Materials Literature
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Abstract An experimental study of agglomeration tendency and the compounding of calcium carbonates of varying particle size into polypropylene and polystyrene melts in an internal mixer and in a two roll mill is described. The tendency of particles to agglomerate was studied using the sedimentation volume method. Aggl…
It is imperative that operating personnel and regulatory agencies have secure, advance, and accurate knowledge of the true surface properties of materials to be contacted with flowing blood. The actual devices must be characterized in their sterile, immediate pre-exposure states. Although very sensitive electronic ins…
We study experimentally the patterns behind a moving cholesteric--smectic-A interface. There are three interface types, each of which corresponds to one of the three basic topologically possible configurations.
The amplification of light signals by the mechanism of stimulated Raman scattering is discussed, with specific reference to certain heavy-metal germanate and arsenate glasses with Raman-gain-coefficients G of up to 20 times that of fused silica. Calculations are presented of the intrinsic scattering losses from Raylei…
Proteins may be rigid or flexible to various degrees as required for optimum function. Flexibility at the level of amino acid side-chains occurs universally and is important for binding and catalysis. Flexibility of large parts of a protein which rearrange or move are particularly interesting and will be discussed her…
Abstract The effect of varying interaction parameters on the phase diagrams of ternary polymer blends was explored by simulating spinodals through use of the Flory‐Huggins lattice theory. Results indicate that miscibility is favored for the case of ternary mixtures of marginally miscible or marginally immiscible pairs…
Abstract The crystal structures of oxidized and photoreduced decatungstates are compared. Three specimens of decatungstate complexes were prepared in mixed solvents of H2O–CH3CN and were characterized by X-ray diffraction. Unit cell parameters are as follows: (C6H16N)4[W10O32]·2CH3CN; DECA Mr=2841.4, monoclinic, P21⁄n…
Abstract The Powder Diffraction File (PDF) is a collection of single phase X-ray powder patterns, maintained and distributed by the JCPDS-International Centre for Diffraction Data. Over the past 10 years there has been increasing use of the PDF in computer readable form, but the limited amount of disk space available…
A model for protein adsorption kinetics has been presented. This model includes diffusion-limited adsorption, adsorption and desorption rate constants kon and koff, which are dependent on the surface concentration, and an interaction term for the mutual influence of the adsorbed protein molecules. It has been shown th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, electrochemistry, and ligand-addition reactions of gallium(III) porphyrinsK. M. Kadish, J. L. Cornillon, A. Coutsolelos, and R. GuilardCite this: Inorg. Chem. 1987, 26, 25, 4167–4173Publication Date (Print):December 1, 1987Publication History Published online1 May…
Abstract Die pseudobinären Systeme ACl/PrCl 3 (A = NaCs) wurden mittels DTA neu untersucht. Folgende Verbindungen wurden gefunden (erstmalig nachgewiesene Verbindungen sind unterstrichen) K 3 PrCl 6 ; K 2 PrCl 5 ; Rb 2 PrCl 5 , Cs 3 PrCl 6 , , CsPr 2 Cl 7 . Messungen der Lösungsenthalpien, der freien Enthalpien für d…
The twist elastic constant K 22 in 5CB was determined as a function of temperature by the following four independent methods; (1) electric field static light scattering, (2) electric field dynamic light scattering, (3) angular dependence of the scattered light intensity combined with a K 11 or K 33 measurement, and (4…
The morphology, culture, and nutrition of four new species of apochlorotic diatoms (Nitzschia lucisensibilis, N. fluorescens, N. albicostalis and Hantzschia achroma) are described. A key to the seven apochlorotic diatoms, including the three known species (N. putrida, N. leucosigma and N. alba), is included.
This paper deals with one aspect of routing power and ground nets in integrated circuits composed of modules, where the nets are routed in the channels between the modules. Constraints are assumed on allowable voltage drops for maintaining proper logic levels and switching speed. A procedure for determining the width…
A model for the time behaviour of the internal bias field determined by dipole orientation of the transition metaloxygen vacancy type is presented. The measurements of a coarse grained BaTiO3 ceramic doped with 0.5 mol% Cr (grain size about 50μm, density 96%) show that the computer calculations describe satisfactorily…
Abstract The mechanical properties, i.e., Young's modulus, elongation, and tensile stress, were determined as functions of the molecular weight for films of poly(oxydi‐ p ‐phenylene pyromellitimide) prepared by thermal cyclization of the precursor poly(amic acid). The molecular weights of the samples were controlled b…
Graphite intercalation compounds are synthetic metals formed by inserting layers of atoms or molecules of a guest chemical species between the layers of carbon atoms that make up graphite. Because carbon occupies a middle position in the order of electronegativity of the elements in the periodic table, graphite welcom…
A series of lead alloy specimens comprising binary Pb‐Li, Pb‐Sn, Pb‐Sb, and quinary Pb‐(Al, Mg, Sn, Li) alloys were electrochemically tested. The corrosion cell was set up in 30% , using a mercury‐mercurous sulfate reference electrode. The passivity subsequently attained by the respective alloys depended primarily upo…
A bias field dependence of dielectric permittivity ∊'(E) of ferroelectric liquid crystals DOBAMBC and a mixture of DOBAMBC with Sm C substance in a planar Sm C* sample shows four different frequency regions. In two of them the unusual behaviour—increase of ∊' with increasing E—is observed. The first increase found in…
The dielectric and electrostrictive properties of relaxor ferroelectric Pb (Mg1/3Wb2/3)O3-based ceramics are strongly affected by the microstructure with emphasis on the grain size. Both the dielectric constant K and electrostrictive field coefficient (M) were found to increase with increasing grain size whereas the e…