分析初中英语写作教学存在的问题及"以说促写"教学的相关理论基础。基于《义务教育英语课程标准(2011年版)》中的要求,提出基于导学合作的"以说促写"教学模式。以人教版新目标Go For It!八年级(下)第一单元到第四...分析初中英语写作教学存在的问题及"以说促写"教学的相关理论基础。基于《义务教育英语课程标准(2011年版)》中的要求,提出基于导学合作的"以说促写"教学模式。以人教版新目标Go For It!八年级(下)第一单元到第四单元中有关problems的话题为例,结合具体的英语写作教学实例,分析"三段七步"以说促写教学模式的具体应用。认为"以说促写"英语写作教学模式能有效激发学生的写作动机,提高学生的写作水平。展开更多
Transpiration element is included in the integrated stomatal conductance photosynthesis model by considering gaseous transfer processes, so the present model is capable to simulate the influence of boundary layer con...Transpiration element is included in the integrated stomatal conductance photosynthesis model by considering gaseous transfer processes, so the present model is capable to simulate the influence of boundary layer conductance. Leuning in his revised Ball's model replaced relative humidity with VPD s (the vapor pressure deficit from stomatal pore to leaf surface) and thereby made the relation with transpiration more straightforward, and made it possible for the regulation of transpiration and the influence of boundary layer conductance to be integrated into the combined model. If the differences in water vapor and CO 2 concentration between leaf and ambient air are considered, VPD s , the evaporative demand, is influenced by stomatal and boundary layer conductance. The physiological responses of photosynthesis, transpiration, and stomatal function, and the changes of intercellular CO 2 and water use efficiency to environmental factors, such as wind speed, photon flux density, leaf temperature and ambient CO 2, are analyzed. It is shown that if the boundary layer conductance drops to a level comparable with stomatal conductance, the results of simulation by the model presented here differ significantly from those by the previous model, and, in some cases, are more realistic than the latter.展开更多
文摘分析初中英语写作教学存在的问题及"以说促写"教学的相关理论基础。基于《义务教育英语课程标准(2011年版)》中的要求,提出基于导学合作的"以说促写"教学模式。以人教版新目标Go For It!八年级(下)第一单元到第四单元中有关problems的话题为例,结合具体的英语写作教学实例,分析"三段七步"以说促写教学模式的具体应用。认为"以说促写"英语写作教学模式能有效激发学生的写作动机,提高学生的写作水平。
文摘Transpiration element is included in the integrated stomatal conductance photosynthesis model by considering gaseous transfer processes, so the present model is capable to simulate the influence of boundary layer conductance. Leuning in his revised Ball's model replaced relative humidity with VPD s (the vapor pressure deficit from stomatal pore to leaf surface) and thereby made the relation with transpiration more straightforward, and made it possible for the regulation of transpiration and the influence of boundary layer conductance to be integrated into the combined model. If the differences in water vapor and CO 2 concentration between leaf and ambient air are considered, VPD s , the evaporative demand, is influenced by stomatal and boundary layer conductance. The physiological responses of photosynthesis, transpiration, and stomatal function, and the changes of intercellular CO 2 and water use efficiency to environmental factors, such as wind speed, photon flux density, leaf temperature and ambient CO 2, are analyzed. It is shown that if the boundary layer conductance drops to a level comparable with stomatal conductance, the results of simulation by the model presented here differ significantly from those by the previous model, and, in some cases, are more realistic than the latter.