Distance Spectrum
Mostrando 13-24 de 70 artigos, teses e dissertações.
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13. An analytical treatment of the energy spectrum of hydrogen-like atoms perturbed by a generalized van der Waals potential
Hydrogen-like atoms are two-particle systems governed with spherically symmetric potentials, their non-relativistic Schrödinger equations can be solved analytically yielding exact information about their spectra. Vigorous interest in the investigation of their behavior under the influence of external fields has been increased over the years. The main goal o
Brazilian Journal of Physics. Publicado em: 2009-06
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14. Multi-modelo de referência para planejamento em espectro de alta complexidade / A multi-model reference for planning high complexity spectrum
This thesis intends to contribute to the planning guidelines in the field of distance education (DE). Thus, it develops a multi-model reference proposal supported by the definition of a highly complex spectrum of strategies that considers a sequence of systematic procedures in the following phases: (i) Determining the information needs in two stages: (a) ide
Publicado em: 2009
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15. Neurobehavioral effects of fipronil long term exposure in rats / Efeitos neurocomportamentais da exposição prolongada de ratos ao fibronil
Fipronil is a phenylpyrazole insecticide with broad spectrum, developed to selectively inhibit insect GABA-gated chloride channels; both in Veterinary Medicine, and in Agriculture it has been used for the control of nuisances. Although several studies try to understand the mechanism of neuronal toxicity of pesticide in mammalian, there are few studies relate
Publicado em: 2009
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16. VARIAÇÕES ESPACIAIS DE PROPRIEDADES FÍSICAS DO REMANESCENTE DE SUPERNOVA RCW 103
Since the observation of the supernova event SN 1987A, observational research on supernova and supernova remnants, including the ones on the optical spectrum, has been much explored. However, most of these studies have been limited to present integrated or punctual data from extragalactic or galactic supernova remnants. The present work has the objective of
Publicado em: 2008
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17. Desenvolvimento de um sistema para estimativa de bem-estara aprtir de dados de vocalização de suinos / Development of a system to estimate of wefare from data vocalization of pigs
As atuais tendências de mercado e exigências dos consumidores, juntamente com regulamentações de normas e padronizações relacionadas ao bem-estar animal têm provocado um forte impacto sobre a produção suinícola brasileira e podem afetar as exportações. Na mesma medida, a preocupação com a produção de alimentos está cada vez mais voltada para
Publicado em: 2008
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18. Frequency domain concurrent channel equalization for multicarrier systems
Receivers for wireless Orthogonal Frequency Division Multiplexing (OFDM) systems usually perform the channel estimation based on pilot carriers in known positions of the channel spectrum. Interpolation between pilot carriers is applied to determine the channel transfer function in all carrier frequencies. Channel variations along time are compensated by mean
Journal of the Brazilian Computer Society. Publicado em: 2007-03
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19. SPECTRUM FREQUENCY BIDDING VALUATION FOR WIMAX: A REAL OPTIONS APPROACH / AVALIAÇÃO DE LICITAÇÃO DE ESPECTROS DE RADIOFREQÜÊNCIAS PARA WIMAX: UMA ABORDAGEM POR OPÇÕES REAIS
WiMAX is a broadband wireless technology developed as an alternative to DSL and cable, to offer infrastructure last mile connectivity for business and residential clients, covering great distance. This new wireless standard is considered in telecommunication marketing as an opportunity to offer broadband in areas where this service does not exist. As any wir
Publicado em: 2007
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20. A methodology for noise prediction of turbofan engines.
A computional model is developed for prediction of noise emission from na existing or new turbofan engine. This model allows the simulation of noise generation from high bypass ratio turbofan engines, appropriate for use with computational programs for gas turbine performance developed at ITA. Analytical and empirical methods are used for spectrum shape, spe
Publicado em: 2006
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21. Caracterização cromática das fontes alimentares de origem vegetal do sagui-do-cerrado (Callithrix penicillata, PRIMATES)
The colour vision ability depends on the presence of different classes of retinal photoreceptors and subsequent compatible neural tracts. The basic mammalian colour vision status is dichromacy, resulting of the presence of two different types of cones. Primates and some marsupials are exceptions for this status, which may present trichromatic colour vision.
Publicado em: 2006
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22. COMPARAÇÃO DE DOIS TIPOS DE SOLUÇÃO NO POSICIONAMENTO COM RECEPTORES GPS / COMPARISON BETWEEN TWO TYPES OF SOLUTION IN THE POSITIONING WITH GPS RECEIVERS
The basic principle of GPS use consists in the simultaneous measure of the distances between the receiver antenna and at least four satellites of the constellation. Known the distance from the satellite to the receiver antenna and the satellites coordinates, it is possible to calculate the user antenna coordinates in the same reference system of the satellit
Publicado em: 2006
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23. Evaluation of the divergence of a thermal neutron beam using a Position Sensitive Detector
The divergence of the thermal neutron beam available at the main outlet channel of the Argonauta Reactor in the Instituto de Engenharia Nuclear has been measured by using a Position Sensitive Detector. The measurement process addressing a proper beam characterization has been conducted under several geometric arrangements, including attempts to reduce the be
Brazilian Journal of Physics. Publicado em: 2005-09
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24. Utilization of spectroscopy in the infrared region (FTIR) and chemometry in the identification of adulterated toasted and ground coffee. / UtilizaÃÃo da espectroscopia na regiÃo do infravermelho (FTIR) e quimiometria na identificaÃÃo do cafà torrado e moÃdo adulterado.
In this work the potentialities of the chemometric techniques and the eases in the obtaining of spectra presented by the spectroscopy techniques in the infra-red region with Fourier transform (FTIR) through the attenuated total reflectance (ATR), drift reflectance (DRIFT) and transmittance, aiming at the identification of barley (substance used as an adulter
Publicado em: 2005