全文获取类型
收费全文 | 168518篇 |
免费 | 1169篇 |
国内免费 | 193篇 |
专业分类
电工技术 | 2553篇 |
综合类 | 119篇 |
化学工业 | 26611篇 |
金属工艺 | 9471篇 |
机械仪表 | 5715篇 |
建筑科学 | 3008篇 |
矿业工程 | 1887篇 |
能源动力 | 2703篇 |
轻工业 | 8816篇 |
水利工程 | 2729篇 |
石油天然气 | 8692篇 |
武器工业 | 12篇 |
无线电 | 14492篇 |
一般工业技术 | 38250篇 |
冶金工业 | 27794篇 |
原子能技术 | 6933篇 |
自动化技术 | 10095篇 |
出版年
2018年 | 2978篇 |
2017年 | 3091篇 |
2016年 | 3344篇 |
2015年 | 1672篇 |
2014年 | 2954篇 |
2013年 | 6338篇 |
2012年 | 4311篇 |
2011年 | 5397篇 |
2010年 | 4420篇 |
2009年 | 4894篇 |
2008年 | 4940篇 |
2007年 | 4868篇 |
2006年 | 4141篇 |
2005年 | 3819篇 |
2004年 | 3634篇 |
2003年 | 3520篇 |
2002年 | 3450篇 |
2001年 | 3463篇 |
2000年 | 3361篇 |
1999年 | 3212篇 |
1998年 | 7018篇 |
1997年 | 5148篇 |
1996年 | 3821篇 |
1995年 | 2916篇 |
1994年 | 2593篇 |
1993年 | 2720篇 |
1992年 | 2254篇 |
1991年 | 2304篇 |
1990年 | 2409篇 |
1989年 | 2315篇 |
1988年 | 2313篇 |
1987年 | 2190篇 |
1986年 | 2246篇 |
1985年 | 2292篇 |
1984年 | 2206篇 |
1983年 | 2135篇 |
1982年 | 1980篇 |
1981年 | 2193篇 |
1980年 | 2053篇 |
1979年 | 2269篇 |
1978年 | 2431篇 |
1977年 | 2430篇 |
1976年 | 3095篇 |
1975年 | 2244篇 |
1974年 | 2307篇 |
1973年 | 2342篇 |
1972年 | 2155篇 |
1971年 | 1911篇 |
1970年 | 1701篇 |
1969年 | 1632篇 |
排序方式: 共有10000条查询结果,搜索用时 117 毫秒
991.
Investigation of the characteristics of thermionic converters with a Mo (110) single-crystal collector with Ion-implanted oxygen 总被引:1,自引:0,他引:1
S. S. Gerashchenko M. I. Guseva V. A. Koryukin V. Z. Kaibyshev V. P. Obrezumov Yu. V. Taldonov 《Atomic Energy》1994,76(2):147-149
Institute of Nuclear Reactors, Russian Scientific Center "Kurchatovskii Institut." Translated from Atomnaya énergiya, Vol.
76, No. 2, pp. 151–152, February, 1994. 相似文献
992.
N. B. Borisov L. I. Borisova B. I. Bylkin S. V. Tsvetkov G. V. Momot A. A. Khrulev 《Atomic Energy》1994,76(2):144-146
Scientific-Research Physical Chemistry Institute. All-Union Scientific-Research Institute of Automatic Machinery. Institute
of Nuclear Reactors, Russian Scientific Center "Kurchatovskii institut." Translated from Atomnaya énergiya, Vol. 76, No. 2,
pp. 148–151, February, 1994. 相似文献
993.
Moscow Scientific and Industrial Association "Radon." Translated from Atomnaya énergiya, Vol. 77, No. 2, pp. 129–134, August,
1994. 相似文献
994.
S. E. Borisov A. V. Kudryavtseva A. V. Leshchenko M. A. Luk'yanov V. P. Mashkovich M. N. Morev V. A. Neretin V. I. Tsofin 《Atomic Energy》1994,77(4):802-807
Moscow Engineering Physics Institute, MGSU, and Special Design Office "Gidropress". Translated from Atomnaya énergiya, Vol.
77, No. 4, pp. 314–318, October, 1994. 相似文献
995.
This chapter focuses on multielectron reactions in organized assemblies of molecules at the liquid/liquid interface. We describe the thermodynamic and kinetic parameters of such reactions, including the structure of the reaction centers, charge movement along the electron transfer pathways, and the role of electric double layers in artificial photosynthesis. Some examples of artificial photosynthesis at the oil/water interface are considered, including water photooxidation to the molecular oxygen, oxygen photoreduction, photosynthesis of amphiphilic compounds and proton evolution by photochemical processes. 相似文献
996.
Summary The solution behaviour of the polycarboxylic acid derived from scleroglucan (sclerox) has been investigated as a function of NaOH concentration and temperature by means of polarimetry and viscosimetry techniques. In comparison to the native polymer, sclerox is less sensitive to degradation at high NaOH concentration (up to NaOH equal to 0.4 M) and thermally more stable. The viscosity data show a normal polyelectrolyte effect and the polymer chains seem to be not stiff. We conclude that at high pH sclerox chains are in a flexible, probably single stranded conformation. 相似文献
997.
Ilev IK 《Applied optics》1995,34(10):1741-1743
A simple autocollimation scheme for a laser refractometer with a highly sensitive, single-mode, fiber-optic output is described. It allows for the determination of the refractive index and dispersion of optical materials with an accuracy exceeding 10(-5), which is confirmed by both experimental and analytical investigations. 相似文献
998.
999.
A digital phase-mapping method has been developed for application in real-time electronic speckle interferometry studies. Its principles and application to a continuously deforming object are described. An efficient digital image-processing algorithm has been developed that permits quantitative interpretation of the resulting phase maps. 相似文献
1000.
We describe one of the possible designs for the UV-visible spectrograph optics to be employed in the ODIN project. The spectrograph will be used in a future satellite mission for aeronomy observations and will image a column of atmosphere just above the Earth's surface onto a two-dimensional CCD array with the spatial and spectral content aligned orthogonal to one another. 相似文献