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Coupled thermo-hydro-mechanical modeling of frost heave and water migration during artificial freezing of soils for mineshaft sinking

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第2期14卷 537-559页

作者： M.Zhelnin A.Kostina a.prokhorov O.Plekhov M.Semin L.Levin Institute of Continuous Media Mechanics of the Ural Branch of the Russian Academy of Sciences Perm614013Russia Mining Institute of the Ural Branch of the Russian Academy of Sciences Perm614007Russia

Artificial freezing of water-bearing soil layers composing a sedimentary deposit can induce frost heave and water migration that affect the natural stress-strain state of the soil layers and freezing *** the present paper,a thermo-hydro-mechanical(THM)model for freezing of water-saturated soil is proposed to study the effects of frost heave and water migration in frozen soils on the formation of a frozen wall and subsequent excavation activity for sinking a vertical *** governing equations of the model are formulated relative to porosity,temperature,and displacement which are considered as primary *** relationship between temperature,pore water,and ice pressure in frozen soil is established by the Clausius-Clapeyron equation,whereas the interaction between the stress-strain behavior and changes in porosity and pore pressure is described with the poromechanics ***,constitutive relations for additional mechanical deformation are incorporated to describe volumetric expansion of soil during freezing as well as creep strain of soil in the frozen *** ability of the proposed model to capture the frost heave of frozen soil is demonstrated by a comparison between numerical results and experimental data given by a one-sided freezing *** to validate the model in other freezing conditions,a radial freezing experiment is *** the validation procedure,the model is applied to numerical simulation of artificial freezing of silt and sand layers for shaft sinking at Petrikov potash mine in *** of calculated temperature with thermal monitoring data during active freezing stage is *** analysis of deformation of unsupported sidewall of a shaft inside the frozen wall is conducted to account for the change in natural stress-strain state of soil layers induced by artificial freezing.

关键词： Artificial ground freezing(AGF) Thermo-hydro-mechanical(THM)modeling Frost effects Frozen wall Shaft sinking

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Acoustic Shock Emission in a Collision of a Drop with Water Surface

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Fluid Dynamics & Materials Processing 2020年第4期16卷 737-746页

作者： V.E.prokhorov Ishlinsky Institute for Problems in Mechanics RAS Moscow119526Russia

The collision of droplets with a water surface is being actively developed in the interests of many applied problems—transfer of matter through the ocean-atmosphere boundary,underwater acoustic noise of the marine environment,measurement of precipitation intensity,various technologies,and much *** of the research priorities is acoustic radiation,in particular,shock sound arising at the moment a drop contacts the *** impact of the drop is preceded by processes that affect the shape of the drop,because of which it noticeably deviates from the spherical *** a result,the final(contact)velocity changes–one of the most important parameters of *** study of the listed factors is carried out in this work by means of broadband acoustic measurements and high-speed video recording.

关键词： Droplet impact acoustic emission shape final velocity crosscorrelation

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Temperature dependence of LiNbO3 dislocation density in the near-surface layer

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Chinese Optics Letters 2022年第6期20卷 40-46页

作者： Oksana Semenova Aleksei Sosunov Nikolai prokhorov Roman Ponomarev Department of Nanotechnology and Microsystems Engineering Perm State UniversityPerm 614990Russia Perm Federal Research Center of the Ural Branch of the Russian Academy of Sciences Perm 614990Russia

Density of dislocations in the near-surface layer was investigated in X-cut LiNbO_(3) depending on thermal annealing in the temperature range of 400℃–600℃.A dynamic model of randomly distributed dislocations has been developed for LiNbO_(3) by using X-ray *** experimental results showed that the dislocation density of the near-surface layer reached the minimum at the thermal annealing temperature of 500℃,with the analysis being performed when wet selective etching and X-ray diffraction methods were *** concluded that homogenization annealing is an effective technique to improve the quality of photonic circuits based on LiNbO_(3).The results obtained are important for optical waveguides,LiNbO_(3)-on-insulator-based micro-photonic devices,electro-optical modulators,sensors,etc.

关键词： lithium niobate etching pits near-surface layer density of dislocations annealing X-ray diffraction

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Dynamic magnetic hysteresis in a liquid suspension of acicular maghemite particles

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Particuology 2009年第6期7卷 451-458页

作者： Bronislav E.Kashevsky Sergey B.Kashevsky Igor V.prokhorov A.V.Luikov Heat and Mass Transfer Institute Belarus Academy of SciencesP.Brovka str.15Minsk 220072Belarus

This paper presents theoretical and experimental studies on the magnetodynamics and energy absorption in a dilute suspension of small ferromagnetic particles with magnetic hysteresis and mechanical mobility in an AC magnetic field. Experiments with 0.1% suspensions of acicular particles of gamma ferric oxide in solid and liquid matrices, subjected to a 430 Hz magnetic field with an intensity of up to 1200 Oe, revealed important role of particle mobility. The main qualitative and quantitative features of the phenomenon are in agreement with a model of joint magneto-mechanical dynamics of particles with a chain-of-spheres mode of incoherent magnetic reversal.

关键词： High-coercive magnetic particles Magnetic suspensions Dynamic magnetic hysteresis

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Electrical Excitation of Long-Range Surface Plasmons in PC/OLED Structure with Two Metal Nanolayers

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Nano-Micro Letters 2020年第3期12卷 69-76页

作者： Valery Konopsky Valery prokhorov Dmitry Lypenko Artem Dmitriev Elena Alieva Giovanni Dietler Sergey Sekatskii Institute of Spectroscopy Russian Academy of SciencesFizicheskaya5TroitskMoscowRussia 108840 Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences Leninsky pr.31/4MoscowRussia 119071 Laboratoire de Physique de La Matière Vivante IPHYSEcole Polytechnique Fédérale de Lausanne1015 LausanneSwitzerland

A current-driven source of long-range surface plasmons(LRSPs)on a duplex metal nanolayer is *** excitation of LRSPs was experimentally observed in a planar structure,where an organic light-emitting film was sandwiched between two metal nanolayers that served as *** achieve the LRSP propagation in these metal nanolayers at the interface with air,the light-emitting structure was bordered by a one-dimensional photonic crystal(PC)on the other *** dispersion of the light emitted by such a hybrid PC/organic-light-emitting-diode structure(PC/OLED)comprising two thin metal electrodes was obtained,with a clearly identified LRSP resonance peak.

关键词： Surface plasmons Photonic crystal waveguides Light-emitting polymers

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Audio-frequency heating of particulate magnetic systems

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China Particuology 2007年第1期5卷 84-92页

作者： B.E. Kashevsky I.V. prokhorov S.B. Kashevsky A.V. Luikov Heat and Mass Transfer Institute Belarus Academy of Sciences P. Brovka str. 15 Minsk 220072 Belarus

This paper presents theoretical and experimental studies on the magnetodynamics and energy dissipation in suspensions of small ferromagnetic particles with magnetic hysteresis and mechanical mobility in an AC magnetic field. Energy absorption by particles suspended in a solid, liquid or gas environment and subjected to high frequency magnetic fields is of great interest for cancer treatment by hyperthermia, chemical technology, biotechnology and smart materials science. Sub-micron needle-like γ-Fe2O3 particles dispersed in liquid were subjected in this study to a 430 Hz magnetic field with an intensity of up to 10^5 A/m. Dynamic magnetization loops were measured in parallel to the energy dissipated in the samples. Combined magnetomechanical dynamics of particle dispersions was simulated by using a chain-of-spheres model allowing for incoherent magnetic field reversal. In liquid dispersions, within the kilohertz frequency range, the mechanical mobility of particles does not interfere with their hysteretic magnetic reversal that makes heat release comparable to that observed with solids; for instance, in the present study using γ-Fe2O3 particles in liquid subjected to 10^4 Hz field exhibited heat release rates from 250 up to 600W oer 1 cm^3 of the dry oarticle content.

关键词： AC magnetic field Particulate materials Audio-frequency heating

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Anomalous Laterally Stressed Kinetically Trapped DNA Surface Conformations

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Nano-Micro Letters 2021年第8期13卷 263-280页

作者： Valery V.prokhorov Nikolay A.Barinov Kirill A.Prusakov Evgeniy V.Dubrovin Maxim D.Frank-Kamenetskii Dmitry V.Klinov Federal Research and Clinical Center of Physical-Chemical Medicine Malaya Pirogovskaya1aMoscow 119435Russian Federation A.N.Frumkin Institute of Physical Chemistry and Electrochemistry RASLeninsky prospect Moscow 199071 Russian Federation 3 Moscow Institute of Physics and TechnologyInstitutskiy per.9Dolgoprudny141700 MoscowRussian Federation Lomonosov Moscow State University Leninskie gory1-2Moscow 119991Russian Federation Department of Biomedical Engineering Boston University44 Cummington MallBoston MA02215USA

Up to now,the DNA molecule adsorbed on a surface was believed to always preserve its native *** belief implies a negligible contribution of lateral surface forces during and after DNA adsorption although their impact has never been ***-resolution atomic force microscopy was used to observe that stiff DNA molecules kinetically trapped on monomolecular films comprising one-dimensional periodically charged lamellar templates as a single layer or as a sublayer are oversaturated by sharp discontinuous kinks and can also be locally melted and *** argue that kink/anti-kink pairs are induced by an overcritical lateral bending stress(>30 pNnm)inevitable for the highly anisotropic 1D-1D electrostatic interaction of DNA and underlying rows of positive surface *** addition,the unexpected kink-inducing mechanical instability in the shape of the template-directed DNA confined between the positively charged lamellar sides is observed indicating the strong impact of *** previously reported anomalously low values of the persistence length of the surface-adsorbed DNA are explained by the impact of the surface-induced low-scale *** sites of the local melting and supercoiling are convincingly introduced as other lateral stress-induced structural DNA anomalies by establishing a link with DNA high-force *** results open up the study in the completely unexplored area of the principally anomalous kinetically trapped DNA surface conformations in which the DNA local mechanical response to the surface-induced spatially modulated lateral electrostatic stress is essentially *** underlying rich and complex in-plane nonlinear physics acts at the nanoscale beyond the scope of applicability of the worm-like chain approximation.

关键词： DNA surface conformations Kinetic trapping Lateral stress Periodically charged surface DNA kinks

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Conformal Evolution of Waves in the Yang-Mills Condensate: The Quasi-Classical Approach

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Journal of Modern Physics 2014年第5期5卷 209-229页

作者： Roman Pasechnik George prokhorov Grigory Vereshkov 1Research Institute of Physics Southern Federal University Rostov-on-Don Russia 2Institute for Nuclear Research of Russian Academy of Sciences Moscow Russia Research Institute of Physics Southern Federal University Rostov-on-Don Russia Theoretical High Energy Physics Department of Astronomy and Theoretical Physics Lund University Lund Sweden

We have constructed a consistent system of equations for the Yang-Mills quantum-wave fluctuations in the classical Yang-Mills condensate based on canonical quantization in the Heisenberg representation. Such a quasi-classical system has been thoroughly analyzed in the conformal limit in the linear and quasi-linear approximations, both analytically and numerically. We have found that interaction between waves and condensate triggers a significant transfer or swap of energy from the condensate to the wave modes in the SU(2) gauge theory. Remarkably, a similar energy swap effect has been found in the maximally-supersymmetric N=4 Yang-Mills theory, as well as in the two-condensate SU(4) gauge theory. Such a generic feature of Yang-Mills dynamics opens up vast phenomenological implications in ultra-relativistic Yang-Mills plasma physics.

关键词： Gauge Theories Canonical Quantization Relativistic Yang-Mills Plasma Quantum-Wave Fluctuations Classical Yang-Mills Condensate

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Study of cobalt ferrite nanosuspensions for low-frequency ferromagnetic hyperthermia

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Particuology 2008年第5期6卷 322-333页

作者： Bronislav E.Kashevsky Vladimir E.Agabekov Sergei B.Kashevsky Katsiaryna A.Kekalo Elena Yu.Manina Igor V.prokhorov Vladimir S.Ulashchik A.V.Luikov Heat and Mass Transfer Institute Belarus Academy of Sciences P.Brovka Str.15Minsk 220072Belarus Institute of Chemistry of New Materials Belarus Academy of SciencesSkoriny Str.36Minsk 220141Belarus Institute of Physiology Belarus Academy of SciencesAkademicheskaiy Str.28Minsk 220072Belarus

High-coercive cobalt ferrite nanoparticles were synthesized and studied for magnetic hyperthermia by direct injection of their suspension into a tumor and application of a strong audio-frequency magnetic field for heating. Physical （dynamic magnetic hysteresis and heat generation in both liquid and solid dispersions）, biological （toxicity and penetration of particles in therapeutic quantities into mouse tumor tissue） as well as other properties of the particles were studied. A model was developed to describe the magnetodynamics in suspensions of magnetic nanoclusters with an account for both Brownian and regular rotations, to provide understanding of observed phenomena. The experimental and theoretical techniques developed have formed a basis for controllable synthesis of the magnetic nanoparticles for low-frequency heat generation in medical and other applications.

关键词： Cobalt ferrite nanoparticles Magnetic suspensions Dynamic magnetic hysteresis Medical hyperthermia

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Main Directions and Recent Test Modeling Results of Lithium Capillary-Pore Systems as Plasma Facing Components

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Plasma Science and Technology 2004年第3期6卷 2291-2295页

作者： V.A.Evtikhin I.E.Lyublinski A.V.Vertkov E.A.Azizov S.V.Mirnov V.B.Lazarev S.M.Sotnikov V.M.Safronov A.S.prokhorov V.M.Korzhavin FSUE "Red Star"-"Prana-Center" Co Moscow Russian FSUE TRINITI Troitsk Moscow region Russian Federation RF Ministry for Atomic Energy Moscow

At present the most promising principal solution of the divertor problemappears to be the use of liquid metals and primarily of lithium Capillary-Pore Systems (CPS) as ofplasma facing materials. A solid CPS filled with liquid lithium will have a high resistance tosurface and volume damage because of neutron radiation effects, melting, splashing and thermalstress-induced cracking in steady state and during plasma transitions to provide the normaloperation of divertor target plates and first-wall protecting elements. These materials will not bethe sources of impurities inducing an increase of Z_(eff) and they will not be collected as dust inthe divertor area and in ducts. Experiments with lithium CPS under simulating conditions of plasmadisruption on a hydrogen plasma accelerator MK-200 [~ (10 - 15) MJ/m^2, ~ 50 μs] have beenperformed. The formation of a shielding layer of lithium plasma and the high stability of thesesystems have been shown. The new lithium limiter tests on an up-graded T-11M tokamak (plasma currentup to 100 kA, pulse length ~0.3 s) have been performed. Sorption and desorption of plasma-forminggas, lithium emission into discharge, lithium erosion, deposited power of the limiter areinvestigated in these experiments. The first results of experiments are presented.

关键词： lithium divertor plasma facing material

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