全文获取类型
收费全文 | 36097篇 |
免费 | 426篇 |
国内免费 | 25篇 |
专业分类
教育 | 25129篇 |
科学研究 | 3079篇 |
各国文化 | 398篇 |
体育 | 3599篇 |
综合类 | 28篇 |
文化理论 | 311篇 |
信息传播 | 4004篇 |
出版年
2021年 | 328篇 |
2020年 | 537篇 |
2019年 | 785篇 |
2018年 | 1020篇 |
2017年 | 1039篇 |
2016年 | 967篇 |
2015年 | 605篇 |
2014年 | 801篇 |
2013年 | 6570篇 |
2012年 | 730篇 |
2011年 | 802篇 |
2010年 | 632篇 |
2009年 | 683篇 |
2008年 | 705篇 |
2007年 | 666篇 |
2006年 | 630篇 |
2005年 | 551篇 |
2004年 | 828篇 |
2003年 | 636篇 |
2002年 | 683篇 |
2001年 | 650篇 |
2000年 | 704篇 |
1999年 | 590篇 |
1998年 | 344篇 |
1997年 | 356篇 |
1996年 | 436篇 |
1995年 | 364篇 |
1994年 | 375篇 |
1993年 | 336篇 |
1992年 | 492篇 |
1991年 | 513篇 |
1990年 | 472篇 |
1989年 | 543篇 |
1988年 | 478篇 |
1987年 | 494篇 |
1986年 | 475篇 |
1985年 | 557篇 |
1984年 | 452篇 |
1983年 | 443篇 |
1982年 | 374篇 |
1981年 | 348篇 |
1980年 | 346篇 |
1979年 | 488篇 |
1978年 | 379篇 |
1977年 | 340篇 |
1976年 | 315篇 |
1975年 | 269篇 |
1974年 | 284篇 |
1973年 | 257篇 |
1971年 | 263篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
111.
112.
This paper describes the procedures used at the Library of the College of Physicians of Philadelphia to divide its ninety-year-old dictionary card catalog. The division was necessitated by overcrowding, obsolete subject headings, and lack of a complete authority list which resulted in like materials being scattered throughout the catalog under several headings. Two catalogs were created: the historical-biographical catalog, representing all works published before 1950 and all works of historical or biographical nature; and the current catalog, containing all works published from 1950 on, excepting historical or biographical materials. The 1950- catalog was further divided into name and subject catalogs, and the subject section was revised according to MeSH. The project was completed in about two years. As a result, searching time has been much reduced, and the library is able to take advantage of the annual revisions of MeSH to update the subject catalog. 相似文献
113.
114.
Karyn Ogata Jones Bryan E. Denham Jeffrey K. Springston 《Journal of Applied Communication Research》2006,34(1):94-113
Drawing on components of agenda-setting theory and the two-step flow of information from mass media to news audiences, this study examines the effects of mass and interpersonal communication on breast cancer screening practices among college- and middle-aged women (n = 284). We theorized that screening behaviors among younger women would be influenced more by interpersonal sources of information while screening among middle-aged women would be more influenced by exposure to mass-mediated information. Findings supported anticipated patterns, revealing important and varying roles for both mass and interpersonal communication in the health behaviors of women. Implications for health practitioners and campaign planners, as well as recommendations for future research, are discussed. 相似文献
115.
116.
117.
The views of specialists (academics, librarians, publishers and information scientists) on trends in scholarly communications were canvassed by means of structured questions. A greater commonality of views was found than might have been expected. 相似文献
118.
Jürgen Ebert Franz Lehner Volker Riediger und Andreas Winter 《Informatik - Forschung und Entwicklung》2005,19(3):125-126
Ohne Zusammenfassung 相似文献
119.
OBJECTIVES: Medical Library Association (MLA) members were surveyed to gather background about the current state of expert searching in institutions. The survey results were intended to guide the recommendations of the Task Force on Expert Searching for promoting the importance of expert searching and implementing those recommendations. METHODS: MLA members were surveyed, and data obtained from the survey were compiled and analyzed to answer three general questions: what is the perceived value of searching skills to the institution, how do health sciences librarians maintain and improve their searching skills, and how are searching services promoted and/or mandated in the institution. RESULTS: There were 256 responses to the survey. Over 95% of the respondents saw their expert-searching skills were of value to their institutions, primarily through performing mediated searches and search consultations. Over 83% of the respondents believed that their searching skills had improved over the past 10 years. Most indicated that continued training was very important in maintaining and improving their skills. Respondents promoted searching services most frequently through orientations, brochures, and the libraries' Web pages. No respondent's institution mandated expert searching. Less than 2% of respondents' institutions had best practice guidelines related to expert searching, and only about 8% had guidelines or policies that identified situations where expert searching was recommended. CONCLUSIONS: The survey supports the belief that health sciences librarians still play a valuable role in searching, particularly in answering questions about treatment options and in providing education. It also highlights the need for more expert searching courses. There has been minimal discussion about the perceived need for expert-searching guidelines in the institutions represented by survey respondents. 相似文献
120.
David E. Hubbard Sierra Laddusaw Joel Kitchens Rusty Kimball 《The Journal of Academic Librarianship》2018,44(3):404-411
Academic libraries are increasingly seeking ways to demonstrate their impact on student learning. Acknowledgments - formal statements of indebtedness – in graduate theses and dissertations provide a rather unexplored area for demonstrating impact of the academic library on student learning. This study uses quantitative and qualitative methods to characterize acknowledgments of the Texas A&M University Libraries (TAMU Libraries) in theses and dissertations, both overall and for three disciplines specifically: civil engineering, geography, and history. This study also searched for mentions of the TAMU Libraries throughout the entire body of theses and dissertations. Overall, acknowledgments to the TAMU Libraries in theses and dissertations were less than 1%, though acknowledgments were found in all three disciplines with over a quarter of the history theses and dissertations containing an acknowledgment to libraries. There was no statistically significant difference found between the numbers of acknowledgments in theses versus dissertations. Acknowledgments to the TAMU Libraries were found in the theses and dissertations of 28 different departments. Mentions to the TAMU Libraries – not necessarily a formal acknowledgment – were found throughout the text of theses and dissertations with most concentrated in the acknowledgment, method, and bibliography sections. 相似文献