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Room‐temperature optical absorption spectra, electron spin resonance spectra at 15° to 18°K, electrical conductivity, and emf measurements on concentration cells at 1620°C are analyzed and used to determine the defect structure of Codoped α‐Al 2 O 3 . The crystals are mixed ionic and electronic conductors at 1620°C: i…
When the network system is limited, most ferroelectric glass‐ceramics will produce a fully crystallized transparent body when cerammed at low temperatures. Higher‐temperature heat treatment results in crystal growth and gradual loss of transparency. In the transparent state, the crystal size is limited to ∼2000 Å. Pie…
Microscopic details of physical changes occurring in steel plates impacted at hypervelocities by spherical projectiles of several materials are studied by means of metallographic examinations of polished and etched target cross sections. A hemispherical volume of material beneath the impact site undergoes the pressure…
Abstract We have shown in this and the preceding paper that fully compounded stocks can be analyzed for all main constituents by use of a combination of DSC, TG, and DTG. Further, this can be achieved on a time scale consistent with routine quality control. DSC gives information on cure characteristics, sulfur, and ac…
Abstract Phosphate adsorption by several Hawaiian and Indian soils, and the relation of phosphate adsorption to hydroxyl, sulfate, and silicate ions released in two Hawaiian soils were studied. Adsorption isotherms of some of the soils show an abrupt increase in phosphate adsorption at high concentrations. The isother…
Abstract The crystal structure of the title compound has been determined from three-dimensional X-ray data collected on Weissenberg photographs, using CuKα radiation. The intensities were estimated visually with a standard scale. The structure was solved by the heavy-atom method and refined by the least-squares method…
Abstract Contributions to the structural strength of meat samples by the myofibrillar and connective tissue components were altered by varying the myofibrillar contraction state, muscle type and the cooking temperature. Shear, tensile and adhesion measurements were used to evaluate quantitatively changes in the proper…
We report magnetic and x-ray diffraction studies on a single crystal of [N(n-Bu)4]2[Cu(mnt)2], where mnt = maleonitriledithiolato (C4N2S2)−2. The planar paramagnetic (S=1/2) [Cu(mnt)2]−2 anions crystallize in stacks with crystallographically equivalent sites, and the stacks are isolated by the cations. The compound cr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of extraplanar ligands on the redox properties and the site of oxidation in iron, ruthenium, and osmium porphyrin complexesGilbert M. Brown, Frederick R. Hopf, Thomas J. Meyer, and D. G. WhittenCite this: J. Am. Chem. Soc. 1975, 97, 19, 5385–5390Publication Date (Prin…
Corrosion products of amalgam produced in Ringer's solution were compared with products formed in vivo using scanning electron microscopy, X-ray microanalysis, and potentiostatic anodic polarization. The corrosion products in an old amalgam were probably a mixture of tin-oxide and tin oxychloride. In vitro corrosion o…
We have measured the magnetomechanical coupling in highly magnetostrictive TbxDy1-xFe2-δas a function of bias field, x, and δ. We find a peak coupling factor of 0.6 at x = .26 and bias field of 180 Oe; the largest reported for a magnetostrictive material. The corresponding material Q is 200. Because of the high magnet…
A friction-testing instrument has been designed for attachment to the Instron tensile tester. It provides for dual, synchronized measurements of the friction and contact forces between fibers of yarns sliding over each other. The instrument consists of a micrometer, pressure jaws, and an electrical force transducer to…
Auger electron spectroscopic techniques were used to monitor the surface composition of a beryllium–copper alloy upon heating and oxidation to determine the surface composition necessary for maximum secondary-electron yield. A 500–1000 Å BeO layer on the surface was found to give rise to the maximum secondary-electron…
In this paper we investigate the influence of hydrostatic pressure (up to 1000 bar) on the magnetization mechanisms of spinel polycrystalline ferrites. The results presented here have been obtained on the composition Ni.36Zn.64Fe2O4. We show that : - the inverse of the initial susceptibility increases linearly with th…
Numerical methods are generally applied to induction devices by assuming 2-dimensional geometry, and are difficult to extend to 3 dimensional eddy currents because the field relationships require vector functions, each with 3 interdependent components. A simpler description is sought by replacing the field quantities…
Abstract The pattern of pads, the morphology and microscopical anatomy of the papillae, the structure of dermis, and the attachment of the skin to the skeletal elements were studied in species representing Passeriformes, Psittaciformes, and Strigiformes. Functional observations were made while dissecting fresh materia…
The paper deals with different aspects of insulator contamination in the desert, based on extensive laboratory tests and field experience with 500 kV transmission line insulators. It is shown that the build-up of the contamination layer in the desert is a gradual and slow process. Light sand particles are shown to be…
This communication describes a new method of manufacturing tungsten microelectrodes with finer tip size and more reproducible exposed recording area than has been previously achieved. The tips are dc electroetched to diameters below 500 A and completely covered with polymethyl methacrylate. An electron beam from a sca…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew evidence in the mechanism of ozonolysis of olefinsG. Klopman and C. M. JoinerCite this: J. Am. Chem. Soc. 1975, 97, 18, 5287–5288Publication Date (Print):September 1, 1975Publication History Published online1 May 2002Published inissue 1 September 1975https://pubs.acs.org…
Relative elastic differential cross sections for electrons scattered from C2H6, C2H4, and C2H2 have been measured for angles between 3 and 130 deg and electron energies between 100 and 1000 eV. The data agree very well, for angles larger than 40 deg, with calculations in the independent atom model approximation and pa…