试论元散曲中的"四季歌"

元散曲中"四季歌"的题材内容、表现形式及与戏曲艺术构思方式上的相似性,显示了同一历史阶段中不同艺术形式相互影响、相互渗透的规律性现象.     

直觉图像思维模式仍然有启发力——为〈物理学与哲学之间〉作序

充分肯定了新创的量子力学曲率解释的优点，赞扬改进后的“相互作用实在论”，解决了不可知论的疑难。重点强调直觉图像思维模式对于理解量子物理学和对于科学创造的启发性功能。并用多元主义方法论的观点分析几种典型的量子力学解释，表明它们各有独特的一面。     

沸石模型簇与乙烯、氮气和甲烷相互作用的从头算研究

设计不同的超分子计算模型簇Z…X（Z=2TNa（[H3SiOAlH3]-Na^＋），3TNa（[H3SiOAl（H）2OSiH3]^-Na^＋）和4TNa（[H3SiOAl（H）2OSi（H）2OSiH3]^-Na^=），X=C2H4、N2和CH4），模拟计算C2H4、N2和CH4与沸石模型簇的相互作用．在HF／6—31G水平上对Z、X和复合物Z…X进行几何全优化计算得到优化构型，经MP2／6—31G＊电子相关能校正和基组重叠误差（BSSE）校正以获得相互作用能．结果表明，对于一指定X，随Z尺寸增大，复合物Z…X的相互作用能减小；对于一指定Z，复合物Z…X的相互作用能由大到小顺序为Z…C2H4〉Z…N2》Z…CH。．分子间相互作用的能量分解分析显示，静电能在Z…X相互作用能量中占主导地位，电荷转移能在Z…C2H4复合物体系中居第2位，而极化能在Z…M和Z…CH4复合物体系中居第2位。     

Evaluating item response theory linking and model fit for data from PISA 2000–2012

ABSTRACT

Based on concerns about the item response theory (IRT) linking approach used in the Programme for International Student Assessment (PISA) until 2012 as well as the desire to include new, more complex, interactive items with the introduction of computer-based assessments, alternative IRT linking methods were implemented in the 2015 PISA round. The new linking method represents a concurrent calibration using all available data, enabling us to find item parameters that maximize fit across all groups and allowing us to investigate measurement invariance across groups. Apart from the Rasch model that historically has been used in PISA operational analyses, we compared our method against more general IRT models that can incorporate item-by-country interactions. The results suggest that our proposed method holds promise not only to provide a strong linkage across countries and cycles but also to serve as a tool for investigating measurement invariance.     

Interactions and mergers of galaxies

When two galaxies approach each other, we can witness the effects of the tidal forces on a gigantic scale. Peculiar features like galactic bridges and galactic tails may form, or the two galaxies may even merge into each other and form a single system. Merger of two spiral galaxies leads to the formation of an elliptical galaxy. The interaction of gas during such galaxy encounters triggers star formation and activity of the nucleus. It is generally being accepted that galaxy interactions and mergers play a vital role in galactic evolution. S M Alladin is a retired Professor of Astronomy, Osmania University, Hyderabad. He specialized in dynamical astronomy and did research on dynamics of colliding and merging galaxies. He is also interested in interaction between religion and science. S N Hasan is an Assistant Professor of Astronomy, Osmania University, Hyderabad. His field of specialization is celestial mechanics. His research interests include the three body problem, stellar and galactic dynamics.     

Empirical Research into Teaching

The paper argues that 100 years of empirical research into teaching has failed to provide a usable account of best practice. This is partly because of conceptual and other logical problems that cannot in practice be resolved, as has been argued before. However, it is further argued that the real reason that no useful rules of good teaching can be established is that there are no substantive and important rules covering human interactions such as teaching. It is not that science cannot get the answers; rather it is that there are not any answers, and that is why there is not a science of teaching. Every teaching event is unique and the way to determine good practice is to be clear about what one is trying to achieve and to know one’s particular audience. This is not simply sound practical advice, but logically the only path to knowledge in this area.     

Cognitive regulations in ICT-supported flipped classroom interactions: An activity theory perspective

In recent years, most studies on flipped classrooms or flipped learning have focused on learners’ motivation, academic achievement and teachers’ and students’ perceptions of the flipped classroom. Little research has involved interactions in the flipped classroom. This study aims to show that in-class collaborative learning in the flipped classroom can not only be conceived as a collective activity consisting of discrete actions, but also as a systematic activity. From the activity-theoretical perspective, contradictions were found between components of an activity such as subject, tools, rules, community, division of labor, object and outcome. This study conducted a pre-experiment, selecting one lesson of the seventh-grade Information Technology Course as the learning content, conducted in a flipped classroom. Three triads with different compositions were specifically observed by recording their interactions. More second-level contradictions existed between subject and tools, and division of labor within the low-level triad than within the other two triads, and more first-level contradictions also occurred within the low-level triad than within the other two triads. Most second-level contradictions within the high-level triad were resolved by self-regulation of cognition. Instead, most second-level contradictions within the mixed-level triad were overcome by co-regulation or shared regulation of cognition. This study sheds light on how to effectively design and implement flipped learning, and provides a new approach for analyzing interactions in the classroom.     

The microworld of Phoenix Quest: social and cognitive considerations

The present paper explores social and cognitive considerations in the context of a computer-game microworld or learning culture environment. Forty-one boys and 57 girls, aged 8 to 12 years (Grades 4, 5, and 6) were observed playing a computer game called Phoenix Quest. This computer game, featuring an adolescent female protagonist, is an interactive, mystery-adventure with embedded language and mathematics activities. The issues discussed include (a) the development of a computer game learning culture or microworld, (b) interdependence in the process of learning social skills, (c) computer game-playing strategies, (d) gender differences in computer-game play, and (e) mathematics concepts explored in the Phoenix Quest environment. These findings not only contribute to the understanding of how students create and shape a microworld around a computer game like Phoenix Quest, but also indicate some of the inherent teaching and learning limitations of educational software when the guidance of a teacher is absent.     

Student and Teacher Perspectives in Computer-Mediated Learning Environments in Teacher Education

Rapid advances in technology, particularly with the Internet, have led to the availability of numerous tools to support teaching and learning. This study involved the use of an Internet application, Connecting Communities of Learners (CCL), in courses for prospective teachers. Unlike earlier studies involving the use of the CCL, the context of this study related to full-time graduate students who used the CCL to augment weekly face-to-face instruction. An interpretive study was undertaken to ascertain student and teacher perceptions of the learning environments associated with the use of the CCL. Through the use of the CCL, students were able to be autonomous in regard to their own learning, co-participate with their peers and the instructor, and establish and maintain a community of learners in which participants could interact with others as co-teachers and co-learners. The CCL was perceived as a useful tool for building learning environments in which all participants can contribute written texts as evidence of what is known and as objects from which others can learn. This revised version was published online in July 2006 with corrections to the Cover Date.     

Exploring student hand-raising across two school subjects using mixed methods: An investigation of an everyday classroom behavior from a motivational perspective

Student hand-raising is an everyday behavior in classroom interactions with teachers. This research presents two studies that examine the variance in hand-raising and its relation to student motivation in two school subjects, Mathematics and Language Arts. Student hand-raising is introduced as an indicator of behavioral engagement. Study 1 investigated N = 397 high school students in 20 classrooms during a videotaped lesson in each subject. Multilevel regression analysis suggests that student motivation accounts for significant variance in hand-raising. The results show subject-specific differences: Student self-concept predicts hand-raising in Mathematics, while students' situational interest predicts their hand-raising in Language Arts. Students’ externally regulated motivation is predictive across both subjects. In Study 2, N = 14 high school students were interviewed about their hand-raising behavior. The results validate and extend the findings from Study 1. Finally, this research emphasizes the importance of fostering student hand-raising and discusses the implications for future research.