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Basic Constants, Units, and Conversion Factors
Published in W. M. Haynes, David R. Lide, Thomas J. Bruno, CRC Handbook of Chemistry and Physics, 2016
W. M. Haynes, David R. Lide, Thomas J. Bruno
e neper is used to express values of such logarithmic quantities as eld level, power level, sound pressure level, and logarithmic decrement. Natural logarithms are used to obtain the numerical values of quantities expressed in nepers. e neper is coherent with the SI, but is not yet adopted by the CGPM as an SI unit. In using the neper, it is important to specify the quantity. e bel is used to express values of such logarithmic quantities as eld level, power level, sound-pressure level, and attenuation. Logarithms to base ten are used to obtain the numerical values of quantities expressed in bels. e submultiple decibel, dB, is commonly used.
Basics of Electrical Communication Systems
Published in P. S. Neelakanta, ATM Telecommunications, 2018
In terms of IL, the attenuation coefficient α is equal to IL/ℓ neper s/meter or kft. (The unit ‘neper” is named after the mathematician John Napier and “decibel” is used to honor Alexander Graham Bell; 1 neper = 8.868 dB.)
Modeling of particle size distribution and energy consumption of wet milled maize at varying soaking period and method in the production of Ogi
Published in Particulate Science and Technology, 2019
O. T. Bolaji, S. O. Awonorin, L. O. Sanni, T. A. Shittu, J. K. Adewumi
The Gaudin–Schumann equation (Equation 6 and its linearized form, Equation 7) and Rosin–Rammler–Sperling–Bennett (RRSB) (Equations 8 and 9) distribution were used to determine the size distribution:where P = mass passing (%), x = particle size in mm, k = size modulus and m = distribution modulus. The RRSB equation is as shown in Equations (8) and (9):where R = mass retained in %, x = size in mm, m = slope of the plot, (ln (100/R) vs ln x), a = size at 36.8% of particles retained (36. 8 is the ratio 100/e and e is the Neper number 2718).
Pyrolysis of milk bottle wastes of polypropylene and high density polyethylene: determination of kinetic and thermodynamic parameters
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
where e is the Neper number (2.7183), κ is transition factor (1.0), h and kB represent Plank constant (6.626 × 10−34 m2kg s−1) and Boltzmann constant (1.381 × 10−23 m2kg s−2 K−1), respectively.
Effect of coal grade and heating rate on the thermal degradation behavior, kinetics, and thermodynamics of pyrolysis of low-rank coal
Published in International Journal of Coal Preparation and Utilization, 2023
Gayatri Sabat, Narayan Gouda, Achyut K Panda
In the above equations, the Neper number is e = 2.7183, the transition factor is unity for integrated kinetic first-order reactions, the Boltzmann constant is kB, the Plank constant is h, and the Peak temperature of the DTG curve is Tp.