全文获取类型
收费全文 | 343944篇 |
免费 | 5382篇 |
国内免费 | 1178篇 |
专业分类
化学 | 189310篇 |
晶体学 | 3806篇 |
力学 | 13880篇 |
综合类 | 16篇 |
数学 | 41816篇 |
物理学 | 101676篇 |
出版年
2021年 | 2197篇 |
2020年 | 2521篇 |
2019年 | 2520篇 |
2018年 | 2579篇 |
2017年 | 2477篇 |
2016年 | 4926篇 |
2015年 | 4124篇 |
2014年 | 5455篇 |
2013年 | 15855篇 |
2012年 | 12866篇 |
2011年 | 15647篇 |
2010年 | 9583篇 |
2009年 | 9403篇 |
2008年 | 14283篇 |
2007年 | 14413篇 |
2006年 | 13899篇 |
2005年 | 13119篇 |
2004年 | 11912篇 |
2003年 | 10214篇 |
2002年 | 9718篇 |
2001年 | 10647篇 |
2000年 | 8241篇 |
1999年 | 6438篇 |
1998年 | 5156篇 |
1997年 | 5013篇 |
1996年 | 4696篇 |
1995年 | 4568篇 |
1994年 | 4322篇 |
1993年 | 4178篇 |
1992年 | 4655篇 |
1991年 | 4424篇 |
1990年 | 4092篇 |
1989年 | 3902篇 |
1988年 | 4184篇 |
1987年 | 3830篇 |
1986年 | 3772篇 |
1985年 | 5477篇 |
1984年 | 5521篇 |
1983年 | 4447篇 |
1982年 | 4863篇 |
1981年 | 4901篇 |
1980年 | 4645篇 |
1979年 | 4742篇 |
1978年 | 4769篇 |
1977年 | 4715篇 |
1976年 | 4693篇 |
1975年 | 4540篇 |
1974年 | 4428篇 |
1973年 | 4591篇 |
1972年 | 2570篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Active anodes, especially those consisting of metal mixed oxides (MMOs) containing Ru and/or Ir oxides, have been applied in the treatment of wastewater, especially when chloride ions are present. Their characteristics continuously drive the study of applications of these materials, be they in the degradation of different organic molecules, the preparation of new electrode materials and in the association of various processes to increase pollutant removal. Thus, this brief review aims to present some of the recent advances in the application of active anode materials in environmental electrochemistry. Focussing on the 2018–2020 period, it is possible to note many applied studies, using commercially available materials, covering a wide range of target pollutants. Still other studies aim to modify the catalyst surfaces to increase the mineralization capacity, and the use of these anodes in the production of free chlorine species to mediate indirect organic reduction is observed. 相似文献
82.
Ben Jadi S. El Guerraf A. Bazzaoui E.A. Wang R. Martins J.I. Bazzaoui M. 《Journal of Solid State Electrochemistry》2019,23(8):2423-2433
Journal of Solid State Electrochemistry - Due to their distinctive chemical, electronic, and environmental properties, polypyrrole is used as a blocking barrier for methanol leakage in direct... 相似文献
83.
Kounta Moussa Dawson Nathan J. 《Methodology and Computing in Applied Probability》2021,23(3):1155-1172
Methodology and Computing in Applied Probability - The problem of optimally controlling one-dimensional diffusion processes until they enter a given stopping set is extended to include Markov... 相似文献
84.
85.
Application of TiO2-nanotubes/PbO2 as an anode for the electrochemical elimination of Acid Red 1 dye
Santos José Eudes L. de Moura Dayanne Chianca da Silva Djalma Ribeiro Panizza Marco Martínez-Huitle Carlos A. 《Journal of Solid State Electrochemistry》2019,23(2):351-360
Journal of Solid State Electrochemistry - In this study, galvanostatic electrolysis, through the use of the platinum supported on Ti (Ti/Pt) and Ti/TiO2-nanotubes/PbO2 anodes, was conducted in an... 相似文献
86.
Ding Q. Yao M. Wu Sh. Zeng M. Xue N. Wu D. Xu J. 《Journal of Applied Spectroscopy》2022,89(4):712-718
Journal of Applied Spectroscopy - Based on partial least squares (PLS) analysis, the effects of different smoothing points and different preprocessing methods on the accuracy and precision of the... 相似文献
87.
Transport in Porous Media - The theme of coupling problems for adsorption, absorption and thermochemical transport in porous media is very important for engineering applications. Based on the... 相似文献
88.
It is known that under resonance conditions, a group of strongly interacting bosonic atoms, trapped in a double-well potential, mimics a single particle, performing Rabi oscillations between the wells. By implication, all atoms need to tunnel at roughly the same time, even though the Bose–Hubbard Hamiltonian accounts only for one-atom-at-a-time transfers. The mechanism of this collective behavior is analyzed, the Rabi frequencies in the process are evaluated, and the limitation of this simple picture is discussed. In particular, it is shown that the small rapid oscillations superimposed on the slow Rabi cycle result from splitting the transferred cluster at the sudden onset of tunnelling, and disappear if tunnelling is turned on gradually. 相似文献
89.
90.