Библиотека института физики им. Л.В. Киренского СО РАН

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkova I. R., Tyryshkina L. E., Volochaev M. N., Zaloga A. N., Shabanova K. A., Ovchinnikov A. V., Lyamkin A. I.
Заглавие : The effect of aluminum-oxide powders on the structure and properties of copper electrodeposited composite coatings
Место публикации : Prot. Met. Phys. Chem. Surf. - 2023. - Vol. 59, Is. 1. - P.71-75. - ISSN 20702051 (ISSN), DOI 10.1134/S2070205122700022. - ISSN 2070206X (eISSN)
Примечания : Cited References: 9
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Voronin A. S., Fadeev Y. V., Ivanchenko F. S., Dobrosmyslov S. S., Makeev M. O., Mikhalev P. A., Osipkov A. S., Damaratsky I. A., Ryzhenko D. S., Yurkov G. Y., Simunin M. M., Volochaev M. N., Tambasov I. A., Nedelin S. V., Zolotovsky N. A., Bainov D. D., Khartov S. V.
Заглавие : Original concept of cracked template with controlled peeling of the cells perimeter for high performance transparent EMI shielding films
Место публикации : Surf. Interfaces. - 2023. - Vol. 38. - Ст.102793. - ISSN 24680230 (eISSN), DOI 10.1016/j.surfin.2023.102793
Примечания : Cited References: 73. - The development of the processes of synthesis of a cracked template and conceptualization and optimization parameters peeling cells perimeter of the cracked template for the requirements of the final products were carried out with the financial support of the Ministry of Science and Higher Education of the Russian Federation within the framework of state task No. 0287–2021–0026. The development of the processes of the formation of metal films and the study of the structural, optical, electrical and shielding properties of the samples were carried out with the financial support of the Ministry of Science and Higher Education of the Russian Federation within the framework of state assignment No. FSFN-2022–0007. The physicochemical analysis of materials was carried out on equipment from the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS». We would like to thank Anastasia Tamarovskaya for the macro photo of thick Ag mesh samples.
Аннотация: The problem of sputtering of thick metal films on micro and nanotemplates is important for obtaining mesh transparent conductors with excellent optoelectric characteristics. In this work, we demonstrate for the first time the possibility of controlling the degree of peeling of the cell perimeter from the substrate for a cracked template based on egg white by alternating the operations of moistening the template with saturated water vapor and shock drying with hot air. Local peeling of the cracked template cells perimeter makes it possible to increase the thickness of the metal sputtered on the cracked template by more than 1 µm, which is not achievable for other lithographic approaches. Our technique was used to obtain thick Ag meshes with a low sheet resistance of no more than 1.59 Ω/sq and a transparency of about 89.1%. The thick Ag meshes show a shielding efficiency (SE) of 49 dB or 99.998% of the incident power of an electromagnetic wave at a frequency of 1 GHz. In a sandwich geometry, thick Ag meshes, which simulates a real shielding window, the shielding efficiency (SE) reaches 71 dB with a transparency of more than 80%.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Подопригора, Владимир Георгиевич, Раковская С. А.
Заглавие : Определение характеристик поверхности диэлектрических пластин с помощью рассеяния света
Место публикации : Международ. журн. прикл. и фундамент. исслед. - 2023. - № 6. - С. 59-62. - ISSN 19963955 (ISSN), DOI 10.17513/mjpfi.13554
Примечания : Библиогр.: 5
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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Kuznetsov S. A., Lapanik V. I., Lugouskiy A. A., Timofeev S. N., Sutormin V. S., Zyryanov V. Ya.
Заглавие : Electrically-tunable reflectarrays for millimeter waves based on liquid-crystal-loaded high-impedance surfaces
Коллективы : "Terahertz and microwave radiation: generation, detection and applications", International conference, «Терагерцевое и микроволновое излучение: генерация, детектирование и приложения», конференции с международным участием, Национальный исследовательский ядерный университет МИФИ, Московский государственный университет им. М.В. Ломоносова, Национальный исследовательский центр "Курчатовский институт"
Место публикации : The 5-th International conference "Terahertz and microwave radiation: generation, detection and applications" (TERA-2023): abstract book. - Москва, 2023. - P.11
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Andryushchenko T. A., Lyashchenko S. A., Varnakov S. N., Ovchinnikov S. G., Shvetsov D. V., Yakovlev I. A.
Заглавие : Electron charge accumulation by island surfaces of Cr-Mn based MAX phase thin films on MgO
Коллективы : International Baltic Conference on Magnetism, Балтийский федеральный университет им. И. Канта
Место публикации : V International Baltic Conference on Magnetism. IBCM: Book of abstracts. - 2023. - P.129
Примечания : Cited References: 2. - РФН № 21-12-00226
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Omelyanchik A., Kamzin A. S., Valiullin A. A., Semenov V. G., Vereshchagin S. N., Volochaev M. N., Dubrovskiy A. A., Sviridova T., Kozenkov I., Dolan E., Peddis D., Sokolov A. Е., Rodionova V.
Заглавие : Iron oxide nanoparticles synthesized by a glycine-modified coprecipitation method: Structure and magnetic properties
Место публикации : Colloids Surf. A Physicochem. Eng. Asp. - 2022. - Vol. 647. - Ст.129090. - ISSN 09277757 (ISSN), DOI 10.1016/j.colsurfa.2022.129090
Примечания : Cited References: 80. - This work was supported by the Russian Science Foundation grant No. 21-72-20158 . The study of the structure was carried out on the equipment of the Center Collective Use " Materials Science and Metallurgy " which was purchased with the financial support of the Russian Federation represented by the Ministry of Education and Science (No. 075-15-2021-696)
Аннотация: Iron oxide magnetic nanoparticles (MNPs) are of interest in biomedicine and research owing to their moderate cytotoxicity and advanced properties, such as extensive surface-to-volume ratio and possibilities for tailoring their functionality through surface chemistry. To date, various approaches have been used for the synthesis of MNPs with controllable structural properties and various coatings to enhance their stability and functionality. This study describes a modified one-step method of coprecipitation in the presence of glycine allowing the production of particles with controllable size and in situ surface decoration. The effect of different glycine concentrations on the morphostructural and magnetic properties of iron oxide MNPs is studied. The particle size is reduced from 10.2 ± 0.3 to 7.2 ± 0.5 nm by increasing the glycine concentration from 0.06 up to 0.60 mol. The magnetic properties of obtained particles were tracked by SQUID magnetometry and Mossbauer spectroscopy. All samples of glycine capped iron oxide MNPs showed superparamagnetic behaviour at room temperature with maximal value of the saturation magnetization of 69 ± 4 Am2/kg. The results show the optimal concentration range of glycine which can be used in this method: a lower concertation than 0.15 mol does not affect the properties of obtained particles while higher concentrations than 0.3 mol lead to the reduction of magnetic properties (the saturation magnetisation reduces to 59 ± 3 Am2/kg when glycine concentration was 0.6 mol). The proposed economic and environment-friendly approach can be utilized to synthesise –NH2 functionalised MNPs for biomedical or wastewater treatment.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gokhfeld D. M., Savitskaya N. E., Popkov S. I., Kuzmichev N. D., Vasyutin M. A., Balaev D. A.
Заглавие : Anisotropic magnetization of an NbN film
Место публикации : J. Exp. Theor. Phys. - 2022. - Vol. 134, Is. 6. - P.707-712. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776122060097
Примечания : Cited References: 31. - We are grateful to I.V. Nemtsev for measurements on the scanning electron microscope, S.A. Skorobogatov for his help in magnetic measurements (scanning electron microscopy and magnetic measurements have been performed at the Krasnoyarsk Regional Collective Usage Center of the Federal Research Center “Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences”)
Аннотация: The structural and magnetic properties of a niobium nitride (NbN) film prepared by reactive sputtering onto a quartz substrate are investigated. It is shown using scanning electron microscopy that the film has a columnar structure with a diameter of crystallite columns of about 50 nm. The film magnetization loops are measured for the field orientation parallel and perpendicular to its surface. Based on the experimental data, the critical current densities of the film are estimated in both cases. For the field parallel to the film surface, the estimate is 6.5 × 104 A/cm2 at the liquid helium temperature. For the field perpendicular to the surface, the critical current density is close to the depairing current density (107 A/cm2). Analysis of the results based on different models of magnetic vortex pinning in superconductors shows that in the former case, pinning occurs at the boundaries of columns in the bulk of the sample, while in the latter case, it is determined by the influence of the surface barrier.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sutormin V. S., Krakhalev M. N., Timofeev I. V., Bikbaev R. G., Prishchepa O. O., Zyryanov V. Ya.
Заглавие : Cholesteric layers with tangential-conical surface anchoring for an electrically controlled polarization rotator
Место публикации : Opt. Mater. Express. - 2021. - Vol. 11, Is. 5. - P.1527-1536. - ISSN 21593930 (ISSN), DOI 10.1364/OME.425130
Примечания : Cited References: 25. - Russian Science Foundation (Grant No. 18-72-10036)
Аннотация: The voltage dependences of polarization characteristics of light passed through the cholesteric layers with tangential-conical boundary conditions have been investigated. It has been shown that such layers allow turning the polarization azimuth more than 70˚ because of the unique untwisting effect of the cholesteric helix, due to free azimuthal rotation of the director on the substrate with conical anchoring. Optical cells under study have some advantages (low control voltage, smooth variation of polarization azimuth, simplicity of design) and can be used as an electrically controlled polarization rotator of white light.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Melchakova I., Nikolaeva K. M., Kovaleva E. A., Tomilin F. N., Ovchinnikov S. G., Tchaikovskaya O. N., Avramov P. V., Kuzubov A. A.
Заглавие : Potential energy surfaces of adsorption and migration of transition metal atoms on nanoporus materials: The case of nanoporus bigraphene and G-C3N4
Место публикации : Appl. Surf. Sci. - 2021. - Vol. 540. - Ст.148223. - ISSN 01694332 (ISSN), DOI 10.1016/j.apsusc.2020.148223
Примечания : 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
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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Liu, Ji-Cai, Savchenko, Viktoriia, Kimberg V., Gel'mukhanov F., Odelius, Michael
Заглавие : High-resolution x-ray spectra of carbon monoxide reveal ultrafast dynamics induced by long UV pulse
Коллективы : RFBRRussian Foundation for Basic Research (RFBR) [19-29-12015]; National Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [11974108, 11574082]; Fundamental Research Funds for the Central UniversitiesFundamental Research Funds for the Central Universities [2021MS046]; European UnionEuropean Commission [860553]; Carl Tryggers Foundation [CTS18:285]; Helmholtz Virtual Institute [VI419]; Swedish Research CouncilSwedish Research CouncilEuropean Commission [VR 2019-03470, 2018-05973]
Место публикации : New J. Phys. - 2021. - Vol. 23, Is. 6. - Ст.063030. - ISSN 1367-2630, DOI 10.1088/1367-2630/ac0198
Примечания : Cited References: 47. - The reported study was funded by RFBR, project number 19-29-12015. J-CL thanks the support by the National Science Foundation of China under Grant Nos. 11974108, 11574082, and the Fundamental Research Funds for the Central Universities (No. 2021MS046). MO acknowledges funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skodowska-Curie Grant Agreement No. 860553 and the Carl Tryggers Foundation (contract CTS18:285). FG acknowledges also the support from the Helmholtz Virtual Institute VI419 'Dynamic Pathways in Multidimensional Landscapes'. VK acknowledges the Swedish Research Council (VR 2019-03470). The calculations were partially enabled by resources provided by the Swedish National Infrastructure for Computing (SNIC) partially funded by the Swedish Research Council through Grant Agreement No. 2018-05973
Предметные рубрики: VIBRATIONAL STRUCTURE
SCATTERING
RAMAN
CO
COLLAPSE
PROBE
Аннотация: In theoretical simulations of a UV + x-ray pump-probe (UVX-PP) setup, we show that frequency detuning of the pump UV pulse acts as a camera shutter by regulating the duration of the UVX-PP process. This two-photon absorption with long overlapping UV and x-ray pulses, allowing for high spectral resolution, thereby provides information about ultrafast dynamics of the nuclear wave packet without the requirement of ultrashort pulses and controlled delay times. In a case study of carbon monoxide, the calculated UVX-PP spectra of the O1s−12π1 and C1s−12π1 core-excited states show different vibrational profiles. The interference of intermediate vibrational states reveals details of nuclear dynamics in the UVX-PP process related to a variable duration time controlled by the UV detuning. Both O1s−12π1 and C1s−12π1 pump-probe channels display a splitting of the spectral profile, which however is associated with different physical mechanisms. At the O1s−12π1 resonance, the observed dispersive and non-dispersive spectral bands intersect and result in destructive interference.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chepkasov I. V., Baidyshev V. S., Sukhanova E. V., Visotin M. A., Sule P., Popov Z. I.
Заглавие : Iron silicides formation on Si (100) and (111) surfaces through theoretical modeling of sputtering and annealing
Место публикации : Appl. Surf. Sci. - 2020. - Vol. 527. - Ст.146736. - ISSN 01694332 (ISSN), DOI 10.1016/j.apsusc.2020.146736
Примечания : Cited References: 67. - We thank Dr. Ivan Tarasov for fruitful discussions. The research is carried out using the equipment of the shared research facilities of HPC computing resources at Lomonosov Moscow State University and resources of the Center for the Information and Computing of Novosibirsk State University. The molecular dynamics study of sputtering and annealing iron silicides was supported by the Russian Science Foundation, project no. 16-13-00060-П. All quantum-chemical calculations were supported by Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST “MISiS” (No. K2-2020-009)
Аннотация: The iron silicides formation during epitaxial film grown process on the (100) and (111) silicon surfaces were investigated using molecular dynamics (MD). The iron and silicon atom deposition rate and silicon substrate temperature influence on the formed iron silicide structure and stoichiometric composition were studied in detail. During the growth of iron silicide crystal structure significant diffusion of the substrate atoms into the forming BCC core occurs, this intensifies with the substrate temperature increase, and the ratio of substrate atoms inside the Fe3Si phase reaches nearly 12%. The BCC structure formation is less active on the (100) surface, and at the temperatures as low as 26 °C and 300 °C the iron silicide crystal phase does not form at all. However, with the temperature increase or the deposition rate decrease, the crystal structure formation processes occur more actively in both cases of (100) and (111) surfaces. Thus, the effect of the deposition rate decrease is identical to the temperature growth. It was shown that the formation of the structured B2 phase of iron silicide in buffer layer between the film and the substrate leads to the inhibition of the mutual diffusion of iron and silicon atoms.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorobyev S. A., Likhatski M. N., Romanchenko A. S., Fetisova O. Y., Kazachenko A. S., Volochaev M. N., Mikhlin Y. L.
Заглавие : Fabrication of Extremely Concentrated Silver Hydrosols without Additional Stabilizers
Место публикации : ACS Sustain. Chem. Eng. - 2020. - Vol. 8, Is. 46. - P.17225-17233. - ISSN 21680485 (ISSN), DOI 10.1021/acssuschemeng.0c06006
Примечания : Cited References: 64. - This research was supported by the Russian Science Foundation, grant 18-73-00142 (S.A.V.). We acknowledge that facilities of the Krasnoyarsk Regional Research Equipment Centre of SB RAS were employed in the work
Аннотация: Applications of silver nanoparticles (Ag NPs) in modern technologies require environmentally friendly methods of large-scale production of the nanoparticles with controlled morphology and surface state in the form of high-concentration metal sols with minimal quantities of organic stabilizers. Herein, we report a procedure based on reduction of aqueous silver nitrate with ferrous sulfate in the presence of citrate ions. We studied the effect of various factors on the chemical reaction by applying transmission electron microscopy, ultraviolet-visible absorption spectroscopy, and dynamic light scattering (DLS) and proposed protocols with reduced quantities of the reagents allowing preparation of uniform spherical Ag NPs of 5 to 15 nm in diameter. A DLS study of sols after dilution was employed to estimate the tendency of colloidal particles to interact in order to optimize post-synthetic purification and concentration procedures. Particularly, filtration instead of centrifugation and electrolytic coagulation with trisodium citrate in place of sodium nitrate were utilized to produce extremely concentrated, more than 1000 g/L Ag, and stable silver hydrosols with no additional stabilizers. The chemical, X-ray photoelectron spectroscopy, and thermogravimetric analyses demonstrated that the Ag NPs contained citrate-derived capping ligands, and low amounts of Fe are appropriated for chemical and low-temperature sintering, surface functionalization, nanofluidics, and other applications.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhlin Y., Romanchenko A., Vorobyev S., Karasev S., Volochaev M. N., Kamenskiy E., Burdakova E.
Заглавие : Ultrafine particles in ground sulfide ores: A comparison of four Cu-Ni ores from Siberia, Russia
Место публикации : Ore Geol. Rev.: Elsevier, 2017. - Vol. 81, Part 1. - P.1-9. - ISSN 0169-1368, DOI 10.1016/j.oregeorev.2016.10.024
Примечания : Cited References: 64. - This research was supported by the Russian Science Foundation, grant no. 14-17-00280.
Ключевые слова (''Своб.индексиров.''): 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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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Wigneron J. -P., Jackson T. J., O'Neill P., De Lannoy G., de Rosnay P., Walker J. P., Ferrazzoli P., Mironov V. L., Bircher S., Grant J. P., Kurum M., Schwank M., Munoz-Sabater J., Das N., Royer A., Al-Yaari A., Al Bitar A., Fernandez-Moran R., Lawrence H., Mialon A., Parrens M., Richaume P., Delwart S., Kerr Y.
Заглавие : Modelling the passive microwave signature from land surfaces: A review of recent results and application to the L-band SMOS & SMAP soil moisture retrieval algorithms
Место публикации : Remote Sens. Environ.: Elsevier, 2017. - Vol. 192. - P.238-262. - ISSN 00344257 (ISSN), DOI 10.1016/j.rse.2017.01.024
Примечания : Cited References: 187. - This research work was funded by CNES (Centre National d'Etudes Spatiales) through the Science TOSCA (Terre Océan Surfaces Continentales et Atmosphère) program. The authors wish to thank the three anonymous reviewers for their helpful comments and Sylvie Renaud (IMS) for fruitful discusions.
Ключевые слова (''Своб.индексиров.''): atmospheric temperature--climate models--moisture--moisture control--scanning antennas--soils--vegetation--experimental campaign--microwave brightness temperature--passive microwave signatures--semiempirical models--soil moisture retrievals--surface soil moisture--surface temperatures--system configurations--soil moisture
Аннотация: Two passive microwave missions are currently operating at L-band to monitor surface soil moisture (SM) over continental surfaces. The SMOS sensor, based on an innovative interferometric technology enabling multi-angular signatures of surfaces to be measured, was launched in November 2009. The SMAP sensor, based on a large mesh reflector 6 m in diameter providing a conically scanning antenna beam with a surface incidence angle of 40°, was launched in January of 2015. Over the last decade, an intense scientific activity has focused on the development of the SM retrieval algorithms for the two missions. This activity has relied on many field (mainly tower-based) and airborne experimental campaigns, and since 2010–2011, on the SMOS and Aquarius space-borne L-band observations. It has relied too on the use of numerical, physical and semi-empirical models to simulate the microwave brightness temperature of natural scenes for a variety of scenarios in terms of system configurations (polarization, incidence angle) and soil, vegetation and climate conditions. Key components of the inversion models have been evaluated and new parameterizations of the effects of the surface temperature, soil roughness, soil permittivity, and vegetation extinction and scattering have been developed. Among others, global maps of select radiative transfer parameters have been estimated very recently. Based on this intense activity, improvements of the SMOS and SMAP SM inversion algorithms have been proposed. Some of them have already been implemented, whereas others are currently being investigated. In this paper, we present a review of the significant progress which has been made over the last decade in this field of research with a focus on L-band, and a discussion on possible applications to the SMOS and SMAP soil moisture retrieval approaches. © 2017 Elsevier Inc.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Подопригора, Владимир Георгиевич
Заглавие : Определение динамических и электрооптических характеристик поверхности и ультратонких молекулярных плёнок
Место публикации : Межд. журн. прикл. и фундамент. исслед. - 2017. - № 4. Ч. 2. - 328-331. - ISSN 1996-3955
Примечания : Библиогр.: 5
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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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Shabanov V. F., Zyryanov V. Ya.
Заглавие : Light transmission of liquid crystal domains formed by polycarbonate surface
Место публикации : Opt. Mater. Express: Optical Society of America, 2016. - Vol. 6, Is. 9. - P.2841-2846. - ISSN 21593930 (ISSN), DOI 10.1364/OME.6.002841
Примечания : Cited References: 15. - This work was partially supported by the Russian Foundation for Basic Research (projects Nos. 15-02-06924 and 16-53-00073), and by the Siberian Branch of the Russian Academy of Sciences (SB RAS) through Complex Program No. II.2P 0358-2015-0011, 0358-2015-0010.
Ключевые слова (''Своб.индексиров.''): electric fields--electric lines--laser beams--liquid crystals--liquids--nematic liquid crystals--polycarbonates--refractive index--coherence distance--disclination lines--interference oscillations--liquid crystal layers--monochromatic lasers--polarization direction--polymer surfaces--radial orientation--light transmission
Аннотация: We investigate the optical transmission of a monochromatic laser beam passing through an individual domain of a nematic liquid crystal formed by the polycarbonate surface. The domain has the radial orientation structure with a disclination line on the polymer surface, which gradually transforms to "pseudoplanar" alignment at the coherence distance ? from the surface. The dependence of the optical transmittance on an electric field applied to the domain are different at various light polarization directions relative to the disclination lines and, in the absence of an analyzer, are accompanied by interference oscillations. To explain the results obtained, a domain is considered to be a gradient lens with the refractive index variable in the plane perpendicular to the laser beam and the resulting deflecting effect that was collected at the beam path through the liquid crystal layer. © 2016 Optical Society of America.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzubov A. A., Kovaleva E. A., Tomilin F. N., Mikhaleva N. S., Kuklin A. V.
Заглавие : On the possibility of contact-induced spin polarization in interfaces of armchair nanotubes with transition metal substrates
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2015. - Vol. 396. - P.102-105. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2015.08.037
Примечания : Cited References: 24. - 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. 161500.2014/K). The authors would like to thank Institute of Computational Modeling of SB RAS, Krasnoyarsk; Joint Supercomputer Center of RAS, Moscow; Center of Equipment for Joint Use of Siberian Federal University, Krasnoyarsk: and Siberian Supercomputer Center (SSCC) of SB RAS, Novosibirsk for providing the access to their supercomputers.
Предметные рубрики: INITIO MOLECULAR-DYNAMICS
TOTAL-ENERGY CALCULATIONS
AUGMENTED-WAVE METHOD
CARBON NANOTUBES
BASIS-SET
1ST-PRINCIPLES
SURFACES
Ключевые слова (''Своб.индексиров.''): nanotubes--cobalt--nickel--spin polarization--dft
Аннотация: The interaction between armchair carbon and boron nitride nanotubes (NT) with ferromagnetic transition metal (TM) surfaces, namely, Ni(111) and Co(0001), was studied by means of density functional theory. Different configurations of composite compartments mutual arrangement were considered. Partial densities of states and spin density spatial distribution of optimized structures were investigated. Influence of ferromagnetic substrate on nanotubes' electronic properties was discussed. The values of spin polarization magnitude at the Fermi level are also presented and confirm the patterns of spin density spatial distribution. © 2015 Elsevier B.V. All rights reserved.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sandalov I. S., Zamkova N. G., Zhandun V. S., Tarasov I. A., Varnakov S. N., Yakovlev I. A., Solovyov L. A., Ovchinnikov S. G.
Заглавие : Effect of electron correlations on the Fe3Si and α- FeSi2 band structure and optical properties
Коллективы : Russian Fund of Basic Research [14002-00186, 13-02-01265]; President of Russia Grants [2886.2014.2, 924.2014.2]
Место публикации : Phys. Rev. B: American Physical Society, 2015. - Vol. 92, Is. 20. - Ст.205129. - ISSN 1098-0121, DOI 10.1103/PhysRevB.92.205129. - ISSN 1550-235X(eISSN)
Примечания : Cited References:69. - The theoretical part of this work was supported by Russian Fund of Basic Research, Grant No. 14002-00186 and the President of Russia Grants No. 2886.2014.2 and No. 924.2014.2 for support of Leading Scientific School. The calculations were performed with the computer resources of NRC "Kurchatov Institute" (ui2.computing.kiae.ru). The experimental work was supported by Russian Fund of Basic Research, Grant No. 13-02-01265. I.S. thanks A. Ruban for useful discussion.
Предметные рубрики: DENSITY-FUNCTIONAL THEORY
TOTAL-ENERGY CALCULATIONS
AUGMENTED-WAVE METHOD
BASIS-SET
METALS
ABSORPTION
EMISSION
SURFACES
ALLOYS
LAYERS
Аннотация: We use the Vienna ab initio simulation package (vasp) for evaluation of the quasiparticle spectra and their spectral weights within Hedin's GW approximation (GWA) for Fe3Si and α-FeSi2 within the non-self-consistent one-shot approximation G0W0 and self-consistent scGWA with the vertex corrections in the particle-hole channel, taken in the form of two-point kernel. As input for G0W0, the band structure and wave functions evaluated within the generalized gradient corrected local-density approximation to density functional theory (GGA) have been used. The spectral weights of quasiparticles in these compounds deviate from unity everywhere and show nonmonotonic behavior in those parts of bands where the delocalized states contribute to their formation. The G0W0 and scGWA spectral weights are the same within 2%–5%. The scGWA shows a general tendency to return G0W0 bands to their GGA positions for the delocalized states, while in the flat bands it flattens even more. Variable angle spectroscopic ellipsometry measurements at T=296 K on grown single-crystalline ∼50-nm-thick films of Fe3Si on n-Si(111) wafer have been performed in the interval of energies ω∼(1.3–5) eV. The comparison of G0W0 and scGW theory with experimental real and imaginary parts of permittivity, refractive index, extinction and absorption coefficients, reflectivity, and electron energy loss function shows that both G0W0 and scGW qualitatively describe experiment correctly, the position of the low-energy peaks is described better by the scGW theory, however, its detailed structure is not observed in the experimental curves. We suggest that the angle-resolved photoemission spectroscopy experiments, which can reveal the fine details of the quasiparticle band structure and spectral weights, could help to understand (i) if the scGWA with this type of vertex correction is sufficiently good for description of these iron silicides and, possibly, (ii) why some features of calculated permittivity are not seen in optical experiments.
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19.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Pyatnov M. V., Vetrov S. Ya., Timofeev I. V.
Заглавие : Controlled photonic surface modes in 'cholesteric liquid crystal - Phase plate - Metal' structure
Коллективы : Progress In Electromagnetics Research Symposium
Место публикации : Progress in Electromagnetics Research Symposium: Proceedings. - 2015. - Vol. 2015-January. - P.224-227. - ISBN 9781934142301
Ключевые слова (''Своб.индексиров.''): 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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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zaitsev A. I., Aleksandrovsky A. S., Kozhukhov A. S., Pokrovsky L. D., Atuchin V. V.
Заглавие : Growth, optical and microstructural properties of PbB4O7 plate crystals
Коллективы : SB RAS [28.14, 43.14]; President of the Russian Federation for the support of leading scientific schools [SS-4828.2012.2]; PSB RAS [2.5.2]; Ministry of Education and Science of the Russian Federation
Место публикации : Opt. Mater.: Elsevier Science, 2014. - Vol. 37. - P.298–301. - ISSN 0925-3467, DOI 10.1016/j.optmat.2014.06.012. - ISSN 1873-1252
Примечания : Cited References: 42. - This study is supported by SB RAS via Projects 28.14 and 43.14, and the Grant of the President of the Russian Federation for the support of leading scientific schools SS-4828.2012.2 and by PSB RAS, Grant 2.5.2. V.V.A. gratefully acknowledge the Ministry of Education and Science of the Russian Federation for financial support
Предметные рубрики: LEAD TETRABORATE
SINGLE-CRYSTAL
SUSCEPTIBILITIES
ANISOTROPY
STRONTIUM
SURFACES
RAMAN
Ключевые слова (''Своб.индексиров.''): pbb4o7--czochralski growth--facet--rheed--afm
Аннотация: Centimeter-sized optical quality plate-like PbB4O7 crystals have been grown by Czochralski method. The fundamental absorption edge has been found at 237 nm (corresponding bandgap 5.75 eV) with the distinct sideband protruding up to 300 nm. The crystals are well faceted with the (100), (010) and (101) planes, (100) surfaces being mostly developed. The etching in diluted nitric acid (5 wt.%) at the temperature of 90 °C have been used to reveal the defect structure and remove melt residuals. The (100) surface shows the presence of etching pits and twin boundaries. The Kikuchi line pattern and developed microrelief with the roughness of ~8 nm have been observed by RHEED and AFM, respectively.
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