Materials Literature
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A study has been made of the effects of the concentration of dissolved oxygen and temperature on the rate of breakdown of sodium nitrite in the presence of steel, and on the rate of corrosion of the steel. It was found that, at any given temperature, an increase in concentration of oxygen decreased the amount of nitri…
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Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Terrell L. Hill; Physical Adsorption on Non‐Uniform Surfaces. J. Chem. Phys. 1 January 1949; 17 (…
Zirconium metal was heated in nitrogen, oxygen, and air at temperatures ranging from 425 to 1300 C. Observations were made on the gain in weight, micro‐ and macrohardness, and metallographic structures. Nitrogen diffuses into zirconium at a much slower rate than oxygen. A marked increase in penetration of both gases w…
Les auteurs montrent que l'on peut obtenir un quart d'onde quasi achromatique en juxtaposant deux lames cristallines, l'une demi-onde, l'autre quart d'onde pour la région moyenne à achromatiser. L'angle des lignes neutres des deux lames étant de 60 degrés — β (β un angle inférieur à 3,5 degrés dépendant de la nature d…
A class of new phosphors of great technical importance is described, which enables white light to be obtained in fluorescent lamps from a single chemical compound. The new materials are alkaline earth halophosphates activated with antimony and manganese. Luminescent properties are discussed as a function of compositio…
A. F. Wells, Discuss. Faraday Soc., 1949, 5, 197 DOI: 10.1039/DF9490500197
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Abstract Nicht nur niedermolekulare, auch hochmolekulare Verbindungen mit benachbarten, cis‐ständigen Hydroxylgruppen bilden Komplexe mit Borsäure oder Boraten; unter geeigneten Bedingungen entstchen Koordinationsverbindungen aus einem Molekül Borsäure und zwei Diolgruppen. Diese Didiol‐Borsäure‐Komplexe können als Ha…
"Klockmann's Lehrbuch der Mineralogie." Geologiska Föreningen i Stockholm Förhandlingar, 71(1), p. 184
C. H. Bamford and M. J. S. Dewar, J. Chem. Soc., 1949, 2877 DOI: 10.1039/JR9490002877
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalogs of Aspergillic Acid. I. The Tautomerism of the Hydroxypyridine-N-oxidesElliott. ShawCite this: J. Am. Chem. Soc. 1949, 71, 1, 67–70Publication Date (Print):January 1, 1949Publication History Published online1 May 2002Published inissue 1 January 1949https://doi.org/10…
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When Rayleigh's law for small hysteresis loops is interpreted in terms of the elementary process of domain wall displacement, its generalization to include effects of stress becomes possible. In this way theoretical formulas have been derived for the behavior of a soft iron or steel specimen which is first put into a…
W. K. Burton and N. Cabrera, Discuss. Faraday Soc., 1949, 5, 33 DOI: 10.1039/DF9490500033
C. Eaborn, J. Chem. Soc., 1949, 2755 DOI: 10.1039/JR9490002755
Abstract Studies of strategic mineral deposits in the major domestic pegmatite districts by the U. S. Geological Survey from 1939 to 1945, primarily for the purpose of increasing production of mica, beryllium, lithium, and tantalum minerals, resulted in the clarification of many problems related to the general. featur…
In view of mis-statements made in the literature, the origin of the refractive index in electron optics is discussed in some detail, and the uniqueness of an expression previously given is demonstrated. On this basis, some general properties of electron optics are investigated. A relation between ray direction and wav…
The resolving power of the electron microscope and the contrast in the image are calculated for different conditions of focusing, illumination and aperture. These conditions can change the limit of resolution by a factor of about 3. The contrast in the image of an atom is appreciably increased by defocusing and spheri…