This paper presents a modeling method of hierarchycolored and timed Petri net (HCTPN) that has an agent place. A workflow model for the die and mould MRP II system is established and the validity of workflow model is analyzed via the HCTPN. Combined with the control logics, the HCTPN-based model can accurately express the MRP II running process, so it is also the base of emulation and operation of the MRP II.
This study was aimed at investigating structural characterization, acute toxicity and protective effect of selenylated apple pectin on dextran sulfate sodium (DSS)-induced ulcerative colitis (UC) in mice. Selenylated apple pectin...
Based on the theory of PLC, a new method of form design is draw up to be “PLC analysis - Progress choose - Morphological characteristics –Product form design”, by considering the multiple relevant processes in all stages of PLC, to achieve the full unity of the form and processes, which varied from the traditional thinking mode of product design concentrating on product manufacturing process only. Then the design of motor oil container was done with the implement of new method.
Abstract. This paper mainly analyzed the environmental consciousness of middle school students in green schools and non-green schools in Lushui city by questionnaire survey. The result was shown that the environmental consciousness of middle school students in Lushui city was good, but the green school students' environmental awareness was generally higher than that of non-green school students. In the face of a variety of environmental problems in life, most students can't solve from their own reality, there was a gap between the knowledge and the action. Then this paper puts forward some suggestions such as non-green schools should strengthen environmental education and increase the environmental education curriculum, students themselves should read more environmental awareness material. In the teaching process, we must attach importance to the necessity of environmental education, make teaching link with real life, so that students can improve environmental awareness in real life situation.
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