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Related Concept Videos

Nonlinear Pharmacokinetics: Causes of Nonlinearity01:22

Nonlinear Pharmacokinetics: Causes of Nonlinearity

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Nonlinearity in drug pharmacokinetics is caused by various factors influencing how a drug is absorbed, distributed, metabolized, and excreted. Understanding these nonlinear processes is crucial for predicting drug behavior in the body and optimizing drug dosing regimens.
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Gain01:15

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Gain and phase shift are properties of linear circuits that describe the effect a circuit has on a sinusoidal input voltage or current. The circuit's behavior that contains reactive elements will depend on the frequency of the input sinusoid. As a result, it is observed that the gain and phase shift will all be frequency functions.
Gain:
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The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss.
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In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
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Updated: Jan 28, 2026

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Gain through losses in nonlinear optics.

Auro M Perego1, Sergei K Turitsyn1,2, Kestutis Staliunas3,4

  • 11Aston Institute of Photonic Technologies, Aston University, Birmingham, B4 7ET UK.

Light, Science & Applications
|March 7, 2019
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Summary
This summary is machine-generated.

Dissipation can induce modulation instabilities (MIs) and signal amplification in nonlinear optical systems, leading to gain through losses. This phenomenon offers new possibilities for designing optical amplifiers and lasers.

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Area of Science:

  • Nonlinear optics
  • Optical fiber systems
  • Complex systems dynamics

Background:

  • Modulation instabilities (MIs) are fundamental to symmetry breaking and pattern formation in nonlinear systems.
  • In nonlinear optics, MIs are typically associated with parametric amplification under specific phase-matching conditions.
  • Dissipative systems exhibit unique instability behaviors not observed in conservative systems.

Purpose of the Study:

  • To review key findings on modulation instabilities and parametric amplification in nonlinear optics, focusing on optical fibers.
  • To explore recent research on dissipation-induced modulation instabilities and signal amplification.
  • To discuss the concept of 'imaging losses into gain' and its implications.

Main Methods:

  • Review of theoretical principles and experimental results in nonlinear optics.
  • Analysis of modulation instability phenomena in dissipative optical systems.
  • Conceptual framework for mapping spectral loss profiles to gain spectra.

Main Results:

  • Dissipation can paradoxically lead to exponential growth of damped modes, creating 'gain through losses'.
  • The concept of 'imaging losses into gain' demonstrates how spectral loss can be converted into amplification.
  • Dissipation-induced MIs have significant theoretical and practical implications.

Conclusions:

  • Dissipation-induced modulation instability is a novel phenomenon with fundamental scientific interest.
  • This effect provides a pathway for developing new tunable fiber-based optical amplifiers.
  • Potential applications include optical parametric oscillators, frequency comb sources, and pulsed lasers.