分析动力学

A new technology to produce phosphoric acid from low-grade phosphorite and its advantages are described, also the kinetics of decomposition and crystallization are briefly presented.

摘 要］研究利用低品位磷矿生产磷酸的新流程，分析这一流程的若干特点，探讨流程中的酸解动力学和结晶动力学的一些基础问题。

HPLC method of determination of CCU has been developed for the kinetic study. The kinetics of photodecomposition of CCU in various carrier gases have been studied. The photoreaction of CCU in nitrogen and air is of the first order, while in oxygen is closer to that of the second order. The rate constants in nitrogen, air and oxygen are 0.00703/h, 0.0109/hand 0.00445 , and the half-livies are 98. 6, 63. 6 and 62. 7hour respectively.

采用以甲醇一水为流动相的反相HPLC作为分析手段，对灭幼脲在不同载气中的光解动力学作了研究，结果表明，灭幼脲在氮气和空气中的光解反应符合一级动力学形式，而在氧气中的光解则更接近于二级反应形式；在三种气氛中的反应速度常数分别为0.00703h〓，0.00109h〓和0.00445h〓〓，半衰期相应为98.6、63.6及62.7h。

The difficulty of the existing piezoelectricity theory to solvepiezoelectric dynamics problem is pointed out.

以分析横场伸缩振动压电片的动力学为例，指出已有建立在压电本构方程基础上的求解压电体动力学理论的困难。

In order to design lighter and faster hydraulic excavator, a rigid-flexible hybrid modeling method based on rigid multi-body dynamics and finite element method was put forward to study the dynamic characteristic of hydraulic excavator in its whole working cycle. The working equipment with characteristic of time-varying structure was taken as research object, and radial acceleration was computed as tags of key load.

为适应液压挖掘机高速、轻量化的要求，以具有时变固频特性的液压挖掘机工作装置为研究对象，提出了以角加速度判断时变结构的关键工况，利用刚性多体动力学和有限元方法对液压挖掘机在整个作业循环中的动力学特性进行建模和分析。

The progress of reaction kinetics between organic reductant s and Np, Pu is reviewed briefly in the paper.

概要评述了近 2 0年来有机还原剂与Np和Pu的氧化还原反应动力学研究进展，讨论分析了有关反应机理和动力学物化参数，以期为乏燃料后处理流程提供依

Firstly,using the method of concentrate mass this paper establish a non-linear dynamics model of a two-stage gear train with backlashe between the gear pair,and through analysed the dynamics model,the torsional motion differential equations are got , on this basis,then calculate the torsional motion differential equations using Runge—Kutta method ,and discuss how to influence the dynamics characteristic of system when these parameters chage such as mesh frequentcies、 stiffness of the intermediate shaft、the ration of mesh frequentcies.and discuss when the chaos will happen under the change of these parameters.

首先用集中质量法建立系统的含间隙的非线性动力学模型，并根据牛顿力学定理，得到系统的运动微分方程。然后对所建立的运动微分方程运用四阶变步长Runge—Kutta方法进行了求解，并对计算结果进行分析，研究了齿轮啮合频率、中间联接轴的刚度，一、二级齿轮的啮合频率比等参数变化时，对系统非线性动力学特性的影响规律，并讨论了当参数如何变化时会导致系统的混沌响应的出现。

In this paper, dynamics of two shaper mechanisms were analysized with stepmise solving method of equations set.

用动力学方程组逐次求解方法对两种牛头刨床机构进行了动力学分析。

In order to absorb vibration of long test and measurement tubular column due to action of shock load,a dynamic model of absorber was set up base on traveling wave method and compared with common model.

针对在冲击载荷下长测试管柱的减震问题，利用行波法建立了减震系统动力学模型，与以往研究模型进行了比较，分析了减震器在冲击载荷下的动力学特性。

The rigid-flexible coupling dynamics modeling and modal analysis were employed to study the system consisted of square plansifter and flexible suspender.

针对高方平筛和其上固结的柔性吊杆组成的动力学系统，进行了刚柔耦合的动力学建模和振动模态分析。

Firstly, the detailed analysis and calculate of the dynamics parameters as suspensory point load, pure toque of speed reducer shaft etc and kinematics parameters of conventional beam-pumping unit and eccentric placed pumping unit which are in services in oil field have been made combining the basic theory of present beam-pumping unit to provide theoretic foundation for the kinematics and dynamics simulation and optimizing design of pumping unit.

首先，结合现有游梁式抽油机工作原理，对油田在役的常规型游梁式抽油机和异相曲柄平衡游梁式抽油机的运动学和悬点载荷、减速箱曲柄轴静扭矩等动力学参数进行了详尽的分析计算，为游梁式抽油机的运动学和动力学仿真及其优化设计提供了理论依据。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失