WOLFRAM|DEMONSTRATIONS PROJECT

Log Survival Ratio as a Function of Time

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temperature profile parameters
initial temperature control
20.
target temperature
120.
maximum heating rate
0.5
maximum cooling rate
1.15
mid heating time
6.
mid cooling time
20.
cooling water temperature
15.
minimum product-water temperature difference
5.
Weibullian rate parameters
lethal temperature marker
102.45
lethality rate factor
0.309
Weibullian concavity parameter
0.35
This fourth of five Demonstrations depicts the microbial log survival ratio, LS, as a function of time (in minutes) for a chosen temperature history. This is done by setting eight temperature profile and three Weibullian heat resistance parameters. Notice the automatic scaling of the
y
axis; it is different in each example.