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Article type: Cover
2013 Volume 68 Issue 2 Pages
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Published: February 05, 2013
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2013 Volume 68 Issue 2 Pages
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Published: February 05, 2013
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2013 Volume 68 Issue 2 Pages
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Article type: Index
2013 Volume 68 Issue 2 Pages
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Published: February 05, 2013
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Article type: Index
2013 Volume 68 Issue 2 Pages
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Article type: Appendix
2013 Volume 68 Issue 2 Pages
71-72
Published: February 05, 2013
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Hiroyuki Shiba
Article type: Article
2013 Volume 68 Issue 2 Pages
73-
Published: February 05, 2013
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Zensho Yoshida
Article type: Article
2013 Volume 68 Issue 2 Pages
74-81
Published: February 05, 2013
Released on J-STAGE: October 18, 2019
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At the heart of unsolved problems of plasma physics is often the challenge of vortex. We have yet to understand whether vortex is a "thing" or "space." Here we proffer a theory that associates vortex to the geometry of space, and apply it to the study of cosmological and astrophysical vortices/magnetic fields. Classical mechanics provides a canonical example of seeing vortex as the structure of space; the symplectic group determines vortical motion circulating in the phase space (cotangent bundle). The vortex of a plasma introduces a spontaneous, non-canonical geometry, and foliates the phase space by Casimir leaves. The Casimir invariants can be viewed as adiabatic invariants derived by coarse-graining microscopic angle variables. This picture enables us to describe scale hierarchy as a foliated phase space.
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Masafumi Akahira
Article type: Article
2013 Volume 68 Issue 2 Pages
81-88
Published: February 05, 2013
Released on J-STAGE: October 18, 2019
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In the article, we give statistical views on the occurrence of historical events like the Tohoku Earthquake causing an unprecedented natural disaster. In a history of statistics, from the end of 19th century to the beginning of 20th century, the most important discovery of the methods of statistical inference was made, and they are still widely used. In particular, we take up the chi-square goodness-of-fit test by K. Pearson (l857-1936) and the method of inference based on Student's t-distribution by W. S. Gosset (1876-1937), and further discuss recent results on the higher order approximation to a percentage point of the non-central t-distribution as the basis of the latter. Both of the methods of inference are usually used in statistical inference and data analysis, etc. even now.
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Hiroyuki Ohshima
Article type: Article
2013 Volume 68 Issue 2 Pages
89-97
Published: February 05, 2013
Released on J-STAGE: October 18, 2019
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Soft particles (or soft interfaces) are hard particles covered with an ion-penetrable surface layer of polyelectrolytes. Discussion will be made on the potential and ion distributions around a soft particle in comparison with those for a hard particle without surface structures. We then discuss the electrophoretic behaviors of hard and soft particles with particular emphasis on the electrophoretic relaxation effect. Finally we consider the electrostatic interaction between soft particles.
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Ryusuke Numata
Article type: Article
2013 Volume 68 Issue 2 Pages
98-102
Published: February 05, 2013
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Microscopic particle effects (kinetic effects) play important roles in high-temperature, low-density, weakly collisional plasmas although macroscopically plasmas are considered as fluids. Magnetic reconnection is a fundamental process of plasmas where kinetic effects are crucial. Kinetic simulations of the magnetic reconnection process by taking particle-particle collisions into account have performed, and influence of the kinetic effects on thermodynamic properties of plasmas is discussed.
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Tomohiro Harada, Masashi Kimura
Article type: Article
2013 Volume 68 Issue 2 Pages
102-106
Published: February 05, 2013
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Rapidly rotating black holes may act as natural particle accelerators to significantly high energy. It is an attractive idea to have natural particle accelerators in the space, as particle accelerators on the ground have confirmed the standard model of particle physics and are about to reveal physics beyond it. We argue that high-energy particle collisions occur near rapidly rotating black holes in rather general circumstances based on the physical investigation of this idea and discuss its implications to physics and astrophysics.
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[in Japanese]
2013 Volume 68 Issue 2 Pages
107-114
Published: 2013
Released on J-STAGE: October 18, 2019
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Tsuneya Ando
Article type: Article
2013 Volume 68 Issue 2 Pages
115-117
Published: February 05, 2013
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[in Japanese]
2013 Volume 68 Issue 2 Pages
118-
Published: February 05, 2013
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Tetsuya Yoshida
Article type: Article
2013 Volume 68 Issue 2 Pages
119-
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[in Japanese]
Article type: Article
2013 Volume 68 Issue 2 Pages
120-
Published: February 05, 2013
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[in Japanese]
Article type: Article
2013 Volume 68 Issue 2 Pages
120-121
Published: February 05, 2013
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[in Japanese]
Article type: Article
2013 Volume 68 Issue 2 Pages
121-122
Published: February 05, 2013
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[in Japanese]
Article type: Article
2013 Volume 68 Issue 2 Pages
122-123
Published: February 05, 2013
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Article type: Appendix
2013 Volume 68 Issue 2 Pages
124-127
Published: February 05, 2013
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Article type: Appendix
2013 Volume 68 Issue 2 Pages
127-128
Published: February 05, 2013
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[in Japanese]
2013 Volume 68 Issue 2 Pages
128-129
Published: February 05, 2013
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Article type: Appendix
2013 Volume 68 Issue 2 Pages
130-136
Published: February 05, 2013
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Article type: Appendix
2013 Volume 68 Issue 2 Pages
137-
Published: February 05, 2013
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Article type: Appendix
2013 Volume 68 Issue 2 Pages
138-
Published: February 05, 2013
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