Materials Literature
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Abstract Literature covering the problems of oily soil aging on textile materials is reviewed. Difficulty of soil removal and discoloration of oily soiled fabrics were the main problems of aged oily soil reported by researchers. Yellowing of fabrics is attributed mainly to residual oily soils although there are other…
This paper presents the implementation of an isotropic vector hysteresis model within a two dimensional time periodic finite element procedure, formulated in terms of magnetic vector potential. The standard vector Preisach Model is employed and an identification procedure based on the scalar Preisach distribution func…
Microstructural development of silicon nitride doped with Y 2 O 3 and HfO 2 was investigated to determine how extra‐large grains develop during gas pressure sintering. Grains as long as 200 µm and a few tens of micrometers wide developed at high temperatures (>2173 K) in a fine‐grained matrix containing a limited a…
The presence of metallic contamination can seriously reduce the insulation performance of a gas insulated system (GIS). This presentation is focused on the motion of elongated particles, since these particles are considered the ones most frequently found in GIS. The aim of the work has been to learn more about the mot…
The formation of zircon (ZrSiO 4 ) via sintering of milled SiO 2 and ZrO 2 powders was studied, and the effects of slurry vs dry milling, sintering time, and particle size on zircon yield were examined. It was found that very high zircon yields could be obtained via slurry milling, cold pressing, and sintering of the…
We evaluated the generation, radiation, and propagation characteristics of partial discharge (PD) signals in 275 kV full-scale SF/sub 6/ gas insulated transmission line (GIL) model with a length of 168 m. We analyzed the correlation between the PD current pulse and the radiating electromagnetic wave by comparing their…
The electronic structures of Ti(CatNSQ)(2) and Sn(CatNSQ)(2), where CatNSQ(2)(-) is the tridentate radical ligand (3,5-di-tert-butyl-1,2-semiquinonato 1(2-hydroxy-3,5-di-tert-butyl-phenyl)immine), were investigated with density functional (DF) calculations, using the local approximation for the exchange-correlation fu…
We present a detailed experimental investigation of the effect of molecular parameters on the onset of strong slip at the wall for polydimethylsiloxane melts flowing against silica surfaces on which a weak density of polymer chains are anchored by adsorption. The observed variation of the critical velocity for the ons…
Various analyses techniques were employed for characterization of mixed amorphous/crystalline CeO2 supported on SiO2 catalysts prepared by incipient wetness using (i) Ce4+-ammonium nitrate (CeqN) aqueous solution, and by grafting using (ii) Ce4+-methoxyethoxide (CeqA) alcoholic solution. X-ray diffraction (XRD), tempe…
The growth and delamination mechanism of cubic boron nitride (c-BN) film on silicon substrate was investigated with Fourier transform infrared (FTIR) spectroscopy and transmission electron microscopy (TEM). c-BN films were prepared by the helicon wave plasma chemical vapor deposition process on (100) Si. The film depo…
It has been shown that a polymer network, formed in the SmA phase by UV photocure of photocurable liquid crystalline monoacrylates that are doped in a surface-stabilized ferroelectric liquid crystal (SSFLC), eliminates zig-zag defects in the SmC* phase, Since a chevron layer structure is transformed into a quasi-books…
Our investigation uses the film-interference transmittance spectrum in the computer calculation of thin-film thickness t and complex refractive index n*=n-ik. Titanium oxide films of different thicknesses are studied, and a new approach to determine the film thickness and optical constants is proposed. This new approa…
Based on computer simulations in direct as well as in reciprocal space, a geometrical model for the transformation from decagonal Al–Co–Ni to an orientationally twinned crystalline nanodomain structure is derived. Mapping the atomic positions of the quasicrystal onto the corresponding positions of its (4, 6)-approxima…
Highly efficient acentric crystalline materials are sought for applications involving various nonlinear optical (NLO) phenomena. A new series of mainly acentric, crystalline materials based on the non-rod-shaped π-conjugated hydrazone skeleton are presented, along with their molecular and NLO properties and the single…
Losses in power transformer cores can be predicted from knowledge of localised flux distribution within the assembled laminations. This together with a knowledge of the stress sensitivity of the losses of grain-oriented, 3% silicon iron can ideally be used to estimate the total core loss. The localised flux density is…
We apply the classical Preisach model to reproduce the major and minor thermal hysteresis loops in the high-spin /spl rlarr2/ low-spin transition for [Fe(bt)/sub 2/(NCS)/sub 2/]H/sub 2/O and Fe(bt)/sub 2/(NCS)/sub 2/ (bt=2,2'-bi-thiazoline). For this purpose, we consider that spin transition occurs through spin domain…
Electronic absorption and emission spectra are reported for luminescent d(0) monoimido group 5 compounds M(NR)Cl(3)L(2) (M = Nb, Ta; R = alkyl, aryl; L = dme, Cl(-), py). These compounds display weak (epsilon < 200 M(-)(1) cm(-)(1)), well-resolved lowest-energy transitions in the high-energy visible and near-UV region…
The utilization of CF3I in the plasma assisted dry etching of SiO2 has been studied in order to reduce the environmental impact of microelectronics device fabrication. The results show that CF3I is a promising substitute of CF4 in oxide etching since its utilization reduces 3–3.5 times the contribution to the global w…
Two types of new polyurethanes with a highly NLO active chromophore, 2-[4-[4-[bis(2-hydroxyethyl)amino]phenylazo]benzylidene]malonitrile (HAPM), in the polymer side chain were synthesized (PU1-DCN and PU2-DCN) and characterized. The diisocyanate components of the polymers are 2,4-tolylene diisocyanate and 3,3′-dimetho…
Abstract Hydroxyaluminosilicate (HAS) ions were prepared from solutions containing hydroxyaluminum (HyA) ions and orthosilicic acids at an Al concentration of ≈4 m M ; Si/Al molar ratios of 0, 0.25, 0.5, and 1.0; and NaOH/Al molar ratios of 1.0, 2.0, and 2.5. Phosphate retention behavior of montmorillonite (Mt) carryi…