全文获取类型
收费全文 | 3548篇 |
免费 | 205篇 |
国内免费 | 18篇 |
专业分类
化学 | 2422篇 |
晶体学 | 13篇 |
力学 | 135篇 |
数学 | 637篇 |
物理学 | 564篇 |
出版年
2023年 | 31篇 |
2022年 | 40篇 |
2021年 | 61篇 |
2020年 | 79篇 |
2019年 | 76篇 |
2018年 | 70篇 |
2017年 | 76篇 |
2016年 | 177篇 |
2015年 | 138篇 |
2014年 | 122篇 |
2013年 | 225篇 |
2012年 | 267篇 |
2011年 | 280篇 |
2010年 | 164篇 |
2009年 | 117篇 |
2008年 | 229篇 |
2007年 | 194篇 |
2006年 | 164篇 |
2005年 | 169篇 |
2004年 | 150篇 |
2003年 | 140篇 |
2002年 | 124篇 |
2001年 | 39篇 |
2000年 | 29篇 |
1999年 | 37篇 |
1998年 | 37篇 |
1997年 | 26篇 |
1996年 | 38篇 |
1995年 | 12篇 |
1994年 | 20篇 |
1993年 | 28篇 |
1992年 | 18篇 |
1991年 | 15篇 |
1990年 | 15篇 |
1989年 | 12篇 |
1988年 | 15篇 |
1987年 | 15篇 |
1986年 | 15篇 |
1985年 | 32篇 |
1984年 | 26篇 |
1983年 | 15篇 |
1982年 | 17篇 |
1981年 | 11篇 |
1980年 | 12篇 |
1979年 | 21篇 |
1978年 | 18篇 |
1977年 | 16篇 |
1975年 | 12篇 |
1974年 | 15篇 |
1973年 | 16篇 |
排序方式: 共有3771条查询结果,搜索用时 15 毫秒
861.
862.
Stefan Schernich Dr. Mathias Laurin Dr. Yaroslava Lykhach Dr. Nataliya Tsud Dr. Marek Sobota Dr. Tomáš Skála Dr. Kevin C. Prince Dr. Nicola Taccardi Valentin Wagner Prof. Dr. Hans-Peter Steinrück Prof. Dr. Vladimír Matolín Prof. Dr. Peter Wasserscheid Prof. Dr. Jörg Libuda 《Chemphyschem》2013,14(16):3673-3677
863.
864.
Charles Ng Xiangju Kong Dr. Dongxia Wu Dr. Min Song Dr. Xiaohong Shi Xiaochun Xu Wei‐Han OuYang Rongxian He Prof. Xing‐Zhong Zhao Tom Lee Prof. F. Charles Brunicardi Dr. Mitch André Garcia Prof. Antoni Ribas Prof. Roger S. Lo Prof. Hsian‐Rong Tseng 《Angewandte Chemie (International ed. in English)》2013,52(12):3379-3383
865.
Sanyalak Niratisairak Tom H. Johansen Susumu Katouda Takayuki Ishibashi 《Physica C: Superconductivity and its Applications》2011,471(7-8):222-225
Two voltage jumps were found in the current–voltage characteristic of a thin superconducting film of Bi2Sr2CaCu2Ox at temperature 58 K. The fluorescent thermal imaging technique revealed a localized heat dissipation (hotspot) nucleated at the current causing the second jump, and the hotspots’ temperature is close to the critical temperature of the superconducting film. 相似文献
866.
Yves Fleming Tom WirtzUrs Gysin Thilo GlatzelUrs Wegmann Ernst MeyerUrs Maier Jörg Rychen 《Applied Surface Science》2011,258(4):1322-1327
With the breakthroughs in lateral resolution with regards to secondary ion mass spectroscopy in recent years, new areas of research with much promise have opened up to the scientific community. Even though the much improved lateral resolution of 50 nm can effectively deliver more accurate 3D-images, the traditional 3D reconstructions, consisting of compiling previously acquired successive secondary ion mass spectrometry images into a 3D-stack, do not represent the real localized chemical distribution of the sputtered volume. Based on samples initially analyzed on the Cameca NanoSIMS 50 instrument, this paper portrays the advantages of combining the topographical information from atomic force microscopy and the chemical information from secondary ion mass spectrometry. Taking account of the roughness evolution within the analyzed zone, 3D reconstructions become a lot more accurate and allow an easier interpretation of results. On the basis of an Al/Cu sample, a comparison between traditional 3D imaging and corrected 3D reconstructions is given and the advantages of the newly developed 3D imaging method are explained. 相似文献
867.
868.
869.
Let e1, e′1; e2, e′2;…;ei, e′i;??? be a sequence of ordered pairs of edges chosen uniformly at random from the edge set of the complete graph Kn (i.e. we sample with replacement). This sequence is used to form a graph by choosing at stage i, i=1,…, one edge from ei,e′i to be an edge in the graph, where the choice at stage i is based only on the observation of the edges that have appeared by stage i. We show that these choices can be made so that whp the size of the largest component of the graph formed at stage 0.535n is polylogarithmic in n. This resolves a question of Achlioptas. © 2001 John Wiley & Sons, Inc. Random Struct. Alg., 19, 75–85, 2001 相似文献
870.