In the present work, the reduction kinetics of iron molybdate (Fe 2 MoO 4 ) by hydrogen gas was investigated by thermogravimetric analyses (TGA). Both isothermal and nonisothermal experiments were conducted. By using fine particles, very shallow powder bed, and high hydrogen flow rate, the study could be focused on the chemical reaction. The activation energy obtained from the isothermal experiments was found to be 173.5 kJ/mol, which was in reasonable agreement with the value of 158.3 kJ/mol obtained from the nonisothermal experiments. The reduction product was found to be an intermetallic compound, Fe 2 Mo, of microcrystalline structure.
The kinetics of the decomposition of SrCO 3 in argon to SrO and CO 2 were studied in the temperature range 1000 to 1350 K. The thermal decomposition was followed simultaneously by thermogravimetric analysis (TGA) and differential thermal analysis (DTA) during linear heating. By using a nonisothermal method, the complete rate expression was determined from a relatively small number of experimental runs. Shallow beds of fine synthetic powder as well as thin flakes of pressed powder were employed to obtain the kinetics of decomposition in the absence of heat-and mass-transfer effects. The thermal decomposition started at about 1000 K. The recommended rate expression for the SrCO 3 decomposition iswhere ␣ is the ratio between the actual weight change and the theoretical final weight change, d␣ /dt is the time derivative of ␣, B is a rate constant in s Ϫ1 , E is the activation energy in J⅐mol Ϫ1 , R is the gas constant in J⅐K Ϫ1 ⅐mol Ϫ1 , T is the temperature in kelvin, and n is a factor depending on the geometry of the particles. The activation energy, E, for the decomposition of SrCO 3 was evaluated to be 210 kJ/mol. Curves of calculated ␣ vs temperature agree well with the experimental results.
Abstract-This paper deals with physical modelling and control of dynamic foaming in the LD-converter process. An experimental setup consisting of a water model, DSP and P C hardware is built up and showed to be useful for studying dynamic foaming. Furthermore, a foam height estimation algorithm is presented and validated through experiments. Finally, sound signals from the LD-converter and water model are compared and similarities between them are found.
Correlation between site preference and magnetic characteristics of self assembled strontium ferrite dot array on functionalized multi-walled carbon nanotubes
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