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   3817篇
  免费   23篇
  国内免费   89篇
教育   2244篇
科学研究   507篇
各国文化   6篇
体育   677篇
综合类   40篇
文化理论   7篇
信息传播   448篇
  2024年   11篇
  2023年   26篇
  2022年   32篇
  2021年   27篇
  2020年   33篇
  2019年   21篇
  2018年   32篇
  2017年   10篇
  2016年   22篇
  2015年   43篇
  2014年   131篇
  2013年   92篇
  2012年   253篇
  2011年   352篇
  2010年   155篇
  2009年   109篇
  2008年   228篇
  2007年   214篇
  2006年   257篇
  2005年   207篇
  2004年   200篇
  2003年   161篇
  2002年   162篇
  2001年   126篇
  2000年   118篇
  1999年   112篇
  1998年   39篇
  1997年   44篇
  1996年   25篇
  1995年   33篇
  1994年   34篇
  1993年   39篇
  1992年   44篇
  1991年   47篇
  1990年   36篇
  1989年   58篇
  1988年   20篇
  1987年   35篇
  1986年   40篇
  1985年   39篇
  1984年   20篇
  1983年   22篇
  1982年   33篇
  1981年   23篇
  1959年   12篇
  1958年   11篇
  1957年   11篇
  1956年   11篇
  1954年   11篇
  1953年   9篇
排序方式: 共有3929条查询结果,搜索用时 421 毫秒
91.
92.
93.
Podcasts offer a way for medical professionals to listen to current information in medicine from an iPod, MP3 player, handheld device, or computer. As podcasts become more popular, libraries may be interested in integrating programs into the library collection. South Pointe Medical Library evaluated medical podcasts relevant to the scope of the library collection and explored methods for finding and organizing such programs in ways that are efficient for both the librarian and the patron. doi:10.1300/J115v26n01_03.  相似文献   
94.
Objectives: To explore how the library service expectations and perceptions of users might differ across health‐related libraries as against major research libraries not operating in a medical context; to determine whether users of medical libraries demand better library service quality, because the inability of users to access needed literature promptly may lead to a patient who cannot be properly diagnosed, or a diagnosis that cannot be properly treated. Methodology: We compared LibQUAL+® total and subscale scores across three groups of US, Canadian and British libraries for this purpose. Results: Anticipated differences in expectations for health as other library settings did not emerge. Conclusions: The expectations and perceptions are similar across different types of health science library settings, hospital and academic, and across other general research libraries.  相似文献   
95.
96.
In this article we address "language approach" data as a key variable in quantitative, large-scale research on educational achievement, focusing on our work for the Achievements of Deaf Pupils in Scotland (ADPS) project. The complexity of approaches is addressed, with a particular focus on a "no-exclusion" model of service. In this context 3 years of language-related data are discussed, using constructions of language variables that take into account the variability in deaf pupils' hearing loss levels, types of provision, and professional practice. We see this as a necessary first step toward offering a nuanced context for understanding patterns in the educational outcomes among the ADPS population to be reported in a later article. The ADPS data on language approach can reveal general patterns at macro levels: our analysis suggests that, in Scotland, the extent and quality of British Sign Language/English provision may be determined more by local factors than by linguistic requirements and that ostensibly responsive policies can mask a limited spectrum for pupils and their families. However, the ADPS data are insufficiently sensitive to detailed and local variations to reflect the full complexity of language situations over time-a situation which represents an ongoing challenge for all long-term, large-scale studies.  相似文献   
97.
98.
This study assessed perception of suprasegmental features of speech by 30 prelingual children with sensorineural hearing loss. Ten children had cochlear implants (CIs), and 20 children wore hearing aids (HA): 10 with severe hearing loss and 10 with profound hearing loss. Perception of intonation, syllable stress, word emphasis, and word pattern was assessed. Results revealed that the two HA groups significantly outperformed the CI group in perceiving both intonation and stress. Within each group, word pattern was perceived best, and then intonation and emphasis, with syllable stress perceived poorest. No significant correlation emerged between age at implantation and perception of the various suprasegmental features, possibly due to participants' relatively late age at implantation. Results indicated that CI use did not show an advantage over HA use in the perception of suprasegmental features of speech. Future research should continue to explore variables that might improve this perception.  相似文献   
99.
生民之幸     
中国特色社会主义事业总体布局由经济建设、政治建设、文化建设"三位一体"拓展为包括社会建设在内的"四位一体",是胡锦涛总书记"十七大"报告的一个新提法.而优先发展教育,建设人力资源强国,成为改善民生为重点的社会建设的首要内容,这让我们深切地感受到"发展中国特色社会主义"新理念有着实实在在的社会现实基础.把教育事业与民生发展联系起来,无论在理论上还是在实践上,都有着十分重要的意义,其丰富的内涵值得我们去深思、去体味.  相似文献   
100.
Objective: To study the effect of halo substitution on disubstituted aryl semicarbazones on the anticonvulsant potential and model the activity based on quantum mechanics. Methods: A series of twenty-six compounds of N^4-(4-bromo-3-methylphenyl) semicarbazones were synthesized and evaluated for the anticonvulsant activity in the maximal electroshock seizure (MES) and subcutaneous pentylenetetrazole (scPTZ) seizure threshold tests. Some potential compounds were also tested in the subcutaneous strychnine (scSTY) and subcutaneous picrotoxin (scPIC) seizure threshold tests. The synthesized compounds were tested for behavioral impairment and CNS (central nervous system) depression in mice. Quantum mechanical modelling was carried out on these compounds to gain understanding on the structural features essential for activity. Results: Some compounds possessed broad spectrum anticonvulsant activity as indicated by their effect in pentylenetetrazole, strychnine, picrotoxin and maximal electroshock seizures models in resemblance to other aryl semicarbazone derivatives reported earlier. The higher the difference in HOMO (highest occupied molecular orbital) and LUMO (lowest unoccupied molecular orbital) energy levels was, the greater was the activity profile. Conclusion: The pharmacophoric requirements for compounds to exhibit anticonvulsant activity that includes one aryl unit in proximity to a hydrogen donor-acceptor domain and an electron donor have been justified with the molecular orbital surface analysis of the synthesized compounds.  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