全文获取类型
收费全文 | 14864篇 |
免费 | 556篇 |
国内免费 | 6篇 |
专业分类
化学 | 10903篇 |
晶体学 | 95篇 |
力学 | 265篇 |
数学 | 2004篇 |
物理学 | 2159篇 |
出版年
2023年 | 118篇 |
2022年 | 75篇 |
2021年 | 129篇 |
2020年 | 211篇 |
2019年 | 232篇 |
2018年 | 212篇 |
2017年 | 220篇 |
2016年 | 500篇 |
2015年 | 464篇 |
2014年 | 496篇 |
2013年 | 944篇 |
2012年 | 1147篇 |
2011年 | 1234篇 |
2010年 | 670篇 |
2009年 | 515篇 |
2008年 | 1079篇 |
2007年 | 1056篇 |
2006年 | 951篇 |
2005年 | 905篇 |
2004年 | 741篇 |
2003年 | 606篇 |
2002年 | 526篇 |
2001年 | 197篇 |
2000年 | 186篇 |
1999年 | 117篇 |
1998年 | 91篇 |
1997年 | 94篇 |
1996年 | 135篇 |
1995年 | 84篇 |
1994年 | 68篇 |
1993年 | 89篇 |
1992年 | 74篇 |
1991年 | 57篇 |
1990年 | 55篇 |
1989年 | 43篇 |
1988年 | 47篇 |
1987年 | 44篇 |
1986年 | 66篇 |
1985年 | 91篇 |
1984年 | 75篇 |
1983年 | 49篇 |
1982年 | 72篇 |
1981年 | 71篇 |
1980年 | 74篇 |
1979年 | 54篇 |
1978年 | 55篇 |
1977年 | 42篇 |
1976年 | 51篇 |
1975年 | 30篇 |
1974年 | 32篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
We show that the Ashtekar-Isham extension
of the configuration space of Yang-Mills theories
is (topologically and measure-theoretically) the projective limit of a family of finite dimensional spaces associated with arbitrary finite lattices.These results are then used to prove that
is contained in a zero measure subset of
with respect to the diffeomorphism invariant Ashtekar-Lewandowski measure on
. Much as in scalar field theory, this implies that states in the quantum theory associated with this measure can be realized as functions on the extended configuration space
. 相似文献
62.
63.
64.
Pochodzalla J Möhlenkamp T Rubehn T Schüttauf A Wörner A Zude E Begemann-Blaich M Blaich T Emling H Ferrero A Gross C Immé G Iori I Kunde GJ Kunze WD Lindenstruth V Lynen U Moroni A Müller WF Ocker B Raciti G Sann H Schwarz C Seidel W Serfling V Stroth J Trautmann W Trzcinski A Tucholski A Verde G Zwieglinski B 《Physical review letters》1995,75(6):1040-1043
65.
André LeClair 《Theoretical and Mathematical Physics》1994,98(3):297-305
We present a new application of affine Lie algebras to massive quantum field theory in 2 dimensions by investigating theq1 limit of theq-deformed affine
symmetry of the sine-Gordon theory, this limit occurring at the free fermion point. Working in radial quantization leads to a quasi-chiral factorization of the space of fields. The conserved charges which generate the affine Lie algebrasplit into two independent affine algebras on this factorized space, each with level 1 in the anti-periodic sector, and level 0 in the periodic sector. The space of fields in the anti-periodic sector can be organized using level-1 highest weight representations if one supplements the
algebra with the usual local integrals of motion. Introducing a particle-field duality leads to a new way of computing form-factors in radial quantization. Using the integrals of motion, a momentum space bosonization involving vertex operators is formulated. Form-factors are computed as vacuum expectation values of vertex operators in momentum space.Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 98. No. 3, pp. 430–441, March, 1994. 相似文献
66.
This paper reviews the origin of inertia according to Mach's principle and Weber's law of gravitation. The resulting theory is based on simultaneous nonlocal gravitational interactions between particles in the solar system and others in the remote universe beyond the Milky Way galaxy. It explains the precession of the perihelion of Mercury. A most important implication of the Mach-Weber theory of the force of inertia is the necessity for a large amount of uniformly distributed matter in the galactic universe. This matter could be the source of the cosmic background radiation. Nonlocal inertia forces are compatible with a static universe and also with an expanding universe but the latter would demand slow changes in the mass of particles and the gravitational constant. 相似文献
67.
68.
69.
André Draux 《Numerical Algorithms》1996,11(1):143-158
From some results concerning the formal orthogonal polynomials, already proved in [5], we develop new properties of generalized adjacent polynomials which correspond to a change in the weight function. A new structure of the singular blocks is given. These results have a direct application to Lanczos methods, theG and -algorithms. 相似文献
70.
J. Ignacio Extremiana Aldana L. Javier Herná ndez Paricio M. Teresa Rivas Rodrí guez 《Proceedings of the American Mathematical Society》1996,124(11):3545-3553
For each integer , we give a distinct closed model category structure to the category of pointed spaces such that the corresponding localized category is equivalent to the standard homotopy category of -connected CW-complexes. The structure of closed model category given by Quillen to is based on maps which induce isomorphisms on all homotopy group functors and for any choice of base point. For each , the closed model category structure given here takes as weak equivalences those maps that for the given base point induce isomorphisms on for .