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Friction and wear behaviors of Ti6Al4V alloys against GCr15 steel under dry sliding were investigated on high-speed pin-on-disc tribometer. Contact temperatures due to friction heat were measured by a thermocouple inserted into the hole of the Ti6Al4V pins. Morphology, composition and phase structure of the surface and subsurface for Ti6Al4V were examined by means of scanning electron microscopy, X-ray diffraction and transmission electron microscopy.

在高速销－盘式摩擦磨损试验机上考察了Ti6Al4V销与GCr15钢盘摩擦副的干滑动摩擦磨损行为，并在线测量了销试样的摩擦接触温度，利用扫描电子显微镜、X射线衍射仪及透射电子显微镜分别对Ti6Al4V摩擦表面和次表层的微观形貌、组织成分、相结构进行研究。

It is very improtant to cut down the production costs of AKD by means of recycle triethylamine of from by－product triethylaminehydrochloride.

摘 要：从副产物三乙胺盐酸盐中回收三乙胺对降低AKD生产成本至关重要。

Moreover, the decomposition of pyrite and formation of troilite were discussed step by step by means of several laboratory experiments.

通过实验手段逐步分析黄铁矿转变成陨硫铁过程中的各个环节，深入地探讨了陨硫铁的形成机理。

For reasons in preliminary period, including productivity and problems in technique: a series of problems like skin turgescence caused by big noise, easily-broken needle, non-uniform coloring and slow rotation, people cannot help to doubt about the emerging product eyebrow tattoo machine, breaking the dream of those who yearn for achieve charming eyebrow by means of tattoo.

由于先期阶段的种种原因，包括生产力及技术上的问题：嗓声大、易断针、上色不均匀、转速慢而导致皮肤红肿等等一系列事情的发生，不禁让人们对于纹眉机这种新兴产品提出了质疑，也打破了渴望通过纹秀的方式来实现魅力之眉的那些人的梦想。

For reasons in preliminary period, including productivity and problems in technique: a series of problems like skin turgescence caused by big noise, easily-broken needle, non-uniform coloring and slow rotation, people cannot help to doubt about the emerging product eyebrow tattoo machine, breaking the dream of those who yearn for achieve charming eyebrow by means of tatto

由于先期阶段的种种原因，包括生产力及技术上的问题：嗓声大、易断针、上色不均匀、转速慢而导致皮肤红肿等等一系列事情的发生，不禁让人们对于纹眉机这种新兴产品提出了质疑，也打破了渴望通过纹秀的方式来实现魅力之眉的那些人的梦想。

The molecular weight of four kinds of UF resins by different process was determined by means of chemical analysis.

本文采用化学方法对四种工艺条件下合成的脲醛树脂进行相关分子含量测定，结合实验结果和合成工艺作了结构分析，并对比分析了衰减全反射红外光谱图。

Firstly, velocity expression of translational parallel manipulator was presented based on the screw theory. Secondly, the actuated screw, the actively unactuated screws and idle screws of each limb were determined according to the reciprocal screw theory. Then, all basic kinematic chains were enumerated by means of the number of limb connectivity and the limbs containing closed-loops were obtained by replacing the passive prismatic joints in the basic kinematic chains with planar closed-loop structures.

首先基于螺旋理论给出移动并联机构的速度表达式，然后根据互易螺旋理论确定出分支的主动螺旋、可动非主动螺旋和惰性螺旋，再依照分支连接度的不同列举出所有可行的基本分支运动链，并通过运动副替换得到分支中含有闭回路结构的运动链，最后利用所综合出的支链按照主动副的配置要求将动平台和静平台连接起来即可实现预期的机构。

A state variable feedback based system control approach, which indirectly controls load voltage by means of controlling the supply current, is proposed, thus the problem that the undamped DC transient component of supply current, which is caused by the linking inductance between power supply and power loads under PI control mode, is solved.

分析了仅由1套逆变器构成的并联型综合电能质量调节器的结构特点和控制目标，提出了一种基于状态变量反馈的系统控制方法，通过控制电源电流来间接控制负载电压，很好地解决了常规比例–积分控制时电源和负载间的连接电感所导致的供电电流直流暂态分量不衰减的问题。

By means of the undetermined coefficient method ,which is submitted in reference for solving nonlinear wave equations for their peaked soliton solutions ,three kinds of peaked soliton solutions are obtained for two important nonlinear wave equations— Korteweg-de Vries equation and Benjamin-Bona-Mahonyequation,respectively. One kind of peaked compacton solution ,which has the characteristics of both peaked soliton solution and compacton solution ,is obtained for above two equations with the aid of transformation relation between triangle function and hyperbolic function,. By use of above solutions, two kinds of periodic peaked traveling wave solutions are constructed.

摘 要：利用文献中提出的求非线性波方程尖峰孤子解的方法，分别求解了两个重要的非线性波方程—Korteweg-de Vries 方程和Benjamin-Bona-Mahony BBM）方程，得到了3类尖峰孤子解；借助双曲函数与三角函数间的变换关系得到了1类尖峰紧孤子解，该型解兼有尖峰孤子解和紧孤子解的特点；在上述结果的基础上构造了2个周期性的尖峰行波解。

On the other hand, with the purpose of fuzzy feature extraction and fuzzy classification device design, the undulatory property of maximum and minimum scattering power corresponding respectively to the maximum and minimum eigen-polarization has been investigated in frequency domain. Furthermore, the anisotropy polarization degree of target, which is determined by both maximum and minimum scattering power of target, has been studied; meanwhile, the dynamic changing characteristic of eigen-polarization on Poincare polarization sphere has been investigated by means of the conception of polarization frequency stability, the research result shows that PSD value has a big jump near π, forming a sharp pulse, and different target has their individual distribution property of PSD pulse.

另外，围绕目标模糊特征提取及模糊分类器的设计，研究了目标最大、最小本征极化所对应的目标最大、最小散射能量随观测频率的起伏特性，考察了由目标最大、最小散射能量共同决定的目标的各向异性极化程度；同时，采用极化频率稳定度的概念，研究了本征极化在Poincare极化球面上的动态变化特性，在最大、最小散射能量相等的频率点上，PSD曲线呈现为幅度接近π值的尖锐脉冲，反映了目标极化散射结构对这一频率跳变极为敏感，但不同目标的这种PSD曲线特征又有很大的不同。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷