| NA | Avogadro constant or number; nalidixic acid; Narcotics Anonymous; network administrator; neuraminida... |
|---|---|
| ACS | acrocallosal syndrome; acrocephalosyndactyly; acute chest syndrome; acute confusional state; Alcon C... |
| APC | acetylsalicylic acid, phenacetin, and caffeine; activated protein C; adenoidal-pharyngeal-conjunctiv... |
| L/N | letter/numerical [system] |
| NRS | neurobehavioral rating scale; normal rabbit serum; normal reference serum; numerical rating scale |
| N.A. | numerical aperture |
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| NRS | Numerical Rating Scale |
| TACT | Tuned Aperture Computed Tomography |
| numerical aperture | For a lens the resolving power depends upon the wavelength of light being used and inversely upon the numerical aperture. The N.A. Is the product of the refractive index of the medium (1 for air, 1.5 for immersion oil) and the sine of the angle, i, the semi angle of the cone formed by joining objects to the perimeter of the lens. The larger the value of N.A., the better the resolving power of the lens, most objectives have their N.A. Value engraved on the barrel and this should be quoted when describing an optical system. (18 Nov 1997) |
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| numerical | 1. Belonging to number; denoting number; consisting in numbers; expressed by numbers, and not letters; as, numerical characters; a numerical equation; a numerical statement. Numerical, as opposed to algebraical, is used to denote a value irrespective of its sign; thus, -5 is numerically greater than -3, though algebraically less. 2. The same in number; hence, identically the same; identical; as, the same numerical body. "Would to God that all my fellow brethren, which with me bemoan the loss of their books, . . . Might rejoice for the recovery thereof, though not the same numerical volumes. <mathematics>" (Fuller) Numerical equation, an equation which has all the quantities except the unknown expressed in numbers; distinguished from literal equation. Numerical value of an equation or expression, that deduced by substituting numbers for the letters, and reducing. Origin: Cf. F. Numerique. See Number. Source: Websters Dictionary (01 Mar 1998) |
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| numerical analysis, computer-assisted | Computer-assisted study of methods for obtaining useful quantitative solutions to problems that have been expressed mathematically. (12 Dec 1998) |
| numerical hypertrophy | <pathology> The abnormal multiplication or increase in the number of normal cells in normal arrangement in a tissue. Compare: hypertrophy. Origin: Gr. Plasis = formation (18 Nov 1997) |
| numerical notation for teeth | <dentistry> The numerical notation for teeth is an alternate to Palmer's notation. In this notation, the centrals are designated as 1's, the laterals as 2's, the cuspids as 3's, the first bicuspids as 4's, the second bicuspid's as 5's, etc. (08 Jan 1998) |
| numerical taxonomy | <zoology> Study of the relationships of taxa by the application of numerical similarity values to characters so as to rank into categories based on degree of overall similarity. (09 Jan 1998) |
| universal numerical notation for teeth | <dentistry> The universal numerical notation is an alternative numerical notation for teeth. In this notation, your upper right third molar is designated as tooth#1, and then you number each tooth sequentially moving right to left and down across your mouth. (08 Jan 1998) |
| angle of aperture | <ophthalmology, optics> The angle formed by lines drawn from the ends of the diameter of a lens to its point of focus. See: angular aperture. (05 Mar 2000) |
| angular aperture | The angle, in air, of light that passes from the object to the ends of the diameter of the front lens of the microscope objective. (05 Mar 2000) |
| anterior nasal aperture | The anterior nasal opening in the skull. Synonym: apertura piriformis, piriform opening. (05 Mar 2000) |
| aperture | <physics> The opening in an optical system which restricts the size of the bundle of rays incident on a given surface. (Usually circular and specified by diameter.) (09 Oct 1997) |
| aperture, angular | <microscopy> The angle between the most divergent rays that can pass through a lens to form the image of an object. The angle subtended between the axis of a lens and the largest accepted angle of the image-forming rays. With microscope objectives the trigonometric sine of this angle is used to define numerical aperture but as measured from the axial object point. (05 Aug 1998) |
| aperture correction | <microscopy> An electronic process used in some high-resolution video cameras and monitors that compensates for the loss in sharpness of detail due to the finite dimensions (aperture) of the scanning beam. (05 Aug 1998) |
| aperture diaphragm | A metal device that limits the area of the beam emerging from an X-ray tube. (05 Mar 2000) |
| aperture, effective | <microscopy> The diameter of the entrance pupil: it is the apparent diameter of the limiting aperture measured from the front. (05 Aug 1998) |
| aperture for electron microscopy | <technique> Anode aperture: The opening in the accelerating voltage anode shield of the electron gun through which the electrons must pass to irradiate the specimen. Condenser aperture: An opening in the condenser lens controlling the number of electrons entering the lens and the angular aperture of the electron beam. The angular aperture can also be controlled by the condenser lens current. Physical objective aperture: A metallic diaphragm, with a small central hole, used to limit the cone of electrons accepted by the objective lens. This improves image-contrast since highly scattered electrons are prevented from arriving at the Gaussian image plane and therefore cannot contribute to background fog. Aplanatic. Free from spherical aberration and coma. (05 Aug 1998) |
| numerical aperture |
a measure of the acceptance angle of a lens. Higher numerical aperture means the lens gather more diffraction orders yielding higher resolution but at the expense of depth of focus.
출처: www.icknowledge.com/glossary/n.html
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| numerical aperture |
(fiber optic) The light gathering ability of a fiber, defined as the sine of half the angle that contains 90% of the optical power that is captured by the fiber.
출처: connectors.tycoelectronics.com/glossary/glossary-n...
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| numerical aperture |
The characteristic of a fiber optic strand which defines its acceptance of impinging light. The degree of openness, light gathering ability, and angular acceptance are other terms describing this characteristic.
출처: www.nuhorizons.com/Glossary/Optoelectronics.html
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| numerical aperture |
A unitless measure of the ability of a lens to gather and focus light. NA = n sin q, where q is the angle of the light as it narrows to the focal point. A numerical aperture of 1 implies no change in parallel light beams. The higher the number, the greater the focusing power and the smaller the spot. Printer-Friendly Format
출처: www.dvd-makers.com/public/473.cfm
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| numerical aperture |
A ratio that describes the cone of light emitted by the condenser or accepted by the objective lens. Objectives with a larger NA have greater resolving power. (a 100x oil lens with a 1.25 NA can resolve smaller objects than a 100x lens with a 0.95 NA)
출처: www.bi-optic.com/vocab.html
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제품명 |
판매사 |
보험코드 | 성분/함량 | 구분/보험급여 |
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제품명 |
판매사 |
보험코드 | 성분/함량 | 구분/보험급여 |
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