全文获取类型
收费全文 | 79202篇 |
免费 | 414篇 |
国内免费 | 377篇 |
专业分类
化学 | 25261篇 |
晶体学 | 796篇 |
力学 | 6729篇 |
数学 | 32041篇 |
物理学 | 15166篇 |
出版年
2022年 | 99篇 |
2021年 | 107篇 |
2020年 | 66篇 |
2019年 | 57篇 |
2018年 | 10471篇 |
2017年 | 10273篇 |
2016年 | 6144篇 |
2015年 | 889篇 |
2014年 | 359篇 |
2013年 | 408篇 |
2012年 | 3858篇 |
2011年 | 10588篇 |
2010年 | 5691篇 |
2009年 | 6085篇 |
2008年 | 6666篇 |
2007年 | 8806篇 |
2006年 | 278篇 |
2005年 | 1355篇 |
2004年 | 1568篇 |
2003年 | 1991篇 |
2002年 | 1023篇 |
2001年 | 252篇 |
2000年 | 290篇 |
1999年 | 164篇 |
1998年 | 196篇 |
1997年 | 149篇 |
1996年 | 207篇 |
1995年 | 116篇 |
1994年 | 75篇 |
1993年 | 95篇 |
1992年 | 56篇 |
1991年 | 64篇 |
1990年 | 49篇 |
1989年 | 58篇 |
1988年 | 60篇 |
1987年 | 58篇 |
1986年 | 59篇 |
1985年 | 48篇 |
1984年 | 45篇 |
1983年 | 36篇 |
1982年 | 42篇 |
1981年 | 40篇 |
1980年 | 46篇 |
1979年 | 45篇 |
1978年 | 36篇 |
1914年 | 45篇 |
1913年 | 40篇 |
1912年 | 40篇 |
1909年 | 41篇 |
1908年 | 40篇 |
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
1.
General Relativity and Gravitation - In previous work, we established theoretical results concerning the effect of matter shells surrounding a gravitational wave (GW) source, and we now apply these... 相似文献
2.
In the paper, the authors establish several integral representations for the generating functions of the large and little Schröder numbers and for the large and little Schröder numbers. 相似文献
3.
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
4.
5.
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
6.
7.
8.
9.
Prof. Dr. Francisco Melo Leonardo Caballero Esteban Zamorano Natalia Ventura Camilo Navarro Irving Doll Prof. Dr. Pedro Zamorano Prof. Dr. Alberto Cornejo 《Chemphyschem》2021,22(6):526-532
Parkinson's disease is a neurodegenerative disorder involving a functional protein, α-synuclein, whose primary function is related to vesicle trafficking. However, α-synuclein is prone to form aggregates, and these inclusions, known as Lewy bodies, are the hallmark of Parkinson's disease. α-synuclein can alter its conformation and acquire aggregating capacity, forming aggregates containing β-sheets. This protein's pathogenic importance is based on its ability to form oligomers that impair synaptic transmission and neuronal function by increasing membrane permeability and altering homeostasis, generating a deleterious effect over cells. First, we establish that oligomers interfere with the mechanical properties of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) membrane, as demonstrated by nanoindentation curves. In contrast, nanoindentation revealed that the α-synuclein monomer's presence leads to a much more resistant lipid bilayer. Moreover, the oligomers’ interaction with cell membranes can promote lactate dehydrogenase (LDH) release, suggesting the activation of cytotoxic events. 相似文献