调度自动化系统PAS高级软件的应用

PAS应用软件基本功能的实用化在国内外已经成为一种必然发展趋势，根据哈尔滨地区电网的实际应用情况综述了其结构、功能，提出了该软件的实用性和有待改进与完善的地方。     

基于红外光声光谱的气体检测系统设计

随着工业现代化的发展,环境变化日益复杂,而人民的环境健康意识也在不断提高.在这种情况下,传统的气体检测系统已不能满足要求,有待开发一种高灵敏度、高分辨率的新型实时气体检测系统.从气体分子红外光谱理论出发,在对当前各种气体检测方法进行分析比较的基础上,设计了一种基于光声光谱技术的气体检测系统.实验证明：该系统可有效进行CO2气体检测.     

长治电网SCADA/PAS/DTS/集控中心一体化系统应用实践

介绍了长治电网SCADA/PAS/DTS/集控中心一体化系统的开发平台、体系结构、技术特点、实现方式,着重阐述了PAS/DTS一体化实现模式,介绍了一体化系统实现的主要功能.     

省地调一体化PAS的设计和三级调度DTS联网

为解决各级调度机构之间由于模型等信息无法共享所造成的PAS及DTS系统应用水平的制约问题,研究了如何利用模型拼接的成果来建设省地一体化PAS系统及进行三级调度DTS联网,提出了网、省、地三级调度模型拼接方案。在此基础上就省地一体化PAS的实现分别提出了两种基本方案,比较了两者的优缺点,同时提出了一种综合式分析计算方案。在拼接好的模型基础上提出了三级调度DTS联网方案。分析表明:综合式分析计算方案更具工程可行性,三级调度DTS联网方案具有良好的工程适用性。     

Sintering Mechanism and Microstructure of TaC/SiC Composites Consolidated by plasma-activated sintering

TaC/SiC composites with 5 wt% SiC addition were densified by plasma-activated sintering (PAS) at 1500–1800 °C for 5 min under 30 MPa. The effects of plasma-activated sintering on microstructures, densification and mechanical properties of the composites were investigated. The results showed that TaC/SiC composites achieved a relative density more than 99% of the theoretical density at 1600 °C. A low eutectic liquid phase generated by the oxide on the particle surface was observed in the composite to realize a relatively low temperature sintering densification. While the TaC particle size decreased insignificantly with increasing sintering temperature, the transformation of morphology of SiC particles changing from equiaxed to elongated grain was activated, accompanying with a slight particle size decreasing of the SiC phase, thus promoting a relatively high flexural strength of 550 MPa under 1800 °C. Besides, some ultra-fine 2 nm Ta₂Si was observed in the glassy pockets, strengthening the amorphous phase and thus increasing the flexural strength.     

Comparison of the crystalline properties and structural changes of starches from high-amylose transgenic rice and its wild type during heating

A transgenic rice line (TRS) enriched amylose and resistant starch has been developed by antisense RNA inhibition of starch branching enzymes. In this study, gelatinisation and crystalline properties, swelling power, water solubility, morphological and structural changes of starches from TRS and its wild-type Teqing (TQ) were carefully investigated during heating. Compared to TQ, TRS starch showed higher gelatinisation temperatures, lower gelatinisation enthalpy and swelling power. Morphological and structural changes showed that TQ starch drastically swelled after 70 °C, then gradually disrupted with increasing heating temperature. The surrounding band of TRS starch restrained granule swelling, though the subgranules disrupted to form the cavity. The results of spectroscopic analyses indicated that A-type crystalline of TQ changed to amorphous starch after 75 °C, while C-type crystalline of TRS gradually changed to B-type crystalline after 75 °C, then became amorphous starch at 95 °C. These results add to our understanding of the effect of heating on the high-amylose rice starch.     

电网调度自动化系统的开发应用

电网调度自动化系统是利用现代化先进的电子技术,计算和网络技术和通信技术,将网上的实时数据,离线数据、电网结构、设备参数和地理信息等多种信息进行综合处理和集成,形成调度自动化系统。从结构上分为变电所数据采集（RTu）、通信通道、计算机系统主站三个部分。目前、盘曙电网35座变电所已经实现电网调度自动化,其中微机综合自动化变电所10座,老式变电站25座。运行可靠稳定,安全运行水平显著提高,实现了调度管理自动化。     

MIMO信道中衰落信号的多谱勒功率谱

MIMO系统中的角度功率谱有多种分布形式,所以经典多普勒功率谱不再适用。针对常用的均匀分布、余弦分布、高斯分布和拉氏分布的入射波角度功率谱,分别推导了多谱勒功率谱解析式。通过仿真比较了不同角度功率谱下的多普勒功率谱,并分析各种参数对其的影响。这些工作对MIMO信道中频率扩散的刻画做了拓展。     

基于PAS6201的ONU硬件设计与实现

FTTH的光纤接入将是用户的终极接入方式,也是网络发展的必然趋势.无源光网络PON技术将成为实现FTTH的最佳网络结构,而EPON也将成为实现FTTH的最佳接入技术.文章基于PAS6201芯片完成了符合IEEE802.3ah标准的EPON ONU硬件平台的设计和开发.该硬件平台可以满足EPON ONU功能要求,且具有性能稳定、配置维护灵活的特点.     

多输入多输出信道空域相关性评估简化模型

针对任意散射环境的多输入多输出(MIMO)信道,提出一种基于角度域脉冲采样的空域相关性评估简化模型,推导常见采样脉冲空域相关系数的近似简化解析式,并详细分析简化模型中采样脉冲数目和加权系数的选取依据,大大降低MIMO衰落信号空域相关性分析的复杂度.仿真结果表明:当到达波角度扩展为5到20度且采样脉冲数目大于36时,本文...