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Academic literature on the topic 'Structures de Weyl'

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Published: 22 October 2022

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Journal articles on the topic "Structures de Weyl"

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HiricĂ, Iulia Elena, and Liviu Nicolescu. "On Weyl structures." Rendiconti del Circolo Matematico di Palermo 53, no. 3 (October 2004): 390–400. http://dx.doi.org/10.1007/bf02875731.

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Ohkubo, Takaaki, and Kunio Sakamoto. "CR Einstein-Weyl structures." Tsukuba Journal of Mathematics 29, no. 2 (December 2005): 309–61. http://dx.doi.org/10.21099/tkbjm/1496164961.

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Kim, Jong-Su. "R-CRITICAL WEYL STRUCTURES." Journal of the Korean Mathematical Society 39, no. 2 (March 1, 2002): 193–203. http://dx.doi.org/10.4134/jkms.2002.39.2.193.

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Čap, Andreas, and Jan Slovák. "Weyl structures for parabolic geometries." MATHEMATICA SCANDINAVICA 93, no. 1 (September 1, 2003): 53. http://dx.doi.org/10.7146/math.scand.a-14413.

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Motivated by the rich geometry of conformal Riemannian manifolds and by the recent development of geometries modeled on homogeneous spaces $G/P$ with $G$ semisimple and $P$ parabolic, Weyl structures and preferred connections are introduced in this general framework. In particular, we extend the notions of scales, closed and exact Weyl connections, and Rho-tensors, we characterize the classes of such objects, and we use the results to give a new description of the Cartan bundles and connections for all parabolic geometries.
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Matzeu, Paola. "Almost contact Einstein-Weyl structures." manuscripta mathematica 108, no. 3 (July 1, 2002): 275–88. http://dx.doi.org/10.1007/s002290200262.

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KATAGIRI, Minyo. "On Deformations of Einstein-Weyl Structures." Tokyo Journal of Mathematics 21, no. 2 (December 1998): 457–61. http://dx.doi.org/10.3836/tjm/1270041826.

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Gilkey, Peter, and Stana Nikcevic. "4-dimensional (para)-Kähler-Weyl structures." Publications de l'Institut Math?matique (Belgrade) 94, no. 108 (2013): 91–98. http://dx.doi.org/10.2298/pim1308091g.

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We give an elementary proof of the fact that any 4-dimensional para-Hermitian manifold admits a unique para-Kahler-Weyl structure. We then use analytic continuation to pass from the para-complex to the complex setting and thereby show that any 4-dimensional pseudo-Hermitian manifold also admits a unique Kahler-Weyl structure.
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Alexandrov, B., and S. Ivanov. "Weyl structures with positive Ricci tensor." Differential Geometry and its Applications 18, no. 3 (May 2003): 343–50. http://dx.doi.org/10.1016/s0926-2245(03)00010-x.

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Tod, K. P. "Compact 3-Dimensional Einstein-Weyl Structures." Journal of the London Mathematical Society s2-45, no. 2 (April 1992): 341–51. http://dx.doi.org/10.1112/jlms/s2-45.2.341.

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Bonneau, Guy. "Einstein-Weyl structures and Bianchi metrics." Classical and Quantum Gravity 15, no. 8 (August 1, 1998): 2415–25. http://dx.doi.org/10.1088/0264-9381/15/8/019.

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Dissertations / Theses on the topic "Structures de Weyl"

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Beswick, Matthew. "WEYL filtration dimension and submodule structures for B2." Diss., Kansas State University, 2009. http://hdl.handle.net/2097/1303.

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Doctor of Philosophy
Department of Mathematics
Zongzhu Lin
Let G be a connected and simply connected semisimple algebraic group over an algebraically closed field of positive prime characteristic. Let L([lambda]) and [upside-down triangle]([lambda]) be the simple and induced finite dimensional rational G-modules with p-singular dominant highest weight [lambda]. In this thesis, the concept of Weyl filtration dimension of a finite dimensional rational G-module is studied for some highest weight modules with p-singular highest weights inside the p2-alcove when G is of type B[subscript]2. In chapter 4, intertwining morphisms, a diagonal G-module morphism and tilting modules are used to compute the Weyl filtration dimension of L([lambda]) with [lambda] p-singular and inside the p[superscript]2-alcove. It is shown that the Weyl filtration dimension of L([lambda]) coincides with the Weyl filtration dimension of [upside-down triangle]([lambda]) for almost all (all but one of the 6 facet types) p-singular weights inside the p[superscript]2-alcove. In chapter 5 we study some submodule structures of Weyl (and there translations), Vogan, and tilting modules with both p-regular and p-singular highest weights. Most results are for the p[superscript]2 -alcove only although some concepts used are alcove independent.
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Beswick, Matthew. "WEYL filtration dimension and submodule structures for B₂." Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1303.

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Goudjil, Amar. "Data structures, binary search trees : a study of random Weyl trees." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21559.

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This thesis covers the study of a particular class of binary search trees, the Weyl trees formed by consecutive insertion of numbers {theta}, {2theta}, {3theta}, ..., where theta is an irrational number from (0,1), and {x} denotes the fractional part of x. Various properties of the structure of these trees are explored and a relationship with the continued fraction expansion of theta is shown. Among these properties, an approximation of the height Hn of a Weyl tree with n nodes is given when theta is chosen at random and uniformly on (0, 1). The main result of this work is that in probability, Hn ∼ (12/pi2) log n log log n.
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Goudjil, Amar. "Data structures, binary search trees, a study of random Weyl trees." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0026/MQ50778.pdf.

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Gay, Joël. "Representation of Monoids and Lattice Structures in the Combinatorics of Weyl Groups." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS209/document.

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La combinatoire algébrique est le champ de recherche qui utilise des méthodes combinatoires et des algorithmes pour étudier les problèmes algébriques, et applique ensuite des outils algébriques à ces problèmes combinatoires. L’un des thèmes centraux de la combinatoire algébrique est l’étude des permutations car elles peuvent être interprétées de bien des manières (en tant que bijections, matrices de permutations, mais aussi mots sur des entiers, ordre totaux sur des entiers, sommets du permutaèdre…). Cette riche diversité de perspectives conduit alors aux généralisations suivantes du groupe symétrique. Sur le plan géométrique, le groupe symétrique engendré par les transpositions élémentaires est l’exemple canonique des groupes de réflexions finis, également appelés groupes de Coxeter. Sur le plan monoïdal, ces même transpositions élémentaires deviennent les opérateurs du tri par bulles et engendrent le monoïde de 0-Hecke, dont l’algèbre est la spécialisation à q=0 de la q-déformation du groupe symétrique introduite par Iwahori. Cette thèse se consacre à deux autres généralisations des permutations. Dans la première partie de cette thèse, nous nous concentrons sur les matrices de permutations partielles, en d’autres termes les placements de tours ne s’attaquant pas deux à deux sur un échiquier carré. Ces placements de tours engendrent le monoïde de placements de tours, une généralisation du groupe symétrique. Dans cette thèse nous introduisons et étudions le 0-monoïde de placements de tours comme une généralisation du monoïde de 0-Hecke. Son algèbre est la dégénérescence à q=0 de la q-déformation du monoïde de placements de tours introduite par Solomon. On étudie par la suite les propriétés monoïdales fondamentales du 0-monoïde de placements de tours (ordres de Green, propriété de treillis du R-ordre, J-trivialité) ce qui nous permet de décrire sa théorie des représentations (modules simples et projectifs, projectivité sur le monoïde de 0-Hecke, restriction et induction le long d’une fonction d’inclusion).Les monoïdes de placements de tours sont en fait l’instance en type A de la famille des monoïdes de Renner, définis comme les complétés des groupes de Weyl (c’est-à-dire les groupes de Coxeter cristallographiques) pour la topologie de Zariski. Dès lors, dans la seconde partie de la thèse nous étendons nos résultats du type A afin de définir les monoïdes de 0-Renner en type B et D et d’en donner une présentation. Ceci nous conduit également à une présentation des monoïdes de Renner en type B et D, corrigeant ainsi une présentation erronée se trouvant dans la littérature depuis une dizaine d’années. Par la suite, nous étudions comme en type A les propriétés monoïdales de ces nouveaux monoïdes de 0-Renner de type B et D : ils restent J-triviaux, mais leur R-ordre n’est plus un treillis. Cela ne nous empêche pas d’étudier leur théorie des représentations, ainsi que la restriction des modules projectifs sur le monoïde de 0-Hecke qui leur est associé. Enfin, la dernière partie de la thèse traite de différentes généralisations des permutations. Dans une récente séries d’articles, Châtel, Pilaud et Pons revisitent la combinatoire algébrique des permutations (ordre faible, algèbre de Hopf de Malvenuto-Reutenauer) en terme de combinatoire sur les ordres partiels sur les entiers. Cette perspective englobe également la combinatoire des quotients de l’ordre faible tels les arbres binaires, les séquences binaires, et de façon plus générale les récents permutarbres de Pilaud et Pons. Nous généralisons alors l’ordre faibles aux éléments des groupes de Weyl. Ceci nous conduit à décrire un ordre sur les sommets des permutaèdres, associaèdres généralisés et cubes dans le même cadre unifié. Ces résultats se basent sur de subtiles propriétés des sommes de racines dans les groupes de Weyl qui s’avèrent ne pas fonctionner pour les groupes de Coxeter qui ne sont pas cristallographiques
Algebraic combinatorics is the research field that uses combinatorial methods and algorithms to study algebraic computation, and applies algebraic tools to combinatorial problems. One of the central topics of algebraic combinatorics is the study of permutations, interpreted in many different ways (as bijections, permutation matrices, words over integers, total orders on integers, vertices of the permutahedron…). This rich diversity of perspectives leads to the following generalizations of the symmetric group. On the geometric side, the symmetric group generated by simple transpositions is the canonical example of finite reflection groups, also called Coxeter groups. On the monoidal side, the simple transpositions become bubble sort operators that generate the 0-Hecke monoid, whose algebra is the specialization at q=0 of Iwahori’s q-deformation of the symmetric group. This thesis deals with two further generalizations of permutations. In the first part of this thesis, we first focus on partial permutations matrices, that is placements of pairwise non attacking rooks on a n by n chessboard, simply called rooks. Rooks generate the rook monoid, a generalization of the symmetric group. In this thesis we introduce and study the 0-Rook monoid, a generalization of the 0-Hecke monoid. Its algebra is a proper degeneracy at q = 0 of the q-deformed rook monoid of Solomon. We study fundamental monoidal properties of the 0-rook monoid (Green orders, lattice property of the R-order, J-triviality) which allow us to describe its representation theory (simple and projective modules, projectivity on the 0-Hecke monoid, restriction and induction along an inclusion map).Rook monoids are actually type A instances of the family of Renner monoids, which are completions of the Weyl groups (crystallographic Coxeter groups) for Zariski’s topology. In the second part of this thesis we extend our type A results to define and give a presentation of 0-Renner monoids in type B and D. This also leads to a presentation of the Renner monoids of type B and D, correcting a misleading presentation that appeared earlier in the litterature. As in type A we study the monoidal properties of the 0-Renner monoids of type B and D : they are still J-trivial but their R-order are not lattices anymore. We study nonetheless their representation theory and the restriction of projective modules over the corresponding 0-Hecke monoids. The third part of this thesis deals with different generalizations of permutations. In a recent series of papers, Châtel, Pilaud and Pons revisit the algebraic combinatorics of permutations (weak order, Malvenuto-Reutenauer Hopf algebra) in terms of the combinatorics of integer posets. This perspective encompasses as well the combinatorics of quotients of the weak order such as binary trees, binary sequences, and more generally the recent permutrees of Pilaud and Pons. We generalize the weak order on the elements of the Weyl groups. This enables us to describe the order on vertices of the permutahedra, generalized associahedra and cubes in the same unified context. These results are based on subtle properties of sums of roots in Weyl groups, and actually fail for non-crystallographic Coxeter groups
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Borowka, Aleksandra. "Twistor constructions of quaternionic manifolds and asymptotically hyperbolic Einstein-Weyl spaces." Thesis, University of Bath, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616872.

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Let $S$ be a $2n$-dimensional complex manifold equipped with a line bundle with a real-analytic complex connection such that its curvature is of type $(1,1)$, and with a real analytic h-projective structure such that its h-projective curvature is of type $(1,1)$. For $n=1$ we assume that $S$ is equipped with a real-analytic M\"obius structure. Using the structure on $S$, we construct a twistor space of a quaternionic $4n$-manifold $M$. We show that $M$ can be identified locally with a neighbourhood of the zero section of the twisted (by a unitary line bundle) tangent bundle of $S$ and that $M$ admits a quaternionic $S^1$ action given by unit scalar multiplication in the fibres. We show that $S$ is a totally complex submanifold of $M$ and that a choice of a connection $D$ in the h-projective class on $S$ gives extensions of a complex structure from $S$ to $M$. For any such extension, using $D$, we construct a hyperplane distribution on $Z$ which corresponds to the unique quaternionic connection on $M$ preserving the extended complex structure. We show that, in a special case, the construction gives the Feix--Kaledin construction of hypercomplex manifolds, which includes the construction of hyperk\"ahler metrics on cotangent bundles. We also give an example in which the construction gives the quaternion-K\"ahler manifold $\mathbb{HP}^n$ which is not hyperk\"ahler. We show that the same construction and results can be obtained for $n=1$. By convention, in this case, $M$ is a self-dual conformal $4$-manifold and from Jones--Tod correspondence we know that the quotient $B$ of $M$ by an $S^1$ action is an asymptotically hyperbolic Einstein--Weyl manifold. Using a result of LeBrun \cite{Le}, we prove that $B$ is an asymptotically hyperbolic Einstein--Weyl manifold. We also give a natural construction of a minitwistor space $T$ of an asymptotically hyperbolic Einstein--Weyl manifold directly from $S$, such that $T$ is the Jones--Tod quotient of $Z$. As a consequence, we deduce that the Einstein--Weyl manifold constructed using $T$ is equipped with a distinguished Gauduchon gauge.
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Hadfield, Charles. "Structures de Clifford paires et résonances quantiques." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEE010/document.

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Ce manuscrit se compose de deux parties indépendantes. La première partie de cette thèse étudie les structures de Clifford paires. Pour une variété riemannienne munie d’une structure de Clifford paire, nous introduisons l’espace de twisteurs en généralisant la construction d’un tel espace dans le cas d’une variété quaternion-hermitienne. Nous construisons une structure presque-complexe sur l’espace de twisteurs et considérons son intégrabilité lorsque la structure de Clifford est parallèle. Dans certains cas, nous pouvons aussi le fournir d’une métriquekählerienne ou, correspondant à une structure presque-complexe alternative, d’une métrique “nearly Kähler”. Dans un second temps, nous introduisons une structure appelée Clifford-Weyl sur une variété conforme. Il s’agit d’une structure de Clifford paireq ui est parallèle par rapport au produit tensoriel d’une connexion métrique sur le fibré de Clifford et une connexion de Weyl. Nous démontrons que la connexion de Weyl est fermée sauf dans certains cas génériques de basse dimension où nous arrivons à décrire des exemples explicites où les structures de Clifford-Weyl sont non-fermées. La seconde partie de cette thèse étudie des résonances quantiques. Au-dessus d’une variété asymptotiquement hyperbolique paire, nous considérons le laplacien de Lichnerowicz agissant sur les sections du fibré des formes multilinéaires symétriques.Lorsqu’il s’agit de formes bilinéaires symétriques, nous obtenonsune extension méromorphe de la résolvante dudit laplacien à l’ensemble du plan complexe si la variété est Einstein. Cela définit les résonances quantiques pour ce laplacien. Pour les formes multilinéaires symétriques en général, une telle extension méromorphe est possible si la variété est convexe-cocompacte. Dans les deux cas, nous devons restreindre le laplacien aux sections qui sont de trace et de divergence nulles. Nous utilisons ce deuxième résultat afin d’établir une correspondance classique-quantique pour les variétés hyperboliques convexescocompactes.La correspondance identifie le spectre du flot géodésique (les résonances de Ruelle) avec les spectres des laplaciens agissant sur les tenseurs symétriques qui sont de trace et de divergence nulles (les résonances quantiques)
We study independently even Clfford structures on Riemannian manifolds and quantum resonances on asymptotically hyperbolic manifolds. In the first part of this thesis, we study even Clifford structures.First, we introduce the twistor space of a Riemannian manifold with an even Clifford structure. This notion generalises the twistor space of quaternion-Hermitian manifolds. We construct almost complex structures on the twistor space and check their integrability when the even Clifford structure is parallel. In some cases we give Kähler and nearly-Kähler metrics to these spaces. Second, we introduce the concept of a Clifford-Weyl structure on a conformal manifold. This consists of an even Clifford structure parallel with respect to the tensor product of a metric connection on the Clifford bundle and a Weyl structure on the manifold. We show that the Weyl structure is necessarily closed except for some “generic” low-dimensional instances,where explicit examples of non-closed Clifford-Weyl structures are constructed. In the second part of this thesis, we study quantum resonances. First, we consider the Lichnerowicz Laplacian acting on symmetric 2-tensors on manifolds with an even Riemannian conformally compact Einstein metric. The resolvent of the Laplacian,upon restriction to trace-free, divergence-free tensors, is shown to have a meromorphic continuation to the complex plane. This defines quantum resonances for this Laplacian. For higher rank symmetric tensors, a similar result is proved for convex cocompact quotients of hyperbolic space. Second, we apply this result to establish a direct classical-quantum correspondence on convex cocompact hyperbolic manifolds. The correspondence identifies the spectrum of the geodesic flow with the spectrum of the Laplacian acting on trace-free, divergence-free symmetric tensors. This extends the correspondence previously obtained for cocompact quotients
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Guggenheim, Charles Moses [Verfasser], Martin [Gutachter] Zirnbauer, and Alexander [Gutachter] Altland. "Weyl semimetals: Euler structures and disorder / Charles Moses Guggenheim ; Gutachter: Martin Zirnbauer, Alexander Altland." Köln : Universitäts- und Stadtbibliothek Köln, 2020. http://d-nb.info/1219652415/34.

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Flamencourt, Brice. "On some problems in spectral analysis, spin geometry and conformal geometry." Thesis, université Paris-Saclay, 2022. http://www.theses.fr/2022UPASM014.

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Cette thèse se divise en deux grandes parties. Dans la première, on s'intéresse à deux problèmes d'analyse spectrale portant sur la convergence des valeurs propres d'opérateurs à paramètres. D'une part, on considère l'opérateur de Schrödinger dans le plan, avec un potentiel singulier supporté par une courbe fermée Γ admettant un point de rebroussement. Ce potentiel s'écrit formellement −αδ(x−Γ), et l'on décrit le comportement du spectre de l'opérateur dans la limite α→∞. D'autre part, on étudie l'opérateur de Dirac qui apparaît dans le modèle MIT Bag, en le généralisant aux variétés spin. Lorsque le paramètre de masse de cet opérateur tend vers l'infini, on observe une convergence des valeurs propres. Dans la seconde partie, on discute différents problèmes de géométrie. On démontre tout d'abord des résultats de structure et de classification en dimension 3 pour une classe particulière de spineurs, appelés spineurs de Cauchy, qui apparaissent naturellement comme restrictions de spineurs parallèles à des hypersurfaces orientées de variétés spin. Enfin, on s'intéresse aux connexions de Weyl sur les variétés conformes. On définit les structures localement conformément produits (LCP) par la donnée d'une structure de Weyl fermée, non-exacte, non-plate et à holonomie réductible sur une variété conforme compacte. On analyse les variétés LCP afin d'initier une classification
This thesis is divided into two main parts. In the first one, we focus on two problems of spectral analysis concerning the convergence of eigenvalues of operators with parameters. On the one hand, we consider the Schrödinger operator in the plane, with a singular potential supported by a closed curve Γ admitting a cusp. This potential is formally written −αδ(x−Γ), and we describe the behaviour of the spectrum of the operator as α→∞. On the other hand, we study the Dirac operator which appears in the MIT Bag model, by generalizing it from Euclidean spaces to spin manifolds. We observe a convergence of the eigenvalues of this operator when the mass parameter tends to infinity. In the second part, we discuss two different geometric problems. First, we prove structure and classification results in dimension 3 for a particular class of spinors, called Cauchy spinors, arising as restrictions of parallel spinors to oriented hypersurfaces of spin manifolds. Finally, we focus on Weyl connections on conformal manifolds. We define a locally conformally product (LCP) structure as a closed, non-exact, non-flat Weyl structure with reducible holonomy on a compact conformal manifold. We analyse the LCP manifolds in order to initiate a classification
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Mahajumi, Abu Syed. "InAs/GaSb quantum well structures of Infrared Detector applications. : Quantum well structure." Thesis, IDE, Microelectronics and Photonics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-3848.

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The detection of MWIR (mid wavelength infrared radiation) is the important for industrial, biomedical and military applications.desirable for the radiation detector to operate in the middle wavelength IR (MWIR) band corresponding to a wavelength band ranging from about 3 microns to about 5 microns.Such MWIR detectors allow forobjects having a similar thermal signature. In addition, MWIR detectors may be used in low power applications such as in night vision for surveillance of personnel.

Now a day commercially available uncooled IR sensors operating in MWIR region (2 – 5 μm) use microbolometric detectors which are inherently slow. The novel detector of InAs/GaSb quantum well structures overcomes this limitation. However, third-generation high-performance IR  FPAs are already an attractive proposition to the IR system designer. They covered such as multicolour (at least two, and maybe more different spectral bands) with the possibility of simultaneous detection in both space and time, and ever larger sizes of, say, 2000 × 2000, and operating at higher temperatures, even to room temperature, for all cut-off wavelengths.These hetero structures have a type-II band alignment such that the conduction band of InAs layer is lower than the valence band of GaSb layer. The effective bandgap of thesestructures can be adjusted from 0.4 eV to values below 0.1 eV by varying the thickness of constituent layers leading to an enormous range of detector cutoff wavelengths (3-20 This work is focused on the various key characteristics the optical (responsivity and detectivity) and electrical (surface leakage & dark current) of infrared detector and proof of concept is demonstrated on infrared P-I-N photodiodes based on InAs/GaSb superlattices with ~8.5 μm cutoff wavelength and bandgap energy ~150 meV operating at 78 K where supression of surface leakage currents is observed. In certain military applications, it isthermal imaging of airplanes, artillery tanks and otherμm).


Nice research work at Halmstad University
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Books on the topic "Structures de Weyl"

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Seminar on Hidden Symmetry of Physical Structures, Recipe of Weyl (2nd 1996 Rzeszów, Poland). Proceedings of the Second Seminar on Hidden Symmetry of Physical Structures, Recipe of Weyl, Rzeszów, November 1996. Edited by Wal A and Kuźma M. Rzeszów: Wydawn. Wyższej Szkoły Pedagogicznej, 1997.

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Well-structured mathematical logic. Durham, North Carolina: Carolina Academic Press, 2013.

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Molin, Bernard. Hydrodynamique des structures offshore. Paris: Editions Technip, 2002.

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Shi, Wei. Quantum well structures for infrared photodetection. Hauppauge, N.Y: Nova Science Publishers, 2009.

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Shi, Wei. Quantum well structures for infrared photodetection. Hauppauge, N.Y: Nova Science Publishers, 2009.

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Bakhoum, Mourad M., and Juan A. Sobrino, eds. Case Studies of Rehabilitation, Repair, Retrofitting, and Strengthening of Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2010. http://dx.doi.org/10.2749/sed012.

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<p>This document provides case studies of structural rehabilita-tion, repair, retrofitting, strengthening, and upgrading of structures, which might be encompassed – in short – by the convenient umbrella terms “Conservation / Upgrading of Existing Structures”. The selected studies presented in this SED cover a variety of structural types from different countries.</p> <p>Strengthening and rehabilitation of structures is usually a challenge because of uncertainties associated with old struc-tures and difficulties due to restrictions on the geometry and materials used, as well as other structural or functional con-straints. When repairing an existing structure the engineers involved have plenty of possibilities, lots of constraints, and in some cases there are no applicable codes. Strengthening and rehabilitating is sometimes a complex and exciting work; an art.</p> <p>The book is a summary of practices to help structural engineers. The reader of this book will discover different approaches to put forward strengthening or rehabilitation projects. Even identical technical problems could have very different efficient solutions, as discussed in the papers, considering structural, environmental, economic factors, as well as contractor and designer experience, materials, etc.</p>
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Choudhry, M. A. Optical studies of double well structure. Manchester: UMIST, 1994.

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Tuhfatullin, Boris. Nonlinear problems of structural mechanics. Methods of optimal design of structures. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/1201340.

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The textbook discusses methods of optimal design of structures, including methods for minimizing the functions of one and several variables; methods for solving linear and nonlinear programming problems; examples of optimal design of flat steel frames with elements made of rolled and composite I-beams. It is intended for students studying in the specialty 08.05.01 "Construction of unique buildings and structures", undergraduates studying in the training program 08.04.01.24 "Modern technologies of design and construction of buildings and structures", studying the discipline "Nonlinear problems of structural mechanics", as well as for postgraduates of the direction 08.06.01 " Engineering and construction technologies. Construction of buildings and structures", studying the discipline "Construction Mechanics".
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Pelke, Eberhard, and Eugen Brühwiler, eds. Engineering History and Heritage Structures – Viewpoints and Approaches. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2017. http://dx.doi.org/10.2749/sed015.

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The present Structural Engineering Document (SED) is a compilation of contributions devoted to the vast topic of history of structural engineering as well as interventions on heritage structures and structures of high cultural values. Various, some-times opposed, viewpoints and approaches are expressed and presented. The rather heterogeneous and controversial nature of the content of this SED shall stimulate lively discus-sions within the structural engineering community who needs to increase the awareness of historical and cultural aspects of structures and structural engineering. Current structural engineering methods and practice are only at the very begin-ning of effective engineering, really integrating historical and cultural aspects in the assessment of existing structures and in intervention projects to adapt or modify structures of cultural values for future demands. Knowing the past is indispensable for modern structural engineering!
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Anderson, John E., Christian Bucher, Bruno Briseghella, Xin Ruan, and Tobia Zordan, eds. Sustainable Structural Engineering. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2015. http://dx.doi.org/10.2749/sed014.

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<p>Sustainability is the defining challenge for engineers in the twenty-first century. In addition to safe, economic, and effi-cient structures, a new criterion, sustainable, must be met. Furthermore, this new design paradigm–addressing social, economic, and environmental aspects–requires prompt action. In particular, mitigation of climate change requires sustainable solutions for new as well as existing structures. Taking from both practice and research, this book provides engineers with applicable, timely, and innovative information on the state-of-the-art in sustainable structural design. <p>This Structural Engineering Document addresses safety and regulations, integration concepts, and a sustainable approach to structural design. Life-cycle assessment is presented as a critical tool to quantify design options, and the importance of existing structures–in particular cultural heritage structures–is critically reviewed. Consideration is also given to bridge design and maintenance, structural reassessment, and disaster risk reduction. Finally, the importance of environmentally friendly concrete is examined. Consequently, structural engineers are shown to have the technical proficiency, as well as ethical imperative, to lead in designing a sustainable future.
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Book chapters on the topic "Structures de Weyl"

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Gilkey, P., and S. Nikčević. "(para)-Kähler Weyl Structures." In Recent Trends in Lorentzian Geometry, 335–53. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4897-6_15.

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Borchers, Hans-Jürgen, and Rathindra Nath Sen. "Geometrical Structures on Space-Time." In Mathematical Implications of Einstein-Weyl Causality, 7–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-37681-x_2.

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Borchers, Hans-Jürgen, and Rathindra Nath Sen. "Erratum to: Geometrical Structures on Space-Time." In Mathematical Implications of Einstein-Weyl Causality, 191. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-37681-x_a.

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Malinowski, Stanisław, Jakub Rembieliński, Wacław Tybor, and Loucas C. Papaloucas. "Operator Realisations of Quantum Heisenberg-Weyl and SU(2) q algebras." In Deformations of Mathematical Structures II, 155–60. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1896-5_6.

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Moonen, Ben. "Group Schemes with Additional Structures and Weyl Group Cosets." In Moduli of Abelian Varieties, 255–98. Basel: Birkhäuser Basel, 2001. http://dx.doi.org/10.1007/978-3-0348-8303-0_10.

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Broué, Michel, and Jean Michel. "Sur certains éléments réguliers des groupes de Weyl et les variétés de Deligne—Lusztig associées." In Finite Reductive Groups: Related Structures and Representations, 73–139. Boston, MA: Birkhäuser Boston, 1997. http://dx.doi.org/10.1007/978-1-4612-4124-9_4.

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Fox, Daniel J. F. "Geometric Structures Modeled on Affine Hypersurfaces and Generalizations of the Einstein–Weyl and Affine Sphere Equations." In Trends in Mathematics, 15–19. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-21284-5_3.

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Finkel, Alain, and Philippe Schnoebelen. "Fundamental structures in Well-Structured infinite Transition Systems." In LATIN'98: Theoretical Informatics, 102–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/bfb0054314.

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Koshiba, Masanori. "Quantum Well Structures." In Optical Waveguide Theory by the Finite Element Method, 247–65. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1634-3_10.

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Yamada, Minoru. "Quantum Well Structure." In Springer Series in Optical Sciences, 199–217. Tokyo: Springer Japan, 2014. http://dx.doi.org/10.1007/978-4-431-54889-8_11.

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Conference papers on the topic "Structures de Weyl"

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De Baerdemacker, S., K. Heyde, V. Hellemans, Matko Milin, Tamara Niksic, Suzana Szilner, and Dario Vretenar. "Collective Structures Within the Cartan-Weyl Based Geometrical Model." In NUCLEAR STRUCTURE AND DYNAMICS ’09: Proceedings of the International Conference. AIP, 2009. http://dx.doi.org/10.1063/1.3232082.

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GRIBACHEVA, DOBRINKA KOSTADINOVA. "ORTHOGONAL COMPOSITIONS IN A FOUR-DIMENSIONAL WEYL SPACE." In Proceedings of the 7th International Workshop on Complex Structures and Vector Fields. WORLD SCIENTIFIC, 2005. http://dx.doi.org/10.1142/9789812701763_0009.

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RAPOPORT, DIEGO L. "RIEMANN-CARTAN-WEYL GEOMETRIES, QUANTUM MOTIONS AND RANDOM SYMPLECTIC STRUCTURES." In Proceedings of the MG10 Meeting held at Brazilian Center for Research in Physics (CBPF). World Scientific Publishing Company, 2006. http://dx.doi.org/10.1142/9789812704030_0123.

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Devyatov, Eduard. "JOSEPHSON CURRENT TRANSFER BY WEYL TOPOLOGICAL SEMIMETALS SURFACE STATES." In International Forum “Microelectronics – 2020”. Joung Scientists Scholarship “Microelectronics – 2020”. XIII International conference «Silicon – 2020». XII young scientists scholarship for silicon nanostructures and devices physics, material science, process and analysis. LLC MAKS Press, 2020. http://dx.doi.org/10.29003/m1583.silicon-2020/145-149.

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Experiments on the study of topological surface states of magnetic and nonmagnetic Weyl semimetals charge transfer are presented. For surface states contribution the stationary and nonstationary Josephson effect realized at superconductortopological semi-metal-superconductor hybrid structures is applied.
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ÖZDEĞER, ABDÜLKADIR. "A FUNCTION OF DIRECTION IN A WEYL SUBSPACE ASSOCIATED WITH A SET OF ORTHOGONAL VECTOR FIELDS." In Proceedings of the 6th International Workshop on Complex Structures and Vector Fields. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812704191_0017.

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Messac, Achille, and Glynn Sundararaj. "Physical programming's ability to generate a well-distributed set of Pareto points." In 41st Structures, Structural Dynamics, and Materials Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-1666.

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Zarepoor, Masoud, and Onur Bilgen. "Constrained-Energy Cross-Well Actuation of the Duffing-Holmes Oscillator." In 57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-0201.

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Gupta, Sushmita, Pallavi Jain, and Saket Saurabh. "Well-Structured Committees." In Twenty-Ninth International Joint Conference on Artificial Intelligence and Seventeenth Pacific Rim International Conference on Artificial Intelligence {IJCAI-PRICAI-20}. California: International Joint Conferences on Artificial Intelligence Organization, 2020. http://dx.doi.org/10.24963/ijcai.2020/27.

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In the standard model of committee selection, we are given a set of ordinal votes over a set of candidates and a desired committee size, and the task is to select a committee that relates to the given votes. Motivated by possible interactions and dependencies between candidates, we study a generalization of committee selection in which the candidates are connected via a network and the task is to select a committee that relates to the given votes while also satisfy certain properties with respect to this candidate network. To accommodate certain correspondences to the voter preferences, we consider three standard voting rules (in particular, $k$-Borda, Chamberlin-Courant, and Gehrlein stability); to model different aspects of interactions and dependencies between candidates, we consider two graph properties (in particular, Independent Set and Connectivity). We study the parameterized complexity of the corresponding combinatorial problems and discuss certain implications of our algorithmic results.
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Hooyoung Song, Jin Soak Kim, Eun Kyu Kim, Sung-Ho Lee, Jae Bum Kim, Ji-Su Son, and Sung-Min Hwang. "Structural, electrical, and optical characterizations of a-plane InGaN/GaN quantum well structures." In 2009 International Semiconductor Device Research Symposium (ISDRS 2009). IEEE, 2009. http://dx.doi.org/10.1109/isdrs.2009.5378317.

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Mizuno, T., Y. Suzuki, M. Yamanaka, Y. Nagamine, Y. Nakahara, Y. Nagata, T. Aoki, and T. Maeda. "Impact of Surface Oxide Layer on Band Structure Modulation in Si Quantum Well Structures." In 2014 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2014. http://dx.doi.org/10.7567/ssdm.2014.ps-3-2.

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Reports on the topic "Structures de Weyl"

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Ebeling, Robert, and Barry White. Load and resistance factors for earth retaining, reinforced concrete hydraulic structures based on a reliability index (β) derived from the Probability of Unsatisfactory Performance (PUP) : phase 2 study. Engineer Research and Development Center (U.S.), March 2021. http://dx.doi.org/10.21079/11681/39881.

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This technical report documents the second of a two-phase research and development (R&D) study in support of the development of a combined Load and Resistance Factor Design (LRFD) methodology that accommodates geotechnical as well as structural design limit states for design of the U.S. Army Corps of Engineers (USACE) reinforced concrete, hydraulic navigation structures. To this end, this R&D effort extends reliability procedures that have been developed for other non-USACE structural systems to encompass USACE hydraulic structures. Many of these reinforced concrete, hydraulic structures are founded on and/or retain earth or are buttressed by an earthen feature. Consequently, the design of many of these hydraulic structures involves significant soil structure interaction. Development of the required reliability and corresponding LRFD procedures has been lagging in the geotechnical topic area as compared to those for structural limit state considerations and have therefore been the focus of this second-phase R&D effort. Design of an example T-Wall hydraulic structure involves consideration of five geotechnical and structural limit states. New numerical procedures have been developed for precise multiple limit state reliability calculations and for complete LRFD analysis of this example T-Wall reinforced concrete, hydraulic structure.
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Bell, Gary, and Duncan Bryant. Red River Structure physical model study : bulkhead testing. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/40970.

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The US Army Corps of Engineers, St. Paul District, and its non-federal sponsors are designing and constructing a flood risk management project that will reduce the risk of flooding in the Fargo-Moorhead metropolitan area. There is a 30-mile long diversion channel around the west side of the city of Fargo, as well as a staging area that will be formed upstream of a 20-mile long dam (referred to as the Southern Embankment) that collectively includes an earthen embankment with three gated structures: the Diversion Inlet Structure, the Wild Rice River Structure, and the Red River Structure (RRS). A physical model has been constructed and analyzed to assess the hydraulic conditions near and at the RRS for verification of the structure’s flow capacity as well as optimization of design features for the structure. This report describes the modeling techniques and instrumentation used in the investigation and details the evaluation of the forces exerted on the proposed bulkheads during emergency operations for the RRS.
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Shapiro, Noad Asaf. Radiative transitions in InGaN quantum-well structures. Office of Scientific and Technical Information (OSTI), January 2002. http://dx.doi.org/10.2172/799651.

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Wozniakowska, P., D. W. Eaton, C. Deblonde, A. Mort, and O. H. Ardakani. Identification of regional structural corridors in the Montney play using trend surface analysis combined with geophysical imaging, British Columbia and Alberta. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328850.

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The Western Canada Sedimentary Basin (WCSB) is a mature oil and gas basin with an extraordinary endowment of publicly accessible data. It contains structural elements of varying age, expressed as folding, faulting, and fracturing, which provide a record of tectonic activity during basin evolution. Knowledge of the structural architecture of the basin is crucial to understand its tectonic evolution; it also provides essential input for a range of geoscientific studies, including hydrogeology, geomechanics, and seismic risk analysis. This study focuses on an area defined by the subsurface extent of the Triassic Montney Formation, a region of the WCSB straddling the border between Alberta and British Columbia, and covering an area of approximately 130,000 km2. In terms of regional structural elements, this area is roughly bisected by the east-west trending Dawson Creek Graben Complex (DCGC), which initially formed in the Late Carboniferous, and is bordered to the southwest by the Late Cretaceous - Paleocene Rocky Mountain thrust and fold belt (TFB). The structural geology of this region has been extensively studied, but structural elements compiled from previous studies exhibit inconsistencies arising from distinct subregions of investigation in previous studies, differences in the interpreted locations of faults, and inconsistent terminology. Moreover, in cases where faults are mapped based on unpublished proprietary data, many existing interpretations suffer from a lack of reproducibility. In this study, publicly accessible data - formation tops derived from well logs, LITHOPROBE seismic profiles and regional potential-field grids, are used to delineate regional structural elements. Where seismic profiles cross key structural features, these features are generally expressed as multi-stranded or en echelon faults and structurally-linked folds, rather than discrete faults. Furthermore, even in areas of relatively tight well control, individual fault structures cannot be discerned in a robust manner, because the spatial sampling is insufficient to resolve fault strands. We have therefore adopted a structural-corridor approach, where structural corridors are defined as laterally continuous trends, identified using geological trend surface analysis supported by geophysical data, that contain co-genetic faults and folds. Such structural trends have been documented in laboratory models of basement-involved faults and some types of structural corridors have been described as flower structures. The distinction between discrete faults and structural corridors is particularly important for induced seismicity risk analysis, as the hazard posed by a single large structure differs from the hazard presented by a corridor of smaller pre-existing faults. We have implemented a workflow that uses trend surface analysis based on formation tops, with extensive quality control, combined with validation using available geophysical data. Seven formations are considered, from the Late Cretaceous Basal Fish Scale Zone (BFSZ) to the Wabamun Group. This approach helped to resolve the problem of limited spatial extent of available seismic data and provided a broader spatial coverage, enabling the investigation of structural trends throughout the entirety of the Montney play. In total, we identified 34 major structural corridors and number of smaller-scale structures, for which a GIS shapefile is included as a digital supplement to facilitate use of these features in other studies. Our study also outlines two buried regional foreland lobes of the Rocky Mountain TFB, both north and south of the DCGC.
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Henderson, B. Laser Spectroscopy of Quantum Well and Superlattice Structures. Fort Belvoir, VA: Defense Technical Information Center, February 1988. http://dx.doi.org/10.21236/ada193336.

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Nolte, David D., and M. R. Melloch. Fabry-Perot Photorefractive Quantum Well Structures for Adaptive Processing. Fort Belvoir, VA: Defense Technical Information Center, November 1995. http://dx.doi.org/10.21236/ada304136.

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Li, D., and S. D. Bader. Magnetic quantum well states in ultrathin film and wedge structures. Office of Scientific and Technical Information (OSTI), April 1996. http://dx.doi.org/10.2172/226044.

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Beck, William A., Mark S. Mirotznik, and Thomas S. Faska. Antenna Structures for Optical Coupling in Quantum-Well Infrared Detectors. Fort Belvoir, VA: Defense Technical Information Center, March 1998. http://dx.doi.org/10.21236/ada342154.

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Patel, Reena. Complex network analysis for early detection of failure mechanisms in resilient bio-structures. Engineer Research and Development Center (U.S.), June 2021. http://dx.doi.org/10.21079/11681/41042.

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Bio-structures owe their remarkable mechanical properties to their hierarchical geometrical arrangement as well as heterogeneous material properties. This dissertation presents an integrated, interdisciplinary approach that employs computational mechanics combined with flow network analysis to gain fundamental insights into the failure mechanisms of high performance, light-weight, structured composites by examining the stress flow patterns formed in the nascent stages of loading for the rostrum of the paddlefish. The data required for the flow network analysis was generated from the finite element analysis of the rostrum. The flow network was weighted based on the parameter of interest, which is stress in the current study. The changing kinematics of the structural system was provided as input to the algorithm that computes the minimum-cut of the flow network. The proposed approach was verified using two classical problems three- and four-point bending of a simply-supported concrete beam. The current study also addresses the methodology used to prepare data in an appropriate format for a seamless transition from finite element binary database files to the abstract mathematical domain needed for the network flow analysis. A robust, platform-independent procedure was developed that efficiently handles the large datasets produced by the finite element simulations. Results from computational mechanics using Abaqus and complex network analysis are presented.
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Bavli, R., and H. Metiu. Laser Induced Localization of an Electron in a Double-Well Quantum Structure. Fort Belvoir, VA: Defense Technical Information Center, May 1992. http://dx.doi.org/10.21236/ada252060.

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