全文获取类型
收费全文 | 8157篇 |
免费 | 678篇 |
国内免费 | 436篇 |
学科分类
工业技术 | 9271篇 |
出版年
2024年 | 44篇 |
2023年 | 154篇 |
2022年 | 266篇 |
2021年 | 377篇 |
2020年 | 320篇 |
2019年 | 276篇 |
2018年 | 279篇 |
2017年 | 302篇 |
2016年 | 256篇 |
2015年 | 371篇 |
2014年 | 419篇 |
2013年 | 544篇 |
2012年 | 527篇 |
2011年 | 557篇 |
2010年 | 480篇 |
2009年 | 465篇 |
2008年 | 416篇 |
2007年 | 441篇 |
2006年 | 433篇 |
2005年 | 377篇 |
2004年 | 227篇 |
2003年 | 195篇 |
2002年 | 155篇 |
2001年 | 152篇 |
2000年 | 162篇 |
1999年 | 208篇 |
1998年 | 165篇 |
1997年 | 127篇 |
1996年 | 119篇 |
1995年 | 112篇 |
1994年 | 93篇 |
1993年 | 59篇 |
1992年 | 53篇 |
1991年 | 40篇 |
1990年 | 23篇 |
1989年 | 23篇 |
1988年 | 15篇 |
1987年 | 6篇 |
1986年 | 7篇 |
1985年 | 8篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1982年 | 5篇 |
1981年 | 1篇 |
1980年 | 3篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有9271条查询结果,搜索用时 31 毫秒
11.
Siqi Yu Qin Wang Jianwei Wang Yong Xiang Xiaobin Niu Tingshuai Li 《International Journal of Hydrogen Energy》2021,46(27):14331-14337
Artificial nitrogen fixation is emerging as a promising approach for synthesis of ammonia at mild conditions. Inspired by biological nitrogen fixation based on bacteria containing iron, zinc doped Fe2O3 nanoparticles are proposed as an efficient and earth abundant electrocatalyst for converting N2 to NH3. In neutral media, it achieves a maximum Faradaic efficiency (FE) of 10.4% and a large NH3 yield rate of 15.1 μg h?1 mg?1cat. at ?0.5 V vs. reversible hydrogen electrode. This catalyst also exhibits excellent selectivity and stability. Theoretical calculations suggest the reaction follows the associative enzymatic mechanism and it has a barrier of as low as 0.68 eV. 相似文献
12.
13.
14.
通过工程实例及理论分析 ,对横向风振“锁住区”问题进行了探讨 ,对《建筑结构荷载规范》(GB5 0 0 0 9— 2 0 0 1 )中有关这一方面内容存在的一些问题进行了分析 ,希望对工程设计人员能有所帮助 相似文献
15.
16.
对小型中间下料预焙电解槽技术条件摆布的原则和具体数据进行了探讨,提出了尽可能利用从大型预焙槽上得出的先进经验,并消化吸收,掌握好各种条件的平衡,以取得好经济技术指标的观点。 相似文献
17.
Zhishou Zhang Qibin Sun Wai-Choong Wong John Apostolopoulos Susie Wee 《Multimedia, IEEE Transactions on》2007,9(2):320-331
This paper proposes an optimized content-aware authentication scheme for JPEG-2000 streams over lossy networks, where a received packet is consumed only when it is both decodable and authenticated. In a JPEG-2000 codestream, some packets are more important than others in terms of coding dependency and image quality. This naturally motivates allocating more redundant authentication information for the more important packets in order to maximize their probability of authentication and thereby minimize the distortion at the receiver. Towards this goal, with the awareness of its corresponding image content, we formulate an optimization framework to compute an authentication graph to maximize the expected media quality at the receiver, given specific authentication overhead and knowledge of network loss rate. System analysis and experimental results demonstrate that the proposed scheme achieves our design goal in that the rate-distortion (R-D) curve of the authenticated image is very close to the R-D curve when no authentication is required 相似文献
18.
M.Y. Shen Z.B. ZhangX.L. Niu 《Computer Methods in Applied Mechanics and Engineering》2003,192(25):2703-2725
The generalized compact (GC) schemes and some of their important properties are presented. And a new way for constructing high order accuracy and high-resolution GC schemes is presented. The schemes constructed by using this way could satisfy some principles and demands prescribed in advance to ensure some desired properties to the schemes, such as the principle about suppression of the oscillations, the principle of stability, the order of accuracy and number of scheme points, etc. As two examples, a three-point third-order compact scheme and a three-point fifth-order GC scheme satisfying the principle about suppression of the oscillations and the principle of stability are described in this paper. Numerical results show that these schemes are shock-capturing. The time-dependent boundary conditions proposed by Thompson are well employed when the algorithm is applied to the Euler equations of gas dynamics. Fourier analysis shows that the resolution characteristics are spectral-like. 相似文献
19.
Li Jian-zhong Niu Zheng-meng Chen Gang Tan Li-xing Shaanxi Institute of Mechanical Engineering Xi''''an P.R.China 《水动力学研究与进展(B辑)》1993,(4)
This paper will introduce experimental studies and numerical calculation onturbulent boundary layer of water flow along curved surface in our country in recent years.Onthe basis of the experimental studies,the effects of curvature and roughness on velocitydistribution and pressure distribution and the change of turbulent flow boundary layer onoverflow bucket concave surface is discussed.We proposed the empirical formula of velocity,pressure and the change of turbulent flow boundary layer on outlet bucket concave.According tothe momentum principle,we have deduced the momentum integral equation full water depthboundary layer and using the element as control unit inside the boundary layer on concavesurface of bucket.Combining with continuity equation,we have computed the boundary layerdevelopment on the bucket of a spillway.Compared with the field experimental data,thecalculation results are available.Under polar coordinates,a mathematical model for simulatingtime-averaged flow characteristics in concave surface of bucket is established.The turbulent flowfield on concave surface of bucket is calculated by SIMPLE method and this mathematicalmodel.The flow velocity field,pressure field,distribution of turbulent kinetic energy,distribution of turbulent energy dissipating rate and distribution of shear stress are available.Thecalculation value is consistent with measured test data. 相似文献
20.
在各糖厂现用连续离心机原有生产实践基础上,对其机械吸震、加温、布温、机索结构、物料密封、机座等部件做了进一步改进,并取得可观的实效。 相似文献