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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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Fixed Action Patterns01:06

Fixed Action Patterns

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A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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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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Cell Co-culture Patterning Using Aqueous Two-phase Systems
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Phase-sensitive interferometry of decorrelated speckle patterns.

Hendrik Spahr1,2, Clara Pfäffle1,2, Sazan Burhan1

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Phase-sensitive imaging can now overcome challenges from moving tissues. A new method allows phase comparison between decorrelated images, enabling clearer biological imaging.

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Area of Science:

  • Coherent imaging
  • Biomedical optics
  • Phase-sensitive techniques

Background:

  • Phase-sensitive coherent imaging uses light phase changes to detect subtle structural or refractive index variations.
  • Moving scatterers and refractive index fluctuations cause decorrelation, scrambling image phases and hindering biological specimen imaging.
  • Current methods struggle with diffusion and tissue motion, limiting phase-sensitive imaging applications.

Purpose of the Study:

  • To demonstrate that phase comparison is possible even with decorrelated speckle patterns.
  • To introduce a novel evaluation scheme for phase-sensitive imaging applicable to biological tissues.
  • To adapt speckle interferometry principles for enhanced biological imaging.

Main Methods:

  • Utilizing a series of images acquired during the decorrelation process.
  • Applying a mathematical evaluation scheme analogous to astronomical speckle interferometry.
  • Testing the method with simulated data and phase-sensitive optical coherence tomography of photoreceptor activity.

Main Results:

  • Successfully enabled phase comparison between decorrelated speckle patterns.
  • Demonstrated the efficacy of the speckle interferometry approach in simulated and biological data.
  • Showcased the potential for imaging dynamic biological processes like photoreceptor activity.

Conclusions:

  • The developed method overcomes phase scrambling caused by motion and diffusion.
  • Speckle interferometry principles can be effectively applied to phase-sensitive biological imaging.
  • The technique holds promise for various interferometric imaging modalities in life sciences.