Materials Literature
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The genetic location of mutations affecting the citric acid cycle and the properties of mutants of Bacillus subtilis possessing these mutations have been examined. Genes coding for the component enzymes of the cycle were found to be unlinked to each other and thus do not form an operon. The mutational defect in a muta…
Relative displacements of the atoms corresponding to the lowest frequency long wavelength transverse optic phonon of several materials with the perovskite structure were determined directly by a least-squares refinement of the integrated intensity of inelastic neutron scattering. The modes of KTaO3 and SrTiO3 were ide…
LCR
This study investigated the effect of alloying on the behavior of Fe-Cr-Ni base alloys in boiling MgCl2 solutions. Alloys included commercial Fe-Cr-Ni alloys; ternary Fe-Cr-Ni alloys to 40% Cr; fourth-component alloys with specific alloy bases; fourth-, fifth-, and sixth-component alloys. The primary experimental meas…
We have developed a fast and essentially exact numerical technique for computing propagation, reflection and transmission of light by a flat layer of any linear optical medium in which the dielectric tensor varies only in a direction normal to the surfaces. Using this technique with Oseen's spiraling-dielectric-tensor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinding energy of the "2p" electrons of silicon in various compoundsRagnar Nordberg, Heinz Brecht, Royal G. Albridge, Anders Fahlman, and John R. Van WazerCite this: Inorg. Chem. 1970, 9, 11, 2469–2474Publication Date (Print):November 1, 1970Publication History Published onl…
The electrical conductivity and thermoelectric power of highpurity polycrystalline ThO 2 in thermodynamic equilibrium with the gas phase were measured as a function of temperature from 1000° to 1600°C and as a function of oxygen partial pressure from 1 to 10 −22 atm. An n ‐type electronic contribution to the conductiv…
The lattice dynamics of tetragonal BaTi${\mathrm{O}}_{3}$ have been investigated by inelastic neutron scattering from a single-domain crystal. Measurements were carried out on two projections, ($\mathrm{hk}0$) and ($h0l$); the study revealed extreme anisotropy in energy and damping of the soft optic mode, depending up…
A general theory is developed for the relation between the molecular length and the position of a diffraction maximum found at diffraction angles of the order of 4°, for nematic and isotropic phases containing elongated molecules. Using this theory and a previously developed one for the relation between the intermolec…
Sound velocities, densities, and lattice parameters of hot‐pressed bodies of the solid‐solution series Al 2 O 3 −Cr 2 O 3 were investigated. Measured lattice parameters deviated slightly from Vegard's law. The compositional dependence of the longitudinal sound velocity agreed well with the predictions of Birch; the ob…
This paper presents results of experimental studies on the flashover strength of ice-coated insulators. Two types of flashover have been found on ice-covered insulators. One is caused by hard and dry ice formed in temperatures lower than 15 °F. Another is caused by mixed conditions of ice and misty rain in relatively…
Abstract The effects of defocussing and spherical aberration in the electron microscope image are most simply and directly displayed in the Fourier transform of the image. We have investigated the process of image formation by determining the changes in the transform of the image of thin crystals of catalase, which ha…
Color-center transformations in pure and dosimetry grade LiF have been studied over the wavelength range 105–750 nm. Both impurity- and irradiation-induced optical absorption were measured, the latter by a relatively high x-ray exposure at room temperature. Thermal and optical treatments were chosen to induce transfor…
Solid solutions $\mathrm{Fe}\mathrm{Sn}$ and the compounds ${\mathrm{Fe}}_{3}$Sn, ${\mathrm{Fe}}_{5}$${\mathrm{Sn}}_{3}$, ${\mathrm{Fe}}_{3}$${\mathrm{Sn}}_{2}$, FeSn, and Fe${\mathrm{Sn}}_{2}$ have been studied by the M\"ossabauer effect in both Fe and Sn nuclei. Also, standard x-ray diffraction and magnetization stu…
The metal-insulator (M-I) transition in Cr-doped ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$, which has been shown to be a Mott transition, was investigated by following the resistance as a function of pressure at temperatures above 298 \ifmmode^\circ\else\textdegree\fi{}K. This study has shown that the M-I phase boundary te…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical Properties of Poly(β-hydroxy butyrate). II. Conformational Aspects in SolutionR. H. Marchessault, Keizo Okamura, and C. J. SuCite this: Macromolecules 1970, 3, 6, 735–740Publication Date (Print):November 1, 1970Publication History Published online1 May 2002Published…
We have extended the theoretical work of Harvey et al. [J. Cellular Comp. Physiol. 24, 1–22 (1944)] and Strasberg [J. Acoust. Soc. Amer. 31, 163–176 (1959)] in order to consider the conditions that must exist in a liquid for a vapor cavity to be nucleated from an imperfectly wetted solid impurity (mote) in the liquid.…
The thickness dependence of resistivity and its temperature coefficient of thin metal films has been studied. A theory is proposed to include, the surface roughness in determining the film resistivity, in addition to the reduced mean free path to conduction electrons. The ratio of the roughness to the mean free path,…
Absorption corrections for cylindrical and spherical crystals have been evaluated by numerical integration for values of μR in the range 0 to 1.0, where μ is the mean linear absorption coefficient and R is the radius of the crystal. For this range of μR, which is that normally required for neutron diffraction data, in…
At \ensuremath{\sim} 155 \ifmmode^\circ\else\textdegree\fi{}K, the metallic corundum structure of ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ distorts to an insulating monoclinic one. Structural refinements of this low-temperature phase by x-ray diffraction techniques show an increase in the nearest-neighbor vanadium --- van…