• Title/Summary/Keyword: Electron-beam irradiation

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Effect of Electron Irradiation on the Surface Hardness and Wear Characteristic of CrAlN Thin Film Deposited on the SKD61 Mold Steel (전자빔 조사에 따른 CrAlN/SKD61의 표면경도 및 내마모도 개선효과)

  • Eom, Tae-Young;Song, Young-Hwan;Choi, Su-Hyun;Choi, Jin-Young;Heo, Sung-Bo;Kim, Jun-Ho;Kim, Daeil
    • Journal of the Korean Society for Heat Treatment
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    • v.30 no.4
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    • pp.164-168
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    • 2017
  • Intense electron beam was irradiated on the CrAlN thin films deposited in SKD61 under different incident energies and then the effect of electron beam irradiation on the enhancement of surface hardness and wear resistance was investigated. Surface hardness and wear resistance of the CrAlN films is increased proportionally with the electron beam energy. While the surface hardness of as deposited CrAlN film is Hv ($0.1g{\cdot}f$) 450, the hardness oflectron irradiated (600 eV) film is Hv ($0.1g{\cdot}f$) 2050. The width of wear track of the untreated SKD61 is $X\_{\mu}m$, while the track-width of the electron irradiated CrAlN (600 eV) film is $787{\mu}m$, respectively. From the observed results, it is supposed that the optimal electron beam irradiation can be one of the useful surface treatment technologies for the enhancement of surface hardness and wear resistance of CrAlN/SKD61, simultaneously.

Comparison of Quality of Bologna Sausage Manufactured by Electron Beam or X-Ray Irradiated Ground Pork

  • Shin, Mee-Hye;Lee, Ju-Woon;Yoon, Young-Min;Kim, Jong Heon;Moon, Byeong-Geum;Kim, Jae-Hun;Song, Beom-Suk
    • Food Science of Animal Resources
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    • v.34 no.4
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    • pp.464-471
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    • 2014
  • Ground lean pork was irradiated by an electron beam or X-rays to compare the effects of two types of radiation generated by a linear accelerator on the quality of Bologna sausage as a model meat product. Raw ground lean pork was vacuum packaged at a thickness of 1.5 cm and irradiated at doses of 2, 4, 6, 8, or 10 kGy by an electron beam (2.5 MeV) or X-rays (5 MeV). Solubility of myofibrillar proteins, bacterial counts, and thiobarbituric acid reactive substance (TBARS) values were determined for raw meat samples. Bologna sausage was manufactured using the irradiated lean pork, and total bacterial counts, TBARS values, and quality properties (color differences, cooking yield, texture, and palatability) were determined. Irradiation increased the solubility of myofibrillar proteins in a dose-dependent manner (p<0.05). Bacterial contamination of the raw meat was reduced as the absorbed dose increased, and the reduction was the same for both radiation types. Differences were observed only between irradiated and non-irradiated samples (p<0.05). X-ray irradiation may serve as an alternative to gamma irradiation and electron beam irradiation.

Effect of Electron Beam Irradiation on the Microbial Safety and Qualities of Sliced Dried Squid (전자선 조사가 건조 오징어의 미생물학적 안정성 및 품질에 미치는 영향)

  • Ko, Jong-kwan;Ma, Yu-hyun;Song, Kyung-Bin
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.34 no.3
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    • pp.433-437
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    • 2005
  • Electron beam irradiation was applied to examine the microbial safety and qualities of sliced dried squid. Sliced dried squid was irradiated at dose of 2, 4, 8, 12, and 16 kGy. Microorganisms contaminated in sliced dried squid were significantly decreased by irradiation. Decimal reduction dose (D/sub 10/ value) of total bacteria count, yeast and mold, coliforms in sliced dried squid were 8.57, 4.60, and 8.10 kGy, respectively. Electron beam irradiation caused negligible changes in Hunter color L, a, and b value. Sensory evaluations of irradiated sliced dried squid showed that there were no significant changes among the samples. These results indicate that electron beam irradiation improves the microbial safety and qualities of sliced dried squid.

Effect of Electron Beam Irradiation on Microbial Qualities of Whole Black Pepper Powder and Commercial Sunsik (전자선 조사가 통후추 분말과 시판 선식의 미생물학적 안전성 및 품질에 미치는 영향)

  • Ko, Jong-Kwan;Ma, Yu-Hyun;Song, Kyung-Bin
    • Korean Journal of Food Science and Technology
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    • v.37 no.2
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    • pp.308-311
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    • 2005
  • Electron beam irradiation was applied to examine microbial safety and qualities of black pepper powder and commercial Sunsik. Whole black pepper powder and commercial Sunsik were irradiated at 2, 4, 8, 12, and 16 kGy. Microorganism contamination in black pepper powder and commercial Sunsik were significantly decreased by irradiation. Decimal reduction doses ($D_{10}\;value$) of total bacteria count in black pepper powder and commercial Sunsik were 5.32 and 1.56 kGy, respectively. $D_{10}\;value$ of yeast and mold were 2.54 and 2.14 kGy for black pepper powder and commercial Sunsik, respectively. Electron beam irradiation caused negligible changes in Hunter color L, a, and b values. Sensory evaluations of black pepper powder and commercial Sunsik showed no significant changes among samples. These results indicate electron beam irradiation improves microbial safety and qualities of black pepper powder and commercial Sunsik.

Fabrication and Characterization of Composite LSCF-Ag Cathode for Solid Oxide Fuel Cells using Electron Beam Irradiation Process

  • Kang, Hyun Suk;Jung, Yung-Min;Song, Rak-Hyun;Peck, Dong-Hyun;Park, ChangMoon;Lee, Byung Cheol
    • Bulletin of the Korean Chemical Society
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    • v.35 no.10
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    • pp.2969-2973
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    • 2014
  • A new process to fabricate a composite LSCF-Ag cathode material for SOFCs by electron beam (e-beam) irradiation process has been suggested for operation under intermediate temperature range of $600-700^{\circ}C$. A composite LSCF-Ag cathode with uniformly coated Ag nanoparticles on the surface of the LSCF material was prepared by a facile e-beam irradiation method at room temperature. The morphology of the composite LSCF-Ag material was analyzed using a TEM, FE-SEM, and EDS. The prepared composite LSCF-Ag material can play a significant role in increasing the electro-catalytic activities and reducing the operating temperature of SOFCs. The performance of a tubular single cell prepared using the composite LSCF-Ag cathode, YSZ electrolyte and a Ni/YSZ anode was evaluated at reduced operating temperature of $600-700^{\circ}C$. The micro-structure and chemical composition of the single cell were investigated using a FE-SEM and EDS.

Atomically sculptured heart in oxide film using convergent electron beam

  • Gwangyeob Lee;Seung-Hyub Baek;Hye Jung Chang
    • Applied Microscopy
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    • v.51
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    • pp.1.1-1.2
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    • 2021
  • We demonstrate a fabrication of an atomically controlled single-crystal heart-shaped nanostructure using a convergent electron beam in a scanning transmission electron microscope. The delicately controlled e-beam enable epitaxial crystallization of perovskite oxide LaAlO3 grown out of the relative conductive interface (i.e. 2 dimensional electron gas) between amorphous LaAlO3/crystalline SrTiO3.

Effects of Electron-Beam Irradiation on Lipid Stability of Ginseng (Electron Beam 조사가 인삼분말의 지방질 안정성에 미치는 영향)

  • Lee, Mi-Kyung;Choi, Kang-Ju;Kim, Jeong-Sook;Kwon, Joong-Ho
    • Journal of Ginseng Research
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    • v.29 no.1
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    • pp.49-54
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    • 2005
  • Electron beam (EB), electrically produced from an electron accelerator, was compared with gamma ray (GR) in terms of its influence at doses from 0 to 15 kGy on the lipid stability of white and red ginseng powders. Irradiation (EB or GR) less than 10 kGy showed negligible effects on the composition of fatty acids in white and red ginseng powders. The thiobarbituric acid (TBA) value, however, increased with irradiation doses and storage time in both samples, which was more significant in red ginseng than white ginseng. Red ginseng revealed higher electron donating ability than white ginseng, even though there was insignificant difference between non-irradiated and irradiated samples irrespective of the post-irradiation storage for 4 months under room temperature as well as energy sources applied.

Size-homogeneous gold nanoparticle decorated on graphene via MeV electron beam irradiation

  • Kim, Yoo-Seok;Song, Woo-Seok;Jeon, Cheol-Ho;Kim, Sung-Hwan;Park, Chong-Yun
    • Proceedings of the Korean Vacuum Society Conference
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    • 2011.02a
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    • pp.487-487
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    • 2011
  • Recently graphene has emerged as a fascinating 2D system in condensed-matter physics as well as a new material for the development of nanotechnology. The unusual electronic band structure of graphene allows it to exhibit a strong ambipolar electric field effect with high mobility. These properties lead to the possibility of its application in high-performance transparent conducting films (TCFs). Compared to indium tin oxide (ITO) electrodes, which have a typical sheet resistance of ${\sim}60{\Omega}$/sq and ~85 % transmittance in the visible range (400?900 nm), the CVD-grown graphene electrodes have a higher/flatter transmittance in the visible to IR region and are more robust under bending. Nevertheless, the lowest sheet resistance of the currently available CVD graphene electrodes is higher than that of ITO. Here, we report an ingenious strategy, irradiation of MeV electron beam (e-beam) at room temperature under ambient condition, for obtaining size-homogeneous gold nanoparticle decorated on graphene. The nano-particlization promoted by MeV e-beam irradiation was investigated by transmission electron microscopy, electron energy loss spectroscopy elemental mapping, and energy dispersive X-ray spectroscopy. These results clearly revealed that gold nanoparticle with 10 ~ 15 nm in mean size were decorated along the surface of the graphene after 1.5 MeV-e-beam irradiation. A chemical transformation and charge transfer for the metal gold nanoparticle were systematically explored by X-ray photoelectron spectroscopy and Raman spectroscopy. This approach advances the numerous applications of graphene films as transparent conducting electrodes.

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Control of Botrytis cinerea and Postharvest Quality of Cut Roses by Electron Beam Irradiation (전자빔 조사에 따른 잿빛곰팡이병원균 방제효과와 절화 장미의 수확 후 품질)

  • Kwon, Song;Choi, Gyung Ja;Kim, Ki Sun;Kwon, Hye Jin
    • Horticultural Science & Technology
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    • v.32 no.4
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    • pp.507-516
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    • 2014
  • The present study was conducted to determine the effect of electron beam irradiation on control of Botrytis cinerea and postharvest quality of cut roses. Electron beam doses of 0.1, 0.2, 0.4, 0.6, 0.8, 1, 2, 10, and 20 kGy were applied with a 10-MeV linear electron beam accelerator (EB Tech, Korea). Electron beams inhibited spore germination and mycelial growth of B. cinerea with increasing irradiation doses. Conidia of B. cinerea were more tolerant to irradiation than were mycelia: the effective irradiation doses for 50% inhibition ($ED_{50}$) of spore germination and mycelial growth were 2.02 kGy and 0.89 kGy, respectively. In addition, electron beam irradiation was more effective in reducing mycelial growth of B. cinerea at $10^{\circ}C$ than at $20^{\circ}C$. Analysis of in vivo antifungal activity revealed that elevated irradiation doses exhibited increased control efficacy for tomato gray mold. Flower longevity and fresh weight of cut roses decreased when the irradiation dose was increased. In addition, flower bud opening tended to be inhibited in a dose-dependent manner. Although 'Decoration', 'Il se Bronze', 'Queen Bee', and 'Revue' roses tolerated and maintained overall postharvest quality up to 0.4 kGy, 'Vivian' did not, demonstrating that the irradiation sensitivity of cut roses varies according to cultivar.

Study about Conversion Efficiency of c-Si Solar Cells Using Low energy(40keV) Electron Beam (40keV 저에너지 전자빔을 이용한 단결정 Si 태양전지의 변환 효율에 관한 연구)

  • Yoon J.P.;Kang B.B.;Park S.J.;Yoon P.H.;Cha I.S.
    • Proceedings of the KIPE Conference
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    • 2003.07b
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    • pp.942-948
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    • 2003
  • This paper about the small electron beam irradiator for solar cell's efficiency. Many things are studied by method to increase conversion efficiency of solar cell. We selected electron beam by method for conversion efficiency of solar cell. Energy bands of this electron beam irradiator is 80keV(max.). And, solar cells that apply in this paper are crystal Si. Average efficiency of solar cell that applies in this experiment is 10$\%$. This system manufactured low energy electron beam irradiator. And, electron beam irradiation to solar cell in vacuum chamber of this irradiator. Irradiation area is 20*20 [mm2] by 40[keV].

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