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排序方式: 共有97条查询结果,搜索用时 15 毫秒
31.
I. D. Loshkarev E. M. Trukhanov K. N. Romanyuk M. M. Kachanova 《Bulletin of the Russian Academy of Sciences: Physics》2012,76(3):374-377
A model for determining the critical thickness of a film h
c is developed to introduce misfit dislocations in the slip planes of a film and a substrate parallel to the interphase boundary
(111). Experimental values h
c that agree with calculated values are determined for the Ge/Si(111) and Si3N4/Ge(111) heterosystems. The two-level epitaxial growth of Ge on Si is attained in the regime of combining the step-layer and
2D island growth mechanisms. 相似文献
32.
A. V. Kolesnikov A. S. Ilin E. M. Trukhanov A. P. Vasilenko I. D. Loshkarev A. S. Deryabin 《Bulletin of the Russian Academy of Sciences: Physics》2011,75(5):609-612
A method for determining the structural parameters of epitaxial layers by X-ray difractometry was developed. The proposed
model allows us to analyze the triclinic distortions that arise in heterosystems with nonsingular orientations. Slew angles
of dislocation film lattice Ge
x
Si1 − x
with respect to Si substrate have been obtained. 相似文献
33.
A network-based data mining approach to portfolio selection via weighted clique relaxations 总被引:1,自引:0,他引:1
Vladimir Boginski Sergiy Butenko Oleg Shirokikh Svyatoslav Trukhanov Jaime Gil Lafuente 《Annals of Operations Research》2014,216(1):23-34
We introduce a new network-based data mining approach to selecting diversified portfolios by modeling the stock market as a network and utilizing combinatorial optimization techniques to find maximum-weight s-plexes in the obtained networks. The considered approach is based on the weighted market graph model, which is used for identifying clusters of stocks according to a correlation-based criterion. The proposed techniques provide a new framework for selecting profitable diversified portfolios, which is verified by computational experiments on historical data over the past decade. In addition, the proposed approach can be used as a complementary tool for narrowing down a set of “candidate” stocks for a diversified portfolio, which can potentially be analyzed using other known portfolio selection techniques. 相似文献
34.
M. N. Smirnova A. A. Geras’kin A. I. Stognii O. L. Golikova A. V. Bespalov A. V. Trukhanov M. A. Kop’eva E. N. Beresnev V. A. Ketsko 《Russian Journal of Inorganic Chemistry》2014,59(7):778-782
The results of analysis of conceivable interactions between film and substrate materials during crystallization of Mg(Fe0.8Ga0.2)2O4-δ films with SiO2 and TiO2 buffer layers on silicon are reported. The calculated data are compared with the physicochemical parameters of Mg(Fe0.8Ga0.2)2O4-δ/Si, Mg(Fe0.8Ga0.2)2O4-δ/TiO2/Si, and Mg(Fe0.8Ga0.2)2O4-δ/SiO2/Si film heterostructures. 相似文献
35.
M. L. Keshtov D. V. Marochkin V. S. Kochurov P. V. Komarov D. Yu. Parashchuk V. A. Trukhanov A. R. Khokhlov 《Polymer Science Series B》2014,56(1):89-108
Four new alternating narrow-band-gap copolymers based on benzodithiophene are synthesized under conditions of the Stille reaction. In comparison to benzodithiophene homopolymers, all these copolymers show good solubility in common organic solvents and broad absorption in the visible spectrum of sunlight. The band gaps of the polymer films, as estimated from the cyclic voltammetry data, vary within 1.34–2.28 eV, and the position of the highest occupied molecular orbital lies in the range 4.99–5.72 eV. The values of the open-circuit voltage and the efficiency of polymer solar cells based on the copolymers are within 0.22–0.65 V and 0.02–0.48%, respectively. 相似文献
36.
S. V. Trukhanov A. V. Trukhanov A. N. Vasil’ev A. Maignan H. Szymczak 《JETP Letters》2007,85(10):507-512
For La 0.825 3+ Sr 0.175 2 +Mn3+O 2.912 2? anion-deficient manganite, the specific magnetization, the dynamic magnetic susceptibility, and the heat capacity are investigated. This material is found to be an inhomogeneous ferromagnet below the Curie point T C ≈ 122 K, which is much lower than the Curie point determined for the stoichiometric composition (T C ≈ 268 K). An increase in magnetic field by two orders of magnitude leads to an increase in the Curie temperature by ΔT ≈ 12 K. The presence of oxygen vacancies leads to the frustration of a part, namely, V fr ≈ 22%, of the indirect Mn3+-O-Mn3+ exchange interactions, but the spin glass state is not realized. The ferromagnetic matrix of the material under study is characterized by a scatter in the exchange interaction intensities. The heat capacity is found to exhibit an anomalous behavior. Based on the Banerjee magnetic criterion, it is established that the ferromagnet-paramagnet transition observed for La 0.825 3+ Sr 0.175 2+ Mn3+O 2.912 2? anion-deficient manganite is a second-order thermodynamic phase transition. The mechanism and origin of the critical behavior of the system under investigation are discussed. 相似文献
37.
Alex Trukhanov Larisa Panina Sergei Trukhanov Vitalii Turchenko Mohamed Salem 《中国物理 B》2016,25(1):16102-016102
The investigations of the crystal and magnetic structures of the Ba Fe12-xAlx O19(x = 0.1–1.2) solid solutions have been performed with powder neutron diffractometry. Magnetic properties of the Ba Fe12-xAlx O19(x = 0.1–1.2) solid solutions have been measured by vibration sample magnetometry at different temperatures under different magnetic fields.The atomic coordinates and lattice parameters have been Rietveld refined. The invar effect is observed in low temperature range(from 4.2 K to 150 K). It is explained by the thermal oscillation anharmonicity of atoms. The increase of microstress with decreasing temperature is found from Rietveld refinement. The Curie temperature and the change of total magnetic moment per formula unit are found for all compositions of the Ba Fe12-xAlx O19(x = 0.1–1.2) solid solutions. The magnetic structure model is proposed. The most likely reasons and the mechanism of magnetic structure formation are discussed. 相似文献
38.
S.V. Trukhanov D.P. Kozlenko A.V. Trukhanov 《Journal of magnetism and magnetic materials》2008,320(14):e88-e91
The magnetic state of La0.70Sr0.30MnOx (x=2.85, 2.80) anion-deficient manganites is studied experimentally under hydrostatic pressure up to 5.2 GPa. These materials possessing the properties of a spin-glass state. The La0.70Sr0.30MnO2.85 exhibits a coexistence of the rhombohedral (R3¯c) and tetragonal (I4/mcm) crystal structures and below Tf 50 K the spin-glass state is formed. The La0.70Sr0.30MnO2.80 exhibits the tetragonal (I4/mcm) crystal structure. For this compound a phase-separated magnetic state below Tf is formed, involving coexistence of C-type antiferromagnetic (AFM) clusters within spin-glass matrix. In both compounds the crystal structure and magnetic states remain stable upon compression. Under the hydrostatic pressure up to 1 GPa, the La0.70Sr0.30MnO2.85 is a spin glass with a smeared phase transition to the paramagnetic state. The freezing temperature Tf of the magnetic moments of the ferromagnetic clusters increases at a rate of 4.30 K/GPa and the magnetic ordering temperature TMO increases at a rate of 12.90 K/GPa. The enhancement of the ferromagnetic properties of La0.70Sr0.30MnO2.85 anion-deficient manganite under hydrostatic pressure is explained by the redistribution of oxygen vacancies and a decrease in the unit cell parameters. 相似文献
39.
E. M. Trukhanov A. P. Vasilenko I. D. Loshkarev A. V. Kolesnikov 《Bulletin of the Russian Academy of Sciences: Physics》2014,78(4):307-310
Misfit stress relaxation processes in a semiconductor heterosystem are divided into optimal and nonoptimal. Depending on the type of a process and degree of its completeness, four variants of a uniform stress field are established and experimentally detected in the surface layer of an epitaxial film. The interaction between threading dislocations that favors the transformation of nonoptimal relaxation into optimal is investigated. 相似文献
40.
S.V Trukhanov N.V Kasper I.O TroyanchukM Tovar H SzymczakK Bärner 《Journal of solid state chemistry》2002,169(1):85-95
The crystal structure, magnetic and electrical properties of the La1−xCaxMnO3−γ (x=0.30, 0.50; 0?γ?0.50) oxygen-deficient manganites have been studied. It is found that the compounds La0.70Ca0.30MnO3−γ possess a long-range ferromagnetic order up to γ=0.06 and a cluster spin glass behavior at 0.06<γ?0.20. Antiferromagnetic state of La0.50Ca0.50MnO3−γ (γ=0) composition transforms into inhomogeneous ferromagnetic one at γ=0.04. The system converts into cluster spin glass state at γ=0.10. As oxygen deficit reaches the value γ=0.25, a new type of ferromagnetic phase appears. The fraction of this ferromagnetic phase is the highest in the composition γ=0.30. It is supposed that the compounds with γ?0.35 represent an antiferromagnetic medium with inclusions of the ferromagnetic phase. The strongly reduced samples exhibit a large magnetoresistance below the temperature, at which the spontaneous magnetization develops. The magnetic phase diagrams of both La0.70Ca0.30MnO3−γ and La0.50Ca0.50MnO3−γ systems have been constructed. We argue, that the oxygen vacancies are disordered in the La0.70Ca0.30MnO3−γ system in the studied region of oxygen vacancies concentration (0?γ<0.20) whereas for the La0.50Ca0.50MnO3−γ they tend to order at γ>0.25 in a manner of Sr2Fe2O5-type crystal structure. This study shows that Mn3+-O-Mn3+ ferromagnetic interaction may play an important role in the formation of magnetic state of manganites. 相似文献