American Journal of Modern Physics

Volume 10, Issue 1, January 2021

  • The Evolution of Star Formation Rate Density of Galaxies

    Joachim Wirsich

    Issue: Volume 10, Issue 1, January 2021
    Pages: 1-6
    Received: Oct. 30, 2020
    Accepted: Jan. 05, 2021
    Published: Feb. 20, 2021
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    Abstract: We present a semi-analytical calculation of the global star formation density (SFD) by using the well constrained cold dark matter (CDM) halo mass function. Both, halo masses MH(z) and stellar masses M*(z) are taken from observations of Lyα emitter (LAEs) and/or Lyman break galaxies (LBGs). Most of them, spectroscopically selected, are characterize... Show More
  • A Sectional Control Method to Decrease the Accumulated Survey Error of Tunnel Installation Control Network

    Ying-gang Guo, Zong-chun Li

    Issue: Volume 10, Issue 1, January 2021
    Pages: 7-15
    Received: Mar. 01, 2021
    Accepted: Mar. 12, 2021
    Published: Mar. 17, 2021
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    Abstract: The location reference for the precision installation of components of particle accelerator is provided by tunnel installation control network. The long and narrow control network has big accumulated error with increasing distance. In order to decrease the accumulated survey error of tunnel installation control network of particle accelerator, a se... Show More
  • Dynamics of Dusty Pair-Ion-Electron Plasma Modeled by the Cylindrical Kadomtsev-Petviashvili Equations

    Bertrand Noel Tagne Wafo, François Marie Moukam Kakmeni

    Issue: Volume 10, Issue 1, January 2021
    Pages: 16-25
    Received: Nov. 26, 2020
    Accepted: Jan. 16, 2021
    Published: Mar. 17, 2021
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    Abstract: The nonlinear propagation and stability of dust ion-waves in plasma is analytically and numerically investigated. By using the the standard reductive perturbation method, the electrostatic potential in dusty pair-ion-electron plasma is modelled by cylindrical Kadomtsev-Petviashvili (CKP) equation. The soliton solutions are obtained using the direct... Show More