The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform

Sergey Vyazovkin - One of the best experts on this subject based on the ideXlab platform.

  • evaluation of activation energy of thermally stimulated solid state reactions under Arbitrary Variation of temperature
    Journal of Computational Chemistry, 1997
    Co-Authors: Sergey Vyazovkin
    Abstract:

    The thermal effect of a reaction makes the temperature inside the reaction system deviate from a prescribed heating program. To take into account the effect of such temperature deviations on kinetic evaluations, a computational method applicable to an Arbitrary Variation in temperature has been developed. The method combines the isoconversional principle of evaluating the activation energy with numerical integration of the equation, dα/dt = k[T(t)]f(α), over the actual Variation of the temperature with the time, T(t). Details of the numerical algorithm are reported. A model example has been used to verify the reliability of this method as compared to an analogous method which does not account for the deviations of the temperature from a prescribed program. The method has been tested for tolerance for noise in the temperature. © 1997 by John Wiley & Sons, Inc.

  • Evaluation of activation energy of thermally stimulated solid‐state reactions under Arbitrary Variation of temperature
    Journal of Computational Chemistry, 1997
    Co-Authors: Sergey Vyazovkin
    Abstract:

    The thermal effect of a reaction makes the temperature inside the reaction system deviate from a prescribed heating program. To take into account the effect of such temperature deviations on kinetic evaluations, a computational method applicable to an Arbitrary Variation in temperature has been developed. The method combines the isoconversional principle of evaluating the activation energy with numerical integration of the equation, dα/dt = k[T(t)]f(α), over the actual Variation of the temperature with the time, T(t). Details of the numerical algorithm are reported. A model example has been used to verify the reliability of this method as compared to an analogous method which does not account for the deviations of the temperature from a prescribed program. The method has been tested for tolerance for noise in the temperature. © 1997 by John Wiley & Sons, Inc.

  • Advanced isoconversional method
    Journal of thermal analysis, 1997
    Co-Authors: Sergey Vyazovkin
    Abstract:

    A nonlinear algorithm has been suggested to increase the accuracy of evaluating the activation energy by the integral isoconversional method. A minor modification of the algorithm has made it possible to adapt the isoconversional method for an Arbitrary Variation of the temperature. This advanced isoconversional method allows for trustworthy estimates of the activation energy when the thermal effect of a reaction makes the temperature of a sample deviate from a prescribed heating program.

Robin Stanley Johnson - One of the best experts on this subject based on the ideXlab platform.

  • an exact steady purely azimuthal equatorial flow with a free surface
    Journal of Physical Oceanography, 2016
    Co-Authors: Adrian Constantin, Robin Stanley Johnson
    Abstract:

    AbstractThe general problem of an ocean on a rotating sphere is considered. The governing equations for an inviscid, incompressible fluid, written in spherical coordinates that are fixed at a point on the rotating Earth, together with the free surface and rigid bottom boundary conditions, are introduced. An exact solution of this system is presented; this describes a steady flow that is moving only in the azimuthal direction, with no Variation in this direction. However, this azimuthal velocity component has an Arbitrary Variation with depth (i.e., radius), and so, for example, an Equatorial Undercurrent (EUC) can be accommodated. The pressure boundary condition at the free surface relates this pressure to the shape of the surface via a Bernoulli relation; this provides the constraint on the existence of a solution, although the restrictions are somewhat involved in spherical coordinates. To examine this constraint in more detail, the corresponding problems in model cylindrical coordinates (with the equat...

Yoshinobu Tanigawa - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic and quasi-static behaviors of magneto-thermo-elastic stresses in a conducting hollow circular cylinder subjected to an Arbitrary Variation of magnetic field
    International Journal of Mechanical Sciences, 2008
    Co-Authors: Masahiro Higuchi, Ryuusuke Kawamura, Yoshinobu Tanigawa
    Abstract:

    In the present paper, dynamic and quasi-static behaviors of magneto-thermo-elastic stresses in a conducting hollow circular cylinder subjected to an Arbitrary Variation of magnetic field are investigated. It is assumed that a magnetic field defined by an Arbitrary function of time acts on the outer surface in the direction parallel to its surface. Fundamental equations of plane axisymmetrical electromagnetic, temperature and elastic fields are formulated. Then, solutions of magnetic field, eddy current, temperature change and both dynamic solutions and quasi-static ones of stresses and deformations are analytically derived in the forms including the Arbitrary function. The solutions of stresses are determined to be sums of thermal stress caused by eddy current loss and magnetic stress caused by Lorentz force. For the case that the Arbitrary function is given by the sine function, the dynamic and quasi-static behaviors of the stresses are examined by numerical calculations.

  • Dynamic and quasi-static behaviors of magneto-thermo-elastic stresses in a conducting infinite plate subjected to an Arbitrary Variation of magnetic field
    Acta Mechanica, 2007
    Co-Authors: Masahiro Higuchi, Ryuusuke Kawamura, Yoshinobu Tanigawa, H. Fujieda
    Abstract:

    In the present paper, dynamic and quasi-static behaviors of magneto-thermo-elastic stresses in a conducting infinite plate subjected to an Arbitrary Variation of the magnetic field are investigated. It is assumed that a magnetic field defined by an Arbitrary function of time acts on both side surfaces of the infinite plate in the direction parallel to its surfaces. Fundamental equations of one-dimensional electromagnetic, temperature and elastic fields are formulated. Then, solutions of magnetic field, eddy current, temperature change and both dynamic solutions and quasi-static ones of stresses and deformations in the infinite plate are derived analytically. The solutions of stresses are determined to be sums of thermal stress caused by eddy current loss and magnetic stress caused by Lorentz force. For the case that the Arbitrary function is given by the sine function, the dynamic and quasi-static behaviors of the stresses are examined by numerical calculations.

  • Dynamic and Quasi-Static Behaviors of Magneto-Thermo-Elastic Stresses in a Conducting Solid Circular Cylinder Subjected to an Arbitrary Variation of Magnetic Field
    Journal of Thermal Stresses, 2007
    Co-Authors: Masahiro Higuchi, Ryuusuke Kawamura, Yoshinobu Tanigawa
    Abstract:

    In the present article, dynamic and quasi-static behaviors of magneto-thermo-elastic stresses in a conducting solid circular cylinder subjected to an Arbitrary Variation of magnetic field are investigated. It is assumed that a magnetic field defined by an Arbitrary function of time acts on the surface in the direction parallel to its surface. Dynamic and quasi-static solutions of stresses are analytically derived. The solutions of stresses are determined to be sums of thermal stress caused by eddy current loss and magnetic stress caused by Lorentz force. For the case that the Arbitrary function is given by the sine function, the dynamic and quasi-static behaviors of the stresses are examined by numerical calculations.

Adrian Constantin - One of the best experts on this subject based on the ideXlab platform.

  • an exact steady purely azimuthal equatorial flow with a free surface
    Journal of Physical Oceanography, 2016
    Co-Authors: Adrian Constantin, Robin Stanley Johnson
    Abstract:

    AbstractThe general problem of an ocean on a rotating sphere is considered. The governing equations for an inviscid, incompressible fluid, written in spherical coordinates that are fixed at a point on the rotating Earth, together with the free surface and rigid bottom boundary conditions, are introduced. An exact solution of this system is presented; this describes a steady flow that is moving only in the azimuthal direction, with no Variation in this direction. However, this azimuthal velocity component has an Arbitrary Variation with depth (i.e., radius), and so, for example, an Equatorial Undercurrent (EUC) can be accommodated. The pressure boundary condition at the free surface relates this pressure to the shape of the surface via a Bernoulli relation; this provides the constraint on the existence of a solution, although the restrictions are somewhat involved in spherical coordinates. To examine this constraint in more detail, the corresponding problems in model cylindrical coordinates (with the equat...

Masahiro Higuchi - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic and quasi-static behaviors of magneto-thermo-elastic stresses in a conducting hollow circular cylinder subjected to an Arbitrary Variation of magnetic field
    International Journal of Mechanical Sciences, 2008
    Co-Authors: Masahiro Higuchi, Ryuusuke Kawamura, Yoshinobu Tanigawa
    Abstract:

    In the present paper, dynamic and quasi-static behaviors of magneto-thermo-elastic stresses in a conducting hollow circular cylinder subjected to an Arbitrary Variation of magnetic field are investigated. It is assumed that a magnetic field defined by an Arbitrary function of time acts on the outer surface in the direction parallel to its surface. Fundamental equations of plane axisymmetrical electromagnetic, temperature and elastic fields are formulated. Then, solutions of magnetic field, eddy current, temperature change and both dynamic solutions and quasi-static ones of stresses and deformations are analytically derived in the forms including the Arbitrary function. The solutions of stresses are determined to be sums of thermal stress caused by eddy current loss and magnetic stress caused by Lorentz force. For the case that the Arbitrary function is given by the sine function, the dynamic and quasi-static behaviors of the stresses are examined by numerical calculations.

  • Dynamic and quasi-static behaviors of magneto-thermo-elastic stresses in a conducting infinite plate subjected to an Arbitrary Variation of magnetic field
    Acta Mechanica, 2007
    Co-Authors: Masahiro Higuchi, Ryuusuke Kawamura, Yoshinobu Tanigawa, H. Fujieda
    Abstract:

    In the present paper, dynamic and quasi-static behaviors of magneto-thermo-elastic stresses in a conducting infinite plate subjected to an Arbitrary Variation of the magnetic field are investigated. It is assumed that a magnetic field defined by an Arbitrary function of time acts on both side surfaces of the infinite plate in the direction parallel to its surfaces. Fundamental equations of one-dimensional electromagnetic, temperature and elastic fields are formulated. Then, solutions of magnetic field, eddy current, temperature change and both dynamic solutions and quasi-static ones of stresses and deformations in the infinite plate are derived analytically. The solutions of stresses are determined to be sums of thermal stress caused by eddy current loss and magnetic stress caused by Lorentz force. For the case that the Arbitrary function is given by the sine function, the dynamic and quasi-static behaviors of the stresses are examined by numerical calculations.

  • Dynamic and Quasi-Static Behaviors of Magneto-Thermo-Elastic Stresses in a Conducting Solid Circular Cylinder Subjected to an Arbitrary Variation of Magnetic Field
    Journal of Thermal Stresses, 2007
    Co-Authors: Masahiro Higuchi, Ryuusuke Kawamura, Yoshinobu Tanigawa
    Abstract:

    In the present article, dynamic and quasi-static behaviors of magneto-thermo-elastic stresses in a conducting solid circular cylinder subjected to an Arbitrary Variation of magnetic field are investigated. It is assumed that a magnetic field defined by an Arbitrary function of time acts on the surface in the direction parallel to its surface. Dynamic and quasi-static solutions of stresses are analytically derived. The solutions of stresses are determined to be sums of thermal stress caused by eddy current loss and magnetic stress caused by Lorentz force. For the case that the Arbitrary function is given by the sine function, the dynamic and quasi-static behaviors of the stresses are examined by numerical calculations.