Browsing by Author "Farid Lekmine"

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    Design and Conception of Platform that Allows to Connect Different Solar Panels and Loads through a DC-DC Buck Converter
    (JOURNAL OF NANO- AND ELECTRONIC PHYSICS, 2022-12-27) Abdelkader Saidi; Boubekeur Azoui; Chaouki Ghenai; Farid Lekmine
    A step-down converter-based solar system was designed to reduce and stabilize voltage through adjustable PWM control. To power different loads, we applied a constant voltage to charge the battery throughout the charging time and with good efficiency, even if the solar panel was subjected to shadows or other disturbances. We created a platform to connect photovoltaic (PV) modules to the loads via a DC-DC buck converter with a voltage of up to 38 V and a maximum current of 5 A with a power of 75 W, as well as the voltage at the output up to 36 V. Our results are that we can use three solar panels and attach them to the platform, then place the battery as a load, fix the value of PWM on the converter, and make various measurements on a normal day and a disturbance day. We created an embedded system based on the Arduino ATmega328p microcontroller and sensors to measure different parameters such as voltage, current, power, temperature and monitor the voltage value on the load. Also, an algorithm was implemented in the processor to measure different instantaneous parameters, including the panel values (Vpv, Ipv, Ppv), as well as the buck parameters (Vo, Io, Po) using current sensors and tension. This work makes it possible to monitor various instantaneous electrical quantities at the panel and load levels and to acquire real-time data for various parameters, also connect the platform to a computer via a serial port to send data and save it using a microcontroller, and then read the data into a PLX-DAQ spreadsheet.
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    Effect of the Additive on the Properties of Ni-Fe Coating
    (2022-04-29) Farid Lekmine
    Electrodeposited Ni-Fe coating is employed in many fields such as corrosion, wear, magnetic and electrical applications, and electrocatalytic materials. To improve the properties of Ni-Fe coating, a wide variety of properties for coatings can be achieved by selecting different electrodeposition parameters. In this work, Ni-Fe coatings are deposited on copper substrates. X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and microhardness analysis are used to study the effects of boric acid on the morphology, phase structure, nickel content and microhardness of the coatings. The results confirm that the XRD patterns of the alloy deposits reveal that there are a number of sharp peaks in the images, indicating good crystallinity. The morphology of electrodeposited Ni-Fe coatings shows that the grains are spherical in nature for all samples, and EDS analysis of Ni-Fe composite confirms that the reduction of Ni decreases with increasing boric acid concentration. Moreover, reducing the concentration of boric acid in the Ni-Fe coating bath can lead to improved properties.
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    Effect of the Additive on the Properties of Ni-Fe Coating
    (JOURNAL OF NANO- AND ELECTRONIC PHYSICS, 2022-04-29) Ibtissem Zidani; Farid Lekmine; Darradji Bahloul; Abderrahmane Gana
    Electrodeposited Ni-Fe coating is employed in many fields such as corrosion, wear, magnetic and electrical applications, and electrocatalytic materials. To improve the properties of Ni-Fe coating, a wide variety of properties for coatings can be achieved by selecting different electrodeposition parameters. In this work, Ni-Fe coatings are deposited on copper substrates. X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and microhardness analysis are used to study the effects of boric acid on the morphology, phase structure, nickel content and microhardness of the coatings. The results confirm that the XRD patterns of the alloy deposits reveal that there are a number of sharp peaks in the images, indicating good crystallinity. The morphology of electrodeposited Ni-Fe coatings shows that the grains are spherical in nature for all samples, and EDS analysis of Ni-Fe composite confirms that the reduction of Ni decreases with increasing boric acid concentration. Moreover, reducing the concentration of boric acid in the Ni-Fe coating bath can lead to improved properties.
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