全文获取类型
收费全文 | 154422篇 |
免费 | 884篇 |
国内免费 | 484篇 |
专业分类
化学 | 64767篇 |
晶体学 | 2043篇 |
力学 | 9947篇 |
综合类 | 1篇 |
数学 | 39526篇 |
物理学 | 39506篇 |
出版年
2021年 | 869篇 |
2020年 | 965篇 |
2019年 | 1104篇 |
2018年 | 11932篇 |
2017年 | 11854篇 |
2016年 | 8134篇 |
2015年 | 1850篇 |
2014年 | 1997篇 |
2013年 | 3555篇 |
2012年 | 6599篇 |
2011年 | 13653篇 |
2010年 | 8206篇 |
2009年 | 8584篇 |
2008年 | 9482篇 |
2007年 | 11517篇 |
2006年 | 2959篇 |
2005年 | 3695篇 |
2004年 | 3735篇 |
2003年 | 4012篇 |
2002年 | 3116篇 |
2001年 | 2469篇 |
2000年 | 1905篇 |
1999年 | 1399篇 |
1998年 | 1312篇 |
1997年 | 1176篇 |
1996年 | 1084篇 |
1995年 | 944篇 |
1994年 | 884篇 |
1993年 | 903篇 |
1992年 | 916篇 |
1991年 | 995篇 |
1990年 | 925篇 |
1989年 | 961篇 |
1988年 | 874篇 |
1987年 | 824篇 |
1986年 | 795篇 |
1985年 | 910篇 |
1984年 | 1003篇 |
1983年 | 854篇 |
1982年 | 875篇 |
1981年 | 784篇 |
1980年 | 747篇 |
1979年 | 812篇 |
1978年 | 924篇 |
1977年 | 930篇 |
1976年 | 824篇 |
1975年 | 790篇 |
1974年 | 800篇 |
1973年 | 785篇 |
1972年 | 578篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
Mesoscopic modeling at the pore scale offers great promise in exploring the underlying structure transport performance of flow through porous media. The present work studies the fluid flow subjected to capillarity-induced resonance in porous media characterized by different porous structure and wettability. The effects of porosity and wettability on the displacement behavior of the fluid flow through porous media are discussed. The results are presented in the form of temporal evolution of percentage saturation and displacement of the fluid front through porous media. The present study reveals that the vibration in the form of acoustic excitation could be significant in the mobilization of fluid through the porous media. The dependence of displacement of the fluid on physicochemical parameters like wettability of the surface, frequency along with the porosity is analyzed. It was observed that the mean displacement of the fluid is more in the case of invading fluid with wetting phase where the driving force strength is not so dominant. 相似文献
23.
24.
Sarah Peluse 《Israel Journal of Mathematics》2018,227(1):379-396
We prove that the group of diffeomorphisms of the interval [0, 1] contains surface groups whose action on (0, 1) has no global fix point and such that only countably many points of the interval (0, 1) have non-trivial stabiliser. 相似文献
25.
Novikova D. A. Flisyuk O. M. Martsulevich N. A. Garabadzhiu A. V. 《Russian Journal of General Chemistry》2021,91(7):1387-1392
Russian Journal of General Chemistry - The main sources of emissions of industrial nitrogen oxides have been reviewed. A promising method for the absorption of nitrogen monoxide by a reusable... 相似文献
26.
27.
28.
29.
Development of biocompatible porous supports is a promising strategy in the field of tissue engineering for the repair and regeneration of bone tissues with severe damage. Graphene oxide aerogels (GOAs) are excellent candidates for the manufacture of these systems due to their porosity, ability to imitate bone structure, and mechanical resistance, and according to their surface chemical reactivity, they can facilitate osseointegration, osteogenesis, osteoinduction and osteoconduction. In this review, synthesis of GOAs from the most primary source is described, and recent studies on the use of these functionalized carbonaceous foams as scaffolding for bone tissue regeneration are presented. 相似文献
30.
Journal of Experimental and Theoretical Physics - We suggest that the principle of holographic duality be extended beyond conformal invariance and AdS isometry. Such an extension is based on a... 相似文献