VY: title Vyazovkin

In takos: Analysis of Differential Calorimetry Scans

Description

performs analysis of the thermograms using Vyazovkin isoconversional method to calculate the activation energy (Ea)

Usage

VY(T, bet, Ea)

Arguments

T	temperature
bet	rate
Ea	estimated Ea to use as a first guess for the iterative process

References

VYAZOVKIN, S. Advanced isoconversional method. Journal of thermal analysis, 1997, 49.3: 1493-1499.

Examples

require(data.table)
require(MASS)
rates=c(0.5,1,2,5,10,20,50)
a<-lapply(rates, function(x) JMA(A=exp(35),Ea=120000,T0=0,T.end=300,q=x,npoints=5000,n=2))
a<-lapply(seq(1,length(a)), function(x) data.table(a[[x]]$time.s,a[[x]]$T.C,
a[[x]]$dadT, rates[[x]]))
lapply(seq(1,length(a)), function(x) setnames(a[[x]],
c("time.seconds","temperature.s","heat.flow","rates") ) )
as<-select_degree(ar)
vy<-as[, optimize(function(x) VY(temperature.s.K,rate,x), lower=50,upper=250),by=rit]

takos documentation built on Jan. 13, 2021, 4:11 p.m.