Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

663
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
663
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

700
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
700
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

657
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
657
Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

1.4K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
1.4K
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

1.1K
NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
1.1K
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.1K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Protective Role of the EGR1-Nudt16L1 Pathway in Spermatogonial Stem Cells Against Testicular Ischemia-Reperfusion Injury.

Cell biology international·2026
Same author

Magnetic anomaly detection method based on principal component analysis and cascaded stochastic resonance.

The Review of scientific instruments·2026
Same author

Study on DNA Damage Gene in Spermatogonial Stem Cells from Idiopathic Nonobstructive Azoospermia: A Bioinformatics Investigation Based on scRNA-seq Data.

Cytogenetic and genome research·2025
Same author

NOX4 modulates breast cancer progression through cancer cell metabolic reprogramming and CD8<sup>+</sup> T cell antitumor activity.

Frontiers in immunology·2025
Same author

The impact of tertiary lymphoid structures on tumor prognosis and the immune microenvironment in non-small cell lung cancer.

Scientific reports·2024
Same author

Estimation of soil organic carbon in LUCAS soil database using Vis-NIR spectroscopy based on hybrid kernel Gaussian process regression.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy·2024

Related Experiment Video

Updated: Jul 8, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

9.6K

A stochastic resonance etection algorithm based on orthonormalized basis function for magnetic anomaly detection.

Fan Dai1, Dongliang Peng1, Zhikun Chen1

  • 1School of Automation, Hangzhou Dianzi University, Hangzhou 310018, China.

The Review of Scientific Instruments
|December 18, 2023
PubMed
Summary
This summary is machine-generated.

A new airborne magnetic anomaly detection (MAD) algorithm, orthonormalized basis function-stochastic resonance (OBF-SR), improves detection performance in noisy conditions. This method enhances detection probability and range compared to existing techniques.

More Related Videos

Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking
07:21

Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking

Published on: February 12, 2011

14.3K
Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
09:43

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

9.5K

Related Experiment Videos

Last Updated: Jul 8, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

9.6K
Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking
07:21

Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking

Published on: February 12, 2011

14.3K
Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
09:43

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement

Published on: November 7, 2017

9.5K

Area of Science:

  • Geophysics
  • Signal Processing

Background:

  • Airborne magnetic anomaly detection (MAD) performance is significantly degraded by low signal-to-noise ratio (SNR) conditions.
  • Existing detection algorithms struggle to effectively identify magnetic anomalies in noisy environments.

Purpose of the Study:

  • To propose a novel stochastic resonance (SR) detection algorithm, termed OBF-SR, specifically designed for MAD under low SNR.
  • To enhance the detection probability and range of airborne magnetic anomaly detection systems.

Main Methods:

  • Preprocessing of noisy signals using the orthonormalized basis function (OBF) method.
  • Utilizing the sum of three OBF space components as the input for the SR system.
  • Designing a parallel SR system with varied initial states for signal detection.

Main Results:

  • The OBF-SR method demonstrated superior performance compared to standard SR and OBF methods.
  • Significant improvements in detection probability were observed.
  • An extended detection range was achieved under identical low SNR conditions.

Conclusions:

  • The OBF-SR algorithm offers a substantial advancement for airborne magnetic anomaly detection in challenging, low SNR environments.
  • This approach effectively overcomes the limitations of traditional SR and OBF methods for MAD.