Moving toward a grand theory of development: in memory of Esther Thelen

This paper is in memory of Esther Thelen, who passed away while President of the Society for Research in Child Development. A survey of Esther Thelen's career reveals a trajectory from early work on simple movements like stepping, to the study of goal-directed reaching, to work on the embodiment of cognition, and, ultimately, to a grand theory of development--dynamic systems theory. Four central concepts emerged during her career: (1) a new emphasis on time; (2) the proposal that behavior is softly assembled from the interaction of multiple subsystems; (3) the embodiment of perception, action, and cognition; and (4) a new respect for individuality. Esther Thelen communicated these ideas to scientists and practitioners alike, so the ultimate benefactors of her work were children.     

Development of a spatially uniform low-temperature hydrogen combustor

Examples of the use of additive manufacturing and rapid prototyping in a range of applications are of great interest in order to emphasize their role in development and production technology. In this study, a catalytic low temperature burner for H₂ on a lab scale with an integrated flow distributor was designed, manufactured, and tested for functionality. Based on a theoretical approach, a flow distributor for the burner was designed and a prototype was built using fused deposition modeling (FDM). Based on test results, an optimized version of the burner was then designed and manufactured using selective laser melting (SLM). The functionality of the designed catalytic burner was proven. Several advantages were found in comparison to conventional non-catalytic burners. In particular, flameless uniform low temperature heat generation with temperatures of about 200 °C could be realized. This contribution highlights the potential of additive manufacturing in chemical engineering. Not only was the final product built using SLM, but also during the development process, FDM was used for rapid prototyping.     

博洛尼亚进程中的欧洲国际学生流动

为打破欧洲各国的高等教育边界,欧洲各国于1999年签署了《博洛尼亚宣言》,由此启动了博洛尼亚进程。目前,欧洲各国教育部长们在推动旨在促进学生流动的学习项目方面达成了共识,一方面,吸引欧洲以外的学生到欧洲国家修读学位项目,另一方面促进欧洲内部的短期学生流动。虽然该政策的效果评估面临各种问题,但有些大体趋势依然可见。首先,博洛尼亚进程有助于促使欧洲以外的学生到欧洲学习,但对促进欧洲内部的学生流动作用不大。其次,到毕业为止,学生频繁向外流动的情形超出了很多学者的预期,但也因国家而异。最后,由于学生流动的排他性式微,其价值逐渐减小。     

Research on the relationships between higher education and the world of work: Past achievements, problems and new challenges

The review of major research approaches and themes suggests that research on the relationships between higher education and the world of work has been closely linked during the recent three to four decades to changing themes of policy and practise. There were some indicators of research in this area being an agent of subordination of higher education to the employment system, being quantitative-structurally biased, tending to reproduce the actors' myths and being stuck in the over-education debate. A closer look, however, reveals that the range of research approaches is very broad and that a common core of themes and approaches emerged which provides the opportunity of examining controversial hypotheses. It is finally suggested that research in this area should be based on anticipation of likely changing conditions in the future, e.g. trends towards precarious or flexible employment, towards a mass or abundance paradigm, towards a 'life-long learning society' and towards an 'international' or 'global' labour market.     

Predicting adolescent truancy: The importance of distinguishing between different aspects of instructional quality

Little is known about the association of classroom characteristics with adolescent truancy. A critical question is whether high achievement standards, high workload, and fast pace protect against or increase adolescent truancy. In this study, self-reports from 3491 Swiss grade 7, grade 8 and grade 9 students in 202 classes were used to predict truancy. Multilevel modeling was used to differentiate between the student and the class levels. High achievement standards were associated with a lower truancy rate at both the student and the class level, whereas fast instructional pace was associated with more truancy at both levels. A perception of the workload as being too low was an additional predictor of high truancy at both the student and the class level.