Social-perspective coordination and gifted adolescents’ friendship quality

This research examined links among academic ability, social-perspective coordination, and friendship quality, within the context of gifted adolescents’ friendships. The sample consisted of 120 early adolescents (59 girls, 61 boys), 81 of whom were identified as gifted. Academic ability, sex, and grade significantly predicted social-perspective coordination (an indicator of psychosocial maturity) in multiple regression analyses. Social-perspective coordination, perceptions (self-concept) of ability to make and keep friends, academic ability, sex, and grade predicted perceptions of the overall quality of friendships. Being a female, seventh grader, or adolescent not identified as gifted, significantly predicted higher friendship quality. Social-perspective coordination and self-concept based on having a close friend predicted higher levels of friendship quality for the gifted participants.     

Simulation and experimental determination of the online separation of blood components with the help of microfluidic cascading spirals

Microfluidic spirals were used to successfully separate rare solid components from unpretreated human whole blood samples. The measured separation ratio of the spirals is the factor by which the concentration of the rare component is increased due to the Dean effect present in a flow profile in a curved duct. Different rates of dilution of the blood samples with a phosphate-buffered solution were investigated. The diameters of the spherical particles to separate ranged from 2 μm to 18 μm. It was found that diluting the blood to 20% is optimal leading to a separation ratio up to 1.97. Using two spirals continuously placed in a row led to an increase in separation efficacy in samples consisting of phosphate-buffered solution only from 1.86 to 3.79. Numerical investigations were carried out to display the flow profiles of Newtonian water samples and the shear-thinning blood samples in the cross-section of the experimentally handled channels. A macroscopic difference in velocity between the two rheologically different fluids could not be found. The macroscopic Dean flow is equally present and useful to help particles migrate to certain equilibrium positions in blood as well as lower viscous Newtonian fluids. The investigations highlight the potential for using highly concentrated, very heterogeneous, and non-Newtonian fluidic systems in known microsystems for screening applications.     

Anorexia athletica in pre-professional ballet dancers

Competitive sport has been under increasing discussion as a possible favourable factor in the development of eating disorders among children and adolescents. The aim of this study was to determine the frequency of sport-specific eating disorders, in line with the concept of anorexia athletica. This prospective field study included one experimental group and two control groups (disease and healthy). Fifty-two pre-professional ballet dancers aged 13-20 years were tested for clinical eating disorders, anorexia athletica criteria, eating disorder related psychopathology and self-concept, and were compared with 52 patients with anorexia nervosa and 44 non-athletic controls of the same age. The study was conducted using semi-structured interviews as well as self-report questionnaires. A clinical eating disorder diagnosis was made in 1.9% of the ballet dancers versus 0% of the high school students; anorexia athletica was diagnosed in 5.8% of the dancers versus 2.3% of the students. Ballet dancers scored lower than patients with anorexia nervosa with regard to eating disorder related psychopathology and higher than the patients with regard to self-concept. We conclude that more sensitive tools to differentiate between sport-specific (eating) patterns, anorexia athletica and clinically relevant eating disorders are needed, especially for aesthetic sports such as ballet. It remains an important goal to identify athletes with symptoms of anorexia athletica irrespective of their physique and/or sport.     

Testing Measurement Equivalence of Eudaimonic and Hedonic Entertainment Motivations in a Cross-cultural Comparison

Within Hofstede’s framework of individualistic and collectivistic cultures, this contribution examines measurement equivalence of hedonic and eudaimonic entertainment motivations in two different cultures, namely Germany representing a more individualistic culture (N = 180) and Turkey representing a more collectivistic culture (N = 97). By means of a multi-group confirmatory factor analysis, we could secure configural invariance for both hedonic and eudaimonic entertainment motivations across the German and Turkish sample. Metric invariance, however, could only be obtained for hedonic, but not for eudaimonic motivations. Scalar invariance was obtained for neither of the two entertainment motivations. The study points to the importance of equivalence testing when conducting cross-cultural research.     

Role of the educator in social software initiatives in further and higher education: A conceptualisation and research agenda

Higher and further education institutions are increasingly using social software tools to support teaching and learning. A growing body of research investigates the diversity of tools and their range of contributions. However, little research has focused on investigating the role of the educator in the context of a social software initiative, even though the educator is critical for the introduction and successful use of social software in a course environment. Hence, we argue that research on social software should place greater emphasis on the educators, as their roles and activities (such as selecting the tools, developing the tasks and facilitating the students' interactions with these tools) are instrumental in a social software initiative. To address this gap, we have developed a research agenda on the role of the educator in a social software initiative. Drawing on role theory, both as the basis for a systematic conceptualization of the educator role and as a guiding framework, we have developed a series of concrete research questions that address core issues associated with the educator roles in a social software context. We have provided recommendations for further investigations. By developing a research agenda, we hope to stimulate research that creates a better understanding of the educator's situation and develops guidelines to help educators carry out their social software initiatives. Considering the significant role an educator plays in the initiation and conduct of a social software initiative, our research agenda ultimately seeks to contribute to the adoption and efficient use of social software in education.     

The impact of new public management instruments on PhD education

New public governance emphasises less state, more market and more hierarchy as the cornerstones for effective steering of higher education institutions. Based on an explorative analysis of qualitative and quantitative data of fourteen German and European economics departments, we investigate the steering effects of six new public management instruments in the years 2001 and 2002 on subsequent placement success of PhD graduates. Using crisp set Qualitative Comparative Analysis to analyse the data, our results deliver strong support for the positive effects of competition for resources and the varying effects of hierarchy on PhD education. Governance of successful departments is characterised by two solutions: transparency over academic achievements as one single success factor in each solution or a combination of additional funding based on national competitive performance with either no public policy regulations for departments or no university regulations for departments. Governance of unsuccessful departments is characterised by one solution: university regulations for departments or a combination of no additional funding based on national competitive performance and no transparency over academic achievements. Our results strengthen the strong impact of selected competitive mechanisms as an effective governance instrument and the partially detrimental effects of state regulations. University regulations turn out to be successful if they increase transparency over academic achievements by faculty members. Success is unlikely if those rules intervene into PhD education.