检索结果-南通市图书馆

Double Update Intelligent Strategy for Permanent Magnet Synchronous Motor Parameter Identification

Computers, Materials & Continua 2023年第2期74卷 3391-3404页

作者： Shuai Zhou Dazhi Wang mingtian du Ye Li Shuo Cao School of Information Science and Engineering Northeastern UniversityShenyang110819China Department of Mechanical Engineering The University of MelbourneVictoria3010Australia College of Information Engineering Shenyang Polytechnic CollegeShenyang110045China

The parameters of permanent magnet synchronous motor(PMSM)affect the performance of vector control servo *** of the complexity of nonlinear model of PMSM,it is very difficult to identify the parameters of *** at the problems of large amount of data calculation,low identification accuracy and poor robustness in the process of multi parameter identification of permanent magnet synchronous motor,this paper proposes a weighted differential evolutionary particle swarm optimization algorithm based on double update *** introducing adaptive judgment factor to control the proportion of weighted difference evolution(WDE)algorithm and particle swarm optimization(PSO)algorithm in each iteration process,and consider using PSO algorithm or WDE algorithm to update individuals according to the probability *** individuals obtained from WDE operation are used to guide the individual evolution process in PSO operation through the information *** proposed WDEPSO algorithm can ensure the diversity and effectiveness of the individual evolution of the *** algorithm is applied to parameter identification of PMSMdrive *** simulation results show that the proposed algorithm has better convergence performance and has strong robustness,parameter identification of permanent magnet synchronous motor based on proposed method does not need to rely on more data sheet on the motor design value,can motor stator resistance identification at the same time,the rotor flux linkage,d/q-axis inductance and electrical parameters,and can effectively track the parameters value.

关键词： PMSM parameter identification WDE PSO WDEPSO

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Protective Effect of Selenium Supplementation on Cerebral Ischemia-Reperfusion Injury after Ischemic Stroke

引用

Journal of Biosciences and Medicines 2025年第1期13卷 184-195页

作者： mingtian Lu Zehua He Zhejing Ding Zhengwei Chen Tianyang Guan Zhongliang Li Guomin Huang Guangsen Cheng Shaoqin Liao Yu Liu Cerebrovascular Diseases Department Zhuhai Clinical Medical College of Jinan University (Zhuhai Peoples Hospital) The First Affiliated Hospital of Faculty of Medicine Macao University of Science and Technology Zhuhai China

With the wide application of thrombolytic drugs and the advancement of endovascular therapeutic techniques, the recanalization treatment of acute artery occlusion in ischemic stroke (IS) has made a leap forward, but ischemic brain tissues still face ischemia-reperfusion injury after recanalization. Nowadays, effective neurological protective agents still cannot completely resist the multiple damages of ischemia-reperfusion injury. As an iron-dependent mode of programmed cell death, ferroptosis occupies an important position in ischemia-reperfusion injury. Selenium plays a unique protective role in ischemia-reperfusion injury as an active site element in the center of glutathione peroxidase. Therefore, the study mainly aims to review the protective role of selenium in IS and the related mechanisms, as well as the effect of selenium on the risk factors of IS.

关键词： Selenium Ischemic Stroke Cerebral Ischemia-Reperfusion Injury GPx4

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Impact of PCSK9 on Risk Factors for Ischemic Stroke and Potential Mechanisms

引用

American Journal of Molecular Biology 2025年第1期15卷 110-122页

作者： Zehua He mingtian Lu Zhejing Ding Zhengwei Chen Tianyang Guan Zhongliang Li Cheng Zhou Haiquan Tao Guangsen Cheng Yu Liu Cerebrovascular Diseases Department Zhuhai Clinical Medical College of Jinan University (Zhuhai Peoples Hospital) The First Affiliated Hospital of Faculty of Medicine Macao University of Science and Technology Zhuhai China

Proprotein convertase subtilisin/kexin type 9 (PCSK9) is a member of the proprotein convertase (PCs) family, which facilitates the degradation of low-density lipoprotein receptors (LDL-R) via intracellular and cell surface pathways, consequently elevating serum LDL-C levels. PCSK9 is implicated in various processes such as lipid metabolism, atherosclerosis, oxidative stress, inflammatory responses, thrombosis, and apoptosis. It is closely linked to ischemic stroke through its role in inducing and advancing atherosclerosis. PCSK9 inhibitors play a useful role in both acute and secondary prevention of ischemic stroke and can reduce the risk of ischemic stroke. This review examines the influence of PCSK9 on the risk factors associated with ischemic stroke and explores its potential mechanisms, and briefly describes the application of PCSK9 inhibitors in ischemic stroke.

关键词： Proprotein Convertase Subtilisin/Kexin Type 9 (PCSK9) Ischemic Stroke Atherosclerosis Inflammation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of electromagnetic boundary condition on dynamo actions

引用

Science China(Physics,Mechanics & Astronomy) 2015年第4期58卷 75-83页

作者： XU mingtian Department of Engineering Mechanics School of Civil Engineering Shandong University

In this paper, based on the mean field dynamo theory, the influence of the electromagnetic boundary condition on the dynamo actions driven by the small scale turbulent flows in a cylindrical vessel is investigated by the integral equation approach. The numerical results show that the increase of the electrical conductivity or magnetic permeability of the walls of the cylindrical vessel can reduce the critical magnetic Reynolds number. Furthermore, the critical magnetic Reynolds number is more sensi- tive to the varying electrical conductivity of the end wall or magnetic permeability of the side wall. For the anisotropic dynamo which is the mean field model of the Karlsruhe experiment, when the relative electrical conductivity of the side wall or the rel- ative magnetic permeability of the end wall is less than some critical value, the m=l （m is the azimuthal wave number） mag- netic mode is the dominant mode, otherwise the m=0 mode predominates the excited magnetic field. Therefore, by changing the material of the walls of the cylindrical vessel, one can select the magnetic mode excited by the anisotropic dynamo.

关键词： dynamo action mean field dynamo theory electromagnetic boundary condition

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Photorefractive Effect in an Azobenzene Chromophore Side Groups Polymer

引用

Journal of Wuhan University of Technology(Materials Science) 2014年第6期29卷 1290-1293页

作者：方华 LI mingtian School of Chemical and Environmental Engineering Wuhan Polytechnic University College of Materials Science and Chemistry Engineering Sichuan University of Science and Engineering

We have analyzed the photorefractive（PR） effect of a polymer composite was reported which combines a novel bi-functional poly（N-vinyl）-3-[p-nitrophenylazo]carbazolyl（PVNPAK） and 2,4,7-trinitro-9-fluorenone（TNF）. PVNPAK was synthesized by a post-azo-coupling reaction, with an azo derivative as the electrooptic chromophore and carbazolyl as photoconductive moiety. The asymmetric two-beam coupling gain of 13.9 cm-1 and diffraction efficiency of 1.2% for poled polymer film fabricated using a corona poling are obtained at the wavelength of 647.1 nm, confirming photorefractivity. We interpreted this result as the orientational enhancement, in which the spatial charge field may enhance the modulated orientation of the azobenzen chromophore. It is unexpected that the photorefractive gain of 9.5 cm-1 for the unpoled polymer film also was observed without external field in two-beam coupling（TBC） experiment. This phenomenon is attributed to a light-induced orientational grating when the azobenzene groups are illuminated by polarized light.

关键词： photorefractive (PR) effect poly(N-vinyl)-3-[p-nitrophenylazo]carbazolyl orientational enhancement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research and improvement on the limitation of authentication test

引用

High Technology Letters 2008年第3期14卷 266-270页

作者：刘家芬 Zhou mingtian Department of Computer Science and Engineering University of Electronic Science ＆ Technology of China Chengdu 610054 P. R. China

This paper elaborated on the limitation of authentication test theorem, illustrated the fundamental cause of that limitation through examples, then enhanced authentication test to solve this problem, and also proved the soundness of that improvement with formal method. The enhanced theory can deal with protocols with test component as proper subterm of other regular node＇ s component under certain conditions, and extend the application scope of authentication test. With enhanced authentication test, the automatic protocol verification tools will be more efficient and convenient.

关键词： authentication test strand space formal method security protocol analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The influence of viscous heating on the entransy in two-fluid heat exchangers

引用

Science China(Technological Sciences) 2011年第5期54卷 1267-1274页

作者： GUO JiangFeng XU mingtian CHENG Lin Institute of Thermal Science and Technology Shandong University Jinan 250061 China Insititute of Engineering Thermophysics Chinese Academy of Science Beijing 100190 China

In the present work, water and olive oil are taken as working fluids to study the influence of viscous heating on the entransy dissipation caused by heat transfer in two-fluid heat exchangers. The results show that the influence of viscous heating on the entransy loss associated with heat transfer can not be neglected for the liquids having large dynamic viscosity. The viscous heating effect maintains the heat transfer ability of the working fluids, relatively reduces the entransy loss in heat exchangers; the viscous heating effect relatively augments the entropy generation due to heat transfer and the available energy destruction in heat exchangers. For the working fluid having large dynamic viscosity, the increasing rates of the entransy and entropy generation contributed by the viscous heating are even larger than those contributed by heat transfer, when the mass flow rate of working fluid reaches a certain value under the fixed heat transfer area condition. Thus, the entransy loss rate decreases and the growth rate of entropy generation increases as the mass flow rate of the working fluid increases. Under the same other conditions, the heat transfer entransy loss rate and entropy generation rate per unit heat transfer rate obtained when the fluid having a smaller heat capacity rate is cold fluid are less than those obtained when the fluid having a smaller heat capacity rate is hot fluid.

关键词： entransy entransy dissipation viscous heating heat exchanger entropy generation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

High-resolution angle-resolved photoemission study of oxygen adsorbed Fe/MgO(001)

引用

Chinese Physics B 2020年第6期29卷 60-68页

作者： mingtian Zheng Eike FSchwier Hideaki Iwasawa Kenya Shimada Graduate School of Science Hiroshima UniversityKagamiyama 1-3-1Higashi-Hiroshima 739-8526Japan Hiroshima Synchrotron Radiation Center Hiroshima UniversityKagamiyama 2-313Higashi-Hiroshima 739-0046Japan

We have investigated the electronic states of clean Fe(001) and oxygen adsorbed Fe(001)–p(1 × 1)-O films epitaxially grown on MgO(001) substrates by means of polarization-dependent angle-resolved photoemission spectroscopy(ARPES)and extensive density-functional theory(DFT) calculations. The observed Fermi surfaces and band dispersions of pure Fe near the Fermi level were modified upon oxygen adsorption. By the detailed comparison of ARPES and DFT results of the oxygen adsorbed Fe surface, we have clarified the orbital-dependent p–d hybridization in the topmost and second Fe ***, the observed energy levels and Fermi wave numbers for the oxygen adsorbed Fe surface were deviated from the DFT calculations depending on the orbital characters and momentum directions, indicating an anisotropic interplay of the electron correlation and p–d hybridization effects in the surface region.

关键词： angle-resolved photoemission iron surface oxygen adsorption density-functional theory(DFT)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Buffer anion effects on water oxidation catalysis: The case of Cu(Ⅲ) complex

引用

Chinese Journal of Catalysis 2021年第8期42卷 1338-1344页

作者： Qifa Chen Haoyi du mingtian Zhang Center of Basic Molecular Science(CBMS) Department of ChemistryTsinghua UniversityBeijing 100084China

Water oxidation is the bottleneck of artificial *** the first ruthenium-based molecular water oxidation catalyst,the blue dimer,was reported by Meyer’ s group in 1982,catalysts based on transition metals have been widely employed to explore the mechanism of water *** the oxidation of water requires harsh oxidative conditions,the stability of transition complexes under the relevant catalytic conditions has always been a *** this work,we report the redox properties of a CuⅢ complex(TAML-CuⅢ] with a redox-active macrocyclic ligand(TAML) and its reactivity toward catalytic water ***-CuⅢ displayed a completely different electrochemical behavior from that of the TAML-CoⅢ complex previously reported by our ***-CuⅢ can only be oxidized by one-electron oxidation of the ligand to form TAML·+-CuⅢand cannot achieve water activation through the ligand-centered proton-coupled electron transfer that takes place in the case of TAML-CoⅢ.The generated TAML·+-CuⅢ intermediate can undergo further oxidation and ligand hydrolysis with the assistance of borate anions,triggering the formation of a heterogeneous B/CuOx nanocatalyst Therefore,the choice of the buffer solution has a significant influence on the electrochemical behavior and stability of molecular water oxidation catalysts.

关键词： Artificial photosynthesis Water oxidation Redox-active ligand Copper catalyst Buffer anion effect

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The entransy dissipation minimization principle under given heat duty and heat transfer area conditions

引用

Chinese Science Bulletin 2011年第19期56卷 2071-2076页

作者： GUO JiangFeng XU mingtian CHENG Lin Institute of Thermal Science and Technology Shandong University Jinan 250061 China

Under given heat duty and heat transfer area conditions, the equipartition of the entransy dissipation (EoED) principle, the equipartition of the temperature difference (EoTD) principle, and the equipartition of the heat flux (EoHF) principle are applied to the optimization design of a heat exchanger with a variable heat transfer coefficient. The results show that the difference between the results obtained using the EoED and EoTD principles is very small, far smaller than that between the results obtained using the EoED and EoHF principles. The correct entransy dissipation minimization principle is chosen to optimize the parameters in the hot and cold fluids in a two-fluid heat exchanger, under given heat duty and heat transfer area conditions. The results indicate that the proper choice of the two alternative fluids has an important role in the successful application of the entransy dissipation minimization principle. The fluid that could improve the total heat transfer coefficient should be chosen, or the fluid that makes the temperature profiles of the hot and cold fluids parallel and decreases the temperature difference between the hot and cold fluids after optimization simultaneously, could be the proper one.

关键词：换热面积最小化热负荷耗散总传热系数优化设计热流体温度分布

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：