检索结果-南通市图书馆

Wire-in-Wire TiO_(2)/C Nanofibers Free-Standing Anodes for Li-Ion and K-Ion Batteries with Long Cycling Stability and High Capacity

引用

Nano-Micro Letters 2021年第7期13卷 91-104页

作者： Die Su Yi Pei Li liu Zhixiao liu junfang liu Min Yang Jiaxing Wen Jing Dai Huiqiu Deng Guozhong Cao National Base for International Science and Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage BatteryHunan Province Key Laboratory of Electrochemical Energy Storage and ConversionSchool of ChemistryXiangtan UniversityXiangtan 411105People’s Republic of China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195-2120USA College of Materials Science and Engineering Hunan UniversityChangsha 410082People’s Republic of China School of Physics and Electronics Hunan UniversityChangsha 410082People’s Republic of China

Wearable and portable mobile phones play a critical role in the market, and one of the key technologies is the flexible electrode with high specific capacity and excellent mechanical flexibility. Herein, a wire-in-wire TiO_(2)/C nanofibers (TiO_(2) ww/CN) film is synthesized via electrospinning with selenium as a structural inducer. The interconnected carbon network and unique wire- in-wire nanostructure cannot only improve electronic conductivity and induce effective charge transports, but also bring a superior mechanic flexibility. Ulti-mately, TiO_(2) ww/CN film shows outstanding electrochemical performance as free-standing electrodes in Li/K ion batteries. It shows a discharge capacity as high as 303 mAh g^(−1) at 5 A g^(−1) after 6000 cycles in Li half-cells, and the unique structure is well-reserved after long-term cycling. Moreover, even TiO_(2) has a large diffusion barrier of K^(+), TiO_(2) ww/CN film demonstrates excellent perfor-mance (259 mAh g^(−1) at 0.05 A g^(−1) after 1000 cycles) in K half-cells owing to extraordinary pseudocapacitive contribution. The Li/K full cells consisted of TiO_(2) ww/CN film anode and LiFePO_(4)/Perylene-3,4,9,10-tetracarboxylic dianhydride cathode possess outstanding cycling stability and demonstrate practical application from lighting at least 19 LEDs. It is, therefore, expected that this material will find broad applications in portable and wearable Li/K-ion batteries.

关键词： Free-standing TiO_(2)/C nanofiber Li-ion battery K-ion battery First-principles calculation Full cells

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nitrogen-Doped TiO_2–C Composite Nanofibers with High-Capacity and Long-Cycle Life as Anode Materials for Sodium-Ion Batteries

引用

Nano-Micro Letters 2018年第4期10卷 255-267页

作者： Su Nie Li liu junfang liu Jianjun Xie Yue Zhang Jing Xia Hanxiao Yan Yiting Yuan Xianyou Wang National Base for International Science and Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery Hunan Province Key Laboratory of Electrochemical Energy Storage and Conversion School of Chemistry Xiangtan University Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai University

Nitrogen-doped TiO_2–C composite nanofibers(TiO_2/N–C NFs) were manufactured by a convenient and green electrospinning technique in which urea acted as both the nitrogen source and a pore-forming agent. The TiO_2/N–C NFs exhibit a large specific surface area(213.04 m^2 g^(-1)) and a suitable nitrogen content(5.37 wt%). The large specific surface area can increase the contribution of the extrinsic pseudocapacitance, which greatly enhances the rate capability. Further, the diffusion coefficient of sodium ions(DNa_+) could be greatly improved by the incorporation of nitrogen atoms. Thus, the TiO_2/N–C NFs display excellent electrochemical properties in Na-ion batteries. A TiO_2/N–C NF anode delivers a high reversible discharge capacity of 265.8 mAh g^(-1) at 0.05 A g^(-1) and an outstanding long cycling performance even at a high current density(118.1 m Ah g^(-1)) with almost no capacity decay at 5 A g^(-1) over 2000 cycles. Therefore, this work sheds light on the application of TiO_2-based materials in sodium-ion batteries.

关键词： Nanofibers Anode materials Sodium-ion batteries Pseudocapacitance Nitrogen-doping

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Temporal-spatial distributions of road silt loadings and fugitive road dust emissions in Beijing from 2019 to 2020

引用

Journal of Environmental Sciences 2023年第10期132卷 56-70页

作者： Haibin Wang Lihui Han Tingting Li Song Qu Yuncheng Zhao Shoubin Fan Tong Chen Haoran Cui junfang liu Key Laboratory of Beijing on Regional Air Pollution Control Faculty of Environment and LifeBeijing University of TechnologyBeijing 100124China Beijing Municipal Research Institute of Eco-Environmental Protection Beijing 100037China National Engineering Research Center of Urban Environmental Pollution Control Beijing 100037China

Road silt loading(sL)is an important parameter in the fugitive road dust(FRD)*** this study,the improved Testing Re-entrained Aerosol Kinetic Emissions from Roads(TRAKER)combined with the AP-42 method was firstly developed to quickly measure and estimate the sLs of paved roads in Beijing,*** annual average sLs in Beijing was 0.59±0.31 g/m^(2)in 2020,and decreased by 22.4%compared with that in *** seasonal variations of sLs followed the order of spring>winter>summer>autumn in the two *** seasonal mean road sLs on the same type road in the four seasons presented a decline trend from^(2)019 to 2020,especially on the Expressway,decreasing 47.4%-72.7%.The road sLs on the different type roads in the same season followed the order of Major arterial∼Minor arterial∼Branch road>Express road,and Township road∼Country highway>Provincial highway∼National *** emission intensities of PM10 and PM_(2.5)from FRD in Beijing in 2020 were lower than those in *** PM10 and PM_(2.5)emission intensities at the four planning areas in the two years all presented the order of the capital functional core area>the urban functional expansion area>the urban development new area>the ecological conservation and development *** annual emissions of PM10 and PM_(2.5)from FRD in Beijing in 2020 were 74,886 ton and 18,118 ton,respectively,decreasing by∼33.3%compared with those in 2019.

关键词： Road silt loading Temporal-spatial distribution Emission factor Emission inventory

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

液相外延法制备β-BBO薄膜

引用

材料研究学报 2007年第4期21卷 444-448页

作者：刘军芳徐军姚武同济大学材料科学与工程学院上海200092 中国科学院上海光学精密机械研究所上海201800

采用液相外延法在掺Sr^(2+)的α-BBO(001)村底上制备了β-BBO薄膜,研究了制备条件对薄膜质量的影响.结果表明:当生长温度为810℃时,转速为300r/min生长的外延膜具有较高的结晶质量,且随着生长时间的延长,外延膜的结晶质量有所提高.β-BB... 详细信息

采用液相外延法在掺Sr^(2+)的α-BBO(001)村底上制备了β-BBO薄膜,研究了制备条件对薄膜质量的影响.结果表明:当生长温度为810℃时,转速为300r/min生长的外延膜具有较高的结晶质量,且随着生长时间的延长,外延膜的结晶质量有所提高.β-BBO薄膜呈c轴高度择优取向,薄膜的双晶摇摆曲线半峰宽值FWHM仅为676.6″,表明β-BBO薄膜较好的结晶质量;在不具备相位匹配的条件下,β-BBO外延膜也能够实现二次谐波输出.

关键词：无机非金属材料液相外延 β-BB0薄膜

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于响应面法的二元固废地聚物配比优化试验研究

引用

材料导报 2024年第S02期38卷 265-271页

作者：刘子豪刘俊芳崔潮张天然内蒙古工业大学土木工程学院呼和浩特010051 沙旱区地质灾害与岩土工程防御自治区高等学校重点实验室呼和浩特010051 内蒙古工业大学地质技术与岩土工程内蒙古自治区工程研究中心呼和浩特010051

以原样煤矸石、矿渣为全固废主料,水玻璃、氢氧化钠为复合激发剂配体,制备煤矸石-矿渣地聚物(CGSG)。基于响应面法中的Box-Behnken设计,研究矿渣掺量、水玻璃模数和NaOH掺量对CGSG浆体流动度、7 d和28 d抗压强度的影响。构建响应面回归... 详细信息

以原样煤矸石、矿渣为全固废主料,水玻璃、氢氧化钠为复合激发剂配体,制备煤矸石-矿渣地聚物(CGSG)。基于响应面法中的Box-Behnken设计,研究矿渣掺量、水玻璃模数和NaOH掺量对CGSG浆体流动度、7 d和28 d抗压强度的影响。构建响应面回归模型,分析各因素及其交互作用对浆料流动度及固结体强度的影响,并得到综合性能最佳的配比参数。结果表明各因素与响应值呈二次多项式模型,回归系数R 2均大于0.96,模型可靠性强且拟合性好。CGSG对各单一因素响应较敏感,部分因素交互项影响显著。通过模型预测优化获得最佳参数配比为煤矸石含量60%,矿渣掺量40%,水玻璃模数1.56,NaOH掺量8%,此时28 d的水化产物主要为C-A-S-H、N-A-S-H等凝胶类物质,这些物质相互交接、交错叠加,形成致密程度高和骨架构造强的二元固废地聚物注浆材料。本研究的成果拓宽了煤矸石、矿渣固废使用场景,提高了固体废物回收利用率。

关键词：原样煤矸石高炉矿渣地聚物响应面法最优配比

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

“一带一路”背景下云南企业“走出去”的法律风险控制

引用

云南行政学院学报 2018年第6期20卷 171-176页

作者：刘俊芳云南行政学院法学教研部云南昆明650111

云南要建设成为推进"一带一路"发展的重要省份,抓住发展机遇、推动对外合作,鼓励云南企业"走出去"。但由于各国法律文化、法律制度及政治体制的差异,"走出去"企业面临诸多法律问题和法律风险,只有对法律风险加以防范,才能保障投资安全... 详细信息

云南要建设成为推进"一带一路"发展的重要省份,抓住发展机遇、推动对外合作,鼓励云南企业"走出去"。但由于各国法律文化、法律制度及政治体制的差异,"走出去"企业面临诸多法律问题和法律风险,只有对法律风险加以防范,才能保障投资安全。本文针对云南省"走出去"企业海外投资中如何识别、预防和化解法律风险提出了相应的对策和建议。

关键词：法律风险控制企业走出去一带一路

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Patterns of presence-absence variants in Upland cotton

引用

Science China(Life Sciences) 2020年第10期63卷 1600-1603页

作者： junfang liu Xianliang Zhang Lingling Dou Wei Li Xiaojian Zhou Yangai liu Xiaoyu Pei Zhongying Ren Wensheng Zhang Huaizhu Li Wenbo Wang Changsong Zou Kunlun He Fei Zhang Wenyu Ma Haihong Shang Hongbin Li Daigang Yang Guanghui Xiao Xiongfeng Ma State Key Laboratory of Cotton Biology Institute of Cotton ResearchChinese Academy of Agricultural SciencesAnyang 455000China School of Chemistry and Chemical Engineering Xianyang Normal UniversityXianyang 712000China Key Laboratory of Plant Stress Biology State Key Laboratory of Cotton BiologySchool of Life SciencesHenan UniversityKaifeng 475004China Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of ChinaCollege of Life SciencesShaanxi Normal UniversityXi’an 710119China Zhengzhou Research Base State Key Laboratory of Cotton BiologyZhengzhou UniversityZhengzhou 450001China College of Life Sciences Shihezi UniversityShihezi 832003China

Dear Editor,Sources of genetic variations in genomes include small-scale sources(such as single-nucleotide polymorphisms(SNPs),insertions/deletions(InDels),and simple sequence repeats and larger-scale structural variations(mainly presence-absence variants(PAVs))and copy number variants).PAVs are sequences that are either inserted or missing in genomes in comparison with a reference sequence or *** can have a much longer sequence than SNPs and InDels,as illustrated in the human genome(Conrad et al.,2010).PAVs are important genomic structural variations that can directly affect genomic structure and key functional genes in the genome(Kumar et al.,2007).Moreover,the use of PAVs for studying quantitative traits has been valuable(Lam et al.,2010).

关键词： traits sequence insertion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Things Oriented Traffic Control System Design of Jing-Jin-Ji Megalopolis

Things Oriented Traffic Control System Design of Jing-Jin-Ji...

引用

对接京津——产业经济行业发展

作者： Hu Hezhi liu junfang Pang jing Su Shuangchen Li Xue Hebei university of technology Langfang normal college Hebei University of Technology

Traffic control requirement is increasing with the grow of motor vehicle ownership and traffic flow for the development of Jing-Jin-Ji *** transportation system is the frontier research subject in china,meanwhile,things of internet becoming the significant change in Information *** article applies things of internet in transportation system in order to high efficient control.

关键词： Jing-Jin-Jimegalopolis Thingsofinternet Intelligenttransportationsystem

来源： cnki会议 cnki会议评论

在线全文

学校读者我要写书评

暂无评论

基于污染物临界粘附力的超滤动态过程的CFD模拟

引用

环境科学学报 2016年第10期36卷 3636-3642页

作者：崔海航刘珺芳西安建筑科技大学环境与市政工程学院西安710055

针对膜污染的动态变化问题,通过计算流体力学(CFD)手段建立了中空纤维膜的二维轴对称模型,综合考虑了污染物间粘附力及水流剪切力的影响,提出有效剪切应力的概念,在模型中耦合了变形几何、自由多孔介质流动及稀物质传递3种物理场,将污... 详细信息

针对膜污染的动态变化问题,通过计算流体力学(CFD)手段建立了中空纤维膜的二维轴对称模型,综合考虑了污染物间粘附力及水流剪切力的影响,提出有效剪切应力的概念,在模型中耦合了变形几何、自由多孔介质流动及稀物质传递3种物理场,将污染物法向积累、切向有效剪切与污染物界面处的网格速度相关联,建立了膜面污染物截留的动态模型.依据死端过滤与错流过滤的实验数据,确定出模型的匹配参数.在此基础上,研究了不同进给方式(连续流与脉冲流)对膜面污染物的影响.模拟结果表明,当水流剪切力足以克服污染物的临界粘附力时,可对膜面污染物起冲刷作用;与连续流相比,脉冲流具有更高的有效剪切速率,在对膜面污染物的冲刷作用方面更具优势.

关键词：超滤计算流体力学膜污染变形几何临界粘附力

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Geometric regulation of collective cell tangential ordering migration

引用

Journal of Innovative Optical Health Sciences 2024年第2期17卷 94-103页

作者： Hao Dong Yuming Zhou Xuehe Ma junfang liu Fulin Xing Jianyu Yang Qiushuo Sun Qingsong Hu Fen Hu Leiting Pan Jingjun Xu The Key Laboratory of Weak-Light Nonlinear Photonics of Education Ministry School of Physics and TEDA Institute of Applied Physics Nankai University Tianjin 300071 P.R.China State Key Laboratory of Medicinal Chemical Biology Frontiers Science Center for Cell Responses College of Life Sciences Nankai University Tianjin 300071 P.R.China Shenzhen Research Institute of Nankai Uniwersity Shenzhen Guangdong 518083P.R.China Collaborative Innovation Center of Extreme Optics Shanxi University.Taiyuan Shanxi 030006P.R.China

Collective cell migration is a coordinated movement of multi-cell systems essential for various processes throughout *** collective motions often occur under spatial restrictions,hallmarked by the collective rotation of epithelial cells confined in circular ***,we aim to explore how geometric shapes of confinement regulate this collective cell *** develop quantitative methods for cell velocity orientation analysis,and find that boundary cells exhibit stronger tangential ordering migration than inner cells in circular ***,decreased tangential ordering movement capability of collective cells in triangular and square patterns are observed,due to the disturbance of cell motion at unsmooth corners of these *** the other hand,the collective cell rotation is slightly affected by a convex defect of the circular pattern,while almost hindered with a concave defect,also resulting from different smoothness features of their *** simulations employing cell Potts model well reproduce and extend experimental ***,our results highlight the importance of boundary smoothness in the regulation of collective cell tangential ordering migration.

关键词： Collective cell migration spatial restrictions tangential ordering geometric regula-tion cell Potts model

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：