2 0 0 0 OA 超音波霧化現象の可視化解析
- 著者
- 土屋 活美 林 秀哉 藤原 和久 松浦 一雄
- 出版者
- 日本エアロゾル学会
- 雑誌
- エアロゾル研究 (ISSN:09122834)
- 巻号頁・発行日
- vol.26, no.1, pp.11-17, 2011 (Released:2011-04-12)
- 参考文献数
- 19
- 被引用文献数
- 1
It has been claimed in the literature that selective ethanol separation from ethanol-water solution can be made through ultrasonic atomization. The causes of separation were explained in terms of parametric decay instability of capillary waves, accumulating acoustic energy in a highly localized surface of the capillary wave and effecting ultrasonic atomization. In this study, the atomization process is examined visually with some mechanistic view, and the dynamics of interfacial oscillations occurring along the perturbed protrusion or conical “liquid column/fountain jet” over the ultrasonic transducer are analyzed by high-speed imaging. It is found that the atomization process could be initiated by a sudden increase in surface roughness of microscale, which would be viewed as localized surface patches of two-dimensional capillary waves, often associated with contraction expansion sequence of surface to-pology. Such surface patches could bring further instability in generating a swarm of liquid droplets of microscale around the expanded phase of liquid column.
2 0 0 0 OA コロナ放電による負イオンとオゾンの生成と応用
2 0 0 0 OA 超音波霧化の原理と分離特性
- 著者
- 安田 啓司
- 出版者
- 日本エアロゾル学会
- 雑誌
- エアロゾル研究 (ISSN:09122834)
- 巻号頁・発行日
- vol.26, no.1, pp.5-10, 2011 (Released:2011-04-12)
- 参考文献数
- 6
- 被引用文献数
- 1
Separation characteristics of various solutes from the aqueous solutions with ultrasonic atomization were experimentally investigated. Monohydric alcohols and ketone were concentrated in the atomized droplets from the aqueous solution, while alcohol and amides were diluted in the droplets. These results suggest that the hydrophilic and hydrophobic properties of solute molecules may determine the separation characteristics of ultrasonic atomization. In order to develop a concentrator with ultrasonic atomization, ultrasonic atomization of ethanol aqueous solution was conducted. The atomization rate of water was the highest at the beginning of atomization, and the initial depth of solution which gave the maximum atomization rate of water was decreased with increasing the ultrasonic frequency. The atomization rate of ethanol was increased with the net electric power applied to the ultrasonic transducer, but it remained almost constant at different ultrasonic frequencies. At a relatively high net electric power, the atomization rate of water increased with the diameter of reservoir, while alcohol content in the atomized droplets were unaffected by the reservoir diameter.
1 0 0 0 OA 気候変動に与える火山活動の影響
- 著者
- 岩坂 泰信
- 出版者
- 日本エアロゾル学会
- 雑誌
- エアロゾル研究 (ISSN:09122834)
- 巻号頁・発行日
- vol.9, no.2, pp.127-133, 1994-06-20 (Released:2010-08-27)
- 参考文献数
- 11
1 0 0 0 OA 微小重力環境における粉塵爆発火炎の伝播挙動
1 0 0 0 OA 居住環境におけるアレルゲン・ダストに対する空気清浄対策
1 0 0 0 OA 原子力施設の空気管理
1 0 0 0 OA 分子動力学法によるナノ液滴の蒸発過程のシミュレーション
- 著者
- 王 青躍 栗原 幸大 桐生 浩希 坂本 和彦 三輪 誠 内山 巌雄
- 出版者
- 日本エアロゾル学会
- 雑誌
- エアロゾル研究 (ISSN:09122834)
- 巻号頁・発行日
- vol.23, no.2, pp.120-126, 2008-06-20 (Released:2008-06-25)
- 参考文献数
- 22
- 被引用文献数
- 2
In this study, we focus on the investigation of the airborne behavior of respirable particulate matters containing Japanese cedar pollen allergen Cry j 1 exfoliated from the Ubisch bodies on the pollen surfaces and Cry j 2 comprised in the starch granules within the pollen. The airborne Japanese cedar pollens were counted, and at the same time, the Cry j 1 and Cry j 2 particles were collected and determined in different particle sizes at the urban site (Cooperative Research Center of Saitama University) during daily sampling periods of the most severe pollination season of FY 2005 in Saitama, Japan.Morphological observation of Ubisch bodies exfoliated from pollen and ruptured pollens was performed with a scanning electron microscope. Moreover, the existing evidences of visualized Cry j 1 and Cry j 2 allergen particles below 1.1μm were also sensitively found by an immunofluorescence technique with a fluorescence microscope. Simultaneously, the high concentrations of Cry j 1 and/or Cry j 2 were determined in the fine particle sizes below 1.1μm. It was suggested that airborne respirable particulate matters containing Cry j 1 and Cry j 2 play a key role in the increasing incidence of asthma in the lower respiratory tract. Furthermore, although the release mechanisms of Cry j 1 and a Cry j 2 particles may be differed, the daily variation delays in the peaks of Cry j 1 (or Cry j 2) concentrations compared to the peaks of airborne pollen counts were observed since the fine particles were suspended in the atmosphere over a longer period of time after released. It is important to observe and determine the size distribution of airborne Japanese cedar pollen allergen particles in the long-term sampling research continually, and to elucidate the allergen particle release mechanisms. In the future, we should investigate the chemical, physical and biomedical combination effects on Japanese cedar pollen allergens, and have to consider proposing a new forecast informational system of the Japanese cedar pollen and their allergen particle variations.
1 0 0 0 OA 生物粒子とエアロゾル
- 著者
- 池田 耕一
- 出版者
- 日本エアロゾル学会
- 雑誌
- エアロゾル研究 (ISSN:09122834)
- 巻号頁・発行日
- vol.15, no.1, pp.5-13, 2000-03-20 (Released:2009-04-14)
- 参考文献数
- 19
1 0 0 0 OA ライダーにより検出された日本上空におけるエアロゾル鉛直分布の中長期的変動
- 著者
- 清水 厚
- 出版者
- 日本エアロゾル学会
- 雑誌
- エアロゾル研究 (ISSN:09122834)
- 巻号頁・発行日
- vol.33, no.2, pp.84-88, 2018-06-20 (Released:2018-06-29)
- 参考文献数
- 15
1 0 0 0 OA 大気汚染と酸性霧の形成
1 0 0 0 OA 半導体製造工程における汚染制御対象物質の動向
1 0 0 0 OA SARS-CoV-2感染機序についての構造生物学的研究の現状
- 著者
- 伊藤 隆
- 出版者
- 日本エアロゾル学会
- 雑誌
- エアロゾル研究 (ISSN:09122834)
- 巻号頁・発行日
- vol.36, no.4, pp.237-245, 2021-12-20 (Released:2021-12-24)
- 参考文献数
- 29
Severe acute respiratory syndrome coronavirus 2 (SARS‑CoV‑2) is the virus that causes the new coronavirus infection (COVID-19). The molecular structural basis of SARS-CoV-2 infection has been investigated by various structural biological studies including three-dimensional (3D) structural analysis of virus Spike protein, which directly mediates infection to human cells through the interaction with Angiotensin-converting enzyme 2 (ACE2), which locates on the cell surface of some of our tissues (e.g. lungs). Further, the 3D structures of main protease (3CLpro) and RNA-dependent RNA polymerase (RdRp) of SARS-CoV-2 provided useful information for understanding the mechanism of the amplification of viral genome RNA in our cells. In this paper, I would like to give an easy-to-understand overview of the current state of structural biology studies related to COVID-19, and also discuss the possibility of rational design of drugs.
1 0 0 0 OA 植物に対するエアロゾル粒子の影響
1 0 0 0 OA ウイルス感染対策としての換気の考え方
- 著者
- 諏訪 好英
- 出版者
- 日本エアロゾル学会
- 雑誌
- エアロゾル研究 (ISSN:09122834)
- 巻号頁・発行日
- vol.36, no.4, pp.246-252, 2021-12-20 (Released:2021-12-24)
- 参考文献数
- 19
Worldwide pandemic by COVID-19 still continues. Ventilation is recommended as one of the important measures against virus infection. However, if ventilation measures are taken in the wrong way, not only the measures can’t reduce the risk of infection, but also they may make increase it. The effect of ventilation as an infection control, how to determine the volume flow rate requirement, and the ventilation method for effective air exchange has been studied. Based on these results, how we should consider effective ventilation to reduce the risk of viral infections were discussed in this paper.
1 0 0 0 OA エアロゾル粒子まわりの気体流と粒子に働く力 -ボルツマン方程式による数値解析-
1 0 0 0 OA 粉じん爆発・火災とその防止策
1 0 0 0 OA 光触媒式小型空気清浄機による飛沫除去挙動の評価
- 著者
- 秋吉 優史 綿野 哲 落合 剛
- 出版者
- 日本エアロゾル学会
- 雑誌
- エアロゾル研究 (ISSN:09122834)
- 巻号頁・発行日
- vol.36, no.4, pp.263-272, 2021-12-20 (Released:2021-12-24)
- 参考文献数
- 24
A small air cleaner with the visible-light-responding photocatalyst was developed. This air cleaner is specialized in removal of the splashed droplets which flies between facing peoples to cope with various infectious diseases. Photocatalyst of a tungsten trioxide system which response efficiently to visible-light was sprayed on a conventional nonwoven fabric filter with a visible-light LED module and a silent type fan are applied. The photocatalyst was excited by visible-light to generate active oxygen that oxidizes and decompose various organic matters. In this study, the physical performance of the air purifier was estimated, 1) the removal action of splashed droplets from the oral cavity with special motion-picture system, 2) evaluation of the transmittance of droplets to the filter and 3) droplets capture performance in a clean bench. Furthermore, performance of the photocatalyst system was evaluated by formaldehyde gas decomposition rate in a small chamber. As a result, droplets of 5 micrometers or more can be removed effectively by the small air purifier, and it is considered that the virus contained in the droplets caught by the filter will be inactivated with the photocatalyst by degrees.