全绝缘母线外绝缘击穿问题分析及改造措施

全绝缘母线在实际运行中经常出现外护层烧毁但主绝缘不受影响的情况,严重影响全绝缘母线的安全运行。通过分析全绝缘母线结构、在现场的安装方式和母线头部及中间开口处绝缘处理情况,发现全绝缘母线结构与单芯电缆结构类似,在屏蔽接地中采用多点接地,母线头部和中间开口处采用热缩材料处理等,进而从材料接地方式分析了全绝缘母线外护层烧毁的原因。并且提出了相应的改造措施,在全绝缘母线屏蔽接地上采用中点接地,在母线头部和中间开口处的绝缘采用冷缩材料处理,进而达到提高全绝缘母线安全运行的效果。     

国产超超临界汽轮机红套环强度分析

综合多年研发汽轮机的经验和当今世界超超临界汽轮机组的结构特点,设计出具有红套环式圆筒型结构的高压内缸。该种结构形式具有高效、可靠、较低转子应力等优点。运行中可以避免缸体扭曲,从而保持平稳和灵活运行。     

子牙新河尾闾段河流特性分析

利用实测水文、泥沙资料 ,对子牙新河尾闾段的河道阻力、冲淤特性、河口水沙及潮汐运动规律进行了全面分析。认识到近年来上游径流减少、河槽萎缩、滩地严重阻水、近海泥沙大量回淤河口及挡潮闸下引河 ,这是目前海河流域入海河流尾闾段普遍存在、影响防洪安全的重要问题。作者对子牙新河尾闾段行洪能力、滩地糙率及引河段淤积态势进行了分析研究 ,提出了利用潮汐动力与工程措施相结合的方法改善尾闾段河道淤积状态 ,提高河口排洪能力。     

超低收缩乙烯基酯树脂的应用

本文介绍了一种超低收缩乙烯基酯树脂及其应用领域，述叙了各类FRP模具的制作以及应用细节。     

预缩砂浆处理裂缝在渔翁埠电站的应用

通过介绍预缩砂浆的性能及配制，说明采用预缩砂浆是一种成本低廉、操作简便、效果良好的修补裂缝的方法。     

Stress-corrosion cracking of reactor feed pump wear rings

Stress-corrosion cracking (SCC) is observed in machine components when an optimal combination of stress levels and environmental conditions is present in susceptible material. An interesting case history of intergranular SCC failure is presented in this paper. This failure occurred in wear rings that were shrink-fitted on the impellers of a multistage horizontal feed pump during the project procurement phase. After manufacture and assembly, two pumps were performance-tested in the supplier's test loop for a combined total of approximately 600 h. The test duration lasted for approximately three months. During this duration, the two pump internals were not absolutely dry and were exposed to an indoor environment in the supplier's test plant. After the completion of the tests, the pump internals were inspected, cleaned, dried, and packaged before air freighting to the reactor site. The pumps were in storage at the site for approximately two months. When the pumps were opened for inspection, two wear rings on each of the pumps were cracked. This paper summarizes the results of the studies to evaluate the root cause of the wear ring failures and the corrective actions implemented to avoid similar failures.     

地下室墙体裂缝原因分析与控制

针对地下室墙体混凝土裂缝比较常见且影响结构使用的问题,总结了地下室墙体混凝土的特点,通过分析地下室裂缝产生的各种原因及影响,总结了防治裂缝产生的具体措施,从而保证了建筑物及构件安全、稳定地工作.     

混凝土收缩徐变对拓宽拼接T梁桥内力的影响

介绍了目前拓宽桥梁新旧梁拼接构造的方法,主要分析了新旧主梁收缩徐变差异产生的附加力在新旧主梁及新旧主梁连接面上的分布及其影响,提出了提高新旧混凝土连接面抗剪能力的措施,以达到防止裂缝产生的目的.     

浅析空心板桥梁裂缝成因与预防措施

指出裂缝是桥梁工程中经常遇到的问题,各种各样的裂缝对桥梁结构的安全性、稳定性构成潜在威胁,通过分析各种裂缝的种类及成因,给出相应的预防措施,防患于未然,避免工程中出现危害较大的裂缝,并为空心板的设计、施工提供可借鉴的经验。     

Polysiloxane Softener Coatings on Plasma‐Treated Wool: Study of the Surface Interactions

Low temperature plasma (LTP) improves the shrink‐resistance of wool fabrics but impairs their softness, so different polysiloxane coatings were applied. Modifications in surface hydrophilicity and topography of fabrics and fibres have been recorded through drop test, contact angle and SEM, respectively. LTP improves the deposition of the polysiloxanes which, depending on their functionalities alter the original hydrophilicity of the wool surface. Softness and shrink‐resist results of the fabrics point out to a possible relationship between hydrophilicity of the wool fibre surface and the shrinkage behaviour of the fabrics. A possible mechanism of interaction between the different polysiloxane groups and the surface of untreated (UT) and LTP‐treated wool is proposed.