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1.
2.
The growth of one-dimensional atomic chains along the vicinal surface has been studied by the kinetic Monte Carlo method. It has been shown that their growth is determined exclusively by kinetic parameters such as the temperature, flux of deposited atoms, and degree of coating rather than by the binding energy and quantum effects. Conditions under which chains with “magic lengths” appear have been determined. 相似文献
3.
Bodnarchuk V. I. Boulkin A. P. Kravtsov E. A. Pleshanov N. K. Syromyatnikov V. G. Ul’yanov V. A. 《Crystallography Reports》2022,67(1):50-63
Crystallography Reports - The review is devoted to the current state of affairs and prospects for development in the field of neutron reflectometry on the existing and future neutron sources in the... 相似文献
4.
A. O. Sorokin A. V. Syromyatnikov 《Journal of Experimental and Theoretical Physics》2011,113(4):673-677
Two models of classic XY antiferromagnets in three dimensions are studied by Monte Carlo simulation: the model on a simple
cubic lattice with two extra intralayer exchanges and the model on a stackedtriangular lattice with an extra interlayer exchange.
In suggested models, the order parameters are magnetization and two chiral parameters. A transition corresponds to breaking
ℤ2 ⊗ ℤ2 ⊗ SO(2) symmetry. A distinct first order transition is found in both models. 相似文献
5.
S. V. Grigoriev N. A. Grigoryeva K. S. Napol’skii A. P. Chumakov A. A. Eliseev I. V. Roslyakov H. Eckerlebe A. V. Syromyatnikov 《JETP Letters》2011,94(8):635-641
Magnetic properties of spatially ordered arrays of interacting nanofilaments have been studied by means of small-angle diffraction
of polarized neutrons. Several diffraction maxima or rings that correspond to the scattering of the highly ordered structure
of pores/filaments with hexagonal packing have been observed in neutron scattering intensity maps. The interference (nuclear-magnetic)
and pure magnetic contributions to the scattering have been analyzed during the magnetic reversal of the nanofilament array
in a field applied perpendicular to the nanofilament axis. The average magnetization and the interference contribution proportional
to it increase with the field and are saturated at H = H
S
. The magnetic reversal process occurs almost without hysteresis. The intensity of the magnetic contribution has hysteresis
behavior in the magnetic reversal process for both the positive and negative fields that form the field dependence of the
intensity in a butterfly shape. It has been shown that this dependence is due to the magnetostatic interaction between the
filaments in the field range of H ≤ H
S
. A theory for describing the magnetic properties of the arrays of interacting ferromagnetic nanofilaments in the magnetic
field has been proposed. 相似文献
6.
O. N. Nadtoka O. V. Yaroshchuk T. V. Bednaya L. A. Ol’khovik V. G. Syromyatnikov 《Polymer Science Series A》2010,52(3):261-271
Polymethacrylates with side azo fragments containing various end substituents and spacers are synthesized and characterized.
Spatial ordering of azo fragments in the series of the synthesized azo polymers under the action of polarized excitation light
is studied by the methods of null ellipsometry and polarization spectroscopy. Two types of anisotropy development during photoirradiation
are found. In homologs with strong acceptor substituents of azo fragments, biaxial orientational structure can be observed;
as the radiation dose is increased, this structure is transformed into a uniaxial structure with a negative order parameter
and with an axis parallel to the polarization vector of the excitation light. In this structure, the maximum degree of orientational
order is achieved in polymers with high concentrations of azo fragments. In homologs with donor substituents of azo fragments,
the initial stages of irradiation likewise lead to the development of biaxial orientation; later, this orientation is transformed
into an isotropic distribution. The mode of anisotropy development is controlled by the lifetime of photoisomers of azo fragments. 相似文献
7.
The relative density distribution in the rarefied CO2 flow field behind a perforated plate has been experimentally investigated on the range of Knudsen numbers 10–3 Kn 10–1. The results of these experiments serve to demonstrate the validity of using the molecular velocity distribution function for determining the relative density on the Knudsen number interval in question. This distribution function was previously employed for calculating the parameters in molecular beams formed by capillary sieves in the free-molecular flow regime [1].Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 3, pp. 183–184, May–June, 1989. 相似文献
8.
This numerical study of dispersion characteristics of some symmetric and asymmetric composites modelled as multilayered packets of layers with arbitrary anisotropy of each layer is carried out. The authors introduce a subsidiary boundary problem of three-dimensional theory of elasticity for the system of partial differential equations describing the harmonic oscillations of the composite excited by a surface load. The authors obtained the curves and surfaces describing slowness of the wave front of Lamb waves propagating with respect to the direction of propagation. The method suggested by the authors of the present article does not impose any restrictions on the type of elastic anisotropy of the layers, their orientations and mutual positions. (© 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
9.
A. G. Syromyatnikov N. S. Kabanov A. M. Saletsky A. L. Klavsyuk 《Journal of Experimental and Theoretical Physics》2017,124(1):139-142
The formation of Co atomic chains on a Cu(775) surface is investigated by the kinetic Monte Carlo method. It is found that the length of Co atomic chains formed as a result of self-organization during epitaxial growth is a random quantity and its mean value depends on the parameters of the experiment. The existence of two structural phases in atomic chains is detected using the density functional theory. In the first phase, the separations between an atom and its two nearest neighbors in a chain are 0.230 and 0.280 nm. In the second phase, an atomic chain has identical atomic spacings of 0.255 nm. It is shown that the temperature of the structural phase transition depends on the length of the atomic chain. 相似文献
10.
S. V. Syromyatnikov I. I. Sarychev D. N. Kedys V. S. Fainberg 《Journal of Analytical Chemistry》2016,71(5):513-518
The rise in crime associated with the illicit trafficking in narcotics and psychotropic substances is one of the most severe problems in Russia today. In recent years, cases of using seeds of poppy plant “masked as food,” the bulk of which contains macroparticles of poppy straw visible to an unaided eye and which can be used as raw materials for the preparation of narcotic substances have become more frequent. In his work, using a Delta V Advantage isotopic mass spectrometer, we proposed criteria based on which tone can reveal artificial superinducements of poppy straw into “food” poppy seeds or their absence. 相似文献