变电站综合自动化系统的结构方式

变电站综合自动化系统是电网改造中的重要设备。而系统的结构方式是制约设备性能、造价和可靠性的关键因素。本文结合作者多年来从事电力自动化方面的研究和实践,从分析系统结构方式入手,说明了不同结构方式对设备的性能、造价和可靠性所产生的截然不同的效果。     

Power-aware routing based on DSR for Mobile Ad hoc NETworks

Energy consumption is a crucial design concern in Mobile Ad hoc NETworks （MANETs） since nodes are powered by batteries with limited energy, whereas Dynamic Source Routing （DSR） protocol does not take the energy limitation of MANET nodes into account. This paper proposes an energy-saving routing algorithm based on DSR： Power Aware Routing protocol based on DSR （PAR-DSR）. The design objective of PAR-DSR is to select energy-efficient paths. The main features of PAR-DSR are： （1） Nodes use the Signal Attenuation Rate （SAR） to conduct power control operations; （2） Minimum path cost as metric to balance the traffic and energy consumption of wireless nodes. The simulation results show that PAR-DSR can greatly reduce the energy consumption of MANET nodes. The average node lifetime of PAR-DSR is 50%-77% longer than that of DSR.     

城区光缆资源协同优化方式探析

内容摘要：本文分析现有城区光缆网存在的问题,制定网络能力评估方案,结合网络发展总体思路,从管理实施、业务承载及网络结构和新技术应用三个方面提出光缆资源使用和协同其他网络的优化方案,以充分提升网络能力,降低建设成本,提高响应速度,为5G、网络重构及各项业务开展提供资源充沛、组织合理的基础支撑平台。     

Effect of H2O2 concentration on electrochemical growth and properties of vertically oriented ZnO nanorods electrodeposited from chloride solutions

In this work, ZnO nanostructures are electrodeposited on a transparent conducting glass from chloride baths. The influence of H₂O₂ concentration on the electrochemical characteristics has been studied using cyclic voltammetry (CV) and chronoamperometry (CA) techniques. From the analysis of the current transients on the basis of the Scharifker–Hills model, it is found that nucleation mechanism is progressive with a typical three-dimensional (3D) nucleation and growth process; independently with the concentration of H₂O₂. However, the nucleation rate of the ZnO changes with the increase of H₂O₂ concentration. The Mott–Schottky measurements demonstrate an n-type semiconductor character for all samples with a carrier density varying between 5.14×10¹⁸ cm⁻³ and 1.47×10¹⁸ cm⁻³. Scanning electron microscopy (SEM) observations show arrays of vertically aligned ZnO nanorods (NRs) with good homogeneity. The X-ray diffraction (XRD) patterns show that the ZnO deposited crystallises according to a hexagonal Würtzite-type structure and with the c-axis perpendicular to the electrode surface. The directional growth along (002) crystallographic plane is very important for deposits obtained at 5 and 7 mM of H₂O₂. The high optical properties of the ZnO NRs with a low density of deep defects was checked by UV–vis transmittance analyses, the band gap energy of films varies between 3.23 and 3.31 eV with transparency around 80–90%.     

一种基于二次规划计算DFE系数的新方法

判决反馈均衡器(DFE)是一种常见的均衡器类型,在实际中得到了广泛应用。对于采用最小均方误差(MMSE)准则设计的DFE,其系数计算一般利用正交原理推导获得。该文推导了一种新颖的基于二次规划方法计算MMSE准则下DFE系数的方法。仿真表明,该文所提方法与传统方法计算得到的结果是一致的,并且由于运用矩阵运算,在一定程度上简化了计算。     

Hydrogen-assisted low-temperature plasma-enhanced chemical vapor deposition of thin film encapsulation layers for top-emission organic light-emitting diodes

In this work, we developed a single high-performance SiN_x encapsulation layer that can be directly integrated into organic devices by low-temperature plasma-enhanced chemical vapor deposition (PECVD). We investigated a hydrogen-assisted low-temperature PECVD process at a temperature of 80 °C. The thin film density improved with an increased hydrogen gas ratio, and the moisture permeability was less than 5 × 10⁻⁵ g/m²·day. To verify the stability of the PECVD process, we applied the SiN_x encapsulation layer directly to top-emitting organic light-emitting diodes. The results showed minor changes in the current-density–voltage characteristics after the PECVD process, as well as high reliability after a water dipping test.     

变压器油中溶解氢气在线监测仪的研制

用气相色谱法检测中溶解的可燃气体可以预报变压器内部存在的潜伏性故障。用本文研制的在线监侧仪检测油中的氢气比气相色谱法更能及进地做到这一点。本文介绍了该仪器的原理和结构特点。该仪器具有结构简单,安装方便性能稳定,寿命长,不需要经常维护等特点。     

氢键抑制方法减少瓜尔胶压裂液对砂岩储层的吸附伤害

为了减轻瓜尔胶压裂液在砂岩多孔介质中产生的吸附伤害、降低其对致密砂岩储层渗透率的伤害,以四川盆地中侏罗统沙溪庙组砂岩为研究对象,根据热重实验确定瓜尔胶在砂岩表面的吸附量,并利用X射线电子能谱测试结合岩心流动实验,分析瓜尔胶压裂液在砂岩多孔介质中的吸附作用机理,再通过核磁共振和CT成像,研究压裂液吸附对砂岩孔喉结构变化和氢键抑制剂对压裂液综合性能的影响。研究结果表明:(1)压裂液会吸附在岩石多孔介质内部,导致岩石孔径变小、储层渗透性变差,吸附量约为3.9 mg/g;(2)砂岩表面的含氧基团与瓜尔胶分子形成的多重氢键作用是砂岩多孔介质与压裂液之间发生吸附的主要作用力,氢键抑制剂可以降低瓜尔胶在砂岩中的吸附量和对储层渗透率的伤害程度;(3)氢键抑制剂的加入对压裂液流变性影响不大,但却可以有效地降低破胶液的表面张力和残渣含量。结论认为,氢键抑制剂可以解除瓜尔胶与砂岩的吸附作用,有效地降低瓜尔胶压裂液对储层的伤害,并且不会影响压裂液的综合性能;该研究成果对于认识氢键抑制剂的性能、改进瓜尔胶压裂液体系、提高致密砂岩储层的增产改造效果等都具有重要的意义。     

三峡工程造价管理方法分析

本文阐述了三峡工程造价管理的特点、造价管理方法分析和造价管理的新途径。     

液体火箭发动机研制情况的一些回顾

４０年来，我国液体火箭发动机的研制工作取得了很大成绩。文中对发动机的一些研制情况作了回顾，对ＹＦ－７３和ＹＦ－７５氢氧发动机的设计特点、飞行结果作了简单叙述。对今后工作也提出了看法。