查询词典 Signal-to-Noise

From the angle of a beam-forming, the cross- range focusing principle of the synthetic-aperture radar based on nonsinusoidal waves is studied. The expressions of antenna pattern for both rectangular signa l and Gaussian signal are presented. Compared with the conventional narrow bandw idth SAR whose cross-rang resolution is determined by the carrier frequency, th e cross-range resolution of the nonsinusoidal SAR is affected by the signal ban dwidth.

为研究非正弦波SAR的方位向分辨力，从波束形成的角度分析了非正弦波SAR的方位向聚焦原理，导出了基于矩形脉冲和高斯脉冲的合成孔径天线阵列方向图表达式，并与常规窄带SAR进行比较，指出影响非正弦波SAR方位向分辨力的主要因素为合成孔径长度和信号带宽，而与信号载频无关。

In the end, the spectrum expression of nonuniformly sampled LFM signal in the fractional Fourier domain is derived, and the detection probability of the signal in the case of different SNR is studied.

最后，应用该方法得到了非均匀采样LFM信号在分数阶Fourier变换域的频谱表达式，并对不同信噪比条件下信号的检测概率进行了研究。

The power module can supply the power of system. The signal opsonic module will change the voltage signal into the appropriate signals through filter into data processing module. The data processing module analyzes, calculate and deal with the data gathered. The time clock module provides the clock for multi-rate.

电源模块为系统提供电源；输入调理模块将电网中的信号转变成适当幅度的电压信号经过滤波送入数据处理模块；数据处理模块把采集上来的数据进行分析、计算和处理，时钟模块为复费率提供时钟，此外还有脉冲输出模块和通信模块。

MR images show high signal in periatrial white matter on T2-weighted images, and low signal on T1 pre- and post gadolinium.

磁共振影像显示：T2加权像上室周白质高，而在常规和钆造影后T1加权像上是低密度影。

An apparatus and method for a digital image device having an image-capturing device for photoelectrically changing an optical image focused through a lens unit, and for converting a signal output from the image-capturing device into a digital signal and processing input color data which is output in a predetermined period are disclosed.

用于具有图像捕获装置的电子图像设备的装置及方法，用于光电变换经透镜聚焦的光学图像，并将图像捕获装置输出的信号变成数字信号及处理在预定时段输出的输入色彩数据。

Among 14 cases of trigeminal tumor,12 cases were examined by CT scanning,2 cases by MRI,all of them were confirmed by pathological examination.The density appeared heterogeneous with 6 cases,homogeneous high density with 5 cases and isopyknic with 1 case.Dropped contrast medium,the 12 CT scanning pictures appeared heterogeneous potentialization,and there were no cerebral edema around the tumor.Among 2 cases examined by MRI,T1 weighted image appeared low signal,T2 weighted image appeared high signal.

内容提要三叉神经瘤14例，12例做CT检查，2例做MRI检查，14例术后均经病理检查证实。12例CT扫描呈混杂密度6例，均匀高密度5例，等密度1例，注射造影剂后多呈不均匀强化，肿瘤周围均无脑水肿。2例MRI图像T1加权像呈低信号，T2加权像呈高信号。X线平片示11例有岩骨、颅底骨吸收破坏。

During the ESR study of the effects of oxLDL on the ESR signal intensity of hydroxyl radicals in collagen (2 μg/ml)-activated platelets, we found that incubation of human platelets with collagen produced a typical four-line hydroxyl radical signal and a long-lived g = 2.005 radical detectable by spin trapper 5,5-dimethyl-1 pyrroline N-oxide.

在研究oxLDL降低由collagen 〈2 μg/ml〉刺激血小板产生的氢氧自由基〈OH●〉的ESR讯号强度的同时，我们发现以DMPO当自由基捕捉剂，collagen除了刺激血小板产生一个四线的典型氢氧自由基之外，还产生一个长半衰期 g = 2.005的自由基。

In this paper, the author propose an algorithm, called the least-squares despread respread constant modulus algorithm , combines the information of the spreading signal and the constant modulus property of the transmitted signal in the adaptation of the weight vectors.

本文介绍了利用CDMA信号的恒模特性以及用户已知的扩频码来确定2D Rake接收机的加权系数，使用这样一种综合技术构成的算法称为最小二乘解扩重扩恒模算法。

Its metering principle is that the rotation of premary instruments' roter sents out magnetic pulse signal,then the received signaI by the flow sensor monitor changes into electric signal, Through microcomputer integrating, data processing, after error sectional revision the result displayed.

该流量计的测量原理是：一次表转子旋转发出磁性脉冲信号，由流量传感探头将接收到的脉冲信号转变为电信号，经微电脑积算、数据处理、误差分段修正后显示出。

ARC1(arm repeat containing 1 ) is a very important downstream protein factor in sporophytic self- incompatible signaling process. It is made up of arm repeat domain, U-box domain, leucine zipper domain/ coiled-coil domain, one nuclear localization signal and two nuclear export signal, arm repeat domain and U-box domain are main functional domain.

臂重复蛋白ARC1(arm repeat containing1，ARC1)是孢子体型自交不亲和信号传导途径下游非常重要的蛋白质因子，由臂重复结构域、U-box结构域、亮氨酸拉链/卷曲螺旋结构域、1个核定位信号和2个核输出信号组成，其中臂重复结构域和U-box结构域起主要功能。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。