Direct Digital Synthesizer (DDS) has the advantages of high frequency resolution, rapid frequency change rate and low phase noise.
直接数字频率合成器dds具有极高的分辨率、频率转换速度快、相位噪声低等优点。
Derection and power spectrum of an incident plane wave are estimated by evaluating amplitude and rate of phase change of the corresponding sinusoidal wave.
从相应正弦波求得的振幅和相位变化率可以检测平面波的入射方向和功率谱。
The relation of bubble nucleation rate and degree of superheat, and phase change driving force and phenomenological coefficient, were analyzed based on phenomenological theory, respectively.
基于唯象理论，分析了汽泡核化速率和过热度以及相变驱动力和唯象系数的关系。
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