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The Analysis of Spectrum on the Barkhausen Noise of Hysteresis Loops on Neutron Irradiated Material
Sim, Cheul-Muu,Chang, Kee-Ok,Park, Kook-Nam,Cho, Man-Soon,Park, Chang-Oong The Acoustical Society of Korea 1999 韓國音響學會誌 Vol.18 No.e1
In relation to a non-destructive evaluation of irradiation damages, the changes in the hysteresis loop and Barkhausen noise amplitude and the harmonics frequency due to a neutron irradiation were measured and evaluated. The Mn-Mo-Ni low alloy steel of RPV was irradiated to a neutron fluence of 2.3 ×10/sup 19/ n/㎠ (E ≥1 MeV) at 288℃. The saturation magnetization of neutron irradiated metal did not change. The neutron irradiation caused the coercivity to increase, whereas susceptibility to decrease. The amplitude of Barkhausen noise parameters associated with the domain wall motion were decreased by a neutron irradiation. The spectrum of Barkhausen noise is analysed with an applied frequency of 4 Hz and 8 Hz, sampling time of 50 μ sec and 20 μ sec. The harmonic frequency shows 4 Hz, 8 Hz, 12 Hz and 16 Hz reflected from an unirradiated specimen. On the contrary, the harmonic frequency disappeared on the irradiated specimen. In addition to the amplitude, the harmonic frequency of Barkhausen noise is taken into accounts as a promising tool for monitoring the irradiation induced degradation of the reactor materials such as a SA508 of PWR-RPV steel and a Zr₄ of HANARO-CNH.
Chang Ho Moon,Kang-Soo Han,Minwook Kim,Dong Kyo Oh,Sol Yi,Taehyun Kim,Hongkyu Kim,Jaehyun Hwang,Jung Gun Nam,Dong-Eon Lee,Dae-Young Lee,Gug Rae Jo,Jong G. Ok 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.1
While roll-to-roll nanoimprint lithography (R2R NIL) can be capitalized in highly scalable fabrication of nanopatterns, preparation of large-area flexible molds remains the main challenge. In this work, we demonstrate that tiling of small-area nanopatterns in a slightly overlapped fashion can provide a practical solution to it; sequentially performing the UV NIL processes onto self-replicable UV-curable resin drops by using a small tile mold can create largearea-tiled molds. We systematically investigated that controlling the tile NIL force and several parameters is crucial to minimize the seams between tiles. We also present that the R2R NIL system can be improved by integrating a linear UV LED module for prompt UV curing before the as-imprinted nanopattern reflows, which is critical for high-resolution, high-quality nanopatterning. By using the tiled mold containing 45 nm-half-pitch nanogratings and operating the UV LED-integrated R2R NIL system, we exemplify that sub 50 nm-resolution nanopatterns can be faithfully created.
Vibrio areninigrae sp. nov., a marine bacterium isolated from black sand.
Chang, Ho-Won,Roh, Seong Woon,Kim, Kyoung-Ho,Nam, Young-Do,Jeon, Che Ok,Oh, Hee-Mock,Bae, Jin-Woo Society for General Microbiology 2008 International journal of systematic and evolutiona Vol.58 No.8
<P>A Gram-negative, facultatively anaerobic, motile, slightly curved rod-shaped bacterial strain was isolated from black sand collected from Soesoggak, Jeju island, Korea. The strain, designated J74T, was able to grow in the presence of 1-7.5 % NaCl, at temperatures of 4-45 degrees C and at pH 5-10. Strain J74T was oxidase- and catalase-positive, arginine dihydrolase-negative and sensitive to the vibriostatic agent O/129. Strain J74T was characterized based on physiology, morphology, biochemical features and 16S rRNA gene sequence analysis. The isolate required sodium ions for growth and utilized a wide range of compounds as sole sources of carbon and energy. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain J74T belongs to the class Gammaproteobacteria. It was found to be associated with the genus Vibrio and was phylogenetically related most closely to the type strain of Vibrio hispanicus (98.7 % 16S rRNA gene sequence similarity). However, DNA-DNA hybridization experiments between strain J74T and V. hispanicus KCTC 12827T revealed a level of relatedness of 37.7 %. Thus, phenotypic and phylogenetic data suggested that J74T should be placed in the genus Vibrio as representing a novel species, for which the name Vibrio areninigrae sp. nov. is proposed. The type strain is J74T (=KCTC 22122T =JCM 14949T).</P>
Nam, Uk-Won,Lim, Chang Hwy,Lee, Jae Jin,Pyo, Jeonghyun,Moon, Bong-Kon,Lee, Dae-Hee,Park, Youngsik,Kim, Hyun Ok,Moon, Myungkook,Kim, Sunghwan 한국우주과학회 2013 Journal of Astronomy and Space Sciences Vol.30 No.2
Tissue equivalent proportional counter (TEPC) can measure the Linear Energy Transfer (LET) spectrum and calculate the equivalent dose for the complicated radiation field in space. In this paper, we developed and characterized a TEPC for radiation monitoring in International Space Station (ISS). The prototype TEPC which can simulate a 2 μm of the site diameter for micro-dosimetry has been tested with a standard alpha source (241Am, 5.5 MeV). Also, the calibration of the TEPC was performed by the 252Cf neutron standard source in Korea Research Institute of Standards and Science (KRISS). The determined calibration factor was kf = 3.59x10-7 mSv/R.
Chang, Ziwei,Lu, Ming,Ma, Yunqi,Kwag, Dong-Geon,Kim, Seo-Hyun,Park, Ji-Min,Nam, Bo-Hye,Kim, Young-Ok,An, Cheul-Min,Li, Huayue,Jung, Jee H,Park, Jang-Su Springer-Verlag ; Springer 2015 Amino acids Vol.47 No.3
<P>Recombinant expression in Escherichia coli allows the simple, economical, and effective production of bioactive peptides. On the other hand, the production of native peptides, particularly those rich in disulfide bonds, is a major problem. Previous studies have reported that the use of carrier proteins for fusion expression can result in good peptide yields, but few are folded correctly. In this study, two transmembrane small proteins in E. coli, YoaJ and YkgR, which both orientate with their N-termini in cytoplasm and their C-termini in periplasm, were used for fusion expression. The recombinant production of two peptides, asteropsin A (ASPA) and 관-defensin (BD), was induced in the periplasm of E. coli using a selected carrier protein. Both peptides were expressed at high levels, at yields of approximately 5-10 mg/L of culture. Mass spectrometry showed that the resulting peptide had the same molecular weight as their natural forms. After purification, single peaks were observed by reversed phase high-performance liquid chromatography (RP-HPLC), demonstrating the absence of isoforms. Furthermore, cytoplasmically expressed fusion proteins with a carrier at their C-termini did not contain disulfide bonds. This study provides new carrier proteins for fusion expression of disulfide bond-rich peptides in E. coli.</P>