Three Contrasting Pairs’ Collaborative Programming Processes in China’s Secondary Education

Pair programming is a collaborative learning mode to foster novice learners’ computer programming. Previous empirical research has reported contrasting conclusions about the effect of pair programming on student learning. To further understand students’ pair programming, this study uses a mixed method to analyze three contrasting pairs’ collaborative behaviors, discourses, and perceptions from a multi-dimensional perspective. The analysis results show that the high-ranked student pair is characterized as the interactive, socially-supportive, and goal-oriented pair; the middle-ranked student pair is characterized as the highly-interactive, socially-supportive, and process-oriented pair; and the low-ranked student pair is characterized as the lowly-interactive, socially-unsupportive, and programming-distracted pair. The research reveals complex relations between collaborative behaviors, discourses, and performances, which have critical influences on students’ pair programming quality. Based on the results, this research proposes pedagogical, analytical, and theoretical implications for future instructional design, learning analytics, and empirical research of collaborative programming.

Calculation of two-dimensional scattering patterns for oriented systems

A versatile procedure to calculate two-dimensional scattering patterns of oriented systems is presented. The systems are represented by a set of dummy atoms with different scattering length densities, which allows the construction of very complex shapes either for single particles or for sets of particles. By the use of oriented pair distance distribution functions it is possible to perform a fast calculation of the scattering intensity from the oriented system in a given direction in the scattering vector (q) space and generate the two-dimensional scattering pattern on a givenqplane. Several examples of the calculations are presented, demonstrating the method and its applicability. The presented results open new possibilities for the analysis of scattering patters obtained from oriented systems.