Affected by some factors, such as the channel geometry, fluid boundary condition and material properties, bubble formation process is complex.

微通道内气泡生成机理受到通道几何尺寸、流体流动边界条件、流体物性等多种因素影响，过程非常复杂。

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When the radius-to-thickness ratio, constraint condition and material parameters are given, the buckling mode is from axisymmetric to unaxisymmetric as impact velocity increases.

当径厚比、约束条件、材料参数等不变时，随着冲击速度的增大，屈曲由轴对称变为非轴对称。

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To improve your chances of getting full credit, provide a sales slip or gift receipt, return the item in new condition, unopened, and with all packaging material.

FORBES: Returning A Gift? What You Need To Know About This Year's Return Policies

So does the material's hardness, and especially its surface condition.

ECONOMIST: Aircraft fatigue