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    Wyświetlanie 1-38 z 38
    Tytuł:
    Women’s Career Development Towards School Superintendency: An Investigation into the Effect of Tacit Learning
    Autorzy:
    Kim, Yong-Lyun
    Powiązania:
    https://bibliotekanauki.pl/articles/26469813.pdf
    Data publikacji:
    2013-03-31
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    school superintendency
    women administrators
    career development
    tacit learning
    Opis:
    Career development can be discussed in two primary ways: 1) as a type of formal education and job preparation that a person receives; and 2) as a type of informal learning-related career experiences that a person encounters. This study investigates the effect of learning preparedness on female school administrators’ career development. For the data analysis, this study uses the Structural Equation Modeling statistics. The findings from the analysis support the view that tacit learning from both direct and indirect job experiences has a greater effect on women’s career development than formal learning. The effect of these factors, however, varies according to women’s aspirations for superintendency.
    Źródło:
    The New Educational Review; 2013, 31; 241-251
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On some radius results for normalized analytic functions
    Autorzy:
    Kim, Yong
    Kwon, Ern
    Powiązania:
    https://bibliotekanauki.pl/articles/1294513.pdf
    Data publikacji:
    1998
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Tematy:
    Hausdorff-Young theorem
    univalent function
    Hardy space
    Dirichlet space
    Opis:
    We investigate some radius results for various geometric properties concerning some subclasses of the class of univalent functions.
    Źródło:
    Annales Polonici Mathematici; 1998, 68, 1; 51-60
    0066-2216
    Pojawia się w:
    Annales Polonici Mathematici
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Confucian Thought Affecting Education in South-East Asian Countries vs. Socratic Education Philosophy in Western Countries
    Poglądy Konfucjusza oddziałujące na edukację w krajach południowo-wschodniej Azji a filozofia edukacji Sokratesa w krajach zachodnich
    Autorzy:
    Juszczyk, Stanisław
    Kim, Yong Deog
    Powiązania:
    https://bibliotekanauki.pl/articles/1943100.pdf
    Data publikacji:
    2017-12-31
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    Socrates
    Confucius
    culture
    education
    learning
    Western countries
    Asian countries
    Sokrates
    Konfucjusz
    kultura
    edukacja
    uczenie się
    kraje zachodnie
    kraje azjatyckie
    Opis:
    Socrates and Confucius constitute roots of western and eastern civilization respectively and represent very different cultural values and educational traditions. Both of the philosophers lived around 4 – 5th century B.C.E., but there were huge differences in the social and cultural environments in which they lived. Different cultural and social factors in ancient Greece and China led to differences in Socratic and Confucian approaches to learning. Their educational philosophies have been discussed on the base of the aim of education, the content of education, the teaching process, and the nature of the contemporary education. The method used in the described study is hermeneutics, or interpretation of the literary (here scientific) texts, thus the study is cross-cultural in nature and concerns the features of the contemporary education in both cultures.
    Sokrates i Konfucjusz stanowią o fundamentach odpowiednio zachodniej i wschodniej cywilizacji i reprezentują bardzo różne wartości kulturowe oraz tradycje edukacyjne. Obaj filozofowie żyli około IV–V wieku przed naszą erą, lecz w bardzo różnych środowiskach społecznych i kulturowych. Różne czynniki kulturowe i społeczne w starożytnej Grecji i Chinach doprowadziły do różnych poglądów Sokratesa i Konfucjusza na uczenie się. Ich filozofie edukacji zostały poddane dyskusji na bazie celów edukacji, zawartości merytorycznej, procesu nauczania i natury współczesnej edukacji. W opisanych badaniach użyto metodę hermeneutyczną, zwaną inaczej interpretacją tekstów literackich (tutaj naukowych), z tego powodu badania mają charakter interdyscyplinarny i dotyczą cech współczesnej edukacji w obu kulturach.
    Źródło:
    Athenaeum. Polskie Studia Politologiczne; 2017, 56; 97-110
    1505-2192
    Pojawia się w:
    Athenaeum. Polskie Studia Politologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Who I am asking about: What the sentence endings imply about the unexpressed subjects in wh-questions
    Autorzy:
    Izutsu, Katsunobu
    Kim, Yong-Taek
    Powiązania:
    https://bibliotekanauki.pl/articles/1036575.pdf
    Data publikacji:
    2019-12-11
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Opis:
    This study demonstrates that the sentence endings of Korean and Japanese wh-questions can be analyzed as serving to evoke and, in a weaker sense, to mark an unexpressed verb subject. This study further contends that the endings are not complex forms with successive morphemes each contributing to the whole meaning but rather simplex forms each of which has its own meaning and function. This study argues that pragmatic groupings of event participants help the sentence endings to mark subjects in the Korean and Japanese languages as well as other languages of the world.
    Źródło:
    Investigationes Linguisticae; 2018, 41; 43-56
    1426-188X
    1733-1757
    Pojawia się w:
    Investigationes Linguisticae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Use of Mobile Technologies to Promote Scientific Discovery Learning in Elementary School
    Autorzy:
    Lee, June
    Koo, Yangmi
    Kim, Yong-Lyun
    Powiązania:
    https://bibliotekanauki.pl/articles/26184010.pdf
    Data publikacji:
    2013-06-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    mobile technology
    discovery learning
    Smart Science
    Opis:
    The purpose of the study was to identify educational effects of a new learning method that integrates mobile-technology-based science learning with activity oriented discovery learning. The major finding of the study was that the mobile technology-based Science program enabled students to learn scientific knowledge through associated activities and creatively apply their knowledge to complete the mission of the learning. Also, the study found that the use of tablet PCs and SNS for scientific inquiry activities facilitated students to learn in fun ways, to collaborate with other students, and to share what they have learned with each other.
    Źródło:
    The New Educational Review; 2013, 32; 264-274
    1732-6729
    Pojawia się w:
    The New Educational Review
    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:
    Evaluation of and Prospects for Students’ Academic Performance in Polish History Education
    Autorzy:
    Kim, Yong-Deog
    Lee, Jong-Oh
    Kim, Jong-Suck
    Powiązania:
    https://bibliotekanauki.pl/articles/48527145.pdf
    Data publikacji:
    2012-06-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    Polska
    Korea
    Polish history
    Korean students
    Department of Polish
    Opis:
    For this study, an evaluation tool focusing on the Polish history was developed to measure the academic performance of college students who major in the Polish language in Korea. The purpose of this study was to investigate the effects of the tool on students’ academic performance after applying it in a classroom setting. The tool consisted of three types of questions, which were administered before and after the application of the tool to 108 students taking a Polish history course. The results of the study serve as a foundation for revitalizing research on Poland and Polish language education, as well as for improving students’ academic performance.
    Źródło:
    The New Educational Review; 2012, 28; 61-72
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Fe Content on the Mechanical Properties and Thermal Conductivity of the Al-RE Alloys
    Autorzy:
    Yoo, Hyo-Sang
    Kim, Yong-Ho
    Son, Hyeon-Taek
    Powiązania:
    https://bibliotekanauki.pl/articles/356397.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum
    extrusion
    rare earth
    thermal conductivity
    mechanical property
    Opis:
    In this study, we investigated the effect of Fe addition (0, 0.25, 0.50 and 0.75 wt.%) on the microstructure, mechanical properties and electrical conductivity of as-cast and as-extruded Al-RE alloys. As the Fe element increased by 0 and 0.75wt.%, the phase fraction increased to 5.05, 5.76, 7.14 and 7.38 %. The increased intermetallic compound increased the driving force for recrystallization and grain refinement. The electrical conductivity of Al-1.0 wt.%RE alloy with Fe addition decreased to 60.29, 60.15, 59.58 and 59.13 % IACS. With an increase in the Fe content from 0 to 0.75 wt.% the ultimate tensile strength (UTS) of the alloy increased from 74.3 to 77.5 MPa. As the mechanical properties increase compared to the reduction of the electrical conductivity due to Fe element addition, it is considered to be suitable for fields requiring high electrical conductivity and strength.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1029-1033
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Flux on the Recovery Behavior of Valuable Metals during the Melting Process of Aluminum Can Scrap
    Autorzy:
    Han, Chulwoong
    Kim, Yong Hwan
    Kim, Dae-Geun
    Lee, Man Seung
    Powiązania:
    https://bibliotekanauki.pl/articles/2048886.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum
    can scrap
    flux
    gas bubbling filtration
    GBF
    recycling
    Opis:
    This study investigated the effect of flux type and amounts on recovery behavior of aluminum alloy during the melting process of Al can scrap. The heat treatment was conducted to remove the coating layer on the surface of can scrap at 500°C for 30 min. The molten metal treatment of the scrap was performed at 750°C in a high-frequency induction furnace with different flux types and amounts. It was observed that the optimum condition for recovery of Al alloy was to add about 3 wt.% flux with a salt and MgCl2 mixing ratio of 70:30 during melting process. The mechanical properties of recovered Al alloy were about 254.8 mPa, which is similar to that of the virgin Al5083 alloy.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1023-1027
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Densification and Magnetic Properties of Fe Powder Compacts According to Heat-Treatment Conditions
    Autorzy:
    Yoo, Hyo-Sang
    Kim, Yong-Ho
    Kim, Cheol-Woo
    Son, Hyeon-Taek
    Powiązania:
    https://bibliotekanauki.pl/articles/2203721.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Fe powder
    heat-treatment
    microstructure
    density
    Opis:
    In this study, the effects of heat-treatment conditions of Fe powder compacts on densification, microstructure, strength and magnetic properties were investigated. The prepared Fe powder was compressed in a mold of diameter 20 mm at a pressure of 800 MPa for 30 sec. This Fe powder compact was heat-treated under different atmospheres (air and 90% Ar + 10% H2 and heat-treatment temperatures (300 and 700℃). The Fe powder compacts heat-treated in an Ar+H2 mixed gas atmosphere showed a denser microstructure and higher density than the Fe powder compacts heat-treated in an air atmosphere. Oxygen content in the heat-treatment conditions played a significant role in the improvement of the densification and magnetic properties.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 47--50
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Extrusion Temperature on Extrudability of Al-Zn-Cu Based Alloy
    Autorzy:
    Kim, Yong-Ho
    Yoo, Hyo-Sang
    Lee, Kyu-Seok
    Lee, Sung-Ho
    Son, Hyeon-Taek
    Powiązania:
    https://bibliotekanauki.pl/articles/354298.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum
    extrusion
    EBSD
    mechanical property
    Opis:
    In this study, the extrusion characteristics of Al-2Zn-1Cu-0.5Mg-0.5RE alloys at 450, 500, and 550°C were investigated for the high formability of aluminum alloys. The melt was maintained at 720°C for 20 minutes, then poured into the mold at 200°C and hot-extruded with a 12 mm thickness bar at a ratio of 38:1. The average grain size was 175.5, 650.1, and 325.9 μm as the extrusion temperature increased to 450, 500 and 550°C, although the change of the phase fraction was not significant as the extrusion temperature increased. Cube texture increased with the increase of extrusion temperature to 450, 500 and 550°C. As the extrusion temperature increased, the electrical conductivity increased by 47.546, 47.592 and 47.725%IACS, and the tensile strength decreased to 92.6, 87.5, 81.4 MPa. Therefore, the extrusion temperature of Al extrusion specimen was investigated to study microstructure and mechanical properties.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1307-1310
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dual Speed Laser Remelting for High Densification in H13 Tool Steel Metal 3D Printing
    Autorzy:
    Jung, Im Doo
    Choe, Jungho
    Yun, Jaecheol
    Yang, Sangsun
    Yang, Dong-Yeol
    Kim, Yong-Jin
    Yu, Ji-Hun
    Powiązania:
    https://bibliotekanauki.pl/articles/353737.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal 3d printing
    powder bed fusion
    selective laser melting
    H13 tool steel
    remelting
    Opis:
    The densification behavior of H13 tool steel powder by dual speed laser scanning strategy have been characterized for selective laser melting process, one of powder bed fusion based metal 3d printing. Under limited given laser power, the laser re-melting increases the relative density and hardness of H13 tool steel with closing pores. The single melt-pool analysis shows that the pores are located on top area of melt pool when the scanning speed is over 400 mm/s while the low scanning speed of 200 mm/s generates pores beneath the melt pool in the form of keyhole mode with the high energy input from the laser. With the second laser scanning, the pores on top area of melt pools are efficiently closed with proper dual combination of scan speed. However pores located beneath the melt pools could not be removed by second laser scanning. When each layer of 3d printing are re-melted, the relative density and hardness are improved for most dual combination of scanning. Among the scan speed combination, the 600 mm/s by 400 mm/s leads to the highest relative density, 99.94% with hardness of 53.5 HRC. This densification characterization with H13 tool steel laser re-melting can be efficiently applied for tool steel component manufacturing via metal 3d printing.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 571-578
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Si Addition on Microstructure and Mechanical Properties of the Al Alloys with High Cr Content Prepared by Gas Atomization and SPS Processes
    Autorzy:
    Kim, Yong-Ho
    Oh, Ik-Hyun
    Yoo, Hyo-Sang
    Park, Hyun-Kuk
    Lee, Jung-Han
    Son, Hyeon-Taek
    Powiązania:
    https://bibliotekanauki.pl/articles/354961.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Cr-Si
    gas atomization
    spark plasma sintering
    powder
    rapid solidification
    Opis:
    This research describes effects of Si addition on microstructure and mechanical properties of the Al-Cr based alloys prepared manufactured using gas atomization and SPS (Spark Plasma Sintering) processes. The Al-Cr-Si bulks with high Cr and Si content were produced successfully using SPS sintering process without crack and obtained fully dense specimens close to nearly 100% T. D. (Theoretical Density). Microstructure of the as-atomized Al-Cr-Si alloys with high contents of Cr and Si was composed multi-phases with hard and thermally stable such as Al13Cr4Si4, AlCrSi, Al8Cr5 and Cr3Si intermetallic compounds. The average hardness values were 703 Hv for S5, 698 Hv for S10 and 824 Hv for S20 alloy. Enhancement of hardness value was resulted from the formation of the multi-intermetallic compound with hard and thermally stable and fine microstructure by the addition of high Cr and Si using rapid solidification and SPS process.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1045-1049
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Recovery of Valuable Metals in Spent Lithium-Ion Batteries by Al2O3-SiO2-CaO-Fe2O3 Slag System
    Autorzy:
    Moon, Tae Boong
    Han, Chulwoong
    Hyun, Soong-Keun
    Park, Sung Cheol
    Son, Seong Ho
    Lee, Man Seung
    Kim, Yong Hwan
    Powiązania:
    https://bibliotekanauki.pl/articles/2049176.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spent lithium-ion battery
    smelting
    Al2O3-SiO2-CaO-Fe2O3
    recovery
    slag
    Opis:
    This study investigated the recovery behavior of valuable metals (Co, Ni, Cu and Mn) in spent lithium ion-batteries based on Al2O3-SiO2-CaO-Fe2O3 slag system via DC submerged arc smelting process. The valuable metals were recovered by 93.9% at the 1250°C for 30 min on the 20 Al2O3-40SiO2-20Cao-20Fe2O3 (mass%) slag system. From the analysis of the slag by Fourier-transform infrared spectroscopy, it was considered that Fe2O2 and Al2O3 acted as basic oxides to depolymerize SiO4 and AlO4 under the addition of critical 20 mass% Fe2O3 in 20 Al2O3-40SiO2-Cao-Fe2O3 (Cao + Fe2O3 = 40 mass%). in addition, it was observed that the addition of Fe2O3 ranging between 20 and 30 mass% lowers the melting point of the slag system.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 983-986
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure Formation of Al-5 mass%Mg Alloy Melts by Interaction with Silica
    Autorzy:
    Kim, Sun-Ki
    Ha, Seong-Ho
    Kim, Bong-Hwan
    Yoon, Young-Ok
    Lim, Hyun-Kyu
    Kim, Shae K.
    Kim, Yong-Jig
    Powiązania:
    https://bibliotekanauki.pl/articles/2049152.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al-Mg system
    silica
    reduction
    Mg2Si
    phase diagram
    Opis:
    Dissolution of Si in Al-5 mass%Mg alloy melt by the reduction of SiO2 and its effect on microstructure formation of the alloy after solidification were investigated. Al-5 mass%Mg alloy without silica powder had approximately 0.05 mass%Si as an impurity. No significant difference in Si content was observed after the reaction with silica for 10 min, while the Si content increased up to about 0.12 mass% after 30 min. From the microstructure analysis and calculation of Scheil-Gulliver cooling, it was considered that as-cast microstructures of Al-5 mass%Mg-1 mass% SiO2 alloys had the distribution of eutectic phase particles, which are comprised of β-Al3Mg2 and Mg2Si phases. Based on the phase diagrams, only limited amount of Mg can be selectively removed by silica depending on the ratio of Si and Mg. Addition of silica of more than approximately 1.5 mass% in Al-5 mass%Mg alloy led to the formation of spinel and removal of both mg and Al from the melt.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 947-950
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Education and Research on Polish Studies in Korea
    Autorzy:
    Cheong, Kwon Byung
    Kim, Jong Suck
    Choi, Sung Eun (Estera Czoj)
    Kim, Yong Deog
    Kim, Ji Young
    Lee, Ok Jin
    Lee, Ji Wone
    Koh, Seung Hui
    Powiązania:
    https://bibliotekanauki.pl/articles/26414309.pdf
    Data publikacji:
    2013-06-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    Polish studies
    Korea
    Department of Polish Studies
    HUFS
    Opis:
    Polish education and research in Korea has become systematic since the establishment of the Department of Polish Studies at Hankuk University of Foreign Studies (HUFS). The Department of Polish Studies at HUFS is the only academic department in Korea which teaches and studies the politics, economy, history, and culture of Poland, as well as the Polish language and literature. Since its establishment in 1987, the department has produced more than 800 graduates. The Department of Polish Studies forms and maintains a close relationship with universities in Poland. It also makes continuous effort for more students to study the Polish language at universities in Poland.
    Źródło:
    The New Educational Review; 2013, 32; 19-34
    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
    Tytuł:
    Życie kulturalne Polaków w Mandżurii w latach 1897–1947
    Cultural life of Poles in Manchuria, 1897–1947
    Autorzy:
    Yong-Deog, Kim
    Powiązania:
    https://bibliotekanauki.pl/articles/511299.pdf
    Data publikacji:
    2010
    Wydawca:
    Wydawnictwo Uniwersytetu Śląskiego
    Tematy:
    Poles in Manchuria
    Manchuria
    Opis:
    The article is dedicated to the Polish colony in Manchuria, which came into being at the turn of the 19th and 20th centuries and lasted for over 50 years. In successive parts, the author discusses manifestations of cultural life of Poles in Manchuria. He concentrates mostly on Polish cultural institutions created by Poles, the magazines they published. The author points out the merits of some greatest representatives of the colony. The important role was also played by Polish Consulate in Harbin and its workers dedicated to their tasks. After the Second World War broke out, the situation of Polish community became more difficult, and the colony ceased to exist under communist regime in China. Poles left and material traces of their residence in Manchuria also ceased to exist.
    Źródło:
    Postscriptum Polonistyczne; 2010, 2(6); 117-142
    1898-1593
    2353-9844
    Pojawia się w:
    Postscriptum Polonistyczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on North Korea’s Education-Centering for Middle School
    Autorzy:
    Eun-Jung, Kim
    Ju-Cheol, Shin
    Yong-Deog, Kim
    Powiązania:
    https://bibliotekanauki.pl/articles/2028735.pdf
    Data publikacji:
    2014-03-31
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    education
    North Korea’s middle school
    interview
    North Korean defectors
    developed communist
    Opis:
    This paper deals with the reality of North Korea’s education and its middle school education. North Korea still maintains its own curtain and remains isolated from the rest of the world. For that reason, it is very difficult for an individual researcher to get closer to the reality of North Korea’s education. To overcome the limitation, this article actively utilizes a means- interview with defectors who live in South Korea. To understand the current situation of North Korean education, the author interviewed 38 students. It is very useful in order to know the reality that cannot be accessed in the official way. This article firstly examines the general goals of North Korean education and the characteristics of the school curriculum. Next, this paper describes the features of North Korea’s middle school students’ life. Through examining the educational situation of North Korea, the principles of North Korean education have been revealed as fostering newly developed communists. Furthermore, it is a principle that the texts included in North Korea’s national language textbooks should stick to the communist partisanship and reflect socialist patriotism.
    Źródło:
    The New Educational Review; 2014, 35; 151-162
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Measures for the Improvement of History Education for Chinese Students in South Korea
    Autorzy:
    Hyoung-jin, Moon
    Jong-ho, Nam
    Yong-deog, Kim
    Powiązania:
    https://bibliotekanauki.pl/articles/2031731.pdf
    Data publikacji:
    2014-09-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    Chinese students
    history knowledge
    history teaching methods
    Korean history
    Opis:
    The objective of this research was to find a more effective method for the teaching of history to Chinese students studying in South Korean universities. Questionnaire surveys and interviews were conducted to investigate those students’ level of knowledge and perceptions of Korean history. Then, in history classes, four teaching methods (comparative-historical, audiovisual, history and language, and rote memorization) were applied over two weeks. Before the treatment, Chinese students said that they liked the audiovisual teaching method the most, but after taking the classes, they preferred the teaching method comparing Korean and Chinese histories. Besides the finding that the comparative method was the most popular, the responses also showed that it was the most effective one in teaching history to Chinese students.
    Źródło:
    The New Educational Review; 2014, 37; 54-65
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Post-Heat Treatment on the Impact Toughness and Crack Propagation Mechanism of AISI D2 Tool Steel Manufactured by Direct Energy Deposition
    Autorzy:
    Park, Jun-Hyung
    Kim, Kyu-Sik
    Koo, Yong-Mo
    Kim, Jin-Young
    Kim, Min-Chul
    Lee, Kee-Ahn
    Powiązania:
    https://bibliotekanauki.pl/articles/2203722.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AISI D2 tool steel
    direct energy deposition
    post-heat treatment
    impact toughness
    fractography
    Opis:
    This study investigated the effect of heat treatment on the microstructure and impact toughness property of AISI D2 manufactured with direct energy deposition (DED) and compared the results with conventional wrought material. The fracture crack propagation behavior was examined in connection with microstructures through fracture surface analysis. AISI D2 manufactured with DED had a eutectic structure that turned into a net-type carbide after heat treatment, and Cr-rich needle-type secondary carbide was observed. Impact toughness of DED AISI D2 measured 2.0 J/cm2 in the as-built sample and 1.1 J/cm2 in the heat-treated sample. Compared to a wrought heat-treated AISI D2, DED AISI D2 had relatively low impact toughness. DED AISI D2 and wrought material had different crack propagation mechanisms. In DED AISI D2, the eutectic structure and net-type carbide boundary were identified as the major microstructural factor decreasing impact toughness.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 119--122
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soaking Soybean Seeds with Abeliophyllum distichum Nakai Extract Increased the Yield and Nutritional Value of Soybean Sprouts
    Autorzy:
    Kim, Jeong-Ho
    Yoon, Yong-Han
    Dhungana, Sanjeev Kumar
    Kim, Il-Doo
    Shin, Dong-Hyun
    Powiązania:
    https://bibliotekanauki.pl/articles/2051042.pdf
    Data publikacji:
    2022-06-02
    Wydawca:
    Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
    Tematy:
    amino acid
    color parameters
    isoflavone
    mineral
    vitamin C
    Opis:
    Abeliophyllum distichum Nakai, an ornamental plant, contains a wide range of phytochemicals having pharmaceutical properties. The use of different plant-based extracts for the enhancement of yield and/or quality of soybean sprouts, one of the most inexpensive but nutritious food products, is common. The objective of this study was to examine the effect of A. distichum flower extract (ADE) on the yield and nutritional value of soybean sprouts. Soybean seeds were soaked in ADE solutions with concentrations (w/v) of 0.5% (ADE-0.5), 1% (ADE-1), 3% (ADE-3), and 5% (ADE-5). The effect of ADE concentration on the yield and different nutrient components varied. The highest soybean sprout yield and vitamin C content were found with ADE-3. The most abundant essential amino acid content was detected in ADE-1, whereas the greatest amounts of total isoflavones and total minerals were determined in ADE-5 and the ADE-untreated control, respectively. Overall results of yield, color, and contents of vitamin C, amino acids, and isoflavones suggest that 1% or 3% of A. distichum extract could be an optimum concentration to soak the soybean seeds for higher sprout yield and nutrient content.
    Źródło:
    Polish Journal of Food and Nutrition Sciences; 2022, 72, 2; 151-158
    1230-0322
    2083-6007
    Pojawia się w:
    Polish Journal of Food and Nutrition Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat Treatment Effect on Physical Properties of Stainless Steel / Inconel Bonded by Directed Energy Deposition
    Autorzy:
    Eom, Yeong Seong
    Kim, Kyung Tae
    Kim, Dong Won
    Yu, Ji-Hun
    Sim, Chul Yong
    An, Seung Jun
    Park, Yong-Ha
    Son, Injoon
    Powiązania:
    https://bibliotekanauki.pl/articles/2049122.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    directed energy deposition
    interface
    physical properties
    heat treatment
    Opis:
    In this study, stainless steel 316L and Inconel 625 alloy powders were additively manufactured by using directed energy deposition process. And heat treatment effect on hardness and microstructures of the bonded stainless steel 316L/Inconel 625 sample was investigated. The microstructures shows there are no secondary phases and big inclusions near interfacial region between stainless steel 316L and Inconel 625 except several small cracks. The results of TEM and Vickers Hardness show the interfacial area have a few tens of micrometers in thickness. Interestingly, as the heat treatment temperature increases, the cracks in the stainless steel region does not change in morphology while both hardness values of stainless steel 316L and Inconel 625 decrease. These results can be used for designing pipes and valves with surface treatment of Inconel material based on stainless steel 316L material using the directed energy deposition.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 1049-1054
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Deformation Temperature on the Magnetic Properties of PrFeB Alloy Fabricated by Gas Atomization
    Autorzy:
    Cho, Ju-Young
    Song, Myung-Suk
    Choa, Yong-Ho
    Kim, Taek-Soo
    Powiązania:
    https://bibliotekanauki.pl/articles/2049154.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PrFeB alloy
    gas atomization
    plastic deformation
    rolling
    REFeB magnet
    Opis:
    To form the fine micro-structures, the Pr17Fe78B5 magnet powders were produced in the optimized gas atomization conditions and it was investigated that the formation of the textures, microstructures, and the changes in the magnetic properties with increasing the deformation temperatures and rolling directions. Due to the rapid cooling system than the casting process, the homogenous microstructures were composed of the Pr-rich and Pr2Fe14B without any oxides and α-Fe and enables grain refinement. The pore ratios were 2.87, 1.42, and 0.22% at the deformation temperatures of 600, 700, 800°C, respectively in the rolled samples to align the c-axis which is the magnetic easy axis. Because Pr-rich phase cannot flow into the pore with a liquid state at low temperature, the improvement of pore densification was gradually observed with increasing deformation temperature. To confirm the magnetic decoupling effects of Pr2Fe14B phases by Pr-rich phases, the magnetic properties were investigated in rolled samples produced at the deformation temperature of 800°C. Although the remanent field is slightly decreased by 30%, the coercivity fields increased by about 2 times than that previous casted ingot. It is suggested that the gas atomization method can be suitable for fabricating grain refined and pure PrFeB magnets, and the plastic deformation conditions and rolling directions are a critical role to manipulate microstructure and magnetic properties.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 955-958
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Powder Size on the Microstructure and Magnetic Properties of Nd-Fe-B Magnet Alloy
    Autorzy:
    Cho, Ju-Young
    Abbas, Sardar Farhat
    Choa, Yong-Ho
    Kim, Taek-Soo
    Powiązania:
    https://bibliotekanauki.pl/articles/353634.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Nd-Fe-B
    gas atomization
    powder size
    crystal orientation
    hot deformation
    Opis:
    Rare earth Nd-Fe-B, a widely used magnet composition, was synthesized in a shape of powders using gas atomization, a rapid solidification based process. The microstructure and properties were investigated in accordance with solidification rate and densification. Detailed microstructural characterization was performed by using scanning electron microscope (SEM) and the structural properties were measured by using X-ray diffraction. Iron in the form of α-Fe phase was observed in powder of about 30 μm. It was expected that fraction of Nd2 Fe14 B phase increased rapidly with decrease in powder size, on the other hand that of α-Fe phase was decreased. Nd-rich phase diffused from grain boundary to particle boundary after hot deformation due to capillary action. The coercivity of the alloy decreased with increase in powder size. After hot deformation, Nd2 Fe14 B phase tend to align to c-axis.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 623-626
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of Nd-Fe-B Morphology as Function of the PVP Concentration Using Electrospinning Process
    Autorzy:
    Eom, Nu Si A.
    Haq, Muhammad Aneeq
    Lee, Jimin
    Lim, Kyoung Mook
    Kim, Taek-Soo
    Choa, Yong-Ho
    Kim, Bum Sung
    Powiązania:
    https://bibliotekanauki.pl/articles/351180.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Nd2Fe14B
    1-D magnet fiber
    electrospinning
    magnet properties
    morphology
    Opis:
    In this study, we demonstrate a facile and cost-effective way to synthesize Nd-Fe-B of various shapes such as powders, rods and fibers using electrospinning, heat-treatment and washing procedures. Initially Nd-Fe-B fibers were fabricated using electrospinning. The as-spun Nd-Fe-B fibers had diameters ranging 489 to 630 nm depending on the PVP concentration in reaction solutions. The different morphologies of the Nd2Fe14B magnetic materials were related to the difference in thickness of the as-spun fibers. The relationships between the as-spun fiber thickness, the final morphology, and magnetic properties were briefly elucidated. The intrinsic coercivity of Nd2Fe14B changed with the change in morphology from powder (3908 Oe) to fiber (4622 Oe). This work demonstrates the effect of the Nd-Fe-B magnetic properties with morphology and can be extended to the experimental design of other magnetic materials.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 993-996
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Temperature on the Plastic Deformability of Gas Atomized NdFeB Anisotropic Magnets
    Autorzy:
    Cho, Ju-Young
    Choa, Yong-Ho
    Nam, Sun-Woo
    Rasheed, Mohammad Zarar
    Kim, Taek-Soo
    Powiązania:
    https://bibliotekanauki.pl/articles/351923.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    NdFeB permanent magnet
    stoichiometric composition
    gas atomization
    plastic deformability
    crystal orientation
    Opis:
    NdFeB anisotropic sintered permanent magnets are typically fabricated by strip casting or melt spinning. In this study, the plastic deformability of an NdFeB alloy was investigated to study the possibility of fabricating anisotropic sintered magnets using gas atomized powders. The results show that the stoichiometric composition Nd12Fe82B6 softens at high temperatures. The aspect ratio and orientation factor of Nd12Fe82B6 billets after plastic deformation were found to increase with increasing plastic deformation temperature, particularly above 800°C. This confirms that softening at high temperatures can lead to plastic deformation of Nd2Fe14B hard magnetic phases.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1293-1296
    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:
    Effect of Nb and Mo Addition on the Microstructure and Wear Behavior of Fe-Cr-B Based Metamorphic Alloy Coating Layer Manufactured by Plasma Spray Process
    Autorzy:
    Cho, Yong-Hoon
    Ham, Gi-Su
    Park, So-Yeon
    Kim, Choongnyun Paul
    Lee, Kee-Ahn
    Powiązania:
    https://bibliotekanauki.pl/articles/2174563.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    plasma spray
    Fe-Cr-B based metamorphic alloy
    Nb addition
    microstructure
    wear
    Opis:
    Fe-Cr-B-based metamorphic alloy coating layers were manufactured by plasma spray with a Fe-Cr-B-Mo-Nb composition (hereinafter, M+) powder. The microstructure and wear properties of the coating layers were investigated and compared with a metamorphic alloy coating layer fabricated with commercial m material. XRD analysis revealed that the M and M+ coating layers were composed of α-Fe, (Cr, Fe)2B, and some metallic glass phases. Wear test results showed that M+ coating layers had a superior wear resistance which had 1.48 times lower wear volume than M coating layers. Observations of the worn-out surfaces and cross-sections of the coating layers showed that M+ coating layer had relatively low oxides along the particle boundaries and it suppress a delamination behavior by the oxides.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1521--1524
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Dynamic Charge Carrier Transport Behaviors in Zirconium Oxide for Nuclear Cladding Materials
    Autorzy:
    Park, Il-Kyu
    Lee, Sang-Seok
    Mok, Yong Kyoon
    Jeon, Chan-Woo
    Kim, Hyun-Gil
    Powiązania:
    https://bibliotekanauki.pl/articles/351043.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zirconium
    nuclear cladding
    Zr oxide
    capacitance-voltage
    current-voltage
    Opis:
    Dynamic charge carrier transport behavior in the zirconium (Zr) oxide was investigated based on the frequency-dependent capacitance-voltage (C-V) and temperature-dependent current-voltage (I-V) measurements. The Zr oxide was formed on the ZIRLO and newly developed zirconium-based alloy (NDZ) by corrosion in the PWR-simulated loop at 360°C. The corrosion test for 90 days showed that the NDZ exhibits better corrosion resistance than ZIRLO alloy. Based on the C-V measurement, dielectric constant values for the Zr oxide was estimated to be 11.28 and 11.52 for the ZIRLO and NDZ. The capacitance difference between low and high frequency was larger in the ZIRLO than in the NDZ, which was attributed to more mobile electrical charge carriers in the oxide layer on the ZIRLO alloy. The current through the oxide layers on the ZIRLO increased more drastically with increasing temperature than on the NDZ, which indicating that more charge trap sites exist in the ZIRLO than in NDZ. Based on the dynamiccharge carrier transport behavior, it was concluded that the electrical charge carrier transport within the oxide layers was closely related with the corrosion behavior of the Zr alloys.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1063-1067
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrothermal Properties and RF Transmittance of Spray-coated CNT Thin Film for Radome De-icing Application
    Autorzy:
    Jung, Jun Hyuk
    Hong, Jiwon
    Kim, Youngryeul
    Yong, Seok-Min
    Park, Jinwoo
    Lee, Seung Jun
    Powiązania:
    https://bibliotekanauki.pl/articles/351163.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    De-icing
    CNT thin film
    spray coating
    electrothermal property
    RF transmittance
    Opis:
    Ice formed on radome surfaces causes communication disruption due to radio-frequency interference (RFI), which reveals the importance of de-icing systems for radomes. As a radome de-icing application, in this work, carbon nanotube (CNT) thin films were fabricated using a spray-coating method, and influence of process parameters on RF transmittance and electrothermal propertieswas investigated. With the increase of spraying time, sheet resistance of the fabricated film decreases, which results in a decrease of the RF transmittance and improvement of the heating performance. Also, the de-icing capability of the fabricated CNT film was evaluated at –20°C, and efficient removal of ice under cold conditions was demonstrated.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1011-1014
    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:
    Effect of Cooling Rate on the Microstructure and Mechanical Properties of Al-33 wt.% Cu Alloy
    Autorzy:
    Lee, Yeon-Joo
    Kwon, Do-Hun
    Cha, Eun-Ji
    Song, Yong-Wook
    Choi, Hyun Joo
    Kim, Hwi-Jun
    Powiązania:
    https://bibliotekanauki.pl/articles/2203708.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    laser melting
    cooling rate
    lamellar spacing
    hardness
    Al-33wt.%Cu alloy
    Opis:
    Directed energy deposition (DED) is an additive manufacturing process wherein an energy source is focused on a substrate on which a feedstock material is simultaneously delivered, thereby forming a small melt pool. Melting, solidification, and subsequent cooling occur at high rates with considerable thermal gradients compared with traditional metallurgical processes. Hence, it is important to examine the effects of cooling rates on the microstructures and properties of the additive manufactured materials. In this study, after performing DED with various energy densities, we investigated the changes in the microstructures and Vickers hardness of cast Al-33 wt.% Cu alloy, which is widely used to estimate the cooling rate during processing by measuring the lamellar spacing of the microstructure after solidification. The effects of the energy density on the cooling rate and resultant mechanical properties are discussed, which suggests a simple way to estimate the cooling rate indirectly. This study corresponds to the basic stage of the current study, and will continue to apply DED in the future.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 43--46
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of ZrO2 and Al2O3 Addition on the Physical Properties of Cu-Mo-Cr Alloy by Liquid Phase Sintering
    Autorzy:
    Cho, Yeong-Woo
    Sim, Jae-Jin
    Heo, Sung-Gue
    Kim, Hyun-Chul
    Lee, Yong-Kwan
    Byeon, Jong-Soo
    Lee, Yong-Tak
    Lee, Kee-Ahn
    Seo, Seok-Jun
    Park, Kyoung-Tae
    Powiązania:
    https://bibliotekanauki.pl/articles/2049193.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al2O3
    ZrO2
    Cu-Mo-Cr
    sintering
    powder metallurgy
    Opis:
    In this study, the effect of the addition of ZrO2 and Al2O3 ceramic powders to Cu-Mo-Cr alloy was studied by examining the physical properties of the composite material. The ceramic additives were selected based on the thermodynamic stability calculation of the Cu-Mo-Cr alloys. Elemental powders, in the ratio Cu:Mo:Cr = 60:30:10 (wt.%), and approximately 0-1.2 wt.% of ZrO2 and Al2O3 were mixed, and a green compact was formed by pressing the mixture under 186 MPa pressure and sintering at 1250°C for 5 h. The raw powders were evenly dispersed in the mixed powder, as observed by scanning electron microscopy. After sintering, the microstructures, densities, electrical conductivities, and hardness of the composites were evaluated. We found that the addition of ZrO2 and Al2O3 increased the hardness and decreased the electrical conductivity and density of the composites.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 683-687
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Production of High-Purity Tantalum Metal Powder for Capacitors Using Self-Propagating High-Temperature Synthesis
    Autorzy:
    Lee, Yong-Kwan
    Sim, Jae-Jin
    Byeon, Jong-Soo
    Lee, Yong-Tak
    Cho, Yeong-Woo
    Kim, Hyun-Chul
    Heo, Sung-Gue
    Lee, Kee-Ahn
    Seo, Seok-Jun
    Park, Kyoung-Tae
    Powiązania:
    https://bibliotekanauki.pl/articles/2049150.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tantalum
    self-propagating high-temperature synthesis
    tantalum oxide
    magnesium
    capacitor
    Opis:
    In this study, high-purity tantalum metal powder was manufactured via self-propagating high-temperature synthesis. During the process, Ta2O5 and Mg were used as the raw material powder and the reducing agent, respectively, and given that combustion rate and reaction temperature are important factors that influence the success of this process, these factors were controlled by adding an excessive mass of the reducing agent (Mg) i.e., above the chemical equivalent, rather than by using a separate diluent. It was confirmed that Ta metal powder manufactured after the process was ultimately manufactured 99.98% high purity Ta metal powder with 0.5 μm particle size. Thus, it was observed that adding the reducing reagent in excess favored the manufacture of high-purity Ta powder that can be applied in capacitors.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 935-939
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Efficiency Cooling System Using Additive Manufacturing
    Autorzy:
    Woo, Yeong-Jin
    Nam, Dong-Ho
    Lee, Seok-Rok
    Kim, Eun-Ah
    Lee, Woo-Jin
    Yang, Dong-Yeol
    Yu, Ji-Hun
    Park, Yong-Ho
    Lee, Hak-Sung
    Powiązania:
    https://bibliotekanauki.pl/articles/2049198.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    additive manufacturing
    DfAM
    Design for Additive Manufacturing
    cooling system
    lattice structure
    simulation
    Opis:
    In this study, we propose a cooling structure manufactured using a specialized three-dimensional (3D) printing design method. A cooling performance test system with complex geometry that used a thermoelectric module was manufactured using metal 3D printing. A test model was constructed by applying additive manufacturing simulation and computational fluid analysis techniques, and the correlation between each element and cooling efficiency was examined. in this study, the evaluation was conducted using a thermoelectric module base cooling efficiency measurement system. The contents were compared and analyzed by predicting the manufacturing possibility and cooling efficiency, through additive manufacturing simulation and computational fluid analysis techniques, respectively.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 689-693
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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