Sy

Sylvic Acid
Another name for Abietic Acid.
Sylvine
Naturally occuring potassium chloride.
Symbol Error Rate
A measure of probability of symbol errors in a communication system.
Symbolic Logic
A mathematical form in which propositions and their relationships may be represented symbolically.
Symmedian
Reflection of a median of a triangle about the corresponding angle bisector.
Symmetric Matrix
A matrix A is symmetric if it equals its transpose.
Symmetrical Multivibrator
A circuit that generates square waves.
Symmetrical Thread
Both flanks of the thread profile are inclined at the same angle.
Symmetry
A figure has symmetry if it has parts that correspond with each other in terms of size, form, and arrangement.
Symptom Elaboration
Using built-in indicating instruments or other aids to define equipment malfunction.
Symptom Recognition
Recognition of a situation in equipment operation that is not normal.
Synaesthesia
A cross talk effect in the brain in which one sensory pathway links across to another, resulting in two outputs from one input.
Synchro
A small motorlike analog device that operates like a variable transformer and is used primarily for the rapid and accurate transmission of data among equipments and stations.
Synchro Capacitor
A unit containing three delta-connected capacitors.
Synchromesh Gearbox
A gearbox using a device that synchronizes the speeds of gears that are being shifted together.
Synchronous
The transmission of data between a transmitting and receiving device occurs as a series of zeros and ones.
Synchronous Averaging
A type of signal averaging where successive records of the time waveform are averaged together.
Synchronous Belt Drive
Also known as a Toothed Belt Drive.
Synchronous Dynamic Random Access Memory
SDRAM delivers bursts of data at high speeds using a synchronous interface.
Synchronous Inverter
A unit which converts dc current to ac while at the same time regulating frequency to that of the power line.
Synchronous Motor
An AC motor whose rotor is activated by DC.
Synchronous Optical Network
Data transmission over optical fibre with rates ranging from 51.84 Mb/s to 9.95 Gb/s.
Synchronous Orbit
An orbit in which the satellite moves or rotates at the same speed as the earth.
Synchronous Rotation
The Moon about the same amount of time to rotate on its axis as it does to complete an orbit of the Earth, thus always presenting the same side to Earth.
Synchronous Speed
The speed at which the rotating field in an ac motor revolves.
Synchronous Tuning
In a klystron amplifier, a method of tuning that tunes all the resonant cavities to the same frequency.
Synchroscope
A meter that indicates the relative phase angle between an incoming set voltage and the bus voltage.
Synchrotron
A type of circular accelerator in which the particles travel in synchronized bunches at fixed radius.
Synchrotron Radiation
Electromagnetic radiation emitted by a very high-energy electron, moving in a magnetic field.
Syneresis
The shrinking of a gel.
Syngas
A gas mixture that contains varying amounts of carbon monoxide and hydrogen generated by the gasification of a carbon containing fuel to a gaseous product with a heating value.
Syntax
The rules governing the structure of a language.
Synthesis
The construction of a compound by the union of elements or simple compounds.
Synthetic
A substance manufactured by chemical synthesis.
Synthetic Oil
A non-petroleum based oil.
Synthetic Rubber
A man-made elastomer.
System
A combination of sets, units, assemblies, subassemblies, and parts joined together to form a specific operational function or several functions.
System Efficiency
The overall efficiency of the system.
Systematic Error
A measurement error in an instrumentation system which is predictable and correctable.
Systematic Errors
Cumulative errors that can be compensated for, if the errors are known.
Systems Engineering
Lists all Systems Engineering topics in the Encyclopaedia
Systems Engineering Books
Lists all Systems Engineering Books in the Encyclopaedia
Systems Engineering Calculations
Lists all Systems Engineering Calculations in the Encyclopaedia
Systems Engineering Weblinks
Lists all Systems Engineering Weblinks in the Encyclopaedia