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Nd:YAG 레이저의 근적외선과 자외선 펄스를 이용한 NiP 하드디스크 기층의 세척
김동식,Grigoropoulos, C.P. 한국레이저가공학회 2001 한국레이저가공학회지 Vol.4 No.2
This paper introduces a cleaning process for removing submicron-sized particles from NiP hard disk substrates by the liquid-assisted laser cleaning technique. Measurements of cleaning performance and time-resolved optical diagnostics are performed to analyze the physical mechanism of contaminant removal. The results reveal that nanosecond laser pulses are effective for removing the contaminants regardless of the wavelength and that a thermal mechanism involving explosive vaporization of liquid dominates the cleaning process.
김동식,박희권,C.P.Grigoropoulos,최선락 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.6
† 책임저자, 회원, 포항공과대학교 기계공학과E-mail: HYPERLINK "mailto:dskim87@postech.ac.kr" dskim87@postech.ac.krTEL: (054) 279-2179 FAX: (054) 279-3199* IBM, Storage Division, San Jose, USA
Transport phenomena in a steam-methanol reforming microreactor with internal heating
Suh, J.S.,Lee, M.T.,Greif, R.,Grigoropoulos, C.P. Pergamon Press ; Elsevier Science Ltd 2009 International journal of hydrogen energy Vol.34 No.1
An experimental and theoretical study of steam reforming of methanol is carried out in a packed-bed microreactor with internal heating. Experimental results of the methanol conversion and carbon monoxide concentration in an internally heated reformer are compared with those of an externally heated reformer. Higher methanol conversion and carbon monoxide concentration are obtained for internal heating at the same conditions. The results show the conversion efficiency of methanol and CO concentration increase with increasing internal heating rate over the range of operating conditions. A correlation for the conversion efficiency of methanol has been obtained as a function of the internal heating rate and a dimensionless time parameter which represents the ratio of the characteristic time of the methanol flow to the time for chemical reaction.