The formula to calculating head losses in the contraction section were revised.
并对收缩段水头损失的计算公式进行修正。
A method that can be used to design, manufacture and test the contraction section of a wind tunnel is presented.
介绍了一种简洁有效的低速风洞收缩段的设计、加工以及校验的方法。
Based on the numerical simulation, the check gate contraction section and the vertical-curve section of the emptying tunnel are optimized.
通过数值模拟方法对放空洞检修闸收缩段和龙抬头竖弯段进行了优化。
Several factors affecting on contraction deformation of thick section injection moulding articles were investigated. Some practical proposals were given.
探讨了影响注射成型厚壁塑料制品收缩变形的一些因素，提出了对实际生产有指导作用的建议。
Major causes of cracks are contraction deformation in early stage, too complicated and changeable geologic setting, improper section shape of the tunnel, wrong practice of NATM construction, etc.
裂缝产生的原因主要是早期收敛变形，地质条件复杂多变，隧洞断面形状不当，新奥法施工运用欠妥等。
The entry convergent flow pattern was observed with flow visualization technique when the resin melt flowed through a die featuring abrupt contraction in cross-section of channel and axial symmetry.
应用毛细管流变仪测量了在接近实际挤出工艺条件下低密度聚乙烯熔体的流变性质； 应用流动可视化技术，观测了试样熔体流经突然收缩的轴对称口模时的入口收敛流型。
The entry convergent flow pattern was observed with flow visualization technique when the resin melt flowed through a die featuring abrupt contraction in cross-section of channel and axial symmetry.
应用毛细管流变仪测量了在接近实际挤出工艺条件下低密度聚乙烯熔体的流变性质； 应用流动可视化技术，观测了试样熔体流经突然收缩的轴对称口模时的入口收敛流型。
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