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Anastassios Pouris 《Higher Education》2007,54(4):501-509
This article reports the results of an investigation to identify the disciplinary strengths and the international standing
of the higher education institutions in South Africa. Even though comparative assessments provide valuable information for
research administrations, researchers and students such information is not available in South Africa currently. The Essential
Science Indicators database of the Institute for Scientific Information is utilized for the investigation and six South African
universities are identified to be included in the top 1% of the world’s institutions cited in the international scientific
literature. The identified institutions are University of Cape Town, University of Pretoria, Orange Free State University,
University of Witwatersrand, University of Natal and University of Stellenbosch. Analysis of the scientific disciplines in
which the South African institutions meet the threshold requirements for inclusion in the database shows that the country
has citation footprints in only nine of the 22 broad scientific disciplines. The article identifies the international standing
of the South African universities in the various scientific disciplines, and elaborates on the consequences relevant to higher
education and science and technology policy. 相似文献
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In this study, we examined the long-term reductions in maximal isometric force (MIF) caused by a protocol of repeated maximal isometric contractions at long muscle length. Furthermore, we wished to ascertain whether the reductions in MIF are dependent on muscle length--that is, are the reductions in MIF more pronounced when the muscle contracts at a short length. The MIF of the elbow flexors of seven young male volunteers was measured at five different elbow angles between 50 degrees and 160 degrees. On a separate day, the participants performed 50 maximal voluntary isometric muscle contractions with the elbow flexors at a lengthened position; that is, with the shoulder hyperextended at 45 degrees and the elbow joint fixed at 140 degrees. Following this exercise, the MIF at the five elbow angles, range of motion, muscle soreness and plasma creatine kinase activity were measured at 24 h intervals for 4 days. On day 1, the decline in MIF was higher at the more acute elbow angles of 50 degrees (42 +/- 8%) and 70 degrees (39 +/- 8%; both P<0.01) than at 90 degrees (26 +/- 4%) and 140 degrees (16 +/- 3%; both P<0.01). No significant reduction in MIF was evident at an elbow angle of 160 degrees. Maximal isometric force at an elbow angle of 140 degrees was fully restored on day 3, whereas at an angle of 50 degrees it remained depressed for the 4 day observation period. Restoration of MIF was a function of the elbow angle, with force recovery being less at the smaller angles. The range of motion was decreased by 14 +/- 2 degrees on day 1 (P<0.01) and did not return to baseline values by day 4. Muscle soreness ratings remained significantly elevated for the 4 day period. Serum creatine kinase peaked on day 1 (522 +/- 129 IU, P<0.01) and decreased thereafter. We conclude that the disproportionate decrease in MIF at the small elbow angles and the length-specific recovery in MIF after repeated maximal isometric contractions at long muscle length may be explained by the presence of overstretched sarcomeres that increased in series compliance of the muscle, therefore causing a rightward shift of the force-length relationship. 相似文献
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Anastassios Pouris 《Minerva》2007,45(1):3-16
The accurate measurement of the time spent by academics on research and development activities is of great importance to universities
and government. This essay outlines the ways in which different countries estimate these factors, and suggests ways of producing
more reliable estimates. 相似文献
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Tassos A. Mikropoulos Anthimos Chalkidis Apostolos Katsikis Anastassios Emvalotis 《Education and Information Technologies》1998,3(2):137-148
This case study reports on an investigation of the attitude of education students towards virtual reality (VR) as a tool in the educational process, and towards virtual learning environments on specific disciplines. Our results indicate a favourable attitude towards VR in the educational process. Although immersion was not supported in this study, half of the students declared immersion experiences. Students consider the mouse the most effective input device for navigation in virtual environments, with a joystick the second one. Because the sampling population is small, the qualitative results must be regarded as tentative. There is, however, a need for further investigation, which is currently being undertaken by our group. 相似文献
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Anastasios Karakolidis Anastassios Emvalotis 《International Journal of Science Education》2019,41(11):1457-1474
The importance of motivation-related factors in shaping students’ academic achievement across a range of areas, including science, has been consistently acknowledged by the existing research literature. In an effort to improve students’ science achievement, many education systems put particular emphasis on the enhancement of intrinsic (i.e. enjoyment and interest) and instrumental motivation in the subject. However, based on the latest Programme for International Student Assessment (PISA) data, many of the countries that managed to increase their motivation indices between 2006 and 2015 did not necessarily note a rise in science performance, with many still performing below the Organisation for Economic Co-operation and Development (OECD) average. Interestingly, although students’ motivation increased in some of these countries (e.g. Luxembourg, Iceland and Greece), their average performance in science decreased. Using the PISA 2015 data for Greece, this study examined the case of high motivation and low achievement in science by incorporating epistemic beliefs in the discussion. The multilevel analysis confirmed the importance of 15-year-old students’ motivation for learning science in predicting their science achievement and highlighted the positive predictive power of their epistemic beliefs. Policy and practice recommendations are provided based on the study findings, stressing the key role of students’ epistemic beliefs. 相似文献
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Despite its significance, the teacher-student relationship in higher education remains an under-researched field. The current study used constructivist grounded theory, in order to enrich the relevant discussion. More specifically, it aimed at exploring how the teacher-student relationship in graduate education develops (and gradually evolves) based on the perceptions and experiences of the parties involved. Data was collected through intensive interviewing with twenty teacher educators and by five focus groups with twenty-five graduate students in Educational Sciences. Based on the combined constant comparative analysis of the teachers’ and students’ perceptions and experiences, the teacher-student relationship in higher education surfaced as a complex dynamic process. Despite the teachers’ hierarchical superiority, it is characterised by reciprocating in all its manifestations: mutually wanting to relate, developing characteristics of a meaningful relationship, overcoming obstacles, maintaining boundaries and experiencing the positive outcomes. 相似文献
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Abstract In this study, we examined the long-term reductions in maximal isometric force (MIF) caused by a protocol of repeated maximal isometric contractions at long muscle length. Furthermore, we wished to ascertain whether the reductions in MIF are dependent on muscle length — that is, are the reductions in MIF more pronounced when the muscle contracts at a short length. The MIF of the elbow flexors of seven young male volunteers was measured at five different elbow angles between 50° and 160°. On a separate day, the participants performed 50 maximal voluntary isometric muscle contractions with the elbow flexors at a lengthened positions that is, with the shoulder hyperextended at 45° and the elbow joint fixed at 140°. Following this exercise, the MIF at the five elbow angles, range of motion, muscle soreness and plasma creatine kinase activity were measured at 24 h intervals for 4 days. On day 1, the decline in MIF was higher at the more acute elbow angles of 50° (42±8%) and 70° (39±8%; both P<0.01) than at 90° (26±4%) and 140° (16±3%; both P<0.01). No significant reduction in MIF was evident at an elbow angle of 160°. Maximal isometric force at an elbow angle of 140° was fully restored on day 3, whereas at an angle of 50° it remained depressed for the 4 day observation period. Restoration of MIF was a function of the elbow angle, with force recovery being less at the smaller angles. The range of motion was decreased by 14±2° on day 1 (P<0.01) and did not return to baseline values by day 4. Muscle soreness ratings remained significantly elevated for the 4 day period. Serum creatine kinase peaked on day 1 (522±129 IU, P<0.01) and decreased thereafter. We conclude that the disproportionate decrease in MIF at the small elbow angles and the length-specific recovery in MIF after repeated maximal isometric contractions at long muscle length may be explained by the presence of overstretched sarcomeres that increased in series compliance of the muscle, therefore causing a rightward shift of the force-length relationship. 相似文献
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