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关于污秽条件下使用的高压绝缘子的选择和尺寸确定方法

邱志贤2010-01-01DOAJ (DOAJ: Directory of Open Access Journals)

简单介绍了IEC/TS60815-1、-2:2008相对IEC/TR60815:1986的变化,还以西安电瓷研究所自然污秽试验站和污秽实验室进行的人工和自然污秽试验结果为例说明IEC/TS60815-1中规定的污秽条件下使用的高压绝缘子的选取和尺寸确定方法。新版的IEC/TS60815系列规范对污秽条件下使用的高压绝缘子的选择和尺寸确定比旧版标准提供了更确切的方法和更多的选择。介绍了IEC/TS60815-1中规定的3种方法中的方法1(使用过去的经验)和方法2(测量和试验),结果表明,这两种方法的结果是一致的。在方法2中,详细地介绍了简化统计法的应用过程。

High voltage insulation and dielectric phenomenaElectrical Fault Detection and ProtectionMedical Research and Treatments

高压开关的润滑技术

赵玥2010-01-01DOAJ (DOAJ: Directory of Open Access Journals)

通过对德国工业润滑相关标准、相关实验及实际高压开关设备的润滑应用工况,解析了高压电气接触、SF6动态密封和操动机构的润滑优化依据和典型的行业应用。总结了高压电气接触润滑、操动机构、GIS密封润滑剂应用的成分、种类选择:低于60 kV的电气接触润滑,考虑到应用经济性可选择PAO(全合成烃类)+特殊皂基专用电气接触润滑脂;高于60 kV的电气接触润滑必须选择PFPE(全氟聚醚)+PTFE(聚四氟乙烯类)专用特制电气接触润滑脂;SF6动态密封根据使用的橡胶材料EPDM,需要使用PG(聚乙二醇类)、硅基础、PFPE类润滑脂,润滑的关键是和EPDM兼容性好,高粘附性但具有低摩擦系数、抗腐蚀性介质;弹簧操动机构的润滑需要考虑润滑脂的抗老化性、…

Power Transformer Diagnostics and InsulationEngineering and Materials Science StudiesHigh voltage insulation and dielectric phenomena

Análise da segurança estrutural da ponte Marechal Hermes sob efeito de corrosão usando confiabilidade estrutural.

Leidimar Freire Brandão2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

Estruturas de pontes estão sujeitas a deterioração causada por diversos fatores, tais como: ambiente agressivo, mudança de carga de tráfego, choque de veículos. O fato de estas serem estruturas muito expostas faz com que o processo de degradação seja acelerado. Sabe-se ainda que o custo de implantação de uma estrutura…

Infrastructure Maintenance and MonitoringConcrete Corrosion and DurabilityEngineering and Material Science Research

Modeling and virtual simulation of blade for small wind rotor

Júlio César Pinheiro Pires、Branca Freitas de Oliveira2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

Este trabalho apresenta um estudo para aerogerador de pequeno porte projetado para uso residencial. A ênfase está na modelagem e simulação virtual da estrutura das pás em composito de fibra de vidro. A modelagem foi feita com software para desenho assistido por computador (CAD 3D). Para o projeto, foi escolhido o perf…

Material Selection and PropertiesTree Root and Stability StudiesWind Energy Research and Development

Influence of content of chromium and molybdenum microstructure and texture in alloy Fe-Cr-Mo

Lorena Braga Moura2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

The effects of chemical composition on texture and microstructure of five Fe-Cr-Mo alloys with 17%, 15% and 9% chromium contents and 5%, 7% and 9% molybdenum contents were investigated. The thermodynamic study of alloys for all investigated compositions showed the presence of secondary phases such as Mu (μ), Chi (χ),…

Hydrogen embrittlement and corrosion behaviors in metalsFusion materials and technologiesMicrostructure and Mechanical Properties of Steels

Accelerated carbonation in the early ages of cellulose pulps reinforced cement composites

Alessandra Etuko Feuzicana de Souza Almeida、Gustavo Henrique Denzin Tonoli、Sergio Francisco dos Santos 等 4 位作者2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

O objetivo deste trabalho foi avaliar o efeito carbonatação acelerada nas propriedades físicas e desempenho mecânico de compósitos cimentícios reforçados com altos teores de polpas celulósicas. Os compósitos foram moldados em laboratório pelo processo de sucção a vácuo do excesso de água e posterior prensagem, e a car…

Concrete and Cement Materials ResearchMicrobial Applications in Construction MaterialsNatural Fiber Reinforced Composites

Characterization by X-ray diffraction and Mössbauer spectroscopy of SnO2 nanoparticles doped with iron

Thiago Soares Ribeiro2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

In this work structural characterization by x-ray diffraction and M¨ossbauer spectroscopy of Fe-doped semiconducting oxide SnO2 nanoparticles is reported. The compound under study (Sn1−xFexOy) was prepared by high energy ball milling and proteic sol-gel. The samples prepared by ball milling showed an increase of Fe-do…

Chalcogenide Semiconductor Thin FilmsZnO doping and propertiesGas Sensing Nanomaterials and Sensors

Journal of Physical Chemistry C

Roberto Rivelino、Renato Elias Rodrigues de Souza Santos、F. de Brito Mota 等 8 位作者2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

Texto completo: acesso restrito. p.16367–16372

Advanced Physical and Chemical Molecular InteractionsChemical and Physical Properties of MaterialsInorganic and Organometallic Chemistry

Influência de revestimentos comestíveis e refrigeração na conservação da amora-preta

Dalany Menezes Oliveira2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

Blackberry is a short lived post-harvest fruit; it has a fragile structure and high breathing/respiratory activity. For these reasons, technologies that improve its shelf life should be studied, in order to ensure longer preservation and quality. The aim of this study was to evaluate the post-harvest lifetime, of the…

Nanocomposite Films for Food PackagingPostharvest Quality and Shelf Life ManagementGrowth and nutrition in plants

Spectrochimica Acta Part B: Atomic Spectroscopy

Heike Gleisner、Bernhard Welz、Jürgen W. Einax 等 6 位作者2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

Texto completo: acesso restrito. p.864-869

Thermal and Kinetic AnalysisInorganic and Organometallic ChemistryX-ray Spectroscopy and Fluorescence Analysis

Determinação de propriedades estruturais, elétricas e magnéticas da solução sólida de (1-x) BiFeO3-(x)PbTiO3 na região contorno de fases morfotrópico

Otávio Augusto Protzek2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

The (1-x)BiFeO3(x)PbTIO3 system is classified as a multiferroic system, whose present magnetic and electric ordering. Furthermore, it possesses a morphotropic phase boundary that makes it a very attractive system for practical applications, since compositions at the morphotropic phase boundary can present enhanced phy…

Dielectric properties of ceramicsFerroelectric and Piezoelectric MaterialsMultiferroics and related materials

Extração multielementar simultânea com a solução de Mehlich-1 para solos do Sul do Brasil e determinação por espectrofotometria de emissão ótica por plasma induzido e os efeitos nas recomendações de adubação para as culturas

Leandro Bortolon、Clésio Gianello2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

As quantidades de macro (P, K, Ca e Mg) e micronutrientes (Cu e Zn) extraídos com a solução de Mehlich-1 (M1), por KCl 1,0 mol L-1 (KCl) e com o HCl 0,1 mol L-1 (HCl), em solos representativos do Rio Grande do Sul, foram comparadas com as quantidades de nutrientes extraídos com a solução de Mehlich-1 determinados por…

Clay minerals and soil interactionsSoil Geostatistics and MappingSoil Carbon and Nitrogen Dynamics

Starch blende development of inhame codified with quitosana and pva

Paloma Eduarda Amatti Ferreira da Silva2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

The aim of this study were to modify chemically the yam starch (Dioscorea esculenta L.) by oxidation and phosphorylation reactions, produce blends with chitosan (CH) and poly (vinyl alcohol) (PVA) and evaluate their physico-chemical and functional properties. The oxidized starch (AOX) had a high degree of substitution…

Nanocomposite Films for Food PackagingFood composition and propertiesAdvanced Cellulose Research Studies

SYNTHESIS AND CHARACTERIZATION OF A MESO-porphyrin DERIVATIVE THE LCC, how to disable METALS: ZINC, COPPER AND NICKEL.

Tássio Lessa do Nascimento2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

NASCIMENTO, T. L. Síntese e caracterização de uma meso-porfirina, derivada do LCC, como desativadora dos metais: zinco, cobre e níquel. 2010. 96 f. Dissertação (Mestrado em Química) - Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2010.

Inorganic and Organometallic ChemistryPorphyrin Metabolism and DisordersPorphyrin and Phthalocyanine Chemistry

Incorporation of mineral phosphorus and potassium on leather waste treatise: a new NcollagenPK-fertilizer with slow liberation

Francisco G.E. Nogueira2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

The leather industry produces a great quantity of solid waste which contains Cr (wet blue leather) with about 30,000 mg Cr kg-1. The patented process Br n. PI 001538 is a technique able to remove the chromium from wet blue leather, with the recovery of a solid collagenic material (collagen), containing low chromium an…

Chromium effects and bioremediationCollagen: Extraction and CharacterizationPhosphorus and nutrient management

Nickel based alloys weld overlay deposited by gtaw cold wire feed: operational and metallurgical aspects

Cleiton Carvalho Silva2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

The weld overlay with nickel-based alloys is an interesting alternative for the construction and repair of equipments for applications in severe corrosive medium, allowing reach the desirable characteristics (corrosion resistance) with a significant reduction of cost. In this context, the GTAW cold wire feed process c…

Metal Alloys Wear and PropertiesMetal and Thin Film MechanicsHigh Entropy Alloys Studies

Characterization of H13 samples nitrided at low pressure with different gasous mixtures

Ricardo Callegari Jacques、Afonso Reguly2010-01-01Lume (Universidade Federal do Rio Grande do Sul)

A nitretação a plasma em baixas pressões e posterior deposição de filmes finos pode aumentar consideravelmente a resistência ao desgaste de matrizes de forjamento feitas de aço ABNT H13. A nitretação promove uma maior sustentação de carga e melhor adesão do filme fino, desde que não ocorra formação de uma camada branc…

Advanced ceramic materials synthesisDiamond and Carbon-based Materials ResearchMetal and Thin Film Mechanics

Characterization of the AWS 317L weld overlay applied by twin wire GMAW on ASTM a516 gr 60 steel used in oil and gas industry

Marcos Henrique de Paula Dias da [UNESP] Silva、Wellington Cordeiro Oliveira、Theophilo Moura. MACIEL 等 5 位作者2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

The aim of this study was to evaluate the metallurgical characteristics of weld overlay applied by Twin Wire GMAW process and the AWS E317L filler metal on ASTM A 516 Gr 60 base metal. During welding it was employed two levels of heat input (H = 1170kJ/m and H = 1530kJ/m) and a mixture of argon and oxygen (95% Ar and…

Additive Manufacturing Materials and ProcessesWelding Techniques and Residual StressesHydrogen embrittlement and corrosion behaviors in metals

Testate amoebae (Arcellinida and Euglyphida) at different biotopes from a lake of the Upper Paraná River floodplain.

Geziele Mucio Alves2010-01-01LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas)

In continental aquatic environments, testate amoebae have been studied at different biotopes, as sediment, aquatic macrophytes and plankton of rivers, reservoirs and lakes. However there are no studies that evaluate the community structure of these protists in these three biotopes within the same environment. Besides…

Protist diversity and phylogenyDiatoms and Algae ResearchAquatic Ecosystems and Phytoplankton Dynamics