全文获取类型
收费全文 | 2311篇 |
免费 | 127篇 |
国内免费 | 3篇 |
专业分类
化学 | 1706篇 |
晶体学 | 11篇 |
力学 | 44篇 |
数学 | 185篇 |
物理学 | 495篇 |
出版年
2024年 | 8篇 |
2023年 | 20篇 |
2022年 | 50篇 |
2021年 | 98篇 |
2020年 | 79篇 |
2019年 | 111篇 |
2018年 | 109篇 |
2017年 | 83篇 |
2016年 | 111篇 |
2015年 | 98篇 |
2014年 | 103篇 |
2013年 | 125篇 |
2012年 | 186篇 |
2011年 | 195篇 |
2010年 | 126篇 |
2009年 | 74篇 |
2008年 | 128篇 |
2007年 | 139篇 |
2006年 | 143篇 |
2005年 | 123篇 |
2004年 | 95篇 |
2003年 | 58篇 |
2002年 | 56篇 |
2001年 | 19篇 |
2000年 | 10篇 |
1999年 | 9篇 |
1998年 | 11篇 |
1997年 | 9篇 |
1996年 | 14篇 |
1995年 | 2篇 |
1994年 | 11篇 |
1993年 | 8篇 |
1992年 | 7篇 |
1991年 | 3篇 |
1990年 | 3篇 |
1989年 | 5篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1985年 | 4篇 |
1983年 | 1篇 |
1981年 | 2篇 |
1977年 | 2篇 |
1976年 | 1篇 |
排序方式: 共有2441条查询结果,搜索用时 31 毫秒
81.
Alexey V. Laptev Dmitrii E. Pugachev Alexey Yu. Lukin Andrei V. Nechaev Nikolay E. Belikov Olga V. Demina Petr P. Levin Andrey A. Khodonov Andrey F. Mironov Sergei D. Varfolomeev Vitalii I. Shvets 《Mendeleev Communications》2013,23(4):199-201
A new 5,10,15,20-tetrasubstituted porphyrin containing four 6’-nitro-1,3,3-trimethylspiro(indolino-2,2’-2H-chromene) substituents and its complexes with Zn2+ and Cu2+ ions were prepared and characterized by physicochemical methods of analysis. 相似文献
82.
Andrey V. Galukhin Elena A. Andreyko Ildar H. Rizvanov Ivan I. Stoikov 《Mendeleev Communications》2013,23(4):196-198
Pentakis-thiacalix[4]arenes containing thiacalix[4]arene fragments in cone, partial cone and 1,3-alternate conformations as their central core have been obtained. Their interaction with cations of s- and d-metals gives supramolecular assemblies whose composition depends on the conformation of pentakis-thiacalix[4]arenes and the nature of the ‘guests’. 相似文献
83.
84.
Dr. Sergiy V. Zasukha Prof. Dr. Vadim M. Timoshenko Prof. Dr. Andrey A. Tolmachev Valentyna O. Pivnytska Oleksii Gavrylenko Dr. Serhii Zhersh Prof. Dr. Yuriy Shermolovich Dr. Oleksandr O. Grygorenko 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(28):6928-6940
Two novel solid reagents—1-sulfonimidoyl- and 1-sulfamimidoyl-3-methylimidazolium derivatives—for the synthesis of sulfonimidamides and imidosulfuric diamides, respectively, were developed. It is shown that these reagents are very effective in substitution reactions with various N- and O-nucleophiles; therefore, they significantly extend the accessibility to the chemical space covered by organosulfur(VI) compounds with S=N bonds. In addition, previously unknown imidosulfuric diamides with free imino nitrogen groups were prepared, and their physical and chemical properties were characterized (including molecular geometry, pKa, Log P, microsomal stability, and reactivity towards typical electrophiles). Similar to other organosulfur(VI) derivatives with S=N bonds, these compounds can be considered as promising bioisosteres of amides, ureas, or sulfonamides. 相似文献
85.
86.
87.
88.
89.
A systematic study of glycopeptide esterification for the semi‐quantitative determination of sialylation in antibodies
下载免费PDF全文
![点击此处可从《Rapid communications in mass spectrometry : RCM》网站下载免费的PDF全文](/ch/ext_images/free.gif)
90.
Sergey A. Nazarov Andrey S. Slutskij Jari Taskinen 《Mathematical Methods in the Applied Sciences》2014,37(16):2463-2483
We consider an elastic rod with rounded ends and diameter proportional to a small parameter h > 0. The roundness of the ends is described by an exponent m ∈ (0,1). We derive for the rod an asymptotically sharp Korn inequality with a special weighted anisotropic norm. Weight factors with m‐dependent powers of h appear both in the anisotropic norm and the Korn inequality itself, and we discover three critical values m = 1 ∕ 4, m = 1 ∕ 2 and m = 3 ∕ 4 at which these exponents are crucially changed. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献