全文获取类型
收费全文 | 20029篇 |
免费 | 2222篇 |
国内免费 | 2026篇 |
专业分类
化学 | 2207篇 |
晶体学 | 30篇 |
力学 | 1744篇 |
综合类 | 505篇 |
数学 | 13841篇 |
物理学 | 5950篇 |
出版年
2024年 | 15篇 |
2023年 | 157篇 |
2022年 | 243篇 |
2021年 | 348篇 |
2020年 | 406篇 |
2019年 | 420篇 |
2018年 | 444篇 |
2017年 | 572篇 |
2016年 | 648篇 |
2015年 | 500篇 |
2014年 | 1026篇 |
2013年 | 1275篇 |
2012年 | 1055篇 |
2011年 | 1269篇 |
2010年 | 1129篇 |
2009年 | 1405篇 |
2008年 | 1361篇 |
2007年 | 1459篇 |
2006年 | 1292篇 |
2005年 | 1239篇 |
2004年 | 1011篇 |
2003年 | 917篇 |
2002年 | 778篇 |
2001年 | 719篇 |
2000年 | 664篇 |
1999年 | 569篇 |
1998年 | 492篇 |
1997年 | 469篇 |
1996年 | 349篇 |
1995年 | 291篇 |
1994年 | 246篇 |
1993年 | 184篇 |
1992年 | 157篇 |
1991年 | 131篇 |
1990年 | 138篇 |
1989年 | 91篇 |
1988年 | 88篇 |
1987年 | 82篇 |
1986年 | 69篇 |
1985年 | 86篇 |
1984年 | 69篇 |
1983年 | 46篇 |
1982年 | 64篇 |
1981年 | 61篇 |
1980年 | 39篇 |
1979年 | 35篇 |
1978年 | 31篇 |
1977年 | 28篇 |
1976年 | 30篇 |
1973年 | 21篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Alexander Postnikov Boris Shapiro 《Transactions of the American Mathematical Society》2004,356(8):3109-3142
For a graph , we construct two algebras whose dimensions are both equal to the number of spanning trees of . One of these algebras is the quotient of the polynomial ring modulo certain monomial ideal, while the other is the quotient of the polynomial ring modulo certain powers of linear forms. We describe the set of monomials that forms a linear basis in each of these two algebras. The basis elements correspond to -parking functions that naturally came up in the abelian sandpile model. These ideals are instances of the general class of monotone monomial ideals and their deformations. We show that the Hilbert series of a monotone monomial ideal is always bounded by the Hilbert series of its deformation. Then we define an even more general class of monomial ideals associated with posets and construct free resolutions for these ideals. In some cases these resolutions coincide with Scarf resolutions. We prove several formulas for Hilbert series of monotone monomial ideals and investigate when they are equal to Hilbert series of deformations. In the appendix we discuss the abelian sandpile model.
992.
Kathleen Hoornaert 《Transactions of the American Mathematical Society》2004,356(5):1751-1779
In this paper we examine when the order of a pole of Igusa's local zeta function associated to a polynomial is smaller than ``expected'. We carry out this study in the case that is sufficiently non-degenerate with respect to its Newton polyhedron , and the main result of this paper is a proof of one of the conjectures of Denef and Sargos. Our technique consists in reducing our question about the polynomial to the same question about polynomials , where are faces of depending on the examined pole and is obtained from by throwing away all monomials of whose exponents do not belong to . Secondly, we obtain a formula for Igusa's local zeta function associated to a polynomial , with unstable, which shows that, in this case, the upperbound for the order of the examined pole is obviously smaller than ``expected'.
993.
Buldygin Valery Utzet Frederic Zaiats Vladimir 《Statistical Inference for Stochastic Processes》2004,7(1):1-34
The problem of estimation of an unknown response function of a time-invariant continuous linear system is considered. Discrete-time sample input–output cross-correlograms are taken as estimates of the response function. The inputs are supposed to be zero-mean stationary Gaussian processes close, in some sense, to a white noise. Both asymptotic normality of finite-dimensional distributions of the estimates and their asymptotic normality in spaces of continuous functions are studied. Our basic tool is a new integral representation for cumulants of the estimate as a finite sum of integrals involving cyclic products of kernels. Some inequalities for these integrals are obtained and their asymptotic behaviour is studied. 相似文献
994.
Abstract
We give a linear symmetric differential operator L defined by
in the 2π-periodic function space, and study the inverse-definiteness property of L. We obtain a complete result about the inverse-definiteness property of L with real constants a and b when b
2-4a > 0 and a - bk
2 + k
4 ≠ 0 for any k ∈? {1, 2, 3, . . . }.
Supported by GNAFACNR and the Natural Science Foundation of China and Jiangsu Provincial Education Commission 相似文献
995.
XinRongMA 《数学学报(英文版)》2004,20(1):157-162
In two centuries ago,Ming Autu discovered the famous Catalan numbers while he tried to expand the function sin(2px) as power series of sin(x) for the case p=1,2,3.Very recently,P.J.Larcombe shows that for any p,sin(2px) can always be expressed as an infinite power series of sin(x) involving precise combinations of Catalan numbers as part of all but the initial p terms and gave all expansions for the case p=4,5.The present paper presents the desired expansion for arbitrary integer p. 相似文献
996.
BaoQiangWU 《数学学报(英文版)》2004,20(1):71-80
In this paper,we study the infinity behavior of the bounded subharmonic functions on a Ricci non-negative Riemannian manifold M.We first show that limr→∞r^2/V(r)∫B(r)△hdv=0if h is a bounded subharmonic function.If we further assume that the Laplacian decays pointwisely faster than quadratically we show that h approaches its supremun pointwisely at infinity,under certain auxiliary conditions on the volume growth of M.In particular,our result applies to the case when the Riemannian manifold has maximum volume growth.We also derive a representation formula in our paper,from which one can easily derive Yau‘s Liouville theorem on bounded harmonic functions. 相似文献
997.
S.?IzumiyaEmail author D.?Pei M.?C.?Romero-Fuster M.?Takahashi 《Bulletin of the Brazilian Mathematical Society》2004,35(2):177-198
We introduce the notion of horospherical ridges for submanifolds of codimension 2 in hyperbolic n-space, and study some of their properties.*Work partially supported by DGCYT grant no. BFM2003-02037. 相似文献
998.
A new technique for the identification of ultrasonic flaw signals using deconvolution 总被引:1,自引:0,他引:1
The identification of ultrasonic flaw signals is a difficult task in the angle beam ultrasonic testing of welded joints due to the presence of non-relevant signals from the geometric reflectors such as weld-roots and counter-bores. This paper describes a new approach to identify ultrasonic flaw signals in such a problematic situation. A similarity function is defined as the deconvolution of a target signal by a reference signal. The similarity functions for the same type of flaws/references are symmetric bandlimited impulse-like patterns with larger amplitudes while those for different types of flaws/references are asymmetrical broad patterns with relatively smaller amplitudes. Therefore, ultrasonic signals could be identified by the pattern of the similarity function. In the initial experiments, the proposed technique showed great potential for identifying ultrasonic flaw signals in the inspection of weld joints. 相似文献
999.
Neural Network Models for Finline Discontinuities 总被引:1,自引:0,他引:1
The radial basis network is used as the finline discontinuities electromagnetic artifical neural network(EMANN) models. EM software analysis is employed to characterize finline discontinuities. EMANN models are then trained using physical parameters and frequency as inputs and equivalent electric circuit element parameters of finline discontinuities as outputs. Once trained , the EMANN models can simulate equivalent electric circuit element parameters of finline step, notch and strip very fast and efficiently. 相似文献
1000.
Let (M, g) be a pseudo-Riemannian manifold and
the space of densities of degree on M. Denote
the space of differential operators from
to
of order k and S
k
with = – the corresponding space of symbols. We construct (the unique) conformally invariant quantization map
. This result generalizes that of Duval and Ovsienko. 相似文献