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排序方式: 共有699条查询结果,搜索用时 15 毫秒
681.
Steve Clarke 《Educational Psychology in Practice》2006,22(3):185-197
The article describes how one Educational Psychology Service in the UK developed a service delivery based on self‐organised learning (SOL). This model is linked to the paradigms and discourses within which educational psychology and special educational needs work.
The work described here is dedicated to the memory of Brian Roberts, academic, close friend of Steve and a source of inspiration to both the authors. 相似文献
682.
An assessment of social sciences coverage by four prominent full-text online aggregated journal packages 总被引:1,自引:0,他引:1
The cost effectiveness and quality of full-text journals are analyzed for four prominent online aggregated journal packages: EBSCOhost Academic Search FullTEXT, UMI Proquest Direct Periodicals Research II, IAC’s Expanded Academic ASAP, and H.W. Wilson’s OmniFile. Price data from EBSCO’s Librarians’ Handbook are used to assess the total and average value of social sciences journals in each package. Quality of social sciences journals coverage is compared based on citation impact factors as recorded in Journal Citation Reports—Social Sciences Edition. 相似文献
683.
Kim Sterelny John Forge Ivan Crozier Sverre Myhra Randall Albury Steve Clarke Yvonne Luxford David Philip Miller Lynn K. Nyhart Mary Chan Richard McDonough Peter J. Riggs Allan Franklin Robert Nola David Bloor Mark Cortiula Thomas Nickles David Oldroyd Nicolas Rasmussen John Forge William A. S. Sarjeant 《Metascience》1998,7(2):331-418
684.
Javelin throwing is technically demanding. Sequences of upper and lower extremity motions are important for javelin throwing performance. The purpose of this study was to determine the general sequences of upper and lower extremity motions of elite male and female javelin throwers. Three-dimensional kinematic data were collected for 32 female and 30 male elite javelin throwers during competitions. Shoulder, elbow, wrist, hip, knee, ankle, lower trunk, and upper trunk joint and segment angles were reduced for the best trial of each participant. Beginning times of 6 upper extremity and 10 lower extremity joint and segment angular motions were identified. Sequences of the upper and lower extremity motions were determined through statistical analyses. Upper and lower extremity motions of the male and female elite javelin throwers followed specific sequences (P?≤?0.050). Upper extremity motions of the male and female elite javelin throwers did not follow a proximal-to-distal sequence as suggested in the literature. Male and female elite javelin throwers apparently employed different sequences for upper and lower extremity motions (P?0.001). Further studies are needed to determine the effects of sequences of upper and lower extremity motions on javelin throwing performance. 相似文献
685.
Research in Science Education - Science and science education are recognised internationally as essential for ensuring a sustainable and prosperous future. At the same time, significant equity... 相似文献
686.
687.
Modern tennis rackets are manufactured from composite materials with high stiffness-to-weight ratios. In this paper, a finite
element (FE) model was constructed to simulate an impact of a tennis ball on a freely suspended racket. The FE model was in
good agreement with experimental data collected in a laboratory. The model showed racket stiffness to have no influence on
the rebound characteristics of the ball, when simulating oblique spinning impacts at the geometric stringbed centre. The rebound
velocity and topspin of the ball increased with the resultant impact velocity. It is likely that the maximum speed at which
a player can swing a racket will increase as the moment of inertia (swingweight) decreases. Therefore, a player has the capacity
to hit the ball faster, and with more topspin, when using a racket with a low swingweight. 相似文献
688.
In this study, we assessed age-related changes in indoor 16.1-km cycling time-trial performance in 40 competitive male cyclists aged 25-63 years. Participants completed two tests: (1) a maximal ramped Kingcycle ergometer test, with maximal ramped minute power (RMPmax, W) recorded as the highest mean external power during any 60 s and maximal heart rate (HRmax, beats min(-1)) as the highest value during the test; and (2) an indoor Kingcycle 16.1-km time-trial with mean external power output (W), heart rate (beats min(-1)), and pedal cadence (rev min(-1)) recorded throughout the event. Results revealed age-related declines (P < 0.05) in absolute and relative time-trial external power output [(24 W (7.0%) per decade], heart rate [7 beats min(-1) (3.87%) per decade], and cadence [3 rev min(-1) (3.1%) per decade]. No relationships (P > 0.05) were observed for mean power output and heart rate recorded during the time-trial versus age when expressed relative to maximal ramped minute power and maximal heart rate respectively. Strong relationships (P < 0.05) were observed for maximal ramped minute power and time-trial power (r= 0.95) and for maximal heart rate and time-trial heart rate (r= 0.95). Our results show that indoor 16.1-km time-trial performance declines with age but relative exercise intensity (%RMPmax and %HRmax) does not change. 相似文献
689.
Leigh S Gross MT Li L Yu B 《Sports biomechanics / International Society of Biomechanics in Sports》2008,7(2):173-193
The aim of this study was to determine the relationship between discus throwing performance and the following technical parameters: hip-shoulder and shoulder-arm separation, trunk forward-backward tilt, throwing-arm elevation angles, and the absolute and relative throwing procedure phase times. Videographic data of 51 male and 53 female discus throwers' competitive performances were captured during major meets. The three-dimensional coordinates of 21 body landmarks and the discus were obtained for each thrower's best trial using direct linear transformation. The technical parameters were reduced from the three-dimensional data at six critical instants during the throwing procedure. Hierarchical stepwise multiple regression analyses were performed to determine the relative influence of linear combinations of the technical parameters on discus throwing performance. Specific techniques associated with linear combinations of certain technical parameters were identified using canonical correlations. Males and females were analysed separately. Suggestions for controlling the height of release and the vertical component of the speed of release using an effective technique are made. 相似文献
690.
Blair T. Crewther Andrew G. Thomas Steve Stewart-Williams Liam P. Kilduff Christian J. Cook 《European Journal of Sport Science》2017,17(2):188-194
This study examined the moderating effect of cortisol (C) on the relationship between testosterone (T) and hand-grip strength (HGS) in healthy young men. Sixty-five males were monitored for salivary T, C and HGS before and 15?min after a short bout (5?×?6-s trials) of sprint cycling exercise. Sprint exercise promoted (p?<?.05) positive changes in T (6.1?±?24.9%) and HGS (3.4?±?7.5%), but a negative C response (?14.4?±?33.1%). The T and C measures did not independently predict HGS, but a significant T?×?C interaction was found in relation to these outcomes. Further testing revealed that pre-test T and HGS were negatively associated (p?<?.05), but only in men with high C levels. The exercise changes in T and HGS were also negatively related in men with low C levels (p?<?.05), but no relationship was seen in men with high C levels. In summary, complex relationships between T and HGS emerged when considering C as a moderating variable. The pre-test combination of high C and low T levels favoured absolute HGS, whereas low pre-test C levels and a smaller T change were linked to larger HGS changes. These associations suggest that, in the current format, T is not necessarily anabolic to muscle strength in healthy young men. Such complexities could also explain some of the inconsistent T relationships with physical performance in lesser trained male populations. 相似文献