American Journal of Physics and Applications

Volume 13, Issue 2, April 2025

  • Research Article

    Experimental Study to Measure Conductive Heat Transfer Properties in New Materials with Environmental Waste Aggregates

    Andrés Emanuel Díaz*, Alejandro Luís Hernandez

    Issue: Volume 13, Issue 2, April 2025
    Pages: 17-27
    Received: 7 February 2025
    Accepted: 19 February 2025
    Published: 18 March 2025
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    Abstract: This study presents the design, development, and operational evaluation of the HD25 Hot Box, a guarded hot plate apparatus designed to measure the thermal conductivity of concrete specimens under steady-state conditions. The HD25 Hot Box was developed to assess the heat transfer properties of construction materials, particularly those incorporating... Show More
  • Research Article

    A Physics Model for Origin of Life

    Paul Howard Frampton*

    Issue: Volume 13, Issue 2, April 2025
    Pages: 28-30
    Received: 17 February 2025
    Accepted: 5 March 2025
    Published: 10 April 2025
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    Abstract: In this article, we attempt to convince the reader that the origin of life was such an exceptionally unlikely event that it probably has never occurred elsewhere. This involves an explicit calculation using the laws of physics which, while speculative, may encapsulate the essential science without knowledge of biological details. Making only physic... Show More
  • Research Article

    Comparison of Public Indoor Internal Exposure from Radon-222 Inhalation in the Different Dwellings of 09 Regions of Madagascar

    Tiana Harimalala Randriamora*, Hary Andrianarimanana Razafindramiandra, Mbolatiana Anjarasoa Luc Ralaivelo, Joseph Lucien Radaorolala Zafimanjato, Tahiry Razakarimanana, Veroniaina Raharimboangy, José Elysé Rajoeliarivony

    Issue: Volume 13, Issue 2, April 2025
    Pages: 31-37
    Received: 12 March 2025
    Accepted: 26 March 2025
    Published: 17 April 2025
    DOI: 10.11648/j.ajpa.20251302.13
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    Abstract: Radon is the radioactive gas naturally present in the environment produced by natural radioactive decay of uranium-238. It is uncolored and inodorous and present in outdoor air as well as in dwelling spaces. In nine (09) regions of Madagascar, radon study was carried out for indoor radon concentration measurement in 62 dwellings spread. The aim of ... Show More