Vladimir Timoshevskii

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We present a joint experimental and theoretical study of the superconductivity in doped silicon clathrates. The critical temperature in Ba(8)@Si-46 is shown to strongly decrease with applied pressure. These results are corroborated by ab initio calculations using MacMillan's formulation of the BCS theory with the electron-phonon coupling constant lambda(More)
The frequency of spontaneous aneuploidy of the four autosomes and sex chromosomes in the interphase nuclei of cultivated and uncultured lymphocytes from clinically healthy men was examined by use of two-color fluorescent in situ hybridization (FISH). It was shown that in uncultured cells from the individuals examined autosomal nullosomies were practically(More)
First-principles calculations show that atomic-scale surface roughness dramatically affects the electrical conductivity of thin films. Atomic clusters, 1–3 atoms high, deposited on the flat Cu 001 surface of an 11 monolayer thick film lead to a 30−40% reduction of its conductance. This is attributed to the destruction of isotropic Fermi surface sheets. We(More)
We present a theoretical study of a new hybrid material, nanostructured polymeric nitrogen, where a polymeric nitrogen chain is encapsulated in a carbon nanotube. The electronic and structural properties of the new system are studied by means of ab initio electronic structure and molecular dynamics calculations. Finite temperature simulations demonstrate(More)
Youqi Ke,1 Ferdows Zahid,1 V. Timoshevskii,1 Ke Xia,2 D. Gall,3 and Hong Guo1 1Department of Physics and Centre for the Physics of Materials, McGill University, Montreal, PQ, Canada H3A 2T8 2Department of Physics, Beijing Normal University, Beijing 100875, China 3Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New(More)
We report ab initio calculations of nonequilibrium quantum transport properties of Fe/MgO/Fe trilayer structures. The zero bias tunnel magnetoresistance is found to be several thousand percent, and it is reduced to about 1000% when the Fe/MgO interface is oxidized. The tunnel magnetoresistance for devices without oxidization reduces monotonically to zero(More)
The analysis of plutonium production factors has been carried out by using two methodical approaches: assessment of chromosomal aberrations level in routine and G-banded metaphases and molecular-cytogenetic investigation of aneugenic/clastogenic damages in cytokinesis-block binuclear lymphocytes by FISH with centromere specific DNA probes. The obtaining(More)
Lithium is the key element for the development of battery and new technology and the development of an analytical technique to spatially and quantitatively resolve this element is of key importance. Detection of Li K in pure metallic lithium is now possible in the Scanning Electron Microscope (SEM) with newly designed Energy Dispersive Spectroscopy (EDS).(More)
The frequency of spontaneous X-chromosome hypo- and hyperploidy was studied in interphase nuclei of cultured and uncultured blood lymphocytes and oral epithelium of 21 healthy individuals by means of fluorescence in situ hybridization of the centromere-specific DNA probe. In women, the frequencies of haploid epithelial cells and cultured and uncultured(More)
Iron nitride Fe 4 N is studied by full-potential LAPW method. Structure parameters, electronic and magnetic properties as well as hyperfine interaction parameters are obtained. We observe perfect agreement with experimental results. Hypothetical Fe 4 N structure was also calculated to study the influence of disordering effects on parameters of Mössbauer(More)