Nonsimplicity of the group of unimodular automorphisms of the affine plane

It is proven that the group of automorphisms of the affine plane (as ao algebraic manifold), with Jacobian equal to 1, is not simple.Translated from Matematicheskie Zametki, Vol. 15, No. 2, pp. 289–293, February, 1974.     

Shape recovery effects in deformed NaCl whiskers

Processes of shape recovery by NaCl whiskers, previously deformed by bending, are studied. The studies reveal that there are two successive stages in the recovery, developing at different temperatures. A relation is established between recovery effect and the internal friction in whiskers.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 76–80, December, 1978.     

Formation of half-metallic MnAs and MnP layers

Half-metallic MnAs and MnP layers were grown on GaAs substrates by the laser sputtering of a metal Mn target in a hydrogen and arsine (phosphine) flow. The effect of the arsine concentration in the gascarrier and the substrate temperature (T _g = 300—450°C) on the crystal structure and electrical and magnetic properties were determined. It was shown that MnP samples grown at T _g ≥ 400°C exhibit ferromagnetic properties up to 300 K, according to Hall effect measurements.     

Study of decay mechanisms in B--->Lambdac+ppi- decays and observation of low-mass structure in the Lambdac+p system

Using a sample of 152 x 10(6) BB pairs accumulated with the Belle detector at the KEKB e+e- collider, we study the decay mechanism of three-body charmed decay B- --> Lambdac+ ppi-. The intermediate two-body decay B--->Sigmac (2455)0 p is observed for the first time with a branching fraction of (3.7 +/- 0.7 +/- 0.4 +/- 1.0) x 10(-5) and a statistical significance of 8.4sigma. We also observe a low-mass enhancement in the (Lambdac+p) system, which can be parametrized as a Breit-Wigner function with a mass of (3.35(-0.02)(+0.01) +/-0.02) GeV/c2 and a width of (0.07(-0.03)(+0.04) +/-0.04) GeV/c2. We measure its branching fraction to be (3.9(-0.7)(+0.8) +/- 0.4 +/- 1.0) x 10(-5) with a statistical significance of 6.2sigma. The errors are statistical, systematic, and that of the Lambdac+-->pK- pi+ decay branching fraction.     

The impact of the layer thickness on the thermodynamic properties of pd hydride thin film electrodes

Recently, a lattice gas model was presented and successfully applied to simulate the absorption/desorption isotherms of various hydride-forming materials. The simulation results are expressed by parameters corresponding to several energy contributions, e.g., interaction energies. However, the use of a model system is indispensable in order to show the strength of the simulations. The palladium-hydrogen system is one of the most thoroughly described metal hydrides found in the literature and is therefore ideal for this purpose. The effects of decreasing the thickness of Pd thin films on the isotherms have been monitored experimentally and subsequently simulated. An excellent fit of the lattice gas model to the experimental data is found, and the corresponding parameters are used to describe several thermodynamic properties. It is analyzed that the contribution of H-H interaction energies to the total energy and the influence of the host lattice energy are significantly and systematically changing as a function of Pd thickness. Conclusively, it has been verified that the lattice gas model is a useful tool to analyze thermodynamic properties of hydrogen storage materials.