500kV变压器噪音变化原因分析

文章以变压器的实际运行分析为主,给出了变压器噪音变化的基本原理、特点,结合实际分析了影响噪音变化的内外部原因,从变电站运行环境,探讨各种因素对变压器本体运行噪音的影响。

微表处混合料室内加速加载试验

针对现有微表处性能实验评价方法的不足,提出基于"轮胎驱动式路面功能加速加载试验系统"的材料性能评价方法,对掺加不同改性乳化沥青的微表处混合料进行室内加速加载试验.结果表明,改性乳化沥青残留物性质对微表处混合料性能有直接影响,适宜的沥青能够延长使用年限73%,提升长期效益60%;摆值、构造深度指标与宽度变形率间相关系数为0.74与0.77;"微表处混合料蠕变度"K指标反映材料抗滑性能变化的敏感度,可用以描述混合料蠕变与矿料重分布.试验也表明"轮胎驱动式路面功能加速加载试验系统"可真实模拟轮胎与路面间的相互作用.

改性乳化沥青对微表处混合料性能的影响

微表处对防止路面松散、延缓路面老化、提高路面摩擦和弥补路面微小的缺陷有着良好的效果,在路面养护工程中得到广泛的运用。然而,现有设计指南中评价微表处路用性能的试验手段与实际情况差异较大,影响了微表处技术的应用与发展。本研究采用"轮胎驱动式路面功能加速加载试验系统"为基础试验平台,对添加不同改性乳化沥青的微表处混合料进行室内加速加载试验,研究微表处混合料性能变化规律,并定量评价沥青类型对其性能的影响。研究成果对推动微表处技术的应用与发展具有重要意义。

Poisson Noise Removal Based on Nonlocal Total Variation with Euler's Elastica Pre-processing

An enhancement-based Poisson denoising method for photon-limited images is presented. The noisy image is firstly pre-processed for enhancing incomplete object information, and then it is denoised while preserving the restored structural details. A variational regularization model based on Euler’s elastica (EE) is proposed for image enhancement pre-processing. A nonlocal total variation (NLTV) regularization model is then employed in the second stage of image denoising. The above two optimization problems are solved by the alternating direction method of multipliers (ADMM). For Poissonian images with low image peak values, experiments demonstrate the validity and efficiency of the proposed method for both restoring geometric structure and removing noise. © 2017, Shanghai Jiaotong University and Springer-Verlag GmbH Germany.