| ID | 原文 | 译文 |
| 2773 | 热阴极广泛应用于真空电子器件、加速器、自由电子激光等各类束流装置，热阴极表面状态非均匀性对束流本征发射度有着显著的影响。 | Surface non-uniformity including temperature, work and geometric profile affect intrinsic emittance of thermionic cathode of vacuum electronics and accelerators. |
| 2774 | 本文推导了非均匀发射阴极的均方根本征发射度理论形式，并分析了逸出功非均匀性及其统计效应对本征发射度的影响。 | In order to understand how intrinsic emittance is manipulated bywork function variation, a general intrinsic emittance model consisting of contributions from surface non-uniformity was de-veloped. |
| 2775 | 针对逸出功径向和一维余弦分布模型，计算了均方根发射度与逸出功非均匀性关系的理论数值解;基于有限差分法粒子仿真技术，开发了专用于阴极仿真的程序 YY-PICMC，并验证了理论形式的正确性; | Finite-difference time-domain particle-in-cell (FDTD-PIC)simulation verified numerical calculation result of cath-odes with work function radical variation and 1D cosine periodic variation. |
| 2776 | 针对逸出功二维余弦分布模型进行了理论和仿真分析，结果表明逸出功分布空间频数对均方根发射度涨落有显著影响，当空间频数趋于无限大时，发射度增长系数趋于 1，即逸出功均匀阴极的情形; | Furthermore, theoretical results and simulation forcathodes with work function of 2D cosine periodic variance and 2D random distribution showed that emittance increase coef-ficient approaches to 1 and variance of emittance increase coefficient decreased quickly when spatial frequency increased. |
| 2777 | 最后，分析了最接近真实阴极表面状态的二维逸出功随机分布模型，仿真结果表明随着空间频数增加，发射度增长系数统计方差逐渐减小，符合余弦模型结果的预期。 | This paper shows that work non-uniformity hardly affects intrinsic emittance if cathode diameter is much larger than the av-erage size of micro work region;in contrast, intrinsic emittance may differ from uniform case notably if micro size is compa-rable to cathode diameter. |
| 2778 | 本文建立的理论形式和仿真方法可以用于评估各类阴极表面逸出功空间非均匀性特征对束流本征发射度的影响程度。 | Moreover, theoretical model and simulation method are useful to assess influence of work or tem-perature non-uniformity on intrinsic emittance of kinds of cathode. |
| 2779 | 为改进亮度保持双直方图均衡算法的不足，提出基于最大熵模型的动态范围优化方法，扩展了双直方图均衡算法的应用范围，使之不仅适用于正常亮度图像，对低照度及高亮图像也能取得较好的效果。 | In order to improve the drawback of brightness preserving bi-histogram equalization (BHE)algorithms, adynamic range optimization method based on maximum entropy model is proposed to extend the application range of BHE algorithms, which makes it not only suitable for normal brightness image, but also can get good effect on low illumination and high brightness image. |
| 2780 | 算法首先选用大津法确定直方图数据分割点; | Firstly, the segmentation point decided by Otsu divides the original histogram into two sub-histo-grams. |
| 2781 | 然后对初始直方图进行预处理; | And then, a hybrid adjustable method is proposed to pre-process the initial histogram. |
| 2782 | 根据所提出的最大熵模型确定最佳的动态范围分割点; | After that, based on the pro-posed maximum entropy model, the best dynamic range segmentation point is determined by an ergodic optimization meth-od. |