检索结果-南通市图书馆

Gravitational quasinormal modes of static Einstein-Gauss-Bonnet anti-de Sitter black holes

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2018年第4期42卷 188-197页

作者： Hong ma jin Li Department of Physics Chongqing University Chongqing 401331 China

In this paper, we describe quasinormal modes（QNMs） for gravitational perturbations of Einstein-GaussBonnet black holes（BHs） in higher dimensional spacetimes, and derive the corresponding parameters of such black holes in three types of spacetime（flat, de Sitter（d S） and anti-de Sitter（Ad S））. Our attention is concentrated on discussing the（in）stability of Einstein-Gauss-Bonnet Ad S BHs through the temporal evolution of all types of gravitational perturbation fields（tensor, vector and scalar）. It is concluded that the potential functions in vector and scalar gravitational perturbations have negative regions, which suppress quasinormal ringing. Furthermore,the influences of the Gauss-Bonnet coupling parameter α, the number of dimensions n and the angular momentum quantum number l on the Einstein-Gauss-Bonnet Ad S BHs quasinormal spectrum are analyzed. The QNM frequencies have greater oscillation and lower damping rate with the growth of α. This indicates that QNM frequencies become increasingly unstable with large α. Meanwhile, the dynamic evolutions of the perturbation field are compliant with the results of computation from the Horowitz and Hubeny method. Because the number of extra dimensions is connected with the string scale, the relationship between α and properties of Einstein-Gauss-Bonnet Ad S BHs might be beneficial for the exploitation of string theory and extra-dimensional brane worlds.

关键词： Einstein-Gauss-Bonnet AdS BHs gravitational perturbation quasinormal modes (QNMs)

Invasive alien plants in China: An update

在线全文

学校读者我要写书评

暂无评论

Plant Diversity 2023年第1期45卷 117-121页

作者： Qiang Hao jin-Shuang ma China National Botanical Garden(North Garden) Beijing 100093China

China is the largest country in eastern Asia and contains habitats that range from cold temperate to tropical *** Chinese have a long history of plant cultivation and *** most cultivated plants in China are native species,many are non-native plants introduced throughout Chinese history for food,medicine,horticulture or ornamental purposes(Xie et al.,2001;Axmacher and Sang,2013).The Catalogue of Alien Plants in China records a total of 14,710 alien plants(Lin and ma,2022).Among these,some,such as corn and potato,are used as food to meet the demands of China’s large ***-native plants that have established populations and colonized local environments are called naturalized *** studies indicate that the number of naturalized plant species in China ranges from 861(Jiang et al.,2011)to 933(Yan et al.,2019).

关键词： population habitat temperate

Dust-Acoustic Soliton in a Streaming Plasma

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1997年第6期14卷 432-435页

作者： LIU jin-yuan ma jin-xiu Department of Modern Physics University of Science and Technology of ChinaHefei 230027

Large amplitude dust-acoustic solitons in a plasma with ion streaming are investigated on a very slow time scale of dust motion with variable grain *** is found that both compressional and rarefactive solitons can coe... 详细信息

关键词： solitons soliton rare

Hierarchical Encapsulation and Rich sp^(2)N Assist Sb_(2)Se_(3)-Based Conversion-Alloying Anode for Long-Life Sodium-and Potassium-Ion Storage

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy & Environmental materials 2023年第6期6卷 372-382页

作者： Shaokun Chong Meng ma Lingling Yuan Shuangyan Qiao Shihong Dong Huakun Liu Shixue dou Frontiers Science Center for Flexible Electronics Xi'an Institute of Flexible Electronics and Xi'an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Institute for Superconducting and Electronic materials University of WollongongWollongong NSW 2522Australia

Sodium-and potassium-ion batteries have exhibited great application potential in grid-scale energy storage due to the abundant natural resources of Na and ***-alloying anodes with high theoretical capacity and low-operating voltage are ideal option for SIBs and PIBs but suffer the tremendous volume ***,a hierarchically structural design and sp^(2)N-doping assist a conversion-alloying material,Sb_(2)Se_(3),to achieve superior life span more than 1000 *** is confirmed that the Sb_(2)Se_(3)evolves into nano grains that absorb on the sp^(2)N sites and in situ form chemical bonding of C-N-Sb after initial *** results indicate that sp^(2)N has more robust interaction with Sb and stronger adsorption capacities to Na^(+)and K^(+)than that of sp3 N,which contributes to the durable cycling ability and high electrochemical activity,*** ex situ transmission electron microscopy and X-ray photoelectron spectroscopy results suggest that the Sb_(2)Se_(3)electrode experiences conversion-alloying dual mechanisms based on 12-electron transfer per formula unit.

关键词： antimony selenide conversion-alloying anode N-doped carbon potassium-ion batteries sodium-ion batteries

mainchain conformation ordering self-assembly tailored room temperature phosphorescence emission

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第01期 329-336页

作者： Yuzhu Li Yumeng Gao Feng Tian Yu Wang Yuan Yao Shaoliang Lin Xiang ma Binbin Xu Shanghai Key Laboratory of Advanced Polymeric materials Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Key Laboratory for Advance materials and Feringa Noble Prize Scientist Joint Research Centre Frontiers Science for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science & Technology

Developing organic room-temperature phosphorescence （RTP） materials with a wide range of tunable-emission is significant in expanding the applications of RTP ***,we rationally designed amphiphilic alternating copolymers poly(1,2-bis（4-alkoxyphenyl）ethane-1,2-dione-alt-（ethylene glycol）x)(P（Bz-alt-EGx）) that combined the advantage of alternating benzil and EGxskeleton,and tunable mainchain *** a mainchain conformation ordering assembly （COA） process,P（Bz-alt-EGx） self-assembled into well-defined platelets,and such assemblies emitted blue RTP at ca.425 nm due to the ordered folded-chain conformation and confined *** contrast,traditional self-assembly （TA） of P（Bz-alt-EGx） obtained less ordered aggregates,such as asymmetric worms,vesicles,and rod-like *** resultant less ordered aggregates exhibited yellow-green RTP at ca.550 *** wide-tuning RTP emission in solution （between blue and yellow-green,over125 nm） is realized using the P（Bz-alt-EGx） alternating copolymers under the treatment of different self-assembly *** study uncovers a new strategy to tailor the RTP emission through different self-assembly pathways and holds great promise for the fabrication of advanced optical materials.

关键词：

同方期刊数据库

Rubbing-Induced Vibration Response Analysis of Dual-Rotor-Casing System

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2018年第1期35卷 101-108页

作者： ma Xinxing ma Hui Zeng jin Piao Yuhua School of Mechanical Engineering and Automation Northeastern University State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University

Considering gyroscopic effects caused by rotational speed,torsional vibration as well as coupling effects among inner rotor,out rotor and casing,a dynamic model of the dual-rotor-casing system is established using finite element(FE)*** comparing the natural characteristics obtained from maTLAB and ANSYS,the developed model is *** rubbing-induced vibration responses in dual-rotor-casing system are *** effects of rotational speed and speed ratio on rubbing vibration responses of the system are *** show that different combined frequency components will appear in the spectrum except two unbalanced excitation frequencies and their multiple frequency components,and these frequencies can be used as the dual-rotor aero-engine rubbing failure diagnosis frequencies when rubbing ***,the amplitude of torsional vibration is larger than that of lateral vibration under the same working condition,and speed ratio has a great impact on the periodicity of the system rubbing-induced motion *** amplitude of rubbing-induced responses under counter-rotation is less than that under co-rotation with the same parameters.

关键词： dual-rotor-casing system rubbing fault finite element method coupling dynamic

Locally Enhanced Flow and Electric Fields Through a Tip Effect for Efficient Flow‑Electrode Capacitive Deionization

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 1-17页

作者： Ziquan Wang Xiangfeng Chen Yuan Zhang Jie ma Zhiqun Lin Amor Abdelkader maria‑magdalena Titirici Libo Deng College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China Research Center for Environmental Functional materials College of Environmental Science and EngineeringTongji University1239 Siping RoadShanghai 200092People’s Republic of China Department of Chemical and Biomolecular Engineering National University of SingaporeSingapore 117585Singapore Department of Engineering Faculty of Science and TechnologyBournemouth UniversityTalbot CampusFern BarrowPooleEngland BH125BBUK Institut de Chimie de Nice UniversitéCôte d’AzurUMR CNRS 727228 Av.Valrose06108 NiceFrance Department of Chemical Engineering Imperial College LondonSouth Kensington CampusExhibition RdLondon SW72AZUK

Low-electrode capacitive deionization(FCDI)is an emerging desalination technology with great potential for removal and/or recycling ions from a range of ***,it still suffers from inefficient charge transfer and ion transport kinetics due to weak turbulence and low electric intensity in flow electrodes,both restricted by the current ***,a new tip-array current collector(designated as T-CC)was developed to replace the conventional planar current collectors,which intensifies both the charge transfer and ion transport *** effects of tip arrays on flow and electric fields were studied by both computational simulations and electrochemical impedance spectroscopy,which revealed the reduction of ion transport barrier,charge transport barrier and internal *** the voltage increased from 1.0 to 1.5 and 2.0 V,the T-CC-based FCDI system(T-FCDI)exhibited average salt removal rates(ASRR)of 0.18,0.50,and 0.89μmol cm^(-2) min^(-1),respectively,which are 1.82,2.65,and 2.48 folds higher than that of the conventional serpentine current collectors,and 1.48,1.67,and 1.49 folds higher than that of the planar current ***,with the solid content in flow electrodes increased from 1 to 5 wt%,the ASRR for T-FCDI increased from 0.29 to 0.50μmol cm^(-2) min^(-1),which are 1.70 and 1.67 folds higher than that of the planar current ***,a salt removal efficiency of 99.89%was achieved with T-FCDI and the charge efficiency remained above 95%after 24 h of operation,thus showing its superior long-term stability.

关键词： Flow-electrode Capacitive deionization Current collector Tip effect Desalination

In situ constructing(MnS/Mn_(2)SnS_4)@N,S-ACTs heterostructure with superior Na/Li-storage capabilities in half-cells and pouch full-cells

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第11期35卷 522-527页

作者： Dai-Huo Liu Ao Wang Hong-Yan Lü Xing-Long Wu Dan Luo Wen-Hao Li jin-Zhi Guo Haozhen dou Qianyi ma Zhongwei Chen Key Laboratory of Green Chemical Media and Reaction Ministry of EducationCollaborative Innovation Center of Henan Province for Fine Chemicals Green Manufacturing of Fine ChemicalsSchool of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiang 453007China Faculty of Chemistry Northeast Normal UniversityChangchun 130024China MOE Key Laboratory for UV Light-Emitting materials and Technology Northeast Normal UniversityChangchun 130024China Power Battery and Systems Research Center Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Department of Chemical Engineering Waterloo Institute for NanotechnologyWaterloo Institute for Sustainable EnergyWaterloo UniversityWaterlooON N2L 3G1Canada

Effective design of nanoheterostructure anode with high ion/electron migration kinetics can give electrode with superior electrochemical ***,the design and preparation of nanoheterostructure composites with high-capacity and long cycling life in half and pouch full cells remain a big ***,a novel micro-pore MnS/Mn_(2)SnS_(4)heterostructure nanowire were in situ encapsulated into the N and S elements co-doped amorphous carbon tubes(abbreviated as(MnS/Mn_(2)SnS_(4))@N,S-ACTs)and showed superior energy storage properties in Na-/Li-ion half cells and pouch full *** Na-/Li-storage capabilities improvement are attribute to the strong synergistic effect between MnS/Mn_(2)SnS_(4)heterostructure and N,S-ACTs protective layer,the former induces an local built-in electric field between Mn_(2)Sn S_(4)and MnS during charging/discharging,accelerating interfacial ion/electron diffusion dynamics,the latter effective maintains the morphology and volume evolution during Na~+/Li~+charging/discharging,achieving a long-term cycling stability(e.g.,high discharge capacity of 79.2 mah/g with the capacity retention of 79.3%can be gained after 2200 cycles at 3 C in(Mn S/Mn_(2)Sn S_(4))@N,S-ACTs//LiFePO_(4)pouch full cells;a high capacity of~34 mah/g at 10 C can be got with a Coulombic efficiency of 100%after 1000 cycles in pouch(Mn S/Mn_(2)Sn S_(4))@N,S-ACTs//Na_(3)V_(2)(PO_(4))_(2)O_(2)F full cells.

关键词： (MnS/Mn_(2)SnS_(4))@N S-ACTs Heterostructure Long cycling life Na-/Li-ion half cells Pouch full cells

Improved interfacial adhesion for stable flexible inverted perovskite solar cells

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2023年第1期76卷 288-294,I0008页

作者： Jie dou Qizhen Song Yue ma Hao Wang Guizhou Yuan Xueyuan Wei Xiuxiu Niu Sai ma Xiaoyan Yang jing dou Shaocheng Liu Huanping Zhou Cheng Zhu Yihua Chen Yujing Li Yang Bai Qi Chen Beijing Key Laboratory of Construction Tailorable Advanced Functional materials and Green Applications MIIT Key Laboratory for Low-dimensional Quantum Structure and DevicesExperimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China School of materials Science and Engineering Peking UniversityBeijing 100871China

Flexible perovskite solar cells have attracted widespread attention due to their unique advantages in lightweight,high flexibility,and easy deformation,which are suitable for portable ***,the inverted(p-i-n)structured devices suffer from poor stability largely due to the low adhesion at the brittle interface(the hole transport layer/perovskite).Herein,zeolitic imidazolate framework-67(ZIF-67)is applied to inverted structured cells to optimize the interface and prolong the device *** a result,the flexible devices based on ZIF-67 obtain the champion power conversion efficiency of 20.16%.Over 1000 h under continuous light irradiation,the device retains 96%and 80%of its original efficiency without and with bias,***,devices show mechanical endurance with over 78%efficiency retention after 10,000 cycles of consecutive bending cycles(R=6 mm).The introduction of ZIF-67 suppresses the cracking in device bending,which results in improved environmental stability and bending durability.

关键词： ZIF-67 Flexible perovskite solar cells Interfacial adhesion Stability