Materials Literature
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A comprehensive study of ZnS:[Zn] and ZnS:[Zn]: Cu phosphors has been carried out with the use of glow curves, phosphorescence emission decay curves, and spectral distribution curves of emission during excitation by 3650A ultraviolet. The principal contributions of the study are (1) glow curves and spectral emission c…
A new electron microscope of greatly simplified design has been constructed. The instrument has a resolution of 100 Angstroms, yet is small enough to be mounted on a desk or laboratory table. Magnetic lenses are energized by permanent magnets. An accelerating voltage of 50 kilovolts is varied over a narrow range to pr…
After a brief review of the relative viscosity/volume concentration relationships which have been suggested for suspensions of smooth spheres, the results of new experimental work on rigidly defined systems of methyl-methacrylate spheres suspended in aqueous solutions are described and discussed. It is shown that, alt…
Versuche mit Weicheisenkugeln von 19 und 40 mm Dmr. über den Einfluß einer Zunder‐ und Salzschicht auf den Abkühlungsvorgang in einer Salzschmelze, einer hochkonzentrierten Salzlösung, in Ölen und Wasser. Härtungsversuche an Stählen mit 0,58 bis 1,0% C in den gleichen Härtemitteln. Bedeutung der Silberkugel‐Kennkurve.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Properties of the Compound BPO4F. A. Hummel and T. A. KupinskiCite this: J. Am. Chem. Soc. 1950, 72, 11, 5318–5319Publication Date (Print):November 1, 1950Publication History Published online1 May 2002Published inissue 1 November 1950https://doi.org/10.1021/ja01167a5…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on the Schardinger Dextrins. VI. The Molecular Size and Structure of the γ-Dextrin1Dexter French, Doris W. Knapp, and J. H. PazurCite this: J. Am. Chem. Soc. 1950, 72, 11, 5150–5152Publication Date (Print):November 1, 1950Publication History Published online1 May 200…
The previously published analysis (see reference 1) of the dependence of efficiency of substitutionally activated inorganic phosphors on activator concentration is generalized to include a wide variety of inorganic phosphors under various types of excitation. In addition to the optical excitation of the activator, the…
The effect of various variables, such as type of stress, stress magnitude, duration of stressing, and environment on the initiation and development of crazing in linear polymers is discussed. The basic nature of crazing is investigated in some detail for polystyrene specimens by means of the light microscope, the elec…
The influence of a transverse magnetic field on the conduction properties of thin metallic films, of thickness comparable with the free path of the conduction electrons, is investigated. It is shown that, owing to scattering of electrons at the boundaries of the film, the Hall coefficient is increased, and the electri…
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