Butsuri
Online ISSN : 2423-8872
Print ISSN : 0029-0181
ISSN-L : 0029-0181
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Volume 71, Issue 6
Displaying 1-27 of 27 articles from this issue
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Preface
Contents
70 Challenges and Mysteries in Physics
Trends
Interdisciplinary
  • A Novel Account for the Large Dielectric Constant of Neural Tissue at Low-Frequency
    Hiroyoshi Miyakawa, Toru Aonishi
    Article type: Interdisciplinary
    2016 Volume 71 Issue 6 Pages 352-361
    Published: June 05, 2016
    Released on J-STAGE: August 10, 2016
    DOIhttps://doi.org/10.11316/butsuri.71.6_352
    JOURNAL FREE ACCESS
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    It has been known for sometime that brain tissue show marked low-frequency dielectric dispersion and large permittivity (>106) in a frequency range of 10–100 Hz. We have shown that these properties can be due to electrically long neurites by solving equations that describe a model with a bundle of finite length cylindrical neurites subjected to oscillating extracellular electric fields. We also provide a notion of the apparent extracellular space and a generalized formulation for the EEG inverse problem that takes permittivity into account.

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Reviews
Researches
  • Formulation of Uncertainty Relation by using Quantum Estimation Theory
    Yu Watanabe, Masahito Ueda
    Article type: Researches
    2016 Volume 71 Issue 6 Pages 372-376
    Published: June 05, 2016
    Released on J-STAGE: August 10, 2016
    DOIhttps://doi.org/10.11316/butsuri.71.6_372
    JOURNAL FREE ACCESS
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    We formulate error and disturbance in quantum measurement in terms of the classical Fisher information and the quantum Fisher information. The error formulated here characterizes the accuracy of the estimate of the expectation value of an observable. The disturbance characterizes the irreversibility of the measurement process. We show that the product of the error and disturbance is bounded from below by the commutator of the observables. We also find the attainable bound of the product.

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