Materials Literature
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Among other hypotheses, the classical theory of high-speed penetration assumes the incompressibility of both the projectile and target. Employing a simple Murnaghan equation of state, we show here that direct compressibility effects (pv-work) on penetration depth are at most on the order of 10–15% for projectile speed…
Abstract In the three previous papers of this series the role played by the exchangeable cations in the adsorption of methanol by homoionic montmorillonites has been investigated by different techniques, namely desorption isotherms, X-ray determination of the basal spacings and IR spectroscopy. In this last paper, mod…
This paper demonstrates the capability to perform three-dimensional computations for explosive-metal interaction problems with complex sliding surfaces. An analysis is performed for an explosive device which accelerates a metal liner known as a self-forging fragment. Results are presented to show the effects of off-ce…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn interstitial hydrogen atom in a hexanuclear metal cluster: x-ray and neutron diffraction analysis of [(Ph3P)2N]+[HCo6(CO)15]-Donald W. Hart, Raymond G. Teller, Chiau-Yu Wei, Robert Bau, Giuliano Longoni, Stefano Campanella, Paolo Chini, and Thomas F. KoetzleCite this: J.…
Abstract not Available.
Magnetic susceptibility, electrical resistivity, Mössbauer effect (ME) and transmission electron microscopy measurements in single crystals of the metal intercalated layer compounds FexTaS2 (0.20⩽x⩽0.34) are reported. The compounds are metallic, ferromagnetic and have large coercive force. ME measurements show the iro…
The pressure effect on the Curie point of the Heusler alloys Ni2MnSn and Ni2MnSb was measured. The pressure coefficients of the Curie point were determined to be (1/Tc) (dTc/dp) = 1.6×10−3 1/kbar for Ni2MnSn and 9×10−3 1/kbar for Ni2MnSb, respectively. The volume exchange striction of Ni2MnSn was also studied. The pre…
The resistivity, Seebeck coefficient, Hall coefficient, and superconducting transition temperature have been measured in ${\mathrm{K}}_{x}$ W${\mathrm{O}}_{3}$ for $0.20<~x<~0.32$ over the temperature rangee 1.5 to 375 K. The normal-state transport properties show temperature- and composition-dependent anomalies…
Abstract A fast physical method is used to measure oxygen solubilities in various solutions of sugars and salts, in nutrition media, and in fermentation broths of Penicillium chrysogenum . The findings were compared with the predictions of a solubility model which assumes that the solubility reduction is log‐additive…
Solution and solid state studies of TCNQF4 are reported. The electron affinity of TCNQF4 has been derived from spectral observations of the visible-near IR charge-transfer band for the pyrene complex and compared to that derived from the half-wave potentials used to characterize its reactivity in solution. It is demon…
Normal-state electrical resistivity has been studied in Cu-Nb composites containing 7.5, 10.0, and 15.0 vol% niobium filaments formed by an in situ process. The resistivity of the as-drawn and annealed composite wires was measured at temperatures between 300 and 825 K and just above the superconducting transition (∼9…
Polymeric iron (III) complexes of malonic, succinic, furmaric, and phthalic acids have been prepared and studied by variable-temperature (15-300 K) magnetic susceptibility, 57Fe Mossbauer spectroscopy, and infrared spectroscopy. In addition, properties of iron(III) acetate have been reinvestigated using these same tec…
Abstract Powders of nylon 66 were crystallized from solution in methanol and in other solvents. These powders exhibit a latent heat of about 4.5 cal/g at the Brill transition near 200°C where the unit cell changes from a triclinic to a pseudohexagonal form. The dimensions of the hydrogen‐bonded sheets are almost uncha…
Heat-treatment methods for obtaining low core loss in Fe rich amorphous alloys with high magnetic induction and the physical mechanism concerned will be discussed. Field annealing is necessary to avoid inducing local magnetic anisotropies or magnetic domain wall fixing, and then to make stress relieving effective. Con…
Raman and infrared spectra of rhombohedral selenium have been measured and the fundamental bands observed in these spectra are assigned by analogy to the S 6 ring molecule. Calculation of the normal mode vibration for the Se 6 ring using a modified Urey-Bradley force field confirms this assignment. Anomalous softening…
The explosion hazard of methane-air mixtures has become an increasingly serious problem in mining, and an advance assessment of methane gas potential is therefore essential for a safe and economic mine development program. As part of its coal mine health and safety program, the Bureau of Mines has developed a simple,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of carbon deposition during methanation of carbon monoxideDavid C. Gardner and Calvin H. BartholomewCite this: Ind. Eng. Chem. Prod. Res. Dev. 1981, 20, 1, 80–87Publication Date (Print):March 1, 1981Publication History Published online1 May 2002Published inissue 1 M…
The crystallographic and the magnetic structures of Y(Mn1−xFex)12 intermetallic compounds were investigated. They crystallize in the ThMn12 structure type. The Y atoms occupy the 2(a) sites and the transition metals are distributed on 3 nonequivalent sites 8i, 8j, and 8f. We have determined the solid solubility limit…
No abstract available.
Abstract The balance of surface charge in a soil is developed from the perspective of coordination chemistry and is employed to derive the conditions under which the zero point of charge is equal either to the crossover point of two proton titration curves or to the point of zero net charge (point of equality between…