Materials Literature
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Pillared clay has emerged in recent years as a very good shape-selective solid acid catalyst for various organic chemical transformations. In the present study an attempt has been made to prepare various pillared inter-layered clays (PILC) with inorganic polyoxocations prepared from Al, Zr and mixed Al and Zr salts. P…
In order to simulate the experimental phenomenon of increase of natural frequency to a cantilevered ferromagnetic beam plate in in-plane magnetic fields, a theoretical model for behaving the magnetoelastic interaction is proposed in this paper based on the variational principle of energy functional of the system. It i…
A knowledge of substituent electronic effects is essential to the understanding of relative rates, equilibrium constants, and reactive intermediates of both in vivo and in vitro reactions. At Lebanon Valley College, we have developed an electrochemical experiment that correlates the electronic effects of substituents…
A spectral approach to the theory of partial coherence of nonstationary light [ M. Bertolotti , Pure Appl. Opt.6, 153 (1997)] is applied to the study of spatial coherence properties of nonstationary wave fields on propagation in free space. Three types of nonstationary light sources are considered—a point source, a sp…
The mechanism of strength reduction of sewing threads has been discussed in Part I of this paper. The effect of fabric tightness and certain thread properties like its size, coefficient of yarn-metal friction, twist direction, number of piles, type of fibre and fibre denier on strength reduction has been studied and f…
This work describes the preparation and characterization of anionic collagen composites with rhamsan and vinylidene fluoride-trifluorethylene with improved rheological and dielectric properties without loss of collagen secondary structure with an interaction occurring between both macromolecules of the composites. On…
Abstract Fifteen Swedish and Finnish soil samples from spodic B horizons containing imogolite-type materials were equilibrated with dilute NaCl and HC1 at 8°C. For the NaCl extracts, apparent equilibrium with respect to an AI(OH)3 phase was reached in one to two weeks. Equilibrium with respect to an imogolite-type pha…
We study the nucleation of cholesteric fingers in directional growth when a cholesteric phase of positive dielectric anisotropy grows into its isotropic liquid. The experiment is performed in homeotropic anchoring and in electric field near the coexistence line of unwinding of the cholesteric helix. Four types of fing…
A general overview on Lamellar Double Hydroxides (LDHs) is given, includind discussions about the structure and preparative methods. A tentative development strategy illustrated by examples is suggested.
The second-order nonlinear optical (NLO) properties of some bisdithiophene d8 metal complexes, for example, the donor–acceptor unsymmetrically substituted bisdithiophene nickel(II) complex shown in the Figure, are reported for the first time. The synthesis and characterization of the complexes are described and the re…
The genus Chaetoceros , one of the most important genera of diatoms in the marine plankton, has been investigated from 20 stations in Danish waters during the period 1991–1995. Thirty‐five taxa were identified, 18 of which were brought into culture for further morphological studies. Three taxa are reported for the fir…
The substitution of methionines with leucines within the interior of a protein is expected to increase stability both because of a more favorable solvent transfer term as well as the reduced entropic cost of holding a leucine side chain in a defined position. Together, these two terms are expected to contribute about…
We report the experimental observation and analysis of optical second-harmonic generation in the 3R and 2H polytypes of molybdenum disulfide (MoS2) by a fundamental excitation wavelength of 1064 nm. We include an extension from the literature to account for multiple reflections of the fundamental, anisotropic optical…
Mechanical properties of silicon nitride which was superplastically deformed in plane‐strain compression were investigated. Superplastically deformed silicon nitride exhibited a highly anisotropic microstructure, where rod‐shaped grains tended to be aligned along the extruding direction. The bending strength and fract…
The antifungal activity of chitosan, a biopolymer of beta-1-4 glucosamine, against Alternaria alternata f. sp. lycopersici , causal agent of black mold of tomato, was investigated. Chitosan was incorporated into potato-dextrose broth at concentrations of 100-6400 mug ml - 1, and the growth and toxin production by the…
Flexoelectric coupling gives rise to a linear electro-optic response in cholesterics (flexoelectrooptic effect) with a uniformly lying helix (ULH) structure and this electro-optic effect is strongly reliant on the homogeneity and quality of the texture. The ULH structure, unfortunately, is complicated in itself and ma…
Polarized Raman and infrared espectra of l-threonine crystals have been obtained at room temperature and an assignment of normal modes is proposed based on group theory analysis. The usefulness of these assignments comes from the fact that some modes are related to important vibrations that can show changes under diff…
Carbon nanotubes exhibit unusual electronic and mechanical properties which vary with subtle changes in microstructure, applied electromagnetic field and mechanical deformations, and introduction of topological defects. These novel properties offer unprecedent opportunities to study fundamental physics, fabricate adva…
The formation of a poorly crystalline layer‐lattice type of magnesium silicate has been demonstrated in mixtures of magnesium hydroxide with hydrated silicic acid that has been intimately combined via grinding and then aged at room temperature for six months. X‐ray diffractometry, Fourier transform infrared spectrosco…
Formation energies of oxygen and uranium vacancies, interstitials and Frenkel pairs as well as Schottky trio defect energies in uranium dioxide are calculated by means of the linear muffin-tin orbital supercell method in the atomic sphere approximation. These ab initio results are in qualitative agreement with experim…