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21.
É. P. Domashevskaya S. V. Ryabtsev V. A. Terekhov A. S. Len’shin F. M. Chernyshov A. T. Kazakov A. V. Sidashov 《Journal of Structural Chemistry》2011,52(1):115-122
The XPS (X-ray photoelectron spectroscopy) study of nickel oxide nanolayers obtained by magnetron sputtering of the metal and its subsequent oxidation in air at different temperatures (400°C and 1000°C) was performed. Silicon(100) was used as a substrate. Surface of the initial Ni/Si structure was shown to contain not only Ni metal, but also the NiO oxide. Annealing at 400°C results in a complete oxidation of the metal film. At a high-temperature annealing (1000°C), nickel interacts both with oxygen and silicon substrate to form NiSi silicide and a composite Ni-Si-O phase in transition layer. Electronconductivity of NiO films is determined by intercrystallite barriers. Activation energies of film electroconductivity in model gases (O2, Ar, H2) were found. 相似文献
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We present sufficient conditions for the invertibility of a second-order differential operator with variable coefficients in the space Lp.Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 47, No. 3, pp. 411–413, March, 1995.This paper was partially supported by the International Science Foundation, Grant No. ZA000. 相似文献
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The steady propagation of a thin smouldering front in a half-spacehas been considered. A suitable coordinate transformation hasallowed the region near the leading edge of the front to beexamined for both a maintained planar surface and with surfacecollapse due to material shrinkage. The change in the oxidizerconcentration for a small increment in the propagation speedfor large time and surface collapse has been determined. Theinfluence of two types of nonlinear diffusion on the shape ofthe smouldering front has been found; other cases can be dealtwith in a similar manner. 相似文献
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E. Svab N. Kroo S.N. Ishmaev I.P. Sadikov A.A. Chernyshov 《Solid State Communications》1982,44(8):1151-1155
The structure factor of Fe81B19 metallic glass was measured by the conventional and time-of-flight neutron diffraction methods in the 0.4<Q<24 Å-1 momentum transfer range, yielding high resolution (~0.26 Å) in r-space. The pair distribution function obtained by Fourier transformation is resolved into subpeaks. The distances and distribution widths of the Fe-B and Fe-Fe first neighbours, the partial coordination numbers and the short range order parameter are given. The results clearly indicate preferential chemical bonding between iron and boron atoms. 相似文献
28.
E. Sváb N. Kroó S.N. Ishmaev I.P. Sadikov A.A. Chernyshov 《Solid State Communications》1983,46(4):351-353
The S(Q) structure factor of (Ni65Fe35)77B23 metallic glass was measured by time-of-flight neutron diffraction up to 24 Å?1 momentum transfer. The distribution of transition metal-boron and transition metal-transition metal first neighbour atom pairs is resolved in the distribution function obtained from S(Q) by Fourier transformation. The distances of these first neighbours pairs, the width of their distribution, the partial coordination numbers and the short range order parameter are given. The results on (Ni65Fe35)77B23 and on the previously studies Fe81B19 amorphous alloys are compared. 相似文献
29.
Konstantin Chernyshov Dmitry Gen Yuri Shemouratov Kirill Prokhorov Gulnara Nikolaeva Elena Sagitova Pavel Pashinin Anton Kovalchuk Alla Klyamkina Polina Nedorezova Boris Shklyaruk Valery Optov 《Macromolecular Symposia》2010,296(1):505-516
Nascent form of random copolymers of propylene with ethylene, 1-butene, 1-hexene, 1-octene, and 4-methyl-1-pentene was studied by Raman spectroscopy. The most significant spectral alterations with a change in propylene content were observed in two lines at 809 and 841 cm−1. The first line corresponds to vibrations of polypropylene helical chains in the crystalline phase, while the second one is associated with vibrations of polypropylene helical chains having isomeric defects. Raman data confirm that conformational composition and phase state of copolymer macromolecules strongly depend on the comonomer content as well as on the size of the comonomer units. 相似文献
30.
V. G. Vlasenko A. I. Uraev Ya. V. Zubavichus A. A. Chernyshov A. D. Garnovskii R. K. Mamin 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(4):468-470
A series of copper metallochelates C22H18CuN4O2 X (X = Se, S, O) as models of active centers of natural metalloproteins have been synthesized on the basis of new azomethine ligand systems. The structure of the complexes has been studied by extended X-ray absorption fine-structure spectroscopy. It is shown that, in the metallochelates with X = Se or S, one azomethine chalcogen-containing ligand undergoes tridentate interaction with copper ions, while the other ligand is an acetate group. As a result, a complex with the N2O2 X environment is formed, where one of the oxygen atoms of the acetate group is at a large distance from the metal ion: R = 2.56–2.68 Å. For the metallochelate with X = O, coordination of the acetate group by a copper ion is found to be absent, and only interaction with azomethine ligands having average Cu-N/O distances R = 1.96–2.04 Å is observed. 相似文献