Materials Literature
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The hexagonal cell dimensions a and c of 2H-MoS2 and 2H-WSe2 have been measured over the temperature range 10 to 320 K. In both compounds a increased linearly and c non-linearly with temperature, the linear coefficient of thermal expansion in the c direction being greater than that in the a direction for 2H-MoS2. In 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic properties of tetrakis(cyclohexylamine)di-.mu.-hydroxo-dicopper(II) perchlorate. The first example of a roof-shaped hydroxo-bridged copper(II) dimerM. F. Charlot, S. Jeannin, Y. Jeannin, O. Kahn, J. Lucrece-Abaul, and J. Martin-FrereCite this:…
Summary In order to prepare allophane and imogolite in the laboratory, solutions containing l–2× 10 –3 M orthosilicic acid and 4–0.5 × 10 –3 M A1C1 3 (SiO 2 /Al 2 O 3 molar ratio; 0.5, 1.0, 2.0, 4.0 and 8.0) were heated at 95–100°C for 113 hours after addition of NaOH (NaOH/Al molar ratio; 1.0, 2.0, 2.8 and 3.0). Boeh…
This paper describes the effects of frequency, voltage, temperature and mechanical stress on the times to breakdown of XLPE cable insulation subjected to highly divergent fields. Temperature and mechanical stress reduce the times to breakdown but tests with increasing voltage and high frequency produced unexpected res…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of hydrogen absorption by lanthanum-nickel (LaNi5)W. E. Wallace, R. F. Karlicek, and H. ImamuraCite this: J. Phys. Chem. 1979, 83, 13, 1708–1712Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inissue 1 June 1979https://d…
The progressive development of the α ‐ Al 2 O 3 scale morphology on an Fe‐27% Cr‐4%Al alloy, and similar alloys containing 0.008%, 0.023%, and 0.82%Y, after oxidation in 1 atm oxygen at 1200°C has been investigated. After oxidation for several hours, the oxide present on the yttrium‐free alloy is convoluted and consis…
Incremental plasticity and fracturing (microcracking) material theory are combined to obtain a nonlinear triaxial constitutive relation that is incrementally linear. The theory combines the plastic stress decrements with the fracturing stress decrements, which reflect microcracking, and accounts for internal friction,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiosynthesis and release of organoarsenic compounds by marine algaeMeinrat O. Andreae and David KlumppCite this: Environ. Sci. Technol. 1979, 13, 6, 738–741Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inissue 1 June 1979https:/…
Abstract Some theoretical properties of a semidilute polymer solution (in a good solvent) near a repulsive wall (no adsorption) are discussed. (i) Near a single wall, the existence of a depletion layer (where the concentration is strongly reduced) with thickness equal to the correlation length ξ( c ) is predicted. Sca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantitative analysis of XPS intensities for supported catalystsF. P. J. M. Kerkhof and J. A. MoulijnCite this: J. Phys. Chem. 1979, 83, 12, 1612–1619Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inissue 1 June 1979https://pubs.…
Describe el autor los problemas que se presentan en la conservación de las estructuras da hormigón y metálicas de la fábrica de abonos de Neyveli, y las medidas de protección que le han dado mejor resultado.
La influencia menos discutida del C3A sobre las cualidades del cemento es su efecto sobre el calor de hidratación. Los primeros que relacionan la composición del cemento con el calor de hidratación son Wood Seteineur y Starka en 1932 (17). Sus resultados son probablemente anticuados. Verbeck y Forter (18) y más tarde…
En publicaciones anteriores (1) (2) se dio cuenta de los trabajos efectuados para estudiar el comportamiento de dos cementos portland industriales, en la primera, y la influencia que ejerce la adición de diversas cantidades de una escoria vítrea a un cemento portland ambos de fabricación española, en la segunda, cuand…
En los resultados experimentales expuestos bajo este título, en el n.º 173 de esta Revista, mencionábamos la escasez de experiencias sobre las acciones químicas que los iones contenidos en el agua, empleada para amasar las probetas, pueden desarrollar en las armaduras. Agradecemos mucho a la Sra. D. Carmen Andrade, Dr…
El autor se propone, en este muy apreciable artículo, poner de manifiesto que la magnesia en el clínker de portland no es un constituyente "traza" sino que tiene efectos pequeños pero distintos en la calcinación del clínker, diferentes del efecto perjudicial que ejercería en la estabilidad del hormigón, motivo de su l…
Con motivo del Curso de Estudios Mayores de la Construcción "CEMCO-79'' dedicado a la Patología de la Construcción, que se ha celebrado en el Instituto Eduardo Torroja de la Construcción y del Cemento, y al que han asistido diversos ingenieros y arquitectos iberoamericanos, el Dr. José M. Cabrera Garrido pronunció tre…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVibrational and thermal study of antimony oxidesC. A. Cody, L. DiCarlo, and R. K. DarlingtonCite this: Inorg. Chem. 1979, 18, 6, 1572–1576Publication Date (Print):June 1, 1979Publication History Published online1 May 2002Published inissue 1 June 1979https://pubs.acs.org/doi/…
Studies were made on the capacitance-vs-voltage characteristics of ZnO varistors which contain rare-earth metal oxides and cobalt oxide. On the basis of the symmetrical Schottky-barrier model of the grain-boundary region, the barrier height φ and donor concentration Nd of ZnO grains were obtained by the modified 1/C2-…