查询词典 spectrum distribution

Based on the measured surface structure data, an array model was built, and the effect on diffractive light distribution in spectrum plane with different bendings was calculated by Matlab software.

利用实测的表面结构数据建立了阵列模型，利用Matlab软件计算了不同弯曲度对频谱面上衍射光强的分布影响，得到了弯曲度与对比度之间的关系。

The irradiation products was transported into a special source box filled with activated charcoal at liquid nitrogen temperature. When the equilibrium distribution of gas Xe in the source box is achieved, the γ-spectrum was continuously acquired.

在反应堆中对盛装在玻璃管中的普通氙辐照96h，经一定时间冷却后，将辐照产物吸附到处于液氮温度下的特制源盒中，20 min后，待Xe气体在源盒中达到均匀分布再进行了能谱测量，以获得127Xe的准确活度值。

Considering to the fatigue calendar characteristics of materials, the sequence effects of loading spectrum and the mechanical behavior of cyclic hardening/softening of metals, the cumulative fatigue damage is proved to have character of Markov process. Also, the distribution of the cumulative fatigue damage and its critical value is deduced to vary with the pre-exposure calendar time of materials.

考虑载荷次序效应、材料循环硬化/软化效应及材料的大气环境腐蚀老化效应，论证了疲劳累积损伤随机过程的Markov性，及疲劳累积损伤的正态分布特性，同时证明了临界累积损伤的统计特性随日历时间的变化关系，在此基础上建立了一新的全动态疲劳累积损伤统计干涉模型。

Time-Frequency analysis method is applied to the analysis of PEC signals with the aim of discriminating the occurrence of corrosion from the simultaneous variations of lift-off, smoothed pseudo Wigner-Ville distribution is used to get the signal spectrum map. The method of extracting the lowest energy area as the classification eigenvalue is proposed, and a good classification result is acquired.

采用时频分析的方法对同时出现腐蚀缺陷和提离变化的情况进行了识别，利用平滑的伪Wigner-Ville分布得到了信号的谱图，提出了提取谱图中最低能量区域面积作为特征量进行识别的方法，取得了较好的识别效果。

Based on Wavelet Packet Analysis and Smoothed Pseudo Wigner-Ville Distribution, the experiment data is time-frequency analyzed. The experimental results indicate that the amplitude of the laser-induced acoustic waves increases with the laser energy; the frequency coverage is from 0 to 150 KHz, and in the meantime there is a peak located at about 25 KHz. In addition, the spectrum and the peak of frequency are basically stable in spite of the change of laser energy and target texture.

从基本的空泡动力学理论出发，推导了空泡各特征参量之间的关系，进而对空泡动力学模型进行了修正；采用有限差分法对空泡脉动进行数值模拟，得到了空泡脉动特性随液体粘性、空泡含气量、表面张力以及可压缩性的变化规律；实验上采用光偏转测试装置探测了激光空泡脉动以及空泡溃灭的细节过程，进而分析了液体粘性和作用激光能量对空泡脉动周期、泡半径及泡能等特征参数的影响。

Too much emphasis has been laid on thephase coherence detection using the arithmetics of auto-correlation in time domain,spectrum analysis in frequency domain and feature extraction of intra-pulse modulatedsignals employing the methods of quadrature in time domain、Short Time FourierTransform、Wigner-Ville Distribution and Radon-Wigner Transform.

本文详细介绍了脉冲多普勒雷达的原理及其信号特征、相参性原理、脉内调制信号、时频分析理论和模式识别理论等，重点讨论了利用时域自相关法和频域谱线分析法进行相位相参性的检测；详细分析了脉内调制特征提取的几种方法，主要包括时域正交、短时傅立叶变换、维格纳分布和 Radon-Wigner 变换。

According to the observation of the number concentration spectrum and the mass concentration of atmospheric aerosol, TSP and its particle size distribution,micrometeorology,and the solar spectroscopic radiation,even the neutron activation treatment of sand dust samples in Helan Mountainous area, the formation law of sandstrom, dust and sand blowing weather and the characteristics of climatic variation in this area and the influence of Helan Mountain are counted and analysed.

利用贺兰山地区沙尘暴历史资料和综合观测资料，对大气背景、浮尘、扬沙和沙尘暴发生期间的大气气溶胶数浓度谱、质量谱、大气总悬浮颗粒及粒径分布、微气象、分光日射观测以及沙尘样品进行中子活化处理，分析了该地区浮尘、扬沙和沙尘暴形成规律，气候变化特征和贺兰山的影响。

The model considers as many factors as possible, including nonuniform distribution of photon intensity and carrier density along active region, gain spectral dispersion, spontaneous emission spectrum and facet reflectivity, and is applicable under the condition that the pulse width of injecting signal is wider than 10 picoseconds. It provides a convenient and effective theoretical platform for SOA dynamic characteristic study.

该模型考虑光子密度和载流子浓度沿有源区的非均匀分布、增益谱色散性、自发辐射噪声谱和端面反射率，适用于脉冲宽度高于10ps的信号输入的情况，为后续研究SOA动态特性提供了方便而有效的理论验证平台。

The results showed that the slope of the density distribution of Cherenkov lights produced by Fe was obviously flatter than those produced by γ and p, if energy of the primaries was in the range around the"knee" of the energy spectrum.

结果表明，在初级宇宙线的能量处于能谱的&膝&区附近时，Fe簇射产生的契仑柯夫光强分布的变化率总是比γ和p簇射的要小。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。