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Аврамов, Павел Вениаминович.
Механизмы неупругого рассеяния низкоэнергетических протонов на молекулах C6H6, C60, C6F12 и C60F48 / П. В. Аврамов, Б. И. Якобсон, Г. Е. Скуцерия // Физ. тверд. тела. - 2006. - Т. 48, Вып. 1. - С. 164-171. - Библиогр.: 22 . - ISSN 0367-3294
Аннотация: Методами квантовой химии и неэмпирической молекулярной динамики исследованы механизмы неупругого рассеяния низкоэнергетических протонов с кинетической энергией 2-7 eV на молекулах C6H6, C6F12, C60 и C60F48. Показано, что для систем "C6H6+протон" и "C60+протон" начиная с расстояния 6 Angstrem от углеродного каркаса процесс переноса электронного заряда с ароматической молекулы на H+ происходит с вероятностью, близкой к единице, превращая H+ в атом водорода, а нейтральные молекулы C6H6 и C60 --- в катион-радикалы. Механизм взаимодействия низкоэнергетических протонов с молекулами C6F12 и C60F48 носит принципиально иной характер и может качественно рассматриваться как взаимодействие нейтральной молекулы с точечным зарядом. Кулоновское возмущение системы, возникающее за счет взаимодействия нескомпенсированного заряда протона и малликеновских зарядов атомов фтора, приводит к инверсии энергий электронных состояний, локализованных с одной стороны, на положительно заряженном ионе водорода, а с другой --- на молекулах C6F12 и C60F48, в результате чего состояние "нейтральная молекула + протон" становится основным. Это в свою очередь делает процесс переноса электронного заряда энергетически невыгодным. Квантово-химические и молекулярно-динамические расчеты различного уровня сложности показали, что для фторпроизводных ряда ароматических структур (C6F12, C60F48) барьеры проникновения протонов через углеродные шестиугольники в 2-4 раза ниже по сравнению с соответствующими материнскими системами (C6H6, C60). Этот эффект объясняется отсутствием активного pi-электронного облака у фторированных молекул. Работа частично поддержана Nanoscale Science and Engineering Initiative of the National Science Foundation, N EEC-0118007 (Rice CBEN), и Welch Foundation. PACS: 61.48.+c, 61.80.Lj

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Center for Biological and Environmental Nanotechnology, Rice University, Houston, Texas, USA
Институт физики им. Л.В. Киренского Сибирского отделения Российской академии наук, Красноярск, Россия

Доп.точки доступа:
Якобсон, Б. И.; Скуцерия, Г. Е.; Avramov, P. V.
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Atomic structure and electronic properties of beta-phase silicon nanowires / V. A. Demin [et al.] // 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. 36

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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; Demin, V. A.; Sorokin, P. B.; Avramov, P. V.; Аврамов, Павел Вениаминович; Chernozatonskii, L. A.; "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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Triple VTe2/graphene/VTe2 heterostructures as perspective magnetic tunnel junctions / L. V. Begunovich, A. V. Kuklin, M. A. Visotin [et al.] // Appl. Surf. Sci. - 2020. - Vol. 510. - Ст. 145315, DOI 10.1016/j.apsusc.2020.145315. - Cited References: 67. - This work was supported by the government contract of the Ministry of Science and Higher Education of the Russian Federation to Siberian Federal University (Grant No. 16.1455.2017/PCh ) and Russian Foundation for Basic Research , Government of Krasnoyarsk Territory , Krasnoyarsk Regional Fund of Science to the research project: “Quantum chemical modeling of Bychkov-Rashba interfaces based on transition metal compounds and nanoscaled organic fragments”. P.V.A. and A.V.K. gratefully acknowledges the financial support of National Research Foundation of Republic of Korea for support under Grant No. NRF-2017R1A2B4004440 . A.V.K. also acknowledges the US Air Force Office of Scientific Research (contract FA-9550-18-1-0032) for support. The authors would like to thank Information Technology Center, Novosibirsk State University, Institute of Computational Modelling of SB RAS, Krasnoyarsk for providing the access to supercomputer facilities, and Irkutsk Supercomputer Center of SB RAS for providing the access to HPC-cluster “Akademik V.M. Matrosov” (Irkutsk Supercomputer Center of SB RAS, Irkutsk: ISDCT SB RAS; http://hpc.icc.ru, accessed 13.05.2019 ) . - ISSN 0169-4332
Кл.слова (ненормированные):
Magnetic tunnel junction -- Vanadium ditelluride monolayer -- Transition metal dichalcogenides -- Graphene -- Density functional theory
Аннотация: New perspective 1.4 nm thick spin-polarized triple heterostructures based on graphene sandwiched between two vanadium ditelluride monolayers (VTe2/graphene/VTe2) were studied using ab initio DFT technique. Both possible trigonal prismatic (H-VTe2) and octahedral (T-VTe2) VTe2 phases were considered to design and study graphene-based heterostructures. It was shown that the interaction with graphene changes the electronic structure of 2D T-VTe2 from metallic to half-metallic, making T phase perspective to be used for magnetic tunnel junctions. The electronic subsystem of graphene fragment is slightly hole doped. Calculated tunnel magnetoresistance ratio for the favorable heterostructure configuration estimated within the Julliere model is 220%, which opens a way to use VTe2/graphene/VTe2 as prospective magnetic tunnel junction in novel spintronic nanodevices based on tunnel magnetic resistance and spin transfer torque effects.

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Держатели документа:
Siberian Federal University, 79 Svobodny Av., Krasnoyarsk, 660041, Russian Federation
Department of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Royal Institute of Technology, Stockholm, SE-10691, Sweden
Kirensky Institute of Physics SB RAS, 50-38 Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Department of Chemistry, Kyungpook National University, 80 Daehakro, Bukgu, Daegu, 41566, South Korea

Доп.точки доступа:
Begunovich, L. V.; Kuklin, A. V.; Visotin, M. A.; Высотин, Максим Александрович; Kuzubov, A. A.; Tomilin, F. N.; Томилин, Феликс Николаевич; Tarasov, A. S.; Тарасов, Антон Сергеевич; Mikhalev, Y. G.; Avramov, P. V.
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Сравнительный квантовохимический анализ электронной структуры валентных областей кластерных моделей активных центров цитохромов f и c / Т. А. Романова [и др.] // Журн. структ. химии. - 2004. - Т. 45, № 2. - С. 199-206. - Библиогр.: 12 . - ISSN 0136-7463
Аннотация: Электронную структуру кластерной модели активных центров цитохрома-с-оксидазы рассчитывали методом DFT (PBE) в базисе 6-31G. Кластерная модель была построена на основе экспериментальной PDB-структуры и включала 1105 атомов гемопротеина. Показано, что потолок валентной зоны активных центров цитохромоксидазы сформирован атомами углерода и азота порфиринового кольца гема цитохрома а3 и атомами азота и углерода участков имидазольных колец гистидинов, связанных с атомом Cu цитохрома а3. Существенный вклад в эту группу орбиталей дают d-орбитали Cu и Fe гема а3 и Fe гема а. Сделан вывод, что каталитическая активность данной структуры определяется орбиталями этих двух типов. d-Орбитали атомов Cu цитохрома а находятся по энергии существенно ниже. Высказана гипотеза, что атомы Cu цитохрома а смещают химический потенциал d-орбиталей активного центра, что приводит к более легкому принятию и отдаче электронов; это может являться решающим фактором в процессе электронного транспорта.

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Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Романова, Т. А.; Краснов, Павел Олегович; Кузубов, Александр Александрович; Kuzubov, A. A.; Аврамов, Павел Вениаминович; Avramov, P. V.
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Варганов, Сергей Александрович.
Неэмпирические расчеты эндо- и экзоэдральных комплексов фуллерена С60 с атомом Zn / С. А. Варганов, П. В. Аврамов, С. Г. Овчинников // Журн. структ. химии. - 2000. - Т. 41, № 4. - С. 839-844. - Библиогр.: 17 . - ISSN 0136-7463

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Аврамов, Павел Вениаминович; Avramov, P. V.; Овчинников, Сергей Геннадьевич; Ovchinnikov, S. G.; Varganov S.A.
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Овчинников, Сергей Геннадьевич.
Проявление эффектов сильных электронных корреляций в рентгеновских и рентгеноэлектронных спектрах меди высокотемпературных сверхпроводников / С. Г. Овчинников, П. В. Аврамов // Физ. тверд. тела. - 1995. - Т. 37, Вып. 9. - С. 2559-2567 . - ISSN 0367-3294
Аннотация: Влияние эффектов сильных электронных корреляций на рентгеноэлектронные Cu 2p- и рентгеновские CuKalpha-спектры соединений типа La2-xSrxCuO4 было изучено методом точной диагонализации кластера CuO4. Было показано, что главный пик рентгеноэлектронного 2p-спектра меди в соединении LaSrCuO4 соответствует конфигурации Cud10LL. Допирование La2CuO4, с одной стороны, приводит к появлению высокоэнергетического плеча в главном максимуме за счет расщепления конфигураций Cud10L и Cud10LL, а с другой --- к искажению формы высокоэнергетического сателлита. В процессе формирования главного максимума CuKalpha-спектра участвуют двухдырочные Cud10LL-конфигурации в промежуточном и конечном 1s- и 2p-дырочных состояниях. Допирование приводит также к появлению еще одного интенсивного коротковолнового сателлита в CuKalpha-спектре.

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Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Аврамов, Павел Вениаминович; Avramov, P. V.; Ovchinnikov, S. G.
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Unusual shift in the visible absorption spectrum of an active ctenophore photoprotein elucidated by time-dependent density functional theory / F. N. Tomilin, A. V. Rogova, L. P. Burakova [et al.] // Photochem. Photobiol. Sci. - 2021. - Vol. 20, Is. 4. - P. 559-570, DOI 10.1007/s43630-021-00039-5. - Cited References: 61. - The ab initio quantum chemical calculations were funded by RFBR and NSFC as the research project No. 19-54-53004 and RFBR research project No. 20-04-00085. The development of structural atomistic model of berovin without calcium ions generated by the I-TASSER server was funded by project 0721-2020-0033 of the Russian Ministry of Science and Education . - ISSN 1474-905X. - ISSN 1474-9092

РУБ Biochemistry & Molecular Biology + Biophysics + Chemistry, Physical

Аннотация: Active hydromedusan and ctenophore Ca2+-regulated photoproteins form complexes consisting of apoprotein and strongly non-covalently bound 2-hydroperoxycoelenterazine (an oxygenated intermediate of coelenterazine). Whereas the absorption maximum of hydromedusan photoproteins is at 460–470 nm, ctenophore photoproteins absorb at 437 nm. Finding out a physical reason for this blue shift is the main objective of this work, and, to achieve it, the whole structure of the protein–substrate complex was optimized using a linear scaling quantum–mechanical method. Electronic excitations pertinent to the spectra of the 2-hydroperoxy adduct of coelenterazine were simulated with time-dependent density functional theory. The dihedral angle of 60° of the 6-(p-hydroxy)-phenyl group relative to the imidazopyrazinone core of 2-hydroperoxycoelenterazine molecule was found to be the key factor determining the absorption of ctenophore photoproteins at 437 nm. The residues relevant to binding of the substrate and its adopting the particular rotation were also identified.

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Держатели документа:
Fed Res Ctr Krasnoyarsk Sci Ctr SB RAS, Kirensky Inst Phys SB RAS, Akademgorodok 50-38, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Svobodny 79 Pr, Krasnoyarsk 660041, Russia.
Natl Res Tomsk State Univ, Lenin Ave 36, Tomsk 634050, Russia.
Fed Res Ctr Krasnoyarsk Sci Ctr SB RAS, Photobiol Lab, Inst Biophys SB RAS, Akademgorodok 50-50, Krasnoyarsk 660036, Russia.
Kyungpook Natl Univ, 80 Daehakro, Daegu 41566, South Korea.
Natl Inst Adv Ind Sci & Technol, Res Ctr Computat Design Adv Funct Mat CD FMat, Cent 2,Umezono 1-1-1, Tsukuba, Ibaraki 3058568, Japan.

Доп.точки доступа:
Tomilin, F. N.; Томилин, Феликс Николаевич; Rogova, A. V.; Burakova, L. P.; Tchaikovskaya, O. N.; Avramov, P. V.; Fedorov, D. G.; Vysotski, E. S.; RFBRRussian Foundation for Basic Research (RFBR) [20-04-00085]; NSFCNational Natural Science Foundation of China (NSFC) [19-54-53004]; Russian Ministry of Science and EducationMinistry of Education and Science, Russian Federation [0721-2020-0033]
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    Synthesis, mass spectroscopy detection, and density functional theory investigations of the Gd endohedral complexes of C82 fullerenols / A. A. Shakirova, F. N. Tomilin, V. A. Pomogaev [et al.] // Computation. - 2021. - Vol. 9, Is. 5. - Ст. 58, DOI 10.3390/computation9050058. - Cited References: 41. - The experimental results were funded by RFBR project No. 18-29-19003 MK. The quantum chemical study was funded by project 0721-2020-0033 of the Russian Ministry of Science and Education. The collaboration and coordination of Russian and Korean teams was supported by Collaborative NRF-RFBR grant (Korean ID: NRF-2019K2A9A1A06100125; Russian ID: Project No. 19-53-51005 NIFa RFFI-Korea) and NRF 2021R1A2C1010455 grant . - ISSN 2079-3197
   Перевод заглавия: Синтез, масс-спектроскопическое определение и исследование теорией функционала плотности Gd-эндоэдральных комплексов фуллеренолов C82

РУБ Mathematics, Interdisciplinary Applications
Рубрики:
ZETA VALENCE QUALITY
   BIOLOGICAL-ACTIVITY
   BASIS-SETS
   TOXICITY
Кл.слова (ненормированные):
endohedral fullerenes -- density functional theory -- antioxidant activity -- reactive oxygen species -- magnetic resonance imaging
Аннотация: Gd endohedral complexes of C82 fullerenols were synthesized and mass spectrometry analysis of their composition was carried out. It was established that the synthesis yields a series of fullerenols Gd@C82Ox(OH)y (x = 0, 3; y = 8, 16, 24, 36, 44). The atomic and electronic structure and properties of the synthesized fullerenols were investigated using the density functional theory calculations. It was shown that the presence of endohedral gadolinium increases the reactivity of fullerenols. It is proposed that the high-spin endohedral fullerenols are promising candidates for application in magnetic resonance imaging.

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Держатели документа:
Siberian Fed Univ, Dept Biophys, Sch Engn Phys & Radio Elect, Sch Petr & Gas Engn, Pr Svobodny 79, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk Sci Ctr, Akad Gorodok 50, Krasnoyarsk 660036, Russia.
Natl Res Tomsk State Univ, Dept Phys, Lenina Ave 36, Toms 634050, Russia.
Kyungpook Natl Univ, Dept Chem, 80 Daehak Ro, Daegu 41566, South Korea.
Kyungpook Natl Univ, Green Nano Mat Res Ctr, 80 Daehak Ro, Daegu 41566, South Korea.
Russian Acad Sci, Siberian Branch, Inst Biophys, Krasnoyarsk Sci Ctr, Akad Gorodok 50-50, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Shakirova, A. A.; Tomilin, F. N.; Томилин, Феликс Николаевич; Pomogaev, V. A.; Vnukova, N. G.; Внукова, Наталья Григорьевна; Churilov, G. N.; Чурилов, Григорий Николаевич; Kudryasheva, N. S.; Tchaikovskaya, O. N.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Avramov, P. V.; RFBRRussian Foundation for Basic Research (RFBR) [18-29-19003 MK]; Russian Ministry of Science and EducationMinistry of Education and Science, Russian Federation [0721-2020-0033]; Collaborative NRF-RFBR grant (Korean) [NRF-2019K2A9A1A06100125]; Collaborative NRF-RFBR grant (Russian) [19-53-51005 NIFa RFFI-Korea]; NRF [2021R1A2C1010455]
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    Thermo-dynamical contours of electronic-vibrational spectra simulated using the statistical quantum-mechanical methods [Text] / V. Pomogaev [et al.] // Theor. Chem. Acc. - 2011. - Vol. 130, is. 4-6. - P609-632, DOI 10.1007/s00214-011-0936-6. - Cited Reference Count: 112. - Гранты: We would like to acknowledge scientific discussions with the following collaborators and friends: Daniel Chipman, Victor Ya. Artyukhov for common discussions concerning theoretical questions and methodology; John S. Tse and Dennis D. Klug for initial discussions concerning the properties of cyanoanthracene; and Yuriko Aoki for discussions of benzene and estradiol. We would also like to thank the following funding agencies and institutions for supporting this work during its various stages of development: Kyushu University, Japan; Steacie Institute for Molecular Sciences, Canada; University of Notre Dame, USA; Siberian Physical-Technical Institute, Russia; Siberian Federal University, Russia; Kirensky Institute of Physics, Russia. We would like to thank FAPESP for project 16782-2/2009 which allowed Prof. Jalkanen to visit LEVB at UniVaP for the period from June 2010 to May 2011 from the Quantum Protein (QuP) Center at the Technical University in Denmark during which time this work was completed. - Финансирующая организация: Kyushu University, Japan; Steacie Institute for Molecular Sciences, Canada; University of Notre Dame, USA; Siberian Physical-Technical Institute, Russia; Siberian Federal University, Russia; Kirensky Institute of Physics, Russia . - DEC. - ISSN 1432-881X
Рубрики:
DENSITY-FUNCTIONAL THEORY
   INITIO MOLECULAR-DYNAMICS
   CIRCULAR-DICHROISM SPECTRA
   LASER-INDUCED FLUORESCENCE
   NUCLEAR SHIELDING TENSORS
   ALANINE N'-METHYLAMIDE
   ALKALINE-EARTH DIMERS
   ABSORPTION-SPECTRA
   HYDRATED ELECTRON
   AQUEOUS-SOLUTION
Кл.слова (ненормированные):
organic compounds -- molecular dynamics -- photophysical properties -- electronic spectra -- electronic spectra -- molecular dynamics -- organic compounds -- photophysical properties
Аннотация: Three polycyclic organic molecules in various solvents focused on thermo-dynamical aspects were theoretically investigated using the recently developed statistical quantum mechanical/classical molecular dynamics method for simulating electronic-vibrational spectra. The absorption bands of estradiol, benzene, and cyanoanthracene have been simulated, and most notably, the increase in the spectral intensity for the lowest excited state transition as the temperature is increased observed experimentally is well reproduced. In addition, this method has been extended to treat luminescent processes also, and it is seen that the experimental emission spectrum of cyanoanthracene is also well described. The method still needs further refinement, but results to date, including those presented in this work, document clearly that our model is one which is able to treat the many complex effects that the environment have on electronic absorption and emission spectra.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Univ Notre Dame, Notre Dame Radiat Lab, Notre Dame, IN 46556 USA
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Univ Vale Paraiba, Lab Biomed Vibrat Spectrscopy, Inst Res & Dev, BR-12244000 Sao Paulo, Brazil
Tech Univ Denmark, Dept Phys, Quantum Prot QuP Ctr, DK-2800 Lyngby, Denmark

Доп.точки доступа:
Pomogaev, V.; Avramov, P. V.; Аврамов, Павел Вениаминович; Kachin, S.; Pomogaeva, A.; Jalkanen, K. J.
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10.

Theoretical DFT interpretation of infrared spectra of biologically active arabinogalactan sulphated derivatives / A. S. Kazachenko, F. N. Tomilin, A. A. Pozdnyakova [et al.] // Chem. Pap. - 2020. - Vol. 74, Is. 11. - P. 4103-4113, DOI 10.1007/s11696-020-01220-3. - Cited References: 52. - The reported work was funded by RFBR and the government of Krasnoyarsk region according to the research project. 18-43-242003. The study was carried out using equipment of the Krasnoyarsk Regional Center of Research Equipment, Federal Research Center "Krasnoyarsk Science Center SB RAS". Publication was also partially supported by Project FSWM-2020-0033 of Russian Ministry of Science and Education.The authors are grateful to I.V. Korolkova for IR-spectra. . - ISSN 2585-7290. - ISSN 1336-9075

РУБ Chemistry, Multidisciplinary
Рубрики:
DENSITY-FUNCTIONAL THEORIES
ASTRAGALUS POLYSACCHARIDE
ANTICOAGULANT
Кл.слова (ненормированные):
Arabinogalactan -- Sulphated arabinogalactan -- FTIR-spectra -- Molecular structure -- Density functional theory
Аннотация: Arabinogalactan (AG) and sulphated arabinogalactans which are products of chemical modification of arabinogalactan polysaccharide with anticoagulant properties were studied by experimental infrared (IR) spectroscopy combined with density functional theory simulations. Mutual analysis of experimental and theoretical IR frequencies indicates that the discrepancies between experiment and theory is caused by the influence of –OH groups, which led to the energy shift and broadening of the absorption IR bands. It was found that theoretical and experimental spectra correspond well within the 3000–4000 cm−1 spectral region. Addition of sulphur group in AG structure causes hydroxyl group to become accessible for further sulphation. The difference between experimental and theoretical IR frequencies of sulphated AG derivatives is greater than that of the parent arabinogalactan due to the increase in the number of possible isomers and conformers.

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Держатели документа:
FRC Krasnoyarsk Sci Ctr SB RAS, Inst Chem & Chem Technol SB RAS, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, 79 Svobodny Pr, Krasnoyarsk 660041, Russia.
FRC Krasnoyarsk Sci Ctr SB RAS, Kirensky Inst Phys SB RAS, 50-38 Akademgorodok, Krasnoyarsk 660036, Russia.
Natl Res Tomsk State Univ, Lenin Ave 36, Tomsk 634050, Russia.
Kyungpook Natl Univ, Dept Chem, 80 Daehak Ro, Daegu 41566, South Korea.
Kyungpook Natl Univ, Green Nano Mat Res Ctr, 80 Daehak Ro, Daegu 41566, South Korea.

Доп.точки доступа:
Kazachenko, Aleksandr S.; Tomilin, F. N.; Томилин, Феликс Николаевич; Pozdnyakova, Anastasia A.; Vasilyeva, Natalia Yu; Malyar, Yuriy N.; Kuznetsova, Svetlana A.; Avramov, P. V.; Аврамов, Павел Вениаминович; RFBRRussian Foundation for Basic Research (RFBR); government of Krasnoyarsk region [18-43-242003]; Russian Ministry of Science and EducationMinistry of Education and Science, Russian Federation [FSWM-2020-0033]
}
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11.

    Potential energy surfaces of adsorption and migration of transition metal atoms on nanoporus materials: The case of nanoporus bigraphene and G-C3N4 / I. Melchakova, K. M. Nikolaeva, E. A. Kovaleva [et al.] // Appl. Surf. Sci. - 2021. - Vol. 540. - Ст. 148223, DOI 10.1016/j.apsusc.2020.148223. - Cited References: 39. - The authors would like to thank Joint Supercomputer Center of RAS, Moscow; Center of Equipment for Joint Use of Siberian Federal University, Krasnoyarsk; and Information Technology Centre, Novosibirsk State University for providing the access to their supercomputers. Publication was supported by Project FSWM-2020-0033 of Russian Ministry of Science and Education . - ISSN 0169-4332
   Перевод заглавия: Поверхностная потенциальная энергия адсорбции и миграции атомов переходных металлов на нанопористых материалах: случай нанопористого биграфена и G-C3N4
Кл.слова (ненормированные):
Bigraphene -- g-C3N4 -- Transition metal -- Adsorption -- Migration
Аннотация: First-row transition metal (TM) atoms adsorption and migration on nanoporus 2D materials like bigraphene with double vacancies and g-C3N4 as the active sites for TM nanocluster's growth was studied within the framework of density functional theory. Both thermodynamic and kinetic aspects of composite synthesis were discussed. It was found that potential barriers of adatom's migration from bigraphene's outer surface to the interlayer space through the double vacancy are rather low values. High potential barriers of TM migration along the carbon plane prevents TM clusterization due to enhanced chemical activity of double vacancies which gives a possibility to capture the surface adatoms. As was shown for the monolayer graphene, the decrease of vacancies concentration reduces the barrier of adatom migration along the surface while the second graphene sheet in bigraphene stabilizes the structure. The behavior of TM-atom regarding g-CN2 and g-CN1 nanosheets was investigated. Potential energy surfaces were obtained and discussed. The migration barriers were found surmountable that means high probability of migration of TM adatoms to global minima and formation of TM vacancies. Comparison of barriers values with Boltzmann factor demonstrated that just standalone temperature fluctuations cannot initiate structural transitions. The properties of designed structures can be of interest of catalysts and biosensors for biomedical applications.

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Держатели документа:
Kyungpook National University, 80 Daehakro, Bukgu, Daegu, 41566, South Korea
Siberian Federal University, 79 Svobodny Pr., Krasnoyarsk, 660041, Russian Federation
Tomsk State University, 36 Lenin Ave., Tomsk, 634050, Russian Federation
Kirensky Institute of Physics, FRC KSC SB RAS, 50 Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Melchakova, I.; Nikolaeva, K. M.; Kovaleva, E. A.; Tomilin, F. N.; Томилин, Феликс Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Tchaikovskaya, O. N.; Avramov, P. V.; Kuzubov, A. A.
}
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12.

The FeIV-O• oxyl unit as a key intermediate in water oxidation on the FeIII-hydroxide: DFT predictions / A. A. Shubin, V. Y. Kovalskii, S. P. Ruzankin [et al.] // Int. J. Quantum Chem. - 2021. - Vol. 121, Is. 10. - Ст. e26610, DOI 10.1002/qua.26610. - Cited References: 21. - Aleksandr A. Shubin, Igor L. Zilberberg, and Valentin N. Parmon acknowledge the support of Russian Foundation for Basic Research under grant No. 15-29-01275. Viktor Yu. Kovalskii acknowledges the support of Russian Foundation for Basic Research under grant No. 18-33-00932. Calculations have been performed at the Siberian Supercomputer Centre SB RAS . - ISSN 0020-7608
Кл.слова (ненормированные):
negative spin density -- oxyl oxygen -- the FeOOH hydroxide -- the O-O coupling -- water oxidation
Аннотация: The O-O coupling process in water oxidation on the gamma FeOOH hydroxide catalyst is simulated by means of density functional theory using model iron cubane cluster Fe4O4(OH)4. A key reactive intermediate is proposed to be the HO-FeIV-O• oxyl unit with terminal oxo radical. The “initial” vertex FeIII(OH) moiety forms this intermediate at the calculated overpotential of 0.93 V by adding one water molecule and withdrawing two proton–electron pairs. The O-O coupling goes via water nucleophilic attack on the oxyl oxygen to form the O-O bond with a remarkably low barrier of 11 kcal/mol. This process is far more effective than alternative scenario based on direct interaction of two ferryl FeIV-O sites (with estimated barrier of 36 kcal/mol) and is comparable with the coupling between terminal oxo center and three-coordinated lattice oxo center (12 kcal/mol barrier). The process of hydroxylation of terminal oxygen inhibits the O-O coupling. Nevertheless, being more effective for ferryl oxygen, the hydroxylation in fact enhances selectivity of the O-O coupling initiated by the oxyl oxygen.

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Держатели документа:
Boreskov Institute of Catalysis, Novosibirsk, Russian Federation
Novosibirsk State University, Novosibirsk, Russian Federation
Kirensky Institute of Physics SB RAS, FRC “Krasnoyarsk Science Center SB RAS”, Krasnoyarsk, Russian Federation
National Research Tomsk State University, Tomsk, Russian Federation
Department of Chemistry, Kyungpook National University, Daegu, South Korea

Доп.точки доступа:
Shubin, A. A.; Kovalskii, V. Y.; Ruzankin, S. P.; Zilberberg, I. L.; Parmon, V. N.; Tomilin, F. N.; Томилин, Феликс Николаевич; Avramov, P. V.
}
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13.

Романова, Т. А.
Структура валентной области кластерной модели активных центров цитохром-с-оксидазы / Т. А. Романова, П. В. Аврамов // Журн. структ. химии. - 2005. - Т. 46, № 2. - С. 351-354. - Библиогр.: 7 . - ISSN 0136-7463
Аннотация: Электронную структуру кластерной модели активных центров цитохрома-с-оксидазы рассчитывали методом DFT (PBE) в базисе 6-31G. Кластерная модель была построена на основе экспериментальной PDB-структуры и включала 1105 атомов гемопротеина. Показано, что потолок валентной зоны активных центров цитохромоксидазы сформирован атомами углерода и азота порфиринового кольца гема цитохрома а3 и атомами азота и углерода участков имидазольных колец гистидинов, связанных с атомом Cu цитохрома а3. Существенный вклад в эту группу орбиталей дают d-орбитали Cu и Fe гема а3 и Fe гема а. Сделан вывод, что каталитическая активность данной структуры определяется орбиталями этих двух типов. d-Орбитали атомов Cu цитохрома а находятся по энергии существенно ниже. Высказана гипотеза, что атомы Cu цитохрома а смещают химический потенциал d-орбиталей активного центра, что приводит к более легкому принятию и отдаче электронов; это может являться решающим фактором в процессе электронного транспорта.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Аврамов, Павел Вениаминович; Avramov, P. V.
}
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14.

Avramov, P. V.
Influence of strong electron correlations on the form of the x-ray Cu K absorption spectra of La2-xSrxCuO4 / P. V. Avramov, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2011. - Vol. 81, Is. 4. - P. 811-816. - Cited References: 24. - We thank the Scientific Council for the Problem of HighTemperature Superconductivity for support under Project . - ISSN 1063-7761
Аннотация: The influence of strong electron correlations on the x-ray Cu K absorption spectra has been investigated using the extended p-d model and the sudden approximation. The structure of the vacant above-threshold single-electron Cu p states has been modeled by the SCF X, scattered wave method. It has been shown that the Cu K spectrum is determined by a convolution of the spectra of single-electron absorption by vacant orbitals below and above the ionization threshold and of many-electron transitions within the system of valence electrons. This makes it possible to attribute the main peak of the Cu K spectrum of La2Cu04 to the Cu dlOL configuration and the single high-energy satellite to the Cu d9 configuration. The LaSrCu04 spectrum has been calculated with allowance for both singlet and triplet two-hole states of the CuO, cell. Comparison with experimental data reveals that the main two-hole state is a triplet, which also forms the absorption spectrum consisting of the main maximum corresponding to the Cu ~'OLL configuration and two satellites corresponding to the Cu d9L and Cu d8 configurations. All the theoretical spectra obtained agree well with the experimental data. O 1995 American Institute of Physics.

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Публикация на русском языке Аврамов, Павел Вениаминович. Влияние эффектов сильных электронных корреляций на форму рентгеновских CuK-спектров поглощения La_2-xSr_x CuO_4 [Текст] / П. В. Аврамов, С. Г. Овчинников // Журн. эксперим. и теор. физ. - 1995. - Т. 108 Вып. 4. - С. 1479-1488

Держатели документа:
[Ovchinnikov, S. G.
Makarov, I. A.
Shneyder, E. I.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.
Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
}
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15.

A key role of tensile strain and surface termination in formation and properties of La0.7Sr0.3MnO3 composites with carbon nanotubes / E. A. Kovaleva [et al.] // Comput. Mater. Sci. - 2017. - Vol. 139. - P. 125-131, DOI 10.1016/j.commatsci.2017.07.021. - Cited References: 39. - This work was supported by National Research Foundation of Republic of Korea under Grant No. NRF-2017R1A2B4004440 and the government contract of the Ministry of Education and Science of the Russian Federation to Siberian Federal University (Grant No. 16.1455.2017/PCh). The authors would like to thank Joint Supercomputer Center of RAS, Moscow; Center of Equipment for Joint Use of Siberian Federal University, Krasnoyarsk; and Information Technology Centre, Novosibirsk State University for providing the access to their supercomputers. P.B.S gratefully acknowledges the financial supports of the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST «MISiS» (No. К2-2017-001) and RFBR, according to the research project No. 16-32-60138 mol_a_dk. E.A. Kovaleva would also like to acknowledge the program of the President of Russian Federation for Leading Scientific Schools Support (Grant No. 2016 NSh-7559.2016.2). . - ISSN 0927-0256
Кл.слова (ненормированные):
Carbon nanotubes -- LSMO -- Interface -- Spin polarization
Аннотация: Atomic and electronic structure of LSMO-based composites with carbon nanotubes were studied by means of density functional theory with respect to the termination of LSMO surface. The deformation of the tubes caused by the lattice mismatch with the substrate leads to a major change in their electronic structure. The surface terminated with Mn-O layer provides much stronger interaction with carbon nanotubes than Sr-O terminated one does. The interaction with transition metal atoms is essential for spin polarization of the nanotube while no spin injection was observed for Sr-O-supported tubes. © 2017 Elsevier B.V.

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Держатели документа:
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation
L.V. Kirensky Institute of Physics, 50 Akademgorodok, Krasnoyarsk, Russian Federation
Kyungpook National University, 80 Daehakro, Bukgu, Daegu, South Korea
National University of Science and Technology MISiS, 4 Leninskiy prospekt, Moscow, Russian Federation

Доп.точки доступа:
Kovaleva, E. A.; Kuzubov, A. A.; Кузубов, Александр Александрович; Avramov, P. V.; Kholtobina, A. S.; Kuklin, A. V.; Куклин, Артем Валентинович; Tomilin, F. N.; Томилин, Феликс Николаевич; Sorokin, P. B.
}
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16.

The direct exchange mechanism of induced spin polarization of low-dimensional π-conjugated carbon- and h-BN fragments at LSMO(001) MnO-terminated interfaces / A. V. Kuklin [et al.] // J. Magn. Magn. Mater. - 2017. - Vol. 440: EURO-Asian Symposium on Trends in Magnetism (EASTMAG) (AUG 15-19, 2016, Siberian Fed Univ, Krasnoyarsk, RUSSIA). - P. 23-29, DOI 10.1016/j.jmmm.2016.12.096. - Cited References:70. - We acknowledge the Siberian Supercomputer Center (SSCC) of SB RAS, Novosibirsk; the Joint Supercomputer Center of RAS, Moscow and the ICC of Novosibirsk State University for providing the computing resources. Russian Science Foundation (Grant No 14-13-00139) supported the work of Russian team. . - ISSN 0304-8853. - ISSN 1873-4766

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
HEXAGONAL BORON-NITRIDE
   THIN-FILMS
   GIANT MAGNETORESISTANCE
   METALLIC
Кл.слова (ненормированные):
Graphene nanoribbons -- DFT -- LSMO thin films -- Induced spin polarization -- h-BN nanoribbons -- Half-metal
Аннотация: Induced spin polarization of π-conjugated carbon and h-BN low dimensional fragments at the interfaces formed by deposition of pentacene molecule and narrow zigzag graphene and h-BN nanoribbons on MnO2-terminated LSMO(001) thin film was studied using GGA PBE+U PAW D3-corrected approach. Induced spin polarization of π-conjugated low-dimensional fragments is caused by direct exchange with Mn ions of LSMO(001) MnO-derived surface. Due to direct exchange, the pentacene molecule changes its diamagnetic narrow-band gap semiconducting nature to the ferromagnetic semiconducting state with 0.15 eV energy shift between spin-up and spin-down valence bands and total magnetic moment of 0.11 μB. Direct exchange converts graphene nanoribbon to 100% spin-polarized half-metal with large amplitude of spin-up electronic density at the Fermi level. The direct exchange narrows the h-BN nanoribbon band gap from 4.04 to 1.72 eV in spin-up channel and converts the h-BN ribbon semiconducting diamagnetic nature to a semiconducting magnetic one. The electronic structure calculations demonstrate a possibility to control the spin properties of low-dimensional π-conjugated carbon and h-BN fragments by direct exchange with MnO-derived LSMO(001) surface for spin-related applications.

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Доп.точки доступа:
Kuklin, A. V.; Kuzubov, A. A.; Кузубов, Александр Александрович; Kovaleva, E. A.; Ковалева, Евгения Андреевна; Lee, Hyosun; Sorokin, Pavel B.; Sakai, Seiji; Entani, Shiro; Naramoto, Hiroshi; Avramov, P. V.; Аврамов, Павел Вениаминович; Russian Science Foundation [14-13-00139]; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН
}
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17.

Two-dimensional hexagonal CrN with promising magnetic and optical properties: A theoretical prediction / A. V. Kuklin [et al.] // Nanoscale. - 2017. - Vol. 9, Is. 2. - P. 621-630, DOI 10.1039/c6nr07790k. - Cited References: 76. - We acknowledge the Siberian Supercomputer Center (SSCC) of SB RAS, Novosibirsk; the Institute of Computational Modeling of SB RAS, Krasnoyarsk; the Joint Supercomputer Center of RAS, Moscow; and the ICC of Novosibirsk State University for providing the computing resources. This work was supported by the government contract of the Ministry of Education and Science of the Russian Federation to Siberian Federal University (Grant No. 16.1500.2014/K). P. V. A. acknowledges the Kyungpook National University Research Fund, 2014. N. S. M. acknowledges the Russian Foundation for Basic Research (RFBR 16-32-60003 mol_a_dk). . - ISSN 2040-3364
Кл.слова (ненормированные):
Boron nitride -- Calculations -- Energy gap -- Ferromagnetic materials -- Ferromagnetism -- Graphene -- Magnetism -- Metals -- Transition metals -- Transparency -- Dielectric functions -- Ferromagnetic orderings -- First-principles calculation -- Half-metallic properties -- Magnetic and optical properties -- Optical transparency -- Spintronics application -- Transition metal dichalcogenides -- Optical properties
Аннотация: Half-metallic ferromagnetic materials with planar forms are promising for spintronics applications. A wide range of 2D lattices like graphene, h-BN, transition metal dichalcogenides, etc. are non-magnetic or weakly magnetic. Using first principles calculations, the existence of graphene-like hexagonal chromium nitride (h-CrN) with an almost flat atomically thin structure is predicted. We find that freestanding h-CrN has a 100% spin-polarized half-metallic nature with possible ferromagnetic ordering and a high rate of optical transparency. As a possible method for stabilization and synthesis, deposition of h-CrN on 2D MoSe2 or on MoS2 is proposed. The formation of composites retains the half-metallic properties and leads to the reduction of spin-down band gaps to 1.43 and 1.71 eV for energetically favorable h-CrN/MoSe2 and h-CrN/MoS2 configurations, respectively. Calculation of the dielectric functions of h-CrN, h-CrN/MoSe2 and h-CrN/MoS2 exhibit the high transparency of all three low-dimensional nanomaterials. The honeycomb CrN may be considered as a promising fundamental 2D material for a variety of potential applications of critical importance. © The Royal Society of Chemistry 2017.

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Держатели документа:
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russian Federation
Department of Chemistry, Kyungpook National University, 80 Daehakro Bukgu, Daegu, South Korea
L.V. Kirensky Institute of Physics, 50/38 Akademgorodok, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Kuklin, A. V.; Куклин, Артем Валентинович; Kuzubov, A. A.; Кузубов, Александр Александрович; Kovaleva, E. A.; Mikhaleva, N. S.; Tomilin, F. N.; Томилин, Феликс Николаевич; Lee, H.; Avramov, P. V.
}
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18.

Theoretical investigation of the interfaces and mechanisms of induced spin polarization of 1D narrow zigzag graphene- and h-BN nanoribbons on a SrO-terminated LSMO(001) surface / P. Avramov [et al.] // J. Phys. Chem. A. - 2017. - Vol. 121, Is. 3. - P. 680-689, DOI 10.1021/acs.jpca.6b09696. - Cited References:74. - We acknowledge the Siberian Supercomputer Center (SSCC) of SB RAS, Novosibirsk; the Joint Supercomputer Center of RAS, Moscow; and the ICC of Novosibirsk State University for providing the computing resources. P.B.S. acknowledges the financial support of the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST MISiS (No. K2-2015-033). The Russian Science Foundation (Grant No 14-13-00139) supported the work of the Russian team. The Japanese Science Foundation (JSPS KAKENHI, Grant No 16H3875) supported the work of the Japanese team. . - ISSN 1089-5639

РУБ Chemistry, Physical + Physics, Atomic, Molecular & Chemical
Рубрики:
HEXAGONAL BORON-NITRIDE
AUGMENTED-WAVE METHOD
GIANT MAGNETORESISTANCE
Аннотация: The structure of the interfaces and the mechanisms of induced spin polarization of 1D infinite and finite narrow graphene- and h-BN zigzag nanoribbons placed on a SrO-terminated La1-xSrxMnO3 (LSMO) (001) surface were studied using density functional theory (DFT) electronic structure calculations. It was found that the pi-conjugated nanofragments are bonded to the LSMO(001) surface by weak disperse interactions. The types of coordination of the fragments, the strength of bonding, and the rate of spin polarization depend upon the nature of the fragments. Infinite and finite graphene narrow zigzag nanoribbons are characterized by the lift of the spin degeneracy and strong spin polarization caused by interface-induced structural asymmetry and oxygen-mediated indirect exchange interactions with Mn ions of LSMO support. Spin polarization changes the semiconducting nature of infinite graphene nanoribbons to half-metallic state with visible spin-up density of states at the Fermi level. The h-BN nanoribbon binding energy is weaker than graphene nanoribbon ones with noticeably shorter interlayer distance. The asymmetry effect and indirect exchange interactions cause spin polarization of h-BN nanoribbon as well with formation of embedded states inside the band gap. The results show a possibility to use one-atom thick nanofragments to design LSMO-based heterostructures for spintronic nanodevices with h-BN as an inert spacer to develop different potential barriers.

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Держатели документа:
Kyungpook Natl Univ, Dept Chem, 80 Daehak Ro, Daegu 41566, South Korea.
Kyungpook Natl Univ, Green Nano Mat Res Ctr, 80 Daehak Ro, Daegu 41566, South Korea.
Siberian Fed Univ, 79 Svobodniy Pr, Krasnoyarsk 660041, Russia.
LV Kirensky Inst Phys SB RAS, 50-38 Akademgorodok, Krasnoyarsk 660036, Russia.
Natl Inst Quantum & Radiol Sci & Technol QST, Naka, Ibaraki 3191106, Japan.
Natl Univ Sci & Technol MISiS, Moscow 119049, Russia.

Доп.точки доступа:
Avramov, P. V.; Аврамов, Павел Вениаминович; Kuzubov, A. A.; Кузубов, Александр Александрович; Kuklin, A. V.; Куклин, Артем Валентинович; Lee, H.; Kovaleva, E. A.; Ковалева, Евгения Андреевна; Sakai, S.; Entani, S.; Naramoto, H.; Sorokin, P. B.; Ministry of Education and Science of the Russian Federation [K2-2015-033]; Russian Science Foundation [14-13-00139]; Japanese Science Foundation (JSPS KAKENHI) [16H3875]
}
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19.

Аврамов, Павел Вениаминович.
Влияние эффектов сильных электронных корреляций на форму рентгеновских CuK-спектров поглощения La_2-xSr_x CuO_4 / П. В. Аврамов, С. Г. Овчинников // Журн. эксперим. и теор. физ. - 1995. - Т. 108, Вып. 4. - С. 1479-1488 . - ISSN 0044-4510

Переводная версия Avramov P. V. Influence of strong electron correlations on the form of the x-ray Cu K absorption spectra of La2-xSrxCuO4 [Текст] / P. V. Avramov, S. G. Ovchinnikov // J. Exp. Theor. Phys. - 2011. - Vol. 81 Is. 4.- P.811-816

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Овчинников, Сергей Геннадьевич; Ovchinnikov, S. G.; Avramov, P. V.
}
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20.

Avramov, P. V.
The role of interfaces in determination of electronic properties of complex silicon nanoclusters / P. V. Avramov // 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. 11

Материалы семинара

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; Аврамов, Павел Вениаминович; "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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