查询词典 modulation

The QAM modulation based on single chip computer and A/D converter is finally presented.

最后分析了采用单片机和D/A变换器实现的QAM调制解调方法。

Absolute frequency stabilization of diode lasers of wavelength nm grade are reported using the modulation transfer method .

阐述了利用调节及转换技术稳定激光二极管发射器的频率，这种发射器可以发射纳米波长的激光。

Molecular iodine has rich strong absorption lines near 532 nm that can provide the absolute references for frequency stabilization. A monolith solid laser was tuned at the spectrum of transition R (56) 32-0 of iodine molecule with new modulation frequency 375 kHz.

使用532 nm单块固体激光器，在375 kHz新的调制频率下，利用调制转移技术，将激光频率调谐到127I2的R(56)32-0跃迁的吸收谱线，并观察到该吸收谱线相应的15条超精细结构分量。

When the backing is a double-shell, the water layer causes obvious modulation phenomenon to the absorption coefficient curve.

背衬为双层壳体时，水层对吸声覆盖层的吸声系数曲线有明显的调制现象。

Frequency modulation ; magnetic rotation spectroscopy ; absorption line shape ; dispersion line shape.

频率调制；磁旋转光谱技术；吸收线型；色散线型

ABSTRACT Communication signals travel in space with different modulation formats.

空间传播的通信信号采用了不同的调制方式。

An expression for acoustic wave amplitude as a function of modulation frequency and relaxation time has been derived.

推导了光声信号振幅与入射光调制频率和样品分子振动－平动弛豫时间的函数关系。

To find the modulation effect of Actinomycin D on the expression of cFLIP_L in colorectal cancer and subsequent effect on the apoptosis in cancer cells.

观察RNA合成抑制剂放线菌素D对大肠癌细胞cFLIP_L表达的调节并探讨cFLIP在大肠癌细胞凋亡中的作用。

The common equation of the evolution of spectrum caused by selfphase modulationis presented, which is the convolution of action spectrum and chirped spectrum caused by selfphase modulation when carrier frequency is single.

给出了由自相位调制引起的频谱演变的普遍表示，即单载频脉冲的SPM引起的啁啾频谱与光源的频谱的卷积，通过数值计算给出从相干脉冲到非相干脉冲的频谱演变规律。

When the adaptive modulation is applied in the OFDM system, there are lots of problems to be solved.

本文围绕自适应调制技术在OFDM系统中的应用涉及的技术问题展开研究。

Chimborazo and Cotopaxi, took me by the hand.

越过琴博腊索山和科托帕克西山。

This car is in a good condition.

这辆车的状况很好。