Ne

Ne
Neon is a light gaseous inert element.
Near Field
Locations close to the sound source between the source and the far field. The near field is typically characterized by large sound pressure level variations with small changes in measurement position from the source.
Near Neat Fuel
Fuel that is virtually free from admixture or dilution.
Near Synchronous Orbit
An orbit in which the satellite rotates close to but not exactly at the same speed as the earth.
Near-End Crosstalk
Impairment typically associated with twisted-pair transmission, where a local transmitter interferes with a local receiver.
Nearsightedness
Myopia. Images of distant objects are formed in front of the retina.
Nebuchadnezzar
The name of a wine bottle equivalent to the volume of 20 standard bottles or 15 litres.
Nebula
A cloud of dust and gas in space which is visible to observers on the Earth because it either emits, reflects or absorbs starlight.
Necking
Reduction of the cross-sectional area of a material in a localized area caused by uniaxial tension.
NEDC
Abbreviation for New European Driving Cycle.
Needle Beam
A steel or wood beam threaded through a hole in a bearing wall and used to support the wall and its superimposed loads.
Needle File
Small files of various cross-sections that are used for detailed work.
Needle Nose Pliers
Pliers with half round and tapered jaws. Also known as Long Nose Pliers.
Needle Roller Bearing
A special bearing which has a small OD when compared to its ID.
Needle Valve
A form of globe valve that contains a sharp pointed, needle like plug that is driven into the and out of a cone shaped seat to accurately control a relatively small rate of flow of a fluid.
NEF
There are a number of different noise criteria measurements used by local authorities to determine noise levels in the community.
Negation
The process of inverting the value of a function or variable.
Negative
A quantity or value that is less than zero.
Negative Alternation
That part of a sine wave that is below the reference level.
Negative Binomial Distribution
A discrete probability distribution useful for characterizing the time between Bernoulli trials. Sometimes called the Pascal distribution.
Negative Electrode
A terminal or electrode having more electrons than normal.
Negative Feedback
Feedback from the output of an analogue circuit that tends to oppose the input.
Negative Ground
A system where the negative terminal of the source is connected to the system′s metal chassis.
Negative Logic
The form of logic in which the more positive voltage level represents a logic 0, FALSE, or LOW and the more negative voltage represents a logic 1, TRUE, or HIGH.
Negative Numbers
Numbers that are less than zero are negative numbers.
Negative Pressure
A relative pressure that is below atmospheric pressure.
Negative Resistance
A device having negative voltage-current characteristics.
Negative Temperature Coefficient
A term used to describe a component whose resistance or capacitance decreases when temperature increases.
Neodymium
One of the more reactive members of the lanthanide group.
Neodymium Aluminium Borate

NdAl3(BO3)4

Used in optics.

Neodymium III Oxide

Nd2O3

Used to dope glass, including sunglasses, make solid-state lasers, and to color glasses and enamels. It forms hygroscopic blue hexagonal crystals.

Neodymium Iron Boron

Nd2Fe14B

A type of rare-earth permanent magent which is an alloy of neodynium, iron and boron that forms a tetragonal crystalline structure.

Neodymium Sesquioxide
Alternative name for Neodymium III Oxide.
Neodymium Yttrium Aluminum Garnet Laser
A synthetic crystal used as a laser medium to produce 1064 nm light.
Neon
Light gaseous inert element.
Neon Bulb
Glass envelope filled with neon gas which when ionized by an applied voltage will glow red.
Neper
A unit expressing the ratio of two numbers as a natural logarithm.
Neptune
The outermost gas giant in our solar system.
Neptunium
Produced artificially by nuclear reaction between uranium and neutrons.
Net Chemical Reaction
A reaction that actually occurs as several elementary steps.
Net Indicated Mean Effective Pressure
The ratio of net work per cycle to cylinder volume displaced per cycle.
Net Radiometer
A sensor that measures net flux of downward and upward total solar and terrestrial radiation through a horizontal surface.
NetBIOS
Abbreviation of Network Input Output System.
Network
A group of nodes and arcs.
Network Covalent Solid
A substance which consists of an array of atoms held together by an array of covalent bonds.
Network Input Output System
The standard interface to networks on IBM PC and compatible systems using Microsoft and IBM network software.
Network Interface Card
Expansion card which lets a PC communicate with a network or use a broadband internet connection.
Network Modem
A modem connected to a LAN that is accessible from every computer on the network.
Network Operating System
An operating system, which is designed to pass the information and communicate between more than one computer.
Network Polymer
A polymer composed of trifunctional mer units that form three-dimensional molecules.
Neumann′s Law
The symmetry of the physical properties of a crystal must include the symmetry of the point group of the crystal.
Neural Network
An approach to machine learning that tries to replicate the neurons of the brain and relies on being trained.
Neuron
A cell of nervous tissue specialized for transmission of a nerve impulse.
Neurotransmitter
A substance released from the axon terminal of a nerve cell which travels across the synaptic cleft to bind to a specific receptor.
Neut Number
Abbreviation for Neutralization Number.
Neutral
In a normal condition.
Neutral Ammonium Fluoride
Alternative name for Ammonium Fluoride.
Neutral Beam
An energetic beam of neutral particles.
Neutral Density
An optical coating that appears grey to the eye and has a flat absorption curve throughout the visible spectrum.
Neutral Equilibrium
A body is in neutral equilibrium if it stays in the displaced position after if has been displaced slightly.
Neutral Flame
A gas flame in which the oxygen and acetylene volumes are balanced and both gases are completely burned.
Neutral Particle Beam
A projected stream of neutral particles such as deuterium or heavy hydrogen at very high particle energies and low currents.
Neutral Plane
Plane through a beam where compression and tension stresses are zero.
Neutral Solution
An aqueous solution in which the concentrations of aqueous hydrogen ions and hydroxide ions are equal.
Neutral Steering
Handling characteristic between understeer and oversteer.
Neutralization Number
The specific quanity of reagent required to neutralize the acidity or alkalinity of a lube sample.
Neutralization Reaction
A chemical change in which one compound aquires H+ from another.
Neutrino
A neutral lepton; one exists for each of the charged leptons (electron, muon, and tau).
Neutron
A sub-atomic particle, within the nucleus of an atom, which has unit mass and zero charge.
Neutron Activation Analysis
An extremely sensitive technique for analyzing trace amounts of elements in a sample.
Neutron Star
A star composed only of neutrons.
New Car Assessment Program
The U.S. government “crash testing” program.
New European Driving Cycle
A European driving cycle designed to assess the emission levels of car engines and fuel economy in passenger cars.
New General Catalogue
A catalogue of non-stellar celestial objects that was compiled by JLE Dreyer of Armagh Observatory and published in 1888.
Newcomen Engine
Also known as the Atmospheric Engine, this admitted steam into a cylinder which was then condensed by cold water and the piston driven by atmospheric pressure.
Newcomen, Thomas
Created the first practical steam engine for pumping water, the Newcomen steam engine.
Newton
The SI unit of force.
Newton Centimetre
Metric unit of torque equal to 0.01 newton metre.
Newton, Isaac
Newton was a mathematician and natural philosopher (physicist).
Newton Metre
The SI unit of Torque.
Newtonian Fluid
A fluid whose viscosity does not depend on gradients in flow speed.
Newtonian Mechanics
The system of mechanics based upon Newton laws of motion in which mass and energy are considered as separate, conservative, mechanical properties, in contrast to their treatment in relativistic mechanics.
Newtonian Speed of Sound
Approximation to the speed of sound a in a perfect gas.
Newtonian Telescope
A reflecting telescope in which a small plane mirror reflects the convergent beam from the objective to an eyepiece at one side of the telescope.
Newtons Alloy
A low melting point alloy.

Newton′s Law of Universal Gravitation
Every particle in the Universe attracts every other with a force which is proportional to the product of their masses and inversely proportional to the square of their seperation.
Newtons Laws of Motion
Sir Isaac Newton published Philosophiae Naturalis Principia Mathematica in 1687 containing the three basic laws of motion.