purity control

Quality Control ol High Purity Water, Gases and Chemicals for Mega-bit Integrated Circuits

兆位电路用高纯水、气和化学试剂的质量控制

A new process of synthesizing tribromide phenol was developed by control speed crystallization technique. The purity of the product got from the test could reach over 99.5%.

以双氧水作为氧化剂，乙醇作为溶剂，采用控速结晶技术开发研究了一步法合成三溴苯酚的生产新工艺，所得产品游离溴低，原材料消耗低，产品纯度99.5%以上，达到国外同类产品技术水平。

Control of the chemical purity of WFI presents few major problems.

注射用水化学纯度的控制是主要问题.

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。

Nonlinear Process Model Based Control Schemes for High Purity Internal Thermally Coupled Distillation Columns

高纯度内部热耦合精馏塔的非线性过程模型优化控制方案