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Aplesnin, S. S.
Modeling a dimer state in CuGeO3 in the two-dimensional anisotropic Heisenberg model with alternated exchange interaction / S. S. Aplesnin // J. Exp. Theor. Phys. - 1997. - Vol. 85, Is. 6. - P. 1196-1203, DOI 10.1134/1.558393. - Cited References: 33 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
SPIN-PEIERLS TRANSITION
   HIGH MAGNETIC-FIELDS
   COMPOUND CUGEO3
   GROUND-STATE
   SYSTEMS
   NEUTRON
Аннотация: The two-dimensional Heisenberg spin-1/2 model with alternated exchange interaction along the c axis and an anisotropic distribution of the exchange interaction in the lattice, J(b)/J(c)=0.1, is examined. A quantum Monte Carlo method is used to calculate the phase diagrams of the antiferromagnet, the dimer state in a plane, the value of the alternation delta of the exchange interaction, and the anisotropy Delta=1-J(xy)/J(z) of the exchange interaction, Delta similar to delta(0.58(6)). The following characteristics are calculated for Delta=0.25: the dependence of the temperature of the dimer-state-paramagnet transition on the alternation of the exchange interaction, T-c(delta)=0.55(4(delta-0.082(6))(0.50(3)), the singlet-triplet energy gap, and the dependence of the magnetization on the external field for some values of delta. The value of the exchange interaction, J(c)=127 K, the alternation of the exchange interaction, delta=0.11J(c), and the correlation radius along the c axis, xi(c) approximate to 28c, are determined. Finally, it is found that the temperature dependence of the susceptibility and the specific heat are in good agreement with the experimental data. (C) 1997 American Institute of Physics. [S1063-7761(97)01912-4].

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Аплеснин, Сергей Степанович
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    Computation of effective elastic constants in anisotropic microseamy rocks / G. T. Prodaivoda [и др.] // Geol. Geofiz. - 2000. - Vol. 41, Is. 3. - P. 436-449. - Cited References: 25 . - ISSN 0016-7886
Рубрики:
WAVE-PROPAGATION
   SYMMETRY
Кл.слова (ненормированные):
anisotropy -- modeling -- orientation of microcracks -- elastic waves
Аннотация: A generalized method of conditional moments for computation of effective elastic constants of anisotropic rocks with spatially oriented microcracks is considered. The method involves an additional operation of averaging of known solution data for a modeled rock of orthorhombic structure with ellipsoidal microcracks whose semiaxes are oriented along the coordinate axes. The averaging is performed using the distribution function of rock microcrack orientations, which is expanded into a series in terms of generalized spherical functions. The expansion coefficients are determined by an experiment. In calculating the effective elastic constants of anisotropic rocks, there are no constraints on the concentration of microcracks. We have studied the parameters of azimuthal anisotropy of elastic-wave velocities in modeled amphibolites with ellipsoidal hornblende grains oriented along the coordinate axes and with three-planar and spatially oriented systems of microcracks. The obtained results agree with experimental data of ultrasonic determinations of elastic constants for amphibolite samples.

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Публикация на русском языке Метод расчета эффективных упругих постоянных в анизотропных микротрещиноватых горных породах [Текст] / Г. Т. Продайвода [и др.] // Геол. и геофиз. - 2000. - Т. 41 № 3. - С. 436-449

Держатели документа:
Univ Kiel, UA-252022 Kiev, Ukraine
Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
Natl Acad Sci Ukraine, Inst Mech, UA-252017 Kiev, Ukraine
ИФ СО РАН

Доп.точки доступа:
Prodaivoda, G. T.; Продайвода, Георгий Трофимович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Vyzhva, S. A.; Nazarenko, L. V.
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Transport properties of HTSC-based composites: Modeling the random networks of Josephson weak links with magneto-active barriers. / K. A. Shaihutdinov [et al.] // J. Low Temp. Phys. - 2003. - Vol. 130, Is. 3-4. - P. 347-381, DOI 10.1023/A:1022204705059. - Cited References: 89 . - ISSN 0022-2291

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
CURRENT-VOLTAGE CHARACTERISTICS
   HIGH-TEMPERATURE SUPERCONDUCTORS
   SNS JUNCTIONS
   THERMAL FLUCTUATIONS
   RESISTIVE PROPERTIES
   PERCOLATION SYSTEM
   TRANSITION
   YBA2CU3O7
   BOUNDARY
   OXIDES
Кл.слова (ненормированные):
Crystalline materials -- Electric insulators -- Josephson junction devices -- Magnetic devices -- Magnetic barriers -- Superconducting materials -- composite
Аннотация: The results of the study of transport properties (temperature dependences of resistivity and critical current, current-voltage characteristics) of two-phase composites on the basis of Y3/4Lu1/4Ba2Cu3O7 high-temperature superconductor (HTSC) produced by fast baking technique and modelling networks of Josephson-type weak links are reported. Non-superconducting ingredients with different magnetic structures, insulators and normal metals, function as barriers between HTSC crystallites. Besides strong suppression of superconducting properties in HTSC composites with magnetic barriers, anomalous behavior of temperature dependences of resistivity below T-c of HTSC grains have been observed and investigated.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian St. Aerosp. Univ., Krasnoyarsk 660014, Russian Federation
Krasnoyarsk State University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Shaihutdinov, K. A.; Balaev, D. A.; Балаев, Дмитрий Александрович; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Popkov, S. I.; Попков, Сергей Иванович; Petrov, M. I.; Петров, Михаил Иванович; NATO Advanced Research Workshop on Vortex Dynamics in High-Temperature Superconductors(2002 ; May ; 17-22)
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Zobov, V. E.
Modeling multiparticle coherences in solid-state nuclear spin systems using infinite-range interaction / V. E. Zobov, A. A. Lundin // Theor. Math. Phys. - 2004. - Vol. 141, Is. 3. - P. 1737-1749, DOI 10.1023/B:TAMP.0000049765.41265.dd. - Cited References: 24 . - ISSN 0040-5779

РУБ Physics, Multidisciplinary + Physics, Mathematical
Рубрики:
MULTIPLE-QUANTUM DYNAMICS
   NMR-SPECTRA
   TEMPERATURE DYNAMICS
   SHAPE
   VAN
Кл.слова (ненормированные):
multipulse method -- dipole-dipole interaction -- multispin coherence -- time correlation function -- rotating reference frame -- dipole-dipole interaction -- multipulse method -- multispin coherence -- rotating reference frame -- time correlation function
Аннотация: Using the exactly solvable model known in statistical physics as the infinite-range interaction model (the van der Waals model), we obtain expressions for the hierarchy of multispin multiquantum time correlation functions for a solid-state paramagnetic nuclear spin system with magnetic dipole-dipole interaction between nuclei. These functions are observed experimentally using contemporary multiquantum NMR spectroscopy methods. We write the complete set of orthogonal multispin operators explicitly and find the time dependence for amplitudes of multiparticle time correlation functions. The proposed model describes the behavior of multiparticle correlation functions well, at least for not very large numbers n of expansion harmonics. The theoretical results agree well with the experimental data obtained for hexamethylbenzol.

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Держатели документа:
RAS, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk, Russia
RAS, NN Semenov Chem Phys Inst, Moscow, Russia
ИФ СО РАН
Kirenskii Institute for Physics, Siberian Branch, RAS, Krasnoyarsk, Russia, Russian Federation
Semenov Inst. for Chemical Physics, RAS, Moscow, Russia, Russian Federation

Доп.точки доступа:
Lundin, A. A.; Зобов, Владимир Евгеньевич
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Photonic crystals with resonantly absorbing defects / V. G. Arkhipkin [et al.] ; ed. Vetrov, SY // LFNM 2006: 8th International Conference on Laser and Fiber-Optical Networks Modeling, Proceedings : IEEE, 2006. - P. 313-316. - Cited References: 12 . - ISBN 1-4244-0233-6

РУБ Instruments & Instrumentation + Optics + Telecommunications
Рубрики:
MICROCAVITIES
DISPERSION
SPECTRA
Кл.слова (ненормированные):
photonic crystal -- photonic band gap -- resonantly absorbing gas -- light localization
Аннотация: We show that the defect mode of photonic crystal with resonantly absorbing gas in defect is splitted due to effects of linear absorption and dispersion of resonant atoms. The splitting and shape of the lines is very sensitive to an incidence-angle of radiation on PC. The cases of one and two defects are considered.

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Доп.точки доступа:
Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Myslivets, S. A.; Мысливец, Сергей Александрович; Timofeev, I. V.; Тимофеев, Иван Владимирович; Shabanov, A. V.; Шабанов, Александр Васильевич; Vetrov, S. Ya.; Ветров, Степан Яковлевич; Timofeev, V. P.; Vetrov, S. Y. \ed.\; International Conference on Laser and Fiber-Optical Networks Modeling (8 ; 2006 ; Jun 29-Jul 01 ; Kharkiv)
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    Analytic gradient for the adaptive frozen orbital bond detachment in the fragment molecular orbital method / D. G. Fedorov [et al.] // Chem. Phys. Lett. - 2009. - Vol. 477, Is. 1-3. - P. 169-175, DOI 10.1016/j.cplett.2009.06.072. - Cited Reference Count: 49. - Гранты: We thank Professor M. Suenaga of Kyushu University for continuing his development of the modeling software FACIO and its FMO interface. D. G. F. and K. K. were supported by the a Grant-in- Aid for Scientific Research (JSPS, Japan) and the Next Generation SuperComputing Project, Nanoscience Program (MEXT, Japan). J.H.J. was supported by a Skou Fellowship from the Danish Research Agency (Forskningsradet for Natur og Univers). - Финансирующая организация: JSPS, Japan; Next Generation SuperComputing Project; MEXT, Japan; Danish Research Agency . - JUL 28. - ISSN 0009-2614
Рубрики:
DENSITY-FUNCTIONAL THEORY
   GEOMETRY OPTIMIZATIONS
   SEMICONDUCTOR NANOWIRES
   SILICON NANOWIRES
   METHOD FMO
   ENERGY
   SURFACES
   RECONSTRUCTION
   CHEMISTRY
   PROTEINS
Кл.слова (ненормированные):
Energy gradients -- Fragment molecular orbital methods -- Future applications -- Geometry optimization -- Numerical criteria -- Silicon Nanowires -- Molecular modeling -- Molecular orbitals
Аннотация: We have developed and implemented the analytic energy gradient for the bond detachment scheme in the fragment molecular orbital method (FMO) suitable to describe solids, and applied it to the geometry optimization of a silicon nanowire at several levels of theory. In addition, we have examined in detail the effects of the particular choice of the fragmentation upon the accuracy and introduced a number of numerical criteria to characterize the errors. The established route is expected to provide guidance for future applications of FMO to surfaces, solids and nanosystems. (C) 2009 Elsevier B. V. All rights reserved.

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Держатели документа:
Natl Inst Adv Ind Sci & Technol, RICS, Tsukuba, Ibaraki 3058568, Japan
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Univ Copenhagen, Dept Chem, DK-2100 Copenhagen, Denmark
Kyoto Univ, Grad Sch Pharmaceut Sci, Sakyo Ku, Kyoto 6068501, Japan

Доп.точки доступа:
Fedorov, D.G.; Kitaura, K.; Avramov, P. V.; Аврамов, Павел Вениаминович; Jensen, J.H.
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Fedorov, A. S.
Modeling of fullerens formation in carbon contained plasma / A. S. Fedorov, P. V. Novikov, G. N. Churilov // Workshop "Trends in Nanomechanics and Nanoengineering" : book of abstracts / предс. сем. K. S. Aleksandrov ; зам. предс. сем.: G. S. Patrin, S. G. Ovchinnikov ; чл. лок. ком.: N. N. Kosyrev, A. S. Fedorov [et al]. - 2009. - P. 15

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Доп.точки доступа:
Aleksandrov, K. S. \предс. сем.\; Александров, Кирилл Сергеевич; Patrin, G. S. \зам. предс. сем.\; Патрин, Геннадий Семёнович; Ovchinnikov, S. G. \зам. предс. сем.\; Овчинников, Сергей Геннадьевич; Kosyrev, N. N. \чл. лок. ком.\; Косырев, Николай Николаевич; Fedorov, A. S. \чл. лок. ком.\; Федоров, Александр Семенович; Novikov, P. V.; Churilov, G. N.; Чурилов, Григорий Николаевич; "Trends in Nanomechanics and Nanoengineering", workshop(2009 ; Aug. ; 24-28 ; Krasnoyarsk); Сибирский федеральный университет; Институт физики им. Л.В. Киренского Сибирского отделения РАН
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New carbon materials: modeling nanotube-graphene nanoribbons composites [Text] / L. A. Chernozatonskii, E. F. Sheka [et al.] // 9th Biennial International Workshop "Fullerenes and Atomic Clusters" (IWFAC 2009) : July 6-10, 2009, St Petersburg, Russia : abstracts. - 2009. - Ст. P2.4. - P75

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Доп.точки доступа:
Chernozatonskii, L.A.; Sheka, E.F.; Sorokin, P.B.; Artukh, A.A.; "Fullerenes and Atomic Clusters", Biennial International Workshop(9 ; 2009 ; JUL)
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L-Band Emission of Rough Soil Surface Covered with a Grass Litter Layer In cluding a Moisture Gradient: Comparison Between Experimental Data and a Numerical Modeling Approach [Text] / H. Lawrence, F. Demontoux [et al.] // 3rd International Symposium Recent Advances in Quantitative Remote Sensing. - 2010

Доп.точки доступа:
Lawrence, H.; Demontoux, F.; Wigneron, J; Mialon, A.; Duffour, C.; Kruszewski, A.; Mironov, V.; Kosolapova, L.; Kerr, Y.; International Symposium Recent Advances in Quantitative Remote Sensing(3 ; 2010 ; 27 Sept. to 1 Oct. ; Torrent (Valencia), Spain)
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10.

L-Band Emission of Rough Surfaces: Comparison between Ex perimental Data and Different Modeling Approaches / Lawrence, H.Demontoux, F. [et al.] // 11th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment, MicroRad 2010 : Proceedings. - 2010. - P27–32

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Держатели документа:
Лаборатория радиофизики дистанционного зондирования Института физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Lawrence, H.; Demontoux, F.; Wigneron, J.-P.; Mialon, A.; Tzong-Dar, Wu.; Mironov, V. L.; Миронов, Валерий Леонидович; Liang, Chen; Jianchen, Shi; Kerr, Y; Microwave Radiometry and Remote Sensing of the Environment, specialist Meeting on(11 ; 2011 ; март ; 5-9 ; Rome)
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