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硫负载方式调控碳/硫复合材料结构及锂-硫电池性能研究

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西安航空学院学报 2024年第1期42卷 66-72页

作者：王彩薇姚飞贺桂铭泉肖渠成严浩西安航空学院材料工程学院西安710077

碳/硫(C/S)复合材料的硫负载方式调控可以改善聚硫化物的穿梭效应,提升锂-硫电池的容量。物理硫负载法容易导致循环过程中硫的脱落,化学硫负载法不利于倍率性能的提升。采用物理硫负载和化学硫负载相结合的方式,对提升C/S复合材料的循... 详细信息

碳/硫(C/S)复合材料的硫负载方式调控可以改善聚硫化物的穿梭效应,提升锂-硫电池的容量。物理硫负载法容易导致循环过程中硫的脱落,化学硫负载法不利于倍率性能的提升。采用物理硫负载和化学硫负载相结合的方式,对提升C/S复合材料的循环稳定性和倍率性能具有重要意义。本文控制C/S复合材料的硫负载方式,研究化学硫负载制得的C/S复合材料在热处理前后的结构和性能变化,有利于实现稳定的聚硫化物转化,提升锂-硫电池循环稳定性和倍率性能。结果表明:C/S煅烧后复合电极具有较好的循环稳定性(5C下的容量保持率为60%)和倍率性能(60 mAh·g^(-1)20C),这是因为其具有稳定的聚硫化物转化能力。

关键词：硫负载方式复合材料锂-硫电池循环稳定性倍率性能

Bidirectional propagation of lightning leader

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Chinese Science Bulletin 1999年第2期44卷 163-166页

作者： caiwei wang Muhong Yan Xinsheng Liu Yijun Zhang Wansheng Dong Cuihua Zhang Chinese Acad Sci Lanzhou Inst Plateau Atmospher Phys Lanzhou 730000 Peoples R China

The characteristics of initial leader of triggered lightning flashes are studied by use of a highspeed digital camera system with the rate of 1000 frame per second and simultaneous measurements of current and electric field change with 0.1 μs time resolution. The results show that the altitude-triggered lightning was initiated by bidirectional propagation leader because of 'current interruption' by air gap,whereas the grounded-triggered one was not. The onset of downward-moving positive leader was prior to that of the upward-going negative leader for 843 ms in an altitude-triggered lightning under the positive ambient electric field. The downward-moving leader, regardless of its polarity, would produce inhomogeneous distribution of luminosity (current) along the channel on the moment of connection to the ground.

关键词： triggered lightning leader bidirectional propagation junction process.

Visualizing light-to-electricity conversion process in InGaN/GaN multi-quantum wells with a p-n junction

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Chinese Physics B 2018年第9期27卷 157-161页

作者： Yangfeng Li Yang Jiang Shen Yan Haiyan Wu Junhui Die caiwei wang Ziguang Ma Lu wang Haiqiang Jia Wenxin wang and Hong Chen Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 1 O0190China University of Chinese Academy of Sciences Beijing 100049China

Absorption and carrier transport behavior plays an important role in the light-to-electricity conversion process, which is difficult to characterize. Here we develop a method to visualize such a conversion process in the InGaN/GaN multiquantum wells embedded in a p-n junction. Under non-resonant absorption conditions, a photocurrent was generated and the photoluminescence intensity decayed by more than 70% when the p-n junction out-circuit was switched from open to short. However, when the excitation photon energy decreased to the resonant absorption edge, the photocurrent dropped drastically and the photoluminescence under open and short circuit conditions showed similar intensity. These results indicate that the escaping of the photo-generated carriers from the quantum wells is closely related to the excitation photon energy.

关键词： multiple quantum wells p-n junction light-to-electricity photocurrent

Plasma membrane-anchored fluorescent tracker based on boron-dipyrromethene

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Chinese Journal of Chemical Engineering 2024年第8期72卷 220-225页

作者： Yucong Gong Xiangli Li Daqing Ma Lai wang Lin Zhou caiwei Lu Yi Xiao Xinfu Zhang State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart Materials Oriented Chemical EngineeringDalian University of TechnologyDalian 116024China China Academy of Safety Science and Technology Beijing 100012China

The construction of a stable-membrane tracker has significant implications for the visualization of the membrane in live ***,most current plasma trackers are not suitable for tracking plasma membranes for a long time due to their limited retention ***,Mem580-F-Sulfo is designed to target and anchor cell membranes and therefore track cell membranes for a longer *** tracker is composed of a lipophilic boron-dipyrromethene(BODIPY)derivative and a hydrophilic zwitterion to form an amphiphilic structure,which enables its targeting ability toward cell ***,a reactive ester group is included to bind with proteins through covalent bonds in cell membranes nonspecifically,which extends retention time in cell ***580-F-Sulfo shows intense brightness(94600),with a high molar absorption coefficient of up to about 100000 L·mol^(-1)·cm^(-1)and a fluorescence quantum yield of up to *** shows fast cell membrane targeting ability and long retention up to 90 *** brief,this work has not only developed a tracker with good cell membrane targetability but also provided a new strategy for improving the targeting stability of cell membranes.

关键词： Plasma membrane Protein Tracker Imaging Microstructure

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巨灾债券业务的法律性质与监管优化路径研究

金融监管研究 2021年第7期 35-51页

作者：王才伟福州大学法学院

巨灾债券旨在通过证券化的方式,转移和分散巨灾保险的风险,有助于缓解财政资金救灾抗疫的压力,提升保险公司的巨灾风险偿付能力,实现保险风险管理工具的多元化。巨灾债券业务法律性质的明确,是探求其监管路径的前提。本文运用Pireno测试... 详细信息

巨灾债券旨在通过证券化的方式,转移和分散巨灾保险的风险,有助于缓解财政资金救灾抗疫的压力,提升保险公司的巨灾风险偿付能力,实现保险风险管理工具的多元化。巨灾债券业务法律性质的明确,是探求其监管路径的前提。本文运用Pireno测试及Howey测试分别论证了巨灾债券业务的保险法属性与证券法属性,扫清其法律适用障碍。并在此基础上分析得出,在暂不存在专门监管机构时,可依据对应的法律属性明确监管主体及监管路径,进而助力我国抗疫抗灾事业。

关键词：巨灾债券法律性质监管路径

美国对华5G科技竞争策略与对策研究——基于“大战略”理论视角

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科技进步与对策 2023年第4期40卷 1-11页

作者：王才玮李光武汉大学哲学学院湖北武汉430072 武汉大学发展研究院湖北武汉430072

5G是引领未来的战略性技术,是实现产业升级的重要基础设施,也是中美科技竞争的关键领域。梳理美国对华5G科技竞争策略对于提升我国5G治理能力、创造竞争优势具有重要意义。运用“大战略”理论,从目标、手段、威胁、效益4个层面对美国5G... 详细信息

5G是引领未来的战略性技术,是实现产业升级的重要基础设施,也是中美科技竞争的关键领域。梳理美国对华5G科技竞争策略对于提升我国5G治理能力、创造竞争优势具有重要意义。运用“大战略”理论,从目标、手段、威胁、效益4个层面对美国5G策略进行分析,指出美国5G策略体现了维护国家安全和国际领导地位的目标,通过成立专职机构、加大科研投入、培养通信人才、提升频谱和基建能力等手段促进本国5G发展,并运用出口管制、外资审查、限制投资、外交结盟等方式对中国进行打压和防范。中美5G竞争日益激烈且存在彼此封闭、割裂的风险,国际关系将成为影响竞争态势的关键因素。中国应坚定战略目标,优化战略手段,应对挑战并把握机遇,积极推动中国5G健康发展。

关键词： 5G 科技政策中美科技竞争美国5G策略大战略理论

Characteristics of transfer zones under the influence of preexisting faults and regional stress transformation:Wenchang A subsag,Zhujiang River Mouth Basin,northern South China Sea

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Journal of Oceanology and Limnology 2024年第3期42卷 744-759页

作者： Wei LI Mingyue CAO Meifang MENG caiwei FAN Hui LI Jia LI Wanqiu WU Ruiqing QIN Xingan LI Yiming LIU State Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao 266580China School of Geosciences China University of Petroleum(East China)Qingdao 266580China Zhanjiang Branch China National Offshore Oil Corporation CompanyZhanjiang 524057China

A transfer zone in rift basins preserves important information on regional tectonic evolution and plays significant roles in hydrocarbon *** on the systematic analysis of 3D seismic data and hydrocarbon accumulation conditions,the geometry,kinematics,and reservoir control of a large synthetic overlapping transfer zone in the south of the Wenchang A subsag in the Zhujiang(Pearl)River Mouth basin were *** indicate that the development and evolution of the transfer zone was controlled by the interaction between pre-existing faults and regional stress *** intense rifting of the main faults of the transfer zone controlled the development of source rocks and faultcontrolled slope break *** strike-slip overprint since the Oligocene is conducive to the formation of a large-scale fault-anticline trap,and the secondary faults in the transfer zone contribute to the hydrocarbon *** conjugate intersection area of the NE-and NW-trending faults offers more opportunity for hydrocarbon migration and accumulation.

关键词： transfer zone pre-existing fault regional stress transformation Cenozoic Wenchang A Subsag Zhujiang(Pearl)River Mouth Basin

Proliferating cell nuclear antigen of Ulva prolifera is involved in the response to temperature stress

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Journal of Oceanology and Limnology 2024年第4期42卷 1227-1241页

作者： Hongyan HE Juanjuan YANG Yuan HE Xiuwen YANG caiwei FU Dongren ZHANG Jingwei DONG Aurang ZEB Jing QU Songdong SHEN School of Biology&Basic Medical Sciences Soochow UniversitySuzhou 215101China Department of Pathology Affiliated Hospital and Medical School of Nantong UniversityNantong 226001China

Ulva prolifera is the most common specie causative to green tide,and its growth is sensitive to temperature ***,the mechanisms of *** response to temperature stress remain *** this study,high temperature(36℃)stimulus promoted the death of unformed cell wall protoplasts and delayed the division of formed cell wall protoplasts,while low-temperature(4℃)stimulus did not,suggesting that the mechanisms of the response of *** to high and low temperature stresses are *** results show that proliferation-related genes were differentially expressed under high and low-temperature stresses,especially the proliferating cell nuclear antigen(PCNA)and cyclins(CYCs).Subsequently,the interaction between PCNA and Cyclin A was confirmed by Co-immunoprecipitation,yeast two-hybrid,and so ***,high-and low temperature stresses induced the expression of PCNA and Cyclin A in varying of degrees,and activated extracellular signal-regulated kinase(ERK)signal *** results suggest,PCNA,Cyclin A,and ERK signal pathway played important roles in the resistance of *** to temperature ***,high-temperature stress induced an increase of miR-2916 in abundance,and exhibiting reverse expression of PCNA;and PCNA was target gene of miR-2916,suggesting that miR-2916 protected *** from high-temperature stress via post-transcriptionally regulation of *** study laid a foundation for understanding the function of PCNA and Cyclin A,moreover,it has a guiding significance to explore the mechanisms of the response to temperature stress from proliferation-related genes regulatory networks in ***.

关键词： UIva prolifera proliferating cell nuclear antigen Cyclin A extracellular signal-regulated kinase microRNA temperature stress

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木醋液制备及形成机理研究进展

化工进展 2020年第9期39卷 3723-3738页

作者：王才威张守玉杨东杰邱学青华南理工大学化学与化工学院广东省绿色精细化学产品工程技术研究开发中心制浆造纸工程国家重点实验室广东广州510640 上海理工大学能源与动力工程学院上海200093 广东工业大学轻工化工学院广东广州510086

生物质能具有来源广泛、绿色无污染、可再生和低廉易得等优点,开发高附加值产品对生物质资源多元化利用和解决能源危机具有重要的战略意义。木醋液是生物质热解制炭工艺中的高价值酸性副产物,已被广泛应用于农业、林业、畜牧业、工业和... 详细信息

生物质能具有来源广泛、绿色无污染、可再生和低廉易得等优点,开发高附加值产品对生物质资源多元化利用和解决能源危机具有重要的战略意义。木醋液是生物质热解制炭工艺中的高价值酸性副产物,已被广泛应用于农业、林业、畜牧业、工业和医药业等多个领域,均显现出正面的促进作用。本文综述了木醋液制备工艺、理化性质、分离方法及形成机理的研究进展,从生物质组分(半纤维素、纤维素和木质素)热解的角度阐述了木醋液中主要有机化合物的形成机理。木醋液颜色呈浅黄色或红褐色,密度为1.00~1.13g/cm^3,pH为2.27~3.32,有机酸含量为2.07%~13.82%,热解温度170~350℃下制得的木醋液的物理及化学性质满足日本农用木醋液标准。文章指出木醋液富含酸类、酚类、酮类、呋喃类、醛类、醇类、酯类和醚类有机物,酸类化合物(主要是乙酸)和酚类化合物(主要是愈创木酚)使木醋液具备优良的抗微生物活性和抗氧化活性,并且酚类化合物使其具有烟熏气味的独特性质。联合不同单一分离法精制木醋液的效果最佳,可适用于不同领域的多种用途。在生物质热解过程中,游离水、吸附水和结合水随着温度升高依次析出,半纤维素、纤维素和木质素再分解成挥发性有机物质与水,共同冷凝后形成木醋液。但是,传统热解工艺制备得到木醋液的产率低及温度对成分含量的影响显著是限制木醋液发展的主要瓶颈。水热法是一种新兴的木醋液制备技术,其产率高,焦油成分少,包含的有机化合物种类更多。此外,从生物油中直接萃取也可快速制备含有相同有机组分的木醋液。因此,本文提出未来研究应着重于开发和研究高效且便捷的木醋液制备技术、分离技术及其机理,同时结合先进的催化技术与膜分离技术,以便利于制备高品质木醋液和直接地应用于不同领域,早日实现木醋液的规模化应用。

关键词：生物质热解木醋液分离形成机理