连续退火工艺对电镀锡板组织和性能的影响

利用连续退火试验机研究了连续退火工艺对电镀锡板组织和性能的影响.结果表明,在660 ～ 740℃退火温度范围内,随退火温度升高,晶粒尺寸逐渐增大,硬度降低.以24℃/s加热速率升温时,在达到700℃退火温度前,再结晶过程已基本完成,且退火5s后,继续延长退火时间至45 s过程中晶粒长大速率减缓,硬度变化不明显.过时效处理对电镀锡板力学性能有较大影响.随过时效开始温度的变化,固溶强化和析出强化呈相互竞争关系.过时效开始温度由480℃降低到350℃过程中,钢板的硬度和强度呈现先减小后增大的趋势,伸长率在过时效开始温度为400℃时开始降低.纳米级的Fe3C伴随过时效开始温度的降低而大量析出,且弥散分布在铁素体基体内,对钢板的强度有较大影响.     

特性列举法在空调设计中的研究与应用

特性列举法作为非常有效的创造技法之一,在目前的产品设计中并没有被深入发掘与利用.针对特性分析表面化的现象,分别对产品的3种特性进行了详细归类与深人分析,在名词属性中强调细节以及相关度,把形容词属性细分为性质属性与状态属性,动词属性分为使用功能与使用动作.以立式空调为对象,围绕其3种特性进行设计分析与设计展开,使设计在造...     

A pseudo-transient heat transfer simulation of a continuous casting process,employing the element-free Galerkin method

The present work has been conducted in order to develop a novel solution for the heat transfer problem during the continuous casting of steel billets and blooms, by using the element-free Galerkin method under a pseudo-transient moving cross-section slice approach. The transport laws, non-linear aspects and boundary conditions of the initial value problem have been specified. A detailed explanation concerning the characteristics inherent to the application of the element-free Galerkin method to this problem has also been provided. The feasibility and suitability of this novel approach has been verified by comparison with the numerical techniques proposed and the results reported by other researchers as well as an analytical solution of a simple 1-D alloy solidification problem. The results have revealed that this technique could be used successfully in the pseudo transient moving cross-section solution of the heat transfer problem involved in the continuous casting of blooms and square billets.     

某高速匝道独柱墩连续箱梁桥横向抗倾覆稳定性分析

针对独柱墩连续箱梁桥在汽车超载或偏载作用下横向易失稳的问题，总结了横向失稳坍塌的过程，分析了其失稳机理，然后阐述了独柱墩桥横向失稳的判别准则和计算方法，并对某高速匝道独柱墩连续箱梁桥进行分析，验算了其横向倾覆安全系数、支座脱空和支座转角，验算结果表明其横向倾覆稳定性满足安全运营的要求。     

关于高科技企业人才战略的思考

从高科技企业人力资源要素所具有的特性出发，对高科技人才的激励、团队建设、可持续发展的人才战略制定的几个尚无定论问题发表了自己的看法。     

Mann and Ishikawa iterations with errors for non-lipschitzian mappings in Banach spaces

Let C be a nonempty closed convex subset of a uniformly convex Banach space and let T : C → C be completely continuous asymptotically nonexpansive in the intermediate sense. In this paper, we prove that the Ishikawa (and Mann) iteration process with errors converges strongly to some fixed point of T, which generalizes the recent results due to Huang [1].     

多点矫直设计计算

分析采用多点矫直法，合理控制应变分配及应变速率，提高连铸坯质量的基本原理。介绍矫直点数N、曲率半径圮、矫直应变蜀和应变速率计算方法。     

板坯连铸机气雾冷却主管压力控制

板坯连铸气雾冷却主管压力的串级控制是解决气雾冷却控制系统稳定运动的十分有效的控制方式。     

铸坯质量改进与设备功能恢复

天津钢管公司炼钢厂在设计期间,为连铸设备设计了一套连铸坯计算机质量跟踪系统,该系统能够在线监控连铸坯的质量状况,用于指导生产和检验。本文详细介绍了此系统的各项功能及其使用方法,阐述了恢复使用此项功能所要解决的问题,以及给公司所带来的利益。