Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Magnetic Damping

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

Sound as Pressure Waves

Sound as Pressure Waves

Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...

Doppler Effect - II

Doppler Effect - II

The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...

Standing Waves in a Cavity

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

Perceiving Loudness, Pitch, and Location

Perceiving Loudness, Pitch, and Location

The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...

$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Surface nematic uniformity.

Physical review. E·2026

Same author

Geometric method to determine planar anchoring strength for chromonics.

Physical review. E·2024

Same author

Correction: Pure measures of bending for soft plates.

Soft matter·2023

Same author

Pure measures of bending for soft plates.

Soft matter·2023

Same author

A Ribbon Model for Nematic Polymer Networks.

Journal Of Elasticity·2023

Same author

Paradoxes for chromonic liquid crystal droplets.

Physical review. E·2022

Search research articles

Related Experiment Video

Updated: Jun 3, 2026

A Method to Study Adaptation to Left-Right Reversed Audition

A Method to Study Adaptation to Left-Right Reversed Audition

Published on: October 29, 2018

Director libration in nematoacoustics.

Giovanni De Matteis¹, Epifanio G Virga

¹Dipartimento di Matematica, Università di Pavia, Pavia, Italy. giovanni.dematteis@unipv.it

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 17, 2011

Summary

This summary is machine-generated.

This study analyzes nematoacoustics by modeling director libration, a periodic vibration of the nematic director. Researchers estimated acoustic susceptibilities and viscosity using experimental data.

More Related Videos

Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions

Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions

Published on: November 25, 2017

An Automated System for Sound Localization Testing in Hearing-Impaired Listeners

An Automated System for Sound Localization Testing in Hearing-Impaired Listeners

Published on: March 13, 2026

Related Experiment Videos

Last Updated: Jun 3, 2026

A Method to Study Adaptation to Left-Right Reversed Audition

A Method to Study Adaptation to Left-Right Reversed Audition

Published on: October 29, 2018

Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions

Hemi-laryngeal Setup for Studying Vocal Fold Vibration in Three Dimensions

Published on: November 25, 2017

An Automated System for Sound Localization Testing in Hearing-Impaired Listeners

An Automated System for Sound Localization Testing in Hearing-Impaired Listeners

Published on: March 13, 2026

Area of Science:

Physics
Materials Science
Acoustics

Background:

A variational theory for nematoacoustics was previously proposed by Virga.
Understanding the coupling between acoustic fields and nematic directors is crucial.

Purpose of the Study:

To extend the variational theory for nematoacoustics.
To analyze the phenomenon of director libration, a periodic vibration of the nematic director.
To estimate key parameters of the theory using experimental data.

Main Methods:

Extended a variational theory for nematoacoustics.
Incorporated director libration, a periodic motion of the nematic director.
Estimated acoustic susceptibilities and an extra viscosity coefficient.

Main Results:

The analysis successfully incorporated director libration into the nematoacoustic theory.
Acoustic susceptibilities and an extra viscosity coefficient were estimated.
The extended theory provides a framework for understanding director-acoustic field coupling.

Conclusions:

The extended variational theory offers a more comprehensive model for nematoacoustics.
The estimated parameters are valuable for further experimental and theoretical investigations.
This work contributes to the understanding of acoustic wave propagation in nematic materials.