The kinetics of benzene alkylation with isopropyl alcohol has been studied in the vapor phase
over the H form of Beta zeolite as the catalyst. On the basis of the product distribution pattern
obtained over this large-pore zeolite, a reaction mechanism has been proposed. From this reaction
network, a simple stoichiometric model has been derived and fitted to the kinetic data. The
deactivation kinetics has also been investigated in a selected low-temperature range. The
activation energies of all reactions in the network have been determined. The activation energy
for the deactivation reaction in the chosen temperature range is found to be lower than that for
the main reaction.
This paper presents a methodology for the ontology based semantic annotation of web pages with annotation weighting scheme that takes advantage of the different relevance of structured document fields. The retrieval model is based on the importance factors of the structural elements, which are used to re-rank the documents retrieval by the ontology based distance measure. The relevance concept similarity are combined with the annotation-weighting scheme to improve the relevance measures. The proposed method has been evaluated on USGS Science directory collection. Preliminary experiments results show that our method may generate relevant document in the top rank.
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