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The ability of infants aged 8–12 months to coordinate their arm and trunk movements to contact an object located in different positions was investigated in 2 experiments. In the first, 8- and 10-month-old infants reached for near objects but both reached and leaned for more distant ones indicating that they perceived that forward leaning extends the range of contact beyond that of reaching alone. In addition, arm and trunk movements were initiated simultaneously; visual information concerning object distance was sufficient to activate an integrated reaching-and-leaning response. Object distances were increased and a mechanical aid was provided on half the trials in the second experiment with 10- and 12-month-old infants. For both age groups the degree of leaning was reduced for objects that were out of reach without the aid. Only older infants were able to use the aid to extend partially their range of contact. Overall the results support the conclusions that, by at least 8 months, infants perceive that leaning extends their effective reaching space; by 10 months they perceive the limits within which reaching together with leaning is likely to be effective; and by 12 months they begin to perceive how this space may be extended by a mechanical aid. 相似文献
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论外语教学行动研究的重要性 总被引:1,自引:0,他引:1
This article mainly gives a brief introduction to the general idea of Action Research and the wayshow it can be applied in the foreign languages teaching. A very practical teaching approach can be derived fromthe study of Action Research,and so we can do something better to manage how to teach to learn and how tolearn to teach well in the real situation. 相似文献
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Laurice M. Joseph Moira Konrad Gary Cates Terra Vajcner Elisha Eveleigh Katelyn M. Fishley 《Psychology in the schools》2012,49(2):122-136
Studies that examined copy‐cover‐compare (CCC) and variations of this procedure were reviewed and analyzed. This review revealed a substantial number of studies that validated the use of CCC across spelling and math skills and across students with and without disabilities. A meta‐analysis of findings indicated that CCC and variations of this procedure were effective for helping students acquire and become fluent in academic skills. The strongest effects were evident when CCC and variations of this procedure were combined with other evidence‐based instructional components. Limitations, future directions for research, and recommendations for practice are offered. © 2011 Wiley Periodicals, Inc. 相似文献
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Laura Bassette Shannon Titus-Dieringer Kim Zoder-Martell McKenzie Cremeans 《Psychology in the schools》2020,57(9):1439-1456
School psychologists are well-positioned to assist practitioners in engaging students in physical activity (PA) which can increase student access to improved well-being and associated health benefits. This may be of particular importance for adolescents with moderate to severe developmental disabilities (DD; autism and intellectual disability) who display various deficits in performing PA skills. Previous research suggests video-based instruction (VBI) effectively facilitated independence associated with PA skills in people with DD, however, additional research is warranted. The purpose of this study was to evaluate the degree a VBI impacted acquisition of skills in individuals with DD at school, and, subsequently, in a community setting. Multiple probe design was used to assess the effect of the intervention in four participants. The results indicate the intervention was effective in teaching three participants to perform the circuit in the school setting and transfer the skills to the community setting; however, maintenance was variable. Implications related to practice for school psychologists, teachers, and other practitioners, as well as, limitations and future research directions are discussed. 相似文献
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Maximal work production following two levels of artificially induced metabolic alkalosis 总被引:1,自引:1,他引:1
D C McKenzie K D Coutts D R Stirling H H Hoeben G Kuzara 《Journal of sports sciences》1986,4(1):35-38
In order to determine the influence of two artificially induced alkalotic states on the ability to perform maximal exercise, six male subjects (mean age, 22.0 years; mean height, 176.8 cm; mean weight, 69.1 kg; mean VO2 max, 3.83 l min-1) were studied during three experimental trials. The subjects performed six 60-s cycling bouts, at a work rate corresponding to 125% VO2 max, with 60 s recovery between work bouts; these regimens were performed 1 h after the ingestion of a solution containing either; I, placebo; II, NaHCO3 in a dosage of 0.15 g per kg body weight; or III, NaHCO3 0.30 g per kg body weight. The sixth work bout was continued until the pedal velocity dropped below 50 rev min-1. Total work done for the entire work period was calculated. Blood samples were taken from a forearm vein prior to the exercise bouts for analysis of pH and HCO3. The results showed a significant pre-exercise difference in pH and HCO3 for all conditions (P less than 0.01). In conditions where artificial alkalosis had been achieved prior to exercise there was significant increase in the work produced: I, 121.6 kJ; II, 133.1 kJ; III, 133.5 kJ (P less than 0.05). The time to fatigue in the six bout was also significantly increased; I, 74.7 s; II, 111.0 s; III, 106.0 p (P less than 0.05). There were no significant differences between conditions II and III. Thus augmentation of the bicarbonate reserves has a significant positive effect on the energy metabolism in interval-type exercise, leading to an increase in the work done and in the time to fatigue.(ABSTRACT TRUNCATED AT 250 WORDS) 相似文献
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Herbert Joseph Schoener III Kathryn Bell McKenzie 《Equity & Excellence in Education》2016,49(3):284-299
Although much of the current educational research literature on achievement gaps has focused on core curricular areas in public schools, few have focused on racially identifiable gaps in non-core areas such as high school foreign languages. These achievement, and thus advancement, gaps often result in the under-representation of students of color in higher level foreign language classes. This can have long-range negative consequences for students, such as lacking the foreign language credits needed for admission into major universities. Thus, in this qualitative study, we researched the perceptions of teachers, counselors, and school leaders at a racially diverse urban high school in central Texas concerning the enrollment, achievement, and advancement of African American students in high school foreign language courses. The results indicate that equity traps—deficit views, racial erasure, and paralogical beliefs and behaviors—advanced over a decade ago (McKenzie &; Scheurich, 2004) are continuing and even thriving among teachers, counselors, and school leaders in public schools. These equity traps contribute to the foreign language achievement gap, resulting in diminished educational opportunities for African American students. Moreover, we propose that an additional equity trap is at play—organizational constraints—which are the structural obstacles that serve to abet and perpetuate the negative beliefs, behaviors, attitudes, and assumptions exposed in the original equity traps. We conclude this article with recommendations for policy makers and practitioners and offer direction for future research. 相似文献
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