard Morin (Auto-critique), Annie Kriegel (Ce que j'ai cru comprendre) e Claude Roy (Moi, je) percorrem passo a passo, desde a infância, as trilhas que o levaram ao PCF; os três participaram da resistência anti-nazista ao lado da União Soviética, ocasião da entrada em comunismo. Seguem-se as descrições de uma lenta asfixia moral em que os depoimentos fazem perceber como a rede das necessidades internas à subjetividade. Este artigo, analisando as autobiografias de três intelectuais franceses no momento em que dão criticamente conta de seu passado comunista procura apreender a figura histórica toda negativa da relação a si nas assim chamadas contra-sociedades comunistas durante o período stalinista.

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Examines the influence of class relations and political, ideological and structural shapes on international relations. Detente policy between the great world powers developed as a function of the basic interests of United States and Soviet Union. The analysis of underdeveloped countries' international policies is in accordance with processes of capitalistic accumulation and international labour division. -from English summary

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Electric propulsion is now a succeful method for primary propulsion of deep space long duration missions and for geosyncronous satellite attitude control. Closed Drift Thruster, so called Hall Thruster or SPT (Stationary Plasma Thruster), was primarily conceived in USSR (the ancient Soviet Union) and, since then, it has been developed by space agencies, space research institutes and industries in several countries such as France, USA, Israel, Russian Federation and Brazil. In this work we present the main features of the Permanent Magnet Hall Thruster (PMHT) developed at the Plasma Laboratory of the University of Brasilia. The idea of using an array of permanent magnets, instead of an electromagnet, to produce a radial magnetic field inside the plasma channel of the thruster is very significant. It allows the development of a Hall Thruster with power consumption low enough to be used in small and medium size satellites. Description of a new vacuum chamber used to test the second prototype of the PMHT (PHALL II) will be given. PHALL II has an aluminum plasma chamber and is smaller with 15 cm diameter and will contain rare earth magnets. We will show plasma density and temperature space profiles inside and outside the thruster channel. Ion temperature measurements based on Doppler broadening of spectral lines and ion energy measurements are also shown. Based on the measured plasma parameters we constructed an aptitude figure of the PMHT. It contains the specific impulse, total thrust, propellant flow rate and power consumption necessary for orbit raising of satellites. Based on previous studies of geosyncronous satellite orbit positioning we perform numerical simulations of satellite orbit raising from an altitude of 700 km to 36000 km using a PMHT operating in the 100 mN - 500 mN thrust range. In order to perform these calculations integration techniques were used. The main simulation paraters were orbit raising time, fuel mass, total satellite mass, thrust and exaust velocity. We conclude comparing our results with results obtainned with known space missions performed with Hall Thrusters. © 2008 by the American Institute of Aeronautics and Astronautics, Inc.

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Pós-graduação em Artes - IA

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Pós-graduação em Ciências Sociais - FFC

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Pós-graduação em História - FCHS

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Pós-graduação em Ciências Sociais - FFC

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Pós-graduação em Artes - IA