Pure tone hearing thresholds of conventional ( 125 Hz to 8 kHz ) and ultrahigh frequency ( 8 kHz to 20 kHz ) were examined .

测定常规频率（125Hz～8kHz）及 超 高 频率（9～20kHz）的纯音听阈。

Propagation of the ultrahigh frequency ( UHF ) radio wave in the underground tunnel

地下巷道中UHF 特 高频无线电波的传播

The transverse wave propagation in carbon nanotubes / polymer composites laminated structures under ultrahigh frequency ( about 1THz ) was studied based on the multiple-elastic-beam model . Effects of the volume ratio and chiral vectors of carbon nanotubes on transverse wave propagation were analyzed .

通过多层弹性梁模型研究了碳纳米管/聚合物复合材料层合结构在 高 频率（1THz左右）下的横波传播，分析了碳纳米管的体积分数和手性对其传播的影响。

Frequency - doubled experiment of ultrahigh frequency CW actively mode - locked Nd : YAG laser

超 高频CW主动锁模Nd：YAG激光器的二倍频实验研究

In this dissertation a high sensitivity high spatial resolution micron moire method and its correlative techniques of ultrahigh frequency grating fabrication and digital image processing are presented .

本文提出并实现了在测量灵敏度、空间分辨率等方面均满足细微观力学实验测量要求的微米云纹方法以及相关的 超 高频精确制栅与条纹图像的数字化分析处理技术。

This paper presents that developing ultrahigh frequency pulse EDM generator of adjustable duty ratio by CPLD based on the characteristic of CPLD complete hardware logistic .

从CPLD具有完全硬件逻辑的特点出发，提出了用CPLD发生占空比可调的 超 高频电火花加工脉冲 信号 的 设想。

The influences of initial stress on the vibration and transverse wave propagation in carbon nanotubes under ultrahigh frequency ( above 1THz ) were investigated .

本文研究初始应力对碳纳米管在 极高 频率（大于1THz）下横波传播的影响。

A method for measuring the phase characteristics of ultrahigh frequency modulating light by optical phase shift is proposed .

提出采用光学移相办法测量 超 高频调制光相位特性的一种方法。

An Ultrahigh Speed Sampling Method Based on Frequency Division Multiplex

一种 超高速 频分多路数据采样方法

Using the time process a higher precise can be reached and ultrahigh resolution of perplexing frequency will be obtained . A detailed frequency mixing analyse process of two comparison signals is given .

系统利用时间处理方法实现时间和 频率的高精度测量，可以进一步解决 特 高分辨率的复杂 频率的测量。文章对两个比对信号的混频过程进行了详细的分析。

Along with a very fast speed development of global economy especially the advancement and popularization of Internet of Things the requirement of ultrahigh frequency ( UHF ) RFID system is becoming increasingly pressing .

随着经济的飞速发展，尤其是物流网的提出和推广，人们对 超 高频（UHF）段远距离非接触电子标签系统的需求越来越迫切。

New method of fabricating ultrahigh frequency grating

一种制作 超 高频全息光栅的新方法

Radiation of ultrahigh frequency microwave with ultrashort optical pulses

用超短光脉冲产生 超 高频辐射

Design of Digital and Intelligent Ultrahigh Frequency Millivolt Meter

数字式智能 超 高频毫伏表的设计

Developing Ultrahigh Frequency Pulse EDM Generator of Adjustable Duty Ratio

占空比可调的 超 高频电火花加工脉冲电源的研制

The results suggested that the efferent AP of GSN had obvious increase resulted from brain injury particularly which increased were striking in 25 seconds as sever head injury as well as the ultrahigh frequency AP occurred and its numbers oversteped 10 to 15 times than STAP .

结果表明，脑损伤可使GSN传出的AP增多，尤其是严重脑损伤时，AP于25秒内即明显增加，且有 超 高频AP出现，其脉冲数高于STAP10～15倍。

A Study on Ultrahigh Frequency Polysilicon Emitter Bipolar Transistors

超 高频多晶硅发射极晶体管的研究

Present situation and Prospect of ultrahigh frequency method based research of on-line monitoring of partial discharge in gas insulated switchgear

基于 超 高频法的GIS局部放电在线监测研究现状及展望

This method is not effective for ultrahigh frequency measurement because it is difficult to multiply or divide a ultrahigh frequency .

在利用该方法测量 特 高 频率时是非常困难的，因为对 高频进行倍频或分频是十分困难的，从而也就造成了特高频测量的主要困难。

Research on Technology for Measuring Ultrahigh Frequency

关于 超 高 频率测量技术的研究

On the basis of these research and design the RFID reader antenna which used in the electronic toll collection system ( ETC ) . Then This paper introduces a ultrahigh frequency circularly polarized ( CP ) rectangular microstrip antenna on air substrate .

在此基础上，研究和设计了可在电子不停车收费系统（ETC）应用的RFID读写器天线。然后，设计了一种以空气为基板的 超 高频（UHF）圆极化矩形微带天线。

All the average methods for measuring ultrahigh frequency are based on the processing of frequency the method for which is frequency mixing or harmonic mixing .

所有针对 特 高 频率测量最基本的方法都是建立在对频率信号处理的基础上，而最常用的处理方法是混频或谐波混频的方法。