Materials Literature
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The thermal conductivities of single crystals of silicon and of calcium fluoride have been measured in the temperature range 3-40 \ifmmode^\circ\else\textdegree\fi{}K and 2.5-30 \ifmmode^\circ\else\textdegree\fi{}K, respectively. For samples in the form of square cross-section rods, the conductivity in the boundary sc…
The following two equations are proposed for the temperature dependence of the elastic stiffness constants: ${c}_{\mathrm{ij}}={c}_{\mathrm{ij}}^{0}\ensuremath{-}\frac{s}{({e}^{\frac{t}{T}}\ensuremath{-}1)}$ and ${c}_{\mathrm{ij}}=a\ensuremath{-}\frac{b{T}^{2}}{(T+c)}$, where ${c}_{\mathrm{ij}}^{0}$, $s$, $t$, $a$, $b…
Abstract Photoelectron spectra of the halides of B, C, N, P, As, S, Se, Te and U are reported and interpreted in terms of molecular orbital structure. The experimental criteria which are used to identify the orbitals are briefly discussed. It is shown how the orbitals of the halides of the elements of different groups…
The negative magnetoresistance in ${\mathrm{Fe}}_{3}$${\mathrm{O}}_{4}$ crystals at 77\ifmmode^\circ\else\textdegree\fi{}K was found to saturate at about 9 kG and to increase with increasing electric field. The magnetoresistance data are explained in terms of spin disorder scattering. In the presence of a magnetic fie…
The absorption of SrTi${\mathrm{O}}_{3}$ below the fundamental edge shows, near liquid-nitrogen temperature, an oscillatory behavior, for which an explanation is proposed in terms of indirect transitions ${\ensuremath{\Gamma}}_{15}\ensuremath{\rightarrow}{X}_{3}$, centered around 3.27 eV and involving a 51-meV LO phon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModified Ney-Armistead Cell for Gas Diffusion MeasurementsArvo Lannus and E. D. GrossmannCite this: Ind. Eng. Chem. Fundamen. 1970, 9, 4, 655–657Publication Date (Print):November 1, 1970Publication History Published online1 May 2002Published inissue 1 November 1970https://do…
Creep-rupture properties for C-129Y (Nb–10% W–10% Hf–0.1% Y) to 1000 h are presented at 980°, 1095°, and 1205°C. Improvements in strength at 980° and 1205°C can be achieved by pretest annealing at higher temperatures. These improvements are achieved only at the expense of a significant loss in ductility.
Lattice dynamics has progressed a long way since Born and Huang's book was originally published in 1954.A paperback version, scarcely differing from the first edition, is now available.Though there is no discussion of neutron and X-ray scattering, and though the experimental information on elastic, thermodynamic and o…
Abstract The time optimal control problem for jacket cooled continuous flow stirred tank reactor (CSTR) with an exothermic, irreversible, second‐order, homogeneous, liquid‐phase reaction (the saponification of ethyl acetate) was solved with the maximum principle and phase plane analysis. Both experimental studies and…
Abstract Anhand von mehr als 100 Literaturhinweisen zeichnet der Verfasser die Entwicklungen seit der Aufstellung der Tammannschen Zunderformel im Jahre 1920. In diesem Zusammenhang werden die reaktionsbestimmenden Vorgänge erörtert, die den Ablauf der Reaktion nach einem parabolischen Zeitgesetz bedingen, so z. B. Di…
Abstract The differential and integral cross sections for the elastic and inelastic scattering of electrons by atoms are discussed. The differential scattering cross section describes the angular distribution of the scattered electrons while the integral cross section is a measure of the fraction of the incoming elect…
Utilization of normal and isoparaffins, separately and in mixtures, by a Trichosporon sp. was investigated. From a mixture of normal paraffins and isoparaffins, the organism consumed straight-chain paraffins, leaving the branched paraffins relatively unchanged. When offered separately, the highest utilization of n-alk…
Theory of Electromagnetic Properties of Supercon- ducting and Normal Systems.I. Sang Boo Nam [Phys.Rev. 156, 4VO (196V)].The lower limit of the first integral in Eq. (4.35b) should be ru~- ĩnstead of [&o -&u, -to ].The statement below Eq.(4. 35b) "Here [co~-ru, -&o~] denotes that the alge- braically largest of two num…
We have examined theoretically and experimentally triplet–triplet energy transfer for several different donor–acceptor pairs dissolved in low-temperature glasses in order to determine if there is some observable preferred mutual orientation for energy transfer, especially at large intermolecular distances. In particul…
The double decomposition of hafnium and titanium tetrakis tertiary amyloxides was used to produce high‐purity stoichiometric submicron HfTiO 4 powders. The particle size range was 50 to 400 Å. X‐ray diffraction of a 1:1 mixture, as‐prepared and heated to ∼750°C, indicated that the material is 95% orthorhombic HfTiO 4…
The preparation, microstructure, and properties of BaZrS 3 ceramics are described. The compound was prepared by heating either an equimolar mixture of BaS and ZrS 2 or BaZrO 3 alone in CS 2 gas. The reaction of the BaZrO 3 −CS 2 system was extremely rapid, as would be expected in an autocatalytic reaction caused by ve…
Epitaxial AlAs was grown on GaAs substrates, and polycrystalline AlAs films were deposited on quartz. The visible optical absorption edge indicated that the direct band gap was 3.5 eV while the indirect gap was 2.2 eV. Infrared interference fringes were measured and the high-frequency dielectric constant was determine…
Abstract Energy loss of the electron beam in the specimen affects the electron microscopical resolution, owing to chromatic aberration, and causes radiation damage by ionisation, heating and direct ejection of atoms. Measurements recently made of the energy loss in carbonaceous specimens confirm that the effect on ima…
This paper considers electrical discharge mechanisms as they occur across relatively dry zones on wet contaminated insulator surfaces. A mathematical model was assumed with constant surface resistivity, and constants were evaluated from experimental results obtained using a simple cylindrical geometry with a dry zone,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFurther studies of the thermal decomposition of europium hexacyanoferrate(III) and ammonium europium hexacyanoferrate(II)Patrick K. Gallagher and Betty PrescottCite this: Inorg. Chem. 1970, 9, 11, 2510–2512Publication Date (Print):November 1, 1970Publication History Publishe…