IEEJ Transactions on Electrical and Electronic Engineering最新文献_第9页

Continuous On-Chip Synthesis of Ag Nanoparticles Assisted by Resonant Microwave Heating Using a Post-Wall Waveguide 利用壁后波导在共振微波加热辅助下进行银纳米粒子的片上连续合成

IF 1 4区工程技术

IEEJ Transactions on Electrical and Electronic Engineering Pub Date : 2024-07-18 DOI: 10.1002/tee.24169

Kaito Fujitani, Mitsuyoshi Kishihara, Munehiro Sugiyama, Yuichi Utsumi

{"title":"Continuous On-Chip Synthesis of Ag Nanoparticles Assisted by Resonant Microwave Heating Using a Post-Wall Waveguide","authors":"Kaito Fujitani, Mitsuyoshi Kishihara, Munehiro Sugiyama, Yuichi Utsumi","doi":"10.1002/tee.24169","DOIUrl":"10.1002/tee.24169","url":null,"abstract":"Microfluidics made of dimethylpolysiloxane were developed for chemical synthesis using microwave heating at 24.125 GHz, and microwave efficiency was enhanced by the microwave resonance effect. In addition, the device was fabricated using a mold created using a 3D printer to reduce production costs. The microchip structure comprised a post-wall waveguide and a microchannel that passed through the waveguide. This post-wall waveguide also comprises metal columns (post-wall) instead of a conductor side wall, and easily introduces microchannels through the gaps between the metal columns. The waveguide length was adjusted to achieve a resonance frequency of 24 GHz using an electromagnetic wave simulation, assuming that the microchannel was filled with pure water. Microwaves with an input power of 4 W caused a maximum temperature increase of 93 °C; this result is ~10 °C higher than that of a microchip with non-resonant structure. In this study, Ag nanoparticles were synthesized using a chemical reaction induced by microwave irradiation of a chip flow system. Owing to irradiating the mixing reagent with microwaves of an input power of 4 W while controlling the flow rate at 0.7 μl/min, the formation of Ag nanoparticles with an average particle size of ~19.2 ± 2.4 nm was demonstrated by absorbance measurements and dynamic light scattering. It is expected that microwave microfluidics enhanced by the resonance effect will substantialize nanoparticle synthesis and high-efficiency automated chemical synthesis combined with multichemical unit operations. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 12","pages":"2072-2080"},"PeriodicalIF":1.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of a Database-Driven Controller for a Nonlinear System with Unknown Time-Delay 为具有未知时延的非线性系统设计数据库驱动控制器

IF 1 4区工程技术

IEEJ Transactions on Electrical and Electronic Engineering Pub Date : 2024-07-18 DOI: 10.1002/tee.24173

Yamato Tokunaga, Toru Yamamoto

引用次数: 0

Analysis of a Novel Consequent-Pole Dual-Stator Linear Permanent Magnet Vernier Machine Employing Mover Slot PM 采用移动槽 PM 的新型顺次极双定子线性永磁游标机械分析

IF 1 4区工程技术

IEEJ Transactions on Electrical and Electronic Engineering Pub Date : 2024-07-18 DOI: 10.1002/tee.24174

Mingjie Wang, Pengcheng Li, Yanyan Li, Wanying Jia, Yongpeng Shen

{"title":"Analysis of a Novel Consequent-Pole Dual-Stator Linear Permanent Magnet Vernier Machine Employing Mover Slot PM","authors":"Mingjie Wang, Pengcheng Li, Yanyan Li, Wanying Jia, Yongpeng Shen","doi":"10.1002/tee.24174","DOIUrl":"10.1002/tee.24174","url":null,"abstract":"This paper proposes a novel consequent-pole dual-stator linear permanent magnet vernier machine (DS-LPMVM) with PM in the mover slot opening, which has a bi-directional flux modulation effect. The novelty of the proposed machine consists of consequent-pole double-sided topology with toroidal windings placed in the mover slot, as well as PMs both on the stator and mover slot to improve the air gap magnetic field. The dual-stator adopts misalignment structure to suppress detent force and produce steady thrust. The electromagnetic parameters of the proposed DS-LPMVM are evaluated and quantitatively compared with the conventional linear permanent magnet vernier machine (C-LPMVM) in terms of air-gap flux density, no-load back EMF, inductance, and thrust. The geometrical parameters are designed to reduce the detent force. By analyzing the optimized structure parameters of the two machines, the good electromagnetic performances of the proposed machine are verified by the finite element method (FEM) and semi-analytical method, and both results of the two methods are basically the same. It is found that the amount of PMs for the proposed machine is reduced by 20% compared to the C-LPMVM, but the average thrust is increased by 20.7% and the thrust ripple is reduced to 4.04%. The results show that the proposed DS-LPMVM has better flux modulation effect and thrust characteristics than C-LPMCM. Finally, a 12-slot, 10-pole pairs prototype was manufactured and tested. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"20 1","pages":"101-113"},"PeriodicalIF":1.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141740449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Noise Enhances Excitability of a Neuronal Population with Heterogeneous Excitatory Neurons 噪音会增强具有异质性兴奋神经元的神经元群的兴奋性

IF 1 4区工程技术

IEEJ Transactions on Electrical and Electronic Engineering Pub Date : 2024-07-16 DOI: 10.1002/tee.24166

Tianyi Zheng, Bin Li, Yasuhiko Jimbo, Kenta Shimba, Kiyoshi Kotani

引用次数: 0

Research on Transformer Fault Diagnosis by WOA-SVM Based on Feature Selection and Data Balancing 基于特征选择和数据平衡的 WOA-SVM 变压器故障诊断研究

IF 1 4区工程技术

IEEJ Transactions on Electrical and Electronic Engineering Pub Date : 2024-07-15 DOI: 10.1002/tee.24171

Can Ding, Donghai Yu, Xiangdong Liu, Qiankun Sun, Qingzhou Zhu, Yiji Shi

{"title":"Research on Transformer Fault Diagnosis by WOA-SVM Based on Feature Selection and Data Balancing","authors":"Can Ding, Donghai Yu, Xiangdong Liu, Qiankun Sun, Qingzhou Zhu, Yiji Shi","doi":"10.1002/tee.24171","DOIUrl":"10.1002/tee.24171","url":null,"abstract":"Oil-immersed transformers as one of the most important equipment in the power system, the fault prediction of it in advance can effectively reduce the subsequent harm. Aiming at the selection of input features and data sample imbalance in the transformer fault diagnosis model, this paper adopts the recursive feature elimination (RFE) method combined with SMOTETomek comprehensive sampling method to optimize the above problems. First, RFE is used to traverse all the features and filter the optimal combination of them as input features, then SMOTETomek is used to perform balancing operation on the samples of the train set, and finally, whale optimization algorithm (WOA) is used to find the best hyperparameters for support vector machine (SVM), and the results are compared with the diagnostic models operated without processing and after single processing operation, respectively. After several sets of experiments, it is proved that the optimized comprehensive fault diagnosis model performs better on the test set than both the untreated and the singly processed models, which proves the effectiveness of the methodology used in this paper. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"20 1","pages":"41-49"},"PeriodicalIF":1.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141646308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Adaptive Optimal Resonance Fault Feature Enhancement for Wind Turbine Based on Frequency Search and Uncertainty Analysis 基于频率搜索和不确定性分析的风力涡轮机自适应优化共振故障特征增强技术

IF 1 4区工程技术

IEEJ Transactions on Electrical and Electronic Engineering Pub Date : 2024-07-14 DOI: 10.1002/tee.24168

Jian Dang, Yile Wang, Haolin Yin, Ji Li, Rong Jia, Peihang Li

{"title":"Adaptive Optimal Resonance Fault Feature Enhancement for Wind Turbine Based on Frequency Search and Uncertainty Analysis","authors":"Jian Dang, Yile Wang, Haolin Yin, Ji Li, Rong Jia, Peihang Li","doi":"10.1002/tee.24168","DOIUrl":"10.1002/tee.24168","url":null,"abstract":"The wind turbine fault feature has strong uncertainty due to various factors such as wind speed and equipment parameters. Based on the analysis of the vibration characteristics of wind turbines with unknown prior conditions, this paper conducts research on the enhancement method of fault features. First, analyzing the change in fault features caused by the change in operating conditions to lay the foundation for subsequent research; Second, for the uncertainty of wind turbine fault feature frequency, searching for fault features by constructing the energy in each spectral interval, then use signal noise optimal resonance to transfer noise energy to low frequency fault features to achieve the purpose of adaptive optimal resonance enhancement of fault feature; Finally, validation of the proposed method by simulation experiments and fault signals of actual wind turbine rolling bearings. The case shows that the proposed algorithm can effectively realize the uncertain fault feature of wind turbines search and enhancement. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 12","pages":"2044-2061"},"PeriodicalIF":1.0,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141650185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Partial Discharge Behavior Prior to Breakdown in Epoxy Resin 环氧树脂破裂前的局部放电行为

IF 1 4区工程技术

IEEJ Transactions on Electrical and Electronic Engineering Pub Date : 2024-07-14 DOI: 10.1002/tee.24160

Swe Zin Linn Htet, Takuya Kondo, Takuma Miyake, Tatsuya Sakoda, Takeshi Nishimura

引用次数: 0

Short-Circuit Point Estimation Method for Distribution Lines Using Smart-Meters 使用智能电表的配电线路短路点估算方法

IF 1 4区工程技术

IEEJ Transactions on Electrical and Electronic Engineering Pub Date : 2024-07-11 DOI: 10.1002/tee.24162

Yasuhiro Kodama, Kenji Otani

引用次数: 0

Ant Lion Optimizer Based on Spatial Information 基于空间信息的蚁狮优化器

IF 1 4区工程技术

IEEJ Transactions on Electrical and Electronic Engineering Pub Date : 2024-07-11 DOI: 10.1002/tee.24165

Nian-Feng Weng, Yi Liu, Qi-Bin Zheng, Geng-Song Li, Hong-Mei Li

引用次数: 0

First-Principles Calculations of Material Properties of CuCrZr Alloy Contacts CuCrZr 合金触点材料特性的第一原理计算

IF 1 4区工程技术

IEEJ Transactions on Electrical and Electronic Engineering Pub Date : 2024-07-05 DOI: 10.1002/tee.24154

Can Ding, Qinuo Liu, Qiankun Sun, Lu Feng

{"title":"First-Principles Calculations of Material Properties of CuCrZr Alloy Contacts","authors":"Can Ding, Qinuo Liu, Qiankun Sun, Lu Feng","doi":"10.1002/tee.24154","DOIUrl":"10.1002/tee.24154","url":null,"abstract":"CuCrZr alloy is widely used in vacuum circuit breaker contact materials and high-speed railroad contact wires, etc. The study of the effect of different Cr and Zr contents on the performance of CuCrZr alloy is of great significance for the improvement of circuit breaker's breaking capacity, as well as the load and structural stability under harsh working conditions. In this paper, the mechanical properties, electronic density of states and thermodynamic properties of CuCrZr solid solution alloys randomly doped by different concentrations of Cr and Zr are comparatively analyzed using first-principles calculations based on density functional theory. The results show that the alloys with different doping compositions have strong mechanical stability, electrical conductivity, and thermomechanical stability, and the reduction of the Cr/Zr doping concentration ratio can improve the toughness and ductility of the alloys, and the solid solution alloy with the composition of CuCr0.06Zr0.19 has the best machinability. The doping of Cr and Zr can improve the thermal stability of the alloy, Cr and Zr can be used as high-temperature toughening elements for Cu. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 12","pages":"1916-1926"},"PeriodicalIF":1.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141566586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0