全文获取类型
收费全文 | 597篇 |
免费 | 25篇 |
国内免费 | 3篇 |
专业分类
电工技术 | 5篇 |
化学工业 | 95篇 |
金属工艺 | 39篇 |
机械仪表 | 13篇 |
建筑科学 | 14篇 |
矿业工程 | 6篇 |
能源动力 | 17篇 |
轻工业 | 23篇 |
水利工程 | 1篇 |
石油天然气 | 55篇 |
无线电 | 35篇 |
一般工业技术 | 144篇 |
冶金工业 | 33篇 |
原子能技术 | 72篇 |
自动化技术 | 73篇 |
出版年
2021年 | 30篇 |
2020年 | 6篇 |
2019年 | 18篇 |
2018年 | 20篇 |
2017年 | 9篇 |
2016年 | 20篇 |
2015年 | 15篇 |
2014年 | 28篇 |
2013年 | 30篇 |
2012年 | 36篇 |
2011年 | 33篇 |
2010年 | 22篇 |
2009年 | 22篇 |
2008年 | 26篇 |
2007年 | 25篇 |
2006年 | 21篇 |
2005年 | 17篇 |
2004年 | 11篇 |
2003年 | 17篇 |
2002年 | 16篇 |
2001年 | 5篇 |
2000年 | 7篇 |
1998年 | 9篇 |
1997年 | 6篇 |
1995年 | 4篇 |
1994年 | 4篇 |
1993年 | 6篇 |
1992年 | 6篇 |
1990年 | 3篇 |
1989年 | 8篇 |
1988年 | 7篇 |
1987年 | 6篇 |
1986年 | 3篇 |
1984年 | 5篇 |
1983年 | 9篇 |
1982年 | 7篇 |
1981年 | 4篇 |
1977年 | 7篇 |
1976年 | 9篇 |
1975年 | 8篇 |
1974年 | 12篇 |
1973年 | 4篇 |
1972年 | 7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 |
排序方式: 共有625条查询结果,搜索用时 15 毫秒
1.
Theoretical Foundations of Chemical Engineering - The main approaches to developing a reactor block for the hydrodesulfurization of diesel fuels are considered taking into account the reactivity of... 相似文献
2.
3.
Tomi Gominek Andrej Lubej Ciril Pohar 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2005,80(8):939-947
Precipitation of calcium sulfate dihydrate, gypsum, from (i) a pure sulfuric acid/lime suspension and (ii) a waste sulfuric acid/lime suspension in a continuous pilot plant in the temperature range from 40 °C to 80 °C was studied. It was observed that in the case of waste sulfuric acid with a high content of Mg2+ and Fe2+ ions, several hours after the beginning of the precipitation, partial dissolution of the product and modification of the crystals from needle‐ and plate‐like to agglomerated structures occurred. It is suggested that the secondary changes occur due to the increased concentration of Mg2+ and Fe2+ ions in the reactor. Below 60 °C, and above 70 °C plate‐like and needle‐like single crystals respectively were formed. The mean size (d50) of the crystals was found to increase with increasing temperature and decrease with the initial concentration of lime. Gypsum produced between 70 °C and 80 °C is suitable for further processing for construction plaster. In a precipitation process with pure sulfuric acid only single perfect needle‐like crystals occurred. Copyright © 2005 Society of Chemical Industry 相似文献
4.
V. M. Samoilov 《Inorganic Materials》2004,40(12):1271-1275
The effect of the nature of two-component fillers on the physical and mechanical properties of finegrained graphites was studied using highly oriented needle coke and nearly isotropic synthetic graphite as components of fillers. Each filler was prepared in the form of coarse (-120 µm) and fine (-10 µm) powders. Different mixtures of these components were used in producing graphite samples, which were then characterized by density, thermal expansion, compressive strength, and modulus of elasticity measurements. The results demonstrate that the thermal expansion, compressive strength, and modulus of elasticity of the graphites thus prepared depend on the microtexture, size, and shape of the filler particles.Translated from Neorganicheskie Materialy, Vol. 40, No. 12, 2004, pp. 1448–1454.Original Russian Text Copyright © 2004 by Samoilov. 相似文献
5.
6.
V. S. -Kh. Kim V. A. Samoilov E. M. Sherysheva Chen Yun 《Chemical and Petroleum Engineering》1993,29(8):355-358
Translated from Khimicheskoe i Neftyanoe Mashinostroenie, No. 8, pp. 9–11, August, 1993. 相似文献
7.
8.
N. A. Samoilov 《Chemical and Petroleum Engineering》2002,38(7-8):437-443
9.
M. S. Avilov A. V. Akimov A. V. Antoshin P. A. Bak Yu. M. Boimel'shtein D. Yu. Bolkhovityanov R. Kh. Galimov R. G. Gromov K. V. Gubin S. M. Gurov E. A. Gusev N. S. Dikanskii I. V. Kazarezov S. N. Klyushchev V. I. Kokoulin E. S. Konstantinov A. A. Korepanov N. Kh. Kot R. M. Lapik N. N. Lebedev A. I. Lobas P. V. Logachev P. V. Martyshkin L. A. Mironenko V. M. Pavlov I. L. Pivovarov O. V. Pirogov V. V. Podlevskikh S. L. Samoilov Yu. I. Semenov B. A. Skarbo A. A. Starostenko O. Yu. Tokarev A. R. Frolov V. D. Khambikov A. S. Tsyganov A. G. Chupyra S. V. Shiyankov 《Atomic Energy》2003,94(1):50-55
The VÉPP-5 injection complex under construction at the Institute of Nuclear Physics of the Siberian Branch of the Russian Academy of Sciences is a powerful source of intense electron and positron bunches at 510 MeV, which covers all needs of the electron–positron colliding beam setups currently operating and under construction at the Institute of Nuclear Physics. The complex includes a 285 MeV linear electron accelerator, a 510 MeV linear positron accelerator, and an accumulator–cooler with beam injection and ejection channels. Intense work on the design, assembly, and tuning of the linear electron accelerator has been conducted in the last 2 yr. As a result, by August 2002 the linear electron accelerator was put into operation with all standard subsystems. By this time, the isochronous achromatic turning of the electron beam, a system for converting electrons into positrons, and the first accelerating structure of the linear positron accelerator were assembled and put into operation. All this made it possible to accelerate the positron beam up to 75 MeV. Preliminary results of tests of the linear accelerators are presented. 相似文献
10.
Fast Recognition of Fibonacci Cubes 总被引:1,自引:0,他引:1
Fibonacci cubes are induced subgraphs of hypercubes based on Fibonacci strings. They were introduced to represent interconnection
networks as an alternative to the hypercube networks. We derive a characterization of Fibonacci cubes founded on the concept
of resonance graphs. The characterization is the basis for an algorithm which recognizes these graphs in O(mlog n) time.
A. Vesel supported by the Ministry of Science of Slovenia under the grant 0101-P-297. 相似文献