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Symbolic data analysis is a new data mining technology. Interval number is a most important type of symbolic data. An interval number can be seen as an ordered pair composed of its center and radius, where the radius can be considered as its limit error. A factor analysis is firstly performed on the center sample data matrix, from which the center factor(More)
For the gas well with high H2S content,the process of sulfur deposition including the sulfur dissolution, precipitation, migration and deposition is a quite complex process. Relative to the solubility of sulfur under certain temperature and the pressure, the sulfur will be separated out when the content of sulfur in high sour gas is surpassed. Based on the(More)
As a new kind of data mining method, symbolic data analysis (SDA) can not only decrease the computational complexity of huge data, but also master the property of the sample integrally by data package technology. Interval number is one of the most important types of symbolic data. Previous studies assumed each individual to be uniformly distributed within(More)
Wind erosion is one of the most important factors influencing the stability and functions of typical grassland ecosystem and one of the main reasons causing grassland degradation. In order to understand the effects of the human disturbances to the ability of anti-wind erosion of the typical grasslands, a wind tunnel experiment was made and the wind erosion(More)
Converting degraded farmlands to forest or grass lands is the best approach to reduce the soil erosion, the Loess Plateau is faced with most serious ecological disaster. Loess Plateau located in the arid and semi-arid regions is a fragile region with the characteristics of little precipitation and intensive evapotranspiration. Therefore, water is the most(More)
Integrated watershed management based on aquatic ecosystems has been increasingly acknowledged. Such a change in the philosophy of water environment management requires recognizing the carrying capacity of aquatic ecosystems for human society from a more general perspective. The concept of the water ecological carrying capacity is therefore put forward,(More)
Salt marshes perform important ecosystem functions in carbon, nitrogen and phosphorus recycling. The plant biomass, content and pools of C, N and P were measured seasonally in three marsh species Phragmites australis, Spartina alterniflora and Scirpus mariquezer in Hangzhou Bay coastal wetland for the dynamics of C, N and P storage. The results showed that(More)
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