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Firstly the dimensionless planar motion model of SGKW was established;then the optimal control problem of shortest time coplanar hit orbit was transformed into two-point boundary value problem by means of Pontryagin maximum principle .

首先建立了SGKW的无量纲化平面运动模型，然后利用庞特里亚金极大值原理将时间最短共面打击轨道的最优控制问题转化为两点边值问题。

According to the requirement of a minimum-fuel-consumption, a method of coplanar hit orbit optimization design for SGKW was studied. The dimensionless planar motion model of SGKW was founded, and the optimal control problem of minimum-fuel-consumption coplanar hit orbit was derived into two-point-boundary-value problem according to Pontryagin maximum principle.

针对燃料最省要求，研究了SGKW共面打击轨道优化设计方法，建立了SGKW的无量纲化平面运动模型，利用庞特里亚金极大值原理将燃料最省共面打击轨道的最优控制问题转化为两点边值问题。

A unique 946 nm and 473 nm single-frequency non-planar ring cavity constituted of a thermally bonded Porro prism and a corner cube is proposed .

提出并实现了由热键合直角棱镜与角锥棱镜构成的新型946 nm及473 nm单频非平面环形激光器。

The characterization of planar waveguides fabricated in X-cut LiNbO_3 by proton exchange and the post annealing is studied.

质子交换技术是制作高折射率、低损耗、具有偏振特征的LiNbO3光波导器件的非常成熟的方法[1]。

About the title of statistic of planar vector, probability, its solve problem process to permeating function form not only, and still permeating function thought; again criterion the tool that derivative is research function, had derivative, function content more appear profundity, rich and colorful.

有关平面向量、概率统计的题目，其解题过程不仅渗透着函数形式，而且还渗透着函数思想；再则导数是探究函数的工具，有了导数，函数内容就更显得深刻、丰富多彩。

A group of projective invariants is proposed for recognition of planar polygons.

4给出一组用于识别平面多边形的射影不变量。

Based on the cross-ratio of five coplanar points, a group of projective invariants is derived for recognition planar polygons.

论文利用具有射影不变性的共面五点交比，导出一组用于识别平面多边形的射影不变量，并给出了相应的识别算法。

On the assumption that a triplet of points is matched to another one as a whole beforehand, we give an effective algorithm based on P〓-invariants. On the assumption that there exists an arbitrary closed curve in the scene plane, using a technique named projectively invariant decomposition of planar shapes, we realize another efficient algorithm.

在假设已知一对三点组整体对应的前提下，基于对排序和投影同时保持不变的P〓-不变量，给出了一种有效算法；在假设场景点集所在平面内存在一条封闭曲线的前提下，利用平面形状射影不变分解技术，提出了另一种有效算法。

Materials and Methods: The normal pterygopalatine fossa and its communication of 100 cases (200 sides) were studied, moreover pathological changes were observed in 23 cases (41 sides) of fibrous dysplasia by MSCT scanner, all volume data were subjected to multiplanar reformation, curved planar reformation in working station, to review the morphologic characteristics of the normal pterygopalatine fossa and its communications, to measure and compare the pterygopalatine fossa, pterygoid canal, foramen rotundum between two sets respectively.

资料与方法：对100例（200侧）正常翼腭窝及其通道及23例（41侧）累及翼腭窝及其通道骨纤维异常增殖症患者进行MSCT扫描后，将以上两组所有数据传至工作站进行后处理重建，主要包括MPR、CPR，观察正常翼腭窝及其通道形态特征，并对两组翼腭窝、翼管、圆孔的有关径线进行测量、比较。

According to the method for force analysis of statically indeterminate structure and that of common planar mechanisms, the structural deformation coordination equations, which are based on the microdisplacement of movable pushrod, are put forward.

建立偏心轮推杆行星传动的有限元分析模型，用有限元软件全面分析了传动中各啮合零件的变形和啮合刚度，得到了各个零件啮合刚度的变化规律。

The X-ray diffract was used to analyze the crystal structure of the composite. Results show that after the talc was treated with blend coupling agent, the crystal structure of talc changed, and effect Intercalation phenomenon.

通过X射线衍射分析可知，用混合偶联剂对滑石粉进行预处理后，滑石粉晶体结构发生改变，产生了插层现象，使PP／滑石粉复合材料为纳米复合材料。

An authentic Maui wedding might require the services of a 'kahu', which is a Hawaiian minister.

毛伊可能需要一个真实婚礼服务'kahu'，这是夏威夷部长。