sampling ratio

This paper expatiates on the sampling test method of NDT on welds, discussing the sampling positions and ratio through welding procedures and welding condition analysis, which is of referential value to testers and QC personnel.

为此，对焊缝无损探伤抽查法作了较为详细的说明和分析，特别是从焊接工艺、施焊条件分析方面对抽查部位、抽查比例进行探讨，对检查人员和质量管理人员来说都具有参考价值。

Related detection must guarantee signal synchronization sampling, and get the biggest signal noise ratio.

相关检测要保证信号同步采样, 可以得到最大信噪比.

Sampling was conducted with the method of contiguous grid quadrate, Dispersion Index ( v/ m ratio) was taken as the index of aggregation intensity, and the simulation tests for Poisson and Negative binomial distribution were performed.

采用邻接格子样方法取样，运用扩散系数作为聚集强度的测度指标，并进行泊阿松分布和负二项分布的Χ2拟合检验；

Because of the capacitance bottom plate sampling and fully differential structure, the charge injection effect of switched-MOSFET and the clock feed-through effect induced signal error are eliminated. The linearity, signal to noise ratio ( SNR) and conversion-speed of the ADC are improved.

由于采用了电容下极板采样和全差分结构，能够有效地消除开关管的电荷注入效应和时钟馈通效应引起的采样信号的误差，提高模数转换器的线型度、信噪比和转换速度。

Methods An equal-sized stratified multi-stage randomly sampling design was applied to obtain three provincially representative sample groups consisted of 720 Guangdong residents each, aged at 12,35-44 and 65-74 years old respectively, with a gender ratio of half to half.

方法采用多阶段分层等容量随机抽样的方法，抽取广东省12岁、35~44岁、65~74岁城乡常住人口各720人，男女各半。