Deformation of the plasma concentration profile due to the modulated electron beam

Report is devoted to the numerical simulation of the electron beam with the longitudinal modulation moving along the concentration gradient of the planarly stratified plasma with the initially linear profile (one-dimensional model). Nonlinear modification of the plasma concentration profile due to the HF electric field excited by the beam is studied. The stationary case and initial problem were calculated

Coulomb Correlations and Magnetic Anisotropy in ordered L10L1_0 CoPt and FePt alloys

We present results of the magneto-crystalline anisotropy energy (MAE) calculations for chemically ordered $L1_0$ CoPt and FePt alloys taking into account the effects of strong electronic correlations and spin-orbit coupling. The local spin density + Hubbard U approximation (LSDA+U) is shown to provide a consistent picture of the magnetic ground state properties when intra-atomic Coulomb correlations are included for both 3$d$ and 5$d$ elements. Our results demonstrate significant and complex contribution of correlation effects to large MAE of these material.Comment: revised version; 4 pages, 2 figure

Abundance, Distribution and Potential Activity of Methane Oxidising Bacteria in Permafrost Soils from the Lena Delta, Siberia

The methane oxidation potential of active layer profiles of permafrost soils from the Lena Delta, Siberia, was studied with regard to its respond to temperature, and abundance and distribution of type I and type II methanotrophs. Our results indicate vertical shifts within the optimal methane oxidation temperature and within the distribution of type I and type II methanotrophs. In the upper active layer, maximum methane oxidation potentials were detected at 21 °C. Deep active layer zones that are constantly exposed to temperatures below 2 °C showed a maximum potential to oxidise methane at 4 °C. Our results indicate a dominance of psychrophilic methanotrophs close to the permafrost table. Type I methanotrophs dominated throughout the active layer profiles but their number highly fluctuated with depth. In contrast, type II methanotrophs were constantly abundant through the whole active layer and displaced type I methanotrophs close to the permafrost table. No correlation between in-situ temperatures and the distribution of type I and type II methanotrophs was found. However, the distribution of type I and type II methanotrophs correlated significantly with in-situ methane concentrations. Beside vertical fluctuations, the abundance of methane oxidisers also fluctuated according to different geomorphic units. Similar methanotroph cell counts were detected in samples of a flood plain soil and a polygon rim soil, whereas cell counts in samples of a polygon centre soil were up to 100 times lower

OD ESR signals of excess electrons in liquid hydrocarbons depending on the geminate recombination parameters, theory and experiment

The intensity of optically detected ESR (OD ESR) signals from radical-ion pairs in solution under ionizing irradiation has been investigated experimentally and theoretically as a function of the microwave power, the geminate recombination parameters, the diffusion coefficient, the distance distribution function of pairs, and the spin-lattice relaxation time. In line with theoritical predictions, the temperature dependence of an OD ESR signal has been shown to have a maximum depending on the microwave power. The experimental dependence has been measured for the system e- + triethylamine+ (TEA) in 3-methylpentane. Agreement between the theoretical and experimental dependences is discussed. © 1985