American Journal of Physics and Applications

Archive

Volume 7, Issue 4, July 2019

  • Quantum Theory of Fields and Properties of Quantum Systems

    Fernand Tshizanga Mpinga

    Issue: Volume 7, Issue 4, July 2019
    Pages: 93-100
    Received: 27 April 2019
    Accepted: 3 June 2019
    Published: 4 July 2019
    DOI: 10.11648/j.ajpa.20190704.11
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    Abstract: Quantum theory of fields is the most general theory to date. It has an extremely wide field of application: - the physics of elementary particles and their interactions (summarized by the Standard Model); - the physics of the universe close to the Big Bang (primordial fluctuations from which the formation of the structure of the universe originates... Show More
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  • A Broadband Millimeter-Wave Waveguide Power Divider with High Isolation

    Hua Zhang, Deng Yun Shao, Yun Shao

    Issue: Volume 7, Issue 4, July 2019
    Pages: 101-108
    Received: 27 May 2019
    Accepted: 16 July 2019
    Published: 5 August 2019
    DOI: 10.11648/j.ajpa.20190704.12
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    Abstract: In this paper, an E-plane stepped-impedance transformer and Y-junction bifurcation are used to form a waveguide power divider with ceramic substrate loaded with thin film resistors. This structure is realized high isolation in V-band by inserting a ceramic substrate at the H-plane center of the Y-junction waveguide bifurcation, both sides of which ... Show More
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  • Study on the Influence of Radon Collector Parame

    Shangting Jiang, Jian Shan, Hui Yang, Jinglin Li, Songsong Li, Tao Guo

    Issue: Volume 7, Issue 4, July 2019
    Pages: 109-117
    Received: 22 July 2019
    Accepted: 14 August 2019
    Published: 2 September 2019
    DOI: 10.11648/j.ajpa.20190704.13
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    Abstract: Accurate measurement of radon exhalation rate of building materials plays an important role in controlling indoor radon concentration. In order to achieve rapid and accurate measurement of radon exhalation, the influence of the volume, base area and pumping flow rate of radon collector on radon exhalation rate was studied to optimize the measuremen... Show More
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