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Related Concept Videos

Sound Waves: Interference00:53

Sound Waves: Interference

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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Interference and Superposition of Waves01:07

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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
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Interference and Diffraction02:18

Interference and Diffraction

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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Interference: Path Lengths01:10

Interference: Path Lengths

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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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Geoacoustic inversion using very-low-frequency modal interference characteristics.

Shengchun Piao1, Yang Dong1, Zhiqiang Wu2

  • 1National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China.

JASA Express Letters
|June 13, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a new geoacoustic inversion method for very-low-frequency leaky waveguides using seismic air gun data. The technique accurately models seabed properties and basement interface reflections, aligning with geological findings.

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Area of Science:

  • Geophysics
  • Ocean Acoustics
  • Seismic Exploration

Background:

  • Geoacoustic inversion is crucial for understanding seabed properties.
  • Very-low-frequency (VLF) waveguides present unique challenges for acoustic analysis.
  • Seismic exploration data offers valuable insights into sub-seabed structures.

Purpose of the Study:

  • To develop and apply a modal-based geoacoustic inversion method for VLF leaky waveguides.
  • To analyze air gun seismic data from the South Yellow Sea.
  • To infer effective seabed models and validate them against geological data.

Main Methods:

  • Modal-based geoacoustic inversion.
  • Filtering of waterborne and bottom-trapped acoustic modes.
  • Comparison of modal interference features (waveguide invariant) with replica fields.
  • Application to multi-channel seismic exploration data.

Main Results:

  • Effective seabed models were inferred at two distinct locations.
  • Calculated two-way travel times for basement interface reflections showed strong agreement with geological exploration results.
  • The modal-based inversion method proved effective for VLF leaky waveguides.

Conclusions:

  • The proposed modal-based geoacoustic inversion method is suitable for VLF leaky waveguides.
  • Accurate seabed characterization and basement interface detection are achievable.
  • The method validates well against existing geological exploration data.