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Videos de Conceptos Relacionados

Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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Forced Oscillations01:06

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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.
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Damped Oscillations01:07

Damped Oscillations

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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...
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Oscillations about an Equilibrium Position01:04

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Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
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An RLC circuit combines a resistor, inductor, and capacitor, connected in a series or parallel combination.
Consider a series RLC circuit. Here, the presence of resistance in the circuit leads to energy loss due to joule heating in the resistance. Therefore, the total electromagnetic energy in the circuit is no longer constant and decreases with time. Since the magnitude of charge, current, and potential difference continuously decreases, their oscillations are said to be damped. This is...
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When one or more data points appear far from the rest of the data, there is a need to determine whether they are outliers and whether they should be eliminated from the data set to ensure an accurate representation of the measured value. In many cases, outliers arise from gross errors (or human errors) and do not accurately reflect the underlying phenomenon. In some cases, however, these apparent outliers reflect true phenomenological differences. In these cases, we can use statistical methods...
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Updated: Jan 22, 2026

Automatic Detection of Highly Organized Theta Oscillations in the Murine EEG
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Detección de fluctuaciones de punto cero con osciladores brownianos estocásticos

Adrian E Rubio Lopez1, Felipe Herrera1

  • 1Universidad de Santiago de Chile, Department of Physics, Avenida Victor Jara 3493, Santiago, Chile and Millennium Institute for Research in Optics, Concepción, Chile.

Physical review. E
|January 21, 2026
PubMed
Resumen

Este estudio presenta una estrategia de amplificación para detectar fluctuaciones cuánticas de punto cero utilizando osciladores cuánticos de baja calidad. Este método mejora la metrología amplificando las desviaciones cuánticas, lo que permite nuevas mediciones de entornos térmicos.

Palabras clave:
metrología cuánticafluctuaciones de punto ceroosciladores cuánticosruido de frecuenciasensores cuánticostermodinámica cuánticadecoherencia cuánticabaths térmicos

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Área de la Ciencia:

  • Física cuántica
  • Metrología
  • Termodinámica

Sus antecedentes:

  • Los osciladores cuánticos de alta calidad se utilizan típicamente para la detección de precisión.
  • El alto ruido ambiental conduce a la decoherencia cuántica, perdiendo información metrológica.
  • Las interacciones térmicas más fuertes pueden ser un recurso para nuevos esquemas metrológicos.

Objetivo del estudio:

  • Presentar una estrategia general de amplificación para la detección de fluctuaciones de punto cero.
  • Permitir el uso de osciladores cuánticos de baja calidad a temperaturas finitas para la detección.
  • Ampliar la capacidad metrológica de sistemas cuánticos imperfectos.

Principales métodos:

  • Utilización de un oscilador browniano con ruido de frecuencia multiplicativo controlable.
  • Amplificación de desviaciones cuánticas del teorema virial.
  • Empleo de un entorno de temperatura constante.

Principales resultados:

  • Demostró la amplificación de desviaciones cuánticas proporcional a la intensidad del ruido de frecuencia.
  • Mostró la detección de fluctuaciones de punto cero en osciladores de baja calidad.
  • Estableció un método para observar fluctuaciones cuánticas en baños térmicos desconocidos.

Conclusiones:

  • La estrategia desarrollada mejora las capacidades metrológicas de los osciladores de baja calidad.
  • Este trabajo permite nuevas mediciones de propiedades cuánticas en entornos térmicos.
  • La detección de contribuciones de punto cero a las variables del sistema ahora es factible con este enfoque.