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关键词： 城市“天际线”   “应力泡”   建筑载荷应力场   地质规划  

摘要： 针对城市地质中“天际线”地质规划工作需要,在地层均质弹性假设条件下,对地表带状载荷的建筑或者工程构建等角旋转法“应力泡”绘制方法进行讨论,并在此基础上绘制最大主应力的方向和大小,实现对地下空间建筑应力场的刻画,从几何学上实现建筑应力场和地下空间的沉积地质模型对接,从而为地质规划提供几何学分析依据。

ISBN: (纸本)9787302564676

关键词： 机械制图及计算机绘图   课程思政   教学改革   教学实践  

摘要： 课程思政是高校思想政治教育教学改革的内在要求,而课程是渗透思政教育的载体。《机械制图及计算机绘图》课程团队教师积极推动课程思政教学改革,以培养学生遵纪守法意识、树立正确的职业观念、培育工匠精神为主线实施课程思政。结合专业特点和课程特点,深入挖掘思政元素。本文从改革基础、设计思路、教学内容、教学手段、教学实践、教学效果、教学特色七个方面阐述教学模式探索与实践过程,为专业课程思政教育教学改革提供了改革思路和实践经验。

关键词： 文艺复兴   天工开物   天人合一   绿色发展  

摘要： 达芬奇是欧洲十五世纪文艺复兴时期“全人”的杰出代表,宋应星是同时期中国明朝著名的科技代表人物,二者的设计绘图分别代表了当时东西方科技文化水平。研究分别选取他们具有典型代表意义的五幅设计作品,运用比较研究法找出两者设计绘图的差异,通过分析两者间的表达内容、绘图技法、图面特征以及背后的设计思维方式,再从两者的家庭、个人成长历程、时代社会发展需求、哲学观念差异以及文字文化等多维度进行分析,找出设计绘图差异背后的根本原因。研究发现:达芬奇的设计绘图蕴含着人性的解放和崇尚科技的理念,宋应星天工开物的设计绘图蕴含着“天人合一”的人和自然和谐共生的思想精髓。然而,人性欲望的无止境与人性解放后的“人定胜天”思想,使西方的人与自然间的生态平衡被打破;而人与自然共生的思想早熟,也造成东方的懈怠和科技发展的缓慢。人类生存环境的恶化,促使西方通过批判性反思,才产生绿色可持续发展的理念,而东方的“天人合一”思想也充实完善了绿色发展理念。研究成果更加有益于树立文化自信,对当今设计领域中的绿色理念有所新的认识和启发。

关键词： Mn2O3   nanopowder   sol-gel synthesis   acetylacetonate  

摘要： MnOx thin films on various types of substrates (glass, quartz, alumina, and Pt/Al2O3/Pt) were prepared by a combination of the sol-gel method and pen plotter printing, using the hydrolytically active heteroligand complex [Mn(C5H7O2)(2 -)(x)(C4H9O)(x)] as the precursor. The effect of synthesis parameters and printing modes on the microstructure, optical and electrophysical properties of the manufactured planar nanomaterials was studied. The electron work function of the MnOx film surface was assessed by Kelvin probe force microscopy (KPFM). Impedance spectroscopy was used to determine the temperature-dependent electrical conductivity of the prepared films in the temperature range 325-500 degrees C. The proposed synthetic method and printing technology show promise for the formation of thin-film manganese oxide nanostructures for supercapacitor electrodes and optical devices.

ISBN: (纸本)9787121369544

关键词： Stress model   Student resilience   Classification ensemble   Educational innovation   Higher education  

摘要： Occupational stress has become an interesting field of research in recent years. Stress in students may yield a decline in academic performance or an increase of a mental issue, hence making of paramount importance the timely diagnosis of stress. Although there exist mechanisms for inferring stress level, most of them: assume the test subject is in a controlled environment;use uncomfortable or unaffordable sensors;or they are applicable only when the subject is at a particular posture. Moreover, to the best of the authors' knowledge, there is no method capable of plotting a person's stress level curve on the fly. In this paper, we propose a method capable of doing so;our method combines a set of one-class-classifiers capable of capturing the user stress level according to four strata (Low, Medium-Low, Medium-High, and High). Throughout our research, we have developed a dataset, called Student Resilience, which contains observation of several test subjects carrying a mobile phone, and wearing a wristband. For each test subject our dataset also contains the output of a collection of tests, especially designed to evaluate mental health and self-perceived stress. We have used the survey output as ground truth for validation purposes. Our method was capable of correctly plotting stress for 87% of the days submitted by the test subjects. Additionally, in a further attempt to validate our method, we have used data mining to determine whether a stress plot is likely to be explained by the unique activities carried out by each test subject for a given day of the week.

标准号: GB/T 33047.3-2021

摘要： 本文件规定了一种使用Ozawa-Friedman绘图测定活化能的方法。本文件还规定了用热重法验证反应动力学主曲线的方法。Ozawa-Friedman绘图(某质量损失下，以质量损失速率的对数对该质量损失下的温度的倒数作曲线)是一种微分方法，可以应用于温度任意变化程序的热分析中，如恒温、恒定升温速率、试样量控制热分析、温度阶跃和重复温度扫描。