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Design and Analysis of a Wireless Power Transmission System with Magnetic Coupling Resonance in the Weak-coupling Region

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Chinese Journal of Electrical Engineering 2019年第4期5卷 51-60页

作者： Dawei Song Fengdong Shi Shuailong Dai lai liu School of Electrical Engineering and Automation Tianjin Polytechnic UniversityTianjin 300387China College of Electrical Engineering and New Energy China Three Gorges UniversityYichang 443002China

The magnetically coupled resonant wireless power transfer(MCR-WPT)system for implantable medical devices has gradually become one of the research *** transmission characteristics of the system in weak-coupling regions are of research *** mathematical model of the system's transmission characteristics is established by equivalent circuit *** key factors that affect the transmission characteristics of the system are obtained,to include the self-inductance of the coil,the mutual inductance between the coils,and the load resistance.A magnetically coupled resonant wireless power transfer system is designed.A method of coil design is *** transmission efficiency of the system in the weak-coupling region is improved by optimizing the design of the *** and experimental results exhibited good *** results show that the transmission performance of the system in the weak-coupling area is *** work provides guidance and practical significance for the research of the MCR-WPT system with implantable medical equipment.

关键词： Wireless power transfer frequency splitting weak-coupling region coil design

Effects of Crystal Orientations on the Low-Cycle Fatigue of a Single-Crystal Nickel-Based Superalloy at 980 °C

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Acta Metallurgica Sinica(English Letters) 2019年第3期32卷 381-390页

作者： liu liu Jie Meng Jin-lai liu Hai-Feng Zhang Xu-Dong Sun Yi-Zhou Zhou School of Materials Science and Engineering Northeastern University Superalloys Division Institute of Metal Research Chinese Academy of Sciences Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

The influence of crystal orientations on the low-cycle fatigue(LCF) behavior of a 3Re-bearing Ni-based single-crystal superalloy at 980 °C has been investigated. It is found that the orientation dependence of the fatigue life not only depends on the elastic modulus, but also the number of active slip planes and the plasticity of materials determine the LCF life,especially for the [011] and [111] specimens. The [011] and [111] specimens with better plasticity withstand relatively concentrated inelastic deformation caused by fewer active slip planes, compared to the [001] specimens resisting widespread deformation caused by a higher number of active slip planes. Additionally, fatigue fracture is also influenced by cyclic plastic deformation mechanisms of the alloy with crystal orientations, and the [001] specimens are plastically deformed by wave slip mechanism and fracture along the non-crystallographic plane, while the [011] and [111] specimens are plastically deformed by planar slip mechanism and fracture along the crystallographic planes. Moreover, casting pores,eutectics, inclusions and surface oxide layers not only initiate the crack, but also reduce the stress concentration around crack tips. Our results throw light upon the effect of inelastic strain on the LCF life and analyze the cyclic plastic deformation for the alloy with different orientations.

关键词： Single-crystal superalloy Low-cycle fatigue Anisotropy Fracture behavior

Geochronological and geochemical evidence for a Late Ordovician to Silurian arc-back-arc system in the northern Great Xing'an Range,NE China

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Geoscience Frontiers 2021年第1期12卷 131-145页

作者： Bo liu Jia-Fu Chen Bao-Fu Han Jun-lai liu Jia-Wei Li Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Department of GeologySchool of Resources and Civil EngineeringNortheastern UniversityShenyang 110819China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Natural ResourcesChangchun 130061China State Key Laboratory of Geological Process and Mineral Resources School of Earth Sciences and ResourcesChina University of GeosciencesBeijing 100083China Ministry of Education Key Laboratory of Orogenic Belts and Crustal EvolutionSchool of Earth and Space SciencesPeking UniversityBeijing 100871China

The early Paleozoic tectonic evolution of the Xing'an-Mongolian Orogenic Belt is dominated by two oceanic basins on the northwestern and southeastern sides of the Xing'an Block,i.e.,the Xinlin-Xiguitu Ocean and the Nenjiang ***,the early development of the Nenjiang Ocean remains ***,we present zircon U-Pb geochronology and whole-rock elemental and Sr-Nd isotopic data on the gabbros in the Xinglong area together with andesitic tuffs and basalts in the Duobaoshan ***-ICP-MS zircon U-Pb dating of gabbros and andesitic tuffs yielded crystallization ages of 443-436 Ma and 452-451 Ma,*** Early Silurian Xinglong gabbros show calc-alkaline and E-MORB affinities but they are enriched in LILEs,and depleted in HFSEs,with relatively low U/Th ratios of 0.18-0.36 andεNd(t)values of-1.6 to+*** geochemical features suggest that the gabbros might originate from a mantle wedge modified by pelagic sediment-derived melts,consistent with a back-arc basin *** contrast,the andesitic tuffs are characterized by high MgO(>5 wt.%),Cr(138-200 ppm),and Ni(65-110 ppm)contents,and can be termed as high-Mg *** low Sr/Y ratios of 15.98-17.15 and U/Th values of 0.24-0.25 and moderate(La/Sm)_n values of 3.07-3.26 are similar to those from the Setouchi Volcanic Belt(SW Japan),and are thought to be derived from partial melting of subducted sediments,and subsequent melt-mantle *** Duobaoshan basalts have high Nb(8.44-10.30 ppm)and TiO2 contents(1.17-1.60 wt.%),typical of Nb-enriched *** are slightly younger than regional adakitic rocks and have positiveεNd(t)values of+5.2 to+5.7 and are interpreted to be generated by partial melting of a depleted mantle source metasomatized by earlier adakitic *** with coeval arc-related igneous rocks from the southeastern Xing'an Block,we propose that the Duobaoshan high-Mg andesitic tuffs and Nbenriched basalts are parts of the Late Ordovician and Silurian Sonid Zuoqi-Duoba

关键词： Nenjiang ocean Arc-back-arc system Xing'an-Mongolian orogenic belt Gabbros Nb-enriched basalts

On proportional scintillation in very large liquid xenon detectors

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Nuclear Science and Techniques 2020年第9期31卷 90-97页

作者： Pratibha Juyal Karl-Ludwig Giboni Xiang-Dong Ji Jiang-lai liu School of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai Key Laboratory for Particle Physics and Cosmology(INPAC)800 Dongchuan RoadShanghai 200240China

The charge readout of a liquid xenon(LXe)detector via proportional scintillation in the liquid phase was first realized by the Waseda group 40 years ago,but the technical challenges involved were *** the tests were successful,this method was finally discarded and eventually nearly ***,this approach is not considered for large LXe dark matter ***,the dual-phase technology was selected despite many limitations and *** two independent studies,two groups from Columbia University and Shanghai Jiao Tong University reevaluated proportional scintillation in the liquid *** studies established the merits for very large LXe detectors,but the Columbia group also encountered apparent limitations,namely the shadowing of the light by the anode wires,and a dependence of the pulse shape on the drift path of the electrons in the anode *** differences between the two studies,however,are not intrinsic to the technique,but a direct consequence of the chosen *** the geometrical differences into account,the results match without *** also agree with the original results from the Waseda group.

关键词： Liquid detectors Time projection chambers(TPC) Multiplication and electroluminescence in rare gases and liquids

Event-triggered Control of Positive Switched Systems with Actuator Saturation and Time-delay

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International Journal of Automation and computing 2021年第1期18卷 141-154页

作者： Jun-Feng Zhang lai-You liu Shi-Zhou Fu Shuo Li School of Automation Hangzhou Dianzi UniversityHangzhou 310018China Inria University of LilleLille 59000France

This paper investigates the event-triggered control of positive switched systems with randomly occurring actuator saturation and time-delay,where the actuator saturation and time-delay obey different Bernoulli ***,an event-triggering con-dition is constructed based on a 1-norm *** the presented event-triggering scheme,an interval estimation method is utilized to deal with the error term of the *** a co-positive Lyapunov functional,the event-triggered controller and the cone attraction domain gain matrices are designed via matrix decomposition *** positivity and stability of the resulting closed-loop systems are reached by guaranteeing the positivity of the lower bound of the systems and the stability of the upper bound of the systems,*** proposed approach is developed for interval and polytopic uncertain systems,***,two examples are provided to illustrate the effectiveness of the theoretical findings.

关键词： Positive switched systems event-triggered control randomly occurring actuator saturation linear programming time-delay

Correlation Between Energy Transfer Rate and Atomization Energy of Some Trinitro Aromatic Explosive Molecules

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Chinese Journal of Chemical Physics 2008年第3期21卷 250-254页

作者： Su-hong Ge Xin-lu Cheng Zheng-lai liu Xiang-dong Yang Fang-fang Dong Department of Physics Hexi University Zhangye 734000 China Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China

An assumptive theoretical relationship is suggested to describe the property of molecular atomization energy and energy transfer rate in the initiation of explosions. To investigate the relationship between atomization energy and energy transfer rate, the number of doorway modes of explosives is estimated by the theory of Dlott and Fayer in which the rate is proportional to the number of normal mode vibrations. It was evaluated frequencies of normal mode vibrations of eight molecules by means of density functional theory （DFT） at the b3p86/6-31G（d,p） level. It is found that the number of doorway modes shows a linear correlation to the atomization energies of the molecules, which were also calculated by means of the same method. A mechanism of this correlation is discussed. It is also noted that in those explosives with similar molecular structure and molecular weight, the correlation between the atomization energy and the number of doorway modes is higher.

关键词： Secondary explosive Atomization energy Normal mode vibration Doorway region

Study of electromagnetic characteristics of stress distribution and sudden changes in the mining of gob-surrounded coal face

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Journal of China University of Mining and Technology 2008年第1期18卷 1-5页

作者： WANG En-yuan liu Xiao-fei ZHAO En-lai liu Zhen-tang School of Mining and Safety Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

The incidence of dynamic coal or rock disasters is closely related to the distribution of stress in the surrounding rock. Our experiments show that electromagnetic radiation （EMR） signals are related to the state of stress of a coal body. The higher the stress, the more intense the deformation and fractures of a coal body and the stronger the EMR signals. EMR signals reflect the degrees of concentrated stress of a coal body and danger of a rock burst. We selected EMR intensity as the test index of the No.237 gob-surrounded coal face in the Nanshan coal mine. We tested the EMR characteristics of the stress distribution on the strike, on the incline and in the interior of the coal body. The EMR rule of rock bursts, caused by sudden changes in stress, is analyzed. Our research shows that EMR technology can be not only used to test qualitatively the stress distribution of the surrounding rock, but also to predict a possible occurrence of rock burst. Based on this, effective distress measures are used to eliminate or at least weaken the incidence of rock bursts. We hooe that safetv in coalmines will be enhanced.

关键词： gob-surrounded coal face stress distribution sudden stress change rock burst electromagnetic radiation (EMR)

Effect of Orientation on Stress-Rupture Property and Related Deformation Microstructure of a Ni-Base Re-containing Single-Crystal Superalloy at 900℃

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Acta Metallurgica Sinica(English Letters) 2021年第5期34卷 719-728页

作者： Guang-Lei Wang Jin-lai liu Ji-De liu Yi-Zhou Zhou Xu-Dong Sun Hai-Feng Zhang Xiao-Feng Sun School of Materials Science and Engineering Northeastern UniversityShenyang110004China Institute of Metal Research Chinese Academy of SciencesShenyang110016China

Stress-rupture properties of a Ni-base Re-containing single-crystal superalloy with three orientations have been tested under 900℃/445 *** obvious anisotropy of stress-rupture property is attributed to orientation reliant deformation *** good strength in[001]orientation is attributed to the rapid multiplication of dislocations active in horizontal channels and laterγ'cutting via dislocations pair coupled with anti-phase *** microtwin formation largely limits the strength and plasticity as a result of the continuous shearing acrossγ/γ'microstructure by{111}112 slip activated in[011]*** property in[111]orientation results mainly from the lateral cross-slip movements of the screw dislocations within connected matrix channels as well as the precipitate shearing by coplanar *** all initially originate from the interdendritic micropores in three *** critical temperature of stress-rupture anisotropy could be increased by a high level of refractory solutes especially Re.

关键词： Nickel-base superalloy Stress-rupture property Orientation effec Deformation microstructure Fracture behavior

Ultrasonic positioning system for the calibration of central detector

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Nuclear Science and Techniques 2019年第1期30卷 27-33页

作者： Guo-Lei Zhu Jiang-lai liu Qi Wang Meng-Jiao Xiao Tao Zhang School of Marine Science and Technology Northwestern Polytechnical University Shanghai Laboratory for Particle Physics and Cosmology INPAC and School of Physics and Astronomy Shanghai Jiao Tong University Department of Physics University of Maryland Center of High Energy Physics Peking University

A thorough detector response calibration using radioactive sources is necessary for the Jiangmen Underground Neutrino Observatory. Herein, we discuss the design of a source positioning system based on ultrasonic technology, aiming for a 3-cm precision over the entire35-m diameter detector sphere. A prototype system is constructed and demonstrated for the experiment.

关键词： JUNO Calibration Ultrasonic positioning