Materials Literature
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The life expressions of models of insulation aging are functions of temperature and field as well as material parameters. A methodology is presented that allows these models to be applied to a cable geometry in which there is a radial variation of both field and temperature. In this way material parameters can be extr…
The formation and application of nanoscale materials is revolutionising many industrial sectors. The unique properties and functionality offered at this length scale are attractive and the demand for new materials and new production routes is high. This challenging field of research incorporates materials science, eng…
Abstract Orthorhombic Tb 3 O 2 Cl[SeO 3 ] 2 (Pnma; a = 535.16(4), b = 1530.51(9), c = 1081.72(7) pm; Z = 4) is formed by reacting a stoichiometric mixture of Tb 4 O 7 , Tb, TbCl 3 , and SeO 2 in a suitable molar ratio (12 : 8 : 7 : 42) within seven days in an evacuated sealed silica tube at 850 °C. The needle‐shaped,…
We describe high-efficiency, high-dispersion reflection gratings fabricated in bulk fused silica illuminated by incident lights in the C + L bands as (de)multiplexers for dense wavelength division multiplexing (DWDM) application. Based on the phenomenon of total internal reflection, gratings with optimized profile par…
ABSTRACT Atomic layer epitaxy (ALE) was applied to grow thin films of monocrystalline and polycrystalline ZnO. Monocrystalline films were obtained only for GaN/Al2O3 substrates, whereas use of sapphire, silicon or soda lime glass resulted in either 3D growth mode or in polycrystalline films showing preferential orient…
The influence of chloride ions on the corrosion of AZ91 magnesium alloy in water/ethylene glycol solutions and the inhibiting effect of lactobiono-tallowamide (LTA) were investigated using electrochemical and surface analysis methods. Potentiodynamic polarization curves in aqueous solution of ethylene glycol (50:50w%)…
This study examines the effect of alloying elements of Ni and W on the repassivation properties of stainless steel (SS) as evaluated by a rapid scratching electrode technique and stress corrosion cracking (SCC) test. The SS specimens were grouped into two different grades according to Ni content (22Cr-5Ni duplex, Type…
Gapless metal oxide surge arresters (MOSA) have been available in the market for many years since they were first introduced in the 1970's. The aim of this study is to investigate some reliable diagnostic techniques to assess the condition of a metal oxide surge arrester when subjected to severe lightning strikes in t…
The domain structure of ferroelectrics changes during poling has a direct influence on the macroscopic properties of the materials. The intensity variation of the different X‐ray diffraction (XRD) pattern profiles was used to identify the percentage of 90° domain reorientation in the tetragonal phase of Pb(Mg 1/3 Nb 2…
Abstract The present work deals with the synthesis of Na-A zeolite using 10 Å halloysite (collected near Grosseto, Italy) as the starting material, instead of the more expensive chemicals currently used in industry (Na aluminates and Na silicates). The process of synthesizing Na-A zeolite from 10 Å halloysite is rathe…
Abstract In this work, structural features and optical properties of CuPcF 16 films deposited by physical vapour deposition have been investigated. Thin films of two different thicknesses (22 and 198 nm) were characterized by ellipsometry, optical absorption spectroscopy and scanning electron microscopy. Film morpholo…
The antifungal activity of a crude steroidal glycoside extract from Yucca gloriosa flowers, named alexin, was investigated in vitro against a panel of human pathogenic fungi, yeasts as well as dermatophytes and filamentous species. The minimal inhibitory concentration (MIC) was determined by an agar dilution method. A…
Transcription of the hupSL genes, which encode the uptake [NiFe]hydrogenase of Rhodobacter capsulatus, is specifically activated by H(2). Three proteins are involved, namely the H(2)-sensor HupUV, the histidine kinase HupT and the transcriptional activator HupR. hupT and hupUV mutants have the same phenotype, i.e. an…
We present a model of radiation-induced segregation (RIS) at the grain boundary (GB), treating both segregation produced by interstitials and segregation due to vacancies. Predicted kinetics of RIS in austenitic steels reveal how thermodynamic properties control the formation of a transient ‘W-shaped’ profile, the osc…
Transmittance characteristics were studied as a function of cell gap for a homogeneously aligned liquid crystal (LC) cell driven by a fringe‐electric field—named fringe‐field switching (FFS) mode. The light efficiency of a conventional LC cell using in‐plane switching and twisted nematic modes, where the LC director i…
Abstract Polycrystalline LaMn 2 O 5 has been studied by neutron powder diffraction in conjunction with magnetization data. The crystal structure of this oxide contains infinite chains of edge‐sharing Mn 4+ O 6 octahedra, interconnected by Mn 3+ O 5 pyramids and LaO 8 units. Susceptibility measurements show that LaMn 2…
The objective of this work was to develop a model to describe pipeline corrosion within a disc-shaped crevice in the presence of oxygen (O2). The model results from modification of the pipeline crevice corrosion model (PCCM) previously developed for pipeline corrosion in a rectangular crevice. The present study compar…
An iron sulfate of nominal composition Fe 2 (SO 4 ) 3 (H 2 O) 5 has been synthesized and its structure determined and refined by high resolution powder diffraction using synchrotron radiation. The structure consists of corrugated slabs in which iron octahedra are linked by sulfate tetrahedra in the monoclinic space gr…
A uniform BaTiO 3 nano layer was coated on spherical Ni particles for multilayer ceramic capacitor applications via a Ti‐hydroxide coating using the controlled hydrolysis of a TiCl 4 butanol solution containing (C 2 H 5 ) 2 NH (diethylamine, DEA) and its subsequent hydrothermal reaction at various [Ba(OH) 2 ], residua…
Aniline was selectively converted into the corresponding nitrosobenzene and nitrobenzene by oxidation with 30% aqueous hydrogen peroxide. The reaction was catalyzed by various heteropolyoxometalates, at room temperature, in dichloromethane under two-phase conditions. Findings show that H3PW12O40 is the best catalyst i…