81690 research outputs found
Sort by
Reprint of "Torikaebaya" (vol. 1) held at Osaka University International Studies Library, part. 1
No full text今、ヴェーバーを読み返すことの意義？
No full text日本基督教学会北海道支部2021年度公開シンポジウム「マックス・ヴェーバーとキリスト教 : マックス・ヴェーバー没後100年（2020年）を記念して」. 2021年8月11日
Evaluation and Analysis of Research Poster Design : Based on Subjective Surveys by Students and Researchers
No full text研究者の中には，学会という科学技術コミュニケーションの場で使用する研究発表用のポスターの作成に苦慮している人もいる．本研究の目的は，見る人の関心を得て，読んで議論してもらえるポスターの実現のために，ポスターの良し悪しを決めるデザイン的な要因を具体的に明らかにすることである．そのために，発表済みの研究ポスターを用いて，他の研究者が評価する主観的なアンケート調査を実施した．さらに，研究者としての経歴の長さが，研究ポスターに対する評価に影響を及ぼすと仮定し，学生グループと大学に勤務する研究者グループとで比較した．その結果，「一見して印象に残った」ポスターの1位は，学生と研究者で同じものを選択したが，「良いと思った」ポスターでは異なるものを選択した．1位に選んだポスターに対して，学生はその配色を，研究者はレイアウトを評価しており，研究のキャリアによって，ポスターの良し悪しを決めるデザイン要素に差異を認めた．他にも，文字領域に対して図領域の比率が1割程度であると評価が低い傾向が見られた．本研究の分析結果をもとに，注力すべきデザイン要素に留意することで，興味を引き，視覚的に理解しやすく，議論しやすい研究ポスター作成に貢献することが期待される．Some researchers struggle to create effective posters for presentation at conferences. The aim of this study is to identify specific design factors that determine poster quality, with the aim of creating posters that are interesting, easy to read and facilitate discussion. To achieve this, a subjective questionnaire was administered to other researchers using previously published posters. In addition, the study hypothesized that the length of a researcherʼs career might influence their evaluation of research posters, and compared responses from student groups and researchers working in universities. The results showed that the highest-rated poster, which considered to be "most memorable at first glance", was chosen equally by both students and researchers. However, the choice of the "best" poster differed between the groups. Students rated the colour scheme of the top poster, whereas researchers rated the layout. This suggests differences in design elements that contribute to poster quality based on research experience. In addition, a tendency towards low ratings was observed when the ratio of figure areas to text areas was around 10%. Based on these findings, it is expected that attention to key design elements can help to create posters that are interesting, visually understandable and encourage discussion
原子炉用CoフリーFCCミディアムエントロピー合金の照射下における微細組織変化と機械的特性に及ぼすヘリウムと水素の影響
No full textThe research and development of advanced nuclear power systems are critically important for the commercialization of next generation nuclear reactors. New structural materials with high corrosion and irradiation resistance are urgently required for extended use at high temperatures and high doses. In recent years, medium and/or high-entropy alloys (M/HEAs) have garnered significant attention due to their attractive mechanical properties. The high strength, ductility, and corrosion resistance make HEAs potential candidates for structural applications in high temperature fission or fusion reactors. Heavy ion irradiation has been intensively used to investigate the irradiation effects on HEAs including swelling, hardening, and phase stability. However, one of particular concern is the simultaneous production of helium and hydrogen that have a strong impact on the microstructure evolution of irradiated materials. Typically, they may cause additional swelling and embrittlement of materials. In this study, the performance of four different Cr-Fe-Mn-Ni HEAs under irradiation, including He and H effect on the microstructure evolution and mechanical properties, are also investigated.
Firstly, a group of Co-free medium entropy alloys(MEAs): Cr0.65FeMnNi, Cr0.8FeMnNi, Cr0.8FeMn1.3Ni, Cr0.8FeMn1.3Ni1.3 were prepared by arc melting. After annealing at 1100 °C for 48 hours, the samples were cold-rolled, followed by recrystallization at 1000 °C for 4 hours. Electron backscattered diffraction (EBSD), tensile test and nano-indentation test was conducted to characterize the microstructure and the mechanical properties for each alloy. The elevated Mn content within this alloy induced a high atomic size difference within the material, inducing highest hardness and smallest grain size in Cr0.8FeMn1.3Ni. The high grain boundary strengening and solid solution strengthening result in the high strength of Cr0.8FeMn1.3Ni.
Secondly, in order to understand He injection amount effect on the microstructure evolution in HEAs, Cr0.8FeMnNi and 316L were irradiated with Fe2+ at a temperature of 500 ℃ with different He+ preinjection amount. Transmission electron microscopy was used to characterize the irradiation-induced defects. As He injection amount increased, the binding energy of the self-interstitial atom (SIA) to the He-V complex decreased. This reduction result in the increase of the SIA in the matrix, affecting the evolution of point defects.
Thirdly, Cr0.8FeMnNi and 316L is irradiated with single beam (Fe3+ ), dual beam (Fe3++He+ ) and triple beam (Fe3++He++H + ) at 500 ℃. He and H effect on irradiation induced hardening and swelling on HEAs and 316L is studied. The nanoindentation test showed that MEAs showed higher irradiation hardening resistance than 316L. The microstructure characteration results indicates that under single beam irradiation, large cavities formed in Cr0.8FeMnNi. Small bubbles with high density were found in dual and triple beam irradiated Cr0.8FeMnNi and 316L. He enhanced the nucleation and H can enhanced the growth of bubbles. The interaction bewteen He and vacancy could be weaker in Cr0.8FeMnNi.
This work indicated that Mn content can affect the lattice distortion of MEA, affecting the microstructure and mechanical property. The pre-injected He amount can affect the binding energy of SIA to He-V cluster. The decrease of the binding energy of SIA to He-V complex can affect the point defect evolution. The bulk irradiation showed that He enhanced the nucleation and H can enhanced the growth of bubbles in MEAs
カテナン型超分子メカノフォアの開発 [全文の要約]
No full textこの博士論文全文の閲覧方法については、以下のサイトをご参照ください。【担当：理学部図書室】https://www.lib.hokudai.ac.jp/dissertations/copy-guides
