查询词典 spectrum

Experimental investigation of modulation transfer spectrum of cesium D2 line.

调制转移光谱线型的理论计算。

Objective To study the change tendency of air pollutants in Shenzhen, China in 2002-2005, further, to explore the relationship between disease spectrum and air pollution.

目的 分析深圳市2002-2005年空气污染物浓度的动态变化，为进一步研究疾病谱的改变与环境因素变化的相关关系打下基础。

This is based on the feature of changelessness of the intensity contour in the Fourier spectrum plane while object plane is moved in Fourier transform system.

根据傅里叶变换系统中物面平移其频谱面上光强分布不变的特点，提出一种利用二次傅里叶变换实现CCD精密定焦的方法。

A method of decoding encoded channelization code set information to determine the number of multicodes and the code offset in spread spectrum data transmission.

一种对信道化代码集信息解码以确定扩频数据传输中的多代码数目和代码偏移的方法。

Aiming at the project request, the paper firstly introduces the theory of Frequency Hopping Communication, the theory of sampling and the principle of spectrum analysis using discrete Fourier transform, then combined with the characteristic and superiority of FPGA designs a channelizing detection method for the carrier frequency in Ultrashort Frequency Hopping signal based on FPGA.

然后结合现代可编程器件FPGA的特点与优势，设计了一种基于FPGA技术的信道化电子侦察方案。

With the multiple spectrum character of the ultrasonic generator, an impedance model of ultrasonic transducer under the triple frequency harmonic is built.

本文利用超声电源的多频谱特性，推导出超声换能器在谐振频率三次谐波下的阻抗模型。

By analyzing the changes of spectrum of the characteristic functional groups, the mechanism and process of synthesis reaction were discussed.

研究结果表明合成反应初期是一个物理化学反应过程；在反应过程中目标产物存在一个最低点区域，在特征官能团上"枝接"其他官能团时，应有效地避免该反应时间区域。

Machine tool ; Cutting chatter ; Time-varying system ; AR model spectrum ; Modal damping ratio ; Characteristic root

机床；切削颤振；时变系统； AR模型谱；模态阻尼率；特征根

The models have been applied to an investigation on the chatter in a type Mx-4 lathe. An in-depth study has been made on the AR spectrum, the chatter modal damping ratio and the characteristic root of a time-varying system.

文中对时变金属切削过程颤振的AR谱特性、颤振模态的阻尼率、时变系统的特征根这三个方面都进行了深入的研究，指出了时变金属切削过程颤振的特点，提出了颤振状态下的机床切削系统仍然是稳定系统的观点。

Some characteristic peaks in Raman spectrum have been pointed out.

简单指出了拉曼光谱中的几个特征峰。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷