logarithm

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log·a·rithm

(log'ă-ridhm),
If a number, x, is expressed as a power of another number, y, that is, if x = yn, then n is said to be the logarithm of x to base y. Common logarithms are to the base 10; natural or Napierian logarithms are to the base e, a mathematical constant.
[G. logos, word, ratio, + arithmos, number]
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References in periodicals archive ?
Most common used are bridge natural frequency, bridge logarithmical decrement and bridge acceleration and dynamic amplification factor (DAF).
The three terminal npn bipolar junction transistor (BJT) in the active region of operation could implement F exponential and [F.sup.-1] logarithmical building blocks in a similar connection as in Fig.
After logarithmical and derivative (2) we take (13).
For 56% of those with a modified correction, there was an improvement in distance visual acuity of at least one logarithmical step (or one line on the acuity chart); for 1 person, distance visual acuity improved seven logarithmical steps.
The cardiac vagal reactivity in response to orthostasis was evaluated as percentual change of logarithmical spectral power in high frequency band (as index of vagal modulation) using mathematical expression: [(logHF power in standing position--logHF power in the 1st supine position) / logHF power in the 1st supine position] x 100 (%).
--Bottom region with linear temperature profile and upper region which is temperature variation in shape logarithmical approximately.
10) were calculated for 67 values of r spread over the interval <4, 75> equidistantly in logarithmical scale, and for 15 values of q equidistantly spread in the interval <0, 15> giving a total of 1005 features for each image.
The calculation of I[C.sub.50] values was performed by a semilogarithmical presentation and logarithmical regression analysis.
To detect a non-linear relationship between spatial visualization and mathematical achievement, natural logarithmical and quadratic transformations of the variables were conducted, introducing the transformed variables in the regression analyses.