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   4491篇
  免费   95篇
  国内免费   133篇
教育   2484篇
科学研究   821篇
各国文化   47篇
体育   318篇
综合类   205篇
文化理论   40篇
信息传播   804篇
  2024年   2篇
  2023年   6篇
  2022年   57篇
  2021年   142篇
  2020年   96篇
  2019年   60篇
  2018年   65篇
  2017年   65篇
  2016年   59篇
  2015年   136篇
  2014年   185篇
  2013年   294篇
  2012年   337篇
  2011年   338篇
  2010年   323篇
  2009年   289篇
  2008年   293篇
  2007年   333篇
  2006年   344篇
  2005年   265篇
  2004年   141篇
  2003年   124篇
  2002年   130篇
  2001年   128篇
  2000年   109篇
  1999年   79篇
  1998年   55篇
  1997年   64篇
  1996年   59篇
  1995年   37篇
  1994年   22篇
  1993年   21篇
  1992年   17篇
  1991年   5篇
  1990年   5篇
  1989年   15篇
  1988年   6篇
  1987年   1篇
  1986年   3篇
  1985年   1篇
  1984年   3篇
  1983年   1篇
  1979年   1篇
  1975年   1篇
  1957年   1篇
  1946年   1篇
排序方式: 共有4719条查询结果,搜索用时 15 毫秒
861.
社区教育教师是一个非常特殊的教育群体,拥有特殊的工作特性和工作能力。关键事件对于个体发展有着非常重要的作用,生活中到处充满着关键事件的不同形态,社区教育教师应当拥有娴熟处理关键事件的能力,着重帮助社区教育教师探究如何利用关键事件的契机,实现自我成长与发展。  相似文献   
862.
Objective:Gorham-Stout syndrome (GSS) is a rare disorder of uncertain etiology and unpredictable prognosis. This study aims to present a comprehensive understanding of this rare entity. Methods:A literature search in PubMed and three Chinese databases was performed to screen histologically proven GSS cases among Chinese residents in the mainland. We analyzed the patients’ clinical characteristics, the value of different treatment modalities and their influence on the clinical outcome. Results:Sixty-seven cases were finally enrolled. There were 43 men (64.2%) and 24 women (35.8%). The mean age at diagnosis was 28 years (1.5-71 years). The most common clinical symptoms included pain (n=40, 59.7%), functional impairment (n=13, 19.4%), and swelling (n=12, 17.9%). The radiographic presentation of 37 cases (55.2%) was disappearance of a portion of the bone. The others presented as radiolucent foci in the intramedullary or subcortical regions. A total of 42 cases provided data on therapy, these included surgery (n=27, 40.3%), radiation therapy (n=6, 9.0%), surgery combined with radiation therapy (n=2, 3.0%), and medicine therapy (n=7, 10.4%). For 30 of these 42 cases, follow-up data were available:21 cases had the disorder locally controlled and 9 had a symptom progression. Fortunately, the disease is not fatal in the majority of cases. Conclusions:GSS has no specific symptoms and it should be taken into consideration when an unclear massive osteolysis occurs. The efficacies of different treatment modalities are still unpredictable and further research is required to assess the values of different treatments.  相似文献   
863.
借鉴韦伯模式对浙江省金华市某省级重点中学2012年度第二学期高中一年级地理学科期中试卷进行一致性分析,发现当前校内考试主要存在以下问题:教师课程标准的意识不强;校内考试重视知识和技能、轻视方法和情感态度价值观;校内考试追求最高标准的达成等。应采取增强教师的课程标准意识、提高教师"基于标准"的命题水平、建立校内考试与课程标准一致性评价制度、修订和完善现行课程标准等措施加以解决。  相似文献   
864.
We studied the allelic frequency distributions and statistical forensic parameters of 21 new short tandem repeat (STR) loci and the amelogenin locus, which are not included in the combined DNA index system (CODIS), in a Russian ethnic minority group from the Inner Mongolia Autonomous Region, China. A total of 114 bloodstain samples from unrelated individuals were extracted and co-amplified with four fluorescence-labeled primers in a multiplex polymerase chain reaction (PCR) system. Using capillary electrophoresis, the PCR products of the 21 STR loci were separated and genotyped. A total of 161 alleles were observed in the Russian ethnic minority group, and corresponding allelic frequencies ranged from 0.0044 to 0.5965. The 21 non-CODIS STR loci of the Russian ethnic minority group were characterized by high genetic diversity and therefore may be useful for elucidating the population’s genetic background, for individual identification, and for paternity testing in forensic practice.  相似文献   
865.
微博作为一种新兴传播手段,在提高图书馆与读者双方交流便利性的同时,其碎片化传播、情绪主导表达、围观性及管理缺失的特点,也容易催化不良信息的产生和传播,图书馆可以在危机信息传播的潜在期进行安全预警,规避防范危机信息的产生;发生期认真对待,及时有效化解危机;解决恢复期加强舆论引导,分散危机信息.参考文献10.  相似文献   
866.
文章分析了高校图书馆联盟建设中存在的一系列问题,针对这些存在的问题提出了高校图书馆联盟建设的策略。  相似文献   
867.
Prior research has indicated that exposure to negative political advertising can foster among individuals feelings of alienation, distrust, and apathy toward government or the political process. However, investigation regarding the amount of exposure to such advertising and the form in which it is presented remains scant. This experimental study examined the impact of ad type (character based vs. issue based) and amount of advertising exposures on individuals' cynicism and perceived self-efficacy in relation to the government. Results indicated that issue-based attack ads aired during the 2004 presidential election led to greater cynicism and lower self-efficacy than did character-based attack ads. A significant interaction revealed that the difference on the self-efficacy measure was greatest at the highest exposure level, indicating that continual exposure to ads dealing with governmental policies may nurture the perception that the political process is overly complex, which subsequently can decrease individuals' beliefs that they can make a difference.  相似文献   
868.
Research has examined the relationship between traditional news media use and normatively important political outcomes such as knowledge and participation. However, most research fails to account for variations in the nature of news over time and across communities that could alter the fundamental relationship between exposure and these outcomes. Here two studies are presented—one with variation in news characteristics over time based on the American National Election Studies time series data and another with variation across local communities and newspapers within a single state during a single election year—to assess the hypothesis that the relationship between news use and political outcomes are moderated by natural variations in the nature of the news content and news outlets.  相似文献   
869.
指出在网络受控环境下,用户主观因素是影响信息检索绩效的重要变量,在信息检索过程中发挥着至关重要的作用。利用CCA典型相关分析方法,分析主观因素与检索行为等因素之间的关系。结果表明:①容易度与任务总时间显著相关,当用户在检索后判断任务难度大时将会付出更多的时间和努力;②标记文献数、重复浏览率、浏览网页数与感觉、丢失度相关;③高兴度与相关度、完成度负相关表明用户在检索前愉悦程度低的用户可能获得更好的检索结果。  相似文献   
870.
面向LOD的关联发现过程的定位、目标与复杂性分析   总被引:1,自引:1,他引:0  
本文以关联数据应用过程中的关联发现过程为研究对象,分析了面向关联开放数据(LOD)的关联发现过程的定位、目标与复杂性。本文认为,关联发现过程处于关联数据应用过程三阶段(数据发布、数据互联与数据消费)中的第二阶段。关联发现过程的整体目标是构建多类资源之间的关联数据网络,该过程的本质就是关联数据网络不断演变的过程。关联发现的过程具有多任务、多路径、多步骤等复杂性特征。目前流行的关联发现框架还存在缺乏对整个网络演变过程的支持、任务类型单一、缺乏流水线机制等不足。因此,关联发现技术的研究急需新的面向整个关联数据网络的、支持完整演变过程的、支持多任务集成的理论、方法与框架。图5。表1。参考文献17。  相似文献   
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