采样

Nonuniform sampling can acquire signal of which the frequency exceeds the threshold in Nyquist theorem when the sample rate of analogue-to-digital device is lower than usual.

非均匀采样可以在对模数转化器件的采样频率要求较低的情况下，提取超出Nyquist采样定理限制的频率。

In this paper,the truncated error of trapezium methodis analyzed under ideal state of electrical power parameters,a sin function,when sampling digital measurement and the relationship between the error and the amount of sampling points is offered.

对电力参数的理想情况采样数字化测量的典型算法的截断误差进行了分析，给出了误差与采样点数的关系；根据国家关于电能质量和公用电网谐波的标准规定，对非正弦状态下的误差也做出了符合实际的估计；在电网正常情况下截断误差与采样点数的关系与理想波形时相同。

Based on the strong relationship about frames near by, the Author brought forward an particle filter algorithm importing weighted sampling about pre-frame in object tracking. The algorithm resolves the trickiness in traditional SIR algorithm which depends on statcmodcl acutely by importing proposal distribution. The algorithm can track object which movement is irregular.

根据相部帧间信息的强关联性，提出一种引入前帧加权采样的粒子滤波目标跟踪算法，解决了传统采样重要性重采样(SIR算法由于引进提议分布而需要严重依赖目标的系统状态模型的问题，可以理想跟踪运动状态不规则的目标。

In section 2, if φ satisfies some conditions, a result is obtained that f can be reconstructed from the sampling values when the sampling set is Z or the sampling set is a small perturbation of Z.

在第二节，我们证明了若φ满足适当的条件，采样节点为整数节点或采样节点为为整数节点的微小扰动时，函数能够由其采样值稳定而且唯一的重建。

We conducted a one-week intensive environmental sampling at each study facility. We monitored culturable fungi and bacteria in indoor air, near AC diffusers and outdoors, as well as temperature, relative humidity and CO2 levels.

针对五家同意参与计画之长期照护机构分别进行一个星期的环境密集采样，采样项目包括室内空气中、空调通风系统出风口、以及室外空气中的可培养性真菌和细菌，采样同时并测量温度、相对湿度和二氧化碳浓度。

The Hilbert amplitude envelope of the stator current includes the low frequency of fault characteristic, thus it can reduce the signal length by resample the Hilbert amplitude envelope of the stator current by downsampling, which can avoid spectrum aliasing. Then it can reduce the computation time of the MUSIC Method for the spectrum analysis to the resampled signals for the given bandwidth. Meanwhile combining continuous subdivision Fourier transform and rotor slot harmonics based slip estimation it can in advance estimate the concrete values of the fault characteristic frequency, and then inquiry purposely the fault feature component information in the stator current spectrum in order to accomplish the broken rotor bar fault with high sensitivity and h reliability, which eliminates adverse effect of issuable false peaks to the fault detection and formed a novel scheme to detect broken rotor bar fault.

定子电流Hilbert幅值包络信号包含了低频的故障特征频率调制信号，故通过对定子电流Hilbert幅值包络信号进行降采样率重采样、减少分析信号长度，可避免低频段频谱混叠，再对减少的重采样数据进行具有超分辨率的MUSIC低频段估计，可大大降低MUSIC算法频谱估计时间；运用连续细化傅里叶变换和转子齿槽谐波转差率估计技术，可预知故障特征频率精确值，从而可有目的地查询故障分量，消除MUSIC虚假波峰对故障检测混淆的影响，大大提高了故障检测的灵敏度和可靠性，以此形成异步电动机转子断条故障检测新方法。

RESULTS: There was significant difference in micronuclear rates of every site(P.01). PI values of 7 among 9 sampling sites were over 2.00. The micronuclear rates were higher in the sites with higher PI.

结果： 各采样点水样的蚕豆根尖细胞微核率均高于对照组(P.01)，9个采样点中有7个采样点的污染指数在2以上，污染指数高的水样组细胞微核率也高。

By utilizing the theory of numerical processing, digital frequency spectrum analysis and multi-rate digital signal processing, this paper focuses the research on mechanism of the testing error, the compensation of testing error in the field of sampling technology, nonsynchronous sampling, nonuniformly sampling, and puts forward some new analyzing, compensation and realization methods.

本论文通过运用数值处理、数字频谱分析和多抽样率信号处理的有关理论和原理，对采样技术、采样的非同步方式和采样的多通道方式中的测试原理、测试误差产生机理、测试误差补偿及其应用技术等主要环节进行了深入的研究，提出了一些新的分析与处理方法，建立了有关测试误差分析与补偿的预估理论和实现方法。

In this method a windowing parameter estimation algorithm is applied to obtain the initiative value of iteration for the nonuniformly sampled record.

对周期信号采样序列重建问题，提出了一种基于采用时域布莱克曼窗减少频谱泄漏的自适应迭代重建算法，该算法利用对采样序列加窗的方法，有效地降低采样长度为非整数倍信号周期所产生的频谱泄漏。

Compared to traditional nonuniformly sampling method, this method solves the problem of redundant data due to over-sampling in the whole sampling period, and eliminates the partial redundance caused by signal time-variant feature.

与传统的非均匀采样方法相比，该方法既解决了整个采样时段内由于过采样造成的数据冗余性，也消除了信号时变特征造成的局部冗余性。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。