全文获取类型
收费全文 | 275篇 |
免费 | 1篇 |
专业分类
电工技术 | 3篇 |
化学工业 | 23篇 |
金属工艺 | 11篇 |
机械仪表 | 4篇 |
建筑科学 | 5篇 |
矿业工程 | 6篇 |
石油天然气 | 54篇 |
无线电 | 2篇 |
一般工业技术 | 75篇 |
冶金工业 | 25篇 |
原子能技术 | 62篇 |
自动化技术 | 6篇 |
出版年
2021年 | 6篇 |
2018年 | 7篇 |
2016年 | 8篇 |
2014年 | 7篇 |
2013年 | 3篇 |
2012年 | 4篇 |
2011年 | 8篇 |
2010年 | 5篇 |
2008年 | 10篇 |
2007年 | 11篇 |
2006年 | 4篇 |
2005年 | 8篇 |
2004年 | 6篇 |
2003年 | 7篇 |
2002年 | 9篇 |
2001年 | 4篇 |
2000年 | 5篇 |
1998年 | 3篇 |
1997年 | 6篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 3篇 |
1989年 | 7篇 |
1988年 | 6篇 |
1987年 | 5篇 |
1986年 | 3篇 |
1984年 | 5篇 |
1983年 | 9篇 |
1982年 | 6篇 |
1981年 | 4篇 |
1978年 | 2篇 |
1977年 | 7篇 |
1976年 | 8篇 |
1975年 | 8篇 |
1974年 | 12篇 |
1973年 | 4篇 |
1972年 | 5篇 |
1971年 | 3篇 |
1970年 | 5篇 |
1969年 | 4篇 |
1967年 | 3篇 |
1966年 | 7篇 |
1965年 | 3篇 |
1964年 | 5篇 |
1961年 | 2篇 |
1959年 | 2篇 |
1958年 | 2篇 |
排序方式: 共有276条查询结果,搜索用时 0 毫秒
41.
42.
43.
44.
45.
46.
47.
The extent and degree of dispersion of carbonitrides in high strength low alloy (HSLA) steels is controlled by nucleation and growth processes. A thermodynamic model is presented enabling calculation of the composition of the carbonitride embryo as well as the chemical driving force for nucleation (CDF) in the austenite region of a multicomponent microalloyed steel. The analysis made for a Nb-Ti HSLA steel indicates that the critical carbonitride nucleus is richer in N and Ti than the bulk precipitate at equilibrium at a given temperature and the difference increases when the holding temperature decreases. The results also show that the Ti addition has an optimum value defined by the maximum in the ratio of bound Ti and Nb to their total content. The maximum CDF correlated with the minimum Ti content sufficient to form a carbonitride at the austenitizing temperature. 相似文献
48.
Calculation of an interruption arc current and time of arc quenching in low-voltage current breakers
V. P. Meshcheryakov R. T. Sibatov V. V. Samoilov A. S. Topchii 《Russian Electrical Engineering》2008,79(2):92-98
For the analytical calculation of an arc current in the process of arc quenching, an average statistical curve of a change of an interruption arc voltage is constructed and mathematically described. This curve is based on experimental data obtained during short-circuit current interruption by nonspeed and selective circuit breakers of different design, in particular, with different volumes of arc chutes. Features of short-circuit current interruption in a three-phase system are considered. 相似文献
49.
Samoilov V. I. Onalbaeva Zh. S. Adylkanova M. A. Kokaeva G. A. Abdulina S. A. 《Metallurgist》2018,62(3-4):361-368
Metallurgist - Experimental research is conducted for recovery of lithium from lepidolite. A method is developed for alkaline decomposition of lepidolite based on melting with calcined soda and... 相似文献
50.
A. I. Orlova S. G. Samoilov G. N. Kazantsev V. Yu. Volgutov A. Yu. Kazakova 《Radiochemistry》2010,52(6):666-669
Erbium zirconium phosphate Er0.33Zr2(PO4)3, a member of the family of structural analogs of NaZr2(PO4)3 (NZP), was prepared by the sol-gel process and studied by X-ray phase analysis, IR spectroscopy, and differential scanning
calorimetry. The behavior of erbium zirconium phosphate on heating in the temperature interval from 25 to 625°C was studied
by high-temperature X-ray diffraction. Expansion and contraction along different crystallographic directions and contraction
of the structure as a whole were found. The overall contraction is due to higher contribution of the negative axial thermal
expansion coefficients α
a
and α
b
to αav and hence to the volume expansion of the phosphate. On heating to 900°C, the NZP structure is preserved. 相似文献