全文获取类型
收费全文 | 164篇 |
免费 | 0篇 |
专业分类
电工技术 | 14篇 |
化学工业 | 14篇 |
金属工艺 | 2篇 |
建筑科学 | 13篇 |
轻工业 | 1篇 |
石油天然气 | 87篇 |
一般工业技术 | 10篇 |
冶金工业 | 21篇 |
原子能技术 | 1篇 |
自动化技术 | 1篇 |
出版年
2023年 | 1篇 |
2018年 | 1篇 |
2016年 | 2篇 |
2014年 | 1篇 |
2013年 | 2篇 |
2012年 | 7篇 |
2011年 | 3篇 |
2010年 | 2篇 |
2009年 | 2篇 |
2008年 | 1篇 |
2005年 | 2篇 |
2004年 | 2篇 |
2001年 | 1篇 |
2000年 | 1篇 |
1998年 | 2篇 |
1996年 | 1篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1988年 | 1篇 |
1987年 | 2篇 |
1986年 | 6篇 |
1985年 | 2篇 |
1984年 | 3篇 |
1983年 | 3篇 |
1982年 | 5篇 |
1981年 | 6篇 |
1980年 | 6篇 |
1979年 | 7篇 |
1978年 | 10篇 |
1977年 | 11篇 |
1976年 | 4篇 |
1975年 | 6篇 |
1974年 | 5篇 |
1973年 | 4篇 |
1972年 | 5篇 |
1971年 | 4篇 |
1970年 | 6篇 |
1969年 | 5篇 |
1968年 | 5篇 |
1967年 | 2篇 |
1966年 | 4篇 |
1965年 | 3篇 |
1964年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有164条查询结果,搜索用时 15 毫秒
91.
92.
A. Shekhter H. I. Aaronson M. R. Miller S. P. Ringer E. V. Pereloma 《Metallurgical and Materials Transactions A》2004,35(3):973-983
The age-hardening behavior of Fe-25.3Ni-1.7 Ti (wt pct) alloy both in undeformed specimens and in specimens cold deformed
by 10 or 20 pct prior to aging was studied. The microstructural changes during aging were observed using transmission electron
microscopy (TEM) and atom probe analysis and there were related to the mechanical properties as measured by microhardness
and shear punch testing. An excellent combination of hardness, strength, and ductility was achieved after only 5 seconds aging
at 550 °C. We propose that this rapid strengthening is due to a dislocation friction effect arising from the formation of
a fine dispersion of Ni-Ti atomic co-clusters during this short aging time. The concomitant effects of a reverse transformation
of martensite to austenite during aging and a gradual increase in both size of the clusters and distance between them contributed
to a decrease in strength after aging for 15 seconds. This decline proceeded until aging for 300 seconds and was followed
by a secondary hardening reaction toward peak hardness (at 10,800 seconds) and subsequent overaging. This secondary hardening
was associated with fine-scale precipitation of Ni3Ti and this process was accelerated by deformation prior to aging, leading to a reduction or elimination of hardness decline
after the initial cluster hardening. 相似文献
93.
94.
95.
96.
97.
The results are given of an experimental investigation of nonuniformities of velocity in the vicinity of an envelope of porous
mesh materials under conditions of laminar flow of air from that envelope. The obtained data are generalized along with the
available literature data. Techniques are planned and recommendations given for ensuring a local continuous outflow of gas
coolant to a porous surface under conditions of transpiration cooling of the wall. 相似文献
98.
99.
100.