Materials Literature
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Measurements have been made of the variations with temperature of the intensities of x-ray diffraction lines from silver and iron. For silver the measurements were in the range 286–1100°K, and the Debye-Waller temperature factor corresponded to a characteristic temperature of 197°K at 286°K. For iron the measurements…
The univariant equilibrium pressure‐temperature curve along which β‐MnO 2 , Mn 2 O 3 , and O 2 are stable together has been determined up to a Po 2 of 200 atmospheres with a trace of water as a catalyst. The analogous curve for the assemblage Mn 2 O 3 , Mn 3 O 4 , and O 2 has also been determined. In both cases the ex…
Studies of dislocations in elongated aluminum crystals by diffraction electron microscopy revealed narrow dislocation loops lying parallel to 〈112〉. These loops formed only behind screw dislocations, their long parts then having edge character. Four mechanisms have been proposed to account for the formation and stabil…
Infrared absorption spectra have been obtained in the 430 to 4000 cm—1 region for B3O3(OH)3, B310O3(OH)3, and B3O3(OD)3, as polycrystalline mulls and, in the case of B3O3(OH)3, as a single crystal section. A partial Raman spectrum has been obtained for B3O3(OH)3 in the polycrystalline form. The spectral data have been…
Abstract Poly(ethylene terephthalate) prepared or fabricated by melt processes is shown to contain about 1.5% of extractable, oligomeric material composed mainly of cyclic ethylene terephthalates which exist, at high temperatures, in equilibrium with the molten polymer. An ester interchange‐elimination reaction is pro…
Dislocations having a Burgers vector in the basal plane and lying in this plane, have been studied in graphite by the use of thin foil transmission electron microscopy. The dislocations are dissociated into ribbons consisting of two partials separated by a stacking fault. Specific models for these dislocations are pre…
Studies were made of the climb of dislocations in silicon crystals induced by the diffusion of gold in the temperature range from 1000°C to 1300°C. For some studies, dislocations were introduced into previously dislocation-free crystals by indentation at room temperature and deformation at about 900°C in order to pred…
The basic requirements of a garment in use and basic techniques in garment manufacture are briefly discussed. The relevant mechanical properties, of buckling, compression in the plane of the fabric and shearing are described and methods of measurement are indicated. It is argued that there are upper and lower limits t…
The method of Luttinger and Tisza for finding the rigorous minimum of a quadratic form subject to certain strong constraints is generalized. In the extended method, one still minimizes the quadratic form with respect to a single weak constraint, which however now contains adjustable parameters. In determining the grou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT7,7,8,8-TETRACYANOQUINODIMETHANE AND ITS ELECTRICALLY CONDUCTING ANION-RADICAL DERIVATIVESD. S. Acker, R. J. Harder, W. R. Hertler, W. Mahler, L. R. Melby, R. E. Benson, and W. E. MochelCite this: J. Am. Chem. Soc. 1960, 82, 24, 6408–6409Publication Date (Print):December 1,…
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Abstract A description is given of the ultra-structure of the eye of Drosophila melanogaster during its development from the imaginal bud of the late larva till it attains its final form in the adult. Six markedly different types of cells develop out of the apparently uniform epithelium of the imaginal bud; namely, co…
The fluorescence emission and excitation, reflection, and transmission spectra of 22 different NaI crystal samples grown in crucibles of Pt or quartz under atmospheres of ${\mathrm{N}}_{2}$ or ${\mathrm{H}}_{2}$ or ${\mathrm{H}}_{2}$ plus ${\mathrm{I}}_{2}$ and in some cases containing stoichiometric excess of Na or $…