‘Approaches to the Teaching of Special Relativity Theory in High School and University Textbooks of Argentina’

In this work, we presented an analysis of the representation of the special relativity theory (SRT) in the most used texts in high school, Polimodal level and university level in the teaching in the Argentine Republic, from a historic, epistemological and didactic perspective. The results show that none of the analyzed texts would allow a contextualized approach on such theory.     

Does an Emphasis on the Concept of Quantum States Enhance Students' Understanding of Quantum Mechanics?

Teaching physics implies making choices. In the case of teachingquantum physics, besides an educational choice – the didactic strategy – another choice mustbe made, an epistemological one, concerning the interpretation of quantum theory itself. Thesetwo choices are closely connected. We have chosen a didactic strategy that privileges the phenomenological-conceptualapproach, with emphasis upon quantum features of the systems, instead of searching for classicalanalogies. This choice has led us to present quantum theory associated with an orthodox, yet realistic,interpretation of the concept of quantum state, considered as the key concept of quantum theory,representing the physical reality of a system, independent of measurement processes. The results of theimplementation of this strategy, with three groups of engineering students, showed that more than a halfof them attained a reasonable understanding of the basics of quantum mechanics (QM) for thislevel. In addition, a high degree of satisfaction was attained with the classes as 80% of thestudents of the experimental groups claimed to have liked it and to be interested in learning more about QM.     

A Framework for Epistemological Discussion on Integrated STEM Education

Science & Education - In primary and secondary schools, the disciplines encompassed in “STEM”—Science, Technology, Engineering and Mathematics—have usually been studied...     

Mitigating Unintended Impacts? The Effects of Premiums for Underserved Populations in Performance-Funding Policies for Higher Education

Performance funding is an increasingly prevalent policy state officials use to allocate a portion of state funds to public colleges and universities. Researchers have begun to evaluate the effect of these policies, finding bleak evidence of their effectiveness in yielding intended outputs and suggesting the policies may even result in limited college access for underserved students. There may also be differences in policy effects depending on performance-funding policy designs, which vary considerably across states. Of particular interest to this study are premiums—financial bonuses to institutions—for promoting access and success for specified underserved student groups. Using difference-in-differences models and an original dataset on premiums in funding models, this study evaluates the impact of premiums for underserved students in performance-funding models on selectivity and the enrollment of minority and low-income students at 4-year universities from 1993 to 2014. We find that the share of both low-income and Hispanic students increases in institutions with performance-funding premiums for underserved students compared to institutions subject to performance funding without such premiums. Effects vary depending on premium type and longevity. The findings also reveal unexpected, negative effects of premiums on Black student enrollments. Our findings suggest that, by incorporating premiums, performance-funding model designers might prevent, minimize, or reverse the negative consequences of performance funding on vulnerable student groups. However, given variation in premium effects across student groups, performance- funding model designs should be tailored to local contexts.     

ComPratica: A Virtual Community of Practice for Promoting Biology Teachers’ Professional Development in Brazil

Teachers’ professional development is a key factor in improving science education, but it shows limited impact when only a small number of teachers is reached, or when it focuses on only one aspect of teachers’ development, such as learning science content, and is disconnected from teachers’ practice. In order to increase the impact of our work on teachers’ professional development, we implemented in 2007 ComPratica, an online network intended to establish a virtual community of practice involving biology teachers and biological education researchers. We present here the results of the first 2 years of this project, obtained through an analysis of the number and distribution of actions performed by the participants in the community, the kinds of activities in which they are engaged, and the themes addressed in their messages. From these data, we conclude that ComPratica is effectively functioning as a community of practice and is leading to changes related to both teachers’ and researchers’ professional development, which seem capable of reducing the research–practice gap in science education.     

Identification of natural dyes in historical textiles from Romanian collections by LC-DAD and LC-MS (single stage and tandem MS)

In this study, the dyes present in five 17th- to 18th-century textiles from the National Museum of Art of Romania, three religious embroideries and two brocaded velvets, are characterized and discussed, together with earlier results on textiles from Romanian collections obtained by the same research group. Dye analyses were performed using two methods: the well-established liquid chromatography-diode array detection (LC–DAD) and a recently developed liquid chromatography-mass spectrometry (LC–MS) analytical protocol. The examination of very small historical samples by both techniques allows a better insight in the advantages and limitations of the two approaches to real analyses to be obtained. LC–MS data interpretation is based entirely on the results accumulated for dye standards. Electrospray ionization (ESI) was used in the negative ion mode and an ion trap served as mass analyzer. Both single stage (MS) and tandem (MS/MS) mass spectrometric approaches were considered. The dyes and natural sources identified by both analytical techniques are discussed in the historical context of the textiles, with respect to earlier results collected for similar Romanian objects. The study showed that the dye sources found in the 17th- and 18th-century Romanian velvets and embroideries were produced using a wide variety of dye sources, suggesting influences from Europe as well as from Asia Minor. Dye sources imported from New World have been also detected. The range of biological sources is in very good correspondence with earlier results obtained from textiles in the Romanian Collections. LC-MS (single stage and tandem MS) approaches have been demonstrated to be valuable tools for dye identification in small-scaled samples from historical textile objects only if sufficient knowledge on the dyes and their biological sources is first accumulated within experiments performed on standard dyes and standard dyed fibers.     

Educational technology acceptance across national and professional cultures: a European study

The continuous development of new platforms and environments for technology-enhanced learning emphasizes the increasing importance of research in educational technology acceptance (ETA). Responding to this need, the unified theory of acceptance and use of technology (UTAUT) proposes a major ETA model. However, the UTAUT has been so far validated only in restrained contexts. The ongoing internationalization of education calls for extending ETA research and the UTAUT across national and professional boundaries. Therefore, this study aims at cross-cultural validation of the UTAUT by examining a large sample (N = 4,589) of educational technology users from three European countries, Germany, Romania and Turkey. As a first conclusion, the UTAUT questionnaire displays adequate validity, reliability, and measurement equivalence across cultures, which further enables UTAUT-based comparisons of the cultural groups. Secondly, the effect of technology use intention on the actual use behavior proves to be extremely weak. Several possible explanations are proposed along with suggestions for future research. Thirdly, for the first time in ETA research the cultural sample diversity allows the verification of correlations between acceptance and culture. Thus, this study makes headway in the integration of culture (sensu Hofstede) in the UTAUT by suggesting effects of power distance, individualism, masculinity, uncertainty avoidance and long-term orientation on performance and effort expectancy, perceived social influence, computer anxiety, technology use intention and actual use behavior. Fourthly, for educational practice the presented results suggest several ways of anticipating and supporting ETA in multicultural user groups.