Dynamic recrystallization behavior of 35CrMo structural steel

The dynamic recrystallization behavior of 35CrMo steel was studied with compression test in the temperature range of 1 223 1 423 K and the strain rate range of 0.01 10.00 s -1 . The initiation and evolution of dynamic recrystallization were investigated with microstructure analysis and then the critical strain ε c for dynamic recrystallization initiation, the strain for maximum softening rate ε * and the steady strain ε s were obtained to be 2.92×10 -3 Z 0.1381 , 1.60×10 -3 Z 0.178 0 and 3.26×10 -2 × Z 0.097 2 respectively by analysis of work hardening rate strain θ ε curves, where Z is the Zener Hollomon parameter. The dynamic recrystallization fraction was determined using recrystallization theory, and the effects of initial grain size, strain rate and deformated temperature on the dynamic recrystallization kinetics were investigated. The results show: X DRX =1- exp(-3.23( ε-ε cε s-ε c ) 2.28 ), the dynamic recrystallization fraction is slightly delayed due to the somewhat larger initial grain size and markedly delayed with the decrease of temperature. On the other hand, it is significantly accelerated with the increase of the strain rate. Finally, the relationships between the initiation time, ending time of dynamic recrystallization and the deformed temperature were analyzed in detail.

网格网络传输性能优化方法

TCP协议广泛应用于可靠的端到端的拥塞控制网络通信,也是应用于几乎所有分布式计算网络的协议。随着网格技术的发展,广域网的性能成为其中关键的组成部分,但操作系统中与TCP相关的协议栈仍然仅适用于昨天的网络速度,很多高性能的网格只使用了带宽的一小部分。先介绍了一些优化网络性能的调节缓冲区大小的方法并讨论了它们的特点,最后详细说明一个合理可行的网格通用传输机制。

跨国公司直接投资区位选择的博弈分析

本文运用经济学、博弈论等有关原理,推导出了在完全信息动态博弈下的跨国公司直接投资区位选择模型。该模型主要分析了市场容量、东道国税率、知识产权保护力度等因素对跨国公司直接投资区位选择的影响。最后,对我国政府在如何制定政策吸引外商直接投资方面给出了建议。