![]() ![]() The results show that the actual precipitation potential of Sr reduces by nearly 0.5 V because of the depolarization effects of Sr activity reduced by forming Mg-Sr alloy. The electrochemical process of Mg-Sr codeposition was studied in MgCl 2-SrCl 2-KCl melts containing different MgCl 2 concentrations at 700 ☌ by cyclic voltammetry, chronopotentiometry and chronoamperometry. The chemical compatibility and thermal stability of the yttria coating on HD graphite in molten LiCl–KCl salt medium have been established. X-ray photoelectron spectroscopy analysis was carried out for elemental analysis before and after chemical compatibility test of the coated samples in molten LiCl–KCl salt to identify the corrosive elements present on the yttria coatings. After annealing at 1373 K, no appreciable grain growth of yttria particles could be observed. The surface morphology of yttria coating on HD graphite examined by scanning electron microscope and atomic force microscopy revealed the agglomeration of oxide particles and formation of clusters. X-ray diffraction and Laser Raman patterns confirmed the presence of cubic phase of yttria in the coating. The microstructure and the corrosion behavior of the yttria coating deposited on HD graphite in molten LiCl–KCl salt were evaluated by several characterization techniques. Yttria deposited on HD graphite samples were exposed to molten LiCl–KCl salt at 873 K for 3 h to evaluate the corrosion behavior of the coating for the purpose of pyrochemical reprocessing applications. Yttria coatings were deposited on high density (HD) graphite substrate by pulsed laser deposition method and subsequently annealing in vacuum at 1373 K was carried out to evaluate the thermal stability of the coatings. As the inlet temperature decreases, the phase change region remarkably enlarges, and the filling time rises. Since a solid layer exists adjacent to the pipe wall in phase change region, the flow velocity and pressure loss remarkably increases along flow direction, and the phase change region will dominate the pressure loss. ![]() As the freezing phenomena appears during pumping process, the flow velocity will decrease to zero, while the pressure loss reaches the maximum pressure head, and the freezing time increases with inlet temperature. During pumping process with melting, the flow velocity will first decrease by solidification and then increase by melting effect, and the melting time decreases with inlet temperature. In general, cold receiver pipe during initial pumping process will be frozen for molten salt solidification as the inlet temperature is lower than critical temperature, or else it will be unobstructed with melting process at higher inlet temperature. The filling dynamics and phase change performances of molten salt in cold receiver pipe during initial pumping process are numerically analyzed with variable inlet velocity due to pump characteristic curve. Consequently, a rule-based control software may be implemented directly from the specification of the validated complete OPN model by following a number of transformation rules. ![]() A conflict analysis approach is then introduced to identify all the conflicting events involved in the complete OPN model, so that the most suitable control/decision strategy for resolving each conflict event may be suggested. part routing, resource capacity), since the basic OPN class library is reusable. For an analysed non-deadlock basic OPN model, the complete OPN model for a specific AMS may be effectively derived from it by only including those related system constraints (e.g. Based on the basic OPN model, we need to construct the Object Communication Net (OCNet) for each physical object, and then employ the theory of invariants to perform the deadlock analysis. Both the basic and the complete OPN models are introduced to represent the generic and specific dynamic behaviours of an AMS, respectively. This paper presents an Object-oriented Petri Net (OPN) approach to model and analyse the dynamic behaviours of an Automated Manufacturing System (AMS). ![]()
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