首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   11696篇
  免费   131篇
  国内免费   8篇
教育   8464篇
科学研究   1148篇
各国文化   78篇
体育   870篇
综合类   6篇
文化理论   63篇
信息传播   1206篇
  2021年   114篇
  2020年   158篇
  2019年   214篇
  2018年   343篇
  2017年   327篇
  2016年   321篇
  2015年   202篇
  2014年   361篇
  2013年   2155篇
  2012年   312篇
  2011年   346篇
  2010年   306篇
  2009年   295篇
  2008年   296篇
  2007年   261篇
  2006年   256篇
  2005年   196篇
  2004年   206篇
  2003年   151篇
  2002年   157篇
  2001年   224篇
  2000年   240篇
  1999年   211篇
  1998年   121篇
  1997年   163篇
  1996年   166篇
  1995年   183篇
  1994年   160篇
  1993年   145篇
  1992年   246篇
  1991年   202篇
  1990年   177篇
  1989年   177篇
  1988年   156篇
  1987年   128篇
  1986年   126篇
  1985年   126篇
  1984年   103篇
  1983年   108篇
  1982年   87篇
  1981年   98篇
  1980年   96篇
  1979年   162篇
  1978年   111篇
  1977年   116篇
  1976年   87篇
  1975年   71篇
  1974年   84篇
  1973年   64篇
  1972年   61篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
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   
73.
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   
74.
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   
75.
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   
76.
77.
78.
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   
79.
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   
80.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号