Screw dislocation in spherical particle

The elastic fields generated by a straight-line screw dislocation axially arranged in a spherical particle have been calculated and analyzed. Some features of the distribution of elastic fields in this case and in the case of a screw dislocation lying along the axis of a cylindrical whisker are similar. The elastic energies per unit dislocation length differ slightly in the two cases. This corroborates the validity of application of some of the results obtained for screw dislocations in elastic cylinders to the study of properties of screw dislocations in equiaxed particles.Authors are very indebted to dr. A. B. Lebedev for his kind support.     

Effect of phase composition of palladium-ruthenium membrane catalyst on selectivity of dehydrolinalool hydrogenation

Conclusions When the hydrogenation of dehydrolinalool to linalool is run on a Pd alloy containing 6 wt.% of Ru, which is lean in the -hydrogen phase, the selectivity is much greater than when the amount of the -hydrogen phase is greater. A high selectivity of the hydrogenation is achieved by reducing to a definite limit the amount of hydrogen in the membrane catalyst without using inhibitors of the side reactions, which can contaminate the hydrogenation products.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 926–928, April, 1984.     

Programming package “ESCAPAK” for calculations of electronic structure,adapted for the ES series computers

Branch of the Institute of Chemical Physics, Academy of Sciences of the USSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 30, No. 3, pp. 132–134, May–June, 1989.     

Effect of the structure of substituted propargyl and allyl alcohols on the rate of their liquid phase hydrogenation on a Pd-Ru alloy membrane catalyst

The rates of hydrogenation of substituted propargyl and allyl alcohols in the liquid phase on a Pd-Ru alloy membrane catalyst are described by a two-parameter Taft equation which takes into account the inductive and steric effects of the substituents. The values of the parameters at 363 K with H₂ at atmospheric pressure are: ^*=–0.20, =0.10 and ^*=–1.1, =1.3 respectively.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1740–1745, August, 1989.     

Conversion of cyclohexene on a gold-plated palladium-nickel membrane catalyst

Under flow conditions, on the gold-covered external surface of a tube made of Pd containing 5.9% Ni cyclohexene is dehydrogenated into benzene and the hydrogen formed does not desorb but is consumed in cyclohexene hydrogenation to cyclohexane and diffuses through the membrane catalyst. In the presence of added hydrogen, cyclohexene hydrogenation takes place below 200°C. Upon the introduction of hydrogen through the membrane catalyst the hydrogenation rate strongly increases relative to the case when hydrogen is fed in mixture with cyclohexene vapors.

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- , Pd–Ni (5,9%), , . 200 °C, , .

     

Galvanomagnetic and Thermomagnetic Properties of a Nonideal Xenon Plasma at Megabar Pressures in Megagauss Magnetic Fields

A method has been developed for the calculation of tensors of the electrical conductivity, Seebeck coefficient, and thermal conductivity of a nonideal plasma in a magnetic field within a unified approach where the kinetic coefficients are calculated together with the equation of state of the nonideal plasma within a quasichemical model. The calculations have shown that the Seebeck coefficient in xenon reaches 3 mV/K, which is slightly smaller than that in hydrogen or deuterium, and the figure of merit appears to be insignificantly higher in xenon. Consequently, the transition from hydrogen (deuterium) to xenon does not result in the expected noticeable improvement of thermoelectric properties. This is due to lower values of the Seebeck coefficient and electrical conductivity, as well as to a fast increase in the thermal conductivity of neutral xenon with an increase in its density. It has been shown for the first time that there is a density range where all components of the Seebeck tensor in xenon change their sign because of the Ramsauer minimum in the cross section for scattering of electrons on neutral atoms in the region of comparable values of cyclotron and transport frequencies of electrons.