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Nd:YAG 레이저를 이용한 수중 부식생성물 검출기술에 관한 연구
문전수(J. S. Moon),이상국(S. K. Lee),윤석원(S. W. Yoon) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
A real-time monitoring technology for colloidal iron oxide in boiler water was studied by applying LIBD (Laser Induced Breakdown Detection) and acoustic emission measurement. A Q-switched Nd:YAG laser, which delivers the pulsed laser of wavelength 532 nm, repetition rate 10 Hz and energy 60 mJ. The laser pulse energy for LIBD of corrosion products was maintained to be at approximately 0.6 mJ less than that for LIBD of deionized pure water. The acoustic emission signals resulting from breakdown events were measured by a piezo electric tranducer (PZT) attached to on the side wall of sample flow cell. The quantity analysis of corrosion products in water was achieved based on the breakdown probability of the induced laser pulse events. As accuracy test results of on-line corrosion products monitor, the standard deviation of 8 to 10% could be obtained within the range of 0.25 to 2.0 ppm as Fe.
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윤석원,B. J. Suh,D.-Y. Jung,S. Yoon,W. S. Jeon,Y. J. Kim 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.2
We present magnetization measurements for a single crystal of Mn12 acetate. The effects of a transverse magnetic feld Hx on the magnetization relaxation were investigated by measuring the angle dependence of the magnetization relaxation. The effect of Hx on thermally activated relaxation of the magnetization is well explained by a classical reduction of the energy barrier. By introducingan effective transverse anisotropy E, we could also explain quantitatively the dependence on Hx of the relaxation associated with resonant spin tunneling. We present magnetization measurements for a single crystal of Mn12 acetate. The effects of a transverse magnetic feld Hx on the magnetization relaxation were investigated by measuring the angle dependence of the magnetization relaxation. The effect of Hx on thermally activated relaxation of the magnetization is well explained by a classical reduction of the energy barrier. By introducingan effective transverse anisotropy E, we could also explain quantitatively the dependence on Hx of the relaxation associated with resonant spin tunneling.
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