The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform

Jan Mocak - One of the best experts on this subject based on the ideXlab platform.

  • voltammetric current potential calculations using Infinite Series Solution
    Electrochemistry Communications, 2002
    Co-Authors: Jan Mocak
    Abstract:

    Highly accurate analytical Solution contributing to the theory of linear sweep voltammetry for single scan experiments is given by application of exponential Infinite Series. The cases of reversible or irreversible charge transfer with or without coupled chemical reaction are treated and calculated results are compared with the customary Solution of Nicholson and Shain. Problems with partial divergence of the Series were overcome by the Series transformation and the use of arbitrary precision arithmetic.

  • Voltammetric current–potential calculations using Infinite Series Solution
    Electrochemistry Communications, 2002
    Co-Authors: Jan Mocak
    Abstract:

    Highly accurate analytical Solution contributing to the theory of linear sweep voltammetry for single scan experiments is given by application of exponential Infinite Series. The cases of reversible or irreversible charge transfer with or without coupled chemical reaction are treated and calculated results are compared with the customary Solution of Nicholson and Shain. Problems with partial divergence of the Series were overcome by the Series transformation and the use of arbitrary precision arithmetic.

Dipali D Jagtap - One of the best experts on this subject based on the ideXlab platform.

  • mathematical modeling and experimental study on thin layer vacuum drying of ginger zingiber officinale r slices
    Food and Bioprocess Technology, 2012
    Co-Authors: Indrajit D Thorat, Debabandya Mohapatra, R F Sutar, S S Kapdi, Dipali D Jagtap
    Abstract:

    The vacuum-drying characteristics of ginger (Zingiber officinale R.) slices were investigated. Drying experiments were carried out at a constant chamber pressure of 8 kPa, and at four different drying temperatures (40 °C, 50 °C, 60 °C, and 65 °C).The effects of drying temperature on the drying rate and moisture ratio of the ginger samples were evaluated. Efficient model for describing the vacuum-drying process was chosen by fitting five commonly used drying models and a suggested polynomial was fitted to the experimental data. The effective moisture diffusivity and activation energy were calculated using an Infinite Series Solution of Fick’s diffusion equation. The results showed that increasing drying temperature accelerated the vacuum-drying process. All drying experiments had only falling rate period. The goodness of fit tests indicated that the proposed two-term exponential model gave the best fit to experimental results among the five tested drying models. The average effective diffusivity values varied from 1.859 × 10−8 to 4.777 × 10−8 m2/s over the temperature range. The temperature dependence of the effective moisture diffusivity for the vacuum drying of the ginger samples was satisfactorily described by an Arrhenius-type relationship with activation energy value of 35.675 kJ/mol within 40–65 °C temperature range.

Akio Tagawa - One of the best experts on this subject based on the ideXlab platform.

  • Vacuum drying characteristics of eggplants
    Journal of Food Engineering, 2007
    Co-Authors: Takahiro Orikasa, Yukiharu Ogawa, Akio Tagawa
    Abstract:

    Abstract The vacuum drying characteristics of eggplant were investigated. Drying experiments were carried out at vacuum chamber pressures of 2.5, 5 and 10 kPa, and drying temperature ranging from 30 to 50 °C. The effects of drying pressure and temperature on the drying rate and drying shrinkage of the eggplant samples were evaluated. The suitable model for describing the vacuum drying process was chosen by fitting four commonly used drying models and a suggested polynomial model to the experimental data; the effective moisture diffusivity and activation energy were calculated using an Infinite Series Solution of Fick’s diffusion equation. The results showed that increasing drying temperature accelerated the vacuum drying process, while drying chamber pressure did not show significant effect on the drying process within the temperature range investigated. Drying shrinkage of the samples was observed to be independent of drying temperature, but increased notably with an increase in drying chamber pressure. A linear relationship between drying shrinkage ratio and dry basis moisture content was observed. The goodness of fit tests indicated that the proposed polynomial model gave the best fit to experimental results among the five tested drying models. The temperature dependence of the effective moisture diffusivity for the vacuum drying of the eggplant samples was satisfactorily described by an Arrhenius-type relationship.

Claude Montella - One of the best experts on this subject based on the ideXlab platform.

  • local global admittance of blocking disk electrode computation and discussion 1 Infinite Series Solution
    Journal of Electroanalytical Chemistry, 2015
    Co-Authors: Richard Michel, Claude Montella
    Abstract:

    Abstract This article mainly focuses on the local and global admittances of a disk electrode embedded in an Infinite insulating plane, in the absence of faradaic reaction, so-called blocking disk electrode. The mathematical formalism involved starts from Newman’s model for the distribution of potential in the electrolytic Solution surrounding the electrode, together with non-uniform current distribution on the disk. Computation is performed in this work using symbolic and numerical procedures within a computer algebra system in order to produce highly accurate admittance/impedance data. The local and global admittances of blocking disk electrode are investigated more especially, with regards to high- and low-frequency behaviors. Computed data are compared, first, to the effective values of resistance and capacitance tabulated by Newman, next, to the apparent constant-phase-element behavior of electrode impedance predicted by Huang et al. at high frequencies, and, finally, to the impedance results recently obtained by Tjelta and Sunde. The accuracy of admittance/impedance data is improved in this work, mainly at high frequencies. Finally, interfacial and ohmic contributions to the global impedance of disk electrode are computed and discussed. Additional information about the admittance/impedance of disk electrode is reported in the supplementary material associated with this article.

  • Local/global admittance of blocking disk electrode. Computation and discussion. 1-Infinite Series Solution
    Journal of Electroanalytical Chemistry, 2015
    Co-Authors: Richard Michel, Claude Montella
    Abstract:

    Abstract This article mainly focuses on the local and global admittances of a disk electrode embedded in an Infinite insulating plane, in the absence of faradaic reaction, so-called blocking disk electrode. The mathematical formalism involved starts from Newman’s model for the distribution of potential in the electrolytic Solution surrounding the electrode, together with non-uniform current distribution on the disk. Computation is performed in this work using symbolic and numerical procedures within a computer algebra system in order to produce highly accurate admittance/impedance data. The local and global admittances of blocking disk electrode are investigated more especially, with regards to high- and low-frequency behaviors. Computed data are compared, first, to the effective values of resistance and capacitance tabulated by Newman, next, to the apparent constant-phase-element behavior of electrode impedance predicted by Huang et al. at high frequencies, and, finally, to the impedance results recently obtained by Tjelta and Sunde. The accuracy of admittance/impedance data is improved in this work, mainly at high frequencies. Finally, interfacial and ohmic contributions to the global impedance of disk electrode are computed and discussed. Additional information about the admittance/impedance of disk electrode is reported in the supplementary material associated with this article.

Indrajit D Thorat - One of the best experts on this subject based on the ideXlab platform.

  • mathematical modeling and experimental study on thin layer vacuum drying of ginger zingiber officinale r slices
    Food and Bioprocess Technology, 2012
    Co-Authors: Indrajit D Thorat, Debabandya Mohapatra, R F Sutar, S S Kapdi, Dipali D Jagtap
    Abstract:

    The vacuum-drying characteristics of ginger (Zingiber officinale R.) slices were investigated. Drying experiments were carried out at a constant chamber pressure of 8 kPa, and at four different drying temperatures (40 °C, 50 °C, 60 °C, and 65 °C).The effects of drying temperature on the drying rate and moisture ratio of the ginger samples were evaluated. Efficient model for describing the vacuum-drying process was chosen by fitting five commonly used drying models and a suggested polynomial was fitted to the experimental data. The effective moisture diffusivity and activation energy were calculated using an Infinite Series Solution of Fick’s diffusion equation. The results showed that increasing drying temperature accelerated the vacuum-drying process. All drying experiments had only falling rate period. The goodness of fit tests indicated that the proposed two-term exponential model gave the best fit to experimental results among the five tested drying models. The average effective diffusivity values varied from 1.859 × 10−8 to 4.777 × 10−8 m2/s over the temperature range. The temperature dependence of the effective moisture diffusivity for the vacuum drying of the ginger samples was satisfactorily described by an Arrhenius-type relationship with activation energy value of 35.675 kJ/mol within 40–65 °C temperature range.