查询词典 solid angle

This paper studies the main geometrical parameter such as angle, height, width, stagger and the upper width in dentation and trapezoid flow path, firstly, uses the single-phase numerical simulation of the computational fluid dynamics technique to analyse the influence of different geometrical parameter on discharge coefficient and flow state exponent of drip emitter. Secondly, uses the two-phases numerical simulation of CFD (1% sand content ) to analyse the influence of the above mentioned geometrical parameter on the contribution regulation of sand and anti-clogging performance. Thirdly, uses the PIV （ particle Tracking Velocimetry ） technique which can see the small-scale flow path to observe and test the trajectories and velocities of solid particles in labyrinth flow path, and analyses the basic factors which can influence the movement characteristic of solid particles and the flow state in flow path.

本文以齿形流道、梯形流道为主要研究对象，以流道转角、流道高，流道宽、偏差量及梯形流道上底宽为主要结构参数，首先应用 CFD 单相流数值模拟技术对不同结构参数灌水器流道水力性能进行模拟，分析了不同结构参数对流态指数和流量系数的影响，其次，应用 CFD 两相流（含沙量为1%）数值模拟技术分析了结构参数对含沙量分布规律和抗堵塞性能的影响，然后，应用 PIV 可视化测试方法测试了固体颗粒在流道内运行轨迹及速度，分析了影响固体颗粒运动特性及流道内流体流态的基本因素，最后，对上述流道结构形式通过模具加工及滴灌带试制，进行了标准化测试（ GB/T 17187-1997 农业灌溉设备滴头技术规范和试验方法与 ISO 标准 ISO /TC23 /SC18 /WG5N4短周期堵塞测试程序），测试结果验证了 CFD 模拟结果，并提出了迷宫结构流道灌水器的抗堵塞设计方法。

Hence, based on acoustic potential function and boundary condition on solid interface, we get reflection coefficient and refraction coefficient of longitudinal wave and transverse wave on solid-solid interface, and provide approximate formula of the reflection coefficient and the refraction coefficient about the first critical angle of incidence. We analyze relation between the refraction coefficient and acoustic impedance.

为此，基于固体介质的声势函数和界面的边界条件，推导了固-固界面纵横波的反射系数和透射系数，以及第一临界角入射情况下反射系数和透射系数的近似公式，并且分析了透射系数与声阻抗之间的关系。

The calculation methods are presented for the reflection and transmission of ultrasonic waves incident from the fluid on to the arbitrary orientation interface of the general anisotropic solid. It is found that the reflection and transmission coefficients depend on, in general, the elastic parameters of the media, orientation of anisotropic solid surface and incident angle.

考虑到由流体斜入射到各向异性固体时超声波模式转换的一般情况，给出了超声在流体和各向异性固体任意取向界面上反射和折射问题的求解方法；超声反射和折射系数是媒质弹性参数、界面取向及入射角的函数。

In this work, a single Fe atom and multi Fe atoms as model respectively, holograms recorded in a complete 4π solid angle with different range and magnitude of incident energies are calculated.

分别以单个和多个铁原子为模型，数值模拟了它们在4π立体角范围内、不同范围的入射能量的情况下记录的全息图。

In this paper,a method to determine the fractal dimension of pore-solid interface in porous solid materials by the small angle X-ray scattering is introduced.This method is also used to determine the fractal structure of fly ash-cement pastes.

简要介绍了用X 射线小角散射分析技术测定多孔固体材料中气孔固体界面分形维数的理论，并将这一理论用于测定粉煤灰水泥浆体的分形结构。

A 13. 4nm conversion efficiency of 0.75% into 2% bandwidth and 2π steradian emission solid angle is achieved at 0.5mm laser-nozzle distance.

在实验上，建成了一套高光谱分辨率和高灵敏度的软X射线脉冲辐射测量装置。

A unit luminous flux equal to the amount given out through a solid angle 1 steradian by a 1 candela intensity radiating uniformly in all directions .

光通量单位等于一国际烛光照射在距离为一厘米面积为一平方厘米平面上光通量。

A unit luminous flux equal to the amount given out through a solid angle 1 steradian by a point 1 candela radiating uniformly in all directions .

光通量单位等于一国际烛光照射在距离为一厘米面积为一平方厘米平面上光通量。

Based on the Mie scattering theory, a formula to calculate the scattered light flux in a certain solid angle under the condition of polarized light input is derived form the formula for calculating scattered light intensity. The results are compared with the condition illuminated by a unpolarized light.

在Mie散射理论基础上，由单分散射的光强表达式导出在偏振光的入射条件下一定立体角内的散射光通量的表达式，并与自然光入射作比较。

Transmitted electrons were finally detected by a channeltron electron multiplier operating in single-pulse mode instead of usual measuring current intensity, which can reduce the acceptance solid angle and the contribution of elastic scattering in the forward direction can be minimized effectively.

因采用了恒温控制作用室，以便较准确测量反应室的绝对气压值；同时采用静电型圆柱能量分析器，并用计数率测量模式代替通常的束流强度测量模式，从而可以大幅度减小接收立体角，抑制零度角的弹性散射贡献。

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。