全文获取类型
收费全文 | 1435063篇 |
免费 | 29993篇 |
国内免费 | 7756篇 |
专业分类
化学 | 723638篇 |
晶体学 | 14831篇 |
力学 | 77170篇 |
综合类 | 116篇 |
数学 | 251037篇 |
物理学 | 406020篇 |
出版年
2020年 | 16012篇 |
2019年 | 16135篇 |
2018年 | 17346篇 |
2017年 | 16131篇 |
2016年 | 30137篇 |
2015年 | 21365篇 |
2014年 | 30657篇 |
2013年 | 74853篇 |
2012年 | 44864篇 |
2011年 | 47807篇 |
2010年 | 42008篇 |
2009年 | 43313篇 |
2008年 | 44974篇 |
2007年 | 42726篇 |
2006年 | 42844篇 |
2005年 | 38455篇 |
2004年 | 37206篇 |
2003年 | 32770篇 |
2002年 | 29486篇 |
2001年 | 32451篇 |
2000年 | 26045篇 |
1999年 | 21755篇 |
1998年 | 19415篇 |
1997年 | 19919篇 |
1996年 | 19542篇 |
1995年 | 18774篇 |
1994年 | 18376篇 |
1993年 | 17881篇 |
1992年 | 18574篇 |
1991年 | 18692篇 |
1990年 | 17960篇 |
1989年 | 17959篇 |
1988年 | 17582篇 |
1987年 | 17501篇 |
1986年 | 16442篇 |
1985年 | 22921篇 |
1984年 | 23950篇 |
1983年 | 19954篇 |
1982年 | 21488篇 |
1981年 | 20703篇 |
1980年 | 20005篇 |
1979年 | 20654篇 |
1978年 | 21753篇 |
1977年 | 21509篇 |
1976年 | 21290篇 |
1975年 | 20014篇 |
1974年 | 19692篇 |
1973年 | 20192篇 |
1972年 | 14631篇 |
1967年 | 13026篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
Stoyanovskii O. I. Galutskii V. G. Kotov D. I. 《Journal of Applied Mechanics and Technical Physics》2022,63(2):321-328
Journal of Applied Mechanics and Technical Physics - The wear resistance of DI37-VI and EK80-VI steel is studied using a friction testing device. A sample made of high-carbon chromium-vanadium... 相似文献
92.
Given a graph sequence denote by T3(Gn) the number of monochromatic triangles in a uniformly random coloring of the vertices of Gn with colors. In this paper we prove a central limit theorem (CLT) for T3(Gn) with explicit error rates, using a quantitative version of the martingale CLT. We then relate this error term to the well-known fourth-moment phenomenon, which, interestingly, holds only when the number of colors satisfies . We also show that the convergence of the fourth moment is necessary to obtain a Gaussian limit for any , which, together with the above result, implies that the fourth-moment condition characterizes the limiting normal distribution of T3(Gn), whenever . Finally, to illustrate the promise of our approach, we include an alternative proof of the CLT for the number of monochromatic edges, which provides quantitative rates for the results obtained in [7]. 相似文献
93.
Mathematical Notes - A system of new differential-geometric notions as the result of an analysis of the Trudinger–Wang inequalities is proposed. Their naturalness in multivariate analysis and... 相似文献
94.
Theoretical and Mathematical Physics - This paper is devoted to tetrahedron maps, which are set-theoretical solutions of the Zamolodchikov tetrahedron equation. We construct a family of tetrahedron... 相似文献
95.
Timofeev V. I. Abramchik Yu. A. Muravyova T. I. Zhukhlistova N. E. Esipov R. S. Kuranova I. P. 《Crystallography Reports》2021,66(5):769-776
Crystallography Reports - The three-dimensional structure of recombinant thermophilic ribokinase from Thermus speсies 2.9 was determined at 2.4 Å resolution using crystals, which were... 相似文献
96.
Experimental Mechanics - Temperature gradients significantly affect the material fatigue process. A reliable and robust test procedure is needed for quantifying the effects of temperature gradients... 相似文献
97.
Guzev M. A. Liu W. Qi Ch. Riabokon E. P. 《Journal of Applied Mechanics and Technical Physics》2021,62(5):736-741
Journal of Applied Mechanics and Technical Physics - A self-equilibrated stress field for an incompressible sphere is constructed based on a non-Euclidean continuum model. The... 相似文献
98.
International Journal of Theoretical Physics - The interaction between two modes quantized field and asymmetric two atoms represents one of the important quantum models to study the nonclassical... 相似文献
99.
Acta Mathematica Hungarica - Minkowski’s classical existence theorem provides necessary and sufficient conditions for a Borel measure on the unit sphere of Euclidean space to be the surface... 相似文献
100.
Butenko A. V. Galimov A. R. Meshkov I. N. Syresin E. M. Tolstikhina I. Yu. Tuzikov A. V. Philippov A. V. Khodzhibagiyan H. G. Shevel’ko V. P. 《JETP Letters》2021,113(12):752-756
JETP Letters - The results of the first run (December 2020) for the commissioning of the new superconducting synchrotron Booster at the Joint Institute for Nuclear Research are presented. Vacuum... 相似文献