Materials Literature
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Abstract Acrylamide and acrylonitrile were polymerized with water‐soluble organic reducing compounds containing hydroxy groups such as methyl cellulose (MC), methyl hydroxy‐propyl cellulose (MHPC) and poly(ethylene glycol)s (PEG) in the presence of Ce(IV) in order to produce graft/block copolymers. The effect of ceriu…
The /spl delta/M curves predicted by the vector Preisach model are analyzed and proved to always be negative. A mean interaction field parallel to the magnetization is added to the model so as to reproduce the positive /spl delta/M curve of barium ferrite particulate media. By using this model in self consistent field…
The structure of a vehicle surrounding the occupant compartment is designed to crush in an accident in order to limit the forces that are transmitted to its occupants. Crush initiators are stress concentrations that are incorporated into automobile frame members to ensure a stable collapse process and to limit peak lo…
Vacuum brazing of A5000 (Al-Mg) series and A6000 (Al-Mg-Si) series aluminum alloys are considerably difficult because of their rather high magnesium contents. For the purpose of sound and high strength brazing of these materials, a series of Al-Ge-Si-Mg system based filler metales was developed by the authors. Evaluat…
The crystallization of high purity amorphous polymer-derived Si3N4 fiber, which was heat-treated with and without BN powders, was investigated. In the case without BN powder, the crystallization proceeds by vapor phase growth mechanism through SiO gas. The activation energy of 602kJ/mol was calculated. In the case wit…
Silicon carbide ceramics are candidate materials for use in aggressive environments, including those where aqueous acids are present. Standard corrosion testing methods such as immersion testing are not always sufficiently sensitive for these ceramics owing to the very low, almost unobservable, corrosion rates encount…
In this investigation a stable high manganese austenitic steel, 0.45C-17Mn-2.8Al, has been studied for hydrogen embrittlement using cathodically precharged specimens. Tensile testing of axisymmetric and plane strain specimens precharged with hydrogen show an appreciable loss of 8-10% reduction in area (RA) whereas the…
The crystal structure of a unique cholic acid inclusion compound with acetone and water guests exhibiting extensive hydrogen bonding is reported and the phases formed during decomposition identified by thermal analysis and X-ray powder diffraction.
The porphyrin boronate H2L2 undergoes Suzuki cross-coupling reaction with β-monobromoporphyrin H2L1 to give the unsymmetrically substituted porphyrin dimer H4L3 in high yield; homo-, and heter-bimetallic complexes of H4L3 are prepared.
The long duration mechanical strength of rods used in composite insulators is a major problem for the line designer. The previous approach to the problem and the requirements of standards give an extrapolation for the long term performance of the rod which is not confirmed by accurate analysis of test results. So, a n…
As a normal part of reactor operation, Zircaloy components in the core of boiling water reactors (BWRs) are subjected to oscillating loads. It then becomes important to assess the fatigue behavior of core materials. These include Zircaloy-2 used as fuel cladding, zirconium used as liners in barrier fuel, and Zircaloy-…
Summary not available.
The structure of alkaline earth vanadate glasses, xMO⋅(100-x)V2O5 (M=Ca, Sr, Ba, x=30, 40, 45, 50, 55), has been investigated by means of 51V static and magic angle spinning (MAS) NMR spectroscopies. The 51V NMR spectral parameters of various constituent vanadate groups contained in the vanadate glasses were determine…
Magnetic and magneto-optical properties, Kerr rotation angle, Kerr ellipticity and reflectance, were investigated for Pt substituted MnSb compound films with film thickness of about 1000 /spl Aring/ by RF sputtering in the concentration range of 44 at%>
The polymorphism of a novel and orally effective uricosuric agent, [3-(4-bromo-2-fluorobenzyl)-7-fluoro-2,4-dioxo-1,2,3,4-tetrahydro-quinazolin-1-yl] acetic acid, designated as FR76505, was characterized by X-ray powder diffractometry and thermal analysis. In the crystalline state, FR76505 exists in at least three pol…
The microstructural characteristics of quasicrystalline and related crystalline phases in rapidly solidified Al[sbnd]5 to 20 at% Fe alloys have been investigated by detailed transmission electron microscopy. Rapid solidification of Al[sbnd]5 to 20 at% Fe alloys produces a variety of metastable phases, depending upon a…
High-refractive-index glasses of heavy-metal oxides have large optical non-linearities which make them promising for optoelectronic applications. This paper describes the fabrication and characterization of the xBi2O3–PbO–B2O3–(52–x)GeO2(BPBG) glass system with x= 10, 15, 20, 30 and 35. The BPBG glasses were melted in…
In this work three types of the surface formate, ionic, monodentate and bidentate species, are identified to be the main products of formic acid adsorption on Cu, CuCl, Cu2O and CuO at room temperature. Combined thermal analysis [differential thermal analysis (DTA), thermogravimetry (TG) and evolved gas analysis (EGA)…
A novel, highly active, supported liquid-phase, rhodium catalyst for acetylene hydrochlorination for mercury free production of vinyl chloride is described.
A frequency dependent resistance model for the representation of eddy current losses in the windings of three-phase, two or three windings, transformers is presented. It consists of a low order R, L Foster circuit connected in series with any existing transformer model to produce the realistic damping that results fro…