分布式机电仪器网络微损坏移动节点检测研究

分布式机电仪器网络中容易发生移动节点微损坏现象,影响移动节点间的正常通信。传统的检测方法忽略了移动节点能量参数对检测结果的影响,使部分正常节点被错误滤除,降低检测精度。提出一种新的基于节点剩余能量等级的分布式机电仪器网络微损坏移动节点检测方法。建立分布式机电仪器网络模型,在此基础上构建移动节点能耗模型,计算分布式机电仪器网络安全阈值。同时计算剩余能量级别,获取分布式机电仪器网络微损坏移动节点标准值。当移动节点间出现报警信息时,基站会计算参与报警的移动节点标准值。将获取的数据和移动节点能级的临界值相比,判断出微损坏节点,完成网络微损坏移动节点的检测。实验结果表明,所提方法检测精度高。

场馆局部微损坏数字虚拟再现仿真研究

利用目前方法再现体育场馆环境时,忽略了对体育场馆数字全息图的滤波处理,存在场景还原性较差的问题。为此提出基于虚拟现实的场馆局部微损坏数字再现方法。方法首先针对虚拟现实技术的特点,构建了一个虚拟现实系统,达到人机交互的效果,同时在虚拟现实系统中引入可视化技术,将采集的体育场馆局部微损坏数据转换成图像,输入到系统内,实现体育场馆局部微损坏数据的可视化展示;在系统内选取一组可视化数字图像数据,利用傅里叶计算方法获取场馆局部微损坏数字全息图,通过光场强度分布获取数字影像。为了提升数字影像的再现效果,采用拉普拉斯算法对全息图进行去噪处理,实现体育场馆局部微损坏数字影响的再现。实验测试结果表明,不同离焦误差下,影像再现的相位误差均较小,验证了该方法的有效性强、实用性高。

Concrete Erosion in Weak Sulfate Environment

The erosion failure mechanism of concrete is studied systematically based on field investigation and laboratory experiments of concrete samples from more than 30 km concrete lining and 10 hydraulic structures of Shandong Jiaodong water diversion project, in which the concrete failed only 3-6 months after conslruction was completed. With electron microscopy scanning, energy dispersive analysis, XKD （X-ray diffraction） analysis and Raman spectrum analysis of the mineral composition of the failure concrete and precipitates, chemical and physical reactions that occurred in the concrete under engineering environment were investigated. The analysis indicated that the rapid corrosion and dissolution reaction of the concrete in weak sulfate environment is due to sulfate and carbonate corrosion with the catalytic magnesium salt at low temperature. Also, corrosion damage facilitates the sulfate ions and carbonate ions into the concrete, and the expansion of ettringite and TSA （thaumasite sulfate attack） reaction also accelerates the corrosion damage of the concrete.