Differential Protection
Mostrando 1-12 de 209 artigos, teses e dissertações.
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1. A Greener Enzymatic Oligoesterification of Biobased Renewable Synthons
Polyesters of xylitol and succinic acid were prepared yielding from 70 to 75% by enzyme-catalyzed esterification using a molar mass from 1:1 to 2:5 at 120 and 140 °C employing from 1 to 10% m/m of enzyme. Control over branching degree was achieved by tuning the reaction conditions (temperature, time, comonomer ratio, enzyme content). This one-step process f
J. Braz. Chem. Soc.. Publicado em: 2021-06
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2. Evaluation of ex vivo melanogenic response to UVB, UVA, and visible light in facial melasma and unaffected adjacent skin,
Abstract Background: The independent role of solar radiation in the differential melanogenesis between melasma and adjacent skin is unknown. Objectives: To assess the melanogenic responses of skin with facial melasma and of the adjacent skin to UVB, UVA, and visible light, in an ex vivo model. Methods: This was a quasi-experimental study involving 22 pati
An. Bras. Dermatol.. Publicado em: 2020-12
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3. Ecologia e Mobilização Social: um Desafio para a Psicologia
Diversos foram os documentos elaborados por ocasião das conferências nacionais e internacionais sobre o meio ambiente. Parte desses documentos serviu como referência para que nações elaborassem políticas públicas de proteção e fiscalização ambiental. Entretanto, os resultados dessa produção documental ainda deixam muito a desejar diante dos índ
Psicol. cienc. prof.. Publicado em: 28/11/2019
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4. Comportamento térmico de compósitos de poliestireno reciclado reforçado com celulose de bagaço de cana
RESUMO O poliestireno expandido (EPS) é um polímero reciclável amplamente utilizado na fabricação de embalagens para isolamento acústico, proteção de bens de consumo duráveis e na indústria da construção civil. O PS é facilmente reciclável com o aumento da temperatura, podendo dar origem a novos materiais. Entretanto suas propriedades térmicas
Matéria (Rio J.). Publicado em: 16/09/2019
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5. Influência da ambiência escolar no estado nutricional de pré-escolares de Macaé, Rio de Janeiro, Brasil
Resumo Objetivou-se avaliar a ambiência escolar e o estado nutricional de pré-escolares da rede pública de Macaé. Trata-se de um estudo transversal, com dados antropométricos secundários, coletados entre 2012 e 2014. Foram analisadas 962 crianças, de 2,1 a 6,6 anos, de quatro escolas, segundo recomendação da Organização Mundial da Saúde. A ambiê
Ciênc. saúde coletiva. Publicado em: 22/07/2019
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6. Microencapsulation by lyophilization of carotenoids produced by Phaffia rhodozyma with soy protein as the encapsulating agent
Abstract Carotenoids are pigments that can be applied to food but they are unstable towards certain food intrinsic conditions, as well as processing ones. Microencapsulation is an alternative to increasing their stability. This study aimed to produce carotenoids by Phaffia rhodozyma crops and promote their microencapsulation by lyophilization with soy protei
Food Sci. Technol. Publicado em: 2017-12
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7. Genetic diversity of Morato's Digger Toad, Proceratophrys moratoi: spatial structure, gene flow, effective size and the need for differential management strategies of populations
Abstract The Morato's Digger Toad, Proceratophrys moratoi, is a critically endangered toad species with a marked population decline in southern Brazilian Cerrado. Despite this, new populations are being discovered, primarily in the northern part of the distribution range, which raises a number of questions with regard to the conservation status of the specie
Genet. Mol. Biol.. Publicado em: 05/06/2017
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8. Inclusión diferencial de extranjeros/migrantes a trasplantes de órganos: dilemas éticos frente a "prácticas no éticas"
Abstract This article addresses the way in which certain ethical dilemmas related to organ transplantation to "nonresident" foreigners are enacted by the Argentine government through regulations that define differentiated treatments between national and non-national transplanted subjects. While establishing how they are connected to migration policies, it de
REMHU, Rev. Interdiscip. Mobil. Hum.. Publicado em: 2017-05
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9. AC Induced Corrosion of Underground Steel Pipelines. Faradaic Rectification under Cathodic Protection: II. Theoretical Approach with Electrolyte Resistance and Double Layer Capacitance for Bi-Tafelian Corrosion Mechanism
AC corrosion enhancement of buried steel pipe is induced by high stray AC electromagnetic field and to the faradaic rectification due to non-linearity of current-potential characteristics. In Part I, this phenomenon was evaluated by neglecting the electrical resistance of soil electrolyte. In this part, we will examine when this resistance is no longer negli
J. Braz. Chem. Soc.. Publicado em: 2016-03
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10. Changes in wild bee fauna of a grassland in Brazil reveal negative effects associated with growing urbanization during the last 40 years
Bee fauna and associated flora from a grassland site in Brazil, surveyed 40 and 20 years ago, were newly surveyed with comparable methodology to evaluate changes in the bee fauna of this site, considering that human population and urbanization has exponentially increased in the last 40 years. In general, bee species richness has declined in 22%, as well as t
Zoologia (Curitiba). Publicado em: 2013-04
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11. Algoritmo híbrido e inteligente para o diagnóstico das condições operativas de transformadores de potência no contexto da qualidade da energia elétrica / Hybrid intelligent algorithm for the diagnosis of operating conditions of power transformers in the context of power quality
This research aimed to develop an algorithm able to diagnose the operating conditions of power transformers. The variables considered to classify the presented conditions were the normally used by differential protection logic, i.e., the differential current and the harmonic content in the signals in analysis. Moreover, the relationship between some phenomen
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/07/2012
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12. Projeto diferencial de geradores síncronos: o uso de redes neurais artificiais para identificação e correção da saturação dos transformadores de corrente / Differential protection for synchronous generators: the use of artificial neural networks for identification and correction of the saturation of current transformers.
Este trabalho tem como objetivo apresentar um algoritmo de proteção diferencial de geradores baseado em Redes Neurais Artificiais (RNAs), que seja robusto e confiável em situações onde os algoritmos padrões podem apresentar dificuldades, como no caso, da saturação de TCs. O algoritmo desenvolvido é constituído por dois módulos principais: a) um m�
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/03/2012