Conductivities expressed

Conductivity Expressed as micromhos, specific conductance Conductivity is the result of ionizable solids in solution high conductivity can increase the corrosive characteristics of a water Any process which decreases dissolved solids content will decrease conductivity examples are demineralization, lime softening... 

Furlan, F., Taccola, G., Grandolfo, M., Guasti, L., Arcangeli, A., Nistri, A. and Ballerini, L. (2007) ERG conductance expression modulates the excitability of ventral horn GABAergic interneurons that control rhythmic oscillations in the developing mouse spinal cord. Journal of Neuroscience, 27, 919-928. 

Data of sufficient precision to be treated by the Fuoss-Onsager conductance expression yield, in addition to values for A0 and KA, an ion size param-... 

The high-temperature transport data has been well rationalized 0 on the basis of a diffusional model with AH = 0.16 eV for all x, which is an agreement with localized Fe " -ion configurations responsible for a cooperative Jahn-Teller distortion below Tn. The ratio (1 - c)/c obtained from Eq. (15) for the Seebeck coefficient, with a spin-degeneracy factor P = 2, gives the factor c(l — c) entering the conductivity expression... 

This Prandtl-number expression is independent of temperature, since both the viscosity and conductivity expressions have the same temperature dependence. For monatomic gases, y as 5/3, so the expression shows Pr 0.67, which is close to that observed experimentally. For diatomic gases with y = 1.4, the expression yields Pr = 0.74, which is a bit high. 

These two expressions differ only by the leading constant terms. The simple thermal conductivity expression derived here is roughly 40% the size of the rigorous result. It captures the functional dependence on temperature, molecular mass, heat capacity, and pressure (independent of pressure) of the exact result. Experimentally the thermal conductivity is generally found to be independent of pressure, except at very low pressures. The thermal conductivity is predicted to increase as the square root of temperature, which somewhat underestimates the actual temperature dependence. Consideration of interactions between molecules, as in the next section, brings the temperature dependence into better accord with observation. 

In the presence of reversible trapping, according to the altered conductivity expression in Eq. (91), there can now be a chemical diffusion of oxygen even if creon = 0, simply by a neutral oxygen flux but also by a counterflux of CF and 20 . The modifications referring to the d//0/dc0 term have been shown to have extremely... 

An alternative expression for the maximum radius of influence is that given by Morrison and Szecsody (1985), which was derived from Eq. (10.2) but with k (unsaturated hydraulic conductivity) expressed as a function of the hydraulic head (see also Hart el al., 1994 and Hart and Lowery, 1997) ... 

The mobilities of the ions are assumed to be unaffected by the composition in RS model which therefore makes cr oc c in the conductivity expression a= cefi. Therefore,... 

However there are problems with the Hendrickson-Bray approach. The pre-exponential factor cr in the conductivity expression is assumed... 

Solution of the Equations—The object before us is to calculate, m the case of a strong electrolyte such as KC1, the osmotic pressure exerted by the undissociated molecules and by the 10ns (as distinct from the molecules) m older to see whether one sort or both sorts deviate from van t Hoff s law, and thereby cause the law of mass action to be inapplicable It is assumed that the concentration of the 10ns Ct and of the undissociated molecules C can be obtained accurately from the conductivity expression, the symbol y being used to denote the ionisation coefficient determined by this method When the terms C, and C occur, it is to be understood that they are determined directly by conductivity At the same time we require to know the total osmotic pressure tr of the solution and this is to be understood as directly obtainable from the freezing point data by means of equation (4)... 

In order to appreciate the difference between the values of a given in the table (p 227) and the values of y obtained from the conductivity expression the reader is referred to the measurements of Noyes and Falk, part of whose data have already been given in Vol I... 

Fig. 1-17. Evaluation of Tokunaga and Wan s (1997) experimental results with unsaturated hydraulic conductivity expressions for single element weighed by 5 = 0.1.

At 1000 K, the preexponential term yields a value of 4.07 x lO S/m, which is in fairly close agreement with the preexponential term in the conductivity expression shown above. The fit is even better at higher temperatures. These results unambiguously prove that conduction in calcia-stabilized zirconia occurs by the movement of oxygen ions. 

The model describing the partially saturated porous materials is composed of three balance equations. They express water mass conservation, air mass conservation and energy conservation. They can be found in Chavant (2001). The capillary pressure, the gas pressure and the temperature have been chosen as the main variables of the system. The three conservation equations are non-linear and coupled. As an example, these notions are explained on liquid conductivity expression, written as equation 3 ... 

Michel, S., M.E. Geusz, J.J. Zaritsky G.D. Block. 1993. Circadian rhythm in membrane conductance expressed in isolated neurons. Science 259 239-41. 

U and V are contributions to equivalent conductivity expressed in reciprocal ohms u and v are absolute speeds expressed in cm./sec. under a potential gradient of 1 volt/cm. 

Three things must be pointed out at this time At first there is an additional component of heat transfer due to diffusion from the air stream through the porous frost which must be added to the derived conductivity expression this component appears to be proportional to the rate mjAy but disappears when the frost becomes sufficiently dense (indicated by the increased conductivity shown in Fig. 8). At about the same time, the expression for density (10) also breaks dowm and the net mass transfer becomes much smaller due to melting, dripping, etc. Some of the runs checked seemed to go through this transition at a density of about 35 Ib/ft. Exact expressions for frost properties will be difficult to obtain because we have observed two kinds of frost on the test section where the boundary line was at the separation point on the cylinder. In fact, Pingry, et al. p] reports three kinds of frost formation and the data tend to indicate that the properties differ somewhat for the different kinds of frost. 

The reciprocal of resistance is conductance, expressed as ohm or mhos, and the reciprocal of resistivity is specific conductance or conductivity expressed as ohm -cm . ... 

The dissociated fraction of the electrolyte, a, is commonly obtained from conductivity data, although other techniques have also been widely employed. In the case of the conductivities, expression (2.19) is replaced by ... 

For a completely dissociated electrolyte, the appropriate equivalent conductivity expression, A = follows... 

This is not a simple model because the dipole conductance is dependent on the pole efforts, even when the pole conductances are scalar, at least as long as the pole conductances are different. In the linear case, the conductance expression keeps the same shape ... 

From the first relation 8.113 one may express the pole effort and then it can be introduced in the pole conductance expression 8.112 ... 

K-factor K-factor is a term sometimes used for the thermal insulation value or coefBcient of thermal conductivity. It is numerically equivalent to the thermal conductivity expressed in British units (BTU in.)/(ft h°FA and its inverse (1/K) is known as the R-factor. K-factors and R-factors are commonly used for thermal insulating materials such as plastic foam. 

The numeric value of the thermal conductivity expressed in British units is sometimes referred to as the K-factor, and its inverse (1/K) as the R-factor. 

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