全文获取类型
收费全文 | 1432篇 |
免费 | 85篇 |
国内免费 | 90篇 |
专业分类
化学 | 63篇 |
力学 | 170篇 |
综合类 | 30篇 |
数学 | 1065篇 |
物理学 | 279篇 |
出版年
2024年 | 2篇 |
2023年 | 8篇 |
2022年 | 15篇 |
2021年 | 19篇 |
2020年 | 20篇 |
2019年 | 25篇 |
2018年 | 31篇 |
2017年 | 30篇 |
2016年 | 36篇 |
2015年 | 26篇 |
2014年 | 72篇 |
2013年 | 100篇 |
2012年 | 65篇 |
2011年 | 69篇 |
2010年 | 49篇 |
2009年 | 67篇 |
2008年 | 91篇 |
2007年 | 92篇 |
2006年 | 89篇 |
2005年 | 91篇 |
2004年 | 61篇 |
2003年 | 70篇 |
2002年 | 54篇 |
2001年 | 48篇 |
2000年 | 34篇 |
1999年 | 33篇 |
1998年 | 36篇 |
1997年 | 30篇 |
1996年 | 38篇 |
1995年 | 13篇 |
1994年 | 14篇 |
1993年 | 14篇 |
1992年 | 21篇 |
1991年 | 17篇 |
1990年 | 14篇 |
1989年 | 11篇 |
1988年 | 9篇 |
1987年 | 10篇 |
1986年 | 11篇 |
1985年 | 14篇 |
1984年 | 10篇 |
1983年 | 8篇 |
1982年 | 6篇 |
1981年 | 7篇 |
1980年 | 5篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 5篇 |
1974年 | 3篇 |
1973年 | 2篇 |
排序方式: 共有1607条查询结果,搜索用时 31 毫秒
61.
Let M
n =X1+...+Xn be a martingale with bounded differences Xm=Mm-Mm-1 such that {|Xm| m}=1 with some nonnegative m. Write 2=
1
2
+ ... +
n
2
. We prove the inequalities {M
nx}c(1-(x/)), {M
n x} 1- c(1- (-x/)) with a constant
. The result yields sharp inequalities in some models related to the measure concentration phenomena. 相似文献
62.
S. V. Astashkin 《Mathematical Notes》1999,65(4):407-417
In this paper it is proved that from any uniformly bounded orthonormal system {f
n}
n=1
∞
of random variables defined on the probability space (Ω, ε, P), one can extract a subsystem {fni}
i
Emphasis>=1/∞
majorized in distribution by the Rademacher system on [0, 1]. This means that {
}, whereC>0 is independent of m∈N, ai∈N (i=1,…,m) andz>0.
Translated fromMatematicheskie Zametki, Vol. 65, No. 4, pp. 483–495, April, 1999. 相似文献
63.
Almost-Sure Results for a Class of Dependent Random Variables 总被引:17,自引:0,他引:17
The aim of this note is to establish almost-sure Marcinkiewicz-Zygmund type results for a class of random variables indexed by
d
+
—the positive d-dimensional lattice points—and having maximal coefficient of correlation strictly smaller than 1. The class of applications include filters of certain Gaussian sequences and Markov processes. 相似文献
64.
A sharp almost sure bound is derived for limit points of average sum of weakly dependent random variables, which ensures strong laws of large numbers for and -mixing random variables, without assumptions on rate of tending to zero of and -mixing parameters n and n. 相似文献
65.
We consider an extension of the affine scaling algorithm for linear programming problems with free variables to problems having infinitely many constraints, and explore the relationship between this algorithm and the finite affine scaling method applied to a discretization of the problem.This material is based on research supported by Air Force Office of Scientific Research Grant AFOSR 89-0410. 相似文献
66.
67.
A quantum-mechanical theory of joint nonideal measurement of incompatible polarization observables is applied to an EPR-like experiment. It is demonstrated that this experiment yields both information satisfying and information violating the Bell inequalities. The measurement is also discussed in the context of a local hidden-variables theory. It is argued that the violation of an additional assumption of reproducibility of the hidden variable rather than violation of locality may be responsible for the violation of the Bell inequalities. 相似文献
68.
Guido E del Pino 《Statistics & probability letters》1984,2(4):245-248
In this paper we consider the full rank regression model with arbitrary covariance matrix: Y = Xß + ε. It is shown that the effect of restricting the information Y to T = A′Y may be analyzed through an associatedi regression problem which is amenable to solution by two step least squares. The results are applied to the important case of missing observations, where some classical results are rederived. 相似文献
69.
This paper is concerned with large- error estimates concerning convergence in distribution as well as norm convergence for Banach space-valued martingale difference sequences. Indeed, two general limit theorems equipped with rates of convergence for such difference sequences are established. Applications of these lead to the central limit theorem and the weak law of large numbers with rates for Banach space-valued martingales. 相似文献
70.
Recent development brings new results on the interplay of states on operator algebras and axiomatics of quantum mechanics.
Neither hidden space in the sense of Kochen and Specker nor approximate hidden variables exist on von Neumann algebras. Tracial
properties of states are connected with dispersions. The axioms on composite systems simplify to state extension properties. 相似文献