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Remote sensing and GIS have been widely employed to study temporal and spatial urban land use changes in southern and southeastern China. However, few studies have been conducted in northeastern regions. This study analyzed land use change and spatial patterns of urban expansion in the metropolitan area of Jilin City, located on the extension of Changbai(More)
Satellite communication system need very wide band antenna. But the narrow bandwidth of a microstrip antenna is one of the important features that restrict its wide usage. A simple and practical design method for the design of broad-band microstrip antennas is presented in this paper. Utilizing this design technique, several two-layer microstrip antennas(More)
The Continuously Operating Reference Station (CORS) technique has been widely applied in land resource management, surveying, mapping, deformation monitoring, precise navigation, etc. This article analyzed the positioning method using EGM2008 and CORS of Jilin Province, China. The vertical transformation of EGM2008 from WGS84 to China's CGCS2000 datum and(More)
Veronica subsect. Canae constitutes a group of approximately 22 species, mostly endemic to China. The clade is an early branching taxon in the earliest branching subgenus of Veronica and its phylogenetic relationships are therefore relevant for understanding evolutionary patterns in the genus as a whole. In the present study, we aim to confirm the(More)
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