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A number of recent studies have measured the extent and timing of segment rotation during the golf swing. A promising technique,
instantaneous screw axis (ISA) theory, could provide a better expression of segment rotation. In Part 1 of this two-part study,
the objectives are to identify the ISA of the pelvis, shoulders and left arm during the downswing, compute segment angular
velocity relative to that segment’s ISA and verify that ISA theory is a valid tool to analyse segment rotation during the
golf swing. Results indicate that for all subjects, at least 71% of marker velocity is a result of rotation about their respective
ISA, when averaging results over the duration of the downswing, confirming that motion is primarily rotational. Furthermore,
ISA position and orientation of each segment approaches, on average, the expected gross axis of rotation, confirming that
motion about the ISA is representative of joint motion. 相似文献
23.
The development of talent is a complex process mediated by a host of psychological, social, physical, and environmental variables. Unfortunately, the multiple processes involved in talent development are frequently ignored by the systems and protocols employed in sport. Modern approaches to talent development are beginning to stress the initial possession, then subsequent development, of generic psychological characteristics (e.g. psychological characteristics of developing excellence; MacNamara, Button, & Collins, 2010a , 2010b ) as the best way to realize latent potential. Accordingly, this paper describes the development and initial validation of the Psychological Characteristics of Developing Excellence Questionnaire (PCDEQ). In the first phase, an initial list of 160 items was developed. A combination of expert panel reviews, cognitive interviews, and a pilot test was used to assess the relevance, representativeness, and validity of each item. Ninety-six items were retained following these steps. Exploratory factor analysis, with a sample of 363 athletes, revealed an interpretable 59-item, 6-factor solution with good internal consistency (0.870, 0.866, 0.847, 0.741, 0.749, and 0.701 respectively). The Psychological Characteristics of Developing Excellence Questionnaire would appear to hold promise as a useful tool to provide coaches and athletes with information about the psychological characteristics of developing excellence that are being properly addressed or neglected during different stages of development or in different contexts. 相似文献
24.
Christine Nash Russell Martindale Dave Collins Amanda Martindale 《Journal of sports sciences》2013,31(10):985-994
Abstract Research into expertise is increasing across a number of domains pertinent to sport. Whilst this increase is particularly apparent in coaching, a key question is how to identify an expert coach? Accordingly, this paper draws upon existing studies into expert coaches to address this issue; in particular, the criteria used to select expert coaches for research purposes and the methods used in expert coach research. Based on these data, we contend that the elements of expertise are not fully reflected within currently accepted criteria which, in turn, results in expert coaching research not necessarily identifying the appropriate individuals to study. The paper concludes with recommendations for more rigorous criteria for selecting expert coaches and highlights the associated implications for the future training and development of expert coaches. 相似文献
25.
Jason Moran Gavin R. H. Sandercock Rodrigo Ramírez-Campillo César Meylan Jay Collison Dave A. Parry 《Journal of sports sciences》2017,35(11):1041-1051
This meta-analysis investigated the maturation-related pattern of adaptations to resistance training in boy athletes. We included studies examining the effects of 4–16-week resistance training programmes in healthy boy athletes aged 10–18 years. Pooled estimates of effect size for change in strength across all studies (n = 19) were calculated using the inverse–variance random effects model for meta-analyses. Estimates were also calculated for groups based on likely biological maturity status (“before”, “during” and “after” peak height velocity). Using the standardised mean difference, resistance training increased strength across all groups (effect size = 0.98, [CI: 0.70–1.27]). Strength gains were larger during (1.11 [0.67–1.54]) and after (1.01 [0.56–1.46]) peak height velocity than before (0.5 [?0.06–1.07]). Adaptations to resistance training are greater in adolescent boys during or after peak height velocity. These findings should help coaches to optimise the timing of training programmes that are designed to improve strength in boy athletes. 相似文献
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Dave Basarab 《Performance Improvement》2011,50(3):22-27
The Predictive Evaluation (PE) model is a training and evaluation approach with the element of prediction. PE allows trainers and business leaders to predict the results, value, intention, adoption, and impact of training, allowing them to make smarter, more strategic training and evaluation investments. PE is invaluable for companies that struggle to define the success of training, fight to justify its value, or view training as an expense rather than an investment with predicted return. 相似文献
29.
Mel Ainscow Peter Farrell Dave Tweddle 《International Journal of Inclusive Education》2013,17(3):211-229
In many parts of the world there is evidence of initiatives aimed at finding ways of creating forms of mainstream schooling that can respond to pupils with disabilities and others seen as having special educational needs (UNESCO 1995). There is also a growing research literature that throws light on how schools and classrooms can be developed in relation to this idea (e.g. Rouse and Florian 1996, Sebba and Sachdev 1997, Thomas et al. 1998, Ainscow 1999, Clark et al. 1999). However, few studies have considered the contributions and roles of local administrative arrangements to such developments, even though there is evidence that these can be highly influential in relation to policy implementation in general (Spillane 1998). Drawing on the evidence of a recent study carried out in England, this paper starts to fill this gap. Specifically, it addresses the question: in what ways do local administrative arrangements bear on attempts to develop more inclusive ways of working in schools? In considering the evidence and arguments presented it is important to recognize that the peculiarities of each national context mean that district level arrangements for the management of education in one country cannot be assumed to be similar to that in other countries. Consequently, transporting conclusions from one situation to another is impossible. Nevertheless, a detailed engagement with the experiences of particular countries can provide a useful basis for reflection on what happens elsewhere. Before considering this specific agenda, however, we summarize certain relevant international trends. 相似文献
30.
Dave Pratt 《Technology, Pedagogy and Education》2013,22(1):53-61
ABSTRACT This paper examines the debate in recent years about the most effective strategy for establishing the use of information technology in teacher training establishments in the United Kingdom. Evidence is presented to support the notion that efforts should continue to permeate the use of information technology throughout the courses of such establishments. However, the paper suggests that staff development and the degree of permeation of information technology within the culture develop alongside each other. As one of these variables change, it feeds the development of the other; neither is an independent variable though both are influenced by external factors. Recognising this as a relatively slow process, the paper proposes a model of evolutionary permeation. 相似文献