エアロゾル研究
Online ISSN : 1881-543X
Print ISSN : 0912-2834
25 巻 , 4 号
Winter
選択された号の論文の11件中1~11を表示しています
特集「さまざまなスケールでのエアロゾルのモデリング」
研究論文
  • 諏訪 好英, 小竹 茂夫, 古市 徹, 谷川 昇, 石井 一英, 岩崎 謙二
    2010 年 25 巻 4 号 p. 337-343
    発行日: 2010年
    公開日: 2011/01/18
    ジャーナル フリー
    Recently, waste disposal facilities are constructed as closed systems (CS disposal facilities), because of consideration on the influence to the surrounding environment. In these facilities, gaseous compornents such as methane, carbon dioxide, and hydrogen sulfite, are emitted from the waste. Large ventilation is required to ensure the safety of personnel working in the facilities by keeping the gas concentrations below the admitted level. However, it is difficult to evaluate the total emission rate of these gases, and the actual air exchange rate may be different from the set value because of natural ventilation and channeling of air flow in large space such as CS disposal facilities. The authors have developed a method to evaluate both emission rate and air exchange rate through the measurement of gas concentration change. Furthermore, the effect of natural ventilation caused by outside wind and that caused by temperature difference were compared. Finally, the possibility of environmental improvement by natural ventilation was studied.
ノート
  • Yoshiki OKADA, Toshiaki KIDA, Asei KAWASAKI, Hideya KAWASAKI, Ryuichi ...
    2010 年 25 巻 4 号 p. 344-348
    発行日: 2010年
    公開日: 2011/01/18
    ジャーナル フリー
    We describe the design and performance of an aerosol spectrometer that simultaneously measures size-dependent concentration and chemical composition of volatile organic nanoparticles ranging from 10 to 470 nm. The spectrometer consists of a differential mobility analyzer (DMA) for size classification and a gas chromatography mass spectrometer (GC-MS) for composition analysis. The size-classified particles of two kinds of hydrocarbons, an aliphatic hydrocarbon and aromatic hydrocarbon, were directly introduced into the GC-MS after vaporization of the particles. The relationships between the concentrations of classified particles measured with an aerosol electrometer and the peak area of major fragment ions measured with the GC-MS were given to show the detection limit of our spectrometer. For a particle size of 330 nm, the lower detection limit of the spectrometer for particle concentration was approximately 7.5×104 particles cm-3.
  • 藤田 慎一, 岡村 和幸, 三浦 和彦, 高橋 章
    2010 年 25 巻 4 号 p. 349-354
    発行日: 2010年
    公開日: 2011/01/18
    ジャーナル フリー
    The scavenging ratio of sea-salt components for the winter monsoon was presented on the coastal region of the Sea of Japan. Concentrations of sodium in air and precipitation were analyzed from four monitoring networks, CRIEPI, NPG, NIES/ADORC, and CRIEPI during the period from 1987 to 2008. On the basis of the monitoring data collected, we analyzed (i) seasonal variation and horizontal distribution of sea-salt concentration in air and precipitation, (ii) statistical properties of scavenging ratio on a regional scale, (iii) relationship between scavenging ratio and precipitation intensity, (iv) wet scavenging coefficient on a local scale, and (v) temporal variation of sodium concentration associated with the winter monsoon.
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