PPE study of water migration in starch sheets under moist atmosphere
The photopyroelectric method in a non contact detection configuration is proposed to study water migration in starch sheets. This allows the exchange of humidity between the moist atmosphere and the starch sample during the experiment. The sensitivity for the total water content measurement was about 0.3%. A theoretical model was developed, taking into account a continuous depth profile of humidity in the starch sample. A water profile in the material and its evolution in time were evidenced when exposing one side of the sample to a humid atmosphere.
1. ::: ::: In the course of the application of the enamel coating to 08sp steel, a diffusion redistribution of elements takes place accompanied by the formation in the metal surface layers of a diffusion zone which lost some manganese and gained silicon, boron, and titanium. ::: ::: ::: ::: ::: 2. ::: ::: The diffusion processes at the metal-enamel interface are accompanied by a change in the mechanical properties of surface layers of steel which can considerably affect its strength. ::: ::: ::: ::: ::: 3. ::: ::: The mechanical properties of surface layers of steel depend on the number of enamel firing cycles.