全文获取类型
收费全文 | 1277篇 |
免费 | 35篇 |
国内免费 | 87篇 |
专业分类
化学 | 5篇 |
晶体学 | 1篇 |
力学 | 20篇 |
综合类 | 16篇 |
数学 | 1152篇 |
物理学 | 205篇 |
出版年
2024年 | 3篇 |
2023年 | 11篇 |
2022年 | 17篇 |
2021年 | 9篇 |
2020年 | 15篇 |
2019年 | 19篇 |
2018年 | 25篇 |
2017年 | 27篇 |
2016年 | 21篇 |
2015年 | 11篇 |
2014年 | 27篇 |
2013年 | 101篇 |
2012年 | 66篇 |
2011年 | 53篇 |
2010年 | 37篇 |
2009年 | 70篇 |
2008年 | 81篇 |
2007年 | 78篇 |
2006年 | 72篇 |
2005年 | 55篇 |
2004年 | 52篇 |
2003年 | 43篇 |
2002年 | 50篇 |
2001年 | 48篇 |
2000年 | 50篇 |
1999年 | 43篇 |
1998年 | 33篇 |
1997年 | 30篇 |
1996年 | 26篇 |
1995年 | 16篇 |
1994年 | 21篇 |
1993年 | 18篇 |
1992年 | 20篇 |
1991年 | 15篇 |
1990年 | 13篇 |
1989年 | 10篇 |
1988年 | 13篇 |
1987年 | 15篇 |
1986年 | 10篇 |
1985年 | 9篇 |
1984年 | 7篇 |
1983年 | 3篇 |
1982年 | 11篇 |
1981年 | 8篇 |
1980年 | 10篇 |
1979年 | 3篇 |
1978年 | 12篇 |
1977年 | 3篇 |
1976年 | 5篇 |
1974年 | 3篇 |
排序方式: 共有1399条查询结果,搜索用时 15 毫秒
81.
A nonsmooth Lipschitz vector optimization problem (VP) is considered. Using the Fritz John type necessary optimality conditions for (VP), we formulate the Mond–Weir dual problem (VD) and establish duality theorems for (VP) and (VD) under (strict) pseudoinvexity assumptions on the functions. Our duality theorems do not require a constraint qualification. 相似文献
82.
《Operations Research Letters》2021,49(1):121-128
This paper expands the notion of robust profit opportunities in financial markets to incorporate distributional ambiguity using Wasserstein distance as the ambiguity measure. Financial markets with risky and risk-free assets are considered. The infinite dimensional primal problems are formulated, leading to their simpler finite dimensional dual problems. A principal motivating question is how distributional ambiguity helps or hurts the robustness of the profit opportunity. Towards answering this question, some theory is developed and computational experiments are conducted. Finally some open questions and suggestions for future research are discussed. 相似文献
83.
84.
We show a Lagrange-type duality theorem for a DC programming problem, which is a generalization of previous results by J.-E. Martínez-Legaz, M. Volle [5] and Y. Fujiwara, D. Kuroiwa [1] when all constraint functions are real-valued. To the purpose, we decompose the DC programming problem into certain infinite convex programming problems. 相似文献
85.
In this paper, we consider hypersurfaces in the unit lightlike sphere. The unit sphere can be canonically embedded in the lightcone and de Sitter space in Minkowski space. We investigate these hypersurfaces in the framework of the theory of Legendrian dualities between pseudo‐spheres in Minkowski space. 相似文献
87.
88.
Arjun Berera 《Contemporary Physics》2013,54(1):33-49
In the past decade, the importance of dissipation and fluctuation to inflationary dynamics has been realized and has led to a new picture of inflation called warm inflation. Although these phenomena are common to condensed matter systems, for inflation models their importance has only recently started to be appreciated. The article describes the motivation for these phenomena during inflation and then examines their origins from first principles quantum field theory treatments of inflation models. Cosmology today is a data intensive field and this is driving theory to greater precision and predictability. This opens the possibility to consider tests for detecting observational signatures of dissipative processes, which will be discussed. In addition, it will be discussed how particle physics and cosmology are now working in tandem to push the boundaries of our knowledge about fundamental physics. 相似文献
89.
90.
In this paper we generalize the concept of a Dini-convex function with Dini derivative and introduce a new concept - Dini-invexity. Some properties of Dini invex functions are discussed. On the base of this, we study the Wolfe type duality and Mond-Weir type duality for Dini-invex nonsmooth multiobjective programmings and obtain corresponding duality theorems. 相似文献