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41.
Learning & Behavior - Right-lever presses by hooded rats in three groups produced reinforcers at variable-intervals that differed over five conditions. The groups differed by virtue of the... 相似文献
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Murray A Aitchison TC Ross G Sutherland K Watt I McLean D Grant S 《Journal of sports sciences》2005,23(9):927-935
The aim of this study was to compare sprint performance over 10 and 20 m when participants ran while towing resistances, weighing between 0 and 30% of body mass. The sample of 33 participants consisted of male rugby and soccer players (age 21.1 +/- 1.8 years, body mass 83.6 +/- 13.1 kg, height 1.82 +/- 0.1 m; mean +/- s). Each participant performed two sets of seven sprints over 20 m using a Latin rectangular design. The times were recorded at 10 and 20 m using electronic speed gates. The sprints of 13 players were video-recorded to allow calculation of stride length and frequency. For both sprints, a quadratic relationship was observed between sprint time and resistance as sprint time increased from 2.94 s to 3.80 s from 0 to 30% resistance. This relationship was statistically significant but considered not to be meaningful for performance because, over the range of resistances used in this study, the quadratic model was never more than 1% (in terms of sprint time) from the linear model. As resistance increased, the stride length shortened, with mean values of 1.63 +/- 0.13 m at 0% body mass and 1.33 +/- 0.13 m at 30% of body mass. There was no significant change in stride frequency with increasing resistance. The results show that in general there is an increase in sprint time with an increase in resistance. No particular resistance in the range tested (0 - 30%) can be recommended for practice. 相似文献
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Ryan S. McGinnis Stephen M. Cain Steven P. Davidson Rachel V. Vitali Noel C. Perkins Scott G. McLean 《Sports Engineering》2016,19(1):21-34
We present a method for quantifying sacral kinematics during countermovement jumping (CMJ) using an inertial measurement unit (IMU). The IMU-derived sacral kinematic trajectories reproduced motion capture acceleration, velocity, and displacement to within mean (standard deviation) differences of 0.024 (0.088) m/s2, 0.023 (0.026) m/s, and 0.003 (0.032) m, respectively, across 252 jumps performed by 14 subjects. The method also quantified differences in maximum sacral displacement to within 1 % and differences in maximum propulsive velocity to within 0.7 % of motion capture estimates. This builds upon existing IMU-based methods for quantifying jump performance, which do not provide sacral kinematic trajectories. The utility of this method is demonstrated by its ability to discriminate jump performance metrics across a diverse subject population. In particular, we found that 21 participants adopted multiple strategies to maximize jump height in unloaded and loaded fresh conditions, but converged to a common strategy when jumping fatigued and under load. Changes in kinematic parameters were evident across conditions, and several changes were significantly associated with changes in jump performance (i.e., height). These parameters include changes in the depth of the countermovement, duration of the propulsive phase and maximum propulsive velocity. Collectively, these results point toward the future use of this method in naturalistic environments and for multiple objectives including biomechanical performance assessment and tracking, fatigue assessment, and jump training. 相似文献
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Noordeen Gangani Gary N. McLean Richard A. Braden 《Performance Improvement Quarterly》2006,19(1):127-139
This article explores some of the major issues in developing and implementing a competency‐based human resource development strategy. The article summarizes a brief literature review on how competency models can be developed and implemented to improve employee performance. A case study is presented of American Medical Systems (AMS), a mid‐sized health‐care and medical device company, where the model is being used to improve employee performance and gain a competitive advantage. 相似文献
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Michelle McLean 《Teaching in Higher Education》2013,18(3):399-413
The conceptions of learning that students hold and how these change are dependent on several factors, including their schooling, personal traits of students and the academic environment of the tertiary institute (e.g. departmental policies, attitudes and behaviour of staff). This document discusses whether the conceptions of learning students (in this case, second year medical students) hold can be related to their academic ability. From a phenomenographic perspective (Marton et al., 1993), it would appear that students who were selected in the present study for their good academic record expressed more transformative conceptions of learning than did their less academically achieving peers, who appeared to rely on memorisation and recall. Based on the results of this study, 'academic ability' might then be a reflection of the conceptions of learning students hold. It would be interesting to extend this study to include students in other disciplines, experiencing other curricula and at different year levels. 相似文献
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Tony Harland Angela McLean Rob Wass Ellen Miller Kwong Nui Sim 《Assessment & Evaluation in Higher Education》2015,40(4):528-541
This research questions the impact of assessment on university teaching and learning in circumstances where all student work is graded. Sixty-two students and lecturers were interviewed to explore their experiences of assessment at an institution that had adopted a modular course structure and largely unregulated numbers of internal assessments. Lecturers rewarded student work with grades and controlled study behaviour with assessment. In some situations it was possible to experience hundreds of graded assessments in an academic year. Students were single-minded when it came to grades and would not work without them. These conditions contributed to competition for student attention and a grading arms race between academics and subjects. In this context, the spaces for achieving certain educational objectives, such as fostering self-motivated learners, were marginalised. Both students and lecturers were unsatisfied with this situation, but neither group could envisage radical change. Students were generally happy to accumulate small marks, while being irritated and stressed by frequent grading. Lecturers were aware of better practices but felt trapped by circumstances. The idea of slow scholarship is introduced to encourage a re-think of such assessment practices, support a positive shift in assessment culture and contribute to the theories of assessment. 相似文献
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Fiona McLean 《Health information and libraries journal》2003,20(4):247-248
50.
Paul Wasserman Janiece McLean Brian Rust Stefan Kanfer K. Aubrey Stone Richard F. Hixson 《Communication Booknotes Quarterly》2013,44(3):8-9
Paul Wasserman and Janiece McLean's Consultants and Consulting Organizations Directory (Detroit: Gale Research Co., 1973—$45.00), Brian Rust's The Complete Entertainment Discography from the mid-1890s to 1942 (New Rochelle, N.Y.: Arlington House, 1973—$12.95) Stefan Kanfer's A Journal of the Plague Years (New York: Atheneum, 1973—$7.95) K. Aubrey Stone's I'm Sorry, the Monopoly You Have Reached is not in Service (New York: Pallantine/Grassroots, 1973—$1.50, paper) Richard F. Hixson's Mass Media: A Casebook (New York: Crowell, 1973—price not known, paperback), Donald I. Rogers' Since You Went Away (New Rochelle, N.Y.: Arlington House, 1973—$8.95), 相似文献