Dissertations / Theses on the topic 'Shafran'
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Bailey, Fiona Jane, and mikewood@deakin edu au. "The origins of inflated responsibility in obsessive compulsive disorder." Deakin University. School of Psychology, 2002. http://tux.lib.deakin.edu.au./adt-VDU/public/adt-VDU20050902.121410.
Full textBonorino, Leonardo Prange. "Formulação variacional da equação de Grad-Shafranov." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 1993. http://hdl.handle.net/10183/127009.
Full textIn this work we study a variational formulation to the Grad-Shafranov equation in an open and bounded set n C 1R n. First we establish a relationship between the variational formulation anel the original equation. Then, according to P. Laurence and \V. Stredulinsky we prove that the functional of this formulation attains a. minimum (supposedly the solution of the original problem) a.nd this minimum has some characteristics of regularity. For the case of n convex, we introduce a kind of discretisation due to the above mentioned authors. We finally establish some important geometric properties of the solution of the discretised problem.
Skan, Moa. "Reconstructing ICMEs with the toroidal Grad-Shafranov method." Thesis, Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-382398.
Full textSa, Wanderley Pires de. "Reconstrução do equilíbrio no tokamak TCA/BR." Universidade de São Paulo, 1996. http://www.teses.usp.br/teses/disponiveis/43/43131/tde-12122013-162240/.
Full textThe accurate and rapid determination of the Magnetohydrodynamic (MHD) equilibrium configuration in tokamaks is a fundamental subject for the magnetic confinement of the plasma. With the knowledge of characteristic plasma MHD equilibrium parameters it is possible to control the plasma position during its formation using feed-back techniques. It is also necessary an on-line analysis between successive discharges to program external parameters for the subsequent discharges. In this work it is investigated the MHD equilibrium configuration reconstruction of the TCA/BR tokamak from external magnetic measurements, using a method that is able to determine fastly the main parameters of discharge. The thesis has two parts. Firstly it is presented the development of an equilibrium co de that solves de Grad-Shafranov equation for the TCA/BR tokamak geometry. Secondly it is presented the MHD equilibrium reconstruction process from external magnetic field and flux measurements using the Function Parametrization FP method. This method is based on the statistical analysis of a database of simulated equilibrium configurations, with the goal of obtaining a simple relationship between the parameters that characterize the equilibrium and the measurements. The results from FP are compared with conventional methods.
Gourdain, Pierre-Alexandre. "Résolution de l'équilibre axisymétrique de MHD idéale avec frontière libre en utilisant un principe variationnal." Ecully, Ecole centrale de Lyon, 2001. http://www.theses.fr/2001ECDL0033.
Full textThis work presents a unique method to solve the Grad-Shafranov equation for an ideal axisymmetric MHD equilibrium with free boundary. This problem is solved in an orthogonal flux space reducing the Grad-Shafranov equation to a Laplacian which allows to use a variationnal principle to obtain the solution. The mesh is a set of flux lines which are deformed until they all rest in equilibrium. The free boundary is treated using an error minimization based on Newton-Raphson algorithm which moves the boundary until the flux is constant along it. The coupling of these two medhods gives really quick and precise equilibriums for all sorts of fluid shapes and pressures
Shafak, Kemal Verfasser], and Franz X. [Akademischer Betreuer] [Kärtner. "Large-Scale Laser-Microwave Synchronization for Attosecond Photon Science Facilities / Kemal Shafak ; Betreuer: Franz Kärtner." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://d-nb.info/1133262112/34.
Full textShafak, Kemal [Verfasser], and Franz X. [Akademischer Betreuer] Kärtner. "Large-Scale Laser-Microwave Synchronization for Attosecond Photon Science Facilities / Kemal Shafak ; Betreuer: Franz Kärtner." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://nbn-resolving.de/urn:nbn:de:gbv:18-85229.
Full textChaudhry, Shafqat Rasul [Verfasser]. "Investigation of systemic inflammation in aneurysmal subarachnoid hemorrhage (aSAH) and its impact on post-aSAH complications / Shafqat Rasul Chaudhry." Bonn : Universitäts- und Landesbibliothek Bonn, 2018. http://d-nb.info/1161462317/34.
Full textHussain, Shafqat [Verfasser], Stefan [Akademischer Betreuer] Turek, and Friedhelm [Gutachter] Schieweck. "Numerical analysis of new class of higher order Galerkin time discretization schemes for nonstationary incompressible flow problems / Shafqat Hussain. Betreuer: Stefan Turek. Gutachter: Friedhelm Schieweck." Dortmund : Universitätsbibliothek Dortmund, 2012. http://d-nb.info/1107777445/34.
Full textRahim, Shafqat. "Evalution of VOD by using MPLS network." Thesis, Blekinge Tekniska Högskola, Avdelningen för telekommunikationssystem, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-1225.
Full text+4917681112914 you can conatct me on this number.
Elarif, Ali Aboudou. "Approximation par éléments finis C1 des modèles magnétohydrodynamiques pour les plasmas de fusion." Thesis, Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ4108.
Full textThis thesis participates in the development of advanced numerical methods to simulate plasma instabilities for fusion by magnetic confinement in tokamaks. These flows are described in a general framework by magnetohydrodynamic(MHD) fluid models and can be considered incompressible in some approximations known as reduced MHD models. In this work, the incompressibility constraint is dealt with by the introduction of stream functions. A consequence of this formulation is the appearence of differential terms of order 4 in the equations. The use of C 1 functions is then required to apply the conforming Galerkin finite element method. We have used the the so-called reduced Clough-Tocher(CT) finite element method on general triangulations. The method has been validated on simple problems and then extented to problems relevant for the study of fusion plasmas. First, plasma equilibrium described by the Grad-Shafranov equation, has been investigated. Then we have studied incompressible models in a pure streamfunction formulation. First, we introduced a discretization of the incompressible Navier-Stokes equations which constitute a sub-model of the incompressible MHD equations. We have shown the stability in energy of the method and demontrated its performance on some standard test cases. We have then extended this numerical scheme to the incompressible MHD equations. We have also proved the stability in energy of the numerical approach and applied the numerical scheme to the simulation of the well known "tilt instability". In view of the results obtained, the CT method appears to be suitable for the simulation of plasma instabilities described by MHD models. Due to its capability to represent complex geometry, it compares favorably to other numerical methods in term of accuracy, CPU time, memory cost and versatility. jfavorably to other numerical methods in term of accuracy, CPU time, memory cost and versatility
Adam, Sibyl Alexandra. "Affective everyday in narratives of Muslim women migrating to the UK, 1906-2012." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31548.
Full textWu, Yen-Lin, and 吳彥霖. "On the Positive Solution for Grad-Shafranov Equation." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/31510488934069707351.
Full text國立中央大學
數學研究所
97
In this thesis, we consider a new type of Grad-Shafranov equation : $$displaystyle Delta u=Big(1+frac{cu}{kappa}Big)^{-kappa+frac{1}{2}} $$ arising from the plasma physics (see Ref. cite{HF1} and cite{HF2} by L.-N. Hau and W.-Z. Fu). Using the method of regular perturbation, we investigate the limiting behavior of positive solutions (for 1D case) with respect to the parameter Kappa $kappa$ (as $kappa o infty$). In addition, the global existence, uniqueness and asymptotic behavior of positive radial solutions will be proved as well.
Karim, Shafqat [Verfasser]. "Fabrication and characterization of gold nanowires / vorgelegt von Shafqat Karim." 2007. http://d-nb.info/985317124/34.
Full textShafaq, Saba [Verfasser]. "Flavor physics and right handed models / vorgelegt von Saba Shafaq." 2010. http://d-nb.info/1008727091/34.
Full textTeh, Wai-Leong, and 鄭偉良. "A Study of Two-Dimensional Magnetopause Structure Based on Grad-Shafranov Reconstruction Method." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/09085678302427737235.
Full text國立中央大學
太空科學研究所
95
Grad-Shafranov (GS) reconstruction technique is a data analysis tool for reconstruction of two-dimensional (2D) coherent field structures from data taken by single satellite traversing a current layer by solving the GS equation as a spatial initial value problem. For magnetohydrostatic approximation, the GS reconstruction technique has been developed by Hau and Sonnerup [1999] and successfully applied to the Earth’s magnetopause, to the magnetic cloud in the solar wind, and to the flux rope by various authors. In previous studies based on the analysis of AMPTE/IRM and Cluster data, the magnetopause current layers of tangential-discontinuity type are found to be imbedded with a string of magnetic islands moving down the magnetotail. In this thesis, we first present a rare event of triple magnetopause crossings encountered by AMPTE/IRM using the similar magnetohydrostatic GS construction method that shows similar features of magnetic islands embedded within the overall tangential discontinuity-like current layer. Detailed analyses of the magnetopause normal orientation, the deHoffmann-Teller (HT) velocity, and the invariant axis indicate that these are likely to be part of the same magnetopause structures moving inward and outward seen by the same spacecraft. The thesis also presents the first new results from a recently developed version of GS reconstruction in the presence of field-aligned flow based on the formulation of Sonnerup et al. [2006] that can be applied to rotational discontinuity-like magnetopause current layer structures. A new GS solver that incorporates the field-aligned flow is benchmarked with an exact analytical solution to demonstrate the accuracy of the new GS reconstruction scheme. It is then applied to the magnetopause crossings by the AMPTE/IRM on September 15, 1984, and by the Cluster 1 (C1) and the Cluster 3 (C3) on July 5, 2001. In the AMPTE/IRM event, the reconstructed magnetic field map shows that the magnetopause current layer becomes thinner than that recovered from the magnetohydrostatic reconstruction, an effect due to the presence of field-aligned flow [Hau, 1996]. For the Cluster event, the agreement between map-predicted and measured values of the field-line invariants along the trajectory of the spacecraft not used in generating the map is less than perfect but most of the differences are accounted by the time evolutionary effect due to developing reconnection at a site close to the spacecraft. An important new feature is that the field-aligned flow, as seen in the HT frame, is supersonic in the magnetopause region and is qualitatively and quantitatively as expected for supersonic flow in a duct (a flux tube). We provide an estimate of 0.47 mV/m for the reconnection electric field.
Ibrahim, Ibtisam. "Israel's "ethnic project" in the city of Shafa-amr : particularization of identity along religious lines /." 2000. http://www.library.wisc.edu/databases/connect/dissertations.html.
Full textShafaa, Medhat Wahba Ismail [Verfasser]. "Incorporation of lutein and zeaxanthin into membranes in comparison to other carotenoids and under consideration of their abundance in retinal epithelial cells / by Medhat Wahba Ismail Shafaa." 2005. http://d-nb.info/975532855/34.
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