回弹

In this paper, two assemblies of special test equipments have been designed and fabricated by authors in our laboratory: namely Catalyst Molding Process Analyzer and Catalyst Mechanical Process Tester. These new skills are developed for the dynamic studies on whole mold forming process and crushing process of Fe-Cr WGHS catalyst pellet. Based on the orthogonal experimental design, the effects of some factors during the forming process of solid catalyst, such as predensification proportion, calcination time, calcination temperature and content of graphite on the mechanical strength of catalyst pellets are systematically examined, and the molding conditions have been optimized. Based on the experimental data, the relationship between catalyst density and forming pressure are educed, and the physical significances of some related parameters are described. The parameter of macro scopic elastic moduls has been suggested to character the mechanical properties of molding catalyst. The effects of molding pressure on mechanical properties of catalyst pellets are discussed, and results show that there exists a optimal molding pressure for the ideal mechanical properties: when over-high or over-low pressure is applied, the specific surface area and side crushing strength of catalyst pellets will decreased. The "rebound effect" will be undermined by the unsuitable pressure maintain process, resulting in the apparent decrease of mechanical strength of catalyst pellets.

本研究通过自行设计制造的催化剂模压成型过程分析仪（Catalyst Molding Process Analyzer， CMPA）和催化剂力学性质测试仪（Catalyst Mechanical Properties Tester， CMPT），以Fe-Cr系高温变换催化剂片剂为研究对象，对成型过程和受压破碎过程提供了全过程动态研究的新手段；本研究利用正交实验设计方法考察了固体催化剂成型过程中诸因素（包含预密致比例、煅烧时间、煅烧温度和石墨含量等）对催化剂成型体强度的影响，并对成型条件进行了优化；根据实验结果，关联确定了固体催化剂成型过程中的密度－压力关系式，并对方程中诸因子的物理意义进行了描述；提出了一种利用宏观弹性模量来表征成型催化剂的力学性质的方法；研究讨论了成型压力对催化剂成型体强度性质的影响，结果表明：对于催化剂成型体的强度和比表面性质，成型压力存在着一个最佳值，过高的成型压力会导致比表面积和侧压强度的降低；不适当的成型压力的维持时间会破坏&压力回弹&作用，造成催化剂成型体的机械强度明显降低。

In this paper, the linear relationships were predicted theoretically that tensile strength, tensibility and re-spring degree are affected by the cell size distribution character.

本研究从理论上预测了泡孔孔径分布形态对发泡体的抗拉强度、断裂伸长率、及回弹率之间的内在关系。

Based on a lot of experiments, it shows the distinct error between classical theory curve which express the relation of cell diameter, cell density and foam tensile strength , tensibility tensile product and re-spring degree and experiment curve. It also can＇t explain the relation of hole degree , area of cell wall with above four mechanics parameter. But the sub-cluster scale theory was demonstrated successfully to explain the relation of cell structure and foam mechanics property on different mold temperature, mold pressure, mold period and different chemical blowing agent, blowing activator content.

通过大量的实验结果理论分析表明：以往的经典理论存在着很多不足之处，它不能有效地解释孔径、泡孔密度与抗拉强度、断裂伸长率、断裂功、及回弹率之间的理论曲线与实验曲线之间的偏差，也不能解释空隙度、泡孔壁厚与上面四者之间的关系，而群子标度理论则成功地论证了在不同模压温度、模压压力、模压时间及不同用量发泡剂、发泡促进剂条件下泡体力学性能与结构之间的相关性。

In emerging Asia, the unfreezing of trade finance, a turnaround in stocks and hefty fiscal stimulus are powering a rebound.

在新兴的亚洲，贸易金融解冻、股票扭亏为盈以及强大的政府财政刺激都为经济回弹加足了马力。

Experimental study and comparative analys show that it does not affect too much in contrast with river sand when fine aggregate adopts desalted sea sand.

经过对实验数据的分析与处理，得到了细骨料采用河砂、淡化海砂对高性能混凝土抗压强度与回弹值之间关系的影响规律。

In the loudest and fastest staccatos we can also take advantage of the rebound from the keyboard.

在加强快速的断奏中我也可以利用键盘的回弹的优势。

We start from the principle that when a shaft is bent and then released, the stiffer the shaft, the faster it unbends or straightens or unload...

我们从拍子由弯曲到释放（即回复到伸直状态，回弹）的原理上讲起：拍杆越硬，拍子伸直得越快。

Based on a brief introduction of the self-consistent method and the theory of soft foundation dealt with blasting method,this paper calculates some resilient modulus ,which are largely in accordance with the data in the experiments.

简要介绍了自洽方法和爆炸法处理软土地基的工作原理，并用自洽方法计算爆炸法处理的软土地基的回弹模量，计算结果和试验结果符合较好。

Inverted front forks are fully adjustable for compression, rebound damping and spring preload to suit rider preferences

倒立前叉子是完全可调的压缩，回弹阻尼和弹簧预紧力，以适应骑手优惠

Combined with the practice,the paper discussed the importance of detection rebound deflection value for county road reconstruction.

从农村公路建设模式和经济现状等方面通过列举实例论述了检测回弹弯沉值的重要性。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。