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Related Concept Videos

Phase Diagrams02:39

Phase Diagrams

50.3K
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...
611
Phase Changes01:19

Phase Changes

5.4K
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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Detecting Cosmic Reionization Using the Bispectrum Phase.

Nithyanandan Thyagarajan1,2, Chris L Carilli1,3, Bojan Nikolic3

  • 1National Radio Astronomy Observatory, Socorro, New Mexico 87801, USA.

Physical Review Letters
|July 7, 2018
PubMed
Summary
This summary is machine-generated.

Detecting neutral hydrogen (H i) during cosmic reionization is challenging due to foreground noise. A new method using bispectrum phase analysis effectively separates the H i signal, simplifying cosmic reionization studies.

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Area of Science:

  • Cosmology
  • Astrophysics
  • Radio Astronomy

Background:

  • The epoch of cosmic reionization is a crucial phase transition in the early Universe.
  • Detecting neutral hydrogen (H i) via 21 cm line emission is a key probe of this epoch.
  • Bright foreground emission poses significant challenges for current detection methods.

Purpose of the Study:

  • To propose a new method to mitigate calibration requirements for detecting H i signals.
  • To overcome challenges posed by bright foreground emission in cosmic reionization studies.
  • To enable more effective separation of the weak H i signal from foreground continuum emission.

Main Methods:

  • Utilizing measurements of the interferometric bispectrum phase.
  • Exploiting the spectral difference between the smooth foreground continuum and the cosmological H i line signal.
  • Applying Fourier techniques for signal separation, independent of antenna-based calibration errors.

Main Results:

  • The bispectrum phase is unaffected by common calibration errors, depending mainly on sky brightness distribution.
  • The bispectrum phase of foreground synchrotron continuum exhibits a smooth spectrum compared to the cosmological H i signal.
  • The H i signal is shown to be detectable in bispectrum phase spectra with reasonable significance at |k_{∥}|≳0.5h Mpc⁻¹.

Conclusions:

  • The proposed bispectrum phase analysis effectively separates the H i signal from foregrounds, reducing reliance on precise instrumental calibration.
  • This method offers a significant advancement for studying the epoch of cosmic reionization.
  • The technique is also applicable to other H i intensity mapping experiments, such as those measuring baryon acoustic oscillations (BAO).