Materials Literature
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Magnetic properties observed experimentally in the 3d transition-metal dichalcogenides with the pyrite structure are reviewed and compared with properties expected theoretically for the Hubbard model. As characteristics of electrons in a narrow band, the following are discussed: (1) The temperature induced and field i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Weight and Temperature Dependence of Polymer Dimensions in SolutionA. Ziya Akcasu and Charles C. HanCite this: Macromolecules 1979, 12, 2, 276–280Publication Date (Print):March 1, 1979Publication History Published online1 May 2002Published inissue 1 March 1979https…
NMR results are used to evaluate the spin-orbit contribution to the magnetic anisotropy of Co atoms at individual Co sites in $R{\mathrm{Co}}_{5}$ compounds. The easy $c$-axis Co anisotropy of $R{\mathrm{Co}}_{5}$ compounds is found to arise from the ($2c$) sites, while the ($3g$) sites make a smaller opposing contrib…
Abstract not Available.
The recrystallization kinetics of alloys containing a stable, dispersed second-phase are reviewed, and the effects of interparticle spacing, particle size, particle strength, and strain are considered. An outline is given of the deformation mechanisms in two-phase alloys, the origin of the misoriented zones associated…
Abstract We propose a theory for the appearance of two‐phase structures during the formation of polymer membranes from a casting solution immersed in a coagulant bath. Our model is based on diffusion induced phase separation at the spinodal in the ternary nonsolvent‐solvent‐polymer system. A simplified treatment of th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Studies on Multicomponent Polymer Systems by X-ray Photoelectron Spectroscopy. Polystyrene/Poly(ethylene oxide) Diblock CopolymersH. Ronald Thomas and James J. O'MalleyCite this: Macromolecules 1979, 12, 2, 323–329Publication Date (Print):March 1, 1979Publication His…
The spectral dependence of the absorption coefficient of silicon for photon energies up to 2.7 eV was determined for several temperatures in the range 298–473 K. The effect of a temperature increase appears as a red shift of the absorption spectrum. The magnitude of the shift is larger than that of the fundamental ene…
El autor expone, en esta primera parte, la cuestión desde el punto de vista del fabricante limitándose a las consecuencias apreciables en las cualidades del hormigón. Trata de responder a dos preguntas: ¿Por qué se debe cambiar el contenido de aluminato tricálcico de un cemento? ¿Qué beneficios, o que perjuicios, prod…
Se puede afirmar que la durabilidad del hormigón está principalmente condicionada a su compacidad y a su aislamiento de los ambientes agresivos. Los agentes destructores endógenos se consideran eliminados cuando el hormigón está preparado correctamente, con materiales durables y técnica perfecta de amasado, colocación…
Las numerosas consultas de constructores que, para amasar sus hormigones, no disponían de agua exenta de impurezas, movieron nuestra curiosidad a ensayar, en la División de Durabilidad del Departamento de Química en el lETcc, la influencia que algunas sales disueltas en el agua de amasado ejercen sobre las propiedades…
Con motivo de una probable normalización de cementos portland con adiciones de finos silícicos, puzolanas y cenizas volantes hasta un 35%, el Laboratorio Central de Puentes y Caminos realizó un estudio para poner de manifiesto, en forma cuantitativa, la influencia de las diversas adiciones sobre las características, n…
El Prof. P. K. Mehta ha puesto de manifiesto que las cenizas de las cascaras del arroz tienen las propiedades de una sílice muy reactiva.
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The carbonation‐reaction kinetics of beta‐dicalcium silicate (2CaO·SiO 2 or β‐C 2 S) and tricalcium silicate (3CaO. SiO 2 or C 3 S) powders were determined as a function of material parameters and reaction conditions and an equation was developed which predicted the degree of reaction. The effect of relative humidity,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCis-trans photoisomerization of azobenzene. Solvent and triplet donors effectsPietro. Bortolus and Sandra. MontiCite this: J. Phys. Chem. 1979, 83, 6, 648–652Publication Date (Print):March 1, 1979Publication History Published online1 May 2002Published inissue 1 March 1979htt…
A review of the available electrical and structural data on both pure and doped 1T-TaS2 leads us to propose that the nearly commensurate to commensurate transition at 200 K is accompanied by Mott localization in two dimensions. One electron out of 13 in the Ta plane is localized onto the centre of a star of 13 Ta atom…