全文获取类型
收费全文 | 1309篇 |
免费 | 3篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 21篇 |
化学工业 | 154篇 |
金属工艺 | 30篇 |
机械仪表 | 40篇 |
建筑科学 | 9篇 |
矿业工程 | 18篇 |
能源动力 | 6篇 |
轻工业 | 2篇 |
水利工程 | 32篇 |
石油天然气 | 79篇 |
无线电 | 139篇 |
一般工业技术 | 222篇 |
冶金工业 | 334篇 |
原子能技术 | 184篇 |
自动化技术 | 43篇 |
出版年
2022年 | 19篇 |
2021年 | 20篇 |
2020年 | 13篇 |
2019年 | 15篇 |
2018年 | 20篇 |
2017年 | 21篇 |
2016年 | 40篇 |
2014年 | 39篇 |
2013年 | 34篇 |
2012年 | 31篇 |
2011年 | 41篇 |
2010年 | 38篇 |
2009年 | 32篇 |
2008年 | 37篇 |
2007年 | 40篇 |
2006年 | 25篇 |
2005年 | 28篇 |
2004年 | 23篇 |
2003年 | 21篇 |
2002年 | 19篇 |
2001年 | 24篇 |
2000年 | 25篇 |
1999年 | 18篇 |
1998年 | 67篇 |
1997年 | 49篇 |
1996年 | 30篇 |
1995年 | 20篇 |
1994年 | 15篇 |
1993年 | 16篇 |
1990年 | 16篇 |
1988年 | 12篇 |
1987年 | 16篇 |
1986年 | 19篇 |
1985年 | 13篇 |
1984年 | 17篇 |
1983年 | 15篇 |
1982年 | 14篇 |
1980年 | 25篇 |
1979年 | 20篇 |
1977年 | 34篇 |
1976年 | 47篇 |
1975年 | 16篇 |
1974年 | 11篇 |
1973年 | 15篇 |
1971年 | 12篇 |
1970年 | 14篇 |
1968年 | 19篇 |
1967年 | 14篇 |
1965年 | 13篇 |
1962年 | 11篇 |
排序方式: 共有1313条查询结果,搜索用时 15 毫秒
1.
S. A. Pul’nev A. I. Pryadko A. V. Chikiryaka V. I. Nikolaev 《Technical Physics Letters》2018,44(11):992-994
The behavior of a superelastic Cu?14.2% Al?4%Ni single crystal in the case of high reversible strains under a longitudinal bending force was investigated. The effect of strain confinement along the crystal length was revealed and studied. The highest reversible strains (up to 10%) were shown to be confined within the central part of the bent crystal. 相似文献
2.
The Magnitogorsk Metallurgical Combine has conducted a study of the effect of technological factors on the hydrogen content
of chromium-nickel-molybdenum steel after vacuum degassing. It was established that the most important factor is the hydrogen
content of the steel before the degassing operation. The study also determined the effects of the circulation coefficient,
the duration of the degassing operation, and the vacuum used in the treatment.
__________
Translated from Metallurg, No. 7, pp. 68–69, July, 2006. 相似文献
3.
Yu. I. Golovin D. V. Lopatin R. K. Nikolaev A. V. Umrikhin 《Technical Physics Letters》2004,30(5):426-428
The effect of crystal orientation on the photogeneration of free charge carriers was studied for C60 single crystals in a weak magnetic field. The photoconductivity sharply depends on the orientation of magnetic field with
respect to the crystallographic directions, showing a 5–8% increase for seven axes of the C60 crystal. 相似文献
4.
A. I. Nikolaev F. D. Larichkin O. A. Nikolaeva 《Theoretical Foundations of Chemical Engineering》2008,42(5):675-679
The main rules and principles which govern the choice of new variants for chemical technology of combined processing of titanium-rare-metal raw materials are considered. The existing variants of the technology are characterized from the viewpoint of their technological, economical, and ecological efficiency and social importance for a given region. A realistic choice of a technology from a large number of available variants should take into account the entire combination of their advantages and disadvantages The implementation of a rational technological scheme will result in the creation of economically profitable and efficient domestic production satisfying the demands of Russian industry in rare-metal and titanium materials. Directions are noted in which it is expedient to continue studies on designing a rational technology of loparite concentrate or some other concentrate. 相似文献
5.
The results of the oxidation of carbon nanofibers and materials obtained on their basis are presented; these results demonstrate that the nanofibers were formed by carbon with different degrees of crystal structure ordering. The experimental data supported previous hypotheses that amorphous carbon results from the decomposition of metal carbides. The subsequent formation of spatial structures and the appearance of crystalline carbon species resulted from catalytic graphitization. It was demonstrated that sorbents can be prepared based on carbon nanofibers after pyrolytic consolidation followed by activation, and these sorbents are more effective than well-known sorbents. 相似文献
6.
Yu. P. Nikolaev 《Automation and Remote Control》2004,65(12):1904-1914
The D-decomposition of a two-dimensional plane of arbitrary coefficients of a discrete characteristic polynomial is studied. The geometry of the boundary curve is analyzed and its common properties with a linear discrete system of any order are described. Example are given. 相似文献
7.
M. V. Zagidullin V. D. Nikolaev M. I. Svistun N. A. Khvatov 《Journal of Engineering Physics and Thermophysics》2007,80(3):555-562
The results of parametric tests of a centrifugal bubble singlet-oxygen generator based on the reaction of chlorine with an
alkaline hydrogen peroxide solution have been given. The utilization of chlorine grows with bubble-layer height, whereas the
relative content of O2(1Δ) remains constant. Growth in centrifugal acceleration leads to a more efficient utilization of chlorine. A specific oxygen
output of more than 1 mmole·cm−2·sec−1 from the bubble layer for a degree of chlorine utilization of ∼95% and a singlet-oxygen yield of more than 50% has been attained.
It has been shown that a centrifugal bubble singlet-oxygen generator is an efficient energy source for an oxygen-iodine laser.
__________
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 80, No. 3, pp. 121–128, May–June, 2007. 相似文献
8.
9.
A model for one of the methods of thermal reclamation of frozen ground is proposed which allows for water flow temperature variations on the ground surface due to heat exchange between the water flow and a thawing solid. In a computation experiment, the specific features of phase transition front propagation and liquid temperature variation are studied.Institute of Physicotechnical Problems of the North, North Branch of the Russian Academy of Sciences, Yakutsk, Russia. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 64, No. 2, pp. 168–171, February, 1993. 相似文献
10.
VA Nikolaev AN Surovaia NIu Sidorova SL Grokhovski? AS Zasedatelev GV Gurski? AL Zhuze 《Canadian Metallurgical Quarterly》1993,27(1):192-210
An analogue of netropsin has been synthesized consisting of two N-propylpyrrolcarboxamide units linked covalently to a copper-chelating tripeptide Gly-Gly-L-His by means of two and three glycine residues. Binding to DNA and synthetic polynucleotides of netropsin analogue containing three glycine residues between Gly-Gly-L-His tripeptide and the N-end of netropsin analogue (His-Nt) has been studied. It is shown that this netropsin analogue chelates a copper ion with 1:1 stoichiometry, similar to a free Gly-Gly-L-His peptide. It is found that this netropsin analogue occupies 3 to 4 base pairs upon binding to poly(dA).poly(dT) and poly[d(AT)].poly[d(AT)] polymers, irrespective of whether it binds in Cu(2+)-ligated or unligated forms. Binding constants and binding site sizes have been calculated for netropsin analogue complexes with DNA, poly(dA).poly(dT) and poly[d(AT)].poly[d(AT)] polymers at the [Cu2+]/[His-Nt] ratio equal to 0 and 1.0. In the three-component system including His-Nt and Cu(2+)-His-Nt, cooperative effects are recognized which can be explained by heterodimer generation on interaction of His-Nt and Cu(2+)-His-Nt at adjacent binding sites. 相似文献