Onset of stochastic synchronization induced by diffusion processes in a generalized Duffing system

This paper gives the first results of a work in progress, in collaboration with G. Michaud and G. Vauclair. It is a first attempt to compute the effects of meridional circulation and turbulence on diffusion processes in stellar envelopes. Computations have been made for a 2 Mʘstar, which lies in the Am - δ Scuti region of the HR diagram.Let us recall that in Am stars diffusion cannot occur between the two outer convection zones, contrary to what was assumed by Watson (1970, 1971) and Smith (1971), since they are linked by overshooting (Latour, 1972; Toomre et al., 1975). But diffusion may occur at the bottom of the second convection zone. According to Vauclair et al. (1974), the second convection zone, due to He II ionization, disappears after a time equal to the helium diffusion time, and then diffusion may happen at the bottom of the first convection zone, so that the arguments by Watson and Smith are preserved.

Download Full-text

Ergodic Control of Diffusion Processes

10.1017/cbo9781139003605 ◽

2009 ◽

Cited By ~ 13

Author(s):

Ari Arapostathis ◽

Vivek S. Borkar ◽

Mrinal K. Ghosh

Keyword(s):

Diffusion Processes ◽

Ergodic Control

Download Full-text

THE STATIONARY DISTRIBUTIONS AND THE STEADY PROBABILITY CURRENTS OF ONE-DIMENSIONAL DIFFUSION PROCESSES UNDER NON-LOCAL BOUNDARY CONDITIONS

Acta Mathematica Scientia ◽

10.1016/s0252-9602(18)30713-6 ◽

1981 ◽

Vol 1 (2) ◽

pp. 195-206

Author(s):

Chengxun Wu ◽

Maozheng Guo

Keyword(s):

Boundary Conditions ◽

Diffusion Processes ◽

Stationary Distributions ◽

One Dimensional ◽

Local Boundary ◽

Dimensional Diffusion ◽

Non Local

Download Full-text

NMR-Study of Structure and Diffusion Processes in Li3N

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1980607 ◽

1980 ◽

Vol 41 (C6) ◽

pp. C6-28-C6-31 ◽

Cited By ~ 2

Author(s):

R. Messer ◽

H. Birli ◽

K. Differt

Keyword(s):

Diffusion Processes ◽

Nmr Study ◽

And Diffusion

Download Full-text

Relaxation Phenomena in Reaction-Diffusion Processes

Proceedings of the 15th International Heat Transfer Conference ◽

10.1615/ihtc15.cmb.009830 ◽

2014 ◽

Author(s):

Juan Ramos

Keyword(s):

Diffusion Processes ◽

Reaction Diffusion ◽

Relaxation Phenomena

Download Full-text

Prediction of Solutions of the Duffing System with Tuned Mass Damper

Mechanics and Mechanical Engineering ◽

10.2478/mme-2018-0078 ◽

2020 ◽

Vol 22 (4) ◽

pp. 983-990

Author(s):

Konrad Mnich

Keyword(s):

Dynamical System ◽

Duffing Oscillator ◽

Probabilistic Approach ◽

Nonlinear Dynamical System ◽

Tuned Mass Damper ◽

Nonlinear Dynamical ◽

Duffing System ◽

Mass Damper ◽

Basin Stability ◽

Stability Concept

AbstractIn this work we analyze the behavior of a nonlinear dynamical system using a probabilistic approach. We focus on the coexistence of solutions and we check how the changes in the parameters of excitation influence the dynamics of the system. For the demonstration we use the Duffing oscillator with the tuned mass absorber. We mention the numerous attractors present in such a system and describe how they were found with the method based on the basin stability concept.

Download Full-text

Effect of cluster-gradient architecture of nanostructured topocomposites on features of tribointeraction with heterophased material

10.36652/1813-1336-2020-16-3-130-135 ◽

2020 ◽

pp. 130-135

Author(s):

D.N. Korotaev ◽

K.N. Poleshchenko ◽

E.N. Eremin ◽

E.E. Tarasov

Keyword(s):

Wear Resistance ◽

Titanium Alloy ◽

Energy Dissipation ◽

Phase Structure ◽

Diffusion Processes ◽

Structural Phase ◽

High Wear Resistance ◽

Wear Characteristics ◽

And Diffusion

The wear resistance and wear characteristics of cluster-gradient architecture (CGA) nanostructured topocomposites are studied. The specifics of tribocontact interaction under microcutting conditions is considered. The reasons for retention of high wear resistance of this class of nanostructured topocomposites are studied. The mechanisms of energy dissipation from the tribocontact zone, due to the nanogeometry and the structural-phase structure of CGA topocomposites are analyzed. The role of triboactivated deformation and diffusion processes in providing increased wear resistance of carbide-based topocomposites is shown. They are tested under the conditions of blade processing of heat-resistant titanium alloy.

Download Full-text

The Influence of Isothermal Annealing and Structural Defects on Properties of Amorphous Fe78Si11B11 with High Magnetization Saturation

Revista de Chimie ◽

10.37358/rc.17.3.5482 ◽

2017 ◽

Vol 68 (3) ◽

pp. 478-482 ◽

Cited By ~ 1

Author(s):

Katarzyna Bloch

Keyword(s):

Numerical Analysis ◽

Thermal Treatment ◽

Saturation Magnetization ◽

Isothermal Annealing ◽

Diffusion Processes ◽

Structural Defects ◽

High Saturation Magnetization ◽

Magnetization Curves ◽

Magnetization Saturation ◽

Very High

This paper presents the results of numerical analysis of the primary magnetization curves, which were obtained under the assumptions of the theory of approach to ferromagnetic saturation described in by H. Kronm�ller. Test samples of the Fe78Si11B11 alloy were tape-shaped materials, which were subjected to isothermal annealing, not causing their crystallization. The investigated ribbons (tapes) were characterized by a very high saturation magnetization value of approximately 2T, which the thermal treatment has increased by about 10%. It was found that reason for the change of saturation magnetization of the investigated samples was the local rearrangement of atoms due to diffusion processes leading to the release of free volumes to the surface and combining of them into larger unstable defects called pseudodislocational dipoles.

Download Full-text