Phase Shift
Mostrando 13-24 de 547 artigos, teses e dissertações.
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13. Detection of acute cerebral hemorrhage in rabbits by magnetic induction
Acute cerebral hemorrhage (ACH) is an important clinical problem that is often monitored and studied with expensive devices such as computed tomography, magnetic resonance imaging, and positron emission tomography. These devices are not readily available in economically underdeveloped regions of the world, emergency departments, and emergency zones. We have
Braz J Med Biol Res. Publicado em: 2014-02
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14. All-optical cryptography through spectral amplitude and delay encoding
All-optical data encryption is a promising technology that could lead communication systems to an unprecedented degree of security. In this paper we use computer simulations to systematically investigate a new all-optical cryptography technique that is bit-rate independent and transparent to modulation formats. Encryption encompasses signal spectral slicing
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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15. Optical cryptography through analog control of amplitude and delay of spectral slices: anlysis for NRZ and DQPSK signals. / Criptografia Ãptica mediante controle analÃgico da amplitude e do atraso de fatias espectrais: anÃlise para sinais NRZ e DQPSK.
This work investigates a technique to encrypt the optical signal for Transparent Optical Network, TON, in order to safeguard the confidentiality and guarantee the security of informations that are transmitted through the Telecommunications Network. The technique is assessed on the physical layer of the reference model for open systems interconnection, OSI, a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/11/2012
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16. Crescimento e propriedades vibracionais de cristais a base de Ãxidos / Growth and Vibrational Properties of Oxide Crystals
In this work we used different experimental techniques to study four different series of inorganic oxide crystals, namely: (i) congruent lithium isotope niobate (C7LN), (ii) rare-earth doped mixed vanadates ((Nd,Yb):YxGd1-x(VO4)); (iii) alkali metal doped and pure calcium barium niobates (CaxBa1-xNb2O6); and (iv) potassium tantalite niobate (KTa1-xNbxO3). Be
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/03/2012
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17. CLASSIFICAÇÃO DE FASES EM IMAGENS HIPERESPECTRAIS DE RAIOS X CARACTERÍSTICOS PELO MÉTODO DE AGRUPAMENTO POR DESLOCAMENTO PARA A MÉDIA / PHASE CLASSIFICATION IN CHARACTERISTIC X-RAYS HYPERSPECTRAL IMAGES BY MEAN SHIFT CLUSTERING METHOD
No presente trabalho será introduzido o algoritmo de Agrupamento por Deslocamento para a Média (ADM) como uma alternativa para executar a classificação de fases em materiais a partir de imagens hiperspectrais de mapas raios X característicos. Ao contrário de outras técnicas estatísticas multivariadas, tal como Análise de Componentes Principais (ACP)
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/01/2012
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18. A RELAÇÃO ENTRE CAPITAL HUMANO E CAPITAL PSICOLÓGICO
Intangible assets received special attention from scholars in recent years in the organization context of human resource management, since theoretical proposals were developed to understand (them) and measure them. Anchored in this line of research are human capital and psychological capital. While human capital is what workers can do, the psychological capi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/10/2011
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19. Propriedades eletrônicas de grafeno com defeitos
No limite de baixas energias, o grafeno pode ser descrito por uma teoria de férmions livres sem massa. Neste trabalho, escrevemos uma métrica não-Euclidiana que representa o grafeno e introduzimos um campo de gauge não-Abeliano devido a presença de defeitos topológicos (desclinações). Neste pano de fundo, estudamos o espalhamento elástico de férmio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/08/2011
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20. O processo de notificação da queixa técnica de material de consumo de uso hospitalar no contexto do gerenciamento de recursos materiais em um hospital universitário público / The notification process of technical complaints about consumption material for hospital use in the context of material resources management in a public university hospital
The management of material resources in the nosocomial field has gained prominence mainly due to the technological advances that have occurred in recent decades. The incorporation of sophisticated technology can be perceived by the increase in the complexity of care practices and the challenges that the managers of public and private institutions face due to
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/07/2011
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21. ComunicaÃÃo cinÃsica do recÃm-nascido sob influÃncia do manuseio e ruidos em uma unidade neonatal / Kinesic communication of newborn related to the handling of health and noise in neonatal intensive care unit
The kinesics capture of newborns admitted to Neonatal Units (NUs) is necessary for a care based on humanization. The objective was to assess the kinesics of newborns in a NU, related to the handling of health professionals and noise produced in the Unit, according to Birdwhistell (1985). Descriptive exploratory study of quantitative approach carried out at N
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/05/2011
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22. Migração por extrapolação de ondas em três dimensões / Migration by wave extrapolation in three dimensions
In three dimensions, migration methods based on solving the one-way wave equation, besides facing problems to handle evanescent waves and to image steep dip reflectors, are still computationally expensive. For the problems of imaging steep dip reflectors and treat evanescent waves, in this dissertation, we use the complex Padé approximation. Because solving
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/04/2011
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23. Conversion of sandy tailing from banded iron formation exploitation into glass-ceramic materials
Glass-ceramic materials made of 40.0 wt. (%) of sandy tailing from banded iron formation exploitation and 60 wt. (%) of slag from steelwork were analyzed. Vitrification was obtained by heating the batch samples up to 1400 °C for 1 hour and quenching the melt on a stainless steel plate. Devitrification was obtained by heat-treating the as-quenched glass samp
Materials Research. Publicado em: 13/12/2011
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24. Influence of scheduled restricted feeding on reentrainment of motor activity rhythm after a 6-h light-dark advance in rats
Circadian rhythms are entrained to cyclic environmental cues such as the light-dark cycle and food availability. The suprachiasmatic nucleus of the hypothalamus is the main circadian oscillator in mammals and is entrained primarily by the light-dark cycle, although in some experimental situations food availability can affect its oscillation. Here we tested w
Psychology & Neuroscience. Publicado em: 2011-12