Materials Literature
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The isothermal oxidation of ZrC single crystals with (100) orientation was carried out at temperatures of 500°, 550°, and 600°C at an oxygen pressure of 2.6 kPa for times up to 240 h. A polished cross section of the oxidized crystal was observed by backscattered electron imaging in a scanning electron microscope. Quan…
Simple cyclohexane-1,3,5-triamide derivatives are shown to form linear, rod-shaped structures in the solid state; a triple hydrogen-bonding interaction directs formation of the aggregate and leads to non-centrosysmmetric packing arrangement with modest non-linear optical properties.
ABSTRACT Solutions and mechanical treatments for decolorizing and washing of collagen from plaice ( Pleuronectes plutessa ) skin were studied. The best means was high‐speed homogenization with 0.4M NaCl. Four ways of stabilizing this collagen were tried, involving freezing and freeze‐drying, and partial solubilization…
The relative species composition of diatom flocs formed in the presence of 2 diatom species was studied in a series of laboratory experiments. The aim of this study was to investigate whether species composition in floes reflected initial species composition or whether certain species were enriched in aggregates. In e…
The linear (α) and nonlinear (β, γ) molecular polarizabilities of a series of donor-acceptor \npolyenes containing 3-8 π-bonds are studied using the semiempirical AMl parametrization \nand finite-field (hyper)polarizability computations as a function molecular polarization and \nresulting changes in bond-l…
A review is given of the development of the water-soluble contrast media (CM) with particular attention to the frquency of neurological complications. A remarkable improvement was achieved following the introduction of the nonionic agent metrizamide in 1974, and a further decrease in neurotoxicity was obtained with th…
The Surface Evolver has been used to minimise the surface area of various ordered structures for monodisperse foam. Additional features have enabled its appl ication to foams of arbitrary liquid fraction. Early results for the case of dry foam (negligible liquid fraction) produced a structure having lower surface area…
Abstract Acetylation of native hydrolyzed and oxidized, maize starch has been studied. The different factors affecting acetylation process were investigated. These factors include liquor ratio, acetic anhydride, perchloric acid concentration, reaction time and temperature. Also investigated were characterization and a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of Lithium Bromide on the Glass Transition Temperatures of Linear and Macrocyclic Poly(2-vinylpyridine) and PolystyreneYaodong Gan, Dahai Dong, and Thieo E. Hogen-EschCite this: Macromolecules 1995, 28, 1, 383–385Publication Date (Print):January 1, 1995Publication Hi…
Abstract Studies of the microstructure and permeability of extruded ribbons of polypropylene (PP)/ethylene vinyl alcohol copolymer (EVOH) and polyethylene (PE)/polyamide‐6 (PA‐6) blends have shown that it is possible to control the flow‐induced morphology to generate discontinuous overlapping platelets of EVOH or PA‐6…
Thermodynamic analyses for the corrosion of SiC, TiC, TaC, NbC, WC and B4C in the temperature range 300–1000 °C in high-pressure steam have been conducted using a Gibbs energy minimization computer code. The calculated results are compared to experimental results for corrosion of these carbides in a hydrothermal fluid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe P,T-State Diagram and Solid Phase Synthesis of Aluminum HydrideSergei K. Konovalov and Boris M. BulychevCite this: Inorg. Chem. 1995, 34, 1, 172–175Publication Date (Print):January 1, 1995Publication History Published online1 May 2002Published inissue 1 January 1995https…
Considerable theoretical and experimental research on polluted insulators has yet to yield a perfect generalized mathematical model which can predict accurately critical flashover voltages and currents. In this paper an ac model has been proposed especially applicable to static arcs. The salient feature of the propose…
Iodination of 5,15-diphenylporphyrin followed by metallation and palladium(0) catalysed coupling with monosubstituted acetylenes gives zinc(II)-10-(2-substituted-alkynyl)-5,15-diphenylporphyrins.
A new approach to the controlled synthesis of hyperbranched polyesters, via copolymerisation of AB2 and B3 monomers, has been demonstrated. This technique allowed relatively easy production of new families of hyperbranched materials, circumventing the laborious and time-consuming syntheses required for their dendrimer…
In the paper change in iron losses due to the switching frequency in soft magnetic materials supplied by PWM inverter, is analyzed. Experimental tests with several samples of material and switching frequency from 1 kHz up to about 20 kHz, are reported. Values of iron losses vs switching frequency, for different values…
Hydrogen and deuterium trapping sites in high-strength steels have been observed by secondary ion mass spectrometry (SIMS). High-strength steels with 1400 MPa tensile strength are stressed and dipped in D2O and 20% NH4SCN solution at 323 K to occlude hydrogen and deuterium. Depth profiles by SIMS show the presence of…
To improve hydrodynamic journal bearing steady-stale and dynamic performance, a new bearing concept, the wave journal bearing, was developed at the author's lab. This concept features a waved inner bearing diameter. Compared to other alternative bearing geometries used to improve bearing performance such as spiral or…
The compressional and recovering curves of a fabric are considered to consist of three steps, respectively. The first and third steps of the compressional curve and the first step of the recovering curve are approximated by the linear equation (y = a + bx). The second steps of the compressional and recovering curves a…
In this paper we use arguments based on Picard-Fuchs equations and transversality of intersections of level curves to obtain an exact count of the number of stationary solutions of the one-dimensional Cahn-Hilliard equation with a cubic nonlinearity.