Human Beings in Antarctica

Research on Antarctica has been continuing for over a century. While living in Antarctica remains difficult owing to the extreme conditions there, expeditions have progressed greatly in improving accommodations. Expeditioners are exposed to a harsh natural environment such as coldness, dryness, dramatic change in sunshine time, ultraviolet rays, and high altitude. They also live in an extreme condition: closed small groups, absolute isolation, limited equipment and supplies, and no evacuation. As such, expedition members are placed in an extreme physical and mental state. Antarctic doctors are responsible for protecting the health of members who are wintering-over. Statistical analysis of diseases showed that the most common cases were of injuries followed by internal medicine and dental problems. Some diseases were related to environmental factors. Medical operations such as medical screening expedition, remote medical care, and telehealth care contribute to the safety, and better health management systems are themselves subjects of research. Medical researches and operations are advancing and supporting one another. As a simulation of space, the Antarctic experience and the related breakthrough are utilised in space research. Outcomes of research on Antarctica contribute to the better understanding of human society as well

可換なHermann作用の軌道の幾何学的性質

首都大学東京, 2016-03-25, 博士（理学）, 甲第561号首都大学東

Continuum extrapolation of the critical endpoint in 4-flavor QCD with Wilson-Clover fermions

We report our study on the critical endpoint of the finite temperature phase transition in 4-flavor QCD with Wilson-Clover fermions. Using the kurtosis intersection method, we determined the critical endpoint on lattices with $N_t$ = 4, 6 and 8. Our continuum extrapolated results show that the pseudo-scalar meson mass at the critical endpoint, $m_\mathrm{PS,E}$, for 4-flavor is clearly larger than that for 3-flavor. We also compared our results to those with staggered fermions and found that $m_\mathrm{PS,E}/T_E$ for 4-flavor with Wilson fermions might remain finite even in the continuum limit in contrast to that with staggered fermions, where $m_\mathrm{PS,E}/T_E$ is very close to zero, which suggests that the difference between Wilson and staggered fermions is at least not due to the rooting.Comment: 7 pages, 6 figures, talk presented in the 36th International Symposium on Lattice Field Theory (Lattice 2018), 22-28 July, 2018, Michigan State University, East Lansing, Michigan, US

Scaling behavior of chiral phase transition in two-flavor QCD with improved Wilson quarks at finite density

We study scaling behavior of a chiral order parameter performing a simulation of two-flavor QCD with improved Wilson quarks. It has been shown that the scaling behavior of the chiral order parameter defined by a Ward-Takahashi identity agrees with the scaling function of the three-dimensional O(4) spin model at zero chemical potential. We extend the scaling study to finite density QCD. Calculating derivatives of the chiral order parameter with respect to the chemical potential in two-flavor QCD, the scaling property of chiral phase transition is discussed in the low density region. We moreover calculate the curvature of the phase boundary of the chirl phase transition in the temperature and chemical potential plane assuming the O(4) scaling relation.Comment: 7 pages, 6 figures, poster presented at the XXVIII International Symposium on Lattice Field Theory, June 14-19 2010, Villasimius, Ital