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Thiolated, Reduced Palladium Nanoclusters with Resolved Structures for the Electrocatalytic Reduction of Oxygen

Angewandte Chemie 2022年第46期134卷

作者： Dr. Shengli Zhuang Dr. Dong Chen Dr. Qing You Wentao Fan Prof. Jun Yang Prof. Zhikun Wu Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and Nanotechnology CAS Center for Excellence in Nanoscience Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 P. R. China Department of Chemistry and Centre for Atomic Engineering of Advanced Materials Anhui University Hefei Anhui 230601 P. R. China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 P.R. China

Although thiolated, reduced Group 11 metal nanoclusters with atomic monodispersity have been repeatedly reported in the past decade, their Pd analogues have not been reported thus far. In this work, we provide a resolution for the challenging synthesis and obtain for the first time an atomically monodisperse thiolated, reduced Pd (q=+0.75) nanocluster with a di-tetrahedron Pd 8 kernel and a +3 charged interstitial B atom, as revealed by ESI-MS, SCXRD, etc. μ-6 B is found for the first time in Group 10 and 11 metal nanoclusters. More importantly, the as-obtained Pd nanoclusters show better catalytic activity compared to 1.4 nm Pd nanoparticles, Pd 2 complexes and even a commercial Pt/C catalyst for the oxygen reduction reaction (ORR), having significant implications for the influence of the metal charge state and space structure on the catalytic activity.

关键词： Electrocatalysis Interstitial B Atom ORR Nanoclusters Palladium

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Numerical and experimental studies on the influences of flow field on the measurement accuracy of ultrasonic water meters

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Measurement: Sensors 2021年 18卷

作者： Jieqiang Ji Jianying Zheng GuoFu Chen Xiaojie Wu NingNing Zhang Yan Fang Leming Cheng Zhejiang Province Institute of Metrology Hangzhou 310018 China National Centre of Quality Supervision and Testing on Liquid Flow Measuring Instruments Hangzhou 310018 China State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou 310027 China

CFD modelling and experiments are carried out to study the influences of flow field on the measurement accuracy of ultrasonic water meters. The swirl generator and flow disturber are selected to change the flow field distributions inside the pipe. The calculation results show that the installation of left-handed swirl generator induces a specific flow pattern of the fluid inside the pipe, while the installation of flow disturber leads to the distortion of the axial velocity distributions. The critical distance of the fluid reaching the steady flow is 10D for left-handed swirl generator and flow disturber. In the experiment part, six different ultrasonic water meters are selected for the intrinsic errors tests. The results show that the installations of swirl generator and flow disturber induce the intrinsic errors shift to negative values. Compared with the flow disturber, the swirl generator has greater impact on the measurement accuracy.

关键词： flow field Disturbance generators Ultrasonic water meters CFD

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Insights into Charge Transfer at an Atomically Precise Nanocluster/Semiconductor Interface

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Angewandte Chemie 2020年第20期132卷

作者： Yu Wang Xiao‐He Liu Qiankun Wang Martin Quick Sergey A. Kovalenko Qing‐Yun Chen Norbert Koch Nicola Pinna Institut für Chemie and IRIS Adlershof Humboldt-Universität zu Berlin Brook-Taylor-Strasse 2 12489 Berlin Germany International Research Center for Renewable Energy (IRCRE) and State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 P. R. China Institut für Physik and IRIS Adlershof Humboldt-Universität zu Berlin Brook-Taylor-Strasse 6 12489 Berlin Germany

The deposition of an atomically precise nanocluster, for example, Ag 44 (SR) 30 , onto a large‐band‐gap semiconductor such as TiO 2 allows a clear interface to be obtained to study charge transfer at the interface. Changing the light source from visible light to simulated sunlight led to a three orders of magnitude enhancement in the photocatalytic H 2 generation, with the H 2 production rate reaching 7.4 mmol h −1 g catalyst −1 . This is five times higher than that of TiO 2 modified with Ag nanoparticles and even comparable to that of TiO 2 modified with Pt nanoparticles under similar conditions. Energy band alignment and transient absorption spectroscopy reveal that the role of the metal clusters is different from that of both organometallic complexes and plasmonic nanoparticles: A type II heterojunction charge‐transfer route is achieved under UV/Vis irradiation, with the cluster serving as a small‐band‐gap semiconductor. This results in the clusters acting as co‐catalysts rather than merely photosensitizers.

关键词： Ladungstransfer Cokatalysatoren Photosensibilisator Silber-Nanocluster

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Correction to: Research on Performance and Safety of Composite Inorganic Phase-Change Materials (NaNO3/SiO2/C) under Low-temperature Cold Shock

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Journal of Materials engineering and Performance 2021年第11期30卷 8686-8686页

作者： Liu, Liang Wu, Aixiang Huang, Yun Li, Junqin Beijing Academy of Safety Science and Technology Beijing China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing China Anhui Emergency Management Publicity and Education Center Hefei China Gansu Vocational and Technical College of Communications Lanzhou China

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Unveiling Electrochemical Urea Synthesis by Co-Activation of CO2and N2with Mott–Schottky Heterostructure Catalysts

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Angewandte Chemie 2021年第19期133卷

作者： Menglei Yuan Junwu Chen Yiling Bai Prof. Zhanjun Liu Jingxian Zhang Tongkun Zhao Qin Wang Shuwei Li Prof. Hongyan He Prof. Guangjin Zhang CAS Key Laboratory of Green Process Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 P. R. China Center of Materials Science and Optoeletronics Engineering University of Chinese Academy of Sciences Beijing 100049 P. R. China CAS Key Laboratory of Carbon Materials Institute of Coal Chemistry Chinese Academy of Sciences Taiyuan 030001 P. R. China Engineering Design Department Hebei Enco Petrochemical Engineering Co. Ltd. Henan Branch Henan 450000 P. R. China Chemistry and Chemical Engineering Guangdong Laboratory Shantou 515031 P. R. China

Electrocatalytic C−N bond coupling to convert CO 2 and N 2 molecules into urea under ambient conditions is a promising alternative to harsh industrial processes. However, the adsorption and activation of inert gas molecules and then the driving of the C–N coupling reaction is energetically challenging. Herein, novel Mott–Schottky Bi-BiVO 4 heterostructures are described that realize a remarkable urea yield rate of 5.91 mmol h −1 g −1 and a Faradaic efficiency of 12.55 % at −0.4 V vs. RHE. Comprehensive analysis confirms the emerging space–charge region in the heterostructure interface not only facilitates the targeted adsorption and activation of CO 2 and N 2 molecules on the generated local nucleophilic and electrophilic regions, but also effectively suppresses CO poisoning and the formation of endothermic *NNH intermediates. This guarantees the desired exothermic coupling of *N=N* intermediates and generated CO to form the urea precursor, *NCON*.

关键词： C–N coupling electrocatalysis Mott–Schottky heterostructures urea

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Theoretical and Experimental Study on Vibrations of Long-Span Bridge Cables Considering Non-Uniform Additional Tension

SSRN

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SSRN 2024年

作者： Zhang, Xin Zhou, Tao Alkayem, Nizar Cao, Maosen Wang, Qiang Peng, Jiayi Ostachowicz, Wieslaw Department of Measurement and Control Nanjing University of Posts and Telecommunications 9 Wenyuan Road Nanjing210003 China Department of Engineering Mechanics Hohai University 1 Xikang Road Nanjing210098 China Changjiang River Scientific Research Institute Yangtze River Water Resources Commission 23 Huangpu Road Wuhan430010 China The State Key Laboratory for the Safety Long-life Health Operation and Maintenance of Long-span Bridges Jiangsu Transportation Research Institute 2200 Chengxin Road Nanjing210098 China Institute of Fluid-Flow Machinery Polish Academy of Sciences 14 ul. Fiszera Gdansk80-952 Poland

Long-span cables become more flexible and may lead to severe vibration responses, which jeopardizing the structural safety of bridge engineering. Currently, the experimental investigation of long span cables is relatively rare, lacking the of analytical methods that can describe their dynamic features. To address this issue, this paper conducts a theoretical and experimental study on vibrations of long-span bridge cables. A vibration model is proposed to show the influence of non-uniform additional tension. The dynamic control equation is further derived and simplified through non-dimensional process. Besides, parameters studies are made to evaluate the effect of non-dimensional parameters (i.e. material and geometrical parameters) on modal parameters (i.e. frequency and modal shape). Finally, a field experiment is implemented in a long-span bridge to collect the in-plane and out-plane vibration. The dynamic features of long-span cables are analyzed and compared with the theoretical results. In particular, the vibration characteristics and energy distribution pattern of in-plane and out-plane vibration are discussed. It is found that the proposed model can describe the in-plane and out-plane vibrations of long-span cables. © 2024, The Authors. All rights reserved.

关键词： Geometry

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Multi-scale reconstruction of porous media from low-resolution core images using conditional generative adversarial networks

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Journal of Natural Gas Science and engineering 2022年 99卷

作者： Yongfei Yang Fugui Liu Jun Yao Stefan Iglauer Mozhdeh Sajjadi Kai Zhang Hai Sun Lei Zhang Junjie Zhong Vadim Lisitsa Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)) Ministry of Education Qingdao 266580 PR China Research Center of Multiphase Flow in Porous Media School of Petroleum Engineering China University of Petroleum (East China) Qingdao 266580 PR China Petroleum Engineering Department Edith Cowan University Joondalup Western Australia 6027 Australia Institute of Petroleum Engineering College of Engineering University of Tehran Tehran *** Iran Institute of Mathematics SB RAS Novosibirsk 630090 Russia

Various rocks such as carbonate, coal or shale contain both micro- and macro-pores. To accurately predict the fluid flow and mechanical properties of these porous media, a multi-scale characterization of the pore space is of key importance. Hybrid superposition methods perform well in such multi-scale reconstructions, however, input images with two resolutions (high and low) and different reconstruction methods are required. In addition, the superposition algorithms are complex and human factors can introduce serious bias. Here we thus propose an effective approach based on conditional generative adversarial network (cGAN) for efficient and reliable multi-scale digital rock reconstruction based only on low-resolution core images. High-resolution core images with narrow field of view (FOV) and their corresponding large structure images were thus used to train the cGAN model. The model was validated with real sample images, and the model-generated images exhibited great agreement with the real pore structures. We also demonstrate that the proposed method can generate images independent of the structure size to some extent. This work provides an advanced image-generating model based on deep learning, and therefore aids in better and wider pore-scale characterization and process modeling, to improve understanding of subsurface science and engineering processes.

关键词： Multi-scale Digital rock Generative adversarial network Porous media reconstruction Deep learning

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Water-Soluble Carbon Monoxide-Releasing Molecules (CORMs)

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Topics in current chemistry (Cham) 2022年第1期381卷 3页

作者： Huma Khan Muhammad Faizan Salamat Ullah Khan Niazi Niaz Muhammad Weiqiang Zhang Key Laboratory of Applied Surface and Colloid Chemistry MOE School of Chemistry and Chemical Engineering Shaanxi Normal University Xi'an 710062 China. Key Laboratory of Applied Surface and Colloid Chemistry MOE School of Chemistry and Chemical Engineering Shaanxi Normal University Xi'an 710062 China. faizanattari@***. Beijing Key Laboratory of Ionic Liquids Clean Process CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China. faizanattari@***. University of Chinese Academy of Sciences Beijing 100049 China. faizanattari@***. School of Electronic Science and Information Technology Xian Jiaotong University Xi'an 710049 China. School of Biochemistry Minhaj University Lahore Lahore 54000 Pakistan. niazpk@***. Key Laboratory of Applied Surface and Colloid Chemistry MOE School of Chemistry and Chemical Engineering Shaanxi Normal University Xi'an 710062 China. zwq@***.

Carbon monoxide-releasing molecules (CORMs) are promising candidates for producing carbon monoxide in the mammalian body for therapeutic purposes. At higher concentrations, CO has a harmful effect on the mammalian organism. However, lower doses at a controlled rate can provide cellular signaling for mandatory pharmacokinetic and pathological activities. To date, exploring the therapeutic implications of CO dose as a prodrug has attracted much attention due to its therapeutic significance. There are two different methods of CO insertion, i.e., indirect and direct exogenous insertion. Indirect exogenous insertion of CO suggests an advantage of reduced toxicity over direct exogenous insertion. For indirect exogenous insertion, researchers are facing the issue of tissue selectivity. To solve this issue, developers have considered the newly produced CORMs. Herein, metal carbonyl complexes (MCCs) are covalently linked with CO molecules to produce different CORMs such as CORM-1, CORM-2, and CORM-3, etc. All these CORMs required exogenous CO insertion to achieve the therapeutic targets at the optimized rate under peculiar conditions or/and triggering. Meanwhile, the metal residue was generated from i-CORMs, which can propagate toxicity. Herein, we explain CO administration, water-soluble CORMs, tissue accumulation, and cytotoxicity of depleted CORMs and the kinetic profile of CO release.

关键词： CO-releasing molecules (CORMs) Carbon monoxide (CO) Cellular targets Cytotoxicity Organometallic complexes Water-soluble CORMs

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乙醇-空气混合气预混层流燃烧研究

乙醇-空气混合气预混层流燃烧研究

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2012年中国特种发动机工程及应用学术年会

作者： Zhang Zhiyuan 张志远 Huang Zuohua 黄佐华 Han Shu 韩树 Ma Xiangping 马向平 Huang Jun 黄军 Department of Mechanical Engineering Academy of Armored Forces Engineering Beijing 100072 装甲兵工程学院机械工程系北京 100072 State Key Laboratory of Muhiphase Flow in Power Engineering Xi'an Jiaotong University Shanxi Xi 'a 西安交通大学动力工程多相流国家重点实验室陕西西安 710049

利用定容燃烧弹研究了不同初始压力、初始温度、气体稀释度和燃空当量比下乙醇-空气-稀释气预混层流燃烧特性.结果表明：对于给定初始压力和温度，乙醇-空气预混合气的质量燃烧率、燃烧压力和温度的最大值均出现在当量比1.1左右，而火... 详细信息

利用定容燃烧弹研究了不同初始压力、初始温度、气体稀释度和燃空当量比下乙醇-空气-稀释气预混层流燃烧特性.结果表明：对于给定初始压力和温度，乙醇-空气预混合气的质量燃烧率、燃烧压力和温度的最大值均出现在当量比1.1左右，而火焰发展期和燃烧期在此当量比下最短，火焰发展期、燃烧期和燃烧压力峰值随初始温度的增加而减小，最高燃烧温度随初始温度的增加而增加，燃烧压力峰值和最高燃烧温度随初始压力的增加而增加，火焰发展期和燃烧期随稀释度的增加而增加，而燃烧压力峰值和最高燃烧温度随稀释度的增加而降低.

关键词：燃烧系统燃料乙醇混合气体温度控制

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Cover Picture: Phosphoric Acid: A key Role in Control of Structure and Properties of Vanadium Phosphorus Oxide Catalysts During Synthesis (04/2021)

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ChemistrySelect 2021年第4期6卷

作者： Ting Zhang Dr. Ruirui Zhang Yongkang Zhang Zhiqi Xie Yingwei Li Hui Wu Dr. Fei Dai Prof. Ruixia Liu Beijing Key Laboratory of Ionic Liquids Clean Process CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering CAS 1North 2nd Street Zhongguancun Haidian District Beijing 100190 CN Sino-Danish College University of Chinese Academy of Sciences Yuquan Road Shijingshan District Beijing 100049 CN The authors T. Zhang and R. Zhang contributed equally to this article. School of Chemical Engineering University of Chinese Academy of Sciences Yuquan Road Shijingshan District Beijing 100049 CN

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