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Crystalline 1D Linear Conjugated Polymers with a Quinoidal Unit As Metal-Free Electrocatalysts for Oxygen Reduction

ADVANCED ENERGY MATERIALS 2024年第44期14卷

作者： Fan, Renzhen Wang, Cheng Zhang, Xiaofei Zhang, xuwen Dong, Weijia Xu, Yiyang Xu, Chenhui Chi, Chunyan Zhu, Jun deng, Yunfeng Geng, Yanhou Tianjin Univ Joint Sch Natl Univ Singapore & Tianjin Univ Int Campus Binhai New City 350207 Fuzhou Peoples R China Tianjin Univ Sch Mat Sci & Engn Tianjin 300072 Peoples R China Tianjin Univ Tianjin Key Lab Mol Optoelect Sci Tianjin 300072 Peoples R China Collaborat Innovat Ctr Chem Sci & Engn Tianjin Tianjin 300072 Peoples R China Agcy Sci Tech & Res A STAR Inst Mat Res & Engn IMRE 2 Fusionopolis Way Singapore 138634 Singapore Natl Univ Singapore Dept Chem 3 Sci Dr 3 Singapore 117543 Singapore

Crystalline and soluble 1D linear conjugated polymers (LCPs) have garnered considerable interest as cost-effective and efficient metal-free electrocatalysts for the oxygen reduction reaction (ORR) due to their high exposure of catalytic sites and ease of processing. However, difficulties remain in achieving excellent ORR performance for 1D LCPs by conventional molecular design. Herein, it is demonstrated the utilization of quinoidal units as a promising strategy to develop 1D LCPs for ORR. The incorporation of quinoidal unit not only results in polymers with strong inter- and intra-molecular interactions and low-lying LUMO (lowest unoccupied molecular orbital) energy levels, but also provides polymers with good crystallinity and commendable charge carrier mobilities. The electronic properties of these polymers are fine-tuned through the introduction of additional heteroatoms and/or substituents in the monomers and comonomers to understand and optimize their ORR catalytic activity. Evaluation of their catalytic performances reveals a remarkable half-wave potential and limiting current density of up to 0.74 V (vs reversible hydrogen electrod) and 7.50 mA cm-2, respectively. Notably, these performances are achieved without the addition of carbon nanomaterials as support. This study offers a new insight into the design of highly efficient metal-free organic electrocatalysts. 1D linear conjugated polymers containing a quinoidal unit are synthesized as the metal-free electrocatalysts for oxygen reduction reaction. These polymers show good film-forming properties, well-ordered structures, and excellent charge transport abilities. As a result, they exhibit high oxygen reduction reaction catalytic activities without the need for carbon nanomaterials as support. image

关键词： conjugated polymers energy conversion metal-free oxygen reduction reaction quinoidal compounds

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Induction ofγ-aminobutyric acid plays a positive role to Arabidopsis resistance against Pseudomonas syringae^°°

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Journal of Integrative Plant Biology 2020年第11期62卷 1797-1812页

作者： Xiangxiong deng xuwen Xu Yu Liu Yan Zhang Liuyi Yang Shuqun Zhang Juan Xu State Key Laboratory of Plant Physiology and Biochemistry College of Life SciencesZhejiang UniversityHangzhou 310058China Division of Biochemistry University of MissouriColumbiaMissouri 65211USA

Gamma-aminobutyric acid(GABA)is an important metabolite which functions in plant growth,development,and stress ***,its role in plant defense and how it is regulated are largely ***,we report a detailed analysis of GABA induction during the resistance response to Pseudomonas syringae in Arabidopsis *** searching for the mechanism underlying the pathogen-responsive mitogenactivated protein kinase(MPK)3/MPK6 signaling cascade in plant immunity,we found that activation of MPK3/MPK6 greatly induced GABA biosynthesis,which is dependent on the glutamate decarboxylase genes GAD1 and *** with Pseudomonas syringae pv tomato DC3000(Pst)and Pst-avrRpt2 expressing the civrRpt2 effector gene induced GACH and GAD4 gene expression and increased the levels of *** evidence revealed that GAD1,GAD2,and GAD4 play important roles in bothGABA biosynthesis and plant resistance in response to Pst-avrRpt2 *** gad1/2/4 triple and gad1/2/4/5 quad-ruple mutants,in which the GABA levels were extremelylow,were more susceptible to both Pst and *** loss of MPK3/MPK6,or their upstream MKK4/MKK5,or their downstream substrate WRKY33 sup-pressed the induction of GAD1 and GAD4 expression afterPst-avrRpt2 *** findings shed light on both theregulation and role of GABA in the plant immunity to abacterial pathogen.

关键词： resistance Arabidopsis immunity

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基于驱动谱迭代修正算法的三轴随机振动控制研究

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机床与液压 2022年第17期50卷 206-210页

作者：陈广初邓彬陈旭雯佛山市南海区质量技术监督检测所广东佛山528200 浙江大学流体动力与机电系统国家重点实验室浙江杭州310027 浙江谱麦科技有限公司浙江宁波315103

经典的矩阵微分多输入多输出随机振动控制算法需要进行矩阵分解或矩阵微分等运算,计算复杂,不利于实时应用。针对一类低相干系数的多轴随机振动试验场景,利用牛顿法推导激励谱迭代方程,提出一种驱动谱迭代修正算法,简化了控制计算量,提... 详细信息

经典的矩阵微分多输入多输出随机振动控制算法需要进行矩阵分解或矩阵微分等运算,计算复杂,不利于实时应用。针对一类低相干系数的多轴随机振动试验场景,利用牛顿法推导激励谱迭代方程,提出一种驱动谱迭代修正算法,简化了控制计算量,提高控制实时性。对算法收敛性和增益因子进行理论分析,并利用数值仿真在对算法进行验证。最后,利用三轴向振动台与集成该算法的多输入多输出振动控制器进行三轴向振动试验研究,结果表明:基于牛顿迭代法的驱动谱迭代修正算法在多输入多输出随机振动试验对功率谱控制试验中取得了良好的控制精度,满足工程应用需求。

关键词：三轴振动多输入多输出驱动谱迭代修正算法增益因子振动控制

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Recent advances in theoretical studies on transition-metal-catalyzed regioselective C-H functionalization of indoles

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JOURNAL OF MOLECULAR MODELING 2022年第9期28卷 267-267页

作者： Ma, Hongsheng Yu, Tongyan Chi, Longxiao Huang, Cong Li, xuwen Zhang, Rui deng, Chao Nanjing Agr Univ Coll Sci Jiangsu Key Lab Pesticide Sci Nanjing 210095 Peoples R China Nanjing Agr Univ Coll Sci Dept Chem Nanjing 210095 Peoples R China

Indole compounds are widely found in natural products and drug candidates. The transition-metal-catalyzed regioselective C-H bond functionalization of indoles as the most efficient method for the synthesis of various functionalized indoles has been extensively studied in the past two decades due to its advantages of step economy and atom economy. In general, the catalysts included the transition-metals (Pd, Rh, Ru, Cu, Co, Fe, Zn, and Ga) and these reactions were accomplished with a remarkably wide range of coupling reagents for construction of various C-C and C-X (X =N, O, S) bonds. However, the general and important rules of the regioselectivity are not clear to date. Therefore, a comprehensive analysis through previous reported theoretical studies on transition-metal-catalyzed regioselective C-H bond functionalization of indoles was crucial and significant. In this review, we found that when the C-H bond activation process was the rate-determining step, the regioselectivity ordinarily occurred at the C7 or C4 positions (on benzene ring), and otherwise, the regioselectivity often occurred at C2 position (on pyrrole ring). For indoline substrates, the C-H bond functionalization occurred at the benzene ring.

关键词： Indole C-H functionalization Mechanism Regioselectivity Transition-metals

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The first complete mitochondrial genome of the genusDendronereis, represented byD. chipoliniHsueh, 2019 (Annelida, Nereididae) from Beibu Gulf, China

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Mitochondrial DNA Part B 2022年第2期7卷 393-395页

作者： Wenquan Zhen xuwen Wu Erwei Hao Wanru Xu Jiagang deng Junhua Zhu Youhou Xu a Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation College of Marine Sciences Beibu Gulf University Qinzhou China b Laboratory of Marine Organism Taxonomy and Phylogeny Institute of Oceanology Chinese Academy of Sciences Qingdao China c Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica Guangxi University of Chinese Medicine Nanning Chinad Collaborative Innovation Center for Research on Functional Ingredients of Agricultural Residues Guangxi University of Chinese Medicine Nanning China

The genusDendronereisPeters, 1854 is characterized in the polychaete family Nereididae by its feather-shaped branchiae on the anterior segments. In this study, we present the first complete mitogenome ofDendronereis, represented ***,2019, collected from Beibu Gulf, China. The nucleotide composition is biased toward A + T nucleotides, accounting 31.5% for A, 22.3% for C, 14.7% for G and 31.5% for T. The assembled mitogenome is 15,763 bp in length, with a typical set of 13 protein-coding genes (PCGs), 22 transfer RNA (tRNA), 2 ribosomal RNA (rRNA), and 1 non-coding control region. All genes are encoded on H-strand. The control region is 1260 bp in length and located between tRNA-Gly and tRNA-Met. Phylogenetic study showed *** arranged with high support into the clade of Namanereidinae. The complete mitogenome provides important molecular data for investigating the phylogeny and evolution of the nereid animals.

关键词： Dendronereis chipolini mitogenome polychaete

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Fibrin gel-assisted stone extraction in retrograde intrarenal surgery

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BJU INTERNATIONAL 2022年第2期129卷 170-173页

作者： Yu, Yue Xi, Haibo Chen, Yujun Li, xuwen Liu, Wei Hu, Jieping deng, Jun Liu, Xiaoqiang Lin, Longhui Li, Chen Wang, Mengzhen Fu, Bin Wang, Gongxian Kuang, Renrui Zhou, Xiaochen Nanchang Univ Affiliated Hosp 1 Dept Urol Nanchang Jiangxi Peoples R China

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Community structure of benthic macroinvertebrates in native and introduced mangroves of northern Beibu Gulf, China: Implication for restoring mangrove ecosystems

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MARINE POLLUTION BULLETIN 2022年 180卷 113796页

作者： Zhen, Wenquan Kwan, Kit Yue Wang, Chun-Chieh Wu, xuwen Guo, Guo deng, Qiuxiang Huang, Xing Wang, Xueping Zhu, Junhua Xu, Peng Beibu Gulf Univ Coll Marine Sci Beibu Gulf Ocean Dev Res Ctr Guangxi Key Lab Beibu Gulf Marine Biodivers Conse Qinzhou 535011 Peoples R China Guangxi Acad Sci Guangxi Beibu Gulf Marine Res Ctr Guangxi Key Lab Marine Environm Sci Nanning 530007 Peoples R China Chinese Acad Sci Inst Oceanol Qingdao 266071 Peoples R China Guangxi Beihai Coastal Natl Wetland Pk Beihai 536000 Peoples R China

Introduced mangroves are widely used to restore mangrove ecosystems in South China. Results of potential impacts on indicative benthic macroinvertebrates are divergent. We explored the community structure of benthic macroinvertebrates in the mangrove ecosystem of northern Beibu Gulf, China across four habitats: native Avicennia marina mangrove, introduced Laguncularia racemosa mangrove, native-introduced mixed mangrove, and unvegetated intertidal flat. Based on the Hill number, community structure was estimated from the dimensions of estimated species richness, diversity, evenness, and species composition similarity. Benthic macroinvertebrates in the unvegetated flat significantly differed from the other three assemblages in mangroves;introduced L. racemosa mangrove had relatively distinct benthic macroinvertebrate assemblage from the native A. marina and the mixed mangroves, with lower species richness and similarity but higher diversity and evenness. Considering the lack of unanimous conclusion of potential impact on benthic macroinvertebrates under complex species interactions, native mangroves should be of top priority in ecosystem restoration.

关键词： Taxonomic diversity Species composition similarity Hill number Tidal flat Avicennia marina Laguncularia racemosa

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长沙市公共体育服务智慧化的生存境遇及未来发展

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当代体育科技 2021年第30期11卷 144-147页

作者：邓毅李旭雯长沙市南雅中学湖南长沙410129 湖南师范大学体育学院湖南长沙410012

公共体育服务智慧化是公共体育服务的未来创新发展趋势,是带领人民创造更美好的体育体验,提升人民社会获得感的必要手段。为促进长沙市公共体育服务智慧化的快速发展,笔者通过对长沙市公共体育服务智慧化的兴起原因和时代价值进行了分析... 详细信息

公共体育服务智慧化是公共体育服务的未来创新发展趋势,是带领人民创造更美好的体育体验,提升人民社会获得感的必要手段。为促进长沙市公共体育服务智慧化的快速发展,笔者通过对长沙市公共体育服务智慧化的兴起原因和时代价值进行了分析,并提出相应策略,主要包括提升政府公共体育服务质量、构建公共体育服务智慧化平台、加快建设智慧化体育场地设施、培育“智慧型”体育专业人才队伍、促进公共体育服务供给主体多元化、增加体育专项资金的投入等。

关键词：公共体育服务智慧体育互联网+ 社区体育

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少阿片药或成为今后镇静/镇痛与麻醉创新的重要引领

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中华疼痛学杂志 2022年第2期18卷 177-179页

作者：夏涵钱旭雯邓硕曾北京中医药大学东方医院麻醉科北京100078

镇静/镇痛是麻醉的两大基石,镇痛是硬道理。镇痛离不开阿片类药,但阿片类药是把"双刃剑",除镇痛作用外,阿片类药会产生许多不良反应,诱发痛觉过敏和促进癌症转移。因此,创新少阿片的镇静/镇痛可能是今后麻醉发展的方向。

关键词：镇痛药阿片类镇静/镇痛环泊酚艾司氯胺酮

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Experimental Study on Noncoaxial Characteristics of Saturated Remolded Loess

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ADVANCES IN CIVIL ENGINEERING 2020年第1期2020卷

作者： Jiang, Xuemeng Niu, Haoshuang Huang, Wenpeng Shang, xuwen Wang, deng Changan Univ Key Lab Special Area Highway Engn Minist Educ Xian 710064 Peoples R China

In practical engineering, if the influence of noncoaxial stress and strain is not considered, part of soil deformation will be ignored, resulting in the structural design which is not safe enough. A series of undrained tests was performed on remolded loess specimens using a hollow cylinder apparatus to examine the coupling between principal stress magnitude and direction in these specimens. First, the elastic parameters of remolded loess were obtained, and these parameters were used as the basis for investigating the noncoaxiality of the soil body under principal stress axis rotation (PSAR). The effects of elastic strain, intermediate principal stress coefficient, and magnitude of the deviatoric stress on the noncoaxiality of remolded loess were also investigated. The results of these experiments show that remolded loess exhibits significant noncoaxial behavior during PSAR. The noncoaxiality angle of remolded loess cyclically fluctuates with increases in the principal stress angle. It was also observed that the noncoaxiality angle will be overestimated if the effects of elastic strain are overlooked. Reversals in the direction of PSAR cause dramatic changes in the noncoaxiality angle. Increases in the intermediate principal stress coefficient are accompanied by increases in the noncoaxiality angle, up to a certain degree;however, these changes do not affect the development of the noncoaxiality angle. In coupled rotational tests with a range of deviatoric stress amplitudes, it was observed that changes in the deviatoric stress amplitude will affect the development of the noncoaxiality angle;increases in the deviatoric stress amplitude cause the noncoaxiality angle versus principle stress angle plot to shift to the left gradually, thus accelerating the trends of the noncoaxiality angle. Increases in the cycle number also increase the noncoaxiality of remolded loess.

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