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Related Concept Videos

Phase Diagrams02:39

Phase Diagrams

50.5K
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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Phase Transitions02:31

Phase Transitions

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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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Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

480
Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...
480
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

424
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
424
Inductance: Single-Phase And Three-Phase Line01:28

Inductance: Single-Phase And Three-Phase Line

646
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:
A single-phase line consists of two solid cylindrical conductors, denoted as x and y. Each conductor carries phasor currents ix and iy, respectively. Given that the sum of these currents is...
646
Capacitance: Single-Phase And Three-Phase Line01:25

Capacitance: Single-Phase And Three-Phase Line

622
In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
Single-Phase Lines
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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Related Experiment Video

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Label-Free Identification of Lymphocyte Subtypes Using Three-Dimensional Quantitative Phase Imaging and Machine Learning
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Enhanced spectral-domain phase microscopy for high-sensitivity and broad-range quantitative phase imaging via joint

Jiayi Wang, Liuhang Zhao, Runnan Zhang

    Optics Letters
    |February 13, 2026
    PubMed
    Summary
    This summary is machine-generated.

    Enhanced spectral-domain phase microscopy (SDPM) overcomes limitations in quantitative phase imaging. This new method provides high-precision, bias-free phase reconstruction for broader measurement ranges in biological and industrial applications.

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    Area of Science:

    • Optical imaging
    • Metrology
    • Biophysics

    Background:

    • Spectral-domain phase microscopy (SDPM) offers high-sensitivity quantitative phase imaging.
    • Conventional SDPM struggles with phase gradients and noise, limiting measurement range due to wrap mismatches and bias.

    Purpose of the Study:

    • To introduce enhanced SDPM (eSDPM), an algorithm-hardware co-calibration framework.
    • To achieve high-precision, bias-free phase reconstruction over an extended measurement range.

    Main Methods:

    • Algorithmic improvements: explicit modeling of spectral phase endpoint terms, reference phase estimation, and wavenumber anchor determination.
    • Hardware calibration: controlled spectral truncation and boundary-wavelength calibration to minimize bias and misalignment.

    Main Results:

    • eSDPM demonstrates continuous, bias-free optical path difference reconstruction.
    • High accuracy is achieved across a broad measurement range for diverse samples.

    Conclusions:

    • eSDPM establishes a robust and practical approach for wide-range quantitative phase imaging.
    • The co-calibration framework significantly enhances the reliability and applicability of SDPM.