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Related Concept Videos

Directional Relays01:25

Directional Relays

85
Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Direction Cosines of a Vector01:29

Direction Cosines of a Vector

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Direction cosines, which help describe the orientation of a vector with respect to the coordinate axes, are an essential concept in the field of vector calculus. Consider vector A that is expressed in terms of the Cartesian vector form using i, j, and k unit vectors. The magnitude of vector A is defined as the square root of the sum of the squares of its components. The direction of this vector with respect to the x, y, and z axes is defined by the coordinate direction angles α, β, and γ,...
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Clipper Circuit01:18

Clipper Circuit

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A clipper circuit is a fundamental wave-shaping device that harnesses the unique properties of diodes to alter and control waveform characteristics. This technology is widely used in electronic devices, especially in television and radar communication systems, where it enhances waveform modulation in both transmitters and receivers.
The operation of a clipper circuit can be exemplified by analyzing a dual-clipper configuration setup that integrates two ideal diodes, each paired with a biasing...
328
One-Degree-of-Freedom System01:24

One-Degree-of-Freedom System

446
In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...
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Magnetic Damping01:17

Magnetic Damping

408
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
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Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Related Experiment Video

Updated: May 22, 2025

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Inverse-designed multi-directional remote cloak.

Qingze Tan, Chao Qian, Zheng Zhen

    Optics Letters
    |March 14, 2025
    PubMed
    Summary

    Researchers developed a novel remote invisibility cloak using metamaterials. This open cloak design allows hidden objects to interact with their surroundings, unlike traditional cloaks, enabling practical applications.

    Area of Science:

    • Metamaterials and Optics
    • Electromagnetism and Wave Phenomena

    Background:

    • Invisibility cloaks are desirable for self-protection but current designs restrict object interaction.
    • Existing cloaking technologies require complete object envelopment, limiting practical use.

    Purpose of the Study:

    • To develop a high-performance, fabricable remote invisibility cloak with simple parameters.
    • To overcome the limitations of traditional cloaks by enabling interaction with the environment.

    Main Methods:

    • Utilized a precise de-homogenization optimized-architecture for cloak design.
    • Constructed an open cloak from four separate metamaterial parts.
    • Demonstrated remote cloaking for arbitrarily shaped objects and multiple wave directions.

    Main Results:

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    • Successfully demonstrated a remote cloak capable of hiding objects without complete wrapping.
    • The open cloak functions for arbitrarily shaped objects at a distance.
    • Validated cloaking for four mutually orthogonal directions of incident waves.

    Conclusions:

    • The developed remote cloak offers a new strategy for invisibility applications.
    • This technology advances the potential for widespread, practical, in situ applications.
    • The design allows for remote cloaking without geometric constraints, enhancing versatility.