Materials Literature
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A contribution to the magnetic anisotropy of evaporated films by an anisotropic mechanical stress caused by the substrate has been examined. Ni, Co, 85%Ni–Fe alloy with negative magnetostriction and 54%Fe–Co alloy with positive magnetostriction are evaporated onto X -and Z -cut quartz, and glass substrates. An anomalo…
"Random Processes in Nuclear Reactors." Nuclear Science and Engineering, 62(4), pp. 773–774
Acicular single domain particles of γFe2O3, treated with cobalt hydroxide (cobalt-adsorbed type) have more stable magnetic properties than ordinary cobalt-doped particles of γFe2O3. Their small temperature dependence of coercive force and stable uniaxial characteristic are comparable with those of particles of γFe2O3.…
Polybenzimidazoles were prepared in poly(phosphoric acid) from isophthalic acid (I), terephthalic acid (T), and 3,3′-di-aminobenzidine tetrahydrochloride dihydrate (DAB). Homo-polymers of I, T, and various IT copolymers have been prepared. The polymers were characterized by viscosity, IR spectra, and nitrogen estimati…
The objective of this research was to determine if a relationship could be found between dielectric strength and other properties of electrical insulating materials on an empirical basis by using variables predicted by basic theory.
The atomic scattering factors of aluminium have been measured at 80 K using powder samples. The results confirm earlier measurements at room temperature and are in agreement with theory by Ascarelli and Raccah.
A useful method of preparing ferrites has been developed by the coprecipitation of preferred combinations of metal carbonates and hydroxides. These combinations give powders of predictable compositions, low impurity levels and optimum particle sizes and reactivities. Some of the variables which are controlled are pH,…
Abstract Hydroxyl orientation has a major influence on the strength of the ionic interlayer bonding in micas because of the strong repulsion between the hydrogen and the interlayer cation (IC). In order to determine if other factors also influence the magnitude of the interlayer bond energy, the effect due to the vary…
Die ersten Acylisocyanide sind jetzt synthetisiert worden. Die hohe Carbonylaktivierung von Benzoylisocyanid (1) zeigt sich u. a. in der Acylierung von Inaminen; mit Acetylendicarbonsäureester reagiert (1) dagegen unter Cycloaddition. equation image
The method of self-consistent phonons is applied to the melting of the interchain phase locking of linear CDWs. The melting point is obtained as T c =0.11( m * / m ) 1/2 θ t , where m * is the effective mass of the phase mode phonon and θ t is its transverse Debye temperature essentially equal to the phase locking ene…
Methods for measuring residual stresses and distortions in welded structures are described and initial results are given of a survey being carried out during manufacture of warship hull sections. The stresses are determined by measuring the elastic strain induced in the plate and stiffeners due to contraction of the s…
Abstract Neu dargestellt wurden durch Tempern inniger Gemenge von aktiven Oxiden M 2 O 3 bzw. MO 2 und Alkalioxiden AO x (A = Na, K, Rb, Cs) bislang unbekannte kubische Formen von NaScO 2 (a = 4,52 5 Å), NaYO 2 (a = 4,79 1 Å), NaDyO 2 (a = 4,80 0 Å), NaTmO 2 (a = 4,74 3 Å), NaYbO 2 (a = 4,73 0 Å), NaLuO 2 (a = 4,71 5…
Efficient emission has been found in the phosphate phosphors, and under u.v. excitation. For the preparation of these phosphors, an appropriate firing temperature must be selected in regard to the ionic radius of rare earth ions. The luminescence intensity changes little over the wide range of activator concentration,…
Abstract not Available.
Electron diffraction studies of alkali-metal (Li, Na and K) and rare-earth metal (Eu) intercalates of lT-TaS2 reveal the existence of a number of complex super-lattice patterns which are interpreted in terms of a coupled charge density wave and periodic lattice distortion arising from a Kohn anomaly, rather than in te…
A self-avoiding walk on a lattice, confined between two planes, is examined as a model of the stabilization of a colloidal system by adsorbed polymer. If the walk interacts with neither plane, there is a repulsive force on the planes due to the decrease in the volume of configuration space available to the walk. This…
Abstract Two kinds of glassy crystalline phases (I and III) of cyclohexene were realized by different thermal treatments. The heat capacities of the glassy and the supercooled crystal-I and -III, as well as the stable crystalline phases were measured by an adiabatic calorimeter in the temperature range 12–300 K. The g…
Phase relations have been determined for the system Cu-Sb-As-S between 350 degrees C and 500 degrees C. A new compound, Cu 4 (As,Sb) 2 S 5 , the only quaternary phase synthesized in this study, has not yet been reported as a mineral. It is not stable in either the Cu-Sb-S or Cu-As-S ternary system yet is ideally a ter…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew tetrapyrrolic macrocycles. 18 and 20 .pi. Electron homoporphyrinsH. J. Callot and E. SchaefferCite this: J. Org. Chem. 1977, 42, 9, 1567–1570Publication Date (Print):April 1, 1977Publication History Published online1 May 2002Published inissue 1 April 1977https://pubs.acs…
Raman spectra of oriented single crystals of KNO 3 (II) have been recorded at 298 and 77 K. At both temperatures the data are in excellent agreement with the factor group analysis based on the generally accepted Pmcn space group. Additional spectral features observed near room temperature suggest the presence of a sig…