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Qu'est-ce (qui) est attenuation - définition

GRADUAL LOSS OF FLUX INTENSITY THROUGH A MEDIUM

Attenuate; Natural attenuation; Attenuating; Attenuation (electromagnetic radiation); Attentuate; Ultrasound attenuation; Extinction (physics); Optical extinction; Ultrasonic attenuation; Seismic attenuation

attenuation

<communications> The progressive reduction in amplitude of a signal as it travels farther from the point of origin. For example, an electric signal's amplitude reduces with distance due to electrical impedance. Attenuation is usually measured in decibels [per metre?]. Attenuation does not imply appreciable modification of the shape of the waveform (distortion), though as the signal amplitude falls the signal-to-noise ratio will also fall unless the channel itself is noise free or the signal is amplified at some intermediate point(s) along the channel. ["Networking Essentials, second edition", Microsoft Corporation, pub. Microsoft Press 1997]. (2003-07-29)

attenuation

n.

1.

Thinning, diminishing, rarefying, making thin, thread-like, or slender.

2.

Thinness, thread-likeness, slenderness, emaciation, slender elongation, extreme slenderness.

Attenuation

·noun The act or process of making slender, or the state of being slender; emaciation.

II. Attenuation ·noun The process of weakening in intensity; diminution of virulence; as, the attenuation of virus.

III. Attenuation ·noun The act of attenuating; the act of making thin or less dense, or of rarefying, as fluids or gases.

Wikipédia

Attenuation

In physics, attenuation (in some contexts, extinction) is the gradual loss of flux intensity through a medium. For instance, dark glasses attenuate sunlight, lead attenuates X-rays, and water and air attenuate both light and sound at variable attenuation rates.

Hearing protectors help reduce acoustic flux from flowing into the ears. This phenomenon is called acoustic attenuation and is measured in decibels (dBs).

In electrical engineering and telecommunications, attenuation affects the propagation of waves and signals in electrical circuits, in optical fibers, and in air. Electrical attenuators and optical attenuators are commonly manufactured components in this field.

https://en.wikipedia.org/wiki/Attenuation

Exemples du corpus de texte pour attenuation

1. Examples could be multiplied endlessly, with the collective effect of highly significant attenuation of overall humanitarian efficacy and capacity.

2. Right now, no growth–attenuation therapy is being administered by other doctors anywhere in the nation, according to Diekema and confirmed by other pediatric experts.

3. We will see, as a consequence, the continuing attenuation of relief efforts, including evacuations, severe travel restrictions in moving humanitarian supplies and personnel, and even the withdrawal of international workers from Darfur.

4. August, traditionally the month of heaviest rains, saw a further attenuation of relief efforts, as transport of food and other critical supplies became mired in flooded riverbeds and blocked by severed road arteries.

5. An Overview Disturbing trends suggest further attenuation of humanitarian relief By Eric Reeves April 7, 2005 –– All signs are that physical security for humanitarian operations in Darfur continues to deteriorate at a very serious rate.