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101.
The aim of this study was to assess the influence of three imposed crank rates on the attainment of peak oxygen consumption ( V O 2peak ) and other physiological responses during incremental arm crank ergometry. Twenty physically active, although non-specifically trained, males volunteered for the study. They completed an exercise protocol using an electrically braked arm ergometer (Lode Angio, Groningen, Netherlands) at crank rates of 60, 70 and 80 rev·min -1 . The order of tests was randomized and they were separated by at least 2 days. Peak V O 2 was significantly higher ( P ? 0.05) at 70 and 80 rev·min -1 than at 60 rev·min -1 . Peak ventilation volume increased as a function of crank rate and was higher ( P ? 0.05) at 80 than at 60 rev·min -1 . Peak heart rate was higher ( P ? 0.05) at 70 and 80 rev·min -1 than at 60 rev·min -1 . Furthermore, 70 and 80 rev·min -1 resulted in an extended test time compared with 60 rev·min -1 . The greater physiological responses observed during the tests at the two faster crank rates might have been the result of a postponement of acute localized neuromuscular fatigue, allowing for more work to be completed. We recommend, therefore, that an imposed crank rate between 70 and 80 rev·min -1 should be used to elicit V O 2peak and other physiological responses in arm crank ergometry. 相似文献
102.
Mark Wilson Nickolas C. Smith Mark Chattington Mike Ford Dilwyn E. Marple-Horvat 《Journal of sports sciences》2013,31(11):1223-1233
Abstract We tested some of the key predictions of processing efficiency theory using a simulated rally driving task. Two groups of participants were classified as either dispositionally high or low anxious based on trait anxiety scores and trained on a simulated driving task. Participants then raced individually on two similar courses under counterbalanced experimental conditions designed to manipulate the level of anxiety experienced. The effort exerted on the driving tasks was assessed though self-report (RSME), psychophysiological measures (pupil dilation) and visual gaze data. Efficiency was measured in terms of efficiency of visual processing (search rate) and driving control (variability of wheel and accelerator pedal) indices. Driving performance was measured as the time taken to complete the course. As predicted, increased anxiety had a negative effect on processing efficiency as indexed by the self-report, pupillary response and variability of gaze data. Predicted differences due to dispositional levels of anxiety were also found in the driving control and effort data. Although both groups of drivers performed worse under the threatening condition, the performance of the high trait anxious individuals was affected to a greater extent by the anxiety manipulation than the performance of the low trait anxious drivers. The findings suggest that processing efficiency theory holds promise as a theoretical framework for examining the relationship between anxiety and performance in sport. 相似文献
103.
Mike Cronin 《国际体育史杂志》2013,30(18):2753-2760
104.
Abstract In this study, we examined the effects of different work:rest durations during 20 min intermittent treadmill running and subsequent performance. Nine males (mean age 25.8 years, s = 6.8; body mass 73.9 kg, s = 8.8; stature 1.75 m, s = 0.05; [Vdot]O2max 55.5 ml · kg?1 · min?1, s = 5.8) undertook repeated sprints at 120% of the speed at which [Vdot]O2max was attained interspersed with passive recovery. The work:rest ratio was constant (1:1.5) with trials involving either short (6:9 s) or long (24:36 s) work:rest exercise protocols (total exercise time 8 min). Each trial was followed by a performance run to volitional exhaustion at the same running speed. Testing order was randomized and counterbalanced. Heart rate, oxygen consumption, respiratory exchange ratio, and blood glucose were similar between trials (P > 0.05). Blood lactate concentration was greater during the long than the short exercise protocol (P < 0.05), whereas blood pH was lower during the long than the short exercise protocol (7.28, s = 0.11 and 7.30, s = 0.03 at 20 min, respectively; P < 0.05). Perceptions of effort were greater throughout exercise for the long than the short exercise protocol (16.6, s = 1.4 and 15.1, s = 1.6 at 20 min, respectively; P < 0.05) and correlated with blood lactate (r = 0.43) and bicarbonate concentrations (r = ?0.59; P < 0.05). Although blood lactate concentration at 20 min was related to performance time (r = ?0.56; P < 0.05), no differences were observed between trials for time to exhaustion (short exercise protocol: 95.8 s, s = 30.0; long exercise protocol: 92.0 s, s = 37.1) or physiological responses at exhaustion (P > 0.05). Our results demonstrate that 20 min of intermittent exercise involving a long work:rest duration elicits greater metabolic and perceptual strain than intermittent exercise undertaken with a short work:rest duration but does not affect subsequent run time to exhaustion. 相似文献
105.
Mike McLinden 《Teaching in Higher Education》2017,22(3):373-388
This conceptual paper contributes to the literature base on promoting equality of opportunity for students in higher education through seeking to broaden understanding of the influences on part-time study in the United Kingdom (UK). These students constitute a significant proportion of the total student population in the UK with research highlighting particular issues they encounter in their learning experience. An analysis of these issues suggests multiple sources of influence within a complex higher education landscape. Bronfenbrenner’s ecological systems theory is drawn upon as a lens through which to examine proximal and distal influences on part-time students and their study experiences in higher education and to propose a research design to facilitate future participation. The paper has significance for educators and researchers concerned with developing understanding of the multilayered influences on participation in higher education in a rapidly changing educational landscape in order to ensure equality of opportunity for all students. 相似文献
106.
One reason we have difficulty finding sustainable solutions is in part because we are unable to see the bigger picture. Capra (2000) argues, “To become ecologically literate we must learn to think systemically – in terms of connectedness, context and processes” (p. 270). We have attempted to structure connected learning experiences through our transdisciplinary approach to teaching for learning science, mathematics and ecological aspects of society and environment. We support Jucker's (2002) view that we must have lateral rigor across disciplines and vertical rigor within disciplines in order to best prepare students for teaching. This paper explores the theoretical underpinning of this complex approach to undergraduate teaching and reports on how our teaching team has worked collaboratively to structure a sequence of three, one semester integrated, core courses that explicitly uses an educating for ecological sustainability theme as the basis for each course and associated assessment. 相似文献
107.
Mike Markel 《Technical Communication Quarterly》2005,14(2):197-214
U.S. businesses wish to continue to profit by collecting personal information from their website visitors, yet they fear that the practice both alienates visitors and exposes them both to legal problems from U.S. authorities and business sanctions from data-privacy authorities in Europe and Canada. This dilemma is reflected in the typical corporate privacy-policy statement, which is full of misleading and deceptive rhetoric intended to cover up the gap between the company's privacy policy and the image it wishes to project. 相似文献
108.
Mike O'Donnell 《British Journal of Sociology of Education》1989,10(4):495-500
109.
Edmund J. S. Sonuga‐Barke Jim Stevenson Margaret Thompson Mike Lamparelli Mandy Goldfoot 《教育心理学》1995,15(2):141-148
The present study set out to examine the role played by preschool children's intellectual and behavioural characteristics in their parents’ expectations for school performance. Preschool children who were expected by their parents to attend university were compared with those who were expected to leave school at the earliest opportunity. Children whose parents had lower expectations came from lower social classes and tended to be boys. The two groups differed in a number of other ways. The high expectations group tended to be more intelligent and less overactive. When the associations between expectations, sex and SES were controlled for, these differences persisted. The findings show that there is already an association between high educational expectations and educational advantage before children enter school. Educationalists should be cautious when developing policy on the basis of the assumption that the reported association between parental expectations and school achievement reflects the impact of expectations rather than the persistence of early acquired competence. 相似文献
110.