Net Feedback
Mostrando 1-12 de 32 artigos, teses e dissertações.
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1. Capacidade de regeneração da floresta tropical amazônica sob deficiência nutricional: resultados de um estudo numérico da interação biosfera-atmosfera / Amazon rainforest regrowth under nutrient stress: results from a biosphere-atmosphere interaction numerical study
This thesis investigates how the climate feedback and the nutrient feedback interact to regulate the patterns in the regrowth of the Amazon tropical forest after a large-scale deforestation. The study is performed using the fully coupled biosphere-atmosphere model CCM3-IBIS. Initially, the model was validated against observed climate and vegetation dynamics
Publicado em: 2008
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2. Variações diurnas da fotossíntese e efeitos do anelamento de ramos sobre a fotossíntese e o metabolismo do carbono em café arábica / Diurnal changes in photosynthesis and effects of branch girdling on photosynthesis and carbon metabolism in arabica coffee
This study was carried out in order to examine (i) the diurnal changes in photosynthesis rates under low atmospheric evaporative demand, and (ii) the relationship between the rate of net photosynthesis (A) and carbon (C) metabolism in experimentally-manipulated branches through girdling. Two experiments were separately conducted and so analyzed. In both expe
Publicado em: 2008
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3. AVALIAÇÃO INSTITUCIONAL NA GESTÃO DE DESEMPENHO ESCOLAR E EMPRESARIAL E O FEEDBACK EM REDE: UM ESTUDO DE CASOS MÚLTIPLOS. / Evaluation on school and entrepreneurial management performance and net feedback: a multiple case study
This dissertation on Performance Evaluation has as its objective a contribution to the discussion of the nature and application of the feedback tool in the undergraduate courses of Administração (Administration). This feedback would be a proposal for internal evaluation, i.e., the self evaluation of courses. Out of the difficulty of a self evaluation proce
Publicado em: 2007
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4. Modelo centralizado de compras da empresa alfa:uma estratégia logística para melhoria de competitividade.
At the urban Public transportation in Brazil, the Purchasing area represents outstanding opportunities for the company cost reductions and profitability increase. Purchasing expenditures have a direct impact at the financial bottom line results: each monetary unit saved at the Purchasing side, generates the same in net profit, as it is a direct cost reductio
Publicado em: 2007
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5. A timed Petri net methodology based on area estimator for hardware/software co-design systems environments / Uma metodologia para estimativa de Ãrea baseada em redes de Petri temporizadas para ambientes de sistemas de hardware/software co-design
Most modern electronic systems consist of dedicated hardware and programmable components (called software components). Over the last few years, the number of methodologies that concurrently apply design techniques from different areas to develop mixed hardware/software system has been growing considerably. The concurrent design of mixed hardware/software sys
Publicado em: 2004
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6. www.meanders.org na internet com ecoturismo: uma interação comunicacional sustentável? / www.meanders.org on the net with ecotourism: a sustainable communication interation?
A Teia de Alcance Mundial, como é conhecida a www da população que já tem acesso à internet, tem se tornado no Brasil rapidamente expressiva em tempos de mercados globais e, dentro deste contexto, a atividade do ecoturismo é analisada enquanto oferta e mensagem online. Realiza-se um estudo qualitativo exploratório no intuito de discutir a presente ofe
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/04/2002
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7. Feedback control of the rate of peat formation.
The role of peatlands in the global carbon cycle is confounded by two inconsistencies. First, peatlands have been a large reservoir for carbon sequestered in the past, but may be either net sources or net sinks at present. Second, long-term rates of peat accumulation (and hence carbon sequestration) are surprisingly steady, despite great variability in the s
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8. Nonasymptotic Species Richness Models and the Insects of British Trees
Nonasymptotic models of species diversity are those that do not consider negative feedback between number of species in a biota and the net rate of species addition. These models propose species richness differences to be primarily the product of geologic age differences among biotas. Nonasymptotic explanations are traditional for various diversity differenc
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9. An Explanation for the Difference in Photosynthetic Capabilities of Healthy and Beet Yellows Virus-infected Sugar Beets (Beta vulgaris L.) 1
Sugar beets (Beta vulgaris L.) infected with the Beet Yellows Virus exhibit lower rates of net photosynthesis at light saturation than do healthy plants. These Pn reductions were correlated with increases in leaf resistance to water vapor loss. Theoretical analyses demonstrated that, although the leaf resistance to water vapor loss increases could account fo
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10. Regulation of Sulfate Transport in Salmonella typhimurium
Dreyfuss, Jacques (Princeton University, Princeton, N.J.), and Arthur B. Pardee. Regulation of sulfate transport in Salmonella typhimurium. J. Bacteriol. 91:2275–2280. 1966.—The transport of sulfate into Salmonella typhimurium is an active process. Intracellular and extracellular sulfate are in rapid equilibrium. Although the entry process requires energ
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11. The firing rates of human motoneurones voluntarily activated in the absence of muscle afferent feedback.
1. To quantify the net influence of muscle afferent feedback on the firing rates of human motoneurones, the discharge frequencies of single motor axons in the common peroneal nerve were recorded during sustained voluntary efforts performed in the absence of feedback from the target muscle. These data were compared with the firing rates of single motor units
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12. Control of an external force in leg extensions in humans.
1. We investigated the hypothesis that mono- and bi-articular muscles perform different functions: the former are chiefly dependent on their mechanical advantage, while the latter are considered to be mainly concerned with controlling the direction of an external force. 2. Seven subjects were asked to exert a constant external force in various directions fro