全文获取类型
收费全文 | 28842篇 |
免费 | 7780篇 |
国内免费 | 6353篇 |
专业分类
化学 | 5389篇 |
晶体学 | 210篇 |
力学 | 4716篇 |
综合类 | 1184篇 |
数学 | 13752篇 |
物理学 | 17724篇 |
出版年
2024年 | 243篇 |
2023年 | 787篇 |
2022年 | 1077篇 |
2021年 | 1081篇 |
2020年 | 873篇 |
2019年 | 996篇 |
2018年 | 692篇 |
2017年 | 1043篇 |
2016年 | 1137篇 |
2015年 | 1295篇 |
2014年 | 2272篇 |
2013年 | 1650篇 |
2012年 | 1728篇 |
2011年 | 2073篇 |
2010年 | 2105篇 |
2009年 | 2282篇 |
2008年 | 2215篇 |
2007年 | 1894篇 |
2006年 | 1974篇 |
2005年 | 1809篇 |
2004年 | 1857篇 |
2003年 | 1648篇 |
2002年 | 1374篇 |
2001年 | 1227篇 |
2000年 | 1016篇 |
1999年 | 907篇 |
1998年 | 785篇 |
1997年 | 779篇 |
1996年 | 687篇 |
1995年 | 685篇 |
1994年 | 602篇 |
1993年 | 434篇 |
1992年 | 460篇 |
1991年 | 418篇 |
1990年 | 353篇 |
1989年 | 347篇 |
1988年 | 60篇 |
1987年 | 47篇 |
1986年 | 22篇 |
1985年 | 6篇 |
1984年 | 7篇 |
1983年 | 5篇 |
1982年 | 5篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 1篇 |
1977年 | 1篇 |
1963年 | 1篇 |
1959年 | 9篇 |
1951年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
The decay process J/ψ→p X X→p P,where p,p and P are the proton,antiproton and pseudoscalar states,respectively,has been studied in terms of the angular distribution and the generalized moment analysis methods.The result shows that we can identify the spin,but cannot determine the parity of the baryon resonance state X produced in the process J/ψ→p X X→p P. 相似文献
92.
93.
F.Oner R.A.Mamedoy 《理论物理通讯》2002,37(3):327-330
Behavior of the Coulomb energy difference for light nuclei is explained in terms of the different values of the average Coulomb interaction between two particles.Coulomb energy difference according to shell model of light mirror nuclei in the Coulomb and exchange integrals in the formula can be explained with exponential-type wavefunctions.In this study,using the one-center expansion of exponential-type wavefunctions in terms of Slater-type orbitals with the same center,we derived formula for Coulomb energy difference of light mirror nuclei. 相似文献
94.
95.
相位差与q变形广义相干叠加态的压缩特性 总被引:1,自引:0,他引:1
对于q变形的非简谐振子广义相干态的叠加态β〉+eiφβeiδ〉,其量子涨落的可能高阶压缩阶数可以表示为k≠2πn/δ,这里n是整数.当δ=π时,压缩阶数不能是偶数即只能是奇数,这正是q变形非简谐振子广义奇偶相干态的结果.由此表明参数相位差δ对决定q变形的非简谐振子广义相干态叠加态的高阶压缩阶数起决定性作用. 相似文献
96.
Equation of State of Dense Liquid Nitrogen in the Region of the Dissociative Phase Transition 总被引:1,自引:0,他引:1 下载免费PDF全文
We have measured the equation of state for liquid nitrogen compressed dynamically to a pressure of 10-60 GPa by employing a two-stage light-gas gun.The data show a continuous phase transition above the shock pressure of 33GPa,as indicated previously by shock wave experiments.A theoretical model has been derived to examine the experimental data by inducing a molecular dissociative fraction.According to theoretical and experimental date the phase transition was thought to be a molecular dissociative phase transition. 相似文献
97.
Exact Solution of an Extended Hubbard Model with Electron—Lattice Interaction for an Organic Ferromagnetic Polymer 下载免费PDF全文
Using an exact diagonalization method,we study an extended Hubbard model with an electron-lattice interaction for an organic ferromagnetic chain with radical coupling.The result shows that the ferromagnetic ground state originates from the antiferromagnetic correlation between adjoining sites,which is enhanced by the on-site e-e repulsion.The intersite e-e repulsion induces the inhomogeneous distribution of the charge density.The dimerization is decreased by the e-e interaction and the radical coupling.The electron-lattice interaction and the radical coupling can transfer the spin density and charge density between the main chain and the radicals. 相似文献
98.
99.
Jing Cheng 《量子光学学报》2006,12(B08):71-72
The effect of finite control beam on the transverse spatial profile of the slow light propagation in an electromagnetically induced transparency medium is studied. From the second-order wave equation and linear response of an EIT medium to the signal field, we find it is possible to produce an effective waveguide for the signal field. The existence and properties of a set of localized, stationary transverse modes are demonstrated. Especially, by carefully manipulating the profile of the control beam, we can realize single-mode propagation for the signal field, which may be important for potential applications. 相似文献
100.