全文获取类型
收费全文 | 1075篇 |
免费 | 213篇 |
国内免费 | 114篇 |
专业分类
化学 | 818篇 |
晶体学 | 13篇 |
力学 | 28篇 |
数学 | 66篇 |
物理学 | 477篇 |
出版年
2024年 | 1篇 |
2023年 | 31篇 |
2022年 | 26篇 |
2021年 | 41篇 |
2020年 | 61篇 |
2019年 | 55篇 |
2018年 | 40篇 |
2017年 | 38篇 |
2016年 | 56篇 |
2015年 | 67篇 |
2014年 | 68篇 |
2013年 | 81篇 |
2012年 | 105篇 |
2011年 | 104篇 |
2010年 | 76篇 |
2009年 | 59篇 |
2008年 | 71篇 |
2007年 | 64篇 |
2006年 | 51篇 |
2005年 | 40篇 |
2004年 | 32篇 |
2003年 | 29篇 |
2002年 | 23篇 |
2001年 | 18篇 |
2000年 | 11篇 |
1999年 | 18篇 |
1998年 | 16篇 |
1997年 | 22篇 |
1996年 | 17篇 |
1995年 | 7篇 |
1994年 | 11篇 |
1993年 | 13篇 |
1992年 | 11篇 |
1991年 | 6篇 |
1990年 | 6篇 |
1989年 | 7篇 |
1988年 | 1篇 |
1987年 | 4篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1980年 | 2篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1976年 | 2篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1973年 | 1篇 |
1969年 | 1篇 |
1966年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有1402条查询结果,搜索用时 15 毫秒
201.
202.
Shaohua Huang Rui Wu Zhengwu Bai Ying Yang Suying Li Xiaowei Dou 《Magnetic resonance in chemistry : MRC》2014,52(9):486-490
Polyvinylpyrrolidone (PVP) was used as a virtual stationary phase to separate p‐xylene, benzyl alcohol, and p‐methylphenol by the chromatographic NMR technique. The effects of concentration and weight‐average molecular weight (Mw) of PVP, solvent viscosity, solvent polarity, and sample temperature on the resolution of these components were investigated. It was found that both higher PVP concentration and higher PVP Mw caused the increase of diffusion resolution for the three components. Moreover, the diffusion resolution did not change at viscosity‐higher solvents. Moreover, the three components showed different resolution at different solvents. As temperature increased, the diffusion resolution between p‐xylene and benzyl alcohol gradually increased, and the one between p‐xylene and p‐methylphenol slightly increased from 278 to 298 K and then decreased above 298 K. It was also found that the polarity of the analytes played an important role for the separation by affecting the diffusion coefficient. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
203.
Dr. Mingzhe Chen Dr. Jin Xiao Dr. Weibo Hua Dr. Zhe Hu Dr. Wanlin Wang Dr. Qinfen Gu Prof. Yuxin Tang Prof. Shu-Lei Chou Prof. Hua-Kun Liu Prof. Shi-Xue Dou 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(29):12174-12181
Titanium-based polyanions have been intensively investigated for sodium-ion batteries owing to their superior structural stability and thermal safety. However, their low working potential hindered further applications. Now, a cation and anion dual doping strategy is used to boost the redox potential of Ti-based cathodes of Na3Ti0.5V0.5(PO3)3N as a new cathode material for sodium ion batteries. Both the Ti3+/Ti4+ and V3+/V4+ redox couples are reversibly accessed, leading to two distinctive voltage platforms at ca. 3.3 V and ca. 3.8 V, respectively. The remarkably improved cycling stability (86.3 %, 3000 cycles) can be ascribed to the near-zero volume strain in this unusual cubic symmetry, which has been demonstrated by in situ synchrotron-based X-ray diffraction. First-principles calculations reveal its well-interconnected 3D Na diffusion pathways with low energy barriers, and the two-sodium-extracted intermediate NaTi0.5V0.5(PO3)3N is also a stable phase according to formation energy calculations. 相似文献
204.
Qin Dou Zhao Bin Gao Diankui Xu Lizhi 《Journal of Thermal Analysis and Calorimetry》2022,147(12):6893-6900
Journal of Thermal Analysis and Calorimetry - The leakage of scroll compressor can reduce the working efficiency and cause risk, it is significant to study it in depth, thermal analysis of leakage... 相似文献
205.
206.
207.
Inside Back Cover: Developing Conjugated Polymers with High Electron Affinity by Replacing a CC Unit with a B←N Unit (Angew. Chem. Int. Ed. 12/2015)
下载免费PDF全文
![点击此处可从《Angewandte Chemie (International ed. in English)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
208.
A homopolymer based on double B ← N bridged bipyridine was reported as a novel polymer electron acceptor. The resulting all-polymer solar cells show power conversion efficiencies of 2.44%–3.04%. 相似文献
209.
A transflective polymer-stabilised blue-phase liquid display with partitioned wall-shaped electrodes
A transflective polymer-stabilised blue-phase liquid crystal display (BP-LCD) with partitioned wall-shaped electrodes is proposed. The etched polymer layer contributes to balance the optical phase retardation between transmissive (T) and reflective (R) regions. The partitioned wall-shaped electrodes generate uniform and horizontal fields throughout the entire LC layer to induce isotropic-to-anisotropic transition in the blue-phase liquid crystal medium through Kerr effect. Consequently, the accumulated phase retardation along beam path is large, resulting in reasonable low operation voltage and high transmittance both in T and R regions. This approach enables the BP-LCD to be addressed by amorphous silicon thin-film transistors. Moreover, it exhibits wide viewing angle and a well-matched gamma curve. 相似文献
210.
Shun‐Jun Ji Sai‐Nan Ni Fang Yang Jing‐Wen Shi Guo‐Lan Dou Xiao‐Yue Li Xiang‐Shan Wang Da‐Qing Shi 《Journal of heterocyclic chemistry》2008,45(3):693-702