No abstract

No abstract

No abstract

This paper presents a planar inverted-F antenna (PIFA) for ultra-wide band (UWB) communication, which is printed on a dielectric substrate of FR4-epoxy with 4.4 relative permittivity (1r), 2 mm thickness. This antenna is designed to be used in a 2.9-10.7 GHz frequency band, and a very wide bandwidth is realized by the addition of a parasitic element and a J-shaped slot to the PIFA. The effects of varying the parameters of the antenna on the performance have been investigated.

No abstract

No abstract

No abstract

Controlling the random nature of renewable energy sources such as solar radiation at ground, allows electric grid operators to better integrate it. In this paper, an intelligent datadriven model based on artificial neural network with autoregressive input sequence is developed to forecast the global solar radiation (GSR) time series on a half hour resolution in the site of Agdal, Marrakesh, Morocco. The database that is used to create this model was divided into two subsets. The first subset is used for training the proposed model on the data measured during the year 2008 by adopting three efficient optimizers (levenbergmarquardt, resilient backpropagation, and scaled conjugate gradient). The second subset is used for testing the efficiency and the robustness of the developed model to generate accurate predictions during the next six years (from 2009 to 2014). The obtained results demonstrate the accuracy and the stability of the proposed data-driven model to perform prediction in case of GSR measurements intermittence or sensor damage.