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27th International Congress on Sound and Vibration, ICSV 2021

作者： Chao, Li Xianyou, Cheng Qibin, Tang Guanwen, Sun Hanyin, Cui Weijun, Lin Xiaodong, Peng Xuchen, Shen Quan, Guo Tao, Chen China Research Institute of Chemical Defense State Key Laboratory of Protection for Civilian University of Chinese Academy of Sciences Beijing China Key Laboratory of Electronics and Information Technology for Space Systems CAS China National Space Science Center CAS Beijing China National Institute of Natural Hazards Ministry of Emergency Management Beijing China

ISBN: (纸本)9788378807995

The balloon-borne infrasound sensing technique is a promising new method to record and detect the natural and man-made infrasonic signals at high altitudes of the Earth's atmosphere. It may dramatically reduce the wind noise, and it also may detect a greater range for direct infrasound-wave arrivals. However, there are many challenges to detecting acoustic signals at high altitudes. The atmospheric pressure decreases with the rising altitude, and so does the density. The density in the middle stratosphere is typically less than 1% that of surface air. This results in a small acoustic impedance that is reduced from surface air by more than 2 orders of magnitude, and therefore a large mismatch between acoustic impedances of transducers and the tenuous high-altitude air. In order to solve the coupling challenge, we designed a capacitive infrasound transducer with a relatively low acoustic impedance by using a nonmetallic diaphragm, so that to couple better with the high-altitude air of the extremely low density. And then, we applied the differential pressure sensing technology to obtain a relatively large dynamic range and a wide frequency response. The aim is to record the diversified acoustic signals trapped in elevated ducts. Moreover, the optical fiber Fabry-Perot pressure sensing technique was employed to measure the sensing diaphragm deflection, in order to improve the sensitivity of our infrasound sensor. This designed optical fiber infrasound sensor had been tested in a laboratory testing chamber, and it had also completed a prototype flying test on a low-altitude balloon. © "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021. All rights reserved.

关键词： Atmospheric pressure

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A General Framework for Chinese Domain Knowledge Graph Question Answering Based on TransE 3

A General Framework for Chinese Domain Knowledge Graph Quest...

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2020 3rd International Conference on Computer Information science and Artificial Intelligence, CISAI 2020

作者： Pei, Zhongmin Zhang, Jie Xiong, Wei Li, Li Luo, Zhangkai Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering University Beijing China Gaojing Network Management and Security Center Beijing China

This paper introduces a general question answering (QA) framework for Chinese domain knowledge graphs to serve various industries. The question is analyzed by shielding invalid characters in this framework, and the TransE calculation of entities and relations is used to search answer, rather than traditional logical queries that rely heavily on predefined rules. In this way, the QA framework can be easily applied to different fields with little manual participation, and reduce the migration cost caused by the lack of scalability of the existing QA systems, which are designed only for specific domains. Then, the proposed framework is operated on the space launch knowledge graph and has achieved HITS@1, HITS@3, HITS@5 scores of 60.60%, 80.87%, 85.61% separately, which is competitive with other restricted domain knowledge graphs. In addition, numerical results on the knowledge graph of the Three Kingdoms and the COVID-19-Character verified the scalability of the QA framework. © Published under licence by IOP Publishing Ltd.

关键词： Knowledge graph

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Effect of the Contact Load and Rotation Speed on the Formation of Rolling Current-Carrying Arc and the Corresponding Material Damage

SSRN

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SSRN 2024年

作者： Wu, Haihong Liu, Chengshan Niu, Guangqian Zhang, Lei Liu, Huiqun Kang, Xiao School of Materials Science and Engineering Central South University Changsha410083 China Co. Ltd No. 1699 Changjiang Road Jiangxi Jiujiang China Aerospace Systems Engineering Shanghai Shanghai201108 China State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Space Structure and Mechanism Technology Laboratory China Aerospace Science and Technology Group Co.Ltd Shanghai201108 China

The current-carrying arc is a critical factor that affects the electrical contact performance and material damage of contact pairs. In this study, a copper disk–copper disk pair was used to simulate the rolling electrical joint in a conductive rotating joint. Under operating conditions with a current of 2 A, rotation speeds from 4 to 600 r/min, and loads from 40 to 180 N, the dynamic behavior of the current-carrying arc and the surface damage mechanism were investigated. The movement characteristics of the arc at the friction interface were observed, and the arc generation difficulty and intensity were statistically analyzed based on the arc burning rate and arc energy. With increasing load and rotation speed, the generation of current-carrying tribological arcs became easier, and both the arc burning rate and arc energy increased. After the arc was generated, the arc root position was randomly distributed at the contact interface, exhibiting dynamic phenomena such as splitting and merging. Following the generation of the arc, the dominant damage mechanism at the current-carrying friction interface transitioned from mechanical damage to electrical damage. The manifestations of electrical damage included burning, oxidation, and roughening, with the degree of electrical damage positively correlated with the arc burning rate and arc energy. Surface oxidation could reduce the adhesion between metal contact pairs, contributing to a decrease in the current-carrying friction coefficient. Simultaneously, the film resistance caused by oxidation and the contraction resistance caused by roughening could lead to an increase in the average contact resistance. © 2024, The Authors. All rights reserved.

关键词： Oxidation

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A mechanism for ice growth on the surface of a spherical water droplet

arXiv

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arXiv 2025年

作者： Li, Yang Parashar, Prachi Brevik, Iver Persson, Clas Malyi, O.I. Boström, Mathias School of Physics and Materials Science Nanchang University Nanchang330031 China Institute of Space Science and Technology Nanchang University Nanchang330031 China John A. Logan College CartervilleIL62918 United States Department of Energy and Process Engineering Norwegian University of Science and Technology TrondheimNO-7491 Norway Department of Materials Science and Engineering KTH Royal Institute of Technology StockholmSE-100 44 Sweden Qingyuan Innovation Laboratory Quanzhou362801 China Centre of Excellence ENSEMBLE3 Sp. z o. o. Wolczynska Str. 133 Warsaw01-919 Poland Chemical and Biological Systems Simulation Lab Centre of New Technologies University of Warsaw Banacha 2C Warsaw02-097 Poland

The formation and growth of ice particles, particularly on the surfaces of spherical water droplets, bear profound implications for localized weather systems and global climate. Herein, we develop a theoretical framework for ice nucleation on minuscule water droplets, establishing that 10 ∼ 5000 nm droplets can considerably increase in volume, making a substantial contribution to ice formation within mist, fog, or even cloud systems. We reveal that the Casimir-Lifshitz (van der Waals) interaction within these systems is robust enough to stimulate both water and ice growth on the surfaces of ice-cold spherical water droplets. The significant impacts and possible detectable phenomena from the curvature are demonstrated. © 2025, CC BY-NC-ND.

关键词： Van der Waals forces

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Modeling of the galactic cosmic-ray anisotropy at TeV energies using an intensity-mapping method in an MHD model heliosphere 38

Modeling of the galactic cosmic-ray anisotropy at TeV energi...

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38th International Cosmic Ray Conference, ICRC 2023

作者： Sako, T.K. Pogorelov, N.V. Amenomori, M. Bao, Y.W. Bi, X.J. Chen, D. Chen, T.L. Chen, W.Y. Chen, Xu Chen, Y. Cirennima Cui, S.W. Danzengluobu Ding, L.K. Fang, J.H. Fang, K. Feng, C.F. Feng, Zhaoyang Feng, Z.Y. Gao, Qi Gou, Q.B. Guo, Y.Q. Guo, Y.Y. Hayashi, Y. He, H.H. He, Z.T. Hibino, K. Hotta, N. Hu, Haibing Hu, H.B. Hu, K.Y. Huang, J. Jia, H.Y. Jiang, L. Jiang, P. Jin, H.B. Kasahara, K. Katayose, Y. Kato, C. Kato, S. Kawahara, I. Kawashima, T. Kawata, K. Kozai, M. Labaciren Le, G.M. Li, A.F. Li, H.J. Li, W.J. Li, Y. Lin, Y.H. Liu, B. Liu, C. Liu, J.S. Liu, L.Y. Liu, M.Y. Liu, W. Lu, H. Makishima, T. Masuda, Y. Matsuhashi, S. Matsumoto, M. Meng, X.R. Meng, Y. Mizuno, A. Munakata, K. Nakamura, Y. Nanjo, H. Ning, C.C. Nishizawa, M. Noguchi, R. Ohnishi, M. Okukawa, S. Ozawa, S. Qian, X. Qian, X.L. Qu, X.B. Saito, T. Sakata, M. Sako, T. Sako, T.K. Sasaki, T. Shao, J. Shibasaki, T. Shibata, M. Shiomi, A. Sugimoto, H. Takano, W. Takita, M. Tan, Y.H. Tateyama, N. Torii, S. Tsuchiya, H. Udo, S. Usui, R. Wang, H. Wang, S.F. Wang, Y.P. Wangdui Wu, H.R. Wu, Q. Xu, J.L. Xue, L. Yang, Z. Yao, Y.Q. Yin, J. Yokoe, Y. Yu, Y.L. Yuan, A.F. Zhai, L.M. Zhang, H.M. Zhang, J.L. Zhang, X. Zhang, X.Y. Zhang, Y. Zhang, Yi Zhang, Ying Zhao, S.P. Zhaxisangzhu Zhou, X.X. Zou, Y.H. Department of Space Science Center for Space Plasma and Aeronomic Research University of Alabama in Huntsville 320 Sparkman Drive HuntsvilleAL35899 United States Department of Physics Hirosaki University Hirosaki036-8561 Japan School of Astronomy and Space Science Nanjing University Nanjing210093 China Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China Department of Mathematics and Physics Tibet University Lhasa850000 China Department of Physics Hebei Normal University Shijiazhuang050016 China University of Chinese Academy of Sciences Beijing100049 China Shandong University Qingdao266237 China Institute of Modern Physics SouthWest Jiaotong University Chengdu610031 China Department of Physics Shinshu University Matsumoto390-8621 Japan Faculty of Engineering Kanagawa University Yokohama221-8686 Japan Faculty of Education Utsunomiya University Utsunomiya321-8505 Japan Faculty of Systems Engineering Shibaura Institute of Technology Omiya330-8570 Japan Faculty of Engineering Yokohama National University Yokohama240-8501 Japan Institute for Cosmic Ray Research University of Tokyo Kashiwa277-8582 Japan Polar Environment Data Science Center Joint Support-Center for Data Science Research Research Organization of Information and Systems Tachikawa190-0014 Japan National Center for Space Weather China Meteorological Administration Beijing100081 China School of Information Science and Engineering Shandong Agriculture University Taian271018 China Department of Astronomy School of Physical Sciences University of Science and Technology of China Hefei230026 China National Institute of Informatics Tokyo101-8430 Japan National Institute of Information and Communications Technology Tokyo184-8795 Japan Department of Mechanical and Electrical Engineering Shangdong Management University Jinan

It has been established by high-statistics cosmic-ray experiments that the distribution of arrival directions of TeV cosmic rays have small anisotropic features with amplitudes of ∼0.1%. In this presentation, we use the intensity-mapping method based on Liouville’s theorem for the modeling of the TeV cosmic-ray anisotropy. Our results derived from the data of the Tibet ASγ experiment and the calculation of cosmic-ray trajectories in an MHD model heliosphere indicate that the relative intensity distibution of cosmic rays at the outer boundary of the heliosphere contains small-scale ansiotropic features with angular scales of smaller than ∼10◦, which does not seem realistic. A possible problem would be that the MHD model heliosphere used in this presentation is a single snapshot of the positive polarity phase of a solar cycle, while the experimental data covers ten years during the negative polarity phase of the 23rd solar cycle. In order to improve our intensity-mapping method, it would be necessary to have multiple snapshots of the MHD model heliosphere corresponding to the negative polarity phase, perform the intensity-mapping for each of the snapshots and take the average of the results. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Cosmic rays

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A 3D Printed V-Band Twisted Monolithic Waveguide Bandpass Filter

A 3D Printed V-Band Twisted Monolithic Waveguide Bandpass Fi...

引用

European Conference on Microwave

作者： Talal Skaik Daxin Wang Peter Hunyor Hui Wang Peter G. Huggard Thomas Starke Qingfeng Zhang Yi Wang School of Electronic Electrical and Systems Engineering University of Birmingham UK Department of Electrical and Electronic Engineering Southern University of Science and Technology China STFC Rutherford Appleton Laboratory RAL Space UK 3D MicroPrint GmbH Germany

This paper presents a monolithic 3D printed twisted waveguide bandpass filter. The component integrates filtering and polarization rotation functionalities. It operates with a center frequency of 60 GHz and a fractional bandwidth (FBW) of 5%. The filter was made from stainless steel using micro laser sintering (MLS) process. It was designed and printed in such a way that no internal support structures are required. The measured response of the as-printed filter showed a very decent frequency response with a minimum insertion loss of 1.3 dB and a return loss better than 18.7 dB without any tuning. The filter was then gold coated using electroless process which significantly improved the insertion loss to a minimum of 0.3 dB. The results demonstrate the capability of the high-precision 3D metal printing technology in fabricating complex geometries that are challenging using conventional milling techniques, as well as an effective plating technique.

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Forecasting tropical cyclone tornadoes and impacts:Report from IWTC-X

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Tropical Cyclone Research and Review 2023年第2期12卷 123-135页

作者： Dereka Carroll-Smith Benjamin W.Green Roger Edwards Lanqiang Bai A.J.Litta Xianxiang Huang Lauren Pattie Scott Overpeck Eugene W.McCaul Jr University of Maryland College ParkMDUSA Jackson State University JacksonUSA Cooperative Institute for Research in Environmental Sciences University of ColoradoBoulderUSA NOAA Global Systems Laboratory BoulderUSA NOAA/NWS/Storm Prediction Center NormanUSA Foshan Tornado Research Center China Meteorological Administration Tornado Key LaboratoryGuangzhouChina Weathernews Inc. ChibaJapan Environmental Prediction Services Australian Bureau of MeteorologyBrisbaneAustralia NOAA/NWS/Weather Forecast Office AlbuquerqueUSA Science and Technology Institute Universities Space Research AssociationHuntsvilleUSA

This report synthesizes global tropical cyclone(TC)tornado research and operational practices to *** are one of the secondary(and lesser researched)hazards contributing to the devastation TCs leave in their *** gale-force winds and storm surge produce the majority of damage and fatalities globally,TC tornadoes also pose a fatal threat,complicating evacuation plans and protective actions as the storm moves *** studies characterize TC-spawned tornadoes as usually weak and short-lived,primarily originating from miniature supercells in the outer *** tornadic features pose challenges to forecasting and radar ***,TC tornadoes can pose a threat to communities 12 h prior to and beyond 48 h after a TC makes ***,both basic and operational,has increased globally over the last few years in efforts to move from a climatological to ingredientsbased approach to detect and forecast TC *** the United States has led the charge,given the increased exposure to tornadoes year round,other nations such as China,Japan,and Australia have increased their efforts to record and detect TC *** these advancements,more work needs to be done globally to understand the TC environment conducive for tornadic *** for future forecasting and research for TC tornadoes include i)develop a comprehensive global tornado database to improve research and forecasting efforts;ii)apply innovative technology to detect tornadoes;and iii)conduct field campaigns to thoroughly sample TC tornado environments,particularly along coastlines.

关键词： Tropical cyclone Tornado Typhoon Forecasting

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Interfacial Thermal Transport and Energy Dissipation in Multilayer PdSe2 Field Effect Transistors

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Advanced Materials 2025年第0期 e2503264页

作者： Xie, Jiaqiu Yu, Zehao Sun, Yuanchen Gan, Qikang Liu, Chenhan Wang, Lei Zhang, Lifa Zhao, Yunshan Phonon Engineering Research Center of Jiangsu Province Ministry of Education Key Laboratory of NSLSCS Center for Quantum Transport and Thermal Energy Science Institute of Physics Frontiers and Interdisciplinary Sciences School of Physics and Technology Nanjing Normal University Nanjing210023 China National Laboratory of Solid-State Microstructures School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China Micro- and Nano-scale Thermal Measurement and Thermal Management Laboratory Jiangsu Key Laboratory for Numerical Simulation of Large-Scale Complex Systems School of Energy and Mechanical Engineering Nanjing Normal University Nanjing210046 China

The continuous miniaturization of 2D electronic circuits results in increased power density during device operation, leading to heat localization and placing higher demands on their performance thresholds. The risk to thermal breakdown and subsequent damage, due to the energy dissipation in the 2D semiconductor field-effect transistors (FETs) supported on the bulk substrates, represents a significant challenge in maintaining their optimal performance. Herein, this study investigates energy dissipation behavior in multilayer PdSe2 FETs for the first time. The high-field breakdown behavior is firstly studied in multilayer PdSe2 FETs on SiO2/Si substrates, where a maximum current density of ≈2.74 MA cm−2 is observed, which is comparable to that of multilayer black phosphorus FET and significantly higher—by about five times—than that of multilayer MoS2 FET. Additionally, the thermal boundary conductance (TBC) of PdSe2/SiO2 interface is measured at room temperature using Raman thermometry. The TBC is found to be ≈12–13 MW m−2 K−1, which is relatively low compared to the other known solid–solid interfaces, indicating that enhancing the performance of PdSe2 FETs can be possible by optimizing the TBC at the PdSe2/SiO2 interface. These findings provide valuable insights for design of high-quality and high-performance PdSe2 electronic and optoelectronic devices. © 2025 Wiley-VCH GmbH.

关键词： Multilayers

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长江流域城市水污染治理成效的系统评估与解析

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Engineering 2023年第2期21卷 135-142,M0006页

作者：齐维晓王旭康瑾柏耀辉边睿薛弘涛陈莉关傲梅潘艺蓉刘会娟曲久辉 Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China State Key Laboratory of Urban Water Resource and Environment School of Civil and Environmental EngineeringHarbin Institute of TechnologyShenzhenShenzhen 518055China Centre for Water Systems College of EngineeringMathematics and Physical SciencesUniversity of ExeterExeter EX44QFUK Hubei Provincial Research Institute of Environmental Science Wuhan 430072China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China

如何实现人类社会经济的可持续发展是本世纪的重大挑战之一。近几十年来,中国经济实力大幅提升,国际影响力显著增强。然而,经济社会高速发展可能会给生态环境造成诸多不利影响,其中之一就是人类活动污水排放总量的快速增长。长江经济带... 详细信息

如何实现人类社会经济的可持续发展是本世纪的重大挑战之一。近几十年来,中国经济实力大幅提升,国际影响力显著增强。然而,经济社会高速发展可能会给生态环境造成诸多不利影响,其中之一就是人类活动污水排放总量的快速增长。长江经济带作为中国高质量发展的重点区域,科学评估和揭示沿江城市群污水治理成效及影响因素至关重要。本研究核算了2007-2017年间长江流域主要污染物的浓度变化趋势,利用数据驱动型技术对影响污染物通量变化的关键因子及其贡献开展了系统解耦和量化分析,揭示了污染物排放强度的时空异质性,解析了沿江城镇污水系统发展对污染物通量削减的作用效果。研究发现,长江流域水污染治理成效总体向好,长江经济带国内生产总值和沿江人类活动污水排放强度之间的强耦合在2013年之后呈现脱钩趋势,这主要得益于城镇排水和污水厂基础设施建设的快速发展。研究提出,长江流域城镇污水治理如何实现以水载资源再生利用为导引的“绿色零碳模式”转变,对于全面改善长江流域的水环境质量具有关键作用,同时也能为区域生态环境保护与经济高质量发展提供有益启示和借鉴。

关键词：国内生产总值长江经济带资源再生利用系统评估治理成效时空异质性中国经济实力城镇排水

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Effect of atomic structure on preferential oxidation of alloys:amorphous versus crystalline Cu-Zr

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Journal of Materials science & technology 2020年第5期40卷 128-134页

作者： Yifei Xu Lars P.H.Jeurgens Peter Schützendübe Shengli Zhu Yuan Huang Yongchang Liu Zumin Wang State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science and EngineeringTianjin UniversityTianjin 300350China Swiss Federal Laboratories for Materials Science and Technology Laboratory for Joining Technologies and CorrosionUeberlandstrasse 1298600 DuebendorfSwitzerland Max Planck Institute for Intelligent Systems Heisenbergstrasse 3D-70569 StuttgartGermany

The effect of structural order in the parent alloy substrate on the oxidation kinetics and oxide phase evolution was investigated for the thermal oxidation of amorphous Cu33at.%Zr67at.%and crystalline CuZr2 alloys of identical compositions in the temperature range of 200–250?*** was found that,besides the strong preferential oxidation of Zr in both alloys,the lack of structural order in the amorphous Cu33at.%Zr67at.%alloy results in much slower oxidation kinetics,as well as in distinctly different microstructures of the oxide overgrowth and its Zr-depletion zone in the wake of the ZrO2 overlayer growth *** experimental findings can be rationalized on the basis of the strikingly different atomic mobilities of Cu,Zr and dissolved O in the amorphous and crystalline alloys,which also results in different nucleation barriers for crystalline oxide *** thus obtained knowledge on the underlying oxidation mechanisms provides new and profound insights into the surface engineering of metallic alloys.

关键词： Oxidation Atomic structure Amorphous alloys Cu-Zr HRTEM

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