Upcoming
第137回
- 日時 Time
-
2026年2月17日（火）15:00–16:30
- 場所 Place
-
自然科学5号館数学棟4階コロキウム(Hybrid: Registration https://forms.gle/R3pQsnucyYY7nFsd6)
- 講演者 Speaker
-
吉岡 秀和 （北陸先端科学技術大学院大学）
- タイトル Title
-
Spring migration of P. altivelis altivelis based on nonnegative
diffusion bridges and related
topics（非負拡散橋に基づく春季アユ回遊の数理や関連した話題)
- 概要 Abstract
-
Plecoglossus altivelis altivelis (commonly called Ayu) is a famous
migratory fish in Japan; however, mathematical sciences behind its
migration have not been well-studied. This talk consists of the two
parts. In the first part, we explain our recent field studies with
collected data about biology and ecology of the fish, such as
environmental DNA analysis and growth survey. In the second part, we
present a mathematical approach for the spring upstream migration of Ayu
along with 10-min and 1-day fish count data. We discuss that intraday
and daily fish count data of Ayu can be modelled by using nonnegative
diffusion bridges (nonnegative continuous-time stochastic processes
pinned at initial and terminal times) with different degrees of
randomness and intermittency. We also discuss that they are derived from
a minimization principle that reduces to finding a proper solution to a
degenerate parabolic Hamilton–Jacobi–Bellman equation subject to a
singular terminal condition.
第138回
- 日時 Time
-
2026年2月18日（水）15:30–17:00
- 場所 Place
-
自然科学5号館数学棟4階コロキウム
- 講演者 Speaker
-
隠居 良行（東京科学大学）
- タイトル Title
-
A remark on the asymptotic behavior of solutions of the compressible
Navier-Stokes system on a half space
- 概要 Abstract
-
In this talk I will consider the asymptotic behavior of strong solutions
of the compressible Navier-Stokes system on a half space under the
nonslip boundary condition. It is known that the asymptotic leading term
of the solution is given by a solution of the linearized system. I will
show that the second order term in the asymptotics is given by a term
caused by a nonlinear effect, which does not appear in the asymptotics
of solutions on the whole space. This talk is based on a joint work with
T. Kobayashi (Univ. Osaka), R. Nakasato (Shinshu Univ.) and M. Okita
(Kurume College).
Information
セミナーの趣旨
2013年4月，金沢大学の偏微分方程式研究者有志が集まり本セミナーを企画しました。各回の話題は，偏微分方程式の理論的な側面を中心に，セミナー幹事の関心に従い大らかに選択しています。参加者がセミナーを十分楽しみ，勉強し，新しい発見を得られるように，各回の最初の20分から30分程度，講演者の方にはその話題への導入となるような解説をお願いしています。ご関心がある方はどなたでもご自由にご参加ください。
どうぞよろしくお願いいたします。
セミナー幹事 Organizers
Patrick van Meurs・大塚 浩史・小俣 正朗・蚊戸 宣幸・木村 正人・榊原 航也・Thomas Geert De Jong・野津 裕史・Norbert Pozar・Julius Fergy Tiongson Rabago
リンク Links
アクセス Access・数学コース Math course・計算数理プログラム Applied Math program
お問い合わせ Contact
Norbert Pozar ・npozar (at) se.kanazawa-u.ac.jp
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