输电线路耐张线夹的数字射线检测

耐张线夹的压接质量直接关系输电线路的安全.通过设计相应检测工装、改良检测设备等措施,成功利用数字射线(DR)技术,对耐张线夹的压接质量进行了检测,既满足了相关标准的要求,又提高了检测效率,为输电线路的安全提供了保障.     

数字水准仪测量系统关键算法

针对数字水准仪如何实现自动化读数问题,根据"用不同宽度的条码组合来表征数字水准仪标尺面的不同高度位置"的编码原则,研究了双正弦条码标尺应用于电子水准测量中实现标尺自动化读数的定位原理.基于两正弦信号的相位差和采样值组合都分别与标尺位置一一对应的关系,讨论了两种不同参量的自动测量算法,推导并给出了计算公式,一种方法是采用傅里叶变换和线性换算解码读数,另一种方法是利用条码图像宽度匹配和几何法解码读数.根据两种解码方法各自的特点,选取相应的信号参量设计出合适的条码.条码读数模拟实验结果表明了两种解码算法的有效性.     

IEEE 802.15.4对WLAN抗干扰性能的实验研究

针对2.4 GHz频段内的IEEE 802.15.4,研究其与无线局域网共存时的抗干扰性。实验设定了多种场景并测试了实际应用环境中IEEE 802.15.4的通信质量。实验数据表明,WLAN干扰可使IEEE 802.15.4数据丢包率高达94%。通过实验数据分析得到了IEEE 802.15.4通信节点丢包率与WLAN信道、节点发送功率以及RSSI的相关性,为研究WSN的同频抗干扰技术提供了有价值的实验依据。     

基于列存储的MapReduce分布式Hash连接算法

大数据具有规模大、深度大、宽度大、处理时间短、硬件系统普通化、软件系统开源化的特点。传统关系型数据库在对大数据进行操作时存在系统性能严重下降、计算效率提升有限以及可扩展性差等问题,因此引入MapReduce并行计算模型,提出一种大数据上基于列存储的MapReduce分布式Hash连接算法。首先,设计面向大数据的分布式计算模型,在设计的分片聚集并行连接的基础上,利用Hash连接以及动态探测方法优化了数据并行连接处理效率;然后,针对该算法开发了基于Hadoop的原型系统。通过实验证明,在大数据分析处理中,所提算法在执行时间和负载能力上都有很好的性能表现,也能提供良好的可扩展性。     

不正常航班恢复的飞机和乘客优化调配模型

现实生活中有很多因素影响航空公司的正常运营,比如飞机故障、极端天气、航空管制等,这些问题的产生不仅增加了航空公司的运营成本,而且还给乘客带来许多损失。为了降低航空公司的运营成本和乘客的损失,从飞机调配和受干扰乘客的重新调配出发构建模型,通过IBM ILOG CPLEX软件对两个模型进行求解,并获得了备用恢复行程的飞机调配方案和受干扰乘客的重新调配方案。通过实际算例验证了该模型的有效性和实用性。     

心率信号的采集与处理

介绍了一种基于SoC的简单心率测量方法。整体系统设计包括模拟电路模块和C51CPU核。其中CPU核是数字处理部分，用来处理心率信号和其它应用的输出信号。经过模拟电路模块，心率信号被转换成脉冲信号，然后把脉冲信号作为心率估算的输入信号进行计算。整个系统工作在一片芯片上。     

基于Java 3D的虚拟网络电力监控环境设计

虚拟现实技术（VR）是一项以计算机技术为主,利用计算机等设备构建一个三维虚拟世界,并通过人与虚拟世界的交互。实现人与虚拟世界融为一体的技术。本文介绍了应用Java 3D开发的虚拟现实技术,给出了实现该技术场景创建、动画设计和交互设计技术的部分关键代码。该设计具有开发三维视觉、实现用户网络交互的能力,并已经被运用到远程电力监测系统中。该技术也可以被应用到类似的监控系统的开发中。     

Research on Hot-line Cleaning of Artificial Contaminanted Insulator Using High Pressure Hot Water Vapor

The hot-line cleaning of insulator contaminants has a great significance to prevent pollution flashover.The technique of hot-line cleaning insulator contaminants by water vapor is proposed in this paper.The flashover characteristics of insulator under the procedure of cleaning by hot-line water vapor are tested to investigate the security of cleaning system in the operation.Three kinds of insulator are chosed to carry on the experiment.The average flashover voltage,flashover voltage gradient and withstand voltage in35 kV insulators in hot-line cleaning are measured.The results show that the average flashover voltage and withstand voltage of insulators used for hot-line water vapor cleaning are both larger than the operation phase voltage in 35 kV system.The flashover voltage gradient is larger than usual pollution flashover voltage gradient.The system security can be ensured when there is no overvoltage in the system,which verifies that the insulators cleaning method presented in this paper is effective and reliable.     

Functional organisation of the endomembrane network in the digestive gland of the Venus flytrap: revisiting an old story with a new microscopy toolbox

Up-to-date imaging approaches were used to address the spatiotemporal organisation of the endomembrane system in secretory cells of Dionaea muscipula. Different ‘slice and view’ methodologies were performed on resin-embedded samples to finally achieve a 3D reconstruction of the cell architecture, using ultrastructural tomography, array tomography, serial block face-scanning electron microscopy (SBF-SEM), correlation, and volume rendering at the light microscopy level. Observations of cryo-fixed samples by high-pressure freezing revealed changes of the endomembrane system that occur after trap activation and prey digestion. They provide evidence for an original strategy that adapts the secretory machinery to a specific and unique case of stimulated exocytosis in plant cells. A first secretion peak is part of a rapid response to deliver digestive fluids to the cell surface, which delivers the needed stock of digestive materials ‘on site’. The second peak of activity could then be associated with the reconstruction of the Golgi apparatus (GA), endoplasmic reticulum (ER) and vacuolar machinery, in order to prepare for a subsequent round of prey capture. Tubular continuum between ER and Golgi stacks observed on ZIO-impregnated tissues may correspond to an efficient transfer mechanism for lipids and/or proteins, especially for use in rapidly resetting the molecular GA machinery. The occurrence of one vacuolar continuum may permit continuous adjustment of cell homeostasy. The subcellular features of the secretory cells of Dionaea muscipula outline key innovations in the organisation of plant cell compartmentalisation that are used to cope with specific cell needs such as the full use of the GA as a protein factory, and the ability to create protein reservoirs in the periplasmic space. Shape-derived forces of the pleiomorphic vacuole may act as signals to accompany the sorting and entering flows of the cell.