American Journal of Astronomy and Astrophysics

Archive

Volume 7, Issue 4, December 2019

  • Robust Performance Analysis on Dynamic Control of Unmanned Aerial Vehicle System Using Bode Plot

    Hteik Tin Cho Nyunt, Thanda Win, Hla Myo Tun

    Issue: Volume 7, Issue 4, December 2019
    Pages: 48-53
    Received: 19 October 2019
    Accepted: 14 November 2019
    Published: 25 November 2019
    DOI: 10.11648/j.ajaa.20190704.11
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    Abstract: The paper focuses on the robust performance analysis on dynamic control of unmanned aerial vehicle system with numerical computation. The objectives of this work are to find the appropriate solution for robust stability problems for dynamic control of unmanned aerial vehicle (UAV) system which is critical challenge in the space technology. The back... Show More
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  • Advanced Panspermia of Origin of Life and Evolution

    Venkata Subba Rao Yeragudipati

    Issue: Volume 7, Issue 4, December 2019
    Pages: 54-66
    Received: 2 November 2019
    Accepted: 21 November 2019
    Published: 26 November 2019
    DOI: 10.11648/j.ajaa.20190704.12
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    Abstract: In this study, a theory on Advanced Panspermia of Origin of Life and Evolution is proposed by establishing (i) striking planetary similarities observed for parents and their children of their respective birth times similar to matching bands in DNA Fingerprinting images of them establishing heredity; (ii) the number of DNA entries required to differ... Show More
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  • Variability of VTEC Gradient and TEC Rate Index Over Kisumu, Kenya During Selected Quiet and Storm Days of 2013 and 2014

    Uluma Edward, Ndinya Boniface, Omondi George

    Issue: Volume 7, Issue 4, December 2019
    Pages: 67-72
    Received: 30 October 2019
    Accepted: 26 November 2019
    Published: 4 December 2019
    DOI: 10.11648/j.ajaa.20190704.13
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    Abstract: Vertical Total electron content (VTEC) gradient or rate of change of TEC (ROT) and total electron content (TEC) rate index or rate of change of TEC index (ROTI) can directly be estimated from receiver independent exchange (RINEX) data and can be used to estimate presence and intensity of ionospheric irregularities. In this paper we present results ... Show More
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  • An Alternative Model of Rotation Curve that Explains Anomalous Orbital Velocity, Mass Discrepancy and Structure of Some Galaxies

    Paul Cadelina Rivera

    Issue: Volume 7, Issue 4, December 2019
    Pages: 73-79
    Received: 13 November 2019
    Accepted: 7 December 2019
    Published: 19 December 2019
    DOI: 10.11648/j.ajaa.20190704.14
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    Abstract: A new model of galaxy rotation based on the cyclostrophic model of vortices found in nature is developed. The model is tested using the SPARC dataset of 175 galaxies and a smaller dataset comprising of 60 galaxies. Analysis of the datasets showed that galactic rotation can be adequately described using the observed surface brightness of galaxies an... Show More
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