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Related Concept Videos

Deflection of a Beam01:19

Deflection of a Beam

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Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
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Shear on the Horizontal Face of a Beam Element01:16

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To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
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Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

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The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
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Prismatic Beams: Problem Solving01:15

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In the design of a supported timber beam subjected to a distributed load, both the beam's physical dimensions and the timber's characteristics, such as its grade and species, are critical. These factors determine the allowable stress values, which are crucial for calculating the necessary beam depth to ensure structural integrity and safety.
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Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

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Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
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Moiré metasurface for dynamically tuned vector beams.

Changke Bu, Wen Xing, Wenjing Yue

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    Summary
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    Researchers developed a new method to dynamically tune vector beam (VB) polarization order using a silicon Moiré metasurface. This breakthrough offers reconfigurable functionalities in meta-optics and photonics applications.

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    Area of Science:

    • Photonics
    • Meta-optics
    • Optical Engineering

    Background:

    • Vector beams (VB) possess spatially non-uniform polarization, offering significant potential in photonics.
    • Current metasurface-based VB manipulation often lacks dynamic control over polarization order.

    Purpose of the Study:

    • To propose and validate a general and facile method for dynamically tuning the polarization order of vector beams.
    • To demonstrate reconfigurable functionalities in meta-optics.

    Main Methods:

    • Utilized a silicon-based Moiré metasurface operating in the visible band.
    • Leveraged continuous phase tunability of the Moiré effect to tailor topological charges of focused vortex beams.
    • Incorporated geometric phase to generate two vortex beams with opposite topological charges.

    Main Results:

    • Successfully generated a vector beam (VB) with dynamically tunable polarization order by superposing two vortex beams under linear polarization incidence.
    • Demonstrated dynamic tuning of VB polarization order through metasurface rotation.
    • Validated the method in the visible spectral band.

    Conclusions:

    • The proposed method provides a novel approach for dynamic control of vector beam polarization order.
    • This technique opens promising avenues for reconfigurable meta-optics and advanced photonic devices.