Materials Literature
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The relative optical absorption coefficient $\ensuremath{\alpha}$ of polycrystalline slabs of cuprous oxide was measured at 295\ifmmode^\circ\else\textdegree\fi{}K, 77\ifmmode^\circ\else\textdegree\fi{}K, and 4.2\ifmmode^\circ\else\textdegree\fi{}K. At 4.2\ifmmode^\circ\else\textdegree\fi{}K, $\ensuremath{\alpha}$ is…
The crystal structure of CeCu/sub 2/ was determined. A Ce-Cu alloy containing 66 at.% copper was melted in vacuum at 1081 deg C in a MgO crucible and slowly cooled. Crystals from this ingot were sealed in thin Pyrex tubes and examined with a precision camera. The crystals were found to be onthorhombic, space group Imm…
The structural nature of the spontaneous polarization of NaNO/sub 2/ below its transition point was investigated by neutron diffraction. A set of (Okl) single crystal data was collected at room temperature. The positional coordinates and their standard deviations were compared with those of Truter and Carpenter. The s…
Glycine has three polymorphs, among them the 7-form crystallizes in the hexagonal space group /)31 or P32 with unit-cell dimensions a -7.037, c = 5.483/~. Its crystal structure has been determined by two-dimensional Fourier and three-dimensional least-squares methods. The dimensions of the molecule are close to those…
The author have investigated on wetting characteristics of galena produced from Japan by means of spheroidal drop method. Advancing contact angles were affected with roughness and chemical composition of samples. A formation of new crystal on the surface of depressed galena was determined by electron diffraction metho…
Abstract Microscopic study of Corallinaceae algae previously described from the Thanetian (lower Eocene) of the Pyrenees shows that 34 of the species belong to existing species, and only 21 are actually new species. Although these algae are quantitatively important in the region, the generally poor state of preservati…
The release of the fission gases, xenon and krypton, from molten irradiated uranium was studied experimentally at total initial gas contents of 0.002–138 parts per million. At concentration levels anticipated in spent EBR-II fuels, over 99% of the xenon and krypton is expected to be removed from the molten metal.
Melt refining experiments in which irradiated uranium or synthetic EBR-II alloys were melted in oxide crucibles have shown that removal of zirconium as an oxide does not occur at temperatures up to 1400°C. Removal of zirconium by carbon scavenging of the melt was approximately 50% in 5-hr melts at 1400°C; the mechanis…
Observations of changes in crimp of wool fibers during supercontraction in aqueous solutions have led to a means of modifying the crimp of fibers from a single fleece. Felting studies on such modified fibers have shown that straightening of the wool facilitates felting whereas the imposition of tight coils in the fibe…
Abstract The secondary electron emission from the non-activated and activated surfaces of copperberyllium (4%) by the impacts of various noble gas and hydrocarbon ions was studied together with the determination of the surface structure by the electron diffraction analysis. The main results obtained are as follows. (1…
Materials capable of trapping alkali metal vapors at temperatures up to 800°C were tested and a number of surface-active mterials proved efficient. A sufficient quantity of Molecular Sieves, activated alumina or activated carbon can be contained in a crucible cover to trap and hold the evolved alkali metal vapors from…
Experimental results from a low-temperature test program on magnesium alloys are reported. The new data include: (1) tensile properties of cast AZ91C-T6, AZ92A-T6, EZ33A-T5, HK31A-T6, QE22A-T6, and ZH62A-T5 alloys at −320, −109, 75, 200, and 300 F; (2) notched and unnotched Charpy impact strength of these same alloys…
Ruthenium, molybdenum, palladium, rhodium, technetium, and antimony are retained by the bulk metal when uranium containing macrolevels of accompanying fission elements is melt-refined in oxide crucibles at 1200–1400°C. Under similar conditions, cadmium and tellurium are nearly quantitatively removed, the latter elemen…
The crystal structure of antlerite has been worked out by means of the heavy atom method through the two-dimensional Patterson and Fourier syntheses. The lattice constants of the mineral are a0=8.23±0.02Å., b0=12.00±0.02Å. and c0=6.03±0.01Å. Its space group is Pnam, and there are four chemical units of composition Cu3…
Conventional nickel cadmium cells contain the active materials in either porous sintered nickel plaques or in nickel or nickel‐plated steel pockets or tubes. A new process, adaptable to continuous methods of production, has been developed in which the active and conductive materials are dispersed in a microporous plas…
The gyromagnetic ratios of two different ferromagnetic alloys of manganese were measured by Einstein-deHaas experiments. The Heusler alloy ${\mathrm{Cu}}_{2}$MnAl gave a ${g}^{\ensuremath{'}}$ value of 1.993\ifmmode\pm\else\textpm\fi{}0.002. The alloy MnSb gave a ${g}^{\ensuremath{'}}$ value of 1.978\ifmmode\pm\else\t…
Luna County mines have produced $8.64 million in minerals since the first recorded mining operations in 1876. The bulk of this production has been from lead-zinc-silver ores, but appreciable amounts of manganese, fluorspar, copper, and gold also have been mined. The principal producing districts of the past were the C…
The molecular weights and molecular weight distribution of a styrene–butadiene rubber produced at 5°C. according to an incrementally modified recipe with tert-dodecyl mercaptan modifier, do not differ significantly from those of similar conventionally modified rubbers. The limiting effect of diffusion upon the mass tr…
An investigation has been made of the electrical and mechanical characteristics of the insulation of samples of cables in the range of 60-230 kV after many years of operation in order to evaluate the influence of ageing on the dielectric of oil-filled cables. To determine the effect of thermal ageing alone and in comb…
C 30 QJ u without cracking (reference 1, p. 135). It is known that, up to a certain point, increasing the average molecular weight of a polymer will increase the strength of the filnls and give them greater ability to elongate. Therefore, the characterization of polymers through some measurement that indicates the ave…