全文获取类型
收费全文 | 2367篇 |
免费 | 25篇 |
国内免费 | 3篇 |
专业分类
化学 | 1312篇 |
晶体学 | 24篇 |
力学 | 54篇 |
数学 | 214篇 |
物理学 | 791篇 |
出版年
2022年 | 26篇 |
2021年 | 46篇 |
2020年 | 30篇 |
2019年 | 51篇 |
2018年 | 54篇 |
2017年 | 55篇 |
2016年 | 79篇 |
2015年 | 42篇 |
2014年 | 66篇 |
2013年 | 102篇 |
2012年 | 90篇 |
2011年 | 116篇 |
2010年 | 105篇 |
2009年 | 90篇 |
2008年 | 114篇 |
2007年 | 115篇 |
2006年 | 91篇 |
2005年 | 88篇 |
2004年 | 65篇 |
2003年 | 58篇 |
2002年 | 61篇 |
2001年 | 46篇 |
2000年 | 41篇 |
1999年 | 41篇 |
1998年 | 22篇 |
1997年 | 28篇 |
1996年 | 22篇 |
1995年 | 19篇 |
1994年 | 26篇 |
1993年 | 20篇 |
1992年 | 31篇 |
1991年 | 21篇 |
1990年 | 26篇 |
1989年 | 22篇 |
1988年 | 23篇 |
1987年 | 29篇 |
1986年 | 21篇 |
1983年 | 20篇 |
1982年 | 22篇 |
1980年 | 21篇 |
1978年 | 36篇 |
1977年 | 22篇 |
1976年 | 18篇 |
1975年 | 24篇 |
1974年 | 26篇 |
1973年 | 21篇 |
1972年 | 18篇 |
1971年 | 18篇 |
1968年 | 20篇 |
1967年 | 18篇 |
排序方式: 共有2395条查询结果,搜索用时 31 毫秒
991.
D. D. Sokolov 《Mathematical Notes》1971,9(2):113-116
It is proved that every pseudo-Riemannian manifold M
(p, q)
n
with the Ck metric (3k) has an isometric Ck imbedding in the large in E
(p, q)
n(n+1)(3n+11)/2
, p(n+1)2, q(n+1)2.Translated from Matematicheskie Zametki, Vol. 9, No. 2, pp. 193–198, February, 1971. 相似文献
992.
The probability of emission of a hard γ-quantum in relativistic electron transitions to the ground (or near it) level in a magnetic field H ~ H0 = m2c3/e0? = 4.41 × 1013G is obtained. For the inverse transitions from these levels the cross-section of electron photoexitation is calculated. 相似文献
993.
A. A. Zhukov M. R. Trunin A. T. Sokolov N. N. Kolesnikov 《Journal of Experimental and Theoretical Physics》1997,85(6):1211-1217
The real part R
s and the imaginary part X
s of the surface impedance Z
s=R
s+ iX
s of Tl2Ba2CaCu2O8−δ
and YBa2Cu3O6.95 single crystals have been measured with high precision at frequency ω/2π=9.4 GHz in the temperature range 0<T<140 K. In the Tl2Ba2CaCu2O8−δ
crystal a linear temperature dependence R
s(T) has been found for T⩽50 K, and the magnetic field penetration depth λ(4.2 K)=X
s(4.2 K)/ω μ
0≈3760 Å has been measured. Along with well known features of the function Z
s(T) in high-quality YBa2Cu3O6.95 single crystals, such as the linearity of λ(T) and R
s(T) for T<T
c/3 and a maximum of R
s(T) at T∼T
c/2, the linearity range of λ(T) extends to T≃50 K, and this curve has a plateau in the range 60<T<85 K. The curve of R
s(T) in both the superconducting and normal states of YBa2Cu3O6.95 is well described by a two-fluid model with the electron-phonon mechanism of quasiparticle relaxation. A formula describing
the curve of λ
2(0)/λ
2(T) throughout the studied temperature range is also given.
Zh. éksp. Teor. Fiz. 112, 2210–2222 (December 1997) 相似文献
994.
A study of cathodoluminescence spectra of silicon oxide films grown thermally on silicon is reported. It has been established
that the cathodoluminescence properties of thermal films are nonuniform in depth and depend on the growth conditions and characteristics
of the silicon substrate.
Fiz. Tverd. Tela (St. Petersburg) 40, 1984–1989 (November 1998) 相似文献
995.
996.
A. N. Chekhlov A. Yu. Aksinenko A. N. Pushin V. B. Sokolov 《Russian Chemical Bulletin》1995,44(8):1531-1532
An unusually strong intramolecular C-H...N hydrogen bond with the shortest known H...N distance of 2.00(3) » has been found by X-ray diffraction analysis.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1593–1595, August, 1995. 相似文献
997.
M. R. Trunin A. A. Zhukov G. É. Tsydynzhapov A. T. Sokolov L. A. Klinkova N. V. Barkovskii 《JETP Letters》1996,64(11):832-838
The temperature dependences of the real part R
s
and the imaginary part X
s
of the surface impedance Z
s
=R
s
+iX
s
of the superconductor Ba0.6K0.4BiO3 (T
c
≃30 K) are measured at a frequency of 9.4 GHz. Its temperature dependence
Z
s
(T) and that of the complex conductivity σ
s
(T) can be described on the basis of a two-fluid model under two assumptions: The density of superconducting carriers increases
linearly, and the relaxation time increases as a power law (∝1/T
5), with decreasing temperature T<T
c
. This model also describes well the curves Z
s
(T) and σs (T) recently measured for YBa2Cu3O6.95 and Bi2Sr2CaCu2O8 single crystals.
Pis’ma Zh. éksp. Teor. Fiz. 64, No. 11, 783–788 (10 December 1996) 相似文献
998.
999.
O. V. Korenchenko A. Yu. Aksinenko V. B. Sokolov A. N. Pushin I. V. Martynov 《Russian Chemical Bulletin》1990,39(12):2615-2615
Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2879–2880. December, 1990. 相似文献
1000.