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Fast design of catalyst layer with optimal electrical-thermal-water performance for proton exchange membrane fuel cells

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Journal of Energy Chemistry 2023年第6期81卷 642-655,I0014页

作者： Jing Yao Yuchen yang Xiongpo Hou yikun yang Fusheng yang Zhen Wu Zaoxiao Zhang School of Chemical Engineering and Technology Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049ShaanxiChina

The catalyst layer(CL)is the core component in determining the electrical-thermal-water performance and cost of proton exchange membrane fuel cell(PEMFC).Systemic analysis and rapid prediction tools are required to improve the design efficiency of CL.In this study,a 3D multi-phase model integrated with the multi-level agglomerate model for CL is developed to describe the heat and mass transfer processes inside PEMFC.Moreover,a research framework combining the response surface method(RSM)and artificial neural network(ANN)model is proposed to conduct a quantitative analysis,and further a rapid and accurate prediction.With the help of this research framework,the effects of CL composition on the electrical-thermal-water performance of PEMFC are investigated.The results show that the mass of platinum,the mass of carbon,and the volume fraction of dry ionomer has a significant impact on the electrical-thermal-water performance.At the selected points,the sensitivity of the decision variables is ranked:volume fraction of dry ionomer>mass of platinum>mass of carbon>agglomerate radius.In particular,the sensitivity of the volume fraction of dry ionomer is over 50%at these points.Besides,the comparison results show that the ANN model could implement a more rapid and accurate prediction than the RSM model based on the same sample set.This in-depth study is beneficial to provide feasible guidance for high-performance CL design.

关键词： Catalyst layer Agglomerate model Sensitivity analysis Response surface Artificial neural network

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BIM-based automated design for HVAC system of office buildings-An experimental study

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Building Simulation 2022年第7期15卷 1177-1192页

作者： Hongxin Wang Peng Xu Huajing Sha Jiefan Gu Tong Xiao yikun yang Dingyi Zhang School of Mechanical Engineering Tongji University1239 Siping RoadShanghaiChina College of Food Science and Technology Shanghai Ocean UniversityShanghai201306China

Although computer technologies have greatly advanced in recent years and help engineers improve work efficiency,the heating,ventilation,and air conditioning(HVAC)design process is still very time-consuming.In this paper,we propose a conceptual framework for automating the entire design process to replace current human-based HVAC design procedures.This framework includes the following automated processes:building information modeling(BIM)simplification,building energy modeling(BEM)generation&load calculation,HVAC system topology generation&equipment sizing,and system diagram generation.In this study,we analyze the importance of each process and possible ways to implement them using software.Then,we use a case study to test the automated design procedure and illustrate the feasibility of the new automated design approach.The purpose of this study is to simplify the steps in the traditional rule-based HVAC system design process by introducing artificial intelligence(Al)technology based on the traditional computer-aided design(CAD)process.Experimental results show that the automatic processes are feasible,compared with the traditional design process can effectively shorten the design time from 23.37 working hours to nearly 1 hour,and improve the efficiency.

关键词： BIM BEM HVAC system automated design

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An Agent-based Adaptive Mechanism for Efficient Job Scheduling in Open and Large-scale Environments

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Journal of Systems Science and Systems Engineering 2021年第4期30卷 400-416页

作者： yikun yang Fenghui Ren Minjie Zhang School of Computing and Information Technology University of WollongongWollongongNSW2522Australia

Agent-based scheduling refers to applying intelligent agents to autonomously allocate resources to jobs.Decentralized agent-based scheduling approaches have achieved good performance in open and dynamic environments because the relationships of agents are flexible.For new jobs and resources and unexpected events,decentralized agents can respond adaptively and flexibly.Besides,decentralized approaches are easy to be extended because there is no central control agent that limits the scalability.However,decentralized approaches might have low efficiency in large-scale environments because behaviors of agents may be self-interested and competitive,due to their local views during decision making.When interacting with a large number of agents,each agent may spend a considerable amount of time on failed attempts before reaching the final agreements with other agents.To improve the efficiency of decentralized agent-based scheduling approaches in large-scale environments,and to keep the flexibility and adaptability of decentralized agents for the decision-making on scheduling,this paper provides a new agent-based adaptive mechanism for efficient job scheduling.A new type of agent named host agent is introduced to coordinate self-interested behaviors of agents without participating in the decision making of agents during job scheduling.The proposed mechanism was developed in JADE and tested in open and large-scale environments.The experimental results indicate that the proposed mechanism is effective and efficient in open and large-scale environments.

关键词： Agent-based scheduling multi-agent system resource allocation

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气溶胶对降水影响的现象和机制

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Science Bulletin 2024年第10期69卷 1569-1580页

作者：赵传峰孙悦杨杰李杰峰周月杨以坤范昊赵辛 Department of Atmospheric and Oceanic Sciences School of Physicsand China Meteorological Administration Tornado Key LaboratoryPeking UniversityBeijing 100871China Institute of Carbon Neutrality Peking UniversityBeijing 100871China Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China School of Environment Beijing Normal UniversityBeijing 100875China

Aerosols greatly influence precipitation characteristics,thereby impacting the regional climate and human life.As an indispensable factor for cloud formation and a critical radiation budget regulator,aerosols can affect precipitation intensity,frequency,geographical distribution,area,and time.However,discrepancies exist among current studies due to aerosol properties,precipitation types,the vertical location of aerosols and meteorological conditions.The development of technology has driven advances in current research,but understanding the aerosol effects on precipitation remain complex and challenging.This paper revolves around the following topics from the two perspectives of Aerosol-Radiation Interaction(ARI)and Aerosol-Cloud Interaction(ACI):(1)the influence of different vertical locations of absorbing/scattering aerosols on the atmospheric thermal structure;(2)the fundamental theories of ARI reducing surface wind speed,redistributing water vapour and energy,and then modulating precipitation intensity;(3)different aerosol types(absorbing versus scattering)and aerosol concentrations causing different precipitation diurnal and weekly variations;(4)microphysical processes(cloud water competition,invigoration effect,and evaporation cooling)and observational evidence of different effects of aerosols on precipitation intensity,including enhancing,inhibiting,and transitional effects from enhancement to suppression;and(5)how meteorology,water vapor and dynamics influencing the effect of ACI and ARI on precipitation.In addition,this review lists the existing issues and future research directions for attaining a more comprehensive understanding of aerosol effects on precipitation.Overall,this review advances our understanding of aerosol effects on precipitation and could guide the improvement of weather and climate models to predict complex aerosol-precipitation interactions more accurately.

关键词： Aerosol Precipitation Aerosol-Radiation Interaction(ARI) Aerosol-Cloud Interaction(ACI) Mechanism

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Characterization of Distinct T Cell Receptor Repertoires in Tumor and Distant Non-tumor Tissues from Lung Cancer Patients

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Genomics, Proteomics & Bioinformatics 2019年第3期17卷 287-296页

作者： Xiang Wang Botao Zhang yikun yang Jiawei Zhu Shujun Cheng Yousheng Mao Lin Feng Ting Xiao State Key Laboratory of Molecular Oncology Department of Etiology and CarcinogenesisNational Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical College Department of Thoracic Surgery National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical College

T cells and T cell receptors(TCRs)play pivotal roles in adaptive immune responses against tumors.The development of next-generation sequencing technologies has enabled the analysis of the TCRb repertoire usage.Given the scarce investigations on the TCR repertoire in lung cancer tissues,in this study,we analyzed TCRb repertoires in lung cancer tissues and the matched distant non-tumor lung tissues(normal lung tissues)from 15 lung cancer patients.Based on our results,the general distribution of T cell clones was similar between cancer tissues and normal lung tissues;however,the proportion of highly expanded clones was significantly higher in normal lung tissues than in cancer tissues(0.021%±0.002%vs.0.016%±0.001%,P=0.0054,Wilcoxon signed rank test).In addition,a significantly higher TCR diversity was observed in cancer tissues than in normal lung tissues(431.37±305.96 vs.166.20±101.58,P=0.0075,Mann-Whitney U test).Moreover,younger patients had a significantly higher TCR diversity than older patients(640.7±295.3 vs.291.8±233.6,P=0.036,Mann-Whitney U test),and the higher TCR diversity in tumors was significantly associated with worse cancer outcomes.Thus,we provided a comprehensive comparison of the TCR repertoires between cancer tissues and matched normal lung tissues and demonstrated the presence of distinct T cell immune microenvironments in lung cancer patients.

关键词： Adaptive immune response T cell receptor repertoire Lung cancer High-throughput sequencing TCR diversity

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Aerosol characteristics and impacts on weather and climate over the Tibetan Plateau

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National Science Review 2020年第3期7卷 492-495页

作者： Chuanfeng Zhao yikun yang Hao Fan Jianping Huang Yunfei Fu Xiaoye Zhang Shichang Kang Zhiyuan Cong Husi Letu Massimo Menenti State Key Laboratory of Earth Surface Processes and Resource Ecology and College of Global Change and Earth System Science Beijing Normal University Collaborative Innovation Center for Western Ecological Safety College of Atmospheric Sciences Lanzhou University School of Earth and Space Sciences University of Science and Technology of China Institute of Atmospheric Composition Chinese Academy of Meteorological Sciences State Key Laboratory of Cryospheric Sciences Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences

With the most massive snow and ice globally between 60°S and 60°N, the Tibetan Plateau (TP), also called the third pole of the world, plays significant roles in the weather, climate and lives in South Asia and East Asia and even the world [1–3].Investigating the variation of weather and the climate system over the TP has long been carried out, which is signif-

关键词： Aerosol characteristics and impacts on weather and climate over the Tibetan Plateau

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非酿酒酵母对葡萄酒风味影响的研究进展

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中国酿造 2024年第3期43卷 13-20页

作者：张晴雯邓杰杨易坤卫春会任志强黄治国四川轻化工大学酿酒生物技术及应用四川省重点实验室四川宜宾644000 四川轻化工大学中国轻工业酿酒生物技术及智能制造重点实验室四川宜宾644000

随着经济发展,消费者对葡萄酒的风味品质要求不断提高,葡萄酒的风味物质逐渐成为研究热点。非酿酒酵母(non-Saccharomyces)在葡萄酒自然发酵过程中普遍存在,其生长代谢对葡萄酒风味具有重要影响。了解非酿酒酵母菌群在葡萄酒自然发酵过... 详细信息

随着经济发展,消费者对葡萄酒的风味品质要求不断提高,葡萄酒的风味物质逐渐成为研究热点。非酿酒酵母(non-Saccharomyces)在葡萄酒自然发酵过程中普遍存在,其生长代谢对葡萄酒风味具有重要影响。了解非酿酒酵母菌群在葡萄酒自然发酵过程中的动态变化、代谢特性,有助于认识、调控其积极作用。为更好的利用非酿酒酵母,改进葡萄酒风味发酵技术,该文综述了非酿酒酵母在发酵过程中的动态变化和产酶特性、风味代谢产物特征,并对该领域未来发展方向进行了展望,以期对后期研究提供参考。

关键词：非酿酒酵母产酶特性风味代谢物

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Operando investigation of particle re-entrainment mechanism in electrostatic capture process on the lab-on-a-chip

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Journal of Environmental Sciences 2024年第2期136卷 337-347页

作者： Yong Zhu yikun Zhang Xiaoyong yang Shanlong Tao Mingxia Chen Wenfeng Shangguan Research Center for Combustion and Environmental Technology School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Inhalable particle is a harmful air pollutant that causes a significant threat to people's health and ecological environments,which should be removed to purify air,but there exists limited removal efficiency due to particle re-entrainment.Here,Operando observation system based on microscopic visualization method is developed to make in situ test of particle migration,deposition and re-entrainment characteristics on a lab-on-a-chip to achieve the investigation in micro-level scale.The deposition evolution of charged particles is recorded in electric field region intuitively,which confirms the fracture of particle chain occurs during the growth process of deposited particles.It captures the instantaneous process that a larger particle with micron size due to the coagulation of submicron particles fractures from main body of the particle chain for the first time.The analysis of migration behavior of a single submicron particle near electrode surface demonstrates the direct influence of drag force on the fracture of particle chain.This work is the first-time visualization of dynamic process and mechanism elucidation of particle re-entrainment at the micron level,and the findings will provide the theory support for the particle re-entrainment mechanism and bring inspires of enhancing capture efficiency of inhalable particle.

关键词： Inhalable particle Re-entrainment mechanism Operando observation Lab-on-a-chip Capture efficiency

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Decoupling Algorithms for the Gravitational Wave Spacecraft

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 325-337页

作者： XueWang Weizhou Zhu Zhao Cui Xingguang Qian Jinke yang Jianjun Jia yikun Wang Key Laboratory of Space Active Opto-Electronics Technology Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai200083China University of Chinese Academy of Sciences Beijing100049China Key Laboratory of GravitationalWave Precision Measurement of Zhejiang Province Hangzhou Institute for Advanced StudyHangzhou310024China

The gravitational wave spacecraft is a complex multi-input multi-output dynamic system.The gravitational wave detection mission requires the spacecraft to achieve single spacecraft with two laser links and high-precision control.Establishing one spacecraftwith two laser links,compared to one spacecraft with a single laser link,requires an upgraded decoupling algorithmfor the link establishment.The decoupling algorithmwe designed reassigns the degrees of freedomand forces in the control loop to ensure sufficient degrees of freedomfor optical axis control.In addressing the distinct dynamic characteristics of different degrees of freedom,a transfer function compensation method is used in the decoupling process to further minimize motion coupling.The open-loop frequency response of the systemis obtained through simulation.The upgraded decoupling algorithms effectively reduce the open-loop frequency response by 30 dB.The transfer function compensation method efficiently suppresses the coupling of low-frequency noise.

关键词： Gravitational waves spacecraft laser acquisition decoupling algorithms dynamical model optical axis control

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Recent advances and challenges of nitrogen/nitrate electro catalytic reduction to ammonia synthesis

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Frontiers in Energy 2024年第2期18卷 128-140页

作者： Junwen CAO yikun HU Yun ZHENG Wenqiang ZHANG Bo YU Institute of Nuclear and New Energy Technology(INET) Collaborative Innovation Center of Advanced Nuclear Energy TechnologyTsinghua UniversityBeijing 100084China Department of Chemical Engineering University of WaterlooWaterlooOntario N2L 3G1Canada Institute of New Energy Materials and Engineering School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China

The Haber-Bosch process is the most widely used synthetic ammonia technology at present.Since its invention,it has provided an important guarantee for global food security.However,the traditional Haber-Bosch ammonia synthesis process consumes a lot of energy and causes serious environmental pollution.Under the serious pressure of energy and environment,a green,clean,and sustainable ammonia synthesis route is urgently needed.Electrochemical synthesis of ammonia is a green and mild new method for preparing ammonia,which can directly convert nitrogen or nitrate into ammonia using electricity driven by solar,wind,or water energy,without greenhouse gas and toxic gas emissions.Herein,the basic mechanism of the nitrogen reduction reaction(NRR)to ammonia and nitrate reduction reaction(NO_(3)^(-))to ammonia were discussed.The representative approaches and major technologies,such as lithium mediated electrolysis and solid oxide electrolysis cell(SOEC)electrolysis for NRR,high activity catalyst and advanced electrochemical device fabrication for(NO_(3)^(-))RR and electrochemical ammonia synthesis were summarized.Based on the above discussion and analysis,the main challenges and development directions for electrochemical ammonia synthesis were further proposed.

关键词： electrochemical ammonia synthesis nitrogen nitrate nitrogen reduction reaction(NRR)to ammonia nitrate reduction reaction(NO_(3)^(-))RR

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