全文获取类型
收费全文 | 2701篇 |
免费 | 5篇 |
专业分类
电工技术 | 27篇 |
综合类 | 1篇 |
化学工业 | 165篇 |
金属工艺 | 107篇 |
机械仪表 | 73篇 |
建筑科学 | 9篇 |
矿业工程 | 11篇 |
能源动力 | 5篇 |
轻工业 | 8篇 |
水利工程 | 25篇 |
石油天然气 | 105篇 |
无线电 | 85篇 |
一般工业技术 | 278篇 |
冶金工业 | 1626篇 |
原子能技术 | 116篇 |
自动化技术 | 65篇 |
出版年
2022年 | 16篇 |
2021年 | 30篇 |
2020年 | 16篇 |
2019年 | 23篇 |
2018年 | 56篇 |
2017年 | 38篇 |
2016年 | 45篇 |
2015年 | 23篇 |
2014年 | 30篇 |
2013年 | 50篇 |
2012年 | 34篇 |
2011年 | 38篇 |
2010年 | 34篇 |
2009年 | 45篇 |
2008年 | 45篇 |
2007年 | 33篇 |
2006年 | 21篇 |
2005年 | 22篇 |
2004年 | 22篇 |
2003年 | 23篇 |
2002年 | 27篇 |
2001年 | 32篇 |
2000年 | 22篇 |
1999年 | 52篇 |
1998年 | 465篇 |
1997年 | 272篇 |
1996年 | 195篇 |
1995年 | 155篇 |
1994年 | 101篇 |
1993年 | 92篇 |
1992年 | 30篇 |
1991年 | 27篇 |
1990年 | 25篇 |
1989年 | 21篇 |
1988年 | 16篇 |
1987年 | 19篇 |
1986年 | 18篇 |
1985年 | 23篇 |
1983年 | 13篇 |
1982年 | 14篇 |
1981年 | 25篇 |
1980年 | 25篇 |
1978年 | 25篇 |
1977年 | 77篇 |
1976年 | 117篇 |
1975年 | 12篇 |
1973年 | 13篇 |
1972年 | 19篇 |
1971年 | 12篇 |
1970年 | 14篇 |
排序方式: 共有2706条查询结果,搜索用时 15 毫秒
1.
2.
Byakova O. V. Stepanov G. V. Vlasov A. O. Danylyuk V. E. Semenov N. V. Berezovs’kyi O. M. Gnyloskurenko S. V. 《Strength of Materials》2019,51(5):726-734
Strength of Materials - The paper addresses the investigation of high-strain rate compressive behavior of Al foams subjected to impact at the intermediate striking velocity ranged from 40 to... 相似文献
3.
V. N. Oparin V. I. Vostrikov O. M. Usol’tseva P. A. Tsoi V. N. Semenov 《Journal of Mining Science》2015,51(3):624-633
The authors have developed a procedure and a test bench for studying evolution of various nature physical fields in modeling geomedium fracture by fluids. The test bench performs synchronous recording of macro- and micro-deformation, heat and acoustic emission induced in physical models of geomedium under loading to discontinuity. The experimental procedure has been trialed. The analysis of the synchronized test data allows a conclusion on the existence of time–space relationship between different nature physical fields induced during failure of solids. 相似文献
4.
V.I. Popkov O.V. Almjasheva V.N. Nevedomskiy V.V. Panchuk V.G. Semenov V.V. Gusarov 《Ceramics International》2018,44(17):20906-20912
Formation and structural transformations of yttrium orthoferrite crystals have been studied using X-ray diffractometry, Mössbauer spectroscopy and transmission electron microscopy combined with electron microdiffraction. Said processes have been studied under heat treatment of glycine-nitrate combustion products. There have been identified formations of three structural yttrium orthoferrite modifications – amorphized hexagonal <h1>-YFeO3 (P63cm) and nanocrystalline hexagonal h2-YFeO3 (P63/mmc), as well as nanocrystalline orthorhombic o-YFeO3 (Pbnm), which are selectively formed depending on available three-dimensional confinements. Based on the analysis of changes in the fluid and size composition formulation, it has been proposed mechanism for formation and transformation of YFeO3 nanocrystals, including growth stage of h2-YFeO3 crystals due to amorphized phase of <h1>-YFeO3 up to critical size of about 15?nm and their subsequent transformation into orthorhombic form o-YFeO3. 相似文献
5.
Vashchenko S.V. Khudyakov A.Yu. Baiul K.V. Semenov Yu.S. 《Powder Metallurgy and Metal Ceramics》2021,60(3-4):247-256
Powder Metallurgy and Metal Ceramics - The mechanisms of phase interactions in granular media were studied to elaborate the results obtained previously at the Nekrasov Iron and Steel Institute of... 相似文献
6.
We characterize the meander of re-entrant excitation in a model of a sheet of mammalian ventricular tissue, and its control by resonant drift under feedback driven stimulation. The Oxsoft equations for excitability in a guinea pig single ventricular cell were incorporated in a two dimensional reaction-diffusion system to model homogeneous, isotropic tissue with a plane wave conduction velocity of 0.35 m s-1. Re-entrant spiral wave solutions have a spatially extended transient motion (linear core) that settles down into rotation with an irregular period of 100-110 ms around an irregular, multi-lobed spiky core. In anisotropic tissue this would appear as a linear conduction block. The typical velocity of drift of the spiral wave induced by low amplitude resonant forcing is 0.4 cm s-1. 相似文献
7.
SA Balakirev VI Tsygankin AV Ivanov VI Atroshchenko AN Ianovski? M Sarfundin 《Canadian Metallurgical Quarterly》1997,43(4):445-447
The report deals with the development of procedures, evaluation of laser application and prevention of complications involved in intensive chemoradiation therapy of neoplasms of hemopoietic and lymphoid tissue in childhood. The clinical data on 548 patients, aged 2 months-15 years, with leukemia and solid tumor were evaluated. Laser application for treatment of different complications of chemoradiation therapy of pediatric leukemia proved a valuable innovation. It had a pronounced antiinflammatory and analgetic effect, promoted tissue regeneration processes and cut down the duration of complication treatment drastically. 相似文献
8.
9.
10.
AV Pensler 《Canadian Metallurgical Quarterly》1998,19(4):387-90, 392-4, 396; quiz 398