scanning | the act of systematically moving a finely focused beam of light or electrons over a surface in order to produce an image of it for analysis or transmission |
magnetic resonance imaging MRI | the use of nuclear magnetic resonance of protons to produce proton density images |
functional magnetic resonance imaging fMRI | a form of magnetic resonance imaging of the brain that registers blood flow to functioning areas of the brain |
blood-oxygenation level dependent functional magnetic resonance imaging BOLD FMRI | functional magnetic resonance imaging that relies on intrinsic changes in hemoglobin oxygenation |
magnetic levitation maglev | high-speed rail technology, train is suspended on a magnetic cushion above a magnetized track and so travels free of friction |
core magnetic core | (computer science) a tiny ferrite toroid formerly used in a random access memory to store one bit of data, now superseded by semiconductor memories, each core has three wires passing through it, providing the means to select and detect the contents of each bit |
magnetic bottle | container consisting of any configuration of magnetic fields used to contain a plasma during controlled thermonuclear reactions |
magnetic bubble memory | a nonvolatile storage device that holds information in the form of bubbles on a thin film of magnetic silicate, no longer used in most computers |
magnetic compass | compass based on an indicator (as a magnetic needle) that points to the magnetic north |
magnetic core memory core memory | (computer science) a computer memory consisting of an array of magnetic cores, now superseded by semiconductor memories |
magnetic disk magnetic disc disk disc | (computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored |
magnetic head | an electromagnet (as on a tape recorder) that converts electrical variations into magnetic variations that can be stored on a surface and later retrieved |
magnetic mine | (nautical) a marine mine that is detonated by a mechanism that responds to magnetic material (as the steel hull of a ship) |
magnetic needle | a slender magnet suspended in a magnetic compass on a mounting with little friction, used to indicate the direction of the earth's magnetic pole |
magnetic recorder | recorder consisting of equipment for making records on magnetic media |
magnetic stripe | a short strip of magnetic tape attached to a credit card or debit card, it contains data that will tell a reading device who you are and what your account number is, etc. |
magnetic tape mag tape tape | memory device consisting of a long thin plastic strip coated with iron oxide, used to record audio or video signals or to store computer information, he took along a dozen tapes to record the interview |
negative magnetic pole negative pole south-seeking pole | the pole of a magnet that points toward the south when the magnet is suspended freely |
pole magnetic pole | one of the two ends of a magnet where the magnetism seems to be concentrated |
positive pole positive magnetic pole north-seeking pole | the pole of a magnet that points toward the north when the magnet is suspended freely |
magnetic field strength magnetic intensity magnetic induction magnetic flux density | the amount of magnetic flux in a unit area perpendicular to the direction of magnetic flow |
magnetic storage medium magnetic medium magnetic storage | any storage medium in which different patterns of magnetization are used to represent stored bits or bytes of information, the hard disk in you computer is magnetic storage |
finger scan finger scanning | biometric identification by automatically scanning a person's fingerprints electronically |
iris scanning | biometric identification by scanning the iris of the eye, the structure of the iris is very distinctive |
retinal scanning | biometric identification by scanning the retina of the eye, identification by retinal scanning is complicated by eye movements |
magnetic storm | a sudden disturbance of the earth's magnetic field, caused by emission of particles from the sun |
aclinic line magnetic equator | an imaginary line paralleling the equator where a magnetic needle has no dip |
magnetic pole | either of two points where the lines of force of the Earth's magnetic field are vertical |
magnetic meridian | an imaginary line passing through both magnetic poles of the Earth |
magnetic dipole | a dipole with opposing magnetic poles |
magnetic monopole | a hypothetical particle with a single magnetic pole instead of the usual two |
magnetic line of force | a line of force in a magnetic field |
solar magnetic field | the magnetic field of the sun |
magnetic field magnetic flux flux | the lines of force surrounding a permanent magnet or a moving charged particle |
magnetic resonance | resonance of electrons or atoms or molecules or nuclei to radiation frequencies as a result of space quantization in a magnetic field |
nuclear magnetic resonance NMR proton magnetic resonance | resonance of protons to radiation in a magnetic field |
magnetism magnetic attraction magnetic force | attraction for iron, associated with electric currents as well as magnets, characterized by fields of force |
magnetic dipole moment | (physics) a current loop gives rise to a magnetic field characteristic of a magnetic dipole, An orbiting electron in an atom will have a magnetic dipole moment |
magnetic moment moment of a magnet | the torque exerted on a magnet or dipole when it is placed in a magnetic field |
magnetization magnetisation magnetic induction | the process that makes a substance magnetic (temporarily or permanently) |
scanning | the process of translating photographs into a digital form that can be recognized by a computer |
magnetic flux | a measure of the strength of a magnetic field over a given area |
flux unit magnetic flux unit | a measure of the strength of a magnetic field per unit area |
north magnetic north compass north | the direction in which a compass needle points |
dip angle of dip magnetic dip magnetic inclination inclination | (physics) the angle that a magnetic needle makes with the plane of the horizon |
magnetic declination magnetic variation variation | the angle (at a particular location) between magnetic north and true north |
pyrrhotite pyrrhotine magnetic pyrites | a brownish iron sulfide mineral (FeS) having weak magnetic properties |
magnetic ink | an ink that contains particles of a magnetic substance whose presence can be detected by magnetic sensors |
magnetite magnetic iron-ore | an oxide of iron that is strongly attracted by magnets |
charismatic magnetic | possessing an extraordinary ability to attract, a charismatic leader, a magnetic personality |