查询词典 DDS

And the discusson on quantization error and filter amplitude and phase distortion gives some new idea in this paper.

本文的主要工作及创新之处在于： 1在介绍DDS系统结构的基础上，建立并完善了DDFS和DDWS的系统误差模型。

Through analyzing the traditional implement method,the phase introduced by the quantization error of the frequency control word is put forward.

介绍了一种对基于DDS的数字本振的改进，分析了传统的数控振荡器的实现方法，指出其中由于频率控制字的量化误差带来的振荡器输出相位误差。

An example in the virtual instrument-a random signal generator, consisting of PCI card and software, is also given.

文章还给出了一个在虚拟仪器中的应用———基于PCI总线的DDS任意信号发生器的实例。

Ln the memory of dynamic data system there are 500,000 measured data. This paper deals mainly with the change of cutting area in self-excitation qualitatively and quantitatively. The changes of position of cutting edge and cutting area are indicated with graphic method. The m...

文中重点叙述了利用上述DDS对自激振动时的切削面积变化规律进行定性与定量分析研究：利用计算机对切削刃位置和切削面积变化用图示法使之"可视化"：通过统计法建立起来的切削面积数学模型，可对动态切削面积进行实时解析计算，最后通过均方差分析，对4种算法进行比较，提供了实用而准确的计算方法与结果。

A kind of signal generator based on FPGA and DDS is designed in this paper.

设计一种基于FPGA和直接数字频率合成的信号源。

On the basis of the spectrum analysis, some methods to restrain the spurs are proposed.

同时以DDS的谱分析理论为基础，给出了几种抑制杂散的方法。

The hydrolysis rate constant of TEOS in mixed systems was larger compared with TEOS in single precursor systems.

与单前驱体水解一致的是，在双前驱体系中TEOS和DDS自身的反应级数仍保持一级，但是氨和水的反应级数都有不同程度的增大。

The neodymium acetylacetone could accelerate the curing ofDDS/epoxy resin system significantly, and the toughness of the cured resin wasimproved in some conditions.

乙酰丙酮钕对DDS固化环氧树脂有显著的促进作用，在适当的固化条件下能明显提高树脂的断裂韧性。

11 Alive occupational 2-naphthylamine exposed bladder cancer patients,25 non-occupational exposed bladder cancer patients and 23 exposed controls were included for study of acetylator phenotype.

应用DDS作为实验药物，采用高效液相色谱法，研究了目前尚存话的有2－萘胺职业接触史的11名膀胱癌病人、25名普通膀胱癌病人及23名接触对照的NAT酶表型。

DDS was used as test drug for determination of acetylator phenotype employing HPLC.The results showed that both the occupational and non-occupational exposed group were predominantly slow acetylators(52.2％and 45.5％),higher than that in the exposed controls(13.0％)(0 05).The risks for bladder cancer with the slow ace...

结果表明。无论有无2－萘胺职业接触史，膀胱癌病人中慢型乙酰化者所占比例（52.2％和45.5％）均高于对照组（13.0％），且差异有显著性（P＜0.05），比值比0R分别为5.56（95％可信限＝1.02～30.3）和7.25（95％可信限＝1.70～30.3），提示慢型乙酰化者若暴露于2－萘胺更易患膀胱肿瘤，乙酰化慢表型是膀胱癌的一个遗传易感因素。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。