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A comprehensive review of the modeling of transport phenomenon in the flow channels of polymer electrolyte membrane fuel cells

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Frontiers of Chemical Science and Engineering 2024年第8期18卷 123-161页

作者： Niyi Olukayode Shenrong Ye Mingruo Hu Yanjun Dai Rui Chen Sheng Sui institute of Fuel Cell Shanghai Jiao Tong UniversityShanghai 200240China institute of Refrigeration and Cryogenics Shanghai Jiao Tong UniversityShanghai 200240China Low Carbon Engineering Loughborough UniversityLoughborough Leicestershire LE113TUUK

Reactant gas and liquid water transport phenomena in the flow channels are complex and critical to the performance and durability of polymer electrolyte membrane fuel *** polymer membrane needs water at an optimum level for proton *** management involves the prevention of dehydration,waterlogging,and the cell’s subsequent performance decline and *** process requires the study and understanding of internal two-phase *** experimental visualization techniques are used to study two-phase flows in polymer electrolyte membrane fuel ***,the experiments have limitations in in situ measurements;they are also expensive and time *** contrast,numerical modeling is cheaper and faster,providing insights into the complex multiscale processes occurring across the components of the polymer electrolyte membrane fuel *** paper introduces the recent design of flow *** reviews the numerical modeling techniques adopted for the transport phenomena therein:the two-fluid,multiphase mixture,volume of fluid,lattice Boltzmann,and pressure drop ***,this work describes,compares,and analyses the models’approaches and reviews the representative results of some selected ***,the paper summarizes the modeling perspectives,emphasizing future directions with some recommendations.

关键词： two-phase flows numerical model flow channel polymer electrolyte membrane fuel cells water management

High-throughput calculations combining machine learning to investigate the corrosion properties of binary Mg alloys

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Journal of Magnesium and Alloys 2024年第4期12卷 1406-1418页

作者： Yaowei Wang Tian Xie Qingli Tang Mingxu Wang Tao Ying Hong Zhu Xiaoqin Zeng University of Michigan-shanghai Jiao Tong University Joint institute Shanghai Jiao Tong University200240ShanghaiChina State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai200240China

Magnesium(Mg)alloys have shown great prospects as both structural and biomedical materials,while poor corrosion resistance limits their further *** this work,to avoid the time-consuming and laborious experiment trial,a high-throughput computational strategy based on first-principles calculations is designed for screening corrosion-resistant binary Mg alloy with intermetallics,from both the thermodynamic and kinetic *** stable binary Mg intermetallics with low equilibrium potential difference with respect to the Mg matrix are firstly ***,the hydrogen adsorption energies on the surfaces of these Mg intermetallics are calculated,and the corrosion exchange current density is further calculated by a hydrogen evolution reaction(HER)kinetic *** intermetallics,e.g.Y_(3)Mg,Y_(2)Mg and La_(5)Mg,are identified to be promising intermetallics which might effectively hinder the cathodic ***,machine learning(ML)models are developed to predict Mg intermetallics with proper hydrogen adsorption energy employing work function(W_(f))and weighted first ionization energy(WFIE).The generalization of the ML models is tested on five new binary Mg intermetallics with the average root mean square error(RMSE)of 0.11 *** study not only predicts some promising binary Mg intermetallics which may suppress the galvanic corrosion,but also provides a high-throughput screening strategy and ML models for the design of corrosion-resistant alloy,which can be extended to ternary Mg alloys or other alloy systems.

关键词： Mg intermetallics Corrosion property High-throughput Density functional theory Machine learning

Lubrication condition monitoring of journal bearings in diesel engine based on thermoelectricity

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Friction 2024年第11期12卷 2532-2547页

作者： Yuhao LV Hao LIU Zhigang CHEN Weijie CHANG Hui ZHANG Hulin LI shanghai Jiao Tong University Shanghai 200240China National Key Laboratory of Marine Engine Science and Technology Shanghai 201108China shanghai Marine Diesel Engine Research institute Shanghai 201108China Hunan Aviation Powerplant Research institute Aero Engine Corporation of ChinaHunan 412002China

There is still a lack of effective lubrication condition monitoring methods in the field of diesel *** paper proposes a novel thermoelectric approach to divide the lubrication state of ***,the generation mechanism of thermoelectric potential on bearings is ***,both experimental and simulation studies are done,and a strong correlation between lubrication and thermoelectric potential is *** film thickness and temperature are further confirmed as significant factors influencing thermoelectric ***,the thermoelectric potential increases with ***,a small film thickness ratio(when the film thickness ratio is less than 4)will suppress the thermoelectric *** typical lubrication states of bearings are distinguished through thermoelectric potential and supported by the Stribeck curve ***,the significant influence of lubrication on the bearing is confirmed through the analysis of surface morphology and composition.

关键词： journal bearing lubrication state,thermoelectric potential condition monitoring

An Improved Bounded Conflict-Based Search for Multi-AGV Pathfinding in Automated Container Terminals

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Computer Modeling in Engineering & Sciences 2024年第6期139卷 2705-2727页

作者： Xinci Zhou Jin Zhu shanghai Maritime University Logistics Science and Engineering Research InstituteShanghai200000China

As the number of automated guided vehicles(AGVs)within automated container terminals(ACT)continues to rise,conflicts have becomemore *** point and edge conflicts ofAGVs,amulti-AGVconflict-free path planning model has been formulated to minimize the total path length of AGVs between shore bridges and *** larger terminalmaps and complex environments,the grid method is employed to model AGVs’road *** improved bounded conflict-based search(IBCBS)algorithmtailored to ACT is proposed,leveraging the binary tree principle to resolve conflicts and employing focal search to expand the search *** experiments involving 60 AGVs indicate a reduction in computing time by 37.397%to 64.06%while maintaining the over cost within 1.019%.Numerical experiments validate the proposed algorithm’s efficacy in enhancing efficiency and ensuring solution quality.

关键词： Automated terminals multi-AGV multi-agent path finding(MAPF) conflict based search(CBS) AGV path planning

Status and trends of carbon emissions research at the county level in China

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Advances in Climate Change Research 2024年第2期15卷 338-352页

作者： Ang-Zu CAI Ru GUO Yu-Hao ZHANG Jiang WU College of Environmental Science and Engineering Institute of Environmental Planning and ManagementTongji UniversityShanghai 200092China institute of Carbon Neutrality Tongji UniversityShanghai 200092China shanghai institute of Pollution Control and Ecological Security Shanghai 200092China College of Architecture and Urban Planning Tongji UniversityShanghai 200092China Megacity Elaborated Urban Governance institute Tongji UniversityShanghai 200092China

This study provides a comprehensive overview of the challenges to achieving carbon neutrality at the county level in China and offers targeted recommendations,laying the groundwork for future specialized research in this area.A total of 283 relevant studies(2004-2023)were analyzed to assess county-level carbon emissions through three phases:bibliometric analysis,frontier analysis,and future *** findings reveal that publication trends were largely influenced by domestic and foreign *** cluster discerns ten primary themes,ranging from conceptual frameworks to research *** frontier analysis of the literature highlights the leading research areas,which include carbon neutrality pathway,driving factors,spatiotemporal variation of carbon emissions,the co-effects of pollutants and carbon reduction,and carbon emissions in China's rural *** from the results of bibliometric and frontier analyses,this study elucidates the recommendations for achieving carbon neutrality at the county level from three perspectives:effective regional policy guidance,emphasis on ecological conservation,and the deployment of advanced carbon reduction and sequestration *** study enriches the body of knowledge on carbon emissions at the county level and holds significant implications for China's comprehensive push towards achieving its carbon neutrality objectives.

关键词： Carbon emissions Emission reduction County Carbon neutrality Sustainability

Optimized RNA interference therapeutics combined with interleukin-2 mRNA for treating hepatitis B virus infection

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Signal Transduction and Targeted Therapy 2024年第7期9卷 3063-3076页

作者： Wenjing Zai Min Yang Kuan Jiang Juan Guan Huijing Wang Kongying Hu Chao Huang Jieliang Chen Wei Fu Changyou Zhan Zhenghong Yuan Key Laboratory of Medical Molecular Virology(MOE/NHC/CAMS) Research Unit of Cure of Chronic Hepatitis B Virus Infection(CAMS)Shanghai Frontiers Science Center of Pathogenic Microbes and InfectionSchool of Basic Medical SciencesShanghai Medical CollegeFudan UniversityShanghaiP.R.China Department of Pharmacology School of Basic Medical SciencesFudan UniversityShanghaiP.R.China shanghai Engineering Research Center for Synthetic immunology Fudan UniversityShanghaiP.R.China Eye institute and Department of Ophthamology Eye and ENT HospitalFudan UniversityShanghaiP.R.China Pharmacy Department of Huashan Hospital Fudan UniversityShanghaiP.R.China institute of Pediatric Translational Medicine Shanghai Institute for Pediatric Congenital Heart DiseaseShanghai Children’s Medical CenterSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina shanghai institute of Infectious Disease and Biosecurity ShanghaiP.R.China

This study aimed to develop a pan-genotypic and multifunctional small interfering RNA(siRNA)against hepatitis B virus(HBV)with an efficient delivery system for treating chronic hepatitis B(CHB),and explore combined RNA interference(RNAi)and immune modulatory modalities for better viral *** synthetic siRNAs targeting consensus motifs distributed across the whole HBV genome were designed and *** lipid nanoparticle(LNP)formulation was optimized by adopting HO-PEG_(2000)-DMG lipid and modifying the molar ratio of traditional polyethylene glycol(PEG)lipid in LNP *** efficacy and safety of this formulation in delivering siHBV(tLNP/siHBV)along with the mouse IL-2(mIL-2)mRNA(tLNP/siHBVIL2)were evaluated in the rAAVHBV1.3 mouse model.A siRNA combination(terms“siHBV”)with a genotypic coverage of 98.55%was selected,chemically modified,and encapsulated within an optimized LNP(tLNP)of high efficacy and security to fabricate a therapeutic formulation for *** results revealed that tLNP/siHBV significantly reduced the expression of viral antigens and DNA(up to 3log_(10)reduction;vs PBS)in dose-and time-dependent manners at single-dose or multi-dose frequencies,with satisfactory safety *** studies showed that tLNP/siHBVIL2 enables additive antigenic and immune control of the virus,via introducing potent HBsAg clearance through RNAi and triggering strong HBV-specific CD4^(+)and CD8^(+)T cell responses by expressed mIL-2 *** adopting tLNP as nucleic acid nanocarriers,the co-delivery of siHBV and mIL-2 mRNA enables synergistic antigenic and immune control of HBV,thus offering a promising translational therapeutic strategy for treating CHB.

关键词： formulation enable offering

Effectiveness of C-Reactive Protein as a Tuberculosis Screening Test Among HIV-Infected Individuals—shanghai,China,2021-2023

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China CDC weekly 2024年第35期6卷 891-895页

作者： Lixin Rao Zheyuan Wu Jing Chen Zhen Ning Xin Shen shanghai Municipal Center for Disease Control and Prevention ShanghaiChina

Summary What is already known about this topic?The World Health Organization(WHO)has recommended the inclusion of the C-reactive protein(CRP)test in active tuberculosis(ATB)screening algorithms among human immunodeficiency virus(HIV)-infected *** performance of the CRP test in African regions has been *** is added by this report?This study analyzed data from a big data platform of shanghai medical records together with infectious disease surveillance systems.

关键词： Infect tuberculosis records

A water-stable high-voltage P3-type cathode for sodium-ion batteries

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Chinese Chemical Letters 2024年第9期35卷 507-513页

作者： Shengyu Zhao Xuan Yu Yufeng Zhao institute for Sustainable Energy&College of Sciences Shanghai UniversityShanghai 200444China

The Na-deficient P3-type layered oxide cathode material usually experience complex in-plane Na^(+)/vacancy ordering rearrangement and undesirable P3-O3 phase transitions in the high-voltage region,leading to inferior cycling ***,they exhibit unsatisfactory stability when exposed to water for extended *** address these challenges,we propose a Cu/Ti co-doped P3-type cathode material(Na_(0.67)Ni_(0.3)Cu_(0.03)Mn_(0.6)Ti_(0.07)O_(2)),which effectively mitigates Na^(+)/vacancy ordering and suppresses P3-O3 phase transitions at high *** a result,the as-prepared sample exhibited outstanding cyclic performance,with 81.9%retention after 500 cycles within 2.5–4.15 V,and 75.7%retention after300 cycles within 2.5–4.25 ***,it demonstrates enhanced Na^(+)transport kinetics during desodiation/sodiation and reduced growth of charge transfer impedance(R_(ct))after various ***,the sample showed superb stability against water,exhibiting no discernible degradation in structure,morphology,or electrochemical *** co-doping strategy provides new insights for innovative and prospective cathode materials.

关键词： Sodium ion batteries P3-type materials Phase transition Na^(+)/vacancy ordering Water-stable cathode

Experimental Investigation on Heat Transfer and Combustion of a Stirling Engine Combustor Fueled by Reformed Gas and Diesel Fuel

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Journal of Thermal Science 2024年第5期33卷 1907-1919页

作者： LAN Jian ZHAO Yanchun LIN Guangtao LI Yelin REN Zhe LYU Tian SHEN Mengmeng GU Genxiang HAN Dong Key Laboratory for Power Machinery and Engineering Ministry of EducationShanghai Jiao Tong UniversityShanghai200240China shanghai Marine Diesel Engine Research institute Shanghai 201108China

Thermochemical recuperation heat recovery is an advanced waste heat utilization technology that can effectively recover exhaust waste heat from oxy-fuel Stirling *** novel combustor of a Stirling engine with thermochemical recuperation heat recovery system is expected to utilize both reformed gas and diesel fuels as sources of *** this research,the effects of various factors,including the H_(2)O addition,fuel distribution ratio(FDR),excess oxygen coefficient,and cyclone structure on the temperature distribution in the combustor,combustion emissions,and external combustion system efficiency of the Stirling engine were experimentally *** the increase of steam-to-carbon ratio(S/C),the temperature difference between the upper and lower heating tubes reduces and the circumferential temperature fluctuation decreases,and the combustion of diesel and reformed gas remains close to complete *** S/C=2,the external combustion efficiency is 80.6%,indicating a 1.6%decrease compared to conventional *** the increase of FDR,the temperature uniformity of the heater tube is improved,and the CO and HC emissions ***,the impact of the FDR on the maximum temperature difference and temperature fluctuation across the heater is *** the FDR rises from 21%to 38%,the external combustion efficiency increases from 87.4%to92.3%.The excess oxygen coefficient plays a secondary role in influencing temperature uniformity and temperature difference,and the reformed gas and diesel fuel can be burned efficiently at a low excess oxygen coefficient of *** an increase in the cyclone angle,the heater tube temperature increases,while the maximum temperature difference at the lower part decreases,and the temperature fluctuation ***,the CO and HC emissions increase,and the external combustion efficiency experiences a decrease.A cyclone angle of 30°is found to be an appropriate value for achieving optimal

关键词： Stirling engine fuel reforming synthetic gas oxy-combustion external combustion efficiency