2003年新年前夕,沈阳市环境监测中心站承担的“沈阳城市生态环境与可持续发展研究”课题顺利通过了由沈阳市科技局组织的科学技术成果鉴定。该课题针对沈阳生态环境的主要特征,以复合生态系统理论为指导,建立起由4个层次、
The studied agriculture\|pasture interlacing zone has its specific natural conditions, at which the natural systems are unstable, their self\|regulation capability is low and the equilibrium is easily
The study on the oasis corridor landscape is a new hotspot in the ecological environment research in the arid regions. In oasis, main corridor landscape types include river, ditch, shelterbelt and roa
Due to relatively strong human activities in the hilly area of Loess Plateau, the natural vegetation has been destroyed, and landscape pattern based on agricultural land matrix was land use mosaic com
针对锅炉行业产品设计需要,依据蛇形管设计规则,采用Visual C++5.0为开发工具,设计了蛇形管CAD系统.系统采用DXF文件接口技术实现与AutoCAD的数据交换.实践应用表明,该系统功能完备,可靠性、稳定性好,适用,方便.