检索结果-南通市图书馆

Synergistic protection of Si anode based on multi-dimensional graphitic carbon skeletons

Nano Research 2022年第9期15卷 8146-8155页

作者： qitao shi Haiming Wang Junhua Zhou HuyQuang Ta Jiaqi Wang Xueyu Lian Klaudia Kurtyka Barbara Trzebicka Thomas Gemming Mark H.Rümmeli Soochow Institute for Energy and Materials Innovation College of EnergyKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006China Institute for Complex Materials IFW Dresden20 Helmholtz StrasseDresden 01069Germany Centre of Polymer and Carbon Materials Polish Academy of SciencesM.Curie-Sklodowskiej 34Zabrze 41-819Poland Thomas Gemming-Institute of Environmental Technology VSB-Technical University of Ostrava17.Listopadu 15Ostrava 70833Czech Republic

Inspired by the natural corn structure,a Si@hollow graphene shell@graphene(Si@GS@G)anode material was prepared in which silicon nanoparticles were preliminarily anchored onto the surface of an elastic graphene shell and further constrained using graphene *** graphene oxide shells with abundant surficial hydrogen bonds,which were synthesized using a novel bottom-up method,were used as an intermediate material to anchor positively charged silicon nanoparticles via electrostatic attraction and achieve a rational spatial *** inner hollow graphene shell anchorage and outer graphene constraint synergistically constituted a porous and robust conductive corn-like *** as-fabricated Si@GS@G anode afforded efficient electron and ion transport pathways and improved structural stability,thereby enhancing Li+storage capability(505 mAh·g^(−1)at 10 A·g^(−1))and extending the lifespan compared to the single hollow graphene shell or graphene sheet-protected Si anode(72%capacity retention after 500 cycles).The improved kinetics of the Si@GS@G anode were investigated using electro impedance spectroscopy,galvanostatic intermittent titration,and pseudocapacitance contribution rate analysis,and the structural evolution was analyzed using ex situ electron *** study proposes a novel hollow graphene oxide shell as an activated intermediate material for designing a porous electrode structure that facilitates an enhanced electrochemical performance.

关键词： synergistic protection multi-dimensional graphitic carbons corn-like structure elastic skeleton Si/C anode

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

Placement Strategy for Replicated Servers in CDN

Placement Strategy for Replicated Servers in CDN

引用

第37届中国控制会议

作者： qitao shi Xiaofan Wang Wang Lin Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China

Study of Content Distribution Networks（CDNs） attracts increasing attentions recently. Deploying a set of servers across the Internet containing replicated content will certainly provide users with better experience by reducing request latency and balancing the load. However, due to the large-scale and high-volume requests from the users, quantities of proxy servers are needed resulting in high cost of facilities. Therefore, it is necessary to find an optimal replicated-server placement that can improve Internet performance while controlling the budget. To solve this problem, we first propose a new model, CF LP EC,based on which the nature of Internet can be described. In addition, we analyze the feasibility and compare several lower bound algorithms of the new model. Based on CF LP EC, we testify the performance of the network-segmentation algorithm. The proposed algorithm uses K-means algorithm to cluster the network and for each cluster, greedy algorithm is applied to find out an approximate placement in this area. As we obtain the solutions for all the clusters respectively, we merge them to constitute the final solution for the whole network. Instead of directly stitching them together, possible situations that will occur on the boundaries between two clusters are also taken into consideration. Finally, we learn from the natural characteristics of the Internet to construct the simulation model, and simulation results illustrate the feasibility and effectiveness of the proposed algorithm.

关键词： Web replica placement algorithm content distribution network(CDN) network segmentation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Direct synthesis of large-area Al-doped graphene by chemical vapor deposition:Advancing the substitutionally doped graphene family

引用

Nano Research 2022年第2期15卷 1310-1318页

作者： Sami Ullah Yu Liu Maria Hasan Wenwen Zeng qitao shi Xiaoqin Yang Lei Fu Huy Q.Ta Xueyu Lian Jingyu Sun Ruizhi Yang Lijun Liu Mark H.Rummeli College of Energy Soochow Institute for Energy and Materials Innovations Soochow UniversitySuzhou 215006China Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow UniversitySuzhou 215006China NUTECH School of Applied Sciences&Humanities and Computer Engineering Department National University of TechnologyIslamabad 42000Pakistan Centre of Polymer and Carbon Materials Polish Academy of SciencesM.Curie-Sklodowskiej 34Zabrze 41-819Poland School of Energy and Power Engineering Xian Jiaotong UniversityXian 710049China College of Chemistry and Molecular Science Wuhan UniversityWuhan 430072China Institute for Complex Materials IFW Dresden 20 Helmholtz Strasse Dresden 01069Germany Institute of Environmental Technology VSB-Technical University of Ostrava17.listopadu 15Ostrava 70833Czech Republic

Graphene doping continues to gather momentum because it enables graphene properties to be tuned,thereby affording new properties to,improve the performance of,and expand the application potential of *** can be chemically doped using various methods such as surface functionalization,hybrid composites(e.g.,nanoparticle decoration),and substitution doping,wherein C atoms are replaced by foreign ones in the graphene *** works have predicted that graphene could be substitutionally doped by aluminum(Al)atoms,which could hold promise for exciting applications,including hydrogen storage and evolution,and *** theoretical predictions suggest that Al substitutionally doped graphene(AIG)could serve as a material for gas sensors and the catalytic decomposition of undesirable ***,fabricating Al substitutionally doped graphene has proven challenging until ***,we demonstrate how controlled-flow chemical vapor deposition(CVD)implementing a simple solid precursor can yield high-quality and large-area monolayer AIG,and this synthesis is unequivocally confirmed using various characterization methods including local electron energy-loss spectroscopy(EELS).Detailed high-resolution transmission electron microscopy(HRTEM)shows numerous bonding configurations between the Al atoms and the graphene lattice,some of which are not theoretically ***,the produced AIG shows a CO_(2) capturability superior to those of other substitutionally doped graphenes.

关键词： aluminum-doped graphene single-solid precursor chemical vapor deposition carbon dioxide capture energy storage catalytic applications

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

In-situ observations of novel single-atom thick 2D tin membranes embedded in graphene

引用

Nano Research 2021年第3期14卷 747-753页

作者： Xiaoqin Yang Huy Q.Ta Wei Li Rafael G.Mendes Yu Liu qitao shi Sami Ullah Alicja Bachmatiuk Jinping Luo Lijun Liu Jin-Ho Choi Mark H.Rummeli School of Energy and Power Engineering Xi’an Jiaotong UniversityNo.28Xianning West RoadXian710049China

There is ongoing research in freestanding single-atom thick elemental metal patches,including those suspended in a two-dimensional(2D)material,due to their utility in providing new structural and energetic insight into novel metallic 2D *** pores have shown promise as support systems for suspending such *** study explores the potential of Sn atoms to form freestanding stanene and/or Sn patches in graphene *** atoms were deposited on graphene,where they formed novel single-atom thick 2D planar clusters/patches(or membranes)ranging from 1 to 8 atoms within the graphene *** of three or more atoms adopted either a star-like or close-packed structural *** functional theory(DFT)calculations were conducted to look at the cluster configurations and energetics(without the graphene matrix)and were found to deviate from experimental observations for 2D patches larger than five *** was attributed to interfacial interactions between the graphene pore edges and Sn *** presented findings help advance the development of single-atom thick 2D elemental metal membranes.

关键词： in-situ transmission electron microscopy Sn atoms planar cluster graphene vacancy

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

Enhanced performance of Si-based Li-ion batteries through elastic cushioning with hollow graphene shells

引用

Science China Materials 2022年第9期65卷 2343-2353页

作者： qitao shi Weibin Ye Klaudia Kurtyka Haiming Wang Xueyu Lian Huy Quang Ta Junhua Zhou Xiaoqin Yang Lingli Guo Barbara Trzebicka Jingyu Sun Lijun Liu Ming-Sheng Wang Mark H.Rummeli Soochow Institute for Energy and Materials Innovation College of EnergyKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006China State Key Lab of Physical Chemistry of Solid Surfaces College of MaterialsXiamen UniversityXiamen 361005China Centre of Polymer and Carbon Materials Polish Academy of SciencesM.Curie-Sklodowskiej 34Zabrze 41-819Poland Institute for Complex Materials IFW DresdenDresden 01069Germany School of Energy and Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Institute of Environmental Technology VSB-Technical University of Ostrava17.Listopadu 15Ostrava 70833Czech Republic

Silicon(Si)is a promising anode material for next-generation Li-ion *** nanometer-sized Si could alleviate the pulverization caused by large volume changes during deep ***,compression between agglomerated Si particles causes Si cracking and electrode *** this,we engineered a mechanical cushioning space between Si particles via elastic hollow graphene shells(GSs)to flexibly buffer volume changes and maintain the stability of the electrode *** stress generated from the Si volume expansion during lithiation was mechanically buffered and gently released by compression of the hollow space of the *** this Si/GS composite electrode,GS also reduced the local agglomeration of Si particles and effectively improved the overall *** these advantages,the designed Si/GS electrode showed an enhanced cycling performance with more than 1200 mA h g^(-1) at 0.8 A g^(-1) and an excellent rate capability of 1025 mA h g^(-1) at 4 A g^(-1) after 200 cycles.

关键词： Si/C composite electrode mechanical cushion elastic hollow GSs

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

气分装置塔底热源优化

引用

山东化工 2020年第7期49卷 112-113页

作者：时启涛陆聪郭栋荆举祥山东三维石化工程股份有限公司山东淄博255434

本项目以某炼油厂气分装置为例,利用热媒水、催化顶循油为气分装置再沸器提供热源,降低气分装置的蒸汽消耗,达到节能的目的,同时对于新建和改造项目具有参考价值。文章主要介绍工艺流程的确定,以及再沸器选型及配管。

关键词：再沸器热媒水催化顶循油

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

悬浮于石墨烯空位/孔洞中的独立纳米结构

引用

Science China Materials 2023年第1期66卷 35-50页

作者：刘玉 Huy Q Ta 杨晓琴张月周军华施启涛曾梦琪 Thomas Gemming Barbara Trzebicka 付磊 Mark H.Rümmeli Soochow Institute for Energy and Materials Innovations College of PhysicsOptoelectronics and EnergyCollaborative Innovation Center of Suzhou Nano Science and TechnologyKey Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006China IFW Dresden P.O.Box D-01171 DresdenGermany Gusu Laboratory of Materials Suzhou 215123China Leibniz Institute for Solid State and Materials Research Dresden P.O.Box 270116D-01171 DresdenGermany Centre of Polymer and Carbon Materials Polish Academy of SciencesM.Curie-Sklodowskiej 34Zabrze 41-819Poland Institute of Environmental Technology VSB-Technical University of Ostrava17.Listopadu 15Ostrava70833Czech Republic College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China

在电子束辐照下,石墨烯较易形成空位、孔洞等缺陷,从而捕获外来原子,形成新的结构.由于这些结构具有一些令人兴奋的性质,它们和石墨烯之间的相互作用引起了科研工作者相当大的研究兴趣.本文总结了利用透射电子显微镜在制备和表征悬浮在... 详细信息

在电子束辐照下,石墨烯较易形成空位、孔洞等缺陷,从而捕获外来原子,形成新的结构.由于这些结构具有一些令人兴奋的性质,它们和石墨烯之间的相互作用引起了科研工作者相当大的研究兴趣.本文总结了利用透射电子显微镜在制备和表征悬浮在石墨烯中的独立纳米结构的方法,以及原子分辨率下观察到的此类材料中原子/结构的动态行为过程,讨论了新型金属/非金属掺杂剂对具有不同键结构的石墨烯空位的影响,以及位于石墨烯边缘的单原子/团簇的催化活性.此外,还讨论了独立单原子厚二维团簇/金属/金属烯和二维团簇/金属/金属烯氧化物的动态形成过程.并指出这些纳米结构的形成、稳定性和宏观效应对于新的原子/分子尺度纳米技术的实际应用至关重要.以上数据证实了新型纳米结构的数量不断增加,并预示着相关研究的不断深入.

关键词：纳米结构透射电子显微镜纳米技术键结构石墨烯单原子电子束辐照分子尺度

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

Connecting sources, fractions and algal availability of sediment phosphorus in shallow lakes:An approach to the criteria for sediment phosphorus concentrations

引用

Journal of Environmental Sciences 2023年第3期125卷 798-810页

作者： Jin Zhang shijiao Buyang qitao Yi Peiyao Deng Wei Huang Cheng Chen Wenqing shi School of Civil Engineering Yantai UniversityYantai 264005China School of Earth and Environment Anhui University of Science and TechnologyHuainan 232001China Nanjing Institute of Geography&Limnology Chinese Academy of SciencesNanjing 210008China Center for Eco-Environmental Research Nanjing Hydraulic Research InstituteNanjing 210098China School of Environmental Science and Engineering Nanjing University of Information Science&TechnologyNanjing 210044China

Although point and nonpoint sources contribute roughly equal nutrient loads to lakes,their relative role in supporting algae growth has not been clarified. In this research, we have established a quantitative relationship between algae-available phosphorus(P) and P chemical fractions in sediments;the latter indicates the relative contribution of point versus nonpoint sources. Surface sediments from three large shallow lakes in eastern China, namely, the Chaohu, Taihu and Hongzehu Lakes, were sampled to assess their algaeavailable P and chemically extracted P fractions. The algae-available P primarily comes from iron/aluminium(hydr)oxide-bound P(Fe/Al-bound P), 45% of which is algae-available P. The ratio of Fe/Al-bound P to calcium compound-bound P(Ca-bound P) indicated the relative contribution of point to nonpoint sources, with the point sources contributing the majority of increased Fe/Al-bound P in sediments. Therefore, the reduction of point sources from urbanized areas, rather than nonpoint sources from agricultural areas that primarily contribute to the Ca-bound P fraction, should be prioritized to alleviate cyanobacterial algal blooms(CyanoHABs) in shallow lakes with sediment P as a potential source to support algae growth. With these important results, we proposed a conceptual model for “P-pumping suction” from sediments to algae to aid in the development of the criteria for sediment P concentrations in shallow lakes.

关键词： Algae-available phosphorus Bioassay Phosphorous fractionation Eutrophication Criteria for sediment P concentrations

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

拖拉机主离合器从动盘摩擦钢片断裂仿真分析及改进

引用

拖拉机与农用运输车 2024年第2期51卷 88-91页

作者：胡豪张静黄娟赵亚燊杨倩雯时启涛洛阳西苑车辆与动力检验所有限公司河南洛阳471039 一拖(洛阳)汇德工装有限公司河南洛阳471003 第一拖拉机股份有限公司制造工程中心河南洛阳471004 湖北三智农业机械检测有限公司湖北京山431800

拖拉机主离合器位于发动机与变速箱之间,用来分离或结合前后两者之间的动力。针对试验过程中发现的离合器从动盘摩擦钢片断裂现象进行仿真分析,通过对不同的结构改进进行模拟分析,总结出拖拉机主离合器从动盘摩擦钢片改进方向。

关键词：拖拉机离合器摩擦钢片仿真分析

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

碳纳米管提升氧化亚硅负极稳定性的起源

引用

Science China Materials 2023年第9期66卷 3461-3467页

作者：周军华王佳琪施启涛连雪玉刘玉刘立军 Alicja Bachmatiuk 孙靖宇杨瑞枝 Jin-Ho Choi Mark H.Rümmeli College of Energy Soochow Institute for Energy and Materials Innovations(SIEMIS)Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow UniversitySuzhou 215006China School of Energy and Power Engineering Xi’an Jiaotong UniversityXi’an 710049China LUKASIEWICZ Research Network PORT Polish Center for Technology DevelopmentStablowicka 147Wroclaw 54-066Poland Beijing Graphene Institute(BGI) Beijing 100095China Leibniz Institute for Solid State and Materials Research Dresden P.O.Box 270116D-01171 DresdenGermany Centre of Polymer and Carbon Materials Polish Academy of SciencesM.Curie-Sklodowskiej 34Zabrze 41-819Poland Institute of Environmental Technology VSB-Technical University of Ostrava17.Listopadu 15Ostrava70833Czech Republic

高容量的SiO (SO)合金基材料是最有希望的下一代锂离子电池负极之一.使用碳纳米管(CNTs)导电添加剂,虽然可以有效地解决SO较差的循环寿命这一难题,然而除了动力学因素之外,其它潜在的作用机理目前仍不明确.在本工作中,一系列的测试结果... 详细信息

高容量的SiO (SO)合金基材料是最有希望的下一代锂离子电池负极之一.使用碳纳米管(CNTs)导电添加剂,虽然可以有效地解决SO较差的循环寿命这一难题,然而除了动力学因素之外,其它潜在的作用机理目前仍不明确.在本工作中,一系列的测试结果表明CNTs可以使电极在循环后依然维持完整的导电网络,确保均匀的电化学反应.CNTs也使得电极局部的体积膨胀得到了抑制,从而避免了固态电解质界面的不断生长,活性材料从集流体剥离,甚至析锂.得益于CNTs的上述作用, SO-CNTs负极在0.5 C (1 C=1600 mA g^(-1))下可以稳定循环200次,其容量保持率为96.2%. CNTs的作用机理也进一步地在商业化的SO/石墨复合负极(SO650-CNTs, 1 C=650 mA g^(-1))中得到了验证,SO650-CNTs在1 C下循环400次后容量保持率为80.6%.本工作为导电添加剂的作用机理提出了新的见解,并将有助于加速合金类负极的商业化进程.

关键词：导电添加剂固态电解质电化学反应动力学因素活性材料体积膨胀硅负极导电网络

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

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：