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Climate, biophysical conditions and human activities all contribute to the occurrences of ecosystem and environment problems, i.e. water scarcity, desertification, salinization, in arid and semiarid zone of North China. Mongolian Scots pine tree (Pinus sylvestris var. mongolica) is one of the principal species of the windbreak and sand-fixing forest in this area. In this paper, we presented the calibration...
A great portion of data on the Web lies in the hidden databases of the deep Web. These databases can only be accessed through the query interfaces. Efficient and uniform data sampling approach is very important to other research work, for the data samples can give insight into the data quality, freshness and size information in the databases. However, the existing hidden database samplers are very...
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