Mechanical activation in mechanical removal of GaN using diamond tip and mechanochemical Al2O3 are described by the Archard equation mechanically assisted Arrhenius-type kinetic model, respectively. Evident material-removal under elastic contact occurs with assistance interfacial reactions. By analyzing reactions model Hertzian mechanics, critical volume barrier determined semiquantitatively. T...

The divalent cation ionophore A23187 has been used to examine the steady state kinetics of energy-dependent Ca2+ uptake with /3-hydroxybutyrate as oxidizable substrate, and these results have been compared to the kinetic parameters obtained with succinate as the available energy source. The kinetics are sigmoidal with the free Ca*+ concentration at half-maximal respiratory stimulation (K,,,,) e...

BACKGROUND This paper provides some clarifications regarding the use of model-fitting methods of kinetic analysis for estimating the activation energy of a process, in response to some results recently published in Chemistry Central journal. FINDINGS The model fitting methods of Arrhenius and Savata are used to determine the activation energy of a single simulated curve. It is shown that most...

In the present work, a multiscale post-seismic relaxation mechanism, based on existence of distribution in time, is presented. Assuming an Arrhenius dependence time with uniform distributed activation energy mesoscopic scale, generic logarithmic-type macroscopic scale results. The model was applied case strong 2015 Lefkas Mw6.5 (W. Greece) earthquake, where continuous GNSS (cGNSS) series were r...

catalysts with the formula of laco(1+x)o(3+δ), where 0 ≤ x ≤ 1, were studied for oxidation of co and c2h6 in a synthetic exhaust gas, comprising 6.0 % co and 0.2 % c2h6 in ar. ethane was selected as a model for hydrocarbons in the exhaust gas. the performance of catalysts is correlated to their properties, particularly their redox in oxidizing and reducing atmospheres. xrd patterns show perovsk...

gasification is a well-known reaction owing to its relevance to generation of sustainable energyfrom biomass and development of porous carbons. the present paper attempts to experimentally investigate the kinetics of palm shell char gasification using carbon dioxide (co2) in a controlled environment using thermo gravimetric analyzer (tga) at temperatures ranging from 800 to1000°c. a relevant ki...

Our aim was to elucidate the physical background of internal friction of enzyme reactions by investigating the temperature dependence of internal viscosity. By rapid transient kinetic methods, we directly measured the rate constant of trypsin 4 activation, which is an interdomain conformational rearrangement, as a function of temperature and solvent viscosity. We found that the apparent interna...

We present results from kinetic Monte Carlo (KMC) simulations of diffusion in a model glass former. We find that the diffusion constants obtained from KMC simulations have Arrhenius temperature dependence, while the correct behavior, obtained from molecular dynamics simulations, can be super-Arrhenius. We conclude that the discrepancy is due to undersampling of higher-lying local minima in the ...

Coal gasification with carbon dioxide is a process for generating clean gaseous fuels and relieving greenhouse effect. Zhundong coal has high alkali and alkali earth metals (AAEMs) content, medium volatile and low ash in nature. Isothermal CO2 gasification of char derived from Zhundong coal (R-char) and char from acid washing R-char (AR-char) are performed in thermo-gravimetric analyzer (TGA). ...

Deuterium quadrupole spin-echo spectra have been obtained at 12 temperatures between 103 and 303 K for deuterated derivatives of biphenyl in polycrystalline /3-cyclodextrin clathrates. Reorientation of biphenyl in the clathrate channel may be modelled by constructing a grid of positions for the p,p'-axis and using a multisite simulation program to calculate spectra for different patterns of sit...