著者

Kiuchi Kenta Kyutoku Koutarou Sekiguchi Yuichiro Shibata Masaru Wada Tomohide

出版者

American Physical Society

雑誌

Physical Review D (ISSN:15507998)

巻号頁・発行日

vol.90, no.4, 2014-08-28

被引用文献数

166

---

連星中性子星の合体とブラックホールの進化過程に新解釈 -スーパーコンピュータ「京」で磁場の増幅機構が明らかに-. 京都大学プレスリリース. 2014-09-01.We perform high-resolution magnetohydrodynamics simulations of binary neutron star mergers in numerical relativity on the Japanese supercomputer K. The neutron stars and merger remnants are covered by a grid spacing of 70 m, which yields the highest-resolution results among those derived so far. By an in-depth resolution study, we clarify several amplification mechanisms of magnetic fields during the binary neutron star merger for the first time. First, the Kelvin-Helmholtz instability developed in the shear layer at the onset of the merger significantly amplifies the magnetic fields. A hypermassive neutron star (HMNS) formed after the merger is then subject to the nonaxisymmetric magnetorotational instability, which amplifies the magnetic field in the HMNS. These two amplification mechanisms cannot be found with insufficient-resolution runs. We also show that the HMNS eventually collapses to a black hole surrounded by an accretion torus which is strongly magnetized at birth.

著者

SHIBATA Masaru

出版者

International Association of Ecotechnology Research

雑誌

Journal of Ecotechnology Research (ISSN:18819982)

巻号頁・発行日

vol.12, no.3, pp.189-192, 2006

---

The distribution of chlorophyll intermediates in the rice mutant plants M249 and M134 that accumulate chlorophyllides <I>a</I> and <I>b</I> esterified with incompletely reduced alcohols, such as geranylgeraniol, dihydrogeranylgeraniol and tetrahydrogeranylgeraniol, were determined in five chlorophyll-protein complexes and free pigment resolved by non-denaturing polyacrylamide gel electrophoresis. The <I>a</I>/<I>b</I> ratios of chlorophyll intermediates in mutant thylakoids were similar regardless of reduction state of chlorophyll moieties. In light harvesting complexes and photosystem II core proteins of the rice mutants, the proportions of the intermediates in total chlorophylls were nearly constant. However, the proportions of chlorophyll-geranylgeraniol in P700-chlorophyll <I>a</I>-protein complexes of mutants were clearly lower than those in photosystem II core and antenna complexes. These results suggest that chlorophylls with less-reduced side chain are unlikely to be incorporated into photosystem I core protein complex, and that other photosynthetic protein complexes, such as P680-chlorophyll <I>a</I>-protein complex and light harvesting complexes, are independent of reduction state of the side chain.

著者

Kiuchi Kenta Kyutoku Koutarou Sekiguchi Yuichiro Shibata Masaru Wada Tomohide

出版者

American Physical Society

雑誌

Physical Review D (ISSN:15507998)

巻号頁・発行日

vol.90, no.4, 2014-08-28

被引用文献数

166

---

連星中性子星の合体とブラックホールの進化過程に新解釈 -スーパーコンピュータ「京」で磁場の増幅機構が明らかに-. 京都大学プレスリリース. 2014-09-01.