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The Research of Connection between Degree of Polymerization and Frequency Domain Dielectric Spectroscopy Characteristics during Oil-Paper Insulation Aging

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Energy and Power engineering 2017年第4期9卷 667-674页

作者： Danyu Jiang Guangning Wu Xian Yang Qingkai Hao ASchool of Electrical engineering College Southwest Jiaotong University Chengdu China Electric Power Research Institute of guangdong Power Grid corporation Guangzhou China

In order to study the linkage effects between degree of polymerization and frequency domain dielectric spectroscopy characteristics of oil-paper insulation, the frequency domain dielectric response test platform of oil-paper insulation is set up. Complex permittivity of oil-paper insulation respectively composed by new or aged oil and insulation paper with different DP are tested, and complex permittivity of oil-paper insulation respectively composed by insulation respectively composed by new oil and insulation paper with different DP and low or high moisture content are tested. The test results are analyzed, and the analysis results show that the degree of polymerization of insulation paper has an influence on complex permittivity of oil-paper insulation though influencing the distribution of moisture and acids between oil and paper.

关键词： Degree of Polymerization Oil-Paper Insulation Frequency Domain Dielectric Spectroscopy Moisture

Cyclic test and numerical study of seismic performance of precast segmental concrete double-columns

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Journal of Central South University 2022年第8期29卷 2502-2512页

作者： ZOU Shuang WENLIUHAN Hei-sha MAO Yong-ping YU Bi-peng ZHANG Chong-bin Earthquake engineering Research&Test Center Guangzhou UniversityGuangzhou 510405China Key Laboratory of Earthquake engineering and Applied technology in guangdong Province Guangzhou 510405China Jianhua Building Materials(guangdong)Sales Co. Ltd.Guangzhou 510403China China Railway engineering Design and Consulting Group Co. Ltd.Beijing 100055China

The comparative research on the seismic performance of grouted sleeve connected pier(GS)and prestressed precast segmental concrete pier(PC)is mostly carried out by numerical *** this study,the GS pier and the PC pier of the new railway project from Hetian to Ruoqiang are taken into *** kinds of 1/5-scale assembled double-column specimens are made,and the quasi-static tests are carried *** overall seismic performance of the two spliced piers is studied,and compared in terms of failure mechanism,bearing capacity,ductility,stiffness and energy dissipation *** results show that the failure modes of both GS pier and PC pier are characterized by ***,the specific failure location and form are *** GS pier presents a complete hysteretic curve,large equivalent stiffness and strong energy dissipation *** hysteretic area of the PC pier is ***,it has good self-reset ability and quasi-static residual *** element models are set up using DispBeamColumn fiber elements and ZeroLength *** models that are calibrated with the test data can effectively simulate the damage development under monotonic *** load−displacement curves are in good agreement with the backbone curves of the test results.

关键词： pseudo static test seismic performance prestressed precast segmental concrete double-column piers steel sleeve connection precast concrete prestressed steel

Recursive Integral with Fuzzy Control Method used in Shunt Hybrid Active Power Filter

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Recursive Integral with Fuzzy Control Method used in Shunt H...

Plain metallic biomaterials:opportunities and challenges

2012 International Conference on Future Energy,Environment,and Materials

作者： Wei Zhao Ruimin Chen An Luo Electric Power Research Institute of guangdong Power Grid corporation College of Electrical and Information engineering Hunan University

A current control method for a shunt hybrid active power filter（HAPF） using recursive integral algorithm is presented in this paper. The method improves performance of the HAPF system by reducing the influence of detection accuracy, time delay of instruction current calculation and phase displacement of output filter. Fuzzy logic based set-point weighing algorithm is combined in the control scheme to enhance its robustness and anti-interference ability. The proposed algorithm is easy for engineering application and has small computation capacity. Experiment results have verified the validity of the proposed controller. Furthermore the proposed recursive integral PI algorithm can also be applied in the control of periodic current as in AC drivers.

关键词： harmonic suppression reactive power compensation recursive integral PI fuzzy inference

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Regenerative Biomaterials 2023年第1期10卷 140-147页

作者： Jiazhen Zhang Bao Zhai Jintao Gao Zheng Li Yufeng Zheng Minglong Ma Yongjun Li Kui Zhang Yajuan Guo Xinli Shi Bin Liu Guobiao Gao Lei Sun Center for Medical Device Evaluation National Medical Product AdministrationBeijing 100081China guangdong-Hong Kong-Macao Greater Bay Area Center for Medical Device Evaluation and Inspection of NMPAShenzhen 518045China School of Materials Science and engineering Peking UniversityBeijing 100871China State Key Laboratory of Nonferrous Metals and Process GRINM Group Corporation Limited(General Research Institute for Nonferrous Metals)Beijing 100088China

The‘plainification of materials’has been conceptualized to promote the sustainable development of *** perspective,for the first time in the field of biomaterials,proposes and defines‘plain metallic biomaterials(PMBs)’with demonstrated research and application case studies of pure titanium with high strength and toughness,and biodegradable,fine-grained and high-purity ***,after discussing the features,benefits and opportunities of PMBs,the challenges are analyzed from both technical and regulatory *** perspectives on PMB-based medical devices are also provided for the benefit of future research,development and commercialization.

关键词： plainification metallic biomaterials regulatory science medical devices pure titanium high-purity magnesium

Recent Advances in Data-Driven Wireless Communication Using Gaussian Processes: A Comprehensive Survey

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China Communications 2022年第1期19卷 218-237页

作者： Kai Chen Qinglei Kong Yijue Dai Yue Xu Feng Yin Lexi Xu Shuguang Cui School of Science and engineering The Chinese University of Hong KongShenzhen 518172China Future Network of Intelligence Institute(FNii) The Chinese University of Hong KongShenzhen 518172China School of Information Science and technology University of Science and Technology of ChinaHefei 230026China Research Institute China United Network Communications CorporationBeijing 100048China Alibaba Group Hangzhou 310052China

Data-driven paradigms are well-known and salient demands of future wireless communication. Empowered by big data and machine learning techniques,next-generation data-driven communication systems will be intelligent with unique characteristics of expressiveness, scalability, interpretability, and uncertainty awareness, which can confidently involve diversified latent demands and personalized services in the foreseeable future. In this paper, we review a promising family of nonparametric Bayesian machine learning models,i.e., Gaussian processes(GPs), and their applications in wireless communication. Since GP models demonstrate outstanding expressive and interpretable learning ability with uncertainty, they are particularly suitable for wireless communication. Moreover, they provide a natural framework for collaborating data and empirical models(DEM). Specifically, we first envision three-level motivations of data-driven wireless communication using GP models. Then, we present the background of the GPs in terms of covariance structure and model inference. The expressiveness of the GP model using various interpretable kernels, including stationary, non-stationary, deep and multi-task kernels,is showcased. Furthermore, we review the distributed GP models with promising scalability, which is suitable for applications in wireless networks with a large number of distributed edge devices. Finally, we list representative solutions and promising techniques that adopt GP models in various wireless communication applications.

关键词： wireless communication Gaussian process machine learning kernel interpretability uncertainty

Polarization-controlled dual resonant lattice Kerker effects

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Nano Research 2023年第2期16卷 3195-3200页

作者： Lei Xiong Xueqian Zhao Xiang Du Shuai Chen Yuanfu Lu Hongwei Ding Guangyuan Li School of Information Science and engineering Yunnan UniversityKunming 650500China CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China School of Computer Electronic and InformationGuangxi UniversityNanning 530004China College of Physics and Electronic technology Anhui Normal UniversityWuhu 241000China Tianjin H-Chip technology Group corporation Tianjin 300467China SIAT Branch Shenzhen Institute of Artificial Intelligence and Robotics for SocietyShenzhen 518055China

The generalized Kerker effects have attracted increasing interests in recent years due to their abilities to manipulate the far-field properties of ***,the dual-polarized generalized Kerker effect enabling different tailoring of orthogonally-polarized electromagnetic waves has not yet been ***,we demonstrate polarization-controlled dual resonant lattice Kerker effects in periodic silicon *** varying the incident angle,the electric dipole and magnetic dipole surface lattice resonances can spectrally overlap,causing zero reflectance and unitary transmittance,i.e.,the resonant lattice Kerker *** incident angle for achieving this effect can be tuned differently for s-and p-polarizations over large regions by varying the nanodisk size or the lattice *** proposed dual-polarized resonant lattice Kerker effects open up avenues for polarization-controlled manipulation of the phase and wavefront of light with metasurfaces.

关键词： Kerker effect surface lattice resonances dual-polarized silicon metasurface

DESIGN OF DATA CENTER’S HIGH RELIABILITY IN LARGE AGRICULTURAL ENTERPRISE

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DESIGN OF DATA CENTER’S HIGH RELIABILITY IN LARGE AGRICULTU...

Effect of Atmosphere on Volatile Emission Characteristic in Oxy-Fuel Combustion

Computer and Computing Technologies in Agriculture——First IFIP TC 12 International Conference(CCTA2007) Volume I

作者： Hanxing Liu Yingjie Kuang Caixing Liu Lei Xiao Guomao Xu Department of Computer Science and engineering South China Agricultural University Informatics Center Guangdong Wen's Food Corporation

It’s necessary for the large agricultural enterprise to construct a stabile and reliable network environment and a powerful Data *** this paper,the constructing of high reliability in Data Center will be discussed according to the requirements of large agricultural enterprise;an effective solution will be presented that adopts structural redundancy and double VPN in the aspect of network and *** solution has been carried out effectively in practical application,and proved that it is an exercisable example for the constructing of Data Center in large agricultural enterprise.

关键词： large agricultural enterprise data center high reliability

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Energy and Power engineering 2013年第2期5卷 135-139页

作者： Le Wu Shihe Chen Jia Luo Electric Power Research Institute of guangdong Power Grid corporation Guangzhou China

A new type of power supply which was called oxy-fuel combustion power plant was introduced to reduce greenhouse gasses emission. In this paper the volatile emission characteristic of pulverized coal is studied under air atmosphere and oxy-fuel atmosphere. Combustion experiments of Datong bituminous coal were carried out in a wire mesh reactor at heating rates of 1 K/s, 10 K/s and 1000 K/s respectively under air and O2/CO2 atmosphere conditions in order to investigate the volatile emission characteristic. The concentrations of volatile (mainly CO and CH4) emission were on-line measured by infrared gas analyzer. It was indicated that the concentrations of CO and CH4 in O2/CO2 atmosphere were higher than those in air. The direct oxidation of carbon and gasification reaction between carbon and CO2 are the main causes of the increased amount of CO. The higher concentration of CO2 also results in the increased amount of CH4 in O2/CO2 conditions.

关键词： Oxy-Fuel Combustion O2/CO2 Atmosphere Volatile Emission Gasification Reaction

On the accurate characterization of quantum-dot light-emitting diodes for display applications

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npj Flexible Electronics 2022年第1期6卷 351-362页

作者： Wangxiao Jin Yunzhou Deng Bingbing Guo Yaxiao Lian Baodan Zhao Dawei Di Xiaowei Sun Kai Wang Shuming Chen Yixing Yang Weiran Cao Song Chen Wenyu Ji Xuyong Yang Yuan Gao Shuangpeng Wang Huaibin Shen Jialong Zhao Lei Qian Fushan Li Yizheng Jin Key Laboratory of Excited-State Materials of Zhejiang Province State Key Laboratory of Silicon MaterialsDepartment of ChemistryZhejiang University310027 HangzhouChina State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University310027 HangzhouChina Department of Electronic and Electrical engineering Southern University of Science and Technology518055 ShenzhenChina TCL Research ShenzhenGuangdongChina Shenzhen China Star Optoelectronics Semiconductor Display technology Co. LtdShenzhenGuangdongChina College of Chemistry Chemical Engineering and Materials ScienceSoochow University199 Ren’ai Rd215123 SuzhouJiangsuChina Key Lab of Physics and technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin University130023 ChangchunChina Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University149 Yanchang RoadShanghai 200072China Najing technology corporation Ltd Hangzhou 310052China Institute of Applied Physics and Materials engineering University of MacaoTaipaMacaoSAR 999078China Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China School of Physical Science and technology MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and MaterialsGuangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Physics and Information engineering Fuzhou UniversityFuzhou 350108China

Quantum dot light-emitting diodes(QLEDs)are a class of high-performance solution-processed electroluminescent(EL)devices highly attractive for next-generation display *** the encouraging advances in the mechanism investigation,material chemistry,and device engineering of QLEDs,the lack of standard protocols for the characterization of QLEDs may cause inaccurate measurements of device parameters and invalid comparison of different ***,we report a comprehensive study on the characterizations of QLEDs using various *** show that the emission non-uniformity across the active area,nonLambertian angular distributions of EL intensity,and discrepancies in the adopted spectral luminous efficiency functions could introduce significant errors in the device *** errors in the operational-lifetime measurements may arise from the inaccurate determination of the initial luminance and inconsistent methods for analyzing the luminance-decay ***,we suggest a set of recommended practices and a checklist for device characterizations,aiming to help the researchers in the QLED field to achieve accurate and reliable measurements.

关键词： diodes characterization luminous