1988 Fiscal Year Final Research Report Summary
Enlightenment of teaching material for cultivate the creation
| Project/Area Number |
62580249
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
科学教育(含教育工学)
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| Research Institution | Tokushima University |
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Principal Investigator |
WAKI Tskeshi Faculty of EDUCATION, University of Tokushima, 総合科学部, 教授 (70035301)
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| Co-Investigator(Kenkyū-buntansha) |
YOSHIKAWA Kenichi College of General Education, University of Nagoya, 教養部, 助教授 (80110823)
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| Project Period (FY) |
1987 – 1988
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| Keywords | teaching material for visual education / Rhythmic Movement / non-linear non-equilibrium / non-linear oscillation / 秩序形成 / 非線形振動 |
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| Research Abstract |
Under conditions far from equilibrium, spontaneous oscillations can be generated of "self-organization" from the experiment of the B-Z reaction. in this project we studied a curious oscillatory phenomenon in quite a simple system, a salt-water oscillator. We believe that this system is profitable for students of biology, chemistry and physics in understanding the major concepts of non-linear dynamics in a far-from-equilibrium condition.
In 1970, Martin, a geophysist, found a curious phenomenon rhythmic oscillations of water flow are generated when a vertically oriented hypodermic syringe, with the plunger removed, is filled with salt-water and partially submerged in a beaker of pure-water. The oscillations appear as a downward jet of salt-water, followed by an upward jet of pure-water, and so on for many cycles.
Here, We would like only to mention the presence of an "auto-catalytic" process in the oscillator. let us consider the moment when salt-water fills the pore and thus the heavy salt-water tends to go downward from the pore. The salt-water, just below the pore, affects the downward buoyant force, due to the difference between its density and that of the surrounding pure-water. From the condition of continuity of the fluid, the salt-water within the pore is also pulled downward from the salt water below the pore. this situation corresponds to the "auto-catalytic" process. A similar situation also holds for the upward flow of the pure-water.
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Research Products
(10 results)
