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Cobalt and nitrogen codoped porous carbon as superior bifunctional electrocatalyst for oxygen reduction and hydrogen evolution reaction in alkaline medium

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Chinese Chemical Letters 2019年第3期30卷 681-685页

作者： xiaoxia Chen Xiangjun Zhen Hongyu Gong Le Li jianwei xiao Zhi Xu Deyue Yan Guyu xiao Ruizhi Yang School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University College of Physics Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University

Cobalt and nitrogen codoped carbon materials(Co-N-C) were fabricated by pyrolysis of the mixture of poly(4-vinylpyridine) and cobalt chloride using SiO_2 nanoparticles as hard template, which were the first transition metal/nitrogen-codoped carbon bifunctional electrocatalyst derived from noncarbonizable polymer for ORR and HER. The as-made Co-N-C possessed hierarchical pore structure and high specific surface area, achieving excellent electrocatalytic performances for ORR and HER. Its ORR catalytic performances were comparable to those of Pt/C catalyst and its HER catalytic performances were superior to those of most doped carbon catalysts in KOH electrolyte. Moreover, its bifunctional electrocatalytic performances for ORR and HER were better than those of most bifunctional doped carbon catalysts in alkaline electrolyte.

关键词： Carbon Cobalt and nitrogen Doped Oxygen reduction reaction Hydrogen evolution reaction

PtrDJ1C,an atypical member of the DJ-1 superfamily,is essential for early chloroplast development and lignin deposition in poplar

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Horticultural Plant Journal 2023年第5期9卷 1039-1054页

作者： Xinwei Wang Chunxue Shao Libo Liu Yue Wang Yaqi An Hui Li Yunwei Ding Yanping Jing xiaojuan Li jianwei xiao College of Biological Sciences and Biotechnology Beijing Forestry UniversityBeijing 100083China Hebei North University ZhangjiakouHebei 075000China National Engineering Research Center of Tree Breeding and Ecological Restoration Beijing Forestry UniversityBeijing 100083China Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants Ministry of EducationCollege of Biological Sciences and BiotechnologyBeijing Forestry UniversityBeijing 100083China

The nuclear-encoded factors and the photosynthetic apparatus have been studied extensively during chloroplast ***,many questions regarding these processes remain unanswered,particularly in perennial woody *** a model material of woody plants,poplar not only has very significant value of research,but also possesses economic and ecological *** study reports the Populus trichocarpa DJ-1C(PtrDJ1C)factor,encoded by a nuclear gene,and a member of the DJ-1 ***1C knock-out with the CRISPR/Cas9 system resulted in different albino *** fluorescence and immunoblot analyses showed that the levels of photosynthetic complex proteins decreased ***,the transcript level of plastid-encoded RNA polymerase-dependent genes and the splicing efficiency of several introns were affected in the mutant ***,rRNA accumulation was abnormal,leading to developmental defects in chloroplasts and affecting lignin *** concluded that the PtrDJ1C protein is essential for early chloroplast development and lignin deposition in poplar.

关键词： PtrDJ1C Chloroplast development Gene expression Lignin Poplar

Fiber Optic Coupling of CW Linear Laser Diode Array

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Chinese Journal of Lasers 2002年第3期11卷 46-48页

作者： WANG xiaowei xiao jianwei MA xiaoyu WANG Zhongming FANG Gaozhan (National Research Center for Optoelectronic Engineering, Institute of Semiconductors, The Chinese Academy of Science, Beijing 100083, China) Institute of Semiconductors，The Chinese Academy of Science国家光电子工艺中心北京 100083 Institute of Semiconductors The Chinese Academy of Science国家光电子工艺中心北京 100083

Based on a set of microoptics the output radiation from a continuous wave (CW) linear laser diode array is coupled into a multi mode optical fiber of 400 μm diameter. The CW linear laser diode array is a 1 cm laser diode bar with 19 stripes with 100 μm aperture spaced on 500 μm centers. The coupling system contains packaged laser diode bar, fast axis collimator, slow axis collimation array, beam transformation system and focusing system. The high brightness, high power density and single fiber output of a laser diode bar is achieved. The coupling efficiency is 65% and the power density is up to 1.03×10 4 W/cm 2.

关键词： fiber coupling laser diode bar multimode optical fiber

Seroprevalence of neutralizing antibodies against HFMD associated enteroviruses among healthy individuals in Shanghai,China,2022

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Virologica Sinica 2024年第4期39卷 694-698页

作者： Jiayu Wang Wencheng Wu Wei Wang Jingyi Zhang jianwei xiao Mingyi Cai Jiaying Guo Run Li Shuangli Zhu Wanju Zhang Min Chen Zheng Teng Microbiology Department Shanghai Municipal Center for Disease Control and PreventionShanghai200336China Microbiology Department Yangpu Municipal Center for Disease Control and PreventionShanghai200090China Microbiology Department Jing’an Municipal Center for Disease Control and PreventionShanghai200070China Microbiology Department Changning Municipal Center for Disease Control and PreventionShanghai200050China WHO WPRO Regional Polio Reference Laboratory NHC Key Laboratory for BiosafetyNHC Key Laboratory for Medical VirologyNational Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijing102206China

Dear Editor,Hand,foot and mouth disease(HFMD)is one of the most common infectious diseases,particularly in the Asia-Pacific *** the past two decades,HFMD rises to prominence for its heavy burden,with over one million cases reported *** 2013,enterovirus A71(EV-A71)and Coxsackievirus A16(CVA16)were the main pathogens leading to HFMD in the mainland of China(Yang et al.,2017).In recent years,non-EV-A71-non-CVA16 other enteroviruses,such as Coxsackievirus A6(CVA6),Coxsackievirus A10(CVA10)and Coxsackievirus A4(CVA4),were frequently reported and replaced EV-A71 and CVA16 becoming the major causative agents of HFMD(Zhou et al.,2021;Wang et al.,2022).

关键词： enterovirus HFMD

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酪蛋白热解制备多孔碳及其超级电容器性能

功能高分子学报 2020年第2期33卷 172-179页

作者：肖建伟肖谷雨上海交通大学化学化工学院金属基复合材料国家重点实验室上海200240

采用天然高分子酪蛋白为碳前驱体,在酸性条件下与植酸混合,植酸与前驱体中的酪蛋白形成了酸碱交联,经低温预碳化,再用KOH高温活化,制备了高比表面积的多孔碳材料(HPC)。将HPC作为活性物质构建了水系超级电容器,分别采用三电极超级电容... 详细信息

采用天然高分子酪蛋白为碳前驱体,在酸性条件下与植酸混合,植酸与前驱体中的酪蛋白形成了酸碱交联,经低温预碳化,再用KOH高温活化,制备了高比表面积的多孔碳材料(HPC)。将HPC作为活性物质构建了水系超级电容器,分别采用三电极超级电容器和对称两电极超级电容器体系对其电化学性能进行了表征。结果表明,所得多孔碳材料的比表面积高达3 567 m^2/g。在三电极体系中,1 A/g电流密度下,HPC的比电容高达411 F/g。在两电极体系中,1 A/g电流密度下,HPC的比电容达235 F/g;在5 A/g电流密度下,8 000次充放电循环后,HPC的比电容仍达231 F/g。

关键词：酪蛋白植酸多孔碳材料超级电容器

High Power 940 nm Al-free Active Region Laser Diodes and Bars with a Broad Waveguide

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Chinese Journal of Lasers 2002年第1期11卷 10-14页

作者： FANG Gaozhan xiao jianwei MA xiaoyu XU Zuntu ZHANG Jinming TAN Manqing LIU Zongshun LIU Suping FENG xiaoming (Institute of Semiconductors, The Chinese Academy of Sciences, National Engineering Research Center for Optoelectronics Devices, Beijing Institute of Semiconductors The Chinese Academy of Sciences National Engineering Research Center for Optoelectronics Devices 北京 100083

The 940 nm Al-free active region laser diodes and bars with a broad waveguide were designed and fabricated. The stuctures were grown by metal organic chemical vapour deposition. The devices show excellent performances. The maximum output power of 6.7 W in the 100 μm broad-area laser diodes has been measured, and is 2.5 times higher than that in the Al-containing active region laser diodes with a narrow waveguide and 1.7 times higher than that in Al-free active region laser diodes with a narrow waveguide. The 19% fill-factor laser diode bars emit 33 W, and they can operate at 15W with low degradation rates.

关键词： laser diode bar waveguide Al-free

Temperature-dependent hardness of zinc-blende structured covalent materials

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Science China Materials 2021年第9期64卷 2280-2288页

作者： Xing Feng jianwei xiao Bin Wen Jijun Zhao Bo Xu Yanbin Wang Yongjun Tian Center for High Pressure Science State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Ministry of Education)Dalian University of TechnologyDalian 116024China Center for Advanced Radiation Sources University of ChicagoChicagoIllinois 60439USA

Understanding the temperature-dependent hardness of covalent materials is of fundamental scientific interest and crucial technical *** we propose a temperature-dependent hardness formula for zinc-blende structured covalent materials based on the dislocation *** results indicate that at low temperatures,the Vickers hardness is primarily modulated by Poisson’s ratio and the shear modulus,with the latter playing a dominant *** an increase in temperature,the governing mechanism for the plastic deformation switches from shuffle-set dislocation control to glide-set dislocation control,and the hardness decreases precipitously at elevated ***,the intrinsic parameter a3G is revealed for zinc-blende structured covalent materials,which represents the resistance of a material to softening at high *** temperaturedependent hardness model agrees remarkably well with the experimental data of zinc-blende structured covalent *** work not only sheds light on the physical origin of hardness,but also provides a practical guide for the design of superhard materials.

关键词： hardness temperature effect dislocation covalent materials superhard materials

Extremely　low　threshold　current　density　strained　InGaAs／AlGaAs　quantum　well　lasers　by　molecular　beam　epitaxy

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Journal of Semiconductors 1994年第8期15卷 565-568页

作者： Yang Guowen Xu Junying xiao jianwei Xu Zuntu Zhang Jingming Zheng Wanhua Zeng Yiping and Chen Lianghui(Institute of Semiconductors, The Chinese Academy of Sciences, National Integrated Optoelectronics Lob., Beijing 100083) 中科院半导体所集成光电子学联合国家重点实验室北京

ＥｘｔｒｅｍｅｌｙｌｏｗｔｈｒｅｓｈｏｌｄｃｕｒｒｅｎｔｄｅｎｓｉｔｙｓｔｒａｉｎｅｄＩｎＧａＡｓ／ＡｌＧａＡｓｑｕａｎｔｕｍｗｅｌｌｌａｓｅｒｓｂｙｍｏｌｅｃｕｌａｒｂｅａｍｅｐｉｔａｘｙ￥ＹａｎｇＧｕｏｗｅｎ；Ｘ... 详细信息

ＥｘｔｒｅｍｅｌｙｌｏｗｔｈｒｅｓｈｏｌｄｃｕｒｒｅｎｔｄｅｎｓｉｔｙｓｔｒａｉｎｅｄＩｎＧａＡｓ／ＡｌＧａＡｓｑｕａｎｔｕｍｗｅｌｌｌａｓｅｒｓｂｙｍｏｌｅｃｕｌａｒｂｅａｍｅｐｉｔａｘｙ￥ＹａｎｇＧｕｏｗｅｎ；ＸｕＪｕｎｙｉｎｇ；ＸｉａｏＪｉａｎ...

关键词： AlGaAs strained beam current density epitaxy lasers low molecular quantum Extremely InGaAs well

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大学新生心理健康水平调查

心理与行为研究 2015年第1期13卷 70-75页

作者：张录全肖建伟天津工业大学天津300387 天津师范大学天津300387

采用国家教育部中国大学生心理健康测评系统(CSPA)中的《中国大学生心理健康量表》对天津某高校3826名2013年入学的大学新生进行问卷调查,并分析大学新生心理健康水平的人口学差异。结果 :(1)大学新生整体心理健康状况较好;(2)女生的整... 详细信息

采用国家教育部中国大学生心理健康测评系统(CSPA)中的《中国大学生心理健康量表》对天津某高校3826名2013年入学的大学新生进行问卷调查,并分析大学新生心理健康水平的人口学差异。结果 :(1)大学新生整体心理健康状况较好;(2)女生的整体心理健康水平要好于男生,但女生比男生表现出更多的自卑;(3)汉族学生比少数民族学生表现出更高的焦虑;(4)独生子女的心理健康水平显著好于非独生子女;(5)理工类、文史类、文体艺术类大学新生的心理健康水平存在差异,理工类大学生的整体心理健康水平要好于文体艺术类大学新生。

关键词：大学新生心理健康问卷调查