Springer Science and Business Media LLCActa Medica Okayama1438-49572542023Sequential flotation of 4 components in silicon-based waste solar cells24072416ENMamiMizukawaDepartment of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama UniversityNorikoNishimuraDepartment of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama UniversityMd. AzharUddinDepartment of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama UniversityYoshieiKatoDepartment of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama UniversityYu-ichiUchidaDepartment of Applied Chemistry, Faculty of Fundamental Engineering, Nippon Institute of TechnologySi, Al, Cu, and Ag particles’ mixture which mainly composes pulverized silicon-based waste solar cells were individually separated by the batch flotation experiments with high recovery and content, and then a general flow chart of the sequential flotation procedure of n-component was postulated including 2-, 3-, and 4-components. The n-component mixture was separated to 1: n-1 or i: j (i + j = n) by a flotation procedure and n-1 times operation was necessary to divide into the individual component. The first flotation process to separate Al into the froth layer was carried out with a collector of SDS solution after dipping Si, Al, Cu, and Ag mixture into the SDS solution. Si was separated in the froth by the second flotation with a collector of a commercial neutral detergent after Al etching by HCl, and Si, Cu and Ag mixture dipped in the detergent. The Cu and Ag mixture was calcinated at 673 or 773 K and dipped into the detergent, and the third flotation with the collector of the detergent led to Cu in the froth and Ag in the sediment. The 4-component mixture was successfully separated into each component by the 3-consecutive flotation processes.No potential conflict of interest relevant to this article was reported.Springer Science and Business Media LLCActa Medica Okayama1438-49572522022Flotation kinetics of aluminum powders derived from waste crystalline silicon solar cells and its comparison between batch, continuous and column flotation practices826834ENYoshieiKatoDepartment of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama UniversityShoHaradaDepartment of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama UniversityNorikoNishimuraDepartment of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama UniversityMd. AzharUddinDepartment of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama UniversityYu-ichiUchidaDepartment of Applied Chemistry, Faculty of Fundamental Engineering, Nippon Institute of TechnologyIn this study, floatability rate of aluminum (Al) powders was analyzed for the purpose of separating valuable resources from residual materials in waste photovoltaic (PV) solar cells, and equations for flotation recovery were developed for various flotation types according to the rate-determining steps of the gas flowrate and feed rate. The flotation rate became a zero-order reaction at the rate-determining step of the gas flow rate and had the same form between a batch and continuous typed practices by substituting residence time with real time. Under the rate-determining step of the feed rate, the flotation rate was expressed by the linear combination of the first-order reaction of an even group material. The flotation recovery rate of Al powders was analyzed by the data of a batch floatability experiment and indicated by the linear expression of the first-order reaction of two groups due to the rate-determining step of the feed rate. The calculated separation recovery of n-cell type device increased as the number of cells increased and approached that of the batch and column types.No potential conflict of interest relevant to this article was reported.岡山大学教育学部Acta Medica Okayama0471-40081352007アメリカ合衆国における障害のある子どもの教育権と個別教育計画 -特殊教育関連サービスの提供に関する係争事例の検討-121126ENMunehisaYoshitoshiNorikoNishimuraMitukoMiyoshiRieYokouchiYasukoMasudaSatokoUraikeSachiyoNishi10.18926/bgeou/11178アメリカ合衆国における特殊教育関連サービスの提供をめぐる係争事例を検討し、法制度の実践的応用に伴う課題について明らかにすることを目的とした。とりわけ、個別教育計画(IEP)の記載内容とサービス提供の関係が議論された2つの係争事例をとりあげた。その結果、事例における議論の主な背景要因として、@サービス提供を組織的確立するための学校システムの構築、A共通理解を深めるための関係者における連携の強化が課題となっていた。これらの課題を踏まえ、組織的な管理・支援体制を構成し、子どもに関わる全ての者が適切に情報・理解を共有するための継続的な機会確保の必要性が示唆された。No potential conflict of interest relevant to this article was reported.