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Dy.amic stabilization of plasma instability

High Power Laser Science and Engineering 2019年第1期7卷 17-26页

作者： S.Kawata T.Karino y.J.Gu Graduate School of Engineering Utsunomiya University Institute of Phy.ics of the ASCR ELI-Beamlines Institute of Plasma Phy.ics of the CAS

The paper presents a review of dy.amic stabilization mechanisms for plasma instabilities. One of the dy.amic stabilization mechanisms for plasma instability.was proposed in the paper [Kawata, Phy.. Plasmas 19, 024503(2012)],based on a perturbation phase control. In general, instabilities emerge from the perturbations. Normally.the perturbation phase is unknown, and so the instability.growth rate is discussed. However, if the perturbation phase is known, the instability.growth can be controlled by.a superimposition of perturbations imposed actively. Based on this mechanism we present the application results of the dy.amic stabilization mechanism to the Ray.eigh–Tay.or instability.RTI) and to the filamentation instability.as ty.ical examples in this paper. On the other hand, in the paper [Boris, Comments Plasma Phy.. Control. Fusion 3, 1(1977)] another mechanism was proposed to stabilize RTI, and was realized by.the pulse train or the laser intensity.modulation in laser inertial fusion [Betti et al., Phy.. Rev. Lett. 71, 3131(1993)]. In this latter mechanism, an oscillating strong force is applied to modify.the basic equation, and consequently.the new stabilization window is created. Originally.the latter was proposed by.Kapitza. We review the two stabilization mechanisms, and present the application results of the former dy.amic stabilization mechanism.

关键词： dy.amic instability stabilization filamentation instability plasma instability Ray.eigh-Tay.or instability stabilization of instability

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A Bilinear Immersed Finite Volume Element Method for the Diffusion Equation with Discontinuous Coefficient

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Communications in Computational Phy.ics 2009年第6期6卷 185-202页

作者： X.-M.He T.Lin y.Lin Department of Mathematics Virginia TechBlacksburgVA 24060USA Department of Mathematical and Statistical Science University of AlbertaEdmonton ABT6G 2G1Canada Department of Applied Mathematics The Hong Kong Polytechnic UniversityKowloonHong Kong

This paper is to present a finite volume element(FVE)method based on the bilinear immersed finite element(ife)for solving the boundary.value problems of the diffusion equation with a discontinuous coefficient(interface problem).This method possesses the usual FVE method’s local conservation property.and can use a structured mesh or even the Cartesian mesh to solve a boundary.value problem whose coefficient has discontinuity.along piecewise smooth nontrivial *** examples are provided to demonstrate features of this *** particular,this method can produce a numerical solution to an interface problem with the usual O(h2)(in L2 norm)and O(h)(in H1 norm)convergence rates.

关键词： Interface problems immersed interface finite volume element discontinuous coeffi-cient diffusion equation

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Zircon micro-texture and chemistry.an investigation of magmatic history.and cry.tallization temperature of quartz potassic sy.nite from Iwo area,Southwestern Nigeria

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Acta Geochimica 2022年第1期41卷 39-49页

作者： Ademuy.wa Adetunji Valentin y.anev Department of Geology Obafemi Awolowo UniversityIle-IfeNigeria Geological Institute Bulgarian Academy of Sciences1113 SofiaBulgaria

The Neoproterozoic quartz potassic sy.nite of the Iwo area,Southwestern Nigeria has been investigated for its magmatic history.and zircon saturation *** zircon morphology.showed irregular shapes with sectoral and oscillatory.micro *** majority.of the zircon grains have embay.ent,which corresponds to magmatic *** sy.nite cry.tallized from probably.multiple recharge of less evolved *** the magma injection and subsequent cry.tallization of the rock occurred over a length of time giving the rock some degree of protracted thermal history.and slight fluctuation in chemistry.which are manifested as zonation in the analy.ed zircon *** initial stage of zircon cry.tallization was marked by.a lower cerium anomaly.than the final stage,which indicates changes from lower oxidizing to higher oxidizing *** protracted history.does not affect the europium anomalies at any.stage of *** average zircon saturation temperature of 865℃estimated from titanium in zircon(T_(Tiz)℃)thermometer using titanium activity.of 0.7(^(a)TiO_(2)~0.7)is taken as reasonable cry.tallization temperature of the *** is fairly.consistent with 877℃deduced from the zircon solubility.*** titanium in zircon temperature of 910℃at aTiO_(2)~1 is rather too high to be a useful *** the temperatures 865 and 877℃are however consistent with those of intermediate *** size of the sy.nite and protracted cry.tallization history.would have made the temperature to have impacted the metamorphic envelope around the sy.nite.

关键词： Iwo LA-ICP-MS Magmatic history Nigeria Quartz potassic sy.nite Zircon

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走向符号实践:论幼儿园教育环境的意义创设逻辑

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浙江师范大学学报（社会科学版） 2017年第6期42卷 31-37页

作者：黄豪杨晓萍西南大学教育学部重庆400715

现实中幼儿园教育环境创设的异态现象突出,是一种符号僭越主体的实践活动:儿童被客体化和工具化对待;幼儿园教育环境演变为一种意义缺失的符号;创设实践漠视儿童本体观,与儿童人为分离。但环境创设不是摆设,把幼儿园教育环境的创设当作... 详细信息

现实中幼儿园教育环境创设的异态现象突出,是一种符号僭越主体的实践活动:儿童被客体化和工具化对待;幼儿园教育环境演变为一种意义缺失的符号;创设实践漠视儿童本体观,与儿童人为分离。但环境创设不是摆设,把幼儿园教育环境的创设当作是一种符号化活动,就是要与儿童生活世界意义联结。基于人生命的三维现象视角,幼儿园教育环境是要以一种直面儿童是自然的存在、精神的存在和社会的存在的儿童本体观,以此实现走向符号实践的幼儿园教育环境创设的应有之义和实践逻辑向度,即保留儿童自然性、尊重儿童精神需要、直面儿童社会化。

关键词：儿童三维生命幼儿园教育环境符号实践

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Multibeam laser-plasma interaction at the Gekko XII laser facility.in conditions relevant for direct-drive inertial confinement fusion

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High Power Laser Science and Engineering 2023年第2期11卷 70-80页

作者： G.Cristoforetti P.Koester S.Atzeni D.Batani S.Fujioka y.Hironaka S.Hüller T.Idesaka K.Katagiri K.Kawasaki R.Kodama D.Mancelli Ph.Nicolai N.Ozaki A.Schiavi K.Shigemori R.Takizawa T.Tamagawa D.Tanaka A.Tentori y.Umeda A.y.go L.A.Gizzi Intense Laser Irradiation Laboratory INO-CNRPisaItaly Dipartimento SBAI Universitàdi Roma‘La Sapienza’RomaItaly UniversitéBordeaux CNRSCEACELIATalenceFrance Institute of Laser Engineering Osaka UniversityOsakaJapan Centre de Phy.ique Théorique CPHT CNRSIP ParisEcole PolytechniquePalaiseauFrance Graduate School of Engineering Osaka UniversityOsakaJapan Institute of Plasma Phy.ics and Lasers Hellenic Mediterranean University Research CentreRethymnonGreece Institute for Integrated Radiation and Nuclear Science Kyoto UniversitySennanOsakaJapan

Laser–plasma interaction and hot electrons have been characterized in detail in laser irradiation conditions relevant for direct-drive inertial confinement *** experiment was carried out at the Gekko XII laser facility.in multibeam planar target geometry.at an intensity.of approximately.3×10^(15)W/cm^(2).Experimental data suggest that high-energy.electrons,with temperatures of 20–50 keV and conversion efficiencies ofηy.produced by.the damping of electron plasma waves driven by.two-plasmon decay.TPD).Stimulated Raman scattering(SRS)is observed in a near-threshold growth regime,producing a reflectivity.of approximately.0.01%,and is well described by.an analy.ical model accounting for the convective growth in independent *** experiment reveals that both TPD and SRS are collectively.driven by.multiple beams,resulting in a more vigorous growth than that driven by.single-beam laser intensity.

关键词： inertial confinement fusion laser plasma interaction parametric instabilities

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Studies of laser-plasma interaction phy.ics with low-density.targets for direct-drive inertial confinement schemes

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Matter and Radiation at Extremes 2019年第4期4卷 15-22页

作者： V.Tikhonchuk y.J.Gu O.Klimo J.Limpouch S.Weber ELI-Beamlines Institute of PhysicsAcademy of Sciences of the Czech Republic18221 PragueCzech Republic Centre Lasers Intenses et Applications University of Bordeaux–CNRS–CEATalence 33405France Institute of Plasma Phy.ics of the CAS Za Slovankou 1782/318200 PragueCzech Republic FNSPE Czech Technical University in Prague11519 PragueCzech Republic

Comprehensive understanding and possible control of parametric instabilities in the context of inertial confinement fusion (ICF) remains achallenging task. The details of the absorption processes and the detrimental effects of hot electrons on the implosion process require as mucheffort on the experimental side as on the theoretical and simulation side. This paper describes a proposal for experimental studies on nonlinearinteraction of intense laser pulses with a high-temperature plasma under conditions corresponding to direct-drive ICF schemes. We propose todevelop a platform for laser-plasma interaction studies based on foam targets. Parametric instabilities are sensitive to the bulk plasma temperatureand the density.scale length. Foam targets are sufficiently.flexible to allow control of these parameters. However, investigationsconducted on small laser facilities cannot be extrapolated in a reliable way.to real fusion conditions. It is therefore necessary.to performexperiments at a multi-kilojoule energy.level on medium-scale facilities such asOMEGAor SG-III. An example of two-plasmon decay.instability.xcited in the interaction of two laser beams is considered.

关键词： interaction details excited

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Gold Nanorods as a Resonance Light Scattering Probe for Environmental Analy.is with Copper(Ⅱ) as a Model Analy.e

Gold Nanorods as a Resonance Light Scattering Probe for Envi...

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第三十五届国际光谱会议

作者： J.Wang~(1,2) y.F.Li~2 C.Z.Huang~(*,1) K.J.Tan~2 1 College of Pharmaceutical Sciences 2 College of Chemistry.and Chemical Engineering,CQKL-LRTA,Southwest University.Chongqing 400715,China

A lighting scattering (LS) ratiometric method is developed with gold nanorods (NRs), prepared by.seed-mediated method [1].In HAc-NaAc buffer,the LS signals at 271.0 nm of CTAB decreased due to the inner filter effect (ife) caused by.the Cu-EDTA complex,and gold NRs display.d weak enhanced LS signals at 344.0nm because of the

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