查询词典 ray velocity

Furthermore, for angles of incidence other than 0o, Snell's law (that is, sin I /sin γ=constant) holds for the ordinary but not for the extraordinary ray, since the velocity of the latter is different in different directions.

此外，入射角如果大于零度，根据折射定律(sin I /sin γ=常量)适合于寻常光，但不适于非常光线，因而在不同的方向有不同的速度。

Based analysis above, we chose the spatial resolution of 1°×1°in the horizontal direction and 5~30 km in depth. Using the pseudobending method to calculate the ray traveling path and residual of travel time; LSQR method to inverse, we got the final 3-D P wave velocity structure in this area.

根据上述分析，以水平方向1°×1°，垂直方向以5 km、15 km、30 km为间隔划分网格，并建立初始速度模型，采用伪弯曲射线追踪方法计算走时和射线路径，通过基于LSQR算法的反演重建了研究区域40 km以下、480 km以上的三维P波速度结构。

This method involves forward modeling wavefield identification,interactive travel time pickup,minimum travel time ray tracing in the interface net,spline coefficient inversion instead of slowness inversion and final velocity field synthesising.

该方法利用正演模型识别波场，用交互法拾取走时，采用界面网最小走时射线追踪法进行射线追踪，并用反演样条系数代替反演慢度，最后合成速度场。

The invention discloses a vehicle speed matching method based on linear array CCD image, including the following steps that: two linear array CCD video cameras are respectively arranged on two sections positioned on a road at intervals; both linear array CCD video cameras face downwards and are provided with infrared ray laser source; the frame rate of each CCD video camera is more than 1,000 frames per second, and the resolution is more than 1,024 lines; correlation matching computation of the image sequences obtained by both linear array CCD video cameras is carried out to obtain the time difference of the same object in two image sequences; finally, by means of the time difference and the distance between both cameras, the driving speed of an object vehicle can be obtained according to the velocity formula V=s/t.

本发明公开了一种基于线阵CCD图像的车辆速度匹配方法，该方法在道路相距一定距离的两个断面上分别安装两个线阵CCD摄像机，两个线阵CCD摄像机指向垂直向下，线阵CCD摄像机上配有红外线激光源，线阵CCD摄像机的帧速率大于1000帧/秒，分辨率大于1024线；对两个线阵CCD摄像机得到的图像序列进行相关匹配计算，从而获得同一个目标在两个图像序列中的时间差，利用该时间差和两个摄像机的距离，根据速度公式V＝s/t即可以得到目标车辆的行进速度。

The velocity and planarity of the shock wave were measured. The radiation temperature measured by soft X-ray spectrometer was consistent with the result by optical streak camera.

通过冲击波法测得的腔内辐射温度与软X光能谱仪的测量结果一致，验证了冲击波速度测量的可信度。

Through many experiments, we find tracing without ray method can solve the problem. The method applies the refractional wave's geometric properties, and exports the velocity models.

无射线追踪法层析静校正将首波方法的稳定性和回转波方法的灵活性结合起来，隐式使用折射波的几何特性，并由此导出速度模型，达到不使用显式射线追踪法进行层析重建的目的。

Keywords salt dome;velocity field;subsalt structure;processing in time domain;ray

盐丘； 速度场；盐下构造；时间域处理；射线

Ray tracing: Determining the arrival time at detector locations by following raypaths which obey Snell's law through a model for which the velocity distribution is known.

射线追踪：通过追踪服从斯奈尔定律的射线穿过速度分布已知的模型，进而来测定其到达检波器位置所需的时间。

Refraction: The change of direction of a light ray or energy wave from a straight line as it passes obliquely from one medium to another in which its velocity is different.

折射：当光线或能量波倾斜着穿过一种媒介到另一种媒介时，由于光线在两种媒介中的传播速度不同，导致其传播方向发生偏转。

Methods:Paticipants consisted of 32 simple VSD patients and 27 simple PDA patients excluded of any other diseases by physical examintation and electrocardiogram and x-ray. Patients were suggested echocardiography before and one week after the surgerys. Parameters such as Left ventricular ejection fraction、Fractional shortening、Left ventricular end-diastolic dimension、Left ventricular end-systolic dimension、Heart rate and Aortal velocity peak were measured.further more ,the Tei index which is originated from Pulse-wave Doppler and Tissue-Doppler Imaging were also calculated under ECG monitoring.

研究对象与方法：研究对象分别为排除其它心脏疾患的单纯动脉导管未闭患儿及单纯室间隔缺损患儿，手术治疗前后于心电监护下先行常规超声检查，获取心率、R-R间期、左室射血分数、主动脉峰值流速、左室收缩末期内径及左室舒张末期内径等值，并分别利用频谱多谱勒及组织多谱勒法测取患儿左室Tei指数(即PW-Tei及TDI-Tei)，多次测量并取其均值。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。