全文获取类型
收费全文 | 100388篇 |
免费 | 8384篇 |
国内免费 | 4304篇 |
专业分类
电工技术 | 5661篇 |
技术理论 | 6篇 |
综合类 | 6360篇 |
化学工业 | 16770篇 |
金属工艺 | 6196篇 |
机械仪表 | 7010篇 |
建筑科学 | 8136篇 |
矿业工程 | 3431篇 |
能源动力 | 2936篇 |
轻工业 | 6410篇 |
水利工程 | 1691篇 |
石油天然气 | 7424篇 |
武器工业 | 815篇 |
无线电 | 10821篇 |
一般工业技术 | 11722篇 |
冶金工业 | 4917篇 |
原子能技术 | 1063篇 |
自动化技术 | 11707篇 |
出版年
2024年 | 465篇 |
2023年 | 1805篇 |
2022年 | 3179篇 |
2021年 | 4341篇 |
2020年 | 3372篇 |
2019年 | 2727篇 |
2018年 | 2948篇 |
2017年 | 3333篇 |
2016年 | 3071篇 |
2015年 | 4138篇 |
2014年 | 4945篇 |
2013年 | 5908篇 |
2012年 | 6365篇 |
2011年 | 6789篇 |
2010年 | 5814篇 |
2009年 | 5579篇 |
2008年 | 5412篇 |
2007年 | 5123篇 |
2006年 | 5470篇 |
2005年 | 4765篇 |
2004年 | 3025篇 |
2003年 | 2866篇 |
2002年 | 2682篇 |
2001年 | 2428篇 |
2000年 | 2352篇 |
1999年 | 2660篇 |
1998年 | 2116篇 |
1997年 | 1759篇 |
1996年 | 1723篇 |
1995年 | 1438篇 |
1994年 | 1171篇 |
1993年 | 751篇 |
1992年 | 655篇 |
1991年 | 442篇 |
1990年 | 356篇 |
1989年 | 302篇 |
1988年 | 229篇 |
1987年 | 155篇 |
1986年 | 124篇 |
1985年 | 74篇 |
1984年 | 54篇 |
1983年 | 44篇 |
1982年 | 43篇 |
1981年 | 29篇 |
1980年 | 27篇 |
1979年 | 17篇 |
1978年 | 1篇 |
1965年 | 1篇 |
1959年 | 2篇 |
1951年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 7 毫秒
1.
Anaerobic co-digestion of food waste and FOG with sewage sludge – realising its potential in Ireland
Olumide Wesley Awe Yaqian Zhao Ange Nzihou Doan Pham Minh Nathalie Lyczko 《The International journal of environmental studies》2018,75(3):496-517
The severe environmental pollution in many countries is caused by indiscriminate discharge of large quantities of food waste (FW), fat oil and grease (FOG) and sewage sludge (SS) to the environment. There are many possible treatment routes, but anaerobic digestion (AD) is now well accepted for treating several kinds of organic wastes. But AD of FW alone presents some operational challenges because of substrates and variability. Anaerobic co-digestion of two or more substrates is better than single substrate digestion. This can use a plant’s unused capacity, in line with the trend to renewable energy. Co-digestion technology, although well established in many European countries, is still in its infancy in Ireland. There are problems with different regulatory arrangements. They should be resolved. The paper reviews anaerobic co-digestion technology is reviewed, with special focus on possible application in Ireland. 相似文献
2.
3.
4.
5.
结合目前国外钻机现状以及国际石油钻井市场对钻机的配套要求,分析指出我国目前陆地钻机存在的不足与差距,对我国钻机及其配套技术的发展提出建议。 相似文献
6.
7.
8.
9.
10.
Research funding has been seen as one of the most important resource in the reward system of science. And usage of publications denotes an interesting perspective of user behavior in scientific communication. This study aims to address the relationship between funding and Usage Count, which is a new metrics item established on the platform of Web of Science. Full records of 300,010 articles published in 2013 were downloaded in October 2015, and divided into six disciplines, including information science library science, education educational research, economics, computer science, materials science, and chemistry. Seven indicators were proposed to measure the impact, including Funding rate, Citation per paper, Usage rate, Usage per paper, Citation difference, Usage difference, and Conversion rate. It concluded funding has impact on usage and citation, and funded papers attract more usage, but varying in different disciplines. Usage Count can be used in the extension of citation metrics but with limits. This study originally engages with usage metrics and detected that there is positive correlation between usage and funding. 相似文献