Use of Polarised Light Microscopy to Improve Conservation of Parchment

ABSTRACT

The preservation state of parchment primarily depends on the structure of the collagen fibre network, which in turn is responsible for optical anisotropy, i.e. birefringence. Polarised light microscopy can therefore be used as a non-invasive technique that allows recording of birefringence distribution in the parchment, which directly relates to stress–strain distribution. Using samples from diverse sources (commercial parchment, parchment used by restorers for book binding, and parchment fabricated for the purpose of this study), we assessed the capability of polarised light microscopy for various diagnostics. We performed, for instance, identification of gelatinised regions, layered or ?brous regions in parchment cross section, qualitative analysis of parchment fat content (lipids), observation of stress-induced patterns resulting from tensile tests, and observation of water diffusion. These proof-of-principle experiments extend the capability of polarised light microscopy far beyond its common use and open the path to its deployment in conservation studies.     

Effective special teacher characteristics: perceptions of preschool special educators in Greece

The aim of the present study was to evaluate six characteristics of effective special pre‐school teachers, similar to those used in the relevant literature. The study participants were all special teachers (n = 226), serving in Greek state and community pre‐primary educational institutions (i.e. kindergartens and day nurseries) for children with learning disabilities. Data were collected through a two‐part questionnaire sent to the targeted special teachers (response rate 100%) and through focused group discussion with teachers. Three characteristics emerged as salient features of an effective teacher: love for the children; competent pre‐service training and ongoing professional development; and professionalism and commitment. The remaining three characteristics assessed (i.e. effective communication skills, a well‐rounded personality, and instructional ability) were also judged to be essential. Based on each characteristic’s analysis, the paper discusses the implications of pre‐service and in‐service training for special teachers.     

A cross‐cultural comparison of childhood developmental disorders between schoolchildren in the Netherlands and Greece

The scope of the present study was first to evaluate the cross‐cultural reliability and validity of the Social Emotional Questionnaire (SEQ) and second to estimate and compare the prevalence rates of childhood developmental and psychiatric disorders in the general population of young children in the Netherlands and Greece. To this end, the caregivers of 1748 Dutch and 384 Greek 4–12‐year‐old children from the general population completed the SEQ. The number of children displaying symptoms of childhood developmental disorders was estimated by applying the Diagnostic and Statistical Manual of Mental Disorders‐IV criteria of symptom occurrence. Results showed that the reliability and the construct validity of the SEQ were acceptable in both countries and for all the age‐groups of children. Concerning the prevalence, the Greek children were found to display overall significantly more symptoms of developmental disorders than the Dutch children. However, when the number of children suffering from psychiatric symptoms in the clinical range was estimated using the clinical criteria provided by categorical classification systems, no statistical significant differences emerged between the two countries. This finding suggests that when the criterion of clinical impairment is applied in diagnostic procedures, the number of children suffering from severe psychiatric disorders is about equal in the two countries. The implications of the study are discussed.     

Study of Teacher Practices in Health Sciences in Brazil

Abstract

This study involved fourteen semistructured interviews with teaching staff at a Brazilian university. These interviews were aimed at unveiling possible transformations caused by distance education in classroom teaching and in medical assistance practices. The discourses collected were analyzed using qualitative methods and divided into groups with convergent meanings, resulting in the following units: Infrastructure, Personal Use of Information Technology Resources, Impressions of Distance Education, Intensity of Dedication, Interactivity, Benefits of Distance Education, Teaching Practices, and Changes in Assistance. Results suggest that virtual teaching has resulted in positive changes in the professor–student relationship that allow improvements in interactivity and the creation of different expectations from those observed in classroom practice. There was a significant appropriation of the technological resources and pedagogical activities used in online courses for classroom teaching practice. Also observed was the transfer of knowledge to the personal and medical assistance spheres.     

Making the Case for Differentiated Teacher Effectiveness: An Overview of Research in Four Key Areas

Research into teacher effectiveness has traditionally attempted to uncover generic characteristics of effective teachers. However, recently the realisation that teacher effectiveness may be differentiated across different domains has gained recognition. In this article, we propose that researchers and policy-makers develop more differentiated models of teacher effectiveness. An overview of research is given that looks at whether there is evidence for differentiated effectiveness in four areas: different subject and curriculum areas, pupil background and ability, pupils' personal characteristics, and different teacher roles.     

The Learning Consortium: A School‐University Partnership Program. An Introduction

ABSTRACT

Induction experiences of beginning teachers in schools that were classified as more effective or less effective on the basis of student achievement are compared. Classroom observations, interviews, and a “Beginning Teacher Questionnaire” were used to obtain information from teachers in the two groups. Three areas of socialization were examined: assistance, monitoring, and team‐building. Results indicate that historically more effective schools were more supportive of their beginning teachers. In addition, outcome data regarding teacher performance provides evidence of more effective teaching among teachers in more supportive schools, even though initial teacher effectiveness, levels of experience, and educational attainment were not different for the two groups.     

Knowledge and Technique in Statistical Problem‐Solving

Summaries

English

Subjects’ knowledge and technique in statistical problem‐solving, as well as their ability to detect their own problem‐solving errors, were studied. Twenty subjects were asked to solve two statistical problems, and then to explain their solutions to the experimenter. Finally, each subject was asked successively more detailed questions about his/her solution, particularly in reference to its erroneous parts. The results showed that subjects tended to describe rather than explain their solutions. Subjects eliminated three errors (4%) when accounting for their solutions and another 20 errors (24%) in the following interview. About one‐third of all errors were analysed as being due to deficiencies in subjects’ problem‐solving techniques. For 62% of the errors where subjects showed knowledge deficiencies, there were deficiencies in propositional knowledge, i.e. in subjects’ understanding of statistical concepts and their interrelations. The results showed that misunderstandings of concepts and methods of solution were much more common than lack of conceptions as such. In addition, the results suggest that deficiencies in subjects’ problem‐solving are related to motivational factors, such as a tendency to minimize cognitive strain. Pedagogical implications of the results are discussed.