全文获取类型
收费全文 | 397篇 |
免费 | 15篇 |
国内免费 | 22篇 |
专业分类
电工技术 | 3篇 |
综合类 | 6篇 |
化学工业 | 20篇 |
金属工艺 | 76篇 |
机械仪表 | 28篇 |
建筑科学 | 14篇 |
能源动力 | 25篇 |
轻工业 | 4篇 |
水利工程 | 4篇 |
石油天然气 | 6篇 |
无线电 | 3篇 |
一般工业技术 | 113篇 |
冶金工业 | 3篇 |
原子能技术 | 119篇 |
自动化技术 | 10篇 |
出版年
2024年 | 1篇 |
2023年 | 3篇 |
2022年 | 9篇 |
2021年 | 20篇 |
2020年 | 18篇 |
2019年 | 10篇 |
2018年 | 15篇 |
2017年 | 25篇 |
2016年 | 28篇 |
2015年 | 16篇 |
2014年 | 23篇 |
2013年 | 27篇 |
2012年 | 27篇 |
2011年 | 46篇 |
2010年 | 16篇 |
2009年 | 33篇 |
2008年 | 23篇 |
2007年 | 23篇 |
2006年 | 18篇 |
2005年 | 16篇 |
2004年 | 9篇 |
2003年 | 10篇 |
2002年 | 4篇 |
2001年 | 1篇 |
2000年 | 3篇 |
1999年 | 6篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
排序方式: 共有434条查询结果,搜索用时 31 毫秒
1.
It has been revealed, that in Ir subjected to severe plastic deformation, an ultrafine grained structure (UFG) is formed (the grain size of 20-30 nm). Practically no defects have been detected within the grains, while, in the case of Ar+ implantation, the subgrain structure with characteristic sizes of about 3-5 nm is formed; defects have been detected within subgrains.The subgrain structure was also revealed in UFG Ni and Cu after severe plastic deformation (SPD) (subgrain size of 3-15 nm), but in the latter case the observed boundary region is broader and subgrain is highly disoriented. 相似文献
2.
Microstructural change of ultrafine-grained aluminum during high-speed plastic deformation 总被引:5,自引:0,他引:5
N. Tsuji T. Toyoda Y. Minamino Y. Koizumi T. Yamane M. Komatsu M. Kiritani 《Materials Science and Engineering: A》2003,350(1-2):108-116
Effect of strain rate on microstructural change in deformation of the ultrafine grained (UFG) aluminum produced by severe plastic deformation (SPD) was studied. Commercial purity 1100 aluminum sheets were highly strained up to an equivalent strain of 4.8 by the Accumulative Roll-Bonding (ARB) process at ambient temperature. The ARB-processed sheets were found to be filled with pancake-shaped ultrafine grains surrounded by high-angle grain boundaries. The ultrafine grains had a mean grain thickness of 200 nm and a mean grain length of 1100 nm. The ultrafine-grained aluminum sheets were deformed at various strain rates ranging from 2 to 6.0×104 s−1 by conventional rolling, ultra-high-speed rolling, and impact compression. High-speed plastic deformation generates a large amount of heat, inducing coarsening of the ultrafine grains during and after deformation. On the other hand, it was also suggested that high-speed plastic deformation is effective for grain-subdivision, in other words, ultra-grain refinement, if the effect of heat generation is extracted. 相似文献
3.
4.
S.V. Zherebtsov G.A. Salishchev R.M. Galeyev O.R. Valiakhmetov S.Yu. Mironov S.L. Semiatin 《Scripta materialia》2004,51(12):1147-1151
The “abc” deformation method for production of large-scale billets with submicrocrystalline structure was developed. A large billet of Ti–6Al–4V alloy (150-mm diameter × 200-mm length) with a homogeneous submicrocrystalline structure was produced. The refined structure with a grain/subgrain size of about 0.4 μm leads to a substantial mechanical properties improvement. 相似文献
5.
针对北方严寒高地下水位地区,检查井在冬季运行期间,由于地下水的渗透,经常被冰层覆盖,无法正常运行的问题,采用焊接钢板成箱式检查井,使其密封不透水,从而有效地解决了严寒高地下水位地区检查井的冻胀及结冰病害问题. 相似文献
6.
Microstructure,Phase Composition,and Thermal Stability of Two Zirconium Alloys Subjected to High‐Pressure Torsion at Different Temperatures
下载免费PDF全文
![点击此处可从《Advanced Engineering Materials》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Stanislav. O. Rogachev Sergey A. Nikulin Andrey B. Rozhnov Mikhail V. Gorshenkov 《Advanced Engineering Materials》2018,20(9)
7.
8.
9.
10.
J. H. Song I. K. Park Y. S. Shin J. H. Kim S. W. Hong B. T. Min H. D. Kim 《Nuclear Engineering and Design》2003,222(1):1051-15
This paper discusses the results of steam explosion experiments using reactor material carried out under “Test for Real cOrium Interaction with water (TROI)” program. About 4–9 kg of corium melt jet is delivered into a sub-cooled water pool at atmospheric pressure. Spontaneous steam explosions are observed in four tests among six tests. The dynamic pressure, dynamic load, and morphology of debris clearly indicate the cases with steam explosion. The initial conditions and results of the experiments are discussed. 相似文献