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   17680篇
  免费   277篇
  国内免费   31篇
教育   12194篇
科学研究   2191篇
各国文化   142篇
体育   1308篇
综合类   20篇
文化理论   188篇
信息传播   1945篇
  2022年   118篇
  2021年   181篇
  2020年   284篇
  2019年   376篇
  2018年   531篇
  2017年   589篇
  2016年   514篇
  2015年   356篇
  2014年   516篇
  2013年   2890篇
  2012年   434篇
  2011年   426篇
  2010年   399篇
  2009年   349篇
  2008年   381篇
  2007年   407篇
  2006年   357篇
  2005年   295篇
  2004年   318篇
  2003年   286篇
  2002年   287篇
  2001年   391篇
  2000年   444篇
  1999年   322篇
  1998年   203篇
  1997年   235篇
  1996年   234篇
  1995年   156篇
  1994年   170篇
  1993年   142篇
  1992年   263篇
  1991年   243篇
  1990年   262篇
  1989年   257篇
  1988年   244篇
  1987年   239篇
  1986年   237篇
  1985年   270篇
  1984年   199篇
  1983年   197篇
  1982年   170篇
  1981年   147篇
  1980年   138篇
  1979年   216篇
  1978年   175篇
  1977年   145篇
  1976年   126篇
  1975年   124篇
  1974年   124篇
  1973年   120篇
排序方式: 共有10000条查询结果,搜索用时 602 毫秒
61.
Adequate research in the peripheral field of medical geography requires familiarity with the literature of medicine, geography, and other environmentally oriented fields. The pertinent literature of the two primary disciplines, as well as that of anthropology, nutrition, and human bioclimatology, is surveyed from a bibliographical point of view. A brief review of historical sources is presented, followed by a discussion of the contemporary organizations, both international and national, active in the field. Emphasis is placed on the publishing programs and projects, maps, atlases, symposia, reports, and other literature sponsored or stimulated by these organizations. Regional bibliographical surveys for East Africa, India, and the Soviet Union are also noted. Pertinent aspects of bibliographies, indexes, abstracts, library card catalogs and accession lists, and other resources are listed, with emphasis on the various subject headings and other approaches to them. Throughout, the sources of information are approached from a multidisciplinary and interdisciplinary viewpoint.  相似文献   
62.
63.
Serials, one of the more complicated areas of library technical endeavors, has lacked the benefit of standards for a long time. Even now, with standards beginning to be available, the majority of institutions are not working within standard serials formats. A survey to determine the use of serials standards in libraries was conducted in 1988 by the American Library Association, Resources and Technical Services Division, Serials Section, Committee to Study Serials Standards. In the spring of 1988 a survey was sent to a group encompassing the Association of Research Libraries members, CONSER participants, United States Newspaper Program participants, Microform Project libraries, and some vendors and librarians who attended the Committee meetings on a regular basis. The survey questionnaire assessed the current level of serials standards awareness of librarians and vendors. Topics included the type of serials systems used, standards relevant to serials control and union listing and whether or not they are implemented, types and levels of training staff received in the application of standards, benefits of the standards, and areas where standards are most needed.  相似文献   
64.
65.
66.
67.
68.
This paper discusses the evaluation of scientific activity with the help of some scientometric indices, in particular, a citation index. The information massif of the bibliographic database of citations to domestic publications of Kazakh authors is statistically described.  相似文献   
69.
The publication activity of Russian and Belarussian scientists, the degree of reflection of their papers in Scopus databases, and the data on the citation of Belarussian authors in the works of other researchers are discussed.  相似文献   
70.
We consider some issues of the development of the national information infrastructure in the field of innovation, including a national system of accounting for the results of scientific and technical activities (RSTA) and a national new-generation research computer network (NNGRCN). The current state of the national system of scientific and technical information and its resources for information support of innovation processes are analyzed. In the context of further development of the Commonwealth of Independent States (CIS), we propose a Conception of scientific and technical support for programs and projects of NIS member-states in the field of innovation, making it possible to incorporate the existing innovation-oriented information resources into a joint distributed integrated information system as well as to create new information resources and technologies.  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