3,346 research outputs found
Holographic superconductor in a deformed four-dimensional STU model
In this paper, we consider deformed STU model in four dimensions including
both electric and magnetic charges. Using AdS/CFT correspondence, we study
holographic superconductor and obtain transport properties like electrical and
thermal conductivities. We obtain transport properties in terms of the black
hole magnetic charge and interpret it as magnetic monopole of dual field
theory. We find that presence of magnetic charge is necessary to have maximum
conductivities, and existence of magnetic monopole with a critical charge (137
e) to reach the maximum superconductivity is important. Also, we show that
thermal conductivity increases with increasing of magnetic charge. It may be
concluded that the origin of superconductivity is magnetic monopole.Comment: 19 pages, 8 Figures. Accepted for publication in EPJ
Modeling batch annealing process using data mining techniques for cold rolled steel sheets
The annealing process is one of the important operations in production of cold rolled steel sheets, which significantly influences the final product quality of cold rolling mills. In this process, cold rolled coils are heated slowly to a desired temperature and then cooled. Modelling of annealing process (prediction of heating and cooling time and trend prediction of coil core temperature) is a very sophisticated and expensive work. Modelling of annealing process can be done by using of thermal models. In this paper, Modelling of steel annealing process is proposed by using data mining techniques. The main advantages of modelling with data mining techniques are: high speed in data processing, acceptable accuracy in obtained results and simplicity in using of this method. In this paper, after comparison of results of some data mining techniques, feed forward back propagation neural network is applied for annealing process modelling. A good correlation between results of this method and results of thermal models has been obtained
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