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Cherid</title> <meta name="description" content="Search results for: Samira Cherid"> <meta name="keywords" content="Samira Cherid"> <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="Samira Cherid"> <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> 103</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: Samira Cherid</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">103</span> Ballistic Transport in One-Dimensional Random Dimer Photonic Crystals </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samira%20Cherid">Samira Cherid</a>, <a href="https://publications.waset.org/abstracts/search?q=Samir%20Bentata"> Samir Bentata</a>, <a href="https://publications.waset.org/abstracts/search?q=F.%20Zahira%20Meghoufel"> F. Zahira Meghoufel</a>, <a href="https://publications.waset.org/abstracts/search?q=Sabria%20Terkhi"> Sabria Terkhi</a>, <a href="https://publications.waset.org/abstracts/search?q=Yamina%20Sefir"> Yamina Sefir</a>, <a href="https://publications.waset.org/abstracts/search?q=Fatima%20Bendahma"> Fatima Bendahma</a>, <a href="https://publications.waset.org/abstracts/search?q=Bouabdellah%20Bouadjemi"> Bouabdellah Bouadjemi</a>, <a href="https://publications.waset.org/abstracts/search?q=Ali%20Z.%20Itouni"> Ali Z. Itouni</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this work, we examined the propagation of light in one-dimensional systems is examined by means of the random dimer model. The introduction of defect elements, randomly in the studied system, breaks down the Anderson localization and provides a set of propagating delocalized modes at the corresponding conventional dimer resonances. However, tuning suitably the defect dimer resonance on the host ones (or vice versa), the transmission magnitudes can be enhanced providing the optimized ballistic transmission regime as an average response. Hence, ballistic optical filters can be conceived at desired wavelengths. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=photonic%20crystals" title="photonic crystals">photonic crystals</a>, <a href="https://publications.waset.org/abstracts/search?q=random%20dimer%20model" title=" random dimer model"> random dimer model</a>, <a href="https://publications.waset.org/abstracts/search?q=ballistic%20resonance" title=" ballistic resonance"> ballistic resonance</a>, <a href="https://publications.waset.org/abstracts/search?q=localization%20and%20transmission" title=" localization and transmission "> localization and transmission </a> </p> <a href="https://publications.waset.org/abstracts/33452/ballistic-transport-in-one-dimensional-random-dimer-photonic-crystals" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/33452.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">529</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">102</span> Study of Transport Phenomena in Photonic Crystals with Correlated Disorder</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samira%20Cherid">Samira Cherid</a>, <a href="https://publications.waset.org/abstracts/search?q=Samir%20Bentata"> Samir Bentata</a>, <a href="https://publications.waset.org/abstracts/search?q=Feyza%20Zahira%20Meghoufel"> Feyza Zahira Meghoufel</a>, <a href="https://publications.waset.org/abstracts/search?q=Yamina%20Sefir"> Yamina Sefir</a>, <a href="https://publications.waset.org/abstracts/search?q=Sabria%20Terkhi"> Sabria Terkhi</a>, <a href="https://publications.waset.org/abstracts/search?q=Fatima%20Bendahma"> Fatima Bendahma</a>, <a href="https://publications.waset.org/abstracts/search?q=Bouabdellah%20Bouadjemi"> Bouabdellah Bouadjemi</a>, <a href="https://publications.waset.org/abstracts/search?q=Ali%20%20Zitouni"> Ali Zitouni </a> </p> <p class="card-text"><strong>Abstract:</strong></p> Using the transfer-matrix technique and the Kronig Penney model, we numerically and analytically investigate the effect of short-range correlated disorder in random dimer model (RDM) on transmission properties of light in one dimension photonic crystals made of three different materials. Such systems consist of two different structures randomly distributed along the growth direction, with the additional constraint that one kind of these layers appears in pairs. It is shown that the one-dimensional random dimer photonic crystals support two types of extended modes. By shifting of the dimer resonance toward the host fundamental stationary resonance state, we demonstrate the existence of the ballistic response in these systems. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=photonic%20crystals" title="photonic crystals">photonic crystals</a>, <a href="https://publications.waset.org/abstracts/search?q=disorder" title=" disorder"> disorder</a>, <a href="https://publications.waset.org/abstracts/search?q=correlation" title=" correlation"> correlation</a>, <a href="https://publications.waset.org/abstracts/search?q=transmission" title=" transmission"> transmission</a> </p> <a href="https://publications.waset.org/abstracts/33369/study-of-transport-phenomena-in-photonic-crystals-with-correlated-disorder" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/33369.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">477</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">101</span> Effect of Spatially Correlated Disorder on Electronic Transport Properties of Aperiodic Superlattices (GaAs/AlxGa1-xAs)</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=F.%20Bendahma">F. Bendahma</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Bentata"> S. Bentata</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Cherid"> S. Cherid</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Zitouni"> A. Zitouni</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Terkhi"> S. Terkhi</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20Lantri"> T. Lantri</a>, <a href="https://publications.waset.org/abstracts/search?q=Y.%20Sefir"> Y. Sefir</a>, <a href="https://publications.waset.org/abstracts/search?q=Z.%20F.%20Meghoufel"> Z. F. Meghoufel</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We examine the electronic transport properties in Al<sub>x</sub>Ga<sub>1-x</sub>As/GaAs superlattices. Using the transfer-matrix technique and the exact Airy function formalism, we investigate theoretically the effect of structural parameters on the electronic energy spectra of trimer thickness barrier (TTB). Our numerical calculations showed that the localization length of the states becomes more extended when the disorder is correlated (trimer case). We have also found that the resonant tunneling time (RTT) is of the order of several femtoseconds. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=electronic%20transport%20properties" title="electronic transport properties">electronic transport properties</a>, <a href="https://publications.waset.org/abstracts/search?q=structural%20parameters" title=" structural parameters"> structural parameters</a>, <a href="https://publications.waset.org/abstracts/search?q=superlattices" title=" superlattices"> superlattices</a>, <a href="https://publications.waset.org/abstracts/search?q=transfer-matrix%20technique" title=" transfer-matrix technique"> transfer-matrix technique</a> </p> <a href="https://publications.waset.org/abstracts/53880/effect-of-spatially-correlated-disorder-on-electronic-transport-properties-of-aperiodic-superlattices-gaasalxga1-xas" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/53880.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">285</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">100</span> Structural, Electronic and Magnetic Properties of Co and Mn Doped CDTE</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.%20Zitouni">A. Zitouni</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Bentata"> S. Bentata</a>, <a href="https://publications.waset.org/abstracts/search?q=B.%20Bouadjemi"> B. Bouadjemi</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20Lantri"> T. Lantri</a>, <a href="https://publications.waset.org/abstracts/search?q=W.%20Benstaali"> W. Benstaali</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Zoubir"> A. Zoubir</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Cherid"> S. Cherid</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Sefir"> A. Sefir</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The structural, electronic, and magnetic properties of transition metal Co and Mn doped zinc-blende semiconductor CdTe were calculated using the density functional theory (DFT) with both generalized gradient approximation (GGA). We have analyzed the structural parameters, charge and spin densities, total and partial densities of states. We find that the Co and Mn doped zinc blende CdTe show half-metallic behavior with a total magnetic moment of 6.0 and 10.0 µB, respectively.The results obtained, make the Co and Mn doped CdTe a promising candidate for application in spintronics. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=first-principles" title="first-principles">first-principles</a>, <a href="https://publications.waset.org/abstracts/search?q=half-metallic" title=" half-metallic"> half-metallic</a>, <a href="https://publications.waset.org/abstracts/search?q=diluted%20magnetic%20semiconductor" title=" diluted magnetic semiconductor"> diluted magnetic semiconductor</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetic%20moment" title=" magnetic moment"> magnetic moment</a> </p> <a href="https://publications.waset.org/abstracts/33189/structural-electronic-and-magnetic-properties-of-co-and-mn-doped-cdte" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/33189.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">459</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">99</span> Half-Metallic Ferromagnetism in CdCoTe and CdMnTe: Ab-Initio Study</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.Zitouni">A.Zitouni</a>, <a href="https://publications.waset.org/abstracts/search?q=S.Bentata"> S.Bentata</a>, <a href="https://publications.waset.org/abstracts/search?q=B.Bouadjemi"> B.Bouadjemi</a>, <a href="https://publications.waset.org/abstracts/search?q=T.Lantri"> T.Lantri</a>, <a href="https://publications.waset.org/abstracts/search?q=W.%20Benstaali"> W. Benstaali</a>, <a href="https://publications.waset.org/abstracts/search?q=Z.Aziz"> Z.Aziz</a>, <a href="https://publications.waset.org/abstracts/search?q=S.Cherid"> S.Cherid</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Sefir"> A. Sefir</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Using the first-principles method, we investigate the structural, electronic, and magnetic properties of the diluted magnetic semiconductors CdCoTe and CdMnTe in the zinc blende phase with 12.5% of Cr. The calculations are performed by a developed full potential augmented plane wave (FP-L/APW) method within the spin density functional theory (DFT). As exchange–correlation potential, we used the new generalized gradient approximation GGA. Structural properties are determined from the total energy calculations and we found that these compounds are stable in the ferromagnetic phase. We discuss the electronic structures, total and partial densities of states and local moments. Finally, CdCoTe and CdMnTe in the zinc-blend phase show the half-metallic ferromagnetic nature and are expected to be potential materials for spintronic devices. <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=GGA" title=" GGA"> GGA</a>, <a href="https://publications.waset.org/abstracts/search?q=band%20structures" title=" band structures"> band structures</a>, <a href="https://publications.waset.org/abstracts/search?q=half-metallic" title=" half-metallic"> half-metallic</a>, <a href="https://publications.waset.org/abstracts/search?q=spintronics" title=" spintronics"> spintronics</a> </p> <a href="https://publications.waset.org/abstracts/33807/half-metallic-ferromagnetism-in-cdcote-and-cdmnte-ab-initio-study" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/33807.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">451</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">98</span> Effect of the Structural Parameters on Subbands of Fibonacci AlxGa1-xAs/GaAs Superlattices</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Y.%20Sefir">Y. Sefir</a>, <a href="https://publications.waset.org/abstracts/search?q=Z.%20Aziz"> Z. Aziz</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Cherid"> S. Cherid</a>, <a href="https://publications.waset.org/abstracts/search?q=Z.%20F.%20Meghoufel"> Z. F. Meghoufel</a>, <a href="https://publications.waset.org/abstracts/search?q=F.%20Bendahama"> F. Bendahama</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Terkhi"> S. Terkhi</a>, <a href="https://publications.waset.org/abstracts/search?q=B.%20Bouadjemi.%20A.%20Zitouni%20S.%20Bentata"> B. Bouadjemi. A. Zitouni S. Bentata</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This work is to study the effect of the variation of structural parameters on the band structure in the quasiperiodic Fibonacci superlattices AlxGa1-xAs/GaAs using the formalism of the transfer matrix and Airy function. Our results show that increasing the width of Fibonacci’s wells of allows to the confinement of subminibands with a widening of minigaps, this causes a consistent and coherent fragmentation. The barrier thickness of Fibonacci bf acts on the width of subminibands by controlling the interaction force between neighboring eigenstates. Its increase gives rise to singularly extended states. The barrier height Fibonacci Vf permit to control the degree of structural disorder in these structures. The variation of these parameters permits the design of laser with modulated wavelength. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=transmission%20coefficient%20%E2%80%93%20Quasiperiodic%20superlattices-%20singularly%20localized%20and%20extended%20states-%20structural%20parameters-%20Laser%20with%20modulated%20wavelength" title="transmission coefficient – Quasiperiodic superlattices- singularly localized and extended states- structural parameters- Laser with modulated wavelength">transmission coefficient – Quasiperiodic superlattices- singularly localized and extended states- structural parameters- Laser with modulated wavelength</a> </p> <a href="https://publications.waset.org/abstracts/39812/effect-of-the-structural-parameters-on-subbands-of-fibonacci-alxga1-xasgaas-superlattices" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/39812.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">374</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">97</span> Full-Potential Investigation of the Electronic and Magnetic Properties of CdCoTe and CdMnTe Diluted Magnetic Semiconductors</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.Zitouni">A.Zitouni</a>, <a href="https://publications.waset.org/abstracts/search?q=S.Bentata"> S.Bentata</a>, <a href="https://publications.waset.org/abstracts/search?q=B.Bouadjemi"> B.Bouadjemi</a>, <a href="https://publications.waset.org/abstracts/search?q=T.Lantri"> T.Lantri</a>, <a href="https://publications.waset.org/abstracts/search?q=W.%20Benstaali"> W. Benstaali</a>, <a href="https://publications.waset.org/abstracts/search?q=Z.Aziz"> Z.Aziz</a>, <a href="https://publications.waset.org/abstracts/search?q=S.Cherid"> S.Cherid</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We investigate the structural, electronic and magnetic properties of the diluted magnetic semiconductors (DMSs) CdCoTe and CdMnTe in the zinc blende phase with 25% of Co and Mn. The calculations are performed by the recent ab initio full potential augmented plane waves (FP_L/APW) method within the spin polarized density-functional theory (DFT) and the generalized gradient approximation GGA. Structural properties are determined from the total energy calculations and we found that these compounds are stable in the ferromagnetic phase. We discuss the electronic structures, total and partial densities of states and total magnetic moments. The calculated densities of states presented in this study identify the half-metallic of CdCoTe and CdMnTe. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=electronic%20structure" title="electronic structure">electronic structure</a>, <a href="https://publications.waset.org/abstracts/search?q=half-metallic" title=" half-metallic"> half-metallic</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetic%20moment" title=" magnetic moment"> magnetic moment</a>, <a href="https://publications.waset.org/abstracts/search?q=total%20and%20partial%20densities%20of%20states" title=" total and partial densities of states"> total and partial densities of states</a> </p> <a href="https://publications.waset.org/abstracts/33106/full-potential-investigation-of-the-electronic-and-magnetic-properties-of-cdcote-and-cdmnte-diluted-magnetic-semiconductors" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/33106.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">497</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">96</span> A Survey on Internet of Things and Fog Computing as a Platform for Internet of Things</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samira%20Kalantary">Samira Kalantary</a>, <a href="https://publications.waset.org/abstracts/search?q=Sara%20Taghipour"> Sara Taghipour</a>, <a href="https://publications.waset.org/abstracts/search?q=Mansoure%20Ghias%20Abadi"> Mansoure Ghias Abadi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The Internet of Things (IOT) is a technological revolution that represents the future of computing and communications. IOT is the convergence of Internet with RFID, NFC, Sensor, and smart objects. Fog Computing is the natural platform for IOT. At present, the IOT as a new network communication technology has rapidly shifted from concept to application under fog computing virtual storage computing platform. In this paper, we describe everything about IOT and difference between cloud computing and fog computing. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=cloud%20computing" title="cloud computing">cloud computing</a>, <a href="https://publications.waset.org/abstracts/search?q=fog%20computing" title=" fog computing"> fog computing</a>, <a href="https://publications.waset.org/abstracts/search?q=Internet%20of%20Things%20%28IoT%29" title=" Internet of Things (IoT)"> Internet of Things (IoT)</a>, <a href="https://publications.waset.org/abstracts/search?q=IOT%20application" title=" IOT application"> IOT application</a> </p> <a href="https://publications.waset.org/abstracts/30670/a-survey-on-internet-of-things-and-fog-computing-as-a-platform-for-internet-of-things" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/30670.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">585</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">95</span> Spin-Polarized Structural, Electronic, and Magnetic Properties of Co and Mn-Doped CdTe in Zinc-Blende Phase</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=A.Zitouni">A.Zitouni</a>, <a href="https://publications.waset.org/abstracts/search?q=S.Bentata"> S.Bentata</a>, <a href="https://publications.waset.org/abstracts/search?q=B.Bouadjemi"> B.Bouadjemi</a>, <a href="https://publications.waset.org/abstracts/search?q=T.Lantri"> T.Lantri</a>, <a href="https://publications.waset.org/abstracts/search?q=W.%20Benstaali"> W. Benstaali</a>, <a href="https://publications.waset.org/abstracts/search?q=Z.Aziz"> Z.Aziz</a>, <a href="https://publications.waset.org/abstracts/search?q=S.Cherid"> S.Cherid</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Sefir"> A. Sefir</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Structural, electronic, and magnetic properties of Co and Mn-doped CdTe have been studied by employing the full potential linear augmented plane waves (FP-LAPW) method within the spin-polarized density functional theory (DFT). The electronic exchange-correlation energy is described by generalized gradient approximation (GGA) as exchange–correlation (XC) potential. We have calculated the lattice parameters, bulk modulii and the first pressure derivatives of the bulk modulii, spin-polarized band structures, and total and local densities of states. The value of calculated magnetic moment per Co and Mn impurity atoms is found to be 2.21 µB for CdCoTe and 3.20 µB for CdMnTe. The calculated densities of states presented in this study identify the half-metallic of Co and Mn-doped CdTe. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=electronic%20structure" title="electronic structure">electronic structure</a>, <a href="https://publications.waset.org/abstracts/search?q=density%20functional%20theory" title=" density functional theory"> density functional theory</a>, <a href="https://publications.waset.org/abstracts/search?q=band%20structures" title=" band structures"> band structures</a>, <a href="https://publications.waset.org/abstracts/search?q=half-metallic" title=" half-metallic"> half-metallic</a>, <a href="https://publications.waset.org/abstracts/search?q=magnetic%20moment" title=" magnetic moment"> magnetic moment</a> </p> <a href="https://publications.waset.org/abstracts/33323/spin-polarized-structural-electronic-and-magnetic-properties-of-co-and-mn-doped-cdte-in-zinc-blende-phase" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/33323.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">94</span> Electronic and Optical Properties of Orthorhombic NdMnO3 with the Modified Becke-Johnson Potential</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=B.%20Bouadjemi">B. Bouadjemi</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Bentata"> S. Bentata</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20Lantri"> T. Lantri</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Abbad"> A. Abbad</a>, <a href="https://publications.waset.org/abstracts/search?q=W.%20Benstaali"> W. Benstaali</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Zitouni"> A. Zitouni</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Cherid"> S. Cherid</a> </p> <p class="card-text"><strong>Abstract:</strong></p> We investigate the electronic structure, magnetic and optical properties of the orthorhombic NdMnO3 through density-functional-theory (DFT) calculations using both generalized gradient approximation GGA and GGA+U approaches, the exchange and correlation effects are taken into account by an orbital independent modified Becke Johnson (MBJ). The predicted band gaps using the MBJ exchange approximation show a significant improvement over previous theoretical work with the common GGA and GGA+U very closer to the experimental results. Band gap dependent optical parameters like dielectric constant, index of refraction, absorption coefficient, reflectivity and conductivity are calculated and analyzed. We find that when using MBJ we have obtained better results for band gap of NdMnO3 than in the case of GGA and GGA+U. The values of band gap founded in this work by MBJ are in a very good agreement with corresponding experimental values compared to other calculations. This comprehensive theoretical study of the optoelectronic properties predicts that this material can be effectively used in optical devices. <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=optical%20properties" title=" optical properties"> optical properties</a>, <a href="https://publications.waset.org/abstracts/search?q=absorption%20coefficient" title=" absorption coefficient"> absorption coefficient</a>, <a href="https://publications.waset.org/abstracts/search?q=strong%20correlation" title=" strong correlation"> strong correlation</a>, <a href="https://publications.waset.org/abstracts/search?q=MBJ" title=" MBJ"> MBJ</a>, <a href="https://publications.waset.org/abstracts/search?q=orthorhombic%20NdMnO3" title=" orthorhombic NdMnO3"> orthorhombic NdMnO3</a>, <a href="https://publications.waset.org/abstracts/search?q=optoelectronic" title=" optoelectronic"> optoelectronic</a> </p> <a href="https://publications.waset.org/abstracts/15712/electronic-and-optical-properties-of-orthorhombic-ndmno3-with-the-modified-becke-johnson-potential" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15712.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">909</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">93</span> Artificial Intelligance Features in Canva</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Amira%20Masood">Amira Masood</a>, <a href="https://publications.waset.org/abstracts/search?q=Zainah%20Alshouri"> Zainah Alshouri</a>, <a href="https://publications.waset.org/abstracts/search?q=Noor%20Bantan"> Noor Bantan</a>, <a href="https://publications.waset.org/abstracts/search?q=Samira%20Kutbi"> Samira Kutbi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Artificial intelligence is continuously becoming more advanced and more widespread and is present in many of our day-to-day lives as a means of assistance in numerous different fields. A growing number of people, companies, and corporations are utilizing Canva and its AI tools as a method of quick and easy media production. Hence, in order to test the integrity of the rapid growth of AI, this paper will explore the usefulness of Canva's advanced design features as well as their accuracy by determining user satisfaction through a survey-based research approach and by investigating whether or not AI is successful enough that it eliminates the need for human alterations. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=artificial%20intelligence" title="artificial intelligence">artificial intelligence</a>, <a href="https://publications.waset.org/abstracts/search?q=canva" title=" canva"> canva</a>, <a href="https://publications.waset.org/abstracts/search?q=features" title=" features"> features</a>, <a href="https://publications.waset.org/abstracts/search?q=users" title=" users"> users</a>, <a href="https://publications.waset.org/abstracts/search?q=satisfaction" title=" satisfaction"> satisfaction</a> </p> <a href="https://publications.waset.org/abstracts/167545/artificial-intelligance-features-in-canva" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/167545.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">106</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">92</span> Protection of the Valves against AC Faults Using the Fast-Acting HVDC Controls</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mesbah%20Tarek">Mesbah Tarek</a>, <a href="https://publications.waset.org/abstracts/search?q=Kelaiaia%20Samia"> Kelaiaia Samia</a>, <a href="https://publications.waset.org/abstracts/search?q=Chiheb%20Sofien"> Chiheb Sofien</a>, <a href="https://publications.waset.org/abstracts/search?q=Kelaiaia%20Mounia%20Samira"> Kelaiaia Mounia Samira</a>, <a href="https://publications.waset.org/abstracts/search?q=Labar%20Hocine"> Labar Hocine</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Short circuit causes important damage in power systems. The aim of this paper is the investigation of the effect of short circuit at the AC side inverter in HVDC transmission line. The cutoff of HVDC transmission line implies important economic losses. In this paper it is proposed an efficient procedure which can protect and eliminate the fault quickly. The theoretical development and simulation are well detailed and illustrated. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=AC%20inverter" title="AC inverter">AC inverter</a>, <a href="https://publications.waset.org/abstracts/search?q=HVDC" title=" HVDC"> HVDC</a>, <a href="https://publications.waset.org/abstracts/search?q=short%20circuit" title=" short circuit"> short circuit</a>, <a href="https://publications.waset.org/abstracts/search?q=switcher%20gate" title=" switcher gate"> switcher gate</a>, <a href="https://publications.waset.org/abstracts/search?q=power%20system" title=" power system"> power system</a> </p> <a href="https://publications.waset.org/abstracts/22000/protection-of-the-valves-against-ac-faults-using-the-fast-acting-hvdc-controls" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/22000.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">561</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">91</span> Routing Metrics and Protocols for Wireless Mesh Networks</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samira%20Kalantary">Samira Kalantary</a>, <a href="https://publications.waset.org/abstracts/search?q=Zohre%20Saatzade"> Zohre Saatzade</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Wireless Mesh Networks (WMNs) are low-cost access networks built on cooperative routing over a backbone composed of stationary wireless routers. WMNs must deal with the highly unstable wireless medium. Thus, routing metrics and protocols are evolving by designing algorithms that consider link quality to choose the best routes. In this work, we analyse the state of the art in WMN metrics and propose taxonomy for WMN routing protocols. Performance measurements of a wireless mesh network deployed using various routing metrics are presented and corroborate our analysis. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=wireless%20mesh%20networks" title="wireless mesh networks">wireless mesh networks</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=routing%20metrics" title=" routing metrics"> routing metrics</a>, <a href="https://publications.waset.org/abstracts/search?q=bioinformatics" title=" bioinformatics"> bioinformatics</a> </p> <a href="https://publications.waset.org/abstracts/2240/routing-metrics-and-protocols-for-wireless-mesh-networks" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/2240.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">453</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">90</span> The Response of LCC to DC System Faults and HVDC Re-Establishment</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mesbah%20Tarek">Mesbah Tarek</a>, <a href="https://publications.waset.org/abstracts/search?q=Kelaiaia%20Samia"> Kelaiaia Samia</a>, <a href="https://publications.waset.org/abstracts/search?q=Chiheb%20Sofien"> Chiheb Sofien</a>, <a href="https://publications.waset.org/abstracts/search?q=Kelaiaia%20Mounia%20Samira"> Kelaiaia Mounia Samira</a>, <a href="https://publications.waset.org/abstracts/search?q=Labar%20Hocine"> Labar Hocine</a> </p> <p class="card-text"><strong>Abstract:</strong></p> As every power systems short circuit failure can occur for HVDC at the DC link. So, the power devices should be protected against over heath produced by this over-current. This can be achieved through the power switchers or fast breaker. After short circuit the system is unable to restart, only after a time delay, because of the potential distribution along the DC link line. An appropriate fast and safety control is proposed and tested successfully. The detailed development and discussion of these faults is presented in this paper. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=HVDC" title="HVDC">HVDC</a>, <a href="https://publications.waset.org/abstracts/search?q=DC%20link" title=" DC link"> DC link</a>, <a href="https://publications.waset.org/abstracts/search?q=switchers" title=" switchers"> switchers</a>, <a href="https://publications.waset.org/abstracts/search?q=short%20circuit" title=" short circuit"> short circuit</a>, <a href="https://publications.waset.org/abstracts/search?q=faults" title=" faults"> faults</a> </p> <a href="https://publications.waset.org/abstracts/21998/the-response-of-lcc-to-dc-system-faults-and-hvdc-re-establishment" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/21998.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">574</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">89</span> Use of Electrochemical Methods for the Inhibition of Scaling with Green Products</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samira%20Ghizellaoui">Samira Ghizellaoui</a>, <a href="https://publications.waset.org/abstracts/search?q=Manel%20Boumagoura"> Manel Boumagoura</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The municipality of Constantine in eastern Algeria draws water from the Hamma groundwater source. The high fouling capacity is due to the high content of bicarbonate (442 mg/L) and calcium (136 mg/L). This work focuses on the use of three new green inhibitors for reducing calcium carbonate scale formation: gallic acid, quercetin and alginate, and on the comparison between them. These inhibitors have proven to be green antiscalants because they have no impact on the environment. Electrochemical methods (chronoamperometry and impedancemetry) were used to evaluate their performance. According to the study, these inhibitors are excellent green chemical inhibitors of scaling, and the best inhibitor is quercetin because it gave a good result with a lower concentration (2mg/L) compared to others inhibitors. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=scaling" title="scaling">scaling</a>, <a href="https://publications.waset.org/abstracts/search?q=green%20inhibitor" title=" green inhibitor"> green inhibitor</a>, <a href="https://publications.waset.org/abstracts/search?q=chronoamperometry" title=" chronoamperometry"> chronoamperometry</a>, <a href="https://publications.waset.org/abstracts/search?q=impedancemetry" title=" impedancemetry"> impedancemetry</a> </p> <a href="https://publications.waset.org/abstracts/167621/use-of-electrochemical-methods-for-the-inhibition-of-scaling-with-green-products" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/167621.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">116</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">88</span> Poly Urea-Formaldehyde for Preconcentration and Determination of Cadmium Ion in Environmental Samples</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Homayon%20Ahmad%20Panahi">Homayon Ahmad Panahi</a>, <a href="https://publications.waset.org/abstracts/search?q=Samira%20Tajik"> Samira Tajik</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamad%20Hadi%20Dehghani"> Mohamad Hadi Dehghani</a>, <a href="https://publications.waset.org/abstracts/search?q=Mostafa%20Khezri"> Mostafa Khezri</a>, <a href="https://publications.waset.org/abstracts/search?q=Elham%20Moniri"> Elham Moniri</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this research, poly urea-formaldehyde was prepared. The poly urea-formaldehyde was characterized by fourier transform infra-red spectroscopy. Then the effects of various parameters on Cd (II) sorption such as pH, contact time were studied. The optimum pH value for sorption of Cd(II) was 5.5. The sorption capacity of poly urea-formaldehyde for Cd (II) were 76.3 mg g−1. A Cd (II) removal of 55% was obtained. The profile of Cd (II) uptake on this sorbent reflects good accessibility of the chelating sites in the poly urea-formaldehyde. The developed method was utilized for determination of Cd (II) in environmental water samples by flame atomic absorption spectrometry with satisfactory results. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=poly%20urea-formaldehyde" title="poly urea-formaldehyde">poly urea-formaldehyde</a>, <a href="https://publications.waset.org/abstracts/search?q=cadmium%20ion" title=" cadmium ion"> cadmium ion</a>, <a href="https://publications.waset.org/abstracts/search?q=environmental%20sample" title=" environmental sample"> environmental sample</a>, <a href="https://publications.waset.org/abstracts/search?q=determination" title=" determination "> determination </a> </p> <a href="https://publications.waset.org/abstracts/15609/poly-urea-formaldehyde-for-preconcentration-and-determination-of-cadmium-ion-in-environmental-samples" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15609.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">547</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">87</span> Survey on Big Data Stream Classification by Decision Tree</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mansoureh%20Ghiasabadi%20Farahani">Mansoureh Ghiasabadi Farahani</a>, <a href="https://publications.waset.org/abstracts/search?q=Samira%20Kalantary"> Samira Kalantary</a>, <a href="https://publications.waset.org/abstracts/search?q=Sara%20Taghi-Pour"> Sara Taghi-Pour</a>, <a href="https://publications.waset.org/abstracts/search?q=Mahboubeh%20Shamsi"> Mahboubeh Shamsi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Nowadays, the development of computers technology and its recent applications provide access to new types of data, which have not been considered by the traditional data analysts. Two particularly interesting characteristics of such data sets include their huge size and streaming nature .Incremental learning techniques have been used extensively to address the data stream classification problem. This paper presents a concise survey on the obstacles and the requirements issues classifying data streams with using decision tree. The most important issue is to maintain a balance between accuracy and efficiency, the algorithm should provide good classification performance with a reasonable time response. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=big%20data" title="big data">big data</a>, <a href="https://publications.waset.org/abstracts/search?q=data%20streams" title=" data streams"> data streams</a>, <a href="https://publications.waset.org/abstracts/search?q=classification" title=" classification"> classification</a>, <a href="https://publications.waset.org/abstracts/search?q=decision%20tree" title=" decision tree"> decision tree</a> </p> <a href="https://publications.waset.org/abstracts/31107/survey-on-big-data-stream-classification-by-decision-tree" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/31107.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">521</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">86</span> Mineralogical Characteristics of Phosphates from the Djebel Onk Deposits: Treatment and Valorization of Co-Products</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samira%20Tlili">Samira Tlili</a>, <a href="https://publications.waset.org/abstracts/search?q=Amina%20Grairia"> Amina Grairia</a>, <a href="https://publications.waset.org/abstracts/search?q=Sihem%20Benayache"> Sihem Benayache</a>, <a href="https://publications.waset.org/abstracts/search?q=Saida%20Bouyegh"> Saida Bouyegh</a>, <a href="https://publications.waset.org/abstracts/search?q=Sabrina%20Ladjama"> Sabrina Ladjama</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdelmoumen%20Guedri"> Abdelmoumen Guedri</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Phosphorites from Djebel Onk Tebessa/Algeria deposit contain a CaO of 50-52 wt. % and P₂O₅ level of ≥ 30.20 wt. %. The microstructure revealed using a spectroscopy electronic microscope (SEM) consists of phosphate granules with an ovular form. In this investigation, we have identified phosphate with varying particle sizes using mineralogical methods. The phosphogypsum formed by the mineralization of natural phosphate has also been discovered. This co-product was formed during the attack on natural phosphates by sulfuric acid. This study demonstrated the effectiveness of the thermoanalytical technique of differential scanning calorimetry (DSC), X-ray diffraction, and EDS/MEB analysis. FTIR analyses also validated the identification of mineral phases with the observation of bands from structural phosphate groups. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=phosphate" title="phosphate">phosphate</a>, <a href="https://publications.waset.org/abstracts/search?q=Djebel%20Onk%20deposit" title=" Djebel Onk deposit"> Djebel Onk deposit</a>, <a href="https://publications.waset.org/abstracts/search?q=mineralogy" title=" mineralogy"> mineralogy</a>, <a href="https://publications.waset.org/abstracts/search?q=valorization" title=" valorization"> valorization</a>, <a href="https://publications.waset.org/abstracts/search?q=phosphogypsum" title=" phosphogypsum"> phosphogypsum</a> </p> <a href="https://publications.waset.org/abstracts/191994/mineralogical-characteristics-of-phosphates-from-the-djebel-onk-deposits-treatment-and-valorization-of-co-products" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/191994.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">22</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">85</span> Limits and Barriers of Value Creation and Projects Development: The Case of Tunisian SMEs</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samira%20Boussema">Samira Boussema</a>, <a href="https://publications.waset.org/abstracts/search?q=Ben%20Hamed%20Salah"> Ben Hamed Salah</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Entrepreneurship was always considered to be the most appropriate remedy for various economies’ symptoms. It is presented as a complex process that faces several barriers thereby inhibiting a project’s implementation phase. In fact, after a careful review of the literature, we noticed that empirical researches on reasons behind non-developing entrepreneurial projects are very rare, suggesting a lack in modeling the process in general and the pre-start phase in particular. Therefore, in this study we try to identify the main environmental barriers to developing business projects in Tunisia through the study of a representative sample of undeveloped projects. To this end, we used a quantitative approach which allowed us to examine the various barriers encountered by young entrepreneurs during their projects’ implementation. Indeed, by modeling the phenomenon we found that these managers face barriers of legal, financial, educational and government support dimensions. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=entrepreneurship" title="entrepreneurship">entrepreneurship</a>, <a href="https://publications.waset.org/abstracts/search?q=environmental%20barriers" title=" environmental barriers"> environmental barriers</a>, <a href="https://publications.waset.org/abstracts/search?q=non-implementation%20of%20projects" title=" non-implementation of projects"> non-implementation of projects</a>, <a href="https://publications.waset.org/abstracts/search?q=structural%20modeling" title=" structural modeling"> structural modeling</a> </p> <a href="https://publications.waset.org/abstracts/40428/limits-and-barriers-of-value-creation-and-projects-development-the-case-of-tunisian-smes" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/40428.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">381</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">84</span> Dynamical and Thermal Study of Twin Impinging Jets a Vertical Plate with Various Jet Velocities and Impinging Distance</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Louaifi%20Hamaili%20Samira">Louaifi Hamaili Samira</a>, <a href="https://publications.waset.org/abstracts/search?q=Mataoui%20Amina"> Mataoui Amina</a>, <a href="https://publications.waset.org/abstracts/search?q=Cheraitia%20Tadjeddine"> Cheraitia Tadjeddine</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This investigation proposes a numerical analysis of two turbulent parallel jets impinging a heated plate. The heat transfer enhancement is carried out according of the main parameters of the jet-wall interaction. The numerical solution of the stationary equations (RANS) is performed by the finite volume method using the k - ε model. A parametric study is performed to evaluate simultaneously the effect of nozzle-plate distance and velocity ratios in the range 0≤λ≤1. It is found that good local cooling is obtained for λ= 0.25 when the impinging distance is between 4w and 8w than for velocity ratios λ=1 and λ= 0.75. On the other hand, for impinging distances exceeding 8w, the velocity ratio λ =0.75 is more appropriate for good local cooling of the plate. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=two%20unequal%20jets" title="two unequal jets">two unequal jets</a>, <a href="https://publications.waset.org/abstracts/search?q=turbulence" title=" turbulence"> turbulence</a>, <a href="https://publications.waset.org/abstracts/search?q=mixing" title=" mixing"> mixing</a>, <a href="https://publications.waset.org/abstracts/search?q=heat%20transfer" title=" heat transfer"> heat transfer</a>, <a href="https://publications.waset.org/abstracts/search?q=CFD" title=" CFD"> CFD</a> </p> <a href="https://publications.waset.org/abstracts/188280/dynamical-and-thermal-study-of-twin-impinging-jets-a-vertical-plate-with-various-jet-velocities-and-impinging-distance" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/188280.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">32</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">83</span> Separation of Some Pyrethroid Insecticides by High-Performance Liquid Chromatography</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Fairouz%20Tazerouti">Fairouz Tazerouti</a>, <a href="https://publications.waset.org/abstracts/search?q=Samira%20Ihadadene"> Samira Ihadadene</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Pyrethroids are synthetic pesticides that originated from the modification of natural pyrethrins to improve their biological activity and stability. They are a family of chiral pesticides with a large number of stereoisomers. Enantiomers of synthetic pyretroids present different insecticidal activity, toxicity against aquatic invertebrates and persistence in the environment so the development of rapid and sensitive chiral methods for the determination of different enantiomers is necessary. In this study, the separation of enantiomers of pyrethroid insecticides has been systematically studied using three commercially chiral high-performance liquid chromatography columns. Useful resolution was obtained for compounds with a variety of acid and alcohol moieties, and containing one to four chiral centres. The chromatographic behaviour of the diastereomers of some of these insecticides by using normal, polar and reversed mobile phase mode were also examined. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=pesticides" title="pesticides">pesticides</a>, <a href="https://publications.waset.org/abstracts/search?q=analysis" title=" analysis"> analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=liquid%20chromatography" title=" liquid chromatography"> liquid chromatography</a>, <a href="https://publications.waset.org/abstracts/search?q=pyrethroids" title=" pyrethroids"> pyrethroids</a> </p> <a href="https://publications.waset.org/abstracts/16635/separation-of-some-pyrethroid-insecticides-by-high-performance-liquid-chromatography" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/16635.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">377</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">82</span> Effects of Gamma Irradiation on Chemical and Antioxidant Properties of Iranian Native Fresh Barberry Fruit</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samira%20Berenji%20Ardestani">Samira Berenji Ardestani</a>, <a href="https://publications.waset.org/abstracts/search?q=Hamid%20Reza%20Akhavan"> Hamid Reza Akhavan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Gamma irradiation greatly reduces the potential microbiological risk of fresh fruits, resulting in improved microbial safety as well as extending their shelf life. The effects of 0.5-2 kGy gamma doses on some physicochemical, microbial and sensory properties of fresh barberry fruits (<em>Berberis vulgaris</em>) during refrigerated storage for 40 days were evaluated. The total anthocyanin and total phenolic contents of barberry fruits decreased in a dose-dependent manner immediately after irradiation and after subsequent storage. In general, it is recommended that, according to the effect of gamma radiation on physicochemical, microbial and sensorial characteristics, doses of 1.25-2 kGy could be used. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=antioxidant%20property" title="antioxidant property">antioxidant property</a>, <a href="https://publications.waset.org/abstracts/search?q=barberry%20fruit" title=" barberry fruit"> barberry fruit</a>, <a href="https://publications.waset.org/abstracts/search?q=chemical%20properties" title=" chemical properties"> chemical properties</a>, <a href="https://publications.waset.org/abstracts/search?q=gamma%20irradiation" title=" gamma irradiation"> gamma irradiation</a> </p> <a href="https://publications.waset.org/abstracts/81364/effects-of-gamma-irradiation-on-chemical-and-antioxidant-properties-of-iranian-native-fresh-barberry-fruit" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/81364.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">279</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">81</span> A Framework for Organizational Architecture of Electronic City and Electronic Municipality</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ali%20Zeynali%20Azim">Ali Zeynali Azim</a>, <a href="https://publications.waset.org/abstracts/search?q=Mostfa%20Basiry"> Mostfa Basiry</a>, <a href="https://publications.waset.org/abstracts/search?q=Samira%20Kafshi"> Samira Kafshi</a>, <a href="https://publications.waset.org/abstracts/search?q=Elnaz%20Behnoud"> Elnaz Behnoud</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study provides a framework for enterprise architecture in electronic city is electronic municipality. Nowadays, information technology as an emerging phenomenon has a special place in the world. Development of information and communication technology causes many changes in various fields, including emerging e-cities, municipalities and citizens. However, e-city and e-municipality need essential enterprise architecture. In order to develop enterprise architecture of e-city and e-municipality, enterprise architecture maturity method should be applied. Therefore, one of the most important needs of organizations is to choose important activities according to limitations. The studies show that there is a close relationship between IT, enterprise architecture, e-city and e-municipality. This study aimed to clarify the concept of IT, enterprise architecture, electronic city and e-municipality and how they are related to each other. Is the existence of each of IT, enterprise architecture, electronic and electronic municipal requires each other? <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=enterprise%20architecture" title="enterprise architecture">enterprise architecture</a>, <a href="https://publications.waset.org/abstracts/search?q=e-city" title=" e-city"> e-city</a>, <a href="https://publications.waset.org/abstracts/search?q=e-municipality" title=" e-municipality"> e-municipality</a>, <a href="https://publications.waset.org/abstracts/search?q=e-government" title=" e-government"> e-government</a>, <a href="https://publications.waset.org/abstracts/search?q=e-citizen" title=" e-citizen"> e-citizen</a>, <a href="https://publications.waset.org/abstracts/search?q=service-oriented%20architecture" title=" service-oriented architecture"> service-oriented architecture</a> </p> <a href="https://publications.waset.org/abstracts/13947/a-framework-for-organizational-architecture-of-electronic-city-and-electronic-municipality" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/13947.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">534</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">80</span> Application of MRI in Radioembolization Imaging and Dosimetry</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Salehi%20Zahabi%20Saleh">Salehi Zahabi Saleh</a>, <a href="https://publications.waset.org/abstracts/search?q=Rajabi%20Hosaien"> Rajabi Hosaien</a>, <a href="https://publications.waset.org/abstracts/search?q=Rasaneh%20Samira"> Rasaneh Samira</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Yttrium-90 (90Y) radioembolisation(RE) is increasingly used for the treatment of patients with unresectable primary or metastatic liver tumours. Image-based approaches to assess microsphere distribution after RE have gained interest but are mostly hampered by the limited imaging possibilities of the Isotope 90Y. Quantitative 90Y-SPECT imaging has limited spatial resolution because it is based on 90Y Bremsstrahlung whereas 90Y-PET has better spatial resolution but low sensitivity. As a consequence, new alternative methods of visualizing the microspheres have been investigated, such as MR imaging of iron-labelled microspheres. It was also shown that MRI combines high sensitivity with high spatial and temporal resolution and with superior soft tissue contrast and thus can be used to cover a broad range of clinically interesting imaging parameters.The aim of the study in this article was to investigate the capability of MRI to measure the intrahepatic microsphere distribution in order to quantify the absorbed radiation dose in RE. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=radioembolisation" title="radioembolisation">radioembolisation</a>, <a href="https://publications.waset.org/abstracts/search?q=MRI" title=" MRI"> MRI</a>, <a href="https://publications.waset.org/abstracts/search?q=imaging" title=" imaging"> imaging</a>, <a href="https://publications.waset.org/abstracts/search?q=dosimetry" title=" dosimetry"> dosimetry</a> </p> <a href="https://publications.waset.org/abstracts/45127/application-of-mri-in-radioembolization-imaging-and-dosimetry" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/45127.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">320</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">79</span> Antioxydant Activity of Flavonoïd’s Extracts of Rhamnus alaternus L. Leaves of Tessala Mountains (Occidental Algeria)</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Benchiha%20Walid">Benchiha Walid</a>, <a href="https://publications.waset.org/abstracts/search?q=Mahroug%20Samira"> Mahroug Samira</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Rhamnus alaternus L. is a shrub that belongs to the family of Rhamnaceae. It is a medicinal plant that is largely used in traditional medicine in Algeria. Five flavonoic extracts obtained of Rhamnus alaternus L. leaves. The flavonoids were evaluated by a method that uses aluminum chloride AlCl3 of each extract; the content is estimated at 19.33 (Hexanic. Extract), 18.42 (Chlroformic.extract), 16.75 (Acetate. Extract), 3.9 (Brute. Extract), and 3.02 (Aqueous. Extract) mg Equivalent quercetine/gram of extract (mg QE/ g extract). The antioxidant activity was realized by the antiradical test that was evaluated by using DPHH (2.2 diphenyl-1-1picrylhdrazile), the inhibitory concentration at 50% (CI50) were estimated at 74.78 (Vitamin.C), 143.78 (Catechine), 101.78 (Gallic acid), 205.41 (Tannic acid), 210 (Caffeic acid) µg/ml; 74.16 (Br.extr), 9.98 (Aq.extr), 54.08 (Hèx.extr), 8.64 (Ac.extr), 30.49 (Ch.extr) mg/ml. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Rhamnus%20alaternus%20L." title="Rhamnus alaternus L.">Rhamnus alaternus L.</a>, <a href="https://publications.waset.org/abstracts/search?q=flavonoids" title=" flavonoids"> flavonoids</a>, <a href="https://publications.waset.org/abstracts/search?q=antioxydant%20activity" title=" antioxydant activity"> antioxydant activity</a>, <a href="https://publications.waset.org/abstracts/search?q=Tessala" title=" Tessala"> Tessala</a> </p> <a href="https://publications.waset.org/abstracts/31838/antioxydant-activity-of-flavonoids-extracts-of-rhamnus-alaternus-l-leaves-of-tessala-mountains-occidental-algeria" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/31838.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">531</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">78</span> Numerical Simulation of Fluid Structure Interaction Using Two-Way Method</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samira%20Laidaoui">Samira Laidaoui</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohammed%20Djermane"> Mohammed Djermane</a>, <a href="https://publications.waset.org/abstracts/search?q=Nazihe%20Terfaya"> Nazihe Terfaya</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The fluid-structure coupling is a natural phenomenon which reflects the effects of two continuums: fluid and structure of different types in the reciprocal action on each other, involving knowledge of elasticity and fluid mechanics. The solution for such problems is based on the relations of continuum mechanics and is mostly solved with numerical methods. It is a computational challenge to solve such problems because of the complex geometries, intricate physics of fluids, and complicated fluid-structure interactions. The way in which the interaction between fluid and solid is described gives the largest opportunity for reducing the computational effort. In this paper, a problem of fluid structure interaction is investigated with two-way coupling method. The formulation Arbitrary Lagrangian-Eulerian (ALE) was used, by considering a dynamic grid, where the solid is described by a Lagrangian formulation and the fluid by a Eulerian formulation. The simulation was made on the ANSYS software. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ALE" title="ALE">ALE</a>, <a href="https://publications.waset.org/abstracts/search?q=coupling" title=" coupling"> coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=FEM" title=" FEM"> FEM</a>, <a href="https://publications.waset.org/abstracts/search?q=fluid-structure" title=" fluid-structure"> fluid-structure</a>, <a href="https://publications.waset.org/abstracts/search?q=interaction" title=" interaction"> interaction</a>, <a href="https://publications.waset.org/abstracts/search?q=one-way%20method" title=" one-way method"> one-way method</a>, <a href="https://publications.waset.org/abstracts/search?q=two-way%20method" title=" two-way method"> two-way method</a> </p> <a href="https://publications.waset.org/abstracts/36752/numerical-simulation-of-fluid-structure-interaction-using-two-way-method" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/36752.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">678</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">77</span> On the Use of Analytical Performance Models to Design a High-Performance Active Queue Management Scheme</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shahram%20Jamali">Shahram Jamali</a>, <a href="https://publications.waset.org/abstracts/search?q=Samira%20Hamed"> Samira Hamed </a> </p> <p class="card-text"><strong>Abstract:</strong></p> One of the open issues in Random Early Detection (RED) algorithm is how to set its parameters to reach high performance for the dynamic conditions of the network. Although original RED uses fixed values for its parameters, this paper follows a model-based approach to upgrade performance of the RED algorithm. It models the routers queue behavior by using the Markov model and uses this model to predict future conditions of the queue. This prediction helps the proposed algorithm to make some tunings over RED's parameters and provide efficiency and better performance. Widespread packet level simulations confirm that the proposed algorithm, called Markov-RED, outperforms RED and FARED in terms of queue stability, bottleneck utilization and dropped packets count. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=active%20queue%20management" title="active queue management">active queue management</a>, <a href="https://publications.waset.org/abstracts/search?q=RED" title=" RED"> RED</a>, <a href="https://publications.waset.org/abstracts/search?q=Markov%20model" title=" Markov model"> Markov model</a>, <a href="https://publications.waset.org/abstracts/search?q=random%20early%20detection%20algorithm" title=" random early detection algorithm "> random early detection algorithm </a> </p> <a href="https://publications.waset.org/abstracts/33934/on-the-use-of-analytical-performance-models-to-design-a-high-performance-active-queue-management-scheme" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/33934.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">539</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">76</span> Improvement Perturb and Observe for a Fast Response MPPT Applied to Photovoltaic Panel</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Labar%20Hocine">Labar Hocine</a>, <a href="https://publications.waset.org/abstracts/search?q=Kelaiaia%20Mounia%20Samira"> Kelaiaia Mounia Samira</a>, <a href="https://publications.waset.org/abstracts/search?q=Mesbah%20Tarek"> Mesbah Tarek</a>, <a href="https://publications.waset.org/abstracts/search?q=Kelaiaia%20Samia"> Kelaiaia Samia</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Maximum power point tracking (MPPT) techniques are used in photovoltaic (PV) systems to maximize the PV array output power by tracking continuously the maximum power point(MPP) which depends on panels temperature and on irradiance conditions. The main drawback of P&O is that, the operating point oscillates around the MPP giving rise to the waste of some amount of available energy; moreover, it is well known that the P&O algorithm can be confused during those time intervals characterized by rapidly changing atmospheric conditions. In this paper, it is shown that in order to limit the negative effects associated to the above drawbacks, the P&O MPPT parameters must be customized to the dynamic behavior of the specific converter adopted. A theoretical analysis allowing the optimal choice of such initial set parameters is also carried out. The fast convergence of the proposal is proven. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=P%26O" title="P&O">P&O</a>, <a href="https://publications.waset.org/abstracts/search?q=Taylor%E2%80%99s%20series" title=" Taylor’s series"> Taylor’s series</a>, <a href="https://publications.waset.org/abstracts/search?q=MPPT" title=" MPPT"> MPPT</a>, <a href="https://publications.waset.org/abstracts/search?q=photovoltaic%20panel" title=" photovoltaic panel "> photovoltaic panel </a> </p> <a href="https://publications.waset.org/abstracts/21985/improvement-perturb-and-observe-for-a-fast-response-mppt-applied-to-photovoltaic-panel" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/21985.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">587</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">75</span> Low Temperature Synthesis of Styrene via Catalytic Dehydrogenation of Ethylbenzene Using Vanadia Support SnO₂ Catalysts</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20Said">S. Said</a>, <a href="https://publications.waset.org/abstracts/search?q=Samira%20M.%20Abdel-Azim"> Samira M. Abdel-Azim</a>, <a href="https://publications.waset.org/abstracts/search?q=Aya%20M.%20Matloob"> Aya M. Matloob</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Nowadays, one of the most important industries is how to prepare a starting material like (styrene) which is used for the preparation of many petrochemical products in simple and inexpensive ways. Oxidative dehydrogenation of ethylbenzene (using CO2 as a soft oxidant) can solve this issue when using highly effective catalysts like SnO₂ and its nanocomposites (V₂Ox/SnO₂.) This study shows the effect of different synthesis methods of SnO₂ either by ethylene glycol or MOF then, uses the impregnation method for the preparation of its nanocomposite catalysts (V₂Ox/SnO₂.). The prepared catalysts were characterized by using different analytical techniques like XRD, BET, FTIR, TGA, XPS, and H₂-TPR. Oxidative dehydrogenation experimental results demonstrated that the composite V loading of 1 and 5 wt.% V₂Ox/SnO₂ (MOF &EG) catalyst exhibited extraordinarily high catalytic performance with selectivity toward styrene formation > 90% at 500oC, which can be attributed to the superior surface, textural, and structural properties of nanocomposites catalysts. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=SnO%E2%82%82" title="SnO₂">SnO₂</a>, <a href="https://publications.waset.org/abstracts/search?q=vanadium%20oxide" title=" vanadium oxide"> vanadium oxide</a>, <a href="https://publications.waset.org/abstracts/search?q=ethylbenzene%20dehydrogenation" title=" ethylbenzene dehydrogenation"> ethylbenzene dehydrogenation</a>, <a href="https://publications.waset.org/abstracts/search?q=styrene" title=" styrene"> styrene</a>, <a href="https://publications.waset.org/abstracts/search?q=CO%E2%82%82" title=" CO₂"> CO₂</a> </p> <a href="https://publications.waset.org/abstracts/190961/low-temperature-synthesis-of-styrene-via-catalytic-dehydrogenation-of-ethylbenzene-using-vanadia-support-sno2-catalysts" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/190961.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">24</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">74</span> Bioremediation Effect on Shear Strength of Contaminated Soils </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Samira%20Abbaspour">Samira Abbaspour</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Soil contamination by oil industry is unavoidable issue; irrespective of environmental impact, which occurs during the process of soil contaminating and remediating. Effect of this phenomenon on the geotechnical properties of the soil has not been investigated thoroughly. Some researchers studied the environmental aspects of these phenomena more than geotechnical point of view. In this research, compaction and unconfined compression tests were conducted on samples of natural, contaminated and treated soil after 50 days of bio-treatment. The results manifest that increasing the amount of crude oil, leads to decreased values of maximum dry density and optimum water content and increased values of unconfined compression strength (UCS). However, almost 65% of this contamination terminated by using a Bioremer as a bioremediation agent. Foremost, as bioremediation takes place, values of maximum dry density, unconfined compression strength and failure strain increase. <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=shear%20strength" title=" shear strength"> shear strength</a>, <a href="https://publications.waset.org/abstracts/search?q=compaction" title=" compaction"> compaction</a>, <a href="https://publications.waset.org/abstracts/search?q=oil%20contamination" title=" oil contamination"> oil contamination</a> </p> <a href="https://publications.waset.org/abstracts/84458/bioremediation-effect-on-shear-strength-of-contaminated-soils" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/84458.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right 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