检索结果-内蒙古大学图书馆

International Conference on electrical Machines and Systems (ICEMS)

作者： Yiyang Li Xin Gu Zhiqiang Wang Liyan Guo Wei Chen Xinmin Li Chen Li School of Electronics and Information Engineering Tiangong University Tianjin China Tianjin Key Laboratory of Intelligent Control of Electrical Equipment Tianjin China School of Electrical Engineering Tiangong University Tianjin China National Local Joint Engineering Research Center of Electrical Machine System Design and Manufacturing China Zhejiang University Advanced Electrical Equipment Innovation Center Hangzhou China

ISBN: (数字)9784886864406

ISBN: (纸本)9798350379105

Even if the exact motor parameters are known, the MTPA strategy cannot obtain precise maximum torque per ampere (MTPA) points under large current amplitude because the partial derivative of inductance to current is ignored in the modeling process. In view of this, the MTPA mathematical model considering the partial derivative of inductance to current is established in this paper, and the MTPA point tracking error caused by ignoring the partial derivative in the modeling process based on Ferrari method is analyzed. Then, an offline-online combined method for calculating the partial derivative term is proposed to compensate the MTPA tracking error. On this basis, an MTPA control strategy based on Ferrari method considering the partial derivative of inductance to current is proposed. Experiment to verify the feasibility and effectiveness of the proposed method.

关键词： Inductance Analytical models Torque Accuracy Permanent magnet motors Mathematical models Trajectory

来源：评论

学校读者我要写书评

暂无评论

Comparative analysis of CM EMI for boost converter using Si/SiC hybrid switch 1

Comparative analysis of CM EMI for boost converter using Si/...

引用

1st IEEE China International Youth Conference on electrical engineering, CIYCEE 2020

作者： Hu, Bo Peng, Zishun Xiao, Pei Dai, Yuxing Zhang, Chao Wang, Jun Hunan University College of Electrical and Information Engineering China Wenzhou University National-Local Joint Engineering Laboratory of Digitalize Electrical Design Technology China

ISBN: (纸本)9781728196596

The combination of the Si IGBT and SiC MOSFET inside the Si/SiC hybrid switch will bring serious conducted electromagnetic interference (EMI) noise in the application of the power converters. Compared with the differential mode (DM) EMI noise, the common mode (CM) EMI noise has a greater impact on the total conducted EMI noise, and it is relatively difficult to suppress the common mode EMI noise. However, there is still lack of research on the CM EMI emission characteristics of Si/SiC hybrid switch based converters. In this paper, the CM EMI noise caused by the Si/SiC hybrid switch, Si IGBT, and SiC MOSFET are compared at first. Then, the influence of different current ratios of the Si/SiC hybrid switch on the CM EMI is analyzed. © 2020 IEEE.

关键词： Silicon carbide

来源：评论

学校读者我要写书评

暂无评论

Parallel type based on Si-IGBT and SiC-MOSFET inverter Research on Multifunctional Power Supply 1

Parallel type based on Si-IGBT and SiC-MOSFET inverter Resea...

引用

1st IEEE International Power Electronics and Application Symposium, PEAS 2021

作者： Liu, Shengyu Peng, Zishun Li, Li Zhao, Zhenxing Zhou, Weng Dai, Yuxing Wenzhou University National-Local Joint Engineering Laboratory of Digitalize Electrical Design Technology Wenzhou China Zhejiang CHINT Electrics Co Ltd Electrical Research Institute Yueqing China Hunan Institute of Engineering College of Electrical And Information Engineering Xiangtan China Changsha Hitachi Electric Co Ltd Electrical Research Institute Changsha China

ISBN: (纸本)9781665413596

To improve the problem that the single power device inverter power supply cannot meet the requirements of power quality control under the new situation due to the poor high-frequency performance or high-cost limitation, this paper adopts the harmonic current frequency division control technology combined with the characteristics of Si IGBT and SiC MOSFET devices, and proposes a parallel multi-functional power supply scheme based on Si IGBT and SiC MOSFET inverters to compensate the harmonic current. The high-precision current tracking control is carried out through the fractional-order model predictive control, which improves the current control accuracy of the inverter power supply. The simulation and experimental results show that the scheme is safe, reliable and has various functions, and has a good ability of harmonic control and reactive power compensation. © 2021 IEEE.

关键词： Insulated gate bipolar transistors (IGBT)

来源：评论

学校读者我要写书评

暂无评论

A Fractional Order Model Predictive Control Method for Electric-Hydrogen Hybrid Energy Storage System

A Fractional Order Model Predictive Control Method for Elect...

引用

2021 China Automation Congress, CAC 2021

作者： Xu, Xiaofeng Peng, Zishun Li, Li Zhou, Wen Zhao, Zhenxing Dai, Yuxing National-local Joint Engineering Laboratory For Digitalize Electrical Design Technology Wenzhou University Wenzhou China Zhejiang CHINT Electrics Co. Ltd Yueqing China Changsha Sunye Electric Co. Ltd. Changsha China College of Electrical and Information Engineering Hunan Institute of Engineering Changsha China

ISBN: (纸本)9781665426473

A Fractional order model predictive control (FO-MPC) method for electric-hydrogen combined hybrid energy storage system is proposed in this paper. This method can help the converter of HESS to smooth the fluctuations of DG's output better, improve the control accuracy of the converter output current and improve the stability of DC microgrid. Firstly, the structure of electric-hydrogen combined HESS is illustrated and DC microgrid system is described. Secondly, the concept of fractional calculus is introduced and the predictive model of DC Converter based on fractional order differential equation is established. According to the predictive model, the next current state of bidirectional converter of battery-ultracapacitor and converter of electrolyzer and fuel cell is predicted precisely. Finally, the fractional order model predictive control approach is experimentally verified in Buck/Boost circuit and significantly reduce the current ripple on the DC bus of the microgrid. © 2021 IEEE

关键词： Model predictive control

来源：评论

学校读者我要写书评

暂无评论

Accurate Leukocyte Detection Based on Deformable-DETR and Multi-Level Feature Fusion for Aiding Diagnosis of Blood Diseases

arXiv

引用

arXiv 2024年

作者： Chen, Yifei Zhang, Chenyan Chen, Ben Huang, Yiyu Sun, Yifei Wang, Changmiao Fu, Xianjun Dai, Yuxing Qin, Feiwei Peng, Yong Gao, Yu HDU-ITMO Joint Institute Hangzhou Dianzi University Hangzhou310018 China Medical Big Data Lab Shenzhen Research Institute of Big Data Shenzhen518172 China School of Artificial Intelligence Zhejiang College of Security Technology Wenzhou325016 China National-local Joint Engineering Research Center for Digitalized Electrical Design Technology Wenzhou University Wenzhou325035 China School of Computer Science and Technology Hangzhou Dianzi University Hangzhou310018 China Department of Hematology Zhejiang Hospital Hangzhou310018 China

In standard hospital blood tests, the traditional process requires doctors to manually isolate leukocytes from microscopic images of patients’ blood using microscopes. These isolated leukocytes are then categorized via automatic leukocyte classifiers to determine the proportion and volume of different types of leukocytes present in the blood samples, aiding disease diagnosis. This methodology is not only time-consuming and labor-intensive, but it also has a high propensity for errors due to factors such as image quality and environmental conditions, which could potentially lead to incorrect subsequent classifications and misdiagnosis. Contemporary leukocyte detection methods exhibit limitations in dealing with images with fewer leukocyte features and the disparity in scale among different leukocytes, leading to unsatisfactory results in most instances. To address these issues, this paper proposes an innovative method of leukocyte detection: the Multi-level Feature Fusion and Deformable Self-attention DETR (MFDS-DETR). To tackle the issue of leukocyte scale disparity, we designed the High-level Screening-feature Fusion Pyramid (HS-FPN), enabling multi-level fusion. This model uses high-level features as weights to filter low-level feature information via a channel attention module and then merges the screened information with the high-level features, thus enhancing the model’s feature expression capability. Further, we address the issue of leukocyte feature scarcity by incorporating a multi-scale deformable self-attention module in the encoder and using the self-attention and cross-deformable attention mechanisms in the decoder, which aids in the extraction of the global features of the leukocyte feature maps. The effectiveness, superiority, and generalizability of the proposed MFDS-DETR method are confirmed through comparisons with other cutting-edge leukocyte detection models using the private WBCDD, public LISC and BCCD datasets. Our source code and private WBCCD

关键词： Object detection

来源：评论

学校读者我要写书评

暂无评论

Purification of hydrogen as green energy with pressure-vacuum swing adsorption (PVSA) with a two-layers adsorption bed using activated carbon and zeolite as adsorbent

引用

Chemosphere 2023年第1期338卷 139347页

作者： Xie, Xingyong Awad, Omar I. Xie, Lili Ge, Ziyi National & Local Joint Engineering Research Center for Mineral Salt Deep Utilization Huaiyin Institute of Technology Huaian223003 China Key Laboratory for Palygorskite Science and Applied Technology of Jiangsu Province Huaiyin Institute of Technology Huaian223003 China Mechanical Engineering Department College of Engineering Gulf University Bahrain Mechanical and Electrical Engineering College Hainan University Haikou570228 China

Today, hydrogen is produced in refineries and petrochemicals using the methane reforming process, followed by a water gas shift reaction stage. The hydrogen produced has a purity of approximately 75%, and is purified further through an adsorption process. In this project, the feasibility of achieving a purity level greater than 90% through the use of a more effective adsorbent and the periodic process of pressure vacuum swing adsorption (PVSA) with a double-layer bed of active carbon and zeolite will be investigated. The design, simulation, and optimization of the hydrogen purification unit will also be conducted. The results of this study indicate that the proposed process can achieve a purity level of up to 97% for the output hydrogen. © 2023

关键词： Activated carbon

来源：评论

学校读者我要写书评

暂无评论

Band offsets and electronic properties of the Ga_(2)O_(3)/FTO heterojunction via transfer of free-standing Ga_(2)O_(3) onto FTO/glass

引用

Chinese Physics B 2021年第11期30卷 385-388页

作者： Xia Wang Wei-Fang Gu Yong-Feng Qiao Zhi-Yong Feng Yue-Hua An Shao-Hui Zhang Zeng Liu Department of Electrical Engineering and Automation Shanxi Institute of TechnologyYangquan 045000China School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210023China National and Local Joint Engineering Laboratory for RF Integration and Micro-Packing Technologies Nanjing University of Posts and TelecommunicationsNanjing 210023China

The determination of band offsets is crucial in the optimization of Ga_(2)O_(3)-based devices,since the band alignment types could determine the operations of devices due to the restriction of carrier transport across the heterogeneous *** this work,the band offsets of the Ga_(2)O_(3)/FTO heterojunction are studied using x-ray photoelectron spectroscopy(XPS)based on Kraut’s method,which suggests a staggered type-II alignment with a conduction band offset(DEC)of 1.66 eV and a valence band offset(DEV)of􀀀2.41 ***,the electronic properties of the Ga_(2)O_(3)/FTO heterostructure are also measured,both in the dark and under ultraviolet(UV)illuminated conditions(254 nm UV light).Overall,this work can provide meaningful guidance for the design and construction of oxide hetero-structured devices based on wide-bandgap semiconducting Ga_(2)O_(3).

关键词： Ga_(2)O_(3)/FTO heterojunction band alignment magnetron sputtering free-standing

来源：评论

学校读者我要写书评

暂无评论

The design of Appropriate Si Content Overcomes the Strength-Ductility Trade-Off in Dual-Phase High Entropy Alloy

SSRN

引用

SSRN 2024年

作者： Wang, L.X. Xiang, Song Tan, Y.B. Shi, W. Liu, F. Cai, Y.Q. Ji, X.M. Guizhou Key Laboratory of Materials Mechanical Behavior and Microstructure College of Materials and Metallurgy Guizhou University Guiyang550025 China National & Local Joint Engineering Laboratory for High-Performance Metal Structure Material and Advanced Manufacturing Technology Guizhou University Guiyang550025 China School of Mechanical and Electrical Engineering Guizhou Normal University Guiyang550025 China

To reduce the stacking fault energy (SFE) of the alloys, silicon (Si) was introduced into Fe40Mn35Co20Cr5 dual-phase high entropy alloys (HEAs). We propose a novel mechanism supported by first-principles calculations that predicts Si atoms may preferentially substitute Cr atoms, resulting in enhanced lattice distortion and reduced SFE. Experimental results indicate that incorporating 0.2 wt % Si enhances the ductility of the alloy while maintaining its strength through a synergistic effect involving dislocations and phase transformation. Furthermore, in the Si0.2 alloy, the integrity of 9R structures is preserved, thereby enhancing the transformation-induced plasticity (TRIP) effect and facilitating attainment of an optimal balance between strength and ductility. However, incorporation of 0.1 wt % and 0.3 wt % Si content leads to a decline in mechanical properties due to improper Si content causing grain growth and premature phase transition. Therefore, meticulous selection of an appropriate Si content is crucial for simultaneously enhancing both strength and ductility. © 2024, The Authors. All rights reserved.

关键词： Ductility

来源：评论

学校读者我要写书评

暂无评论

Variable-Weight Model Predictive Modulation Strategy for A Si-SiC Cascaded H-Bridge Inverter

Variable-Weight Model Predictive Modulation Strategy for A S...

引用

Smart Power & Internet Energy Systems (SPIES), International Conference on

作者： Ziyue Guo Zishun Peng Huimin Quan Zhenxing Zhao Minying Li Yong Ning College of Electrical and Information Engineering Hunan University Changsha China National-Local Joint Engineering Laboratory of Digitalize Electrical Design Technology Wenzhou University Wenzhou China School of Electrical and Information Engineering Hunan Institute of Engineering Xiangtan China UPS Institute Guangdong Zhicheng Champion Group Co. Ltd. Dongguan Guangdong

A Si-SiC cascaded H-bridge (CHB) inverter, due to the redundancy of switching states, can operate with different switching of Si and SiC cells. Therefore, apart from considering the power quality and efficiency of inverters, it also brings the problem of switching between Si and SiC cells. For this, a variable-weight Model Predictive Control (MPC) method is designed to select the overall switch state and assign the switching of cells. A five-level Si-SiC CHB inverter device is built. Compared with fixed weight MPC, the output current THD can be reduced by 1.89% or the device efficiency can be improved by 0.1396%.

关键词： Weight control Silicon carbide Switching frequency Power quality Switching loss Switches Inverters

来源：评论

学校读者我要写书评

暂无评论

design of Three-Dimensional B-C-N Structures Via Tailoring Gnrs and Bnnrs

SSRN

引用

SSRN 2023年

作者： Ma, Mengdong Zhu, Li Xiong, Mei Li, Baozhong Wu, Yingju Ying, Pan Zhao, Zhisheng He, Julong Kang, Zhenhui Macau University of Science and Technology Taipa999078 China State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die & Mould Tianjin University of Technology and Education Tianjin300222 China National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology Engineering Research Center of Materials Behavior and Design Ministry of Education Nanjing University of Science and Technology Nanjing210094 China South China University of Technology China

A series of porous 3D Cx(BN)y crystal structures with full sp2 hybridization are obtained by polymerizing edge-functionalized graphene nanoribbons (GNRs) and boron nitride nanoribbons(BNNRs). Herein, the crystal structure and properties of Cx(BN)y are systematically and comprehensively investigated by first-principles calculations, deriving that it is feasible to achieve performance tuning by controlling the nanoribbon width. Thermodynamic stability, these structures have energy advantages with respect to the previously proposed B-C-N structures, and the thermodynamic stability of the structures deteriorates with the increase of the carbon content. electrical properties, the bandgap value is tunable between 0.1-1.1eV, and the bandgap value increases with the width of BNNRs at the same width of GNRs. Mechanical properties, these structures are mechanically stable, and exhibit unexpected superstretching properties, with tensile lengths up to 2.4 times the original length, bulk modulus tunable between 137-167GPa, shear modulus tunable between 81-115GPa, and the incompressibility of the structure decreases as the nanoribbon width increases. © 2023, The Authors. All rights reserved.

关键词： Energy gap

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：