全文获取类型
收费全文 | 2335篇 |
免费 | 145篇 |
国内免费 | 2篇 |
专业分类
化学 | 1620篇 |
晶体学 | 19篇 |
力学 | 37篇 |
数学 | 248篇 |
物理学 | 558篇 |
出版年
2024年 | 6篇 |
2023年 | 19篇 |
2022年 | 38篇 |
2021年 | 84篇 |
2020年 | 79篇 |
2019年 | 118篇 |
2018年 | 112篇 |
2017年 | 91篇 |
2016年 | 133篇 |
2015年 | 94篇 |
2014年 | 107篇 |
2013年 | 147篇 |
2012年 | 146篇 |
2011年 | 175篇 |
2010年 | 110篇 |
2009年 | 85篇 |
2008年 | 123篇 |
2007年 | 121篇 |
2006年 | 116篇 |
2005年 | 90篇 |
2004年 | 73篇 |
2003年 | 58篇 |
2002年 | 57篇 |
2001年 | 32篇 |
2000年 | 19篇 |
1999年 | 21篇 |
1998年 | 11篇 |
1997年 | 7篇 |
1996年 | 11篇 |
1995年 | 11篇 |
1992年 | 7篇 |
1990年 | 10篇 |
1989年 | 5篇 |
1988年 | 10篇 |
1987年 | 19篇 |
1986年 | 11篇 |
1985年 | 6篇 |
1982年 | 5篇 |
1981年 | 6篇 |
1980年 | 5篇 |
1979年 | 7篇 |
1978年 | 8篇 |
1977年 | 6篇 |
1976年 | 14篇 |
1975年 | 6篇 |
1974年 | 6篇 |
1973年 | 10篇 |
1972年 | 14篇 |
1971年 | 6篇 |
1970年 | 6篇 |
排序方式: 共有2482条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
A. P. Voronov G. N. Babenko V. M. Puzikov A. D. Roshal’ V. I. Salo 《Crystallography Reports》2008,53(4):708-712
The features of doping of KDP crystals with cerium ions and organocerium complexes with alizarin complexon and arsenazo III have been investigated. It is established that “direct” doping by introducing cerium salts into the initial solution cannot be implemented. The effect of organometallic complexes of cerium on the crystal growth has been studied. Organocerium complexes predominantly enter the prismatic or pyramidal growth sectors. It is shown that the complex arsenazo III + Ce blocks the growth of the prismatic sector. Cerium-doped KDP crystals exhibit a photoluminescence band peaking at the wavelength λmax= 350 nm. 相似文献
5.
For the first time a comparative study of holographic recording in planarly oriented films of nematic and cholesteric azobenzene-containing polymers was performed. The influence of temperature and light intensity on the values of diffraction efficiencies of holographic gratings was investigated. The kinetics of grating relaxation at different temperatures was studied. It was shown that the helical supramolecular structure of cholesteric copolymer causes a significant decrease of the diffraction efficiency in comparison with the one observed for the nematic state of the homopolymer. 相似文献
6.
Alexey Yurasov Alexander Granovsky Sergey Tarapov Jean-Pierre Clerc 《Journal of magnetism and magnetic materials》2006
The transmission of millimeter-range electromagnetic waves (30–50 GHz) through a magnetic nanocomposite thin film exhibiting tunnel magnetoresistance (TMR) is calculated. The relative change of transmission coefficient in an applied magnetic field due to the magnetorefractive effect is approximately linear with TMR and strongly depends on nanocomposite resistivity and film thickness. The obtained results are in a good agreement with experiment. 相似文献
7.
8.
The effect of the removal of zinc from brass nanoparticles has been experimentally discovered upon irradiating their suspension in ethanol by laser radiation. The analysis of the absorption spectra of nanoparticles shows that brass nanoparticles are transformed to copper nanoparticles during irradiation. The results are interpreted in terms of the high-pressure-induced modification of the phase diagram of nanoparticles. This pressure is caused by, first, the small radius of nanoparticles and, second, the pressure of the surrounding-liquid vapors upon the laser heating of nanoparticles. 相似文献
9.
Vladimir B. Arion Alexey A. Nazarov Christian G. Hartinger Gerald Giester Bernhard K. Keppler 《应用有机金属化学》2003,17(9):723-724
For the unsymmetrical title compound, 1‐bromo‐1′‐[(2S)‐N‐(1‐hydroxy‐3‐methylbutane‐2‐yl)]‐ferroceneamide, two independent molecules were found in the asymmetric unit. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
10.
A. A. Voronov 《Communications in Mathematical Physics》1990,131(1):179-218
1) | Physics. In the calculation of g-loop string tachyon amplitudes withn scattering points the distinguished Polyakov measure d g,n on the moduli spaceM g,n of Riemann surfaces of genus g withn punctures arises. We give an interpretation of this measure as the modulus squared of a holomorphic section g,n (the Mumford form) of a certain holomorphic line bundle, i.e., we prove an analog of the Belavin-Knizhnik theorem d g,n =| g,n |2 in the amplitudic case. We give an expression for this measure through the determinants of the Laplace operators over ghosts and over multivalued fields with monodromy prescribed by momenta at the scattering points. We show also that the form g,n (n0) (n0) for the partition function andn-point amplitudes can be obtained from a unified over alln, universal Mumford form. |
2) | Mathematics. The following new concepts from the theory of complex algebraic curves are investigated: divisors with complex coefficients, complex powers of holomorphic line bundles, determinants of Laplace operators over multivalued functions, etc. The corresponding generalizations of the determinant line bundles, the Weil-Deligne pairings, the Quillen and the Arakelov-Deligne metrics are constructed. A suggested by string amplitude considerations analog of the Mumford theorem on holomorphic triviality of the bundle 2 1 -13 over the moduli space is given. This analog asserts the existence of a canonical flat metric on a certain line bundle (see the main body of the text). There exist two differences: the latter bundle is not holomorphically trivial but has a canonical flat metric, and, being defined on the Teichmüller spaceT g, n , this bundle can be pulled down only on an infinite-sheeted covering of the moduli spaceM g,n . The universal isometries and the relative curvatures from the second part of the paper may be interesting, too. |