全文获取类型
收费全文 | 1351710篇 |
免费 | 25761篇 |
国内免费 | 7691篇 |
专业分类
化学 | 665180篇 |
晶体学 | 20906篇 |
力学 | 75878篇 |
综合类 | 104篇 |
数学 | 245441篇 |
物理学 | 377653篇 |
出版年
2021年 | 13490篇 |
2020年 | 15910篇 |
2019年 | 16032篇 |
2018年 | 15560篇 |
2017年 | 14243篇 |
2016年 | 29056篇 |
2015年 | 21109篇 |
2014年 | 30415篇 |
2013年 | 74308篇 |
2012年 | 38219篇 |
2011年 | 36911篇 |
2010年 | 39162篇 |
2009年 | 41582篇 |
2008年 | 36016篇 |
2007年 | 32501篇 |
2006年 | 34547篇 |
2005年 | 30052篇 |
2004年 | 30106篇 |
2003年 | 28216篇 |
2002年 | 28613篇 |
2001年 | 26631篇 |
2000年 | 23611篇 |
1999年 | 21957篇 |
1998年 | 20827篇 |
1997年 | 20825篇 |
1996年 | 21022篇 |
1995年 | 19101篇 |
1994年 | 18548篇 |
1993年 | 18085篇 |
1992年 | 17771篇 |
1991年 | 18134篇 |
1990年 | 17305篇 |
1989年 | 17420篇 |
1988年 | 16972篇 |
1987年 | 17008篇 |
1986年 | 15846篇 |
1985年 | 22345篇 |
1984年 | 23649篇 |
1983年 | 19885篇 |
1982年 | 21587篇 |
1981年 | 20845篇 |
1980年 | 20156篇 |
1979年 | 20248篇 |
1978年 | 21642篇 |
1977年 | 21211篇 |
1976年 | 20875篇 |
1975年 | 19543篇 |
1974年 | 19174篇 |
1973年 | 19677篇 |
1972年 | 14157篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
995.
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
996.
V. I. Bardyshev 《Acoustical Physics》2004,50(6):641-646
Measurements of response, gain, and noise immunity are carried out for an underwater compensated additive receiving array with randomly spaced hydrophones that is moored at the bottom of a man-made lake with multimode sound propagation. The in-sea locating ability of a similar array is demonstrated with the sources of noiselike signals at frequencies of 5–100 Hz. A dedicated numerical processor is developed and tested for processing the signals received by a random underwater array. 相似文献
997.
O. V. Kirichenko D. Krstovska V. G. Peschansky 《Journal of Experimental and Theoretical Physics》2004,99(1):217-223
Thermoelectric effects are investigated theoretically in layered conductors with a quasi-two-dimensional electron energy spectrum of arbitrary type in a strong magnetic field. It is shown that, at temperatures sufficiently low for quantization of the orbital motion of charge carriers in a magnetic field to be required, there exist giant quantum oscillations of the thermoelectric field. Thermoelectric emf is studied as a f unction of the orientation of the magnetic field with respect to the layers; experimental investigation of this function allows one to determine the velocity distribution of conduction electrons on the Fermi surface. 相似文献
998.
The magnetic absorption cross section of a small spherical particle with a dielectric core and a metallic shell is calculated. The general case is considered when the ratio of the radius of the dielectric core to the total radius of the particle may take arbitrary values. The condition of specular-diffuse reflection of conduction electrons from the surfaces of the metal layer of the particle is chosen as the boundary conditions of the problem. The limit cases are considered, and the results are discussed. 相似文献
999.
Deeper insight into the features of a reactor as a source of antineutrinos is required for making further advances in studying the fundamental properties of the neutrino. The relationship between the thermal power of a reactor and the rate of the chain fission reaction in its core is analyzed. 相似文献
1000.
S. A. Sadovsky Yu. V. Kharlov A. L. S. Angelis E. Gładysz-Dziaduś V. L. Korotkikh G. Mavromanolakis A. D. Panagiotou 《Physics of Atomic Nuclei》2004,67(2):396-405
A phenomenological model for describing the production of Centauro events in relativistic heavy-ion collisions is discussed. The model provides quantitative predictions for kinematical variables, for the baryon number, and for the masses of a Centauro fireball and of its decay products. A Centauro fireball decays predominantly into nucleons, strange hyperons, and possibly strangelets. Centauro events in Pb + Pb collisions at the LHC energy are simulated for the CASTOR detector. The signatures of these events are discussed in detail. 相似文献