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Cover Feature: Hollow Carbon Sphere-Modified Graphitic Carbon Nitride for Efficient Photocatalytic H2Production (Chem. Eur. J. 68/2021)

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Chemistry – A European Journal 2021年第68期27卷

作者： Dr. Jinghua Li Dr. Lunqiao Xiong Dr. Bing Luo Prof. Dengwei Jing Dr. Jiamei Cao Prof. Junwang Tang International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 P. R. China Department of Chemical Engineering University College London London WC1E 7JE UK School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an Shaanxi 710049 P. R. China

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flow behaviors of shale oil in kerogen slit by molecular dynamics simulation

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Chemical engineering Journal 2022年 434卷

作者： Jie Liu Yongfei Yang Shuyu Sun Jun Yao Jianlong Kou Physical Science and Engineering Division (PSE) Computational Transport Phenomena Laboratory King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Saudi Arabia 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 Institute of Condensed Matter Physics Zhejiang Normal University Jinhua 321004 PR China

In the last decades, shale oil, mainly distributed in the nanopores of shale, has been considered as the representative of unconventional energy to alleviate the energy crisis. But the ideal pore models greatly overestimate the flowing capability of shale oil. To get more accurate and reasonable flow behavior, the multicomponent shale oil in the realistic kerogen channel is studied by using molecular dynamic simulation. Both density and velocity distributions that along and perpendicular to the flow direction are studied in kerogen channel, where the influence of branch chain of kerogen is also took into consideration. The heavy component tends to form the adsorbed layers on the kerogen wall, as a result of the extremely strong affinity between kerogen and hydrocarbons, and some asphaltene molecules in bulk phase form the cluster in middle of slit. On the flow direction, the velocity profile preforms the peristaltic behavior due to the effect of branch chain of kerogen, and the toluene and asphaltene components contribute it mostly. According to the heterogeneous characteristics of shale oil flow, we define the fictitious slip boundary, which corresponds to the boundary between bulk phase and adsorbed phase, to describe shale oil flow precisely. We also examine the effects of driving pressure gradient, temperature and pore size on the flow behaviors. The enhancements of driving force and temperature both facilitate shale oil flow, and the maximum velocity reaches the stable value within larger kerogen pores. The potential energy distribution and the interaction force contour verified the peristaltic flow behavior and the validity of fictitious slip boundary.

关键词： Shale oil Kerogen flow behavior Molecular simulation

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Fabrication of highly reliable joint based on Cu/Ni/Sn double-layer powder for high temperature application

Fabrication of highly reliable joint based on Cu/Ni/Sn doubl...

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作者： Xu, Hongyan Shen, Yaochun Hu, Yihua Li, Jianqiang Xu, Ju Beijing Engineering Laboratory of Electrical Drive System and Power Electronic Device Packaging Technology Micro-Nano Fabrication Technology Department Institute of Electronic Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China School of Electrical Engineering Electronics and Computer Science University of Liverpool Brownlow Hill LiverpoolL69 3GJ United Kingdom State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China

A highly reliable three-dimensional network structure joint was fabricated based on Cu/Ni/Sn powder with double-layer coatings and transient liquid phase bonding (TLPB) technology for high temperature application. The Cu/Ni/Sn joint is characterized by Cu metal particles embedded in the matrix of (Cu,Ni)6Sn5/Ni3Sn4 intermetallic compounds (IMCs), with a low void ratio, and can be reflowed at low temperatures (6Sn5/ Ni3Sn4 IMCs, and the Cu/Ni/Sn joint had a lower void ratio and a higher shear strength than those of Cu/Sn. The mechanism of the Ni-coating layer inhibiting phase transformation was studied. The high reliable three-dimensional network structure joint based on Cu/Ni/Sn double-layer powder was fabricated for high temperature application. Copyright © International Microelectronics Assembly and Packaging Society

关键词： High temperature applications

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Fabrication of highly reliable jointbased on Cu@Ni@Sn double-layerpowderfor high temperature application

Fabrication of highly reliable jointbased on Cu@Ni@Sn double...

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作者： Xu, Hongyan Shen, Yaochun Hu, Yihua Li, Jianqiang Xu, Ju Beijing Engineering Laboratory of Electrical Drive System & Power Electronic Device Packaging Technology Micro-nano fabrication technology department Institute of Electronic Engineering Chinese Academy of Sciences Beijing 100190 China School of Electrical Engineering Electronics andComputer Science University of Liverpool LiverpoolL69 3GJ United Kingdom State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China

A highly reliable three-dimensional networkstructure jointwas fabricatedbased on Cu@Ni@Sn core-shell powderand transient liquid phase bonding (TLPB) technologyfor high temperature application. Cu@Ni@Sn joint is characterized by Cu metal particles embedded in the matrix of (Cu,Ni)6Sn5/Ni3Sn4intermetallics (IMCs), low level of voiding is achieved, they can be reflowed at a low temperatures( © 2019 IMAPS-International Microelectronics and Packaging Society. All rights reserved.

关键词： High temperature applications

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Optimization Design of Axial Fan Blade

Optimization Design of Axial Fan Blade

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第三届中国国际透平机械学术会议

作者： Yu-jing Wu Dian-gui Huang School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai Key Laboratory of Power Energy in Multiphase Flow and Heat Transfer

An airfoil series consisting of 8 airfoils are obtained through the optimization design method which aimed to the lift drag *** new airfoil serie is used to construct the blade,the chord length and installation angle of the blade along the blade height are optimized by using orthogonal optimization method,meanwhile,three design options of straight blades,C-type blades and forward swept blade are provided in this *** a axial fan as the research object,the whole 3D numerical simulation was conducted by using *** axial fans with three kinds of blades are respectively discussed and compared under design and off-design *** show that under design conditions,the full pressure efficiency of the axial flow fan with the forward swept blade is the highest,and the C-type blade has slightly lower efficiency and the straight blade has the lowest *** off-design conditions,the aerodynamic performance of the forward-swept balde and C-type blade fans are better than that of the straightblade fans.

关键词： Axial Fan Forward Swept Blade C-type Blade 3D Design

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Co2 Capture Performance and Energy Recovery in Pilot-Scale Thermal Electrochemical Co-Drive System

SSRN

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SSRN 2019年

作者： Ding, Wancheng Yu, Yunsong Zhang, Zaoxiao Wang, Geoff School of Chemical Engineering and Technology Xi’an Jiaotong University No.28 Xianning West Road Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University No.28 Xianning West Road Xi’an710049 China School of Chemical Engineering The University of Queensland St LuciaQLD4072 Australia

关键词： Greenhouse gases

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Structure engineering of Graphitic Carbon Nitride for Efficient Photocatalytic Water Splitting

Structure Engineering of Graphitic Carbon Nitride for Effici...

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中国化学会第三届中国能源材料化学研讨会

作者：沈少华 International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong University

Photocatalytic overall water splitting without using sacrificial agents is very appealing for converting solar energy into chemical ***,polymer photocatalysts with tunable molecular structures have emerged as promisin... 详细信息

关键词： Structure engineering of Graphitic Carbon Nitride for Efficient Photocatalytic Water Splitting

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A mixed discontinuous galerkin method for linear elasticity with strongly imposed symmetry

arXiv

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arXiv 2019年

作者： Wang, Fei Wu, Shuonan Xu, Jinchao School of Mathematics and Statistics and State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi710049 China School of Mathematical Sciences Peking University Beijing100871 China Department of Mathematics Pennsylvania State University University ParkPA16802 United States

In this paper, we study a mixed discontinuous Galerkin (MDG) method to solve linear elasticity problem with arbitrary order discontinuous finite element spaces in d-dimension (d = 2, 3). This method uses polynomials of degree k + 1 for the stress and of degree k for the displacement (k > 0). The mixed DG scheme is proved to be well-posed under proper norms. Specifically, we prove that, for any k > 0, the H(div)-like error estimate for the stress and L2 error estimate for the displacement are optimal. We further establish the optimal L2 error estimate for the stress provided that the Pk+2 - P-1 k+1 Stokes pair is stable and k > d. We also provide numerical results of MDG showing that the orders of convergence are actually sharp.65N30, 65M60 Copyright © 2019, The Authors. All rights reserved.

关键词： Galerkin methods

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Effect of proppant impingement on flow-induced corrosion of tubular steel super 13Cr via CFD and experiment

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Egyptian Journal of Petroleum 2018年第4期27卷 633-640页

作者： Cheng, J.R. Zhang, N.S. Cao, Y.P. Li, Z. Dou, Y.H. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No. 28 Xianning West Road Xi'an 710049 Shaanxi Province China Department of Petroleum Engineering Xi'an Shiyou University Xi'an 710065 Shaanxi Province China Department of Mechanical Engineering Xi'an Shiyou University Xi'an 710065 Shaanxi Province China

Data from a standard laboratory test including open-circuit potential (OCP) and current density monitoring is used to study the effect of fracturing proppant impingement on corrosion of tubular steel. A solid-liquid flow simulation is performed to obtain some parameters of particle movement and oxygen mass transfer near the metal surface. The results show that the electrochemical reaction includes passivation, activation and repassivation during a particle impact on the metal surface. Once the metal surface is in the activated state, the potential and anode current density is controlled by the oxygen concentration in the boundary layer and repassivation rate of metal surface. The increase of particle impact velocity accelerates the transmission of corrosion reactants and creates deeper impact craters on metal surface, resulting in the increase of current density. Meanwhile, the high speed particle impingement causes some platelets and extruding lips and thus weakens the surface corrosion resistance of stainless steel. © 2017

关键词： flow-induced corrosion Particle impingement Passive films Repassivation Tubular steel

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Numerical Study on flow Field of a Diameter-varying Spray Tower for Amine-based CO2 Absorption 14

Numerical Study on Flow Field of a Diameter-varying Spray To...

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14th International Conference on Greenhouse Gas Control Technologies, GHGT 2018

作者： Wu, Xiaomei Yu, Yunsong Zhang, Zaoxiao Wang, Geoff Rudolph, Victor School of Chemical Engineering and Technology Xi’an Jiaotong University No.28 Xianning West Road Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China School of Chemical Engineering The University of Queensland St LuciaQLD4072 Australia

Our group proposed a diameter-varying spray tower and a new spray mode of dual-nozzle opposed impinging spray to enhance the absorption performance of CO2 spray absorption process and some interesting results have been obtained. However, the detailed information (flow field distribution) inside the tower is hard to be obtained by experimental work. In this work, to specifically explain the performance inside the proposed diameter-varying spray tower, ANSYS Fluent17.2 software was used to simulate gas-liquid two-phase flow inside the proposed diameter-varying spray tower. Two different spray methods are discussed in this work. One is the dual-nozzle opposed impinging spray method proposed by our research group, the other is mostly literature discussed spray in the middle method. The flow field of continuous gas phase and dispersed liquid phase has been carefully discussed to illustrate the better spray method, which do more good to the CO2 absorption performance. © 2018 GHGT 2018 - 14th International Conference on Greenhouse Gas Control Technologies. All rights reserved.

关键词： Carbon dioxide

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