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   53310篇
  免费   861篇
  国内免费   54篇
教育   38224篇
科学研究   5066篇
各国文化   515篇
体育   3807篇
综合类   57篇
文化理论   555篇
信息传播   6001篇
  2022年   315篇
  2021年   527篇
  2020年   821篇
  2019年   1196篇
  2018年   2050篇
  2017年   2117篇
  2016年   1844篇
  2015年   950篇
  2014年   1390篇
  2013年   9710篇
  2012年   1365篇
  2011年   1571篇
  2010年   1264篇
  2009年   1150篇
  2008年   1301篇
  2007年   1282篇
  2006年   987篇
  2005年   951篇
  2004年   963篇
  2003年   847篇
  2002年   857篇
  2001年   982篇
  2000年   961篇
  1999年   834篇
  1998年   473篇
  1997年   553篇
  1996年   591篇
  1995年   490篇
  1994年   462篇
  1993年   456篇
  1992年   701篇
  1991年   676篇
  1990年   723篇
  1989年   691篇
  1988年   623篇
  1987年   619篇
  1986年   587篇
  1985年   717篇
  1984年   562篇
  1983年   522篇
  1982年   471篇
  1981年   426篇
  1980年   402篇
  1979年   566篇
  1978年   464篇
  1977年   415篇
  1976年   362篇
  1975年   318篇
  1974年   323篇
  1973年   322篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
This article is a preliminary analysis of the first few years of the Computer Matching and Privacy Protection Act of 1988 (CMPPA). The act requires Federal agencies to establish Data Integrity Boards (DIBs) with responsibility to approve written agreements for computer matches in which their agencies are involved. Information for this analysis was collected from the annual reports on computer matching submitted by agencies to the Office of Management and Budget (OMB) for 1990 and 1991 and from 108 matching agreements. The secretaries of several DIBs were also interviewed. The effectiveness of DIBs and matching agreements are analyzed using McCubbins and Schwartz's distinction between “police-patrol” and “fire- alarm” oversight. The article concludes that more active and direct oversight, which would occur through an independent data protection or privacy board, is necessary.  相似文献   
102.
103.
104.
105.
The validity and reliability of curriculum‐based measures in reading as indicators of performance and progress for secondary‐school students were examined. Thirty‐five grade 8 students completed reading aloud and maze‐selection measures weekly for 10 weeks. Criterion measures were the state standards test in reading and the Woodcock–Johnson III Test of Achievement. Different time frames for each measure were compared. Most alternate‐form reliability coefficients were above .80. Criterion‐related validity coefficients ranged from .77 to .89. No differences related to time were found. Only maze selection reflected significant growth, with an average increase of 1.29 correct choices per week. Maze growth was related to the reading performance level and to change on the Woodcock–Johnson III from pre‐ to posttest.  相似文献   
106.
S. Ramasesha 《Resonance》2009,14(8):782-798
Efficient lighting and display have become important concerns in the energy-starved modern world. This has led to new paradigms in lighting and display technologies. Organic molecules provide a new class of active materials for such technologies. This article gives the basic science behind the design of such molecular materials used in displays and lighting.  相似文献   
107.
108.
109.
The most frequently requested accommodation among students with learning disabilities (LD) in postsecondary settings is extended test time. The frequency with which this accommodation is requested and granted compels disability service providers to become knowledgeable about the factors that influence the need for, and appropriateness of, the accommodation. Moreover, the synthesis of these factors becomes the basis for determining if the accommodation is reasonable under federal law. The purpose of this article is to present a step‐by‐step model to be used as a decision‐making process when considering the accommodation of extended test time for postsecondary students with LD. The model is designed to assist disability service providers in the analysis and synthesis of information collected from (1) the student's diagnostic evaluation, (2) the course or classroom test to be accommodated, and (3) student interviews. A list of diagnostic tests from the four most frequently administered test batteries used with adults is provided, along with a concise explanation of how characteristics of LD impact reading, writing, and math, and relate to the need for extended time. This information can be used to determine if extended test time is a reasonable accommodation and to estimate how much additional time to provide.  相似文献   
110.
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