查询词典 band spectrum

The working load of engin e in plowing can be taken for stable and normal random load whose power spectrum peak value is below 2 Hz. The working load of engine in rototilling contains bo th periodic element whose fundamental frequency is rotating speed of the blade s haft and normal random load of which the parts of energy centers in fundamental frequency and others are distributed over wider frequency band.

证实了犁耕作业发动机的载荷可以认为是平稳的正态分布的随机载荷，其功率谱曲线的谱峰在低于2 Hz处；旋耕作业发动机的载荷是兼有随机成分和周期成分的动态载荷，其中周期谐波的基频为刀轴转速，随机成分一部分能量集中于基频以内，部分分布于较宽频率范围。

The photoluminescence spectrum of the nanosaws showed stronger visible emission band as compared to undoped ZnO powder at room temperature.

纳米锯的光致发光谱表明，在室温下它有比不搀杂的纯氧化锌粉末更强的可见光发射带。

The photoluminescence spectrum of the heterostructured nanorotors showed stronger visible band emission as compared to pure ZnO powder at room temperature.

纳米转子的光致发光谱比不搀杂的纯氧化锌粉末有更强的可见光发射带。

The radio spectrum for UWB is divided into several band groups, with different worldwide regulations applying to the bands.

无线电频谱的UWB是分成几个波段的群体，不同的世界条例适用于带。

On the first subject, the phase approximation of image formation algorithms for UWB SAR operating on P band was discussed in detail. The methods to determine the consistent focusing swath width in Chirp Scaling algorithm using residual coupling phases and range spectrum characteristics were also proposed.

本论文以国防预研项目为背景，针对现有实测机载P波段UWB SAR数据成像处理中所面临的问题，围绕宽幅成像算法、运动补偿和图像干涉三个方面展开了深入研究，取得了有益的成果。

For instance took when frequency synthesizer, emphasizes is the switching time, the frequency spectrum purity, took when modem emphasizes is the ring circuit band width and so on.

比如作为频率合成器时，强调的是转换时间，频谱纯度，作为调制解调器时强调的是环路带宽等。

Program is divided into three parts: phase.m symbol of the baseband shaping pulse sequences, optional rectangular pulse, the square root raised cosine pulse and raised cosine pulse model.m-based procedures, completed a variety of base-band signal constellation mapping , pulse shaping and modulation command.m given spectrum shows a simple test.

程序分成三个部分：phase.m对基带码元序列进行脉冲成型，可选矩形脉冲，升余弦脉冲和平方根升余弦脉冲； model.m 为主程序，完成各种信号的基带星座图映射、脉冲成型和调制； command.m给出一个简单的频谱显示测试。

The signal components of interest in the interference frequency are also sunk while eliminating narrow band interference in direct sequence spread spectrum system by conventional NBI suppression techniques based on the estimator/subtracter in time domain, so the signal of interest is damnified inevitably.

传统的基于时域估计/相减的直接序列扩频系统窄带干扰抑制技术在对干扰陷波的同时，也将干扰频率处的信号分量陷去，不可避免地对有用信号产生损伤。

The following results are made from this research: Assessing data quality and band combination of different bands in line with geo-target features in desertification areas, and determining basic bands for desertification monitoring. And understanding and studying the spectral features and variation rules of geo-targets in the experimental area, raising that it is the basis of geo-targets information collection with imaging spectrometer data to understand spectral features and variation rules of geo-targets, realizing that in a great extent spectral-integrated-form-based classification method can remove the phenomenon of "different spectrum with same objects" resulted from reflection ratio curve translation because of the angle change among sensor, targets and observation direction, and the average and variance images can be introduced to solve the problem of two kinds of geo-target with similar spectral forms and much different values of whole reflectionratio. It is suggested that "red edge" range bands of vegetation, which has close relationship with vegetation cover and biomass, is the main characteristic bands and important basis for careful vegetation classification and quantitative retrieval, and pixel-based derivative spectral analysis is very useful for removing the effects of soil background values and quantitatively retrieving vegetation biomass and cover. The remote sense quantitative retrieval model is developed for main appraisable factors of desertification monitoring assessment with imaging spectrometer data and then the applicability of model is analyzed.

研究结果如下：首先针对荒漠化地区的地物特征，对高光谱数据不同波段的数据质量、波段组合进行了评价，提出了适用于荒漠化监测的基本波段选择集；初步了解和掌握了研究地区的地物光谱特性及变异规律，进一步明确了掌握地物光谱特征和变异规律是用成像光谱仪数据提取地物信息的基础；发现了基于光谱整体形状的分类方法在很大程度上能够消除由于传感器、地物目标观测方向之间的角度变化引起的反射率曲线整体平移的"同物异谱"现象，对于谱形相似而整体反射率的值相差较大的两类地物，通过引入均值和方差图像参与分类得到解决；研究还表明在植被"红边"范围内的波段是进行荒漠化监测的主要特征波段，这些波段与植被生物量和盖度都有密切的关系，是开展精细植被分类研究和植被定量反演的重要基础；像元的导数光谱分析可以消除土壤背景的影响，是进行植被生物量和盖度定量反演的有力工具；建立了荒漠化监测主要评价因子的定量反演模型，并分析了模型的适用性。

RESULTS The SOD activity had linear correlation with pH in the range of pH 2.2-8.0 when SOD concentration was fixed. The varication of activity after ultrosonication had linear correlcation with fluoresent intensity at 340 nm. With increase of uhtrosonic frequency, the microenviroment of tyrosine and tryptophan inside the SOD molecule was changed, then the balance of hydrophokicity and hydrophilicity inside the molecule was broken, this induced the blue shift of synchronous spectrum band and decrease of SOD activity.

结果 SOD浓度一定、pH2.2~8.0时，活性与其线性相关，超声后活性差值与340 nm荧光强度差值的线性相关；随着超声次数的增加，蛋白质SOD分子内部的酪氨酸、色氨酸所处的微环境被扰动，打破了分子内部的疏水和亲水平衡，使蛋白质的活性降低，在荧光检测中观察到普通荧光谱带蓝移，同步荧光的荧光峰位总体呈现峰位蓝移和强度下降。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。