Relevant bibliographies by topics / Fibres de Springer

Academic literature on the topic 'Fibres de Springer'

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Published: 8 June 2024

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Journal articles on the topic "Fibres de Springer":

1

Kottwitz, Robert, and Eva Viehmann. "Generalized affine Springer fibres." Journal of the Institute of Mathematics of Jussieu 11, no. 3 (January 3, 2012): 569–609. http://dx.doi.org/10.1017/s147474801100020x.

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AbstractThis paper studies two new kinds of affine Springer fibres that are adapted to the root valuation strata of Goresky–Kottwitz–MacPherson. In addition it develops various linear versions of Katz's Hodge–Newton decomposition.
2

SCHÄFER, GISA. "A GRAPHICAL CALCULUS FOR 2-BLOCK SPALTENSTEIN VARIETIES." Glasgow Mathematical Journal 54, no. 2 (March 29, 2012): 449–77. http://dx.doi.org/10.1017/s0017089512000110.

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AbstractWe generalise statements known about Springer fibres associated to nilpotents with two Jordan blocks to Spaltenstein varieties. We study the geometry of generalised irreducible components (i.e. Bialynicki-Birula cells) and their pairwise intersections. In particular, we develop a graphical calculus that encodes their structure as iterated fibre bundles with ℂℙ1 as base spaces, and compute their cohomology. At the end, we present a connection with coloured cobordisms generalising the construction of Khovanov (M. Khovanov, A categorification of the Jones polynomial, Duke Math. J. 101(3) (2000), 359–426) and Stroppel (C. Stroppel, Parabolic category O, perverse sheaves on Grassmannians, Springer fibres and Khovanov homology, Compositio Mathematica145(4) (2009), 954–992).
3

Nandakumar, V., D. Rosso, and N. Saunders. "Irreducible components of exotic Springer fibres." Journal of the London Mathematical Society 98, no. 3 (July 16, 2018): 609–37. http://dx.doi.org/10.1112/jlms.12152.

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4

Chen, Zongbin. "Pureté des fibres de Springer affines pour $GL_4$." Bulletin de la Société mathématique de France 142, no. 2 (2014): 193–222. http://dx.doi.org/10.24033/bsmf.2663.

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5

Chaudouard, Pierre-Henri, and Gérard Laumon. "Sur l'homologie des fibres de Springer affines tronquées." Duke Mathematical Journal 145, no. 3 (December 2008): 443–535. http://dx.doi.org/10.1215/00127094-2008-057.

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6

BOUTHIER, ALEXIS. "DIMENSION DES FIBRES DE SPRINGER AFFINES POUR LES GROUPES." Transformation Groups 20, no. 3 (July 30, 2015): 615–63. http://dx.doi.org/10.1007/s00031-015-9326-9.

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7

Fresse, Lucas. "Nombres de Betti des fibres de Springer de type A." Comptes Rendus Mathematique 347, no. 5-6 (March 2009): 283–87. http://dx.doi.org/10.1016/j.crma.2009.01.014.

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8

Jóźwicki, Mateusz Łukasz, Mateusz Gargol, Małgorzata Gil-Kowalczyk, and Paweł Mergo. "Commercially available granulates PMMA and PS - potential problems with the production of polymer optical fibers." Photonics Letters of Poland 12, no. 3 (September 30, 2020): 79. http://dx.doi.org/10.4302/plp.v12i3.1036.

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The aim of the study was to verify the usefulness of commercially available granulates of PMMA (poly (methyl methacrylate) and PS (polystyrene) for the production of polymer optical fibers by extrusion method. Samples were subjected to thermal processing in various conditions (different temperatures and exposure time). Thermal (TG/DTG) and spectroscopic (ATR/FT-IR) analyses were carried out to analyze changes in the samples. Based on FT-IR analysis of liquid monomers and granulates the conversion of double bonds was calculated, which gave us a picture of the degree of monomers conversion, crucial information from the technological point of view. Full Text: PDF ReferencesO. Ziemann, J. Krauser, P.E. Zamzow, W. Daum, POF Polymer Optical Fibersfor Data Communication (Berlin: Springer 2008). DirectLink P. Stajanca et al. "Solution-mediated cladding doping of commercial polymer optical fibers", Opt. Fiber Technol. 41, 227-234, (2018). CrossRef K. Peters, "Polymer optical fiber sensors—a review", Smart Mater. Struct., 20 013002 (2011) CrossRef J. Zubia and J. Arrue, "Plastic Optical Fibers: An Introduction to Their Technological Processes and Applications", Opt. Fiber Technol. 7 ,101-40 (2001) CrossRef M. Beckers, T. Schlüter, T. Gries, G. Seide, C.-A. Bunge, "6 - Fabrication techniques for polymer optical fibres", Polymer Optical Fibres, 187-199 (2017) CrossRef M. Niedźwiedź , M. Gil, M. Gargol , W. Podkościelny, P. Mergo, "Determination of the optimal extrusion temperature of the PMMA optical fibers", Phot. Lett. Poland 11, 7-9 (2019) CrossRef
9

Ehrig, Michael, and Catharina Stroppel. "2-row Springer Fibres and Khovanov Diagram Algebras for Type D." Canadian Journal of Mathematics 68, no. 6 (December 1, 2016): 1285–333. http://dx.doi.org/10.4153/cjm-2015-051-4.

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AbstractWe study in detail two row Springer fibres of even orthogonal type from an algebraic as well as a topological point of view. We show that the irreducible components and their pairwise intersections are iterated ℙ1-bundles. Using results of Kumar and Procesi we compute the cohomology ring with its action of the Weyl group. The main tool is a type D diagram calculus labelling the irreducible components in a convenient way that relates to a diagrammatical algebra describing the category of perverse sheaves on isotropic Grassmannians based on work of Braden. The diagram calculus generalizes Khovanov's arc algebra to the type D setting and should be seen as setting the framework for generalizing well-known connections of these algebras in type A to other types.
10

BOUTHIER, ALEXIS, and JINGREN CHI. "Correction to: DIMENSION DES FIBRES DE SPRINGER AFFINES POUR LES GROUPES." Transformation Groups 23, no. 4 (October 15, 2018): 1217–22. http://dx.doi.org/10.1007/s00031-018-9496-3.

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You might also be interested in the extended bibliographies on the topic 'Fibres de Springer' for particular source types:
Journal articles Dissertations / Theses

Dissertations / Theses on the topic "Fibres de Springer":

1

Chen, Zongbin. "Pureté des fibres de Springer affines pour GL_4." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112266/document.

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La thèse consiste de deux parties. Dans la première partie, on montre la pureté des fibres de Springer affines pour $\gl_{4}$ dans le cas non-ramifié. Plus précisément, on construit une famille de pavages non standard en espaces affines de la grassmannienne affine, qui induisent des pavages en espaces affines de la fibre de Springer affine. Dans la deuxième partie, on introduit une notion de $\xi$-stabilité sur la grassmannienne affine $\xx$ pour le groupe $\gl_{d}$, et on calcule le polynôme de Poincaré du quotient $\xx^{\xi}/T$ de la partie $\xi$-stable $\xxs$ par le tore maximal $T$ par une processus analogue de la réduction de Harder-Narasimhan
This thesis consists of two parts. In the first part, we prove the purity of affine Springer fibers for $\gl_{4}$ in the unramified case. More precisely, we have constructed a family of non standard affine pavings for the affine grassmannian, which induce an affine paving for the affine Springer fiber. In the second part, we introduce a notion of $\xi$-stability on the affine grassmannian $\xx$ for the group $G=\gl_{d}$, and we calculate the Poincaré polynomial of the quotient $\xx^{\xi}/T$ of the stable part $\xxs$ by the maximal torus $T$ by a process analogue to the Harder-Narasimhan reduction
2

Chen, Zongbin. "Sur la pureté des fibres de Springer affines non-ramifiées pour GL4." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00656163.

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La thèse consiste de deux parties. Dans la première partie, on montre la pureté des fibres de Springer affines pour $\gl_{4}$ dans le cas non-ramifié. Plus précisément, on construit une famille de pavages non standard en espaces affines de la grassmannienne affine, qui induisent des pavages en espaces affines de la fibre de Springer affine. Dans la deuxième partie, on introduit une notion de $\xi$-stabilité sur la grassmannienne affine $\xx$ pour le groupe $\gl_{d}$, et on calcule le polynôme de Poincaré du quotient $\xx^{\xi}/T$ de la partie $\xi$-stable $\xxs$ par le tore maximal $T$ par une processus analogue de la réduction de Harder-Narasimhan.
3

Fresse, Lucas. "Une étude combinatoire de la géométrie des fibres de Springer de type A." Lyon 1, 2007. http://www.theses.fr/2007LYO10322.

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On appelle fibre de Springer la variété des drapeaux stables par un endomorphisme nilpotent. Nous étudions cette variété et ses composantes irréductibles. Les points fixes d’un tore sur cette variété sont paramétrés par un ensemble de tableaux dits lignes-standards. Nous construisons une décomposition en cellules de la variété naturellement paramétrée par les tableaux lignes-standards, au sens où chaque cellule contient un point fixe, et dont la codimension des cellules est analogue une longueur de Bruhat. Cela permet un calcul pratique des nombres de Betti. Lorsque l’endomorphisme nilpotent est de type crochet, deux-lignes ou deux-colonnes, nous définissons une notion de constructibilité pour les tableaux lignes-standards qui permet de décrire les points fixes des composantes. Nous déduisons un calcul de la dimension d’une intersection finie de composantes et, dans le cas deux colonnes, un critère de singularité
The variety of flags which are stable by a nilpotent endomorphism is called Springer fiber. We study this variety and its irreducible components. The fixed points of a torus on this variety are parameterized by a set of tableaux said row-standard. We construct a cell decomposition of the variety which is naturally parameterized by the row-standard tableaux, since each cell contains one fixed point, and such that the codimension of cells is analogous to a Bruhat length. This allows a handy calculation of the Betti numbers. When the nilpotent endomorphism is of hook, two-rows or two-columns type, we define a notion of constructibility for the row-standard tableaux which allows to describe the fixed points of the components. We deduce a calculation of the dimension of a finite intersection of components and, in the two-columns case, a criterion of singularity
4

Jacques, Simon. "Adhérences de certaines orbites dans la variété de drapeaux, résolution et normalité dans les types classiques A, B, D." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0299.

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Soit G un groupe algébrique en type classique A, B ou D. Soit e un élément nilpotent de son algèbre de Lie et Z son centralisateur. On suppose la caractéristique nulle et l'ordre de e, vu comme endomorphisme, égal à deux. Cette thèse établit les propriétés de normalité, rationalité et Cohen-Macaulay pour toute adhérence Y d'une Z-orbite dans la variété des drapeaux de G. Elle étend ainsi un résultat de N.Perrin et E.Smirnov qui traitant le cas où Y est une composante irréductible d'une fibre de Springer pour les types A et D. Nous employons le même argument principal, à savoir un raisonnement récursif basé sur (1) la birationnalité d'un morphisme vers Y et (2) la surjectivité d'une restriction de sections. Pour produire (1), nous faisons intervenir les variétés de Schubert, de Bott-Samelson et employons la théorie des sous-groupes symétriques en recourant à des références classiques sur le sujet (R-W Richardson, T-A Springer). Pour (2), nous nous basons sur un théorème de X.He et J-F Thomsen fournissant un scindage de Frobenius. Celui-ci implique alors (2) en caractéristique positive et nous opérons une réduction p pour nous ramener à la caractéristique nulle de départ. Notre travail appelle à se prolonger dans différentes pistes de réflexion et de recherche. Il pourrait avoir des implications positives pour l'étude des composantes irréductibles de la variété de Steinberg, et à travers elles, du calcul de polynômes caractéristiques introduits par A.Joseph afin de constituer des représentations irréductibles du groupe de Weyl. Notre travail pose aussi la question naturelle de la généralisation de son résultat au type C, aux types exceptionnels et à la caractéristique positive
Let G be a connected algebraic reductive group in types A, B, or D, and e be a nilpotent element of its Lie algebra with centralizer Z:=Z_G(e). We suppose the characteristic zero and that e corresponds to a nilpotent endomorphism of order two. We sketch a proof of the following result: all Z-orbit closures Y in the flag variety X of G are normal. It extends a work of Nicolas Perrin and Evgeny Smirnov which deals with an irreducible component Y of the Springer fiber X(e) in types A and D. We use the same main arguments, namely an induction based on (1): the existence of a suitable birational morphism onto Y, and (2): the surjectivity of section restrictions of an ample line bundle. For us (1) will be obtained thanks to good Weyl group elements, Schubert varieties, Bott-Samelson varieties and several fundamental results from Roger Wolcott Richardson and Tonny Albert Springer on symmetric spaces. On the other hand, (2) follows from a theorem proved by Xuhua He and Jesper Funch Thomsen which states Frobenius splittings of Y-like varieties. It thus implies (2) in positive characteristic and we just have to pass it through the zero : we then merely produce an example of the reduction modulo p method.Our work suggests several avenues of research and could be improved in several directions. It could have implications for the study of the irreducible components of the Steinberg variety and thus for the calculation of the characteristic polynomials. They have been introduced by Anthony Joseph in order to constitute irreducible representations of the Weyl group. Our work also raises the question of its generalization to the C type, the exceptional types and the positive characteristic
5

Bouthier, Alexis. "Géométrisation du côté orbital de la formule des traces." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112064.

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Ce travail de thèse a pour but de construire et d’étudier une fibration de Hitchin pour les groupes qui apparaît naturellement lorsque l’on essaie de géométriser la formule des traces. On commence par construire une telle fibration en utilisant le semi-groupe de Vinberg. Sur ce semi-groupe de Vinberg, on montre qu’il existe un certain morphisme « polynôme caractéristique » muni d’une section naturelle, de même que dans le cas des algèbres de Lie. On montre également que l’on peut construire un centralisateur régulier au-dessus de cette base des polynômes caractéristiques qui est un schéma en groupes commutatif et lisse.On s’intéresse alors à des variantes pour les groupes des fibres de Springer affines pour lesquelles on remarque que l’introduction du semi-groupe de Vinberg permet d’obtenir une condition d’intégralité analogue à celle de Kazhdan-Lusztig. Ces fibres de Springer affines sont des analogues locaux des fibres de Hitchin. On obtient alors une formule de dimension pour ces fibres.Dans un troisième temps, on s’intéresse à l’aspect global de cette fibration pour laquelle on donne une interprétation modulaire et sur laquelle on construit l’action d’un champ de Picard, issu du centralisateur régulier. L’espace total de cette fibration étant en général singulier, nous étudions son complexe d’intersection. Cet espace de Hitchin s’obtient naturellement comme l’intersection du champ de Hecke avec la diagonale du champ des G-torseurs et on démontre que sur un ouvert suffisamment gros de la base de Hitchin, le complexe d’intersection de l’espace de Hitchin s’obtient par restriction de celui du champ de Hecke corrrespondant.Enfin, dans la dernière partie de cette thèse, on établit un théorème du support dans le cas où l’espace total est singulier analogue à celui de Ngô et l’on démontre que, dans le cas de la fibration de Hitchin, les supports qui interviennent sont reliés aux strates endoscopiques
This main goal of this work is to construct and study the properties of Hitchin fibration for groups which appears naturally when we try to geometrize the trace formula. We begin by constructing this fibration using the Vinberg’s semigroup. On this semigroup, we show that there exists a characteristic polynomial morphism equipped with a natural section, analog at the Kostant’s one in the case of Lie algebras. We also show that there exists on the base of characteristic polynomials a regular centralizer scheme, which is a smooth commutative group scheme.Then, we are interested in some variant of affine Springer fibers, for which we see that the Vinberg’s semigroup appears naturally to obtain an integrality condition analog to Kazhdan-Lusztig’s one. These affine Springer fibers are local incarnation of Hitchin fibers.In a third time, we go back to the global case and give a modular interpretation of this new Hitchin fibration on which we construct an action of a Picard stack, coming from the regular centralizer.The total space of this fibration, even on the generically regular semisimple locus will be singular and we want to understand his intersection complex. This space can be obtained as the intersection of the Hecke stack with the diagonal of the stack of G-bundles and we show that on a sufficiently big open subset of the Hitchin base, the intersection complex of the Hitchin’s space is the restriction of the corresponding intersection complex on the Hecke stack.Finally, in the last part of this work, we establish a support theorem in the case of a singular total space, generalizing Ngo’s theorem et we show that in the case of Hitchin fibration, the supports that appear are related to the endoscopic strata
6

Yue, Guangyi. "Combinatorics of affine Springer fibers and combinatorial wall-crossing." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/126939.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mathematics, May, 2020
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 149-152).
This thesis deals with several combinatorial problems in representation theory. The first part of the thesis studies the combinatorics of affine Springer fibers of type A. In particular, we give an explicit description of irreducible components of Fl[subscript tS] and calculate the relative positions between two components. We also study the lowest two-sided Kazhdan-Lusztig cell and establish a connection with the affine Springer fibers, which is compatible with the affine matrix ball construction algorithm. The results also prove a special case of Lusztig's conjecture. The work in this part include joint work with Pablo Boixeda. In the second part, we define the combinatorial wall-crossing transformation and the generalized column regularization on partitions and prove that a certain composition of these two transformations has the same effect on the one-row partition. This result gives a special situation where column regularization, can be used to understand the complicated Mullineux map, and also proves a special case of Bezrukavnikov's conjecture. Furthermore, we prove a condition under which the two maps are exactly the same, generalizing the work of Bessenrodt, Olsson and Xu. The combinatorial constructions is related to the Iwahori-Hecke algebra and the global crystal basis of the basic [ ... ]-module and we provide several conjectures regarding the q-decomposition numbers and generalizations of results due to Fayers. This part is a joint work with Panagiotis Dimakis and Allen Wang.
by Guangyi Yue.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Mathematics
7

Wilbert, Arik [Verfasser]. "Two-row Springer fibers, foams and arc algebras of type D / Arik Wilbert." Bonn : Universitäts- und Landesbibliothek Bonn, 2017. http://d-nb.info/113904897X/34.

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Boixeda, Alvarez Pablo. "Affine Springer fibers and the representation theory of small quantum groups and related algebras." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/126920.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mathematics, May, 2020
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 125-128).
This thesis deals with the connections of Geometry and Representation Theory. In particular we study the representation theory of small quantum groups and Frobenius kernels and the geometry of an equivalued affine Springer fiber Fl[subscript ts] for s a regular semisimple element. In Chapter 2 we relate the center of the small quantum group with the cohomology of the above affine Springer fiber. This includes joint work with Bezrukavnikov, Shan and Vaserot. In Chapter 3 we study the geometry of the affine Springer fiber and in particular understand the fixed points of a torus action contained in each component. In Chapter 4 we further have a collection of algebraic results on the representation theory of Frobenius kernels. In particular we state some results pointing towards some construction of certain partial Verma functors and we compute this in the case of SL₂. We also compute the center of Frobenius kernels in the case of SL₂ and state a conjecture on a possible inductive construction of the general center.
by Pablo Boixeda Alvarez.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Mathematics
9

Fan, Xiuling Broughton Roy. "Value-added products from chicken feather fibers and protein." Auburn, Ala, 2008. http://repo.lib.auburn.edu/EtdRoot/2008/SPRING/Polymer_and_Fiber_Engineering/Dissertation/Fan_Xiuling_15.pdf.

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10

Llimpe, Rojas Jorge Enrique. "Theoretical and practical approaches for novel composite evolute springs." Master's thesis, Pontificia Universidad Católica del Perú, 2018. http://tesis.pucp.edu.pe/repositorio/handle/123456789/11172.

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A combined experimental/analytical approach for an efficient evaluation of stiffness and characteristic curves of fiber reinforced plastic volute springs is presented in this work. Before performing the analysis mentioned in previous lines, in the early chapters, it can find the most common types of fibers, resins (matrices) and manufacturing processes used to produce composite laminates been briefly described. It also describes the analytical approaches that currently exist to determine the elastic constants of composites such as the longitudinal and transversal modulus, Poisson’s ratios and shear moduli; it also describes the improved and semi-empirical formulas to calculate the effective shear moduli and the transversal modulus. At the end of the chapter, some manufacturing methods of fiber reinforced plastic springs are described. Since fiber reinforced plastic volute springs are novel products, the fourth chapter presents and describes basic considerations that it must be taken into account when selecting material (fibers, resins, and additives) to manufacture these springs. At the end of the chapter, a method to produce volute springs is presented. The fifth chapter presents the elastic constant calculations for laminates used to manufacture volute springs. An experimental/analytical method has also been performed to determine in-plane and out-of-plane shear moduli since these material constants are of greater importance in the rate spring calculation hence any crosssection of these springs shows the major load being torsional. On the one hand the analytical method to calculate these shear moduli is based on Sumsion’s guidelines that use the theory developed by Lekhnitskii for anisotropic materials; on the other hand, it has been done torsion test of rectangular bars, which were manufactured using vacuum infusion method, to obtain shear moduli experimentally. Finally, calculated values of shear moduli are used to determine stiffness and characteristic curves of volute springs in an analytical and experimental method. It is proposed to use the in-plane shear modulus in the classical calculation method for steel volute springs and to compare results obtained with compression test results carried out on fiber reinforced plastic volute springs. Consistent results are achieved by performing this combined analytical and experimental method concluding that the best behavior of fiber reinforced plastic volute springs is when fibers have an orientation of +/ 45° concerning the main axis of the laminate.
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Books on the topic "Fibres de Springer":

1

Integrated Photonics Research Topical Meeting. (1993 Palm Springs, Calif.). Integrated photonics research: Summaries of papers presented at the Integrated Photonics Research Topical Meeting, March 22-24, 1993, Palm Springs, California. Washington, D.C: Optical Society of America, 1993.

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Fibre Optic Communication Springer Series in Optical Sciences. Springer, 2012.

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Ilvessalo-Pfaffli, Marja-Sisko. Fiber Atlas: Identification of Papermaking Fibers (Springer Series in Wood Science). Springer, 1995.

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Ilvessalo-Pfäffli, Marja-Sisko. Fiber Atlas: Identification of Papermaking Fibers (Springer Series in Wood Science). Springer, 1995.

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Schneider, K., and H. Zimmermann. Highly Sensitive Optical Receivers (Springer Series in Advanced Microelectronics). Springer, 2006.

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Islam, Mohammad N. Raman Amplifiers for Telecommunications 1: Physical Principles (Springer Series in Optical Sciences). Springer, 2003.

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Arditty, H. J., and John P. Dakin. Optical Fiber Sensors: Proceedings of the 6th International Conference, Ofs'89, Paris, France, September 18-20, 1989 (Springer Proceedings in Physics). Springer-Verlag, 1989.

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(Editor), Krishna M. Sivalingam, and Suresh Subramaniam (Editor), eds. Optical WDM Networks - Principles and Practice (The Springer International Series in Engineering and Computer Science). Springer, 2000.

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Chiang, Kin S., and Herbert Li. Nonlinear Photonics: Nonlinearities in Optics, Optoelectronics and Fiber Communications (Springer Series in Photonics, V. 8). Chinese Univ Pr, 2005.

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Book chapters on the topic "Fibres de Springer":

1

Nouchi, Pascale, Pierre Sillard, and Denis Molin. "Optical Fibres." In Springer Series in Optical Sciences, 55–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-20517-0_2.

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Love, Adrian. "Introduction to Optical Fibres." In Springer Theses, 41–52. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93970-4_5.

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Achtsnit, H. D. "Microporous Silica Fibres." In Springer Proceedings in Physics, 76–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-93313-4_9.

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Eckmann, Beno. "Espaces fibres et homotopie." In Springer Collected Works in Mathematics, 259–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-37339-8_16.

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Serre, Jean-Pierre. "Impossibilité de fibrer un espace euclidien par des fibres compactes." In Springer Collected Works in Mathematics, 3–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-39816-2_2.

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Abdullaev, Fatkhulla, Sergei Darmanyan, and Pulat Khabibullaev. "Short Pulses in Optical Fibres." In Springer Series in Nonlinear Dynamics, 5–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-87716-2_2.

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Kumar, A. "Soliton Propagation in Optical Fibres." In Springer Series in Nonlinear Dynamics, 328–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73193-8_22.

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Mirabedini, Azadeh. "Preparation and Characterisation of Novel Hybrid Hydrogel Fibres." In Springer Theses, 57–77. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95378-6_3.

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9

Nayar, B. K. "Optical Fibres with Organic Crystalline Cores." In Springer Proceedings in Physics, 142–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-47547-4_9.

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Payne, D. N. "Rare-Earth-Doped Fibres for Sensors." In Springer Proceedings in Physics, 534–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-75088-5_79.

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Conference papers on the topic "Fibres de Springer":

1

Elmoselhy, Salah A., Badr S. Azzam, and Sayed M. Metwalli. "Experimental Analysis of Laminated Fibrous Micro-Composite E-Springs for Vehicle Suspension Systems." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80780.

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Laminated fibrous micro-composite E-spring is an optimized trend of springs for vehicle suspension systems. The mechanical and frequency-response-based properties of these springs are investigated experimentally at both of the structural and constitutional levels. Thermoplastic-based and thermoset-based fibrous composite structures of the E-springs are modified at micro-scale with various additives and consequently they are compared. The experimental results reveal that additives of micrometer-sized particles of E-glass fibers as well as mineral clay to an ISO-phthalic polyester resin of the micro-composite E-spring can demonstrate superior characteristics that can surpass those of the traditional steel springs. Accordingly, micro-composite E-springs can displace both of the hydraulic dampers and steel springs in both of the passive and semi-active suspension systems in a reliable, simple, and cost-effective way.
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Sancaktar, Erol, and Sunil Gowrishankar. "Natural Frequencies of Composite Cylindrical Helical Springs Manufactured Using Filament Winding." In ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87830.

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We devised a novel technique to fabricate composite cylindrical helical springs using glass, and carbon fibers and in hybrid form, embedded in a matrix of epoxy resin, thus introducing a novel approach to spring making by incorporating the versatility of the filament winder. Our method allows us to vary the dimensions of the spring with considerable ease. This is accomplished in three stages. The first stage involves the proper selection of the resin and hardener. In the next stage, the glass and carbon fibers are completely soaked in a resin bath and encased in PVC tubing of three different inner diameters, which determine the wire diameter of the composite spring. Using a filament winding technique, these fiber filled tubes are wound on PVC mandrels of three different diameters. The natural frequencies of the manufactured composite springs were measured experimentally to study the influence of dimensional parameters, i.e., diameter ratios (D/d) and number of active turns (N = 6 and 7) on the free vibration frequencies. The natural frequencies for glass and carbon fiber and hybrid springs were measured using an MTS fatigue tester, and the resonance of the springs were captured using a digital camera.
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Shahinpoor, Mohsen, Martin W. J. Burmeister, and Wesley Hoffman. "Design, Modeling and Fabrication of Micro-Robotic Actuators With Ionic Polymeric Gel and SMA Micro-Muscles." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0626.

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Abstract Presented are the details for design and fabrication of a novel micro-robotic actuator in a few micron-size range. The model is in the form of contractile fiber bundles embedded in or around micron size helical compression springs. The fiber bundle is assumed to consist of a parallel array of contractile fibers made form either electrically or chemically (pH muscles) contractile ionic polymeric muscles such as polyacrylic acid plus sodium acrylate cross-linked with bisacrylamide (PAAM) or polyacrylonitrile (PAN) fibers or electrically contractile shape-memory alloy (SMA) fiber bundles. The proposed model considers the electrically or pH-induced contraction of the ionic polymeric fibers as well as resistive heating of the SMA fiber bundles in case of shape-memory alloys. A theoretical model is also presented for the dynamic modeling of such micron size robotic actuators. These robotic micro-actuators will open a new frontier to the micro-universes of biological, scientific, medical and engineering systems. On the fabrication side, helical compression springs and bellows in a few microns size range have been manufactured in our laboratories to serve as the main resilient structure for the micro-robotic actuator. In principle, any size micro-robotic linear actuator can be fabricated and tested in our laboratory. For the case of ionic polymeric gel fibers the model consists of an encapsulated hermetically sealed, helical compression spring-loaded cylindrical linear actuators containing a counterionic solution or electrolyte such as water+acetone, a cylindrical helical compression micro-spring and a collection of polymeric gel fibers (polyelectrolytes) such as polyvinyl alcohol (PVA) polyacrylic acid (PAA) or polyacrylamide. Furthermore, the helical micro-spring not only acts as a compression spring between the two hermetically sealed circular end-caps but contains snugly the polymeric gel fiber bundle and also acts as the cathode (anode) electrode -while the two actuator end-caps act as the other cathode (anode) electrodes. In this fashion, a DC electric field of a few volts per centimeter per gram of polymer gel can cause the polymer gel fiber bundle to contract (expand). This causes the compression spring to contract and pull the two end-caps closer to each other against the elastic resistance of the helical spring. By reversing the action by means of reversing the electric field polarities the gel is allowed to expand while the compression spring is also expanding and helping the linear expansion of the actuator since the polymeric gel muscle expands due to the induced alkalinity along the helical spring body. Thus, electrical control of the expansion and the contraction of the micro-robotic linear actuator is possible. A mathematical model is presented based on the proposed composite structure that takes into account all pertinent variables such as the pH of the gel fiber bundle, the pH of the surrounding medium, the hyperelastic parameters of the fiber bundle, the electrical variables of the gel, the electric field strength, the pH field strength and all pertinent dimensions followed by some numerical and experimental simulations and data. For the second model, we consider the fiber bundle of SMA to be either circumscribed inside a micron size helical compression spring with flat heads or in parallel with a number helical compression springs, end-capped by two parallel circular plates with embedded electrodes to which the ends of the SMA fibers are secured. Thus, the fibers can be electrically heated and subsequently contracted to compress the helical compression spring back and forth. Design details are first described. In essence the dynamic behavior of the actuator depends on the interaction between the current supplied to the wires and the heat transfer from the wires. Further, a mathematical model is presented to simulate the electro-thermo-mechanics of motion of such actuators. The proposed model takes into account all pertinent variables such as the strain ϵ, the temperature of the fibers T(t) as a function of time t, the ambient temperature T0, the martensite fraction ξ, the helical compression spring constant k and the overall heat transfer coefficient h. Numerical simulations are then carried out and the results are compared with experimental observations of a number of fabricated systems in a size range of a few mcrons.
4

Djomseu, Patricia, Max A. Sardou, and Thomas R. Berg. "Composite Coil Spring Development and Testing." In IEEE/ASME/ASCE 2008 Joint Rail Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/jrc2008-63019.

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This paper will present the development of composite coil springs made from glass-fiber-epoxy materials. It will also review the results from prototype springs that have been manufactured and tested. Sardou S.A. has been developing and manufacturing composite structures and components of various designs for over 27 years. This experience, especially with composite torsion springs, has led to development, prototype production, and testing of several designs of composite coil springs. The design takes advantage of commercially available glass fiber and epoxy materials. The development process led to proprietary design methods and computer models to simulate unique configurations and material characteristics. The development process also allows design of composite springs for the same or smaller design volume as steel coil springs with comparable spring characteristics. The manufacturing methods that are used apply existing lost mold and winding processes in unique ways to produce prototype composite coils springs. These methods were also developed considering scaling-up and automation for volume production. Several generations of prototype composite coil springs have been produced and tested. Each generation has advanced the design and manufacturing methods. Several features of composite coil springs including light weight, dynamic response, flexibility of design, and fatigue resistance have been demonstrated through testing. Depending the steel counterpart considered, composite coils springs offer weight saving of about 75%, fatigue life improvement, no rust, no creep, and no notch sensitivity at a cost close to that of a steel spring.
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Yalin, Azer P., Adam R. Reynolds, Sachin Joshi, Morgan W. Defoort, Bryan Willson, Yuji Matsuura, and Mitsunobu Miyagi. "Development of a Fiber Delivered Laser Ignition System for Natural Gas Engines." In ASME 2006 Internal Combustion Engine Division Spring Technical Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/ices2006-1370.

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Laser ignition is viewed as a potential future technology for advanced high-efficiency low-emission natural gas engines. However, in order to make laser ignition systems more practical, thereby enabling them to transition from the laboratory to industrial settings, there is a need to develop fiber optically delivered ignition systems. Recent work at Colorado State University has shown the possibility of using coated hollow fibers for spark delivery and has demonstrated laser ignition and operation of a single engine cylinder using hollow fiber delivery. In order to practically operate a multiple cylinder engine, we envisage a simple and low-cost system based upon a single laser source being delivered (“multiplexed”) through multiple fibers to multiple engine cylinders. In this paper, we report on the design, development, and initial bench-top testing of a multiplexer. Bench-top testing showed that the multiplexer can be positioned with the required accuracy and precision for launching into fiber optics, and can be switched at the relatively high switching rates needed to operate modern natural gas engines. Another test employed the multiplexer to alternately launch laser pulses into a pair of hollow fibers in a way that allows spark creation downstream of the fibers.
6

Watson, Hugh A. "A linear array of twelve graded-index lenses butted coaxially against single-mode fibers using silicon V-groove technology." In Integrated Photonics Research. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/ipr.1991.mc7.

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The AT&T MAC-II optical fiber connector uses silicon V-groove technology to align an array of twelve fibers. The fibers on each side of the connector are epoxied to a pair of silicon V-groove blocks, as illustrated in Fig. 1. Steel alignment rods which rest under spring pressure in larger V-grooves at the ends of the blocks serve to align the two sides of the connector. The center-to-center spacing between the fibers is 0.25 mm.
7

Stacey, Jonathan P., Matthew P. O’Donnell, and Mark Schenk. "Thermal Prestress in Composite Compliant Shell Mechanisms." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85826.

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Due to the anisotropic nature of fibre-reinforced laminates, thermally-induced internal stresses can remain in the material after manufacture. Mismatches between coefficients of thermal expansion are especially prominent in thin shells with fewer plies or large angle variations. Such stresses cause out-of-plane warping and are therefore often deliberately avoided. Utilising their effects on structural behaviour however, can enable stiffness-tailored composite compliant mechanisms. Work detailed in this paper aims to exploit thermal prestress to reduce the torsional stiffness of cross-ply tape laminate springs. An extension of an analytical tape spring model with composite thermal analysis is presented, which shows that thermal effects cause significant changes to the energy landscapes of thin composite shells. Tape springs that would otherwise be monostable structures become bistable and exhibit greater ranges of low-energy twisting when thermally-induced prestress is present. Predicted shell geometries are compared with finite element models and manufactured samples, showing good agreement between all approaches. The limited feasibility of zero torsional stiffness composite tape springs is discussed, as well as wider challenges involved in manufacturing prestressed composite compliant mechanisms such as fibre misalignment and moisture ingress.
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Foglesong, Tim, Rob Stone, and John Parmigiani. "Dynamics Modeling to Inform Design Optimization." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34412.

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This paper presents the methods employed in modeling a vibratory conveyor for use in model-based design optimization. The conveyor, essentially a large table whose top oscillates at an angle off of horizontal, uses springs between the drive mechanism and the tabletop to directly apply a sinusoidal excitation. These springs prevent the system from losing response amplitude as load is increased. The manufacturer is having difficulty optimizing performance and reliability in newer designs, and has requested a model-based approach to the design optimization. This study discusses the initial steps taken in modeling the original mechanism design, specifically the dynamic model and experimental determination of the necessary spring constants. The first full iteration of the model starts with low detail and simplified geometry, with a plan to add complexity as needed to improve accuracy. In the initial model, the parallel springs in the tabletop suspension are combined, bypassing the spring mounting geometry, and tested as one large spring. The drive mechanism springs, bars of fiber reinforced plastic (FRP), are more meticulously tested in a tensile testing machine. The resulting spring constants are used in the initial model to calculate the sinusoidal response of the tabletop at any given input frequency. The deflection response per time of the tabletop is then measured and compared to the model. Conclusions detail the initial model’s accuracy and Future Work examines how to bring it in closer agreement with the real machine’s sinusoidal response.
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Yee, J. C. H., O. Soykasap, and S. Pellegrino. "Carbon Fibre Reinforced Plastic Tape Springs." In 45th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics & Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2004. http://dx.doi.org/10.2514/6.2004-1819.

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Li, He, and George Lykotrafitis. "A Coarse-Grained Molecular Dynamics Model for Sickle Hemoglobin Fibers." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37980.

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The intracellular polymerization of deoxy sickle cell hemoglobin (HbS) has been identified as the main cause of sickle cell disease. Therefore, the material properties and biomechanical behavior of polymerized HbS fibers have been a topic of intense research interest. A solvent-free coarse-grained molecular dynamics (CGMD) model has been developed and it represents a single hemoglobin fiber with four tightly bonded chains, each of which comprises soft particles. A harmonic spring potential, a bending potential, a torsional potential, and a Lennard-Jones potential are introduced along with a Langevin thermostat to simulate the behavior of a polymerized HbS fiber in the cytoplasm. The parameters of the potentials are identified via comparison of the simulation results with the experimentally measured values of bending and torsional rigidity of single HbS fibers. The proposed model is able to very efficiently simulate HbS fibers of 20 nm diameter and on the order of μm length-scale and μs time-scale. The model is validated by comparison with published experimental results and then it is used to investigate the interaction between two HbS fibers, and to study the fiber zippering process during heterogeneous fiber growth.

Reports on the topic "Fibres de Springer":

1

Hot Springs-Garrison Fiber Optic Project. Office of Scientific and Technical Information (OSTI), October 1994. http://dx.doi.org/10.2172/10121282.

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AN ANALYTICAL METHOD FOR EVALUATING THE DEFLECTION AND LOAD-BEARING AND ENERGY ABSORPTION CAPACITY OF ROCKFALL RING NETS CONSIDERING MULTIFACTOR INFLUENCE. The Hong Kong Institute of Steel Construction, September 2022. http://dx.doi.org/10.18057/ijasc.2022.18.3.1.

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In this study, an analytical method for evaluating the structural performance, including maximum deflection, load-bearing, and energy absorption capacity of a steel wire-ring net, was proposed to effectively design the ring net of the flexible barrier systems. Puncture tests of the ring nets and two-point traction tests of the three-ring chains with various wire-ring specifications were conducted. Correlation analysis was used to test the results between ring nets and chains, revealing that three structural performance indicators of the test specimens were strongly related. The ring net’s structural performance was affected specifically by ring chains on the shortest load transfer path. Accordingly, a three-ring chain with a flexible boundary corresponded to a fibre–spring element. A three-dimensional analytical model of the ring net was established. Explicit formulas for computing the three indicators of the ring net were derived. Comprehensive quasi-static and impact tests, using different shapes and sizes of punching devices, were conducted, providing valuable data to calibrate and validate this analytical method. The ability of the model in yielding consistent results when implemented at the structure scale was then assessed, based on the data of full-scale impact tests on a 1500kJ-energy rockfall barrier. Lastly, the effects of various factors, such as single ring geometry, the length–width ratio of the net, loading area size, boundary stiffness, and load rate, influencing the structural performance indicators of the ring net were investigated, respectively.

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