全文获取类型
收费全文 | 1171篇 |
免费 | 46篇 |
国内免费 | 6篇 |
专业分类
化学 | 960篇 |
晶体学 | 3篇 |
力学 | 10篇 |
数学 | 125篇 |
物理学 | 125篇 |
出版年
2024年 | 2篇 |
2023年 | 7篇 |
2022年 | 14篇 |
2021年 | 19篇 |
2020年 | 15篇 |
2019年 | 15篇 |
2018年 | 5篇 |
2017年 | 14篇 |
2016年 | 33篇 |
2015年 | 30篇 |
2014年 | 37篇 |
2013年 | 35篇 |
2012年 | 67篇 |
2011年 | 87篇 |
2010年 | 41篇 |
2009年 | 38篇 |
2008年 | 81篇 |
2007年 | 69篇 |
2006年 | 84篇 |
2005年 | 69篇 |
2004年 | 64篇 |
2003年 | 44篇 |
2002年 | 50篇 |
2001年 | 20篇 |
2000年 | 17篇 |
1999年 | 13篇 |
1998年 | 21篇 |
1997年 | 19篇 |
1996年 | 16篇 |
1995年 | 20篇 |
1994年 | 23篇 |
1993年 | 17篇 |
1992年 | 12篇 |
1991年 | 6篇 |
1990年 | 13篇 |
1989年 | 11篇 |
1988年 | 11篇 |
1987年 | 13篇 |
1986年 | 9篇 |
1985年 | 8篇 |
1984年 | 9篇 |
1983年 | 7篇 |
1982年 | 4篇 |
1981年 | 3篇 |
1980年 | 7篇 |
1979年 | 2篇 |
1978年 | 4篇 |
1977年 | 2篇 |
1975年 | 2篇 |
1973年 | 4篇 |
排序方式: 共有1223条查询结果,搜索用时 0 毫秒
161.
162.
163.
We investigated the content and extent of education in medical/clinical genetics among Swedish universities, university colleges and colleges of health providing undergraduate education for medical doctors and nurses. In addition, selected medical specialist training programmes and programmes for midwives and district nurses were analysed to detect elements of education or training in medical/clinical genetics. The main results are that, although basic cell biology is taught during the first semesters in all education, there is little or no genetics taught during the clinical parts of the educational programmes. Moreover, with regard to post-graduate education, it is almost absent. There is a need to improve education and training in genetics for all health care professionals to meet the expected increase in genetic issues in clinical medicine. 相似文献
164.
We have studied the influence of magnetic order on the optical phonons of the geometrically frustrated spinel ZnCr2O4 within density-functional theory. By mapping local spin density approximation plus Hubbard U (LSDA + U) phonon calculations onto a Heisenberg-like model, we developed a method to calculate exchange derivatives and subsequently the spin-phonon coupling parameter from first principles. 相似文献
165.
166.
Dominik Jacob Kathrin Thüring Aurellia Galliot Virginie Marchand Adeline Galvanin Akif Ciftci Karin Scharmann Michael Stock Jean‐Yves Roignant Sebastian A. Leidel Yuri Motorin Raffael Schaffrath Roland Klassen Mark Helm 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(28):9666-9670
167.
Kristina O. Kvashnina Anna Yu. Romanchuk Ivan Pidchenko Lucia Amidani Evgeny Gerber Alexander Trigub Andre Rossberg Stephan Weiss Karin Popa Olaf Walter Roberto Caciuffo Andreas C. Scheinost Sergei M. Butorin Stepan N. Kalmykov 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(49):18044-18044
168.
Bertold Rasche Minjun Yang Lothar Nikonow Joshaniel F. K. Cooper Claire A. Murray Sarah J. Day Karin Kleiner Simon J. Clarke Richard G. Compton 《Angewandte Chemie (International ed. in English)》2019,58(43):15401-15406
We report the precise postsynthetic control of the composition of β‐Fe1+xSe by electrochemistry with simultaneous tracking of the associated structural changes via in situ synchrotron X‐ray diffraction. We access the full phase width of 0.01<x<0.04 and identify the superconducting state below 8 K, which in contrast to earlier reports is independent of the composition. However, in a second set of in situ X‐ray diffraction experiments, we demonstrate that β‐Fe1+xSe forms a new phase in the presence of oxygen above a 100 °C which has the same anti‐PbO type structure but is not superconducting down to 1.8 K. The latter process can be reversed electrochemically to reinstate the superconducting state. These observations exploit the exquisite control afforded by electrochemistry in contrast with classical approaches of chemical synthesis. 相似文献
169.
We study a mixture of strongly interacting bosons and spinless fermions with on-site repulsion in a three-dimensional optical lattice. For this purpose we develop and apply a generalized dynamical mean-field theory, which is exact in infinite dimensions and reliably describes the full range from weak to strong coupling. We restrict ourselves to half filling. For weak Bose-Fermi repulsion a supersolid forms, in which bosonic superfluidity coexists with charge-density wave order. For stronger interspecies repulsion the bosons become localized while the charge-density wave order persists. The system is unstable against phase separation for weak repulsion among the bosons. 相似文献
170.
We investigate the time-dependent Kondo effect in a single-molecule magnet (SMM) strongly coupled to metallic electrodes. Describing the SMM by a Kondo model with large spin S>1/2, we analyze the underscreening of the local moment and the effect of anisotropy terms on the relaxation dynamics of the magnetization. Underscreening by single-channel Kondo processes leads to a logarithmically slow relaxation, while finite uniaxial anisotropy causes a saturation of the SMM's magnetization. Additional transverse anisotropy terms induce quantum spin tunneling and a pseudospin-1/2 Kondo effect sensitive to the spin parity. 相似文献