Objective To observe the effects of positive pressure ventilation (PPV) on hemodynamics and cardiac function of canine and study the mechanism of the influences of PPV on heart function.
目的观察正压通气时心内瓣口血流速度和左、右心功能的变化，研究正压通气影响血流动力学机制的新理论。
2
Starting with this mechanism, compares underfloor distribution with displacement ventilation in air distribution, ventilation performance, air quality and thermal comfort, etc.
从原理出发，对地板送风与置换通风在气流组织、通风效率、空气品质和热舒适等方面的特性进行了比较。
3
This paper elaborates on dust emitting mechanism, controlling measures and the design of ventilation and dust collecting system.