Materials Literature
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An Einkristallen von NaNO 2 wurde bei Zimmertemperatur die Quadrupolkopplungskonstante bestimmt. Es wird ∣ e 2 q Q/h ∣ = 1100,3 ± 0,8 kHz erhalten. Der Asymmetrieparameter η= (φ xx — φ yy )/φ zz ist 0,1092 ± 0,0009. Die Hauptachsen des Quadrupolkopplungstensors fallen mit den orthorhombischen Kristallachsen zusammen,…
The indentation hardness test is being investigated as a means of studying the behavior of rock under stress sufficiently great to be of geologic interest. In this study, indentation and compression of a limestone, marble, anhydrite, and artificial rock salt are compared. Indentation of these rocks with a 136° pyramid…
Abstract Platin verflüchtigt sich beim Erhitzen in Gegenwart von Sauerstoff als Dioxyd. Das Gleichgewicht Pt + O 2 = PtO 2 g wurde zwischen 1107 und 1208°C gemessen. Dafür gilt .
Abstract In continuation of previous kinetic work on the hydrolytic polymerization of εcaprolactam (CL) (Part I–III) in which evidence was obtained that all the predominant reactions are catalyzed by endgroups, special experiments were undertaken in order to study the specific role played by the NH 2 and COOH endgroup…
Abstract Gleichgewichtsmessungen mit der Mitführungsmethode, bei denen Iridium bzw. Iridiumdioxyd im Sauerstoff‐ oder Sauerstoff—Stickstoffstrom erhitzt wurden, führten zu dem Ergebnis, daß die bekannte Flüchtigkeit des Iridiums in Gegenwart von Sauerstoff auf der Bildung des Trioxyds IrO 3 beruht. In Übereinstimmung…
The crystal structure of PbNb2O6 consists of a framework of NbO6 octahedra linked through corners. The Pb2+ ions occupy 5 out of the 6 available interstitial sites in this framework. Single-phase compositions have been prepared by solid-state reactions to yield nonstoichiometric compounds of the form A1+xB2O6 where A…
Paramagnetic susceptibilities of Fe and Fe-Si alloys (5.75, 6.82, 9.45, 12.65, 14.70, 18.11, 20.85, and 24.38 at. % Si) have been measured up to 1200°C. At high temperatures the paramagnetic susceptibilities of bcc Fe-Si alloys obey the Curie-Weiss law, possibly indicating that the contribution due to s-d exchange int…
Abstract Films of low‐density polyethylene which were exposed to a corona discharge in oxygen at a pressure of 1 atm. lost weight and decreased in thickness due to oxidation of the surface to volatile products (principally carbon dioxide and water). The weight loss was directly proportional to the time of exposure and…
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Abstract The polymerization rate of N-carboxy dehydroalanine anhydride (I) was compared with that of N-carboxy Dl-alanine anhydride, and it was found, that the former was much slower than the latter at 30°C. Polydehydroalanine (IV) was obtained by heating the substance I in dry pyridine at 100°C, or by adding a small…
The effect of hardness, surface finish, and grain size upon the compressive rolling-contact fatigue strength of M-50 bearing steel has been studied. Considerable testing on the RC Rig and statistical-treatment methods have been included. A mathematical expression relating these variables to life expectancy is presente…
Design rules proposed rules take account of reduction in strength near welds in heat treated or strain hardened material, at same time taking advantage of strength of material in regions not affected by heat of welding; proposed rules are conservative yet more realistic than previously used design procedures for welde…
This study covers the development of a new basic brick with outstanding resistance to load deformation, slagging, and spalling. This brick is made of 92% high‐purity periclase and 8% high‐purity alumina. During firing for a ceramically bonded brick or in service for a chemically bonded brick, the fine periclase and al…
A Pembina montmorillonite clay has been activated with sulphuric acid at various dosages by the conventional wet process and by the new "dry" process. The products are compared with respect to the fractions of the metal ion components remaining after leaching, the hydrated silica content, the bleaching capacity, and t…
A variety of naturally occurring forms of calcium sulphate dihydrate produce substantially identical differential thermograms under conditions of uniform heating rate and particle size. These thermograms closely resemble those for synthetic dihydrate and β-hemihydrate, showing four endothermic effects and one exotherm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation of Alkene TrithiocarbonatesJohn A. Durden, Harry A. Stansbury, and William H. CatletteCite this: J. Am. Chem. Soc. 1960, 82, 12, 3082–3084Publication Date (Print):June 1, 1960Publication History Published online1 May 2002Published inissue 1 June 1960https://p…
Transmission electron microscopy has been applied to the study of lattice defects introduced by neutron irradiation of graphite. The dark-field technique has proved to be especially useful for this purpose. The technique of preparation is described and a tentative interpretation of the observations is given.
Abstract The course of secondary crystallization in several polymers was investigated by the density balance method. At the end of primary crystallization it was possible to notice a stepwise increase of density with time, which cannot be fitted to the Avrami equation. The stepwise increase of density follow a further…
Calibration curves of X-ray intensity vs specimen thickness have been prepared for the electron probe microanalyzer by using evaporated films of Cr, Mn, Zn, and Au in the 0–5000 A range. For each element, the x-ray intensity increased almost linearly with thickness; for a given thickness, the x-ray intensity increased…
An apparatus is described for the measurement of the frequencies of resonance of longitudinal and torsional vibrations of circular cylindrical rods at temperatures in the range -180 to +195° C. The values obtained have been used to determine the elastic moduli of single crystals of tin over this range of temperature.…