纯运动学

On the basis of introduction of kinematic analysis methods, the paper founds the stationary coordinate system and the wheel coordinate system respectively. Meanwhile, the kinematic constraint equations of the standard centered orientable wheel is founded on the assumption that there is no slippage in normal direction and pure rolling in tangential direction of the wheels.

在简要介绍常规的运动学分析方法的基础上，建立了相关的惯性坐标系和滚轮坐标系，并根据滚轮在法向无滑动、切向作纯滚动的假设建立了中心定位轮的运动约束方程。

Kinematics model of the suspension be reduced to truss structure, but as each bar is absolutely rigid, hinge point is also considered to be only a pure rotation without any deformation of rubber parts, such results have a certain margin of error.

运动学模型中把悬架简化成杆系结构，而各个杆件看成是绝对刚性的，铰点处也认为是只有纯转动而无任何橡胶件的变形，这样所得的结果就有一定的误差。

First, based on the analysis and comparison of wave breaker indices defined by geometric, kinetic as well as dynamic stability, which were verified by observation, the value α, which is equal to H/ by Miche' s result and may be modified by Goda' s results, is suggested as the wave breaking criteria. The applicable values of α for pure waves or wave-current co-existing field are given.

首先，基于对波浪破碎的几何学、运动学及动力学三种指标的分析比较和观测资料的验证，本文提出可以合田良实的结果为基础修正Miche的H／=α值，并提出了适用于纯波及波浪与水流共存时的临界α值。

Methods: 7 calf lumbar spine specimens (T13~S2) were biomechanically tested under pure moment of 10Nm loading with Tenor pedicle screw system as the fixation device. Range of motion and intradiscal pressure were measured in all unfused segments and compared among the control group, the single-segment-fixed group (L45) and the double-segment-fixed group (L3~L5), and the correlation analysis and comparison between the increments of kinematic index and intradiscal pressure were performed.

取7具小牛腰段脊柱标本(T13~S2)，以Tenor椎弓根螺钉系统作为固定器械，在10Nm纯力矩加载下进行生物力学测定，测定各活动节段的运动范围和椎间盘内压，比较完整对照组、L45单间隙固定组和L3~L5双间隙固定组间上述指标的变化，并对运动学指标和椎间盘内压增量进行相关分析和比较。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。