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The aim of this study was to examine the effects of muscle-tendon length on joint moment and power during maximal sprint starts. Nine male sprinters performed maximal sprint starts from the blocks that were adjusted either to 40 degrees or 65 degrees to the horizontal. Ground reaction forces were recorded at 833 Hz using a force platform and kinematic data were recorded at 200 Hz with a film camera. Joint moments and powers were analysed using kinematic and kinetic data. Muscle - tendon lengths of the medial gastrocnemius, soleus, vastus medialis, rectus femoris and biceps femoris were calculated from the set position to the end of the first single leg contact. The results indicated that block velocity (the horizontal velocity of centre of mass at the end of the block phase) was greater (P < 0.01) in the 40 degrees than in the 65 degrees block angle condition (3.39 +/- 0.23 vs. 3.30 +/- 0.21 m . s(-1)). Similarly, the initial lengths of the gastrocnemius and soleus of the front leg in the block at the beginning of force production until half way through the block phase were longer (P < 0.001) in the 40 degrees than in the 65 degrees block angle condition. The initial length and the length in the middle of the block phase were also longer in the 40 degrees than in the 65 degrees block angle condition both for both the gastrocnemius (P < 0.01) and soleus (P < 0.01-0.05) of the rear leg. In contrast, the initial lengths of the rectus femoris and vastus medialis of the front leg were longer (P < 0.05) in the 65 degrees than in the 40 degrees block angle condition. All differences gradually disappeared during the later block phase. The peak ankle joint moment (P < 0.01) and power (P < 0.05) during the block phase were greater in the 40 degrees than in the 65 degrees block angle condition for the rear leg. The peak ankle joint moment during the block phase was greater (P < 0.05) in the 40 degrees block angle for the front leg, whereas the peak knee joint moment of the rear leg was greater (P < 0.01) in the 65 degrees block angle condition. The results suggest that the longer initial muscle-tendon lengths of the gastrocnemius and soleus in the block phase at the beginning of force production contribute to the greater peak ankle joint moment and power and consequently the greater block velocity during the sprint start. 相似文献
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To meet its future challenges in financing higher education, Egypt has no option but to search for alternative funding arrangements.
This article considers the question of how to do so, keeping in mind the need to ensure equitable access to good quality education
for those who cannot afford it. To this end, the article begins by assessing public expenditure on higher education in Egypt,
with respect to its adequacy, efficiency, and equity. Next, it analyzes the impacts that demographic changes, the demand for
quality education, and the transition to private provision of education will have on the nature of financing higher education
in the future. It concludes by suggesting alternative strategies to address the problem of financing higher education in Egypt. 相似文献
5.
Mustafa Sami Topcu 《欧洲师范教育杂志》2011,34(1):99-125
The purpose of the present study was to explore the relationships among Turkish elementary student teachers’ epistemological beliefs and moral reasoning, and to determine which types of epistemological beliefs elementary student teachers exhibit. The findings of the present study demonstrated that epistemological beliefs did not make a unique contribution to moral reasoning and student teachers’ epistemological beliefs developed as more or less independent beliefs. The factor analyses results suggest that multidimensional theory is more appropriate than unidimensional theory in explaining student teachers’ epistemological beliefs. 相似文献
6.
Early Childhood Education Journal - This study aimed to explore the digital environments of 3–6-year-old children within the home setting. A total of 537 children aged... 相似文献
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Conclusion Counseling in Arab schools in Israel is part and parcel of the whole Arab educationsystem. Like the system itself, counseling is also an object of many socio-politicalfactors which influence it negatively in such a status of affairs. However, unlikeother components of the system and due to its very nature, it is more susceptibleto these influences superimposed upon it. Its weakness is readily observable, morethan that of any other educational delivery service This weakness is due to itshigh level of susceptibility stemming from its nature as a reflector of both themacro and micro problems of education and society, to its being an object ofdifferent factors of cultural restraints since it is a super modern service plantedinto a traditional setting, to the lack of strong leadership and backing, and finally,at as due to the tact that at is at the cross-roads of conflicting political forces stemmingfrom the authonty's expectations on the one hand and from the community onthe other.Even though counseling and career guidance are found to be under varyingcultural and socio-political constraints in the Arab educational system in Israel,it is nonetheless a most meaningful educational service. Its meaningfulness isrecognized beyond its micro level of functioning (i e helping students in personalproblems, family issues and learning difficulties and/or guiding a student more orless successfully into a suitable career ). Its meaningfulness is notable also inthe following contributions.Firstly, it has a modernizing effect on the total educational system. It is aninnovation which Arab schools have had to cope with as they absorbed it. It createdpositive orientation towards innovations, especially those aiming at the well-beingof students. Secondly, counseling as a reflector of micro and macro problems hasuncovered those problems and brought them to the attention of students, teachers,authorities and communities. Thirdly, the introduction of counseling services intoArab schools opened a whole new path of vocational choice in that it familiarizedArab youth with a new area of vocations, namely the helping services in theirmodern sense. Finally, its introduction into the Arab educational system hassensitized students in particular, and the wider community an general, to look forprofessional help. Especially under conditions of cultural transition, this contributionis of special significance. Traditional ways of providing help to people haveeither vanished or become outdated and unsatisfactory. 相似文献
8.
Mahar Ali Nawaz Munir Muhammad Elawad Sami Gowen Simon Richard Hague Nigel Graham Meckenzi 《浙江大学学报(A卷英文版)》2004,5(10):1183-1190
Cells and cell-free solutions of the culture filtrate of the bacterial symbiont, Xenorhabdus nematophila taken from the entomopathogenic nematode Steinernema carpocapsae in aqueous broth suspensions were lethal to larvae of the diamondback moth Plutella xylostella. Their application on leaves of Chinese cabbage indicated that the cells can penetrate into the insects in the absence of
the nematode vector. Cell-free solutions containing metabolites were also proved as effective as bacterial cells suspension.
The application of aqueous suspensions of cells of X. nematophila or solutions containing its toxic metabolites to the leaves represents a possible new strategy for controlling insect pests
on foliage. 相似文献
9.
Sami OLUK Tansel SAKACI 《美中教育评论》2009,6(5):35-44
The main objectives of the study have been testing Roger conceptual learning method with regard to Turkish students and to investigate the applicability of the method on graduate students. The experimental group was formed by l0 volunteer students. The study lasted 16 weeks according to group discussion method. In this period, global environmental problems were handled under 8 headings. The research data was gathered from students' diaries or through semi-structured group interviews. The data was evaluated using the content analysis method. In the results of analysis, it was achieved that first three dimensions of Roger model were formed in most students and the last two dimensions were significant in some students. Therefore, it might be stated that Roger conceptual learning method handled in the study, not only with its conceptual but also emotional and pedagogic dimensions, functions similarly on Turkish graduate students as well. 相似文献
10.
The research questions addressed in this study were: what types of epistemological beliefs do elementary students have; what
types of metacognition do elementary students have; and what are the relationships among students’ perceived characteristics
of constructivist learning environment, metacognition, and epistemological beliefs. A total of 626 students enrolled in sixth,
seventh, and eight grades of nine elementary public schools located in Ankara, Turkey constituted the participants of this
study. Constructivist learning environment survey (CLES), Junior metacognitive awareness inventory (Jr. MAI), and Schommer
epistemological belief questionnaire (EB) were administered to students. Factor Analysis of Jr. MAI revealed both knowledge
of cognition and regulation of cognition items were loaded into one factor. Confirmatory factor analysis of EB revealed a
four factor structure namely innate ability, quick learning, omniscient authority, and certain knowledge. Regression analyses
revealed that metacognition and omniscient authority were significant predictors of personal relevance dimension of CLES.
Metacognition was found as the only predictor of the student negotiation. Innate ability and metacognition significantly contributed
to uncertainty. This study revealed that the elementary students with different mastery levels hold different epistemological
beliefs and multi-faceted nature of elementary school students’ metacognition was seemed to be supported with this study.
It was found that metacognition contributed to model more than epistemological beliefs for all three dimensions of CLES. 相似文献