全文获取类型
收费全文 | 452篇 |
免费 | 6篇 |
国内免费 | 1篇 |
专业分类
化学 | 211篇 |
晶体学 | 13篇 |
力学 | 7篇 |
数学 | 32篇 |
物理学 | 196篇 |
出版年
2021年 | 3篇 |
2020年 | 6篇 |
2019年 | 12篇 |
2018年 | 10篇 |
2017年 | 14篇 |
2016年 | 7篇 |
2014年 | 11篇 |
2013年 | 12篇 |
2012年 | 13篇 |
2011年 | 13篇 |
2010年 | 16篇 |
2009年 | 17篇 |
2008年 | 15篇 |
2007年 | 21篇 |
2006年 | 12篇 |
2005年 | 8篇 |
2004年 | 14篇 |
2003年 | 10篇 |
2002年 | 14篇 |
2001年 | 16篇 |
2000年 | 8篇 |
1999年 | 9篇 |
1998年 | 7篇 |
1996年 | 6篇 |
1995年 | 6篇 |
1993年 | 2篇 |
1991年 | 4篇 |
1990年 | 8篇 |
1989年 | 5篇 |
1988年 | 9篇 |
1987年 | 19篇 |
1986年 | 11篇 |
1985年 | 6篇 |
1984年 | 2篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1981年 | 5篇 |
1980年 | 5篇 |
1979年 | 6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 |
1969年 | 3篇 |
1967年 | 2篇 |
排序方式: 共有459条查询结果,搜索用时 15 毫秒
1.
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
2.
3.
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
4.
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. |
5.
V. Yu. Ponomarev P. F. Bortignon R. A. Broglia V. V. Voronov 《Zeitschrift für Physik A Hadrons and Nuclei》1987,356(3):251-254
Damping width of the double giant dipole resonance of 136Xe excited in relativistic heavy ion collisions is calculated by diagonalizing a microscopic Hamiltonian in a basis containing one-, two- and three-phonon states. The coupling between these states is determined making use of the fermion structure of the phonons. The resulting width of the double giant dipole resonance is close to \(\left( {3_1^ + } \right)\) times the width of the single giant dipole resonance. 相似文献
6.
The proton NMR spectra of Si-substituted silatranes, a new class of biologically active compounds, measured in the presence of Co2+, Ni2+ and Eu3+ ions are examined. These silatranes coordinate with Co2+ and Ni2+ through a nitrogen atom and with Eu3+ through an oxygen atom mainly without transition to the exo-form. The electronic structure of nitrogen in silatranes is the same as that of pyrrol nitrogen. This suggests that in silatranes a nitrogen lone pair and oxygen lone pairs form common electron system analogous, for example, to the π-system of unsaturated cycles. 相似文献
7.
Yu. L. Frolov V. K. Voronov N. M. Deriglazov L. V. Belousova N. M. Vitkovskaya S. M. Tyrina G. G. Skvortsova 《Chemistry of Heterocyclic Compounds》1972,8(1):89-94
The PMR, Raman, and UV absorption spectra of 2-hydroxypyridine and its vinyl derivatives were investigated. Their electrochemical reduction was studied, and a quantum-chemical analysis of them was performed. It was concluded that the structure of 2-hydroxypyridine in proton-donor solvents is mesomeric, and its wave function, to a first approximation, is a linear combination of the wave functions of the 2-pyridone and zwitterion models. The contribution of the wave functions of each of the models depends substantially on the concentration of the solution and the nature of the solvent. An assumption was made regarding the presence of dynamic conjugation between the vinyl group and the ring in vinyl derivatives of 2-hydroxypyridine.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 95–102 January, 1972. 相似文献
8.
N. N. Veniaminov S. A. Khovavko S. A. Voronov S. L. Orlov L. A. Azarov S. Yu. Arkhipov T. N. Evdokimov 《Journal of Analytical Chemistry》2003,58(4):355-360
The elemental and isotopic composition of the core material of a hard-core projectile that had fallen onto the ground was studied by secondary-ion mass spectrometry, alpha and gamma spectrometry, X-ray photoelectron spectroscopy, and scanning electron microscopy with X-ray microanalysis. The environmental aspect of the use of depleted uranium ammunition in Yugoslavia is discussed. 相似文献
9.
B. A. Trofimov A. I. Mikhaleva R. I. Polovnikova S. E. Korostova R. N. Nesterenko N. I. Golovanova V. K. Voronov 《Chemistry of Heterocyclic Compounds》1981,17(8):783-786
2-(2-Furyl)pyrroles and 1-vinyl-2-(2-furyl)pyrroles were obtained in up to 80% yields in the reaction of ketoximes of the furan series with acetylene in MOH—dimethyl sulfoxide (M = Li, K) Superbase media.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1058–1061, August, 1981. 相似文献
10.
S. I. Dolgaev A. A. Lyalin G. A. Shafeev Shafeev Voronov 《Applied Physics A: Materials Science & Processing》1996,63(1):75-79
The etching of polycrystalline SiC is studied with the help of radiation of a copper-vapor laser either in air or under the layer of a liquid (H2O, DMSO). The etching rate in air is as high as 0.24 m/pulse, in DMSO 0.07 gm/pulse at an energy density of 16 J/cm2. The etched surface is characterized with Scanning Electron Microscopy (SEM) and X-ray diffractometry. Etching of SiC ceramics in air revealed the partial amorphization of SiC and the formation of microcrystals of elementary Si with an average size of 300 Å. The etched surface of SiC ceramics takes on the ability to reduce Cu from a corresponding electroless plating solution. The adherence of the deposit is as high as 30 N/mm2 and is a function of the scanning velocity of the laser beam. 相似文献