| magnetic reconnection | When a plasma has some resistivity, then the frozen-in flow requirement is relaxed (see frozen-in flow). In that case, the magnetic field can move through the plasma fluid on the resistive (magnetic diffusion) time scale. (Typically slow compared to magnetohydrodynamic timescales.) This allows field lines to reconnect with each other to change their topology in response to magnetic and other forces in the plasma. (see also Helicity, which is not conserved when reconnection is significant.) The predominant theory for solar flares is based on the transfer of energy from magnetic fields to plasma particles which can occur in reconnection. Reconnection can also be studied in the laboratory. (09 Oct 1997) |
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| magnetic resonance angiography | Non-invasive method of vascular imaging and determination of internal anatomy without injection of contrast media or radiation exposure. The technique is used especially in cerebral angiography as well as for studies of other vascular structures. (12 Dec 1998) |
| Magnetic Resonance Imaging | A special imaging technique used to image internal stuctures of the body, particularly the soft tissues. An MRI image is often superior to a normal X-ray image. It uses the influence of a large magnet to polarize hydrogen atoms in the tissues and then monitors the summation of the spinning energies within living cells. Images are very clear and are particularly good for soft tissue, brain and spinal cord, joints and abdomen. These scans may be used for detecting some cancers or for following their progress. Acronym: MRI (11 Nov 1997) |
| magnetic resonance imaging, cine | A type of imaging technique used primarily in the field of cardiology. By coordinating the fast gradient-echo mri sequence with retrospective ecg-gating, numerous short time frames evenly spaced in the cardiac cycle are produced. These images are laced together in a cinematic display so that wall motion of the ventricles, valve motion, and blood flow patterns in the heart and great vessels can be visualised. (12 Dec 1998) |
| magnetic resonance scanning | A special imaging technique used to image internal stuctures of the body, particularly the soft tissues. An MRI image is often superior to a normal X-ray image. It uses the influence of a large magnet to polarize hydrogen atoms in the tissues and then monitors the summation of the spinning energies within living cells. Images are very clear and are particularly good for soft tissue, brain and spinal cord, joints and abdomen. These scans may be used for detecting some cancers or for following their progress. Acronym: MRI (11 Nov 1997) |
| magnetic resonance spectroscopy | Detection and measurement of the resonant spectra of molecular species in a tissue or sample. (05 Mar 2000) |
| magnetic stress tensor | <radiobiology> A second-rank tensor, proportional to the dyadic product of the magnetic field (B) with itself. The divergence of the magnetic stress tensor gives that part of the force which a magnetic field exerts on a unit volume of conducting fluid due to the curvature of the magnetic field lines. (09 Oct 1997) |
| magnetic switching | <radiobiology> The use as switches of saturable inductors for producing high power pulses without electrical arcs. This is a principal technology for extending single-shot accelerators in light-ion-beam-driven inertial confinement fusion to repetitively pulsed devices for possible reactors. Three terawatt, 200 KJ magnetic switches have been developed for fusion drivers at Sandia National Laboratories. (Info from the 1985 OSTI Glossary of Fusion Energy, may be out of date.) (09 Oct 1997) |
| magnetic viscosity | <physics> A magnetic field in a conducting fluid will damp fluid motions perpendicular to the field lines, similar to ordinary viscosity, even in the absence of sizeable mechanical forces or electric fields. (09 Oct 1997) |
| magnetical | 1. Pertaining to the magnet; possessing the properties of the magnet, or corresponding properties; as, a magnetic bar of iron; a magnetic needle. 2. Of or pertaining to, or characterised by, the earth's magnetism; as, the magnetic north; the magnetic meridian. 3. Capable of becoming a magnet; susceptible to magnetism; as, the magnetic metals. 4. Endowed with extraordinary personal power to excite the feelings and to win the affections; attractive; inducing attachment. "She that had all magnetic force alone." (Donne) 5. Having, susceptible to, or induced by, animal magnetism, so called; as, a magnetic sleep. See Magnetism. Magnetic amplitude, attraction, dip, induction, etc. See Amplitude, Attraction, etc. Magnetic battery, a combination of bar or horseshoe magnets with the like poles adjacent, so as to act together with great power. Magnetic compensator, a contrivance connected with a ship's compass for compensating or neutralising the effect of the iron of the ship upon the needle. Magnetic curves, curves indicating lines of magnetic force, as in the arrangement of iron filings between the poles of a powerful magnet. Magnetic elements. <chemistry> Those elements, as iron, nickel, cobalt, chromium, manganese, etc, which are capable or becoming magnetic. <physics> A disturbance of the earth's magnetic force characterised by great and sudden changes. Magnetic telegraph, a telegraph acting by means of a magnet. See Telegraph. Origin: L. Magneticus: cf. F. Magnetique. Source: Websters Dictionary (01 Mar 1998) |
| magnetically | By or as by, magnetism. Source: Websters Dictionary (01 Mar 1998) |
| magnetically insulated transmission line | <radiobiology> Used to transport power efficiently in vacuum lines at very high power densities. Although the cathode is a space-charge limited electron emitter, the electron flow is confined by self-generated or applied magnetic fields. MITL's are used extensively in light-ion-driven inertial confinement fusion. (09 Oct 1997) |
| magneticalness | Quality of being magnetic. Source: Websters Dictionary (01 Mar 1998) |
| magnetician | One versed in the science of magnetism; a magnetist. Source: Websters Dictionary (01 Mar 1998) |
| magnetics | The science of magnetism. Source: Websters Dictionary (01 Mar 1998) |
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| magnetron |
a diode vacuum tube in which the flow of electrons from a central cathode to a cylindrical anode is controlled by crossed magnetic and electric fields; used mainly in microwave oscillators
Ãâó: wordnet.princeton.edu/perl/webwn
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| Magnolia |
dried bark of various magnolias; used in folk medicine any shrub or tree of the genus Magnolia; valued for their longevity and exquisite fragrant blooms
Ãâó: wordnet.princeton.edu/perl/webwn
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| magdala red |
a basic dye used for staining connective tissue. It is a mixture of monoamino- and diamino-naphthosafranins.
Ãâó: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| magnet operation |
removal of a fragment of steel or iron from the eyeball by means of a powerful magnet.
Ãâó: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| magnetic resonance imaging |
Magnetic resonance imaging (MRI) - also called magnetic resonance tomography (MRT) - is a method of creating images of the inside of opaque organs in living organisms as well as detecting the amount of bound water in geological structures. It is primarily used to demonstrate pathological or other physiological alterations of living tissues and is a commonly used form of medical imaging. ...
Ãâó: en.wikipedia.org/wiki/Magnetic_resonance_imaging
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| MAG | noble and generous in spirit |
|---|---|
| MAG | in a magnanimous manner |
| MAG | the quality of being exalted in character or ideals or conduct |
| MAG | a very wealthy or powerful businessman |
| MAG | a white solid mineral that occurs naturally as periclase |
| MAG | a black magnetic mineral consisting of magnesium carbonate |
| MAG | a light silver-white ductile bivalent metallic element |
| MAG | purgative consisting of a milky white liquid suspension of magnesium hydroxide |
| MAG | a nitride containing nitrogen and magnesium |
| MAG | a white solid mineral that occurs naturally as periclase |
| MAG | a salt of magnesium |
| MAG | a device that attracts iron and produces a magnetic field |
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