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| 2008年5月23日 | Prof. Ho Bun Chan (Univ. of Florida) |
| 題目 | Fluctuational phenomena in micromechanical systems - from Casimir effect to activated switching |
| 内容 | As micro and nanomechanical structures continue to shrink in size, fluctuation effects become increasingly important in their operation. The Casimir force, for example, originates from the zero-point quantum fluctuations of the electromagnetic field and the boundary conditions imposed by conducting surfaces. We explore the Casimir effect using a micromechanical torsional oscillator. In particular, we present recent measurements on a nanostructured surface that demonstrates the nontrivial boundary dependence of the Casimir force. I will also describe other phenomena that arise from the interplay between fluctuations and nonlinearity. Under strong periodic drive, a nonlinear micromechanical oscillator develops bistability. In the presence of fluctuations, the system can occasionally overcome the activation barrier and switch from one state to the other. We measure the escape trajectories followed by the oscillator, confirming the notion that they form narrow tubes in phase space centered at the most probable escape path. We also observed a wide range of other generic phenomena, including universal scaling of the activation barrier near bifurcation points and the occurrence of kinetic phase transition at comparable state occupations. |
| GCOE |
| 2008年4月4日 | Prof. Vakhtang Putkaradze (Colorado State Univ.) |
| 題目 | Continuum models for self-organization of micro- and nano-particles and dynamical models for biological curves |
| 写真 | |
| GCOE | |
| 2007年6月20日 | 長谷川 晃朗 博士 (ATR) |
| 題目 | 無線ネットワークと非線形性 |
| 写真 |  P1010067.JPG |
| 2007年3月31日 | Prof. Marian Wiercigroch (University of Aberdeen, College of Physical Sciences) |
| 題目 | Dynamics of Non-smooth Systems |
| 写真 | |
| KiDS | |
| 2007年3月11日 | 滑川 徹 助教授 (金沢大学) |
| 題目 | 制御工学に関する2，3のトピックス |
| 写真 |  P1010055.JPG |
| 2006年12月7日 | Dr. Pawel Pilarcyzk (Kyoto University, Mathematics Department) |
| 題目 | Computational Dynamics and Cubical Homology |
| 写真 | |
| 2006年8月17日 | Prof. Igor Mezic (Mechanical Engineering Department, University of California, Santa Barbara) |
| 題目 | Biomolecules as nonlinear oscillators: Life-enabling dynamics |
| 写真 | |
| KiDS, 21世紀COEプログラム講演会 | |
| 2006年7月12日 | Prof. Vakhtang Putkaradze (Colorado State University, Mathematics Department) |
| 題目 | Mathematical models of self-aggregation of particles at nano-scales (or cheerios at 50 nanometers) |
| 写真 | |
| KiDS, 21世紀COEプログラム講演会 | |
| 2006年6月23日 | Prof. Juan Carlos Balda (University of Arkansas) |
| 題目 | The Next Generation of Power Electronics Interfaces for High Power and High Voltage Distribution System Applications |
| 写真 | |
| 21世紀COEプログラム講演会 | |
| 2006年5月23日 | Prof. Alan Mantooth (University of Arkansas) |
| 題目 | Silicon Carbide Research Into High-Voltage Power Electronics for Extreme Environments |
| 写真 | |
| 21世紀COEプログラム講演会 |
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