Materials Literature
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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…
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…