Pub Date : 2023-10-01DOI: 10.1541/ieejfms.143.nl10_4
光司郎 北尾, 貴之 山田, 聡 須山
{"title":"研究グループ 紹介：株式会社NTTドコモ 6G-IOWN推進部 無線技術担当","authors":"光司郎 北尾, 貴之 山田, 聡 須山","doi":"10.1541/ieejfms.143.nl10_4","DOIUrl":"https://doi.org/10.1541/ieejfms.143.nl10_4","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":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135373429","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}
In this laboratory, we have been studying the decomposition of methylene blue contained in aqueous solutions containing organic matter (methylene blue) when the solutions are atomized (misted) and irradiated with ultraviolet LEDs. Irradiating a methylene blue aqueous solution with ultraviolet LED has a little decomposition effect. However, we report on the difference in the decomposition effect of misting methylene blue solution when irradiated with a deep ultraviolet LED. The results of this study suggest that misting increased the probability of contact between methylene blue and chemically active species that cause organic degradation.
{"title":"Combination of Ultraviolet LED and Atomization Technology to Decompose Methylene Blue into Aqueous Solution","authors":"Takanori Kozai","doi":"10.1541/ieejfms.143.325","DOIUrl":"https://doi.org/10.1541/ieejfms.143.325","url":null,"abstract":"In this laboratory, we have been studying the decomposition of methylene blue contained in aqueous solutions containing organic matter (methylene blue) when the solutions are atomized (misted) and irradiated with ultraviolet LEDs. Irradiating a methylene blue aqueous solution with ultraviolet LED has a little decomposition effect. However, we report on the difference in the decomposition effect of misting methylene blue solution when irradiated with a deep ultraviolet LED. The results of this study suggest that misting increased the probability of contact between methylene blue and chemically active species that cause organic degradation.","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135373437","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 : 2023-10-01DOI: 10.1541/ieejfms.143.l10_1
{"title":"基礎・材料・共通部門役員会・委員会名簿","authors":"","doi":"10.1541/ieejfms.143.l10_1","DOIUrl":"https://doi.org/10.1541/ieejfms.143.l10_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":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372445","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 : 2023-10-01DOI: 10.1541/ieejfms.143.nl10_1
{"title":"研究会（基礎・材料・共通部門）開催情報（2023年10月～12月）／令和6年電気学会全国大会 開催概要／基礎・材料・共通部門 論文誌 2023年10月号（Vol. 143, No. 10）目次","authors":"","doi":"10.1541/ieejfms.143.nl10_1","DOIUrl":"https://doi.org/10.1541/ieejfms.143.nl10_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":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372469","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 study investigated the dependence of ablation thresholds for Si on the incident angle of a P- or S- polarized XeCl excimer laser (0°, 15°, 30°, 45°, and 60°). As the incident angle increased, the ablation threshold decreased for the P-polarized laser and increased for the S-polarized laser. It was found that the dependence of the ablation threshold on laser incident angle was related to the incidence angle dependence of the reflectance for P-polarized or S-polarized laser light. Based on observed laser incident angle dependence of the ablation threshold for Si, periodic nanostructures of several hundreds of nanometers were formed over the entire surface of a pyramid structure when silicon solar cells were irradiated with linearly polarized laser pulses rotated 90° at a laser fluence of 0.5 J/cm2.
{"title":"Dependence of Ablation Thresholds for Silicon on Laser Incident Angle","authors":"Mitsuhiro Kusaba, Fumitaka Nigo, Masaki Hashida","doi":"10.1541/ieejfms.143.314","DOIUrl":"https://doi.org/10.1541/ieejfms.143.314","url":null,"abstract":"This study investigated the dependence of ablation thresholds for Si on the incident angle of a P- or S- polarized XeCl excimer laser (0°, 15°, 30°, 45°, and 60°). As the incident angle increased, the ablation threshold decreased for the P-polarized laser and increased for the S-polarized laser. It was found that the dependence of the ablation threshold on laser incident angle was related to the incidence angle dependence of the reflectance for P-polarized or S-polarized laser light. Based on observed laser incident angle dependence of the ablation threshold for Si, periodic nanostructures of several hundreds of nanometers were formed over the entire surface of a pyramid structure when silicon solar cells were irradiated with linearly polarized laser pulses rotated 90° at a laser fluence of 0.5 J/cm2.","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372649","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}
Femtosecond double optical pulse experiments with nanosecond time delay were conducted in air. Terahertz pulses were generated from laser plasmas produced by the irradiation with the main pulses on shockwave excited by the pre-pulse illumination. Intensity of the terahertz pulses depends on the time difference Δt and relative position Δy between the pre- and main pulses. We found a characteristic dependence of the intensity of the terahertz pulses on Δy at a longer time delay, Δt=14.7 ns, which has two maxima while only one maximum was observed when delay times were at and shorter than 9.7 ns. The results are discussed taking into account air density distribution of the shockwave. The terahertz emission spectroscopy shown here can be a useful technique for investigating density structure and its time variation of shockwave with high temporal resolution.
{"title":"Terahertz Radiation from Shockwave Front Irradiated with Femtosecond Optical Pulses","authors":"Takeshi Nagashima, Hsinhui Huang, Koji Hatanaka","doi":"10.1541/ieejfms.143.308","DOIUrl":"https://doi.org/10.1541/ieejfms.143.308","url":null,"abstract":"Femtosecond double optical pulse experiments with nanosecond time delay were conducted in air. Terahertz pulses were generated from laser plasmas produced by the irradiation with the main pulses on shockwave excited by the pre-pulse illumination. Intensity of the terahertz pulses depends on the time difference Δt and relative position Δy between the pre- and main pulses. We found a characteristic dependence of the intensity of the terahertz pulses on Δy at a longer time delay, Δt=14.7 ns, which has two maxima while only one maximum was observed when delay times were at and shorter than 9.7 ns. The results are discussed taking into account air density distribution of the shockwave. The terahertz emission spectroscopy shown here can be a useful technique for investigating density structure and its time variation of shockwave with high temporal resolution.","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135373438","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}
In recent years, research on the application of plasma treated water to agriculture or medicine has been actively carried out. For further application of plasma-treated water, it is desirable to understand the reaction process and to prepare plasma-treated water of arbitrary rate and concentration. In this study, the plasma treated water prepared by spark discharges in capillary quartz tubes were investigated. The diameter of the capillary tube was changed from 1.0 mm to 3.5 mm, and the change over time of concentrations of NO2-, NO3-, H2O2, and pH were investigated. It was found that the rate of increase in NO2- was suppressed as the diameter of the capillary tube decreased. As a result, the treatment time at pH = 4.6, the treatment time when NO3- starts to increase, and the treatment time when H2O2 starts to decrease, were increased. The reason for the decrease in the rate of increase in NO2- was considered that the generation of NO2 around the plasma was suppressed as the diameter of the capillary tube decreased, and NO2 was less dissolved in water.
{"title":"細管内スパーク放電照射プラズマ処理水の成分経時変化における細管径依存性","authors":"Takahiro Bando, Katsunoshin Takahashi, Shusaku Teshima, Toru Harigai, Hirofumi Takikawa, Kentaro Ide, Tomoaki Oishi, Mitsuo Tsume","doi":"10.1541/ieejfms.143.329","DOIUrl":"https://doi.org/10.1541/ieejfms.143.329","url":null,"abstract":"In recent years, research on the application of plasma treated water to agriculture or medicine has been actively carried out. For further application of plasma-treated water, it is desirable to understand the reaction process and to prepare plasma-treated water of arbitrary rate and concentration. In this study, the plasma treated water prepared by spark discharges in capillary quartz tubes were investigated. The diameter of the capillary tube was changed from 1.0 mm to 3.5 mm, and the change over time of concentrations of NO2-, NO3-, H2O2, and pH were investigated. It was found that the rate of increase in NO2- was suppressed as the diameter of the capillary tube decreased. As a result, the treatment time at pH = 4.6, the treatment time when NO3- starts to increase, and the treatment time when H2O2 starts to decrease, were increased. The reason for the decrease in the rate of increase in NO2- was considered that the generation of NO2 around the plasma was suppressed as the diameter of the capillary tube decreased, and NO2 was less dissolved in water.","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372658","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}
When a high electric field is applied to an insulating material for a long time, space charge may be injected into the insulating material. Space charge distorts the electric field in the insulating material and reduces the insulating performance. To elucidate the effects of space charge, one-dimensional simulations have been reported for homogeneous materials. However, space charge behavior in composite materials cannot be calculated using simulation techniques for homogeneous materials. Therefore, we have developed a two-dimensional simulation technique for space charge behavior in composite materials using the finite element method.
{"title":"複合材料における空間電荷挙動の2次元シミュレーション手法の構築","authors":"Toru Sawada, Kazutake Kadowaki, Yoshitaka Miyaji","doi":"10.1541/ieejfms.143.335","DOIUrl":"https://doi.org/10.1541/ieejfms.143.335","url":null,"abstract":"When a high electric field is applied to an insulating material for a long time, space charge may be injected into the insulating material. Space charge distorts the electric field in the insulating material and reduces the insulating performance. To elucidate the effects of space charge, one-dimensional simulations have been reported for homogeneous materials. However, space charge behavior in composite materials cannot be calculated using simulation techniques for homogeneous materials. Therefore, we have developed a two-dimensional simulation technique for space charge behavior in composite materials using the finite element method.","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372335","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}
{"title":"Preface to Special Issue on “Advanced Optical Applications and Visualization Technologies for Future Society II”","authors":"Mitsuhiro Kusaba","doi":"10.1541/ieejfms.143.307","DOIUrl":"https://doi.org/10.1541/ieejfms.143.307","url":null,"abstract":"未来社会（超スマート社会）に向けた基盤技術の一つとして光応用・視覚技術が位置付けされている。光応用・視覚技術分野は，テラヘルツ波から極端紫外線の波長領域の新しい光源開発，光ファイバおよび光イメージングによる応用技術，光リソグラフィによる微細化の応用技術とその","PeriodicalId":23081,"journal":{"name":"The transactions of the Institute of Electrical Engineers of Japan.A","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135372481","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 : 2023-09-01DOI: 10.1541/ieejfms.143.l9_1
{"title":"基礎・材料・共通部門役員会・委員会名簿","authors":"","doi":"10.1541/ieejfms.143.l9_1","DOIUrl":"https://doi.org/10.1541/ieejfms.143.l9_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":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136309689","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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