Materials Literature
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Yavapaiite [KFe(SO+):l crystallizes in space group C2/m with two formula weights in a unit cell of dimensions a:8.152, b:5.153, c:7.877 A, B:O+.Of . The structure was solved by a three-dimensional Patterson synthesis and refined by the frill-matrix leastsquares method to R:3.27o. Goldichite [KFe(SOr)z.4HzO] in space g…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransition probabilities of europium in phosphate glassesR. Reisfeld, R. A. Velapoldi, L. Boehm, and M. Ish-ShalomCite this: J. Phys. Chem. 1971, 75, 26, 3980–3983Publication Date (Print):December 1, 1971Publication History Published online1 May 2002Published inissue 1 Decem…
A computer model was used to calculate the shape and average velocity v of a dislocation acted on by a viscous drag, and moving through a field of point obstacles. As a special case, the operation of a Frank-Read source was computed also. At sufficiently low velocities (and stress levels), the behavior is governed ent…
Immediate longitudinal detonations have been observed in confined small-diameter columns of PETN, RDX, and tetryl by using a focused Q-switched ruby laser. The energy ranged from 0.8 to 4.0 J in a pulse width of 25 nsec. A 1000-Å-thick aluminum film deposited on a glass window was used to generate a shock wave at the…
Abstract The effect of an aqueous environment on the tensile properties of Kapton polyimide film has been investigated. Immersion of specimens in distilled water at 25° to 100°C for time periods ranging from one hour to several hundred hours resulted in a decrease in the ultimate tensile strength of the polymer from 2…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of schizokinen, An iron-transport compound from Bacillus megateriumKary B. Mullis, J. R. Pollack, and J. B. NeilandsCite this: Biochemistry 1971, 10, 26, 4894–4898Publication Date (Print):December 1, 1971Publication History Published online1 May 2002Published iniss…
Abstract A scanning and high voltage electron microscope study of the fabric of laboratory sedimented moist uncompressed kaolinite and illite floccules reveals an abundance of face-face flake orientation in the porous clay network. Clays were flocculated in the laboratory in both distilled water and slightly saline (1…
The weak beam technique is used to obtain a value for the stacking-fault energy of copper. The observed partial dislocation image spacings are compared with many-beam computational models and it is demonstrated that anisotropic elasticity theory breaks down for small partial dislocation spacings in copper.
One of the modes of electromigration damage is shown to be related to irregularities in the grain-boundary structure of films. Based on the restriction of electromigration to grain boundaries, calculations are performed to determine the magnitude and distribution of excess vacancy concentrations at sites where electro…
A heritable connective tissue disorder of cattle, dermatosparaxis, is characterized by an extreme fragility of the skin and the presence of additional peptides at the N-terminal extremities of the collagen alpha chains, p-alpha(1) and p-alpha(2). The existence of an enzyme activity is demonstrated in normal connective…
Using standard imaging techniques of electron microscopy it is not possible to resolve the partial dislocations having the equilibrium separation for dissociated dislocations in the pure face-centred cubic metals. Consequently the stacking-fault energy γ cannot be determined from direct measurements of the separations…
The hopping conduction process is examined under conditions of high temperatures, high fields and a non-uniform distribution of hopping sites. It is shown that the field dependence of the Mott T −¼ law can yield information about the trap density distribution. A new mechanism of conduction, considering the emission of…
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Samples of the cobalt-zinc ferrite series ${\mathrm{Co}}_{1\ensuremath{-}x}{\mathrm{Zn}}_{x}{\mathrm{Fe}}_{2}{\mathrm{O}}_{4}$ have been studied by the M\"ossbauer-effect technique at 4 \ifmmode^\circ\else\textdegree\fi{}K, in magnetic fields from 0 to 80 kOe, covering the full range of zinc content. The cation distri…