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Hand hygiene01:23

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Asepsis is the practice of preventing or breaking the chain of infection. The nurse employs aseptic techniques to prevent the spread of microorganisms and reduce the risk of diseases. Hand hygiene is the cornerstone of aseptic techniques and is classified into medical and surgical asepsis. Medical asepsis includes hand hygiene and the use of gloves. Surgical asepsis, or the sterile technique, refers to practices that render and keep objects and areas free of microorganisms.
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The setting time of cement refers to the process of cement paste transitioning from a plastic state to a solid state. This process is crucial in construction as it dictates the timeframe for concrete placement, compaction, and finishing. The onset of this solidification is termed the initial set, indicating when the paste becomes unworkable. The final set is when the paste has solidified completely, and further handling or manipulation can no longer affect its shape. The cement strength is...
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Related Experiment Video

Updated: Jan 27, 2026

Hand-held Clinical Photoacoustic Imaging System for Real-time Non-invasive Small Animal Imaging
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Hand-held aperture-sharing camera for a multiview image set.

Jung-Young Son, Jaesoon Kim, Do-Hyung Kim

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |March 16, 2019
    PubMed
    Summary
    This summary is machine-generated.

    A novel hand-held camera captures full parallax multiview images using a liquid crystal (LC) shutter array. This innovative design simplifies manufacturing for advanced light field imaging applications.

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    Determining 3D Flow Fields via Multi-camera Light Field Imaging
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    Determining 3D Flow Fields via Multi-camera Light Field Imaging

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    Area of Science:

    • Optics and Photonics
    • Image Acquisition Technology
    • Computational Imaging

    Background:

    • Multiview imaging systems are crucial for applications like 3D reconstruction and light field photography.
    • Existing multiview camera arrays can be complex and costly to manufacture.
    • Achieving full parallax and high resolution simultaneously presents a significant technical challenge.

    Purpose of the Study:

    • To introduce a novel, easily manufacturable hand-held camera for acquiring full parallax multiview images.
    • To demonstrate a new method for spatial sharing of the aperture stop using a liquid crystal shutter array.
    • To evaluate the camera's suitability for light field imaging applications.

    Main Methods:

    • Development of a hand-held camera incorporating a 2D high-speed liquid crystal (LC) shutter array (8x8 shutters).
    • Spatial sharing of the camera's aperture stop by the LC shutter array to acquire 8x8 multiview images.
    • Analysis of the optical configuration, image disparity, and depth resolution characteristics.

    Main Results:

    • The camera successfully acquires full parallax multiview images with full detector resolution.
    • The optical configuration is equivalent to a parallel-type multiview camera array.
    • The calculated depth resolution and number of depth layers are consistent with experimental findings and suitable for light field imaging.

    Conclusions:

    • The developed hand-held camera offers a simplified manufacturing approach for full parallax multiview image acquisition.
    • The use of a liquid crystal shutter array enables efficient spatial sharing of the aperture stop.
    • This technology holds promise for advancing light field imaging and 3D sensing.