检索结果-内蒙古大学图书馆

Bimetallic Ni-Co MOF@PAN modified electrospun separator enhances high-performance lithium-sulfur batteries

Journal of Energy Chemistry 2023年第7期82卷 484-496,I0010页

作者： Xiaolong Leng Jie Zeng Mingdai Yang Changping Li S.V.Prabhakar Vattikuti Jielin Chen Shuang Li Jaesool Shim Tong Guo Tae Jo Ko School of Mechanical Engineering Yeungnam UniversityGyeongsangbuk-do 38541Republic of Korea College of Mechanical and Electrical Engineering Hunan University of Science and TechnologyXiangtan 411201HunanChina Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education Nanjing University of Science and TechnologyNanjing 210094JiangsuChina

Lithium-sulfur(Li-S)batteries with high energy density are considered promising energy storage devices for the next ***,the shuttle effect and the passive layer between the separator and the electrodes still seriously affect the cycle stability and ***,a bimetallic Ni-Co metal-organic framework(MOF)with adsorption and catalytic synergism for polysulfides was successfully synthesized as an electrospinning separator sandwich for Li-S *** porous Ni-Co MOF coatings into the separator provides more adsorption catalytic sites for polysulfides,prevents their diffusion to the anode,and enhances sulfur ***,the improved Li-S batteries with a Ni-Co MOF@PAN(NCMP)electrospun separator delivered excellent rate performance and outstanding cycle stability,yielding an ultra-high initial capacity of 1560 mA h g^(-1)at 0.1 ***,remarkable Li-S battery performance with a discharge capacity of 794 mA h g^(-1)(84.1%capacity retention)was obtained after500 cycles,while delivering a low capacity decay rate of 0.032%during long-term cycling(up to 500cycles)at 1 ***,even at the current density of 2 C,the capacity attenuation rate of 2000 cycles is only 0.034%per *** addition,compared with the Celgard separator,the NCMP separator also had high thermal stability(keeping the separator outline at 200℃)that ensured battery safety and excellent electrolyte wettability(73%porosity and 535%electrolyte absorption)and significantly enhanced the ionic conductivity and Li^(+) transfer number,and protected the surface integrity of the anode.

关键词： Li-S batteries Ni-Co MOF Adsorption catalysis Synergistic effect

来源：评论

学校读者我要写书评

暂无评论

Two-dimensional metallic CoTe_(2)flakes for electrocatalytic hydrogen evolution

引用

Rare Metals 2024年第11期43卷 5860-5867页

作者： Yu-Qing Zhao Qian Liu Bo-Jian Zhou Guang Yang Shao-Long Jiang School of Physics and Electronics Science Hunan University of Science and TechnologyXiangtan 411201China College of Metallurgy and Energy North China University of Science and TechnologyTangshan 063210China Department of Physics Southern University of Science and TechnologyShenzhen 518055China School of Integrated Circuit Science and Engineering Beihang UniversityBeijing 100191China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong) Shenzhen 518045China

Two-dimensional(2D)metallic 1T-CoTe_(2)has attracted considerable attention due to its fascinating physical properties and promising applications in electronics and ***,the production of highquality 2D 1T-CoTe_(2)still remains ***,we demonstrate a methodology to realize the facile synthesis of ultrathin,high-quality CoTe_(2)flakes with a thickness down to 2.3 nm on mica substrates by an ambient-pressure chemical vapor deposition(CVD)*** atomic arrangement is verified by scanning transmission electron *** theoretical calculations uncover the metallic characteristic of 1T-CoTe_(2)in the 2D ***,the CVD-derived 2D metallic CoTe_(2)flakes for the hydrogen evolution reaction(HER)catalyst exhibit admirable performance,such as an overpotential of186 mV at 10 mA·cm^(-2),a Tafel slope of 78 mV·dec^(-1),an exchange current density of 69μA·cm^(-2),and negligible performance degradation after 1000 *** results establish novel approaches for the synthesis and HER application of 2D metallic 1T-CoTe_(2).

关键词： 2D metallic material 1T-CoTe_(2) Chemical vapor deposition Electrochemical hydrogen evolution

来源：评论

学校读者我要写书评

暂无评论

Prediction of Full-stroke Positioning Accuracy of Precise Linear Stage for Ball Screw Pair 2

Prediction of Full-stroke Positioning Accuracy of Precise Li...

引用

2nd International Conference on Advanced Sensing, Intelligent Manufacturing, ASIM 2023

作者： Tang, Mianzhi Hunan University of Science and Technology College of Mechanical Engineering Xiangtan China

ISBN: (纸本)9798350385571

Positioning accuracy is a key indicator for measuring the motion accuracy of precise linear stage (PLS). This paper analyzes the error sources of high-precision PLS for ball screw pairs, reveals the transmission law of positioning accuracy, and proposes a method for predicting the full-stroke positioning error of PLS with ball screw pairs as the main research object, covering macro (10mm), small (1mm), and micro (0.1mm) stroke scales. The experimental results show that the model can predict the positioning error well. © 2023 IEEE.

关键词： Ball screws

来源：评论

学校读者我要写书评

暂无评论

Research on Bidirectional DC-DC Converters in Distributed Electric Propulsion Systems 5

Research on Bidirectional DC-DC Converters in Distributed El...

引用

2023 5th International Conference on Energy Systems and Electrical Power, ICESEP 2023

作者： Liu, Pengcheng Yang, Minsheng College of Information and Electrical Engineering Hunan University of Science and Technology Hunan Xiangtan411100 China College of Computer and Electrical Engineering Hunan University of Arts and Science Hunan Changde415000 China

This paper investigates bidirectional DC-DC converters in distributed electric propulsion systems, focusing on the dual active bridge (DAB) converter. To minimize voltage fluctuations in aircraft operating under complex conditions, a virtual voltage compensation control strategy based on active disturbance rejection (ADR-VVCC) is presented. The presented control strategy is grounded on the working characteristics under single-phase-shift (SPS) and introduces a virtual voltage to compensate for voltage fluctuations and degraded dynamic performance caused by the inherent uncertainty of converter parameters and power losses during the energy transfer process. The active disturbance rejection control is incorporated to replace traditional PI control, thereby enhancing the converter’s dynamic performance. Simulation outcomes demonstrate that the presented control strategy effectively improves the converter’s dynamic performance and maintains output voltage stability. © 2023 Institute of Physics Publishing. All rights reserved.

关键词： Energy transfer

来源：评论

学校读者我要写书评

暂无评论

Cross Online Assignment of Hybrid Task in Spatial Crowdsourcing 40

Cross Online Assignment of Hybrid Task in Spatial Crowdsourc...

引用

40th IEEE International Conference on Data engineering, ICDE 2024

作者： Liu, Zhao Xiao, Guoqing Zhou, Xu Qin, Yunchuan Gao, Yunjun Li, Kenli College of Computer Science and Electronic Engineering Hunan University China College of Computer Science and Technology Zhejiang University China

ISBN: (纸本)9798350317152

Task assignment is a fundamental problem in spatial crowdsourcing. In many spatial crowdsourcing platforms, such as Didi, AMAP, and Uber, there are hybrid tasks, including real-time and reservation-type tasks, which are with different constraints and unevenly distributed in spatial and temporal. For these hybrid tasks, most existing studies suffer from low task completion rate and low profit for two reasons: firstly, they focus on homogeneous tasks with uniform constraints, and assign hybrid tasks separately;secondly, they cannot effectively address the uneven distribution of hybrid tasks. Inspired by this, we delve into the problem of online hybrid task assignment (HyTAO) with the goal of maximizing total revenue by simultaneously assigning both real-time and reservation-type tasks online for the first time. We prove the NP-hardness of the offline version of the HyTAO problem. To solve HyTAO effectively, we utilize a cross-platform cooperation model to tackle the challenge of non-uniform distribution. Following this, we design a binary tree-based search algorithm, namely BTS, which is capable of uniformly processing various types of tasks and quickly searching for available workers. Additionally, we discuss the parallel optimization strategies of BTS. To further enhance performance, we develop TBTS, which identifies tasks with high increased revenue based on a threshold. Finally, we conduct a comprehensive analysis of the complexity and competitive ratio of both BTS and TBTS. Extensive experiments are performed to demonstrate the efficiency of our approaches. © 2024 IEEE.

关键词： Crowdsourcing

来源：评论

学校读者我要写书评

暂无评论

NWSTAN: a lightweight dynamic spatial–temporal attention network for traffic prediction

引用

Neural Computing and Applications 2024年 1-16页

作者： Sun, Jingru Zhang, Yao Qiu, Ziyu Cheng, Qixuan Xiao, Zhu Chongqing Research Institute of Hunan University Changsha China College of Computer Science and Electronic Engineering Hunan University Changsha China

Advanced deep learning technology has promoted the development of high-accuracy traffic prediction algorithms. However, existing algorithms struggle to balance model size and predictive accuracy, lack the ability to model the spatial correlation effectively, and require many parameters, resulting in a significantly larger model size. To overcome these challenges, this paper introduces a new solution, the lightweight Nodewalk Spatial–Temporal Attention Network (NWSTAN). NWSTAN uses an improved lightweight nodewalk algorithm based on Node2vec to model the correlations between sensors on different roads dynamically. Additionally, it employs a spatiotemporal feature extraction module that leverages the attention mechanism to extract relevant features from the traffic flow data. Experiments conducted on two real-world datasets show that NWSTAN reduced the mean absolute error (MAE) by 3-5% compared to the baseline model while significantly reducing the number of parameters (by at least 27%). This makes NWSTAN easier to integrate into existing edge computing devices, broadening its potential for real-world applications. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2024.

关键词： Prediction models

来源：评论

学校读者我要写书评

暂无评论

Emergency Transportation and Structural Prediction and Optimization of Goods Based on ARIMA and Multi-objective E-commerce Logistics Network Model 1

Emergency Transportation and Structural Prediction and Optim...

引用

1st IEEE International Conference on Applied Intelligence and Sustainable Computing, ICAISC 2023

作者： Nie, Yiyang Chen, Xiang Wu, Xuanli Deng, Zihao Hunan University of Science and Technology School of Computer Science and Engineering Xiangtan China Hunan Key Laboratory for Service Computing and Novel Software Technology Xiangtan China Hunan University of Science and Technology Shcool of Mathematics and Computational Science Xiangtan China

ISBN: (纸本)9798350323795

With the development of the internet, online shopping has gradually become a popular way of shopping among the general public, which in turn poses a greater challenge to the e-commerce logistics network. Predicting the volume of goods for each logistics site and route, and establishing a model for quickly adjusting the network in response to sudden situations can save logistics network costs and improve its efficiency. Therefore, this article has done the following work: first, it establishes an effective logistics network volume prediction model;second, for the two scenarios of network structure that cannot be modified and can be modified, it provides a model that can effectively guide the adjustment of the volume of goods on each route when a logistics site is closed;finally, it establishes a logistics network evaluation model to evaluate the importance of logistics sites and routes. © 2023 IEEE.

关键词： Multiobjective optimization

来源：评论

学校读者我要写书评

暂无评论

Deep learning for iris recognition: a review

引用

Neural Computing and Applications 2025年 1-49页

作者： Yin, Yimin He, Siliang Zhang, Renye Chang, Hongli Zhang, Jinghua School of Mathematics and Statistics Hunan First Normal University Hunan Changsha410205 China School of Computer Science Hunan First Normal University Changsha410205 China School of Information Science and Engineering Southeast University Nanjing210096 China College of Intelligence Science and Technology National University of Defense Technology Hunan Changsha410073 China

Iris recognition is a secure biometric technology known for its stability and privacy. With no two irises being identical and little change throughout a person’s lifetime, iris recognition is considered more reliable and less susceptible to external factors than other biometric recognition methods. Unlike traditional machine learning-based iris recognition methods, deep learning technology does not rely on feature engineering and boasts excellent performance. This paper collects 131 relevant papers to summarize the development of iris recognition based on deep learning. We introduce the background of iris recognition and the motivation and contribution of this survey. Then, we present the common datasets widely used in iris recognition. After that, we summarize the key tasks involved in the process of iris recognition based on deep learning technology, including identification, segmentation, presentation attack detection, and localization. Finally, we discuss the challenges and potential development of iris recognition. This review provides a comprehensive sight of the research of iris recognition based on deep learning. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2025.

关键词： Contrastive Learning

来源：评论

学校读者我要写书评

暂无评论

Hot Compression Mechanical Behavior of Solution Heat‑Treated and Pre‑aged Mg–Zn–Gd–Er Alloys

引用

Acta Metallurgica Sinica(English Letters) 2023年第3期36卷 469-485页

作者： Bo Che Liwei Lu Longfei Liu Yan Yang Wei Kang Jun Luo Zhiqiang Wu Yongfeng Qiu School of Materials Science and Engineering Hunan University of Science and TechnologyXiangtan 411201China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Hunan Provincial Key Laboratory of Vehicle Power and Transmission System Hunan Institute of EngineeringXiangtan 411104China Guiyang Aluminum Magnesium Design&Research Institute Co. LtdGuiyang 550081China School of Automation Central South UniversityChangsha 410083China

The mechanical behavior of solution heat-treated and pre-aged Mg–6Zn–1Gd–1Er alloys during hot compression(from 180 to 330℃)has been *** results showed that the flow stress curves of the pre-aged sample(PAS)intersected with that of the solution heat-treated sample(SHTS)during hot *** 180℃,when the true strain is 0.27 and 0.47,the PAS showed larger and smaller stress(210.80 MPa vs.207.58 MPa and 205.67 MPa vs.207.93 MPa)than the SHTS,*** phenomena were due to the stronger interaction of W phase and dislocations/twins under the strain of 0.27,while dynamic recrystallization softening occurred under the strain of *** the temperature increased to 330℃,the flow stress of PAS and SHTS showed an opposite trend to that of 180℃.Continuous dynamic recrystallization and particle stimulated nucleation based on slip operations are the main deformation mechanisms under 330℃.At the true strain is 0.33 and 0.53,the PAS has smaller and larger stress(61.32 MPa vs.63.69 MPa and 58.75 MPa vs.57.09 MPa)than the SHTS,*** increasing deformation resistance of dynamic precipitation improved the flow stress under smaller strain and dynamic recrystallization decreased the flow stress under high strain,which resulted the opposite phenomena of SHTS.

关键词： Mg-6Zn-1Gd-1Er alloy Mechanical behavior Precipitates Twin Dynamic recrystallization

来源：评论

学校读者我要写书评

暂无评论

Container-based data-intensive application scheduling in hybrid cloud-edge collaborative environment

Container-based data-intensive application scheduling in hyb...

引用

作者： Tang, Bing Luo, Jincheng Zhang, Jiaming School of Computer Science and Engineering Hunan University of Science and Technology Hunan Xiangtan China Hunan Key Laboratory for Service Computing and Novel Software Technology Hunan University of Science and Technology Hunan Xiangtan China School of Information and Communication Engineering Guangzhou Maritime University Guangdong Guangzhou China School of Information Engineering Wuhan University of Technology Hubei Wuhan China

Container virtualization technology represented by Docker has been widely used in the industry due to its advantages of lightweight, fast deployment, and easy portability. It can bring convenience to system deployment, operation, and maintenance. This article considers the implementation of AI-based IoT applications based on Docker and container technology in a cloud-edge collaborative environment. Three typical data-intensive applications, preprocessing, training, and inference in machine learning, are deployed using Docker containers. For these three types of tasks, this article proposes a container-based data-intensive application scheduling framework. Using an attribute-based data-driven method, a new scheduling approach considering multiple weighting factors is proposed, which is called DICS-OPT. The cloud nodes and edge nodes are scored and sorted uniformly. The container is scheduled to the node with the highest score, and then the task data is transmitted to the node to execute the task. NSGA-III-based genetic algorithm has been proposed to search for the optimal weighting factors. This article introduces the implementation of the prototype system and builds a cloud-edge collaborative testbed consisting of Raspberry Pis and PCs. The performance evaluation results indicates that the proposed scheduling approach outperforms existing approaches. Compared with existing approaches, DICS-OPT improves the average edge resource utilization by 10.05% to 69.04%, and saves the cloud resource cost by 16.02% to 36.68%. © 2023 John Wiley & Sons Ltd.

关键词： Edge computing

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：