LEREESI research documents

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Method for Indexing and Identifying Multimedia Documents
(European Patent Office, 2005-06-16) Essafi Hassane; Guezouli Larbi; Sayah Salima; Behloul Ali; Mandridake Clarisse; Essafi Louafi
The method for indexing multimedia documents comprises the following steps: (a) identification and extraction, for each document, of terms ti comprising vectors characterizing the properties of the document; (b) storage of terms ti in a term base comprising P terms; (c) determination of a maximum number N of desired concepts including the most relevant terms ti; (d) calculation of the matrix T of distances between the terms ti of the term base, (e) decomposition of the set P of terms ti of the term base into N parts Pj (1=j=N) such that P = P1 UP2 UPj UPN, each part Pj comprising a set of terms tij and being represented by a concept cj, terms ti being divided in such a manner that the furthermost terms are located in distinct parts Pl, Pm and the nearest terms are located in the same part Pl; (f) structuring of the dictionary of concepts and (g) construction of a prints base consisting of the set of concepts ci representing the terms ti of said documents, each document being associated with a print which is proper thereto.
Flavonoid glycosides and triterpenoids from Atractylis flava
(ELSEVIER, 2012-10-24) Chabani, Sonia; Haba, Hamada; Lavaud, Catherine; Benkhaled, Mohammed; Harakat, Dominique
Two new flavonoid glycosides, together with twelve known compounds including seven flavonoids and five triterpenoids were isolated from the whole plant Atractylis flava Desf. The structures of new compounds have been elucidated as 6-hydroxykaempferol 6-methyl ether 7-O-β-glucopyranuronoside (1) and isorhamnetin 3-O-[(6″′-O-E-feruloyl)-β-d-glucopyranosyl-(1 → 2)]-β-d-galactopyranoside (2) named Atraflavoside A and B successively, on the basis of physical and spectroscopic analysis, including 1D and 2D NMR (1H, 13C, COSY, TOCSY, HSQC, HMBC and NOESY) and mass spectrometry (HRESIMS) whereas those of the known compounds (3–14) were established by spectral comparison with those published in the literature.
Three new oleanane-type triterpene saponins from Atractylis flava
(ELSEVIER, 2015-12-11) Chabani, Sonia; Lavaud, Catherine; Benkhaled, Mohammed; Harakat, Dominique; Long, Christophe; Haba, Hamada
Three new bidesmosidic saponins (1–3), along with thirteen known metabolites consisting of two flavonoids and eleven triterpenoids were identified in dichloromethane and n-butanol extracts of the whole plant Atractylis flava Desf. The saponins were characterized as 3-O-[β-d-glucuronopyranosyl]-28-O-[β-d-xylopyranosyl-(1 → 4)-α-l-rhamnopyranosyl-(1 → 2)-β-d-xylopyranosyl]-16α-hydroxygypsogenic acid (1), 3-O-[β-d-glucuronopyranosyl]-28-O-[β-d-xylopyranosyl-(1 → 4)-α-l-rhamnopyranosyl-(1 → 2)-α-l-arabinopyranosyl]-16α-hydroxygypsogenic acid (2), and 3-O-[β-d-galactopyranosyl-(1 → 2)-β-d-glucuronopyranosyl]-28-O-[((3-O-acetyl)-β-d-xylopyranosyl)-(1 → 4)-((2-O-acetyl)-α-l-rhamnopyranosyl)-(1 → 2)-β-d-xylopyranosyl]-quillaic acid (3). Structures of all isolated compounds were elucidated by spectroscopic analysis, including 1D and 2D NMR (1H, 13C, COSY, HSQC, TOCSY, HSQC-TOCSY, HMBC, ROESY and NOESY), high-resolution electrospray ionization mass spectrometry (HRESIMS), acid hydrolysis, measurement of optical rotation and comparison with literature data.
Introduction au Calcul Formel: Maple & CAML
(Éditions Universitaires Européennes, 2016-01-01) Guezouli Larbi
Le calcul formel est un type de calcul qui permet de manipuler les grands nombres dans des calculs intensifs en utilisant des algorithmes optimisés dans le but de minimiser le temps de calcul. Appelé aussi calcul symbolique, pour compléter les méthodes de calcul numérique. Les logiciels de calcul formel ont beaucoup évolué au cours de ces dernières années. Ils sont destinés aux mathématiciens, aux informaticiens et aux utilisateurs qui utilisent les mathématiques comme les électroniciens, les mécaniciens, ... Ce document est destiné aux étudiants de la première année Licence tronc commun Math-Informatique. Il décrit un cours de 20 heures avec 20 heures de travaux pratiques. Les points traités dans ce cours sont indispensables pour pouvoir utiliser un logiciel de calcul formel. Les logiciels étudiés dans ce cours sont Maple et Caml.
Chemical composition of medicinal plant Atractylis serratuloides
(ELSEVIER, 2016-03-05) Chabani, Sonia; Haba, Hamada; Long, Christophe; Benkhaled, Mohammed
Phytochemical investigation of the roots of Atractylis serratuloides Sieber ex Cass. (Asteraceae) led to the isolation of nine compounds 1–9 including eight triterpenoids and one phenolic compound. Their structures were established on the basis of physical and spectroscopic analysis, including 1D and 2D NMR (1H, 13C, COSY, HSQC, and HMBC), mass spectrometry ESI, and by comparison with those published in the literature. Triterpenoids are typical compounds of Atractylis genus and could be useful as characteristic markers in chemotaxonomic research. In addition, isolated triterpenoids have previously showed many biological activities and might explain the use of A. serratuloides in traditional medicine.
Phytochemicals, Antihemolytic, Anti-inflammatory, Antioxidant, and Antibacterial Activities from Thymus Algeriensis
(TAYLOR & FRANCIS LTD, 2021-03-12) Mokhtari, Mouna; Chabani, Sonia; Mouffouk, Soumia; Aberkane, Mohamed-Cherif; Dibi, Ammar; Benkhaled, Mohammed; Haba, Hamada
The chemical composition and anti-inflammatory, antihemolytic, antioxidant, and antibacterial activities of solvent extracts of Thymus algeriensis in petroleum ether, chloroform, and n-butanol were evaluated. Ten compounds including four flavonoids, four phenolics, and two triterpenoids were isolated and identified by chromatography and spectroscopy. The n-butanol extract had the greatest antioxidant activity and inhibited hemolysis with a value of IC50 at 322.85 ± 0.87 µg mL−1. The chloroform extract exhibited the highest anti-inflammatory effect with 45.27% inhibition. The extracts demonstrated antibacterial activity against the tested strains.
A new flavonoid glycoside from the aerial parts of Diplotaxis erucoides (L.) DC. growing in Algeria
(TAYLOR & FRANCIS LTD, 2022-05-24) Mokhtari, Mouna; Chabani, Sonia; Alabdul Magid, Alabdulmagid; Benkhaled, Mohammed; Voutquenne-Nazabadioko, Laurence; Haba, Hamada
The phytochemical study of the 70% ethanol extract of the aerial parts of Diplotaxis erucoides afforded one new flavonoid glycoside, namely kaempferol-3-O-[α-L-rhamnopyranosyl-(1→2)-β-D-xylopyranoside]-7-O-α-L-rhamnopyranoside (1), named diploerucoside A and seven known compounds including one flavonoid (2), one phenolic glycoside (3), one monoterpene (4), one triterpene (5), one sitosterol (6) and two monoglycerolipids (7, 8). Their structures were established by extensive spectroscopic analysis including 1 D- and 2 D-NMR (1H, 13C, 1H-1H COSY, HSQC and HMBC), mass spectrometry (HR-ESI-MS) and by comparison with the data reported in the literature.
A comprehensive computational investigation of the physical properties of the novel quaternary Heusler alloys TiZrRhX (X = Al, Ga)
(Springer Nature, 2023-11-02) Turki, Bial Marouan; Righi, Haroun; Rached, Youcef; Rached, Djamel; Caid, Messaoud
Through an ab-initio calculation employing the full-potential linearised augmented plane-wave (FP-LAPW) method, we present detailed computational results of the physical properties of TiZrRhX (X = Al, Ga) quaternary Heusler (QH) alloys based on a new atomic configuration. The equilibrium ground state of properties was predicted, revealing that the newly investigated quaternary Heusler compounds are energetically stable in the α-phase structure within the ferromagnetic order. The present compounds' computed structural parameters are very similar to those obtained in theoretical data. The compounds' formation energies have been examined to determine the thermodynamical stability. Both compounds exhibit a half-metallic ferromagnetic behaviour with semiconductor character in the minority spin channel, as demonstrated by their magnetoelectronic properties. This tendency is confirmed by the integer values of total magnetic moments, which likewise follow the Slater–Pauling rule. To evaluate the compounds' thermoelectric performance and predict potential high-tech applications, the transport properties are also calculated across a wide temperature range, from 300 to 800 K.
Chemical constituents of Centaurea dissecta Ten. and sesquiterpenes chemotaxonomic significance
(PERGAMON-ELSEVIER SCIENCE LTD, 2024-03-06) Badaoui, Mohamed Ibrahim; Chabani, Sonia; Alabdul Magid, Abdulmagid; Voutquenne-Nazabadioko, Laurence; Sayagh, Charlotte; Harakat, Dominique; Haba, Hamada
The phytochemical investigation of Centaurea dissecta Ten. led to the isolation of thirty-two compounds of diverse chemical classes including two sesquiterpene lactones (1, 2), two sesquiterpenes (3, 4), twelve flavonoids (5–16), one lignan (17), twelve phenols (18–29), one triterpene (30) and two phytosterols (31, 32) from the EtOAc and n-BuOH soluble fractions of the 70% aqueous ethanol extract. Furthermore, the phenolic and flavonoid contents were measured for the petroleum ether, EtOAc and n-BuOH soluble fractions. The chemical structures of these compounds were determined by using a combination of NMR spectroscopic and mass spectrometry (ESI-MS) analyses, as well as by comparison with literature values. Only apigenin (15) was isolated previously from Centaurea affinis, and all other compounds were isolated for the first time from this species. Noticeably, ethyl ferulate (20), ethyl caffeate (21), synapyl aldehyde (22), coniferyl aldehyde (23), 2,3-dihydroxy-1-(4-hydroxy-3,5-dimethoxyphenyl)-1-propanone (24), and C-veratroylglycol (25), have not been reported from the genus Centaurea. All compounds have been previously isolated in various plants belonging to the Asteraceae family. Meanwhile, the chemotaxonomic significance of the isolated compounds was summarized.
A new 7,9′-monoepoxylignan glucoside and other phytochemicals from Centaurea granatensis and their chemotaxonomic significance
(PERGAMON-ELSEVIER SCIENCE LTD, 2024-07-30) Belaid, Meriem; Mouffouk, Soumia; Chabani, Sonia; Mouffouk, Chaima; Benkhaled, Mohammed; Haba, Hamada
The chemical study of Centaurea granatensis Boiss. ex DC. allowed the isolation and structural elucidation of eighteen secondary metabolites (1-18) from ethyl acetate (EtOAc) and n-butanol (n-BuOH) extracts. These compounds are divided into one new epoxylignan glucoside (1) and seventeen known phytochemicals including seven flavonoids (2-8), four triterpenes (9-12), and six phytosterols (13-18). Structures of the isolates were identified using various spectroscopic methods, namely 1D NMR (1H and 13C), 2D NMR (HSQC, 1H-1H COSY, HMBC, and NOESY), and mass spectrometry (HR-ESIMS), as well as by comparison with literature data. The obtained results showed the abundance of triterpenoids and flavonoids particularly flavones in C. granatensis. Apigenin (3) could be used as a chemotaxonomic marker of this genus due to its presence in approximately forty plant species. Furthermore, tiliroside (2) and stigmasteryl-3-O-β-D-glucoside-6′-palmitate (18) were first detected in Centaurea genus, but had previously been found in species of the Asteraceae family. Additionally, the chemotaxonomic significance of all isolated molecules was fully discussed.
Sustainable Energy and Fuels Materials, Processing Methods, and Development
(Taylor & Francis, 2024-10-30) Verma, Piush; Boubakeur, Ahmed; Mokhnache, Leila; Raj, Balwinder
Sustainability refers to the concept that all people should be able to meet their basic needs indefinitely, without compromising future generations. Sustainability, in terms of energy, embraces the same principles. One day the world will run out of fossil fuels. We need to realize how important sustainable energy is and its significance when it comes to the future of our planet. Sustainable energy includes any energy source that cannot be depleted and can remain viable forever. It does not need to be renewed or replenished; sustainable energy meets our demand for energy without any risk of failing or running out. This is why sustainable energy is the answer to our energy needs. Furthermore, sustainable energy doesn’t harm the environment (or at most, there is a minimal risk), increase climate change, or cost a heavy price. Although there is a cost associated with creating and building ways to capture sustainable energy, the energy sources themselves are typically free. The main objective of this book is to provide an up-to-date review of conduction mechanisms, structure construction, operation, performance evaluation, and applications of various renewable energies and fuels. The current trend in innovation is likely to explore the potential to connect novel materials, design methods, and new techniques, which would allow us to maintain existing resources and develop new methods by employing smart technologies. This book provides a complete insight into recent advancements in nanomaterials, renewable energy design, and applications. The purpose of this book is to provide relevant theoretical frameworks that include materials, modeling, circuit design, and the latest developments in experimental work in the field of renewable energy and fuels.
Enhancing Transparency in Batna's Public Transportation: A Cost-Effective Real-Time Bus Tracking and Route Optimization System
(Jomard Publishing, 2025-01-01) Alloui Zineb Nedjla; Bourebbou Fetima; Guezouli Larbi
Public transportation in Batna suffers from a lack of transparency, leading to inefficiencies, unreliable schedules, and a poor commute experience. This thesis presents a comprehensive and cost-effective bus tracking system that aims to modernize public transportation in the city. The proposed solution integrates a GPS-enabled Raspberry Pi device for real-time location tracking, an AI-powered backend that uses long-short-term memory (LSTM) networks for accurate estimated arrival time (ETA) predictions, and a mobile Android application for user interaction. The system also incorporates Dijkstra’s algorithm to offer optimized route planning. The emphasis was placed on low-cost hardware, lightweight web frameworks such as Flask, and secure communication via HTTPS and DDNS. The developed platform was tested and validated through real-world simulations, demonstrating significant improvements in route accuracy, ETA reliability. This work offers a modular and scalable foundation for improving public transportation in resource-constrained urban environments.
Chemical constituents from the Algerian ash Fraxinus dimorpha Coss. & Dur. and their chemotaxonomic significance
(PERGAMON-ELSEVIER SCIENCE LTD, 2025-03-21) Bouhentala, Sabrine; Chabani, Sonia; Benkhaled, Mohammed; Haba, Hamada
The investigation of the chemical composition of n-hexane and ethyl acetate extracts from the aerial parts of Fraxinus dimorpha resulted in the isolation of a new compound (1), identified as a fatty acid ester, along with fifteen previously reported secondary metabolites (2–16). These included one fatty acid (2), four triterpenoids (3–6), two phytosterols (7 and 8), three coumarins (9–11), one phenylpropanoid glucoside (12), three secoiridoids (13–15), and one free sugar (16). Among them, undecanoic acid (2), oleanolic acid acetate (4), lupeol (5) and lupenone (6) were identified for the first time within the Fraxinus genus. The structures of isolated compounds (1–16) were elucidated through extensive spectroscopic analyses such as 1D- and 2D-NMR and HR-ESI-MS as well as by comparing experimental data with those reported in the literature. Additionally, the chemotaxonomic significance of the isolated bioactive compounds was discussed.
Structural, elastic, electronic and optical properties of lead-free double perovskites halides Rb2AgYX6 (X F, Cl, Br, I) using DFT functional
(iopscience, 2025-05-30) Bahloul, Youcef; Bouzgou, Khelaf; Djaballah, Yacine; Righi, Haroun
In recent years, there has been a growing interest in the development of new materials that can serve as alternatives for next-generation energy technologies and replace lead-containing compounds. In this study we conducted thorough evaluation of the structural and mechanical stability of Rb2AgYX6 (X = F, Cl, Br, I) compounds using the Vienna Ab-initio Simulation Package program, applying the generalized gradient approximation potential to evaluate their optoelectronic properties. Our analysis revealed four materials that exhibit exceptional mechanical stability. All the halides were found to be structurally stable in the cubic phase. Elastic stability was further confirmed through the application of the Born stability criteria, based on calculated elastic constants C11, C12, and C44. The band gaps of Rb2AgYF6, Rb2AgYCl6, Rb2AgYBr6 and Rb2AgYI6 were found to be 2.87 eV, 3.6 eV, 3.10 eV and 2.47 eV respectively, and these band gaps are of an indirect nature. The findings indicate that all halogen-based double perovskites materials demonstrate significant potential as photovoltaic absorbers for solar cell applications, as well as in a variety of other applications. Consequently, these perovskite materials emerge as highly promising candidates for prospective applications within the energy sector.