一种抗蛇行减振器控制系统在高速动车组中的仿真应用

为协调车辆横向稳定性与曲线通过性之间的矛盾,提出一种抗蛇行减振器的控制系统,并采用ADAMS Matlab联合仿真的方法在高速动车组中进行了仿真应用。该控制系统以车体两侧高度差为控制变量,该变量可由空气弹簧高度调节阀和压差阀直接提供,不需要额外的传感器。抗蛇行减振器的控制系统可实现对曲线轨道和直线轨道两种情况之间抗蛇行减振器阻尼系数大小的调节。仿真结果表明：抗蛇行半主动控制在不影响动车组横向稳定性的同时,可大大提高车辆曲线通过时的安全性能。     

拟史:宋元讲史平话的叙事策略

因为题材的客观要求和创作者的有意仿效,讲史平话的叙事特征不同于一般的小说话本,带有明显的"拟史"倾向.讲史平话在叙事时间和叙事结构的处理上,存在对传统史书的借鉴.通过与小说话本和史书的双重比较,可以看出讲史平话的叙事手法在遵循说话艺术线索清晰、细节丰富的同时,也较多运用了史书纪传体和编年体的结构形式.     

“写作即翻译”与同伴反馈法结合之实证研究

同伴反馈法在英语写作教学中有着不可替代的作用,但是自身也有其局限性,为了弥补其重技巧、轻能力、指导性的不足,本文基于"同伴反馈"与"写作即翻译"教学法的结合,对学生进行了一次系统的问卷调查,并通过定量统计与定性分析,以期从现象与本质两方面了解学生对两种教学法结合的态度。结论表明:总体上学生对该教学手段持肯定态度,部分学生提出了建议,少数学生持否定或中立态度。此实验为本教学法的后期改进与完善提供了理论与数据上的参考。     

日本的中国词学研究及新进展

中国的词，早在唐代就传到了日本。弘仁十四年（823），日本嵯峨天皇、有智子内亲王和滋野贞主就有模仿追和之作。但日本关于中国词的研究，起步较晚。明治时期的森川竹蹊，是日本较早研究词学的专家。森川竹磺编著的《鸥梦吟社丛书》收录有中国词话著作七种，并予标点注释，这比唐圭璋先生编的《词话丛编》要早出版二十多年，比1921年况周颐和王文濡编印的《词话丛抄》也要早十来年。日本的词学研究，跟研究小说和诗歌的学者相比，人数较少，知道词的人也不多。近十五年来，研究词的学者逐渐增多，论著也增加了不少。村上哲见先生的《宋词研究——南宋篇》最具代表性。     

超硬高速钢车刀快速加工多线蜗杆方法研究

结合多年的教学实践,对超硬高速钢车刀快速加工多线蜗杆的方法进行了研究。阐述了加工步骤、刀具选用和加工时的注意事项。解决了多线螺线分线方法问题,较好地保证了加工精度。     

恒压供水中水泵调速控制的节能分析

阐述了水泵调速控制的节能原理,首先介绍了水泵的节流调节控制流量的方法,然后分析了水泵的转速与各种性能参数的关系,进而研究水泵的调速调节控制流量的方法,将两种控制流量的方法作了对比,分析了调速调节比节流调节节能的原因,最后简要的介绍了变频调速恒压供水系统。     

不同驱动与控制下的战略变化速度与幅度研究

本文整合已有的对战略变化驱动的研究并引入控制机制,采用多行业的大样本数据实证分析检验了外部竞争环境驱动和内部组织因素驱动对于管理者控制方式选择的影响,对于战略变化过程中速度和幅度两个基本特征的影响,以及战略控制和财务控制两种不同控制方式对于战略变化过程的影响。     

Spatial–temporal model for wind speed in Lithuania

In this paper, we propose a spatial–temporal model for the wind speed (WS). We first estimate the model at the single spatial meteorological station independently on spatial correlations. The temporal model contains seasonality, a higher-order autoregressive component and a variance describing the remaining heteroskedesticity in residuals. We then model spatial dependencies by a Gaussian random field. The model is estimated on daily WS records from 18 meteorological stations in Lithuania. The validation procedure based on out-of-sample observations shows that the proposed model is reliable and can be used for various practical applications.     

Social acceleration and the network effect: a defence of social ‘science fiction’ and network determinism

This essay is a response to Judy Wajcman's essay ‘Life in the fast lane? Towards a sociology of technology and time’ (2008: 59–77). In that article Wajcman argued that recent developments in the sociology of temporal change had been marked by a tendency in social theory towards a form of ‘science fiction’– a sociological theorizing, she maintains, that bears no real relation to actual, empirically provable developments in the field and should therefore be viewed as not contributing to ‘a richer analysis of the relationship between technology and time’ (2008: 61). This reply argues that as Wajcman suggests in her essay, there is indeed an ‘urgent need for increased dialogue to connect social theory with detailed empirical studies’ (2008: 59) but that the most fruitful way to proceed would not be through a constraining of ‘science fiction’ social theorizing but, rather, through its expansion – and more, that ‘science fiction’ should take the lead in the process. This essay suggests that the connection between social theory and empirical studies would be strengthened by a wider understanding of the function of knowledge and research in the context of what is termed ‘true originality’ and ‘routine originality’. The former is the domain of social theory and the latter resides within traditional sociological disciplines. It is argued that both need each other to advance our understanding of society, especially in the context of the fast‐changing processes of technological development. The example of ‘technological determinism’ is discussed as illustrative of how ‘routine originality’ can harden into dogma without the application of ‘true originality’ to continually question (sometimes through ideas that may appear to border on ‘science fiction’) comfortable assumptions that may have become ‘routine’ and shorn of their initial ‘originality’.     

探头式电磁流量计的理论研究和样机试验

本文分析了探头式电磁流量计的基本原理。根据电磁学和流体力学的理论求得了圆柱二电极、圆柱四电极、椭圆柱以及流线型柱体探头感应电动势的解析解。文中还讨论了边界层绕流圆柱探头和有限区间对探头输出信号的影响。从理论解可以看出,探头电极间的感应电动势与来流速度之间呈明显的线性关系。此外,文中还推荐了几种延迟或避免探头表面发生边界层分离的方法。对于圆柱和椭圆柱样机的实验证实了理论分析的结果。