Multiobjective optimization of microalgae (Chlorella sp.) growth in a photobioreactor using Box-Behnken design approach

Authors: Hossain S.M.Z., Alnoaimi A., Razzak S.A., Ezuber H., Al-Bastaki N., Safdar M., Alkaabi S., Hossain M.M.
A parameter optimization approach to maximize the specific growth rate of the Chlorella vulgaris microalgae species, its biomass productivity, and CO2 capture rate was investigated. The Box-Behnken experimental design technique was applied with temperature, nitrogen to phosphorus ratio, and light-dark cycle per day, as the growth controlling parameters. For each [...]

A detailed statistical study of heterogeneous, homogeneous and nucleation models for dissolution of waste concrete sample for mineral carbonation

Authors: Irfan M.F., Usman M.R., Rashid A.
One of the key issues associated to mineral carbonation is the slow kinetic rate of leaching process. Hence it is highly important to study the kinetics of the leaching process in detail. This paper deals with the detailed analytical and statistical studies of calcium leaching from waste concrete sample. For [...]

Fuzzy control strategy for damping sub-synchronous resonance

Authors: Qader M.R.
Sub-Synchronous Resonance (SSR) is a phenomenon that harms turbine generator shafts because the phenomenon induces sub-synchronous wavering in the system. In the study presented in this paper, a dynamic resistance bank is used to mitigate the occurrence of sub-synchronous phenomenon. A fuzzy logic controller using rotor speed deviation and its [...]

Photophysical performance of radio frequency sputtered Pt/n-PSi/ZnO NCs/Pt photovoltaic photodetectors

Authors: Thahe A.A., Bakhtiar H., Ali B.A., Hassan Z., Bidin N., Bououdina M., Qaeed M.A., Talib Z.A., Al-Azawi M.A., Alqaraghuli H., Uday M.B., Ramizy A., Al-Ghamdi M.S., Abubakar D., Allam N.K.
The effect of the annealing temperature on the photoelectrical properties of the nanoporous silicon/zinc oxide nanocrystallites-based (Pt/n-PSi/ZnO NCs/Pt) photodetector was investigated. Different morphologies of 3D ZnO were synthesized onto the n-PSi substrates via radio frequency (RF) sputtering in the absence of a catalyst. The synthesis of ZnO NCs was controlled [...]

Application of artificial neural networks for exploratory analysis of small dataset

Authors: Gazder U., Ahmed A., Shahid U.
This study aims to explore the use of Artificial Neural Networks (ANNs) for estimating the relationship between accidents and other variables with a small dataset. ANNs have not been used to explore relationships between variables, especially for road accidents which have small datasets. Analysis of road traffic accidents is often [...]

Single axis automatic tracking system based on PILOT scheme to control the solar panel to optimize solar energy extraction

Authors: Ghassoul M.
Two types of solar panels are currently in use. Fixed panels; where they are placed at a convenient angle depending on the geographical location with a fixed tilt angle. But irradiation time merely exceeds six hours/day. The second type is rotating panels, either by continuously tracking the sun or through [...]

A proposal for server-less cloud-based infrastructure for a smart metering system in the Kingdom of Bahrain

Authors: Al-Naser A., El-Medany W.M.
Replacing the normal electricity and water meters with smart ones is one of the major transformations toward smart cities in the Kingdom of Bahrain. This transformation eliminates the need for manual reading and the estimated monthly billing values. The current approach of the system infrastructure is having the smart meters [...]

Linear and non linear optical properties of Sb2Se3 thin films elaborated from nano-crystalline mechanically alloyed powder

Authors: Hamrouni R., Segmane N.E.H., Abdelkader D., Amara A., Drici A., Bououdina M., Akkari F.C., Khemiri N., Bechiri L., Kanzari M., Bernède J.C.
Sb2Se3 powder is achieved by mechanical milling of Sb and Se elements. X-ray diffraction analysis indicated the formation of Sb2Se3 orthorhombic phase. The latter finding is confirmed by both X-ray photoelectron spectroscopy characterization and Raman spectroscopy. Magnetic measurement revealed the ferromagnetic character of Sb2Se3 powder. Thin films were obtained by [...]

Comparative study of structural, optical and magnetic properties of Fe–Pt, Fe–Cu and Fe–Pd-codoped WO 3 nanocrystalline ceramics: effect of annealing in hydrogen atmosphere

Authors: Dakhel A.A.
Abstract: Tungsten oxide (W-oxide) nanoparticles doped and codoped with different transition-metal (TM) ions (Fe, Pt, Cu and Pd) were synthesized by hydrochloric acid-assisted precipitation. The synthesized powders were characterized by X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS) and magnetic characterization methods. The room temperature (RT) monoclinic (P21/n) structure founded for [...]

An improved grid tied photovoltaic system based on current conditioning

Authors: Taleb M., Mansour N., Zehar K.
An interconnection of a renewable energy source: photovoltaic generator (PVG) with the power grid is investigated. The interconnection uses the conventional power inverter to link the DC PVG with the AC power grid sides. What is new in the interconnection is that an improved control strategy/technique is proposed to control [...]
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