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Se- Se
- The electrical properties of selenium are of particular interest as it is both photovoltaic and photoconductive.
- SEA
- Abbreviation of Statistical Energy Analysis.
- SEA Coupling Loss Factors
- Statistical energy analysis coupling between different types of structure.
- Sea Water
- Contains the majority of the common elements in small quantities.
- Seaborg, Glenn
- American nuclear chemist.
- Sealing Wax
- The wax used to seal confidential documents.
- search
- The Search page of the Science and Engineering Encyclopaedia
- Sec
- Abbreviation of trigonometric function secant.
- Secant
- Trigonometric function.
- Secant Line
- A line that intersects a curve or circle in two places.
- Second
- The second is the SI unit of time or 1/360 of a degree.
- Second Class Lever
- The load is situated between the fulcrum and the applied force.
- Second Law of Thermodynamics
- Clausius states: No process is possible whose sole result is the transfer of heat from a colder to a hotter body.
- Second Order Reaction
- A reaction with a rate law that is proportional to either the concentration of a reactant squared, or the product of concentrations of two reactants.
- Second Postulate of Special Relativity
- The speed of light in a vacuum is a constant regardless of the speed of the source or the speed of the observer.
- Secondary Cell
- A galvanic battery which, after discharge, may be restored to the fully charged state by the passage of an electric current though the cell in the opposite direction to that of discharge.
- Secondary Radiation
- Electromagnetic or particulate radiation resulting from absorption of other radiation in matter.
- Secondary Ride
- A term used to indicate the ride response of a vehicle in the frequency range of 8-20 Hz.
- Seebeck Effect
- The principle that describes how a thermocouple works.
- Seiche
- An oscillation of a fluid body in response to a disturbing force having the same frequency as the natural frequency of the fluid system.
- Seismic
- Of or having to do with earthquakes.
- Seismograph
- An instrument for detecting and recording the intensity, direction, and duration of a movement of the ground caused by an earthquake or explosion.
- SEL
- There are a number of different noise criteria measurements used by local authorities to determine noise levels in the community.
- Selenium
- The electrical properties of selenium are of particular interest as it is both photovoltaic and photoconductive.
- Selenoid
- A satellite of the earth′s moon, no such satellites are known.
- Selenology
- That branch of astronomy that treats of the moon.
- Self Discharge
- The loss of useful capacity of a cell or battery due to internal chemical action.
- Self Extinguishing
- A material which will not support
combustion when external source of flame is removed.
- Self Noise
- Extraneous non-acoustical signals, generated or induced in a measurement system.
- Semi-Anechoic Chamber
- A room which creates free field conditions but above a reflective plane.
- Semiconductor
- An element, such as silicon, that is intermediate in electrical conductivity between conductors and insulators, through which conduction takes place by means of holes and electrons.
- Semiconductor Detector
- Radiation striking very pure Ge and Si semiconductor detectors can excite a large number of electrons into the conduction band leading to a measurable current.
- Sensation Level
- The level of psychophysiologic stimulation above the threshold.
- Sensitivity
- The greater the sensitivity, the greater the system′s signal-to-noise ratio.
- Sensor
- A device that converts a physical stimulus (such as force, sound, pressure, motion) into a corresponding electrical signal.
- Separable Equations
- A differential equation is separable if it can be written: y′=A(x)B(y)
- Septet
- A unit of quantity equal to 7.
- Septillion
- A number equal to 1024.
- Sequential Access Memory
- A memory in which access of the registers must be in sequential order.
- Serial Communications
- Transmission of binary data from one device to another one bit at a time.
- Series
- The sum of a finite or infinite sequence.
- Series Expansions
- Most functions can be described as an series expansion.
- Service Drag
- This is drag from air ducted to cooling components.
- Set
- A collection of objects called elements.
- Set Point
- Value of a controlled variable, departure from which causes a controller to operate to reduce the error and restore the intended steady state.
- Set Screw
- A plain screw used principally for locking adjustable parts in position.
- Settling Time
- When a change in a signal occurs, this is the time taken for it to settle to its new value.
- Sexagesimal
- In the sexagesimal system calculations are done in the base 60 as used by the Ancient Babylonians.
- Sextet
- A unit of quantity equal to 6.
- Sextillion
- A number equal to 1021.
- Sextuple
- A group of six items.
- Seyfert Galaxy
- Type of galaxy with a point-like nucleus and very faint spiral arms, first described in 1943 by American astrophysicist Carl Seyfert.
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