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121.
Development and validation of a method to directly measure the cable force during the hammer throw 总被引:1,自引:0,他引:1
Brice SM Ness KF Rosemond D Lyons K Davis M 《Sports biomechanics / International Society of Biomechanics in Sports》2008,7(2):274-287
The development of cable force during hammer-throw turns is crucial to the throw distance. In this paper, we present a method that is capable of measuring cable force in real time and, as it does not interfere with technique, it is capable of providing immediate feedback to coaches and athletes during training. A strain gauge was mounted on the wires of three hammers to measure the tension in the wire and an elite male hammer thrower executed three throws with each hammer. The output from the gauges was recorded by a data logger positioned on the lower back of the thrower. The throws were captured by three high-speed video cameras and the three-dimensional position of the hammer's head was determined by digitizing the images manually. The five best throws were analysed. The force acting on the hammer's head was calculated from Newton's second law of motion and this was compared with the force measured via the strain gauge. Qualitatively the time dependence of the two forces was essentially the same, although the measured force showed more detail in the troughs of the force-time curves. Quantitatively the average difference between the measured and calculated forces over the five throws was 76 N, which corresponds to a difference of 3.8% for a cable force of 2000 N. 相似文献
122.
Doug Enders 《Clearing house (Menasha, Wis.)》2013,86(2):62-67
Learning is a concept that is routinely used in various educational settings, and the enhancement of learning is the primary goal of many, if not all, educators and administrators. People involved in education, however, may not necessarily have extensively explored this commonly cited notion, and some may not have subsequently realized the conceptual depth and variations that learning entails in developing classroom materials and practices. For example, learning may be domain specific, and may involve a wide variety of processes and expressions. Additionally, it is linked to an array of factors, including individual differences, such as temperament, and culturally relative dimensions, such as value priorities. This article discusses implications for classroom practices to facilitate educators’ application of this complex concept. 相似文献
123.
David T. Burkam Laura LoGerfo Doug Ready Valerie E. Lee 《Journal of Education for Students Placed at Risk》2013,18(2):103-136
We use the Early Childhood Longitudinal Study to investigate national patterns addressing (a) who repeats kindergarten, and (b) the subsequent cognitive effects of this event. Using OLS regression techniques, we investigate 1st-time kindergartners who are promoted, 1st-time kindergartners who are retained, and children who are already repeating kindergarten. Boys, children from low socioeconomic backgrounds, and children who enter kindergarten younger than typical age standards are consistently at risk for repeating kindergarten, but racial/ethnic patterns differ across the 2 cohorts of kindergarten repeaters. Evidence suggests that repeating kindergarten rarely leads to cognitive benefits in literacy or mathematics performance. On average, kindergarten repeaters continue to perform below their peers in terms of literacy skills both at the end of kindergarten and at the end of first grade (effect size [ES] = ?0.20 and ?0.24, respectively). In mathematics, the performance differentials are smaller but remain statistically significant. Evidence suggests that these differences vary somewhat by children's background and the school setting. Most children appear to receive little or no cognitive benefit from repeating kindergarten, suggesting the need for a careful reconsideration of current retention practices. 相似文献
124.
Doug Pauley 《Community College Journal of Research & Practice》2013,37(1):5-15
Central Community College (CCC; Columbus, Nebraska) has taken the lead in several business, industry, and educational collaborations, beginning locally, then expanding statewide. This article shares two models that other community colleges may wish to replicate. The first describes the development of a collaborative team. The second shows that, by using the collaborative team approach, community colleges can generate substantial increases in both funding and full-time equivalents (a basis for community college funding inNebraska)while serving business andindustry.For example, since June 1998 CCC has generated nearly $1.4 million for its business and industry training programs. As a result of collaboration among CCC, the Nebraska Community College System, government agencies, and business and industry, the Statewide Interactive Multimedia Training Library was established. 相似文献
125.
Doug Ogilvie 《School Leadership & Management》2013,33(4):365-373
The specialist schools programme is currently seen by policy makers as a way of transforming the comprehensive education system, and meeting the local needs of parents for diversity and excellence. Insofar as this policy has an evidence-base this has been provided by studies showing higher levels of attainment among existing specialist schools. This article shows that if these advantages occur then there is a danger that they do so at a cost in terms of inclusion. The existing specialist schools have also shown a greater tendency to take proportionately fewer children from poor families over time, especially where these schools are also their own admission authorities. If this trend continues it will exacerbate the pre-existing social and economic segregation in the education system. The article ends by considering some of the implications for school organisation. 相似文献
126.
College Students’ Perceptions About the Plausibility of Human-Induced Climate Change 总被引:2,自引:0,他引:2
Overcoming students’ misconceptions may be a challenge when teaching about phenomena such as climate change. Students tend
to cite short-term weather effects as evidence to support or refute long-term climate transformations, which displays a fundamental
misunderstanding about weather and climate distinctions. Confusion about weather and climate may also reflect student misunderstanding
about deep time, a concept that spans several scientific content areas. This study examines the relationships between students’
understanding of deep time and their understandings of the distinctions between weather and climate, as well as how these
understandings influence students’ perceptions about the plausibility of human-induced global climate change. Undergraduate
students enrolled in an introductory science class on global climate change completed measures of their (a) understanding
of distinctions between weather and climate, (b) knowledge of deep time, and (c) plausibility perceptions of human-induced
climate change, both at the beginning and end of the course. The study includes comparison groups of similar students enrolled
in introductory physical geography classes. Results revealed that greater knowledge of deep time and increased plausibility
perceptions of human-induced climate change provide significant explanation of variance in students’ understanding of weather
and climate distinctions. Furthermore, students achieve significantly increased understanding of weather and climate, even
with brief instruction. 相似文献
127.
Craig S. Galbraith Gregory B. Merrill Doug M. Kline 《Research in higher education》2012,53(3):353-374
In this study we investigate the underlying relational structure between student evaluations of teaching effectiveness (SETEs)
and achievement of student learning outcomes in 116 business related courses. Utilizing traditional statistical techniques,
a neural network analysis and a Bayesian data reduction and classification algorithm, we find little or no support for the
validity of SETEs as a general indicator of teaching effectiveness or student learning. In fact, the underlying structure
appears to be non-linear and possibly negatively bimodal where the most effective instructors are within the middle percentiles
of student course ratings, while instructors receiving ratings in the top quintile or the bottom quintile are associated with
significantly lower levels of student achievement. 相似文献
128.
ABSTRACT Today, e‐learning is a common delivery media for education and training within many organizations. Yet, while both the supply and demand for e‐learning opportunities has risen in recent years, many professionals are beginning to question whether e‐learn‐ers are prepared to be successful in an online learning environment (e.g., Gug‐lielmino & Guglielmino, 2003; Watkins & Corry, 2005). After all, a learner's demonstrated success in a conventional education and training classroom may not be an adequate predictor of success in an e‐learning classroom. One way of gauging a potential online learner's readiness is through self‐assessment. As a first step in defining an instrument that measures an e‐learner's readiness, with the cooperation of volunteer participants from the U.S. Coast Guard, this study looked into the validity and internal consistency of items within a self‐assessment of e‐learning readiness that is under development, and provided data for the continuing development and revision of the instrument. Having demonstrated evidence of internal consistency and construct validity, the self‐assessment now provides a tool for continuing research into the prediction of e‐learning performance. Funding for this study was provided by the International Society for Performance Improvement. 相似文献
129.
Two hundred twenty-nine health sciences libraries (HSLs) worldwide were surveyed regarding the availability of digital collections, evidence of the type of digital collections, level of access, software used, and HSL type. Of the surveyed libraries, 69% (n = 157) had digital collections, with an average of 1,531 items in each collection; 49% (n = 112) also had institutional repositories. In most cases (n = 147), these collections were publicly available. The predominant platforms for disseminating these digital collections were CONTENTdm and library web pages. Only 50% (n = 77) of these collections were managed by the health sciences library itself. 相似文献
130.
Doug Leigh 《Performance Improvement Quarterly》2014,27(2):7-34
Kaufman ( 2006a , 2011 ) defines Ideal Visions as measurable statements of the kind of world an organization, as well as its associates and external stakeholders, commits to help create for the future. This study investigated the relationships among several research‐supported variables regarding personality aspects and individual characteristics with indicators of individuals’ motivation to achieve goals aimed at adding value to external clients and society. Indicators of generative beliefs, values, individual differences, and commitment to an Ideal Vision were examined in this study. Generativity (the concern in establishing and guiding the next generation), membership and activity in a formal civic organization, and gender, each demonstrated a statistically significant relationship with commitment to an Ideal Vision. In addition, various values were ranked differentially by those with relatively high versus low commitment to an Ideal Vision. A discussion of how these variables warrant the ongoing investigation into these variables is provided. 相似文献