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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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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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Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

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Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
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Inductance: Single-Phase And Three-Phase Line01:28

Inductance: Single-Phase And Three-Phase Line

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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:
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...
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Capacitance: Single-Phase And Three-Phase Line01:25

Capacitance: Single-Phase And Three-Phase Line

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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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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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Updated: Jan 27, 2026

Author Spotlight: Characterizing Environmental Biofilm Mechanics Using Optical Coherence Elastography and its Applications in Wastewater Treatment
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Analysis of spatial resolution in phase-sensitive compression optical coherence elastography.

Matt S Hepburn1,2, Philip Wijesinghe1,2,3, Lixin Chin1,2

  • 1BRITElab, Harry Perkins Institute of Medical Research, QEII Medical Centre, Nedlands, Western Australia, 6009, Australia and Centre for Medical Research, The University of Western Australia, Crawley, Western Australia, 6009, Australia.

Biomedical Optics Express
|March 21, 2019
PubMed
Summary
This summary is machine-generated.

We developed a new framework to analyze the spatial resolution of optical coherence elastography (OCE), a microscale tissue imaging technique. Our findings show that OCE resolution varies with sample properties and feature size, crucial for advancing this technology.

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Area of Science:

  • Biomedical Optics
  • Tissue Mechanics
  • Medical Imaging

Background:

  • Optical coherence elastography (OCE) images microscale tissue mechanical properties.
  • Spatial resolution, a key OCE advantage, remains under-investigated and difficult to quantify.
  • Existing methods lack a comprehensive analysis of resolution determinants.

Purpose of the Study:

  • To present a novel framework for analyzing spatial resolution in phase-sensitive compression OCE.
  • To investigate the factors influencing resolution in OCE.
  • To establish a basis for improving OCE image formation and development.

Main Methods:

  • Developed a framework integrating sample deformation, OCT detection, and signal processing for strain estimation.
  • Utilized structured phantoms for controlled experiments and simulations.
  • Correlated experimental results with simulation data to validate the framework.

Main Results:

  • Demonstrated that compression OCE resolution is spatially varying and sample-dependent.
  • Linked resolution variations to discrepancies between elasticity models and actual sample deformation.
  • Showed resolution is influenced by feature size and mechanical contrast.

Conclusions:

  • The developed framework provides a method to analyze and understand OCE resolution.
  • Resolution is not uniform and depends on specific sample characteristics.
  • This analysis can accelerate the advancement and application of compression OCE.