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Aurora Torrents Francesc Bofill Genís Cardona 《Learning and individual differences》2011,21(5):607-612
Purpose
The aim of the present study was to determine, through colorimetric analysis, whether school textbooks for children aged 5 to 7 years contained tasks requiring normal colour vision discrimination for their resolution. In addition, the performance of a group of observers with diverse colour vision deficiencies was evaluated while conducting the tasks under analysis.Results
Textbooks of mathematics were found to include 10% of tasks which, to an observer with colour vision deficiency, would be very difficult or impossible to solve. The level of difficulty of each task was influenced by the type and degree of colour vision deficiency and by the actual ambient illumination under which it was observed.Conclusions
Some school textbooks need to be redesigned through an alternative use of colours and textures to take into consideration colour vision deficiencies. In view of the present findings, many Spanish editorial boards have committed to undertake these changes. 相似文献2.
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This article studies a television market where operators can sell access to programs and to advertising time. First, we determine the retail prices paid by viewers and advertisers to a monopoly platform when there are externalities between these two markets. We compare the prices that an unregulated platform would establish with the welfare maximizing prices. Second, we obtain the access charge that an independent programmer should pay to a television platform for using one of his channels. We show that the optimal access charge takes into account the direct cost of access and the platform's opportunity costs in the viewer and advertiser markets, which are affected by the externalities between the two markets. 相似文献
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Development and initial validation of a questionnaire to assess the reading beliefs of undergraduate students: the Cuestionario de Creencias sobre la Lectura 
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下载免费PDF全文 The aim of this research was to develop a new questionnaire for exploring the reading beliefs of undergraduate students, because the only currently available instrument has conceptual and methodological limitations. The paper describes the process of developing the instrument and presents a range of psychometric data obtained from a sample of 558 Spanish undergraduates who were in the first or final year of a degree programme in psychology, language and literature or engineering. The results provide evidence of the psychometric quality of items and reveal a dual structure of two and six factors, both obtained through exploratory and/or confirmatory factor analyses. Adequate reliability based on internal consistency of the factors was also demonstrated. As a measure of criterion validity, differences in reading beliefs by gender, academic year and knowledge area were also explored. The findings support the psychometric adequacy of this new instrument developed through an exploratory piece of research. Overall, the process of constructing the instrument and the results from this study provide a framework for research and intervention, in addition to presenting a tool that both researchers and teaching staff could use in the context of reading and reading comprehension. 相似文献
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Helicobacter pylori are ubiquitous Gram-negative bacteria with a high estimated level of infection in the world populations, but a majority of the infected persons are asymptomatic. This pathogen has been classified by the World Health Organization as a class I carcinogen and recognized as the causal agent of most peptic ulcers and chronic gastritis that might lead to stomach cancer. Although not all the transmission pathways of these bacteria into humans have been properly identified, enough data have sugg... 相似文献
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Before a higher education institution can develop international impact and reputation, it must first have developed its regional impact and reputation. Universities can contribute to the creation of wealth in given regions in a number of ways, not the least of which is technology transfer, the creation of firms and other spin‐off activities, and the furtherance of the their reputations for excellence. Staff and students spend a good deal of money in such regions, thus increasing regional wealth, and if given institutions pursue entrepreneurial policies in regard to the course programmes that they offer, their graduates will not only find nearby employment but will create employment for others. The “Innova” Project of the Polytechnic University of Catalonia is an illustration of how a major regional university is attempting to apply new teaching models to enhance entrepreneurial culture in the Barcelona area of Spain and thereby to increase regional human capital. 相似文献
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Francesc M. Esteve-Mon Ana Yara Postigo-Fuentes Linda Castañeda 《Higher Education Quarterly》2023,77(3):558-573
Implementation of digital tools and processes in Higher Education Institutions (HEIs) as an emergent activity depends on the sociomaterial relationships between institutional factors that dynamically interact with each other. This article systematically explores through a literature review some of the most relevant and up-to-date published studies to identify the ‘important factors’ to consider for the implementation of digital tools and processes in HEI. The goal of the paper is to turn these factors, conceived initially as previous conditions or characteristics of the institutions or people, into a list of strategic elements to be fostered by HEI leadership teams to promote better implementation of digital tools and processes in their institutions. In the final part of this work, we propose a framework that reflects these elements in a visual approach that highlights the activity-centred character of the framework as well as the emergent character of the implementation process itself. 相似文献
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Rodríguez-Illera José Luis Barberà Gregori Elena Molas-Castells Núria 《Education and Information Technologies》2021,26(4):4093-4109
The expansion of access to devices, as well as the production and publication options in social networks requires a broader definition of the traditional notion of personal digital storytelling. To get a deeper understanding of these practices in the group of adolescents, the objective of this article is to analyze what are the reasons that direct the publications of personal stories and what kind of filters, agents and consequences are articulated in these stories. To do this, the most qualitative part of an investigation on teenagers’ internet publication guidelines is synthesized. Specifically, the results of a semi-structured interview with 12 adolescents between 12 and 20 years are shown. The answers show that the interviewees’ perspective on what a digital story is goes beyond the format and varies depending on the network where it is published and the type of content. Thus, the emphasis and motivation of the publication has shifted from the digital - which has been incorporated with something normal and not differential - towards the personal, focusing the publications on the daily life of young people. An extension and refinement of the public-private dichotomy has been identified, maintaining general privacy guidelines above the dissemination of publications. As for filters, publications are preceded by the widespread use of image modification tools. Finally, the answers show the influence of personal agents, mostly friends and brothers, and technology agents, which determine the relationship between the type of story and the network where it is published.
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Germà Coenders Willem E. Saris Joan M. Batista‐Foguet Anna Andreenkova 《Structural equation modeling》2013,20(2):135-157
In this article 2 major problems of using the three‐wave quasi simplex model to obtain reliability estimates are illustrated. The 1st problem is that the sampling variance of the reliability estimates can be very large, especially if the stability through time is low. The 2nd problem is that, for the reliability parameter to be identified, the model assumes a particular change process, namely a Markov process. We show that minor violations of this assumption can lead to a large bias in the reliability estimates. The problems are evaluated using both real and Monte Carlo data. A model with repeated measurements in 1 of the waves is also discussed. 相似文献