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Diffuse and localized failure predictions of Perzyna viscoplastic models for cohesive-frictional materials
(Planta Piloto de Ingeniería Química, 2002-12)
Viscoplastic constitutive formulations are characterized by instantaneous tangent operators which do no exhibit degradation from the elastic properties. As a consequence Viscoplastic materials descriptions were often ...
Dielectric Behavior of alpha-Ag2WO4 and its Huge Dielectric Loss Tangent
(Univ Fed Sao Carlos, Dept Engenharia Materials, 2019-01-01)
The microwave-assisted hydrothermal method was used to obtain alpha-Ag2WO4. Rietveld refinement confirmed that alpha-Ag2WO4 is stable in the orthorhombic phase, without secondary phase. However, field-effect scanning ...
Complex Dielectric Permittivity of Engineering and 3D-Printing Polymers at Q-Band
(Springer New York LLC, 2018)
We report experimental values of the complex dielectric permittivity of a wide variety of engineering polymers. Measurements were done using the filling waveguide method at Q-band (30–50 GHz), being representative of the ...
Desenvolvimento de circuitos planares sobre substratos têxteis
(Universidade Federal do Rio Grande do NorteBRUFRNPrograma de Pós-Graduação em Engenharia ElétricaAutomação e Sistemas; Engenharia de Computação; Telecomunicações, 2014-04-28)
The use of flexible materials for the development of planar circuits is one of the
most desired and studied characteristics, lately, by researchers. This happens because
the flexibility of the substrate can provide previously ...
Low amplitude oscilatory determinations for suero costeñoDeterminaciones oscilatorias de baja amplitud del suero costeño
(Universidad de Ciencias Aplicadas y Ambientales U.D.C.A, 2012)
About the measurement of dynamic mechanical properties of bi-layer systems
(Elsevier Science Sa, 2004-12)
The bi-layer system has been well developed for many engineering structural components in the aircraft, automotive, microelectronics and modern space industries in the last few decades. Consequently, a good determination ...
Síntese de ferritas de cobalto e níquel dopadas com zinco e caracterização de suas propriedades eletromagnéticas
(Universidade Federal do Rio Grande do NorteBrasilUFRNPROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIA E ENGENHARIA DE MATERIAIS, 2015-10-26)
This work shows that the synthesis by combustion is a prominent alternative to obtain ceramic powders of higher oxides, nanostructured and of high purity, as the ferrites of formulas Co(1-x)Zn(x)Fe2O4 e Ni(1-x)Zn(x)Fe2O4 ...
Bifurcaciones básicas y formas normales
(2010)
Se analizan las características fundamentales de las bifurcaciones locales por pérdida de hiperbolicidad sobre puntos de equilibrios para sistemas 1-paramétricos continuos unidimensionales y bidimensionales, como son las ...
BisGMA/TEGDMA ratio and filler content effects on shrinkage stress
(ELSEVIER SCI LTD, 2011)
Objective. To investigate the contributions of BisGMA:TEGDMA and filler content on polymerization stress, along with the influence of variables associated with stress development, namely, degree of conversion, reaction ...