The direct synthesis method has the merits of requiring no calcining shorter producing period and lower costs.
直接法的优点在于产品不必经过焙烧，生产周期短，成本低等。
Therefore, it is advantageous to use a direct synthesis method without optimization whenever this is applicable.
所以，使用一个直接综合方法没有优化是有利的，每当这是可适用的。
A detailed study for the synthesis of hexabromobenzene by means of direct bromination has been conducted, and some modifications to the classical method were proposed.
对直接溴化法合成六溴苯作了系统的研究，并对文献方法进行了一系列的改进。
A synthesis method is propsed to prepare metal nitrides by direct nitridation of metals in static nitrogen atmosphere at high temperature.
提出了在高温和静态氮气氛下利用金属与氮气直接反应制取金属氮化物的合成方法。
This article USES the direct double decomposition method to synthesis zinc gluconate, through adding ethyl alcohol to reduce its watery solution solubility and to obtain its crystal.
采用直接复分解法合成葡萄糖酸锌，通过滴加乙醇降低它在水溶液中的溶解度从而得到它的晶体。
This paper introduces the theory of the phase-locked loop (PLL) and the direct digital synthesis (DDS), a method to improve the precision of DDS and reduce its phase truncation error is also given.
介绍了锁相环(PLL)技术和直接数字式频率合成(DDS)技术的基本工作原理，给出了一种提高DDS输出频率精度及减小其相位截断误差的方法。
It was found that the reaction of synthesis of lead stearate by direct method in aqueous medium could be accelerated markedly by ammonium salts.
研究发现铵盐对水介质直接法合成硬脂酸铅反应具有显著的催化加速作用。
The direct digital frequency synthesis (DDS) is a kind of new frequency synthesis method. It has high frequency resolution, fast frequency switching speed, etc.
直接数字频率合成(DDS)是一种新的频率合成方法，具有频率分辨率高、切换速度快等优点。
This paper introduces a design of Direct Digital Frequency Synthesis(DDFS) based on CPLD, and describes clearly the design method of a multi-function waveform generator using DDFS.
本文介绍了一种基于CPLD的直接数字频率合成（DDFS）的实现方法，详细阐述了采用此技术设计多功能信号发生器的方法。
Based on the summery of research findings by the predecessors, the invention is novel in direct synthesis of amide surfactants by vacuum-amphoteric method without ring closing reactions.
本发明在总结前人研究成果的基础上，不经过关环过程，创新性地采用真空—两性化法直接合成酰胺型表面活性剂。
And the method of DDWS (direct digital wave synthesis) is adopted to realize the signals of MFSK (multi-frequency shift keying) and OFDM (orthogonal frequency division multiplexing).
采用DDWS(直接数字合成)方法，产生了MFSK (m元频移键控)和OFDM(正交频分复用)两种水声通信信号。
The synthetic method is novel in the direct synthesis of amide surfactants by vacuum-amphoteric method without ring closing reactions.
本发明方法不经过关环过程，创新性地采用真空―两性化法直接合成酰胺型表面活 性剂。
Digital look up table method for synthesizing periodic signals is the most popular technique for direct digital frequency synthesis.
数字查表法合成周期信号是一种最常用的直接数字频率合成技术。
Due to intense oscillation of these integral, calculation using direct numerical integral, i. e., GPSS (the generalized point source synthesis method), is complex.
由于这类积分的强烈振荡性，直接数值积分，即通常的广义点源叠加方法(GPSS)，计算比较复杂。
The invention relates to a catalyst for use in the direct synthesis of dimethyl ether from a synthesis gas, a preparation method and use thereof.
本发明涉及一种用于合成气直接合成二甲醚的催化剂及其制法和应用。
Study of synthesis of calcium stearate by direct method in aqueous medium;
研究了硬脂酸和氧化镧在催化剂作用下直接合成硬脂酸镧的方法。
A novel digital watermarking scheme based on synthesis and separation method of direct and alternating signal is proposed in chapter 4.
第四章根据直流和交流信号的合成和分离方法，探索了一条频率域鲁棒性水印的新思路。
From the view of kinematical unit and kinematical characteristics of the robot end effector, a novel method for the direct solution of type synthesis of parallel robot was brought forth.
从机器人运动单元和机器人末端运动特征出发，给出了并联机器人的构型正解新方法。
MMW high resolution radar range profile two-step stretch processing method direct digital synthesis (DDS).
标 签 毫米波高分辨雷达距离像双脉冲伸缩处理直接数字合成（DDS）。
After the sequence passes through digital-to-analog converter and low pass filter, the desired frequency sweep signal is synthesized by the method of direct digital synthesis.
该序列通过数-模转换器和低通滤波器后，产生出频率扫描信号。
After the sequence passes through digital-to-analog converter and low pass filter, the desired frequency sweep signal is synthesized by the method of direct digital synthesis.
该序列通过数-模转换器和低通滤波器后，产生出频率扫描信号。
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