D . c hanna , r . m percival . continuous - wave oscillation of a monomode ytterbium - doped fibre laser [ j ] . electronics letters , 1988 , 24 ( 17 ) : 1111 - 1113 张强.掺镱双包层光纤激光器实验研究及圆盘光纤激光器设计[ d ] .硕士学位论文, 2003年,天津大学
( 4 ) the frequency modulation effects of positive dipole ( unipole ) forcing source on lfo is stronger than negative dipole ( unipole ) , and the wave oscillation quicken evidently ( 4 )正偶(单)极强迫源对大气低频振荡的调制作用强于负偶(单)极,波动振荡明显加快。
3 . according to the shape of isi scatter map , isi slow wave oscillation can be divided into 5 basic types : v , reversal h , integer multiple , diffusive and compound patterns 根据78例h慢波振荡过程在isi散点图上显示的形状,可分为5种基本型式: v形,倒fi形,整数倍形,弥散形和复合形。
This isi series oscillation has following characters : ( 1 ) long term cycle duration , whose duration of most oscillations ranged from 3 0 - 120ms , so we called it slow wave oscillation ; ( 2 ) large amplitude of oscillation , the minimum isi is about 2ms while the maximum is beyond 40ms , which suggested that the firing frequency vary from several tens to hundred hz ; ( 3 ) abrupt turn always occurs during the continuous change in isi , this turn is called inflexion temporarily 该振荡波有下述特征: ( 1 )振荡周期较长,多数在30 ? 120s范围,故称慢波振荡; ( 2 )振荡幅度较大,其isi振荡最小值在zms左右,最大值可达40ms ,表明放电频率可在几十到几百k范围内变动; ( 3 )在isi连续变化过程中往往出现突然转折,暂称其为拐点。
( 6 ) the results of the stream function field of quasi - resonance three waves transforming with time evolving make sure further that the low - frequency oscillation exists in extratropical latitude , which has greater corresponding relationship with the wave oscillation obtained from the combination of the basic flow , the number of three waves and amplitude ( 6 )在准共振三波流函数场随时间变化的试验结果中,进一步证实了中高纬大气存在较好的低频振荡,且与相应的基流、三波波数和振幅组合所得的波动振荡有较好的对应关系。