The Experts below are selected from a list of 19683 Experts worldwide ranked by ideXlab platform

Laurence Ramos - One of the best experts on this subject based on the ideXlab platform.

  • Impact of solid and liquids balls on a solid surface: a unified description
    Bulletin of the American Physical Society, 2017
    Co-Authors: Christian Ligoure, Srishti Arora, Jean-marc Fromental, Serge Mora, Ty Phou, Laurence Ramos
    Abstract:

    We study experimentally the impact of ultra soft spherical gel balls of millimetric size d0 on a rigid substrate covered by a thin layer of liquid nitrogen to avoid viscous dissipation .The balls largely deform like a pancake at high impact velocities. We measure the maximally deformed size dmax and the the time needed to reach this maximal size after impact Tmax, versus the impact velocity Ui for various elastic moduli . We do the same type of experiments with liquid droplets of various surface tensions . The experiments reveal a universal scaling behavior of the maximum deformation $\d_{max}/d_0}$ of both solid balls and liquid drops provided that both bulk and surface elasticity are properly taken into account. Moreover, we show that , in absence of viscous dissipation, the dynamics of the System can be understood as a conventional Spring-Mass System with a stiffness given by a combination of surface tension and bulk elasticity and a Mass given by that of the ball (or drop) ; the deformation of the small ball (drop) during the impact linearly depends on the impact velocity, and the contact time scales as the period of this Spring-Mass System.

  • Impact of solid and liquid balls on a solid surface: an unified description
    2017
    Co-Authors: Srishti Arora, Jean-marc Fromental, Serge Mora, Ty Phou, Laurence Ramos, Christian Ligoure
    Abstract:

    We study experimentally the impact of ultra soft spherical gel balls of millimetric size d0 on a rigid substrate covered by a thin layer of liquid nitrogen to avoid viscous dissipation .The balls largely deform like a pancake at high impact velocities. We measure the maximally deformed size dmax and the the time needed to reach this maximal size after impact Tmax, versus the impact velocity Ui for various elastic moduli . We do the same type of experiments with liquid droplets of various surface tensions . The experiments reveal a universal scaling behavior of the maximum deformation $\d_{max}/d_0}$ of both solid balls and liquid drops provided that both bulk and surface elasticity are properly taken into account. Moreover, we show that , in absence of viscous dissipation, the dynamics of the System can be understood as a conventional Spring-Mass System with a stiffness given by a combination of surface tension and bulk elasticity and a Mass given by that of the ball (or drop) ; the deformation of the small ball (drop) during the impact linearly depends on the impact velocity, and the contact time scales as the period of this Spring-Mass System.

Daniel F. Sievenpiper - One of the best experts on this subject based on the ideXlab platform.

  • Topologically protected pseudospins in 2D Spring-Mass System
    New Journal of Physics, 2018
    Co-Authors: Yun Zhou, Prabhakar R. Bandaru, Daniel F. Sievenpiper
    Abstract:

    It is proposed that a lattice, with constituent Masses and Spring constants, may be considered as a model System for topological matter. For instance, a relative variation of the inter- and intra-unit cell Spring constants can be used to create, tune, and invert band structure. Such an aspect is obtained while preserving time reversal symmetry, and consequently emulates the quantum spin Hall effect. The modal displacement fields of the Mass-Spring lattice were superposed so to yield pseudospin fields, with positive or negative group velocity. Considering that harmonic oscillators are the basis of classical and quantum excitations over a range of physical Systems, the Spring-Mass System yields further insight into the constituents and possible utility of topological material.

  • quantum spin hall topological insulator in a Spring Mass System
    New Journal of Physics, 2018
    Co-Authors: Yun Zhou, Prabhakar R. Bandaru, Daniel F. Sievenpiper
    Abstract:

    It is proposed that a lattice, with constituent Masses and Spring constants, may be considered as a model System for topological matter. For instance, a relative variation of the inter- and intra-unit cell Spring constants can be used to create, tune, and invert band structure. Such an aspect is obtained while preserving time reversal symmetry, and consequently emulates the quantum spin Hall effect. The modal displacement fields of the Mass-Spring lattice were superposed so to yield pseudospin fields, with positive or negative group velocity. Considering that harmonic oscillators are the basis of classical and quantum excitations over a range of physical Systems, the Spring-Mass System yields further insight into the constituents and possible utility of topological material.

Christian Ligoure - One of the best experts on this subject based on the ideXlab platform.

  • Impact of solid and liquids balls on a solid surface: a unified description
    Bulletin of the American Physical Society, 2017
    Co-Authors: Christian Ligoure, Srishti Arora, Jean-marc Fromental, Serge Mora, Ty Phou, Laurence Ramos
    Abstract:

    We study experimentally the impact of ultra soft spherical gel balls of millimetric size d0 on a rigid substrate covered by a thin layer of liquid nitrogen to avoid viscous dissipation .The balls largely deform like a pancake at high impact velocities. We measure the maximally deformed size dmax and the the time needed to reach this maximal size after impact Tmax, versus the impact velocity Ui for various elastic moduli . We do the same type of experiments with liquid droplets of various surface tensions . The experiments reveal a universal scaling behavior of the maximum deformation $\d_{max}/d_0}$ of both solid balls and liquid drops provided that both bulk and surface elasticity are properly taken into account. Moreover, we show that , in absence of viscous dissipation, the dynamics of the System can be understood as a conventional Spring-Mass System with a stiffness given by a combination of surface tension and bulk elasticity and a Mass given by that of the ball (or drop) ; the deformation of the small ball (drop) during the impact linearly depends on the impact velocity, and the contact time scales as the period of this Spring-Mass System.

  • Impact of solid and liquid balls on a solid surface: an unified description
    2017
    Co-Authors: Srishti Arora, Jean-marc Fromental, Serge Mora, Ty Phou, Laurence Ramos, Christian Ligoure
    Abstract:

    We study experimentally the impact of ultra soft spherical gel balls of millimetric size d0 on a rigid substrate covered by a thin layer of liquid nitrogen to avoid viscous dissipation .The balls largely deform like a pancake at high impact velocities. We measure the maximally deformed size dmax and the the time needed to reach this maximal size after impact Tmax, versus the impact velocity Ui for various elastic moduli . We do the same type of experiments with liquid droplets of various surface tensions . The experiments reveal a universal scaling behavior of the maximum deformation $\d_{max}/d_0}$ of both solid balls and liquid drops provided that both bulk and surface elasticity are properly taken into account. Moreover, we show that , in absence of viscous dissipation, the dynamics of the System can be understood as a conventional Spring-Mass System with a stiffness given by a combination of surface tension and bulk elasticity and a Mass given by that of the ball (or drop) ; the deformation of the small ball (drop) during the impact linearly depends on the impact velocity, and the contact time scales as the period of this Spring-Mass System.

Huizong Feng - One of the best experts on this subject based on the ideXlab platform.

  • An extended microscopic traffic flow model based on the Spring-Mass System theory
    Modern Physics Letters B, 2017
    Co-Authors: Wenbo Chen, Taixiong Zheng, Srinivas Peeta, Huizong Feng
    Abstract:

    This study proposes a new microscopic traffic flow model based on the Spring-Mass System theory. In particular, considering the similarity between the acceleration or deceleration behavior in traffic flow and the scaling properties of a Spring, a car-following (CF) model is proposed based on the fundamental physical law of the Spring-Mass System. Stability of the proposed model is analyzed using the perturbation method to obtain the stability condition. Numerical experiments are performed through simulation. The results demonstrate the proposed model can capture the characteristic of propagation backwards of disturbance in traffic flow. In addition, the findings of this study provide insights in modeling traffic flow from the mechanical System theory perspective.

  • An extended microscopic traffic flow model based on the Spring-Mass System theory
    Modern Physics Letters B, 2017
    Co-Authors: Yongfu Li, Taixiong Zheng, Xiaozheng He, Srinivas Peeta, Wenbo Chen, Huizong Feng
    Abstract:

    This study proposes a new microscopic traffic flow model based on the Spring-Mass System theory. In particular, considering the similarity between the acceleration or deceleration behavior in traffic flow and the scaling properties of a Spring, a car-following (CF) model is proposed based on the fundamental physical law of the Spring-Mass System. Stability of the proposed model is analyzed using the perturbation method to obtain the stability condition. Numerical experiments are performed through simulation. The results demonstrate the proposed model can capture the characteristic of propagation backwards of disturbance in traffic flow. In addition, the findings of this study provide insights in modeling traffic flow from the mechanical System theory perspective.

Yun Zhou - One of the best experts on this subject based on the ideXlab platform.

  • Topologically protected pseudospins in 2D Spring-Mass System
    New Journal of Physics, 2018
    Co-Authors: Yun Zhou, Prabhakar R. Bandaru, Daniel F. Sievenpiper
    Abstract:

    It is proposed that a lattice, with constituent Masses and Spring constants, may be considered as a model System for topological matter. For instance, a relative variation of the inter- and intra-unit cell Spring constants can be used to create, tune, and invert band structure. Such an aspect is obtained while preserving time reversal symmetry, and consequently emulates the quantum spin Hall effect. The modal displacement fields of the Mass-Spring lattice were superposed so to yield pseudospin fields, with positive or negative group velocity. Considering that harmonic oscillators are the basis of classical and quantum excitations over a range of physical Systems, the Spring-Mass System yields further insight into the constituents and possible utility of topological material.

  • quantum spin hall topological insulator in a Spring Mass System
    New Journal of Physics, 2018
    Co-Authors: Yun Zhou, Prabhakar R. Bandaru, Daniel F. Sievenpiper
    Abstract:

    It is proposed that a lattice, with constituent Masses and Spring constants, may be considered as a model System for topological matter. For instance, a relative variation of the inter- and intra-unit cell Spring constants can be used to create, tune, and invert band structure. Such an aspect is obtained while preserving time reversal symmetry, and consequently emulates the quantum spin Hall effect. The modal displacement fields of the Mass-Spring lattice were superposed so to yield pseudospin fields, with positive or negative group velocity. Considering that harmonic oscillators are the basis of classical and quantum excitations over a range of physical Systems, the Spring-Mass System yields further insight into the constituents and possible utility of topological material.