Aiming at this problem,the concept of the second order power spectrum was proposed based on the characteristic of the amplitude tune with pe- riodical notch spectrum in thin layer and theoretically researched.
为此,从薄层振幅调谐具有周期性陷频谱特征出发,提出了二阶功率谱的概念,从理论上对薄层的二阶功率谱特征进行了研究,建立了薄层厚度与二阶功率谱极大值之间的对应关系,给出了利用二阶功率谱进行薄层厚度预测的理论依据和方法,即根据薄层厚度和二阶功率谱的能量关系制作二阶功率谱图,图上强能量团对应的时间即为薄层时间厚度。
The new method can determine the tuning amplitude and frequency directly in terms of the amplitude changes or amplitude envelope in the frequency pision sections.
采用“接近零相位子波”的小波函数作为基本小波 ,通过分频扫描可以以较高的分辨率检测出薄层的结构 ,并可直接根据各分频剖面振幅或者振幅包络的变化 ,确定调谐振幅和频率 ,从而估算出薄层的厚度 。
Using the 10th International Geomagnetic Reference Field(IGRF) models,the latitudinal distribution of harmonic amplitude and its time-variation of geomagnetic potential are investigated.
利用第10代国际参考地磁场模型(IGRF)的资料,研究了地磁位的谐波振幅的纬度分布及其时间变化。
Further Study on Characteristics of Long-Term and Medium-Term Variations of Geomagnetic Harmonic Wave Amplitude Ratios before Moderate or Strong Earthquakes
地磁谐波振幅比异常特征的进一步研究及定性解释
Calculation methods for the dynamic characteristics of rubber isolators under small amplitude harmonic displacement excitations
小振幅谐波位移激励下橡胶减振元件动态特性计算方法的研究
digitally synthesized amplitude filter
数字综合振幅滤波器
reduce the amplitude (of oscillations or waves).
减少摆动或波浪的振幅。
a circuit that limits the amplitude of a waveform.
限制波形振幅的线路。
Partial Wave Analysis of J/ψ→γK(?);
J/ψ→γK（？）的分波振幅分析
Partial Wave Analysis of J/Ψ→γK～*(?)～*;
J/Ψ→γK～*（？）～*的分波振幅分析
seismometer resonant frequency
地震检波器谐振频率
dielectric materials for microwave resonator
微波谐振器介质材料
standing wave linear resonance accelerator
驻波线性谐振加速器
Experimental generation of bright green light in amplitude_squeezed state via extracavity frequency doubler
用外腔谐振倍频产生明亮绿光振幅压缩态光场
The ratio of the amplitudes of the reflected and incident waves is termed the reflectivity or reflection coefficient.
反射波振幅与入射波振幅的比率称作反射率或反射系数。
The size of the vibrations depends on the strength of the gravitational wave.
振动的幅度依赖于引力波的强度。
vary the frequency, amplitude, phase, or other characteristic of (electromagnetic waves).
改变（电波）频率、振幅、状态或其它特征。
Sound waves are measured by their amplitude.
声波是根据其振幅来测量的.
The imposition of a curved phase characteristic reduces the peak amplitude of the waveform.
曲线形相位特性减小了波形振幅峰值。
Here the brainwaves are of the greatest amplitude and slowest frequency.
它是振幅最大、频率最低的一种脑电波。
Electrophysiologic Study of Right Atrial Wave Amplitude in Patients with Paroxysmal Atrial Fibrillation;
阵发性房颤时右心房f波振幅的研究