Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Maria Virginia Gelfuso"'
Publikováno v:
Materials Research, Vol 26 (2023)
Ca3Co4O9 powders and ceramics were synthesized and sintered using microwave-assisted heating method.Another batch of powders was calcined by the conventional heating method and this powder was used to produce ceramics sintered by microwave sintering
Externí odkaz:
https://doaj.org/article/daabf7fffadf49cfaf0231789b6f6393
Publikováno v:
Materials Research, Vol 18, Iss suppl 2, Pp 265-272 (2015)
Surface treatments done in banana fibers (BFs) can generate significant superficial structural changes enabling the production of mechanically stronger composites. In this way, the objective of this study was to evaluate the physicochemical and mecha
Externí odkaz:
https://doaj.org/article/71d1b5b3ea574c3d86f51ec49ded34b3
Autor:
Maria Virginia Gelfuso, Daniel Thomazini, Júlio César Silva de Souza, José Juliano de Lima Junior
Publikováno v:
Materials Research, Vol 17, Iss 2, Pp 367-372 (2013)
Many researchers have been studying coconut fibers due to its being a natural and renewable source. Moreover, coconut waste is discarded in landfills, bringing environmental problems because this material, although natural, takes time to be degraded.
Externí odkaz:
https://doaj.org/article/faaf0a0abf944711afa85002547f263f
Publikováno v:
Materials Research, Vol 15, Iss 3, Pp 365-371 (2012)
Although the hydrophobicity is usually an arduous parameter to be determined in the field, it has been pointed out as a good option to monitor aging of polymeric outdoor insulators. Concerning this purpose, digital image processing of photos taken fr
Externí odkaz:
https://doaj.org/article/7f058c54c23e45efad592d1e035e26f8
Publikováno v:
Materials Research, Vol 14, Iss 3, Pp 360-365 (2011)
Polypropylene matrix composites reinforced with treated coconut fibers were produced. Fibers chemically treated (alkalization-CCUV samples) or mechanically treated (ultrasonic shockwave-CMUV samples) were dried using UV radiation. The goal was to com
Externí odkaz:
https://doaj.org/article/b84272aac1b44bc2b7c95920a863ad69
Publikováno v:
Materials Research, Vol 11, Iss 4, Pp 415-419 (2008)
This study proposes a new method to obtain hydrophobicity classification (HC) in high voltage polymer insulators. In the method mentioned, the HC was analyzed by fractal dimension (fd) and its processing time was evaluated having as a goal the applic
Externí odkaz:
https://doaj.org/article/f87989396e994cf9bac26e044ea41ced
Autor:
Daniel Thomazini, Maria Virginia Gelfuso, Tereza Águida Costa do Nascimento, Emanuel Frota Fonteles
Publikováno v:
Revista Tecnologia, Vol 25, Iss 1 (2009)
O alto índice de pessoas que necessitam de uma órtese pode ser constatado nos vários segmentos de atendimento de saúde, em todo o país, e, não tem sido diferente no Núcleo de Assistência Médica Integrada (NAMI)/UNIFOR. O alto custo dos mate
Externí odkaz:
https://doaj.org/article/27200b8b35f64571a31e7c186a0c1538
Publikováno v:
Revista Tecnologia, Vol 29, Iss 1 (2009)
Neste trabalho é proposto o Controle Preditivo Generalizado (GPC) com três passos a frente e outro Proporcional Integrativo Derivativo (PID) para uma planta pequena, utilizando um algoritmo de mínimos quadrados estendido para a identificação da
Externí odkaz:
https://doaj.org/article/37d10643b1764b3abb2fcdb52cf7a01e
Publikováno v:
Revista Tecnologia, Vol 28, Iss 2 (2009)
Cerâmicas de titanato de bismuto-estrôncio (SBT) dopadas com 4 % em mol de MnO2 (SBT+Mn) ou Nd2O3 (SBT+Nd) foram produzidas através do método convencional de mistura de óxidos. As propriedades estruturais, dielétricas e piezoelétricas foram c
Externí odkaz:
https://doaj.org/article/bb2d114f076249f5acec5a51cf9656e5
Publikováno v:
Revista Tecnologia, Vol 29, Iss 1 (2009)
This work proposes a Generalized Predictive Control (GPC) with three steps ahead for plant controller and Proportional Integrative Derivative (PID) control, using the Extended Least-Squares algorithm for the plant identification. As a result we have
Externí odkaz:
https://doaj.org/article/709b93ed089545cd933016bfc406f971