全文获取类型
收费全文 | 691篇 |
免费 | 3篇 |
国内免费 | 3篇 |
学科分类
工业技术 | 697篇 |
出版年
2022年 | 18篇 |
2021年 | 28篇 |
2020年 | 15篇 |
2019年 | 13篇 |
2018年 | 15篇 |
2017年 | 24篇 |
2016年 | 32篇 |
2015年 | 8篇 |
2014年 | 17篇 |
2013年 | 24篇 |
2012年 | 21篇 |
2011年 | 27篇 |
2010年 | 20篇 |
2009年 | 18篇 |
2008年 | 24篇 |
2007年 | 33篇 |
2006年 | 19篇 |
2005年 | 13篇 |
2004年 | 17篇 |
2003年 | 13篇 |
2002年 | 11篇 |
2000年 | 15篇 |
1999年 | 8篇 |
1998年 | 13篇 |
1997年 | 12篇 |
1996年 | 13篇 |
1995年 | 6篇 |
1993年 | 11篇 |
1992年 | 6篇 |
1991年 | 7篇 |
1990年 | 8篇 |
1989年 | 7篇 |
1987年 | 10篇 |
1986年 | 9篇 |
1985年 | 7篇 |
1983年 | 7篇 |
1981年 | 6篇 |
1980年 | 6篇 |
1979年 | 7篇 |
1978年 | 8篇 |
1977年 | 8篇 |
1976年 | 17篇 |
1975年 | 6篇 |
1974年 | 6篇 |
1972年 | 5篇 |
1971年 | 7篇 |
1970年 | 10篇 |
1969年 | 9篇 |
1967年 | 6篇 |
1966年 | 6篇 |
排序方式: 共有697条查询结果,搜索用时 0 毫秒
681.
Petrova D. A. Gushchin P. A. Ivanov E. V. Lyubimenko V. A. Kolesnikov I. M. 《Chemistry and Technology of Fuels and Oils》2021,57(1):143-159
Chemistry and Technology of Fuels and Oils - Naphtha reforming is one of the most important industrial processes in refineries. The products include aromatic hydrocarbons such as benzene, toluene,... 相似文献
682.
Baranovskaya V. B. Karpov Yu. A. Petrova K. V. Korotkova N. A. 《Russian Journal of Non-Ferrous Metals》2021,62(1):10-31
Russian Journal of Non-Ferrous Metals - Current trends in the application of rare-earth metals (REMs) in two major scientific and technological fields—the production of magnetic and... 相似文献
683.
Sorokin A. E. Petrova G. N. Donskikh I. N. 《Theoretical Foundations of Chemical Engineering》2020,54(5):1061-1067
Theoretical Foundations of Chemical Engineering - In this review, the key methods used in the chemical and electrochemical functionalization of carbon fiber and fiberglass are considered. It is... 相似文献
684.
I. V. Gadolina D. A. Dubin I. M. Petrova I. L. Serebriakova 《Journal of Machinery Manufacture and Reliability》2020,49(1):31-37
For a reasonable and reliable assessment of durability at the design or operation stage of the tracked vehicles, it is required information about the loading process. For a reliable assessment of loading and, consequently, durability, the question arises about the representative length of the loading process recording. The paper proposes a method for determining the necessary and sufficient realization length. The efficiency of the proposed method is demonstrated by the example of the evaluation of the random loading processes in torsion shafts of the suspension systems of a high-speed tracked vehicle. The justification of the necessary and sufficient length of the record of the random loading process is given. 相似文献
685.
Composite coatings, based on nickel or cobalt matrix with incorporated boron nitride particles (BN) as dispersoid, have been chemically deposited and investigated. The mass, and relative thicknesses, of the obtained composite coatings, as well as the number of co-deposited particles, depending on the type (alpha boron nitride – BN(h) or cubic boron nitride – BN(c)) and particle size of the dispersoid, as a function of dispersoid concentration in the working electrolyte and the concentration of the reducing agent in the plating electrolyte have been determined. The morphology, structure and chemical composition of the deposited coatings have been characterised by means of SEM and EDS analysis. 相似文献
686.
Kalygina V. M. Zarubin A. N. Nayden Ye. P. Novikov V. A. Petrova Y. S. Tolbanov O. P. Tyazhev A. V. Yaskevich T. M. 《Semiconductors》2011,45(8):1097-1102
The effect of oxygen plasma on gallium oxide films formed by electrochemical oxidation of n-GaAs wafers with a donor concentration N
d
= (1–2) × 1016 cm−3 has been investigated. It is shown that the treatment in an oxygen plasma at a temperature of 50–90°C increases the concentration
of β-phase crystallites, which causes an increase in the permittivity, a decrease in the dielectric dissipation factor, and
a change in the conductivity of GaAs-〈gallium oxide〉-metal structures. 相似文献
687.
It was demonstrated that the ratios between the fractions of carbon and hydrogen in CH3, CH2, and CH groups regularly changed in the coal metamorphism series. 相似文献
688.
Notker R?sch Galina P. Petrova Petko St. Petkov Alexander Genest Sven Kr��ger Hristiyan A. Aleksandrov Georgi N. Vayssilov 《Topics in Catalysis》2011,54(5-7):363-377
We review our computational studies at the DFT level on small isolated metal clusters of late transition metals that contain atomic (H, C, O) or diatomic (CO, N2) ligands. These investigations were initiated by the clarification of the structure of iridium and rhodium clusters, as characterized by EXAFS, and then were extended to clusters of other transition metals (Ni, Ru, Pd, Os, Pt). The results suggest that a single H atom hardly changes the structure of a small metal cluster, while the presence of O and C impurity atoms causes large variations in the metal?Cmetal distances. The adsorption of single atoms results in a partial oxidation of the metal moiety, yet addition of an atomic impurity only moderately modifies the electronic properties of small clusters, whereas stronger modifications of the properties are caused when the charge of the metal cluster is varied. The dissociative adsorption of larger amounts of hydrogen, up to 6 H2 molecules, on metal tetramers causes an elongation of the (average) inter-metallic distances, bringing them close to the experimental values. This body of computational results can be helpful for elucidating the structures of experimentally observed species and for rationalizing their electronic and catalytic properties. 相似文献
689.
A. D. Pomogailo A. S. Burlov N. D. Golubeva L. A. Petrova S. A. Mashchenko S. I. Pomogailo G. I. Dzhardimalieva A. D. Garnovskii 《Inorganic Materials》2011,47(8):876-883
We demonstrate that nanocomposites (metals and metal carbides and sulfides) can be produced by thermolysis (370 and 600°C)
in a self-generated atmosphere using Cu(II), Co(II), and Ni(II) 2-hydroxy- and 2-N-tosylaminobenzaldehyde azomethine bis-chelates
as precursors. 相似文献
690.
Petrova M. O. Bulavin M. V. Rogov A. D. Yskakov A. Galushko A. V. 《Instruments and Experimental Techniques》2022,65(3):371-375
Instruments and Experimental Techniques - The current characteristics of the ionizing radiation fields of an irradiation facility intended for studying the radiation resistance of materials on... 相似文献