查询词典 frequency

Using triple integral equation based on scalar Green function for forward modeling transient electromagnetic response to a 3 D anomalous body, a frequency response of electromagnetic field component has been evaluated first on frequency domain, then the evaluated results has been transformed into time domain by using fast numeric filtering algorithm.

用基于张量格林函数的体积分方程对三维异常体进行瞬变电磁响应的正演模拟，首先在频率域内计算电磁场分量的频率域响应；然后利用快速数字滤波技术将计算结果转换到时间域。

In order to detect load in tumbling box correctly,the frequency band that could reflect information of mill ball load was obtained from the vibration signal collected from ball mill bearing block.The signal was analyzed by energy method based on wavelet transform,from which the frequency band signal was picked out to show the corresponding coal level in tumbling box.

为了更准确地检测料位，对球磨机轴承座振动加速度信号进行采集，从振动信号中提取了反映料位信息的特征频段，利用小波分析技术对信号进行了能量分析，分离出反映滚筒内存煤量信息的信号，为实现球磨机料位的自动控制提供了理论依据。

Semiconductor laser with characteristics of narrow line width、tunableness andstable frequency is the necessary source of WDM、DWDM and coherent lightcommunication, it is also widely used in high frequency laser spectrum、detectionand measurement、fiber sensor etc.

窄线宽、可调谐、频率稳定的外腔半导体激光器是波分复用系统、相干光通信技术必须的光源，在高分辨率激光光谱、检测计量和光纤传感等领域均有重要的意义及广泛的应用前景。

Starting with low frequency IC tags, Cantechs also pays attention to research and application of Ultra High frequency IC tags.

以低频电子标签起步的凯泰国翔目前也在关注超高频电子标签的研发和应用。

To suppress the noises in PD monitoring of XLPE cable accessories on site, the combined denoising method based on the fusion of ultra high frequency and low frequency measurements was put forward.

本文针对电缆局部放电现场检测中存在的各种干扰，提出了将超高频法和低频法相结合的联合检测方法。

This paper presents a low voltage, low power RF/analog front-end circuit for passive ultra high frequency radio frequency identification tags.

提出了一种适用于无源超高频射频识别标签的低电压低功耗射频／模拟前端电路。

High frequency and ultra high frequency measurements are adoptedin on-line partial discharge monitoring for power transformer.

变压器局部放电在线监测通常采用高频检测法和特高频检测法。

In VHF/UHF(Very High Frequency/Ultra High Frequency),the standard microstrip antennas of half-wave length are still very big .

在较低频段，传统的半波长微带天线尺寸仍然太大。

Very High Frequency/ Ultra High Frequency communication is good at mobility and flexibility, and it also appears with features of moderate transmitting power, reasonable equipment cost, very sound anti-destroying ability and great security.

短波/超短波通信不仅具有很好的机动性和灵活性，而且其发射功率小，设备简单，抗毁性强。

Around the frequency band setting and standardization problem for RFID, argument has been continuing, and government can't make conclusion, Until April 20th 2007, Information Industry Ministry can't voice the trial band In ultra high frequency.

摘 要：围绕着对RFID的UHF频段的开放和标准的制定问题，国内争执不休，政府主管部门长期久议不决，直到2007年4月20日，信息产业部才发布了频段评断试用的通知书。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。