针对当前“教—学—评”一体化理论认知片面化、实践目标扁平化、过程程序化、评价单一化等问题,为推动课程改革,深入研究将主题意义探究(Theme-explored)、目标导向(Object-directed)、任务驱动(Task-based)、实证评价(Evidence-evalua...针对当前“教—学—评”一体化理论认知片面化、实践目标扁平化、过程程序化、评价单一化等问题,为推动课程改革,深入研究将主题意义探究(Theme-explored)、目标导向(Object-directed)、任务驱动(Task-based)、实证评价(Evidence-evaluated)(简称“TOTE”)融入教学过程的课程模型,深入阐释TOTE“教—学—评”一体化的核心理念,构建指向核心素养的TOTE教学评V-model模型理论框架。提出落实TOTE“教—学—评”一体化的关键举措,明确基于评价的“大小循环”对反拨教学的重要意义,并以北师大版初中《英语》九年级Unit 9 Save the Planet为例,探讨TOTE“教—学—评”一体化教学的实施策略。展开更多
The mixing performance of a multi-bladed baffle inserted into a traditional Gallay tote blender is explored by graphic processing unit-based discrete element method software. The mixing patterns and rates are investig...The mixing performance of a multi-bladed baffle inserted into a traditional Gallay tote blender is explored by graphic processing unit-based discrete element method software. The mixing patterns and rates are investigated for a binary mixture, represented by two different colors, under several loading profiles. The baffle effectively enhances the convective mixing both in the axial and radial directions, because of the disturbance it causes to the initial flowing layer and solid-body zone, compared with a blender without a baffle. The axial mixing rate is affected by the gap between the baffle and the wall on the left and right sides, and an optimal blade length corresponds to the maximum mixing rate. However, the radial mixing rate increases with the blade length almost monotonically.展开更多
The mixing performance of a multi-bladed tote blender is investigated using a graphics processing unit-based discrete element method program.The positioning,dimensions,and applicability of the baffles are systematical...The mixing performance of a multi-bladed tote blender is investigated using a graphics processing unit-based discrete element method program.The positioning,dimensions,and applicability of the baffles are systematically studied according to the axial mixing efficiency.The results indicate that the novel inclined multi-bladed baffles can break the symmetrical axial granular flow and introduce a more efficient convective flow into the granular mixing in the axial direction of the tote blender.Owing to the joint effects of convective mixing and asymmetrical granular flow,the axial mixing efficiency is increased by a factor of nearly 20.More importantly,the novel baffle placement approach exhibits excellent applicability to different operating conditions,particle shapes,and blender sizes.Additionally,the inclined baffles can prevent the segregation caused by shape discrepancies and improve the mixing homogeneity in the steady state.The novel baffle design is promising for applications in more complex industrial blenders for achieving a high axial mixing efficiency.展开更多
文摘针对当前“教—学—评”一体化理论认知片面化、实践目标扁平化、过程程序化、评价单一化等问题,为推动课程改革,深入研究将主题意义探究(Theme-explored)、目标导向(Object-directed)、任务驱动(Task-based)、实证评价(Evidence-evaluated)(简称“TOTE”)融入教学过程的课程模型,深入阐释TOTE“教—学—评”一体化的核心理念,构建指向核心素养的TOTE教学评V-model模型理论框架。提出落实TOTE“教—学—评”一体化的关键举措,明确基于评价的“大小循环”对反拨教学的重要意义,并以北师大版初中《英语》九年级Unit 9 Save the Planet为例,探讨TOTE“教—学—评”一体化教学的实施策略。
基金This work was supported by the National Key Basic Research Program of China under Grant No. 2015CB251402, the National Natural Science Foundation of China under Grant Nos. 21206167, 21225628, 91434201, and 91334204, the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant No. XDA07080203, and CAS Interdisciplinary Innovation Team.
文摘The mixing performance of a multi-bladed baffle inserted into a traditional Gallay tote blender is explored by graphic processing unit-based discrete element method software. The mixing patterns and rates are investigated for a binary mixture, represented by two different colors, under several loading profiles. The baffle effectively enhances the convective mixing both in the axial and radial directions, because of the disturbance it causes to the initial flowing layer and solid-body zone, compared with a blender without a baffle. The axial mixing rate is affected by the gap between the baffle and the wall on the left and right sides, and an optimal blade length corresponds to the maximum mixing rate. However, the radial mixing rate increases with the blade length almost monotonically.
基金This work was supported by the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20190892)the Scientific Research Starting Foundation of Jjining University,Shandong Province,China(Grant No.2019BSZX04)Binzhou University,Shandong Province,China(Grant No.2018Y25].
文摘The mixing performance of a multi-bladed tote blender is investigated using a graphics processing unit-based discrete element method program.The positioning,dimensions,and applicability of the baffles are systematically studied according to the axial mixing efficiency.The results indicate that the novel inclined multi-bladed baffles can break the symmetrical axial granular flow and introduce a more efficient convective flow into the granular mixing in the axial direction of the tote blender.Owing to the joint effects of convective mixing and asymmetrical granular flow,the axial mixing efficiency is increased by a factor of nearly 20.More importantly,the novel baffle placement approach exhibits excellent applicability to different operating conditions,particle shapes,and blender sizes.Additionally,the inclined baffles can prevent the segregation caused by shape discrepancies and improve the mixing homogeneity in the steady state.The novel baffle design is promising for applications in more complex industrial blenders for achieving a high axial mixing efficiency.
