Materials Literature
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Removal of pyruvic acid from water has been studied through catalytic ozonation. Copper or cobalt impregnated MCM-41, Ru-Al2O3, Ru-CeO2, FeO(OH) and LaTi1-xCuxO3 and LaTi1-xCoxO3 Perovskites have been used as catalysts. Only perovskites and Ru-CeO2 catalysts did show significant catalytic activity to increase the ozon…
Grain refined microstructure is often obtained spontaneously in the solidification of metals and semiconductors from the undercooled melt without any external forces. Although it has been reported that the grain refinement is mainly caused by the fragmentation of the dendrites, the dynamic process of the fragmentation…
O objetivo deste trabalho foi avaliar a utilização de fibras (epicarpo) de babaçu (Orbignya spp) em combinação com partículas de Pinus elliottii em diferentes proporções na confecção de chapas de madeira aglomerada, bem como avaliar o efeito de dois teores de adesivo à base de uréia-formaldeído. As chapas foram prensa…
Surface of a metal or material is important and suitable modification of the surface can provide enhanced properties for different applications. Magnesium is the lightest of all structural metals. Its low density (1·8 g cc −1 in alloy form) coupled with favourable casting properties, makes magnesium the material of ch…
The yarn samples prepared for migration study were tested for tensile properties. Furthermore, the effect of drafts of the spinning machines on yarn strength and breaking elongation (%) was studied. The effect of spinning position, doff position and material conditioning during testing on yarn tensile properties were…
TheRajendran-Grove (RG) ceramic damage model is athree-dimensionalinternal variablebased con- stitutive model for ceramic materials, with the consider- ations of micro-crack extension and void collapse. In the presentpaper, the RG ceramic model isimplemented into the newly developed computational framework based on th…
Abstract Ordered mesostructured silica monoliths (OMSMs) were prepared and after synthesis processed by a deep-UV irradiation to selectively oxidize their surfactants, and the UV-treated monolith exhibited a proton conductivity of 9.1 × 10−3 S cm−1, much higher than that of the calcined monolith, via the first investi…
This paper presents the supercapacitor characterization for hybrid vehicle applications. This characterization takes into account frequency, voltage and temperature variations. The frequencies dependence is mainly caused by the dynamics of the ions in the electrolyte. With high frequencies, the ions do not have time t…
Quite recently, we have demonstrated that mechanical milling NaH∕Al mixture with metallic Ti powder resulted in the formation of catalytically active Ti hydride. In the present study, the morphology and the distribution state of the catalytically active Ti hydride and the parent phases of the as-prepared and cycled sa…
Noncovalent interactions between an artificial molecular scaffold and a protein are interesting due to the possibility of reversible modulation of the activity of the protein. alpha-Chymotrypsin is a positively charged protein that has been shown to interact with negatively charged polymers. Here we show that positive…
High-resolution spectral hole-burning studies of CdSe/ZnS core/shell nanorods reveal a sharp zero-phonon line, with a line width dependent on the measurement time scale. The zero-phonon line width is attributed to contributions from radiative decay, spectral diffusion induced by surface electric field fluctuations, an…
A model calculation on optical gain and co-stimulated emission of photons and phonons in indirect bandgap semiconductors such as silicon is presented. An analytical expression for optical gain via phonon-assisted optical transitions in indirect bandgap semiconductors is presented. Population inversion can occur when t…
Laser cladding is an additive manufacturing process in which a laser generates a melt pool on the substrate material while a second material in a powder or wire form is injected into that melt pool. Among all laser manufacturing processes, laser cladding offers the most extensive variety of possibilities to alter a co…
Strontium-modified lead zirconate titanate Pb1−xSrxZr0.52Ti0.48O3 [(PSZT) x=0.2–0.8] thin films were prepared on Pt∕TiO2∕SiO2∕Si substrates by the sol-gel method. The Curie temperature of PSZT films decreases with the increase of Sr contents and paraelectric PSZT films at room temperature are demonstrated as x approac…
With advantages of high specific strength, low elastic module, good damping property et al., the magnesium alloys exhibit great potential applications in aerospace. But poor wear behavior results in limited use of magnesium alloy to static components. In this study, a 2 μm thick coating with 12 sub-layers of CrN and T…
The effect of the amplitude of vibrational deformation on the elastic modulus and internal friction of microcrystalline aluminum samples produced by equal-channel angular pressing was studied. The samples have various deformation and thermal histories. The elastic and inelastic (microplastic) properties of the samples…
Au ∕ Tb Mn O 3 ( TMO ) ∕ Y Ba 2 Cu 3 O 7 − x ( YBCO ) capacitors were fabricated on LaAlO3 (LAO) and SrTiO3 (STO) substrates under identical conditions. Dielectric properties were measured in the temperature range from 20to350K. High dielectric constants and single dielectric transition peaks were found in both TMO fi…
Online monitoring of high voltage (HV) cross linked polyethylene (XLPE) cables is a major requirement and interest of utilities for reliable operation of underground cables. Although XLPE cables have a relatively reliable insulation system, however since its insulating material is less resistant to partial discharges…
The term glauconite covers a series of iron-rich minerals that form in the upper layer of sediments of the sea bottom in locations where sediment input is low. Because of its potassium content and the process of its formation, it is one of few minerals that can be used in both sequence stratigraphy and in the determin…
Water absorption behavior of Biopol® and jute-reinforced Biopol composites has been studied by adopting the CCD camera based digital neutron radiography technique. The surface of jute is pretreated with 2-hydroxyethyl methacrylate (HEMA) before composite fabrication. From the analysis of neutron transmission profile m…