全文获取类型
收费全文 | 9156篇 |
免费 | 111篇 |
国内免费 | 8篇 |
专业分类
教育 | 6321篇 |
科学研究 | 1133篇 |
各国文化 | 59篇 |
体育 | 640篇 |
综合类 | 3篇 |
文化理论 | 58篇 |
信息传播 | 1061篇 |
出版年
2022年 | 59篇 |
2021年 | 107篇 |
2020年 | 147篇 |
2019年 | 201篇 |
2018年 | 316篇 |
2017年 | 304篇 |
2016年 | 284篇 |
2015年 | 174篇 |
2014年 | 288篇 |
2013年 | 1538篇 |
2012年 | 217篇 |
2011年 | 256篇 |
2010年 | 217篇 |
2009年 | 195篇 |
2008年 | 244篇 |
2007年 | 206篇 |
2006年 | 181篇 |
2005年 | 161篇 |
2004年 | 189篇 |
2003年 | 144篇 |
2002年 | 142篇 |
2001年 | 200篇 |
2000年 | 210篇 |
1999年 | 190篇 |
1998年 | 98篇 |
1997年 | 132篇 |
1996年 | 113篇 |
1995年 | 83篇 |
1994年 | 100篇 |
1993年 | 71篇 |
1992年 | 166篇 |
1991年 | 132篇 |
1990年 | 122篇 |
1989年 | 152篇 |
1988年 | 135篇 |
1987年 | 108篇 |
1986年 | 108篇 |
1985年 | 118篇 |
1984年 | 86篇 |
1983年 | 96篇 |
1982年 | 61篇 |
1981年 | 77篇 |
1980年 | 66篇 |
1979年 | 107篇 |
1978年 | 71篇 |
1977年 | 67篇 |
1976年 | 61篇 |
1975年 | 52篇 |
1974年 | 63篇 |
1973年 | 58篇 |
排序方式: 共有9275条查询结果,搜索用时 15 毫秒
61.
Karla K. McGregor Natalie Langenfeld Sam Van Horne Jacob Oleson Matthew Anson Wayne Jacobson 《Learning disabilities research & practice》2016,31(2):90-102
To explore the university experiences of students with learning disabilities (LD), 63,802 responses to the 2014 Student Experience in the Research University Survey were analyzed. Compared to other students, those with self‐reported LD (5.96 percent) had difficulty with assignments and had more obstacles caused by nonacademic responsibilities and imposed by their skill levels. Students with self‐reported LD sensed more bias toward people with disabilities on campus, and they were less satisfied with their overall experience. Interactions between disability status and age suggested even more challenges for older students who self‐reported LD. Approximately one‐third of students who self‐reported LD received accommodations. The rate of accommodations was higher among individuals who were wealthy, who lived alone, and who were out‐of‐state students. Compared to students who self‐reported LD but reported no accommodations, those with accommodations had more contact with faculty and less difficulty with assignments. 相似文献
62.
Danny Bavli Elishai Ezra Daniel Kitsberg Margarita Vosk-Artzi Shashi K. Murthy Yaakov Nahmias 《Biomicrofluidics》2016,10(2)
Cell-cell interactions play a key role in regeneration, differentiation, and basic tissue function taking place under physiological shear forces. However, current solutions to mimic such interactions by micro-patterning cells within microfluidic devices have low resolution, high fabrication complexity, and are limited to one or two cell types. Here, we present a microfluidic platform capable of laminar patterning of any biotin-labeled peptide using streptavidin-based surface chemistry. The design permits the generation of arbitrary cell patterns from heterogeneous mixtures in microfluidic devices. We demonstrate the robust co-patterning of α-CD24, α-ASGPR-1, and α-Tie2 antibodies for rapid isolation and co-patterning of mixtures of hepatocytes and endothelial cells. In addition to one-step isolation and patterning, our design permits step-wise patterning of multiple cell types and empty spaces to create complex cellular geometries in vitro. In conclusion, we developed a microfluidic device that permits the generation of perfusable tissue-like patterns in microfluidic devices by directly injecting complex cell mixtures such as differentiated stem cells or tissue digests with minimal sample preparation. 相似文献
63.
K. S. Yakovlev D. A. Makarov E. S. Baskin 《Scientific and Technical Information Processing》2015,42(5):347-358
In the article we solve path planning task for an agent being multirotor unmanned aerial vehicle (multicopter). We propose an approach of estimating path geometry constraints based on UAV flight dynamics model and control constraints. Than we introduce a new path finding method which takes into consideration those geometry constraints and study this method both theoretically and empirically. 相似文献
64.
65.
K.A. Cherevyk 《Russian Education & Society》2016,58(12):779-788
This article analyzes the situation surrounding the education of the disabled in Kyrgyzstan. We provide a detailed discussion of the national legal and regulatory framework that guarantees the rights of persons with disabilities to education. We describe the actual situation in the country concerning access to education for this section of the population as well as other factors that impact it. 相似文献
66.
67.
68.
Educational Psychology Review - In his 1973 article The Structure of ill structured problems, Herbert Simon proposed that solving ill-structured problems could be modeled within the same... 相似文献
69.
Christina Hamme Peterson Sean B. Hall Juleen K. Buser 《Counselor Education & Supervision》2016,55(2):80-94
Counselors (N = 911) reported the research skills needed for practice and subsequent research training needs. Findings indicate that counselors have a high need for research skills at work, but training needs differ significantly by counselor type. Recommendations include increasing emphasis on single‐case design, survey design, and widely available data analysis tools. 相似文献
70.