Archaeomagnetic investigation of a metallurgical furnace in Pisa (Italy)

An archaeological excavation has been carried out at Pisa (Italy), unearthing an ancient metallurgical workshop. Since archaeological burnt materials provide important records of direction and intensity of the Earth's magnetic field in the past and they can be used to better improve geomagnetic secular variation curves (SVCs), an archaeomagnetic study has been performed. This small copper-alloy furnace presents a circular concave shape covered with a thin layer of mortar, with some traces of heated clay surrounding the feature that confirms the high temperature reached inside it. Archaeological context dating points to the last firing of the furnace between the last quarter of the 13th century and the first quarter of 14th century AD, when then the metallurgical workshop was transformed in a warehouse. Archaeomagnetic sampling has been performed using the modified Thellier method, by collecting several, large and independently oriented aliquots of heated clay, forming the bottom part of the circular wall of the structure. Laboratory treatments have been conducted at the IGG-CNR ARCHEO_LAB (Pisa, Italy) and at St. Maur Palaeomagnetic laboratory (Paris, France). Analytical measurements of the thermo-remanent magnetization index acquired from the samples have been performed using a large cell induction magnetometer for large samples, and the characteristic remanent magnetization (ChRM) has been successfully isolated after an alternate field demagnetization cleaning procedure for each sample. The final mean archaeomagnetic direction has been calculated at sampling site (D = 6.9°; I = 52.8°; N = 9; k = 305; α₉₅ = 2.6°) following the Fisher Statistics, and it exhibits a perfect agreement with some coeval already published directions obtained from Mt. Arso lava flows, these latter being an important anchor point in the preliminary Italian secular variation curve. Comparison with the preliminary Italian SVC, the French SVC and the SCHA.DIF.3K archaeomagnetic regional model have permitted to define an archaeomagnetic absolute age confirming the conventional archaeological age, underlining the importance of this result into the Italian archaeomagnetic data set.     

R&D drivers and age: Are young firms different?

This study examines the relationship between R&D drivers and firm's age, taking into account the autoregressive nature of innovation.     

Feedback about more accurate versus less accurate trials: differential effects on self-confidence and activation

One purpose of the present study was to examine whether self-confidence or anxiety would be differentially affected byfeedback from more accurate rather than less accurate trials. The second purpose was to determine whether arousal variations (activation) would predict performance. On day 1, participants performed a golf putting task under one of two conditions: one group received feedback on the most accurate trials, whereas another group received feedback on the least accurate trials. On day 2, participants completed an anxiety questionnaire and performed a retention test. Shin conductance level, as a measure of arousal, was determined. The results indicated that feedback about more accurate trials resulted in more effective learning as well as increased self-confidence. Also, activation was a predictor of performance.     

Dealing with errors in mathematics classrooms: Structure and relevance of perceived error climate

Errors are often perceived by students as self-threatening and not as learning opportunities. The present work focuses on contextual influences on reactions to errors and learning processes. Based on prior research, a conceptualization of perceived error climate in the classroom with eight subdimensions and one superordinate uniform factor is proposed and a newly developed student questionnaire for its assessment is presented. Results of a study with N = 1116 students from 56 mathematics classrooms in German secondary schools indicated the validity of the error climate conceptualization and the suitability of the questionnaire. Moreover, the results showed that perceived error climate in the classroom predicted the adaptivity of students’ individual reactions to errors above and beyond perceived classroom goal structures and personal achievement motivation (academic self-concept, mastery goal orientation). In addition, the study provided evidence that perceived error climate affects – partially mediated through students’ individual reactions to errors – the quantity and self-regulation of students’ effort.     

The Narrative Approach in Art Education: A Case Study

This case study takes as its focus the work of the Fine Art graduate Dumile Johannes Ndita, who visually narrates his experience of life in contemporary South Africa. The artist graduated from Border Technikon, East London, an institution which teaches the narrative approach. It is the aim of the authors to illustrate how this method enables students to transfer lived experience into image. The three voices in this paper come from different backgrounds. The artist will explain the meaning of his drawings, the teacher will give background information on the community and culture in which he himself and the artist operate and outline teaching methods. Students taught by this method create work that has impact and meaning beyond the confines of the art school. To argue this point, the theoretician will add her voice and reflect on meta‐narratives presented in Dumile Johannes Ndita's drawings. Intricate inter‐textual patterns, shared and interconnecting institutional narratives tie our individual voices to those of the wider community and culture of present‐day South Africa and beyond.     

The teacher work sample: A tool for scaffolding and assessing preservice teachers' early field experiences

Abstract

This article describes adapting teacher work sample methodology from the student teaching level to a 4‐week, 25‐hour field experience occurring relatively early in a teacher education program. The goals of the project were twofold: (a) to examine whether an adapted version of the teacher work sample would promote planning and reflection in preservice teachers, and (b) to explore the potential of an adapted teacher work sample as an assessment tool. Adaptations to the original, such as emphasizing formative over summative assessment, are briefly described. Survey and focus group data from a pilot combined with survey data from a semester of full implementation with 270 teacher candidates indicate the teacher work sample is useful for promoting reflection and an understanding of student assessment. The advantages of the teacher work sample are maximized when teacher candidates are engaged in whole class instruction.     

The influence of situational emotions on the intention for sustainable consumer behaviour in a student-centred intervention

Within the curriculum guidelines for Bavaria, we designed a hands-on educational programme for teaching sustainability with regard to agriculture, food and consumerism, partly implemented on a farm as an out-of-school learning setting. The participants were fifth graders (N?=?176). The research followed a quasi-experimental design and used the subscale consumerism of the General Ecological Behaviour Scale and situational emotions (interest, well-being, boredom) to focus data collection activities. The study monitored the students’ knowledge increase and their Inclusion of Nature in Self (INS) scores as possible influencing factors on environmental behaviour. After participation in the programme, while we found that the students intended to consume in more environmentally friendlier ways, this intention did not persistent over a seven-week time span, nor did it relate to the INS or knowledge scores. There was, however, a high correlation with positive situational emotions like interest (r?=?.46, p???.001) and well-being (r?=?.39, p???.001), and a negative correlation with boredom (r?=??.42, p???.001). We conclude that the ‘effect’ of the programme immediately measured after the intervention was strongly linked to situational (short-term) emotions, and should be considered in educational planning as well as the evaluation of sustainability teaching and learning.     

STUDYING THE SOCIAL HISTORY OF TELECOMMUNICATIONS

This article proposes a methodology for studying the social history of telecommunications grounded in the interrelations and contaminations between Anglophone and Continental literature; its originality lies in the fact that it presents and discusses both traditions. Before tackling the central theme, the reasons for studying the history of telecommunications will be discussed and three different approaches will be considered. The first is the constructivist approach which, examines ‘relevant social groups’ and their decisions regarding telecommunications. The second is socio-economic and considers both path dependence theories and concepts useful in understanding the network economy: natural monopolies, economies of scale, externalities and public services. Finally, the macro-systemic approach will be considered. In our proposal these three approaches, deriving from both the Anglophone and Continental schools of thought, form a methodological basis for studying the history of telecommunications.