IEEJ Transactions on Electrical and Electronic Engineering最新文献

{"title":"Application of Energy-Resolving Neutron Imaging to Major-Component Analyses of Materials Using Four-Channel Superconducting Detector","authors":"The Dang Vu,&nbsp;Hiroaki Shishido,&nbsp;Kazuya Aizawa,&nbsp;Takayuki Oku,&nbsp;Kenichi Oikawa,&nbsp;Masahide Harada,&nbsp;Kenji M. Kojima,&nbsp;Shigeyuki Miyajima,&nbsp;Kazuhiko Soyama,&nbsp;Tomio Koyama,&nbsp;Mutsuo Hidaka,&nbsp;Soh Y. Suzuki,&nbsp;Manobu M. Tanaka,&nbsp;Masahiko Machida,&nbsp;Shuichi Kawamata,&nbsp;Takekazu Ishida","doi":"10.1002/tee.24144","DOIUrl":"10.1002/tee.24144","url":null,"abstract":"<p>We proposed a current-biased kinetic inductance detector (CB-KID) as a novel superconducting detector to construct a neutron transmission imager. The characteristics of a superconducting neutron detector have been systematically studied to improve a spatial resolution down to 10<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>μm</mi>\u0000 </mrow>\u0000 <annotation>$$ upmu mathrm{m} $$</annotation>\u0000 </semantics></math> in transmission imaging. In this study, we report the application of the energy-resolving neutron imaging to investigate major components of materials by analyzing neutron transmission spectra from 1 meV to 500 keV. We succeeded in identifying that copper (Cu) and iron (Fe) are major components respectively in commercial nuts and screws as test samples with the aid of Rietveld imaging of transmission spectra (RITS) program in analyzing transmission spectra in longer wavelengths. The Ti screw was also confirmed by comparing the nuclear resonance absorption measurements and simulations in high-energy regions. We demonstrated that our superconducting neutron detector is applicable to reveal the transmission spectra in the wide range from cold-neutron energies <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mo>∼</mo>\u0000 <mi>meV</mi>\u0000 </mrow>\u0000 <annotation>$$ sim mathrm{meV} $$</annotation>\u0000 </semantics></math> to higher neutron energies even up to 500 keV. By selecting distinctive energy regions of pulsed neutrons, we succeeded in mapping the distribution of SmSn₃ compound using the strong neutron absorption in samarium (Sm) and the selective nuclear-resonance dips in Sm. By taking advantage of using CB-KID in conducting neutron imaging, the CB-KID method is extensively useful for various purposes in material sciences through energy-selective neutron spectroscopy from 1 meV to 500 keV. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 11","pages":"1888-1894"},"PeriodicalIF":1.0,"publicationDate":"2024-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141522066","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}

{"title":"EMC Research Efforts in the IEEJ Technical Committee and State-of-the-Art Case Studies on ESD Found in its Technical Papers","authors":"Osamu Fujiwara","doi":"10.1002/tee.24152","DOIUrl":"https://doi.org/10.1002/tee.24152","url":null,"abstract":"<p>Electrostatic discharge (ESD) has been known to cause electromagnetic noise against electronic equipment and devices even before the technical concept of electromagnetic compatibility (EMC) was established 68 years ago in the United States and 48 years ago in Japan, while the ESD still continues to be studied as one of the most significant issues that should be solved in EMC areas. This is largely because the underlying nature of ESD has yet to be essentially elucidated from an EMC perspective. On the other hand, as an academic research organization on EMC in Japan, a Technical Committee named ‘EMCJ’ on ‘Environmental Electromagnetic Engineering’ was founded in 1976 in both the Institute of Electrical Engineers of Japan (IEEJ) and the Institute of Electronics and Communication Engineers or the present IEICE (Institute of Electronics, Information and Communication Engineers) to address EMC concerns. Since then, the EMCJ has been jointly conducting EMC research activities under the IEICE as the nominating body and the IEEJ as the associative body, whereas the EMCJ of IEEJ was dissolved in 1999 to form a new Technical Committee on EMC (TC-EMC) in order to deal with EMC issues appropriate to the IEEJ. In this review, to mark the 25th anniversary of the IEEJ Technical Committee on EMC (TC-EMC) in 2024, the EMC research efforts and activities that the TC-EMC has conducted over the past 25 years from January 2000 to March 2024 are surveyed from 1272 technical papers presented at the technical meetings. Furthermore, among the ESD issues identified in these technical papers, the latest case studies utilizing ‘spark resistance laws’ that allow the analysis of the initial behavior of sparks, in which a spark is the essence of ESD and is the key to open the door to elucidate the phenomenon, particularly from an EMC perspective, are reviewed. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"20 1","pages":"4-18"},"PeriodicalIF":1.0,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/tee.24152","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142851328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Demand-Side Resource Selection Method for Feature Aggregation Based on Load Mapping","authors":"Bin Li,&nbsp;Tianyue Tang,&nbsp;Dan Wu,&nbsp;Shiming Tian,&nbsp;Yuting Xu,&nbsp;Shanshan Shi,&nbsp;Kaiyu Zhang","doi":"10.1002/tee.24149","DOIUrl":"https://doi.org/10.1002/tee.24149","url":null,"abstract":"<p>In order to improve the intuitiveness and automation of demand-side resource selection, a demand-side resource selection method based on load mapping matching is proposed in view of the increasing challenges of supply–demand balance in power networks and the rapid development of power demand-side management technologies. First, a two-dimensional load mapping of demand-side resources is drawn, and the load mapping is processed by Gaussian convolutional difference method. Then, feature points are extracted and located for the target resources and the loads of other resources in the demand-side resource pool, and similar feature key point pairs of demand-side resources are obtained. Finally, the demand-side resources with similar load characteristics to the target resources in the resource pool are screened according to the number of similar feature key point pairs, and the load resources similar to the target resources are finally identified by dividing the resource selection into priority levels. The experimental results show that the method can effectively extract feature key points, clearly and intuitively represent the features of demand-side resource load mapping, and can match to load resources with similar characteristics, which greatly transforms the demand-side resource selection mode. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 11","pages":"1788-1802"},"PeriodicalIF":1.0,"publicationDate":"2024-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142404839","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}

{"title":"Improvement of AC Conditioning Effect in Vacuum by High Frequency Voltage","authors":"Ryota Konagi,&nbsp;Hiroki Kojima,&nbsp;Shinsuke Iitsuka,&nbsp;Masato Kobayashi,&nbsp;Naoki Hayakawa","doi":"10.1002/tee.24139","DOIUrl":"https://doi.org/10.1002/tee.24139","url":null,"abstract":"<p>To improve the dielectric strength in vacuum, spark conditioning through repetitive breakdowns by AC or impulse voltage is an effective method. AC conditioning at commercial power frequencies has been widely used due to its cost-effectiveness, but the breakdown voltage after AC conditioning is generally lower compared to impulse conditioning. We have confirmed that multiple breakdowns occur successively in a half cycle of AC voltage application. It is considered that the multiple breakdowns are harmful for conditioning and triggered due to the previous breakdown in the same half cycle. In this paper, we discuss dielectric strength improvement by high frequency AC conditioning and how the multiple breakdowns are induced. We experimentally confirmed that the AC conditioning effect is improved by increasing the frequency of AC voltage for different applied AC conditioning voltages in a sphere-plane electrode system. We focused on the breakdown position from the light emission images during AC conditioning to investigate whether the multiple breakdowns were induced or affected by the previous breakdown. We found that the multiple breakdowns occurred close to the previous breakdown position. The multiple breakdowns would be induced by the collision of metal particles due to the previous breakdown with the counter electrode. These breakdowns do not contribute to removing protrusion and would lead to damage to the electrode surface. The increasing frequency of AC conditioning would suppress the multiple breakdowns and improve the dielectric strength in vacuum. © 2024 The Author(s). <i>IEEJ Transactions on Electrical and Electronic Engineering</i> published by Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 11","pages":"1781-1787"},"PeriodicalIF":1.0,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/tee.24139","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142404820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Logistics Supply Chain Management and Control Based on Mobile Communication Technology","authors":"Jisheng Wang,&nbsp;Lingling Luo,&nbsp;Jipeng Wang","doi":"10.1002/tee.24138","DOIUrl":"https://doi.org/10.1002/tee.24138","url":null,"abstract":"<p>With the development and application of 5G technology, more efficient and faster mobile communication has become an essential tool in logistics transportation and warehousing processes. Logistics supply chain management (SCM) is a logistics management system centered around the core products or business of the supply chain, as well as a logistics management system organized around the core logistics business. As an important part of logistics SCM, logistics control requires real-time monitoring and adjustment of transportation, warehousing, distribution, and other links. Mobile communication technology can provide real-time positioning, tracking, monitoring, and data transmission functions, which provides strong technical support for logistics control. It can also optimize logistics scheduling and improve logistics efficiency and accuracy, thereby reducing transportation costs and improving logistics quality and efficiency. This article aimed to explore the relationship between mobile communication technology and logistics SCM and control, and to use Principal Component Analysis (PCA) for research. The research results indicated that under the same other conditions, 38 and 37 people rated the X system as liked by companies A and B, accounting for 95% and 92.5% respectively; only 4 and 1 people rated the Y system as liked, accounting for 10% and 2.5% respectively; the likes and dislikes of the X system were much higher than those of the Y system. This indicated a positive relationship between mobile communication technology and logistics SCM and control systems. Logistics SCM and control based on mobile communication technology has become an important direction and development trend in current research on logistics SCM and control. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 9","pages":"1475-1482"},"PeriodicalIF":1.0,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141967944","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}

{"title":"Filler Particle Size Effect on Electrically and Thermally Properties of Thermal Conductive Thermoplastic Polyimide/Hexagonal Boron Nitride Composite Materials Fabricated by the Electrostatic Adsorption Method","authors":"Yoshinobu Murakami,&nbsp;Yujin Ichiba,&nbsp;Tomohiro Kawashima,&nbsp;Naohiro Hozumi","doi":"10.1002/tee.24135","DOIUrl":"https://doi.org/10.1002/tee.24135","url":null,"abstract":"<p>Composite materials with high heat dissipation and acceptable insulating properties are being developed. Minimizing filler contacts in the composite and is crucial for composite insulating materials. Here, an electrostatic adsorption method was used to prepare thermoplastic polyimide (tpPI) / orientation micro-sized hexagonal boron nitride (h-BN) composite insulating materials. Then the effects of h-BN particle size on the thermal conductivity and DC breakdown strength were investigated. Additionally, the finite element method was used for heat conduction analysis and the results were compared to the measurements. The particle size of the h-BN significantly influences the dc breakdown strength and the thermal conductivity. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 10","pages":"1590-1595"},"PeriodicalIF":1.0,"publicationDate":"2024-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142123383","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}

{"title":"EMI Shielding Properties of Al, Co, and Al/Co Thin Films","authors":"Umut Şükrü Yaşar,&nbsp;Haydar Kaya","doi":"10.1002/tee.24147","DOIUrl":"10.1002/tee.24147","url":null,"abstract":"<p>In this study, ultra-thin films of Al, Co, and multilayered Al/Co were fabricated using the magnetron sputtering technique on a very thin glass substrate. Subsequently, electromagnetic wave shielding measurements were conducted utilizing the transmission-reflection line method with the aid of a vector network analyzer. In measurements conducted within the X-band microwave frequency range within the waveguide, the maximum electromagnetic interference shielding effectiveness (EMI SE) values obtained were determined as 46 dB for Al, 24 dB for Co, and 48 dB for the multilayered Al/Co film. The structural and morphological analyses of these shielding films were included in the study using x-ray Diffraction (XRD), energy dispersive x-ray analysis (EDAX), Scanning Electron Microscopy (SEM), and Atomic Force Microscopy (AFM) techniques. Scattering parameter results indicated that increasing conductivity values enhance the shielding effectiveness (SE) while also demonstrating an additional positive impact on the SE value for multilayered structures. This finding indicates that nanometer-thick Al or Al/Co multilayer films could significantly protect electronic devices or individuals exposed to X-band microwave radiation. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 11","pages":"1756-1762"},"PeriodicalIF":1.0,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141347228","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}

{"title":"FDTD Simulation of a Small-Scale Charged Airplane Model in an Ambient Electric Field between Two Flat Electrodes","authors":"Shogo Okada,&nbsp;Yoshihiro Baba,&nbsp;Hiroyuki Tsubata","doi":"10.1002/tee.24121","DOIUrl":"10.1002/tee.24121","url":null,"abstract":"<p>When an airplane flies in an electric field under a thundercloud, electric fields at the edges and projected portions of the airplane are enhanced and leaders emanate from there. When a positive leader emanating upward from the airplane connects with a downward negative leader from the bottom of an ordinary thundercloud and a negative leader emanating downward from the airplane connects with an upward positive leader from the ground, a large lightning current flows along the channel bridged between the thundercloud and the ground through the airplane. Recently, a method to reduce the risk of lightning strikes to airplanes has been proposed. It controls the charge on the surface of an airplane to suppress the electric field at edges and projected portions of the airplane. In this paper, an airplane under a thundercloud is represented with a vertical conducting bar or a horizontal conducting bar with a small projected portion, which is placed between impulse-high-voltage-applied two flat electrodes, and it is analyzed using the finite-difference time-domain (FDTD) method. Corona and leader discharges emanating from edges and projected portions of an airplane model are considered with their engineering representations: 40-μS/m and 0.02 S/m conducting regions for corona and leader discharges, respectively. The airplane model is not pre-charged or pre-charged negatively. It follows from the FDTD-computed results that pre-charging an airplane model with a relevant amount of negative charge can avoid discharges from and to the airplane model. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 10","pages":"1631-1639"},"PeriodicalIF":1.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141351804","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}

{"title":"Thin Film Magnetic Sensor for Magnetic Near-Field Measurement in Wireless Power Transfer System","authors":"Loi Tonthat,&nbsp;Jerdvisanop Chakarothai,&nbsp;Ryota Suzuki,&nbsp;Katsumi Fujii,&nbsp;Shin Yabukami","doi":"10.1002/tee.24148","DOIUrl":"10.1002/tee.24148","url":null,"abstract":"<p>In this study, we employed a high-frequency-driven thin-film magnetic sensor to precisely measure the magnetic near field with enhanced spatial resolution, a challenge often faced by conventional loop antennas. Our study introduced an innovative approach utilizing this magnetic sensor to assess the magnetic near field in wireless power transfer systems, comparing its performance against that of a loop antenna. Our findings demonstrate that the magnetic sensor achieves its peak signal-to-noise ratio at a DC bias field of 4.7 Oe and carrier frequency of 0.5 GHz, boasting a detection limit for magnetic fields of ~0.4 A/m. Moreover, the magnetic field trend measured by the magnetic sensor closely aligns with simulation results, exhibiting sharper changes around the center compared to the loop antenna. These results highlight the superior sensitivity and spatial resolution of the magnetic sensor over conventional loop antennas. By enhancing the reliability of electronic systems across diverse applications, these sensors pave the way for advanced EMI/EMC evaluation techniques. © 2024 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 11","pages":"1763-1769"},"PeriodicalIF":1.0,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141360033","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}

{"title":"Boost DC-DC Converter with Non-dissipative Snubber","authors":"Yeu-Torng Yau","doi":"10.1002/tee.24140","DOIUrl":"10.1002/tee.24140","url":null,"abstract":"<p>To provide a hold-up time function in DC-DC supplies for cell site stations or data centers, using a boost converter with a bulk output capacitor as a front-end converter stage is a simple and highly cost-effective solution. However, conventional boost converters with a hard-switching operation result in low conversion efficiency and increased electromagnetic interference emissions. In this paper, a boost converter with a new non-dissipative snubber is proposed that only requires two additional diodes, an inductor, and a multilayer ceramic capacitor. The main feature of the proposed snubber is that the components are not located on the main power processing path. This means they only require low ratings, improving cost-effectiveness. A prototype converter is analyzed, realized, and applied to a 300 W redundant DC-DC power supply module for a 5G cell base station. © 2024 The Author(s). <i>IEEJ Transactions on Electrical and Electronic Engineering</i> published by Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.</p>","PeriodicalId":13435,"journal":{"name":"IEEJ Transactions on Electrical and Electronic Engineering","volume":"19 11","pages":"1858-1878"},"PeriodicalIF":1.0,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/tee.24140","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141358102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}