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We applied a true-experimental randomized control posttest design to collect and analyze quantitative and qualitative data to compare the effects of the AR and traditional board games on students’ SDG learning achievements.

We applied a true-experimental randomized control posttest design to collect and analyze quantitative and qualitative data to compare the effects of AR and traditional board games on students' SDG learning achievements.

Our analysis of the quantitative and qualitative data revealed that the effects of AR and traditional board games on the students' cognitive outcomes differed significantly, indicating the importance of providing a situated learning environment in SDG education. Moreover, the students perceived that the incorporation of the AR game into SDG learning improved their learning effectiveness – including both cognitive and affective dimensions – thus confirming its educational value and potential in SDG learning.

To the best of our knowledge, this is the first study to explore the effectiveness of different learning tools (AR and traditional board games) and to evaluate the importance of providing a situated learning environment through a true-experimental randomized control posttest design.

The purpose of this paper is to track the changes of leadership attributes during the process of social development from 1998 to 2008 in China, and then to explore whether the significant events have potential impacts on the changes of leadership attributes during this time.

The authors conducted two studies through qualitative approach, based on data collected from Chinese official newspapers (People's Daily and Guangming Daily) covering 216 stories (90 stories in Study 1 and 126 stories in Study 2). The first study focuses on comparing the leadership attributes in 2008 with those in 1998 and 1988 presented in previous research to find out the changes. In the second study, the most significant events are selected during the period of 1998‐2008 and their effects on the changes of leadership attributes are examined.

The findings show that leadership attributes changed during the ten years and some new attributes are advocated in China. Furthermore, the changes of leadership attributes, especially for non‐business leaders, relate to the occurrence of significant events and reflect the changes of government policies.

Although some literature has explored leadership attributes in China, this study contributes to the extant research in two ways. First, it promotes the use of existing documents as data sources of longitudinal study to track the changes of leadership attributes. Second, it advances the line of inquiry of leadership attributes in China by concentrating on the factors driving those changes.

This paper aims to distinguish the relationship between the morphology characteristics of different scales and the contact performance of the mating surfaces. Also, an integrated method of the spectrum analysis and the wavelet transform is used to separate the morphology characteristics of the actual machined parts.

First, a three-dimensional (3D) surface profilometer is used to obtain the surface morphology data of the actual machined parts. Second, the morphology characteristics of different scales are realized by the wavelet analysis and the power spectral density. Third, the reverse modeling engineering is used to construct the 3D contact models for the macroscopic characteristics. Finally, the finite element method is used to analyze the contact stiffness and the contact area of the 3D contact model.

The contact area and the nominal contact pressure Pn have a nonlinear relationship in the whole compression process for the 3D contact model. The percentage of the total contact area of the macro-scale mating surface is about 70 per cent when the contact pressure Pn is in the range of 0-100 MPa, and the elastic contact area accounts for the vast majority. Meanwhile, when the contact pressure Pn is less than 10MPa, the influence factor (the relative error of contact stiffness) is larger than 50 per cent, so the surface macro-scale morphology has a weakening effect on the normal contact stiffness of the mating surfaces.

This paper provides an effective method for the multi-scale separation of the surface morphology and then lays a certain theoretical foundation for improving the surface quality of parts and the morphology design.