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柴油机油底壳进水的原因及防治措施
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作者 黎清 《拖拉机》 1999年第5期63-63,共1页
柴油机油底壳的液面突然升高,说明有冷却水或者柴油渗入油底壳.这种故障将使油底壳的机油乳化变质,破坏其润滑性能.那么如何判断污染物是水还是柴油呢?可以拧松油底壳的放油螺塞,如果开始流出来的是水;拨出机油标尺能看到水珠,油液呈淡... 柴油机油底壳的液面突然升高,说明有冷却水或者柴油渗入油底壳.这种故障将使油底壳的机油乳化变质,破坏其润滑性能.那么如何判断污染物是水还是柴油呢?可以拧松油底壳的放油螺塞,如果开始流出来的是水;拨出机油标尺能看到水珠,油液呈淡黄色;用纸张抹机油标尺后点燃,如果燃烧过程中发出“噼噼啪啪”的响声,说明机油中已经混入了水分.油底壳进水的具体原因是各式各样的,归纳起来主要有气缸垫漏水、阻水圈损坏、气缸套裂纹以及机件缺陷等4个方面.1 气缸垫漏水由于气缸体、气缸盖与气缸垫之间密封不严所引起,具体原因有: 展开更多
关键词 柴油机 油底壳进水 原因分析 故障排除 气缸垫漏水 阻水圈损坏 机件缺陷
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A Stochastic Model for Optimizing the Patching Time of Software Bugs
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作者 Yong Wang Dianxiang Xu +2 位作者 William M. Lively Dick B. Simmons Zhaohui Wen 《Computer Technology and Application》 2011年第6期432-438,共7页
New bugs and vulnerabilities are discovered and reported from time to time even after software products are released. One of the common ways to handle these bugs is to patch the software. In this paper, the authors pr... New bugs and vulnerabilities are discovered and reported from time to time even after software products are released. One of the common ways to handle these bugs is to patch the software. In this paper, the authors propose a stochastic model for optimizing the patching time for software bugs and vulnerabilities. The optimal patching time can be computed in the patching script development and operational costs in fix. The authors present two case studies using the Nimda worm vulnerability in Microsoft Internet Information Services web server and the bug report of the Debian project. These studies indicate that the patch applications are later than their optimal fix time. 展开更多
关键词 Optimal patching time software systems stochastic renewal model
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