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                <text>Hanafi, Abdelhakim</text>
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                <text>Alkama, Djamel</text>
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                <text>Les espaces publics ouverts, surtout les places publiques sont pour la rencontre de la population, la communication, la convivialité, etc… Afin que ces espaces jouent leur rôle, il y règne un environnement physique confortable. L’usage optimal de ces espaces mérite une connaissance détaillée de tous les éléments qui peuvent améliorer les conditions climatiques d’utilisation de ces derniers. L'objectif du présent article est d’étudier et d’analyser le rôle joué par la végétation (le végétal urbain) dans l’espace extérieur urbain; vu que c’est une composante fondamentale de ce dernier; dont elle minimise et intercepte les rayons solaires, un facteur très important du confort thermique à l’extérieur. Elle réduit les températures de l’air, génère de l’ombre, absorbe les flux radiatifs. En général, elle participe à la modification positive des ambiances physiques (chaleur, humidité, lumière,…). Sachant que les gens des villes sahariennes, (climat chaud et zone aride) cherchent à s’abriter contre les rayons solaires par tous les moyens, surtout durant la période estivale. A cette dernière, la majorité des gens sont touchés par le stress thermique, vu le manque de fraîcheur et de l’ombre, et cela, les pousse à abandonner les places publiques, et rejoindre les espaces bâtis, tout en utilisant la climatisation, qui engendra une importante consommation d’énergie (électricité). L’investigation 'in situ' a touché la dimension climatique, la température ambiante, l'humidité, l'ensoleillement, le rayonnement solaire, etc… et l’insertion du végétal urbain (par simulation) comme un masque contre les rayons solaires. Les résultats obtenus confirment le rôle primordial du végétal urbain dans la création de l’ombre, qui a amélioré le confort thermique des places publiques et ensuite la qualité de la vie urbaine. Or on s’est limité, dans cet article, à exposer un seul exemple de la recherche. Il s’agit d'une place publique (Ben Badis) de la ville de Biskra/Algérie, ville saharienne, (à climat sec et de zone aride). La technique suivie dans ce travail est une combinaison entre les mesures des facteurs climatiques nécessaires 'in situ' et la simulation par le biais d’un logiciel.</text>
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                <text>https://revue.cder.dz/index.php/rer/article/view/585</text>
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                <text>Copyright (c) 2021 Journal of Renewable Energies</text>
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                <text>Journal of Renewable Energies; Vol. 19 No. 3 (2016): Volume 19 (Regular); 465 - 480</text>
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                <text>Journal of Renewable Energies; Vol. 19 No 3 (2016): Volume 19 (Regular); 465 - 480</text>
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                <text>2716-8247</text>
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                <text>Végétal urbain</text>
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                <text>Ombre</text>
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                <text>Confort thermique</text>
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                <text>Rayonnement solaire</text>
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                <text>PET</text>
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                <text>Ray Man</text>
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                <text>Ville saharienne</text>
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                <text>Place publique</text>
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                <text>Stratégie d’amélioration du confort thermique d’une place publique d’une ville saharienne 'Biskra/Algérie'</text>
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            <name>Creator</name>
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              <elementText elementTextId="272592">
                <text>Aboubakar</text>
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                <text>Boli, Zala</text>
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                <text>Mbofung, Carl Moses Fontum</text>
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                <text>Cette étude cible la valorisation des déjections bovines et avicoles pour la production du biogaz afin de permettre une bonne gestion de ces dernières (déjections) au Centre National de Formation Zootechnique, Vétérinaire et Halieutique (Centre Zootechnique) de Maroua. Pour venir à bout de cet objectif, la quantification des déjections produites a été la première à être faite. Ensuite, nous avons entrepris une série d’expériences, pour fermenter les différents substrats et produire du biogaz inflammable. La biomasse des déjections collectées a subi un prétraitement mécanique. Les substrats ainsi prélevés ont alimenté des micro-bioréacteurs de 25 litres suivant trois doses à savoir: 1/2, 1/3 et 1/4 pour la bouse bovine, et 1/3, 1/4 et 1/5 pour la fiente avicole. Ainsi, le dispositif expérimental comptait six (06) bio digesteurs. Enfin, un dimensionnement des compartiments du digesteur a été fait. Il ressort une productivité moyenne de 170 kg de déjections animales par jour, soit environ 62 t/an. En terme de quantité du biogaz généré, un kilogramme du substrat bouse de vache à la dose de 1/3 fourni 100 L de biogaz avec une proportion d’environ 89 % de gaz inflammable soit 2% et 6% supérieur à ceux à la dose de 1/4 et 1/2 respectivement. De même, le potentiel du substrat fiente de poulet à la dose de 1/5 est de 130 L avec une proportion d’environ 80 % de gaz inflammable, soit 2% et 8% supérieur à ceux des substrats fientes de poulet à la dose de 1/4 et 1/3 respectivement. La production brute du biogaz par la fiente de poule reste supérieure de 12 % à celle de la bouse. Le système à dôme fixe a été retenu avec un volume du digesteur de 36 m3, un volume du réservoir à gaz de 11.7 m3 et un volume du réservoir de prétraitement de 1.8 m3.</text>
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                <text>https://revue.cder.dz/index.php/rer/article/view/584</text>
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                <text>10.54966/jreen.v19i3.584</text>
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                <text>Renewable Energy Development Center</text>
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                <text>https://revue.cder.dz/index.php/rer/article/view/584/1264</text>
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              <elementText elementTextId="272603">
                <text>Copyright (c) 2021 Journal of Renewable Energies</text>
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                <text>https://creativecommons.org/licenses/by-sa/4.0</text>
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              <elementText elementTextId="272605">
                <text>Journal of Renewable Energies; Vol. 19 No. 3 (2016): Volume 19 (Regular); 447 - 464</text>
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                <text>Journal of Renewable Energies; Vol. 19 No 3 (2016): Volume 19 (Regular); 447 - 464</text>
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                <text>2716-8247</text>
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            <description>The topic of the resource</description>
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                <text>Cow dung</text>
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                <text>Poultry droppings</text>
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                <text>Biogas</text>
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                <text>Methanisation</text>
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                <text>Etude du potentiel biogaz des déjections animales: bouses de bovins et fientes de volailles d’un centre zootechnique à Maroua - Cameroun</text>
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                <text>Gouidmi, Hamza</text>
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                <text>Beghidja, Abdelhadi</text>
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                <text>Benderradji, Razik</text>
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                <text>Ihaddadène, Nabila</text>
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                <text>Raouache, Elhadj</text>
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                <text>Journal of Renewable Energies; Vol. 19 No. 3 (2016): Volume 19 (Regular); 429 - 438</text>
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                <text>Journal of Renewable Energies; Vol. 19 No 3 (2016): Volume 19 (Regular); 429 - 438</text>
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                <text>Onde de choc conique</text>
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                <text>Interaction des ondes de chocs coniques des écoulements axisymétriques supersoniques</text>
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                <text>Youcef, Ahmed</text>
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                <text>Saim, Rachid</text>
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                <text>Partant d’un constat que, vu les faibles propriétés thermo physiques de l’air utilisé comme fluide caloporteur, les capteurs solaires à air ne donnent que des rendements médiocres. Il a été jugé très utile de disposer des obstacles "chicanes" de formes diverses et variées dans le conduit des capteurs solaires. Ceci augmente le transfert thermique entre l'absorbeur et le fluide caloporteur, ce qui améliore clairement l’efficacité thermique du capteur solaire à air. Cet article consiste en une étude numérique de la convection forcée d'un écoulement d’air à l'intérieur d'un capteur solaire avec un flux de chaleur uniforme sur la surface externe de l’absorbeur. Le fluide est considéré laminaire, Newtonien, incompressible avec des propriétés constantes. Les équations gouvernantes, ont été intégrées et discrétisées selon l'approche des volumes finis. La procédure Simple a été utilisée pour la résolution du système d’équations algébriques fortement couplées (température- vitesse et gradient axial de pression- vitesse). Pour une meilleure disposition des ailettes sur la plaque absorbante, les profils de vitesse axiale, les champs de vitesse et de température sont présentés pour un cas d’exemple type pour la ville de Tlemcen (Algérie).</text>
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                <text>Copyright (c) 2021 Journal of Renewable Energies</text>
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                <text>Journal of Renewable Energies; Vol. 19 No. 3 (2016): Volume 19 (Regular); 415 - 427</text>
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                <text>Convection</text>
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                <text>Etude numérique de l’influence de disposition des chicanes sur le comportement dynamique et thermique d’un écoulement dans un échangeur de chaleur</text>
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                <text>Boulal, Ahmed</text>
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                <text>Khelafi, Mostefa</text>
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                <text>Gaffour, Hafida</text>
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                <text>Bakache, Younes</text>
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                <text>La recherche d’une nouvelle source d’énergie naturelle inépuisable accompagnée d’une technologie hors le pétrole et son raffinage a pour l’apparition des biocarburants, tels que le biodiesel provenue de la transestérification d’une huile végétale usagée. Ce travail est consacré à l’étude de la transestérification d’une huile végétale usagée et l’influence des différents paramètres affectant la synthèse de biodiesel tels que; le rapport (alcool/huile), la quantité du catalyseur ajouté (% en NaOH), la température T (°C). Les résultats trouvés montrent qu’une augmentation du rapport alcool/huile implique une amélioration du rendement (R) du procédé de transestérification jusqu’à atteindre un rapport de ½ pour le quel un rendement de 71% est obtenue.</text>
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                <text>https://revue.cder.dz/index.php/rer/article/view/580</text>
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                <text>Renewable Energy Development Center</text>
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              <elementText elementTextId="272527">
                <text>Copyright (c) 2021 Journal of Renewable Energies</text>
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                <text>Journal of Renewable Energies; Vol. 19 No. 3 (2016): Volume 19 (Regular); 409 - 413</text>
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                <text>Journal of Renewable Energies; Vol. 19 No 3 (2016): Volume 19 (Regular); 409 - 413</text>
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                <text>2716-8247</text>
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                <text>Trans-estérification</text>
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                <text>Biodiesel</text>
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                <text>Huile végétale usagée</text>
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                <text>Biocarburant</text>
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            <name>Title</name>
            <description>A name given to the resource</description>
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                <text>Synthèse de biodiesel en utilisant des huiles végétales usagées</text>
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                <text>Sad Chemloul, Noureddine</text>
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                <text>Belmiloud, Mohamed Amine</text>
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                <text>La convection naturelle est étudiée numériquement dans une cavité carrée dont la paroi horizontale inférieure et la paroi verticale droite sont chauffées à une température TH . La paroi verticale gauche et la paroi horizontale supérieure sont à la température  , l’espace restant des parois formant la cavité est supposé adiabatique. On utilisé le nanofluide avec trois différents types de nanoparticules  La fraction volumique des nanoparticules est prise dans l’intervalle . Le nombre de Rayleigh est compris entre 103 et 106 , et le nombre de Prandtl est fixé à Pr=2.6 . L’objectif de cette étude de d’étudier l’effet de la nature de nanofluides, de la fraction volumique des nanoparticules et la variation du nombre de Rayleigh sur l’amélioration du transfert de chaleur convectif. Les résultats de la simulation montrent que le transfert thermique augmente avec l’augmentation du nombre Rayleigh, et de la fraction volumique. Cette augmentation du transfert de chaleur est remarquable pour le nano fluide Cu-eau.</text>
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                <text>https://revue.cder.dz/index.php/rer/article/view/577</text>
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                <text>eng</text>
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                <text>Renewable Energy Development Center</text>
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              <elementText elementTextId="272501">
                <text>Copyright (c) 2021 Journal of Renewable Energies</text>
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                <text>Journal of Renewable Energies; Vol. 19 No. 3 (2016): Volume 19 (Regular); 397 - 408</text>
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                <text>Journal of Renewable Energies; Vol. 19 No 3 (2016): Volume 19 (Regular); 397 - 408</text>
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                <text>Etude numérique</text>
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                <text>Convection naturelle</text>
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                <text>Nanoparticules</text>
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                <text>Effet des nanoparticules sur l’amélioration du transfert thermique dans une cavité carrée</text>
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                <text>Journal of Renewable Energies; Vol. 19 No. 3 (2016): Volume 19 (Regular); 377 - 386</text>
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                <text>Modules PV</text>
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                <text>A computational analysis of steady state turbulent forced convection flow in a two-dimensional isothermal-wall rectangular channel provided by detached solid flat bars with the same cross-sectional areas in a tandem arrangement is carried out in the present work. The fluid (air) is considered, Newtonian, incompressible with constant properties. The Reynolds number based on the hydraulic diameter of the channel is varied between 10.000 and 25.000. The governing equations are solved by the Finite Volumes Method and the Simplec-algorithm, in two dimensions, employing the Commercial CFD software Fluent 6.3 with the k-E standard model to describe the turbulence. In particular, fields and profiles of axial velocity, local and average heat transfer coefficients as well as pressure loss were examined along the channel at constant wall temperature condition along the top and bottom walls. The parameters of the numerical study are the Reynolds number and the flat bar size. The results reveal essentially, that the size of the bars can alter substantially the airflow and convective heat transfer characteristics. The numerical data indicates that an increase in the bar height causes a substantial increase in the Nusselt number but the pressure loss is very significant for all Reynolds numbers used.</text>
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                <text>https://revue.cder.dz/index.php/rer/article/view/573</text>
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                <text>10.54966/jreen.v19i3.573</text>
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                <text>eng</text>
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                <text>Renewable Energy Development Center</text>
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              <elementText elementTextId="272395">
                <text>https://revue.cder.dz/index.php/rer/article/view/573/1256</text>
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                <text>Copyright (c) 2021 Journal of Renewable Energies</text>
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                <text>https://creativecommons.org/licenses/by-sa/4.0</text>
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              <elementText elementTextId="272398">
                <text>Journal of Renewable Energies; Vol. 19 No. 3 (2016): Volume 19 (Regular); 345 - 366</text>
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                <text>Journal of Renewable Energies; Vol. 19 No 3 (2016): Volume 19 (Regular); 345 - 366</text>
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              <elementText elementTextId="272400">
                <text>2716-8247</text>
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              <elementText elementTextId="272401">
                <text>1112-2242</text>
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              <elementText elementTextId="272402">
                <text>10.54966/jreen.v19i3</text>
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          <element elementId="49">
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                <text>Forced convection</text>
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                <text>Pressure loss</text>
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                <text>Complex geometry</text>
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                <text>Flat bars</text>
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                <text>CFD</text>
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                <text>Computational analysis of heat transfer and fluid flow characteristics over flat bars of different heights</text>
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