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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
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Traverse angle computations are a critical component of surveying, used to compute the internal angles within a closed traverse. A traverse consists of a series of connected lines forming a closed loop, often used for land boundary delineation or mapping. Calculating the internal angles ensures accuracy in the traverse geometry and is essential for checking survey data integrity.The process begins with known azimuths and bearings of the traverse sides. Internal angles at each vertex are...
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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Single-shot lensless imaging via simultaneous multi-angle LED illumination.

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    This study introduces a single-shot lensless imaging technique using simultaneous multi-angle LED illumination. This method accelerates imaging for dynamic samples by capturing diverse diffraction patterns in one go, overcoming previous limitations.

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    Area of Science:

    • Optics
    • Image Reconstruction
    • Computational Imaging

    Background:

    • Lensless imaging reconstructs object fields from diffraction patterns using phase retrieval.
    • Traditional lensless methods require multiple measurements, limiting dynamic sample imaging.
    • Diverse measurements (defocus, translation, varied illumination) are time-consuming.

    Purpose of the Study:

    • To develop a single-shot lensless imaging scheme for faster data acquisition.
    • To enable robust phase retrieval for dynamic samples.
    • To improve the efficiency of lensless imaging setups.

    Main Methods:

    • Simultaneous multi-angle LED illumination to record diffraction patterns in a single shot.
    • Utilizing different sensor areas for multi-angle data capture.
    • Applying an optimization algorithm for phase retrieval and reconstruction from aliased information.

    Main Results:

    • Numerical simulations validated the single-shot scheme against multi-acquisition methods.
    • Experimental validation achieved ~4.92 μm half-pitch resolution and a ~1.20 mm² field of view.
    • A 4-frame acquisition scheme demonstrated enhanced performance (~3.48 μm resolution, ~6.0 mm² FOV).

    Conclusions:

    • The proposed single-shot lensless imaging method significantly reduces acquisition time.
    • The technique is suitable for imaging dynamic samples and offers flexible performance enhancement.
    • This approach advances lensless imaging capabilities for various applications.