The Experts below are selected from a list of 96 Experts worldwide ranked by ideXlab platform

A. R. Bishop - One of the best experts on this subject based on the ideXlab platform.

  • Locked-to-running transition in the two-dimensional underdamped driven Frenkel-Kontorova model.
    Physical review. E Statistical nonlinear and soft matter physics, 2001
    Co-Authors: Oleg M. Braun, M V Paliy, J Röder, A. R. Bishop
    Abstract:

    We study the nonlinear dc response of a two-dimensional underdamped system of interacting atoms subject to an isotropic periodic external potential with triangular symmetry. We consider various values of the Effective Elastic Constant of the system, two different atomic interaction potentials, and different concentrations of atoms. In the case of a closely packed layer, when its structure is commensurate with the substrate, there is a locked-to-running transition as a function of the driving force, whose mechanism depends on the Effective Elastic Constant. For a low Elastic Constant, where the layer is weakly coupled, the transition is achieved via the creation of an avalanche of moving particles that leaves a depleted region in its wake. On increasing the Effective Elastic Constant the depleted region becomes less marked and there is a crossover to a scenario in which an island of moving particles nucleates the transition. In the case of a partially filled atomic layer, several dynamical phase transitions between states with different atomic mobility are observed. The mobility of atoms as a function of the external force can vary nonmonotonically with increasing force. For the case of a small external damping, the system can be trapped at a large force in an immobile metastable state, thus demonstrating a "fuse-safety device" on an atomic scale.

  • Locked-to-running transition in the two-dimensional underdamped driven Frenkel-Kontorova model.
    Physical Review E, 2001
    Co-Authors: Oleg M. Braun, M V Paliy, J Röder, A. R. Bishop
    Abstract:

    We study the nonlinear dc response of a two-dimensional underdamped system of interacting atoms subject to an isotropic periodic external potential with triangular symmetry. We consider various values of the Effective Elastic Constant of the system, two different atomic interaction potentials, and different concentrations of atoms. In the case of a closely packed layer, when its structure is commensurate with the substrate, there is a locked-to-running transition as a function of the driving force, whose mechanism depends on the Effective Elastic Constant. For a low Elastic Constant, where the layer is weakly coupled, the transition is achieved via the creation of an avalanche of moving particles that leaves a depleted region in its wake. On increasing the Effective Elastic Constant the depleted region becomes less marked and there is a crossover to a scenario in which an island of moving particles nucleates the transition. In the case of a partially filled atomic layer, several dynamical phase transitions between states with different atomic mobility are observed. The mobility of atoms as a function of the external force can vary nonmonotonically with increasing force. For the case of a small external damping, the system can be trapped at a large force inmore » an immobile metastable state, thus demonstrating a ''fuse-safety device'' on an atomic scale.« less

Oleg M. Braun - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic phases in the two-dimensional underdamped driven Frenkel-Kontorova model.
    Physical Review E, 2005
    Co-Authors: Jasmina Tekić, Oleg M. Braun, Bambi Hu
    Abstract:

    We study the nonlinear dc response of a two-dimensional underdamped system of interacting atoms subject to an isotropic periodic external potential with triangular symmetry. When driving force increases, the system transfers from a disorder locked state to an ordered sliding state corresponding to a moving crystal. By varying the values of the Effective Elastic Constant, damping, and temperature, we found different scenarios and intermediate phases during the ordering transition. For a soft atomic layer, the system passes through a plastic-channel regime that appears as a steady-state regime at higher values of the damping coefficient. For high values of the Effective Elastic Constant, when the atomic layer is stiff, the intermediate plastic phase corresponds to a traffic-jam regime with immobile islands in the sea of running atoms. At a high driving of the stiff layer, a solitonlike Elastic flow of atoms has been observed.

  • Locked-to-running transition in the two-dimensional underdamped driven Frenkel-Kontorova model.
    Physical review. E Statistical nonlinear and soft matter physics, 2001
    Co-Authors: Oleg M. Braun, M V Paliy, J Röder, A. R. Bishop
    Abstract:

    We study the nonlinear dc response of a two-dimensional underdamped system of interacting atoms subject to an isotropic periodic external potential with triangular symmetry. We consider various values of the Effective Elastic Constant of the system, two different atomic interaction potentials, and different concentrations of atoms. In the case of a closely packed layer, when its structure is commensurate with the substrate, there is a locked-to-running transition as a function of the driving force, whose mechanism depends on the Effective Elastic Constant. For a low Elastic Constant, where the layer is weakly coupled, the transition is achieved via the creation of an avalanche of moving particles that leaves a depleted region in its wake. On increasing the Effective Elastic Constant the depleted region becomes less marked and there is a crossover to a scenario in which an island of moving particles nucleates the transition. In the case of a partially filled atomic layer, several dynamical phase transitions between states with different atomic mobility are observed. The mobility of atoms as a function of the external force can vary nonmonotonically with increasing force. For the case of a small external damping, the system can be trapped at a large force in an immobile metastable state, thus demonstrating a "fuse-safety device" on an atomic scale.

  • Locked-to-running transition in the two-dimensional underdamped driven Frenkel-Kontorova model.
    Physical Review E, 2001
    Co-Authors: Oleg M. Braun, M V Paliy, J Röder, A. R. Bishop
    Abstract:

    We study the nonlinear dc response of a two-dimensional underdamped system of interacting atoms subject to an isotropic periodic external potential with triangular symmetry. We consider various values of the Effective Elastic Constant of the system, two different atomic interaction potentials, and different concentrations of atoms. In the case of a closely packed layer, when its structure is commensurate with the substrate, there is a locked-to-running transition as a function of the driving force, whose mechanism depends on the Effective Elastic Constant. For a low Elastic Constant, where the layer is weakly coupled, the transition is achieved via the creation of an avalanche of moving particles that leaves a depleted region in its wake. On increasing the Effective Elastic Constant the depleted region becomes less marked and there is a crossover to a scenario in which an island of moving particles nucleates the transition. In the case of a partially filled atomic layer, several dynamical phase transitions between states with different atomic mobility are observed. The mobility of atoms as a function of the external force can vary nonmonotonically with increasing force. For the case of a small external damping, the system can be trapped at a large force inmore » an immobile metastable state, thus demonstrating a ''fuse-safety device'' on an atomic scale.« less

Ryuichi Togawa - One of the best experts on this subject based on the ideXlab platform.

  • Multiple scattering of antiplane shear waves in a fiber-reinforced composite medium with interfacial layers
    International Journal of Solids and Structures, 1998
    Co-Authors: Yasuhide Shindo, Naoki Niwa, Ryuichi Togawa
    Abstract:

    This paper deals with the scattering of antiplane shear waves in a metal matrix composite reinforced by fibers with interfacial layers. We assume same-size cylindrical inclusions and same-thickness interface layers with nonhomogeneous Elastic properties. The Effective complex wave numbers follow from the coherent wave equation which depends only upon the scattering amplitude of the single scattering problem. Effective Elastic Constants can be obtained from phase velocities of coherent waves. Numerical calculations for an SiC-fiber-reinforced Al composite are carried out, and the effect of interface properties on scattering cross section, phase velocity, attenuation of coherent plane wave, and Effective Elastic Constant is shown graphically.

Bambi Hu - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic phases in the two-dimensional underdamped driven Frenkel-Kontorova model.
    Physical Review E, 2005
    Co-Authors: Jasmina Tekić, Oleg M. Braun, Bambi Hu
    Abstract:

    We study the nonlinear dc response of a two-dimensional underdamped system of interacting atoms subject to an isotropic periodic external potential with triangular symmetry. When driving force increases, the system transfers from a disorder locked state to an ordered sliding state corresponding to a moving crystal. By varying the values of the Effective Elastic Constant, damping, and temperature, we found different scenarios and intermediate phases during the ordering transition. For a soft atomic layer, the system passes through a plastic-channel regime that appears as a steady-state regime at higher values of the damping coefficient. For high values of the Effective Elastic Constant, when the atomic layer is stiff, the intermediate plastic phase corresponds to a traffic-jam regime with immobile islands in the sea of running atoms. At a high driving of the stiff layer, a solitonlike Elastic flow of atoms has been observed.

J Röder - One of the best experts on this subject based on the ideXlab platform.

  • Locked-to-running transition in the two-dimensional underdamped driven Frenkel-Kontorova model.
    Physical review. E Statistical nonlinear and soft matter physics, 2001
    Co-Authors: Oleg M. Braun, M V Paliy, J Röder, A. R. Bishop
    Abstract:

    We study the nonlinear dc response of a two-dimensional underdamped system of interacting atoms subject to an isotropic periodic external potential with triangular symmetry. We consider various values of the Effective Elastic Constant of the system, two different atomic interaction potentials, and different concentrations of atoms. In the case of a closely packed layer, when its structure is commensurate with the substrate, there is a locked-to-running transition as a function of the driving force, whose mechanism depends on the Effective Elastic Constant. For a low Elastic Constant, where the layer is weakly coupled, the transition is achieved via the creation of an avalanche of moving particles that leaves a depleted region in its wake. On increasing the Effective Elastic Constant the depleted region becomes less marked and there is a crossover to a scenario in which an island of moving particles nucleates the transition. In the case of a partially filled atomic layer, several dynamical phase transitions between states with different atomic mobility are observed. The mobility of atoms as a function of the external force can vary nonmonotonically with increasing force. For the case of a small external damping, the system can be trapped at a large force in an immobile metastable state, thus demonstrating a "fuse-safety device" on an atomic scale.

  • Locked-to-running transition in the two-dimensional underdamped driven Frenkel-Kontorova model.
    Physical Review E, 2001
    Co-Authors: Oleg M. Braun, M V Paliy, J Röder, A. R. Bishop
    Abstract:

    We study the nonlinear dc response of a two-dimensional underdamped system of interacting atoms subject to an isotropic periodic external potential with triangular symmetry. We consider various values of the Effective Elastic Constant of the system, two different atomic interaction potentials, and different concentrations of atoms. In the case of a closely packed layer, when its structure is commensurate with the substrate, there is a locked-to-running transition as a function of the driving force, whose mechanism depends on the Effective Elastic Constant. For a low Elastic Constant, where the layer is weakly coupled, the transition is achieved via the creation of an avalanche of moving particles that leaves a depleted region in its wake. On increasing the Effective Elastic Constant the depleted region becomes less marked and there is a crossover to a scenario in which an island of moving particles nucleates the transition. In the case of a partially filled atomic layer, several dynamical phase transitions between states with different atomic mobility are observed. The mobility of atoms as a function of the external force can vary nonmonotonically with increasing force. For the case of a small external damping, the system can be trapped at a large force inmore » an immobile metastable state, thus demonstrating a ''fuse-safety device'' on an atomic scale.« less