查询词典 ultra-low frequency

The method was proposed to compensate the residual cumulative error in the project, and the optical frequency multiplication effect on residual cumulative error is analyzed, and the model of laser heterodyne interferometric fast ultra-precision measurement is proposed.

为实现激光外差干涉快速超精密测量，通过分析测量棱镜三维运动对激光多普勒频移的影响，针对传统激光外差干涉测量模型存在的原理性残余累计误差，而且误差存在累计现象，提出了在工程中补偿残余累计误差的方法。

It includes radiological imaging physics, radiation oncology physics, nuclear medicine physics, the use of non－ionizing techniques such as nuclear magnetic resonance, ultra－sound, microwaves, radio frequency waves, and lasers, as well as health physics.

医学物理包括放射肿瘤物理(radiation oncology physics， ROP)、医学影像物理(medical imaging physics， MIP)、核医学物理(nuclear medicine physics， NMP)，其他非电离辐射如核磁、超声、微波、射频、激光等物理因子在医学中的应用，和保健物理(health physics， HP)等分支内容。

Measurement system of ultra wide band frequency response based on optical heterodyne technique.

基于光外差技术的超宽带频率响应测量系统。

Then, we do experimental research on the single frequency and linewidth narrowing of fiber ultra-short linear cavity laser.

其次，我们在第二章理论分析的基础上，对单频单偏振环形腔窄线宽光纤激光器进行了实验研究。

Therefore, the ultra-short beam current pulse of 2ns is able to be perfectly reconstructed. Through data processing, singular points, part of high-frequency noise and background noise are eliminated.

通过后期的信号处理，剔除了采样数据中的奇异点、部分高频噪声和本底噪声，消除了由于触发和被测信号不同步的客观条件造成的波形晃动。

The new nanoprocess technology will be the only way for ultra large-scale integrated circuit and high frequency electronic component.

新型纳米加工技术将是制备超大规模集成电路和高频电子元器件的必由之路。

This article introducts the MIMO-OFDM application background and themarket prospect,analyzes MIMO and OFDM respective good and bad points and the union complementarity, elaborates the MIMO-OFDM core technologies that carries on the computer simulation to realize, and ultimately solves the problems whichthe new generation of communications faces,such as the large capacity, ultra-high speed, the frequency of resistance selective fading efficiently.

本文通过对MIMO-OFDM的应用背景及市场前景的介绍，分析MIMO和OFDM各自的优缺点和结合的互补性，阐述MIMO-OFDM核心技术并对其进行计算机仿真实现，有效解决新一代通信面临的超大容量、超高速率、对抗频率选择性衰落等问题。

The multipath effect is an avoidless problem which the tracking radar and the searching radar among CIWS has to face. This paper analyses the form of the multipath effect on geometry, emphasizes the distance difference between the direct wave and the reflected wave, according to this inherent characteristic, the paper introduces the theory of HRR to the design of radars among CIWS, discusses the spike pulse technology and ultra wide hand technology which often be used, finally proposes the method of time-frequency code to obtain the high range resolution and avoid the multipath effect.

多路径效应是近程反导武器系统中的搜索雷达和跟踪雷达均无法避免的问题，文中分析了多路径效应形成的几何原理，并根据多路径效应中的直射波与反射波具有路程差的固有特性，将高距离分辨率雷达信号理论引入到近程反导武器系统的雷达中，讨论了实现高距离分辨率的窄脉冲和超宽带技术，最后提出了目前较易实现的时间－频率码合成高距离分辨率的办法。

Objective To investigate the use frequency of ultra-violet absorbents in sunscreen cosmetics in China.

目的 研究我国防晒化妆品中紫外线吸收剂的使用频度。

The ultra- frequency skin plastic operation has been utilized in clinical practice for 24 years, and can treat 105 kinds of benign skin neoplasm including various nevi, warts, spots, knurls, scars, birthmarks and removal of tattoo colorants.

临床应用24年能治疗各类痣、疣、斑、瘤、减皱、瘢痕、胎记、去除纹刺色素等皮肤深浅层良性赘生物105种病变。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失