penumbra是什么意思

网络释义

用法例句

Genetic algorithm is utilized to optimize the leaf end shape to improve the size and uniformity of leaf-end penumbra.

使用遗传算法对叶片端面形状进行了优化设计,使端面产生的半影大小和一致性得以改善。

Firstly,we generated two depth buffers for occluder and receiver,discretizing the occluder to micro-patches;then,we calculated the depth value of shadow for each micro-patch and estimated the visibilities of them;finally,we computed penumbra extent for each micro-patch and projected soft shadow map on the scene to obtain real-time soft shadows.

首先为场景中遮挡物、接收面计算深度缓存,并离散遮挡物成许多微面;接着计算每个微面的阴影深度值,估计微面的可见度;最后计算微面半影范围,将软阴影图投影回场景中,得到实时软阴影。

According to the requirements of precision conformal dose delivery, the side focused and tongue-groove structure of multi-leaf collimator is determined, and genetic algorithm is utilized to optimize the leaf end shape, which results in the improvement of penumbra size and uniformity.

根据剂量精确适形的要求,确定了多叶组合光栅侧面的聚焦和榫槽结构,使用遗传算法对叶片端面形状进行了优化设计,使端面产生的半影大小和一致性得以改善。

The items discuss imaging, umbra and penumbra, reflection of ray, and so on.

本文选择了《墨经》中四条光学经文 ,详细进行了研究 ,这四条经文是关于几何光学中的物体在平行光下成像、两个光源照物时产生的本影与半影、光线的反射、光源与物体的大小及距离和成像大小的关系等。

Estimation of radius of influence of pumping landfill gas;

垃圾填埋气体抽排影响半径的预测

The result shows that with the same AS pressure and airflow rate,the greater the AS well depth,the greater the radius of influence(ROI),but the air distribution concen.

实验结果表明:在相同曝气压力和流量下,曝气深度越大,影响半径越大,但影响区内的气流分布越稀疏;相反,曝气深度越小,则曝气影响半径越小,但在影响区内空气流线分布越密。

Related parameters in rechecking formula to the dewatering of foundation pit have been discussed,the selection of related parameter should consider the radius of influence of pumping we.

干扰群井基坑降水设计中,对基坑内水位降深的复核是关键的一步,它关系到降水井布置的合理性、影响到降水井的数量及基坑降水的成败,该文针对基坑内地下水位复核公式中相关参数的选取进行了分析,探讨了具体参数取值的合理性问题,认为相关参数的选取应该考虑到抽水井的影响半径,公式中的基坑涌水量应该为抽水井影响半径范围内所有抽水井的出水量,分析了参数的使用条件,并结合实际情况提出了改进建议,新参数的取值方法更符合实际情况。

In this article,authors verify theoretically the rationality of an incomplete penetration well,optimize and analysis two key parameters of gushing water amount calculation,influence radius and penetration coefficients,and provide a calculation method.

从理论上论证了非完整井的合理性 ,对涌水量计算的 2个关键参数———影响半径和渗透系数进行设计优化分析 ,给出计算方

The generalized large well method is not applicable when the influence radius doesn t exit and the complicated hydrogeological condition is not fit to the condition of Dupuit well-flow formula.

但是当水文地质条件复杂,不能引用影响半径时,就不符合裘布依井流公式的适用条件,也就不能再用大井法计算排水量;同时,对于施工复杂的特大型深基坑工程,仅简单地进行均匀布井或非均匀布井,不能预测降水的非稳定过程,且并不一定能保证降水的效果。

The main parameters of well points selection and emerging volume, including infiltrate coefficient, precipitation depth, influence radius, velocity of flow etc are analyzed in this paper.

本文对降水井点选择和涌水量计算的关键参数如 :土质渗透系数、降水深度、抽水影响半径等进行了讨论 ,分析了井点设计中需注意的问

To Solve the Yield and Influnce Radius of Seepage Well on the River Bed by Hydraulic Flow Net Method

用流网法求解河床渗井的出水量与影响半径

Study on the Neighborhood Influence Radius of Partial Main Tree Species in Northeastern China.;

东北东部山区部分主要树种邻体影响半径研究

Experimental Investigation on Pressure Falling Method Measuring the Borehole's Influence Radius

压降法测定钻孔的抽放影响半径试验研究

The Study on the Temperature and Humidity Effective Radius and the Space-time Variational Laws of DaQing Longfeng Everglade

大庆市龙凤湿地对城区温、湿度影响半径及时空变化研究

Analysis of the Influence of Initial Radius on Expansion of Cylindrical Cavities

初始半径对柱孔扩张问题的影响分析

Discussion on the effect of curve radius on curve girder bridge design

浅析曲线半径对曲线梁桥设计的影响

Analysis of radius and depth of shield tunnel on its seismic response

盾构隧道半径及埋深对其地震响应的影响分析

Influence of Liner Curvature Radius on Parameters of Explosively Formed Penetrator (EFP)

药型罩曲率半径对爆炸成型弹丸参数的影响

The effects of tool nose curvature radus on the accuracy in numerical control lathe;

数控车中刀尖圆弧半径对车削精度的影响

Study on the influence law of the rolling curve affected by rolling radius during cam shaft cross wedge rolling

楔横轧凸轮轴轧制半径对辊形曲线影响的规律

Research on Left-turning Saturation Flow with Different Lane Widths and Turning Radiuses

车道宽度、转弯半径对左转饱和流量的影响研究

Analysis on Influencing Factors of Gas Emission with Boreholes to Determine Drainage Radius

钻孔瓦斯涌出量确定排放半径影响因素分析

Effect of curve radius and axle load on friction of wheel/rail

曲线半径及轴重对轮轨摩擦功影响的研究

Finite Element Simulation of Influence of Tool Edge Radius in Micro-milling

微铣削加工刀具刃口半径影响的有限元模拟

Application of element-free Galerkin method in consideration of self-adaptive radius of influential domain

一种自适应影响域半径无网格Galerkin法的应用研究

Research the reason of influence the mediμm radius horizontal well drilling speed in the shallow layer

影响浅层中半径水平井钻井速度的原因探讨

Effect of Curve Radius on Rolling Contact Fatigue Properties of Rails

曲率半径对钢轨滚动接触疲劳性能的影响

Evaluation of respiratory influence on interventricular septum by radius of curvature

曲率半径法研究呼吸对室间隔运动的影响