汽车转向梯形的Matlab设计及其结果分析

以ＭＡＴＬＡＢ语言为工作平台,充分利用其强大的计算图形功能及可视化编程技术、编制程序进行汽车转向梯形机构的最优化设计,其特点简洁、方便、可靠;文章最后对最优化结果进行了图形分析处理,指出了ＭＡＴＬＡＢ计算语言与机械优化设计相结合的重要性。     

English engineer John Smeaton's experimental method(s): Optimisation,hypothesis testing and exploratory experimentation

In this paper I provide a detailed account of eighteenth-century engineer John Smeaton's experimental methods, with the aim of bringing our understanding of his work into line with recent research in the history and philosophy of science. Starting from his use of the technique of parameter variation, I identify three distinct methodological aims in the research he carried out on waterwheels, windmills and hydraulic mortars. These aims are: optimisation, hypothesis testing and maxim generation. The main claim of this paper is that Smeaton did more than merely improve engineering methods by systematising earlier artisanal approaches, which is the classic view of Smeaton's method developed by historians of technology in the 1990s. I argue instead that his approach bridged the divide between science and technology, by integrating both hypothesis testing and exploratory experimentation. This is borne out, in particular, by the way that Smeaton emphasised the exploratory side of the work he published in the Philosophical Transactions, in contrast to his account of the construction of the Eddystone lighthouse, which was aimed at a broader, non-specialist public. I contribute to recent research on exploratory experimentation by showing – in line with other work on this topic – that exploratory experimentation is not incompatible with hypothesis testing. This new perspective on Smeaton's method will hopefully lead to further research and new insights into the relation between science and technology at the start of the Industrial Revolution.     

体育系学生的成就动机、测验焦虑、智力水平与学业成绩的相关研究

本文运用运动心理学知识,探讨了体育院系学生专业学习中诸多变量之间的关系,结果显示：（１）体育院系大部分学生成就动机很强,测验焦虑较弱,智力水平较好;（２）学业成绩与智力水平之间存在着显著的正相关,与测验焦虑之间存在着更为明显的负相关;（３）测验焦虑与成就动机、智力水平、学业成绩之间都存在显著的负相关;（４）成就动机与学业成绩之间存在着微弱的正相关,说明体育院系学生成就动机与效果之间尚有差距二     

具有贝努里反馈的非对称穷尽服务轮询系统

研究了具有贝努里反馈的非对称穷尽服务轮询系统。在平稳条件下给出了队长与逗留时间的分布,以及其他一些结果。     

Fe3Al合金铸造工艺性能的研究

介绍了Fe3Al合金铸造工艺参数的测试过程,分析了结果及产生这一结果的原因,在此基础上确定了Fe3Al合金的铸造工艺设计原则,从而为指导生产提供了依据。解决了Fe3Al系列合金优良的高温性能与低劣的铸造工艺性能这对矛盾,使这类合金得以实现推广应用。     

Distributed location-based query processing on large volumes of moving items

Recently, new techniques to efficiently manage current and past location information of moving objects have received significant interests in the area of moving object databases and location-based service systems. In this paper, we exploit query processing schemes for location management systems, which consist of multiple data processing nodes to handle massive volume of moving objects such as cellular phone users.To show the usefulness of the proposed schemes, some experimental results showing performance factors regarding distributed query processing are explained. In our experiments, we use two kinds of data set: one is generated by the extended GSTD simulator and another is generated by the real-time data generator which generates location sensing reports of various types of users having different movement patterns.     

双电机双变频器实验系统的研究与分析

提出一种适用于测试不同频率下时机运行特性的新型实验系统。该系统由两台变频器和两台异步电动机构成，测试了电机在不同频率下的四象限运行特性，分析了不同频率下电机转矩的大小以及频差的正负对电机工作状态的影响。文章给出了系统的组成原理、控制原理及实验结果，该实验系统同传统的方法相比，具有节能显著、改接线方便、不宜出错的优点。     

选项课对学生健康素质影响的分析

经过测试发现，由于学生选择的项目不同，其锻炼效果也各有差异．如何使不同的运动项目锻炼效果一致，本文提供些参考意见，以使选项课教学更加完善。     

提高课堂教学效果策略的探讨

本文论述了目前大学本科课堂教学中存在的问题，依据教育学理论，结合个人的教学实践和教学督导听课情况，提出了课堂教学要做到“三严”、“四点”、“五性”和“五备”的方法．实践表明，所提出的方法可行，对提高课堂教学质量能起到明显的效果．     

红毛五加茎皮中总皂苷超声提取工艺研究

采用正交实验法,以总皂苷的含量为工艺筛选指标、超声提取方法为提取方法对红毛五加茎皮中总皂苷的提取工艺进行了研究,建立了红毛五加茎皮中总皂苷的最佳提取工艺,确定最佳提取工艺条件为:超声时间为30min,料液比为1∶10,乙醇浓度为80%,提取1次为最佳.