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Laouar</title> <meta name="description" content="Search results for: Rabah Laouar"> <meta name="keywords" content="Rabah Laouar"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none navbar-toggler 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id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="Rabah Laouar"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 36</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: Rabah Laouar</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">36</span> The EAO2 in Essouabaa, Tebessa, Algeria: An Example of Facies to Organic Matter</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sihem%20Salmi%20Laouar">Sihem Salmi Laouar</a>, <a href="https://publications.waset.org/abstracts/search?q=Khoudair%20Chabane"> Khoudair Chabane</a>, <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Laouar"> Rabah Laouar</a>, <a href="https://publications.waset.org/abstracts/search?q=Adrian%20J.%20Boyce%20et%20Anthony%20E.%20Fallick"> Adrian J. Boyce et Anthony E. Fallick </a> </p> <p class="card-text"><strong>Abstract:</strong></p> The solid mass of Essouabaa belongs paléogéography to the field téthysian and belonged to the area of the Mounts of Mellègue. This area was not saved by the oceanic-2 event anoxic (EAO-2) which was announced, over one short period, around the limit cénomanian-turonian. In the solid mass of Essouabba, the dominant sediments, pertaining to this period, are generally fine, dark, laminated and sometimes rolled deposits. They contain a rather rich planktonic microfaune, pyrite, and grains of phosphate, thus translating an environment rather deep and reducing rather deep and reducing. For targeting well the passage Cénomanian-Turonian (C-T) in the solid mass of Essouabaa, of the studies lithological and biostratigraphic were combined with the data of the isotopic analyses carbon and oxygen like with the contents of CaCO3. The got results indicate that this passage is marked by a biological event translated by the appearance of the "filaments" like by a positive excursion of the δ13C and δ18O. The cénomanian-turonian passage in the solid mass of Essouabaa represents a good example where during the oceanic event anoxic a facies with organic matter with contents of COT which can reach 1.36%. C E massive presents biostratigraphic and isotopic similarities with those obtained as well in the areas bordering (ex: Tunisia and Morocco) that throughout the world. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=limit%20c%C3%A9nomanian-turonian%20%28C-T%29" title="limit cénomanian-turonian (C-T)">limit cénomanian-turonian (C-T)</a>, <a href="https://publications.waset.org/abstracts/search?q=COT" title=" COT"> COT</a>, <a href="https://publications.waset.org/abstracts/search?q=filaments" title=" filaments"> filaments</a>, <a href="https://publications.waset.org/abstracts/search?q=event%20anoxic%202%20%28EAO-2%29" title=" event anoxic 2 (EAO-2)"> event anoxic 2 (EAO-2)</a>, <a href="https://publications.waset.org/abstracts/search?q=stable%20isotopes" title=" stable isotopes"> stable isotopes</a>, <a href="https://publications.waset.org/abstracts/search?q=mounts%20of%20Mell%C3%A8gue" title=" mounts of Mellègue"> mounts of Mellègue</a>, <a href="https://publications.waset.org/abstracts/search?q=Algeria" title=" Algeria"> Algeria</a> </p> <a href="https://publications.waset.org/abstracts/25989/the-eao2-in-essouabaa-tebessa-algeria-an-example-of-facies-to-organic-matter" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/25989.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">515</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">35</span> The Chromitites of the Collo Ultramafic Rocks (NE Algeria): Two Generations Evidenced From Petrological, Mineralogical and Isotopic Studies</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Laouar">Rabah Laouar</a>, <a href="https://publications.waset.org/abstracts/search?q=Yahia%20Boudra"> Yahia Boudra</a>, <a href="https://publications.waset.org/abstracts/search?q=Adel%20Satouh"> Adel Satouh</a>, <a href="https://publications.waset.org/abstracts/search?q=Adrian%20Boyce"> Adrian Boyce</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The ultramafic rocks of the Collo region crop out as « stratified » masses that cross-cut older metamorphic formation of the basement. These rocks are mainly peridotites and serpentinites. The peridotites are composed of olivine, orthopyroxene, clinopyroxene and spinel (chromite). The chemical composition of these lherzolites show a magnesian character with high MgO contents (34.4 to 37.5%), high Cr (0.14 to 0.27%), Ni (0.14 to 0.26%) and Co (34 to 133 ppm) and low CaO and Al₂O₃ (0.02 to 2.2 and 0.5 to 2.8 % respectively). They represent a residue (restite) of a mantle magmas partial melting. The chromite which represents about 2 to 3% of the rock is a ubiquitous mineral and shows two different generations: primary idiomorphic millimetric crystals and secondary very fine, xenomorphic and interstitial aggregates. The primary chromites are alumino-ferro-magnesian crystals. They show high Al₂O₃ (25.77% to 27.36%) and MgO (10.70% to 13.36%). Cr# (100*Cr/ (Al+Cr)) varies between 45 and 48, and Mg# (100*Mg/Mg+Fe₂+) varies between 49 and 59. On the other hand, the secondary interstitial grains are iron-rich chromites; they show low Al₂O₃ (4.67% to 9.54%) and MgO (4.60% to 4.65%). Cr# is relatively high (77 to 88) whereas Mg# show relatively low values, varying between 22 and 25. Oxygen isotopic composition of both types of chromites is consistent with their derivation from a mantle source (ð¹⁸O vary between +3.9 and +5.2‰), though a contribution of ¹⁶O-rich component to the secondary chromites is not ruled out. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=peridotites" title="peridotites">peridotites</a>, <a href="https://publications.waset.org/abstracts/search?q=serpentinites" title=" serpentinites"> serpentinites</a>, <a href="https://publications.waset.org/abstracts/search?q=chromite" title=" chromite"> chromite</a>, <a href="https://publications.waset.org/abstracts/search?q=partial%20melting" title=" partial melting"> partial melting</a>, <a href="https://publications.waset.org/abstracts/search?q=collo" title=" collo"> collo</a>, <a href="https://publications.waset.org/abstracts/search?q=Algeria" title=" Algeria"> Algeria</a> </p> <a href="https://publications.waset.org/abstracts/157039/the-chromitites-of-the-collo-ultramafic-rocks-ne-algeria-two-generations-evidenced-from-petrological-mineralogical-and-isotopic-studies" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/157039.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">89</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">34</span> Hypersonic Flow of CO2-N2 Mixture around a Spacecraft during the Atmospheric Reentry</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Zineddine%20Bouyahiaoui">Zineddine Bouyahiaoui</a>, <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Haoui"> Rabah Haoui</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The aim of this work is to analyze a flow around the axisymmetric blunt body taken into account the chemical and vibrational nonequilibrium flow. This work concerns the entry of spacecraft in the atmosphere of the planet Mars. Since the equations involved are non-linear partial derivatives, the volume method is the only way to solve this problem. The choice of the mesh and the CFL is a condition for the convergence to have the stationary solution. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=blunt%20body" title="blunt body">blunt body</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20volume" title=" finite volume"> finite volume</a>, <a href="https://publications.waset.org/abstracts/search?q=hypersonic%20flow" title=" hypersonic flow"> hypersonic flow</a>, <a href="https://publications.waset.org/abstracts/search?q=viscous%20flow" title=" viscous flow"> viscous flow</a> </p> <a href="https://publications.waset.org/abstracts/85387/hypersonic-flow-of-co2-n2-mixture-around-a-spacecraft-during-the-atmospheric-reentry" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/85387.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">234</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">33</span> Occurrence of Aspidiscus cristatus (Lamarck) in the 'Marnes De Smail' from the Bellezma-Batna Range (Algeria): An Index Species for the Middle Cenomanian </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Salmi-Laouar%20Sihem">Salmi-Laouar Sihem</a>, <a href="https://publications.waset.org/abstracts/search?q=Aouissi%20Riadh"> Aouissi Riadh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The Cenomanian formations of the Bellezma-Batna Range are yielding very diversified fossiliferous beds. Among the abundant and well-preserved fossils stands out Aspidiscus cristatus (Lamarck). This taxon is assigned to the Family Latomeandridae (Alloiteau) for the presence of six symmetry axes. The outer morphology of sampled specimens documents a low-energy environment with a high sedimentary rate and a mud-supported bottom. Its provincialism evidences some characteristic thermal gradients of the marked Tethysian climatic areas. Biometric measurements are given. Coral size increases from the North towards the southeastern Tethysian margin where waters are supposed warmer; this feature is also underlined by a frequent bio-erosion of sampled specimens. Its limited stratigraphic range makes it a good candidate for an index species for the Middle Cenomanian. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Aspidiscus%20cristatus" title="Aspidiscus cristatus">Aspidiscus cristatus</a>, <a href="https://publications.waset.org/abstracts/search?q=coral" title=" coral"> coral</a>, <a href="https://publications.waset.org/abstracts/search?q=Middle%20Cenomanian" title=" Middle Cenomanian"> Middle Cenomanian</a>, <a href="https://publications.waset.org/abstracts/search?q=Batna" title=" Batna"> Batna</a>, <a href="https://publications.waset.org/abstracts/search?q=Bellezma" title=" Bellezma"> Bellezma</a>, <a href="https://publications.waset.org/abstracts/search?q=Algeria" title=" Algeria"> Algeria</a> </p> <a href="https://publications.waset.org/abstracts/87330/occurrence-of-aspidiscus-cristatus-lamarck-in-the-marnes-de-smail-from-the-bellezma-batna-range-algeria-an-index-species-for-the-middle-cenomanian" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/87330.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">175</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">32</span> Sclerobiont Assemblages on Macro-Invertebrates from the Cenomanian Strata of Djebel Bouarif (Aurès Range, Algeria)</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Salmi-laouar%20Sihem">Salmi-laouar Sihem</a>, <a href="https://publications.waset.org/abstracts/search?q=Kara%20Ahmed%20Imad"> Kara Ahmed Imad</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The ichnological study of the Djebel BouarifCenomaniandeposits(Northern Aurès Range, Algeria) revealed relatively abundant and diverse sclerobiont communities that are preserved in corals, bivalves, and gastropods ; all are described herein. Fossil traces are dominated by exceptionally preserved Gastrochaenolitesoften with tracemakers (bivalves), which are preserved in situ, Entobia, and Maeandropolydora. Other borings are rare and are represented by a single specimen of Rogerella, Nihilichnus, and Spirolites. Amongsclerozoans, encrustingjuvenile oysters, and non-oyster bivalves (Pseudolimea?granulata) are the mostabundant groups. Otherepibionts, such as gastropods and polychaetes (Glomerulaserpentina), are lesscommon; dwarfgastropods were located on a single oyster Costagyraolisiponensis, whereas Glomerula specimens were clustered on the lower and upper surfaces of coral Aspidiscuscristatus. Gastrochaenoliteswith original tracemakers and all the epibionts studied herein have not been described from the Djebel BouarifCenomaniandeposits to date. The rare occurrences of Spirolites and Nihilichnus are reported from Algeria for the first time. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=bioerosion" title="bioerosion">bioerosion</a>, <a href="https://publications.waset.org/abstracts/search?q=sclerobionts" title=" sclerobionts"> sclerobionts</a>, <a href="https://publications.waset.org/abstracts/search?q=upper%20creataceous" title=" upper creataceous"> upper creataceous</a>, <a href="https://publications.waset.org/abstracts/search?q=southern%20tethys" title=" southern tethys"> southern tethys</a>, <a href="https://publications.waset.org/abstracts/search?q=atlasic%20domain" title=" atlasic domain"> atlasic domain</a> </p> <a href="https://publications.waset.org/abstracts/156926/sclerobiont-assemblages-on-macro-invertebrates-from-the-cenomanian-strata-of-djebel-bouarif-aures-range-algeria" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/156926.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">108</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">31</span> Interaction of Non-Gray-Gas Radiation with Opposed Mixed Convection in a Lid-Driven Square Cavity </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohammed%20Cherifi">Mohammed Cherifi</a>, <a href="https://publications.waset.org/abstracts/search?q=Abderrahmane%20Benbrik"> Abderrahmane Benbrik</a>, <a href="https://publications.waset.org/abstracts/search?q=Siham%20Laouar-Meftah"> Siham Laouar-Meftah</a>, <a href="https://publications.waset.org/abstracts/search?q=Denis%20Lemonnier"> Denis Lemonnier</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The present study was conducted to numerically investigate the interaction of non-gray-gas radiation with opposed mixed convection in a vertical two-sided lid-driven square cavity. The opposing flows are simultaneously generated by the vertical boundary walls which slide at a constant speed and the natural convection due to the gradient temperature of differentially heated cavity. The horizontal walls are thermally insulated and perfectly reflective. The enclosure is filled with air-H2O-CO2 gas mixture, which is considered as a non-gray, absorbing, emitting and not scattering medium. The governing differential equations are solved by a ﬁnite-volume method, by adopting the SIMPLER algorithm for pressure–velocity coupling. The radiative transfer equation (RTE) is solved by the discrete ordinates method (DOM). The spectral line weighted sum of gray gases model (SLW) is used to account for non-gray radiation properties. Three cases of the effects of radiation (transparent, gray and non-gray medium) are studied. Comparison is also made with the parametric studies of the effect of the mixed convection parameter, Ri (0.1, 1, 10), on the fluid flow and heat transfer have been performed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=opposed%20mixed%20convection" title="opposed mixed convection">opposed mixed convection</a>, <a href="https://publications.waset.org/abstracts/search?q=non-gray-gas%20radiation" title=" non-gray-gas radiation"> non-gray-gas radiation</a>, <a href="https://publications.waset.org/abstracts/search?q=two-sided%20lid-driven%20cavity" title=" two-sided lid-driven cavity"> two-sided lid-driven cavity</a>, <a href="https://publications.waset.org/abstracts/search?q=discrete%20ordinate%20method" title=" discrete ordinate method"> discrete ordinate method</a>, <a href="https://publications.waset.org/abstracts/search?q=SLW%20model" title=" SLW model"> SLW model</a> </p> <a href="https://publications.waset.org/abstracts/45398/interaction-of-non-gray-gas-radiation-with-opposed-mixed-convection-in-a-lid-driven-square-cavity" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/45398.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">319</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">30</span> Performance Evaluation of DSR and OLSR Routing Protocols in MANET Using Varying Pause Time </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yassine%20Meraihi">Yassine Meraihi</a>, <a href="https://publications.waset.org/abstracts/search?q=Dalila%20Acheli"> Dalila Acheli</a>, <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Meraihi"> Rabah Meraihi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> MANET for Mobile Ad hoc NETwork is a collection of wireless mobile nodes that communicates with each other without using any existing infrastructure, access point or centralized administration, due to the higher mobility and limited radio transmission range, routing is an important issue in ad hoc network, so in order to ensure reliable and efficient route between to communicating nodes quickly, an appropriate routing protocol is needed. In this paper, we present the performance analysis of two mobile ad hoc network routing protocols namely DSR and OLSR using NS2.34, the performance is determined on the basis of packet delivery ratio, throughput, average jitter and end to end delay with varying pause time. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=DSR" title="DSR">DSR</a>, <a href="https://publications.waset.org/abstracts/search?q=OLSR" title=" OLSR"> OLSR</a>, <a href="https://publications.waset.org/abstracts/search?q=quality%20of%20service" title=" quality of service"> quality of service</a>, <a href="https://publications.waset.org/abstracts/search?q=routing%20protocols" title=" routing protocols"> routing protocols</a>, <a href="https://publications.waset.org/abstracts/search?q=MANET" title=" MANET"> MANET</a> </p> <a href="https://publications.waset.org/abstracts/19417/performance-evaluation-of-dsr-and-olsr-routing-protocols-in-manet-using-varying-pause-time" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/19417.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">552</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">29</span> Investigation of Zinc Corrosion in Tropical Soil Solution</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20Lebrini">M. Lebrini</a>, <a href="https://publications.waset.org/abstracts/search?q=L.%20Salhi"> L. Salhi</a>, <a href="https://publications.waset.org/abstracts/search?q=C.%20Deyrat"> C. Deyrat</a>, <a href="https://publications.waset.org/abstracts/search?q=C.%20Roos"> C. Roos</a>, <a href="https://publications.waset.org/abstracts/search?q=O.%20Nait-Rabah"> O. Nait-Rabah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The paper presents a large experimental study on the corrosion of zinc in tropical soil and in the ground water at the various depths. Through this study, the corrosion rate prediction was done on the basis of two methods the electrochemical method and the gravimetric. The electrochemical results showed that the corrosion rate is more important at the depth levels 0 m to 0.5 m and 0.5 m to 1 m and beyond these depth levels, the corrosion rate is less important. The electrochemical results indicated also that a passive layer is formed on the zinc surface. The found SEM and EDX micrographs displayed that the surface is extremely attacked and confirmed that a zinc oxide layer is present on the surface whose thickness and relief increase as the contact with soil increases. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=soil%20corrosion" title="soil corrosion">soil corrosion</a>, <a href="https://publications.waset.org/abstracts/search?q=galvanized%20steel" title=" galvanized steel"> galvanized steel</a>, <a href="https://publications.waset.org/abstracts/search?q=electrochemical%20technique" title=" electrochemical technique"> electrochemical technique</a>, <a href="https://publications.waset.org/abstracts/search?q=SEM%20and%20EDX" title=" SEM and EDX"> SEM and EDX</a> </p> <a href="https://publications.waset.org/abstracts/153148/investigation-of-zinc-corrosion-in-tropical-soil-solution" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/153148.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">128</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">28</span> Effect of Mineral Additives on Improving the Geotechnical Properties of Soils in Chief</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Younes">Rabah Younes</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The reduction of available land resources and the increased cout associated with the use of high quality materials have led to the need for local soils to be used in geotechnical construction, however; poor engineering properties of these soils pose difficulties for constructions project and need to be stabilized to improve their properties in other works unsuitable soils with low bearing capacity , high plasticity coupled with high instability are frequently encountered hence, there is a need to improve the physical and mechanical characteristics of these soils to make theme more suitable for construction this can be done by using different mechanical and chemical methods clayey soil stabilization has been practiced for sometime but mixing additives, such us cement, lime and fly ash to the soil to increase its strength. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=clay" title="clay">clay</a>, <a href="https://publications.waset.org/abstracts/search?q=soil%20stabilization" title=" soil stabilization"> soil stabilization</a>, <a href="https://publications.waset.org/abstracts/search?q=naturaln%20pozzolana" title=" naturaln pozzolana"> naturaln pozzolana</a>, <a href="https://publications.waset.org/abstracts/search?q=atterberg%20limits" title=" atterberg limits"> atterberg limits</a>, <a href="https://publications.waset.org/abstracts/search?q=compaction" title=" compaction"> compaction</a>, <a href="https://publications.waset.org/abstracts/search?q=compressive%20strength%20shear%20strength" title="compressive strength shear strength">compressive strength shear strength</a>, <a href="https://publications.waset.org/abstracts/search?q=curing" title=" curing"> curing</a> </p> <a href="https://publications.waset.org/abstracts/28009/effect-of-mineral-additives-on-improving-the-geotechnical-properties-of-soils-in-chief" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/28009.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">313</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">27</span> Mathematical Modeling of a Sub-Wet Bulb Temperature Evaporative Cooling Using Porous Ceramic Materials</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Meryem%20Kanzari">Meryem Kanzari</a>, <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Boukhanouf"> Rabah Boukhanouf</a>, <a href="https://publications.waset.org/abstracts/search?q=Hatem%20G.%20Ibrahim"> Hatem G. Ibrahim</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Indirect Evaporative Cooling process has the advantage of supplying cool air at constant moisture content. However, such system can only supply air at temperatures above wet bulb temperature. This paper presents a mathematical model for a sub-wet bulb temperature indirect evaporative cooling arrangement that can overcome this limitation and supply cool air at temperatures approaching dew point and without increasing its moisture content. In addition, the use of porous ceramics as wet media materials offers the advantage of integration into building elements. Results of the computer show that the proposed design is capable of cooling air to temperatures lower than the ambient wet bulb temperature and achieving wet bulb effectiveness of about 1.17. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=indirect%20evaporative%20cooling" title="indirect evaporative cooling">indirect evaporative cooling</a>, <a href="https://publications.waset.org/abstracts/search?q=porous%20ceramic" title=" porous ceramic"> porous ceramic</a>, <a href="https://publications.waset.org/abstracts/search?q=sub-wet%20bulb%20temperature" title=" sub-wet bulb temperature"> sub-wet bulb temperature</a>, <a href="https://publications.waset.org/abstracts/search?q=mathematical%20modeling" title=" mathematical modeling"> mathematical modeling</a> </p> <a href="https://publications.waset.org/abstracts/1790/mathematical-modeling-of-a-sub-wet-bulb-temperature-evaporative-cooling-using-porous-ceramic-materials" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/1790.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">295</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">26</span> Preserving Digital Arabic Text Integrity Using Blockchain Technology</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Zineb%20Touati%20Hamad">Zineb Touati Hamad</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Ridda%20Laouar"> Mohamed Ridda Laouar</a>, <a href="https://publications.waset.org/abstracts/search?q=Issam%20Bendib"> Issam Bendib</a> </p> <p class="card-text"><strong>Abstract:</strong></p> With the massive development of technology today, the Arabic language has gained a prominent position among the languages most used for writing articles, expressing opinions, and also for citing in many websites, defying its growing sensitivity in terms of structure, language skills, diacritics, writing methods, etc. In the context of the spread of the Arabic language, the Holy Quran represents the most prevalent Arabic text today in many applications and websites for citation purposes or for the reading and learning rituals. The Quranic verses / surahs are published quickly and without cost, which may cause great concern to ensure the safety of the content from tampering and alteration. To protect the content of texts from distortion, it is necessary to refer to the original database and conduct a comparison process to extract the percentage of distortion. The disadvantage of this method is that it takes time, in addition to the lack of any guarantee on the integrity of the database itself as it belongs to one central party. Blockchain technology today represents the best way to maintain immutable content. Blockchain is a distributed database that stores information in blocks linked to each other through encryption, where the modification of each block can be easily known. To exploit these advantages, we seek in this paper to justify the use of this technique in preserving the integrity of Arabic texts sensitive to change by building a decentralized framework to authenticate and verify the integrity of the digital Quranic verses/surahs spread on websites. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=arabic%20text" title="arabic text">arabic text</a>, <a href="https://publications.waset.org/abstracts/search?q=authentication" title=" authentication"> authentication</a>, <a href="https://publications.waset.org/abstracts/search?q=blockchain" title=" blockchain"> blockchain</a>, <a href="https://publications.waset.org/abstracts/search?q=integrity" title=" integrity"> integrity</a>, <a href="https://publications.waset.org/abstracts/search?q=quran" title=" quran"> quran</a>, <a href="https://publications.waset.org/abstracts/search?q=verification" title=" verification"> verification</a> </p> <a href="https://publications.waset.org/abstracts/143009/preserving-digital-arabic-text-integrity-using-blockchain-technology" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/143009.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">164</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">25</span> Effect of Mesh Size on the Supersonic Viscous Flow Parameters around an Axisymmetric Blunt Body</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Haoui%20Rabah">Haoui Rabah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The aim of this work is to analyze a viscous flow around the axisymmetric blunt body taken into account the mesh size both in the free stream and into the boundary layer. The resolution of the Navier-Stokes equations is realized by using the finite volume method to determine the flow parameters and detached shock position. The numerical technique uses the Flux Vector Splitting method of Van Leer. Here, adequate time stepping parameter, CFL coefficient and mesh size level are selected to ensure numerical convergence. The effect of the mesh size is significant on the shear stress and velocity profile. The best solution is obtained with using a very fine grid. This study enabled us to confirm that the determination of boundary layer thickness can be obtained only if the size of the mesh is lower than a certain value limits given by our calculations. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=supersonic%20flow" title="supersonic flow">supersonic flow</a>, <a href="https://publications.waset.org/abstracts/search?q=viscous%20flow" title=" viscous flow"> viscous flow</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20volume" title=" finite volume"> finite volume</a>, <a href="https://publications.waset.org/abstracts/search?q=blunt%20body" title=" blunt body"> blunt body</a> </p> <a href="https://publications.waset.org/abstracts/11486/effect-of-mesh-size-on-the-supersonic-viscous-flow-parameters-around-an-axisymmetric-blunt-body" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/11486.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">604</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">24</span> Hepatitis B Virus Infection Among Egyptian Children Vaccinated during Infancy</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Iman%20I.%20Salama">Iman I. Salama</a>, <a href="https://publications.waset.org/abstracts/search?q=Samia%20M.%20Sami"> Samia M. Sami</a>, <a href="https://publications.waset.org/abstracts/search?q=Somaia%20I.%20Salama"> Somaia I. Salama</a>, <a href="https://publications.waset.org/abstracts/search?q=Zeinab%20N.%20Said"> Zeinab N. Said</a>, <a href="https://publications.waset.org/abstracts/search?q=Thanaa%20M.%20Rabah"> Thanaa M. Rabah</a>, <a href="https://publications.waset.org/abstracts/search?q=Aida%20M.%20Abdel-Mohsin"> Aida M. Abdel-Mohsin</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This is a national community-based project to evaluate the effectiveness of HBV vaccination program in prevention of infection. HBV markers were tested in the sera of 3600 vaccinated children. Infected children were followed up for 1 year. Prevalence of HBV infection was 0.39 % (0.28% positive for anti-HBc, 0.03% positive for HBsAg and 0.08% positive for both). One year later, 50% of positive anti-HBc children turned negative with sustained positivity for positive HBsAg cases. HBV infection was significantly higher at age above 9 years (0.6%) compared to 0.2% at age 3-9 years and 0% at younger age (P < 0.05). Logistic analysis revealed that predictors for HBV infection were history of blood transfusion, regular medical injection, and family history of either HBV infection or drug abuse (adjusted odds ratios 6.2, 5.6, 7.6 & 19.1 respectively). HBV vaccination program produced adequate protection. Adherence to infection control measures and safe blood transfusion are recommended. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=HBV%20infection" title="HBV infection">HBV infection</a>, <a href="https://publications.waset.org/abstracts/search?q=HBV%20vaccine" title=" HBV vaccine"> HBV vaccine</a>, <a href="https://publications.waset.org/abstracts/search?q=children" title=" children"> children</a>, <a href="https://publications.waset.org/abstracts/search?q=Egypt" title=" Egypt"> Egypt</a> </p> <a href="https://publications.waset.org/abstracts/2352/hepatitis-b-virus-infection-among-egyptian-children-vaccinated-during-infancy" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/2352.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">444</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">23</span> Chemical and Vibrational Nonequilibrium Hypersonic Viscous Flow around an Axisymmetric Blunt Body</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Haoui">Rabah Haoui</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Hypersonic flows around spatial vehicles during their reentry phase in planetary atmospheres are characterized by intense aerothermodynamics phenomena. The aim of this work is to analyze high temperature flows around an axisymmetric blunt body taking into account chemical and vibrational non-equilibrium for air mixture species and the no slip condition at the wall. For this purpose, the Navier-Stokes equations system is resolved by the finite volume methodology to determine the flow parameters around the axisymmetric blunt body especially at the stagnation point and in the boundary layer along the wall of the blunt body. The code allows the capture of shock wave before a blunt body placed in hypersonic free stream. The numerical technique uses the Flux Vector Splitting method of Van Leer. CFL coefficient and mesh size level are selected to ensure the numerical convergence. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=hypersonic%20flow" title="hypersonic flow">hypersonic flow</a>, <a href="https://publications.waset.org/abstracts/search?q=viscous%20flow" title=" viscous flow"> viscous flow</a>, <a href="https://publications.waset.org/abstracts/search?q=chemical%20kinetic" title=" chemical kinetic"> chemical kinetic</a>, <a href="https://publications.waset.org/abstracts/search?q=dissociation" title=" dissociation"> dissociation</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20volumes" title=" finite volumes"> finite volumes</a>, <a href="https://publications.waset.org/abstracts/search?q=frozen%20and%20non-equilibrium%20flow" title=" frozen and non-equilibrium flow"> frozen and non-equilibrium flow</a> </p> <a href="https://publications.waset.org/abstracts/26994/chemical-and-vibrational-nonequilibrium-hypersonic-viscous-flow-around-an-axisymmetric-blunt-body" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/26994.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">465</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">22</span> Development of Generalized Correlation for Liquid Thermal Conductivity of N-Alkane and Olefin</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20Ishag%20Mohamed">A. Ishag Mohamed</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20A.%20Rabah"> A. A. Rabah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The objective of this research is to develop a generalized correlation for the prediction of thermal conductivity of n-Alkanes and Alkenes. There is a minority of research and lack of correlation for thermal conductivity of liquids in the open literature. The available experimental data are collected covering the groups of n-Alkanes and Alkenes.The data were assumed to correlate to temperature using Filippov correlation. Nonparametric regression of Grace Algorithm was used to develop the generalized correlation model. A spread sheet program based on Microsoft Excel was used to plot and calculate the value of the coefficients. The results obtained were compared with the data that found in Perry's Chemical Engineering Hand Book. The experimental data correlated to the temperature ranged "between" 273.15 to 673.15 K, with R2 = 0.99.The developed correlation reproduced experimental data that which were not included in regression with absolute average percent deviation (AAPD) of less than 7 %. Thus the spread sheet was quite accurate which produces reliable data. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=N-Alkanes" title="N-Alkanes">N-Alkanes</a>, <a href="https://publications.waset.org/abstracts/search?q=N-Alkenes" title=" N-Alkenes"> N-Alkenes</a>, <a href="https://publications.waset.org/abstracts/search?q=nonparametric" title=" nonparametric"> nonparametric</a>, <a href="https://publications.waset.org/abstracts/search?q=regression" title=" regression"> regression</a> </p> <a href="https://publications.waset.org/abstracts/27797/development-of-generalized-correlation-for-liquid-thermal-conductivity-of-n-alkane-and-olefin" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/27797.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">654</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">21</span> Impact of Node Density and Transmission Range on the Performance of OLSR and DSDV Routing Protocols in VANET City Scenarios</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Yassine%20Meraihi">Yassine Meraihi</a>, <a href="https://publications.waset.org/abstracts/search?q=Dalila%20Acheli"> Dalila Acheli</a>, <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Meraihi"> Rabah Meraihi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Vehicular Ad hoc Network (VANET) is a special case of Mobile Ad hoc Network (MANET) used to establish communications and exchange information among nearby vehicles and between vehicles and nearby fixed infrastructure. VANET is seen as a promising technology used to provide safety, efficiency, assistance and comfort to the road users. Routing is an important issue in Vehicular Ad Hoc Network to find and maintain communication between vehicles due to the highly dynamic topology, frequently disconnected network and mobility constraints. This paper evaluates the performance of two most popular proactive routing protocols OLSR and DSDV in real city traffic scenario on the basis of three metrics namely Packet delivery ratio, throughput and average end to end delay by varying vehicles density and transmission range. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=DSDV" title="DSDV">DSDV</a>, <a href="https://publications.waset.org/abstracts/search?q=OLSR" title=" OLSR"> OLSR</a>, <a href="https://publications.waset.org/abstracts/search?q=quality%20of%20service" title=" quality of service"> quality of service</a>, <a href="https://publications.waset.org/abstracts/search?q=routing%20protocols" title=" routing protocols"> routing protocols</a>, <a href="https://publications.waset.org/abstracts/search?q=VANET" title=" VANET"> VANET</a> </p> <a href="https://publications.waset.org/abstracts/11262/impact-of-node-density-and-transmission-range-on-the-performance-of-olsr-and-dsdv-routing-protocols-in-vanet-city-scenarios" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/11262.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">471</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">20</span> Magnetoelectric Effect in Polyvinylidene Fluoride Beta Phase Thin Films</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Belouadah%20Rabah">Belouadah Rabah</a>, <a href="https://publications.waset.org/abstracts/search?q=Guyomar%20Daneil"> Guyomar Daneil</a>, <a href="https://publications.waset.org/abstracts/search?q=Guiffard%20Benoit"> Guiffard Benoit</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The magnetoelectric (ME) materials has dielectric polarization induced by the magnetic field or induced magnetization under an electric field. A strong ME effect requires the simultaneous presence of magnetic moments and electric dipoles. In the last decades, extensive research has been conducted on the ME effect in single phase and composite materials. This article reported the results obtained with two samples, the first is mono layer of PVDF bi-stretched and the second is the multi layer PVDF bi-stretched with the Polyurethane filled with micro particles magnetic Fe3O4 (PU+2% Fe3O4). Compare with non ME material like Alumine, a large ME polarization coefficient for the two samples was obtained. The piezoelectric properties of the PVDF and elastic proprieties of Pu+2% Fe3O4 give a big linear ME coefficient of the multi layer PVDF/(Pu+2% Fe3O4) than in the monolayer of PVDF. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=magnetoelectric%20effect" title="magnetoelectric effect">magnetoelectric effect</a>, <a href="https://publications.waset.org/abstracts/search?q=polymers" title=" polymers"> polymers</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetic%20particles" title=" magnetic particles"> magnetic particles</a>, <a href="https://publications.waset.org/abstracts/search?q=composites" title=" composites"> composites</a>, <a href="https://publications.waset.org/abstracts/search?q=films" title=" films"> films</a> </p> <a href="https://publications.waset.org/abstracts/13778/magnetoelectric-effect-in-polyvinylidene-fluoride-beta-phase-thin-films" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13778.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">395</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">19</span> Optical and Magnetic Properties of Ferromagnetic Co-Ni Co-Doped TiO2 Thin Films</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Bensaha">Rabah Bensaha</a>, <a href="https://publications.waset.org/abstracts/search?q=Badreddine%20Toubal"> Badreddine Toubal</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We investigate the structural, optical and magnetic properties of TiO2, Co-doped TiO2, Ni-doped TiO2 and Co-Ni co-doped TiO2 thin films prepared by the sol-gel dip coating method. Fully anatase phase was obtained by adding metal ions without any detectable impurity phase or oxide formed. AFM and SEM micrographs clearly confirm that the addition of Co-Ni affects the shape of anatase nanoparticles. The crystallite sizes and surface roughness of TiO2 films increase with Co-doping, Ni-doping and Co–Ni co-doping, respectively. The refractive index, thickness and optical band gap values of the films were obtained by means of optical transmittance spectra measurements. The band gap of TiO2 sample was decreased by Co-doping, Ni-doping and Co–Ni co-doping TiO2 films. Both undoped and Co-Ni co-doped films were found to be ferromagnetic at room temperature may due to the presence of oxygen vacancy defect and the probable formation of metal clusters Co-Ni. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Co-Ni%20co-doped" title="Co-Ni co-doped">Co-Ni co-doped</a>, <a href="https://publications.waset.org/abstracts/search?q=anatase%20TiO2" title=" anatase TiO2"> anatase TiO2</a>, <a href="https://publications.waset.org/abstracts/search?q=ferromagnetic" title=" ferromagnetic"> ferromagnetic</a>, <a href="https://publications.waset.org/abstracts/search?q=sol-gel%20method" title=" sol-gel method"> sol-gel method</a>, <a href="https://publications.waset.org/abstracts/search?q=thin%20films" title=" thin films"> thin films</a> </p> <a href="https://publications.waset.org/abstracts/35968/optical-and-magnetic-properties-of-ferromagnetic-co-ni-co-doped-tio2-thin-films" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/35968.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">444</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">18</span> Packet Fragmentation Caused by Encryption and Using It as a Security Method</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Said%20Rabah%20Azzam">Said Rabah Azzam</a>, <a href="https://publications.waset.org/abstracts/search?q=Andrew%20Graham"> Andrew Graham</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Fragmentation of packets caused by encryption applied on the network layer of the IOS model in Internet Protocol version 4 (IPv4) networks as well as the possibility of using fragmentation and Access Control Lists (ACLs) as a method of restricting network access to certain hosts or areas of a network.Using default settings, fragmentation is expected to occur and each fragment to be reassembled at the other end. If this does not occur then a high number of ICMP messages should be generated back towards the source host indicating that the packet is too large and that it needs to be made smaller. This result is also expected when the MTU is changed for certain links between devices.When using ACLs and packet fragments to restrict access to hosts or network segments it is possible that ACLs cannot be set up in this way. If ACLs cannot be setup to allow only fragments then it is a limitation of the hardware’s firmware holding back this particular method. If the ACL on the restricted switch can be set up in such a way to allow only fragments then a connection that forces packets to fragment should be allowed to pass through the ACL. This should then make a network connection to the destination machine allowing data to be sent to and from the destination machine. ICMP messages from the restricted access switch and host should also be blocked from being sent back across the link which will be shown in an SSH session into the switch. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=fragmentation" title="fragmentation">fragmentation</a>, <a href="https://publications.waset.org/abstracts/search?q=encryption" title=" encryption"> encryption</a>, <a href="https://publications.waset.org/abstracts/search?q=security" title=" security"> security</a>, <a href="https://publications.waset.org/abstracts/search?q=switch" title=" switch "> switch </a> </p> <a href="https://publications.waset.org/abstracts/30056/packet-fragmentation-caused-by-encryption-and-using-it-as-a-security-method" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/30056.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">336</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">17</span> Effects of Copper and Cobalt Co-Doping on Structural, Optical and Electrical Properties of Tio2 Thin Films Prepared by Sol Gel Method</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Bensaha">Rabah Bensaha</a>, <a href="https://publications.waset.org/abstracts/search?q=Badreeddine%20Toubal"> Badreeddine Toubal</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Un-doped TiO2, Co single doped TiO2 and (Cu-Co) co-doped TiO2 thin films have been growth on silicon substrates by the sol-gel dip coating technique. We mainly investigated both effects of the dopants and annealing temperature on the structural, optical and electrical properties of TiO2 films using X-ray diffraction (XRD), Raman and FTIR spectroscopy, Atomic force microscopy (AFM), Scanning electron microscopy (SEM), UV–Vis spectroscopy. The chemical compositions of Co-doped and (Cu-Co) co-doped TiO2 films were confirmed by XRD, Raman and FTIR studies. The average grain sizes of CoTiO3-TiO2 nanocomposites were increased with annealing temperature. AFM and SEM reveal a completely the various nanostructures of CoTiO3-TiO2 nanocomposites thin films. The ﬁlms exhibit a high optical reflectance with a large band gap. The highest electrical conductivity was obtained for the (Cu-Co) co-doped TiO2 films. The polyhedral surface morphology might possibly improve the surface contact between particle sizes and then contribute to better electron mobility as well as conductivity. The obtained results suggest that the prepared TiO2 films can be used for optoelectronic applications. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=sol-gel" title="sol-gel">sol-gel</a>, <a href="https://publications.waset.org/abstracts/search?q=TiO2%20thin%20films" title=" TiO2 thin films"> TiO2 thin films</a>, <a href="https://publications.waset.org/abstracts/search?q=CoTiO3-TiO2%20nanocomposites%20films" title=" CoTiO3-TiO2 nanocomposites films"> CoTiO3-TiO2 nanocomposites films</a>, <a href="https://publications.waset.org/abstracts/search?q=Electrical%20conductivity" title=" Electrical conductivity"> Electrical conductivity</a> </p> <a href="https://publications.waset.org/abstracts/36032/effects-of-copper-and-cobalt-co-doping-on-structural-optical-and-electrical-properties-of-tio2-thin-films-prepared-by-sol-gel-method" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/36032.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">442</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">16</span> Optimization of Syngas Quality for Fischer-Tropsch Synthesis</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ali%20Rabah">Ali Rabah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This research received no grant or financial support from any public, commercial, or none governmental agency. The author conducted this work as part of his normal research activities as a professor of Chemical Engineering at the University of Khartoum, Sudan. Abstract While fossil oil reserves have been receding, the demand for diesel and gasoline has been growing. In recent years, syngas of biomass origin has been emerging as a viable feedstock for Fischer-Tropsch (FT) synthesis, a process for manufacturing synthetic gasoline and diesel. This paper reports the optimization of syngas quality to match FT synthesis requirements. The optimization model maximizes the thermal efficiency under the constraint of H2/CO≥2.0 and operating conditions of equivalent ratio (0 ≤ ER ≤ 1.0), steam to biomass ratio (0 ≤ SB ≤ 5), and gasification temperature (500 °C ≤ Tg ≤ 1300 °C). The optimization model is executed using the optimization section of the Model Analysis Tools of the Aspen Plus simulator. The model is tested using eleven (11) types of MSW. The optimum operating conditions under which the objective function and the constraint are satisfied are ER=0, SB=0.66-1.22, and Tg=679 - 763°C. Under the optimum operating conditions, the syngas quality is H2=52.38 - 58.67-mole percent, LHV=12.55 - 17.15 MJ/kg, N2=0.38 - 2.33-mole percent, and H2/CO≥2.15. The generalized optimization model reported could be extended to any other type of biomass and coal. Keywords: MSW, Syngas, Optimization, Fischer-Tropsch. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=syngas" title="syngas">syngas</a>, <a href="https://publications.waset.org/abstracts/search?q=MSW" title=" MSW"> MSW</a>, <a href="https://publications.waset.org/abstracts/search?q=optimization" title=" optimization"> optimization</a>, <a href="https://publications.waset.org/abstracts/search?q=Fisher-Tropsh" title=" Fisher-Tropsh"> Fisher-Tropsh</a> </p> <a href="https://publications.waset.org/abstracts/160662/optimization-of-syngas-quality-for-fischer-tropsch-synthesis" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/160662.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">80</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">15</span> Theoretical Method for Full Ab-Initio Calculation of Rhenium Carbide Compound</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=D.Rached">D.Rached</a>, <a href="https://publications.waset.org/abstracts/search?q=M.Rabah"> M.Rabah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> First principles calculations are carried out to investigate the structural, electronic, and elastic properties of the utraincompressible materials, namely, noble metal carbide of Rhenium carbide (ReC) in four phases, the rocksalt (NaCl-B1), zinc blende (ZB-B2), the tungsten carbide(Bh) (WC), and the nickel arsenide (NiAs-B8).The ground state properties such as the equilibrium lattice constant, elastic constants, the bulk modulus its pressure derivate, and the hardness of ReC in these phases are systematically predicted by calculations from first–principles. The corresponding calculated bulk modulus is comparable with that of diamond, especially for the B8 –type rhenium carbide (ReC), the incompressibility along the c axis is demonstrated to exceed the linear incompressibility of diamond. Our calculations confirm in the nickel arsenide (B8) structure the ReC is found to be stable with a large bulk modulus B=440 GPa and the tungsten carbide (WC) structure becomes the most more favourable with to respect B3 and B1 structures, which ReC- WC is meta-stable. Furthermore, the highest bulk modulus values in the zinc blende (B3), rock salt (B1), tungsten carbide (WC), and the nickel arsenide (B8) structures (294GPa, 401GPa, 415GPa and 447 GPa, respectively) indicates that ReC is a hard material, and is superhard compound H(B8)= 36 GPa compared with the H(diamond)=96 GPa and H(c BN)=63.10 GPa. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=DFT" title="DFT">DFT</a>, <a href="https://publications.waset.org/abstracts/search?q=FP-LMTO" title=" FP-LMTO"> FP-LMTO</a>, <a href="https://publications.waset.org/abstracts/search?q=mechanical%20properties" title=" mechanical properties"> mechanical properties</a>, <a href="https://publications.waset.org/abstracts/search?q=elasticity" title=" elasticity"> elasticity</a>, <a href="https://publications.waset.org/abstracts/search?q=high%20pressure" title=" high pressure"> high pressure</a>, <a href="https://publications.waset.org/abstracts/search?q=thermodynamic%20properties" title=" thermodynamic properties"> thermodynamic properties</a>, <a href="https://publications.waset.org/abstracts/search?q=hard%20material" title=" hard material"> hard material</a> </p> <a href="https://publications.waset.org/abstracts/13995/theoretical-method-for-full-ab-initio-calculation-of-rhenium-carbide-compound" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13995.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">441</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">14</span> Pore Pressure and In-situ Stress Magnitudes with Image Log Processing and Geological Interpretation in the Haoud Berkaoui Hydrocarbon Field, Northeastern Algerian Sahara</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rafik%20Baouche">Rafik Baouche</a>, <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Chaouchi"> Rabah Chaouchi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work reports the first comprehensive stress field interpretation from the eleven recently drilled wells in the Berkaoui Basin, Algerian Sahara. A cumulative length of 7000+m acoustic image logs from 06 vertical wells were investigated, and a mean NW-SE (128°-145° N) maximum horizontal stress (SHMax) orientation is inferred from the B-D quality wellbore breakouts. The study integrates log-based approach with the downhole measurements to infer pore pressure, in-situ stress magnitudes. Vertical stress (Sv), interpreted from the bulk-density profiles, has an average gradient of 22.36 MPa/km. The Ordovician and Cambrian reservoirs have a pore pressure gradient of 13.47-13.77 MPa/km, which is more than the hydrostatic pressure regime. A 17.2-18.3 MPa/km gradient of minimum horizontal stress (Shmin) is inferred from the fracture closure pressure in the reservoirs. Breakout widths constrained the SHMax magnitude in the 23.8-26.5 MPa/km range. Subsurface stress distribution in the central Saharan Algeria indicates that the present-day stress field in the Berkaoui Basin is principally strike-slip faulting (SHMax > Sv > Shmin). Inferences are drawn on the regional stress pattern and drilling and reservoir development. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=stress" title="stress">stress</a>, <a href="https://publications.waset.org/abstracts/search?q=imagery" title=" imagery"> imagery</a>, <a href="https://publications.waset.org/abstracts/search?q=breakouts" title=" breakouts"> breakouts</a>, <a href="https://publications.waset.org/abstracts/search?q=sahara" title=" sahara"> sahara</a> </p> <a href="https://publications.waset.org/abstracts/164864/pore-pressure-and-in-situ-stress-magnitudes-with-image-log-processing-and-geological-interpretation-in-the-haoud-berkaoui-hydrocarbon-field-northeastern-algerian-sahara" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/164864.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">75</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">13</span> Flashover Voltage of Silicone Insulating Surface Covered by Water Drops under AC Voltage</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Fatiha%20Aouabed">Fatiha Aouabed</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdelhafid%20Bayadi"> Abdelhafid Bayadi</a>, <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Boudissa"> Rabah Boudissa</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Nowadays, silicone rubber insulation materials are widely used in high voltage outdoor insulation systems as they can combat pollution flashover problems. The difference in pollution flashover performance of silicone rubber and other insulating materials is due to the way that water wets their surfaces. It resides as discrete drops on silicone rubber, and the mechanism of flashover is due to the breakdown of the air between the water drops and the distortion of these drops in the direction of the electric field which brings the insulation to degradation and failure. The main objective of this work is to quantify the effect of different types of water drops arrangements, their position and dry bands width on the flashover voltage of the silicone insulating surface with non-uniform electric field systems. The tests were carried out on a rectangular sample under AC voltage. A rod-rod electrode system is used. The findings of this work indicate that the performance of the samples decreases with the presence of water drops on their surfaces. Further, these experimental findings show that there is a limiting number of rows from which the flashover voltage of the insulation is minimal and constant. This minimum is a function of the distance between two successive rows. Finally, it is concluded that the system withstand voltage increases when the row of droplets on the electrode axis is removed. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=contamination" title="contamination">contamination</a>, <a href="https://publications.waset.org/abstracts/search?q=flashover" title=" flashover"> flashover</a>, <a href="https://publications.waset.org/abstracts/search?q=testing" title=" testing"> testing</a>, <a href="https://publications.waset.org/abstracts/search?q=silicone%20rubber%20insulators" title=" silicone rubber insulators"> silicone rubber insulators</a>, <a href="https://publications.waset.org/abstracts/search?q=surface%20wettability" title=" surface wettability"> surface wettability</a>, <a href="https://publications.waset.org/abstracts/search?q=water%20droplets" title=" water droplets"> water droplets</a> </p> <a href="https://publications.waset.org/abstracts/13301/flashover-voltage-of-silicone-insulating-surface-covered-by-water-drops-under-ac-voltage" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13301.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">442</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">12</span> Impact of Hepatitis C Virus Chronic Infection on Quality of Life in Egypt</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ammal%20M.%20Metwally">Ammal M. Metwally</a>, <a href="https://publications.waset.org/abstracts/search?q=Ghada%20A.%20Abdel-Latif"> Ghada A. Abdel-Latif</a>, <a href="https://publications.waset.org/abstracts/search?q=Walaa%20A.%20Fouad"> Walaa A. Fouad</a>, <a href="https://publications.waset.org/abstracts/search?q=Thanaa%20M.%20Rabah"> Thanaa M. Rabah</a>, <a href="https://publications.waset.org/abstracts/search?q=Amira%20Mohsen"> Amira Mohsen</a>, <a href="https://publications.waset.org/abstracts/search?q=Fatma%20A.%20Shaaban"> Fatma A. Shaaban</a>, <a href="https://publications.waset.org/abstracts/search?q=Iman%20I.%20Salama">Iman I. Salama</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The study aimed at determining the impact of chronic hepatitis C virus (HCV) infection on patients’ Quality of Life (QoL) , its relation to geographical characteristics of patients, awareness of the disease, treatment regimen, co-morbid psychiatric or other diseases. 457 patients were randomly selected from ten National Treatment Reference Centers of Ministry of Health hospitals from four community locations representing Egypt. Health related QoL assessment questionnaire with the 36-item Short Form used for assessment of the enrolled patients. The study showed no significant difference between HCV patients in different governorates as regards total QoL. Females, illiterate patients and those had bilharziasis, diabetes mellitus, hypertension or were depressed had significantly the lowest QoL score. HCV patients who knew the danger of the disease had significant lower mean score of physical and mental health components. Optimal care of overall well-being of HCV patients requires adequate knowledge of their neurological and psychological status. It is important to know that any patient will need to take the time to know that his new physical limitations do not limit him as a person, as soul, no matter what other people are thinking as a positive hopeful attitude is essential for combating HCV. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=hepatitis%20C%20virus%20chronic%20infection%20-%20physical%20health%20component%20and%20mental%20health%20component%20of%20QoL%E2%80%93%20total%20quality%20of%20life" title="hepatitis C virus chronic infection - physical health component and mental health component of QoL– total quality of life">hepatitis C virus chronic infection - physical health component and mental health component of QoL– total quality of life</a> </p> <a href="https://publications.waset.org/abstracts/3583/impact-of-hepatitis-c-virus-chronic-infection-on-quality-of-life-in-egypt" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/3583.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">449</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">11</span> Effect of Geometry on the Aerodynamic Performance of Darrieus H Yype Vertical Axis Wind Turbine</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Belkheir%20Noura">Belkheir Noura</a>, <a href="https://publications.waset.org/abstracts/search?q=Rabah%20Kerfah"> Rabah Kerfah</a>, <a href="https://publications.waset.org/abstracts/search?q=Boumehani%20Abdellah"> Boumehani Abdellah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The influence of solidity variations on the aerodynamic performance of H type vertical axis wind turbine is studied in this paper. The wind turbine model used in this paper is the three-blade wind turbine with the symmetrical airfoil, NACA0021. The length of the chord is 0.265m. Numerical investigations were implemented for the different solidity by changing the radius and blade number. A two-dimensional model of the wind turbine is employed. The approach a Reynolds-Averaged Navier–Stokes equations, completed by the K- ώ SST turbulence model, is used. Motion mesh model capability of a computational fluid dynamics (CFD) solver is used. For each value of the solidity, the aerodynamics performances and the characteristics of the flow field are studied at several values of the tip speed ratio, λ = 0.5 to λ = 3, with an incoming wind speed of 8 m/s. The results show that increasing the number of blades will reduce the maximum value of the power coefficient of the wind turbine. Also, for the VAWT with a lower solidity can obtain the maximum Cp at a high tip speed ratio. The effects of changing the radius and blade number on aerodynamic performance are almost the same. Finally, for the validation, experimental data from the literature and computational results were compared. In conclusion, to study the influence of the solidity in the performances of the wind turbine is to provide the reference for the design of H type vertical axis wind turbines. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=wind%20energy" title="wind energy">wind energy</a>, <a href="https://publications.waset.org/abstracts/search?q=darrieus%20h%20type%20vertical%20axis%20wind%20turbine" title=" darrieus h type vertical axis wind turbine"> darrieus h type vertical axis wind turbine</a>, <a href="https://publications.waset.org/abstracts/search?q=computational%20fluid%20dynamic" title=" computational fluid dynamic"> computational fluid dynamic</a>, <a href="https://publications.waset.org/abstracts/search?q=solidity" title=" solidity"> solidity</a> </p> <a href="https://publications.waset.org/abstracts/164160/effect-of-geometry-on-the-aerodynamic-performance-of-darrieus-h-yype-vertical-axis-wind-turbine" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/164160.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">96</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">10</span> Preparation of Chromium Nanoparticles on Carbon Substrate from Tannery Waste Solution by Chemical Method Compared to Electrokinetic Process</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mahmoud%20A.%20Rabah">Mahmoud A. Rabah</a>, <a href="https://publications.waset.org/abstracts/search?q=Said%20El%20Sheikh"> Said El Sheikh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work shows the preparation of chromium nanoparticles from tannery waste solution on glassy carbon by chemical method compared to electrokinetic process. The waste solution contains free and soluble fats, calcium, iron, magnesium and high sodium in addition to the chromium ions. Filtration helps removal of insoluble matters. Diethyl ether successfully extracted soluble fats. The method started by removing calcium as insoluble oxalate salts at hot conditions in a faint acidic medium. The filtrate contains iron, magnesium, chromium ions and sodium chloride in excess. Chromium was separated selectively as insoluble hydroxide sol-gel at pH 6.5, filtered and washed with distilled water. Part of the gel reacted with sulfuric acid to produce chromium sulfate solution having 15-25 g/L concentration. Electrokinetic deposition of chromium nanoparticles on a carbon cathode was carried out using platinum anode under different galvanostatic conditions. The chemical method involved impregnating the carbon specimens with chromium hydroxide gel followed by reduction using hydrazine hydrate or by thermal reduction using hydrogen gas at 1250°C. Chromium grain size was characterized by TEM, FT-IR and SEM. Properties of the Cr grains were correlated to the conditions of the preparation process. Electrodeposition was found to control chromium particles to be more identical in size and shape as compared to the chemical method. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=chromium" title="chromium">chromium</a>, <a href="https://publications.waset.org/abstracts/search?q=electrodeposition" title=" electrodeposition"> electrodeposition</a>, <a href="https://publications.waset.org/abstracts/search?q=nanoparticles" title=" nanoparticles"> nanoparticles</a>, <a href="https://publications.waset.org/abstracts/search?q=tannery%20waste%20solution" title=" tannery waste solution"> tannery waste solution</a> </p> <a href="https://publications.waset.org/abstracts/6647/preparation-of-chromium-nanoparticles-on-carbon-substrate-from-tannery-waste-solution-by-chemical-method-compared-to-electrokinetic-process" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/6647.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">409</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">9</span> Ultrastructural Changes Occur in Mice Lungs After Cessation to Exposure of Incense Smoke</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samar%20Rabah">Samar Rabah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Background: Incense woods are special kind of trees called Agarwood, which characterized by good smelling odors and many medical benefits. Incense smoke is heavily used in Saudi Arabia although comprehensive studies of its effects on health are limited. The present study demonstrated lung ultrastructure changes of mice after exposure and cessation to Incense smoke. Eighty mice are divided equally into four groups, three groups are exposed to different concentrations of Incense smoke (2, 4 and 6 gm) for three months, while the fourth group is control one. At the end of each month, lungs of five animals from each group are gathered, while the last five animals from each group are kept for another 60 days without exposure to the Incense smoke to allow for recovery. Results: Transmission electron microscope investigations of all exposed groups showed hypertrophy and hyperplasia in Clara Cells and some an enlargement of the macrophage to the point that it fills a large part of the alveolar lumen. Scanning electron microscope marks presence of mucus materials attached to the epithelial bronchioles. After prevention of exposure to the Incense smoke for 60 days, necrosis and degeneration in some cells of epithelial bronchioles, fibrosis of peribronchial, thickening in alveolar walls and aggregation of lymphoid cells were demonstrated. Conclusion: Based on the above findings and other related studies (not published), we conclude that exposure to Incense smoke causes harmful effects due to sever changes in pulmonary ultrastructure, such effects do not disappear even when Incense smoke inhalation was stopped. Therefore, we recommend that Incense smoke should use only in open places to reduce its harms. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Incense%20smoke" title="Incense smoke">Incense smoke</a>, <a href="https://publications.waset.org/abstracts/search?q=lungs" title=" lungs"> lungs</a>, <a href="https://publications.waset.org/abstracts/search?q=ultrastructure%20of%20lungs" title=" ultrastructure of lungs"> ultrastructure of lungs</a>, <a href="https://publications.waset.org/abstracts/search?q=Agarwood" title=" Agarwood"> Agarwood</a> </p> <a href="https://publications.waset.org/abstracts/26850/ultrastructural-changes-occur-in-mice-lungs-after-cessation-to-exposure-of-incense-smoke" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/26850.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">413</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">8</span> Identification of Associated-Virulence Genes in Quinolone-Resistant Escherichia coli Strains Recovered from an Urban Wastewater Treatment Plant</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Alouache%20Souhila">Alouache Souhila</a>, <a href="https://publications.waset.org/abstracts/search?q=Messai%20Yamina"> Messai Yamina</a>, <a href="https://publications.waset.org/abstracts/search?q=Torres%20Carmen"> Torres Carmen</a>, <a href="https://publications.waset.org/abstracts/search?q=Bakour%20Rabah"> Bakour Rabah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Objective: It has often been reported an association between antibiotic resistance and virulence. However, resistance to quinolones seems to be an exception, it tends instead to be associated with an attenuation of virulence, particularly in clinical strains. The purpose of this study was to evaluate the potential virulence of 28 quinolone-resistant E. coli strains recovered from water at the inflow (n=16) and outflow (n=12) of an urban wastewater treatment plant (WWTP). Methods: E. coli isolates were selected on Tergitol-7 agar supplemented with 2µg/ml of ciprofloxacin, they were screened by PCR for 11 virulence genes related to Extraintestinal pathogenic E. coli (ExPEC): papC, papG, afa/draBC, sfa/foc, kpsMTII, iutA, iroN, hlyF, ompT, iss and traT. The phylogenetic groups were determined by PCR and clonal relationship was evaluated by ERIC-PCR. Results: Genotyping by ERIC-PCR showed 7 and 12 DNA profiles among strains of wastewater (inflow) and treated water (outflow), respectively. Strains were assigned to the following phylogenetic groups: B2 (n = 1, 3.5%), D (n = 3, 10.7%), B1 (n = 10, 35.7%.) and A (n = 14, 50%). A total of 8 virulence-associated genes were detected, traT (n=19, 67.8%), iroN (n= 16, 57 .1%), hlyF (n=15, 53 .5%), ompT (n=15, 53 .5%), iss (n=14, 50%), iutA (n=9, 32.1%) , sfa/foc (n=7, 25%) and kpsMTII (n=2, 7.1%). Combination of virulence factors allowed to define 16 virulence profiles. The pathotype APEC was observed in 17.8% (D=1, B1=4) and human ExPEC in 7% (B2=1, D=1) of strains. Conclusion: The study showed that quinolone-resistant E. coli strains isolated from wastewater and treated water in WWTP harbored virulence genes with the presence of APEC and human ExPEC strains. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=E.%20coli" title="E. coli">E. coli</a>, <a href="https://publications.waset.org/abstracts/search?q=quinolone-resistance" title=" quinolone-resistance"> quinolone-resistance</a>, <a href="https://publications.waset.org/abstracts/search?q=virulence" title=" virulence"> virulence</a>, <a href="https://publications.waset.org/abstracts/search?q=WWTP" title=" WWTP"> WWTP</a> </p> <a href="https://publications.waset.org/abstracts/27482/identification-of-associated-virulence-genes-in-quinolone-resistant-escherichia-coli-strains-recovered-from-an-urban-wastewater-treatment-plant" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/27482.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">465</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">7</span> Impact of Curvatures in the Dike Line on Wave Run-up and Wave Overtopping, ConDike-Project</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Malte%20Schilling">Malte Schilling</a>, <a href="https://publications.waset.org/abstracts/search?q=Mahmoud%20M.%20Rabah"> Mahmoud M. Rabah</a>, <a href="https://publications.waset.org/abstracts/search?q=Sven%20Liebisch"> Sven Liebisch</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Wave run-up and overtopping are the relevant parameters for the dimensioning of the crest height of dikes. Various experimental as well as numerical studies have investigated these parameters under different boundary conditions (e.g. wave conditions, structure type). Particularly for the dike design in Europe, a common approach is formulated where wave and structure properties are parameterized. However, this approach assumes equal run-up heights and overtopping discharges along the longitudinal axis. However, convex dikes have a heterogeneous crest by definition. Hence, local differences in a convex dike line are expected to cause wave-structure interactions different to a straight dike. This study aims to assess both run-up and overtopping at convexly curved dikes. To cast light on the relevance of curved dikes for the design approach mentioned above, physical model tests were conducted in a 3D wave basin of the Ludwig-Franzius-Institute Hannover. A dike of a slope of 1:6 (height over length) was tested under both regular waves and TMA wave spectra. Significant wave heights ranged from 7 to 10 cm and peak periods from 1.06 to 1.79 s. Both run-up and overtopping was assessed behind the curved and straight sections of the dike. Both measurements were compared to a dike with a straight line. It was observed that convex curvatures in the longitudinal dike line cause a redirection of incident waves leading to a concentration around the center point. Measurements prove that both run-up heights and overtopping rates are higher than on the straight dike. It can be concluded that deviations from a straight longitudinal dike line have an impact on design parameters and imply uncertainties within the design approach in force. Therefore, it is recommended to consider these influencing factors for such cases. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=convex%20dike" title="convex dike">convex dike</a>, <a href="https://publications.waset.org/abstracts/search?q=longitudinal%20curvature" title=" longitudinal curvature"> longitudinal curvature</a>, <a href="https://publications.waset.org/abstracts/search?q=overtopping" title=" overtopping"> overtopping</a>, <a href="https://publications.waset.org/abstracts/search?q=run-up" title=" run-up"> run-up</a> </p> <a href="https://publications.waset.org/abstracts/71860/impact-of-curvatures-in-the-dike-line-on-wave-run-up-and-wave-overtopping-condike-project" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/71860.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge 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