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  • Articles  (774)
  • Springer  (774)
  • American Chemical Society (ACS)
  • American Geophysical Union
  • 2015-2019  (774)
  • 2005-2009
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  • 1980-1984
  • 2017  (774)
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  • European Physical Journal Plus  (219)
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  • Physics  (774)
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  • Articles  (774)
Source
Publisher
  • Springer  (774)
  • American Chemical Society (ACS)
  • American Geophysical Union
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  • 2015-2019  (774)
  • 2005-2009
  • 1990-1994
  • 1980-1984
Year
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  • Physics  (774)
  • Nature of Science, Research, Systems of Higher Education, Museum Science
  • 1
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    Viscous dissipation in 2D fluid dynamics as a symplectic process and its metriplectic representation (2017)
    Springer
    Details
    Publication Date: 2017-03-21
    Description: . Dissipation can be represented in Hamiltonian mechanics in an extended phase space as a symplectic process. The method uses an auxiliary variable which represents the excitation of unresolved dynamics and a Hamiltonian for the interaction between the resolved dynamics and the auxiliary variable. This method is applied to viscous dissipation (including hyper-viscosity) in a two-dimensional fluid, for which the dynamics is non-canonical. We derive a metriplectic representation and suggest a measure for the entropy of the system.
    Electronic ISSN: 2190-5444
    Topics: Physics
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  • 2
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    Is there a resting frame in the universe? A proposed experimental test based on a precise measurement of particle mass (2017)
    Springer
    Details
    Publication Date: 2017-03-21
    Description: . According to the Special Theory of Relativity, there should be no resting frame in our universe. Such an assumption, however, could be in conflict with the Standard Model of cosmology today, which regards the vacuum not as an empty space. Thus, there is a strong need to experimentally test whether there is a resting frame in our universe or not. We propose that this can be done by precisely measuring the masses of two charged particles moving in opposite directions. If all inertial frames are equivalent, there should be no detectable mass difference between these two particles. If there is a resting frame in the universe, one will observe a mass difference that is dependent on the orientation of the laboratory frame. The detailed experimental setup is discussed in this paper.
    Electronic ISSN: 2190-5444
    Topics: Physics
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  • 3
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    Scattering of position-dependent mass Schrödinger equation with delta potential (2017)
    Springer
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    Publication Date: 2017-03-21
    Description: . The scattering of the position-dependent mass Schrödinger equation due to both single Dirac delta and double Dirac delta potentials has been investigated. We have obtained the reflection as well as transmission coefficients and current density for both potentials. Moreover, we have studied the Ramsauer-Townsend effect with the position-dependent mass in quantum mechanics.
    Electronic ISSN: 2190-5444
    Topics: Physics
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  • 4
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    Dynamics of solitons to the ill-posed Boussinesq equation (2017)
    Springer
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    Publication Date: 2017-03-21
    Description: . In this paper, we analyze the dynamic behavior of the ill-posed Boussinesq equation (IPBE) that arises in nonlinear lattices and also in shallow water waves. Some solitary wave solutions are obtained by using the solitary wave ansatz method and the Bernoulli sub-Ode. By applying the technique of nonlinear self-adjoint, a quasi self-adjoint substitution for the IPBE is constructed. The classical symmetries of the equation are constructed. Then, we used along with the obtained nonlinear self-adjoint substitution to construct a set of new conservation laws (Cls).
    Electronic ISSN: 2190-5444
    Topics: Physics
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  • 5
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    Quantum tunneling from the charged non-rotating BTZ black hole with GUP (2017)
    Springer
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    Publication Date: 2017-03-21
    Description: . In the present paper, the quantum corrections to the temperature, entropy and specific heat capacity of the charged non-rotating BTZ black hole are studied by the generalized uncertainty principle in the tunneling formalism. It is shown that quantum corrected entropy would be of the form of predicted entropy in quantum gravity theories like string theory and loop quantum gravity.
    Electronic ISSN: 2190-5444
    Topics: Physics
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  • 6
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    A semiclassical extended electron model (2017)
    Springer
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    Publication Date: 2017-03-21
    Description: . The self-energy of a given charge distribution is the energy required to assemble the distribution by bringing in the constituent charges from infinity. Particularly, for a pointlike distribution ( e.g. , a classical electron) the self-energy is infinity. Thus a modification of the Coulomb potential is required in order to have a finite value for this energy. Here we present a model for a charged particle consisting of a potential well together with a combination of Coulomb and Yukawa-like potentials. This leads us to finding an approximate value attributed to its self-energy. We subsequently discuss the non-relativistic electron-electron scattering problem.
    Electronic ISSN: 2190-5444
    Topics: Physics
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  • 7
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    Construction of the energy matrix for complex atoms (2017)
    Springer
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    Publication Date: 2017-03-21
    Description: . We report the fine structure analysis of the even configurations system of atomic terbium in the complete set of \( 4{\rm f}^{N}\) -core states. For the purpose of the huge matrix diagonalization, we propose the methods utilizing the personal computer clusters and, alternatively, the Microsoft Azure cloud computing. The implementation of these approaches is presented.
    Electronic ISSN: 2190-5444
    Topics: Physics
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  • 8
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    Application of the Legendre wavelets method to the parallel plate flow of a third grade fluid and forced convection in a porous duct (2017)
    Springer
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    Publication Date: 2017-03-21
    Description: . A method based on Legendre wavelets is presented in this paper to discuss the flow of a third grade fluid between parallel plates and the forced convection in a porous duct. The flow problems are modeled in terms of integral equations which are then solved by the Legendre wavelets method. The comparison between present results and the existing solutions shows that the Legendre wavelets method is a powerful tool for solving nonlinear boundary value problems. We hope this method can be used for solving many interesting problems arising in non-Newtonian fluids.
    Electronic ISSN: 2190-5444
    Topics: Physics
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  • 9
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    Numerical investigation of the heat transfer of a ferrofluid inside a tube in the presence of a non-uniform magnetic field (2017)
    Springer
    Details
    Publication Date: 2017-02-10
    Description: . In this article, a three-dimensional numerical investigation is performed to study the effect of a magnetic field on a ferrofluid inside a tube. This study comprehensively analyzes the influence of a non-uniform magnetic field in the heat transfer of a tube while a ferrofluid (water with 0.86 vol% nanoparticles (Fe 3 O 4 ) is let flow. The SIMPLEC algorithm is used for obtaining the flow and heat transfer inside the tube. The influence of various parameters, such as concentration of nanoparticles, intensity of the magnetic field, wire distance and Reynolds number, on the heat transfer is investigated. According to the obtained results, the presence of a non-uniform magnetic field significantly increases the Nusselt number (more than 300%) inside the tube. Also, the magnetic field induced by the parallel wire affects the average velocity of the ferrofluid and forms two strong eddies in the tube. Our findings show that the diffusion also raises as the concentration of the nanoparticle is increased.
    Electronic ISSN: 2190-5444
    Topics: Physics
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  • 10
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    Geometric properties of the Kantowski-Sachs and Bianchi-type Killing algebra in relation to a Klein-Gordon equation (2017)
    Springer
    Details
    Publication Date: 2017-02-15
    Description: . We study the geometric properties of generators for the Klein-Gordon equation in Kantowski-Sachs and certain Bianchi-type spaces. Several versions of the Klein-Gordon equation are derived from its dependence on a potential function. The criteria for different versions of the (1+3) Klein-Gordon equation originates from analyzing three sources, viz. through generators that are identically the Killing algebra, or with the Killing vector fields that are recast into linear combinations and thirdly, real sub-algebras within the conformal algebra. In turn, these equations admit a catalogue of infinitesimal symmetries that are equivalent to the corresponding Killing vector fields in Kantowski-Sachs, Bianchi type III , IX , VIII , VI 0 and VII 0 space-times, with the exception of a linear vector \(W=u\partial_{u}\) in every case. The sheer number of results are displayed in appropriate tables. Subsequently, in application, we derive some Noetherian conservation laws and identify some exact solutions by quadratures.
    Electronic ISSN: 2190-5444
    Topics: Physics
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