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   22716篇
  免费   372篇
  国内免费   30篇
教育   16394篇
科学研究   1986篇
各国文化   203篇
体育   1721篇
综合类   34篇
文化理论   189篇
信息传播   2591篇
  2022年   136篇
  2021年   234篇
  2020年   374篇
  2019年   507篇
  2018年   708篇
  2017年   792篇
  2016年   734篇
  2015年   437篇
  2014年   593篇
  2013年   4277篇
  2012年   573篇
  2011年   637篇
  2010年   489篇
  2009年   462篇
  2008年   530篇
  2007年   502篇
  2006年   449篇
  2005年   393篇
  2004年   370篇
  2003年   336篇
  2002年   385篇
  2001年   425篇
  2000年   396篇
  1999年   404篇
  1998年   210篇
  1997年   232篇
  1996年   256篇
  1995年   213篇
  1994年   210篇
  1993年   193篇
  1992年   302篇
  1991年   300篇
  1990年   330篇
  1989年   311篇
  1988年   295篇
  1987年   248篇
  1986年   256篇
  1985年   323篇
  1984年   266篇
  1983年   255篇
  1982年   196篇
  1981年   206篇
  1980年   176篇
  1979年   240篇
  1978年   214篇
  1977年   194篇
  1976年   160篇
  1975年   128篇
  1974年   120篇
  1973年   147篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
This study highlights the unique accommodations integral to welcoming transgender library patrons. Research shows transgender people have unique needs which differ from lesbian, gay, bisexual, and queer (LGBQ) individuals, and experience substantial barriers to obtaining quality library service. Most studies in the past exploring the needs of lesbian, gay, bisexual, and transgender library users focused exclusively on LGBQ users. This study surveyed adult transgender individuals (n = 102) with an online questionnaire. The majority of participants were white, designated female at birth, and under 40 years old. Survey respondents needed libraries to make accommodations for them to feel safe (p < 0.001). The top 5 accommodations needed were recent transgender literature, gender identity or expression as part of library nondiscrimination policy, gender neutral, single-stall bathrooms where a key did not need to be requested, recent LGBQ literature), and an established remote process for name change.  相似文献   
992.
INTRODUCTION In cancer patients, tumor immunity is generally impaired. However, tumor immunity may occur in-vivo as circulating tumor-specific antibodies, with cytotoxic T lymphocytes (CTLs) having been identi- fied in cancer patients (Disis et al., 1997; Albert et al., 1998) suggesting that effective anti-tumor responses may be elicited through immunotherapeutic strategies. In recent years, a number of clinical trials have proved the safety and feasibility of using human dendritic cell…  相似文献   
993.
Females generally attend more to social information than males; however, little is known about the early development of these sex differences. With eye tracking, 2-month olds’ (N = 101; 44 females) social orienting to faces was measured within four-item image arrays. Infants were more likely to detect human faces compared to objects, suggesting a functional face detection system. Unexpectedly, males looked longer at human faces than females, and only males looked faster and longer at human faces compared to objects. Females, in contrast, looked less at human faces relative to animal faces and objects, appearing socially disinterested. Notably, this is the first report of a male face detection advantage at any age. These findings suggest a unique stage in early infant social development.  相似文献   
994.
The purpose of this study was to explore the relationships among cognitive processing, phonological processing and basic reading skill performance. Cognitive theorists propose that Planning, Attention, Simultaneous and Successive (PASS) processes are related to various phonological skills. A sample of 62 Primary Grade children referred for reading problems were administered measures of cognitive processes (Cognitive Assessment System), phonological processes (Comprehensive Test of Phonological Processing) and basic reading achievement (Woodcock‐Johnson Tests of Academic Achievement‐III). Findings indicated that some cognitive processes were significantly related to phonological processes as well as basic reading skills. The strongest relationships were found between phonological memory and successive processes and between phonological awareness and basic reading performance.  相似文献   
995.
Reflective-thinking skills are important in problem-based learning environments as they help learners become deeply engaged in learning. The literature suggests several instructional-design factors (e.g., environment, teaching methods, scaffolding tools) that may prompt reflection in learners. However, it is unclear whether these factors differ based on age or developmental stage. The results of this study indicate that middle-school students perceive the learning environment factor as more important to prompting their thinking, while college students perceive the scaffolding methods factor as more important. While the elements clustered into two factors, most college students disagreed with their helpfulness in prompting reflective thinking, a finding opposite to that obtained for middle-school students. Different patterns were also found between learners’ perceptions of the most helpful elements within each factor. Based on these results, suggestions are given for designing developmentally and age-appropriate PBL learning environments that support reflective thinking.  相似文献   
996.
Current initiatives designed to develop stronger international co-operation between guidance services within the European Community are outlined. The implications of extending the Community to cover other European countries are discussed. The issue is raised of whether a common European approach to guidance is likely to emerge, and whether it is likely to differ from American approaches. Adapted and updated version of a paper presented at the International Conference of the International Association for Educational and Vocational Guidance held at the University of Lisbon, Portugal, on 9–13 September 1991.  相似文献   
997.
Regulation     
Bill F. Chamberlin and Charlene J. Brown, eds., THE FIRST AMENDMENT RECONSIDERED: NEW PERSPECTIVES ON THE MEANING OF FREEDOM OF SPEECH. AND PRESS (New York: Longman, 1982---$27.95)

Marc A. Franklin, CASES AND MATERIALS ON MASS MEDIA LAW (Mineola, N.Y.: The Foundation Press, 1982---$26.00)

LEGAL AND BUSINESS ASPECTS OF THE ADVERTISING INDUSTRY 1982 (Practicing Law Institute, 810 7th Avenue, New York, N.Y. 10019---$30.00, paper)

PRIVACY (Social Issues Resources Inc., P.O. Box 2507, Boca Raton, Fla. 33432---two loose-leaf volumes containing a total of 180 articles, $117.00, also available separtately at $65.00 and $52.00 respectively)  相似文献   
998.
999.
1000.
Two squirrel monkeys searched for a reward buried in 1 of 144 holes that formed a 12×12 grid (48×50 cm). An array of vertical, colored landmarks was placed on the grid, and their locations on the grid were changed from trial to trial. During training trials, the mealworm reward was placed either in the center of a square array of landmarks (Experiments 1 and 3) or midway between two landmarks (Experiment 2). On nonrewarded test trials, the monkeys searched among landmarks placed in the same arrays as those used in training and among landmarks placed in an expanded array (Experiments 1 and 2) or in an array intermediate between the two arrays used in training (Experiment 3). Distributions of searches on test trials indicated that the monkeys searched mostly within the configuration of the landmarks but that they had not coded the location of the reward as being either in the middle of the landmarks or at a fixed distance and direction from an individual landmark.  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