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疫情防控期间,教育部要求在保障师生健康安全的基础上做好"停课不停教、停课不停学"工作,各地学校纷纷在短时间内紧急筹备,从确定教学方式到部署信息化设施再到教师培训试讲,开展了大规模线上教学。文章以上海交通大学为例,分析了学校在"停课不停学"时期对在线教学方式和在线教学平台的选择,介绍了学校在线教学的质量控制与反馈情况,并对疫后在线教学改革进行了思考,探讨如何将在线教学的技术优势保持下去,并利用信息技术推动教学方法创新和教学模式变革,以加快实现人才培养和立德树人的根本目标。 相似文献
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Roel Hendrickx Ester S.B. Ferreira Jaap J. Boon Guylaine Desmarais Dominique Derome Lora Angelova 《文物保护研究》2017,62(7):393-409
Moisture is a driving factor in the long-term mechanical deterioration of canvas paintings, as well as for a number of physico–chemical degradation processes. Since the 1990s a number of publications have addressed the equilibrium hygroscopic uptake and the hygro-mechanical deformation of linen canvas, oil paint, animal glue, and ground paint. In order to visualise and quantify the dynamic behaviour of these materials combined in a painting mock-up or reconstruction, we have performed custom-designed experiments with neutron radiography and nuclear magnetic resonance (NMR) imaging. This paper reports how both techniques were used to obtain spatially and temporally resolved information on moisture content, during alternate exposure to high and low relative humidity, or in contact with liquids of varying water activities. We observed how the canvas, which is the dominant component in terms of volumetric moisture uptake, absorbs and dries rapidly, and, due to its low vapour resistance, allows for vapour transfer towards the ground layer. Moisture desorption was generally found to be faster than absorption. The presence of sizing glue leads to a local increase of moisture content. It was observed that lining a painting with an extra canvas results in a damping effect: i.e. absorption and drying are significantly slowed down. The results obtained by NMR are complementary to neutron radiography in that they allow accurate monitoring of water ingress in contact with a liquid reservoir. Quantitative results are in good agreement with adsorption isotherms. The findings can be used for risk analysis of paintings exposed to changing micro-climates or subjected to conservation treatments using water. Future studies addressing moisture-driven deformation of paintings can make use of the proposed experimental techniques. 相似文献
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翻转课堂是利用信息化手段将课堂内外教学任务进行颠倒的课堂教学模式,成为重构课堂教学活动,推进信息技术与教学深度融合的课堂教学改革新方式。该文分析了研究生使用翻转课堂教学的可行性,提出了翻转课堂开展的四个条件,并尝试使用Canvas学习管理系统,以研究生《教育技术学》课程为例,分析了基于Canvas的翻转课堂空间、内容与方法、时间三个要素的设计方法,构建了研究生翻转课堂的实施模式,组织研究生开展了翻转课堂对比实验研究,对教学效果进行了分析与反思,从实验研究的视角验证了研究生开展翻转课堂的可行性与存在问题。 相似文献
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张金听 《宁波职业技术学院学报》2005,(5)
介绍了Delphi语言中的画布技术,尝试用描点法绘制у=Asin(ωx+Ψ)函数图像,并实现у=sinx函数图像到у=Asin(ωx+Ψ)函数图像的动态变化过程。总结出在Delphi中绘制函数图像的一般方法。 相似文献
6.
Daniel Tik-Pui Fong Jing Xian Li 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(3):407-417
In this study, we evaluated the protective functions of cloth sport shoes, including cushioning and lateral stability. Twelve male students participated in the study (mean ± s: age 12.7 ± 0.4 years, mass 40.7 ± 5.9 kg, height 1.50 ± 0.04 m). Cloth sport shoes, running shoes, basketball shoes, cross-training shoes, and barefoot conditions were investigated in random sequence. Human pendulum and cutting movement tests were used to assess cushioning performance and lateral stability, respectively. For cushioning, the running shoes (2.06 body weight, BW) performed the best, while the cross-training shoes (2.30 BW) and the basketball shoes (2.37 BW) both performed better than the cloth sport shoes (2.55 BW) and going barefoot (2.63 BW). For the lateral stability test, range of inversion–eversion was found to be from 3.6 to 4.9°, which was far less than that for adult participants (> 20°). No significant differences were found between conditions. All conditions showed prolonged durations from foot-strike to maximum inversion (66–95 ms), which was less vigorous than that for adult participants ( < 40 ms) and was unlikely to evoke intrinsic stability failure. In conclusion, the cloth sport shoe showed inferior cushioning capability but the same lateral stability as the other sports shoes for children. 相似文献
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Teresa Cerchiara Giuseppe Chidichimo Maria Caterina Gallucci Rita Ferraro Danilo Vuono Alfonso Nastro 《Journal of Cultural Heritage》2009,10(3):396-402
One of the problems in the field of cultural heritage is the degradation of artworks and especially paintings. They appear very sensitive to environmental conditions. In this work, Spanish broom canvas is proposed as a novel painting support. In order to assess the deterioration properties of this new type of canvas, three degradation processes (exposure to wet atmosphere, to acidic attack and to UV light) were simulated and investigated. The deterioration state of the samples was monitored with Infrared Spectroscopy (FT-IR) and Thermogravimetric Analysis (TGA). The structure of the canvas was also analyzed by Scanning Electron Microscopy (SEM). These techniques were successfully applied to study the occurrence significant changes of samples. The exposure to acidic and UV attack produced deep changes on the samples (only on the canvas surface in the case of UV light), while no significant effect was identified on the sample after the exposure to wet atmosphere. The results obtained from Spanish broom canvas are reported in comparison to flax canvas. 相似文献
8.
阅读推广模式是开展阅读推广的典范性有效体系的抽象,本研究利用商业模式画布思维框架,构建高校图书馆阅读推广一般模式或体系。高校图书馆应从相互关联的九方面构建阅读推广模式,即深入准确认识用户、精心设计并传递价值主张、建立高效便捷的互动渠道、积极发展和维护读者关系、获取持续稳定的财务来源、识别并整合利用关键资源、发展关键合作关系、有效管控关键活动、最优化成本结构。 相似文献
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Nick Faulk 《Journal of Library & Information Services in Distance Learning》2018,12(3-4):198-208
This case study provides insights into how one academic library scaled and structured its information literacy program for a rapidly growing online learning division. Particular attention is paid to strategies for reaching learners who bypass portions of the liberal studies requirements and techniques for designing information literacy modules taught by the instructor of record. This case study demonstrates how this library’s online information literacy program reached a new population of student while creating efficiencies with staff time. Attention is also paid to aspects of the program still under development, such as additional modules and a comprehensive assessment strategy. 相似文献
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《文物保护研究》2013,58(4):237-253
AbstractThe requirements for, and assessment of, suitable fabrics for artist canvas and for the structural reinforcement of easel paintings on canvas are presented. Crucially, the aesthetic and kinaesthetic, as well as physical properties of the canvas fabrics have been taken into account. To evaluate the fabrics the following properties were measured: stiffness, ultimate tensile strength, moisture response, crimp, drape, and lustre. Fabrics investigated include cotton, linen, polyester, polyamides, and carbonized fibres. Although polyester is yet to match linen or cotton kinaesthetically or aesthetically, overall it exhibits the best combination of properties. However, the results have shown that even when raw fibre material has suitable properties the finished woven fabric may not. This is because of the strong influence of the woven geometry on the final behaviour. It has been found that drape and lustre are very good properties to quantify some aspects of the feel and look of fabrics, in the context of conservation, and to provide a common language to ensure that the specification incorporates these aspects. 相似文献