检索结果-内蒙古大学图书馆

Near-infrared responsive polycaprolactone coatings for magnesium implants: Photodynamic antibacterial and controllable dissolution

引用

Journal of Magnesium and Alloys 2025年第4期13卷 1671-1684页

作者： Liu, Xi Pan, Jinglong Lv, You Wang, Xu Ma, Xiaoze Zhang, Xinxin Cai, Guangyi Dong, Zehua Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun130022 China National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan430033 China

Magnesium implants have received widespread attention in orthopaedic surgery. However, the mechanical degradation and concurrent inflammation caused by the rapid corrosion of Mg limits their applications. In this study, a kind of unique core-shell heterojunction CuS@PPy nanostructures was synthesized and then incorporated in polycaprolactone (PCL) to construct an intelligent coating (CuS@PPy/PCL) on micro-arc-oxidized Mg implants. The PCL-based coating can realize near-infrared (NIR)-driven antibacterial and controllable Mg dissolution according to different bone healing stages. At the beginning of bone remodelling, the coating exhibits promising antibacterial properties with 99.67% and 99.17% efficacy against S. aureus and E. coli, respectively, thanks to the singlet oxygen (1O2) and alkoxyl radicals (RO·) generated by the photodynamic effect of CuS@PPy heterojunction under low-power NIR light (1.5 W/cm2). In the bone reparative stage, the PCL-based coating can maintain high corrosion resistance to meet the mechanical requirements of Mg implants in human body fluid. However, after the complete rehabilitation of bones, through a high-power (2 W/cm2) NIR light, the PCL-based coating changed from an elastic to a viscous flow state (44.7 °C) under the photothermal effects of CuS@PPy, leading to quick degradation of the PCL-based coating and following accelerating dissolution of the Mg implant (avoiding secondary surgery). Hopefully, this NIR-responsive coating may provide an innovative method for the antibacterial and controllable dissolution of Mg implants. © 2024

关键词： Corrosion resistance

来源：评论

学校读者我要写书评

暂无评论

Investigation on influence of gamma irradiation on piezoelectric and resonance characteristics of surface acoustic wave resonators 5

Investigation on influence of gamma irradiation on piezoelec...

引用

5th International Conference on Mechanical Engineering and Materials, ICMEM 2024

作者： Sun, Lei Peng, Bin Yang, Yuntao Sun, Zhaofeng Zhu, Jialiang Zhang, Wanli State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (数字)9781510688971

ISBN: (纸本)9781510688964

In this work, an evaluation towards influence of high-dose gamma irradiation on surface acoustic wave (SAW) resonators, is reported. The single-port SAW resonators are fabricated using Lithium niobate (LiNbO3) and Catangasite (CTGS, Ca3TaGa3Si2O14) substrates, along respective cut directions of (0º, 38º, 0º) and (0º, 90º, 0º). Piezoelectric coefficient of substrates, and several main resonance parameters covering resonance frequency, amplitude of resonance peak in reflection coefficient, quality factor together with electromechanical coupling factor of manufactured SAW resonators are investigated, as suitable representatives of piezoelectric and resonance characteristics of SAW resonators. After exposure to gamma ray with a maximum dose of 250 kGy, substrates show insignificant variation not exceeding 6% in their piezoelectric coefficient. Meanwhile, resonance parameters of SAW resonators also alter slightly. Such excellent stability of these characteristics demonstrates credible irradiation hardness owned by both SAW resonators. Results in this study can provide supportive references for usage of LiNbO3 and CTGS-based SAW devices in harsh environments. © 2025 SPIE.

关键词： Gamma rays

来源：评论

学校读者我要写书评

暂无评论

Compact 2-D Passive Beam Scanning Multi-Beam Antenna Based on Rotman Lens and Mechanical Sweeping Phase Gradient Metasurface

引用

IEEE Transactions on Antennas and Propagation 2025年

作者： Cao, Yuanxi Wu, Sifan Zhang, Jiahao Li, Jianxing Yan, Sen Xi'an Jiaotong University School of Information and Communications Engineering Xi'an710049 China Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan430033 China

A compact multi-beam antenna is proposed with passive 2-D beam scanning capability. The antenna is composed of a Rotman lens beamformer, a slotted waveguide array (SWA), and a mechanical sweeping phase gradient metasurface (PGM). The Rotman lens and the PGM together provide a wide range of scanning angles, enabling 2-D beam steering. To improve the crossover level (COL) and the sidelobe level (SLL) of the beams steered by the Rotman lens, the technology of dual sources excitation (DSE) is used, optimizing the COL and the SLL by the tapered magnitude distribution from the sources. Numerical analysis and full-wave simulation are used to verify the performance variations with different source aperture sizes. Since the SWA array can generate a quasi-plane wave above its aperture, the PGM can be fitted close to the SWAs with low spillover loss, resulting in a low antenna profile ( © 2025 IEEE.

关键词： Scanning antennas

来源：评论

学校读者我要写书评

暂无评论

A Valuable and Low-Budget Process Scheme of Equivalized 1 nm technology Node Based on 2D Materials

引用

Nano-Micro Letters 2025年第8期17卷 294-305页

作者： Yang Shen Zhejia Zhang Zhujun Yao Mengge Jin Jintian Gao Yuhan Zhao Wenzhong Bao Yabin Sun He Tian College of Integrated Circuit Science and Engineering Shanghai Key Laboratory of Multidimensional Information ProcessingEast China Normal UniversityShanghai 200241People’s Republic of China Institute of Microelectronics and Beijing National Research Center for Information Science and Technology(BNRist) Tsinghua UniversityBeijing 100084People’s Republic of China State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433People’s Republic of China Shaoxin Laboratory Shaoxing 312000People’s Republic of China

Emerging two-dimensional(2D)semiconductors are among the most promising materials for ultra-scaled transistors due to their intrinsic atomic-level *** the stacking process advances,the complexity and cost of nanosheet field-effect transistors(NSFETs)and complementary FET(CFET)continue to *** 1 nm technology node is going to be based on Si-CFET process according to international roadmap for devices and systems(IRDS)(2022,https://***/),but not publicly confirmed,indicating that more possibilities still *** miniaturization advantage of 2D semiconductors motivates us to explore their potential for reducing process costs while matching the performance of next-generation nodes in terms of area,power consumption and *** this study,a comprehensive framework is built.A set of MoS2 NSFETs were designed and fabricated to extract the key parameters and *** then for benchmarking,the sizes of 2D-NSFET are scaled to a extent that both of the Si-CFET and 2D-NSFET have the same average device *** these conditions,the frequency of ultra-scaled 2D-NSFET is found to improve by 36%at a fixed power *** work verifies the feasibility of replacing silicon-based CFETs of 1 nm node with 2D-NSFETs and proposes a 2D technology solution for 1 nm nodes,i.e.,“2D eq 1 nm”*** the same time,thanks to the lower characteristic length of 2D semiconductors,the miniaturized 2D-NSFET achieves a 28%frequency increase at a fixed power ***,developing a standard cell library,these devices obtain a similar trend in 16-bit RISC-V *** work quantifies and highlights the advantages of 2D semiconductors in advanced nodes,offering new possibilities for the application of 2D semiconductors in high-speed and low-power integrated circuits.

关键词： Two-dimensional semiconductors 1 nm technology node Nanosheet field-effect transistors Complementary field-effect transistors Horizontal scaling

来源：评论

学校读者我要写书评

暂无评论

Enhancing IC substrate manufacturing through differential geometry and lightweight networks for etching defect detection

引用

Journal of Manufacturing systems 2025年 80卷 902-915页

作者： Yu, Yongxing Huang, Dan Hu, Yueming School of Automation Science and Engineering South China University of Technology Guangzhou510641 China Engineering Research Center of Precision Electronic Manufacturing Equipment Ministry of Education and Guangdong Provincial Engineering Laboratory for Advanced Chip Intelligent Packaging Equipment South China University of Technology Guangzhou510641 China Department of Automation North China Electric Power University Baoding071003 China Baoding key Laboratory of State Detection and Optimization Regulation for Integrated Energy System North China Electric Power University Baoding071003 China

With the advancement of high-density interconnect technology in semiconductor manufacturing, the precision and complexity of integrated circuit (IC) substrates have significantly increased, placing higher demands on quality control. Efficient and accurate detection of complex etching defects, which often occur during manufacturing, has become critical to preventing potential product defects. A defect detection method is proposed that combines a lightweight network with differential geometry tools to address the issue of etching defects in IC substrates. First, an improved deformable model is used to rapidly extract regular circuit trace contours from complex metallographic images, and morphological processing is applied to enhance the details, achieving precise image segmentation. For under-etching defects between circuit traces, differential processing of the original and segmented images is performed to locate abnormal regions. Subsequently, an optimized lightweight network based on MobileNet, termed OMNet, is designed to achieve the rapid identification of under-etching defects in these regions. For etching defects occurring on circuit traces, the DGEtch method employs a high-precision discrete curvature calculation based on the Frenet frame to evaluate angular discontinuities in contours, enabling accurate detection of etching defects. Experimental results demonstrate that the proposed method achieves an average recall rate of over 95% and maintains a precision above 90%. It exhibits high accuracy and stability in detecting etching defects and consistently outperforms existing models, particularly in handling complex mixed defects. This study provides an effective solution for detecting complicated defects in high-density IC substrate manufacturing. © 2025 The Society of Manufacturing Engineers

关键词： Inspection

来源：评论

学校读者我要写书评

暂无评论

Enhanced Adaptive Disturbance Observer for Sensorless Control of PMSM With Multi-harmonics Suppression Characteristics

引用

IEEE Journal of Emerging and Selected Topics in power Electronics 2025年

作者： Qin, Qinghai Yi, Xinqiang Yu, Zhongjun Yu, Haitao Fang, Shuhua Southeast University School of Electrical Engineering Nanjing210096 China Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan430033 China East Lake Laboratory Wuhan430202 China

The inverter nonlinearity and spatial flux harmonics inevitably result in the back electromotive force (BEMF) harmonics in permanent magnet synchronous motor (PMSM), which deteriorates the performance of the model-based sensorless control. To settle the problem, this article proposes an enhanced adaptive disturbance observer by reconstructing the observer structure based on the pre-designed enhanced complex coefficient filter (ECCF). An ECCF with specific harmonic filtering capability based on conventional complex coefficient filter and multi-frequency suppression module is pre-constructed. Based on the reverse design method, the structure of the conventional disturbance observer is reconstructed into the desired ECCF structure. Multi-harmonics can be suppressed without cascading additional filtering networks after the conventional BEMF observers. The sensorless control algorithm studied is verified by the comparative experiments on a 1 kW PMSM platform. © 2013 IEEE.

关键词： Sensorless control

来源：评论

学校读者我要写书评

暂无评论

Big-data-driven vessel destination prediction for smart port management

引用

Engineering Applications of Artificial Intelligence 2025年 154卷

作者： Chen, Jin Zhang, Qiang Liang, Maohan Peng, Chang Chen, Chen Sanya Institute Hunan University of Science and Technology China National Key Laboratory of Space Integrated Information System China Hubei Key Laboratory of Inland Shipping Technology School of Navigation Wuhan University of Technology China Department of Civil and Environmental Engineering National University of Singapore Singapore College of Computer Science and Electronic Engineering Hunan University China

The accurate prediction of vessel destinations is crucial for enhancing maritime traffic efficiency, optimizing port management, and improving regional economic analysis. However, destination information in Automatic Identification system (AIS) data is often missing or inaccurate, which undermines the reliability of maritime analytic. Traditional vessel destination prediction methods primarily focus on measuring trajectory similarities, which results in high computational complexity. This study develops a deep learning approach to vessel destination prediction by transforming the problem into an image classification task. Rasterized images of historical destination ports and vessel trajectories are generated, incorporating AIS data within a fixed spatial context. A multi-scale residual convolutional network is constructed to extract relevant trajectory and port distribution features. To enhance the representation of trajectory endpoints, which are critical for predicting the destination port, a multi-attention mechanism is introduced. This mechanism increases the learning weight assigned to endpoint features, improving prediction accuracy. Finally, a classification network predicts the destination port based on the extracted features. The performance of the proposed method is evaluated using AIS data from the Denmark Strait. Experimental results demonstrate that the model outperforms existing methods, highlighting its potential for applications in smart port management and maritime traffic optimization. © 2025 Elsevier Ltd

关键词： Waterway transportation

来源：评论

学校读者我要写书评

暂无评论

Inertia Transmission Control of Full-power Converter Variable-Speed Pumped Storage system for Grid Frequency Support

引用

IEEE Transactions on Sustainable Energy 2025年

作者： Chuang, Kaihsun Tao, Xiongfei Luan, Yihang Peng, Minxuan Sun, Jianjun Zha, Xiaoming Wuhan University Hubei Key Laboratory of Power Equipment and System Security for Integrated Energy The School of Electrical Engineering and Automation Wuhan430072 China Huazhong University of Science and Technology School of Integrated Circuit Wuhan430074 China

Full-power converter variable-speed pumped storage (FPC-VSPS) is a promising technique for flexible power regulation in small-scale distributed hydroelectric power plants. However, conventional vector control limits the synchronous motor of the FPC-VSPS from providing inertia support to the power grid. To overcome this limitation, this paper introduces an inertia transmission control for FPC-VSPS based on the concept of DC voltage synchronization. Firstly, the control incorporates the DC capacitor power equation into the GSC control. To enable inertia transmission from the FPC-VSPS synchronous machine, the DC capacitor dynamics are fed into both the speed and torque control of the MSC. Secondly, a torsion spring-rigid body equivalent model is introduced based on the inertia transmission process, analyzing the effects of physical parameters, control coefficients, and transmission delays on the inertia transmission performance. Theoretical analysis and simulation results reveal that the inherent physical differences and transmission delay have a negative impact on the effectiveness of the inertia transmission. Consequently, a DC capacitor design method based on inertia matching is proposed, accounting for the constraints of physical inertia matching, system stability, and operational security. Finally, simulations and experiments prove the necessity of inertia matching and verify the effectiveness of the proposed control to cope with frequency fluctuations in both pumping and generating modes. © 2010-2012 IEEE.

关键词： Vector control (Electric machinery)

来源：评论

学校读者我要写书评

暂无评论

An Asymmetric Arc-Shaped Coupler–Based WPT Design for High Misalignment Tolerance Charging of AUVs

引用

International Journal of Circuit Theory and Applications 2025年第0期

作者： Deng, Shuming Cai, Changsong Wang, Junhua Jiang, Yufeng Zhang, Xian Wan, Leke Wu, Xi Du, Yinfeng Zhou, Yingguo Hubei Key Laboratory of Power Equipment & System Security for Integrated Energy School of Electrical Engineering and Automation Wuhan University Hubei Wuhan China State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin China School of Materials Science and Engineering Jiangsu University of Science and Technology Zhenjiang China

In contact with a wide area of seawater, the use of a typical planar coil structure generates the problem of large fluctuations of the overall efficiency and power when the system encounters environmental disturbances. In order to improve the misalignment tolerance of the system, this article proposes a high misalignment tolerance WPT system with constant current output based on the asymmetric arc-shaped coupler and LCC-P compensation topology. This design effectively increases the horizontal and rotation misalignment tolerance, so that the fluctuation of the overall efficiency and power of the system greatly declines when coming across disturbances. The article firstly establishes the equivalent circuit model and deduces the equations about parameter configuration and the output characteristics of the system. Furthermore, the asymmetric arc-shaped coupler is designed, and the mutual inductance fluctuation of the coupler is verified to be within 8.7% through simulation. Finally, a 500-W-level experimental prototype based on the WPT design is built and tested to verify the performance and effectiveness. The prototype achieves stable performance with an output power about 580 W and an 85% overall efficiency when the horizontal misalignment distance varies from 0 to 40 mm and the misalignment angle varies from 0 to 35°. © 2025 John Wiley & Sons Ltd.

关键词： Autonomous underwater vehicles

来源：评论

学校读者我要写书评

暂无评论

Periodic orbit model of diode rectifiers-synchronous machine system

引用

science China(Technological sciences) 2013年第1期56卷 245-252页

作者： WANG Gang FU LiJun FAN XueXin YE ZhiHao MA Fan National Key Laboratory for Vessel Integrated Power System Technology

Diode rectifiers-synchronous machine system has a wide range of applications in isolated power system,whose low frequency oscillation emerges under certain *** error is produced when the state space averaging model is used to analyze its small signal ***,this paper has presented a periodic orbit model of diode rectifiers-synchronous machine system to solve these *** trapezoidal integration method,it is possible to derive equation of periodic orbit and its Poincaré *** matrix of the Poincaré mapping of periodic orbit can be calculated by chain derivative ***,stability margin index and linearized Poincaré mapping model have also been *** small signal stability of diode rectifiers-synchronous machine system can be assessed through orbitally asymptotical stability of its periodic orbit so as to lay a foundation for isolated power system analysis and its control *** test demonstrates that the proposed model and algorithm are effective and practicable.

关键词： power system diode rectifiers-synchronous machine system small signal stability modeling periodic orbit

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：