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    Wyświetlanie 1-12 z 12
    Tytuł:
    Effect of Powder Shape and Sintering Temperature on the Preparation of Ni-Based Porous Metal
    Autorzy:
    Yi, Yu-Jeong
    Lee, Min-Jeong
    Kim, Hyeon-Ju
    Yang, Sangsun
    Park, Man-Ho
    Kim, Byoung-Kee
    Yun, Jung-Yeul
    Powiązania:
    https://bibliotekanauki.pl/articles/351782.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Hastelloy
    porosity
    porous metal
    powder shape
    sintering temperature
    Opis:
    Usually porous metals are known as relatively excellent characteristic such as large surface area, light, lower heat capacity, high toughness and permeability for exhaust gas filter, hydrogen reformer catalyst support. The Ni alloys have high corrosion resistance, heat resistance and chemical stability for high temperature applications. In this study, the Ni-based porous metals have been developed with Hastelloy powder by gas atomization and water atomization in order to find the effects of powder shape on porous metal. Each Hastelloy powder is pressed on disk shape of 2 mm thickness with 12 tons using uniaxial press machine. The specimens are sintered at various temperatures in high vacuum condition. The pore properties were evaluated using Porometer and microstructures were observed with SEM.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 917-920
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    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:
    Corrosion Behavior of Hastelloy® C-2000® Ni-Cr-Mo-Fe Alloys in the Entrained-Flow Coal Gasification Syngas Plants
    Autorzy:
    Lee, Sungkyu
    Kim, Min-Jung
    Choi, Nuri
    Hwang, Sang Yeon
    Chung, Seok-Woo
    Lee, Seung-Kong
    Yun, Yongseung
    Powiązania:
    https://bibliotekanauki.pl/articles/352403.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mixed oxidant corrosion
    Hastelloy® C-2000® Ni-Cr-Mo-Fe alloy
    coal gasification
    high temperature halogencorrosion
    hydrated chlorides
    Opis:
    A mechanistic exposure experiment was performed on the commercially available and welded Ni-Cr-Mo-Fe alloy samples used in the piping materials of the coal gasification pilot plant. Thermodynamic Ellingham-Pourbaix stability diagrams were constructed to provide insight into the mechanism of the observed corrosion behavior. The thermodynamic inference on the corrosion mechanism was supplemented with the morphological, compositional and microstructural analyses of the exposed samples using scanning electron microscopy, X-ray diffraction and energy-dispersive X-ray spectroscopy analyses. X-ray diffraction result revealed stable corrosion products of NiO, MoNi4 and Cr4.6 MoNi2.1 after accumulated total exposure duration of 139 h to the corrosive atmosphere. Scanning electron microscopy and energy-dispersive X-ray spectroscopy positively identified formation of rather continuous and adherent pre-oxidation corrosion products although extensively peeled-off oxides were finally observed as corrosion scales on the post-exposure alloy samples, which were attributed to the chlorination/oxidation into thin (spalled) oxides.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 869-878
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of Agar-Silica Aerogel Nanocomposite Films
    Autorzy:
    Lee, Min-Jin
    Jung, Hyun-Ah
    Lee, Kyong-Jin
    Hwang, Haejin
    Powiązania:
    https://bibliotekanauki.pl/articles/356287.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal insulation film
    silica aerogel
    agar
    thermal conductivity
    transmittance
    Opis:
    In this study, agar-based nanocomposite films containing ultra-porous silica aerogel particles were fabricated by gel casting using an aqueous agar/silica aerogel slurry. The silica aerogel particles did not show significant agglomeration and were homogeneously distributed in the agar matrix. Transmission electron microscopy observations demonstrated that the silica aerogel particles had a mesoporous microstructure and their pores were not incorporated into the agar polymer molecules. The thermal conductivities of the agar and agar/5wt.% silica aerogel nanocomposite films were 0.36 and 0.20 W·m-1·K-1, respectively. The transmittance of the agar films did not decrease upon the addition of silica aerogel particles into them. This can be attributed to the anti-reflection effect of silica aerogel particles.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 851-855
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Study on Pore Properties of Hastelloy Powder Porous Metal Fabricated by Electrostatic Powder Coating
    Autorzy:
    Lee, Min-Jeong
    Yi, Yu-Jeong
    Kim, Hyeon-Ju
    Park, Man-Ho
    Kim, Byoung-Kee
    Yun, Jung-Yeul
    Powiązania:
    https://bibliotekanauki.pl/articles/353929.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrostatic powder coating
    Hastelloy
    porous metal
    pore properties
    powder coating amount
    Opis:
    Porous metals show not only extremely low density, but also excellent physical, mechanical and acoustic properties. In this study, Hastelloy powders prepared by gas atomization are used to manufacture 3D geometries of Hastelloy porous metal with above 90% porosity using electrostatic powder coating process. In order to control pore size and porosity, foam is sintered at 1200~1300°C and different powder coating amount. The pore properties are evaluated using SEM and Archimedes method. As powder coating amount and sintering temperature increased, porosity is decreased from 96.4 to 94.4%. And foam density is increased from 0.323 to 0.497 g/cm3 and pore size is decreased from 98 to 560 μm. When the sintering temperature is increased, foam thickness and strut thickness are decreased from 9.85 to 8.13 mm and from 366 to 292 μm.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 2; 547-550
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Pore Properties of SUS316L Membrane with Double-Layered Pore Structures by Wet Powder Spraying
    Autorzy:
    Lee, Min-Jeong
    Kim, Hyeon-Ju
    Park, Manho
    Yun, Jung-Yeul
    Powiązania:
    https://bibliotekanauki.pl/articles/2174566.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wet powder spraying process
    double-layered pore structures
    powder shape
    spherical
    flake
    Opis:
    In this study, a SUS316L membrane having double layered pore structures was fabricated, and the pore characteristics were analyzed after coating with a spherical powder and a flake-shaped powder on a disk-shaped SUS316L support using a wet powder spraying process. The thickness of the coated layer was checked using an optical microscope, and air permeability was measured using a capillary flow porometer. When the coating amount was similar, the fine porous layer prepared using flake powder was thicker and showed higher porosity. In the case of a similar thickness, the case of using flake powder was half of the amount of spherical powder used. Therefore, it was confirmed that it is possible to manufacture a metal membrane having a high filter efficiency even with a small coating amount when using the flake powder.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1531--1534
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure and Pore Characteristics of a SUS316L Gas Filter Fabricated by Wet Powder Spraying
    Autorzy:
    Lee, Min-Jeong
    Yi, Yu-Jeong
    Kim, Hyeon-Ju
    Park, Manho
    Lee, Jungwoo
    Yun, Jung-Yeul
    Powiązania:
    https://bibliotekanauki.pl/articles/2174584.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wet powder spraying process
    double pore structures
    pore properties
    rotation speed
    coating time
    Opis:
    In this study, a flake-shaped metal powder was coated on a tube shaped pre-sintered 316L stainless steel support using a wet powder spraying process to fabricate a double pore structure, and the pore characteristics were analyzed according to coating time and tube rotation speed. The thickness of the coated layer was checked via optical microscopy, and porosity was measured using image analysis software. Air permeability was measured using a capillary flow porometer. As a result of the experiment, the optimal rotation speed of the support tube was established as 200 rpm. When the rotation speed was fixed, the coating thickness and the coating amount of the double pore structure increased as the coating time increased. The porosity of the double pore structure was increased due to the irregular arrangement of the flake-shaped powder. The air permeability of the double pore structure decreased with increasing fine pore layer thickness.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 4; 1547--1550
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    THE THEORY ON THE STATE OF THE CHOSŎN RULING ELITES: HOW DID THEY PERCEIVE THE RELATIONS BETWEEN THEMSELVES AND THE STATE?
    조선 지배층의 국가론: 지배층과 국가와의 관계에 대한 논의를 중심으로
    JAK WARSTWA RZĄDZĄCA W CHOSŎN POSTRZEGAŁA RELACJE MIĘDZY NIMI SAMYMI A PAŃSTWEM? PRÓBA UJĘCIA TEORETYCZNEGO
    Autorzy:
    LEE, Min Jung
    Powiązania:
    https://bibliotekanauki.pl/articles/1040200.pdf
    Data publikacji:
    2019-01-24
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    warstwa rządząca w Chosŏn
    kraj
    tożsamość
    arystokracja
    ruling elite in the Chosŏn Dynasty
    the nation
    identity
    nobles
    Opis:
    This paper argues that it is necessary to analyze the identity of the ruling elite in the Chosŏn Dynasty through the nobles munbŏl 문벌(門閥) using the ideological methodology. The identity of the ruling elite in the Joseon Dynasty should be considered in relation to the state. In the first part of this paper, we review the existing studies on the relationship between the ruling elite and the state in Korea. The first group gives a view that the ruling class has autonomy from the state and has an identity outside the country. The second group of the studies shows that the ruling autonomous governments have encroached on the private sector. The third group are studies showing that the ruling class of the Chosŏn Dynasty structurally could not escape the domination of the state. Each of these studies pointed out important points in characterizing the ruling elites of the Chosŏn dynasty, yet they had some limitations because they lacked an ideological consideration of what their identity is fundamentally from. The second part of the paper presents how to overcome these limitations by insisting that the identity of the ruling class should be examined in relation to the state at that time through the issue of civilization.
    Autorka zakłada, że próba analizy warstwy rządzącej za czasów panowania dynastii Chosŏn na przykładzie szlachetnie urodzonych munbŏl 문벌 (門閥) powinna być przeprowadzana przy pomocy analizy ideologicznej, zaś tożsamość warstwy rządzącej należy rozpatrywać w relacji do kraju. Artykuł stanowi analizę istniejących badań, które dzielą się na trzy główne grupy. Pierwsza z grup wysuwa tezę, że warstwa rządząca jest niezależna od kraju i rządu i w takim oderwaniu należy rozpatrywać jej tożsamość. Druga grupa wskazuje na to, że warstwa rządząca opanowała również tzw. sektor prywatny. Trzecia grupa pokazuje, że warstwa ta nie była w stanie odciąć się strukturalnie od rządów. Dalsza część artykułu skupia się na analizie pozostałych punktów charakterystycznych dla koreańskiej warstwy rządzącej.
    본 논문은 조선시대 지배엘리트의 정체성을 파악하기 위해서는 문벌(門閥)이라는 소재를 통해 사상적인 방법론으로 분석하는 것이 필요함을 주장한 논문이다. 조선시대 지배엘리트의 정체성은 국가와의 관계 속에서 고찰되어야 한다. 이를 위해 우선 논문의 전반부에서 조선의 지배엘리트와 국가의 관계에 대해 다룬 기존의 연구들을 세 가지 경향으로 나누어 고찰하였다. 첫 번째 그룹은 지배층이 국가로부터 자율성을 가지며, 국가 밖의 영역에 정체성을 두고 있다고 여기는 연구들이다. 두 번째 그룹은 역시 국가로부터 자율성을 가지는 지배층이 사적 영역으로 국가를 잠식하였다고 보는 연구들이다. 세 번째 그룹은 조선시대 지배층은 구조적으로 국가의 지배를 벗어날 수 없었다고 여기는 연구들이다. 각각의 연구들은 조선시대 지배엘리트의 성격을 파악하는 데에 중요한 지점을 지적하였으나, 그들의 정체성이 근본적으로 무엇으로부터 오는가에 대한 사상적 고찰을 결여했기 때문에 한계를 가진다. 논문의 후반부에서는 이러한 한계를 극복하기 위한 제안으로, 문벌이라는 소재를 통해 당시 지배층의 정체성을 국가와의 관계 속에서 살펴보기를 주장하였다.
    Źródło:
    International Journal of Korean Humanities and Social Sciences; 2018, 4; 107-126
    2449-7444
    Pojawia się w:
    International Journal of Korean Humanities and Social Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of psychological symptoms on life adjustment among survivors of humidifier disinfectants
    Autorzy:
    Lee, Min Joo
    Hong, Soeun
    Jung, Yubin
    Lee, Hun-Ju
    Lee, Sang Min
    Powiązania:
    https://bibliotekanauki.pl/articles/21375377.pdf
    Data publikacji:
    2023-11-27
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    survivors
    psychological symptoms
    adaptive life functioning
    humidifier disinfectant
    social disaster
    somatic complaints
    Opis:
    Objectives The humidifier disinfectant catastrophe in South Korea was a social disaster caused by toxic chemical substances. The present study aimed to examine the relationships between psychological symptoms and adaptive life functioning in survivors of humidifier disinfectants. This study examined the differential effects of psychological symptoms on life adjustment between survivors of humidifier disinfectant and the general population. Material and Methods A total of 452 individuals (228 general and 224 survivor groups) participated in this research. This study utilized the Adult Self-Report, one of the most widely used comprehensive mental health scales for measuring both psychological symptoms (e.g., anxiety/depression) and life adjustment functioning (e.g., interpersonal relationship). For the data analysis, multi-group structural equation modeling analysis was conducted using AMOS 21.0 program. Results The results of this study indicated that attention problems out of 8 psychological symptoms was the only significant factor related to life adjustment in both general and survivor groups. In addition, there was a significant 2-way interaction effect of group status and somatic complaints on life adjustment. Conclusions When the somatic complaint symptom was higher, participants in the survivor group were less likely to adjust in life than the general group. Taken together, the somatic complaints of the survivors more strongly influence the life adjustment than the general population. Finally, the authors discuss practical implications for survivors of humidifier disinfectants for designing suitable intervention strategies.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2023, 36, 5; 596-605
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and performance of dual-band MWIR/LWIR focal plane arrays based on a type-II superlattice nBn structure
    Autorzy:
    Lee, Hyun-Jin
    Eom, Jun Ho
    Jung, Hyun Chul
    Kang, Ko-Ku
    Ryu, Seong Min
    Jang, Ahreum
    Kim, Jong Gi
    Kim, Young Ho
    Jung, Han
    Kim, Sun Ho
    Choi, Jong Hwa
    Powiązania:
    https://bibliotekanauki.pl/articles/2204217.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
    Tematy:
    InAs/GaSb type-II superlattice
    dualband detector
    dark current
    spectral quantum efficiency
    noise equivalent temperature difference
    Opis:
    Dual-band infrared detector, which acquires more image information than single-band detectors, has excellent detection, recognition, and identification capabilities. The dual-band detector can have two bumps to connect with each absorber layer, but it is difficult to implement small pitch focal plane arrays and its fabrication process is complicated. Therefore, the most effective way for a dual-band detector is to acquire each band by biasselectable with one bump. To aim this, a dual-band MWIR/LWIR detector based on an InAs/GaSb type-II superlattice nBn structure was designed and its performance was evaluated in this work. Since two absorber layers were separated by the barrier layer, each band can be detected by bias-selectable with one bump. The fabricated dual-band device exhibited the dark current and spectral response characteristics of MWIR and LWIR bands under negative and positive bias, respectively. Spectral crosstalk that is a major issue in dualband detectors was also improved. Finally, a 20 µm pitch 640 x 512 dual-band detector was fabricated, and both MWIR and LWIR images exhibited an average noise equivalent temperature difference of 30 mK or less at 80 K.
    Źródło:
    Opto-Electronics Review; 2023, 31, Special Issue; art. no. e144560
    1230-3402
    Pojawia się w:
    Opto-Electronics Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Compressive Properties of Open-Cell Ni-Mo-Cr (Hastelloy) Foams Manufactured by Electrostatic Powder Spraying
    Autorzy:
    Kang, Tae-Hoon
    Kim, Kyu-Sik
    Lee, Min-Jeong
    Yun, Jung-Yeul
    Lee, Kee-Ahn
    Powiązania:
    https://bibliotekanauki.pl/articles/356501.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallic foam
    electrostatic powder spraying
    Ni-Mo-Cr alloy
    sintering
    compressive property
    Opis:
    An open-cell Ni-Mo-Cr foam was newly manufactured using electrostatic powder spraying process and its room-temperature compressive properties were investigated in this study. For manufacturing Ni-Mo-Cr foam, Ni-Mo-Cr powders were sprayed on the polyurethane pre-form by electrostatic powder spraying process. And then, Ni-Mo-Cr powder sprayed pre-forms were sintered at 1200°C, 1250°C, and 1300°C, respectively. The relative densities of Ni-Mo-Cr foams were measured at 4 ~ 5%. Room tempera-ture compressive curves of ESP Ni-Mo-Cr foams represented the typical compressive 3-stages (elastic, plateau, densification) of open-cell metallic foam. As a result of observation of deformed specimen, the fracture mode found to be changed from brittle to ductile as sintering temperature increased. Based on these findings, correlations between structural characteristics, microstructure, and compressive deformation behavior were also discussed.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1081-1086
    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
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