磁控溅射系统中薄膜厚度的均匀性是关键指标之一。通过分析磁场强度、靶材与基板的距离和气体压强对Si₃N₄和SiO₂两种薄膜厚度均匀性的影响,借助Langmuir探针分析等离子体的密度,并采用二进制阶梯式充气方式调整纵向的均匀性。通过对靶材加载正弦半波电压并使用MATLAB软件确定振幅及相位参数,从而调整横向的均匀性。实验结果表明,对于Si₃N₄膜层,其在横向上、中和下的均匀性分别为±1.27%、±0.62%和±1.33%,纵向的均匀性为±0.33%;对于SiO₂膜层,其在横向上、中和下的均匀性分别为±1.12%、±0.42%和±1.23%,纵向的均匀性为±0.25%。

The three-dimensional (3D) mechanical response of the cornea to intraocular pressure (IOP) elevation has not been previously reported. In this study, we use an ultrasound speckle tracking technique to measure the 3D displacements and strains within the central 5.5mm of porcine corneas during the whole globe inflation. Inflation tests were performed on dextran-treated corneas (treated with a 10% dextran solution) and untreated corneas. The dextran-treated corneas showed an inflation response expected of a thin spherical shell, with through-thickness thinning and in-plane stretch, although the strain magnitudes exhibited a heterogeneous spatial distribution from the central to more peripheral cornea. The untreated eyes demonstrated a response consistent with swelling during experimentation, with through-thickness expansion overriding the inflation response. The average volume ratios obtained in both groups was near 1 confirming general incompressibility, but local regions of volume loss or expansion were observed. These results suggest that biomechanical measurements in 3D provide important new insight to understand the mechanical response of ocular tissues such as the cornea.

对光子晶体光纤的后处理技术进行了详细的分析和讨论,包括拉锥、空气孔膨胀后拉锥、选择性空气孔塌缩。利用这些后处理技术,可以改变光子晶体光纤的结构参数,如空气孔大小、纤芯大小和形状等,制作各种不同类型的光子晶体光纤光器件。

空间薄膜反射镜由于具有面密度低,易于折叠展开且成本低等优点很好地满足了空间反射镜的超轻量、超大口径的要求,因此在空间科学研究领域倍受关注。介绍了空间薄膜反射镜的发展,包括薄膜反射镜的理论基础,充气式薄膜反射镜和静电拉伸薄膜反射镜及其他类型的反射镜的代表成果。而后对空间薄膜反射镜的技术难点进行了分析;重点讨论了薄膜反射镜用聚酰亚胺薄膜的生产情况以及薄膜反射镜的面形控制、面形检测和反射镜支撑结构的设计。最后总结了反射镜近期的研制情况、存在的问题和应用发展趋势。认为空间薄膜反射镜作为国内外空间科学的热点,在未来的几十年内将在航天领域的太空望远镜、空间侦察相机、人造太阳、微波天线等方面得到广泛应用。

针对天空背景下低信噪比的飞行器，提出了一种基于SUSAN算法、灰色系统理论和数学形态学相结合的飞行器结构特征提取的新方法。在Visual C++6．0平台下，首先利用SUSAN算法从背景中提取飞行器的结构边缘信息，并与原图像相加实现目标增强；然后用灰色系统理论检测出飞行器的结构特征边缘；最后利用条件膨胀和重构算法，实现云层的抑制，并重构出飞行器目标。实验结果表明：该方法对于实现飞行器的跟踪、结构特征提取以及事后判读有重要的意义，同时验证了该方法的可行性。