排序方式： 共有24条查询结果，搜索用时 140 毫秒
1.
Achraf Ammar Hamdi Chtourou Khaled Trabelsi Johnny Padulo Mouna Turki Kais El Abed 《Journal of sports sciences》2015,33(4):358-368
The aim of this study was to investigate the performance of an Olympic-Weightlifting session training at three times of the day on the performance related to biochemical responses. Nine weightlifters (21 ± 0.5 years) performed, in randomised order, on three Olympic-Weightlifting training (snatch, clean and jerk) sessions (08:00 a.m., 02:00 p. m., 06:00 p. m.). Blood samples were collected: before, 3 min and 48 h after each training session. Haematological parameters and markers of muscle injury were assessed. Resting oral temperature and rating of perceived exertion (RPE) were also assessed during each session. ANOVA showed that the performance was better (P < 0.001) at 02:00 p. m. with a less RPE (P < 0.01) compared to the morning and the evening sessions while there was higher (P < 0.05) oral temperature at 06:00 p. m. versus 08:00 a.m. and 02:00 p. m. Muscle damage changed immediately (without significant effect after 48 h) after the training sessions with lower values ??in the evening compared to the morning. In conclusion, the afternoon training is more effective than morning or evening sessions for weightlifters. Therefore, coaches and weightlifters should be advised to schedule their training session in the afternoon hour. 相似文献
2.
The following books are reviewed. Value and validity in action research: a guidebook for reflective practitioners EILEEN M. SCHWALBACH (2003) London: Scarecrow Press 121 pp., ISBN 1 57886 017 2 (pb), £10.22 Supporting Teachers, Supporting Pupils D.F. WILSON, 2004 London: RoutledgeFalmer 184 pp., ISBN 0 415 33522 1 (hb), £65, 0 415 33523 X (pb), £22.50 相似文献
3.
This Participatory Action Research (PAR) project worked with four active street life oriented U. S. Born African men, to document
how a community sample of street life oriented U. S. Born African men between the ages of 16–65, frame and use “street life”
as a Site of Resiliency (Payne, Dissertation, 2005; Journal of Black Psychology 34(1):3–31, 2008). Qualitative data was collected in the form of 20 individual and two group interviews. These data reveal an inter-generational,
conceptualization and use, of the term “street love” in street life oriented U. S. born African men. Also, these data reveal
that notions of “street love” extend out a critique of community professionals (e.g., community researchers/interventionists,
social workers, etc.) as being unable and unwilling to produce “real help” in the local community. Examples of street love,
revealed in the study, include the men offering advice/counsel, money or “free turkeys” during Thanksgiving to one another
as well as other members of the local community. Results support Payne’s (2005) three-dimension conceptualization of “street love”: (1) individual, (2) group and (3) communal level expressions of “street
love”.
相似文献
| Yasser Arafat PayneEmail: |
4.
5.
This paper will offer some insights into possible ways to optimise the blended learning environment based on experience with this modality of teaching at Arab Open University/Jordan branch and also by reflecting upon the results of several meta-analytical studies, which have shown blended learning environments to be more effective than their face to face and online only counterparts. Three key elements will be presented as important ways for improving the blended learning environment: forging genuine collaborative partnerships between institutions in terms of the team-writing of Open and Distance Learning (ODL) material, adopting a more theoretically based instructional approach, such as the cognitive apprenticeship (CA) model, which emphasises making thinking visible and developing a comprehensive understanding of blended education in order to help students achieve their educational goals. 相似文献
6.
Hamdi Echeikh Ramzi Trabelsi Atif Iqbal Med Faouzi Mimouni 《Journal of The Franklin Institute》2018,355(5):2112-2141
High performance multiphase motor drive requires precise knowledge of the state quantities and the machine parameters. Access to these state quantities is through measurement using sensors whose accuracy is paramount to achieve the performance level required by industrial applications. However, the problems of the parameters variations, inaccessibility to the measurement of some states, no-observability of the machine in some regions, the cost of the sensors and their lack of precision, make this very difficult task. To address these problems, it is necessary to resort to soft sensors through the design of observers and estimators. In multiphase induction motor drive, the observation problem arises especially for rotor flux that is not accessible for measurement. About the parameters variations, the rotor resistance and the stator resistance are the most critical parameters of the machine because their influence is crucial for the control and observation. The change in the resistances can be as large as 40–50% of the rated value, which may affect the control adversely. This paper develops a new structure of an adaptive sliding mode observer based on an online estimation of the rotor resistance value in order to avoid the effect of its variation in the rotor flux oriented control. The results show convergent (the errors in the transient and steady states are 5% and 1%, respectively) behavior of the drive using the proposed control scheme for large rotor resistance variation under loaded condition. The stability of the drive is proved using Lyapunov criteria. The simulation results are validated using real time implementation. 相似文献
7.
This paper presents an example of how usability design strategies for children can be designed into educational material using CD-ROM based multimedia application for assisting parents and teachers to develop children＇s learning and knowledge in decreasing as well as motivate children aged 7-9 years old to reduce their anxious feelings towards dental treatment. In this paper, the authors provide usability design strategies for children in designing the information interfaces and presentation of a PMLE （persuasive multimedia learning environment）. PMLE is designed based on the six design categories of guidelines for children which have been applied to this study： general interaction, text, multimedia, navigation and search, graphical user interface and content. The results authors were able to on presenting this PMLE to 240 primary school children selected at random show how the decrease children＇s dental anxiety and motivate the children to get ready for dental visit. 相似文献
8.
The behavioural modifications that accompany Ramadan intermittent fasting (RIF) are usually associated with some alterations in the metabolic, physiological, and psychological responses of athletes that may affect sport performance. Muslim athletes who are required to train and/or compete during the month-long, diurnal fast must adopt coping strategies that allow them to maintain physical fitness and motivation if they are to perform at the highest level. This updated review aims to present the current state of knowledge of the effects of RIF on training and performance, focusing on key-factors that contribute to the effects of Ramadan on exercise performance: energy restriction, sleep deprivation, circadian rhythm perturbation, dehydration, and alterations in the training load. The available literature contain few studies that have examined the effects of RIF on physical performance in athletes and, to date, the results are inconclusive, so the effects of RIF on competition outcomes are not at present wholly understood. The diverse findings probably indicate individual differences in the adaptability and self-generated coping strategies of athletes during fasting and training. However, the results of the small number of well-controlled studies that have examined the effects of Ramadan on athletic performance suggest that few aspects of physical fitness are negatively affected, and where decrements are observed these are usually modest. Subjective feelings of fatigue and other mood indicators are often cited as implying additional stress on the athlete throughout Ramadan, but most studies show that these factors may not result in decreases in performance and that perceived exercise intensity is unlikely to increase to any significant degree. Current evidence from good, well-controlled research supports the conclusion that athletes who maintain their total energy and macronutrient intake, training load, body composition, and sleep length and quality are unlikely to suffer any substantial decrements in performance during Ramadan. Further research is required to determine the effect of RIF on the most challenging events or exercise protocols and on elite athletes competing in extreme environments. 相似文献
9.
Sonia Ben Jaafar 《Compare》2011,41(5):597-614
It has become a normative practice to include Performance-Based Accountability (PBA) policies in educational reforms to foster school changes that enhance student learning and success. There is considerable variation in PBA models that have an important impact on how they operate in schools. It is, therefore, important to characterize PBA models in different contexts. This article describes and categorizes the Qatari PBA model using a five-dimensional framework previously employed in Canada and the UK. The State of Qatar is a small rich developing country in the Arabian Gulf that introduced a wholesale educational reform in 2004. Although the characteristics of the Qatari PBA model are shared with those of Western systems, the Qatari PBA model does not fit into the previously described categories. Policy inconsistencies surfaced within the Qatar PBA model in terms of structure, consequential intent, and expectations of professional involvement. The tensions are rooted in a PBA model that assumes a high level of professional accountability interacting with the reality of system-wide capacity issues. The implementation of a coherent PBA model in policy and practice will require developing past this early phase of educational reform. 相似文献
10.
This paper tests the extent to which social media is shaping civic engagement initiatives to build trust among people and increase trust in their institutions, particularly the government, police and justice systems. A survey of 502 citizens showed that using social media for civic engagement has a significant positive impact on trust propensity and that this trust had led to an increase in trust towards institutions. Interestingly, while group incentives encouraged citizens to engage online for civic matters, it is civic publications through postings on social media that intensify the urge of citizens for civic action to address social issues. Post-hoc analysis via ten interviews with social activists was conducted to further examine their perceptions on trust towards institutions. The overall findings suggest that institutions, in their effort to promote a meaningful and trusting citizen engagement, need to enhance trust among the public by fostering social capital via online civic engagement and closing the public–police disengagement gap. 相似文献