Materials Literature
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As a continuation of an earlier work, SrS phosphors, singly activated with rare-earth ions have been excited with uv irradiation, at 77°K. The resultant visible fluorescent emissions have been measured and correlated with crystal field splittings of energy levels. Energy level diagrams are presented with possible term…
A brief review of investigations relating fiber structure to mechanical properties of cotton is given. The relationship of fibril alignment, as measured by the x-ray technique, to the strength and elongation properties of cottons covering a wide range in physical properties is discussed. Alteration of mechanical prope…
Mass attenuation coefficients have been measured for aluminum and copper in the energy range of 6 kev to 40 kev and for chromium, cobalt, nickel, and zinc in the energy range of 6 kev to 14 kev. The average most probable error is less than 3% and the agreement with theory is good.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome New Sulfur-bearing Fluorocarbon Derivatives1,2Richard D. Dresdner and John A. YoungCite this: J. Am. Chem. Soc. 1959, 81, 3, 574–577Publication Date (Print):February 1, 1959Publication History Published online1 May 2002Published inissue 1 February 1959https://pubs.acs.o…
Die Atom- und Elektronenwärme des Molybdäns und Wolframs wird zwischen 10°K und 273°K an zwei kompakten Versuchskörpern gemessen, die eine Reinheit von 99,99% aufweisen. Die neueren Angaben verschiedener Beobachter stimmen gut untereinander überein. Die Standardentropien für 25°C ergeben sich zu 6,83 Clausius für Moly…
The room temperature yield end fracture stresses have been measured for a series of high-purity polycrystalline molybdenum tensile specimens with grain diameters varying from 0.03 mm to 0.26 mm. The yield stress results can be fitted to Petch's relation [sgrave]Y =[sgrave]I+kYl−1/2 with [sgrave]I= = 11.00 kg mm−l and…
Recent lifting of the security restrictions now permits publication of measurements of various effects of pressure on plutonium made during the war. Compressions on the alpha phase were measured at room temperature to 40 000 kg/cm2 in one apparatus and to 100 000 in another. The total volume compression under 100 000…
A systematic experimental study has been made of the effect of adding small amounts of gold to copper on the dislocation damping in copper measured at 37 kc in longitudinal resonance. The results have been classified in terms of the dependence of the damping on strain amplitude and time with temperature and compositio…
Abstract The effects of pH and concentration on foam separation of the protein bovine serum albumin (BSA) from solution has been studied. All results agree, at least qualitatively, with theory. BSA maximum enrichments were observed at the isoelectric pH and enrichment ratio was found to increase with decreasing protei…
Abstract On the basis of our experimental data and a detailed kinetic analysis, the following mechanism of hydrogen ion catalysis is proposed for polyesterification as well as for the simple esterification reactions: magnified image The kinetic equation in terms of [COOH] (= C ) is where C 0 = [COOH] and r = [COOH]/[O…
A new crystalline variety of B 2 O 3 has been prepared at pressures above 22,000 atmospheres and above 400°C. The properties are listed. These moderate pressures also are sufficient to catalyze the crystallization of the more common hexagonal form from B 2 O 3 glass. Pressures, however, of up to 50,000 atmospheres wil…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of Hydrothermal Quartz Crystallization1R. A. LaudiseCite this: J. Am. Chem. Soc. 1959, 81, 3, 562–566Publication Date (Print):February 1, 1959Publication History Published online1 May 2002Published inissue 1 February 1959https://pubs.acs.org/doi/10.1021/ja01512a013h…
From a single crystal of manganese ferrite, specimen cores have been cut which are capable of supporting single domain walls. These cores have been proportioned in two ways, one favoring a movable (110) wall, the other favoring a wall system perpendicular to the (110) plane. The basic experiment consists in applying r…
The room-temperature optical transmission spectra of pure and doped SrTi${\mathrm{O}}_{3}$ crystals have been studied after heating them in oxygen and vacuum; spectral measurements were made in the quantum energy range from 0.1 to 3.4 ev.A blue color, with strong attendant absorption in the infrared, can be induced in…
To furnish a greater choice of film materials for application in optical multilayer coatings, the optical properties of evaporated rare earth compounds such as Y2O3, La2O3, Pr6O11, Nd2O3, Sm2O3, Gd2O3, LaF3, NdF3, and CF3 were studied in the wavelength region from 0.22 micron to 2 microns. The materials were evaporate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Structure of Dihydrogen Ethylenediaminetetraacetatoaquonickel(II)1Gordon S. Smith and J. L. HoardCite this: J. Am. Chem. Soc. 1959, 81, 3, 556–561Publication Date (Print):February 1, 1959Publication History Published online1 May 2002Published inissue 1 February 1959https…
Article Notizen: Über die Reaktion aluminiumorganischer Verbindungen mit Organo(poly)siloxanen. Alkylaluminiumsilanolate was published on February 1, 1959 in the journal Zeitschrift für Naturforschung B (volume 14, issue 2).
Abstract Previous work has demonstrated that the degree of crystal perfection in kaolinite can be correlated with many physical properties. In this paper some further relationships are shown, including surface area, base exchange capacity, total percentage of iron and titanium, and high-temperature mullitization. Surf…
The prediction, from dynamical considerations, that floating fibres may take up velocities intermediate between those of the back and front rollers is confirmed by high-speed photographic studies. The failure of Ichino and Kurosaki8 to observe such velocities is explained in terms of the experimental conditions select…
Further studies were made on the effect of the nature of the atmosphere on the wetting of gold and platinum by sodium disilicate at 1000°C. The gases were oxygen, nitrogen, carbon dioxide, helium, argon, water vapor, carbon monoxide, hydrogen, and several mixtures of some of these gases. Data reported were obtained in…