查询词典 Signal-to-Noise

Baseband signal can control by serial each that one-chip computer produce phase place , DDS of generator control and bring in realizing, and the phase locking ring of the integration can produce the signal carrier within AD9856 chip, its frequency is set up through the interface of the outside one-chip computer.

基带信号可以由单片机产生的串行码元控制DDS发生器的相位控制端来实现，而AD9856芯片内部集成的锁相环可以产生载波，其频率也是通过外部单片机的接口来设置。

Baseband signal can control by serialeach that one-chip computer produce phase place , DDS of generatorcontrol and bring in realizing, and the phase locking ring of theintegration can produce the signal carrier within AD9856 chip, itsfrequency is set up through the interface of the outside one-chipcomputer.

基带信号可以由单片机产生的串行码元控制DDS发生器的相位控制端来实现，而AD9856芯片内部集成的锁相环可以产生载波，其频率也是通过外部单片机的接口来设置。

Pseudo-random multi-frequency signal is invented and named by academician He Jishan. The bandwidth of PRMF signal is controllable, it's energy concentrates on several frequencies, which are equally spaced on log scale coordinates.

何继善院士发明和命名的伪随机多频信号，由于其带宽可控，能量主要集中在数个在对数坐标上呈等间距分布的频率上，是电法勘探的理想场源。

Pseudo-random multi-frequency signal is invented and named by academician He Jishan. The bandwidth of PRMF signal is controllable, it's energy concentrates on several frequencies, which are equally spaced on log scale coordinates. It is ideal excitation source for electrical exploration.

中文题名伪随机多频电磁法观测系统研究副题名外文题名 The study on pseudo-random multi-frequency electromagnetic prospecting system 论文作者陈儒军导师何继善学科专业地球探测与信息技术研究领域\研究方向学位级别博士学位授予单位中南大学学位授予日期2003 论文页码总数165页关键词电法勘探电磁法伪随机多频信号馆藏号BSLW /2003 /P631.3 /4 伪随机多频信号由何继善院士发明和命名，该信号带宽可控，其能量集中在数个在对数坐标上呈等间距分布的频率上，是电法勘探的理想场源。

For transgenic mice,98%~100% of metaphases and 85%~94% of interphases showed hybridization signal.For negative control mice,100% of metaphases and 95%~96% of interphases showed no hybridization signal.

阳性转基因小鼠98%~100%的中期分裂相，85%~94%的间期核出现杂交信号；阴性对照小鼠100%的中期分裂相、95%~96%的间期核未出现杂交信号。

Gigabytes. The motion picture on the videodisk is encoded as frequency modulation, and the audio signal is mixed with the video signal.

视频盘上的视频信号以调频方式编码，音频信号混入视频信号中。

Secondly, the operating principle and the mathematical model and the control method about the three-level voltage source high power factor PWM converter are analysed .The generation of the PWM trigging pulse control signal are introduced emphatically. On the basis of this, the hardware experimentation circuits are built with DSP and CPLD, and the trigging pulse signal is generated exactly. The feasibility of the circuit is verified by the experiment result.

其次，分析了三相电压型变流器的原理、模型、控制方法并着重研究其PWM 触发脉冲控制信号发生技术，并以DSP、CPLD 等芯片搭接了硬件试验电路，产生了正确地触发脉冲信号，试验结果证明了设计的合理性。

Broad signal source, compatible PAL system and NTIS make a video signal, but videoplayer , telecamera , TV video frequency export direct butt-joint with VCD , DVD , magnetic tape.

宽泛的信号来源，兼容PAL制和NTIS制视频信号，可与VCD，DVD，磁带放像机，摄像机，电视视频输出直接对接。

A subtractor (16) subtracts the crosstalk signal from a read signal.

减法器(16)从读取信号中减去所述串扰信号。

Results In healthy subjects, L2-L5 nerves were displayed clearly by MRN, with a round or ellipse ganglion of 3-6 mm in diameter, and smooth stick-like nerve root and trunk, 2-5 mm in diameter. The signal intensity was higher in ganglion than nerve root or trunk. 40% of nerve root sheath was surrounded by small amount of cerebrospinal fluid, Femoral nerve was displayed in all subjects, while only 83.3% of obturator nerve and 43.3% of lumbosacral trunk were manifested. Lamellar blurred hyper-signal intensity was seen around 80.9% of lumbar plexus in GBS, but none in CIDP.

结果 正常组MRN可清晰显示腰2~5神经的走行，神经节呈圆或椭圆形膨大，大小约为3~6mm，神经根及干呈条状、边缘光滑，大小约为2~5mm、神经节信号高于神经根和干，40%的神经根鞘有少量脑脊液，股神经、闭孔神经、腰骶干的显示率分别为100%、83.3%、43.3%。80.9%的GBS腰丛神经周围有片状模糊高信号，神经根和节大小和信号无明显改变，25%神经干增粗，50%的神经干信号增高，边缘模糊。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。