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Abstract This paper presents procedures to monitor oxidation degradation of two commonly used cable insulations, crosslinked polyethylene (XLPE) and ethylene propylene rubber (EPR). Since the techniques described require only micro specimens, deterioration of cable insulation can be monitored without destroying the fu…
A commercial LiF powder sample was investigated using x-ray photoelectron spectroscopy. Sample preparation included washing in acetone and methanol, pressing into indium foil and gold decoration for charge correction. Measured binding energies were very similar to those previously reported. [See W. E. Morgan, J. R. Va…
The thermodynamic properties of the Yukawa model for colloidal suspensions are determined theoretically from the Rogers-Young integral equation for the fluid phase and from a recently introduced van der Waals--like theory for the solid phases. Very good agreement with the Monte Carlo simulations of Meijer and Frenkel…
Gradient-index filters from Lys & Optik were developed on the basis of an inverse Fourier transformation of the desired spectral characteristics. Filter designs with steep skirts and high reflection are possible because of a new correction method where analytical calculations for rugate structures are used as a basis…
Expressions describing the dynamic behaviour in terms of τ on and τ off for twisted nematic structures have been derived through rigorous analysis. The obtained equations are discussed separately for the twisted nematic (TN) and super twisted nematic (STN) cases. Experimentally obtained switching times under various b…
Abstract Clinotobermorite, Ca 5 Si 6 (O,OH) 18 ·5H 2 O, has been found as a vein-forming mineral in gehlenitespurrite skarns at Fuka, Okayama Prefecture. It is associated with tobermorite, plombierite, apophyllite, and calcite. The clinotobermorite is colourless or white and occurs as tabular or acicular crystals. It…
The temperature dependence of the ac susceptibility, \ensuremath{\chi}' and \ensuremath{\chi}'', was measured in the temperature range from 4.2 to 300 K for various polycrystalline compounds ${\mathit{R}}_{2}$${\mathrm{Co}}_{17}$, with R=Y, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, and Lu and single-crystalline compound…
Abstract X‐ray photoelectron spectroscopy sensitivity factors for elements from lithium to zinc have been determined experimentally using standard compounds. These are found to differ quite considerably from those theoretically calculated using Scofield's photoelectric cross‐sections, but are in good agreement with ot…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed-metal amorphous and spinel phase oxidation catalysts: characterization by x-ray diffraction, x-ray absorption, electron microscopy, and catalytic studies of systems containing copper, cobalt, and manganesePaul A. Wright, Srinivasan Natarajan, John M. Thomas, and Pratib…
A loss model based on a dynamic generalization of the Preisach hysteresis model, in which the standard Preisach algorithm is coupled to an equation for the rate of change of the flux associated with each elementary Preisach loop, is presented. The model is able to predict loss features not explained by previous treatm…
Abstract As shown in previous papers of this series, the main feature of silicas with regard to surface energy, which distinguishes them from carbon blacks, is a low dispersive component, γ s d , and a high specific component, γ s sp , of surface energy. The low γ s d , would result in a lack of interaction between fi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFT-IR spectroscopic investigation of methane adsorption on cerium oxideCan Li and Qin XinCite this: J. Phys. Chem. 1992, 96, 19, 7714–7718Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992https://pubs.ac…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of monolithic binary oxide gels by a nonhydrolytic sol-gel processR. Corriu, D. Leclercq, P. Lefevre, P. H. Mutin, and A. ViouxCite this: Chem. Mater. 1992, 4, 5, 961–963Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Publi…
We have cloned a gene from a Salmonella typhimurium with the ability to complement the rfaC mutation (heptose-deficient lipopolysaccharide, sensitivity to rough-specific bacteriophages, and susceptibility to hydrophobic antibiotics). A 1018-base pair EcoRV-Tth111I fragment, subcloned into the pBluescriptKS+ vector to…
Abstract The fabrication of poly(ethylene terephthalate), PET, into fibers, films, and containers usually involves molecular orientation caused by molecular strain, which may lead to stress‐ or strain‐induced crystallization (SIC). The SIC of PET was studied by the methods of birefringence, density, thermal analysis,…
ABSTRACT The characterization of the fibrillar collagens and the cellular control of their spatial deposition were studied in fish scales using immunofluorescence, electron microscopy, electrophoretic and HPLC analyses, immunoprecipitation and hybridization with cDNA probes. This study was carried out on undisturbed a…
We describe a new method for determining the real and imaginary parts of the material constants of piezoelectric resonators. Our method is applicable to any of the common resonator geometries, it is non-iterative and its accuracy is comparable to that of other methods which are currently in use.
Current transients due to evolution of metastable corrosion pits on stainless steel in chloride solution are shown to be preceded by sharp current spikes. These current spikes are measured in the picoampere regime and represent microscopically violent nucleation events. Not all nucleation events survive to produce met…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn explanation of anomalous dielectric relaxation properties of polypropylene glycolK. L. Ngai, A. Schoenhals, and E. SchlosserCite this: Macromolecules 1992, 25, 19, 4915–4919Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published i…
Effects of the concentration of ZrOCl 2 , calcination temperature, heating rate, and the size of secondary particles after hydrolysis on the preparation of high‐purity ZrSiO 4 fine powders from ZrOCl 2 .8H 2 O (0.2 M to 1.7 M ) and equimolar colloidal SiO 2 using sol–gel processing have been studied. Mechanical proper…