938 resultados para Análise temporal


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Species composition, biomass, density, and diversity of benthic invertebrates from six bard-bottom areas were evaluated. Seasonal collections using a dredge, trawl, and suction and grab samplers yielded 432, 525, and 845 taxa, respectively. Based on collections wltb the different gear types, species composition of invertebrates was found to change bathymetrically. Inner- and mlddle-shelf sites were more similar to each other in terms of invertebrate species composition than they were to outer-shelf sites, regardless of season. Sites on the inner and outer shelf were grouped according to latitude; however, results suggest that depth is apparently a more important determinant of invertebrate species composition than either season or latitude. Sponges generally dominated dredge and trawl collections in terms of biomass. Generally, cnidarians, bryozoans, and sponges dominated at sites In terms of number of taxa collected. The most abundant smaller macrofauna collected in suction and grab samples were polychaetes, amphipods, and mollusks. Densities of the numerically dominant species changed botb seasonally and bathymetrically, with very few of these species restricted to a specific bathymetrlc zone. The high diversity of invertebrates from hard-bottom sites is attributed to the large number of rare species. No consistent seasonal changes in diversity or number of species were noted for individual stations or depth zones. In addition, H and its components showed no definite patterns related to depth or latitude. However, more species were collected at middle-shelf sites than at inner- or outer-shelf sites, which may be related to more stable bottom temperature or greater habitat complexity in that area. (PDF file contains 110 pages.)

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Estuda os modelos de incentivo à cultura e orçamentos para o setor, em países diversos, consistindo em análise de casos distintos que possam subsidiar possíveis alterações e aperfeiçoamentos nos mecanismos de incentivo cultural no Brasil. Serão abordados modelos de países das Américas, da Europa e da Ásia.

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Apresenta elementos relevantes relacionados ao desenvolvimento de políticas culturais na França e no Brasil, de maneira a tentar contribuir para um compreensão comparativa dos dois casos e para o aperfeiçoamento das iniciativas brasileiras na área.

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Monografia (especialização) – Curso de Parlamento e Direito, Câmara dos Deputados, Centro de Formação, Treinamento e Aperfeiçoamento (Cefor), 2015.

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Monografia (especialização) – Curso de Parlamento e Direito, Câmara dos Deputados, Centro de Formação, Treinamento e Aperfeiçoamento (Cefor), 2015.

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Analisa o debate em torno da atividade dos grupos de pressão, especialmente a sua regulamentação, prática essa também conhecida como lobby. Para isso, dividiu-se a análise em quatro partes, incluindo conceitos, teorias consagradas, formas e mecanismos de atuação e as possibilidades de regulamentação da atividade no Brasil.

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Trata do regime de exploração de petróleo no Brasil, analisando as vantagens e desvantagens do regime de partilha e do regime de concessão.

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Analisa o conteúdo da minuta de resolução do Conselho Nacional do Meio Ambiente (Conama) submetida à consulta pública na Internet entre 04/02/2016 e 14/02/2016. Serão apresentados na seção 1, uma análise geral de como a proposta se insere na legislação ambiental brasileira e qual é a lógica que a norteia; na seção 2, comentários sobre os dispositivos da proposta que, na visão das autoras desta nota, são polêmicos ou necessitam de aperfeiçoamento; e, na seção 3, um quadro que analisa a lista de empreendimentos sujeitos a licenciamento ambiental segundo a legislação atualmente em vigor e segundo a minuta objeto de consulta.

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Analisa o sistema de metas fiscais brasileiro que é baseado na apuração de resultado primário com intuito de manter a sustentabilidade da dívida pública.

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Neurons in the songbird forebrain nucleus HVc are highly sensitive to auditory temporal context and have some of the most complex auditory tuning properties yet discovered. HVc is crucial for learning, perceiving, and producing song, thus it is important to understand the neural circuitry and mechanisms that give rise to these remarkable auditory response properties. This thesis investigates these issues experimentally and computationally.

Extracellular studies reported here compare the auditory context sensitivity of neurons in HV c with neurons in the afferent areas of field L. These demonstrate that there is a substantial increase in the auditory temporal context sensitivity from the areas of field L to HVc. Whole-cell recordings of HVc neurons from acute brain slices are described which show that excitatory synaptic transmission between HVc neurons involve the release of glutamate and the activation of both AMPA/kainate and NMDA-type glutamate receptors. Additionally, widespread inhibitory interactions exist between HVc neurons that are mediated by postsynaptic GABA_A receptors. Intracellular recordings of HVc auditory neurons in vivo provides evidence that HV c neurons encode information about temporal structure using a variety of cellular and synaptic mechanisms including syllable-specific inhibition, excitatory post-synaptic potentials with a range of different time courses, and burst-firing, and song-specific hyperpolarization.

The final part of this thesis presents two computational approaches for representing and learning temporal structure. The first method utilizes comput ational elements that are analogous to temporal combination sensitive neurons in HVc. A network of these elements can learn using local information and lateral inhibition. The second method presents a more general framework which allows a network to discover mixtures of temporal features in a continuous stream of input.

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The effect of temporal synchronization between the chirped signal pulse and the pumping pulse in an optical parametric chirped pulse amplification laser system is researched theoretically and experimentally. The results show that the gain of optical parametric amplification is sensitive to the temporal synchronization. Therefore, accurate temporal synchronization between the chirped signal pulse and the pumping pulse is essential to obtain high optical parametric amplification gain and stable output from an optical parametric chirped pulse amplification laser. Based on our 16.7-TW/120-fs optical parametric chirped pulse amplification laser system with similar to1-ns pumping pulse duration and <10-ps time jitter between the signal and pumping pulse, the effect of the temporal synchronization on optical parametric chirped pulse amplification is demonstrated. The experimental results agree with the calculation. (C) 2004 Society of Photo-Optical Instrumentation Engineers.