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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Кашкина, Людмила Васильевна, Петраковская, Элеонора Анатольевна, Емельянова, Татьяна Юрьевна, Стебелева, Олеся Павловна
Заглавие : Исследование методом ЭМР структурно-химических изменений природного углеродосодержащего материала при СВЧ-воздействии
Место публикации : Изв. вузов. Химия и хим. технол. - 2017. - Т. 60, № 9. - С. 33-38. - ISSN 0579-2991, DOI 10.6060/tcct.2017609.2y
Примечания : Библиогр.: 12
Ключевые слова (''Своб.индексиров.''): уголь--электромагнитная энергия--диспергирование--органическая структура--электронная структура--coal--electromagnetic energy--ldispersion--organic structure--electronic structure
Аннотация: Для расширения области практического использования угля как нетопливного материала понимание природы проводимости углей при различных внешних воздействиях чрезвычайно важно. В настоящее время развивается СВЧ-технология обработки угля с целью улучшения его качества (уменьшение влажности, зольности, увеличение дисперсности при диспергировании и т.д.). В данной работе исследовался Канско-Ачинский бурый уголь (зольность 8%, влажность 20%) после СВЧ-сушки в течение 60 и 120 с, в микроволновой печи мощностью 850 Вт. Методом РЭМ проведено рентгеновское картирование поверхности образцов с целью исследования элементного состава органической части угля и его минеральных составляющих и деструкции угольных частиц в поле СВЧ (растровый электронный микроскоп Hitachi TM-30000). Для изучения влияния СВЧ-сушки на уголь применен метод ЭМР, позволяющий исследовать связь структуры и электронных свойств угольного вещества (ЭМР-спектрометр Х-диапазона SE/X-2544). В результате анализа изменения параметров спектров ЭМР образцов угля после СВЧ-воздействия обнаружено сходство электронной структуры угля со структурой многокомпонентных органических стекол. После СВЧ-воздействия наблюдается увеличение подвижности и перераспределения положений парамагнитных ионов, в частности Fe3+, в более стабильные положения внутри кислородных тетраэдров в аморфной (органической) части угля. Подвижными являются электроны радикальных центров, образованных атомами углерода карбонильных, карбоксильных, феноксильных групп и углеводородных фрагментов различного типа. Показано, что удаление воды в результате СВЧ-воздействия также оказывает глубокое влияние на концентрацию и природу радикалов, т. е. на электронную структуру углей.In order to expand the field of practical application of coal as a non-fuel material, understanding the nature of coal conductivity under various external influences is extremely important. At present the microwave technology of coal processing is developing in order to improve its quality (reduction of moisture, ash content, and better dispersion). In this paper the Kansko-Achinsk brown coal (ash content of 8%, humidity of 20%) after microwave drying for 60, 120 s in a microwave oven, at power of 850 W was investigated. The X-ray mapping of the samples surface was carried out using the SEM method to study the elemental composition of the coal organic part and its mineral components and the destruction of carbon particles in the microwave field (Hitachi TM- 30000 scanning electron microscope). The ESR method, which allows to investigate the relation between the structure and electronic properties of coal matter, was applied to study the effect of microwave drying on coal (X-band SE / X-2544 EMF spectrometer). The similarity of the coal electronic structure with the multicomponent organic structure glasses was found as a result of the analysis of the changes in the ESR spectra parameters of coal samples (300 K, 83 K) after microwave exposure. The mobility and redistribution of paramagnetic ions positions, in particular Fe3+ to more stable positions inside oxygen tetrahedra in the amorphous (organic) part of the coal is observed after microwave action. The electrons of the radical centers formed by the carbon atoms of the carbonyl, carboxyl, phenoxy groups and hydrocarbon fragments of various types are mobile. It has been shown that the water removal as a result of microwave exposure also has a profound effect on the concentration and nature of the radicals, i.e. on the electronic structure of the coals.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Тамбасов, Игорь Анатольевич, Немцев, Иван Васильевич, Савранский Д. С., Мацынин, Алексей Александрович, Ежикова Е. В.
Заглавие : Влияние фотонной обработки и температуры на проводимость In2O3 пленок, полученных автоволновым окислением
Место публикации : Вестник СибГАУ. - 2013. - № 3. - С. 103-106. - ISSN 1816-9724
Примечания : Работа выполнена частично при финансовой поддержке ФЦП «Исследования и разработки по приоритетным направлениям развития научно-технологичного комплекса России на 2007-2013 годы» (госконтракт № 14.513.11.0023), а также Министерства образования и науки Российской Федерации (договор № 02.G25.31.0043)
Ключевые слова (''Своб.индексиров.''): тонкие пленки--оксид индия--автоволновое окисление--ультрафиолетовое облучение--thin films--indium oxide--auto-wave oxidation--ultraviolet irradiation
Аннотация: Пленки оксида индия были синтезированы автоволновой реакцией окисления на покровном стекле, кварце и монокристалле MgO. Толщина пленки измерялась с помощью режима «cross-section» сканирующего электронного микроскопа и составляла ~300 нм. Оптическая ширина запрещенной зоны оксида индия была ~3.5 эВ. Исследования сопротивления In2O3 пленки от температуры в теневых условиях показали, что при нагревании до 100 0С сопротивление увеличивается на ~10 %. Показано, что при фотооблучении происходит резкое уменьшение электрического сопротивления пленок, максимальное изменение которого составило 52 % при комнатной температуре. Определены две скорости релаксации сопротивления пленок после прекращения облучения 15 Ом/сек первые 30 сек и 7 Ом/сек в остальное время. Сделано предположение, что фотовосстановление является доминирующим механизмом, ответственным за изменения проводимости пленок.Indium oxide films were synthesized by auto-wave oxidation reaction on the cover glass, quartz and single crystal MgO. The film thickness was measured with a mode «cross-section» scanning electron microscope and was ~ 300 nm. Optical band gap of indium oxide was ~3.5 eV. The study of In2O3 film resistance versus temperature in the dark conditions showed that when heated to 100 °C the resistance increases by about 10 %. It is shown that the_ films electric resistance decreases sharply under photo radiation and the maximum change was 52 % at room temperature. The two film resistance relaxation rates after irradiation have been determined to be 15 Ohm/s the first 30 seconds and 7 Оhm/s f for the rest, respectively. On the basis of the above stated the authors suggest that the photo reduction is the dominant mechanism responsible for the changes in conductivity of In 2O 3 films.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Baek W., Gromilov S. A., Kuklin A. V., Kovaleva E. A., Fedorov A. S., Sukhikh A. S., Hanfland M., Pomogaev V. A., Melchakova I. A., Avramov P. V., Yusenko K. V.
Заглавие : Unique Nanomechanical Properties of Diamond-Lonsdaleite Biphases: Combined Experimental and Theoretical Consideration of Popigai Impact Diamonds
Место публикации : Nano Lett. - 2019. - Vol. 19, Is. 3. - P.1570-1576. - ISSN 1530-6984, DOI 10.1021/acs.nanolett.8b04421. - ISSN 1530-6992(eISSN)
Примечания : Cited References: 38. - The authors thank Dr. Valentin Afanasiev (Sobolev Institute of Geology and Mineralogy, Novosibirsk, Russia) for giving us access to a representative set of impact diamonds from Popigai astrobleme. The authors also acknowledge ID-15B beamline at the European Synchrotron Radiation Facility (ESRF) for providing measurement times and technical support. Dr. Valerio Cerantola (ESRF) is thanked for his kind support with the laser-heating setup. W.B., A.V.K., and P.V.A. acknowledge the National Research Foundation of Republic of Korea for support under grant no. NRF-2017R1A2B4001410.
Предметные рубрики: CARBON
PRESSURES
GRAPHITE
HARDNESS
ORIGIN
Аннотация: For the first time, lonsdaleite-rich impact diamonds from one of the largest Popigai impact crater (Northern Siberia) with a high concentration of structural defects are investigated under hydrostatic compression up to 25 GPa. It is found that, depending on the nature of a sample, the bulk modulus for lonsdaleite experimentally obtained by X-ray diffraction in diamond-anvil cells is systematically lower and equal to 93.3–100.5% of the average values of the bulk moduli of a diamond matrix. Density functional theory calculations reveal possible coexistence of a number of diamond/lonsdaleite and twin diamond biphases. Among the different mutual configurations, separate inclusions of one lonsdaleite (001) plane per four diamond (111) demonstrate the lowest energy per carbon atom, suggesting a favorable formation of single-layer lonsdaleite (001) fragments inserted in the diamond matrix. Calculated formation energies and experimental diamond (311) and lonsdaleite (331) powder X-ray diffraction patterns indicate that all biphases could be formed under high-temperature, high-pressure conditions. Following the equation of states, the bulk modulus of the diamond (111)/lonsdaleite (001) biphase is the largest one among all bulk moduli, including pristine diamond and lonsdaleite.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Hoffman A. E. J., Senkovska I., Krylov A. S., Kaskel S., Speybroeck V. V.
Заглавие : Unfolding the terahertz spectrum of soft porous crystals: rigid unit modes and their impact on phonon properties
Коллективы : International Conference on Metal-Organic Frameworks and Open Frameworks Compounds
Место публикации : International Conference on Metal-Organic Frameworks and Open Frameworks Compounds (MOF 2022): book of abstracts. - 2022. - P.254
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hoffman A. E.J., Senkovska I., Wieme J., Krylov A. S., Kaskel S., Van Speybroeck V.
Заглавие : Unfolding the terahertz spectrum of soft porous crystals: rigid unit modes and their impact on phase transitions
Место публикации : J. Mater. Chem. A. - 2022. - Vol. 10, Is. 33. - P.17254-17266. - ISSN 20507488 (ISSN), DOI 10.1039/d2ta01678h
Примечания : Cited References: 80. - This work was financially supported by the Fund for Scientific Research Flanders (FWO), the Research Board of the Ghent University (BOF), the Deutsche Forschungsgemeinschaft (DFG, project number 448809307), and the Russian Foundation for Basic Research (RFBR, project number 21-52-12018). The authors thank Kerstin Zechel for sample synthesis. The computational resources and services used in this work were provided by the Flemish Supercomputer Center (VSC), funded by FWO and the Flemish Government
Аннотация: Phase transitions in flexible metal-organic frameworks or soft porous crystals are mediated by low-frequency phonons or rigid-unit modes. The alteration of specific building blocks may change the lattice dynamics of these frameworks, which can influence the phase transition mechanism. In this work, the impact of building block substitution on the rigid-unit modes in flexible MIL-53 analogs with a winerack topology will be investigated via ab initio lattice dynamics calculations. First, the accuracy of the theoretical simulations is verified via experimental Raman measurements, which provide unique fingerprint vibrations in the terahertz range to characterize the phase transition. Following analysis of the low-frequency vibrations shows that there exists a set of universal rigid-unit modes inducing translations and/or rotations of the building blocks. The theoretical results demonstrate that linker substitutions have a large effect on the rigid-unit mode frequencies, whereas this is less so for inorganic chain substitutions. These findings may help to rationally tune the phonon frequencies in soft porous crystals.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Korshunov M. M., Togushova Yu. N., Dolgov O. V., Efremov D. V., Golubov A. A.
Заглавие : Unexpected impact of magnetic disorder on multiband superconductivity
Коллективы : "Фундаментальные проблемы высокотемпературной сверхпроводимости", Международная конференция, Физический институт им. П.Н. Лебедева РАН, Научный совет по физике конденсированного состояния РАН, Научный совет по физике низких температур РАН
Место публикации : V Междунар. конф. "Фундамент. пробл. высокотемп. сверхпров-ти" (ФПС'2015): сб. расширенных тезисов. - М.: ФИАН, 2015. - С. 46-47
Примечания : Библиогр.: 11 назв.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. M., Efremov D. V., Golubov A. A., Dolgov O. V.
Заглавие : Unexpected impact of magnetic disorder on multiband superconductivity
Коллективы : Dynasty Foundation; ICFPM; Ministry of Education and Science of the Russian Federation [14Y26.31.0007]; RFBR [12-02-31534, 13-02-01395]; Leading Scientific Schools of the Russian Federation [NSh-2886.2014.2]; DFG [1458]; EU-Japan
Место публикации : Phys. Rev. B: American Physical Society, 2014. - Vol. 90, Is. 13. - ISSN 1098-0121, DOI 10.1103/PhysRevB.90.134517. - ISSN 1550-235X
Примечания : Cited References: 41. - The authors are grateful to S.-L. Drechsler, P.J. Hirschfeld, K. Kikoin, and S.G. Ovchinnikov for useful discussions. We acknowledge partial support by the Dynasty Foundation and ICFPM (MMK), the Ministry of Education and Science of the Russian Federation (Grant No. 14Y26.31.0007), RFBR (Grant Nos. 12-02-31534 and 13-02-01395), President Grant for Government Support of the Leading Scientific Schools of the Russian Federation (NSh-2886.2014.2), DFG Priority Program 1458, and FP7 EU-Japan program IRON SEA.
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTIVITY
PARAMAGNETIC IMPURITIES
IRON
CONDUCTIVITY
ALLOYS
Аннотация: We analyze how the magnetic disorder affects the properties of the two-band s± and s++ models, which are the subject of discussions regarding iron-based superconductors and other multiband systems like MgB2. We show that there are several cases when the transition temperature Tc is not fully suppressed by magnetic impurities in contrast to the Abrikosov-Gor'kov theory, but a saturation of Tc takes place in the regime of strong disorder. These cases are: (1) the purely interband impurity scattering and (2) the unitary scattering limit. We show that in the former case the s± gap is preserved, while the s++ state transforms into the s± state with increasing magnetic disorder. For case (2), the gap structure remains intact.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Artyushenko P. V., Tomilin F. N., Kuzubov A. A., Ovchinnikov S. G., Tsikalova P. E., Ovchinnikova T. M., Soukhovolsky V. G.
Заглавие : The stability of the pheromones of xylophagous insects to environmental factors: An evaluation by quantum chemical analysis
Место публикации : Biophysics: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 62, Is. 4. - P.532-538. - ISSN 00063509 (ISSN), DOI 10.1134/S0006350917040029
Примечания : Cited References: 50
Ключевые слова (''Своб.индексиров.''): insects--xylophages--pheromones--molecules--chemical properties--environment--impact--information--research--effectiveness
Аннотация: The ground and excited states of the pheromone molecules produced by xylophagous insects (the bark beetle Ips typographus L., the black fir sawyer beetle Monochamus urussovi Fisch., and the black pine sawyer M. galloprovincialis Oliv.) were modeled using a quantum chemical method utilizing DFT (density functional theory) with the B3LYP functional. The absorption wavelengths (energies) and dipole moments were calculated; the transitions of electrons from occupied to empty molecular orbitals were considered. The computed data were used to assess the stability of pheromone molecules exposed to environmental factors, such as solar radiation and humidity.
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Вид документа : Статья из сборника (выпуск монографической серии)
Шифр издания :
Автор(ы) : Kashkina L. V., Petrakovskaya E. A., Yemelyanova T. Y., Stebeleva O. P.
Заглавие : The impact of microwaves of different timing on the structural and chemical characteristics of a carbonaceous natural material
Коллективы : International Science and Engineering Conference on High Technology: Research and Applications
Место публикации : Key Eng. Mater. - 2017. - Vol. 743 KEM. - P.437-442. - , DOI 10.4028/www.scientific.net/KEM.743.437
Примечания : Cited References: 11
Ключевые слова (''Своб.индексиров.''): coal--electromagnetic energy--dispersion organic structure--organic structure--electronic structure
Аннотация: Changes in the properties of brown Kansk-Achinsk coal after exposure to microwaves have been studied using scanning electron microscopy (SEM) and electron magnetic resonance (EMR). The size composition of the samples has been investigated. The structure of coal has been found to be similar to the structure of multicomponent organic glass. The analysis of the changes in the EMR spectra of the coal samples (300 K, 83 K) exposed to microwaves has been found to gather information about the structural transformation taking place in the coal matter.
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10.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Stebeleva O. P., Kashkina L. V., Petrakovskaya E. A., Nikitin S. L., Valiullin T. R.
Заглавие : The impact of cavitation-activated water on combustion dynamics and environmental characteristics of coal-water slurry fuel
Коллективы : International Workshop on Advanced Technologies in Material Science, Mechanical and Automation Engineering
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2019. - Vol. 537: International Workshop on Advanced Technologies in Material Science, Mechanical and Automation Engineering - MIP: Engineering-2019 (4 April 2019 through 6 April 2019) Conference code: 149243, Is. 6. - Ст.062056. - , DOI 10.1088/1757-899X/537/6/062056
Примечания : Cited References: 8
Предметные рубрики: Chemical, Ecological and Power Engineering
Аннотация: Among the new coal technologies the burning of low-grade coal in the form of coal-water slurry fuel (CWSF) is of a great interest. The basis of CWSF is a highly concentrated coal-water slurry consisting of finely ground coal, water or other liquid and plasticizing agents. The development of CWSF technology is highly relevant for solving global problems of resource conservation and ecology. The study is dedicated to CWSF properties with respect to Kansk-Achinsk coal and water. This paper presents the results of the influence of CWSF's preliminary cavitation water treatment on the combustion dynamics of fuel, (including the features of the combustion temperature trends, delayed ignition time and time of complete combustion) and on its environmental characteristics. A rotary-type hydrodynamic oscillator at high angular velocity (10000 rpm) was used in supercavitation mode. It is shown that the technology of cavitation water treatment leads to a change in the dynamics of CWSF's combustion and to an additional decrease in NOx emissions by 1.6 times, CO2 by 1.3 times.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tarasov I. A., Smolyarova T. E., Nemtsev I. V., Yakovlev I. A., Volochaev M. N., Solovyov L. A., Varnakov S. N., Ovchinnikov S. G.
Заглавие : Tailoring the preferable orientation relationship and shape of α-FeSi2nanocrystals on Si(001): The impact of gold and the Si/Fe flux ratio, and the origin of α/Si boundaries
Место публикации : CrystEngComm. - 2020. - Vol. 22, Is. 23. - P.3943-3955. - ISSN 14668033 (ISSN), DOI 10.1039/d0ce00399a
Примечания : Cited References: 52. - The experimental part of the reported study was funded by the Russian Science Foundation, project no. 16-13-00060-Π. Theoretical analysis of the ORs of the α-FeSi2 nanocrystals grown was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science via research project No. 18-42-243013. We also acknowledge the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” for support with carrying out the microscopic investigations. I. A. Tarasov personally thanks M. A. Visotin for continuous fruitful discussion about the energetics of the formation of the α-FeSi2 nanocrystals
Аннотация: The growth of α-FeSi2 nanocrystal ensembles on gold-activated and gold-free Si(001) surfaces at different Si/Fe flux ratios via molecular beam epitaxy is reported. The study reveals that the utilisation of gold as a catalyst regulates the preferable orientation relationship (OR) of the nanocrystals to silicon and their morphology at a given Si/Fe flux ratio. α-FeSi2 free-standing crystals with continuously tuned sizes from 30 nm up to several micrometres can be grown with an α(001)//Si(001) basic OR under gold-assisted conditions and an α(111)//Si(001) OR under gold-free growth conditions on a Si(001) surface. The preferred morphology of nanocrystals with a particular OR can be altered through changes to the Si/Fe flux ratio. Herein, the microstructure and basic OR between the silicide nanocrystals and the silicon substrate, and the formation of nanocrystal facets were analysed in detail with the help of microscopic techniques and simulation methods based on the analysis of near coincidence site (NCS) distributions at silicide/silicon interfaces. On the basis of the simulations used, we managed to reveal the nature of the interfaces observed for the main types of α-FeSi2 nanocrystals grown. Three types of interfaces typical for nanoplates with an α(001)//Si(001) basic OR, which are (i) stepped, (ii) stressed, and (iii) flat, are explained based on the tendency for the NCS density to increase at the interface. The results presented reveal the potential for the bottom-up fabrication of α-FeSi2 nanocrystals with tuned physical properties as potentially important contact materials and as building blocks for future nanoelectronic devices.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vtyurin A. N., Gerasimova J. V., Afanasiev E. P., Krylov A. S.
Заглавие : Raman Scattering Study of Carbon Impact Structures from Popigai Astrobleme
Коллективы : Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина, "Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials", International conference (2014 ; 14-17 July; Ekaterinburg, Russa)
Место публикации : International conference «Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials» (PFM-2014): Abstract book. - 2014. - Ст.I-05. - P.28
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Morozov E. V., Shabanova O. V., Falaleev O. V.
Заглавие : MRI Comparative Study of Container Geometry Impact on the PMMA Spheres Sedimentation
Место публикации : Appl. Magn. Reson. - 2013. - Vol. 44, Is. 5. - P.619-636. - ISSN 0937-9347, DOI 10.1007/s00723-012-0432-8
Примечания : Cited References: 31
Предметные рубрики: OPAL PHOTONIC CRYSTALS
SUSPENSIONS
PARTICLES
VELOCITY
Аннотация: Nuclear magnetic resonance (NMR) imaging results are presented for the comparative study of sedimentation of the polymethylmethacrylate colloidal suspensions with spherical particle diameters of 475, 350 and 255 nm. The time evolution of the particle volume fraction in the sedimenting system, velocity of the fluid/suspension interface, interface broadening, and sediment growth velocity are measured against the system concentration as well as the container geometry. Using the experimental data the hindered settling function is evaluated. The influence of the container geometry on the parameters defining the hindered settling function in different approaches is evaluated for the first time. The limiting value of the particle diameter is estimated at which the container geometry has no impact any longer. This effect can be explained by the microscale structure persisting at low Peclet numbers. In addition, the influence of the container geometry on interface broadening and sediment formation for different particle diameters and volume fractions is studied. Spontaneous sediment packing induced by a modified container geometry has been found. NMR imaging has proven to be a highly efficient research tool for studying sedimentation at low Peclet numbers.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Morozov E. V., Il’ichev A. V., Bouznik V. M.
Заглавие : Magnetic resonance imaging study of water absorption of polymer composite materials subjected to mechanical and temperature impact
Колич.характеристики :9 с
Место публикации : Russ. J. Phys. Chem. B. - 2023. - Vol. 17, Is. 6. - P.1361-1369. - ISSN 19907931 (ISSN), DOI 10.1134/S1990793123060064. - ISSN 19907923 (eISSN)
Примечания : Cited References: 18. - The research was carried out as part of a state assignment of the Institute of Chemistry and Chemical Technology of the Siberian Branch of the Russian Academy of Sciences (project no. 0287-2021-0012) using the equipment of the Krasnoyarsk Regional Center for Collective Use of the Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences"
Аннотация: The results of a study of water absorption processes by samples of polymer composite materials (PCMs) based on fiberglass, subjected to low-speed impact with controlled impact energy and alternating temperature cycling are presented. Using magnetic resonance imaging (MRI), the distribution of absorbed water in the fiberglass structure is visualized and the dynamics of its accumulation in various areas of the sample are studied. It is found that mechanical impact leads to a nonuniform distribution of the absorbed water in the samples and a significant accumulation of free water in the areas of destruction and adjacent layers in the event of a violation of the integrity of the outer layer of the material. It is shown that cyclic alternating temperature effects do not lead to a noticeable change in the water absorption processes and are comparable in effect to mechanical nondestructive impacts. The results obtained using MRI are in close agreement with the data of traditional weight measurements, which shows the effectiveness of the method in diagnosing defects and mechanical damage to PCMs exposed to the humid environment.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Muzalevskiy K. V.
Заглавие : Impact of a freezing topsoil on determining the Arctic tundra surface deformation using InSAR
Коллективы : International Siberian Conference on Control and Communications
Место публикации : Int. Sib. Conf. on Control and Communicat.: Proc.: IEEE, 2013. - Ст.6693624. - ISSN 978-1-4799-1062-5, DOI 10.1109/SIBCON.2013.6693624. - ISSN 978-147991060-1
Примечания : Cited References: 8
Ключевые слова (''Своб.индексиров.''): sar interferometry (insar)--smap--alos--permafrost--arctic tundra soil--active layer--freezing--thawing--soil temperature
Аннотация: In this paper, we study the effect of the layered structure of the active topsoil of the Arctic tundra during freezing on the error of determining surface deformation. A simple Bragg scattering model was used for surface scattering modeling. The simulation was performed in the L-band for future radar missions SMAP and ALOS-2. The soil permittivity is calculated using the temperature-dependent generalized refractive mixing dielectric model for the organic rich soil sample collected in North Slope, Alaska (68 degrees 38'N, 149 degrees 35'W). This model predicts the complex dielectric constant of moist soil both thawed and frozen at temperatures from -30 degrees C to +25 degrees C and moistures from 0 to 0.94 g/g. It is shown that the error of determining soil surface deformation, induced by processes of freezing of the permafrost active layer, does not exceed 1.5 cm.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Narkevich N., Vlasov I., Volochaev M. N., Gomorova Y., Mironov Y., Panin S., Berto F., Maksimov P., Deryugin E.
Заглавие : Low-temperature deformation and fracture of Cr-Mn-N stainless steel: Tensile and impact bending tests
Место публикации : Metals. - 2023. - Vol. 13, Is. 1. - Ст.95. - ISSN 20754701 (eISSN), DOI 10.3390/met13010095
Примечания : Cited References: 41. - The research was funded by RSF, project No. 22-29-00438. The low-temperature tensile tests were carried out in accordance with the state assignment for the ISPMS SB RAS, project No. FWRW-2021-0009
Аннотация: The paper presents the results of tensile and impact bending tests of 17%Cr-19%Mn-0.53%N high-nitrogen austenitic stainless steel in temperatures ranging from −196 to 20 °C. The steel microstructure and fracture surfaces were investigated using transmission and scanning electron microscopes, as well as X-ray diffraction analysis. The steel experiences a ductile-to-brittle transition (DBT); however, it possessed high tensile and impact strength characteristics, as well as the ductile fracture behavior at temperatures down to −114 °C. The correspondence between γ–ε microstructure and fracture surface morphologies was revealed after the tensile test at the temperature of −196 °C. In this case, the transgranular brittle and layered fracture surface was induced by ε-martensite formation. Under the impact bending test at −196 °C, the brittle intergranular fracture occurred at the elastic deflection stage without significant plastic strains, which preceded a failure due to the high internal stresses localized at the boundaries of the austenite grains. The stresses were induced by: (i) segregation of nitrogen atoms at the grain boundaries and in the near-boundary regions, (ii) quenching stresses, and (iii) reducing fcc lattice volume with the test temperature decrease and incorporation of nitrogen atoms into fcc austenite lattice. Anisotropy of residual stresses was revealed. This was manifested in the localization of elastic deformations of the fcc lattice and, consequently, the stress localization in 100-oriented grains; this is suggested to be the reason of brittle cleavage fracture.
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17.

Вид документа : Однотомное издание
Шифр издания :
Автор(ы) : Edelman I. S., Ovchinnikov S. G., Thakur A., Thakur P.
Заглавие : Impact of nano-biomaterials on the world
Колич.характеристики :34 pp.
Место публикации : Integrated nanomaterials and their applications/ ed.: D. Suhag [et al.]: Springer, 2023. - Chapt. 22. - P.1-34
Примечания : Cited References: 77
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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Tarasov I. A., Visotin M. A., Varnakov S. N., Ovchinnikov S. G., Farle M.
Заглавие : Growth of α-FeSi2 nanocrystals on silicon surface: the impact of gold and the Si/Fe flux ratio, the origin and the prediction of α/Si orientation relationships and interface structures
Коллективы : International workshop on functional MAX-materials, Kirensky Institute of Physics
Место публикации : International workshop on functional MAX-materials (1st FunMax). - 2020. - P.11
Примечания : Cited references: 2. - The study was carried out with the financial support of the Government of the Russian Federation within the framework of a grant for the creation of world-class laboratories (Agreement No. 075-15-2019-1886)
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tarasov A. S., Visotin M. A., Varnakov S. N., Ovchinnikov S. G.
Заглавие : Growth of α-FeSi2 nanocrystals on silicon surface: the impact of gold and the Si/Fe flux ratio, the origin and the prediction of α/Si orientation relationships and interface structures
Коллективы : International Online Workshop on the properties of Functional MAX-materials, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : 1st FunMAX Workshop 2020: Book of Abstracts/ , Ин-т физики им. Л.В. Киренского. - 2020. - P11
Примечания : Cited References: 2. - The study was carried out with the financial support of the Government of the Russian Federation within the framework of a grant for the creation of world-class laboratories (Agreement No. 075-15-2019-1886).
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Khalyapin D. L., Kim J., Stolyar S. V., Turpanov I. A., Kim P. D., Kim I.
Заглавие : Formation of 4H-closely packed structure in thin films of metastable nanocrytalline Co13Cu87 alloy
Разночтения заглавия :авие SCOPUS: Formation of 4H-closely packed structure in thin films of metastable nanocrystalline Co13Cu87 alloy
Место публикации : Solid State Commun. - 2003. - Vol. 128, Is. 6-7. - P.209-212. - ISSN 0038-1098, DOI 10.1016/j.ssc.2003.08.018
Примечания : Cited References: 10
Предметные рубрики: MAGNETORESISTANCE
Ключевые слова (''Своб.индексиров.''): nanocrystalline materials--metals--metastable solid solution--ion impact--metals--nanocrystalline materials--metastable solid solution--ion impact--crystal lattices--nanostructured materials--solid solutions--thin films--ion polishing--cobalt alloys
Аннотация: The crystal structure of the thin films of metastable Co13Cu87 alloy prepared by magnetron sputtering was investigated by transmission electron microscope. As-deposited films have a nanocrystal structure with an fcc lattice. As a result of the prolonged ion polishing with a beam of Ar ions with the energy of 4.7 keV, the four-layer 4H dhcp structure was formed. (C) 2003 Elsevier Ltd. All rights reserved.
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