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SSRN 2023年

作者： Zu, Wei Ying, Zhanfeng Shi, Tingchuan Lin, Jiaxue Zhao, Jian National Key Laboratory of Transient Physics Nanjing University of Science and Technology Xiaolingwei Nanjing200 China School of Energy and Power Engineering Nanjing University of Science and Technology Xiaolingwei Nanjing200 China

With the development of thermoelectric energy harvesting technology, performance evaluation of thermoe-lectric generator (TEG) module has an important significance for the reliability improvement and optimization design of thermoelectric energy harvesting system. In this paper, an electrical analogy model for performance evaluation of TEG modules is proposed considering nonlinear characteristics of natural and forced convection conditions. An identification method based on the multi-objective optimization and the NSGA-II algorithm is presented to determine the model parameters which are difficult to calculate in theo-ry. An experimental platform is designed to validate the effectiveness and advantages of the proposed method. The experimental results show that the proposed model is more accurate than the traditional model in evaluating the output performance of TEG module under natural and forced convection. © 2023, The Authors. All rights reserved.

关键词： Forced convection

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Optical vortex in a quasicrystal structure

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Optics Letters 2025年第10期50卷 3373-3376页

作者： Li, Chenying Qin, Xueyun Liu, Kun Zhang, Hao Zhou, Yujie Tai, Yuping Li, Xinzhong School of Physics and Engineering School of Chemistry and Chemical Engineering Henan University of Science and Technology Luoyang471023 China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision Mechanics Chinese Academy of Sciences Xi’an710119 China

Analagous to the quasicrystal in solid physics, we reveal the properties of optical vortex (OV) in a photonic quasicrystal structure via interfering plane waves. The distribution of OVs possesses the rotational symmetry and the symmetric order agrees with the number of the plane waves. The OVs exhibit a long-range order along the radial directions. Further, the distribution and the signs of the topological charges (TCs) of OVs can be modulated via adjusting the initial phase difference between adjacent waves. In addition, the TCs are multiplied, and the orbital angular momentum and energy flow have been modulated and analyzed. This study opens up a novel, to the best of our knowledge, horizon for versatile OVs’ distribution, which will prompt several advanced applications such as multiple particle manipulation and quantum transport. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Quasicrystals

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Improved Internal Ballistics Model of High and Low Pressure Chamber Launch for Recoil Problem of Ultralight Guns

SSRN

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SSRN 2023年

作者： Kong, L.Q. Wang, J.X. Song, H.P. Tang, K. Chen, R.M. Li, Y.B. Gong, H.X. Cai, S.Y. National Key Laboratory of Transient Physics Nanjing University of Science and Technology Jiangsu Nanjing210094 China China North Vehicle Research Institute Beijing100072 China

Light gun is of unique application prospect for its low body mass and projectile initial velocity. In order to solve the problem of calculation error caused by the large free recoil velocity of light artillery in traditional interior ballistic model, a suitable internal ballistic model for ultralight artillery is proposed through the design and test of a light gun, the accuracy of the algorithm is verified. At the same time, the extended calculation is carried out to analyze the impact of the buffer device on the interior ballistic performance. The result shows that the lighter the gun, the greater the improvement brought by the buffer device under the same mass and recoil resistance. When the mass of the projectile and the gun is both 3kg, the resistance of 70kN can increase the velocity of projectile by 16.2%. Furthermore, the internal ballistic elements of the traditional algorithm and the improved algorithm are calculated respectively under the same working conditions. It is found that when the mass of the gun is 8.567 times the mass of the bullet, the error of the two algorithms is less than 1%, and the error increases gradually with the mass ratio of gun and projectile decreasing. © 2023, The Authors. All rights reserved.

关键词： Projectiles

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Rapid and precise distance measurement with hybrid comb lasers

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Advanced Photonics Nexus 2024年第4期3卷 70-81页

作者： Zhichuang Wang Jiawen Zhi Hanzhong Wu Brent E.Little Sai T.Chu Jie Zhang Zehuang Lu Chenggang Shao Weiqiang Wang Wenfu Zhang Chinese Academy of Sciences Xi’an Institute of Optics and Precision MechanicsState Key Laboratory of Transient Optics and PhotonicsXi’anChina University of Chinese Academy of Sciences BeijingChina Huazhong University of Science and Technology PGMF and School of PhysicsMOE Key Laboratory of Fundamental Physical Quantities MeasurementsHubei Key Laboratory of Gravitation and Quantum PhysicsWuhanChina City University of Hong Kong Department of Physics and Materials ScienceHong KongChina

Dual-comb ranging allows rapid and precise distance measurement and can be universally implemented on different comb platforms,e.g.,fiber combs and *** date,dual-fiber-comb ranging has become a mature and powerful tool for metrology and industry,but the measurement speed is often at a kilohertz level due to the lower repetition ***,dual-microcomb ranging has given rise to a new opportunity for distance measurement,in consequence of its small footprint and high repetition rates,but full-comb stabilization is ***,we report a dual-hybrid-comb distance meter capable of ultrarapid and submicrometer precision distance measurement,which can not only leverage the advantage of easy locking inherited from the fiber comb but also sustain ultrarapid measurement speed due to the *** experimental results show that the measurement precision can reach 3.572μm at 4.136μs and 432 nm at 827.2μs averaging *** from the large difference between the repetition rates of the hybrid combs,the measurement speed can be enhanced by 196 folds,in contrast to the dual-fiber-comb system with about a 250 MHz repetition *** work can offer a solution for the fields of rapid dimensional measurement and spectroscopy.

关键词： microcomb absolute distance measurement high-precision measurement high-speed measurement

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Model for ice–ship interaction based on an improved peridynamics 31st

Model for ice–ship interaction based on an improved peridyn...

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31st International Ocean and Polar Engineering Conference, ISOPE 2021

作者： Zhang, Yuan Wang, Chao Ye, Liyu Sun, Shuai College of Shipbuilding Engineering Harbin Engineering University Harbin Heilongjiang China National Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing China

ISBN: (纸本)9781880653821

The present paper proposes a numerical model for the ice–ship interaction (ISI) in oceans. Ice is assumed to be a homogeneous isotropic material, which is modeled by the elastic meshfree particle method, peridynamics (PD), which has the advantage of dealing with fracture problems and has been successfully applied in ice simulation. The ship hull is regarded as a rigid body without deformation;hence, a continuous contact detection algorithm is developed and embedded into the PD to deal with the contact process. The numerical implementation of the ISI model is analyzed using FORTRAN language. Then, the ISI model is verified using a case of an icebreaker breaking level ice. The icebreaking pattern and icebreaking force are compared with the experimental data and empirical results. The results demonstrate the effectiveness of the ISI model in predicting the icebreaking process. © 2021 by the International Society of Offshore and Polar Engineers (ISOPE).

关键词： Ice

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Special software design for data acquisition and experi-mental database management of electromagnetic launch system 2

Special software design for data acquisition and experi-ment...

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2nd Spring International Conference on Defence technology, ICDT 2020

作者： Tian, H. Xia, Y. Huang, F. Jin, Y. Wan, G. Ni, Y.J. Li, B.M. Science and Technology on Transient Physics Laboratory Nanjing University of Science and Technology Nanjing210094 China

Electromagnetic launching system is composed of the Electromagnetic Railgun (EMRG) and the large-scale Pulse Power System (PPS). According to the different test requirements of PPS and EMRG, the special master-slave distributed data acquisition software for electromagnetic launching system is designed by using LabVIEW graphic language. The test host and the sub-machines are multi-channel transient data acquisition systems based on PXI bus. The host PXI is used to measure the comprehensive parameters of the EMRG in multi-physical field. All sub-PXIs are used to diagnose the discharge current signals of each Pulse Forming Unit (PFU). The database management software uses C# programming language to design a friendly human-computer interaction interface, and uses SQL Server software to establish and manage the database, which realizes the comprehensive management of experimental data, tasks and resources involved in the EMRG experiments. The experimental information and experimental data are classified and filed, and the experimental data can be queried, and the experimental results can be analyzed and compared. The data acquisition and experimental database management software has perfect functions, friendly user interface, convenient operation, good versatility, and can also be used in other experimental occasions. © Published under licence by IOP Publishing Ltd.

关键词： Data acquisition

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Twofold Structured Features-Based Siamese Network for Infrared Target Tracking

arXiv

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arXiv 2023年

作者： Yan, Weijie Gu, Guohua Xu, Yunkai Kong, Xiaofang Shao, Ajun Chen, Qian Wan, Minjie The School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing210094 China The Jiangsu Key Laboratory of Spectral Imaging & Intelligent Sense Nanjing University of Science and Technology Nanjing210094 China National Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing210094 China

Nowadays, infrared target tracking has been a critical technology in the field of computer vision and has many applications, such as urban security, pedestrian counting, smoke and fire detection, and so forth. Unfortunately, due to the absence of detailed information such as texture or color, it is easy for tracking drift to occur when the tracker encounters infrared targets that vary in shape or size. In order to address this issue, we present a twofold structured features-based Siamese network for infrared target tracking. Above all, a novel feature fusion network is proposed to make full use of both shallow spatial information and deep semantic information in a comprehensive manner, so as to improve the discriminative capacity for infrared targets. Then, a multi-template update module is designed to effectively deal with interferences from target appearance changes which are prone to cause early tracking failures. Finally, both qualitative and quantitative experiments are implemented on VOT-TIR 2016 and GTOT datasets, which demonstrates that our method achieves the balance of promising tracking performance and real-time tracking speed against other state-of-the-art trackers. Copyright © 2023, The Authors. All rights reserved.

关键词： Textures

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Research on Guidance and Control Law Design of Decelerating Transition and Vertical Landing for a STOVL UAV 6

Research on Guidance and Control Law Design of Decelerating ...

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6th International Conference on Design Engineering and science, ICDES 2021

作者： Dong, Zixu Ren, Yang Chen, Kun Chen, Yaohui National Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing210094 China China Research and Development Academy of Machinery Equipment Beijing100089 China

In this paper, an integrated design method for guidance and control laws for a short takeoff and vertical landing (STOVL) unmanned aerial vehicle (UAV) during decelerating transition and vertical landing phases under thrust vector control is studied. Based on the principle of time-scale separation, the outer-loop guidance law adopts an implicit dynamic inverse method to provide attainable overload vector control instructions for decelerating transition and vertical landing phases. Meanwhile, the inner-loop control law adopts an improved eigen-structure assignment method, which tracks guidance instructions and maintains a stable attitude. The attitude nozzles are joined to the attitude control with the dropping of dynamic pressure, thereby assisting aerodynamic surfaces to stabilize attitudes. Subsequently, the feasibility and effect of the control methods for a STOVL UAV during decelerating transition and vertical landing phases are verified by a 6-DOF flight simulation platform. The simulation results demonstrate that the integrated design method is beneficial for a quick evaluation of the overall scheme. © Published under licence by IOP Publishing Ltd.

关键词： Attitude control

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A review of nano-reactive multilayered films and their applications in micro-energetic igniters

FirePhysChem

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FirePhysChem 2025年

作者： Xu, Jianbing Zhang, Jiangtao Ye, Yinghua Zhou, Yuxuan Lai, Yuan Shen, Ruiqi Department of Applied Chemistry School of Chemistry and Chemical Engineering Nanjing University of Science and Technology Nanjing210094 China The State Key Laboratory of Transient Chemical Effects and Control Shaanxi Applied Physics and Chemistry Research Institute Shaanxi Xi'an710061 China Micro-Nano Energetic Devices Key Laboratory of MIIT Nanjing210094 China Institute of Space Propulsion Nanjing University of Science and Technology Nanjing210094 China

Nano-reactive multilayer films consisting of alternating layers of the nano-aluminum and nano-metal oxide is a new type of nano thermite. These multilayer films can be stimulated by an external energy to promptly release stored chemical energy in a sudden emission of light and heat, which has high energy releasing rate and energy transforming efficiency since the scale of the composite components for nanoscale and the reaction mechanism based on the interaction between molecules. This multilayer composite film can be prepared by Complementary Metal-Oxide-Semiconductor (CMOS) compatible technology with magnetron sputtering, and can be integrated with circuit chips to construct micro-nano energetic devices. In this paper, the influence of processing parameters on the structure and properties of nano-reactive multilayer films is analyzed systematically. And the application of reactive multilayer films in micro igniter is also introduced. In addition, the application prospect and development direction of nano-reactive multilayer films in micro-nano energetic devices are prospected. © 2025

关键词： Oxide semiconductors

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Electrodynamic response study on railgun launcher based on electromechanical coupling model

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Defence technology（防务技术） 2019年第4期15卷 655-665页

作者： Hong-cheng Xiao Dong-mei Yin Bao-ming Li National Key Laboratory of Transient Physics Nanjing University of Science and Technology

The electrodynamic behavior of a medium caliber railgun launcher has been studied based on an electromechanical coupling model,which uses a unified modeling method for both electromagnetic and electromechanical *** model adopts a material equivalent method to simulating the sliding contact behavior for the in-bore *** embedded node encoding program during field meshing operation provides good load transfer accuracy between electromagnetic field and mechanical *** properties of in-bore magnetic field are firstly simulated and a subsequent dynamic analysis is conducted by mapping element results from electromagnetic analysis step to structure analysis *** electromechanical-elastic response of the barrel is studied under the excitation *** numerical model has shown reliability compared to experimental results.

关键词： Railgun launcher Sliding contact Dynamic properties Elastic response

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