全文获取类型
收费全文 | 110篇 |
免费 | 2篇 |
专业分类
化学 | 44篇 |
力学 | 1篇 |
数学 | 1篇 |
物理学 | 66篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 2篇 |
2015年 | 1篇 |
2014年 | 1篇 |
2013年 | 1篇 |
2012年 | 2篇 |
2010年 | 2篇 |
2009年 | 3篇 |
2008年 | 1篇 |
2006年 | 1篇 |
2005年 | 3篇 |
2004年 | 4篇 |
2003年 | 6篇 |
2002年 | 6篇 |
2001年 | 5篇 |
2000年 | 5篇 |
1999年 | 8篇 |
1998年 | 3篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1994年 | 4篇 |
1993年 | 3篇 |
1992年 | 4篇 |
1990年 | 3篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1984年 | 2篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1980年 | 2篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 4篇 |
1974年 | 1篇 |
1973年 | 3篇 |
1972年 | 5篇 |
1966年 | 4篇 |
1965年 | 1篇 |
1898年 | 1篇 |
排序方式: 共有112条查询结果,搜索用时 46 毫秒
91.
92.
93.
94.
Wolfgang Freyer Holger Stiel Klaus Teuchner Dieter Leupold 《Journal of photochemistry and photobiology. A, Chemistry》1994,80(1-3):161-167
Linearly benzo-annulated copper porphyrazines, such as octaphenyltetraanthraporphyrazinato-copper and octapentoxytetranaphthoporphyrazinato-copper, with absorption maxima at about 880 nm, were synthesized. These compounds exhibit very low-lying triplets with an energy below the activation energy of singlet oxygen. Therefore they do not generate singlet oxygen. The transient absorption spectra of the T1—Tx transition were measured. The solvent dependence of the photophysical parameters in the triplet manifold is discussed. On irradiation in the presence of CBr4, π-cation radicals are formed. 相似文献
95.
R. Doerfler O. Leupold D. L. Nagy G. Ritter H. Spiering R. Zimmermann 《Hyperfine Interactions》1983,16(1-4):831-835
A series of compounds all containing the ferrous hexaquo complex were investigated by Mössbauer spectroscopy at 4.2K and in magnetic fields up to 5T and far infrared techniques. The results are interpreted in terms of a T2g ligand field model for which normal distortions of the water octahedron are used as parameters. The ferrous hexaquo complex can be described in all compounds by the same covalency, spin-orbit coupling and hyperfine coupling constants. 相似文献
96.
97.
It is argued that the chiral partners of the lowest-lying hadrons are hadronic molecules and not three-quark or quark-antiquark states, respectively. As an example the case of a1 as the chiral partner of the ρ is discussed. Deconfinement-or as a precursor large in-medium widths for hadronic states-is proposed as a natural way to accommodate for the fact that at chiral restoration the respective in-medium spectra of chiral partners must become degenerate. Ingredients for a systematic and self-consistent in-medium calculation are presented with special emphasis on vector-meson dominance which emerges from a recently proposed systematic counting scheme for the mesonic sector including pseudoscalar and vector mesons as active degrees of freedom. 相似文献
98.
The decays of light vector mesons into three pseudoscalar mesons are calculated to leading order in the recently proposed
counting scheme that is based on the hadrogenesis conjecture. Fully differential as well as integrated decay widths are presented.
Since the required parameters have been fixed by other processes, the considered three-body decays are predictions of the
presented approach. The decay width of the omega meson into three pions agrees very well with the experiment. The partial
decay widths of the K* into its three K
channels are predicted. 相似文献
99.
R R?hlsberger J Bansmann V Senz K L Jonas A Bettac O Leupold R Rüffer E Burkel K H Meiwes-Broer 《Physical review letters》2001,86(24):5597-5600
We have studied the magnetism of Ag-coated Fe islands on W(110) by nuclear resonant scattering of synchrotron radiation at the 14.4 keV resonance of (57)Fe. Separated islands with an average diameter of 2.0 nm and monolayer thickness are formed at a Fe coverage of theta = 0.57 bulk monolayers. Time spectra of the nuclear decay were measured in the temperature range from 4.5 to 300 K. We find strong evidence for perpendicular spin orientation, which most likely results from the interplay of shape anisotropy and elastic strain in the islands. 相似文献
100.
The fluorescence of the widely used TPF dye rhodamine 6G is quenched by photons of the ruby as well as the Nd-glass laser. Taking into consideration the polarisation of the ground- and excited-state absorptions of rhodamine 6G a simple model of quenching results. The main process is an S1 absorption with subsequent leave of the ordinary rhodamine 6G singlet system. For Nd-laser photons the cross section of the concerned transition following from our quenching experiments is σS1→S2 = 1.2×10-16 cm2. 相似文献