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WO_3/SiO_2, MoO_3/SiO_2 觸媒들의 擔體酸處理 特性에 관한 硏究
沈敬淑,丁碩鎭 慶熙大學校 1986 論文集 Vol.15 No.-
The surface characteristics of the differently loaded WO_3/SiO_2 and MoO_3/SiO_2 catalysts which were prepared with special support acid-treatment procedures were examined using the N_2 adsorption at-195℃ and NH_3 adsorption at 165℃ each. For the N_2 adsorption, conventional gas volumetric adsorption apparatus, and for the NH_3 adsorption differential scanning calorimentry(DSC) were used. The total surface area per unit weight of support was constant for WO_3/SiO_2 catalyst against the extent of metal loading, but decreased for MoO_3/SiO_2 catalyst. It may be suggested that the formation of surface compound of tungsten oxides on the support surface constitutes the monolayer and the interaction between the support and active metal is more sensitive on MoO_3/SiO_2 than on WO_3/SiO_2. In the acid treatment the acidities of 10 wt% WO_3/SiO_2 and 10 wt% MoO_3/SiO_2 were 6.3 and 30.3 respectively, but those of the acid treated catalyst were 6.6-9.7 and 22-23. The optinum conditions of acid treatment in WO_3/SiO_2 catalyst were found that using the maximum concentration of treatment solution in the range 2-8 N-HCl and that using the shortest treatment time in range 3-8 hr, and die lowest treatment temperature in the range 50-90℃.
보육시설을 이용하는 학부모와 보육교사의 바람직한 역할 연구
김진선,심경숙,김현숙 전국사회복지학회 2018 전국사회복지연구 Vol.12 No.-
본 연구는 보육시설을 이용하는 학부모와 보육교사의 바람직한 역할을 살펴보기 위한 연구로서, 학부모는 영유아를 보호하고 양육에 대한 책임을 지고 있으므로 자녀에게 사회화의 기초를 잘 형성해 주기 위한 밀접한 상호작용을 하는 양육방식이 필요하며, 바람직한 교사상으로는 자기계발을 위해 꾸준히 노력하고, 전문적인 지식을 토대로 영유아의 개인별 능력을 최대한으로 향상 시킬 수 있는 역할을 하는 것이다. This study aims to examine the desirable roles of parents and child care teachers using day child care facilities. As parents are responsible for protecting and nurturing infants, parents need a parenting style to have close interaction that forms the foundation of socialization. A desirable teacher, based on professional knowledge, continues to strive for self-development and assists in improving infant’s individual ability to the fullest.