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nuclear magnetic resonance |
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nuclear magnetic resonance: see magnetic resonance magnetic resonance, in physics and chemistry, phenomenon produced by simultaneously applying a steady magnetic field and electromagnetic radiation (usually radio waves) to a sample of atoms and then adjusting the frequency of the radiation and the strength of the ..... Click the link for more information. . nuclear magnetic resonance (NMR)Selective absorption of very high-frequency radio waves by certain atomic nuclei subjected to a strong stationary magnetic field. Nuclei that have at least one unpaired proton or neutron act like tiny magnets. When a strong magnetic field acts on such nuclei, it sets them into precession. When the natural frequency of the precessing nuclear magnets corresponds to the frequency of a weak external radio wave striking the material, energy is absorbed by the nuclei at a frequency called the resonant frequency. NMR is used to study the molecular structure of various solids and liquids. Magnetic resonance imaging, or MRI, is a version of NMR used in medicine to view soft tissues of the human body in a hazard-free, noninvasive way. nuclear magnetic resonance [′nü·klē·ər mag′ned·ik ′rez·ən·əns] (physics) A phenomenon exhibited by a large number of atomic nuclei, in which nuclei in a static magnetic field absorb energy from a radio-frequency field at certain characteristic frequencies. Abbreviated NMR. Also known as magnetic nuclear resonance. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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They and related nuclear magnetic resonance (NMR) instruments for chemical analysis require that a patient or sample come to a lab or clinic and squeeze into the inner recesses of a machine. The international team analyzed flocs from nine polluted streams in Germany and California using a type of nuclear magnetic resonance spectroscopy called [sup. Several presentations were made on new technologies that potentially could be used for these applications such as infrared sensors, nuclear magnetic resonance, fiber optic sensors, and algorithms that can be incorporated in sensors to predict the onset of damage. |
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