三维空间中Euler方程的有限差分方法     

郑治波  赵文燕 《保山学院学报》2013,(5):13-16

研究三维Euler方程具有非常重要的意义,但是我们很难求得此方程的精确解,目前就理论上做了少量工作,构造了部分精确解,主要构造Euler方程的数值解为现实生活提供一些信息;因此,将从数值解入手,研究三维Euler方程向后差分格式和Lax-Friedrichs格式的解及精确解,利用MATLAB程序做差分解和误差的图像,同时讨论他们的解的优缺点.  相似文献   

撰写英语学士学位论文应注意的问题     

郑恩岳 《浙江教育学院学报》2003,(1):94-98

英语专业本科毕业生撰写学士学位论时，往往在论格式和字表达方面存在较大的问题。在对此进行分析的基础上，提出了改进意见，以期提高论质量，顺利通过论答辩。  相似文献   

How to improve statistical thinking: Choose the task representation wisely and learn by doing     

Sedlmeier  Peter 《Instructional Science》2000,28(3):227-262

Attempts to teach statistical thinking usingcorrective feedback or a rule-training approach havebeen only moderately successful. A new trainingapproach is proposed which relies on the assumptionthat the human mind is naturally equipped to solvemany statistical tasks in which the relevantinformation is presented in terms of absolutefrequencies instead of probabilities. In aninvestigation of this approach, people were trained tosolve tasks involving conjunctive and conditionalprobabilities using a frequency grid to representprobability information. It is suggested that learningby doing, whose importance was largely neglected inprior training studies, has played a major role in thecurrent training. Study 1 showed that training thatcombines external pictorial representations andlearning by doing has a large and lasting effect onhow well people can solve conjunctive probabilitytasks. A ceiling effect prevented comparison of thefrequency grid and a conventional pictorialrepresentation (Venn diagrams) with respect toeffectiveness. However, the grid representation wasfound to be more effective in Study 2, which dealtwith the more difficult topic of conditionalprobabilities. These results suggest methods tooptimize the teaching of statistical thinking and thepresentation of statistical information in themedia.  相似文献   

易格式可执行文件脱壳方法论述     

孟宪伟  葛星 《鸡西大学学报》2005,5(2):43-45

经过汇编级动态调试分析，设计出的针对一种特殊的以PE文件为载体的可执行文件“易格式可执行文件”的通用脱壳方法。  相似文献   

现代汉语“整个一个X”格式考察     

袁丽 《郧阳师范高等专科学校学报》2007,27(2):53-58

“整个一个X”格式是现代汉语中比较特殊的一种格式。人们对它至今关注较少。文章着重对“整个一个X”格式的构成形式、语义特征及其语用价值等进行一系列分析和探讨。并对这一研究中仍存在的问题提出了一些个人见解。  相似文献   

异构数据库更新同步研究与实现     

肖刚 《教育技术导刊》2019,18(10):182-185

数据库同步是实现不同系统之间数据共享的有效方法。现有异构数据库同步模型能有效解决记录的同步新增,但由于同步记录查询基于数据表名和关键字值,若不考虑同步数据库节点变化,将导致数据库不适用于某些遗留系统。针对该问题,提出同步控制和主从记录映射方法,在同步控制层记录主从记录映射关系。在采用双向中间件方法的同步技术基础上,设计基于标准数据格式的数据转换,降低数据转换模块开发维护成本,并根据模型应用WCF框架实现系统。实践应用表明,该模型可实现异构数库之间同步更新。  相似文献   

一些足以破解疑古思想的论述——现代学者关于古代书体书例的总结     

张京华 《湘南学院学报》2006,27(6):31-34

自从20世纪初顾颉刚等首倡“疑古辨伪”以来,学者多方寻求“重建古史”的途径。在重申“史官史职”与注重考古发掘的同时,对于古代“书体书例”的归纳总结亦不失为一条有效的重建之路。  相似文献   

高校学报特色谈     

程里璇 《高教论坛》2001,(5):87-89

高校学报要具有竞争力必须要有自己的特色 ,要形成自己的特色可以通过设立特色专栏、学报版式的个性化、吸收外稿等途径来实现  相似文献   

An eight‐year study of online lecture use in a medical gross anatomy and embryology course     

Gary L. Nieder  Nicole J. Borges 《Anatomical sciences education》2012,5(6):311-320

Online lectures have been used in lieu of live lectures in our gross anatomy and embryology course for the past eight years. We examined patterns of online lecture use by our students and related that use to academic entry measures, gender and examination performance. Detailed access records identified by student were available from server logs. Total views per page of lecture material increased over the first six years, then decreased markedly between years seven and eight, possibly due to the recent availability of alternate forms of lecture audio. Lecture use peaked in midafternoon and again in the evening, although some use was seen at all hours. Usage was highest at midweek and lowest on Fridays as might be expected. Individual student's use varied widely from rates equivalent to less than one viewing/page to more than three viewings per page. Overall use by male students was greater than that of females and gender‐specific differences in the daily pattern were seen. Lecture use was correlated to the Medical College Admission Test® (MCAT®) Verbal Reasoning and Physical Sciences scores but not to composite MCAT scores or undergraduate grade point average. Overall use appeared to be driven by scheduled team‐based learning (TBL) sessions and major examinations. Specific subsets of lecture material were most often viewed before related TBL sessions and again during review for examinations. A small but significant correlation between lecture use and examination and course performance was seen, specifically in the male student population. These findings, along with earlier observations, suggest that varied use of online lectures is attributable to multiple factors. Anat Sci Educ © 2012 American Association of Anatomists.  相似文献   

Examining increased flexibility in assessment formats     

Brian Irwin  Stuart Hepplestone 《Assessment & Evaluation in Higher Education》2012,37(7):773-785

There have been calls in the literature for changes to assessment practices in higher education, to increase flexibility and give learners more control over the assessment process. This article explores the possibilities of allowing student choice in the format used to present their work, as a starting point for changing assessment, based on recent studies and current examples of flexible assessment practice in higher education. The benefits of this flexible assessment format approach are highlighted, along with a discussion of classic assessment considerations such as validity, reliability and marking concerns. The role of technology in facilitating assessment method choice is considered, in terms of new opportunities for providing student choice in the way they evidence their learning and present their work. Considerations for implementing flexible assessment choices into the curriculum are presented, along with a call that further research into such practice is needed to develop a comprehensive set of practical recommendations and best practice for the implementation of flexible assessment choice into the curriculum. The article should be of interest to curriculum developers and academics considering implementing changes to the assessment process to increase student ownership and control.  相似文献