Materials Literature
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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…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPeroxo complexes of titaniumGerold Schwarzenbach, J. Muehlebach, and Klaus MuellerCite this: Inorg. Chem. 1970, 9, 11, 2381–2390Publication Date (Print):November 1, 1970Publication History Published online1 May 2002Published inissue 1 November 1970https://doi.org/10.1021/ic5…
Abstract Optimum reaction conditions were evaluated for assay of serum ceruloplasmin by measurement of its p-phenylenediamine oxidase activity. The pH optima of p-phenylenediamine oxidase activities of human and rat ceruloplasmins were 5.45 and 5.2, respectively. The p-phenylenediamine oxidase activity of rat cerulopl…
A first-order metal-insulator transition with no change in long-range order occurs in the mixed oxides ${({\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x})}_{2}{\mathrm{O}}_{3}$ with increasing $x (x\ensuremath{\approx}0.01 \mathrm{at} 1 \mathrm{atm}\mathrm{and} 298 ^{\ensuremath{\circ}}\mathrm{K})$ or decreasing pres…
Abstract Under appropriate conditions, both surface areas and cation exchange capacities of clay minerals can be measured by absorption of methylene blue from aqueous solutions. The method has been applied to two kaolinites, one illite, and one montmorillonite, all initially saturated with Na + ions. For Na-montmorill…
The experimental evidence concerning the density of states in amorphous semiconductors and the ranges of energy in which states are localized is reviewed; this includes d.c. and a.c. conductivity, drift mobility and optical absorption. There is evidence that for some chalcogenide semiconductors the model proposed by C…
Abstract Durch reduzierende Methylierung des Octaäthylporphinato‐zinks [ 6a ; (OÄP)Zn] entsteht α.γ‐Dimethyl‐α.γ‐dihydro‐octaäthylporphinato‐zink [ 8a ; (ODMH 2 )Zn]. In Eisessig wird 8a zu (ODMH 2 )H 2 9 entmetalliert, das in diesem Medium Cu 2⊕ ‐ und Ni 2⊕ ‐Ionen unter Bildung von (ODMH 2 )Cu 8b und sehr stabilem (O…
The authors report experimental results in support of probabilistic theory to show that spatial fluctuations of the oxide built-in charge are effectively responsible for surface potential fluctuations, which result in an apparent density of interface states increasing with the mean image charge.
Abstract The relations developed previously for the spinodal and the consolute state in quasi-binary polymer solutions (single solvent and polydisperse polymer) are extended so as to cover quasi-ternary systems containing in addition a second polydisperse polymer. The equations obtained also describe polymer compatibi…