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Frontiers of physics 2016年第5期11卷 57-78页

作者： V. R. Shag.nyan A. Z. Msezane g. S. Japaridze k. g. popov V. A. k.odel Petersburg.Nuclear Physics Institute NRC Kurchatov Institute Gatchina 188300 Russia Clark.Atlanta University Atlanta GA 30314 USA k.mi Science Center Ural Division RAS Syktyvkar 167982 Russia Russian Research Centre k.rchatov Institute Moscow 123182 Russia McDonnell Center for the Space Sciences & Department of Physics Washington University St. Louisa MO 63130 USA

The aim of this review paper is to expose a new state of matter exhibited by strong.y correlated Fermi systems represented by various heavy-fermion （HF） metals, two-dimensional liquids lik. 3He, compounds with quantum spin liquids, quasicrystals, and systems with one-dimensional quantum spin liquid. We name these various systems HF compounds, since they exhibit the behavior typical of HF metals. In HF compounds at zero temperature the unique phase transition, dubbed throug.out as the fermion condensation quantum phase transition （FCQPT） can occur; this FCQPT creates flat bands which in turn lead to the specific state, k.own as the fermion condensate. Unlimited increase of the effective mass of quasiparticles sig.ifies FCQPT; these quasiparticles determine the thermodynamic, transport and relaxation properties of HF compounds. Our discussion of numerous salient experimen- tal data within the framework.of FCQPT resolves the mystery of the new state of matter. Thus, FCQPT and the fermion condensation can be considered as the universal reason for the non-Fermi liquid behavior observed in various HF compounds. We show analytically and using.arg.ments based completely on the experimental g.ounds that these systems exhibit universal scaling.behavior of their thermodynamic, transport and relaxation properties. Therefore, the quantum physics of different HF compounds is universal, and emerg.s reg.rdless of the microscopic structure of the compounds. This uniform behavior allows us to view it as the main characteristic of a new state of matter exhibited by HF compounds.

关键词： quantum phase transition flat bands systems quantum spin liquids heavy fermions effects scaling.behavior new state of matter non-Fermi-liquid states strong.y correlated electron quasicrystals thermoelectric and thermomag.etic

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Scaling.behavior of the thermopower of the archetypal heavy-fermion metal YbRh2Si2

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Frontiers of physics 2016年第2期11卷 89-95页

作者： V. R. Shag.nyan A. Z. Msezane g. S. Japaridze k. g. popov J. W. Clark.V. A. k.odel Petersburg.Nuclear Physics Institute NRC Kurchatov Institute Gatchina 188300 Russia Clark.Atlanta University Atlanta GA 30314 USA k.mi Science Center Ural Division RAS Syktyvkar 167982 Russia Department of Physics St. Petersburg State University Russia McDonnell Center for the Space Sciences 8J Department of Physics Washington University St. Louis MO 63130 USA Centro de Ciencias Matemdticas Universidade de Madeira 9000-390 Funchal Madeira Portugal Russian Research Center k.rchatov Institute Moscow 123182 Russia

We reveal and explain the scaling.behavior of the thermopower S/T exhibited by the archetypal heavy-fermion （HF） metal YbRh2Si2 under the application of mag.etic field B at temperature T. We show that the same scaling.is demonstrated by different HF compounds such as/3-YbA1B4 and the strong.y correlated layered cobalt oxide [BiBa0.66k..3602]CoO2. Using.YbRh2Si2 as an example, we demonstrate that the scaling.behavior of SIT is violated at the antiferromag.etic phase transition, while both the residual resistivity Po and the density of states, N, experience jumps at the phase transition, causing.the thermopower to mak. two jumps and chang. its sig.. Our elucidation is based on flattening.of the sing.e-particle spectrum that profoundly affects Po and N. To depict the main features of the SIT behavior, we construct a T-B schematic phase diag.am of YbRh2Si2. Our calculated SIT for the HF compounds are in g.od ag.eement with experimental facts and support our observations.

关键词： thermoelectric and thermomag.etic effects quantum phase transition flat bands,non-Fermi-liquid states strong.y correlated electron systems heavy fermions

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Current self-limitation in a transverse nanosecond discharg. with a slotted cathode

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Plasma Science and Technolog. 2017年第3期19卷 69-74页

作者： N A ASHURBEk.V k.O IMINOV O A popov g.S SHAk.SINOV Dag.stan State University Faculty of Physics 43a Gadjieva Street Makhachkala 367002 Russia Moscow Power Eng.neering.Institute Krasnokazal'mennaya 14 Moscow 111250 Russia

A hig.-voltag. transverse pulsed nanosecond discharg. with a slotted hollow cathode was found to be a source of hig.-energ. （few k.） ribbon electron beams. Conditions for the formation and extinction of electron beams were experimentally studied in discharg.s in helium at pressures of 1-100 Torr. It was found that interaction of fast electrons with a non-uniform electric field near the slotted cathode led to limitation of the mag.itude of the discharg. current. A physical model was developed to describe the discharg. current self-limitation that was in satisfactory ag.eement with the experimental results. Some technical solutions that are expected to increase the upper current limits in transverse nanosecond discharg. are discussed.

关键词： nanosecond discharg. electron beams upper current limitation slotted cathode

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Active control of friction by transverse oscillations

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Friction 2019年第1期7卷 74-85页

作者： J.BENAD k.NAk.NO V.L.popov M.popov Technische Universit?t Berlin Yok.hama National University National Research Tomsk.Polytechnic University National Research Tomsk.State University

The present paper is devoted to a theoretical analysis of sliding.friction under the influence of in-plane oscillations perpendicular to the sliding.direction. Contrary to previous studies of this mode of active control of friction, we consider the influence of the stiffness of the tribolog.cal contact in detail and show that the contact stiffness plays a central role for small oscillation amplitudes. In the present paper we consider the case of a displacement-controlled system, where the contact stiffness is small compared to the stiffness of the measuring.system. It is shown that in this case the macroscopic coefficient of friction is a function of two dimensionless parameters— a dimensionless sliding.velocity and dimensionless oscillation amplitude. In the limit of very larg. oscillation amplitudes, k.own solutions previously reported in the literature are reproduced. The reg.on of small amplitudes is described for the first time in this paper.

关键词： sliding friction in-plane oscillation contact stiffness coefficient of friction active control of friction

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g.zeau–k.auder coherent states examined from the viewpoint of diag.nal ordering.operation technique

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Chinese Physics B 2016年第7期25卷 114-123页

作者： Dusan popov Romeo Neg.ea Miodrag.popov Politehnica University Timisoara Department of Physical Foundations of Engineering 300223 Timisoara Romania Politehnica University of Timisoara Department of Mathematics 300006 Timisoara Romania politehnica University Timisoara Department of Architecture and Urban Planning 300223 Timisoara Romania

In this paper we investig.te the g.zeau–k.auder coherent states using.a newly introduced diag.nal ordering.operation technique, in order to examine some of the properties of these coherent states. The results coincide with those obtained from other purely alg.braic methods, but the calculations are g.eatly simplified. We apply the g.neral theory to two cases of g.zeau–k.auder coherent states： pseudoharmonic as well as the Morse oscillators.

关键词： coherent states operator technique density operator

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Reduction of friction by normal *** of contact stiffness

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Friction 2017年第1期5卷 45-55页

作者： M.popov V.L.popov N.V.popov Berlin University of Technolog. Berlin 10623 GermanyTomsk Polytechnic University Tomsk 634050 RussiaTomsk State University Tomsk 634050 Russia Berlin University of Technolog. Berlin 10623 Germany

The present paper is devoted to a theoretical analysis of sliding.friction under the influence of oscillations perpendicular to the sliding.*** contrast to previous work. we analyze the influence of the stiffness of the tribolog.cal contact in detail and also consider the case of larg. oscillation amplitudes at which the contact is lost during.a part of the oscillation period,so that the sample starts to 'jump'.It is shown that the macroscopic coefficient of friction is a function of only two dimensionless parameters-a dimensionless sliding.velocity and dimensionless oscillation *** function in turn depends on the shape of the contacting.*** the present paper,analysis is carried out for two shapes:a flat cylindrical punch and a parabolic *** we consider 'stiff systems',where the contact stiffness is small compared with the stiffness of the *** role of the system stiffness will be studied in more detail in a separate paper.

关键词： sliding.friction out-of-plane oscillation contact stiffness coefficient of friction active control of friction

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Nitrog.n and Carbon Isotope Data of Olenek.an to Anisian Deposits from k.menushk./South Primorye, Far-Eastern Russia and Their Palaeoenvironmental Sig.ificance

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Journal of Earth Science 2018年第4期29卷 837-853页

作者： Yuri D Zak.arov Micha Horacek.Alexander M popov Liana g.Bondarenk. Far Eastern g.olog.cal Institute of Russian Academy of Sciences (Far Eastern Branch) Stoletiya Prospect 159 Vladivostok 690022 Russia BLT Wieselburg Research Center HBLFA Francisco-Josephinum Wieselburg 3250 Austria Institute of Lithospheric Research Vienna University Vienna 1090 Austria

The k.menushk. Formation, exposed in the northern part of South Primorye （k.mennshk.-1 and k.menushk.-2 sections）, is one of the few localities in the world with richly fossiliferous Lower-Upper Olenek.an sedimentary successions. Lower to Middle Triassic ammonoid-, brachiopod- and conodont-bearing.silty-clayey deposits of the k.menushk.-1 and k.menushk.-2 sections have been isotope-g.ochemically investig.ted in detail. As a result, these sections, tog.ther with the previously investig.ted Abrek.Section, exposed in the southern part of South Primorye, provide almost complete ^15Non- and ^13Corg. records for the Lower Triassic of this reg.on. Nine N- isotope intervals and the five neg.tive C-isotope excursions, reflecting. apparently, unstable climatic and hydrolog.cal conditions, have been disting.ished in the Lower Triassic of South Primorye. On the basis of the new C-isotope data the Mesohedenstroemia bosphorensis Zone （upper part）, Shimansk.ites shimansk.i and Neocolumbites insig.is zones of South Primorye are correlated now with the Lower Smithian part of the Yink.ng.Formation, the Upper Smithian part of the Helong.han Formation and the Middle Spathian part of the Nanling.u Formation in South China, respectively, as has been observed in the Abrek. k.menushk.-2, West Ping.ing.han and Majiashan sections.

关键词： Triassic N- and C-isotopes palaeoclimatolog. bio- and chemostratig.aphy Pri- morye Russia.

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Multi-scale polarisation phenomena

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Lig.t(Science & Applications) 2016年第1期5卷 810-818页

作者： Vladimir k.lashnik.v Serg.y V Serg.yev g.nnar Jacobsen Serg.i popov Serg.i k.Turitsyn AIPT Aston UniversityBirminghamWest Midlands B47ETUK Acreo Electrum 236SE-16440KistaSweden Royal Institute of Technolog.(k.H) SE-1640StockholmSweden

Multi-scale methods that separate different time or spatial scales are among.the most powerful techniques in physics,especially in applications that study nonlinear systems with *** the time scales(noise and perturbation)are of the same order,the scales separation becomes ***,the multi-scale approach has to be modified to characterise a variety of noise-induced ***,based on stochastic modelling.and analytical study,we demonstrate in terms of the fluctuation-induced phenomena and Hurst R/S analysis metrics that the matching.scales of random birefring.nce and pump–sig.al states of polarisation interaction in a fibre Raman amplifier results in a new random birefring.nce-mediated phenomenon,which is similar to stochastic *** observed phenomenon,apart from the fundamental interest,provides a base for advancing.multi-scale methods with application to different coupled nonlinear systems rang.ng.from lasers(multimode,mode-lock.d,random,etc.)to nanostructures(lig.t-mediated conformation of molecules and chemical reactions,Brownian motors,etc.).

关键词： fibre Raman amplifier multi-scale methods polarisation stochastic calculations

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Reduction of friction by normal oscillations.Ⅱ.In-plane system dynamics

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Friction 2017年第2期5卷 534-535,536页

作者： Xinyu MAO Valentin L.popov Jasmink. STARCEVIC Mik.ail popov Technische Universit(a)t Berlin Berlin 10623 GermanyTsinghua University Beijing 100084 China Technische Universit(a)t Berlin Berlin 10623 GermanyTomsk Polytechnic University Tomsk 634050 RussiaTomsk State University Tomsk 634050 Russia Technische Universit(a)t Berlin Berlin 10623 GermanyTomsk State University Tomsk 634050 Russia

The influence of out-of-plane oscillations on friction is a well-k.own phenomenon that has been studied extensively with various experimental methods,e.g.,pin-on-disk.***,existing.theoretical models have yet achieved only qualitative correspondence with *** we arg.e that this may be due to the system dynamics (mass and tang.ntial stiffness) of the pin or other system components being.*** paper builds on the results of a previous study [19] by tak.ng.the stiffness and resulting.dynamics of the system into *** main g.verning.parameters determining.macroscopic friction,including.a dimensionless oscillation amplitude,a dimensionless sliding.velocity and the relation between three characteristic frequencies (that of externally excited oscillation and two natural oscillation frequencies associated with the contact stiffness and the system stiffness) are *** the limiting.cases of a very soft system and a very stiff system,our results reproduce the results of previous *** between these two limiting.cases there is also a resonant case,which is studied here for the first *** resonant case is notable in that it lack. a critical sliding.velocity,above which oscillations no long.r reduce *** obtained for the resonant case are qualitatively supported by experiments.

关键词： sliding.friction out-of-plane oscillation stiffness system dynamics macroscopic friction coefficient

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Non-adhesive and adhesive contacts of an elastic quarter-or eig.th-space with freely sliding.sides

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Friction 2024年第9期12卷 2052-2063页

作者： Qiang.LI Valentin L.popov Technische Universität Berlin Berlin 10623Germany

The contact of an elastic quarter-or eig.th-space is studied under the condition that the movement of the side surface of the quarter-space is constrained:It can slide freely along.the plane of the side surface but its normal movement is block.d(for example,by a rig.d wall).The solution of this contact problem can be easily achieved by additionally applying.a mirrored load to an elastic ***-adhesive contact and the Johnson–k.ndall–Roberts(Jk.)-type adhesive contact between a rig.d sphere and an elastic quarter-space under such a boundary condition is numerically simulated using.the fast Fourier transform(FFT)-assisted boundary element method(BEM).Contacts of an elastic eig.th-space are investig.ted using.the same *** on the position of the sphere relative to the side edg.,different contact behavior is *** the case of adhesive contact,the force of adhesion first increases with increasing.the distance from the edg. of the quarter-space,achieves a maximum,and decreases further to the Jk.-value in larg. distance from the *** enhancement of the force of adhesion compared to the half-space-contact is associated with the pinning.of the contact area at the *** provide the maps of the force of adhesion and their analytical approximations,as well as pressure distributions in the contact plane and inside the quarter-/eig.th-space.

关键词： quarter-space eig.th-space adhesion edg. effect boundary element method(BEM)

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