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排序方式: 共有227条查询结果,搜索用时 31 毫秒
1.
Grigoriev M. V. Krivonosov Yu. S. Buzmakov A. V. Chukalina M. V. Asadchikov V. E. Uvarov V. I. 《Crystallography Reports》2021,66(6):1100-1108
Crystallography Reports - X-ray microtomography is used for non-destructive reconstruction of the internal morphological structure of objects. The influence of the tomographic experiment conditions... 相似文献
2.
A. S. Prokhorov E. S. Zhukova A. A. Boris I. E. Spektor B. P. Gorshunov V. S.Nozdrin E. A. Motovilova L. S. Kadyrov S. Zapf S. Haindl K. Iida M. Dressel K. V. Chizh M. S. Storozhevykh L. V. Arapkina V. A. Chapnin O. V. Uvarov V. P. Kalinushkin V. A. Yuryev 《Radiophysics and Quantum Electronics》2014,56(8-9):620-627
3.
Vladimir M. Uvarov Dimitry A. de Vekki 《Phosphorus, sulfur, and silicon and the related elements》2020,195(5):376-387
AbstractUsing a “chiral pool” approach, a number of chiral thiolate and sulfide ligands based on natural terpenes and terpenoids have been synthesized in a few simple steps. Two new Rh-thiolate complexes with the formula [Rh(CO)2(μ-SR)]2 were obtained. The influence of these complexes and catalytic systems formed by combining the synthesized ligands with [Rh(CO)2(μ-Cl)]2 and [Rh(cod)(μ-Cl)]2, on the reaction rate, chemoselectivity, stereoselectivity and formation of tetraphenyldisiloxane in Rh-catalyzed asymmetric hydrosilylation of acetophenone as a model reaction have been studied. Mechanistic aspects of formation of silyl enol ether as a side product in the presence of S-containing ligands are presented. 相似文献
4.
Dynamic fragmentation scaling is analyzed using basic statistical distributions and statistical models that take into account the role of wave effects on the fragment size. The application of symmetry analysis to the modeling of solids with defects based on self-similar solutions for stress and defect density fields is discussed. Fragmentation statistics is described as critical phenomena during evolution of the defect system. 相似文献
5.
Asanbaeva Nargiz B. Rychkov Denis A. Tyapkin Pavel Yu. Arkhipov Sergey G. Uvarov Nikolay F. 《Structural chemistry》2021,32(3):1261-1267
Structural Chemistry - The crystal and molecular structure of tris(tetrabutylammonium) pentanitratoplumbate(II) was determined and characterized by single-crystal and powder X-ray diffraction and... 相似文献
6.
D. V. Uvarov 《Physics of Particles and Nuclei Letters》2011,8(3):272-278
We review the Type IIA superstring on the AdS 4 × ??3 background in the κ-symmetry light-cone gauge characterized by the choice of the light-like directions from the D = 3 Minkowski boundary of AdS 4 both in the Lagrangian and Hamiltonian formulations. 相似文献
7.
D. B. Vasil’chenko S. V. Korenev I. A. Baidina V. A. Drebushchak N. K. Moroz S. G. Kozlova A. S. Ulikhin N. F. Uvarov 《Russian Journal of Electrochemistry》2011,47(5):631-636
The method of deposition from solutions was used to synthesize [RhL
4Cl2]HSO4 · nH2SO4 · mH2O complex salts (L = Py, γ-picoline), n ≈ 0.5−0.6, m ≈ 5−6. According to the data of X-ray phase analysis, the crystal structure of these salts is formed by layers of cations
separated by layers consisting of anions molecules of sulfuric acid and water connected through a system of hydrogen bonds.
Calorimetric methods were used to study phase transitions and the range of thermal stability of salts. The method of 1H NMR spectroscopy discovered that protons within the {HSO4− · nH2SO4 · mH2O} subsystem featured enhanced conductivity. Conductivity studies showed that trans-[RhL
4Cl2]HSO4 · nH2SO4 · mH2O samples had high proton conductivity. 相似文献
8.
A. A. Blinkin V. V. Derevyanko T. V. Sukhareva V. L. Uvarov V. A. Finkel Yu. N. Shakhov I. N. Shlyakhov 《Physics of the Solid State》2011,53(2):245-255
This paper reports on the results of investigations of the influence of irradiation of the two-band BCS superconductor MgB2 by electrons with an average energy $
\bar {\rm E}
$
\bar {\rm E}
∼ 10 MeV at high doses (0 ≤ ϕt ≤ ∼2.5 × 1018 cm−2) on the temperature and width of the transition to the superconducting state, the temperature dependence of the electrical
resistivity in the normal state, the crystal lattice parameters, and the diffraction line intensity. An increase in the electron
irradiation dose ϕt leads to the following effects: a decrease in the critical temperature T
c
; an increase in the width of the superconducting transition ΔT
c
; and a decrease in the “residual electrical resistivity” ρ273 K/ρ40 K, in the parameters a and c of the hexagonal crystal lattice, and in the ratio between the diffraction line intensities I
110/I
100. From analyzing the results obtained, it has been established that the main type of radiation damages under irradiation of
the BCS superconductor MgB2 by high-energy electrons is the formation of vacancies in the B sublattice, which leads to a narrowing of the large band
gap Δσ on the Fermi surface. 相似文献
9.
10.
E. A. Koteneva N. N. Pestereva I. E. Animitsa N. F. Uvarov 《Russian Journal of Electrochemistry》2017,53(7):739-743
Metal molybdates MMoO4 (M = Ca, Sr) and their composites with vanadium oxide V2O5 were synthesized. An X-ray diffraction analysis confirmed that the obtained molybdates were single-phase, and the heterogeneous systems were two-phase. The temperature dependences of the total conductivity of the composites were studied. The ion transport numbers in the {CaMoO4 · xV2O5} composites (x = 1–30 mol %) were studied by the EMF method. The conductivity of the composites at x ≤ 5 mol % was shown to be ionic. The conductivity of the composites was described using the mixing equation. 相似文献