Materials Literature
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The bremsstrahlung matrix element at the short-wavelength limit of the spectrum is calculated to lowest order in $\ensuremath{\alpha}\ensuremath{\equiv}\frac{Z}{137}$, for an unscreened Coulomb field. The result, valid for relativistic incoming electrons, is shown to be exactly ${\ensuremath{\alpha}}^{\ensuremath{-}1}…
Summary Yoderite occurs as a major constituent in a quartz-kyanite-tale schist, and is a high-pressure phase formed by the reaction Ky + Tc → Yd + Qu. The monoclinic unit-cell, a 8·10 Å., b 5·78 Å., c 7·28 Å., β 106°, space-group P 2 1 or P 2 1 m , contains approximately (Mg 2·0 Ca 0·2 Fe 0·5 Al 5·3 Si 4·0 O 17·6 (OH)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic Carbonates. IV.1a,b,c Factors Affecting Formation of Homologous Cyclic CarbonatesSHALOM SAREL, LEO A. POHORYLES, and RAPHAEL BEN-SHOSHANCite this: J. Org. Chem. 1959, 24, 12, 1873–1878Publication Date (Print):December 1, 1959Publication History Published online1 May…
During the growth of coherent precipitates stresses are generated because the lattice dimensions of the precipitate differ from those of the matrix. Whon the strain energy is large enough it will be relieved by the precipitate losing continuity with the matrix, i.e. becoming non-coherent. It is suggested that this wil…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Study of the Zirconium-Hydrogen and Zirconium-Hydrogen–Uranium Systems between 600 and 800°Lee D. LaGrange, L. J. Dykstra, John M. Dixon, and Ulrich MertenCite this: J. Phys. Chem. 1959, 63, 12, 2035–2041Publication Date (Print):December 1, 1959Publication History Publishe…
Carbon steel and stainless steel equipment exposed to gas mixtures rich in hydrogen and carbon-monoxide at temperatures from 800 to 1200 F have been attacked with resulting loss of metal. Conditions under which this attack has been observed in a coal-to-oil synthesis plant and the nature of metal deterioration are des…
Following a major shortage of 99Mo in the 2009–2010 period, concern grew that the aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as the target material. The Organisation for Economic Co-...Read More
Abstract The effect of various addends on the specific viscosity of dilute aqueous unionized poly(methacrylic acid) (PMA) solutions, unionized poly(acrylic acid) (PAA) solutions, and poly(acrylic acmide) (PAAm) solutions was investigated. The addition of sodium and lithium chloride decreases the specific viscosity of…
Abstract Theoretical treatment had shown that syndiotactic propagation should be slightly favored energetically over isotactic propagation in free radical vinyl chloride polymerization. This prediction has been confirmed experimentally by x‐ray and infrared investigations of vinyl chloride polymers prepared at various…
A systematic survey of ionization-dissociation processes of fused-ring aromatic compounds is initiated. Mass spectra and appearance potentials of the singly and doubly charged molecule ions are reported. The observed ionization potentials of benzene (9.38 ev), naphthalene (8.26 ev), anthracene (7.55 ev), and phenanthr…
Electron transmission microscope observations have been carried out on copper irradiated with neutrons at temperatures of 35°c and 60°-100°c, and subsequently thinned by electropolishing. Specimens irradiated to a dose of 6.7 × 1017 cm−2 (at 35°c) contain ∼3 × 1016 defects c.c.−1 in the form of small regions of strain…
The variation of the thermal conductivity of uranium-impregnated graphite is measured continuously while under neutron irradiation. The temperature is continuously monitored and results are reported which show the effects of the uranium oxide particle size as well as the effect of the neutron bombardment as separated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe System Ga2O3–SiO2F. P. GlasserCite this: J. Phys. Chem. 1959, 63, 12, 2085–2086Publication Date (Print):December 1, 1959Publication History Published online1 May 2002Published inissue 1 December 1959https://pubs.acs.org/doi/10.1021/j150582a041https://doi.org/10.1021/j150…
Many electron micrographs were obtained for borosilicate glass which had been subjected to chemical attack after heat‐treatment at various temperatures and durations in order to study changes in internal structure, the so‐called “phase separation.” Both replica and direct‐transmission methods were applied to Vycor‐typ…
X-ray powder and rotation patterns of six cubic substances (W, Si, Cr, TiO, Al, and V) using specimens of different thickness were made; the patterns were measured, the lattice constants calculated and plotted against the θ angle or against the Nelson and Riley function. Such curves for thin mounts, semitransparent to…
Abstract The gelation induced by Co 60 gamma radiation in butadiene‐styrene copolymers, homopolymers, and mixtures of these homopolymers was studied by use of random crosslinking theory. The number of crosslinks formed per 100 e.v. of energy absorbed by the polymer, G(X) , was found to be 0.045 for polystyrene and 3.6…
An equation was derived which describes the pressure-time relationship that occurs at the end of a dead-ended or volume-terminated pneumatic transmission line following a sudden pressure change at its input. The two partial differential equations which are solved are basic for transient fluid flow in pipes and analogo…
Experiments and theory are described concerning the rupture of soap films and the continuous formation, by impinging jets, of quasi-stationary liquid sheets.
The rate of oxidation of silicon carbide was measured in an atmosphere of dry oxygen between 900° and 1600°C. The rate was studied by using a thermogravimetric apparatus and was found to be diffusion controlled. The products of oxidation were amorphous silica and cristobalite, depending on the temperature. The effect…
The thermal conductivity of a number of multi‐component systems has been determined as a function of composition and temperature. These were silicate glasses, MgO‐NiO, Al 2 O 3 ‐Cr 2 O 3 , UO 2 ‐UO 2+x ‐ThO 2, ZrO 2 ‐HfO 2 ‐CaO, MgO‐Mg 2 ‐SiO 4 , MgO‐BeO, Al 2 O 3 ‐mullite, MgO‐MgAl 2 O 4 , Al 2 O 3 ‐ZrO 2 , Al 2 O 3…