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Science China(Physics,Mechanics & Astronomy) 2022年第6期65卷 53-59页

作者： Jiliang Jing Shuai Chen Manman Sun Xiaokai He Mengjie wang Jieci wang Department of Physics Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of EducationSynergetic Innovation Center for Quantum Effects and ApplicationsHunan Normal UniversityChangsha 410081China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China School of Mathematics and Statistics Hunan First Normal UniversityChangsha 410205China

To build a self-consistent effective-one-body(EOB)theory,in which the Hamiltonian,radiation-reaction force and waveform for the“plus”and“cross”modes of the gravitational wave should be based on the same effective background spacetime,the key step is to look for the decoupled equation forψ^(B)_(4)=h_(+)−ih_(×),which seems a very difficult task because there are non-vanishing tetrad components of the tracefree Ricci tensor for such ***,based on an effective spacetime obtained in this paper by using the post-Minkowskian(PM)approximation,we find the decoupled equation forψ^(B)_(4)by dividing the perturbation part of the metric into the odd and even *** the effective metric and decoupled equation at hand,we set up a frame of self-consistent EOB model for spinless binaries.

关键词： post-Minkowskian approximation effective-one-body theory decoupled equation forψ^(B)_(4)

Numerical investigation of impinging jet ventilation in ICUs:Is thermal stratification a problem?

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Building Simulation 2023年第7期16卷 1173-1185页

作者： Lei wang Zhiqiang wang Sirui Zhu Zhe Zhu Tao Jin Jianjian Wei Institute of Refrigeration and Cryogenics/Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province Zhejiang UniversityHangzhouChina Center for Balance Architecture Zhejiang UniversityHangzhouChina The Architectural Design&Research Institute of Zhejiang University Co LtdHangzhouChina Zhejiang Modern Architectural Design and Research Institute Co LtdHangzhouChina

Intensive care units(ICUs)are the high incidence sites of hospital-acquired infections,where impinging jet ventilation(IJV)shows great *** stratification of IJV and its effect on contaminants distribution were systematically investigated in this *** changing the setting of heat source or the air change rates,the main driving force of supply airflow can be transformed between thermal buoyancy and inertial force,which can be quantitatively described by the dimensionless buoyant jet length scale(l_(m)^(-)).For the investigated air change rates,namely 2 ACH to 12 ACH,l_(m)^(-)varies between 0.20 and *** thermal buoyancy plays a dominant role in the movement of the horizontally exhaled airflow by the infector under low air change rate,where the temperature gradient is up to 2.45℃/*** flow center remains close to the breathing zone of the susceptible ahead,resulting into the highest exposure risk(6.6‰for 10-μm particles).With higher heat flux of four PC monitors(from 0 W to 125.85 W for each monitor),the temperature gradient in ICU rises from 0.22℃/m to 1.02℃/m;however,the average normalized concentration of gaseous contaminants in the occupied zone is reduced from 0.81 to 0.37,because their thermal plumes are also able to carry containments around them to the ceiling-level *** the air change rate was increased to 8 ACH(l_(m)^(-)=1.56),high momentum weakened the thermal stratification by reducing the temperature gradient to 0.37℃/m and exhaled flow readily rose above the breathing zone;the intake fraction of susceptible patient located in front of the infector for 10-μm particles reduces to 0.8‰.This study proved the potential application of IJV in ICUs and provides theoretical guidance for its appropriate design.

关键词： impinging jet ventilation heat sources air change rates respiratory particles lock-up phenomenon

Pollution characteristics of particulate matters emitted from outdoor barbecue cooking in urban Jinan in eastern China

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Frontiers of Environmental Science & Engineering 2018年第2期12卷 139-146页

作者： Yifei Song Lei Sun Xinfeng wang Yating Zhang Hui wang Rui Li Likun Xue Jianmin Chen Wenxing wang Environment Research Institute School of Environmental Science and Engineering Shandong University Jinan 250100 China

To understand the pollution characteristics of particulate matter emitted from outdoor barbecue conking in eastern China, measurements of the PM2.5 mass concentration, the number concentration of particles with a diameter of 0.01 to 1.0 pm, and the particle size distribution from 0.3 to 25 μm were carried out at seven barbecue restaurants in urban Jinan. The average PM2.5 mass concentration and sub-micron particle number concentrations at a distance of 1 m from the grills were 250 to 1083μtg/m-3 and 0.90 × 105 to 2.23 × 105 cm 3 respectively, which were much higher than those in the ambient air of the urban area. Compared to the ambient atmosphere, barbecue cooking emitted very high levels of particles with a larger increase in the concentrations of super-micron particles than that of sub-micron particles. The super-micron particle number concentrations at the barbecue restaurants were 10 to I O0 times higher than those observed in the ambient urban atmosphere. The barbecue smoke had a significant effect on the particle concentrations in the surrctindng region.. Both mass and number concentrations of particles exhibited maximum values immediately-near the barbecue grills and often reached a peak at a distance of 10 to 15 m. The removal efficiency of a range hood for the cooking particles was tested in an indoor kitchen. The range hood effectively cleaned the particulate matter pollution caused by cooking with a removal efficiency larger than 80%, Therefore, the use of a range hood is recommended for outdoor barbecue restaurants coupled with a smoke purifier to clean the emitted high concentrations of particles.

关键词： Barbecue smoke Particulate matters Pollution characteristicsEmissionsRemoval

Superlow Power Consumption Artificial Synapses Based on WSe2 Quantum Dots Memristor for Neuromorphic Computing

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Research 2023年第2期2022卷 101-113页

作者： Zhongrong wang Wei wang Pan Liu Gongjie Liu Jiahang Li Jianhui Zhao Zhenyu Zhou Jingjuan wang Yifei Pei Zhen Zhao Jiaxin Li Lei wang Zixuan Jian Yichao wang Jianxin Guo Xiaobing Yan Key Laboratory of Brain-Like Neuromorphic Devices and Systems of Hebei Province College of Electronic and Information EngineeringHebei UniversityBaoding 071002China Department of Clinical Laboratory Medicine Taizhou Central Hospital(Taizhou University Hospital)Taizhou 318000China College of Physics Science and Technology Hebei UniversityBaoding 071002China

As the emerging member of zero-dimension transition metal dichalcogenide,WSe2 quantum dots(QDs)have been applied to memristors and exhibited better resistance switching characteristics and miniaturization ***,low powe... 详细信息

关键词： Quantum dimension reliability

Level set band method: A combination of density-based and level set methods for the topology optimization of continuums

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Frontiers of Mechanical Engineering 2020年第3期15卷 390-405页

作者： Peng WEI Wenwen wang Yang YANG Michael Yu wang School of Civil Engineering and Transportation State Key Laboratory of Subtropical Building ScienceSouth China University of TechnologyGuangzhou 510641China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116024China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyHong KongChina

The level set method(LSM),which is transplanted from the computer graphics field,has been successfully introduced into the structural topology optimization field for about two decades,but it still has not been widely applied to practical engineering problems as density-based methods *** of the reasons is that it acts as a boundary evolution algorithm,which is not as flexible as density-based methods at controlling topology *** this study,a level set band method is proposed to overcome this drawback in handling topology changes in the level set *** scheme is proposed to improve the continuity of objective and constraint functions by incorporating one parameter,namely,level set band,to seamlessly combine LSM and density-based method to utilize their *** proposed method demonstrates a flexible topology change by applying a certain size of the level set band and can converge to a clear boundary representation *** method is easy to implement for improving existing LSMs and does not require the introduction of penalization or filtering factors that are prone to numerical *** 2D and 3D numerical examples of compliance minimization problems are studied to illustrate the effects of the proposed method.

关键词： level set method topology optimization density-based method level set band

Application of Bionic Technology in Marine Cruise Equipment:Research Progress and Development Trends

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Journal of Bionic Engineering 2024年第3期21卷 1117-1155页

作者： Kunhui Luo Lan Yan Zhiyi Zhu Zhongqiu wang Hongru wang Feng Jiang School of Electromechanical and Automation Huaqiao UniversityXiamen36102China National Local Joint Engineering Research Center for Intelligent Manufacturing Technology of Brittle Material Products Xiamen361021China Institute of Oceanographic Instrumentation Shandong Academy of SciencesQilu University of Technology(Shandong Academy of Sciences)Qingdao266100China Shandong Provincial Key Laboratory of Marine Monitoring Instrument Equipment Technology Qingdao266100China National Engineering and Technological Research Center of Marine Monitoring Equipment Qingdao266100China Institute of Manufacturing Engineering Huaqiao UniversityXiamen361021China

This article provides an overview of the application of bionic technology in marine cruising equipment,discussing its research progress and future development *** cruising is a crucial means of gaining insights into the marine environment and conducting scientific ***,conventional marine cruising equipment faces numerous challenges when dealing with complex and ever-changing marine *** technology,as a means of drawing inspiration from the structure and functions of living organisms,offers new approaches and methods to address the challenges faced by marine cruising equipment and has found widespread *** article primarily focuses on the applications and historical developments of bionic technology in propulsion methods,drag reduction,and surface *** summarizes the design principles,manufacturing techniques,and optimization methods for marine biomimetic cruising ***,this paper analyzes the achievements,challenges,and future directions of bionic technology in marine cruising *** application of bionic technology in marine cruising equipment holds vast potential for development,enabling us to better confront the challenges of marine exploration and research by drawing wisdom from nature and driving advancements in marine science.

关键词： Marine cruising equipment Bionic technology Propulsion methods Drag reduction Surface antifouling

Vacancy-modified bimetallic FeMoS_(x)/CoNiP_(x) heterostructure array for efficient seawater splitting and Zn-air battery

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Journal of Energy Chemistry 2023年第6期81卷 533-542,I0012页

作者： Ansheng wang Shan Gao Jiaguo Yan Chunning Zhao Meng Yu Weichao wang Integrated Circuits and Smart System Lab(Shenzhen) Renewable Energy Conversion and Storage CenterTianjin Key Laboratory of Photo-Electronic Thin Film Device and TechnologyCollege of Electronic Information and Optical EngineeringNankai UniversityTianjin 300071China Department of Physical Science and Technology Ningbo UniversityNingbo 315211ZhejiangChina Division of Oilfield Chemicals China Oilfield Services LimitedTianjin 300452China

The development of highly efficient OER catalysts with superior durability for seawater electrolysis and Zn-air battery is important but ***,the vacancy-modified heterostructured bimetallic Fe Mo S_(x)/Co Ni P_(x)OER electrocatalyst is *** from the electron redistribution and reaction kinetics modulation resulting from vacancy introduction and heterojunction formation,it yields ultralow OER overpotentials of 196,276,303 m V in 1 M KOH and 197,318,348 m V in 1 M KOH+seawater at 10,500,1000 m A cm^(-2),respectively,surviving 600 h at 800 m A cm^(-2)without obvious ***,FeMoS_(x)/CoNiP_(x)-based Zn-air battery not only affords the high peak power density of 214.5 m W cm^(-2)but also exhibits the small voltage gap of 0.698 V and long lifetime of 500 h at 10 m A cm^(-2),overmatching overwhelming majority of reported advanced *** is revealed experimentally that the OER process on rationally designed Fe Mo S_(x)/Co Ni P_(x)follows the adsorbate evolution mechanism and the ratedetermining step shifts from^(*)OOH formation in individual building blocks to^(*)OOH deprotonation process in FeMoS_(x)/CoNiP_(x),providing the directly proof of how the vacancy introduction and heterojunction formation affect the reaction kinetics.

关键词： Vacancy Heterojunction Oxygen evolution reaction Seawater splitting Zn-air battery

Numerical Simulation of Charging Performance of Combined Sensible-Latent Heat Storage System with a Macro-Encapsulation Method

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Journal of Thermal Science 2023年第6期32卷 2008-2017页

作者： wang Wei PAN Zhenfei LEI Biao WU Yuting wang Jingfu MA Chongfang Key Laboratory of Enhanced Heat Transfer and Energy Conservation Ministry of EducationCollege of Energy and Power EngineeringBeijing University of TechnologyBeijing100124China Key Laboratory of Heat Transfer and Energy Conversion Beijing MunicipalityCollege of Energy and Power EngineeringBeijing University of TechnologyBeijing100124China

In recent years,heat storage system combining sensible and latent heat materials has received more and more *** this paper,we proposed the hybrid configuration with a macro-encapsulation,and analyzed its charging performance with different influencing factors by CFD *** the case,the sensible heat storage materials are magnesia brick or HT concrete and the phase change materials(PCMs)are mixed molten ***,we analyzed the heat transfer characteristics of the hybrid configuration in charging ***,we analyzed the effect of heating power on charging *** maximum temperature of the heating surface shall not exceed 500℃as the constraint condition,the heat storage capacity increases at first and then decreases with the heating ***,we compared the charging performance of different solid structure and the hybrid *** magnesia brick or HT concrete,the charging performance of the solid structure is better than that of the hybrid configuration,because the thermal conductivity of the molten salt is significantly lower than that of the two sensible heat storage ***,we compared the charging performance of different molten *** hybrid configuration with lower melting point molten salt has better performance because of more intensity natural ***,we analyzed the charging performance of the hybrid configuration used the composite phase change material(CPCM)with high thermal conductivity and specific *** the result,the charging performance increases by 22.5%compared with the solid *** results indicate that the hybrid configuration with the macro-encapsulation method is a potential form of thermal energy storage,but it needs to be further optimized.

关键词： thermal energy storage hybrid configuration natural convection thermophysical property charging performance

Thermodynamic property of ternary compound MgCaSi: A study from ab initio Debye-Grüneisen model

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Chinese Journal of Chemical Engineering 2021年第12期34卷 315-322页

作者： Rui Wu Ya-Ping wang Lin Shao Wei wang Bi-Yu Tang School of Chemistry and Chemical Engineering Guangxi UniversityNanning 530004China Institute of Biological Manufacturing Technology Co.Ltd Guangxi Institute of Industrial TechnologyNanning 530022China

The thermodynamic properties of Mg Ca Si and its mother phase Ca2 Si are comparatively investigated from ab initio calculations and quasi-harmonic Debye-Grüneisen model. At 0 K, Mg Ca Si is more thermodynamically stable. Under high temperature, the advantage of higher thermodynamically stability of Mg Ca Si is reduced, originating from the less negative entropy contribution because the thermodynamic entropy of Mg Ca Si increases more slowly with temperature and the entropy values are slightly *** increasing temperature, the anti-softening ability for Mg Ca Si is slightly smaller due to the slightly faster decrease trend of bulk modulus than that of Ca2 Si, although the bulk modulus of Mg Ca Si is higher in the whole temperature range considered. The thermal expansion behaviors of both Mg Ca Si and Ca_(2)Si exhibit similar increase trend, although thermal expansion coefficient of MgCaSi is slightly lower and the increases is slightly slower at lower temperature. The isochoric heat capacity CVand isobaric heat capacity CPof MgCaSi and Ca_(2)Si rise nonlinearly with temperature, and both CVare close to the Dulong–Petit limit at high temperature due to the negligibly small electronic contribution. The Debye temperature of both phases decrease with increasing temperature, and the downtrend for Mg Ca Si is slightly ***, MgCaSi possess slightly higher Debye temperature, implying the stronger chemical bonds and higher thermal conductivity than the mother phase Ca_(2)Si. The Grüneisen parameter of MgCaSi and Ca_(2)Si increase slightly with temperature, the values of MgCaSi are slightly larger. The investigation of electronic structures shows that with substitution of partial Ca by Mg in Ca_(2)Si, the stronger MgASi,MgACa and SiASi covalent bonds are formed, and plays a very significant role for the structural stability and mechanical properties.

关键词： MgCaSi alloys Density functional theory Thermodynamic properties Structural stabilities Quasi-harmonic Debye-Grüneisen model

Recent Progress in Emerging Two‑Dimensional Transition Metal Carbides

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Nano-Micro Letters 2021年第11期13卷 375-408页

作者： Tianchen Qin Zegao wang Yuqing wang Flemming Besenbacher Michal Otyepka Mingdong Dong College of Materials Science and Engineering Sichuan UniversityChengdu 610065People’s Republic of China Interdisciplinary Nanoscience Center Aarhus University8000 AarhusDenmark Regional Centre of Advanced Technologies and Materials Department of Physical ChemistryFaculty of SciencePalacky University77146 OlomoucCzech Republic

As a new member in two-dimensional materials family,transition metal carbides(TMCs)have many excellent properties,such as chemical stability,in-plane anisotropy,high conductivity and flexibility,and remarkable energy conversation efficiency,which predispose them for promising applications as transparent electrode,flexible electronics,broadband photodetectors and battery ***,up to now,their device applications are in the early stage,especially because their controllable synthesis is still a great *** review systematically summarized the state-of-the-art research in this rapidly developing field with particular focus on structure,property,synthesis and applicability of ***,the current challenges and future perspectives are outlined for the application of 2D TMCs.

关键词： Two-dimensional transition metal carbides Phase diagram Superconductivity Energy conversation and storage Largescale synthesis