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Achievable Rate Analysis and Optimization of Double-RIS Assisted Spatially Correlated MIMO with Statistical CSI

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China Communications 2025年第1期22卷 139-157页

作者： Xu Kaizhe Guo Jiajia Zhang Jun Jin Shi Ma Shaodan Department of Communications and Networking Xi’an Jiaotong-Liverpool UniversitySuzhou 215123China State Key Laboratory of internet of things for Smart City University of MacaoMacao SARChina Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and TelecommunicationsNanjing 210003China National Mobile Communications research Laboratory Southeast UniversityNanjing 210096China State Key Laboratory of internet of things for Smart City and the Department of Electrical and Computer engineering University of MacaoMacao SARChina

Reconfigurable intelligent surface(RIS)is a novel meta-material which can form a smart radio environment by dynamically altering reflection directions of the impinging electromagnetic *** the prior literature,the inter-RIS links which also contribute to the performance of the whole system are usually neglected when multiple RISs are *** this paper we investigate a general double-RIS assisted multiple-input multiple-output(MIMO)wireless communication system under spatially correlated non line-of-sight propagation channels,where the cooperation of the double RISs is also *** design objective is to maximize the achievable ergodic rate based on full statistical channel state information(CSI).Specifically,we firstly present a closedform asymptotic expression for the achievable ergodic rate by utilizing replica method from statistical *** a full statistical CSI-enabled optimal design is proposed which avoids high pilot training overhead compared to instantaneous CSI-enabled *** further reduce the signal processing overhead and lower the complexity for practical realization,a common-phase scheme is proposed to design the double *** results show that the derived asymptotic ergodic rate is quite accurate even for small-sized antenna *** the proposed optimization algorithm can achieve substantial gain at the expense of a low overhead and ***,the cooperative double-RIS assisted MIMO framework is proven to achieve superior ergodic rate performance and high communication reliability under harsh propagation environment.

关键词： common reflection pattern double RISs large system analysis MIMO replica method

A comprehensive review on rectification and power management strategies for triboelectric nanogenerators

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Science China Technological Sciences 2025年第03期68卷 5-33页

作者： Zhongjie LI Bingyan CUI Biao WANG Fan SHEN Hao WU Ying GONG Yan PENG Hengyu GUO Dan ZHANG Institute of Artificial Intelligence School of Future Technology Shanghai University School of Mechatronic engineering and Automation Shanghai University engineering research center of Unmanned intelligent Marine Equipment Shanghai University Department of Applied Physics Chongqing University

Nanogenerators utilize nanomaterials to harvest mechanical or thermal energy at the micro-nano scale, thereby providing power for small self-sustaining devices. Compared to traditional generators, nanogenerators offer advantages such as compact size, high flexibility, and broad versatility. Triboelectric nanogenerators(TENGs), based on triboelectric theory, can collect energy from mechanical sources such as vibrations or sliding movements. TENGs hold promise for powering small electronics. However, the high pulse characteristics of their output voltage prevent them from directly charging electronic devices. To address the requirements of the internet of things(IoTs), this paper comprehensively reviews state-of-the-art power management systems used to enhance the current stability and output power of TENGs. First, the working principle and resistive load output characteristics of TENGs are elaborated. Power management circuits(PMCs) based on full-wave rectifiers,half-wave rectifiers, and Bennet's doublers are subsequently analyzed and compared. Mechanical and electronic switches proposed to further improve rectifier performance are also detailed. Mechanical switches are categorized as travel and voltagetriggered switches, while electronic switches include silicon-controlled rectifiers(SCRs), metal-oxide-semiconductor fieldeffect transistors(MOSFETs), and integrated circuits. In conclusion, the characteristics and applications of PMCs are summarized, along with the identification of existing limitations in their application. Subsequently, appropriate solutions and prospects for further development are explored.

关键词： triboelectric nanogenerators power management circuit rectifier switch

Illuminating Growth:How Light Spectra Influence Juvenile Steelhead Trout(Oncorhynchus mykiss)Growth and Metabolism

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Journal of Ocean University of China 2025年第1期24卷 209-216页

作者： CHEN Xueweijie ZHOU Yangen HUANG Jinze AN Dong LI Li DONG Yunwei GAO Qinfeng DONG Shuanglin Key Laboratory of Mariculture Ministry of EducationOcean University of ChinaQingdao 266003China National Innovation center for Digital Fishery China Agricultural UniversityBeijing 100083China Key Laboratory of Smart Farming Technologies for Aquatic Animals and Livestock Ministry of Agriculture and Rural AffairsChina Agricultural UniversityBeijing 100083China Beijing engineering and technology research center for internet of things in Agriculture Beijing 100083China College of Information and Electrical engineering China Agricultural UniversityBeijing 100083China Function Laboratory for Marine Fisheries Science and Food Production Processes Laoshan LaboratoryQingdao 266237China

The diurnal variation in the sun's altitude alters the red-to-blue light spectrum ratio under identical water *** study explores how juvenile steelhead trout(Oncorhynchus mykiss)(initial weight:34.67 g±2.69 g)responds to these fluctuating light conditions,focusing on growth,daily activity levels,and energy *** 16 weeks,the experiment was conducted to examine six lighting scenarios:12 h white light followed by 12 h darkness(12W);12 h blue light followed by 12 h darkness(12B);12 h red light followed by 12 h darkness(12R);1.5 h blue light,9 h red light,and again 1.5 h blue light followed by 12 h darkness(3B9R);3 h blue light,6h red light,and again 3 h blue light followed by 12 h darkness(6B6R);and 12 h combined blue and red lights followed by 12 h darkness(T12BR).The findings reveal that the 3B9R lighting condition notably enhanced specific growth rate(SGR),feed conversion efficiency(FCE),and growth energy allocation,while diminishing daily activity levels in steelhead ***,under the 6B6R condition,there was a significant reduction in SGR and FCE,indicating that growth was *** the 12R condition,despite the high activity and respiratory energy loss,the trout exhibited improved SGR and FCE with reduced fecal energy *** study suggests that 3B9R and 12R lighting conditions might be beneficial in commercial steelhead trout farming,potentially lowering costs and boosting *** results offer valuable insights for the application of supplementary lighting technology in salmon aquaculture.

关键词： energy budget growth light color total daily activity steelhead trout

Fault-tolerant finite-time dynamical consensus of double-integrator multi-agent systems with partial agents subject to synchronous self-sensing function failure

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Chinese Physics B 2022年第12期31卷 719-725页

作者： Zhi-Hai Wu Lin-Bo Xie engineering research center of internet of things technology Applications of MOE School of Internet of Things EngineeringJiangnan UniversityWuxi 214122China

This paper investigates fault-tolerant finite-time dynamical consensus problems of double-integrator multi-agent systems(MASs)with partial agents subject to synchronous self-sensing function failure(SSFF).A strategy of recovering the connectivity of network topology among normal agents based on multi-hop communication and a fault-tolerant finitetime dynamical consensus protocol with time-varying gains are proposed to resist synchronous *** is proved that double-integrator MASs with partial agents subject to synchronous SSFF using the proposed strategy of network topology connectivity recovery and fault-tolerant finite-time dynamical consensus protocol with the proper time-varying gains can achieve finite-time dynamical *** simulations are given to illustrate the effectiveness of the theoretical results.

关键词： multi-agent systems synchronous self-sensing function failure finite-time dynamical consensus network topology connectivity recovery

Asymptotic bounded consensus tracking of double-integrator multi-agent systems with bounded-jerk target based on sampled-data without velocity measurements

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Chinese Physics B 2017年第1期26卷 591-596页

作者： Shuang-Shuang Wu Zhi-Hai Wu Li Peng Lin-Bo Xie engineering research center of lntemet of things technology Applications of the Ministry of Education School of Internet of Things Engineering Jiangnan University Wuxi 214122 China

This paper investigates asymptotic bounded consensus tracking（ABCT） of double-integrator multi-agent systems（MASs） with an asymptotically-unbounded-acceleration and bounded-jerk target（AUABJT） available to partial agents based on sampled-data without velocity measurements. A sampled-data consensus tracking protocol（CTP） without velocity measurements is proposed to guarantee that double-integrator MASs track an AUABJT available to only partial *** eigenvalue analysis method together with the augmented matrix method is used to obtain the necessary and sufficient conditions for ABCT. A numerical example is provided to illustrate the effectiveness of theoretical results.

关键词： asymptotic bounded consensus tracking multi-agent systems without velocity measurements sampled-data control

“Super-heterojunctioned” thermoelectric polymers

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Chinese Chemical Letters 2025年第2期36卷 32-33页

作者： Hanying Li Wee-Liat Ong MOE Key Laboratory of Macromolecular Synthesis and Functionalization International Research Center for X PolymersDepartment of Polymer Science and Engineering Zhejiang University ZJU-UIUC Institute College of Energy Engineering Zhejiang University

Given the increasing demand for distributed electricity, there is a burning desire to harvest electricity from renewable sources using environmentally friendly methods. Thermoelectric (TE) materials can meet this requirement not only because of their ability to convert heat directly into electricity, enabling energy harvesting from waste heat and natural heat resources, but also because more than 60%of the energy is lost as waste heat [1]. The discovery of the TE effect dates back to the 1820s when T. M. Seebeck observed electricity generation at the junction of two conductors with different temperatures. Additionally, when a voltage is applied to TE materials, they can create a temperature difference to enable solid-state cooling (known as the Peltier effect).Therefore, the TE effect promises both sustainable energy solutions and temperature control technologies. Over the past two decades,the urgent demand for powering ubiquitous internet of things devices has sparked significant interest in flexible thermoelectrics(F-TEs), which raises an intriguing question:Is the intrinsically flexible polymer an important candidate for state-of-the-art F-TEs applications?

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Fault-Tolerant Dynamical Consensus of Double-Integrator Multi-Agent Systems in the Presence of Asynchronous Self-Sensing Function Failures

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Journal of Shanghai Jiaotong university(Science) 2024年第4期29卷 613-624页

作者： WU Zhihai XIE Linbo engineering research center of internet of things technology Applications of the Ministry of Education School of Internet of Things EngineeringJiangnan UniversityWuxiJiangsu214122China

Double-integrator multi-agent systems(MASs)might not achieve dynamical consensus,even if only partial agents suffer from self-sensing function failures(SSFFs).SSFFs might be asynchronous in real engineering *** existing fault-tolerant dynamical consensus protocol suitable for synchronous SSFFs cannot be directly used to tackle fault-tolerant dynamical consensus of double-integrator MASs with partial agents subject to asynchronous *** by these facts,this paper explores a new fault-tolerant dynamical consensus protocol suitable for asynchronous ***,multi-hop communication together with the idea of treating asynchronous SSFFs as multiple piecewise synchronous SSFFs is used for recovering the connectivity of network topology among all normal ***,a fault-tolerant dynamical consensus protocol is designed for double-integrator MASs by utilizing the history information of an agent subject to SSFF for computing its own state information at the instants when its minimum-hop normal neighbor set ***,it is theoretically proved that if the strategy of network topology connectivity recovery and the fault-tolerant dynamical consensus protocol with proper time-varying gains are used simultaneously,double-integrator MASs with all normal agents and all agents subject to SSFFs can reach dynamical ***,comparison numerical simulations are given to illustrate the effectiveness of the theoretical results.

关键词： double-integrator multi-agent systems asynchronous self-sensing function failures fault-tolerant dynamical consensus network topology connectivity recovery

Over 200 times current enhancement via buckling triboelectric nanogenerator at ultra-low speed for monitoring the swelling of lithium ion batteries

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Science Bulletin 2025年第2期70卷 148-152页

作者： Maoyi Zhang Chaosheng Hu Tongtong Zhang Chris R.Bowen Rui Li YongAn Huang Yewang Su Zhong Lin Wang Ya Yang Beijing Key Laboratory of Micro-Nano Energy and Sensor Center for High-Entropy Energy and SystemsBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of engineering Science University of Chinese Academy of SciencesBeijing 100049China School of Nanoscience and technology University of Chinese Academy of SciencesBeijing 100049China Department of Mechanical engineering University of BathBath BA27AKUK State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024China State Key Laboratory of intelligent Manufacturing Equipment and technology Huazhong University of Science and TechnologyWuhan 430074China School of Material Science and engineering Georgia Institute of TechnologyAtlantaGA 30332-0245USA

Sensors deployed within the internet of things(Io T)require a stable and continuous electrical energy supply[1].The traditional approach to provide an energy supply relies primarily on battery power,which has specific shortcomings;these include integration difficulties,the need for frequent charging or replacement,and environmental pollution associated with battery production and *** solve the challenge of delivering an energy supply to sensors,researchers have designed self-powered sensors or have produced power for sensors by scavenging mechanical energy from the surrounding *** generators[2],piezoelectric generators[3]and triboelectric nanogenerators(TENGs)[4,5]are common approaches to scavenge mechanical *** have been widely used in the development of self-powered sensors and the supply of electrical energy to sensors due to their high performance,low cost,and wide range of potential materials[6].

关键词： battery buckling swelling

Design and investigation of novel ultra-high-voltage junction field-effect transistor embedded with NPN

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Chinese Physics B 2021年第7期30卷 619-623页

作者： Xi-Kun Feng Xiao-Feng Gu Qin-Ling Ma Yan-Ni Yang Hai-Lian Liang engineering research center of internet of things technology Applications(Ministry of Education) Department of Electronic EngineeringJiangnan UniversityWuxi 214122China

Ultra-high-voltage(UHV)junction field-effect transistors(JFETs)embedded separately with the lateral NPN(JFETLNPN),and the lateral and vertical NPN(JFET-LVNPN),are demonstrated experimentally for improving the electrostatic discharge(ESD)*** ESD characteristics show that both JFET-LNPN and JFET-LVNPN can pass the 5.5-k V human body model(HBM)*** JFETs embedded with different NPNs have 3.75 times stronger in ESD robustness than the conventional *** failure analysis of the devices is performed with scanning electron microscopy,and the obtained delayer images illustrate that the JFETs embedded with NPN transistors have good voltage endurance ***,the internal physical mechanism of the JFETs embedded with different NPNs is investigated with emission microscopy and Sentaurus simulation,and the results confirm that the JFET-LVNPN has stronger ESD robustness than the JFET-LNPN,because the vertical NPN has a better electron collecting *** JFET-LVNPN is helpful in providing a strong ESD protection and functions for a power device.

关键词： junction field-effect transistors NPN electrostatic discharge(ESD)robustness ESD protection