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For high‐altitude nozzle or micronozzle flows and other gas flows in the slip or transition flow regime, how to solve it reliably has always been a difficult problem. In this paper, a unified gas kinetic expression is presented to describe the two‐dimensional planar and the axisymmetric nozzle flows, and the computable modeling of the Boltzmann equation is developed at the first time for the nozzle...
Petri net is wildly used because of its features such as a formal and graphics language with strict mathematical definition as well as accurate syntax and semantics definition. This paper introduces the basic theory of Petri net briefly and discusses the approach of designing information system based on Petri net, as well as the architecture of the information system.
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