全文获取类型
收费全文 | 11373篇 |
免费 | 811篇 |
国内免费 | 967篇 |
专业分类
化学 | 581篇 |
晶体学 | 1篇 |
力学 | 759篇 |
综合类 | 152篇 |
数学 | 9872篇 |
物理学 | 1786篇 |
出版年
2024年 | 22篇 |
2023年 | 120篇 |
2022年 | 145篇 |
2021年 | 188篇 |
2020年 | 259篇 |
2019年 | 289篇 |
2018年 | 255篇 |
2017年 | 310篇 |
2016年 | 297篇 |
2015年 | 252篇 |
2014年 | 483篇 |
2013年 | 890篇 |
2012年 | 446篇 |
2011年 | 590篇 |
2010年 | 501篇 |
2009年 | 661篇 |
2008年 | 756篇 |
2007年 | 767篇 |
2006年 | 676篇 |
2005年 | 659篇 |
2004年 | 532篇 |
2003年 | 529篇 |
2002年 | 441篇 |
2001年 | 381篇 |
2000年 | 325篇 |
1999年 | 337篇 |
1998年 | 310篇 |
1997年 | 278篇 |
1996年 | 207篇 |
1995年 | 139篇 |
1994年 | 129篇 |
1993年 | 106篇 |
1992年 | 87篇 |
1991年 | 93篇 |
1990年 | 60篇 |
1989年 | 69篇 |
1988年 | 57篇 |
1987年 | 33篇 |
1986年 | 39篇 |
1985年 | 62篇 |
1984年 | 53篇 |
1983年 | 34篇 |
1982年 | 46篇 |
1981年 | 43篇 |
1980年 | 28篇 |
1979年 | 49篇 |
1978年 | 28篇 |
1977年 | 27篇 |
1976年 | 21篇 |
1973年 | 13篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
1.
2.
《Indagationes Mathematicae》2021,32(1):55-85
We show that the differential structure of the orbit space of a proper action of a Lie group on a smooth manifold is weakly reflexive. This implies that the orbit space is a differentiable space in the sense of Smith, which ensures that the orbit space has an exterior algebra of differential forms, that satisfies Smith’s version of de Rham’s theorem. Because the orbit space is a locally closed subcartesian space, it has vector fields and their flows. 相似文献
3.
A finite support product of clones of Jensen's minimal singleton forcing is used to define a model in which any non-empty analytically definable set of reals contains an analytically definable real (the full basis theorem), but there is no analytically definable wellordering of the reals. 相似文献
4.
5.
Liang Zhao 《Journal of Differential Equations》2019,266(9):5615-5624
In this paper, let be n-dimensional noncompact metric measure space which satisfies Poincaré inequality with some Ricci curvature condition. We obtain a Liouville theorem for positive weak solutions to weighted p-Lichnerowicz equation where are real constants. 相似文献
6.
Thalia Tsiaka Panagiotis Zoumpoulakis Vassilia J. Sinanoglou Constantinos Makris Georgios A. Heropoulos Antony C. Calokerinos 《Analytica chimica acta》2015
High-energy assisted extraction techniques, like ultrasound assisted extraction (UAE) and microwave assisted extraction (MAE), are widely applied over the last years for the recovery of bioactive compounds such as carotenoids, antioxidants and phenols from foods, animals and herbal natural sources. Especially for the case of xanthophylls, the main carotenoid group of crustaceans, they can be extracted in a rapid and quantitative way with the use of UAE and MAE. 相似文献
7.
8.
In this paper, we propose a sufficient and necessary condition for the boundedness of all the solutions for the equation with the critical situation that on g and p, where , is periodic and is bounded. 相似文献
9.
The zero dissipation limit of the one-dimensional non-isentropic micropolar equations is studied in this paper. If the given rarefaction wave which connects to vacuum at one side, a sequence of solution to the micropolar equations can be constructed which converge to the above rarefaction wave with vacuum as the viscosity and the heat conduction coefficient tend to zero. Moreover, the uniform convergence rate is obtained. The key point in our analysis is how to control the degeneracies in the vacuum region in the zero dissipation limit process. 相似文献
10.