白口铸铁碳化物的团球化

综述了白口铸铁中碳化物孤立化乃致团球化的几种基本方法，即合金化、变质处理、热处理、控制夹杂物形态以及锻造强韧化等。     

Preparation of silicon‐/phosphorous‐containing epoxy resins from the fusion process to bring a synergistic effect on improving the resins' thermal stability and flame retardancy

Epoxy resins containing both phosphorous and silicon were prepared via the fusion process of reacting a phosphorous diol and a silicon diol with a bisphenol‐A‐type epoxy. With various feeding ratios of the reactants, epoxy resins with different phosphorous and silicon contents were obtained. Through curing the epoxies with diaminodiphenylmethane, the cured epoxy resins exhibit tailored glass transition temperatures (159–77°C), good thermal stability (>320°C), and high char yields at 700°C under air atmosphere. The high char yield was demonstrated to come from the synergistic effect of phosphorous and silicon, where phosphorous enriches char formation and silicon protects the char from thermal degradation. Moreover, high flame retardancy of the epoxy resins was found by the high LOI value of 42.5. The relationship of the char yields at 700°C under air atmosphere (ρ) and the LOI values of the epoxy resins could be expressed as LOI = 0.62ρ + 19.2. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 404–411, 2003     

500kV隔离刀闸操作故障的分析

1　故障概况　　 (1 )上河变主接线图 (如图 1 )图 1　淮阴上河变 5 0 0 k V部分主接线图(2 ) 2 0 0 0年 2月 2 0日 ,52 34堡上 线由冷备用转热备用 :当时 50 53开关运行 ,52 4 2线运行 ,50 51 1、 50 51 2、 50 531、 50 532刀闸在合位 ,50 52 1刀闸在分位 ,当 50 52 2刀闸由分位进行合闸 ,动静触头相距约 30 cm时 ,端子箱内 A相操作熔丝 (2 0 A)熔断 ,动静触头间拉弧达 30 min。(3) 2 0 0 0年 2月 2 2日 ,50 52开关由冷备用转运行 :当时 50 53、50 51开关运行 ,52 34、52 4 2线运行 ,50 51 1、50 51 2、50 531、50 532刀闸在合位 ,50 5…     

Thermal degradation and flammability of P/Si polysilsesquioxane epoxy nanocomposites

A thermal stable epoxy nanocomposite prepared from the 4,4′‐diglycidylether bisphenol A (DGEBA) and the P/Si ladder‐like polysilsesquioxane (PSSQ). The activation energies of thermal degradation were calculated by Kissinger's and Ozawa's methods. The higher ladder‐like PSSQ content not only increase the oligomer content but also generate the steric hindrance. Which steric hindrance influence the epoxy/amine curing reaction of the modified epoxy system was more than the pristine DGEBA epoxy system. The P‐Si synergistic effect on the thermal stability of the nanocomposites was discussed. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

寒区保温装饰复合板传湿设计对耐久性能的影响分析

通过分析黑龙江省建筑市场目前常用的保温装饰一体板保温层和装饰防护层透湿性能,指导生产厂家如何利用试验数据确保一体板的应用安全,指出相当一部分一体板透湿性能无法满足冬季围护结构顺利排湿,必须设置排湿构造或隔汽层。通过分析对比指出目前保温装饰复合板标准规定的不合理性,以及目前标准规范提供的数据中新材料蒸汽透过性能及热工性能数据的缺乏,使一些设计中应该进行的防潮冷凝验算时无法进行,呼吁研究部门及时进行基础数据的补充。     

Assessment of polyester and polyvinylester coatings in a simulated FGD scrubbing liquid with EIS

Abstract

Corrosion behaviours of carbon steel coated with polyester and polyvinylester in a simulated flue gas desulphurisation (FGD) fluid (i.e., a mixture of H₂SO₄ and 0.1 wt% Fe₂(SO₄)₃ at pH=2) have been investigated with electrochemical impedance spectroscopy (EIS). The protective nature of the coatings at 25°C has been observed in the following order: polyvinylester primer >> polyvinylester topcoat > polyester topcoat > polyester primer. Coating deterioration occurred and the coating deterioration rate accelerated with increasing temperatures upto 85°C. However, the corrosion resistance sequence has remained the same. Equivalent circuits are suggested for various coatings to discuss their mechanisms in this work.     

华能北京热电厂进口给水泵组控制系统改进

介绍大型热电厂电动调速给水泵组控制系统的结构、功能，并针对投运后出现的问题逐一进行了改进，确保了机组的安全运行。     

全井眼流量计在塔河油田的应用研究

全井眼流量计是一种采用可伸缩金属叶片的涡轮流量计,具有叶轮面积大,坚固耐用的特点,仪器本身带扶正机构,居中性好。仪器下井过程中在经过油管时,叶片自动收缩,进入套管后又自动张开,不影响仪器的起下,经过在塔河油田几个油田的测试应用证明,该仪器很好地解决了高产井、稠油井流量测试难的问题。     

Effects of preparation methods for V<Subscript>2</Subscript>O<Subscript>5</Subscript>-TiO<Subscript>2</Subscript> aerogel catalysts on the selective catalytic reduction of NO with NH<Subscript>3</Subscript>

A series of V₂O₅-TiO₂ aerogel catalysts were prepared by the sol-gel method with subsequent supercritical drying with CO₂. The main variables in the sol-gel method were the amounts of V₂O₅ and when the vanadium precursor was introduced. V₂O₅-TiO₂ xerogel and V₂O₅/TiO₂ (P-25) were also prepared for comparison. The V₂O₅-TiO₂ aerogel catalysts showed much higher surface areas and total pore volumes than V₂O₅-TiO₂ xerogel and impregnated V₂O₅/TiO₂ (P-25) catalysts. The catalysts were characterized by N₂ physisorption, X-ray diffraction (XRD), FT-Raman spectroscopy, temperature-programmed reduction with H₂ (H₂-TPR), and temperature-programmed desorption of ammonia (NH₃-TPD). The selective catalytic reduction of NOx with ammonia in the presence of excess O₂ was studied over these catalysts. Among various V₂O₅-TiO₂ catalysts, V₂O₅ supported on aerogel TiO₂ showed a wide temperature window exhibiting high NOx conversions. This superior catalytic activity is closely related to the large amounts of strong acidic sites as well as the surface vanadium species with characteristics such as easy reducibility and monomeric and polymeric vanadia surface species. This work was presented at the 7 ^th Korea-China Workshop on Clean Energy Technology held at Taiyuan, Shanxi, China, June 26–28, 2008.