计算数学在高职计算机专业教学中的作用

计算数学从一种纯数学的计算方法研究渐渐形成了当今的科学与工程计算、计算机数值实验与模拟的方法、理论研究的一个复杂的系统工程。在高职计算机专业教学中要渗透计算数学的常用思想与方法,包括递推法、迭代法、切线逼近法、累加法等。     

结构方程模型在英语阅读语料库中的研究

该文从建立基础型英语阅读语料库(English Reading Corpus,ERC),然后采用结构方程模型(Structural EquationModeling,SEM)及语言统计学方法,从英语阅读语料库的语篇复杂度、学习者个体的信息获取水平及情感因素三方面进行了建模及相关关系的探索性研究,在数据统计和分析的基础上,找到了满足置信度及可拟合的数学模型,以期能对英语阅读教学和学习有所启示。在通过对SEM的ERC建模之后的数据进行全面、准确的统计分析,能够为提高英语阅读教学质量提供有价值的统计数据和分析资料。     

暗穿隧道下穿铁路专运线沉降分析

西安地铁半坡站出入口暗挖隧道下穿纺织城铁路专线,设计采用桩基础进行轨道加固。应用计算软件,通过铁路专运线在加固前后,受下穿暗挖隧道施工影响所产生的沉降大小的数值计算分析,讨论加固措施的必要性和可行性。     

基于云计算和空中校园的高等教育发展趋势——兼论我国广播电视大学系统的未来作用

美国高教信息化2009年会提出未来高等教育的趋势之一是基于云计算的空中校园,这一趋势不仅把目前最先进和最适用于教育的信息技术整合起来发挥综合作用,而且将从教学、科研方式和评价机制等方面影响未来高等教育战略走向,具有技术革命的色彩。对比我国发展广播电视大学和美国推广空中校园这两种教育发展战略,既有技术层次、形成机制上的区别,也有基本理念、社会需求方面的相似性。为了应对新的技术挑战,有必要考察、分析基于云计算的空中校园这一未来高教信息化发展趋势,并总结、分析我国既有经验和基础,以利于更好地消化先进教育理念、促进适合我国国情的教育改革。     

多核嵌入式系统软件开发方法的研究

探讨了多核嵌入式系统下程序开发的方法,对实时任务进行基于功能和数据的划分,充分利用多核的资源,从而提高实时任务的性能。通过比较划分前后程序在多核上运行的性能,总结出合理的、可以提高实时任务性能的程序开发方法。     

“N＋I”模式提高高职数控专业学生实践技能的研究

针对当前高职数控专业学生的实践技能水平现状及存在的问题进行了深入分析．结合南京工业职业技术学院数控专业学生“校企合作、生产性实训”制度。提出了基于企业需求的“N＋I”学生实践技能培养模式．该模式以学生为主导．以企业产品为载体．使学生的实践与企业生产无缝化对接．效果显著。     

大直径现浇砼薄壁筒桩在复合地基中的探讨

简单介绍大直径现浇薄壁筒桩技术在某深厚软土复合地基中计算理论以及设计。提供了筒桩地基处理的常用断面,传递机理和承载力计算方法和沉降计算方法。并提出筒桩复合地基稳定性分析中的不足和可用的分析方法。最后,通过分析比较了不同直桩型地基处理的经济与技术指标,论证该桩型在沿海软土地基处理中具有广泛的推广价值。     

对汽轮发电机组突发性振动处理的几点思考

汽轮发电机组突然性振动的处理是目前发电厂常见的复杂而困难的工作,现参阅相关文献谈谈振动的现象和特征、确定标准和原因分析等的思考。     

Comparison of numerical and analytical solutions for fly casting dynamics

This paper presents an approximate analytical model of the dynamics of a tapered fly line during a standard overhead cast. During casting, the line forms a nonlinear propagating wave that is frequently referred to as a ‘loop’ by fly casters. The geometry of the loop is described by three distinct parts: a straight bottom segment (attached to a stationary fly rod), a semi-circular segment that is propagating (i.e. the loop), and a straight top segment that is also propagating, (i.e. the traveling line). A fly (particle) is attached at the end of the traveling line. A work-energy balance yields the velocity of the fly as a function of the length of the traveling line. For a uniform fly line (level line), a closed-form solution is found, while for a tapered fly line, the solution is obtained by quadrature. A critical loop diameter arises in the analysis, and it determines whether the final velocity of the fly is greater or lesser than the initial velocity of the traveling line. The analytical solutions are critically compared against numerical solutions of a general model for fly line dynamics that relaxes many of the assumptions employed in the analytical model. The agreement between the two solutions remains close during the loop propagation phase, provided a significant amount of fly line remains in the traveling line. However, as the traveling line vanishes and the loop ‘turns over’, the two solutions diverge abruptly due to the many simplifying assumptions employed in the analytical model.     

A hybrid numerical method to develop America’s Cup yacht appendages

A method aimed at the development of an America’s Cup racing yacht bulb is developed and validated against experimental data. The method relies heavily on Reynolds Averaged Navier Stokes computational fluid dynamics (CFD) and also factors in gravitational and aerodynamics effects through the use of a Velocity Prediction Program. Initial extensive use of towing tank results is made to be able to validate the CFD solution and thus develop a solid ground for predictive work. Then, in order to narrow down the focus on bulb developments, decoupled hypotheses are made on the influence of the hull and free surface wave. The development of a detailed performance analysis chart of a known base bulb allows the use of a relatively small series of CFD simulations together with physical hypotheses to assess any given bulb performance relative to the known base. The discussion of the results on a specific development highlights the promises and limitations of the method; final full scale results are discussed and analysed as well.