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Constraints on axion couplings from the CDEX-1 experiment at the China Jinping Underground Laboratory

Physical Review D 2017年第5期95卷 052006-052006页

作者： S. K. Liu Q. Yue K. J. Kang J. P. Cheng H. T. Wong Y. J. Li H. B. Li S. T. Lin J. P. Chang J. H. Chen N. Chen Q. H. Chen Y. H. Chen Z. Deng Q. Du H. Gong H. J. He Q. J. He H. X. Huang H. Jiang J. M. Li J. Li X. Li X. Q. Li X. Y. Li Y. L. Li F. K. Lin L. C. Lü H. Ma J. L. Ma S. J. Mao J. Q. Qin J. Ren X. C. Ruan V. Sharma M. B. Shen L. Singh M. K. Singh A. K. Soma J. Su C. J. Tang J. M. Wang L. Wang Q. Wang S. Y. Wu Y. C. Wu Z. Z. Xianyu R. Q. Xiao H. Y. Xing F. Z. Xu Y. Xu X. J. Xu T. Xue C. W. Yang L. T. Yang S. W. Yang N. Yi C. X. Yu H. Yu X. Z. Yu X. H. Zeng Z. Zeng L. Zhang Y. H. Zhang M. G. Zhao W. Zhao Z. Y. Zhou J. J. Zhu W. B. Zhu X. Z. Zhu Z. H. Zhu Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics Tsinghua University Beijing 100084 College of Physical Science and Technology Sichuan University Chengdu 610064 Institute of Physics Academia Sinica Taipei 11529 NUCTECH Company Beijing 100084 YaLong River Hydropower Development Company Chengdu 610051 Department of Nuclear Physics China Institute of Atomic Energy Beijing 102413 School of Physics Nankai University Tianjin 300071 Department of Physics Banaras Hindu University Varanasi 221005

We report the results of searches for solar axions and galactic dark matter axions or axionlike particles with the CDEX-1 experiment at the China Jinping Underground Laboratory, using 335.6 kg days of data from a p-type point-contact germanium detector. The data are compatible with the background model, and no excess signals are observed. Limits of solar axions on the model-independent coupling gAe<2.5×10−11 from Compton, bremsstrahlung, atomic-recombination, and deexcitation channels and gANeff×gAe<6.4×10−17 from a Fe57 M1 transition at 90% confidence level are derived. Within the framework of the Dine-Fischler-Srednicki-Zhitnitskiy and Kim-Shifman-Vainshtein-Zakharov models, our results exclude the axion mass heavier than 0.9 and 177 eV/c2, respectively. The derived constraints for dark matter axions below 1 keV improve over the previous results.

关键词： Particle dark matter Axions Dark matter detectors

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Research on off-line quantification method of transient stability 8th

Research on off-line quantification method of transient stab...

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8th Asia-Pacific Power and Energy engineering Conference, APPEEC 2016

作者： Liu, D. Liu, Q.Y. Zhao, R.G. Liu, Q.F. Liu, R.H. Ziyang Company of Sichuan Electrical Power Company ZiyangSichuan Province China School of Automation and Engineering University of Electronic Science and Technology Chengdu China CHINAGUODIAN Sichuan Ashine Power Co. Ltd Chengdu China Sichuan Electric Vocational and Technical College China

ISBN: (纸本)9781138028463

Energy margin based on Lyapunov direct method has been considered as an important index to quantify the transient stability of power system. Especially its on-line application has been paid much attention. Based on the classical equations of rotor motion, the transient energy function model is first established in this paper. Then the converting relationship between the potential energy boundary surface and the stability region characteristics is described. Based on these, the second kick method and the interpolation method based on the property of potential energy boundary are combined to calculate the maximum of the potential energy. At last, the energy margin model is established based on the maximum of potential energy and the transient energy. The simulation results in three-machine and IEEE-30 bus system and the comparison with CUEP verify the effectiveness and feasibility of the proposed method, which can be used in off-line assessment of transient stability of power system. © 2016 Taylor & Francis Group, London.

关键词： Potential energy

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The Dynamics Studies of a Four-axle Bogie of Locomotive

The Dynamics Studies of a Four-axle Bogie of Locomotive

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成都理工大学核技术与自动化工程学院六十周年校庆大会

作者： ZHANG Xiao-xia MA Yu-qiang Technology Center of CSR Qishuyan Institute Co. Ltd 213011 Changzhou People's Republic of China College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu of Sichuan Prov. 610059 People's Republic of China

A type of bogie structure was proposed for the eight-axle locomotive, of which the middel bogie forme was used to connect the two B0 bogie and support the car body with three suspensions.A single drawbar connect the B0 bogie and car body directly to transfer the longitudinal *** structure is simple and feasibility, which can achieve high adhesion availabillity and good dynamic *** suspension can achieve a excellent stability of car *** with a same speed and axle load class 2C0 locomotive, the wheelset lateral force and wheel rim wear factor are reduced by about 35% at the R300 m small radius curves, and the wheelset lateral force is decreased by 15%, and the rim wear factor is reduced by 23% at the R800 m curves.

关键词： eight-axle locomotive four-axle bogie curve passing dynamic performance axle-load transfer

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The first result on 76Ge neutrinoless double beta decay from CDEX-1 experiment

arXiv

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arXiv 2017年

作者： Li, Wang Qian, Yue KeJun, Kang JianPing, Cheng YuanJing, Li Henry, Wong TszKing ShinTed, Lin JianPing, Chang JingHan, Chen QingHao, Chen YunHua, Chen Zhi, Deng Qiang, Du Hui, Gong Li, He QingJu, He JinWei, Hu HanXiong, Huang TengRui, Huang LiPing, Jia Hao, Jiang HauBin, Li Hong, Li JianMin, Li Jin, Li Jun, Li Xia, Li XinYing, Li XueQian, Li YuLan, Li FongKay, Lin ShuKui, Liu Hao, Ma JingLu, Ma XingYu, Pan Jie, Ren XiChao, Ruan ManBin, Shen Vivek, Sharma Lakhwinder, Singh Kumar, Singh Manoj Kumar, Singh Manoj Kumar, Soma Arun Jian, Su ChangJian, Tang WeiYou, Tang ChaoHsiung, Tseng JiMin, Wang Qing, Wang ShiYong, Wu Wei, Wu YuCheng, Wu HaoYang, Xing Yin, Xu Tao, Xue LiTao, Yang SongWei, Yang Nan, Yi ChunXu, Yu HaiJun, Yu WeiHe, Zeng XiongHui, Zeng Zhi, Zeng Lan, Zhang YunHua, Zhang MingGang, Zhao Wei, Zhao SuNing, Zhong JiFang, Zhou ZuYing, Zhou JingJun, Zhu WeiBin, Zhu ZhongHua, Zhu Department of Engineering Physics Tsinghua University Beijing100084 China College of Physical Science and Technology Sichuan University Chengdu610064 China Department of Nuclear Physics China Institute of Atomic Energy Beijing102413 China School of Physics Nankai University Tianjin300071 China NUCTECH Company Beijing10084 YaLong River Hydropower Development Company Chengdu610051 Institute of Physics Academia Sinica Taipei11529 Taiwan Department of Physics Banaras Hindu University Varanasi221005 India

We report the first result on 76Ge neutrinoless double beta decay from CDEX-1 experiment at China Jinping Underground Laboratory. A mass of 994 g p-type point-contact high purity germanium detector has been installed to search the neutrinoless double beta decay events, as well as to directly detect dark matter particles. An exposure of 304 kg∙day has been analyzed. The wideband spectrum from 500 keV to 3 MeV was obtained and the average event rate at the 2.039 MeV energy range is about 0.012 count per keV per kg per day. The half-life of 76Ge neutrinoless double beta decay has been derived based on this result as: T0v1/2 > 6.4×1022 yr (90% C.L.). An upper limit on the effective Majorana-neutrino mass of 5.0 eV has been achieved. The possible methods to further decrease the background level have been discussed and will be pursued in the next stage of CDEX experiment. Copyright © 2017, The Authors. All rights reserved.

关键词： Point contacts

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Experimental Research on the Friction and Wear Properties of a Contact Strip of a Pantograph-catenary System at the Sliding Speed of 350 km/h with Electric Current

Experimental Research on the Friction and Wear Properties of...

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成都理工大学核技术与自动化工程学院六十周年校庆大会

作者： YANG H J CHEN G.X. GAO G.Q. WU G.N. Zhang W.H. The college of nudear technology and automation engineering Chengdu university of technologyChengd State key laboratory of traction power tribology research institute southwest jiaotong university

The friction and wear properties of a contact strip in a contact strip rubbing against a contact wire were studied.A series of experimental tests on the vibration between the contact strip and contact wire were conducted on a high-speed block-on-ring tester under the conditions of electric current of 0 A and 250 A,sliding speed of 200~350 km/h and normal loads of 120 *** electron microscopy (SEM) and optical microscopy (OM) were used to observe morphology of the wom *** results indicate that the vibration of the contact strip is aggravated with increasing sliding *** contrast with those without electric current, the friction coefficient of the strip against the contact wire decreases and the wear rate increases obviously with increasing sliding *** the increase of the sliding speed, the contact surface temperature between the strip and contact wire with electric current grows *** arc discharge becomes stronger and stronger with the sliding speed, which results in aggravated arc erosion wear on the surface of the *** wear and arc erosion wear are two main wear mechanisms for the strip against contact wire with electric current of 250 A when the sliding speed is bigger than 250 km/h.

关键词： sliding wear sliding friction electrical contacts carbon strip

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Limits on light WIMPs with a 1 kg-scale germanium detector at 160 eVee physics threshold at the China Jinping Underground Laboratory

arXiv

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arXiv 2017年

作者： Yang, L.T. Li, H.B. Yue, Q. Kang, K.J. Cheng, J.P. Li, Y.J. Wong, H.T. Aǧartioǧlu, M. An, H.P. Chang, J.P. Chen, J.H. Chen, Y.H. Deng, Z. Du, Q. Gong, H. He, L. Hu, J.W. Hu, Q.D. Huang, H.X. Jia, L.P. Jiang, H. Li, H. Li, J.M. Li, J. Li, X. Li, X.Q. Li, Y.L. Lin, F.K. Lin, S.T. Liu, S.K. Liu, Z.Z. Ma, H. Ma, J.L. Pan, H. Ren, J. Ruan, X.C. Sevda, B. Sharma, V. Shen, M.B. Singh, L. Singh, M.K. Tang, C.J. Tang, W.Y. Tian, Y. Wang, J.M. Wang, L. Wang, Q. Wang, Y. Wu, S.Y. Wu, Y.C. Xing, H.Y. Xu, Y. Xue, T. Yang, S.W. Yi, N. Yu, C.X. Yu, H.J. Yue, J.F. Zeng, X.H. Zeng, M. Zeng, Z. Zhang, Y.H. Zhao, M.G. Zhao, W. Zhou, J.F. Zhou, Z.Y. Zhu, J.J. Zhu, Z.H. Department of Engineering Physics Tsinghua University Beijing100084 China Department of Physics Tsinghua University Beijing100084 China Institute of Physics Academia Sinica Taipei11529 Taiwan NUCTECH Company Beijing 100084 YaLong River Hydropower Development Company Chengdu610051 College of Physical Science and Technology Sichuan University Chengdu610064 China Department of Nuclear Physics China Institute of Atomic Energy Beijing102413 China School of Physics Nankai University Tianjin300071 China Department of Physics Banaras Hindu University Varanasi221005 India

We report results of a search for light weakly interacting massive particle (WIMP) dark matter from the CDEX-1 experiment at the China Jinping Underground Laboratory (CJPL). Constraints on WIMP-nucleon spin-independent (SI) and spin-dependent (SD) couplings are derived with a physics threshold of 160 eVee, from an exposure of 737.1 kg-days. The SI and SD limits extend the lower reach of light WIMPs to 2 GeV and improve over our earlier bounds at WIMP mass less than 6 GeV. Copyright © 2017, The Authors. All rights reserved.

关键词： Germanium

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The Power Grid Probabilistic Vulnerability Evaluation Considering the Stochastic Perturbations of Wind Farm

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IOP Conference Series: Materials Science and engineering 2017年第1期199卷

作者： Qunying Liu Renguang Zhao Shuheng Chen Ruihua Liu Changhua Zhang School of Automation University of Electronic Science and Technology of China Chengdu 611731 Sichuan China School of Energy Science and Engineering University of Electronic Science and Technology of China Chengdu 611731 Sichuan China Sichuan Electric Vocational and Technical College Chengdu Sichuan China

Considering the stochastic volatility of load and wind farm, stochastic outage rate of generator, based on the combination of Cumulant and Gram-Charlier series (CGC), a new evaluation method for probabilistic vulnerability of transmission network is proposed. Firstly, the three-parameter Weibull distribution is adapted to describe the random variation of wind speed and the probabilistic model for wind turbine generator system is established. And then, in order to avoid complicating convolution and improve the computational speed, the vulnerability index of nodes and branches in power grid is proposed with the combination of Cumulant and Gram-Charlier series. Furthermore, the K-means clustering algorithm is adapted to evaluate the vulnerability of nodes and branches. The simulation results in IEEE30 bus system show that the proposed method can lead to a reliable and effective evaluation result.

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The application of neural network PID controller to control the light gasoline etherification

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IOP Conference Series: Earth and Environmental Science 2017年第1期69卷

作者： Huanxin Cheng Yimin Zhang Lingling Kong Xiangyong Meng College of Automation and Electrical Engineering Qingdao University of Science and Technology Qingdao 266042 China Research Institute of Physical & Chemical Engineering of Nuclear Industry Tianjin 300180 China

Light gasoline etherification technology can effectively improve the quality of gasoline, which is environmental- friendly and economical. By combining BP neural network and PID control and using BP neural network self-learning ability for online parameter tuning, this method optimizes the parameters of PID controller and applies this to the Fcc gas flow control to achieve the control of the final product- heavy oil concentration. Finally, through MATLAB simulation, it is found that the PID control based on BP neural network has better controlling effect than traditional PID control.

关键词：

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Performance assessment of CsI(Tl) screens on various substrates for X-ray imaging

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中国物理C（英文版） 2015年第7期39卷 102-106页

作者： FENG Zhao-Dong JIANG Peng ZHANG Hong-Kai ZHAO Bo-Zhen QIN Xiu-Bo WEI Cun-Feng LIU Yu Key Laboratory of Nuclear Radiation and Nuclear Energy Technology Institute of High Energy PhysicsChinese Academy of Sciences Beijing 100049 China Beijing Engineering Research Center of Radiographic Techniques and Equipment Beijing 100049 China University of Chinese Academy of Sciences Beijing 100049 China The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059 China Key Laboratory of Nuclear Radiation and Nuclear Energy Technology Institute of High Energy PhysicsChinese Academy of Sciences Beijing 100049 China Beijing Engineering Research Center of Radiographic Techniques and Equipment Beijing 100049 China

Thallium-doped cesium iodide (CsI(Tl)) screens are widely used in X-ray imaging devices because of the columnar structure of the CsI(Tl) layer,but few reports focus on the optical role of the substrate in the screen *** this paper,four substrates including fused silica (SiO2),silver-film coated SiO2,graphite (C) and fiber optic plate (FOP) are used to fabricate CsI(Tl) screens by thermal *** imaging performance is evaluated by relative light output (RLO),modulation transfer function (MTF),normalized noise power spectrum (NNPS) and noise equivalent quanta (NEQ).The results reveal that although CsI(Tl) film on graphite plate yields images with the lowest light output,it presents relatively higher spatial resolution and better signal-to-noise ***,films on SiO2 plate obtain low MTF but high NNPS curves,whether they are coated with silver film or ***,scintillation screens on FOP have bright images with low NNPS and high NEQ,but have the lowest *** controlling the substrate optical features,CsI(Tl) films can be tailored to suit a given application.

关键词： CsI(Tl) scintillation screen substrate imaging performance evaluation

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Multiphysics Integrated NDT&E and Progress on Eddy Current Pulsed Thermography

Studies in Applied Electromagnetics and Mechanics

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Studies in Applied Electromagnetics and Mechanics 2016年 41卷 141-148页

作者： Tian, Gui Yun Gao, Yunlai College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing210016 China School of Electrical and Electronic Engineering Newcastle University Newcastle upon TyneNE1 7RU United Kingdom School of Automation Engineering University of Electronic Science and Technology of China Chengdu611731 China

ISBN: (纸本)9781614996385

The paper introduces multimodality non-destructive testing and evaluation. Multiphysics integrated NDT&E approaches e.g. dual probe of EMAT and PEC, integrative MFL system, are reviewed. Different strengths and weakness are reported. Recent work on eddy current pulsed thermography as a new integrative ENDE system, is discussed. Their multiphysics and their interaction and quantitative analysis including simulation and data processing are investigated and evaluated. Case studies and future work are also reported. © 2016 The authors and IOS Press. All rights reserved.

关键词： Multiphysics

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