Estimation of solar radiation of clear sky using non- linear methods case study: Fuerteventura (Spain)
The knowledge of irradiation in a geographical area is very important for multiple areas for the development of the area. Current calculation systems are based on statistical models of measurements of ground stations, or by external radiation calculations by satellite models. In this paper we show another method of calculation, [...]
Al-doped ZnO thin films grown onto ITO substrates as photoanode in dye sensitized solar cell
The photovoltaic performance of dye sensitized solar cells using Al-doped ZnO thin films (ZnO:Al) grown onto ITO substrates as photoanode and natural dye as sensitizer had been studied. The effects of [Al/Zn] ratio on structural, microstructural, optical and electrical properties of these films were investigated. X-ray diffraction analysis of pure [...]
Low energy, low-tech building design for the extreme cold of antarctica
The purpose of this research was to propose and build a sustainable, low-impact, optimized, modular lodge, to facilitate scientific studies in the Antarctic. Within this unique climate, this paper presents new environmental and sustainable approach for the extreme cold. The Polar Lodge was designed and built with a primary concern [...]
Detecting replay attacks in power systems: A data-driven approach
Detecting replay attacks in power systems is quite challenging, since the attackers can mimic normal power states and do not make direct damages to the system. Existing works are mostly model-based, which may either suffer from a low detection performance or induce negative side effects to power control. In this [...]
Optical, structural and photocatalysis properties of Cu-doped TiO 2 thin films
Pure and Cu +2 doped TiO 2 thin films have been successfully deposited onto glass substrate by sol–gel dip-coating. The films were annealed at 450 °C for 1 h and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM-EDX), atomic force microscopy (AFM), UV–vis spectrophotometer and photocatalytic degradation of methylene [...]
A grid-connected hybrid wind-solar power system
A hybrid renewable energy system consisting of a photovoltaic generator and a wind driven DC machine is interconnected with the power utilities grid. The interconnection is done through the use of two separate single phase full wave controlled bridge converters. The bridge converters are operated in the “inverter mode of [...]
Studies on Opuntia dilenii haw mediated multifunctional ZnFe2O4 nanoparticles: Optical, magnetic and catalytic applications
The sustainable and eco friendly green synthesis report on the use of plant extract alternate to chemicals has been discussed. In this work, opuntia plant extract is used as a natural reagent to synthesize nanoparticles. Herein, we demonstrate two methods namely, conventional and microwave method for the synthesis of nanoparticles [...]
Magnetic and Structural Properties of the Nanostructured Cu50Ni50 Powders
Nanocrystalline Cu50Ni50 alloy powder was prepared by the mechanical alloying process in high-energy planetary ball mill P7 under an argon atmosphere. Structural, microstructural, morphological, and magnetic properties were followed by X-ray diffraction, scanning electron microscopy coupled with EDX analysis, and vibrating sample magnetometry. The mixing of Cu and Ni powders [...]
A hybrid approach based on genetic algorithm and particle swarm optimization to improve neural network classification
Artificial Neural Network (ANN) has played a significant role in many areas because of its ability to solve many complex problems that mathematical methods failed to solve. However, it has some shortcomings that lead it to stop working in some cases or decrease the result accuracy. In this research the [...]
Nano-Crystalline Thermally Evaporated Bi2Se3 Thin Films Synthesized from Mechanically Milled Powder
Bi2Se3 powder has been successfully synthesized via mechanical ball milling of bismuth and selenium as starting materials. X-ray diffraction characterization revealed the formation of the rhombohedral and orthorhombic phases of Bi2Se3 material belonging to systems with space groups R 3 ¯ m and Pbnm, respectively. The advantageous last finding is [...]