The power loss in an electrical system, or in other words, loss of signal strength. Its measurement is decibel/distance (typically dB/1,000 feet of dB/ft).

Diminution of the virulence in a strain of an organism, obtained through selection of variants that occur naturally or through experimental means.

refers to loss in signal strength, due to resistance, absorption, capacitance or any characteristics of the medium.

Amount of signal loss in a transmission. Usually measured in decibels. High attenuation can be caused by poor connections, defective connector hardware, excessively long lines, or ambient temperatures

Decrease in magnitude of communication signal.

The progressive degradation of a signal as it travels from one point to another.

The degree to which an input signal is reduced in amplitude at the output of a circuit or device. Measured in dB.

This refers to signal loss in a transmission system.

In dynamics, the amount the strength of a field diminishes as distance from the affected object increases.

Weakening (dilution) of the concentration, as of an antigen in a vaccine.

The weakening of a signal over distance. phonelines are suitable for home networking because there's adequate signal strength between jacks in different rooms or on different floors.

reduction of signal magnitude or signal loss, usually expressed in decibels

To reduce in signal level.

The reduction in the intensity of radiation with distance from its source due to atmospheric absorption and/or scattering. It does not include the inverse-square decrease of intensity of radiation with distance from the source.

Reduction of electrical or acoustic signal strength

It refers to the reduction of the radar beam power due to the reflection or absorption of energy when it strikes a target. The greatest attenuation occurs when the radar beam goes through very heavy rain.

A reduction in sound level (loudness) as a result of any of the following 1) with increasing distance away from a source (expanding waves); 2) as sound is partially absorbed upon reflection off a surface; or 3) as sound passes through a barrier material such as drywall or glass.

General transmission term used to denote a decrease of signal magnitude.

Loss of signal strength as a function of distance. In optical fibre, it is the "dimming" of the light as it travels through the fibre expressed in decibels per unit feet (usually 1000 ft.)

The weakening of the signal being transmitted. It is a crucial factor in LAN design and the lengths of cable being used.

The weakening of transmitted signals as they travel further from their point of origin. Attenuation occurs in both analog and digital systems.

the loss of signal strength during transmission of a signal, light beams or light wave. In cables, it is generally expressed in decibels per length. The opposite of gain.

Weakening of the radio frequency signal due to being partially blocked or absorbed.

Reduction of the radiation intensity, upon passage through matter, resulting from all types of interaction.

Any process in which the rate of flow of a beam of energy decreases (mainly due to absorption or scattering) with increasing distance from the energy source.

Loss of energy (i.e. conversion to heat) as radiation passes through a lossy (absorptive) medium (expressed in dB). Function of the properties of the medium. In contrast to insertion loss or reflectivity.

A ratio used to measure the effectiveness of a given shield. The ratio is expressed as the field strength at a given point vs. the resulting field strength at the same point with a magnetic shield in place. A shield which provides a reduction of 100 times has an attenuation of 100:1.

The decrease in magnitude of power of a signal in transmission between points. A term used for expressing the total loss of an optical system, normally measured in decibels (dB) at a specific wavelength.

Blocking or modulation of the excitation light intensity can be accomplished with a series of filters that transmit increasing percentages of the incident light or with an acousto-optic tunable filter (see AOTF).

The reduction that occurs in contaminant concentrations during transport through soil or rock.

The reduction of light intensity over distance

The loss of sound volume caused by some physical action on the sound (such as its traveling over a distance or reverberating off a wall). See also angular attenuation, distance attenuation, reverberation attenuation, room reflectivity attenuation.

the decrease in signal strength as a result of absorption and scattering of energy by objects such as buildings, trees, people, etc.

The maximum guaranteed reduction in power, ranging outside a specified frequency span. Spurious response attenuation is the minimum acceptable attenuation in the stopband, which allows for unwanted modes in the crystal.

It is the same as the amplitude response. It is the ratio between the output and input signal levels of a signal-handling device. Usually expressed in dB. dB = 20*log 10(ratio of signals) or dB = 20*log 10( Vo/VI). The reduction in signal amplitude imposed by the filter upon an input signal.

The decrease in amplitude of a signal between any two points in a circuit. Usually expressed in decibels. Attenuation is the opposite of amplification

Decrease in magnitude of the current, voltage, or power of a signal in transmission between points because of the transmission medium. Usually expressed in decibels.

The loss of energy (strength) of a signal as it passes through a transmission medium. The energy loss is the result of the electrical resistance offered by the specific medium.

The process by which a compound is reduced in concentration with distance and time through absorption, adsorption, degradation, dilution, diffusion, dispersion, and/or chemical or biological transformation.

Decrease in intensity usually of such wave phenomena as light or sound.

The reduction in the strength of a signal over distance, expressed in decibels per kilometer (dB/Km) or per 100 feet. Factors affecting attenuation are the frequency range of the signal, wire shielding, and type of cable. Unshielded twisted pair (UTP) cable suffers from the most attenuation, while fiber-optic cable has very little attenuation.

Loss of signal strength and integrity over a given length of cable

The decrease in magnitude of a signal as it travels through any transmission medium such as a cable or optical fiber. Measured in dB per unit of length.

The reduction in intensity of radiation after processing through a filter. This can be measured in dB.

Loss of signal strength in a lightwave, electrical, or radio signal that is usually related to the distance the signal must travel. For example, fiber-optic transmission must be regenerated approximately every 30 miles. Radio signal attenuation may be due to atmospheric conditions, sun spots, antenna design or positioning, and line-of-sight obstacles. Usually expressed as a ratio in decibels (Db).

the decrease of a signal's amplitude level over any distance during transmission or through purpose designed attenuators. Attenuation measures signal loss in decibels (dB)

Loss of power. Attenuation is usually measured in db loss per length of cable (ex. 31.0 db/100Ft.). Attenuation increases as frequency increases.

Decrease in signal strength as it passes through a system or medium. Measured in decibels.

The decrease of a signal with the distance in the direction of propagation. Attenuation may be expressed as the scalar ratio of the input power to the output power, or as the ratio of the input signal voltage to the output signal voltage.

a decrease in the energy of light due to absorption and scattering in the water column

Diminution of observed correlation because of restrictions occurring during measurement. Attenuation occurs when observations are taken from a restricted range or when category or rank formulas are used to calculate correlation coefficients on interval data. EX: the effect of moisture content on setting time of materials is underestimated if only a small range of moisture content is studied or if phi or rank correlation formulas are calculated. [See correlation coefficient

Signal power lost in a transmission medium as the signal travels from sender to receiver.

The progressive diminution in space of certain quantities characteristic of a propagation phenomenon.

A reduction in the amplitude of energy, used frequently for seismic waves.

An adjustment of the signal amplifier response which results in the reduction of the electronic signal.

Loss of optical power in a fiber due to Raleigh Scattering, absorption and geometric perturbation of the fiber.

weakening in force or intensity; "attenuation in the volume of the sound"

the property of something that has been weakened or reduced in thickness or density

The reciprocal of gain; a dimensionless ratio defining the decrease in magnitude of a signal as it passes between two points or two frequencies. Large values of attenuation are expressed in decibels (dB).

reduction of the virulence of a strain of a harmful organism, as in vaccine production

The progressive weakening of a signal as it travels away from its point of origin.

A loss of signal strength usually related to the distance the signal must travel. Radio signal attenuation may be due to atmospheric conditions, antenna design / positioning, obstacles, etc. Attenuation is measured in decibels.

Fibre is produced to a very high optical quality but some light will be absorbed along its length. The reduction in light with fibre length is known as attenuation. Attenuation will increase as the fibre length increases.

(communications usage) Signal strength loss between the transmission and reception points. For example: Heavy rainstorms can cause microwave signals to seem to fade, i.e., to attenuate, as the rainstorm passes through an area. (See also: Rain Fade)

The process, intentional or unintentional, of decreasing the magnitude of a signal. Also see Path Loss.

The weakening of transmitted signals as they travel away from their point of origin. Amplifiers can recharge the signal up to a point.

The difference between transmitted and received power resulting from the loss through equipment, lines, or other transmission devices; usually expressed in decibels.

The factor by which the signal power at the end of the cable has decreased relative to the power at the start of the cable. Main causes in optical fibers: scattering, absorption, light losses in connectors and splices.

Reduction of a signal. Usually referred to in decibels.

The reduction of sound level per unit distance by divergence, diffusion, absorption, or scattering. In acoustics, the diluting or holding back of the energy of sound waves as they pass through a material. Materials are rated for their ability to prevent sounds from traveling through them.

A measure of the reduction in strength of a signal. Referring to exhaust system noise: a measure of the noise reduction achieved by a given exhaust design.

Any loss of energy due to absorption and scattering of IR radiation by atmospheric elements.

The reduction in signal amplitude imposed by a filter or other electronics circuit upon an input signal.

Reduction in magnitude, as in the lowering of peak runoff discharge rates, in the case of dry ponds; or the reduction of contaminant concentrations, as in the action of biodegradation in wetlands or bioretention facilities.

Attenuation is a general term that refers to any reduction in the strength of a signal.

A reduction or weakening of strength or toxicity.

The loss or weakening of a signal through a transmission line, transmission component, or signal path. Usually refers to loss in signal amplitude or signal power, and is typically measured in decibels ( dBi ).

The factor by which a signal is made smaller.

a reduction in wave amplitude.

The decrease in magnitude of a wave as it travels through any transmitting medium, such as cable or circuitry. Attenuation is measured as a ratio or as the logarithm of a ratio (decibel).

A general term used to denote a decrease in magnitude of power or field strength in transmission from one point to another caused by such factors as absorption, reflection, scattering, and dispersion. It may be expressed as a power ratio or by decibels.

The decreasing of a transmitted signal as it travels along a cable. The longer the cable the more loss there will be. Above a certain amount of loss, the cabling may not transmit network data reliably.

Decrease in the number of particles in a beam of radiation, or decrease in the exposure rate caused by passage of radiation through matter. The decreases result from absorption and scattering.

The absorption of a photon, or any charged particle, by matter.

The decrease in a signal's power from transmission to reception. The received signal is lower in power because of such factors as line resistance, distance and network configuration. ADVERTISEMENT

General term for a reduction in concentration of a substance, e.g. a contaminant reduced by dispersion or biological processes.

To lessen, weaken, or diminish (i.e. to weaken a signal)

When a form of energy is propagated through a medium, its amplitude is decreased. This decrease is termed attenuation.

The rgen_infotion in amplitude of a wave with time or distance traveled.

Reduction of the signal power or field strength as a function of distance through a material. Also refers to shielding effectiveness.

The decrease in signal power over distance.

The reduction in intensity of radiation as a result of being absorbed in a medium as it passes through the medium.

A signal loss or decrease.

The amount of sound reduction provided by a hearing protector. Higher numbers indicate more protection. This number is usually measured in decibels.

The loss of signal energy due to absorption, reflection, or diffusion during transmission.

The reduction of sound energy as a function of distance traveled.

A loss of signal strength in a lightwave, electrical or radio signal usually related to the distance the signal must travel (e.g. fiber optic transmission must be regenerated approx. every 30 miles). Fiber optic attenuation is caused by transparency of the fiber, bending the fiber at too small of a radius, nicks in the fiber, splices, poor fiber terminals, FOTs, etc. Electrical attenuation is caused by the resistance of the conductor, poor (corroded) connections, poor shielding, induction, RFI, etc. Radio signal attenuation may be due to atmospheric conditions, sun spots, antenna design / positioning, obstacles, etc.

A general term describing the loss of power between two points, measured in decibels per kilometer (dB/km) at a specified wavelength (nm).

A reduction in power or amplitude of the transmitted signal.

Reduction in power or strength (amplitude) of a transmitted signal as the signal travels along the cable. Attenuation is caused by capacitance, inductance and resistice losses in the cable. Attenuation is a function of frequency. Genrally, the greater the frequency, the more attenuation. Attenuation is also a function of distance. The greater the distance, the more attenuation. Attenuation is expressed as decibels/unit length and expresses a power loss per distance traveled. Also, frequency must be stated otherwise the data is useless. For example, attenuation specs stated as 6.5 db/1000m@10MHz means that the signal has lost 6.5 decibels of power over the 1000 meters of cable it traveled at a frequency of 10MHz. Attenuation is always present on a cable, as i capacitance. To improve error rates and achieve the reliable data transmission, the communications cable should have the lowest practical combination of the two.

A decrease in signal strength resulting from increasing distance from the signal source, from interference from other sources, or from signal filters.

The reduction of sound intensity (or signal strength) with distance. Attenuation is the opposite of amplification, and is measured in decibels.

the process by which a beam of radiation is reduced in intensity when passing through some material. It is the combination of absorption and scattering processes and leads to a decrease in flux density of the beam when projected through matter.

The reduction in amplitude of an electrical signal due to a transmission line or other network.

The decrease in radiation energy (power) as a beam passes through an absorbing or scattering medium.

The reduction in optical power as it passes along a fiber, usually expressed in decibels (dB). See optical loss

The reduction in intensity of a beam of X- or gamma radiation during its passage through matter caused by absorption and scattering.

The decrease in magnitude of a wave, or a signal, as it travels through a medium or an electric system. It is measured in decibels (dB).

Loss of signal power. Attenuation is typically measured in decibels per kilometer (dB/km) at a specific wavelength.

A decrease in a signal's strength (measured in decibels) as it transmits over wires or cables. The shorter the wire or cable the less attenuation occurs.

The decrease in the magnitude of the power of the signal transmitted over a wire (as a function of distance) measured in decibels. As distance increases, attenuation also increases and hence signal power decreases.

Loss of signal strength as a function of distance. In optical fiber, it is the "dimming" of the light as it travels through the fiber expressed in decibels per unit (db/Km).

A term that refers to signal loss in a transmission system.

The decrease in the magnitude of a signal. A decrease in signal voltage during its transmission from one point to another.

Loss of a signal in transmission through a filter, usually referring to signal amplitude or signal power. Usually measured in decibels (dB).

A decrease in signal strength over the length of a cable.

Loss of signal transmitted through any transmitting medium. Measured in decibels for unit length of cable.

Made thin, weak, or fine, as in strength, value, or virulence.

The decrease in optical level along a fiber optic waveguide caused by absorption and scattering. Attenuation is usually expressed in dB/km.

Reduction of radiation intensity as a result of absorption or scattering as the radiation passes through a medium such as air or water.

A term that describes the loss of electromagnetic energy (solar radiation) as it passes through the atmosphere owing to absorption and scattering by atmospheric particles and molecules.

Power loss resulting from conductor resistance and dielectric loss within the insulating material used to separate the conductors.

An electrical signal's reduction in concentration as the signal passes through media. Attenuation is measured in decibels.

The decrease in amplitude of a signal during its transmission from one  point to another.  It may be expressed as a ratio or by extension of the term, in decibels.

(1.) A decrease in magnitude of current, voltage, or power of a signal in transmission between points. It may be expressed in decibels or nepers. (2.) In 3D graphics, the fall off of light intensity with distance.

The process by which a compound is reduced in concentration over time, through absorption, adsorption, degradation, dilution, and/or transformation. an also be the decrease with distance of sight caused by attenuation of light by particulate pollution.

The decrease in signal power that occurs in a device or when a signal travels to reach a destination point (path loss).

The fractional decrease of the intensity of an energy flux, including the reduction of intensity resulting from geometrical spreading, absorption, and scattering.

The process by which a compound is reduced in concentration over time or distance through absorption, degradation, or transformation.

The reduction of a signal from one point to another. For an electrical surge, attenuation refers to the reduction of an incoming surge by a limiter (attenuator). Wire resistance, arresters, and power conditioners attenuate surges to varying degrees.

The intensity of a light through the scene as it diminishes with distance from the source.

A decrease in signal magnitude between two points, or between two frequencies. The reciprocal of gain.

Any decrease in amplitude, density, or energy as result of an effect such as scattering, absorption, or friction. In physical meteorology, a reduction in radiation flow, especially solar radiation by atmospheric gases and aerosols. In radar meteorology, the decrease in the magnitude of current, voltage, power, or intensity of a signal in transmission between points. Attenuation may be caused by interference such as rain or clouds.

A decrease in signal magnitude between two points. These points may be along a radio path, transmission line or other device.

The amount of signal lost as it travels through the cabling system.

The reduction of noise or emissions

The loss or dissipation of WAVE energy, resulting in a reduction of WAVE HEIGHT ( AMPLITUDE).

The loss of average power in a transmission system, usually expressed in dB (ie: loss of video signal through a coaxial cable or light intensity through optical fibre).

Lowering a signal's strength, or amplitude is called attenuation. Signals weaken, or are attenuated, as it travels over a wire.

The reduction in the level of a quantity, such as the intensity of a wave or radiation.

The amount of signal reduction (in dB) provided by a filter or shielded enclosure.

In physics, any process in which the flux density (or power, amplitude, intensity, illuminance, etc.) of a "parallel beam" of energy decreases with increasing distance from the source. Attenuation is always due to the action of the transmitting medium itself, mainly by absorption and scattering. In meteorological optics, the attenuation of light is termed extinction.

The process of decreasing virulence or altering a disease producing agent by growing it in another host, usually for the purpose of making a vaccine.

the process of decreasing the amplitude of a signal as it passes from one point to another. Analog attenuation circuits typically use resistors to reduce the voltage of a signal. In audio, the effect of such attenuators is usually expressed in decibels.

A decrease in the power of a received signal due to loss through lines, equipment, or other transmission devices. Usually measured in decibels.

A decrease in signal magnitude form one point to another, or the process causing this decrease.

Loss of power, expressed in dB. Attenuation is expressed in dB as follows:PdB = 10 x Log (Pout/Pin). For example: If, due to attenuation, half the power is lost (Pout/Pin = 2), attenuation in dB is 10 x Log (2) = 3dB. Path Loss: Path loss is the loss of power of an RF signal travelling (propagating) through space. It is expressed in dB

The decrease in the power of a signal, light beam or light wave as they pass through a transmission medium. (example: wire)

In an optical fibre, the diminution of average optical power. In optical fibres, attenuation results from absorption, scattering, and other radiation losses. Attenuation is generally expressed in dB without a negative sign. Calculations and equations involving loss show and use the negative sign. Attenuation is often used as a synonym for attenuation coefficient, expressed in dB/Km.

Expressed in decibels (db) per unit length, it is the loss of power in an electrical system.

is the decrease in signal strength as the signal travels through any medium such as a cable.

Reduction of the intesity of sound as a result of energy conversion from sound to motion or heat.

Power loss in an electrical system. In cables, generally expressed in dB per unit length.

The decrease in signal strength along a fiber optic wave-guide caused by Absorption and scattering. Attenuation is usually expressed in dB/km.

When you throw a pebble in a pond, it makes waves on the surface that move out from the place where the pebble entered the water. The waves are largest where they are formed and gradually get smaller as they move away. This decrease in size, or amplitude, of the waves is called attenuation.

The decrease in radiant flux as it passes through an absorbing or scattering medium

The suppression of signal before detection in an optical system. Usually, the wavelength or wavelength range is defined along with the degree of attenuation expressed in relative or absolute optical density.

is a reduction in the strength of light or an electrical signal and is usually measured in decibels.

A decrease or loss in a signal.

(or loss) is a measure of how much of the light "launched" into one end of the fiber comes out of the other end, or the decrease in magnitude of light intensity (power) from the transmitting LED to the receiving photodiode. Attenuation is usually measured in decibels per kilometer (db/km) at specific wavelengths. Every component in a fiber optic system introduces some attenuation (connector, coupler, splice), added to the linear loss of the fiber itself. Typically, single mode fibers have attenuations of less than 1 db/km, and multimode fibers less than 5 db/km.

A term indicating a decrease in power from one point to another. In optical fibers, it is measured in decibels per kilometer at a specified wavelength.

Optical loss of power. Attenuation is measured in dB loss per length of cable. Attenuation is usually caused by absorption and scattering.

The total light lost from a beam of light propagating through water. These losses are due to scattering from suspended materials and the molecular scattering of the water itself, and to particulate and dissolved materials and the water itself absorbing the light. The amount of attenuation is primarily dependent upon the wavelength of the propagated light, the concentration of suspended materials and the concentration and composition of both particulate and dissolved absorbing materials.

Any process in which the intensity of radiation decreases due to scattering or absorption.

The reciprocal of gain, when the gain is less than one. It may be expressed as a "dimensionless ratio," "scalar ratio," or in decibels as "20 times the log 10 of that ratio".

1. (Also called extinction, especially in reference to optical frequencies.) A general term used to denote a decrease in signal strength in transmission from one point to another. For the propagation of electromagnetic waves through a medium, attenuation is caused by absorption and scattering. The volume attenuation coefficient (m−1) of such a medium is the fractional reduction of radiance per unit pathlength. In radar usage, the specific attenuation is the fractional reduction in power density per unit pathlength as plane-wave radiation propagates through a medium, usually expressed in decibels per kilometer. Attenuation ordinarily does not refer to the inverse-square falloff of irradiance or power density with range that is simply a consequence of beam divergence. See extinction coefficient. 2. The scattering and absorption of radiant energy by clouds or the atmosphere that decreases the radiation received by satellite sensors.

The decrease in magnitude of a signal as it travels through any transmitting medium, such as a cable or circuitry. Attenuation is usually expressed logarithmically as the ratio of the original and decreased signal amplitudes. It is usually expressed in decibels (dB).

Lessening or loss of signal intensity during transmission.

Reducing the amplitude of a waveform without introducing distortion. An adjustable passive network (filter) may be used to reduce power level of a signal without introducing any appreciable distortion

(1) Generally, a term used to describe the slowing, modification, or diversion of the flow of water as with Detention and Retention. (2) (Water Quality) The process of diminishing contaminant concentrations in ground water, due to filtration, biodegradation, dilution, sorption, volatilization, and other processes.

A decrease in magnitude ( a weakening ) of a current, voltage or power of a signal.

The effect of signal dwindling, experienced with accumulating line length or distance of radio transmission.

The measure of the weakening of a signal (loss) that occurs as it travels through a device or transmission medium (e.g. radio waves through the atmosphere, an electrical signal through a cable). Attenuation is usually measured in decibels.

Decrease in the magnitude of a signal, which may be expressed as a ratio, or in decibels. The opposite of amplification.

The loss in power of electromagnetic signals between transmission and reception points.

A reduction is strength or deterioration of an electrical signal as it passes through a transmission medium. Attenuation generally increases with frequency, cable length and the number of connections in a circuit. Attenuation is measured in decibels (dB). In optical fiber, a diminution of the signal is only a function of length traveled.

reduction in signal strength.

The loss of signal strength as it flows through a cable. Usually expressed in decibels (dB).

The decrease in amplitude of a signal at a specified frequency during its transmission through a filter.

Loss of signal intensity due to system elements, expressed in dB at a certain wavelength and calculated between two points in a fiber optic network or as a network's total loss.

The sound reduction process in which sound energy is absorbed or diminished in intensity as the result of energy conversation from sound to motion or heat.

A reduction in signal or sound level.

Drop in light intensity due to absorption and scattering within the ocean.

Power loss of electromagnetic signals between transmission and reception points.

Attenuation is the measure of the reduction in signal magnitude, or loss, along a length of fiber. Attenuation in fiber optic cabling is usually expressed in decibels per unit length of cable (i.e. dB/km) at a specified wavelength. See also: reflectance, insertion loss

A loss measure for voltage, current or power (optical or electrical). The loss in optical power along the optical fibre is measured in dB/Km and should be quoted at a specified light wavelength.

The reduction of radiation field intensity caused by the interaction of particles or electromagnetic radiation with matter. Usually refers to energy lost in shielding used for radiation protection.

The loss of average optical power. Attenuation results from absorption and scattering in the optical fiber. An attenuator is a passive optical component that reduces the power of the optical signal transmitted through it.

Signal power loss through equipment, lines or other transmission devices. Measured in decibels.

The decrease in the strength of a signal, measured in decibels.

The power loss between one transmitting source and one receiver due to path losses. Path loss includes signal interference or weakening from atmospheric effects such as rain and storms, radiation surges from the sun or other celestial bodies or dissipation from the massive distances traveled by RF signals.

The dissipation of the power of a transmitted signal as it travels over a wire.

the process of reduction.

is the difference between the transmitted and receive power of a signal when affected by various transmission losses in a media. go to top

Phenomenon by which an RF signal is made smaller as it moves from one point to another. It is used interchangeably with the term insertion loss and it is measured in decibels.

The decrease in power or amplitude of a signal as it travels along the wire.

A decrease in light due to absorption by a chromagen in radiative energy attenuation technologies.

The decrease of a propagating physical quantity, such as a radio signal, with increasing distance from the source, or from some obstruction.

the difference between the measurement of a blast wave on the outside and inside of a barrier. Decrease in intensity of a signal, beam, or wave as a result of absorption of energy and of scattering out of the path of a detector, but not including the reduction due to geometric spreading, i.e., the inverse square of distance effect. Also t he absorption of infrared wavelengths due to carbon dioxide, water vapor, and ozone reducing the effectiveness and range of laser & IR guided weapons. See A-1 Revetment, B-1 Revetment, Blast Wave, Revetment, Shock Wave.

The ability of a filter circuit to reduce the amplitude of unwanted frequencies to a level below that of the desired output frequency.

The rction of the energy or intensity of sound.

Lessening or loss of signal intensity as the signal propagates through a medium. Attenuation is directly proportionate to frequency.

the loss of optical energy a signal experiences as it travels through optical fiber. It determines the spacing of repeaters needed to maintain acceptable signal levels. Attenuation is one of the key factors that determine the cost of a fiber optic telecommunication network.

The difference between transmitted and received power due to loss from lines, electronic components, or other transmission devices; usually expressed in decibels (dB).

Loss of signal power between points. In optical cables, attenuation is a ratio of input power vs. output power, measured in decibels per unit length, usually dB/km.

The reduction, typically by some controlled amount, of an electrical or acoustic signal.

the loss or reduction of amplitude of a signal

Attenuation is the decrease in intensity of electromagnetic radiation due to absorption or scattering of photons. Attenuation does not include the decrease in intensity due to inverse-square law geometric spreading. Therefore, calculation of the total change in intensity involves both the inverse-square law and an estimation of attenuation over the path.

A form of gene regulation wherein termination of transcription is controlled to regulate overall levels of gene expression.

a mechanism for regulating prokaryotic gene expression in which the synthesis of a nascent RNA transcript is terminated before RNA polymerase has reached the structural genes.

This is the term, usually expressed as a percent, used to described a yeast's propensity to ferment available sugars. Yeast with high attenuation will yield a drier, more alcoholic final product. Yeast with low attenuation will yield a sweeter, less alcoholic product.

The drop in specific gravity that takes place as the wort ferments.

Extent to which yeast consumes fermentable sugars (converting them into alcohol and carbon dioxide).

The extent to which brewing sugars turn to alcohol and carbon dioxide.

fermentation as measured by the beginning specific gravity. Beer has reach final attenuation when the yeast can convert no more sugar.

The degree of conversion of sugar to alcohol and CO2.