全文获取类型
收费全文 | 7632篇 |
免费 | 109篇 |
国内免费 | 200篇 |
专业分类
系统科学 | 300篇 |
丛书文集 | 202篇 |
教育与普及 | 167篇 |
理论与方法论 | 482篇 |
现状及发展 | 182篇 |
综合类 | 6603篇 |
自然研究 | 5篇 |
出版年
2024年 | 9篇 |
2023年 | 24篇 |
2022年 | 65篇 |
2021年 | 105篇 |
2020年 | 102篇 |
2019年 | 119篇 |
2018年 | 69篇 |
2017年 | 70篇 |
2016年 | 93篇 |
2015年 | 188篇 |
2014年 | 396篇 |
2013年 | 274篇 |
2012年 | 408篇 |
2011年 | 516篇 |
2010年 | 413篇 |
2009年 | 435篇 |
2008年 | 464篇 |
2007年 | 691篇 |
2006年 | 556篇 |
2005年 | 548篇 |
2004年 | 443篇 |
2003年 | 443篇 |
2002年 | 306篇 |
2001年 | 263篇 |
2000年 | 179篇 |
1999年 | 125篇 |
1998年 | 128篇 |
1997年 | 86篇 |
1996年 | 85篇 |
1995年 | 75篇 |
1994年 | 51篇 |
1993年 | 48篇 |
1992年 | 49篇 |
1991年 | 22篇 |
1990年 | 23篇 |
1989年 | 27篇 |
1988年 | 19篇 |
1987年 | 14篇 |
1986年 | 4篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 1篇 |
排序方式: 共有7941条查询结果,搜索用时 31 毫秒
51.
1989年之后,新型劳动关系逐渐引起人们的关注,而相关的研究也随之方兴未艾。新型劳动关系的研究背景与意义、内涵与特征、建立条件与机制建设、基本评价与发展思路等问题得到了比较深入的探讨。这些研究的特点与不足需要被客观地加以检视。 相似文献
52.
李静 《科技情报开发与经济》2007,17(26):189-190
介绍了笛卡儿以前人们对惯性定律的认识,阐述了笛卡儿及其同时代人对惯性定律的贡献以及牛顿对这一问题的总结。 相似文献
53.
蔡家宗 《玉林师范学院学报》2007,28(4):141-145
本文分析当前理科大学生人文素质教育的状况,阐述加强理科大学生人文素质教育的重要意义,并提出了加强理科大学生人文素质教育的主要途径和方法。 相似文献
54.
刘隽 《科技情报开发与经济》2007,17(15):214-215
论述了项目部开展团队学习的重要性,介绍了优胜基准的概念,探讨了开展“优胜基准”活动的具体程序及其阻力因素,提出了相应建议。 相似文献
55.
基于对山东省农民收入与农村土地使用状况的调查,发现农民人均收入与人均耕地资源的占有呈负相关关系,并对其形成原因进行了剖析,对农民增收、实现农村现代化的策略进行了探讨。 相似文献
56.
57.
Rein Vihalemm 《Foundations of Science》2007,12(3):223-234
The philosophical analysis of chemistry has advanced at such a pace during the last dozen years that the existence of philosophy of chemistry as an autonomous discipline cannot be doubted any more. The present paper will attempt to analyse the experience of philosophy of chemistry at the, so to say, meta-level. Philosophers of chemistry have especially stressed that all sciences need not be similar to physics. They have tried to argue for chemistry as its own type of science and for a pluralistic understanding of science in general. However, when stressing the specific character of chemistry, philosophers do not always analyse the question ‘What is science?’ theoretically. It is obvious that a ‘monistic’ understanding of science should not be based simply on physics as the epitome of science, regarding it as a historical accident that physics has obtained this status. The author’s point is that the philosophical and methodological image of science should not be chosen arbitrarily; instead, it should be theoretically elaborated as an idealization (theoretical model) substantiated on the historical practice of science. It is argued that although physics has, in a sense, justifiably obtained the status of a paradigm of science, chemistry, which is not simply a physical science, but a discipline with a dual character, is also relevant for elaborating a theoretical model of science. The theoretical model of science is a good tool for examining various issues in philosophy of chemistry as well as in philosophy of science or science studies generally. 相似文献
58.
On the face of it, the directors of new large scientific projects have an impossible task. They have to make technical decisions about sciences in which they have never made a research contribution—sciences in which they have no contributory expertise. Furthermore, these decisions must be accepted and respected by the scientists who are making research contributions. The problem is discussed in two interviews conducted with two directors of large scientific projects. The paradox is resolved for the managers by their use of interactional and referred expertise. The same analysis might be applicable to management in general. An Appendix, co-authored with Jeff Shrager, compares the notion of referred expertise with contributory expertise. 相似文献
59.
A New Discipline of Science-The Study of Open Complex Giant System and Its Methodology 总被引:2,自引:0,他引:2
Qian XuesenChina Association for Science Technology Beijing ChinaYu JingyuanBeijing Institute of Information Control P.O.Box Beijing ChinaDai RuweiInstitute of Automation Chinese Academy of Sciences Beijing China 《系统工程与电子技术(英文版)》1993,(2)
This paper introduces the conception of open complex giant system and the methodology for dealing with the system, with stress on its profound significance in development of science and technology. The authors conclude that the reductionism underlying the exact science is not suitable to open complex giant system, and the only feasible alternative is the meta-synthetic engineering from the qualitative to the quantitative. 相似文献
60.
强调了毕业设计是工科特别是职业技术师范院校本科学生一门十分重要的必修实践课程。分析了我院工科本科专业毕业设计的现状及所存在的问题后,着重阐述了全面提高毕业设计质量的改革策略。 相似文献