全文获取类型
收费全文 | 5006篇 |
免费 | 103篇 |
国内免费 | 254篇 |
专业分类
教育 | 2528篇 |
科学研究 | 1191篇 |
各国文化 | 3篇 |
体育 | 144篇 |
综合类 | 95篇 |
文化理论 | 8篇 |
信息传播 | 1394篇 |
出版年
2024年 | 4篇 |
2023年 | 27篇 |
2022年 | 64篇 |
2021年 | 119篇 |
2020年 | 165篇 |
2019年 | 208篇 |
2018年 | 186篇 |
2017年 | 175篇 |
2016年 | 99篇 |
2015年 | 153篇 |
2014年 | 378篇 |
2013年 | 614篇 |
2012年 | 372篇 |
2011年 | 447篇 |
2010年 | 271篇 |
2009年 | 299篇 |
2008年 | 352篇 |
2007年 | 312篇 |
2006年 | 285篇 |
2005年 | 218篇 |
2004年 | 139篇 |
2003年 | 112篇 |
2002年 | 106篇 |
2001年 | 85篇 |
2000年 | 37篇 |
1999年 | 23篇 |
1998年 | 24篇 |
1997年 | 23篇 |
1996年 | 19篇 |
1995年 | 7篇 |
1994年 | 12篇 |
1993年 | 9篇 |
1992年 | 9篇 |
1990年 | 5篇 |
1985年 | 2篇 |
1982年 | 1篇 |
1978年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有5363条查询结果,搜索用时 31 毫秒
121.
论科技查新中的新颖性 总被引:7,自引:0,他引:7
本文从对查新工作中新颖性的认识基点出发,谈论了提升自主创新评价基础的完善因素。运用科学方法强化科技查新工作,能够对查新技术项目所述技术方案的未来发展的成果趋势以及价值程度。进行较为科学的预测评估和判断。 相似文献
122.
进一步提高自然科学基金资助项目的创新性之研究 总被引:5,自引:1,他引:5
中国国家自然科学基金委员会(NSFC)成立十年来,大力支持基础研究,强调了支持创新的政策,结出了丰硕的成果,证明科技体制改革迈出的这一步是十分正确的.但通过问卷调查,也发现目前无论是从体制、评审程序、资助政策、专家的遴选使用和管理上,都还存在一些不利于创新的因素.如何克服这些不利因素,文中提出了13点具体改进措施 相似文献
123.
It is a commonly held view that differences in national histories, cultures, political contexts, and the timing of a country’s entry into the industrialization process are reflected as diversity among countries in their goals, priorities, boundaries, directions, ranges, instruments and also in the performance of science and technology policy. This article, which examines development processes of Finnish science and technology policy, concludes that instead of divergence there is such startling convergence of organizational forms and practices. Finland has largely adopted its policy doctrines and instruments from the countries, which from the Finnish perspective, have been considered legitimate and successful. 相似文献
124.
Linus Dahlander 《Research Policy》2006,35(8):1243-1259
Since Teece's seminal paper explaining who were the gainers from technological innovation, increased globalization and the information and communication technology revolution have brought new ways for firms to organize and appropriate from innovation. A new more open model of innovation suggests that firms can benefit from sources of innovation that stem from outside the firm. The central theme of this paper is how firms try to unlock communities as complementary assets. These communities exist outside firm boundaries beyond ownership or hierarchical control. Because of practices developed by communities to protect their work, firms need to assign individuals to work in these communities in order to gain access to developments and, to an extent, influence the direction of the community. Using network analysis we show that some software firms sponsor individuals to act strategically within a free and open source software (FOSS) community. Firm sponsored individuals interact with more individuals than interact with them, and also they seek to interact with central individuals in the community. However, we can see differences in how individuals interact, depending on whether their affiliation is with a dedicated FOSS firm or an incumbent in the software industry. Apparently, some firm managers believe they need ‘a man on the inside’ to be able to gain access to communities. 相似文献
125.
《情报科学》引文分析 总被引:5,自引:3,他引:5
本文统计了2000年至2002年《情报科学》载文的引文,重点对这些引文(参考文献)的数量、来源、著者、年代和语种等方面进行统计与分析。 相似文献
126.
拷贝硅谷:一种聚集网络理论解释 总被引:1,自引:0,他引:1
介绍了目前在关于拷贝硅谷问题上国内外不同的观点,提出聚集网络理论。在此基础上,通过对韩国大德科学城和我国台湾新竹科学工业园的成功实践考察,分析了它们各自成功发展高技术产业的原因,在于根据各自的实际,市场性和建构性、网络资本和风险资本网络的有机结合,适应了高技术发展的本质要求。认为我国应注重网络资源管理,营造风险资本网络体系发展的环境。 相似文献
127.
128.
台湾“开放型”科技产业政策研究 总被引:2,自引:0,他引:2
本文以台湾“科技导向”的发展战略为脉络 ,分析了“开放型”科技产业政策产生的动因及实施效果 ;剖析了由“开放”转向“紧缩”的弊端 ;对科技产业政策的稳定性与协同性提出了若干浅见。 相似文献
129.
Two property regimes for software development may be distinguished. Within corporations, on the one hand, a Private Regime obtains which excludes all outsiders from access to a firm's software assets. It is shown how the protective instruments of secrecy and both copyright and patent have been strengthened considerably during the last two decades. On the other, a Public Regime among hackers may be distinguished, initiated by individuals, organizations or firms, in which source code is freely exchanged. It is argued that copyright is put to novel use here: claiming their rights, authors write ‘open source licenses’ that allow public usage of the code, while at the same time regulating the inclusion of users. A ‘regulated commons’ is created. The analysis focuses successively on the most important open source licenses to emerge, the problem of possible incompatibility between them (especially as far as the dominant General Public License is concerned), and the fragmentation into several user communities that may result. 相似文献
130.
《International Journal of Information Management》2016,36(4):607-617
While Data Science has become increasingly significant for business strategies, operations, performance, efficiency and prediction, there is little work on this to provide a detailed guideline. We have proposed a Business Data Science (BDS) model that focuses on the model and experimental development that allows different types of functions, processes and roles to work together collaboratively for efficiency and performance improvements. Details with examples have been illustrated to show that BDS model can be a robust model. Future directions have been discussed to ensure that business intelligence, security, analytics and research contributions to BDS can be achieved. 相似文献