Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of annelation on the electronic properties of phthalocyanine macrocyclesE. Orti, M. C. Piqueras, R. Crespo, and J. L. BredasCite this: Chem. Mater. 1990, 2, 2, 110–116Publication Date (Print):March 1, 1990Publication History Published online1 May 2002Published inis…
The influence of stoichiometry, i.e., Ba/Ti ratio, on the microstructure and positive temperature coefficient of resistivity (PTCR) characteristics of BaTiO 3 was investigated. Fine‐grain microstructures are obtained for Ba‐rich, stoichiometric, low‐temperature‐sintered, Ti‐rich materials. The room‐temperature resisti…
A binary liquid undergoes unidirectional solidification. The one-dimensional steady state is susceptible to morphological instability that causes the solid/liquid interface to change from a planar state to a cellular pattern. This paper examines the effects on this transition of volume-change convection, buoyancy-driv…
The complete primary structure has been determined for an inhibitor protein of protein kinase C. The bovine brain-derived inhibitor has a pI of 6 and its N-terminal alanine residue is blocked by acetylation. Fragments obtained by chemical and enzymatic cleavage of the purified inhibitor were analyzed by Edman degradat…
Abstract In attempts to improve the compatibility of polypropylene with polyethylene terephthalate, an acrylic acid functionalized polypropylene was evaluated as the blend component in polyblends containing 40 percent by weight polyethylene terephthalate and compared with an unmodified polypropylene. The preliminary e…
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…