查询词典 spectrum

modulation is the transmission of information to be loaded onto a high-frequency signal in the process.amplitude modulation using signal to control the rate of carrier,with its linear modulation signal changes,and maintain the same carrier frequency.in the amplitude modulation,in accordance with the strength of signals in the spectrum of different components,it is divided into ordinary am (amplitude modulation standard am),with inhibition of bilateral carrier am,the carrier single sideband suppression am.the main difference is the different methods and structure of the spectrum.

摘 要：调制是将要传送的信息装载到某一高频信号上去的过程。振幅调制是用调制信号去控制载波的幅度，使其随调制信号线性变化，而保持载波的频率不变。在幅度调制中，根据已调信号的频谱分量不同，分为普通调幅、抑制载波的双边带调幅、抑制载波的单边带调幅。它们的主要区别是产生的方法和频谱结构不同。

And Technology, Changchun 130022, ChinaAbstract : The optical design of wide spectrum WFOV LLL collimating lens and the structure of lens set are introduced. The correction of the secondary spectrum of the WFOV LLL collimating lens are described emphatically.

介绍宽光谱大视场微光准直镜的光学设计和镜组结构方案，侧重叙述大视场微光准直镜的二级光谱校正方法。

Secondly, the structure and the characteristics were analyzed by X-ray diffraction, TG-DAT, infrared spectrum and Raman spectrum.

其次，通过XRD分析、X射线荧光光谱分析、热分析和晶体振动光谱对晶体的结构和成分进行了分析。

The complexes have been characterized by IR spectrum , UV spectrum and X-ray diffraction.

铜的氨基酸配合物具有催化超氧阴离子自由基O_2~

In the second part, we analyze the problems in dealing with the formation of magnetic fields and injection of particles under the standard model of gamma-ray burst afterglows, and discuss the evolution of relativistic electrons' energy spectrum therein and their radiation spectrum and light curves.

在本论文的后半部分，我们分析了伽玛暴余辉的标准模型在处理激波中磁场形成及粒子注入方面存在的问题，讨论了其中相对论性电子能谱的演化及其辐射谱和光变曲线。

The result showed that epidemic strain of various samples had variation, and antibacterial spectrum of the antibacterials distinguished anlage antibacterial spectrum.

第三，以药物为依据，观察各类抗菌药物的抗菌谱变化。结果：各标本流行菌株有所变化，各抗菌药物的抗菌谱与其原始抗菌谱有所不同。

The higher the blackbody temperature is, the more the blue spectrum is and the less the red spectrum is.

黑体的温度越高，光谱中的蓝色成分则越多，而红色的成分则越少。

The influence of calibration constant K,spectrum region selection and spectrum prepro- cessing on the veracity of a calibration model when establishing a model for rapidly determining aroma composition in naphtha by near-infrared spectroscopy are analyzed.

在采用近红外光谱建立石脑油芳烃含量校正模型的过程中，分析讨论了校正系数K值、光谱区域选取及光谱预处理方法对校正模型准确性的影响。

Then based on CWMS, we propose a new method to enhance the resolution of seismic traces. Firstly, we divide the seismic signal into proper segments by Gabor molecule-windows adaptive to the signal, where each segment is regarded stationary, and then transform it into the Gabor domain. Secondly, we deal with the amplitude spectrum for each segment to expand the frequency band of the spectrum in the Gabor domain. Finally, taking inverse Gabor transform on modified time-frequency coefficients, we get the high-resolution signal.

然后基于变子波模型，提出了一种新的提高地震记录分辨率的方法：第一步，用自适应于地震记录的Gabor分子窗把地震记录恰当地划分成若干片断，每段内信号近似平稳，然后将地震记录变换到时间-频率域；第二步，在变换域对每个分子窗内信号的振幅谱进行处理以拓宽频带；最后把处理后的时间-频率域函数反变换回时间域得到提高分辨率后的结果。

However, due to the structure of alkali metal atoms in different electronic transition energy when the change is not the same as on the different wavelengths of light, the color reaction from the flame in the experiment see the special flame color, the color spectrum is the spectrum.

但由于碱金属的原子结构不同，电子跃迁时能量的变化就不相同，就发出不同波长的光，，从焰色反应的实验里所看到的特殊焰色，就是光谱谱线的颜色。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。