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Related Concept Videos

Displacement Current01:19

Displacement Current

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Ampère's law, in its usual form, does not work in places where the current changes with time and is not steady. Thus, Maxwell suggested including an additional contribution, called the displacement current, Id, to the real conduction current I.
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Position and Displacement01:31

Position and Displacement

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The position of an object defines its location relative to a convenient frame of reference at any particular time. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference, and we often describe the position of an object as it relates to stationary objects on Earth. For example, a rocket launch could be described in terms of the position of the rocket with respect to Earth as a whole. On the other...
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Position and Displacement Vectors01:00

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To describe the motion of an object, one should first be able to describe its position (where it is at any particular time). More precisely, the position needs to be specified relative to a convenient frame of reference. A frame of reference is an arbitrary set of axes from which the position and motion of an object are described. Earth is often used as a frame of reference to describe the position of an object in relation to stationary objects on Earth.
Further, several important kinds of...
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Significance of Displacement Current01:27

Significance of Displacement Current

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A displacement current is analogous to a real current in Ampère's law, participating in Ampère's law the same way as the usual conduction current. However, it is produced by a changing electric field. Displacement current is defined in terms of a time-varying electric field, and also has an associated displacement current density. By adding a term accounting for displacement current, Maxwell modified the existing Ampère's law, which is now called generalized Ampère's law.
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Angular Velocity and Displacement01:08

Angular Velocity and Displacement

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Uniform circular motion is motion in a circle at a constant speed. Although this is the simplest case of rotational motion, it is very useful for many situations and is used to introduce rotational variables. When a particle is moving in a circle, the coordinate system is fixed and serves as a frame of reference to define the particle’s position. Its position vector from the origin of the circle to the particle sweeps out the angle θ, which increases in the counterclockwise direction...
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EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

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The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides...
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Imaging of the Microstructural Failure Mechanism in the Human Hip
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Properties of dynamic image displacements based on microstructure.

Peng Huang, Chuanwang He, Bin Fan

    Applied Optics
    |November 22, 2018
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    Summary

    This study presents dynamic moiré images, which shift with viewing angle and require no special eyewear. Researchers developed analytical models and experimental methods to evaluate motion effects and displacement in these unique optical patterns.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Dynamic moiré images are formed by superposing micropattern and microlens arrays.
    • These images exhibit parallax and can be viewed without special eyewear.

    Purpose of the Study:

    • To investigate the motion effects of dynamic moiré images.
    • To propose analytical models for their structure and displacement evaluation.

    Main Methods:

    • Development of analytical models for dynamic moiré image structures.
    • Formulation of methods to quantify image displacement.
    • Experimental validation of proposed displacement formulas.

    Main Results:

    • Demonstration of dynamic moiré image characteristics, including angle-dependent shifting.
    • Validation of analytical models with experimental data.
    • Establishment of a framework for understanding moiré motion.

    Conclusions:

    • The study provides a foundational understanding of dynamic moiré image motion.
    • The developed models and methods aid in the design of dynamic moiré systems.
    • Potential applications include anti-counterfeiting, packaging, and authentication technologies.