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Sustainable Power and Energy Conference (iSPEC)

作者： Jinxin Wang Peng Renyong Kailei Dai Zhiqiang Zhang Ting Zhang Junjie Zhao Qian Chen Jianjian Zhang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China Nuclear Power Institute of China Chengdu China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

The integrated charging system of Electric vehicle consists of a single-phase PWM rectifier and a Buck converter. When the single-phase PWM rectifier works with unit power factor, the dc-link voltage contains a large voltage harmonic of twice the grid frequency. Although the output voltage ripple can be controlled within the required range using the proper control of the Buck converter, the second-order harmonic on the dc-link capacitor is inevitable. This paper proposes a de-side decoupling method for the second-order harmonic problem of the dc-link voltage of the integrated charging system. A de-side decoupling half bridge is connected in parallel to absorb the ripple power of twice the grid frequency. This paper analyzes the operating principle of the de-side decoupling half bridge. Based on a theoretical analysis of the topology and the design procedure for controlling system, the proposed converter is designed and simulated. Finally, simulation results are given to verify the method.

关键词： Capacitors Rectifiers Bridge circuits Pulse width modulation Harmonic analysis Control systems Voltage control

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Flexible, Multi-Shank Stacked Array for High-Density Omini-Directional Intracortical Recording

Flexible, Multi-Shank Stacked Array for High-Density Omini-D...

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IEEE International Conference on Micro Electro Mechanical systems

作者： Zhejun Guo Longchun Wang Bowen Ji Ye Xi Bin Yang Jingquan Liu National Key Laboratory of Science and Technology on Micro/Nano Fabrication Shanghai Jiao Tong University China Unmanned System Research Institute Northwestern Polytechnical University Xi'an China

ISBN: (数字)9781665419123

ISBN: (纸本)9781665430241

This paper presents a flexible multi-shanks omini-directional neural probe array. The flexible probe includes eight shanks with different length, each shank contains 128 recording sites. Traditional Multilayer lithography is applied to fabricate the probe and a novel stacked structure is design with four-sided electrodes (32 sites on surface and 96 sites on sidewall) is proposed in this multi-shank array, which increases the electrode density of integration and the stacked structure can be readily scaled up to 1024 channels. It has been proved that the impedance at 1 kHz of the electrodes on the surface and the sidewalls are 830 kΩ and 1.1 MΩ in vitro respectively. With such design, longer life span can be achieved and the probe can capture richer neural signal. In addition, a method of microwire assisted implantation is proposed to ensure successful implantation in agar model.

关键词： Electrodes Micromechanical devices Surface impedance Reliability Impedance Probes In vitro

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Copula method of the kinematic accuracy of cylindrical roller bearing

Research Square

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Research Square 2021年

作者： Li, Lihong Xue, Yujun Li, Jishun Vehicles & Transportation Engineering Institute Henan University of Science and Technology Luoyang471003 China Henan Key Laboratory for Machinery Design and Transmission System Henan University of Science and Technology Luoyang471003 China State Key Laboratory of Aviation Precision Bearings Luoyang LYC Bearings Co. Ltd. Luoyang471039 China

The kinematic accuracy of cylindrical rollers bearing isn’t only influenced by the dimensional and form precision of its parts, but also more influenced by the cooperation among them. For cylindrical rollers bearing, the main indices of the kinematic accuracy are the ending beat and the radial run out of bearings. There must be dependent relationship between the cooperative action among the parts of bearings and the ending beat or the radial run out of bearings. This relationship is hardly expressed by mathematical formula. However, because the parts dimension deviation and the run out of bearings follow statistic law and have their distribution characteristics, while the copula joint distribution function can connect the run out of bearings with multiple parts dimension accuracy, the copula function is introduced to analyze the dependent relationship between bearing parts cooperative action and its kinematic accuracy. Based on the copula function of statistic theory, the kinematic accuracy of bearings can be forecast by parts geometric accuracy. © 2021, CC BY.

关键词： Kinematics

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Effect of variable stroke on combustion characteristics and stability of a free-piston engine generator

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Applied Thermal Engineering 2025年 277卷

作者： Liu, Chang Jia, Boru Liu, Zhen Zhang, Zhiyuan Hu, Xiaoxu Wei, Shuojian Ma, Yuguo School of Mechanical Engineering Beijing Institute of Technology Beijing 100081 China Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle Hubei University of Arts and Science Xiangyang 441053 China

The free-piston engine generator (FPEG) features a variable stroke structure, offering significant advantages in multi-fuel adaptability and high-efficiency combustion technologies. Stroke control and design directly affect combustion regulation and system performance, and thus represent a key challenge in FPEG development. Existing studies on stroke variation mostly rely on numerical simulations, often neglecting fuel short-circuit losses and lacking experimental validation of actual combustion performance and stability. In this study, an experimental approach was employed to investigate the effects of stroke length variation (47–55 mm) on the combustion characteristics, system performance, and operational stability of an FPEG. The results show that shortening the stroke reduced the indicated work by 4.3 % from 55 mm to 47 mm, but increased the operating frequency by 14.7 %, resulting in a 10 % improvement in indicated power. Moreover, shorter stroke lengths enhanced both indicated thermal efficiency and fuel economy, with the indicated thermal efficiency increasing by 19.6 % and the minimum ISFC reaching 336 g/(kW·h). In terms of stability, the short-stroke configuration markedly reduced cycle-to-cycle variations in both combustion and system operation: COVPmax and COVIMEP decreased by 34.5 % and 50.6 %, respectively, while COVf dropped to 0.59 %.This study is the first to experimentally reveal the influence of stroke variation on FPEG performance, providing valuable data support for structural optimization and performance control of FPEG systems.

关键词： Combustion characteristics Engine performance Free-piston engine generator Stability Variable stroke

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Abnormal flow of α particles in heavy-ion collisions at intermediate energies

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Physical Review C 2021年第4期103卷 044607-044607页

作者： G. Qu (曲国峰) Y. Huang (黄宇) D. Peng (彭丹) Z. Xu (徐子虚) W. Lin (林炜平) H. Zheng (郑华) G. Tian (田国玉) R. Han (韩瑞) C. Ma (马春旺) M. Huang (黄美容) P. Ren (任培培) J. Han (韩纪锋 ) Z. Yang (杨振雷) X. Liu (刘星泉) R. Wada Key Laboratory of Radiation Physics and Technology of the Ministry of Education Institute of Nuclear Science and Technology Sichuan University Chengdu 610064China School of Physics Henan Normal University Xinxiang 453007 China School of Physics and Information Technology Shaanxi Normal University Xi'an 710119 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China College of Physics and Electronics information Inner Mongolia University for Nationalities Tongliao 028000 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu 610213 China Cyclotron Institute Texas A&M University College Station Texas 77843 USA

The experimentally observed abnormal α flow behavior from heavy-ion collisions at intermediate energies is investigated using the events of Ca40+Ca40 at 35 MeV/nucleon simulated with an improved antisymmetrized molecular dynamics model with specific consideration of the Fermi motion in the nucleon-nucleon collision process. Its possible origins in the processes from the fragment formation to the experimental flow extraction, i.e., dynamical process, sequential decay, experimental detection, and data analysis, are closely examined. It is found that the observed abnormal α flow behavior originates from the reconstruction of reaction planes in the flow extraction. How the abnormal α flow behavior is generated from the reaction plane reconstruction procedure is discussed.

关键词： Collective flow Low & intermediate energy heavy-ion reactions Models & methods for nuclear reactions

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Beyond biochemical patterning: How mechanical bistability governs robust organoid morphogenesis

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Mechanobiology in medicine 2025年第2期3卷 100134页

作者： Qigan Gao Yuehua Yang Haoxiang Yang Hongyuan Jiang CAS Key Laboratory of Mechanical Behavior and Design of Materials CAS Center for Excellence in Complex System Mechanics Department of Modern Mechanics University of Science and Technology of China Hefei Anhui 230026 China.

Understanding the regulatory mechanisms of intestinal organoid morphogenesis remains a fundamental challenge in organoid biology. Emerging evidence highlights mechanical bistability as a critical regulator, mediated by dynamic lumen-actomyosin feedback. The recently developed 3D vertex model demonstrates that crypt curvature modulates actomyosin localization via mechanosensitive pathways, creating two stable morphological states-bulged or budded-depending on mechanical history. This model advances beyond static vertex models by incorporating epithelial thickness variations and lumen pressure effects, explaining previously unresolved phenomena like irreversible crypt budding and snap-through transitions. The findings establish a new framework for understanding mechanical decision-making in epithelial tissues, with implications for organoid engineering and developmental biology.

关键词： Epithelial mechanics Intestinal organoids Mechanical bistability Morphogenesis Vertex model

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The bending vibration characteristics of the hull grillage structure based on back propagation neural network

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Ocean Engineering 2025年 337卷

作者： Dongyan Shi Liang Yan Xiaofan Zhuang Qinlin Xie College of Mechanical and Electrical Engineering Harbin Engineering University Harbin 150001 People's Republic of China China Ship Design & Research Center Co. Ltd Qingdao 266520 People's Republic of China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chendu 610041 People's Republic of China

This study investigates the longitudinal bending vibration characteristics of hull grillage structures through a synergistic approach integrating wave propagation methodology and back propagation neural network. The spring oscillator coupled beam system is established as the equivalent physical model to represent the low-frequency bending vibration behaviour of the grillage structure. The governing equations for this coupled beam system with elastic boundary conditions are systematically derived using the wave propagation approach. Subsequently, the back propagation neural network is developed to predict the natural frequencies of longitudinal bending vibrations, effectively circumventing the requirement for constructing finite element models during preliminary frequency analysis. The bending vibration of the grillage structure is conducted using the proposed equivalent model, with validation performed through comparative analysis with finite element simulations and model experiments. The research further explores the effects of structural parameters on longitudinal bending vibration characteristics. The neural network-based prediction methodology demonstrates significant advantages in rapidly estimating natural frequencies. This integrated approach provides an efficient alternative for preliminary vibration assessment of grillage structures, demonstrating both theoretical validity and practical applicability through comprehensive validation.

关键词：

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Characterization of molten 2LiF–BeF_2 salt impregnated into graphite matrix of fuel elements for thorium molten salt reactor

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Nuclear science and Techniques 2019年第5期30卷 32-39页

作者： Hong-Xia Xu Jun Lin Ya-Juan Zhong Zhi-Yong Zhu Yu Chen Jian-Dang Liu Bang-Jiao Ye Center for Thorium Molten Salt Reactor System Shanghai Institute of Applied PhysicsChinese Academy of Sciences State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China USTC

The impregnation behavior of molten 2LiF–BeF_2(FLiBe) salt into a graphite matrix of fuel elements for a solid fuel thorium molten salt reactor(TMSR-SF) at pressures varying from 0.4 to 1.0 MPa was studied by mercury intrusion, molten salt impregnation, X-ray diffraction, and scanning electron microscopy *** was found that the entrance pore diameter of the graphite matrix is less than 1.0 μm and the contact angle is about 135°. The threshold impregnation pressure was found to be around 0.6 MPa experimentally, consistent with the predicted value of 0.57 MPa by the Washburn equation. With the increase of pressure from 0.6 to 1.0 MPa, the average weight gain of the matrix increased from 3.05 to 10.48%,corresponding to an impregnation volume increase from 2.74 to 9.40%. The diffraction patterns of FLiBe are found in matrices with high impregnation pressures(0.8 MPa and1.0 MPa). The FLiBe with sizes varying from tens of nanometers to a micrometer mainly occupies the open pores in the graphite matrix. The graphite matrix could inhibit the impregnation of the molten salt in the TMSR-SF with a maximum operation pressure of less than 0.5 MPa.

关键词： keywords Molten salt reactor FLiBe Impregnation Graphite matrix

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Drift-Flux Correlation Based on Coaxial Line Phase Sensor in a Horizontal Slug Flow

SSRN

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SSRN 2022年

作者： Zhao, Zhiyue Wang, Xiaojie Wang, Fan Li, Xiaoting Fang, Lide Zhao, Ning The College of Physics Science and Technology Hebei University Baoding071002 China College of Quality and Technical Supervision Hebei University National & Local Joint Engineering Research Center of Metrology Instrument and System Hebei Key Laboratory of Energy Metering and Safety Testing Technology Baoding071002 China College of Mechanical and Electrical Engineering Cangzhou Normal University Cangzhou061001 China

Void fraction is a crucial parameter in pressure drops calculation, heat transfer industrial process design in the two-phase flow, the drift-flow correlation is often been applied in the void fraction predicted of gas-liquid two-phase due to its rate has the advantageous characteristics of simple structure and high practicality. The void fraction measurement experiments of slug flow have been conducted using a coaxial line phase sensor, and the prediction performance of available correlations has been assessed and analyzed comprehensively using current and database obtained. After the systematic analysis of the influence effecting on the distribution parameter C0 and drift velocity ugm, the functional between C0 and L-M parameter X is established, and mass quality ratio between liquid and gas (1-x)/x and superficial velocity um are selected as variables to develop prediction models for ugm. The optimized correlation can dynamically reflect the effects of gas-liquid flow velocity and system pressure variation on C0 and ugm, and the predictive performance of present correlation evaluated by the mean absolute percentage error (MAPE) is 6.98% and 11.07% in current and literature data, respectively. © 2022, The Authors. All rights reserved.

关键词： Void fraction

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Ray-Tracking Simulation and Analysis of Propagation for Typical Scene of High Speed Maglev

Ray-Tracking Simulation and Analysis of Propagation for Typi...

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International Conference on Communication technology (ICCT)

作者： Chen Kewei Liu Hongbo Liang Jiaqi Liu Qintao College of Electronic Engineering Naval University of Engineering Wuhan China National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781665432078

The propagation of 38 GHz and 3.5 GHz in typical scenarios of high-speed maglev train is studied. Referring to the magnetic field configuration of Shanghai Maglev, the viaduct and tunnel scenes are modeled and simulated. The propagation characteristics at 38GHz and 3.5GHz are compared in terms of receiving power and Doppler frequency shift, and the broadband path loss and delay spectrum parameters are modeled, which provides suggestions for the design of high-speed data transmission communication system.

关键词： Reflectivity Doppler shift Magnetic levitation vehicles Scattering Propagation losses Data models Magnetic analysis

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