超细纤维与超微细工程技术

本文从合成纤维的发展历史出发，讨论了超细纤维产生的必然性，介绍了超细纤维的纤度界限、特性以及与之密切相关的超微细工程技术，并对超细纤维的应用、发展趋势作了述评．     

从舟曲泥石流灾害看我国城镇泥石流防治

2010年8月7日深夜,甘肃省甘南藏族自治州舟曲县县城后山强降雨激发三眼峪和罗家峪同时暴发泥石流.泥石流冲人城区,摧毁房屋,淤埋街道,扫荡其流路上的一切并穿城而过后,直达嘉陵江上游支流白龙江,堵塞河道,形成堰塞湖,使城区三分之一被淹没.舟曲特大泥石流灾害致使1364人遇难,401人失踪,72人受伤.这是一次十分严重的城镇泥石流灾害,也是新中国成立以来破坏性最强、死亡人数最多的一次泥石流灾害.对我国城镇泥石流防治提出了强烈警示!     

谈战略管理会计的本质研究

战略管理会计(Strategic Management Accounting以下简称SMA)是对管理会计的发展,但目前人们对SMA还没有形成统一的认识,许多人虽然对其有所耳闻,但却缺乏一个清晰的理解.     

动态路网环境下的路径优化算法研究

为解决真实动态路网环境下,静态路径优化(static path optimization,SPO)方法和传统动态路径优化(dynamic path optimization,DPO)方法由于频繁实时优化计算,规划路径过程中容易出现绕路、折返、计算复杂度高等问题,提出基于涟漪扩散算法(ripple-spreading algorithm,RSA)的重启协同进化路径优化(restart co-evolutionary path optimization,RCEPO) 方法 。将路径优化过程与路网环境的动态变化过程相结合,提升了路径优化效果。仅当路网环境的动态变化超出预测范围时才进行路径的重新优化计算,降低了计算复杂度。实验结果表明：在动态路网环境下,该方法的实际行进轨迹长度和行进时间相较于传统DPO方法分别缩短了17%和12%。有效解决了真实动态路网环境下路径优化问题。并且通过机器狗实验,验证了该方法的实用性和有效性。     

Microelement analysis of source of raw materials of terracotta warriors and horses of Qin’s Mausoleum in pits No. 1 and No. 2

In order to search for sources of the raw material of the Qin’s terracotta warriors and horses, we selected 20 samples of pottery warriors and pottery horses of the Qin’s Mausoleum from pit No. 1, 19 samples of pottery warriors and brick from pit No. 2, 20 samples of clays near the Qin’s Mausoleum and 2 samples of Yaozhou porcelain bodies. The 32 kinds of element content of each sample were measured by neutron activation analysis (NAA). These data were analyzed by fuzzy cluster analysis, the trend cluster analysis diagram was obtained. The results showed that samples of terracotta warriors and horses from pits No.1 and No. 2 were closely related to the loam layer near Qin’s Mausoleum, but their relations with the loess layers were not so close, and they were out of all relation to Yaozhou porcelain bodies. Thus, it could be deduced that the Li Mountain clay may be considered as the original place of the raw materials of the terracotta warriors and horses, the kiln sites might be located nearby the Qin’s Mausoleum.     

虚拟维修训练系统发展综述及其关键技术探讨

文章述说了虚拟维修训练系统的意义、原理、运用现状、结构级成和关键技术,着重探讨了基于知识和模糊网络的虚拟现实技术在维修训练领域中的运用,对系统中的效果评估子系统检出了一个实用的模糊子集。     

水口水电站运行方式对发电和下游通航影响的试验研究

通过水力模型试验,在几何比尺λ=１００正态整体模型上,研究水口水电站正常运行期一溢流坝不泄洪;和汛期先泄洪后发电或先发电再泄洪时,电站尾水渠及航道段波高、水位涨率、水位涨幅及流速等水力参数,及其对电站７台机组出力（７×２００ＭＷ）、机组稳定和通航的影响．在此基础上提出较为合理的运行方式．