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Автор(ы) : Mamalis D., Manolakos D.E., Kladas A.G., Koumoutsos A.K., Ovchinnikov S. G.
Заглавие : Electromagnetic forming of aluminum alloy sheet using a grooved die: numerical modeling
Место публикации : Phys. Met. Metallogr. - Vol. 102, Suppl. 1, Chapter 13. - P.S90-S93. - DOI 10.1134/S0031918X06140237
Примечания : Cited References: 3
Аннотация: A commercial ANSYS FE Code is employed for the simulation of the electromagnetic sheet-metal forming into a grooved die. An industrial pancake coil is considered as the forming tool. The deformation characteristics of the sheet (workpiece) as well as the electromagnetic parameters of the high-energy process are calculated numerically. An equivalent-circuit method is used to validate the electromagnetic model. The results from both analyses are in good agreement.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zagorskiy D.L., Semenov S. V., Komogortsev S. V., Balaev D. A., Doludenko I.M., Panina L.V.
Заглавие : Magnetization processes in two-dimensional arrays of iron nanowires
Колич.характеристики :8 с
Место публикации : J. Magn. Magn. Mater. - 2024. - Vol. 595. - Ст.171573. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2023.171573. - ISSN 18734766 (eISSN)
Примечания : Cited References: 48. - This work was supported by Russian Scientific Foundation (RSF) Grant 22-22-00983
Аннотация: Arrays of iron nanowires (NWs) obtained by template-assisted electrodeposition constitute a promising composite material characterized by a combination of high magnetization in the filler and perpendicular magnetic anisotropy. The properties of these composites arise from the interplay between the behavior of individual NWs and their magnetostatic interactions. In this study, we investigated NW arrays with identical wire diameters but varying spatial arrangements. Major hysteresis loops were studied under various field directions relative to the NW axis. Key parameters such as the slope of the magnetization curve, saturation magnetization, and coercive force were quantified. Additionally, FORC (First Order Reversal Curve) measurements were conducted with the field oriented longitudinally with respect to the NW, offering insights into the inhomogeneity of the demagnetizing field influenced by the NW array's configuration. In the sample with the highest NW density, we observed isotropic behavior of the effective demagnetizing field, and we proposed an explanation for this phenomenon using the effective media approach. Micromagnetic simulations revealed that the magnetic behavior of individual NWs with a 100 nm diameter can be described as an interchange between volumes characterized by vortex and uniform magnetization patterns. Calculations of the demagnetizing field using the effective medium model demonstrated excellent agreement with experimental data across arrays featuring different NW densities. Remarkably, the quantitative consistency of coercive field values obtained from micromagnetic simulations and experimental measurements in the range of angles from 0° to 45° for the studied samples underscores the structural homogeneity of the obtained NWs.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kostyukov A. S., Isaev I. L., Ershov A. E., Gerasimov V. S., Polyutov S. P., Karpov S. V.
Заглавие : Part II. Nanobubbles around plasmonic nanoparticles in terms of modern simulation modeling: what makes them kill the malignant cells?
Коллективы : Ministry of Science and High Education of Russian Federation [FSRZ-2020-0008]; RFBRRussian Foundation for Basic Research (RFBR); Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science [20-42-240003]
Место публикации : J. Phys. D. - 2022. - Vol. 55, Is. 17. - Ст.175402. - ISSN 0022-3727, DOI 10.1088/1361-6463/ac4c1f. - ISSN 1361-6463(eISSN)
Примечания : Cited References: 49. - The research was supported by the Ministry of Science and High Education of Russian Federation (Project No. FSRZ-2020-0008), and was funded by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, Project No. 20-42-240003
Предметные рубрики: STRESS WAVES
LASER
MEMBRANE
DAMAGE
DEATH
LYSIS
Аннотация: We have established numerically the physical pattern and conditions for formation of nanosized bubbles in aqueous medium around biocompatible plasmonic nanoparticles (NPs) selectively bound to the membrane of the malignant cells by means of DNA-aptamers under the action of picosecond laser radiation. The results obtained are based on the finite volume method and hydrodynamic models underlying the ANSYS Fluent package with extended capabilities. We have found the main features and previously unknown dominant factors of the damage effect on the cell membrane at the moment of the bubble nucleation around the plasmonic NPs of different types taking into account the influence of the closely located membrane. Information on the kinetics of spatial distribution of pressure, temperature and the relative proportion of vapor in the 'nanoparticle-membrane-medium' system have been obtained. The attention is drawn to the advantages of using biocompatible, perfectly absorbing core–shell plasmonic NPs for anti-tumor therapy characterized by an increased mechanical effect on malignant cell membranes at lower laser radiation intensity and the spectral position of their plasmon resonance (λ = 700 nm) in the hemoglobin transparency range. This ensures penetration of laser radiation deep into tissues. The paper is provided with an extensive review of key publications and the state-of-art in this area.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gorev M. V., Bondarev V. S., Flerov I. N., Bormanis K., Birks E.
Заглавие : T − E phase diagrams and electrocaloric effect in PNN-PT solid solutions
Место публикации : J. Alloys Compd. - 2022. - Vol. 927. - Ст.167032. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2022.167032
Примечания : Cited References: 40. - The authors are thankful to Dr. Anna Kalvane (Institute of Solid State Physics, University of Latvia) for preparation and characterization of the samples. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors
Аннотация: Using the sixth-order free energy expansion of the Landay thermodynamic potential, T − E phase diagrams and the electrocaloric effect (ECE) in solid solutions (1-x)Pb(Ni1∕3Nb2∕3)O3-xPbTiO3 (PNN-PT) were studied under an electric field along the crystallographic directions [001], [101] and [111]. The composition of the samples, temperature range, as well as magnitude and direction of the electric field significantly affect the sequence of phase transitions, stability of various crystalline phases and electrocaloric properties. Direct measurements of the intensive ECE in the 0.8PNN-0.2PT compound were carried out by the method of adiabatic calorimetry at electric field strength E = 6 kV/cm. The large electrocaloric coefficient ΔT∕ΔE = 10 μK ⋅ cm/kV indicates that this compound and other PNN-PT solutions are promising for application as solid-state refrigerants.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Буханов, Евгений Романович
Заглавие : Моделирование оптических свойств на основе биологических структур
Коллективы : "Физика.Технологии. Инновации", международная молодежная научная конференция, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина
Место публикации : IX Международная молодежная научная конференция "Физика. Технологии. Инновации" (ФТИ-2022): тезисы докладов. - Екатеринбург, 2022. - Секция: Биоинженерия и биотехнологии. - С. 993-994
Примечания : Библиогр.: 5
Аннотация: Numerical calculations of the optical characteristics were made of the plant chloroplast structure based on thylakoids and the stromal distance between grana. The results showed that even on such small structures there are resonance phenomena in the visible wavelength range.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Satsuk S. A., Komogortsev S. V.
Заглавие : Micromagnetic modeling of the polycrystalline structure effect to the hysteresis loop in ferromagnetic nanowire
Коллективы : Dynamic Systems and Computer Science: Theory and Applications
Место публикации : 2020 Dynamic Systems and Computer Science: Theory and Applications (19-22 October 2020 ; Irkutsk, Russian Federation). Journal of Physics: Conference Series. - 2021. - Vol. 1847, Is. 1. - Ст.012045. - , DOI 10.1088/1742-6596/1847/1/012045
Примечания : Cited References: 32. - This work was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project 18-42-240006
Аннотация: Extensive micromagnetic simulation results of the hysteresis loops in ferromagnetic nanowire with randomly oriented crystallites ordered in one chain is presented. Three main contributions to the magnetic energy of the wire had been taken into account: exchange, dipole-dipole, and the magnetic anisotropy energy of the crystallite. In cases where one of the three contributions to the energy can be neglected, the numerical calculations are in good agreement with the results of the well-known, analytically studied micromagnetic problems. In the case when all three contributions are comparable, a complex non-monotonic dependence of the coercive force on the crystallite size and the magnetic anisotropy constant is observed. In order to interpret these changes, a new micromagnetic scale is introduced, which takes into account all three contributions to the magnetic energy of the wire, and performs a correct transition to the analytically studied limits, which take into accountthe competition of any two contributions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Novikov P. V., Osipova I. V., Churilov G. N., Dudnik A. I.
Заглавие : Simulation of fullerene formation in a carbon-helium plasma
Место публикации : Fuller. Nanotub. Carbon Nanostruct. - 2021. - Vol. 29, Is. 5. - P.337-342. - ISSN 1536383X (ISSN), DOI 10.1080/1536383X.2020.1842738
Примечания : Cited References: 22
Аннотация: A kinetic model of fullerene formation in the carbon-helium plasma of an arc discharge was proposed. In the model, in addition to the coagulation of carbon clusters, the cluster isomerization and their cooling with a buffer gas were taken into account. The simulation results of the fullerene formation are in qualitatively agreement with the experimental data, i.e., the fraction of higher fullerenes increases at high pressures in the fullerene mixture.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shchugoreva I. A., Artyushenko P. V., Tomilin F. N., Morozov D. I., Mironov V. A., Moryachkov R. V., Kichkailo A. S.
Заглавие : Applying joint theoretical experimental research to aptamer modeling
Место публикации : Sib. Med. Rev. - 2021. - Vol. 2021, Is. 2. - P.105-106. - ISSN 18199496 (ISSN), DOI 10.20333/2500136-2021-2-105-106; Сиб. мед. обозрение
Примечания : Cited References: 4
Аннотация: The aim of the research. In this work we studied the structure of LC-18 DNA aptamer, which exhibits specific binding to lung adenocarcinoma cells. Obtain-ing the 3D structure of the aptamer is necessary for understanding the mechanism of binding of the aptamer to the target. Therefore, the aim of the research was modeling of the LC-18 aptamer spatial structure using combination of theoretical methods: DNA folding tools, quantum-chemical calculations and molecular dynamic simulations. Material and methods. The secondary structure of the LC-18 aptamer was predicted by using OligoAnalyzer and MFold online software under the conditions typical small-angle X-ray scattering (SAXS) experiment. The molecular modeling of the aptamer was carried out using the Avogadro program. For prediction of the structure two computational methods were used: quantum-mechanical method with third-order density-functional tight-binding (DFTB3) and molecular dynamics (MD) with force fields. Results. In this paper it was shown that molecular simulations can predict structures from the SAXS experiments. OligoAnalyzer and MFold web servers have been used to generate a set of several likely models. However, more accurate calculations have showed that these models do not predict the relative importance of isomers. Meanwhile, application of quantum-chemical and molecular dynamics calculations have showed reliable molecular structures which have a small deviations from the experimental SAXS curves. Conclusion. This study demonstrates the approach for modeling 3D structures of DNA-aptamers in solution using both experimental and theoretical meth-ods. It could be very helpful in designing more efficient aptamers based on results obtained from molecular simulations.
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Вид документа : Статья из журнала
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Автор(ы) : Belyaev B. A., Boev N. M., Izotov A. V., Solovev P. N.
Заглавие : Domain structure and magnetization reversal in multilayer structures consisting of thin permalloy films separated with nonmagnetic interlayers
Коллективы : Ministry of Science and Higher EducationMinistry of Science and Higher Education, PolandEuropean Commission
Место публикации : Russ. Phys. J. - 2021. - Vol. 64, Is. 6. - P.1160-1167. - ISSN 1064-8887, DOI 10.1007/s11182-021-02436-w. - ISSN 1573-9228(eISSN)
Примечания : Cited References: 30. - This work was financially supported by the Ministry of Science and Higher Education under agreement No. 075-11-2019-054 November 22, 2019
Предметные рубрики: MICROMAGNETIC CALCULATION
MAGNETOMETER
SIMULATION
NOISE
Аннотация: Using numerical micromagnetic modeling, we have investigated the development of domain structure and magnetization reversal in multilayer thin-film structures. The permalloy (Ni80Fe20) magnetic layers had the inplane uniaxial and perpendicular magnetic anisotropy. We found that as the thickness of nonmagnetic interlayers decreases, the in-plane configuration of magnetic moments in the permalloy layers transforms from a single domain state to stripe domains, which is caused by the increase of magnetostatic interaction between layers. In structures with "thick" interlayers, even weak magnetostatic interaction enforces the neighboring single domain permalloy layers to have opposite orientations of magnetic moments. The saturation field of such samples increases linearly with the number of layers. By analyzing the dynamic characteristics of multilayers, we determined the optimum number of layers ensuring the maximum conversion efficiency of wideband microwave microstrip sensors of weak magnetic fields.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Koblischka M. R., Koblischka-Veneva A., Nouailhetas Q., Berger K., Douine B., Gokhfeld D. M.
Заглавие : Microstructural parameters for modelling of superconducting foams
Коллективы : International Workshop on Numerical Modelling of High Temperature Superconductors
Место публикации : 7th International workshop on numerical modeling of high temperature superconductors (HTS 2020): [Theses]. - 2021
Примечания : Cited References: 9
Аннотация: Modelling the mechanical and superconducting properties of superconducting, open-cell foam samples requires a proper description of their speciﬁc microstructure. For this purpose, foam samples are investigated using optical microscopy, SEM and x-ray tomography, enabling to identify the parameters important for modelling.
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