全文获取类型
收费全文 | 760篇 |
免费 | 27篇 |
国内免费 | 1篇 |
专业分类
化学 | 613篇 |
晶体学 | 2篇 |
力学 | 3篇 |
数学 | 69篇 |
物理学 | 101篇 |
出版年
2023年 | 7篇 |
2022年 | 5篇 |
2021年 | 13篇 |
2020年 | 11篇 |
2019年 | 18篇 |
2018年 | 4篇 |
2017年 | 6篇 |
2016年 | 19篇 |
2015年 | 15篇 |
2014年 | 30篇 |
2013年 | 23篇 |
2012年 | 51篇 |
2011年 | 59篇 |
2010年 | 28篇 |
2009年 | 37篇 |
2008年 | 52篇 |
2007年 | 45篇 |
2006年 | 47篇 |
2005年 | 32篇 |
2004年 | 38篇 |
2003年 | 25篇 |
2002年 | 23篇 |
2001年 | 16篇 |
2000年 | 17篇 |
1999年 | 7篇 |
1998年 | 4篇 |
1997年 | 12篇 |
1996年 | 9篇 |
1995年 | 8篇 |
1994年 | 4篇 |
1993年 | 4篇 |
1992年 | 12篇 |
1991年 | 4篇 |
1989年 | 4篇 |
1987年 | 4篇 |
1986年 | 5篇 |
1985年 | 4篇 |
1983年 | 9篇 |
1980年 | 7篇 |
1979年 | 4篇 |
1978年 | 5篇 |
1976年 | 8篇 |
1975年 | 4篇 |
1974年 | 4篇 |
1971年 | 3篇 |
1970年 | 4篇 |
1969年 | 4篇 |
1966年 | 3篇 |
1964年 | 3篇 |
1957年 | 3篇 |
排序方式: 共有788条查询结果,搜索用时 15 毫秒
51.
Guillermo A. BlancoMaria T. Baumgartner 《Tetrahedron letters》2011,52(52):7061-7063
The sulfenylation of nitroalkanes and hydroxyaryls in DMSO using aryl disulfides as sulfenylating reagents was studied. The corresponding arylthionitroalkanes and arylthiohydroxyaryls were obtained in moderate to good yields in very mild conditions, thus improving the reported procedures for the synthesis of these compounds. 相似文献
52.
Dimitrios A. Lamprou James R. Smith Thomas G. Nevell Eugen Barbu Corinne Stone Colin R. Willis Richard J. Ewen John Tsibouklis 《Surface science》2010,604(5-6):541-547
Self-assembled structures of alkanethiols that have been deposited on gold from ethanolic solutions are susceptible to both chemical and physical changes: ethanol provides a medium for the formation of S-alkyl hydrogen thiocarbonates and related compounds via reaction with dissolved, atmospheric, CO2. Deposition from ethanolic solutions results in multilayered structures incorporating these compounds, which at room temperature are susceptible to time-dependent structural rearrangement and molecular migration. 相似文献
53.
Jean-Pierre Jolivet Sophie Cassaignon Corinne Chanéac David Chiche Olivier Durupthy David Portehault 《Comptes Rendus Chimie》2010,13(1-2):40-51
The aim of this paper is to show that a very simple but well controlled chemistry in an aqueous medium allows one to efficiently control the main characteristics of oxide nanoparticles. Examples concerning titania, alumina, iron and manganese oxides are discussed to illustrate various effects on the control of size, shape and structure of nanoparticles. Some examples of functionalization of these particles are also illustrated. Experimental data, procedures and detailed references can be found in the cited literature. 相似文献
54.
55.
56.
57.
E. Brönnimann W. Baumgartner 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1973,24(3):453-454
Ohne Zusammenfassung 相似文献
58.
B. Balmer P. Kaufmann W. Baumgartner 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1972,23(6):1014-1017
Ohne Zusammenfassung 相似文献
59.
Bernhard Baumgartner 《Communications in Mathematical Physics》1976,47(3):215-219
The energy of non-relativistic neutral atoms is shown to approach asymptotically the Thomas-Fermi-energy, when the charge of the nucleus tends to infinity. 相似文献
60.
Jarmer DJ Lengsfeld CS Randolph TW 《Langmuir : the ACS journal of surfaces and colloids》2004,20(17):7254-7264
We measured nucleation and growth rates of poly(L-lactic acid) (PLLA) microparticles produced during precipitation with a compressed-fluid antisolvent (PCA). The injector/precipitator used in this study satisfied the constraints and assumptions incorporated in the development of the mixed-suspension, mixed-product-removal population balance theory. A semicontinuous operation mode with batch product filtering was developed, and results from product particle size distributions allowed nucleation and growth rates to be determined through the use of population balances. Kinetic data, obtained by operating the precipitator under various degrees of supersaturation and suspension density, were used to generate a nucleation rate model for PLLA. Model results indicate a relative kinetic order of 1 and a linear dependence of the nucleation rate on the suspension density. First-order dependence of the nucleation rate on suspension density suggests secondary nucleation mechanism(s) are operative within this PCA flow system and may explain the relative insensitivity of particle size distributions to changes in PCA operating conditions. 相似文献