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Flexible and free-standing La_(0.33)Ti_(2)(PO_(4))_(3)/C nanofibers film as a novel high-performance anode for sodium-and potassium-ion batteries

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Rare Metals 2023年第10期42卷 3387-3398页

作者： Jing Dai Jian Jing Jian-Ping Yang Wen Zhang Shao-Xiong Liu qian-fu wang Jia-Xing Wen Hai Hu Hui-Fang Li Li Liu National Base for International Science&Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage BatteryKey Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of EducationHunan Province Key Laboratory of Electrochemical Energy Storage and ConversionSchool of ChemistryXiangtan UniversityXiangtan411105China College of Electromechanical Engineering Shandong Engineering Laboratory for Preparation and Application of High-Performance Carbon-MaterialsQingdao University of Science&TechnologyQingdao266061China

Na superionic conductor(NASICON)-type La_(0.33)Ti_(2)(PO_(4))_(3)(LaTP) is firstly proposed as sodium/potassium storage *** density functional theory(DFT) calculations show that LaTP has good electronic character and low Na^(+)/K^(+)migration *** flexible La_(0.33)Ti_(2)(PO_(4))_(3)/C nanofiber film is synthesized via electrostatic spinning and investigated as free-standing electrode applied to sodium-ion batteries(SIBs) and potassiumion batteries(PIBs) in this *** low band gap and Na^(+)/K^(+) migration barriers of LaTP,unique morphology,and complete conductive carbon net allow the La_(0.33)Ti_(2)(PO_(4))_(3)/C nanofibers film to deliver high capacity(296.3 mAh·g^(-1) for SIBs and 235.8 mAh·g^(-1) for PIBs),excellent rate performance(142.5 mAh·g^(-1) for SIBs and50.5 mAh·g^(-1) for PIBs at 1.00 A·g^(-1)),and superior cyclability above 1000 *** full-cell tests show that the material has a good application prospect,indicating a promising flexible anode material for SIBs and PIBs.

关键词： Potassium-ion batteries(PIBs) Sodium-ion batteries(SIBs) Flexible La_(0.33)Ti_(2)(PO_(4))_(3)/C nanofibers film The first-principles calculations Migration potential energy

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Epipolythiodioxopiperazines from the Chaetomium sp

Epipolythiodioxopiperazines from the Chaetomium sp

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中国化学会第十届全国天然有机化学学术会议

作者： Geng Zhang fu-qian wang Department of Pharmacy Wuhan First Hospital

＜正＞Epipolythiodioxopiperazines（ETPs）are an important class of biologically active compounds mainly produced by *** class of compounds has received considerable attention from the scientific community since the se...

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基于SPKI电子支付中的银行端访问控制

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计算机科学 2003年第10期30卷 178-180页

作者：王茜王富强傅鹤岗朱庆生重庆大学计算机学院重庆400044

1引言近年来,随着Internet的普及,基于Internet的电子商务也得到迅速发展.但是安全支付体系、信用体系及配送体系等方面的滞后,严重制约着我国电子商务的快速发展.电子支付是其中关键的制约因素.

关键词：电子商务 SPKI 电子支付 SPKI Internet 信用体系银行访问控制

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Expression of Mucl During Implantation in Sows

Expression of Mucl During Implantation in Sows

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第十五次全国动物遗传育种学术讨论会

作者： REN qian,fu Jinlian,wang Aiguo~* College of Animal Science and Technology,China Agricultural University/Key Laboratory of Animal Genetics and Breeding Ministry of Agriculture 100193,Beijing,P.R.China

＜正＞Introduction Litter size is one of the most economically important traits in pig *** ovulation,fertilization and implantation,till the birth of piglet,every step may affect litter *** these steps,implantation is... 详细信息

关键词： RT-PCR Immunohistrochemistry Implantation endometrium Muc1 sows

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A review on carbon/magnetic metal composites for microwave absorption

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Journal of Materials Science & Technology 2021年第27期86卷 91-109页

作者： Baolei wang qian Wu Yonggang fu Tong Liu Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing 100191China

At present,developing high-efficiency microwave absorption materials with properties including lightweight,thin thickness,strong absorbing intensity and broad bandwidth is an urgent demand to solve the electromagnetic pollution *** ideal microwave absorber should have excellent dielectric and magnetic loss capabilities,thereby inducing attenuation and absorption of incident electromagnetic ***,various carbon/magnetic metal composites have been developed and expected to become promising candidates for high-performance microwave *** this review,we introduce the mechanisms of microwave absorption and summarize the recent advances in carbon/magnetic metal *** methods and microwave absorption properties of carbon/magnetic metal composites with different components,morphologies and microstructures are discussed in ***,the challenges and future prospects of carbon/magnetic metal absorbing materials are also proposed,which will be useful to develop high-performance microwave absorption materials.

关键词： Carbon/magnetic metal composites Component Microstructure Microwave absorption properties Absorbing mechanism

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Synchronization for the Environment of OFDM Cooperative Communications Based on Preamble Design and Phase Rotation

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China Communications 2015年第9期12卷 122-132页

作者： wang Xue qian Zhihong fu Yu College of Communication Engineering Jilin University

Timing and carrier frequency offset estimation are critical issue for OFDM cooperative communications. In view of the complexity and high accuracy requirement, 1/2 and 1/4 pilot symbol cycle CAZAC sequence structures are defined as the pilot frequency sequence. Estimation within one symbol cycle is carried out through averaging samples of two neighboring symbol cycles, after which the operation is expanded to all the symbol cycles in one band group. Taking multipath effect into account, the concept of phase rotation is proposed for a further step. Adjust the phase difference of estimated symbols by phase rotation, and cross estimation could be done. Meanwhile, timing scheme works within one cycle training sequence. Theoretical and simulation analysis indicate that CRLB does not only relate to estimation symbol length, but also be influenced by phase difference of estimation symbols seriously. In the condition that the length of estimation is fixed, the bigger the phase rotation angle is, the smaller the CRLB is. The complexity of proposed algorithm is less than full cycle average estimation method for almost 50%. Meanwhile, the estimation accuracy is approximate with the full cycle average estimation method as well. Timing scheme with the defined preamble structure is also proposed. Simulation proves its efficiency.

关键词： OFDM frequency offset estimation preamble phase rotation

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Simulation of wind-driven circulation and temperature in the near-shore region of southern Lake Michigan by using a channelized model

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Journal of Hydrodynamics 2013年第1期25卷 97-111页

作者： LIU Lubo fu Xu-dong wang Guang-qian Department of Civil and Geomatics Engineering Lyles College of Engineering California State University State Key Laboratory of Hydroscience and Engineering Tsinghua University

To enhance the efficiency of a pathogen forecasting model in the beach areas of southern Lake Michigan and to reduce the computation time, the near-shore current is approximated as a channelized flow parallel to the shorelines in clockwise or anti-clock- wise direction within the accuracy tolerance range. A channelized model with a curvilinear boundary can significantly reduce the computation effort, and at the same time achieve a good agreement between the predicted and measured water surface elevations, currents, and water temperatures. The sensitivity analysis results show that the suitable channel width for the near-shore region of southern Lake Michigan should be no less than 10 kin. The modeling results of the water temperature are much less sensitive to the channel width than those of the current velocity and the water surface elevation. The modeling results also show a close correlation between the speeds of the wind and the near-shore current. The current may fully respond the wind stress with a time lag of several hours. The correlation may provide an approximate estimation of the lake circulation under some wind conditions for a practical fore- casting purpose. More complex wind-current relationships need to be described with a more sophisticated hydrodynamic model. This verified model can be used for the pathogen forecasting in the near-shore regions of southern Lake Michigan in the future.

关键词： near-shore channelized wind hydrodynamic model

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ZG15MnMoVCu钢双相化的研究

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金属热处理 1988年第7期 19-24页

作者：钱存富王淑清吴畏李志强东北工学院

本文探讨了ZG15MnMoVCu钢双相化处理的可能性及双相化处理工艺。通过亚温淬火处理,该钢的冲击韧性得到了明显提高。双相化处理前的预处理对冲击韧性有很大影响,其中以预淬火为最好。本文还对铸钢双相处理的强韧化机理进行了讨论。认为... 详细信息

本文探讨了ZG15MnMoVCu钢双相化处理的可能性及双相化处理工艺。通过亚温淬火处理,该钢的冲击韧性得到了明显提高。双相化处理前的预处理对冲击韧性有很大影响,其中以预淬火为最好。本文还对铸钢双相处理的强韧化机理进行了讨论。认为晶粒细化、板条马氏体的存在、马氏体与铁素体的相间分布、铁素体中含有高密度位错等的综合作用,是使钢获得较好的综合力学性能的原因。

关键词：双相 ZG15MnMoVCu 亚温淬火板条马氏体高密度位错晶粒细化铁素体相强韧化机理淬火工艺力学性能

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Tuning energy output of PTFE/Al composite materials through gradient structure

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Defence Technology（防务技术） 2023年第8期26卷 134-142页

作者： Yao-feng Mao qian-qian He Jian wang Chuan-hao Xu Jun wang fu-de Nie China Academy of Engineering Physics Institute of Chemical Materials China

As a typical energetic composite,polytetrafluoroethylene(PTFE)/aluminum(Al)has been widely applied in explosives,pyrotechnics,and propellants due to its ultra-high energy density and intense exothermic *** this work,the radial gradient(RG)structure of PTFE/Al cylinders with three different PTFE morphologies(200 nm and 5μm particles and 5μm fiber)and content changes are prepared by 3D printing *** effect of radial gradient structure on the pressure output of PTFE/Al has been *** with the morphology change of PTFE,the change of component content in the gradient structure has an obvious effect on the pressure output of the PTFE/Al ***,the relationships of the morphology,content of PTFE and the combustion reaction of the PTFE/Al cylinder reveal that the cylinder shows a more complex flame propagation process than *** results could provide a strategy to improve the combustion and pressure output of PTFE/Al.

关键词： PTFE/Al composite Gradient structure Radial gradient Pressure output

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Distributed fixed step-size algorithm for dynamic economic dispatch with power flow limits

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Science China(Information Sciences) 2021年第1期64卷 110-122页

作者： Kun wang Zao fu qian XU Duxin CHEN Lei wang Wenwu YU The State Grid Zhejiang Economic Research Institute School of Cyber Science and Engineering Southeast University School of Mathematics Southeast University

In this study, a discrete-time distributed algorithm is proposed for solving the dynamic economic dispatch problem with active power flow limits and transmission line loss. To avoid the communication burden and implement the algorithm in a favorably distributed manner, the splitting method is used to bypass the centralized updating of the algorithm’s parameters, which is unavoidable when implementing conventional Lagrangian methods. The use of a fixed step-size and distributed update enhances the applicability of the algorithm. The performance and effectiveness of the proposed distributed algorithm are verified via numerical studies on the IEEE 14-bus system.

关键词： dynamic economic dispatch distributed optimization discrete-time algorithm active power flow limit transmission line loss

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