全文获取类型
收费全文 | 3675篇 |
免费 | 318篇 |
国内免费 | 326篇 |
专业分类
化学 | 88篇 |
晶体学 | 1篇 |
力学 | 195篇 |
综合类 | 95篇 |
数学 | 3661篇 |
物理学 | 279篇 |
出版年
2024年 | 5篇 |
2023年 | 47篇 |
2022年 | 54篇 |
2021年 | 78篇 |
2020年 | 112篇 |
2019年 | 116篇 |
2018年 | 102篇 |
2017年 | 121篇 |
2016年 | 112篇 |
2015年 | 110篇 |
2014年 | 179篇 |
2013年 | 273篇 |
2012年 | 175篇 |
2011年 | 204篇 |
2010年 | 194篇 |
2009年 | 234篇 |
2008年 | 254篇 |
2007年 | 215篇 |
2006年 | 227篇 |
2005年 | 209篇 |
2004年 | 161篇 |
2003年 | 164篇 |
2002年 | 170篇 |
2001年 | 130篇 |
2000年 | 101篇 |
1999年 | 98篇 |
1998年 | 91篇 |
1997年 | 85篇 |
1996年 | 59篇 |
1995年 | 42篇 |
1994年 | 38篇 |
1993年 | 15篇 |
1992年 | 15篇 |
1991年 | 18篇 |
1990年 | 11篇 |
1989年 | 9篇 |
1988年 | 4篇 |
1987年 | 13篇 |
1986年 | 4篇 |
1985年 | 13篇 |
1984年 | 14篇 |
1983年 | 8篇 |
1982年 | 5篇 |
1981年 | 3篇 |
1979年 | 3篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1973年 | 2篇 |
1936年 | 3篇 |
排序方式: 共有4319条查询结果,搜索用时 0 毫秒
61.
In the present paper, we introduce some new subclasses of meromorphic starlike,convex, close-to-convex and quasi-convex functions of β-reciprocal in terms of the linear operator using subordination. We obtain the coefficient estimates, convolution properties, integral preserving properties and inclusion relationships of the classes. The results presented here include several results as their special cases. 相似文献
62.
A macroscopic model for an intermediate state between type‐I and type‐II superconductivity 下载免费PDF全文
Karel Van Bockstal Marián Slodička 《Numerical Methods for Partial Differential Equations》2015,31(5):1551-1567
A vectorial nonlocal and nonlinear parabolic problem on a bounded domain for an intermediate state between type‐I and type‐II superconductivity is proposed. The domain is for instance a multiband superconductor that combines the characteristics of both types. The nonlocal term is represented by a (space) convolution with a singular kernel arising in Eringen's model. The nonlinearity is coming from the power law relation by Rhyner. The well‐posedness of the problem is discussed under low regularity assumptions and the error estimate for a semi‐implicit time‐discrete scheme based on backward Euler approximation is established. In the proofs, the monotonicity methods and the Minty–Browder argument are used. © 2015 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 31: 1551–1567, 2015 相似文献
63.
A local parallel superconvergence method for the incompressible flow by coarsening projection 下载免费PDF全文
In this article, we investigate a local parallel superconvergence method by coarsening projection for the incompressible Stokes flow. The method is a combination of the local superconvergence technique and the given framework of local parallel method. For the smooth subdomains, the local superconvergence method is applied in a higher order finite dimensional space corresponding to an appropriate coarse mesh on interior domain. Moreover, a useful and flexible local parallel method is designed to obtain the local parallel superconvergence results of presented method, which offset theoretical limitation of the model without the smoothness of the exact solution and a priori regularity of the underlying problem over the whole domain. © 2014 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 31: 1209–1223, 2015 相似文献
64.
1 引言
小波分析是结合泛函分析、应用数学、逼近论、调和分析、广义函数论等数学知识的结晶,具有深刻的理论意义和广泛的应用范围,被称为”数学显微镜”.基于其多分辨分析的特点以及在时、频两域都具有表征信号局部特征的功能,应用它可以解决许多Fourier变换不能解决的难题,为工程应用提供了一种新的、更有效的分析工具[1],由... 相似文献
65.
The changes in the local and global dynamics of azide-labelled lysozyme compared with that of the wild type protein are quantitatively assessed for all alanine residues along the polypeptide chain. Although attaching -N to alanine residues has been considered to be a minimally invasive change in the protein it is found that depending on the location of the alanine residue, the local and global changes in the dynamics differ. For Ala92, the change in the cross-correlated motions are minimal, whereas attaching -N to Ala90 leads to pronounced differences in the local and global correlations as quantified by the cross-correlation coefficients of the C atoms. We also demonstrate that the spectral region of the asymmetric azide stretch distinguishes between alanine attachment sites, whereas changes in the low frequency, far-infrared region are less characteristic. 相似文献
66.
67.
In this paper, a unified model for time-dependent Maxwell equations in dispersive media is considered. The space-time DG method developed in [29] is applied to solve the underlying problem. Unconditional L2-stability and error estimate of order O τr+1+ hk+1/2 are obtained when polynomials of degree at most r and k are used for the temporal discretization and spatial discretization respectively. 2-D and 3-D numerical examples are given to validate the theoretical results. Moreover, numerical results show an ultra-convergence of order 2r + 1 in temporal variable t. 相似文献
68.
研究偶数维空间带粘性的波动方程柯西问题解的逐点估计.通过对格林函数的精细分析,得到解的大时间状态.解呈现出惠更斯现象. 相似文献
69.
Let L be an elliptic operator, we give arguments about the duality estimate between Morrey spaces and its pre-dual spaces characterized by the heat kernel associated to L that is given in [6],[8]. 相似文献
70.
J. K. Ghorai 《Annals of the Institute of Statistical Mathematics》1991,43(4):747-760
The problem of estimating a smooth quantile function, Q(·), at a fixed point p, 0 < p < 1, is treated under a nonparametric smoothness condition on Q. The asymptotic relative deficiency of the sample quantile based on the maximum likelihood estimate of the survival function under the proportional hazards model with respect to kernel type estimators of the quantile is evaluated. The comparison is based on the mean square errors of the estimators. It is shown that the relative deficiency tends to infinity as the sample size, n, tends to infinity. 相似文献