Materials Literature
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Abstract A general approach to spin-lattice relaxation is given for salts to which a crystalline field theory is appropriate. In particular, the theory of Elliott & Stevens for the interaction of a rare-earth ion with static ionic surroundings is generalized phenomenologically to represent the interaction of the r…
Procedures and tests are described whereby it is shown that radium in ferrous metal scrap is virtually all removed in the slag on remelting. The smelting of radium-contaminated ferrous scrap can be performed with safety for the workers by use of proper ventilation and other simple precautions. The purified ferrous met…
The main parameter used to describe the geometry of the crimp of a fiber is the crimp diameter. This corresponds to an average amplitude of the fiber in space while the fiber is kept in a static position of stress. In order to measure the crimp diameter, it is necessary to measure the coordinates of a sufficient numhe…
When a transverse rf magnetic field is applied to a ferromagnetic insulator, a second harmonic frequency term arises in mz (the axial or longitudinal component of the rf magnetization). If in addition an axial component of the rf field is applied, then a second harmonic frequency term appears in mt (the transverse com…
During the joint meeting of the British Phycological Society and the Soci~t~ Phycologique de France held in the Channel Islands in September 1960 a number of excursions were made to various localities in Guernsey, Herm and Sark.Algal records collected during these excursions are listed below.It should be realised that…
The polarized infrared absorption spectrum of single crystals of Am+3(5f6) in LaCl3 has been studied from 0.79 to 16.0 μ. In almost every instance the spectrum is sharp and completely polarized, and appears in definite groupings. Transitions from the ground level, 7F0, to excited levels of the ground term, 7F1, 7F2, 7…
Fiber configuration in sliver and the incidence of hooks in sliver and rovings have been studied, employing two different techniques. It has been established that during the drafting of sliver at draw frames, trailing hooks are removed preferentially as com pared to leading hooks. The direction of presentation of hook…
The rolling-contact fatigue properties of crystallized glass ceramic balls together with AISI M-1, AISI M-50, Halmo, and WB-49 alloy steel balls tempered to various hardness levels were determined in the NASA spin rig and in the five-ball fatigue tester. A continuous increase in fatigue life and load capacity for each…
Recounts the discovery of the drug germanin and its application to reduce deaths among animals and humans due to sleeping sickness in the tropics.
Abstract The progressive reaction of ozone with surfaces of natural rubber ( cis ‐polyisoprene) has been studied by means of replica electron microscopy. Unstrained rubber suffered surface degradation at a rate consistent with the predictions of a theory of diffusion with simultaneous chemical reaction. In strained su…
Abstract The infrared transmission of the plastic polyvinylidene fluoride has been measured. Normal and thermally decomposed samples were used. Bands yielding information on phase transitions and behavior during pyrolytic decomposition have been observed. The mechanism of thermal degradation is briefly discussed. Abso…
Pyrochlore and betafite were investigated from several types of Canadian occurrences. Nine new analyses for 20 constituents and 11 analyses for 8 constituents are presented. A general formula A 16 -xB 16 (O,OH) 48 (F,OH) 8 is proposed for the pyrochlore-betafite series with x representing vacant sites in the unit cell…
Abstract A Tarassov function has been used to estimate the specific heat of polystyrene between 0° and 60°K. These data, together with published C p data, have been used to calculate the entropy, enthalpy, and free energy of styrene and polystyrene from 0° to 298.16°K. The entropy of polymerization of styrene at 298.1…
Die Selbstdiffusion von Uran in UO 2 -Sinterkörpern wurde mit Hilfe der a-Strahlungsabsorption sowie durch direkte Messung der (durch Diffusion sich einstellenden) Konzentrationsverteilung von U-233 bestimmt. Für Wasserstoffatmosphäre und im Temperaturbereich 1300 —1600°C gilt: D = 0,23 exp( —104,6 kcal/R T) cm 2 sec…
The reaction of benzene with oxygen atoms produced by mercury photosensitized decomposition of nitrous oxide has been studied in a circulating system at room temperature. The main reaction product is a non-volatile material probably largely aldehydic in character. This is tentatively assumed to result from the rearran…
The dielectric behavior of KNO 3 crystal was investigated. Mainly in its ferroelectric phase III, which appears in the temperature range of about 125∼115°C on cooling, the D - E hysteresis loop along the c axis was observed by the usual Sawyer-Tower method using the 50 c/s a c electric field, the pyroelectric current…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE BISULFATE ACID CONSTANT FROM 25 TO 225° AS COMPUTED FROM SOLUBILITY DATA1M. H. Lietzke, R. W. Stoughton, and T. F. YoungCite this: J. Phys. Chem. 1961, 65, 12, 2247–2249Publication Date (Print):December 1, 1961Publication History Published online1 May 2002Published iniss…
Abstract The crystal structure of polyketone (1:1 ethylene/carbon monoxide copolymer) obtained by γ‐irradiation copolymerization of ethylene and carbon monoxide was determined by x‐ray diffraction. An orthorhombic unit cell was found, having space group D (Pnam) of dimensions a = 7.97, b = 4.76, c (fiber axis) = 7.57…
The original theory of thermally stimulated emission is extended to include the effect of a temperature dependent trapping cross section. A method is proposed whereby the ionization energy and temperature dependent capture cross section of a set of identical trapping states may be determined from the half-width and sh…
Measurements have been made of the electrical resistivity and the Hall constant of the carbides of the fourth and fifth group transition metals at room temperature in order to clarify the electronic structure of these compounds. The Hall coefficients are of the order of -10 -3 coul -1 cm 3 for the fourth group carbide…