全文获取类型
收费全文 | 290871篇 |
免费 | 1882篇 |
国内免费 | 1000篇 |
专业分类
化学 | 140953篇 |
晶体学 | 4016篇 |
力学 | 14953篇 |
综合类 | 6篇 |
数学 | 54508篇 |
物理学 | 79317篇 |
出版年
2020年 | 1970篇 |
2019年 | 2265篇 |
2018年 | 13389篇 |
2017年 | 13159篇 |
2016年 | 10187篇 |
2015年 | 3182篇 |
2014年 | 4085篇 |
2013年 | 9529篇 |
2012年 | 10523篇 |
2011年 | 18603篇 |
2010年 | 11530篇 |
2009年 | 11787篇 |
2008年 | 14499篇 |
2007年 | 16664篇 |
2006年 | 7806篇 |
2005年 | 8159篇 |
2004年 | 7625篇 |
2003年 | 7535篇 |
2002年 | 6466篇 |
2001年 | 6165篇 |
2000年 | 4947篇 |
1999年 | 3596篇 |
1998年 | 3178篇 |
1997年 | 3168篇 |
1996年 | 3004篇 |
1995年 | 2432篇 |
1994年 | 2493篇 |
1993年 | 2541篇 |
1992年 | 2644篇 |
1991年 | 2718篇 |
1990年 | 2608篇 |
1989年 | 2591篇 |
1988年 | 2519篇 |
1987年 | 2490篇 |
1986年 | 2413篇 |
1985年 | 3082篇 |
1984年 | 3236篇 |
1983年 | 2595篇 |
1982年 | 2866篇 |
1981年 | 2740篇 |
1980年 | 2547篇 |
1979年 | 2761篇 |
1978年 | 2866篇 |
1977年 | 2874篇 |
1976年 | 2847篇 |
1975年 | 2703篇 |
1974年 | 2676篇 |
1973年 | 2835篇 |
1972年 | 1892篇 |
1967年 | 1840篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
王巨平 《中国科学A辑(英文版)》2002,45(7):827-835
This paper verifies the singularity conjecture for Jacobi forms with higher degree in some typical cases, and gives constructions
for the Jacobi cusp forms whose Fourier coefficients can be expressed by some kind of Rankin-typeL-series. 相似文献
82.
We consider Markov processes built from pasting together pieces of strong Markov processes which are killed at a position
dependent rate and connected via a transition kernel. We give necessary and sufficient conditions for local absolute continuity
of probability laws for such processes on a suitable path space and derive an explicit formula for the corresponding likelihood
ratio process. The main tool is the consideration of the process between successive jumps – what we call ‘elementary experiments’
– and criteria for absolute continuity of laws of the process there. We apply our results to systems of branching diffusions
with interactions and immigrations.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
83.
It is explicitly shown that if phase transition occurs at the core of a newborn neutron star with moderately strong magnetic
field strength, which populates only the electron’s Landau levels, then in the β -equilibrium condition, the quark core is
energetically much more unstable than the neutron matter of identical physical condition. 相似文献
84.
We study the induced measure obtained from a 1-step Markov measure, supported by a topological Markov chain, after the mapping of the original alphabet onto another one. We give sufficient conditions for the induced measure to be a Gibbs measure (in the sense of Bowen) when the factor system is again a topological Markov chain. This amounts to constructing, when it does exist, the induced potential and proving its Hölder continuity. This is achieved through a matrix method. We provide examples and counterexamples to illustrate our results. 相似文献
85.
Jeroen J. L. M. Cornelissen W. Sander Graswinckel Alan E. Rowan Nico A. J. M. Sommerdijk Roeland J. M. Nolte 《Journal of polymer science. Part A, Polymer chemistry》2003,41(11):1725-1736
The conformational properties of polymers derived from isocyanodipeptides have been investigated with a combination of model calculations, X‐ray diffraction, and circular dichroism spectroscopy. Depending on the configuration of the side chains, defined arrays of hydrogen bonds along the polymeric backbone are formed. This leads to a well‐defined conformation as, for example, expressed in the formation of lyotropic liquid‐crystalline phases and increased helical stability. Upon the disruption of the hydrogen bonds by a strong acid, a less well‐defined macromolecular conformation is observed. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 1725–1736, 2003 相似文献
86.
87.
88.
I. V. Denisova O. A. Ladyzhenskaya G. A. Seregin N. N. Uraltseva E. V. Frolova 《Journal of Mathematical Sciences》2005,130(4):4775-4779
Bibliography: 42 titles.__________Translated from Zapiski Nauchnykh Seminarov POMI, Vol. 306, 2003, pp. 7–15. 相似文献
89.
90.
Dimitar I. Pushkarov 《Central European Journal of Physics》2004,2(3):420-455
Basic ideas and results which characterize quantum diffusion of defects in quantum crystals like solid helium as a new phenomenon
are presented. Quantum effects in such media lead to a delocalization of point defects (vacancies, impurities etc.) and they
turn into quasiparticles of a new type—defectons, which are characterized not by their position in the crystal lattice but
by their quasimomentum and dispersion law. Defecton-defecton and defecton-phonon scattering are considered and an interpolation
formula for the diffusion coefficient valid in all interesting temperature and concentration regions is presented. A comparison
with the experimental data is made. Some alternative points of view are discussed in detail and the inconsistency of the Kisvarsanyi-Sullivan
theory is shown. 相似文献