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目前嵌入式文件系统的可靠性是嵌入式系统开发中较为重要的环节,然而其设计与开发往往受限于其严格的内存、处理器、以及I/O的限制,而且一些额外的复杂性管理与磁盘的延迟都会直接影响嵌入式文件系统的性能.为了提高系统的稳定性与可靠性,本文提出了一种基于嵌入式Ext2文件系统同步与异步I/O并存的媒体文件快照存储系统(MSFS),其主要技术是MSnap(媒体数据虚拟视图快照技术).不同于其他的快照技术,这种技术不需要大容量的快照数据卷以及复杂的操作就能够很好的提供文件系统的可靠性与稳定性.文章的最后给出了该技术应用后与传统操作系统的实验数据对比情况. 相似文献
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The melt filling difficulty in micro cavity is one of the main challenges for micro-injection molding (MIM). An approach employing
ultrasound in MIM was proposed. The approach was extensively studied through experiments with a home-made experimental ultrasonic
plastification device. The results of the experiments show that polymer ultrasonic plastification speed increases with ultrasonic
supply voltage and plastification pressure. When the ultrasonic supply voltage is 200 V and the plastification pressure is
2.0 MPa, the polymer ultrasonic plastification speed reaches the maximum value of 0.111 1 g/s. The results also indicate that
the ultrasonic cavitation effect is the most significant effect of all the three effects during polymer ultrasonic plastification
process. 相似文献
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高层建筑施工过程中的质量控制与安全管理 总被引:1,自引:0,他引:1
高层建筑施工过程中的质量控制主要包括:强度控制、三线控制;安全管理主要包括:基坑支护、脚手架、模板工程、施工用电等方面的管理。高层建筑因其显著特性是"高",从而引发出诸多不同于其它建筑的特点来。 相似文献
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为调控大型飞机用铝合金结构件的组织均匀性,提出表层增塑累积变形的方法。采用电子背散射衍射、透射电子显微镜和X射线衍射技术研究7050铝合金锻件表层增塑累积变形后的显微组织。结果表明,7050铝合金锻件的显微组织演变对变形温度比应变速率更敏感。锻件的位错密度随着变形温度的降低和应变速率的增加而持续增加。通过表层增塑累积变形实现位错密度和形变储能的高效累积。此外,建立7050铝合金的静态再结晶模型,计算得到的静态再结晶体积分数与实验结果吻合较好,说明该模型能够准确地描述7050铝合金在表层增塑累积变形调控中的静态再结晶行为。 相似文献
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乙醇汽油的生产与应用 总被引:5,自引:0,他引:5
燃料乙醇是一种环境友好的可再生替代能源,可按一定的比例与汽油组分掺混成乙醇汽油。介绍了乙醇汽油的生产技术、应用现状和发展前景。 相似文献
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Analysis of isothermal forging process and mechanical properties of complex aluminum forging for aviation 总被引:1,自引:0,他引:1
Large complex 7A85 aluminum wing-body joint was forged employing isothermal forging process and its mechanical properties were studied.The tensile strength after forging is up to 587.5 MPa in longitudinal direction,15% higher than that using free forging.Moreover,the tensile strength of the forging is almost the same in three directions.Isothermal forging also performs well on overall fracture toughness,with a maximum value of 39.8 MPa·m1/2,and that of short transverse direction all reaches 36 MPa·m1/2 and above,with a maximum relative error of only 3.6%.The results indicate that the isothermal forging leads to better performance as well as higher uniformity in mechanical properties. 相似文献