焦散线

The rays go through a series of convolutions called the conoid of Sturm.Midway between the two focal lines , the rays form a circlecalled the circle of least confusion.

7光线经过一系列的聚散形成 Sturm 光锥，在两条焦线之间，光线形成一个圆斑，称为最小弥散圆。

The main contents include the ray phenomenon and its generation conditions; the deduction and physical illumination of wave action conservation equation and wave number conservation equation; ray theory for sinusoidal waves; Fermat's principle; the variation of amplitude in the case of straight and parallel depth contours and circular depth contours; the amplitude near the caustics; wave trapping; deduction of mild-slope equation and the relevant numerical solution methods.

讲授折射现象及其发生的条件；波作用守恒方程和波数守恒方程的推导及物理解释；稳恒正弦波的控制方程及射线方程；费马原理；利用射线方程研究等深线是平行直线和圆周线时波振幅的变化，特别是焦散线附近波高的变化以及由此而产生的波的俘获；缓坡方程的推导及有关的数值求解方法。

The experiment was performed at the Asterix IV iodine laser with a prepulse 5 ns before the main pulse. Under optimum focusing conditions for main pulse and prepulse the X-ray laser beam splits into two beamlets along the target surface at its output end of the 2.5 cm long plasma column. The splitting was still observed when the prepulse alone was defocused.

实验发现在抽运激光主、预脉冲最佳聚焦条件下， X射线激光束在2.5 cm长的线状等离子体输出端沿靶面方向分裂成两束；在抽运预脉冲单独散焦条件下，仍然观察到这一分裂现象；但是当抽运主、预脉冲同时散焦时，这一分裂现象逐渐消失并获得了半宽度只有40 μm的非常窄的近场像。

Clearly visible are intricate layers and glowing caustics of an ever changing mixture of hot gas and magnetic fields.

不断变化的混合热气和磁场的错综复杂的层次和光亮焦散线清晰可见。

Some features like caustics, filters, depth of field, etc.

一些功能如焦散线、过滤器、域深等等，已被实现。

The experimental results indicate that the reflected dynamic caustics method is available for the dynamic fracture experimental studies of polymer composites and can provide guidance in ameliorating designs of polymer blends.

实验结果表明，动态焦散线方法为高聚物复合材料的动态断裂实验研究提供了一种可行的方法，并可为高聚物复合材料性能的改进提供依据。

In a caustics experimental system, high-quality whole-field caustics images are digitally recorded.

在数字焦散线实验系统中进行实验，获得了清晰的全场焦散线数字图象。

In this article, the caustics method and holo-photoelasticity method are used to investigate the distribution of contact forces inside a pack of discrete square cells submitted to a compressive load.

本文运用焦散线法和激光全息光弹法对受集中荷载作用的颗粒堆中力的分布进行了较为详细的实验研究，通过对实验数据的定量分析得知：与传统连续介质弹性理论所揭示的规律不同，堆积体内部力的传递与分布遵循抛物线型方程。

Using the transparent material PMMA, a model experiment was carried out by the transmitted dynamic caustics to obtain a series of dynamic caustic photos.

应用爆炸加载的透射式动焦散线测试系统，分析了有机玻璃切槽孔爆破模型的裂纹动态特征变化规律。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。