Materials Literature
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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-…
Abstract not Available.
Having revised and updated his classic History of Tribology, Duncan Dowson - the father of tribology - takes his account of the subject from the earliest times to include the latest developments up to and including the present day. Illustrated with photographs, diagrams, and line drawings.
We have used Fermi-surface pressure-derivative measurements at 2 K and singlecrystal and powder x-ray studies as a function of pressure at room temperature to demonstrate that recently published anomalous Fermi-surface and lattice properties of Re${\mathrm{O}}_{3}$ are related to a novel second-order phase transition.…
A theory of non-Ohmic conduction from depinning of charge-density waves by an electric field is presented. It is based on Zener-type tunneling of the charge-density waves across a gap at the Fermi surface that is determined by the pinning frequency. The theory applies to relatively pure specimens for which the pinning…
The observation of band-to-band luminescence from an amorphous solid ($a$-${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$) shows the existence of localized states at energies considerably above the mobility edge.
Two new effects associated with Fr\"ohlich sliding-mode conductivity have been observed in Nb${\mathrm{Se}}_{3}$. First, nonlinear resistance is observed only after a well-defined threshold field is reached. Second, electric fields above the threshold result in noise in the potential difference across a current biased…
Trapped charges related to thermoluminescence (TL) glow peaks appearing at high temperatures (⪆ 500 °C) can be transferred to empty trapping centres producing TL glow peaks at lower temperatures by incidence of UV photons. The phototransferred thermoluminescence (PTTL) produced in this way in a natural CaF2 sample is…
The absorption spectra of thin layers of the non-cubic alkaline earth halides BaCl2, BaBr2, BaI2, SrBr2, BaFCl, BaFBr, BaFI, SrFCl, SrFBr, and of the cubic SrCl2 are measured in the vacuum ultraviolet up to 10 eV. For the mixed halides additionally the reflection spectra of single crystals are measured. Halogen double…
Transmission and photoluminescence spectra are investigated of GaSe1−xTex and Ga1−xInxSe crystals in the temperature range 4.2 to 100 K. It is shown that low temperature radiative recombination in these crystal is mainly due to direct bound exciton decay. In the temperature range 10 K < T < 77 K radiative recombinatio…
Electrical switching in thin selenium films is studied. Devices with two metal electrodes are compared with those having one indium oxide contact. dc, single, and double pulse studies are utilised in conjunction with scanning electron microscopy in an attempt to investigate the structural and compositional changes occ…
Domain configurations in the β-phase of MoTe2 are analysed by electron diffraction and imaging techniques, and related with the α → β phase transition. Structural models are proposed for the orientation variants giving rise to ortho-, meta-, and para-type boundaries, and for translation variants occurring in β-MoTe2.…