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8th International Conference on Engineering and Innovative Materials, ICEIM 2019

作者： Zhou, Nan Wang, Jinxiang Tong, Zongbao Tang, Songze Department of Criminal Science and Technology Nanjing Forest Police College Nanjing210023 China National Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing210094 China Jiangnan Industries Group Co. LTD Xiangtan411207 China

ISBN: (纸本)9783035716054

In order to study the penetration performance of the tandem warhead composed of a front circular shaped charge and a rear penetration projectile, a grooved steel plate was processed to simulate the effect of circular shaped jets on metal plate, then the failure mechanism of the grooved steel plate impacted by rear projectile was investigated by ballistic experiment, meanwhile, the effect of projectile nose shape on the failure mechanism was also analyzed. The results show that the main failure mechanism of grooved steel plate is ductile tensile deformation or damage when the projectile impacted on the inner plate body and the depth of the pre-splitting groove is not big enough (usually more than 4mm), on the other hand, the circumferential sheared fracture of the bottom of the groove occurred when the depth of the pre-splitting groove is not less than 4mm. The oval projectile body has much greater erosion damage than rod-shaped projectile during the penetration process. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Projectiles

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On-chip generation and characterization of densely-spaced time-bin entangled qubits

On-chip generation and characterization of densely-spaced ti...

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Signal Processing in Photonic Communications, SPPCom 2021 - Part of OSA Advanced Photonics Congress 2021

作者： Yu, Hao Chemnitz, Mario Sciara, Stefania Fischer, Bennet Crockett, Benjamin Roztocki, Piotr Little, Brent E. Chu, Sai T. Moss, David J. Azaña, José Wang, Zhiming Morandotti, Roberto VarennesJ3X 1S2 Canada Institute of Fundamental and Frontier Sciences University of Science and Technology of China Chengdu610054 China State Key Laboratory of Transient Optics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Science Xi'an China Department of Physics City University of Hong Kong Hong Kong Optical Sciences Centre Swinburne University of Technology HawthornVIC3122 Australia

By using an on-chip unbalanced interferometer for densely-spaced time-bin state preparation/processing and a spiral waveguide for photon-pair generation, we demonstrate and implement high-quality densely-spaced time-e...

ISBN: (纸本)9781557528209

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Influences of the Lorentz Force on the Detonation Propagation in a Tube

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SSRN 2025年

作者： Wang, Yuhan Chen, Zhihua Zhang, Huanhao Zheng, Chun National Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing210094 China National Graduate College for Engineers Southern University of Science and Technology Shenzhen518055 China School of Energy and Power Engineering Nanjing University of Science and Technology Nanjing210094 China

The present work aims to investigate the effects of the electromagnetic field on detonation propagation in a tube. The reactive Euler equations are developed with the addition of Lorentz force as the source terms and are solved with the combination of hybrid Roe/HLL scheme and the Adaptive Mesh Refinement technique. The numerical results indicate that the propagation velocity of the detonation wave is reduced with the opposite Lorentz forces, and the reduced magnitude depends only on the force magnitude. The detonation cellular structures disappear also with the applied forces. The wave shape is almost the same shape as the applied Lorentz force. Furthermore, the strong shock waves induced by the force directly ignite the hot spots and make the detonation self-sustained. © 2025, The Authors. All rights reserved.

关键词： Euler equations

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Mechanism of Electromagnetic Flow Control Enhanced by Electro-Discharge in Water

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Chinese physics Letters 2018年第5期35卷 73-77页

作者： Yan-Liang Ji Ben-Mou Zhou Ya-Dong Huang Science and Technology on Transient Physics Laboratory Nanjing University of Science and Technology

Pulsed discharge utilized to achieve large current density in the electromagnetic flow control is numerically studied. A mathematic discharge model is established to calculate the plasma channel, and an actuator is designed to generate the Lorentz force in the micro plasma channel. During the discharge process, the resistance in the channel decreases rapidly and a large current density appears between the discharge electrodes. After the actuator is applied in the leading edge of a flat plate, the separation region and downstream turbulent boundary layer on the plate disappear. Meanwhile, a skin-friction drag force reduction is achieved.

关键词： Mechanism of Electromagnetic Flow Control Enhanced by Electro-Discharge in Water

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Emergence of Laser Cavity-Solitons in a Microresonator-Filtered Fiber Laser

Emergence of Laser Cavity-Solitons in a Microresonator-Filte...

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2021 Conference on Lasers and Electro-Optics, CLEO 2021

作者： Rowley, Maxwell Henry Hanzard, Pierre Cutrona, Antonio Chu, Sai T. Little, Brent E. Morandotti, Roberto Moss, David J. Sebastian Totero Gongora, Juan Peccianti, Marco Pasquazi, Alessia Lab Dept. of Physics and Astronomy BN1 9QH United Kingdom City University of Hong Kong Department of Physics Hong Kong Hong Kong Xi'An Institute of Optics and Precision Mechanics CAS State Key Laboratory of Transient Optics and Photonics Xi'an China INRS-EMT VarennesQC Canada Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology Chengdu China Swinburne University of Technology Sciences Centre HawthornVIC3122 Australia

The parameter space, defined by simple global controls, is probed in a microresonator-filtered fiber laser. We identify a distinct region that clearly admits solitons and we investigate the role of slow nonlinearities... 详细信息

ISBN: (纸本)9781943580910

关键词： Microresonators

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Numerical investigation on the vertical water-entry of a hollow cylinder at low velocity 31

Numerical investigation on the vertical water-entry of a hol...

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31st International Symposium on Ballistics, BALLISTICS 2019

作者： Hou, Yu Huang, Zhen-Gui Chen, Zhi-Hua Guo, Ze-Qing Luo, Yu-Chuan National Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing210094 China

ISBN: (纸本)9781605956107

Based on the volume of fluid (VOF) multiphase flow equations,the k-e turbulent model and sliding mesh technique, the lowspeed vertical water-entry of a hollow cylinder was investigatednumerically. The numerical results have a good agreement withcorresponding experimental results and finer meshindependence. The results show that a jet flow induced by thethrough-hole provides a new connection between the inner andouter flow at the pinch-off time underwater. Furthermore, a littlebubble on the top of the through-hole jet is created by thecollision of the edge surface of the water column inside thecylinder. The initial water-entry speed has a significantinfluence on the inner cavity formation, the pinch-off depth, thethrough-hole jet ejection and the motion parameter during thevertical water-entry process. © 2019 by International Ballistics Society All rights reserved.

关键词： Multiphase flow

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Erratum: Approximate analytic solution of heat conduction in hollow semi-spheres flying at hypersonic speed International Communications in Heat and Mass Transfer, 2013, 43: 46–52

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International Communications in Heat and Mass Transfer 2021年 124卷 105281-105281页

作者： Han, Guilai Qi, Li Jiang, Zonglin State Key Laboratory of High Temperature Gas Dynamics Institute of Mechanics Chinese Academy of Sciences Beijing100190 China School of Engineering Science University of Chinese Academy of Sciences Beijing100049 China National Key Laboratory of Transient Physics Najing University of Science and Technology Nanjing210094 China

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Electrodynamic response study on railgun launcher based on electromechanical coupling model 31

Electrodynamic response study on railgun launcher based on e...

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31st International Symposium on Ballistics, BALLISTICS 2019

作者： Hongcheng Xiao, A. Dongmei Yin, B. Baoming Li, C. National Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing210094 China

ISBN: (纸本)9781605956107

The electrodynamic behavior of a medium caliber railgun launcher has been studiedbased on an electromechanical coupling model, which uses a unified modeling methodfor both electromagnetic and electromechanical field. This model adopts a materialequivalent method to simulating the sliding contact behavior during armature in *** embedded node encoding program during meshing operation provides good loadtransfer accuracy between electromagnetic field and mechanical field. Dynamicproperties of magnetic field are firstly simulated and a subsequent dynamic analysis isconducted by mapping element results from electromagnetic analysis step to structureanalysis step. The electromechanical-elastic response of the barrel is studied under thecurrent. The numerical model has shown reliability compared to experimental results. © 2019 by International Ballistics Society All rights reserved.

关键词： Electrodynamics

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Method of ballistic control and projectile rotation in a novel railgun

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Defence technology（防务技术） 2018年第5期14卷 628-634页

作者： Bo Tang Ying-tao Xu Gang Wan Jiang Yue Yong Jin Hai-yuan Li National Key Laboratory of Transient Physics Nanjing University of Science and Technology

In order to realize the ballistic control of the railgun and the flight stability of the projectile, a new type of railgun is designed, which can control the muzzle velocity and rotation rate. The method of the muzzle velocity and overload control is to adjust the voltage or other parameters of pulse power supply. It would be easy to change velocity accurately in large wide. Another widespread concern problem is launching the spinning stability projectile by railgun. This paper designed a new structure of additional rails to generate an unsymmetrical magnetic field to produce rotational torque in armature. The structure is simple and can control the rotation rate by linear changing the barrel parameters. The calculation formulas of interior ballistic are derived by Biot-Safar law. The important parameter is the deflection angle of the additional rails relative to the symmetry plane of main rail. The larger the angle, the greater the rotation torque generated in the armature. To maintain the flight stability of the projectile, the barrel structural parameters should be proportional to the projectile structural parameters. When changing the muzzle velocity, the rotation rate will also be the equal proportion change. So that the gyro stability is the same. The experiment proves that the railgun designed in this paper can launch the projectile to rotate. And the rotational projectile may not cause the transition or much arcs. This method expands the application of the railgun.

关键词： Ballistic control Railgun Rotation Spin-stabilized projectile

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Soliton microcombs in optical microresonators with perfect spectral envelopes

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Opto-Electronic Advances 2025年第3期 62-71页

作者： Mulong Liu Ziqi Wei Haotong Zhu Hongwei Wang Xiao Yu Xilin Han Wei Zhao Guangwei Hu Peng Xie School of Science Northwest A & F University School of physics Peking University Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences School of Electrical and Electronic Engineering Nanyang Technological University Qiguang Research and Innovation Center Aerospace Laser Technology and System DepartmentShanghai Institute of Optics and Fine MechanicsChinese Academy of Science State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics (XIOPM)Chinese Academy of Sciences (CAS)

We theoretically and experimentally investigate thermal dynamics involved soliton microcomb generation in silicon oxynitride microresonators. Importantly, auxiliary laser heat balance scheme with flexible thermal manipulation is introduced to circumvent thermal instability and the intra-cavity temperature can be tuned from 60 ℃ to 41.5 ℃ via the commercial thermoelectric controller. As a result, various perfect soliton states with ultra-smooth spectral envelopes are observed on a well-designed and fabricated microresonator with homogeneous sidewall and thickness where spatial modes interaction and distortion are eliminated. The pre-reported spectral abrupt jumps due to mode hybridization are completely avoided and solitons tail oscillation vanishes simultaneously. This reported ideal coherent comb source without residual temporal and spectral noise will facilitate practical applications such as spectroscopy, ranging and astrocomb calibration.

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