全文获取类型
收费全文 | 23283篇 |
免费 | 370篇 |
国内免费 | 90篇 |
专业分类
电工技术 | 754篇 |
综合类 | 96篇 |
化学工业 | 3533篇 |
金属工艺 | 1315篇 |
机械仪表 | 1673篇 |
建筑科学 | 517篇 |
矿业工程 | 334篇 |
能源动力 | 226篇 |
轻工业 | 713篇 |
水利工程 | 415篇 |
石油天然气 | 861篇 |
武器工业 | 11篇 |
无线电 | 2342篇 |
一般工业技术 | 5526篇 |
冶金工业 | 2803篇 |
原子能技术 | 439篇 |
自动化技术 | 2185篇 |
出版年
2023年 | 74篇 |
2022年 | 332篇 |
2021年 | 512篇 |
2020年 | 402篇 |
2019年 | 590篇 |
2018年 | 1155篇 |
2017年 | 1195篇 |
2016年 | 1399篇 |
2015年 | 823篇 |
2014年 | 1191篇 |
2013年 | 1607篇 |
2012年 | 1439篇 |
2011年 | 1402篇 |
2010年 | 1316篇 |
2009年 | 1538篇 |
2008年 | 1407篇 |
2007年 | 1336篇 |
2006年 | 1052篇 |
2005年 | 690篇 |
2004年 | 401篇 |
2003年 | 241篇 |
2002年 | 222篇 |
2001年 | 197篇 |
2000年 | 507篇 |
1999年 | 402篇 |
1998年 | 513篇 |
1997年 | 460篇 |
1996年 | 171篇 |
1995年 | 70篇 |
1994年 | 70篇 |
1993年 | 75篇 |
1992年 | 61篇 |
1991年 | 33篇 |
1990年 | 56篇 |
1989年 | 27篇 |
1988年 | 30篇 |
1987年 | 39篇 |
1986年 | 25篇 |
1985年 | 39篇 |
1984年 | 40篇 |
1983年 | 30篇 |
1982年 | 31篇 |
1981年 | 25篇 |
1980年 | 35篇 |
1979年 | 39篇 |
1978年 | 38篇 |
1977年 | 37篇 |
1976年 | 68篇 |
1973年 | 26篇 |
1969年 | 26篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
A. M. Kut’in V. S. Polyakov M. F. Churbanov G. E. Snopatin 《Inorganic Materials》2007,43(9):1018-1023
Using a flow method, we have measured the vapor pressure of tellurium tetraiodide, an attractive reagent for chemical vapor deposition technology. The results, combined with earlier tensimetric data, have been used to evaluate the basic thermodynamic functions of TeI4 and its thermolysis products. 相似文献
12.
A. D. Pogrebnyak M. V. Il’yashenko V. S. Kshnyakin V. V. Ponaryadov Sh. M. Ruzimov Yu. N. Tyurin 《Technical Physics Letters》2003,29(12):1028-1030
Chromium carbide-nickel coatings were deposited onto a technical grade copper substrate by means of a high-velocity plasma
jet of a plasmatron operating in specially selected regimes. An analysis of the coatings showed evidence of the formation
of a Ni-based solid solution, a complex chromium carbide (Cr7C3), and an fcc crystal phase with a lattice parameter of 3.614 Å. The surface of the coatings exhibits a characteristic relief
resulting from a dynamic interaction between melted and fused particles of the initial powder. The local hardness on some
areas of the surface and in depth of the coating reaches 66±4.5 HRC, while the coating adhesion strength varies from 25 to
300 MPa. 相似文献
13.
N. N. Belov Yu. A. Biryukov A. T. Roslyak N. T. Yugov S. A. Afanas’eva 《Theoretical Foundations of Chemical Engineering》2005,39(3):307-312
A new circulation pneumatic crusher capable of producing submicron powders of refractory materials is presented. A mathematical model is constructed for the dynamic breaking of ceramic macroparticles. This model allows the basic laws of shock-wave crushing in the circulation pneumatic apparatus to be analyzed.__________Translated from Teoreticheskie Osnovy Khimicheskoi Tekhnologii, Vol. 39, No. 3, 2005, pp. 327–333.Original Russian Text Copyright © 2005 by Belov, Biryukov, Roslyak, Yugov, Afanas’ev. 相似文献
14.
I. A. Ovid’ko 《Journal of Materials Science》2007,42(5):1694-1708
An overview of experimental study, computer simulations and theoretical models of fracture of nanocrystalline materials is
presented. The key experimentally detected facts on ductile and brittle fracture processes are discussed. Special attention
is paid to computer simulations and theoretical models of nucleation and growth of nanocracks and nanopores in deformed nanocrystalline
materials. Also, we discuss mechanisms for fracture suppression in such materials showing good ductility or superplasticity. 相似文献
15.
V. N. Perevezentsev M. Yu. Shcherban’ M. Yu. Murashkin R. Z. Valiev 《Technical Physics Letters》2007,33(8):648-650
The structure and mechanical properties of nanocrystalline aluminum alloy 1570 obtained by means of severe plastic deformation have been studied. Being tested in a temperature range from 300 to 400°C, the alloy exhibits high-strain-rate superplasticity. At 400°C, the superplasticity is manifested in a very broad range of strain rates, extending from 5 × 10?3 to 1 s?1. 相似文献
16.
V. V. Mamutin O. V. Bondarenko A. P. Vasil’ev A. G. Gladyshev A. Yu. Egorov N. V. Kryzhanovskaya V. S. Mikhrin V. M. Ustinov 《Technical Physics Letters》2007,33(5):384-387
The optical properties of heterostructures comprising InAs/InGaAsN quantum wells in strain-compensated GaAsN/InGaAsN superlattices have been studied. It is demonstrated that, using such superlattices of various design and thickness and with additional InAs monolayer spacers, it is possible to control the wavelength of room-temperature emission from InGaAsN quantum wells within 1.3–1.6 μm without deteriorating the output radiation characteristics, which opens additional prospects for the development of lasers on GaAs substrates for telecommunication applications. 相似文献
17.
Ér. V. Kal’yanov 《Technical Physics Letters》2007,33(6):451-453
A new simple model of a system with chaotic dynamics, based on the equations of bistable systems, is considered. The possibility of converting harmonic signals into chaotic oscillations, which represent intermittent irregular and switching quasi-regular motions, is demonstrated by numerical methods. The mechanism of chaotization is analyzed using the results of numerical calculations. 相似文献
18.
V. Ya. Sakulin V. P. Migal’ A. P. Margishvili V. V. Bulin 《Refractories and Industrial Ceramics》2008,49(5):354-358
A range of refractories is presented for handling steel outside a furnace, which are produced by the Borovichi Refractories
Corporation. The refractory characteristics and working features are given.
Translated from Novye Ogneupory, No. 9, pp. 29–35, September, 2008. 相似文献
19.
L. M. Aksel’rod V. I. Rumyantsev N. Yu. Korableva N. V. Belykh Ya. G. Dyatlova 《Refractories and Industrial Ceramics》2008,49(2):116-119
Technology is developed for preparing refractory components made of partially stabilized zirconium dioxide using an isostatic
compaction press. Technology is provided for manufacturing dispensing nozzles using combined and separately stabilized zirconium
dioxide, and also indices of the refractories obtained and imported materials are compared.
__________
Translated from Novye Ogneupory, No. 3, pp. 127–131, March 2008. 相似文献
20.
I. D. Kashcheev S. N. Sychev M. N. Dunaeva L. A. Karpets P. A. Emel’yanov O. S. Ryakhova 《Refractories and Industrial Ceramics》2008,49(2):131-134
Compositions have been developed for nonshrinking vibrocast thermally insulating light refractory concretes with densities
of 1.0, 1.3, 1.5, and 1.8 g/cm3 for temperatures of use up to 1400°C. The structure and properties have been examined for the concrete of density 1.3 g/cm3.
__________
Translated from Novye Ogneupory, No. 4, pp. 29–32, April, 2008. 相似文献