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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 *** 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 ***,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 *** the help of this research framework,the effects of CL composition on the electrical-thermal-water performance of PEMFC are *** 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 *** the selected points,the sensitivity of the decision variables is ranked:volume fraction of dry ionomer>mass of platinum>mass of carbon>agglomerate *** particular,the sensitivity of the volume fraction of dry ionomer is over 50%at these ***,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 *** 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

Advances in understanding the mechanisms of Arctic amplification

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Science China Earth Sciences 2024年第12期67卷 3814-3829页

作者： Jiefeng LI Chuanfeng ZHAO Annan CHEN Haotian ZHANG yikun yang Department of Atmospheric and Oceanic Sciences School of PhysicsPeking UniversityBeijing 100871China

The near-surface temperatures in the Arctic are increasing at more than twice the global average rate,a phenomenon known as Arctic amplification(AA).In recent years,numerous studies using ground-based and satellite observations,along with model simulations,have explored the potential mechanisms behind AA,offering a variety of observational evidence and theoretical *** the understanding of AA drivers has improved,significant uncertainties remain in quantifying the contributions of different influential *** the basis of the latest research,this article thoroughly examines the factors driving rapid warming in the Arctic,including local feedbacks,atmospheric circulation,ocean currents,and aerosols,and compares quantitative results across *** analysis highlights the complex interplay of multiple factors contributing to AA,with no clear consensus on the relative contributions of each ***,the article underscores key challenges in current research,emphasizing the need for more reliable observational data,a deeper understanding of AA mechanisms,improved model parameterizations,and the disentanglement of interactions among driving factors,all of which are essential for future investigations.

关键词： Arctic amplification Sea ice Driving mechanisms Local feedbacks Poleward transport

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 *** this paper,we propose a conceptual framework for automating the entire design process to replace current human-based HVAC design *** 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 *** this study,we analyze the importance of each process and possible ways to implement them using ***,we use a case study to test the automated design procedure and illustrate the feasibility of the new automated design *** 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)*** 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

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 *** development of next-generation sequencing technologies has enabled the analysis of the TCRb repertoire *** 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 *** 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 ***,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

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

Design,test,and verification of in-situ condition preserved coring and analysis system in lunar-based simulation environment

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International Journal of Mining Science and Technology 2024年第9期34卷 1259-1272页

作者： Haichun Hao Mingzhong Gao Yan Wu Zheng Gao Yongcheng Li Xuemin Zhou Peng Chu Xuan Wang Jiahua Li Lang Zhou Jie Song Tianxiang Ao yikun yang State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Shenzhen UniversityShenzhen 518060China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy Shenzhen UniversityShenzhen 518060China

The lunar surface and its deep layers contain abundant resources and valuable information resources,the exploration and exploitation of which are important for the sustainable development of the human economy and *** exploration and research in the field of deep space science,especially lunar-based exploration,is a scientific strategy that has been pursued in China and *** and sampling are key to accurate exploration of the desirable characteristics of deep lunar *** this study,an in-situ condition preserved coring(ICP-Coring)and analysis system,which can be used to test drilling tools and develop effective sampling strategies,was *** key features of the system include:(1)capability to replicate the extreme temperature fluctuations of the lunar environment(-185 to 200℃)with intelligent temperature control;(2)ability to maintain a vacuum environment at a scale of 10^(-3) Pa,both under unloaded conditions within Ф580 mm×1000 mm test chamber,and under loaded conditions using Ф400 mm×800 mm lunar rock simulant;(3)application of axial pressures up to 4 MPa and confining pressures up to 3.5 MPa;(4)sample rotation at any angle with a maximum sampling length of 800 mm;and(5)multiple modes of rotary-percussive drilling,controlled by penetration speed and weight on bit(WOB).Experimental studies on the drilling characteristics in the lunar rock simulant-loaded state under different drill bit-percussive-vacuum environment configurations were *** results show that the outgassing rate of the lunar soil simulant is greater than that of the lunar rock simulant and that a low-temperature environment contributes to a reduced vacuum of the lunar-based simulated *** rotary-percussive drilling method effectively shortens the sampling *** increasing sampling depth,the temperature rise of the drilling tools tends to rapidly increase,followed by slow growth or steady *** temperature rise energy accu

关键词： Lunar-based Large temperature difference Vacuum Drilling and coring System design

重庆缙云山不同林分耗水动态特征及其环境影响因素

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水土保持研究 2020年第1期27卷 126-131,138页

作者：杨易昆重庆三峡职业学院

以重庆缙云山为试验站点,于2018年1—12月,采用LI-6400 XT便携式光合测定系统测定了针阔混交林、常绿阔叶林和毛竹林3种典型林分耗水动态特征,定量分析了不同林分蒸腾、蒸发水分利用效率与环境因子的关系。结果表明:缙云山不同林分土壤... 详细信息

以重庆缙云山为试验站点,于2018年1—12月,采用LI-6400 XT便携式光合测定系统测定了针阔混交林、常绿阔叶林和毛竹林3种典型林分耗水动态特征,定量分析了不同林分蒸腾、蒸发水分利用效率与环境因子的关系。结果表明:缙云山不同林分土壤蒸发量呈“几”字形变化规律,在7—8月达到最大,4—6月呈急剧增加趋势;9月以后不同林分土壤蒸发量有所降低,相同月份土壤蒸发基本表现为针阔混交林>毛竹林>常绿阔叶林。缙云山不同林分蒸腾速率呈单峰型曲线,1—6月属于缓慢增加趋势,在7—8月达到最大,8月以后急剧降低,11—12月基于平稳趋势,相同月份蒸腾速率基本表现为常绿阔叶林>针阔混交林>毛竹林。不同林分蒸腾速率日变化规律呈单峰型曲线,从早上6:00开始,不同林分叶片蒸腾速率随着一天内光合有效辐射强度的增加、气孔开放而急剧增加,在8:00达到最大值,随后蒸腾速率缓慢降低,相同时间蒸腾速率基本表现为常绿阔叶林>针阔混交林>毛竹林。缙云山不同林分水分利用效率与蒸腾速率变化趋势相一致,二者呈显著的线性关系(p0.05),Gs和PAR对不同林分的蒸腾速率和水分利用效率贡献最大。回归分析表明,不同林分蒸腾速率和水分利用效率与生理生态因子间有线性关系,影响不同林分的蒸腾速率和水分利用效率的主导因素包括Gs和PAR。

关键词：缙云山林分蒸腾作用水分利用效率

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油气悬架耦连形式对车辆稳定性的影响

汽车工程 2017年第12期39卷 1362-1367,1389页

作者：田文朋杨宜坤王伟长安大学公路养护装备国家工程实验室西安710061 重庆创隆实业有限公司重庆401120

为各轮独立、同轴交连和对角交连3种耦连形式的油气悬架推导出其垂向力/刚度、侧倾力矩/刚度、俯仰力矩/刚度和扭转力矩/刚度公式,并据此建立了这3种油气悬架的Matlab/Simulink模型,通过仿真得到了悬架垂向、侧倾、俯仰和扭转的刚度特... 详细信息

为各轮独立、同轴交连和对角交连3种耦连形式的油气悬架推导出其垂向力/刚度、侧倾力矩/刚度、俯仰力矩/刚度和扭转力矩/刚度公式,并据此建立了这3种油气悬架的Matlab/Simulink模型,通过仿真得到了悬架垂向、侧倾、俯仰和扭转的刚度特性曲线。对油气悬架Simulink模型与整车Carsim模型进行联合仿真,分析油气悬架不同耦连形式对车辆稳定性的影响。结果表明:油气悬架耦连形式对车辆垂向振动影响较小;对角交连油气悬架的车身俯仰角最小,其它两种耦连油气悬架的车身俯仰角相同且较大;同轴交连油气悬架的车身侧倾角最小,对角交连油气悬架的车身侧倾角次之,各轮独立油气悬架的车身侧倾角最大。

关键词：油气悬架耦连刚度特性车辆稳定性

我国体育公共服务资源配置均等化水平的实证研究——基于泰尔指数的分析

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武汉体育学院学报 2014年第2期48卷 21-26页

作者：袁春梅杨依坤江西财经大学财税与公共管理学院江西南昌330013 赣南师范学院科技学院体育系江西赣州341000

运用泰尔指数法,对我国2006年至2011年体育公共服务资源配置的均等化水平进行了测度和地区结构分解。结果表明,省际体育公共服务资源配置存在明显的区域差异,群众体育场地面积的均等化水平最低、体育事业经费次之,公益性社会体育指导员... 详细信息

运用泰尔指数法,对我国2006年至2011年体育公共服务资源配置的均等化水平进行了测度和地区结构分解。结果表明,省际体育公共服务资源配置存在明显的区域差异,群众体育场地面积的均等化水平最低、体育事业经费次之,公益性社会体育指导员最高;区域内的不均等是造成体育公共服务资源均等化水平差异的主要原因;体育公共服务资源的均等化水平存在较大波动,我国体育公共服务资源配置均等化水平总体偏低,应结合地方实际,因地制宜合理规划、统筹安排体育公共服务资源的数量、规模以及种类,同时制定最低配置标准,并监督落实,促进体育公共服务均等化目标的实现。

关键词：体育公共服务均等化泰尔指数资源配置区域差异社会体育资源

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