超声波对三水醋酸钠相分离及结晶的影响

The effects of ultrasonic radiation on phase separation as well as the crystallization of sodium acetate trihydrate,a typical salt hydrate phase change material (PCM),were studied experimentally.It is shown that ultrasonic radiation may inhibit phase separation to a certain degree.The influence of ultrasonic radiation on crystallization is also found.The addition of PCM grain can inhibit supercooling effectively.The crystallization is related to the supercooling degree.Furthermore,the effects of ultrasonic radiation on inhibiting phase separation of salt hydrates are discussed based on theoretical analysis.     

带压堵漏技术在燃气抢修的应用

介绍带压堵漏技术的发展过程和特点,探讨燃气管道带压堵漏方法(卡具注胶堵漏、钢带捆扎堵漏、磁压堵漏、塞楔堵漏)和管道补强技术,阐述了常见漏点的带压修复.