Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcimer formation in sterically hindered poly(9-vinylcarbazole) and its dimer model compoundsShinzaburo Ito, Kazukiyo Takami, Yoshinobu Tsujii, and Masahide YamamotoCite this: Macromolecules 1990, 23, 10, 2666–2673Publication Date (Print):May 1, 1990Publication History Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of carbon atom bridged heterocyclic polymers of specified conjugation length. 1. Novel polyterthiophenesSamson A. JenekheCite this: Macromolecules 1990, 23, 11, 2848–2854Publication Date (Print):May 1, 1990Publication History Published online1…
Abstract Potassium‐Ca and NH 4 ‐Ca exchange reactions in soils are often investigated in laboratory‐type studies. In these studies, it is assumed that the results from the binary exchange systems can be extrapolated to ternary (three ion) exchange systems using appropriate models. This, however, is rarely evaluated. T…
Lead scandium tantalate (PST) is a ferroelectric relaxor with the perovskite structure of A(B′B″)O 3 . By suitable heat treatment, the B‐site cations can be brought from a stucturally disordered state into various degree of ordering. The degree of ordering is strongly affected by the amouth of vacancies present in the…
The effects of vanadium substitution on the magnetic properties of Sm-Fe-Ti-V melt-spun ribbons and the magnetic properties and microstructure of sintered Sm-Fe-Ti based magnets are reported. The highest coercivity, Hc =10.65 kOe, was obtained in a heat-treated melt-spun Sm8 Fe75.5 Ga0.5 Ti8 V8 alloy. This is the high…
Deux methodes couramment utilisees pour tester la periodicite, a savoir la minimisation de la dispersion de phase et la repartition par epoque (epoch-folding), sont discutees. En utilisant une analyse de variance, on demontre la relation entre ces 2 methodes. Une nouvelle statistique de tests est proposee, applicable…
In Fe-Nd-Ti and Fe-Sm-Ti the phase with the hexagonal structure of Co5R is stabilized by the addition of Ti and has a rare-earth content just above 12 at. %, but well below 16.7 at. %, so that it must be classified as a Cu7Tb type. It and Fe17R2 dissolve approximately 3 at. % Ti, accompanied by an increase in Curie te…
The visible spectra of a series of merocyanines, derivatives of 4-[(4-oxocyclohexa-2,5-dienylidene)ethylidene]-1,4-dihydropyridine, have been investigated in a number of solvents and solvent mixtures. The effect of substituents on the solvatochromic behaviour of these compounds is described. All investigated merocyani…
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…