High-Resolution Ultrasonic Imaging of Artworks with Seismic Interferometry for Their Conservation and Restoration

Artworks are an inseparable part of the cultural heritage of societies and provide us with a unique look at cultural developments through time and space. For the best possible conservation, it is paramount to know the constituent materials, condition, and construction techniques of the objects (e.g. painting on wood, fresco, sculpture). Such information is required not only for the surfaces of the objects, but also for the interiors; in the imaging discipline, this is known as depth imaging. Here, we introduce a new method for non-invasive depth imaging as an alternative to traditional non-invasive methods when the latter cannot be used to obtain the required information. We use ultrasonic transverse-wave transmission measurements and turn them into virtual reflection measurements. We achieve this by applying seismic interferometry with active sources. Obtaining reflection measurements by seismic interferometry allows us to apply an advanced imaging technique – prestack depth migration, as used in seismic exploration – to produce a high-resolution depth image of an object. We apply our method to ultrasonic data recorded on a mockup of a painting on a wooden support. We validate our method by comparing our results with an image from X-ray computed tomography.     

Attitudes towards being assessed in group work: The effects of self-efficacy and collective efficacy moderated by a short educational intervention

Being assessed in group work is a balance between cooperation and competition. Self-efficacy and collective efficacy are important concepts in understanding how group work progresses and what attitudes assessment evokes. The aim of the study was to investigate the effects of a short educational intervention on the association between efficacy beliefs and attitudes towards being assessed in group work. In a randomized, controlled study of 22 pupil work groups, half of them got a short educational intervention. The work groups were formed for this study. The pupils answered a questionnaire before the intervention and after doing group work for 3 to 6 weeks with a study-specific task. A moderated mediation analysis showed that attitudes towards being assessed in group work significantly are related to self-efficacy mediated through perceived collective efficacy and that this relationship is stronger in the intervention group. In the context of work group assessment, we have shown that self-efficacy and collective efficacy are two separate, but related concepts that are dependent on each other when it comes to pupil attitudes towards group work assessment, and that a relatively short educational intervention to teachers and pupils had an effect on the attitude. However, the older girls' attitude towards group work assessment was the least positive of all, which may indicate that the intervention depends on gender and age.     

Classroom Location,Activity Type,and Physical Activity During Preschool Children's Indoor Free-Play

Early Childhood Education Journal - Preschool children spend most of their day in the indoor classroom, but it is unknown which learning centers or activity types are associated with physical...     

“What’s in it for Me?” A Study on Students’ Accommodation or Resistance during Group Work

This article explores students’ accommodation and resistance while participating in group work. The data collected are from fieldwork observations in several classrooms over the course of four terms in different secondary school classes in Sweden, and also from interviews with the students. Through this data analysis, we report that the students accommodated for such reasons as amusement, compliance, fulfilling expectations, and striving for high marks. The reasons for students’ resistance were blending, inability, stage fright, and vagueness. Macro-sociological concepts from Ziehe's cultural theory were used to capture explanations for students’ behaviour in order to understand why students, on a micro-sociological level, accommodate or resist when using group work as a learning mode. On the basis of results, three models of interpretation were developed, namely, individual, institutional, and structural.     

Use of computers for educational purposes at the Wageningen Agricultural University (WAU)

Abstract

University teachers are increasingly confronted with the necessity of using information technology for educational purposes. University policy in the nineties should therefor include stimulation of the use of computers and of the development of educational software. This policy should be based on an assessment of the present use of computers in teaching and learning, and needs of university teachers. At the Wageningen Agricultural University (WAU) this assessment was made through a questionnaire presented to all teachers. The results show that approximately 40% of the teachers use computers for educational purposes, 30% are interested and 30% are indifferent. The main computer applications are in the field of educational tools and exploratory environments. It is concluded that university policy on the introduction of computer use should acknowledge the importance of 1) teacher initiatives 2) exploring the possibilities of information technology, 3) material resources, 4) coordination of different initiatives and 5) a supporting centre with expertise on the use and development of computer applications for educational purposes.     

Metadata Collaboration between the Swiss National Library and Research Institutions in the Field of Swiss Historiography

Abstract

This article presents examples of metadata collaborations between the Swiss National Library (NL) and research institutions in the field of Swiss historiography. The NL publishes the Bibliography on Swiss History (BSH). In order to meet the demands of its research community, the NL has improved the accessibility and interoperability of the BSH database. Moreover, the BSH takes part in metadata projects such as Metagrid, a web service linking different historical databases. Other metadata collaborations with partners in the historical field such as the Law Sources Foundation (LSF) will position the BSH as an indispensable literature hub for publications on Swiss history.     

Emotions and values – a case study of meaning-making in ESE

With an interest in the role of emotions and values in students’ meaning-making in Environmental and Sustainability Education a case study was carried out in a Swedish school-class with students, 12 years of age. During a six-week thematic group-work focusing environmental and sustainability issues related to food, the students were observed and interviewed in their daily school practice. The results are presented here through narrative reporting, and analysed with the use of Dewey’s theoretical perspectives on experience, distinguishing three phases in a process: a start, an activity phase and a closure. Martha Nussbaum’s theory of emotions is used to assist in the understanding of emotions and values. The study reports on active and independent meaning-making processes in students’ group work. The results provide examples of students’ meaning-making experiences and the role of emotions and values in them, indicating that more of values are formed and expressed in the concluding phase.     

Responding to university policies and initiatives: the role of reflexivity in the mid-career academic

How do academics make sense of university policies and strategic initiatives and act on them? Interviews were conducted with 27 mid-career academics in different disciplines, different research-intensive university environments and two countries (England and Australia). Data were analysed iteratively utilising a critical realist perspective, specifically, Archer’s modes of reflexivity. The paper argues that individuals’ responses to university policies and initiatives, to changes in policy and policy conflicts, can at least partially be understood through interrogating the modes of reflexivity they employ.     

Paths to reading comprehension in at-risk second-grade readers

Two studies of second graders at risk for reading disability, which were guided by levels of language and functional reading system theory, focused on reading comprehension in this population. In Study 1 (n = 96), confirmatory factor analysis of five comprehension measures loaded on one factor in both fall and spring of second grade. Phonological decoding predicted accuracy of real-word reading; automatic letter naming predicted rate of real-word reading; accuracy and rate of both real-word reading (more so than decoding of pseudowords) and text reading predicted reading comprehension; and Verbal IQ also predicted reading comprehension. In Study 2 (n = 98), the treatment group (before/after school clubs receiving an integrated instructional approach that was supplementary to the general reading program) improved significantly more in phonological decoding and state standards for reading fluency than the control group (general reading program that had some code instruction but emphasized comprehension). The rate of phonological decoding explained 60.3% of real-word reading. Both treatment and control children improved significantly in reading comprehension, but controlling for pretreatment individual differences in oral vocabulary or in phonological decoding eliminated this effect. Taken together, the results of the two studies support two paths to reading comprehension: one from vocabulary and verbal reasoning, and one from written language that has multiple links between subskills: (a) alphabetic principle --> phonological decoding, (b) automatic phonological decoding --> accurate real-word reading, (c) automatic letter coding ---> automatic word reading, and (d) automatic word reading --> fluent text reading. Instructional implications of both paths and the links within the written language are discussed.