采样

In ocean wave simulation,a view-dependent ocean wave mesh model is given by experiment analysis for two common mesh models,which are based on random sample points and based on fixed sample points.

在海浪模拟中，通过对两种常用网格化模型(基于随机采样点的网格化和基于固定采样点的网格化)的实验分析，给出了一种视点相关的海浪网格模型。

Two daycare centers were selected for intervention study by spraying the WAHW in the classrooms without the presence of children. A week-long biological sampling of the background, including bacteria and fungi, was conducted before the remedial action took place. The WAHW was sprayed in the following week after children left the schools and before they returned the next day using a fogger.

在介入前先进行一周的生物性采样，包含细菌及真菌；接著於儿童放学后，利用雾化器於晚间至隔天早上上课前，将次氯酸水雾化后喷洒於空气中，持续喷洒一周，并同时采集生物性样本；最后停止喷洒次氯酸水后，再进行一周的生物性采样，次氯酸水的喷洒实验分别於夏季与冬季各进行一次。

When up to 31th harmonics are analyzed, the calculation time is only 1/82 of theat by the classical Gaussian elimination method.

对于一个周期值事先不知道，在一个周期内有100个采样点的非整周期采样，这个近似方法可使谐波分析的准确度由一般的DFT的10〓量级提高到10〓量级；当分析至31次谐波时，计算时间约为经典高斯消去法的〓，将能满足实际的工程需要。

The optimal density of sampling points can be determined by the sampling grid cell size and the field area.

合理的采样密度可以根据允许的采样误差及要求的属性地图输出栅格单元尺寸而定。

We choose the TMS320VC5402, digital signal processor, as the computing unit, filtering the sampled signal, truncating the harmonic whose frequence greater than 2500hz, then we use the window-interpolation FFT algorithm to get the refined frequence, amplitude, phase of harmonic in sampled voltage and current, other parameter such as harmonic ratio, active power, reactive power, power factor, three-phase unbalance can be also computed base one the result of window-interpolation FFT.

选用TMS320VC5402高速数字信号处理器作为运算单元，先对采样信号进行数字滤波，去除50次以上谐波分量，然后应用加窗双峰插值FFT算法计算电压电流的各次谐波频率、幅值和相位，以及谐波含有率、有功功率、无功功率、三相不平衡度等各项电能指标，同时利用锁相环电路硬件跟踪电网频率以减小采样失步度。

The X-ray technology there allowed scientists to examine metal samples that were, in Dr Hodson's words,"around 1,000 times smaller than a grain of salt".

那里的 X 射线技术使科学家们能够检测金属采样，拿霍德森博士的话说就是：能够检测比一粒盐还要小1000倍的金属采样。

Based on the data of hydrography, measured waves, sediments, drilling Quanternary strata, microorganism, sporopllenin, landforms, climate and others in Zhoushan Islands channels, the strait channel effects are systematically studied.

本文根据舟山群岛峡道内分布于虾峙门、马岙、金塘水道和册子水道的水文泥沙实测资料，北仑港、野鸭山和虾峙门口门区的波浪观测资料，北仑电厂运煤码头前沿的第四纪地层钻孔资料、微体古生物鉴定和孢粉分析资料和虾峙门口门区5米浅钻资料，分布于金塘水道、册子水道、马岙三江口海域、虾峙门口门区和杭州湾南部的海底沉积物采样分析资料，册子水道东部野鸭山潮滩和马岙三江口潮滩的沉积物采样分析资料、潮滩地貌的踏勘资料、舟山群岛峡道地区的海图资料以及舟山群岛地区气象气候等其它资料，对舟山群岛峡道效应进行了综合性的系统研究。

The samples according to Nyquist sample rate in one period of OFDM symbol are independent identically distributed random variables.

在过采样条件下，分析了正交频分复用系统在不同采样率时，信号峰值平均功率比的统计特性。

10 Multifunction Intelligent DAQ using LabVIEW FPGA, 8 analog inputs, independent sampling rates up to 200 kHz, 16-bit resolution,±10 V,8 analog outputs, independent update rates up to 1.0 MHz, 16-bit resolution,±10 V,96 digital lines configurable as inputs, outputs, counters, or custom logic atrates up to 40 MHz,User-defined triggering, timing, and onboard decision making with 25 ns resolution,1M gate reconfigurable I/O FPGA for parallel processing power

2.10 使用LabVIEW FPGA模块的可重新配置多功能I/O，8路模拟输入、200 kHz同步采样率、16位分辨率、±10 V，8路模拟输出、1 kHz同步采样率、16位分辨率、±10 V，96条可配置的数字线，具有40 MHz输入、输出、计时器或自定义功能，25 ns分辨率的可配置触发、定时、板载决策，1百万门可重新配置I/OFPGA，带有82 kB嵌入式RAM

The principle of testing the dynamic performance infrequency domain of rotary table control system by computeris described and the causes of spectrum leakage by dispersion Fourier transform are introduced.

简要介绍了用计算机实现数字化测试转台控制系统频率特性的原理和离散傅里叶变换频谱泄漏产生的原因，然后针对正弦稳态测试，采用了一种调整采样周期和匹配采样长度的复合数据处理算法。

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。