全文获取类型
收费全文 | 331篇 |
免费 | 35篇 |
国内免费 | 1篇 |
专业分类
化学 | 306篇 |
晶体学 | 1篇 |
力学 | 1篇 |
数学 | 1篇 |
物理学 | 58篇 |
出版年
2021年 | 8篇 |
2020年 | 3篇 |
2019年 | 4篇 |
2018年 | 3篇 |
2017年 | 5篇 |
2016年 | 6篇 |
2015年 | 6篇 |
2014年 | 6篇 |
2013年 | 21篇 |
2012年 | 34篇 |
2011年 | 16篇 |
2010年 | 6篇 |
2009年 | 6篇 |
2008年 | 14篇 |
2007年 | 16篇 |
2006年 | 13篇 |
2005年 | 13篇 |
2004年 | 3篇 |
2003年 | 8篇 |
2002年 | 15篇 |
2001年 | 8篇 |
2000年 | 8篇 |
1999年 | 6篇 |
1998年 | 5篇 |
1997年 | 4篇 |
1996年 | 17篇 |
1995年 | 10篇 |
1994年 | 4篇 |
1993年 | 11篇 |
1992年 | 7篇 |
1991年 | 5篇 |
1990年 | 3篇 |
1989年 | 4篇 |
1988年 | 8篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 4篇 |
1984年 | 3篇 |
1981年 | 2篇 |
1979年 | 3篇 |
1978年 | 5篇 |
1977年 | 2篇 |
1976年 | 4篇 |
1975年 | 2篇 |
1973年 | 4篇 |
1972年 | 6篇 |
1939年 | 3篇 |
1938年 | 2篇 |
1937年 | 2篇 |
1936年 | 2篇 |
排序方式: 共有367条查询结果,搜索用时 15 毫秒
101.
102.
103.
Dieter Enders Dirk Backhaus Jan Runsink 《Angewandte Chemie (International ed. in English)》1994,33(20):2098-2100
104.
Bazin D Brown BA Campbell CM Church JA Dinca DC Enders J Gade A Glasmacher T Hansen PG Mueller WF Olliver H Perry BC Sherrill BM Terry JR Tostevin JA 《Physical review letters》2003,91(1):012501
The reaction 9Be(28Mg,26Ne+gamma)X has been studied at 82 MeV/nucleon together with two similar cases, 30Mg and 34Si. Strong evidence that the reactions are direct is offered by the parallel-momentum distributions of the reaction residues and by the inclusive cross sections. The pattern of the partial cross sections for 28Mg suggests the presence of correlations. A preliminary theoretical discussion based on eikonal reaction theory and the many-body shell model is presented. The reaction holds great promise for the study of neutron-rich nuclei. 相似文献
105.
We report an experimental approach to separate temperature dependent reversible and irreversible contributions to the perpendicular magnetic anisotropy of Fe films grown at low temperatures on Cu(001) substrates. The surface anisotropy K(S)(T) is found to decrease linearly with temperature, causing a thermally induced spin reorientation into the plane. The irreversible shift of the spin reorientation transition and the coercivity of the iron films are directly correlated to the increasing Fe island size during annealing. The increased coercivity is discussed in terms of domain wall energy inhomogeneities provided by the islands. 相似文献
106.
107.
108.
109.
110.
Dipl.‐Chem. Vikas Aggarwal Dipl.‐Chem. Linus F. Reichenbach Dipl.‐Chem. Mirja Enders Dr. Thierry Muller Dipl.‐Ing. Simone Wolff Marlene Crone Prof. Dr.‐Ing. Michael Türk Prof. Dr. Stefan Bräse 《Chemistry (Weinheim an der Bergstrasse, Germany)》2013,19(38):12794-12799
The optimized synthesis of a range of cyclooctadiene‐stabilized Pt complexes that contained different perfluoro‐alkane chains, [Pt(cod)Me(CnF2n+1)], is presented. These metal–organic compounds were employed in the so‐called supercritical fluid reactive deposition (SFRD) in CO2 under reductive conditions to generate metallic nanoparticles on aluminum oxide as a porous support. Thus, Al2O3‐supported Pt nanoparticles with a narrow particle‐size distribution were obtained. At a reduction pressure of 15.5 MPa and a temperature of 353 K, particle diameters of d50=2.3–2.8 nm were generated. Decreasing the pressure during the reduction reaction led to slightly larger particles whilst decreasing the amount of organometallic precursor in CO2 yielded a decrease in the particle size from x50=3.2 nm to 2.6 nm and a particle‐size distribution of 2.2 nm. Furthermore, substitution of the CH3 end group by the CnF2n+1 end groups led to a significant drop in Pt loading of about 50 %. Within the series of perfluorinated end groups that were considered, the Pt complex that contained a branched perfluoro‐isopropyl group showed the most‐interesting results when compared to the control precursor, [Pt(cod)Me2] ( 1 ). 相似文献