Cai Xia Dong

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In order to investigate the effects of homogeneous and localized supply of different nitrogen forms (nitrate, NO3 − vs ammonium, NH4 +) on the growth of tomato seedlings, root morphology and six cytokinin (CTK) fractions in xylem sap were analyzed. Whole roots were supplied with different ratios of NO3 − to NH4 + (100:0, as 100-0NA; 75:25, as 75-25NA;(More)
Spatial neighborhood relation detecting is the basis of organization, query, analysis and reasoning of spatial data. For the spatial neighborhood relations of the geographic entities are contained in the Delaunay triangulation, in this paper, the spatial neighborhood relations between multi-factors (including points, lines and polygons) are intelligently(More)
With the purpose to investigate the effect of heating temperature on the visible-light photocatalytic activities of carbon-doped TiO<inf>2</inf>, TiO<inf>2</inf> photocatalysts doped with different amounts of carbon were synthesized through heating the dried gel at different temperatures from 70 to 350 &#x00B0;C. XRD, XPS, UV-Vis analysis were used to(More)
In order to study the process of doping carbon into TiO<inf>2</inf> without external carbon precursor, photocatalysts with different amount of doped carbon were prepared by heating the xerogel obtained by simple sol-gel method at different temperatures. After fitting and analyzing the peaks of XPS spectra of N 1s, C 1s, Ti 2p, O 1s, it is found that the(More)
Urban fringe is a special area with interaction of urban and rural areas. So far how to identify urban fringe automatically from urban area and rural areas is one of the major fields that urban geography concern. In this paper, remote sensing images of Nanjing district in 2003 is the calculating base. At the same time, the ERDAS Imagine and Visual C++(More)
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