Transmission Net
Mostrando 25-36 de 55 artigos, teses e dissertações.
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25. AnÃlise de desvios dos resultados financeiros de projetos de transmissÃo de rede bÃsica : caso CHESF / Analysis of deviations and financial results in basic energy transmission net projects â CHESF
Companies need to be every day more competitive, for this their costs should be minimized, and properly measured. This work has, as the major objective, to measure the SÃo Franscisco Hidro-Eletric Company (CHESF) basic energy net transmission investments, evaluating the process deviations, since the National Electrical Energy Agency (ANEEL) approval to the
Publicado em: 2005
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26. Ectoparasitismo em aves silvestres em um fragmento de mata (Uberlândia, MG)
This work aimed: to determine the prevalence and the parasitic burden of ticks in wild birds; to identify the species of ticks found in those birds; to correlate the occurrence and the parasitic load of ticks with ecological variables of the hosts; and to determine the prevalence of feather mites and of chewing lices in the species of captured birds. The stu
Publicado em: 2005
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27. Regime de ciclos com progressão continuada nas escolas públicas: um cenário para o estudo dos impactos das mudanças educacionais no capital cultural e habitus dos professores. / CYCLE REGIME WITH ONGOING PROGRESSION IN THE SÃ PAULO PUBLIC SCHOOLS: a scene for the study of the impacts of the educational changes in the cultural capital and habitus of the professors.
The aim of this study is to contribute to the comprehension of how the changes entailed in the educational reform work and are expressed. It was accomplished based on a research about the new set, relative to the scholar organization, created by the changes introduced with the implantation of Cycle Regime with Ongoing Progression at elementary education in p
Publicado em: 2005
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28. A relação entre investigação científica e intervenção social na experiência da Unitrabalho (1994-2000)
The central subject of the thesis is the relation between scientific inquiry and the social intervention in the experience of the Inter University Net of Studies and Researches about Work - UNITRABALHO. In the decade of90, a group of directors ofBrazilian universities, moved for desire to brighten up what they had called debt of the university to the workers
Publicado em: 2004
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29. Um modelo de previsão de carga por barramento
In the operation of an electric power system, an important stage is the determination of the daily operation programme, which determines a plan of electric power production for the following day(s) for each of the generating units of the system, usually on an hourly or a half-hourly basis. This programme is used by the system s real time operation as an oper
Publicado em: 2004
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30. Modelling lucerne (Medicago sativa L.) crop response to light regimes in an agroforestry system
The general goal of this research was to understand the agronomic and physiological changes of a lucerne crop in distinct physical radiation environments and to verify the potential of lucerne to grow under shaded conditions. To achieve this, the research was conducted in four main steps: (i) firstly, experimental data collection in the field using two artif
Publicado em: 2002
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31. UM MODELO PARA A TARIFAÇÃO DE REDES DE TRANSMISSÃO / A MODEL FOR TRANSMISSION NETWORKS PRICING
Esta dissertação apresenta um novo modelo de tarifação de redes elétricas. Este modelo é baseado no planejamento ótimo da expansão para a obtenção da rede elétrica economicamente adaptada. Com ele, são extraídas as tarifas de transmissão bem como os custos de déficit em cada barra, instrumentos necessários ao Órgão Regulador para a expansã
Publicado em: 1998
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32. Planejamento da expansão da geração de sistemas hidrotermicos de potencia, otimizando os usos multiplos da agua dos reservatorios
A substantial contribution to the development of generation expansion planninq for hydrothermal power systems is aimed at in this work. The possible multiple uses of the water from candidate hydro plant reservoirs are considered, employinq conversational techniques of multiobjective programminq. Initially, a modeling based on linear programming is presented
Publicado em: 1990
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33. Heterogeneities in the transmission of infectious agents: Implications for the design of control programs
From an analysis of the distributions of measures of transmission rates among hosts, we identify an empirical relationship suggesting that, typically, 20% of the host population contributes at least 80% of the net transmission potential, as measured by the basic reproduction number, R0. This is an example of a statistical pattern known as the 20/80 rule. The
The National Academy of Sciences of the USA.
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34. Selective modulation of excitatory and inhibitory microcircuits by dopamine
Dopamine plays an important role in the working memory functions of the prefrontal cortex, functions that are impacted in age-related memory decline, drug abuse, and a wide variety of disorders, including schizophrenia and Parkinson's disease. We have previously reported that dopamine depresses excitatory transmission between pyramidal neurons in the prefron
The National Academy of Sciences.
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35. Net uptake of gamma-aminobutyric acid by a high-affinity system of rat brain synaptosomes.
Rat brain synaptosomes isolated on discontinuous Ficoll gradient carry out rapid net uptake of gamma-aminobutyric acid through a high-affinity system (Km = 6.25 microM; Vmax = 1.2 nmol/min per mg of protein). The uptake of the labeled neurotransmitter is dependent on sodium concentration and is abolished by addition of 40 microM veratridine or 0.5 mM 2,4-dia
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36. Direct imaging of nanoscale magnetic interactions in minerals
The magnetic microstructure of a natural, finely exsolved intergrowth of submicron magnetite blocks in an ulvöspinel matrix is characterized by using off-axis electron holography in the transmission electron microscope. Single-domain and vortex states in individual blocks, as well as magnetostatic interaction fields between them, are imaged at a spatial res
National Academy of Sciences.