external conversion
1.This paper mainly introduces the principles of the acquisition and output of 4～20 MA DC analog datas input signals from automatic following moder by programmable dual channel D/A converter TLC5618.And givesan example of its application,when one channel of TLC5618 completes D/A conversion,the other channel matched upto simple external cir-cuits completes its D/A conversion after comar-ison one by one by software programming.
2.The relations among MVA/DVA (divinylacetylene), space velocity of acetylene Ug , and total conversion of acetylene x were: for single tube external circulating type, MVA/ DVA=1.1928U g 0.6607 x-0.0818;
3.By comparison with original condition, the increment of conversion yield reached 39%, 62.3 %, 38% and 21.1%, respectively when adding dodecane concentration of 5%, surfactant Tween80 concentration of 5%, ultrasonic irradiate for 10 min, external electron acceptor vitamin3 concentration of 5 mg/L.
