查询词典 spectrum

After the mathematic model of spatial spectrum analysis was introduced, interharmonic signals can be transformed to spatial signals received by linear sensor array through Euler\'s formula or Hilbert transform. The number of sinusoidal components of the interharmonic parametric model was corresponding to the source number of transformed spatial signals, and the frequencies of sinusoidal components were corresponding to that of transformed spatial signals.

3介绍了空间谱分析的数学模型，证明了间谐波信号经欧拉公式或希尔伯特变换后可以转变为空间线性阵列接收的空域信号，正弦成分数对应空域信号源数，正弦成分频率对应空域信号频率。

Photoluminescence spectrum of the final product exhibited strong luminescence from europium ion.

含有稀土配合物的微球展现出了Eu〓的荧光特征峰，具有良好的荧光性能。

In this thesis, we study some basic properties of the giant vortex, including ground state energy and excitation spectrum.

在这篇论文中，我们研究这种巨形漩涡的一些基本性质，包括它的基态能量和激发能阶。

The gain, the average energy of excitation spectrum, is quantized using 5 bits non-uniform scalar quantizer.

增益即激励谱的平均能量用5比特非均匀标量量化。

Based on expatiation of Frequency-Hopping Spread Spectrum and OFDM technical theory, synchronous method and performance also analyzed respectively.

在文中首先对跳频技术及OFDM技术理论阐述的基础上，也对各自的同步方法及性能进行分析。

Based on a series of signal process and noise source identification techniques, especially the major noise source identification methods, such as expurgation method, sound intensity analysis, spectrum analysis vibro-acoustic correlation analysis and so on, the pass-by noise control of SC7080A and SC6360B are studied in detail. By the roadway and dais experiments, the major noise and radiating parts are identified and some economical controlling methods are made. For the SC7080A, to control the emissing noise from the intake and shell vibration of air cleaner, a intake muffler is installed between the air cleaner and intake valve. Based on the theory of Helmholtz resonator, One three-parallel-connected resonant silencer is designed and trial-manufactured. For the SC6360B, the attenuation performance of exhaust muffler in high frequency region is improved. To reduce the vibration noise of shell part, the structure of oil sump tank, exhaust manifold shield and exhaust manifold shield are analyzed and improved. At the same time, some measures, such as sound absorption, sound insulation, are taken to reduce the noise of engine surface emissivity and a sound shield is designed.

本文首先综述了目前国内外汽车加速噪声控制的现状、主要方法和技术措施，在此基础上，结合SC7080A和SC6350B汽车的车外加速噪声水平及现状，综合运用分别运行法、声强法、频谱分析法、声振相干函数法等现代噪声源识别方法，对SC7080A和SC6360B汽车进行了准确详细的车外加速噪声源识别并提出了经济可行的控制方案，针对SC7080A，主要在空气滤清器和进气阀门之间的进气管道上加装进气消声器，抑制空气滤清器壳体表面和进气口两处的噪声辐射，根据Helmholtz共振腔原理设计了三腔并联旁支型共振消声器，并进行了工程化设计和试制；针对SC6360B，主要改善了排气消声器在高频段的消声性能，对罩壳类零件进行了结构改进，降低了其表面噪声的辐射，并对发动机舱进行了吸声、隔声处理，设计了发动机隔声罩。

By scanning electron microscope and instrument of energy spectrum analysis, the external surface, composition, microstructure of specimens were studied and analyzed.

将几种常见金属与做过阳极氧化处理的1Cr18Ni9Ti进行反应器现场挂片试验。

In order to get accurate spectrum estimation result, extrapolation is necessary.

为了得到正确的谱估计，必须对有限长的信号外推得到无限长的信号。

If the fluid comes back an exudate,get him on broad-spectrum antibiotics.

如果积液是渗出液用广谱抗生素

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。

You can do some assertiveness training.

你可以进行一些自信训练。

We were well on the path to making a rear-wheel-drive global platform," says Mays."

我们正致力于建立一个后轮驱动的平台，"Mays这样说道。"