查询词典 clock frequency

Taking the development platform of HVDC power transmission for example, the calculation result of impedance-frequency characteristic of traditional line commutated converter and that of FCC are compared. Simulation results show that the impact of impedance-frequency characteristic of converter on the resonance frequency of AC system is not negligible, and FCC can enhance the strength of AC system in a certain extent, improve system stability and effectively reduce AC equivalent impedance under resonance frequency, thus the harmonic instability of HVDC power transmission system can be avoided.

以直流输电开发平台为例，对传统电网换相换流器(line commutated converter，LCC)与FCC的阻抗频率特性计算结果进行对比，仿真结果表明换流器的阻抗频率特性对交流系统的谐振频率有着不可忽略的作用，FCC在一定程度上提高了交流系统强度，改善了系统稳定性，有效降低了系统谐振频率下的交流等值阻抗，从而更好避免直流输电系统谐波不稳定现象的发生。

According to the method, model dimension is contracted to five by the way of selecting the unit in which amount of I/K is m inimal. Then sensitivity of frequency to stiffness is calculated. After the diff erence between measured frequency and calculated frequency have been got, the ad justed amount of stiffness is calculated by the using of the sensitivity and the frequency difference.

该方法按照I/K最小优先合并原则，将轴系模型自由度数缩聚为5，分析该模型4个刚度对前4阶频率的敏感度，算出实测的前4阶频率和模型计算频率之间的差值，利用敏感度和频率差值计算出刚度的调整量。

In shoaling process, the main peak frequency of broken wave spectra moves to lower frequency. With decreasing relative water depth, both the ratios of wave spectral energy at twice and triple peak frequency to main peak frequency increase. and when the value of the nonlinear parameter increases, both the ratios increase, too. The Stokes third order wave theory has the same tend but overestimates the value quantitatively.

波浪浅化时，碎波后主频频率有往低频移动之现象，且波浪进入浅水区，相对水深减小，非线性参数Ursell number越大时，二倍主频及三倍主频与一倍主频能量比值均有增加之现象，与 Stokes三阶理论有相同之趋势，但实验之比值在定量上小於Stokes三阶理论值。

Namely in high-frequency unit use gradually incisive time resolution and lower frequency resolution, in order to moves the near observation signal quickly to change the part; In low frequency partially has the higher frequency resolution and the lower time resolution, in order to moves the far observation signal slowly to change partially, the wavelet this kind of signal analysing expression characteristic to analyzes the non- steady signal is extremely effective, suits the transient state anomaly very much which smuggles in the survey normal signal and demonstrates its ingredient, therefore by reputation for analysis signal microscope.

即在高频部分使用逐渐尖锐的时间分辨率和较低的频率分辨率，以便移近观察信号的快变部分；在低频部分具有较高的频率分辨率和较低的时间分辨率，以便移远观察信号的慢变部分，小波这种信号分析表示特征对分析非平稳信号是非常有效的，很适合于探测正常信号中夹带的瞬态反常现象并且展示其成分，所以被誉为分析信号的显微镜。

With the development of semiconductor devices, the switching frequency of PWM converters becomes higher, which makes PWM converters (mainly high-frequency transformers, inductors and capacitors in converters) smaller, and this will benefit design and application of them. Whats more, higher switching frequency will reduce the audio-frequency noise and improve dynamic response of PWM converters.

随着半导体器件技术的不断发展，PWM变换器所能达到的开关工作频率越来越高，使得变换器(主要是变换器中的高频变压器、电感等磁性元件和电容)的体积和重量越来越小，这有利于PWM变换器的设计及推广应用。

RIT control. The receiver incremental Tuning control is used to fine tune to the received singal . This is used in USB and LSB modes to obtain maximum clarity of reception, and in CW mode to control the pitch of the beat note. The RIT Control can tune the receive frequency about 2.3 KHz. This control will not transmit frequency, or the frequency display, but will change the receive frequency.

RIT control ：收信机微调旋钮是用微调调整使你能收到被认为是标准的信号，在USB和LSB模式使用可以获得最清晰的接收，在CW模式可以控制节拍的音调，这个旋钮能在2.3KHz左右调整接收频率，它不影响发射频率和显示频率，但将改变接收频率。

RIT control. The receiver incremental Tuning control is used to fine tune to the received singal .This is used in USB and LSB modes to obtain maximum clarity of reception,and in CW mode to control the pitch of the beat note. The RIT Control can tune the receive frequency about 2.3 KHz. This control will not transmit frequency, or the frequency display, but will change the receive frequency.

RIT control ：收信机微调旋钮是用微调调整使你能收到被认为是标准的信号，在USB和LSB模式使用可以获得最清晰的接收，在CW模式可以控制节拍的音调，这个RIT控制可把接收的频率调整约2.3KHz左右，它不影响发射频率和显示频率，但将改变接收频率。

The proposed algorithm can deal with Carrier Frequency Offset and Sampling Frequency Offset estimation with the presence of frequency dependent In-phase and Quadrature-phased imbalance. Then frequency dependent I/Q imbalance and channel response are jointly estimated.

该联合估计算法能在存在频率相关性I/Q失配的情形下准确获得载波频率偏差和采样频率偏差的估计，并获得频率相关性I/Q失配和信道冲击响应的联合估计信息。

Mechanical strains also regulated the protein and mRNA expression of several differentiation markers, as well as the activation of extracellular signal-regulated kinases, p38 MAP kinase and protein kinase B in a frequency-dependent manner. Furthermore, the inhibition of p38 pathway could block the strain-frequency induced the phenotype modulation of VSMCs, neither ERKs nor Akt. Frequency of mechanical strain, not conditioned medium, regulated the phenotype of VSMCs in a frequency-dependent manner. Rho-GDI alpha was suppressed by the mechanical strain at 1Hz.

采用免疫细胞化学法检测VSMCs形态和排列的变化；RT-PCR和Western blotting检测表型标志分子α-肌动蛋白、肌球蛋白重链(SM1/2)、肌动蛋白相关蛋白SM22α和调宁蛋白(h1-calponin)的mRNA和蛋白水平的变化；抑制剂或RNA干扰阻断可能的信号调节分子的活性或表达，包括p38、细胞外信号调节激酶1/(2extracellular signal-regulated kinases， ERK1/2)、蛋白激酶B和Rho-鸟苷酸解离抑制因子(Rho-guanine nucleotide dissociation inhibitor， Rho-GDI alpha)，研究了不同频率张应变对VSMCs表型转化的影响及其调节机制。

This invention utilizes multiplier frequency of picture frequency to reduce the interference between picture frequency, to recognise the warp of the inverter switch frequency and to ensure this warp.

本发明利用图像频率的倍增频率，一方面减少与图像频率间的干扰，另一方面识别反相器开关频率的偏差，并保障其偏差。

I can not negligent, he should do what?

我不能不在意了，他要做什么呢？

It is very dangerous to swim in the river alone.

一个人到河里游泳是很危险的。