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1
Bardou, Adrien. "Development of GNSS Type Processing for the Characterization of the Mobile Propagation Channel". Thesis, KTH, Fastigheter och byggande, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-298308.
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Mobile communication systems are undergoing significant development on increasingly wide frequency bands (5G in particular). To support this development, a detailed characterization of the propagation of electromagnetic waves in L, S and C band between a station (satellite, airborne or ground) and a mobile platform is necessary to analyze and model the phenomena that have a decisive impact on the performance, availability and operability of systems. The environments of interest are complex (urban environment for example) and include a wide range of different elements (buildings, pylons, trees etc.) that will have an impact on the signal received by a mobile in reception. These needs motivated the development of a simulator using an enhanced hybrid physicalstatistical model for Land Mobile Satellite (LMS) propagation Channel. This simulator has been developed by a PhD student and presented in [Ait+13]. This study has been conducted by the ONERA on behalf of the CNES. The Simplified CHannel for Urban Navigation (SCHUN) ensure a wideband characterization of the channel, with realistic multipath modelling and is dedicated to the testing of GNSS systems. However, this model must be validated in S and C bands and measurement campaigns have been carried out to compare simulated and experimental data. In this work, the data corresponding to a trajectory with alternatively LOS and NLOS situation in an urban canyon have been derived from a measurement campaign carried out in Saint-Lary in S and C frequency bands. The post-processing of the data performed in the S frequency band has been performed using a pre-existing algorithm implemented at ONERA relying upon acquisition and tracking signal processing principles of GNSS. This trajectory has been simulated along with its surroundings using SCHUN. The Channel Impulse Response has been computed to derive multipath characteristics. Comparisons have been made between simulations and experimental data and have shown great concordance. Future works would be first to extend this comparison to C-bands and then to statistically simulate a virtual city corresponding to the town in which the experiment has been carried out to complete the validation.Mobila kommunikationssystem genomgår en betydande utveckling på allt bredare frekvensband (särskilt 5G). För att stödja denna utveckling krävs en detaljerad karakterisering av utbredningen av elektromagnetiska vågor i L-, S- och C-banden mellan en station (satellit, luftburen eller markbaserad) och en mobil plattform för att analysera och modellera de fenomen som har en avgörande inverkan på systemens prestanda, tillgänglighet och funktionsduglighet. De intressanta miljöerna är komplexa (t.ex. stadsmiljöer) och innehåller en mängd olika element (byggnader, master, träd osv.) som påverkar den signal som tas emot av en mobil i mottagning. Dessa behov motiverade utvecklingen av en simulator som använder en förbättrad fysisk-statistisk hybridmodell för landmobila satellituppbredningskanaler (LMS). Denna simulator har utvecklats av en doktorand och presenteras i [Ait+13]. Denna studie har genomförts av ONERA på uppdrag av CNES. Simplified CHannel for Urban Navigation (SCHUN) säkerställer en bredbandig karakterisering av kanalen med realistisk multipath-modellering och är avsedd för testning av GNSS-system. Denna modell måste dock valideras i S- och C-banden och mätkampanjer har genomförts för att jämföra simulerade och experimentella data. I detta arbete har data som motsvarar en bana med alternativt LOS- och NLOS-situation i en urban canyon tagits fram från en mätkampanj som utfördes i Saint-Lary i S- och C-banden. Efterbearbetningen av data från S-frekvensbandet har utförts med hjälp av en befintlig algoritm som implementerats vid ONERA och som bygger på GNSS-signalbehandlingsprinciperna för förvärv och spårning. Denna bana har simulerats tillsammans med dess omgivningar med hjälp av SCHUN. Kanalimpulsresponsen har beräknats för att få fram egenskaperna för multipelväg. Jämförelser har gjorts mellan simuleringar och experimentella data och har visat stor överensstämmelse. Framtida arbeten skulle vara att först utvidga denna jämförelse till C-bandet och sedan statistiskt simulera en virtuell stad som motsvarar den stad där experimentet utfördes för att slutföra valideringen.
2
Beckheinrich, Jamila [Verfasser], Harald [Akademischer Betreuer] Schuh, Harald [Gutachter] Schuh, Steffen [Gutachter] Schön y Jens [Gutachter] Wickert. "GPS reflectometry : innovative flood monitoring at the Mekong Delta / Jamila Beckheinrich ; Gutachter: Harald Schuh, Steffen Schön, Jens Wickert ; Betreuer: Harald Schuh". Berlin : Technische Universität Berlin, 2016. http://d-nb.info/1156270294/34.
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Kotzerke, Kristina [Verfasser], Michael P. [Akademischer Betreuer] Schön, Holger [Akademischer Betreuer] Reichardt y Peter [Akademischer Betreuer] Schu. "Immunomodulatory activity of murine keratinocyte-derived exosomes / Kristina Kotzerke. Gutachter: Holger Reichardt ; Peter Schu. Betreuer: Michael P. Schön". Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2015. http://d-nb.info/1065881932/34.
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Vuletic, Mirjana Borodin Alexei Borodin Alexei. "The Pfaffian Schur process /". Diss., Pasadena, Calif. : California Institute of Technology, 2009. http://resolver.caltech.edu/CaltechETD:etd-05292009-161729.
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Schut, Jacobus Arno Gérard Jean-François Stamm Manfred Dumon Michel. "Mélanges du polystyrène syndiotactique et d'un système epoxy-amine thermodurcissable". Villeurbanne : Doc'INSA, 2004. http://docinsa.insa-lyon.fr/these/2003/schut/index.html.
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Thèse doctorat : Matériaux Polymères et Composites : INSA LYON : 2003.Thèse rédigée en anglais. Résumé étendu en français p. 212-243. Titre provenant de l'écran-titre. Bibliogr. p. 260-281.
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Örtl, Katrin. "Bunt sind schon die Wände". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-79999.
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Bei einem Fest fragt sich der Veranstalter üblicherweise: Hält das Wetter? Reichen Kaffee und Kuchen? Bei dem Familienlesetag in der Stadtbibliothek Radebeul-West fragten wir Mitarbeiter uns außerdem: Was werden unsere Leserinnen und Leser zu den Neuerungen sagen? Was zu den Farben? Zur Burg? Zur veränderten Aufstellung? ...
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Beck, Aimée. "Maria Schug-Kösters (1900-1975)". Diss., lmu, 2009. http://nbn-resolving.de/urn:nbn:de:bvb:19-102034.
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Ganz, Hans Rudolf Ganz Hans Rudolf Ganz Hans Rudolf. "Mauerwerksscheiben unter Normalkraft und Schub /". Zürich : Institut für Baustatik und Konstruktion - ETH, 1985. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=7849.
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Henke, Anne E. "Young modules and Schur subalgebras". Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301862.
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Dexter, Cache Porter. "Schur Rings over Infinite Groups". BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/8831.
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A Schur ring is a subring of the group algebra with a basis that is formed by a partition of the group. These subrings were initially used to study finite permutation groups, and classifications of Schur rings over various finite groups have been studied. Here we investigate Schur rings over various infinite groups, including free groups. We classify Schur rings over the infinite cyclic group.
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Woodcock, David J. "Schur algebras, combinatorics, and cohomology". Thesis, University of Warwick, 1991. http://wrap.warwick.ac.uk/108093/.
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Let G = GLn(k), the group of all invertible n x n matrices over an infinite field k. In this thesis we explore the cohomological relationship between a Schur algebra S(G) for G and the subalgebra S(B) corresponding to a Borel subgroup B of G. Our main motivation is the question of whether there is an analogue of the Kempf Vanishing Theorem in this setting. We place our study in a more general framework, defining subalgebras S(Ω,Г) of S(G) associated with certain intersections of parabolic subgroups of G, and investigate the connection between S(Ω,Г) and the subalgebra S(S(Ω,Ø). We define modules for S(Ω,Г) which serve as analogues for the Weyl modules for S(G). We produce bases for these Weyl modules and thereby show that S(Ω,Г) is a quasi- hereditary algebra. We find two-step projective presentations for the Weyl modules over subalgebras S(Ω,Г) of S(Ω,Г). and in special cases find projective resolutions. We use these to prove results which provide partial information on the existence of an analogue for the Kempf Vanishing Theorem, and on related questions. We derive a character formula for the Weyl modules which can be regarded as an extension of the Jacobi-Trudi identity for Schur functions. The methods used in this thesis are in the main elementary, with a heavy reliance on direct combinatorial arguments.
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Schul, Asusa [Verfasser]. "Verlagerung der Betriebsratszuständigkeit. / Asusa Schul". Berlin : Duncker & Humblot, 2009. http://d-nb.info/1238361471/34.
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Riehl, Amanda. "Ribbon Schur functions and permutation patterns". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3307163.
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Thesis (Ph. D.)--University of California, San Diego, 2008.Title from first page of PDF file (viewed July 9, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 154-157).
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Schön, André [Verfasser]. "Gleichspannungswandler für die Hochspannungsgleichstromübertragung / André Schön". München : Verlag Dr. Hut, 2015. http://d-nb.info/1079768246/34.
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Schlenker, Lars, Jana Riedel y Claudia Albrecht. "Ist das jetzt schon E-Learning?" Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-141001.
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Digitale Medien in der Lehre einzusetzen birgt vielfältige Potentiale, die jedoch durch Hochschullehrende in Abhängigkeit von ihren Kompetenzen, Einstellungen und den Rahmenbedingungen, unter denen Lehre geplant und durchgeführt wird, häufig nicht vollständig ausgeschöpft werden.
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Luhmann, Maike. "Heute schon gegruschelt? : Nutzertypen des StudiVZ /". Marburg : Tectum-Verl, 2008. http://d-nb.info/990119785/04.
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Kerby, Brent L. "Rational Schur Rings over Abelian Groups". BYU ScholarsArchive, 2008. https://scholarsarchive.byu.edu/etd/1491.
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In 1993, Muzychuk showed that the rational S-rings over a cyclic group Z_n are in one-to-one correspondence with sublattices of the divisor lattice of n, or equivalently, with sublattices of the lattice of subgroups of Z_n. This idea is easily extended to show that for any finite group G, sublattices of the lattice of characteristic subgroups of G give rise to rational S-rings over G in a natural way. Our main result is that any finite group may be represented as the automorphism group of such a rational S-ring over an abelian p-group. In order to show this, we first give a complete description of the automorphism classes and characteristic subgroups of finite abelian groups. We show that for a large class of abelian groups, including all those of odd order, the lattice of characteristic subgroups is distributive. We also prove a converse to the well-known result of Muzychuk that two S-rings over a cyclic group are isomorphic if and only if they coincide; namely, we show that over a group which is not cyclic, there always exist distinct isomorphic S-rings. Finally, we show that the automorphism group of any S-ring over a cyclic group is abelian.
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Entova, Aizenbud Inna. "Schur Weyl duality in complex rank". Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/104601.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mathematics, 2016.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 207-208).
This thesis gives an analogue to the classical Schur-Weyl duality in the setting of Deligne categories. Given a finite-dimensional unital vector space V (i.e. a vector space V with a distinguished non-zero vector 1) we give a definition of a complex tensor power of V. This is an Ind-object of the Deligne category Rep(St) equipped with a natural action of gl(V). This construction allows us to describe a duality between the abelian envelope of the category Rep(St) and a localization of the category Op/t,v (the parabolic category 0 for gl(V) associated with the pair (V, 1)). In particular, we obtain an exact contravariant functor SWt from the category Repab(St) (the abelian envelope of the category Rep(St)) to a certain quotient of the category Op/t v. This quotient, denoted by 0 p/t v, is obtained by taking the full subcategory of Op/t v consisting of modules of degree t, and localizing by the subcategory of finite dimensional modules. It turns out that the contravariant functor SWt makes Op/t v a Serre quotient of the category Repab(St)OP, and the kernel of SWt can be explicitly described. In the second part of this thesis, we consider the case when V = C[infinity] . We define the appropriate version of the parabolic category 0 and its localization, and show that the latter is equivalent to a "restricted" inverse limit of categories Op/t1CN with N tending to infinity. The Schur-Weyl functors SWt,CN then give an anti-equivalence between the category Op[infinity]/t C[infinity]and the category Repab(Se). This duality provides an unexpected tensor structure on the category Op[infinity]/t C[infinity].
by Inna Entova Aizenbud.
Ph. D.
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Santana, Ana Paula Jacinto. "Some subalgebras of the Schur algebra". Thesis, University of Warwick, 1990. http://wrap.warwick.ac.uk/107950/.
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In this thesis we study some subalgebras of the Schur algebra for the general linear group GLn(k) particularly the Schur algebra S(B+) for the Borel subgroup B+ of GLn(k). In many ways it is easier to work in S(B+) than in the more complicated algebra S(GLn(k). Using the properties of S(B+) we give a new treatment of the Weyl modules for GLn(k). We then construct 2-step minimal projective resolutions of the irreducible S(B+)-modules and from these we obtain very easily 2-step projective resolutions of the Weyl modules for GLn(k). We study the Cartan invariants of S(B+) and show that under certain conditions they satisfy an interesting identity. For particular cases of the field k and of the integer n we prove several results on minimal projective resolutions of the irreducible S(B+)-modules. The methods we use are combinatorial and do not involve algebraic group theory.
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Rafilipojaona, Fanasina Alinirina. "Nombres de Schur classiques et faibles". Thesis, Littoral, 2015. http://www.theses.fr/2015DUNK0368/document.
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Le thème central de cette thèse porte sur des partitions en n parties de l'intervalle entier [1, N] = {1,2,...,N} excluant la présence, dans chaque partie, de solution de l'équation x + y = z dans le cas classique, ou seulement de telles solutions avec x ≠ y dans le cas faible. Pour n donné, le plus grand N admissible dans le cas classique se note S(n) et s'appelle le n-ème nombre de Schur ; dans le cas faible, il se note WS(n) et s'appelle le n-ème nombre de Schur faible. Bien qu'introduits il y a plusieurs décénnies déjà, et même il y a un siècle dans le cas classique, on ne sait encore que très peu de choses au sujet de ces nombres. En particulier, S(n) et WS(n) ne sont exactement connus que pour n ≤ 4. Cette thèse est composée de deux chapitres : le premier revisite des encadrements connus sur les nombres de Schur classiques et faibles, et le second est consacré à la construction de nouveaux minorants des nombres de Schur faibles WS(n) pour n = 7, 8 et 9. Nous introduisons, dans le premier chapitre, les ensembles t-libres de sommes, t ∊ ℕ, dont l'utilisation permet de généraliser et d'unifier diverses démonstrations de majorants des S(n) et WS(n). Nous obtenons également une relation entre WS(n + 1) et WS(n). Dans le second chapitre, nous initions l'étude de certaines partitions hautement structurées présentant un potentiel intéressant pour le problème de minorer les nombres WS(n). Effectivement, avec des algorithmes de recherche ne portant que sur ces partitions, nous retrouvons les meilleurs minorants connus sur WS(n) pour 1 ≤ n ≤ 6, et nous améliorons significativement ceux pour 7 ≤ n ≤ 9The main theme of this thesis is about partitions in n parts of the integer interval [1, N] = {1,2,...N} excluding the presence, in each part, of solutions of the equation x + y = z in the classical case, or only of such solution with x ≠ y in the weak case. For given n, the largest admissible N in the classical case, it is denoted S(n) and called the n-th Schur number ; in the weak case, it is denoted WS(n) and called the n-th weak Schur number. Even though these numbers were already introduced several decades ago, and even a century ago in the classical case, almost nothing is known about them. In particular, S(n) and WS(n) are exactly known for n ≤ 4. This thesis comprises two chapters :the first one revisits known lower and upper bounds on the classical weak Schur numbers, and the second one is dedicated to the construction of the new lower bounds on the weak Schur numbers WS(n) for n = 7,8 and 9. In the first chapter, we introduce the t-sumfree sets, t ∊ ℕ, which allow us to generalize and unify various proofs concerning upper bounds on S(n) and WS(n). We also obtain a new relationship between WS(n + 1) and WS(n).In the second chapter, we initiate the study of certain highly structured partitions which present an interesting potential for the problem of bounding the numbers WS(n) from below. Indeed, with search algorithms considering only partitions, we rediscover the best known lower bounds on WS(n) for 1 ≤ n ≤ 6, and we significatively improve those for 7 ≤ n ≤ 9
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Merrill, Julia [Verfasser]. "Stimmen – schön schrecklich oder schrecklich schön? : Beschreibung, Bewertung und Wirkung des vokalen Ausdrucks in der Musik / Julia Merrill". Kassel : Kassel University Press, 2019. http://d-nb.info/1188347942/34.
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Schuh, Elena [Verfasser]. "Chondrocyte response to matrix elasticity / Elena Schuh". Lübeck : Zentrale Hochschulbibliothek Lübeck, 2011. http://d-nb.info/1009792164/34.
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Steen, Naomi Mary. "Unbounded generalisations of Schur and operator multipliers". Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603070.
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Bounded Schur multipliers were introduced and characterised several decades ago, and various applications of this algebra of functions have been discovered. More recently, research into different classes of unbounded multipliers has been carried out. In this thesis the theory of one such class, that of the local Schur multipliers, is extended in different settings. A dilation of minimal Stinespring representations of completely positive, bimodular maps on spaces of compact operators is obtained, and used to establish an unbounded version of Stinespring's Theorem. This theorem is applied to obtain a characterisation of positive local Schur multipliers. In addition, a relation is demonstrated between operator monotone functions and positive local Schur multipliers, and a description is given of positive multipliers of Toeplitz type. The theory of local multipliers is extended to the multidimensional setting, and a characterisation of such functions is obtained. Local operator multipliers are introduced as a non-commutative e analogue of local Schur multipliers and a description is provided, extending previously known results concerning completely bounded operator multipliers. Positive multipliers are defined in this setting) and characterised using elements of canonical positive cones. The two-dimensional Fourier algebra A2(G) of a compact, abelian group G is considered, and a number of results are obtained concerning the Arens product on its dual, VN(G) ®uh VN(G). It is shown that A2 (G) may be viewed as a left VN(G) ®ub VN(G)-module, and thus certain results of Eyroard are extended to the two-dimensional setting, leading to the establishment of a condition equivalent to the homeomorphic identification of the Gelfand spectrum of A2(G) with C2 .
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Richter, Petra. "Schneiden Sie noch oder cutten Sie schon?" Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-164428.
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Auf einer Fläche von 50 m2 konnten Besucher der Städtischen Bibliotheken Dresden High-Tech-Geräte, wie 3D-Drucker, Lasercutter sowie Ausrüstungen und Werkzeuge, zum kreativen Gestalten kennenlernen und nutzen. Von Ende November bis zum 20. Dezember 2014 gastierte in der Haupt- und Musikbibliothek ein Fabrikationslabor, kurz: FabLab. Fabrikationslabore sind offene Werkstätten für alle, die etwas Bauen und die dazu notwendigen Geräte und Räumlichkeiten mit anderen Menschen teilen möchten.
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Green, Richard Mutegeki. "q-Schur algebras and quantized enveloping algebras". Thesis, University of Warwick, 1995. http://wrap.warwick.ac.uk/71975/.
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The main aim of this thesis is to investigate the relationship between the quantized enveloping algebra U(gln) (corresponding to the Lie algebra gln) and the q-Schur algebra, Sq(n, r). It was shown in [BLM] that there is a surjective algebra homomorphism θr : (gln)→Z[v, v -1] ⓍSq(n,r), where q = v2. §1 is devoted to background material. In §2, we show explicitly how to embed the q-Schur algebra into the r-th tensor power of a suitable n x n matrix ring. This gives a product rule for the q-Schur algebra with similar properties to Schur's product rule for the unquantized Schur algebra. A corollary of this is that we can describe, in §2.3, a certain family of subalgebras of the q-Schur algebra. In §3, we use the product rule of §2 to prove a q-analogue of Woodcock's straightening formula for codeterminants. This gives a basis of "standard quantized codeterminants" for Sq(n, r) which is heavily used in chapters 4, 5 and 6. In §4, we use the theory of quantized codeterminants developed in §3 to describe preimages under the homomorphism Or and the kernel of Or. In §5, we use the results of §3 and §4 to link the representation theories of U(gln} and Sq(n, r). We also obtain a simplified proof of Dipper and James' "semistandard basis theorem" for q- Weyl modules of q-Schur algebras. In §6, we show how to make the set of q-Schur algebras Sq(n, r) (for a fixed n) into an inverse system. We prove that the resulting inverse limit, Sv(n), is a cellular algebra which is closely related to the quantized enveloping algebra U(sln) and Lusztig's algebra U.
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Schut, Christina [Verfasser]. "Stressbewältigungstraining bei Neurodermitis : Psychophysiologische Effekte / Christina Schut". Gießen : Universitätsbibliothek, 2013. http://d-nb.info/1065320280/34.
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Rogal, Stefan [Verfasser]. "Schul-Spuren : Möglichkeiten Biographischen Lernens / Stefan Rogal". Hamburg : Diplom.de, 2008. http://d-nb.info/111014931X/34.
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Syckor, Jens. "Dropbox & Co, alles schon ge-cloud?" Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-153998.
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Cloudspeicherdienste sind zu einem Standard für den Austausch großer Datenmengen in virtuellen Gemeinschaften geworden, sowohl im privaten Umfeld als auch im öffentlichen Bereich. Einfache Bedienbarkeit sowie nahtlose Integration in Applikationen, Betriebssystemen und Endgeräten sind wesentliche Bausteine dieses Siegeszuges.
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Wagner, David R. "Schur Rings Over Projective Special Linear Groups". BYU ScholarsArchive, 2016. https://scholarsarchive.byu.edu/etd/6089.
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This thesis presents an introduction to Schur rings (S-rings) and their various properties. Special attention is given to S-rings that are commutative. A number of original results are proved, including a complete classification of the central S-rings over the simple groups PSL(2,q), where q is any prime power. A discussion is made of the counting of symmetric S-rings over cyclic groups of prime power order. An appendix is included that gives all S-rings over the symmetric group over 4 elements with basic structural properties, along with code that can be used, for groups of comparatively small order, to enumerate all S-rings and compute character tables for those S-rings that are commutative. The appendix also includes code optimized for the enumeration of S-rings over cyclic groups.
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Fayers, Matthew. "Representations of symmetric groups and Schur algebras". Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620642.
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Maksimau, Ruslan. "Algèbres KLR et algèbres de carquois-Schur". Sorbonne Paris Cité, 2015. http://www.theses.fr/2015PA077160.
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Dans la première partie de la thèse on construit une base de la partie positive f de l'algèbre quantique de Drinfeld-Jimbo associée à un carquois de Dynkin. Cette base est donnée par des faisceaux de parité en caractéristique quelconque. De plus, on catégorifie la multiplication et la comultiplication dans f avec des complexes de faisceaux. Dans la deuxième partie il s'agit de la dualité de Koszul. Stroppel et Webster ont introduit une graduation sur la q-algèbre de Schur cyclotomique S. On démontre que l'algèbre graduée obtenue est Morita équivalente (au sens gradué) à une algèbre de Koszul. La preuve est basée sur le résultat de Rouquier, Shan, Varagnolo et Vasserot qui identifie la catégorie mod(S) avec une catégorie O affine parabolique de type A. Cette catégorie admet une graduation de Koszul construite par Shan, Varagnolo et Vasserot. On identifie cette graduation avec la graduation sur mod(S). Dans la troisième partie de la thèse on étudie une représentation catégorique dans la catégorie O parabolique pour la version affine de gl(N) de niveau -N-e. Cette catégorie admet une structure de représentation catégorique de sl(e) affine avec des foncteurs E et F. Che vma Cette catégorie contient une sous-catégorie plus petite A qui catégorifie l'espace de Fock de niveau supérieur. On démontre que le foncteur F pour la catégorie A de niveau -N-e se décompose en terme de composantes du foncteur F pour la catégorie A de niveau -N-e-1. Pour démontrer cela, on construit un isomorphisme entre l'algèbre KLR associée au carquois cyclique à e points et un sous-quotient de l'algèbre KLR associée au carquois cyclique à e+1 pointsIn the first part of the thesis we give a construction of a basis of the positive part f of the Drinfeld-Jimbo quantum enveloping algebra associated with a Dynkin quiver. This basis is given in terms of parity sheaves over fields in any characteristic. We also categorify both the multiplication and the comultiplication of f via complexes of sheaves. The second part deals with Koszul duality. Stroppel and Webster have introduced a grading on the cyclotomic q-Schur algebra S. We prove that the obtained graded algebra is graded Morita equivalent to a Koszul algebra. The proof is based on a result of Rouquier, Shan, Varagnolo and Vasserot that identifies the category mod(S) with a subcategory of an affine parabolic category O of type A. This subcategory admits a Koszul grading constructed by Shan, Varagnolo and Vasserot. We identify this Koszul grading with the grading on mod(S). In the third part of the thesis we study a categorical representation in the parabolic category O for affine gl(N) at level -N-e. This category admits a structure of a categorical representation of affine sl(e) with respect to some functors E and F. This category contains a smaller category A that caregorifies the higher level Fock space. We prove that the functor F for the category A at level -N-e can be decomposed in terms of the components of the functor F for the category A at level -N-e-1. To prove this, we construct an isomorphism between the KLR algebra associated with the cyclic quiver with e vertices and a subquotienl of the KLR algebra associated with the cyclic quiver with e+1 vertices
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Maja, Nedović. "The Schur complement and H-matrix theory". Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2016. https://www.cris.uns.ac.rs/record.jsf?recordId=101510&source=NDLTD&language=en.
Texto completoResumen
This thesis studies subclasses of the class of H-matrices and their applications, withemphasis on the investigation of the Schur complement properties. The contributionsof the thesis are new nonsingularity results, bounds for the maximum norm of theinverse matrix, closure properties of some matrix classes under taking Schurcomplements, as well as results on localization and separation of the eigenvalues ofthe Schur complement based on the entries of the original matrix.Докторска дисертација изучава поткласе класе Х-матрица и њихове примене,првенствено у истраживању својстава Шуровог комплемента. Оригиналан доприностезе представљају нови услови за регуларност матрица, оцене максимум нормеинверзне матрице, резултати о затворености појединих класа матрица на Шуровкомплемент, као и резултати о локализацији и сепарацији карактеристичнихкорена Шуровог комплемента на основу елемената полазне матрице.
Doktorska disertacija izučava potklase klase H-matrica i njihove primene,prvenstveno u istraživanju svojstava Šurovog komplementa. Originalan doprinosteze predstavljaju novi uslovi za regularnost matrica, ocene maksimum normeinverzne matrice, rezultati o zatvorenosti pojedinih klasa matrica na Šurovkomplement, kao i rezultati o lokalizaciji i separaciji karakterističnihkorena Šurovog komplementa na osnovu elemenata polazne matrice.
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Liese, Christin. "Kaufst du noch oder streamst du schon?" Bachelor's thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-223500.
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Die Zeiten der Plattensammlung sind vorbei, Kassetten und CDs sind der MP3-Datei gewichen und nun wird Musik ausschließlich gestreamt. Dieses Zukunftsszenario ist bis dato noch nicht eingetreten, aber wird dies überhaupt passieren? Wird der Kauf von physischen Musikdatenträgern und digitalen Musikdateien dank der immer stärker ansteigenden Streaming Aktivitäten komplett eingestellt? Oder können beide Formen nebeneinander existieren? Um diesen Fragen auf den Grund zu gehen, wurde im Rahmen dieser Arbeit eine Umfrage mit 1.661 Studenten der Technischen Universität Dresden durchgeführt. Die Ergebnisse geben Aufschluss über die Nutzungshäufigkeiten von kostenfreien und kostenpflichtigen Streaming Anbietern sowie von CDs / Schallplatten und MP3 Musikdateien. Zudem wird aufgezeigt, dass eine geringe Zahlungsbereitschaft bei den Studenten besteht. Es werden bereits selten mehr als 5 € in Musik investiert, doch seitdem die Studenten Streaming Dienste nutzen, geben sie nach eigenen Angaben noch weniger Geld für Musik aus als zuvor. Diesem Negativtrend steht die Erkenntnis gegenüber, dass die Probanden seit der Nutzung von Streaming Angeboten weniger Musik illegal herunterladen. Auch wenn der Großteil weniger Musik kauft, so ist es etwa der Hälfte aller Befragten sehr wichtig, Musik zu besitzen, vor allem in physischer Form. Zudem wurden Nutzungsmotive der Möglichkeiten des Musikhörens erfasst, um deren Stärken und Schwächen aufzuzeigen. Die Ergebnisse verdeutlichen, dass die kostenfreie Variante des Streamens zwar häufig genutzt wird, sich die traditionellen Musikdatenträger und Musikdateien jedoch immer noch großer Beliebtheit erfreuen. Von einer kompletten Verdrängung des Kaufens von Musik kann demnach nicht ausgegangen werden.
34
Tewari, Vasu. "Operators on compositions and noncommutative Schur functions". Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54290.
Texto completoResumen
In this thesis, we study a natural noncommutative lift of the ubiquitous Schur functions, called noncommutative Schur functions. These functions were introduced by Bessenrodt, Luoto and van Willigenburg and resemble Schur functions in many regards. We prove some new results for noncommutative Schur functions that are analogues of classical results, and demonstrate that the resulting combinatorics in this setting is equally rich. First we prove a Murnaghan-Nakayama rule for noncommutative Schur functions. In other words, we give an explicit combinatorial formula for expanding the product of a noncommutative power sum symmetric function and a noncommutative Schur function in terms of noncommutative Schur functions. In direct analogy to the classical Murnaghan-Nakayama rule, the summands are computed using a noncommutative analogue of border strips, and have coefficients ±1 determined by the height of these border strips. The rule is proved by interpreting the noncommutative Pieri rules for noncommutative Schur functions in terms of box adding operators on compositions. We proceed to give a backward jeu de taquin slide analogue on semistandard reverse composition tableaux. These tableaux were first studied by Haglund, Luoto, Mason and van Willigenburg when defining quasisymmetric Schur functions. Our algorithm for performing backward jeu de taquin slides on semistandard reverse composition tableaux results in a natural operator on compositions that we call the jdt operator. This operator in turn gives rise to a new poset structure on compositions whose maximal chains we enumerate. As an application, we also give new right Pieri rules for noncommutative Schur functions that use the jdt operators, in contrast to the left Pieri rules given by Bessenrodt, Luoto and van Willigenburg.Science, Faculty of
Mathematics, Department of
Graduate
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Drees, Leonard [Verfasser], Reinhard [Akademischer Betreuer] Schuh, Reinhard [Gutachter] Schuh y Jörg [Gutachter] Großhans. "Functional analysis of proteases in tracheal development of Drosophila / Leonard Drees ; Gutachter: Reinhard Schuh, Jörg Großhans ; Betreuer: Reinhard Schuh". Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2020. http://d-nb.info/1206415541/34.
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Luciano, JoÃo Henrique Silva. "ContribuiÃÃo ao Conhecimento QuÃmico de Plantas do Nordeste: Alibertia myrciifolia Spruce ex K. Schum. e Alibertia rigida K. Schum". Universidade Federal do CearÃ, 2009. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=4716.
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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgicoEste trabalho relata a investigaÃÃo quÃmica de duas espÃcies de plantas da famÃlia Rubiaceae, pertencentes ao gÃnero Alibertia: A. myrciifolia Spruce ex K. Schumman e A. rigida K. Schumman, ambas provenientes do municÃpio do Crato-CE (regiÃo da Chapada do Araripe). O estudo de A. myrciifolia resultou no isolamento e identificaÃÃo de 9 substÃncias. Do extrato hexÃnico dos talos obteve-se a mistura dos fitoesterÃides β-sitosterol e estigmasterol, alÃm dos triterpenos hidroxi-hopanona e 3α,22-diidroxi-hopano. Em acrÃscimo, foi preparado o triterpeno 3β,22-diidroxi-hopano por reduÃÃo da hidroxihopanona. A partir do extrato etanÃlico foram obtidos o flavonÃide 3,4-dimetoxi-luteolina, o triterpeno Ãcido ursÃlico, o fenil-propanÃide Ãcido cafeico e os iridÃides Ãcido geniposÃdico, Ãcido 10-O-vaniloil-geniposÃdico e o Ãcido 10-O-siringoil-geniposÃdico. Os triterpenos de esqueleto hopano sÃo inÃditos no gÃnero Alibertia, bem como o flavonÃide e os derivados do Ãcido geniposÃdico, sendo que o Ãcido 10-O-vaniloil-geniposÃdico possui carÃter inÃdito na literatura. Com relaÃÃo à prospecÃÃo quÃmica relativa Ãs folhas de A. rigida, foram isolados a partir do extrato etanÃlico os flavonÃides rutina, quercetina, canferol e 7-metÃxi-apigenina (genkwanina), um dÃmero do catecol (denominado de 3,4,3â,4â-tetra-hidroxibifenila), o Ãster etÃlico do Ãcido cafeico e a procianidina A-2. Todas as substÃncias sÃo inÃditas em Alibertia, com exceÃÃo da rutina. Em adiÃÃo ao estudo fitoquÃmico das duas espÃcies, foram realizados testes de atividade fungitÃxica e anti-leishmaniose com algumas das substÃncias isoladas. No teste contra fungos patogÃnicos, o Ãcido geniposÃdico, o Ãster etÃlico do Ãcido cafeico e a procianidina A-2 inibiram significativamente o crescimento das cepas testadas, enquanto os triterpenos de esqueleto hopano e o Ãcido 10-O-vaniloil-geniposÃdico foram inativos. Jà no teste contra Leishmania amazonensis, apenas o Ãster etÃlico do Ãcido cafeico foi ativo. Os metabÃlitos secundÃrios isolados foram caracterizados atravÃs do uso de mÃtodos espectroscÃpicos na regiÃo do I.V., espectros de massa e de RMN 1H e 13C, incluindo tÃcnicas uni e bidimensionais (HMBC e HMQC), alÃm de comparaÃÃo com dados descritos na literatura.
This work reports the chemical investigation of two plants of the Rubiaceae family, belonging to the Alibertia genus: A. myrciifolia Spruce ex K. Schumman and A. rigida K. Schumman, both collected in Crato County â CE (Araripeâs Plateau). The chemical study of A. myrciifolia resulted on the isolation and characterization of nine compounds. From the hexane extract of the aerial parts was obtained β-sitosterol and stigmasterol as mixture, besides the triterpenes hydroxyhopanone and 3α,22-dihydroxyhopane. In addition, the triterpene 3β,22-dihydroxyhopane was prepared by reduction of hydroxyhopanone. From the ethanolic extract it was obtained the flavonoid 3,4-dimethoxyluteolin, the triterpene ursolic acid, the phenylpropanoid caffeic acid and the iridoids geniposidic acid, 10-O-vanilloylgeniposidic acid and 10-O-syringoyl-geniposidic acid. The hopane triterpenes are new on Alibertia genus, as well as the flavonoid and the geniposidic acid derivatives. The 10-Ovanilloyl- geniposidic acid is a new compound. Regarding the chemical analysis of the leaves from A. rigida, the flavonoids rutin, quercetin, kaempferol and the 7-methoxyapigenin (genkwanin), a catechol dimer (3,4,3â,4â- etrahydroxybiphenyl), the caffeic acid ethyl ester and the procyanidin A-2 were obtained. All compounds are new on Alibertia genus, with exception of rutin. In addition to the phytochemical study of both species, some isolated compounds were submitted to fungitoxic and antileishmanial assays. The test against pathogenic fungi showed significant inhibition on the growth of tested strains by geniposidic acid, caffeic acid ethyl ester and procyanidin A-2, while the hopane triterpenes and the 10-Ovanilloyl- geniposidic acid were inactive. In the test against Leishmania amazonensis, only caffeic acid ethyl ester showed activity. Secondary metabolites of A. myrciifolia were characterized by spectroscopic methods including IR, NMR 1H and NMR 13C, uni and bidimensional, and comparison with literature data.
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Luciano, João Henrique Silva. "Contribuição ao Conhecimento Químico de Plantas do Nordeste: Alibertia myrciifolia Spruce ex K. Schum. e Alibertia rigida K. Schum". LUCIANO, J. H. S.; LIMA, M. A. S. (2009), 2009. http://www.repositorio.ufc.br/handle/riufc/15848.
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LUCIANO, J. H. S. Contribuição ao Conhecimento Químico de Plantas do Nordeste: Alibertia myrciifolia Spruce ex K. Schum. e Alibertia rigida K. Schum. 2009. 233 f. Tese (Doutorado em Química) - Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2009.Submitted by Daniel Eduardo Alencar da Silva (dealencar.silva@gmail.com) on 2014-11-17T17:46:16Z No. of bitstreams: 1 2009_tese_jhsluciano.pdf: 13388507 bytes, checksum: 9dfb89231720b828ece2984124849b69 (MD5)
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This work reports the chemical investigation of two plants of the Rubiaceae family, belonging to the Alibertia genus: A. myrciifolia Spruce ex K. Schumman and A. rigida K. Schumman, both collected in Crato County – CE (Araripe’s Plateau). The chemical study of A. myrciifolia resulted on the isolation and characterization of nine compounds. From the hexane extract of the aerial parts was obtained β-sitosterol and stigmasterol as mixture, besides the triterpenes hydroxyhopanone and 3α,22-dihydroxyhopane. In addition, the triterpene 3β,22-dihydroxyhopane was prepared by reduction of hydroxyhopanone. From the ethanolic extract it was obtained the flavonoid 3,4-dimethoxyluteolin, the triterpene ursolic acid, the phenylpropanoid caffeic acid and the iridoids geniposidic acid, 10-O-vanilloylgeniposidic acid and 10-O-syringoyl-geniposidic acid. The hopane triterpenes are new on Alibertia genus, as well as the flavonoid and the geniposidic acid derivatives. The 10-Ovanilloyl- geniposidic acid is a new compound. Regarding the chemical analysis of the leaves from A. rigida, the flavonoids rutin, quercetin, kaempferol and the 7-methoxyapigenin (genkwanin), a catechol dimer (3,4,3’,4’- etrahydroxybiphenyl), the caffeic acid ethyl ester and the procyanidin A-2 were obtained. All compounds are new on Alibertia genus, with exception of rutin. In addition to the phytochemical study of both species, some isolated compounds were submitted to fungitoxic and antileishmanial assays. The test against pathogenic fungi showed significant inhibition on the growth of tested strains by geniposidic acid, caffeic acid ethyl ester and procyanidin A-2, while the hopane triterpenes and the 10-Ovanilloyl- geniposidic acid were inactive. In the test against Leishmania amazonensis, only caffeic acid ethyl ester showed activity. Secondary metabolites of A. myrciifolia were characterized by spectroscopic methods including IR, NMR 1H and NMR 13C, uni and bidimensional, and comparison with literature data.
Este trabalho relata a investigação química de duas espécies de plantas da família Rubiaceae, pertencentes ao gênero Alibertia: A. myrciifolia Spruce ex K. Schumman e A. rigida K. Schumman, ambas provenientes do município do Crato-CE (região da Chapada do Araripe). O estudo de A. myrciifolia resultou no isolamento e identificação de 9 substâncias. Do extrato hexânico dos talos obteve-se a mistura dos fitoesteróides β-sitosterol e estigmasterol, além dos triterpenos hidroxi-hopanona e 3α,22-diidroxi-hopano. Em acréscimo, foi preparado o triterpeno 3β,22-diidroxi-hopano por redução da hidroxihopanona. A partir do extrato etanólico foram obtidos o flavonóide 3,4-dimetoxi-luteolina, o triterpeno ácido ursólico, o fenil-propanóide ácido cafeico e os iridóides ácido geniposídico, ácido 10-O-vaniloil-geniposídico e o ácido 10-O-siringoil-geniposídico. Os triterpenos de esqueleto hopano são inéditos no gênero Alibertia, bem como o flavonóide e os derivados do ácido geniposídico, sendo que o ácido 10-O-vaniloil-geniposídico possui caráter inédito na literatura. Com relação à prospecção química relativa às folhas de A. rigida, foram isolados a partir do extrato etanólico os flavonóides rutina, quercetina, canferol e 7-metóxi-apigenina (genkwanina), um dímero do catecol (denominado de 3,4,3’,4’-tetra-hidroxibifenila), o éster etílico do ácido cafeico e a procianidina A-2. Todas as substâncias são inéditas em Alibertia, com exceção da rutina. Em adição ao estudo fitoquímico das duas espécies, foram realizados testes de atividade fungitóxica e anti-leishmaniose com algumas das substâncias isoladas. No teste contra fungos patogênicos, o ácido geniposídico, o éster etílico do ácido cafeico e a procianidina A-2 inibiram significativamente o crescimento das cepas testadas, enquanto os triterpenos de esqueleto hopano e o ácido 10-O-vaniloil-geniposídico foram inativos. Já no teste contra Leishmania amazonensis, apenas o éster etílico do ácido cafeico foi ativo. Os metabólitos secundários isolados foram caracterizados através do uso de métodos espectroscópicos na região do I.V., espectros de massa e de RMN 1H e 13C, incluindo técnicas uni e bidimensionais (HMBC e HMQC), além de comparação com dados descritos na literatura.
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Erpenbeck, Luise [Verfasser], Michael P. [Akademischer Betreuer] Schön, Matthias [Akademischer Betreuer] Dobbelstein y Thomas [Akademischer Betreuer] Crozier. "Platelet surface receptors and melanoma metastasis / Luise Erpenbeck. Gutachter: Michael P. Schön ; Matthias Dobbelstein ; Thomas Crozier. Betreuer: Michael P. Schön". Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2011. http://d-nb.info/1042348847/34.
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Morin, Ma. "Schur-positivity of differences of augmented staircase diagrams". Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/25747.
Texto completoResumen
The Schur functions {s_lambda} and ubiquitous Littlewood-Richardson coefficients are instrumental in describing representation theory, symmetric functions,and even certain areas of algebraic geometry. Determining when two skew
diagrams D₁, D₂ have the same skew Schur function or determining when the difference of two such skew Schur functions SD₁ - SD₂ is Schur-positive
reveals information about the structures corresponding to these functions.
By defining a set of staircase diagrams that we can augment with other (skew) diagrams, we discover collections of skew diagrams for which the question of Schur-positivity among each difference can be resolved. Furthermore, for certain Schur-positive differences we give explicit formulas for computing the coefficients of the Schur functions in the difference.
We extend from simple staircases to fat staircases, and carry on to diagrams called sums of fat staircases. These sums of fat staircases can also be augmented with other (skew) diagrams to obtain many instances of Schur positivity.
We note that several of our Schur-positive differences become equalities of skew Schur functions when the number of variables is reduced. Finally, we give a factoring identity which allows one to obtain many of the non-trivial finite-variable equalities of skew Schur functions.
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Sundqvist, Alexander y Fredrik Johansson. "Produktivitetsmätning : En fallstudie på Schunk Nordiska i Lenhovda". Thesis, Linnéuniversitetet, Institutionen för ekonomistyrning och logistik (ELO), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-27358.
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Bakgrund: En viktig del i företagens jakt efter att nå lönsamhet tenderar att vara mätning och förändring av produktiviteten. Om företag lyckats med uppdraget att höja produktiviteten i verksamheten, allt annat lika, kommer detta sammanfalla med att lönsamheten förändras positivt. Det är därför produktivitetsmätning i praktiken är viktigt. Syfte: Syftet med denna studie är att vidareutveckla produktivitetsmätningarna i författarnas fallföretag. Vidare ämnar studien finna svar på vilka faktorer som påverkar Schunks produktivitet och hur dessa kan påverkas samt hur de kan gå till väga för att använda dessa mätningar som underlag för ökad lönsamhet. Metod: Författarna har valt att utföra en kvalitativ fallstudie på företaget Schunk. Det empiriska materialet som samlats in via semistrukturerade intervjuer har sedan jämförts med det teoretiska ramverket. Slutsats: Resultatet presenter Schunks produktivitetspotential och de faktorer som föreligger. Författarna presenterar även ett ytterligare mått för ökad mätning och kopplar produktiviteten till lönsamheten i ett Du Pont-schema. Vidare lyfts slutsatserna ur kontext och en föreslagen arbetsgång presenteras.
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Turner, David P. "Coefficient space properties and a Schur algebra generalization". Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Fall/Dissertation/TURNER_DAVID_51.pdf.
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邵慰慈 y Wai-chee Shiu. "Schur rings over dihedral groups of order 2p". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1989. http://hub.hku.hk/bib/B31208873.
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邵慰慈 y Wai-chee Shiu. "The algebraic structure and computation of Schur rings". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1992. http://hub.hku.hk/bib/B31233181.
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Schön, Thomas [Verfasser] y Christian [Akademischer Betreuer] Koziol. "Analyse von Ausfallrisiken / Thomas Schön ; Betreuer: Christian Koziol". Tübingen : Universitätsbibliothek Tübingen, 2016. http://d-nb.info/1163665096/34.
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Shiu, Wai-chee. "The algebraic structure and computation of Schur rings /". [Hong Kong : University of Hong Kong], 1992. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1329037X.
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Shiu, Wai-chee. "Schur rings over dihedral groups of order 2p /". [Hong Kong : University of Hong Kong], 1989. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12364770.
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Pylyavskyy, Pavlo. "Comparing products of Schur functions and quasisymmetric functions". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/38957.
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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 2007.Includes bibliographical references (p. 71-74).
In this thesis a conjecture of Okounkov, a conjecture of Fomin-Fulton-Li-Poon, and a special case of Lascoux-Leclerc-Thibon's conjecture on Schur positivity of certain differences of products of Schur functions are proved. In the first part of the work a combinatorial method is developed that allows to prove weaker versions of those conjectures. In the second part a recent result of Rhoades and Skandera is used to provide a proof of actual Schur positivity results. Several further generalizations are stated and proved. In particular, an intriguing log-concavity property of Schur functions is observed. In addition, a stronger conjecture is stated in language of alcoved polytops. A weaker version of this conjecture is proved using a characterization of Klyachko cone and the theory of Temperley-Lieb immanants.
by Pavlo Pylyavskyy.
Ph.D.
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Jasper, John 1981. "Infinite dimensional versions of the Schur-Horn theorem". Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/11575.
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ix, 99 p.We characterize the diagonals of four classes of self-adjoint operators on infinite dimensional Hilbert spaces. These results are motivated by the classical Schur-Horn theorem, which characterizes the diagonals of self-adjoint matrices on finite dimensional Hilbert spaces. In Chapters II and III we present some known results. First, we generalize the Schur-Horn theorem to finite rank operators. Next, we state Kadison's theorem, which gives a simple necessary and sufficient condition for a sequence to be the diagonal of a projection. We present a new constructive proof of the sufficiency direction of Kadison's theorem, which is referred to as the Carpenter's Theorem. Our first original Schur-Horn type theorem is presented in Chapter IV. We look at operators with three points in the spectrum and obtain a characterization of the diagonals analogous to Kadison's result. In the final two chapters we investigate a Schur-Horn type problem motivated by a problem in frame theory. In Chapter V we look at the connection between frames and diagonals of locally invertible operators. Finally, in Chapter VI we give a characterization of the diagonals of locally invertible operators, which in turn gives a characterization of the sequences which arise as the norms of frames with specified frame bounds. This dissertation includes previously published co-authored material.
Committee in charge: Marcin Bownik, Chair; N. Christopher Phillips, Member; Yuan Xu, Member; David Levin, Member; Dietrich Belitz, Outside Member
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Branco, Natália Bruzamarello Caon. "Mucilagem do cladódio de cereus hildmaniannus K. Schum". Florianópolis, 2011. http://repositorio.ufsc.br/xmlui/handle/123456789/95671.
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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia QuímicaMade available in DSpace on 2012-10-26T04:43:45Z (GMT). No. of bitstreams: 1 303780.pdf: 1145249 bytes, checksum: 342df169017dc3c0dfce1f6e609eb2dc (MD5)
Fontes naturais sustentáveis de biomassa que existem em muitas regiões do mundo podem ser utilizadas como alternativas mais baratas para produção de gomas polissacarídicas de valor agregado industrial. Entre estas fontes que estão atualmente sendo procuradas para este propósito, plantas dos países com regiões áridas merecem atenção especial pela suas vantagens econômicas e ecológicas, como o baixo consumo de água e energia necessária para a exploração comercial. Nesse contexto, a cactácea Cereus hildmaniannus K. Schum vegeta naturalmente em solos pedregosos e com escassez de água. É uma espécie muito conhecida pela população rural do meio-oeste do Estado de Santa Catarina e tem se mostrado importante, pois apresenta potencial de domesticação e cultivo em escala. Esta cactácea apresenta-se, entre outras aplicações tecnológicas, como fonte do carboidrato complexo mucilagem. Esta possui elevada capacidade de absorver água e pode ser considerada como potencial hidrocolóide industrial, tanto na área alimentícia quanto em outras áreas. Nesse sentido, o presente trabalho visa contribuir para caracterizar este cacto quanto às suas potencialidades tecnológicas associadas à mucilagem presente em seu cladódio. Metodologia de extração aquosa e precipitação com etanol foi proposta, a qual se mostrou adequada para a obtenção do produto sólido. Foram realizadas análises de infravermelho, termogravimetria, calorimetria exploratória diferencial, difração de raios X e microscopia eletrônica de varredura para caracterização da mucilagem em pó. O comportamento da mucilagem em solução aquosa foi avaliado pelas medidas do pH no ponto de carga zero e solubilidade. O comportamento reológico foi elucidado utilizando ensaios reológicos unidirecionais em um viscosímetro de cilindros concêntricos e a viscosidade intrínseca do biopolímero foi medida utilizando um viscosímetro de Cannon-Fenske. Os resultados indicaram que a mucilagem é estável até aproximadamente 200 °C e apresenta estrutura parcialmente cristalina. O modelo reológico que melhor ajustou os dados foi o modelo de Herschel-Bulkley para todas as concentrações avaliadas, exceto para a amostra a 0,10%, que foi mais bem ajustada pelo modelo de Bingham. Desta forma, a mucilagem de Cereus hildmaniannus K. Schum possui comportamento não-newtoniano e é dependente do tempo (tixotrópico) em temperaturas na faixa de 10 °C a 25 °C.
Sustainable natural resources of biomass that exist in many regions of the world may be used as less expensive alternatives for producing add-ed-value industrial polysaccharide gums. Among resources currently being sought for this purpose, indigenous plants from arid lands deserve special attention due to their economic and ecological advantages, such as the low input of water and energy needed for their commercial ex-ploitation. In this context, the cactus Cereus hildmaniannus K. Schum naturally grows in stony soil with lack of water. The specie is well-known by the rural population of the Midwest region of Santa Catarina State and has been important, as it presents potential for domestication and scale cultivation. This cactus presents, among several technological applications, as source of the complex carbohydrate mucilage. Mucilage has high capacity to absorb water and could be considered as a potential hydrocolloid for industrial use, such in food industry as in other areas. In this sense, this work aims to contribute to characterize this cactus in terms of its technological potential of the mucilage present in the cla-dodes. A methodology for aqueous extraction and precipitation with ethanol was proposed, which was adequate for obtaining the solid prod-uct. Fourier transform infrared, thermogravimetry, differential scanning calorimetry, X-ray diffraction, and scanning electron microscopy were employed to characterize the mucilage. The behavior of the mucilage in aqueous solution was evaluated by measuring the solubility and the pH at the point of zero charge. The rheological behavior was elucidated using unidirectional rheology in a concentric cylinders viscometer and the intrinsic viscosity of the biopolymer was measured using Cannon-Fenske glass viscometer. The results indicated that mucilage is stable until temperatures near 200 °C and has a partially crystalline structure. Herschel-Bulkley model successfully correlated data for all evaluated concentrations, except for the sample at 0.10%, which was adjusted using Bingham model. Thus, mucilage from Cereus hildmaniannus K. Schum has a non-newtonian behavior and is time-dependent (thixotrop-ic) in temperatures from 10 °C to 25 °C.
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Daoudi, El Idrissi Amina. ""Phyllanthus amarus" Schum. Et Thonn. "Phyllanthus niruri" L". Paris 5, 1995. http://www.theses.fr/1995PA05P200.
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