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Long radial coherence of electron temperature fluctuations in non-local transport in HL-2A plasmas

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Chinese Physics B 2024年第2期33卷 413-420页

作者：石中兵方凯锐李景春邹晓岚卢兆旸闻杰王占辉丁玄同陈伟杨曾辰蒋敏季小全佟瑞海李永高施陪万钟武律许敏 Southwestern Institute of Physics Chengdu 610041China Department of Earth and Space Sciences Southern University of Science and TechnologyShenzhen 518055China Shenzhen Key Laboratory of Nuclear and Radiation Safety College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China CEA IRFMSaint-Paul-lez-Durance 13108France

The dynamics of long-wavelength(kθ<1.4 cm^(-1)),broadband(20 kHz–200 kHz)electron temperature fluctuations(Te/Te)of plasmas in gas-puff experiments are observed for the first time in HL-2A *** a relatively low density(ne(0)■0.91×10^(19)m^(-3)–1.20×10^(19)m^(-3))scenario,after gas-puffing the core temperature increases and the edge temperature *** the contrary,temperature fluctuation drops at the core and increases at the *** show the non-local emergence is accompanied with a long radial coherent length of turbulent *** in a higher density(ne(0)?1.83×10^(19)m^(-3)–2.02×10^(19)m^(-3))scenario,the phenomena are not ***,compelling evidence indicates that E×B shear serves as a substantial contributor to this extensive radial *** finding offers a direct explanatory link to the intriguing core-heating phenomenon witnessed within the realm of non-local transport.

关键词： nuclear fusion non-local transport tokamak gas-puffing

Soft landing of runaway currents by ohmic field in J-TEXT tokamak

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Plasma Science and Technology 2020年第11期22卷 11-22页

作者： Jie HU Wei YAN ruihai tong Wei LI Zhongyong CHEN Anjue DAI Duwei HUANG Yunong WEI Tiankui MA Yuan HUANG Yang LI Wei ZHENG Zhifang LIN You LI Huaiyu YANG Duoqin WANG Wei BAI Yu ZHONG Jiangang FANG J-TEXT Team International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and Tech no logyWuhan 430074People's Republic of China Southwestern Institute of Physics Chengdu 610041.People's Republic of China Chengdu University Chengdu 610106People's Republic of China Beibu Gulf University Qinzhou 535000People's Republic of China

Recently,experimental studies on the soft landing of RE current by ohmic(OH)field have been performed in J-TEXT tokamak,as a possible auxiliary method to dissipate the RE *** optimized horizontal displacement control of the RE beam,the toroidal electric field has been scanned from 1.6 to—0.3 V m^-1 during the RE plateau *** growth rate of RE currents and the evolution of hard x-ray(HXR)emissions have been *** is found that when the toroidal electric field is less than 7-12 times the theoretical critical electric field,the decay of REs could be *** dissipation rate by the ohmic field can reach a maximum value of 3 MA s^-***,the results of HXR spectra analysis indicate the different behaviors of HXR emissions under the condition of different toroidal electric *** analysis of the ionized argon emissions and magnetic fluctuations shows that under the condition of different toroidal electric fields,the physical process of RE generation may be different.

关键词： tokamak disruption runaway electron hard x-ray

Study of the fast electron behavior in electron cyclotron current driven plasma on J-TEXT

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Plasma Science and Technology 2022年第6期24卷 45-52页

作者： Xiaobo ZHANG Wei YAN Zhongyong CHEN Jiangang FANG Junli ZHANG You LI Xixuan CHEN Yunong WEI ruihai tong Zhifang LIN Yu ZHONG Lingke MOU Feng LI Weikang ZHANG Lu WANG Donghui XIA Zhonghe JIANG Zhoujun YANG Nengchao WANG Zhipeng CHEN Yonghua DING Yunfeng LIANG Yan PAN the J-TEXT Team International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Southwestern Institute of Physics Chengdu 610041People's Republic of China School of Electrical Engineering&Automation Jiangsu Normal UniversityXuzhou 221116People's Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung—PlasmaphysikD-52425 JülichGermany

In J-TEXT tokamak,fast electron bremsstrahlung diagnostic with 9 chords equipped with multichannel analyzer enables detailed studies of the generation and transport of fast *** spatial profiles and energy spectrum of the fast electrons have been measured in two ECCD cases with either on-axis or off-axis injection,and the profiles processed by Abel-inversion are consistent with the calculated power deposition ***,it is observed that the energy of fast electrons increases rapidly after turning off the ECCD,which may be attributed to the acceleration by the recovered loop voltage at low electron density.

关键词： fast electron tokamak electron cyclotron current drive power deposition location

Corn phytochemicals and their health benefits

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Food Science and Human Wellness 2018年第3期7卷 185-195页

作者： Siyuan Sheng tong Li ruihai Liu Department of Food Science Cornell UniversityIthacaNY14850-7201United States

Whole grain has a wide range of phytochemicals exhibiting health benefits of lowering risk of chronic *** commonly consumed grain product,corn has unique profiles of nutrients and phytochemicals when compared with other whole *** nutrients and phytochemicals include vitamins(A,B,E,and K),minerals(Mg,P,and K),phenolic acids(ferulic acid,coumaric acid,and syringic acid),carotenoids and flavonoids(anthocyanins),and dietary *** and more scientific evidences have shown that regular consumption of whole grain corn lowers the risk of developing chronic diseases such as cardiovascular disease,type 2 diabetes,and obesity and improves digestive *** studies on bioactive compounds of corn related to health are needed.

关键词： Corn Maize Whole grains Phytochemicals Cardiovascular disease Resistant starch Type II diabetes Diet and chronic diseases

Wild pink bayberry free phenolic extract induces mitochondria-dependent apoptosis and G0/G1 cell cycle arrest through p38/MAPK and PI3K/Akt pathway in MDA-MB-231 cancer cells

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Food Science and Human Wellness 2023年第5期12卷 1510-1518页

作者： Wen Xia Ersheng Gong Yanyun Lin Bisheng Zheng Wenhan Yang tong Li Sheng Zhang Peng Li ruihai Liu Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health(111 Center) School of Food Science and EngineeringSouth China University of TechnologyGuangzhou 510641China School of Public Health and Health Management Gannan Medical UniversityGanzhou 341000China Key Laboratory of Tropical Crop Products Processing of Ministry of Agriculture and Rural Affairs Agricultural Products Processing Research InstituteChinese Academy of Tropical Agricultural SciencesZhanjiang 524001China Department of Food Science Cornell UniversityIthaca 14853USA Stem Cell Research and Cellular Therapy Center Affi liated Hospital of Guangdong Medical UniversityZhanjiang 524001China

Polyphenol-rich foods have been shown to be good for cancer prevention as powerful antioxidants. In this study, the mechanisms of wild pink bayberry free phenolic extract(WPBFE)inhibiting the proliferation and inducing apoptotic of MDA-MB-231 breast cancer cells was examined. The main phenolic acids and flavonols in WPBFE were gallic acid((18.83 ± 0.44)μg/g FW)and myricetin((1.52 ± 0.05)μg/g FW), respectively. The maximum inhibition rate of WPBFE at non-cytotoxicity dose(below 80 mg/mL)was 81%. Western blotting analysis showed that WPBFE could cause the arrest of cell cycle in G0/G1 phase by down-regulating expression levels of PCNA, CDK4, cyclin D1 and up-regulating the expression level of p21. Meanwhile, WPBFE induced apoptosis through initiating the mitochondrial death pathway by up-regulating cleaved caspase-3 and enhancing the ratio of Bax/Bcl-2, with the maximum expression levels of 1.29 and 2.03 folds that of control group, respectively. Further study of the upstream protein, we found that WPBFE down-regulated TRAF2, while upregulated p-ASK1, p-p38 and p-p53. Furthermore, WPBFE could down-regulate the expression of p-PI3K and p-Akt. These observations indicated that WPBFE might play an anticancer role through regulating the p38 MAPK together with PI3K/Akt pathway.

关键词： Phenolic extract Breast cancer Cell cycle Apoptosis Cell proliferation

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变压器绕组对局部放电电磁波传播特性的影响

西安交通大学学报 2015年第4期49卷 6-11页

作者：赵煦孟永鹏成永红邹琳刘通李锐海西安交通大学电力设备电气绝缘国家重点实验室西安710049 南方电网电力科学研究院广州510080

为了研究变压器绕组对局部放电电磁波传播特性的影响,根据一台330kV变压器绕组的实际结构,建立了变压器绕组仿真计算模型。采用时域有限差分法（FDTD）研究了局部放电发生在绕组内部和外部时,变压器绕组对电磁波时域波形幅值的衰减规律... 详细信息

为了研究变压器绕组对局部放电电磁波传播特性的影响,根据一台330kV变压器绕组的实际结构,建立了变压器绕组仿真计算模型。采用时域有限差分法（FDTD）研究了局部放电发生在绕组内部和外部时,变压器绕组对电磁波时域波形幅值的衰减规律,以及在相同的条件下绕组对局部放电电磁波频谱分布的影响,并通过与无障碍空间中传播时局部放电电磁波的频率特性进行对比,得到了局部放电电磁波不同频率段的频率幅值和,及其在总频率幅值和中所占的比例。研究发现：绕组对内部放电和外部放电产生的局部放电电磁波传播特性的影响不同,绕组对内部放电产生的不同频率段电磁波的幅值有增强的作用,而且对1 000-2 500MHz高频段的增强作用比其他频率段强;绕组对外部放电产生的电磁波幅值有较强衰减作用,穿过绕组后电磁波的幅值至少衰减为无障碍空间时幅值的70%。

关键词：变压器局部放电电磁波传播特性

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精细化聚氨酯薄膜鱼眼的形成机理及抑制

高分子材料科学与工程 2020年第3期36卷 96-102页

作者：魏艳红冯川桂黄桐李泽汉李瑞海四川大学高分子科学与工程学院四川成都610065

以热塑性聚氨酯(TPU)薄膜为样本,研究TPU薄膜表面存在的颗粒状凸起(聚合物鱼眼)的形成机理。文中通过红外光谱、凝胶渗透色谱和扫描电镜等测试手段,充分研究了鱼眼和非鱼眼区域的化学结构和表面形态的差异。凭借差示扫描量热法和热重分... 详细信息

以热塑性聚氨酯(TPU)薄膜为样本,研究TPU薄膜表面存在的颗粒状凸起(聚合物鱼眼)的形成机理。文中通过红外光谱、凝胶渗透色谱和扫描电镜等测试手段,充分研究了鱼眼和非鱼眼区域的化学结构和表面形态的差异。凭借差示扫描量热法和热重分析评估其热性能。结果表明,鱼眼区域相对分子质量略高于非鱼眼区域,且两者化学结构不存在显著差异。此外,由于聚氨酯粒料硬段区域氢键聚集,结晶度偏高,制得的TPU薄膜的熔融温度范围为160~200℃,高于工业生产实际加工温度,导致结晶部分不能完全熔融,未熔融颗粒冷却形成鱼眼。研究反驳了工业上将聚合物鱼眼视为物理杂质或超高相对分子质量聚合物的理论,为降低TPU等一类低结晶度聚合物薄膜鱼眼含量提供了理论依据。

关键词：聚氨酯薄膜鱼眼化学结构热性能熔点

基于高分子结晶分析方法的液体硅橡胶老化机制研究

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中国电机工程学报 2014年第9期34卷 1462-1470页

作者：陈灿王希林贾志东李桐陆海曾向君李锐海清华大学电机系北京市海淀区100084 清华大学深圳研究生院广东省深圳市518055 南方电网科学研究院有限责任公司广东省广州市510080

近年来,中国的南方电网地区一些变电站SF6电压、电流互感器的液体硅橡胶绝缘护套出现龟裂老化现象,这一现象的出现会导致护套表面变白,粉化,硬度上升,受到外力后出现不可恢复的裂纹,并且憎水性和耐漏电起痕性能大大下降。对发生老化的... 详细信息

近年来,中国的南方电网地区一些变电站SF6电压、电流互感器的液体硅橡胶绝缘护套出现龟裂老化现象,这一现象的出现会导致护套表面变白,粉化,硬度上升,受到外力后出现不可恢复的裂纹,并且憎水性和耐漏电起痕性能大大下降。对发生老化的液体硅橡胶材料进行了试验研究和分析,并选取不同老化程度的液体硅橡胶材料进行了X射线衍射分析、X射线光电子能谱分析等手段研究了其微观结构和物质组成的变化。研究发现老化后的硅橡胶表面结构和官能团发生了明显变化,Si—C键减少,C元素相对含量下降,O元素相对含量增加,体系交联度上升并且观察到了晶体结构。这一研究为液体硅橡胶绝缘护套的老化机制和老化程度的评估提供了依据,同时也为互感器伞套的修复补强以及防老化措施建立了基础。

关键词：液体硅橡胶龟裂老化 X射线衍射分析 X射线光电子能谱分析交联反应高分子结晶化

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高压直流XLPE电缆研究现状

绝缘材料 2014年第1期47卷 22-25页

作者：王亚吕泽鹏吴锴王霞刘通李锐海西安交通大学电力设备电气绝缘国家重点实验室西安710049 南方电网科学研究院有限责任公司广州510080

介绍了国际高压直流输电电缆绝缘的应用情况,概述了高压直流电缆的空间电荷与直流电缆测试方法的研究情况,展望了高压直流电缆材料及测试技术的发展方向。

关键词：高压直流 XLPE电缆纳米技术空间电荷老化直流电缆测试技术