全文获取类型
收费全文 | 2487篇 |
免费 | 174篇 |
国内免费 | 4篇 |
学科分类
工业技术 | 2665篇 |
出版年
2024年 | 9篇 |
2023年 | 24篇 |
2022年 | 51篇 |
2021年 | 87篇 |
2020年 | 78篇 |
2019年 | 74篇 |
2018年 | 150篇 |
2017年 | 139篇 |
2016年 | 179篇 |
2015年 | 110篇 |
2014年 | 139篇 |
2013年 | 349篇 |
2012年 | 131篇 |
2011年 | 160篇 |
2010年 | 167篇 |
2009年 | 141篇 |
2008年 | 124篇 |
2007年 | 116篇 |
2006年 | 58篇 |
2005年 | 47篇 |
2004年 | 53篇 |
2003年 | 22篇 |
2002年 | 32篇 |
2001年 | 14篇 |
2000年 | 16篇 |
1999年 | 16篇 |
1998年 | 25篇 |
1997年 | 9篇 |
1996年 | 17篇 |
1995年 | 7篇 |
1994年 | 6篇 |
1993年 | 7篇 |
1992年 | 7篇 |
1991年 | 5篇 |
1990年 | 8篇 |
1988年 | 2篇 |
1987年 | 7篇 |
1986年 | 3篇 |
1985年 | 11篇 |
1984年 | 10篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 13篇 |
1980年 | 6篇 |
1978年 | 2篇 |
1976年 | 6篇 |
1975年 | 2篇 |
1974年 | 5篇 |
1973年 | 3篇 |
1972年 | 3篇 |
排序方式: 共有2665条查询结果,搜索用时 31 毫秒
1.
2.
3.
4.
5.
This DFG-funded research project aimed to gain a better understanding of the mechanisms of the W-Cl repair principle within the framework of fundamental investigations, to contribute to the creation of the necessary basis for a broader application of the repair principle in practice. The focus was on the development of a model to describe the chloride redistribution after the application of a system sealing surface protective coating. On the basis of Fick's second law of diffusion, a mathematical model with a self-contained analytical solution was developed, with the help of which the chloride redistribution after application of a system sealing surface protective coating can be calculated under the idealized assumption of complete water saturation of the concrete. Furthermore, the influence of the dehydration of the concrete, expected as a result of the application of the repair principle W-Cl, on the chloride redistribution was investigated. On the basis of laboratory tests and numerical simulations, material-specific reduction functions were developed to quantify the relationship between the chloride diffusion coefficient and the ambient humidity. 相似文献
6.
7.
Physically based simulation of human hair is a well studied and well known problem. But the “pure” physically based representation of hair (and other animation elements) is not the only concern of the animators, who want to “control” the creation and animation phases of the content. This paper describes a sketch-based tool, with which a user can both create hair models with different styling parameters and produce animations of these created hair models using physically and key frame-based techniques. The model creation and animation production tasks are all performed with direct manipulation techniques in real-time. 相似文献
8.
Ayhan Demirbas M. Masuk Kü ü k Yunus Erdogan M. Ya in Nutku Oktay Torul 《Petroleum Science and Technology》1992,10(2):185-197
A kinetic study of pyrolysis of dried black liquor was performed using a Netzsch 429 Thermogravimetric Analyzer. It was found that as conversion increases from 10 to 45% the apparent pyrolysis activation energy for black liquor increases from 77.20 to 112.74 KJ/mol. For black liquor the order of reaction was found to be first-order. The reaction rate constant was found to be 2.12×109 min. These results are in agreement with the data reported by other investigators on biomass pyrolysis. 相似文献
9.
In this study forecast of Turkey's net electricity energy consumption on sectoral basis until 2020 is explored. Artificial neural networks (ANN) is preferred as forecasting tool. The reasons behind choosing ANN are the ability of ANN to forecast future values of more than one variable at the same time and to model the nonlinear relation in the data structure. Founded forecast results by ANN are compared with official forecasts. 相似文献
10.
Mustafa Ayhan Erkan Topal 《Tunnelling and Underground Space Technology incorporating Trenchless Technology Research》2005,20(1):81-87
Tunneling projects have their uniqueness in terms of engineering problems. The expertise gained from analyzing these projects establishes a sound basis for future application. This paper conveys experiences gained during the construction and support of the design of the Dicle–Kralkizi water tunnel, Turkey. Tunnel stability problems including overbreaks and surface subsidence are evaluated. An analysis of the breakdowns, factors controlling advance rate and the overall performance of tunnel are covered. The accumulated information presented here is believed to be useful and reliable for a successful tunnel excavation in similar formations. 相似文献