Effects of toroidal rotation and ion collisional viscosity on low-frequency zonal flow in tokamak plasma
作者：
Chen, You;Yu, Jun;Xie, Bao-yi* ;Yin, Lan;Xiang, Dong;...
期刊：
Journal of the Korean Physical Society ,2024年84(8):604-609 ISSN：0374-4884
通讯作者：
Xie, Bao-yi;Gong, XY
作者机构：
[Yin, Lan; Gong, Xue-yu; Chen, You; Xie, Bao-yi; Xiang, Dong; Xie, BY] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Yu, Jun] Zhejiang Guangsha Vocat & Tech Univ Construct, Sch Intelligent Mfg, Dongyang 322100, Peoples R China.;[Yin, Lan; Chen, You] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Yin, Lan; Chen, You] Univ South China, Hunan Key Lab Math Modeling & Sci Comp, Hengyang 421001, Peoples R China.
通讯机构：
[Gong, XY ; Xie, BY] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
Aerodynamics;Damping;Isotherms;Mach number;Magnetoplasma;Rotation;Tokamak devices;Viscosity;Collisional viscosity;Damping rate;Fluid modeling;Isothermal process;Low-frequency zonal flow;Lower frequencies;Theoretical investigations;Tokamak plasmas;Toroidal rotation;Zonal flows;Ions
摘要：
Theoretical investigations are conducted to examine the impact of toroidal rotation and ion collisional viscosity on low-frequency zonal flow (LFZF) in a tokamak plasma with the fluid model. The results indicate that while the frequency of LFZF remains unchanged during an isothermal process with γ=1, its damping rate is influenced by both toroidal rotation and ion collisional viscosity. Specifically, as the ion collisional viscosity increases, so does the damping rate of LFZF; conversely, as the toroidal rotation As its Mach number rises, its damping rate decreases. For a non-isothermal process with γ>1 (such as γ=5/3), the damping rate and frequency of LFZF are influenced by both toroidal rotation and ion collisional viscosity. It has been demonstrated that when the toroidal rotation Mach number surpasses a certain threshold, the frequency transitions from zero to a finite value, while the damping rate decreases as the toroidal rotation Mach number increases for LFZF. Furthermore, it has been observed that the damping rate of LFZF increases while the frequency decreases with an increase in ion collisional viscosity. Moreover, when the ion collisional viscosity surpasses a certain threshold, the frequency of LFZF drops to zero. © The Korean Physical Society 2024.
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Numerical study of minority ion heating scenarios in a spherical tokamak plasma
作者：
Chen, You;Yin, Lan* ;Peng, Yaoyi;Ma, Wankun;Zhou, Fangbei;...
期刊：
PHYSICS OF PLASMAS ,2024年31(3) ISSN：1070-664X
通讯作者：
Yin, L;Yin, Lan;Gong, XY
作者机构：
[Yin, Lan; Chen, You; Yin, L] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.;[Yin, Lan; Yin, L; Gong, Xueyu; Chen, You; Peng, Yaoyi; Ma, Wankun; Zhou, Fangbei; Wang, Shuangshuang] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Yin, Lan; Chen, You; Yin, L] Univ South China, Hunan Key Lab Math Modeling & Sci Comp, Hengyang 421001, Peoples R China.
通讯机构：
[Yin, L; Gong, XY ; Yin, L ] U;Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Univ South China, Hunan Key Lab Math Modeling & Sci Comp, Hengyang 421001, Peoples R China.
摘要：
<jats:p>In this study, D(H) minority ion cyclotron resonance heating (ICRH) scenarios in Nan Chang spherical tokamak (NCST) were simulated using the full-wave code TORIC. NCST is a low-aspect-ratio (R/a = 1.67) spherical tokamak, with its core plasma parameters characterized by a magnetic field intensity of 0.36 T and a density of 1018 m−3. Our simulation results demonstrate that the ion cyclotron wave can penetrate the core plasma of the NCST more effectively with a lower toroidal mode number, indicating that resonant ions can absorb the wave energy efficiently. Furthermore, it is found that as the minority ion H concentration is increased, a noticeable decline in the left-handed electric field adjacent to the ion cyclotron resonance layer is observed. Optimal heating efficiency is attained when maintaining a minority ion H concentration within the range 5%–10%. The minority ion velocity distribution was simulated to estimate the tail temperature of minority-ICRH, which is expected to exceed 10 keV. The difference in the power efficiency with different plasma compositions [Ar(H) and D(H)] was also simulated. When the H-ion cyclotron resonance layer is located at the core plasma, the power-absorption fraction of H in Ar(H) plasma surpasses that of D and H combined in D(H) plasma under identical conditions. These simulations provide a crucial foundation and theoretical reference not only for NCST but also for other spherical tokamaks conducting ICRH experiments.</jats:p>
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A full wave solver integrated with a Fokker-Planck code for optimizing ion heating with ICRF waves for the ITER deuterium-tritium plasma
作者：
Yin, Lan;Peng, Yaoyi;Zhang, Jiahui;Zhang, Xinjun;Zheng, Pingwei;...
期刊：
Nuclear Fusion ,2024年64(7):076020 ISSN：0029-5515
通讯作者：
Zhang, JH;Zhang, XJ
作者机构：
[Yin, Lan; Chen, You] Univ South China, Sch Math & Phys, Hunan Key Lab Math Modeling & Sci Comp, Hengyang 421001, Peoples R China.;[Tan, Qingyi; Peng, Yaoyi] Univ South China, Sch Elect Engn, Hengyang 421001, Peoples R China.;[Ma, Wankun; Gong, Xueyu; Wang, Shuangshuang] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Zheng, Pingwei] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Zhang, Jiahui] Xidian Univ, Sch Aerosp Sci & Technol, Xian 710071, Shaanxi, Peoples R China.
通讯机构：
[Zhang, XJ ] C;[Zhang, JH ] X;Xidian Univ, Sch Aerosp Sci & Technol, Xian 710071, Shaanxi, Peoples R China.;Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China.
关键词：
Codes (symbols);Collisional plasmas;Cyclotrons;Deuterium;Energy transfer;Experimental reactors;Magnetoplasma;Tokamak devices;Tritium;Deuterium-tritium plasmas;Fokker Planck;Full wave solv;Full waves;Fusion devices;ICRF wave;Ion cyclotron range of frequency;Ion cyclotron resonance heating;Ion Heating;ITER;Ions
摘要：
Efficient ion heating is crucial for future fusion devices, and the only way to heat ions directly is ion cyclotron resonance heating. Reported here is a full wave solver integrated with a Fokker-Planck code for optimizing ion heating with ion cyclotron range of frequency waves for the International Thermonuclear Experimental Reactor deuterium-tritium plasma. Both the direct absorption of minority ions and the power transfer to bulk ions via collisions are considered, while also accounting for the edge effects on ion absorption near the core. The simulation results show that the appropriate scrape-off layer density profile and parallel wave number lead to enhanced edge coupling and broaden the absorption region with moderate absorption intensity of the minority ions, which is very important for ion heating. More power from the heated ions is transferred to bulk ions than to electrons through collisions in our simulation via optimization, and reducing the total RF power results in a significant increase of the absorbed fraction of bulk ions. © 2024 The Author(s). Published by IOP Publishing Ltd on behalf of the IAEA. All rights reserved.
语种：
英文
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Classification and prediction of radon stable zone in uranium tailings pond: a case study from uranium tailings pond in sothern China
作者：
Yifan Chen;Xianwei Wu;Tiejun Zhang;Min Zhang;Xingwang Dai;...
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2023年332(2):251-259 ISSN：0236-5731
通讯作者：
Zhenghua Xu<&wdkj&>Yong Liu
作者机构：
[Chen Y.; Wu X.; Dai X.] School of Resources Environmental and Safety Engineering, University of South China, Hunan, Hengyang, 421001, China;[Zhang T.] China Nuclear Industry 23 Construction Co., LTD., Beijing, 101300, China;[Zhang M.] China Nuclear Huachen Construction Engineering Co., LTD., Shaanxi, Xi’an, 710000, China;[Xu Z.] School of Mathematics and Physics, University of South China, Hunan, Hengyang, 421001, China;[Liu Y.] College of Physics and Optoelectronic Engineering, Shenzhen University, Guangdong, Shenzhen, 518060, China
通讯机构：
[Zhenghua Xu] S;[Yong Liu] C;School of Mathematics and Physics, University of South China, Hengyang, China<&wdkj&>College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, China
关键词：
radon;uranium;Article;artificial neural network;atmospheric radioactivity;China;concentration (parameter);dam (barrier);extreme value theory;mathematical analysis;mine tailings;pond;porosity;prediction;radiation safety;radioisotope decay
摘要：
Radon is a radioactive gas produced by the decay of radium in uranium tailings, which can migrate to the atmosphere through tiny pores in the soil and can be used to characterize the internal stability of tailings dam. A method for determining the stable zone of radon is proposed, in which the radon concentration of uranium tailings pond is divided into stable zone, asymptotically stable zone, and unstable zone, and through the WOA-BP neural network algorithm for intelligent early warning of stability zone. The results show that the MAPE (Mean Absolute Percentage Error) is reduced by 20.16% by dividing the stable region, And MAPE of WOA-BP neural network algorithm is 8.22% lower than that of BP neural network algorithm. It shows that this method can provide guidance for the safe and stable operation of uranium tailings pond. © 2023, Akadémiai Kiadó, Budapest, Hungary.
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英文
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Influence of fiber type and amount of reinforcing fibers on radon exhalation in uranium tailings’ overburden under high temperature environment
作者：
Chen, Yifan;Song, Juan;Xu, Zhenghua;Liu, Yong;Dai, Xingwang;...
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2023年332(2):243-250 ISSN：0236-5731
通讯作者：
Zhenghua Xu<&wdkj&>Yong Liu
作者机构：
[Lin, Dongying; Chen, Yifan; Dai, Xingwang; Yan, Chengyan; Song, Juan; Li, Xiangyang] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Xu, Zhenghua] Univ South China, Sch Math & Sci, Hengyang 421001, Hunan, Peoples R China.;[Liu, Yong; Li, Xiangyang] Hunan Prov Engn Technol Res Ctr Uranium Tailings T, Hengyang 421001, Hunan, Peoples R China.;[Liu, Yong; Li, Xiangyang] Hunan Prov Engn Res Ctr Radioact Control Technol U, Hengyang 421001, Hunan, Peoples R China.;[Liu, Yong] Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Guangdong, Peoples R China.
通讯机构：
[Zhenghua Xu] S;[Yong Liu] H;School of Mathematics and Science, University of South China, Hengyang, China<&wdkj&>Hunan Province Engineering Technology Research Centre of Uranium Tailings Treatment Technology, Hengyang, China<&wdkj&>Hunan Province Engineering Research Centre of Radioactive Control Technology in Uranium Mining and Metallurgy, Hengyang, China<&wdkj&>College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, China
关键词：
glass fiber;polypropylene;radon;Article;correlation analysis;environmental temperature;gas diffusion;high temperature;radon exhalation;soil degradation;uranium mining
摘要：
Soil cohesion can be improved with reinforcement treatment. Glass fiber, polypropylene fiber, jute, and other commonly used organic and inorganic fiber materials were used as experimental materials to investigate the effect of reinforcement fiber type and dosage on radon exhalation in uranium tailings overlying soil under high temperature environment, and soil samples with different fiber types and dosages were prepared for radon exhalation test. The correlation analysis method was used to investigate the relationship between the radon exhalation law and the type and amount of reinforcing fibers in the overburden, and a linear function was constructed between the radon exhalation rate and the type and amount of reinforcing fibers. The results show that the radon exhalation rate of the jute reinforcement treatment is the lowest under the same dosage, followed by the polypropylene reinforcement treatment, and the effect of the glass fiber reinforcement treatment is the worst, but the radon exhalation rate of all treatments is high. In plain soil, increasing the fiber reinforcement reduces the degree of soil cracking and the rate of radon exhalation. When the material source and cost are taken into account, the jute reinforcement treatment can achieve a lower radon exhalation rate. © 2023, Akadémiai Kiadó, Budapest, Hungary.
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英文
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大学物理实验信息化教学体系构建与应用
作者：
饶益花;唐益群;陈铀;彭志华
期刊：
大学教育 ,2023年(02):92-94 ISSN：2095-3437
作者机构：
南华大学数理学院
关键词：
大学物理实验;信息化;教学体系;在线课程;虚拟仿真
摘要：
文章探索构建大学物理实验信息化教学体系的具体路径，打造大学物理实验线上线下、虚实结合多元混合式教学模式。该教学体系成功应用于2020年春季学期线上授课，完成了既定的教学任务，达到了课程教学目标，教学效果令人满意。
语种：
中文
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Experimental study on radon exhalation and dynamic response of uranium tailings dam under earthquake
作者：
Chen, Yifan;Chen, Yan;Dai, Xingwang;Lin, Dongyin;Liu, Yong;...
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2022年331(10):4179-4188 ISSN：0236-5731
通讯作者：
Zhenghua Xu
作者机构：
[Chen, Yifan; Lin, Dongyin; Dai, Xingwang; Chen, Yan] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Chen, Yifan; Lin, Dongyin; Dai, Xingwang; Xu, Zhenghua; Liu, Yong; Chen, Yan] Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Hunan, Peoples R China.;[Liu, Yong] Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Guangdong, Peoples R China.;[Xu, Zhenghua] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Zhenghua Xu] H;Hunan Province Engineering Technology Research Centre of Uranium Tailings Treatment Technology, Hengyang, China<&wdkj&>School of Mathematics and Physics, University of South China, Hengyang, China
关键词：
Earthquake;Shaking table test;The dynamic response;Radon exhalation rate
摘要：
Acceleration, displacement, stress response, and other dynamic response topics are currently the key topics of research. Because uranium tailings reservoirs are radioactive, earthquakes can also cause radon to be released. In order to monitor the acceleration response, displacement (both surface and interior), and radon exhalation rate of the dam body of the uranium tailings reservoir under various seismic peak accelerations, the shaker model test is used. When the peak acceleration is 0.7g, the displacement swings even more visibly, and when the peak acceleration is 1.0g, the surface of the dam shows clear fissures. However, the radon response will be quicker and stronger, and as the acceleration of the seismic peak keeps rising, the response gets stronger and stronger. As a result, the dynamic reaction can also be determined from the radon response. The findings of the tests can be used as a guide for the safe and stable operation of uranium tailings reservoirs. © 2022, Akadémiai Kiadó, Budapest, Hungary.
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The variation of uranium tailings impoundment cover fissures and radon exhalation under the continuous heat and insolation conditions
作者：
Dai, Xingwang;Fang, Shijie;Lin, Dongying;Wu, Xianwei;Chen, Zhangkai;...
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2022年331(11):4503-4511 ISSN：0236-5731
通讯作者：
Yong Liu<&wdkj&>Yifan Chen
作者机构：
[Lin, Dongying; Chen, Yifan; Dai, Xingwang; Chen, Zhangkai] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Fang, Shijie] Univ South China, Sch Elect Engn, Hengyang 421001, Hunan, Peoples R China.;[Wu, Xianwei] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.;[Liu, Yong] Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518000, Guangdong, Peoples R China.
通讯机构：
[Yong Liu] C;[Yifan Chen] S;College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, China<&wdkj&>School of Resources Environmental and Safety Engineering, University of South China, Hengyang, China
关键词：
aluminum oxide;calcium oxide;ferric oxide;oxide;radon;silicon dioxide;sodium oxide;sulfur trioxide;titanium dioxide;unclassified drug;uranium;water;air;Article;chemical composition;China;concentration (parameter);correlation coefficient;electric conductivity;fissure ratio;heat;mathematical parameters;mine tailings;radon exhalation rate;soil layer;soil moisture;sunlight;surface soil
摘要：
To study the law of uranium tailings impoundment cover fissures and radon exhalation under the continuous heat and insolation conditions, the soil and uranium tailings samples from South China are made into the uranium tailings impoundment scale mode. The model was placed in a climate chamber for continuous heat and insolation environments. The fissures rate, radon exhalation rate and electrical conductivity of the model soil layer were calculated and analyzed. The results show that: (1) the radon exhalation rate and fissure ratio have the same variation pattern (2) the electrical conductivity characterization correlates with fracture rate and precedes fracture rate, which may predict the fissure growth. (3) When the experimental time exceeded 21h, the electrical conductivity and the radon exhalation rate change showed a strong inverse correlation. © 2022, Akadémiai Kiadó, Budapest, Hungary.
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Preliminary research on the evolution laws of overburden soil structure and its radon reduction ability for uranium tailings impoundment in extreme heat and insolation conditions
作者：
Chen, Yifan;Lin, Dongying;Dai, Xingwang;Wu, Xianwei;Hong, Changshou;...
期刊：
Journal of Radioanalytical and Nuclear Chemistry ,2021年330(3):1007-1015 ISSN：0236-5731
通讯作者：
Liu, Yong
作者机构：
[Lin, Dongying; Hong, Changshou; Chen, Yifan; Dai, Xingwang; Liu, Yong] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Hong, Changshou; Liu, Yong] Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Peoples R China.;[Hong, Changshou; Liu, Yong] Hunan Prov Engn Res Ctr Radioact Control Technol, Hengyang 421001, Peoples R China.;[Lin, Dongying; Chen, Yifan; Dai, Xingwang] Univ South China, Sinosteel Maanshan Inst Min Res PostgraduateTrain, Hengyang 421001, Hunan, Peoples R China.;[Wu, Xianwei] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Liu, Yong] U;[Liu, Yong] H;Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Peoples R China.;Hunan Prov Engn Res Ctr Radioact Control Technol, Hengyang 421001, Peoples R China.
关键词：
radon;uranium;Article;controlled study;environmental parameters;extreme hot weather;fractal analysis;moisture;radiation protection;radon exhalation rate;soil structure;sunlight
摘要：
A series of simulation experimentations are carried out on the overburden soil of the uranium tailings impoundment under the conditions of heat and insolation. The results show that: (1) The radon exhalation rate on the overburden soil of the uranium tailings impoundment increases rapidly at first and then slows down with the decrease of the moisture content. (2) The radon exhalation rate increases rapidly at first and then slows down with the increase of fractal dimension. The fitting formula of the influence of moisture content and fractal dimension on radon exhalation rate can be used to guide the radiation protection design and construction of the uranium tailings impoundment. © 2021, Akadémiai Kiadó, Budapest, Hungary.
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《大学物理实验》课程思政探索与实践
作者：
饶益花;唐益群;管亮;刘应传;李寰;...
期刊：
广西物理 ,2021年42(04):42-45 ISSN：1003-7551
作者机构：
南华大学数理学院
关键词：
大学物理实验;课程思政;思政素材;价值观;世界观
摘要：
分析了大学物理实验课程内容和特点,提出了挖掘大学物理实验课程思政素材的方法,探索了课程教学中主题思政的融入,着重引导学生建立乐观向上的价值观和辩证唯物主义世界观。
语种：
中文
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大学物理课程在线教学创新设计与实践
作者：
陈铀;尹岚;饶益花
期刊：
科技风 ,2021年(01):61-62 ISSN：1671-7341
作者机构：
南华大学数理学院物理教研室 湖南衡阳 421001;[饶益花; 尹岚; 陈铀] 南华大学
关键词：
线上教学;课程建设;教学开展;直播教学平台
摘要：
从线上课程前期准备、线上课程建设、线上教学的开展方面对大学物理课程线上教学开展进行了设计与实践,通过教学反馈为以后的线上线下混合式教学提供有益的参考。
语种：
中文
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快速电子动量与动能的相对论关系虚拟仿真实验的教学应用
作者：
饶益花;唐益群;刘应传;陈铀;丁风;...
期刊：
物理实验 ,2020年40(10):47-50 ISSN：1005-4642
作者机构：
南华大学数理学院;[黄新成; 丁风] 安徽省科大奥瑞科技有限公司;[刘应传; 饶益花; 唐益群; 陈铀] 南华大学
关键词：
快速电子;动量;动能;相对论关系;虚拟仿真;在线教学
摘要：
对开发的快速电子动量与动能相对论关系虚拟仿真实验进行了教学应用研究.设计了仿真实验教学过程,明确了实验教学目标;由测量数据得到了快速电子动量与动能的相对论关系曲线.利用网络技术虚拟仿真实验可大规模普及为常规在线教学实验.
语种：
中文
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基于组件开发及动画技术的快速电子动量与动能的相对论关系虚拟仿真实验
作者：
饶益花;管亮;唐益群;陈铀;黄新成;...
期刊：
物理实验 ,2020年40(01):30-34 ISSN：1005-4642
作者机构：
南华大学数理学院,湖南衡阳,421001;安徽省科大奥瑞科技有限公司,安徽合肥,230089;[饶益花; 管亮; 唐益群; 陈铀] 南华大学;[黄新成; 丁风] 安徽省科大奥瑞科技有限公司
关键词：
快速电子;动量;动能;相对论关系;虚拟仿真实验
摘要：
开发了快速电子动量与动能的相对论关系虚拟仿真实验,利用3D仿真、三维动画、HTML5、数学建模等技术构建了虚拟仿真实验仪器;利用组件开发技术构建虚拟实验场景和实验过程,直观显示快速粒子在磁场中的运动轨迹,使实验生动形象,提升了学习兴趣;可以利用网络技术大规模普及实验,节省实验成本,把"高危"实验变为安全普及型常规教学实验.
语种：
中文
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Wideband tapered slot antenna for applications in ground penetrating radar
作者：
Raza, Ali;Lin Wenbin* ;Chen Yanzheng;Zhang Yanting;Chattha, Hassan Tariq;...
期刊：
Microwave and Optical Technology Letters ,2020年62(7):2562-2568 ISSN：0895-2477
通讯作者：
Lin Wenbin
作者机构：
[Raza, Ali; Chen Yanzheng; Zhang Yanting; Lin Wenbin] Southwest Jiaotong Univ, Sch Phys Sci & Technol, Chengdu, Peoples R China.;[Raza, Ali; Sharif, Abu Bakar] Govt Coll Univ Faisalabad, Dept Elect Engn, Faisalabad, Pakistan.;[Lin Wenbin] Univ South China, Sch Math & Phys, Hengyang, Peoples R China.;[Chattha, Hassan Tariq] Islamic Univ Madinah, Fac Engn, Dept Elect Engn, Al Madinah, Saudi Arabia.
通讯机构：
[Lin Wenbin] U;Univ South China, Sch Math & Phys, Hengyang, Peoples R China.
关键词：
Antenna grounds;Geological surveys;Geophysical prospecting;Microstrip antennas;Microwave antennas;Radar antennas;Slot antennas;Time domain analysis;Curved ground plane;Ground Penetrating Radar;Ground penetrating radar (GPR);Physical dimensions;Planar antennas;Resistively loaded antennas;Ta-pered-slot antennas;Wide-band;Ground penetrating radar systems
摘要：
A planar slotted patch antenna is proposed for ground penetrating radar (GPR). The proposed antenna has a wide bandwidth ranging from 600 MHz to 4 GHz. Tapered slot feeding, curved ground plane, and slot loading are used for a wideband operation, whereas resistive loading is utilized for removal of notch band. Current loops made by slots are bifurcated with the use of 50 Ω resistors. The antenna is designed and optimized to achieve good performance, especially at lower frequencies while keeping the antenna's physical dimension relatively small. The time-domain analysis of the antenna is performed, and the comparative graph is added after analysis to validate its performance in the impulse-based radar. Furthermore, a sandbox test is conducted; the experimental results show the significance of the proposed antenna toward GPR application. © 2020 Wiley Periodicals, Inc.
语种：
英文
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A magnetic-loop based monopole antenna for GPR applications
作者：
Raza, Ali;Lin, Wenbin* ;Liu, Yunlin;Sharif, Abu Bakar;Chen, Yanzheng;...
期刊：
Microwave and Optical Technology Letters ,2019年61(4):1052-1057 ISSN：0895-2477
通讯作者：
Lin, Wenbin
作者机构：
[Liu, Yunlin; Raza, Ali; Lin, Wenbin; Chen, Yanzheng] Southwest Jiaotong Univ, Sch Phys Sci & Technol, Chengdu, Sichuan, Peoples R China.;[Lin, Wenbin] Univ South China, Sch Math & Phys, Hengyang, Peoples R China.;[Sharif, Abu Bakar] Univ Elect Sci & Technol, Dept Microwave Engn, Chengdu, Sichuan, Peoples R China.;[Ma, Cunliang] Jiangxi Univ Sci & Technol, Sch Informat Engn, Ganzhou, Peoples R China.
通讯机构：
[Lin, Wenbin] U;Univ South China, Sch Math & Phys, Hengyang, Peoples R China.
关键词：
Antenna grounds;Geological surveys;Geophysical prospecting;Ground penetrating radar systems;Loop antennas;Magnetism;Monopole antennas;Radar antennas;Slot antennas;Time domain analysis;Ultra-wideband (UWB);Electrical trees;GPR applications;Ground Penetrating Radar;Ground planes;Low-frequency;Magnetic loops;Multiple applications;Planar antennas;Microwave antennas
摘要：
A new planar antenna is proposed for multiple applications in ground-penetrating radar. The proposed antenna offers ultra-wide band characteristics ranging from 100 MHz to 6 GHz. The antenna composed of two elements: an electrical tree-shaped portion and a magnetic loop antenna, made by joining an electrical antenna with a ground plane via 50 Ohm resistor. The loop antenna portion provides a low-frequency operation without increasing physical size of the antenna. Proposed antenna has relatively small dimensions 20 × 22.5 cm 2 as compared with similar antennas covering the same bandwidth. Time domain analysis of this antenna is done to check its performance for applications in impulse-based radar systems. The antenna has been manufactured and experimental results are added to validate simulation results. © 2018 Wiley Periodicals, Inc.
语种：
英文
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Stability of a stochastic discrete mutualism system
作者：
Liao, Xinyuan* ;Chen, Yuming
期刊：
Advances in Difference Equations ,2019年2019(1):1-10 ISSN：1687-1839
通讯作者：
Liao, Xinyuan
作者机构：
[Liao, Xinyuan] Univ South China, Sch Math & Phys, Hengyang, Peoples R China.;[Chen, Yuming] Wilfrid Laurier Univ, Dept Math, Waterloo, ON, Canada.
通讯机构：
[Liao, Xinyuan] U;Univ South China, Sch Math & Phys, Hengyang, Peoples R China.
关键词：
Asymptotic mean square stability;Stochastic discrete mutualism model;Linearized method;Lyapunov functional method
摘要：
Under the assumption that stochastic white noise perturbations are directly proportional to the deviation of the state from the equilibrium states of a continuous mutualistic model, we use the Euler–Maruyama discretization method to obtain a two-species stochastic discrete mutualism model. For this stochastic model, we establish conditions on the asymptotic mean square stability of the positive equilibrium state and the almost sure asymptotic stability of the three boundary equilibrium states. The theoretical results are supported with numerical simulations. © 2019, The Author(s).
语种：
英文
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Modeling of the control of the driven current profile in ICRF MCCD on EAST plasma
作者：
Yin, L.;Yang, C.;Gong, X. Y.* ;Lu, X. Q.;Cao, J. J.;...
期刊：
AIP Advances ,2018年8(5):055315 ISSN：2158-3226
通讯作者：
Gong, X. Y.
作者机构：
[Du, D.; Chen, Y.; Gong, X. Y.; Yin, L.] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Chen, Y.; Cao, J. J.; Wu, Z. Y.; Yin, L.; Lu, X. Q.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Yang, C.] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China.
通讯机构：
[Gong, X. Y.] U;Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
摘要：
Control of the current profile is a crucial issue for improved confinement and the inhibition of instability in advanced tokamak operation. Using typical discharge data for the Experimental Advanced Superconducting Tokamak, numerical simulations of driven-current profile control in mode conversion current drive (MCCD) in the ion cyclotron range of frequencies were performed employing a full-wave method and Ehst-Karney efficiency formula. Results indicate that the driven current profile in MCCD can be effectively modified by shifting the mode conversion layer. The peak of the driven current can be located at an aimed position in the normalized minor radius range (-0.60≤r/a≤0) by changing the radiofrequency and the minority-ion concentration. The efficiency of the off-axis MCCD can reach 233 kA/MW through optimization, and the mode converted ion cyclotron wave plays an important role in such scenarios. The effects of electron temperature and plasma density on the driven current profile are also investigated. © 2018 Author(s).
语种：
英文
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A novel unidirectional multi-dipole broadband antenna element
作者：
Chen, Yanzheng;Lin, Wenbin* ;Ma, Cunliang* ;Liao, Cheng
期刊：
Microwave and Optical Technology Letters ,2018年60(12):2983-2988 ISSN：0895-2477
通讯作者：
Lin, Wenbin;Ma, Cunliang
作者机构：
[Lin, Wenbin; Liao, Cheng; Chen, Yanzheng] Southwest Jiaotong Univ, Sch Phys Sci & Technol, Chengdu, Sichuan, Peoples R China.;[Lin, Wenbin] Univ South China, Sch Math & Phys, Hengyang, Peoples R China.;[Ma, Cunliang] Jiangxi Univ Sci & Technol, Sch Informat Engn, Ganzhou, Peoples R China.
通讯机构：
[Lin, Wenbin] U;[Ma, Cunliang] J;Univ South China, Sch Math & Phys, Hengyang, Peoples R China.;Jiangxi Univ Sci & Technol, Sch Informat Engn, Ganzhou, Peoples R China.
关键词：
broadband antenna;multi-dipole;unidirectional antenna
摘要：
A novel wideband unidirectional multi-dipole antenna is proposed, which has an enhanced impedance bandwidth of about 68.1% for VSWR < 1.5 and a gain > 8 dBi, covering the frequency region from 1.54 to 3.13 GHz. A stable radiation pattern is obtained and the 3 dB beamwidth is 62 ± 4° at E-plane and 63 ± 4° at H-plane over the bandwidth. This model has been manufactured, and the experimental results are in good accordance with the simulated ones. © 2018 Wiley Periodicals, Inc.
语种：
英文
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托卡马克等离子体环向转动对测地声模的影响
作者：
谢宝艺;余俊;龚学余;陈铀;余江妹
期刊：
核聚变与等离子体物理 ,2017年37(1):8-13 ISSN：0254-6086
作者机构：
南华大学数理学院,衡阳,421001;[龚学余] 南华大学数理学院,衡阳 421001;[龚学余] 南华大学核科学技术学院,衡阳 421001;[陈铀; 余江妹; 余俊; 谢宝艺] 南华大学
关键词：
环向转动;测地声模;低频模;声波分支;无碰撞阻尼
摘要：
采用回旋动理学方程推导得到了环向转动托卡马克等离子体中测地声模的色散关系,分析了环向转动对测地声模、低频模和声波分支的频率以及无碰撞阻尼率的影响。结果表明,测地声模的频率会随着环向转动马赫数而逐渐增大,而其无碰撞阻尼率则会随着环向转动马赫数而迅速减小。此外,低频模和声波分支的频率以及无碰撞阻尼率都会随着环向转动马赫数而逐渐减小,其中环向转动对声波分支的频率以及无碰撞阻尼率的影响非常小,基本上可以忽略。
语种：
中文
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ICRF fast wave current drive and mode conversion current drive in EAST tokamak
作者：
Yin, L.;Yang, C.;Gong, X. Y.* ;Lu, X. Q.;Du, D.;...
期刊：
PHYSICS OF PLASMAS ,2017年24(10):102502 ISSN：1070-664X
通讯作者：
Gong, X. Y.
作者机构：
[Du, D.; Chen, Y.; Yin, L.] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Chen, Y.; Gong, X. Y.; Yin, L.; Lu, X. Q.] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Yang, C.] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China.
通讯机构：
[Gong, X. Y.] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
plasma radiofrequency heating;plasma toroidal confinement;Tokamak devices
摘要：
Fast wave in the ion-cyclotron resonance frequency (ICRF) range is a promising candidate for non-inductive current drive (CD), which is essential for long pulse and high performance operation of tokamaks. A numerical study on the ICRF fast wave current drive (FWCD) and mode-conversion current drive (MCCD) in the Experimental Advanced Superconducting Tokamak (EAST) is carried out by means of the coupled full wave and Ehst-Karney parameterization methods. The results show that FWCD efficiency is notable in two frequency regimes, i.e., integral >= 85 MHz and integral = 50-65 MHz, where ion cyclotron absorption is effectively avoided, and the maximum on-axis driven current per unit power can reach 120 kA/MW. The sensitivity of the CD efficiency to the minority ion concentration is confirmed, owing to fast wave mode conversion, and the peak MCCD efficiency is reached for 22% minority-ion concentration. The effects of the wave-launch position and the toroidal wavenumber on the efficiency of current drive are also investigated. Published by AIP Publishing.
语种：
英文
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