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Related Concept Videos

Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Inductance: Single-Phase And Three-Phase Line01:28

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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.
Single-Phase Two-Wire Line:
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Capacitance: Single-Phase And Three-Phase Line01:25

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In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
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Consider a single-phase, two-wire transmission line with equal phase spacing energized by a voltage source. One conductor carries a uniform positive charge, while the other carries an equal negative charge. The capacitance C of the line can be derived from the voltage V between the conductors. For a one-meter section of the line, the capacitance is given...
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Phase Changes01:19

Phase Changes

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Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
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Phase-lead and Phase-lag Controllers01:22

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Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
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Updated: Jan 27, 2026

Multimodal Quantitative Phase Imaging with Digital Holographic Microscopy Accurately Assesses Intestinal Inflammation and Epithelial Wound Healing
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Digital holographic phase imaging based on phase iteratively enhanced compressive sensing.

Zhenpeng Luo, Jianshe Ma, Ping Su

    Optics Letters
    |March 16, 2019
    PubMed
    Summary
    This summary is machine-generated.

    A new phase iteratively enhanced compressive sensing (PIE-CS) algorithm enables simultaneous phase imaging and elimination of defocused images in digital holography. This method successfully recovers amplitude and phase from multilayer samples with minimal measurements, proving its feasibility for quantitative phase imaging (QPI).

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    Area of Science:

    • Optics and Photonics
    • Image Processing
    • Biomedical Imaging

    Background:

    • Digital holography is effective for quantitative phase imaging (QPI) of single-layer objects.
    • Existing compressive sensing methods for multilayer imaging remove defocused images but lose phase information.

    Purpose of the Study:

    • To develop a novel algorithm for simultaneous phase imaging and defocused image elimination in digital holography.
    • To enable accurate QPI of multilayer objects using compressive sensing.

    Main Methods:

    • A phase iteratively enhanced compressive sensing (PIE-CS) algorithm was proposed.
    • Linear filtering in the Fourier domain was used to obtain an intermediate complex image.
    • A periodic phase mask was applied iteratively to eliminate defocused images and recover phase information.

    Main Results:

    • The PIE-CS algorithm successfully recovered both amplitude and phase from a two-layer sample.
    • Effective reconstruction was achieved with as little as 7% random measurements.
    • Analysis showed the average phase error, demonstrating the algorithm's feasibility for QPI.

    Conclusions:

    • The proposed PIE-CS algorithm effectively performs quantitative phase imaging on multilayer samples.
    • This method overcomes limitations of traditional compressive sensing by preserving phase information.
    • PIE-CS offers a robust solution for advanced holographic imaging applications.