American Journal of Physics and Applications

Volume 9, Issue 2, March 2021

  • Microscopic Study of Two Band Superconductivity in Magnesium Diboride Superconductor (MgB2)

    Basanta Kumar Sahoo, Biswa Ranjan Mishra, Subhalaxmi Das, Santosh Kumar Barik, Padmaja Patnaik, Ranjan Kumar Bhuyan, Bibekananda Panda

    Issue: Volume 9, Issue 2, March 2021
    Pages: 29-33
    Received: Mar. 15, 2021
    Accepted: Apr. 07, 2021
    Published: Apr. 26, 2021
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    Abstract: We formulate a Model Hamiltonian of two band superconductivity for Magnesium Diboride superconductors (MgB2). It is a conventional BCS type metallic superconductor which has the highest critical temperature Tc=39K. It is assumed that the superconductivity in MgB2 arises due to metallic nature of the 2D sheets. From band structure calculations, it i... Show More
  • The Wheel – Vehicle Considered as a Material Point: An Approximate Theory of Automobiles

    Thanassis Dialynas

    Issue: Volume 9, Issue 2, March 2021
    Pages: 34-41
    Received: Feb. 02, 2021
    Accepted: Feb. 24, 2021
    Published: Apr. 26, 2021
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    Abstract: The objective of the article is the mathematical description of the car motion in the most possible general form using Newton’s second law and the forces that act on it when they are known. In the first section, the forces that act on the vehicle are described and the normal (usual) conditions of driving are considered. Secondly the dynamical equat... Show More
  • Estimation of Concentration of Naturally Occurring Radioactivity and Radiation Hazards, in Iron Ore Deposit Soil from Wag-Himra Zone, Ethiopia

    Tadesse Gebeyehu, Baye Zinabe, Teshager Akalie

    Issue: Volume 9, Issue 2, March 2021
    Pages: 42-47
    Received: Apr. 03, 2021
    Accepted: May 06, 2021
    Published: May 21, 2021
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    Abstract: The current study looked at the concentration of naturally occurring radioactivity and radiation hazards in iron ore deposited in soil. The aim of this study was to identify the dose of radiation which is emitted from rocks, soil and some building materials, the radiation dose and the effect in the area. In this work, analyses of the sample soils w... Show More
  • Evaluation of Natural Radioactive Elements and Hazardous Indexes Using High Pure Germanium Gamma Ray Spectroscopy in Sekota, Waghimra, Zone, Ethiopia

    Baye Zinabe Kebede, Tadesse Gebeyehu

    Issue: Volume 9, Issue 2, March 2021
    Pages: 48-52
    Received: May 08, 2021
    Accepted: Jun. 30, 2021
    Published: Jul. 09, 2021
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    Abstract: This research paper desired to illustrate the presence of naturally occurring radioactive minerals concentration and the way how naturally occurring radioactive minerals were identified in Wag-himra iron ore deposit soil site. The deposit area covers five Kebelles of the border of Sekota, Ziquale and Abergelle districts. We were used high pure germ... Show More