查询词典 frequency band

This assay is focuses on part of access network technology. The main contents are as the follows.To discuss the function of the forthcoming copper loop, city cable channels once and twice parameters are analyzed and calculated, and simple analytic model are used to describe the characteristics of channel. The transformation of parameter related to applied HDSL technology in higher band of frequency, and the influences of near reaction and twisted subscriber line are mainly analyzed.

本文针对接入网技术的部分技术进行了分析和讨论，主要内容有以下几部分：为探讨现有的铜线回路的性能，对市话电缆信道的一次参数和二次参数进行了分析计算，并引入简单的解析模型来描述信道特性，其中着重分析了与应用HDSL技术有关的较高频段内参数的变化，邻近效应和用户线扭绞等因素的影响。

Currently, the broadcast satellite payloads consist of three Ultra High Frequency Follow-On satellites and three commercial Ku Band satellites.

目前，广播卫星载荷由三颗超高频后继卫星和三颗 Ku 波段商用卫星组成。

The principle of partial discharge detection of gas insulation switchgear with ultra high frequency is discussed.A 220 kV GIS bus bar cavity is adopted as a test object to design and simulate four typical defect models in GIS.The PD signals produced by the four models are obtained via the PD detection system,which is developed by the authors on the basis of the narrow band UHF method.

为了提高GIS运行的可靠性，笔者简要说明了超高频法检测GIS局部放电的原理，并在实验室以一段220 kV电压等级的GIS母线为试验对象，设计和模拟了GIS中典型的4种局部放电模型，并使用自主研发的超高频窄带检测系统对其局部放电信号进行检测。

RESULTS The SOD activity had linear correlation with pH in the range of pH 2.2-8.0 when SOD concentration was fixed. The varication of activity after ultrosonication had linear correlcation with fluoresent intensity at 340 nm. With increase of uhtrosonic frequency, the microenviroment of tyrosine and tryptophan inside the SOD molecule was changed, then the balance of hydrophokicity and hydrophilicity inside the molecule was broken, this induced the blue shift of synchronous spectrum band and decrease of SOD activity.

结果 SOD浓度一定、pH2.2~8.0时，活性与其线性相关，超声后活性差值与340 nm荧光强度差值的线性相关；随着超声次数的增加，蛋白质SOD分子内部的酪氨酸、色氨酸所处的微环境被扰动，打破了分子内部的疏水和亲水平衡，使蛋白质的活性降低，在荧光检测中观察到普通荧光谱带蓝移，同步荧光的荧光峰位总体呈现峰位蓝移和强度下降。

That is to say, by using the special digital converter or running relevant arithmetic, it converts the radio signal to intermediate frequency signal and completes the base-band signal process that isn"t the veriest SR and is named "software defined radio. This paper introduces the rapid system prototype into the design of software radio system, which has great advantage because rapid system prototype technology can be used to describe the future application.

由于受到硬件性能如A／D、D／A及DSP芯片处理速度的限制，目前的软件无线电系统多采用折中的实现方案，增加专用的数字变频器或者运行数字变频算法，将射频信号变频到中频，然后再进行基带信号处理，这样的软件无线电系统又被称之为"软件定义无线电"，它并不是真正意义上的软件无线电。

The hardware electric circuit includes: Heart electrical signal gathering, enlarges the electric circuit, the band-pass circuit, the host enlargement electric circuit, the 50Hz wave trap and the electricity frequency lifting electric circuit.

硬件电路包括：心电信号的采集、放大电路、带通滤波电路、主放大电路、50Hz陷波器和电频抬升电路。

The working frequency depends on the substance used and lies in the band of 10 MHz to several GHz.

它工作的频率依靠所用的物质在 10 兆赫到几千兆赫之间。

The semaphore source of electrocardiogram is in the performance of high resistance, small breadth and low frequency, due to which the heart electricity should be dealt with amplificatory circuit、low-pass filter and band-elimination filter which are correlated to.

心电信号具有阻抗高、幅度小和频率低等特点，针对这些特点，采集的心电信号通过放大电路、低通滤波器和带阻滤波器等相关处理。

This will increase the frequency of the inverter. The output of the hysteresis band is changed to be anisomerous and some available results are given by emulating.

本文在分析这种波动产生原因的基础上，提出对滞环比较器进行不对称上下限的设置以抑制转矩较大的波动和降低逆变器的开关频率。

In the development of filter, adopting interdigital structure of stripline ,it is providewith higher rejection and has no autoeciousness band in very wide frequency.structureof debugging is added to reduce the affection of manufacture error improving the indexsignificantly.

滤波器设计中，采用带状线交指结构，带外抑制度高，并且在很宽的带内没有寄生通带；根据滤波器自身的结构特点加入了调试装置，用来补偿加工带来的误差，极大的改善了测试指标。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。