全文获取类型
收费全文 | 4293篇 |
免费 | 47篇 |
国内免费 | 6篇 |
专业分类
教育 | 3333篇 |
科学研究 | 219篇 |
各国文化 | 82篇 |
体育 | 299篇 |
综合类 | 1篇 |
文化理论 | 61篇 |
信息传播 | 351篇 |
出版年
2021年 | 24篇 |
2020年 | 49篇 |
2019年 | 81篇 |
2018年 | 95篇 |
2017年 | 124篇 |
2016年 | 93篇 |
2015年 | 85篇 |
2014年 | 94篇 |
2013年 | 1095篇 |
2012年 | 70篇 |
2011年 | 94篇 |
2010年 | 70篇 |
2009年 | 96篇 |
2008年 | 107篇 |
2007年 | 95篇 |
2006年 | 98篇 |
2005年 | 91篇 |
2004年 | 82篇 |
2003年 | 96篇 |
2002年 | 80篇 |
2001年 | 68篇 |
2000年 | 69篇 |
1999年 | 64篇 |
1998年 | 57篇 |
1997年 | 62篇 |
1996年 | 63篇 |
1995年 | 61篇 |
1994年 | 50篇 |
1993年 | 54篇 |
1992年 | 50篇 |
1991年 | 60篇 |
1990年 | 52篇 |
1989年 | 55篇 |
1988年 | 43篇 |
1987年 | 39篇 |
1986年 | 46篇 |
1985年 | 56篇 |
1984年 | 30篇 |
1983年 | 42篇 |
1982年 | 41篇 |
1981年 | 43篇 |
1980年 | 32篇 |
1979年 | 63篇 |
1978年 | 32篇 |
1977年 | 47篇 |
1976年 | 33篇 |
1975年 | 31篇 |
1974年 | 37篇 |
1973年 | 24篇 |
1971年 | 23篇 |
排序方式: 共有4346条查询结果,搜索用时 0 毫秒
81.
This study used semistructured interviews and grounded theory to look for characteristics among college undergraduates that predicted persistence into Ph.D. and M.D./Ph.D. training. Participants in the summer undergraduate and postbaccalaureate research programs at the Mayo Clinic College of Medicine were interviewed at the start, near the end, and 8–12 months after their research experience. Of more than 200 themes considered, five characteristics predicted those students who went on to Ph.D. and M.D./Ph.D. training or to M.D. training intending to do research: 1) Curiosity to discover the unknown, 2) Enjoyment of problem solving, 3) A high level of independence, 4) The desire to help others indirectly through research, and 5) A flexible, minimally structured approach to the future. Web-based surveys with different students confirmed the high frequency of curiosity and/or problem solving as the primary reason students planned research careers. No evidence was found for differences among men, women, and minority and nonminority students. Although these results seem logical compared with successful scientists, their constancy, predictive capabilities, and sharp contrast to students who chose clinical medicine were striking. These results provide important insights into selection and motivation of potential biomedical scientists and the early experiences that will motivate them toward research careers. 相似文献
82.
Teachers' education, classroom quality, and young children's academic skills: results from seven studies of preschool programs 总被引:10,自引:0,他引:10
Early DM Maxwell KL Burchinal M Alva S Bender RH Bryant D Cai K Clifford RM Ebanks C Griffin JA Henry GT Howes C Iriondo-Perez J Jeon HJ Mashburn AJ Peisner-Feinberg E Pianta RC Vandergrift N Zill N 《Child development》2007,78(2):558-580
In an effort to provide high-quality preschool education, policymakers are increasingly requiring public preschool teachers to have at least a Bachelor's degree, preferably in early childhood education. Seven major studies of early care and education were used to predict classroom quality and children's academic outcomes from the educational attainment and major of teachers of 4-year-olds. The findings indicate largely null or contradictory associations, indicating that policies focused solely on increasing teachers' education will not suffice for improving classroom quality or maximizing children's academic gains. Instead, raising the effectiveness of early childhood education likely will require a broad range of professional development activities and supports targeted toward teachers' interactions with children. 相似文献
83.
84.
Alazne Aizpitarte Olivia E. Atherton Lucy R. Zheng Itziar Alonso-Arbiol Richard W. Robins 《Child development》2019,90(1):117-126
Relational aggression—a psychological form of aggression—has numerous negative consequences for physical and emotional health. However, little is known about the risk factors that lead youth to engage in relational aggression. Using multimethod data from a longitudinal research of 674 Mexican-origin youth, this study examined the influence of parents, siblings, and peers on the development of relational aggression. Increases in relational aggression from age 10 to 16 were associated with: (a) low levels of parental monitoring and (b) increased association with deviant peers and siblings. These results held across gender and nativity status. The findings suggest that multiple socialization agents contribute to the development of relational aggression. We discuss the practical implications for reducing relational aggression during adolescence. 相似文献
85.
Richard Spoth Linda Trudeau Cleve Redmond Chungyeol Shin Mark E. Feinberg Mark T. Greenberg 《Child development》2019,90(6):1847-1855
This study examines crossover effects of adolescent substance misuse preventive interventions on academic success in college. It evaluates pathways of influence on college grades, via effects on school engagement, problem-solving skills, and substance misuse in high school. Data were collected as part of an Randomized Controlled Trial (RCT) evaluating a multicomponent intervention conducted in 28 school districts with middle school students. At age 19, study participants (N = 1,488) enrolled in college reported on college grades. The model fit the data, supporting hypothesized pathways of intervention impacts. Inclusion of a significant direct effect on college grades further improved model fit. Results support the potential for universal substance misuse preventive interventions delivered by community partnerships during middle school to yield effects on long-term academic success. 相似文献
86.
Roghayeh Barmaki Kevin Yu Rebecca Pearlman Richard Shingles Felix Bork Greg M. Osgood Nassir Navab 《Anatomical sciences education》2019,12(6):599-609
Students in undergraduate premedical anatomy courses may experience suboptimal and superficial learning experiences due to large class sizes, passive lecture styles, and difficult-to-master concepts. This study introduces an innovative, hands-on activity for human musculoskeletal system education with the aim of improving students’ level of engagement and knowledge retention. In this study, a collaborative learning intervention using the REFLECT (augmented reality for learning clinical anatomy) system is presented. The system uses the augmented reality magic mirror paradigm to superimpose anatomical visualizations over the user’s body in a large display, creating the impression that she sees the relevant anatomic illustrations inside her own body. The efficacy of this proposed system was evaluated in a large-scale controlled study, using a team-based muscle painting activity among undergraduate premedical students (n = 288) at the Johns Hopkins University. The baseline knowledge and post-intervention knowledge of the students were measured before and after the painting activity according to their assigned groups in the study. The results from knowledge tests and additional collected data demonstrate that the proposed interactive system enhanced learning of the musculoskeletal system with improved knowledge retention (F(10,133) = 3.14, P < 0.001), increased time on task (F(1,275) = 5.70, P < 0.01), and a high level of engagement (F(9,273) = 8.28, P < 0.0001). The proposed REFLECT system will be of benefit as a complementary anatomy learning tool for students. 相似文献
87.
88.
This article addresses the rhetoric of performance assessment with research on important claims about science performance assessments. We found the following: (a) Concepts and terminology used to refer to performance assessments often were not consistent within and across researchers, educators, and policy-makers. (b) Performance assessments are highly sensitive not only to the tasks and the occasions sampled, but also to the method (e.g., hands-on, computer simulation) used to measure performance. (c) Performance assessments do not necessarily tap higher-order thinking, especially when they are poorly designed. (d) Performance assessments are expensive to develop and use: technology is needed for developing these assessments in an efficient way. (e) Performance assessments do not necessarily have the expected positive impact on teachers' teaching and students' understanding. (f) If teachers are to use performance assessments in their classrooms, they need professional development to help them construct the necessary knowledge and skills. This article attempts to address some of these realities by presenting a conceptual framework that might guide the development and the evaluation of performance assessments, as well as steps that might be taken to create a performance assessment technology and develop teacher inservice programs. © 1996 John Wiley & Sons, Inc. 相似文献
89.
90.