全文获取类型
收费全文 | 653828篇 |
免费 | 6196篇 |
国内免费 | 1757篇 |
专业分类
化学 | 332912篇 |
晶体学 | 9656篇 |
力学 | 32343篇 |
综合类 | 22篇 |
数学 | 85437篇 |
物理学 | 201411篇 |
出版年
2021年 | 5807篇 |
2020年 | 6360篇 |
2019年 | 7196篇 |
2018年 | 9591篇 |
2017年 | 9676篇 |
2016年 | 13551篇 |
2015年 | 7589篇 |
2014年 | 12443篇 |
2013年 | 29258篇 |
2012年 | 22663篇 |
2011年 | 27080篇 |
2010年 | 19852篇 |
2009年 | 19643篇 |
2008年 | 25385篇 |
2007年 | 25346篇 |
2006年 | 23218篇 |
2005年 | 20804篇 |
2004年 | 19438篇 |
2003年 | 17481篇 |
2002年 | 17220篇 |
2001年 | 18477篇 |
2000年 | 14385篇 |
1999年 | 11136篇 |
1998年 | 9513篇 |
1997年 | 9369篇 |
1996年 | 8769篇 |
1995年 | 7976篇 |
1994年 | 7854篇 |
1993年 | 7588篇 |
1992年 | 8151篇 |
1991年 | 8571篇 |
1990年 | 8224篇 |
1989年 | 8008篇 |
1988年 | 7912篇 |
1987年 | 7718篇 |
1986年 | 7335篇 |
1985年 | 9365篇 |
1984年 | 9961篇 |
1983年 | 8323篇 |
1982年 | 8713篇 |
1981年 | 8309篇 |
1980年 | 7876篇 |
1979年 | 8345篇 |
1978年 | 8698篇 |
1977年 | 8554篇 |
1976年 | 8582篇 |
1975年 | 8150篇 |
1974年 | 7979篇 |
1973年 | 8369篇 |
1972年 | 5961篇 |
排序方式: 共有10000条查询结果,搜索用时 656 毫秒
191.
S. D. Campos 《中国物理C(英文版)》2020,44(10):103103-103103-10
This work presents the subtraction procedure and the Regge cut in the logarithmic Regge pole approach. The subtraction mechanism leads to the same asymptotic behavior as previously obtained in the non-subtraction case. The Regge cut, in contrast, introduces a clear role to the non-leading contributions for the asymptotic behavior of the total cross-section. From these results, some simple parameterization is introduced to fit the experimental data for the proton-proton and antiproton-proton total cross-section above some minimum value up to the cosmic-ray. The fit parameters obtained are used to present predictions for the \begin{document}$ \rho(s)$\end{document}
-parameter as well as to the elastic slope \begin{document}$ B(s)$\end{document}
at high energies. 相似文献
192.
193.
194.
Belakhov V. V. Boikova I. V. Krasnobaeva I. L. Kolodyaznaya V. A. 《Russian Journal of General Chemistry》2021,91(13):2900-2907
Russian Journal of General Chemistry - A method was developed for the synthesis of an organofluorine derivative of β-D-ribofuranoside. Biological tests revealed high insecticidal activity and... 相似文献
195.
Dinesh R. Hussain S. Imran Roseline A. Ameelia Kalaiselvam S. 《Journal of Thermal Analysis and Calorimetry》2021,145(6):2935-2949
Journal of Thermal Analysis and Calorimetry - In this paper, the variation of thermophysical properties such as the thermal conductivity, thermal energy storage capacity, viscosity, and phase... 相似文献
196.
Journal of Analytical Chemistry - Studies on the separation of the Se and Te trace components from Co, Ni, Cu, Fe, Cr, Mo, and W macrocomponents for their determination by inductively coupled... 相似文献
197.
V. V. Sagaradze N. V. Kataeva V. A. Zavalishin K. A. Kozlov V. V. Makarov A. R. Kuznetsov 《哲学杂志》2020,100(14):1868-1879
ABSTRACT The authors present the results of an investigation in Fe–Ni-Cr austenitic alloys of the low-temperature deformation-induced segregations of nickel that form in the micro regions being (i) located close to grain- and subgrain boundaries and (ii) characteristic of the concentration and magnetic inhomogeneities indicated by the appearance of a dark diffraction contrast at the electron diffraction patterns taken from these regions typical (at the same time) of an enhanced value of Curie temperature. The observed effects were connected with the micro distortions caused by the local change of lattice parameter because of an increase in nickel concentration, as well as in the result of a magnetostriction dilatation. Using methods of the X-ray energy dispersive spectroscopy (XEDS) and atomic-probe body-section radiography (tomography – APT) has made it possible to determine the borders of those regions of austenite that were characteristic of an enhanced concentration of nickel in the fields of the localisation of a deformation-induced segregation of nickel in the vicinity of grain (subgrain) boundaries of austenitic alloys of the types Fe–13Cr–30Ni and Fe–37Ni–3Ti. 相似文献
198.
Thalia Tsiaka Panagiotis Zoumpoulakis Vassilia J. Sinanoglou Constantinos Makris Georgios A. Heropoulos Antony C. Calokerinos 《Analytica chimica acta》2015
High-energy assisted extraction techniques, like ultrasound assisted extraction (UAE) and microwave assisted extraction (MAE), are widely applied over the last years for the recovery of bioactive compounds such as carotenoids, antioxidants and phenols from foods, animals and herbal natural sources. Especially for the case of xanthophylls, the main carotenoid group of crustaceans, they can be extracted in a rapid and quantitative way with the use of UAE and MAE. 相似文献
199.
I. F. Golovnev E. I. Golovneva L. A. Merzhievsky V. M. Fomin V. E. Panin 《Physical Mesomechanics》2015,18(3):179-186
Molecular dynamics simulation was performed to study the formation of cluster structure, interfaces, and surfaces with different curvature radii in a perfect nanocrystal passed through by a nonlinear wave. It is shown that this process is a type of nanostructure self-organization in response to an external energy flux with subsequent development of a strong rotational field. 相似文献
200.
JETP Letters - An Erratum to this paper has been published: https://doi.org/10.1134/S0021364022400028 相似文献