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Two characters, scale-free and hierarchical structure, are shown in lots of real systems all over the world. In this article, firstly, we build up a class of network models with hierarchical structure, denoted by Nh(t), and prove it to be scale-free. By computing average degrees, we find these network models are all sparse. Secondly, based on their special topological structure, we research analytically...
Product design process is a complex system engineering. To improve the management efficiency of product design process, this paper, presents a new mode of product design process management from the perspective of modularization. Firstly, the related concepts and attributes of product design process module (DPM) are put forward. Then, the structure model of product design process based on DPM is established,...
With a copper removal experiment, this paper verified a new mathematical model of Emulsion Liquid Membrane (ELM) extracting hazard metal from waste water. The experimental data were put into the newly developed mathematical model of ELM. Mathematical model prediction of the copper concentration in aqueous phase were compared with the copper removal experimental data. The deviation of the model and...
This paper presents a detailed analytical solution for a mathematical model of Emulsion Liquid Membrane (ELM) extracting hazard metal from waste water. By solving the resulting simultaneous partial differential equations using the Laplace transform method, we obtain formulas for solute (hazard metal) concentration in external phase (waste water) versus time, solute concentration profile inside the...
In this paper, water distribution network model of typical central air conditioning system is established, all aspects of pipe network simulation carried out by various segments of the system pressure distribution and velocity distribution, such as analysis of the entire network of transportation and distribution characteristics. Through the analysis of pressure and pump power transformer and flow...
CODP (customer order decoupling point) is the boundary between make-to-stock (MTS) and make-to-order (MTO), and can determine the effectiveness of MC (Mass customization). This text build up a model for the CODP position base on profit, in this model, we establish the relationship between the position of CODP and the sales, then use M/M/N system of tandem queues to predigest the model. After that,...
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