Ad
- AD
- Abbreviation of Anno Domini.
- Ada
- A large, complex, block-structured computer language aimed primarily at embedded applications.
- Adakane 12
- Another name for Dodecane.
- Adamantane
C10H16
A colourless, crystalline compound with a camphor-like odour. It is a cycloalkane and also the simplest diamondoid.
- Adaptation
- The way living things have changed in order for them to live and survive in their environment.
- Adapter
- Any device or contrivance used or designed primarily to fit or adjust one thing to another.
- Adaptive Differential Pulse Code Modulation
- A compression technique which encodes the predictive residual instead of the original waveform signal so that the compression efficiency is improved by a predictive gain.
- Adaptive Learning
- Learning where a system programs itself by adjusting weights or strengths until it produces the desired output.
- Adaptive Optics
- A technique that uses deformable mirrors on a telescope to correct the blurring caused by turbulence in the atmosphere.
- Adaptive Transform Acoustic Coding
- A lossy audio coding system based on psychoacoustic principles.
- ADC
- Abbreviation of Analogue to Digital converter.
- Adcock Aerial
- An Adcock aerial is a radio aerial system consisting of two vertical open-spaced dipoles with screened horizontal connections.
- Addendum
- That portion of a gear tooth that extends from the pitch circle to the outside diameter.
- Addition
- The operation of finding the sum of two or more quantities.
- Addition Compound
- Compound contains two or more simpler compounds that can be packed in a definite ratio into a crystal.
- Addition of Ordinates
- A graphing technique where two or more functions are independently plotted on the same graph, then their y-coordinates are added together at each point to form the new graph.
- Addition Reaction
- A chemical reaction in which two atoms or groups of atoms are added across a double bond.
- Additive
- A material added to another, usually in small amounts, to impart or enhance desirable properties or to suppress undesirable properties.
- Additive Colour System
- An additive colour system is a colour reproduction system in which an image is displayed by mixing appropriate amounts of red, green and blue light, as for example in a cathode-ray tube.
- Additive Identity
- The additive identity is the number zero, because zero will not change a number when added to it: a + 0 = a for all a.
- Additive Inverse
- The addition of number and it′s additive inverse is zero. The additive inverse of a number a is -a, also known as the opposite of a, such that a + (-a) = 0. For example, 1 + (-1) = 0.
- Additive Primaries
- Red, green, and blue are the primary colours of light from which all other colours can be made.
- Address
- The binary number that represents the collection of binary signals used by memory hardware to determine which memory register to access.
- Address Mask
- A bit mask used to select bits from an Internet address for subnet addressing.
- Address Resolution
- Conversion of an IP Address to the corresponding low-level physical address.
- Adhere
- To stick or be glued to something.
- Adherence Index
- Measure of the adherence of porcelain enamel and ceramic coatings to sheet metal.
- Adhesion
- The state in which two surfaces are held together by interfacial forces which may consist of valence forces or interlocking action.
- Adhesive
- A substance capable of holding material together by surface attachment.
- Adhesive Failure
- A rupture of adhesive bond that appears to be a separation at the adhesive-adherend interface.
- Adhesive Force
- The attractive force exerted on a liquid molecule by the molecules in the surface of the solid.
- Adhesive Tape
- A tape with a sticky substance on one side.
- Adhesive Wear
- Often referred to as galling, scuffing, scoring, or seizing.
- Adiabat
- A line on an indicator diagram that represents an adiabatic process.
- Adiabatic Compression
- Compressing a gas without removing or adding heat.
- Adiabatic Cooling
- A method in which paramagnetic salts are pre-cooled, and then demagnetized, thereby producing further cooling.
- Adiabatic Efficiency
- The efficiency with which work is done with respect to heat gains or losses.
- Adiabatic Expansion
- The expansion of a gas, vapour, or liquid stream from a higher pressure to a lower pressure, with no change in enthalpy.
- Adiabatic Ionization Energy
- The lowest energy required to remove an electron from an atom, ion, or molecule in the gas phase.
- Adiabatic Line
- A line on an indicator diagram that represents an adiabatic process.
- Adiabatic Plasma
- Part of plasma confinement system which involves particles where the orbit radius and orbit period are small compared to the characteristic scales of length and time.
- Adiabatic Process
- A process in which the system does not exchange heat with the surroundings.
- Adiabatic Saturation Process
- A process to determine absolute or relative humidity.
- Adipic Acid
- White crystalline solid used in the manufacture of nylon.
- Adipocyte
- An animal cell specialized for the storage of triacylglycerols.
- Adipoyl Chloride
C6H8Cl2O2
A hazardous chemical that evolves HCl when reacted with water. Can be reacted with hexamethylene diamine to form nylon.
- Adipoyl Dichloride
- Alternative name for Adipoyl Chloride.
- Adjacent Angles
- Two angles are adjacent if they share a common vertex and have a common side between them.
- Adjustable Bevel
- A hand tool for marking angles.
- Adjustable Resistor
- A resistor whose value can be mechanically changed, usually by the use of a sliding contact.
- Adjustable Spanner
- A tool which has a fixed jaw and a movable jaw which is controlled by a spiral gear.
- Admiralty Mile
- Equal to 1852m.
- Admittance
- The ratio of current to voltage, the reciprocal of impedance.
- Adobe
- Sun-dried brick used in places with warm, dry climates, such as Egypt and Mexico.
- ADPCM
- A compression technique which encodes the predictive residual instead of the original waveform signal so that the compression efficiency is improved by a predictive gain.
- ADSL
- Abbreviation of Asymmetric Digital Subscriber Line.
- Adsorb
- To collect molecules of a substance on a surface.
- Adsorbate
- A material that is adsorbed.
- Adsorbent
- A substance that collects molecules of another substance on its surface.
- Adsorbent Filter
- A filter medium primarily intended to hold soluble and insoluble contaminants on its surface by molecular adhesion.
- Adsorbtion Chromatography
- A technique for separating or analyzing mixtures that contain at least one component that is preferentially adsorbed by the stationary phase as it moves over it.
- Adsorbtion Indicator
- A substance that indicates an excess of a reactant in a precipitation reaction.
- Adulterants
- Chemical impurities or substances that by law do not belong in a food, or pesticide.
- Advanced Graphics Port
- Slot on the PC motherboard for graphics cards, and the format of the cards themselves - more commonly known by its abbreviation AGP.
- Advanced Research Projects Agency Network
- More commonly known by it′s abbreviation ARPANET. Was the first operational packet switching network, and one of the networks that came to comprise the global Internet.
- Advection
- The transfer of matter such as water vapour or heat through the atmosphere as a result of horizontal movement of an air mass.
- Adze
- A woodworking tool with a sloping steel or iron blade square off a wooden handle.