Materials Literature
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In this contribution a firm foundation to the observed complex permeability spectrum of ferrites (such as NiZn or MnZn spinels) in the gyromagnetic regime (100 MHz, 10 GHz) is provided. Many attributes of the initial permeability of uniaxial ferrites are not correctly reproduced by a straightforward application of the…
Large coercive fields have been obtained in melt-spun Co-Zr(Hf)-B based alloys. The highest coercivities have been observed in Co76 Zr18 B3 Si3 and Co78 Hf16 B3 Si3 samples with values 6.7 and 6.5 kOe, respectively. The saturation magnetization for both samples is estimated to be around 60 emu/g. Thermomagnetic data s…
The development of crystallographic texture in rapidly quenched Fe14Nd2B has been investigated by hot deformation. The method was to catch the process in a state of partial completion, and then use transmission electron microscopy to examine the structure. The degree of texture formation was determined by x-ray diffra…
Experimental results on the high strain rate response of polycrystalline metals are reviewed, with emphasis on the behavior of pure metals. A strong increase in flow stress with increasing strain rate is reported for strain rates of approximately 105s−1 and higher. This increase is observed in pressure-shear plate imp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular architecture of a novel vertex-sharing biicosahedral cluster [(p-Tol3P)10Au13Ag12Br8](PF6) containing a staggered-staggered-staggered configuration for the 25-atom metal frameworkBoon K. Teo, Hong Zhang, and Xiaobo ShiCite this: Inorg. Chem. 1990, 29, 11, 2083–2091…
Several strains of photoautotrophically grown Spirulina spp. contained poly-beta-hydroxybutyrate (PHB) at concentrations never exceeding a few milligrams per gram of dry weight. Under mixotrophic growth conditions in the presence of acetate, PHB reached values greater than 2.5% of dry weight. With pyruvate, no signifi…
The thermal expansion behavior of 13 members of ABO 4 compounds of the zircon family is examined in terms of crystal chemical (size, charge, and mass of cations) and crystallographic ( a and c ) parameters. The systematic trend in the thermal expansion coefficients, α a and α c , with the ionic radii, r A and r B , ca…
Extant theories for nucleation and growth of crystals in molecular systems are adapted to colloidal dispersions and used to compare observations for charged spheres at low ionic strengths; soft, polymerically stabilized spheres: and hard spheres.
Abstract The transport properties of silicone rubber are reported at 35°C for a series of pure gases (He, N 2 , CH 4 , CO 2 , and C 2 H 4 ) and gas mixtures (CO 2 /CH 4 and N 2 /CO 2 ) for pressures up to 60 atm. The effects of pressure and concentration on the permeability of various gases have been analyzed to consi…
The grain‐boundary chemistry of magnesium aluminate spinel solid solutions MgO· n Al 2 O 3 in which grain growth measurements were reported in part I has been investigated in order to understand the mechanism of grain‐boundary migration. It is found that although segregation of impurity Ca and Si is common, much large…
ABSTRACT Surface response modeling was used to characterize the effect of extrusion processing on the functional properties of corn fiber/corn starch formulations. Process parameters evaluated included screw speed (200‐500 rpm), temperature (90‐150°C) and pH (3‐11). Generally, the water holding capacity of starch incr…
Optical microscopy, X-ray diffraction and NMR spectroscopy have been used to examine whether the hexagonal phases of representative chromonic and amphiphilic mesogens are miscible. The systems studied were octaoxyethylene-glycol dodecylether with either disodium cromoglycate or 5-n-hexyl-7-(5-methyl-sulphonimidoyl) xa…
Third-order optical nonlinearities have been evaluated for organic materials in powder, solution, and film forms, by third-harmonic generation (THG) measurement. Considerations of the effects of THG interference between film sample and substrate, and of the effect of THG in air, are made for an accurate x(3) evaluatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic studies of the photochromic molecule N-(2-hydroxybenzylidene)aniline and its photoproductWayne. Turbeville and Prabir K. DuttaCite this: J. Phys. Chem. 1990, 94, 10, 4060–4066Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Publ…
Global damage indices based on equivalent modal parameters are defined using the vibrational parameters of an equivalent linear structure. In continuum mechanics‐based damage models, effects of the growth and coalescence of microcracks are accounted for through the definition of an internal or local damage variable. D…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, luminescence, and excited-state complexes of the tris(1,10-phenanthroline)- and bis(terpyridine)iridium(III) cationsN. P. Ayala, C. M. Flynn Jr., LouAnn Sacksteder, J. N. Demas, and B. A. DeGraffCite this: J. Am. Chem. Soc. 1990, 112, 10, 3837–3844Publication Date…
The fracture‐toughness‐determining mechanism of silicon carbide with additions of yttria and alumina was studied. Observations of indentation crack profiles revealed that significant crack deflection had occurred. Median deflection angles increased with increased volume fractions of the second phases, which was accomp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiodegradable film derived from chitosan and homogenized celluloseJun Hosokawa, Masashi Nishiyama, Kazutoshi Yoshihara, and Takamasa KuboCite this: Ind. Eng. Chem. Res. 1990, 29, 5, 800–805Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Publ…
Rylenes are annelated arenes derived formally by coupling all the peri-positions of naphthalene. Several soluble oligorylenes have now been synthesized as models for “polyrylene” 1. R = H. Among the most striking features to emerge in the course of characterizing the compounds were a small HOMO/ LUMO energy gap for th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh turnover rates in pH-dependent alkene epoxidation using NaOCl and square-planar nickel(II) catalystsHeungsik Yoon, Thomas R. Wagler, Kenneth J. O'Connor, and Cynthia J. BurrowsCite this: J. Am. Chem. Soc. 1990, 112, 11, 4568–4570Publication Date (Print):May 1, 1990Publi…