全文获取类型
收费全文 | 1347篇 |
免费 | 30篇 |
国内免费 | 14篇 |
专业分类
化学 | 792篇 |
晶体学 | 6篇 |
力学 | 43篇 |
数学 | 326篇 |
物理学 | 224篇 |
出版年
2023年 | 5篇 |
2022年 | 13篇 |
2021年 | 14篇 |
2020年 | 22篇 |
2019年 | 12篇 |
2018年 | 28篇 |
2017年 | 24篇 |
2016年 | 48篇 |
2015年 | 54篇 |
2014年 | 40篇 |
2013年 | 90篇 |
2012年 | 76篇 |
2011年 | 99篇 |
2010年 | 80篇 |
2009年 | 50篇 |
2008年 | 79篇 |
2007年 | 80篇 |
2006年 | 50篇 |
2005年 | 53篇 |
2004年 | 60篇 |
2003年 | 35篇 |
2002年 | 43篇 |
2001年 | 21篇 |
2000年 | 31篇 |
1999年 | 17篇 |
1998年 | 14篇 |
1997年 | 14篇 |
1996年 | 13篇 |
1995年 | 10篇 |
1994年 | 7篇 |
1993年 | 10篇 |
1992年 | 8篇 |
1991年 | 8篇 |
1990年 | 5篇 |
1984年 | 10篇 |
1983年 | 7篇 |
1981年 | 9篇 |
1980年 | 6篇 |
1978年 | 7篇 |
1977年 | 7篇 |
1975年 | 4篇 |
1974年 | 5篇 |
1966年 | 6篇 |
1965年 | 4篇 |
1962年 | 6篇 |
1959年 | 7篇 |
1958年 | 7篇 |
1957年 | 22篇 |
1956年 | 13篇 |
1955年 | 15篇 |
排序方式: 共有1391条查询结果,搜索用时 31 毫秒
991.
Miroslav Pardy 《International Journal of Theoretical Physics》2008,47(12):3273-3281
We discuss the two-slit experiment and the Aharonov-Bohm (AB) experiment in the magnetic field. In such a case the electron
moving in the magnetic field produces so called synchrotron radiation. In other words the photons are emitted from the points
of the electron trajectory and it means that the trajectory of electron is visible in the synchrotron radiation spectrum.
The axiomatic system of quantum mechanics does not enable to define the trajectory of the elementary particle. The two-slit
experiment and AB experiment in a magnetic field was never performed and it means that they are the missing experiments of
quantum mechanics. The extension of the discussion to the cosmical rays moving in the magnetic field of the Saturn magnetosphere
and its rings is mentioned. It is related to the probe CASSINI. The solution of the problem in the framework of the hydrodynamical
model of quantum mechanics and the nonlinear quantum mechanics is also mentioned. 相似文献
992.
Maria Nowak Miroslav Pavlovi? 《Journal of Mathematical Analysis and Applications》2010,370(2):588-599
We show that the Libera operator, L, on some spaces of analytic functions is a continuous extension of the conjugate of the Cesàro operator. Results on L acting on various spaces are obtained. In particular, L maps the Bloch space into BMOA. We also prove some results on the best approximation by polynomials in Hardy and Bergman spaces. 相似文献
993.
994.
Agnieszka Kaamajska Miroslav Krbec 《Journal of Mathematical Analysis and Applications》2010,362(2):460-470
We consider a triple of N-functions (M,H,J) that satisfy the Δ′-condition, and suppose that an additive variant of interpolation inequality holds where , is an arbitrary set invariant with respect to external and internal dilations. We show that the above inequality implies its certain nonlinear variant involving the expressions and . Various generalizations of this inequality to the more general class of N-functions, measures and to higher order derivatives are also discussed and the examples are presented. 相似文献
995.
We compute the Szegö kernels of the unit circle bundles of homogeneous negative line bundles over a compact Hermitian symmetric space. We prove that their logarithmic terms vanish in all cases and, further, that the circle bundles are not diffeomorphic to the unit sphere in ${\mathbb C^n}We compute the Szeg? kernels of the unit circle bundles of homogeneous negative line bundles over a compact Hermitian symmetric
space. We prove that their logarithmic terms vanish in all cases and, further, that the circle bundles are not diffeomorphic
to the unit sphere in
\mathbb Cn{\mathbb C^n} for Grassmannian manifolds of higher ranks. In particular, they provide an infinite family of smoothly bounded strictly pseudoconvex
domains on complex manifolds for which the logarithmic term in the Fefferman expansion of the Szeg? kernel vanishes but whose
boundary is not diffeomorphic to the sphere (in fact, it is not even locally spherical). The analogous results for the Bergman
kernel are also obtained. 相似文献
996.
Miodrag M. Spalevi? Miroslav S. Prani? 《Journal of Computational and Applied Mathematics》2010,234(4):1049-5756
We study the kernel of the remainder term of Gauss quadrature rules for analytic functions with respect to one class of Bernstein-Szegö weight functions. The location on the elliptic contours where the modulus of the kernel attains its maximum value is investigated. This leads to effective error bounds of the corresponding Gauss quadratures. 相似文献
997.
We study the magnetic properties of the erbium based compounds, Na[Er(WO)] and [(Pc)Er{Pc{N(CH)}}], in the framework of an effective spin exchange model involving delocalized electrons occupying molecular orbitals. The calculations successfully reproduce the experimental data available in the literature for the magnetic spectrum, magnetization and molar susceptibility in dc and ac fields. Owing to their similar molecular geometry, the compounds’ magnetic behaviors are interpreted in terms of the same set of active orbitals and thus the same effective spin coupling scheme. For all three complexes, the model predicts a prompt change in the ground state from a Kramer’s doublet at zero fields to a fully polarized quartet one brought about by the action of an external magnetic field without Zeeman splitting. This alteration is attributed to the enhancement of the effect of orbital interactions over the spin exchange as the magnitude of the external magnetic field increases. 相似文献
998.
We present theoretical study of morphology of Fe islands grown at Mo(110) surface in submonolayer MBE mode. We utilize atomistic
SOS model with bond counting, and interactions of Fe adatom up to third nearest neighbors. We performed KMC simulations for
different values of adatom interactions and varying temperatures. We have found that, while for the low temperature islands
are fat fractals, for the temperature 500 K islands have faceted rhombic-like shape. For the higher temperature, islands acquire
a rounded shape. In order to evaluate qualitatively morphological changes, we measured average aspect ratio of islands. We
calculated dependence of the average aspect ratio on the temperature, and on the strength of interactions of an adatom with
neighbors.
相似文献
999.
Miroslav Pavlovic 《Proceedings of the American Mathematical Society》2006,134(12):3625-3627
A very short proof is given of the inequality where and is the Poisson integral of
1000.
Nada Kouti‐Hulita Miroslav
egarac 《Acta Crystallographica. Section C, Structural Chemistry》2005,61(3):o171-o173
In the crystal structure of (R)‐N,N‐diisopropyl‐3‐(2‐hydroxy‐5‐methylphenyl)‐3‐phenylpropylaminium (2R,3R)‐hydrogen tartrate, C22H32NO+·C4H5O6−, the hydrogen tartrate anions are linked by O—H⋯O hydrogen bonds to form helical chains built from (9) rings. These chains are linked by the tolterodine molecules via N—H⋯O and O—H⋯O hydrogen bonds to form separate sheets parallel to the (101) plane. 相似文献