全文获取类型
收费全文 | 110篇 |
免费 | 20篇 |
国内免费 | 54篇 |
专业分类
化学 | 88篇 |
力学 | 8篇 |
综合类 | 1篇 |
数学 | 39篇 |
物理学 | 48篇 |
出版年
2024年 | 2篇 |
2023年 | 5篇 |
2022年 | 6篇 |
2021年 | 7篇 |
2020年 | 13篇 |
2019年 | 6篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 7篇 |
2015年 | 7篇 |
2014年 | 8篇 |
2013年 | 17篇 |
2012年 | 9篇 |
2011年 | 11篇 |
2010年 | 8篇 |
2009年 | 12篇 |
2008年 | 4篇 |
2007年 | 3篇 |
2006年 | 7篇 |
2005年 | 7篇 |
2004年 | 3篇 |
2003年 | 1篇 |
2002年 | 3篇 |
2001年 | 2篇 |
2000年 | 6篇 |
1999年 | 5篇 |
1998年 | 1篇 |
1997年 | 5篇 |
1996年 | 4篇 |
1995年 | 1篇 |
1992年 | 5篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1984年 | 2篇 |
排序方式: 共有184条查询结果,搜索用时 0 毫秒
181.
Parameter identification of chaos system based on unknown parameter observer is discussed generally. Based on the work of Guan et al. [X.P. Guan, H.P. Peng, L.X. Li, et al., Acta Phys. Sinica 50 (2001) 26], the design of unknown parameter observer is improved. The application of the improved approach is extended greatly. The works in some literatures [X.P. Guan, H.P. Peng, L.X. Li, et al., Acta Phys. Sinica 50 (2001) 26; J.H. Lü, S.C. Zhang, Phys. Lett. A 286 (2001) 148; X.Q. Wu, J.A. Lu, Chaos Solitons Fractals 18 (2003) 721; J. Liu, S.H. Chen, J. Xie, Chaos Solitons Fractals 19 (2004) 533] are only the special cases of our Corollaries 1 and 2. Some observers for Lü system and a new chaos system are designed to test our improved method, and simulations results demonstrate the effectiveness and feasibility of the improved approach. 相似文献
182.
183.
Dr. Xiao Liang Prof. Wensheng Yan Yinglong Yu Kexin Zhang Wei An Prof. Hui Chen Prof. Yongcun Zou Prof. Xiao Zhao Prof. Xiaoxin Zou 《Angewandte Chemie (International ed. in English)》2023,62(46):e202311606
Improving catalytic activity without loss of catalytic stability is one of the core goals in search of low-iridium-content oxygen evolution electrocatalysts under acidic conditions. Here, we synthesize a family of 66 SrBO3 perovskite oxides (B=Ti, Ru, Ir) with different Ti : Ru : Ir atomic ratios and construct catalytic activity-stability maps over composition variation. The maps classify the multicomponent perovskites into chemical groups with distinct catalytic activity and stability for acidic oxygen evolution reaction, and highlights a chemical region where high catalytic activity and stability are achieved simultaneously at a relatively low iridium level. By quantifying the extent of hybridization of mixed transition metal 3d-4d-5d and oxygen 2p orbitals for multicomponent perovskites, we demonstrate this complex interplay between 3d-4d-5d metals and oxygen atoms in governing the trends in both activity and stability as well as in determining the catalytic mechanism involving lattice oxygen or not. 相似文献
184.
Xiaoxin Yang Qiao Zhang Yufeng Liu Mengjie Nian Min Xie Shasha Xie Qinglian Yang Prof. Dr. Suna Wang Prof. Dr. Hui Wei Prof. Dr. Jingui Duan Prof. Dr. Shengyi Dong Prof. Dr. Hang Xing 《Angewandte Chemie (International ed. in English)》2023,62(34):e202303280
Dispersing metal-organic framework (MOF) solids in stable colloids is crucial for their availability and processibility. Herein, we report a crown ether surface coordination approach for functionalizing the surface-exposed metal sites of MOF particles with amphiphilic carboxylated crown ether (CEC). The surface-bound crown ethers significantly improve MOF solvation without compromising the accessible voids. We demonstrate that CEC-coated MOFs exhibit exceptional colloidal dispersibility and stability in 11 distinct solvents and six polymer matrices with a wide range of polarities. The MOF-CEC can be instantaneously suspended in immiscible two-phase solvents as an effective phase-transfer catalyst and can form various uniform membranes with enhanced adsorption and separation performance, which highlights the effectiveness of crown ether coating. 相似文献