Mingmi Zhang

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In many applications, the content of a database changes over time. For example, new customer sequences are periodically added to a bookstore's database as the store attracts new customers. Similarly, every visit to a Web site will add a new log to the site's log database. There are also situations in which we have to delete sequences from the database. As(More)
Yinchuan Plain is one of drinking-water endemic fluorosis areas in China. To the west of the Yellow River phreatic water with high fluorine distributes in alluvial lacustrine plain and confined water only distributes in Dawukou region to the northwest of Helan Mountain. To the east of the Yellow River high fluorine groundwater with broadly distribution and(More)
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