负浮力 meaning in Chinese

negative buoyance
negative buoyancy

We succeeded in crossing hanjing river of zhong - wu gas pipeline project , dawen river of jining branch line of west - east gas pipeline using the technique of trenching in water , controlling negative buoyancy and bottom towing without water interception
公司采用带水大开挖成沟，控制负浮力，管道底拖法等施工工艺，在江河不断流的前提下，成功完成了忠武输气管道襄樊支线汉江穿越、西气东输冀宁支线大汶河穿越等工程。
The mechanism of the downburst formation was also investigated based on the cloud microphysics of the simulated storm and it was found that this downburst was primarily produced by hail loading , and enhanced by hail melting and rain evaporation . and the loading and the melting of hail played a very important role in producing the downburst . the gale at the surface was caused by the severe downburst
从云微物理学角度分析了此次局地性大风的形成原因，认为由高空冰雹粒子的拖曳产生的负浮力作用是促发强下沉气流产生的主要原因，其次是冰雹的融化和雨水蒸发冷却对下沉气流起加速作用，冰雹的拖曳和融化作用对下沉气流具有决定性的作用。