Teaching Through Collaboration: Flexibility and Diversity in Caregiver–Child Interaction Across Cultures

Teaching supports the high-fidelity transmission of knowledge and skills. This study examined similarities and differences in caregiver teaching practices in the United States and Vanuatu (N = 125 caregiver and 3- to 8-year-old child pairs) during a collaborative problem-solving task. Caregivers used diverse verbal and nonverbal teaching practices and adjusted their behaviors in response to task difficulty and child age in both populations. U.S. caregivers used practices consistent with a direct active teaching style typical of formal education, including guiding children’s participation, frequent praise, and facilitation. In contrast, Ni-Vanuatu caregivers used practices associated with informal education and divided tasks with children based on difficulty. The implications of these findings for claims about the universality and diversity of caregiver teaching are discussed.     

Participatory Action Research and Critical Race Theory: Fueling Spaces for Nos-otras to Research

Drawing on the intersections of a justice oriented participatory action research and critical race theory, this essay explores the possibilities for research embedded in the theoretical, ethical and methodological overlaps between the two. Using the Echoes project as a case study, a participatory collective of intentionally diverse youth from New York and New Jersey brought together in the long shadow of Brown, to document and perform educational injustice in their schools, the essay asks social scientists what it means to engage research that takes seriously the idea of mutual implication, or what Anzaldúa (Borderlands/La Frontera, The New Mestiza, 1999) calls nos-otras—whereby research is designed to seek knowledge at the nexus of everyday lived experience and intricate social systems; to ask questions that allow individuals to hold multiple, even opposing, identities; to provoke analyses that requires historical re-memory; to destabilize naturalized power hierarchies. Research that calls for socially engaged questions that demand to be answered collectively through research and action.

An Enquiry into the Influence of Mathematics on Students’ Choice of STEM Careers

Australia currently faces a skill shortage in Science, Technology, Engineering and Mathematics (STEM) professions unlikely to improve if the current trend of low enrolments in high-level mathematics in secondary school continues. Many factors seem to contribute to this trend, and amongst them, research recognises student attitudes towards mathematics and careers in STEM. Research also shows that teachers and classroom practices are key agents to change these attitudes. This paper examines teachers’ perceptions of students’ attitudes towards mathematics and careers in STEM, as well as classroom practices emanating from those perceptions. Combining data from two studies, a large-scale survey and an intervention, we argue three main points: (1) student attitudes and teachers’ perceptions of those attitudes quite clearly differ, (2) targeted interventions showing links between mathematics and careers in STEM can have an influence on students’ perceptions of STEM careers and (3) an implementation of classroom ability grouping based on standardised test scores can be disadvantageous to students who have a natural inclination towards STEM and positive attitudes towards mathematics.     

Back to Africa: Tracing Dyslexia Genes in East Africa

A sample of Swahili-speaking probands with reading difficulties was identified from a large representative sample of 1,500 school children in the rural areas of Tanzania. Families of these probands (n = 88) were invited to participate in the study. The proband and his/her siblings received a battery of reading-related tasks and performance on these tasks was recorded and treated as phenotypic data. Molecular-genetic analyses were carried out with 47 highly polymorphic markers spanning three previously identified regions of interest harboring susceptibility loci for reading difficulties: 2p, 6p, and 15q (DYX1–DYX3). The analyses revealed the involvement of these regions in the development of reading difficulties in Swahili. The linkage signals are especially pronounced for time (compared with error) indicators of reading difficulties. These findings are easily interpretable because in transparent languages such as Swahili deficits in reading are more related to the rate/speed of reading and reading-related processes than to the number of errors made. In short, the study incrementally advances the field by adding an understudied language and an understudied population to the variety of languages and populations in the field of molecular-genetic studies of reading difficulties.     

Quality of Chilean Early Childhood Education from an International Perspective Qualité de l'Education Préscolaire Chilienne dans une Perspective Internationale Calidad de la Educacio´n Preescolar Chilena desde una Perspectiva Internacional

The aim of the study was to assess the quality of the different types of Chilean early childhood care and education programmes according to international standards. The sample included 120 centres representing the different types of pre-school programmes available, randomly selected from two different geographical regions of the country, where 52% of the population lives. This paper presents the structural and process characteristics observed in the classrooms, according to the results from the application of the Early Childhood Environment Rating Scale (ECERS). All the different types of pre-school programmes in Chile exhibited a minimum level of quality, even though there are differences among types of programmes and also according to the geographical area where they were settled. Results are compared with findings from the European Child Care and Education (ECCE) study developed in Austria, Germany, Portugal and Spain and from the Effective Provision of Pre-school Education (EPPE) project, developed in Britain. Cette étude se propose de évaluer la qualitédes différents programmes d'éducation et soin d'enfants au Chili, selon des standards internationaux. 120 centres ont été selectionnés au hasard, dans les deux départements du pays ou habite le 52% de la population. Cet article analyse les caractéristiques structurelles et du procès observes dans les classes, selon les résultats obtenus avec l'application de l'Early Childhood Environment Rating Scale (ECERS). Les différents types de programme on montré un niveau minimal de qualité même s'il y avait de différences significatives parmi les programmes et les départements. Les résultats sont compares avec l'étude European Child Care and Education (ECCE) développeé a le'Autriche, dans l'Allemagne, au Portugal et en Espagne et avec ceux projet Effective Provision of Pre-school Education (EPPE), développe a l'Angleterre. El propósito de este estudio fue la evaluación de la calidad de los diferentes programas de Educación y cuidado infantil existentes en Chile, aplicando criterios internacionales. La muestra incluyó 120 centros que representan los diferentes tipos de programas existentes en el país, seleccionados al azar, en las dos regiones, en las que habita el 52% de la población total. Este artículo analiza las características estructurales y del proceso observadas en las salas, de acuerdo a los resultados de la aplicación de la Early Childhood Environment Rating Scale (ECERS). Los distintos tipos de programas mostraron un nivel de calidad promedio correspondiente al rango minimo, aunque existen diferencias significativas entre ellos y también entre las dos regiones. Estos resultados fueron comparados con los hallazgos de los estudios-European Child Care and Education (ECCE), desarrollado en Austria, Alemania, Portugal y Espana y Effective Provision of Pre-school Education (EPPE), realizado en Inglaterra.     

Design procedure for thin three-layer plates made of a depleted material

The efficiency of a long-span structure relies on how material is locally distributed within a fixed structural shape. In this paper a design procedure for thin plates made of three layers of a depleted material subject to a distributed vertical load is proposed. The investigation is driven by the idea of the optimal material organization and has the objective of maximizing the overall stiffness/weight ratio of the structure. Two microstructural architectures of the media are considered: a porous solid structure and a truss arrangement. For each type of microstructure the flexural stiffness has been correlated to the level of depletion by the use of a power law function by setting very few parameters. Finally, invoking the principles of structural homogenization theory, the global flexural response of the plate has also been calculated. The validity of the method is demonstrated by comparing the analytical results with those obtained by a numerical finite element simulation of the structure based on a detailed model of the media.     

The logic of practice in the practice of logics: practicing journalism and its relationship with business in times of technological changes

This paper investigates the workings of institutional logics in practice, by focusing in particular on the interplay between material, practical and linguistic dimensions of practices. In other words, drawing on Bourdieu's sens pratique, the paper explores the logic of practice in the practice of logics through a six months full-time ethnographic study at Il Sole-24 Ore, the largest Italian financial newspaper, between 2007 and 2008. An original conceptual framework is developed to analyse how the logic of journalism is enacted vis-à-vis that of advertising in a setting in which an old technology for news production – print newspaper – coexists with a new one – website – and thus encounters between new and old technological possibilities make workings of institutional logics particularly visible. The findings point out different mechanisms of institutional work dealing with actions that, made possible by new technological possibilities, are potentially, but not necessarily classified as divergent from institutional logics.     

Study of the deterioration products,gilding, and polychromy of the stones of the Scuola Grande Di San Marco's façade in Venice

The Scuola Grande di San Marco is one of the most outstanding Renaissance buildings in Venice. Destroyed by fire in 1485, the Scuola was reconstructed between 1487 and 1495 by Pietro Lombardi (and sons), together with Giovanni Buora and Mauro Codussi. The façade is considered one of the finest and most original exteriors of Venetian buildings and in particular features refined sculptural and painted decorations and a remarkable pictorial effect created by the extensive use of polychrome marbles and the false perspective view between the pilasters of the lower order. Most of the stone materials (Istrian and Verona red limestones, nero di Roveré, pavonazzetto toscano, Carrara marble and various reused antique marbles) present evident decay phenomena such as scaling, exfoliation, powdering, fissuring, salt efflorescence, black crusts, and artificial patinas of various kinds. The present study reports the results of petrographic and chemical laboratory analyses carried out in preparation for the conservation treatment of the building, in order to characterize the main micro- and macro-morphologies of decay and to identify the causes and mechanisms of deterioration as well as the nature and application technique of the polychromy, gilding, and patinas present on parts of the monumental Renaissance façade.     

Resistance to carbonation of concrete after re-alkalization by absorption of sodium carbonate solution

The paper presents experimental research on the durability of a non-conventional technique for the repair of reinforced concrete damaged by carbonation-induced corrosion of steel reinforcement. The technique is called electrochemical re-alkalization and is often considered as an option for the repair of buildings, structures, and other artefacts made of reinforced concrete, for which conservation requirements are becoming increasingly important, in spite of their relatively young age. Absorption of a sodium carbonate solution is one of the processes that lead to concrete re-alkalization. The aim of the work is to investigate the contribution of this process to preventing future carbonation of re-alkalized concrete. Concrete specimens with six different compositions were initially carbonated, then re-alkalized through absorption of a sodium carbonate solution, and then exposed again to carbonation (re-carbonation). The results showed that the pH of concrete after re-carbonation was only slightly lower compared to that of re-alkalized concrete, highlighting a contribution of the treatment in preventing future pH reduction.     

Lexical Semantic Field as One of the Keys to Second Language Teaching

The article is devoted to the problem of the development of skills connected with the acquisition of foreign lexis (Lexis = all possible words or phrases in a language) on the basis of semantic fields (Semantic field = a lexical set of related items, e.g., colour, red, green, blue). This becomes possible due to grouping well-known and unknown to the students lexical units to systemized semantic groups—semantic fields. Semantic fields can be useful for the quantitative and qualitative enrichment of the vocabulary; they serve to choose a lexical unit correctly, to collocate lexical units according to existing norms, to use the lexis of various semantic fields in different contexts without mistakes, to guarantee conscious, automatic language skills of the students and to increase their active vocabulary.