全文获取类型
收费全文 | 13085篇 |
免费 | 359篇 |
国内免费 | 2篇 |
专业分类
化学 | 6700篇 |
晶体学 | 86篇 |
力学 | 300篇 |
数学 | 3002篇 |
物理学 | 3358篇 |
出版年
2021年 | 103篇 |
2020年 | 150篇 |
2019年 | 145篇 |
2018年 | 260篇 |
2017年 | 253篇 |
2016年 | 485篇 |
2015年 | 403篇 |
2014年 | 472篇 |
2013年 | 978篇 |
2012年 | 613篇 |
2011年 | 812篇 |
2010年 | 473篇 |
2009年 | 406篇 |
2008年 | 572篇 |
2007年 | 530篇 |
2006年 | 464篇 |
2005年 | 289篇 |
2004年 | 302篇 |
2003年 | 250篇 |
2002年 | 254篇 |
2001年 | 194篇 |
2000年 | 198篇 |
1999年 | 160篇 |
1998年 | 149篇 |
1997年 | 137篇 |
1996年 | 130篇 |
1995年 | 119篇 |
1994年 | 106篇 |
1993年 | 113篇 |
1992年 | 128篇 |
1991年 | 107篇 |
1990年 | 127篇 |
1989年 | 109篇 |
1988年 | 112篇 |
1987年 | 107篇 |
1986年 | 101篇 |
1985年 | 151篇 |
1984年 | 165篇 |
1983年 | 128篇 |
1982年 | 139篇 |
1981年 | 131篇 |
1980年 | 130篇 |
1979年 | 139篇 |
1978年 | 152篇 |
1977年 | 115篇 |
1976年 | 142篇 |
1975年 | 129篇 |
1974年 | 132篇 |
1973年 | 105篇 |
1972年 | 90篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Separation of 23 dansylated amino acids by micellar electrokinetic chromatography at low temperature
Summary The baseline separation of 23 dansylated amino acids (including 3 didansylated species) is reported. Lowering of the analysis
temperature and fine control of the surfactant concentration were essential in obtaining this result. Calibration graphs with
good linearity were obtained. 相似文献
12.
13.
This paper attempts to develop a theory of sufficiency in the setting of non-commutative algebras parallel to the ideas in
classical mathematical statistics. Sufficiency of a coarse-graining means that all information is extracted about the mutual
relation of a given family of states. In the paper sufficient coarse-grainings are characterized in several equivalent ways
and the non-commutative analogue of the factorization theorem is obtained. As an application we discuss exponential families.
Our factorization theorem also implies two further important results, previously known only in finite Hilbert space dimension,
but proved here in generality: the Koashi-Imoto theorem on maps leaving a family of states invariant, and the characterization
of the general form of states in the equality case of strong subadditivity.
Supported by the EU Research Training Network Quantum Probability with Applications to Physics, Information Theory and Biology
and Center of Excellence SAS Physics of Information I/2/2005.
Supported by the Hungarian grant OTKA T032662 相似文献
14.
15.
Boban Marinković 《Mathematical Methods of Operations Research》2006,63(3):513-524
We present local sensitivity analysis for discrete optimal control problems with varying endpoints in the case when the customary regularity of boundary conditions can be violated. We study the behavior of the optimal solutions subject to parametric perturbations of the problem. 相似文献
16.
N. S. Simonović 《Few-Body Systems》2006,38(2-4):139-145
In agreement with the Kohn theorem the relative motion (rel) of three electrons in a two-dimensional parabolic trap separates
from the centre-of-mass (CM) motion. By introducing new coordinates the Hamiltonian for relative motion in the approximation
of non-interacting electrons can be taken to the normal form. The eigenstates of the normalized Hamiltonian are products of
the Fock-Darwin states for normal modes. The energy levels for relative motion are obtained by diagonalizing the exact Hamiltonian
in the eigenbasis for the non-interacting case. In this basis the interaction matrix elements can be obtained in the analytical
form. Since the rank of the Hamiltonian matrix is significantly reduced, the calculations are faster and more accurate than
those for the full (CM + rel) motion. This advantage is especially important for the calculations of excited states and the
analysis of energy spectra. 相似文献
17.
Lubomír Kubáček 《Applications of Mathematics》2006,51(6):565-582
Some remarks to problems of point and interval estimation, testing and problems of outliers are presented in the case of multivariate
regression model.
This work was supported by the Council of Czech Government J14/98:153100011. 相似文献
18.
Eduard Prugovečki 《Foundations of Physics》1991,21(1):93-124
The issue of the intrinsic nonlocality of quantum mechanics raised by J. S. Bell is examined from the point of view of the recently developed method of geometro-stochastic quantization and its applications to general relativistic quantum theory. This analysis reveals that a distinction should be made between the topological concept of locality used in formulating relativistic causality and a type of geometric locality based on the concept of fiber bundle, which can be used in extending the strong equivalence principle to the quantum domain. Both play an essential role in formulating a notion of geometro-stochastic propagation based on quantum diffusions, which throws new light on the EPR paradox, on the origin of the arrow of time, and on other fundamental issues in quantum cosmology and the theory of measurement. 相似文献
19.
20.
S. B. Ellis S. J. Kiehl W. S. Hughes K. Schwabe W. C. Gardiner H. L. Sanders H. Yoshimura Hanna Jablezynska-Jedrzewska J. Domański W. A. Dorfman P. Nylén Barbara Stone F. Hovorka W. C. Dearing E. Biilmann W. Kordatzki P. Wulff G. Florence A. Drilhon P. Szigeti O. Tomiček F. Poupě O. Redlich W. Stricks 《Analytical and bioanalytical chemistry》1937,111(2-4):94-104