著者

上田 義勝 徳田 陽明 谷垣 実 赤松 重則 秦 隆志

出版者

公益社団法人 日本表面真空学会

雑誌

表面と真空 (ISSN:24335835)

巻号頁・発行日

vol.66, no.11, pp.654-659, 2023-11-10 (Released:2023-11-10)

参考文献数

23

---

The paper presents the results of electrical property measurements for submicron-scale bubbles (Ultra Fine Bubble, UFB) as a property that includes correlation with water. The relationship between the concentration of UFBs and average size and the electrical conductivity of water is shown, confirming that the presence of UFBs generated by oxygen gas decreases the electrical conductivity of water. In addition, the internal pressure was directly detected using the perturbation angle correlation method, and a lower internal pressure (about 3.4 atmospheres) than theoretical was measured. We proposed the use of ultrasonic waves as a simple detection method for bubbles, including the distinction between UFBs and impurities, and are still measuring the bubbles.

著者

赤松 重則 上田 義勝

出版者

日本混相流学会

雑誌

混相流 (ISSN:09142843)

巻号頁・発行日

vol.36, no.1, pp.20-27, 2022-03-15 (Released:2022-03-31)

参考文献数

21

---

Bubbles with a diameter less than 1μm are called ultrafine bubbles (UFB). And UFB is expected to be applied in the environment, agriculture and medical treatment. In this study, we will examine the possibility by using ultrasonic waves and ultrapure water (UPW), also the attenuation characteristics of UFB water, to analyze the properties of UFB. The attenuation characteristics of UFB water in broadband ultrasound waves up to 32.5 MHz were investigated. In the 1.5-2.5 MHz ultrasonic band, the attenuation coefficient in the near-field was relatively close to the theoretical value calculated from the bubble density measurement results. For the 32.5 MHz ultrasound, there was a clear difference in the attenuation coefficient for the bubble density distribution between the UPW and the UFB water. In addition, the change in the number density distribution of bubbles and the change in the attenuation coefficient were observed depending on the elapsed days after UFB generation. It is possible that the change is related to the increase in the bubble diameter of the UFB.

著者

佐藤 岳彦 上田 義勝 高橋 克幸 高木 浩一

出版者

日本混相流学会

雑誌

混相流 (ISSN:09142843)

巻号頁・発行日

vol.35, no.2, pp.251-258, 2021-06-15 (Released:2021-07-08)

参考文献数

35

被引用文献数

3

---

In this review, inactivation and activation of microorganisms using fine bubbles are introduced. In the first chapter, we introduce domestic and overseas research trends of sterilization methods using ozone and plasma. In the second chapter, we focus on researches such as cleaning of lipstick at cosmetic application, generation of plasma-activated microbubbles for sterilization of fresh foods and verification of underwater plasma characteristics under fine bubble dispersion for improvement of chemical activity of bubbles. The third chapter is an introduction of our activity through International Symposium on Application of High-voltage, Plasma & Micro/Nano Bubble to Agriculture (ISHPMNB).

著者

上田 義勝 小嶋 浩嗣 橋本 弘藏 松本 紘 長野 勇 岡田 敏美 向井 利典 岩井 宏徳 藤原 亮介

出版者

一般社団法人電子情報通信学会

雑誌

電子情報通信学会技術研究報告. A・P, アンテナ・伝播 (ISSN:09135685)

巻号頁・発行日

vol.101, no.366, pp.1-6, 2001-10-11

---

2000年12月4日にノルウェーのSvalbard諸島, Ny-Alesundにおいて, 文部科学省宇宙科学研究所の観測ロケットSS-520-2号機を用いた, 極域カスプ領域におけるイオンの加速, 加熱機構を調査するための実験が行われた.本稿ではプラズマ波動の観測を目的として搭載された, プラズマ波動受信機「PWA」(Plasma Wave Analyzer)について述べる.PWAは従来のプラズマ波動観測機の利点を取り入れつつ, 波形圧縮技術やデジタル周波数掃引技術などを新たに搭載した高機能かつ軽量な観測装置であり, ロケット実験においては非常に高精度の観測データを得ることが出来た.本稿ではこれまでに判明している解析結果についてまとめる.