Materials Literature
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The system UC‐UC 2 was investigated at temperatures to 2200°C. utilizing high‐temperature X‐ray diffraction techniques. UC 2 , which has the CaC 2 structure, was shown to transform to the CaF 2 structure at 1820°C. Mean coefficients of expansion of UC, U 2 C 3 , and UC 2 were determined. The decomposition of U 2 C 3 t…
The new variable-groove-depth grating-type interferometer that was used to obtain experimental interferograms and spectra used for short and long wavelengths (λ<15 μ to λ>4 mm), together with its construction and testing, is described.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal Chelate Stability Constants of Aminopolycarboxylate LigandsJ. H. Holloway and C. N. ReilleyCite this: Anal. Chem. 1960, 32, 2, 249–256Publication Date (Print):February 1, 1960Publication History Published online1 May 2002Published inissue 1 February 1960https://pubs.ac…
Abstract In all polymer crystallinity determinations, the basic assumptions are made that there exist only two well‐characterized phases and that the volumes of those phases are additive. For the case of polyethylene, the specific volume of the amorphous phase cannot be measured directly and is usually obtained as a l…
Abstract The following mechanism is postulated for the copolymerization of α‐methylstyrene (or similar 1,1‐disubstituted ethylene), M 2 , at temperatures near its ceiling temperature but far below the ceiling temperature of the comonomer, M 1 . Either M 1 or M 2 may combine with a polymer chain ending in either m or m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Homopolymerization of MonoisocyanatesVictor E. Shashoua, Wilfred Sweeny, and Raymond F. TietzCite this: J. Am. Chem. Soc. 1960, 82, 4, 866–873Publication Date (Print):February 1, 1960Publication History Published online1 May 2002Published inissue 1 February 1960https://d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRadiation Damage in Organic Crystals. I. CH(COOH)2 in Malonic Acid1H. M. McConnell, C. Heller, T. Cole, and R. W. FessendenCite this: J. Am. Chem. Soc. 1960, 82, 4, 766–775Publication Date (Print):February 1, 1960Publication History Published online1 May 2002Published inissu…
SUMMARY: The normally slow rates of growth and of cellulose synthesis by certain strains of Acetobacter in static culture were accelerated greatly when these strains were cultured in shaken, indented flasks or in stirred aerated fermenters, whereby the time factor was reduced from 3–4 weeks to 2–4 days. Optimum yields…
This paper proposes two mathematical models of the plain-knitted loop, both based on the simple elastica, which can be used to describe the dimensional properties of a plain-knitted fabric.
A method has been developed whereby the velocity of motion of fresh dislocations introduced into a crystal by scratching the surface may be measured as a function of stress. The velocities of unpinned edge dislocations in 3¼% silicon-iron have been measured as a function of stress over a range of five orders of magnit…
The existence of sub-microscopic cracks in heavily cold-worked metals has been suggested in explanation of the very large discrepancies in dislocation densities estimated from changes in density and electrical resistivity, and release of stored energy on annealing such materials. It is shown that microcracks will prod…
The magnetic properties of Ni${\mathrm{F}}_{2}$ are studied theoretically with the use of a spin Hamiltonian approach. It is shown that the anisotropy of the susceptibility above the N\'eel temperature indicates a spin arrangement below the N\'eel temperature in which all the spins are perpendicular to the $c$ axis an…
The general formula is derived by considering the model of a single electron moving in a central field. Approximate bound–state radial functions, accurate for large radial distances, may be obtained once the effective quantum numbers |$\nu(=n^\ast)$| are known. Bates and Damgaard have shown that such functions may be…
Construction and calibration of apparatus utilizing a solid pressure medium for phase-equilibrium studies at elevated temperatures and pressures are described. Pressure calibration is carried out by measurement of the Bi I-Bi II and T1 II-T1 III transitions. A new determination of the thallium transition, 37.1±1.3 kil…
Thermal activation energies were computed from various glow peaks of NaCl and KCl single crystals. The method developed in the preceding paper has been used successfully in these calculations. Good agreement was obtained with the results calculated from the initial rise of the glow peaks. Activation energies varied fr…
A self-consistent crystal potential is constructed for cubic BN. Exchange is included according to the Slater free-electron approximation. The effect of the heteropolar character of the potential is included explicitly in an approximately self-consistent treatment of the valence-electron charge density. The energy gap…
The effect of isotopic mass on elastic properties of solids was studied by measuring the elastic modulus of isotopically-concentrated polycrystalline specimens of metallic lithium at 25\ifmmode^\circ\else\textdegree\fi{}C. The elastic modulus of lithium-6 (96.1% ${\mathrm{Li}}^{6}$, 3.9% ${\mathrm{Li}}^{7}$) was found…
The range of 1-10 kev electrons in metals and phosphors has been measured by recording the light output as a function of energy from a sample consisting of a metallic layer deposited on a transparent phosphor layer. The measurements lead to the development of the following range-energy expression: $R=250(\frac{A}{\ens…
A new method for the evaluation of thermal activation energies from glow curves of excited crystals is described. Use is made of the symmetry of the glow peak, from which the activation energy is calculated by a simple formula: $E=(\frac{q}{\ensuremath{\delta}})k{{T}_{g}}^{2}$, where ${T}_{g}$ is the peak temperature,…
In recent years, several reports have been made on the experiments of the cavitation damage. But, for some of them, it is assumed that their cavitation impingements were severer than the real one. In this studies, more natural method (cf. Fig. 1, Photo. 1) was used for the erosion tests of the copper alloys (Sn bronze…