Dissertations / Theses on the topic 'Median algebra'
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Messaci, Mohamed Lamine. "Espaces médians." Electronic Thesis or Diss., Université Côte d'Azur, 2023. http://www.theses.fr/2023COAZ4119.
Full textThe subject of this thesis are median spaces and the main direction concerns the study of isometric actions on complete connected locally compact median space of finite rank. We first give a characterization of the local compactness in this context. Then we give a classification theorem in this class for median spaces which admit a transitive action. We show that such median spaces are necessarily isometric to mathbb{R}^n endowed with the ell^1 metric. Finally, we prove that when the isometry group of a median space X verifies certain conditions, then the orbits of any action on X is discrete
Wagner, Ingo. "Algebraic approach towards conductivity in ergodic media." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-164715.
Full textTorp, Audun. "Sparse linear algebra on a GPU : with Applications to flow in porous Media." Thesis, Norwegian University of Science and Technology, Department of Mathematical Sciences, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9044.
Full textWe investigate what the graphics processing units (GPUs) have to offer compared to the central processing units (CPUs) when solving a sparse linear system of equations. This is performed by using a GPU to simulate fluid-flow in a porous medium. Flow-problems are discretized mainly by the mimetic finite element discretization, but also by a two-point flux-approximation (TPFA) method. Both of these discretization schemes are explained in detail. Example-models of flow in porous media are simulated, as well as CO2 -injection into a realistic model of a sub-sea storage-cite. The linear algebra is solved by the conjugate gradient (CG) method without a preconditioner. The computationally most expensive calculation of this algorithm is the matrix-vector product. Several formats for storing sparse matrices are presented and implemented on both a CPU and a GPU. The fastest format on the CPU is different from the format performing best on the GPU. Implementations for the GPU is written for the compute unified driver architecture (CUDA), and C++ is used for the CPU-implementations. The program is created as a plug-in for Matlab and may be used to solve any symmetric positive definite (SPD) linear system. How a GPU differs from a CPU is explained, where focus is put on how a program should be written to fully utilize the potential of a GPU. The optimized implementation on the GPU outperforms the CPU, and offers a substantial improvement compared to Matlabs conjugate gradient method, when no preconditioner is used.
Szydlarski, Mikolaj. "Algebraic Domain Decomposition Methods for Darcy flow in heterogeneous media." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2010. http://tel.archives-ouvertes.fr/tel-00550728.
Full textCedillo, Ávalos Tenoch Esaú. "Exploring algebra as a language-in-use : a study with 11-12 year olds using graphic calculators." Thesis, University College London (University of London), 1997. http://discovery.ucl.ac.uk/10021709/.
Full textKluge, Oliver. "Entwicklung einer Programmierumgebung für die Parallelverarbeitung in der Computer-Algebra /." Stuttgart : Teubner, 1997. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=007408339&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textWagner, Ingo [Verfasser], and Peter [Akademischer Betreuer] Müller. "Algebraic approach towards conductivity in ergodic media / Ingo Wagner. Betreuer: Peter Müller." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1046503367/34.
Full textAubriot, Thomas. "Classification des objets galoisiens d'une algèbre de Hopf /." Strasbourg : IRMA, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016604722&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textDonevska-Todorova, Ana. "Utilizing Technology to Facilitate the Transition from Secondary- to Tertiary Level Linear Algebra." Doctoral thesis, Humboldt-Universität zu Berlin, 2017. http://dx.doi.org/10.18452/18561.
Full textA common perception among researchers in mathematics education is that the transition between secondary- and tertiary level of mathematics may be problematic for the students. In particular, the exact and abstract nature of the theory of Linear algebra versus its arithmetic-geometric presentation in school appears to be difficult for the novice students. The application of properties for defining concepts at university in contrast to their usage for describing concepts in school points out a possible occurrence of obstacles for learning and discrepancies in procedural and conceptual understanding. The aim of this study is to examine how could upper-high school students develop a conceptual understanding based on concept definition and concept image in connection to multiple modes of description and thinking about concepts such as bi-linearity exemplified by the dot product of vectors and multi-linearity exemplified by determinants. In order to achieve this, I have created a specific teaching/ learning sequence in a dynamic geometry environment (DGE), then implemented it and evaluated it in a high school in Berlin, following a complete cycle of design-based research and conducting a multiple-level data analysis. The findings of the study show not only that widening students' concept images, developing multiple modes of thinking and gaining deeper conceptual understanding can successfully be mediated by dynamic geometries, but also give insights into an eventual theoretical model of how can they be further examined. Moreover, the study promotes authorized open-source interactive teaching/ learning materials for further sustainable practice and research. It opens new research questions about revisiting axiomatic approaches on local levels in upper high-school Linear algebra which may base on the integration of all three modes of description and thinking geometric, algebraic and abstract possibly facilitated by DGE.
Честа перцепција кај многумина истражувачи во областа на математичкото образование е дека транзицијата помеѓу средното и високото образование по математика може да биде проблематична за студентите. Егзакноста и апстрактноста на теоријата по Линеарна алгебра наспроти нејзината аритметичко-геометриска презентација во средното гимназиско образование се покажува како особено тешка за студентите. Примена на својствата на математичките поими за нивно дефинирање на универзитетско ниво наспроти нивното употреба за опишување на претходно дефинирани поими на училишно ниво, укажува на можна појава на тешкотии при нивното изучување и несовпаѓање на процедуралното и концептуалното разбирање на истите. Целта на оваа студија е да истражи како средношколците би можеле да развијат концептуално разбирање на поимите врз основа на концепт дефиниција и концепт слика во врска со мулти-моди на мислење, конкретно за поими како билинеарност, пр. скаларен производ на вектори, и мултилинеарност, пр. детерминанти. За да ја постигнам оваа цел, креирав наставна содржина поддржана од еден динамичен геометриски систем (ДГС) и следејќи целосен циклус на т.н. design-based research и спрoведувајќи мулти-анализа на податоци, истата ја имплементирав и евалуирав во едно средно училиште во Берлин. Резултатите од студијата укажуваат не само на фактот дека проширувањето на концепт сликите на учениците, развојот на мулти-моди на мислење и стекнувањето на длабоко концептуално разбирање на поимите можат да бидат успешно посредувани од ДГС туку овозможија и увид во еден теоретски модел за тоа коко тие можат понатаму да се истражуваат. Уште повеќе, студијата промовира авторизирани open-source интерактивни материјали за предавање и учење на содржините кои може да служат за понатамошни одржливи истражувања и развој. Студијата отвора нови истражувачки прашања за средношколската Линеарна алгебра која може да се базира на интеграција на сите три моди на мислење, геометриски, алгебарски и апстрактен, поддржан од ДГС.
Vilchez, Manuel. "An Investigation of the Effect of Using Twitter by High School Mathematics Students Learning Linear Equations in Algebra 1." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2460.
Full textFaisal, Saadia. "Discrete-time modelling of gene networks by Zhegalkin Polynomials /." München : Verl. Dr. Hut, 2009. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=017548696&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textPostel, Frank. "Ein Beitrag zur Entwicklung wissensbasierter mathematischer Lernsysteme : Software-Komponenten und deren Anbindung an das Expertenmodul eines tutoriellen Lernsystems zur Algebra der Sekundarstufe I /." Berlin : Logos-Verl, 2001. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=009621537&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textCallegaro, Filippo. "Cohomology of finite and affine type Artin groups over Abelian representation /." Pisa, Italy : Edizioni della normale, 2009. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=017728632&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textScheuermann, Hellmut. "Computereinsatz im anwendungsorientierten Analysisunterricht : Entwicklung von anwendungsbezogenen Aufgaben für den computerunterstützten Analysisunterricht in der Fachoberschule und Erfahrungen beim unterrichtlichen Einsatz unter Verwendung des Computer-Algebra-Systems DERIVE /." Hildesheim : Franzbecker, 1998. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=007992569&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textLee, Hee ryung. "Studies of scattering and anisotropic media with Mueller polarimetry : towards digital histology and optical biopsy of tissue." Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX085.
Full textImaging Mueller polarimetry represents an emerging optical technique for a non-invasive diagnostics of tissue. This optical modality explores the extreme sensitivity of polarized light to the microstructure of a sample under study and provides the most complete information on sample polarimetric properties.First, the potential of the transmission Mueller microscope operating in the visible wavelength range for digital histology analysis was studied on the unstained histological sections of human skin equivalents. Logarithmic decomposition of the experimental Mueller matrices was combined with the statistical density-based clustering algorithm for the applications with noise (DBSCAN) for diagnostic segmentation of the microscope images of human skin models. The validity of the differential Mueller matrix formalism for fluctuating homogenous depolarizing media was confirmed experimentally for biological tissue. An original method was suggested to mitigate the impact of thickness variation that could affect the accuracy of polarimetric diagnostics of thin tissue sections. A new version of the DBSCAN algorithm was developed to reduce the calculation time and, thus, to allow clustering of large size datasets. When dataset outliers (noise) were effectively filtered out, the contrast between the dermal and epidermal zones of human skin equivalents was significantly increased. Polarized Monte Carlo modeling of the experimental Mueller matrices of thin sections of human skin equivalents confirmed that both linear dichroism and anisotropy of depolarization detected within the dermal zone are due to the presence of well-aligned collagen fibers.The ex-vivo proof-of-principle studies of the sensitivity of backscattered polarized light to the highly ordered structure of healthy brain white matter are presented in the second part. The thick sections of the formalin-fixed human brain and fresh calf brain were imaged in reflection configuration using wide-field imaging Mueller polarimeter operating in the visible wavelength range. It is known that brain tumors break the highly ordered structure of brain white matter because tumor cells grow in a chaotic way. However, this difference in structural complexity is hardly detectable with a state-of-the-art operative microscope during neurosurgery because of low visual contrast between tumor and healthy brain tissue. We studied the capability of the wide-field imaging Mueller polarimetry to visualize the fiber tracts of healthy brain white matter by detecting the anisotropy of its refractive index (i.e. birefringence of brain white matter that will be erased by tumor). The experimental Mueller matrices of brain specimens were processed using the algorithm of Lu-Chipman polar decomposition. The maps of the azimuth of the optical axis of uniaxial linear birefringent medium demonstrated the compelling correlation with the microscopy images of silver-stained histological sections of brain tissue that is a gold standard technique for the visualization of brain white matter fiber tracts ex-vivo. These results show the potential of wide-field imaging Mueller polarimetry to provide information on the relative spatial orientation of brain fiber tracts, which can help to detect the exact border between the tumor and surrounding brain tissue, guide neurosurgeon during tumor resection and improve patient outcomes
Brinkmann, Christoph. "Die Andersonextension und 1-Motive." Bonn : Die Rheinische Friedrich-Wilhelms-Universität, 1991. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=003517322&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textAtkins, Michael. "Reflections of Revolution: Le Figaro, Le Monde, and Public Opinion in France during the Algerian Conflict (1954-1962)." Thesis, University of North Texas, 2002. https://digital.library.unt.edu/ark:/67531/metadc3360/.
Full textShen, Chong. "Topic Analysis of Tweets on the European Refugee Crisis Using Non-negative Matrix Factorization." Scholarship @ Claremont, 2016. http://scholarship.claremont.edu/cmc_theses/1388.
Full textVenancio, Rafael Duarte Oliveira. "Jogo lógico e a gramática do rádio: analítica de um jogo de linguagem comunicacional e seus diferendos." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/27/27161/tde-06052014-150241/.
Full textThe present work aims to understand how the radio distinguishes itself from other sounds of the world. The hypothesis formulated here is that the radio, in its definition, is a language, not a machine. Thus, there is the search for a characterization of radio\'s language following the ideas involved in an Aesthetics of Language (Derrida and anti-essentialists like Ziff, Weitz and Kennick). Here, there is a detailed study of the radio in its language-game (Wittgenstein) and their differends (Lyotard), considered in this work as parergon and ergon, i.e. as the cut and the operational model of language in its intersection with the world. For the investigation of the language-game, we used content related to Analytic Philosophy, to Algebraic Logic, and to Game Theory to develop an analytical method called Logic Game, dedicated to the communicative language-games\' study. As for the investigation of differends, we used the pragmatic concepts about the performative and illocutionary logic (Searle and Austin) to analyze the radio genres (ie: music, radio journalism, sports, talk radio, humor, fiction and advertising). These two studies form what is called here the Radio Grammar - considering the Wittgensteinian concept of grammar - the key point that allows us to characterize the radio as a language.
Lopes, Tuane Vanessa. "Simulação numérica tridimensional para escoamentos em reservatórios de petróleo heterogêneos." Laboratório Nacional de Computação Científica, 2012. http://www.lncc.br/tdmc/tde_busca/arquivo.php?codArquivo=243.
Full textMultiphase flows in porous media are modeled by a system of partial differential equations and the study of the numerical approximation to the solutions of these plays a crucial role in the simulation and prediction of problems that are of great practical interest and of economic and social impact, such as secondary oil recovery, geological storage of CO2 and transport of pollutants in aquifers. The goal of this work is the development of a three-dimensional numerical simulator that precisely evaluates the transport of two immiscible fluids in a heterogeneous porous media using multithread parallel programming to shared memory multiprocessors computers. The system of partial differential equations is decomposed into a elliptic subsystem used to determine the velocity field and into a hyperbolic equation (nonlinear) to determine the transport of the fluid phases. The approximation to the solution of the latter one is calculated using a high order non-oscillatory finite-differences numerical method based on central schemes that allows a semi-discrete formulation which an extension that enables to work with variable space coefficients. Numerical experiments on three-dimensional models were performed considering linear and nonlinear flow problems in typical settings of oil reservoirs simulations. The results were satisfactory since they presented mass conservation, precise capture of shock waves and small numeric diffusion, regardless of the time step.
Steiniger, Holger. "On the structure of Fourier algebras and certain Beurling algebras /." 1998. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=008720288&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full textKussin, Dirk. "Graduierte Faktorialität und die Parameterkurven tubularer Familien /." 1997. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=007937066&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full text""I'm not the cause of the problem; simply a consequence of it": Media Narratives, Homegrown Radicalization, and Postcolonial Legacy in Contemporary France." Tulane University, 2017.
Find full textThis essay seeks a more robust understanding of the ways in which domestic Islamic radicalization is presented and discussed in the French public sphere. It illuminates the ways in which the print media across the political spectrum has taken a historical amnesic approach to representing the causes and origins of domestic radicalization, neglecting to convey the significant postcolonial and neocolonial dimensions, and instead employing a selective and misrepresentative discourse that over-simplifies the crucial dynamics of the issue. In doing so, it not only explores the communicative frameworks of a phenomenon that in recent years has come to the forefront of national security issues, but also comments on the larger socio-political trends that have led to such a unified approach to emerge across the political spectrum of France’s otherwise pluralistic press landscape. Analyzing the period between 1995 and the present day, this essay draws from the archives of three major newspapers in France (Le Monde, Le Figaro, and Libération) and focuses on three major incidents of domestic Islamic radicalization to examine the methods by and reasons why newspapers across the political spectrum represent the dynamics and causes of domestic Islamic radicalization in such a formulaic and repetitive nature.
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Charles Tarpey