全文获取类型
收费全文 | 1943篇 |
免费 | 140篇 |
国内免费 | 1篇 |
专业分类
化学 | 1468篇 |
晶体学 | 6篇 |
力学 | 30篇 |
数学 | 216篇 |
物理学 | 364篇 |
出版年
2024年 | 8篇 |
2023年 | 23篇 |
2022年 | 67篇 |
2021年 | 82篇 |
2020年 | 73篇 |
2019年 | 106篇 |
2018年 | 107篇 |
2017年 | 79篇 |
2016年 | 131篇 |
2015年 | 92篇 |
2014年 | 102篇 |
2013年 | 138篇 |
2012年 | 134篇 |
2011年 | 162篇 |
2010年 | 94篇 |
2009年 | 68篇 |
2008年 | 108篇 |
2007年 | 100篇 |
2006年 | 104篇 |
2005年 | 82篇 |
2004年 | 59篇 |
2003年 | 48篇 |
2002年 | 43篇 |
2001年 | 16篇 |
2000年 | 11篇 |
1999年 | 12篇 |
1998年 | 4篇 |
1997年 | 6篇 |
1996年 | 5篇 |
1995年 | 5篇 |
1993年 | 3篇 |
1992年 | 6篇 |
1990年 | 2篇 |
1988年 | 1篇 |
1983年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有2084条查询结果,搜索用时 15 毫秒
181.
182.
Qingying Bu Gerard Buskes Alexey I. Popov Adi Tcaciuc Vladimir G. Troitsky 《Positivity》2013,17(2):283-298
We investigate the relationship between the diagonal of the Fremlin projective tensor product of a Banach lattice E with itself and the 2-concavification of E. 相似文献
183.
Michail I. Alymov Nikolai M. Rubtsov Boris S. Seplyarskii Victor A. Zelensky Alexey B. Ankudinov Georgii I. Tsvetkov Victor I. Chernysh 《Mendeleev Communications》2018,28(4):447-449
It was shown that the synthesis of Cu nanopowder by thermal decomposition afforded chemically purer (without oxides) and finer (specific surface value ~45 m2 g?1) product than the synthesis by chemical reduction. The latter method leads to pyrophoric nanopowders containing detectable amounts of copper oxides. 相似文献
184.
In this paper, we investigate the dynamics of systems describing the rolling without slipping and spinning (rubber rolling) of various rigid bodies on a plane and a sphere. It is shown that a hierarchy of possible types of dynamical behavior arises depending on the body’s surface geometry and mass distribution. New integrable cases and cases of existence of an invariant measure are found. In addition, these systems are used to illustrate that the existence of several nontrivial involutions in reversible dissipative systems leads to quasi-Hamiltonian behavior. 相似文献
185.
186.
187.
188.
Alexander A. Simenel Galina A. Dokuchaeva Lubov' V. Snegur Alexey N. Rodionov Mikhail M. Ilyin Svetlana I. Zykova Larissa A. Ostrovskaya Natalia V. Bluchterova Margarita M. Fomina Valentina A. Rikova 《应用有机金属化学》2011,25(1):70-75
Ferrocenylalkyl thiopyrimidines ( 6a–d to 9a–d ) were prepared via the reaction of the α‐(hydroxy)alkyl ferrocenes, FcCHR(OH) ( 1a–d ; Fc = ferrocenyl; R = H, Me, Et, Ph), with 2‐thiopyrimidines ( 2 – 5 ) in acetone at room temperature in the presence of TFA, yielding 50–95%. The resulting enantiomers were resolved using HPLC on modified cellulose as chiral selector. The antitumor activities of S‐ferrocenylethyl 2‐thiopyrimidine ( 6b ) against two murine solid tumor models, carcinoma 755 (Ca755) and Lewis lung carcinoma (LLC) were evaluated in vivo. The strong antitumor effect of compound 6b on Ca755 and LLC was demonstrated. The index of tumor growth inhibition on Ca755 equaled 95% in comparison with control. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
189.
190.