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Experimental study of infrasonic signal generation during rock fracture under uniaxial compression

International Journal of Rock Mechanics and Mining Sciences 2013年 60卷 37-46页

作者： Xing Zhu Qiang Xu Jianbin Zhou Minggao Tang State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China College of Automation Engineering Chengdu University of Technology Chengdu 610059 China

The low frequency infrasonic signals generated during micro fracture process of six types of rocks (including granite , mudstone , sandstone , phyllite , limestone and red sandstone) under uniaxial compression were detected. A specialized data collection system was developed for infrasonic signals sensing and analog-to-digital conversion. The wavelet-based de-noising method, Short-Time Fourier Transform (STFT) time-frequency analysis and accumulative ring-down count (ARC) of events were used to process and analyze digital infrasonic signals in order to investigate the characteristics of infrasonic emission (IE) event during rock micro fracture process. The experimental results indicate obvious infrasonic emission events before rock failure. The characteristic frequency typically ranges from about 2.0 to 8.0 Hz for the six kinds of rocks and it has no necessary relationship with structure or lithology . According to the ARC estimate, hard rocks (such as granite, limestone) can generate much more infrasonic emission events than soft ones (mudstone, phyllite), in other words, the brittle fracture is more prone to generate infrasonic signals. In addition, infrasound is an inaudible and low-attenuate signal that cannot be absorbed easily by water or air, and can propagate avoiding huge obstacles due to its long wavelength. The research results and the advantages of the infrasound will provide a beneficial supplement for our further studies on rock instability or rocky landslide in field combined with other advanced methods.

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Eddy current pulsed thermography for fatigue evaluation of gear

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AIP Conference Proceedings 2014年第1期1581卷 1652-1662页

作者： Gui Yun Tian Aijun Yin Bin Gao Jishan Zhang Brian Shaw School of Automation Engineering University of Electronic Science and Technology of China Chengdu Sichuan 611731 P. R. China and School of Electrical and Electronic Engineering Newcastle University Newcastle upon Tyne NE1 7RU United Kingdom State Key Laboratory of Mechanical Transmission College of Mechanical Engineering Chongqing University P. R. China and School of Electrical and Electronic Engineering Newcastle University Newcastle upon Tyne NE1 7RU United Kingdom Design Unit School of Mechanical Engineering and System Newcastle University Newcastle upon Tyne NE1 7RU United Kingdom

The pulsed eddy current (PEC) technique generates responses over a wide range of frequencies, containing more spectral coverage than traditional eddy current inspection. Eddy current pulsed thermography (ECPT), a newly developed non-destructive testing (NDT) technique, has advantages such as rapid inspection of a large area within a short time, high spatial resolution, high sensitivity and stand-off measurement distance. This paper investigates ECPT for the evaluation of gear fatigue tests. The paper proposes a statistical method based on single channel blind source separation to extract details of gear fatigue. The discussion of transient thermal distribution and patterns of fatigue contact surfaces as well as the non-contact surfaces have been reported. In addition, the measurement for gears with different cycles of fatigue tests by ECPTand the comparison results between ECPT with magnetic Barkhausen noise (MBN) have been evaluated. The comparison shows the competitive capability of ECPT in fatigue evaluation.

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Spectral Measurement of Electron Antineutrino Oscillation Amplitude and Frequency at Daya Bay

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Physical Review Letters 2014年第6期112卷 061801-061801页

作者： F. P. An A. B. Balantekin H. R. Band W. Beriguete M. Bishai S. Blyth R. L. Brown I. Butorov G. F. Cao J. Cao R. Carr Y. L. Chan J. F. Chang Y. Chang C. Chasman H. S. Chen H. Y. Chen S. J. Chen S. M. Chen X. C. Chen X. H. Chen Y. Chen Y. X. Chen Y. P. Cheng J. J. Cherwinka M. C. Chu J. P. Cummings J. de Arcos Z. Y. Deng Y. Y. Ding M. V. Diwan E. Draeger X. F. Du D. A. Dwyer W. R. Edwards S. R. Ely J. Y. Fu L. Q. Ge R. Gill M. Gonchar G. H. Gong H. Gong Y. A. Gornushkin W. Q. Gu M. Y. Guan X. H. Guo R. W. Hackenburg R. L. Hahn G. H. Han S. Hans M. He K. M. Heeger Y. K. Heng P. Hinrichs yk. Hor Y. B. Hsiung B. Z. Hu L. J. Hu L. M. Hu T. Hu W. Hu E. C. Huang H. X. Huang H. Z. Huang X. T. Huang P. Huber G. Hussain Z. Isvan D. E. Jaffe P. Jaffke S. Jetter X. L. Ji X. P. Ji H. J. Jiang J. B. Jiao R. A. Johnson L. Kang S. H. Kettell M. Kramer K. K. Kwan M. W. Kwok T. Kwok W. C. Lai W. H. Lai K. Lau L. Lebanowski J. Lee R. T. Lei R. Leitner A. Leung J. K. C. Leung C. A. Lewis D. J. Li F. Li G. S. Li Q. J. Li W. D. Li X. N. Li X. Q. Li Y. F. Li Z. B. Li H. Liang C. J. Lin G. L. Lin S. K. Lin Y. C. Lin J. J. Ling J. M. Link L. Littenberg B. R. Littlejohn D. W. Liu H. Liu J. C. Liu J. L. Liu S. S. Liu Y. B. Liu C. Lu H. Q. Lu K. B. Luk Q. M. Ma X. B. Ma X. Y. Ma Y. Q. Ma K. T. McDonald M. C. McFarlane R. D. McKeown Y. Meng I. Mitchell Y. Nakajima J. Napolitano D. Naumov E. Naumova I. Nemchenok H. Y. Ngai W. K. Ngai Z. Ning J. P. Ochoa-Ricoux A. Olshevski S. Patton V. Pec J. C. Peng L. E. Piilonen L. Pinsky C. S. J. Pun F. Z. Qi M. Qi X. Qian N. Raper B. Ren J. Ren R. Rosero B. Roskovec X. C. Ruan B. B. Shao H. Steiner G. X. Sun J. L. Sun Y. H. Tam H. K. Tanaka X. Tang H. Themann S. Trentalange O. Tsai K. V. Tsang R. H. M. Tsang C. E. Tull Y. C. Tung B. Viren V. Vorobel C. H. Wang L. S. Wang L. Y. Wang L. Z. Wang M. Wang N. Y. Wang R. G. Wang W. Wang W. W. Wang X. Wang Y. F. Wang Z. Wang Z. M. Wang D. M. Webber H. Wei Y. D. Wei L. J. Wen K. Whisnant C. G. White L. Whitehead T. Wise H. L. H. Wong S. C. F. Wong E. Worcester Q. Institute of High Energy Physics Beijing East China University of Science and Technology Shanghai University of Wisconsin Madison Wisconsin Brookhaven National Laboratory Upton New York Department of Physics National Taiwan University Taipei Joint Institute for Nuclear Research Dubna Moscow Region California Institute of Technology Pasadena California Chinese University of Hong Kong Hong Kong National United University Miao-Li Institute of Physics National Chiao-Tung University Hsinchu Nanjing University Nanjing Department of Engineering Physics Tsinghua University Beijing Shenzhen Univeristy Shenzhen North China Electric Power University Beijing Siena College Loudonville New York Department of Physics Illinois Institute of Technology Chicago Illinois Lawrence Berkeley National Laboratory Berkeley California Department of Physics University of California Berkeley California Department of Physics University of Illinois at Urbana-Champaign Urbana Illinois Chengdu University of Technology Chengdu Shanghai Jiao Tong University Shanghai Beijing Normal University Beijing College of William and Mary Williamsburg Virginia Department of Physics Yale University New Haven Connecticut Center for Neutrino Physics Virginia Tech Blacksburg Virginia China Institute of Atomic Energy Beijing University of California Los Angeles California Shandong University Jinan School of Physics Nankai University Tianjin Department of Physics University of Cincinnati Cincinnati Ohio Dongguan University of Technology Dongguan Department of Physics The University of Hong Kong Pokfulam Hong Kong Department of Physics University of Houston Houston Texas Charles University Faculty of Mathematics and Physics Prague University of Science and Technology of China Hefei Sun Yat-Sen (Zhongshan) University Guangzhou Joseph Henry Laboratories Princeton University Princeton New Jersey Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute Troy New York Chin

A measurement of the energy dependence of antineutrino disappearance at the Daya Bay reactor neutrino experiment is reported. Electron antineutrinos (ν¯e) from six 2.9 GWth reactors were detected with six detectors deployed in two near (effective baselines 512 and 561 m) and one far (1579 m) underground experimental halls. Using 217 days of data, 41 589 (203 809 and 92 912) antineutrino candidates were detected in the far hall (near halls). An improved measurement of the oscillation amplitude sin22θ13=0.090−0.009+0.008 and the first direct measurement of the ν¯e mass-squared difference |Δmee2|=(2.59−0.20+0.19)×10−3 eV2 is obtained using the observed ν¯e rates and energy spectra in a three-neutrino framework. This value of |Δmee2| is consistent with |Δmμμ2| measured by muon neutrino disappearance, supporting the three-flavor oscillation model.

关键词： ELECTRONIC antineutrino ENERGY security LIQUID scintillators PHOTOELECTRONS NEUTRINO oscillation

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The Space Distributions of Platinum Group Elements of the No.2 Ore Body in the Jinchuan Ni-Cu Sulfide Deposit, SW China

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Acta Geologica Sinica - English Edition 2014年第S2期88卷

作者： Liang WANG Liemeng CHEN Xieyan SONG Jinjin JIANG Zhiqiang FU The college of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059 China State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Guizhou Land Survey and Plan Institute Guiyang 550004 China

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End-point regulation of a flexible robotic manipulator under the unknown spatiotemporally varying disturbance

End-point regulation of a flexible robotic manipulator under...

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3rd IFAC Conference on Intelligent Control and automation Science, ICONS 2013

作者： Zhang, Shuang He, Wei Liu, Chang Huang, Deqing Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore Robotics Institute School of Automation Engineering University of Electronic Science and Technology of China Chengdu 611731 China School of Automation Engineering University of Electronic Science and Technology of China Chengdu 611731 China Department of Aeronautics Imperial College London London SW7 2AZ United Kingdom

ISBN: (纸本)9783902823458

In this paper, the end-point regulation problem is investigated for a flexible robotic manipulator under the spatiotemporally varying disturbance. By using the Hamilton's principle, the dynamics of the flexible robotic manipulator are represented by one partial differential equation (PDE) and five ordinary differential equations (ODEs). Boundary control is developed to drive the manipulator to the desired set-point and simultaneously suppress the vibrations of the flexible link. Considering the unknown spatiotemporally varying disturbance, the developed boundary control schemes achieve uniform boundedness of the steady state error between the boundary payload and the desired position. Simulations are provided to illustrate the applicability and effectiveness of the proposed control. Copyright © 2013 IFAC.

关键词： Ordinary differential equations

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Search for a Light Sterile Neutrino at Daya Bay

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Physical Review Letters 2014年第14期113卷 141802-141802页

作者： F. P. An A. B. Balantekin H. R. Band W. Beriguete M. Bishai S. Blyth I. Butorov G. F. Cao J. Cao Y. L. Chan J. F. Chang L. C. Chang Y. Chang C. Chasman H. Chen Q. Y. Chen S. M. Chen X. Chen Y. X. Chen Y. Chen Y. P. Cheng J. J. Cherwinka M. C. Chu J. P. Cummings J. de Arcos Z. Y. Deng Y. Y. Ding M. V. Diwan E. Draeger X. F. Du D. A. Dwyer W. R. Edwards S. R. Ely J. Y. Fu L. Q. Ge R. Gill M. Gonchar G. H. Gong H. Gong M. Grassi W. Q. Gu M. Y. Guan X. H. Guo R. W. Hackenburg G. H. Han S. Hans M. He K. M. Heeger Y. K. Heng P. Hinrichs Y. K. Hor Y. B. Hsiung B. Z. Hu L. M. Hu L. J. Hu T. Hu W. Hu E. C. Huang H. Huang X. T. Huang P. Huber G. Hussain Z. Isvan D. E. Jaffe P. Jaffke K. L. Jen S. Jetter X. P. Ji X. L. Ji H. J. Jiang J. B. Jiao R. A. Johnson L. Kang S. H. Kettell M. Kramer K. K. Kwan M. W. Kwok T. Kwok W. C. Lai K. Lau L. Lebanowski J. Lee R. T. Lei R. Leitner A. Leung J. K. C. Leung C. A. Lewis D. J. Li F. Li G. S. Li Q. J. Li W. D. Li X. N. Li X. Q. Li Y. F. Li Z. B. Li H. Liang C. J. Lin G. L. Lin P. Y. Lin S. K. Lin Y. C. Lin J. J. Ling J. M. Link L. Littenberg B. R. Littlejohn D. W. Liu H. Liu J. L. Liu J. C. Liu S. S. Liu Y. B. Liu C. Lu H. Q. Lu K. B. Luk Q. M. Ma X. Y. Ma X. B. Ma Y. Q. Ma K. T. McDonald M. C. McFarlane R. D. McKeown Y. Meng I. Mitchell J. Monari Kebwaro Y. Nakajima J. Napolitano D. Naumov E. Naumova I. Nemchenok H. Y. Ngai Z. Ning J. P. Ochoa-Ricoux A. Olshevski S. Patton V. Pec J. C. Peng L. E. Piilonen L. Pinsky C. S. J. Pun F. Z. Qi M. Qi X. Qian N. Raper B. Ren J. Ren R. Rosero B. Roskovec X. C. Ruan B. B. Shao H. Steiner G. X. Sun J. L. Sun Y. H. Tam X. Tang H. Themann K. V. Tsang R. H. M. Tsang C. E. Tull Y. C. Tung B. Viren V. Vorobel C. H. Wang L. S. Wang L. Y. Wang M. Wang N. Y. Wang R. G. Wang W. Wang W. W. Wang X. Wang Y. F. Wang Z. Wang Z. M. Wang D. M. Webber H. Y. Wei Y. D. Wei L. J. Wen K. Whisnant C. G. White L. Whitehead T. Wise H. L. H. Wong S. C. F. Wong E. Worcester Q. Wu D. M. Xia J. K. Xia X. Xia Z. Z. Xing J. Y. Xu J. L. Xu J. Xu Y. Xu T. Xue J. Yan C. C. Yan Institute of Modern Physics East China University of Science and Technology Shanghai University of Wisconsin Madison Wisconsin USA Brookhaven National Laboratory Upton New York USA Department of Physics National Taiwan University Taipei Joint Institute for Nuclear Research Dubna Moscow Region Institute of High Energy Physics Beijing Chinese University of Hong Kong Hong Kong Institute of Physics National Chiao-Tung University Hsinchu National United University Miao-Li Shandong University Jinan Department of Engineering Physics Tsinghua University Beijing North China Electric Power University Beijing Shenzhen University Shenzhen Siena College Loudonville New York USA Department of Physics Illinois Institute of Technology Chicago Illinois USA Lawrence Berkeley National Laboratory Berkeley California USA Department of Physics University of Illinois at Urbana-Champaign Urbana Illinois USA Chengdu University of Technology Chengdu Shanghai Jiao Tong University Shanghai Beijing Normal University Beijing College of William and Mary Williamsburg Virginia USA Department of Physics Yale University New Haven Connecticut USA Center for Neutrino Physics Virginia Tech Blacksburg Virginia USA China Institute of Atomic Energy Beijing School of Physics Nankai University Tianjin Department of Physics University of Cincinnati Cincinnati Ohio USA Dongguan University of Technology Dongguan Department of Physics University of California Berkeley California USA Department of Physics The University of Hong Kong Pokfulam Hong Kong Department of Physics University of Houston Houston Texas USA Charles University Faculty of Mathematics and Physics Prague University of Science and Technology of China Hefei Sun Yat-Sen (Zhongshan) University Guangzhou Joseph Henry Laboratories Princeton University Princeton New Jersey USA California Institute of Technology Pasadena California USA Xi’an Jiaotong University Xi’an Department of Physics College of Science and Technolo

A search for light sterile neutrino mixing was performed with the first 217 days of data from the Daya Bay Reactor Antineutrino Experiment. The experiment’s unique configuration of multiple baselines from six 2.9 GWth nuclear reactors to six antineutrino detectors deployed in two near (effective baselines 512 m and 561 m) and one far (1579 m) underground experimental halls makes it possible to test for oscillations to a fourth (sterile) neutrino in the 10−3 eV2<|Δm412|<0.3 eV2 range. The relative spectral distortion due to the disappearance of electron antineutrinos was found to be consistent with that of the three-flavor oscillation model. The derived limits on sin22θ14 cover the 10−3 eV2≲|Δm412|≲0.1 eV2 region, which was largely unexplored.

关键词： STERILE neutrinos OSCILLATIONS QUANTUM mechanics HYPOTHETICAL particles

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Pixel-level image fusion algorithm based on maximum likelihood and laplacian pyramid transformation

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Journal of Computational Information Systems 2013年第1期9卷 327-334页

作者： Tan, Hang Huang, Xianhe Tan, Huachun He, Changtao College of Automation Engineering University of Electronic Science and Technology of China Chengdu 610054 China School of Mechanical and Vehicular Engineering Beijing Institute of Technology Beijing 100081 China College of Electronic Engineering University of Electronic Science and Technology of China Chengdu 610054 China

In this paper, we proposed a novel pixel-level image fusion approach based on maximum likelihood and Laplacian pyramid decomposition. The input images are decomposed by using the Laplacian pyramid transformation at first, then the maximum likelihood method is used to fuse the image components in the low frequency bands. The selection strategy in fusing the high frequent band involving the entropy metrics theory. The final fused image can be obtained by using the inverse reconstruction of Laplacian pyramid transformation. Experimental result show that the proposed method outperforms conventional fusion methods such as discrete wavelet transform(DWT), Laplacian pyramid decomposition method, and so on. © 2013 Binary Information Press.

关键词： Image fusion

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Theoretical investigation of total-asymmetric simple exclusion processes with attachment and detachment

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Chinese Physics B 2012年第2期21卷 218-223页

作者： Xiao Song Liu Ming-Zhe Shang Jing Wang Hua Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059China

In this paper, traffic systems with attachment and detachment have been studied by total-asymmetric simple exclusion processes （TASEPs）. Attachment and detachment in a one-dimensional system is a type of complex geometry that is relevant to biological transport with the random update rule. The analytical results are presented and have shown good agreement with the extensive Monte Carlo computer simulations.

关键词： total-asymmetric simple exclusion process attachment and detachment mean-field approach Monte Carlo simulations

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An Experimental Study on Alpha Measurement with Two Radioactive Sources Inside Contaminated Steel Pipes

An Experimental Study on Alpha Measurement with Two Radioact...

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7th International Symposium on Radiation Safety and Detection technology(第七届国际声辐射安全与检测技术研讨会)(ISORD-7)

作者： Xianguo TUO Mingzhe LIU Jianbo YANG Lei WANG Yi CHENG Hui ZHAO Southwest University of Science and Technology Mianyang 621010 China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059 China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China

This paper investigates the effect of two radioactive sources (241Am and 239pu) inside contaminated pipes on alpha electric current values using a kind of nondestructive long-range alpha detection (LRAD) technique.

关键词： Nondestructive testing long-range alpha detection instrument radioactive source

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Analysis and improvement of the mass sensitivity for piezoelectric immunosensor

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2013 International Conference on applied Mechanics, Materials, and Manufacturing, AMMM 2013

作者： Chen, Yan Huang, Xian-He Shi, Hua-Shan Chen, Hong School of Automation Engineering University of Electronic Science and Technology of China Chengdu China State Key Laboratory of Biotherapy and Cancer Center West China Hospital West China Clinical Medicine School Sichuan University Chengdu China Guangan Vocational and Technical College Guangan China

ISBN: (纸本)9783037857953

The objective of this study was to improve the low repeatability in quartz crystal microbalance (QCM) measurements. The constitutive equations for the thickness-shear vibrations of an AT-cut quartz crystal with surface electrodes were used to obtain the particle vibration displacement amplitude equation. Then the mass sensitivity of piezoelectric immunosensor was analyzed and the approach to improve low repeatability was proposed. A 10MHz modified-electrode AT-cut QCM with a maximum mass sensitivity of 1.2×1011Hz / Kg was designed to verify uniform mass sensitivity distribution in the fully electrode region. Analysis results show that in order to improve the accuracy in QCM immunosensor measurements, it is feasible to improve its mass sensitivity. © (2013) Trans Tech Publications, Switzerland.

关键词： Quartz crystal microbalances

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