There are some pulse competition in the digital natural sampling based SPWM.
SPWM数字化自然采样法存在脉冲竞争现象。
When sampling frequency is quite high, frequency spectrum distributing of digital natural sampling and natural sampling is similarity.
当采样频率比较高时，数字化自然采样法的频谱分布与自然采样法的频谱分布类似。
As the natural sampling method generating SPWM pulses closer to sine wave is impractical in real-time control, the regular sampling method with poor precision is usually adopted in practical projects.
自然采样法产生的SPWM脉冲效果最接近正弦波，但工程中不利于实时控制，在实际中常采用的规则采样法精度不够高。
Methods in 1999, a cross-sectional study was carried out in a natural population of Beijing, using stratified-random sampling method.
方法1999年在北京市自然人群中采用分层随机抽样的方法进行横断面调查。
Forty students, selected from two natural classes by pair-sampling, were assigned to four groups, ten subjects for each group.
共有四十学生参加，他们是配对抽样从两自然班选出并被分成四组，每组十人。
"It's kind of obvious in retrospect," Xu said, "but sticky spider webs may be a 'natural' DNA sampling device for DNA from the spider, and from what it's been eating."
徐说，“现在回想起来好像也很显而易见，粘粘的蜘蛛网是收集蜘蛛及其食物dna的“自然”采样设备。”
PFU can be used as a sampling method for detection of organic chloride pollutants in natural water body and concentration variety of organic chloride pollutants in continuous water body.
有机氯污染物检测结果与PFU微型生物参数变化趋势相吻合。PFU法可用于天然水体中有机氯污染物的筛选，以及连续水体中有机氯污染物浓度变化的监测。
Methods: Sampling was carried out in natural about water source of the Yellow River and running water in HuiNong area.
方法：对惠农地区黄河水和自来水进行采样分析。
Methods: Sampling was carried out in natural about water source of the Yellow River and running water in HuiNong area.
方法：对惠农地区黄河水和自来水进行采样分析。
应用推荐