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    Wyświetlanie 1-5 z 5
    Tytuł:
    Preliminary Study of Frequency-Variable Vibration Packing Fabrication for Atomized Metallic Particulate Fuel Using Surrogate Spherical Powder
    Autorzy:
    Kim, Ki-Hwan
    Ha, Seong-Jun
    Park, Sang-Gyu
    Kuk, Seoung-Woo
    Park, Jeong-Yong
    Powiązania:
    https://bibliotekanauki.pl/articles/2049120.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    atomized powder
    injection casting
    metallic particulate fuel
    alternative fabrication method
    vibration packing
    Opis:
    An alternative fabrication method for metallic fuel in Gen-IV reactor was introduced with vibration packing of nuclear fuel particles to facilitate remote fabrication in a hot cell and reduce the generation of long-lived radioactive wastes. Vibration packing experiments on metallic particulate fuel using a surrogate 316L stainless steel powder were done to investigate the packing density and the uniformity of the simulated fuel according to the filling method and the vibration condition. Metallic particulate fuel filled with a pre-mixed power over all particles had the highest packing fraction and the most uniform distribution among the filling methods. The vibration packing method showed that it could fabricate the metallic particulate fuel having uniform distribution of spherical fuel particles through the adjustment of the filling method of the metallic powder and the vibration condition of the metallic particulate fuel.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1043-1047
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Characterization of U-10wt.%Zr Fuel Slugs Containing Rare-Earth Elements Prepared by Modified Injection Casting
    Autorzy:
    Lee, Sang-Hun
    Kim, Ki-Hwan
    Kuk, Seoung-Woo
    Park, Jeong-Yong
    Choi, Ji-Hoon
    Powiązania:
    https://bibliotekanauki.pl/articles/355802.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    U-Zr
    rare-earth element
    microstructure
    injection casting
    sodium-cooled fast reactor
    SFR
    Opis:
    U-10wt.%Zr metallic fuel slugs containing rare-earth (RE: a rare-earth alloy comprising 53% Nd, 25% Ce, 16% Pr and 6% La) elements for a sodium-cooled fast reactor were fabricated by modified injection casting as an alternative method. The distribution, size and composition of the RE inclusions in the metallic fuel slugs were investigated according to the content of the RE inclusions. There were no observed casting defects, such as shrunk pipes, micro-shrinkage or hot tears formed during solidification, in the metallic fuel slugs fabricated by modified injection casting. Scanning electron micrographs and energy-dispersive X-ray spectroscopy (SEM-EDS) showed that the Zr and RE inclusions were uniformly distributed in the matrix and the composition of the RE inclusions was similar to that of a charged RE element. The content and the size of the RE inclusions increased slightly according to the charge content of the RE elements. RE inclusions in U-Zr alloys will have a positive effect on fuel performance due to their micro-size and high degree of distribution.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 953-957
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of U-10wt.%Zr-RE Fuel Slugs by Recycling of Metallic Fuel Scraps
    Autorzy:
    Kim, Ki-Hwan
    Mun, Seung-Uk
    Ha, Seong-Jun
    Kuk, Seoung-Woo
    Park, Jeong-Yong
    Powiązania:
    https://bibliotekanauki.pl/articles/354614.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fuel slug
    scrap recycling
    mechanical cleaning treatment
    fabrication yield rate
    radioactive wastes
    Opis:
    U-10wt.%Zr-5wt.%RE fuel slugs for a sodium-cooled fast reactor (SFR) were conventionally prepared by a modified injection casting method, which had the drawback of a low fabrication yield rate of approximately 60% because of the formation of many metallic fuel scraps, such as melt residue and unsuitable fuel slug butts. Moreover, the metallic fuel scraps were classified as a radioactive waste and stored in temporary storage without recycling. It is necessary to develop a recycling process technology for scrap wastes in order to reduce the radioactive wastes of the fuel scraps and improve the fabrication yield of the fuel slugs. In this study, the additive recycling process of the metallic fuel scraps was introduced to re-fabricate the U-10wt.%Zr-5wt.%RE fuel slugs. The U-10wt.%Zr-5wt.%RE fuel scraps were cleaned on the surface impurity layers with a mechanical treatment that used an electric brush under an Ar atmosphere. The U-10wt.%Zr-5wt.%RE fuel slugs were soundly re-fabricated and examined to evaluate the feasibility of the additive process compared with the metallic fuel slugs that used pure metals.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1035-1039
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nation Branding through Internationalization of Higher Education: A Case Study of African Students in South Korea
    Autorzy:
    Park, Jeong Kyung
    Kim, Yong Deog
    DeMatteo, Kaia
    Powiązania:
    https://bibliotekanauki.pl/articles/2004916.pdf
    Data publikacji:
    2016-09-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    African students
    globalization
    higher education
    internationalization
    nation branding
    South Korea
    Opis:
    This study focuses on the effect that internationalization of higher education has on the nation branding of South Korea. To better understand the role that international students in higher education play in nation branding, research is needed on the actual experiences of international students in the country. In this study, current and former African university students’ experiences living and studying in South Korea are investigated. This study, therefore, uses the nation branding framework within the context of South Korea and the role of higher education as an image enhancement strategy geared toward global public inclusion; its focus is on the experiences of African students. In order to obtain multiple perspectives on African student experiences, a survey was conducted using a questionnaire. The empirical evidence obtained in this study demonstrates that African students’ experiences in South Korea are relevant in their perceptions of the host country. The results suggest the positive impact that the South Korean government has on improving the country’s image through encouragement of internationalization of higher education, especially among African students who come to the country for their tertiary education.
    Źródło:
    The New Educational Review; 2016, 45; 52-63
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of Metal Gas Filter by Material Extrusion Additive Manufacturing Process
    Autorzy:
    Yi, Yu-Jeong
    Lee, Min-Jeong
    Yun, Su-Jin
    Park, Manho
    Kim, Ju-Yong
    Lee, Jungwoo
    Yun, Jung-Yeul
    Powiązania:
    https://bibliotekanauki.pl/articles/2174560.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas filter
    additive manufacturing
    stainless steel
    porosity
    powder size
    Opis:
    Recently, 3D printing processes have been used to manufacture metal powder filters with manufacturing complex-shape. In this study, metal powder filters of various shapes were manufactured using the metal extrusion additive manufacturing (MEAM) process, which is used to manufacture three-dimensional structures by extruding a filament consisting of a metal powder and a binder. Firstly, filaments were prepared by appropriately mixing SUS316 powder with sizes ranging from 7.5 µm to 50 µm and a binder. These filaments were extruded at temperatures of 100℃ to 160℃ depending on the type of filament being manufactured, to form three types of cylindrical filter. Specimens were sintered in a high vacuum atmosphere furnace at 850℃ to 1050℃ for 1 hour after debinding. The specimens were analyzed for permeability using a capillary flow porometer, porosity was determined by applying Archimedes’ law and microstructure was observed using SEM.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1517--1520
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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