Transitory Stability
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Análise de estabilidade transitória na otimização de sistemas elétricos de potência
Esta dissertação apresenta uma metodologia para associação de estudos de estabilidade transitória de ângulo de rotor com estudos de otimização de sistemas elétricos de potência. Nesta metodologia, são alterados, nas restrições do Fluxo de Potência Ótimo (FPO), os limites de potência ativa do(s) gerador(es) previamente identificado(s) através
Publicado em: 2009
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2. Amortecimento da celeridade de onda em condutos forçados. / Wave speed cushioning in forced conduit.
The projects of hydraulic networks define the capacity of outflow and pressure to meet a demand and to achieve the necessary resistance to guarantee the installation stability. The applied loading must not exceed structural resistance, there remaining a safety coefficient which guarantees the stability even in case of operational failure. The hydraulic simul
Publicado em: 2006
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3. Acquisition of mutans streptococci and periodontal pathogens by firstlings aged 7-19 months longitudinal study in families / Aquisição de Estreptococos mutans e periodontopatógenos por primogênitos de 7-19 meses de idade: estudo longitudinal em famílias
Oral colonization by pathogens as mutans streptococci (MS) and Porphyromonas gingivalis, microorganisms associated with caries and periodontal disease, respectively, is a pre-requirement for development of these multifactorial diseases. This longitudinal study investigated the period of acquisition and stability of colonization of MS and BANA-positive period
Publicado em: 2005
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4. UMA CONTRIBUIÇÃO PARA O CÁLCULO DO TEMPO CRÍTICO DA ESTABILIDADE TRANSITÓRIA DE SISTEMAS ELÉTRICOS DE POTÊNCIA USANDO REDES NEURAIS ARTIFICIAIS / A CONTRIBUTION FOR THE CALCULATION OF THE CRITICAL TIME OF THE TRANSITORY STABILITY OF ELECTRICAL SYSTEMS OF POWER USING ARTIFICIAL NEURAL NETS
O objetivo deste trabalho foi a utilização de redes neurais artificiais (RNA) para estimar o tempo crítico de eliminação de falta de um sistema de potência submetido a perturbações severas, dentro da área da estabilidade transitória de sistemas elétricos de potência. O tempo crítico é uma variável de difícil determinação, dado que é direta
Publicado em: 2004
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5. Contribuição ao estudo da instabilidade lateral de vigas pré-moldadas / On the lateral stability of precast concrete beams
The lateral stability of long and slender precast concrete beams requires great attention. In particular, it is important to ensure the stability of these members during transitory phases like tilting and transport, and also when the deformability of temporary supports is taken into account. The state of the art of the problem of lateral stability in precast
Publicado em: 2002
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6. EQUIVALENTE DINÂMICO POR AGREGAÇÃO DE GERADORES COERENTES / COHERENCY - BASED DYNAMIC EQUIVALENT
The spread and the interconection of Electrical Power Systems have been stressed the employment of dynamic equivalents by Electrical Power Companies for representing system áreas that they are not responsible for at planning and operation studies. Due to system model dimension reduction, studies have become faster with reduced costs and computational task r
Publicado em: 1982
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7. The Role of Pea Chloroplast [alpha]-Glucosidase in Transitory Starch Degradation.
Pea chloroplastic [alpha]-glucosidase (EC 3.2.1.20) involved in transitory starch degradation was purified to apparent homogeneity by ion exchange, reactive dye, hydroxylapatite, hydrophobic interaction, and gel filtration column chromatography. The native molecular mass and the subunit molecular mass were about 49.1 and 24.4 kD, respectively, suggesting tha
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8. Methanol Inhibition in Continuous Culture of Hansenula polymorpha†
Growth inhibition of Hansenula polymorpha DL-1 by methanol, formaldehyde, formate, and formic acid was examined to determine the causes of unstable behavior observed during continuous cultures on methanol. The much greater inhibition of growth by formic acid than by formate and the effect of formic acid excretion and assimilation on pH helped to explain cult
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9. Detection of multistability, bifurcations, and hysteresis in a large class of biological positive-feedback systems
It is becoming increasingly clear that bistability (or, more generally, multistability) is an important recurring theme in cell signaling. Bistability may be of particular relevance to biological systems that switch between discrete states, generate oscillatory responses, or “remember” transitory stimuli. Standard mathematical methods allow the detection
National Academy of Sciences.
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10. Longitudinal Study of Transmission, Diversity, and Stability of Streptococcus mutans and Streptococcus sobrinus Genotypes in Brazilian Nursery Children
The aim of this study was to perform a follow-up evaluation of the Streptococcus mutans and Streptococcus sobrinus colonization profile of children's oral cavities, which included the pattern of vertical transmission from mother to child, genotypic diversity, and stability of the strains. The subjects were 16 mother-child pairs, who were monitored for 20 mon
American Society for Microbiology.
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11. Binding site of brefeldin A at the interface between the small G protein ADP-ribosylation factor 1 (ARF1) and the nucleotide-exchange factor Sec7 domain
Sec7 domains (Sec7d) catalyze the exchange of guanine nucleotide on ARFs. Recent studies indicated that brefeldin A (BFA) inhibits Sec7d-catalyzed nucleotide exchange on ARF1 in an uncompetitive manner by trapping an early intermediate of the reaction: a complex between GDP-bound ARF1 and Sec7d. Using 3H-labeled BFA, we show that BFA binds to neither isolate
The National Academy of Sciences.