检索结果-内蒙古大学图书馆

Energy, Electrical and Power engineering (CEEPE), International Conference on

作者： Yongle Zhong Xinhua He Zhizhe Wang Jun Luo Bin Wang Qiushuang Li School of Materials Science and Engineering South China University of Technology Guangzhou China Science and Technology on Reliability Physics and Application of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China Electronic Component Inspection and Testing Center China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China Guangzhou Wide Bandgap Semiconductor Innovation Center Guangzhou Institute of Technology Xidian University Guangzhou China

ISBN: (数字)9798350375794

ISBN: (纸本)9798350375800

A comprehensive review of High-Temperature Gate Bias (HTGB) and High-Temperature Reverse Bias (HTRB) reliability in Silicon Carbide Metal-Oxide-Semiconductor Field-Effect Transistors (SiC MOSFETs) was made in this paper. Despite the considerable potential of high power, high voltage, high frequency, and radiation resistance for SiC MOSFETs, the challenge in long-term reliability has limited the application in high-frequency and high-temperature fields. As an effective method to assess long-term reliability of SiC MOSFETs, HTGB and HTRB testing have been widely applied for commercial SiC MOSFETs. The research on the reliability of SiC MOSFETs under HTGB and HTRB has been comprehensively reviewed in this paper, with a focus on the test conditions, deterioration laws of key parameters, and failure mechanisms. This review may serve as a valuable reference for subsequent research on SiC MOSFETs.

关键词： Resistance MOSFET Silicon carbide Reviews Failure analysis High-voltage techniques Logic gates

来源：评论

学校读者我要写书评

暂无评论

Proton Range Verification Realized via a Multi-Slit Prompt Gamma Imaging System

引用

IEEE Transactions on Radiation and Plasma Medical sciences 2025年

作者： Zhang, Hongyang Zhao, Bo Fan, Peng Wang, Shi Lu, Wenzhuo Yu, Yancheng Wu, Zhaoxia Ma, Tianyu Liu, Hui Liu, Yaqiang Ministry of Education Department of Engineering Physics Tsinghua University Beijing100084 China 4-9-1 Anagawa Institute for Quantum Medical Science QST Department of Accelerator and Medical Physics Inage-ku Chiba263-8555 Japan Beijing Institute of Spacecraft Environment Engineering China Academy of Space Technology and Science and Technology on Reliability and Environmental Engineering Laboratory Beijing Institute of Spacecraft Environment Engineering Beijing100094 China

Proton therapy is one of the most advanced radiotherapy techniques. Despite its advantages in dose delivery, it has not yet achieved significant clinical benefits for patients due to uncertainties in proton range. Accurate, real-time monitoring of proton dose and range is crucial for ensuring the precision of proton therapy. In prior work, a dual-head prompt gamma imaging system was proposed and evaluated through Monte Carlo simulations, demonstrating high spatial resolution and sufficient detection efficiency for proton pencil beam imaging at clinical doses. This study focuses on the assembly, calibration, and testing of one of the detectors in this system. Spatial resolution and detection efficiency were evaluated using a 22Na point source, while range shift detection and accuracy were assessed with 60 and 100 MeV proton beams under low proton count conditions. The single-head system achieved a detection efficiency of 0.22% and a full-width at half-maximum (FWHM) spatial resolution of 2.8 mm at the center of the field of view (FOV). The system was able to detect a 1 mm range shift by identifying the most distal edge position (MDEP) of the prompt gamma profile. The detector demonstrated a range accuracy of less than 1 mm at typical count levels for a single spot in proton pencil beam scanning. The results suggest that this system performs well in terms of both detection efficiency and spatial resolution, and the system could achieve real-time range verification with high accuracy. © 2017 IEEE.

关键词： Proton beam therapy

来源：评论

学校读者我要写书评

暂无评论

Nodal Chain Semimetal Co2mnga: A Magnetic Catalyst with Topological Significance

SSRN

引用

SSRN 2023年

作者： Zhang, Xiaoming He, Zeqing Wang, Lirong Liu, Ying Li, Zihan Dai, Xuefang Liu, Guodong State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin300130 China School of Materials Science and Engineering Hebei University of Technology Tianjin300130 China

Topological catalysis has become a major topic in electrochemical catalysis due to its outstanding performance in electrochemical reactions. Recently, a universal catalytic descriptor, known as topological surface states (TSS), has been proposed to describe catalytic performance in several nonmagnetic topological catalysts [Mater. Today 67, 23 (2023)]. However, the universality of this descriptor still lacks experimental evidence and has not been verified in magnetic topological catalysts yet. In this study, we investigate the catalytic performance and topological properties of the magnetic material Co2MnGa, which is a representative topological nodal chain semimetal with both theoretical and experimental validation. Our experimental findings demonstrate that Co2MnGa exhibits excellent catalytic performance in the hydrogen evolution reaction (HER). Our research reveals the presence of TSS from the nodal chain state is responsible for the high catalytic activity in Co2MnGa. Further, a direct relationship between the strength of TSS and Gibbs free energy can be built in the system. This comprehensive study has expanded our understanding of topological catalysts by exploring their material properties and corresponding topological mechanisms, extending our knowledge from nonmagnetic to magnetic categories. © 2023, The Authors. All rights reserved.

关键词： Topology

来源：评论

学校读者我要写书评

暂无评论

3D printing of (Cf-Csf)/ZrB2-SiC composites through coextrusion of flexible pre-infiltrated Cf/ZrB2 fiber bundle and Csf/ZrB2 paste

引用

Ceramics International 2025年

作者： Zhang, Yixin Cheng, Yehong Fang, Jinming Ma, Denghao Sun, Xin Li, Junping An, Yumin Hu, Ning Zhao, Libin School of Mechanical Engineering Hebei University of Technology Tianjin300401 China Ministry of Education Tianjin300401 China Key Laboratory of Hebei Province on Scale-span Intelligent Equipment Technology Tianjin300401 China Chongqing Science Innovation Center Hebei University of Technology Chongqing401135 China Science and Technology of Advanced Functional Composite Materials Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing100076 China State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of Technology Tianjin300401 China

This work addresses two major challenges in 3D printed ceramic composites: inadequate ceramic matrix infiltration in fiber bundles and the lack of optimized fiber-matrix interfaces. We developed a breakthrough fabrication strategy featuring: A tailored flexible carbon coating specifically designed for 3D printing applications, deposited on carbon fibers to create a suitable interface;A specialized pre-infiltration method enabling uniform ceramic slurry distribution in continuous carbon fiber bundles;and A unique co-extrusion process combining flexible pre-infiltrated Cf/ZrB2 bundles with Csf/ZrB2 paste. The resulting (Cf-Csf)/ZrB2-SiC composites, fabricated through multi-cycle precursor infiltration-pyrolysis, demonstrate remarkable mechanical properties (flexural strength: 237.6 MPa;fracture toughness: 7.30 MPa m1/2) and exceptional ablation resistance (enduring 2190 °C surface temperatures for 1320 s in wind tunnel testing). This work establishes a new paradigm for manufacturing ultra-high temperature ceramic composites with simultaneously enhanced mechanical and thermal performance. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Fracture toughness

来源：评论

学校读者我要写书评

暂无评论

Theoretical realization of two-dimensional half-metallicity and fully spin-polarized multiple nodal-line fermions in monolayer PrOBr

引用

Physical Review B 2022年第7期105卷 075414-075414页

作者： Lei Jin Xiaoming Zhang Ying Liu Xuefang Dai Guodong Liu State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China School of Materials Science and Engineering Hebei University of Technology Tianjin 300130 China

Two-dimensional (2D) half metallicity and topological aspects of matter are the focus of current research because of the promising applications in nanoscale spintronics and quantum electronics. In this work, we report the perfect combination of half-metallic properties and electronic topological properties in single 2D phase, namely, the PrOBr monolayer. The material only possesses conducting electrons in the spin-up channel, while it shows a large insulating gap of 3.5 eV in the spin-down channel with the Curie temperature as high as 423 K. In the conducting spin channel, it exhibits multiple band crossings, which can surprisingly realize the coexistence of fully spin-polarized open/closed, and type-I/type-II/hybrid-type nodal lines. The coexistence of so many nodal line states has been neither identified in 2D materials nor identified in half metals before. The protection mechanism, the spin-orbit coupling impact, and the effective models for the nodal lines have been clarified. Our results suggest that the PrOBr monolayer is a good electronic material with (i) 2D half metallicity; (ii) multiple nodal lines of 100% spin polarization.

关键词： Edge states Ferromagnetism First-principles calculations Spin polarization Symmetry protected topological states Topological materials

来源：评论

学校读者我要写书评

暂无评论

The Effects of RF Power and Cavity Structure on the Plasma Discharge Characteristics of RPS

The Effects of RF Power and Cavity Structure on the Plasma D...

引用

Electronics and Devices, Computational science (ICEDCS), International Conference on

作者： Hai Lin Wei Su Ming Chen Renhuai Liu School of Mechanics and Construction Engineering Jinan University Guangzhou China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key Lab of Disaster Forecast and Control in Engineering Guangzhou China

In this paper, a two-dimensional model of plasma diffusion in remote plasma source discharge chamber is established by COMSOL plasma module. The electron density and electron temperature distributions inside the discharge cavity were obtained by adjusting the thickness of alumina coating and the magnitude of RF power parameters. Based on the results, the authors discuss the effects of different alumina coating thickness and RF power on the electron density and electron temperature inside the discharge cavity, which provide theoretical guidance for the subsequent optimization of the internal structure of the discharge cavity and the discharge parameters.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A PARAMETRIC STUDY ON THE DEVELOPMENT OF WHEEL POLYGONIZATION 12

A PARAMETRIC STUDY ON THE DEVELOPMENT OF WHEEL POLYGONIZATIO...

引用

12th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, CM 2022

作者： Cai, Wubin Chi, Maoru Wu, Xingwen Jin, Xuesong Liang, Shulin Huang, Hong-Zhong State Key Laboratory of Traction Power Southwest Jiaotong University Chengdu610031 China Center for System Reliability and Safety University of Electronic Science and Technology of China Chengdu611731 China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China Chengdu611731 China School of Mechanical Engineering Southwest Jiaotong University Chengdu610031 China

ISBN: (纸本)9780646865881

Two numerical vehicle/track dynamic models: a simplified linear model and a comprehensive nonlinear model are developed for studying the wheel polygonal wear in the frequency domain and the time domain respectively. Rail localized bending modes are identified to be the triggers of high-order polygonal wear, while the wheelset flexible resonance has little influence on the development of high-order polygonal wear. The initial wheel flat can promote the growth of high-order polygonal wear along the flat. The residual high-order polygonal wear after re-profiling will significantly accelerate the development rate of polygonal wear on adjacent wheel. © 2022 CM 2022 - 12th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, Conference Proceedings. All rights reserved.

关键词： Frequency domain analysis

来源：评论

学校读者我要写书评

暂无评论

Investigation on the Degradation Mechanism of A1GaN/GaN HEMTs Under the Effect of Microwave Pulses at Different Powers

Investigation on the Degradation Mechanism of A1GaN/GaN HEMT...

引用

Prognostics and System Health Management Conference (PHM-Qingdao)

作者： Fanfeng Yang Min Liao Binjian Zeng Peiliang Yang Yiqiang Chen College of Materials Science and Engineering Xiangtan University Xiangtan China The Science and Technology on Reliability Physics and Application of Electronic Component Laboratory The No.5 Electronics Research Institute of the Ministry of Industry and Information Technology Guangzhou China

We have investigated the effect of microwave pulse stress of different powers on A1GaN/GaN HEMTs. The dc characteristics of the devices were first scrutinized. The results indicate that the electrical characteristics of the devices are degraded after stress. The saturation drain-source current decreases from 681.8 mA to 246.5 mA, a decrease of 63.8 63.8%, at the power 40 dBm. And at the power 45 dBm, the saturation drain-source current drops even more, from 662.3 mA to 176.7 mA, a drop of 73.3 73.3%. The stress results in significant positive drift of threshold voltage and decrease of gate leakage current. And the degradation is more obvious with increasing microwave pulses power. Then, the internal defects of the device are characterized by low-frequency noise method, and the mechanism of device degradation is discussed. At the power of 45 dBm, the internal defect density of the device doubles, resulting in more electrons being captured at the channel. This is useful for the reliability level of future devices and practical applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Intelligent Fault Diagnosis of Engine Bolt Tightening Based on One-dimensional Convolutional Neural Network 12

Intelligent Fault Diagnosis of Engine Bolt Tightening Based ...

引用

12th IEEE Global reliability and Prognostics and Health Management, PHM-Nanjing 2021

作者： Wang, Chao Wang, Yuanhang Wu, Jun Xu, Xuebing Li, Xiaoting Huazhong University Of Science And Technology School Of Naval Architecture And Ocean Engineering Wuhan China Guangdong Provincial Key Laboratory Of Electronic Information Products Reliability Technology Guangzhou China

ISBN: (纸本)9781665401302

Threaded connection is one of the most widely used connection methods in automobile manufacturing industry. The quality of thread connection is directly related to the life safety. With the development of tightening technology and the improvement of tightening equipment manufacturing level. As a method to record the dynamic changes of tightening process, tightening curve technology has been relatively mature. However, it is extremely difficult to identify the failure of tightening process in real time with human experience. In this paper, an intelligent fault diagnosis method based on one-dimensional convolutional neural network (ID-CNN) is proposed, which can effectively reduce the false positive and false negative caused by manual recognition. Experimental results show that the fault diagnosis accuracy is over 98%. © 2021 IEEE.

关键词： Convolutional neural networks

来源：评论

学校读者我要写书评

暂无评论

Curvature Interference Characteristic of Plane Worm Gear in Offsetting Cylindrical Worm Drive 13th

Curvature Interference Characteristic of Plane Worm Gear in ...

引用

13th International Conference on the Theory of Machines and Mechanisms, TMM 2020

作者： Meng, Qingxiang Zhao, Yaping Cui, Jian Li, Gongfa School of Mechanical Engineering and Automation Northeastern University Shenyang110819 China Key Laboratory of Dynamics Reliability of Mechanical Equipment Northeastern University Liaoning Shenyang110819 China Key Laboratory of Metallurgical Equipment and Control of Ministry of Education Wuhan University of Science and Technology Wuhan430081 China

ISBN: (纸本)9783030835934

In this paper, the theory of the curvature interference characteristic is well established for the plane worm gear in the offsetting cylindrical worm drive. The offsetting cylindrical worm drive investigated in this paper is composed of an Archimedes cylindrical worm having the asymmetric tooth profile and a plane worm gear. The equations of the tooth surfaces, the meshing function, the meshing limit function, and the curvature interference limit function are all obtained for the worm drive. In accordance with the geometric construction and the elimination method, the first type of limit point on the curvature interference limit line is determined by iteratively solving the established nonlinear equation set. The result of the numerical case demonstrates that the curvature interference limit line on the worm gear tooth surface and its conjugate line on the worm helicoid are all located out the meshing zone of the worm drive. The meshing zones of the worm drive are located on the non-undercutting side. The part most likely to be undercut for the plane worm gear is located at the tooth root of the toe of its concave surface. © 2022, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Nonlinear equations

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：