全文获取类型
收费全文 | 3637篇 |
免费 | 20篇 |
国内免费 | 1篇 |
专业分类
教育 | 2536篇 |
科学研究 | 430篇 |
各国文化 | 35篇 |
体育 | 253篇 |
综合类 | 1篇 |
文化理论 | 38篇 |
信息传播 | 365篇 |
出版年
2021年 | 36篇 |
2020年 | 42篇 |
2019年 | 95篇 |
2018年 | 160篇 |
2017年 | 119篇 |
2016年 | 119篇 |
2015年 | 65篇 |
2014年 | 94篇 |
2013年 | 778篇 |
2012年 | 67篇 |
2011年 | 73篇 |
2010年 | 69篇 |
2009年 | 70篇 |
2008年 | 81篇 |
2007年 | 72篇 |
2006年 | 66篇 |
2005年 | 55篇 |
2004年 | 56篇 |
2003年 | 45篇 |
2002年 | 44篇 |
2001年 | 33篇 |
2000年 | 34篇 |
1999年 | 40篇 |
1998年 | 36篇 |
1997年 | 27篇 |
1996年 | 32篇 |
1995年 | 28篇 |
1994年 | 36篇 |
1993年 | 40篇 |
1992年 | 45篇 |
1991年 | 36篇 |
1990年 | 39篇 |
1989年 | 51篇 |
1988年 | 39篇 |
1987年 | 38篇 |
1986年 | 41篇 |
1985年 | 46篇 |
1984年 | 46篇 |
1983年 | 34篇 |
1982年 | 39篇 |
1981年 | 43篇 |
1980年 | 31篇 |
1979年 | 42篇 |
1978年 | 30篇 |
1977年 | 30篇 |
1976年 | 34篇 |
1973年 | 26篇 |
1939年 | 23篇 |
1937年 | 41篇 |
1936年 | 40篇 |
排序方式: 共有3658条查询结果,搜索用时 343 毫秒
11.
Markus Keidl Alfons Kemper Donald Kossmann und Alexander Kreutz 《Informatik - Forschung und Entwicklung》2002,17(3):123-134
Zusammenfassung. Wir pr?sentieren in dieser Arbeit das ObjectGlobe-System, ein offenes und verteiltes Anfragebearbeitungssystem auf Internet-Datenquellen.
ObjectGlobe erweitert die begrenzten F?higkeiten des Internets bezüglich Anfragebearbeitung, indem es einen offenen Marktplatz
schafft, in dem eine Vielzahl von Anbietern Rechenzeit, Daten und Anfrageoperatoren bereitstellen. Den Schwerpunkt dieses
Beitrags bildet die im Rahmen des ObjectGlobe-Projekts entwickelte Metadatenverwaltung MDV, ein verteiltes Metadaten-Management-System.
Es besitzt eine 3-schichtige Architektur und unterstützt Caching und Replikation in der Mittelschicht, so dass Anfragen lokal
ausgewertet werden k?nnen. Benutzer spezifizieren die Informationen, die sie ben?tigen und die repliziert werden, mit Hilfe
einer besonderen Regelsprache. Um Replikate aktuell zu halten und die Replikation von neuen und relevanten Informationen anzusto?en,
verwendet das MDV-System einen neuartigen Publish & Subscribe-Algorithmus. Wir beschreiben diesen Algorithmus im Detail und
zeigen, wie er mit Hilfe eines normalen relationalen Datenbanksystems implementiert werden kann.
Eingegangen am 19. November 2001 / Angenommen am 30. Juli 2002 相似文献
12.
This study examined the argument patterns that result when Israeli-Jews and Palestinians confront each other during group dialogues. We tested predictions derived from two theories. The first was a theory of cultural communication which predicted that Israeli-Jews and Palestinians would argue in a manner consistent with their respective cultural communication codes known as dugri and musayra respectively. Thus, the Israeli-Jews were expected to be assertive and the Palestinians more accommodating. The second theory was rooted in majority/minority power relations and predicted the opposite. The data were generated from reconciliation-based dialogue groups of Israeli-Jews and Palestinians. Communicative acts were coded according to the Conversational Argument Coding Scheme. Analysis of covariance was used to determine which patterns of argument distinguished the groups, and to identify variance attributable to lag sequences and individuals. The results were supportive of predictions from majority/minority power relations. 相似文献
13.
14.
15.
Kwafo-akoto KO 《Aslib proceedings》1988,40(4):105-110
Acquiring both published and unpublished documents produced in Africa is, generally, a difficult task due to the existing poor state of bibliographic control and the publishing industry. It is even more difficult to obtain unpublished documents in a specialized area of study such as demography--a diffuse area which cuts across several disciplines. This paper discusses the problems encountered on acquisition trips to some African countries to acquire unpublished population material. To help solve the problems, the Population Association of Africa must persuade its members to send copies of their publications to population libraries and documentation centers in their individual countries for dissemination to the other users in Africa. The various organizations and institutions in Africa engaged in the teaching and research of population studies should have an agreement to exchange copies of their theses. The Economic Commission for Africa (ECA) and the Organization of African Unity (OAU) should make representations to the various African member countries on the need to disseminate the results of vital censuses and surveys conducted. Finally, the Population Information Network for Africa (POPIN-AFRICA) with its coordinating unit at the population division of ECA should ensure that all the nodes of the network have the financial and other resources to be able to acquire the relevant documents needed for their operations. 相似文献
16.
Joel O. Iverson - Joel O. Iverson is currently an assistant professor in the 《Journal of Applied Communication Research》2008,36(2):176-199
Knowing is an enacted, communicated process that is difficult to observe, let alone manage, in organizations. Communities of practice (CoPs) offer a productive solution for improving knowledge and knowledge management, but the communicative processes that enact CoPs have not been explored, leaving CoPs as an organizational black box. This research extends CoP theory as a means to determine the presence of a CoP and distinguish between various CoPs, and as a practical means to evaluate the communicative processes of organizational knowledge. CoPs enact the communicative nature of knowing through the elements of mutual engagement, negotiation of a joint enterprise, and shared repertoire. Specifically, two groups of volunteers are examined through a combination of participation, observation, and interviews in order to explore CoP theory as a dynamic system for examining and evaluating organizational knowledge. 相似文献
17.
V. A. Frolova S. K. Khasenova T. Sh. Kubieva O. A. Rog 《Scientific and Technical Information Processing》2008,35(2):104-106
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
18.
N. Yu. Berezkina O. N. Sikorskaya 《Scientific and Technical Information Processing》2008,35(6):256-259
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
19.
20.
O. P. Morozova 《Scientific and Technical Information Processing》2008,35(3):153-154
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