原型大肠杆菌和相应的L型菌接合试验均阳性，但后者接合频率较前者明显低；
Conjugation tests of both parental bacteria and their L-forms were positive, but conjugation frequency in the latter was markedly lower than that in the former. After L-forms of E.
频率域滤波方法虽然可解决时变滤波问题，但这种方法是基于傅里叶变换，在窗口与窗口之间的接合部位会出现假异常。
Although the filtering method in frequency domain can solve the time variant filtering problem based on Fourier transform, the method may appear a false anomaly in conjunct part between Windows.
接合面的位置对结构的固有频率也有较为明显的影响。
The location of joint surface has a close relation with the natural frequency of the structure.
结果表明，当接合点附近有微弯时，高频率的光斑尺寸将明显增加。
It is shown that when there is a slight bending at the vicinity of splice joint, the spot size increases sharply at higher frequencies.
提出了一种间接合成的低相位噪声频率综合器的设计，该频综器用于某机载雷达中，从而要求其在极其恶劣的环境中同样具有良好的性能。
This paper presents a low phase noise indirect frequency synthesizer, which used in airborne fire control radar and is required to operate in a very harsh environment.
本文主要讨论了数字频率直接合成(DDS)技术特点及其应用。
This thesis mainly discusses the Direct Digital Frequency Synthesis (DDS) technique and its applications.
首先，本文对数字频率直接合成(DDS)技术的特点进行介绍，提出一种基于DDS技术的任意波形发生器(AWG)的改进结构。
First of all, this thesis introduces the features of Direct Digital Frequency Synthesis (DDS) technique and gives a new structure of the Arbitrary Waveform Generators (AWG) base on DDS technology.
论文首先基于直接数字频率合成技术提出了一种能够在数字域内直接合成出动态信号中时变多普勒频率的信号合成方法。
Firstly, a DDS-based method for digital-domain synthesis of time-varying Doppler frequency in dynamic GPS signal is proposed in this dissertation.
位于T形接合部上的L形带阻滤波器亦用来抑制第一谐振频率的倍频的谐振。
An L-shaped band elimination filter on the T-shaped joint part is also used for restricting the resonance of the frequency multiplication of the first resonance frequency.
文中分析了雷达与外部电磁环境之间的双向兼容性问题，并对所采取的窄带接收机、数字直接合成（DDS）频率源和副瓣对消技术作了介绍。
We analyze bi-directional compatibility between radar and outside electromagnetism circumstance and also bring a detailed introduction to narrowband receiver, DDS(Digital Direct Syn…
文中分析了雷达与外部电磁环境之间的双向兼容性问题，并对所采取的窄带接收机、数字直接合成（DDS）频率源和副瓣对消技术作了介绍。
We analyze bi-directional compatibility between radar and outside electromagnetism circumstance and also bring a detailed introduction to narrowband receiver, DDS(Digital Direct Syn…
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