以异步讨论辅助语言与内容知识的学习

文章介绍了以异步讨论辅助语言与内容知识的学习,探索了在具体实施中所应注意的问题,对语言学习者和教师具有极大的意义。     

浅议学习“三相异步电动机定子绕组磁动势”的方法

阐述了学习"三相异步电动机定子绕组磁动势"的方法:从单相绕组的磁动势入手,掌握其波形、数学表达式,进而用数学推导和图解法得出三相绕组磁动势。     

Educating science teachers in the twenty-first century: implications for pre-service teacher education

Abstract

This study examines the verbal interactions among a group of pre-service teachers as they engaged in scientific discussions in a medicinal chemistry course. These discussions were part of the course that encompassed an explicit instruction of scientific argumentation structures as well as an applied component, whereby the pre-service teachers learned the content of medicinal chemistry through cases developed using the strategy of competing theories. By adopting a case study approach using sociocultural framework of learning, we examined the interactions between the pre-service teachers using video data. We describe 12 possible forms of interactions during discussions – (1) seeking clarification, (2) figuring out loud, (3) sharing information, (4) agreement, (5) asking questions, (6) providing explanations, (7) raising strategic and procedural issues, (8) stating claims, (9) disagreement, (10) sharing perspectives, (11) offering alternatives, and (12) persuasion. The pre-service teachers engaged in figuring out aloud and seeking clarifications frequently, and used persuasion least in their discussions. To clarify their ideas and thoughts, pre-service teachers commonly rebut their counterparts and used warrants to support their own assertions. A similar pattern was also observed when figuring their thoughts out loud. Our findings suggest that pre-service teachers were able to carry out rebuttals in the argumentation process. However, the quality and function of their rebuttals can be improved by deepening their understanding of the subject matter knowledge and the science argumentation structure. Implications are discussed.     

未成年人适用取保候审问题的探讨

在中国，未成年人适用取保候审问题在立法和司法实践上皆存在不足，而对该问题的研究也一直处于被漠视甚至遗忘的角落。完善未成年人取保候审制度应当重新认识取保候审的性质及未成年人在取保候审适用上的特殊性，并采取相应的措施。     

When Topics are Controversial: Is it Better to Discuss Them Face-to-Face or Online?

Ten students in a graduate-level course on Historical and Policy Perspectives in Higher Education held face-to-face and online discussions on five controversial topics: diversity, academic freedom, political tolerance, affirmative action, and gender. Upon completion of each discussion, they assessed their comfort, honesty, concern for others’ feelings, similarity of feelings to others, and willingness to disagree and then compared the face-to-face and online discussions on these measures. Students’ assessments are complex and indicate that some topics did elicit feelings of discomfort, concern for others’ feelings, and willingness to disagree in the face-to-face discussions. However, despite these feelings, the majority of students continued to prefer the face-to-face discussions. Online discussions were valued to a lesser extent, but a consistent minority of students were more comfortable in that setting. The age and race of the student also created differences in responses. Dr. Katrina Meyer is an associate professor of Higher and Adult Education at The University of Memphis. Her Ph.D. is from the University of Washington, and her research interests include online learning and virtual universities.     

2-甲基丙烯醛与1,3-丁二烯的Diels-Alder反应的理论研究

运用密度泛函理论对2-甲基丙烯醛与1,3-丁二烯之间的反应进行了理论计算,计算结果表明反应碳-碳键的形成是同时、不同步进行的。     

用折算法分析异步时序电路

针对异步时序电路时钟信号不同步的特点,引入折算时钟变量,导出了电路中各触发器对基准时钟的统一状态方程,由此状态方程出发并按一定的步骤进行,能使异步时序电路的分析得到简化。     

运用ATM高速网技术建立多媒体CAI课室

ＡＴＭ是目前最先进的网络交换技术，它使网上实时传输声音、视频图像成为可能，在多媒体ＣＡＩ方面具有广阔的应用前景。汕头大学率先引进了ＩＢＭＡＴＭ２５．６Ｍ的桌面系统，并在多媒体ＣＡＩ课室的建立和应用上取得初步成效。同时，介绍多媒体ＣＡＩ课室的建立及课件的开发     

异步教学法在普通高校网球教学课中的应用研究

现阶段的体育教学工作较传统教学发生了巨大的变化,多功能、多目标以及多元化是现代体育教学的一个重要特点。现阶段的体育教学工作针对培养学生综合能力提出了更多的要求,教师在教学过程中如何更好的完成新时期的教学任务,是教师工作的重要研究方向。在普通高校的网球教学当中,应用异步教学法已经成为了其教学工作中的重要组成部分。本文对于异步教学法在普通高校网球教学课中的应用进行了研究与分析。     

Lorenz混沌异步跟踪深度伪装网络攻击信号最优检测

提出采用Lorenz混沌系统异步跟踪优化期望最大化高斯混合模型算法实现对低信噪比下深度伪装的网络攻击信号最优检测。通过提取待检测网络数据流参数向量和正常数据流参数向量的差值为特征,使用高斯混合模型并与期望最大化算法相结合,设计Lorenz混沌异步跟踪检测算法,对网络数据流进行建模和检测。仿真结果表明改进的检测算法能有效去除不是攻击信号的伪峰,相比Hough变化检测算法,能更加正确地检测非法攻击信号,信噪比为-15dB下,不同异步攻击中的检测概率就能达到100%,实现检测性能最优,尤其适用于信噪比极低的深度伪装网络攻击环境中对攻击信号的检测。研究成果为网络安全防御及应用具有巨大的理论参考价值。