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맥주 및 분뇨슬러지 혼합물의 퇴비화에 관한 연구 I -혼합 및 교반주기가 퇴비화에 미치는 영향-
박종혁,김동수 한국자원리싸이클링학회 1999 자원리싸이클링 Vol.8 No.4
Nightsoil and brewery sludges usually contain a high concentration of organic matters. A composting study using reactors was carried out for the recycle of brewery wastewater sludge and nightsoil treatment sludge, which have been landfilled. A good composting process was obtained with a sludge mixing ratio of 1:1 and injual pH had no effect on temperature increase related to microbial activity. The injtial C/N ratio at approximarely 15 decreased to 13 without the increase in pH.. It was found that agitation of one time a week provided the most effective composting process.
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동-스테인리스강 브레이징 접합부의 계면 조직과 접합 강도에 관한 연구
박종혁,이우천,강춘식 대한용접접합학회 1994 대한용접·접합학회지 Vol.12 No.3
In this experiment, to find optimum brazing conditions for Cu/Stainless Steel brazing using filler metals of Ag-Cu-Zn-Cd system, first of all spreading ratio was tested on 304 stainless Steel and low carbon steel. And then shear test of brazed joint was executed. As the result of that, the shear strengths of brazed joints were the range of 60-90 MPa. Through microstructure analysis for brazed interface layer, We found as follows. Firstly interface layer increased as time increased. Secondly continuous layer of Ag-Cd compound was observed along the side of stainless steel. Also by means of EDS analysis for fracture surface, ductile fracture was occurred and precipitates on the fracture surface were found to include Cr, Mn, Si in Ag-rich phase.
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