In this paper,the strip-like horn is separated into several equal portions,and each portion can be viewed as a compound stepped type horn,and its fre-quency equation is derived by the transmission matrix method.
将长条形焊头通过合理开槽划分为若干相等的单元,每个单元可作为复合阶梯形变幅杆来处理,用传递矩阵法得出了焊头单元的频率方程,为长条形开槽焊头的设计提供了理论依据。
The results showed that for TN,TP,CODMn,NH4+-N and the transparency the sequence of treating effect is basically: strip aquatic mats> AquaMats> artificial aquatic mat>plant carpet>the control;in it the removal rates of TN,TP,CODMn by strip aquatic mats were 97.
结果表明:对TN、TP、CODMn、NH4+-N、透明度等指标的处理效果顺序基本为条形水草>AquaMats>人工水草>植物地毯>对照组,其中条形水草对TN、TP、CODMn的去除率分别为97。