Materials Literature
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Electron emission from a cathode surface produced by an applied field E is enhanced by the presence of projections on the emitter surface which cause a local increase in E. The nature of this enhancement factor μ(z), which is a function of the distance z from the cathode, is discussed more fully than hitherto and its…
Abstract The coefficient of expansion of elastomer compositions depends on the kind of polymer employed, the volume per cent of polymer plus all other organic materials, and the kind and the amount of pigment present. The specific effects of pigments in retarding the shrinkage are shown. A procedure is given by which…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heat of Combustion of Samarium1Elmer J. Huber Jr., Clayton O. Matthews, and Charles E. Holley Jr.Cite this: J. Am. Chem. Soc. 1955, 77, 24, 6493–6494Publication Date (Print):December 1, 1955Publication History Published online1 May 2002Published inissue 1 December 1955ht…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeats of Formation of Niobium Carbide and Zirconium Carbide from Combustion CalorimetryAlla D. Mah and B. J. BoyleCite this: J. Am. Chem. Soc. 1955, 77, 24, 6512–6513Publication Date (Print):December 1, 1955Publication History Published online1 May 2002Published inissue 1 De…
A new neutron-deficient nuclide, ${\mathrm{Tl}}^{195}$, has been produced by 20-Mev deuteron bombardment of ${\mathrm{Hg}}^{196}$, and its identity and its half-life (1.2\ifmmode\pm\else\textpm\fi{}0.1 hours) have been established by timed chemical separations of the ${\mathrm{Hg}}^{195}$ daughter. The assignment and…
Abstract Es werden die Infrarot‐ und Raman‐Spektren des Urotropins, des Tetramethyl‐hexathia‐adamantans und des Adamantans diskutiert.
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…
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…
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…
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/…
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…
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…
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…
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…
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.
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.