全文获取类型
收费全文 | 157篇 |
免费 | 6篇 |
国内免费 | 10篇 |
专业分类
化学 | 78篇 |
力学 | 4篇 |
数学 | 46篇 |
物理学 | 45篇 |
出版年
2024年 | 1篇 |
2023年 | 1篇 |
2022年 | 6篇 |
2021年 | 1篇 |
2020年 | 8篇 |
2019年 | 3篇 |
2018年 | 7篇 |
2017年 | 5篇 |
2016年 | 6篇 |
2015年 | 4篇 |
2014年 | 7篇 |
2013年 | 16篇 |
2012年 | 5篇 |
2011年 | 14篇 |
2010年 | 5篇 |
2009年 | 8篇 |
2008年 | 10篇 |
2007年 | 5篇 |
2006年 | 9篇 |
2005年 | 11篇 |
2004年 | 2篇 |
2003年 | 1篇 |
2002年 | 2篇 |
2001年 | 4篇 |
2000年 | 6篇 |
1999年 | 2篇 |
1997年 | 4篇 |
1996年 | 2篇 |
1994年 | 6篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1977年 | 1篇 |
排序方式: 共有173条查询结果,搜索用时 125 毫秒
71.
Bogdan Batko 《Journal of Mathematical Analysis and Applications》2008,339(1):303-311
Let map an abelian semigroup (S,+) into a Banach space (X‖⋅‖). We deal with stability of the following alternative functional equation
72.
Sara Madariaga 《代数通讯》2017,45(1):183-197
In this paper, we define pre-Malcev algebras and alternative quadri-algebras and prove that they generalize pre-Lie algebras and quadri-algebras, respectively, to the alternative setting. We use the results and techniques from [4, 14] to discuss and give explicit computations of different constructions in terms of bimodules, splitting of operations, and Rota–Baxter operators. 相似文献
73.
74.
75.
Acid-catalysed cyclisations of the 2-aminoethyl styrene derivatives 9 give good to excellent yields of the corresponding tetrahydroisoquinolines 7 by an intramolecular hydroamination reaction, which represents an alternative and potentially more flexible strategy to the classical Pictet-Spengler method for the syntheses of such heterocycles. 相似文献
76.
In this article, we generalize a result about multiplicative derivations due to Daif to alternative rings. 相似文献
77.
We prove that the alternative Clifford algebra of a nondegenerate ternary quadratic form is an octonion ring whose center is the ring of polynomials in one variable over the field of definition. 相似文献
78.
79.
80.
Composite Cathode Based on Redox-Reversible Nb2TiO7 for Direct High-Temperature Steam Electrolysis
下载免费PDF全文
![点击此处可从《化学物理学报(中文版)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Ni/YSZ fuel electrodes can only operate under strongly reducing conditions for steam electrolysis in an oxide-ion-conducting solid oxide electrolyzer (SOE). In atmosphere with a low content of H2 or without H2, cathodes based on redox-reversible Nb2TiO7 provide a promising alternative. The reversible changes between oxidized Nb2TiO7 and reduced Nb1.33Ti0.67O4 samples are systematically investigated after redox-cycling tests. The conductivities of Nb2TiO7 and reduced Nb1.33Ti0.67O4 are studied as a function of temperature and oxygen partial pressure and correlated with the electrochemical properties of the composite electrodes in a symmetric cell and SOE at 830 oC. Steam electrolysis is then performed using an oxide-ion-conducting SOE based on a Nb1.33Ti0.67O4 composite fuel electrode at 830 oC. The current-voltage and impedance spectroscopy tests demonstrate that the reduction and activation of the fuel electrode is the main process at low voltage; however, the steam electrolysis dominates the entire process at high voltages. The Faradic efficiencies of steam electrolysis reach 98.9% when 3%H2O/Ar/4%H2 is introduced to the fuel electrode and 89% for that with introduction of 3%H2O/Ar. 相似文献