全文获取类型
收费全文 | 287123篇 |
免费 | 3520篇 |
国内免费 | 814篇 |
专业分类
电工技术 | 5030篇 |
综合类 | 162篇 |
化学工业 | 45403篇 |
金属工艺 | 11895篇 |
机械仪表 | 8604篇 |
建筑科学 | 6846篇 |
矿业工程 | 1834篇 |
能源动力 | 6734篇 |
轻工业 | 25906篇 |
水利工程 | 3190篇 |
石油天然气 | 7086篇 |
武器工业 | 16篇 |
无线电 | 31448篇 |
一般工业技术 | 56927篇 |
冶金工业 | 51361篇 |
原子能技术 | 7532篇 |
自动化技术 | 21483篇 |
出版年
2021年 | 2098篇 |
2018年 | 3672篇 |
2017年 | 3622篇 |
2016年 | 3903篇 |
2015年 | 2464篇 |
2014年 | 4230篇 |
2013年 | 12017篇 |
2012年 | 6826篇 |
2011年 | 9212篇 |
2010年 | 7565篇 |
2009年 | 8642篇 |
2008年 | 8929篇 |
2007年 | 8813篇 |
2006年 | 7826篇 |
2005年 | 7309篇 |
2004年 | 6800篇 |
2003年 | 6553篇 |
2002年 | 6627篇 |
2001年 | 6497篇 |
2000年 | 6176篇 |
1999年 | 6229篇 |
1998年 | 14749篇 |
1997年 | 11029篇 |
1996年 | 8566篇 |
1995年 | 6523篇 |
1994年 | 5914篇 |
1993年 | 5787篇 |
1992年 | 4479篇 |
1991年 | 4440篇 |
1990年 | 4284篇 |
1989年 | 4301篇 |
1988年 | 4255篇 |
1987年 | 3598篇 |
1986年 | 3595篇 |
1985年 | 4161篇 |
1984年 | 3965篇 |
1983年 | 3620篇 |
1982年 | 3422篇 |
1981年 | 3558篇 |
1980年 | 3422篇 |
1979年 | 3365篇 |
1978年 | 3445篇 |
1977年 | 3923篇 |
1976年 | 5037篇 |
1975年 | 3158篇 |
1974年 | 3007篇 |
1973年 | 3024篇 |
1972年 | 2651篇 |
1971年 | 2473篇 |
1970年 | 2104篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
Akopdzhanyan T. G. Chemagina E. A. Borovinskaya I. P. 《Russian Journal of Non-Ferrous Metals》2020,61(6):686-690
Russian Journal of Non-Ferrous Metals - The synthesis and sintering of the (AlN)x(SiC)1 – x solid solution have been studied under conditions of self-propagating high-temperature synthesis... 相似文献
62.
The miniaturization has become a key word for advanced integrated circuits over the last few years. It is within this context that the fin field effect tra 相似文献
63.
An alternative Equivalent Electrical Circuit for Proton Exchange Membrane Fuel Cells is modelled in this study. Both I–V characteristics and H2 consumptions corresponding to generated power under load and no-load conditions are investigated. For this purpose, H2 consumptions and I–V characteristics of three different sized PEMFCs are tested. There is a very good harmony between the model results and measured values (relative error %0.7, %6.4 and %2.5 for FC-A, FC-B and FC-C respectively). In the proposed model current passes only on parallel resistance and not on serial resistance at no-load condition. Thus, a FC with higher parallel resistance should be preferred. Another key output of this study is that based on the proposed model, performance comparison of FCs can be performed with the parameters defined in this work. Proposals made in this study can easily be used for performance analysis of FCs under for both steady state and transient analysis. 相似文献
64.
65.
A conceptualization of intended learning outcomes supporting self‐regulated learners in indicating learning paths
下载免费PDF全文
![点击此处可从《Journal of Computer Assisted Learning》网站下载免费的PDF全文](/ch/ext_images/free.gif)
P. Tangworakitthaworn L. Gilbert G.B. Wills 《Journal of Computer Assisted Learning》2015,31(5):393-404
Intended learning outcomes (ILOs) indicate what learners will be able to achieve after they are taught. Traditionally, ILOs are expressed as plain text or unstructured documents. What if all ILOs of a specific course of study can be conceptualized through a structured diagrammatic technique? It was hypothesized that learners can benefit from this conceptualization in learning, especially in self‐regulated learning. The aim of this study was to investigate whether the ILOs represented in unstructured or structured formats can facilitate learners to identify learning paths. The results revealed that the mean ratings of all learning paths were statistically significantly higher with structured ILOs. 相似文献
66.
67.
68.
69.
70.