抽样

At first, some properties in the sampling subspace are classified. Then, that the subspace spanned by the translation of a function is also a subspace is proved in the shift invariant subspace.

首先通过Zak变换刻画了抽样空间的一些性质，然后证明了在一个平移不变的抽样空间中，由其中任一个函数的整平移所张成的子空间也是抽样空间。

The main research and application result is: five dynamic sampling frames with spatial autocorrelation analysis are achieved such as high-high, low-low, high-low, low-high and not significant, and finally the result of per capita agricultural total output value of Beijing with spatial stratified sampling technique is 35.80 thousand Yuan RMB, with the sampling error range is ±3.861 thousand Yuan RMB.

其结果为：动态生成"高－高集聚"、"低－低集聚"、"高－低集聚"、"低－高集聚"和"分布不明显"5个抽样框，并最终通过空间分层抽样流程得到北京市人均农业总产值的抽样调查结果为3.580万元，抽样误差的允许范围为±0.3861万元。

In order to determine the convergence of the line samplingbased reliability sensitivity method,the variance and the variation coefficient were derived for the reliability sensitivity estimation based on the line sampling.

为判别线抽样可靠性灵敏度分析的收敛性，推导了线抽样可靠性灵敏度估计量的方差和变异系数的计算公式，近似计算了线抽样可靠性灵敏度在给定置信度下的置信区间。

In order to determine the convergence of the line sampling -based reliability sensitivity method,the variance and the variation coefficient were derived for the reliability sensitivity estimation based on the line sampling .

为判别线抽样可靠性灵敏度分析的收敛性，推导了线抽样可靠性灵敏度估计量的方差和变异系数的计算公式，近似计算了线抽样可靠性灵敏度在给定置信度下的置信区间。

Unequal probability sampling is a very effective method for sampling applications,which is a sampling scheme with unequal probability .

不等概率抽样是赋予总体每个单元不完全相等入样概率的抽样，是实际中十分有效的抽样方法之一。

We can get around this problem unknown sampling error to a large extent if we use probability sampling, since we can get estimates of the sampling error from the sample itself.

偶们可以处理这个难题未知的抽样误差在非常大程度上假如我们用概率抽样，因为我们可以从样品本身的抽样误差估计。

Genetic algorithm optimization process can be seen as algorithms in the process of constant cycle of viable domain random, using the results of previous sampling probability distribution on the target point estimates, and then based on an estimate of the projected distribution of a sample point.

遗传算法优化的过程，可以看作算法在循环过程中不断对可行域进行随机抽样，利用前面抽样的结果对目标点的概率分布进行估计，然后根据估计出的分布推算下一次的抽样点。

According to the principle of proportional allocation,a three-stage sampling survey was set up.

应用按比例抽样原理，建立三级抽样框，抽样比为15％的问卷抽样调查。

As the results of this sampiing area were far below those derived from calculation of the critical sampling area, the paper concluded that the setting size and direction of a basic sampling quadrat could have a great influence on the efficiency of each sampling.

研究发现沿垂直于沙丘走向的方向布样，以4m 4m为基本样方，抽样272m^2即达到60％群落物种，远低于临界抽样面积的求解结果，表明基本样方大小和设置方向对抽样效率产生重要影响。

Based on the mutual fund market share of companies in the investment trust industry, quota sampling method was adopted to determine the sample size. The questionnaire survey was conducted with the convenience sampling method, using electronic questionnaires to collect primary data. A total of 423 questionnaires were distributed and 400 effective questionnaires were collected, comprising the effective return rate of 94.56%.

根据投信公司的基金规模市场占有率，采用配额抽样法分配抽样之样本数，每一投信公司依分配之样本数以便利抽样法选取受访者，以电子问卷作为搜集初级资料的工具，共计发出问卷423份，回收有效问卷400份，有效回收率为94.56%。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。