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In this work, the magnetic behavior of 4H-GaN polytype codoped with (X = Na and Mg, Y = Na and Mg) is studied by means of first-principle calculations based on spin-density functional theory within the generalized-gradient approximation. It is found that the most stable configuration reveals the smallest cohesion energy and the X–Y bond length is minimal. (X, Y )-codoped 4H-GaN reveals magnetism behavior,...
This paper presents the results of tests carried out at the Algerian University of Science and Technology of Oran (USTO), on a solar photovoltaic water pumping system. This comprises a 1.5 kWp PV array directly coupled to a DC motor and a centrifugal pump. The system was tested for its performance over a period of four months and for two static head configurations. Although the motor-pump efficiency...
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