全文获取类型
收费全文 | 362607篇 |
免费 | 4052篇 |
国内免费 | 1785篇 |
专业分类
化学 | 195262篇 |
晶体学 | 5775篇 |
力学 | 15154篇 |
综合类 | 64篇 |
数学 | 42202篇 |
物理学 | 109987篇 |
出版年
2020年 | 2923篇 |
2019年 | 3214篇 |
2018年 | 4151篇 |
2017年 | 4251篇 |
2016年 | 6330篇 |
2015年 | 4049篇 |
2014年 | 6219篇 |
2013年 | 15498篇 |
2012年 | 12383篇 |
2011年 | 14966篇 |
2010年 | 10718篇 |
2009年 | 10572篇 |
2008年 | 14167篇 |
2007年 | 14143篇 |
2006年 | 13374篇 |
2005年 | 12116篇 |
2004年 | 10980篇 |
2003年 | 9761篇 |
2002年 | 9605篇 |
2001年 | 10838篇 |
2000年 | 8194篇 |
1999年 | 6121篇 |
1998年 | 5143篇 |
1997年 | 5031篇 |
1996年 | 4861篇 |
1995年 | 4390篇 |
1994年 | 4440篇 |
1993年 | 4257篇 |
1992年 | 4740篇 |
1991年 | 4759篇 |
1990年 | 4544篇 |
1989年 | 4417篇 |
1988年 | 4337篇 |
1987年 | 4269篇 |
1986年 | 4164篇 |
1985年 | 5477篇 |
1984年 | 5600篇 |
1983年 | 4804篇 |
1982年 | 5119篇 |
1981年 | 4766篇 |
1980年 | 4536篇 |
1979年 | 4834篇 |
1978年 | 5053篇 |
1977年 | 5022篇 |
1976年 | 5079篇 |
1975年 | 4742篇 |
1974年 | 4826篇 |
1973年 | 5024篇 |
1972年 | 3683篇 |
1971年 | 2960篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Sh. M. Khaliullin V. D. Zhuravlev V. G. Bamburov L. V. Ermakova 《Physics of Atomic Nuclei》2015,78(12):1382-1388
Submicron CaZrO3 powder is obtained in combustion reactions (solution combustion synthesis—SCS) with glycine. It is found that SCS reduces the sintering temperature of CaZrO3 powders. The dielectric properties of calcium zirconate ceramics are studied by the electrochemical impedance method. It is shown that a ceramics of powders obtained by the SCS method has high dielectric characteristics. 相似文献
52.
L. Resse L.G.S. Oliveira C.I.L. de Araujo A.R. Pereira R.L. Silva 《Physics letters. A》2019,383(14):1655-1659
In this work, we have used the MuMax3 software to simulate devices consisting of a ferromagnetic thin film placed over a heavy metal thin film. The devices are two interconnected partial-disks where a Néel domain wall is formed in the disks junction. In our simulations we investigate devices with disk radius nm and different distance d between the disks centers (from nm to nm). By applying strong sinusoidal external magnetic fields, we find a mechanism able to create, annihilate and even manipulate a skyrmion in each side of the device. This mechanism is discussed in terms of interactions between skyrmion and domain wall. The Néel domain wall formed in the center of the device interacts with the Néel skyrmion, leading to a process of transporting a skyrmion from one disk to the other periodically. Our results have relevance for potential applications in spintronics such as logical devices. 相似文献
53.
54.
55.
56.
57.
Probing the Catalytic Activity of Reduced Graphene Oxide Decorated with Au Nanoparticles Triggered by Visible Light 下载免费PDF全文
Dr. Jiale Wang Dr. Fabiane J. Trindade Caroline B. de Aquino Joana C. Pieretti Prof. Dr. Sergio H. Domingues Prof. Dr. Romulo A. Ando Prof. Dr. Pedro H. C. Camargo 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(27):9889-9894
Hybrid materials in which reduced graphene oxide (rGO) is decorated with Au nanoparticles (rGO–Au NPs) were obtained by the in situ reduction of GO and AuCl4?(aq) by ascorbic acid. On laser excitation, rGO could be oxidized as a result of the surface plasmon resonance (SPR) excitation in the Au NPs, which generates activated O2 through the transfer of SPR‐excited hot electrons to O2 molecules adsorbed from air. The SPR‐mediated catalytic oxidation of p‐aminothiophenol (PATP) to p,p′‐dimercaptoazobenzene (DMAB) was then employed as a model reaction to probe the effect of rGO as a support for Au NPs on their SPR‐mediated catalytic activities. The increased conversion of PATP to DMAB relative to individual Au NPs indicated that charge‐transfer processes from rGO to Au took place and contributed to improved SPR‐mediated activity. Since the transfer of electrons from Au to adsorbed O2 molecules is the crucial step for PATP oxidation, in addition to the SPR‐excited hot electrons of Au NPs, the transfer of electrons from rGO to Au contributed to increasing the electron density of Au above the Fermi level and thus the Au‐to‐O2 charge‐transfer process. 相似文献
58.
59.
Journal of Structural Chemistry - An analysis is presented for the results obtained in the studies initiated by A. E. Shvelashivili, Corresponding Member, Academy of Sciences of Georgia, and... 相似文献
60.