Materials Literature
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Point defects were found in as‐quenched GeO 2 , 65CaO35Al 2 O 3 , and 65SrO35Ga 2 O 3 glasses on the basis of electron paramagnetic resonance (EPR) measurements. These defects were identified as Ge É centers in GeO 2 glass and O ‐ 2 , O ‐ 3 , and M‐OHC (oxygen hole center) (where M = Al, Ga) in 65CaO35Al 2 O 3 and 65S…
Perfluoroalkyl-substituted benzothiazolyl bisazo dyes showed higher solubility and greater bathochromicity than the corresponding alkyl derivatives. These dyes showed good dichroism (order parameter S>0.75).
Abstract Polymerisation conditions have a remarkable effect on the various material properties of polypyrrole. Care has to be taken to ensure identical conditions for electrochemical experiments when films electropolymerised differently are examined in comparison. The effect of a variety of experimental parameters on…
Photo electrochemical current response of passive film was investigated for pure Cr and Fe-xCr (x = 8, 14, 18) alloys polarised potentiostatically in 0.1 kmol.m -3 H 2 SO 4 solution. Photo electrochemical action spectrum could be separated into two or three constituents. These components were considered to be derived…
Summary The cellular anatomy of the green alga, Chara corallina, was exploited to isolate putative plasmodesmataassociated proteins. In C. corallina , large internodal cells are symplastically connected via intervening nodal complexes of smaller cells which have plasmodesmata in their cell walls. Comparison of protein…
The effectiveness of chlorinated polyethylene-graft-polystyrene (CPE-g-PS) as a polymeric compatibilizer for immiscible poly(vinyl chloride)/polystyrene (PVC/PS) blends was investigated. The miscibility, phase behavior, and mechanical properties were studied using differential scanning calorimetry (DSC), dynamic mecha…
Vascular prostheses coated with collagen carefully prepared to avoid contamination were tested to see if it could induce endothelial cell lining throughout the graft surface in a natural way. The collagen fibers were succinylated. Hydrogel produced with the succinylated collagen was used for the sealant to reduce the…
A series of new soluble aromatic polyimides with inherent viscosities of 0.65–1.12 dL/g were synthesized from 1,3-bis(4-aminophenyl)-4,5-diphenylimidazolin-2-one and various aromatic tetracarboxylic dianhydrides by the conventional two-step procedure that included ring-opening polyaddition and subsequent thermal cyclo…
The magnetic susceptibility of the diluted magnetic ${\mathrm{Lu}}_{2\ensuremath{-}x}{\mathrm{Gd}}_{x}{\mathrm{O}}_{3}$ $(x=0.06,$ 0.10, 0.22, 0.40, 1.00, 1.40, 1.80) was measured in the temperature range 1.7--295 K. The inverse susceptibility changes slope to a smaller value below 2.2 K for the samples with $x<~0.…
Abstract Monte Carlo simulations of bulk polyethylene were performed on a high‐coordination lattice. In this study, we investigated the effect of coarse‐grained short and long range interaction parameters on the dynamic properties of the bulk system. As a result of fine tuning of the simulation parameters, our coarse‐…
This paper introduces a method of objectively designing the optimum silhouette of ladies' garments based on fabric mechanical properties, rather than relying on designers' experience. The optimum silhouette is objectively discriminated by a discriminant equation. Approximately 300 fabric samples for ladies' garments a…
Abstract not Available.
The lattice dynamics computer code PARAPOCS was successfully used to calculate the 240 vibrational frequencies of pyrope garnet, Mg 3 Al 2 Si 3 O 12 , at ambient conditions. The atomic displacement vectors (eigenvectors) for each frequency were also calculated and their symmetry relations analyzed with the aid of fact…
Nitrogen (via a polymeric AlN precursor) and ZrO 2 are introduced into a MgO‐CaO‐Al 2 O 3 ‐SiO 2 ‐glass. Subsequent crystallization of the glass results in a fine‐grained oxynitride glass‐ceramic. The microstructure of the latter is found to be entirely different for nitrogen concentrations of 4.85 and 9.94 mol%. Not…
Conducting poly(acrylamide) films were synthesized by exposing the polyacrylamide films impregnated with ammonium peroxodisulphate, an oxidizing agent, to hydrochloric acid vapor and then to aniline vapor. The effects of varying the exposure time to aniline vapor and the resulting composite films of polyacrylamide–pol…
The passivity of 98.0% pure beryllium has been studied in ambient temperature aqueous solutions as a function of pH. Below solution pH 2, potentiodynamic polarization curves exhibited active dissolution at all applied anodic potentials. In solution pH 2 to 12.5 it is shown that beryllium exhibits passive anodic behavi…
This paper presents a further improvement of the mean-field method of obtaining the Leslie viscosity coefficients of biaxial nematic liquid crystals presented in our last paper [M. Fialkowski, Phys. Rev. E 55, 2902 (1997)]. We carry out the calculations without using simplifying procedures employed in the cited paper.…
Calcium and small organic molecules (e.g., tyrosine, MW 181 Da) introduced into the extrapallial fluid (EPF) of the quahog Mercenaria mercenaria exhibit rapid fluxes across the outer mantle epithelium and are distributed throughout the circulatory system within 3 h. Larger molecules (e.g., bovine serum albumin, MW 66,…
We describe an extremely simple method of obtaining optically sectioned images with conventional low-power imaging systems in real time. A single spatial frequency grid pattern is projected onto an object. Images taken at three spatial positions of the grid projection are processed to provide 3D images of macroscopic…
Abstract The crystal structure of macphersonite (Pb 4 SO 4 (CO 3 ) 2 (OH) 2 , Pcab, a = 9.242(2), b = 23.050(5), c = 10.383(2) Å) from Leadhills, Scotland has been determined to an R = 0.053. The structure has many features in common with its polymorph leadhillite including three distinct types of layers. Layer A incl…