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    Подопригора, Владимир Георгиевич.
    Определение характеристик поверхности диэлектрических пластин с помощью рассеяния света / В. Г. Подопригора, С. А. Раковская // Международ. журн. прикл. и фундамент. исслед. - 2023. - № 6. - С. 59-62, DOI 10.17513/mjpfi.13554. - Библиогр.: 5 . - ISSN 1996-3955
   Перевод заглавия: Determination of plates dielectrical surfaces charakteristics by light scatlering
Кл.слова (ненормированные):
неровность поверхности -- шероховатость -- сверхгладкие пластины -- корреляционная функция -- индикатриса рассеяния -- roughness parameters -- surface -- correlation function -- dielectrical plates -- scattering indicatrix
Аннотация: В работе предложен новый способ определения параметров шероховатостей и корреляционной функции (КФ) сверхгладких диэлектрических пластин. Способ основан на нахождении из экспериментальной индикатрисы рассеивания света коэффициентов разложения (КФ) в ряд по системе ортогональных функций с последующим вычислением среднеквадратичных отклонений высот неровностей поверхности σ и периода корреляции Т. Отличительными особенностями метода являются: 1) отсутствие неоднозначности, возникающей при подгонке к экспериментальной кривой рассеяния теоретических зависимостей с разными корреляционными функциями, которые сами зависят от параметров шероховатостей; 2) возможность избежать необходимости измерять индикатрису рассеяния во всей полусфере над образцом. Данный способ определения КФ и параметров шероховатости поверхности может применяться для любого типа границ раздела при соблюдении критерия Рэлея, определяющего степень неровности поверхности отражения по отношению к длине волны падающего излучения. Поэтому объектами исследования могут быть не только поверхности с нанометровыми шероховатостями, облучаемые лазерным светом, но и, например, земные покровы при их дистанционном зондировании радиосигналами навигационных спутников. Для полированных пластин кварца получены значения параметров поверхностей, близкие к аналогичным величинам, измеренным независимо на лазерном интерференционном профилометре другими авторами.
The paper proposes a new method for determining the roughness parameters and the correlation function (CF) of supersmooth dielectric plates. The method is based on finding the expansion coefficients (CF) from the experimental light scattering indicatrix in a series according to a system of orthogonal functions, followed by the calculation of the standard deviations of the surface irregularity heights σ and the correlation period Т. Distinctive features of the method are: 1) the absence of ambiguity that arises when fitting theoretical dependences with different correlation functions, which themselves depend on the roughness parameters, to the experimental scattering curve; 2) the possibility of avoiding the need to measure the scattering indicatrix in the entire hemisphere above the sample. This method for determining the CF and surface roughness parameters can be used for any type of interface, subject to the Rayleigh criterion, which determines the degree of roughness of the reflection surface with respect to the wavelength of the incident radiation. Therefore, the objects of study can be not only surfaces with nanometer roughness irradiated by laser light, but also, for example, earth covers during their remote sensing by radio signals from navigation satellites. For polished quartz plates, the values of the surface parameters were obtained close to similar values measured independently on a laser interference profilometer by other authors.

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

Доп.точки доступа:
Раковская, С. А.; Podoprigora, V. G.
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    Подопригора, Владимир Георгиевич.
    Определение динамических и электрооптических характеристик поверхности и ультратонких молекулярных плёнок / В. Г. Подопригора // Межд. журн. прикл. и фундамент. исслед. - 2017. - № 4. Ч. 2. - 328-331. . - Библиогр.: 5 . - ISSN 1996-3955
   Перевод заглавия: Dynamic and electro-optical parameters investigation of crystal surfaces and thin molecular films
Кл.слова (ненормированные):
молекулярная электроника -- молекулярные пленки -- электрооптика -- electro-optical parameters -- surfaces layer
Аннотация: В данной работе рассчитаны динамические и электрооптические параметры решётки поверхностного слоя кристаллов парадигалоидбензолов. Используя методы атом-атомных потенциалов, Раман-рассеяния и модель пластины, исследован спектр фононов в объёме и на поверхности. Получено, что: 1) частоты решеточных колебаний уменьшаются при переходе к кристаллической поверхности; 2) решеточные колебания локализованы практически в одном-двух монослоях; 3) ориентационные и трансляционные колебания на поверхности сильно смешиваются. Локальное поле f cвязывает микро и макропараметры упорядоченной молекулярной среды. В данной работе вычислены значения тепзоров f, эффективной молекулярной поляризуемости γ, структурного фактора L, также как диэлектрической восприимчивости χ в моно и мультислоях. Анизотропия тепзоров f, γ, L и χ на поверхности в слое значительно меняется. Локальное поле индуцирует изменение макроскопичекого диэлектрического отклика кристалла и плёнки. Поэтому оптические и электрические параметры, такие как коэффициенты отражения, эллипсометрические, комбинационного рассеяния света, поверхностной проводимости – зависят от направления даже для изотропного кристалла. Результаты расчётов сравниваются с экспериментом по Раман-рассеянию и измерению коэффициентов преломления кристаллов и тонких слоёв. Хорошее согласие между данными вычисления и эксперимента позволяют надеяться на дальнейшее использование этих методов для исследования других интересных для практики объектов.
The lattice dynamics and electro-optical parameters of surfaces layer of paradihaloid-benzenes crystals have been calculated in this work. Phonon spectrum in the bulk and on the surface of the crystal is investigated using the methods of atom-atom potential, Raman scattering and slab-model. It’s found: 1) the lattice vibration frequencies decrease at the transition to the crystal surface; 2) surface vibration are localized practically in one or two surface monolayers; 3) oriental and translation vibrations are strongly mixed at the surface. The local field coefficients tensor f connects micro- and macroparameters of the ordered molecular media. In this work we calculate f tensor values, effective polaritability γ of molecules, structural factor tensor as well as the dielectric susceptibility χ of mono- and multilayers. The anisotropy of f, γ, L, χ tensors on the crystal surface and into thin film is significantly changing. Local field effect induced a change in the macroscopic dielectric response of crystal and film. Thats why the optical and electrical parameters such as a reflectance, Raman scattering, ellipsometric coefficient, surface conductivitice depend on directons even for cubical crystals. The results of calculation are compared with experimental Raman scattering and the refraction indexes for crystals and thin films. The good agreement between calculation and experiment date allow to hope on further using of this methods for the investigation other interest objects.

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Держатели документа:
Сибирский федеральный университет, Красноярск, Россия

Доп.точки доступа:
Podoprigora, V. G.
}
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Ultrafine particles in ground sulfide ores: A comparison of four Cu-Ni ores from Siberia, Russia / Y. Mikhlin [et al.] // Ore Geol. Rev. - 2017. - Vol. 81, Part 1. - P. 1-9, DOI 10.1016/j.oregeorev.2016.10.024. - Cited References: 64. - This research was supported by the Russian Science Foundation, grant no. 14-17-00280. . - ISSN 0169-1368
Кл.слова (ненормированные):
Cu-Ni sulfide ores -- Ultrafine particles -- Mineral surfaces -- Colloids -- Beneficiation -- Environment
Аннотация: Nano-, submicro- and micrometer mineral particles may have an important role in beneficiation of metal ores and environmental impact, but their origin and characteristics are poorly understood. Here, we report data for the yield and the composition of fine fractions, and surfaces of several ground Cu-Ni sulfide ores studied using laser diffraction, scanning electron microscopy and energy dispersive X-ray analysis, X-ray photoelectron spectroscopy. Colloidal particles were characterized using dynamic light scattering, zeta-potential measurement, transmission electron microscopy and electron diffraction. The production of fines by dry milling was found to increase from about 0.01 vol.% to 0.2 vol.% for submicrometer particles and from ~ 0.5 vol.% to about 1.5 vol.% for particulate material less than 5 μm in the following order: Noril'sk disseminated low sulfide ore ≤ Noril'sk Cu-rich sulfide ore < Noril'sk valleriite ore < Kingash ore. For wet milling, the yield may be several times higher. Both surfaces of the milled ores and colloids were enriched in O, Mg, Si (largely as serpentine slimes) and depleted in sulfur, basic metals and iron, but colloidal valleriite, chalcopyrite, and oxidized pyrrhotite were found in the respective supernatants too. Typically, the colloidal particles form aggregates with an average hydrodynamic diameter of about 1 μm and a smaller number of ~ 5 μm species, except for valleriite ore, which exhibits a single size distribution peak at 2.7 μm. Zeta-potential, which characterizes the electric charge of the particles and dispersion stability of colloids, changed from − 25 mV for the low sulfide ore to about 0 mV for valleriite ore, and to + 15 mV for Kingash ore. Poor flotation recovery of metal from Kingash ore and Noril'sk valleriite ore is suggested to be due to both the large quantities and positive charge of hydrophilic ultrafine serpentine and/or magnesium hydroxide minerals. Resistance to oxidation and hence stability against aggregation of copper-bearing sulfide colloids in waste waters is expected to result in a negative impact on the environment.

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Держатели документа:
Institute of Chemistry and Chemical Technology of the Siberian Branch of the Russian Academy of Sciences, Akademgorodok, 50/24, Krasnoyarsk, Russian Federation
Siberian Federal University, Svobodny pr. 79, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics of the Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Mikhlin, Y.; Romanchenko, A.; Vorobyev, S.; Karasev, S.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Kamenskiy, E.; Burdakova, E.
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    Theoretical study of elastic properties of SiC nanowires of different shapes / P. B. Sorokin [et al.] // J. Nanosci. Nanotechnol. - 2010. - Vol. 10, Is. 8. - P. 4992-4997, DOI 10.1166/jnn.2010.2424. - Cited Reference Count: 49. - Гранты: This work was partially supported by JSPS-RFBR collaborative grant 09-02-92107. The electronic structure calculations have been performed on the Joint Supercomputer Centre of the Russian Academy of Sciences. One of the authors (Pavel V. Avramov) acknowledges the encouragement of Professor K. Morokuma, research leader of Fukui Institute, Kyoto University and Dr. Alister Page for kind help and support. The geometry of all structures was visualized by ChemCraft software.SUP53/SUP. - Финансирующая организация: JSPS-RFBR [09-02-92107]; Fukui Institute, Kyoto University . - ISSN 1533-4880. - ISSN 1533-4899
Рубрики:
INITIO MOLECULAR-DYNAMICS
   SILICON-CARBIDE
   THERMAL-STABILITY
   CARBON NANOTUBES
   NANORODS
   GROWTH
   SURFACES
   NANOCRYSTALS
   POTENTIALS
   CONSTANTS
Кл.слова (ненормированные):
Silicon Carbide -- Nanowires -- Elastic Properties -- DFT -- Molecular Mechanics -- DFT -- Elastic properties -- Molecular mechanics -- Nanowires -- Silicon carbide -- Atomic structure -- Cubic phasis -- DFT -- Effective size -- Elastic properties -- SiC nanowire -- Silicon carbide nanowires -- Theoretical study -- Wire geometries -- Young's Modulus -- Crystal atomic structure -- Density functional theory -- Elastic moduli -- Elasticity -- Molecular mechanics -- Nanowires -- Wire -- Silicon carbide
Аннотация: The atomic structure and elastic properties of silicon carbide nanowires of different shapes and effective sizes were studied using density functional theory and classical molecular mechanics. Upon surface relaxation, surface reconstruction led to the splitting of the wire geometry, forming both hexagonal (surface) and cubic phases (bulk). The behavior of the pristine SiC wires under compression and stretching was studied and Young's moduli were obtained. For Y-shaped SiC nanowires the effective Young's moduli and behavior in inelastic regime were elucidated.

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Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Russian Acad Sci, Emanuel Inst Biochem Phys, Moscow 119334, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Sorokin, P.B.; Kvashnin, D.G.; Kvashnin, A.G.; Avramov, P. V.; Аврамов, Павел Вениаминович; Chernozatonskii, L.A.
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The Fermi surface and the role of electronic correlations in Sm2-xCexCuO4 / M. M. Korshunov [et al.] // J. Phys.: Condens. Matter. - 2010. - Vol. 22, Is. 1. - Ст. 15701, DOI 10.1088/0953-8984/22/1/015701. - Cited References: 35. - We would like to thank A A Kordyuk and I Eremin for useful discussions. The authors acknowledge support from RFBR (grants 08-02-00021, 10-02-00662, 08-02-91200 and 07-02-00226), the RAS programs on 'Low temperature quantum phenomena', 'Quantum physics of condensed matter' and 'Strongly correlated electrons solids', President of Russia (grants MK-614.2009.2 (IN) and MK-3227.2008.2 (ZP)), Scientific School (grant SS-1929.2008.2), Interdisciplinary UB-SB RAS project, Dynasty Foundation (ZP) and Russian Science Support Foundation (IN). . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
T-C SUPERCONDUCTOR
   IN-GAP STATES
   SPIN CORRELATIONS
   BAND
   LA2-XSRXCUO4
   EXCITATIONS
   TRANSITION
   EVOLUTION
   SM2CUO4
   OXIDES
Кл.слова (ненормированные):
Antiferromagnetics -- Doping evolution -- Electron-doped -- Electronic correlation -- Emery model -- Experimental data -- Generalized tight bindings -- High-T -- Hybrid scheme -- Magnetic orders -- Spin-liquid -- Tight binding model -- Two-regime -- Antiferromagnetism -- Cerium -- Cerium compounds -- Copper oxides -- Corundum -- Doping (additives) -- Fermi surface -- Fermions -- Tin -- Surfaces
Аннотация: Using a LDA + GTB (local density approximation + generalized tight-binding) hybrid scheme we investigate the band structure of the electron-doped high-T-c material Sm2-xCexCuO4. Parameters of the minimal tight-binding model for this system (the so-called three-band Emery model) were obtained within the NMTO (Nth-order muffin-tin orbital) method. The doping evolution of the dispersion and the Fermi surface in the presence of electronic correlations was investigated in two regimes of magnetic order: short-range (spin-liquid) and long-range (antiferromagnetic metal). Each regime is characterized by the specific topologies of the Fermi surfaces and we discuss their relation to recent experimental data.

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Держатели документа:
[Korshunov, M. M.] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[Korshunov, M. M.
Zakharova, E. V.
Ovchinnikov, S. G.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Nekrasov, I. A.] Russian Acad Sci, Inst Electrophys, Ekaterinburg 620016, Russia
[Pchelkina, Z. V.] Russian Acad Sci, Inst Met Phys, Ekaterinburg 620219, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany
L v Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Institute for Electrophysics, Russian Academy of Sciences, Ekaterinburg 620016, Russian Federation
Institute for Metal Physics, Russian Academy of Sciences, Ekaterinburg 620219, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Korshunov, M. M.; Коршунов, Максим Михайлович; Zakharova, E. V.; Nekrasov, I. A.; Pchelkina, Z. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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The effect of aluminum-oxide powders on the structure and properties of copper electrodeposited composite coatings / I. R. Volkova, L. E. Tyryshkina, M. N. Volochaev [et al.] // Prot. Met. Phys. Chem. Surf. - 2023. - Vol. 59, Is. 1. - P. 71-75, DOI 10.1134/S2070205122700022. - Cited References: 9 . - ISSN 2070-2051. - ISSN 2070-206X
Кл.слова (ненормированные):
copper electrodeposited composite coatings -- aluminum-oxide nanopowder -- alumina -- microstructure -- microhardness -- ultimate tensile strength
Аннотация: Copper electrodeposited composite coatings containing two types of aluminum-oxide powders with different dispersities (alumina Al2O3-1 and electroexplosive aluminum-oxide nanopowder Al2O3-2) are obtained during the work. The studies show that introducing the powders leads to a change in the microstructure of the composites and a change in the grain growth principles during the formation of the coatings. Refinement and ordering of the grain structure of the coatings occurs and twinning defects and texture are formed. The change in the formation of the microstructure of the composites leads to a change in some operational characteristics: an increase in the microhardness (by 10% in the composites with the addition of alumina and by more than 30% in the coatings with electroexplosive aluminum oxide) and ultimate tensile strength (by 20% in the composites with Al2O3-1 and almost 1.5-fold in the samples with Al2O3-2).

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Публикация на русском языке Влияние порошков оксида алюминия на структуру и свойства медных композиционных гальванических покрытий [Текст] / И. Р. Волкова, Л. Е. Тырышкина, М. Н. Волочаев [и др.] // Физикохим. поверхн. и защита материалов. - 2023. - Т. 59 № 1. - С. 39-44

Держатели документа:
Federal Research Center “Krasnoyarsk Science Center”, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia
Reshetnev Siberian State University of Science and Technology, 660037, Krasnoyarsk, Russia

Доп.точки доступа:
Volkova, I. R.; Tyryshkina, L. E.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Zaloga, A. N.; Shabanova, K. A.; Ovchinnikov, A. V.; Lyamkin, A. I.
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Sukhinin, Y. V.
Phase transitions in self-assembled monolayers of alkanethiols containing the polar group / Y. V. Sukhinin // J. Exp. Theor. Phys. - 1998. - Vol. 87, Is. 1. - P. 115-122, DOI 10.1134/1.558645. - Cited References: 38 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
ORGANIZED MOLECULAR ASSEMBLIES
   ALKYL THIOL MONOLAYERS
   STRUCTURAL CHARACTERIZATION
   DYNAMICS SIMULATION
   LANGMUIR MONOLAYER
   SURFACES
   GOLD
   FILMS
   AU(111)
   MODEL
Аннотация: Equilibrium states of the system of self-assembled monolayers (SAMs) of n-alkanethiol molecules HS(CH2)(n-1)(X) with polar group X chemiabsorbed on the Au(111) crystal surface are considered. The couplings between the atoms (C, H) of the n-alkanethiols are approximated by the Lennard-Jones potential. The couplings between the n-alkanethiols and the crystal surface are approximated by the 12-3 potential. The interactions of polar groups and the self-images with the metal substrate are taken into consideration. The phase-transition temperatures, the structural order and equilibrium tilt, and the twist and azimuthal angles of the macromolecules, which depend on the dipole moments, are found. (C) 1998 American Institute of Physics.

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Держатели документа:
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
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Structure Potential Energy Surfaces and Electronic States of Graphene- and Multigraphene-based 2D Extended Complex Nanocomposites / P. Avramov, S. Sakai, A. A. Kuzubov [et al.] // Joint International Conference "Advanced Carbon Nanostructures" (ACN 2011) : Abstracts. - 2011. - Ст. P1.02. - P71

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Материалы конференции

Доп.точки доступа:
Avramov, P. V.; Аврамов, Павел Вениаминович; Sakai, S.; Kuzubov, A.A.; Entani, S.; Matsumoto, Y.; Naramoto, H.; "Advanced Carbon Nanostructures", Joint International Conference(2011 ; July ; 4-8 ; St Petersburg)
}
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Sadreev, A. F.
Phase transitions in a system of CH3(CH2)(n-1) self-assembled on the Au(111) crystal surface / A. F. Sadreev, Y. V. Sukhinin // Phys. Rev. B. - 1996. - Vol. 54, Is. 24. - P. 17966-17973, DOI 10.1103/PhysRevB.54.17966. - Cited References: 44 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
ORGANIZED MOLECULAR ASSEMBLIES
   ALKYL THIOL MONOLAYERS
   STRUCTURAL CHARACTERIZATION
   DYNAMICS SIMULATION
   DEVILS STAIRCASE
   GOLD SURFACES
   FILMS
   MODEL
   CHAIN
   DIFFRACTION
Аннотация: The n-alkanethiols CH3(CH2)(n-1) on the crystal surface of gold (111) are considered. Couplings between atoms (C, H) of the n-alkanethiols were modelled by the Morse potential, and couplings between the n-alkanethiols and the crystal surface were modelled by 12-3 potentials. Because of symmetry Z(2) of the n-alkanethiols in a tilted state, the system can be reduced to the Ising model on the triangular lattice, the phase diagram of which can be explicitly considered. Depending on the choice of the coupling parameters, the ordered state of the system may form an incommensurate or 2X1 superstructure. The temperatures of the phase transition, equilibrium tilting, twisting, and azimuthal angles are found to depend on the Morse coupling constants.

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Доп.точки доступа:
Sukhinin, Y. V.; Садреев, Алмаз Фаттахович
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10.

Pyatnov, M. V.
Controlled photonic surface modes in 'cholesteric liquid crystal - Phase plate - Metal' structure / M. V. Pyatnov, S. Ya. Vetrov, I. V. Timofeev // Progress in Electromagnetics Research Symposium : Proceedings. - 2015. - Vol. 2015-January. - P. 224-227 . - ISBN 9781934142301
Кл.слова (ненормированные):
Cholesteric liquid crystals -- Crystal structure -- Light transmission -- Liquid crystals -- Liquids -- Optical Kerr effect -- Plates (structural components) -- Chiral media -- External fields -- Forward-and-backward -- Light transmission spectra -- Propagation of lights -- Surface modes -- Waveguide surfaces -- Plate metal
Аннотация: Light transmission spectrum has been calculated for a 'cholesteric liquid crystal-phase plate-metal' structure. It is shown that the system can have an isolated waveguide surface mode with characteristics efficiently controllable by external fields acting on the cholesteric. This mode is similar to optical Tamm state. We observed anisotropy of transmission of the structure under consideration in the propagation of light of a certain polarization in forward and backward directions. This property is inherent in optically chiral media, such as the cholesteric liquid crystal.

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Доп.точки доступа:
Vetrov, S. Ya.; Ветров, Степан Яковлевич; Timofeev, I. V.; Тимофеев, Иван Владимирович; Progress In Electromagnetics Research Symposium(2015 ; July 6-9 ; Prague)
}
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