百农AK58小麦光合特性的研究     

肖媛  牛立元  茹振钢 《河南科技学院学报》2007,35(3):19-21

在大田条件下,研究了百农AK58及温麦6号、新麦18号、周麦18号 4个小麦品种旗叶的光合作用特性.研究表明:百农AK58、温麦6号、新麦18号和周麦18号旗叶净光合速率/光合有效辐射的拟合系数分别为:0.91,0.59,0.43,0.79;最大净光合速率分别为:22.8μmol·m2·s-1,20.6μmol·m2·s-1,19.4μmol·m2·s-1,21.5μmol·m2·s-1;光补偿点分别为:75.9μmol/(m2·s),24.2μmol/(m2·s),76.9μmol/(m2·s),115.4μmol/(m2·s);CO2补偿点分别为:75.5 μmol/mol,43.7 μmol/mol,75.6 μmol/mol,81.5 μmol/mol.结果表明:百农AK58小麦品种具有较强的耐高温、强光特性和较好的光合生产潜力.  相似文献   

关于我国教育发展与收入差异研究     

Chen Yun 《民办教育研究》2007,(4)

文章运用1978年以来有关统计数据进行实证,发现我国近几十年教育的发展不断扩大了城乡居民收入差异和各地区经济发展的差距。因此建议重视农村和欠发达地区教育发展,鼓励和扶持大学生到农村和欠发达地区创业。  相似文献   

幼态持续、发展的原发性和早期教育   总被引：4，自引：0，他引：4  

杨宁 《西北师大学报》2002,39(4):28-31

对童年期本质的认识是儿童教育的基石，通过讨论人类童年期延长的原因及其适应性价值，结合幼儿发展的原发性，指出当前早期教育中存在着严重的违背儿童天性，忽视儿童天性的现象，基此，深入理解儿童发展的本质，并建立新的儿童教育哲学刻不缓行。  相似文献   

物理学在钢琴演奏中的运用     

唐碧蓉 《内江师范学院学报》2002,17(3):91-94

本通过具体实例论证了钢琴演奏中的惯性、反作用力，平衡性等物理现象，充分说明了钢琴弹奏中的科学性，同时也提醒我们只有运用科学的方法来弹奏钢琴，才能真正将钢琴这门乐器发挥到最佳水平。  相似文献   

合理配料,提高水泥熟料质量     

康怀云 《洛阳工业高等专科学校学报》2004,14(3):11-12

水泥的强度低，安定性不合格，主要是配料不当的原因造成的．选择合理的配料三率值是提高水泥质量的关键，合理的配料三率值是利用水泥生产技术，结合本厂原料的具体实际在生产实践中不断摸索出来的。  相似文献   

改进的FCG软件试验数据处理方法     

WENG Yong-gang 《实验室研究与探索》2007,(10)

应用软件FCG(MTS Fatigue Crack Growth TestW are)采用七点递增多项式局部拟合的方法,计算疲劳裂纹扩展速率da/dN,导致计算值分散度很大。经过详细分析,提出采用正交多项式的线性组合作为疲劳裂纹长度a与载荷循环数N之间关系的拟合目标函数,再用直接求导的方法计算da/dN。这样减小了da/dN的分散度,提高了Paris公式参数拟合和门槛值计算的精度。  相似文献   

重视教师在幼儿游戏中的作用     

贾霞萍  丛玉燕 《太原教育学院学报》2004,22(2):68-72

游戏是幼儿期的主要活动，它对幼儿的身心健康起着重要影响。游戏能否在最大程度上实现其价值，主要取决于教师在游戏中所起的作用。针对真正意义上的游戏在教育实践中的贯彻，教师在幼儿游戏中应明确认识，帮助幼教工作者在幼儿游戏中真正促进幼儿身心的健康发展。  相似文献   

Approaches to Study and the Quality of Learning. Some Empirical Evidence from Engineering Education     

Vidar Gynnild  John Tyssedal  Lisa Lorentzen 《International Journal of Science and Mathematics Education》2005,3(4):587-607

In the late 1990s failure rates in a first-year introductory calculus course at the Norwegian University of Science and Technology reached peak levels. This paper reports on findings from an action research project that was set up in 2002/2003 to improve the situation. The study confirms that students approach their tasks differently which contributes to qualitatively different learning outcomes. Furthermore, patterns of achievement in mathematics and physics in secondary education keep reoccurring in the calculus course, even though the teaching and learning contexts are different. The paper does not provide any definite answer as to why groups of students get involved in distinctly different learning processes, and it will take further research to decide the nature of commitment to the learning tasks. However, inspired by the notion of ‘practices’ this paper raises a discussion about the role of intentionality in learning processes. When doing mathematics, students are also in a process of being engaged in and developing a practice. It is a major challenge for academic staff to contribute to communities of practice that are conducive to learning.  相似文献   

试析中国公务员考核制度的激励功能--兼谈考核制度存在的问题与改进对策     

岳林琳  王关锋 《武汉职业技术学院学报》2006,5(1):42-45

分析了公务员考核制度的激励功能以及存在的主要问题,提出了改进我国公务员考核制度的对策和建议。  相似文献   

Accounting for Model Uncertainty in the Prediction of University Graduation Rates     

Cullen F. Goenner  Sean M. Snaith 《Research in higher education》2004,45(1):25-41

Empirical analysis requires researchers to choose which variables to use as controls in their models. Theory should dictate this choice, yet often in social science there are several theories that may suggest the inclusion or exclusion of certain variables as controls. The result of this is that researchers may use different variables in their models and come to disparate conclusions with respect to predicted effects and their statistical significance. In such cases one is uncertain of which particular set of regressors forms the model that represents the data. The approach used below accounts for uncertainty in variable selection by using Bayesian model averaging (BMA). Accounting for uncertainty, we demonstrate that BMA provides better out-of-sample prediction for university graduation rates than results based on alternative variable selection methods.  相似文献