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Dr. David Giltrow Paulina Pannen 《Educational technology research and development : ETR & D》1992,40(1):111-114
Summary In industralized nations, information anxiety and information overload are topics of discussion. Books have been written about how to evaluate literature reviews where hundreds of items are being assessed.In many developing nations, information starvation is more the norm. The authors have begun exploring how information viruses can cause invalid content to work into an instructional design and permeate deeply into an educational system, ultimately producing good learning of subject matter that is out of date, contains serious omissions, or is inaccurate or misleading.There are ways to forestall information viruses from entering instructional materials. Much could be achieved by using new information search technologies and telecommunications links, fostering better appreciation of basic information technology, and upgrading the role of librarian in the instructional design process. Changes are needed in attitudes of government ministries and foreign aid funding agencies in order to support efforts to prevent information viruses from occurring.Dr. David Giltrow is an independent consultant specializing in the application of educational technology in developing countries. 相似文献
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Marianela Navarro Carla Förster Caterina González Paulina González-Pose 《International Journal of Science Education》2016,38(9):1459-1482
Understanding attitudes toward science and measuring them remain two major challenges for science teaching. This article reviews the concept of attitudes toward science and their measurement. It subsequently analyzes the psychometric properties of the Test of Science-Related Attitudes (TOSRA), such as its construct validity, its discriminant and concurrent validity, and its reliability. The evidence presented suggests that TOSRA, in its Spanish-adapted version, has adequate construct validity regarding its theoretical referents, as well as good indexes of reliability. In addition, it determines the attitudes toward science of secondary school students in Santiago de Chile (n?=?664) and analyzes the sex variable as a differentiating factor in such attitudes. The analysis by sex revealed low-relevance gender difference. The results are contrasted with those obtained in English-speaking countries. This TOSRA sample showed good psychometric parameters for measuring and evaluating attitudes toward science, which can be used in classrooms of Spanish-speaking countries or with immigrant populations with limited English proficiency. 相似文献
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Andr&#; Chiara Lindstr&#;m Paulina Arzarello Ferdinando Holmqvist Kenneth Robutti Ornella Sabena Cristina 《International Journal of Science and Mathematics Education》2013,13(2):237-259
We use eye tracking as a method to examine how different mathematical representations of the same mathematical object are attended to by students. The results of this study show that there is a meaningful difference in the eye movements between formulas and graphs. This difference can be understood in terms of the cultural and social shaping of human perception, as well as in terms of differences between the symbolic and graphical registers.
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How well does the UK corporate governance and financial system (CG&FS) support and encourage innovation? Each CG&FS faces four challenges which vary by sector: novelty, reconfiguration, visibility and spill-overs. High novelty in technologies and markets requires high industry-wide expertise; need for radical reconfiguration requires strong pressure for shareholder value. Low visibility of innovation processes requires shareholder engagement; high spill-overs to and from stakeholders require substantial stakeholder inclusion. The UK CG&FS is rated in these terms against the US and ‘insider’ economies, drawing on recent fieldwork, and the ratings are shown to account well for the relative R&D intensity and specialisation of UK-owned firms. 相似文献
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Katya Vargas-Ortiz Victoriano Pérez-Vázquez Arturo Figueroa Francisco J. Díaz Paulina G. Montaño-Ascencio 《European Journal of Sport Science》2018,18(2):226-234
In recent years, prevalence of obesity in children and adolescents has increased. A strategy for prevention and management of obesity is aerobic training (AT) due to its effectiveness to decrease fat mass. AT increases the content of SIRT3, a mitochondrial protein that increases the expression of PGC-1α and NFR1, thereby enhances mitochondrial function and metabolic health. Resistance training (RT) provides metabolic benefits but its effect on SIRT3 content is unknown. To compare the effect of AT and RT on SIRT3, PGC-1α and NRF-1 protein levels in skeletal muscle of sedentary obese adolescents. Twenty-seven sedentary obese male adolescents (age: 16.7?±?0.9 years; BMI: 33.7?±?4.3?kg/m2) completed a 1-month control period prior to randomization to one of two supervised exercise protocols: AT (3 days/week, 40 min/day, 70–80% peak heart rate) or RT (3 days/week, 11 exercises, 2 sets/exercise, 12 repetitions/set) for 12 weeks. Biopsies were obtained from the vastus lateralis muscle before and after 12 weeks to analyse SIRT3, PGC-1α and NRF-1 proteins content. Peak oxygen consumption (VO2peak) and anthropometric variables were evaluated before and after training. AT increased SIRT3 content, which was associated with improvements in PGC-1α content and body fat percentage. RT did not affect SIRT3 or PGC-1α. VO2peak increased only in AT. The increase in muscle mitochondrial SIRT3 was observed only following AT. In contrast, RT increased muscle mass without improving SIRT3 in obese male adolescents. 相似文献