The shrink mechanism and process of plastic injection products were introduced. The main effective factors on shrinkage and post shrinkage of plastic products were discussed. The shrink characteristics of plastics in injection process were described by P-V-T state diagrams. 论述了注塑塑料制品的收缩机理和收缩过程,讨论了影响塑料收缩率与制品后收缩的主要因素,通过P-V-T状态图描述了塑料在注塑过程中的收缩特性。
The result shown that the TMA technique is an effective and convenient method for characterising thermal shrinkage in oriented polymer materials. 实验结果表明,TMA是研究和测试取向聚合物材料热收缩的简便有效方法。
In this paper, time-dependent stresses and deformations of steel-concrete composite sections may be calculated with the age-adjusted effective modulus and the concept of differential shrinkage and creep. The non-elastic time-effective questions on long actions can be turned into elastic questions. 本文采用按龄期调整的有效模量和收缩徐变微差概念计算钢-混凝土组合截面的瞬时应力和变形,从而将长期作用下的非弹性时效问题转化为弹性问题处理。
This article carries out overall analysis on the mechanism and influencing factors of dry shrinkage in cement stabilized base materials, and proposes effective preventive measures on the basis of the analysis, in order to reduce dry shrinkage crack in cement stabilized base materials. 对水泥稳定类基层材料干燥收缩的机理、影响因素进行了详细而全面的分析,并在此基础上提出了有效的预防措施,以尽量减少水泥稳定类基层材料的干缩裂缝。
The double mix of expansion agent and shrinkage-reducing agent is an effective way to reduce the drying shrinkage fall of expansive concrete. 膨胀剂和减缩剂双掺使用是减少膨胀混凝土干燥收缩落差的有效措施。
Age-adjusted effective modulus was used to substitute for concrete elastic modular to consider the shrinkage and creep influences of concrete. Combining age-adjusted effective modulus method with finite-element method, finite-element step-by-step analysis method was studied. 该方法是将按龄期调整的有效模量代替混凝土弹性模量来考虑混凝土收缩徐变的影响,并与有限元法相结合的有限元逐步计算法。
At the same time, reasonably laying prestress tendons and improving bending moment layout of the main beam is one of the effective measures to reduce structure shrinkage and to reduce the creeping effects to the deflection. 同时,合理布置预应力索,改善主梁弯矩的分配是减少结构收缩、徐变对挠度影响的有效措施之一。
Conclusion The minimum effective dosage of artemether against 21 d old S.mansoni in mice is 200 mg/ kg. Artemether also exhibits effect against adult schistosomes, including shrinkage and degeneration, and can lead to worm death. 结论蒿甲醚对小鼠曼氏血吸虫21d童虫的最低有效剂量为200mg/kg,可引起曼氏血吸虫成虫萎缩、退化或死亡。
With the age-adjusted effective modulus and step by step method of the finite element, the stress and deformation of composite beams could be calculated, shus the time-dependent problem of concrete such as creep and shrinkage has been changed into elastic ones. 文中采用按龄期调整的有效模量法并结合有限单元步进法来计算钢&混凝土组合截面的应力和变形,从而将混凝土的收缩徐变等非弹性时效问题转化为相应的弹性计算问题。
Through analysis of typical technology for some lost wax casting examples, it is expounded that improvement of casting design with more reasonable technology offers an effective and simple way to obtain highly qualitative and compact castings without porosity and shrinkage defect. 通过对几个典型生产实例的工艺分析,说明用修改精铸件结构设计的方法,使铸件结构更具合理的工艺性,是获取优质精铸件的一条行之有效和便捷的途径。
The age-adjusted effective modulus method is researched. Taking into account the concrete shrinkage and creep, the paper carries on the formula derivation of the finite element basic equation. 重点研究按龄期调整的有效模量法,详细推导了同时考虑混凝土收缩和徐变的有限元基本方程。
This method is effective not only for the point cloud filtering, but also for protection feature information and prevention the volume shrinkage. 该方法不仅有效的进行了点云的滤波处理,而且在保护特征信息以及防止体积收缩等方面也表现出了其优势。