The optical purity of cis-R ( + )-and cis-S (-)-DCCA was 93.7 % and 81.8 % , respectively.

While print art born from typography has dismantled the function of image copy undertaken for centuries and has entered the palace of modern art as a kind of art mode with purity and singularity.

而诞生于印刷术的版画艺术，已完全卸掉它负担了几个世纪的复制图像的功能，以一种纯粹的独具魅力的复数艺术，进入现代艺术的殿堂。

The numerical analysis of this ECRM shows that this configuration nay operate at millimeterand submillimeter wavebands effectively and provide very high output power with high mode purity.

前者使它能有效地工作在直到亚毫米波段，后者能提供强大的输出功率。此外谐振腔优异的模式分割能力有利于提高模式纯度并保证稳定的工作。

Effects on mode purity of the parameters of input coupler structure are compared and a wide-band, high mode purity input coupler is designed.

比较了耦合器各个结构参数对模式纯度的影响，最终设计出了高模式纯度宽频带输入耦合器。

An input coupler for the Ka-band second harmonic gyroklystron is proposed and studied using three-dimensional electromagnetic code in this paper. High mode purity of a circular TE_ ( 021) mode in an input cavity is obtained.

研究结果表明，该输入耦合器具有较高的能量耦合效率，并能在Ka波段获得高纯度的TE021谐振模式。

With the help of field match method and HFSS, an input coupler with high mode purity is simulated and optimized.

利用场匹配方法优化设计了输入耦合器，利用高频模拟软件HFSS分析了耦合器中的模式纯度。

Effective air handling and regeneration system is needed to wipe off harmful impurity inside enclosed space and to maintain required air purity and necessary gas element since the air inside the enclosed space can't exchange with the atmosphere.

封闭舱室不能与大气中的空气进行交换，必须去除舱室中有害杂质，维持必需的气体成分和纯净度，需要一套有效的空气调节和再生装置来完成这一任务。

On certain degree, it may be said that landscape poems were born out of poems of metaphysics, which gave the former the air of purity, and the thinking of Lao Tsu and Zhuang Tsu made people yearn towards the nature.

在一定程度上可以说玄言诗孕育了山水诗。玄学使山水具有清越之气，老庄思想使人们向往自然。

Application and management of air purity technique in operation room

空气洁净技术在手术室的应用及管理

A Comparative Study on Air Purifications by Effective Purity Ventilation and by Ultraviolet Irradiation

有效清洁自然通风与紫外线照射空气净化作用对比研究

A frequency Synthsizer wtih high spectrum purity, low noise level and fast hoppingcapability is necessary in frequency hopping communication system.

在跳频通信系统中需要频谱纯度高、噪声电平低和具有快速跳频能力为频率合成器。

Dielectric Resonator Voltage Controlled Oscillators ( DRVCOs) are widely applied in microwave oscillators because of their excellent phase performance, spectrum purity and stability.

介质谐振器压控振荡器（DRVCO）由于其优异的噪声性能、频谱纯度和稳定度广泛应用于微波振荡源中。

The source consists of a microwave phase-locked loop and a new type of automatic frequency control circuit. Chief factors to influence spectrum purity of microwave output signal and phase noise are analyzed.

该稳定本振源由一个微波锁相环路（PLL）和一种新型自动频率控制电路（AFC）组成，文中分析了影响微波输出信号频谱纯度和相位噪声的主要因素。

The Freguency Spectrum Purity Analysis for an Output Signal of a Digital Frequency Synthesizer

数字式频率合成器输出信号频谱纯度的分析

It leads to constant performance, higher spectrum purity and higher frequency stability.

实验结果表明，所研制的高精度频率信号源性能稳定、频谱纯度较高以及频率稳定度较高等优点。

The generation and real-time output of waveform data in segmentation make signals have better frequency resolution and spectrum purity than traditional frequency synthesizing.

同时采用分段产生波形数据实时输出信号的方式，使得频率分辨率和输出频谱纯度比之传统的数字频率合成更优越。

PLL has excellent character of narrowband slot, making locked frequence has the same frequence stability and spectrum purity, and has excellent performance spur reduction.

锁相环有良好窄带跟踪特性，使被锁定的频率具有与参考频率一致的频率稳定度和频谱纯度，对杂散的抑制性能良好。

The frequency synthesizer is the critical part of the transceiver, because it could meet the high requirement for the frequency stability, spectrum purity, frequency range and the number of output frequencies.

而频率合成器是射频收发机中的关键部分，它能满足对频率稳定度、频谱纯度、频率范围和输出频率个数等的较高要求。

To increase the DDS spectrum purity, the non-idea SCMP was optimized.

为进一步提高DDS的频谱纯度，可以对非理想SCMF误差进行优化。

The paper discusses on DDS spectrum purity improvement, and gives the circuit scheme.

对如何提高DDS输出频谱纯度进行了探讨，并给出电路解决方案。

Project of the fine spectrum purity signal source

一种高频谱纯度合成信号源实现方案