Parametrization of the solvent action on modern artists' paint systems

A solvent action parametrization scheme has been developed combining relevant parameters of the solvent action on modern artists' paints to characterize the solvation and dissolving properties of different binding media. The new system combines different concepts used in solvent chemistry. It is based on the normalized and solute-dependent dimension [hδ_H + eE_T(30)cv]^N. It comprises a polarity value E_T(30)cv as the magnitude of the enthalpy, and a combined value representing the cavitation energy δ_H as an entropy-influencing factor. Forty-eight solvents were divided into five subgroups based on their interaction and structural properties. This binary scheme permits to reliably quantify spaces of efficiency. The graphical selectivity of the scheme was applied to four binding media systems (oil, alkyd, acrylic-, and acrylic-polystyrene) by determination of the swelling capacity of 48 solvents. The graphical visualization of the systematic parametrization of solvents permits one to judge the intermolecular interaction and other effects of solvation relevant to the restoration of painted artwork.     

Relational integration as a predictor of academic achievement

The current study aimed at applying a broad model of cognitive functions to predict performance in science and language courses at school as well as performance in a science course at university. We hypothesized that performance in science courses was predominantly related to the cognitive function known as relational integration, whereas performance in language courses should be best explained by individuals' short-term memory capacity. The sample consisted of 161 German undergraduate students who were asked to complete 33 cognitive tasks. School grades were also obtained. The analyses revealed that relational integration incrementally explained variance in science grades. Short-term memory acted as a predictor of language grades. However, mental speed was also substantially related to language grades. Predicting university exam scores revealed that short-term memory yielded an incremental predictive power. We conclude that academic performance requires different cognitive functions depending on a domain of study.     

How and why do students of higher education participate in online seminars?

Online education is continuing to gain popularity in educational institutions and organizations. Hitherto, most research has occurred at aggregated levels, while few researchers have studied how and why individuals participate in online education. It is essential to examine individual perceptions and relationships in order to understand how students behave in relation to others. This paper investigates how students of higher education participate in online seminars and why they participate in certain ways. An online class that attended asynchronous and synchronous online seminars was studied. Electronic logs were used to examine how students participated and interviews were used to illustrate why they participated. It was revealed that the participation of students varied between aspects such as exchanging information, managing tasks and providing social support and the emphasis of these aspects were related to the tool they communicated through. A number of participation inhibitors were identified and it was also suggested how these inhibitors can be addressed.     

Globalisation and education for sustainable development: exploring the global in motion

The article explores education for sustainable development (ESD) as a policy concept in different spaces and how it is re-articulated as part of a process of globalisation. The objective is to explore empirically an alternative set of logics in order to conceive of this process of globalisation. With this objective in mind, the article investigates articulations of ESD and sustainable development in Vietnamese and Thai policy-making, and reflects upon how these articulations can be seen to relate to globalisation. In so doing, it addresses concerns about the globalising potential of ESD within the field of environmental education research, and aims to open up for an alternative understanding of the processes associated with the rearticulation of ESD in different national education policy settings. The alternative conception that is put forward promotes an understanding of these re-articulations of ESD as contingent, opening up a space for contestation and counter-hegemonic articulations.     

Mind the gap: Dewey on educational bridge‐building

This is the first of four commentaries discussing John Dewey's short essay, ‘Education as engineering’. The essay provides a fascinating model of how the example of engineering could guide the interaction between educational research and practice. It has much in common with Herbart's ideas on how ‘pedagogical tact’ bridges the gap between theory and practice. Re‐introducing both Dewey and Herbart's ideas could help to overcome the current naivity of ‘evidence‐based’ school improvement.     

Cognitive ability and personality variables as predictors of school grades and test scores in adolescents

The predictive power of cognitive ability and self-control strength for self-reported grades and an achievement test were studied. It was expected that the variables use of time structure, academic procrastination, and motivational interference during learning further aid in predicting students’ achievement because they are operative in situations of school-leisure conflict. A sample of 697 eighth-graders was tested twice within the interval of a single school year (about eight months). Cognitive ability and self-control explained substantial variance of grade changes. Procrastination displayed a further portion of the variance. Personality variables were better predictors of grades, while cognitive ability showed higher variance with the achievement test. Variables tapping aspects of self-control strength have been interpreted as key determinants of learning outcomes. The findings suggest that it might be useful to identify students who are at risk, allowing these students to train their ability to shield studying from leisure distractions.     

Globalisation and education for sustainable development: emancipation from context and meaning

This article tries to contribute to the critical debate on the ideological and globalising potential of education for sustainable development (ESD), which exists in the research field of environmental education, by highlighting potential contradictions in the argumentation for ESD’s ideological and globalising tendency. Further, the authors of this article argue for an alternative perspective on how education policy on ESD can be seen to contribute to globalisation and homogenisation by merging two conceptualisations of ‘globalisation as connection' and the role of ‘empty signifiers' in political discourse. The ambition with the merger is not to provide a universal explanation of globalisation and ideology, instead, the intention is to outline an alternative theoretical outlook that allows for an empirical study of the processes that can be seen to feed into or interrupt the preservation of hegemony in a global setting.     

A Classroom Study on the Relationship Between Student Achievement and Retrieval-Enhanced Learning

Retrieval practice has been shown to produce powerful learning gains in laboratory experiments but has seldom been explored in classrooms as a means of enhancing students’ learning of their course-relevant material. Furthermore, research is lacking concerning the role of individual differences in learning from retrieval. The current study explored the effects of retrieval in a large undergraduate introductory biology course as a function of individual differences in student achievement. Students completed in-class exercises that required them to retrieve course information (e.g., recalling definitions for terms and labeling diagrams) followed by feedback or to simply copy the information without retrieving it. A later quiz over the information showed that high-performing students benefited more from retrieving than copying, whereas middle- and low-performing students benefited more from copying than retrieving. When asked to predict their quiz scores following the in-class exercises, high-performers demonstrated better overall metacognitive calibration compared to middle- or low-performers. These results highlight the importance of individual differences in learning from retrieval and encourage future research using course-relevant material to consider the role of student achievement in classroom-based interventions.