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今後の研究室内セミナー?集中講義の予定
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非平衡ダイナミクスセミナー
日時：5月14日13時より 場所：対面(奈良女子大学B棟1206教室) スケジュール： *13:00~14:30 Lucas Goehring 氏 14:30~15:00 30分休憩 *15:00~16:30 Bokusui Nakayama 氏 講演：Lucas Goehring 氏 (Nottingham Trent University) 題名： Stability and dynamics of convection in dry salt lakes 概要
From fairy circles to patterned ground and columnar joints, natural patterns spontaneously appear in many complex geophysical settings.
Here, I will discuss the origins of polygonally patterned crusts of salt playa and salt pans.
These beautifully regular features, approximately a meter in diameter, are found worldwide and are fundamentally important to the transport of salt and dust in arid regions.
I will show how these patterns are consistent with the surface expression of buoyancy-driven convection in the porous soil beneath a salt crust.
By combining quantitative results from direct field observations, analogue experiments and numerical simulations,
I will show how salt polygons can form from such a convective instability, as well as how their characteristic size emerges. (provided by Prof.Goehring)
講演：Bokusui Nakayama(中山 牧水) 氏 (Kyoto University) 題名： Stigmergy in an Active Colloidal System 概要
Some species complete tasks by using indirect interaction with pheromone signaling.
This class of communication strategies, in which agents interact with each other via shared memory remaining on the platform, is called “stigmergy”.
Since stigmergy plays an essential role in swarm intelligence that provides us with powerful algorithms, stigmergy became a much more attractive topic in many research fields including active matter physics.
Here, we introduced stigmergy-like interaction into an active colloidal system by utilizing a phase-change material (PCM) that has binary states (amorphous and crystalline phase).
In this system, we placed a PCM as an active colloid platform that can memorize the paths formed by the particles.
This behavior is similar to the pheromone deposition process that can be seen in ants swarm.
Also, we capped a PCM film on a colloid to define the state of individual agents.
Like an ant changes its response to pheromones depending on its state, the active colloids also change their behavior according to the cap’s phase.
問合せ先：奈良女子大学 狐崎 創, 下川 倫子
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過去の研究室内セミナー?集中講義の記録
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