全文获取类型
收费全文 | 5741篇 |
免费 | 47篇 |
国内免费 | 31篇 |
专业分类
化学 | 3322篇 |
晶体学 | 58篇 |
力学 | 247篇 |
数学 | 898篇 |
物理学 | 1294篇 |
出版年
2022年 | 56篇 |
2021年 | 80篇 |
2020年 | 114篇 |
2019年 | 108篇 |
2018年 | 138篇 |
2017年 | 164篇 |
2016年 | 155篇 |
2014年 | 125篇 |
2013年 | 251篇 |
2012年 | 180篇 |
2011年 | 218篇 |
2010年 | 191篇 |
2009年 | 204篇 |
2008年 | 181篇 |
2007年 | 189篇 |
2006年 | 148篇 |
2005年 | 114篇 |
2004年 | 124篇 |
2003年 | 129篇 |
2002年 | 138篇 |
2001年 | 102篇 |
2000年 | 82篇 |
1999年 | 60篇 |
1998年 | 60篇 |
1997年 | 60篇 |
1995年 | 94篇 |
1994年 | 105篇 |
1993年 | 82篇 |
1992年 | 59篇 |
1991年 | 84篇 |
1990年 | 87篇 |
1989年 | 79篇 |
1988年 | 62篇 |
1987年 | 79篇 |
1986年 | 66篇 |
1985年 | 87篇 |
1984年 | 116篇 |
1983年 | 74篇 |
1982年 | 88篇 |
1981年 | 69篇 |
1980年 | 70篇 |
1979年 | 110篇 |
1978年 | 101篇 |
1977年 | 105篇 |
1976年 | 113篇 |
1975年 | 92篇 |
1974年 | 60篇 |
1973年 | 85篇 |
1972年 | 65篇 |
1970年 | 67篇 |
排序方式: 共有5819条查询结果,搜索用时 15 毫秒
21.
Sh. Dokan 《Colloid and polymer science》1925,37(5):283-296
Ohne Zusammenfassung 相似文献
22.
Physics of the Solid State - Justification and generalization of the glass transition criterion of Schmelzer is proposed with the involvement of the model of delocalized atoms. Unlike the... 相似文献
23.
Ismailov Sh. M. Arapov Yu. D. Kamenev V. G. 《Radiophysics and Quantum Electronics》2021,63(8):571-581
Radiophysics and Quantum Electronics - We describe experimental studies of the recording of the relief of a diffusely reflecting surface using a shear interferometer. The interferometer uses a... 相似文献
24.
25.
G. Sh. Tsitsiashvili 《Journal of Mathematical Sciences》1986,32(1):90-97
A method of stability analysis is considered for the solution of the inverse queuing problem, and quantitative estimates are obtained.Translated from Problemy Ustoichivosti Stokhasticheskikh Modelei — Trudy Seminara, pp. 107–115, 1980.The author expresses his gratitude to V. V. Kalashnikov for a useful discussion of this paper. 相似文献
26.
I. P. Studenyak M. Kranjcec L. M. Suslikov D. Sh. Kovacs V. V. Pan’ko 《Optics and Spectroscopy》2002,92(4):532-535
The absorption edge in Cu6P(S1?x Sex)5Br crystals has been studied for strong absorption in the temperature range of 77–330 K. The parameters of the Urbach absorption edge and exciton-phonon interactions in Cu6P(S1-x Sex)5Br crystals are determined and their effect on the composition disorder is studied. 相似文献
27.
28.
29.
Sh.B. Atakulov 《Solid State Communications》1984,51(6):415-419
The peculiarities of the potential shape in polycrystalline films were considered. It was shown that the barrier height (φB) in sites (the place where three or more crystallites are connected) with respect to the concentration of boundary states (BS) was higher or coincided with the barrier height (φA) at the crystallite boundaries (CB). That is why the sites for majority charge carriers in films were “blocked down” and current transport along CB was not realized. If inversion of the conductivity type at CB was absent, the Hall potential was generated in quasi-neutral regions of crystallites and in barrier regions perpendicular to the current lines. If the Hall potential coefficient (RH) of the film is determined by the carrier concentration n0 in quasi-neutral regions. In this case the activation energy of the Hall mobility was equal to the activation energy of the conductivity (σA). In the opposite case the inversion conductivity type takes place on CB. When the inversion regions are present near the barrier tops and conductivity is realized along CB, RHp ~ (NcNv/n0)-1 exp (Eg?φB/kT) and μHp ~ exp (?φB?φA/kT), where Eg is the band gap, Nc, Nv are the effective density of states in the conduction and valence bands. 相似文献
30.