http://mail.jetjournal.org/index.php/ajet/issue/feed Algerian Journal of Engineering and Technology 2024-12-28T00:00:00+01:00 Abdelkrim REBIAI editor@jetjournal.org Open Journal Systems <p>Algerian Journal of Engineering and Technology (AJET) is an international scholarly refereed research journal which aims to promote the theory and practice of technology, innovation, and engineering.</p> http://mail.jetjournal.org/index.php/ajet/article/view/491 Neutron irradiation effect on dielectic loss of bi-stretched polyethylene naphthalate 2024-10-30T21:05:20+01:00 Abdelhakim Belouadah hakim.34@outlook.com Sakina Berdous gebesadz@yahoo.fr Dalila Berdous berdousiness@yahoo.fr Ahcene Chaouchi ahchaouchi@yahoo.fr Nadia Saidi-Amroun amnadster@gmail.com <p><em>In the present work, the study of the evolution of the β<sup>∗</sup> process in both pristine and neutron irradiated bi-stretched polyethylene naphthalate films, is realized at a constant temperature and in the frequencies domain comprised between 10<sup>2</sup> and 10<sup>6</sup> Hz by using the impedance spectroscopy technique. The results show the presence of dielectric loss peak determined&nbsp; in 10<sup>5</sup> to 10<sup>6</sup>Hz frequency range, where the shape, position and the intensity are affected by morphological damage due to the large quantity of neutron beam energy transferred to the polymeric molecules that were highlighted by different structural analysis such as the Fourier transform infrared spectroscopy (FTIR) and the polarized light optical microscopy (PLOM). At room temperature, the FTIR technique showed an increase in the quantity of the carbonyl and naphthalene groups responsible of the presence of the Sub-Tg dielectric relaxation in the volume of the irradiated BSPEN (IR-BSPEN) film due to the amorphization phenomena traduced, respectively, by the absence and&nbsp; presence of the absorption bands characteristics of crystalline and amorphous phases. The PLOM characterization, revealed change in the texture of the IR-BSPEN surface indicating by the appearance of&nbsp; microcracks which contribute to the oxidation of macromolecular chains. The study of the effect of temperature on the dielectric behavior of non irradiated BSPEN film, in β<sup>∗</sup> region, showed that the dielectric parameters such as the maximum of dielectric losses and its position are thermally activated. This dielectric response has not identified in the case of&nbsp; irradiated BSPEN film, for which the evolution of losses with temperature change above T = 333K.</em></p> 2024-12-28T00:00:00+01:00 Copyright (c) 2024 Abdelhakim Belouadah, Sakina Berdous, Dalila Berdous, Ahcene Chaouchi, Nadia Saidi-Amroun http://mail.jetjournal.org/index.php/ajet/article/view/457 Effect of Using Recycled Fine Aggregate on Concrete Performance 2024-10-29T11:15:46+01:00 arshd Y. Ismail arshed.22enp13@student.uomosul.edu.iq Ashtar S Al-Luhybi aziztaher@uomosul.edu.iq Khalaf I. Mohammad kimjebouri@uomosul.edu.iq <p>The practical use of recycled aggregate produced from crushing concrete waste in the production of new concrete reduces the consumption of natural aggregate and also reduces the amount of concrete waste that ends up in landfills. This study addresses the properties of concrete containing recycled fine aggregate (RFA) obtained from existing waste in Mosul. Four sets of concrete mixtures with different compressive strength (25, 30, 35 and 40MPa) were prepared, and for each strength, the effect of changing the replacement ratios of natural fine aggregate with recycled fine aggregate was studied, where four different ratios (0, 10, 20, 30)% of recycled fine aggregate (RFA) were adopted. The focus was on the compressive strength of concrete containing recycled fine aggregate due to the importance of this property as an indicator of concrete feature and the main determinant of its quality and the most important factor in design. The results showed a gradual decrease in the fresh properties of concrete containing recycled fine aggregate, such as slump and fresh density, as the proportion of recycled aggregate increased. However, there was an improvement in the compressive strength of the concrete mixes. Based on the practical results, equations were derived to predict the compressive strength of concrete containing recycled fine aggregate. According to the theoretical results obtained through analysis of variance (ANOVA), it was found that adding recycled fine aggregate at a rate of 20% is considered the best proportion, although the change in compressive strength is not significant<em>.</em></p> 2024-12-28T00:00:00+01:00 Copyright (c) 2024 arshd Y. Ismail, Ashtar S Al-Luhybi, Khalaf I. Mohammad http://mail.jetjournal.org/index.php/ajet/article/view/452 A Simulation and Analysis of I(V) and P(V) Characteristics of a Photovoltaic module under MATLAB/SIMULINK Connected to the Electrical Grid 2024-11-02T10:55:51+01:00 Anouar benhaimoura benhaimouraanouar@gmail.com Aissa Souli a.souli@crnb.dz <p><em>The objective of our work is the simulation and analysis of the I(V) and P(V) characteristics of a photovoltaic module under MATLAB/SIMULINK connected to the electrical network. </em><em>To achieve this goal, we followed the following steps: </em><em>At the start of work;</em> <em>we performed a simulation of a photovoltaic cell (photovoltaic module).</em> <em>By two methods: by simulation of the mathematical data of the model of a photovoltaic module inspired by the electrical diagram of a photovoltaic cell, by the use of the mathematical equations of: inverse saturation current, saturation current, photonic current, current of the</em> <em>shunt resistance, and the output current to create from each equation a model in MATLAB/SIMULINK, then we collect and connect these models according to the mathematical equation to obtain the final model of the output current of a photovoltaic module, and</em> <em>on the other hand by simulation through the model of the solar cell which exists in the SIMULINK library by checking the data of each box coming from this source.</em> <em>then we showed the Simulation of the BOOST converter with MPPT, and we presented the functional diagram of the PV generator and the BOOST converter with MPPT under MATLAB/SIMULINK, In the same context, we showed the voltage curve at the output of the command</em> <em>MMPT in MATLAB, the current curve at the output of the chopper booster, the curve of the voltage measured at the converter, the curve of the current measured at the converter, the curves of the phase currents of the network and the reference current, and the curve of</em> <em>PV generator power and Pmpp power At the end of the work, we connected this photovoltaic module to an electrical network, to see the impact of our network on the photovoltaic module and vice versa.</em> <em>Finally we explained and interpreted the results obtained according to our points of view.</em></p> 2024-12-28T00:00:00+01:00 Copyright (c) 2024 Anouar benhaimoura, Aissa Souli http://mail.jetjournal.org/index.php/ajet/article/view/399 Non-destructive multielement analysis of airborne particles by instrumental neutron activation analysis 2024-03-13T11:15:41+01:00 Abderrahmane Ararem a.ararem@crnb.dz Hocine Slamene h.slamene@crnb.dz Omar Dendene o.denden@crnb.dz <p>Instrumental neutron activation analysis (INAA) was used for the determination of the elemental composition of aerosol samples. Two samples of air of approximately 20 m<sup>3</sup> each one were collected of the atmosphere around the Es-Salam research reactor site in Algeria. The irradiation of the samples and reference materials was carried out during 30 s for the elements of short half-life and 06 h for the elements of medium and long half-life with a thermal neutrons flux of 1.12 10<sup>13</sup> and 6.88 10<sup>13</sup> n/cm²s respectively. Ge(Hp) g-spectrometry made it possible to determine&nbsp; fifteen&nbsp; elements (Al, Cl, Mn, Ca, Cd, Br, La, Fe, Nd, Ce, Hg, Cr, Hf, Sb and Zn). The obtained results for the used reference materials almost perfectly match its certified values (Z<sub>score</sub>&lt;2).</p> 2024-03-09T00:00:00+01:00 Copyright (c) 2024 Abderrahmane Ararem, Hocine Slamene, Omar Dendene http://mail.jetjournal.org/index.php/ajet/article/view/370 An overview of the relative neutron activation analysis performed in the NAA Laboratory of the CRND using NUR reactor 2024-03-09T01:08:00+01:00 Zohra Bouhila Tarek Azli Abderrezak Hadri Dallel Boukhadra Sofiane Benbouzid Ramy Nouri Amina Chettah <p>Neutron activation analysis is a highly sensitive method for multi-elemental analysis, primarily focusing on the induced radioactivity in atomic nuclei rather than the inherent chemical and physical properties of samples. This approach requires exposing the sample to neutron irradiation, typically conducted within a nuclear reactor. One of the most successful applications of Instrumental Neutron Activation Analysis (INAA) in the vicinity of the NUR reactor pertains to its use in environmental studies. It facilitates the monitoring of the distribution of trace elements (TEs) and the attribution of emission sources by analyzing samples from diverse environmental sources, including soil, air, and bioaccumulative plants collected from various locations near Algiers, Algeria. Since 2010, our laboratory has actively engaged in proficiency tests with WEPAL/IAEA, which has been instrumental in advancing and refining the methods of Neutron Activation Analysis (NAA) employed in this domain. The outcomes derived from these environmental investigations substantiate the presence of more than 30 trace elements. Comparing the enrichment factors (FEs) reveals the contribution of anthropogenic pollution, such as vehicles emitting Sb, Se, and Zn, brickyards releasing As, Co, Cr, Fe, Na, Se, Sc, Ta, and Tb, as well as soil resuspension leading to the release of Br and Zn. Additionally, our laboratory has conducted further studies in the realm of biology using the relative approach of NAA. The primary objective has been to harness the potential of NAA for early diagnosis in cases of cancer and chronic diseases. Consequently, we've examined the trace element composition in the whole blood of both healthy individuals and those afflicted by illnesses. We achieved this by subjecting lyophilized blood samples from adult subjects to simultaneous irradiation alongside an A13-IAEA blood standard. The elemental concentrations were subsequently calculated by measuring gamma rays using a gamma spectrometer. We simultaneously determines the concentrations of ten elements: Rb, Fe, Zn, Na, K, Br, Se, Sr, As and Sc.</p> 2023-12-28T00:00:00+01:00 Copyright (c) 2023 Zohra Bouhila, Tarek Azli, Abderrezak Hadri, Dallel Boukhadra, Sofiane Benbouzid, Ramy Nouri, Amina Chettah