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barrier</title> <meta name="description" content="Search results for: flux barrier"> <meta name="keywords" content="flux barrier"> <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="flux barrier"> <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> 1368</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: flux barrier</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">1368</span> Research on Axial End Flux Leakage and Detent Force of Transverse Flux PM Linear Machine</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=W.%20R.%20Li">W. R. Li</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20K.%20Xia"> J. K. Xia</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Q.%20Peng"> R. Q. Peng</a>, <a href="https://publications.waset.org/abstracts/search?q=Z.%20Y.%20Guo"> Z. Y. Guo</a>, <a href="https://publications.waset.org/abstracts/search?q=L.%20Jiang"> L. Jiang </a> </p> <p class="card-text"><strong>Abstract:</strong></p> According to 3D magnetic circuit of the transverse flux PM linear machine, distribution law is presented, and analytical expression of axial end flux leakage is derived using numerical method. Maxwell stress tensor is used to solve detent force of mover. A 3D finite element model of the transverse flux PM machine is built to analyze the flux distribution and detent force. Experimental results of the prototype verified the validity of axial end flux leakage and detent force theoretical derivation, the research on axial end flux leakage and detent force provides a valuable reference to other types of linear machine. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=axial%20end%20flux%20leakage" title="axial end flux leakage">axial end flux leakage</a>, <a href="https://publications.waset.org/abstracts/search?q=detent%20force" title=" detent force"> detent force</a>, <a href="https://publications.waset.org/abstracts/search?q=flux%20distribution" title=" flux distribution"> flux distribution</a>, <a href="https://publications.waset.org/abstracts/search?q=transverse%20flux%20PM%20linear%20machine" title=" transverse flux PM linear machine"> transverse flux PM linear machine</a> </p> <a href="https://publications.waset.org/abstracts/46785/research-on-axial-end-flux-leakage-and-detent-force-of-transverse-flux-pm-linear-machine" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/46785.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">1367</span> Temperature-Dependent Barrier Characteristics of Inhomogeneous Pd/n-GaN Schottky Barrier Diodes Surface</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=K.%20Al-Heuseen">K. Al-Heuseen</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20R.%20Hashim"> M. R. Hashim</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The current-voltage (I-V) characteristics of Pd/n-GaN Schottky barrier were studied at temperatures over room temperature (300-470K). The values of ideality factor (n), zero-bias barrier height (φB0), flat barrier height (φBF) and series resistance (Rs) obtained from I-V-T measurements were found to be strongly temperature dependent while (φBo) increase, (n), (φBF) and (Rs) decrease with increasing temperature. The apparent Richardson constant was found to be 2.1x10-9 Acm-2K-2 and mean barrier height of 0.19 eV. After barrier height inhomogeneities correction, by assuming a Gaussian distribution (GD) of the barrier heights, the Richardson constant and the mean barrier height were obtained as 23 Acm-2K-2 and 1.78eV, respectively. The corrected Richardson constant was very closer to theoretical value of 26 Acm-2K-2. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=electrical%20properties" title="electrical properties">electrical properties</a>, <a href="https://publications.waset.org/abstracts/search?q=Gaussian%20distribution" title=" Gaussian distribution"> Gaussian distribution</a>, <a href="https://publications.waset.org/abstracts/search?q=Pd-GaN%20Schottky%20diodes" title=" Pd-GaN Schottky diodes"> Pd-GaN Schottky diodes</a>, <a href="https://publications.waset.org/abstracts/search?q=thermionic%20emission" title=" thermionic emission"> thermionic emission</a> </p> <a href="https://publications.waset.org/abstracts/7401/temperature-dependent-barrier-characteristics-of-inhomogeneous-pdn-gan-schottky-barrier-diodes-surface" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/7401.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">277</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">1366</span> Effect of Zinc Oxide on Characteristics of Active Flux TIG Welds of 1050 Aluminum Plates</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=H.%20Fazlinejad">H. Fazlinejad</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Halvaee"> A. Halvaee</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this study, characteristics of ATIG welds using ZnO flux on aluminum was investigated and compared with TIG welds. Autogenously AC-ATIG bead on plate welding was applied on Al1050 plate with a coating of ZnO as the flux. Different levels of welding current and flux layer thickness was considered to study the effect of heat input and flux quantity on ATIG welds and was compared with those of TIG welds. Geometrical investigation of the weld cross sections revealed that penetration depth of the ATIG welds with ZnO flux, was increased up to 2 times in some samples compared to the TIG welds. Optical metallographic and Scanning Electron Microscopy (SEM) observations revealed similar microstructures in TIG and ATIG welds. Composition of the ATIG welds slag was also analyzed using X-ray diffraction. In both TIG and ATIG samples, the lowest values of microhardness were observed in the HAZ. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ATIG" title="ATIG">ATIG</a>, <a href="https://publications.waset.org/abstracts/search?q=active%20flux" title=" active flux"> active flux</a>, <a href="https://publications.waset.org/abstracts/search?q=weld%20penetration" title=" weld penetration"> weld penetration</a>, <a href="https://publications.waset.org/abstracts/search?q=Al%201050" title=" Al 1050"> Al 1050</a>, <a href="https://publications.waset.org/abstracts/search?q=ZnO" title=" ZnO"> ZnO</a> </p> <a href="https://publications.waset.org/abstracts/103663/effect-of-zinc-oxide-on-characteristics-of-active-flux-tig-welds-of-1050-aluminum-plates" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/103663.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">165</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">1365</span> A Comprehensive Review of Axial Flux Machines and Its Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shahbaz%20Amin">Shahbaz Amin</a>, <a href="https://publications.waset.org/abstracts/search?q=Sabir%20Hussain%20Shah"> Sabir Hussain Shah</a>, <a href="https://publications.waset.org/abstracts/search?q=Sahib%20Khan"> Sahib Khan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper presents a thorough review concerning the design types of axial flux permanent magnet machines (AFPM) in terms of different features such as construction, design, materials, and manufacturing. Particular emphasis is given on the design and performance analysis of AFPM machines. A comparison among different permanent magnet machines is also provided. First of all, early and modern axial flux machines are mentioned. Secondly, rotor construction of different axial flux machines is described, then different stator constructions are mentioned depending upon the presence of slots and stator back iron. Then according to the arrangement of the rotor stator structure the machines are classified into single, double and multi-stack arrangements. Advantages, disadvantages and applications of each type of rotor and stator are pointed out. Finally on the basis of the reviewed literature merits, demerits, features and application of different axial flux machines structures are explained and clarified. Thus, this paper provides connection between the machines that are currently being used in industry and the developments of AFPM throughout the years. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=axial%20flux%20machines" title="axial flux machines">axial flux machines</a>, <a href="https://publications.waset.org/abstracts/search?q=axial%20flux%20applications" title=" axial flux applications"> axial flux applications</a>, <a href="https://publications.waset.org/abstracts/search?q=coreless%20machines" title=" coreless machines"> coreless machines</a>, <a href="https://publications.waset.org/abstracts/search?q=PM%20machines" title=" PM machines"> PM machines</a> </p> <a href="https://publications.waset.org/abstracts/95500/a-comprehensive-review-of-axial-flux-machines-and-its-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/95500.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">217</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">1364</span> Research on Placement Method of the Magnetic Flux Leakage Sensor Based on Online Detection of the Transformer Winding Deformation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Wei%20Zheng">Wei Zheng</a>, <a href="https://publications.waset.org/abstracts/search?q=Mao%20Ji"> Mao Ji</a>, <a href="https://publications.waset.org/abstracts/search?q=Zhe%20Hou"> Zhe Hou</a>, <a href="https://publications.waset.org/abstracts/search?q=Meng%20Huang"> Meng Huang</a>, <a href="https://publications.waset.org/abstracts/search?q=Bo%20Qi"> Bo Qi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The transformer is the key equipment of the power system. Winding deformation is one of the main transformer defects, and timely and effective detection of the transformer winding deformation can ensure the safe and stable operation of the transformer to the maximum extent. When winding deformation occurs, the size, shape and spatial position of the winding will change, which directly leads to the change of magnetic flux leakage distribution. Therefore, it is promising to study the online detection method of the transformer winding deformation based on magnetic flux leakage characteristics, in which the key step is to study the optimal placement method of magnetic flux leakage sensors inside the transformer. In this paper, a simulation model of the transformer winding deformation is established to obtain the internal magnetic flux leakage distribution of the transformer under normal operation and different winding deformation conditions, and the law of change of magnetic flux leakage distribution due to winding deformation is analyzed. The results show that different winding deformation leads to different characteristics of the magnetic flux leakage distribution. On this basis, an optimized placement of magnetic flux leakage sensors inside the transformer is proposed to provide a basis for the online detection method of transformer winding deformation based on the magnetic flux leakage characteristics. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=magnetic%20flux%20leakage" title="magnetic flux leakage">magnetic flux leakage</a>, <a href="https://publications.waset.org/abstracts/search?q=sensor%20placement%20method" title=" sensor placement method"> sensor placement method</a>, <a href="https://publications.waset.org/abstracts/search?q=transformer" title=" transformer"> transformer</a>, <a href="https://publications.waset.org/abstracts/search?q=winding%20deformation" title=" winding deformation"> winding deformation</a> </p> <a href="https://publications.waset.org/abstracts/136348/research-on-placement-method-of-the-magnetic-flux-leakage-sensor-based-on-online-detection-of-the-transformer-winding-deformation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/136348.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">196</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">1363</span> Magnetic End Leakage Flux in a Spoke Type Rotor Permanent Magnet Synchronous Generator</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Petter%20Eklund">Petter Eklund</a>, <a href="https://publications.waset.org/abstracts/search?q=Jonathan%20Sj%C3%B6lund"> Jonathan Sjölund</a>, <a href="https://publications.waset.org/abstracts/search?q=Sandra%20Eriksson"> Sandra Eriksson</a>, <a href="https://publications.waset.org/abstracts/search?q=Mats%20Leijon"> Mats Leijon</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The spoke type rotor can be used to obtain magnetic flux concentration in permanent magnet machines. This allows the air gap magnetic flux density to exceed the remanent flux density of the permanent magnets but gives problems with leakage fluxes in the magnetic circuit. The end leakage flux of one spoke type permanent magnet rotor design is studied through measurements and finite element simulations. The measurements are performed in the end regions of a 12 kW prototype generator for a vertical axis wind turbine. The simulations are made using three dimensional finite elements to calculate the magnetic field distribution in the end regions of the machine. Also two dimensional finite element simulations are performed and the impact of the two dimensional approximation is studied. It is found that the magnetic leakage flux in the end regions of the machine is equal to about 20% of the flux in the permanent magnets. The overestimation of the performance by the two dimensional approximation is quantified and a curve-fitted expression for its behavior is suggested. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=end%20effects" title="end effects">end effects</a>, <a href="https://publications.waset.org/abstracts/search?q=end%20leakage%20flux" title=" end leakage flux"> end leakage flux</a>, <a href="https://publications.waset.org/abstracts/search?q=permanent%20magnet%20machine" title=" permanent magnet machine"> permanent magnet machine</a>, <a href="https://publications.waset.org/abstracts/search?q=spoke%20type%20rotor" title=" spoke type rotor"> spoke type rotor</a> </p> <a href="https://publications.waset.org/abstracts/65632/magnetic-end-leakage-flux-in-a-spoke-type-rotor-permanent-magnet-synchronous-generator" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/65632.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">332</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">1362</span> Predicting the Adsorptive Capacities of Biosolid as a Barrier in Soil to Remove Industrial Contaminants</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=H.%20Aguedal">H. Aguedal</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20Hentit"> H. Hentit</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Aziz"> A. Aziz</a>, <a href="https://publications.waset.org/abstracts/search?q=D.%20R.%20Merouani"> D. R. Merouani</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Iddou"> A. Iddou</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The major environmental risk of soil pollution is the contamination of groundwater by infiltration of organic and inorganic pollutants that can cause a serious pollution. To protect the groundwater, in this study, we proceeded to test the reliability of a bio solid as barrier to prevent the migration of a very dangerous pollutant ‘Cadmium’ through the different soil layers. The follow-up the influence of several parameters, such as: turbidity, pluviometry, initial concentration of cadmium and the nature of soil, allow us to find the most effective manner to integrate this barrier in the soil. From the results obtained, we noted the effective intervention of the barrier. Indeed, the recorded passing quantities are lowest for the highest rainfall; we noted that the barrier has a better affinity towards higher concentrations; the most retained amounts of cadmium has been in the top layer of the two types of soil, while the lowest amounts of cadmium are recorded in the inner layers of soils. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=adsorption%20of%20cadmium" title="adsorption of cadmium">adsorption of cadmium</a>, <a href="https://publications.waset.org/abstracts/search?q=barrier" title=" barrier"> barrier</a>, <a href="https://publications.waset.org/abstracts/search?q=groundwater%20pollution" title=" groundwater pollution"> groundwater pollution</a>, <a href="https://publications.waset.org/abstracts/search?q=protection" title=" protection"> protection</a> </p> <a href="https://publications.waset.org/abstracts/32763/predicting-the-adsorptive-capacities-of-biosolid-as-a-barrier-in-soil-to-remove-industrial-contaminants" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/32763.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">364</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">1361</span> Sensitivity Analysis of External-Rotor Permanent Magnet Assisted Synchronous Reluctance Motor</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hadi%20Aghazadeh">Hadi Aghazadeh</a>, <a href="https://publications.waset.org/abstracts/search?q=Seyed%20Ebrahim%20Afjei"> Seyed Ebrahim Afjei</a>, <a href="https://publications.waset.org/abstracts/search?q=Alireza%20Siadatan"> Alireza Siadatan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, a proper approach is taken to assess a set of the most effective rotor design parameters for an external-rotor permanent magnet assisted synchronous reluctance motor (PMaSynRM) and therefore to tackle the design complexity of the rotor structure. There are different advantages for introducing permanent magnets into the rotor flux barriers, some of which are to saturate the rotor iron ribs, to increase the motor torque density and to improve the power factor. Moreover, the d-axis and q-axis inductances are of great importance to simultaneously achieve maximum developed torque and low torque ripple. Therefore, sensitivity analysis of the rotor geometry of an 8-pole external-rotor permanent magnet assisted synchronous reluctance motor is performed. Several magnetically accurate finite element analyses (FEA) are conducted to characterize the electromagnetic performance of the motor. The analyses validate torque and power factor equations for the proposed external-rotor motor. Based upon the obtained results and due to an additional term, permanent magnet torque, added to the reluctance torque, the electromagnetic torque of the PMaSynRM increases. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=permanent%20magnet%20assisted%20synchronous%20reluctance%20motor" title="permanent magnet assisted synchronous reluctance motor">permanent magnet assisted synchronous reluctance motor</a>, <a href="https://publications.waset.org/abstracts/search?q=flux%20barrier" title=" flux barrier"> flux barrier</a>, <a href="https://publications.waset.org/abstracts/search?q=flux%20carrier" title=" flux carrier"> flux carrier</a>, <a href="https://publications.waset.org/abstracts/search?q=electromagnetic%20torque" title=" electromagnetic torque"> electromagnetic torque</a>, <a href="https://publications.waset.org/abstracts/search?q=and%20power%20factor" title=" and power factor"> and power factor</a> </p> <a href="https://publications.waset.org/abstracts/85367/sensitivity-analysis-of-external-rotor-permanent-magnet-assisted-synchronous-reluctance-motor" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/85367.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">331</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">1360</span> Modification of Fick’s First Law by Introducing the Time Delay</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=H.%20Namazi">H. Namazi</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20T.%20N.%20Kuan"> H. T. N. Kuan</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Fick's first law relates the diffusive flux to the concentration field, by postulating that the flux goes from regions of high concentration to regions of low concentration, with a magnitude that is proportional to the concentration gradient (spatial derivative). It is clear that the diffusion of flux cannot be instantaneous and should be some time delay in this propagation. But Fick’s first law doesn’t consider this delay which results in some errors especially when there is a considerable time delay in the process. In this paper, we introduce a time delay to Fick’s first law. By this modification, we consider that the diffusion of flux cannot be instantaneous. In order to verify this claim an application sample in fluid diffusion is discussed and the results of modified Fick’s first law, Fick’s first law and the experimental results are compared. The results of this comparison stand for the accuracy of the modified model. The modified model can be used in any application where the time delay has considerable value and neglecting its effect reflects in undesirable results. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Fick%27s%20first%20law" title="Fick's first law">Fick's first law</a>, <a href="https://publications.waset.org/abstracts/search?q=flux" title=" flux"> flux</a>, <a href="https://publications.waset.org/abstracts/search?q=diffusion" title=" diffusion"> diffusion</a>, <a href="https://publications.waset.org/abstracts/search?q=time%20delay" title=" time delay"> time delay</a>, <a href="https://publications.waset.org/abstracts/search?q=modified%20Fick%E2%80%99s%20first%20law" title=" modified Fick’s first law"> modified Fick’s first law</a> </p> <a href="https://publications.waset.org/abstracts/19767/modification-of-ficks-first-law-by-introducing-the-time-delay" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/19767.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">408</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">1359</span> Measurement and Simulation of Axial Neutron Flux Distribution in Dry Tube of KAMINI Reactor</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Manish%20Chand">Manish Chand</a>, <a href="https://publications.waset.org/abstracts/search?q=Subhrojit%20Bagchi"> Subhrojit Bagchi</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Kumar"> R. Kumar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A new dry tube (DT) has been installed in the tank of KAMINI research reactor, Kalpakkam India. This tube will be used for neutron activation analysis of small to large samples and testing of neutron detectors. DT tube is 375 cm height and 7.5 cm in diameter, located 35 cm away from the core centre. The experimental thermal flux at various axial positions inside the tube has been measured by irradiating the flux monitor (¹⁹⁷Au) at 20kW reactor power. The measured activity of ¹⁹⁸Au and the thermal cross section of ¹⁹⁷Au (n,γ) ¹⁹⁸Au reaction were used for experimental thermal flux measurement. The flux inside the tube varies from 10⁹ to 10¹⁰ and maximum flux was (1.02 ± 0.023) x10¹⁰ n cm⁻²s⁻¹ at 36 cm from the bottom of the tube. The Au and Zr foils without and with cadmium cover of 1-mm thickness were irradiated at the maximum flux position in the DT to find out the irradiation specific input parameters like sub-cadmium to epithermal neutron flux ratio (f) and the epithermal neutron flux shape factor (α). The f value was 143 ± 5, indicates about 99.3% thermal neutron component and α value was -0.2886 ± 0.0125, indicates hard epithermal neutron spectrum due to insufficient moderation. The measured flux profile has been validated using theoretical model of KAMINI reactor through Monte Carlo N-Particle Code (MCNP). In MCNP, the complex geometry of the entire reactor is modelled in 3D, ensuring minimum approximations for all the components. Continuous energy cross-section data from ENDF-B/VII.1 as well as S (α, β) thermal neutron scattering functions are considered. The neutron flux has been estimated at the corresponding axial locations of the DT using mesh tally. The thermal flux obtained from the experiment shows good agreement with the theoretically predicted values by MCNP, it was within ± 10%. It can be concluded that this MCNP model can be utilized for calculating other important parameters like neutron spectra, dose rate, etc. and multi elemental analysis can be carried out by irradiating the sample at maximum flux position using measured f and α parameters by k₀-NAA standardization. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=neutron%20flux" title="neutron flux">neutron flux</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20activation%20analysis" title=" neutron activation analysis"> neutron activation analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=neutron%20flux%20shape%20factor" title=" neutron flux shape factor"> neutron flux shape factor</a>, <a href="https://publications.waset.org/abstracts/search?q=MCNP" title=" MCNP"> MCNP</a>, <a href="https://publications.waset.org/abstracts/search?q=Monte%20Carlo%20N-Particle%20Code" title=" Monte Carlo N-Particle Code"> Monte Carlo N-Particle Code</a> </p> <a href="https://publications.waset.org/abstracts/99662/measurement-and-simulation-of-axial-neutron-flux-distribution-in-dry-tube-of-kamini-reactor" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/99662.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">163</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">1358</span> Effect of Epoxy-ZrP Nanocomposite Top Coating on Inorganic Barrier Layer </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Haesook%20Kim">Haesook Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Ha%20Na%20Ra"> Ha Na Ra</a>, <a href="https://publications.waset.org/abstracts/search?q=Mansu%20Kim"> Mansu Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Hyun%20Gi%20Kim"> Hyun Gi Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Sung%20Soo%20Kim"> Sung Soo Kim</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Epoxy-ZrP (α-zirconium phosphate) nanocomposites were coated on inorganic barrier layer such as sputtering and atomic layer deposition (ALD) to improve the barrier properties and protect the layer. ZrP nanoplatelets were synthesized using a reflux method and exfoliated in the polymer matrix. The barrier properties of coating layer were characterized by measuring water vapor transmission rate (WVTR). The WVTR dramatically decreased after epoxy-ZrP nanocomposite coating, while maintaining the optical properties. It was also investigated the effect of epoxy-ZrP coating on inorganic layer after bending and reliability test. The optimal structure composed of inorganic and epoxy-ZrP nanocomposite layers was used in organic light emitting diodes (OLED) encapsulation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=%CE%B1-zirconium%20phosphate" title="α-zirconium phosphate">α-zirconium phosphate</a>, <a href="https://publications.waset.org/abstracts/search?q=barrier%20properties" title=" barrier properties"> barrier properties</a>, <a href="https://publications.waset.org/abstracts/search?q=epoxy%20nanocomposites" title=" epoxy nanocomposites"> epoxy nanocomposites</a>, <a href="https://publications.waset.org/abstracts/search?q=OLED%20encapsulation" title=" OLED encapsulation"> OLED encapsulation</a> </p> <a href="https://publications.waset.org/abstracts/67636/effect-of-epoxy-zrp-nanocomposite-top-coating-on-inorganic-barrier-layer" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/67636.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">357</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">1357</span> Homogenization of a Non-Linear Problem with a Thermal Barrier</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hassan%20Samadi">Hassan Samadi</a>, <a href="https://publications.waset.org/abstracts/search?q=Mustapha%20El%20Jarroudi"> Mustapha El Jarroudi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this work, we consider the homogenization of a non-linear problem in periodic medium with two periodic connected media exchanging a heat flux throughout their common interface. The interfacial exchange coefficient λ is assumed to tend to zero or to infinity following a rate λ=λ(ε) when the size ε of the basic cell tends to zero. Three homogenized problems are determined according to some critical value depending of λ and ε. Our method is based on Γ-Convergence techniques. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=variational%20methods" title="variational methods">variational methods</a>, <a href="https://publications.waset.org/abstracts/search?q=epiconvergence" title=" epiconvergence"> epiconvergence</a>, <a href="https://publications.waset.org/abstracts/search?q=homogenization" title=" homogenization"> homogenization</a>, <a href="https://publications.waset.org/abstracts/search?q=convergence%20technique" title=" convergence technique"> convergence technique</a> </p> <a href="https://publications.waset.org/abstracts/29054/homogenization-of-a-non-linear-problem-with-a-thermal-barrier" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/29054.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">525</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">1356</span> Optimization of a Flux Switching Permanent Magnet Machine Using Laminated Segmented Rotor</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Seyedmilad%20Kazemisangdehi">Seyedmilad Kazemisangdehi</a>, <a href="https://publications.waset.org/abstracts/search?q=Seyedmehdi%20Kazemisangdehi"> Seyedmehdi Kazemisangdehi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Flux switching permanent magnet machines are considered for wide range of applications because of their outstanding merits including high torque/power densities, high efficiency, simple and robust rotor structure. Therefore, several topologies have been proposed like the PM exited flux switching machine, hybrid excited flux switching type, and so on. Recently, a novel laminated segmented rotor flux switching permanent magnet machine was introduced. It features flux barriers on rotor structure to enhance the performances of machine including torque ripple reduction and also torque and efficiency improvements at the same time. This is while, the design of barriers was not optimized by the authors. Therefore, in this paper three coefficients regarding the position of the barriers are considered for optimization. The effect of each coefficient on the performance of this machine is investigated by finite element method and finally an optimized design of flux barriers based on these three coefficients is proposed from different points of view including electromagnetic torque maximization and cogging torque/torque ripple minimization. At optimum design from maximum developed torque aspect, this machine generates 0.65 Nm torque higher than that of the not-optimized design with an almost 0.4 % improvement in efficiency. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=finite%20element%20analysis" title="finite element analysis">finite element analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=FSPM" title=" FSPM"> FSPM</a>, <a href="https://publications.waset.org/abstracts/search?q=laminated%20segmented%20rotor%20flux%20switching%20permanent%20magnet%20machine" title=" laminated segmented rotor flux switching permanent magnet machine"> laminated segmented rotor flux switching permanent magnet machine</a>, <a href="https://publications.waset.org/abstracts/search?q=optimization" title=" optimization"> optimization</a> </p> <a href="https://publications.waset.org/abstracts/127513/optimization-of-a-flux-switching-permanent-magnet-machine-using-laminated-segmented-rotor" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/127513.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">230</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">1355</span> SPPO-Based Cation Exchange Membranes with a Positively Charged Layer for Cation Fractionation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Noor%20Ul%20Afsar">Noor Ul Afsar</a>, <a href="https://publications.waset.org/abstracts/search?q=Wengen%20Ji"> Wengen Ji</a>, <a href="https://publications.waset.org/abstracts/search?q=Bin%20Wu"> Bin Wu</a>, <a href="https://publications.waset.org/abstracts/search?q=Muhammad%20A.%20Shehzad"> Muhammad A. Shehzad</a>, <a href="https://publications.waset.org/abstracts/search?q=Liang%20Ge"> Liang Ge</a>, <a href="https://publications.waset.org/abstracts/search?q=Tongwen%20Xu"> Tongwen Xu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The synthesis of monovalent cation perm-selective membranes (MCPMs) to efficiently discriminate amongst cations from seawater is of great importance for several industrial applications. However, a technical approach is highly desired to construct MCPMs to obtain a high ionic flux and sustain perm-selectivity simultaneously. In the present work, the thickness of the quaternized poly (2, 6-dimethyl-1, 4-phenylene oxide) (QPPO) layer on the surface of the SPPO-PVA (SPVA) composite membrane was adjusted using a facile procedure to achieve high permselectivity without scarifying the ionic flux. The thickness of the selective layer was precisely controlled using various concentrations of the QPPO solution. By the introduction of the cationic layer on the SPVA membrane, the monovalent cation can be separated from the divalent cation by their difference in charge density. The influence of the selective barrier (thickness) endows MCPMs with high perm-selectivity up to 12.7 for 0.1 mol L⁻¹ Li⁺/Mg²⁺ system, which is very satisfactory for polymeric membranes. The fabricated membranes have low electrical resistance and high limiting current density (iₗᵢₘ). Keeping in view the ED results, the prepared membranes with selective surface layers could be a viable candidate for Li⁺ selective separation from divalent cation Mg²⁺. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=monovalent%20cation%20perm-selective%20membranes" title="monovalent cation perm-selective membranes">monovalent cation perm-selective membranes</a>, <a href="https://publications.waset.org/abstracts/search?q=cation%20fractionation" title=" cation fractionation"> cation fractionation</a>, <a href="https://publications.waset.org/abstracts/search?q=perm-selectivity" title=" perm-selectivity"> perm-selectivity</a>, <a href="https://publications.waset.org/abstracts/search?q=ionic%20flux" title=" ionic flux"> ionic flux</a>, <a href="https://publications.waset.org/abstracts/search?q=electrodialysis" title=" electrodialysis"> electrodialysis</a> </p> <a href="https://publications.waset.org/abstracts/173307/sppo-based-cation-exchange-membranes-with-a-positively-charged-layer-for-cation-fractionation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/173307.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">72</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">1354</span> Effect of Variable Fluxes on Optimal Flux Distribution in a Metabolic Network</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ehsan%20Motamedian">Ehsan Motamedian</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Finding all optimal flux distributions of a metabolic model is an important challenge in systems biology. In this paper, a new algorithm is introduced to identify all alternate optimal solutions of a large scale metabolic network. The algorithm reduces the model to decrease computations for finding optimal solutions. The algorithm was implemented on the Escherichia coli metabolic model to find all optimal solutions for lactate and acetate production. There were more optimal flux distributions when acetate production was optimized. The model was reduced from 1076 to 80 variable fluxes for lactate while it was reduced to 91 variable fluxes for acetate. These 11 more variable fluxes resulted in about three times more optimal flux distributions. Variable fluxes were from 12 various metabolic pathways and most of them belonged to nucleotide salvage and extra cellular transport pathways. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=flux%20variability" title="flux variability">flux variability</a>, <a href="https://publications.waset.org/abstracts/search?q=metabolic%20network" title=" metabolic network"> metabolic network</a>, <a href="https://publications.waset.org/abstracts/search?q=mixed-integer%20linear%20programming" title=" mixed-integer linear programming"> mixed-integer linear programming</a>, <a href="https://publications.waset.org/abstracts/search?q=multiple%20optimal%20solutions" title=" multiple optimal solutions"> multiple optimal solutions</a> </p> <a href="https://publications.waset.org/abstracts/15698/effect-of-variable-fluxes-on-optimal-flux-distribution-in-a-metabolic-network" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15698.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">434</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">1353</span> Effect of External Radiative Heat Flux on Combustion Characteristics of Rigid Polyurethane Foam under Piloted-Ignition and Radiative Auto-Ignition Modes</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jia-Jia%20He">Jia-Jia He</a>, <a href="https://publications.waset.org/abstracts/search?q=Lin%20Jiang"> Lin Jiang</a>, <a href="https://publications.waset.org/abstracts/search?q=Jin-Hua%20Sun"> Jin-Hua Sun</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Rigid polyurethane foam (RPU) has been extensively applied in building insulation system, yet with high flammability for being easily ignited by high temperature spark or radiative heat flux from other flaming materials or surrounding building facade. Using a cone calorimeter by Fire Testing Technology and thermal couple tree, this study systematically investigated the effect of radiative heat flux on the ignition time and characteristic temperature distribution during RPU combustion under different heat fluxes gradient (12, 15, 20, 25, 30, 35, 40, 45, and 50 kW/m²) with spark ignition/ignition by radiation. The ignition time decreases proportionally with increase of external heat flux, meanwhile increasing the external heat flux raises the peak heat release rate and impresses on the vertical temperature distribution greatly. The critical ignition heat flux is found to be 15 and 25 kW/m² for spark ignition and radiative ignition, respectively. Based on previous experienced ignition formula, a methodology to predict ignition times in both modes has been developed theoretically. By analyzing the heat transfer mechanism around the sample surroundings, both radiation from cone calorimeter and convection flow are considered and calculated theoretically. The experimental ignition times agree well with the theoretical ones in both radiative and convective conditions; however, the observed critical ignition heat flux is higher than the calculated one under piloted-ignition mode because the heat loss process, especially in lower heat flux radiation, is not considered in this developed methodology. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=rigid%20polyurethane%20foam" title="rigid polyurethane foam">rigid polyurethane foam</a>, <a href="https://publications.waset.org/abstracts/search?q=cone%20calorimeter" title=" cone calorimeter"> cone calorimeter</a>, <a href="https://publications.waset.org/abstracts/search?q=ignition%20time" title=" ignition time"> ignition time</a>, <a href="https://publications.waset.org/abstracts/search?q=external%20heat%20flux" title=" external heat flux"> external heat flux</a> </p> <a href="https://publications.waset.org/abstracts/77115/effect-of-external-radiative-heat-flux-on-combustion-characteristics-of-rigid-polyurethane-foam-under-piloted-ignition-and-radiative-auto-ignition-modes" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/77115.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">208</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">1352</span> Semiconductor Nanofilm Based Schottky-Barrier Solar Cells</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mariyappan%20Shanmugam">Mariyappan Shanmugam</a>, <a href="https://publications.waset.org/abstracts/search?q=Bin%20Yu"> Bin Yu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Schottky-barrier solar cells are demonstrated employing 2D-layered MoS2 and WS2 semiconductor nanofilms as photo-active material candidates synthesized by chemical vapor deposition method. Large area MoS2 and WS2 nanofilms are stacked by layer transfer process to achieve thicker photo-active material studied by atomic force microscopy showing a thickness in the range of ~200 nm. Two major vibrational active modes associated with 2D-layered MoS2 and WS2 are studied by Raman spectroscopic technique to estimate the quality of the nanofilms. Schottky-barrier solar cells employed MoS2 and WS2 active materials exhibited photoconversion efficiency of 1.8 % and 1.7 % respectively. Fermi-level pinning at metal/semiconductor interface, electronic transport and possible recombination mechanisms are studied in the Schottky-barrier solar cells. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=two-dimensional%20nanosheet" title="two-dimensional nanosheet">two-dimensional nanosheet</a>, <a href="https://publications.waset.org/abstracts/search?q=graphene" title=" graphene"> graphene</a>, <a href="https://publications.waset.org/abstracts/search?q=hexagonal%20boron%20nitride" title=" hexagonal boron nitride"> hexagonal boron nitride</a>, <a href="https://publications.waset.org/abstracts/search?q=solar%20cell" title=" solar cell"> solar cell</a>, <a href="https://publications.waset.org/abstracts/search?q=Schottky%20barrier" title=" Schottky barrier"> Schottky barrier</a> </p> <a href="https://publications.waset.org/abstracts/22592/semiconductor-nanofilm-based-schottky-barrier-solar-cells" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/22592.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">330</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">1351</span> The Influence of Different Flux Patterns on Magnetic Losses in Electric Machine Cores</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Natheer%20Alatawneh">Natheer Alatawneh</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The finite element analysis of magnetic fields in electromagnetic devices shows that the machine cores experience different flux patterns including alternating and rotating fields. The rotating fields are generated in different configurations range between circular and elliptical with different ratios between the major and minor axis of the flux locus. Experimental measurements on electrical steel exposed to different flux patterns disclose different magnetic losses in the samples under test. Consequently, electric machines require special attention during the cores loss calculation process to consider the flux patterns. In this study, a circular rotational single sheet tester is employed to measure the core losses in electric steel sample of M36G29. The sample was exposed to alternating field, circular field, and elliptical fields with axis ratios of 0.2, 0.4, 0.6 and 0.8. The measured data was implemented on 6-4 switched reluctance motor at three different frequencies of interest to the industry as 60 Hz, 400 Hz, and 1 kHz. The results disclose a high margin of error that may occur during the loss calculations if the flux patterns issue is neglected. The error in different parts of the machine associated with considering the flux patterns can be around 50%, 10%, and 2% at 60Hz, 400Hz, and 1 kHz, respectively. The future work will focus on the optimization of machine geometrical shape which has a primary effect on the flux pattern in order to minimize the magnetic losses in machine cores. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=alternating%20core%20losses" title="alternating core losses">alternating core losses</a>, <a href="https://publications.waset.org/abstracts/search?q=electric%20machines" title=" electric machines"> electric machines</a>, <a href="https://publications.waset.org/abstracts/search?q=finite%20element%20analysis" title=" finite element analysis"> finite element analysis</a>, <a href="https://publications.waset.org/abstracts/search?q=rotational%20core%20losses" title=" rotational core losses"> rotational core losses</a> </p> <a href="https://publications.waset.org/abstracts/64360/the-influence-of-different-flux-patterns-on-magnetic-losses-in-electric-machine-cores" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/64360.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">252</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">1350</span> Effect of Hydraulic Diameter on Flow Boiling Instability in a Single Microtube with Vertical Upward Flow</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Qian%20You">Qian You</a>, <a href="https://publications.waset.org/abstracts/search?q=Ibrahim%20Hassan"> Ibrahim Hassan</a>, <a href="https://publications.waset.org/abstracts/search?q=Lyes%20Kadem"> Lyes Kadem</a> </p> <p class="card-text"><strong>Abstract:</strong></p> An experiment is conducted to fundamentally investigate flow oscillation characteristics in different sizes of single microtubes in vertical upward flow direction. Three microtubes have 0.889 mm, 0.533 mm, and 0.305 mm hydraulic diameters with 100 mm identical heated length. The mass flux of the working fluid FC-72 varies from 700 kg/m2•s to 1400 kg/m2•s, and the heat flux is uniformly applied on the tube surface up to 9.4 W/cm2. The subcooled inlet temperature is maintained around 24°C during the experiment. The effect of hydraulic diameter and mass flux are studied. The results showed that they have interactions on the flow oscillations occurrence and behaviors. The onset of flow instability (OFI), which is a threshold of unstable flow, usually appears in large microtube with diversified and sustained flow oscillations, while the transient point, which is the point when the flow turns from one stable state to another suddenly, is more observed in small microtube without characterized flow oscillations due to the bubble confinement. The OFI/transient point occurs early as hydraulic diameter reduces at a given mass flux. The increased mass flux can delay the OFI/transient point occurrence in large hydraulic diameter, but no significant effect in small size. Although the only transient point is observed in the smallest tube, it appears at small heat flux and is not sensitive to mass flux; hence, the smallest microtube is not recommended since increasing heat flux may cause local dryout. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=flow%20boiling%20instability" title="flow boiling instability">flow boiling instability</a>, <a href="https://publications.waset.org/abstracts/search?q=hydraulic%20diameter%20effect" title=" hydraulic diameter effect"> hydraulic diameter effect</a>, <a href="https://publications.waset.org/abstracts/search?q=a%20single%20microtube" title=" a single microtube"> a single microtube</a>, <a href="https://publications.waset.org/abstracts/search?q=vertical%20upward%20flow" title=" vertical upward flow"> vertical upward flow</a> </p> <a href="https://publications.waset.org/abstracts/29887/effect-of-hydraulic-diameter-on-flow-boiling-instability-in-a-single-microtube-with-vertical-upward-flow" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/29887.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">600</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">1349</span> Design of a Compact Herriott Cell for Heat Flux Measurement Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=R.%20G.%20Ram%C3%ADrez-Chavarr%C3%ADa">R. G. Ramírez-Chavarría</a>, <a href="https://publications.waset.org/abstracts/search?q=C.%20S%C3%A1nchez-P%C3%A9rez"> C. Sánchez-Pérez</a>, <a href="https://publications.waset.org/abstracts/search?q=V.%20Argueta-D%C3%ADaz"> V. Argueta-Díaz</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper we present the design of an optical device based on a Herriott multi-pass cell fabricated on a small sized acrylic slab for heat flux measurements using the deflection of a laser beam propagating inside the cell. The beam deflection is produced by the heat flux conducted to the acrylic slab due to a gradient in the refractive index. The use of a long path cell as the sensitive element in this measurement device, gives the possibility of high sensitivity within a small size device. We present the optical design as well as some experimental results in order to validate the device’s operation principle. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=heat%20flux" title="heat flux">heat flux</a>, <a href="https://publications.waset.org/abstracts/search?q=Herriott%20cell" title=" Herriott cell"> Herriott cell</a>, <a href="https://publications.waset.org/abstracts/search?q=optical%20beam%20deflection" title=" optical beam deflection"> optical beam deflection</a>, <a href="https://publications.waset.org/abstracts/search?q=thermal%20conductivity" title=" thermal conductivity"> thermal conductivity</a> </p> <a href="https://publications.waset.org/abstracts/31146/design-of-a-compact-herriott-cell-for-heat-flux-measurement-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/31146.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">656</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">1348</span> Flux-Linkage Performance of DFIG Under Different Types of Faults and Locations</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Moustafa%20Mahmoud%20Sedky">Mohamed Moustafa Mahmoud Sedky</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The double-fed induction generator wind turbine has recently received a great attention. The steady state performance and response of double fed induction generator (DFIG) based wind turbine are now well understood. This paper presents the analysis of stator and rotor flux linkage dq models operation of DFIG under different faults and at different locations. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=double%20fed%20induction%20motor" title="double fed induction motor">double fed induction motor</a>, <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=flux%20linkage" title=" flux linkage"> flux linkage</a>, <a href="https://publications.waset.org/abstracts/search?q=short%20circuit" title=" short circuit"> short circuit</a> </p> <a href="https://publications.waset.org/abstracts/27816/flux-linkage-performance-of-dfig-under-different-types-of-faults-and-locations" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/27816.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">517</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">1347</span> Acoustics Barrier Design to Reduce Railway Noise by Using Maekawa's Method</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Malinda%20Sabrina">Malinda Sabrina</a>, <a href="https://publications.waset.org/abstracts/search?q=Khoerul%20Anwar"> Khoerul Anwar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Railway noise generated by pass-by train has been described as a form of environmental pollutants especially for the residential area near the railway. Many studies have shown, that environmental noise particularly transportation noise has negative effects on people which resulting in annoyance and specific health problems such as cardiovascular disease, cognitive impairment and sleep disturbance. Therefore, various attempts are made to reduce the noise. One method of reducing such noise to acceptable noise levels is to build acoustically barrier walls. The objective of this study was to review the method of reducing railway noise and obtain the preliminary design of the acoustics barrier on the edge of railway tracks close to the residential area. The design of this barrier is using the Maekawa's method. Measurements have been performed in residential areas around the railroads in the Karawang - Indonesia with the absence of an acoustical barrier. From the observation, it was found that the railway was passed by five trains within thirty minutes. With the limited distance between the railway tracks and the location of the residential area as well as the street of residents, then it was obtained that a reduction in sound pressure level is 25 dBA. Maximum sound pressure level obtained is 86.9 dBA then by setting the barrier as high as 4 m at a distance, 2.5 m from the railway, the noise level received by residents in the settlement around the railway line becomes 61.9 dBA. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=acoustics%20barrier" title="acoustics barrier">acoustics barrier</a>, <a href="https://publications.waset.org/abstracts/search?q=Maekawa%27s%20method" title=" Maekawa's method"> Maekawa's method</a>, <a href="https://publications.waset.org/abstracts/search?q=noise%20attenuation" title=" noise attenuation"> noise attenuation</a>, <a href="https://publications.waset.org/abstracts/search?q=railway%20noise" title=" railway noise"> railway noise</a> </p> <a href="https://publications.waset.org/abstracts/89421/acoustics-barrier-design-to-reduce-railway-noise-by-using-maekawas-method" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/89421.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">200</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">1346</span> Analysis of Flux-Linkage Performance of DFIG by Using Simulink under Different Types of Faults and Locations</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Moustafa%20Mahmoud%20Sedky">Mohamed Moustafa Mahmoud Sedky</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The double-fed induction generator wind turbine has recently received a great attention. The steady state performance and response of double fed induction generator (DFIG) based wind turbine are now well understood. This paper presents the analysis of stator and rotor flux linkage dq models operation of DFIG under different faults and at different locations. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=double%20fed%20induction%20motor" title="double fed induction motor">double fed induction motor</a>, <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=flux%20linkage" title=" flux linkage"> flux linkage</a>, <a href="https://publications.waset.org/abstracts/search?q=short%20circuit" title=" short circuit "> short circuit </a> </p> <a href="https://publications.waset.org/abstracts/27818/analysis-of-flux-linkage-performance-of-dfig-by-using-simulink-under-different-types-of-faults-and-locations" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/27818.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">588</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">1345</span> Assessment the Capacity of Retention of a Natural Material for the Protection of Ground Water</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Hakim%20Aguedal">Hakim Aguedal</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdelkader%20Iddou"> Abdelkader Iddou</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdalla%20Aziz"> Abdalla Aziz</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdelhadi%20Bentouami"> Abdelhadi Bentouami</a>, <a href="https://publications.waset.org/abstracts/search?q=Ferhat%20Bensalah"> Ferhat Bensalah</a>, <a href="https://publications.waset.org/abstracts/search?q=Salah%20Bensadek"> Salah Bensadek </a> </p> <p class="card-text"><strong>Abstract:</strong></p> The major environmental risk of soil pollution is the contamination of groundwater by infiltration of organic and inorganic pollutants that can cause a serious pollution. To prevent the migration of this pollution through this structure, many studies propose the installation of layers, which play a role of a barrier that inhibiting the contamination of groundwater by limiting or slowing the flow of rainwater carrying pollution through the layers of soil. However, it is practically impossible to build a barrier layer that let through only water, but it is possible to design a structure with low permeability, which reduces the infiltration of dangerous pollutant. In an environmental context of groundwater protection, the main objective of this study was to investigate the environmental and appropriate suitability method to preserve groundwater, by establishment of a permeable reactive barrier (PRB) intermediate in soil. Followed the influence of several parameters allow us to find the most effective materials and the most appropriate way to incorporate this barrier in the soil. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ground%20water" title="Ground water">Ground water</a>, <a href="https://publications.waset.org/abstracts/search?q=protection" title=" protection"> protection</a>, <a href="https://publications.waset.org/abstracts/search?q=permeable%20reactive%20Barrier" title=" permeable reactive Barrier"> permeable reactive Barrier</a>, <a href="https://publications.waset.org/abstracts/search?q=soil%20pollution." title=" soil pollution."> soil pollution.</a> </p> <a href="https://publications.waset.org/abstracts/22346/assessment-the-capacity-of-retention-of-a-natural-material-for-the-protection-of-ground-water" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/22346.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">556</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">1344</span> Wall Heat Flux Mapping in Liquid Rocket Combustion Chamber with Different Jet Impingement Angles</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=O.%20S.%20Pradeep">O. S. Pradeep</a>, <a href="https://publications.waset.org/abstracts/search?q=S.%20Vigneshwaran"> S. Vigneshwaran</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20Praveen%20Kumar"> K. Praveen Kumar</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20Jeyendran"> K. Jeyendran</a>, <a href="https://publications.waset.org/abstracts/search?q=V.%20R.%20Sanal%20Kumar"> V. R. Sanal Kumar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The influence of injector attitude on wall heat flux plays an important role in predicting the start-up transient and also determining the combustion chamber wall durability of liquid rockets. In this paper comprehensive numerical studies have been carried out on an idealized liquid rocket combustion chamber to examine the transient wall heat flux during its start-up transient at different injector attitude. Numerical simulations have been carried out with the help of a validated 2d axisymmetric, double precision, pressure-based, transient, species transport, SST k-omega model with laminar finite rate model for governing turbulent-chemistry interaction for four cases with different jet intersection angles, viz., 0<sup>o</sup>, 30<sup>o</sup>, 45<sup>o</sup>, and 60<sup>o</sup>. We concluded that the jets intersection angle is having a bearing on the time and location of the maximum wall-heat flux zone of the liquid rocket combustion chamber during the start-up transient. We also concluded that the wall heat flux mapping in liquid rocket combustion chamber during the start-up transient is a meaningful objective for the chamber wall material selection and the lucrative design optimization of the combustion chamber for improving the payload capability of the rocket.   <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=combustion%20chamber" title="combustion chamber">combustion chamber</a>, <a href="https://publications.waset.org/abstracts/search?q=injector" title=" injector"> injector</a>, <a href="https://publications.waset.org/abstracts/search?q=liquid%20rocket" title=" liquid rocket"> liquid rocket</a>, <a href="https://publications.waset.org/abstracts/search?q=rocket%20engine%20wall%20heat%20flux" title=" rocket engine wall heat flux"> rocket engine wall heat flux</a> </p> <a href="https://publications.waset.org/abstracts/62084/wall-heat-flux-mapping-in-liquid-rocket-combustion-chamber-with-different-jet-impingement-angles" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/62084.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">487</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">1343</span> Research on the Aero-Heating Prediction Based on Hybrid Meshes and Hybrid Schemes</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Qiming%20Zhang">Qiming Zhang</a>, <a href="https://publications.waset.org/abstracts/search?q=Youda%20Ye"> Youda Ye</a>, <a href="https://publications.waset.org/abstracts/search?q=Qinxue%20Jiang"> Qinxue Jiang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Accurate prediction of external flowfield and aero-heating at the wall of hypersonic vehicle is very crucial for the design of aircrafts. Unstructured/hybrid meshes have more powerful advantages than structured meshes in terms of pre-processing, parallel computing and mesh adaptation, so it is imperative to develop high-resolution numerical methods for the calculation of aerothermal environment on unstructured/hybrid meshes. The inviscid flux scheme is one of the most important factors affecting the accuracy of unstructured/ hybrid mesh heat flux calculation. Here, a new hybrid flux scheme is developed and the approach of interface type selection is proposed: i.e. 1) using the exact Riemann scheme solution to calculate the flux on the faces parallel to the wall; 2) employing Sterger-Warming (S-W) scheme to improve the stability of the numerical scheme in other interfaces. The results of the heat flux fit the one observed experimentally and have little dependence on grids, which show great application prospect in unstructured/ hybrid mesh. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aero-heating%20prediction" title="aero-heating prediction">aero-heating prediction</a>, <a href="https://publications.waset.org/abstracts/search?q=computational%20fluid%20dynamics" title=" computational fluid dynamics"> computational fluid dynamics</a>, <a href="https://publications.waset.org/abstracts/search?q=hybrid%20meshes" title=" hybrid meshes"> hybrid meshes</a>, <a href="https://publications.waset.org/abstracts/search?q=hybrid%20schemes" title=" hybrid schemes"> hybrid schemes</a> </p> <a href="https://publications.waset.org/abstracts/120061/research-on-the-aero-heating-prediction-based-on-hybrid-meshes-and-hybrid-schemes" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/120061.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">248</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">1342</span> Reconstruction of a Genome-Scale Metabolic Model to Simulate Uncoupled Growth of Zymomonas mobilis</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Maryam%20Saeidi">Maryam Saeidi</a>, <a href="https://publications.waset.org/abstracts/search?q=Ehsan%20Motamedian"> Ehsan Motamedian</a>, <a href="https://publications.waset.org/abstracts/search?q=Seyed%20Abbas%20Shojaosadati"> Seyed Abbas Shojaosadati</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Zymomonas mobilis is known as an example of the uncoupled growth phenomenon. This microorganism also has a unique metabolism that degrades glucose by the Entner–Doudoroff (ED) pathway. In this paper, a genome-scale metabolic model including 434 genes, 757 reactions and 691 metabolites was reconstructed to simulate uncoupled growth and study its effect on flux distribution in the central metabolism. The model properly predicted that ATPase was activated in experimental growth yields of Z. mobilis. Flux distribution obtained from model indicates that the major carbon flux passed through ED pathway that resulted in the production of ethanol. Small amounts of carbon source were entered into pentose phosphate pathway and TCA cycle to produce biomass precursors. Predicted flux distribution was in good agreement with experimental data. The model results also indicated that Z. mobilis metabolism is able to produce biomass with maximum growth yield of 123.7 g (mol glucose)-1 if ATP synthase is coupled with growth and produces 82 mmol ATP gDCW-1h-1. Coupling the growth and energy reduced ethanol secretion and changed the flux distribution to produce biomass precursors. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=genome-scale%20metabolic%20model" title="genome-scale metabolic model">genome-scale metabolic model</a>, <a href="https://publications.waset.org/abstracts/search?q=Zymomonas%20mobilis" title=" Zymomonas mobilis"> Zymomonas mobilis</a>, <a href="https://publications.waset.org/abstracts/search?q=uncoupled%20growth" title=" uncoupled growth"> uncoupled growth</a>, <a href="https://publications.waset.org/abstracts/search?q=flux%20distribution" title=" flux distribution"> flux distribution</a>, <a href="https://publications.waset.org/abstracts/search?q=ATP%20dissipation" title=" ATP dissipation"> ATP dissipation</a> </p> <a href="https://publications.waset.org/abstracts/15686/reconstruction-of-a-genome-scale-metabolic-model-to-simulate-uncoupled-growth-of-zymomonas-mobilis" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15686.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">486</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">1341</span> Enrichment and Flux of Heavy Metals along the Coastal Sediments of Pakistan</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Asmat%20Siddiqui">Asmat Siddiqui</a>, <a href="https://publications.waset.org/abstracts/search?q=Noor%20Us%20Saher"> Noor Us Saher</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Heavy metal contamination in the marine environment is a global issue, and in past decades, this problem has intensified due to an increase in urbanization and industrialization, especially in developing countries. Marine sediments act as a preliminary indicator of heavy metal contamination in the coastal and estuarine environment, which has adverse effects on biota as well as in the marine system. The aim of the current study was to evaluate the contamination status, enrichment, and flux of heavy metals in two monitoring years from coastal sediments of Pakistan. A total of 74 sediment samples were collected from seven coastal areas of Pakistan in two monitoring years, 2001-03 (MY-I) and 2011-13 (MY-II). The geochemical properties (grain size analysis, organic contents and eight heavy metals, i.e. Fe, Zn, Cu, Cr, Ni, Co, Pb, and Cd) of all sediment samples were analyzed. A significant increase in Fe, Ni and Cr concentrations detected between the years, whereas no significant differences were exhibited in Cu, Zn, Co, Pb and Cd concentrations. The extremely high enrichment (>50) of Cu, Zn, Pb and Cd were scrutinized in both monitoring years. The annual deposition flux of heavy metals ranged from 0.63 to 66.44 and 0.78 to 68.27 tons per year in MY-I and MY-II, respectively, with the lowest flux evaluated for Cd and highest for Zn in both monitoring years. A significant increase (p <0.05) was observed in the burial flux of Cr and Ni during the last decade in coastal sediments. The use of geo-indicators is helpful to assess the contamination analysis for management and conservation of the marine environment. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=coastal%20contamination" title="coastal contamination">coastal contamination</a>, <a href="https://publications.waset.org/abstracts/search?q=enrichment%20factor" title=" enrichment factor"> enrichment factor</a>, <a href="https://publications.waset.org/abstracts/search?q=geo-indicator" title=" geo-indicator"> geo-indicator</a>, <a href="https://publications.waset.org/abstracts/search?q=heavy%20metal%20flux" title=" heavy metal flux"> heavy metal flux</a> </p> <a href="https://publications.waset.org/abstracts/69834/enrichment-and-flux-of-heavy-metals-along-the-coastal-sediments-of-pakistan" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/69834.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">379</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">1340</span> Effect of Drag Coefficient Models concerning Global Air-Sea Momentum Flux in Broad Wind Range including Extreme Wind Speeds</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Takeshi%20Takemoto">Takeshi Takemoto</a>, <a href="https://publications.waset.org/abstracts/search?q=Naoya%20Suzuki"> Naoya Suzuki</a>, <a href="https://publications.waset.org/abstracts/search?q=Naohisa%20Takagaki"> Naohisa Takagaki</a>, <a href="https://publications.waset.org/abstracts/search?q=Satoru%20Komori"> Satoru Komori</a>, <a href="https://publications.waset.org/abstracts/search?q=Masako%20Terui"> Masako Terui</a>, <a href="https://publications.waset.org/abstracts/search?q=George%20Truscott"> George Truscott</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Drag coefficient is an important parameter in order to correctly estimate the air-sea momentum flux. However, The parameterization of the drag coefficient hasn’t been established due to the variation in the field data. Instead, a number of drag coefficient model formulae have been proposed, even though almost all these models haven’t discussed the extreme wind speed range. With regards to such models, it is unclear how the drag coefficient changes in the extreme wind speed range as the wind speed increased. In this study, we investigated the effect of the drag coefficient models concerning the air-sea momentum flux in the extreme wind range on a global scale, comparing two different drag coefficient models. Interestingly, one model didn’t discuss the extreme wind speed range while the other model considered it. We found that the difference of the models in the annual global air-sea momentum flux was small because the occurrence frequency of strong wind was approximately 1% with a wind speed of 20m/s or more. However, we also discovered that the difference of the models was shown in the middle latitude where the annual mean air-sea momentum flux was large and the occurrence frequency of strong wind was high. In addition, the estimated data showed that the difference of the models in the drag coefficient was large in the extreme wind speed range and that the largest difference became 23% with a wind speed of 35m/s or more. These results clearly show that the difference of the two models concerning the drag coefficient has a significant impact on the estimation of a regional air-sea momentum flux in an extreme wind speed range such as that seen in a tropical cyclone environment. Furthermore, we estimated each air-sea momentum flux using several kinds of drag coefficient models. We will also provide data from an observation tower and result from CFD (Computational Fluid Dynamics) concerning the influence of wind flow at and around the place. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=air-sea%20interaction" title="air-sea interaction">air-sea interaction</a>, <a href="https://publications.waset.org/abstracts/search?q=drag%20coefficient" title=" drag coefficient"> drag coefficient</a>, <a href="https://publications.waset.org/abstracts/search?q=air-sea%20momentum%20flux" title=" air-sea momentum flux"> air-sea momentum flux</a>, <a href="https://publications.waset.org/abstracts/search?q=CFD%20%28Computational%20Fluid%20Dynamics%29" title=" CFD (Computational Fluid Dynamics)"> CFD (Computational Fluid Dynamics)</a> </p> <a href="https://publications.waset.org/abstracts/41397/effect-of-drag-coefficient-models-concerning-global-air-sea-momentum-flux-in-broad-wind-range-including-extreme-wind-speeds" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/41397.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">371</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">1339</span> Water Reclamation from Synthetic Winery Wastewater Using a Fertiliser Drawn Forward Osmosis System Evaluating Aquaporin-Based Biomimetic and Cellulose Triacetate Forward Osmosis Membranes</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Robyn%20Augustine">Robyn Augustine</a>, <a href="https://publications.waset.org/abstracts/search?q=Irena%20Petrinic"> Irena Petrinic</a>, <a href="https://publications.waset.org/abstracts/search?q=Claus%20Helix-Nielsen"> Claus Helix-Nielsen</a>, <a href="https://publications.waset.org/abstracts/search?q=Marshall%20S.%20Sheldon"> Marshall S. Sheldon</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This study examined the performance of two commercial forward osmosis (FO) membranes; an aquaporin (AQP) based biomimetic membrane, and cellulose triacetate (CTA) membrane in a fertiliser is drawn forward osmosis (FDFO) system for the reclamation of water from synthetic winery wastewater (SWW) operated over 24 hr. Straight, 1 M KCl and 1 M NH₄NO₃ fertiliser solutions were evaluated as draw solutions in the FDFO system. The performance of the AQP-based biomimetic and CTA FO membranes were evaluated in terms of permeate water flux (Jw), reverse solute flux (Js) and percentage water recovery (Re). The average water flux and reverse solute flux when using 1 M KCl as a draw solution against controlled feed solution, deionised (DI) water, was 11.65 L/m²h and 3.98 g/m²h (AQP) and 6.24 L/m²h and 2.89 g/m²h (CTA), respectively. Using 1 M NH₄NO₃ as a draw solution yielded average water fluxes and reverse solute fluxes of 10.73 L/m²h and 1.31 g/m²h (AQP) and 5.84 L/m²h and 1.39 g/m²h (CTA), respectively. When using SWW as the feed solution and 1 M KCl and 1 M NH₄NO₃ as draw solutions, respectively, the average water fluxes observed were 8.15 and 9.66 L/m²h (AQP) and 5.02 and 5.65 L/m²h (CTA). Membrane water flux decline was the result of a combined decrease in the effective driving force of the FDFO system, reverse solute flux and organic fouling. Permeate water flux recoveries of between 84-98%, and 83-89% were observed for the AQP-based biomimetic and CTA membrane, respectively after physical cleaning by flushing was employed. The highest water recovery rate of 49% was observed for the 1 M KCl fertiliser draw solution with AQP-based biomimetic membrane and proved superior in the reclamation of water from SWW. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=aquaporin%20biomimetic%20membrane" title="aquaporin biomimetic membrane">aquaporin biomimetic membrane</a>, <a href="https://publications.waset.org/abstracts/search?q=cellulose%20triacetate%20membrane" title=" cellulose triacetate membrane"> cellulose triacetate membrane</a>, <a href="https://publications.waset.org/abstracts/search?q=forward%20osmosis" title=" forward osmosis"> forward osmosis</a>, <a href="https://publications.waset.org/abstracts/search?q=reverse%20solute%20flux" title=" reverse solute flux"> reverse solute flux</a>, <a href="https://publications.waset.org/abstracts/search?q=synthetic%20winery%20wastewater%20and%20water%20flux" title=" synthetic winery wastewater and water flux"> synthetic winery wastewater and water flux</a> </p> <a href="https://publications.waset.org/abstracts/101157/water-reclamation-from-synthetic-winery-wastewater-using-a-fertiliser-drawn-forward-osmosis-system-evaluating-aquaporin-based-biomimetic-and-cellulose-triacetate-forward-osmosis-membranes" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/101157.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">165</span> </span> </div> </div> <ul class="pagination"> <li class="page-item disabled"><span class="page-link">&lsaquo;</span></li> <li class="page-item active"><span class="page-link">1</span></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=flux%20barrier&page=2">2</a></li> <li class="page-item"><a class="page-link" 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