检索结果-南通市图书馆

Low‐dimensional material supported single‐atom catalysts for electrochemical CO_(2) reduction

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

SmartMat 2022年第1期3卷 84-110页

作者： bingqing wang Shenghua Chen Zedong Zhang Dingsheng wang Department of Chemistry Tsinghua UniversityBeijingChina

Converting CO_(2) emissions to valuable carbonaceous chemicals/fuels under mild conditions provides a sustainable way to maintain carbon balance and alleviate the energy ***‐dimensional material(LDM)supported single‐atom catalysts(SACs)have been attracted significant attention for electrochemical CO_(2) reduction reaction(ECR)in recent *** is mainly because integrating the single‐atoms and LDMs can inherit the advantages of themselves and the synergy effects between them are potential to enhance the ECR *** this review,we summarized the strategies for synthesizing LDM supported SACs for ECR,and different LDM supported SACs for ECR have been briefly ***,some optimization strategies for LDM supported SACs towards CO_(2) electroreduction are *** the end of this review,the perspectives and challenges of LDM supported SACs for ECR are provided.

关键词： ECR electrochemical CO_(2)reduction low‐dimensional material single‐atom catalysts

Effect of nitrile butadiene rubber hardness on the sealing characteristics of hydraulic O-ring rod seals

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) 2024年第1期25卷 63-78页

作者： Xiaoxuan LI bingqing wang Xudong PENG Yuntang LI Xiaolu LI Yuan CHEN Jie JIN College of Quality and Safety Engineering China Jiliang UniversityHangzhou310018China College of Mechanical and Electrical Engineering China Jiliang UniversityHangzhou310018China College of Mechanical Engineering Zhejiang University of TechnologyHangzhou310023China

The nitrile butadiene rubber(NBR)hardness effect on the sealing characteristics of hydraulic O-ring rod seals is analyzed based on a mixed lubrication elastohydrodynamic *** studies are conducted to reveal the mechanism of the influence of rubber hardness on the static and dynamic behavior of *** optimized selections of rubber hardness are then investigated under different *** show that the low hardness seal is prone to stress concentration due to the extrusion effect under high pressure conditions;it is also more prone to leaking.A high hardness seal can better prevent leakage by reducing film thickness but it will cause large frictional power loss and increase the probability of wear *** choice of low hardness is recommended to reduce friction with the premise that leakage requirements are met.

关键词： Nitrile butadiene rubber(NBR)hardness Sealing characteristics Optimized selection O-ring seal

Conversion of Au(Ⅲ)-polluted waste eggshell into functional CaO/Au nanocatalyst for biodiesel production

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

Green Energy & Environment 2022年第2期7卷 352-359页

作者： Jiadi Liu Minghuan Liu Shaoyun Chen bingqing wang Jin Chen Da-Peng Yang Shangzhou Zhang Wenxiao Du College of Life Science Yantai UniversityYantaiShandong Province264005China School of Nuclear Equipment and Nuclear Engineering Yantai UniversityYantaiShandong Province264005China College of Chemical Engineering and Materials Science Quanzhou Normal UniversityQuanzhouFujian Province362000China Clinical Center for Molecular Diagnosis and Therapy The Second Affiliated Hospital of Fujian Medical UniversityQuanzhouShandong Province362000China

Developing an environmental-friendly and highly active catalyst in transesterification for biodiesel production is of great importance for a more economic biodisel ***,we reported that waste eggshells were used to adsorb Au(Ⅲ) in water and convert the Au(Ⅲ)-polluted eggshells into the functional nanocatalyst-Ca O/Au for the transesterification reaction between soybean oil and methanol to the preparation of *** coupling of Ca O and Au nanoparticles,Ca O/Au nanoparticles showed superior catalytic activity for the transesterification reaction between soybean oil and *** optimum performance was observed over Ca O/Au nanocomposites in a methanol-oil molar ratio at 12:1with catalyst content of 1.0 wt% at 70°C for 3 ***,the catalytic activity of Ca O/Au nanocatalyst was almost unchanged after recycling for 5 times and the yield of biodiesel still kept at 88.9%.The proof-of concept study provided us a sustainable method for utilization of waste eggshells to remedy the metal ions-polluted wastewater and the synthesis of functional nanocomposite for biodiesel production,show great potential application of waste eggshell in adsorption and catalytic reactions.

关键词： process Au(Ⅲ) catalyst

Rational design of ternary NiS/CQDs/ZnIn_2S_4 nanocomposites as efficient noble-metal-free photocatalyst for hydrogen evolution under visible light

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Catalysis 2019年第3期40卷 335-342页

作者： bingqing wang Yao Ding Zirong Deng Zhaohui Li Research Institute of Photocatalysis State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University Fuzhou350116 Fujian China

The NiS/CQDs nanocomposite (CQDs represents carbon quantum dots), with a mass ratio of NiS/CQDs to be 1.19:1 based on the ICP result, was obtained via a facile hydrothermal method from a mixture of CQDs, Ni(OAc)2 and Na2S. The self-assembly of ZnIn2S4 microspheres on the surface of NiS/CQDs was realized under microwave conditions to obtain a ternary NiS/CQDs/ZnIn2S4 nanocomposite. The as-obtained NiS/CQDs/ZnIn2S4 nanocomposite was fully characterized, and its photocatalytic hydrogen evolution under visible light irradiation was investigated. The ternary NiS/CQDs/ZnIn2S4 nanocomposite showed superior photocatalytic activity for hydrogen evolution than ternary CQDs/NiS/ZnIn2S4, which was obtained by deposition of NiS in the preformed CQDs/ZnIn2S4. The superior photocatalytic performance of ternary NiS/CQDs/ZnIn2S4 is ascribed to the introduction of CQDs, which act as a bridge to promote the vectorial transfer of photo-generated electrons from ZnIn2S4 to NiS. This result suggests that the rational design and fabrication of ternary CQDs-based systems are important for the efficient photocatalytic hydrogen evolution. This study provides a strategy for developing highly efficient noble-metal-free photocatalysts for hydrogen evolution using CQDs as a bridge to promote the charge transfer in the nanocomposite.

关键词： Photocatalysis Hydrogen evolution NiS Carbon quantum dots ZnIn2S4

Ultra-thin metal-organic framework nanoribbons

在线全文

学校读者我要写书评

暂无评论

National Science Review 2020年第1期7卷 46-52页

作者： bingqing wang Meiting Zhao Liuxiao Li Ying Huang Xiao Zhang Chong Guo Zhicheng Zhang Hongfei Cheng Wenxian Liu Jing Shang Jing Jin Xiaoming Sun Junfeng Liu Hua Zhang State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Center for Programmable Materials School of Materials Science and Engineering Nanyang Technological University Department of Chemistry City University of Hong Kong

Structure engineering of metal-organic frameworks(MOFs) at the nanometer scale is attracting increasing interest due to their unique properties and new functions that normally cannot be achieved in bulk MOF crystals. Here, we report the preparation of ultra-thin MOF nanoribbons(NRBs) by using metal-hydroxide nanostructures as the precursors. Importantly, this general method can be used to synthesize various kinds of ultra-thin MOF NRBs, such as MBDC(M = Co, Ni; BDC = 1,4-benzenedicarboxylate), NiCoBDC,CoTCPP(TCPP = tetrakis(4-carboxyphenyl)porphyrin) and MIL-53(Al) NRBs. As a proof-of-concept application, the as-prepared ultra-thin Co BDC NRBs have been successfully used as a fluorescent sensing platform for DNA detection, which exhibited excellent sensitivity and selectivity. The present strategy might open an avenue to prepare MOF nanomaterials with new structures and unique properties for various promising applications.

关键词： metal-organic frameworks nanoribbons metal-hydroxide nanostructures structure engineering DNA detection

Ultrasmall Ag nanoclusters anchored on NiCo-layered double hydroxide nanoarray for efficient electrooxidation of 5-hydroxymethylfurfural

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Materials 2022年第10期65卷 2704-2710页

作者： Jing Jin Yingyan Fang Tianyu Zhang Aijuan Han bingqing wang Junfeng Liu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China

Electrochemical oxidation of 5-hydroxymethylfurfural(HMF)has shown promising prospects in producing highly valuable ***,we report the synthesis of ultrasmall Ag nanoclusters anchored on NiColayered double hydroxide(NiCo-LDH)nanosheet arrays(Agn@NiCo-LDH)via a facile electrodeposition *** prepared Agn@NiCo-LDH nanosheet arrays exhibit excellent electrocatalytic HMF oxidation performance with a current density of 10 mA cm^(−2) at 1.29 VRHE and the Faraday efficiency of nearly 100%for 2,5-furandicarboxylic acid *** study offers an effective approach to rationally design nanoclusters to achieve high catalytic activity for sustainable energy conversion and production.

关键词： ultrasmall Ag nanoclusters layered double hydroxides nanosheet array electrodeposition 5-hydroxymethylfurfural electrooxidation

基于软弹流润滑模型的液压格莱圈密封性能分析

在线全文

学校读者我要写书评

暂无评论

摩擦学学报 2018年第1期38卷 75-83页

作者：王冰清彭旭东孟祥铠浙江工业大学机械工程学院浙江杭州310032 浙江工业大学过程装备及其再制造教育部工程研究中心浙江杭州310032

基于软弹流理论建立了液压往复格莱圈密封的数值分析模型,该耦合模型包括流体力学、接触力学、变形和热分析.数值求解获得了密封区域的膜厚、流体压力和接触压力分布,以及单个行程的流量和活塞杆表面的摩擦力,揭示了液压往复格莱圈密封... 详细信息

基于软弹流理论建立了液压往复格莱圈密封的数值分析模型,该耦合模型包括流体力学、接触力学、变形和热分析.数值求解获得了密封区域的膜厚、流体压力和接触压力分布,以及单个行程的流量和活塞杆表面的摩擦力,揭示了液压往复格莱圈密封的密封机理.通过参数化进一步分析了不同密封表面均方根粗糙度、密封压力和往复速度对密封性能的影响.结果表明:在本研究中,密封区域表现为混合润滑状态,且以微凸体接触摩擦为主;较小的密封表面均方根粗糙度值具有较好的密封性能,增大密封压力会导致泄漏量和摩擦力均增加,而增大往复速度有利于减小泄漏量.

关键词：软弹流格莱圈往复密封

在线全文

学校读者我要写书评

暂无评论

基于瞬时功率理论的变压器CT接线校验方法

电力系统保护与控制 2019年第6期47卷 173-179页

作者：王冰清李本瑜宋晓亮长园深瑞继保自动化有限公司广东深圳518057 云南电力调度控制中心云南昆明650011

变压器CT接线的正确性是变压器保护装置正确动作与测控装置准确工作的基础。为了解决现有主变CT二次回路接线校验方案准确性差、步骤复杂、效率低等问题,提出一种基于瞬时无功功率理论的利用变压器空载合闸时所产生的励磁涌流来校验高压... 详细信息

变压器CT接线的正确性是变压器保护装置正确动作与测控装置准确工作的基础。为了解决现有主变CT二次回路接线校验方案准确性差、步骤复杂、效率低等问题,提出一种基于瞬时无功功率理论的利用变压器空载合闸时所产生的励磁涌流来校验高压侧CT接线的方法。该方法通过分析励磁涌流的产生机理并利用其功率特性,即可对变压器高压侧的CT极性及相序接线进行校验,并在检测出CT接线错误的情况下,经延时动作出口。在有效提升变压器新设备启动效率的同时,提高了系统运行的可靠性。RTDS仿真及实验验证了该方法的有效性。

关键词：变压器保护励磁涌流瞬时无功功率理论 CT极性校验

变电站智能化改造的过程层设备平滑接入方案研究

在线全文

学校读者我要写书评

暂无评论

电力系统保护与控制 2016年第15期44卷 159-163页

作者：张广嘉王冰清王乾刚长园深瑞继保自动化有限公司广东深圳518057

提出一种应用于传统变电站智能化改造中的过程层设备平滑接入方案,分别从系统结构、通讯组网方案、功能配置以及内部数据的交互协同模式等多角度对该系统设备进行研究。在系统硬件设计的基础上,对信号数据流进行分析说明。为了满足大容... 详细信息

提出一种应用于传统变电站智能化改造中的过程层设备平滑接入方案,分别从系统结构、通讯组网方案、功能配置以及内部数据的交互协同模式等多角度对该系统设备进行研究。在系统硬件设计的基础上,对信号数据流进行分析说明。为了满足大容量数据的接入,实现集成采集与控制,对SV、GOOSE的发送进行对应的硬件设计;并以该硬件系统构架为基础,建立数据总线、IO总线、校时总线以及管理总线等多层次的总线结构。该方案可以实现大容量数据接入与控制的同时满足变电站智能化改造过程中的平滑切换接入。

关键词：数字化变电站集成过程层多总线平滑接入