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The present study focuses on the development of two sub-concepts necessary for a complete mathematical understanding of rational numbers, a) representations of the magnitudes of rational numbers and b) the density of rational numbers. While difficulties with rational number concepts have been seen in students' of all ages, including educated adults, little is known about the developmental trajectories of the separate sub-concepts. We measured 10- to 12-year-old students' conceptual knowledge of rational numbers at three time points over a one-year period and estimated models of their conceptual knowledge using latent variable mixture models. Knowledge of magnitude representations is necessary, but not sufficient, for knowledge of density concepts. A Latent Transition Analysis indicated that few students displayed sustained understanding of rational numbers, particularly concepts of density. Results confirm difficulties with rational number conceptual change and suggest that latent variable mixture models can be useful in documenting these processes. 相似文献
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文章将个性化学习和协同学习的教育理念结合起来,提出了一个基于数据融合技术的协同学习系统框架,以解决协同学习中个体学习目标往往得不到实现的问题。 相似文献
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The need to equip science teachers with knowledge, skills, and habits of mind to face the challenges of teaching science through
inquiry informed this study, which analyzed the secondary science intern teachers’ beliefs about inquiry before, during, and
following a series of 2 consecutive science methods courses in an attempt to document the effect of such experiences on their
ability and willingness to infuse science inquiry in their science curricula. Nine science credentialing interns participated
in the study. Data was gathered from their written reflections and various assignments throughout the methods courses. Results
suggested that their beliefs changed significantly after the science methods courses. The implications of the study to secondary
science teacher educators and researchers were highlighted. 相似文献
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According to the Communicative Ecology Model of Successful Aging (CEMSA), how people talk about age can have implications for how they cope with aging later in life. However, most research on communication and successful aging has focused on older adults. In this study, we use latent class analysis to profile how younger adults (age 18–39) communicate about aging and examine how these profiles relate to their attitudes toward aging (affect, efficacy, anxiety, and perceptions of successful aging). Consistent with past research on older adults, we found three distinct profiles of communication behavior (disengaged, engaged, and bantering). An engaged profile was clearly associated with the most positive attitudes toward aging, while a disengaged profile was associated with the least positive attitudes. These findings suggest that patterns of talk about aging may start early in life, underscoring the importance of studying communication about aging across the lifespan. 相似文献
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本文以中文WindowsNT4．0服务器为平台,详细介绍无盘DOS和Windows95工作站技术。讨论安装中遇到的问题及其解决的办法。 相似文献
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《European Journal of Sport Science》2013,13(3):183-190
Abstract In this study, we investigated the effect of 1- and 3-week tapering periods on concentrations of plasma testosterone (T), cortisol (C), T/C ratio, mood state, and performance in elite male cyclists. After 8 weeks of progressive training, cyclists were randomly assigned to a control group (n=12) who continued performing intense training for a further 3 weeks, or a taper group (n=12) who continued with a 50% reduction in training volume. Blood testosterone and cortisol concentrations were assayed and the T/C ratio calculated from analysis obtained via standard ELISA. Mood state was determined using the Profile of Mood States (POMS) questionnaire. All data were collected immediately after a 40-km time-trial performed before, during, and after the 8-week training protocol and after the 1- and 3-week tapering/training periods. In the taper group, 40-km time-trial time decreased significantly (P<0.01) and equally for both the 1- and 3-week taper periods relative to the control group. There were significant elevations in T/C ratio (P<0.001) and reductions in cortisol concentrations and POMS scores in the taper group relative to the control groups at the end of both the 1- and 3-week tapering periods. Hence, taper periods are effective in improving performance and mood state and elevating the blood T/C ratio. 相似文献
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Takashi Umeda Kazuhiro Suzukawa Ippei Takahashi Yousuke Yamamoto Masaru Tanabe Arata Kojima 《Journal of sports sciences》2013,31(9):897-904
Abstract To clarify the physical and mental fatigue caused by intense exercise and the relationship between the two types of fatigue, we examined changes in anthropometric and biochemical variables, neutrophil function, and the Profile of Mood States (POMS) questionnaire in 13 female university judoists attending a one-week training camp. Blood glucose, total cholesterol, haemoglobin, leukocyte count, IgG, and phagocytic activity all decreased after the training camp compared with baseline (P ≤ 0.046). Aspartate aminotransferase, lactate dehydrogenase, creatine kinase, and neutrophil oxidative burst activity increased after the training camp (P ≤ 0.007). Of the POMS scores, that for Fatigue increased after the training camp (P = 0.041) and that for Vigour decreased (P = 0.042). The changes in several POMS scores correlated with the changes in blood biochemical variables. In particular, the change in Total mood disturbance was negatively associated with changes in myogenic enzymes (P ≤ 0.032). Our results suggest that intense exercise during training camps for female judoists leads to the appearance and accumulation of mental and physical fatigue, which are related to each other. 相似文献
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Sarama Saha Chandan Sarkar Subhash Chandra Biswas R. Karim 《Indian journal of clinical biochemistry : IJCB》2008,23(3):262-266
Abnormal lipid profile is often found in women with Polycystic Ovary Syndrome. To assess the impact of abnormal lipid profile
on atherosclerosis in young Polycystic Ovary Syndrome women, carotid intima-media thickness as judged by B-mode ultrasonography
were done in 30 young (18–35 yrs) Polycystic Ovary Syndrome women and in similarly age-matched 30 apparently healthy controls.
Compared to controls, young Polycystic Ovary Syndrome women had significantly elevated serum total cholesterol, triglyceride
and LDL-C levels and carotid intima-media thickness. HDL-C level did not differ significantly between two groups of women.
In Polycystic Ovary Syndrome women carotid intima-media thickness was positively correlated with serum total cholesterol,
triglyceride and LDL-C and negatively correlated with serum HDL-C. Our study suggests that even young Polycystic Ovary Syndrome
women are prone to atherosclerosis from early age. 相似文献
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一种有效的形成性评价方法——美国的成长记录袋制度述评 总被引：1，自引：0，他引：1
传统的评价,一直被认为是对教师教学情况和学生学习情况的检验和考察,是教学后教师和考试人员的工作。美国的成长记录袋制度向我们提供了一种新的评价视野和评价方法,告诉我们形成性评价是教学过程的一个组成部分,是对教师教学和学生学习情况的一种反馈;有效实施成长记录袋制度有利于教学的改进,使学生参与到评价中来,有利于学生的自我调整和进步。 相似文献