Transformer
Mostrando 1-12 de 184 artigos, teses e dissertações.
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1. A Selective Gas Chromatography-Selected Ion Monitoring Mass Spectrometry (GC-MS/SIM) Method to Determine Polychlorinated Biphenyls in Fuller’s Earth
Polychlorinated biphenyls (PCBs) are carcinogenic to humans and can be found in Fuller’s earth used for the regeneration of used transformer oil. This work describes a highly selective gas chromatographic-selected ion monitoring mass spectrometric method (GC-MS/SIM) for the simultaneous determination of three Aroclor PCB congener mixtures (1242, 1254, and
J. Braz. Chem. Soc.. Publicado em: 2020-03
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2. Risk management during construction of electric power substations
Resumo A construção de subestações de energia elétrica representa um grande número de riscos devido ao seu ambiente periculoso. O objetivo deste trabalho foi avaliar a percepção dos trabalhadores da construção civil sobre os riscos, os métodos que utilizam para avaliação e o gerenciamento dos riscos a que estão expostos. Este estudo realizou um
Gest. Prod.. Publicado em: 17/10/2019
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3. Effect of iodonium salt and chitosan on the physical and antibacterial properties of experimental infiltrants
Abstract Resinous infiltrants are indicated in the treatment of incipient carious lesions, and further development of these materials may contribute to greater control of these lesions. The aim of this study was to analyze the physical and antibacterial properties of experimental infiltrants containing iodonium salt and chitosan. Nine experimental infiltrant
Braz. oral res.. Publicado em: 15/08/2019
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4. A 50Ω Microstrip Line Fed Shorted Hexagonal Microstrip Antennas with Reduced Cross-Polarization
Abstract A Hexagonal Microstrip Antenna (HMSA) is an approximation to a Circular MSA (CMSA), which is not symmetrical over two principal planes, unlike a CMSA. Consequently, two types of feed positions are feasible for each X and Y-axes. When a quarter-wave transformer or inset feed is used to match the edge impedance of the HMSA, it becomes asymmetrical ove
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019
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5. Comparative study between natural and synthetic Hydroxyapatite: structural, morphological and bioactivity properties
ABSTRACT In this work, a study of hydroxyapatite (HAp) powders obtained using both, porcine bones and chemical precursors was carried put. In the case of HAp obtained by means of porcine bones, physical processes as cooking, washing and milling were developed, for removing the organic material from the bones; after that, the powders were submitted to a therm
Matéria (Rio J.). Publicado em: 06/12/2018
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6. Characterization of grid-connected photovoltaic systems in Curitiba, Brazil
ABSTRACT In the search for new options for the establishment of the energy matrix of Brazil, the Grid-Connected Photovoltaic Systems (GCPVS) are configured as an alternative to urban centers, because they allow the power generation at distributed mode, that is, generate energy at the place where it will be consumed and inject the surplus energy into the netw
Braz. arch. biol. technol.. Publicado em: 29/10/2018
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7. Microconcreto de alto desempenho: propriedades e comportamento de pilar à flexão normal composta
RESUMO O microconcreto de alto desempenho é um material que possui dimensão máxima de agregado reduzida e baixa relação água/aglomerante (a/aglm). Com o objetivo de verificar a aplicabilidade em elementos estruturais, estudou-se o comportamento do material e de um pilar executado com microconcreto de alto desempenho. Como referência, estudou-se outro
Matéria (Rio J.). Publicado em: 18/10/2018
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8. Effect of Spun Velocities and Composition on the R‒phase and Thermomechanical Behavior in Ti‒Ni Ribbons Electrically Heated
This work deals with structural, electrical and mechanical characterization of Ti‒50.13Ni and Ti‒49.62Ni (at.%) shape memory alloys (SMAs) fabricated at different circumferential wheel velocities. The effect of wheel velocity, chemical composition and heat treatments are investigated. The characterization of crystallographic phases of the Ti‒Ni ribbons
Mat. Res.. Publicado em: 08/04/2016
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9. DEVELOPMENT OF INSULATING MAGNETIC OIL FOR TRANSFORMERS
The Centrais Elétricas do Norte do Brasil AS – Eletronorte, as well as other companies in the world energy sector, have problems of loss of the performance by excessive heat and even accidents with their transformers. The maintenance and accidents impact of energy supply, generating profit and more expensive insurance premiums. The transformers are essent
Publicado em: 20/07/2014
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10. Characterization of the complex metal-clay obtained in the process of lead adsorption
This study aims to characterize the complex metal-clay formed by adsorption of lead. In this work, the bentonite clay named Fluidgel was calcined at 750 ºC and was used as adsorbent for lead removal. The characterization of this clay and complex metal-clay was carried out by X-ray diffraction (XRD), Fourier transformer infrared spectroscopy (FTIR), surface
Mat. Res.. Publicado em: 11/03/2014
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11. Wound rotor doubly fed induction machine with radial rotary transformer
This paper shows a wound rotor doubly fed induction machine in which the typical brushes and slip-rings are substituted by rotary transformers. The advantages of rotary transformer usage, the doubly fed induction machine operation and the dimensioning of a radial rotary transformer are the main aspects presented in this study. The use of analytical equations
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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12. A systematic sensitivity analysis of the performance of a transcutaneous energy transmitter for design purposes
This work studies a Transcutaneous Energy Transmitter (TET) which uses electromagnetic fields to transfer power from outside the body to an artificial organ in the body, working like a high frequency transformer with the skin being part of the magnetic coupling between the primary (external coil) and secondary (internal coil). For this reason, this project m
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12