ADAMS在机械原理课程教学中的应用

机械原理课程抽象概念多,尤其是机构运动学分析部分。传统的图解法和解析法存在繁琐及难以实际操作的缺点,学生较难理解。将ADAMS软件引入机械原理课堂教学,应用虚拟样机技术对机构进行三维建模、动态仿真,可有效解决学生对机构运动特性不易理解掌握的问题,同时极大地提高学生的学习兴趣和课堂效果。     

单纤维对训练的适应

随着特殊的训练计划被教练员们采用以促进运动员的肌肉适应能力,肌肉训练也成为渐进式康复的重要组成部分,它能阻止与丧失运动能力、老化、疾病或微重力相关的萎缩效应。为了优化不同类型的干扰措施,需要更好地理解运动训练产生的反应,以及识别决定肌肉功能的各种机制。虽然整体肌肉活动在某种程度上是通过适应运动神经元爆发、运动单元补充模式或者肌肉量来进行的,本研究着重探讨肌肉纤维类型的表达以及训练后收缩肌的功能性适应能力。单一无皮纤维被证明是常用的实验模型,用于研究与肌浆球蛋白重链对碘氧基苯甲醚相关的试管内收缩特性。人体纤维主要的功能和生化特性在过去二十年中已经被详细研究了,但近来,无皮纤维模式正被用于研究不同类型的诱发训练后单纤维的功能适应性。本文的目的是概述收缩肌对于特定运动训练计划的反应,以及帮助形成适用于运动科学和康复的训练计划。     

浅谈数控机床机械故障的诊断方法

文章分析了数控机床机械结构的组成及特点,并对数控机床机械结构提出了要求,总结了数控机床机械结构故障诊断的一系列方法,进而能够熟练运用掌握的技能处理各种不同的故障。     

直流电动机的调速研究

本文以他励直流电动机的调速为例,介绍了直流电动机的电枢回路串入电阻调速、降低电源电压调速和减弱磁通调速三种调速方法,并分析这三种调速方法的优缺点及适用范围。     

浅谈AutoCAD操作

AutoCAD在工程中是常用的绘图软件之一,从AutoCAD软件的操作界面着手,探讨初学者学习AutoCAD过程中可能遇到的问题和注意事项,介绍了绘制基本图形的顺序及操作方法,并着重阐述了“绘图”、“修改”、“尺寸标注”三个常用工具栏的使用。     

A nano to macroscale study on structure-mechanics relationships of archaeological oak

Mechanical properties of wood at different length scales of its hierarchical structure are governed by structural and compositional properties on smaller length scales. This opens up the possibility to use microstructural data for estimating mechanical properties, which are difficult to assess by conventional, destructive testing but are nevertheless of high relevance for conservation practice. Herein, we investigate such microstructure-mechanics relationships for a particular example, namely the load bearing archaeological oak of the Oseberg Viking ship, displayed at the Viking Ship Museum in Oslo, Norway. In order to identify the effects of degradation on the mechanical behavior and their relations to the microstructure, recent oak specimens of different geographical origin (Norway and Austria) are investigated as well. Wood exhibits a cellular structure. Its cell walls are composed of an amorphous polymer matrix consisting of lignin and hemicelluloses and embedded, stiff cellulose fibers. At the cell level, experimental studies comprised microscopic investigations of the cellular structure, chemical analyses of the composition of the cell walls, as well as nanoindentation tests on single cell walls. The same samples were also analyzed on the macroscopic level, where additionally mass density and annual ring data were measured together with ultrasonic stiffnesses. The chemical data clearly indicate deterioration in the archaeological oak, affecting mainly hemicelluloses and amorphous cellulose. At the cell wall scale, however, this does not necessarily lead to a weaker material behavior. The nanoindentation modulus, as a measure of the cell wall stiffness, was found to even increase. This is counterintuitive to our understanding of the effects of chemical degradation. It might be due to possible modification of lignin in the Oseberg oak, and thus have a stronger effect on the indentation modulus than the concurrent weakening of the interfaces between the load-carrying cellulose fibers and the connecting cell wall matrix when analyzing wood at the microscopic level. A similar effect is also observed for the transversal stiffness of macroscopic samples, which increases. In tension-dominated loading modes, however, the degradation of the interfaces is the dominant effect, resulting for example in a considerable reduction of the macroscopic stiffness in longitudinal direction. This underlines the utmost relevance of the loading condition on the remaining load-carrying capacity of degraded wood. On the macroscale, effects of the geographical origin (i.e. growth conditions) on ring characteristics of the oak tissues override the effects of degradation on the mechanical behavior. They have to be carefully extracted in order to come up with conclusions on the effect of degradation from macroscopic test results. The identified microstructure-mechanics relationships provide the basis for–in further research steps–building mathematical models describing the relations between microstructural characteristics and macroscopic mechanical properties and, thereon, for structural analyses of historical wooden objects.     

对日本冈山大学图学教育状况的思考

本文介绍了日本冈山大学制图课的教学状况,进而论述了相应得借鉴意义。     

Pro/E在《机械制图》多媒体课程教学中的应用

Pro／E是近年来迅速推广应用的三维CAD软件,在教学改革中,将其与机械制图有机地结合起来,使课堂教学变得形象、直观,并可激发学生的学习兴趣,在提高学生的空间想象和思维能力方面,达到了较好的教学效果。     

“工程制图与CAD”课程思政教学改革探索与实践

根据国家针对高校思想政治教育工作的重要指示可知,如何将课程思政融入课堂教学一直是教学改革关注的问题。以"工程制图与CAD"课程教学为例,对课程思政开展了相关探索与实践。结合课程特点进行思政内容挖掘,将家国情怀、职业精神塑造、文化共同体等思政内容结合专业知识进行教学设计,以期为本该领域相关研究提供借鉴和参考。     

中学英语词汇系统化教学

词汇作为语言的三大要素之一，是构筑语言的基本材料。因此，教师必须重视英语词汇的教学。本就中学英语词汇教学中的一些问题提出将英语词汇教学形成一套灵活体系的观点；展示了使英语词汇教学趣味化、多样化、条理化、系统化的方法．