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Related Concept Videos

Displacement Current01:19

Displacement Current

3.8K
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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Plastic Deformations01:19

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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Plastic Deformations01:14

Plastic Deformations

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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Position and Displacement Vectors01:00

Position and Displacement Vectors

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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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Compression optical coherence elastography with two-dimensional displacement measurement and local deformation

En Li, Shuichi Makita, Shinnosuke Azuma

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    This summary is machine-generated.

    This study introduces a new optical coherence elastography (OCE) method to measure axial and lateral tissue displacement and microstructural changes. This advanced technique offers high-contrast mechanical property imaging for better tissue analysis.

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    Area of Science:

    • Biomedical Optics
    • Medical Imaging
    • Biophysics

    Background:

    • Current compression-based optical coherence elastography (OCE) primarily measures axial tissue displacement.
    • Lateral displacement and microstructural alterations during compression are often unmeasured, limiting comprehensive tissue mechanical analysis.

    Purpose of the Study:

    • To develop and demonstrate a novel compression-based OCE method capable of visualizing axial displacement, lateral displacement, and microstructural decorrelation (MSD).
    • To enhance mechanical property imaging of tissues using advanced OCE techniques.

    Main Methods:

    • Implementation of a swept-source optical coherence tomography (SS-OCT) system with active submicrometer compression.
    • Utilizing complex correlation-based algorithms for simultaneous measurement of axial and lateral displacements and MSD.
    • Application of the method to biological tissues, specifically porcine carotid artery and esophagus.

    Main Results:

    • The new OCE method successfully visualized both significant axial and lateral displacements in compressed tissues.
    • Microstructural decorrelation (MSD) mapping provided high-contrast imaging of tissue mechanical properties.
    • Demonstrated the feasibility of the technique in complex biological samples.

    Conclusions:

    • The developed OCE method provides a more comprehensive assessment of tissue mechanics by quantifying axial and lateral displacements and microstructural changes.
    • This technique offers potential for improved high-contrast mechanical property imaging in biomedical applications.
    • The findings advance the capabilities of OCE for detailed tissue characterization.