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   2808篇
  免费   52篇
  国内免费   2篇
教育   2250篇
科学研究   79篇
各国文化   39篇
体育   108篇
文化理论   13篇
信息传播   373篇
  2022年   9篇
  2021年   20篇
  2020年   39篇
  2019年   62篇
  2018年   80篇
  2017年   100篇
  2016年   81篇
  2015年   65篇
  2014年   65篇
  2013年   737篇
  2012年   66篇
  2011年   91篇
  2010年   72篇
  2009年   73篇
  2008年   80篇
  2007年   79篇
  2006年   72篇
  2005年   64篇
  2004年   63篇
  2003年   55篇
  2002年   61篇
  2001年   47篇
  2000年   48篇
  1999年   37篇
  1998年   33篇
  1997年   52篇
  1996年   33篇
  1995年   37篇
  1994年   35篇
  1993年   31篇
  1992年   32篇
  1991年   28篇
  1990年   23篇
  1989年   24篇
  1988年   22篇
  1987年   13篇
  1986年   27篇
  1985年   27篇
  1984年   22篇
  1983年   23篇
  1982年   20篇
  1981年   14篇
  1980年   23篇
  1979年   22篇
  1978年   23篇
  1977年   19篇
  1976年   16篇
  1973年   9篇
  1970年   8篇
  1969年   9篇
排序方式: 共有2862条查询结果,搜索用时 15 毫秒
171.
Publishing companies have embraced strategic, business, and market planning, but may not fully grasp its potential. This article describes their applications in a publishing environment, focusing on fundamental information required if the process is to have a beneficial outcome, as well as risks for the organization if planning is poorly conceived. This article is adapted from a presentation at a marketing and fulfillment seminar sponsored by the Society for Scholarly Publishing, April 21, 1988.  相似文献   
172.
This article, which examines variables affecting scores on a test of library skills, finds that the frequency with which students receive assignments requiring library research is the best predictor of a score. The unevenness is students' research skills has implications for bibliographic instruction.  相似文献   
173.
The study examines selected roles of the information sector in the national economy. Among the findings are the following: (1) the information sector conducts relatively little international trade, in comparison to its domestic activity. Roughly 12% of U.S. exports are attributable to the information sector; over 97% of the sector's output is sold within the U.S.; and the sector's exports account for only a small fraction of 1% of GNP. (2) The historical pattern of employment shows that the portion of information workers has risen from 8% of the U.S. work force in 1870 to 41% in 1970. Relatively little of this growth is the result of new technological innovations such as telephones, radio, television and, more recently, computers. Rather, the growth of public and private bureaucracies, which now total 26% of our total work force, largely explains the growth of the sector. (3) Unemployment within the information sector has consistently been lower than in either the manufacturing or agricultural sectors of the national economy. (4) Since 1967, the high technology elements of the information sector, such as electronic components, computers and telecommunications equipment have experienced appreciably less price rise than has the economy as a whole. However, over the same time period, the service elements of the sector, including finance and insurance, education and medical care, have experienced greater rates of inflation than has the economy as a whole.  相似文献   
174.
175.
176.
To facilitate the adoption of a common core curriculum in the Schools of Engineering and of Mining at the University of Arizona, the general physics course for engineers has been dropped. The physical foundation for engineering is taught in a new series of courses in the Civil, Mechanical, Electrical Engineering, and Physics Departments as part of the common core. The Physics Department teaches atomic, molecular, nuclear, and solid-state physics in a seven-unit junior-level course. There are grounds for a re-examination of the role of physics in engineering education and perhaps for extensive changes. It is suggested, however, that the role is, and should remain, vital, in the interests of science, of engineering, and of education.  相似文献   
177.
178.
In this hyper-competitive era, patents are an essential input to realizing sustainable competitive advantage. However, individual differences exist in patenting filing behavior and behaviors related to commercialization of patents. This study explores these behaviors in the context of three demographic variables. The demographic variables are patenting and commercialization experiences of inventors, age and sector. Further, aspirations of these inventors are assessed using external motivators of wealth, fame, and concern for societal welfare, and internal motivators such as pragmatism. The findings of this empirical study (n = 116) suggest that sector and age determine differences in personal internal motivators more than patent commercialization experience. Implications of the study are discussed.  相似文献   
179.
To examine the development of look duration as a function of age and stimulus type, 14- to 52-week-old infants were shown static and dynamic versions of faces, Sesame Street material, and achromatic patterns for 20 s of accumulated looking. Heart rate was recorded during looking and parsed into stimulus orienting, sustained attention, and attention termination phases. Infants' peak look durations indicated that prior to 26 weeks there was a linear decrease with age for all stimuli. Older infants' look durations continued to decline for patterns but increased for Sesame Street and faces. Measures of heart rate change during sustained attention and the proportion of time spent in each phase of attention confirmed infants' greater engagement with the more complex stimuli.  相似文献   
180.
A lack of demographic information and data related to the achievement of short-term goals during substance abuse treatment among persons who are deaf or hard of hearing dictated the need for the study. New York State maintains a database on all individuals who participate in treatment. Within this database, 1.8% of persons in treatment for substance use disorder (SUD) were also deaf or hard of hearing. As hypothesized, members of the deaf and hard of hearing sample were older, likelier to be white, and likelier to be female, relative to the SUD-only group. For both groups, alcohol, heroin, and cocaine had the highest rates of reported use. Achievement of short-term goals in the areas of alcohol use, drug use, vocational/educational goals, and overall goals indicated no differences between the deaf and hard of hearing group and the SUD-only group. Implications of these findings are discussed.  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