“semi-empirical” models have been developed, based on a mix of mass and energy balance equations, equations linking electrical and physical variables, and some empirical equations, which are able to predict th
Although the electrophoretic mobilities of the ions affect the ion fluxes and the electric current passage across the membrane, when electrotransport is operated under the constant voltage condition, the shapes of the ion concentration profiles are relatively independent of the electromobilities of the ...
where, vgd and vgq, are the (d-q) grid voltage components, igd and igq are the grid currents, vld and vlq, are the voltage components at the PCC point, and ω is the grid frequency. Assuming that the quadratic current and voltage of the grid are zero(igq=0andvgq=0), the amount...
The quantity Z = p1/υ1, homologous to an electric impedance in the electrical analogy of acoustics (where velocity and pressure are considered to be equivalent respectively to current and voltage), is called the acoustic impedance of the wave. The quantity Z0 = ρ0c0, characteristic of the ...
The accuracy of the scheme is the first order in time and second order on space. The condition for consistency may be restated: a scheme is consistent if the truncation error tends to zero for Δt and Δx tending to zero. 11.2.3.2 Stability The stability condition is a requirement solely...
Early in the 20th century, Lewis Fry Richardson, a British mathematician, formulated numerical approximations for the general circulation of the atmosphere and in 1922 published Weather Prediction by Numerical Process. At a time long before the advent of computers, he tried to imagine how it might...
Two electric and two magnetic field measures are used in Maxwell's equations. If you sense a voltage difference in a circuit, you are observing the presence of an E or electric field. Maxwell and TRANSMISSION LINES: The famous mathematician can guide our understanding of electrical signals 'FDTD...
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A mathematical calculation of the total amount of creatinine excreted in the urine over a period of time, usually 24 hours to test renal function. The calculation is: creatinine clearance (mL/minute) = urine creatinine concentration (mL/dL) × volume of urine (mL/24 hour) ÷ plasma creatinin...
model of the cylindrical cell and the theory of computation of the ratio of the magnitudes of current and voltage based on that model make possible experimental determination of the electrical parameters of the cell membrane and evaluation of the conditions of propagation of subliminal electric ...