以下为句子列表:
英文: A simply and analytical formula of the axial light intensity distribution behind a circular aperture is derived by using the Helmhotz-Kirchhoff integral theorem and the Kirchhoff's boundary conditions.It is studied the nonparaxial on-axis intensity distri
中文: 用亥姆霍兹-基尔霍夫积分定理和基尔霍夫边界条件,推导出了平面波经小圆孔非傍轴衍射时轴上强度的简单解析表达式,研究了平面波经小圆孔后整个衍射空间非傍轴的轴上光强分布.给出了计算圆孔菲涅尔数的精确公式,重新检查了通常的菲涅尔数公式的有效性.数值计算显示,应用解析表达式所得的结果与应用衍射积分公式所得的结果完全一致.
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英文: In this paper, on the base of paraxial approximations, we present a set of absorbing boundary conditions of 3D elastic wave equations and apply to the 3D elastic wave numerical modeling in isotropic medium.
中文: 本文基于傍轴近似法提出了计算三维弹性波方程的吸收边界条件公式,表示了各边界面、边棱和角点处波场所满足的单程波方程,并在三维弹性波数值模拟中进行了应用。
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英文: The preceding chapter, for the most part, dealt with paraxial theory as applied to thin spherical lens systems.
中文: 前一章讨论的基本上是应用于薄球面透镜系统的傍轴理论。
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