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11.
Nina Österle Yannis Livieratos Emmanuil Kabourakis 《The Journal of Agricultural Education and Extension》2016,22(4):345-362
Purpose: The aim of this paper is to compare the extension services offered in the field of organic agriculture (OA) in Baden-Württemberg (BW), Germany and Crete, Greece.
Design/methodology approach: 16 in-depth interviews, 10 in BW and 6 in Crete, were carried out with representatives of OA extension providers; interviews were qualitatively analyzed and overall results compared between the two areas.
Findings: The structure along with extensionists' capacities and methods employed are rich, appropriate, and well functioning in BW. On the contrary, poor structure, lack of networking and facilitation in Crete jeopardizes extension performance and impact. Practical implications: Contrary to BW, the situation in Grete does not allow for much optimism concerning the successful development of OA and the implementation of European Innovation Partnerships.
Theoretical implications: Further elaboration of the characteristics of extension/advisory services and their interlinkages, including the role of the state in facilitating pluralistic services, is needed.
Originality/value: The paper demonstrates the importance of the structure of extension services and the central facilitation role of the state; furthermore, the interdependency of structure, capacity and the methods employed is demonstrated which, in turn, influences extension performance and impact especially networking and facilitation for social learning and innovation co-creation. 相似文献
12.
Yannis Hadzigeorgiou Stephen Klassen Cathrine Froese Klassen 《Science & Education》2012,21(8):1111-1138
The purpose of this paper is to discuss and apply the notion of romantic understanding by outlining its features and its potential role in science education, to identify its features in the story of Nikola Tesla, and to describe an empirical study conducted to determine the effect of telling such a story to Grade 9 students. Elaborated features of the story are the humanization of meaning, an association with heroes and heroic qualities, the limits of reality and extremes of experience, a sense of wonder, and a contesting of conventions and conventional ideas. The study demonstrates the learning benefits of encouraging a romantic understanding through a story that is structured explicitly around the identified features, in this instance in the context of the production and transmission of alternating current electricity. Quantitative and qualitative analyses of journal entries showed that the group of students who were encouraged to understand the concept of alternating current romantically (the experimental group) became more involved with both the content and the context of the story than a comparison group of students who were taught the concept explicitly, without a context (the control group). The students in the experimental group also performed statistically better on a science-content test taken 1?week and again 8?weeks after the indicated teaching intervention. This finding, along with the content analyses of students?? journals, provided evidence of romantic understanding of the science content for those students who listened to the Tesla story. 相似文献
13.
In many probabilistic modeling approaches to Information Retrieval we are interested in estimating how well a document model
“fits” the user’s information need (query model). On the other hand in statistics, goodness of fit tests are well established
techniques for assessing the assumptions about the underlying distribution of a data set. Supposing that the query terms are
randomly distributed in the various documents of the collection, we actually want to know whether the occurrences of the query
terms are more frequently distributed by chance in a particular document. This can be quantified by the so-called goodness
of fit tests. In this paper, we present a new document ranking technique based on Chi-square goodness of fit tests. Given
the null hypothesis that there is no association between the query terms q and the document d irrespective of any chance occurrences, we perform a Chi-square goodness of fit test for assessing this hypothesis and calculate
the corresponding Chi-square values. Our retrieval formula is based on ranking the documents in the collection according to
these calculated Chi-square values. The method was evaluated over the entire test collection of TREC data, on disks 4 and
5, using the topics of TREC-7 and TREC-8 (50 topics each) conferences. It performs well, outperforming steadily the classical
OKAPI term frequency weighting formula but below that of KL-Divergence from language modeling approach. Despite this, we believe
that the technique is an important non-parametric way of thinking of retrieval, offering the possibility to try simple alternative
retrieval formulas within goodness-of-fit statistical tests’ framework, modeling the data in various ways estimating or assigning any arbitrary theoretical distribution
in terms. 相似文献
14.
Martin Mooses Kerli Mooses Diresibachew Wondimu Haile Jérôme Durussel Priit Kaasik Yannis Paul Pitsiladis 《Journal of sports sciences》2015,33(2):136-144
The purpose of this study was to investigate the relationship between running economy (RE) and performance in a homogenous group of competitive Kenyan distance runners. Maximal aerobic capacity (VO2max) (68.8 ± 3.8 ml?kg?1?min?1) was determined on a motorised treadmill in 32 Kenyan (25.3 ± 5.0 years; IAAF performance score: 993 ± 77 p) distance runners. Leg anthropometry was assessed and moment arm of the Achilles tendon determined. While Achilles moment arm was associated with better RE (r2 = 0.30, P = 0.003) and upper leg length, total leg length and total leg length to body height ratio were correlated with running performance (r = 0.42, P = 0.025; r = 0.40, P = 0.030 and r = 0.38, P = 0.043, respectively), RE and maximal time on treadmill (tmax) were not associated with running performance (r = ?0.01, P = 0.965; r = 0.27; P = 0.189, respectively) in competitive Kenyan distance runners. The dissociation between RE and running performance in this homogenous group of runners would suggest that RE can be compensated by other factors to maintain high performance levels and is in line with the idea that RE is only one of many factors explaining elite running performance. 相似文献
15.
Marieke De Craemer Ellen De Decker Ilse De Bourdeaudhuij Maïté Verloigne Yannis Manios Greet Cardon 《Journal of sports sciences》2015,33(10):1051-1057
This study aimed at translating the physical activity (PA) guideline (180 min of total PA per day) into a step count target in preschoolers. 535 Flemish preschoolers (mean age: 4.41 ± 0.58) wore an ActiGraph accelerometer (GT1M, GT3X and GT3X+) – with activated step count function – for four consecutive days. The step count target was calculated from the accelerometer output using a regression equation, applying four different cut-points for light-to-vigorous PA: Pate, Evenson, Reilly, and Van Cauwenberghe. The present analysis showed that 180 min of total PA per day is equivalent to the following step count targets: 5,274 steps/day using the Pate cut-point, 4,653 steps/day using the Evenson cut-point, 11,379 steps/day using the Reilly cut-point and 13,326 steps/day using the Van Cauwenberghe cut-point. Future studies should focus on achieving consensus on which cut-points to use in preschoolers before a definite step count target in preschoolers can be proposed. Until then, we propose to use a provisional step count target of 11,500 steps/day as this step count target is attainable, realistic and helpful in promoting preschoolers’ PA. 相似文献
16.
Papaioannou A Bebetsos E Theodorakis Y Christodoulidis T Kouli O 《Journal of sports sciences》2006,24(4):367-382
Little information exists about the causal relationships of sport and exercise participation with goal orientations, perceived athletic competence and intrinsic motivation in physical education. A longitudinal study was conducted involving 882 Greek students who completed questionnaires on three occasions: 3 - 5 weeks into the academic year, 3 - 6 weeks before the end of the academic year, and 7 months later. The data were analysed using structural equation models, controlling for age. Task orientation and intrinsic motivation in physical education at the beginning of the academic year predicted sport and exercise participation 7 and 14 months later. Perceived athletic competence both at the beginning and end of the academic year predicted sport and exercise participation 7 and 14 months later, while ego orientation did not predict sport and exercise involvement at either time. Previous sport and exercise participation had positive effects on task orientation and perceived athletic competence 3 - 6 weeks before the end of the academic year and predicted all cognitive-affective constructs 7 months later. These results imply that the cultivation of task orientation, intrinsic motivation in physical education and perceived athletic competence will help to promote sport and exercise participation in adolescence. 相似文献
17.
18.
The purpose of the present study was to investigate the influence of two physical education teaching methods, the creative movement teaching method and the traditional teaching method, on self-esteem components. Specifically, the target of the study was to examine if the teaching of creative movement in physical education classes could influence a child's self-esteem. One hundred and seven (N=107) fifth and sixth grade children (aged 11-12 years) were used from an elementary school in Athens, Greece. Teaching methods were systematically applied for three months (24 teaching hours). The Self-Perception Profile for Children was used to measure children's self-esteem on two occasions, before and after the experimental conditions. A 2 2 2 (groups 2 pre-post measure) analysis showed a significant relationship between the five subscales (scholastic competence, social acceptance, athletic competence, physical appearance, and behavioral conduct) and an overall sense of self-worth (global self-worth). Both teaching methods should influence children's self-esteem from pre- to post-test. However, the teaching method of creative movement was most effective in improving the pupils' general self-esteem and also specific areas of self-esteem such as the cognitive, the social and the physical. 相似文献
19.
This study was conducted to provide further information regarding factors associated with educational evaluation, using a qualitative approach. Fifty-five interviews were carried out with school principals. The results of the present study supported the notion that the qualitative methods could provide information that quantitative procedures could not. Additionally, the findings also provided useful information for solving problems in OEP implementation and enhanced decision-making by indicating points of the program that should be improved. 相似文献
20.
基于数字移相全息的图像重构 总被引：3，自引：0，他引：3
1IntroductionDifferent methods of holographic interferometry re-lated techniques have been used effectively for defectvisualisation in artwork diagnosis[1].Physical recon-struction of recorded wave fields though is of li mitedapplicability for on-field or… 相似文献