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Terahertz metadevices for silicon plasmonics

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Chip 2022年第4期1卷 37-65页

作者： Yuan Liang Hao Yu Hong Wang Hao Chi Zhang Tie Jun Cui Southern University of Science and technology(SUSTech) and the Engineer-ing Research Center of Integrated Circuits for Next-Generation Communica-tionsMinistry of EducationSouthern University of Science and TechnologyShenzhen 518055China Department of Materials Science and engineering&Shenzhen engineering research center for Novel Electronic Information Ma-terials and Devices Southern University of Science and TechnologyShenzhenChina State Key Laboratory of Millimeter Waves and Institute of Electromag-netic Space Southeast UniversityNanjing 210096China

Metamaterial devices(metadevices)have been developed in progress aiming to generate extraordinary performance over traditional de-vices in the(sub-)terahertz(THz)domain,and their planar integra-tion with complementary-metal-oxide-semiconductor(CMOS)cir-cuits pave a new way to build miniature silicon plasmonics that over-comes existing challenges in chip-to-chip *** an effort towards low-power,crosstalk-tolerance,and high-speed data link for future exascale data centers,this article reviews the recent progress on two metamaterials,namely,the spoof surface plasmon polaritons(SPPs),and the split-ring resonator(SRR),as well as their imple-mentations in silicon,focusing primarily on their fundamental the-ories,design methods,and implementations for future THz *** to their respective dispersion characteristic at THz,these two metadevices are highly expected to play an important role in miniature integrated circuits and systems toward compact size,dense integration,and outstanding performance.A design example of a fully integrated sub-THz CMOS silicon plasmonic system integrating these two metadevices is provided to demonstrate a dual-channel crosstalk-tolerance and energy-efficient on-off keying(OOK)communication *** directions and potential applications for THz metade-vices are discussed.

关键词： CMOS I/O transceiver Channel crosstalk Metamaterial Metawaveguide Spoof surface plasmon polaritons Split-ring resonator Terahertz transmission line Interconnect

Cloud-Data Envelopment Analysis Method Used for Assessment of Restoration Building Block Schemes

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CSEE Journal of power and energy systems 2015年第2期1卷 43-52页

作者： Yun Zhou Zheng Yan Naihu Li Lingfeng Yu Lingfeng Zhou Lixia Chen Key Laboratory of Control of power transmission and Conversion Ministry of EducationDepartment of Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Alstom Grid China technology center(CTC) Shanghai 201114China

The selection of an optimized restoration building block(RBB)scheme among all available schemes is one of the most important factors impacting the power system restoration process after a complete or partial *** paper presents a data envelopment analysis(DEA)model used as an empirical method to assess the RBB *** N-level evaluation scale cloud system is built based on cloud theory to transform qualitative I/O indices of DEA model into quantitative *** joint utilization of the CCR(Charnes,Cooper and Rhodes)model and the LJK(Li,Jahanshahloo and Khodabakhshi)model,the established Joint-DEA model makes the newly proposed Cloud-DEA method a more feasible and robust method in assessment of RBB schemes.

关键词： Assessment model cloud theory date envelopment analysis(DEA) restoration building block(RBB)schemes

research on hybrid multi-terminal high-voltage DC technology for offshore wind farm integration

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Journal of Modern power systems and Clean energy 2013年第1期1卷 34-41页

作者： Peng ZHAN Chenghao LI Jinyu WEN Yu HUA Meiqi YAO Naihu LI State Key Laboratory of Advanced Electromagnetic engineering and technology Huazhong University of Science and TechnologyWuhan 430074Chin Grid technology center(China)Co.Ltd. Shanghai 201114China

Multi-terminal high-voltage DC(MTDC)technology is a promising way to transmit large amounts of offshore wind power to the main *** paper proposes a hybrid MTDC scheme to integrate several offshore wind farms into the onshore power grids at different locations.A hybrid four-terminal HVDC system comprising two onshore line commutated converters(LCCs)and two voltage source converters(VSCs)connecting an offshore wind farm is constructed in PSCAD/EMTDC.A coordination control scheme based on the VSCs’AC voltage control and the LCCs’DC voltage droop control is designed to ensure smooth system operation and proper power sharing between onshore AC *** operational characteristics of the system are *** addition,a black start-up method without any auxiliary power supply for the VSCs is *** transmission scheme is tested through simulations under various conditions,including start-up,wind speed variation,and the disconnection of one VSC or of one LCC.

关键词： Hybrid multi-terminal HVDC Offshore wind farm Droop control Voltage source converter Line commutated converter

Online Computation Offloading and Trajectory Scheduling for UAV-Enabled Wireless powered Mobile Edge Computing

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China Communications 2022年第4期19卷 257-273页

作者： Han Hu Xiang Zhou Qun Wang Rose Qingyang Hu The Jiangsu Key Laboratory of Wireless Communications Nanjing University of Posts and TelecommunicationsNanjing 210003China The engineering research center of Health Service system Based on Ubiquitous Wireless Networks Ministry of EducationNanjing University of Posts and TelecommunicationsNanjing 210003China The Department of Electrical and Computer engineering Utah State UniversityLoganUTUSA.

The unmanned aerial vehicle(UAV)-enabled mobile edge computing(MEC) architecture is expected to be a powerful technique to facilitate 5 G and beyond ubiquitous wireless connectivity and diverse vertical applications and services, anytime and anywhere. Wireless power transfer(WPT) is another promising technology to prolong the operation time of low-power wireless devices in the era of Internet of Things(IoT). However, the integration of WPT and UAV-enabled MEC systems is far from being well studied, especially in dynamic environments. In order to tackle this issue, this paper aims to investigate the stochastic computation offloading and trajectory scheduling for the UAV-enabled wireless powered MEC system. A UAV offers both RF wireless power transmission and computation services for IoT devices. Considering the stochastic task arrivals and random channel conditions, a long-term average energyefficiency(EE) minimization problem is *** to non-convexity and the time domain coupling of the variables in the formulated problem, a lowcomplexity online computation offloading and trajectory scheduling algorithm(OCOTSA) is proposed by exploiting Lyapunov optimization. Simulation results verify that there exists a balance between EE and the service delay, and demonstrate that the system EE performance obtained by the proposed scheme outperforms other benchmark schemes.

关键词： energy efficiency mobile edge computing UAV-enabled wireless power transfer trajectorys cheduling

energy-efficient power allocation for selfish cooperative communication networks using bargaining game

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Science China(Information Sciences) 2012年第4期55卷 795-804页

作者： DING EnJie 1,ZHANG GuoPeng 1,LIU Peng 1 & YANG Kun 2 1 CUMT-IoT Perception Mine research center,China University of Mining and technology,Xuzhou 221116,China 2 School of Computer Science and Electronic engineering,University of Essex Wivenhoe Park,Colchester Essex,CO4 3SQ,UK CUMT-IoT Perception Mine research center China University of Mining and Technology Xuzhou China School of Computer Science and Electronic engineering University of Essex Wivenhoe Park Colchester Essex UK

In commercial networks,user nodes operating on batteries are assumed to be selfish to consume their energy solely to maximize their own benefits,e.g.,data *** this paper,we propose a bargaining game to perform the power allocation for the selfish cooperative communication *** our system,two partner nodes can act as a source as well as a relay for each other,and each node is with an energy constraint to transmit one *** a selfish node is willing to seek cooperative transmission only if the data rate achieved through cooperation will not lower than that achieved through noncooperation by using the same amount of *** energy-efficient power allocation problem can be modeled as a cooperative *** proved that there exists a unique Nash bargaining solution (NBS) for the game by verifying that the game is indeed a bargaining ***,the two objectives,i.e.,system efficiency and user fairness specified in the selfish networks can be *** results show that the NBS scheme is efficient in that the performance loss of the NBS scheme to that of the maximal overall rate scheme is small while the maximal-rate scheme is *** simulation results also show that the NBS result is fair in that both nodes could experience better performance than they work independently and the degree of cooperation of a node only depends on how much contribution its partner can make to improve its own performance.

关键词： cooperative communication energy efficiency resource allocation cooperative game theory Nash bargaining solution

Electronictization-A Foundation for Grid Modernization

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Chinese Journal of Electrical engineering 2015年第1期1卷 1-8页

作者： Don Tan IEEE power Electronics Society New JerseyUSA

Smart grid is the flag under which the US DoE has been mobilizing efforts to modernize the *** is the first step towards a smart modern *** is a process that transforms the grid from electrical and electromechanical(EE)to electronic,electrical and electromechanical(EEE),laying down the very basic foundation for the modern *** things grid connected(ATGC)has five groups of essential hardware:1)Grid interface(smart)inverters;2)Hardware for flexible AC transmissions;3)Intelligent electronic power transformers(grid scale);4)Solid-state circuit breaker,current limiters,smart fuses and sensors;and 5)Multi-port bidirectional power&control *** and deployment of ATGC will be a grassroots drive to transform the grid from an old passive technology to a new active technology based on electronic power transmission,distribution,processing and *** modernization represents a win-win-win situation for the environment(Government),consumers,and grid owners/operators.

关键词： Grid modernization electronictization fractal grid structure energy system resiliency fault management fault isolation renewable energy integration all things grid connected

Synthesis of Mg-K-biochar bimetallic catalyst and its evaluation of glucose isomerization

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Biochar 2023年第1期5卷 976-992页

作者： Xiheng Kang Zi You Jian Peng Arthur J.Ragauskas Jingdong Pang Peitao Zhao Yongjun Yin Xueping Song Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control College of Light Industry and Food EngineeringGuangxi UniversityNanning 530004People’s Republic of China Department of Chemical and Biomolecular engineering University of TennesseeKnoxvilleTNUSA Oak Ridge National Laboratory Biosciences DivisionJoint Institute for Biological SciencesOak RidgeTNUSA center for Renewable Carbon Department of ForestryWildlife and FisheriesThe University of TennesseeKnoxvilleTN 37996USA School of Electrical and power engineering China University of Mining and TechnologyXuzhou 221116People’s Republic of China China CAMC engineering CO. LTD.SINOMACH PlazaNo.3Danling StreetBeijing 100080People’s Republic of China

Highly efficient isomerization of glucose to fructose is essential for valorizing cellulose fraction of biomass to valueadded *** work provided an innovative method for preparing Mg-biochar and Mg-K-biochar catalysts by impregnating either MgCl_(2) alone or in combination with different K compounds(Ding et *** Bioresour Technol 341:125835,2021,https://***/10.1016/*** ech.2021.125835 and KHCO_(3))on cellulose-derived biochar,followed by hydrothermal carbonization and *** active substance MgO existing in the _(10)Mg-C could give better catalytic effect on glucose isomerization than the synergy of MgO and KCl crystalline material present in _(10)*** the catalytic effect of _(10)Mg-C was decreased when the basic site of MgO was *** to other carbon-based metal catalysts,_(10)Mg-KHCO_(3)-C with 10 wt%MgCl_(2) loading had excellent catalytic performance,which gave a higher fructose yield(36.7%)and selectivity(74.54%),and catalyzed excellent glucose conversion(53.99%)at 100°C in 30 *** electron microscope-energy dispersive spectrometer and X-Ray diffraction revealed that the distribution of Mg^(Mg^(2+))and K^(+)in _(10)Mg-KHCO_(3)-C was uniform and the catalytic active substances(MgO,KCl and K_(2)CO_(3))were more than _(10)Mg-C(only MgO).The synergy effects of MgO and K_(2)CO_(3) active sites enhanced the pH of reaction system and induced H2O ionization to form considerable OH−ions,thus easily realizing a deprotonation of glucose and effectively catalyzing the isomerization of *** this study,we developed a highly efficient Mg-K-biochar bimetallic catalyst for glucose isomerization and provided an efficient method for cellulose valorization.

关键词： Isomerization Catalyst Fructose Biochar MgO

A Nonresonant Hybridized Electromagnetic-Triboelectric Nanogenerator for Irregular and Ultralow Frequency Blue energy Harvesting

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research 2021年第1期2021卷 304-315页

作者： Weibo Xie Lingxiao Gao Lingke Wu Xin Chen Fayang Wang Daqiao Tong Jian Zhang Jianyu Lan Xiaobin He Xiaojing Mu Ya Yang State Key Laboratory of Mechanical transmissions Chongqing UniversityChongqing 400044China Key Laboratory of Optoelectronic technology&systems Ministry of Education International R&D Center of Micro-Nano Systems and New Materials TechnologyChongqing UniversityChongqing 400044China CAS center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100083China College of Aerospace engineering Chongqing UniversityChongqing 400044China Shanghai Academy of Spaceflight technology Shanghai Institute of Space Power SourceShanghai 200245China School of Nanoscience and technology University of Chinese Academy of SciencesBeijing 100049China center on Nanoenergy research School of Physical Science and TechnologyGuangxi UniversityNanningGuangxi 530004China

As a promising renewable energy source,it is a challenging task to obtain blue energy,which is irregular and has an ultralow frequency,due to the limitation of ***,a nonresonant hybridized electromagnetic-triboelectric nanogenerator was presented to efficiently obtain the ultralow frequency *** instrument adopted the flexible pendulum structure with a precise design and combined the working principle of electromagnetism and triboelectricity to realize the all-directional vibration energy acquisition *** results confirmed that the triboelectric nanogenerator(TENG)had the potential to deliver the maximum power point of about 470μW while the electromagnetic nanogenerator(EMG)can provide 523 mW at *** conversion efficiency of energy of the system reached 48.48%,which exhibited a remarkable improvement by about 2.96 times,due to the elastic buffering effect of the TENG with the double helix ***,its ability to collect low frequency wave energy was successfully proven by a buoy in Jialing *** woke provides an effective candidate to harvest irregular and ultralow frequency blue energy on a large scale.

关键词： generator precise instrument

Computation Rate Maximization in Multi-User Cooperation-Assisted Wireless-powered Mobile Edge Computing with OFDMA

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China Communications 2023年第1期20卷 218-229页

作者： Xinying Wu Yejun He Asad Saleem College of Electronics and Information engineering Shenzhen UniversityShenzhen 518060China Guangdong engineering research center of Base Station Antennas and Propagation Shenzhen Key Laboratory of Antennas and PropagationShenzhen 518060China

In the era of Internet of Things(Io T),mobile edge computing(MEC)and wireless power transfer(WPT)provide a prominent solution for computation-intensive applications to enhance computation capability and achieve sustainable energy supply.A wireless-powered mobile edge computing(WPMEC)system consisting of a hybrid access point(HAP)combined with MEC servers and many users is considered in this *** particular,a novel multiuser cooperation scheme based on orthogonal frequency division multiple access(OFDMA)is provided to improve the computation performance,where users can split the computation tasks into various parts for local computing,offloading to corresponding helper,and HAP for remote execution respectively with the aid of ***,we aim at maximizing the weighted sum computation rate(WSCR)by optimizing time assignment,computation-task allocation,and transmission power at the same time while keeping energy neutrality in *** transform the original non-convex optimization problem to a convex optimization problem and then obtain a semi-closed form expression of the optimal solution by considering the convex optimization *** results demonstrate that the proposed multi-user cooperationassisted WPMEC scheme greatly improves the WSCR of all users than the existing *** addition,OFDMA protocol increases the fairness and decreases delay among the users when compared to TDMA protocol.

关键词： mobile edge computing(MEC) wireless power transfer(WPT) user cooperation OFDMA convex optimization