Activation Energy Research Papers - Academia.edu (original) (raw)

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- by Nazdaneh Yarahmadi
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- Materials Engineering, Chemical Engineering, Carbon Dioxide, Kinetics
- by MP Kannan
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- Chemistry, Kinetics, Activation Energy, Nitrogen
- by Mohamed Abo Gabal
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- Materials Science, Activation Energy, Kinetic, CHEMICAL SCIENCES

The electrical properties of double perovskite Ho2NiTiO6 (HNT) are investigated by impedance spectroscopy in the temperature range 30–420 °C and frequency range 100 Hz to 1 MHz. The X-ray diffraction analysis reveals that the compound crystallizes in monoclinic phase. The imaginary part of impedance (Z″) as a function of frequency shows Debye type relaxation. The frequency dependence of Z″ peak is found to obey an Arrhenius law with an activation energy of 0.129 eV. Impedance data presented in the Nyquist plot (Z″ vs. Z′) are used to identify an equivalent circuit and to know the bulk and interface contributions. The complex impedance analysis of HNT exhibits the appearance of both the grain and grain-boundary contribution. The results of bulk ac conductivity as a function of temperature and frequency are presented. The activation energy (0.129 eV), calculated from the slope of log τ versus 103/T plot, is found to be the nearly same as calculated (0.130 eV) from dc conductivity. The frequency dependent conductivity spectra obey the power law.

- by Alo Dutta
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- Engineering, Materials Science, Impedance Spectroscopy, Power Law
- by Folahan Adekola
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- Engineering, Activation Energy, Comparative Analysis, Mathematical Model
- by K. Chandran
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- Materials Engineering, Mass Spectrometry, Nuclear Materials, Nuclear
- by Juan Conesa
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- Analytical Chemistry, Kinetics, Activation Energy, Nitrogen
- by Subhash Kashyap
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- Materials Engineering, Materials Science, Zinc Oxide, DIELECTRIC
- by ebtesam el farhatey
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- Materials Engineering, Materials Science, Materials Chemistry, X Rays
- by Guangjun Lu
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- Materials Science, LED, Activation Energy, Luminaire

In this study an artificial neural network (ANN) model was developed to predict the oxidation behavior of magnesia graphite composites. After mechanism evaluation in different conditions, the kinetic parameters such as effective diffusion coefficient and diffusion activation energy of oxidation were calculated from ANN predicted results at different graphite content. The obtained mechanism and kinetic parameters were compared with experimental data.First of all, the reliability of the model was checked with different available data. It was found that the model results were in good agreement with experimental data prediction.The results showed that the main mechanism of oxidation was pore diffusion and effective diffusion coefficient as well as diffusion activation energy were comparable with previous works.Effective diffusion coefficient and diffusion activation energy which were calculated versus graphite content are in good agreement with experimental values.

- by Ziarat Nemati
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- Materials Engineering, Condensed Matter Physics, Chemistry, Computational Materials Science
- by P S G KRISHNAN
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- Free Radical, Activation Energy, Thermal, Thermal Analysis
- by mut tha
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- Logic, Data Analysis, Energy Saving, Activation Energy
- by Heribert Watzke
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- Engineering, Thermodynamics, Protein adsorption, Kinetics
- by pankaj tiwari
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- Mechanical Engineering, Chemical Engineering, Kinetics, Mass Spectrometry
- by Kevin M Shakesheff
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- Engineering, Processing, Viscosity, Activation Energy
- by Shyam Sablani and +1
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- Food Engineering, Kinetics, Food, Activation Energy
- by Antonio Cerdeira
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- Activation Energy, Electrical And Electronic Engineering
- by Eran Rabani
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- Engineering, Chemical Physics, Physical sciences, Activation Energy
- by Önder Pekcan and +1
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- Engineering, Materials Science, Free Radical, Activation Energy
- by Marco Garavelli
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- Technology, Chemical Physics, Physical sciences, Activation Energy
- by Zdenek Dohnálek
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- Chemical Engineering, Heterogeneous Catalysis, Alcohol, Activation Energy
- by Rasit Koc
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- Engineering, Materials Science, Activation Energy, CHEMICAL SCIENCES
- by Bahij Sakakini
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- Chemical Engineering, Catalysis, Infrared spectroscopy, Activation Energy
- by Mohammad Hossein Keshavarz
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- Engineering, Prediction, Safety, Correlation
- by Bambang Veriansyah
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- Engineering, Water, Kinetics, Power Law
- by Klaus Vogel
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- Chemical Engineering, Analytical Chemistry, Pyrolysis, Activation Energy
- by Candan Hamamci and +1
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- Particle Physics, Kinetics, Activation Energy, Nitrogen
- by J. Sánchez-Oneto and +1
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- Chemical Engineering, Kinetics, Activation Energy, First-Order Logic
- by Kyung Hun Yoon
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- Electronic Materials, Secondary Ion Mass Spectrometry, Activation Energy, Low Temperature
- by zorica kacarevic-popovic
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- Materials Engineering, Chemical Engineering, Materials Science, POlymer degradation and stability
- by Semaan Georges
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- Materials Engineering, Condensed Matter Physics, Microstructure, Density

The kinetic consequences of resonance tunnelling processes that may occur in chemical reactions are investigated in terms of a multi-centered unsymmetrical Eckart potential barrier. This potential function does not only simulate the possible existence of intermediate wells in the effective potential energy cut along the reaction path, but also is amenable to analytic solutions. The reaction rate as well as its dependence on temperature, reduced mass,Q-value, activation energy and barrier diffuseness are evaluated for successively increasing the number of barrier stages. Comparisons between results due to single and multi-humped potential energy barriers are made and discussed.

- by Ali Rabie
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- Chemistry, Kinetics, Chemical Kinetics, Activation Energy
- by Marcel J M Poulain
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- Analytical Chemistry, Glass, Stability, Nucleation
- by Christian Roy
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- Engineering, Kinetics, Modeling, Rheology
- by Ravindra Nath Singh
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- Materials Engineering, Analytical Chemistry, Sensor, Nanoparticle
- by Ismat Shah
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- Engineering, Materials Science, Thermodynamics, Scanning Electron Microscopy
- by Rafael Cossiello
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- Materials Engineering, Chemical Engineering, Physics, Materials Science
- by Pasquale Falcone
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- Food Engineering, Evaluation, Analysis, Models
- by Muhamad Azizan
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- Condensed Matter Physics, Quantum Physics, Surface Science, Activation Energy
- by Robin Drew
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- Materials Engineering, Mechanical Engineering, Mass Transfer, Kinetics
- by Alan Weimer
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- Engineering, Heat Transfer, Zinc Oxide, Solar Energy
- by U. Shivhare
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- Kinetics, Gibbs Free Energy, Activation Energy, First-Order Logic
- by Agoston Boroczki
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- Materials Engineering, Heat Treatment, Activation Energy

Siliceous, aluminosilicate and niobosilicate mesoporous molecular sieves of MCM-41 type have been used as matrices for nickel incorporated via the wet impregnation. The N 2 adsorption, XRD, H 2 -TPR and Ni dispersion study were applied... more

- by M. Ziolek
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- Chemical Engineering, Kinetics, Molecular, Molecular Sieve
- by Skhulile Maseko
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- Chemistry, Activation Energy, Structure Analysis, X ray diffraction
- by Eduardo Donoso
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- Kinetics, Differential scanning calorimetry, Quenching, DSC

Activation Energy Research Papers - Academia.edu (original) (raw)

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