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A spherical Luneberg lens has the property of focusing the rays from a point source on the surface of the lens into a collimated beam on the diametrically opposite side of the lens. In microwave applications a point source on the surface of the lens is usually not obtained. Curves are given for the required index of r…
The maximum bubble pressure method for the determination of surface tension has been modified for use with thermally unstable, viscous, opaque polymers at high temperatures. A value of 35.1 dynes/cm. was obtained for nylon 66 at 285°C. The order of this value and those for other polymers has been compared with the val…
The kinetics of the formation of the iron‐tin alloy have been studied at temperatures below and above the melting point of tin (232°C). At all temperatures studied, the growth obeyed the parabolic‐rate law. This is indicative of a diffusion mechanism. An Arrhenius plot of the data gives a straight line below the melti…
Abstract not Available.
The hydrogen pickup during corrosion in high‐temperature water and steam of various binary and ternary alloys of zirconium with iron and tin has been studied. The total hydrogen content of specimens exposed to 400°C steam was found to be greater than that of specimens exposed to 360°C water. Furthermore, the per cent…
Abstract Messungen bei 20 °C an Legierungen zwischen 100% Fe und 75% Fe. 25% Ni ergaben im magnetisierungsabhängigen Teil der Hall‐Feldkurven und auch oberhalb der Sättigung positive Hall‐Konstanten. Sowohl R 1 als auch R 0 werden durch Zusatz von Nickel zu Eisen vergrößert. Bei dem Übergang von den raumzentrierten zu…
Abstract Copolyamides with mixtures of adipic and terephthalic acids in various mole rations and three types of diamine were prepared, and a melting point vs. composition curve for each system was constructed. The three types of diamine were: (1) straight‐chain aliphatic diamines with six to twelve carbon atoms, (2) m…
The temperature and strain rate-dependence of the flow stress of magnesium single crystals was measured in the temperature range 1� 45-248 oK. Some incidental observations were also made on the form of the stress-strain curves and the appearance of Blip lines. The deformation characteristics show close similarity with…
By constructing a simplified physical model, the geometrical relationships that exist in an unfinished 2-bar warp-knitted fabric are determined. Hence, a method for calculating the run-in from the course–wale spacing of a fabric in the loom state and the denier of the yarn is deduced. It is further shown how to calcul…
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Accessory clay-size minerals occur as disseminated particles and as fillings of pockets and fissures in the Lake Superior iron ores, the oxidized iron-formation, and the associated altered dikes. Dickite and kaolinite are the most abundant clay minerals in the Marquette, Gogebic, and Iron River districts of Michigan a…
Knowledge of the genus Haematococcus is briefly summarized, the existence in Southern Africa of many habitats suitable to the alga indicated, and the occurrence of the various species recorded. The cosmopolitan species H. lacurtris is widespread. In addition two new species are described: H. capensis with several vari…
The solubility of hydrogen in zirconium was determined as a function of temperature (range: 500° to 900°C) and pressure (range: 10−3 to 30 mmHg). The diffusion coefficients for H in α-Zr (range: 450° to 700°C) and in β-Zr (range: 870° to 1100°C) were calculated by diffusion-annealing method, which consisted of anneali…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation S. S. Flaschen, A. David Pearson, William R. Northover; Low Melting Sulfide‐Halogen Inorganic Gla…
Pure Ni‐Cr alloys containing up to 29% Cr and Co‐Cr alloys containing up to 23% Cr were prepared in vacuum. Corrosion rates in sulfuric and nitric acids, corrosion potentials, and critical current densities for passivity were determined at 25°C. It is concluded that specific alloying proportions of passive composition…
The negative difference effect in the case of steel can be explained in terms of corrosion by removal of blocks or "chunks" of metal containing perhaps only a few atoms. The "chunk effect" also explains the observed fact that, under conditions of high corrosion rate, minimum protective current can be much less than th…
Evidence is presented to show that the load drops observed in most metals at very low temperatures arise from thermal instability rather than mechanical instability of the lattice. Measurements of the temperature rise are described.
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An improved method is presented for determining those three molecular field coefficients which yield essentially the best agreement between the Néel theory and the experimental curve of saturation moment per unit mass (σ) versus temperature (T) in a given ferrimagnetic material. This method is analytical, and for a gi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPREPARATION AND STRUCTURE DETERMINATION OF SOME NEW CUBIC AND TETRAGONALLY-DISTORTED PEROV-SKITESLothar H. BrixnerCite this: J. Phys. Chem. 1960, 64, 1, 165–166Publication Date (Print):January 1, 1960Publication History Published online1 May 2002Published inissue 1 January 1…