电水锤粉碎机

电水锤粉碎机,是国营上海第一纺织机械厂的设计工程师和工人同志协作创制的染料粉碎机,七十分钟左右就可磨碎五公升的染料,磨细到千分之一公厘,大大地提高了生产率,目前在国内尚属第一合。现已试制成功,准备在国庆节献礼。本文简单地介绍了该机的构造及操作程序。     

三醋酸纤维素中微量硫的快速测定——氧弹比浊法

在三醋酸纤维素生产的酯化过程中,因使用硫酸作为催化剂,因而在产品中存在少量的纤维素醋酸硫酸混合酯。由于纤维素醋酸硫酸酯的不稳定性,它在温度、空气湿度、含水量、酸度等外界条件的影响下产生水解作用,会使三醋酸纤维素产生泛酸现象。因而含硫量高的三醋纤不能久存,否则     

应用于生物医疗的0.6-V 8.3-ENOB 异步时序逐次逼近型模数转换器

A microwatt asynchronous successive approximation register （SAR） analog-to-digital converter （ADC） is presented. The supply voltage of the SAR ADC is decreased to 0.6 V to fit the low voltage and low power require- ments of biomedical systems. The tail capacitor of the DAC array is reused for least significant bit conversion to decrease the total DAC capacitance thus reducing the power. Asynchronous control logic avoids the high frequency clock generator and further reduces the power consumption. The prototype ADC is fabricated with a standard 0.18 μm CMOS technology. Experimental results show that it achieves an ENOB of 8.3 bit at a 300-kS/s sampling rate. Very low power consumption of 3.04 μW is achieved, resulting in a figure of merit of 32 fJ/conv.-step.