检索结果-南通市图书馆

钢框架-混凝土筒体结构加固改造方案优选方法探究

在线全文

学校读者我要写书评

暂无评论

工程造价管理 2024年第4期35卷 80-84页

作者：李倩王松李霞王欣然中建研科技股份有限公司北京100013 中国建筑科学研究院有限公司北京100013

文章致力于优化钢框架-混凝土筒体结构的加固改造方案,以增强其安全性能,提升加固工程的质量。文章首先通过结构功能函数评估加固的必要性,然后选取永定楼消防与结构安全修缮工程作为案例,进行了全面的结构现状调查。基于调查结果,构建... 详细信息

文章致力于优化钢框架-混凝土筒体结构的加固改造方案,以增强其安全性能,提升加固工程的质量。文章首先通过结构功能函数评估加固的必要性,然后选取永定楼消防与结构安全修缮工程作为案例,进行了全面的结构现状调查。基于调查结果,构建了加固效费比模型,并发展了一套评价指标体系。利用TOPSIS方法对不同加固方案进行了综合评价,最终确定了最优的加固改造方案。该方案不仅在经济性、施工周期和后期维护费用方面具有明显优势,而且通过有限元分析验证了其在提升结构安全性和整体质量方面的显著效果。研究结果证实,本研究构建的评价和优选方法能够快速有效地选择出最优加固方案,降低施工成本,缩短工期,并确保加固工程的有效性和安全性。展望未来,应将继续探索更多新型加固技术和更先进的优化方法,以满足日益增长的工程需求,进一步提升加固改造工程的科学性和实用性。

关键词：钢结构钢框架-混凝土筒体结构加固改造方案 TOPSIS优选方法评价指标

Multivalent metal-sulfur batteries for green and cost-effective energy storage:Current status and challenges

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第1期31卷 144-165,I0005页

作者： Yue Yang Haoyi Yang xinran wang Ying Bai Chuan Wu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081China

Multivalent metal-sulfur(M-S,where M=Mg,Al,Ca,Zn,Fe,etc.)batteries offer unique opportunities to achieve high specific capacity,elemental abundancy and cost-effectiveness beyond lithium-ion batteries(LIBs).However,the slow diffusion of multivalent-metal ions and the shuttle of soluble polysulfide result in impoverished reversible capacity and limited cycle performance of M-S(Mg-S,Al-S,Ca-S,Zn-S,Fe-S,etc.)*** is a necessity to optimize the electrochemical performance,while deepening the understanding of the unique electrochemical reaction mechanism,such as the intrinsic multi-electron reaction process,polysulfides dissoluti on and the in stability of metal an *** solve these problems,we have summarized the state-of-the-art progress of current M-S batteries,and sorted out the existing challen ges for different multivalent M-S batteries according to sulfur cathode,electrolytes,metallic an ode and current collectors/separators,*** this literature,we have surveyed and exemplified the strategies developed for better M-S batteries to strengthen the application of green,cost-effective and high energy density M-S batteries.

关键词： Multivale nt metal-sulfur batteries Cost-effectiveness Green energy storage Shuttle effect Electrolyte

人为管护因素哑变量对行道树国槐胸径-树高模型精度的影响——以北京市中心城区为例

在线全文

学校读者我要写书评

暂无评论

中国城市林业 2024年第3期22卷 16-25页

作者：王欣冉孙妍徐程扬北京林业大学林学院城市林业研究所森林培育和保护教育部重点实验室北京100083

为明晰特大城市都市区城市树木人为管护因素对行道树国槐的胸径-树高关系的影响,拟构建以人为管护因素为哑变量的行道树国槐胸径-树高关系模型,根据2022年北京市中心城区行道树的抽样调查,取得685株行道树国槐的实测数据,结合文献中的1... 详细信息

为明晰特大城市都市区城市树木人为管护因素对行道树国槐的胸径-树高关系的影响,拟构建以人为管护因素为哑变量的行道树国槐胸径-树高关系模型,根据2022年北京市中心城区行道树的抽样调查,取得685株行道树国槐的实测数据,结合文献中的12个模型,通过决定系数(R2)、平均预估误差(MPE)、赤池信息准则(AIC)、均方根误差(RMSE)4个评价指标,筛选出最优基础模型,分析7种典型城市环境中的人为管护因素对行道树国槐胸径、树高的影响。结果表明:1)模型M2(R2=0.647,MPE=-2.241%,AIC=600.726,RMSE=1.683)综合拟合程度最优。2)地面防踩踏护网设置、建筑遮光和树池边长显著影响国槐胸径(P0.05)。3)在模型中引入代表地面防踩踏保护、树木涂白、建筑遮光和树池边长的哑变量后,模型精度明显提升,R2提升15.8%,MPE缩小29.5%,AIC值降低29.0%,RMSE值降低15.0%。因此,将人为管护因素作为哑变量引入国槐胸径-树高模型可以有效提高模型的拟合精度与适用性,可为未来行道树的科学栽植、管护以及碳储量评估等提供理论基础。

关键词：国槐行道树生长模型哑变量树干涂白保护地面防踩踏保护

维普期刊数据库博看期刊

Sulfone-based high-voltage electrolytes for high energy density rechargeable lithium batteries:Progress and perspective

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第4期32卷 1309-1315页

作者： Wenya Wu Ying Bai xinran wang Chuan Wu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

Further enhancement in the energy density of rechargeable lithium batteries calls for high-voltage cathode materials and stable anodes,as well as matched high-voltage electrolytes without compromising the overall property of ***-based electrolytes have aroused great interest in recent years owing to their wide electrochemical window and high ***,significant challenges such as the complexity of synthesis,high melting point(typically above room temperature),high viscosity,and their poor compatibility with graphite-based anodes have drastically impeded their practical *** this review,recent progress of sulfone solvents in high energy density rechargeable lithium batteries is summarized theoretically and *** importantly,general improvement methods of sulfone-based electrolytes,such as adding additives and cosolvents,structural modifications of sulfo ne,superconcentrated salt strategy are briefly *** expect that this review provides inspiration for the future developments of sulfone-based high-voltage electrolytes(SHVEs)and their widespread applications in high specific energy lithium batteries.

关键词： Lithium batteries High voltage High energy density Sulfone-based electrolytes Optimizations

Insight to defects regulation on sugarcane waste-derived hard carbon anode for sodium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第4期30卷 499-508页

作者： Kaihua Yu xinran wang Haoyi Yang Ying Bai Chuan Wu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081China

A great deal of attention has been paid on developing plant-derived hard carbon(HC)materials as anodes for sodium-ion batteries(SIBs).So far,the regulation of HC has been handicapped by the well-known ambiguity of Na^(+)storage mechanism,which fails to differentiate the Na^(+)adsorption and Na^(+)insertion,and their relationship with the size of d-interlayer spacing and structural ***,bagassederived HC materials have been synthesized through a combination of pyrolysis treatment and microwave *** combined protocol has enabled to synergistically control the d-interlayer spacing and ***,the microwave activation has created slit pores into HC and these pores allow for an enhanced Na^(+)adsorption with an increased sloping capacity,establishing a strong correlation between the porosity and sloping ***,the pyrolysis treatment promotes the graphitization and it contributes to an intensified Na^(+)insertion with an increased plateau capacity,proving that the plateau capacity is largely contributed by the Na^(+)insertion between ***,the structural regulation of bagasse-derived HC has provided a proof on positively explaining the Na^(+)storage with HC *** structural changes in the pore size distribution,specific surface area,d-interlayer spacing,and the electrochemical properties have been comprehensively characterized,all supporting our understanding of Na^(+)storage *** a result,the HC sample with an optimized d-interlayer spacing and porosity has delivered an improved reversible capacity of 323.6 m Ah g^(-1) at 50 m A g^(-1).This work provides an understanding of Na^(+)storage mechanism and insights on enhancing the sloping/plateau capacity by rationally regulating the graphitization and porosity of HC materials for advanced SIBs.

关键词： Hard carbon Sodium-ion batteries Microwave activation Sodium storage mechanism

A scalable sulfuration of WS2 to improve cyclability and capability of lithium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Nano Research 2016年第3期9卷 857-865页

作者： Liyan Zhou Shancheng Yan Lijia Pan xinran wang Yuqiao wang Yi Shi ing University Nanjing 210093 China School of Geography and Biological Information Nanjing University of Posts and Telecommunications Nanjing 210023 China National Laboratory of Solid State Microstructures School of Electronic Science and Engineering Nanjing University Nanjing 210093 China Jiangsu Optoelectronic Functional Materials and Engineering Laboratory School of Chemistry and Chemical Engineering Southeast University Nanjing 211189 China

Two-dimensional transition-metal dichalcogenides （WS2 and SnS2） have recently joined the family of energy storage materials （for lithium-ion batteries and supercapacitors） as a result of their favorable ion intercalation. So far, challenges in the synthesis of phase-pure WS2, restacking between WS2 nanosheets, low electronic conductivity, and the brittle nature of WS2, severely limit its use Li-ion battery application. Herein, we develop a facile low temperature solution sulfuration process to improve battery performance dramatically. The sulfuration process is demonstrated to be effective in converting WO3 impurities to WS2, and in repairing the sulfur vacancies, to improve cyclability and rate capability. Lithium-ion battery measurements demonstrate that the stable capacity of the WS2 anode could be enhanced by 48.4% via sulfuration reprocessing, i.e., from 381.7 to 566.8 rnAh/g at a relatively high current density of 0.8 A/g after 50 cycles. We further show that the sulfuration process can be readily extended to other dichalcogenides, and may provide a class of versatile electrode materials for lithium-ion batteries with improved electrochemical characteristics.

关键词： lithium-ion batteries tungsten disulfide sulfuration process anode

Design strategies for two-dimensional material photodetectors to enhance device performance

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

InfoMat 2019年第1期1卷 33-53页

作者： Jun wang Jiayue Han Xiaoqing Chen xinran wang School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengduP.R.China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengduP.R.China School of Microelectronics Xidian UniversityXianChina National Laboratory of Solid State Microstructures School of Electronic Science and Engineeringand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjingChina

Two-dimensional(2D)materials are intensively attractive for fabricating high sensitive photodetectors in terms of atomically thin flexible and ultrafast charge transport *** to their atomically thin body,designing high performance detector requires new physical mechanisms and device *** this review,we classify design strategies and device structures into four categories depending on their physical mechanisms(photovoltaic effect,photoconductive effect,photothermoelectric effect or photobolometric effect,and surface plasma-wave-assisted effect),and summarize the device ***,future prospects and development direction for 2D material photodetectors are *** design strategies descriptions about photoelectronic detector provide a reference for high responsivity and fast response speed photodetector at broadband sensing in the future.

关键词： design strategy heterostructure organic materials photodetectors two-dimensional materials

Micro-expression recognition algorithm based on the combination of spatial and temporal domains

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

High Technology Letters 2021年第3期27卷 303-309页

作者： Wu Jin Xi Meng Dai Wei wang Lei wang xinran School of Electronic and Engineering Xi’an University of Posts and TelecommunicationsXi'an 710121P.R.China

Aiming at the problem of unsatisfactory effects of traditional micro-expression recognition algorithms,an efficient micro-expression recognition algorithm is proposed,which uses convolutional neural networks(CNN)to extract spatial features of micro-expressions,and long short-term memory network(LSTM)to extract time domain *** and LSTM are combined as the basis of micro-expression *** many CNN structures,the visual geometry group(VGG)using a small convolution kernel is finally selected as the pre-network through *** to the difficulty of deep learning training and over-fitting,the dropout method and batch normalization method are used to solve the problem in the VGG *** data sets CASME and CASME II are used for test comparison,in order to solve the problem of insufficient data sets,randomly determine the starting frame,and a fixedlength frame sequence is used as the standard,and repeatedly read all sample frames of the entire data set to achieve trayersal and data ***.a hieh recognition rate of 67.48% is achieved.

关键词： micro-expression recognition convolutional neural network(CNN) long short-term memory(LSTM) batch normalization algorithm dropout

智慧水务在朝阳区水系连通工程中应用设计初探

在线全文

学校读者我要写书评

暂无评论

水资源开发与管理 2024年第4期10卷 71-75页

作者：王昕然金宝光崔伊彤北京市朝阳区水务局北京100025

朝阳区水系连通工程利用引、调、自流等方式将朝阳区38条河流进行了物理连通,形成了地表河网,并研究了河流生态流量、防洪等不同目标的河网水系调度方案。为了高效利用朝阳区水系连通工程,更好地实现工程效益,直观展示河流闸坝泵站工作... 详细信息

朝阳区水系连通工程利用引、调、自流等方式将朝阳区38条河流进行了物理连通,形成了地表河网,并研究了河流生态流量、防洪等不同目标的河网水系调度方案。为了高效利用朝阳区水系连通工程,更好地实现工程效益,直观展示河流闸坝泵站工作,以及不同调度方案下河流工况和水情,本文探讨了智慧水务系统平台在水系连通工程中的应用,初步设计了与水系连通工程运行调度相关的板块展示内容,是使用智慧水务信息化系统对河流水系硬件调度和管理的有益探索,为下一步河流生态化管护工作构建了相关指标体系。

关键词：智慧水务水系连通工程软件内容设计