检索结果-南通市图书馆

Fundamental Understanding of Hydrogen Evolution Reaction on Zinc Anode Surface:A First‑Principles Study

Nano-Micro Letters 2024年第6期16卷 180-191页

作者： Xiaoyu Liu yiming guo Fanghua Ning Yuyu Liu Siqi Shi Qian Li Jiujun Zhang Shigang Lu Jin Yi Institute for Sustainable Energy&Department of Chemistry Shanghai UniversityShanghai 200444People’s Republic of China School of Materials Science and Engineering Shanghai UniversityShanghai 200444People’s Republic of China College of Materials Science and Engineering National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400044People’s Republic of China

Hydrogen evolution reaction(HER)has become a key factor affecting the cycling stability of aqueous Zn-ion batteries,while the corresponding fundamental issues involving HER are still unclear.Herein,the reaction mechanisms of HER on various crystalline surfaces have been investigated by first-principle calculations based on density functional theory.It is found that the Volmer step is the ratelimiting step of HER on the Zn(002)and(100)surfaces,while,the reaction rates of HER on the Zn(101),(102)and(103)surfaces are determined by the Tafel step.Moreover,the correlation between HER activity and the generalized coordination number(CN)of Zn at the surfaces has been revealed.The relatively weaker HER activity on Zn(002)surface can be attributed to the higher CN of surface Zn atom.The atomically uneven Zn(002)surface shows significantly higher HER activity than the flat Zn(002)surface as the CN of the surface Zn atom is lowered.The CN of surface Zn atom is proposed as a key descriptor of HER activity.Tuning the CN of surface Zn atom would be a vital strategy to inhibit HER on the Zn anode surface based on the presented theoretical studies.Furthermore,this work provides a theoretical basis for the in-depth understanding of HER on the Zn surface.

关键词： Aqueous Zn-ion battery Zn anode Hydrogen evolution reaction Coordination number First-principles calculation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A novel minority sample fault diagnosis method based on multisource data enhancement

引用

International Journal of Mechanical System Dynamics 2024年第1期4卷 88-98页

作者： yiming guo Shida Song Jing Huang School of Mechanical Engineering Nanjing University of Science and TechnologyNanjingChina School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjingChina

Effective fault diagnosis has a crucial impact on the safety and cost of complex manufacturing systems.However,the complex structure of the collected multisource data and scarcity of fault samples make it difficult to accurately identify multiple fault conditions.To address this challenge,this paper proposes a novel deep-learning model for multisource data augmentation and small sample fault diagnosis.The raw multisource data are first converted into two-dimensional images using the Gramian Angular Field,and a generator is built to transform random noise into images through transposed convolution operations.Then,two discriminators are constructed to evaluate the authenticity of input images and the fault diagnosis ability.The Vision Transformer network is built to diagnose faults and obtain the classification error for the discriminator.Furthermore,a global optimization strategy is designed to upgrade parameters in the model.The discriminators and generator compete with each other until Nash equilibrium is achieved.A real-world multistep forging machine is adopted to compare and validate the performance of different methods.The experimental results indicate that the proposed method has multisource data augmentation and minority sample fault diagnosis capabilities.Compared with other state-of-the-art models,the proposed approach has better fault diagnosis accuracy in various scenarios.

关键词： multisource data augmentation minority sample fault diagnosis complex manufacturing system global optimization Vision Transformer

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Factor graph based navigation and positioning for control system design:A review

引用

Chinese Journal of Aeronautics 2022年第5期35卷 25-39页

作者： Xiwei WU Bing XIAO Cihang WU yiming guo Lingwei LI School of Automation Northwestern Polytechnical UniversityXi’an 710072China

Navigation and positioning is an important and challenging problem in many control engineering applications.It provides feedback information to design controllers for systems.In this paper,a bibliographical review on factor graph based navigation and positioning is presented.More specifically,the sensor modeling,the factor graph optimization methods,and the topology factor based cooperative localization are reviewed.The navigation and positioning methods via factor graph are considered and classified.Focuses in the current research of factor graph based navigation and positioning are also discussed with emphasis on its practical application.The limitations of the existing methods,some solutions for future techniques,and recommendations are finally given.

关键词： Factor graph Navigation Optimization methods Positioning Sensor modeling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Adaptive vector field based accurate homing control of aerial delivery systems

引用

Chinese Journal of Aeronautics 2023年第2期36卷 256-269页

作者： yiming guo Jianguo YAN Cihang WU Xiwei WU Bing XIAO School of Automation Northwestern Polytechnical UniversityXi'an 710072China

This paper investigates the homing control problem of a flexible aerial delivery system with external wind,at-mospheric turbulence,and aerodynamic uncertainties.An accurate homing control strategy is presented,consisting of a trajectory generation algorithm and a lateral tracking controller.A high-altitude trajectory generation is de-veloped with system characteristics explicitly considered to generate the desired trajectory for the aerial delivery control system design.It significantly compensates for the altitude deviation of the existing multiphase theory based trajectory generation methodologies.A novel adaptive vector field control law is then designed to accomplish the lateral tracking maneuvers.The key feature of the proposed method is that the complete lateral closed-loop control,including position and heading angle loops,is achieved in the presence of disturbances and dynamic uncertainties.The homing control with high landing accuracy is therefore achieved.Simulation and hardware-in-loop testing results are finally presented to validate the proposed method’s effectiveness compared to a conventional homing control scheme.

关键词： Asymptotic stability Adaptive control Aerial delivery system Parafoil system Tracking control

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Centroidal Voronoi Tessellation and Model Predictive Control–Based Macro-Micro Trajectory Optimization of Microsatellite Swarm

引用

Space(Science & Technology) 2022年第1期2022卷 166-175页

作者： Xiwei Wu Bing Xiao Cihang Wu yiming guo School of Automation Northwestern Polytechnical UniversityXi’anChina

Probabilistic swarm guidance enables autonomous microsatellites to generate their individual trajectories independently so that the entire swarm converges to the desired distribution shape.However,it is essential to avoid crowding for reducing the possibility of collisions between microsatellites.To determine the collision-free guidance trajectory of each microsatellite from the current position to the target space,a collision avoidance algorithm is necessary.A synthesis method is proposed that generate the collision avoidance trajectories.The idea is that the trajectory planning is divided into macro-planning and microplanning;macro-planning guides where the microsatellites move step by step from the initial cube to the target cube by probabilistic swarm guidance with Centroidal Voronoi tessellation,while the micro-planning is to generate the optimal path for each step and finally reach the specified position in the target cube by model predictive control.Simulation results are presented for the collision-free guidance trajectory of microsatellites to verify the benefits of this planning scheme.

关键词： collision specified finally

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A gap-free reference genome reveals structural variations associated with flowering time in rapeseed(Brassica napus)

引用

Horticulture Research 2023年第10期10卷 37-49页

作者： Bao Li Qian Yang Lulu Yang Xing Zhou Lichao Deng Liang Qu Dengli guo Rongkui Hui yiming guo Xinhong Liu Tonghua Wang Lianyi Fan Mei Li Mingli Yan Crop Research Institute Hunan Academy of Agricultural SciencesChangshaHunan 410125China Hunan Hybrid Rapeseed Engineering and Technology Research Center ChangshaHunan 410125China Department of Cell Biology and Genetics Wuhan Benagen Tech Solutions Company LimitedWuhanHubei 430021China

Allopolyploid oilseed rape(Brassica napus)is an important oil crop and vegetable.However,the latest version of its reference genome,with collapsed duplications,gaps,and other issues,prevents comprehensive genomic analysis.Herein,we report a gap-free assembly of the rapeseed cv.Xiang5A genome using a combination of ONT(Oxford Nanopore Technologies)ultra-long reads,PacBio high-fidelity reads,and Hi-C datasets.It includes gap-free assemblies of all 19 chromosomes and telomere-to-telomere assemblies of eight chromosomes.Compared with previously published genomes of B.napus,our gap-free genome,with a contig N50 length of 50.70 Mb,has complete assemblies of 9 of 19 chromosomes without manual intervention,and greatly improves contiguity and completeness,thereby representing the highest quality genome assembly to date.Our results revealed that B.napus Xiang5A underwent nearly complete triplication and allotetraploidy relative to Arabidopsis thaliana.Using the gap-free assembly,we found that 917 flowering-related genes were affected by structural variation,including BnaA03.VERNALIZATION INSENSITIVE 3 and BnaC04.HIGH EXPRESSION OF OSMOTICALLY RESPONSIVE GENES 1.These genes may play crucial roles in regulating flowering time and facilitating the adaptation of Xiang5A in the Yangtze River Basin of China.This reference genome provides a valuable genetic resource for rapeseed functional genomic studies and breeding.

关键词： structural free thereby

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Distinct effects of copper on the degradation of β-lactam antibiotics in fulvic acid solutions during light and dark cycle

引用

Environmental Science and Ecotechnology 2020年第3期3卷 41-49页

作者： Xinran Zhang yiming guo Yanheng Pan Xin Yang School of Environmental Science and Engineering Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation TechnologySun Yat-sen UniversityGuangzhou510275China

This study revealed the dual roles of Cu(Ⅱ)on the β-lactam antibiotics degradation in Suwannee River fulvic acid(SRFA)solution during day and night cycle.Amoxicillin(AMX)and ampicillin(AMP)were selected as the representative β-lactam antibiotics.Cu(Ⅱ)played a key role in the dark degradation of AMX and AMP via catalytic hydrolysis and oxidation.However,Cu(Ⅱ)mainly exhibited an inhibitory effect on SRFA-involved photochemical degradation of AMX and AMP.In the presence of 500 nM of Cu(Ⅱ),the degradation rate of AMX and AMP in the light condition were around 5 times higher than that in the dark condition,suggesting the photodegradation of β-lactam antibiotics was much more pronounced than catalyzed hydrolysis and oxidation.The triplet excited state of SRFA(^(3)SRFA*)primarily contributed to AMX and AMP photodegradation.Hydroxyl radicals(·OH)and singlet oxygen(^(1)O_(2))exhibited limit impacts.The redox cycle of Cu(Ⅱ)/Cu(Ⅰ)restricted the electron transfer pathway of ^(3)SRFA* with AMX and AMP.During the day and night cycles for 48 h,Cu(Ⅱ)served as a stronger inhibitor rather than a promotor.These findings highlight the interactions between Cu(Ⅱ)and SRFA are distinct under day and night conditions,which could further affect the fate of β-lactam antibiotics in natural environments.

关键词： Amoxicillin(AMX) Ampicillin(AMP) Copper(Cu(Ⅱ)) Fulvic acid Day and night cycle

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

分行业信息披露与企业创新——来自行业信息披露指引的准自然实验

引用

财贸经济 2024年第4期45卷 105-122页

作者：罗宏吴丹郭一铭西南财经大学会计学院 611130 成都信息工程大学管理学院 611130

创新是引领高质量发展、提高企业竞争力的关键。信息披露制度的完善是资本市场基础设施建设的主要内容,对创新发展具有重要意义。2015年沪深交易所分批次实施的行业信息披露制度为观察信息披露制度建设对微观企业的影响和作用机制提供... 详细信息

创新是引领高质量发展、提高企业竞争力的关键。信息披露制度的完善是资本市场基础设施建设的主要内容,对创新发展具有重要意义。2015年沪深交易所分批次实施的行业信息披露制度为观察信息披露制度建设对微观企业的影响和作用机制提供了极好的研究机会。本文以2012—2020年中国A股上市公司为研究样本,构建多时点双重差分模型,探讨分行业信息披露对企业创新的影响及其作用机制。研究结果表明,分行业信息披露政策的实施对企业专利申请总量没有显著影响,但区分专利类别后发现,表征企业创新质量的高质量专利申请显著增加,说明分行业信息披露促进了有价值的创新,提升了企业创新水平,且这一结论在经过一系列稳健性检验之后依然成立。作用机制分析表明,分行业信息披露通过增大机构投资者治理压力、行业竞争压力以及提高分析师关注度促进企业创新。异质性分析表明,对于信息敏感性和创新性更高的行业,分行业信息披露对企业创新的提升作用更显著。本文从分行业信息披露的视角探讨了企业创新的驱动因素,对我国持续完善信息披露制度建设、推动资本市场更好地服务实体经济高质量发展具有参考意义。

关键词：分行业信息披露企业创新信息环境准自然实验

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

分行业信息披露与分析师预测——基于行业信息披露指引发布的证据

引用

财贸研究 2024年第2期35卷 97-110页

作者：罗宏吴丹郭一铭西南财经大学四川成都611130

利用沪深交易所分批次发布的行业信息披露指引作为准实验场景,考察分行业信息披露对分析师预测的影响。研究发现:分行业信息披露显著提高了分析师盈余预测准确度,降低了乐观度与分歧度,且该结论在经过异质性处理效应检验、平衡趋势检验... 详细信息

利用沪深交易所分批次发布的行业信息披露指引作为准实验场景,考察分行业信息披露对分析师预测的影响。研究发现:分行业信息披露显著提高了分析师盈余预测准确度,降低了乐观度与分歧度,且该结论在经过异质性处理效应检验、平衡趋势检验、安慰剂检验、更换核心变量测量方法等一系列稳健性测试后仍然成立。作用机制检验结果表明,行业信息可比性是分行业信息披露影响分析师预测的主要渠道。异质性分析显示,当行业信息敏感性较高、分析师行业专长水平较低、分析师信息获取成本和处理成本较高时,分行业信息披露对分析师预测的积极影响更明显。进一步研究表明,分行业信息披露显著增加了分析师可以获得的公共信息。

关键词：分行业信息披露分析师预测信息环境准自然实验

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A restoration-promoting integrated floating bed and its experimental performance in eutrophication remediation

引用

Journal of Environmental Sciences 2014年第5期26卷 1090-1098页

作者： yiming guo Yunguo Liu Guangming Zeng Xinjiang Hu Xin Li Dawei Huang Yunqin Liu Yicheng Yin College of Environmental Science and Engineering Hunan University Key Laboratory of Environmental Biology and Pollution Control (Hunan University) Ministry of Education

Numerous studies on eutrophication remediation have mainly focused on purifying water first, then restoring submerged macrophytes. A restoration-promoting integrated floating bed （RPIFB） was designed to combine the processes of water purification and macrophyte restoration simultaneously. Two outdoor experiments were conducted to evaluate the ecological functions of the RP1FB. Trial 1 was conducted to compare the eutrophication purification among floating bed, gradual-submerging bed （GSB） and RPIFB technologies. The results illustrated that RPIFB has the best purification capacity. Removal efficiencies of RPIFB for TN, TP,NH4＋-N, NO3-N, CODcr, Chlorophyll-a and turbidity were 74.45%, 98.31%, 74.71%, 88.81%, 71.42%, 90.17% and 85%, respectively. In trial 2, influences of depth of GSB and photic area in RPIFB on biota were investigated. When the depth of GSB decreased and the photic area of RPIFB grew, the height of Potamogeton crispus Linn. increased, but the biomass of Canna indica Linn. was reduced. The mortalities of Misgurnus anguillicaudatus and Bellamya aeruginosa in each group were all less than 7%. All results indicated that when the RPIFB was embedded into the eutrophic water, the regime shift from phytoplankton-dominated to macrophyte-dominated state could be promoted. Thus, the RPIFB is a promising remediation technology for eutrophication and submerged macrophyte restoration.

关键词： submerged macrophyte restoration eutrophication floating bed regime shift

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：