查询词典 frequency band

This main goal of this research is to design and implement a bioimpedance measurement system with multi-frequency band using LabVIEW for acupuncture point verification, provides the electrical impedance measurement and analysis data of acupuncture point, extrapolates various internal organs the activity and its disease in.

本研究主要的目的是设计一套以LabVIEW为控制介面之针灸点验证用多频生物阻抗量测仪，提供穴位电阻抗量测与分析数据，来推测各脏腑的活动和其疾病的所在。

At last, we recomposed some frequency band of wavelets, and the results can efficiently extract the features of acoustic emission signal.

最后通过对能反映源特征的频带信号进行重构，这样能更好更有效的提取声发射信号的本质特征。

D the Amateur Frequency Band.

业余无线电频道分配。

Following, a experiment has been carried out, the incident waves with a frequency band of 200kHz-3 50kHz are used to the experiment, and a series of peak value-time curves are drawn each 10kHz, corresponding time are found through fitting peak value, thus the position of the defect is calculated accurately. The application of awl-shaped sensor head in the heat change water pipe experiment indicates that the ultrasonic guided waves may transmit nearly 50 meters in the pipe, which is not influenced by the elbows and makes it possible to test defects in long distance and large-scale. The water-load pipe experiment indicates that the displace and energy maybe leakage at the near-surface, which is significant for the further research.

而后，采用200kHz至350kHz频段的入射波进行了实验验证，并每隔10kHz绘出一条峰值一时间的曲线，通过拟合峰值点，找到对应的时间，从而准确的计算出了缺陷的所在；应用锥形探头的热交换水管的实验表明，超声导波可以在管道中传播了近50米的距离，且不受弯头的影响，从而使得长范围、大规模检测成为可能，水载管实验说明了离面位移和能量可能会发生泄漏的特性，为导波的深入研究和应用作了铺垫。

The system consists of radio frequency band pass filter, local oscillator and sub-harmonic mixer.

文中对构成电路的鳍线及其不连续性和构成系统的三个部分分别做了研究。

Finding out the major concentrated frequency band of tool-wear information can enhance SNR and improve tool-wear degree recognition result.

找出刀具磨损信息在可听阈内的主要集中频段能提高切削声信号的信噪比，改善识别结果。

Recent progress in radio prototype has extended the horizons of radio technology by liberating chronics dependence on hard-wired characteristics including frequency band, channel bandwidth, and channel coding. These efforts have led us to the feasibility of dynamically programmable receivers system of software radio.

软件无线电系统的硬件结构与功能相对独立，这样就可以基于相对通用的硬件平台，通过软件实现不同的通信功能，并可对工作频率、系统频带、调制方式等进行编程控制，系统的灵活性大大增加。

Two kinds of methods, that is, 128-channel high temporal resolution electroencephalograms and coherence technology, were integrated to research the cognitive activation patterns in responding to the task of form perception （task1）and the task involving both form discrimination and spatial location(task2). Simultaneously, the scalp was divided into 7 parts from occipital area to frontal area, each of them included same number electrodes. Coherences, between occipital area and other areas, of different frequency band were calculated.

利用128道高分辨率脑电测量技术及脑电相干处理技术，通过测量大脑对图形形状知觉（任务1）、图形形状和空间位置知觉（任务2）两种任务的事件相关电位，并基于电极数大致相同的原则，从枕叶至额叶把头表分成了7个区，然后分析了枕叶与其它各区在不同频段的相干性。

BCBBs are designed for not only symmetric linear arrays but also asymmetric linear arrays, are arrays and circle arrays. The BCBBs designed are tested by LFM signals, and the results show that the BCBBs achieve good quality. The word length of the filter efficients are studied from the view of engineering implementation. It is shown that using 8 bits can satisfy the requirement. Multi-beam BCBBs with 2 degree beamwidth in two octave and 1/3 octave frequency band are designed and tested for a specified array.

设计好的宽带恒定束宽波束形成器用线性调频信号进行了检验，证明了其正确性；从工程实际的角度出发，研究了滤波器系数字长对系统性能的影响，研究表明采用8位的滤波器可以满足要求；结合实际课题，在深入分析阵形结构特征的基础上，分别设计了倍频程和1/3倍频程多波束宽带恒定束宽波束形成器，并通过线性调频信号进行了验证，为其工程实现打下了良好的基础。

"On the other hand , it is imperative to develop high frequency band relay communication system in those poor raining regions."

另一方面，在那些少雨地区急需开发高频段的微波接力通信系统。

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。