Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Study of Solvents for Sodium Borohydride and the Effect of Solvent and the Metal Ion on Borohydride Reductions1Herbert C. Brown, Edward J. Mead, and B. C. Subba RaoCite this: J. Am. Chem. Soc. 1955, 77, 23, 6209–6213Publication Date (Print):December 1, 1955Publication Hist…
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Se consideran las distintas fases del proceso de fabricación de este tipo de bloques.
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La determinación del rendimiento térmico de los hornos cerámicos permite fijar si su consumo es excesivo, en cuyo caso se ha de intentar un perfeccionamiento que asegure un progreso o una economía.
Se presentan algunas novedades sobre la construcción de hornos con guía longitudinal forzada, y sobre el empleo de un nuevo tipo de cojinetes» Se comparan las ventajas y defectos de los tubos soldados y roblonados.
Características de la preparación del hormigón sin finos (materiales empleados^ método de elaboración, etc.) y propiedades generales (resistencias mecánicas, resistencia a la penetración del agua, retracción, etc.).
Se describe un sencillo ensayo para determinar la consistencia del hormigón fresco, en función de la penetración de una bola do 15y24 cm de diámetro y 13,608 kg de peso. Se establece vina comparación con el ensayo de asiento.
El secado de los productos de arcilla, en condiciones óptimas, exige la regulación de la velocidad de difusión del agua en el interior del ladrillo y de la velocidad de evaporación. Para lograr tal regulación en los secaderos tonel es preciso introducir ciertas modificaciones en el encañado corriente.
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A mathematical analysis is made of the redistribution of solute which occurs during the solidification, without convection, of a single-phase alloy. Calculations of solute distributions are carried out for steady state conditions, and for the transient changes in solute concentration, both in the solid and in the liqu…
hyde, but the most serious errors arise when small quantities of amino sugar are estimated in the presence
Abstract Analytical expressions for bubble radii and growth rates derived by the authors are applied in an analysis of surface boiling at high heat transfer rates. It is shown that the product of bubble radius and radial velocity is a constant, independent of the bubble radius. This circumstance permits the formulatio…
It is shown that there is a practically one-to-one correspondence between the occurrence, on the one hand, of positive (bonding) and negative (antibonding) overlap populations in LCAO theory and, on the other hand, of bonded attractions and nonbonded repulsions in VB (valence-bond) theory. This correspondence is discu…
Elongated single-magnetic-domain iron particles, 150 angstrom units in diameter, have been prepared with properties that definitely confirm the existence of a shape anisotropy effect on coercive force. This conclusion is based upon four observations: (1) Torque curve analysis shows the predominating anisotropy effect…
The coercive force predicted by theory for single-domain particles with shape anisotropy frequently far exceeds the observed value. From an examination of the results of Paine, Mendelsohn, and Luborsky on elongated iron particles, several approximate models are suggested which may exist in certain experimental situati…
Abstract Squalene was treated with benzoyl peroxide and isoprene‐dialcohol dibenzoate was isolated. It is now proved for the first time that the molecule of polyisoprene was decomposed by a free radical and the location of the scission was the CH 2 CH 2 linkage.
Abstract The relationship between the water‐vapor accessibility of cellulose and its dielectric constant at 10,000 cycles per second and 30°C. has been examined. Six different celluloses were studied. These included a cotton linters, a hydrolyzed cellulose, two regenerated celluloses, and two bleached wood pulps. In t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLithium Absorption by Kaolin MineralsR. Greene-KellyCite this: J. Phys. Chem. 1955, 59, 11, 1151–1152Publication Date (Print):November 1, 1955Publication History Published online1 May 2002Published inissue 1 November 1955https://pubs.acs.org/doi/10.1021/j150533a009https://do…
Abstract Experiments are described in which the temperature dependence of crystallization in natural rubber, unvulcanized and vulcanized by a peroxide, was investigated dilatometrically over the temperature range −37 to 0°C. Avrami type time functions describe the progress of crystallization to a first approximation.…