Results 11 to 20 of about 1,212 (136)
IET Power ElectronicsThe occurrence of voltage variations caused by the input/output of large loads and/or transmission lines, as well as faults and high levels of photovoltaic‐based distributed energy resource (DER) penetration, impairs power quality indicators at the power
Matheus B. Soares +4 more
doaj +2 more sources
Influence of Drying Protocol on the Setting and Crystalline Phase Formation of Calcium Silicate-Based Sealers. [PDF]
Aust Endod JABSTRACT The objective of this study was to assess the hydration, crystalline structure, and setting of bioceramic ready‐to‐use and powder/liquid sealers in dry and wet root canal dentine. Thirty‐two single‐rooted human teeth were embedded in acrylic resin and sectioned into 2‐mm segments.
Antunes TBM +8 more
europepmc +2 more sources
IET Microwaves, Antennas &Propagation, Volume 17, Issue 7, Page 547-557, June 2023., 2023 This study proposes an analytical formulation in complex coordinates to synthesise three‐dimensional single‐shell dielectric lens surfaces. An exact formulation based on geometrical optics is developed, and the synthesis problem is modelled as a non‐linear second‐order partial differential equation of the Monge–Ampère type. Abstract This study proposes
Aline Rocha de Assis +2 more
wiley +1 more source
Application of the Base Transceiver Station with Smart Antennas in the Power Distribution Sector
International Journal of Antennas and Propagation, Volume 2021, Issue 1, 2021., 2021 The use of distribution automation systems has grown significantly in electricity companies in recent years. The main reason for this is the need to have a smarter network, in order to reduce the time of power interruption. For such applications, communication using radio frequency is preferred because this solution is more reliable than 3G/4G and ...
B. A. Kleinau +7 more
wiley +1 more source
Scalar Pulse Width Modulation Strategies For Matrix Converters
Eletrônica de Potência, 2007 This paper describes three different scalar pulse width modulation (PWM) techniques for matrix converters to be compared to two other scalar techniques proposed here.
A. G. H. Accioly +5 more
doaj +1 more source
Proposal Of A Hysteresis Controller With Constant Switching Frequency
Eletrônica de Potência, 2005 This paper introduces a new control technique for power factor correction in ac-dc converters. It has the advantages of conventional hysteresis control strategy and the prominent characteristics PWM control, since the limits of the hysteresis band can be
Marcos Tadeu Galelli +6 more
doaj +1 more source
Eletrônica de Potência, 2019 Dentre os distúrbios que afetam a qualidade de energia elétrica, destaca-se a distorção nas formas de onda de tensão e corrente, causada pelas componentes harmônicas de corrente consumidas por cargas não-lineares e desbalanceadas conectadas à rede ...
Lauro C. Q. M. Silva +3 more
doaj +1 more source
Análise Comparativa De Inversores Multiníveis Monofásicos Baseados Em Células De Comutação
Eletrônica de Potência, 2013 Este artigo apresenta a análise comparativa para operação em regime permanente de três inversores multiníveis monofásicos, com grampeamento do ponto neutro (NPC – Neutral Point Clamped), baseados em células de comutação.
João A. F. Neto +2 more
doaj +1 more source
Eletrônica de Potência, 2017 Este trabalho propõe a utilização de um controle repetitivo para restaurar de forma dinâmica a tensão em cargas sensíveis conectadas à rede elétrica.
João Raphael de Souza Martins +3 more
doaj +1 more source
Conversor Cc-cc Elevador/Abaixador Zvzcs Pwm com Grampeamento Ativo
Eletrônica de Potência, 2012 Este artigo apresenta o conversor CC-CCbidirecional em corrente (Elevador/abaixador) com comutação suave ZVZCS (zero voltage zero current switching) e grampeamento ativo, utilizando um único interruptor auxiliar.
Rafael Luís Klein +4 more
doaj +1 more source