从谱分析结果判断，年降水量具有20年的主振荡周期和3.3年、2.2年的次周期，并出现与太阳黑子变化反位相的特征。
Spectrum analysis is also conducted with the result that the significant period is about 20 years and the sub-period are 2.2 and 3.3 years.
结合双包层掺镱光纤(YDCF)和主振荡功率放大(MOPA)技术，利用熔融拉锥的光纤侧面耦合器，设计和实验研究了全光纤结构的脉冲光纤放大器。
Using the side-pumped coupler made from fused tapered fiber, the Yb-doped double-cladding fiber (YDCF) master oscillation power amplification (MOPA) with all-fiber structure is experimentally studied.
结论与先前的研究相同，虽然先前的研究分析的是尚未将前驱和主波分离的光子，它们显示出了一个振荡结构。
The results agree with previous studies that have analyzed single photons whose precursor and main wave form have not been separated, which have reported an oscillatory structure.
这些装置没有反馈管来控制主喷流，也没有射流的附壁效应。它们的结构很简单可以自激振荡。
These devices have neither feedback pipes to control the main jet nor wall attachment effect of the jet on them.
指出武汉市主汛期降水存在40年、25年、10年、4—7年左右的周期振荡，并由降水的周期性推知本世纪初武汉市汛期将进入下一个少雨时段。
The main period about 40,25,10 and 4-7 years are found. Based on this, we can forecast the lack of rainfall in Wuhan city in initial stages of this century.
指出武汉市主汛期降水存在40年、25年、10年、4—7年左右的周期振荡，并由降水的周期性推知本世纪初武汉市汛期将进入下一个少雨时段。
The main period about 40,25,10 and 4-7 years are found. Based on this, we can forecast the lack of rainfall in Wuhan city in initial stages of this century.
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