189 research outputs found
Exact Travelling Wave Solutions of Some Nonlinear Nonlocal Evolutionary Equations
Direct algebraic method of obtaining exact solutions to nonlinear PDE's is
applied to certain set of nonlinear nonlocal evolutionary equations, including
nonlinear telegraph equation, hyperbolic generalization of Burgers equation and
some spatially nonlocal hydrodynamic-type model. Special attention is paid to
the construction of the kink-like and soliton-like solutions.Comment: 13 pages, LaTeX2
Analytical description of the coherent structures within the hyperbolic generalization of Burgers equation
We present new periodic, kink-like and soliton-like travelling wave solutions
to the hyperbolic generalization of Burgers equation. To obtain them, we employ
the classical and generalized symmetry methods and the ansatz-based approachComment: 12 pages, 8 figure
Damage production in atomic displacement cascades in beryllium
AbstractThe paper presents the results of a molecular dynamics simulation of cascade damage production in beryllium caused by self-ion recoils in the energy range of 0.5–3keV. It is demonstrated that point defects are produced in Be preferentially in well-separated subcascades generated by secondary and higher order recoils. A linear dependence of the point defect number on the primary recoil energy is obtained with the slope that corresponds to formal atom displacement energy of ∼21eV. Most of the damage is created as single defects and the relatively high part of created point defects (∼50%) survives the correlated recombination following the ballistic cascade stage and becomes freely-migrating
On the localized wave patterns supported by convection-reaction-diffusion equation
A set of traveling wave solution to convection-reaction-diffusion equation is
studied by means of methods of local nonlinear analysis and numerical
simulation. It is shown the existence of compactly supported solutions as well
as solitary waves within this family for wide range of parameter values
Exact Solution of the Hyperbolic Generalization of Burgers Equation, Describing Travelling Fronts and their Interaction
We present new analytical solutions to the hyperbolic generalization of
Burgers equation, describing interaction of the wave fronts. To obtain them, we
employ a modified version of the Hirota method.Comment: 12 pages, 3 figure
Constructing Soliton and Kink Solutions of PDE Models in Transport and Biology
We present a review of our recent works directed towards discovery of a periodic, kink-like and soliton-like travelling wave solutions within the models of transport phenomena and the mathematical biology. Analytical description of these wave patterns is carried out by means of our modification of the direct algebraic balance method. In the case when the analytical description fails, we propose to approximate invariant travelling wave solutions by means of an infinite series of exponential functions. The effectiveness of the method of approximation is demonstrated on a hyperbolic modification of Burgers equation
Compacton-like solutions of the hydrodynamic system describing relaxing media
We show the existence of a compacton-like solutions within the relaxing
hydrodynamic-type model and perform numerical study of attracting features of
these solutions
On the motifs distribution in random hierarchical networks
The distribution of motifs in random hierarchical networks defined by
nonsymmetric random block--hierarchical adjacency matrices, is constructed for
the first time. According to the classification of U. Alon et al of network
superfamilies by their motifs distributions, our artificial directed random
hierarchical networks falls into the superfamily of natural networks to which
the class of neuron networks belongs. This is the first example of ``handmade''
networks with the motifs distribution as in a special class of natural networks
of essential biological importance.Comment: 7 pages, 5 figure
Nuclear emulsion with molybdenum filling for observation of decay
The usage of nuclear emulsion with molybdenum filling for observation of
decay are shown to be possible. Estimates for 1 kg of Mo
with zero background give the sensitivity for the decay of
Mo at the level of y for 1 year of measurement.Comment: 7 pages, 3 figure
Supersymmetric null-surfaces
Single trace operators with the large R-charge in supersymmetric Yang-Mills
theory correspond to the null-surfaces in . We argue that the
moduli space of the null-surfaces is the space of contours in the
super-Grassmanian parametrizing the complex -dimensional subspaces of
the complex -dimensional space. The odd coordinates on this
super-Grassmanian correspond to the fermionic degrees of freedom of the
superstring.Comment: v4: added a reference to the earlier work; corrected the formula for
the stabilizer of the BMN vacuum; added the discussion of the complex
structure of the odd coordinates in Section 3.
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