Materials Literature
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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…
In this paper we have developed a method whereby physical and chemical relaxation processes can be distinguished, using stress relaxation experiments as a function of temperature. We assumed that there exists some temperature range above the glass transition temperature over which the chemical effects can be neglected…
Gas permeability constants of polymers are generally expressed by composite units which contain Numerous combinations of various units to express each component units are used. However, permeability constants of nongaseous substances in polymer membranes are generally expressed by the units of cm2/sec, which are ident…
The magnetoresistance of TTF-TCNQ has been measured for currents along the crystallographic b axis in static fields of 50 kOe for temperatures between 17 and 98 K. For [Formula: see text] the magnetoresistance Δρ/ρ = [ρ(50 kOe) − ρ(0)]/ρ(0) is less than 0.1% in magnitude. There is a peak of about −1.4% at 52.8 ± 0.2 K…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of manganese porphyrins. I. Molecular stereochemistry of chloro-.alpha., .beta., .gamma., .delta.-tetraphenylporphinato(pyridine)manganese(III)John F. Kirner and W. Robert. ScheidtCite this: Inorg. Chem. 1975, 14, 9, 2081–2086Publication Date (Print):Septembe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton nuclear magnetic resonance studies of high-spin manganese(III) complexes with synthetic porphyrinsGerd N. La Mar and F. Ann WalkerCite this: J. Am. Chem. Soc. 1975, 97, 18, 5103–5107Publication Date (Print):September 1, 1975Publication History Published online1 May 20…
Criteria governing the successful application of RE2T17compounds in permanent magnet production are suggested, based upon the experience gained with RECo5materials. The implications of these criteria to both alloy composition and production techniques are illustrated for Sm2(CO1-xFex)17. In this respect the primary ma…
A completely sealed-off electron beam-addressed light valve offering high reliability, low thermal impedance, and low-voltage operation is described. It is suitable for projection displays and is capable of producing bright high-contrast images with full gray-scale range and long-term storage. The light valve is conta…
The vertical section of the Fe-Cr-Co system at 15 wt%Co, 1 wt%Nb and 1 wt%Al was constructed. The extention of the α phase region of the system was sufficient enough to allow for the solution treatment of the alloys at 25∼30 wt%Cr content at any temperature above the α1+α2miscibility gap. After step-tempering, their m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible intramolecular electron transfer in an oxidized nickel porphyrinD. Dolphin, T. Niem, R. H. Felton, and I. FujitaCite this: J. Am. Chem. Soc. 1975, 97, 18, 5288–5290Publication Date (Print):September 1, 1975Publication History Published online1 May 2002Published in…
Lattice parameters of Te${\mathrm{O}}_{2}$ have been measured from 0 to 32.5 kbar by time-of-flight neutron diffraction. Atomic-position parameters have also been measured to 20 kbar for both the low-pressure tetragonal paratellurite phase and the high-pressure orthorhombic phase, which we determined to have a structu…
Magnetic susceptibility, X-ray diffraction and neutron diffraction measurements have been made on quenched and slow-cooled samples of Ni 2 MnAl alloy. Above 300K the susceptibility is Curie-Weiss but on cooling below this temperature the susceptibility becomes field dependent. Neutron diffraction patterns indicate tha…
Electrode surface roughness can cause a large reduction of the threshold for break down in SF6insulated apparatus. This effect is discussed by applying the streamer theory of breakdown to the microscopic field regions associated with surface roughness. A quantitative relation is derived between the practical breakdown…
The oxidation behavior at 1370°C of dense SiC, hot‐pressed with the aid of Al 2 O 3 , has been investigated as a function of Al 2 O 3 content. Increasing amounts of the Al 2 O 3 hot‐pressing aid increased the oxidation rate. Observations of the oxide surface show that a glassy phase (indicating formation of a liquid a…