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Related Concept Videos

Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
Wind Turbine Machine Models01:24

Wind Turbine Machine Models

In the growing field of wind energy, incorporating wind turbine models into transient stability analysis is essential. Induction and synchronous machines are the primary models used, with induction machines being prevalent due to their simplicity and reliability.
Induction machines interact through the rotating magnetic field generated by the stator and the rotor. The key parameter is slip, which is the difference between synchronous speed and rotor speed relative to synchronous speed. Slip is...
Turbulent Flow01:24

Turbulent Flow

Turbulent flow is characterized by unpredictable fluctuations in velocity and pressure, which result in a chaotic fluid movement distinct from the orderly patterns of laminar flow. While laminar flow is governed by smooth, parallel layers with minimal mixing, turbulent flow exhibits highly irregular, three-dimensional patterns. This behavior arises due to instabilities in the fluid's velocity profile, and amplifies as the flow velocity increases. Minor disturbances, known as turbulent spots,...
General External Flow Characteristics01:26

General External Flow Characteristics

The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
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Influence of Earth's Curvature and Atmospheric Refraction on Leveling

During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance. Over a...
Scaling01:26

Scaling

In designing and analyzing filters, resonant circuits, or circuit analysis at large, working with standard element values like 1 ohm, 1 henry, or 1 farad can be convenient before scaling these values to more realistic figures. This approach is widely utilized by not employing realistic element values in numerous examples and problems; it simplifies mastering circuit analysis through convenient component values. The complexity of calculations is thereby reduced, with the understanding that...

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Related Experiment Video

Updated: Jul 2, 2026

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
08:54

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing

Published on: February 13, 2018

Cross-scale effects in solar-wind turbulence.

F Valentini1, P Veltri, F Califano

  • 1Dipartimento di Fisica and CNISM, Università della Calabria, 87036 Rende CS, Italy.

Physical Review Letters
|September 4, 2008
PubMed
Summary

Understanding turbulent energy dissipation in space plasmas is key. This study reveals ion-acoustic turbulence and ion beams as crucial mechanisms in the solar wind

Area of Science:

  • Space Physics
  • Plasma Physics
  • Turbulence Theory

Background:

  • Collisionless plasmas lack viscosity, making small-scale energy dissipation a major challenge.
  • Understanding kinetic effects is crucial for linking macroscopic and microscopic plasma dynamics.

Purpose of the Study:

  • To numerically analyze kinetic effects in the turbulent energy cascade of solar-wind plasmas.
  • To identify the physical mechanisms responsible for energy dissipation at small scales.

Main Methods:

  • Numerical analysis of kinetic effects.
  • Simulation of turbulent energy cascade in solar-wind plasmas.
  • Interpretation of spacecraft observations.

Main Results:

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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques
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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

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Last Updated: Jul 2, 2026

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Published on: February 13, 2018

Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface
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  • Identified ion-acoustic turbulence as a key dissipation mechanism.
  • Observed bursts of electrostatic activity.
  • Detected accelerated ion beams in the ion distribution function.
  • Showed an increase in ion perpendicular temperature.

    • Conclusions:

    • Kinetic effects, specifically ion-acoustic turbulence and ion beams, play a vital role in dissipating energy in collisionless space plasmas.
    • These findings offer a unified interpretation of spacecraft observations related to turbulent heating.
    • This research advances the understanding of energy transfer from large to small scales in astrophysical plasmas.