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Two Experiments in Dissipative Systems of Many Degrees of Freedom

Research Project

Project/Area Number 09440146
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 物性一般(含基礎論)
Research InstitutionTohoku University

Principal Investigator

SANO Masaki  Tohoku University, Associated Professor, 電気通信研究所, 助教授 (40150263)

Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥11,800,000 (Direct Cost: ¥11,800,000)
Fiscal Year 1998: ¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 1997: ¥6,100,000 (Direct Cost: ¥6,100,000)
KeywordsDissipative System / Rayleigh-Benard system / Developed Turbulence / Hard turbulence / cultured neural Network / synchronous firing / 熱乱流 / 境界層 / 培養神経細胞 / 集団振動
Research Abstract

We chose two typical experiments from Dissipative Systems with many degrees of freedom.
The one is an experiment on developed thermal turbulence in a closed cell. The second is cultured neuron network in vitro.
1. Developed thermal turbulence is created in Rayleigh-Benard configuration by using a low Prandtl number fluid, mercury. Achieved Rayleigh number (Ra) is 10^<11> and Reynolds number of the box is 5x which is the highest value among ever existing laboratory experiments for low Prandtl number fluid and compatible with the highest one for other fluid. We found a new state in thermal turbulence in which two boundary layers are inverted, i.e. viscous boundary layer is totally included within thermal boundary layer. In spite of this inversion, net heat transport across the cell (Nusselt number, Nu) was found to be proportional to Ra^<0.29> which contradicts to the theoretical prediction that Nu is proportional to Ra^<1/2> when two boundary layers are inverted. We concluded that the observed state is the asymptotic state of thermal turbulence.
2. We made cultures of neurons from 1 8days rat embryos. Network of neurons are regenerated on a glass substrate. By using Ca sensitive fluorescent dye and confocal microscope, dynamics of Ca concentration activity in neurons are measured and analyzed. We found three types of synchronous firing of neural network ; (1) Periodic (2)Non-periodic (3) Propagating synfiring pattern. We also proposed a new way of analyzing multi-point time series of neural activities. It enabled us to identify different clusters of neurons firing with different synchronous modes.

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] A.Naert: "High-Reynolds number thermal turbulence in mercury" Physical Review E. 56・2. 1302-1305 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Segawa: "Matched boundary layers in turbulent Rayleigh-Benard convection in mercury" Physical Review E. 57・1. 557-560 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Murayama: "Transition from Gaussian to Non-Gaussian Velocity Distribution Functions in a Vibrated Granular Bed" Journal of Physical Society of Japan. 67・6. 1826-18 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Segawa: "High-Rayleigh Number Turbulence of a Low Prandtl Number Fluid" Flow at Ultra-High Reynolds and Rayleigh Numbers. Springer. 247-257 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] J.A.Glazier: "Evidence for ordinary hard thermal turbulence at very high Rayleigh numbers" Nature. 398. 307-310 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] A.Naert: "High-Reynolds-number thermal turbulence in mercury" Physical Review E. 56・2. 1302-1305 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Segawa: "Matched boundary layers in turbulent Rayleigh-Benard convection in mercury" Physical Review E. 57・1. 557-560 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Murayama: "Transition from Gaussian to Non-Gaussian Velocity Distribution Functions in a Vibrated Granular Bed" Journal of Physical Society of Japan. 67・6. 1826-18* (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] T.Segawa: "High-Rayleigh Number Turbulence of a Low Prandtl Number Fluid" Flow at Ultra-High Reynolds and Rayleigh Numbers. (Springer). 247-257 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] J.A.Glazier: "Evidence for ordinary hard thermal turbulence at very high Rayleigh numbers" Nature. 398. 307-310 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] A.Naert: "High-Reynolds number thermal turbulence in mercury" Physical Review E. 56・2. 1302-1305 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Segawa: "Matched boundary layers in turbulent Rayleigh-Benard convection in mercury" Physical Review E. 57・1. 557-560 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Murayama: "Transition from Gaussian to Non-Gaussian Velocity Distribution Functions in a Vibrated Granular Bed" Journal of Physical Society of Japan. 67・6. 1826-1829 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T.Segawa: "High-Rayleigh Number Turbulence of a Low Prandtl Number Fluid" Flow at Ultra-High Reynolds and Rayleigh Numbers. (Springer). 247-257 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] J.A.Glazier: "Evidence for ordinary hard thermal turbulence at very high Rayleigh numbers" Nature. (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] A.Naert,: "High-Reynolds-number thermal turbulence in mercary" Physical Review E. 56,2. 1302-1305 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Segawa,: "Matchsd boundary layers in turbulent Rayleigh-Benard convection of mercury" Physical Review E. 57,1. 557-560 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] A.Yuse: "Instabililies of quasi-static crack patterns in quenched glass plates" Physica D. 108. 365-378 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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