Advanced Materials Research Vols. 765-767

Abstract: In this paper, we study the Diophantine equation . By using the elementary method and algebaic number theroy , we proved that this equation has no integer soution.

Abstract: We studied the Diophantine equation . By using the elementary method and algebaic number theroy , we proved that this equation has no integer soution.

Abstract: The fractional Fourier transform (FRFT) of a new type of laser beams called the hypergeometric-Gaussian beam (HyGGB) is investigated in detail. The analytical expression for the FRFT of a HyGGB is derived. The properties of a HyGGB in the FRFT plane with different parameters are illustrated. The results show that the intensity distribution of a HyGGB in the FRFT plane strongly depends on the fractional order, the lens focal length and the initial beam width.

Abstract: The University Timetable Problems in Civil Engineering hinders the multi-targeting combinatorial optimization of teaching resources in colleges and universities. In this paper, it is studied how to adopt ant colony genetic algorithm to set up the course schedule system for civil engineering in colleges and universities, which makes the population form partitions according to rules in the genetic process, spray pheromones in the partitions, with the chromosome fitness and the population partitions crossing over with each other, to form a positive feedback system. As the experiment shows, through this method, the searching space can be reduced effectively, and the complexity of programs is simplified, so the time spent in generating optimal course schedules can be shortened.

Abstract: Straight pull single crystal furnaces temperature control system has problem of the long time lag and nonlinearity, so the precise mathematic mode that is hard to build. Advanced control strategies show strong advantages for resolving these problems. This paper use artificial neural network modeling approach to establish single crystal furnace temperatures neural network control BP structure model, use adaptive method to control the temperature of the single crystal furnace.

Abstract: Based on numerical simulations, the hydrodynamics and thermal water transport characteristics of the Calaca Power Plant, the Philippines were studied. Through analysis, after the extension of power plant capacity, the temperature difference between the intakes and 100m offshore to the outfall channel entrance is 2.2°C, which meets the local standard of the Philippines government regulation. Therefore, the extension of the power plant capacity would not affect the electricity generation efficiency.

Abstract: Using a numerical model based on the hydrodynamics and advection-diffusion equation, the water exchange capability of the Shuidong Bay was firstly simulated, then the water exchange rate of three regualation scenarios were calculated through the concentration variation of dissolved conservative tracer. The calculated results show that the water exchange rate of the Shuidong Bay is only about 65% after 30d under current condition.When bay was dredged to bottom elevation-3.0m, the water exchange rate can greatly increase to 88% after 30d. However, the water exchage rate has not significantly increased or even decreased after further dredging. Through comprehensive comparison, it is suggested to dredge the Shuidong Bay, and the dredging bottom elevation of-3.0m is the most suitable.

Abstract: Discharge is critical physical process in pulsed electromagnetic accelerators for arc plasma jet device, and its characteristics directly determines the accelerator performance. The mechanisms of discharge plasma and flow in the accelerator are analyzed by magnetohydrodynamics (MHD). The model is coupled with electric circuit model based on weakly nonideal plasma conductivity and ablation model. Calculation results show that there is some nonideal plasma region which has important effects on electrical conductivity; most ablated gases are ionized at the half cycle of the discharge time and are accelerated by Lorentz force to high exhaust velocity; electrical conductivity, plasma temperature and density are increasing with discharge energy unleashed, and gradually reduce in the post-discharge.

Abstract: To solve the problem of too many variable numbers which makes the model complex, a kind of auxiliary variables selection method is established. After that, soft sensing of lead-acid battery capacity is put forward. First, the RReliefF method is adopted to define quantitatively the influence of auxiliary variables. Then, the soft sensing model is built up with all the combination of auxiliary variables with BP neural network. Simulation results show that the soft sensing of battery capacity is established ideal. It provides theoretical feasibility to omit the battery discharge capacity in the process of production inspection process.

Abstract: it is the key point in simulation project design that how to delaminate and realize the war units and how to control them, this embodies the structure, the efficiency, the expandability of a system. This article explains a simulation design idea and realize procedure which sort the war units in an efficiency way, and a simulation control method called MAL.