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Asymmetric fireproof gel polymer electrolyte constructed by boron-contained covalent organic framework for dendrite-free sodium metal battery

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Nano Research 2024年第11期17卷 9679-9687页

作者： zhanming liu Rui Wang Jiayi Yu Zhengrui Miao Zijian Xu Jianguo Ren Suli Chen Tianxi liu Key Laboratory of Synthetic and Biological Colloids Ministry of Education School of Chemical and Material Engineering Jiangnan University Wuxi 214122 China BTR New Material Group Co. Ltd. Shenzhen 518000 China

Gel polymer electrolytes (GPEs) with flexibility, easy processability, and low cost have been regarded as promising alternatives for conventional liquid electrolytes in next-generation sodium metal batteries (SMBs). However, GPEs often suffer from combustion risk and inferior interfacial compatibility toward Na metal anode, which severely limit their wide commercial applications. Here, a rational design of asymmetric fireproof GPE (AFGPE) modified with a boron-contained covalent organic framework (BCOF) on one side is developed through in-situ crosslinking polymerization process. Benefiting from the unique structure and composition, the resulting AFGPE exhibits high Na+ transference number, wide electrochemical window, excellent mechanical properties and high safety. Especially, the nanoscale BCOF layer with uniform nanochannels works as ion sieve that homogenizes Na+ flux during Na plating process, while the abundant Lewis-acid B sites can strongly capture counter anions and decrease space charge layer at anode side, thus promoting the uniform Na deposition to effectively suppress dendrite growth. Consequently, the Na/AFGPE/Na symmetric cells demonstrate remarkable cycling stability for over 1200 h at 0.1 mA·cm^(-2), and the solid-state SMBs exhibit outstanding cycling properties and rate capability, delivering a high capacity retention of 96.4% under current density of 1 C for over 1000 cycles.

关键词： gel polymer electrolyte sodium metal battery covalent organic framework flame-retardant interfacial stability

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Discussion on Network Classroom Teaching of the Meteorology and Climatology in Common Colleges and Universities

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Meteorological and Environmental Research 2020年第5期11卷 135-136页

作者： zhanming liu School of Environmental and Chemical Engineering Foshan UniversityFoshan 528000China

Most of the content of the course Meteorology and Climatology in common colleges and universities is what students are interested in,and most students have been exposed to or understood many *** studying this part of the content,students often show varying degrees of *** course,each student s own situation is *** classroom teaching,teachers should comprehensively consider various *** in the network classroom teaching situation,teachers should combine the learning content to use multi platform teaching in the teaching,students performance to flexibly carry out interaction between teachers and students,and students own situation to pay attention to individualized cultivation.

关键词： Network classroom teaching in colleges and universities Cultivation of individualization Discussion Meteorology and climatology

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Analysis on Change Characteristics of PCD and PCP in Beijiang River Basin

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Meteorological and Environmental Research 2018年第6期9卷 1-4页

作者： liu zhanming Research Center for Ecological Civilization Construction and Sustainable Development in Xijiang & Beijiang River Basin of Guangdong Province Foshan University

Based on the daily precipitation data between 1965 and 2009 from 18 rainfall stations in Guangdong Beijiang River basin and the definitions of Precipitation Concentration Degree(PCD) and Precipitation Concentration Period(PCP),the inhomogeneous distribution characteristics of interannual precipitation were analyzed by introducing the spatial distribution of annual mean values,variable coefficients,correlation coefficients between annual precipitation,change trends and composite analysis. The results showed that(1) PCD mainly decreased from south to north in spatial distribution; PCP was earlier in most of north-central basin,but relatively later in southern basin.(2) Annual precipitation would increase if PCD decreased in most of river basin,and annual precipitation would decrease as PCP lagged in southern basin,but the change trend was the opposite in northern basin.(3) PCD and PCP mainly showed insignificant upward trend in the entire basin by Mann-Kendall test.

关键词： Precipitation concentration degree Precipitation concentration period Beijiang River basin Inverse distance weighted interpolation

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Some Thoughts on Network Teaching of the Environmental Hydrology in Common Colleges and Universities

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Meteorological and Environmental Research 2020年第6期11卷 38-39页

作者： zhanming liu School of Environmental and Chemical Engineering Foshan UniversityFoshan 528000China

In the second term of 2019-2020,colleges and universities have launched a network teaching mode due to"novel coronavirus pneumonia"*** courses in colleges and universities are diversified due to the difference of *** the Environmental Hydrology,students often show different degrees of interest in learning this *** course,each student s own situation is *** should consider a variety of factors in online classroom,pay more attention to students performance,and give appropriate guidance in time.

关键词： Network teaching Stimulating interest Guidance Environmental hydrology

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Analysis of Intra-annual Heterogeneous Characteristics of Precipitation in Shaoguan City

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Meteorological and Environmental Research 2018年第1期9卷 15-19页

作者： liu zhanming Research Center for Ecological Civilization Construction and Sustainable Development in Xijiang & Beijiang River Basin of Guangdong Province Foshan University

Based on the daily precipitation data between 1965 and 2009 from 8 rainfall stations in Shaoguan City,the indexes of precipitation concentration degree（ PCD） and precipitation concentration period（ PCP） were calculated. And then inverse distance weighted（ IDW） interpolation method was used to analyze the heterogeneous distribution characteristics of inter-annual precipitation by introducing the spatial distribution of annual mean values,variable coefficients,correlation coefficients with annual precipitation,change trends and composite analysis. The results showed that PCD was mainly decreasing from southeast to northwest in spatial distribution,long-term average annual values of PCP were distributed in the first ten days of June at most region. Annual precipitation increased as PCD increased in southern region,but the change trend was the opposite in northern region. Annual precipitation increased as PCP lagged in most region. PCD and PCP mainly appeared upward trend. Composite analysis of PCD in more-precipitation years was similar to less-precipitation years in spatial distribution,but the PCD in less-precipitation years was *** from the mean in the whole region,PCP in more-precipitation years lagged about 20 days behind those in less-precipitation years. The research can provide basis for the production of agriculture and industry as well as disaster prevention and reduction.

关键词： Heterogeneity Precipitation concentration degree Precipitation concentration period Shaoguan City Inverse distance weighted interpolation

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Probability Distribution Characteristics of Extreme Rainfall in Beijiang River Basin

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Meteorological and Environmental Research 2018年第3期9卷 10-13,17页

作者： liu zhanming Wei Xinghu Research Center for Ecological Civilization Construction and Sustainable Development in Xijiang & Beijiang River Basin of Guangdong Province Foshan University

7 kinds of probability distribution functions were used to fit extreme rainfall indexes R1d（ the maximum 1-d rainfall in the year） and R5d（ the maximum continuous 5-d rainfall in the year） at 18 observation stations of Beijiang River basin,and linear moment method was used to estimate parameters. According to fitting goodness test,the best probability distribution function was determined. On this basis,spatial analysis of design values of R1d and R5d with 50-a and 100-a reappearance periods was conducted. Via further selection,GH Copula was taken as connection function,and R1d-R5d joint probability distribution in the basin was studied. The results showed that R1d or R5d probability with 50-a and 100-a reappearance periods was larger in Wengyuan and Qingyuan,while R1d and R5d co-occurrence probability with 50-a and 100-a reappearance periods was larger in central north region.

关键词： Extreme rainfall index Copula function Beijiang River basin

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洪水峰量联合分布的4种重现水平对比

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中山大学学报（自然科学版） 2018年第1期57卷 130-135页

作者：陈子燊刘占明赵青中山大学地理学院广东广州510275 佛山科学技术学院广东佛山528000 中山市南区水利所广东中山528455

基于Archimedean copula函数、Kendall和生存Kendall函数对比分析洪峰和洪量联合分布的四种重现水平。以增江麒麟咀水文站年最大洪峰与相应的洪量样本为例,择优选用Gumbel-Hougaard copula计算洪水峰量联合分布的"或"重现期、"且"重现期... 详细信息

基于Archimedean copula函数、Kendall和生存Kendall函数对比分析洪峰和洪量联合分布的四种重现水平。以增江麒麟咀水文站年最大洪峰与相应的洪量样本为例,择优选用Gumbel-Hougaard copula计算洪水峰量联合分布的"或"重现期、"且"重现期,Kendall重现期和生存Kendall重现期及其最可能的设计洪水值。对比不同的洪水重现期发现:(1)相对于"或"联合重现期,Kendall重现期能更准确地反映洪水峰量联合分布的风险率;(2)相对于"且"联合重现期,生存Kendall重现期可更准确地反映洪水峰量同时超阈值的风险率;(3)按目前有关规范设计要求的单变量洪水要素设计值已达安全标准,按两变量"或"重现期和两变量洪水同频率设计值推算的洪水设计值偏高,以最大可能概率推算的两变量洪水要素的Kendall重现期和生存Kendall重现期设计值可为防洪工程安全与风险管理提供新的选择。

关键词：洪水风险评估 “或”重现期 “且”重现期 Kendall重现期生存Kendall重现期

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基于Copula函数和SPEI的广东北江流域干旱频率分析

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中山大学学报（自然科学版） 2014年第5期53卷 118-125页

作者：刘占明陈子燊黄强刘曾美中山大学水资源与环境系广东广州510275 华南理工大学水利水电系广东广州510640

选取广东北江流域18测站近50年日均温、日降水数据,计算出标准化降水蒸散指数(SPEI),通过游程理论确定干旱历时、烈度、烈度峰值等干旱变量;选用11种概率分布函数对干旱烈度和烈度峰值进行拟合,采用线性矩法估计参数,通过Kolmogorov-Smi... 详细信息

选取广东北江流域18测站近50年日均温、日降水数据,计算出标准化降水蒸散指数(SPEI),通过游程理论确定干旱历时、烈度、烈度峰值等干旱变量;选用11种概率分布函数对干旱烈度和烈度峰值进行拟合,采用线性矩法估计参数,通过Kolmogorov-Smirnov方法进行拟合优度检验,确定出最佳的概率分布函数,并在此基础上对干旱变量10年一遇设计值进行空间分析。通过Genest-Rivest方法及尾部相关性分析,本文选取具有上尾相关性的GH Copula作为干旱变量的联接函数,并采用相关性指标法估计参数;进而对流域干旱变量联合概率分布进行研究,以期为分析区域水量平衡及防灾减害的干旱风险管理提供科学依据。

关键词： Copula函数 SPEI 干旱频率分析北江流域广东

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西江水文干旱历时与强度的遭遇概率分析

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湖泊科学 2013年第4期25卷 576-582页

作者：陈子燊刘占明黄强中山大学地理学院水资源与环境系广州510275

利用西江下游马口水文站1959 2009年月径流量数据计算径流干旱指数,经游程理论提取了水文干旱特征值.应用Copula函数分析水文干旱强度和历时之间的联合概率分布.对构建的干旱历时和强度联合分布模式进行分析,结果表明:(1)径流干旱历时... 详细信息

利用西江下游马口水文站1959 2009年月径流量数据计算径流干旱指数,经游程理论提取了水文干旱特征值.应用Copula函数分析水文干旱强度和历时之间的联合概率分布.对构建的干旱历时和强度联合分布模式进行分析,结果表明:(1)径流干旱历时和强度之间具有高关联性,秩相关系数达0.617;(2)三参数Weibull分布较好地描述了干旱历时和强度的边缘分布特征;(3)经拟合优度检验结果优选的干旱历时和强度之间的较优连接函数为Archimedean类的Gumbel-Hougaard Copula函数;(4)5～10年重现期和20年重现期的水文干旱分别达到了重旱级别和特旱级别;(5)干旱历时和强度之间的遭遇概率可为特定干旱历时与水文干旱级别或特定干旱强度与干旱历时之间的对应关系提供概率意义上的干旱特征诊断与预测.

关键词：水文干旱径流干旱指数干旱历时与强度遭遇概率马口水文站西江

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珠江流域区域干旱风险评估

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中山大学学报（自然科学版） 2013年第5期52卷 140-147,152页

作者：黄强陈子燊刘占明孔兰中山大学水资源与环境系广东广州510275 中水珠江规划勘测设计有限公司广东广州510610

利用珠江流域42个气象站点1951-2011年的月降水与气温数据,计算了3个月尺度的标准化降水蒸散发指数,采用旋转经验正交函数时空分解方法,将珠江流域划分成了5个干旱变化特征均质性区域。并根据游程理论选取历时和强度2个特征变量,基于多... 详细信息

利用珠江流域42个气象站点1951-2011年的月降水与气温数据,计算了3个月尺度的标准化降水蒸散发指数,采用旋转经验正交函数时空分解方法,将珠江流域划分成了5个干旱变化特征均质性区域。并根据游程理论选取历时和强度2个特征变量,基于多变量区域频率分析的方法对珠江流域的干旱风险进行了评估。广义正态分布和皮尔逊三型分布分别优选为不同分区的干旱历时边缘分布,广义帕雷托分布优选为干旱强度边缘分布,区域copula函数则分别为Clayton和Arch13 copula。从区域的角度,贺江、桂江、左江和右江流域地区遭遇的干旱风险较大,应视为珠江流域的重点干旱风险区。而从行政管理的角度,广西为干旱风险管理的重点省份。

关键词：标准化降水蒸散发指数旋转经验正交函数干旱风险 copula函数多变量区域频率分析珠江流域

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