全文获取类型
收费全文 | 327260篇 |
免费 | 2860篇 |
国内免费 | 955篇 |
专业分类
化学 | 171138篇 |
晶体学 | 5368篇 |
力学 | 14556篇 |
综合类 | 8篇 |
数学 | 34985篇 |
物理学 | 105020篇 |
出版年
2021年 | 2523篇 |
2020年 | 2768篇 |
2019年 | 3041篇 |
2018年 | 4025篇 |
2017年 | 4002篇 |
2016年 | 5872篇 |
2015年 | 3633篇 |
2014年 | 5580篇 |
2013年 | 14229篇 |
2012年 | 11201篇 |
2011年 | 13515篇 |
2010年 | 9430篇 |
2009年 | 9410篇 |
2008年 | 12610篇 |
2007年 | 12526篇 |
2006年 | 12091篇 |
2005年 | 10880篇 |
2004年 | 10048篇 |
2003年 | 9027篇 |
2002年 | 8751篇 |
2001年 | 10906篇 |
2000年 | 8235篇 |
1999年 | 6378篇 |
1998年 | 4802篇 |
1997年 | 4900篇 |
1996年 | 4543篇 |
1995年 | 4209篇 |
1994年 | 4067篇 |
1993年 | 3786篇 |
1992年 | 4581篇 |
1991年 | 4645篇 |
1990年 | 4464篇 |
1989年 | 4232篇 |
1988年 | 4233篇 |
1987年 | 4268篇 |
1986年 | 3911篇 |
1985年 | 5037篇 |
1984年 | 5267篇 |
1983年 | 4277篇 |
1982年 | 4434篇 |
1981年 | 4259篇 |
1980年 | 4123篇 |
1979年 | 4452篇 |
1978年 | 4621篇 |
1977年 | 4593篇 |
1976年 | 4590篇 |
1975年 | 4285篇 |
1974年 | 4250篇 |
1973年 | 4401篇 |
1972年 | 2854篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
161.
162.
I. T. Dyatlov 《Physics of Atomic Nuclei》2004,67(4):804-807
In Nambu-Jona-Lasinio models for a dynamical breakdown of chiral symmetry, unrenormalized divergences hinder a direct comparison of vacuum energies of different solutions. The choice of a stable vacuum in the presence of several solutions to the equations for fermion masses can nevertheless be performed since, for unstable states, tachyons appear in the spectrum of composite scalar bosons. 相似文献
163.
B. P. Sorokin D. A. Glushkov L. N. Bezmaternykh V. L. Temerov I. A. Gudim K. S. Aleksandrov 《Physics of the Solid State》2004,46(3):458-461
Single crystals of lead gallium germanate Pb3Ga2Ge4O14 are grown from their own solution melts. The propagation of bulk acoustic waves is investigated, and the elastic, piezoelectric, and dielectric constants are calculated. The temperature dependences of the dielectric constants of this compound are analyzed. 相似文献
164.
E. A. Ekimov E. L. Gromnitskaya D. A. Mazalov A. F. Pal’ V. V. Pichugin S. Gierlotka B. Palosz J. A. Kozubowski 《Physics of the Solid State》2004,46(4):755-757
Superhard nanodiamond-SiC ceramics are prepared by infiltrating liquid Si into porous nanodiamond compacts under pressure.
Synthesized samples are 2.2 mm thick and 3–4 mm in diameter. The effect of particle size of dynamically synthesized nanodiamond
powders on silicon infiltration and SiC phase formation is studied. It is established that silicon does not penetrate into
the pores of nanodiamond powders if the original particle size is smaller than 0.5–1.0 μm. The critical pore size for infiltration
is 100–200 nm. A study of the microstructure of the samples showed the presence of the nanometer-and submicron-scale SiC phase.
The ultrasound velocities are measured in the prepared compacts, and the elastic moduli are calculated.
__________
Translated from Fizika Tverdogo Tela, Vol. 46, No. 4, 2004, pp. 734–736.
Original Russian Text Copyright ? 2004 by Ekimov, Gromnitskaya, Mazalov, Pal’, Pichugin, Gierlotka, Palosz, Kozubowski. 相似文献
165.
V. V. Popov T. V. Teperik O. V. Polischuk X. G. Peralta S. J. Allen N. J. M. Horing M. C. Wanke 《Physics of the Solid State》2004,46(1):153-156
The terahertz absorption spectra of plasmon modes in a grid-gated double-quantum-well field-effect transistor structure is analyzed theoretically and numerically using the scattering matrix approach and is shown to faithfully reproduce strong resonant features of recent experimental observations of terahertz photo-conductivity in such a structure. 相似文献
166.
167.
Technical Physics - Analytical models for the magnetization vector field B m in a uniaxial ferromagnetic film are studied. Some of them are found to closely approximate B m even if the quality... 相似文献
168.
Dineykhan M. Zhaugasheva S. A. Kozhamkulov T. A. Petrov E. V. 《Russian Physics Journal》2004,47(12):1250-1260
The mass spectrum of a coupled state is analytically determined. The mechanism of production of a constituent mass of particles forming a coupled state is explained. The change of the coupled state and constituent particle component masses attendant to changes of the coupling constant is analyzed. The mass spectrum of a two-gluon glueball is determined with allowance for spin-orbital and spin-spin interactions.__________Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 33–41, December, 2004. 相似文献
169.
170.
The study of the effect of a perfectly conducting plane placed at a certain distance from the surface of a potassium niobate crystal on the characteristics of the generalized Rayleigh and Gulyaev-Bleustein surface waves is continued. In addition, the effect of an infinitely thin conducting layer applied to the surface of the piezoelectric on the characteristics of these waves is analyzed. It is found that a variation in the conductance of this layer can produce a result that completely differs from the result obtained when a perfectly conducting plane is moved toward the surface, although the extreme states of these actions (electrically open and short-circuited surfaces) are identical. A possible physical explanation of this difference is proposed. 相似文献