全文获取类型
收费全文 | 2375篇 |
免费 | 106篇 |
国内免费 | 6篇 |
专业分类
化学 | 1378篇 |
晶体学 | 45篇 |
力学 | 64篇 |
数学 | 499篇 |
物理学 | 501篇 |
出版年
2024年 | 3篇 |
2023年 | 17篇 |
2022年 | 41篇 |
2021年 | 69篇 |
2020年 | 90篇 |
2019年 | 88篇 |
2018年 | 134篇 |
2017年 | 116篇 |
2016年 | 147篇 |
2015年 | 109篇 |
2014年 | 138篇 |
2013年 | 307篇 |
2012年 | 158篇 |
2011年 | 191篇 |
2010年 | 163篇 |
2009年 | 133篇 |
2008年 | 160篇 |
2007年 | 128篇 |
2006年 | 58篇 |
2005年 | 36篇 |
2004年 | 29篇 |
2003年 | 32篇 |
2002年 | 38篇 |
2001年 | 21篇 |
2000年 | 14篇 |
1999年 | 10篇 |
1998年 | 13篇 |
1997年 | 9篇 |
1996年 | 8篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1993年 | 1篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1989年 | 2篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1985年 | 1篇 |
1983年 | 2篇 |
1981年 | 3篇 |
1979年 | 2篇 |
1972年 | 1篇 |
1936年 | 2篇 |
排序方式: 共有2487条查询结果,搜索用时 15 毫秒
81.
82.
83.
84.
85.
Identification of radical structures on 1‐pentamethylbenzyl‐3‐ethylimidazoliumsilver(I)bromide and 1,3‐bis(pentamethylbenzyl)‐4,5‐dimethylbenzimidazoliumsilver(I)bromide exposed to gamma rays: an EPR study 下载免费PDF全文
Yusuf Ceylan Keziban Usta Ahmet Kunduracioglu Ayhan Usta Bekir Cetinkaya 《Magnetic resonance in chemistry : MRC》2016,54(11):864-869
1‐Pentamethylbenzyl‐3‐ethylimidazoliumsilver(I)bromide and 1,3‐bis(pentamethylbenzyl)‐4,5dimethylbenzimidazoliumsilver(I)bromide and their Ag+ complexes were synthesized and their polycrystal forms were produced by recrystallization in dichloromethane/Et2O solvent system. Structural determinations were carried out by 1H NMR and 13C NMR with a Varian 400 NMR system using tetramethylsilane as internal standard and CDCl3 as solvent. The disappearance of acidic N‐heterocyclic carbene proton showed the formation of Ag(I) complexes. Also, elemental analyses were carried out. Electron paramagnetic resonance (EPR) measurements were performed to determine the formed radical structure on the samples irradiated at the room temperature for 72 h by using 60Co‐source with dose rate of 0.680 kGy. The EPR measurements were carried out in the temperature range of 200 K–450 K. Identical radicals were determined on the irradiated compounds. It was observed that the shapes of the spectra of the samples were independent of the temperature but, the resonance line intensities changed linearly with the temperature. Also, it was detected that the free radical on the 1‐pentamethylbenzyl‐3‐ethylimidazoliumsilver(I)bromide is not stable compared to that on the 1,3‐bis(pentamethylbenzyl)‐4,5dimethylbenzimidazoliumsilver(I)bromide. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
86.
Optical and Quantum Electronics - Numerical modelling of a Pr3+-doped chalcogenide glass fibre laser is presented in this paper. The spectroscopic parameters are extracted from in-house prepared... 相似文献
87.
88.
89.