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Serrated chip formation in machining of difficult to cut metallic materials: a comprehensive review

Critical Reviews in Solid state and Materials Sciences 2025年

作者： Zhao, Zejia Liu, Chujun Xu, Bo Wang, Jingwei Yao, Yingxue Yin, Tengfei To, Suet Yang, Yang Institute of Semiconductor Manufacturing Research College of Mechatronics and Control Engineering Shenzhen University Shenzhen China State Key Laboratory of Ultra-precision Machining Technology Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Kowloon Hong Kong Department of Materials Science Shenzhen MSU-BIT University Shenzhen China Shenzhen China

Serrated cutting chips are usually observed in the machining of difficult to cut metallic materials such as titanium alloys, steels, and nickel-based alloys. Understanding the formation mechanism and influencing factors to generate serrated chips is meaningful for improving the machinability of the difficult to cut materials since the formation of serrated chips poses high risks on the vibration of cutting tools and further affects the surface quality of the workpiece. To date, extensive studies have been conducted on the investigation of serrated chip formation in the machining of difficult to cut materials, but there is still a lack of a comprehensive review to clarify the formation mechanism and summarize the factors affecting the serrated chip characteristics. In this review, two commonly used mechanisms, i.e., adiabatic shear band (ASB) theory and periodical crack formation (PCF) theory, are summarized and discussed with respect to theoretical analyses and experimental verifications. Serrated chip formation in different difficult to cut alloys was also systematically reviewed, considering materials inherent properties such as high hardness, poor thermal conductivity, or low fracture toughness. Besides, some critical factors, including cutting speeds, feed rates, cutting tools, external energy sources, humidity, and temperature are highlighted to illustrate their effects on the serrated chip formation. In addition, challenges and perspectives about the serrated chip formation in machining of difficult to cut metallic materials are proposed to give instruction to future research. © 2025 Taylor & Francis Group, LLC.

关键词： Titanium alloys

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A feedback control method for the stabilization of a nonlinear diffusion system on a graph

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Chinese Physics B 2014年第8期23卷 240-245页

作者：于欣许超林群 Ningbo Institute of Technology Zhejiang University The State Key Laboratory of Industrial Control Technology and Institute of Cyber-Systems & Control Zhejiang University Department of Mathematics and Statistics Curtin University

In this paper, we consider the internal stabilization problems of FitzHugh-Nagumo （FHN） systems on the locally finite connected weighted graphs, which describe the process of signal transmission across axons in neurobiology. We will establish the proper condition on the weighted Dirichlet-Laplace operator on a graph such that the nonlinear FHN system can be stabilized exponentially and globally only using internal actuation over a sub-domain with a linear feedback form.

关键词： FitzHugh-Nagumo system graph stabilization internal controller

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EK-Net++: Real-time scene text detection with expand kernel distance and Epoch Adaptive Weight

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Expert systems with Applications 2025年 267卷

作者： Zhu, Boyuan Chen, Xi Tang, Quan Chen, C.L. Philip Liu, Fagui Computer Science and Engineering South China University of Technology Guangzhou510006 China Cyberspace Security Research Center Peng Cheng Laboratory Shenzhen518066 China State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing100080 China

Recently, scene text detection has received significant attention due to its wide applications. Accurate detection in complex scenes of multiple scales, orientations, and curvature remains a challenge. Component-based methods have emerged as the dominant approach for offering a more flexible way to achieve superior performance. However, Component-based methods employ the Vatti clipping algorithm for multi-instance training to handle the difficulty of arbitrary-shaped text. Yet we identify several bias results from these approaches called the "shrinked kernel" leading to decreased accuracy. Additionally, almost all text detection methods fail to consider the characteristics of different datasets and directly assign fixed loss weights to multi-instances. To address these limitations, we propose a new approach named Expand Kernel Network (EK-Net++), which presents the expand kernel distance map to compensate for the previous deficiency and incorporates three-stage regression to complete integral instance detection. Furthermore, we design the Epoch Adaptive Weight algorithm which dynamically distinguishes the characteristics of different datasets. EK-Net++ not only achieves precise positioning of arbitrary-shaped text but also strikes a balance between performance and speed. Evaluation results show that EK-Net++ attains state-of-the-art or competitive performance compared to other advanced methods, e.g., F-measure of 86.72% at 35.42 FPS on ICDAR 2015, F-measure of 85.83% at 40.13 FPS on CTW1500. © 2024 Elsevier Ltd

关键词： Epoch Adaptive Weight Expand kernel distance Real-time Scene text detection

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Performance-Aware control of Modular Batteries For Fast Frequency Response

arXiv

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arXiv 2025年

作者： He, Yutong Ruan, Guangchun Zhong, Haiwang State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing100084 China Lab for Information and Decision Systems Massachusetts Institute of Technology CambridgeMA02139 United States

Modular batteries can be aggregated to deliver frequency regulation services for power grids. Although utilizing the idle capacity of battery modules is financially attractive, it remains challenging to consider the heterogeneous module-level characteristics such as dynamic operational efficiencies and battery degradation. In addition, real-time decision making within seconds is required to enable fast frequency response. In order to address these issues, this paper proposes a performance-aware scheduling approach for battery modules to deliver fast frequency response (FFR) support. In particular, the conduction loss and switching loss of battery packs as well as converters are captured within a mix-integer quadratic constrained program (MIQCP). The cycle-based aging model identifies the aging cost of battery modules during frequent cycling by introducing the aging subgradient calculation and linearization. Case studies based on real-world battery data show that the proposed scheduling approach can effectively reduce power loss cost by nearly 28%-57% and battery aging cost by 4%-15% compared to conventional methods, which can also enhance the SoC balance. Copyright © 2025, The Authors. All rights reserved.

关键词： Battery management systems

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Node-Decomposition Privacy-Preserving for Finite-Time Secondary control of DC Microgrids

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IEEE Transactions on Smart Grid 2025年

作者： Wu, Han Zhu, Si-Min Chai, Li Zhu, Zhen-Hua Tian, Yu-Chu Wuhan University of Science and Technology Engineering Research Center of Metallurgical Automation and Measurement Technology School of Artificial Intelligence and Automation Wuhan430081 China Zhejiang University State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Hangzhou310027 China Huzhou Institute of Industrial Control Technology Huzhou China Queensland University of Technology School of Computer Science BrisbaneQLD4001 Australia

In the distributed secondary control of DC microgrids, achieving both rapid convergence and robust information security is critical for enhancing control performance and maintaining power quality. However, current privacy-preserving approaches often compromise either control performance or privacy preservation performance. To address this challenge, this paper presents a node-decomposition privacy-preserving (NDPP) method for fully distributed, finite-time secondary control in DC microgrids. By splitting each node in the communication graph into multiple sub-nodes, the method enhances both convergence speed and privacy preservation without sacrificing control accuracy. Sub-nodes communicate within groups, and the topology of the generated graph is concealed from malicious nodes and eavesdroppers. Theoretical analysis is provided to prove finite-time voltage regulation and current sharing with privacy preservation against malicious nodes and external eavesdroppers. Simulations are conducted to verify the effectiveness of the method in maintaining control performance and power quality. © 2010-2012 IEEE.

关键词： Privacy by design

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Forced event-triggered finite-time extended dissipative control for a class of singularly perturbed switched systems

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ISA Transactions 2025年

作者： Li, Xueyang Mao, Weijie Li, Jingzhao Zhu, Hongbo Jia, Xiaofen Key Laboratory of intelligent mining and beneficiation equipment for mechanical industry Anhui University of Science and Technology Huainan232001 China Institute of Cyber-Systems and Control Zhejiang University Hangzhou310012 China Anhui Chunsheng New Energy Technology Co. Ltd. Huainan232299 China

In this paper, the issue of event-triggered finite-time extended dissipative control is investigated for singularly perturbed switched systems(SPSSs). In the application of event-triggered technique in switched systems, the transmitted information is often out of sync with the system mode. To avoid this asynchrony problem, a forced-triggering dynamic event-triggered protocol (FTDETP) is introduced. Events are force triggered at mode switching instants, and the event-triggered frequency is depend on the change rate of the system state. Based on ɛ−dependent Lyapunov method, sufficient conditions for finite-time extended dissipative performance of the considered systems are devised and forced-triggering event-triggered controllers are designed. Finally, the validity and practicability of the proposed theorems are illustrated on an inverted pendulum control system and a simple circuit system. © 2025 International Society of Automation

关键词： Feedback

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Engineering CRISPR/Cas12-based biosensors: Recent advances and future perspectives

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TrAC - Trends in Analytical Chemistry 2025年 191卷

作者： Yin, Lijuan Zhou, Caihong Gao, Baoxue Liu, Fufeng Ma, Long Guo, Fei State Key Laboratory of Food Nutrition and Safety Key Laboratory of Industrial Microbiology Ministry of Education Tianjin Key Laboratory of Industry Microbiology National and Local United Engineering Lab of Metabolic Control Fermentation Technology China International Science and Technology Cooperation Base of Food Nutrition/Safety and Medicinal Chemistry College of Biotechnology Tianjin University of Science and Technology Tianjin300457 China NHC Key Laboratory of Systems Biology of Pathogens Institute of Pathogen Biology and Center for AIDS Research Chinese Academy of Medical Sciences & Peking Union Medical College Beijing100730 China

Rapid, sensitive, and accurate biosensing is instrumental for clinical diagnostics, food safety, and environmental monitoring. The CRISPR/Cas12 system has emerged as a robust biosensing tool, leveraging its biocompatibility, distinctive cleavage activity, and user-friendly design. In recent years, numerous CRISPR/Cas-based biosensing strategies have been developed to enhance detection sensitivity, specificity, and portability, significantly advanced the molecular diagnostics field. This review systematically discusses recent advances in various engineering strategies aimed at improving the performance of CRISPR/Cas12-based biosensors, with emphasis on their practical applications. Specifically, progresses are highlighted in optimizing Cas effector proteins, CRISPR RNAs, and reaction buffer formulations. Diverse signal output methodologies are compared including fluorescence, colorimetry, electrochemical sensing, surface-enhanced Raman spectroscopy, and deep-learning-assisted detection techniques. Finally, challenges and future prospectives of CRISPR/Cas12-based biosensing technologies are discussed to help the development of optimal biosensing tools. © 2025

关键词： Error detection

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FDCA-DSTGCN: A Wind Farm Cluster Power Day-ahead Prediction Model Based on Frequency Domain Information Gain and Dynamic Trend Sensing

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IEEE Transactions on Sustainable Energy 2025年

作者： Yang, Mao Niu, Jiajun Wang, Bo Huang, Dawei Su, Xin Ma, Chenglian Ministry of Education Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Jilin132012 China China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing100912 China

Accurate wind farm cluster power prediction (WFCPP) is of vital significance for new power systems with large-scale wind power integration. The current WFCPP modeling method ignores the important role of wind direction and frequency domain information, resulting in insufficient use of spatial information and difficult to improve the prediction accuracy. In order to solve the above problems, a day-ahead power prediction model for wind farm cluster power is proposed based on information gain in frequency domain and dynamic trend sensing. Firstly, a cluster division method based on graph theory and progressive fusion of multiple information is proposed, and a virtual information node is set up. Secondly, a method to identify prevailing wind direction under time window is proposed for subsets, and a dynamic weighted directed graph structure is designed based on prevailing wind direction and wind speed. Thirdly, a dynamic spatio-temporal graph convolutional network model with frequency domain gain channel attention mechanism (FDCA-DSTGCN) is proposed to integrate the above information and complete the prediction. Finally, the proposed method is applied to a wind farm cluster in Inner Mongolia of China. Compared with the existing and traditional prediction methods, the normalized root mean square error of the proposed method is reduced by 1.13% -2.15%, which verifies the effectiveness of the proposed method. © 2010-2012 IEEE.

关键词： Mean square error

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Pueraria: A Comprehensive Review of Chemical Composition, Health Benefits, and Current Applications

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Comprehensive Reviews in Food Science and Food Safety 2025年第3期24卷 e70177页

作者： Wu, Qiong Chen, Kai Ma, Long Man, Shuli State Key Laboratory of Food Nutrition and Safety Key Laboratory of Industrial Microbiology Ministry of Education Tianjin Key Laboratory of Industry Microbiology National and Local United Engineering Lab of Metabolic Control Fermentation Technology China International Science and Technology Cooperation Base of Food Nutrition/Safety and Medicinal Chemistry College of Biotechnology Tianjin University of Science and Technology Tianjin China The Innovation Institute of Agricultural Technology College of Life Science Shangrao Normal University Shangrao China

Pueraria as a legume vine is mainly produced in East Asia and Southeast Asia. Its most widely used part is the tuber. Pueraria is often used to treat various diseases such as fever and headache since ancient times. Recently, pueraria as a valuable source of polysaccharides, phytochemicals, proteins, minerals, and other nutrients has anticancer, immunomodulatory, hypoglycemic, lipid-lowering, antiatherosclerotic, neuroprotective, hepatointestinal regulatory, hormonal regulatory activities, and so forth. This review provides a comprehensive overview of the resources and distribution, processing procedures and application, nutritional and phytochemical composition, and biological activities of pueraria, and gives insights into developing pueraria as a potential and novel ingredient for its versatile food and nonfood applications along with the latest researches conducted worldwide. Furthermore, it highlights the safety and regulatory issues for consumption of pueraria as food ingredient. © 2025 institute of Food Technologists®.

关键词： Bioactivity

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Design and demonstration of a dynamic wireless power transfer system for electric vehicles

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Science China(Information Sciences) 2019年第12期62卷 223-241页

作者： Ze ZHOU Liyan ZHANG Zhitao LIU Longhua MA Miao HUANG Hongye SU School of Automation Wuhan University of Technology State Key Laboratory of Industrial Control Technology Institute of Cyber-Systems and ControlZhejiang University Ningbo Institute of Technology Zhejiang University

The usage of electric vehicles is being globally promoted with the development of clean energy. However, the development of electric vehicles is limited by the battery capacity and the charging tech-

关键词： cycle Design and demonstration of a dynamic wireless power transfer system for electric vehicles

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