方位

We extend the second order elastic tensor of Husdon's and turn it to a matrix which makes the calculation of second order perturbation much more concise. Then the azimuthally phase and group velocity formulas of plane wave propagation in horizontal plane are deduced according to Christoffel equation, and the azimuthally dependent velocities in dry and water saturated cracked medium are calculated.

而后，根据Christoffel方程推导了由各向同性背景介质中含两组非正交的垂直裂隙而形成的等效单斜各向异性介质中，在水平面内随方位变化的相速度和群速度的计算公式，并对干裂隙和饱和流体填充裂隙介质两种具体情况进行了计算。

The study has also shown that there is a rotation angle for azimuthally NMO velocity ellipses in monoclinic media which different form HTI and orthorhombic media. The rotation angles of NMO ellipses are related to the property of fracture infill, fracture density ratio and the angle between the two fractures.

同时，研究表明对于裂隙型单斜各向异性介质，其方位NMO速度椭圆轴向并不象HTI介质和正交介质中的那样与自然坐标系的坐标轴一致，而是发生了一定角度的偏离，其大小与裂隙填充物的性质、两组裂隙密度的比值及裂隙间的夹角等因素有关，研究结果为进一步区分裂隙介质的类型及裂隙填充物的性质提供依据。

However, fetal position and fetal head deformation biparietal diameter may affect the accuracy.

但胎方位及胎儿头变形均可影响双顶径的准确度。

Results When the foot was in a relaxing position, the optimal position to observe anterior talofibular ligament with MRI was transverse orientation, to calcaneofibular ligament was transverse oblique, to posterior talofibular ligament and cervical ligament was coronal and to interosseous talocalcaneal ligament was sagittal orientation. The identifying signs of the ligaments were described.

结果 当足呈自然放松位时，距腓前韧带在横断位，跟腓韧带在斜横断位，距腓后韧带在冠状位，颈韧带在冠状位，距跟骨间韧带在矢状位断面上，为最佳观测方位，并提出了各韧带在断面上的辨认标志。

The needle cannular includes a fixed angle of orientation relative to the plane of the skin engaging surface.

针管包括与皮肤接触表面的平面相关的方位定角。

When we arrived, we would scan the dogs and tell one another who was there. Caspar, Nugget, Yank, Priscilla.

我们到达那里时，会先看一下有哪些狗，互相转告各狗在哪个方位：卡帕斯巴，纳格特，杨克，普丽西拉。。

The result shows that urban landuse growth in Wuxi City has distinct phase character since 1978, which reflects the course of urban development and maturily. Owing to the diversity of local nature, traffic, society and economy condition and the leading of policy, spatial distribution of urban construction landuse growth in Wuxi City has distinct diversity and strong centripetalism. The central city landuse growth has distinct leading direction at different period of time. And the central city has so strong attraction and radiation force to the market towns that dominate the direction of landuse growth of the market towns scattered around a certain distance.

研究表明：改革开放以来，无锡市城镇建设用地扩展具有显著的阶段性，用地扩展模式反映了城市发育、成长乃至成熟的历程；自然交通、社会经济条件的差异以及政策的引导，无锡市城镇建设用地扩展的空间方位差异显著，具有较强的向心性，主城区不同时段扩展的主导方向明显，对其周围集镇具有强大的吸引力和辐射力，它主宰着周围一定范围内集镇用地发展方向。

In light of Fresnel formula the author analyses the features of linearly polarized light reflecting on the surface of apparent medium,discusses the relationship between the circumrotation in the plane of vibration,changes of the light intensity and the angle of incidence,the orientation of the plane of vibration,and addresses the relationship between the swing,phase and the incident angle and medium.

自然光在分界面上反射的一些特点在许多光学教材[1，2]上都进行了介绍，本文根据菲涅耳公式和菲涅耳定律，分析线偏振光在透明介质分界面上反射时的一些特点，讨论反射光的振动面所发生的旋转及光强度的变化与入射角、振动面的方位之间的关系；进一步讨论在全反射情况下，反射光的振

Conventional electrophysiological technique was used to determine the corticofugal modulation of the directional sensitivity of mouse inferior colliculus.

应用常规电生理学技术，研究小鼠听皮层对中脑下丘神经元方位敏感性的下行调制。

Decentration had no change with time. There was no statistical significant difference between PRK and LASIK.

两组 术后偏中心距离及方位不随时问推移而改变，与PRK和LASIK 的手术方式无关。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。