Materials Literature
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Single crystals of lead titanate PbTiO 3 doped with silicon, calcium, chromium, manganese, cobalt, nickel, copper, zinc, and cadmium were grown. The compositions and crystallographic parameters of the crystals were studied. The lowest distribution coefficients of dopants between PbTiO 3 crystals and flux were observed…
Due to its stable performance and less occupied area, SF6gas-insulated apparatuses are rapidly gaining ground in the high-voltage and extra-high-voltage substations. And these SF6gas-insulated apparatuses play a vital role in power systems. Most of insulation failures evolve from early latent insulation faults, which…
In this work, the adhesion properties between different metal films, including Co, Mo, and novel single layer barrier - CoMo alloys with porous low-k dielectrics (k=2.3) have been investigated by using Four-point bending (FPB) tests for the first time. The results show that, Mo has the highest adhesion energy with por…
Abstract In this article, a method for fabricating the patterned liquid crystal photoalignment structures, in a single step, is proposed. A patterned quarter‐wave plate formed by a photoaligned liquid crystalline polymer film is used as a photomask to generate photoaligned micro‐patterns. Whereas other existing altern…
Maintaining the stability of Cassie state under pressure is very important in application for superhydrophobic surfaces. By regarding the water-air part of superhydrophobic interface as a self-adaptive surface, a superhydrophobic interface model was established for column arrays, and the thermodynamic stability of Cas…
Abstract This article focuses on various heat treatment practices recommended for different types of high-speed tool steels. Commonly used methods include annealing, stress relieving, preheating, austenitizing, quenching, tempering, carburizing, and nitriding. The article describes hardening for various types of cutti…
This paper deals with non destructive magnetic evaluation of ground surfaces of variable hardness based on Barkhausen noise (BN) technique. Except magnetic investigation, obtained BN signals are correlated with metallographic observation, microhardness readings as well as residual stress measurements. The results show…
Space charge accumulation characteristics in Epoxy resin with various heat treatments were investigated under DC high stress using as pulsed-electro acoustic (PEA) method. Epoxy resin has been used as sealing material for semiconductor devices. Recently, a new semiconductor like silicon carbide (SiC) has been develope…
Catalysts containing 15 wt % Ni on MgO-Cr 2 O 3 supports with different ratios of magnesium and chromium oxides were prepared. The catalysts were tested in the reactions of partial oxidation and of carbon dioxide and combined reforming of methane into syngas. The phase composition of the catalysts was studied by X-ray…
The butadiyne- and acetylene-linked 3,3′-porphycene dimers 1 and 2 were synthesized from the common intermediate, 3-ethynyl-2,7,12,17-tetrahexylporphycene 4. The butadiyne-linked dimer 1 was prepared from 4 by copper mediated Glaser-type homo-coupling. The acetylene-linked dimer 2 was synthesized by Sonogashira coupli…
— Based on natural ventilation design scheme for an indoor substation, different air distribution schemes were obtained by changing height and size of air inlets and outlets. For indoor substation, three-dimensional simulation of air distribution was conducted by using Computational Fluid Dynamics (CFD) method. Ventil…
the effects of turning on the gradients of micro-texture and grain size of Al alloy 7075 processed by turning is studied. Analytical models based on Boussinesq equation and stress/force transformation, predict that the equivalent von-Mises stress penetrate almost 1 mm below the machined surface with a maximum of 1400…
Comparisons between experiments and simulations of deformation of polycrystalline materials reveal some interesting challenges [1]. Addressing first the image processing issues, electron back-scatter diffraction (EBSD) [2] relies heavily on image transformations of electron diffraction patterns. High energy diffractio…
In this study, the effect of incorporating submicrometric cubic boron nitride (c-BN) in epoxy resin on the respective thermal conductivities and dielectric responses has been investigated. Epoxy composites with c-BN contents of 1 and 5 wt% have been fabricated and compared to neat epoxy. Broadband Dielectric Spectrosc…
In this paper, the stable and good water-soluble polyacrylic acid functioned cerium oxide nanoparticles (CeO2 NPs) were successfully synthesized and characterized by dynamic light scattering (DLS), FT-IR and XPS. The experimental results indicated that the prepared CeO2 NPs exhibit intrinsic peroxidase-like activity,…
The focus of the study presented here is the illite component of the clay mineral components found within gas shale, specifically the creation of robust, atomistic models of illite particles bearing characteristics of the 2M 1 polytype. The template for the illite models is derived from crystallographic data, which is…
Electrical equipment installed in power transmission and distribution lines are usually subjected to abnormal conditions and intense electric fields, which eventually lead, among others phenomena, to partial discharges (PD). These, have been pointed as one of the main causes of equipment failures and premature aging.…
In the present work, we report the structural and optical properties of sol-gel synthesized Zn0.9(Cd1-xMgx)0.1O (0 ≤ x ≤ 1.0) nanostructured films investigated by using the X-ray diffraction, scanning electron microscopy, atomic force microscopy, electrical resistivity, optical absorption and photoluminescence spectro…
We demonstrate a spectrally selective reflector that exploits asymmetric photonic resonances of a 1D photonic crystal. The proposed spectrally selective reflector has a very simple structure - essentially just a single high-index slab of GaN, properly perforated, and supported by a transparent sapphire substrate. With…
X-ray topography and high-resolution diffractometry methods are used for testing GaAs wafers from different manufacturers, which are used as substrates for epitaxial growth in construction of power semiconductor devices. Typical features of such wafers are a distorted surface layer, bent, and growth dislocations with…