中大機構典藏-NCU Institutional Repository-提供博碩士論文、考古題、期刊論文、研究計畫等下載:Item 987654321/27251
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 70585/70585 (100%)
造访人次 : 23051871      在线人数 : 415
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 查询小技巧:
  • 您可在西文检索词汇前后加上"双引号",以获取较精准的检索结果
  • 若欲以作者姓名搜寻,建议至进阶搜寻限定作者字段,可获得较完整数据
  • 进阶搜寻


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: http://ir.lib.ncu.edu.tw/handle/987654321/27251


    题名: A novel method to measure aerosol water mass
    作者: Lee,CT;Hsu,WC
    贡献者: 環境工程研究所
    关键词: HYGROSCOPIC GROWTH;RELATIVE-HUMIDITY;PARTICLES;SIZE
    日期: 1998
    上传时间: 2010-06-29 18:21:14 (UTC+8)
    出版者: 中央大學
    摘要: Aerosol water mass is important in resolving aerosol composition, assessing aerosol light-scattering effect, and eventually in evaluating solar radiation received by the earth. This work presents a novel method to detect aerosol water mass for changing relative humidity (RH) at a stable room temperature. The target aerosols are generated by atomizing the 1.5% (wt/wt) (NH4)(2)SO4 or Na2SO4 solution and collected on a Teflon filter. Aerosol particles are then exposed to the moistened air and,later, purged by a pure helium how. Next, the purged water vapor is then directed through a thermal conductivity detector installed in an elemental analyzer for detection. Aerosol water is calculated from the difference between the system water associated with the blank filter and that with the particle deposited filter. System water is subsequently checked and is attributed to the retaining of water vapor by valves, sampling lines, blank filter, filter back-up screen, and the empty filter holder in the sampling system. As the results show, (NH4)(2)SO4 particles deliquesce at around 80% RH to contain 8 mol H2O/mol solute and Na2SO4 particles become saturated solution droplets containing about 13 mol H2O/mol solute at around 85% RH. The instrument detection limit for water released in the system is 24 mu g and the quantitative detection limit for (NH4)(2)SO4 particles is around 0.77 mu mol. This method provides a practical approach to assess the water mass associated with the aerosol collected in the field. (C) 1998 Elsevier Science Ltd. All rights reserved.
    關聯: JOURNAL OF AEROSOL SCIENCE
    显示于类别:[環境工程研究所 ] 期刊論文

    文件中的档案:

    档案 描述 大小格式浏览次数
    index.html0KbHTML464检视/开启


    在NCUIR中所有的数据项都受到原著作权保护.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈  - 隱私權政策聲明