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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
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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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Hollow-core terahertz Bragg waveguide based on a helical support structure.

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    PubMed
    Summary
    This summary is machine-generated.

    A new helical support structure for hollow-core terahertz Bragg waveguides was developed using 3D printing. This design achieves low transmission loss, comparable to ideal waveguides, for terahertz applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Terahertz Technology

    Background:

    • Hollow-core Bragg waveguides are crucial for terahertz (THz) applications.
    • Mechanical support for dielectric layers in these waveguides is challenging.
    • Existing support methods can introduce significant signal loss.

    Purpose of the Study:

    • To propose and validate a novel helical structural support scheme for dielectric layers in hollow-core terahertz Bragg waveguides.
    • To investigate the impact of helical support on waveguide performance, particularly transmission loss.
    • To demonstrate the feasibility of 3D printing for fabricating such complex waveguide structures.

    Main Methods:

    • A helical wrap-around strip structure was designed to mechanically support dielectric layers.
    • Waveguide samples were fabricated using advanced 3D printing technology.
    • Terahertz time-domain spectroscopy was employed to experimentally test the fabricated waveguide samples.

    Main Results:

    • The helical-strip supported waveguide samples were successfully fabricated.
    • Experimental testing demonstrated low transmission loss, below 0.097 dB/m.
    • Optimal helix periods were found to yield loss characteristics close to ideal Bragg waveguides.
    • The operational frequency range for low loss was identified as 0.57-0.58 THz.

    Conclusions:

    • The proposed helical structural support scheme effectively supports dielectric layers in hollow-core terahertz Bragg waveguides.
    • 3D printing is a viable technology for fabricating these specialized waveguides.
    • The helical support design enables low-loss terahertz wave transmission, crucial for future THz devices.