Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered structure of thermotropic liquid-crystal polymer. 1. Characterization of liquid-crystal domain textureToshio Shiwaku, Akemi Nakai, Hirokazu Hasegawa, and Takeji HashimotoCite this: Macromolecules 1990, 23, 6, 1590–1599Publication Date (Print):March 1, 1990Publication…
Abstract The response of a HDPE, a L‐LDPE and a PP homopolymer to processing conditions and processing stabilizer formulations in the 220°C to 280°C temperature range was investigated. The technique of multiple extrusion was used. Melt flow and melt flow ratio were measured after the first, third and fifth extrusion p…
A new version of a corona triode setup, allowing charging dielectric foils with a constant current, was developed. The charging current is kept constant by controlling the grid voltage. We show that the sample surface potential can be inferred from the grid voltage and present results of the uniformity of charge depos…
A new model of interstellar silicon chemistry is presented that explains the lack of SiO detections in cold clouds and contains an exponential temperature dependence for the SiO abundance. A key aspect of the model is the sensitivity of SiO production by neutral silicon reactions to density and temperature, which aris…
A two-dimensional rhombus tiling model with a matching-rule-based energy is analyzed using real-space renormalization-group methods and Monte Carlo simulations. The model spans a range from T=0 quasiperiodic crystal (Penrose tiling) to a random-tiling quasicrystal at high temperatures. A heuristic picture for the diso…
L-Malate dehydrogenase from the extremely thermophilic mathanogen Methanothermus fervidus was isolated and its phenotypic properties were characterized. The primary structure of the protein was deducted from the coding gene. The enzyme is a homomeric dimer with a molecular mass of 70 kDa, possesses low specificity for…
A computer model for the hysteresis phenomenon in ferromagnetic cores is presented. The determination of the B-H trajectories is based on Preisach's theory, and requires, as input data, the extrado function Be(H) which is the upper bound of the limiting hysteresis loop. The hysteresis model has been checked against me…
Abstract A methodology developed for modeling many aspects of high energy displacement cascades with molecular level computer simulations is reviewed. The initial damage state is modeled in the binary collision approximation (using the MARLOWE computer code), and the subsequent disposition of the defects within a casc…
An analysis of cascade and subcascade formation in fcc metals by D-T fusion neutron irradiation is made by fitting the experimentally observed distribution of cascade zone size and number of subcascades to the calculated primary recoil energy spectrum. The analysis is made by categorizing subcascades into closely spac…
Mullite/cordierite composite powders containing different proportions of cordierite were prepared by the sol‐gel method using boehmite, colloidal silica, and Mg(NO 3 ) 2 ·6H 2 O. Mullite and cordierite sols were prepared separately and mixed to form the composite sol. Mullitization temperature depends on the cordierit…
Phase transformations of pure ${\mathrm{ZrO}}_{2}$ at high pressure up to 60 GPa were investigated by using x-ray diffraction and micro-Raman-scattering methods. The existence of phase transformation at about 13 GPa was reconfirmed by the spectral change of in situ Raman scattering. A new phase transformation at 35 GP…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange interaction in multinuclear transition metal complexes. 14. Exchange interactions in a novel copper(II) linear-chain compound with ladderlike structure: Cu2(1,4-diazacycloheptane)2Cl4B. Chiari, Olivo Piovesana, T. Tarantelli, and P. F. ZanazziCite this: Inorg. Chem.…
We investigated the wetting behavior and reactions of different metals on Si 3 N 4 using sessile drop measurements, analysis of reaction layers, and measurements of strengths of joined bars. Active metals, such as Al and Ti, and alloys that contain them react with Si 3 N 4 and cause wetting and spreading at the interf…
The theory developed aims to explain erratic motions that have been observed experimentally to be performed by small bubbles in liquids irradiated by sound. An exact relation between dynamic and kinematic integral properties of any bubble is used as the basis for calculating the propulsive effects of deformations from…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCationic porphyrins in water: proton NMR and fluorescence studies on dimer and molecular complex formationKoji. Kano, Masao. Takei, and Shizunobu. HashimotoCite this: J. Phys. Chem. 1990, 94, 5, 2181–2187Publication Date (Print):March 1, 1990Publication History Published onl…
Si 3 N 4 matrix composites reinforced by SiC whiskers, SiC particles, or both were fabricated using the hot‐pressing technique. The mechanical properties of the composites containing various amounts of these SiC reinforcing materials and different sizes of SiC particles were investigated. Fracture toughness of the com…
The long term aging behaviour of a large number of Mo bearing and Mo free heats of cast duplex stainless steels has been studied between 300 and 450°C in terms of hardness and impact Charpy toughness. The results demonstrate the importance of the ferrite, Cr, and Mo contents in controlling aging response. Owing to the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and coordination chemistry of the hexadentate ligands 1,4,7-tris(2-hydroxybenzyl)-1,4,7-triazacyclononane (H3L1) and 1,4,7-tris(3-tert-butyl-2-hydroxybenzyl)-1,4,7-triazacyclononane (H3L2). Crystal structures of [HL1CuII] and [L2FeIII]acacHUlf Auerbach, Uwe Eckert,…
A new method for producing controlled‐geometry, controlled‐crystallography, cracklike defects using photolithography has been developed. The method has been applied to sapphire, and used to study crack healing behavior at 1800°C. Effects of crack face and crack perimeter crystallography, crack face microstructure, and…
An approach to the analysis of grating-coupled semiconductor lasers is presented. It is shown that there are only two resonant solutions when the grating has infinite extent. The solutions are either symmetric or antisymmetric about the center of the longitudinal coordinate system where the antisymmetric solution is n…