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Gyrokinetic simulation of magnetic-island-induced electric potential vortex mode

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Plasma Science and Technology 2024年第1期26卷 34-41页

作者：王丰李继全曲洪鹏彭晓东 Southwestern Institute of Physics Chengdu 610041People’s Republic of China

Ion temperature gradient(ITG)-driven turbulence with embedded static magnetic islands is simulated by utilizing a gyrokinetic theory-based global turbulence transport code(GKNET)in this *** from the traditional equilibrium circular magnetic-surface average(EMSA)method,an advanced algorithm that calculates the perturbed magnetic-surface average(PMSA)of the electric potential has been developed to precisely deal with the zonal flow component in a non-circular magnetic surface perturbed by magnetic *** show that the electric potential vortex structure inside islands induced by the magnetic islands is usually of odd parity when using the EMSA *** is found that the odd symmetry vortex can transfer into an even one after a steep zonal flow gradient,*** flow shear has been built in the vicinity of the magnetic islands by adopting the PMSA *** phase of the potential vortex in the poloidal cross section is coupled with the zonal flow *** an electric potential vortex mode may be of essential importance in wide topics,such as the turbulence spreading across magnetic islands,neoclassical tearing mode physics,and also the interaction dynamics between the micro-turbulence and MHD activities.

关键词： magnetic islands electric vortex ITG perturbed magnetic flux surface average

“双减”政策下体育教育公平审思:意义解读、问题防范与发展路向

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成都体育学院学报 2024年第2期50卷 120-126页

作者：覃立黎吉权成都体育学院历史文化学院四川成都610041 贵州师范大学体育学院贵州贵阳550025

“双减”作为一项关乎国家未来的重要教育政策,一方面,其发布本身就具有教育平权的深远意义;另一方面,它为义务教育阶段的体育教育带来发展机遇的同时,也暗藏了教育公平问题的隐忧。文章对“双减”政策下体育教育公平问题进行了意义解... 详细信息

“双减”作为一项关乎国家未来的重要教育政策,一方面,其发布本身就具有教育平权的深远意义;另一方面,它为义务教育阶段的体育教育带来发展机遇的同时,也暗藏了教育公平问题的隐忧。文章对“双减”政策下体育教育公平问题进行了意义解读、问题防范与发展路向三方面的思考。研究认为,首先,应充分认识到“双减”政策的教育公平意义。该政策的出台是党和国家对我国义务教育发展公平态势的及时研判,以及对西方社会教育阶层化非公平困境的精准洞察,其目的是响应人民群众呼声,回归教育初心,推动教育改革发展成果更多、更公平惠及全体人民。其次,“双减”政策下的体育教育公平需要防范以下几个方面:一是“双减”政策执行过程中可能造成体育教育公平偏差;二是“双减”政策可能对体育中高考的公平性产生重要影响;三是应防范“双减”政策下新旧不公平现象和因素的叠加。最后,研究探讨了“双减”政策下体育教育公平的发展路向:一是加强学校体育主阵地建设;二是兼顾体育教育的公平与质量;三是朝着个体均衡的方向发展。

关键词：双减政策体育教育教育公平学校体育

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非对称钢-混混合梁桥关键技术研究

世界桥梁 2024年第2期52卷 21-28页

作者：李积泉郑舜航路云强佛山交通投资集团有限公司广东佛山528000 湖南大学土木工程学院湖南长沙410082 中铁大桥局集团有限公司湖北武汉430050

为给多跨非对称钢-混混合梁桥设计与施工提供参考,以一座4跨非对称钢-混混合梁桥——龙翔大桥主航道桥为背景,采用有限元软件建立该桥杆系结构有限元模型,分析不同合龙顺序、钢箱梁长度对该桥成桥后线形和内力的影响,以及9个关键参数对... 详细信息

为给多跨非对称钢-混混合梁桥设计与施工提供参考,以一座4跨非对称钢-混混合梁桥——龙翔大桥主航道桥为背景,采用有限元软件建立该桥杆系结构有限元模型,分析不同合龙顺序、钢箱梁长度对该桥成桥后线形和内力的影响,以及9个关键参数对预拱度及合龙口纵向变形的影响。结果表明:合龙顺序对成桥线形和内力的影响较小,该桥采用2个中跨依次合龙的施工顺序;各墩墩顶负弯矩绝对值和中跨跨中挠度随钢箱梁长度与中跨跨径之比k 1增大而呈线性减小,该桥k 1最终取0.371,中跨钢箱梁长75 m;钢箱梁自重和主梁混凝土弹性模量对预拱度影响较大,前者变化6%、后者变化10%时预拱度变化值分别约为15 mm和13 mm;环境温度对合龙口纵向变形影响较大,环境温度变化10℃时合龙口纵向变形变化12 mm。施工控制时应严格控制钢箱梁自重、主梁混凝土弹性模量,确保按设计温度合龙。

关键词：钢-混混合梁桥非对称体系合龙顺序钢箱梁长度预拱度合龙口纵向变形参数分析有限元法

Progress of Lyman-alpha-based beam emission spectroscopy(Ly BES)diagnostic on the HL-2A tokamak

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Plasma Science and Technology 2024年第3期26卷 118-125页

作者：周艺轩余羿许敏柯锐聂林徐皓赵光义刘灏袁子豪肖晨雨李继全肖池阶 the HL-2A Team Southwestern Institute of Physics Chengdu 610041People's Republic of China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082People's Republic of China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871People's Republic of China

An edge Lyman-alpha-based beam emission spectroscopy(LyBES)diagnostic,using a heating NBI(neutral beam injection)system,is currently under development on the HL-2A *** 20-channel edge LyBES,which is intended to measure the density fluctuation in plasma edge(from R=1960 mm to R=2026 mm)with an improved spatial resolution of 3.3 mm,is a complement to the existing conventional beam emission spectroscopy(BES)*** this article,we introduce the progress of LyBES diagnostic,including the collection optics,the monochromator,and the detector *** reflectance of the collection mirrors is measured to be~82%at 122 nm,and the aberration geometrical radius of the collection optics is tested to be~150μm in the aimed *** linear dispersion of the LyBES monochromator is designed to be~0.09 nm mm^(-1).The bandwidth of the detector system with the 5×10^(7)V A^(-1)preamplifier gain is measured to be~280 kHz,and the peak-to-peak noise of the detector system is tested to be~16 *** finalized design,components development and testing of the LyBES diagnostic have been completed at present,and an overall performance of the LyBES diagnostic is to be confirmed in the next HL-2A campaign.

关键词： density fluctuation Ly BES BES vacuum ultraviolet

Design of low power 4×40 Gb/s laser diode driver for parallel optical transmission systems

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Science China(Information Sciences) 2017年第8期60卷 246-248页

作者： Yingmei CHEN Zhen ZHANG jiquan li Hui WANG Pengxia WANG Yanwei li Institute of Radio Frequency & Opto-Electronic Integrated Circuits Southeast University School of Integrated Circuits Southeast University

Compared with conventional electrical interconnection technology,optical interconnection has the merits of anti-interference,small signal loss,long transmission distance and so ***,parallel optical interconnects become the crucial technique to solve the problem of large capacity data transmission in high-speed transmission *** parallel mode can decrease transmit rate of every optical fiber,reduce the demands for optical devices and decrease the cost of optical interconnects[1–3].

关键词： of is on VCSEL Design of low power 4 Gb/s laser diode driver for parallel optical transmission systems for

Gyrofluid Simulation of Ion-Scale Turbulence in Tokamak Plasmas

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Communications in Computational Physics 2008年第10期4卷 1245-1257页

作者： jiquan li Y.Kishimoto Graduate School of Energy Science Kyoto UniversityUjiKyoto 611-0011Japan Institute for Fusion Theory and Simulation ZhejiangUniversityHangzhouChina

An improved three-field gyrofluid model is proposed to numerically simulate ion-scale turbulence in tokamak plasmas,which includes the nonlinear evolution of perturbed electrostatic potential,parallel ion velocity and ion pressure with adiabatic electron *** is benchmarked through advancing a gyrofluid toroidal global(GFT G)code as well as the local version(GFT L),with the emphasis of the collisionless damping of zonal *** nonlinear equations are solved by using Fourier decomposition in poloidal and toroidal directions and semi-implicit finite difference method along radial *** numerical implementation is briefly explained,especially on the periodic boundary condition in GFT L *** a numerical test and also practical application,the nonlinear excitation of geodesic acoustic mode(GAM),as well as its radial structure,is investigated in tokamak plasma turbulence.

关键词： Geodesic acoustic mode(GAM) zonal flow ion temperature gradient(ITG)turbulence gyrofluid simulation tokamak

Effect of electronic stimulation at Neiguan(PC 6) acupoint on gene expression of adenosine triphosphate-sensitive potassium channel and protein kinases in rats with myocardial ischemia

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Journal of Traditional Chinese Medicine 2015年第5期35卷 577-582页

作者： Wang Wei li jiquan Meng Xiangyu Chen Yiguo College of Acupuncture and Massage Liaoning University of Traditional Chinese Medicine

OBJECTIVE:To investigate the effects of electronic stimulation at acupoints Neiguan(PC 6) and lieque(LU 7) on the gene expression of the adenosine triphosphate(ATP)-Sensitive potassium channel(KATP:Kir6.1,Kir6.2,SUR2 A,and SUR2B) and protein kinases(PKA,PKG,and PKCβ2) in myocardial cells of rats with myocardial ischemia(Ml) induced by isoproterenol(ISO).METHODS:Rats were randomly divided into a control,model,Neiguan(PC 6),lieque(LU 7),and non-acupoint *** Ml model was established by injecting rats with ***-acupuncture treatment was given to the acupuncture groups,once a day for 7 *** expression was analyzed with real-time ***:The gene expression of KATP and protein kinases in the model group was higher than those in the control group(P lieque(LU 7) groups compared with the model group[P lieque(LU 7) group(P 0.05).CONCLUSION:Our findings suggest that electronic needling of Neiguan(PC 6) can both reduce the gene expression of KATP and protein kinases in rats with ISO-induced Ml.

关键词： Point PC6(Neiguan) Acupuncture Electric stimulation KATP Channels Protein Kinases Myocardial ischemia

Machine learning of turbulent transport in fusion plasmas with neural network

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Plasma Science and Technology 2021年第11期23卷 9-17页

作者： Hui li Yanlin FU jiquan li Zhengxiong WANG Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Physics.Dalian University of TechnologyDalian 116024People's Republic of China Southwestern Institute of Physics Chengdu 610041People's Republic of China School of Physics Dalian University of TechnologyDalian 116024People's Republic of China

Turbulent transport resulting from drift waves,typically,the ion temperature gradient(ITG)mode and trapped electron mode(TEM),is of great significance in magnetic confinement *** is also well known that turbulence simulation is a challenging issue in both the complex physical model and huge CPU cost as well as long computation *** this work,a credible turbulence transport prediction model,extended fluid code(ExFC-NN),based on a neural network(NN)approach is established using simulation data by performing an ExFC,in which multi-scale multi-mode fluctuations,such as ITG and TEM turbulence are *** show that the characteristics of turbulent transport can be successfully predicted including the type of dominant turbulence and the radial averaged fluxes under any set of local gradient ***,a global NN model can well reproduce the radial profiles of turbulence perturbation intensities and fluxes much faster than existing codes.A large number of comparative predictions show that the newly constructed NN model can realize rapid experimental analysis and provide reference data for experimental parameter design in the future.

关键词： neural network plasma turbulence transport properties plasma simulation

青海省大骨节病病区成人血清α2-巨球蛋白检测结果分析

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中华地方病学杂志 2024年第1期43卷 66-67页

作者：李强周昕王建玲李积权赵延梅薛红梅赵志军王丽华青海省地方病预防控制所地方病预防控制科，西宁810021 青海省地方病预防控制所布病预防控制科，西宁810021 哈尔滨医科大学中国疾病预防控制中心地方病控制中心，哈尔滨150081

大骨节病(KBD)是一种慢性、地方性、变形性骨关节病,其病因尚不明确。青海省成人KBD患者分布相对集中,开展相关KBD防治研究工作,将为KBD的精准医疗提供科学依据[1]。α2-巨球蛋白(α2-M)是一种广谱蛋白酶抑制剂,对多种蛋白水解酶都有抑... 详细信息

大骨节病(KBD)是一种慢性、地方性、变形性骨关节病,其病因尚不明确。青海省成人KBD患者分布相对集中,开展相关KBD防治研究工作,将为KBD的精准医疗提供科学依据[1]。α2-巨球蛋白(α2-M)是一种广谱蛋白酶抑制剂,对多种蛋白水解酶都有抑制作用,补充α2-M可减轻软骨损伤,抑制分解代谢因子基质金属蛋白酶-13(MMP-13)的表达,同时增强软骨基质Ⅱ型胶原和蛋白聚糖的合成,可能对骨关节炎(OA)的发生发展产生影响[2]。因此,本研究对青海省KBD病区成人进行血清α2-M检测,探讨其对KBD发生发展的影响,现将结果报道如下。

关键词：大骨节病成人血清 α2-巨球蛋白