subject:(Approximation properties)

Ryerson University

1. Ellaban, Eglal. Instability of a binary liquid film flowing down a slippery inclined heated plate.

Degree: 2016, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A5691

► In this thesis we studied the stability of a binary liquid film flowing down a heated porous inclined plate. It is assumed that the heating… (more)

Subjects/Keywords: Fluid dynamics – Mathematical models.; Navier-Stokes equations.; Porous materials – Thermal properties – Mathematical models.; Chebyshev approximation.

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APA (6^th Edition):

Ellaban, E. (2016). Instability of a binary liquid film flowing down a slippery inclined heated plate. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A5691

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ellaban, Eglal. “Instability of a binary liquid film flowing down a slippery inclined heated plate.” 2016. Thesis, Ryerson University. Accessed February 27, 2021. https://digital.library.ryerson.ca/islandora/object/RULA%3A5691.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ellaban, Eglal. “Instability of a binary liquid film flowing down a slippery inclined heated plate.” 2016. Web. 27 Feb 2021.

Vancouver:

Ellaban E. Instability of a binary liquid film flowing down a slippery inclined heated plate. [Internet] [Thesis]. Ryerson University; 2016. [cited 2021 Feb 27]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A5691.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ellaban E. Instability of a binary liquid film flowing down a slippery inclined heated plate. [Thesis]. Ryerson University; 2016. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A5691

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Brito, Leonardo da Silva. Versões das propriedades A e B de Lindenstrauss para operadores compactos.

Degree: 2018, Universidade Federal do Amazonas

URL: https://tede.ufam.edu.br/handle/tede/6386

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O objetivo desta dissertação é estudar as versões das propriedades A e B de Lindenstrauss para operadores compactos. No decorrer do nosso trabalho, apresentamos resultados… (more)

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O objetivo desta dissertação é estudar as versões das propriedades A e B de Lindenstrauss para operadores compactos. No decorrer do nosso trabalho, apresentamos resultados sobre a topologia fraca-estrela, bases de Schauder, propriedades da aproximação, espaços de Banach cuja norma depende localmente de finitas coordenados, espaço estritamente convexo, espaço uniformemente convexo, dentre outros. Em 2014 Miguel Martín publicou um artigo respondendo de maneira positiva a seguinte pergunta: Existem operadores compactos entre espaços de Banach que não podem ser aproximados por operadores compactos que atingem a norma? Ao fazer isso, introduziu, no mesmo trabalho, duas propriedades chamadas de propriedades Ak e Bk ou versões para operadores compactos das propriedades de Lindenstrauss. Nesta dissertação, são apresentados de maneira detalhada resultados relacionados às propriedades A e B de Lindenstrauss e propriedades Ak e Bk.

The main goal in this dissertation is to study the versions for compact operators of Lindenstrauss property A and B. In the course of our work, we present results concerning weak-star topology, Schauder basis, approximation properties, Banach spaces that locally depend upon finitely many coordinates, strictly convex spaces, uniformly convex spaces, among others. In 2014 Miguel Martín answered positively the following question: Are there compact operators between Banach spaces that can not be approximated by compact operators that attain their norms? In order to do that, he introduced two properties called properties Ak and Bk or versions for compact operators of Lindenstrauss properties. In this dissertation we present some results regarding Lindenstrauss properties A and B, and we also provide several results regarding properties Ak and Bk.

CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico

Advisors/Committee Members: Alves, Thiago Rodrigo, 98547607153, http://lattes.cnpq.br/4049150059686360, Alves, Thiago Rodrigo, Botelho, Geraldo Márcio de Azevedo, Jacinto, Flávia Morgana de Oliveira, [email protected].

Subjects/Keywords: Operador compacto; Propriedades de Lindenstrauss; Propriedade da aproximação; Espaços uniformemente convexos; Compact operator; Lindenstrauss properties; Approximation properties; Uniformly convex space; CIÊNCIAS EXATAS E DA TERRA: MATEMÁTICA

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APA (6^th Edition):

Brito, L. d. S. (2018). Versões das propriedades A e B de Lindenstrauss para operadores compactos. (Masters Thesis). Universidade Federal do Amazonas. Retrieved from https://tede.ufam.edu.br/handle/tede/6386

Chicago Manual of Style (16^th Edition):

Brito, Leonardo da Silva. “Versões das propriedades A e B de Lindenstrauss para operadores compactos.” 2018. Masters Thesis, Universidade Federal do Amazonas. Accessed February 27, 2021. https://tede.ufam.edu.br/handle/tede/6386.

MLA Handbook (7^th Edition):

Brito, Leonardo da Silva. “Versões das propriedades A e B de Lindenstrauss para operadores compactos.” 2018. Web. 27 Feb 2021.

Vancouver:

Brito LdS. Versões das propriedades A e B de Lindenstrauss para operadores compactos. [Internet] [Masters thesis]. Universidade Federal do Amazonas; 2018. [cited 2021 Feb 27]. Available from: https://tede.ufam.edu.br/handle/tede/6386.

Council of Science Editors:

Brito LdS. Versões das propriedades A e B de Lindenstrauss para operadores compactos. [Masters Thesis]. Universidade Federal do Amazonas; 2018. Available from: https://tede.ufam.edu.br/handle/tede/6386

3. Salamone, Salvatore. Propriétés physiques des empilements de fibres macroscopiques : une approche expérimentale, théorique et numérique : Physical properties of macroscopic fiber bundles : an experimental, theoretical and numerical approach.

Degree: Docteur es, Physique, 2018, Université de Strasbourg

URL: http://www.theses.fr/2018STRAE007

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L'objectif de ce travail est de comprendre comment la forme intrinsèque des fibres individuelles contrôle les propriétés collectives des empilements, en particulier leurs propriétés mécaniques… (more)

Subjects/Keywords: Fibre; Empilement de fibres; Physique statistique; Approximation de champ moyen; Désordre de forme; Propriétés mécaniques des matériaux; Propriétés électriques; Fiber; Bundle/stack of fibers; Statistical physics; Mean field approximation; Shape disorder; Mechanical properties of materials; Electrical properties; 620.11

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Salamone, S. (2018). Propriétés physiques des empilements de fibres macroscopiques : une approche expérimentale, théorique et numérique : Physical properties of macroscopic fiber bundles : an experimental, theoretical and numerical approach. (Doctoral Dissertation). Université de Strasbourg. Retrieved from http://www.theses.fr/2018STRAE007

Chicago Manual of Style (16^th Edition):

Salamone, Salvatore. “Propriétés physiques des empilements de fibres macroscopiques : une approche expérimentale, théorique et numérique : Physical properties of macroscopic fiber bundles : an experimental, theoretical and numerical approach.” 2018. Doctoral Dissertation, Université de Strasbourg. Accessed February 27, 2021. http://www.theses.fr/2018STRAE007.

MLA Handbook (7^th Edition):

Salamone, Salvatore. “Propriétés physiques des empilements de fibres macroscopiques : une approche expérimentale, théorique et numérique : Physical properties of macroscopic fiber bundles : an experimental, theoretical and numerical approach.” 2018. Web. 27 Feb 2021.

Vancouver:

Salamone S. Propriétés physiques des empilements de fibres macroscopiques : une approche expérimentale, théorique et numérique : Physical properties of macroscopic fiber bundles : an experimental, theoretical and numerical approach. [Internet] [Doctoral dissertation]. Université de Strasbourg; 2018. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2018STRAE007.

Council of Science Editors:

Salamone S. Propriétés physiques des empilements de fibres macroscopiques : une approche expérimentale, théorique et numérique : Physical properties of macroscopic fiber bundles : an experimental, theoretical and numerical approach. [Doctoral Dissertation]. Université de Strasbourg; 2018. Available from: http://www.theses.fr/2018STRAE007

4. Vergara Soto, Ignacio. Multipliers and approximation properties of groups : Multiplicateurs et propriétés d'approximation de groupes.

Degree: Docteur es, Mathématiques, 2018, Lyon

URL: http://www.theses.fr/2018LYSEN042

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Cette thèse porte sur des propriétés d'approximation généralisant la moyennabilité pour les groupes localement compacts. Ces propriétés sont définies à partir des multiplicateurs de certaines… (more)

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Cette thèse porte sur des propriétés d'approximation généralisant la moyennabilité pour les groupes localement compacts. Ces propriétés sont définies à partir des multiplicateurs de certaines algèbres associés aux groupes. La première partie est consacrée à l'étude de la propriété p-AP, qui est une extension de la AP de Haagerup et Kraus au cadre des opérateurs sur les espaces Lp. Le résultat principal dit que les groupes de Lie simples de rang supérieur et de centre fini ne satisfont p-AP pour aucun p entre 1 et l'infini. La deuxième partie se concentre sur les multiplicateurs de Schur radiaux sur les graphes. L'étude de ces objets est motivée par les liens avec les actions de groupes discrets et la moyennabilité faible. Les trois résultats principaux donnent des conditions nécessaires et suffisantes pour qu'une fonction sur les nombres naturels définisse un multiplicateur radial sur des différentes classes de graphes généralisant les arbres. Plus précisément, les classes de graphes étudiées sont les produits d'arbres, les produits de graphes hyperboliques et les complexes cubiques CAT(0) de dimension finie.

This thesis focusses on some approximation properties which generalise amenability for locally compact groups. These properties are defined by means of multipliers of certain algebras associated to the groups. The first part is devoted to the study of the p-AP, which is an extension of the AP of Haagerup and Kraus to the context of operators on Lp spaces. The main result asserts that simple Lie groups of higher rank and finite centre do not satisfy p-AP for any p between 1 and infinity. The second part concentrates on radial Schur multipliers on graphs. The study of these objects is motivated by some connections with actions of discrete groups and weak amenability. The three main results give necessary and sufficient conditions for a function of the natural numbers to define a radial multiplier on different classes of graphs generalising trees. More precisely, the classes of graphs considered here are products of trees, products hyperbolic graphs and finite dimensional CAT(0) cube complexes.

Advisors/Committee Members: De La Salle, Mikael (thesis director), Xu, Quanhua (thesis director).

Subjects/Keywords: Groupes localement compacts; Applications complètement bornées; Propriétés d'approximation de groupes; Multiplicateurs; Graphes infinis; Locally compact groups; Completely bounded maps; Approximation properties of groups; Multipliers; Infinite graphs

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Vergara Soto, I. (2018). Multipliers and approximation properties of groups : Multiplicateurs et propriétés d'approximation de groupes. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2018LYSEN042

Chicago Manual of Style (16^th Edition):

Vergara Soto, Ignacio. “Multipliers and approximation properties of groups : Multiplicateurs et propriétés d'approximation de groupes.” 2018. Doctoral Dissertation, Lyon. Accessed February 27, 2021. http://www.theses.fr/2018LYSEN042.

MLA Handbook (7^th Edition):

Vergara Soto, Ignacio. “Multipliers and approximation properties of groups : Multiplicateurs et propriétés d'approximation de groupes.” 2018. Web. 27 Feb 2021.

Vancouver:

Vergara Soto I. Multipliers and approximation properties of groups : Multiplicateurs et propriétés d'approximation de groupes. [Internet] [Doctoral dissertation]. Lyon; 2018. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2018LYSEN042.

Council of Science Editors:

Vergara Soto I. Multipliers and approximation properties of groups : Multiplicateurs et propriétés d'approximation de groupes. [Doctoral Dissertation]. Lyon; 2018. Available from: http://www.theses.fr/2018LYSEN042

5. Dalet, Aude. Etude des Espaces Lipschitz-libres : Study of Lipschitz-free spaces.

Degree: Docteur es, Mathématiques, 2015, Besançon

URL: http://www.theses.fr/2015BESA2050

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Godefroy et Ozawa ont montré qu’il existe un espace compact dont l’espace libre n’a pas la propriété d’approximation. Il est donc naturel de se demander… (more)

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Godefroy et Ozawa ont montré qu’il existe un espace compact dont l’espace libre n’a pas la propriété d’approximation. Il est donc naturel de se demander quels sont les espaces métriques dont l’espace libre à la propriété d’approximation bornée. Grothendieck a montré qu’un dual séparable ayant la propriété d’approximation a la propriété d’approximation métrique. Ce résultat justifie l’utilité de savoir si un espace libre est un dual. Le premier chapitre est consacré à la dualité. Pour commencer nous présentons un théorème permettant de montrer qu’un espace de Banach séparable est le dual d’un sous-espace de son dual, sous conditions. Nous expliquons ensuite comment appliquer ce théorème dans le cadre des espaces libres. Dans la suite du chapitre nous l’appliquons aux espaces propres dénombrables ou ultramétriques. Dans le deuxième chapitre nous nous intéressons à la propriété d’approximation métrique sur l’espace libre des espaces propres dénombrables. Nous énonçons tout d’abord un résultat dû à Kalton puis nous l’utilisons pour montrer que sous ces hypothèses, l’espace libre a la propriété d’approximation métrique. Le troisième chapitre est dédié à l’étude des espaces libres sur les espaces ultramétriques. Nous montrons dans un premier temps que lorsque l’espace ultramétrique est propre, son espace libre a la propriété d’approximation métrique et est isomorphe à l1, de plus il admet un prédualisomorphe à c0. Enfin, en collaboration avec P. Kaufmann et A. Prochàzka, nous montrons que l’espace libre sur un espace ultramétrique n’est jamais isométrique à un espace l1 et nous généralisons ce résultat à certains sous-ensembles des arbres réels séparables.

Godefroy and Ozawa have proved that there exists a compact space with a free space failing the approximation property. Then it is natural to ask what are the metric spaces whose freespace has the bounded approximation property. Grothendieck has proved that a separable Banach space with the approximation property has the metric approximation property. This result justifies why it is interesting to know whether a free space is a dual space. The first chapter is dedicated to duality. First we introduce a result to prove that a Banach space is a dual space, under some conditions. Then we explain how to use it in the context offree spaces and finally we apply it to countable or ultrametric proper metric spaces.In the second chapter, we study the metric approximation property of free spaces overcountable proper metric spaces.In the third chapter, ultrametric spaces are investigated. We prove first that the free spaceover a proper ultrametric space has the metric approximation property, is isomorphic to l1 andadmits a predual isomorphic to c0. Finally, in collaboration with P. Kaufmann et A. Proch`azka,we prove that the free space over a ultrametric space is never isometric to l1 and we generalizethis result to some subsets of separable R-trees.

Advisors/Committee Members: Lancien, Gilles (thesis director).

Subjects/Keywords: Espace Lipschitz-libre; Dualité; Propriété d'approximation; Espace ultramétrique; Espace compact dénombrable; Lispchitz-free space; Duality; Approximation properties; Ultrametric space; Xountable compact space; 510; 46B80; 46B28; 46B10; 46B03

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dalet, A. (2015). Etude des Espaces Lipschitz-libres : Study of Lipschitz-free spaces. (Doctoral Dissertation). Besançon. Retrieved from http://www.theses.fr/2015BESA2050

Chicago Manual of Style (16^th Edition):

Dalet, Aude. “Etude des Espaces Lipschitz-libres : Study of Lipschitz-free spaces.” 2015. Doctoral Dissertation, Besançon. Accessed February 27, 2021. http://www.theses.fr/2015BESA2050.

MLA Handbook (7^th Edition):

Dalet, Aude. “Etude des Espaces Lipschitz-libres : Study of Lipschitz-free spaces.” 2015. Web. 27 Feb 2021.

Vancouver:

Dalet A. Etude des Espaces Lipschitz-libres : Study of Lipschitz-free spaces. [Internet] [Doctoral dissertation]. Besançon; 2015. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2015BESA2050.

Council of Science Editors:

Dalet A. Etude des Espaces Lipschitz-libres : Study of Lipschitz-free spaces. [Doctoral Dissertation]. Besançon; 2015. Available from: http://www.theses.fr/2015BESA2050

6. Brannan, Michael Paul. On the Reduced Operator Algebras of Free Quantum Groups .

Degree: Mathematics and Statistics, 2012, Queens University

URL: http://hdl.handle.net/1974/7342

► In this thesis, we study the operator algebraic structure of various classes of unimodular free quantum groups, including thefree orthogonal quantum groups O_n⁺, free unitary… (more)

▼ In this thesis, we study the operator algebraic structure of various classes of unimodular free quantum groups, including thefree orthogonal quantum groups O_n⁺, free unitary quantum groups U_n⁺, and trace-preserving quantum automorphism groups associated to finite dimensional C^\ast-algebras. The first objective of this thesis to establish certain approximation properties for the reduced operator algebras associated to the quantum groups \G = O_n⁺ and U_n⁺, (n ≥ 2). Here we prove that the reduced von Neumann algebras L^∞(\G) have the Haagerup approximation property, the reduced C^\ast-algebras C_r(\G) have Grothendieck's metric approximation property, and that the quantum convolution algebras L¹(\G) admit multiplier-bounded approximate identities. We then go on to study trace-preserving quantum automorphism groups \G of finite dimensional C^\ast-algebras (B, ψ), where ψ is the canonical trace on B induced by the regular representation of B. Here, we extend several known results for free orthogonal and free unitary quantum groups to the setting of quantum automorphism groups. We prove that the discrete dual quantum groups \hG have the property of rapid decay, the von Neumann algebras L^∞(\G) have the Haagerup approximation property, and that L^∞(\G) is (in most cases) a full type II₁-factor. As applications of these and other results, we deduce the metric approximation property, exactness, simplicity and uniqueness of trace for the reduced C^\ast-algebras C_r(\G), and the existence of multiplier-bounded approximate identities for the convolution algebras L¹(\G). We also show that when B is a full matrix algebra, L^∞(\G) is an index 2 subfactor of L^∞(O_n⁺), and thus solid and prime. Finally, we investigate strong Haagerup inequalities in the context of quantum symmetries arising from actions of free quantum groups on non-commutative random variables. We prove a generalization of the strong Haagerup inequality for \ast-free R-diagonal families due to Kemp and Speicher, and apply this result to study strong Haagerup inequalites for the free unitary quantum groups.

Subjects/Keywords: quantum groups ; operator algebras ; free probability ; approximation properties

…objective of this thesis to establish certain approximation properties + and for the reduced… …12 13 14 16 18 19 21 24 27 28 29 30 32 37 Approximation Properties for Free Orthogonal and… …Explicit Models . . . . . . . . . . . . . . . . . . . . . . . . . . Approximation Properties and… …Approximation Properties . . . . . . . . . . . . . . . . 4.4.4 A Remark on Exactness… …algebras [75, 78, 79, 80], the theory of approximation properties for groups initiated…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Brannan, M. P. (2012). On the Reduced Operator Algebras of Free Quantum Groups . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/7342

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Brannan, Michael Paul. “On the Reduced Operator Algebras of Free Quantum Groups .” 2012. Thesis, Queens University. Accessed February 27, 2021. http://hdl.handle.net/1974/7342.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Brannan, Michael Paul. “On the Reduced Operator Algebras of Free Quantum Groups .” 2012. Web. 27 Feb 2021.

Vancouver:

Brannan MP. On the Reduced Operator Algebras of Free Quantum Groups . [Internet] [Thesis]. Queens University; 2012. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1974/7342.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Brannan MP. On the Reduced Operator Algebras of Free Quantum Groups . [Thesis]. Queens University; 2012. Available from: http://hdl.handle.net/1974/7342

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

7. Lemeux, Francois. Sur la théorie des représentations et les algèbres d'opérateurs des produits en couronnes libres : on the representation theory and the operator algebra of the free wreath products.

Degree: Docteur es, Mathématiques et applications, 2014, Besançon

URL: http://www.theses.fr/2014BESA2008

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Dans cette thèse, on étudie les propriétés combinatoires, algébriques et analytiques de certains groupes quantiques compacts libres. on prouve au chapitre 2 que les duaux… (more)

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Dans cette thèse, on étudie les propriétés combinatoires, algébriques et analytiques de certains groupes quantiques compacts libres. on prouve au chapitre 2 que les duaux des groupes quantiques de réflexions complexes possèdent, dans la plus part des cas, la propriété d'approximation de Haagerup. au chapitre 3, on décrit les règles de fusion du produit en, couronne libre d'un groupe discret par le groupe quantique des permutations. Pour cela on détermine les espaces d'entrelaceurs entre certaines coreprésentation "basiques" de ces produits en couronnes libres en termes de partitions non croisées décorées par les éléments du groupe. On peut alors identifier les coreprésentations irréductibles et décrire les règles de fusion. On propose ensuite plusieurs applications de ce résultat. On démontre premièrement que les C*-algèbres réduites de ces produits en couronnes libres sont sans la plupart des cas simples et à trace unique. Puis on prouve que les algèbres se von Neumann associées sont des facteurs de type II et que ces facteurs sont pleins. On étend finalement le résultat du chapitre 2, aux produits en couronnes libres des groupes finis par le groupe quantique de permutations.

In this thesis, we study the combinatorial and operator algebraic properties of certain free compact quantum groups. We prove in chapter 2 that the duals of the quantum reflexion groups have, in most cases, the Haagerup property. In chapter 3, we describe the fusion rules of the free wreath product of a discrete group by the quantum permutation group. To do this, we describe the interrwinner spaces berween certain “basic” corepresentations of these free wreath products in terms of non-crossing partitions decorated by the elements of the group . This provides a whole new class of compact quantum groups whose fusions rules are explicitly computed. We give several applications of this result.We prove that, in most cases, the reduced C*-algebras associates with these free wreath products are simple with unique trace. We also prove that the associated II 1 factors are full. To conclude, we extend the result of chapter 2 to the free wreath products of finite groups by the quantum permutation group.

Advisors/Committee Members: Franz, Uwe (thesis director), Vergnioux, Roland (thesis director).

Subjects/Keywords: Groupe quantique cantiques compacts; Catégorie de représentations; Algèbre d'opérateurs; Propriétés d'aproximation; Compact quantum groups; Representation category; Operator algebras; Approximation properties; 512; 46L54; 46L80; 20G42; 46L52

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lemeux, F. (2014). Sur la théorie des représentations et les algèbres d'opérateurs des produits en couronnes libres : on the representation theory and the operator algebra of the free wreath products. (Doctoral Dissertation). Besançon. Retrieved from http://www.theses.fr/2014BESA2008

Chicago Manual of Style (16^th Edition):

Lemeux, Francois. “Sur la théorie des représentations et les algèbres d'opérateurs des produits en couronnes libres : on the representation theory and the operator algebra of the free wreath products.” 2014. Doctoral Dissertation, Besançon. Accessed February 27, 2021. http://www.theses.fr/2014BESA2008.

MLA Handbook (7^th Edition):

Lemeux, Francois. “Sur la théorie des représentations et les algèbres d'opérateurs des produits en couronnes libres : on the representation theory and the operator algebra of the free wreath products.” 2014. Web. 27 Feb 2021.

Vancouver:

Lemeux F. Sur la théorie des représentations et les algèbres d'opérateurs des produits en couronnes libres : on the representation theory and the operator algebra of the free wreath products. [Internet] [Doctoral dissertation]. Besançon; 2014. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2014BESA2008.

Council of Science Editors:

Lemeux F. Sur la théorie des représentations et les algèbres d'opérateurs des produits en couronnes libres : on the representation theory and the operator algebra of the free wreath products. [Doctoral Dissertation]. Besançon; 2014. Available from: http://www.theses.fr/2014BESA2008

University of Technology, Sydney

8. Soulé de Bas, Benjamin Jean-Sébastien. Modelling the properties of gold nanoproperties.

Degree: 2005, University of Technology, Sydney

URL: http://hdl.handle.net/10453/37212

► The physical and chemical properties of gold nanoparticles were investigated using first-principles density-functional theory in the local density approximation. The low-energy structures of gold nanoparticles… (more)

▼ The physical and chemical properties of gold nanoparticles were investigated using first-principles density-functional theory in the local density approximation. The low-energy structures of gold nanoparticles containing from 3 to 38 atoms were determined using a combination of semi-empirical potential and DFT calculations. At the DFT-LSDA level, planar structures persist up to Au6 and lie close in energy to the 3D ground-state structures for 7 ≤ n ≤ 10 atoms. Ordered structures are predicted as being stable for n ≤ 9. Beyond this size, disordered structures dominate with the notable exception of the tetrahedral Au20. The present DFT calculations predict numerous structural isomers being energetically equivalent or lying close in energy to the ground-state structures. The HOMO-LUMO energy gap is found to decrease as the cluster size increases, which indicates a transition towards a metallic behaviour at larger sizes. The thermal behaviour of gold clusters containing 7, 13 and 20 atoms was investigated using isothermal density-functional molecular-dynamics simulations. At each size, the global minimum energy structure and a low lying isomer are used as the starting structures. In most cases, the clusters exhibit high-temperature melting without showing any sharp transition from a solid-like to a liquid-like phase, but rather pass through a region of transformation between structural isomers. The starting structure used in the simulation is shown to have a considerable effect upon the subsequent thermal behaviour. The Au20 ground-state structure contrasts with the other clusters and remains tetrahedral up to its melting at about 1200 K. The adsorption of Au2o on a regular and defective (100) MgO surface was investigated using a combination of DFT MID simulations, single-point calculations and structure optimisations. Au20 is found to bind quite weakly to the regular (100) MgO surface, favouring Au-O interactions. The Mulliken population analysis used in conjunction with charge density maps reveals that the resulting bond mainly arises from an electrostatic polarisation of the cluster by the substrate. When adsorbed on a surface F-centre defect. Au20 binds to the oxide surface with a significantly enhanced strength. The analysis of the resulting interaction indicates that, in addition to being polarised, Au20 is charged by the defective surface. Based upon the results of the present investigation, different reaction mechanisms for the oxidation of CO by Au20 supported on MgO are proposed.

Subjects/Keywords: Gold nanoparticles.; Chemical properties.; Local density approximation.; DFT calculations.; Mulliken population analysis .

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Soulé de Bas, B. J. (2005). Modelling the properties of gold nanoproperties. (Thesis). University of Technology, Sydney. Retrieved from http://hdl.handle.net/10453/37212

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Soulé de Bas, Benjamin Jean-Sébastien. “Modelling the properties of gold nanoproperties.” 2005. Thesis, University of Technology, Sydney. Accessed February 27, 2021. http://hdl.handle.net/10453/37212.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Soulé de Bas, Benjamin Jean-Sébastien. “Modelling the properties of gold nanoproperties.” 2005. Web. 27 Feb 2021.

Vancouver:

Soulé de Bas BJ. Modelling the properties of gold nanoproperties. [Internet] [Thesis]. University of Technology, Sydney; 2005. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10453/37212.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Soulé de Bas BJ. Modelling the properties of gold nanoproperties. [Thesis]. University of Technology, Sydney; 2005. Available from: http://hdl.handle.net/10453/37212

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

9. Zeng, Zaiping. Electronic and optical properties of semiconductor nanostructures.

Degree: 2014, University of Patras; Πανεπιστήμιο Πατρών

URL: http://hdl.handle.net/10442/hedi/39733

►

The goal of this Thesis is to study the electronic and optical properties of semiconductor nanostructuresby employing different theories. The work present in this Thesis… (more)

▼

The goal of this Thesis is to study the electronic and optical properties of semiconductor nanostructuresby employing different theories. The work present in this Thesis is divided into three parts.Part I is devoted to the effective-mass theory and its several applications. A general description of theeffective mass theory and several ways of solving the effective-mass Schrodinger equation with anemphasis on the potential morphing method are given in the first chapter. In the following few chapters,we apply these theories in many realistic systems for the study of many properties.They include: i) the binding energy of hydrogentic donor impurity in semiconductor quantum dots underthe influence of static electric field and/or magnetic field, ii) the linear and nonlinear optical propertiesassociated with intraband transitions in semiconductor quantum dots, core shell quantum dots andquantum-dot-quantum-ring systems.Part II is devoted to the pseudopotential theory and its several applications. The background theoriesprimarily regarding to the empirical pseudopotential method and configuration interaction approach aredescribed in the first chapter. In the following few chapters, we employ these theories for the study ofthe electronic and optical properties of many nanostructures of group II-VI materials. The opticalproperties studied herein include the band gap, Stokes shift, exciton fine structure, optical polarizationand absorption spectra.Part III is devoted to the appendix, where twelve published papers are presented.

Στόχος της παρούσας διατριβής είναι η μελέτη των ηλεκτρονικών και οπτικών ιδιοτήτων νανοδομώνημιαγωγών κάνοντας χρήση κατάλληλων υπολογιστικών μεθόδων και τεχνικών. Η διατριβή χωρίζεταισε τρία μέρη.Το πρώτο μέρος εστιάζει στην θεωρία της ενεργούς μάζας (Effective-mass Theory) και τις εφαρμογέςτης. Στο πρώτο κεφάλαιο παρουσιάζεται το απαραίτητο θεωρητικό υπόβαθρο και δίνεται μίασυνοπτική περιγραφή των συνηθέστερων μεθόδων επίλυσης της μονοηλεκτρονιακής εξίσωσης τουSchrodinger, δίνοντας ιδιαίτερη έμφαση στην μέθοδο μορφοποίησης δυναμικού (Potential MorphingMethod). Στα επόμενα κεφάλαια του πρώτου μέρους οι τεχνικές και μέθοδοι που περιγράφηκανχρησιμοποιούνται για την μελέτη κρίσιμων ιδιοτήτων και παραμέτρων σε νανοσυστήματα ημιαγωγών.Μεταξύ αυτών είναι: i) η ενέργεια δέσμευσης υδρογονοειδών προσμίξεων τύπου δότη υπό τηνεπίδραση στατικού ηλεκτρικού ή/και μαγνητικού πεδίου, ii) γραμμικές και μη γραμμικές οπτικέςιδιότητες που συνδέονται με intraband μεταβάσεις εντός ζώνης σε κβαντικές τελείες ημιαγωγών,κβαντικές τελείες με δομή πυρήνα-φλοιού και σε μεικτά συστήματα κβαντικής τελείας – κβαντικούδακτυλίου.Το δεύτερο μέρος εστιάζει στην θεωρία των ψευδοδυνάμικών και τις εφαρμογές της. Αρχικάπαρουσιάζεται το απαραίτητο θεωρητικό υπόβαθρο της μεθόδου εμπειρικών ψευδοδυναμικών(Empirical Pseudopotential Method) καθώς επίσης και της μεθόδου αλληλεπίδρασης διαμορφώσεων(Configuration Interaction). Στην συνέχεια, οι προαναφερθείσες τεχνικές εφαρμόζονται στην μελέτη τωνηλεκτρονικών και οπτικών ιδιοτήτων σε μία πληθώρα…

Subjects/Keywords: Νανοδομές ημιαγωγών; Προσέγγιση ενεργούς μάζας; Γραμμικές και μη γραμμικές οπτικές ιδιότητες; Μέθοδος ψευδοδυναμικών; Αλληλεπίδραση διαμορφώσεων; Semiconductor nanostructures; Effective mass approximation; Linear and nonlinear optical properties; Pseudopotential theory; Configuration interaction

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zeng, Z. (2014). Electronic and optical properties of semiconductor nanostructures. (Thesis). University of Patras; Πανεπιστήμιο Πατρών. Retrieved from http://hdl.handle.net/10442/hedi/39733

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zeng, Zaiping. “Electronic and optical properties of semiconductor nanostructures.” 2014. Thesis, University of Patras; Πανεπιστήμιο Πατρών. Accessed February 27, 2021. http://hdl.handle.net/10442/hedi/39733.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zeng, Zaiping. “Electronic and optical properties of semiconductor nanostructures.” 2014. Web. 27 Feb 2021.

Vancouver:

Zeng Z. Electronic and optical properties of semiconductor nanostructures. [Internet] [Thesis]. University of Patras; Πανεπιστήμιο Πατρών; 2014. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10442/hedi/39733.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zeng Z. Electronic and optical properties of semiconductor nanostructures. [Thesis]. University of Patras; Πανεπιστήμιο Πατρών; 2014. Available from: http://hdl.handle.net/10442/hedi/39733

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

10. Garcia Fernandez, Carlos. Modeling Optical Properties of Combustion Soot emitted in the Troposphere : Modélisation de la réponse optique des particules de suie émises dans la Troposphère.

Degree: Docteur es, Physique, 2015, Besançon; Instituto superior de Tecnologias Y Ciencias Aplicadas de Cuba

URL: http://www.theses.fr/2015BESA2040

►

Ce travail concerne la modélisation, à l’échelle moléculaire, de l’interaction entre des nanoparticules carbonées et le rayonnement électromagnétique. Le but est d’aider à la compréhension… (more)

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Ce travail concerne la modélisation, à l’échelle moléculaire, de l’interaction entre des nanoparticules carbonées et le rayonnement électromagnétique. Le but est d’aider à la compréhension des propriétés optiques des particules de suie afin de mieux quantifier l’influence des suies sur l’atmosphère et le climat. L’étude de l’interaction rayonnement/particules de suie fraîche a été effectuée par la méthode PDI ; il a été montré que : i) le coefficient d’absorption massique (MAC) des particules de suie dépend de la répartition des atomes dans la particule et de leurs liaisons, en particulier entre 200 et 350 nm ; ii) le MAC diffère selon que le cœur de la particule carbonée est occupé ou non par des plans graphitiques ; iii) un modèle analytique n’est pas adapté pour calculer le MAC d’une nanoparticule carbonée présentant des défauts structuraux. De plus, des méthodes de chimie quantique ont été utilisées pour caractériser le vieillissement des suies. Les résultats montrent que : i) NO, Cl, et HCl sont physisorbées sur une surface carbonée parfaite alors que sur une surface défective, ces espèces sont chimisorbées et conduisent à une modification de la surface ; ii) la présence de Cl conduit à un piégeage fort des molécules d’eau supérieur à celui obtenu lorsqu’un site oxygéné est présent sur la surface carbonée, expliquant ainsi le caractère hydrophile des suies émises lors d’incendies dans des milieux industriels. Enfin, la méthode PDI a été appliquée au calcul de la polarisabilité de HAP afin d’interpréter des spectres d’absorption des grains carbonés du milieu interstellaire, en incluant des molécules pour lesquelles aucune donnée n’était actuellement disponible.

This work concerns the modeling, at the molecular level, of the interaction between carbonaceous particles of nanometric size and the electromagnetic radiation. The goal is to improve our understanding of the optical properties of soot particles, to better quantify the influence of soot on the atmosphere and on climate change. The study of the interaction between radiation and fresh soot particles was carried out using the point dipole interaction method; it has been shown that: i) the mass absorption coefficient (MAC) of these soot nanoparticles may significantly depend on their atomistic details, especially between 200 and 350 nm; ii) the MAC depends on whether the heart of the carbonaceous particle is occupied or not by graphite planes; iii) an analytical model is not suitable for calculating the MAC of carbonaceous nanoparticles having structural defects. In addition, quantum chemical methods have been used to characterize the ageing of soot. The results obtained are i) NO, Cl, and HCl are physisorbed on a perfect carbonaceous surface whereas on a defective surface, these species are chemisorbed and lead to a modification of the surface; ii) on a carbonaceous surface, the presence of adsorbed Cl atoms leads to a strong trapping of the surrounding water molecules. This may be related to the highly hydrophilic nature of soot emitted during fires in…

Advisors/Committee Members: Picaud, Sylvain (thesis director), Rubayo Soneira, Jesús (thesis director).

Subjects/Keywords: Suie; Propriétés optiques à l’échelle nanométrique; Coefficient d’absorption massique (MAC); PDI (Point Dipole Interaction); DDA (Discrete Dipole Approximation); Espèces chlorées; Adsorption; Modélisation; Soot; Optical properties at the nanometer scale; Mass Absorption Coefficient (MAC); PDI (Point Dipole Interaction); DDA (Discrete Dipole Approximation); Chlorinated species; Adsorption; Modeling; 539

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Garcia Fernandez, C. (2015). Modeling Optical Properties of Combustion Soot emitted in the Troposphere : Modélisation de la réponse optique des particules de suie émises dans la Troposphère. (Doctoral Dissertation). Besançon; Instituto superior de Tecnologias Y Ciencias Aplicadas de Cuba. Retrieved from http://www.theses.fr/2015BESA2040

Chicago Manual of Style (16^th Edition):

Garcia Fernandez, Carlos. “Modeling Optical Properties of Combustion Soot emitted in the Troposphere : Modélisation de la réponse optique des particules de suie émises dans la Troposphère.” 2015. Doctoral Dissertation, Besançon; Instituto superior de Tecnologias Y Ciencias Aplicadas de Cuba. Accessed February 27, 2021. http://www.theses.fr/2015BESA2040.

MLA Handbook (7^th Edition):

Garcia Fernandez, Carlos. “Modeling Optical Properties of Combustion Soot emitted in the Troposphere : Modélisation de la réponse optique des particules de suie émises dans la Troposphère.” 2015. Web. 27 Feb 2021.

Vancouver:

Garcia Fernandez C. Modeling Optical Properties of Combustion Soot emitted in the Troposphere : Modélisation de la réponse optique des particules de suie émises dans la Troposphère. [Internet] [Doctoral dissertation]. Besançon; Instituto superior de Tecnologias Y Ciencias Aplicadas de Cuba; 2015. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2015BESA2040.

Council of Science Editors:

Garcia Fernandez C. Modeling Optical Properties of Combustion Soot emitted in the Troposphere : Modélisation de la réponse optique des particules de suie émises dans la Troposphère. [Doctoral Dissertation]. Besançon; Instituto superior de Tecnologias Y Ciencias Aplicadas de Cuba; 2015. Available from: http://www.theses.fr/2015BESA2040

11. Pozzi, Élodie. Propriétés spectrales et universalité d’opérateurs de composition pondérés : Spectral properties and universality of weighted composition operators.

Degree: Docteur es, Mathématiques, 2011, Université Claude Bernard – Lyon I

URL: http://www.theses.fr/2011LYO10186

►

Cette thèse est dédiée à l'étude d'opérateurs de composition pondérés sur plusieurs espaces fonctionnels sous fond du problème du sous-espace invariant. Cet important problème ouvert… (more)

▼

Cette thèse est dédiée à l'étude d'opérateurs de composition pondérés sur plusieurs espaces fonctionnels sous fond du problème du sous-espace invariant. Cet important problème ouvert pose la question de l'existence pour tout opérateur sur un espace de Hilbert, complexe, séparable de dimension infinie, d'un sous-espace fermé, non-trivial et invariant par cet opérateur. La première partie est consacrée à l'étude spectrale et à la caractérisation des vecteurs cycliques d'un opérateur de composition à poids particulier sur L²([0,1]^d) : l'opérateur de type Bishop, introduit comme possible contre-exemple au problème du sous-espace invariant. Les seconde, troisième et quatrième parties abordent ce problème sous un autre aspect : celui de l'universalité d'un opérateur. Ces opérateurs universels possèdent la propriété d'universalité : la description complète des sous-espaces invariants d'un opérateur universel permettrait de répondre au problème du sous-espace invariant. Déterminer l'universalité d'un opérateur repose sur l'établissement de propriétés spectrales fines de l’opérateur considéré (théorème de Caradus). Dans ce but, nous établissons des propriétés spectrales ad-hoc de classes d’opérateurs de composition à poids sur L²([0,1]), les espaces de Sobolev d’ordre n, sur les espaces de Hardy du disque unité et du demi-plan supérieur, permettant de déduire des résultats d’universalité. Nous obtenons aussi une généralisation du critère d’universalité. Dans la dernière partie, nous donnons une caractérisation des opérateurs de composition rsid16415432 inversibles et une caractérisation partielle des opérateurs de composition isométriques sur les espaces de Hardy de l’anneau

In this thesis, we study classes of weighted composition operators on several functional spaces in the background of the invariant subspace problem. This important open problem asks the question of the existence for every operator, defined on a complex and separable infinite dimensional Hilbert space, of a non trivial closed subspace invariant under the operator. The first part is dedicated to the establishment of the spectrum and the characterization of cyclic vectors of a special weighted composition operator defined on L²([0,1]^d) : the Bishop type operator, introduced as possible counter-example of the invariant subspace problem. The second, third and fourth part approach the problem from the point of view of universal operators. More precisely, universal operators have the universal property in the sense of the complete description of all the invariant subspaces of a universal operator could solve the invariant subspace problem. A sufficient condition for an operator to be universal (Caradus’theorem) is given in terms of spectral properties. To this aim, we establish ad-hoc spectral properties of a class of weighted composition operators on L²([0,1]) and Sobolev spaces of order n, of composition operator in the Hardy space of the unit disc and of the upper half-plane, which lead us to deduce universality results. We also obtain a…

Advisors/Committee Members: Chalendar, Isabelle (thesis director).

Subjects/Keywords: Opérateurs de composition à poids; Shifts pondérés; Espaces de Sobolev; Espaces de Hardy du demi-plan supérieur; Espaces de Hardy de l'anneau; Propriétés spectrales; Approximation diophantienne; Cyclicité; Weighted composition operators; Weighted shifts; Sobolev spaces; Hardy spaces of the upper half-plane; Hardy spaces of the annulus; Spectral properties; Diophantine approximation; Cyclicity; 515.7

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pozzi, �. (2011). Propriétés spectrales et universalité d’opérateurs de composition pondérés : Spectral properties and universality of weighted composition operators. (Doctoral Dissertation). Université Claude Bernard – Lyon I. Retrieved from http://www.theses.fr/2011LYO10186

Chicago Manual of Style (16^th Edition):

Pozzi, Élodie. “Propriétés spectrales et universalité d’opérateurs de composition pondérés : Spectral properties and universality of weighted composition operators.” 2011. Doctoral Dissertation, Université Claude Bernard – Lyon I. Accessed February 27, 2021. http://www.theses.fr/2011LYO10186.

MLA Handbook (7^th Edition):

Pozzi, Élodie. “Propriétés spectrales et universalité d’opérateurs de composition pondérés : Spectral properties and universality of weighted composition operators.” 2011. Web. 27 Feb 2021.

Vancouver:

Pozzi �. Propriétés spectrales et universalité d’opérateurs de composition pondérés : Spectral properties and universality of weighted composition operators. [Internet] [Doctoral dissertation]. Université Claude Bernard – Lyon I; 2011. [cited 2021 Feb 27]. Available from: http://www.theses.fr/2011LYO10186.

Council of Science Editors:

Pozzi �. Propriétés spectrales et universalité d’opérateurs de composition pondérés : Spectral properties and universality of weighted composition operators. [Doctoral Dissertation]. Université Claude Bernard – Lyon I; 2011. Available from: http://www.theses.fr/2011LYO10186

12. Zeng, Zaiping. Electronic and optical properties of semiconductor nanostructures.

Degree: 2014, University of Patras

URL: http://hdl.handle.net/10889/8431

►

The goal of this Thesis is to study the electronic and optical properties of semiconductor nanostructures by employing different theories. The work present in this… (more)

▼

The goal of this Thesis is to study the electronic and optical properties of semiconductor nanostructures by employing different theories. The work present in this Thesis is divided into three parts. Part I is devoted to the effective-mass theory and its several applications. A general description of the effective mass theory and several ways of solving the effective-mass Schrodinger equation with an emphasis on the potential morphing method are given in the first chapter. In the following few chapters, we apply these theories in many realistic systems for the study of many properties. They include: i) the binding energy of hydrogentic donor impurity in semiconductor quantum dots under the influence of static electric field and/or magnetic field, ii) the linear and nonlinear optical properties associated with intraband transitions in semiconductor quantum dots, core shell quantum dots and quantum-dot-quantum-ring systems. Part II is devoted to the pseudopotential theory and its several applications. The background theories primarily regarding to the empirical pseudopotential method and configuration interaction approach are described in the first chapter. In the following few chapters, we employ these theories for the study of the electronic and optical properties of many nanostructures of group II-VI materials. The optical properties studied herein include the band gap, Stokes shift, exciton fine structure, optical polarization and absorption spectra. Part III is devoted to the appendix, where twelve published papers are presented.

Στόχος της παρούσας διατριβής είναι η μελέτη των ηλεκτρονικών και οπτικών ιδιοτήτων νανοδομών ημιαγωγών κάνοντας χρήση κατάλληλων υπολογιστικών μεθόδων και τεχνικών. Η διατριβή χωρίζεται σε τρία μέρη. Το πρώτο μέρος εστιάζει στην θεωρία της ενεργούς μάζας (Effective-mass Theory) και τις εφαρμογές της. Στο πρώτο κεφάλαιο παρουσιάζεται το απαραίτητο θεωρητικό υπόβαθρο και δίνεται μία συνοπτική περιγραφή των συνηθέστερων μεθόδων επίλυσης της μονοηλεκτρονιακής εξίσωσης του Schrodinger,δίνοντας ιδιαίτερη έμφαση στην μέθοδο μορφοποίησης δυναμικού (Potential Morphing Method). Στα επόμενα κεφάλαια του πρώτου μέρους οι τεχνικές και μέθοδοι που περιγράφηκαν χρησιμοποιούνται για την μελέτη κρίσιμων ιδιοτήτων και παραμέτρων σε νανοσυστήματα ημιαγωγών. Μεταξύ αυτών είναι: i) η ενέργεια δέσμευσης υδρογονοειδών προσμίξεων τύπου δότη υπό την επίδραση στατικού ηλεκτρικού ή/και μαγνητικού πεδίου, ii) γραμμικές και μη γραμμικές οπτικές ιδιότητες που συνδέονται με intraband μεταβάσεις εντός ζώνης σε κβαντικές τελείες ημιαγωγών, κβαντικές τελείες με δομή πυρήνα-φλοιού και σε μεικτά συστήματα κβαντικής τελείας – κβαντικού δακτυλίου. Το δεύτερο μέρος εστιάζει στην θεωρία των ψευδοδυνάμικών και τις εφαρμογές της. Αρχικά παρουσιάζεται το απαραίτητο θεωρητικό υπόβαθρο της μεθόδου εμπειρικών ψευδοδυναμικών (Empirical Pseudopotential Method) καθώς επίσης και της μεθόδου αλληλεπίδρασης διαμορφώσεων (Configuration Interaction). Στην συνέχεια, οι προαναφερθείσες τεχνικές εφαρμόζονται στην μελέτη…

Advisors/Committee Members: Μπασκούτας, Σωτήριος, Τερζής, Ανδρέας, Bester, Gabriel, Πασπαλάκης, Εμμανουήλ, Γαλανάκης, Ιωσήφ, Κούτσελας, Ιωάννης, Βανακάρας, Αλέξανδρος, Μπασκούτας, Σωτήριος.

Subjects/Keywords: Semiconductor nanostructures; Effective mass approximation; Linear and nonlinear optical properties; Pseudopotential theory; Configuration interaction; 537.622 6; Νανοδομές ημιαγωγών; Προσέγγιση ενεργούς μάζας; Γραμμικές και μη γραμμικές οπτικές ιδιότητες; Μέθοδος ψευδοδυναμικών; Αλληλεπίδραση διαμορφώσεων

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zeng, Z. (2014). Electronic and optical properties of semiconductor nanostructures. (Doctoral Dissertation). University of Patras. Retrieved from http://hdl.handle.net/10889/8431

Chicago Manual of Style (16^th Edition):

Zeng, Zaiping. “Electronic and optical properties of semiconductor nanostructures.” 2014. Doctoral Dissertation, University of Patras. Accessed February 27, 2021. http://hdl.handle.net/10889/8431.

MLA Handbook (7^th Edition):

Zeng, Zaiping. “Electronic and optical properties of semiconductor nanostructures.” 2014. Web. 27 Feb 2021.

Vancouver:

Zeng Z. Electronic and optical properties of semiconductor nanostructures. [Internet] [Doctoral dissertation]. University of Patras; 2014. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10889/8431.

Council of Science Editors:

Zeng Z. Electronic and optical properties of semiconductor nanostructures. [Doctoral Dissertation]. University of Patras; 2014. Available from: http://hdl.handle.net/10889/8431

University of Victoria

13. Chen, Qian. Four essays in finite-sample econometrics.

Degree: Dept. of Economics, 2007, University of Victoria

URL: http://hdl.handle.net/1828/187

► In this dissertation, we explore the use of three different analytical techniques for approximating the finite-sample properties of estimators and test statistics. These techniques are… (more)

Subjects/Keywords: statistics; finite-sample properties; saddlepoint; approximation; econometrics; UVic Subject Index::Humanities and Social Sciences::Economics

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chen, Q. (2007). Four essays in finite-sample econometrics. (Thesis). University of Victoria. Retrieved from http://hdl.handle.net/1828/187

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chen, Qian. “Four essays in finite-sample econometrics.” 2007. Thesis, University of Victoria. Accessed February 27, 2021. http://hdl.handle.net/1828/187.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chen, Qian. “Four essays in finite-sample econometrics.” 2007. Web. 27 Feb 2021.

Vancouver:

Chen Q. Four essays in finite-sample econometrics. [Internet] [Thesis]. University of Victoria; 2007. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1828/187.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chen Q. Four essays in finite-sample econometrics. [Thesis]. University of Victoria; 2007. Available from: http://hdl.handle.net/1828/187

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Florida

14. Connolly, John William Domville, 1938-. The energy band structure of ferromagnetic nickel.

Degree: 1966, University of Florida

URL: https://ufdc.ufl.edu/AA00003563

Subjects/Keywords: Approximation; Atoms; Charge density; Electrons; Energy; Energy bands; Energy value; Fermi surfaces; Nickel; Wave functions; Ferromagnetism; Nickel – Magnetic properties

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APA (6^th Edition):

Connolly, John William Domville, 1. (1966). The energy band structure of ferromagnetic nickel. (Thesis). University of Florida. Retrieved from https://ufdc.ufl.edu/AA00003563

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Connolly, John William Domville, 1938-. “The energy band structure of ferromagnetic nickel.” 1966. Thesis, University of Florida. Accessed February 27, 2021. https://ufdc.ufl.edu/AA00003563.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Connolly, John William Domville, 1938-. “The energy band structure of ferromagnetic nickel.” 1966. Web. 27 Feb 2021.

Vancouver:

Connolly, John William Domville 1. The energy band structure of ferromagnetic nickel. [Internet] [Thesis]. University of Florida; 1966. [cited 2021 Feb 27]. Available from: https://ufdc.ufl.edu/AA00003563.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Connolly, John William Domville 1. The energy band structure of ferromagnetic nickel. [Thesis]. University of Florida; 1966. Available from: https://ufdc.ufl.edu/AA00003563

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

15. Ganesan, Krithiga. Radiative characterization of heterogeneous media for solar thermochemical applications.

Degree: PhD, Mechanical Engineering, 2013, University of Minnesota

URL: http://purl.umn.edu/146693

► Transport radiative properties of ceria ceramics as a function of wavelength and morphology are presented. Experimental facilities for measuring transmitted and re- flected radiant energy… (more)

▼ Transport radiative properties of ceria ceramics as a function of wavelength and morphology are presented. Experimental facilities for measuring transmitted and re- flected radiant energy were developed. A Monte Carlo ray-tracing technique was devel- oped to infer transport scattering coefficient and absorption coefficient from measured transmittance and reflectance. An experimental setup to measure normal-emittance of materials employed in solar thermochemical applications is also designed. This experi- mental setup can achieve temperatures on the order of 1500 K and facilitate maintaining an inert, oxidizing or reducing environment to control composition of materials. Transmittance and reflectance of two types of morphologies were examined. Sin- tered ceria discs with pores and grains of size a few microns and a random grain and pore structure, and a three-dimensionally ordered macro-porous (3DOM) ceria with nano-structured features were considered. The 3DOM samples were also ther- mochemically cycled for 60 cycles consisting of high-temperature reduction and low- temperature oxidation. Two porosities were considered for the sintered ceria discs with porosity, p = 0.08 (“dense” samples), and p = 0.72 (“porous” samples) and porosi- ties of the packed bed before and after themochemical cycling were 0.9 and 0.83 re-spectively. Morphological characterization was performed by Scanning Electron Mi- croscopy (SEM), and porosity was verified by mass and volume measurements of the samples. Sintered ceria discs had extremely high optical thickness, with low and uncertain values of directional-hemispherical transmittance, and bi-normal transmittance on the order of 0.001 %. The transport radiative properties did not show a strong wavelength dependence after a wavelength of 0.5 μm. The transport scattering coefficient was on the order of 30mm−1 for the porous ceramics and 15mm−1 for the dense ceramics after a wavelength of 0.5 μm. The absorption coefficient was on the order of 0.005 mm−1 for the dense ceramics and 0.03 mm−1 for the porous ceramics in the spectral range of weak absorption. Experimental uncertainty resulted in only approximate determination of transport radiative properties, particularly for the dense ceramics. For the 3DOM packed bed, measured transmittance was of higher accuracy lead- ing to lower uncertainty in measurements and identification procedure. The transport scattering coefficient showed a stronger spectral dependence than that of the sintered ceramics especially after a wavelength of 0.5 μm. Thermochemical cycling resulted in changes in the 3DOM morphology due to sintering of walls of the 3DOM struc- ture. The morphology of 3DOM ceria after thermochemical cycling resembled sintered structures and this change also impacted the predicted radiative properties. The trans- port scattering coefficient showed strong dependence on morphology, with a drastic increase by a factor of four for 3DOM packed bed after thermochemical cycling. The absorption coefficient was only…

Subjects/Keywords: Ceria; Radiative properties; Radiative transfer; Solar thermochemical cycles; Spectroscopy; Transport approximation

…radiative properties of ceria morphologies 6.1 71 Methodology… …6.3.2 6.4 Modified two-flux approximation . . . . . . . . . . . . . . . . 86 Mie theory for… …2.2 Methods to determine radiative properties of participating media . . . . 16 2.3 A… …fuel cells etc. One of the favorable properties of ceria is its redox capability. Ceria forms… …Radiative properties of ceria are crucial at this modeling step, since they appear in heat…

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APA (6^th Edition):

Ganesan, K. (2013). Radiative characterization of heterogeneous media for solar thermochemical applications. (Doctoral Dissertation). University of Minnesota. Retrieved from http://purl.umn.edu/146693

Chicago Manual of Style (16^th Edition):

Ganesan, Krithiga. “Radiative characterization of heterogeneous media for solar thermochemical applications.” 2013. Doctoral Dissertation, University of Minnesota. Accessed February 27, 2021. http://purl.umn.edu/146693.

MLA Handbook (7^th Edition):

Ganesan, Krithiga. “Radiative characterization of heterogeneous media for solar thermochemical applications.” 2013. Web. 27 Feb 2021.

Vancouver:

Ganesan K. Radiative characterization of heterogeneous media for solar thermochemical applications. [Internet] [Doctoral dissertation]. University of Minnesota; 2013. [cited 2021 Feb 27]. Available from: http://purl.umn.edu/146693.

Council of Science Editors:

Ganesan K. Radiative characterization of heterogeneous media for solar thermochemical applications. [Doctoral Dissertation]. University of Minnesota; 2013. Available from: http://purl.umn.edu/146693

16. Biswas, Koushik. Theoretical investigation of type II clathrate materials.

Degree: Physics, 2007, Texas Tech University

URL: http://hdl.handle.net/2346/21742

► Thermoelectric effects were discovered in the early 19th century. Seebeck (1821) discovered that a voltage appears when two different conductors are joined together and the… (more)

▼ Thermoelectric effects were discovered in the early 19th century. Seebeck (1821) discovered that a voltage appears when two different conductors are joined together and the junction is heated. The Peltier effect (1834) occurs when an electric current is passed through the junction between two conductors. The junction becomes heated or cooled according to the direction of current through it. These two effects combined constitute the thermoelectric phenomenon. Thermoelectric effect can have practical applications in the fields of alternate power generation (Seebeck effect) or as environment friendly refrigeration and cooling devices in modern electronics (Peltier effect). However, their performance would depend on the specific properties of the materials that are used to build those devices. A good thermoelectric material should have a high electrical conductivity like a metal, and low thermal conductivity, like a glass. One promising class of materials that fit the requirements for good thermolectrics is the semiconductor clathrates. Among the two major types of clathrate compounds, the type II clathrates has been relatively less investigated compared to the type I variety. The type II clathrates form a cage-like structure with 136 atoms in the cubic unit cell. The cages can accommodate weakly bound impurities or ï¿½guestsï¿½, usually Group I or Group II atoms. This unique structural characteristic lead to important electronic and vibrational properties which makes these materials potentially useful for various applications including thermoelectrics. This work is based on a theoretical study of the type II silicon (Si) and germanium (Ge) clathrates. It involves a systematic study of the structural, electronic and vibrational properties of several materials. The guest impurity atoms inside the clathrate cages modify the material electronic structure. Guest atom electrons occupy the host conduction band states, resulting in a Fermi Level shift into the conduction band of the ï¿½parentï¿½ framework, therefore making the materials metallic. This metallic character means that the electronic contribution to the total thermal conductivity could be large and hence such materials are not very useful as thermoelectrics. However, upon substitution of a few framework atoms by gallium (Ga) restores the semiconducting behavior of the partially filled materials. It indicates that the Ga atoms, with their s2p1 valence electronic configuration, accept electrons from the guest atoms and form covalent bonds with the neighboring Si atoms. The projected electronic density of the filled clathrates show the impurity derived s-orbital character of the states near the Fermi level. This feature may help to qualitatively explain the temperature-dependent Knight shift observed for the NMR-active nuclei in the filled clathrates. All the filled clathrates are predicted to have low frequency guest vibrational modes that are near the middle of the host acoustic band, which effectively compresses the acoustic mode band width. This…

Subjects/Keywords: Local density approximation; Phonons; Vibrational properties; Specific heat; Thermoelectric; Clathrates; Type II clathrate materials

…electronic contributions to the thermal conductivity, respectively. Although the properties favored… …properties. The best thermoelectric materials currently have ZT ~ 1 [2]. However, there… …suitable ptype material with compatible properties that could be incorporated into a single… …has been a great volume of work done on the unique properties of Bi-Sb alloys. Despite these… …thermoelectric research. Recent studies have revealed many important electrical and thermal properties…

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APA (6^th Edition):

Biswas, K. (2007). Theoretical investigation of type II clathrate materials. (Thesis). Texas Tech University. Retrieved from http://hdl.handle.net/2346/21742

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Biswas, Koushik. “Theoretical investigation of type II clathrate materials.” 2007. Thesis, Texas Tech University. Accessed February 27, 2021. http://hdl.handle.net/2346/21742.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Biswas, Koushik. “Theoretical investigation of type II clathrate materials.” 2007. Web. 27 Feb 2021.

Vancouver:

Biswas K. Theoretical investigation of type II clathrate materials. [Internet] [Thesis]. Texas Tech University; 2007. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/2346/21742.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Biswas K. Theoretical investigation of type II clathrate materials. [Thesis]. Texas Tech University; 2007. Available from: http://hdl.handle.net/2346/21742

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of North Texas

17. Wallace, Andrew B. Field Dependence of Optical Properties in Quantum Well Heterostructures Within the Wentzel, Kramers, and Brillouin Approximation.

Degree: 1989, University of North Texas

URL: https://digital.library.unt.edu/ark:/67531/metadc330576/

► This dissertation is a theoretical treatment of the electric field dependence of optical properties such as Quantum Confined Stark (QCS) shifts, Photoluminescence Quenching (PLQ), and… (more)

Subjects/Keywords: Quantum wells.; Electric fields.; WKB approximation.; electronic field dependence; optical properties; Quantum Confined Stark; Photoluminescence Quenching; excitonic mixing; quantum well heterostructures

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APA (6^th Edition):

Wallace, A. B. (1989). Field Dependence of Optical Properties in Quantum Well Heterostructures Within the Wentzel, Kramers, and Brillouin Approximation. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc330576/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wallace, Andrew B. “Field Dependence of Optical Properties in Quantum Well Heterostructures Within the Wentzel, Kramers, and Brillouin Approximation.” 1989. Thesis, University of North Texas. Accessed February 27, 2021. https://digital.library.unt.edu/ark:/67531/metadc330576/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wallace, Andrew B. “Field Dependence of Optical Properties in Quantum Well Heterostructures Within the Wentzel, Kramers, and Brillouin Approximation.” 1989. Web. 27 Feb 2021.

Vancouver:

Wallace AB. Field Dependence of Optical Properties in Quantum Well Heterostructures Within the Wentzel, Kramers, and Brillouin Approximation. [Internet] [Thesis]. University of North Texas; 1989. [cited 2021 Feb 27]. Available from: https://digital.library.unt.edu/ark:/67531/metadc330576/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wallace AB. Field Dependence of Optical Properties in Quantum Well Heterostructures Within the Wentzel, Kramers, and Brillouin Approximation. [Thesis]. University of North Texas; 1989. Available from: https://digital.library.unt.edu/ark:/67531/metadc330576/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Florida

18. Bokhan, Denis. Ab Initio Density Functional Theory for Open-Shell Systems, Excited States and Response Properties.

Degree: PhD, Chemistry, 2007, University of Florida

URL: https://ufdc.ufl.edu/UFE0021221

► Ab initio density functional theory (DFT) based on the optimized effective potential (OEP) method is a new approach to study the electronic structure of atomic,… (more)

▼ Ab initio density functional theory (DFT) based on the optimized effective potential (OEP) method is a new approach to study the electronic structure of atomic, molecular and^M solid state systems. It contains elements of both wave function and density functional theories and is free from limitations of conventional DFT because of using orbital-dependent functionals derived from systematic approximations of the wave function theory. Ab initio DFT methods with exchange-correlation functionals based on many-body perturbation theory (MBPT) have been derived and implemented recently. The exchange-correlation potentials derived from MBPT have a complicated structure and their derivation in higher-order of MBPT by the use of the chain-rule for functional differentiation requires significant effort. To facilitate such derivations, I developed a special diagrammatic formalism for taking functional derivatives. An alternative way to construct OEP MBPT exchange-correlation potentials is to use the density condition. It makes it possible to obtain potentials for different partitionings of the full molecular Hamiltonian with MBPT. Using the diagrammatic formalism developed for taking functional derivatives, we show an order-by-order equivalence between the functional derivative and the density condition approaches to OEP MBPT for the case of the Kohn-Sham partitioning of the molecular Hamiltonian. For any other partitionings, different exchange-correlation potentials are produced by the functional derivative and density condition approaches. The time-dependent extension of OEP in the adiabatic approximation with exchange-only potentials and kernels was recently implemented and applied to some molecular systems. The corresponding excitation energies and polarizabilities are in good agreement with time-dependent Hartree-Fock results. However, such results cannot be used for comparison with experimental values due to lack of a description of electron correlation effects. In order to account for correlation effects, a correlation kernel corresponding to the MBPT(2) potentials has been derived. Its structure and properties are described in detail. The first numerical results for excitation energies with pure ab initio potentials and kernels are presented. The recently implemented OEP MBPT(2) method has been extended to the case of spin-polarized open-shell systems. The total energies obtained for several open-shell systems are very close to the corresponding values obtained with the highly-correlated coupled cluster singles and doubles with perturbative triples (CCSD(T)) method. Comparison with results obtained with the OEP MBPT(2) exchange-correlation potentials and some density functionals has shown a qualitatively incorrect shape for some widely used exchange-correlation potentials. Higher-order response properties, such as hyperpolarizabilities, are described very poorly with conventional functionals. The typical relative errors described in the literature are about 100 percent. The reason for the poor description is an incorrect… Advisors/Committee Members: Bartlett, Rodney J. (committee chair), Monkhorst, Hendrik J. (committee member), Hirata, So (committee member), Ohrn, Nils Y. (committee member), Hershfield, Selman P. (committee member).

Subjects/Keywords: Approximation; Atoms; Density functional theory; Diagrams; Electrons; Energy; Flux density; Orbitals; Perturbation theory; Wave functions; density, effective, excited, functional, hyperpolarizabilities, open, optimized, potential, properties, response, shell, states, system, theory

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bokhan, D. (2007). Ab Initio Density Functional Theory for Open-Shell Systems, Excited States and Response Properties. (Doctoral Dissertation). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0021221

Chicago Manual of Style (16^th Edition):

Bokhan, Denis. “Ab Initio Density Functional Theory for Open-Shell Systems, Excited States and Response Properties.” 2007. Doctoral Dissertation, University of Florida. Accessed February 27, 2021. https://ufdc.ufl.edu/UFE0021221.

MLA Handbook (7^th Edition):

Bokhan, Denis. “Ab Initio Density Functional Theory for Open-Shell Systems, Excited States and Response Properties.” 2007. Web. 27 Feb 2021.

Vancouver:

Bokhan D. Ab Initio Density Functional Theory for Open-Shell Systems, Excited States and Response Properties. [Internet] [Doctoral dissertation]. University of Florida; 2007. [cited 2021 Feb 27]. Available from: https://ufdc.ufl.edu/UFE0021221.

Council of Science Editors:

Bokhan D. Ab Initio Density Functional Theory for Open-Shell Systems, Excited States and Response Properties. [Doctoral Dissertation]. University of Florida; 2007. Available from: https://ufdc.ufl.edu/UFE0021221

University of Toronto

19. Barcena, Salvador Rego. A Passive Mid-infrared Sensor to Measure Real-time Particle Emissivity and Gas Temperature in Coal-fired Boilers and Steelmaking Furnaces.

Degree: 2008, University of Toronto

URL: http://hdl.handle.net/1807/11251

►

A novel technique for measuring gas temperature and spectral particle emissivity in high-temperature gas-particle streams is presented. The main application of this optical sensor is… (more)

▼

A novel technique for measuring gas temperature and spectral particle emissivity in high-temperature gas-particle streams is presented. The main application of this optical sensor is to improve the process control of batch unit operations, such as steelmaking furnaces. The spectral emission profile of CO and CO2 and the continuous particle emission in the 3.5 to 5 μm wavelength region was recorded and analyzed in real time with a low-resolution passive sensor. The sensor consisted of light collecting optics, a dispersion element (grating spectrometer) and a 64-pixel pyroelectric array. Wavelength and radiance calibrations were performed. The temperature of the gas-particle medium (Tg+p) followed from the least-squares minimization of the difference between the measured radiance in the 4.56-4.7 μm region –which saturates due to the large CO2 concentrations and path lengths in industrial furnaces– and the corresponding blackbody radiance. Particle emissivity (εp) was calculated at 3.95 μm from an asymptotic approximation of the Radiative Transfer Equation that yields the emerging radiance from a semi-infinite particle cloud. The major source of error in the magnitude of Tg+p and εp could come from particle scattering. Through the method of embedded invariance an expression was developed to estimate the lowering effect of particle size and volume fraction on the saturation of the 4.56-4.7 μm CO2 emission region. An iterative procedure for correcting the values of the gas-particle temperature and particle emissivity was applied to the datasets from the two industrial tests. Results from the measurement campaigns with the infrared sensor prototype at two full-scale furnaces are presented. A proof-of-concept test at a coal-fired boiler for electricity production was followed by more extensive measurements at a Basic Oxygen Furnace (BOF) for steelmaking. The second test provided temperature and particle emissivity profiles for eight heats, which highlighted the simplicity of the technique in obtaining in-situ measurements for modeling studies. Through the analysis of the particle emissivity profile in the BOF and the definition of a new variable –the minimum carbon time– a novel end-point strategy to stop the injection of high-purity oxygen during low-carbon heats in BOF converters was proposed.

PhD

Advisors/Committee Members: Thomson, Murray J., Mechanical and Industrial Engineering.

Subjects/Keywords: spectral particle emissivity; off-gas temperature; combustion diagnostics; mid-infrared emission spectroscopy; pyroelectric detector; optically thick assumption; gas-particle medium; coal-fired boiler; embedded invariance; particle scattering; Basic Oxygen Furnace (BOF); oxygen lance end-point; steel composition and temperature; first turndown properties; remote sensing; asymptotic approximation of the Radiative Transfer Equation; 0548

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APA (6^th Edition):

Barcena, S. R. (2008). A Passive Mid-infrared Sensor to Measure Real-time Particle Emissivity and Gas Temperature in Coal-fired Boilers and Steelmaking Furnaces. (Doctoral Dissertation). University of Toronto. Retrieved from http://hdl.handle.net/1807/11251

Chicago Manual of Style (16^th Edition):

Barcena, Salvador Rego. “A Passive Mid-infrared Sensor to Measure Real-time Particle Emissivity and Gas Temperature in Coal-fired Boilers and Steelmaking Furnaces.” 2008. Doctoral Dissertation, University of Toronto. Accessed February 27, 2021. http://hdl.handle.net/1807/11251.

MLA Handbook (7^th Edition):

Barcena, Salvador Rego. “A Passive Mid-infrared Sensor to Measure Real-time Particle Emissivity and Gas Temperature in Coal-fired Boilers and Steelmaking Furnaces.” 2008. Web. 27 Feb 2021.

Vancouver:

Barcena SR. A Passive Mid-infrared Sensor to Measure Real-time Particle Emissivity and Gas Temperature in Coal-fired Boilers and Steelmaking Furnaces. [Internet] [Doctoral dissertation]. University of Toronto; 2008. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/1807/11251.

Council of Science Editors:

Barcena SR. A Passive Mid-infrared Sensor to Measure Real-time Particle Emissivity and Gas Temperature in Coal-fired Boilers and Steelmaking Furnaces. [Doctoral Dissertation]. University of Toronto; 2008. Available from: http://hdl.handle.net/1807/11251

20. Φθενάκης, Ζαχαρίας. Μελέτη δομικών, ηλεκτρονικών, θερμοδυναμικών και μαγνητικών ιδιοτήτων συσσωματωμάτων, με τη μέθοδο της μοριακής δυναμικής στην προσέγγιση της ισχυρής δέσμευσης.

Degree: 2010, University of Crete (UOC); Πανεπιστήμιο Κρήτης

URL: http://hdl.handle.net/10442/hedi/18893

►

In the present thesis we study the structural, electronic, thermodynamic and magnetic properties of clusters using the tight binding molecular dynamics method. Our study has… (more)

▼

In the present thesis we study the structural, electronic, thermodynamic and magnetic properties of clusters using the tight binding molecular dynamics method. Our study has to do: (a) with the structural properties and energetics of C fullerene isomers and the rehybridization of their atomic orbital, (b) with the same properties of Si fullerenes, (c) with the thermodynamic and magnetic properties of small Ni clusters and (d) with the thermodynamic and magnetic properties of larger Ni clusters. Our basic conclusions are the following: (a) There is a certain relation between cohesive energy of C fullerene isomers, their pentagon adjacencies and their atoms, (b) Si fullerenes isomers are almost isoenergetic, bolt of their atoms are almost coplanar to their first neighbours and the other half form sharp edges, (c) the melting temperatures of small Ni clusters were found, (d) there is a linear relation between melting and Curie temperature.

Η μέθοδος ισχυρής δέσμευσης βρίσκεται ανάμεσα στις πολύ ακριβείς και πολύ χρονοβόρες υπολογιστικά μεθόδους πρώτων αρχών και στις λιγότερο ακριβείς αλλά πολύ γρήγορες υπολογιστικά μεθόδους των κλασικών δυναμικών. Συγκρίνοντας τους χρόνους υπολογισμού μεταξύ αυτών των μεθόδων, η μέθοδος της ισχυρής δέσμευσης είναι δύο με τρεις τάξεις μεγέθους πιο γρήγορη υπολογιστικά μέθοδος απ' ότι οι μέθοδοι πρώτων αρχών και δύο με τρεις τάξεις μεγέθους πιο αργή από τις μεθόδους κλασικών δυναμικών. Η περιγραφή ενός συστήματος στα πλαίσια της προσέγγισης ισχυρής δέσμευσης υπερέχει έναντι των κλασικών δυναμικών, επειδή η περιγραφή αυτή γίνεται με καθαρά κβαντομηχανικούς όρους. Αυτό, κατά κανόνα, της δίνει το πλεονέκτημα να μπορεί να περιγράψει σωστά τη γωνιακή εξάρτηση του δεσμού για οποιαδήποτε διάταξη των ατόμων του συστήματος, κάτι που δεν περιγράφεται με ακρίβεια από τα κλασικά δυναμικά. Υστερεί όμως στην ακρίβεια αυτής της περιγραφής έναντι των μεθόδων πρώτων αρχών. Η προσέγγιση της ισχυρής δέσμευσης μπορεί να προέλθει από την προσέγγιση του συναρτησοειδούς της ηλεκτρονιακής πυκνότητας, κάτι το οποίο ανακαλύφθηκε πολύ αργότερα, από τότε που χρησιμοποιήθηκε η προσέγγιση για πρώτη φορά. Η ιδέα της προσέγγισης της ισχυρής δέσμευσης είναι ότι τα άτομα ενός συστήματος αλληλεπιδρούν μεταξύ τους με τέτοιο τρόπο ώστε η κάθε μονοηλεκτρονιακή κυματοσυνάρτηση του συστήματος να διατηρεί τα βασικά χαρακτηριστικά των μονοηλεκτρονιακών κυματοσυναρτήσεων των ελευθέρων ατόμων, αλλά με κάποια αλλοίωση, που θα επιβάλει η αλληλεπικάλυψή τους κατά τη δημιουργία του χημικού δεσμού. Έτσι οι μονοηλεκτρονιακές κυματοσυναρτήσεις ενός συστήματος ατόμων θα μπορούν να γράφονται ως ένας γραμμικός συνδυασμός των ατομικών τροχιακών των ατόμων που απαρτίζουν το σύστημα, ο οποίος θα προκύπτει από τη διαγωνοποίηση μιας χαμιλτονιανής μήτρας. Σε πρακτικό επίπεδο, η προσέγγιση της ισχυρής δέσμευσης είναι χρήσιμη σε συστήματα όπου επιβάλλεται η περιγραφή του συστήματος με κβαντομηχανικούς όρους, στα οποία οι υπολογισμοί με μεθόδους πρώτων αρχών είναι πρακτικά αδύνατο να γίνουν, λόγω του υπολογιστικού χρόνου που απαιτείται. Από την…

Subjects/Keywords: Φουλερίνες ( Ενέργεια, Ισομερή); Νικέλιο; Συσσωματώματα; Μαγνητισμός, Μη συγγραμμικός; Μαγνητικές ιδιότητες; Θερμοκρασία τήξης; Θερμοκρασία Κιουρί; Μοριακή δυναμική; Προσέγγιση ισχυρής δέσμευσης; Fullerenes ( Energetics, Isomers); Nickel; Clusters; Non colinear magnetism; Magnetic properties; Curie and melting temperature; Molecular dynamics; Tight binding approximation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Φθενάκης, . �. (2010). Μελέτη δομικών, ηλεκτρονικών, θερμοδυναμικών και μαγνητικών ιδιοτήτων συσσωματωμάτων, με τη μέθοδο της μοριακής δυναμικής στην προσέγγιση της ισχυρής δέσμευσης. (Thesis). University of Crete (UOC); Πανεπιστήμιο Κρήτης. Retrieved from http://hdl.handle.net/10442/hedi/18893

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Φθενάκης, Ζαχαρίας. “Μελέτη δομικών, ηλεκτρονικών, θερμοδυναμικών και μαγνητικών ιδιοτήτων συσσωματωμάτων, με τη μέθοδο της μοριακής δυναμικής στην προσέγγιση της ισχυρής δέσμευσης.” 2010. Thesis, University of Crete (UOC); Πανεπιστήμιο Κρήτης. Accessed February 27, 2021. http://hdl.handle.net/10442/hedi/18893.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Φθενάκης, Ζαχαρίας. “Μελέτη δομικών, ηλεκτρονικών, θερμοδυναμικών και μαγνητικών ιδιοτήτων συσσωματωμάτων, με τη μέθοδο της μοριακής δυναμικής στην προσέγγιση της ισχυρής δέσμευσης.” 2010. Web. 27 Feb 2021.

Vancouver:

Φθενάκης �. Μελέτη δομικών, ηλεκτρονικών, θερμοδυναμικών και μαγνητικών ιδιοτήτων συσσωματωμάτων, με τη μέθοδο της μοριακής δυναμικής στην προσέγγιση της ισχυρής δέσμευσης. [Internet] [Thesis]. University of Crete (UOC); Πανεπιστήμιο Κρήτης; 2010. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10442/hedi/18893.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Φθενάκης �. Μελέτη δομικών, ηλεκτρονικών, θερμοδυναμικών και μαγνητικών ιδιοτήτων συσσωματωμάτων, με τη μέθοδο της μοριακής δυναμικής στην προσέγγιση της ισχυρής δέσμευσης. [Thesis]. University of Crete (UOC); Πανεπιστήμιο Κρήτης; 2010. Available from: http://hdl.handle.net/10442/hedi/18893

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

21. Cebrecos Ruiz, Alejandro. Transmission, reflection and absorption in Sonic and Phononic Crystals .

Degree: 2015, Universitat Politècnica de València

URL: http://hdl.handle.net/10251/56463

► [EN] Phononic crystals are artificial materials formed by a periodic arrangement of inclusions embedded into a host medium, where each of them can be solid… (more)

▼ [EN] Phononic crystals are artificial materials formed by a periodic arrangement of inclusions embedded into a host medium, where each of them can be solid or fluid. By controlling the geometry and the impedance contrast of its constituent materials, one can control the dispersive properties of waves, giving rise to a huge variety of interesting and fundamental phenomena in the context of wave propagation. When a propagating wave encounters a medium with different physical properties it can be transmitted and reflected in lossless media, but also absorbed if dissipation is taken into account. These fundamental phenomena have been classically explained in the context of homogeneous media, but it has been a subject of increasing interest in the context of periodic structures in recent years as well. This thesis is devoted to the study of different effects found in sonic and phononic crystals associated with transmission, reflection and absorption of waves, as well as the development of a technique for the characterization of its dispersive properties, described by the band structure. We start discussing the control of wave propagation in transmission in conservative systems. Specifically, our interest is to show how sonic crystals can modify the spatial dispersion of propagating waves leading to control the diffractive broadening of sound beams. Making use of the spatial dispersion curves extracted from the analysis of the band structure, we first predict zero and negative diffraction of waves at frequencies close to the band-edge, resulting in collimation and focusing of sound beams in and behind a 3D sonic crystal, and later demonstrate it through experimental measurements. The focusing efficiency of a 3D sonic crystal is limited due to the strong scattering inside the crystal, characteristic of the diffraction regime. To overcome this limitation we consider axisymmetric structures working in the long wavelength regime, as a gradient index lens. In this regime, the scattering is strongly reduced and, in an axisymmetric configuration, the symmetry matching with acoustic sources radiating sound beams increase its efficiency dramatically. Moreover, the homogenization theory can be used to model the structure as an effective medium with effective physical properties, allowing the study of the wave front profile in terms of refraction. We will show the model, design and characterization of an efficient focusing device based on these concepts. Consider now a periodic structure in which one of the parameters of the lattice, such as the lattice constant or the filling fraction, gradually changes along the propagation direction. Chirped crystals represent this concept and are used here to demonstrate a novel mechanism of sound wave enhancement based on a phenomenon known as "soft" reflection. The enhancement is related to a progressive slowing down of the wave as it propagates along the material, which is associated with the group velocity of the local dispersion relation at the planes of the crystal. A model based on the… Advisors/Committee Members: Picó Vila, Rubén (advisor), Sánchez Morcillo, Víctor José (advisor).

Subjects/Keywords: Periodic Structures; Sonic Crystals, Phononic Crystals; Transmission; Reflection, Absorption; Band Structure; Dispersion Relation; Focusing; Focalization; Collimation; Spatial dispersion; Beam; Acoustic Beam; Ultrasonic Beam; Axisymmetric; Symmetry Matching; Gradient Index; Lens; Lenses; Homogenization; Refraction; Refractive devices; Long-wavelength; Effective medium; Effective properties; Paraxial approximation; Isofrequency lines; Isofrequency contours; Wave vector; Chirped; Tappered; Rainbow trapping; Mirage effect; Chirped crystals; Wave Enhancement; Soft reflection; Group velocity; Slowing down; Coupled Mode Theory; CMT; Linear Chirped; Exponential chirped; Dissipation; Losses; Porous absorber; Porous material; Porous layers; Dissipative couple mode theory; Modulation; Loss modulation; Band structure calculation; Elastic waves; Acoustic waves; Time-marching; Algorithm; Bloch vector; Bloch boundary conditions; Boundary conditions; Unit cell; Vibrational modes; Resonant peaks; Resonant modes; Accuracy; Convergence; Computation time; Solid-Solid; Solid-fluid; Lamella cyrstal; Extraordinary absorption; Interaction strength; Time delay; Fourier Transform

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APA (6^th Edition):

Cebrecos Ruiz, A. (2015). Transmission, reflection and absorption in Sonic and Phononic Crystals . (Doctoral Dissertation). Universitat Politècnica de València. Retrieved from http://hdl.handle.net/10251/56463

Chicago Manual of Style (16^th Edition):

Cebrecos Ruiz, Alejandro. “Transmission, reflection and absorption in Sonic and Phononic Crystals .” 2015. Doctoral Dissertation, Universitat Politècnica de València. Accessed February 27, 2021. http://hdl.handle.net/10251/56463.

MLA Handbook (7^th Edition):

Cebrecos Ruiz, Alejandro. “Transmission, reflection and absorption in Sonic and Phononic Crystals .” 2015. Web. 27 Feb 2021.

Vancouver:

Cebrecos Ruiz A. Transmission, reflection and absorption in Sonic and Phononic Crystals . [Internet] [Doctoral dissertation]. Universitat Politècnica de València; 2015. [cited 2021 Feb 27]. Available from: http://hdl.handle.net/10251/56463.

Council of Science Editors:

Cebrecos Ruiz A. Transmission, reflection and absorption in Sonic and Phononic Crystals . [Doctoral Dissertation]. Universitat Politècnica de València; 2015. Available from: http://hdl.handle.net/10251/56463

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