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41.
Under study is some model of a spatially distributed two-species population. The species interact according to the predator-prey pattern. Each species is distributed over two stations. The migration of individuals between the stations are purposeful and maximize the breeding coefficient for each species. In addition, each species pursues its reflexive strategy of behavior to determine the optimal migration flow. 相似文献
42.
A. P. Sadovskii 《Differential Equations》2000,36(12):1812-1818
43.
The electronic structure of the recently discovered superconductor SrPt2As2 with T
c
= 5.2 K has been calculated in the local-density approximation. Despite its chemical composition and crystal structure are
somehow similar to FeAs-based high-temperature superconductors, the electronic structure of SrPt2As2 is very much different. The crystal structure is orthorhombic (or tetragonal if idealized) and has layered nature with alternating
PtAs4 and AsPt4 tetrahedra slabs sandwiched with Sr ions. The Fermi level is crossed by Pt-5d states with rather strong admixture of As-4p states. Fermi surface of SrPt2As2 is essentially three-dimensional, with complicated sheets corresponding to multiple bands. We compare SrPt2As2 with 1111 and 122 representatives of FeAs-class of superconductors, as well as with isovalent (Ba,Sr)Ni2As2 superconductors. Brief discussion of superconductivity in SrPt2As2 is also presented. 相似文献
44.
V. M. Fomin V. L. Ganimedov M. N. Mel’nikov M. I. Muchnaya A. S. Sadovskii V. I. Shepelenko 《Journal of Applied Mechanics and Technical Physics》2012,53(1):49-55
The air flow in the human nasal cavity is numerically modeled with the use of the clinical method of measuring of the nasal
cavity capacity. Results obtained in this study offer an explanation for the contradiction between the computed data and data
obtained during clinical measurements. 相似文献
45.
46.
A. I. Posazhennikova M. V. Sadovskii 《Journal of Experimental and Theoretical Physics》1999,88(2):347-355
We propose a simple model of the electron spectrum of a two-dimensional system with hot sections on the Fermi surface that
significantly transforms the spectral density (pseudogap) in these sections. Using this model, we set up a Ginzburg-Landau
expansion for s and d type Cooper pairing and analyze the effect of the pseudogap in the electron spectrum on the main properties of a superconductor.
Zh. éksp. Teor. Fiz. 115, 632–648 (February 1999) 相似文献
47.
For an analytic system with nonzero cubic part and with a degenerate monodromic singular point, we indicate an algorithm for constructing the asymptotic expansion of the Poincaré map. We present closed-form expressions for the first four focus quantities and find two necessary conditions for a center. 相似文献
48.
E. Z. Kuchinskii M. V. Sadovskii 《Journal of Experimental and Theoretical Physics》2006,103(3):415-427
We analyze the non-Fermi-liquid (NFL) behavior of the fluctuating gap model (FGM) of pseudogap behavior in both one and two
dimensions. A detailed discussion of quasiparticle renormalization (Z-factor) is given, demonstrating a kind of marginal Fermi-liquid
or Luttinger-liquid behavior and topological stability of the bare Fermi surface (the Luttinger theorem). In the two-dimensional
case, we discuss the effective picture of the Fermi surface destruction both in the hot spot model of dielectric (AFM, CDW)
pseudogap fluctuations and for the qualitatively different case of superconducting d-wave fluctuations, reflecting the NFL spectral density behavior and similar to that observed in ARPES experiments on copper
oxides.
The text was submitted by the authors in English. 相似文献
49.
E. Z. Kuchinskii I. A. Nekrasov Z. V. Pchelkina M. V. Sadovskii 《Journal of Experimental and Theoretical Physics》2007,104(5):792-804
Pseudogap phenomena are observed for the normal underdoped phase of different high-T
c cuprates. Among others, the Bi2Sr2CaCu2O8 − δ (Bi2212) compound is one of the most studied experimentally. To describe the pseudogap regime in Bi2212, we use a novel generalized
ab initio LDA + DMFT + Σk hybrid scheme. This scheme is based on the strategy of one of the most powerful computational tools for real correlated materials:
the local density approximation (LDA) + dynamical mean-field theory (DMFT). Conventional LDA + DMFT equations are here supplied
with an additional (momentum-dependent) self-energy Σk in the spirit of our recently proposed DMFT + Σk approach taking into account pseudogap fluctuations. In the present model, Σk describes nonlocal correlations induced by short-range collective Heisenberg-like antiferromagnetic spin fluctuations. The
effective single-impurity problem of the DMFT is solved by the numerical renormalization group (NRG) method. Material-specific
model parameters for the effective x
2 − y
2 orbital of Cu-3d shell of the Bi2212 compound, e.g., the values of intra-and interlayer hopping integrals between different Cu sites, the
local Coulomb interaction U, and the pseudogap potential Δ were obtained within the LDA and LDA + DMFT schemes. Here, we report
on the theoretical LDA + DMFT + Σk quasiparticle band dispersion and damping, Fermi surface renormalization, momentum anisotropy of (quasi)static scattering,
densities of states, spectral densities, and angular-resolved photoemission (ARPES) spectra, taking into account pseudogap
and bilayer splitting effects for normal (slightly) underdoped Bi2212 (δ = 0.15). We show that LDA + DMFT + Σk successfully describes strong (pseudogap) scattering close to Brillouin zone boundaries. Our calculated LDA + DMFT + Σk Fermi surfaces and ARPES spectra in the presence of pseudogap fluctuations are almost insensitive to the bilayer splitting
strength. However, our LDA-calculated value of bilayer splitting is rather small to describe the experimentally observed peak-dip-hump
structure. The results obtained are in good semiquantitative agreement with various recent ARPES experiments.
The article was submitted by the authors in English. 相似文献
50.