全文获取类型
收费全文 | 3111篇 |
免费 | 51篇 |
国内免费 | 5篇 |
专业分类
电工技术 | 59篇 |
化学工业 | 564篇 |
金属工艺 | 243篇 |
机械仪表 | 163篇 |
建筑科学 | 19篇 |
矿业工程 | 119篇 |
能源动力 | 81篇 |
轻工业 | 23篇 |
水利工程 | 64篇 |
石油天然气 | 175篇 |
无线电 | 210篇 |
一般工业技术 | 746篇 |
冶金工业 | 316篇 |
原子能技术 | 211篇 |
自动化技术 | 174篇 |
出版年
2022年 | 30篇 |
2021年 | 72篇 |
2020年 | 54篇 |
2019年 | 56篇 |
2018年 | 100篇 |
2017年 | 130篇 |
2016年 | 126篇 |
2015年 | 66篇 |
2014年 | 92篇 |
2013年 | 98篇 |
2012年 | 111篇 |
2011年 | 138篇 |
2010年 | 124篇 |
2009年 | 106篇 |
2008年 | 104篇 |
2007年 | 100篇 |
2006年 | 77篇 |
2005年 | 58篇 |
2004年 | 47篇 |
2003年 | 58篇 |
2002年 | 52篇 |
2001年 | 58篇 |
2000年 | 53篇 |
1999年 | 41篇 |
1998年 | 53篇 |
1997年 | 52篇 |
1996年 | 31篇 |
1995年 | 30篇 |
1994年 | 30篇 |
1990年 | 30篇 |
1988年 | 34篇 |
1986年 | 42篇 |
1985年 | 28篇 |
1984年 | 36篇 |
1983年 | 47篇 |
1982年 | 30篇 |
1981年 | 39篇 |
1980年 | 37篇 |
1979年 | 35篇 |
1978年 | 39篇 |
1977年 | 42篇 |
1976年 | 50篇 |
1975年 | 44篇 |
1974年 | 46篇 |
1973年 | 40篇 |
1972年 | 37篇 |
1971年 | 36篇 |
1970年 | 30篇 |
1969年 | 29篇 |
1968年 | 33篇 |
排序方式: 共有3167条查询结果,搜索用时 234 毫秒
1.
Kuznetsov Yu. A. Markov M. A. Kravchenko I. N. Krasikov A. V. Bykova A. D. 《Refractories and Industrial Ceramics》2021,62(4):421-425
Refractories and Industrial Ceramics - The paper introduces a promising technology for utilizing a traditional scheme for implementing a flow-through micro-arc oxidation method to restore localized... 相似文献
2.
J. Grune K. Sempert M. Kuznetsov T. Jordan 《International Journal of Hydrogen Energy》2021,46(23):12487-12496
This paper presents results of experimental investigations on spherical and cylindrical flame propagation in pre-mixed H2/air-mixtures in unconfined and semi-confined geometries. The experiments were performed in a facility consisting of two transparent solid walls with 1 m2 area and four weak side walls made from thin plastic film. The gap size between the solid walls was varied stepwise from thin layer geometry (6 mm) to cube geometry (1 m). A wide range of H2/air-mixtures with volumetric hydrogen concentrations from 10% to 45% H2 was ignited between the transparent solid walls. The propagating flame front and its structure was observed with a large scale high speed shadow system. Results of spherical and cylindrical flame propagation up to a radius of 0.5 m were analyzed. The presented spherical burning velocity model is used to discuss the self-acceleration phenomena in unconfined and unobstructed pre-mixed H2/air flames. 相似文献
3.
N. Yu. Kuznetsov 《Cybernetics and Systems Analysis》1994,30(3):419-439
Published in Kibernetika i Sistemnyi Analiz, No. 3, pp. 128–150, May–June, 1994. 相似文献
4.
5.
L. I. Ochertyanova V. N. Mustyatsa K. Yu. Zhizhin O. N. Belousova N. T. Kuznetsov 《Inorganic Materials》2004,40(2):144-146
The compounds MB10H11 (M = Me4N+, Et4N+, Bu4N+, Ph4P+, Ph4As+) are synthesized. A procedure is proposed for boron determination by atomic absorption spectrophotometry, using microwave processing for sample preparation. 相似文献
6.
N. V. Vostokov Yu. N. Drozdov Z. F. Krasil’nik O. A. Kuznetsov A. V. Novikov V. A. Perevoshchikov M. V. Shaleev 《Russian Microelectronics》2005,34(4):203-209
The results are presented of the fabrication of strain-relaxed graded Si1 − x
Gex/Si(001) buffer layers with a maximum Ge fraction of about 0.25 that have a low density of threading dislocations (<106 cm−2) and low surface roughness. The buffer layers are grown by atmospheric-pressure hydride CVD. It is found that chemical mechanical polishing can reduce their surface roughness to a level comparable with that of the original Si(001) substrates. It is shown that the polished buffer layers can serve as substrates for MBE-grown SiGe/Si heterostructures.__________Translated from Mikroelektronika, Vol. 34, No. 4, 2005, pp. 243–250.Original Russian Text Copyright © 2005 by Vostokov, Drozdov, Krasil’nik, Kuznetsov, Novikov, Perevoshchikov, Shaleev. 相似文献
7.
V. V. Ustinov A. B. Rinkevich L. N. Romashev E. A. Kuznetsov 《Technical Physics Letters》2007,33(9):771-774
The reflection of electromagnetic waves in the millimeter wave band from Fe/Cr nanostructures has been studied. It is established that the giant magnetoresistance (GMR) in the nanostructure leads to an increase in the reflection and a decrease in the transmission of microwaves, while the magnetic resonance leads to a decrease in both the reflection and transmission coefficients. 相似文献
8.
Type testing for fault currents for medium-voltage circuit breakers rated at 15 kV to 72.5 kV is addressed. The ANSI designation of a new class of definite-purpose circuit breakers capable of switching transformer secondary faults and the introduction of the requirement for short-line-fault tests for breakers rated 72.5 kV and below have increased the difficulty of performing type tests in a testing laboratory. It is concluded that synthetic testing using the parallel current injection circuit is described in ANSI C37.081 provides the best available method for proving these complex requirements for medium-voltage circuit breakers 相似文献
9.
A.V. Okotrub L.G. Bulusheva I.S. Larionova V.L. Kuznetsov S.L. Molodtsov 《Diamond and Related Materials》2007,16(12):2090-2092
X-ray absorption spectroscopy has been used for comparative study of electronic structure of detonation nanodiamonds (ND) purified using different oxidative treatments. The treatment of detonation soot with a mixture of nitric and sulphuric acids followed by ion exchange and ultrafiltration of hydrosol obtained was found to result in developing of ND surface coverage consisting of oxidized carbon species, which electronic state is close to that of strongly oxidized graphite. The deeper purification of ND was demonstrated to allow cleaning of ND particles from most of the oxidized carbon contaminations. 相似文献
10.