Electrochemical impedance spectroscopy (EIS) is a routine tool to determine the diffusion coefficient. Albeit being versatile for varied electrochemical systems and powerful in distinguishing multiple processes in a wide frequency spectrum, the EIS method usually needs a physical model in data analysis; ...
with the initial condition in (2) and boundary conditions as stated in (3). Here, \(\beta\) represents the velocity of the flow, and \(\alpha\) is the diffusion coefficient. The concentration at the point x and at time t, denoted as u(x, t), is an unknown function. The length...
It can be effectively approximated using much simpler model of continuous time random walk (CTRW), yielding the formula which links the effec- tive diffusion coefficient to the barriers' permeability ("Bessel and gamma waiting times CTRWS" section). Next, we decouple the correlations of this ...
3Inthetable,enterthefollowingsettings: NameExpressionUnitDescription ramptanh(1E7[1/s]*t)Rampfunction T300[K]KGastemperature p10[torr]PaGaspressure Nn0p/k_B_const/T1/m³Neutralnumberdensity k11.993039e-014*dd.Te^0.9Elasticrate 3*exp(-0.41/dd.Te)coefficient ...
The paper is devoted to the study of one class of problems with nonlocal conditions for a mixed diffusion-wave equation with two independent variables. The main results of the work are the proof of regular and strong solvability, as well as the Volterra
Here we consider the escape of a particle from a potential well, and the diffusion coefficient in a periodic potential, without making these assumptions. We have thus investigated the dynamical properties of a Stochastically Driven particle that moves under the influence of the confining potential ...
(kΩ cm) B Correlation coefficient 0 wt% 1.33 × 107 2.96 × 102 0.21 0.9986 0.1 wt% 7.26 × 103 5.26 × 101 0.38 0.9895 0.25 wt% 2.65 × 103 3.57 × 101 0.51 0.9941 0.5 wt% 5.39 × 101 6.09 ×...
The challenges are due to the difference in both physical and mechanical properties involving the thermal coefficient of expansion, solidification, and melting temperature differences between the two cladded materials. Additionally, fusion cladding processes develop high residual stresses, and therefore post ...
materials Article Comparison of Standardized Methods for Determining the Diffusion Coefficient of Chloride in Concrete with Thermodynamic Model of Migration Zofia Szweda 1 , Jacek Gołaszewski 2 , Pratanu Ghosh 3, Petr Lehner 4 and Petr Konecˇný 4,* 1 Department of Building Structures, Faculty...
It was used to calculate the reaction rate constant of neurotransmitter acetylcholine (ACh) in the reaction center of the enzyme acetylcholinesterase (AChE) [41,42]. The obtained results showed that the rate coefficient depends on the concentration of the substrate (i.e., change from 2 × 1011...