检索结果-南通市图书馆

All-dielectric terahertz metasurface governed by bound states in the continuum with high-Q factor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2024年第2期31卷 44-54页

作者： Li Kun zhao Xu Wang Meng Jia Xingning zhao ruiqi Lu Guizhen School of Integrated Circuit Science and Engineering Tianjin University of TechnologyTianjin 300384China School of Electronic and Electrical Engineering Ningxia UniversityYinchuan 750021China QILU Aerospace Information Research Institute Chinese Academy of Sciences(CAS)Jinan 250101China State Key Laboratory of Media Convergence and Communication Communication University of ChinaBeijing 100024China

The method of terahertz(THz)resonance with a high-quality(high-Q)factor offers a vital physical mechanism for metasurface sensors and other high-Q factor ***,it is challenging to excite the resonance with a high-Q factor in metasurfaces with proper sensitivity as well as figure of merit(FOM)***,an all-dielectric metasurface composed of two asymmetrical rectangular blocks is *** and silicon are the materials applied for the substrate and cuboids *** distinct resonance governed by bound states in the continuum(BIC)is excited by forming an asymmetric cluster by a novel hybrid method of cutting and moving the *** investigation focuses on analyzing the transmission spectra of the metasurface under different variations in structural parameters and the loss of silicon refractive *** the proposed defective metasurface serves as a transmittance sensor,it shows a Q factor of 1.08×10^(4)and achieves an FOM up to 4.8×10^(6),which is obtained under the asymmetric parameter equalling 1μ***,the proposed defective metasurface is sensitive to small changes in refractive *** the thickness of the analyte is 180μm,the sensitivity reaches a maximum value of 578 GHz/***,the proposed defective metasurface exhibits an extensive number of possible applications in the filters,biomedical diagnosis,security screening,and so on.

关键词： terahertz(THz)metasurface high-quality(high-Q)factor bound states in the continuum figure of merit(FOM)

Perspective on gallium-based room temperature liquid metal batteries

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2022年第1期16卷 23-48页

作者： Zerong XING Junheng FU Sen CHEN Jianye GAO ruiqi zhao Jing LIU Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China School of Medicine Tsinghua UniversityBeijing 100084China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

Recent years have witnessed a rapid development of deformable devices and epidermal electronics that are in urgent request for flexible *** intrinsically soft and ductile conductive electrode materials can offer pivotal hints in extending the lifespan of devices under frequent *** inherent liquidity,metal-licity,and biocompatibility,Ga-based room-temperature liquid metals(GBRTLMs)are potential candidates to fulfill the requirement of soft ***,to illustrate the glamour of liquid components,high-temperature liquid metal batteries(HTLMBs)are briefly summarized from the aspects of principle,application,advantages,and ***,Ga-based liquid metals as main working electrodes in primary and secondary batteries are reviewed in terms of battery configurations,working mechanisms,and ***,Ga-based liquid metals as auxiliary working electrodes in lithium and nonlithium batteries are also discussed,which work as functional self-healing additives to alleviate the degradation and enhance the durability and capacity of the battery *** that,Ga-based liquid metals as interconnecting electrodes in multi-scenarios including photovoltaics solar cells,generators,and supercapacitors(SCs)are interpreted,*** summary and perspective of Ga-based liquid metals as diverse battery materials are also focused ***,it was suggested that tremendous endeavors are yet to be made in exploring the innovative battery chemistry,inherent reaction mechanism,and multifunctional integration of Ga-based liquid metal battery systems in the coining future.

关键词： liquid metals soft electrodes flexible batteries deformable energy supply devices epidermal electronics

A double-layer covered architecture with spinel phase induced by LiPP for Co-free Li-rich cathode with high-rate performance and long lifespan

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第5期16卷 6805-6814页

作者： ruiqi zhao Manman Wu Peixin Jiao Xueting Wang Jie Zhu Yang zhao Hongtao Zhang Kai Zhang Chenxi Li Yanfeng Ma Yongsheng Chen The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China State Key Laboratory of Elemento-Organic Chemistry Nankai UniversityTianjin 300071China Renewable Energy Conversion and Storage Center(RECAST) Nankai UniversityTianjin 300071China Department Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China Engineering Research Center of High-efficiency Energy Storage(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China

Co-free Li-rich Mn-based layered oxides are promising candidates for next-generation lithium-ion batteries(LIBs)due to their high specific capacity,high voltage,low ***,their commercialization is hindered by limited cycle life and poor rate ***,an in-situ simple and low-cost strategy with a nanoscale double-layer architecture of lithium polyphosphate(LiPP)and spinel phase covered on top of the bulk layered phase,is developed for Li_(1.2)Mn_(0.6)Ni_(0.2)O_(2)(LMNO)using Li^(+)-conductor LiPP(denoted as LMNO@S-LiPP).With such a double-layer covered architecture,the half-cell of LMNO@S-LiPP delivers an extremely high capacity of 202.5 mAh·g^(−1)at 1 A·g^(−1)and retains 85.3%of the initial capacity after 300 cycles,so far,the best highrate electrochemical performance of all the previously reported *** energy density of the full-cell assembled with commercial graphite reaches 620.9 Wh·kg^(−1)(based on total weight of active materials in cathode and anode).Mechanism studies indicate that the superior electrochemical performance of LMNO@S-LiPP is originated from such a nanoscale double-layer covered architecture,which accelerates Li-ion diffusion,restrains oxygen release,inhibits interfacial side reactions,suppresses structural degradation during ***,this strategy is applicable for other high-energy-density cathodes,such as LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2),Li_(1.2)Ni_(0.13)Co_(0.13)Mn_(0.54)O_(2),LiCoO_(2).Hence,this work presents a simple,cost-effective,scalable strategy for the development of high-performance cathode materials.

关键词： Co-free Li-rich layered oxides double-layer covered architecture lithium polyphosphate high-rate performance long cycle life

Scanning Tunneling Microscope Observations of Non-AB Stacking of Graphene on Ni Films

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2011年第7期4卷 712-721页

作者： ruiqi zhao Yanfeng Zhang Teng Gao Yabo Gao Nan Liu Lei Fu Zhongfan Liu Center for Nanochemistry （CNC） Beijing National Laboratory for Molecular Sciences State Key Laboratory for Structural Chemistry of Unstable and Stable Species College of Chemistry and Molecular Engineering Peking University Beijing 100871 China College of Physics and Chemistry Henan Polytechnic University Henan 454003 China Department of Advanced Materials and Nanotechnology College of Engineering Peking University Beijing 100871 China

Microscopic features of graphene segregated on Ni films prior to chemical transfer--including atomic structures of monolayers and bilayers, Moire patterns due to non-AB stacking, as well as wrinkles and ripples caused by strain effects-have been characterized in detail by high-resolution scanning tunneling microscopy （STM）. We found that the stacking geometry of the bilayer graphene usually deviates from the traditional Bernal stacking （or so-called AB stacking）, resulting in the formation of a variety of Moir6 patterns. The relative rotations inside the bilayer were then qualitatively deduced from the relationship between Moir6 patterns and carbon lattices. Moreover, we found that typical defects such as wrinkles and ripples tend to evolve around multi-step boundaries of Ni, thus reflecting strong perturbations from substrate corrugations. These investigations of the morphology and the mechanism of formation of wrinkles and ripples are fundamental topics in graphene research. This work is expected to contribute to the exploration of electronic and transport properties of wrinkles and ripples.

关键词： Graphene scanning tunneling microscopy (STM) segregation Moire pattern growth

A lithium sulfonylimide COF-modified separator for highperformance Li-S batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第11期16卷 12601-12607页

作者： Jie Liu Jinping Zhang Jie Zhu ruiqi zhao Yamin Zhang Yanfeng Ma Chenxi Li Hongtao Zhang Yongsheng Chen The Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials Institute of Polymer ChemistryCollege of ChemistryNankai UniversityTianjin 300071China State Key Laboratory of Elemento-Organic Chemistry Nankai UniversityTianjin 300071China Renewable Energy Conversion and Storage Center(RECAST) Nankai UniversityTianjin 300071China State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China

Lithium-sulfur(Li-S)batteries are highly regarded as the next-generation high-energy-density secondary batteries due to their high capacity and large theoretical energy ***,the practical application of these batteries is hindered mainly by the polysulfide shuttle ***,we designed and synthesized a new lithium sulfonylimide covalent organic framework(COF)material(COF-LiSTFSI,LiSTFSI=lithium(4-styrenesulfonyl)(trifluoromethanesulfonyl)imide),and further used it to modify the common polypropylene(PP)separator of Li-S *** COF-LiSTFSI with sulfonylimide anion groups features stronger electronegativity,thus can effectively facilitate the lithium ion conduction while significantly suppress the diffusion of polysulfides via the electrostatic *** with the unmodified PP separator,the COF-LiSTFSI modified separator results in a high ionic conductivity(1.50 mS·cm^(−1))and Li+transference number(0.68).Consequently,the Li-S battery using the COF-LiSTFSI modified separator achieves a high capacity of 1229.7 mAh·g^(−1)at 0.2 C and a low decay rate of only 0.042%per cycle after 1000 cycles at 1 C,compared with those of 941.5 mAh·g^(−1)and 0.061%using the unmodified PP separator,*** results indicate that by choosing suitable functional groups,an effective strategy for COF-modified separators could be developed for high-performance Li-S batteries.

关键词： covalent organic frameworks lithium sulfonylimide ion selective modified separator lithium-sulfur batteries

China-Pakistan Economic Corridor:Sailing Flagship

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Understanding 2016年第2期 9-11页

作者： zhao ruiqi Wang Shan Institute of Research on Communication Politics of Communication University of China the Charhar Institute

Major breakthroughs were achieved in cooperation of transportation infrastructure under the China-Pakistan Economic Corridor in May,2016:the biggest transportation infrastructure project in the Corridor—the construct... 详细信息

关键词： Pakistan cooperation infrastructure initiative transportation details highway Major exchanges attitude

建构网络恐怖主义治理的国际规范——一种新自由制度主义的分析框架

在线全文

学校读者我要写书评

暂无评论

吉首大学学报（社会科学版） 2020年第4期41卷 85-96页

作者：赵瑞琦中国传媒大学马克思主义学院北京100024

处于全球化纵深演进和信息化迅速发展的时代,互联网在客观上成为恐怖主义滋生的放大器。与网络冲突、网络间谍和网络犯罪一样,网络恐怖主义成为网络空间安全的威胁来源和风险因素,是国际安全领域最新型、最棘手的难题之一。为此,需要通... 详细信息

处于全球化纵深演进和信息化迅速发展的时代,互联网在客观上成为恐怖主义滋生的放大器。与网络冲突、网络间谍和网络犯罪一样,网络恐怖主义成为网络空间安全的威胁来源和风险因素,是国际安全领域最新型、最棘手的难题之一。为此,需要通过国际规范的建构与扩散,降低互联网对极端主义的赋能。基于新自由制度主义关于国际合作的理论,经由"组织、机制和惯习"的路径,即网络空间治理层面的"共同协作"、日常层面的"威慑防范"和惩戒层面的"合力打击",可以构建网络恐怖主义治理的人类利益与命运的共同体。就现实而言,尽管由于各国的法律框架和安全措施存在差异,网络追查无法准确溯源,在切断传播路径上企业和国家之间存在价值冲突等原因,打击和处罚经常是跨国性质的网络恐怖主义尚存在很多问题与挑战,国际社会已经开始从规则、机制、机构和秩序等维度凝聚共识、联动备战并持续努力,进而通过加强各国的政策和实践协调及威胁信息和最佳实践的共享等,为形成惯习、建立全球性的制度框架提供可行的路径。

关键词：网络空间网络空间治理网络恐怖主义新自由制度主义国际规范

在线全文

学校读者我要写书评

暂无评论

塔利班为何卷土重来?

现代国际关系 2007年第5期 48-53,64页

作者：赵瑞琦中国传媒大学国际传播学院

塔利班剿而不灭、卷土重来已成事实。阿富汗民心所向的变化、美国政策的失误、美国可支配力量的分散和限度、阿富汗地形的复杂、阿中央政府的软弱和贪腐以及巴基斯坦国内部分势力对其暗中支持,都是造成这一局面的原因。面对严峻的现实,... 详细信息

塔利班剿而不灭、卷土重来已成事实。阿富汗民心所向的变化、美国政策的失误、美国可支配力量的分散和限度、阿富汗地形的复杂、阿中央政府的软弱和贪腐以及巴基斯坦国内部分势力对其暗中支持,都是造成这一局面的原因。面对严峻的现实,塔利班和美国都不会退让,卡尔扎伊通过谈判求和平的策略成功希望也似乎不大。

关键词：塔利班美国反恐策略

基于自适应NSGA-Ⅱ算法的变截面涡旋盘优化

在线全文

学校读者我要写书评

暂无评论

华中科技大学学报（自然科学版） 2021年第3期49卷 63-68页

作者：刘涛赵睿琦孙永吉兰州理工大学机电工程学院甘肃兰州730050 兰州工业学院机电工程学院甘肃兰州730050

针对目前对涡旋压缩机涡旋盘的优化设计多以几何性能最佳为优化目标,其力学性能较差这一缺点,提出了基于自适应第二代非支配遗传算法(NSGA-Ⅱ)、综合考虑力学性能和几何性能的变截面涡旋盘多目标优化设计方法.针对由基圆渐开线和高次曲... 详细信息

针对目前对涡旋压缩机涡旋盘的优化设计多以几何性能最佳为优化目标,其力学性能较差这一缺点,提出了基于自适应第二代非支配遗传算法(NSGA-Ⅱ)、综合考虑力学性能和几何性能的变截面涡旋盘多目标优化设计方法.针对由基圆渐开线和高次曲线组成的变截面涡旋盘,确立了以涡旋型线特征参数表示的动涡旋轴向气体力及内容积比数学模型,以轴向力最小和内容积比最大为设计目标进行多目标优化设计,引入了根据种群的进化状态来进行自我调节的交叉算子和变异算子,以提高NSGA-Ⅱ算法的效率和最优解的分布均匀度,并得到了Pareto最优解集.在最优解集中挑选三种优化型涡旋盘与传统型涡旋盘进行对比分析,其最大轴向气体力分别减少了3.20%,1.08%和1.90%,内容积比分别提高了5.37%,6.64%和3.35%,表明提出的优化方法可以得到综合性能较优的变截面涡旋盘.

关键词：变截面涡旋盘力学性能几何性能自适应NSGA-Ⅱ 多目标优化设计