高频率

In recent years, SiC FET power transistor and GaN high electron movability power transistor represent the third generation semiconductor-wide bandgap semiconductor power devices, have advantages of high breakdown voltage, high power density, as well as high output power, high operation efficiency, high operation frequency, wide instant aneous bandwidth, operation in high temperature environment and strong ability of resisting radiation.

近年来以SiC场效应功率晶体管和GaN高电子迁移率功率晶体管为代表的第三代半导体－宽禁带半导体功率器件具有击穿电压高、功率密度高、输出功率高、工作效率高、工作频率高、瞬时带宽宽、适合在高温环境下工作和抗辐射能力强等优点。

Power to switch to a high frequency, high efficiency, high power density, high power factor, high reliability.

使开关电源达到了频率高、效率高、功率密度高、功率因素高、可靠性高。

The frames with low and slowly changing average instantaneous frequencies were identified to be the periodic sonant segments and the frames with high average instantaneous frequencies were identified to be the surd segments based on the characteristics of the average instantaneous frequencies of IMFs derived from speech signals.

根据语言信号特定阶IMF平均瞬时频率的特征，将平均瞬时频率低且变化缓慢的语言帧作为周期性强的浊音段，而平均瞬时频率高的语言帧判别为清音段，组合处理后的结果最终得到语音段数据。

BAW is used to on-line monitor the effluent from IC column.

在实际中，以SPQC-BAW技术对离子色谱流出物进行在线监测，可得到响应信号为频率的色谱图，具有很高的灵敏度；利用本室设计的频率/电压转换电路可将频率数字信号转化为模拟电压信号，从而为常用的色谱工作站或色谱数据处理设备接收、利用和处理，实现IC-BAW自动化分析。

Therefore, established a finite element Stable response model of a horizontal whole string and carried out t the safety varied frequency of gas well after researched the natural seriously transversal vibration and compressional vibration frequency range of tubing string with packer and packerless, so that it make the tubing string to avert the covibration frequency range of natural gas excited.

本文认为以某井高产量稳产时，天然气对油管柱的外激励为简谐激振，因此研究中建立某水平井全井段油管柱稳态响应的有限元力学模型，并获得了在无封隔器和有封隔器情况下的油管柱发生严重横振和纵振的频率范围，提出了天然气安全调节频率范围，使油管柱避开可能引起严重破坏的天然气激励频率区域。

The frequencies of the pacemaker currents from gastric and small intestinal ICC are very similar to the frequencies of rhythmic contraction in murine gastric and small intestinal smooth muscles; ICC network generates higher- amplitude, stabler and more rhythmic pacemaker currents than single ICC does; low concentration of intracellular free calcium is an important factor for generating pacemaker current; calmodulin is involved in the inhibitory regulation of the pacemaker current.

小鼠胃和小肠ICC产生的起搏电流频率与小鼠胃和小肠自律运动的频率非常接近；网络ICC产生的起搏电流比单个ICC稳定、幅度高、频率快； ICC内游离钙浓度的降低是产生起搏电流的重要因素；钙调蛋白在ICC内参与起搏电流的抑制性调节。

The reciprocal effects between the frequency veering and the sensitivity ofmistuning for a bladed disk are studied. The investigation is based on a finite elementmodel. The reason and features of frequency veering of the bladed disk are analyzed.By using the localization parameter, the effects of mistuning on the system modallocalization of the bladed disk are analyzed in the frequency veering region.

分析了叶盘系统频率转向现象产生的原因及其特点；利用本文提出的模态局部化参数，研究了频率转向区域内叶盘系统的高密集模态对失谐的敏感性；分析了频率转向区域内失谐叶盘系统的振动响应局部化特性。

DG1000 operates direct figure to synthesize science and technology, the random that can output an user to be defined oneself is undee, have rich input output, and frequency meter of high accuracy, broad frequency band, frequency limits 100MHz arrives 200MHz, frequency resolution achieves 6 / second.

DG1000操作间接数字分解科技，可输出用户自界说的任意波形，领有丰硕的输入输出，以及高精度、宽频带频率计，频率规模100MHz到200MHz，频率分辨率达到6位/秒。

By parameter(tower total height, shell thickness, meridional curvature) analysis of cooling-tower natural frequency, we find that, the basic natural frequency of cooling tower is sensitive to the top meridional curvature, an approximate formula is proposed based on the parameters, which can estimate the basic natural frequency of cooling tower.

通过对冷却塔自振频率的参数分析，如塔体整高、塔壳厚度、子午线曲率等，发现基础频率对上部子午线曲率较为敏感，并给出了用于估算大型双曲冷却塔基础频率的三参数公式。

Its final target is to fully digitize the analogue receiver. The all digital receiver not just means digitizing every unit of the analogue receiver, but is a new receiver architecture. The two outstanding characters of this new architecture is: 1 It uses a high stable oscillator to generate a fixed frequency source. And both the sample signal and the local carrier required are obtained from it. 2 Once the received signal has been sampled by a high speed A/D converter, some digital signal processing algorithms will be used to realize all further processes, such as digital down-converting, match filtering, symbol timing, channel equalizing, carrier synchronizing, demodulating and decoding.

全数字接收机并不是简单地将传统的模拟接收机中所有的部件数字化的结果，而是一种全新的接收机体系结构，这种新的体系结构具有两个最为突出的特点：1）采用高稳定度晶体振荡器产生一个固定的本地频率源，接收机中所需的采样时钟信号和本地载波均从这一固定频率源得到；2）接收信号一旦经过高速模数转换后，余下的工作如频率变换、匹配滤波、定时同步、信道均衡、载波同步、符号解调、判决与译码等全部由数字信号处理算法来实现。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。