| Virtual chemical laboratory for students to grasp the chemical theory knowledge, improve the abilityof experiment operation provides a new interactive model of teaching. In view of the current marketsome of the chemical experiment platform of virtual experiment operation process representationmethod research is weak, lack of user effective diagnosis problem in the process of experiments, thispaper puts forward the corresponding solutions.In this paper, according to the characteristics of the virtual chemical Experiment operating Process,introduced and expanded the petri Net model, put forward the EOPDN (Experiment Operation ProcessDescription.net) virtual chemistry Experiment Operation Process Description method, and through thelimestone and hydrochloric acid from carbon dioxide Experiment example demonstrates build steps.Then, in using EOPDN said, on the basis of experiment operation process knowledge, process diagnosismethod is proposed, which contains three kinds of diagnostic methods, don’t points is: based on thedepth can be up to the tree again calendar calculation method and the reverse process of reasoningalgorithm diagnostic method, experiment operation degree method, experimental operation timediagnosis method, to diagnose the user in the experiments of leakage, need to process guidance,experiment resource usage errors, the time is not reasonable operation and so on.In the end, this paper will be based on EOPDN knowledge with XML markup language, and aprototype system for implementing the diagnosis method of this paper, the core code related totransplantation into the virtual chemical experiment platform, the platform with the diagnosis functionof the user process. Finally, the use of sodium carbonate in phenolphthalein reagent discolorationexperiment shows the operation of virtual experiment and test results, showed that the proposedoperation process knowledge representation methods and diagnosis method is effective. |
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