Development of a Study Plan on Investigating Climatological Features of the Baiu Precipitation Based on the Daily Data with Attention to Appearance of Heavy Rainfall Events (A Report of a Class in Attached Junior High School of Okayama University)

　梅雨は，アジアモンスーンの影響を顕著に受けた現象の一つである。本研究では，豪雨の起こり方に注目した日降水量データの分析活動や気象衛星画像の観察など通して梅雨について学ぶ学習プランを開発した。これは中学校理科での「日本の四季の天気」に関する探究的要素も含めた授業提案であるが，高等学校の『地学基礎』，『地学』，『地理』における活用も視野に置いた。研究科教員による附属学校園への相互乗り入れ授業の一環として，岡山大学附属中学校1年生を対象に授業実践を行い，結果について検討した。西日本では，東日本と違い，『大雨日』が頻繁に出現することを反映して，気候学的に総降水量が大変多くなる。授業では，そのような特徴の一端を九州の長崎と関東の東京の6〜7月における1971〜1998 年の日降水量の表から読み解く作業・考察を，中心的活動の一つに据えた

Nuclear Magnetic Relaxation Rate in the Vortex State of a Chiral p-Wave Superconductor

The site-selective nuclear spin-lattice relaxation rate T1^{-1} is theoretically studied inside a vortex core in a chiral p-wave superconductor within the framework of the quasiclassical theory of superconductivity. It is found that T1^{-1} at the vortex center depends on the sense of the chirality relative to the sense of the magnetic field. Our numerical result shows a characteristic difference in T1^{-1} between the two chiral states, k_x + i k_y and k_x - i k_y under the magnetic field.Comment: 2 pages, 2 figures; To be published in Physica C; Proc. of LT23, Hiroshima (Japan), 20-27 Aug. 200

Elementary vortex pinning potential in superconductors with unconventional order parameter

The elementary vortex pinning potential is studied in unconventional superconductors within the framework of the quasiclassical theory of superconductivity. Numerical results are presented for d-, anisotropic s-, and isotropic s-wave superconductors to show explicitly that in unconventional superconductors the vortex pinning potential is determined mainly by the loss of the condensation energy in bulk due to the presence of the pinning center, i.e., by the breakdown of the Anderson's theorem. It is found that the vortex pinning energy in the d-wave pairing case is 4 -- 13 times larger than those in the s-wave pairing cases. This means that an enhancement of pinning effect in unconventional superconductors occurs due to the breakdown of the Anderson's theorem. The case of a chiral p-wave superconductor is also investigated in terms of the vortex core states subject to the Andreev reflection, where important is whether the vorticity and chirality are parallel or antiparallel.Comment: 7 pages, 4 figures included; paper for Proceedings of the symposium SDP2001, Tokyo, 200

Impurity Effect on Kramer-Pesch Core Shrinkage in s -Wave Vortex and Chiral p -Wave Vortex

No Heading: The low-temperature shrinking of the vortex core (Kramer-Pesch effect) is studied for an isolated single vortex for chiral p-wave and s-wave superconducting phases. The effect of nonmagnetic impurities on the vortex core radius is numerically investigated in the Born limit by means of a quasiclassical approach. It is shown that in the chiral p-wave phase the Kramer-Pesch effect displays a certain robustness against impurities owing to a specific quantum effect, while the s-wave phase reacts more sensitively to impurity scattering. This suggests chiral p-wave superconductors as promising candidates for the experimental observation of the Kramer-Pesch effec

凝縮系における物質の電子状態,磁性及び反応の理論的研究

取得学位：博士(理学)，学位授与番号：博甲第697号，学位授与年月日：平成17年3月22日,学位授与年：200