Positive teacher–student relationships go beyond the classroom,problematic ones stay inside

The authors voice teachers' perceptions of their interpersonal experiences with students in both positive and problematic relationships. Interview data from 28 teachers were examined by coding utterances on teacher and student interactions. Results indicate that teachers defined the quality of the relationship mostly by the level of communion (friendly vs. hostile), instead of by the level of agency (in control vs. powerless). Analyses of mentioned teacher and student behavior show a friendly interactional pattern for positive relationships and a hostile pattern for problematic ones. In teachers' perceptions, positive and problematic relationships also differed in context where encounters take place and topic of talk. Contrary to interactions in problematic relationships, encounters in positive relationships were mostly situated outside the classroom context and conversations during these encounters covered a wide range of topics. Implications for teacher education programs are discussed.     

Variation in Valuation: How Research Groups Accumulate Credibility in Four Epistemic Cultures

Minerva - This paper aims to explore disciplinary variation in valuation practices by comparing the way research groups accumulate credibility across four epistemic cultures. Our analysis is based...     

Effect of different swim caps on the assessment of body volume and percentage body fat by air displacement plethysmography

Isothermal air trapped in scalp hair generates an underestimation of body volume when it is measured by air displacement plethysmography. The aim of this study was to examine the effect of wearing different types of swim caps on the measurement of body volume and percentage body fat by air displacement plethysmography. It was hypothesized that wearing a silicone swim cap would more thoroughly compress scalp hair compared with a lycra swim cap, yielding higher estimates of body volume and percent body fat. Thirty female participants aged 25.7 ± 6.4 years were measured in random order when wearing no swim cap, a lycra swim cap or a silicone swim cap. For the no-cap versus lycra cap condition, the mean bias for body volume was -0.579 ± 0.380 litre (limits of agreement: -1.340 to 0.181 litre) and for percent fat -4.9 ± 3.1% fat (limits of agreement: -11.2 to 1.3% fat) (P < 0.05). For the silicone versus lycra condition, the mean bias for body volume was 0.137 ± 0.099 litre (limits of agreement: -0.062 to 0.335 litre) and for percent fat 1.2 ± 0.9% fat (limits of agreement: -0.5 to 2.9% fat) (P < 0.05). In conclusion, attention should be paid to optimal compression of isothermal air trapped in scalp hair when using air displacement plethysmography. The present results suggest that this compression may be more thorough when wearing a silicone swim cap.     

Kindergarten child care experiences and child achievement and socioemotional skills

Young children's experiences outside of both home and school are important for their development. As women have entered the labor force, child care has become an increasingly important context for child development. Child care experiences prior to school entry have been well-documented as important influences on children's academic and socioemotional development. However, less is known about the importance of non-parental, out-of-school care for young school-age children's development. Using a nationally representative sample of kindergartners (n = 16,888), this study examined the relationship between child care experiences during the kindergarten year and children's academic and socioemotional skills. Given that the amount of time available for child care is by definition related to the type of kindergarten a child attends, differences in the relationship between child care and child development were explored separately by full- and part-day kindergarten. Results showed that across both types of kindergarten, more hours of center care during the kindergarten year were associated with small improvements in math test scores for all children. Any center child care during the kindergarten year was associated with increased problem behavior and decreased prosocial skills, even after accounting for a large number of confounding factors. Differences by family income and child gender were also investigated. Implications for policy and practice are discussed.     

Lead soaps in paintings: Friends or foes?

The origin(s) and role(s) of metal soaps in paints are a worldwide concern today. These hybrid compounds, containing both fatty acid chains and metals associated with a carboxylate function, are increasingly identified in paints. As reviewed in the first part of this work, the presence of metal soaps in paints is differently interpreted in scientific publications: metal soaps are sometimes considered to play a positive role as anchor points, during paint drying processes; they can also be considered as responsible for many degradation processes (protrusions, efflorescences, darkening, etc.). Their origins are also interpreted in various ways. In some paintings (in particular from the twentieth century), they have sometimes introduced on purpose, as additives, to modify the physical properties of the painting materials. In older paintings, metal soaps are usually thought to result from an uncontrolled reaction of oil with lead-based pigments, in particular lead white, red lead, and lead tin yellow. In the second part of this work, the review of historical recipes of lead-based paint shows an important number of recipes based on controlled mixing of oil with lead driers. In the third part, the experimental reproduction of such traditional recipes using walnut oil and litharge (PbO) shows that lead soaps can be formed, both in about one hour at ～100°C, or in about one month at room temperature. It shows as well that after a few years, litharge is no longer detected in the paint medium, while different lead carbonates are. Finally, the micro-infrared spectroscopy and micro-X-ray diffraction re-analysis of protrusions from a nine-year model painting shows together with lead soaps, the presence of Pb₅(CO₃)₃(OH)₂O (‘synthetic plumbonacrite’), an unusual phase recently observed in a protrusion from a painting by Vincent Van Gogh. This work highlights (i) the multiple origins and roles of metal soaps in paints and (ii) the importance of combining the analysis of fragments from historical paintings with the analysis and reproduction of historical recipes. In particular, we show that the components detected today in historical paintings may severely differ from those originally used or prepared by the painter, complicating the assessment of the painter's intentions. More than the presence of metal soaps, the key questions to be tackled should be about their origins and (re)mobilization.     

Foreign Language Command: definition and description

The authors give a critical survey of the model of communicative competence underlying van Ek's Scope and Levels, written for the Council of Europe as a follow‐up of The Threshold Level of 1975‐76. Although generally in favour of van Ek's new approach, the authors find that van Ek's model lacks breadth of definition of strategic competence. This leads to some unclarity and confusion in van Ek's proposals. The authors also regret that van Ek does not allot a greater role to compensatory strategies in the assessment of levels of language command.

     

Linking theory and practice: teacher research in history and geography classrooms

The impact of scholarly research in education on the educational practice in secondary school is low. Academics examine problems that teachers in school perceive as irrelevant, want to publish in peer-reviewed journals instead of disseminate their work, and aim at generalizing insights rather than improving school practice. Teacher research might be a way to link educational academic research and teaching practice aiming at furthering professionalism in teaching, improving teaching practice and extending the knowledge base on teaching and learning. Four experienced secondary school teachers systematically investigated their classes, guided by a supervisor. Their materials as well as formal and informal communication with their supervisor and with each other were analysed. Related to their research projects, these teachers reported significant changes in their understanding of student learning and their teaching. They took different perspectives on teaching, looked at alternative solutions for problems, and reflected more deeply on their own teaching as well as teaching of their colleagues. Although each of them published an article in a peer-reviewed journal, they reported difficulties with extending the knowledge base on teaching and learning. Not only did they rarely share results with their colleagues in school because they were perceived as external researchers, they also struggled with writing journal articles and coping with peer reviews. We discuss the value of situated generalization as one of the implications and discuss how teacher research could lead to a new in-between research practice, linking theory and practice, and researchers and teachers.     

Methodological issues associated with longitudinal research: Findings from the Leuven Longitudinal Study on Lifestyle,Fitness and Health (1969 – 2004)

Abstract

Longitudinal studies provide unique opportunities but are also faced with several limitations. The purpose of this study was to document three of these issues (“imperfect” design, evolution of data collection methods, representativeness) by means of the Leuven Longitudinal Study on Lifestyle, Fitness and Health (LLSLFH). The LLSLFH (1969 – 2004) comprises observations on males between 12 and 18 years and at 30, 35, 40, and 47 years, and on females at 16 and 40 years. In the most recent phase of the study, spouses and offspring were also included. The different phases and evolving research questions throughout the LLSLFH required an appropriate adaptation of the research design. The associated evolution of data collection methods largely reflects the changing ideas about physical fitness, body composition, and physical activity, the continuing search for new and better measurement techniques, and the need for adaptations with age. Ongoing study participants are representative in terms of body composition and, except for adolescence in males, also physical activity. No straightforward answer can be given concerning physical fitness. In both sexes, socio-economic status is above average. When informed about the possible “pitfalls” of longitudinal research in advance, several measures could be taken to prevent or limit them as much as possible.