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   124714篇
  免费   1621篇
  国内免费   234篇
教育   86499篇
科学研究   13518篇
各国文化   1995篇
体育   9678篇
综合类   171篇
文化理论   1062篇
信息传播   13646篇
  2021年   958篇
  2020年   1670篇
  2019年   2585篇
  2018年   3157篇
  2017年   3399篇
  2016年   3433篇
  2015年   2320篇
  2014年   3184篇
  2013年   27278篇
  2012年   2447篇
  2011年   2835篇
  2010年   2365篇
  2009年   2615篇
  2008年   2428篇
  2007年   2176篇
  2006年   2393篇
  2005年   2387篇
  2004年   3066篇
  2003年   2371篇
  2002年   2185篇
  2001年   2127篇
  2000年   1761篇
  1999年   1631篇
  1998年   1461篇
  1997年   1525篇
  1996年   1694篇
  1995年   1468篇
  1994年   1463篇
  1993年   1466篇
  1992年   1547篇
  1991年   1455篇
  1990年   1435篇
  1989年   1380篇
  1988年   1235篇
  1987年   1169篇
  1986年   1186篇
  1985年   1467篇
  1984年   1316篇
  1983年   1286篇
  1982年   1265篇
  1981年   1182篇
  1980年   1167篇
  1979年   1281篇
  1978年   1219篇
  1977年   1126篇
  1976年   1011篇
  1975年   817篇
  1974年   827篇
  1973年   789篇
  1971年   643篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
251.
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   
252.
The web coverage of the research activities of the VINITI RAS is considered. The practicability of using various information retrieval systems for obtaining information relevant to the Institute’s functioning and results is analyzed.  相似文献   
253.
信用信息是反应信用交易各方信用行为的信息,是解决信息不对称问题的关键。本文系统研究了信用及信用信息的概念及联系,并从信用信息服务中的主客体关系入手,对信用信息服务的流程及作用机理进行了深入分析。  相似文献   
254.
Conclusions Palestinian teachers at the pre-collegiate level who participate in the CEEPAT programme will, it is hoped, learn to place new emphasis on enhancement of their students' analytical skills and discourage an identification of knowledge with memorisation. For their part, Palestinian professors who have been trained to teach in the programme will presumably constitute a growing reservoir of talent which may be expected to raise the quality of Palestinian university education. Plans are now under way to give all Palestinians teaching under the auspices of CEEPAT an opportunity to attend an annual, three-week winter seminar in Gaza and/or a summer seminar in the United States, both of which will focus on issues of pedagogy and methodology. Such professors can be expected to pass on their new understanding of teaching via discussion to their colleagues and to their university students, thereby spreading an important pedagogical method to other segments of the Palestinian... community. 7 CEEPAT clearly has the potential to make a significant contribution to the elevation of educational standards in Palestine at a time of major historical change.In Palestine, higher education of quality is obviously a very serious business. It is understood that it underlies any possibility of individual betterment, economic development, or the evolution of an independent Palestinian state. If ever the Israeli occupation is completely terminated and the present financial crisis of the universities is solved, Palestinian university and post-baccalaureate training may reasonably be expected to become fully competitive on an international scale.  相似文献   
255.
Our paper analyzes the conduct of German public performing arts institutions in terms of non-market decision making or public choice. Apart from consumers of performing arts managers of performing arts institutions and public donors are main agents. A manager of a performing arts institution will not assume that the number of visitors is independent of his institution's programme or the ticket prices. By the same reasoning he will regard the amount of public subsidies not as exogenous, but dependent on his own policy. If future grants depend on present and past success (however defined), this will feed back into managerial decisions, along with expectations about demand. Data for the Federal Republic of Germany serve to empirically support the theoretical argument.  相似文献   
256.
Book reviews     
cAbd al‐Malik b. Habib. Kitāb al‐Ta'rij (La historia). Edición y estudio por Jorge Aguadé. Madrid: Consejo Superior de Investigaciones Científicas & Instituto de Cooperación con el Mundo Arabe, 1991 (Fuentes Arabico‐Hispanas, 1). 163 + 224 pp. [Arabic title: Kltāb al‐Ta'tikh]

Kedar, Benjamin Z., ed. The Horns of Hattin. Jerusalem and London: Yad Izhak Ben‐Zvi, Israel Exploration Society and Variorum 1992. 368 pp., 12 plates; $74.75 (cloth).

Köprülü, Mehmed Fuad. The Seljuks of Anatolia: Their History and Culture According to Local Muslim Sources. Translated and edited by Gary Leiser. Salt Lake City: University of Utah, 1992. xi +101 pp., $22.00 (cloth).

Cameron, Averil and Conrad, Lawrence I., eds. The Byzantine and Early Islamic Near East: Problems in the Literary Source Material (Papers in the First Workshop on Late Antiquity and Early Islam). Princeton: The Darwin Press, 1992. xiv + 428pp., 12 plates; $29.25 (cloth).

Vereno, Ingolf. Studien zum ältesten alchemistischen Schrifttum. Berlin: Klaus Schwarz Verlag, 1992 (Islamkundliche Untersuchungen, 155). 414pp.

Tolan, John. Petrus Alfonsi and his Medieval Readers. Gainesville, Florida: University Press of Florida, 1993. xv + 288pp., $34.95 (cloth), $16.95 (paper).

Lassner, Jacob. Demonizing the Queen of Sheba: Boundaries of Gender and Culture in Postbiblical Judaism and Medieval Islam. Chicago: University of Chicago, 1994. 281 pp., $19.95 (paper), $49.95 (cloth).

Menocal, María Rosa. Shards of Love: Exile and the Origins of the Lyric. Durham, North Carolina: Duke University Press, 1994. xv + 295pp., $34.95 (cloth), $14.95 (paper).

Massignon, Louis. The Passion of al‐Hallāj, Mystic and Martyr of Islam. Translated and edited by Herbert Mason. Abridged edition, Bollingen Series XCVIII. Princeton: Princeton University Press, 1994. xxxi + 293pp.

Viguera Molins, Maria Jesús. El Islam en Aragón. Saragossa: Caja de Ahorros de la Inmaculada, 1995 (Colección “Mariano de Pano y Ruata”, 9), 174 pp., 182 ills. in colour, maps, diagrams, charts etc No price stated.  相似文献   

257.
In 1991, the Reference and Information Services staff of the Alfred Taubman Medical Library at the University of Michigan gathered data on the use of the reference desk, including the frequency and types of assistance requested by different user groups throughout the year. Recommendations based on the results of this study led to improved service as well as more efficient use of staff resources.  相似文献   
258.
259.
The purpose of the study was to identify the pattern of publication about women and AIDS in scientific journals. Bradford zones were identified in each of six databases. The study determined that journal scatter for this subset of AIDS literature differed from the scatter in the general literature; further, the information indexed in the six electronic sources demonstrated little overlap. Consequently, key journal and newsletter titles identified by this study should form the core of any collection focusing on women and AIDS. The assurance of quality patient care management demands that librarians consult multiple resources for information retrieval that can assist health care providers, patients, and caregivers to enhance quality of life as well as to provide optimum care.  相似文献   
260.
The Impact of Museum Purchase on the Auction Prices of Paintings   总被引:1,自引:1,他引:0  
This study examines how art museumspurchasing policy influences the auction prices ofpaintings. Using a cross section of non-speculativetransactions during the period 1820–1970, we findconsiderable empirical support for the hypothesisthat public museums outside the U.S. pay above averageprices in auction markets providing higher thanaverage yields to private sellers. The typical U.S.private museums appear to be more restricted byfinancial constraints and the development of thegeneral economic conditions than their publiccounterparts.  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