Practical Periodically Variable Systems

Richards, John A.

doi:10.1007/978-3-642-81873-8_7

Cited by 4 publications

(1 citation statement)

References 58 publications

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“…However, this research topic was for many years of great interest to the electronic engineering community under the name of Time Varying Dielectric Media. 39,40,41…”

Section: Resultsmentioning

confidence: 99%

The neuron as a temporal electroacoustic medium

Meseguer,

Ramiro-Manzano

2023

Preprint

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The human brain is one of the most complex and intriguing scientific topics. The most stablished theory of neuronal communication is a pure electrical model based on the propagation of intracell cationic charges along the neurons. Here we propose a complementary model based on two properties of brain communication: A) The large Coulomb repulsion within the intracell Na+ cation pulse at the Action Potential (AP) induces a deformation of the neuron membrane which travels as an acoustic signal, i.e.: the intracell ion pulse makes both the electric and acoustic signals be strongly correlated. B) As brain communication is stablished through a periodic train of AP pulses it induces a time periodic modulation of the acoustic parameters. In this framework we propose envisaging the neuron as a temporal electro-acoustic medium. The temporal varying media framework could help understanding brain conundrums such as propagation routes involved in the neuronal plasticity in the consolidation of the memory, as well as on the generation of the signals associated to the brain field theory.

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“…However, this research topic was for many years of great interest to the electronic engineering community under the name of Time Varying Dielectric Media. 39,40,41…”

Section: Resultsmentioning

confidence: 99%

The neuron as a temporal electroacoustic medium

Meseguer,

Ramiro-Manzano

2023

Preprint

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Cyclostationary mode of pyroelectric sensor

Samoylov

Щедрина

2018

Sensors and Actuators A: Physical

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Stress Wave Isolation by Purely Mechanical Topological Phononic Crystals

Chaunsali

Yang

2016

Sci Rep

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We present an active, purely mechanical stress wave isolator that consists of short cylindrical particles arranged in a helical architecture. This phononic structure allows us to change inter-particle stiffness dynamically by controlling the contact angles of the cylinders. We use torsional travelling waves to control the contact angles, thereby imposing a desired spatio-temporal stiffness variation to the phononic crystal along the longitudinal direction. Such torsional excitation is a form of parametric pumping in the system, which results in the breakage of the time-reversal symmetry. We report that, in quasi-static sense, the system shows topologically non-trivial band-gaps. However, in a dynamic regime where the pumping effect is significant, these band-gaps become asymmetric with respect to the frequency and wavenumber domains in the dispersion relationship. By using numerical simulations, we show that such asymmetry has a direct correspondence to the topological invariant, i.e., Chern number, of the system. We propose that this asymmetry, accompanied by selective inter-band transition, can be utilized for directional isolation of the stress wave propagating along the phononic crystal.

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Practical Periodically Variable Systems

Cited by 4 publications

References 58 publications

The neuron as a temporal electroacoustic medium

The neuron as a temporal electroacoustic medium

Cyclostationary mode of pyroelectric sensor

Stress Wave Isolation by Purely Mechanical Topological Phononic Crystals

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