Retrieval aerosols optical thickness over Beijing and its surrounding area from MODIS data aims at providing a new, economical and convenient measurement for urban air pollution monitoring.
本论文利用MODIS资料遥感北京及其周边地区气溶胶光学厚度是为了提供监测城市大气污染新的、经济而便捷的观测手段。
The Network Database of five types domestic Special Literature retrieval is introduced in this article, it can provide an accurate and convenient retrieval path for readers and researchers.
文章主要介绍了国内可以检索的五类特种文献网络数据库，为广大读者和科研工作者利用特种文献提供更准确更便捷的检索途径。
Nowadays, online patent databases make patent retrieval more convenient, while patent analysis tools make patent analysis more efficient.
网上专利数据库方便了专利信息的检索，而相应专利分析软件的出现又使得专利分析更加快捷有效。
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