Materials Literature
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We have studied the electronic structure of a metallic antiferromagnet ${\mathrm{V}}_{5}$${\mathrm{S}}_{8}$ above the N\'eel temperature by photoemission spectroscopy. The V 3s core-level peak shows a splitting dominated by the exchange splitting resulting from the high-spin ${\mathit{d}}^{2}$(${\mathrm{V}}^{3+}$) con…
The effectiveness of a grain bridging mechanism in the following wake zone of two MgAl 2 O 4 spinel microstructures has been demonstrated through renotching experiments with double‐cantilevered‐beam (DCB) specimens. Measurements of d K R /dδ a agree with previous crack growth resistance curves of similar materials, ob…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced dilatational motion in monolayers of poly(methyl methacrylate) having benzospiropyran side groupsI. Panaiotov, S. Taneva, A. Bois, and F. RondelezCite this: Macromolecules 1991, 24, 15, 4250–4254Publication Date (Print):July 1, 1991Publication History Published…
The genus Viridiella gen. nov. with a single species Viridiella fridericiana sp. nov. (Chlorococcales, Chlorophyta) is proposed. Cells are ellipsoidal to globose, and have a smooth cell wall and a single parietal chloroplast without pyrenoids. Reproduction occurs by the formation of 4–8 autospores. Viridiella can be d…
Abstract Quantity‐intensity (Q/I) curves and derived parameters provide general information about soil K availability. This investigation was conducted to study the relationship between the K Q/I parameters and the properties of 24 calcareous Inceptisols and Vertisols of southwestern Spain. Three Q/I parameters were c…
The mechanism of heat transfer through closed cell foam isulation can include conduction through gas in the cell interiors, conduction through the solid polymers, and thermal radiation. Each of these mechanisms is described. The rate of aging of foam insulation is related to the diffusion of air and blowing agents int…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDifferential dynamic modulus of polyisobutylene with high molecular weight. 1. Single-step large shearing deformationsYoshinobu Isono, Kenji Itoh, Toshio Komiyatani, and Teruo FujimotoCite this: Macromolecules 1991, 24, 15, 4429–4432Publication Date (Print):July 1, 1991Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControl of molecular tilt angles in oriented monolayers deposited by a chemical adsorption technique and application of the monolayers as an alignment filmNorihisa Mino, K. Nakajima, and K. OgawaCite this: Langmuir 1991, 7, 7, 1468–1472Publication Date (Print):July 1, 1991Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetalloporphyrin photochemistry with matrix isolationKenneth S. Suslick, Jocelyn F. Bautista, and Randall A. WatsonCite this: J. Am. Chem. Soc. 1991, 113, 16, 6111–6114Publication Date (Print):July 1, 1991Publication History Published online1 May 2002Published inissue 1 July…
Abstract A chiral aluminium complex of a Schiff&s base is a new initiator for the preparation of defined (number‐average degree of polymerization, functionality) oligomers derived from heterocyclic monomers (oxiranes, β‐lactones).
Abstract A variety of living polymerization systems are now available for the controlled synthesis of block copolymers. Although living anionic polymerization remains as the method of choice for the most precise structural control, living polymerizations proceeding via other mechanistic types provide extremely useful…
Abstract The synthesis of highly uniform (1,08 ≤ M w / M n ≤ 1,13) telechelic poly(ε‐caprolactone) terminated at both ends with OH groups and its derivatization leading to poly(ε‐caprolactone) with pyrene end‐groups are described. The synthesis, carried out in THF at room temperature, involves initiation with (CH 3 CH…
The radiative and Auger emissions in cascade (RAC) model constructed earlier [G. Omar and Y. Hahn, Phys. Rev. A (to be published)] is applied to the calculation of the final-charge-state distribution in the decay of ${\mathrm{Ar}}^{+}$(1s\ifmmode\bar\else\textasciimacron\fi{}) with an initial 1s hole created by synchr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain conformation and dynamics of crystalline 1,4-trans-polyisoprene and its inclusion compound with perhydrotriphenyleneFrederic C. Schilling, Piero Sozzani, and Frank A. BoveyCite this: Macromolecules 1991, 24, 15, 4369–4375Publication Date (Print):July 1, 1991Publication…
Polycrystalline samples of Ba2Me2Fe28O46 (Me2-X, Me=Ni, Cu, Mg, and Zn) hexagonal ferrite have been prepared by the classical ceramic method. Low-temperature magnetic properties and Curie temperature were investigated. The substitution of Fe2+ ion with Ni2+, Cu2+, and Mg2+ ions decreases spontaneous moment of Me2-X du…
Chemical transformations that occur under flooded conditions in two limestone soils from flood-prone agricultural areas of south Florida were investigated. Redox potential and pH of Krome very gravelly loam and Chekika very gravelly loam soils were monitored over a 5-week submergence period. Within 2 days of flooding,…
Abstract The effect of ultrasonic waves upon foam extrusion has been investigated by using a special die attached to an extruder. The die consists of a special ultrasonic horn, having a circular channel, that vibrates at 20 KHz. Various ultrasonic amplitudes and flow rates were employed during extrusion of a foamed po…
We present new Monte Carlo calculations of the third and fourth virial coefficients for isotropic systems of different two-dimensional hard convex bodies: ellipses, rectangles and spherocylinders for various aspect ratios, and needles. Our results differ significantly from previously published values. The accuracy of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular charge transfer properties of dicyanovinyl-substituted aromaticsAlan R. Katritzky, Dong Wei Zhu, and Kirk S. SchanzeCite this: J. Phys. Chem. 1991, 95, 15, 5737–5742Publication Date (Print):July 1, 1991Publication History Published online1 May 2002Published in…
Experiments show that the characteristic periodic damage pattern that results from the optical fuse can be produced by purely thermal means by heating the fiber to temperatures in the 700-1000 degrees C range in the absence of light. The nature of the damage region bubbles suggests local temperatures high enough to so…