Thèses sur le sujet « Regular and singular curve »
Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres
Consultez les 27 meilleures thèses pour votre recherche sur le sujet « Regular and singular curve ».
À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.
Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.
Parcourez les thèses sur diverses disciplines et organisez correctement votre bibliographie.
PeÌrez-VelaÌsquez, Judith. « Singular and regular travelling waves in tumour encapsulation ». Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.435991.
Texte intégralOliver, Joseph Michael. « Pairs of geometric foliations of regular and singular surfaces ». Thesis, Durham University, 2010. http://etheses.dur.ac.uk/280/.
Texte intégralNguyen, Van Luong. « On regular and singular points of the minimum time function ». Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3424058.
Texte intégralLa presente tesi è dedicata allo studio della regolarità della funzione tempo minimo Τ per sistemi di controllo sia lineari che non lineari in dimensione finita. Si considerano dapprima problemi non lineari in cui la condizione di controllabilità detta di Petrov è soddisfatta. Come è ben noto, in questo caso Τ è localmente Lipschitziana e quindi è differenziabile quasi ovunque. In generale, Τ non è differenziabile nei punti dai quali escono diverse traiettorie ottimali e inoltre il fatto che Τ è differenziabile in un punto non garantisce che lo sia in un intorno (l'insieme dei punti di differenziabilità non è aperto). Imponendo alcune condizioni di regolarità sulla dinamica, si dimostra che se il sottodifferenziale prossimale di Τ è non vuoto in un punto x, allora Τ è differenziabile in tutto un intorno di x. La tecnica usata consiste nel derivare relazioni di sensitività per il sottodifferenziale prossimale di Τ e nell'escludere la presenza di punti coniugati dove tale sottodifferenziale è non vuoto. In secondo luogo si studia la regolarità di Τ sotto condizioni di controllabilità più generali, tali da non imporre la Lipschitzianità. In questo caso il bersaglio è l'origine e la dinamica è -- principalmente -- lineare a coefficienti costanti. Si identificano alcuni insiemi singolari (cioè dove Τ non è differenziabile), ad esempio l'insieme dove Τ non è Lipschitz e l'insieme dei punti dove l'insieme raggiungibile presenta più di un versore normale, e si dimostrano risultati di rettificabilità, in questo modo mostrando che sono ``molto piccoli''. Come conseguenza si ricavano ulteriori risultati di regolarità per Τ, fra i quali la regolarità SBV e la differenziabilità e l'analiticità in aperti il cui complementare ha dimensione inferiore a quella dello spazio degli stati. La tecnica usata è basata principalmente su un'analisi accurata degli zeri della cosiddetta funzione di switching.
Chang, Ting-Ying. « On Singular Solutions of Weighted Divergence Operators ». Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/16817.
Texte intégralCai, Yulin. « Integral Points on Modular Curves, Singular Moduli and Conductor-Discriminant Inequality ». Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0098.
Texte intégralThis thesis discusses three topics, so it includes three parts. In the first part, we study S-integral points on the modular curve X0(p). Bilushowed that, using Baker’s method, they can be effectively bounded in terms of p, the base field and the set of places S. Sha made this result explicit, but the bound he obtained is double exponential in p. We drastically improve upon the result of Sha, obtaining a simple exponential bound. This is done using a very explicit version of the Chevalley-Weil principle based on the work of Liu and Lorenzini. Our bound is not only sharper than that of Sha, but is also explicit in all parameters. In the second part, we consider singular moduli. For a fixed singular modulus a, we give an effective upper bound of norm of x - a for another singular modulus x with large discriminant. In the third part, we give a relation between Artin conductors of a Weierstrass model Y and the ones of two given Weierstrass models Y1,Y2. With this relation, we know that the conductor-discriminant inequality holds for Y if it holds for Y1 and Y2
Yang, Xiaojing. « Nonlinear Control System Stability Metrics via A Singular Perturbation Approach ». Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1364466371.
Texte intégralKindler, Lars Verfasser], Hélène [Akademischer Betreuer] Esnault, Phung Ho Hai [Akademischer Betreuer] et Alexander [Akademischer Betreuer] [Beilinson. « Regular singular stratified bundles in positive characteristic / Lars Kindler. Gutachter : Phung Ho Hai ; Alexander A. Beilinson. Betreuer : Hélène Esnault ». Duisburg, 2012. http://d-nb.info/1029288453/34.
Texte intégralOuoba, Mahamadi. « Asymptotic expansion of the expected discounted penalty function in a two-scalestochastic volatility risk model ». Thesis, Mälardalens högskola, Akademin för utbildning, kultur och kommunikation, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-26100.
Texte intégralFedina, Jekaterina. « Statistiniai stegoanalizės metodai ». Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2012~D_20140704_172603-70609.
Texte intégralThe main goal of the thesis is to review the methods of steganography and steganalysis and to experiment with them. Steganography helps to embed hidden messages in such way that anyone except the intended recipient is unaware of the existence of the message but with the use of statistical steganalysis methods those hidden messages can be detected. This thesis consists of two steganography (LSB and LSBH) and two steganalysis methods (RS and PoV) description and implementation. All methods were implemented with JAVA code. Thesis is concluded with a comparison of these methods' quality.
Alabdallah, Suleiman. « Development of a nonlinear equations solver with superlinear convergence at regular singularities ». Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2014. http://dx.doi.org/10.18452/17045.
Texte intégralIn this thesis we present a new type of line-search for Newton’s method, based on range space interpolation as suggested by Wedin et al. [LW84]. The resulting stabilized Newton algorithm is theoretically and practically shown to be efficient in the case of nonsingular roots. Moreover it is observed that it maintains a superlinear rate of convergence at simple singularities. Whereas Newton’s method without line-search is known to converge only linearly from almost all points near the singular root. In view of applications to complementarity problems we also consider systems, whose Jacobian is not differentiable but only semismooth. Again, our stabilized and accelerated Newton’s method achieves superlinearity at simple singularities.
Rêgo, Thiago Luiz de Oliveira do. « Sobre o número máximo de retas em superfícies não singular de grau 4 em P3 ». Universidade Federal da Paraíba, 2016. http://tede.biblioteca.ufpb.br:8080/handle/tede/9302.
Texte intégralMade available in DSpace on 2017-08-23T13:08:07Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 1209071 bytes, checksum: 1eddcf2f494891c2466f5052f15d1ced (MD5) Previous issue date: 2016-09-14
Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPq
In 1943 Beniamino Segrebelievedtohaveshownthatthemaximumnumberof lines containedinasmoothquarticsurfacein P3 is 64, ([16]).Butrecently,therewasa majoroverturnonthatthemewhenthemathematiciansRamsandSchuttfoundthat Segre hadmadeamistakeinhisworktoforgetthequartic'sfamily Z , ([14]),which essentiallycorrespondstothosequarticscontainingalinesthatcanbeincidenttomore than 18 lines containedinthesurface.Inthiswork,basedon([14]),weshowthatevery smoothquarticsurface,whichdoesnotbelongtofamily Z containsamaximumof 64 lines. Oneofthemostimportanttoolstoshowthisresult,isthestudyof_brations _l induced byaline l containedonthesurface,andtherelationshipbetweentheEuler characteristicofthebase(P1 in ourcase),the_bersandthesurfaceconcerned.
Em 1943,BeniaminoSegreacreditouterdemonstradoqueonúmeromáximo de retascontidasnumasuperfíciequárticanãosingularem P3 é 64; ([16]). Mas recentemente,houveumareviravoltanessetema,quandoosmatemáticosSªawomir Rams eMatthiasSchüttconstataramqueSegretinhacometidoumerroemseutrabalho ao esquecerasquárticasdafamília Z; ([14]), quecorrespondemessencialmenteas quárticas quepossuemretasquepodemserincidentesamaisde 18 retas contidas na superfície.Nestetrabalho,tendocomobase[14],mostramosquetodaquártica não singular,quenãopertenceafamília Z; contémnomáximo 64 retas. Umadas ferramentasmaisimportantes,paramostraresseresultado,éoestudodas_brações _l induzida porumareta l contidanasuperfície,earelaçãoqueexisteentrea característica deEulerdabase(emnossocaso P1), das_brassingulareseadasuperfície em questão.
Iezzi, Annamaria. « Nombre de points rationnels des courbes singulières sur les corps finis ». Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4027/document.
Texte intégralIn this PhD thesis, we focus on some issues about the maximum number of rational points on a singular curve defined over a finite field. This topic has been extensively discussed in the smooth case since Weil's works. We have split our study into two stages. First, we provide a construction of singular curves of prescribed genera and base field and with many rational points: such a construction, based on some notions and tools from algebraic geometry and commutative algebra, yields a method for constructing, given a smooth curve X, another curve X' with singularities, such that X is the normalization of X', and the added singularities are rational on the base field and with the prescribed singularity degree. Then, using a Euclidian approach, we prove a new bound for the number of closed points of degree two on a smooth curve defined over a finite field.Combining these two a priori independent results, we can study the following question: when is the Aubry-Perret bound (the analogue of the Weil bound in the singular case) reached? This leads naturally to the study of the properties of maximal curves and, when the cardinality of the base field is a square, to the analysis of the spectrum of their genera
Flores, Quiroz Martín. « Descriptive analysis of the acquisition of the base form, third person singular, present participle regular past, irregular past, and past participle in a supervised artificial neural network and an unsupervised artificial neural network ». Tesis, Universidad de Chile, 2013. http://www.repositorio.uchile.cl/handle/2250/115653.
Texte intégralStudying children’s language acquisition in natural settings is not cost and time effective. Therefore, language acquisition may be studied in an artificial setting reducing the costs related to this type of research. By artificial, I do not mean that children will be placed in an artificial setting, first because this would not be ethical and second because the problem of the time needed for this research would still be present. Thus, by artificial I mean that the tools of simulation found in artificial intelligence can be used. Simulators as artificial neural networks (ANNs) possess the capacity to simulate different human cognitive skills, as pattern or speech recognition, and can also be implemented in personal computers with software such as MATLAB, a numerical computing software. ANNs are computer simulation models that try to resemble the neural processes behind several human cognitive skills. There are two main types of ANNs: supervised and unsupervised. The learning processes in the first are guided by the computer programmer, while the learning processes of the latter are random.
Alici, Haydar. « A General Pseudospectral Formulation Of A Class Of Sturm-liouville Systems ». Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612435/index.pdf.
Texte intégraldinger form may be transformed into a more tractable form. This tractable form will be called here a weighted equation of hypergeometric type with a perturbation (WEHTP) since the non-weighted and unperturbed part of it is known as the equation of hypergeometric type (EHT). It is well known that the EHT has polynomial solutions which form a basis for the Hilbert space of square integrable functions. Pseudospectral methods based on this natural expansion basis are constructed to approximate the eigenvalues of WEHTP, and hence the energy eigenvalues of the Schrö
dinger equation. Exemplary computations are performed to support the convergence numerically.
Aagaard, Fransson Erik Johannes, et Tobias Wall-Horgen. « Building and Evaluating a 3D Scanning System for Measurementsand Estimation of Antennas and Propagation Channels ». Thesis, KTH, Elektroteknisk teori och konstruktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104802.
Texte intégralBacha, Inès. « Traitement symbolique des systèmes d'équations différentielles non linéaires au voisinage des singularités ». Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10078.
Texte intégralBadaoui, Noad. « Dynamique et estimation paramétrique pour les gyroscopes laser à milieu amplificateur gazeux ». Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM058/document.
Texte intégralGaz ring laser gyroscopes provide a high performance technical solution for inertial navigation. However, for very low rotational speeds, the mirrors imperfections of the optical cavity induce a locking phenomena between the phases of the two counter-propagating Laser beams. Hence, the measurements of the phase difference can no longer be used when the speed is within an area around zero, called lock-in zone, or,if a procedure of mechanical dithering is implemented, dithering lock-in zone. Nevertheless, this work shows that it is possible using filtering and estimation methods to measure the speed even within the lock-in zones. To achieve this result, we exploit a physical modeling of the dynamics that we simplify, using singular perturbation techniques, to obtain a generalization of Lamb's equations. There are four non-linear differential equations describing the dynamics of the intensities and phases of the two counter-propagating beams. A qualitative study by regular perturbation theory, exponential stability of the equilibrium points and Poincaré maps allows a characterisation of the lock-in zones according to the mirrors imperfections. It is then possible to estimate online, with an asymptotic observer based on recursive least squares, these imperfections by considering the additional measurements of the beam intensities. Accurate knowledge of these imperfections enables us to compensate them in the dynamic of the relative phase, and thus to estimate rotational speeds within the lock-in zones. Detailed numerical simulations illustrate the interest of those observers to increase the accuracy of gas ring laser gyroscopes
Wehbe, Charbel. « Étude asymptotique de modèles en transition de phase ». Thesis, Poitiers, 2014. http://www.theses.fr/2014POIT2311/document.
Texte intégralThis thesis report is devoted to the study of Caginalp type phase-field Models. Here, we consider two parts : the first is a generalization of the Caginalp type phase-field model based on a generalization of the Maxwell-Cattaneo law and the second with the same model in its conservative version. The study in the two parts is made in a bounded domain. In addition, in the first part we distinguish cases of boundary conditions of Dirichlet and Neumann, while in the second part the model is studied only with Dirichlet conditions (with a regular potential and a singular potential). First, the existence, uniqueness, and regularity of solutions are analyzed by means of classical arguments. Then, the existence of bounded absorbing sets is established. Finally, in some cases, the existence of the global attractor and exponential attractors are analyzed
Kratz, Marie. « Some contributions in probability and statistics of extremes ». Habilitation à diriger des recherches, Université Panthéon-Sorbonne - Paris I, 2005. http://tel.archives-ouvertes.fr/tel-00239329.
Texte intégralGiovannardi, Gianmarco. « Variations for submanifolds of fixed degree ». Doctoral thesis, 2020. https://hdl.handle.net/2158/1287865.
Texte intégralLo, Ja-Yaw, et 羅嘉耀. « Singular Surfaces and Regular Domains of Tridiagonal Matrices ». Thesis, 1989. http://ndltd.ncl.edu.tw/handle/57229348429464493498.
Texte intégral國立清華大學
數學研究所
77
This paper is concerned with tridiagonal matrices of the form ┌ ┐ │g(1) 1 │ │ 1 g(2) 1 │ A(g)=│ . . . │. │ 1 g(n-1) 1 │ │ 1 g(n)│ └ ┘ where g=(g(1),g(2),...,g(n)) is a real vector in Rn. We treat such a matrix as a function of its diagonal vector g=(g(1),g(2),...,g(n)) and investigate, by means of a three-term recurrence relation, the properties of a partition of Rn which consists of "regular domains" and "singular surfaces" with respect to A(g). In particular, properties related to geometrical, topological, symmetry and oscillatory properties of a general partition are given, and analytic estimates of the sizes of the regular domains, as well as existence and localization of eigenvalues related to linear and nonlinear difference eigenvalue problems are derived as application.
Zamani, Mohsen. « Modeling multivariable time series using regular and singular autoregressions ». Phd thesis, 2014. http://hdl.handle.net/1885/151565.
Texte intégralCarriazo, A., M. C. Marquez et Hassan Ugail. « Normal Approximations of Regular Curves and Surfaces ». 2015. http://hdl.handle.net/10454/8162.
Texte intégralBezier curves and surfaces are two very useful tools in Geometric Modeling, with many applications. In this paper, we will offer a new method to provide approximations of regular curves and surfaces by Bezier ones, with the corresponding examples.
范志鵬. « The decoupling design and control of regular and singular systems ». Thesis, 1993. http://ndltd.ncl.edu.tw/handle/84169131491912558148.
Texte intégralHsiu, Teng Kuo, et 鄧國修. « The research of the automatic measurement on regular curve by ». Thesis, 1994. http://ndltd.ncl.edu.tw/handle/00084266656797862200.
Texte intégralBlažková, Eva. « Struktura a aproximace reálných rovinných algebraických křivek ». Doctoral thesis, 2018. http://www.nusl.cz/ntk/nusl-389639.
Texte intégralKálnai, Peter. « Kompaktní moduly nad nesingulárními okruhy ». Doctoral thesis, 2020. http://www.nusl.cz/ntk/nusl-434348.
Texte intégral