American Journal of Physics and Applications

Volume 4, Issue 2, March 2016

  • Interacting Polyelectrolyte Brushes Grafted in Two Bilayers: Molecular Dynamics Simulations

    Nourdine Hadrioui, Khalid Elhasnaoui, Abdelwahad Maarouf, Tarik ELhafi, Hamid Ridouane

    Issue: Volume 4, Issue 2, March 2016
    Pages: 20-26
    Received: Feb. 02, 2016
    Accepted: Feb. 18, 2016
    Published: Mar. 06, 2016
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    Abstract: Using molecular dynamics simulations, we study interacting polyelectrolyte brushes that are grafted to two parallel surfaces (quasi-Planar Membrane). The interactions between brushes are important, for instance, in stabilization of dispersions against flocculation. We simulate the relative shear motion of both neutral and polyelectrolyte end-grafte... Show More
  • Recent Developments in the X-ray Reflectivity Analysis

    Yoshikazu Fujii

    Issue: Volume 4, Issue 2, March 2016
    Pages: 27-49
    Received: Feb. 08, 2016
    Accepted: Feb. 16, 2016
    Published: Mar. 17, 2016
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    Abstract: X-ray reflectivity (XRR) is a powerfull tool for investigations on surface and interface structures of multilayered thin film materials. In the conventional XRR analysis, the X-ray reflectivity has been calculated based on the Parratt formalism, accounting for the effect of roughness by the theory of Nevot-Croce conventionally. However, the calcula... Show More
  • Generating Theorems for Charged Anisotropy in General Relativity

    Napasorn Jongjittanon, Petarpa Boonserm, Tritos Ngampitipan

    Issue: Volume 4, Issue 2, March 2016
    Pages: 50-56
    Received: Mar. 24, 2016
    Accepted:
    Published: Mar. 25, 2016
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    Abstract: For describing the interior of a spherical object in the general relativistic frame, some objects can be considered using the concept of perfect fluid spheres for simplicity. The absence of heat conduction and shear stress, and the presence of isotropic pressure are the characteristics of perfect fluid spheres. Previous works in this field constitu... Show More
  • The Modified Tolman-Oppenheimer-Volkov (TOV) Equation and the Effect of Charge on Pressure in Charge Anisotropy

    Petarpa Boonserm, Napasorn Jongjittanon, Tritos Ngampitipan

    Issue: Volume 4, Issue 2, March 2016
    Pages: 57-63
    Received: Mar. 24, 2016
    Accepted:
    Published: Mar. 25, 2016
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    Abstract: The Tolman-Oppenheimer-Volkov (TOV) equation describes the interior properties of spherical static perfect fluid object as a relationship between two physical observables - pressure and density. For a fluid sphere object, which contains electric charge, magnetic field, and scalar field, the pressure becomes anisotropic. In the previous article [Phy... Show More
  • Bounding the Greybody Factor, Temperature and Entropy of Black Holes in dRGT Massive Gravity

    Tritos Ngampitipan, Petarpa Boonserm, Pitayuth Wongjun

    Issue: Volume 4, Issue 2, March 2016
    Pages: 64-70
    Received: Apr. 08, 2016
    Accepted:
    Published: Apr. 09, 2016
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    Abstract: A black hole greybody factor is the quantum quantity of a black hole. It is the fraction of Hawking radiation that can reach spatial infinity. The greybody factor may contain the necessary information to support the theory of quantum gravity. An understanding of the greybody factor helps us gain insight, not only into the nature of the black hole i... Show More