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Related Concept Videos

Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
Entropy Change in Reversible Processes01:10

Entropy Change in Reversible Processes

In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
Forced Oscillations01:06

Forced Oscillations

When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
Damped Oscillations01:07

Damped Oscillations

In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
Entropy Changes Accompanying Specific Processes01:21

Entropy Changes Accompanying Specific Processes

Entropy, a measure of disorder in a system, changes during phase transitions like freezing or boiling. At the transition temperature Ttrs, where two phases are in equilibrium, the phase transition is a reversible process. The entropy change can be calculated from a substance's enthalpy of transition using the equation ΔStrs = ΔtrsH /Ttrs.When a perfect gas expands isothermally from one volume to another, entropy increases logarithmically with volume. Conversely, isothermal compression results...
Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not immune...

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Related Experiment Video

Updated: Jun 29, 2026

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
12:21

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

Entropic stochastic resonance.

P S Burada1, G Schmid, D Reguera

  • 1Institut für Physik, Universität Augsburg, Universitätsstr. 1, D-86135 Augsburg, Germany.

Physical Review Letters
|October 15, 2008
PubMed
Summary
This summary is machine-generated.

We discovered entropic stochastic resonance in confined Brownian motion. Uneven boundaries enhance particle response to periodic forces, offering new control for nanodevices.

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Stochastic Noise Application for the Assessment of Medial Vestibular Nucleus Neuron Sensitivity In Vitro
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Stochastic Noise Application for the Assessment of Medial Vestibular Nucleus Neuron Sensitivity In Vitro

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Last Updated: Jun 29, 2026

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
12:21

Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators

Published on: April 4, 2016

Stochastic Noise Application for the Assessment of Medial Vestibular Nucleus Neuron Sensitivity In Vitro
06:22

Stochastic Noise Application for the Assessment of Medial Vestibular Nucleus Neuron Sensitivity In Vitro

Published on: August 28, 2019

Area of Science:

  • Statistical Physics
  • Nanotechnology
  • Soft Matter Physics

Background:

  • Stochastic resonance (SR) is a phenomenon where a weak periodic signal is amplified by an optimal level of noise.
  • Brownian motion in confined systems is crucial for understanding nanoscale phenomena.
  • Traditional SR typically occurs in systems with potential barriers.

Purpose of the Study:

  • To investigate a novel form of stochastic resonance in confined Brownian dynamics.
  • To explore the role of boundary geometry in influencing stochastic resonance.
  • To establish entropic contributions as a driver for stochastic resonance in confined media.

Main Methods:

  • Simulating Brownian particle dynamics in a medium with uneven boundaries.
  • Applying a periodic driving force to the system.
  • Analyzing the spectral amplification as a function of noise intensity and boundary conditions.

Main Results:

  • Demonstrated the appearance of stochastic resonance due to entropic forces from uneven boundaries.
  • Observed an increase in spectral amplification at an optimal noise level.
  • Showcased that boundary-induced entropic potential can drive resonance phenomena.

Conclusions:

  • Entropic stochastic resonance is a viable phenomenon in confined systems.
  • This mechanism provides a new pathway for controlling nanoscale systems.
  • The findings have implications for manipulating single molecules and nanodevices.