检索结果-内蒙古大学图书馆

Study on Clamping Type DC Circuit Breaker with Short Fault Isolation Time and Low Energy Dissipation

CSEE Journal of Power and Energy systems 2023年第5期9卷 1743-1752页

作者： Xibei Zhao Gen Li Jianzhong Xu Jinsha Yuan the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China the Electric Energy Group Department of Engineering TechnologyTechnical University of Denmark(DTU)2750 BallerupDenmark

The development of DC grids faces challenges from DC fault *** conventional DC circuit breaker(DCCB)employs metal-oxide varistor(MOV)to isolate the faulted line,in which the fault isolation process is coupled with the energy dissipation *** this study,a clamping type DCCB(CTCB)using internal capacitors to clamp the converter voltage is *** to the proposed configuration,fault isolation and energy dissipation are decoupled,resulting in a fast fault isolation and low energy dissipation compared to the conventional *** working principle of the proposed CTCB is presented and verified in a DC grid simulation model.A comparison is made with the traditional *** fault isolation time can be reduced by 34.5%.The dissipated energy can be reduced by 17.4%.The energy dissipation power can be reduced by 76.2%.

关键词： DC circuit breaker DC fault DC protection,HVDC grid MMC

来源：评论

学校读者我要写书评

暂无评论

A Survey on Evolutionary Computation Based Drug Discovery

引用

IEEE Transactions on Evolutionary Computation 2024年第3期29卷 1-1页

作者： Yu, Qiyuan Lin, Qiuzhen Ji, Junkai Zhou, Wei He, Shan Zhu, Zexuan Tan, Kay Chen College of Computer Science and Software Engineering Shenzhen University Shenzhen China National Engineering Laboratory for Big Data System Computing Technology Shenzhen University Shenzhen China School of Computer Science University of Birmingham Bir-mingham UK Department of Computing The Hong Kong Poly-technic University Hong Kong Hong Kong

Drug discovery is an expensive and risky process. To combat the challenges in drug discovery, an increasing number of researchers and pharmaceutical companies recognize the benefits of utilizing computational techniques. Evolutionary computation (EC) offers promise as most drug discovery problems are essentially complex optimization problems beyond conventional optimization algorithms. EC methods have been widely applied to solve these complex optimization problems especially in lead com-pound generation and molecular virtual evaluation, substantially speeding up the process of drug discovery and development. This article presents a comprehensive survey of EC-based drug discovery methods. Particularly, a new taxonomy of the methods is provided and the advantages and limitations of the methods are reviewed. In addition, the potential future directions of EC-based drug discovery are discussed and the publicly available resources including databases and computational tools are compiled for the convenience of researchers seeking to pursue this field. IEEE

关键词： Lead compounds

来源：评论

学校读者我要写书评

暂无评论

A 0.89 to 2.1 GHz Tunable Power Amplifier for Multi-band Transmitter 12

A 0.89 to 2.1 GHz Tunable Power Amplifier for Multi-band Tra...

引用

12th International Conference on Power Science and engineering, ICPSE 2023

作者： Sapawi, R. Kipli, K. Julai, N. Hong Ping, K. Zainol Murad, S.A. Awg Salleh, D.N.S. Universiti Malaysia Sarawak Department of Electrical and Electronics Engineering Sarawak Kota Samarahan Malaysia Universiti Malaysia Center of Excellent for Micro System Technology Faculty of Electronic Engineering & Technology Perlis Arau Malaysia

ISBN: (纸本)9798350342383

This paper presents a multi-band power amplifier by using Benzocyclobutene inductor and tunable barium strontium titanate capacitor to achieve high quality (Q) factor to improve narrow bandwidth in tunable of power amplifier. The proposed power amplifier employed two stages with resistive shunt feedback at the input stage to provide a broadband gain and steady wideband input matching. Tunable frequency range from 0.89 GHz to 2.1 GHz is conducted by tunable BST capacitor from 1 pF to 20 pF. The tunable power amplifier achieves high power gain, good input and output matching, low power consumption and good power added efficiency over all frequency range of interest. It can be concluded that the proposed multi-band power amplifier is quite promising for future mobile terminals application. © 2023 IEEE.

关键词： Power amplifiers

来源：评论

学校读者我要写书评

暂无评论

A Secure and Cost-Effective Training Framework Atop Serverless Computing for Object Detection in Blasting

引用

Computer Modeling in engineering & Sciences 2024年第5期139卷 2139-2154页

作者： Tianming Zhang Zebin Chen Haonan Guo Bojun Ren Quanmin Xie Mengke Tian Yong Wang Department of Computer and Science Shanghai Jiaotong UniversityShanghai200240China Aerospace System Engineering Shanghai Shanghai200240China State Key Laboratory of Precision Blasting Jianghan UniversityWuhan430056China Beijing Microelectronics Technology Institute Beijing100076China

The data analysis of blasting sites has always been the research goal of relevant *** rise of mobile blasting robots has aroused many researchers’interest in machine learning methods for target detection in the field of *** Computing can provide a variety of computing services for people without hardware foundations and rich software development experience,which has aroused people’s interest in how to use it in the field ofmachine *** this paper,we design a distributedmachine learning training application based on the AWS Lambda *** on data parallelism,the data aggregation and training synchronization in Function as a Service(FaaS)are effectively *** also encrypts the data set,effectively reducing the risk of data *** rent a cloud server and a Lambda,and then we conduct experiments to evaluate our *** results indicate the effectiveness,rapidity,and economy of distributed training on FaaS.

关键词： Serverless computing object detection blasting

来源：评论

学校读者我要写书评

暂无评论

Effect of Hybrid Surface Treatment Composed of Plasma Nitriding and Various DLC Coatings on Properties of Stainless Steel SUS316 by

引用

Zairyo/Journal of the Society of Materials Science, Japan 2023年第10期72卷 721-728页

作者： Morita, Tatsuro Andatsu, Koichi Takesue, Shogo Nakamura, Morimasa Kagaya, Chuji Kyoto Institute of Technology Gosyonouchi-cho Matsugasaki Sakyo-ku Kyoto606-8585 Japan Department of Mechanical and System Engineering Graduate School of Science and Technology Kyoto Institute of Technology Gosyokaido-cho Matsugasaki Sakyo-ku Kyoto606-8585 Japan Department of Mechanical Engineering and Science Faculty of Science and Engineering Doshisha University Miyakodani Tatara Kyotanabe610-0394 Japan Chubu University 1200 Matsumoto-cho Kasugai487-8501 Japan

The effect of hybrid surface treatment composed of plasma nitriding and various DLC (diamond-like carbon) coatings on the tribological properties, the mechanical properties and the fatigue properties of austenitic stainless steel SUS316 was comprehensively investigated. In this hybrid surface treatment, plasma nitriding was made as a pre-treatment and then the following three kinds of DLC films were coated by UBMS (unbalanced magnetron spattering) method: a regular DLC film, a silicon-doped DLC (Si-DLC) film and a titanium-doped DLC (Ti-DLC) film, respectively. As the test temperature was increased, the change to the graphite structure with high solid-lubricity was promoted, so the friction coefficients of all DLC-coated materials were reduced. The friction coefficient of the Si-DLC material was the lowest at room temperature, but it became comparable to that of the regular DLC material when the test temperature was beyond 373 K. The Ti-DLC material had a higher friction coefficient than the other two DLC-coated materials without depending on the test temperature. Since the microstructure of the substrate was not influenced by plasma nitriding and each DLC coating, there was no marked change in the mechanical properties with them. The hardened layer formed by plasma nitriding effectively suppressed the initiation of fatigue cracks from the surface and markedly improved the fatigue strength. Also in all DLC-coated materials, since the hardened layers formed under the DLC films suppressed the initiation of fatigue cracks, their fatigue strengths reached the same level as that of the plasma-nitrided material. ©2023 The Society of Materials Science, Japan.

关键词： Coated materials

来源：评论

学校读者我要写书评

暂无评论

Grinding preparation of 2D/2D g-C3N4/BiOCl with oxygen vacancy heterostructure for improved visible-light-driven photocatalysis

引用

Carbon Research 2024年第1期3卷 1-12页

作者： Hou, Jianhua Wang, Haoyi Qin, Rongrong Zhang, Qikai Wu, Di Hou, Zhenhua Yang, Wei Hussain, Asif Tahir, Muhammad Yin, Weiqin Zhang, Yongcai Wang, Xiaozhi College of Environmental Science and Engineering Yangzhou University Yangzhou225000 China Beijing Xinfeng Aerospace Equipment Co. Ltd Beijing100854 China Jiangxi Xinda Hangke New Materials Technology Co. Ltd Nanchang330096 China Beijing System Design Institute of Electro-Mechanic Engineering Beijing100005 China Department of Physics Division of Science & Technology University of Education Lahore Pakistan School of Chemistry and Chemical Engineering Yangzhou University Yangzhou225009 China

A novel 2D/2D g-C3N4/BiOCl (CN/BOC) heterojunction photocatalyst was synthesized by grinding appropriate amounts of CN, Bi(NO3)3·5H2O, glacial acetic acid and KCl at room temperature. The porous CN nanosheets not only facilitate the in situ nucleation and growth of BOC to form thin nanosheets and constitute an intimate contact interface, but also introduce more oxygen vacancies (OVs) in the grinding process. The 2D/2D CN/BOC heterojunction had a good interface and generates a built-in electric field, which can improve the separation of e− and h+. The synergistic effect of the heterostructure and OVs made the photocatalyst have significantly better performance than CN and BOC alone under visible light. The most efficient CN/BOC-5 could achieve a tetracycline (TC) degradation rate of 89.8% within 2 h, which was 1.9 and 1.2 times faster than CN and BOC, respectively. It catalyzed the reduction of CO2 to CO at a rate of 2.00 μ mol h−1 g−1, 1.1 and 3.2 times faster than CN and BOC, respectively. The mechanism for the photocatalysis of CN/BOC-5 was revealed. It was confirmed that the efficiency of photo-induced carrier separation and visible-light photo-absorption were both considerably increased by the synergistic interaction between OVs and 2D/2D heterojunction. This research may open up new possibilities for the logical design of efficient photocatalysts through combining 2D/2D heterojunctions with OVs for environmental remediation. Graphical Abstract: [Figure not available: see fulltext.] © 2024, The Author(s).

关键词： Nanosheets

来源：评论

学校读者我要写书评

暂无评论

Designing Sustainable Closed-Loop Supply Chain Network Based on a Circular Economy Approach: Under Uncertainty During the Post-COVID Era

引用

Circular Economy and Sustainability 2025年 1-43页

作者： Abbasi, Sina Rokhva, Shayan Farahmand, Kazem Ghasemi, Peiman Shahab, Erfan Department of Industrial Engineering Lahijan Branch Islamic Azad University Lahijan Iran Department of Information Technology Faculty of Industrial and System Engineering Tarbiat Modares University Tehran Iran Department of Economics Faculty of Economics and Administrative Sciences Ferdowsi University of Mashhad Mashhad Iran Department of Business Decisions and Analytics University of Vienna Kolingasse 14-16 Vienna 1090 Austria Department of Industrial Engineering Toronto Metropolitan University Toronto Canada

Sustainable closed-loop supply chain networks (SCLSCNs) are a key component of the circular economy and aim to reduce waste and increase resource efficiency. The multi-product SCLSCN under uncertainty during the post-COVID pandemic is presented in this study. After establishing a mathematical model for the design of a closed-loop network (CLN), a series of potential scenarios are used to account for parameter uncertainty. In this paper, a hybrid metaheuristic method is proposed to tackle this NP-hard problem for solving the multi-objective (MO) optimization. We refer to the hybrid algorithm as HWS (a hybrid method of WOA and SA). It is an optimizer that uses the relatively new whale optimization algorithm (WOA) and the widely used simulated annealing (SA) technique. Hybrid metaheuristics are one of the most interesting current trends in MO optimization. The aim of utilizing SA is to increase the yield by searching the most promising regions found by the WOA algorithm. Analytical and numerical data are given to illustrate the reliability and suitability of the proposed model using real case studies in the electronics industry. Finally, a sensitivity analysis is conducted to assess how consumer demand affects different aspects of sustainability. The results emphasize that the achievement of economic, environmental, and social goals is significantly affected by COVID-19. The scope of the economic aspect thus tends to increase with increasing changes in customer demand in the post-COVID-19. The bad social effects increased due to the number of days lost due to illness. These effects continue in the post-disaster period. On the other hand, carbon dioxide (CO₂) emissions have decreased due to lockdowns during the disaster, leading to greater health and it continues after COVID-19. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Circular closed-loop supply chain Multi-objective optimization Simulated annealing Uncertain programming Whale optimization algorithm

来源：评论

学校读者我要写书评

暂无评论

Cataract Surgical Instruments Segmentation Free of Motion Blur Influence 24

Cataract Surgical Instruments Segmentation Free of Motion Bl...

引用

13th International Conference on Bioinformatics and Biomedical Science, ICBBS 2024

作者： Sun, Xuebin Wang, Jinxi Yang, Xiaofei School of Electrical Automation and Information Engineering Tianjin University Tianjin China Department of Aerospace Laser Technology and System Shanghai Institute of Optics and Fine Mechanics Shanghai China

ISBN: (纸本)9798400717956

Most of the existing cataract surgical instrument segmentation algorithms fail to consider the motion blur caused by the surgeon's hand movement or defocused camera. Most prior deblurring methods are oriented to visual tasks to merely recover the structure information from motion-blurred images. However, during surgical instrument segmentation, it is important to obtain the exact location of the surgical instruments at the current time to pave the way for subsequent downstream tasks, such as tracking and position estimation. In this work, we propose a spatiotemporal (ST) information-based network, consisting of the deblurring module and a subsequent segmentation module, for cataract surgical instrument segmentation free of motion blur influence to address the missing gap in the existing literature. The ST recurrent network with a series of ST-LSTM and gradient highway units removes the motion blur, which then enables for accurate semantic segmentation. The ST network model subsequently captures the temporal and spatial correlation for semantic segmentation. Experimental results quantitatively and qualitatively demonstrate that our method outperforms the state-of-the-art on our self-constructed dataset and the CaDIS benchmark dataset. © 2024 Copyright held by the owner/author(s). Publication rights licensed to ACM.

关键词： Semantic Segmentation

来源：评论

学校读者我要写书评

暂无评论

Reliability-Based Topology Optimization of Fail-Safe Structures Using Moving Morphable Bars

引用

Computer Modeling in engineering & Sciences 2023年第9期136卷 3173-3195页

作者： Xuan Wang Yuankun Shi Van-Nam Hoang Zeng Meng Kai Long Yuesheng Wang School of Mechanical Engineering Tianjin UniversityTianjin300072China Department of Engineering Mechanics Hefei University of TechnologyHefei230009China Mechanical Engineering Institute Vietnam Maritime UniversityHai Phong City180000Vietnam State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing102206China

This paper proposes an effective reliability design optimizationmethod for fail-safe topology optimization(FSTO)considering uncertainty based on the moving morphable bars method to establish the ideal balance between cost and robustness,reliability and structural *** this end,a performancemeasure approach(PMA)-based doubleloop optimization algorithmis developed tominimize the relative volume percentage while achieving the reliability *** ensure the compliance value of the worst failure case can better approximate the quantified design requirement,a p-norm constraint approach with correction parameter is ***,the significance of accounting for uncertainty in the fail-safe design is illustrated by contrasting the findings of the proposed reliabilitybased topology optimization(RBTO)method with those of the deterministic design method in three typical *** Carlo simulation shows that the relative error of the reliability index of the optimized structure does not exceed 3%.

关键词： Topology optimization fail-safe design uncertainty reliability-based topology optimization moving morphable bars

来源：评论

学校读者我要写书评

暂无评论

Multi-party secure communication using blockchain over 5G

Multi-party secure communication using blockchain over 5G

引用

International Conference on Artificial Intelligence, Blockchain, Computing and Security, ICABCS 2023

作者： Archana, K. Kareem, Z.H. Al-Farhani, Liwa H. Bagyalakshmi, K. Jenvi, Ignatia K. Majella Kumar, Ashok Department of Computer Engineering Pimpri Chinchwad College of Engineering and Research Maharashtra Pune India Medical Instrumentation Techniques Engineering Department Al-Mustaqbal University College Babylon Iraq System Analysis Control and Information Processing dep Academy of Engineering RUDN University Moscow Russia Sri Ranganathar Institute of Engineering and Technology Coimbatore India Mathematics Department Saveetha School of Engineering SIMATS Saveetha Nagar Chennai India Department of Computer Science Banasthali Vidyapith Rajasthan Banasthali India

ISBN: (纸本)9781032669663

One of the most critical problems facing the blockchain technology industry right now is how to protect the privacy of users’ data on the blockchain in a way that is both effective and cheap. Based on the Pedersen commitment and the Schnorr protocol, this study comes up with a secure multi-party computing protocol (BPLSM). By making the structure of the protocol and doing formal proof calculations, it has been shown that the protocol can be used in the blockchain network to combine private messages for efficient signing while keeping people’s identities secret. Furthermore, by looking at the nature and security of the protocol, it is also possible to find that the BPLSM protocol on the blockchain has a low cost of computing and a high level of information secrecy. Furthermore, it was found that the BPLSM protocol takes less time to check than the current mainstream BLS signature in a simple multi-party transaction with a fixed number of participants. © 2024 The Author(s).

关键词： Blockchain

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：