Improvement of image characteristics in high-voltage computed tomography (CT) by applying a compressed-sensing (CS)-based image deblurring scheme

We have established a high-voltage computed tomography (CT) system with a 1–3 MV LINAC x-ray generator for industrial nondestructive testing. However, reconstructed CT images are typically blurred, limiting its image performance, mainly due to the finite focal spot size of the x-ray source, aspects inherent to detector such as the detector pixel size and the detector resolution, and the reconstruction procedure as well. Thus the recovery of the reconstructed CT images from their degraded version is essential for improving the image characteristics. In this work, we investigated the compressed-sensing (CS)-based deconvolution scheme for more accurate image deblurring in CT. We implemented the proposed image deblurring algorithm for CT and performed a systematic simulation and experiment to demonstrate its viability. Our results indicate that the proposed deblurring scheme appears to be effective for the blurring problems in CT and is applicable to improve its present image characteristics.     

核医学仪器中的高压电源

本文叙述了核医学仪器中使用的高压电源的简单工作原理及其发展前景。     

Effect of high-voltage thermal breakdown on pore characteristics of coal

High-voltage thermal breakdown has great potential application in permeability enhancement of coal seam. The characteristics of the breakdown channel, coal element, porosity and microscopic coal petrography of coal under high-voltage electric load were experimentally studied. The coal interior left apparent tracks due to electric current burning with high temperature. The percentage of C, O, Al, Fe, and Si had slightly decreased, while the content of element N increased obviously. Low-pressure nitrogen gas adsorption(LP-N_2GA) and mercury intrusion analysis showed that coal porosity increased. The increases of micropores and mesopores are beneficial to promotion of the ability of gas storage, and the increase of macropores could enhance the gas seepage and migration. The results of scanning electron microscope(SEM) show that there are many exogenous fractures in coal, which is also beneficial to gas seepage and migration. The results lay a theoretical foundation for application of high-voltage thermal breakdown in coal mines.     

通过电能信息采集系统提升反窃电效率的研究

传统反窃电工作开展,需要用电检查人员在单个电费账单分析、得到举报信息等人工处理方式,进行现场检查,工作效率和成效并不高.为提高检查效率,法律数据取证,实时监控等功能设想,研究设计借助供电端和用户端电能信息采集系统,以JAVA EE技术体系,开发与供电公司各信息化平台相集成的深化应用系统.例举系统应用的实际效果和再改进方向.     

GIS、电力电缆及高压电机绝缘的在线检测

对气体绝缘的全封闭组合电器(GIS)、电力电缆和高压电机绝缘的绝缘检测方法、在线检测原理,进行了较全面的介绍,并对某些在线检测方法给出了原理图,供有关人员学习、参考。     

基于EDEM的高压熔断器填料密实度研究

高压熔断器是一种用在高压线路和配电系统中的保护装置,可对故障电路予以安全保护。其结构中石英砂填料的密实度对熔断器的安全性能至关重要,为此本文探究了一种径向冲击旋转熔管的方式来解决熔断器中填料的密实度问题。石英砂颗粒在冲击作用下进行位置的重新排列来降低孔隙率,进而提高填充密实度。本文采用离散元素法,建立了颗粒接触过程的动力学方程,应用EDEM软件模拟了石英砂的振动过程,并通过石英砂填料的填充实验进行了验证。结果证明:径向冲击旋转熔管方式可以使熔管填料的平均密实度达到1.65 g/cm3的密实度要求,同时随着振动时间的增加填充密实度表现出先增加后稳定的规律。     

高压开关盒体制造过程数值模拟技术的研究

高压开关盒体曲面形状复杂,对成形模具质量要求较高,在实际生产中盒体质量一直不能满足设计要求.应用Dynaform冲压模拟软件对高压开关盒体的拉伸成形过程进行有限元模拟分析,找出了高压开关盒体拉伸成形过程中产生缺陷的原因,并提出了改进方案.实验结果表明,利用Dynaform软件对高压开关盒体数字模拟的结果与实际生产过程基本一致.     

高精度高压电压表

本文介绍的高精度高压电压表,是以标准电压通过电容系统比较分压电阻的电压降,避免分压电阻表面漏电流对测量精度的影响。电压测量的相对误差<10~(-4)。     

The use of high-voltage electron microscopy and semi-thick sections for examination of cyanobacterial thylakoid membrane arrangements

High-voltage electron microscopy (HVEM) of semi-thick sections was evaluated as a technique for studying thylakoid membrane arrangements in cyanobacterial cells. Semi-thick sections (0·25 μm) provided important information that was relatively difficult or impractical to obtain by viewing either randomly or serially cut thin sections. Specifically, the semi-thick sections were better suited for visualizing (i) overall thylakoid arrangements and (ii) interconnections between the thylakoids and the cytoplasmic membrane. By comparison, randomly cut thin sections frequently yielded deceptively incomplete or inconsistent data in regard to these specific features. Tilting of thick sections about two perpendicular axes served to improve the clarity of complex membranous intersections and other cell features.     

高压输电线路四分裂导线运输车的设计

高压输电线路是电力远距离传送的重要渠道,运用非常普遍。在工作过程中,由于高压线路悬挂较高,档距较大,巡检维修比较困难。目前主要以人工走线巡查为主,但劳动强度大,安全性不高。设计高压输电线路运输车,以行星齿轮减速电机作动力,以锂电池作能源,其爬坡扭矩大、工作持续时间长。运输车还运用丝杆摆臂越障机构,使其能自动跨越线路中的间隔棒、直线悬垂串、防震锤等障碍,提高了高压输电线巡检维护的工作效率和操作人员的安全性。