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졸 - 겔법에 의한 헥사알루미네이트의 제조 및 연소특성
백영순,박성욱,김형진,문세기 ( Y . S . Baek,S . W . Park,H . J . Kim,S . K . Moon ) 한국공업화학회 1995 공업화학 Vol.6 No.6
금속 알콕사이드법에 의해 복합 알콕사이드를 합성하고, sol-gel 법으로 가수분해 반응시켜 얻은 전구체를 소성하여 내열성 바륨 헥사알루미네이트 담체를 만들었다. 복합 알콕사이드 합성시 알코올의 종류 및 양, 반응시간을 변화시켜 barium hexaaluminate 전구체물성에 미치는 영향을 관찰하였으며, 이 담체에 활성 물질인 전이금속(Mn, La)을 치환시켜 BaMnAl_(11)O_(19)과 Sr_(0.8)La_(0.2)MnAl_(11)O_(19) 촉매를 만들었다. 담체의 비표면적은 소성온도 1300℃에서 약 24㎡/g의 높은 값을 나타냈으며, 메탄 연소에 대한 활성화 에너지는 BaMnAl_(11)O_(19) 촉매의 경우 약 11㎉/mole, Sr_(0.8)La_(0.2)MnAl_(11)O_(19) 촉매의 경우 약 9㎉/mole을 나타냈다. 이를 사용하여 중·고온용 연소기의 운전범위에서 공간속도와 공연비를 변화시키면서 메탄 연소특성을 수행하였다. Complex alkoxides were synthesized using metal alkoxide method and were then hydrolyzed to make the precursors using sol-gel method. Factors such as kinds and amounts of alcohols and reaction time which govern the material properties of the barium hexaaluminate precursors were studied. The heat resistant barium hexaaluminate were prepared after the calcination of the precursors. BaMnAl_(11)O_(19) and Sr_(0.8)La_(0.2)MnAl_(11)O_(19) catalysts were finally yielded by the introduction of active transition metals (Mn, La) into the metals(Ba, Sr) hexaaluminate by substitution. The surface area of the hexaaluminate support was about 24㎡/g at 1300℃ and the activation energy for methane combustion was 11㎉/㏖ for BaMnAl_(11)O_(19) and 9㎉/㏖ for Sr_(0.8)La_(0.2)MnAl_(11)O_(19). Based on these catalysts, the characteristics of methane combustion were studied as functions of space velocity and air/fuel ratios in the operational range of mid/high temperature combustors.
장애를 가진 형제를 둔 비장애학생의 회복탄력성과 스트레스 및 스트레스 대처방식과의 관계
백영순,박순길 학습자중심교과교육학회 2023 학습자중심교과교육연구 Vol.23 No.24
Objectives This study aimed to explore the resilience, stress, and stress coping strategies of non-disabled students who have siblings with disabilities. The study also investigated the differences based on gender and school grade, as well as the correlations between these variables. Methods A survey was conducted with 89 non-disabled students who have siblings with disabilities from 8 private developmental rehabilitation centers in Gwangju, Jeonnam, and Jeonbuk. Descriptive statistics, one-way ANOVA, and correlation analysis were used to analyze the data. Results First, there was no significant difference in resilience and stress coping strategies for non-disabled students with siblings with disabilities; however, stress levels were higher among female students compared to male students. Second, as school grade increased, resilience also increased, while stress coping strategies decreased. Third, resilience showed a negative correlation with stress and a positive correlation with stress coping strategies. Conclusions Based on these findings, it is suggested that support programs are needed to enhance the resilience and stress coping strategies of non-disabled students who have siblings with disabilities, and to improve the quality of life for both the disabled siblings and the non-disabled students.
백영순,김형진 한국결정성장학회 1995 韓國結晶成長學會誌 Vol.5 No.2
금속 알콕사이드법에 의해 복합 알콕사이드를 합성하고, 이를 sol - gel법으로 가수분해 반응시켜 얻은 전구체를 소성하여 barium hexaaluminate를 제조하였다. 복합 알콕사이드 합성시 알코올의 종류 및 양, 반응시간을 변화시켜 barium hexaaluminate 전구체 물성에 미치는 영향을 관찰하였으며, 가수 분해시 물의 양 및 반응온도, 그리고 숙성시간에 따른 barium hexaaluminate의 비표면적과 입자크기에 미치는 영향을 알아보았다. Complex alkoxides were synthesized using metal alkoxide method and were then hydrolyzed to prepare the precursors using sol - gel method. Then, the precursors were calcined in order to make barium hexaaluminate. Factors affecting the material properties of the barium hexaaluminate precursors were studied and they are the kinds and amount of alcohols, and reaction time. In addition, in the course of hydrolysis, the effects of the amount of water, reaction temperature and aging time were also studied in terms of the specific surface area and average particle size of the barium hexaaluminates.