全文获取类型
收费全文 | 1768篇 |
免费 | 49篇 |
国内免费 | 6篇 |
专业分类
化学 | 1173篇 |
晶体学 | 16篇 |
力学 | 42篇 |
数学 | 199篇 |
物理学 | 393篇 |
出版年
2023年 | 14篇 |
2022年 | 40篇 |
2021年 | 32篇 |
2020年 | 34篇 |
2019年 | 40篇 |
2018年 | 32篇 |
2017年 | 32篇 |
2016年 | 67篇 |
2015年 | 44篇 |
2014年 | 66篇 |
2013年 | 89篇 |
2012年 | 86篇 |
2011年 | 108篇 |
2010年 | 59篇 |
2009年 | 53篇 |
2008年 | 82篇 |
2007年 | 64篇 |
2006年 | 71篇 |
2005年 | 60篇 |
2004年 | 48篇 |
2003年 | 39篇 |
2002年 | 41篇 |
2001年 | 29篇 |
2000年 | 24篇 |
1999年 | 18篇 |
1998年 | 20篇 |
1997年 | 25篇 |
1996年 | 24篇 |
1995年 | 19篇 |
1994年 | 32篇 |
1993年 | 26篇 |
1992年 | 22篇 |
1991年 | 22篇 |
1990年 | 25篇 |
1989年 | 22篇 |
1988年 | 17篇 |
1987年 | 27篇 |
1986年 | 15篇 |
1985年 | 23篇 |
1984年 | 16篇 |
1983年 | 20篇 |
1982年 | 15篇 |
1981年 | 10篇 |
1980年 | 18篇 |
1979年 | 20篇 |
1978年 | 19篇 |
1977年 | 13篇 |
1972年 | 17篇 |
1971年 | 11篇 |
1970年 | 9篇 |
排序方式: 共有1823条查询结果,搜索用时 0 毫秒
1.
Danilov Felix I. Bogdanov Dmytro A. Smyrnova Olena V. Korniy Sergiy A. Protsenko Vyacheslav S. 《Journal of Solid State Electrochemistry》2022,26(4):939-957
Journal of Solid State Electrochemistry - The electrochemical deposition of a nickel–iron alloy from a plating solution based on a deep eutectic solvent (a eutectic mixture of ethylene glycol... 相似文献
2.
de Santana Felipe Silva Gracioso Louise Hase Karolski Bruno dos Passos Galluzzi Baltazar Marcela Mendes Maria Anita do Nascimento Claudio Augusto Oller Perpetuo Elen Aquino 《Applied biochemistry and biotechnology》2019,189(1):103-115
Applied Biochemistry and Biotechnology - The human exposure to bisphenol A (BPA) occurs frequently. Once, this compound was one of the highest volume chemicals produced worldwide and used as a... 相似文献
3.
A synthesis of methyl 2-oxo-5-vinyl-tetrahydrofuran-3-carboxylate involving five synthetic steps from commercially available 3,4-dihydroxybutene is reported. 相似文献
4.
5.
Europium (Eu+) ions were confined in a Paul trap and detected by non-destructive method. Storage time of Eu+ ions achieved in vacuum was improved by orders of magnitude employing buffer gas cooling. The experimentally detected signal
was fitted to the ion response signal and the total number of ions trapped was estimated. It is found that the peak signal
amplitude as well as the product of FWHM and the peak signal amplitude is proportional to the total number of trapped ions.
The trapped ion secular frequency was swept at different rates and its effect on the absorption line profile was studied both
experimentally and theoretically. 相似文献
6.
R. A. Kotel’nikova G. N. Bogdanov G. V. Zotina V. S. Romanova Z. N. Parnes 《Physics of the Solid State》2002,44(3):576-577
Efficient quenching of eosin phosphorescence by amino-acid derivatives of fullerene (AADFs) such as C60-alanine and C60-glycine in aqueous solutions indicates the possibility of transferring electrons from eosin to fullerene upon collisions or in the exciplex state. To investigate electron transfer in the protein structure, we studied the process of incorporation of C60-alanine and C60-glycine into the heme pocket of myoglobin by controlling Förster quenching. The dissociation constant for the protein-AADF complex was estimated. 相似文献
7.
8.
E. A. Bogdanov A. A. Kudryavtsev L. D. Tsendin R. R. Arslanbekov V. I. Kolobov V. V. Kudryavtsev 《Technical Physics》2003,48(9):1151-1158
Comprehensive self-consistent simulations of the positive column plasma of a dc oxygen discharge are performed with the help
of commercial CFDRC software (), which enables one to carry out computations in an arbitrary 3D geometry using fluid equations for heavy components and
a kinetic equation for electrons. The main scaling laws for the spatial distributions of charged particles are determined.
These scaling laws are found to be quite different in the parameter ranges that are dominated by different physical processes.
At low pressures, both the electrons and negative ions in the inner discharge region obey a Boltzmann distribution; as a result,
a flat profile of the electron density and a parabolic profile of the ion density are established there. In the ion balance,
transport processes prevail, so that ion heating in an electric field dramatically affects the spatial distribution of the
charged particles. At elevated pressures, the volume processes prevail in the balance of negative ions and the profiles of
the charged particle densities in the inner region turn out to be similar to each other. 相似文献
9.
V. A. Dorokhov A. R. Amamchyan V. S. Bogdanov B. I. Ugrak 《Russian Chemical Bulletin》1991,40(1):222-224
A method is proposed for the synthesis of N-substituted 5-azaadenines. The condensation of N-(1,2,4-triazol-5-yl)amidines with trichloroacetonitrile gives trichloromethyl derivatives of 1,2,4-triazolo[1,5-a]-1,3,5-triazines, which are converted by the action of primary or secondary amines into N-alkylamino- or N,N-dialkylamino-1,2,4-triazolo-[1,5-a]-1,3,5-triazines (5-azaadenines).Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 1, pp. 241–243, January, 1991. 相似文献
10.