Materials Literature
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In classical packing theory, composite packing density of a bimodal mixture is increased by increasing the component fine or coarse packing density via particle size distribution broadening. In this study, the effects of particle size distribution shape of component fine and coarse particle distributions on composite…
Since equipment, built to eliminate the NOx gas in the off gas of iron are sinter plant, is huge inci expensive, it is desirable that a more simple and economical method to eliminate the NO gas is established.The method to eliminate the NO gas near the coke in the iron are sinter bed has been studied. As a basic study…
Hexagonal BaTiO3 was formed by doping only 2mol% of Mn. Investigation of this effect of Mn in terms of its valency state and size of Mn ion revealed that the small size of Mn4+ ion is a dominant factor favoring the formation of the hexagonal phase.
Abstract
Porous particulate polyimides have been prepared by four suspension polycondensation procedures. The first group were linear polyimides prepared in suspension in liquid paraffin from a poly(amido acid) pre-polymer solution. Groups two to four were crosslinked using a tetraamine component. The first of these employed a…
The effect of thermal treatment on the microporous accessibility of an aluminium pillared clay has been investigated. When the calcination temperature was increased up to 673 K, the specific total (or micropore) surface areas increased, but a further increase in the calcination temperature produced a decrease in the s…
Some currently-available formulations of LaRC™-TPI, a thermoplastic polyimide originally developed at NASA-Langley, were found to be highly susceptible to environmental stress cracking when exposed to solvents such as acetone, toluene, diglyme and methyl ethyl ketone. The combination of stress and solvent led to rapid…
The title compound 3 is readily available from 1, 3, 5-triacetylbenzene in a three-step procedure and is an efficient trifunctional core reagent for the synthesis of dendrimers.
The inhibitory effects of chitosan on germination and production of zoospore, and growth of vegetative hyphae of Saprolegnia parasitica Coker were examined. Zoospore germination was completely inhibited by chitosan at the concentration of 0.06%. Mycelial growth was not observed on GY media containing 0.05% chitosan. Z…
New organo-mineral nanocomposites are prepared by reacting ethylene glycol and other diols with the interlemellar silanol groups of the layered silicic acid, H-magadiite, to afford organically pillared layered silicates.
Cathodic polarization of aluminum in acid solution produces a surface film which was studied using infrared reflectance spectroscopy (IRS), and quartz crystal microbalance (QCM), and capacitance measurements. According to the QCM results, deposition of the film began after passage of 7.2 mC/cm 2 of cathodic charge at…
Basics: Ultrasound. Electromagnetics. X-Rays. Others. Methods: Materials Sorting. Microstructure. Macrostructure. Residual Stresses. Materials Properties. Applications: On LIne. Off Line. References. Index.
Fluorescence analysis (FA) is demonstrated to be a very sensitive analytical tool to monitor the quality of thermally processed polymer encapsulants such as EVA. Generation of UV‐excitable chromophores during curing is shown to arise from the presence of the oxidative curing agent, Lupersol peroxide, in the EVA formul…
The binary antimonide compounds of the skutterudite family have a good potential for thermoelectric applications as recent results at the Jet Propulsion Laboratory (JPL) have shown. However, the room temperature thermal conductivity of these materials is about 10 Wm−1K−1 with an estimated 80% contribution from the lat…
In order to estimate surface tension for multicomponent silicate melts, expanded approximation rules was proposed in view of practical use, on the basis of the regular solution approximation rules of excess molar quantities for binary system melts. Necessary parameters for the above rules have been derived using the p…
Studies were conducted to determine the mechanism of blood pressure- and cholesterol-lowering effects of funoran on rats fed with a saline solution and cholesterol diet. Clofibrate (COIB) was used as a reference hypolipidemic drug. Funoran caused significant reduction of systolic blood pressure (SBP). Funoran and CPIB…
In our earlier work, we developed a model for fibrous assemblies by treating each yarn as a true three-dimensional structure. We then were able to predict various orientation limits by manipulating the model until geometric self-intersection would occur. However, that model treated the yarns as inextensible and incomp…
Two shallow O- trapped hole centers in BaTiO3 are identified to arise from association with Na+ and Ptx+. In material with decreased acceptor concentration, ESR of Ti3+ small polarons and Ti3+-Nb5+ pairs is found. The role of such centers in light induced charge transfer and photochromism is studied.
Oxygen-deficient ZnII-bearing ferrites (ZnxFe3 –xO4 –δ, 0 ⩽x⩽ 1, δ > 0) have been synthesized and studied for their reactivity in the decomposition of CO2 to carbon at 300 °C. They were prepared by reducing ZnII-bearing ferrites with H2 gas at 300 °C. The oxygen-deficient ZnII-bearing ferrites consisted of a single ph…
For the first time a synthesis of unsubstituted furoxan, the first member of the furoxan series, has been accomplished.