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Molecular Dynamics Simulation of Xe Behavior in U-Mo Alloys Fuel

Chinese Physics Letters 2014年第4期31卷 130-133页

作者： XIAO Hong-Xing TANG Rui TIAN Xiao-Feng LONG Chong-Sheng Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Chengdu 610041 The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059

Classical molecular dynamics simulations are used to investigate the fission gas Xe behavior in a U-Mo alloy fuel matrix. The embedded atom method potential proposed by Smirnova et al. is used to describe the U-Mo-Xe system. The results show that the initial configuration of interstitial Xe atoms in U-Mo alloys is very instable and has a strong tendency to get together and to form a Xe bubble by ejecting the adjacent U atoms and Mo atoms from their former normal lattice sites. The pressure in Xe bubbles is initially quite high and then drops with increasing Xe concentration obviously. The matrix swelling of U-Mo alloys associated with the Xe bubble growth follows approximately a linear relationship with the ratio of Xe to U at low Xe concentration while the rate of swelling increases rapidly at high Xe concentration. The simulation results are in good agreement with the experimental data. The recovery of the damaged structure in the U-Mo alloys matrix is also investigated. It is shown that a damaged structure cannot be recovered completely after a system is relaxed for a long time while still having lots of defects.

关键词： MOLECULAR dynamics -- Simulation methods XENON THERMAL properties FISSION gases SWELLING of materials NUCLEATION

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Design and modeling of a micro piezoelectric electric generating device with adjustable resonance frequency

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Journal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao 2015年第5期36卷 403-411页

作者： Chen, Guang-Zhu Fu, Hai-Ling Meng, Qing-Chun Bao, Jiu-Sheng College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059 China School of Mechanical Engineering Xi'an Jiaotong University Xi'an 710049 China School of Mechanical and Electrical Engineering China University of Mining and Technology Xuzhou 221116 China

Aiming at the inconvenience of energy supplying for microelectronic devices, a micro piezoelectric electric generating device working based on surrounding vibrations was designed in this paper. As the device may harvest a biggest energy when it is resonating with the surrounding vibrations, its resonance frequency was designed adjustable with the span of piezoelectric vibrators. What is more, the harvesting performance of the micro generating device was investigated by theoretical modeling and finite element analyzing methods. It is found that the resonance frequency rises with the span increasing and the variation can be 500Hz or more. The output voltage depends on the structure parameters of the piezoelectric vibrators. By contrast, it rises with the increasing of vibrator's length while decreases with the increasing of metal substrate's thickness and the linearity between them are all well. However, it rises first then falls with the increasing of both the vibrator's width and the piezoelectric ceramic piece's thickness. The optimal interval values of the width and the thickness are 4~5mm and 0.4~0.5mm, respectively. The theoretical calculations have similar variation trends with the finite element simulations. However, there are some differences between them as the joint points are not included when calculating the equivalent mass which should be noticed in actual applications. It is believed that this work may provide an effective technological way for energy supplying of low energy microelectronic products such as wireless sensor network nodes and so on. © 2015, Chinese Mechanical engineering Society. All right reserved.

关键词： Vibrators

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Plasmonic metalens based on coupled resonators for focusing of surface plasmons

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Scientific Reports 2016年第1期6卷 1-8页

作者： Xu, Quan Zhang, Xueqian Xu, Yuehong Li, Quan Li, Yanfeng Ouyang, Chunmei Tian, Zhen Gu, Jianqiang Zhang, Wentao Zhang, Xixiang Han, Jiaguang Zhang, Weili Center for Terahertz Waves College of Precision Instrument and Optoelectronics Engineering Tianjin University Key Laboratory of Optoelectronics Information and Technology Ministry of Education Tianjin 300072 China Cooperative Innovation Center of Terahertz Science Chengdu 610054 China College of Electrical Engineering and Automation Guilin University of Electronic Technology Guilin 541000 China Divison of Physical Science and Engineering King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia School of Electrical and Computer Engineering Oklahoma State University Stillwater 74078 OK United States

As an essential functionality, flexible focusing of surface plasmons (SPs) is of particular interest in nonlinear optics and highly integrated plasmonic circuitry. Here, we developed a versatile plasmonic metalens, a metasurface comprised of coupled subwavelength resonators, whose optical responses exhibit a remarkable feature of electromagnetically induced transparency (EIT). We demonstrate numerically and experimentally how a proper spatial design of the unit elements steers SPs to arbitrary foci based on the holographic principles. More specifically, we show how to control the interaction between the constituent EIT resonators to efficiently manipulate the focusing intensity of SPs. We also demonstrated that the proposed metalens is capable of achieving frequency division multiplexing. The power and simplicity of the proposed design would offer promising opportunities for practical plasmonic devices.

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A Novel SPSA Kernel Wavelet Neural Network for Model-free PID Controller

A Novel SPSA Kernel Wavelet Neural Network for Model-free PI...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Yuxin Zhao Xue Du Genglei Xia Renfeng Jia College of Automation Harbin Engineering University College of Nuclear Science and Technology Harbin Engineering University

ISBN: (纸本)9781479917631

Model-free PID control tuning methods have been widely reported for the case with the time-varying uncertain systems. A model-free control system is introduced in this paper with PID controller. This control design could be considered as a contribution to kernel wavelet neural network PID controllers in model-free system with a straightforward tuning by the simultaneous perturbation stochastic approximation algorithm. It is particularly well suited to problems involving the measurement data without prior inner structure knowledge of the unknown system. On the other hand, neural network activation functions are bounded which cause the outputs of neural network to be limited. Therefore, the T-S Fuzzy control method on basis of kernel wavelet neural network (KWNN) is introduced to improve the control parameter tuning adaptivity in terms of boundedness of the KWNN excitation function. Finally, simulation results are presented to exhibit the effectiveness of the proposed IPWR control system.

关键词： KWNN algorithm PID control T-S fuzzy SPSA algorithm Proportional Integral Derivative Control Wavelet neural networks Proportional derivative control design control measurement data TRANS-SHIPMENT Seeds Simulation results control systems tuning Neural network control parameter

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The influence of velocity variation on the adhesive contact behavior and the deformation of substrate based on molecular dynamics method

The influence of velocity variation on the adhesive contact ...

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International Conference on engineering Tribology technology, ICETT 2014

作者： Chen, Jingjing Huang, Jianmeng Liu, Yang Gao, Shengfu Li, Ning School of Mechanical Engineering and Automation Fuzhou University Fuzhou350108 China School of Mechatronics Engineering University of Electronic Science and Technology of China Chengdu611731 China School of Civil Engineering and Transportation South China University of Technology Guangzhou510641 China School of Engineering College Zhejiang Normal University Jinhua321004 China

ISBN: (纸本)9783038354581

The adhesive contact behavior between an indenter and a single crystal copper substrate is performed to investigated based on the EAM(embedded atomic method) and the Morse potentials and the verlet algorithm. The influences of velocity on the contact behavior and substrate deformation are studied and analyzed. It is found that the single crystal copper material's resist deformation level is limited by low velocity, and more dislocated atoms are accumulated under the moving direction of indenter in higher velocity. Moreover, the contact force presents a serrated increase trend because of the atomic reconstruction, phase transition and the atom dislocation is damaged during indenting process. It is seen obviously that chip volume is thickened by the sliding speed and sliding distance increase in slipping process. The contact (friction, normal) force and temperature on the contact area plays a significant role in the elastic-plastic substrate deformation during the whole moving process. Furthermore, the dislocated band in basis lies at the angle of 45 degrees with the moving direction of indenter. © 2015 Trans Tech Publications, Switzerland.

关键词： Molecular dynamics

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Search of low-mass WIMPs with a p-type point contact germanium detector in the CDEX-1 experiment

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Physical Review D 2016年第9期93卷 092003-092003页

作者： W. Zhao Q. Yue K. J. Kang J. P. Cheng Y. J. Li H. T. Wong S. T. Lin J. P. Chang J. H. Chen Q. H. Chen Y. H. Chen Z. Deng Q. Du H. Gong X. Q. Hao H. J. He Q. J. He H. X. Huang T. R. Huang H. Jiang H. B. Li J. Li J. M. Li X. Li X. Y. Li Y. L. Li F. K. Lin S. K. Liu 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 L. T. Yang S. W. Yang N. Yi C. X. Yu H. Yu X. Z. Yu M. Zeng X. H. Zeng Z. Zeng L. Zhang Y. H. Zhang M. G. 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 Institute of Physics Academia Sinica Taipei 11529 College of Physical Science and Technology Sichuan University Chengdu 610064 NUCTECH Company Beijing 10084 YaLong River Hydropower Development Company Chengdu 610051 School of Physics Nankai University Tianjin 300071 Department of Nuclear Physics China Institute of Atomic Energy Beijing 102413 Department of Physics Banaras Hindu University Varanasi 221005

The CDEX-1 experiment conducted a search of low-mass (<10 GeV/c2) weakly interacting massive particles dark matter at the China Jinping Underground Laboratory using a p-type point-contact germanium detector with a fiducial mass of 915 g at a physics analysis threshold of 475 eVee. We report the hardware setup, detector characterization, data acquisition, and analysis procedures of this experiment. No excess of unidentified events is observed after the subtraction of the known background. Using 335.6 kg-days of data, exclusion constraints on the weakly interacting massive particle-nucleon spin-independent and spin-dependent couplings are derived.

关键词： Particle dark matter Weakly interacting massive particles Dark matter detectors

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The large enriched germanium experiment for neutrinoless double beta decay (LEGEND)

arXiv

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arXiv 2017年

作者： Abgrall, N. Abramov, A. Abrosimov, N. Abt, I. Agostini, M. Agartioglu, M. Ajjaq, A. Alvis, S.I. Avignone, F.T. Bai, X. Balata, M. Barabanov, I. Barabash, A.S. Barton, P.J. Baudis, L. Bezrukov, L. Bode, T. Bolozdynya, A. Borowicz, D. Boston, A. Boston, H. Boyd, S.T.P. Breier, R. Brudanin, V. Brugnera, R. Busch, M. Buuck, M. Caldwell, A. Caldwell, T.S. Camellato, T. Carpenter, M. Cattadori, C. Cederkäll, J. Chan, Y.-D. Chen, S. Chernogorov, A. Christofferson, C.D. Chu, P.-H. Cooper, R.J. Cuesta, C. Demidova, E.V. Deng, Z. Deniz, M. Detwiler, J.A. Di Marco, N. Domula, A. Du, Q. Efremenko, Yu. Egorov, V. Elliott, S.R. Fields, D. Fischer, F. Galindo-Uribarri, A. Gangapshev, A. Garfagnini, A. Gilliss, T. Giordano, M. Giovanetti, G.K. Gold, M. Golubev, P. Gooch, C. Grabmayr, P. Green, M.P. Gruszko, J. Guinn, I.S. Guiseppe, V.E. Gurentsov, V. Gurov, Y. Gusev, K. Hakenmüeller, J. Harkness-Brennan, L. Harvey, Z.R. Haufe, C.R. Hauertmann, L. Heglund, D. Hehn, L. Heinz, A. Hiller, R. Hinton, J. Hodak, R. Hofmann, W. Howard, S. Howe, M.A. Hult, M. Inzhechik, L.V. Janicskó Csáthy, J. Janssens, R. Ješkovský, M. Jochum, J. Johansson, H.T. Judson, D. Junker, M. Kaizer, J. Kang, K. Kazalov, V. Kermaïdic, Y. Kiessling, F. Kirsch, A. Kish, A. Klimenko, A. Knöpfle, K.T. Kochetov, O. Konovalov, S.I. Kontul, I. Kornoukhov, V.N. Kraetzschmar, T. Kröninger, K. Kumar, A. Kuzminov, V.V. Lang, K. Laubenstein, M. Lazzaro, A. Li, Y.L. Li, Y.-Y. Li, H.B. Lin, S.T. Lindner, M. Lippi, I. Liu, S.K. Liu, X. Liu, J. Loomba, D. Lubashevskiy, A. Lubsandorzhiev, B. Lutter, G. Ma, H. Majorovits, B. Mamedov, F. Martin, R.D. Massarczyk, R. Matthews, J.A.J. McFadden, N. Mei, D.-M. Mei, H. Meijer, S.J. Mengoni, D. Mertens, S. Miller, W. Miloradovic, M. Mingazheva, R. Misiaszek, M. Moseev, P. Myslik, J. Nemchenok, I. Nilsson, T. Nolan, P. O'Shaughnessy, C. Othman, G. Panas, K. Pandola, L. Papp, L. Pelczar, K. Peterson, D. Pettus, W. Poon, A.W.P. Povinec, P.P. Institute for Nuclear and Particle Astrophysics and Nuclear Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States National Research Centre "Kurchatov Institute Moscow Leibniz Institute for Crystal Growth Berlin Germany Max-Planck-Institut für Physik München Germany Gran Sasso Science Institute L'Aquila Italy Department of Physics Dokuz Eylül University Buca Izmir Turkey Center for Experimental Nuclear Physics and Astrophysics Department of Physics University of Washington SeattleWA98195 United States Department of Physics and Astronomy University of South Carolina ColumbiaSC29208 United States Oak Ridge National Laboratory Oak RidgeTN37830 United States South Dakota School of Mines and Technology Rapid CitySD57701 United States Italy Institute for Nuclear Research of the Russian Academy of Sciences Moscow Russia Physik-Institut University of Zürich Zürich Switzerland Moscow115409 Russia Joint Institute for Nuclear Research Dubna Russia University of Liverpool Liverpool United Kingdom Department of Physics and Astronomy University of New Mexico AlbuquerqueNM87131 United States Department of Nuclear Physics and Biophysics Comenius University Bratislava Slovakia Dipartimento di Fisica e Astronomia dell'Universita' di Padova Padova Istituto Nazionale di Fisica Nucleare Padova Italy Department of Physics Duke University DurhamNC27708 United States Triangle Universities Nuclear Laboratory DurhamNC27708 United States Department of Physics and Astronomy University of North Carolina Chapel HillNC27514 United States Physik Department Technische Universität München Germany Argonne National Laboratory ArgonneIL60439 United States Istituto Nazionale di Fisica Nucleare Milano Biocca Milano Italy Lund University Lund Sweden Department of Engineering Physics Tsinghua University Beijing China Los Alamos National Laboratory Los AlamosNM87545 United States Technische Universität Dresden Dresden Germany Co

The observation of neutrinoless double-beta decay (0νββ) would show that lepton number is violated, reveal that neutrinos are Majorana particles, and provide information on neutrino mass. A discovery-capable experiment covering the inverted ordering region, with effective Majorana neutrino masses of 15 − 50 meV, will require a tonne-scale experiment with excellent energy resolution and extremely low backgrounds, at the level of ∼0.1 count /(FWHM·t·yr) in the region of the signal. The current generation 76Ge experiments GERDA and the Majorana Demonstrator, utilizing high purity Germanium detectors with an intrinsic energy resolution of 0.12%, have achieved the lowest backgrounds by over an order of magnitude in the 0νββ signal region of all 0νββ experiments. Building on this success, the LEGEND collaboration has been formed to pursue a tonne-scale 76Ge experiment. The collaboration aims to develop a phased 0νββ experimental program with discovery potential at a half-life approaching or at 1028 years, using existing resources as appropriate to expedite physics results. Copyright © 2017, The Authors. All rights reserved.

关键词： Germanium

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An experimental study on bubble dynamic behavior in microbubble emission boiling 23

An experimental study on bubble dynamic behavior in microbub...

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23rd International Conference on nuclear engineering: nuclear Power - Reliable Global Energy, ICONE 2015

作者： Tang, Jiguo Yan, Changqi Sun, Licheng Hou, Xiaofan Wu, Xiangcheng Xu, Huiqiang Chen, Hanying Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin Heilongjiang China State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and Hydropower Sichuan University Chengdu Sichuan China

ISBN: (纸本)9784888982566

Recently, the thermal emission issued from many components and devices in engineering fields has exceeded 10 MW/m2. The common cooling methods have not met the requirement. Microbubble emission boiling (MEB) is expected for being employed to solve the problem due to its high heat transfer performance. A high-speed video camera (Fastcam SA5) was employed to study bubble dynamic behavior in MEB visually for improving the understanding of it. Experimental results showed that the bubble behavior of MEB differed from both nucleate boiling and film boiling. In the regime of MEB, a large irregular bubble would form on the heating surface and break up rapidly afterwards, but not departure from the heating surface. The period of bubble ebullition was shorter and the change rate of bubble radius was higher in MEB than those in other boiling modes. A dimensionless analysis showed that the wall superheat and heat flux had great impact on the variation of dimensionless bubble radius in MEB, while had slight influence on that in other boiling modes. The inertia effects increasingly dominated the condensation and collapse process with the increase in wall superheat and heat flux for MEB. Copyright © 2015 by JSME.

关键词： Heat flux

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Introduction of RAVONSICS project

Introduction of RAVONSICS project

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作者： ZENG Hai YANG Ming YOSHIKAWA Hidekazu Engineering Center State Nuclear Power Automation System Engineering Company College of Nuclear Science and Technology Harbin Engineering University

This paper introduces the international cooperative research project called RAVONSICS(Reliability and Verification and Validation of nuclear Safety I&C Software) which is being carried on by 7 Chinese partners including universities, research institutes, utilities, vendors, and safety regulatory body. The objective of RAVONSICS is to bring forwards the methodological development in China for the software reliability evaluation and the software verification technique. The paper gives brief summary of the background, research topics, and the present status of RAVONSICS project. RAVONSICS works cooperatively with its European sister project HARMONICS,where the both projects will share the common target to improve the software reliability evaluation and testing methodologies and techniques.

关键词： software reliability verification and validation digital I&C safety-critical system

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Shallowly discussing the humanity design of urban public facilities

Shallowly discussing the humanity design of urban public fac...

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2nd International Conference on Advances in Energy and Environmental Science, ICAEES 2014

作者： Hu, Chuan-Mei College of Applied Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu Sichuan province 610059 China

ISBN: (纸本)9783038352099

The influence factors of humanity design of public facilities contain four aspects: natural environment, human environment, regional culture and human factors. The principles that humanity design of public facilities should be obey to meet the needs of people's activities, people's psychology, the organic unity of the man and materialized, to achieve the artistic beauty and meet the cultural identity. Humanity design can cause the user's thoughts resonate with the designer, and it can promote the sustainable development of urban public facilities because of its mutual integration with the environment. © (2014) Trans Tech Publications, Switzerland.

关键词： Sustainable development

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