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81.
L. V. Rachinskii A. P. Neverov T. N. Dybina É. A. Pakshver 《Mechanics of Composite Materials》1975,11(6):923-926
A method of calculating the constants found in Kohlrausch's empirical function describing relaxation processes is proposed, which is based on the application of a well-known algorithm for solving nonlinear problems on a computer using the conjugate gradient method. All the experimental information is used by this method and the degree of calculation accuracy is increased. The reproducibility of calculations to find these constants is found to be satisfactory in the case under investigation when the duration of the experiment is varied. 相似文献
82.
M. V. Yakunin S. M. Podgornykh V. N. Neverov 《Journal of Experimental and Theoretical Physics》2007,105(1):214-222
A procedure is proposed for precise scanning of the (B
⊥, B
‖) plane between the magnetic field projections that are perpendicular and parallel to (quasi-)two-dimensional layers when
measuring their longitudinal and Hall magnetoresistances. Investigations of a n-In
x
Ga1−x
As/GaAs double quantum well (x ≈ 0.2) performed using this procedure make it possible to reveal a number of the features of the magnetoresistance, which
appear due to a complex energy spectrum of the double quantum well in a parallel field, and to separate them from the structures
associated with the magnetic breakdown. The trajectories representing the features of the magnetoresistance in the (B
⊥, B
‖) plane are described by the semiclassical calculations of the quantization of the energy spectrum of the double quantum well
under the action of the perpendicular field component. The structures appearing due to the magnetic breakdown are amplified
with increasing the total magnetic field magnitude and, in the samples with low mobility, completely suppress the features
caused by the motion of an electron with a constant pseudospin component. The peaks corresponding to the magnetic breakdown
are split in a strong parallel field due to the spin splitting of the Landau levels. These splittings correspond to the effective
Landé factor |g*| ≈ 3.
Original Russian Text ? M.V. Yakunin, S.M. Podgornykh, V.N. Neverov, 2007, published in Zhurnal éksperimental’noĭ i Teoreticheskoĭ
Fiziki, 2007, Vol. 132, No. 1, pp. 241–249. 相似文献
83.
V. S. Neverov V. V. Voloshinov A. B. Kukushkin A. S. Tarasov 《Physics of Atomic Nuclei》2015,78(10):1112-1119
The influence of molecular clustering on the formerly suggested interpretation of diffraction patterns of hydrocarbon films formed in the vacuum vessel of the tokamak T-10 is analyzed numerically. The simulation of clustering of simple hydrocarbon molecules C(D, H)4, C2(D, H)4, and C6(D, H)6 and molecules composed of curved graphene (fullerenes and toroidal nanotubes) is carried out with the rigid body molecular dynamics method. It is shown that formerly neglected atomic correlations C–C and C–D(H) in the amorphous hydrocarbon component decrease the calculated values of the scattered intensity in the range of scattering vector modulus 5 < q < 20 nm–1 because of homogenization of scatters on the spatial scale of ~1 nm. The allowance for these correlations does not change the diffraction patterns in the range q > 20 nm–1. The results suggest the necessity to introduce to the procedure of determining the structural content of the films, similar to those from the tokamak T-10, the clusters formed by the van der Waals adhesion of hydrocarbon molecules to “graphene” nanoparticles. This simplifies the mathematical optimization to the former level of complexity—but for an extended ensemble of objects—and makes it possible to calculate the diffraction patterns of these objects using the distributed computing resources. A modified algorithm of structural content identification on the basis of joint X-ray and neutron diffractometry is suggested. 相似文献