全文获取类型
收费全文 | 1573篇 |
免费 | 6篇 |
专业分类
电工技术 | 20篇 |
综合类 | 1篇 |
化学工业 | 298篇 |
金属工艺 | 52篇 |
机械仪表 | 56篇 |
建筑科学 | 42篇 |
矿业工程 | 27篇 |
能源动力 | 10篇 |
轻工业 | 5篇 |
水利工程 | 42篇 |
石油天然气 | 124篇 |
无线电 | 110篇 |
一般工业技术 | 533篇 |
冶金工业 | 150篇 |
原子能技术 | 86篇 |
自动化技术 | 23篇 |
出版年
2022年 | 17篇 |
2021年 | 24篇 |
2019年 | 19篇 |
2018年 | 39篇 |
2017年 | 66篇 |
2016年 | 58篇 |
2015年 | 20篇 |
2014年 | 38篇 |
2013年 | 64篇 |
2012年 | 44篇 |
2011年 | 51篇 |
2010年 | 49篇 |
2009年 | 56篇 |
2008年 | 52篇 |
2007年 | 42篇 |
2006年 | 40篇 |
2005年 | 36篇 |
2004年 | 27篇 |
2003年 | 43篇 |
2002年 | 29篇 |
2001年 | 23篇 |
2000年 | 25篇 |
1999年 | 19篇 |
1998年 | 32篇 |
1997年 | 19篇 |
1996年 | 22篇 |
1992年 | 14篇 |
1991年 | 19篇 |
1990年 | 17篇 |
1989年 | 18篇 |
1988年 | 16篇 |
1987年 | 26篇 |
1986年 | 19篇 |
1985年 | 16篇 |
1984年 | 18篇 |
1983年 | 15篇 |
1982年 | 18篇 |
1981年 | 17篇 |
1979年 | 24篇 |
1978年 | 34篇 |
1977年 | 26篇 |
1976年 | 37篇 |
1975年 | 20篇 |
1974年 | 17篇 |
1973年 | 22篇 |
1972年 | 30篇 |
1971年 | 22篇 |
1970年 | 19篇 |
1968年 | 15篇 |
1965年 | 16篇 |
排序方式: 共有1579条查询结果,搜索用时 15 毫秒
101.
The thermal conductivity of single crystals of the Ca0.99Co0.01F2, Ca0.97Co0.03F2, Sr0.99Mn0.01F2, Sr0.989Mn0.01Co0.001F2, and Sr0.995Co0.005F2 solid solutions has been measured in the temperature range 50–300 K. The results demonstrate that doping of CaF2 and SrF2 crystals with small amounts of isovalent transition metal impurities is accompanied by a significant reduction in thermal conductivity. 相似文献
102.
K. S. Elkin N. I. Fedorov V. S. Sporykhin A. E. Cherevko V. M. Strakhov I. V. Surovtseva 《Coke and Chemistry》2009,52(11):487-491
The industrial use of low-ash petroleum coke instead of coke nuts in ferrosilicon production is considered. The quality and
behavior of the petroleum coke in high-temperature smelting are studied. The use of petroleum coke in smelting ferrosilicon
proves efficient. 相似文献
103.
104.
105.
106.
107.
Electrical properties and mechanism of electrical conductivity of ruthenium dioxide-base thick films
V. G. Grebenkina D. E. Dyshel M. D. Smolin V. N. Fedorov 《Powder Metallurgy and Metal Ceramics》1990,29(5):396-399
Translated from Poroshkovaya Metallurgiya, No. 5(329), pp. 68–71, May, 1990. 相似文献
108.
Combined heat transfer and evaporation dynamics are analyzed during drying of a continuously moving, porous strip which is in direct contact with a heated plate. A transient, quasi-two-dimensional model of conjugate heat transfer between a hot massive externally /internally heated plate and wet porous strip moving along the plate is developed by accounting for evaporation dynamics. The model consists of four conjugate energy conservation equations with proper boundary/interface conditions which describe the heat transfer in four distinct zones (1-electrically or indirectly heated massive metal plate, 2-thin superheated vapor film resulting from vaporization of water in the porous strip that separates hot plate and porous strip, 3-dry region of the porous strip, and 4-wet region of the porous strip). The relevant dimensiouless parameters governing the problem are identified, and results of parametric calculations are reported to gain fundamental understanding of the process. 相似文献
109.
B. D. Rogozkin N. M. Stepennova Yu. E. Fedorov M. G. Shishkov E. M. Glagovskii V. Yu. Rogozhkin L. I. Shibarshov 《Atomic Energy》2011,109(4):266-273
Experimental results of investigations of pyrochemical conversion of weapons plutonium into plutonium oxide for fabricating
fast-reactor fuel are presented. Weapons plutonium was hydrogenized by hydrogen at 220°C, after which the plutonium hydride
obtained was acidified at 550–560°C with the formation of PuO2. To increase fire and explosion safety of the process, a mixture of oxygen with nitrogen, helium, or argon was used or nitriding
with nitrogen and oxidation of plutonium mononitride were introduced. The particle size of the plutonium oxide powders obtained
was less than 15 μm. The powders showed poor flowability, but after granulation they were suitable for fabricating kernels
with mixed fuel. The gallium was removed by reduction of Ga2O3 by hydrogen to Ga2O, which was sublimated. The mixed-fuel kernels sintered at 1600–1700°C in a hydrogen atmosphere contained <0.001 wt.% gallium,
and their density was 94–97% of the theoretical value. 相似文献
110.
Russian Engineering Research - 相似文献