心臓マクロファージの分化機構の解析

学位の種別: 課程博士審査委員会委員 : （主査）東京大学教授 小野 稔, 東京大学特任准教授 縄田 寛, 東京大学講師 大門 雅夫, 東京大学講師 荒井 俊也, 東京大学講師 山内 康宏University of Tokyo(東京大学

Effect of irradiation uniformity on quasi-isentropic shock compression of solid spheres

Takizawa R., Sakagami H., Nagatomo H., et al. Effect of irradiation uniformity on quasi-isentropic shock compression of solid spheres. High Energy Density Physics 52, 101124 (2024); https://doi.org/10.1016/j.hedp.2024.101124.In inertial confinement fusion using central ignition, the ignition hot spot is generated through self-heating during fuel compression. In contrast, fast ignition creates the hot spot through external heating. This difference allows the fast ignition approach to use a solid sphere as the fusion fuel shape. The implosion of a solid sphere is one form of laser-direct-drive slow implosion. Solid sphere fuel exhibits tolerance to hydrodynamic instability and can be mass-produced relatively easily, offering significant advantages for developing inertial fusion energy. Achieving high fuel peak and areal densities of with a solid sphere requires quasi-isentropic compression, which involves multiple shock waves. Our results show the critical role of uniform laser irradiation in initiating weak shock waves in the early phase, which is essential for forming a uniform and dense fuel core with solid spheres. Furthermore, dynamically adjusting the laser spot diameter could be crucial in optimizing the effectiveness of laser-direct-drive and fast ignition techniques when using solid sphere fuel

An attempt at automatic composition of Tsume-Shogi (Japanese Chess mating) problems by retrograde analysis

This paper describes our program that composes Tsume-Shogi problems automatically by retrograde analysis. Tsume-shogi is a mating problem of Shogi (Shogi is Japanese chess). Tsume-shogi is a very popular one-person puzzle among Japanese people. A noticeable difference between Shogi and western chess is that in Shogi a player can reuse pieces that he captured from his opponent. Rules of Tsume-Shogi are different from those of western chess mating problems. So methods of automatic composition of Tsume-Shogi problems are different from those of western chess mating problems. Our program consists of four stages: selection of mate position, search for reverse moves, optimization of position, and evaluation of problems. First, many mate positions of Tsume-Shogi problems are generated by a computer. One of them is selected as a candidate. Some pieces are added on the mate position randomly. Second, moves of the attacking side and the defensing side are generated in turn by reverse method. Th..

Post-translational amino acid conversion in photosystem II as a possible origin of photosynthetic oxygen evolution

How photosynthetic oxygen evolution is originated on ancient Earth is unknown. Here, the authors find that some amino acid residues at the ligand sites of the Mn cluster can be posttranslationally converted to the original carboxylate residues, which could have contributed to the evolutionary process of photosynthetic oxygen evolution