查询词典 spectrum analysis

Discrete fast Fourier transform has been widely applied to signal spectral analysis and can figure out the entire bandwidth spectrum of a signal.

离散快速傅里叶变换算法在频谱分析中得到了广泛的应用，这种算法得到的计算结果是在整个频段上的频谱信息。

The error analysis and correct method of discrete spectrum.

离散频谱误差分析与校正方法。

By the analysis of stress, crack characteristics, cross section metallography, scanning electrometry microscopy, energy spectrum micro-area as well as material quality of top hair clip pipe of Primary reformer, finds out the reason for top hair clip pipe cracking is stress corrosion cracking, and puts forward defending measures.

通过对一段转化炉上发夹管受力分析、裂纹特征、断面金相、电镜扫描、微区能谱、材质等分析，找出了上发夹管开裂的原因是应力腐蚀断裂，提出防护措施。

Based on the statistical analysis, a new equivalent linearization method to estimate input energy spectrum is proposed.

根据能量谱分析结果的统计计算，建议了一种新的适用于弹塑性SDOF系统能量谱计算的等效线性化方法。

Based on the concept of antenna near-field measurement and the theory of plane wave spectrum, the theory of plane near-field measurement and error analysis are introduced, two errors of plane radiation near-field measurement are discussed in detail: the probe positioning error and the truncation error of finite scanning.

本文从天线近场测量的基本概念出发，以平面波谱理论为基础，介绍了平面近场测量理论及其误差分析方法。

The results of the study are as follows: 1 Wigner′s time-frequency analysis of the geoacoustic signal is of a clear physical meaning, which can be described as the energy distribution in time and frequency domain, and can reveal the frequency spectrum essential features of non-stationary geoacoustic signal.

研究表明：1。地声信号的Wigner时-频分析具有明确的物理意义，它可表述为信号在时间和频率域上的能量分布，揭示了非稳态地声信号频谱的本质特征。

In addition, the comparative analysis of ATR spectrum of healthy skin with psoriasis exuviae is investigated.

此外，对人体健康皮肤和患银屑病皮肤的 ATR 红外光谱进行了对比分析。

As a traditional method, the system based on Fourier analysis and frequency spectrum analyzer can not be used to test 1/f noise timely, fast and accurately.

传统基于傅立叶分析和频谱分析仪的微弱信号检测方法无法对1/f噪声进行实时、高速、精确的测量与分析。

The paper focuses on the design and realization of direct frequency and false random yard and proposes the FPGA hardware design of the model based on the analysis and study of the theory of spread spectrum communication,the whole structure of the signal source and false random yard.

文中以直接频率合成和伪随机码的设计与实现为中心，对扩频通信的基本理论、信号源的总体结构、伪随机码等问题进行了深入的分析和研究，并给出了模块的FPGA硬件实现方案。

At present, ferrous spectrum technology is a kind of wear monitoring technology which is widely used in oil-hydraulic grain analysis.

摘要目前，铁谱技术是一种广泛使用的一项油液磨粒分析的磨损监控技术。

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％。