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Regulating the intrinsic electronic structure of carbon nanofibers with high-spin state Ni for sodium storage with high-power density

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Journal of Materials Science & Technology 2024年第4期171卷 16-23页

作者： Zhijia zhang Gang Xie Yuefang Chen Yanhao Wei mengmeng zhang Shulei Chou Yunxiao Wang Yifang zhang Yong Jiang School of Materials Science and Engineering Institute of Quantum Materials and DevicesState Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China Institute for Superconducting and Electronic Materials University of WollongongWollongongNSW 2522Australia

Carbon nanofibers(CNFs)with high specific surface area show great potential for sodium storage as a hard carbon ***,CNFs anchored with Ni nanoparticles(CNFs/Ni)were prepared through chemical vapor deposition and impregnation reduction methods,in situ growing on the three-dimensional porous copper current collector(3DP-Cu).The coupling effect of high-spin state Ni nanopar-ticles leads to the increase of defect density and the expansion of lattice spacing of ***,the 3DP-Cu ensures a high loading capacity of CNFs and short ion/electron transport *** an integral binder-free anode,the 3DP-Cu/CNFs/Ni exhibits excellent electrochemical performance,which demon-strates a high specific capacity with 298.5 mAh g^(-1)at 1000 mA g^(-1)after 1500 cycles,and a high power density with 200 mAh g^(-1)over 1000 cycles at 5000 mA g^(-1).Density functional theory calculation re-sults show that the high-spin state Ni regulates the electronic structure of CNFs,which significantly reduces the adsorption energy for Na^(+)(-2.7 Ev)and thus enables high-rate *** regulation of the electronic structure of carbon materials by high-spin state metal provides a new strategy for developing high-power carbonaceous anode materials for sodium-ion batteries.

关键词： Carbon nanofibers Ni nanoparticles High-spin state Sodium-ion batteries Anode materials Density functional theory calculation

Epitaxial growth of Cu_(2-x)Se on Cu(220)crystal plane as high property anode for sodium storage

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Chinese Chemical Letters 2024年第7期35卷 519-523页

作者： Zhijia zhang Shihao Sun Yuefang Chen Yanhao Wei mengmeng zhang Chunsheng Li Yan Sun Shaofei zhang Yong Jiang School of Materials Science and Engineering Institute of Quantum Materials and DevicesState Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China School of Chemistry and Life Sciences Suzhou University of Science and TechnologySuzhou 215009China Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China Suzhou University of Science and TechnologySuzhou 215009China Hebei Key Laboratory of Flexible Functional Materials/Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang 050018China

Three-dimentional(3D)transition metal selenides with sufficient channels could produce significant superiority on enhancing reaction kinetics for sodium-ion ***,the thorough exploration of 3D architecture with a facile strategy is still *** we report that a polycrystalline Cu_(2-x)Se film was epitaxial grown on(220)facets-exposed Cu by direct selenization of a nanoporous Cu skeleton,which is obtained by dealloying rolled Cu Mn@Cu alloy *** functional theory calculation result shows strong adsorption energy for Se atoms on Cu(220)planes during selenization reaction,rendering a low energy *** virtue of this core-shell 3D nanoporous architecture to offer abundant active sites and endow fast electron/ion transportation,the nanoporous Cu_(2-x)Se@Cu-0.15 composite electrode exhibits remarkable sodium-ion storage properties with high reversible capacity of 950.6μAh/cm^(2)at 50μA/cm^(2),suprior rate capability of 457.6μAh/cm^(2)at 500μA/cm^(2),as well as an ultra-long stability at a high current *** investigation reveals that the electrochemical reaction is a typical conversion-type reaction with different *** novel electrode synthetic strategy provides useful instructions to design the high-performance anode material for sodium-ion batteries.

关键词： Cu_(2)se 3D architecture Anode materials Density functional theory calculation Sodium-ion battery

Dammarane-type triterpenoids from Gynostemma longipes and their protective activities on hypoxia-induced injury in PC12 cells

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Chinese Journal of Natural Medicines 2024年第5期22卷 466-480页

作者： LIANG Haizhen CHEN Xiaojuan LI Qi zhang mengmeng LU Pengxin zhang Jie SONG Juan zhang Tao GUO Baolin MA Baiping Department of Pharmaceutical Sciences Beijing Institute of Radiation MedicineBeijing 100850China Institute of Medicinal Plant Development Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100193China AnKang Chia Tai Pharmaceutical Co. Ltd.Shaanxi 725000China

Sixteen new dammarane-type triterpenoid saponins(1-16)featuring diverse structural variations in the side chain at C-17,along with twenty-one known analogues(17-37),have been isolated from the rhizomes of Gynostemma longipes ***,a plant renowned for its medicinal and edible *** structural elucidation of these compounds was accomplished through comprehensive analyses of 1D and 2D NMR and HRMS spectroscopic data,supplemented by comparison with previously reported *** assays on the isolates for their protective effects against hypoxia-induced damage in pheochromocytoma cells(PC12 cells)revealed that nine saponins exhibited significant anti-hypoxic *** investigation into the anti-hypoxia mechanisms of the representative saponins demonstrated that compounds 22 and 36 markedly reduced the levels of hypoxia-induced ***,these compounds were found to decrease the release of lactate dehydrogenase(LDH)and malondialdehyde(MDA),while increasing the activity of superoxide dismutase(SOD),thereby indicating that the saponins could mitigate hypoxia-induced injuries by ameliorating apoptosis and oxidative *** findings offer substantial evidence for the future utilization and development of ***,identifying dammarane-type triterpenoid saponins as its active anti-hypoxic constituents.

关键词： Gynostemma longipes Dammarane-type saponins Anti-hypoxia effect Apoptosis

Surface Topological Glycosylation-Mediated Mucoadhesion of Bacteria

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Chinese Journal of Chemistry 2024年第13期42卷 1447-1455页

作者： Xiao Kuang Xiaobing Liu Ju Chen Wenyan Lv mengmeng zhang Huan Chen Feng Wu Jinyao Liu School of Life Sciences Shanghai UniversityShanghai 200444China Shanghai Key Laboratory for Nucleic Acid Chemistry and Nanomedicine Institute of Molecular MedicineState Key Laboratory of Systems Medicine for CancerRenji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghai 200127China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules and National Center for Translational MedicineShanghai Jiao Tong UniversityShanghai 200240China College of Chemistry and Materials Science Shanghai Normal UniversityShanghai 200234China

Sugar moieties present on bacterial surface serve as pivotal regulators of bacterial *** adjusting the abundance and distribution of surface sugar moieties can offer an important approach to manipulating bacterial behavior,but has been proven to be ***,surface topological glycosylation is reported to mediate the interaction of bacteria with mucous *** functionalized by sugar moieties with different branching are synthesized through iterative Michael addition and amide condensation *** a copper-catalyzed azide-alkyne cycloaddition,the resulting compounds with different branching structures can be attached onto bacterial surface that is modified with azido *** a proof-of-concept study,a set of topologically glycosylated probiotics(TGPs)is prepared using linear,two-branched,and tetra-branched compounds,*** interaction between mucin and TGPs was studied and the results demonstrate that,compared to unmodified bacteria,TGPs exhibit an enhanced adhesive capacity to mucin,which increases with the branching *** binding trend is observed in ex vivo colonic mucus adhesion experiments and bacteria glycosylated with tetra-branched compounds display the highest binding *** work proposes a chemical method to tune the abundance and distribution of sugar moieties on bacteria,providing unique significant insights into the manipulation of bacterial behavior through surface modification.

关键词： Topochemistry Bacteria Glycosylation Surface modification Mucoadhesion Click chemistry

Modulating the p-band center of carbon nanofibers derived from Co spin state as anode for high-power sodium storage

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Chinese Chemical Letters 2024年第1期35卷 537-541页

作者： Zhijia zhang Yuwen Zhao Yanhao Wei mengmeng zhang Chunsheng Li Yan Sun Jianmin Ma Yong Jiang School of Materials Science and Engineering State Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China School of Chemistry and Life Sciences Suzhou University of Science and TechnologySuzhou 215009China Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and Chemical Industry of China Suzhou University of Science and TechnologySuzhou 215009China School of Chemistry Tiangong UniversityTianjin 300387China School of Electronic and Information Engineering Institute of Quantum Materials and DevicesTiangong UniversityTianjin 300387China

Carbon nanofibers(CNFs)have received extensive and in-depth studied as anodes for sodium-ion batteries(SIBs),and yet their initial Coulombic efficiency and rate capability remain enormous challenge at practical ***,CNFs anchored with cobalt nanocluster(CNFs-Co)were prepared using chemical vapor deposition and thermal reduction *** as-prepared CNFs-Co shows a high initial Coulombic efficiency of 91%and a high specific discharge capacity of 246 mAh/g at 0.1 A/g after 200 cycles as anode for ***,the CNFs-Co anode still delivers a high cycling stability with 108 mAh/g after 1000 cycles at 10 A/*** excellent electrochemical properties could be attributed to the involved spin state Co,which endows CNFs with large interplanar spacing(0.39 nm)and abundant vacancy ***,the spin state Co downshifts the p-band center of carbon and strengthens the Na+adsorption energy from-2.33 eV to-2.64 eV based on density functional theory *** novel strategy of modulating the carbon electronic structure by the spin state of magnetic metals provides a reference for the development of high-performance carbon-based anode materials.

关键词： Carbon nanofibers Chemical vapor deposition Spin state p-band center Sodium-ion battery

A Novel Agricultural Data Sharing Mode Based on Rice Disease Identification

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Plant Diseases and Pests 2024年第2期15卷 9-16页

作者： mengmeng zhang Xiujuan WANG Mengzhen KANG Jing HUA Haoyu WANG Feiyue WANG State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of SciencesBeijing100190China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100049China Beijing Engineering Research Center of Intelligent Systems and Technology Institute of AutomationChinese Academy of SciencesBeijing 100190China Faculty of Innovation Engineering Macao University of Science and TechnologyMacao 999078China State Key Laboratory for Management and Control of Complex System Institute of AutomationChinese Academy of SciencesBeijing 100190China

In this paper,a variety of classical convolutional neural networks are trained on two different datasets using transfer learning *** demonstrated that the training dataset has a significant impact on the training results,in addition to the optimization achieved through the model ***,the lack of open-source agricultural data,combined with the absence of a comprehensive open-source data sharing platform,remains a substantial *** issue is closely related to the difficulty and high cost of obtaining high-quality agricultural data,the low level of education of most employees,underdeveloped distributed training systems and unsecured data *** address these challenges,this paper proposes a novel idea of constructing an agricultural data sharing platform based on a federated learning(FL)framework,aiming to overcome the deficiency of high-quality data in agricultural field training.

关键词： Rice disease and pest identification Convolutional neural networks Distributed training Federated learning(FL) Open-source data sharing platform

商业模式创新对新创企业组织韧性的影响机制研究

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科技进步与对策 2024年第9期41卷 108-118页

作者：王维张萌萌郭韬齐齐哈尔大学经济与管理学院齐齐哈尔大学企业创新发展研究中心黑龙江齐齐哈尔161006 哈尔滨工程大学经济管理学院哈尔滨工程大学黑龙江区域创新驱动发展研究中心黑龙江哈尔滨150001

创新赋能组织韧性是企业应对环境不确定性的时代要求,新创企业组织韧性对其生存发展与产业链安全具有重要作用。区分我国A股上市新创企业新颖型和效率型商业模式创新,探讨两种创新类型与新创企业组织韧性的作用关系以及技术创新的调节... 详细信息

创新赋能组织韧性是企业应对环境不确定性的时代要求,新创企业组织韧性对其生存发展与产业链安全具有重要作用。区分我国A股上市新创企业新颖型和效率型商业模式创新,探讨两种创新类型与新创企业组织韧性的作用关系以及技术创新的调节效应。研究发现:①新颖型商业模式创新对新创企业组织韧性具有非线性影响,两者之间呈现先抑后扬的U型关系,效率型商业模式创新能够显著提高新创企业组织韧性;②技术创新能够强化商业模式创新与新创企业组织韧性的作用关系;③企业融资约束水平未改变效率型商业模式创新对新创企业组织韧性的作用机制,但当融资约束较高时,新颖型商业模式创新对新创企业组织韧性的U型影响消失,技术创新负向调节新颖型商业模式创新对新创企业组织韧性的抑制作用。研究结论可从商业模式创新类型视角为新创企业培育组织韧性提供重要启示。

关键词：新创企业组织韧性新颖型商业模式创新效率型商业模式创新技术创新

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复合磷酸盐螯合剂对超高压处理的骆驼乳品质的影响

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食品与发酵工业 2024年第1期50卷 141-147页

作者：张萌萌赵静雅双全内蒙古农业大学食品科学与工程学院内蒙古呼和浩特010018

骆驼乳有较高的营养价值及保健功效,但超高压灭菌过程中经常出现凝乳现象,因而常加入磷酸盐螯合剂提高骆驼乳的稳定性。该研究以探究超高压处理的骆驼乳品质的影响为目的,以超高压处理后的骆驼乳为研究对象,对不同磷酸盐螯合剂的种类、... 详细信息

骆驼乳有较高的营养价值及保健功效,但超高压灭菌过程中经常出现凝乳现象,因而常加入磷酸盐螯合剂提高骆驼乳的稳定性。该研究以探究超高压处理的骆驼乳品质的影响为目的,以超高压处理后的骆驼乳为研究对象,对不同磷酸盐螯合剂的种类、比例进行感官评定,优化加入磷酸盐螯合剂后超高压处理的工艺,分析加入复合磷酸盐螯合剂的超高压处理骆驼乳的理化指标、流变学特性、感官风味等品质特性产生的影响。结果表明,加入0.07%焦磷酸钠和0.1%(均为质量分数)六偏磷酸钠组成的复合磷酸盐螯合剂的骆驼乳,经550 MPa、22 min超高压处理后,其酸度值降低,pH值升高,流变学特性良好,酸味、苦味和涩味值减弱,且对氮氧化合物、醛酮类及芳香族化合物敏感。综上所述,加入复合磷酸盐螯合剂可改善超高压处理的骆驼乳的品质。该研究为综合利用骆驼乳以及骆驼乳的产业化提供试验基础和理论依据。

关键词：骆驼乳超高压处理磷酸盐螯合剂感官品质

中欧班列城市间平台公司的价格与服务竞合博弈研究

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商业经济研究 2024年第6期 147-151页

作者：张蒙蒙许茂增重庆交通大学经济与管理学院重庆400074

本文针对中欧平台公司的“低价竞争”及服务竞争日益激烈导致发展受阻的问题,构建了中欧班列市场结构及竞争关系模型,在此基础上,进一步构建了双重竞争并存情况下平台公司完全竞争、价格合作、服务合作和价格-服务合作等不同情形下的博... 详细信息

本文针对中欧平台公司的“低价竞争”及服务竞争日益激烈导致发展受阻的问题,构建了中欧班列市场结构及竞争关系模型,在此基础上,进一步构建了双重竞争并存情况下平台公司完全竞争、价格合作、服务合作和价格-服务合作等不同情形下的博弈模型,研究平台公司的价格、服务决策。通过数值分析讨论模型参数对决策结果的影响,由此讨论平台公司的策略选择。

关键词：价格竞争服务竞争铁路运输中欧班列