查询词典 high-frequency

The results showed that the frequency of germination were able to be increased by keeping seed vessel, culturing seeds with radicle up and pre-treating seeds in 5.0mg/L GA3 solution for 12h. The frequency of explant-browning was reduced by adding AC 0.5mg/L to induction media and the vigor of plantlets was promoted by the AC-adding. The propagating coefficient could be improved and the frequency of bud-vitrifration increased by adding 150mg/L coconut water.

结果表明发芽时保留种皮、接种时胚根向上对蚕豆种子的萌发有着至关重要的影响，用5.0mg/L GA3溶液浸种12h有利于种子萌发；培养基中添加0.5g/L AC能有效抑制外植体的褐化，并能使植株生长健壮；培养基中添加150mg/L椰汁能提高繁殖系数，有效抑制玻璃苗的发生。

In terms of the documentation frequency of these historical data on earthquakes of 4.7 magnitude or above in the past 3000 years ( Table 5 ) the frequency was below 2 times per 10 years for most of the time before the Song Dynasty; when printing was invented in the Song Dynasty the frequency increased to 3 times per 10 years; after the invention of seismoscope in 1900 it reached 100-1000 times per 10 years.

从3000年来4.7级以上的(ji2 yi3 shang4 de0)历史地震的史料记录频度看（图5），宋朝以前的绝大部分时间都在（2次/10年）以下；宋朝出现了印刷术，记录频度增到（3次/ 10年）以上；1900年后现代地震仪问世，记录频度达到（100-1000次/10年）的高水平。

Radar frequency voice hoist features choice: allow users to choose a simple warning or select the frequency on the sound frequency Gun alerts using both voice and sonorant.

雷达频率语音启闭功能选择：让用户可选择单纯频论响声警示或选择频謴语音及响音警示同时使用。

The formula for lower limit of natural frequency of tapered pier of continuous beam bridge were derived by the combination of Rayleigh and Southwell method. The natural frequency of tapered pier was composed of the sum of frequency of each subsystem consisted in inertia component and deformable component.

采用瑞利法和Southwell频率合成法，将基频表示成各惯性元与复位元所组成的子系统的频率合成，导出了变截面桥墩自振频率下限的计算公式。

In the aspect of the study of the application of HHT method, This dissertation has done three part of jobs: first, the Elcentro strong ground motion which is in common use in earhtquake engineering is analyzed by HHT method, getting its amplitude-frequency-time distribution and the comparison between the HHT marginal spectrum and Fourier spectrum is also made; second, the typical nonlinear system defined by the Duffing equation is analyzed by HHT method, getting its numerical value's amplitude-frequency-time distribution and the comparison between the HHT marginal spectrum and Fourier spectrum is also made; third, define the stationary degree of non-stationary signals making use of 3-D time-frequency spectrum and marginal spectrum, the stationary degree curve of Elcentro seismic recording is protracted according to its defining formula, the stationary degree curve of Elcentro seismic recording which change with time is protracted according to similiar definition.

在HHT方法的应用研究方面，本文做了三部分的工作：首先，利用HHT方法分析了地震工程中常用的Elcentro非平稳强震记录，得到了该记录的振幅－频率－时间分布特性，并将得到的边际谱与傅立叶谱做了比较；其次，应用HHT方法分析了典型的非线性系统－Duffing方程，得到了该方程数值解的振幅－频率－时间分布特性，并将得到的边际谱与傅立叶谱做了比较；最后，利用三维时频谱与边际谱定义了非平稳信号的平稳度，并依照其定义式绘制了Elcentro地震波记录的平稳度曲线，依照类似与依赖与频率变化的平稳度定义，初步尝试编程绘制了Elcentro地震波随时间变化的平稳度曲线。

In the mobile communication system, the intermediate frequency signal results in the characteristic value is took the appraisal signal quality one kind of standard, how this topic main research is withdraws the intermediate frequency signal the characteristic value,as well as withdraws in the method in each kind to select superiorly withdraws the intermediate frequency signal characteristic value the method.

在移动通信系统中，中频信号得特征值是作为评估信号质量的一种标准，本课题主要研究的是如何来提取中频信号的特征值，以及在各种提取方法中选出最优的提取中频信号特征值的方法。

Plasma is a dispersive medium and its equivalent refractive index is related to the frequency of the incident electromagnatic wave and the plasma frequency, so it is feasible to shift the syntonic frequency of plasma defect by changing the plasma parameters, which behaves as a tunable filter.

据等离子体的强色散特性，其等效折射率与电磁波频率及等离子体频率等参数有关，因而可以通过改变等离子参数，使一维微波光子晶体缺陷层的谐振频率发生偏移，实现微波光子晶体的可调谐滤波特性。

The crystal oscillator provides frequency stable accurate 32768Hz the signal. After frequency divider frequency division to 1Hz stable accurate function signal,Does for the counter pulse signal. Six counter serial connections,Uses the decimal base and the senary counting separately (when ten for ternary notation counting). Comes out through 7448 decoders and the monitor appearances,The counting cycle is 24 hours.

晶振提供一个频率稳定准确的32768Hz的信号，经过分频器分频的到1Hz稳定准确的函数信号，做为计数器的脉冲信号，六个计数器串行连接，分别采用十进制和六进制计数，通过7448译码器和显示器显现出来，计数周期为24小时。

The principle of MUSIC algorithm and theoretical analysis of the spectral separate frequency and frequency detection threshold are included. MUSIC algorithm compared with FFT based algorithm for harmonic frequency estimation using matlab simulation platform .

给出了MUSIC算法的基本原理，对MUSIC算法的频谱分辨能力和频率检测门限进行了理论分析，在Matlab仿真平台下对MUSIC算法和FFT算法的频率估计性能进行了比较。

This measurement frequency using direct comparison of the phase relation is a new important method to probe into the accurate measurement of the ultrahigh frequency like the optical frequency.

这种利用相位关系直接比对测频是探索光频等超高频率准确测量的一种重要的新方法。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。