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Spectral and amplitude-time characteristics of crystals excited by a runaway electron beam

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Matter and Radiation at Extremes 2019年第3期4卷 42-46页

作者： V.F.Tarasenko M.I.Lomaev E.Kh.Baksht d.V.Beloplotov A.G.Burachenko d.A.sorokin E.I.Lipatov Laboratory of Optical Radiation of the Institute of High Current Electronics Tomsk 634055Russia

The generation of runaway electrons(REs)is a significant problem in tokamak installations,causing energy loss,and melting and vaporization of the walls of the vacuum *** wide deployment of Cherenkov-type detectors,in addition to other methods,is routinely used to detect high-energy *** paper focuses on the cathodoluminescence and Cherenkov radiation excited in different crystals by *** spectral energy density of Cherenkov radiation in CaF_(2)(fluorite)and diamond at various initial electron energies is calculated,taking into account the ionization losses of electron energy,the dispersion of the refractive index of these substances,and the electron energy distribution of the beam.

关键词： excited walls beam

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超高功率体放电的形成及其应用(英文)

光学精密工程 2011年第2期19卷 273-283页

作者： TARASENKO V F BAKSHT E KH BURACHENKO A G LOMAEV M I RYBKA d V SHULEPOV M A sorokin d a SHUT'KO V High Current Electronics Institute

研究了氮气中的高压体（扩散）放电特性,实验中施加的极间隙脉冲电压达数百千伏,持续时间为数纳秒,上升时间为几个纳秒,给出了实验结果。研究了氦气压强为（0.42）×10^5Pa时,从扩散形式到火花放电的放电转换过程。确定了在氮气压强下... 详细信息

研究了氮气中的高压体（扩散）放电特性,实验中施加的极间隙脉冲电压达数百千伏,持续时间为数纳秒,上升时间为几个纳秒,给出了实验结果。研究了氦气压强为（0.42）×10^5Pa时,从扩散形式到火花放电的放电转换过程。确定了在氮气压强下电流幅度与逃逸电子束电流脉宽的关系。结果表明,导致隙间扩散放电的超短雪崩电子束（SAEB）对放电过程有重要的影响。在该压强下得出了SAEB瞬间产生相对放电电流的时延与压强的关系,根据该关系,时延随着压强增加而变化,并且在压强为2×10^5Pa时最小,同时扩散放电电流脉冲的峰值随压强增加而减小。在0.5×10^5Pa的压强下,使用刀片电极和6 cm长的N2∶SF6=10∶1的激活媒质,得到了输出能量为2 mJ、脉冲功率为0.55 MW的激光。最后,在大气压强下,对AlBe箔片进行了重复频率放电处理（REP）,其表层清除了碳而且氧原子以450 nm/300pulse渗入箔片。

关键词：体放电扩散放电非均匀电场逃逸电子紫外激光器修饰及清洁

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Evolution of ionization waves in a multi-pulsed plasma jet:the role of memory charges

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Plasma Science and Technology 2023年第3期25卷 95-103页

作者： N Yu BABAEVA G V NAIdIS V F TARASENKO d A sorokin Cheng ZHANG Tao SHAO Joint Institute for High Temperatures Russian Academy of Sciences Institute of High Current Electronics Siberian BranchRussian Academy of Sciences Institute of Electrical Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences

In this paper,we discuss the properties of ionization waves(IWs)in a multi-pulsed plasma jet while using the two-dimensional computational *** IWs are generated by application of three short negative pulses with a repetition frequency 12.5 *** simulations are performed continuously during a single run while accounting for charges accumulated inside(surface charges)and outside(space charges)the *** plasma forming gas mixture(He/O2=99.8%/0.2%)is injected through the discharge tube into the surrounding humid *** show that an IW can emerge from the tube exit at a pulse rising edge(as a negative IW)and at a falling edge of the same pulse(as a positive IW).It is demonstrated that remnants of the negative and positive charges play an essential role in the discharge *** first pulse travels the shortest distance as it propagates through the initially non-ionized *** IWs developing during the second pulse essentially enlarge the plasma plume *** the same time,the IWs generated by the third pulse eventually decay due to the remnants of charges accumulated during the previous *** memory charges can lead to the IW extinction.

关键词： helium plasma jet multiple pulses positive and negative ionization waves

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Patterning Nanoroads and Quantum dots on Fluorinated Graphene

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Nano Research 2011年第1期4卷 143-152页

作者： Morgana A. Ribas Abhishek K. Singh Pavel B. sorokin Boris I. Yakobson department of Mechanical Engineering and Materials Science and department of Chemistry Rice University Houston Texas 77005 USA Materials Research Centre Indian Institlzte of Science Bangalore 560012 India

Using ab initio methods we have investigated the fluorination of graphene and find that different stoichiometric phases can be formed without a nucleation barrier, with the complete ＂2d-Teflon＂ CF phase being thermody- namically most stable. The fluorinated graphene is an insulator and turns out to be a perfect matrix-host for patterning nanoroads and quantum dots of pristine graphene. The electronic and magnetic properties of the nanoroads can be tuned by varying the edge orientation and width. The energy gaps between the highest occupied and lowest unoccupied molecular orbitals （HOMO-LUMO） of quantum dots are size-dependent and show a confinement typical of dirac fermions. Furthermore, we study the effect of different basic coverage of F on graphene （with stoichiometries CF and C4F） on the band gaps, and show the suitability of these materials to host quantum dots of graphene with unique electronic properties.

关键词： Graphene fluorinated graphene fluorographene nanoroads quantum dots

Social structure and space use of Amur tigers(Panthera tigris altaica)in Southern Russian Far East based on GPS telemetry data

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Integrative Zoology 2015年第4期10卷 365-375页

作者： Jose A.HERNANdEZ-BLANCO Sergei V.NAIdENKO Maria d.CHISTOPOLOVA Victor S.LUKAREVSKIY Alexey KOSTYRYA Alexandr RYBIN Pavel A.sorokin Mikhail N.LITVINOV Andrey K.KOTLYAR dale G.MIQUELLE Viatcheslav V.ROZHNOV A.N.Severtsov Institute of Ecology and Evolution Russian Academy of ScienceMoscowRussia V.L.Komarov Ussuriskii State Nature Reserve Far Eastern BranchRussian Academy of ScienceUssuriskRussia Institute of Biology and Soil Sciences Far Eastern BranchRussian Academy of ScienceVladivostokRussia Wildlife Conservation Society VladivostokRussia

To better understand the spatial structure of Amur tigers(Panthera tigris altaica)at the southern edge of their range we fitted 14 tigers(6♀♀and 8♂♂)with 15 GPS-Argos collars between 2008 and 2011 in 2 study sites:the Ussuriskii Reserve of southern Sikhote-Alin and the Land of the Leopard National Park in southwest Primorye,Russian Far *** kernel estimates of male home ranges were larger than those of female home ranges(Pd kernel♀=401±205 km2;mean 95%fixed kernel♂=778±267 km2]).The home range size of females varied greatly,but on average was similar to estimates derived from earlier work further *** overlap of adjacent home ranges suggested that females retained exclusive *** core areas of females overlapped only slightly,and remained stable over multiple *** home ranges of adult males were smaller than those of males to the north,and in contrast to previous studies,high overlap among males indicated the absence of ***,real core areas of males did not overlap,suggesting some spatial *** comparison to other tiger populations and other areas of the Russian Far East,the sex ratio in our 2 study areas was highly skewed towards *** believe this skewed sex ratio resulted in the dissolution of territoriality of males due to an inability to defend individual females,with males resorting to scramble competition for *** monitoring of these sites to determine whether shifts in the sex ratio might result in a return to male territoriality would provide confirmation of our tentative hypothesis.

关键词： Amur tiger GPS-Argos telemetry home range overlap Panthera tigris altaica space use social structure sex ratio

Neutrons in a nanosecond low-pressure discharge in deuterium

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Matter and Radiation at Extremes 2016年第4期1卷 207-212页

作者： Victor F.Tarasenko Mikhail I.Lomaev dmitry A.sorokin Boris A.Nechaev Vladimir N.Padalko Gennady N.dudkin Laboratory of Optical Radiation of the Institute of High Current Electronics SB RAS Tomsk 634055Russia Physical Technical Institute National Research Tomsk Polytechnic UniversityTomsk 634050Russia National Research Tomsk State University Tomsk 634050Russia

Stable neutron generation with a yield of ~1.2×10^(4) neutrons per pulse was obtained during d(d,n)^(3)He reaction initiated by the high-voltage nanosecond discharge in a gap with a potential tungsten cylinder(anode)and a grounded deuterated zirconium plate(cathode)filled with deuterium at a pressure of ~10^(2) *** duration of the neutron pulse was ~1.5 *** intensive neutron emission was registered without deuterated *** of material of the tungsten electrode was observed during the high-voltage nanosecond discharge in the deuterium,hydrogen,helium and argon at pressures of 10^(2)-10^(4) Pa.

关键词： Neutrons deuterium High-voltage nanosecond discharge Low-pressure Thermonuclear reaction

High yield production of ultrathin fibroid semiconducting nanowire of Ta2Pd3Se8

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Nano Research 2020年第9期13卷 1627-1635页

作者： Xue Liu Sheng Liu Liubov Yu.Antipina Yibo Zhu Jinliang Ning Jinyu Liu Chunlei Yue Abin Joshy Yu Zhu Jianwei Sun Ana M.Sanchez Pavel B.sorokin Zhiqiang Mao Qihua Xiong Jiang Wei department of Physics and Engineering Physics Tulane UniversityNew OrleansLouisiana70118USA division of Physics and Applied Physics Nanyang Technological UniversitySingapore637371Singapore National University of Science and Technology“MISiS” Moscow119049Russia department of Polymer Science The University of AkronAkronOhio44325USA Technological Institute for Superhard and Novel Carbon Materials Moscow108840Russia Moscow Institute of Physics and Technology Dolgoprudny141700Russia department of Mechanical Engineering Columbia UniversityNew YorkNew York10027USA department of Physics University of WarwickCoventryCV47ALUK

Immediately after the demonstration of the high-quality electronic properties in various two dimensional(2d)van der Waals(vdW)crystals fabricated with mechanical exfoliation,many methods have been reported to explore and control large scale *** with recent advancements in fabricating 2d atomic layered crystals,large scale production of one dimensional(1d)nanowires with thickness approaching molecular or atomic level still remains ***,we demonstrate the high yield production of a 1d vdW material,semiconducting Ta2Pd3Se8 nanowires,by means of liquid-phase *** thinnest nanowire we have readily achieved is around 1 nm,corresponding to a bundle of one or two molecular *** electron microscopy(TEM)and transport measurements reveal the as-fabricated Ta2Pd3Se8 nanowires exhibit unexpected high crystallinity and chemical *** low-frequency Raman spectroscopy reveals clear evidence of the existing of weak inter-ribbon *** fabricated nanowire transistors exhibit high switching performance and promising applications for photodetectors.

关键词： van der Waals nanowire 1d semiconductor liquid exfoliation micro Raman spectroscopy electronic and optoelectronic device

A Review on Electrodynamic Influence of Atmospheric Processes to the Ionosphere

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Open Journal of Earthquake Research 2020年第2期9卷 113-141页

作者： Valery M. sorokin Vitaly M. Chmyrev Masashi Hayakawa Institute of Terrestrial Magnetism Ionosphere and Radio Wave Propagation (IZMIRAN) Russian Academy of Sciences Troitsk Moscow Russia Institute of Physics of the Earth Russian Academy of Sciences Moscow Russia Hayakawa Institute of Seismo Electromagnetics (Hi-SEM) Co. Ltd. University of Electro-Communications (UEC) Chofu Japan

This work is an attempt to critically analyze the existing theoretical models of the impact of earthquake preparation processes on the state of the earth’s atmosphere and ionosphere in the zone of growing seismic activity, as well as the mechanisms of formation and transfer of disturbances in various media over the earthquake center. The determining factor (criterion) of the analysis is the degree of compliance of the simulation results with experimental data obtained at various phases of earthquake development by direct and remote diagnostic methods using ground and aerospace technologies. The key role is played by the model’s compliance with the results of measuring electric fields and currents in the near-ground atmosphere and ionosphere, small-scale ionospheric inhomogeneities and correlated field-aligned currents and electromagnetic ULF/ELF emissions. A full-fledged model should also explain the origin of such seismic related phenomena as the generation in the troposphere and over-horizon propagation of pulsed VHF radiation, thermal effects and associated IR emissions as well as the modification of plasma distribution in the d, E and F layers of the ionosphere. The use of this criterion in the analysis allowed us to identify a theoretical model that most fully describes the totality of the above-mentioned experimental data within a single physical mechanism. This is an electrodynamic model based on the perturbation of the conductivity current in the global atmosphere—ionosphere electric circuit due to the injection of charged aerosols into the atmosphere during the preparation and development of an earthquake. The present paper describes this model and the formation mechanisms of related phenomena in the atmosphere and ionosphere, which can be considered as short-term precursors to earthquakes.

关键词： Earthquake (EQ) Precursors Charged Aerosol Injection Global Electric Circuit Ionospheric Irregularities ULF/ELF Electromagnetic Emissions Ran-dom discharges Radiation Over-the-Horizon VHF Propagation

漠河前陆盆地砂岩岩石地球化学的构造背景和物源区分析

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中国科学（d辑） 2003年第12期33卷 1219-1226页

作者：和政军李锦轶莫申国 A.A.sorokin 中国地质科学院地质研究所北京100037 俄罗斯科学院远东分院

砂岩岩石地球化学对沉积盆地形成时期构造背景的稳定与否有着较高的敏感性,已成为地质构造复杂地区研究的有效手段.分析表明,中生代漠河盆地砂岩在化学成分特征上显示出活动大陆边缘盆地的特点;同时又充分地揭示出,碎屑物质主要来自北... 详细信息

砂岩岩石地球化学对沉积盆地形成时期构造背景的稳定与否有着较高的敏感性,已成为地质构造复杂地区研究的有效手段.分析表明,中生代漠河盆地砂岩在化学成分特征上显示出活动大陆边缘盆地的特点;同时又充分地揭示出,碎屑物质主要来自北侧的造山带并接受了盆地南侧的大陆区碎屑来源,具有前陆盆地的二元物源特征根据岩石地球化学分析并结合构造等方面的研究结果,认为中国黑龙江省漠河盆地的堆积物应属于磨拉石沉积,所反映出的盆地构造类型应为前陆盆地,而不是以往认为的裂谷盆地.这一研究结果为漠河前陆盆地与相邻蒙古-鄂霍茨克造山带在中生代的构造成因关系提供了重要的岩石地球化学依据.

关键词：漠河前陆盆地砂岩岩石地球化学构造背景碎屑物源区侏罗纪

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