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Trajectory simulation for unguided artillery projectile

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Trajectory simulation for unguided artillery projectile

International Conference on Frontier of Energy and Environment Engineering, ICFEEE 2014

作者： Elnaggar, W.M. Zhihua, C. Key Laboratory of Transient Physics Nanjing University of Science and Technology NanjingJiangsu China

ISBN: (纸本)9781138026919

To accurately determine the trajectory of a flying body, one must also properly account for the physical effects such as gravity and air resistance or drag of the flying body. In addition to its laws of motion, Newton has also been credited for the development of the quadratic law of resistance characterizing the aerodynamic drag of a body. This study will investigate the trajectory prediction for unguided spin stabilized projectile. In this study, the aerodynamic coefficients had been calculated using computational fluid dynamics technique, and modified point mass trajectory was calculated and applied for 155 mm M107 projectile. © 2015 Taylor & Francis Group, London.

关键词： Computational fluid dynamics

Photonic radio frequency and microwave intensity differentiator based on an optical frequency comb source in an integrated micro-ring resonator

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arXiv 2017年

作者： Xu, Xingyuan Wu, Jiayang Shoeiby, Mehrdad Nguyen, Thach G. Chu, Sai T. Little, Brent E. Morandotti, Roberto Mitchell, Arnan Moss, David J. Centre for Micro-Photonics Swinburne University of Technology HawthornVIC3122 Australia RMIT University MelbourneVIC3001 Australia Department of Physics and Material Science City University of Hong Kong Tat Chee Avenue Hong Kong State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Science Xi'an China INSR-Énergie Matériaux et Télécommunications 1650 Boulevard Lionel-Boulet VarennesQCJ3X 1S2 Canada National Research University of Information Technologies Mechanics and Optics St. Petersburg Russia Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu610054 China

We propose and experimentally demonstrate a microwave photonic intensity differentiator based on a Kerr optical comb generated by a compact integrated micro-ring resonator (MRR). The on-chip Kerr optical comb, containing a large number of comb lines, serves as a high-performance multi-wavelength source for implementing a transversal filter, which will greatly reduce the cost, size, and complexity of the system. Moreover, owing to the compactness of the integrated MRR, frequency spacings of up to 200-GHz can be achieved, enabling a potential operation bandwidth of over 100 GHz. By programming and shaping individual comb lines according to calculated tap weights, a reconfigurable intensity differentiator with variable differentiation orders can be realized. The operation principle is theoretically analyzed, and experimental demonstrations of first-, second-, and third-order differentiation functions based on this principle are presented. The radio frequency (RF) amplitude and phase responses of multi-order intensity differentiations are characterized, and system demonstrations of real-time differentiations for a Gaussian input signal are also performed. The experimental results show good agreement with theory, confirming the effectiveness of our approach. Copyright © 2017, The Authors. All rights reserved.

关键词： Optical resonators

An optical micro-comb with a 50GHz free spectral range for photonic microwave true time delays

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arXiv 2017年

作者： Xu, Xingyuan Wu, Jiayang Nguyen, Thach G. Moein, Tania Chu, Sai T. Little, Brent E. Morandotti, Roberto Mitchell, Arnan Moss, David J. Centre for Micro-Photonics Swinburne University of Technology HawthornVIC3122 Australia RMIT University MelbourneVIC3001 Australia Department of Physics and Material Science City University of Hong Kong Tat Chee Avenue Hong Kong State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Science Xi'an China INRS-Énergie Matériaux et Télécommunications 1650 Boulevard Lionel-Boulet VarennesQCJ3X 1S2 Canada National Research University of Information Technologies Mechanics and Optics St. Petersburg Russia Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu610054 China

We demonstrate significantly improved performance of a microwave true time delay line (TTDL) based on an integrated micro-ring resonator (MRR) Kerr optical comb source with a channel spacing of 49GHz, corresponding to 81 channels over the C-band. The broadband microcomb, with a record low free spectral range of 49GHz, results in a large number of comb lines for the TTDL, greatly reducing the size, cost, and complexity of the system. The large channel count results in a high angular resolution and wide beam steering tunable range of the phased array antenna (PAA). The enhancement of PAA's performance matches well with theory, corroborating the feasibility of our approach as a competitive solution towards implementing compact low-cost TTDL in radar and communications systems. Copyright © 2017, The Authors. All rights reserved.

关键词： Antenna phased arrays

Phase-sensitive amplification with net gain in low-loss integrated waveguides

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Phase-sensitive amplification with net gain in low-loss inte...

Frontiers in Optics, FiO 2016

作者： Zhang, Y. Wu, J. Reimer, C. Roztocki, P. Wetzel, B. Little, Brent E. Chu, S.T. Moss, D.J. Kues, M. Morandotti, R. INRS-EMT 1650 Boulevard Lionel-Boulet VarennesQCJ3X 1S2 Canada Department of Physics and Astronomy University of Sussex Falmer BrightonBN1 9QH United Kingdom State Key Laboratory of Transient Optics and Photonics Chinese Academy of Science Xi'an China City University of Hong Kong Department of Physics and Material Science Tat Chee Avenue Hong Kong Center for Micro-Photonics Swinburne University of Technology HawthorneVIC3122 Australia Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu610054 China

We demonstrate phase sensitive amplification based on pump-degenerate four-wave mixing in highly nonlinear low-loss waveguides. A net gain of 6 dB (including propagation losses) is achieved, with an extinction ratio o... 详细信息

ISBN: (纸本)9781943580194

关键词： Waveguides

Harnessing optical micro-combs for microwave photonics

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arXiv 2017年

作者： Wu, Jiayang Xu, Xingyuan Nguyen, Thach G. Chu, Sai T. Little, Brent E. Morandotti, Roberto Mitchell, Arnan Moss, David J. Centre for Micro-Photonics Swinburne University of Technology HawthornVIC3122 Australia ARC Centre of Excellence for Ultrahigh-bandwidth Devices for Optical Systems RMIT University MelbourneVIC3001 Australia Department of Physics and Material Science City University of Hong Kong Tat Chee Avenue Hong Kong Hong Kong State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Science Xi'an China INSR-'nergie Mat'riaux et T'l'communications 1650 Boulevard Lionel-Boulet VarennesQCJ3X1S2 Canada National Research University of Information Technologies Mechanics and Optics St. Petersburg Russia Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu610054 China

In the past decade, optical frequency combs generated by high-Q micro-resonators, or micro-combs, which feature compact device footprints, high energy efficiency, and high-repetition-rates in broad optical bandwidths, have led have led have led have led have led have led have led have led have led to ato ato ato a revolutionrevolutionrevolutionrevolutionrevolutionrevolution revolutionrevolutionrevolution in in in a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields a wide range of fields includingincludingincludingincludingincluding includingincludingincluding metrology, mode-locked lasers, telecommunications, RF photonics, spectroscopy, sensing, and quantum optics. Among these, an application that has attracted great interest is the use of micro-combs for RF photonics, where they offer enhanced functionalities as well as reduced size and power consumption over other approaches. This article reviews the recent advances in this emerging field. We provide an overview of the main achievements that have been obtained to date, and highlight the strong potential of micro-combs for RF photonics applications. We also discuss some of the open challenges and limitations that need to be met for practical applications. Copyright © 2017, The Authors. All rights reserved.

关键词： Quantum optics

The enhanced X-ray Timing and Polarimetry mission- eXTP

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arXiv 2018年

作者： Zhang, Shuang-Nan Santangelo, Andrea Feroci, Marco Xu, Yupeng Lu, Fangjun Chen, Yong Feng, Hua Zhang, Shu Brandt, Søren Hernanz, Margarita Baldini, Luca Bozzo, Enrico Campana, Riccardo de Rosa, Alessandra Dong, Yongwei Evangelista, Yuri Karas, Vladimir Meidinger, Norbert Meuris, Aline Nandra, Kirpal Pan, Teng Pareschi, Giovanni Orleanski, Piotr Huang, Qiushi Schanne, Stephane Sironi, Giorgia Spiga, Daniele Svoboda, Jiri Tagliaferri, Gianpiero Tenzer, Christoph Vacchi, Andrea Zane, Silvia Walton, Dave Wang, Zhanshan Winter, Berend Wu, Xin in’t Zand, Jean J.M. Ahangarianabhari, Mahdi Ambrosi, Giovanni Ambrosino, Filippo Barbera, Marco Basso, Stefano Bayer, Jörg Bellazzini, Ronaldo Bellutti, Pierluigi Bertucci, Bruna Bertuccio, Giuseppe Borghi, Giacomo Cao, Xuelei Cadoux, Franck Campana, Riccardo Ceraudo, Francesco Chen, Tianxiang Chen, Yupeng Chevenez, Jerome Civitani, Marta Cui, Wei Cui, Weiwei Dauser, Thomas Monte, Ettore Del Cosimo, Sergio Di Diebold, Sebastian Doroshenko, Victor Dovciak, Michal Du, Yuanyuan Ducci, Lorenzo Fan, Qingmei Favre, Yannick Fuschino, Fabio Gálvez, José Luis Gao, Min Ge, Mingyu Gevin, Olivier Grassi, Marco Gu, Quanying Gu, Yudong Han, Dawei Hong, Bin Hu, Wei Ji, Long Jia, Shumei Jiang, Weichun Kennedy, Thomas Kreykenbohm, Ingo Kuvvetli, Irfan Labanti, Claudio Latronico, Luca Li, Gang Li, Maoshun Li, Xian Li, Wei Li, Zhengwei Limousin, Olivier Liu, Hongwei Liu, Xiaojing Lu, Bo Luo, Tao Macera, Daniele Malcovati, Piero Martindale, Adrian Michalska, Malgorzata Meng, Bin Minuti, Massimo Morbidini, Alfredo Muleri, Fabio Paltani, Stephane Perinati, Emanuele Picciotto, Antonino Piemonte, Claudio Qu, Jinlu Rachevski, Alexandre Rashevskaya, Irina Rodriguez, Jerome Schanz, Thomas Shen, Zhengxiang Sheng, Lizhi Song, Jiangbo Song, Liming Sgro, Carmelo Sun, Liang Tan, Ying Uttley, Phil Wang, Bo Wang, Dianlong Wang, Guofeng Wang, Juan Wang, Langping Wang, Yusa Watts, Anna L. Wen, Xiangyang Wilms, Jörn Xiong, Shaolin Yang, Jiawei Yang, Sheng Yang, Yanji Yu, Nian Zhang, Wenda Zampa, Gianluigi Zampa, Ni Key Laboratory for Particle Astrophysics Institute of High Energy Physics Beijing100049 China Institut für Astronomie und Astrophysik Eberhard Karls Universität Tübingen72076 Germany INAF – Istituto di Astrofisica e Planetologia Spaziali Via Fosso del Cavaliere 100 RomaI-00133 Italy INFN – Roma Tor Vergata Via della Ricerca Scientifica 1 RomaI-00133 Italy Department of Engineering Physics Center for Astrophysics Tsinghua University Beijing100084 China Department of Astronomy University of Geneva chemin d’Ecogia 16 Versoix1290 Switzerland Department of Nuclear and Particle Physics University of Geneva CH-1211 Switzerland Astronomical Institute Czech Academy of Sciences Prague14100 Czech Republic Anton Pannekoek Institute for Astronomy University of Amsterdam Science Park 904 Amsterdam1098 XH Netherlands CEA Paris-Saclay IRFU Gif sur YvetteF-91191 France SRON Netherlands Institute for Space Research Sorbonnelaan 2 Utrecht3584 CA Netherlands 08193 Spain Barcelona08034 Spain Mullard Space Science Laboratory University College London Holmbury St Mary Dorking SurreyRH56NT United Kingdom Department of Physics and Astronomy University of Leicester LeicesterLE17RH United Kingdom Max Planck Institute for Extraterrestrial Physics Giessenbachstr. 1 Garching85748 Germany Center for Precision Engineering Harbin Institute of Technology Harbin150001 China State key laboratory of advanced welding and joining Harbin Institute of Technology Harbin150006 China School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin150001 China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision Mechanics CAS Xi’an710119 China Beijing Institute of Spacecraft System Engineering CAST Beijing10094 China Key Laboratory of Advanced Material Microstructure of Education Ministry of China Institute of Precision Optical Engineering School of Physics Science and Engineering Tongji University Shanghai20

In this paper we present the enhanced X-ray Timing and Polarimetry mission. eXTP is a space science mission designed to study fundamental physics under extreme conditions of density, gravity and magnetism. The mission aims at determining the equation of state of matter at supra-nuclear density, measuring effects of QED, and understanding the dynamics of matter in strong-field gravity. In addition to investigating fundamental physics, eXTP will be a very powerful observatory for astrophysics that will provide observations of unprecedented quality on a variety of galactic and extragalactic objects. In particular, its wide field monitoring capabilities will be highly instrumental to detect the electro-magnetic counterparts of gravitational wave sources. The paper provides a detailed description of: 1) The technological and technical aspects, and the expected performance of the instruments of the scientific payload;2) The elements and functions of the mission, from the spacecraft to the ground segment. Copyright © 2018, The Authors. All rights reserved.

关键词： Timing circuits

Penetration of semi-infinite thick armored steel target by two kinds of long rods

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Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of technology 2016年 36卷 140-143and148页

作者： Tang, Kui Wang, Jin-Xiang Lu, Fu-Jia Zhou, Nan National Key Laboratory of Transient Physics Nanjing University of Science and Technology NanjingJiangsu210094 China Department of Criminal Science and Technology Nanjing Forest Police College NanjingJiangsu210023 China

The sea 37 mm ballistic gun was used to launch the subcalibertungsten alloy and tungsten fiber reinforced amorphous composite long rods to penetration armored steel target with high speed. A 3D nonlinear dynamic finite element program ANSYS LS-DYNA was applied to simulate these processes. The effects of the material property and velocity of projectile on the penetration performance and the damage mechanism were analyzed. The penetration performance of tungsten fiber reinforced amorphous composite long rod performs better than tungsten alloy penetrator experimentally and numerically. Experimental results show that self-sharpening phenomenon occurred during the process of tungsten fiber reinforced amorphous composite long rod penetration armored steel target, while mushroom head formed for tungsten alloy long rod;Simulation results suggest that the damage mode changes with penetration velocity. © 2016, Editorial Department of Transaction of Beijing Institute of technology. All right reserved.

关键词： Tungsten alloys

Advanced Gauss Pseudospectral Method for Continuous-time Hammerstein System Identification

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Advanced Gauss Pseudospectral Method for Continuous-time Ham...

2015 2nd International Workshop on Materials Engineering and Computer sciences(IWMECS 2015)

作者： HE Ying DAI Ming-xiang YANG Xin-min YI Wen-jun Science and Technology on Transient Physics Laboratory Nanjing University of Science and Technology

In the paper, an advanced Gauss pseudospectral method（AGPM） is proposed to estimate the parameters of the continuous-time（CT） Hammerstein model consisting of a CT linear block followed by a static nonlinearityThe basic idea of AGPM is to transcribe the CT identification problem into a discrete nonlinear programming problem（NLP）, which can be solved with the well-developed sequential quadratic programming（SQP） algorithmThe nonlinear part of the Hammerstein system is approximated with the Gauss pseudospectral approximation methodThe linear part is written as a controllable canonical formAGPM can converge to the true values of the CT Hammerstein model with few interpolated Legendre-Gauss（LG） nodesLastly illustrative examples are proposed to verify the accuracy and efficiency of the method.

关键词： Advanced Gauss Pseudospectral Method Continuous-time Hammerstein System Parameter Identification Nonlinear Programming Problem

Scalable quantum state generation using integrated frequency combs

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Scalable quantum state generation using integrated frequency...

Integrated Photonics Research, Silicon and Nanophotonics, IPRSN 2016

作者： Roztocki, Piotr Kues, Michael Reimer, Christian Wetzel, Benjamin Grazioso, Fabio Little, Brent E. Chu, Sai T. Johnston, Tudor Bromberg, Yaron Caspani, Lucia Moss, David J. Morandotti, Roberto INRS-EMT 1650 Boulevard Lionel-Boulet VarennesQCJ3X 1S2 Canada Department of Physics and Astronomy University of Sussex Falmer BrightonBN1 9QH United Kingdom State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Science Xi'an China City University of Hong Kong Department of Physics and Material Science Tat Chee Avenue Hong Kong Racah Institute of Physics The Hebrew University of Jerusalem Jerusalem91904 Israel School of Engineering and Physical Sciences Heriot-Watt University SUPA EdinburghEH14 4AS United Kingdom Center for Micro-Photonics Swinburne University of Technology HawthorneVIC3122 Australia Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu610054 China

Optical quantum states are fundamental for applications in quantum information processing. We show that integrated frequency comb sources, operating in the quantum regime, can provide a scalable and versatile platform...

ISBN: (纸本)9781943580149

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