Pub Date : 2023-08-01DOI: 10.1541/ieejfms.143.l8_1
{"title":"基礎・材料・共通部門役員会・委員会名簿","authors":"","doi":"10.1541/ieejfms.143.l8_1","DOIUrl":"https://doi.org/10.1541/ieejfms.143.l8_1","url":null,"abstract":"","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper describes an effect of transient electromagnetic fields on the germination of seed plants. In our experiment, transient electromagnetic fields by spark discharges were applied to seeds of asparagus, parsley, carrot, lettuce and Komatsuna. In this experiment, the pulse widths of discharge current (800 A) were set to 3 µs, and the number of applications were set to 5 times, 10 times, 20 times and 30 times, respectively. As a result, we found that 1) the germination rate tended to increase within a certain range of the number of applications, 2) the germination rate decreased when the number of applications exceeded a certain number.
{"title":"Study on Effect of Transient Electromagnetic Field on Germination of Seed Plants","authors":"Shouta Hazama, Kazuki Tsuchiya, Yuusuke Nakagawa, Masao Masugi","doi":"10.1541/ieejfms.143.280","DOIUrl":"https://doi.org/10.1541/ieejfms.143.280","url":null,"abstract":"This paper describes an effect of transient electromagnetic fields on the germination of seed plants. In our experiment, transient electromagnetic fields by spark discharges were applied to seeds of asparagus, parsley, carrot, lettuce and Komatsuna. In this experiment, the pulse widths of discharge current (800 A) were set to 3 µs, and the number of applications were set to 5 times, 10 times, 20 times and 30 times, respectively. As a result, we found that 1) the germination rate tended to increase within a certain range of the number of applications, 2) the germination rate decreased when the number of applications exceeded a certain number.","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135931045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-01DOI: 10.1541/ieejfms.143.l7_1
{"title":"基礎・材料・共通部門役員会・委員会名簿","authors":"","doi":"10.1541/ieejfms.143.l7_1","DOIUrl":"https://doi.org/10.1541/ieejfms.143.l7_1","url":null,"abstract":"","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135265048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.1541/ieejfms.143.l6_1
{"title":"基礎・材料・共通部門役員会・委員会名簿","authors":"","doi":"10.1541/ieejfms.143.l6_1","DOIUrl":"https://doi.org/10.1541/ieejfms.143.l6_1","url":null,"abstract":"","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135673803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-01DOI: 10.1541/ieejfms.143.l5_1
{"title":"基礎・材料・共通部門役員会・委員会名簿","authors":"","doi":"10.1541/ieejfms.143.l5_1","DOIUrl":"https://doi.org/10.1541/ieejfms.143.l5_1","url":null,"abstract":"","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136048362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The pulsed electroacoustic method determines the distribution of space charge in an insulation system by applying a pulse voltage and detecting the acoustic response. It estimates the location and magnitude of charges from time-domain signals. For quantitative analysis, a bias voltage is applied to a specimen with no space charge, and the acoustic signal generated from the electrodes only is used as a reference waveform for calibration. However, a full-scale, extra-high voltage insulation system often already contains space charges in it. Therefore, a method of acquiring a reference signal under such a condition was studied. We studied methods to compare voltage variations and response signal variations. We proposed a method that measures the signal difference at different voltages. In addition, we proposed a method of correlating voltage and signal variations that may allow for more rapid signal acquisition. The feasibility was proved using an 11 mm-thick mimic polyethylene specimen.
{"title":"Basic Study on Calibration using Waveform Variation in Space Charge Measurement by Pulsed Electroacoustic Method","authors":"Xiaoxin Li, Tomohiro Kawashima, Yoshinobu Murakami, Naohiro Hozumi","doi":"10.1541/ieejfms.143.136","DOIUrl":"https://doi.org/10.1541/ieejfms.143.136","url":null,"abstract":"The pulsed electroacoustic method determines the distribution of space charge in an insulation system by applying a pulse voltage and detecting the acoustic response. It estimates the location and magnitude of charges from time-domain signals. For quantitative analysis, a bias voltage is applied to a specimen with no space charge, and the acoustic signal generated from the electrodes only is used as a reference waveform for calibration. However, a full-scale, extra-high voltage insulation system often already contains space charges in it. Therefore, a method of acquiring a reference signal under such a condition was studied. We studied methods to compare voltage variations and response signal variations. We proposed a method that measures the signal difference at different voltages. In addition, we proposed a method of correlating voltage and signal variations that may allow for more rapid signal acquisition. The feasibility was proved using an 11 mm-thick mimic polyethylene specimen.","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135227069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Silicone gel is widely used to encapsulate power modules, and improvement of its dielectric strength has been required. So, the purpose of our research is to improve dielectric strength of silicone gel encapsulant, and we focus on crosslinking degree of silicone gel. Previous studies have shown that growth mechanism of electrical tree changes with crosslinking degree of silicone gel. This suggests the possibility that the presence of the interface by different crosslinking degrees inhibits the tree growth. In this paper, we have investigated the tree growth and breakdown characteristics in silicone gel - crosslinking degrees graded layer materials. The interfaces in our study are arrange as being vertical to the line of electric force. Consequently, it was clarified that barrier effect of interface by different crosslinking degrees and the relaxation of electric field in low crosslinking degree region retards on tree growth, which improves the dielectric strength.
{"title":"Electrical Treeing Phenomena in Two-Layer Silicone Gel with Different Crosslinking Degrees and its Dielectric Strength","authors":"Risa Kuroda, Hyeon-Gu Jeon, Haruo Ihori","doi":"10.1541/ieejfms.143.166","DOIUrl":"https://doi.org/10.1541/ieejfms.143.166","url":null,"abstract":"Silicone gel is widely used to encapsulate power modules, and improvement of its dielectric strength has been required. So, the purpose of our research is to improve dielectric strength of silicone gel encapsulant, and we focus on crosslinking degree of silicone gel. Previous studies have shown that growth mechanism of electrical tree changes with crosslinking degree of silicone gel. This suggests the possibility that the presence of the interface by different crosslinking degrees inhibits the tree growth. In this paper, we have investigated the tree growth and breakdown characteristics in silicone gel - crosslinking degrees graded layer materials. The interfaces in our study are arrange as being vertical to the line of electric force. Consequently, it was clarified that barrier effect of interface by different crosslinking degrees and the relaxation of electric field in low crosslinking degree region retards on tree growth, which improves the dielectric strength.","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135227507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We propose the novel magnetic compensation method which is suitable to compensate gradient magnetic fields. The method is to be applied to a conventional large-scale, tri-axial active magnetic shielding system such as spacecraft magnetic testing facility. The essences of this method are adoption of compensation coils which have degrees of freedom in their coil orientations, and their installation position, which is chosen to have certain distances from the center of the shielding area. The method works with at least 4 compensation coils. In this research, we actually demonstrated the method with scaled-down experiment. Disturbance magnetic field (B) at the target zone was suppressed from 21.33nT to -1.54nT and magnetic field uniformity (ΔB) within the test zone was improved from 2.3nT to 0.015nT. In terms of magnetic field gradient, improvement from over 4nT/m to below 0.5 nT/m was achieved.
{"title":"A Novel Method Applicable to Large-Scale Active Magnetic Shielding System which Effectively Compensates Gradient Magnetic Fields Originated from the Surrounding Buildings","authors":"Takuto Ogata, Naofumi Murata, Takafumi Shimizu","doi":"10.1541/ieejfms.143.67","DOIUrl":"https://doi.org/10.1541/ieejfms.143.67","url":null,"abstract":"We propose the novel magnetic compensation method which is suitable to compensate gradient magnetic fields. The method is to be applied to a conventional large-scale, tri-axial active magnetic shielding system such as spacecraft magnetic testing facility. The essences of this method are adoption of compensation coils which have degrees of freedom in their coil orientations, and their installation position, which is chosen to have certain distances from the center of the shielding area. The method works with at least 4 compensation coils. In this research, we actually demonstrated the method with scaled-down experiment. Disturbance magnetic field (B) at the target zone was suppressed from 21.33nT to -1.54nT and magnetic field uniformity (ΔB) within the test zone was improved from 2.3nT to 0.015nT. In terms of magnetic field gradient, improvement from over 4nT/m to below 0.5 nT/m was achieved.","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136180444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Effect of secondary electron emission coefficient on accumulated charge density distributions in atmospheric pressure dielectric barrier discharges have been simulated using two dimensional fluid model. Spatio-temporal distributions of accumulated charge density on each side of dielectric have been examined. The differences of conventional waveforms of accumulated charge density and the simulated results were clarified. And when the dielectrics were negatively accumulated, charges were uniformly accumulated, while positive charges were not. Randomness of streamers occurrence, and self-organized structures have been also examined by the accumulated charge distributions.
{"title":"Spatio-temporal Distributions of Accumulated Charge Density in Atmospheric Pressure Dielectric Barrier Discharges","authors":"Haruaki Akashi, Tomokazu Yoshinaga","doi":"10.1541/ieejfms.143.76","DOIUrl":"https://doi.org/10.1541/ieejfms.143.76","url":null,"abstract":"Effect of secondary electron emission coefficient on accumulated charge density distributions in atmospheric pressure dielectric barrier discharges have been simulated using two dimensional fluid model. Spatio-temporal distributions of accumulated charge density on each side of dielectric have been examined. The differences of conventional waveforms of accumulated charge density and the simulated results were clarified. And when the dielectrics were negatively accumulated, charges were uniformly accumulated, while positive charges were not. Randomness of streamers occurrence, and self-organized structures have been also examined by the accumulated charge distributions.","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136181306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-01DOI: 10.1541/ieejfms.143.l3_1
{"title":"IEEJ Fundamentals and Materials Society","authors":"","doi":"10.1541/ieejfms.143.l3_1","DOIUrl":"https://doi.org/10.1541/ieejfms.143.l3_1","url":null,"abstract":"","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136181513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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