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11.
Nicholas Emepue Kola Soyibo 《International Journal of Science and Mathematics Education》2009,7(2):339-361
This study was designed to assess whether the level of performance of selected Jamaican 11th-grade physics students on some
numerical problems on the energy concept was satisfactory and if there were significant differences in their performance linked
to their gender, socioeconomic background (SEB), school location, English language and mathematical abilities. The 331 sampled
students consisted of 213 boys and 118 girls; 197 students were from a high SEB and 134 students from a low SEB; 296 students
were from seven urban schools and 35 students from three rural schools; 112, 153 and 66 of the students had high, average
and low English language abilities, respectively, while 144, 81 and 106 of the students had high, average and low mathematical
abilities, respectively. An Energy Concept Test (ECT) consisting of six structured numerical questions was employed for data
collection. The results indicated that although the students’ level of performance was regarded as fairly satisfactory, there
was a lot of room for improvement. There were statistically significant differences in the students’ performance on the ECT
linked to SEB, and mathematical abilities in favour of students from a high SEB, and high mathematical abilities, respectively.
There was a positive, statistically significant but weak correlation between the students’ (a) mathematical abilities, and
(b) English language abilities and their performance on the ECT, while there were no correlations among their gender, school
location, and SEB and their performance on the ECT. 相似文献
12.
钟毅 《重庆第二师范学院学报》2012,25(1):147-150,162
词汇是语言学习的基础,是听力能力提高的关键。本文通过对英语专业学生的词汇与听力测试成绩的相关性进行研究,发现英语专业学生词汇能力与听力能力之间确实存在显著的正相关,本文通过对一例英语专业大二学生的听力成绩分析,对英语专业院校重视词汇在听力教学中的地位予以肯定,同时也对当前听力教学和词汇教学的结合提出几点建议。 相似文献
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14.
通过比较Leggett不等式和Bell不等式,研究了Leggett不等式中非定域项的特点,给出了非定域项在不同幂次下Leggett不等式的形式.发现在非定域项不同的幂次下,推广的Leggett不等式对应着不同强弱的两体关联,即关联的大小可由幂次δ的取值来标定.并对推广的Leggett不等式和Bell不等式在量子力学下破坏大小进行了比较,分析了破坏大小和非定域项的关系. 相似文献
15.
潘琪祥 《上海海事大学学报》1989,(1)
本文从误差的相关性出发,指出根据两条相关位置线确定的船位的等概率密度曲线也是椭圆,并且给出了均方误差椭圆要素的计算公式及均方误差的椭圆简易作图方法。 相似文献
16.
Student evaluation of teaching (SET) ratings are used to evaluate faculty's teaching effectiveness based on a widespread belief that students learn more from highly rated professors. The key evidence cited in support of this belief are meta-analyses of multisection studies showing small-to-moderate correlations between SET ratings and student achievement (e.g., Cohen, 1980, Cohen, 1981; Feldman, 1989). We re-analyzed previously published meta-analyses of the multisection studies and found that their findings were an artifact of small sample sized studies and publication bias. Whereas the small sample sized studies showed large and moderate correlation, the large sample sized studies showed no or only minimal correlation between SET ratings and learning. Our up-to-date meta-analysis of all multisection studies revealed no significant correlations between the SET ratings and learning. These findings suggest that institutions focused on student learning and career success may want to abandon SET ratings as a measure of faculty's teaching effectiveness. 相似文献
17.
李金寨 《宁德师专学报(自然科学版)》2011,23(3):239-242,246
介绍了在周期为偶数的情形,X．H．Tang等给出的4元序列自相关函数的理论界．其次,探讨周期为奇数的情形的4元序列的自相关函数值,通过编程给出了一些搜索结果．特别是,在较小规模的奇数周期的情形,通过穷搜索给出了最优的自相关函数值,为理论分析提供一定的依据和参考． 相似文献
18.
Michael Harwell Yukiko Maeda Kyoungwon Bishop Aolin Xie 《Journal of Experimental Education》2017,85(2):197-214
Measures of socioeconomic status (SES) are routinely used in analyses of achievement data to increase statistical power, statistically control for the effects of SES, and enhance causality arguments under the premise that the SES-achievement relationship is moderate to strong. Empirical evidence characterizing the strength of the SES-achievement relationship and its moderators suggests that this relationship is surprisingly modest, with an average SES-achievement correlation of .22, although it appears to have strengthened in the past 3 decades. The modest SES-achievement relationship has important implications for using SES measures in educational data analyses. We provide evidence of this relationship and of the need to use theoretical models to guide the construction and selection of SES measures in analyses of achievement data. 相似文献
19.
在扩展的LEPS势能面上,运用准经典轨线法在碰撞能为12 kcal/mol情况下对比研究Cl＋HH→HCl＋H,Cl＋HD→HCl＋D和Cl＋DH→DCl＋H反应。计算得到广义极化微分反应截面、k-j＇两矢量相关的p（θr）分布和k-k＇-j＇三矢量相关的p（φr）分布,计算结果与有关实验和理论符合得很好。同位素效应研究表明,质量因子在此类反应中起着重要作用。 相似文献
20.
杨纯斌 《中国科学院大学学报》2003,20(2):187-190
讨论关于自组织临界性的Bak-Sneppen模型中的涨落与关联.通过引入系统的平均适应性,从涨落中发现了系综平均后的适应性对格点大小的依赖性,并利用这种依赖性得到了间距方程的解及临界指数.讨论了演化过程中最小适应值的位置的跳变.在演化中,跳变的距离的分布在零值处越来越突出,这表明相邻两次更新中的最小适应值的位置间的关联越来越强.将最小适应值位置的跳变与一种时空关联联系起来,并得到了一个关联函数的简单表达式. 相似文献