American Journal of Astronomy and Astrophysics

Volume 8, Issue 2, June 2020

  • Stability of Digital Control System for Unmanned Aerial Vehicle with Numerical Analysis

    Thanda Win, Hteik Tin Cho Nyunt, Hla Myo Tun

    Issue: Volume 8, Issue 2, June 2020
    Pages: 15-18
    Received: 20 October 2019
    Accepted: 7 April 2020
    Published: 17 April 2020
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    Abstract: The paper presents the analysis on stability of digital control system for unmanned vehicle with numerical analysis. The objective of this study is mainly emphasized on the fulfillment of the advanced control techniques according to the fundamental concepts of digital control system approaches for unmanned aerial vehicle system design. The targeted... Show More
  • Natural Cause of Galaxy Rotation

    Conrad Ranzan

    Issue: Volume 8, Issue 2, June 2020
    Pages: 19-29
    Received: 14 March 2020
    Accepted: 28 April 2020
    Published: 15 May 2020
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    Abstract: Presented is a clear description of the mechanism by which galaxies acquire significant rotation. Beneath the apparent random motions and concentrations of galaxies lies the simplicity and regularity of a cosmic-scale cellular structure. It is explained how the dynamics that sustain this cellular structure is responsible for (1) the initial linear ... Show More
  • A Differential Rotation Law for Stars and Fluid Planets

    Joel Uriel Cisneros-Parra, Francisco Javier Martínez-Herrera, Daniel Montalvo-Castro

    Issue: Volume 8, Issue 2, June 2020
    Pages: 30-34
    Received: 31 March 2020
    Accepted: 3 May 2020
    Published: 15 May 2020
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    Abstract: We derive, supported on a generalization of Bernoulli’s equation, a law of rotation for any axial-symmetric, self-gravitating fluid mass. For a homogeneous mass, the law depends solely on the derivative of the potential with respect to the distance to the rotation axis, implying generally differential rotation, the Maclaurin spheroids representing ... Show More
  • Formation and Change of Jupiter's Magnetic Field

    Cuixiang Zhong

    Issue: Volume 8, Issue 2, June 2020
    Pages: 35-38
    Received: 8 May 2020
    Accepted: 25 May 2020
    Published: 4 June 2020
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    Abstract: The existing theory of planetary magnetic field holds that Jupiter has an internal magnetic field similar to the geomagnetic field, it is formed by the agitation of liquid metal hydrogen. But this hypothesis fails to explain many strange properties of Jupiter's magnetic field, especially that Jupiter's magnetic field is changing over time, which wa... Show More