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半回分式 吸收器에서의 亞黃酸나트륨 水溶液에 依한 酸素가스의 初期吸收에 關한 硏究
朴相郁 부산대학교 공과대학 1985 硏究報告 Vol.30 No.-
An investigation has been carried out to obtain the information of a mechanism of chemical reaction between sodium sulfite solution and oxygen in a semi-batch absorber. The exnerimental results are as followings. 1.The initial rate of oxygen absorption increases with Na₂SO₃ concentration, and shows a maximum value at about 0.4gmol/l beyond which it decreases at constant oxygen pressure, pH and catalyst concentration. 2.The reaction of sodium sulfite with oxygen proceeds with second order of oxygen concentration. 3.The initial rate of absorption of oxygen is proportional to square root of CoSO₄ concentration as catalyst, and to the pH value of Na₂SO₃solution. 4.Film model appears to be useful for explaining the absorption of oxygen under given experimental conditions.
박상욱 인간식물환경학회 2020 인간식물환경학회지 Vol.23 No.3
Background and objective: It is difficult to conclusively determine the exact cause of tree defects since multiple causes are involved such as climate change, plantation, tree quality and planting time, construction, planting base, drainage, sunshine conditions, maintenance, and microclimate. The data related to landscaping construction defects are scattered or fragmented by companies and years, but not managed systematically by the defect information management system. Most of the earlier studies associated with tree defects in apartment complexes suggested defect rates after examining tree defects in the completed construction site and proposed fragmentary and subjective conclusions about the causes of defects observed in trees with high defect rates. It is proposed to continue to conduct studies on the establishment and analysis of systematic databases to identify the exact causes of tree defects and measures to improve, and the need to accumulate systematic data in the construction process where many defects arises. This study was conducted to reduce the defects of trees planted in apartment complexes. Methods: Main factors related to tree defects were subdivided based on the results of literature review and a defect investigation at the completion site, and tree history management items were selected and subdivided during the construction stage. Results: The criteria for the preparation of subdivided items were obtained, and the tree history management checklist was written for the site under actual construction and a systematic database was established. Items that are categorized based to the causes of defects include the location of nurseries, date, tree quality, site conditions, planting techniques, microclimates, and maintenance. Conclusion: This study suggested tree history management items based on the tree defects that can be identified at the construction stage and applied them to the selected study site, which differentiates this study from earlier studies. It will be necessary to conduct a comprehensive and objective time series analysis on tree defects that occur over time by continuously monitoring and collecting data after construction.