原子钟为整个控制系统提供振动频率基准,其振动频率的平稳性关系到整个系统的精确性,因此分析原子钟频率信号的平稳性具有重要意义......

This paper made use of approximate entropy (ApEn) to evaluate the complexities of frequency-hopping (FH) sequences. By d......

为研究热声不稳定的自激机理，搭建了mjke型预混燃烧器热声不稳定试验台架，研究了其热声不稳定起振过程的频率特性。Rijke型燃烧器为......

By the flexible redefinition of frequency-occupation and frequency-collision event, the frequency-collision probability ......