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Enhanced chemical trapping and catalytic conversion of polysulfides by diatomite/MXene hybrid interlayer for stable Li-S batteries

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Journal of Energy Chemistry 2021年第11期30卷 590-598,I0014页

作者： zehui fan Chen Zhang Wuxing Hua Huan Li Yan Jiao Jingyi Xia Chuan-Nan Geng Rongwei Meng Yingxin Liu Quanjun Tang Ziyang Lu Tongxin Shang Guowei Ling Quan-Hong Yang School of Marine Science and Technology Tianjin UniversityTianjin 300072China Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA 5005Australia Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207FujianChina

Lithium-Sulfur (Li-S) batteries with high theoretical energy density are promising energy storage systems in the next decades, while the lithium polysulfides (LiPSs) shuttling caused by the sluggish sulfur redox reaction severely lowers the practical performance. The use of interlayer between the cathode and separator has been widely investigated to physically or chemically block the LiPSs, while the introduction of catalytic materials is a more effective strategy to accelerate the conversion of LiPSs. MXene with rich surface chemistry has shown its potential for facilitating the catalytic conversion, however, the aggregation of MXene sheets usually leads to the loss of the catalytic active sites. Herein, we report a diatomite/MXene (DE/MX) hybrid material as the bifunctional interlayer for improving the adsorption/conversion of LiPSs in Li-S batteries. The diatomite with porous structure and rich silica-hydroxyl functional groups could trap LiPSs effectively, while prevent the aggregation of MXene. The DE/MX based interlayer showed bifunctions of enhancing the chemical adsorption and promoting the conversion of LiPSs. The Li-S batteries with the DE/MX interlayer delivered an improved cycling stability with a low capacity decay of 0.059% per cycle over 1000 cycles at 1.0 C. Moreover, stable 200 cycles can be realized with a high sulfur loading electrode up to 6.0 mg cm^(−2). This work provides an effective strategy to construct bifunctional interlayers for hindering the shuttling of LiPSs and boosting the practical application of Li-S batteries.

关键词： Li-S battery MXene Diatomite Polysulfides

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新型海洋材料在储能领域的应用进展

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无机盐工业 2021年第5期53卷 7-12页

作者：范泽会张辰袁博凌国维天津大学海洋科学与技术学院天津300072 联合泰泽环境科技发展有限公司

能源与环境是世界发展的两大议题。海洋资源丰富,蕴含结构多样、性质丰富的生物质材料、矿物材料等,在储能领域展现出良好的应用前景。对新型海洋材料,如海洋生物质材料、衍生碳功能材料和海洋矿物材料等在储能领域的应用做了系统评述... 详细信息

能源与环境是世界发展的两大议题。海洋资源丰富,蕴含结构多样、性质丰富的生物质材料、矿物材料等,在储能领域展现出良好的应用前景。对新型海洋材料,如海洋生物质材料、衍生碳功能材料和海洋矿物材料等在储能领域的应用做了系统评述。海洋生物质材料自然界储量丰富、环境友好,被广泛应用于储能体系的黏结剂等功能组分;海洋生物质碳化材料富含丰富的孔隙结构,作为先进电极显示出优异的应用潜力;海底矿物材料被作为电极材料和模板材料应用于储能体系中,海底矿物的开采是其未来应用的重要技术保障。对新型海洋材料的类型以及在储能领域中的应用形式做了总结,并对海洋与能源的交叉发展做了展望,以期进一步推动新型海洋材料的可持续利用。

关键词：新型海洋材料储能海洋资源

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西瓜噬酸菌Ⅲ型分泌系统hrcS基因功能分析

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植物保护学报 2023年第2期50卷 350-358页

作者：白庆荣范泽慧关巍杨琳琳杨玉文赵廷昌吉林农业大学植物保护学院长春130118 中国农业科学院植物保护研究所植物病虫害生物学国家重点实验室北京100193

为明确编码Ⅲ型分泌系统(typeⅢsecretion system,T3SS)中重要核心蛋白的hrcS基因对西瓜噬酸菌Acidovorax citrulli致病力的影响,以西瓜噬酸菌野生型菌株Aac5为对象,通过基因敲除构建hrcS基因缺失突变菌株ΔhrcS及其互补菌株ΔhrcS-comp... 详细信息

为明确编码Ⅲ型分泌系统(typeⅢsecretion system,T3SS)中重要核心蛋白的hrcS基因对西瓜噬酸菌Acidovorax citrulli致病力的影响,以西瓜噬酸菌野生型菌株Aac5为对象,通过基因敲除构建hrcS基因缺失突变菌株ΔhrcS及其互补菌株ΔhrcS-comp,测定其致病力及致病相关基因表达量、烟草过敏性反应能力、运动能力及运动能力相关基因表达量、生物膜形成能力和离体生长能力。结果显示,与野生型菌株Aac5相比,hrcS基因缺失突变菌株丧失了对寄主的致病能力和引起非寄主烟草过敏性反应能力,运动能力显著增强了191.75%,生物膜形成能力显著下降了43.90%,离体生长能力在达到对数期后呈下降趋势。hrcS基因缺失使西瓜噬酸菌T3SS中hrpG、hrpX和hrpE基因以及鞭毛fliC基因表达量显著上调,分别为野生型菌株的2.27倍、2.38倍、1.26倍和1.77倍,hrcQ基因表达量显著下调,仅为野生型菌株的50.75%。表明hrcS基因在维持西瓜噬酸菌致病能力中发挥着重要作用。

关键词：西瓜噬酸菌 Ⅲ型分泌系统 hrcS基因基因功能致病力

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Cloud Computing Based Optimal Driving for a Parallel Hybrid Electric Vehicle

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Journal of Beijing Institute of Technology 2019年第1期28卷 155-161页

作者： Jie fan Yuan Zou zehui Kong Ludger Heide National Engineering Laboratory for Electric Vehicles Beijing Institute of Technology

A cloud computing based optimal driving method is proposed and its feasibility is validated through a real-world scenario *** on principles of vehicle dynamics,the driving optimization problem has been formulated into an optimal control problem constrained by traffic rules,directed at achieving lower equivalent fuel consumption and shorter travel *** order to conveniently specify the constraints and facilitate the application of the dynamic programming(DP)algorithm,the driving optimization problem is transformed into spatial domain and discretized *** the heavy computational costs of the DP algorithm,a cloud computing based platform structure is proposed to solve the optimal driving problem in real-time.A case study is simulated based on a real-world traffic scenario in *** results demonstrate that the cloud computing framework is promising toward realizing the real-time energy management for hybrid electric vehicles.

关键词： hybrid electric vehicle cloud computing optimal driving energy management

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Circulating cell-free mtDNA as a new biomarker for cancer detection and management

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Cancer Biology & Medicine 2024年第2期21卷 105-110页

作者： fan Peng Siyuan Wang zehui Feng Kaixiang Zhou Huanqin Zhang Xu Guo Jinliang Xing Yang Liu State Key Laboratory of Holistic Integrative Management of Gastrointestinal Cancers and Xijing Hospital of Digestive Diseases Fourth Military Medical UniversityXi’an 710032China Department of Clinical Diagnosis Tangdu HospitalFourth Military Medical UniversityXi’an 710038China

Cancer is a major cause of death worldwide,and was responsible for 19.29 million new cases and 9.96 million deaths in 2020 *** total number of patients with cancer worldwide is estimated to reach 28 million by *** Ame... 详细信息

关键词： Cancer cancer death

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Visual inertial SLAM algorithm based on improved front-end point-line feature processing

Visual inertial SLAM algorithm based on improved front-end p...

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第35届中国过程控制会议

作者： zehui Wu Yunsheng fan Guofeng Wang College of Marine Electrical Engineering Dalian Maritime University

With the goal of addressing the issue of inadequate feature information extraction in indoor weak texture scenes, which can result in low tracking success or low positioning precision, a visual inertial SLAM algorithm built on improved frontend point-line feature processing is suggested. First, to enhance the accuracy of the ensuing pose estimate, the extracted ShiTomasi corner points are optimized by sub-pixel detection in the point feature processing aspect. This yields corner points with a greater position coordinate precision. Second, an improved LSD method is presented to acquire higher quality line features in line feature processing. The algorithm is validated by tests and aims to address issues with line features derived by LSD algorithm. Lastly, a real scene and the EuRoC dataset are used to test the method. The positioning accuracy of the suggested algorithm is 14.99% greater than that of VINS-Mono and 19.76% higher than that of PL-VIO, according to the data. The algorithm in this study has good positioning impact and strong robustness in the weak texture scene, as demonstrated by the real trajectory in the real scene being essentially compatible with the algorithm estimated trajectory.

关键词： Visual inertial SLAM point-line feature sub-pixel corner texture-less scenes

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非晶/超微晶合金电子变压器谐波失真实验研究

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仪器仪表学报 2011年第5期32卷 1051-1056页

作者：樊尚春陶泽辉邢维巍北京航空航天大学仪器科学与光电工程学院北京100191

针对种类繁多、特性不同的各类非晶、超微晶软磁材料的电子变压器输出信号的非线性谐波失真有着较大的差异,通过对励磁周期中磁导率变化与工作磁感应强度以及磁滞效应关系的分析,得出了输出信号的谐波失真和磁感应强度以及矩形比的关系... 详细信息

针对种类繁多、特性不同的各类非晶、超微晶软磁材料的电子变压器输出信号的非线性谐波失真有着较大的差异,通过对励磁周期中磁导率变化与工作磁感应强度以及磁滞效应关系的分析,得出了输出信号的谐波失真和磁感应强度以及矩形比的关系,并拟合了近似计算总谐波失真与磁感应强度函数和提出减小谐波失真影响的办法。经测试表明磁感应强度和矩形比对总谐波失真的影响非常明显,低矩形比、高饱和磁感应强度的非晶、超微晶软磁材料可使电子变压器的谐波降低达17 dB之多。

关键词：非晶超微晶谐波失真磁感应强度矩形比

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Using amino acid features to identify the pathogenicity of influenza B virus

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Infectious Diseases of Poverty 2022年第3期11卷 88-88页

作者： Zheng Kou Xinyue fan Junjie Li zehui Shao Xiaoli Qiang Institute of Computing Science and Technology Guangzhou UniversityGuangzhou510006China School of Computer Science and Cyber Engineering Guangzhou UniversityGuangzhou510006China

Background:Influenza B virus can cause epidemics with high pathogenicity, so it poses a serious threat to public health. A feature representation algorithm is proposed in this paper to identify the pathogenicity phenotype of influenza B ***:The dataset included all 11 influenza virus proteins encoded in eight genome segments of 1724 strains. Two types of features were hierarchically used to build the prediction model. Amino acid features were directly delivered from 67 feature descriptors and input into the random forest classifier to output informative features about the class label and probabilistic prediction. The sequential forward search strategy was used to optimize the informative features. The final features for each strain had low dimensions and included knowledge from different perspectives, which were used to build the machine learning model for pathogenicity ***:The 40 signature positions were achieved by entropy screening. Mutations at position 135 of the hemagglutinin protein had the highest entropy value (1.06). After the informative features were directly generated from the 67 random forest models, the dimensions for class and probabilistic features were optimized as 4 and 3, respectively. The optimal class features had a maximum accuracy of 94.2% and a maximum Matthews correlation coefficient of 88.4%, while the optimal probabilistic features had a maximum accuracy of 94.1% and a maximum Matthews correlation coefficient of 88.2%. The optimized features outperformed the original informative features and amino acid features from individual descriptors. The sequential forward search strategy had better performance than the classical ensemble ***:The optimized informative features had the best performance and were used to build a predictive model so as to identify the phenotype of influenza B virus with high pathogenicity and provide early risk warning for disease control.

关键词： Influenza B virus Pathogenicity Amino acid feature Machine learning

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甲基叔戊基醚裂解催化剂表征及其催化性能的研究

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石油化工 2005年第5期34卷 450-453页

作者：范存良张蕊沈霁徐泽辉上海石油化工股份有限公司化工研究所上海200540

利用X射线衍射、热重-差热分析、傅里叶变换红外光谱和吸附脱附方法对自制的固载化杂多酸催化剂进行表征。表征结果表明,活性杂多酸以无定形形态负载在载体上,其活性中心为弱L酸,催化剂的孔体积和比表面积分别为0.85mL/g和217.7m2/g。... 详细信息

利用X射线衍射、热重-差热分析、傅里叶变换红外光谱和吸附脱附方法对自制的固载化杂多酸催化剂进行表征。表征结果表明,活性杂多酸以无定形形态负载在载体上,其活性中心为弱L酸,催化剂的孔体积和比表面积分别为0.85mL/g和217.7m2/g。采用该催化剂,在等温固定床反应器中进行甲基叔戊基醚(TAME)的裂解实验,并对催化剂活性下降机理进行讨论。实验结果表明,在0.3MPa、裂解温度190～220℃、液态空速小于0.6h-1的条件下,TAME的转化率大于99%,产物中2-甲基-2-丁烯(2MB2)与2-甲基-1-丁烯(2MB1)的摩尔比大于3,有利于下游产品的应用。

关键词：甲基叔戊基醚异戊烯杂多酸催化剂裂解

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基于超微晶合金的传感器噪声匹配变压器设计

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传感技术学报 2011年第4期24卷 513-516页

作者：樊尚春陶泽辉邢维巍北京航空航天大学仪器科学与光电工程学院北京100191

为提高传感器的前置放大器的性能,克服传统变压器对放大器进行噪声匹配带来的不足,提出了采用高磁导率、低矩形比的超微晶合金材料制作噪声匹配变压器的方法。利用高磁导率、低矫顽力、低矩形比及损耗的超微晶合金材料设计用于传感器噪... 详细信息

为提高传感器的前置放大器的性能,克服传统变压器对放大器进行噪声匹配带来的不足,提出了采用高磁导率、低矩形比的超微晶合金材料制作噪声匹配变压器的方法。利用高磁导率、低矫顽力、低矩形比及损耗的超微晶合金材料设计用于传感器噪声匹配的变压器,克服传统软磁材料在诸多方面对传感器信号不利影响。从软磁材料特性及变压器等效电路着手进行分析,测试了不同类型的软磁材料对信号的实际影响效果。经测试说明VAC500F材料制作的变压器有着18.6 dB信噪比提高,低于0.1%的总谐波失真以及较高带宽和低损耗的特性,其性能比铁氧体等传统材料更优越,在用于传感器信号检测电路中更具有实用价值。

关键词：噪声匹配信噪比变压器超微晶合金

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