全文获取类型
收费全文 | 2883篇 |
免费 | 261篇 |
国内免费 | 14篇 |
专业分类
化学 | 2155篇 |
晶体学 | 11篇 |
力学 | 60篇 |
数学 | 413篇 |
物理学 | 519篇 |
出版年
2024年 | 2篇 |
2023年 | 52篇 |
2022年 | 75篇 |
2021年 | 118篇 |
2020年 | 166篇 |
2019年 | 186篇 |
2018年 | 83篇 |
2017年 | 69篇 |
2016年 | 198篇 |
2015年 | 150篇 |
2014年 | 161篇 |
2013年 | 194篇 |
2012年 | 274篇 |
2011年 | 266篇 |
2010年 | 154篇 |
2009年 | 127篇 |
2008年 | 193篇 |
2007年 | 155篇 |
2006年 | 148篇 |
2005年 | 97篇 |
2004年 | 59篇 |
2003年 | 30篇 |
2002年 | 29篇 |
2001年 | 25篇 |
2000年 | 17篇 |
1999年 | 15篇 |
1998年 | 11篇 |
1997年 | 5篇 |
1996年 | 9篇 |
1995年 | 9篇 |
1994年 | 8篇 |
1993年 | 4篇 |
1992年 | 9篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1988年 | 3篇 |
1987年 | 6篇 |
1986年 | 5篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1981年 | 6篇 |
1980年 | 2篇 |
1979年 | 3篇 |
1978年 | 5篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1957年 | 1篇 |
1936年 | 1篇 |
1932年 | 2篇 |
1928年 | 1篇 |
排序方式: 共有3158条查询结果,搜索用时 15 毫秒
31.
32.
Patrick Achenbach Sebastian Bleser Josef Pochodzalla Alicia Sanchez Lorente Marcel Steinen 《Hyperfine Interactions》2012,208(1-3):99-104
Samples obtained as a result of the valleriite synthesis process under different conditions (temperature and proportion Cu:Fe:Mg in the initial mixture) were investigated by 57Fe M?ssbauer spectroscopy with attraction data of X-ray diffraction. Parameters of hyperfine interactions for valleriite were determined and crystal chemical identification of 57Fe subspectra was carried out. It was found that valleriite was formed in samples synthesized at 150°C and 180°C and not formed in samples synthesized at 250°C. 相似文献
33.
34.
35.
36.
Theo Steininger Jait Dixit Philipp Frank Maksim Greiner Sebastian Hutschenreuter Jakob Knollmüller Reimar Leike Natalia Porqueres Daniel Pumpe Martin Reinecke Matev raml Csongor Varady Torsten Enßlin 《Annalen der Physik》2019,531(3)
NIFTy , “Numerical Information Field Theory,” is a software framework designed to ease the development and implementation of field inference algorithms. Field equations are formulated independently of the underlying spatial geometry allowing the user to focus on the algorithmic design. Under the hood, NIFTy ensures that the discretization of the implemented equations is consistent. This enables the user to prototype an algorithm rapidly in 1D and then apply it to high‐dimensional real‐world problems. This paper introduces NIFTy 3, a major upgrade to the original NIFTy framework. NIFTy 3 allows the user to run inference algorithms on massively parallel high performance computing clusters without changing the implementation of the field equations. It supports n‐dimensional Cartesian spaces, spherical spaces, power spaces, and product spaces as well as transforms to their harmonic counterparts. Furthermore, NIFTy 3 is able to handle non‐scalar fields, such as vector or tensor fields. The functionality and performance of the software package is demonstrated with example code, which implements a mock inference inspired by a real‐world algorithm from the realm of information field theory. NIFTy 3 is open‐source software available under the GNU General Public License v3 (GPL‐3) at https://gitlab.mpcdf.mpg.de/ift/NIFTy/tree/NIFTy_3 . 相似文献
37.
Sebastian Peil Alois Fürstner 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(51):18647-18652
Enynes with a tethered carbonyl substituent are converted into substituted furan derivatives upon hydrogenation using [Cp*RuCl]4 as the catalyst. Paradoxically, this transformation can occur along two distinct pathways, each of which proceeds via discrete pianostool ruthenium carbenes. In the first case, hydrogenation and carbene formation are synchronized (“gem‐hydrogenation”), whereas the second pathway comprises carbene formation by carbophilic activation of the triple bond, followed by hydrogenative catalyst recycling. Representative carbene intermediates of either route were characterized by X‐ray crystallography; the structural data prove that the attack of the carbonyl group on the electrophilic carbene center follows a Bürgi–Dunitz trajectory. 相似文献
38.
39.
40.