نتایج جستجو برای: arrhenius equation

تعداد نتایج: 232044  

Journal: :Fizika tverdogo tela 2022

The molecular mobility of films thermoplastic aromatic polyimides and nanocomposites based on them with 3% cerium dioxide has been studied by dielectric spectroscopy. Three relaxation regions dipole polarization were found for the initial polyimides, γ β (in glassy state) α (transition to a highly elastic state).The introduction into matrix polyimide leads suppression process appearance in spec...

Journal: :journal of agricultural science and technology 2012
z. ashraf z. hamidi m. a. sahari

the drying behavior and characteristics of date paste were studied at temperatures of 60, 70, and 80ºc as thin layer with sample thicknesses of 1, 1.5, and 2 cm in a laboratory scale vacuum chamber. modeling of drying kinetics of date paste was investigated based on the specific temperatures and sample thicknesses. the experimental moisture loss data were fitted to eight thin layer drying model...

Journal: :Applied biochemistry and biotechnology 1998
S Desmons H Krhouz P Evrard P Thonart

The production of Lactobacillus brevis has been improved by changing the medium composition and the physiological conditions. The cellular concentration reaches 8.2 x 10(10) cells/mL in 21 h with a fed-batch technique in MRS medium. Freeze-drying has been used as technology for drying the cells and survival rates have been improved with different additives such as glycerol, CaCO3, and skimmed-m...

1999
G. R. Nash J. F. W. Schiz C. D. Marsh P. Ashburn G. R. Booker

The transport of ion-implanted F in amorphous Si is studied using secondary ion mass spectroscopy and transmission electron microscopy. Significant redistribution of F is observed at temperatures in the range 600–700 °C. The measured F depth profiles are modeled using a simple Gaussian solution to the diffusion equation, and the diffusion coefficient is deduced at each temperature. An activatio...

2000
S. GRABOWSKI K. KADAU P. ENTEL

We present molecular-dynamics simulations of self-diffusion in Al. In order to facilitate the description of elastic and vibrational properties as well as vacancy migration, an embedded-atom method potential was used in the simulations. This potential was specifically designed to reproduce the T = 0 K equation of state of Al obtained by ab initio total-energy calculations. We show that the temp...

Journal: :Physical review letters 2017
Juan J Mazo Dirk Dietzel Andre Schirmeisen J G Vilhena Enrico Gnecco

We demonstrate how an exponentially saturating increase of the contact area between a nanoasperity and a crystal surface, occurring on time scales governed by the Arrhenius equation, is consistent with measurements of the static friction and lateral contact stiffness on a model alkali-halide surface at different temperatures in ultrahigh vacuum. The "contact ageing" effect is attributed to atom...

Journal: :CoRR 2015
A. M. Brener L. M. Musabekova

The first considered problem is the problem of arising dynamic dissipative structures in the chemical reactor volume. The mathematical model of heat and mass transfer in the tubular through-reactors has been submitted. The model consists of the diffusion-kinetic equations for two reagents under the first-order reversible reaction and heat transfer equation with allowance for the latent heat of ...

Journal: :Physical review letters 2006
Aaron Fleet Darren Dale A R Woll Y Suzuki J D Brock

We grew SrTiO3 on SrTiO3(001) by pulsed laser deposition, using x-ray scattering to monitor the growth in real time. The time-resolved small-angle scattering exhibits a well-defined length scale associated with the spacing between unit-cell high surface features. This length scale imposes a discrete spectrum of Fourier components and rate constants upon the diffusion equation solution, evident ...

Journal: :Journal of biomedical optics 2011
Clifton D Clark Michael L Denton Robert J Thomas

We propose a rate process model for describing photochemical damage to retinal cells by short wavelength laser exposures. The rate equation for photochemical damage contains a positive rate that is temperature independent, and a negative (quenching) rate that is temperature dependent. Using the traditional Arrhenius integral to describe thermal damage, we derive damage threshold doses for both ...

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