著者
黒川 悠索
出版者
特定非営利活動法人量子化学研究協会
雑誌
若手研究(B)
巻号頁・発行日
2014-04-01

本研究では、多粒子の一般化近接条件(GCC)を提案した。GCCは正確な波動関数がカスプ領域で満たすべき条件であり、高次の微分係数同士の関係式からなる。高次のGCCを満足すれば、カスプ領域において正確な解が得られることを確かめ数値的に実証した。また、Free Complement法を用いて、無限遠領域においても正しい振る舞いをする基底・励起状態における水素分子のポテンシャルカーブを超精密(原子単位で小数点以下5桁程度)に求めた。
著者
横谷 明徳 黒川 悠索 鵜飼 正敏
出版者
国立研究開発法人量子科学技術研究開発機構
雑誌
基盤研究(B)
巻号頁・発行日
2020-04-01

突然変異等など放射線による遺伝的変異の主要な要因であるDNAの分子損傷のメカニズムを、物理化学的観点から解明する。このため、DNAの電子状態に焦点を当て、ミクロな世界を支配する量子的性質と分子損傷の相関を実験と理論の両面から探る。特にハロゲンなど重い元素をDNAに取り込ませた生体に現れる高い放射線感受性のメカニズムを解明し、量子的観点から放射線増感剤の効果を制御するための技術開発に資する知見を得る。
著者
河合 亮悟 黒川 悠 入江 庸介 井上 裕嗣
出版者
一般社団法人 日本機械学会
雑誌
日本機械学会論文集 (ISSN:21879761)
巻号頁・発行日
vol.84, no.858, pp.17-00462-17-00462, 2018 (Released:2018-02-25)
参考文献数
20
被引用文献数
3

The technique of rapid evaluation of fatigue limit using infrared thermography has been paid attention during the past 30 years. This technique is beneficial because it also makes possible to detect the location of fatigue damage in real structures. In this technique, the second harmonic of temperature variation during cyclic loading is often used as a measure of the temperature evolution to evaluate the fatigue limit. The source of the second harmonic has been already investigated quantitatively for the load amplitude above the fatigue limit but has not been investigated very well for the load amplitude below the fatigue limit. In this research, five factors (second harmonic caused by energy dissipation, applied load signal, photoelectric current of infrared sensor, quantization error and specimen movement) were examined quantitatively to examine the source of the second harmonic below the fatigue limit. Experiments were conducted for double edge notched specimens of type 304 stainless steel. As a result, it was found that the second harmonic of temperature variation below the fatigue limit is mainly caused by loading equipment. In conclusion, it is suggested that the fatigue limit should be evaluated by fitting curves considering the second harmonic proportional to the square of the load amplitude.
著者
天野 歩 阪口 基己 黒川 悠 岡嶋 芳史 井上 裕嗣
出版者
一般社団法人 日本機械学会
雑誌
日本機械学会論文集 (ISSN:21879761)
巻号頁・発行日
vol.83, no.856, pp.17-00377-17-00377, 2017 (Released:2017-12-25)
参考文献数
28

In order to investigate the fundamental process of residual stress development in thermal barrier coating during thermal spray, a model experiment was conducted using a paraffin wax. Melted paraffin wax was dropped onto a circular substrate of type 430 stainless steel, and strain and temperature were measured on the back surface of substrate. The model experiment revealed that tensile quenching strain was developed during solidification and adhesion process and it was increased with the number of droplets. Development of the quenching strain and failure of paraffin coating were significantly influenced by substrate temperature. The lower substrate temperature caused the larger quenching strain, and facilitated cracking, delamination and debonding of the coating. Findings in a series of the model experiments showed some similarities to actual phenomena during thermal spray, and will provide a helpful suggestion to optimize various process parameters in thermal spray.