查询词典 fluid dynamics

The molecular photodissociation dynamics is a very important part of molecular reaction dynamics.

分子光解动力学是分子反应动力学的一个极其重要的内容。

Molecular dynamics simulations of NPT (constant pressure and constant temperature) dynamics are carried out to obtain specific volume as a function of temperature for polyethylene , polypropylene , poly-isobutylene , polyoxymethylene , and polydimethylsiloxane .

用NPT分子动力学模拟来获得聚乙烯、聚丙烯、聚异丁烯、聚甲醛和聚二甲基硅氧烷在不同温度下的特征体积。体积玻璃化转变温度通过对模拟得到的V-T作图的曲线的拐点决定。

This paper focuses on the study of launch dynamics for self-propelled artillery. In order to exactly compute the motion of projectile in gun tube and the initial disturbance, the theory of two- phase flow interior ballistic is applied to the study on launch dynamics.

为了更加准确地计算火炮弹丸的起始扰动，将两相流内弹道应用于发射动力学研究。

To minimize the effect of the dynamics of the motor to the dynamics of the parallel mechanism, each real axis is controlled by a PD（proportional-derivative） controller, respectively.

为减少电动机动态对整个动力学系统的影响，每个输入轴分别单独设计一个PD控制器，整个动力学系统包括这些PD控制器。

The radial rectilinear stretching motion is firstly analysed, and its condition is deduced. Then two planetary gear mechanisms are assembled to realize the motion. In addition, the kinematics and dynamics analysis of arm mechanism is done, which provide the theoretic basis for the selection of servomotor and for holding the good dynamics and static performance of the clean robot.

首先对其末端执行器的径向直线伸缩运动展开分析，得出了实现该运动的必要条件，并采用两组行星轮系与连杆机构的组合形式来实现末端执行器的运动，此外还对该机构进行了运动学和动力学分析，为电机的选择以及控制净化机器人的动态性能和静态特性提供理论基础。

Taking the multi-deformable-body dynamics theory as a foundation,the dynamics behaviors of ring gear of the planetary gear set were studied in the process of engagement.

以多柔体动力学理论为基础，研究了行星齿轮内齿圈在啮合过程中的动力学行为。

Based on the theory of the structure dynamics, with the limited element SAP5 programm as the calculating way, a calculatingway of the dynamics intenisity of the sieve s lateral plate is put forward and the reason why this kind of oscillating sieve causes crcak on the lateral plate is analyzed.

以结构力学理论为依据，以有限元SAP5程序为计算手段，提出了一种直线振动筛侧板的动力学强度的计算方法，并分析了这类振动筛在侧板上产生裂纹的原因。

Secondly, method of Taylor series is used to approximate the slow manifold and the O approximation of the slow manifold is given; slow dynamics such as saddle node bifurcation which has been proven to be the same as that for the full system is analyzed; at the same time, fast dynamics including bifurcation conditions and domain of attractor of the stable equilibrium are also analyzed; the attracting region which consists of the stable manifold of the unstable equilibrium and stable equilibrium is given; we found that when the inner flux decay increases, the domain of attractor is enlarged.

首先，给出了电力系统SMIB模型的时间尺度分解，得到标准的奇异摄动模型；其次，利用幂级数方法，给出了慢流形的O近似M〓，分析了在慢流形M〓上的慢动态，得到了慢子系统的鞍结分支值，并证明此分支值与原系统的鞍结分支值相同；分析了快子系统的平衡点和全局分支的存在条件，给出由不稳定平衡点的稳定流形与稳定平衡点形成的吸引域；并研究内部电压对稳定域的影响，发现稳定域随内部电压增加而扩大；最后给出整个系统的稳定平衡点的近似吸引域。

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。

Modern chaotic dynamics provides chaotic study in the energy model with powerful tools, Symbolic Dynamics and Melnikov Method are two of them.

当代混沌动力学研究为能量模型的混沌研究提供了有力的工具，符号动力学与梅尔尼科夫方法就是其中两种。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。