Nu

nu
A letter of the Greek alphabet.
Nuclear and Particle Physics
Lists all Particle Physics topics in the Encyclopaedia
Nuclear and Particle Physics Books
Lists all Particle Physics Books in the Encyclopaedia
Nuclear and Particle Physics Calculations
Lists all Particle Physics Calculations in the Encyclopaedia
Nuclear and Particle Physics Conversions
Lists all Particle Physics Conversions in the Encyclopaedia
Nuclear and Particle Physics Weblinks
Lists all Particle Physics Weblinks in the Encyclopaedia
Nuclear Binding Energy
Energy needed to break an atomic nucleus into separate protons and neutrons.
Nuclear Cross Section
The effective area that a given nucleus presents as a target to a bombarding particle, giving a measure of the probability that the particle will induce a reaction.
Nuclear Energy
Energy stored in the nucleas of an atom.
Nuclear Equations
Show the changes that take place in the nuclei.
Nuclear Fusion
The combining of light nuclei to form a heavier nucleus.
Nuclear Reaction
A reaction involving the nucleus of an atom that alters the energy, composition or structure of the atom.
Nuclear Reactor
An apparatus in which nuclear fission may be sustained in a self supporting chain reaction.
Nucleate
To form a central part around which other parts can attach.
Nucleation
The initial stage in a phase transformation.
Nuclei
The plural of nucleus, the central part of an atom that contains the protons and neutrons.
Nucleic Acid
A polymer made of repeating nucleotides. Examples are DNA and RNA.
Nucleoid
In prokaryotes a region of the cell which contains chromosomal DNA.
Nucleon
Either a proton or a neutron.
Nucleoside
A nucleotide base bound to a five-carbon sugar.
Nucleotide
A molecule which is a basic building block of nucleic acids and which plays a key role in energy transfer in biochemical reactions.
Nucleotide Base
A heterocyclic nitrogen-containing base that is a constituent of nucleotides.
Nucleus
The central part of an atom that contains the protons and neutrons.
Nucleus
The nucleus of eukaryotes is a membrane bound organelle, which contains the chromosomal DNA.
Nuclide
An atom or ion with a specified mass number and atomic number.
Nuclide Symbol
A symbol for an nuclide that contains the mass number as a leading superscript and the atomic number as a leading subscript.
Null
A low or minimum point on a graph. A minimum pressure region in a room.
Null Experiment
An experiment which, after being executed, yields no result.
Null Hypothesis
Proposes a general or default position, such as that there is no relationship between two measured phenomena, or that a potential treatment has no effect.
Null Set
The null set is a set that contains no objects. Also known as the empty set.
Null Space of a Matrix
The null space of a m by n matrix A is the set of all vectors x in Rn such that Ax = 0.
Nullity of a Linear Transformation
This is the dimension of its null space.
Nullity of a Matrix
This is the dimension of its null space.
Number
A mathematical entity that may indicate quantity or amount of units.
Number Drills
This system of numbering drills is no longer used, but may be of use in deciphering old drawings.
Number Line
A line on which each point represents a real number.
Number of Gram Equivalent Weights
The number calculated by dividing the mass of a substance (in grams) by the equivalent weight of the substance.
Number Representation
The representation of numbers by agreed sets of symbols according to agreed rules.
Number System
Any system for the representation of numbers.
Numeral
A numeral is just an object or symbol that stands for a number. For example, 5 is the Arabic numeral for five, and V the Roman numeral for five.
Numerator
The quantity or value on the top of a fraction.
Numeric
Composed wholly or partly of digits.
Numeric Coding
A system of coding in which information is represented by digits.
Numerical Analysis
The study of methods for approximation of solutions of various classes of mathematical problems including error analysis.
Numerical Analysis Books
Lists all Numerical Analysis Books in the Encyclopaedia
Numerical Analysis Calculations
Lists all Numerical Analysis Calculations in the Encyclopaedia
Numerical Analysis Conversions
Lists all Numerical Analysis Conversions in the Encyclopaedia
Numerical Analysis Source Code
Lists all Numerical Analysis Source Code in the Encyclopaedia
Numerical Analysis Weblinks
Lists all Numerical Analysis Weblinks in the Encyclopaedia
Numerical Control
Any controlled equipment that allows an operator to program its movement by entering a series of coded numbers and symbols.
Nusselt Number
A number expressing the ratio of convective to conductive heat transfer between a solid boundary and a moving fluid.
Nut
A type of hardware fastener with a threaded hole.
Nutating
Moving an antenna feed point in a conical pattern so that the polarization of the beam does not change.
Nutation
The oscillation of the axis of any rotating body, as a gyroscope rotor.