全文获取类型
收费全文 | 1820篇 |
免费 | 137篇 |
国内免费 | 187篇 |
专业分类
化学 | 1433篇 |
晶体学 | 5篇 |
力学 | 31篇 |
综合类 | 8篇 |
数学 | 187篇 |
物理学 | 480篇 |
出版年
2024年 | 25篇 |
2023年 | 62篇 |
2022年 | 100篇 |
2021年 | 55篇 |
2020年 | 37篇 |
2019年 | 38篇 |
2018年 | 37篇 |
2017年 | 37篇 |
2016年 | 43篇 |
2015年 | 41篇 |
2014年 | 79篇 |
2013年 | 54篇 |
2012年 | 129篇 |
2011年 | 175篇 |
2010年 | 74篇 |
2009年 | 65篇 |
2008年 | 130篇 |
2007年 | 154篇 |
2006年 | 157篇 |
2005年 | 115篇 |
2004年 | 51篇 |
2003年 | 46篇 |
2002年 | 63篇 |
2001年 | 55篇 |
2000年 | 54篇 |
1999年 | 64篇 |
1998年 | 38篇 |
1997年 | 11篇 |
1996年 | 25篇 |
1995年 | 16篇 |
1994年 | 21篇 |
1993年 | 30篇 |
1992年 | 21篇 |
1991年 | 14篇 |
1990年 | 10篇 |
1988年 | 2篇 |
1987年 | 1篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1961年 | 1篇 |
1956年 | 1篇 |
排序方式: 共有2144条查询结果,搜索用时 17 毫秒
1.
To test the hypothesis that the microviscosity changes of Endoplasmic Reticulum(ER) can be a useful indicator of ferroptosis promoted by ER Stresses(ERS), a new ER targeting viscosity rotor, L-Vis-1 was developed and applied in the quantitation of viscosity by FLIM imaging in live cells. The FLIM imaging exhibited an excellent resolution almost as good as the corresponding confocal imaging, more significantly, during ferroptosis processes promoted by different types of ERS, the viscosity increas... 相似文献
2.
Yi Yang Jinsong Wu Bei Cheng Liuyang Zhang Ahmed Abdullah Al-Ghamdi Swelm Wageh Youji Li 《结构化学》2022,(6):6-23
Single-atom catalysts have high catalytic activity due to their unique quantum size effects and optimal atom utilization. Herein, visiblelight-responsive photocatalysts were designed by coupling Cd S with graphene quantum dots(GQDs) and platinum single atoms(Pt SAs). GQDs and Pt SAs were successively loaded on ultrathin Cd S nanosheets through freeze-drying and in-situ photocatalytic reduction. The synergistic effect between Pt SAs and GQDs results in superior photocatalytic activity with a hydr... 相似文献
3.
4.
5.
D—AKNS族的换位表示 总被引:4,自引:0,他引:4
本文根据曹策问教授的想法,求得了与D-AKNS族发展方程相联系的特征值之泛函梯度与Lenard算子对;并由此得到了D-AKNS族非线性发展方程的换位表示。文末还讨论了换位表示与定态D-AKNS方程之间的关系. 相似文献
6.
8.
Blow Up of Solutions to Semilinear Wave Equations with Critical Exponent in High Dimensions 总被引:5,自引:2,他引:3
下载免费PDF全文
![点击此处可从《数学年刊B辑(英文版)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Yi ZHOU 《数学年刊B辑(英文版)》2007,28(2):205-212
In this paper, the author considers the Cauchy problem for semilinear wave equations with critical exponent in n≥4 space dimensions. Under some positivity conditions on the initial data, it is proved that there can be no global solutions no matter how small the initial data are. 相似文献
9.
Jun Hua YU Xue Song WANG Bao Wen ZHANG* Yi CAO Technical Institute of Physics Chemistry Chinese Academy of Sciences Beijing 《中国化学快报》2002,13(10)
Porphyrin derivatives attract much more interest in photodynamic therapy (PDT). Their importance as therapeutic drugs and targeting agents has been widely recognized1, and many of the efforts have been put towards crafting new porphyrin-based molecular entities to achieve enhanced tumor localization, better tissue penetration and increased singlet oxygen quantum yield2. The states of porphyrins in tissue models such as micelles, lipid bilayers are extensively investigated focusing more or l… 相似文献
10.
The aggregation of dansyl chloride (DNS-Cl) in acetone has been studied in detail by steady-state fluorescence techniques.It has been demonstrated that DNS-Cl is stable in acetone during purification and aggregation study processes.The aggregates are not solvolyzed in acetone,and do not take part n any chemical reactions either.It has been found that DNS-Cl tends to aggregate even when its concentration is much lower than its solubility in acetone.The aggregation is reversible,and both the aggregation and the deaggregation are very slow processes.Introduction of SDS has a positive effect upon the formation and stabilization of the aggregates. 相似文献