Normalización del cemento. Resistencias mecánicas: Algunos comentarios sobre el método de ensayo
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Materials Literature
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Aplicaciones prácticas de la espectroscopía de absorción infrarrojo en el estudio de los crudos, del clínker y del cemento portland anhidro (Continuación)
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Influencia del tamaño de las partículas sobre la expansión causada por lo reacción sílice-álcali
Método de ensayo patrón para medir la expansión potencial de morteros de cemento portland, expuestos a la acción de los sulfatos
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Empleo de un superplastificante en la producción normal de hormigón
Valoración cuantitativa de CaSO4 total en el yeso crudo o calcinado mediante la singenita
Actividad puzolánica del polvo de sílice
Single-crystal elastic constants of the equiatomic NiTi alloy near the martensitic transformation
The elastic constants measurements have been made for the first time on a single crystal of the near-equiatomic NiTi alloy. The results show that the elastic constants C′ and C44 both have a low value and a positive slope with temperature; this behavior makes NiTi unique in the class of alloys showing a martensitic tr…
Molecular Interpretation of the Glass Transition Temperature of Polymer-Diluent Systems
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Interpretation of the Glass Transition Temperature of Polymer-Diluent SystemsT. S. ChowCite this: Macromolecules 1980, 13, 2, 362–364Publication Date (Print):March 1, 1980Publication History Published online1 May 2002Published inissue 1 March 1980https://pubs.acs.o…
Rubber-Thermoplastic Compositions. Part I. EPDM-Polypropylene Thermoplastic Vulcanizates
Abstract Thermoplastic elastomers are rubbery materials which can be fabricated by techniques usually associated with thermoplastic resins. Classical elastomers rely upon the crosslinked network, developed during vulcanization, to provide the retractive forces of rubber type elasticity. Thermoplastic elastomers contai…
Mechanism of pulsed surface flashover involving electron-stimulated desorption
A simple model is proposed to explain how a breakdown avalanche of secondary emission electrons can lead to surface flashover when an insulator in vacuum breaks down a few nanoseconds after high voltage is applied. The case of a plane insulator–vacuum interface perpendicular to parallel electrodes is considered. Posit…
Equivalent Linearization for Hysteretic Systems Under Random Excitation
A method of equivalent linearization for smooth hysteretic systems under random excitation is proposed. The hysteretic restoring force is modeled by a nonlinear differential equation and the equation of motion is linearized directly in closed form without recourse to Krylov-Bogoliubov technique. Compared with previous…
Plane nets in crystal chemistry
Abstract In the present paper we consider not only the simplest periodic nets (such as arise from the equivalent circle packings of Niggli, Fejes Toth and others) but also less regular ones, ignored by mathematicians but nevertheless of widespread occurrence and usefulness in crystal chemistry. After a general introdu…
Isotopic Disequilibrium of Uranium: Alpha-Recoil Damage and Preferential Solution Effects
Preferential loss of uranium-234 relative to uranium-238 from rocks into solutions has long been attributed to recoiling alpha-emitting nuclei. Direct evidence has been obtained for two mechanisms, first, recoil ejection from grains, and now release by natural etching of alpha-recoil tracks. The observations have impl…
Properties of poly(vinyl chloride) modified with thermoplastic polyurethane elastomers
Abstract Some properties of poly(vinyl chloride) (PVC) and mixtures of PVC and polyurethanes (PUs) are discussed. Six different PUs of varying molar ratios of NCO/OH, and differing in the kind of glycol used as a chain extender were used as modifiers. It has been found that PVC modified with PUs has a lower tensile st…
A correlation between the infrared absorption features and the low temperature thermal conductivity of different types of natural diamonds
The low-temperature thermal conductivity of three different types of natural diamond has been measured between 0.5 and 20K. It has been attempted to relate the infrared absorption features of the diamonds with their thermal conductivity. A diamond with only B features (i.e. no B' peak) in the infrared was found to con…
Etude structurale et magnétique de CoMnP3)
L'ordre cristallographique est complet dans CoMnP, c'est-à-dire le cobalt se situe en site tétraédrique et le manganèse en site pyramidal. La structure magnétique est essentiellement ferromagnétique de par l'arrangement des moments de manganèse (2,55 μB). L'introduction de manganèse dans les sites pyramidal puis tétra…
Dislocation cell formation during plastic deformation of copper single crystals
Tapered copper single crystals oriented for single slip are deformed plastically at room temperature and at 77 K. TEM investigations at resolved shear stress levels of 20, 30, and 40 MPa in the same crystal are used to follow the development of the dislocation structure with increasing deformation. Both, an open cell…
Electrical properties ofNi1−xCoxS2
We report results of electrical-conductivity, thermoelectric-power, and optical experiments on single crystals of ${\mathrm{Ni}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{\mathrm{S}}_{2}$ ($0\ensuremath{\le}x\ensuremath{\le}0.12$). The results cannot be explained by means of a conventional one-electron model. However, if it…
Chemical vapor deposition of ZnO epitaxial films on sapphire
A chemical vapor deposition system for the growth of epitaxial (112̄0) ZnO films on (011̄2) sapphire, employing the reaction of zinc vapor and carbon dioxide, was investigated. Growth rates as high as 30 μm/h at a substrate temperature of 700-750 °C were achieved. Films grown on substrates with thin presputtered layer…