矢

The vactrix method is further developed, a vectrix Skew-symmetric crossproduct identity is presented and the dyadic form of the derivative of a vector with respect to another vector in terms of vectrix is also offered.

进一步发展了矢阵方法，提出了矢阵叉积算子恒等式及矢量相对于矢量的导数以矢阵表示的并矢形式，并给出了若干应用实例。

And aimed to the changes of conformance between the normal vector and compensated direction, we put forward a method named fixed normal vector based on the process of on-the-spot survey.

然后，针对补偿公式中法矢与外法矢一致性存在变化的情况，根据三坐标测量机的实际测量过程，提出了一种"法矢固定法"，简化了补偿公式。

Results: Anterior talofibular ligament on axial plane, calcaneo fibular ligament on coronal and oblique axial planes, posterior talofibular ligament on all of four planes, cervical ligament on coronal and sagittal planes, interosseous talocalcaneal ligament on coronal, sagittal and oblique axial planes, lateral bundle of inferior extensor retinaculum on coronal and sagittal planes, medial and intermediate bundle on coronal planes, can be most clearly observed.

结果：距腓前韧带在轴位，跟腓韧带在冠状位和斜轴位，距腓后韧带在四个方位，颈韧带在冠状位和矢状位，距跟骨间韧带在冠状位、矢状位和斜轴位，伸肌下支持带浅束在冠状位和矢状位，中束和深束在冠状位，能清楚观察各韧带的形态和毗邻关系。

Methods:Fifty paired embalmed cadaveric humeri (twenty-five pairs:fourteen from male donors and eleven from female donors) were scanned in medial-lateral and anterior-posterior position according to the humeral retroversion by CT. Images of the humeri in the transverse planes at the lowest border of neck,20mm and 40mm distal of LBN(LBN-20、LBN-40), isthmus, head-neck anterior-posteriorwere obtained. Sixty-one extracortical and intracortical parameters were measured exactly by image analytic computer software that included offset, head position, head-shaft angle, head to tuberosity height, head thickness, curvature radius, articular surface arc, neck diameter, isthmus position, proximal and distal border of isthmus, maximum coronal and sagittal diameter of medullary canal and thickness of cortical bone in four planes, including LBN, LBN-20,LBN-40 and isthmus.

50根成对防腐肱骨(男14对，女11对)按肱骨头扭转角置于冠状位和矢状位，行肱骨全长，头颈矢状面，解剖颈下缘及其下20mm、40mm，髓腔狭窄部四平面CT扫描，由CT软件测量冠、矢状位髓腔内外参数共61项，包括头心—干轴距，头位置，头干角，头—结节高度差，头厚度，头半径，关节面张角，解剖颈直径，髓腔狭窄部位置，解剖颈下缘及其下20mm、40mm和狭窄部四个平面髓腔的最大冠、矢状径，皮质骨厚度等。

In the algorithm, tangent plane of the surface at each point is first calculated according to the point and its neighbor points. In an optimized sequence, normal vectors of the tangent planes are oriented to the outside of the surface. Finally, marching cube method is used to output the triangular representation of the surface.

该算法首先根据测点的邻近测点估算曲面在该测点处的法矢，并采用优化的顺序对法矢方向进行调整以使各测点处的法矢都指向曲面外侧，最后用步进立方体算法输出三角网格模型。

Results: Most of ligaments of the occipito-atlanto-axial joints can be identified on sagittal planes, however, the transverse atlantal ligament on axial plane, the alar ligament on oblique coronal and axial plane, can be clearly demonstrated.

结果：寰椎横韧带在横断位和矢状位，翼状韧带在斜冠状位和矢状位，齿突尖韧带在矢状位和斜冠状位能清楚观察各韧带的形态和毗邻关系。

Results: Anterior to the coronal suture and posterior to the lambdoid suture were two segments of SSS void of bridging vein draining into. The number of bridging veins observed by microanatomy, DSA and CTV was 11.2, 8.9 and 7.0 respectively.

结果：上矢状窦前部和后部分别有一缺乏桥静脉注入段，显微解剖、DSA和CTV观察上矢状窦旁桥静脉的数量分别为11.2支、8.9支和7.0支，DSA和CTV观察发现桥静脉注入上矢状窦处常显示不清。

It is standard practice that all Prometheus' are armed with a pintle-mounted storm bolter, for anti-infantry defence, acting as a stand-in for the hull mounted heavy bolters, which are removed to make space for the extra communications equipment.

对于所有装备两侧暴风爆矢枪的普罗米修斯们有一个标准条例，它规定暴风爆矢枪是用于取代为了给额外通信系统腾出空间而被拆除的顶置重型爆矢枪，并且执行和它一样的反步兵任务。

The internal forces of the main arch springers are calculated in different rise-span ratios of top and bottom arch ribs. The internal forces of arch ribs and deformations of main spans are calculated in 1/5, 1/4 rise-span ratios of top and bottom stacked arch ribs and in 1/5 rise-span ratio of dumb-bell arch ribs.

给出上、下拱肋为不同矢跨比情况下的主拱拱脚截面内力，当叠合拱桥的上、下拱肋矢跨比分别采用1/5、1/4与矢跨比为1/5的哑铃拱拱肋的内力和主梁及拱顶变形计算结果。

For the dyadic Green's function, we have the constituent method, source dyadic method and the quasi source dyadic method.

对于并矢格林函数奇异性问题处理方法有：分量处理法、源并矢法和拟源并矢法等处理方法。

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。