从概念维度和模型维度,结合年级分布和环节分布,对中国北师大版小学数学教材和新加坡小学数学教材My Pals Are Here中的“分数的意义”内容进行分析比较,发现:两版教材中“分数的意义”内容的编排和呈现基本符合学生的认知发展水平,新...从概念维度和模型维度,结合年级分布和环节分布,对中国北师大版小学数学教材和新加坡小学数学教材My Pals Are Here中的“分数的意义”内容进行分析比较,发现:两版教材中“分数的意义”内容的编排和呈现基本符合学生的认知发展水平,新加坡版教材运用大量的度量模型突出分数的“度量”意义,北师大版教材运用大量的面积模型突出分数的“整体中的部分”意义。由此提出教学建议:明确分数的多种意义,重视“度量”意义;丰富分数的表征模型,增加度量模型;突出单元的核心目标,引领课时学习。展开更多
The use of the Albanian geothermal springs and waters, for their curative effects （Natural SPA） dates back centuries, since the time of the Roman Empire, while their first modern use started only in 1937. Unfortunat...The use of the Albanian geothermal springs and waters, for their curative effects （Natural SPA） dates back centuries, since the time of the Roman Empire, while their first modern use started only in 1937. Unfortunately they had not been used for its energetic values yet. The temperature of the water is above 60 ~C and the flow above 16 L/s, thus direct utilization is possible, in particular for space heating. Three-dimensional temperature field calculations and engineering calculations on a heating system with heat exchangers are presented here. The results show that the water temperature is expected to be stable and considerably higher temperature is expected through deep well drilling. The University＇s Campus of Tirana is composed of 29 buildings, which are partially heated through a coal heater. The installed capacity is 2,558 kW while the coal consumption is about 920 kg/h. The University＇s Campus of Tirana is one of the most important areas and with the highest density of population in Tirana, so it is the best area to show the heat exchanger efficiency. The economic analyses prove that the borehole heat exchangers are more convenient than the coal heating systems.展开更多
文摘从概念维度和模型维度,结合年级分布和环节分布,对中国北师大版小学数学教材和新加坡小学数学教材My Pals Are Here中的“分数的意义”内容进行分析比较,发现:两版教材中“分数的意义”内容的编排和呈现基本符合学生的认知发展水平,新加坡版教材运用大量的度量模型突出分数的“度量”意义,北师大版教材运用大量的面积模型突出分数的“整体中的部分”意义。由此提出教学建议:明确分数的多种意义,重视“度量”意义;丰富分数的表征模型,增加度量模型;突出单元的核心目标,引领课时学习。
文摘The use of the Albanian geothermal springs and waters, for their curative effects （Natural SPA） dates back centuries, since the time of the Roman Empire, while their first modern use started only in 1937. Unfortunately they had not been used for its energetic values yet. The temperature of the water is above 60 ~C and the flow above 16 L/s, thus direct utilization is possible, in particular for space heating. Three-dimensional temperature field calculations and engineering calculations on a heating system with heat exchangers are presented here. The results show that the water temperature is expected to be stable and considerably higher temperature is expected through deep well drilling. The University＇s Campus of Tirana is composed of 29 buildings, which are partially heated through a coal heater. The installed capacity is 2,558 kW while the coal consumption is about 920 kg/h. The University＇s Campus of Tirana is one of the most important areas and with the highest density of population in Tirana, so it is the best area to show the heat exchanger efficiency. The economic analyses prove that the borehole heat exchangers are more convenient than the coal heating systems.
