全文获取类型
收费全文 | 34464篇 |
免费 | 549篇 |
国内免费 | 37篇 |
专业分类
教育 | 25072篇 |
科学研究 | 3011篇 |
各国文化 | 285篇 |
体育 | 2592篇 |
综合类 | 41篇 |
文化理论 | 258篇 |
信息传播 | 3791篇 |
出版年
2021年 | 321篇 |
2020年 | 491篇 |
2019年 | 704篇 |
2018年 | 994篇 |
2017年 | 1075篇 |
2016年 | 989篇 |
2015年 | 602篇 |
2014年 | 821篇 |
2013年 | 6535篇 |
2012年 | 810篇 |
2011年 | 937篇 |
2010年 | 686篇 |
2009年 | 638篇 |
2008年 | 796篇 |
2007年 | 698篇 |
2006年 | 715篇 |
2005年 | 552篇 |
2004年 | 523篇 |
2003年 | 474篇 |
2002年 | 569篇 |
2001年 | 688篇 |
2000年 | 633篇 |
1999年 | 615篇 |
1998年 | 324篇 |
1997年 | 364篇 |
1996年 | 407篇 |
1995年 | 366篇 |
1994年 | 329篇 |
1993年 | 344篇 |
1992年 | 509篇 |
1991年 | 469篇 |
1990年 | 506篇 |
1989年 | 509篇 |
1988年 | 496篇 |
1987年 | 415篇 |
1986年 | 424篇 |
1985年 | 496篇 |
1984年 | 422篇 |
1983年 | 451篇 |
1982年 | 356篇 |
1981年 | 344篇 |
1980年 | 316篇 |
1979年 | 446篇 |
1978年 | 362篇 |
1977年 | 335篇 |
1976年 | 290篇 |
1975年 | 243篇 |
1974年 | 229篇 |
1973年 | 256篇 |
1971年 | 193篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
101.
102.
The current societal and professional context presents a variety of ethical challenges to decision makers. The importance of educational preparation for ethical decision-making and ethical leadership has been addressed in the literature of library and information science (LIS), among other professions. However, it can be quite difficult to measure the impact of professional ethics education on students. This article is based on an evaluation of published original research related to ethics education in disciplines supported by professional education, including education, nursing, allied health, journalism, social work, public health, engineering, and LIS. The study considers data related to research design, methodologies used, populations studied, approaches to measuring impact, levels of impact, and publication in the journal literature. Results indicate more extensive research in education and nursing as compared with other fields, a lack of baseline data gathering for comparison, a reliance on a limited number of data-gathering techniques, and a tendency toward studying alumni over current students 相似文献
103.
104.
Zhao RL Desjardin DE Soytong K Hyde KD 《Journal of Zhejiang University. Science. B》2008,9(10):779-786
We present an overview of previous research results on the molecular phylogenetic analyses in Agaricales and its higher ranks (Agaricomycetes/Agaricomycotina/Basidiomycota) along with the most recent treatments of taxonomic systems in these taxa. Establishing phylogenetic hypotheses using DNA sequences, from which an understanding of the natural evolutionary relationships amongst clades may be derived, requires a robust dataset. It has been recognized that single-gene phylogenies may not truly represent organismal phylogenies, but the concordant phylogenetic genealogies from multiple-gene datasets can resolve this problem. The genes commonly used in mushroom phylogenetic research are summarized. 相似文献
105.
106.
107.
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
108.
109.
A. V. Suvorinov A. V. Anyutin V. S. Sokolovskaya V. I. Fedorov 《Scientific and Technical Information Processing》2008,35(2):63-67
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
110.
基于专利引文分析的时间线技术 总被引:3,自引:0,他引:3
在对专利引文可视化技术现状进行分析的基础上,将基于引文分析的时间线技术运用到专利文献的可视化分析。详细阐述该技术的理论依据、设计思想,并用美国专利数据库中的DVD激光头专利进行技术应用,证明该技术能揭示专利文献中的技术热点及其发展演变,并挖掘关键技术。 相似文献