排序方式: 共有12条查询结果,搜索用时 31 毫秒
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随着集团产品研发中仿真计算规模与计算量的不断扩大,普通计算机已无法满足计算要求。为满足各企业对高速计算的需求,集团研发中心建设高性能计算中心,为企业技术研发提供计算服务,对推动技术创新发展具有重要意义。针对高性能计算中心的系统架构、数据安全以及系统搭建过程进行了介绍,最后对所搭建高性能计算系统进行了并行效率测试与分析,实践证明,该高性能计算系统在计算性能、系统安全与稳定性方面均达到设计要求。 相似文献
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针对污水厂进水碳源不足的问题,采用南方某污水厂剩余污泥进行碱性发酵实验,系统考察了产酸量、氨氮和总磷释放量,研究微生物对发酵液的利用以及污泥脱水情况。结果表明:在pH值=10、25℃条件下,发酵第7天,挥发性有机酸含量达到峰值3 262 mg/L,其中乙酸积累量占比76.52%。采用发酵液作为原料,微生物反硝化过程、硝化过程、厌氧释磷过程均不受影响。在pH值为4的条件下,聚合硫酸铁投加量(以干基计)为70 kg/t时,发酵污泥含水率可降至64.02%。污泥碱性发酵后可产生大量脂肪酸,且发酵液中的有机物组分能作为微生物需要的反硝化碳源,对硝化过程、磷的释放均未产生明显不利影响,发酵产生的污泥经过聚合硫酸铁调理后脱水性能良好。 相似文献
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The flow stress feature and microstructure evolvement of a commercial pure aluminum were investigated by compression on Gleeble-1500 dynamic materials test machine. Optical microscopy (OM) and transmission electron microscopy (TEM) were applied to analyze the deformation microstructure of the commercial pure aluminum.The results show that the flow stress tends to be constant after a peak value and the dynamic recovery occurs when the deformation temperatures is 220℃ with the strain rate of 0.01 s^-1; while the dynamic recrystallization occurs when the deformation temperature is higher than 380℃ and the flow stress exhibits a single peak at 460 ℃with different strain rates from 0.001 s^1 to 1 s^-1, and continuous dynamic recrystallization and geometric dynamic recrystallization occur during the hot compression of the commercial pure aluminum. 相似文献
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采用拉伸实验、硬度及电阻率测试、动态机械热分析、显微组织观察等方法研究了退火及时效对挤压态AZ61合金力学性能及阻尼性能的影响。结果表明:未经均匀化处理的AZ61合金热挤压后再经过退火(573K×1h),抗拉强度几乎不变;固溶处理(693K×1h)使合金的应变无关阻尼降低,但使应变相关阻尼提高。固溶处理后的时效(453K×24h)由于有少量第二相析出,明显提高合金的屈强比,且因增加了合金基体中强钉扎点的数量使阻尼性能较固溶处理后的稍有降低。该合金室温阻尼可用G-L位错钉扎模型解释。 相似文献
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热处理对挤压态AZ61合金力学性能和阻尼性能的影响 总被引:5,自引:0,他引:5
采用拉伸实验、硬度及电阻率测试、动态机械热分析、显微组织观察等方法研究了退火及时效对挤压态AZ61合金力学性能及阻尼性能的影响.结果表明未经均匀化处理的AZ61合金热挤压后再经过退火(573 K×1 h),抗拉强度几乎不变;固溶处理(693K×1h)使合金的应变无关阻尼降低,但使应变相关阻尼提高.固溶处理后的时效(453 K×24h)由于有少量第二相析出,明显提高合金的屈强比,且因增加了合金基体中强钉扎点的数量使阻尼性能较固溶处理后的稍有降低.该合金室温阻尼可用G-L位错钉扎模型解释. 相似文献
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镁及镁合金动态再结晶研究进展 总被引:34,自引:4,他引:34
综述了镁及镁合金动态再结晶方面的研究现状,介绍了镁及镁合金室温或高温塑性变形行为,包括应力一应变特征及其影响因素、应变速率方程和流变应力方程;描述了该合金在不同变形条件下发生塑性变形时的位错、孪晶、亚结构等微观组织演变以及各种动态再结晶如孪生动态再结晶、低温动态再结晶、连续动态再结晶、不连续动态再结晶和旋转动态再结晶的机理及其特点;最后讨论了动态再结晶与塑性变形之间的相互关系,并提出了镁及镁合金动态再结晶研究的发展趋势。 相似文献
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Strain amplitude dependence of the logarithmic decrement was measured and studied on an AZ61 magnesium alloy at room temperature. Measurements were carried out before and after isochronal thermal treatment step by step with increasing temperature. For all specimens, the strain dependence of the logarithmic decrement exhibits two regions. At lower strains the logarithmic decrement is strain independent and in the higher strain region it depends strongly on strain amplitude. The strain-independent logarithmic decrement is mainly composed of thermoelastic damping and dislocation damping, which can be explained by Granato-Lücke theory. In addition, the strain-independent logarithmic decrement for the specimens annealed at higher temperatures is a little lower than that for as-cast specimen, and it increases with increasing temperature of heat treatment. Microstructure changes due to heat treatment are responsible for changes of the logarithmic decrement. 相似文献
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