Arrhenius Plot
Mostrando 1-12 de 56 artigos, teses e dissertações.
-
1. Estudio comparativo entre la difusión de Uranio en Zry-4 y en Zr-α puro
ABSTRACT Throughout the α-spectrometry U diffusion in pure Zry-4 was studied and compared with pure α-Zr in the temperature range 843-1093 K in order to analyze the diffusion process in both matrices. D values are systematically higher in Zry-4 and its temperature dependence obeys the Arrhenius law being: D0 = (3,2 ± 1,1) m2/s and Q = (316 ± 9) kJ mol-1,
Matéria (Rio J.). Publicado em: 19/07/2018
-
2. Estudio comparativo entre la difusión de U en Zry-4 y en Zr-α puro
ABSTRACT Throughout the α-spectrometry U diffusion in pure Zry-4 was studied and compared with pure α-Zr in the temperature range 843-1093 K in order to analyze the diffusion process in both matrices. D values are systematically higher in Zry-4 and its temperature dependence obeys the Arrhenius law being: D0 = (3,2 ± 1,1) m2/s and Q = (316 ± 9) kJ mol-1,
Matéria (Rio J.). Publicado em: 19/07/2018
-
3. The inhibitory action of Bauhinia purpurea extracts on the corrosion of carbon steel in sulfuric acid medium
The inhibitory effect of Bauhinia purpurea (Fabaceae) extract was studied in the corrosion of carbon steel in 1.0 mol∙L-1 sulfuric acid solution. This plant was collected from the Brazilian rainforest. The carbon steel protection was observed by varying the extract concentration from 50 to 500 mg∙L-1. Polarization curves revealed that this extract acted
Mat. Res.. Publicado em: 12/02/2016
-
4. Estudos sobre as propriedades catalíticas da frutosiltransferase de Rhodotorula sp. livre e imobilizada em suporte inorgânico / Catalytic properties of fructosyltransferase from Rhodotorula sp., free and immobilized on inorganic support
A obtenção de fruto-oligossacarídeos (FOS), um açúcar prebiótico de vasta aplicação industrial, por enzimas imobilizadas abrange dois conceitos em grande expansão: aplicação industrial de enzimas imobilizadas e alimentos funcionais. A partir de flores da Mata Atlântica Brasileira uma cepa foi isolada e identificada como Rhodotorula sp. LEB-V10 e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/02/2012
-
5. Isothermal seed germination of Adenanthera pavonina
This work reports aspects of seed germination at different temperatures of Adenanthera pavonina L., a woody Southeast Asian Leguminosae. Germination was studied by measuring the final percentages, the rate, the rate variance and the synchronisation of the individual seeds calculated by the minimal informational entropy of frequencies distribution of seed ger
Braz. J. Bot.. Publicado em: 2012
-
6. Thermal stability of the immobilized fructosyltransferase from Rhodotorula sp
The thermal stability of the extracellular fructosyltransferase (FTase) from Rhodotorula sp., recovered from cultivation medium by ethanol precipitation and immobilized onto niobium ore, was studied by Arrhenius plot, half - life profile, half - inactivation temperature (T50) and thermodynamic parameters. The Arrhenius plot showed two different behaviors wit
Brazilian Journal of Chemical Engineering. Publicado em: 2011-09
-
7. Influence of pH of colloidal suspension on the electrical conductivity of SnO2 thin films deposited via Sol-Gel-Dip-Coating
Tin dioxide (SnO2) thin films are deposited by the dip-coating technique from colloidal suspensions prepared with distinct pH through the sol-gel method. The decrease of the pH contributes to the destruction of an electrical layer adjacent to particles in solution, leading to a high degree of aggregation among these particles due to the generation of cross-l
Materials Research. Publicado em: 04/03/2011
-
8. Characterization of a novel lipase from Bacillus sp. isolated from tannery wastes
Kinetics of a lipase isolated from Bacillus sp. was studied. The enzyme showed maximum activity at pH 9 and temperature 60ºC. The Michaelis constant (K M 0.31 µM) obtained from three different plots i.e., Lineweaver-Burk, Hanes-Wolf and Hofstee, was found to be lower than already reported lipases that confirmed higher affinity of the enzyme for its substra
Brazilian Journal of Microbiology. Publicado em: 2011-03
-
9. PROPRIEDADES VIBRACIONAIS E DIELÉTRICAS DA MULITA Bi2Mn4O10 / VIBRATIONAL PROPERTIES AND DIELECTRIC OF MULITA Bi2Mn4O10
In this work we investigated the vibrational properties of ceramics Bi2Mn4O10 (BMO) at room temperature by the Raman and Infrared spectroscopies, the phonons were classified by FG matrix method of Wilson. The dielectric properties of the material, in turn, were studied using the impedance spectroscopy in a range of 22 C to 275 C. Furthermore, static atomisti
Publicado em: 2010
-
10. Determinação dos parâmetros de arrhenius da reação de sorção do dióxido de enxofre por calcário
Sulfur emission in coal power generation is a matter of great environmental concern and limestone sorbents are widely used for reducing such emissions. Thermogravimetry was applied to determine the effects of the type of limestone (calcite and dolomite), particle size (530 and 650 µm) and atmosphere (air and nitrogen) on the kinetics of SO2 sorption by lime
Química Nova. Publicado em: 2007-10
-
11. Transport and optical properties of resonant tunneling structures
Transport properties of a GaAs/AlAs superlattice-like double barrier diode are studied in this work as a function of the sample temperature. An activation energy of about 60meV obtained from the Arrhenius plot is in good agreement with the confined level in the central well. Numerical simulations also confirm the importance of bound levels in the gammaand X
Brazilian Journal of Physics. Publicado em: 2002-06
-
12. Gold recovery by galvanic stripping of an anionic organic extractant
The galvanic stripping technique for metal recovery uses commercial organic extractants containing a metal to be recovered. The organic phase is placed in contact with a solid metal reducer that allows electrochemical reactions to occur. One product of these reactions is a metal layer deposited on the surface of the reducer consisting of reduced species deso
Brazilian Journal of Chemical Engineering. Publicado em: 2001-06