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331.
332.
Rickey E. Carter 《Teaching Statistics》2010,32(3):90-91
Statistical adjustments to accommodate multiple comparisons are routinely covered in introductory statistical courses. The fundamental rationale for such adjustments, however, may not be readily understood. This article presents a simple illustration to help remedy this. 相似文献
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Connie L. Kvarfordt Irene Carter Wansoo Park Sung Hyun Yun 《Journal of Teaching in Social Work》2013,33(5):545-563
Teaching research to social work students continues to be the topic of an ongoing dialog within the profession. The literature suggests that some form of a “real-world” or “hands-on” learning opportunity has many benefits for teaching a subject that students often are reluctant to engage in. Using online survey methods, researchers gathered feedback from graduate students and their field supervisors about their experience of completing a field seminar that integrated an agency-based research proposal as part of the course requirement. Although there were limitations to this approach, many of the same benefits of actually implementing research were reported by students who completed only a proposal. 相似文献
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This paper reports on selected aspects of data, with special reference to science, derived from a survey of primary school teachers as part of the Leverhulme Primary Project at the University of Exeter. A national sample of teachers (N = 901) across 152 schools was surveyed in order to ascertain teachers’ perceptions of competence and needs with respect to the new National Curriculum in the UK. Initially, data were collected in relation to ten subject areas and generic teaching skills, with provision made for free‐form responses concerning National Curriculum implementation. Selected aspects of these data, principally related to the National Curriculum core area of science, were subjected to detailed further analysis and are reported. Variables identified from the survey findings, and of concern to science educators, included early subject specialism, years of teaching and gender. These were probed for relationships and significance. The tension between competing National Curriculum requirements for specialist subject knowledge and generalist teaching skills was explored. Findings have implications for innovation in approaches to staff development to cater for perceived needs, teacher educators and curriculum alignment. 相似文献
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The aim of this study was to assess the responses of blood lactate and pyruvate during the lactate minimum speed test. Ten participants (5 males, 5 females; mean +/- s: age 27.1 +/- 6.7 years, VO 2max 52.0 +/- 7.9 ml kg -1 min -1 ) completed: (1) the lactate minimum speed test, which involved supramaximal sprint exercise to invoke a metabolic acidosis before the completion of an incremental treadmill test (this results in a ‘U-shaped’ blood lactate profile with the lactate minimum speed being defined as the minimum point on the curve); (2) a standard incremental exercise test without prior sprint exercise for determination of the lactate threshold; and (3) the sprint exercise followed by a passive recovery. The lactate minimum speed (12.0 +/- 1.4 km h -1 ) was significantly slower than running speed at the lactate threshold (12.4 +/- 1.7 km h -1 ) (P < 0.05), but there were no significant differences in VO 2 , heart rate or blood lactate concentration between the lactate minimum speed and running speed at the lactate threshold. During the standard incremental test, blood lactate and the lactate-topyruvate ratio increased above baseline values at the same time, with pyruvate increasing above baseline at a higher running speed. The rate of lactate, but not pyruvate, disappearance was increased during exercising recovery (early stages of the lactate minimum speed incremental test) compared with passive recovery. This caused the lactate-to-pyruvate ratio to fall during the early stages of the lactate minimum speed test, to reach a minimum point at a running speed that coincided with the lactate minimum speed and that was similar to the point at which the lactate-to-pyruvate ratio increased above baseline in the standard incremental test. Although these results suggest that the mechanism for blood lactate accumulation at the lactate minimum speed and the lactate threshold may be the same, disruption to normal submaximal exercise metabolism as a result of the preceding sprint exercise, including a three- to five-fold elevation of plasma pyruvate concentration, makes it difficult to interpret the blood lactate response to the lactate minimum speed test. Caution should be exercised in the use of this test for the assessment of endurance capacity. 相似文献
339.
Laurent Bosquet Antoine Duchene Paul Raoul Delhors Gregory Dupont Helen Carter 《Journal of sports sciences》2013,31(6):663-670
Abstract The aim of this study was to compare maximal accumulated oxygen deficit (hereafter O2 deficit) estimated from the methods of Whipp et al. (1986), Medbo et al. (1988), and Hill et al. (1998) to determine whether they agree sufficiently to be used interchangeably. Nineteen moderately to highly trained endurance runners first performed an incremental test to exhaustion for the determination of maximal oxygen uptake ([Vdot]O2max) and peak treadmill speed, followed by six randomly ordered constant-speed tests at 95, 100, 105, 110, 110, and 120% of peak treadmill speed. All tests were separated by at least 72 h and were performed within 4 weeks. The method of Whipp produced an O2 deficit estimate that was lower than that derived from the method of Hill or Medbo (bias ± 95% limits of agreement: ?29.6 ± 36.6 and ?26.1 ± 32.8 ml · kg?1, respectively; P < 0.001). The O2 deficit did not differ between the methods of Hill and Medbo (bias ± 95% limits of agreement: 3.5 ± 41.6 ml · kg?1; n.s.). However, poor correlations (0.21 < r < 0.33; n.s.) together with wide limits of agreement between O2 deficit estimates (70 – 80% of the mean response) clearly question using these methods interchangeably. 相似文献
340.
Abstract In this study, we assessed arm coordination in the backstroke over increasing speeds by adapting the index of coordination originally used in the front crawl. Fourteen elite male backstroke swimmers swam four trials of 25 m at the speeds corresponding to the 400-m, 200-m, 100-m, and 50-m events. The six phases of the arm stroke were identified by video analysis and then used to calculate the index of coordination, which corresponded to the time between the propulsive phases of the two arms. With increases in speed, the elite swimmers increased the stroke rate, the relative duration of their arm pull, and their index of coordination, and decreased the distance per stroke (P < 0.05). Arm coordination was always in catch-up (index of coordination of ?12.9%) because the alternating body-roll and the small shoulder flexibility did not allow the opposition or superposition coordination seen in the front crawl. This new method also quantified the relative duration of the hand's lag time at the thigh, which did not change (~2%) with increasing speed for the elite swimmers. The index of coordination enables coaches to assess mistakes in backstroke coordination, particularly in the hand's lag time at the thigh. 相似文献