利用浅水波正压模式研究了环境流场切应变率对台风移动的影响。
The role of shear strain rate of an environmental flow in typhoon propagation is investigated using a shallow water model.
风扇环形外腔产生的正压湍流射流在内腔负压汇流作用下形成锥形风幕流场，将处于流场范围内的气体及粉尘严密封闭起来，使安全生产得到保障。
The tapered windscreen flow field of the fan is composed of the outer ring turbulent jet and the inner sink, which tightly closes gas and dust to ensure the safety production.
第一、二代喉罩对有的食管反流不能完全防止误吸，对需要进行高压正压通气的使用受到一定的限制。
The LMA of first and second generation can not prevent aspiration resulting from esophageal reflux completely, which leads to its limited application in patient…
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