针对现有图像重定向方法视觉效果差和处理速度慢的问题，提出一种基于主成分分析法和分块的内容感知图像重定向方法。首先，利用主成分分析法融合梯度图和显著图来提取更加丰富的图像特征，避免主体信息失真；其次，相邻裁缝线由均值代替，避免像素不连贯；最后，根据能量图中列能量值的大小将图像分为显著区域和非显著区域，并行缩放分块，更加注重图像特征并提高运行效率。在MIT RetargetMe、DUT-OMRON和NJU2000数据集上进行实验分析，以主观感受和客观因子运行时间、SIFT-flow作为评价指标，与几种常用算法对比。实验结果表明，该方法保证了图像主体信息的完整性，平均运行时间为线裁剪算法的1/3。本文提出的方法不仅具有较优的视觉效果，而且可降低运算量。

A new theoretical method to study super-multiperiod superlattices has been developed. The method combines the precision of the 8-band kp-method with the flexibility of the shooting method and the Monte Carlo approach. This method was applied to examine the finest quality samples of super-multiperiod Al_0.3Ga_0.7As/GaAs superlattices grown by molecular beam epitaxy. The express photoreflectance spectroscopy method was utilized to validate the proposed theoretical method. For the first time, the accurate theoretical analysis of the energy band diagram of super-multiperiod superlattices with experimental verification has been conducted. The proposed approach highly accurately determines transition peak positions and enables the calculation of the energy band diagram, transition energies, relaxation rates, and gain estimation. It has achieved a remarkably low 5% error compared to the commonly used method, which typically results in a 25% error, and allowed to recover the superlattice parameters. The retrieved intrinsic parameters of the samples aligned with XRD data and growth parameters. The proposed method also accurately predicted the escape of the second energy level for quantum well thicknesses less than 5 nm, as was observed in photoreflectance experiments. The new designs of THz light-emitting devices operating at room temperature were suggested by the developed method.

Anode materials are an essential part of lithium-ion batteries (LIBs), which determine the performance and safety of LIBs. Currently, graphite, as the anode material of commercial LIBs, is limited by its low theoretical capacity of 372 mA·h·g^?1, thus hindering further development toward high-capacity and large-scale applications. Alkaline earth metal iron-based oxides are considered a promising candidate to replace graphite because of their low preparation cost, good thermal stability, superior stability, and high electrochemical performance. Nonetheless, many issues and challenges remain to be addressed. Herein, we systematically summarize the research progress of alkaline earth metal iron-based oxides as LIB anodes. Meanwhile, the material and structural properties, synthesis methods, electrochemical reaction mechanisms, and improvement strategies are introduced. Finally, existing challenges and future research directions are discussed to accelerate their practical application in commercial LIBs.

针对复杂电磁对抗环境中电子信息装备面临的强电磁环境威胁以及防护加固需求，对强电磁防护技术的发展现状进行了综述，并提出了强电磁系统级综合防护的发展展望。强电磁防护是为了保证电子信息装备在强电磁环境中免受损伤或损毁的技术手段，从电磁波的耦合途径分析了当前电磁防护的重点和难点，然后分别以限幅器技术、频率滤波技术、能量选择防护技术三个方面对前门防护技术的发展现状进行了分析总结，最后从新型屏蔽材料和防护器件两个方面对新型电磁防护技术进行了展望，并从前后门一体防护、场路一体防护、多域联合防护三个角度对系统级电磁防护进行了总结，为电子信息装备在复杂电磁环境下的电磁防护加固设计提供了支撑。

针对高能激光器出光过程中出现的大量离焦和0°像散低阶像差现象，提出了基于哈特曼波前传感器和二维整形光路的XY离焦像差校正方法。首先，通过对Zernike多项式的离焦项和0°像散项进行线性组合得到XY离焦像差的表达式，该XY离焦像差系数的大小可直接表征X离焦和Y离焦的波前PV值。同时，通过微调高能激光器中二维整形光路中的镜子间距，可实现激光器输出光束XY离焦波面的补偿。因此，首先利用哈特曼波前传感器提取出光束的XY离焦像差系数大小，而后再根据XY离焦像差系数的大小实时闭环微调二维整形光路中的镜子间距，从而实现XY离焦像差的校正，改善输出光束的光束质量。实验结果表明，该方法可有效地将高能激光器输出光束XY离焦量的PV值由5.2 μm和1.1 μm校正到0.5 μm以下，相应的光束质量β因子由3.1降到1.8，光束质量得到明显改善。