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토양수분량과 지하수량변화 측정에 의한 유역증발산량 추정
서승필 ( Seo Soung-pil ),한영민 ( Han Young-min ),김태철 ( Kim Tai-cheol ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
A formula of watershed evapotranspiration by Penman or Thonthwaite or Lowry-Johnson was used to measure its quantity of evapotranspiration until now. These formula were derived for Foreign country and, it is rather difficult to apply the above formulas to the Korean watershed. These measuring methods are merely used to measure the monthly quantities of evapotranspiration. At the research CE of a coefficient of evapotranspiration for a watershed were newly presented, which was utilized for the calculation of Beken's formula in the DAWAST model.
김병수,이재천,서승필 한국자원공학회 2003 한국자원공학회지 Vol.40 No.3
Large amounts of obsolete printed circuit bords(PCBs) containing precious metals have been generated. In the study a smelting reduction process for recovering the precious metals from the obsolete PCBs without using additional collector metals was investigated thermodynamically. The distinction of that is to use copper, tin, and iron contained in the obsolete PCBs as collector metals of the precious metals contained in them. Advantages of the process suggested are simple and economic compared with the conventional processes which could recover the precious metals from the obsolete PCBs using additional collector metals such as copper, nickel, lead, and iron. In each experiment the precious metals of Au and Pd could be recovered up to 93.4 % in Cu-Sn alloy phase. The product Cu-Sn alloy phase contained up to 0.20 wt% for Au and 0.05 wt% for Pd. 전 세계적으로 귀금속을 상당량 함유한 폐인쇄회로기판(PCBs)이 다량 발생되고 있다. 본 연구에서는 폐PCBs중에 함유된 귀금속을 기존 공법과 달리 포집금속을 사용하지 않고 회수하기 위한 새로운 용융환원공법이 제안되었다. 제안된 공법은 폐PCBs중에 함유된 유가금속성분인 Cu, Sn, Fe를 귀금속의 포집금속으로 활용한다는 것이 특징이다. 따라서 제안된 공법은 기존 공법과 비교하여 추가적으로 Cu, Ni, Pb, Fe 같은 포집금속을 사용하지 않음으로써 조업이 간단하고 경제적인 것이 특징이다. 실험결과 폐PCBs중에 함유된 Au와 Pd 모두 93.4 %이상 Cu-Sn 합금상으로 회수되었으며, 회수된 Cu-Sn 합금상에 Au 품위는 는 0.20 wt% 이상, Pd 품위는 0.05wt% 이상으로 농축되었다.
건식법에 의한 폐PCBs와 자동차 폐촉매로부터 동시 귀금속 농축 회수 공정개발
김병수,이재천,서승필 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.6
In the world large amount of used printed circuit boards (PCBs) and spent autocatalysts which contain precious metals have been emitted. However, processes which can recover the precious metals simultaneously from them have not been developed yet. In this study a new process for recovering the precious metals contained in the used PCBs and spent autocatalyst by a pyrometallurgical process simultaneously was developed. The distinguish of that is to use copper, tin, and iron contained in the used PCBs as collector metals of the precious metals contained in the used PCBs and spent autocatalysts. Advantages of the process suggested are simply and economic compared with the previous processes which could recover the precious metals from the used PCBs and spent autocatalysts, respectively. Using the suggested process the precious metals such as Au, Pd, and Pt contained in the used PCBs and spent autocatalyst could be recovered up to 95 % in Cu alloy phase.
Cu-(9-X)Ni-XMn-6Sn 합금의 미세조직과 경도에 미치는 시효의 영향
김창주,박영구,한승전,서승필,이정무 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.12
Decomposition precess of α phage in Cu-(9-X)Ni-XMn-6Sn alloy has been investigated by means of side band observation around (200)_α X-ray diffraction peak, hardness, and microstructural observations. When the specimens are aged below 400℃ after solution treatment, the supersaturated solid solution α' is decomposed by three stages. When the specimens are aged above about 500℃, however, the equilibrium cellular structure consisting of α phase and DO_3 type superlattice forms from the initial stage of transformation without any reactions such as spinodal decomposition and transition of metastable phase. In Cu-8Ni-1Mn-6Sn and Cu-7Ni-2Mn-6Sn alloys, the first stage and the second stage in the decomposition of supersaturated solid solution are occurred at the same time. And all stages are occurred earlier than Cu-9Ni-6Sn alloy.
Cu-6Ni-3Mn-6Sn 합금의 미세조직변화에 미치는 첨가원소의 영향
김창주,박영구,한승전,서승필,이정무 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.6
The physical and mechanical properties of the Cu-6%Ni-3%Mn-6%Sn-0.5%X(Al,Ti,Si)alloys and Cu-6Ni-3Mn-6Sn alloy were strongly dependent on aging condition. The effects of additions of Al, Si and Ti on the mechanical properties and formation of discontinuous precipitate in the alloy have been investigated. In this alloy discontinuous precipitation occurs during aging at 350℃ for 405 min. But addition of Si and Ti in this alloy, discontinuous precipitation occurs much less than the Cu-6Ni-3Mn-6Sn alloy and grain size is decreased. For Cu-6Ni-3Mn-6Sn-X alloy system, spinodal decomposition and transition of metastable phase does not occur but discontinuous precipitation decreased with addition of 0.5% Si, Ti and Al respectively. Also grain size is reduced by addition of 0.5% Si and Ti on Cu-6Ni-3Mn-6Sn alloy because of forming interphase in grain boundary.