全文获取类型
收费全文 | 361篇 |
免费 | 0篇 |
专业分类
化学 | 194篇 |
晶体学 | 5篇 |
力学 | 2篇 |
数学 | 40篇 |
物理学 | 120篇 |
出版年
2021年 | 5篇 |
2019年 | 4篇 |
2018年 | 7篇 |
2017年 | 4篇 |
2015年 | 5篇 |
2014年 | 7篇 |
2012年 | 10篇 |
2011年 | 9篇 |
2010年 | 16篇 |
2009年 | 18篇 |
2008年 | 4篇 |
2007年 | 14篇 |
2006年 | 5篇 |
2005年 | 11篇 |
2004年 | 10篇 |
2003年 | 4篇 |
2001年 | 11篇 |
2000年 | 7篇 |
1999年 | 8篇 |
1998年 | 11篇 |
1997年 | 11篇 |
1992年 | 3篇 |
1991年 | 3篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1987年 | 6篇 |
1986年 | 7篇 |
1985年 | 8篇 |
1984年 | 7篇 |
1983年 | 6篇 |
1982年 | 4篇 |
1981年 | 8篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1975年 | 4篇 |
1974年 | 6篇 |
1973年 | 9篇 |
1971年 | 9篇 |
1970年 | 5篇 |
1969年 | 4篇 |
1968年 | 3篇 |
1967年 | 8篇 |
1966年 | 5篇 |
1965年 | 6篇 |
1964年 | 3篇 |
1961年 | 3篇 |
1960年 | 3篇 |
1959年 | 3篇 |
排序方式: 共有361条查询结果,搜索用时 31 毫秒
101.
Boson-fermion Holstein-Primakoff mapping at nonzero temperatures for the example of the Lipkin model
Within the formalism of thermo field dynamics, the boson-fermion Holstein-Primakoff transformation is constructed for the case of nonzero temperatures. For the example of the Lipkin model, the transformation in question is used to construct a thermal Hamiltonian in the form of an expansion in the parameter \({1 \mathord{\left/ {\vphantom {1 {\sqrt N }}} \right. \kern-\nulldelimiterspace} {\sqrt N }}\), where N is the number of particles in the system. The temperature dependence of quasiparticle (fermion) and collective-excitation (boson) energies is calculated to terms of order 1/N. 相似文献
102.
Yu. N. Khanin E. E. Vdovin S. V. Dubonos A. Levin L. Eaves M. Henini 《JETP Letters》2005,82(8):526-531
The electron transport is studied in split-gate structures fabricated on the basis of a modulation-doped heterostructure that contains a single quantum well and self-assembled InAs quantum dots near the 2D electron gas regions. The current passing through the channel with a denumerable set of InAs quantum dots is found to exhibit Coulomb oscillations as a function of the gate voltage. The oscillations are associated with the excited p states of InAs quantum dots, which are characterized by opposite spins and caused by lifting of the spin degeneracy of the p state due to the Coulomb interaction. The Coulomb oscillations of the current are observed up to a temperature of ~20 K. The Coulomb energy is found to be ΔEc = 12.5 meV, which agrees well with the theoretical estimates for the p states of quantum dots in the structures under study. 相似文献
103.
Smart microscope: an adaptive optics learning system for aberration correction in multiphoton confocal microscopy 总被引:3,自引:0,他引:3
Off-axis aberrations in a beam-scanning multiphoton confocal microscope are corrected with a deformable mirror. The optimal mirror shape for each pixel is determined by a genetic learning algorithm, in which the second-harmonic or two-photon fluorescence signal from a reference sample is maximized. The speed of the convergence is improved by use of a Zernike polynomial basis for the deformable mirror shape. This adaptive optical correction scheme is implemented in an all-reflective system by use of extremely short (10-fs) optical pulses, and it is shown that the scanning area of an f:1 off-axis parabola can be increased by nine times with this technique. 相似文献
104.
105.
106.
V. Yu. Ponomarev Ch. Stoyanov A. I. Vdovin 《Zeitschrift für Physik A Hadrons and Nuclei》1982,308(2):157-163
The cross section of inelastic scattering of slow electrons at large angles with excitation of high-lying 1+-states in208Pb are calculated in DWBA. The calculations are carried out both in the random-phase approximation and with the interaction of one-and two-phonon states in the framework of semi-microscopic quasi-particle-phonon model. A group of noncollective 1+-states with a large excitation probability in backward (e, é)-scattering is found in the excitation energy region of 17–21 MeV. We discuss also the problem of existence, properties, and possibility of discovery the high-lying collective 1+-states (2?ω M 1-resonance) predicted by Speth et al. 相似文献
107.
108.
109.
110.
Summary The hydrolysis of dichloro compounds in which the chlorine atoms were attached to terminal silicon atoms in chain compounds gave both liquid and solid organosilicon polymers in which hydrocarbon or sila-hydrocarbon units alternated with siloxane units. 相似文献