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High safety separators for rechargeable lithium batteries

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Science China Chemistry 2021年第7期64卷 1131-1156页

作者： miaomiao Su Guang Huang Suqing Wang Yanjie Wang Haihui Wang School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640China Beijing Key Laboratory of Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Shenzhen Senior Technology Material Co. Ltd.Shenzhen 518106China

Lithium-ion batteries(LIBs)are presently dominant mobile power sources due to their high energy density,long lifespan,and low self-discharging *** safety of LIBs has been concerned all the time and become the main problem restricting the development of high energy density *** a significant part of LIBs,the properties of separators have a significant effect on the capacity and performances of batteries and play an important role in the safety of *** recent years,researchers devoted themselves to the development of various multi-functional safe separators from different views of methods,materials,and practical *** this review,we mainly focus on the recent progress in the development of high-safety separators with high thermal stability,good lithium dendritic resistance,high mechanical strength and novel multifunction for high-safety LIBs and have in-depth discussions regarding the separator's significant contribution to enhance the safety and performances of the ***,the future directions and challenges of separators for the next-generation high-safety and high energy density rechargeable lithium batteries are also provided.

关键词： separator high safety lithium-ion batteries

Investigating the impact of the COVID-19 pandemic on crime incidents number in different cities

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Journal of Safety Science and Resilience 2022年第4期3卷 340-352页

作者： miaomiao Hou Zhaolong Zeng Xiaofeng Hu Jinming Hu School of Information Technology and Cyber Security People’s Public Security University of ChinaBeijing 102628China

The COVID-19 pandemic is strongly affecting many aspects of human life and society around the *** investigate whether this pandemic also influences crime,the differences in crime incidents numbers before and during the pandemic in four large cities(namely Washington DC,Chicago,New York City and Los Angeles)are ***,the Granger causal relationships between crime incident numbers and new cases of COVID-19 are also *** on that,new cases of COVID-19 with significant Granger causal correlations are used to improve the crime prediction *** results show that crime is generally impacted by the COVID-19 pandemic,but it varies in different cities and with different crime *** types of crimes have seen fewer incidents numbers during the pandemic than *** Granger causal correlations are found between the COVID-19 cases and crime incidents in these *** specifically,crime incidents numbers of theft in Washington DC,Chicago and New York City,fraud in Washington DC and Los Angeles,assault in Chicago and New York City,and robbery in Los Angeles and New York City,are significantly Granger caused by the new case of *** results may be partially explained by the Routine Activity theory and Opportunity theory that people may prefer to stay at home to avoid being infected with COVID-19 during the pandemic,giving fewer chances for *** addition,involving new cases of COVID-19 as a variable can slightly improve the performance of crime prediction in terms of some specific types of *** study is expected to obtain deeper insights into the relationships between the pandemic and crime in different cities,and to provide new attempts for crime prediction during the pandemic.

关键词： COVID-19 pandemic Crime incidents numbers Crime prediction Granger causality long short-term memory network

Developing China's roadmap for air quality improvement:A review on technology development and future prospects

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Journal of Environmental Sciences 2023年第1期123卷 510-521页

作者： Yueyi Feng Miao Ning Wenbo Xue miaomiao Cheng Yu Lei Institute of Atmospheric Environment Chinese Academy of Environmental PlanningBeijing 100012China Chinese Research Academy of Environmental Sciences Beijing 100012China

Air pollution control policies in China have been experiencing profound changes,highlighting a strategic transformation from total pollutant emission control to air quality improvement,along with the shifting targets starting from acid rain and NO_(x)emissions to PM_(2.5)pollution,and then the emerging O_(3)*** marvelous achievements have been made with the dramatic decrease of SO_(2)emission and fundamental improvement of PM_(2.5)*** these achievements,China has proposed Beautiful China target through 2035 and the goal of 2030 carbon peak and 2060 carbon neutrality,which impose stricter requirements on air quality and synergistic mitigation with Greenhouse Gas(GHG)*** this background,an integrated multi-objective and multi-benefit roadmap is required to provide decision support for China’s long-term air quality improvement *** paper systematically reviews the technical system for developing the air quality improvement roadmap,which was integrated from the research output of China’s National Key R&D Program for Research on Atmospheric Pollution Factors and Control Technologies(hereafter Special NKP),covering mid-and long-term air quality target setting techniques,quantitative analysis techniques for emission reduction targets corresponding to air quality targets,and pathway optimization techniques for realizing reduction *** experience and lessons derived from the reviews have implications for the reformation of China’s air quality improvement roadmap in facing challenges of synergistic mitigation of PM_(2.5)and O_(3),and the coupling with climate change mitigation.

关键词： Air quality management Air quality targets Mitigation pathway optimization Dynamic emission scenario Cost-benefit evaluation Integrated decision-support model

液晶润滑碳化硅/聚酰亚胺配副体系摩擦性能初探

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润滑与密封 2024年第7期49卷 161-167页

作者：张靓高新蕾史淼淼程宇威王婷婷武汉轻工大学化学与环境工程学院湖北武汉430023 湖北大学材料科学与工程学院湖北武汉430062

为探究液晶作为润滑剂对碳化硅/聚酰亚胺配副体系的润滑效果以及影响系统减摩性能的因素,分别选用单分子液晶4-氰基-4′-戊基联苯(5CB)和质量分数90%5CB-10%4′-氰基-(1,1′-联苯)-4-基4-乙基环己烷-1-羧酸酯(2CEPPN)混合液晶作为润滑剂... 详细信息

为探究液晶作为润滑剂对碳化硅/聚酰亚胺配副体系的润滑效果以及影响系统减摩性能的因素,分别选用单分子液晶4-氰基-4′-戊基联苯(5CB)和质量分数90%5CB-10%4′-氰基-(1,1′-联苯)-4-基4-乙基环己烷-1-羧酸酯(2CEPPN)混合液晶作为润滑剂,使用UMT-3微摩擦试验机对碳化硅/聚酰亚胺配副体系进行摩擦学性能测试。试验结果表明:单分子液晶和混合液晶作为润滑剂,对碳化硅/聚酰亚胺配副体系都具有较好的减摩效果,甚至可以达到超滑状态,其中混合液晶比单分子液晶具有更好的减摩效果;混合液晶在低载荷及较高转速下可以获得良好的减摩效果,并且能使碳化硅/聚酰亚胺配副体系在较长时间里实现超滑行为。

关键词：液晶聚酰亚胺碳化硅超滑

3D Network nanostructured NiCoP nanosheets supported on N-doped carbon coated Ni foam as a highly active bifunctional electrocatalyst for hydrogen and oxygen evolution reactions

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Frontiers of Chemical Science and Engineering 2018年第3期12卷 417-424页

作者： miaomiao Tong Lei Wang Peng Yu Xu Liu Honggang Fu Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People's Republic of China Heilongiiang University Harbin 150080 China

A highly active bi-functional electrocatalyst towards both hydrogen and oxygen evolution reactions is critical for the water splitting. Herein, a self-supported electrode composed of 3D network nanostructured NiCoP nanosheets grown on N-doped carbon coated Ni foam （NiCoP/NF@NC） has been synthesized by a hydrothermal route and a subsequent phosphorization process. As a bifunctional electrocatalyst, the NiCoP/NF@NC electrode needs overpotentials of 31.8 mV for hydrogen evolution reaction and 308.2 mV for oxygen evolution reaction to achieve the current density of 10 mA·cm^-2 in 1 mol·L^-1 KOH electrolyte. This is much better than the correspond- ing monometal catalysts of CoP/NF@NC and NiP/ NF@NC owing to the synergistic effect. NiCoP/NF@NC also exhibits low Tafel slope, and excellent long-term stability, which are comparable to the commercial noble catalysts of Pt/C and RuO2.

关键词： bimetallic phosphides N-doped carbon self-support hydrogen evolution oxygen evolution

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长江口一次持续性强浓雾过程特征和成因分析

海洋预报 2024年第1期41卷 74-82页

作者：韩苗苗高雅文钟剑杜树浩周彤中国卫星海上测控部江苏江阴214431

使用船载观测资料、FNL再分析资料和葵花八号云图资料,对2022年3月11—14日发生于长江口的持续性浓雾过程进行研究分析,并归纳总结了预报的实用性方法。结果表明:本次浓雾过程包含辐射雾和锋面平流雾,持续时间长,影响范围广,雾区在锋面... 详细信息

使用船载观测资料、FNL再分析资料和葵花八号云图资料,对2022年3月11—14日发生于长江口的持续性浓雾过程进行研究分析,并归纳总结了预报的实用性方法。结果表明:本次浓雾过程包含辐射雾和锋面平流雾,持续时间长,影响范围广,雾区在锋面的前后部都相继出现,且锋面移动往往影响着雾的移动。在雾的生消和维持过程中,气温和相对湿度通常呈负相关,温度露点差和能见度呈正相关,当温度露点差大于3℃时,长江口也会有雾生成,但能见度不低于3 km。雾生时段通常盛行偏南风和偏北风,偏西风和西北风则会导致相对湿度迅速下降,不利于雾的形成和维持。可见光云图上雾的特征明显,颜色纹理均匀,边界清晰整齐,外围无丝状或纤维状云系扩散,而红外云图上对应处是一片灰暗区,只有边界隐约可见。

关键词：浓雾长江口雾生消过程水汽输送预报

Review on evolution and evaluation of asphalt pavement structures and materials

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Journal of Traffic and Transportation Engineering(English Edition) 2020年第5期7卷 573-599页

作者： Yu Liu Peifeng Su miaomiao Li Zhanping You Mohan Zhao School of Highway Chang'an UniversityXi'an 710064China Department of Civil and Environmental Engineering Michigan Technological UniversityHoughtonMI 49931USA

The purpose of this study was to summarize the wide-range literatures on asphalt pavements, explore the evolution of road pavements, analyze typical asphalt pavement structures, highlight current trends in research and industry, and to recommend future areas of research and development. In this research, road pavement evolution was explored from the earliest roads to the modern pavements. A new method was recommended to categorize asphalt pavement materials into the three large families which may be further sub-divided according to their mechanical parameters. A unified asphalt pavement classification(UAPC) method was proposed and the worldwide asphalt pavements could be divided into six types through the new method. Based o n the UAPC method, 1087 asphalt pavement structures were classified and analyzed to explore the asphalt thickness variation. In order to evaluate asphalt pavement performance, the Chinese design specification was employed for analyzing lives of 29 high-volume pavements and 28 low-volume pavements. Through this research, it was found that:(1) in the past 100 years, asphalt pavement materials and structures had been becoming more and more strong;(2) asphalt layer thicknesses were various from 5 to 60 cm and the overall pavement thicknesses were various from 28 to 160 cm;(3) the long-life pavements in the other countries may become"shorter-life" pavements according to the prediction based on the Chinese specification.

关键词： Road engineering Asphalt pavement Materials classification Pavement life Structural classification Road evolution

Mucosal vaccine delivery:A focus on the breakthrough of specific barriers

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Acta Pharmaceutica Sinica B 2022年第9期12卷 3456-3474页

作者： Mengwen Huang miaomiao Zhang Hongbin Zhu Xiaojiao Du Jun Wang School of Medicine South China University of TechnologyGuangzhou 510006China School of Biomedical Sciences and Engineering South China University of TechnologyGuangzhou International CampusGuangzhou 511442China National Engineering Research Center for Tissue Restoration and Reconstruction South China University of TechnologyGuangzhou 510006China Guangdong Provincial Key Laboratory of Biomedical Engineering South China University of TechnologyGuangzhou 510006China Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education South China University of TechnologyGuangzhou 510006China

Mucosal vaccines can effectively induce an immune response at the mucosal site and form the first line of defense against microbial *** induced mucosal immunity includes the proliferation of effector T cells and the production of IgG and IgA antibodies,thereby effectively blocking microbial infection and transmis ***,after a long period of development,the transformation of mucosal vaccines into clinical use is still relatively *** date,fewer than ten mucosal vaccines have been *** seven mucosal vaccines against coronavirus disease 2019(COVID-19) are under investigation in clinical trials.A representative vaccine is the adenovirus type-5 vectored COVID-19 vaccine(Ad5-nCoV) developed by Chen and coworkers,which is currently in phase Ⅲ clinical *** reason for the limited progress of mucosal vaccines may be the complicated mucosal ***,this review summarizes the characteristics of mucosal barriers and highlights strategies to overcome these barriers for effective mucosal vaccine delivery.

关键词： Mucosal vaccine Mucosal barrier Mucosal immune response Vaccine delivery Nanocarriers

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场畸变气体火花开关电气性能与烧蚀过程研究

南方电网技术 2024年第9期18卷 38-46页

作者：杨昊孙凡张璐范华峰宋治波张昊天陈苗苗西安工程大学电子信息学院国网陕西省电力有限公司电力科学研究院西安工商学院信息与工程学院

伴随着气体火花开关的广泛应用，选择工作稳定且使用寿命长的气体火花开关已经成为了脉冲功率系统稳定运行的重要保障。目前，国内外相关学者对于气体开关展开了大量研究，但多数都是基于从放电条件研究对气体火花开关烧蚀的影响。因此... 详细信息

伴随着气体火花开关的广泛应用，选择工作稳定且使用寿命长的气体火花开关已经成为了脉冲功率系统稳定运行的重要保障。目前，国内外相关学者对于气体开关展开了大量研究，但多数都是基于从放电条件研究对气体火花开关烧蚀的影响。因此从实际工程需求出发，全面研究了不同工作环境对气体火花开关的自击穿电压的分布、时延抖动、分散性的变化情况以及电极烧蚀现象与机制、宏/微观粗糙度变化规律。结果表明：相同气压条件下开关击穿电压的分散性随电极间隙的增大无明显规律变化。随着工作系数提高至90%，开关放电时延平均值基本不变，但呈现出数纳秒的波动，当间隙距离为10 mm、工作系数在60%以下时抖动的起始值及其减小的速率远高于其他间隙。随着电极间距的增大，对电极表面的烧蚀的影响较小，低气压长间隙的烧蚀程度相较于高气压短间隙的烧蚀更为明显。

关键词：气体火花开关时延抖动电极烧蚀宏/微观粗糙度