计算机管理教学(CMI)的未来

目前一个重要的,但是尚未发展起来的领域就是对计算机化教育及其培训的管理。本文探讨了当今二十年来计算机管理教学(CMI)系统的主要特征。本文描述的系统,从几个方面上与当今工业企业中流行的而且具有决定性意义的“追踪与报告”系统有本质的区别,并且本系统将对未来的计算机化教育与培训有着特别重要的意义。     

Race, ethnicity, and culture in child development: contemporary research and future directions

The editors of this special issue reflect on the current status and future directions of research on race, ethnicity, and culture in child development. Research in the special issue disentangles race, ethnicity, culture, and immigrant status, and identifies mediators of sociocultural variables on developmental outcomes. The special issue includes important research on normal development in context for ethnic and racial minority children, addresses racial and ethnic identity development, and considers intergroup processes. The methodological innovations as well as challenges of current research are highlighted. It is recommended that future research adhere to principles of cultural validity described in the text.     

Contribution of temporal processing skills to reading comprehension in 8-year-olds: evidence for a mediation effect of phonological awareness

This study tested whether the association between temporal processing (TP) and reading is mediated by phonological awareness (PA) in a normative sample of 615 eight-year-olds. TP was measured with auditory and bimodal (visual-auditory) temporal order judgment tasks and PA with a phoneme deletion task. PA partially mediated the association between both auditory and bimodal TP and reading, above nonverbal abilities, vocabulary, and processing speed. PA explained a larger proportion of the association between auditory TP and reading (56% vs. 39% for bimodal TP), and most of the association between bimodal TP and reading was direct. This finding is consistent with a dual-phonological and visual-pathway model of the association between TP and reading in normative reading skills.     

二次三项式的因式分解

二次三项式ax~2+bx+c在给定的范围内如何进行因式分解,这是中学代数的一个重要内容。当a=1时,可用“十字相乘法”进行判断和分解,而当a≠1时,用上法就比较麻烦。本文推广了a=1时的“十字相乘法”,对于a≠1的情形也能较方便地进行判断和分解,     

运用现代教育技术优化数学课堂结构

随着现代科学技术的发展,多媒体技术在我国的教育教学上的应用,使得教学手段、教学方法、教学观念与形式、课堂教学结构,以至教学思想与教学理念都发生了变革.多媒体技术运用于数学教学,通过图、文、声、视、动等独特功能将数学教学内容进行处理,使原本枯燥的数学课堂生动化,让学生在人机交互操作中学到数学知识.     

剩余活性污泥对水中Cr（Ⅵ）、Cd（Ⅱ）的吸附性能研究

以剩余活性污泥作吸附剂对水中Cr（Ⅵ）、Cd（Ⅱ）的去除进行了探讨。考察了pH值、吸附时间、吸附剂投加量和金属离子初始浓度对吸附去除率的影响。剩余活性污泥对Cr（Ⅵ）、Cd（Ⅱ）均遵循Langmuir等温线,且对Cr（Ⅵ））的吸附能力大于Cd（Ⅱ）。     

微营养素和肉品质量的关系

日粮中微营养素硒(Se)能够引起肌肉组织的生理变化,从而改变畜禽肉品的品质.本文着重阐明硒和VE在细胞膜和细胞质的抗氧化中独特应用,进而对肉品的形成和贮存过程中保持肉品的完整性起明显作用.