caa a22 4500 463192834 CHVBK 20180406164914.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10973-006-7527-0 doi (NATIONALLICENCE)springer-10.1007/s10973-006-7527-0 Usingordinary differential equations system to solve isoconversional problems innon-isothermal kinetic analysis [Elektronische Daten] [J. Jansen, L. Machado] The mathematical evaluation of the activation energy, E, of non-isothermal degradation reactions is usually made using the Ozawa/Flynn-Wall isoconversion principle and involves the numerical resolution of a set of integrals without closed form solution, which are solved by polynomial approximation or by numeric integration. In the present work, the isoconversion principle, originally described and maintained until now as an algebraic problem, was written as a set of ordinary differential equations (ODEs). The individual ODEs obtained are integrated by numeric methods and are used to estimate the activation energy of simulated examples. A least square error (LSE) objective function using the introduced ODEs was written to deal with multiple heating rate CaCO3 thermal decomposition TG experiments. Springer-Verlag, 2006 activation energy calculation nationallicence non-isothermal methods nationallicence temperature integrals nationallicence Jansen J. Instituto de Pesquisas Energéticas e Nucleares, Centro de Tecnologia das Radiações, Av. Prof. Lineu Prestes 2242 Cidade Universitária, 05508-000, São Paulo, SP, Brazil aut Machado L. Instituto de Pesquisas Energéticas e Nucleares, Centro de Tecnologia das Radiações, Av. Prof. Lineu Prestes 2242 Cidade Universitária, 05508-000, São Paulo, SP, Brazil aut Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 87/3(2007-03-01), 913-918 1388-6150 87:3<913 2007 87 10973 https://doi.org/10.1007/s10973-006-7527-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-7527-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Jansen J. Instituto de Pesquisas Energéticas e Nucleares, Centro de Tecnologia das Radiações, Av. Prof. Lineu Prestes 2242 Cidade Universitária, 05508-000, São Paulo, SP, Brazil aut NATIONALLICENCE 700 1- Machado L. Instituto de Pesquisas Energéticas e Nucleares, Centro de Tecnologia das Radiações, Av. Prof. Lineu Prestes 2242 Cidade Universitária, 05508-000, São Paulo, SP, Brazil aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 87/3(2007-03-01), 913-918 1388-6150 87:3<913 2007 87 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer