Journal of Applied Engineering Science and Technology
type: channel
description: The Journal of Applied Engineering Sciences & Technology, JAEST, (ISSN 2352-9873) is a peer-reviewed biannual journal published in both electronic and print versions by the Faculty of Sciences and Technology, University of Biskra, Algeria. The Journal of Applied Engineering Sciences Technology is an open-access journal. The journal doesn’t have any article processing charges (APCs) or submission charges. The journal is now indexed in Google Scholar, Indexa, and Crossref. The journal invites submissions in English that present novel findings not previously published in journals within the domains of engineering science research. Additionally, JAEST also curates special issues featuring outstanding papers chosen from diverse conferences in specific areas of applied engineering science and technology. Print ISSN: 2352-9873 Online ISSN: 2571-9815
publisher: University of biskra
language: en
publication name: Journal of Applied Engineering Science and Technology
issn: 2352-9873
copyright: This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge. All articles are published under the Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited. License URL: https://creativecommons.org/licenses/by/4.0/
items: Solvent Extraction of Hydrocarbons from Petroleum Sludge: Experimental Optimisation Using Response Surface Methodology and Artificial Neural Networks
items: IoT-based smart street lighting system for reducing energy consumption
items: Experimental and Simulation Study of Copper (II) Adsorption on Activated Carbon Using Date nuts
items: Shear Deformations of FGM Beams with Mixed Restraints under Bending Using HSD Theory
items: Evaluation of Radon-222 concentration and its associated risks in groundwater sources of communities around selected mining sites in Sierra Leone
items: Performance Analysis and Optimization of BaHfS₃-Based Solar Cells Using SCAPS-1D Simulation Software
items: Experimental implementation of an SRM control approach
items: Design and Deployment of a Low-Cost IoT-Based Air Quality Monitoring System Using ESP32, BME688, and MQ135 Sensors in Urban Lagos, Nigeria
items: Study of the Hydrodynamic performance Membranes based on the Polysulfone and doped Polyanilibe : Conception and application
items: Analytical solutions of 1D population balance equation at steady-state
items: Organoclay As a Potential Eco-friendly Substitute Of Chalk In The Manufacturing Of The PVC Based Electric Cable
items: Drying of beetroots (Beta vulgaris L.) using oven dryer
items: A parametric analysis of the earth air heat exchangers' thermal efficiency and their effect on surrounding soil over time
items: CFD Analysis of Hybrid Photovoltaic Thermal (PV/Th) Solar Collector Efficiency Incorporating Ag-AL2O3/water Hybrid Nanofluids
items: Integrating AI into Key Enabling Technologies for 6G Networks: A Review from SDN to Quantum Computing
items: Corrosion inhibition effect of arabic gum on Cu-WC nanocomposite coating synthesized by electrodeposition technology
items: Analysis of legibility in urban public spaces. Case of El-Alia North-East neighborhood in Biskra, Algeria
items: Improving thermal comfort conditions through the optimization of the self-product residential buildings envelope. Case of a region with a hot and arid climate: Biskra
items: Numerical study of the active earth pressure distribution on cylindrical shafts using 2D finite difference code
items: Evaluation of the thermal environment in architecture hotel of Fernand Pouillon. Case of the Ziban Hotel in Biskra
items: Effect of the eccentric load on the bearing capacity of a strip footing founded on sand
items: Thermal performance of the horizontal opening in the traditional houses of old Biskra. Case of traditional house at Bab Edarb
items: Valorization of Vase Dam by the addition of the cement kiln Dust (CKD
items: Numerical study of the bearing capacity of a strip footing on tow layered clay under inclined loading
items: Numerical modeling of the prestressing losses in prestressed concrete beams by modal analysis method
items: Study and optimization of the windows’ impact on thermal comfort and energy efficiency (Case of offices in a hot and arid climate)
items: Effects of active mineral additions on the concrete behavior based on demolition sands
items: A new frequency analysis for diagnosis of bearing defects in induction motors using the adaptive lifting scheme of wavelet transforms
items: Effect of urban morphology on thermal comfort in outdoor spaces: the case of the red village-El Kantara-Biskra
items: Vision Based Tracking and Interception of Moving Target by Mobile Robot Using Fuzzy Control

Solvent Extraction of Hydrocarbons from Petroleum Sludge: Experimental Optimisation Using Response Surface Methodology and Artificial Neural Networks
type: item
description: The sustainable management of petroleum sludge from refinery storage tanks has become a growing environmental concern. These semi-solid wastes, rich in hydrocarbons, present significant challenges due to their toxicity, persistence in natural ecosystems, and the absence of dedicated treatment pathways. Nevertheless, their high content of heavy hydrocarbons also offers considerable potential for energy recovery, which remains largely underexploited in the national context. This study aims to assess the efficiency of solvent extraction for hydrocarbon recovery from petroleum sludge, with a particular focus on n-hexane as the extracting solvent. Owing to its non-polar nature and strong affinity for light to intermediate petroleum fractions, n-hexane enables selective extraction at relatively low energy cost. A rigorous experimental methodology was applied, combining Design of Experiments (DOE), Response Surface Methodology (RSM), and Artificial Neural Network (ANN) to model the extraction yield as a function of temperature, agitation time, and solvent volume. The models were then coupled with a genetic algorithm to determine the optimal operating conditions. The ANN model outperformed RSM in terms of prediction accuracy (R2 = 0.9917 vs. 0.9891, RMSE = 0.71 % vs. 0.81 %). The genetic algorithm coupled with ANN predicted a maximum recovery yield of 65.8 % at a sludge-to-solvent mass ratio of 0.166, in good agreement with the experimental maximum of 65.0 % (ratio 0.172) and with literature data. These results confirm the potential of solvent extraction as a promising pathway for the valorisation of petroleum sludge in Algeria and demonstrate the effectiveness of ANN-based modelling for process optimisation. Highlights First study in Algeria combining solvent extraction with RSM and ANN for petroleum sludge valorisation. ANN outperformed RSM in predicting extraction yield (R2 = 0.9917; RMSE = 0.71%). ANN-GA predicted 65.8% recovery, matching the experimental yield of 65.0%…
subject: Research Paper
  topic: section
subject: Petroleum sludge
  topic: keywords
subject: Energy recovery
  topic: keywords
subject: Sustainable management
  topic: keywords
subject: Solvent extraction
  topic: keywords
subject: Optimisation
  topic: keywords
subject: Artificial neural network
  topic: keywords
creator: Raiane Hasseine
creator: Abdelmalek hasseine
creator: Toufik Chaabane
creator: Merzougui Abdelkrim
creator: Djemoui Laiadi
rights: Copyright (c) 2026 Journal of Applied Engineering Science and Technology https://creativecommons.org/licenses/by/4.0
date: 2026-07-11
publication date: 2026-07-11
doi: 10.69717/jaest.v6.i2.177

IoT-based smart street lighting system for reducing energy consumption
type: item
description: Street lighting systems are essential components of urban infrastructure due to their critical role in ensuring citizens’ safety, comfort, and quality of life. Moreover, they are among the largest consumers of energy in urban environments. This paper investigates the performance and feasibility of a prototype smart street lighting system based on the Internet of Things (IoT) and wireless communication technologies. The system was implemented and tested at a pilot site to improve energy efficiency. It provides adaptive lighting by ensuring that the area in front of the user is illuminated more brightly than the area behind them. This functionality is achieved through data exchange between lampposts using the ESP-NOW protocol. A passive infrared (PIR) sensor is used to detect user movement. Power consumption data are collected and stored on the ThingSpeak cloud platform, while street images are captured using an ESP32-CAM module and saved to Google Drive. The results demonstrate the effectiveness of the proposed system in reducing energy consumption, achieving a reduction rate of 49.54 % over three days of experimentation. Consequently, the system contributes to lower carbon dioxide (CO2) emissions and generates positive impacts on both people and the environment. Highlights
subject: Research Paper
  topic: section
subject: Smart street lighting
  topic: keywords
subject: IoT
  topic: keywords
subject: ESP-NOW
  topic: keywords
subject: Energy consumption
  topic: keywords
creator: Mouaadh Yaichi
rights: Copyright (c) 2026 Journal of Applied Engineering Science and Technology https://creativecommons.org/licenses/by/4.0
date: 2026-07-11
publication date: 2026-07-11
doi: 10.69717/jaest.v6.i2.179

Experimental and Simulation Study of Copper (II) Adsorption on Activated Carbon Using Date nuts
type: item
description: This study evaluates the efficiency of Cu2+ ion removal using powdered activated carbon derived from date nuts in aqueous solutions. The maximum adsorption capacity reached 98.34 mg/g (Langmuir model) with a removal efficiency of 83.0 % at optimal conditions (initial concentration = 3 g/L, adsorbent dosage = 4 g/L, pH = 7.0, temperature = 25°C). Near-equilibrium was approached after 90 minutes, as adsorption became very slow after 60 minutes with only 3.6 % increase between 60 and 90 minutes. Kinetic analysis indicates that the pseudo-second-order model best describes the adsorption behavior with a correlation coefficient of R2 = 0.999. The computational model (Hassouna Algorithm) achieved a strong correlation coefficient of R2 = 0.999 and a very low mean squared error of MSE = 3.94 × 10-4, demonstrating high predictive accuracy. The Langmuir isotherm (R2 = 0.9964) provided a better fit than the Freundlich model (R2 = 0.9140), indicating monolayer adsorption on a homogeneous surface. The pseudo-second-order kinetic model (R2 = 1.0) suggests that chemisorption is the rate-limiting step. Overall, the findings confirm that biomass-derived activated carbon combined with computational modeling offers an effective and sustainable approach for copper removal in waste water treatment. Highlights Date-nut-derived activated carbon is an effective adsorbent for Cu2+. Adsorption is strongly affected by contact time and initial concentration. Langmuir isotherm and pseudo-second-order kinetic model best describe the process. MATLAB-based Hassouna Algorithm provides accurate adsorption simulation. Excellent agreement between experimental and modeled data (R2 ≈ 0.999).
subject: Research Paper
  topic: section
subject: Adsorption
  topic: keywords
subject: Copper (II)
  topic: keywords
subject: Date nut activated carbon
  topic: keywords
subject: Langmuir isotherm
  topic: keywords
subject: MATLAB simulation (Hassouna Algorithm)
  topic: keywords
subject: Numerical optimization
  topic: keywords
creator: Houda HASSOUNA
creator: Hanane Rehali
creator: Khaled Athmani
rights: Copyright (c) 2026 Journal of Applied Engineering Science and Technology https://creativecommons.org/licenses/by/4.0
date: 2026-07-11
publication date: 2026-07-11
doi: 10.69717/jaest.v6.i2.171

Shear Deformations of FGM Beams with Mixed Restraints under Bending Using HSD Theory
type: item
description: This paper presents a new proposed mathematical model for functionally graded material (FGM) beams with mixed restraints. Higher order shear deformation theory (HSDT) is used for FGM prismatic beams under bending taking into account the shear strains in the displacement field. A novel polynomial shear function is utilized for the shear stress which implies the nullity at the both top and bottom fibers faces of the cross-section, and its maximal value at the midline fiber. Material Characteristics are assumed to be varied continuously through the total thickness following a simple power-law, according to the volume fractions between constituents. The virtual work principle is employed for deriving the governing equations of the beam solved analytically using the integrals to obtain the displacement and the constitutive stress-strain relations with efficacy deterministic manner. It is noted that the material of FGM beam obeys Hooke’s law. The equilibrium equations and boundary conditions are considered in this study. Furthermore, the novel analytical model is explored using two illustrative examples. The obtained results predicted from the new proposed model for clamped-simply supported (C-S) beams under bending, are in good agreement with those obtained from the available literature. Highlights *]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]" dir="auto" data-turn-id="request-WEB:6cab6b42-53db-4ca0-8607-27342cbecad2-1" data-testid="conversation-turn-4" data-scroll-anchor="true" data-turn="assistant"> New HSDT model for FGM beams with mixed boundary conditions. Novel polynomial shear function ensures zero stress at beam surfaces. Analytical solutions derived using virtual work principle. Results show strong agreement with existing models (≤3‰ error). Model accurately predicts displacement and shear stress behavior.
subject: Research Paper
  topic: section
subject: FGM beams
  topic: keywords
subject: Mixed boundary conditions
  topic: keywords
subject: Bending
  topic: keywords
subject: HSD Theory
  topic: keywords
subject: Displacement
  topic: keywords
subject: Shear Stress
  topic: keywords
creator: Aissa Boussouar
creator: Ali Zaidi
creator: Hamza Dif
creator: Bachir Taallah
rights: Copyright (c) 2026 Journal of Applied Engineering Science and Technology https://creativecommons.org/licenses/by/4.0
date: 2026-04-09
publication date: 2026-04-09
doi: 10.69717/jaest.v6.i1.145

Evaluation of Radon-222 concentration and its associated risks in groundwater sources of communities around selected mining sites in Sierra Leone
type: item
description: Radon-222 in groundwater poses significant health risks through ingestion and inhalation, being the second leading cause of lung cancer deaths in the U.S., with 21,000 fatalities annually. This study evaluated radon-222 levels and associated risks in groundwater near mining sites in Sierra Leone during the rainy season. Fifteen samples from each site – Koidu, Yengema and Marampa, were analyzed using a calibrated DURRIDGE RAD-7 detector. Risks were calculated for infants, children and adults, including annual effective doses, Excess lifetime cancer risks and Lung Cancer Cases per million people per year. The results showed that Radon-222 concentrations in the groundwater samples ranged from 5.07 to 41.63 Bq/l with an average value of 19.10 Bq/l. The total annual effective doses varied from 65.53 to 590.49 (μSv/y), highest in infants. Excess lifetime cancer risks ranged from 0.0002 to 0.0021, with infants at the greatest risk. Lung cancer incidence was approximately 0.0009 per million people per year. Importantly, all samples remained below WHO and EU limits of 100 Bq/l, indicating compliance with international safety guidelines and no immediate health risk. However, 87.5% of samples exceeded USEPA's more stringent maximum contaminant level of 11.1 Bq/l. This discrepancy reflects differing regulatory philosophies : USEPA's precautionary approach versus WHO/EU's risk-based thresholds. While the water meets international standards for safe consumption, the exceedance of USEPA standards suggests potential long-term health concerns warranting continued monitoring, particularly for vulnerable populations such as infants and children. Simple, low-cost mitigation measures such as aeration, storage (allowing radon to decay/escape) and ventilation during water use are recommended where concentrations approach upper limits. Highlights 1. This study evaluated 222Rn levels and associated risks in groundwater near mining sites in Sierra Leone during the rainy season. 2. Fifteen sa…
subject: Research Paper
  topic: section
subject: Radon-222; Groundwater Contamination; Mining, Health Hazards, RAD7
  topic: keywords
creator: Mohamed Mustapha Abu
creator: Muteeu Abayomi OLOPADE
rights: Copyright (c) 2026 Journal of Applied Engineering Science and Technology https://creativecommons.org/licenses/by/4.0
date: 2026-04-09
publication date: 2026-04-09
doi: 10.69717/jaest.v6.i1.150

Performance Analysis and Optimization of BaHfS₃-Based Solar Cells Using SCAPS-1D Simulation Software
type: item
description: Although early theoretical studies and experimental studies indicate the potential of Barium Hafnium Sulfide (BaHfS3) as a photovoltaic absorber material, comprehensive device-level research under practical working conditions remains minimal. Chalcogenide BaHfS3 is a lead-free absorber layer material that has garnered attention because of its promising optical absorption and potential stability for solar energy technology. In this research, BaHfS3-based solar cell designs are investigated through Solar Cell Capacitance Simulator (SCAPS-1D) software numerical modeling. Optimization aspects of the device, such as absorber thickness, bandgap energy, defect density, operating temperature, parasitic resistances, buffer layer thickness, and charge transport material are considered. The base model (AZO/IGZO/BaHfS3/Sb2S3) recorded an η of 8.78 %, FF of 52.67 %, Jsc of 19.90 mA/cm2, and Voc of 0.837 V. The absorber thickness ranging from 300-400 nm presents a fair compromise between light absorption and carrier transport, Voc starts at 0.90 V and decreases to 0.84 V, Jsc rises from 23 mA/cm2 to 27 mA/cm2, FF declines from 75 % down to 30 % and recorded and efficiency of 16.1 %, while bandgap energy tuning showed a maximum η of 16.2 % at 1.5 eV. Lowering absorber defect density to Nt = 1 × 1010 cm-3 enhances device performance, where Voc = 0.86 V, Jsc = 27 mA/cm², FF = 83 % and η increased to 19 %. Thermal effects were modest, with η of 18.8 % at the temperature between 340 and 350 K. Under optimized parasitic resistances, series resistance (Rs) recorded η of 18.7 % as Rs varies from 1–10 Ω·cm2, whereas shunt related losses severely degraded η to 1.59 %. Increasing MoSe2 layer thickness improved the η from 18.7 % to 25.39 % at the thickness of 1000 nm. In the transport layers studies Ti2O3 is identify as the most effective ETM and CuS as the best HTM. The optimized TiO2/BaHfS3/CuS device achieved an efficiency of 19 % due to favorable Type-II band alignment and efficient char…
subject: Research Paper
  topic: section
subject: BaHfS3
  topic: keywords
subject: Solar cells
  topic: keywords
subject: SCAPS-1D
  topic: keywords
subject: Photovoltaic
  topic: keywords
subject: Absorber
  topic: keywords
creator: soko swaray
creator: Muteeu A. Olopade
rights: Copyright (c) 2026 Journal of Applied Engineering Science and Technology https://creativecommons.org/licenses/by/4.0
date: 2026-07-11
publication date: 2026-07-11
doi: 10.69717/jaest.v6.i2.148

Experimental implementation of an SRM control approach
type: item
description: This paper presents an improved current control strategy for a switched reluctance motor (SRM) drive. Owing to its doubly salient structure and nonlinear magnetic characteristics, the SRM exhibits strong coupling between current, flux, and torque, making accurate current regulation essential for achieving stable torque production and minimizing acoustic noise and ripple. The proposed controller is designed to enhance current tracking accuracy under fast dynamic conditions while preserving robustness against magnetic saturation, inverter delays, and load disturbances. Experimental validation is conducted on a fully instrumented SRM test bench using real-time acquisition hardware and a standard asymmetric bridge converter. The study demonstrates significant improvements in current tracking, torque quality, energy utilization, and global operational reliability when measured against earlier approaches in the literature. Highlights Significantly improved current-tracking performance with reduced dynamic error. Enhanced torque quality, including lower ripple and smoother torque production. Increased overall energy efficiency of the drive system. Improved operational reliability compared to conventional controllers reported in previous studies. The proposed solution outperforms existing methods in terms of accuracy, robustness, and overall performance.
subject: Research Paper
  topic: section
subject: Experimental Realization- Real-Time Implementation- Switched Reluctance Motor (SRM)- current control strategy
  topic: keywords
creator: Dhikra Arif
creator: Kassimi Youghourta
creator: Houssem Eddine Mimouni
creator: Abderrazak Guettaf
rights: Copyright (c) 2025 Journal of Applied Engineering Science and Technology https://creativecommons.org/licenses/by-nc/4.0
date: 2025-12-27
publication date: 2025-12-27
doi: 10.69717/jaest.v5.i2.144

Design and Deployment of a Low-Cost IoT-Based Air Quality Monitoring System Using ESP32, BME688, and MQ135 Sensors in Urban Lagos, Nigeria
type: item
description: This study presents the design, calibration, and in-field deployment of an IoT sensor network at a low cost for monitoring real-time urban air quality in Lagos, Nigeria, for diurnal and locational differences in Carbon-dioxide (CO₂), Nitrogen dioxide (NO₂), Methane (CH₄,) and weather parameters. The homemade system, constructed at ₦121,500, provides multi-gas and weather monitoring at 27–81% cheaper compared to mid- and high-end commercial sensors. Five hotspots with elevated risk—Oshosi, Iyana Ipaja, UNILAG dump site, Olusosun landfill, and Super Bus Stop—were assessed by morning (06:00–09:00) and evening (19:00–22:00) sessions. Nighttime levels of pollutants were always higher, with CO₂ highest at 790 ppm than the morning's 740 ppm, and CH₄ highest at 0.44 ppm ((Olusosun landfill). These increases were during times of elevated temperature (27.9-32.7 °C), humidity (68–79%) and lower atmospheric pressure (1003–1012 hPa), conditions that would have restricted vertical dispersion. High positive correlations (r ≥ 0.83, p < 0.05) existed between meteorological parameters (atmospheric pressure, relative humidity, and temperature) and the four detected pollutant concentrations (MQ135 index, NO₂, CO₂, and CH₄) during morning and nighttime sampling durations. The system maintained >95% uptime and gave data output within three seconds of data taking, and was therefore highly reliable and robust for tropical urban environments. This method offers an affordable, scalable model of continuous pollution monitoring and evidence-based urban environmental management for rapidly growing cities.
subject: Research Paper
  topic: section
subject: low-cost device
  topic: keywords
subject: air quality
  topic: keywords
subject: meteorology
  topic: keywords
subject: diurnal variation
  topic: keywords
subject: urban pollution
  topic: keywords
creator: Ibifubara Humphrey
creator: Adeyinka David Adewoyin
creator: Olamide Florence Humphrey
creator: Oluwasegun Timothy Fakorede
rights: Copyright (c) 2025 Journal of Applied Engineering Science and Technology https://creativecommons.org/licenses/by-nc/4.0
date: 2025-12-05
publication date: 2025-12-05
doi: 10.69717/jaest.v5.i2.139

Study of the Hydrodynamic performance Membranes based on the Polysulfone and doped Polyanilibe : Conception and application
type: item
description: Polysulfone/polyaniline ultrafiltration ((PSF/PANI-UF) membranes were prepared via the phase inversion method using six examples of the polyaniline (PANI) synthesized in the presence of doped by functionalized agent dopants by direct process. To enhance the hydrodynamic performances of these prepared membranes, the conducting polyaniline (PANIs) has been added at different mass compositions (0.0, 0.2, 0.5 and 1.0%). The performance surface hydrophobicity was estimated by the contact angle. The PSF/PANI Membranes were characterized by FTIR spectroscopy in order to identify the interaction between PSF, PEG and PANI in presence of NMP solvent. The UV-Visible results of the PANIs pellets indicate that PANIs were obtained as emerald salt, which confirmed by calculating the oxidation state of PANIs from the FTR spectra. The separation properties of the composite membranes were studied in terms of water permeability and methylene blue removal. The porosity and the permeability of the membranes PFS/PANI were improved in comparison with that of the pristine PSF membrane as well as rejection capacities (>97%) for methylene blue. In addition to this, the pure water flux of the membrane (PANI (B and D)) increased reaching up to 0.0444 and 0.05824-ml. min-1 respectively at a pressure of 3.0 bars. Highlights Composites based on different doped PANIs prepared using the reverse phase method. The percentages of the different formulations were carefully considered. Several techniques were proposed to confirm the presence of the dopant in the structure of PANI and polysulfone. The techniques were used to study the performance of the developed membranes. The results obtained confirmed the usefulness of the developed membranes in the field of wastewater purification, especially methylene blue.
subject: Research Paper
  topic: section
subject: Membrane
  topic: keywords
subject: Polysulfone
  topic: keywords
subject: Polyaniline
  topic: keywords
subject: Water treatment
  topic: keywords
creator: NACIRA NAAR
creator: Ahmed Brahim
creator: Khaled Beyaz
creator: Fatima Boukraa
rights: Copyright (c) 2025 Journal of Applied Engineering Science and Technology https://creativecommons.org/licenses/by-nc/4.0
date: 2025-12-27
publication date: 2025-12-27
doi: 10.69717/jaest.v5.i2.136

Analytical solutions of 1D population balance equation at steady-state
type: item
description: Due to their effectiveness in separation and purification, two-phase flow columns (liquid-liquid, gas-liquid, and solid-liquid) are extensively utilized in the chemical industries. PBE has recently been recognized as an appropriate tool for modeling this kind of column owing to its ability to describe both the hydrodynamics and the mass transfer of the dispersed phase. In this work, we solved analytically one-dimensional PBE at steady-state using the Adomian decomposition method and the Method of moments. Analytical solutions are provided for pure growth, pure breakup, breakup with growth, pure aggregation, and breakup with growth with aggregation. The obtained results encourage extending the applicability of both methods to solve 1D PBE. Highlights Analytical solutions of the one-dimensional steady-state Population Balance Equation (PBE) are presented. The Adomian Decomposition Method (ADM) is applied to solve cases involving breakup, aggregation, and growth. The Method of Moments (MOM) is used to handle combined growth, breakup, and aggregation processes. Both space-dependent and volume-dependent particle velocity models are considered. The results enhance understanding of dispersed phase behavior in two-phase flow columns and confirm the effectiveness of ADM and MOM.
subject: Research Paper
  topic: section
subject: population balance
  topic: keywords
subject: multiphase column
  topic: keywords
subject: Adomian decomposition method
  topic: keywords
subject: method of moments
  topic: keywords
creator: Khaled Athmani
creator: Abdelmalek Hasseine
creator: Djemoui Laiadi
rights: Copyright (c) 2025 Journal of Applied Engineering Science and Technology https://creativecommons.org/licenses/by-nc/4.0
date: 2025-12-27
publication date: 2025-12-27
doi: 10.69717/jaest.v5.i2.135

Organoclay As a Potential Eco-friendly Substitute Of Chalk In The Manufacturing Of The PVC Based Electric Cable
type: item
description: The aim of this work was to study the effects of an organoclay on the properties of a polyvinyl chloride polymer and to compare the obtained results to polyvinyl chloride/chalk counterpart in order to replace the no eco-friendly and no-economic chalk by the cheap and eco-friendly organoclay in the electric cable polyvinyl chloride manufacturing. The obtained nanocomposites were prepared by dry blending followed by extrusion. The x-ray diffraction analysis evidenced an intercalation of the polyvinyl chloride chains between organoclay platelets. The thermal stability (Beilstein test) of the nanocomposite was greatly improved and thermgravimetric analysis (TGA) showed that the formulation containing 1 wt % of organoclay is the more thermally stable up to 240 °C. Differential scanning analysis showed that the glass transition temperature of the nanocomposite is higher than the neat polyvinyl chloride. A rheological analysis revealed that the addition of organoclay had not damaged the processability of the nanocomposite. Scanning electronic microscopy analysis revealed a uniform dispersion of the organoclay particles in the polyvinyl chloride matrix. The PVC based organoclay exhibits properties better than PVC based chalk used in the industry. So, the eco-friendly organoclay can be a good alternative to the expensive and irritating chalk. Highlights 1% organoclay improves PVC strength, ductility, and thermal stability. XRD shows intercalation at 1% organoclay, enhancing composite structure. DSC confirms higher Tg for 1% organoclay due to chain confinement. Organoclay offers better processability and lower energy use than chalk. SEM reveals uniform dispersion only at low organoclay loading.
subject: Research Paper
  topic: section
subject: Organoclay
  topic: keywords
subject: Polyvinyl chloride
  topic: keywords
subject: Nanocomposite
  topic: keywords
subject: Mechanical properties
  topic: keywords
creator: Chaouki Bendjaouahdou
creator: Yacine Kouadria
creator: Mouloud Lahouimel
rights: Copyright (c) 2025 Journal of Applied Engineering Sciences & Technology https://creativecommons.org/licenses/by-nc/4.0
date: 2025-06-28
publication date: 2025-06-28
doi: 10.69717/jaest.v5.i1.120

Drying of beetroots (Beta vulgaris L.) using oven dryer
type: item
description: Removal of moisture from food is popularly called drying and it is one of the most vital preservation techniques used in the food industry. In this study, the beetroots (Beta vulgaris L.) were dried in a laboratory oven dryer. The samples of fresh beetroots were dehydrated under a temperature of 50°C. The experimental study selected three different forms of the product, we choose a square form with (5 × 5 cm) and thickness e = 5 mm, a semi-circle form with thickness e = 5 mm and diameter D = 5 mm, and a triangle form with (5 × 5 × 5 cm) and thickness e = 4 mm. The main objective of the present study is to find the selection of the drying techniques essential to producing high-quality dried products in a rational time. The results give the moisture ratio of the different forms of the beetroot product as a function of time drying, while the triangle form responded to the drying process faster than the other two forms. Highlights Beets dried at 50 °C in oven using 3 geometric shapes. Triangle shape dried fastest due to smaller thickness. Moisture ratio dropped to nearly zero after 325 min. Square shape retained more water and dried slower. Drying time linked more to thickness than shape.
subject: Research Paper
  topic: section
subject: Beetroots
  topic: keywords
subject: Beta vulgaris L
  topic: keywords
subject: Drying process
  topic: keywords
subject: Moisture ratio
  topic: keywords
subject: Oven dryer
  topic: keywords
subject: Forced convection
  topic: keywords
creator: Chaima Toumi
creator: Foued Chabane
creator: Amira Hecini
creator: Zouhair Aouissi
rights: Copyright (c) 2025 Journal of Applied Engineering Science & Technology https://creativecommons.org/licenses/by-nc/4.0
date: 2025-04-15
publication date: 2025-04-15
doi: 10.69717/jaest.v5.i1.112

A parametric analysis of the earth air heat exchangers' thermal efficiency and their effect on surrounding soil over time
type: item
description: Earth Air Heat Exchanger (EAHE) system is widely regarded as an efficient and sustainable solution, minimizing the consumption of energy and enhancing indoor thermal comfort. This study seeks to conduct a detailed analysis of the parameters that affect the performance of EAHE systems, including the surrounding soil, climatic conditions, and time variations. A semi analytical numerical model was used and verified with existing literature data. Key parameters such as air velocity, operational periods, and soil thermal conductivity were investigated for their effect on the performance of the EAHE and the surrounding soil. The findings revealed that the model provided predictions that strongly agreed with experimental results, with only a 2.3% error margin. The study found that EAHE performance is predominantly influenced by higher soil conductivity and lower airflow velocity. In contrast, the duration of operation had minimal effect on the outlet air temperature, which increased by just 1 °C over 48 h compared to the 1st h. Lastly, the cooling of the surrounding atmosphere was identified as a key factor in enhancing the exchanger's efficiency, as it helps cool the soil after extended operation, thus restoring its cooling ability. Highlights EAHE outlet temp rose only 1 °C after 48 h continuous operation. Higher soil conductivity enhances heat transfer and cooling. Increased air velocity reduces heat exchange and cooling effect. Soil heats up over time, reducing EAHE performance without rest. Model was validated with just 2.3% error vs. experimental data.
subject: Research Paper
  topic: section
subject: Soil surrounding
  topic: keywords
subject: EAHE
  topic: keywords
subject: Cooling
  topic: keywords
subject: Continuous operation
  topic: keywords
subject: Thermal performance
  topic: keywords
creator: Yousra Boutera
creator: Nora Boultif
creator: Noureddine Moummi
creator: Charafeddine Beldjani
creator: Mohamed Aymen Kethiri
creator: Saleh Momen SM
creator: Arıcı Müslüm
rights: Copyright (c) 2025 Journal of Applied Engineering Science & Technology https://creativecommons.org/licenses/by-nc/4.0
date: 2025-04-12
publication date: 2025-04-12
doi: 10.69717/jaest.v5.i1.111

CFD Analysis of Hybrid Photovoltaic Thermal (PV/Th) Solar Collector Efficiency Incorporating Ag-AL2O3/water Hybrid Nanofluids
type: item
description: The optimization of energy consumption is closely tied to enhancing the power output of photovoltaic panels. This study offers a numerical investigation of the utilization of hybrid nanofluids (Ag-Al2O3-water) as a cooling fluid in a hybrid photovoltaic thermal (PV/Th) collector, aiming to improve electrical performance by lowering the PV cells operating temperature. The hybrid PV/Th collector comprises a photovoltaic panel (PV) coupled with a thermal collector, including a heat sink equipped with rectangular ribs positioned at the bottom of the PV module. This research explores the impact of critical configuration parameters, such as inlet velocities of working fluid and nanoparticle volume fractions, on the Nu number, PV cell temperature, and both thermal and electrical efficiencies within steady-state operating conditions. The 3D numerical simulation to analyze the overall performance of a hybrid PV/Th collector was conducted using ANSYS Fluent software version 17.1. The numerical findings demonstrate that increasing the nanoparticle volume fraction elevates the cooling fluid's thermal conductivity, consequently enhancing the heat transfer by conduction. Furthermore, higher coolant velocities enhance heat transfer by convection, resulting in a more effective heat transfer rate within the PV/Th system. This, in turn, reduces the operating temperature and significantly enhances the hybrid PV/Th system's overall performance. Highlights Hybrid nanofluid cooling reduces PV cell temp and boosts overall system efficiency. Higher Re numbers and nanoparticle loads enhance thermal and electrical performance. ANSYS CFD showed max total efficiency of 44.7% at Re = 800, Φ = 0.06. Ag-Al2O3 nanofluid outperformed water alone in PV/Th heat transfer. PV cell temp dropped from 60.1°C to 40.6°C using nanofluid at high flow rate.
subject: Research Paper
  topic: section
subject: Renewable energy
  topic: keywords
subject: Solar energy
  topic: keywords
subject: Hybrid Photovoltaic-Thermal solar collectors
  topic: keywords
subject: PV panel
  topic: keywords
subject: Hybrid nanofluid
  topic: keywords
subject: CFD simulation
  topic: keywords
subject: Heat and mass transfer
  topic: keywords
creator: Charafeddine Beldjani
creator: Kamel Aoues
creator: Noureddine Belghar
creator: Yousra Boutera
creator: Mohamed Aymen Kethiri
rights: Copyright (c) 2025 Journal of Applied Engineering Science & Technology https://creativecommons.org/licenses/by-nc/4.0
date: 2025-04-10
publication date: 2025-04-10
doi: 10.69717/jaest.v5.i1.110

Integrating AI into Key Enabling Technologies for 6G Networks: A Review from SDN to Quantum Computing
type: item
description: This review article provides an in-depth analysis of integrating artificial intelligence (AI) into key enabling technologies for sixth-generation (6G) wireless networks. It examines how AI can enhance the performance and efficiency of technologies such as software-defined networking (SDN), network functions virtualization (NFV), network slicing, edge and cloud computing, and quantum communications. The study also covers other emerging technologies like reconfigurable intelligent surfaces, terahertz communications, holography, and neuromorphic computing. It identifies technical, security, and interoperability challenges related to this integration while exploring future perspectives and promising research directions. The article aims to provide a comprehensive understanding of the current state of AI integration in 6G technologies, thereby offering valuable guidance for researchers, engineers, and decision-makers in this rapidly evolving field. Highlights AI enhances SDN, NFV, and slicing for smarter 6G network control. AI boosts real-time edge/cloud decisions and resource use. Quantum and THz tech gain security and speed via AI tools. AI enables dynamic holography, RIS, and beamforming in 6G. Integration faces privacy, energy, and standardization challenges.
subject: Review paper
  topic: section
subject: 6G
  topic: keywords
subject: Artificial intelligence
  topic: keywords
subject: SDN
  topic: keywords
subject: NFV
  topic: keywords
subject: Network slicing
  topic: keywords
subject: Edge and cloud computing
  topic: keywords
subject: Quantum communications
  topic: keywords
creator: Mounira Hendaoui
rights: Copyright (c) 2025 Journal of Applied Engineering Science & Technology https://creativecommons.org/licenses/by-nc/4.0
date: 2025-04-01
publication date: 2025-04-01
doi: 10.69717/jaest.v5.i1.109

Corrosion inhibition effect of arabic gum on Cu-WC nanocomposite coating synthesized by electrodeposition technology
type: item
description: Nanostructured Cu-WC composite coatings were electrodeposited by co-deposition process onto pretreated steel substrate from an acidic sulfate electrolyte bath containing various amount of dispersed WC powder. The analysis by scanning electron microscopy shows those Cu-WC composite coatings containing cracks and random distribution of the oval-shaped WC particles. The X-ray diffraction (XRD) reveals that the structure of Cu-WC coatings is controlled by the WC powder amounts in the electrolyte baths. The average crystallite size was calculated by use X-ray diffraction analysis and its increasing is proportional to the enhancement of WC solid particles amount. The crystallite structure was fcc for electrodeposited Cu-WC nanocomposite coatings. The potentiodynamic polarization and electrochemical impedance spectroscopic studies reveal that grain refinement offers the best corrosion resistance. Arabic gum shows that it is an anodic inhibitor with high inhibitor efficiency reaches 70.95%. IR spectroscopy analysis shows several functional groups responsible for high inhibitor efficiency. Highlights Cu-WC coatings were electrodeposited with varying WC content onto steel substrates. SEM and XRD showed random WC distribution and fcc structure with increasing grain size. 10 g/L WC coating had the best corrosion resistance in 3.5% NaCl. Arabic gum improved corrosion resistance, acting as an effective anodic inhibitor. EIS confirmed max inhibitor efficiency of 70.95% at 25 g/L WC with Arabic gum.
subject: Research Paper
  topic: section
subject: Ni-WC composite coatings
  topic: keywords
subject: Grain size
  topic: keywords
subject: Corrosion resistance
  topic: keywords
subject: EIS
  topic: keywords
subject: Arabic gum
  topic: keywords
subject: Anodic inhibitor
  topic: keywords
creator: Ben Temam Hachemi
creator: Madjeda Zarour
creator: Oussama Bacha
creator: Elhachmi Guettaf Temam
creator: Amer Mekkaoui
rights: Copyright (c) 2025 Journal of Applied Engineering Science & Technology https://creativecommons.org/licenses/by-nc/4.0
date: 2025-04-07
publication date: 2025-04-07
doi: 10.69717/jaest.v5.i1.108

Analysis of legibility in urban public spaces. Case of El-Alia North-East neighborhood in Biskra, Algeria
type: item
description: The Algerian city faces serious problems related to various dysfunctions, a planned urban structure and a social structure suffering from various social ills. This has a noticeable effect on urban public spaces. The latter are the receptacle of a typology of behaviors, of ways of consuming space that seem to depend on the spatial conformation, the legibility, the identification and the orientation of the user. The present work seeks to explain the relation between legibility and dysfunction in the urban public space and to characterize the influence of space on the movement of pedestrians therefore on their behavior. The selected case study is urban public spaces in the spontaneous neighborhoods of El Alia North-east of the city of Biskra. As a model of analysis, we proposed the combination of two methods obtained from the literature, namely the method of the responsive environments and the method of space syntax. We confronted the results of the analysis of the space syntax and the results of the investigation by the technique of the direct observation "Gate counts". We have shown that the quality of urban public spaces in terms of legibility affects their functioning and their stability.
subject: Research Paper
  topic: section
subject: Dysfunction
  topic: keywords
subject: Legibility
  topic: keywords
subject: Identification
  topic: keywords
subject: Behavior
  topic: keywords
subject: Space Syntax
  topic: keywords
creator: Nadia Femmam
creator: Said Mazouz
rights: Copyright (c) 2018 https://creativecommons.org/licenses/by-nc/4.0
date: 2018-06-30
publication date: 2018-06-30
starting page: 9
ending page: 9
doi: 10.69717/jaest.v4.i2.92

Improving thermal comfort conditions through the optimization of the self-product residential buildings envelope. Case of a region with a hot and arid climate: Biskra
type: item
description: To improve the thermal comfort conditions of the occupants in the individual housingand to reduce the energy consumption induced by the heating and cooling needs in the building, itis necessary to act on the main element which controls the heat exchanges with the environment:the envelope. This refers to the building’s outer skin that consisting of vertical opaque components(the walls ...), horizontal ones (roof ...) and various opening devices. The thermal performance ofthe envelope is mainly due to its geometrical and formal attributes, but the material characteristicsof its components remain decisive for thermal exchanges with the environment. As part of thebuilding at the interface of the indoor ambiances and the outdoor environment, the envelope isoften the seat of a large number of heat exchange phenomena that affect not only the premisesenergy consumption but also the thermal comfort conditions of their occupants. This papersummarizes the main results obtained from an in-situ measurement campaign to evaluate thedesign parameters influencing the thermal comfort of self-produced individual housing relative tothe hot and arid climate of Biskra. In addition, a thermal simulation carried out with the TYRNSYS17 software has demonstrated the potential of improving the thermal comfort conditions of theself-produced individual housing thanks to adequate choices concerning the architectural andconstructive attributes of the envelope.
subject: Research Paper
  topic: section
subject: Architectural envelope
  topic: keywords
subject: Thermal comfort
  topic: keywords
subject: Materials
  topic: keywords
subject: Self-product Individual housing
  topic: keywords
subject: Hot and arid climate
  topic: keywords
subject: Biskra
  topic: keywords
creator: Sihem Latreche
creator: Leila Sriti
rights: Copyright (c) 2018
date: 2018-06-23
publication date: 2018-06-23
starting page: 9
ending page: 9
doi: 10.69717/jaest.v4.i2.91

Numerical study of the active earth pressure distribution on cylindrical shafts using 2D finite difference code
type: item
description: The present paper examine the distribution of the active pressure on a circular shaftembedded in granular material subjected to radial displacement. The deformation problem wassolved under axisymmetric conditions using explicit finite difference code FLAC (Fast LagrangianAnalyses of Continua). Based on the numerical results, the distribution of the active pressure withincreasing excavation depth is non-linear for all interface angle of the shaft, for different diametersand height of the shaft also for the all friction angles of the soil. When friction angle of the soil thatare less than, or equal to 10° the active pressure is linear. These results are summarized andcompared against previously published theoretical solutions and experimental results.
subject: Research Paper
  topic: section
subject: Vertical circular shaft
  topic: keywords
subject: Arching effect
  topic: keywords
subject: Axisymmetric earth pressure
  topic: keywords
subject: Numerical modeling
  topic: keywords
subject: Soil
  topic: keywords
subject: Interaction
  topic: keywords
creator: Abdelmadjid Meftah
creator: Naïma Benmebarek
creator: Sadok Benmebarek
rights: Copyright (c) 2018
date: 2018-06-11
publication date: 2018-06-11
starting page: 6
ending page: 6
doi: 10.69717/jaest.v4.i2.90

Evaluation of the thermal environment in architecture hotel of Fernand Pouillon. Case of the Ziban Hotel in Biskra
type: item
description: The main objective of this study is to evaluate the impact of the orientation on thethermal environment in the works of Fernand Pouillon and its role in the reduction of the strongcontinuous and daily variations of the temperatures. In the region of Biskra, Fernand Pouillon,seems to show his mastery of the parameters related to the external physical environment inorder to create suitable indoor thermal environments in a hot and arid climate. In this regard, weused the experimental method, through the ECOTECT digital simulation program, to study thequantitative aspects of these thermal environments. Thus, we have particularly studied theinfluence of the orientation with respect to the sun and the wind on the thermal environments ofour case study. Finally, a comparison between the temperatures, in the successive sequences,allowed us to demonstrate that the preferred choices in orientation by Fernand Pouillon areadequate or not.
subject: Research Paper
  topic: section
subject: Thermal atmosphere
  topic: keywords
subject: Simulation
  topic: keywords
subject: Orientation
  topic: keywords
subject: Sequence
  topic: keywords
subject: Hotel Ziban
  topic: keywords
creator: Sara Zineddine
creator: Azeddine Belakehal
creator: Amar Bennadji
rights: Copyright (c) 2018
date: 2018-06-22
publication date: 2018-06-22
starting page: 6
ending page: 6
doi: 10.69717/jaest.v4.i2.89

Effect of the eccentric load on the bearing capacity of a strip footing founded on sand
type: item
description: The finite differences FLAC 2D software which allows to model all soil-structureinteractions regardless of the difficulty of the problems is used to determine the bearing capacityand stress distribution under a rigid strip footing submitted to vertical centered and eccentricloads. The footing is set on a free surface of sand with no surcharge applied. The soil is assumed tobe elastic – perfectly plastic following the Mohr–Coulomb failure criterion. The results of thepresent study show that the conception proposed by Meyerhof tends to underestimate thebearing capacity, especially for large eccentricities. The study proposes an expression of theeffective width that gives reasonable bearing capacity values, even for large eccentricities.
subject: Research Paper
  topic: section
subject: Bearing Capacity
  topic: keywords
subject: Eccentric Load
  topic: keywords
subject: Stress Distribution
  topic: keywords
subject: Flac2D
  topic: keywords
subject: Strip Footing
  topic: keywords
creator: Sadok Benmebarek
creator: Ahlem Guetari
creator: Mohamed-Saddek Remadna
rights: Copyright (c) 2018
date: 2018-06-27
publication date: 2018-06-27
starting page: 6
ending page: 6
doi: 10.69717/jaest.v4.i2.88

Thermal performance of the horizontal opening in the traditional houses of old Biskra. Case of traditional house at Bab Edarb
type: item
description: This research aims to revive a traditional architecture heritage of Biskra, which is thehorizontal opening in the roof of the "wast edar" named “raouzna". In order to evaluate thethermal performance of this element and measure its ability to control the distribution of interiortemperature in a region submitted to a hot and dry climate, an experimental study by numericalsimulation was carried out. DEROB-LTH program was used to perform the work of simulationwhich focused on one set of constant and variable factors. These factors are related to climatedata, thermal’s comfort zone and to the dimensions and shape of the raouzna. Some of the dataused for the simulation are based on the results of a typo-morphological analysis of a corpus oftraditional houses and a survey carried out upstream in the quarter of Bab Edarb (old Biskra). Thestudy focuses on the comparison between the recorded temperature inside the traditional houseand the outside air, and for periods critical of winter and summer represented respectively by thecoldest month and hottest: January and July.
subject: Research Paper
  topic: section
subject: Traditional architecture
  topic: keywords
subject: horizontal opening
  topic: keywords
subject: Raouzna
  topic: keywords
subject: Hot and dry climate
  topic: keywords
subject: Numerical simulation
  topic: keywords
subject: Thermal performance
  topic: keywords
creator: Meriem Madhoui-Benchikha
creator: Djamel Alkama
rights: Copyright (c) 2018
date: 2018-06-22
publication date: 2018-06-22
starting page: 6
ending page: 6
doi: 10.69717/jaest.v4.i2.87

Valorization of Vase Dam by the addition of the cement kiln Dust (CKD
type: item
description: This study is the valuation of the mud dam Charef - Djelfa Wilaya in basic layers ofmaterial by the chemical stabilization process based on the addition of cement kiln dust (CKD)who considered under product from the manufacture of cement. In this context we came throughparticle size analysis tests, plasticity, chemical analysis, compaction, and simple compression ondifferent samples of mud treated with different percentages of CKD and stored at a period of 28days to change the consistency of the untreated mud and was a firm consistency to a hard andstable consistency by adding a percentage of 20% CKD.
subject: Research Paper
  topic: section
subject: Mud
  topic: keywords
subject: Dam
  topic: keywords
subject: Charef
  topic: keywords
subject: Stabilization
  topic: keywords
subject: CKD
  topic: keywords
subject: Valorization
  topic: keywords
creator: Ahmed Bensalem
creator: Mekki Mellas
rights: Copyright (c) 2018
date: 2018-06-30
publication date: 2018-06-30
starting page: 4
ending page: 4
doi: 10.69717/jaest.v4.i2.86

Numerical study of the bearing capacity of a strip footing on tow layered clay under inclined loading
type: item
description: The bearing capacity of a strip footing resting on a homogeneous and isotropic soil hasbeen the subject of numerous theoretical and experimental studies. However, in practice the soilis never homogeneous. It is therefore important to introduce the effect of stratification on thebearing capacity. This paper aims to indicate the modifications that must be made to the bearingcapacity of a rough strip footing resting on two layered clay subjected to inclined load. The finite-difference code Fast Lagrangian Analysis of Continua (FLAC) is used to estimate the bearingcapacity factor Nc* as well as the failure envelope and the inclination factors ic, in the case ofinclined loading. The study is carried out considering two layers clays of different shear strengths,where the thickness of the upper clay layer is comparable to the width of a rigid footing. Theresults obtained show clearly that the bearing capacity of a strip footing is generally depends onthe strength ratio of the soil layers (cu1/cu2) and the relative thickness of the top layer (D/B).
subject: Research Paper
  topic: section
subject: Layered clays
  topic: keywords
subject: Strip footing
  topic: keywords
subject: inclined loading
  topic: keywords
subject: Bearing capacity
  topic: keywords
subject: shear strengths
  topic: keywords
creator: Abla Femmam
creator: Abdelhak Mabrouki
creator: Mekki Mellas
rights: Copyright (c) 2018
date: 2018-06-30
publication date: 2018-06-30
starting page: 7
ending page: 7
doi: 10.69717/jaest.v4.i2.85

Numerical modeling of the prestressing losses in prestressed concrete beams by modal analysis method
type: item
description: In this paper, a numerical modal analysis method is carried out to investigate the effectof cable strain loss on the natural frequencies in prestressed concrete beams. A simply supportedconcrete beam is modeled using the commercial finite element code ABAQUS. The beam iscomposed of concrete and prestressing strands. Firstly, a general geometrically nonlinear staticanalysis is carried out on the beam in order to obtain the camber deflection under differentprestressing magnitudes. The obtained equilibrium configuration is then used to perform a linearand nonlinear modal analysis. Thereby, a three dimensional finite element C3D8 is used for theconcrete in combination with a damaged plasticity model (CDP) are considered. Whereas, theprestressing strands are modeled with an embedded T2D2 truss element. The obtained resultsshow a good agreement with previous numerical and experimental works in literature.Furthermore, the study showed that the safety of prestressed beams depend mainly on the levelof prestressing load.
subject: Research Paper
  topic: section
subject: Prestress
  topic: keywords
subject: Embedded element
  topic: keywords
subject: Modal Analysis
  topic: keywords
subject: Material Non-linearity
  topic: keywords
subject: Finite Element Method
  topic: keywords
creator: Hamza Djeffal
creator: Mohamed Nadir Amrane
rights: Copyright (c) 2018
date: 2018-06-27
publication date: 2018-06-27
starting page: 5
ending page: 5
doi: 10.69717/jaest.v4.i2.84

Study and optimization of the windows’ impact on thermal comfort and energy efficiency (Case of offices in a hot and arid climate)
type: item
description: Controlling the thermal environment and reducing the energy consumption of buildings across the façade are a difficult challenge for architects, especially in a desert climate. The windows in particular play an important role in the tandem of the thermal operation of the building and the comfort of the users. The objective of this article is to study and optimize the impact of windows, their material and proportional characteristics on the thermal comfort and energy efficiency of office buildings in a hot and arid climate. The investigation is based on an empirical approach (measurements taken in situ on real cases) as well as on a numerical simulation study with the TRNSYS program. Several parameters have been studied such as surface temperature, ambient temperature and energy consumption. The results showed that facade windows are a determining factor in the thermal exchanges between the building and its environment and that the key parameters that condition these exchanges are the windows ratio (glazed area) and the type of glazing. The judicious choice of the windows ratio combined with an appropriate choice of the type and composition of the glazing improves the thermal comfort of the users and ensures the energy performance of the building.
subject: Research Paper
  topic: section
subject: Windows of the facade
  topic: keywords
subject: Thermal comfort
  topic: keywords
subject: Energetic efficiency
  topic: keywords
subject: Office building
  topic: keywords
subject: Simulation
  topic: keywords
subject: Hot and arid climate
  topic: keywords
creator: Mohamed-Amine Khadraoui
creator: Leila Sriti
rights: Copyright (c) 2018
date: 2018-06-09
publication date: 2018-06-09
doi: 10.69717/jaest.v4.i1.82

Effects of active mineral additions on the concrete behavior based on demolition sands
type: item
description: The exhaustion of natural aggregate deposits and the difficulties of opening new quarriesmake it necessary to look for new sources of supply. Recycling and recovery of waste are nowconsidered a solution for the future in order to meet the shortfall between production andconsumption and protect the environment. The objective of this study is to evaluate the effect ofactive mineral additions (Pozzolana, slag and silica fume) and inert (calcareous) on the behavior ofconcrete using recycled fine aggregates. The results obtained in this experimental study allow usto draw the conclusion that the use of additions (pozzolana , limestone fillers, silica fume and slag)improves the physico-mechanical and, more particularly, rheological characteristics of concretesbased on 50% of recycled fine aggregate.
subject: Research Paper
  topic: section
subject: Recycled aggregates
  topic: keywords
subject: Rheology
  topic: keywords
subject: Physical and mechanical
  topic: keywords
subject: Consistency
  topic: keywords
subject: Active mineral additions,
  topic: keywords
subject: Demolition
  topic: keywords
creator: Bouzidi Mezghiche
rights: Copyright (c) 2018
date: 2018-06-11
publication date: 2018-06-11
starting page: 5
ending page: 5
doi: 10.69717/jaest.v4.i2.83

A new frequency analysis for diagnosis of bearing defects in induction motors using the adaptive lifting scheme of wavelet transforms
type: item
description: This work describes a novel and effective application of the adaptive wavelet transformfor the detection of bearing faults on induction motor stator current. This transform is based on athree-step nonlinear lifting scheme: a fixed prediction followed by a space-varying update and a noadditive prediction. This transformation technique is used in a diversity of applications in digitalsignal processing and the transmission or storage of sampled data (notably the compression of thesound, or physical measurements of accuracy). Many faults in induction motor have beenidentified as bearing defects, rotor defects and external defects. Experimental results confirm theutility and the effectiveness of the proposed method for outer raceway fault diagnosis under noload and full load conditions.
subject: Research Paper
  topic: section
subject: Lifting schemes
  topic: keywords
subject: Faults
  topic: keywords
subject: Motor current signature analysis
  topic: keywords
subject: Fast Fourier transforms
  topic: keywords
subject: Diagnostic
  topic: keywords
subject: Fault diagnosis
  topic: keywords
creator: Wafa Bentrah
creator: Salim Sbaa
creator: Nadjiba Terki
creator: Noureddine Bessous
rights: Copyright (c) 2018
date: 2018-06-10
publication date: 2018-06-10
starting page: 8
ending page: 8
doi: 10.69717/jaest.v4.i2.81

Effect of urban morphology on thermal comfort in outdoor spaces: the case of the red village-El Kantara-Biskra
type: item
description: Climate urban design is today a topical issue dealt with in many recent studies. This paper aims to test the influence of urban morphology on external climatic conditions and the urban microclimate by dealing with the quantitative aspects of thermal comfort and the assessment of the thermal environment from an objective point of view. This is based on an on-site investigation based on the correlation between the geometry of the street, its orientation and the evolution of the physical variables (Ta, Tg, HR, Va). The measures were the subject of a campaign carried out in the urban fabric of the Ksar of Dachra El- Hamra (the red village), the first nucleus of the city of El Kantara in the wilaya of Biskra. The objective is to define the most efficient urban geometry in terms of summer thermal comfort by studying the true impacts of urban form on solar control and microclimatic conditions in arid regions. The evaluation of the thermal comfort in these external spaces is carried out by analyzing the calculated physiological temperature (PET) values based on the measured microclimatic parameters. The analysis of the results obtained from the investigation enabled us to demonstrate the considerable effect of the sky view factor, calculated by Rayman Pro 2.1 software, on the thermal fluctuations in the street.
subject: Research Paper
  topic: section
subject: Urban morphology
  topic: keywords
subject: Urban microclimate
  topic: keywords
subject: Outdoor thermal comfort
  topic: keywords
subject: Warm and arid climate
  topic: keywords
subject: Mean radiant temperature
  topic: keywords
creator: Sara Sedira
creator: Said Mazouz
rights: Copyright (c) 2018
date: 2018-05-26
publication date: 2018-05-26
doi: 10.69717/jaest.v4.i1.80

Vision Based Tracking and Interception of Moving Target by Mobile Robot Using Fuzzy Control
type: item
description: This paper presents a simple Fuzzy Logic Controllers (FLC) based control strategy to solvethe tracking and interception problem of a moving target by a mobile robot equipped with a pan-tilt camera. Before sending commands to the mobile robot, video acquisition and image processingtechniques are employed to estimate the target’s position in the image plane. The estimatecoordinates are used by a fuzzy logic controller to control the pan-tilt camera angles. The objectiveis to ensure that the moving target is always at the middle of the camera image plane. A secondFLC is used to control the robot orientation and to guarantee the tracking and interception of thetarget. The proposed pan-tilt camera and robot orientation controllers’ efficiency has beenvalidated by simulation under Matlab using Virtual Reality Toolbox.
subject: Research Paper
  topic: section
subject: Fuzzy controller
  topic: keywords
subject: Pan-Tilt
  topic: keywords
subject: Tracking
  topic: keywords
subject: Interception
  topic: keywords
subject: Target
  topic: keywords
subject: Mobile robot
  topic: keywords
creator: Mohamed Boumehraz
creator: Zineb Habba
creator: Rafia Hassani
rights: Copyright (c) 2018 https://creativecommons.org/licenses/by-nc/4.0
date: 2018-06-23
publication date: 2018-06-23
starting page: 7
ending page: 7
doi: 10.69717/jaest.v4.i2.79