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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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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.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
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Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

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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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Implementation of a Reference Interferometer for Nanodetection
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Three Phase-Grating Moiré Neutron Interferometer for Large Interferometer Area Applications.

D Sarenac1,2, D A Pushin1,2, M G Huber3

  • 1Department of Physics, University of Waterloo, Waterloo, Ontario, Canada N2L3G1.

Physical Review Letters
|March 31, 2018
PubMed
Summary
This summary is machine-generated.

A novel three phase-grating moiré neutron interferometer offers a robust method for large-area neutron interferometry and material characterization. This technique overcomes limitations of perfect crystal interferometers, enabling new experiments.

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Area of Science:

  • Neutron Optics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Perfect crystal neutron interferometers face limitations in scalability and alignment.
  • Developing robust neutron interferometers is crucial for advanced material characterization and fundamental physics experiments.

Purpose of the Study:

  • To demonstrate a novel three phase-grating moiré neutron interferometer for large-area applications.
  • To assess the potential of this technique for material characterization and fundamental constant measurements.

Main Methods:

  • Utilized a three phase-grating moiré setup in a high-intensity neutron beam.
  • Employed a far-field moiré technique with broad wavelength acceptance.
  • Investigated the effect of an aluminum 6061 alloy sample on system coherence.

Main Results:

  • Successfully observed interference fringes with a 4-meter long interferometer.
  • Demonstrated the feasibility of the moiré technique for neutron interferometry.
  • Characterized the coherence effects induced by an aluminum alloy sample.

Conclusions:

  • The three phase-grating moiré neutron interferometer is a promising candidate for large-area applications.
  • This technique relaxes fabrication and alignment constraints compared to traditional methods.
  • Future experiments can leverage this interferometer for sample autocorrelation length and gravitational constant measurements.