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

Faraday Disk Dynamo

Faraday Disk Dynamo

A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...

Torque On A Current Loop In A Magnetic Field

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

Simplified Synchronous Machine Model

Simplified Synchronous Machine Model

The Synchronous Machine Model is a fundamental tool in analyzing and ensuring the transient stability of power systems. This model simplifies the representation of a synchronous machine under balanced three-phase positive-sequence conditions, assuming constant excitation and ignoring losses and saturation. The model is pivotal for understanding the behavior of synchronous generators connected to a power grid, particularly during transient events.
In this model, each generator is connected to a...

Fast Decoupled and DC Powerflow

Fast Decoupled and DC Powerflow

The fast decoupled power flow method addresses contingencies in power system operations, such as generator outages or transmission line failures. This method provides quick power flow solutions, essential for real-time system adjustments. Fast decoupled power flow algorithms simplify the Jacobian matrix by neglecting certain elements, leading to two sets of decoupled equations:

DC Generator

DC Generator

An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts mechanical energy into electrical energy, which are DC pulses with the same polarity. The construction of a DC generator is similar to that of an alternator, except that the pair of slip rings is replaced by a single split ring, also called a commutator. The commutator functions like a periodic rotary switch; it changes the contacts with the...

The Swing Equation

The Swing Equation

The Swing Equation is a fundamental tool in power system dynamics, especially for analyzing the behavior of generating units like three-phase synchronous generators. This equation emerges from applying Newton's second law to the rotor of a generator, encompassing factors such as inertia, angular acceleration, and the interplay between mechanical and electrical torques.
In a steady-state operation, the mechanical torque (Τm) supplied to the generator is balanced by the electrical torque...

You might also read

Related Articles

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

Sort by

Same author

Universal growth of magnetic energy during the nonlinear phase of subsonic and supersonic small-scale dynamos.

Physical review. E·2026

Same author

Mtb-Specific Interferon-Gamma ELISpot Assays Have Greater Sensitivity for Detecting Mtb Infection Compared to Tuberculin Skin Test in a Cohort of Experimentally M. tuberculosis-Infected Macaques.

Journal of the American Association for Laboratory Animal Science : JAALAS·2026

Same author

Antiretroviral treatment does not prevent extrapulmonary tuberculosis during SIV/Mtb coinfection in macaques.

JCI insight·2026

Same author

A complex structure of escaping helium spanning more than half the orbit of the ultra-hot Jupiter WASP-121 b.

Nature communications·2025

Same author

Chiral Anomaly and Dynamos from Inhomogeneous Chemical Potential Fluctuations.

Physical review letters·2024

Same author

Production of a Chiral Magnetic Anomaly with Emerging Turbulence and Mean-Field Dynamo Action.

Physical review letters·2022

Search research articles

Related Experiment Video

Updated: Jul 23, 2025

Reconstituting and Characterizing Actin-Microtubule Composites with Tunable Motor-Driven Dynamics and Mechanics

Reconstituting and Characterizing Actin-Microtubule Composites with Tunable Motor-Driven Dynamics and Mechanics

Published on: August 25, 2022

Small-scale dynamo with finite correlation times.

Yann Carteret¹, Dominik Schleicher², Jennifer Schober¹

¹Laboratoire d'Astrophysique, EPFL, CH-1290 Sauverny, Switzerland.

Physical Review. E

|July 19, 2023

Summary

This study extends the Kazantsev model for cosmic magnetic fields to include compressible turbulent plasmas. The findings show the Kazantsev spectrum is preserved, with growth rates minimally affected by finite correlation times.

More Related Videos

Utilizing Time-Resolved Protein-Induced Fluorescence Enhancement to Identify Stable Local Conformations One α-Synuclein Monomer at a Time

Utilizing Time-Resolved Protein-Induced Fluorescence Enhancement to Identify Stable Local Conformations One α-Synuclein Monomer at a Time

Published on: May 30, 2021

Application of Voltage in Dynamic Light Scattering Particle Size Analysis

Application of Voltage in Dynamic Light Scattering Particle Size Analysis

Published on: January 24, 2020

Related Experiment Videos

Last Updated: Jul 23, 2025

Reconstituting and Characterizing Actin-Microtubule Composites with Tunable Motor-Driven Dynamics and Mechanics

Reconstituting and Characterizing Actin-Microtubule Composites with Tunable Motor-Driven Dynamics and Mechanics

Published on: August 25, 2022

Utilizing Time-Resolved Protein-Induced Fluorescence Enhancement to Identify Stable Local Conformations One α-Synuclein Monomer at a Time

Utilizing Time-Resolved Protein-Induced Fluorescence Enhancement to Identify Stable Local Conformations One α-Synuclein Monomer at a Time

Published on: May 30, 2021

Application of Voltage in Dynamic Light Scattering Particle Size Analysis

Application of Voltage in Dynamic Light Scattering Particle Size Analysis

Published on: January 24, 2020

Area of Science:

Astrophysics
Plasma Physics
Magnetohydrodynamics

Background:

Turbulent plasmas in astrophysics generate magnetic fields via fluctuation dynamos.
Existing models like Kazantsev's rely on simplifying assumptions (incompressibility, delta-correlated time).
These assumptions are often violated in the interstellar medium due to compressibility and finite correlation times.

Purpose of the Study:

To generalize the Kazantsev model for turbulent flows with compressibility and finite correlation times.
To analytically investigate the cumulative effects of these factors on the magnetic spectrum.
To extend understanding of cosmic magnetic field amplification and maintenance.

Main Methods:

Utilized the renewing flow method.
Derived a generalized Kazantsev equation for the longitudinal two-point magnetic correlation function.
Applied the Wentzel-Kramers-Brillouin approximation for small Strouhal numbers.

Main Results:

The Kazantsev spectrum (M_{k}(k)∼k^{3/2}) is preserved under generalized conditions.
Finite correlation time has a negligible effect on the growth rate.
Growth rate is reduced by finite magnetic diffusivity and degree of compressibility (DOC).

Conclusions:

The generalized model provides a more realistic description of magnetic field generation in astrophysical plasmas.
Compressibility and magnetic diffusivity significantly impact dynamo efficiency.
The study refines analytical understanding of cosmic magnetic field dynamics.