諸分野のための数学研究会

過去の記録 ~05/28次回の予定今後の予定 05/29~

開催情報 火曜日 10:30~11:30 数理科学研究科棟(駒場) 056号室
担当者 儀我美一、石村直之(中央大学)、齊藤宣一、山本昌宏
セミナーURL http://coe.math.sci.hokudai.ac.jp/sympo/various/
目的 北海道大学のHPには、第1回(2005年6月22日)~第22回(2009年2月18日)の情報が掲載されております。

2007年12月04日(火)

15:00-17:15   数理科学研究科棟(駒場) 122号室
Pavel Krejci 氏 (Weierstrass Institute for Applied Analysis and Stochastics) 15:00-16:00
Quasilinear hyperbolic equations with hysteresis
[ 講演概要 ]
We consider a wave propagation problem in a rate independent elastoplastic material described by a counterclockwise convex hysteresis operator. Unlike in viscoelasticity, the speed of propagation is bounded above by the speed of the corresponding elastic waves. The smoothening dissipative effect is due to the convexity of the hysteresis branches. We present some recent results on the long time behavior of solutions under various boundary conditions, including the stability of time periodic solutions under periodic forcing.
[ 参考URL ]
http://coe.math.sci.hokudai.ac.jp/sympo/various/index.html
Victor Isakov 氏 (Wichita State University) 16:15-17:15
Carleman estimates for second order operators with two large parameters
[ 講演概要 ]
We obtain new Carleman type estimates for general second order linear partial differential operators. These estimates hold for the weight functions under pseudoconvexity conditions relating the operator and weight function. We discuss these conditions. We give applications to uniqueness and stability of the continuation and inverse problems for elasticity system with residual stress without smallness assumptions on residual stress. This is a joint work with Nanhee Kim.
[ 参考URL ]
http://coe.math.sci.hokudai.ac.jp/sympo/various/index.html