Yazar "Al-Khafaji, Zainab S." seçeneğine göre listele

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    Evaluation the influence of steel-fiber on the concrete characteristics
    (International University of Sarajevo, 2022) Ali, Asma Mahdi; Falah, Mayadah W.; Hafedh, Alaa Adnan; Al-Khafaji, Zainab S.; Radhi, Sabaa
    The impact of steel fibers on the engineering characteristics of concretes were explored experimentally in this work. Steel fibers of 0.5, 0.7, and 0.9 percent by volume fraction were applied to concretes mixture with water/cements (W/C) proportions of 0.43 to accomplish this. There has been a total of 24 cubic specimens produced for compressive strengths testing, 24 cylindrical specimens for splitting tension strengths testing, and 12 cubic specimens for toughened unit weight testing. The experimental findings reveal that applying 0.5 percent to 0.9 percent of fibers made of steel to concrete boosts both compressive and tension strengths concurrently when compared to ordinary concretes; however, there is no discernible gain in hardened unit weight with increased fiber amounts.
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    Measuring radiation in space with bubble detectors and the effect of radiation on health system of human body
    (American Institute of Physics Inc., 2023) Al-Khafaji, Zainab S.; Radhi, Sabaa S.; Mahdi, Marwah M.; Radhi, Nabaa Sattar; Mareai, Basim M.
    A bubble detector resembles a testing tube or a human fingertip in size and form. It has a material with small liquid droplets in it. When neutrons collide with the droplets, visible bubbles of trapped gas appear almost instantly. The number of bubbles in the surrounding neutron radiation may be measured optically or with a reader, and the number of bubbles reflects the degree of neutron radiation. The gas bubbles may be compressed again and used again. A bubble detector becomes a radiation sensor utilized to assess neutron levels. Neutrons account for 30 percent of the radiations that astronauts encounter in orbit. When protons collide with a spacecraft's shielding, neutrons are produced. To better monitor specific astronauts' neutron exposures throughout space missions, the Canadian Space Agency's Operation Space Medicine (OSM) Group is sponsoring the development of a personal detector device for space usage depending on Canadian bubble dosimeter technology. The current study focuses on mechanisms utilized for detecting radiation, Neutron detectors, and kinds of Neutron detectors, in addition to the effect of radiation on the health system.
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    Study the effect of adding zirconia particles to nickel-phosphorus electroless coatings as product innovation on stainless steel substrate
    (De Gruyter, 2022) Abed, Khalid Mutashar; Radhi, Nabaa S.; Jasim, Ahlam Hamid; Al-Khafaji, Zainab S.; Radhi, Sabaa; Hussien, Safa A.
    Scholars have spent much time studying metal deposition procedures involving the deposition of elec-troless nickel, alloy, and composite coatings on various surfaces; the most current uses were feasible advantages of the coatings' many good properties for achieving the final product innovation. Lately, these coatings have demonstrated intriguing wear and corrosion resistance features, resulting in several innovative macro-level developments. The notion of composite coating by co-deposition coating has been presented in this article. The characteristics of Ni-Pb alloy coatings were examined by inserting particles into the electroless deposited solution. The stainless steel (SS) specimens have been electro-less coated with Ni-Pb and ZrO2 nanoparticles (size = 30-70 nm) at 0, 10, and 20 g/L amounts. The materials have been examined using scanning electron microscope and atomic force microscope, followed by wear-resistant and microhardness testing. According to the investigation findings, including inert particles improved the hardness magnitude and wearing resistance considerably. The base metal exhibited the highest wear rate at 10 N, while the-wear rate decreased in the Ni-Pb-ZrO2-coated SS316L by 34%. The Vickers hardness magnitudes of the Ni-Pb-ZrO2-coated samples at different ZrO2 contents (0,10, and 20 g/L) were 19, 50, and 81%, respectively.
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    Sustainable heating system by infrared radiators
    (Research and Development Academy, 2022) Radhi, Sabaa S.; Al-Khafaji, Zainab S.; Falah, Mayadah W.
    Maintaining the optimum temperature in the living quarters is the key to a comfortable stay. Due to the lack of a central heating system or in the event of its insufficiency, they resort to the installation of additional heat sources. There is a wide range of devices on the market with different operating principles, hence the difficulty of which is better - a convector or infrared heater. A comparative analysis of devices will help you make the right choice. Asking the question of which is better a convection heater or an infrared heater, one must decide on its role in heating the house. It is better to use them as additional equipment with an existing heating system. One of the effective sources of additional heating are infrared radiators. Its principle of operation is based on infrared radiation, which provides a quick and qualitative increase in temperature in any part of your apartment. Today, more and more people prefer infrared radiators. From the usual electric convector, they differ in that they heat not the air in the room, but hard surfaces (floors, walls) and objects, and these, in turn, leak heat into the surrounding space. So, the entire room is heated up unnoticeably.