全文获取类型
收费全文 | 125767篇 |
免费 | 2083篇 |
国内免费 | 146篇 |
专业分类
化学 | 69632篇 |
晶体学 | 1518篇 |
力学 | 4313篇 |
综合类 | 1篇 |
数学 | 15242篇 |
物理学 | 37290篇 |
出版年
2021年 | 1233篇 |
2020年 | 1561篇 |
2019年 | 1517篇 |
2018年 | 2088篇 |
2017年 | 2167篇 |
2016年 | 3303篇 |
2015年 | 1972篇 |
2014年 | 2794篇 |
2013年 | 5576篇 |
2012年 | 4728篇 |
2011年 | 5515篇 |
2010年 | 3850篇 |
2009年 | 3653篇 |
2008年 | 5120篇 |
2007年 | 4930篇 |
2006年 | 4590篇 |
2005年 | 4080篇 |
2004年 | 3544篇 |
2003年 | 3212篇 |
2002年 | 3201篇 |
2001年 | 3164篇 |
2000年 | 2463篇 |
1999年 | 1888篇 |
1998年 | 1676篇 |
1997年 | 1582篇 |
1996年 | 1586篇 |
1995年 | 1454篇 |
1994年 | 1460篇 |
1993年 | 1532篇 |
1992年 | 1518篇 |
1991年 | 1396篇 |
1990年 | 1416篇 |
1989年 | 1360篇 |
1988年 | 1312篇 |
1987年 | 1266篇 |
1986年 | 1182篇 |
1985年 | 1469篇 |
1984年 | 1593篇 |
1983年 | 1361篇 |
1982年 | 1424篇 |
1981年 | 1304篇 |
1980年 | 1228篇 |
1979年 | 1264篇 |
1978年 | 1413篇 |
1977年 | 1388篇 |
1976年 | 1229篇 |
1975年 | 1196篇 |
1974年 | 1198篇 |
1973年 | 1176篇 |
1967年 | 867篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
131.
We use the adiabatic hyperspheric expansion and the Faddeev decomposition of the wave function with only s-waves. We derive for a fixed hyperradius an integro-differential equation for the angular eigenvalue and wave function. The
correlations lower the interaction energy for N = 20 by about a factor of 5.
Received October 22, 2001; accepted for publication November 5, 2001 相似文献
132.
133.
134.
A. G. Artukh G. F. Gridnev M. Gruszecki F. Koscielniak A. G. Semchenkov O. V. Semchenkova Yu. M. Sereda J. Szmider Yu. G. Teterev 《Physics of Atomic Nuclei》2002,65(3):393-399
A systematic investigation of the forward-angle inclusive yields of 2≤Z≤11 isotopes produced in collisions of 18O projectile nuclei with a 9Be target in the Fermi energy region (35A MeV) is performed. The measurements were based on the use of the COMBAS double achromatic kinematical separator in the spectrometry mode at the Flerov Laboratory of Nuclear Reactions at the Joint Institute for Nuclear Research, FLNR (JINR, Dubna). The velocity, isotopic, and element distributions are presented. There is no unique mechanism that would explain the total set of results obtained in this experiment. A dominant role of low-energy reaction mechanisms is observed. The intensity of secondary beams of halolike nuclei 11Li, 12Be, and 14Be is determined. 相似文献
135.
O. Kortner M.P. Locher V.E. Markushin P. Weber O. Wigger 《The European Physical Journal C - Particles and Fields》2002,25(3):353-360
We study correlations in the exclusive reaction at rest with complete reconstruction of the kinematics for each event. The inclusive distribution is fairly flat at small
invariant mass of the pion pair while a small enhancement in the double differential distribution is observed for small invariant
masses of both pion pairs. Dynamical models with resonances in the final state are shown to be consistent with the data while
the stochastic HBT mechanism is not supported by the present findings.
Received: 26 February 2002 / Revised version: 22 July 2002 / Published online: 30 August 2002 相似文献
136.
137.
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
138.
For more than 25 yearsJΨ production has helped to sharpen our understanding of QCD. In proton induced reaction some observations are rather well understood
while others are still unclear. The current status of the theory ofJΨ production will be sketched, paying special attention to the issues of formation time andJΨ re-interaction in a nuclear medium. 相似文献
139.
140.
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