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Study of the spectrum effect on the threshold of resonant magnetic perturbation penetration on J-TEXT

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Plasma Science and Technology 2022年第12期24卷 16-25页

作者： feiyue MAO Nengchao WANG Zhuo HUANG Zhengkang REN Song ZHOU chengshuo SHEN Xiaoyi ZHANG Ying HE Qi ZHANG Ruo JIA Chuanxu ZHAO Yangbo LI Bo HU Da Li Abba Alhaji BALA Zhipeng chen Zhongyong chen Zhoujun YANG Yunfeng LIANG Yonghua DING Yuan 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 College of Computer Science South-Central Minzu UniversityWuhan 430074People's Republic of China Physics Department Federal University DutseDutse 720101JigawaNigeria Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikPartner of the Trilateral Euregio Cluster(TEC)Jülich 52425Germany Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China

The spectrum effect on the penetration of resonant magnetic perturbation(RMP) is studied with upgraded in-vessel RMP coils on *** poloidal spectrum of the RMP field,especially the amplitudes of 2/1 and 3/1 components,can be varied by the phase difference between the upper and lower coil rows,ΔΦ=Φ_(top)-Φ_(bottom),where Φ_(top)and Φ_(bottom)are the toroidal phases of the n=1 field of each coil *** type of RMP penetration is found to be related to ΔΦ,including the RMP penetration of either 2/1 or 3/1 RMP and the successive penetrations of 3/1 RMP followed by the 2/1 *** cases with penetration of only one RMP component,the penetration thresholds measured by the corresponding resonant component are close for variousΔΦ.However,the 2/1 RMP penetration threshold is significantly reduced if the 3/1 locked island is formed in *** changes in the rotation profile due to 3/1 locked island formation could partially contribute to the reduction of the 2/1 thresholds.

关键词： tokamak error field resonant magnetic perturbation mode penetration spectrum analysis

Investigation of electron cyclotron current drive efficiency on the J-TEXT tokamak

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Plasma Science and Technology 2022年第12期24卷 183-189页

作者： Jiangang FANG Wei YAN Zhongyong chen Xiaobo ZHANG Xixuan chen Junli ZHANG feiyue MAO You LI Lingke MOU Yu ZHONG Feng Li Weikang ZHANG Fanxi LIU Guinan ZOU Song ZHOU Da LI Li GAO Donghui XIA Zhoujun YANG Zhipeng chen Nengchao WANG Yonghua DING Yunfeng LIANG Yuan 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 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People's Republic of China Forschungszentrum Jülich GmbH Institut für Energie-und Klimaforschung-PlasmaphysikD-52425 JülichGermany

Electron cyclotron current drive(ECCD) efficiency research is of great importance for the neoclassical tearing mode(NTM) *** ECCD efficiency is beneficial for the NTM stabilization and the ECCD power threshold *** efficiency has been investigated on the J-TEXT *** electron cyclotron wave(ECW) power scan was performed to obtain the current drive *** current drive efficiency is derived to be approximately η_(0)=(0.06-0.16)×10^(19)A m^(-2)W^(-1)on the J-TEXT *** effect of the residual toroidal electric field has been included in the determination of the current drive efficiency,which will enhance the ECCD *** the plasma current of I_(p)=100 kA and electron density of n_(e)=1.5×10^(19)m^(-3),the ratio of Spitzer conductivity between omhic(OH)and ECCD phases is considered and the experimental data have been *** correction results show that the current drive efficiency η_(1)caused by the fast electron hot conductivity decreases by approximately 79%.It can be estimated that the driven current is approximately 24 kA at 300 kW ECW power.

关键词： electron cyclotron current drive current drive efficiency residual toroidal electric field

在套管中激发环向传播的准SH波的有限元模拟及实验研究

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地球物理学报 2022年第4期65卷 1519-1527页

作者：陈雪莲庄妍夏飞月殷晓康唐晓明中国石油大学(华东)地球科学与技术学院山东青岛266580 中国石油大学(华东)深层油气重点实验室山东青岛266580 中国石油大学(华东)机电工程学院山东青岛266580

目前评价固井质量的声波测井方法均是在井内泥浆中辐射声波,再耦合到套管中激发套管波,这种测量方式在重泥浆或含气的井筒内应用时受到了限制.本文将电磁超声换能器引入到套管井中,无需井内介质的声耦合直接在套管中激发沿着套管轴向偏... 详细信息

目前评价固井质量的声波测井方法均是在井内泥浆中辐射声波,再耦合到套管中激发套管波,这种测量方式在重泥浆或含气的井筒内应用时受到了限制.本文将电磁超声换能器引入到套管井中,无需井内介质的声耦合直接在套管中激发沿着套管轴向偏振、周向传播的准SH波.利用多物理场有限元仿真技术优化设计了磁盘阵列式的偏置磁场和跑道型线圈结构的电磁超声换能器,基于洛伦兹力机理实现了在铁磁材料的套管中激发和接收环向传播的准SH波的电磁超声转换技术.根据优化设计结构在实验室研制了电磁超声换能器,有限元模拟和实验室测量均观测到了沿套管环向传播的零阶及一阶准SH波.有限元模拟结果还显示在胶结良好的套管井中,准SH波一边沿着套管环向传播,一边向水泥环中辐射准SH波;在水泥和地层界面准SH波还会发生反射,再耦合到套管中被接收器接收到,通过对比硬地层和软地层两种套管井模型中接收的反射波信息,可观测到反射的准SH波相位相反,反射波和直达波的相位变化充分验证了准SH波的传播特征.

关键词：电磁超声换能器洛伦兹力准SH波套管井

维普期刊数据库博看期刊

Multi-mechanism Coalescence Design and Matrix Expression of Logic Action Sequences of the Over-turn Nursing Robot Part Ⅱ:Gesture-state in Sets and Matrix

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Multi-mechanism Coalescence Design and Matrix Expression of ...

Jagged-1–Hes-1 signaling inhibits the differentiation of Th17 cells

作者： Lizhi Gu Shanping Gao Chunyang Gu Yuantang Huang feiyue Xu Xiang Zhong Kai chen Jinling Song Key Laboratory of Virtual Manufacturing Technology of Fujian Universities Quanzhou University of Information Engineering College of Mechanical Engineering and Automation Huaqiao University The University of Nottingham Ningbo China Quanzhou Normal University

As is expressed in Part I,Functions and coalescence design of the over-turn nursing robot,the performance and requirements have been put forward with systematic design of several ***,in order to control and function well the over-turn nursing robot,the three-dimensional and five-dimensional Euclidean space with the real number were adopted in terms of sets for gesture of the bedridden person and the corresponding state of the robot,*** matrix method was employed to define and describe the gestures-robot performance and its transition *** gesture-state sequence matrix not only accurately and clearly expressed the gesture series,state sequence and their corresponding relations,but also laid a theoretical and technical foundation for the path planning from the current gesture to the target *** control and operation of 7 states and 5 gestures were done to realize the automation and intelligent over-turning safely,comfortably and conveniently.

关键词：

来源： cnki会议 cnki会议评论

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Jagged-1–Hes-1 signaling inhibits the differentiation of Th...

第八届全国免疫学学术大会

作者： Pengtao You chengquan Mao Zhencheng chen Xijian Lu Jingfang Di Shan Zeng Jing Liu feiyue Xing Institute of Tissue Transplantation and Immunology Department of Immunobiology Jinan University

Background:Notch signaling plays an important role in differentiation of T ***, little is known as to action of it in differentiation of Th17 cell ***:In this study, a soluble Jagged-1/Fc chimera protein(Jagged-1) was directly used to activate Jagged-1–Notch signaling, while Hes-1-gargeting siRNA was used to knock down Hes-1 gene to investigate effect of Jagged-1–Hes-1 signaling on the differentiation of CD4+ T cells into Th17 *** and Results:The results showed that Jagged-1 could promote the expression of Hes-1 and Deltex-1 mRNAs and the expression of NICD, Hes-1 and Deltex-1 proteins, which might be significantly blocked by DAPT, a specific inhibitor of Notch ***-1 or Hes-1-si R NA resulted in the markedly decreased in situ expression of RORγt in the CD4+ T cells induced by IL-6 plus TGF-β.Flow cytometric analysis showed the reduction of IL-17 production in CD4+ T cells by Jagged-1, but the enhancement of it by Hes-1-gargeting *** level of IL-10 produced by the treated cells was also enhanced, whereas the expression of IL-17 was prominently attenuated, which could be offset by anti-Jagged-1 antibody or ***:The results indicate that Jagged-1–Hes-1 signaling can suppress the skewing of CD4+ T cells toward Th17 cells via RORγt, for which hes-1 may be crucial.

关键词： Jagged-1 Hes-1 siRNA Th17 differentiation

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倾斜式模孔环模成型机能耗与成型密度分析

太阳能学报 2019年第10期40卷 2871-2877页

作者：曹永全孙姣于飞跃陈文义王序然河北工业大学过程装备与控制工程系天津300130 河北工业大学工程流动与过程强化研究中心天津300130 河北序然秸秆能源技术有限公司衡水253800

针对当前环模成型机成型密度低的问题,提出一种倾斜式模孔结构,推导出倾斜式模孔挤压能耗和成型密度模型,并分析各参数对倾斜式模孔成型性能的影响。结果表明:随着模孔倾斜角度从0°增加到20°,模孔挤压能耗增加43.6%,但成型密度提高75.... 详细信息

针对当前环模成型机成型密度低的问题,提出一种倾斜式模孔结构,推导出倾斜式模孔挤压能耗和成型密度模型,并分析各参数对倾斜式模孔成型性能的影响。结果表明:随着模孔倾斜角度从0°增加到20°,模孔挤压能耗增加43.6%,但成型密度提高75.5%;在倾斜式模孔中,挤压能耗随物料与孔壁间摩擦系数、物料泊松比及孔长的增大而增加,随物料与环模内壁间摩擦系数的增大而降低,随孔径的减小呈先减后增的趋势;成型密度则随各参数的增大而增大,且其增幅远大于能耗。

关键词：生物质压块受力分析能耗成型密度倾斜角

基于自适应频率窗经验小波变换的列车轮对轴承多故障诊断

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铁道学报 2019年第5期41卷 55-63页

作者：邓飞跃刘鹏飞陈恩利段修生石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室河北石家庄050043 石家庄铁道大学机械工程学院河北石家庄050043

针对列车轮对轴承故障信号复杂,尤其是在多故障并发情况下难以准确诊断的问题,提出了基于频率窗经验小波变换(EWT)的轮对轴承多故障诊断方法。首先对轴承多故障振动信号进行Fourier变换,引入一个带宽可变的滑动频率窗分割信号频谱;然后... 详细信息

针对列车轮对轴承故障信号复杂,尤其是在多故障并发情况下难以准确诊断的问题,提出了基于频率窗经验小波变换(EWT)的轮对轴承多故障诊断方法。首先对轴承多故障振动信号进行Fourier变换,引入一个带宽可变的滑动频率窗分割信号频谱;然后利用水循环优化算法(WCA),通过所提出的幅值包络谱相关峭度(ESCK)指标,自适应地确定轴承多故障中各单一故障所对应的最优频率窗位置;最后通过经验小波变换分解出单一故障信号,采用包络解调分析实现轴承复合故障准确诊断。轮对轴承多故障仿真和实际应用结果表明,所提方法能有效分离列车轮对轴承复合故障中的典型故障,有效降低轮对轴承多故障诊断的误诊率,具有一定的应用价值。

关键词：轮对轴承复合故障频率窗经验小波变换包络谱相关峭度

致密外壳整体增强Si3N4泡沫陶瓷的制备及性能

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硅酸盐学报 2020年第3期48卷 362-367页

作者：杨飞跃赵爽杨自春陈国兵袁硕伟海军工程大学动力工程学院武汉430032

采用反应烧结法制备氮化硅泡沫陶瓷,对坯体进行预埋粉处理,烧结得到厚度为500μm左右的致密外壳,最厚处可达693μm。经1400℃氮化6 h后,外壳的微观形貌为交错排列的晶柱状;氮化温度升至1450℃时,壳层中晶柱长度有所增加。氮化时间延长至... 详细信息

采用反应烧结法制备氮化硅泡沫陶瓷,对坯体进行预埋粉处理,烧结得到厚度为500μm左右的致密外壳,最厚处可达693μm。经1400℃氮化6 h后,外壳的微观形貌为交错排列的晶柱状;氮化温度升至1450℃时,壳层中晶柱长度有所增加。氮化时间延长至10 h后,外壳的微观形貌均转变为粗晶柱状,降低了晶柱的长径比。外壳使泡沫陶瓷具有一定弹性(杨氏弹性模量为117–352 MPa),其抗压缩强度相对无外壳样品最高提升47%。并且,外部壳层的存在对泡沫陶瓷的开孔率、密度及导热系数影响非常小。

关键词：氮化硅泡沫陶瓷外壳晶体形貌抗压缩强度

低保对象为何退保难?动态分析策略下的退保模式及其变迁趋势研究

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社会 2019年第4期39卷 210-240页

作者：肖萌陈虹霖李飞跃天津师范大学应用社会学系复旦大学社会工作系南开大学经济学院

本文基于民政部2014年“中国城乡困难家庭社会政策支持系统建设”调查的数据,运用事件史分析方法,对城市低保接受时长和退保影响因素进行探究。研究发现,低保对象的救助接受时间呈现明显的长期化特点,但随着低保接受时间的延长,低保对... 详细信息

本文基于民政部2014年“中国城乡困难家庭社会政策支持系统建设”调查的数据,运用事件史分析方法,对城市低保接受时长和退保影响因素进行探究。研究发现,低保对象的救助接受时间呈现明显的长期化特点,但随着低保接受时间的延长,低保对象退保风险会逐渐上升。这与“时间依赖论”关于长期化救助接受会逐渐弱化救助对象工作伦理,进而造成救助退出可能性逐步下降的理论预设恰好相反,说明中国城市低保对象退保难与工作积极性下降无关。进一步的研究发现,弱势化的低保人口构成及就业救助服务缺失是长期低保接受的重要原因。此外,中国的非正规就业结构也对退保构成显著的不利影响,不过,该影响随着时代的发展在不断减弱。

关键词：低保社会救助退保难长期救助接受行为事件史分析