O problema da centralização versus descentralização é um assunto amplamente discutido pela Teoria Neoclássica, referindo-se ao nível hierárquico no qual as decisões devem ser tomadas. Sobre a descentralização, é correto afirmar que
Um paciente diabético necessita de tratamento clínico odontológico de rotina. Algumas atitudes prévias devem ser tomadas para que se possa ter sucesso e segurança no tratamento sem que haja qualquer complicação sistêmica com este paciente. Assinale a alternativa que não indica o que deveria ser realizado.
A Teoria sobre Estilos de Liderança são teorias que estudam a liderança em termos de comportamento do líder em relação aos seus subordinados, isto é, maneiras pelas quais o líder orienta sua conduta. Sobre esses estilos, é correto afirmar que, no estilo de liderança
A reabsorção mandibular está relacionada ao aumento de carga sobre a articulação temporomandibular. Isso ocorre normalmente após tratamento ortodôntico. Assim, pode-se afirmar que a reabsorção da mandíbula ocorre na região
Assinale a alternativa que apresenta a medida de desempenho organizacional a que Chiavenato se refere no trecho abaixo.
“[...] é uma medida de variação estatística em que já não se busca qualidade pela qualidade, mas pretende-se aperfeiçoar todos os processos de uma organização e serve para a organização toda, desde boletins de tempo de ciclo, dados de defeitos até metas de melhoria nos refeitórios e banheiros [...] se aprofunda para descrever a situação atual e prever o futuro.”
Read the text below to answer the questions 11-15.
NASA Researchers Studying Advanced Nuclear Rocket Technologies
January 9, 2013
By using an innovative test facility at NASA’s Marshall Space Flight Center in Huntsville, Ala., researchers are able to use non-nuclear materials to simulate nuclear thermal rocket fuels - ones capable of propelling bold new exploration missions to the Red Planet and beyond. The Nuclear Cryogenic Propulsion Stage team is tackling a three-year project to demonstrate the viability of nuclear propulsion system technologies. A nuclear rocket engine uses a nuclear reactor to heat hydrogen to very high temperatures, which expands through a nozzle to generate thrust. Nuclear rocket engines generate higher thrust and are more than twice as efficient as conventional chemical rocket engines.
The team recently used Marshall’s Nuclear Thermal Rocket Element Environmental Simulator, or NTREES, to perform realistic, non-nuclear testing of various materials for nuclear thermal rocket fuel elements. In an actual reactor, the fuel elements would contain uranium, but no radioactive materials are used during the NTREES tests. Among the fuel options are a graphite composite and a “cermet” composite - a blend of ceramics and metals. Both materials were investigated in previous NASA and U.S. Department of Energy research efforts.
Nuclear-powered rocket concepts are not new; the United States conducted studies and significant ground testing from 1955 to 1973 to determine the viability of nuclear propulsion systems, but ceased testing when plans for a crewed Mars mission were deferred.
The NTREES facility is designed to test fuel elements and materials in hot flowing hydrogen, reaching pressures up to 1,000 pounds per square inch and temperatures of nearly 5,000 degrees Fahrenheit - conditions that simulate space-based nuclear propulsion systems to provide baseline data critical to the research team.
“This is vital testing, helping us reduce risks and costs associated with advanced propulsion technologies and ensuring excellent performance and results as we progress toward further system development and testing,” said Mike Houts, project manager for nuclear systems at Marshall.
A first-generation nuclear cryogenic propulsion system could propel human explorers to Mars more efficiently than conventional spacecraft, reducing crews’ exposure to harmful space radiation and other effects of long-term space missions. It could also transport heavy cargo and science payloads. Further development and use of a first-generation nuclear system could also provide the foundation for developing extremely advanced propulsion technologies and systems in the future - ones that could take human crews even farther into the solar system.
Building on previous, successful research and using the NTREES facility, NASA can safely and thoroughly test simulated nuclear fuel elements of various sizes, providing important test data to support the design of a future Nuclear Cryogenic Propulsion Stage. A nuclear cryogenic upper stage - its liquid- hydrogen propellant chilled to super-cold temperatures for launch - would be designed to be safe during all mission phases and would not be started until the spacecraft had reached a safe orbit and was ready to begin its journey to a distant destination. Prior to startup in a safe orbit, the nuclear system would be cold, with no fission products generated from nuclear operations, and with radiation below significant levels.
“The information we gain using this test facility will permit engineers to design rugged, efficient fuel elements and nuclear propulsion systems,” said NASA researcher Bill Emrich, who manages the NTREES facility at Marshall. “It’s our hope that it will enable us to develop a reliable, cost-effective nuclear rocket engine in the not-too-distant future."
The Nuclear Cryogenic Propulsion Stage project is part of the Advanced Exploration Systems program, which is managed by NASA’s Human Exploration and Operations Mission Directorate and includes participation by the U.S. Department of Energy. The program, which focuses on crew safety and mission operations in deep space, seeks to pioneer new approaches for rapidly developing prototype systems, demonstrating key capabilities and validating operational concepts for future vehicle development and human missions beyond Earth orbit.
Marshall researchers are partnering on the project with NASA’s Glenn Research Center in Cleveland, Ohio; NASA’s Johnson Space Center in Houston; Idaho National Laboratory in Idaho Falls; Los Alamos National Laboratory in Los Alamos, N.M.; and Oak Ridge National Laboratory in Oak Ridge, Tenn.
The Marshall Center leads development of the Space Launch System for NASA. The Science & Technology Office at Marshall strives to apply advanced concepts and capabilities to the research, development and management of a broad spectrum of NASA programs, projects and activities that fall at the very intersection of science and exploration, where every discovery and achievement furthers scientific knowledge and understanding, and supports the agency’s ambitious mission to expand humanity’s reach across the solar system. The NTREES test facility is just one of numerous cutting-edge space propulsion and science research facilities housed in the state-of- the-art Propulsion Research & Development Laboratory at Marshall, contributing to development of the Space Launch System and a variety of other NASA programs and missions.
Available in: http://www.nasa.gov
Read the following sentence taken from the text.
“Nuclear rocket engines generate higherthrust and are more than twice asefficientas conventional chemical rocket engines.”
It is correct to affirm that the adjectives in bold and underlined are, respectively,
No Brasil, o modelo de administração burocrática emerge a partir dos anos 1930, em um quadro de aceleração da industrialização brasileira, em que o Estado assume papel decisivo, intervindo pesadamente no setor produtivo de bens e serviços. A década de 1930 foi um período de grandes transformações. Com o objetivo de realizar a modernização administrativa no Brasil, foi criado, em 1936, o Conselho Federal do Serviço Público Civil, transformado, em 1938, no Departamento Administrativo do Serviço Público – o DASP. Sobre o DASP, assinale a alternativa incorreta.
Na rotina da clínica diária, para a proteção do paciente, o cirurgião-dentista deve higienizar as mãos imediatamente antes de iniciar qualquer atendimento. Sobre esse tema, é correto afirmar que
As primeiras causas da lipotímia estão muito relacionadas ao medo do tratamento dentário e à administração da anestesia local. Sobre a lipotímia, assinale a alternativa correta.
Sobre o Sistema de Registro de Preços (SRP), analise as assertivas abaixo.
I. Trata-se de um novo tipo de licitação, incorporado pela Lei nº 8.666/1993.
II. A licitação para registro de preços será realizada na modalidade de concorrência, do tipo menor preço, nos termos da Lei nº 8.666/1993, ou na modalidade de pregão, nos termos da Lei nº 10.520/2002.
III. O contrato decorrente do Sistema de Registro de Preços deverá ser assinado no prazo de validade da ata de registro de preços.
A classificação que agrupa as más oclusões em 3 grandes grupos é a classificação que até hoje é utilizada em ortodontia. Assinale a alternativa que a apresenta.
Um investidor aplicou R$200.000,00 durante 2 anos em uma modalidade de investimento que oferece juros simples de 2% a.m.. Diante do exposto, é correto afirmar que o rendimento total do investimento após este período foi de
Leia o texto abaixo e, em seguida, assinale a alternativa que preenche corretamente a lacuna.
A ____________________ propõe um modelo administrativo dotado das seguintes características: direcionamento estratégico, limitação da estabilidade de servidores e regimes temporários de emprego, desempenho crescente e pagamento por desempenho-produtividade, transparência e cobrança de resultados (accountability), podendo ainda ser identificada como uma perspectiva inovadora de compreensão, análise e abordagem dos problemas da Administração Pública, com base no empirismo e na aplicação de valores e eficiência em seu funcionamento.
Read the text below to answer the questions 11-15.
NASA Researchers Studying Advanced Nuclear Rocket Technologies
January 9, 2013
By using an innovative test facility at NASA’s Marshall Space Flight Center in Huntsville, Ala., researchers are able to use non-nuclear materials to simulate nuclear thermal rocket fuels - ones capable of propelling bold new exploration missions to the Red Planet and beyond. The Nuclear Cryogenic Propulsion Stage team is tackling a three-year project to demonstrate the viability of nuclear propulsion system technologies. A nuclear rocket engine uses a nuclear reactor to heat hydrogen to very high temperatures, which expands through a nozzle to generate thrust. Nuclear rocket engines generate higher thrust and are more than twice as efficient as conventional chemical rocket engines.
The team recently used Marshall’s Nuclear Thermal Rocket Element Environmental Simulator, or NTREES, to perform realistic, non-nuclear testing of various materials for nuclear thermal rocket fuel elements. In an actual reactor, the fuel elements would contain uranium, but no radioactive materials are used during the NTREES tests. Among the fuel options are a graphite composite and a “cermet” composite - a blend of ceramics and metals. Both materials were investigated in previous NASA and U.S. Department of Energy research efforts.
Nuclear-powered rocket concepts are not new; the United States conducted studies and significant ground testing from 1955 to 1973 to determine the viability of nuclear propulsion systems, but ceased testing when plans for a crewed Mars mission were deferred.
The NTREES facility is designed to test fuel elements and materials in hot flowing hydrogen, reaching pressures up to 1,000 pounds per square inch and temperatures of nearly 5,000 degrees Fahrenheit - conditions that simulate space-based nuclear propulsion systems to provide baseline data critical to the research team.
“This is vital testing, helping us reduce risks and costs associated with advanced propulsion technologies and ensuring excellent performance and results as we progress toward further system development and testing,” said Mike Houts, project manager for nuclear systems at Marshall.
A first-generation nuclear cryogenic propulsion system could propel human explorers to Mars more efficiently than conventional spacecraft, reducing crews’ exposure to harmful space radiation and other effects of long-term space missions. It could also transport heavy cargo and science payloads. Further development and use of a first-generation nuclear system could also provide the foundation for developing extremely advanced propulsion technologies and systems in the future - ones that could take human crews even farther into the solar system.
Building on previous, successful research and using the NTREES facility, NASA can safely and thoroughly test simulated nuclear fuel elements of various sizes, providing important test data to support the design of a future Nuclear Cryogenic Propulsion Stage. A nuclear cryogenic upper stage - its liquid- hydrogen propellant chilled to super-cold temperatures for launch - would be designed to be safe during all mission phases and would not be started until the spacecraft had reached a safe orbit and was ready to begin its journey to a distant destination. Prior to startup in a safe orbit, the nuclear system would be cold, with no fission products generated from nuclear operations, and with radiation below significant levels.
“The information we gain using this test facility will permit engineers to design rugged, efficient fuel elements and nuclear propulsion systems,” said NASA researcher Bill Emrich, who manages the NTREES facility at Marshall. “It’s our hope that it will enable us to develop a reliable, cost-effective nuclear rocket engine in the not-too-distant future."
The Nuclear Cryogenic Propulsion Stage project is part of the Advanced Exploration Systems program, which is managed by NASA’s Human Exploration and Operations Mission Directorate and includes participation by the U.S. Department of Energy. The program, which focuses on crew safety and mission operations in deep space, seeks to pioneer new approaches for rapidly developing prototype systems, demonstrating key capabilities and validating operational concepts for future vehicle development and human missions beyond Earth orbit.
Marshall researchers are partnering on the project with NASA’s Glenn Research Center in Cleveland, Ohio; NASA’s Johnson Space Center in Houston; Idaho National Laboratory in Idaho Falls; Los Alamos National Laboratory in Los Alamos, N.M.; and Oak Ridge National Laboratory in Oak Ridge, Tenn.
The Marshall Center leads development of the Space Launch System for NASA. The Science & Technology Office at Marshall strives to apply advanced concepts and capabilities to the research, development and management of a broad spectrum of NASA programs, projects and activities that fall at the very intersection of science and exploration, where every discovery and achievement furthers scientific knowledge and understanding, and supports the agency’s ambitious mission to expand humanity’s reach across the solar system. The NTREES test facility is just one of numerous cutting-edge space propulsion and science research facilities housed in the state-of- the-art Propulsion Research & Development Laboratory at Marshall, contributing to development of the Space Launch System and a variety of other NASA programs and missions.
Available in: http://www.nasa.gov
Read the following sentence taken from the text.
“Nuclear rocket engines generate higher thrust and are more than twice as efficient as conventional chemical rocket engines.”
It is correct to affirm that the adjectives in bold and underlined are, respectively,