Materials Literature
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Two whisker‐toughened materials have been studied, with the objective of identifying the mechanisms that provide the major contribution to toughness. It is concluded that, for composites with randomly oriented whiskers, bending failure of the whiskers obviates pullout, whereupon the major toughening mechanisms are the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpecific cleavage of a protein by an attached iron chelateTariq M. Rana and Claude F. MearesCite this: J. Am. Chem. Soc. 1990, 112, 6, 2457–2458Publication Date (Print):March 1, 1990Publication History Published online1 May 2002Published inissue 1 March 1990https://pubs.acs.…
Electrochemical characteristics, conductivities, and morphology of the polypyrrole (PPy) films prepared in aqueous and nonaqueous (acetonitrile) solutions by electrochemical techniques have been studied and the results are reported. Electrochemical parameters studied included exchange rate constants and capacitances f…
Accurate measurement of the beam diameter for a finely focused ion beam is difficult using conventional methods which have been applied in electron beam systems. Generally, the beam is scanned across an abrupt edge while measuring beam current or secondary electron intensity. For ions, the sputtering of the sample deg…
To clarify various kinds of precipitates formation behavior in high level liquid waste (HLLW) from the nuclear fuel reprocessing process, undissolved materials generated in concentration step under vacuum evaporation and aging step at various temperatures and nitric acid concentrations using simulated HLLW solution we…
A closed-form solution for the electromagnetic field distribution inside a hysteresis motor is presented. The solution is based upon Maxwell's field equations, considering the case of a circumferential-flux-type machine at synchronous speed. A hysteresis loop in the shape of an inclined ellipse is adopted. The applica…
The authors propose a 2-D magnetic field calculation method that takes into account the nonlinear anisotropic property in the grain-oriented steel. An elliptical model is used; the magnetic permeability is represented by a tensor with field-dependent components. This model is applied to a finite-element method using a…
Abstract A brief introduction describes the main differences between homo, and copolymer polyacetals and their main degradation mechanisms. A short overview describes the importance of stabilization and the necessity of using antioxidants and costabilizers during manufacturing, processing and end use of polyoxymethyle…
Abstract The unstable glassy component of the Oligocene tuffaceous sediments of the Metaxades area, Thrace, Greece, has undergone extensive zeolitic diagenetic alteration. The authigenic minerals occur as crypto- to micro-crystalline aggregates making up most of the matrix in the altered tuffs and as precipitates in c…
When a G. hirsutum cotton fiber was suspended under tension in water and then allowed to dry without removing the stress, its strength increased and its extensibility decreased. If the sample was slack mercerized before the treatment, its strength and extensibility changes were not as marked. The altered properties of…
Abstract Dynamic‐mechanical and dielectric characterization of the cold crystallization of PEEK has been performed in order to develop a non‐destructive evaluation method of crystallinity in thermoplastic matrices. The Avrami approach is applied here to describe the Poly(ether ether ketone) (PEEK) crystallization kine…
The title compound 2 contains an FeCReRe unit . This 1,3‐dimetallaallene is a novel example of the rare carbide‐bridged complexes. 2 is formed on reaction of the dichlorocarbene complex 1 with pentacarbonylrhenate (TPP tetra‐phenylporphyrinate). equation image
SUMMARY The sorption of phosphate (P) by four strongly acid Fijian soils from 0.01 M CaCl 2 decreased with increasing pH up to pH 5.5–6.0 and then increased again. The initial decrease in P sorption with increasing pH appears to result from an interaction between added P, negative charge, and the electrostatic potenti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbon dioxide conditioning effects on sorption and volume dilation behavior for bisphenol A-polycarbonateG. K. Fleming and W. J. KorosCite this: Macromolecules 1990, 23, 5, 1353–1360Publication Date (Print):March 1, 1990Publication History Published online1 May 2002Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIn situ ESR and Raman spectroscopic studies of the electrochemical process of conducting polypyrrole filmsC. J. Zhong, Z. Q. Tian, and Z. W. TianCite this: J. Phys. Chem. 1990, 94, 5, 2171–2175Publication Date (Print):March 1, 1990Publication History Published online1 May 20…
Abstract Changes which occur during the natural weathering of biotite in granite gneiss and associated soils are measured by microanalysis and illustrated by SEM. Biotite weathers through a series of interstratified minerals to vermiculite and/or smectite phases which decompose rapidly to kaolinite. Both vermiculite a…
Soft-tissue damage adjacent to dental restorations is a deleterious side effect of radiation therapy which is associated with low-energy electron scatter from dental materials of high electron density. This study was designed to investigate the enhancement of dose to soft tissue (or water) close to high electron-densi…
Abstract 1. Up to now, the application of the Einstein-Guth-Gold equation seemed to be limited to inactive fillers. 2. However, in the form of Equation (6), it describes with high accuracy the moduli of vulcanizates containing active fillers as a function of the filler volume fraction at least up to ϕ=0.22 at uniaxial…
Abstract A model and a simple measurement technique for time of encapsulation have been developed to study the microencapsulation of butachlor in polyurea shell by means of interfacial polymerization. The model is based on diffusion of the hydrophilic monomer through the polymeric shell with an interfacial reaction at…
The southwestern Indian paintbrush, Castilleja linariaefolia, yielded extracts that displayed in vivo activity against murine P-388 (PS) lymphocytic leukemia. Separation guided by PS cell line inhibition led to isolation of cytotoxic compounds that were identified as the known glycosides acteoside [1] (ED50 2.6 microg…