Through an analysis of the forces acting on a weft which is inserted by air-jet in a loom, a differential equation of weft flying movement is estabilislied.
本文通过对喷气引纬过程中气流对纬纱作用力的分析，建立了纬纱运动的微分方程。
2
Differential stress is commonly produced when external forces act on a given solid body. It may cause deformation of crustal materials and generate various kinds of structural features.
另一部分是差应力，固体中受外力作用普遍产生差应力，它引起地壳物质变形，产生各种构造形迹。
3
The differential deformation between vertical structural members of the Shanghai Tower can cause secondary internal forces in horizontal structural members.