The system K 2 O-Al 2 O 3 -SiO 2
We have learnt that the eleven varieties of Minims (Smith & Nephew Pharmaceuticals) which we listed are no longer made. The makers plan to introduce a much improved form of Minims later this year.
Materials Literature
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A Study of Solvents for Sodium Borohydride and the Effect of Solvent and the Metal Ion on Borohydride Reductions 1
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…
Utilisation de déchets de mica pour la fabrication de briques, tuiles, ou objets similaires isolantes
No disponible
Clinker blocks. The modern walling units
Se consideran las distintas fases del proceso de fabricación de este tipo de bloques.
Manual of cement testing
No disponible
Rendement thermique des fours
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.
Fragen der konstiukition und reparatur von drehöfen
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.
No-fines concrete. An account of the characteristics and properties of no-fines concrete and its use under australianan conditions
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.).
Ball test for field control of concrete consistency
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.
Practical aspects of clay product drying
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.
Nuevo procedimiento para fabricar cemento Portland
No disponible
A MATHEMATICAL ANALYSIS OF SOLUTE REDISTRIBUTION DURING SOLIDIFICATION
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…
The amino acid composition of mammalian collagen and gelatin
hyde, but the most serious errors arise when small quantities of amino sugar are estimated in the presence
Dynamics of vapor bubbles and boiling heat transfer
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…
Electronic Population Analysis on LCAO-MO Molecular Wave Functions. IV. Bonding and Antibonding in LCAO and Valence-Bond Theories
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…
Effect of Shape Anisotropy on the Coercive Force of Elongated Single-Magnetic-Domain Iron Particles
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…
An Approach to Elongated Fine-Particle Magnets
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…
Studies on the mechanism of mastication of rubber. IX. Scission of squalene molecule with benzoate free radical
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.
The relationship between the dielectric constant and water‐vapor accessibility of cellulose
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…
Lithium Absorption by Kaolin Minerals
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…