Factors affecting pile - soil stress ratio are discussed and the discussions show that pile - soil stress ratio is not a constant and varies with the change of influential factors 同时研究了桩土应力比的影响因素，结果表明，桩土应力比并非固定值，而随着影响因素的变化而变化。
Fourth , physical constants ? such as newton ' s and coulomb ' s constants , which appear in the equations of physics and determine the properties of nature ? no longer have arbitrary , fixed values 第四，物理常数（出现在物理方程式中，并决定大自然的性质，如牛顿常数与库仑常数）不再具有任意选定的固定值。
The concept that speed of light has a fixed value and is independent of the source of motion , and that nothing material can reach or surpass the speed of light has shocked the world in the beginning of the 20 century 而光速有一固定值而不随运动源改变的观念成为二十世纪初期惊天动地的一笔，没有任何带有讯息的东西可以超越光速。
3 . for a given size cavity with a given size slot , the microwave power coupled into the cavity will reach the maximum value while the length of metal block is at a certain value under the condition of resonance ( 3 )固定腔体和孔缝尺寸,在共振条件满足的情况下,当方形金属块边长为一固定值时,耦合到腔体内的微波功率出现一个极值点。
The emulation computation shows its availability . and taking the manufacturing process of the solid rocket motor shell for example , value of process route as objective and cost of process route as constraint , an optimization process is obtained using aga 最后，针对固体发动机壳体制造工艺方案优化问题，以工艺路线的总价值系数为目标函数并以总成本小于某固定值作为约束条件，采用aga得到了一条最佳工艺路线。
Thirdly , it simulated the pumping circuit & dividing circuit with the widely used software matlab / simulink . the displacement of the rod piston and the impact of hydraulic are analyzed in the different input flow ( frequency of pump ) and different reversing time . it found out the cause of hydraulic impact ( one - to - one incorrespondence between the response time of dividing circuit and the operation time of rod piston ) , and gave some methods to weaken hydraulic impact . in the final part of the paper , the reliability of the theory analysis is further verified by the experiment of hydraulic system 首先在流变学原理的基础上，深入分析混凝土在输送管道内的流动状态，得出混凝土泵的负载特性方程；然后根据功率键合图的建模方法，建立泵送回路和分配回路的数学模型，并运用仿真软件matlab simulink对泵送和分配回路模型进行了仿真，分析了在不同的输入流量(泵送频率)和换向时间下，活塞杆的位移和系统的液压冲击情况，找到了引起液压冲击的根本原因(即分配回路的响应时间(固定值)与活塞杆的运动时间(变化值)不相匹配) ，并提出了相应的改进方法。
