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Understanding the inductance of transmission lines is crucial for efficient design and operation in electrical power systems. This discussion delves into the inductance characteristics of single-phase two-wire and three-phase three-wire transmission lines with equal phase spacing.
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    We developed a fast, single-shot quantitative phase imaging (QPI) method using color-multiplexed Fourier ptychographic microscopy (FPM). This technique accurately images dynamic biological processes like cell mitosis with high resolution and a wide field of view.

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    Area of Science:

    • Optical microscopy
    • Quantitative phase imaging
    • Fourier ptychographic microscopy

    Background:

    • Quantitative phase imaging (QPI) is crucial for label-free cell imaging.
    • Traditional QPI methods can be slow or have limited resolution.
    • Fourier ptychographic microscopy (FPM) offers high resolution but often requires multiple illumination steps.

    Purpose of the Study:

    • To develop a single-shot, high-speed QPI method.
    • To enhance phase recovery accuracy and overcome limitations of existing techniques.
    • To demonstrate the method's capability for imaging dynamic biological processes.

    Main Methods:

    • Color-multiplexed Fourier ptychographic microscopy (FPM) using a programmable RGB LED array for simultaneous oblique illumination.
    • Acquisition of three monochromatic intensity images from a single color sensor.
    • Phase recovery through deconvolution and an iterative FPM-based refinement algorithm.

    Main Results:

    • Achieved single-shot quantitative phase imaging.
    • Demonstrated high-speed imaging at 50 frames per second.
    • Obtained a resolution of 388 nm over a 1.33 mm² field of view.
    • Successfully imaged HeLa cells during mitosis in vitro.

    Conclusions:

    • The proposed color-multiplexed FPM method enables high-speed, high-throughput QPI.
    • This technique overcomes pixel-aliasing and improves phase recovery accuracy.
    • It is suitable for observing dynamic biological events with high spatial resolution.