Definitions for "Aperture"
The act of opening.
An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.
Modification of the exine of a pollen grain or spore that is the site of exit for the contents (e.g., laesura, colpus, pore).
(adj. aperturate) (( Erdtman, 1947) A specialized region of the ( sporoderm, that is thinner than the remainder of the sporoderm and generally differs in ornamentation and/or in structure. Comment: Apertures are described as simple if they are present in only one wall layer, or compound if they affect more than one layer of the wall. In compound apertures the shape of apertures may differ between layers. Ectoapertures occur in the sexine/ ectexine, endoapertures in the nexine/ endexine, and mesoapertures are sometimes found in an intermediate position between an ecto- and endoaperture. Various types of apertures are recognised on the basis of their shape (see, colpus, laesura, porus, sulcus, ulcus), position (see, ana-, cata-, zona-, zono-) or fusion (see, syn-). In living pollen grains or spores the apertures usually function as sites of germination, they may also provide routes for transfer of water and other substances, and play a part in harmomegathy. The term is often used in conjunction with a prefix or suffix, as for example in, ectoaperture, endoaperture, inaperturate, omniaperturate, pseudoaperture, triaperturate.
Apertures are very small spots on the walls of a pollen, where the wall is thinner and/or softer. For germination it is necessary that the pollen tube can reach out from the inner of the pollen and transport the chromosomes to the egg deep down in the pistil. The apertures are the places where the pollen tube is able to brake through the elsewhere very tough pollen wall.
The effective cross-sectional area of the antenna. The larger the aperture, the stronger the signal the antenna receives or transmits.
In a directional antenna, the portion of a plane surface very near the antenna normal to the direction of maximum radiant intensity, through which the major part of the radiation passes. In an acoustic device that launches a sound wave, the passageway, determined by the size of a hole in the inelastic material and the wavelength.
The cross sectional area of an antenna. Also called "Capture Area".
Keywords:  autoflash, autofocus, avi
Autofocus Autoflash AVI
Photography ATM Communications
Aperture is a quarterly photography magazine based in New York, New York, USA. The magazine is published by Aperture Foundation, a non-profit organization devoted to fine photography. The foundation also publishes books on fine art photography.
Keywords:  azm, paz, handbook, auto, push
The total range (in percentage) of full scale capacity over which a digital weight indicator's "Automatic Zero Maintenance" (AZM) and "Push-button Auto Zero" (PAZ) functions will operate; Handbook 44 maximum is ±2% of full scale.
Aperture Visual Information Manager, a software program for Microsoft Windows, is developed and marketed by Aperture Technologies, Inc, Stamford, CT. Aperture Visual Information Manager combines a high precision drawing system (CAD) with database connections, enabling users to create sophisticated information systems for such applications as office space planning, data center floor planning, etc. Originally developed for the Apple Macintosh in 1990, it is now runs on the Microsoft Windows operating systems.
In general: The smallest elementary Spatio-temporal area addressable by the process of scanning With application to filtering: The configuration and weights of taps defining the filter function in spatio-temporal domain
Keywords:  usu, expelled, nozzle, gun, cavity
The cavity where water is expelled from the water gun, usu. a nozzle.
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An indexed shape with a specified x and y dimension, or line-type with a specified width, used as a basic element or object by a photoplotter in plotting geometric patterns on film. The index of the aperture is its position or D code.
Aperture is a software program for Mac OS X announced by Apple Computer at a New York media event on October 19, 2005, designed to assist professional photographers in post-production work. It became available in November 2005.
Keywords:  parabolic, dish, collection, area
The collection area of a parabolic dish.
Keywords:  dial, watch, date, displays, hour
Window that displays the date within the dial of the watch
Where the date is displayed within the dial of the watch
The dials of some watches have apertures in which certain indications or the watche's movement are shown (e.g. the date, the hour)
The space between contiguous parallel wires, expressed in millimeters.
Aperture is a Java framework for extracting and querying full-text content and metadata from various information systems and the file formats occurring in these systems.
Keywords:  cpu, ram, rom, chips, hardware
An aperture is a portion of the computer-addressable physical address space which is associated in hardware with a particular device or memory unit. Apertures may reach external devices such as ROM or RAM chips, or internal memories on the accessing CPU itself.
A hole or seam in an electronic equipment enclosure through which internal or external electromagnetic fields may couple.
Vertical, horizontal and depth measurements of facings.
numerical, a measure of the resolving power of the power of an objective respectively.
a place where the substance of a wall or partition has been removed to allow something to go through
Keywords:  aspect, ratio
Aspect Ratio