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Comparison and integration of CuInGaSe and perovskite solar cells

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Journal of Energy Chemistry 2023年第3期78卷 463-475,I0013页

作者： Weiguang chi Sanjay k.Banerjee Microelectronics Research Center Department of Electrical and Computer EngineeringThe University of Texas at AustinAustinTexas 78758USA

The rapidly developing perovskite solar cells(PSCs) provide a new and promising choice of thin film solar cells due to their attractive *** the commercialized thin film solar cells,CuInGaSe(CIGS)cells demonstrate higher efficiency than amorphous Si photovoltaic devices and lower toxicity than CdTe ***,a wide variety of studies have been conducted on ***,we elucidate CIGS materials and perovskites as absorber in thin film solar cells in terms of structure and optoelectronic ***,a comparison of PSCs and commercialized CIGS cells is made from the point of view of fabrication process,stability,and *** addition,the integration of CIGS devices and PSCs is elaborated based on tandem ***,prospects for the advancement of CIGS cells and PSCs are discussed.

关键词： CuInGaSe solar cells Perovskite solar cells Process Stability Toxicity Tandem

On complete and micropolar-based incomplete strain gradient theories for periodic lattice structures

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Applied Mathematics and Mechanics(English Edition) 2023年第10期44卷 1651-1674页

作者： Zeyang chi Jinxing LIU A.k.SOH Faculty of Civil Engineering and Mechanics Jiangsu UniversityZhenjiang 212013Jiangsu ProvinceChina School of Engineering Monash University MalaysiaJalan Lagoon SelatanBandar SunwaySelangor Darul Ehsan 47500Malaysia

The micropolar(MP) and strain gradient(SG) continua have been generally adopted to investigate the relations between the macroscopic elastic constants and the microstructural geometric parameters. Owing to the fact that the microrotation in the MP theory can be expressed in terms of the displacement gradient components, we may regard the MP theory as a particular incomplete SG theory called the MPSG theory,compared with the existing SG theories which are deemed complete since all the SGs are included. Taking the triangular lattice comprising zigzag beams as an example, it is found that as the angle of the zigzag beams increases, the bending of the beams plays a more important role in the total strain energy, and the difference between the results by the two theories gradually decreases. Finally, the models are verified with the pure bending and simple shear of lattices by comparing with the results obtained by the finite element method(FEM)-based structure analyses.

关键词： periodic lattice metamaterial energy principle homogenization micropolar(MP) strain gradient(SG)theory

Efficient Routing Strategy with Memory Information for Complex Networks

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American Journal of Operations Research 2012年第1期2卷 73-81页

作者： Takayuki kimura Tohru Ikeguchi chi k. tse Department of Electrical and Electronic Engineering Nippon Institute of Technology Saitama Japan Department of Electronic and Information Engineering Hong Kong Polytechnic University Hong Kong China Graduate School of Science and Engineering and Saitama University Brain Science Institute Saitama University Saitama Japan

In this paper, we propose a new packet routing strategy that incorporates memory information for reducing congestion in communication networks. First, we study the conventional routing strategy which selects the paths for transmitting packets to destinations using the distance information and the dynamical information such as the number of accumulating packets at adjacent nodes. Then, we evaluate the effectiveness of this routing strategy for the scale-free networks. From results of numerical simulations, we conclude that this routing strategy is not effective when the density of the packets increases due to the impermeability of the communication network. To avoid this undesirable problem, we incorporate memory information to the routing strategy. By using memory information effectively, packets are spread into the communication networks, achieving a higher performance than conventional routing strategies for various network topologies, such as scale-free networks, small-world networks, and scale-free networks with community structures.

关键词： Congestion Control Packet Routing Problems Decentralized Control Complex Networks

Solvent-Free Manufacturing of Lithium-Ion Battery Electrodes via Cold Plasma

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Energy & Environmental Materials 2024年第1期7卷 28-33页

作者： Zhiming Liang Tianyi Li Holden chi Joseph Ziegelbauer kai Sun Ming Wang Wei Zhang Tuo Liu Yang-tse Cheng Zonghai Chen Xiaohong Gayden Chunmei Ban Paul M.Rady Department of Mechanical Engineering University of Colorado BoulderBoulder CO 80309USA Advanced Photon Source Argonne National LaboratoryLemont IL 60439USA Intecells Inc. Southfield MI 48084USA Department of Materials Science and Engineering Michigan Center for Materials CharacterizationUniversity of MichiganAnn Arbor MI 48109USA Department of Chemical and Materials Engineering University of KentuckyLexington KY 40506USA Department of Chemistry University of KentuckyLexington KY 40506USA Chemical Sciences and Engineering Division Argonne National LaboratoryLemont IL 60439USA

Slurry casting has been used to fabricate lithium-ion battery electrodes for decades,which involves toxic and expensive organic solvents followed by high-cost vacuum drying and electrode *** work presents a new manufacturing method using a nonthermal plasma to create inter-particle binding without using any polymeric binding materials,enabling solvent-free manufacturing electrodes with any electrochemistry of *** cold-plasma-coating technique enables fabricating electrodes with thickness(>200 pm),high mass loading(>30 mg cm^(-2)),high peel strength,and the ability to print lithium-ion batteries in an arbitrary *** crosscutting,chemistry agnostic,platform technology would increase energy density,eliminate the use of solvents,vacuum drying,and calendering processes during production,and reduce manufacturing cost for current and future cell ***,lithium iron phosphate and lithium cobalt oxide were used as examples to demonstrate the efficacy of the cold-plasma-coating *** is found that the mechanical peel strength of cold-plasma-coating-manufactured lithium iron phosphate is over an order of magnitude higher than that of slurry-casted lithium iron phosphate *** cells assembled with a graphite anode and the cold-plasma-coating-lithium iron phosphate cathode offer highly reversible cycling performance with a capacity retention of 81.6%over 500 *** the highly conductive cathode material lithium cobalt oxide,an areal capacity of 4.2 mAh cm^(-2)at 0.2 C is *** anticipate that this new,highly scalable manufacturing technique will redefine global lithium-ion battery manufacturing providing significantly reduced plant footprints and material costs.

关键词： cold plasma deposition lithium-ion battery solvent-free manufacturing

功率LED替代灯的新颖谐振式Buck镇流器

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电工技术学报 2012年第4期27卷 159-165页

作者：曲小慧 Siu Chung Wong chi kong tse 张建忠东南大学电气工程学院南京210096 香港理工大学电子及资讯工程学系中国香港

LED灯发光效率高,寿命长,因此具有巨大的应用前景,并有望取代白炽灯。LED灯是低压电流型器件,需要LED镇流器(驱动电路)将公共电网的高压交流电转换为适合LED的低压直流电。为了保证整个LED照明系统具有高效率和长寿命,LED镇流器必须具... 详细信息

LED灯发光效率高,寿命长,因此具有巨大的应用前景,并有望取代白炽灯。LED灯是低压电流型器件,需要LED镇流器(驱动电路)将公共电网的高压交流电转换为适合LED的低压直流电。为了保证整个LED照明系统具有高效率和长寿命,LED镇流器必须具有以上特性。相比于采用变压器降压,无变压器的降压变换器可以达到更高的效率,但此类变换器,如Buck变换器,在低占空比时要承受长时间的二极管续流,导通损耗大,效率低。因此,本文提出一种新颖的谐振式Buck镇流器,利用谐振可实现高电压转换比,转换效率高,工作时间长,且可以与已有的白炽灯调光器配合工作,可直接安装在白炽灯具上。实验结果证明了该镇流器的有效性,且成本低,适合于目前LED替代灯场合。

关键词： LED镇流器无变压器型变换器谐振式 LED替代灯

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基于LCLC恒流网络的LED自均流电路

中国电机工程学报 2016年第2期36卷 516-523页

作者：唐亚鹏曲小慧韩洪豆 Siu-Chung Wong chi kong tse 东南大学电气工程学院江苏省南京市210096 香港理工大学电子及资讯工程学系

多路半导体发光二极管(light-emitting-diode,LED)并联会造成导通电流不均衡,而电容均流方案由于其简单可靠得到广泛应用。为输出所需的LED电流,电容均流方案采用变频控制会引入无功环流,提高器件应力,而采用定频占空比控制时,变化的LE... 详细信息

多路半导体发光二极管(light-emitting-diode,LED)并联会造成导通电流不均衡,而电容均流方案由于其简单可靠得到广泛应用。为输出所需的LED电流,电容均流方案采用变频控制会引入无功环流,提高器件应力,而采用定频占空比控制时,变化的LED负载难以保证零电压开关(zerovoltage switching,ZVS)的实现。针对此问题,文中提出一种基于LCLC谐振网络的恒流源输出LED驱动电路,可有效解耦负载对输出电流的影响,定频控制,且同时实现输入阻抗为纯阻性,避免无功环流。该谐振网络亦结合电容均流方案,采用较少的器件实现多路均流。此外,该电路具有短路自保护功能,易于实现脉宽调制(pulse width modulation,PWM)调光。最后,以4条LED支路为例,搭建实验样机,实验结果证明该电路的有效性。

关键词： LED驱动电路均流谐振网络阻性输入阻抗

Intermittency in Switching Power Converters:Theoretical Analysis

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Frontiers of Electrical and Electronic Engineering in china 2006年第1期1卷 92-98页

作者： ZHOU Yu-fei CHEN Jun-ning tse chi k QIU Shui-sheng kE Dao-ming SHI Long-xing SUN Wei-feng Department of Electronic Engineering Anhui UniversityHefei 230039China Department of Electronic and Information Engineering The Hongkong Polytechnic UniversityKowloonHong KongChina School of Electronic and Information Engineering South China University of TechnologyGuangzhouGuangdong ProvinceChina Department of Electronic Engineering Southeast UniversityNanjingChina

In view of reasonable explanation of intermittent subharmonics and chaos that can be gained from coupling filter between circuits,this paper discusses a method that maps time bifurcation with parameter *** on this mapping method,the general analysis method of characteristic multiplier,which is originally aimed at parameter bifurcation,can be used for the study of intermittency,i.e.,time *** this paper,all researches coming from characteristic multipliers,parameter-bifurcation diagrams,and the largest Lyapunov exponent indicate the same results as those produced by simulation and ***,it is proved theoretically that the intermittency in switching power converter can be explained in terms of coupling of spurious interference.

关键词： switching power converters time bifurcation parameter bifurcation chaos subharmonics intermittency

A Tree-Based Data Collecting Network Structure for Wireless Sensor Networks

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Journal of Electronic Science and Technology of china 2008年第3期6卷 274-278页

作者： chi-Tsun Cheng chi k. tse Francis C. M. Lau the Department of Electronic and Information Engineering The Hong Kong Polytechnic University Kowloon Hong Kong

In a sensor network with a large number of densely populated sensor nodes, a single target of interest may be detected by multiple sensor nodes simultaneously. Data collected from the sensor nodes are usually highly correlated, and hence energy saving using in-network data fusion becomes possible. A traditional data fusion scheme starts with dividing the network into clusters, followed by electing a sensor node as cluster head in each cluster. A cluster head is responsible for collecting data from all its cluster members, performing data fusion on these data and transmitting the fused data to the base station. Assuming that a sensor node is only capable of handling a single node-to-node transmission at a time and each transmission takes T time-slots, a cluster head with n cluster members will take at least nT time-slots to collect data from all its cluster members. In this paper, a tree-based network structure and its formation algorithms are proposed. Simulation results show that the proposed network structure can greatly reduce the delay in data collection.

关键词： Cluster data transmission network structure sensor network trees

TRISim:A Triage Simulation System to Exploit and Assess Triage Operations for Hospital Managers-Development,Validation and Experiment

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Computer Modeling in Engineering & Sciences 2017年第2期113卷 117-149页

作者： A.koba yashi k.Suginuma M.Furui chi Graduate School of Industrial Technology Nihon University College of Industrial Technology Nihon University

Triage is a method for determining the priority of patients’treatment to improve survival *** triage methods are used in hospitals,and they are applied after performing an evaluation based on standard methods such as the Japan Triage Acuity Scale(JTAS)or Emergency Severity Index(ESI).It is important to consider the characteristics of all the hospitals when assigning triage methods and emergency levels to them;the hospital managers make these *** propose a multi-agent simulation method to support the hospital managers in employing the triage protocols according to their *** developed a prototype simulation system called TRISim to explore and assess the triage *** this paper,we provide an overview of TRISim and present our experimental results to validate the system.

关键词： Multi-agent simulation MAS triage simulation JTAS ESI MTS emergency department