In this paper, the performance of a hot air turbine operating in an industrial combined heat and power (CHP) cogeneration is investigated, electrical and thermal energy supplied are intended for a pellet production unit. This unit is powered by Eucalyptus residue at 50% moisture content recovered from a forest located in El Taref, north-east of Algeria. The results show that when the air temperature at the boiler inlet Te exceeds 100 degree C, an excess air ratio, alpha, above 90% is required to maintain the flame temperature below 1200 K. Based on this, the parameters were set to alpha = 80% and Te = 100 degree C, resulting in a flame temperature of 1192K. The turbine inlet temperature T3, which must remain below the flame temperature, was fixed at 1140K. Once these conditions were established, the compression ratio maximizing the overall efficiency was determined to be around 8, yielding a cogeneration efficiency of 53%, with an electrical efficiency of 20% and a thermal efficiency of 33%.

This paper investigates the study and practical implementation of Finite Control Set Model Predictive Control (FCS-MPC) for a five-phase induction motor powered by a two-level, five-phase voltage source inverter. Multiphase systems present notable benefits over conventional three-phase configurations, including improved fault tolerance, enhanced torque production, and minimized harmonic distortion, making them well-suited for demanding applications. FCS-MPC operates by directly predicting and selecting the optimal control action at each sampling instant, eliminating the necessity of a modulation stage and offering fast dynamic response. The proposed control approach is designed and validated through experimental testing, assessing key performance indicators such as speed tracking, torque ripple, and current distortion under both transient and steady-state conditions. The experimental results demonstrate the effectiveness of FCS-MPC in ensuring precise and efficient control across various operating scenarios, making it a viable alternative for multiphase motor drive applications.

In this investigation, rolled plates of AZ31 Mg alloy were successfully friction-stir welded. It was found that the process leads to the microstructural refinement in the NZ due to the dynamic recrystallization with a global microstructural heterogeneity through the weld. The maximum microhardness values were attributed to the finest microstructure. The obtained results revealed that the cathodic behavior of the grain boundaries improves the corrosion resistance of the NZ. Thus, the corrosion resistance enhancement was ascribed to the most homogeneous microstructure and the finest grains.

This paper focuses on the characterization of nano-powder (NP) scintillator, specifically presenting preliminary results of the measurement of the light yield (LY) of a newly synthesized Lutetium Aluminum (LuAG) garnet phosphor NP scintillator, doped with 0.1% cerium. The scintillation light yield was measured using the comparative method. Considering the light-scattering and self-absorbing properties of powder scintillators, alpha particles from 241Am source were used for excitation instead of Gamma/X rays, while a Ce3+ activated LuAG single crystal (SC) was employed as the reference detector due to its well-established light yield. A photomultiplier tube (PMT) served as the photodetector, and signals were read out by a nuclear instrumentation chain. The results demonstrate that the newly prepared LuAG:Ce NP exhibits a light output that is approximately 90% of that of the single crystal reference. These findings highlight the promising potential of NP scintillators as a viable alternative to single crystals, especially in applications where the preference for powder scintillators is evident.

Methylene blue is not easily biodegradable, and its persistence in water can contribute to long-term contamination if not properly treated. Numerous adsorption kinetic study successes were achieved utilizing activated carbons of coconut shell, especially the Pseudo-First and Pseudo-Second order models with little/no regards to the unique behavior described by the Avrami, Bangham and the Fractional Power kinetic models. The parameters in those models are determined to describe the sorption mechanism. Avrami model fitting results suggests a complex adsorption process, which does not follow the first-order kinetic. Obtained results show that the Fractional Power model best described the Coconut Shell-Activated Carbon Methylene blue bio-sorption process at constant adsorption capacity of 15937.8 mg/g. Findings show that Bangham kinetic model does not fit the experimental data for Methylene blue sorption from aqueous solution. Methylene blue exposure issues like gastrointestinal discomfort, skin and eye irritation, and imbalances in the populations of various species in aquatic ecosystems due to impacts on their growth, reproduction and survival, may be solved using a very effective adsorbent, such as the Coconut Shell -Activated Carbon used here.

Polyaniline (PANI)-Fe2O3/CuO and PANI -Fe2O3/ZnO hybrid materials were developed and prepared by in situ polymerization at 0°C using ammonium persulfate as oxidant. The resulting products are investigated for their structural properties by X-ray diffraction (XRD), Fourier transform infrared (FTIR), and scanning electron microscopy (SEM), and the results confirm the formation of the hybrid architecture. In addition, the electrochemical properties of the hybrid products are investigated by cyclic voltammetry (CV) and optical properties were determined using UV-Vis Diffuse Reflectance Spectrophotometer (UV-Vis DRS). Compared to PANI/ZnO or CuO, Fe2O3/CuO or ZnO exhibit significantly improved properties. Based on the obtained results, the products thus open the way for a variety of electrical and sensors applications.

Recently, engineers and researchers have been concerned about how to improve the behavior of materials used in manufacturing. Ensuring the compatibility of particle, as main constituents with other reinforcement, in composites for specific behavior is essential. In this review, we attempt to list the salient features of experimental as well as numerical investigation on characteristics composite materials with adding either micro- or nano-particles, which is one of the ways to express it. The behavior of composites materials such as mechanical enhanced with different form, size, type and nature of particle additives. The bibliography review concludes that it would be important to investigate extensively the features of this technique in order to get more discoveries and developments of materials experimentally and numerically. Some contributions have identified the research gaps and deduced that the potential application of particles as additive agents in composites have not been more explored.

In this investigation, we report the synthesis of Goethite-NFs/CNTs nanocomposites using hydrothermal method at optimized growth condition. These nanostructured products have been characterized in order to identify their physico-chemical properties by different techniques, such as X-Ray Diffraction (XRD), Raman Spectroscopy, High Resolution Scanning Electron Microscopy (FESEM), Thermal analysis (TGA/DTA) and UV- Vis Spectroscopy. The obtained Goethite nanofibers (NFs) have shown structured triangular base nanofibers with diameter in the range [181 - 363 nm]. Using nested and twisted CNTs (MWNTs type) but fairly homogeneous in diameter around 48 nm, the formation of an assembly of two forms (MWNTs and iron oxide Nanofibers) in nanocomposite configuration confirms the significant improvement of their physico-chemical properties, like the increase in their electrical conductivity proven by their obtained gap energy Eg from 3.12 to 2.50 eV. Consequently, the reached results prove clearly that this kind of iron oxide-NFs/MWNTs based nanocomposites can be excellent candidate as electroactive nanomaterials for energy storage application.

This paper is a review on the stall delay phenomenon that Horizontal Axis Wind Turbines (HAWT) encounter under typical flow conditions and its numerical modelling. Aerodynamic performance predictions of HAWT have been often carried out through Computational Fluid Dynamics method with the combination of the concept of actuator disk i.e. hybrid method. For this purpose, the hybrid method is presented in details together with the numerical modelling of such stall delay phenomenon. Despite modern wind turbines are equipped with sophisticated control systems for avoiding stall, nevertheless, stall is still inevitable in the near root region of the rotor blade. This paper focuses on recent research development materials which have been undertaken on the stall delay phenomenon where the engineering models (stall delay models) of the literature being presented and criticized based on the predictions obtained from the NREL Phase VI wind turbine experiments.

This paper shows the different ways of using generalized Givens rotations in complex joint eigenvaluedecomposition (JEVD) problem. It presents the different schemes of generalized Givens rotation, justifies the introducedapproximations and focuses on the process of extending an algorithm developed for real JEVD to the complex JEVD.Several Joint Diagonalization problem use generalized Givens rotations to achieve the solution, many algorithmsdeveloped in the real case exist in the literature and are not generalized to the complex case. Hence, we show herein asimple and not trivial way to get the complex case from the real one. Simulation results are provided to highlight theeffectiveness and behaviour of the proposed techniques for different scenarios.