电力设备资产管理、PAS55及其工程培训

简要介绍了设备资产管理的起源、相关基本概念及国内外发展现状,重点介绍了英国国家标准学会资产管理标准PAS 55的基本构成,并对设备资产管理的培训工作提出了建议.     

Developing architecture for upgrading I&C systems of an operating nuclear power plant using a quality attribute-driven design method

This paper presents the architecture for upgrading the instrumentation and control (I&C) systems of a Korean standard nuclear power plant (KSNP) as an operating nuclear power plant. This paper uses the analysis results of KSNP's I&C systems performed in a previous study. This paper proposes a Preparation–Decision–Design–Assessment (PDDA) process that focuses on quality oriented development, as a cyclical process to develop the architecture. The PDDA was motivated from the practice of architecture-based development used in software engineering fields. In the preparation step of the PDDA, the architecture of digital-based I&C systems was setup for an architectural goal. Single failure criterion and determinism were setup for architectural drivers. In the decision step, defense-in-depth, diversity, redundancy, and independence were determined as architectural tactics to satisfy the single failure criterion, and sequential execution was determined as a tactic to satisfy the determinism. After determining the tactics, the primitive digital-based I&C architecture was determined. In the design step, 17 systems were selected from the KSNP's I&C systems for the upgrade and functionally grouped based on the primitive architecture. The overall architecture was developed to show the deployment of the systems. The detailed architecture of the safety systems was developed by applying a 2-out-of-3 voting logic, and the detailed architecture of the non-safety systems was developed by hot-standby redundancy. While developing the detailed architecture, three ways of signal transmission were determined with proper rationales: hardwire, datalink, and network. In the assessment step, the required network performance, considering the worst-case of data transmission was calculated: the datalink was required by 120 kbps, the safety network by 5 Mbps, and the non-safety network by 60 Mbps. The architecture covered 17 systems out of 22 KSNP's I&C systems. The architecture is implementable with the equipment developed in South Korea. The architecture can be used as a model to upgrade the existing I&C systems in a planned, large-scale, and one-shot manner. A more detailed architecture down to software level will be developed in the future.     

Photoacoustic spectra of Sb-doped ZnSe

Photoacoustic (PA) spectra were made on Sb-doped ZnSe samples grown by metalorganic vapor phase epitaxy (MOVPE). The samples deposited at a low temperature under irradiation show the PA spectrum with a sharp edge near the band gap and with three distinct peaks. From the Sb flow rate dependence of PA peaks, two of them seem to be related to Sb impurities. Non-doped sample shows only one peak, which is tentatively ascribed to the deep level associated with Se defects.     

高性能结构材料--聚芳硫醚

介绍了聚芳硫醚类高性能结构材料在国内外的研究和发展情况，对几种主要的聚芳硫醚材料品种如聚苯硫醚、聚苯硫醚砜、聚苯硫醚酮、聚苯硫醚酰胺等的合成路线及方法、树脂及复合材料的性能作了详尽的表述，并对该类材料目前存在的问题及今后的发展方向进行了展望。     

PAS网络无线覆盖优化问题探讨

随着PAS网络规模和用户数量的增加，网络优化显得越来越重要。如果实际网络的无线覆盖结果和预期的效果有一定的偏差，就需要对系统网络进行无线覆盖的优化。本主要讨论如何合理分配500mW和10mW基站的位置和数量，通过采用不同类型基站完成对PAS系统无线网络的覆盖优化。     

调度自动化系统PAS高级软件的应用

本文根据哈尔滨地区电网实际应用PAS软件情况综述了其结构、功能 ,提出了该软件的实用性和有待改进与完善的问题     

PAS500在文物展柜净化调湿装置中的应用

本文在简要介绍重庆川仪自动化股份有限公司研制的智能展柜净化调湿装置原理的基础上,阐述用PAS500完成该装置监控功能的实现方法和过程。     

Characterisation of a novel monomeric lectin (AML) from Astragalus membranaceus with anti-proliferative activity

A novel lectin (AML) was isolated from the roots of a Chinese herb Astragalus membranaceus (Fisch.) Bunge, using a combination of ammonium sulphate fractionation and affinity chromatography. AML was found to be a monomeric protein with a molecular mass of 31.5 kDa. Biochemical characterisation revealed that it is a glycoprotein containing 10.7% neutral sugars. The N-terminus of AML was blocked but amino acid sequences of internal tryptic peptides showed moderate sequence identities with some other known lectins. Amongst the various carbohydrates tested, the lectin was best inhibited by d-galactose and its derivatives with pronounced preference for o-nitrophenyl-β-d-galactopyranoside (8.3 mM). The lectin was stable in the pH range of pH 5.0–12.0 and temperatures up to 55 °C for 30 min. AML inhibited the proliferation of HeLa and K562 cell lines. Thus, the lectin displays a high potential for antitumour activity.