Materials Literature
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The effects of compacting methods, heat treatment and chemical additives on the magnetic properties of NdFeB particles have been studied, Five sets of NdFeB powder particles, doped with different amounts of Dy from 0.1-2.9 wt%, were prepared in powder form by gas atomization and annealed at 650-750/spl deg/C for 600 s…
Electrohydrodynamic convection in freely suspended smectic-$C$ ${(S}_{C})$ and smectic-${C}^{*}{(S}_{C}^{*})$ films is investigated experimentally by means of reflection polarizing microscopy. A two-dimensional vortex flow is observed when a dc field is applied in the plane of the smectic layers while the electrodes a…
A generalized fabric bending model is developed based on the nonlinear bending moment-curvature relationship of fabrics. This model makes it possible to theoretically investigate the effects of fabric nonlinear bending behavior on measured bending prop erty values. The dependence of measured parameters (e.g., bending…
Fully dense fine‐grained 32.6‐vol%‐zirconia‐toughened alumina composites have been fabricated from nanocrystalline rapidly solidified material. A model considering the thermodynamics of the constrained t ‐ZrO 2 m ‐ZrO 2 phase transformation was developed for this percolated two‐phase material. This analysis indicated…
A series of poly(o-hydroxyamide)s having high molecular weights were synthesized by means of low-temperature solution polycondensation of 4,4′-[isopropylidenebis(1,4-phenylene)dioxy]dibenzoyl chloride (1) and 4,4′-[hexafluoroisopropylidenebis(1,4-phenylene)dioxy]dibenzoyl chloride (2) with three bis(o-aminophenol)s. S…
We have investigated the dynamics of the process of annihilation of a wedge disclination pair generated in a nematic cell with hybrid alignment, by quenching it from its isotropic phase. The time evolution of the separation between the defect pair can be classified into two stages: the early stage, with a stringlike p…
Zinc-coated (galvanized) and 55% Al-Zn alloy-coated steel sheet was tested for atmospheric corrosion resistance for 20 years in rural (Saylorsburg, Pennsylvania), industrial (Bethlehem, Pennsylvania), moderate marine (250-m [880-ft] lot, Kure Beach, North Carolina), and severe marine (25-m [80-ft] lot, Kure Beach, Nor…
In this paper, the energy dissipation in soft magnetic materials using the dynamic Preisach model is discussed. The main goal is the establishment of the f/sup 1.5/ law for the excess losses from this hysteresis model. By building up the energy balance of a lamination model combined with the dynamic Preisach theory, t…
Charge‐collection (CC) current was measured at a single grain boundary, which exhibited positive temperature coefficient of resistivity (PTCR) effects, in 0.1‐mol%‐Nb‐doped BaTiO 3 . The CC current systematically reversed across the grain boundary above the Curie point, which indicated the presence of a double Schottk…
The role of Ag additions in the microstructural evolution and related mechanical properties of YBCO has been studied. Various amounts of Ag have been added to YBCO by two different mixing techniques, i.e. in the form of metallic Ag powder and solution. The strength and fracture toughness of YBCO specimen increased wit…
A compilation is presented of published experimental and computational reports (191 references) on the structures, vibrational frequencies, molar enthalpies of formation and standard entropies for 26 gas phase boranes for the temperature range from 0 to 1500 K. The thermochemical properties have been collated via stan…
Abstract Some new analogues of the nonlinear optical crystal L-arginine phosphate monohydrate (LAP) (Arg • HIO 3 , Arg • 2HIO 3 , Lys • HIO 3 , Lys • 2HIO 3 , Lys • 3HIO 3 , Bet • 3HIO 3 ) were obtained and investigated by means of IR, NQR, X-ray diffraction and SHG methods. The importance of this class of crystals fo…
In equilibrium liquid dynamics theory, the potential energy surface is supposed to consist of a large number of many-particle nearly harmonic random structural valleys. The passage of the system from one valley to another is a transit, and the transit motion has to be accounted for in order to apply liquid dynamics th…
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…