articles by Hesham Tantawy
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Papers by Hesham Tantawy
SPE polymers, Mar 23, 2024
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Journal of Inorganic and Organometallic Polymers and Materials, May 4, 2021
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Deleted Journal, Mar 23, 2024
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Journal of Applied Physics, Nov 3, 2015
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Zeitschrift für anorganische und allgemeine Chemie, May 28, 2021
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Journal of Radioanalytical and Nuclear Chemistry, Jan 25, 2021
Wadi El Reddah, Egypt, is mostly enclosed by scattered exposure to the chronological sequence of ... more Wadi El Reddah, Egypt, is mostly enclosed by scattered exposure to the chronological sequence of a metavolcanic and metagabbro-diorite complex. There are radiological impacts due to internal and external exposure to the high natural background radiation caused by 226Ra, 232Th, and 40K in the Wadi El-Reddah stream sediments. 72 samples were collected and the activity concentration was measured using a NaI(Tl) gamma-spectroscopy system. The average activity concentration of 226Ra, 232Th and 40K was 215 ± 118 Bq kg−1, 131 ± 90 Bq kg−1 and 822 ± 125 Bq kg−1, respectively. Most of the studied samples had a higher activity concentration than the world average.
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Journal of physics, Jul 1, 2021
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IOP Conference Series: Materials Science and Engineering, 2021
Low emissivity coatings were synthesized by using fine flake Aluminium (Al) powder as a filler wi... more Low emissivity coatings were synthesized by using fine flake Aluminium (Al) powder as a filler within acrylic resin to from the desired composite coatings. In the current work, ball milling was applied to prepare Al with different shapes and sizes. The technical parameters of prepared Al powders with respect to the initial raw Al are characterized by scanning electron microscope (SEM), X-Ray diffraction (XRD), and Energy Dispersive X-Ray Analysis (EDX). Moreover, parameters that affect the emissivity of the coating was investigated; such as coating thickness, particle size, spin coating, ball milling time and the content of coated Al powder. The thermal signature is highly affected by the variation in Al content (5%, 20%, 25%, 35%, 40% and 60%) at different temperatures (50°C, 70°C, 90°C). The results indicate that the perfect percentage for the filler (Al) in the matrix within the range (35 wt. - 40 wt. %) and Al fine flake powder particle, which gives the lowest infrared emissivity of 0.385 μm and 0.412 μm for (3-5) μm, (8-12) μm, respectively.
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Journal of Molecular Structure, Sep 1, 2023
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Scientific Reports, Oct 12, 2022
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articles by Hesham Tantawy
Papers by Hesham Tantawy