The main efforts and results of this dissertation can be summarized as follows : 1 、 the methods that single point source confronts arm ’ s attack are studied 全论文主要分为三个部分:一、单点源诱偏系统抗反辐射导弹攻击的方法研究。
With strengthening control of point source pollution , agricultural non - point source pollution will be the main pollution source to the three - gorge reservoir area 随着点源污染的有效治理，农业面源污染将成为三峡库区水体的最主要污染源。
Focus size of large earthquakes is considerable , and fault rupture attitudes may have great influence upon the seismic hazard of a site which is near the source 但对于较大震级的地震，仍然采用点源或线源模型来描述潜在震源显然是不合理的。
Potential sources are simplified as point sources or linear sources in current probabilistic seismic hazard analysis ( psha ) methods 摘要目前国内外常用的概率地震危险性分析方法中，一般把未来可能发生的地震震源（潜在震源）简化为点源或者是线源。
2 . the condition of prs tracking the stronger source between dual sources is given quantitatively , this condition is of great value to designing a real prs . 3 定量地给出了在一定的置信水平和测角精度的要求下，为分辨出两点源doa ， prs应满足的条件。
This approach is mathematically easier to deal with , yet it gives the same directivity in the azmuthal plane . however an actual array always have finite dimensions 最早的线性阵，为了分析计算方便，相控阵是由若干个点源均匀分布在同一直线上构成的。
The reasonable utilization of ditch wetlands for their capacity of retention , transformation and absorbtion of nutrients can be an effective tool in reducing 科学合理地利用沟渠湿地的截留、转化、吸收等能力，可有效降解非点源污染物，并取得很好的经济效益。
One has to set up a point source in the far field and rotate the system in the fan beam direction . the difficulty is mainly due to the incomplete test environment 但是，测量g矩阵不是一件很容易的工作，必须旋转仪器扫描远场的点源得到，测试条件要求比较苛刻。
Rainfall - runoff simulation is the very important technique for soil erosion , non - point source pollution , surface water balance calculation and some other study fields 降雨径流模拟是土壤侵蚀、非点源污染、地表水量平衡计算等众多研究领域的非常重要的技术手段。
