日本近世における儒者の登場と定着

京都大学新制・課程博士博士(文学)甲第25730号文博第970号京都大学大学院文学研究科歴史文化学専攻(主査)准教授 三宅 正浩, 教授 谷川 穣, 准教授 本庄 総子学位規則第4条第1項該当Doctor of LettersKyoto UniversityDGA

宇佐美文理教授業績目録

宇佐美文理教授退職記念論

Computational exploration and experimental validation of reduced- multi-principal element alloys with stable BCC phases and superior mechanical properties

Structural materials for fusion reactors must possess exceptional mechanical strength to withstand extreme high-temperature and irradiation conditions. Multi-principal element alloys (MPEAs) have emerged as promising candidates due to their exceptional irradiation resistance and high-temperature mechanical properties. The reduced-activation type MPEAs (RAMPEAs) are particularly noted for mitigating the effects of radioactivation and contributing to the safe operation of fusion reactors and waste management. This study systematically explored the compositional regimes of ternary, quaternary, and quinary RAMPEAs composed of nine low-activation elements. Using a yield strength prediction model, we performed phase diagram calculations and employed the valence electron concentration as a ductility index, screening a total of 625,518 compositions. As a result, 83 promising chemical compositions were identified on the Pareto front based on three objective functions: yield strength at 1000 K, valence electron concentration, and phase stability. Among them, Ti₄₀V₂₀Cr₃₀W₁₀, Ti₄₀V₁₅Fe₁₀Zr₃₅, and Ti₄₀Fe₂₅Zr₃₅ were experimentally evaluated for their predicted superior balance of yield strength, ductility, and phase stability. The computational framework was validated through compression tests and microstructure analysis, achieving a yield strength of 1.39 GPa and a fracture elongation of 16.5 % for Ti₄₀V₂₀Cr₃₀W₁₀ at room temperature, surpassing most RAMPEAs reported in previous studies. This study provides valuable insights into the RAMPEA design and highlights promising chemical compositions for nuclear fusion reactor applications

Ba⁺イオンの²S[1/2]－²D[5/2]時計遷移の単一イオン分光とその奇数同位体のレーザー冷却法

京都大学新制・課程博士博士(工学)甲第26013号工博第5378号京都大学大学院工学研究科電子工学専攻(主査)教授 川上 養一, 特定拠点教授 野田 進, 准教授 杉山 和彦学位規則第4条第1項該当Doctor of Philosophy (Engineering)Kyoto UniversityDFA

Thoracoabdominal Approach for Retroperitoneal Liposarcoma Involving the Diaphragm : A Case Report

An 81-year-old man presented to our hospital with left lower back pain. The computed tomographic scan revealed a retroperitoneal tumor with a heterogeneous contrast effect. Magnetic resonance imaging scan showed that the tumor was suspected to have invaded the left diaphragm, iliopsoas muscle, and pancreas, and an unclear boundary between the tumor and left kidney. Based on these findings, a left retroperitoneal sarcoma or renal carcinoma was suspected. A left retroperitoneal tumor resection, combined with left nephrectomy, was performed. A thoracoabdominal approach was chosen due to suspected diaphragmatic invasion and the need for an adequate operative field on the cephalic side of the kidney. The tumor was resected along with the left kidney, a portion of the diaphragm, and a portion of the iliopsoas muscle, without pancreatic resection. Pathological examination confirmed a dedifferentiated liposarcoma. No intraoperative or postoperative complications were encountered. Surgical resection with a negative surgical margin is crucial for the treatment of retroperitoneal liposarcoma. The thoracoabdominal approach provides excellent surgical exposure and allows for early vascular control. Although the thoracoabdominal approach is rarely used in urological surgery due to concern about the morbidity associated with violating the thoracic cavity, it can be performed effectively and safely for large or invasive retroperitoneal tumors in select cases requiring maximal surgical resection

3-2. Award

Nishikawa Prize (Foundation for High Energy Accelerator Science)/ Quantum Radiation Energy Research Section Heishun Zen (Associate Professor) [107]Outstanding Oral Presentation Award in the EMSES 2025 (16th Eco-Energy and Materials Science and Engineering Symposium)/ Quantum Radiation Energy Research Section Ju Yoon Hnin Bo (D3) [107]JSPF Award for Early Career Research Contributions (Ito Sanae Special Award)/ Complex Plasma Systems Research Section Fumiyoshi Kin (Assistant Professor) [108]Excellent Presentation Award in the 61st National Heat Transfer Symposium of Japane/ Functional Materials Science and Engineering Research Section Akiteru Takahashi (M2) [108]Merit Award in the Global Research Immersion Program for Young Scientists (Grips)/ Functional Materials Science and Engineering Research Section Mioko Kawakami (D2) [109]Young Scientist Poster Award/Nanoscale Horizons Award in the 67ᵗʰ Fullerenes-Nanotubes-Graphene General Symposium/ Functional Materials Science and Engineering Research Section Akiteru Takahashi (M2) [109]Excellent Poster Certificate in the 14th A3 Symposium of Emerging materials: Nanomaterials for Energy and Electronics/ Functional Materials Science and Engineering Research Section Zhirui Liu (D1) [110]Excellent Student Poster Award in the 9ᵗʰ Photonics Workshop/ Functional Materials Science and Engineering Research Section Mioko Kawakami (D2) [110]Symposium Poster Award in the 15th International Symposium of Advanced Energy Science/ Functional Materials Science and Engineering Research Section Mioko Kawakami (D2) [111]Symposium Poster Award in the 15th International Symposium of Advanced Energy Science/ Functional Materials Science and Engineering Research Section Zhirui Liu (D1) [111]Best Poster Award at the 98th Workshop of Materials Tailoring Society/ Chemical Reaction Complex Processes Research Section Hinako Yamamoto (M1) [112]Encouragement Award in the 3rd Kansai Electrochemical Research Association/ Chemical Reaction Complex Processes Research Section Zhengyang Hou (D1) [112]Symposium Poster Award in the 15th International Symposium of Advanced Energy Science/ Chemical Reaction Complex Processes Research Section Wataru Moteki (D3) [113]Excellent Paper Award of The Electrochemical Society of Japan/ Chemical Reaction Complex Processes Research Section Takayuki Yamamoto (Assistant Professor) Toshiyuki Nohira (Professor) [113]Best Poster Presentation Award in the 19th Sympo-sium for Young Scientists of the Japanese Society for Biomaterials at Kansai/ Biofunctional Chemistry Research Section Mashal Asif (M2) [114]Best Poster Presentation Award in the 3rd Sympo-sium for young scientists of “Bottom-up creation of cell-free molecular systems: Surpassing nature”/ Biofunctional Chemistry Research Section Futa Komatsubara (D2) [114]Symposium Poster Award at the 15ᵗʰ International Symposium of Advanced Energy Science/ Structural Energy Bioscience Research Section Tomoki Sakamoto (Researcher) [115

Investment centre manager's multiperiod fairness perceptions and intertemporal dependency

This paper explores the motivation of investment centre managers when their investment centre's performance is affected by decisions made by their predecessor. Through a qualitative case study of a Japanese manufacturer, the effectiveness of conventional remedies for motivational issues and further motivational issues caused by the same remedies, as identified in the extant literature, are examined. The field data underscore managers' multiperiod as opposed to period-by-period fairness perceptions as key to preventing the further motivational issues. This paper also demonstrates the potential usefulness of the vignette technique as a data collection method in qualitative accounting research

Defectless and Uniform Single-Crystallite Dispersions of Sustainable Wood Nanocellulose with a Regulated Right-Handed Twist Periodicity

セルロースナノファイバーの欠陥を減らす --バイオマス由来ナノ材料の用途拡大に向けて-- . 京都大学プレスリリース. 2025-04-08.Controlling the quality of cellulose nanofibers (CNFs), such as dispersibility and defects, is crucial for fully exploiting sustainable wood-derived CNFs. The dispersibility of CNFs is now tailorable, whereas the defects are still uncontrollable. This study is the first to demonstrate defect suppression through the selection of raw material species and the chemical pretreatment for cellulose. Two raw materials of softwood pulp and holocellulose are chosen from the perspective of the nanoscale supramolecular structure of plant celluloses. These two materials are subjected to regioselective surface oxidation using 4-acetamido-2, 2, 6, 6-tetramethylpiperidinyl-1-oxyl as a catalyst at two different pHs to prepare four types of CNFs. Through statistical analysis of the CNF morphology using atomic force microscopy (AFM) image processing, we found a process yielding defectless CNF dispersions comprising uniform single crystallite units of cellulose. Wavelet transform analysis of AFM height profiles further revealed that the defectless CNFs exhibit regulated twist periodicity along much of their length

Genetic purging in an island-endemic pigeon recovering from the brink of extinction

小笠原諸島の絶滅危惧のハト 個体数増加の背景に遺伝的浄化. 京都大学プレスリリース. 2025-08-19.In many endangered species with increased homozygosity, population recovery is limited by expressed deleterious mutations. In contrast, the critically endangered red-headed wood pigeon, endemic to an isolated oceanic archipelago of ~100 km², experienced a dramatic population increase three years after the removal of introduced predators, despite being nearly extinct in the 2000s. To understand the reason for this recovery, we sequenced and analysed its genome. We find that over 80% of the genome is homozygous due to centuries of inbreeding, yet the frequency of highly deleterious mutations is lower than in widespread conspecifics. Linkage disequilibrium-based analysis suggests that the effective population size declined from several thousand to fewer than a hundred in the early 20th century due to human impacts. Gradual inbreeding in a historically small population before human impact may have purged part of the mutation load, facilitating the recovery. Our study highlights the role of historical demography in the persistence of bottlenecked populations, with implications for biological conservation