反应堆系统内压力波传播将造成水力学载荷问题，压力波传播的精确模拟对结构载荷分析而言尤为重要。系统分析程序（RELAP5、TRACE等）被广泛应用于反应堆压力波传播模拟，但系统分析程序通常只能处理压力波单向一维传播行为，为应对压力波多向多维传播问题，本文就汽水两相流中存在的压力波二维传播行为，开展了相关模型与算法研究。具体采用了二维轴对称圆柱坐标系，考虑了汽水两相非平衡态相变传热、传质行为，偏微分方程求解使用了时间步分割四步算法，开发了程序代码TPFPWPC-2D。采用典型汽、水两相激波管基准例题开展了程序验证，结果符合较好。为考查程序处理压力波二维传播的能力，对圆柱体空间区域内的压力波传播行为进行了数值模拟，结果显示该程序捕捉到了压力波的二维传播特性，尤其是压力波的反射与叠加特性。

Optical superoscillation refers to an intriguing phenomenon of a wave packet that can oscillate locally faster than its highest Fourier component, which potentially produces an extremely localized wave in the far field. It provides an alternative way to overcome the diffraction limit, hence improving the resolution of an optical microscopy system. However, the optical superoscillatory waves are inevitably accompanied by strong side lobes, which limits their fields of view and, hence, potential applications. Here, we report both experimentally and theoretically a new superoscillatory wave form, which not only produces significant feature size down to deep subwavelength, but also completely eliminates side lobes in a particular dimension. We demonstrate a new mechanism for achieving such a wave form based on a pair of moonlike sharp-edge apertures. The resultant superoscillatory wave exhibits Bessel-like forms, hence allowing long-distance propagation of subwavelength structures. The result facilitates the study of optical superoscillation and on a fundamental level eliminates the compromise between the superoscillatory feature size and the field of view.

针对包含近源障碍物条件下的电波传播问题，提出了一种新颖的电波传播预测混合建模方法：矩量法（MOM）和圆柱坐标系抛物方程法（PEM）混合建模方法（MOM-PEM）；MOM用于包含辐射源和近源障碍物的小圆柱区域内的电波传播建模，PEM用于MOM计算空间外的大区域范围内电波传播建模。MOM和PEM的计算过渡区域进行精细化网格剖分处理以避免场强数值传递的不兼容。仿真模拟了三类近源障碍物存在场景下的电波传播问题：有限开窗屏障碍物、立方体障碍物以及包含辐射源的半封闭空间障碍物，并将混合算法计算得到的结果和相同环境下采用全矩量法计算得到的结果进行了数值对比，结果表明混合算法和矩量法在精度上吻合较好。