检索结果-南通市图书馆

A surface engineering strategy for the stabilization of zinc metal anodes with montmorillonite layers toward long-life rechargeable aqueous zinc ion batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 94-105页

作者： Wenbo Wang Ruifeng Xu Xu Zhang Peiyu Wang Bao Yang Bingjun Yang Juan Yang Kailimai Su Pengjun Ma Yanan deng Xianfeng Fan Wanjun Chen Key Laboratory for Electronic Materials College of Electrical Engineering Northwest Minzu University Resource Chemistry and Energy Materials Research Center State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Institute for Materials and Processes School of Engineering University of Edinburgh

Rechargeable aqueous zinc-ion batteries （AZIBs） exhibit appreciable potential in the domain of electrochemical energy ***,there are serious challenges for AZIBs,for instance zinc dendrite growth,hydrogen evolution reaction （HER）,and corrosion side ***,we propose a surface engineering modification strategy for coating the montmorillonite （MMT） layer onto the surface of the Zn anode to tackle these issues,thereby achieving high cycling stability for rechargeable *** results reveal that the MMT layer on the surface of the Zn anode is able to provide ordered zincophilic channels for zinc ions migration,facilitating the reaction kinetics of zinc *** functional theory（DFT） calculations and water contact angle （CA） tests prove that MMT@Zn anode exhibits superior adsorption capacity for Zn2+and better hydrophobicity than the bare Zn anode,thereby achieving excellent cycling ***,the MMT@Zn||MMT@Zn symmetric cell holds the stable cycling over 5600 h at 0.5 mA cm-2and 0.125 m A h cm-2,even exceeding 1800 h long cycling under harsh conditions of 5 m A cm-2and 1.25 m A h *** MMT@Zn||V2O5full cell reaches over 3000 cycles at 2 A g-1with excellent rate ***,this surface engineering modification strategy for enhancing the electrochemical performance of AZIBs represents a promising application.

关键词： Hydrogen evolution reaction

Effects of synthesis methods on catalytic activities of CoOx–TiO2 for low-temperature NH3-SCR of NO

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第4期29卷 277-287页

作者： li zhu Yiqing Zeng Shule Zhang Jinli deng Qin Zhong School of Chemical Engineering Nanjing University of Science and Technology

A series of cobalt doped TiO2（Co-TiO2） and Co Oxloaded TiO2（Co/TiO2） catalysts prepared by sol–gel and impregnation methods respectively were investigated on selective catalytic reduction with NH3（NH3-SCR） of NO. It was found that Co-TiO2 catalyst showed more preferable catalytic activity at low temperature range. From characterization results of XRD,TEM, Raman and FT-IR, Co species were proved to be doped into TiO2 lattice by replaced Ti atoms. After being characterized and analyzed by NH3-TPD, PL, XPS, EPR and DRIFTS, it was found that the better NH3-SCR activities of Co-TiO2 catalysts, compared with Co/TiO2 catalyst, were ascribed to the formation of more oxygen vacancies which further promoted the production of more superoxide ions（O-2）. The superoxide ions were crucial for the formation of low temperature SCR reaction intermediates（NO-3） by reacting with adsorbed NO molecule. Therefore, these aspects were responsible for the higher low temperature NH3-SCR activity of Co-TiO2 catalysts.

关键词： NH3-SCR CoOx–TiO2 catalysts Oxygen vacancies Superoxide ions

An intelligent market making strategy in algorithmic trading

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2014年第4期8卷 596-608页

作者： Xiaodong li Xiaotie deng Shanfeng zhu Feng WANG Haoran XIE Department of Computer Science City University of Hong Kong Hong Kong China AIMS Lab Department of Computer Science and Engineering Shanghai Jiaotong University Shanghai 200240 China Shanghai Key Lab of Intelligent Information Processing Fudan University Shanghai 200433 China School of Computer Science Fudan University Shanghai 200433 China State Key Lab of Software Engineering School of Computer Science Wuhan University Wuhan 430072 China Department of Computer Science Hong Kong Baptist University Hong Kong China

Market making （MM） strategies have played an important role in the electronic stock market. However, the MM strategies without any forecasting power are not safe while trading. In this paper, we design and implement a twotier framework, which includes a trading signal generator based on a supervised learning approach and an event-driven MM strategy. The proposed generator incorporates the information within order book microstructure and market news to provide directional predictions. The MM strategy in the second tier trades on the signals and prevents itself from profit loss led by market trending. Using half a year price tick data from Tokyo Stock Exchange （TSE） and Shanghai Stock Exchange （SSE）, and corresponding Thomson Reuters news of the same time period, we conduct the back-testing and simulation on an industrial near-to-reality simulator. From the empirical results, we find that 1） strategies with signals perform better than strategies without any signal in terms of average daily profit and loss （PnL） and sharpe ratio （SR）, and 2） correct predictions do help MM strategies readjust their quoting along with market trending, which avoids the strategies triggering stop loss procedure that further realizes the paper loss.

关键词： algorithmic trading market making strategy or- der book microstructure news impact analysis market simulation

Model tests on interaction between soil and geosynthetics subjected to localized subsidence in landfills

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

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第6期13卷 433-444页

作者： Bin zhu deng GAO Jun-chao li Yun-min CHEN MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Department of Civil EngineeringZhejiang UniversityHangzhou 310058China

In a landfill, excessive tensile strains or failure of the liner system due to localized subsidence underneath the geosynthetic liner, is a concern in design and operation of the landfill. The localized subsidence can be commonly withstood by reinforcements such as geogrids. A total of nine model tests were carried out to study the influence of soil arching in overburden sandy soil on the geosynthetics and the interaction between the soil and the geosynthetics. The localized subsidence was modeled by a strip trapdoor under the geosynthetic reinforcements. The reinforcement includes several layers of polyvinylchlorid （PVC） membrane or both PVC membrane and a compacted clay layer. Test results show that the vertical soil pressure acting on the geosynthetics within the subsidence zone is strongly related to the deflection of the geosynthefics. The soil pressure acting on the deflected geosynthetics will decrease to a minimum value with respect to its deflection if the final deflection is large enough, and this minimum value is almost independent of the overburden height. Otherwise, the deflection of geosynthetics cannot result in a full degree of soil arching, and the soil pressure within the subsidence zone increases with the increase of overburden height. Deflections and strains of the geosynthetics obviously decrease with the increase of their tensile stiffness. The presence of a compacted clay layer buffer can therefore reduce both deflections and strains of the geosynthetics. Finally, a composite liner structure is recommended for landfills to withstand the localized subsidences.

关键词： Landfill Soil arching Trapdoor Model test Geosynthetics

A review of updated S-scheme heterojunction photocatalysts

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第10期177卷 142-180页

作者： Fangyi li Guihua zhu Jizhou Jiang Lang Yang Fengxia deng Arramel Xin li School of Environmental Ecology and Biological Engineering Key Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationNovel Catalytic Materials of Hubei Engineering Research CenterWuhan Institute of TechnologyWuhan 430205China National Engineering and Technology Research Center for Development&Utilization of Phosphate Resources Kunming 650600China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Nano Center Indonesia Jalan Raya PUSPIPTEKSouth TangerangBanten 15314Indonesia Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642China

Photocatalysis is a green and environmentally-friendly process that utilizes the ubiquitous intermittent *** date,an emerging S-scheme heterojunction across the intimately coupled heterojunction materials is proposed to surpass the efficiency of conventional Ⅱ-type and Z-type ***-more,S-scheme heterojunction photocatalysts with greatly improved photocatalytic performance have gained significant attention due to their fast charge carriers separation along with strong redox ability and stability,since its proposal in ***,a timely and comprehensive review is highly desired to cover the state-of-the-art *** by this idea,the review conveys the recent progress and provides new insights into further *** the conventional method,in this review,we im-plement a quantification model to outline current trends in S-scheme heterojunctions research as well as their *** overview begins with the fundamentals of four basic photocatalytic mechanisms,followed by its design ***,diverse characterization techniques used in the S-scheme heterojunctions are systematically summarized along with the modification strategies to boost photocat-alytic ***,the internal reaction mechanism and emerging applications have been reviewed,including water conversion,CO_(2) remediation,wastewater treatment,H_(2)0_(2) production,N_(2) fix-ation,*** sum up the review,we present several current challenges and future prospects of the S-scheme heterojunctions photocatalysts,aiming to provide indispensable platforms for the future smart design of photocatalysts.

关键词： S-scheme heterojunctions Photocatalysts Modification strategies Charge separation mechanism

Ca2+ cation-mediated microenvironment for electrochemical hydrodimerization of furfural

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

Science China Chemistry 2025年

作者： Wei Du Shuangshuang Cha Can Lei Mengxin Qu Zhongqiang deng Ming Gong Xinhe Bao Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University State Key Laboratory of Catalysis National Laboratory for Clean Energy Collaborative Innovation Center of Chemistry for Energy Materials Dalian Institute of Chemical Physics Chinese Academy of Sciences

Furfural is one of the most important biomass-based platform molecules as sustainable precursors for chemicals and fuels. The electrochemical hydrodimerization of furfural can generate hydrofuroin, which is a promising precursor for gasoline or jet ***, steering the selectivity toward hydrodimerization under near-neutral conditions that suppress polymerization and disproportionation of furfural remains challenging. Herein, we discovered that tuning the electrolyte cations could be an effective and alternative strategy for modulating furfural reduction to the traditional electrocatalyst design. Under the optimal Ca2+cations,hydrofuroin yield could be much improved from other cations with hydrofuroin selectivity of 95.5%. The systematic characterization of the ion-centered double layer reflected the suitable sizes and charges of hydrated Ca2+for suppressing the hydrogen evolution reaction from activation of surrounding water molecules as well as encouraging furfural accumulation via non-covalent interaction for directing the electron transfer to furfurals. Ions with smaller or larger sizes can either activate local water molecules or form a crowded ionic interface that casts an adverse effect on furfural enrichment. This work not only presents an effective strategy for facilitating biomass valorization via hydrodimerization but also emphasizes the essential role of the ion-centered microenvironment for steering the electrocatalytic pathways.

关键词：

羽扇豆醇靶向CDC25A对肺腺癌细胞增殖、迁移和侵袭的影响

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

医学分子生物学杂志 2025年第1期22卷 16-22页

作者：朱叶新邓梨平湖南中医药大学第一附属医院肿瘤介入科长沙市410004

目的分析羽扇豆醇靶向细胞分裂周期蛋白25(CDC25A)抑制肺腺癌细胞增殖、迁移和侵袭等生物行为的作用机制。方法数据库分析羽扇豆醇靶点及其与肺腺癌临床表型等的相关性。将A549和Calu-3细胞分为对照组、羽扇豆醇组、vector组、羽扇豆醇+... 详细信息

目的分析羽扇豆醇靶向细胞分裂周期蛋白25(CDC25A)抑制肺腺癌细胞增殖、迁移和侵袭等生物行为的作用机制。方法数据库分析羽扇豆醇靶点及其与肺腺癌临床表型等的相关性。将A549和Calu-3细胞分为对照组、羽扇豆醇组、vector组、羽扇豆醇+vector组、沉默组和羽扇豆醇+沉默组,分别检测细胞活性、迁移和侵袭。构建肺腺癌裸鼠移植瘤模型,观察羽扇豆醇对移植瘤体积、重量及增殖细胞核抗原(Ki67)和CDC25A蛋白表达的影响。蛋白质印迹检测CDC25A蛋白表达与羽扇豆醇浓度和作用时间关系。结果数据库分析CDC25A基因可能为羽扇豆醇靶点之一,且CDC25A蛋白表达水平与肺腺癌进展密切相关。羽扇豆醇浓度越高,肺腺癌细胞A549和Calu-3细胞生存率和细胞克隆数明显降低(P<0.05)。羽扇豆醇组肺腺癌细胞迁移和侵袭数明显低于对照组(P<0.05);羽扇豆醇组的移植瘤组织体积和质量,Ki67和CDC25A蛋白表达均明显少于对照组(P<0.05)。CDC25A蛋白表达在羽扇豆醇作用时间增加或羽扇豆醇作用浓度升高时明显下降(P<0.05)。羽扇豆醇+空白组、沉默组和羽扇豆醇+沉默组A549和Calu-3细胞中CDC25A蛋白表达水平、细胞活性、细胞克隆数、细胞迁移侵袭数明显低于vector组(P<0.05)。结论羽扇豆醇通过下调CDC25A蛋白表达,进一步抑制肺腺癌细胞恶性行为。

关键词：羽扇豆醇肺腺癌细胞增殖细胞迁移细胞侵袭

面向远程内存图数据库的应用感知分离式存储设计

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

计算机科学 2025年第1期52卷 151-159页

作者：李纯羽邓龙李永坤许胤龙中国科学技术大学计算机科学与技术学院合肥230026 高性能计算安徽省重点实验室合肥230026

图数据在各种应用中日益普及,其因涵盖多种实体类型和存在丰富的关联关系而备受关注.对于图数据库用户而言,高效的图查询服务是保障系统性能的关键因素.随着数据量增加,单机图数据库很难满足将所有数据存储在内存中的需求,而分布式图数... 详细信息

图数据在各种应用中日益普及,其因涵盖多种实体类型和存在丰富的关联关系而备受关注.对于图数据库用户而言,高效的图查询服务是保障系统性能的关键因素.随着数据量增加,单机图数据库很难满足将所有数据存储在内存中的需求,而分布式图数据库在拓展性和资源利用率方面受到挑战.基于RDMA的远程内存系统的引入为克服这些挑战提供了一种新的选择,通过分离计算和存储资源,实现了更为灵活的内存使用方式.然而,在使用远程内存的情况下如何最大程度地优化图查询性能成为了当前研究的重点问题.文中首先分析了利用操作系统分页机制透明使用远程内存构建图数据库存在的问题,并在应用层次上设计了远程内存图数据库的存储模型.根据不同数据的特点和访问模式,设计了属性图在远程内存中的存储结构,优化了数据布局和访问路径.实验结果表明,在本地内存受限的情况下,与透明使用远程内存相比,应用感知的设计方式的端到端性能最高提升了12倍.

关键词：图查询图数据库图存储远程内存属性图模型

An investigation into high-speed train interior noise with operational transfer path analysis method

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

Railway Engineering Science 2021年第1期29卷 1-14页

作者： Muxiao li Ziwei zhu Tiesong deng Xiaozhen Sheng State Key Laboratory of Traction Power Southwest Jiaotong UniversityChengdu 610031China CRRC Qingdao Sifang Co. Ltd.Qingdao 266111China School of Urban Railway Transportation Shanghai University of Engineering ScienceShanghai 201620China

Passengers’demands for riding comfort have been getting higher and higher as the high-speed railway *** methods to analyze the interior noise of the high-speed train are needed and the operational transfer path analysis(OTPA)method provides a theoretical basis and guidance for the noise control of the train and overcomes the shortcomings of the traditional method,which has high test efficiency and can be carried out during the working state of the targeted *** OTPA model is established from the aspects of“path reference point-target point”and“sound source reference point-target point”.As for the mechanism of the noise transmission path,an assumption is made that the direct sound propagation is ignored,and the symmetric sound source and the symmetric path are *** the operational test data and the OTPA method,combined with the results of spherical array sound source identification,the path contribution and sound source contribution of the interior noise are analyzed,respectively,from aspects of the total value and *** results show that the OTPA conforms to the calculation results of the spherical array sound source *** low speed,the contribution of the floor path and the contribution of the bogie sources are *** the speed is greater than 300 km/h,the contribution of the roof path is ***,for the carriage with a pantograph,the lifted pantograph is an obvious *** noise from the exterior sources of the train transfer into the interior mainly through the form of structural excitation,and the contribution of air excitation is *** analyses of train parts provide guides for the interior noise control.

关键词： High-speed train Interior noise OTPA method Acoustical source identification Transfer path Source contribution