全文获取类型
收费全文 | 735篇 |
免费 | 20篇 |
专业分类
教育 | 556篇 |
科学研究 | 40篇 |
各国文化 | 27篇 |
体育 | 36篇 |
综合类 | 3篇 |
文化理论 | 6篇 |
信息传播 | 87篇 |
出版年
2022年 | 4篇 |
2021年 | 9篇 |
2020年 | 18篇 |
2019年 | 32篇 |
2018年 | 27篇 |
2017年 | 31篇 |
2016年 | 28篇 |
2015年 | 16篇 |
2014年 | 30篇 |
2013年 | 149篇 |
2012年 | 18篇 |
2011年 | 32篇 |
2010年 | 25篇 |
2009年 | 23篇 |
2008年 | 16篇 |
2007年 | 21篇 |
2006年 | 22篇 |
2005年 | 18篇 |
2004年 | 11篇 |
2003年 | 19篇 |
2002年 | 17篇 |
2001年 | 10篇 |
2000年 | 7篇 |
1999年 | 13篇 |
1998年 | 9篇 |
1997年 | 9篇 |
1996年 | 8篇 |
1995年 | 14篇 |
1994年 | 7篇 |
1993年 | 8篇 |
1992年 | 14篇 |
1991年 | 7篇 |
1990年 | 6篇 |
1989年 | 8篇 |
1988年 | 7篇 |
1987年 | 8篇 |
1986年 | 4篇 |
1985年 | 3篇 |
1984年 | 4篇 |
1982年 | 3篇 |
1981年 | 6篇 |
1980年 | 3篇 |
1979年 | 5篇 |
1978年 | 3篇 |
1977年 | 3篇 |
1976年 | 4篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1967年 | 2篇 |
1835年 | 2篇 |
排序方式: 共有755条查询结果,搜索用时 15 毫秒
731.
732.
Robin L. Peterson Bruce F. Pennington Richard K. Olson Sally J. Wadsworth 《Scientific Studies of Reading》2014,18(5):347-362
Limited evidence supports the external validity of the distinction between developmental phonological and surface dyslexia. We previously identified children ages 8 to 13 meeting criteria for these subtypes (Peterson, Pennington, & Olson, 2013) and now report on their reading and related skills approximately 5 years later. Longitudinal stability of subtype membership was fair and appeared stronger for phonological than surface dyslexia. Phonological dyslexia was associated with a pronounced phonological awareness deficit, but subgroups otherwise had similar cognitive profiles. Subtype did not inform prognosis. Results provide modest evidence for the validity of the distinction, although not for its clinical utility. 相似文献
733.
The Relationship Between “Teen Mom” Reality Programming and Teenagers' Beliefs About Teen Parenthood
A survey was conducted with U.S. high school students (M = 16.57 years of age) from the Midwest to examine whether exposure to “teen mom” reality programming (e.g., 16 and Pregnant, Teen Mom) was related to teens' perceptions of teen parenthood. Contrary to our hypotheses, analyses revealed that exposure to teen mom reality programming was related to an increased tendency to believe that teen mothers have an enviable quality of life, a high income, and involved fathers. Teens who perceived reality television as realistic were most likely to hold these perceptions. The findings are discussed in terms of cultivation theory. 相似文献
734.
A comparison of the physiological response to simulated altitude exposure and r-HuEpo administration
Michael J. Ashenden Allan G. Hahn David T. Martin Peter Logan Robin Parisotto Christopher J. Gore 《Journal of sports sciences》2013,31(11):831-837
Concerns have been raised about the morality of using simulated altitude facilities in an attempt to improve athletic performance. One assumption that has been influential in this debate is the belief that altitude houses simply mimic the physiological effects of illegal recombinant human erythropoietin (r-HuEpo) doping. To test the validity of this assumption, the haematological and physiological responses of 23 well-trained athletes exposed to a simulated altitude of 2650-3000 m for 11-23 nights were contrasted with those of healthy volunteers receiving a low dose (150 IU·kg-1 per week) of r-HuEpo for 25 days. Serial blood samples were analysed for serum erythropoietin and percent reticulocytes; maximal oxygen uptake ([Vdot]O2max) was assessed before and after r-HuEpo administration or simulated altitude exposure. The group mean increase in serum erythropoietin (422% for r-HuEpo vs 59% for simulated altitude), percent reticulocytes (89% vs 30%) and [Vdot]O2max (6.6% vs -2.0%) indicated that simulated altitude did not induce the changes obtained with r-HuEpo administration. Based on the disparity of these responses, we conclude that simulated altitude facilities should not be considered unethical based solely on the tenet that they provide an alternative means of obtaining the benefits sought by illegal r-HuEpo doping. 相似文献
735.
We analyse a rich dataset of Economics students at a UK university to identify causal effects of class absence on student performance, exploiting the random assignment of students and information on students’ class timetables to avoid selection problems. We use panel properties of the data to control for unobserved student factors such as ability and effort. Quantile regression results suggest that absence has adverse effects on performance – but these effects are causal only for the upper part of the conditional performance distribution. 相似文献
736.
737.
Namik Kirlic Janna M. Colaizzi Kelly T. Cosgrove Zsofia P. Cohen Hung-Wen Yeh Florence Breslin Amanda S. Morris Robin L. Aupperle Manpreet K. Singh Martin P. Paulus 《Child development》2021,92(5):2035-2052
This study used a machine learning framework in conjunction with a large battery of measures from 9,718 school-age children (ages 9–11) from the Adolescent Brain Cognitive DevelopmentSM (ABCD) Study to identify factors associated with fluid cognitive functioning (FCF), or the capacity to learn, solve problems, and adapt to novel situations. The identified algorithm explained 14.74% of the variance in FCF, replicating previously reported socioeconomic and mental health contributors to FCF, and adding novel and potentially modifiable contributors, including extracurricular involvement, screen media activity, and sleep duration. Pragmatic interventions targeting these contributors may enhance cognitive performance and protect against their negative impact on FCF in children. 相似文献
738.
This research investigated how student social interactions within two approaches to an inquiry-based science curriculum could be related to student motivation and achievement outcomes. This qualitative case study consisted of two cases, Off-Campus and On-Campus, and used ethnographic techniques of participant observation. Research participants included eight eighth grade girls, aged 13–14 years old. Data sources included formal and informal participant interviews, participant journal reflections, curriculum artifacts including quizzes, worksheets, and student-generated research posters, digital video and audio recordings, photographs, and researcher field notes. Data were transcribed verbatim and coded, then collapsed into emergent themes using NVIVO 9. The results of this research illustrate how setting conditions that promote focused concentration and communicative interactions can be positively related to student motivation and achievement outcomes in inquiry-based science. Participants in the Off-Campus case experienced more frequent states of focused concentration and out performed their peers in the On-Campus case on 46 % of classroom assignments. Off-Campus participants also designed and implemented a more cognitively complex research project, provided more in-depth analyses of their research results, and expanded their perceptions of what it means to act like a scientist to a greater extent than participants in the On-Campus case. These results can be understood in relation to Flow Theory. Student interactions that promoted the criteria necessary for initiating flow, which included having clearly defined goals, receiving immediate feedback, and maintaining a balance between challenges and skills, fostered enhanced student motivation and achievement outcomes. Implications for science teaching and future research include shifting the current focus in inquiry-based science from a continuum that progresses from teacher-directed to open inquiry experiences to a continuum that also deliberately includes and promotes the necessary criteria for establishing flow. Attending to Flow Theory and incorporating student experiences with flow into inquiry-based science lessons will enhance student motivation and achievement outcomes in science and bolster the success of inquiry-based science. 相似文献
739.
Active‐learning labs for two topics in high school biology were developed through the collaboration of high school teachers and university faculty and staff and were administered to 408 high school students in six classrooms. The content of instruction and testing was guided by State of Texas science objectives. Detailed teacher records describing daily classroom activities were used to operationalize two types of instruction: active learning, which used the labs; and traditional, which used the teaching resources ordinarily available to the teacher. Teacher records indicated that they used less independent work and fewer worksheets, and more collaborative and lab‐based activities, with active‐learning labs compared to traditional instruction. In‐class test data show that students gained significantly more content knowledge and knowledge of process skills using the labs compared to traditional instruction. Questionnaire data revealed that students perceived greater learning gains after completing the labs compared to covering the same content through traditional methods. An independent questionnaire administered to a larger sample of teachers who used the lab‐based curriculum indicated that they perceived changing their behaviors as intended by the student‐centered principles of the labs. The major implication of this study is that active‐learning–based laboratory units designed and developed collaboratively by high school teachers and university faculty, and then used by high school teachers in their classrooms, can lead to increased use of student‐centered instructional practices as well as enhanced content knowledge and process learning for students. © 2007 Wiley Periodicals, Inc. J Res Sci Teach 44: 960–979, 2007 相似文献
740.
Justin C. Wise Hye Kyeong Pae Christopher B. Wolfe Rose A. Sevcik Robin D. Morris Maureen Lovett Maryanne Wolf 《Learning disabilities research & practice》2008,23(3):125-136
Limited research has examined the skills of children with a reading disability (RD) and children with RD and a mathematics disability (MD). Even less research has examined the phonological awareness (PA) and rapid automatized naming (RAN) skills in these two groups of children and how these skills relate to reading and math achievement. Additionally, various classification criteria are frequently implemented to classify children with MD. The purpose of this study, therefore, was to examine the PA and RAN skills in children who met different criteria for RD only and children with RD who are at risk for mathematics difficulties (MDR). Participants were 114 second‐ or third‐grade students with RD from public elementary schools in three large metropolitan areas. Students were classified as at risk for mathematics difficulties utilizing a 25th‐percentile cutoff and a 15th‐percentile cutoff as assessed by the KeyMath‐Revised Test ( Connolly, 1988 ). A series of PA and RAN measures were administered along with a range of reading and mathematics measures. Hierarchical regression analyses indicated that children with RD only evidenced a different pattern of results compared to children with RD + MDR. Additionally, using a more stringent criterion to classify children at risk for mathematics difficulties resulted in a differential pattern of results when compared to a less stringent classification criterion. 相似文献