Die Infrarot‐ und Raman‐Spektren hochsymmetrischer Moleküle mit Urotropinstruktur
Abstract Es werden die Infrarot‐ und Raman‐Spektren des Urotropins, des Tetramethyl‐hexathia‐adamantans und des Adamantans diskutiert.
Materials Literature
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The Preparation of a Strontium-Niobium Bronze with the Perovskite Structure1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation of a Strontium-Niobium Bronze with the Perovskite Structure1Dana Ridgley and Roland WardCite this: J. Am. Chem. Soc. 1955, 77, 23, 6132–6136Publication Date (Print):December 1, 1955Publication History Published online1 May 2002Published inissue 1 December 195…
Structural Behavior in the System (Ba, Ca, Sr) TiO 3 and Its Relation to Certain Dielectric Characteristics
The effect of strontium additions on the immiscibility region between barium titanate and calcium titanate was studied and it was found that the two‐phase gap is closed by about 18% strontium titanate when the specimens are fired at 1430°C.; at lower firing temperatures the gap is greater and there is evidence of inco…
Ferroelectric Hysteresis in Barium Titanate Single Crystals
The properties of the dynamic hysteresis loop of a c-domain BaTiO3 single crystal are examined as a function of temperature. Experimental results indicate that the coercivity and hysteresis losses decrease sharply as the crystal passes through a phase transition to a lower order of symmetry. This occurs without a subs…
Hot Pressed Boron Nitride
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHot Pressed Boron NitrideK. M. TaylorCite this: Ind. Eng. Chem. 1955, 47, 12, 2506–2509Publication Date (Print):December 1, 1955Publication History Published online1 May 2002Published inissue 1 December 1955https://pubs.acs.org/doi/10.1021/ie50552a039https://doi.org/10.1021/…
Modification of the Peierls-Nabarro Model for Edge Dislocation Core
The various assumptions implicit in the Peierls-Nabarro treatment of the core of an edge dislocation are critically reviewed. It is pointed out that the lattice barrier for dislocation motion, for the case where atom rows alternate along the slip plane, has twice the period and a much higher amplitude than for the cas…
Formation of Color Centers in Glasses Exposed to Gamma Radiation
Glasses exposed to gamma radiation develop a visible absorption band similar to the F ‐band developed in alkali halide crystals. The function of cerium in preventing coloration of glass was studied in detail in an ultraviolet‐transmitting phosphate base glass in which its characteristic absorption could be measured. W…
The Crystal Structure of Some Rare Earth Hydrides
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Crystal Structure of Some Rare Earth HydridesC. E. Holley Jr., R. N. R. Mulford, F. H. Ellinger, W. C. Koehier, and W. H. ZachariasenCite this: J. Phys. Chem. 1955, 59, 12, 1226–1228Publication Date (Print):December 1, 1955Publication History Published online1 May 2002Pu…
Macro Rings. XII. Stereochemical Consequences of Steric Compression in the Smallest Paracyclophane1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacro Rings. XII. Stereochemical Consequences of Steric Compression in the Smallest Paracyclophane1Donald J. Cram and Norman L. AllingerCite this: J. Am. Chem. Soc. 1955, 77, 23, 6289–6294Publication Date (Print):December 1, 1955Publication History Published online1 May 2002…
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.
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