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BaFe12O19 particles were prepared by chemical precipitation and ordinary powder metallurgy methods. These particles were oriented in paraffin wax and the angular variation of coercive force was measured. By using the modified equation of Buessem et al., its variation was analyzed. It was found that reverse-domain nucl…
Stress-strain data were obtained over a wide range of grain sizes for brass, copper and aluminium. A Hall-Petch relation was found not to describe work hardening in the cases of copper and aluminium. An approach to poly-crystal work hardening, based in part on Ashby's concepts, was also unsuccessful in describing the…
Abstract The empirical pseudopotential method is used to compute the band structure, density of states, and reflectivity of hexagonal zinc oxide. The local approximation is assumed, on the basis of recent photoemission experiments which showed that the zinc core 3d band lies deep below the valence band. The calculatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectric field effects on oriented molecules and molecular crystalsRobin M. HochstrasserCite this: Acc. Chem. Res. 1973, 6, 8, 263–269Publication Date (Print):August 1, 1973Publication History Published online1 May 2002Published inissue 1 August 1973https://pubs.acs.org/doi/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of octaethylporphyrin. Comparison with other free base porphyrinsJoseph W. Lauher and James A. IbersCite this: J. Am. Chem. Soc. 1973, 95, 16, 5148–5152Publication Date (Print):August 1, 1973Publication History Published online1 May 2002Published inissue 1 August 1…
Abstract PACS, a computer program to simulate very slow settling of rigid equal spheres into a randomly packed bed, is described. Simulated packings of 6,000, 10,000, and 15,000 spheres are anisotropic. Mean void fraction is 0.42 and mean number of nearest neighbours 6.0. There are numerous cases of four spheres arran…
SUMMARY This paper is concerned with methods for obtaining three‐dimensional (3D) information from scanning electron microscope (SEM) images. It may come as a surprise that this topic merits separate discussion, because, it is generally accepted that every SEM image of a rough surface using the secondary electron emis…
Thermoelastic martensitic transformation has been studied by the analysis of stress-strain curves in binary Au-Cd alloys, containing 46·5, 47·5, 48·5, 49, 49·5, and 50 at. % Cd, respectively. The pseudoelastic characteristics, i.e. superelastic and ferroelastic behaviour upon tension compression test and that the orig…
We have measured the temperature dependence of the thermal diffusion factor αT of argon and krypton isotopes from approximately 200 to 900 °K thereby extending experimental determinations from 250 to 300 ° higher than heretofore. Furthermore, we observed that αT for krypton at low temperatures was nearly twice as larg…
The stress corrosion cracking (SCC) characteristics of ASTM A517 Grade F steel in liquid ammonia environments have been investigated. Acceleration of the cracking process was accomplished at 150 psig by the use of a dynamic slow strain rate testing procedure capable of producing cracking in as little as 24 hours. Test…
The transition temperature of Nb${\mathrm{Se}}_{2}$ as a function of the concentration of such paramagnetic impurities as Fe, Ni, and Co shows a very strong anomaly close to the critical concentration which destroys superconductivity. The strength of the effect in Nb${\mathrm{Se}}_{2}$ is believed to be caused both by…
Laser‐induced Raman spectra were obtained for powders and multidomain single crystals of PbZrO 3 at room temperature. Factor‐group analysis was used to interpret the spectra on the basis of the space group C 2v 8 ‐Pba 2. Raman spectra were also observed for single crystals of PbZrO 3 at several other temperatures betw…
Abstract The adsorption of thiourea on iron cathodes has been studied in 0.1 N sulphuric acid solution containing 10 −1 and 10 −2 Mol of thiourea at 30, 40 and 50 °C. The surface coverage has been calculated by comparing current density (at constant potential and temperature) of solutions with and without inhibitor. T…
Correlation of chemistry of mineral series with mineral associations and geologic occurrences, Nevada, California, Montana
Efforts to relate metal-complex stability constants to some property of the metal ions involved have led to the development of a correlating numerical index Q with the following characteristics: (i) Q is a two parameter quantity involving ionic charge and electronegativity, which may assume different values for a part…
Dislocation loops formed in zirconium after neutron irradiation and subsequent annealing between 450° and 500°C are not pure edge loops. A general method for analysing such loops by transmission electron microscopy is discussed briefly and a technique for determining the loop plane normal to within ± 5° is described.…
As part of a study on reuse of plastics as blends, the yield tensile strength, elongation at break, and the modulus of melt blends of low-density polyethylene, high-density polyethylene, and polypropylene have been studied over the entire ternary composition range. The modulus and strength are nearly monotonic functio…
The effects of temperature and pressure on the static dielectric constant and lattice parameter of KTa${\mathrm{O}}_{3}$ have been measured. Combined with literature data, the present results allow a determination of the pressure and temperature dependence of the soft-ferroelectric-mode frequency ${\ensuremath{\omega}…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHammett acidity function for some superacid systems. II. Systems sulfuric acid-[fsa], potassium fluorosulfate-[fsa], [fsa]-sulfur trioxide, [fsa]-arsenic pentafluoride, [sfa]-antimony pentafluoride and [fsa]-antimony pentafluoride-sulfur trioxideR. J. Gillespie and T. E. Pee…
We have shown that the correct variational equations for the general SCF orbitals are [Fi−Σj |ψj〉 〈 ψj |Gji] |ψi〉=0, where Gji=λjiFj+(1−λji)Fi; λji≠ 0 and how these may be combined into simple eigenvalue problems. In the course of discussions, we re-examined whether the coupling operators suggested previously are base…