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Dissertations / Theses on the topic 'Springer fibers'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

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<br>Cataloged from the official PDF of thesis.<br>Includes bibliographical references (pages 149-152).<br>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 conne

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2

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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3

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<br>Cataloged from the official PDF of thesis.<br>Includes bibliographical references (pages 125-128).<br>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

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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

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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 g

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6

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

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7

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

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8

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 e

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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

Liu, Yang. "Calibration of Glass Fiber Microcantilevers." Ohio University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1268336942.

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11

Atkinson, William Drew. "CARBON FIBER LEAF SPRINGS FOR ADAPTIVE CROSS COUNTRY SKIING." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/370.

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This work describes the development of a custom sit ski for US Ski Team paralympian Greg Mallory from concept through prototype fabrication. The ski consists of a custom seat molded specifically for the athlete, carbon fiber leaf springs, and a custom binding attachment system compatible with NNN style cross country bindings. The sit ski is designed to maximize poling power through the use of an upright rather than reclined seating position, allowing for increased utilization of core muscle strength. The springs were designed based on information gathered by a custom National Instruments da

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12

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 rati

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13

Taylor, Robert Paul. "Finite Element Analysis of the Application of Synthetic Fiber Ropes to Reduce Seismic Response of Simply Supported Single Span Bridges." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34051.

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Movement of a bridge superstructure during a seismic event can result in damage to the bridge or even collapse of the span. An incapacitated bridge is a life-safety issue due directly to the damaged bridge and the possible loss of a life-line. A lost bridge can be expensive to repair at a time when a region's resources are most strained and a compromised commercial route could result in losses to the regional economy. This thesis investigates the use of Snapping-Cable Energy Dissipators (SCEDs) to restrain a simply supported single span bridge subjected to three-dimensional seismic loads.

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14

Motley, Michael Rembert. "Finite Element Analysis of the Application of Synthetic Fiber Ropes to Reduce Blast Response of Frames." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/36155.

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Blast resistance has recently become increasingly relevant for structural engineers. Blast loads are created by explosive devices that, upon detonation, create pressure loads that are much higher than most that a structure would ever experience. While there are many types of blast loads that are impossible to adequately prepare for, methods are presently being developed to mitigate these loads. This research investigates the possibility of using synthetic fiber ropes as a means of blast resistance. This is the third phase of a multi-stage research endeavor whose goal is to analyze Snapping

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15

Rueckert, Cheryl B. "Evaluation of preferential energy absorption in earlywood and latewood fibers of loblolly pine in cyclic compression." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/5805.

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16

Lingnau, Werner August Leonhard. "Substitution of maize with high fibre by-products in concentrates supplemented to dairy cows grazing kikuyu/ryegrass pasture during spring." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6459.

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Thesis (MScAgric (Animal Sciences))--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: Kikuyu over-sown with ryegrass forms the basis of pasture based systems in the Southern Cape. During early spring, energy is the first limiting nutrient in kikuyu/ryegrass pasture, supplementation is thus essential. Supplementation consists mainly of high starch concentrates (high maize inclusion), which is expensive and could negatively affect rumen parameters. The objective of this study was to determine if milk production could be improved or maintained, and if the rumen environment would be impr

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17

Mao, Huina. "Numerical and Experimental Studies of Deployment Dynamics of Space Webs and CubeSat Booms." Doctoral thesis, KTH, Farkost och flyg, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-206594.

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In this thesis, experiments and simulations are performed to study the deployment dynamics of space webs and space booms, focusing on the deployment and stabilization phases of the space web and the behavior of the bi-stable tape spring booms after long-term stowage. The space web, Suaineadh, was launched onboard the sounding rocket REXUS-12 from the Swedish launch base Esrange in Kiruna on 19 March 2012. It served as a technology demonstrator for a space web. A reaction wheel was used to actively control the deployment and stabilization states of the 2×2 m2 space web. After ejection from the

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18

Верещага, Б. А. "Дослідження впливу технології виготовлення, складу ламінату, термічної обробки на фізико-механічні властивості полімерної, композитної пластинчастої пружини". Master's thesis, Сумський державний університет, 2021. https://essuir.sumdu.edu.ua/handle/123456789/86489.

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Верещага Богдан Анатолійович. Дослідження впливу технології виготовлення, складу ламінату, термічної обробки на фізико-механічні властивості полімерної, композитної пластинчастої пружини. Кваліфікаційна робота на здобуття ступеня магістр за спеціальністю 132.00.02 – Прикладне матеріалознавство. – Сумський державний університет, 2021р. Кваліфікаційна робота присвячена дослідженню впливу технології виготовлення, фізико-механічних властивостей, складу ламінату, термічної обробки на фізико-механічні властивості полімерної, композитної пластинчастої пружини. За результатами досліджень системно

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19

Li, Yung-yi, and 李勇圻. "The Compression and Fatigue Effect of Different Fibers of Braided Composite Sprial Spring." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/61947133942376055337.

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碩士<br>逢甲大學<br>紡織工程所<br>94<br>In this thesis, composite springs were made of different fiber prepreg .ie carbon fibers, E-glass fibers and Kevlar 49 fibers, with relevant mechanical sprig constant (K) and fatigue tested after parts cured. According to the experimental results, the structure of composite springs mixed with carbon fibers and glass fibers have the higher load per unit compression displacement which is better than other composition. After comparing with other structures, the C50G50 structure of spiral spring has good properties with more cost effective. Its load per unit compr

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20

Lin, Yi-shin, and 林億鑫. "Vibration Analysis of Fiber-Reinforced Composite Helical Springs with Rectangular Cross Sections." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/56562878736033179333.

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碩士<br>國立中興大學<br>機械工程學系所<br>103<br>In this thesis, a finite element model based on two-noded straight beam finite elements, with each node of nine degrees of freedom, is developed to study the dynamic characteristics of helical springs having rectangular cross sections. The helical springs could be made of isotropic materials or fiber-reinforced composite materials. The straight beam element being adopted has included the effects of the transverse shear deformation, torsion, cross-section warping, chordwise curvature, axial, transversal and lateral displacements. The equation of motion of the s

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21

Chiu, Chun-Kai, and 邱俊凱. "Impact and Damping Properties of Braided Composite Spiral Spring with Different Fibres." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/69769891638446312922.

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碩士<br>逢甲大學<br>紡織工程所<br>94<br>In this experiment, composite spiral springs were made with three kinds of fibre prepreg i.e carbon fibres, kevlar fibres and E-glass fibres. Different kinds of cured springs were then assembled as respective shock absorber systems and their performance such as the compression load under 1-in deformation, the damping properties of assembled absorber system and the lateral impact resistance were explored. The experimental results show that the composite spring made of carbon / E-glass composition structure can gain the highest compression load under 1-in deforma

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22

(7043354), Himal Agrawal. "Manufacturing and Testing of Composite Hybrid Leaf Spring for Automotive Applications." Thesis, 2019.

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Leaf springs are a part of the suspension system attached between the axle and the chassis of the vehicle to support weight and provide shock absorbing capacity of the vehicle. For more than half a century the leaf springs are being made of steel which increases the weight of the vehicle and is prone to rusting and failure. The current study explores the feasibility of composite leaf spring to reduce weight by designing, manufacturing and testing the leaf spring for the required load cases. An off the shelf leaf spring of Ford F-150 is chosen for making of composite hybrid spring prototype. Th

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23

Chen, Hung-Chin, and 陳宏晉. "Studies of Free Vibration of Fiber-Reinforced Composite Helical Springs with Circular Cross Sections Using Circularly Curved Beam Finite Elements." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/80223243921081227798.

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碩士<br>國立中興大學<br>機械工程學系所<br>103<br>In this thesis, a three-node, 6 degree of freedom per node, curved beam element including the effect of initial curvature and torsion of beam is proposed. In this curved beam element, the lateral and axial displacements, as well as the deformation due to both twisting and shearing of beam are also considered. The curved beam element is employed to analyze circular helical springs with circular cross section, where the springs are made of unidirectional fiber-reinforced composite layers having a preselected set of lamination angles. To study the initial tor

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24

Huang, Yi Shang, and 黃衣聖. "Comparisons of Curved and Straight Beam Finite Elements on Free Vibration Analysis of Rectangular Cross-Section Helical Springs made of Fiber-Reinforced Composite Materials." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/00385617958224759536.

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碩士<br>國立中興大學<br>機械工程學系所<br>105<br>In this thesis the free vibration of rectangular cross-section helical springs is studied using two types of beam element. The first type element is the 3 node, 18 degree-of-freedom, curved beam element and the second, the 3 node, 23 degree-of-freedom, straight beam finite element. The springs are assumed to be made of isotropic materials or fiber-reinforced composite materials. In both elements, the axial and lateral displacement, as well as the deformation due to both shearing and twisting of beam are considered, while in straight beam element, additional

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