Sapporo Gakuin University (SGU): Repository / 札幌学院大学学術機関リポジトリ
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造形的な見方・感じ方を働かせ、生き生きと学ぶ鑑賞の授業を目指して ～２学年 「であって 生まれる いろのせかい」の実践と考察から～
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Geological Sketch of the Hadean from oceanic island arc tectonics
Get PDF冥王代は証拠の乏しい時代で，この時期のみに起こった固有の地質事象も，いくつか推定される。そんな特異な時代を，どのように区分し，どのように地質学的に探っていくのかを検討した。月や他の惑星（小惑星帯の天体も含む），隕石，シミュレーションなどの知見を利用して，冥王代に起こったはずの大きな地質事象（地球形成，ジャイアント・インパクト，後期重爆撃）をもとに6 つに区分した。後期重爆撃後の「海洋性島弧期」については，断片的な証拠が存在し，現在の地球にもアナロジーできる地質場（多数の海洋性島弧の形成と構造侵食による消滅）が存在する。そこから，砕屑性ジルコンの欠損と散逸の理由も見いだせてきた。The Hadean Era, which is characterized by a paucity of evidence, is thought to have been a period during which distinctive geological occurrences took place during the Earth was in the process of formation. This paper presents a discussion of the division of the Hadean Era and the exploration of its geology. A division of the Hadean era into six periods was made based on geological events, including the formation of the Earth, a giant impact, and the late heavy bombardment. This was done using data from the Moon and other planets （including objects in the asteroid belt）, meteorites, and computer simulations. The last “oceanic island arc period” is inferred from the evidence of detrital zircon ages and the analogy of modern geological fields （the formation of numerous oceanic island arcs and their extinction by tectonic erosion）. The reasons for the loss of Hadean rocks and the dispersal of the old detrital zircons have been elucidated.Bulletin論文Articlesdepartmental bulletin pape
A Comparison of Flip and Video Assessment Module: A mixed methods study of two speaking practice tools used in an online university language classroom
Get PDFFlip and Video Assessment Module (VAM) were used as face-to-face speaking activity replacements in an on-demand EFL course in the 2024~25 school year. Mixed methods research found that students were generally satisfied with the speaking activities and rated them as better speaking practice than traditional face-to-face speaking activities. Participants noted that their anxiety to speak English decreased. Some stated that they enjoyed the ability to work at their own pace, and by creating videos they could develop a stronger habit of studying and thinking about English.Bulletin論文Articlesdepartmental bulletin pape
The Advocate of the Abductive Uniformitarianism and an Application for the Hadean
Get PDF帰納法，演繹法，仮説演繹法の手法を整理し，それぞれの利点と弱点をまとめた．地質学では，過去の事象を斉一説の考えにて解読している．ところが斉一説は仮説演繹法の一種なので，論理的弱点があり，「アブダクション」の概念の導入が有効である．また，地質学には再帰性のある「時間の環」という事象や，時間の不可逆性を示す「時間の矢」という事象がある．古い時代の事象には，両者を融合した「時間のらせん」という視点が必要なことも示した．「時間のらせん」とみなせる古い時代の事象への「アブダクティブ斉一説」という方法論を提案した．ケーススタディとして，冥王代固有の地質現象を「海洋性島弧テクトニクス」というアブダクティブ斉一説の観点で読み解き，そこから冥王代に見られる年代ギャップの原因を推定した．This paper presents an overview of the fundamental principles of induction, deduction and hypothetico-deductive method, and an analysis of their respective advantages and limitations. In geology, uniformitarianism is employed to elucidate past phenomena. Given that uniformitarianism is a form of hypothetico-deductive methodology, it is susceptible to logical defects. The incorporation of the concept of “abduction” proves an effective solution. Furthermore, geology encompasses recursive events, namely “time’s ring” and “time’s arrow”, and irreversible events, “time’s spiral”. This paper proposed the integration of a fused time’s spiral perspective to elucidate past events. The “time’s spiral” and the “abductive uniformitarianism” facilitated the interpretation of Hadean specific geological events in terms of “oceanic island arc tectonics”.Bulletin自然科学Natural Sciences論文departmental bulletin pape