Based on the density functional theory with hybrid functional approach, we calculated the structural, electronic, and the optical properties of Cu₂MgSn(S_1-xSe_x)₄ (CMTSSe)，an potential photovoltaic material for thin film solar cells. The calculation reveals a phase transition from kesterite to stannite structure when Zn atoms are substituted by Mg atoms. In particular, the S-to-Se ratio can determine the energy splitting between the electronic states at the top of the valence band. The band gaps of CMTSSe can be tuned in the ranges of 1.01—1.58 eV. Calculated optical properties and tunable band gaps make them beneficial for achieving band-gap-graded solar cells.

通过溶胶-凝胶法制备了Er3+、Yb3+和Gd3+共掺杂的Y2O3、Lu2O3荧光粉, 并研究了其上转换发光和温度敏感特性。在980 nm激光激发下, 样品辐射出明亮的绿光、红光和弱的紫外光。并讨论了紫外区Er3+→Gd3+的能量传递。利用荧光强度比方法研究了基于Er3+的2H11/2和4S3/2两个热耦合能级在313～573 K范围内的光学温度传感特性, 当Gd3+离子掺杂浓度为10%时, 样品的灵敏度最大为0.005 91 K-1。

实验研究了香肠状回音壁光学微腔，测量了单个微腔的光学传输谱线.实验结果表明，当从两端拉伸香肠状微腔的时候，观测到的光学模式的共振波长会随着拉伸量的增加而减小，而且不同模式的共振波长减小的速度存在差异.通过拉伸香肠状微腔的方法，实验观察到了单个香肠状微腔中的Fano共振现象.另外，实验上也观测到了与Fano共振现象相关的类电磁诱导透明现象。实验所涉及到的回音壁模式的品质因子高达108.

采用共蒸发法在不同衬底温度下沉积Cu2ZnSnSe4（简称CZTSe)薄膜, 分析了衬底温度对CZTSe材料性质及电池性能的影响。研究表明: 当衬底温度较低时（380 ℃), CZTSe薄膜中含有SnSex使电池失效; 随着衬底温度的升高, CZTSe薄膜的结晶质量明显提升, 电池开路电压增加。但当衬底温度达到460 ℃时, 电池的转换效率反而下降; 结合CZTSe的生长机理及器件模型分析了电池效率下降可能的原因。最终在衬底温度420 ℃的条件下制备出效率为3.12%（有效面积0.34 cm2)的CZTSe太阳电池。

Cu2ZnSnSe4 (CZTSe) absorbers were deposited on borosilicate glass substrate using the low-temperature process, and different Na incorporation methods were applied to investigate the effects of Na on the CZTSe growth. Na was dif-fused into some of the absorbers after growth, which led to strongly improved device performance compared with Na-free cells. With the post-deposition treatment, the effect of Na on CZTSe growth was excluded, and most of Na was expected to reside at grain boundaries. The conversion efficiency of the completed device was improved due to the enhancement of open circuit voltage and fill factor. The efficiency of 2.85% was achieved at substrate temperature as low as 420 ℃.

We theoretically study the evolution of dark solitons in the biased photorefractive-photovoltaic crystal by using beam propagation method (BPM). We find that when the absolute value of the extra bias field is less than the photovoltaic field, the dark screening-photovoltaic (SP) solitons can be observed. The initial width of the dark notch at the entrance face of the crystal is a key parameter for generating an sequence of dark coherent solitons. If the initial width of the dark notch is small, only a fundamental soliton or Y-junction soliton pair is generated. When the initial width of the dark notch is increased, the dark notch tends to split into an odd (or even) number of multiple dark solitons, which re-alizes a progressive transition from the low-order solitons to a sequence of higher-order solitons.

为处理低检测概率情况下目标漏检的情况，引入一种新的多帧状态估计机制，提出了一种基于多帧状态估计机制的高斯混合概率假设密度滤波器。该机制依据不同时间步骤的目标权值来构建每个目标的历史权值矩阵和状态提取标识符。在目标跟踪过程中，当一些连续运动目标在某些时间步骤漏检时，通过多帧状态估计机制，充分依据关联目标的权值矩阵和状态提取标识符来对目标的当前状态进行估计。仿真实验表明，所提算法在保证跟踪有效性的同时，能够在低检测概率且杂波率相对较高的情况下显著提高目标的跟踪性能，具有较强的鲁棒性。

提出一种新的基于广义交叉协方差(GCI)和平均边缘概率密度(AMD)的分布式多目标融合机制。传统的多传感器跟踪算法存在一些难以克服的缺点: 如航迹关联性能对关**数设置敏感, 航迹关联计算量随目标个数增加呈指数增加等。为解决这些问题, 提出一种适用于多目标的鲁棒性较好的分布式融合算法。首先, 将多目标联合后验概率密度近似为关于其AMD的积分布; 然后, 考虑到不同雷达节点之间的未知的互相关, 采用GCI融合算法进行融合。由于航迹关联过程被内嵌在航迹融合过程中, 所提分布式融合机制同时进行航迹关联和航迹融合, 理论上会更加完备。所提算法借助高斯混合模型实现, 试验结果证明其性能相比传统融合算法有很大改善。

采用水热法成功制备了Yb3+,Ho3+,Tm3+三掺的多晶KLa(MoO4)2荧光粉。在980 nm激光激发下, KLa(MoO4)2∶Yb3+,Ho3+,Tm3+发出裸眼可见的明亮白光, 这其中包括Tm3+离子发出的蓝光(～475 nm)、Ho3+离子发出的绿光(～540 nm)和红光(～651 nm)。根据色度坐标系计算得出的坐标点可以看出, 随着Ho3+/Tm3+掺杂浓度之比的增加, KLa(MoO4)2∶Yb3+,Ho3+,Tm3+所发出的白光呈现从冷白光到暖白光的变化。最后详细讨论了KLa(MoO4)2∶Yb3+,Ho3+,Tm3+荧光粉可能的发光机制。

针对异类传感器多目标跟踪系统中的动态数据关联问题,提出了一种基于KL距离的异类传感器动态数据关联算法。该方法将静态多维分配问题推广到动态跟踪中,通过对量测集合与航迹集合的合并,将各传感器量测估计位置的概率密度函数与目标航迹一步预测值的概率密度函数之间的KL距离作为关联代价函数,继而代入多维分配模型求解,从而实现量测到航迹的动态关联。仿真实验表明,所提算法能更精准地反映量测与航迹之间关联的可能性,且能够对多目标进行快速稳定的跟踪。