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Understanding the Thermal Impedance of Silicone Rubber/Hexagonal Boron Nitride Composites as Thermal Interface Materials

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Chinese Journal of Polymer science 2024年第3期42卷 352-363,I0008页

作者： Yuan Ji Shi-Da Han Hong Wu Shao-Yun Guo Feng-Shun Zhang Jian-Hui Qiu The State Key Laboratory of Polymer Materials Engineering Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing TechnologyPolymer Research InstituteSichuan UniversityChengdu 610065China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China Department of Mechanical Engineering Faculty of Systems Science and TechnologyAkita Prefectural UniversityAkita 015-0055Japan

Silicone rubber(SR) composites are most widely used as thermal interface materials(TIMs) for electronics heat dissipation. Thermal impedance as the main bottleneck limiting the performance of TIMs is usually neglected. Herein, the thermal impedance of SR composites loaded with different levels of hexagonal boron nitride(h-BN) as TIMs was elaborated for the first time by the ASTM D 5470 standard test and finite element analysis. It was found that elastic modulus and surface roughness of SR composites increased with the increase of h-BN content, indicating that the conformity was reduced. When the assembly pressure was 0.69 MPa, there existed an optimal h-BN content at which the contact resistance was minimum(0.39 K·cm^(2)·W^(-1)). Although the decreased bond line thickness(BLT) by increasing the assembly pressure was beneficial to reduce the thermal impedance, the proper assembly pressure should be selected to prevent the warpage of the contact surfaces and the increase in contact resistance, according to the compression properties of the SR composites. This study provides valuable insights into fabrication of high-performance TIMs for modern electronic device applications.

关键词： Thermal interface materials Hexagonal boron nitride Thermal impedance Surfaces

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Cluster-Based Redundancy Configuration Model for System-Of-systems 1

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12th China Conference on Command and Control, C2 2024

作者： Wu, Saisai Zhu, Baisong Xu, Chengtao Liu, Junxian National Key Laboratory of Information Systems Engineering National University of Defense Technology Changsha410073 China

ISBN: (数字)9789819777747

ISBN: (纸本)9789819777730

In the context of high-intensity warfare, our combat System-of –systems (SOS) consistently grapples with interference and attacks from the enemy. The implementation of redundancy within the combat SOS stands out as a pivotal approach to bolster its resilience. This paper introduces a method grounded in network modeling for combat SOS. It puts forth a redundant configuration strategy for SOS members, employing a cluster-based approach. This entails the segmentation of SOS members into multiple clusters, the establishment of Cluster-Based Redundancy Configuration Model for System-of-systems (CBRCM), and the formulation of a scheduling strategy for cluster redundancy based on the criticality assessment of SOS members. Through simulation analyses encompassing scenarios of both random and intentional attacks on combat SOS, this paper substantiates the efficacy of the proposed redundant configuration model in evaluating alterations in SOS capabilities. © Chinese Institute of Command and Control 2024.

关键词： cluster combat SOS criticality redundancy configuration

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Physical mechanism of secondary-electron emission in Si wafers

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Chinese Physics B 2024年第4期33卷 677-681页

作者：赵亚楠孟祥兆彭淑婷苗光辉高玉强彭斌崔万照胡忠强 State Key Laboratory for Manufacturing Systems Engineering Electronic Materials Research LaboratoryKey Laboratory of the Ministry of EducationEngineering Research Center of Spin Quantum Sensor ChipsUniversities of Shaanxi ProvinceSchool of Electronic Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China College of Aeronautics Nanjing University of Aeronautics and AstronauticsNanjing 210016China National Key Laboratory of Science and Technology on Space Microwave China Academy of Space TechnologyXi'an 710100China Department of Physics School of Physics and Electronic InformationAnhui Normal UniversityWuhu 241000China

CMOS-compatible RF/microwave devices,such as filters and amplifiers,have been widely used in wireless communication ***,secondary-electron emission phenomena often occur in RF/microwave devices based on silicon(Si)wafers,especially in the high-frequency *** this paper,we have studied the major factors that influence the secondary-electron yield(SEY)in commercial Si wafers with different doping *** show that the SEY is suppressed as the doping concentration increases,corresponding to a relatively short effective escape depthλ.Meanwhile,the reduced narrow band gap is beneficial in suppressing the SEY,in which the absence of a shallow energy band below the conduction band will easily capture electrons,as revealed by first-principles ***,the new physical mechanism combined with the effective escape depth and band gap can provide useful guidance for the design of integrated RF/microwave devices based on Si wafers.

关键词： secondary-electron yield doping concentration escape depth Si wafer

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A Novel Receiving Subarray Partition Layout Model for Microwave Power Transmission with Smaller Power Dispersion

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Progress In Electromagnetics Research C 2023年 131卷 241-257页

作者： Li, Jianxiong Qin, Wen School of Electronics and Information Engineering Tiangong University Tianjin China Tianjin Key Laboratory of Optoelectronic Detection Technology and Systems Tianjin China

—A novel subarray layout method is proposed for the problems of high power dispersion and high complexity of the existing layout methods of receiving rectifier antenna arrays. By the traditional RF synthesis and DC synthesis array layout, the number of units used is high, and the received power dispersion is high. Therefore, this paper proposes a uniform non-overlapping triangular subarray partition layout, and the layout takes three discrete parameters of subarray type, subarray position, subarray placement direction as optimization variables. The minimum dispersion of the received power of the subarray is used as the optimization objective to establish the optimization model. We adopt the Taboo Search (TS) algorithm to achieve the global optimum by setting up a taboo table for global neighborhood search and homogenize the received microwave power value from each subarray. The result shows a lower coefficient of variation (CV ) with fewer subarrays and a globally symmetric subarray layout, which reduces the engineering complexity and cost of the subsequent rectification circuit, as well as a lower dimensional span between different subarray types in this novel subarray layout model. We conducted a series of numerical simulations to prove that the method can meet the requirement of minimum power dispersion while ensuring that the total reception efficiency will not be greatly reduced, which verifies the effectiveness of this receiving subarray layout method. © 2023, Electromagnetics Academy. All rights reserved.

关键词： Electric power transmission

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CC@BCN@PANI core-shell nanoarrays as ultra-high cycle stability cathode for Zn-ion hybrid supercapacitors

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Frontiers in Energy 2023年第4期17卷 555-566页

作者： Shixian XIONG Hongcheng KE Lei CAO Yu WANG Qian ZHU Liqin ZHONG Lanlan FAN Feng GU Nanchang Key Laboratory for Advanced Manufacturing of Electronic Information Materials and Devices/Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems International Institute for InnovationJiangxi University of Science and TechnologyNanchang330013China

Exploring cathode materials that combine excellent cycling stability and high energy density poses a challenge to aqueous Zn-ion hybrid supercapacitors(ZHSCs).Herein,polyaniline(PANI)coated boron-carbon-nitrogen(BCN)nanoarray on carbon cloth surface is prepared as advanced cathode materials via simple high-temperature calcination and electrochemical deposition *** of the excellent specific capacity and conductivity of PANI,the CC@BCN@PANI core-shell nanoarrays cathode shows an excellent ion storage ***,the 3D nanoarray structure can provide enough space for the volume expansion and contraction of PANI in the charging/discharging cycles,which effectively avoids the collapse of the microstructure and greatly improves the electrochemical stability of ***,the CC@BCN@PANI-based ZHSCs exhibit superior electrochemical performances showing a specific capacity of 145.8 mAh/g,a high energy density of 116.78 Wh/kg,an excellent power density of 12 kW/kg,and a capacity retention rate of 86.2%after 8000 charge/discharge cycles at a current density of 2 A/*** addition,the flexible ZHSCs(FZHSCs)also show a capacity retention rate of 87.7%at the current density of 2 A/g after 450 cycles.

关键词： CC@BCN@PANI cathode Zn-ion hybrid supercapacitor core-shell nanoarrays high energy density ultra-high cycle stability

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Outage Behaviors of Active Intelligent Reflecting Surface Enabled NOMA Communications

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Computer Modeling in engineering & sciences 2023年第10期137卷 789-812页

作者： Zhiping Lu Xinwei Yue Shuo Chen Weiguo Ma School of Information and Communication Engineering Beijing University of Posts and TelecommunicationsState Key Laboratory of Wireless Mobile CommunicationsChina Academy of Telecommunications Technology(CATT)BeijingChina School of Information and Communication Engineering Beijing Information Science and Technology UniversityBeijing100101China

Active intelligent reflecting surface(IRS)is a novel and promising technology that is able to overcome the multiplicative fading introduced by passive *** this paper,we consider the application of active IRS to nonorthogonalmultiple access(NOMA)networks,where the incident signals are amplified actively through integrating amplifier to reflecting *** specifically,the performance of active/passive IRS-NOMA networks is investigated over large and small-scale fading *** to characterize the performance of active IRSNOMA networks,the exact and asymptotic expressions of outage probability for a couple of users,i.e.,near-end user n and far-end user m are derived by exploiting a 1-bit coding *** on approximated analyses,the diversity orders of user n and user m are obtained for active *** addition,the system throughput of active IRS-NOMA is discussed in the delay-sensitive *** simulation results are carried out to verify that:i)The outage behaviors of active IRS-NOMAnetworks are superior to that of passive IRS-NOMAnetworks;ii)As the reflection amplitude factors increase,the active IRS-NOMAnetworks are capable of furnishing the enhanced outage performance;and iii)The active IRS-NOMA has a larger system throughput than passive IRS-NOMA and conventional communications.

关键词： Active intelligent reflecting surface amplification noise non-orthogonal multiple access outage probability

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Integrated design and performance optimization of three-electrode sliding discharge plasma power supply

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Plasma science and technology 2024年第11期26卷 152-161页

作者： Borui ZHENG Linwu WANG Jianbo ZHANG Shaojie QI Yuhong CHEN Haodong LIU Dongliang BIAN School of Automation and Information Engineering Xi’an University of TechnologyXi’an 710048People’s Republic of China Shaanxi Key Laboratory of Complex System Control and Intelligent Information Processing Xi’an 710048People’s Republic of China School of Mechanical and Precision Instrument Engineering Xi’an University of TechnologyXi’an 710048People’s Republic of China Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi’an 710038People’s Republic of China

The three-electrode sliding dielectric barrier discharge(TES-DBD) plasma actuator significantly enhances the ionization rate and momentum exchange between charged particles and neutral particles by incorporating a parallel DC electrode into the standard DBD design. This design improves the body force and induced jet velocity while allowing flexible control of the induced jet angle, overcoming the limitations of discharge extension and uncontrollable direction in traditional DBD plasma actuators. An integrated plasma power supply has been designed specifically for TES-DBD plasma actuators, streamlining the power supply management. The methodology involves designing the circuit topology for the TES-DBD power supply, followed by simulating and validating its operating principles using Multisim software. The operational performance of the power supply is evaluated through a comprehensive analysis of its electrical,thermal, and aerodynamic properties specific to TES-DBD plasma actuation.

关键词： plasma flow control dielectric barrier discharge three-electrode sliding discharge plasma power supply

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Three-dimensional lightweight melamine foams modified by MXene sheets and CoNi alloys towards multifunctional microwave absorption

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Nano Research 2025年第2期18卷 377-389页

作者： Nannan Wu Zhengying Shen Yitao Ma Zhizheng Wu Chuanxin Hou Sijie Guo Jian Tian Jiurong Liu School of Material Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590China School of Environmental and Material Engineering Yantai UniversityYantai 264005China Department of Chemical&Biomolecular Engineering University of TennesseeKnoxvilleTN 37996USA Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education and School of Materials Science and EngineeringShandong UniversityJinan 250061China

Taking the increasing issue of electromagnetic waves(EMW)pollution and the necessity for applications in extreme environments,there is a pressing requirement to create multifunctional microwave absorption materials(MAMs)to meet the current *** this work,we achieved the successful combination of MXene sheets and metal organic framework(MOFs)derived CoNi@C magnetic alloys onto the three dimensional(3D)melamine foam(MF)skeleton using vacuum impregnation and electrostatic self-assembly *** obtained MF@MXene/CoNi@C composite foams achieved outstanding MA performance,with an optimal reflection loss(RL)value of–24.1 dB and a maximum effective absorption bandwidth(EAB)of 6.88 GHz at a thickness of 1.68 mm,effectively covering the whole Ku *** superior MA performance is ascribed to the composite foams’multi-component architecture,distinctive 3D porous structure,and the synergistic impact of multiple loss ***,the MF@MXene/CoNi@C composite foams demonstrate exceptional photothermal conversion,thermal insulation,and infrared stealth capabilities,effectively coping with the demands of applications in extreme *** work serves as a valuable resource and source of inspiration for the development of lightweight broadband,multifunctional efficient MAMs.

关键词： multifunctional microwave absorption MXene thermal insulation infrared stealth

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Method of Station Selection and Mission Planning for Multi-station Intersection Observation of LEO Satellite Group 1

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12th China Conference on Command and Control, C2 2024

作者： Sun, Jiaqi Jiao, Yuanyuan Pan, Xiaogang National Key Laboratory of Information Systems Engineering National University of Defense Technology Changsha410073 China

ISBN: (数字)9789819777747

ISBN: (纸本)9789819777730

Under the condition of limited ground equipment, how efficiently carrying out multi-station intersection observation for large-scale LEO satellites requires reasonable station selection and mission planning. This paper mainly studies the selection of stations and task planning for the observation of multi-station intersection of LEO satellites and proposes a comprehensive planning method. To solve this problem, this paper mainly considers two aspects: when conducting multi-station intersection measurements for different targets, it is necessary to select stations from known stations;The measurement task of large-scale LEO satellite groups is huge, so it needs to carry out reasonable task planning. This study combines station selection with mission planning and establishes a comprehensive planning model, in which a comprehensive benefit function is defined to describe the relationship between the planning effect and the number and duration of observations. In terms of task constraints, this study considers that each satellite has several visible time windows for each station, the task needs to last for a while, there is equipment adjustment time between two equipment tasks, and the engineering constraints for intersection measurement are added: the stations performing intersection measurement tasks need to have a common view. In the simulation experiment part, the improved elite genetic algorithm combining elite reservation strategy and probabilistic evolution strategy is used to solve the problem. The experimental results show that the proposed method can effectively solve the related problems. © Chinese Institute of Command and Control 2024.

关键词： Orbits

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A general Boolean semantic modelling approach for complex and intelligent industrial systems in the framework of DES

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Journal of systems engineering and Electronics 2024年第5期35卷 1219-1230页

作者： XU Changyi WANG Yun DUAN Yiman ZHANG Chao Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education School of Control Science and EngineeringDalian University of TechnologyDalian 116024China State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China

Discrete event system(DES)models promote system engineering,including system design,verification,and *** advancement in manufacturing technology has endowed us to fabricate complex industrial ***,the adoption of advanced modeling methodologies adept at handling complexity and scalability is ***,industrial systems are no longer quiescent,thus the intelligent operations of the systems should be dynamically specified in the *** this paper,the composition of the subsystem behaviors is studied to generate the complexity and scalability of the global system model,and a Boolean semantic specifying algorithm is proposed for generating dynamic intelligent operations in the *** traditional modeling approaches,the change or addition of specifications always necessitates the complete resubmission of the system model,a resource-consuming and error-prone *** with traditional approaches,our approach has three remarkable advantages:(i)an established Boolean semantic can be fitful for all kinds of systems;(ii)there is no need to resubmit the system model whenever there is a change or addition of the operations;(iii)multiple specifying tasks can be easily achieved by continuously adding a new ***,this general modeling approach has wide potential for future complex and intelligent industrial systems.

关键词： industrial complex system operation specifying Boolean semantic discrete event system(DES)theory intelligent operation

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