The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform

Shan-qiang Qin - One of the best experts on this subject based on the ideXlab platform.

  • Neural Network for Mapping Full Time Apparent Resistivity Solution from TEM Electromotive Force Data
    DEStech Transactions on Computer Science and Engineering, 2018
    Co-Authors: Ming-hui Bao, Shan-qiang Qin
    Abstract:

    The apparent resistivity of the induced Electromotive Force observed by the transient electromagnetic (TEM) in center loop is proposed by using the neural network. According to the characteristics of increasing of the induced Electromotive Force with the resistivity of the transient electromagnetic sounding, the neural network input and output relationship and the network structure of the transient electromagnetic induction Electromotive Force response are designed according to the uniform half space central line observation mode. The nonlinear model of transient electromagnetic induction Electromotive Force and apparent resistivity is fitted by the neural network to obtain the full apparent resistivity value of the measured induced Electromotive Force data at a certain sampling time, and the aim of resistivity and imaging is achieved quickly. Through the calculation and verification of the simulation model of the transient electromagnetic in grounding grids, the apparent resistivity section can be obtained, and the position of the breakpoint can be clearly determined, and the effect of solving the inverse problem is achieved. The calculation of the verification model shows that the method makes the calculation time of the transient electromagnetic apparent resistivity greatly shorten, which is a practical algorithm.

James L Erskine - One of the best experts on this subject based on the ideXlab platform.

  • universal Electromotive Force induced by domain wall motion
    Physical Review Letters, 2009
    Co-Authors: Shengyuan A Yang, Geoffrey S D Beach, Carl Knutson, Di Xiao, Qian Niu, Maxim Tsoi, James L Erskine
    Abstract:

    The Electromotive Force induced by a moving magnetic domain wall in a nanostrip has been calculated theoretically and detected experimentally. It is found that the emf depends only on the domain wall transformation frequency through a universal Josephson type relation, which is closely related to the topological nature of the domain wall. Our experimental measurements confirm the theoretical prediction.

Arash Phirouznia - One of the best experts on this subject based on the ideXlab platform.

  • Emergence of Electromotive Force by time dependent gauge fields in monolayer graphene
    Superlattices and Microstructures, 2017
    Co-Authors: Tohid Farajollahpour, Arash Phirouznia
    Abstract:

    Abstract We propose a valley-dependent Electromotive Force in a graphene device based on a deformed graphene in the presence of magnetic field. The coexistence of the strain and magnetic field in the presented mechanism leads to a valley dependent Electromotive Force in zero Fermi energy. In the non-zero Fermi energies strain alone could induce a valley dependent Electromotive Force while the magnetic field alone could not induce any Electromotive Force in zero and any level of Fermi energy. The calculations are based on the Berry curvature approaches.

  • Emergence of Electromotive Force in precession-less rigid motion of deformed domain wall
    The European Physical Journal B, 2016
    Co-Authors: Tohid Farajollahpour, N. Darmiani, Arash Phirouznia
    Abstract:

    Recently it has been recognized that the Electromotive Force (emf) can be induced just by the spin precession where the generation of the Electromotive Force has been considered as a real-space topological pumping effect. It has been shown that the amount of the Electromotive Force is independent of the functionality of the localized moments. It was also demonstrated that the rigid domain wall (DW) motion cannot generate Electromotive Force in the system. Based on real-space topological pumping approach in the current study we show that the Electromotive Force can be induced by rigid motion of a deformed DW. We also demonstrate that the generated Electromotive Force strongly depends on the DW bulging. Meanwhile results show that the DW bulging leads to generation of the Electromotive Force both along the axis of the DW motion and normal to the direction of motion.

  • The role of the Rashba coupling and domain wall bulging on dynamical induced Electromotive Force: A Berry curvature investigation
    2015
    Co-Authors: N. Darmiani, Tohid Farajollahpour, Arash Phirouznia
    Abstract:

    Recently it has been recognized that the Electromotive Force (emf) can be induced just by the spin precession where the generation of the Electromotive Force has been considered as a real-space topological pumping effect. It has been shown that the amount of the Electromotive Force is independent of the functionality of the localized moments. It was also demonstrated that the rigid domain wall (DW) motion cannot generate Electromotive Force in the system. Based on real-space topological pumping approach in the current study we show that the Electromotive Force can be induced by rigid motion of a deformed DW. We also demonstrate that the generated Electromotive Force strongly depends on the DW bulging. Meanwhile results show that the DW bulging leads to generation of the Electromotive Force both along the axis of the DW motion and normal to the direction of motion.

  • The role of the Rashba coupling on dynamical induced Electromotive Force: A Berry curvature investigation
    arXiv: Mesoscale and Nanoscale Physics, 2015
    Co-Authors: N. Darmiani, Tohid Farajollahpour, Arash Phirouznia
    Abstract:

    A Berry curvature investigation has been made on the magnetic modulated structures such as domain walls (DWs) and helimagnetic spin configurations. Results of the present study shows that the geometry of the spin configuration and the direction of the magnetic field creating the spin precession are of crucial importance in the magnitude of obtained Electromotive Force. It has recently been recognized that the Rashba coupling increases significantly the Electromotive Force when this coupling is high enough to give predominant contribution in the magnetization dynamics. However, in the opposite case when the Rashba interaction has negligible contribution in the magnetization dynamics it was shown that the magnitude of the Electromotive Force decreases by increasing the Rashba coupling strength. Therefore the effect of the Rashba interaction in the Electromotive Force of the moving DWs rests largely on the strength and also effectiveness of this interaction in the magnetization dynamics.

Ming-hui Bao - One of the best experts on this subject based on the ideXlab platform.

  • Neural Network for Mapping Full Time Apparent Resistivity Solution from TEM Electromotive Force Data
    DEStech Transactions on Computer Science and Engineering, 2018
    Co-Authors: Ming-hui Bao, Shan-qiang Qin
    Abstract:

    The apparent resistivity of the induced Electromotive Force observed by the transient electromagnetic (TEM) in center loop is proposed by using the neural network. According to the characteristics of increasing of the induced Electromotive Force with the resistivity of the transient electromagnetic sounding, the neural network input and output relationship and the network structure of the transient electromagnetic induction Electromotive Force response are designed according to the uniform half space central line observation mode. The nonlinear model of transient electromagnetic induction Electromotive Force and apparent resistivity is fitted by the neural network to obtain the full apparent resistivity value of the measured induced Electromotive Force data at a certain sampling time, and the aim of resistivity and imaging is achieved quickly. Through the calculation and verification of the simulation model of the transient electromagnetic in grounding grids, the apparent resistivity section can be obtained, and the position of the breakpoint can be clearly determined, and the effect of solving the inverse problem is achieved. The calculation of the verification model shows that the method makes the calculation time of the transient electromagnetic apparent resistivity greatly shorten, which is a practical algorithm.

Shengyuan A Yang - One of the best experts on this subject based on the ideXlab platform.

  • universal Electromotive Force induced by domain wall motion
    Physical Review Letters, 2009
    Co-Authors: Shengyuan A Yang, Geoffrey S D Beach, Carl Knutson, Di Xiao, Qian Niu, Maxim Tsoi, James L Erskine
    Abstract:

    The Electromotive Force induced by a moving magnetic domain wall in a nanostrip has been calculated theoretically and detected experimentally. It is found that the emf depends only on the domain wall transformation frequency through a universal Josephson type relation, which is closely related to the topological nature of the domain wall. Our experimental measurements confirm the theoretical prediction.