国内隐性课程研究综述

文章以国内隐性课程理论研究成果为基础,对我国近二十余年的隐性课程研究历程进行了梳理,论述了隐性课程的有关问题,包括隐性课程的内涵、特点、范围、功能、隐性课程与显性课程的关系等。     

我校“传热学”重点课程建设思路及教学设计探讨

在介绍学校"传热学"课程的内容、性质、特点、课程发展的历史沿革等相关内容的基础上,确立了课程建设的目标和方案,提出了重点课程建设的思路和设想,并对课程的教学设计进行了探讨,为重点课程的建设明确了方向.     

包装机械课程知识体系探讨

包装机械课程是包装工程专业的核心课程之一,该课程为包装机械课程设计奠定了基础理论。本文从课程设置层面阐述了课程设置的必要性,从知识领域、知识点、知识单元层面介绍了课程的知识体系以及教学目标和教学目的。     

课程先行性的研究与应用

文章描述了课程先行性的内涵，定义了由课程先行性所派生的先行性约束关系，分析了机械自动化专业各课系之间的先行性关系。根据机械自动化专业的教学课程系列，设计了课程先行性关系图，说明了课程先行性分析对教学计划制定的意义。     

浅析高中语文校本课程的开发

新一轮基础教育课程改革正在全国范围如火如荼地开展着。新的课程改革强调要进行课程结构的调整，将校本课程与国家课程、地方课程并列，注重校本课程的开发，促进学生、教师和学校的共同发展。文章主要是针对高中语文的校本课程的开发进行了简单的分析。     

高职类机械制图课程整合的思考

根据高职教育的特点，阐述了高职类机械制图课程整合的必要性，分析了现阶段制图课程，教材的整合状况及其存在的问题，通过借鉴本科类机械制图课程的整合思路，并结合制图课教学的实际，提出了高职类制图课程与其它相关课程的整合方法，得出大范围浅深度的课程整合方案是适合于高职类制图课程整合思路的结论，并对该整合方案的具体操作进行了探讨，最后，指出了课程整合思路的结论，并对该整合方案的具体操作进行了探讨，最后，指出了课程整合所带来的教学困难。     

浅谈对课程教学设计的认知

本文阐述了对课程教学设计内涵的理解,介绍了对课程教学设计内容的把握,提出了课程教学设计实施的有效途径,并给出了课程教学设计比赛的评价标准,对开展课程教学设计有一定的参考意义。     

“互联网+”背景下加强职高在线课程的标准化建设

信息技术在教育领域的渗透推动了教学方法的改革,网络教学资源平台建设标准化日趋成熟,混合式教学模式得到推广应用。微观课程和仿真课程质量不断标准化,高职院校建设标准化高质量的网络课程是提升教育机构内涵的必然要求。基于多年来高职院校教学资源建设标准化的实践,本文探讨了"互联网+"背景下网络课程建设的标准化思路,从网络课程平台建设标准化、教师队伍建设、课程设计、课程实施等方面进行了研究。探讨了网络课程评价指标的作用和网络课程评价的基本要素,为提高学生的学习兴趣和教学效果,建设标准化的网络课程提供参考。     

基于微信平台的服装设计微课程群建设的理论分析

文章研究的是运用手机智能终端技术,针对目前微课程发展情况的研究,探索了微课程相关理论,梳理了微课程近年来的研究成果,分析了建设服装微课程群的意义和优势。     

《电力电子技术》在线开放课程与混合式教学

在线开放课程是信息化与教育相结合的产物,5G时代的到来,将进一步推动在线开放课程快速发展.文章依托智慧职教云课堂,初步探究了《电力电子技术》在线开放课程的建设,将专业核心技术融入专业基础课程中对教学内容进行了整合,开发了一系列的线上开放课程资源.同时,充分利用开发的在线开放课程,探索了混合式教学模式,并取得了较好效果,为初期建设在线开放课程教师提供了实践经验及思路.     

Gefügemäßige Bewertung der Schweißeignung von Stahlgusssorten unter Berücksichtigung der Kaltrissbeständigkeit

Microstructural evaluation of weldability of cast steels considering the sensitivity to cold cracking The behaviour of different types of cast steel at welding of structures is widely determined by the specialities of the microstructure in the heat affected zone (HAZ). The identification of the different areas of microstructure depends on the alloying system of the cast material. At the evaluation of the weldability of cast steels with high or low carbon contents high attention should be drawn to the sensitivity to cold cracking, which correlates with the chemical composition as well as with the inhomogenieties of the initial microstructure.     

Specific Features of the Behavior of Ceramics Based on ZrO2 with an Admixture of 9 Mole% CeO2 in the Process of Deformation

For zirconia ceramics stabilized with 9 mol.% CeO ₂, we study specific features of the processes of deformation and formation of the zones of transformation of the tetragonal phase into the monoclinic phase under the action of mechanical stresses. It is shown that, at room temperature, this transition occurs explosively (autocatalytically) and is accompanied by the formation of large zones of the -phase in the form of strips on the surface of tension of the specimen and the appearance of a nonlinear sawtooth section in the stress–strain diagram. As the testing temperature increases, the degree of autocatalyticity decreases together with the degree of nonlinearity and the diagrams lose their sawtooth character. At the same time, the strength of the material becomes almost four times higher at ~ 200°C and then decreases to the initial level at 400°C. It is assumed that this Type of mechanical behavior can be explained by changes in the mechanisms of hardening of ceramics.     

Formation of the reaction zone between tin‐copper brazing fillers and aluminum‐silicon‐magnesium alloys: Experiments and thermodynamic analysis

A primary challenge in brazing is the controlled formation of phases resulting from interactions of elements of the liquid filler metal with those of the base material. The morphology of the brazed joint, which is decisive for the mechanical properties of the joint, is influenced by present elements and process parameters such as brazing temperature and time. Furthermore, the wetting of the base material is a crucial factor in joining of aluminum because of the low wettability of the alumina layer by molten brazing filler metals. In order to remove the alumina and prevent reoxidation of the substrate surface, the brazing process can be conducted in vacuum or inert gas atmosphere. Again, selection of process parameters is crucial for the quality of the brazed seam. In this work, we focus on the influence of the process parameters on the wetting behavior and the formation of aluminum‐copper phases theoretically by means of thermodynamic calculations using a CALPHAD database as well as by means of in‐situ observations in the large‐chamber scanning electron microscope (LC‐SEM) and by brazing experiments. Both the critical temperatures with respect to the wetting and the reaction kinetics as well as the crucial stages of the brazing process and the resulting phases were determined.     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

力、热载荷作用下纤维在复合材料中的界面应力传递行为

采用三维光弹性实验应力分析和有限元计算两种方法,在拉拔载荷和热残余应力联合作用下,对单丝拔出树脂基复合材料三维冻结切片界面剪应力进行了研究。实验结果和计算表明,在单纤维与基体界面的埋入端及埋入末端附近出现界面残余剪应力的极值;力、热载荷作用下纤维界面剪应力呈抛物线分布,单丝埋入端附近是应力的主要传递区域,最先达到危险应力,出现界面脱胶破坏,然后剪应力沿纤维埋入长度由纤维埋入端附近向埋入末端逐渐传递;界面热残余应力对界面剪应力的影响是使纤维埋入末端应力集中程度降低,使界面剪应力最大值增大。      

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

空心微珠填充聚氨酯泡沫塑料的力学性能

对不同密度和不同填充质量比的空心玻璃微珠填充聚氨酯泡沫塑料进行拉、压实验,研究了微珠对复合泡沫塑料力学性能的影响。实验结果表明:复合泡沫塑料拉伸曲线特征与普通泡沫塑料类似,但具有不同于普通泡沫塑料的压缩应力-应变特性;材料密度越大,微珠对胞体壁的增强效果越好;微珠团聚和界面粘结不良将可能导致材料力学性能的下降。根据有限元模拟结果和试件破坏形貌的观察探讨了材料的变形和破坏机制。      

Investigations into the improvement of the weather protection of unburnt brick masonry,part 1

In June 2006, the Chair of Structural Design at the Technical University of Dresden was commissioned by the Iranian cultural authority ICHHTO and the UNESCO to perform structural design services for the earthquake‐resistant repair and rebuilding of the Sistani House in the historic citadel Arg‐e‐Bam in the south of Iran. The citadel was until its almost complete destruction by an earthquake on 26 Dezember 2003 the largest building of unburnt brick masonry in the world and is listed as a World heritage Site by UNESCO because of its cultural and historical significance. Surveying and documentation work, archaeological rubble clearance and the rebuilding of the Sistani House after its destruction by the earthquake have taken the team from the department to Bam at regular intervals since 2006. In the course of the work, it became apparent that research was needed in the field of the repair of earthquake‐damaged unburnt brick masonry and into the improvement of the shear strength/earthquake resistance and the weather protection of unburnt brick masonry. The article is subdivided in Part 1, Introduction, test performance and assessment of results for additives to loam render as well as Part 2, Assessment of the results for surface treatment to unburnt bricks and the climatic chamber tests.     

Predicting the viscosity of liquid refrigerant blends: comparison with experimental data

A method is presented for predicting the viscosity of liquid refrigerant mixtures. The method has no adjustable parameters and, in essence, relies upon the knowledge of the viscosity of the pure components to predict the viscosity of a mixture by means of kinetic theory and rigid-sphere formalism. The predictions have been compared with the available experimental data for a number of refrigerant mixtures. Based on this comparison and previous studies, the accuracy of the proposed method is assessed to be of the order of ±7%.     

Schädigungsverhalten metallischer Hülsen in CFK‐Bolzenverbindungen

The excellent specific and mechanical properties of fibre reinforced plastics (FRP), especially in respect of substituting of primary metal structures, caused an increasing demand in the aircraft construction industry. The material requirements demanded from conventional rivet connections, for example the lockbolt system, increased contemporaneously. Unfortunately, rivet holes of the mating parts interfere with the natural fibre patterns and thereby causing certain imperfections in the material. In addition, the fitting of the lockbolt could lead to undesirable delamination and fibre disruptions around the corner of the rivet hole. This has a further adverse impact on the joint strength. The insertion of a steel sleeve leads to a radial expansion of the sleeve during the fitting of the lockbolt. Thus, critical shear stress can be avoided during the bolt fitting. The increased complexity of the whole joint structure requires compliance with strict process limits, otherwise damages to the sleeve and, consequentially, to the entire compound are likely. The aim of this study is a detailed characterization of the sleeve material and of the entire process including the process limits. The finite element method is used as an important tool for assisting in the select correct process parameters. Based on the results of tensile tests, a certain material model on the basis of one failure criterion was defined for the steel sleeve and then implemented in the simulation of the bolt fitting. Within the setting of an unfavourable combination of process parameter, the numerical results evidence a realistic failure of the sleeve when compared with results from experimental tests.