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logarithmic decrement
Molecular formula :

nature : in a single oscillation frequency attenuation, any two (or more) consecutive symbols the same ratio of the amplitude of the natural logarithm. Dimensionless number can be expressed as :, the opening An and An + k-- twice the amplitude of oscillation (corner); K - ; - two independent measurements separated by the inter-amplitude oscillation of a few. If the damper is not great, and the loss factor λ d simplify the relationship : d λ = π. It is a viscoelastic material and dynamic measurement of an important parameter, the energy loss is the size of the symptoms.

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1) attenuance
2) 2-Chloro-N,N-diethylethaneamine hydrochloride;2-Chlorotriethylamine hydrochloride;DEC;2-Diethylaminoethylchloride hydrochloride
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