全文获取类型
收费全文 | 3327篇 |
免费 | 174篇 |
国内免费 | 287篇 |
专业分类
化学 | 15篇 |
力学 | 72篇 |
综合类 | 63篇 |
数学 | 3376篇 |
物理学 | 262篇 |
出版年
2023年 | 31篇 |
2022年 | 24篇 |
2021年 | 49篇 |
2020年 | 44篇 |
2019年 | 79篇 |
2018年 | 77篇 |
2017年 | 86篇 |
2016年 | 72篇 |
2015年 | 59篇 |
2014年 | 123篇 |
2013年 | 263篇 |
2012年 | 111篇 |
2011年 | 133篇 |
2010年 | 137篇 |
2009年 | 197篇 |
2008年 | 258篇 |
2007年 | 251篇 |
2006年 | 206篇 |
2005年 | 182篇 |
2004年 | 148篇 |
2003年 | 165篇 |
2002年 | 158篇 |
2001年 | 101篇 |
2000年 | 119篇 |
1999年 | 88篇 |
1998年 | 82篇 |
1997年 | 96篇 |
1996年 | 59篇 |
1995年 | 55篇 |
1994年 | 40篇 |
1993年 | 32篇 |
1992年 | 26篇 |
1991年 | 19篇 |
1990年 | 28篇 |
1989年 | 14篇 |
1988年 | 19篇 |
1987年 | 22篇 |
1986年 | 11篇 |
1985年 | 19篇 |
1984年 | 16篇 |
1983年 | 7篇 |
1982年 | 16篇 |
1981年 | 15篇 |
1980年 | 9篇 |
1979年 | 11篇 |
1978年 | 6篇 |
1977年 | 12篇 |
1976年 | 4篇 |
1975年 | 2篇 |
1936年 | 2篇 |
排序方式: 共有3788条查询结果,搜索用时 78 毫秒
1.
Hasan Kara Muhammad Aamir Ali Hüseyin Budak 《Mathematical Methods in the Applied Sciences》2021,44(1):104-123
In this paper, we define interval‐valued left‐sided and right‐sided generalized fractional double integrals. We establish inequalities of Hermite‐Hadamard like for coordinated interval‐valued convex functions by applying our newly defined integrals. 相似文献
2.
3.
4.
K-g-框架是将算子K引入到g-框架中的一种特殊框架.采用泛函分析中的技巧和方法,研究K-g-框架的稳定性,并得到了四个K-g-框架在扰动情况下稳定的充分条件.此外,结合算子K和框架算子S衍生出K-g-框架的三个等式,并通过引入参数λ建立关于K-g-框架的一些不等式. 相似文献
5.
6.
WEI Qi-cai 《高校应用数学学报(英文版)》2015,(2):217-226
In this paper, with the aid of large deviation formulas established in strong topology of functional space generated by H¨older norm, we discuss the functional sample path properties of subsequence's C-R increments for a Wiener process in H¨older normThe obtained results,generalize the corresponding results of Chen and the classic Strassen's law of iterated logarithm for a Wiener process. 相似文献
7.
ABSTRACTThe Coupled-Cluster (CC) theory is one of the most successful high precision methods used to solve the stationary Schrödinger equation. In this article, we address the mathematical foundation of this theory with focus on the advances made in the past decade. Rather than solely relying on spectral gap assumptions (non-degeneracy of the ground state), we highlight the importance of coercivity assumptions – Gårding type inequalities – for the local uniqueness of the CC solution. Based on local strong monotonicity, different sufficient conditions for a local unique solution are suggested. One of the criteria assumes the relative smallness of the total cluster amplitudes (after possibly removing the single amplitudes) compared to the Gårding constants. In the extended CC theory the Lagrange multipliers are wave function parameters and, by means of the bivariational principle, we here derive a connection between the exact cluster amplitudes and the Lagrange multipliers. This relation might prove useful when determining the quality of a CC solution. Furthermore, the use of an Aubin–Nitsche duality type method in different CC approaches is discussed and contrasted with the bivariational principle. 相似文献
8.
Jun Jason Luo 《Mathematische Nachrichten》2019,292(5):1032-1042
Recently Lipschitz equivalence of self‐similar sets on has been studied extensively in the literature. However for self‐affine sets the problem is more awkward and there are very few results. In this paper, we introduce a w‐Lipschitz equivalence by repacing the Euclidean norm with a pseudo‐norm w. Under the open set condition, we prove that any two totally disconnected integral self‐affine sets with a common matrix are w‐Lipschitz equivalent if and only if their digit sets have equal cardinality. The main methods used are the technique of pseudo‐norm and Gromov hyperbolic graph theory on iterated function systems. 相似文献
9.
ABSTRACTIn this paper, we investigate the problem of finding a common solution to a fixed point problem involving demi-contractive operator and a variational inequality with monotone and Lipschitz continuous mapping in real Hilbert spaces. Inspired by the projection and contraction method and the hybrid descent approximation method, a new and efficient iterative method for solving the problem is introduced. Strong convergence theorem of the proposed method is established under standard and mild conditions. Our scheme generalizes and extends some of the existing results in the literature, and moreover, its computational effort is less per each iteration compared with related works. 相似文献
10.
Awatif Alqahtani Mohamed Jleli Bessem Samet 《Mathematical Methods in the Applied Sciences》2019,42(3):861-870
In this paper, some nonlocal in time differential inequalities of Sobolev type are considered. Using the nonlinear capacity method, sufficient conditions for the nonexistence of nontrivial global classical solutions are provided. 相似文献