Materials Literature
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Se realiza un estudio de los conocimientos actuales sobre el problema de la heladicidad de los materiales de construcción. Se presentan los resultados de los ensayos realizados en los últimos años y se ofrece una posible teoría de la acción del hielo sobre los productos cerámicos. Finalmente, se indican las conclusion…
Mediante la ventilación de los secaderos de estanterías se consigue conservar, en verano, el bajo precio del secado natural, y obtener, en invierno un precio comparable al del secado artificial.
El efecto nocivo de la mica depende tanto de la cantidad como del tamaño de las laminillas. Para fracciones gruesas, una adición de un 1% disminuye ya la resistencia del mortero; para la fracción más fina una adicción del 3% no actúa desfavorablemente, pero si una adición de 5%.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion and Heat Exchange in Chemical Kinetics.O. A. HougenCite this: J. Am. Chem. Soc. 1956, 78, 4, 885–886Publication Date (Print):February 1, 1956Publication History Published online1 May 2002Published inissue 1 February 1956https://pubs.acs.org/doi/10.1021/ja01585a059h…
Abstract Long-chain polymer molecules are approximated by a model consisting of isodimensional segments which tend to arrange themselves in co-linear succession. A fraction f of the bonds is assumed to be ‘bent’ out of the co-linear direction of preceding segments. The fact that the free energy of solution derived usi…
Abstract The pyrolysis of ethane, ethylene and mixtures of the two gases, has been studied by heating the reactants to 600° C for short time intervals and measuring the products of reaction by chemical analysis. In the case of ethane, the first products are ethylene, hydrogen and a small amount of methane. This reacti…
酢酸ビニル (M1) と酢酸イソプ・ペニル (M2) の混合割合を98: 2, 95:5, 90:10および80:20として接触塊状重合し, その共重合物を鹸化することにより, ビニルアルコールとイソプロペニルアルコールの共重合物を得た。この共重合物は以下説明するように, 通常のポリビニルアルコール (PVA) に比し, わずか2ないし5モル%程度の少量のイソプロペニルアルコールを含有するものでもかなり顕著な性質の相違がみられるので, これをイソプロペニル変性ポリビニルアルコール (P-PVAと略記する) と名付ける。P-PVA皮膜を100, 120, 140, 160および180℃に熱処理し, 30および50℃の水に対する溶解性…
The dilatation-orientation of cold-rolled aluminium sheets in the range from room temperature to 350°C was measured by the newly devised dilatometer.The results are as follows:i. Cold-rolled aluminium sheets showed marked anisotropy in their thermal dilatation.ii. All dilatation curves showed two anomalous stages.iii.…
On développe une théorie quantitative des temps de relaxation en Résonance Quadrupolaire, en supposant un modèle mécanique simple des vibrations moléculaires responsables du couplage spin-milieu. Tout est déduit à partir des constantes de force et de couplage de ce modèle, déjà plus ou moins accessibles par l'effet Ra…
Abstract The platinum‐catalysed autoxidation of ethanol in water has been studied with 18 O as a tracer. The reaction product was isolated as barium acetate and converted t o CO 2 for mass‐spectrometric 18 O analysis. It is found that the 18 O from O 2 gas is not significantly incorporated into the product but with H…
Electrical conductivity of carbon black‐reinforced elastomers at fixed loading is a function of the particle size and aggregation habit of the carbon black, its intrinsic conductivity, and the ability of the black to adsorb certain ionic impurities. These factors vary greatly in their relative importance, depending on…
A quarter-wave transformer to match the junction between an empty waveguide and one completely filled with a dielectric may be made from a waveguide partially filled with dielectric. A method of designing such a transformer, when all the waveguides have the same cross-section, is described, and experimental results ar…
The effects of certain impurities on the room temperature ductility of chromium have been investigated. Results indicate that nitrogen in amounts <0.01% raises the bend transition temperature of annealed material above room temperature. No effect of oxygen on the ductility in amounts <0.3% was found. Sulfur in amounts…
1. The field observations on the vegetation and sexuality of Codium fragile have been made for several years during 1940-1949 and 1951-1953 in the central region of the Pacific coast of Japan.The young plants begin to appear during early winter and spring, then they become luxuriant during early summer and late autumn…
A method is described for determining the corona-starting voltage in air-solid dielectric systems when the thickness and the dielectric constants are known. The method is derived by applying data from Paschen's law to the theoretical distribution of a voltage potential between air and a solid insulation. Two procedure…
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The behavior of metals and alloys under neutron irradiation in a reactor is investigated. An explanation of how damage originates from the collision and absorption of neutrons by nuclei, and a description of the behavior of the fast ions, produced from these neutron encounters, as they penetrate the surrounding materi…
Equipment is described for impact testing of yarns longitudinally and also transversely. The impact velocities range from 1000 to 10,000 ft per min. The corresponding rates of straining at impact range from 50,000 to 500,000 per cent per min for textile yarns. The impact events are recorded with a high-speed motion pi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation of Monobromosilane and Organic Silyl DerivativesHerman E. Opitz, John S. Peake, and W. H. NebergallCite this: J. Am. Chem. Soc. 1956, 78, 2, 292–294Publication Date (Print):January 1, 1956Publication History Published online1 May 2002Published inissue 1 Janua…