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161.
162.
JETP Letters - It has been shown that channels of resonant X-ray scattering with a change in polarization can be present in allowed Bragg reflections. The measurement of the energy and azimuthal... 相似文献
163.
A. A. Antonenko E. N. Ovchinnikova V. E. Dmitrienko S. P. Collins 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2008,2(4):560-563
Features of resonant diffraction of synchrotron radiation in magnetic crystals in which the local symmetry of resonant atom positions is lower than cubic are considered. It was shown that the simultaneous presence of two anisotropic factors can cause asymmetry of the azimuthal dependence of purely resonant reflections. The observed azimuthal dependence of the 002 reflection in the HoFe2 crystal was numerically simulated. 相似文献
164.
An efficient sonochemical methodology is described for the synthesis of new podands containing substituted dihydropyrimidines. 相似文献
165.
166.
167.
S. N. Ovchinnikova N. P. Poddubnyi A. I. Maslii V. V. Boldyrev W. Schwarzacher 《Russian Journal of Electrochemistry》2002,38(11):1210-1216
The effect of nickel deposition and hydrogen evolution on the transport of copper-containing ions is studied by numerically solving an electrodiffusion problem with use made of variational values of the formation constants of nickel and copper complexes in acetate and sulfamate electrolytes and thicknesses of the diffusion layer. It is concluded that the major contribution to the mass transfer is made by the effects of exaltation of the migration current and by the agitation of the near-electrode layer of electrolyte by evolving hydrogen. The possibility of employing migration effects in order to reduce the limiting current of copper in the region of nickel deposition and hydrogen evolution is substantiated. This will decrease the copper content in a layer of alloy during electrodeposition of layered structures. 相似文献
168.
This contribution reports an ab initio study of 18 ion-pair states of the Br2 molecule correlating with the Br+(3PJ=2,1,0,1D2) +Br–(1S0) dissociation asymptotes. Calculations were performed on the CASSCF/CASPT2 level of theory taking into account electron correlations and with inclusion of the spinorbit coupling. Ab initio results are compared with the experiment. For gerade and ungerade ion-pair potentials, the difference between calculated and experimental values of the equilibrium internuclear distance does not exceed ΔRe = ±0.01 and ±0.05 Å, respectively. For the states correlating to the lowest dissociation asymptote Br+(3P2) + Br–(1S0), the accuracy of relative energies is postilions ΔTe ± 0.02 eV. The dipole moment functions for some transitions between the ion-pair and valence states were calculated as well. 相似文献
169.
E. N. Ovchinnikova A. Rogalev F. Wilhelm K. A. Kozlovskaya A. P. Oreshko V. E. Dmitrienko 《Journal of Experimental and Theoretical Physics》2016,123(1):27-32
The local electronic structure of copper ions in a copper metaborate CuB2O4 crystal is studied on the ESRF synchrotron using X-ray absorption polarization-dependent spectroscopy. The X-ray natural circular dichroism near the K absorption edge of copper is measured in the direction that is perpendicular to crystal axis c. The data obtained indicate the presence of hybridized p–d electronic states of copper. Theoretical calculations are used to separate the contributions of the two crystallographically nonequivalent positions of copper atoms in the unit cell of CuB2O4 to the absorption and X-ray circular dichroism spectra of the crystal. 相似文献
170.
The distribution of gold between pyrrhotite and greenockite was studied by the method of hydrothermal thermal-gradient cocrystallization of the components at a temperature of 450°C, a pressure of 1 kbar, and different activities of sulfur in the presence of As and Se impurities. The structural component of Au impurity in these minerals was selected by studying statistical samplings of the analytical data for single crystals. Ferrous greenockite incorporates a maximum of 10 ± 2 ppm Au in solid solution. The incorporation limit of Au in stoichiometric pyrrhotite was estimated to be 25 ± 9 ppm; for nonstoichiometric pyrrhotites, it is lower. The As and Se impurities barely affect the concentration of structural gold in the minerals. It was shown that constitutional vacancies in pyrrhotite do not capture Au impurity. The observed phenomenon may be the growth effect related to the surface properties of nonstoichiometric pyrrhotite crystals grown under hydrothermal conditions. Differences in the surface structure of pyrrhotites of different composition and the products of their sorption of gold were revealed by X-ray photoelectron spectroscopy. 相似文献