查询词典 refraction angle

The parabolic equation can treat large angle incident waves and includes the wave energy loss with Bretchneider—Reid formula which has been verified by lots of indoor and field data, Its numerical model can simulate wave shoaling、refraction、small angle diffraction and bottom friction, and can be aplied to study the wave filed from open sea to shore area.

在抛物型缓坡方程波浪数学模型的建立过程中，采用适用于较大角度传播的基本方程，同时这一模型引入建立在较多实验和实测资料基础上的Bretchnei-der—Reid公式，较好地考虑了底摩损耗问题。该模型可同时考虑波浪的浅水变形、折射和小角度绕射，适用于大范围波浪场的推算。

Utilizing this mathematics model, we discuss the varying tendency of minimum reflectance and resonance angle under the linear and nonlinear condition. In addition, we discuss the changes of the minimum reflectance, resonance angle, nonlinear refraction index and nonlinear absorption index verse light intensity.

利用该数学模型，讨论了线性和非线性情况下，最小反射系数和共振角的变化趋势，此外，我们还讨论了最小反射系数、共振角和折射率实部和虚部随着光强的变化。

Optimal screw path length: The distance from the optimal entrancepoint to the optimal vent point Screw tail distance: The distance between left and right optimalentrance point Transverse section angle: Half of the included angle between left andright optimal screw Sagital section angle: The average of angle between both side optimalscrew with the upper terminal plate 1.2.2 Modify the threshold of CT value to distinguish the rear partof the lumbar, Observate the the optimal entrance point and the adjustable range.

1.2.2三维重建观察螺钉最佳进钉点的位置和各方向螺钉进钉点关系，调整CT值下限阈值使椎弓后部结构尽量显示清晰，以利观察。 1.3统计方法本实验采用SPSS13.0统计软件。对同一椎体左右两侧椎弓根螺钉相对数据行计量资料配对样本t检验，对男女组间相关数据行计量资料独立样本t检验，对男女组内不同腰椎节段间相关数据行单向方差分析及不同腰椎节段间LSD法多重比较。

Based on varying process of generator terminal parameters after excitation fault, shortages of excitation protective principle of static stability boundary and asynchronous impedance boundary are analyzed. It proposed that excitation fault research relates to large-disturbance stability. Because dynamic power-angle character of generator after excitation fault is non-sinusoidal, there are differences between dynamic power-angle character and static state power-angle character. So it isn't ideal to protective operation result based on small-disturbance stability and static stability boundary criterion. At the same time, it proposed that asynchronous boundary impedance criterion is a constant reactive power circle moving adown j Xd′. It can ensure complete loss-of-excitation generator measuring impedance enter into the circle, but can't ensure the other condition measuring impedance including impossible losing synchronism enter. So loss-of-excitation protection would be maloperation when system voltage drops short and recovers or generator rejects load.③Based on stability principle, it puts forward setting conditions and calculation method of generator loss-of-excitation protection by direct measuring power-angle.

以励磁故障后发电机端的相关参数的变化为基础，通过对以静稳定边界和异步阻抗边界作判据的两类三种现行励磁保护在原理上存在的缺陷分析，发现：励磁故障是一个大干扰稳定性问题，励磁故障后的发电机的动态功角特性与静态功角特性有很大的差异，已远非正弦曲线，因此基于小干扰稳定性原理、以静稳定边界作判据的保护必然动作不理想；异步边界阻抗判据是一个下移j Xd′的等无功阻抗圆，它可以保证完全失磁后的发电机测量阻抗能进入该阻抗圆，但不能保证完全失磁之外的其它状态不会进入该阻抗圆，因此在系统电压短时下降或发电机突然甩负荷等情况下可能启动该保护使之误动。

In this paper, a spark advance angle adjusting system is presented. In the system, spark advance angle of engine with carburetor on which spark controlled ECU is installed can be matched, the spark advance angle was real time adjusted according to engine different speed and load to find the ideal spark advance angle.

提出了一种具有调节点火提前角功能的控制系统，该系统能够在对化油器发动机进行简单改造加装点火控制ECU后对其点火提前角进行标定，对发动机在不同转速和工况下的点火提前角进行实时的调节，寻找到发动机在该转速和工况下的理想点火提前角。

Results There were obvious mandible changes such as the increase of SNB angle and decrease of ANB angle and overjet after treatment with Twinblock, suggestive of mandible growth, increase of facial angle, reduction of mandible process angle, mild adduction of upper incisors, and mild anteversion of lower incisors.

结果 矫治前后下颌骨的变化具有统计学意义，表现在SNB角的增大和ANB角、OJ的减小，提示下颌骨的生长、面角增加和颌突角减小，上前牙轻度内收和下前牙少量前倾。

［Objective］To identify the standard of radiographic diagnosis and analyse the measurement between tailor's bunion and normal feet.［Methods］The fourth-fifth intermetatarsal angle (IM4～5),modified fourth-fifth intermetatarsal angle (MIM4～5),metatarsophalangeal-fifth angle,lateral deviation of the fifth metatarsal angle,width of fifth metatarsal head,distance of prominence of the fifth metatarsal head were measured by X-ray for 131 feet of normal persons and 117 feet of tailor's bunion. The measured results and other clinical presentations were compared.

［目的］通过对小趾囊炎足与正常足X线的测量及对比分析研究，明确小趾囊炎足X线诊断标准［方法］对131例正常足与117例小趾囊炎足的第4～5跖骨间角(IM4～5)，改良4～5跖骨间角(MIM4～5)，小趾内翻角，第5跖骨外翻角，第5跖骨头宽度及突出距离进行X线测量，结合临床对测量结果进行对比分析研究。

Methods］The fourth-fifth intermetatarsal angle (IM4～5),modified fourth-fifth intermetatarsal angle (MIM4～5),metatarsophalangeal-fifth angle,lateral deviation of the fifth metatarsal angle,width of fifth metatarsal head,distance of prominence of the fifth metatarsal head were measured by X-ray for 131 feet of normal persons and 117 feet of tailor's bunion.

方法］对131例正常足与117例小趾囊炎足的第4～5跖骨间角(IM4～5)，改良4～5跖骨间角(MIM4～5)，小趾内翻角，第5跖骨外翻角，第5跖骨头宽度及突出距离进行X线测量，结合临床对测量结果进行对比分析研究。

A new image registration algorithm is presented based on contour-feature, which involves extracting the contour of the image, calculating the normal angle of each contour point and proceeding normal angle histogram statistics, then estimating quickly the rotation angle between two images by circular correlation of normal angle histograms.

提出了一种新的基于轮廓特征的图像配准算法，首先提取图像轮廓并计算每个轮廓点的法向角，然后对轮廓点法向角进行直方图统计，通过对两幅图像的轮廓点法向角直方图进行圆周相关计算便可快速估计出两幅图像所存在的旋转角度。

Results the safe angle range for needling yamen (gv 15) were: 16.27±7.68～29.46±7.23 degrees for males and 18.46±4.81—33.61±7.83 degrees for females; the danger angle of upward oblique insertion was negatively correlated with the extension of bowing and raising the head, that is, the larger the angle of backward raising the head, the smaller the range of danger angle of needling into the great occipited foramen.

结果：得出哑门穴安全针刺角度，男性为16.27±7.68～29.46±7.32度，女性18.46±4.81～33.61±7.83度。且向上斜刺的危险角度范围与头颅俯仰程度呈负相关，即头颅后仰角度越大，刺入枕骨大孔的危险角度范围越小。

Finally it offers the analysis of the fault-tolerance system as well as its test verification.

这样，运行于空间环境中的系统的设计目标就是在保证系统实时性

However, it is still difficult to find out the real reason of the increase of the keratinized gingiva during the orthodontic extrusion whether it is due to the proliferation of the gingival tissue or to its elastic nature, that is because the proliferation of the fibroblasts as well as the connective tissue changes in volume and the intra-fibers spaces were all immeasurable in most of the studies.

然而，仍然难以找到真正的原因增加的角化牙龈在正畸挤压它是否是由于扩散的牙龈组织或其弹性性质，这是因为增殖的成纤维细胞以及作为结缔组织的变化量和内部纤维空格都是不可估量的，大多数的研究。