变体的

Based on mathematical mechanization method and computer symbolic processing technique this paper carried out a solution by symbolic method for position analysis of robot with octahedral and decahedral variable greometry truss.

基于数学机械化方法和计算机符号处理技术，对八面体及十面体变几何桁架机器人的位置分析进行了符号法求解，成功地将非线性位置约束方程组化简为等价的三角化方程组，分别导出了单变量的16次和48次代数方程，并给出一个数字实例说明这种方法。

Past investigation found the rock in the right dam foundation composing of granite(γ_4~3～γ_5~1) in dyas- trias,which has a very complicated mechanical environment. The complicated phenomenon is as follows: tectonism, alteration, rock mass demobilize, rock mass stress release and other factors.

前期的调查表明其右岸岩体力学环境复杂，表现为：构成右岸坝基岩体主体的二迭～三迭纪花岗岩(γ_4~3～γ_5~1)受构造变动、蚀变、风化卸荷等因素的影响形成了坝基软弱岩带和坝肩上部卸荷松弛岩体。

Variational equations of motion of each flexible link are derived under Jourdain variational principle, and then the mixed algebraic-differential equations of flexible multibody systems are obtained with the kinematic constraint conditions.

用Jourdain速度变分原理建立各机械臂的动力学变分方程，在此基础上根据各物体之间的运动学约束关系，建立柔性多体系统的微分代数混合动力学方程。

The rigid-flexible coupling dynamics of flexible multibody systems with free largeoverall motions is studied for the first time in chapter 6.The equations of the motion forthe flexible multibody system are obtained utilizing Jourdain's velocity variationalprinciple and forward recursive formulation.

第六章首次对大范围运动为自由的柔性多体系统的刚-柔耦合动力学问题进行研究，用Jourdain速度变分原理和单向递推组集建模方法建立了柔性多体系统的刚-柔耦合动力学方程。

The effect of undissolved ferrite amount on contact, impact and bending fatigue properties were studied. The stress relaxation and grain refinement due to occurring of plastic deformation are main reasons of improving the fatigue life.

就未溶铁素体含量对接触疲劳、多冲疲劳及弯曲疲劳性能的影响机理进行研究，局部的应力集中因铁素体发生塑变而得到松弛和细化晶粒是提高疲劳寿命的主要原因。

Martensitic transformation is a kind of specific and valuable transformation in Ni - Al applied field.

镍铝合金中的马氏体相变是一种特殊的并且在应用领域有重要价值的相变。

Increasing the milling time continually,α-Fe of monophase BCC transfer to FeC intermetallic compound.

从X-ray衍射谱的分析可看出，这是由于样品发生了相变，从单相体心立方结构的α-Fe固溶体向FeC金属间化合物转变。x=1的样品，经255h球磨后，样品成为单相Fe5C2金属间化物，它具有单斜晶体结构。

Results: Axial scanning including vertebral arch can show spondyloschisis and other signs. These contained widened or stenosis of the spinal canal, stenosis of he lateral recess, the double margin sign, deformity of the lateral recess, the double margin sign, deformity of the intervertebral disc, denegeration of the joint facet and thickening of the ligamentum flavum. Scotty dog sign were showed in images reconstructed along the direction of vertebralarch.

结果：包括椎弓根层而的轴位扫描均能显示峡部裂和其他伴发表现，包括椎管增大或变窄，侧隐窝狭窄、双边征、椎间盘变形、椎小关节退行性变和黄动心忍性韧带肥厚采用平行于峡部的椎弓长轴MPR、MIP斜矢状面重建能直观显示峡部裂的典型表现－猎狗项圈征，正中矢状面重建能显示椎体滑脱。

Results There was moderate or strong negative correlation among the indexes of the degeneration of intervertebral disc including the relative area of vascular bud, the ratio of the uncalcified and the calcified layer, the quantitation of collagen type Ⅱand the indexes of osteoporosis including the thickness ratio of cortical bone, the relative area of bone trabecula, the density of femoral bone and vertebral body bone, the max stress and straining of bone.

结果 骨质疏松相关指标骨皮质厚度指数、骨小梁相对面积、股骨密度、椎体骨密度与椎间盘退变指标终板血管芽相对面积、非钙化/钙化层比值、Ⅱ型胶原定量之间存在中度到强度的负相关，而与Ⅹ型胶原表达存在中度到强度的正相关，其中椎体骨密度与软骨终板的Ⅹ型胶原相关性最强。

The six data in the age spectra defined an 40 Ar 39 Ar isochron which gives an age of 1862±37Ma.

这一结果表明，虽然变斑晶石榴石中仅仅在显微矿物包体、流体包裹体和晶格缺陷中赋存少量的 K+，但其生成的 4 0 Ar*仍然能够形成稳定的年龄谱。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。