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Related Concept Videos

Prismatic Beams: Problem Solving01:15

Prismatic Beams: Problem Solving

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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

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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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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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Principal Stresses in a Beam01:11

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In prismatic beams subject to arbitrary transverse loading, It is essential to analyze the interaction between shear forces and bending moments in order to understand stress distribution and ensure structural integrity. The highest normal or bending stress occurs at the outer fibers of the beam, decreasing linearly to zero at the neutral axis. In contrast, shear stress peaks at the neutral axis and diminishes toward the outer surfaces.
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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Inverted pin beams for robust long-range propagation through atmospheric turbulence.

Sotiris Droulias, Michalis Loulakis, Dimitris G Papazoglou

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    We introduce novel "inverted pin" optical beams. These beams show superior performance in turbulent environments compared to Gaussian and regular pin beams, especially in moderate to strong fluctuations.

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    Area of Science:

    • Optics and Photonics
    • Beam Propagation
    • Turbulence Effects

    Background:

    • Gaussian beams and Bessel beams are standard for optical applications.
    • Turbulence degrades beam quality, impacting performance.
    • Optimized beams are crucial for robust optical communication and sensing.

    Purpose of the Study:

    • Introduce a new class of optical beams: inverted pin beams.
    • Analyze the propagation characteristics of inverted pin beams in turbulent media.
    • Compare the performance of inverted pin beams against established beam types.

    Main Methods:

    • Asymptotic analysis to determine the transverse amplitude profile near the axis.
    • Numerical simulations to study beam behavior in turbulent environments.
    • Scintillation index used as a metric for performance evaluation.

    Main Results:

    • Inverted pin beams exhibit a Bessel function profile that expands during propagation.
    • These beams demonstrate significantly reduced scintillation compared to Gaussian and regular pin beams.
    • Performance enhancement is particularly notable in moderate and strong turbulence regimes.

    Conclusions:

    • Inverted pin beams represent a promising new tool for optical applications in atmospheric turbulence.
    • Their unique profile offers enhanced resilience against turbulence-induced intensity fluctuations.
    • Further research into their generation and application is warranted.