Calcium sulfate fillers and binders in Portuguese 15th and 16th centuries: Ground layers from a family painting workshop — Study by multianalytical spectroscopic techniques

This study presents results on a developed methodology to characterize ground layers in Portuguese workshops. In this work a set of altarpieces of the 15th and 16th centuries, assigned to Coimbra painting workshop was studied, overall the masters Vicente Gil (doc. Coimbra 1498–1525), Manuel Vicente (doc. Coimbra 1521–1530) and Bernardo Manuel (act. c. 1559–94), father, son and grandson, encompassing from late gothic to mannerist periods. The aim of the study is to compare ground layers, fillers and binders of Coimbra workshop, and to correlate their characteristics to understand the technical evolution of this family of painters, using complementary microscopic techniques. The cross-sections from the groups of paintings were examined by optical microscopy and the results were integrated through the analysis obtained by μ-X–ray diffraction, scanning electron microscopy with energy dispersive X–ray Spectrometry, μ-confocal Raman and occasionally with μ-Fourier transform infrared spectroscopy imaging. Ground layers are of calcium sulfate, present as gesso grosso (mainly anhydrite with small amounts of gypsum) in the first and last phases of the workshop and gesso mate (mainly gypsum with small amounts of anhydrite) in an intermediate period. Binders have protein and oleic characteristics.

STUDENT’ S ENGAGEMENT IN SCHOOL: A LITERATURE REVIEW

Students’ Engagement in School has been the focus of debate concerning academic success and school dropout, and pointed out as a mean to address the problems affecting our schools and their students, not only for having value in itself, but also for being an important mediator between several academic variables. This paper reviews the research and literature on this concept and its relations with personal and contextual variables, as well as with academic performance, with the aim of summarizing the main relationships found. Literature presents a significant number of studies which sustain that personal variables, such as self-efficacy and self-concept, as well as contextual - peers, school, family- are related with school engagement. The adoption of mastery goals, for instance, has a positive impact on school, as they are related with the use of cognitive and self-regulatory strategies by students. Positive relationships with peers, teachers support and the quality of family relations are associated with higher levels of engagement and academic performance, while negative experiences, such as bullying, are related with educational difficulties. Following this, we reflect about the relevance of studying engagement in school, in the context of widespread financial crisis, and emphasize the need to rethink educational institutions considering the paradigmatic changes that currently occur.

Students´ Engagement In Schools: Differentiation and Promotion

The objective of this work is to present elements of the project Student engagement in Schools (SES). The team consists of 10 researchers from six Universities. Student engagement in schools is a multidimensional construct that unites affective, behavioural, and cognitive dimensions of student adaptation in the school and has influence on students‘outcomes. The team of researchers conceptualized two major studies, a differential study to analyze the relations between SES and contextual factors, personal factors, student’s outcomes, and a quasi-experimental study to analyze the effects on SES of a specific intervention programmes. In study 1, the sample size is around 600 students (150 6th graders, 150 7th graders, 150 9th graders, and 150 10th graders). We shall focus on years of school transition, with rural and urban populations, on different regions of the country, and on students with different family background. We shall conduct questionnaires with national and international scales. The study 2 will involve students in 7th and 9th grade, from four classes, two of the experimental group and two of the control group. Patterns of verbal communications between a teacher and students can influence the classroom environment and SES. This model of communication would result in more effective student management and more time on-task for learning.

Engagement e interferência trabalho-família em cônjuges trabalhadores e não trabalhadores na mesma organização

Baseada na literatura sobre a interferência trabalho-família e o engagement, esta investigação estudou diferenças nestas variáveis em indivíduos com cônjuge trabalhador na mesma organização vs. cônjuge não trabalhador na mesma organização. Foram aplicados dois questionários a uma amostra de 91 participantes, que permitiram concluir que o primeiro grupo apresenta níveis superiores em todas as dimensões de ambas as variáveis, sobretudo na dedicação. Foram ainda estudadas diferenças em variáveis sócio-demográficas, assim como foi demonstrado a correlação significativa entre as dimensões do engagement, e entre o vigor e a interferência trabalho­família negativa. São discutidas implicações teóricas e práticas, assim como limitações do estudo e direcções futuras. /ABSTRACT: Based on the literature about work-home interference and engagement, this investigation studied differences on those variables in individuals with their spouses working on the same organization vs. spouses don't working on the same organization. Two questionnaires were applied to a 91 sample, that allowed us to conclude that the first group presents higher levels in every dimension of both variables, especially on dedication. Differences in socio-demographics variables were also studied, and it was demonstrated significant correlation between engagement dimensions, and between vigour and negative work-home interference. Theoretical and practical implications are discussed, as well study limitations and future directions.