全文获取类型
收费全文 | 3187篇 |
免费 | 201篇 |
国内免费 | 300篇 |
专业分类
化学 | 247篇 |
晶体学 | 3篇 |
力学 | 165篇 |
综合类 | 52篇 |
数学 | 2553篇 |
物理学 | 668篇 |
出版年
2024年 | 6篇 |
2023年 | 47篇 |
2022年 | 42篇 |
2021年 | 50篇 |
2020年 | 67篇 |
2019年 | 70篇 |
2018年 | 76篇 |
2017年 | 82篇 |
2016年 | 99篇 |
2015年 | 62篇 |
2014年 | 154篇 |
2013年 | 258篇 |
2012年 | 138篇 |
2011年 | 187篇 |
2010年 | 168篇 |
2009年 | 170篇 |
2008年 | 244篇 |
2007年 | 205篇 |
2006年 | 194篇 |
2005年 | 170篇 |
2004年 | 141篇 |
2003年 | 142篇 |
2002年 | 148篇 |
2001年 | 109篇 |
2000年 | 102篇 |
1999年 | 99篇 |
1998年 | 103篇 |
1997年 | 66篇 |
1996年 | 56篇 |
1995年 | 40篇 |
1994年 | 33篇 |
1993年 | 25篇 |
1992年 | 16篇 |
1991年 | 6篇 |
1990年 | 19篇 |
1989年 | 14篇 |
1988年 | 8篇 |
1987年 | 5篇 |
1986年 | 9篇 |
1985年 | 11篇 |
1984年 | 9篇 |
1982年 | 6篇 |
1981年 | 7篇 |
1980年 | 4篇 |
1979年 | 4篇 |
1978年 | 4篇 |
1977年 | 2篇 |
1976年 | 3篇 |
1973年 | 3篇 |
1936年 | 2篇 |
排序方式: 共有3688条查询结果,搜索用时 0 毫秒
821.
R. Balasubramanian S. Kanemitsu K. Ramachandra 《Journal of Computational and Applied Mathematics》2003,160(1-2):27-36
The aim of this paper is to extend the considerations of the first and the third authors and others to the setting of Suetuna, i.e. we consider some important sums of multiplicative ideal-functions in relative extensions of number fields. This contains most of the earlier work on those sums related to the divisor and the circle problems. 相似文献
822.
高维单形Bartos体积公式的推广 总被引:2,自引:0,他引:2
本文给出单形K维顶点角的概念,建立单形新的一类体积公式,导出单形K维顶点角的正弦定理,并获得关于单形K维顶点角的一个几何不等式. 相似文献
823.
Starting from the addition formula for q-disk polynomials, which is an identity in noncommuting variables, we establish a basic analogue in commuting variables of
the addition and product formula for disk polynomials. These contain, as limiting cases, the addition and product formula
for little q-Legendre polynomials. As q tends to 1 the addition and product formula for disk polynomials are recovered.
Date received: September 29, 1995. Date revised: May 20, 1996. 相似文献
824.
Inequalities for Edge Lengths and Volumes of Two Simplexes 总被引:2,自引:0,他引:2
Leng Gangsong 《Geometriae Dedicata》1997,68(1):43-48
In this paper, a class of geometric inequalities for the edge lengths and volumes of two n-dimensional simplexes are established. As a corollary, a generalization to several dimensions of the Neuberg–Pedoe inequality is given. 相似文献
825.
Using the heat kernel, we derive first a local Gauss–Bonnet–Chern theorem for manifolds with a non-product metric near the
boundary. Then we establish an anomaly formula for Ray–Singer metrics defined by a Hermitian metric on a flat vector bundle
over a Riemannian manifold with boundary, not assuming that the Hermitian metric on the flat vector bundle is flat nor that
the Riemannian metric has product structure near the boundary.
Received: January 2004; Revision: February 2005; Accepted: September 2005 相似文献
826.
Frank Leitenberger 《Journal of Geometry and Physics》2004,49(3-4):463-493
We define noncommutative binary forms. Using the typical representation of Hermite we prove the fundamental theorem of algebra and we derive a noncommutative Cardano formula for cubic forms. We define quantized elliptic and hyperelliptic differentials of the first kind. Following Abel we prove Abel’s theorem. 相似文献
827.
本主要探索利用Taylor公式对无穷小量的阶进行估计,从而有效地判断出二元函数极限的存在性。 相似文献
828.
In this paper, we study a class of singular Riemannian manifolds. The singular set itself is a smooth manifold with a cone-like neighborhood. By imposing a reasonable convergence condition on the metric, we can determine the local geometrical structure near the singular set. In general, the curvature near the singular set is unbounded. We prove that a bounded curvature assumption would have a strong implication on the geometrical and topological structures near the singular set. We also establish the Gauss–Bonnet–Chern formula, which can be applied to the study of singular Eistein 4-manifolds. 相似文献
829.
本文给出行列式Vn-(x1,...,xn)的准确值,它是通常的Vandermode行列式计算公式的推广,以及它在理论上的一些重要应用. 相似文献
830.
Pedro M. Lima 《Journal of Computational and Applied Mathematics》1994,50(1-3):385-400
When the finite-difference method is used to solve initial- or boundary value problems with smooth data functions, the accuracy of the numerical results may be considerably improved by acceleration techniques like Richardson extrapolation. However, the success of such a technique is doubtful in cases were the right-hand side or the coefficients of the equation are not sufficiently smooth, because the validity of an asymptotic error expansion — which is the theoretical prerequisite for the convergence analysis of the Richardson extrapolation — is not a priori obvious. In this work we show that the Richardson extrapolation may be successfully applied to the finite-difference solutions of boundary value problems for ordinary second-order linear differential equations with a nonregular right-hand side. We present some numerical results confirming our conclusions. 相似文献