To see the other types of publications on this topic, follow the link: SYM theories.
Dissertations / Theses on the topic 'SYM theories'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'SYM theories.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
RATTI, CARLOALBERTO. "Topics in sym theories: * Ads/CFT & Mesonic Spectra ** Superspace & Scattering Amplitudes." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2010. http://hdl.handle.net/10281/11607.
Full textAbstract:
In this thesis two different topics in SYM theories are investigated. In the first part we use the AdS/CFT correspondence to study the problem of flavor symmetry for theories that are marginal deformations of the maximal SYM theory. In particular, we compute exactly the masses of the mesons of these theories. The results show that the mass spectrum is discrete, with a mass gap and a Zeeman-like splitting of the mass levels occurs. In the second part of the thesis, we develop a direct computational technique for scattering amplitudes in SYM theories. A combined use of background field method, superspace technologies and new pc programs makes a Feynman diagrammatic approach available. We apply this technique to compute the full two-loop MHV effective action of the maximal SYM theory. From there we move towards the extraction of the four point MHV scattering amplitude.
2
Azevedo, Thales Agricola Calixto de [UNESP]. "De supergravidade em Ad'S IND. 5' X 'S POT. 5' a N = 4 SYM via superespaço harmônico." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/91843.
Full textAbstract:
Made available in DSpace on 2014-06-11T19:25:30Z (GMT). No. of bitstreams: 0
Previous issue date: 2011-03-11Bitstream added on 2014-06-13T19:32:38Z : No. of bitstreams: 1
azevedo_tac_me_ift.pdf: 373974 bytes, checksum: 6a2336bc24ee4aed68e9d75a6f8dc9d1 (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A correspondência AdS/CFT, da forma como foi conjecturada por Maldacena, sugere uma equivalência notável entre duas teorias aparentemente não relacionadas, quais sejam uma teoria de supercordas tipo IIB em um background AdS5 × S5 e uma teoria de super Yang–Mills (SYM) em quatro dimensões maximalmente supersimétrica(N = 4). Nesta dissertação, estudamos a relação entre o espectro da teoria de supergravidade tipo IIB em AdS5 × S5 (limite de baixas energias da teoria de supercordas mencionada acima) e a família de operadores invariantes degauge em N = 4 SYM descrita em [P. Howe, P. West, Int. J. Mod. Phys. A 14 (1999) 2659] através do uso de um superespaço harmônico, tendo como base principal o artigo [P. Heslop, P. Howe, Phys. Lett. B 502 (2001) 259]. Fazemos ainda uma revisão do formalismo de cosets, que é amplamente utilizado neste trabalho
The AdS/CFT correspondence, as conjectured by Maldacena, suggests a remarkable equivalence between two apparently unrelated theories, namely a type IIB superstring theory on an AdS5 ×S5 background and a maximally supersymmetric (N = 4) super Yang–Mills (SYM) theory in four dimensions. In this dissertation, we study the relation between the spectrum of the type IIB supergravity theory on AdS5 × S5 (low-energy limit of the superstring theory mentioned above) and the family of gauge-invariant operators inN = 4 SYM described in [P. Howe, P. West, Int. J. Mod. Phys. A 14 (1999) 2659] by making use of a harmonic superspace, mostly based on [P. Heslop, P. Howe, Phys. Lett.B502 (2001) 259]. Moreover, we review the coset space formalism, which is largely used in the present work
3
Azevedo, Thales Agricola Calixto de. "De supergravidade em Ad'S IND. 5' X 'S POT. 5' a N = 4 SYM via superespaço harmônico /." São Paulo : [s.n.], 2011. http://hdl.handle.net/11449/91843.
Full textAbstract:
Orientador: Nathan Jacob BerkovitsBanca: Andrei Mikhailov
Banca: Nelson Braga
Resumo: A correspondência AdS/CFT, da forma como foi conjecturada por Maldacena, sugere uma equivalência notável entre duas teorias aparentemente não relacionadas, quais sejam uma teoria de supercordas tipo IIB em um background AdS5 × S5 e uma teoria de super Yang-Mills (SYM) em quatro dimensões maximalmente supersimétrica(N = 4). Nesta dissertação, estudamos a relação entre o espectro da teoria de supergravidade tipo IIB em AdS5 × S5 (limite de baixas energias da teoria de supercordas mencionada acima) e a família de operadores invariantes degauge em N = 4 SYM descrita em [P. Howe, P. West, Int. J. Mod. Phys. A 14 (1999) 2659] através do uso de um superespaço harmônico, tendo como base principal o artigo [P. Heslop, P. Howe, Phys. Lett. B 502 (2001) 259]. Fazemos ainda uma revisão do formalismo de cosets, que é amplamente utilizado neste trabalho
Abstract: The AdS/CFT correspondence, as conjectured by Maldacena, suggests a remarkable equivalence between two apparently unrelated theories, namely a type IIB superstring theory on an AdS5 ×S5 background and a maximally supersymmetric (N = 4) super Yang-Mills (SYM) theory in four dimensions. In this dissertation, we study the relation between the spectrum of the type IIB supergravity theory on AdS5 × S5 (low-energy limit of the superstring theory mentioned above) and the family of gauge-invariant operators inN = 4 SYM described in [P. Howe, P. West, Int. J. Mod. Phys. A 14 (1999) 2659] by making use of a harmonic superspace, mostly based on [P. Heslop, P. Howe, Phys. Lett.B502 (2001) 259]. Moreover, we review the coset space formalism, which is largely used in the present work
Mestre
4
Martens, Betsy Van der Veer Goodrum Abby. "Theories at work Functional characteristics of theories that facilitate their diffusion over time /." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2004. http://wwwlib.umi.com/cr/syr/main.
Full text
5
Karamov, Sergey Alexandrovich Catterall Simon. "Supersymmetric theories on the lattice." Related Electronic Resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2003. http://wwwlib.umi.com/cr/syr/main.
Full text
6
Psomas, Patricia Noga. "Speech act theories of meaning." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2002. http://wwwlib.umi.com/cr/syr/main.
Full text
7
Ozarkar, Shailesh. "Numerical simulations and theories for wall-bounded flows of suspensions." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2008. http://wwwlib.umi.com/cr/syr/main.
Full text
8
Torres, Bernal Anibal. "Critical relational model a normative and meta-theoretical analysis of family therapy theories /." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2005. http://wwwlib.umi.com/cr/syr/main.
Full text
9
Loureiro, Bruno. "Disorder in holographic field theories : inhomogeneous geometries, momentum relaxation and SYK models." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/277911.
Full textAbstract:
Holographic dualities are now an established tool in the study of universal properties of strongly coupled field theories. Yet, theories without translational symmetry are still poorly understood in this context. In this dissertation, we investigate three new approaches to this challenging problem. The first part of the dissertation concerns a class of phenomenological holographic models in which momentum relaxation can be achieved without breaking translational symmetry in the dual geometry. In particular, we focus on an example in which the dual geometry is similar to anti-de Sitter (AdS) Brans-Dicke theory. We study the thermodynamic and transport properties of the model and show that for strong momentum relaxation and low temperatures the model has insulator-like behaviour. In the second part, we go beyond the effective description and consider holographic theories which explicitly break translational symmetry. From the perspective of gravity, these theories translate to geometries that vary explicitly in the boundary space-like coordinates. We refer to these geometries as 'inhomogeneous' and investigate two approaches to study them. The first is motivated by the question: "what happens to a homogeneous geometry when coupled with a field varying randomly in space?". Starting from an AdS geometry at zero or finite temperature, we show that a spatially varying random Maxwell potential drives the dual field theory to a non-trivial infra-red fixed point characterised by an emerging scale invariance. Thermodynamic and transport properties of this disordered ground state are also discussed. The second is motivated by the complementary question: "how does a random geometry affect a probe field?". In the weak disorder limit, we show that disorder induces an additional power-law decay in the dual correlation functions. For certain choices of geometry profile, this contribution becomes dominant in the infra-red, indicating the breaking of perturbation theory and the possible existence of a phase transition induced by disorder. The third and last part of this dissertation switches from the gravity to the field theoretical side of the duality. We discuss the Sachdev-Ye-Kitaev (SYK) model, a disordered many-body model with distinctive black hole-like properties. We provide analytical and numerical evidence that these holographic properties are robust against a natural one-body deformation for a finite range of parameters. Outside this interval, this system undergoes a chaotic-integrable transition.
10
Ohse, Dawn. "Applying the SCM and BIAS Map Models to Theories of Sexual Harassment." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/dissertations/920.
Full textAbstract:
Current theories of sexual harassment do not account for all instances of sexual harassment (e.g., not man enough harassment) or third party reactions to sexual harassment such as manager or coworker perceptions of sexual harassment or interactions with the target of sexual harassment. Perhaps taking a step back from specific sexual harassment theories and looking at more general theories of discriminatory behavior can provide some guidance toward a more overarching theory of sexual harassment. The current study applied the Stereotype Content Model (SCM; Fiske, Cuddy, Glick & Xu, 2002) and Behaviors from Intergroup Affect and Stereotypes (BIAS) Map model (Cuddy, Fiske & Glick, 2007) to women who are sexually harassed and the resulting third party behavioral reactions, including perception of sexual harassment. This study attempted to establish the initial relationships between the evaluation of the female target with regard to her competition and status to the other variables in the model: stereotyping (i.e., how observers think about the target - warmth and competence), prejudice (i.e., how observers feel about the target - pity, admiration, envy, contempt) and behavioral reactions (how observers act toward the target - active facilitation, passive facilitation, active harm, passive harm). Higher status targets were perceived as more competent than lower status targets. Competition did not have an effect on perceptions of the target's warmth. Competition and status did not predict emotions and behavioral reactions as hypothesized; however many other relationships predicted by the model between stereotypes, emotions, behavioral reactions and perceptions of sexual harassment were found here, although not hypothesized in the current study. Targets who were perceived as warm and competent elicited more facilitation and less harm than those who were perceived as less warm and less competent. Targets that were admired and pitied elicited more facilitation whereas targets that were contempted or envied elicited more harm. Additionally, warmth, competence, admiration, and pity were positively related to perceptions of sexual harassment, whereas envy and contempt were negatively related to perceptions of sexual harassment. Targets who were perceived as having been sexually harassed elicited more facilitation and less harm. Thus, the model is still useful in understanding how stereotypes (warmth and competence) and emotions (envy, admiration, pity, and contempt) relate to third party behavioral reactions to sexual harassment and perceptions of sexual harassment. Given that competition and status did not predict stereotypes, emotions, behavioral reactions and perceptions of sexual harassment as expected, it may be that these effects are more a function of individual factors such as gender and hostile sexism, rather than out-group evaluation (competition and status). In the current study men and those higher in hostile sexism were less likely than women and those lower in hostile sexism to perceive that the target had been sexually harassed, to perceive the target as warm and competent, to feel admiration or pity for the target, or to engage in facilitation behaviors. Additionally, men and those higher in hostile sexism were more likely than women and those lower in hostile sexism to feel contempt or envy toward the target and to engage in harm behaviors. Future research should examine other methods of manipulating perceptions of targets' competitiveness and status other than occupational characteristics to examine the impact of these out-group characteristics on stereotypes, emotions and behavioral reactions in the context of sexual harassment.
11
Jackson, Brian Scott Carney Laurel H. "Consequences of long-range temporal dependence in neural spiking activity for theories of processing and coding." Related Electronic Resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2003. http://wwwlib.umi.com/cr/syr/main.
Full text
12
Perone, Marco. "Direct sum decompositions and weak Krull-Schmidt Theorems." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3427427.
Full textAbstract:
In this thesis we discuss the behaviour of direct sum decomposition in additive categories and in particular in categories of modules.
In the first part of the thesis, we investigate the ring theoretical properties that play a main role in the theory of factorization in additive categories, like the exchange property, semilocality and Goldie dimension. We stress the importance of the latter and we investigate with care the infinite case of the dual Goldie dimension of rings.
In the rest of the thesis, we use a more categorical approach, studying the behaviour of direct sum decomposition in additive categories. Given an additive category C, its skeleton V(C) has the structure of a commutative monoid under the operation of direct sum, and all the information about the regularity of the direct sum decomposition in the category C are traceable from the monoid V(C). We study classes of categories where the direct sum decomposition behaves quite regularly; mainly we restrict to categories C whose monoid V(C) is a Krull monoid, underlining the prominent role played by semilocal endomorphism rings. We analyze the peculiar behaviour of direct sum decomposition in some categories of modules, where the uniqueness of the decomposition is obtained up to two permutations, and we notice how this phenomenon is due to the presence of endomorphism rings of type two. In the last chapter we investigate what happens when we pass from finite direct sum of indecomposable objects to infinite direct sums, and we develop the setting for the phenomena we studied in the finite case to appear, both at a monoid theoretical and at a categorical level.In questa tesi discutiamo il comportamento della decomposizione in somma diretta in categorie additive e in particolare in categorie di moduli. Nella prima parte della tesi, investighiamo le proprietà degli anelli che giocano un ruolo prominente nella teoria della fattorizzazione nelle categorie additive, come per esempio la proprietà di scambio, la semilocalità e la dimensione di Goldie. Vogliamo sottolineare l'importanza di quest'ultima e investighiamo con attenzione il caso infinito della dimensione duale di Goldie di un anello. Nel resto della tesi, utilizziamo un approccio più categoriale, studiando il comportamento della decomposizione in somma diretta nelle categorie additive. Data una categoria additiva C, il suo scheletro V(C) ha la struttura di un monoide commutativo rispetto all'operazione di somma diretta, e tutte le informazioni riguardo la regolarità della decomposizione in somma diretta nella categoria C sono rintracciabili attraverso il monoide V(C). Studiamo classi di categorie in cui la decomposizione in somma diretta assume un comportamento abbastanza regolare; principalemente ci restringiamo a categorie C il cui monoide V(C) è un monoide di Krull, evidenziando il ruolo prominente occupato da parte degli anelli degli endomorfismi semilocali. Analizziamo il comportamento peculiare della decomposizione in somma diretta in alcune categorie di moduli, dove l'unicità della decomposizione è garantita a meno di due permutazioni, e notiamo come questo fenomeno sia dovuto alla presenza di anelli degli endomorfismi di tipo due. Nell'ultimo capitolo investighiamo cosa succede quando passiamo da somme dirette finite di oggetti indecomponibili a somme dirette infinite, e sviluppiamo l'ambiente in cui i fenomeni studiati precedentemente nel caso finito si manifestano, sia ad un livello di teoria dei monodi sia ad un livello categoriale.
13
Szegedy, Lorant [Verfasser], and Ingo [Akademischer Betreuer] Runkel. "State-sum construction of two-dimensional functorial field theories / Lorant Szegedy ; Betreuer: Ingo Runkel." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2018. http://d-nb.info/1168380936/34.
Full text
14
Josefsson, Therese, and Isabell Fröberg. "Strategier för att befästa och vidga elevens ordförråd : Om uppgiftsuppläggets teoretiska förankring i ett läromedel som används i svenska som andraspråk." Thesis, Linnéuniversitetet, Institutionen för svenska språket (SV), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-53881.
Full textAbstract:
This study analyses the textbook Veckans ord 5 by Britta Redin and Görel Hydén (2003), which is used as a teaching aid in Swedish as a second language. The aim is to examine the theories of vocabulary learning and the learning strategies revealed in the content and design of the textbook and thereby examine its functionality for Swedish L2 pupils. We use content analysis as a method and apply it to selected chapters in the book connected to vocabulary learning and how pupils are expected to consolidate the words they learn. The analysis also considers whether the exercises deal with the form of words (morphology, orthography, phonology) or their content (syntax, lexical field, synonyms, hyponyms, antonyms). The result shows that the arrangement of the textbook agrees with some common theories and vocabulary learning strategies such as repeating words, linking them to synonyms and learning words through pictures. Another finding is that the exercises highlight the form of words more than their content and meaning.
15
Axgart, Robert, and Adam Hellman. "Redovisningsval : en studie om faktorer som påverkar bostadsrättsföreningars val av regelverk." Thesis, Högskolan Kristianstad, Sektionen för hälsa och samhälle, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-12280.
Full textAbstract:
I början av 2014 infördes ett nytt regelverk för hur företag och ekonomiska föreningar ska avsluta sina räkenskapsår. Inte förrän media började rapportera om problemet tidigare i år har diskussionen satts igång och flera organisationer har gjort uttalande och förenklingar. De har visat sig vara svåra att tolka och implementera och för en del bostadsrättsföreningar kan tillämpningen vara ödesdiger. Valet står mellan två regelverk i det så kallade K-projektet.Syftet med studien är att utifrån bostadsrättsföreningarnas perspektiv utforska vilka faktorer som påverkar och hur de påverkas beroende av redovisningsvalet styrelsen gör. Detta kommer utföras genom att studera ekonomiska förvaltare som förser föreningarna med rekommendationer och information. Studiens problemformulering är därför vilka faktorer påverkar föreningarnas val av regelverk.Studien kommer utgå från ett abduktivt resonemang vilket är väsentligt för en explorativ studie. Tillsammans med teorier om rationella beslut, principal-agent förhållande, intressenter och risk, kommer vi att skapa en förståelse för hur föreningar fattar beslut. För att uppnå detta mål och få en bra helhetsbild kommer vi att utgå från kvalitativa undersökningar med semi-strukturerade intervjuer. För att styrka studiens tillförlitlighet utgick vi ifrån tillförlitliga metoder som är en central del för en god forskning. Vi har varit konsekventa och opartiska där vi utgick från samma material vid samtliga intervjuer för att forskningsfrågan ska anses korrekt framförd.Genom att analysera empirin har vi kunnat skapa exempel på möjliga scenario i resultaträkningar för att enklare kunna göra kopplingar till teorin. Resultatet av studien konstaterade att det är flera faktorer som påverkar valet som styrelsen gör. Det visade sig att styrelsen är beroende av information utifrån och att det finns flera intressenter som har ett egenintresse i valet.In early 2014 introduced a new framework for how companies and economic associations must end their fiscal year. Not until the media began to report on the issue earlier this year, the debate has been launched and several organizations have made statements and simplifications. They have proven to be difficult to interpret and implement, and for some housing associations, the application may be fatal. The choice is between two sets of rules in the K-project. Depending on the choice that the Board make, the consequences of the different choices differ markedly.The purpose of the study is that the basis of condominium associations' perspective, exploring the factors that influence and how they are affected, depends on the accounting elections board does. This will be carried out by studying financial managers that provide boards with information and recommendations. The problem of the study is therefore what factors affect board election of the regulations.The study will be based on an abductive reasoning which is essential for an exploratory study. Along with theories of rational decisions, the principal- agent relationship, stakeholders and risk, we will create an understanding of how associations make decisions. To achieve this goal and get a good overall picture, we will start from qualitative research with semi-structured interviews. In order to prove the reliability of the study, we started from reliable methods that are a central part of good research. We have been consistent and impartial where we started from the same material at all interviews, to research the matter shall be correctly performed.By analyzing empirical data, we have been able to create examples of possible scenarios in the financial statements for easier linkage to theory. Results of the study found that there are several factors affecting the choice that the board does. It turned out that the Board is dependent on information from outside and that there are multiple stakeholders who have a vested interest in the election.
16
Axgart, Robert, and Adam Hellman. "Redovisningsval : en studie om faktorer som påverkar valet och dess konsekvenser." Thesis, Högskolan Kristianstad, Sektionen för hälsa och samhälle, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hkr:diva-12422.
Full textAbstract:
I början av 2014 infördes ett nytt regelverk för hur företag och ekonomiska föreningar ska avsluta sina räkenskapsår. Inte förrän media började rapportera om problemet tidigare i år har diskussionen satts igång och flera organisationer har gjort uttalande och förenklingar. De har visat sig vara svåra att tolka och implementera och för en del bostadsrättsföreningar kan tillämpningen vara ödesdiger. Valet står mellan två regelverk i det så kallade K-projektet. Syftet med studien är att utifrån bostadsrättsföreningarnas perspektiv utforska vilka faktorer som påverkar och hur de påverkas beroende av redovisningsvalet styrelsen gör. Detta kommer utföras genom att studera ekonomiska förvaltare som förser föreningarna med rekommendationer och information. Studiens problemformulering är därför vilka faktorer påverkar föreningarnas val av regelverk. Studien kommer utgå från ett abduktivt resonemang vilket är väsentligt för en explorativ studie. Tillsammans med teorier om rationella beslut, principal-agent förhållande, intressenter och risk, kommer vi att skapa en förståelse för hur föreningar fattar beslut. För att uppnå detta mål och få en bra helhetsbild kommer vi att utgå från kvalitativa undersökningar med semi-strukturerade intervjuer. För att styrka studiens tillförlitlighet utgick vi ifrån tillförlitliga metoder som är en central del för en god forskning. Vi har varit konsekventa och opartiska där vi utgick från samma material vid samtliga intervjuer för att forskningsfrågan ska anses korrekt framförd. Genom att analysera empirin har vi kunnat skapa exempel på möjliga scenario i resultaträkningar för att enklare kunna göra kopplingar till teorin. Resultatet av studien konstaterade att det är flera faktorer som påverkar valet som styrelsen gör. Det visade sig att styrelsen är beroende av information utifrån och att det finns flera intressenter som har ett egenintresse i valet.In early 2014 introduced a new framework for how companies and economic associations must end their fiscal year. Not until the media began to report on the issue earlier this year, the debate has been launched and several organizations have made statements and simplifications. They have proven to be difficult to interpret and implement, and for some housing associations, the application may be fatal. The choice is between two sets of rules in the K-project. Depending on the choice that the Board make, the consequences of the different choices differ markedly. The purpose of the study is that the basis of condominium associations' perspective, exploring the factors that influence and how they are affected, depends on the accounting elections board does. This will be carried out by studying financial managers that provide boards with information and recommendations. The problem of the study is therefore what factors affect board election of the regulations. The study will be based on an abductive reasoning which is essential for an exploratory study. Along with theories of rational decisions, the principal- agent relationship, stakeholders and risk, we will create an understanding of how associations make decisions. To achieve this goal and get a good overall picture, we will start from qualitative research with semi-structured interviews. In order to prove the reliability of the study, we started from reliable methods that are a central part of good research. We have been consistent and impartial where we started from the same material at all interviews, to research the matter shall be correctly performed. By analyzing empirical data, we have been able to create examples of possible scenarios in the financial statements for easier linkage to theory. Results of the study found that there are several factors affecting the choice that the board does. It turned out that the Board is dependent on information from outside and that there are multiple stakeholders who have a vested interest in the election.
17
Campanini, Federico. "Weak forms of the Krull-Schmidt theorem and Prüfer rings in distinguished constructions." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3422693.
Full textAbstract:
This thesis is divided in two chapters.
The first one concerns direct-sum decompositions in additive categories. It is well known that if a module admits a direct-sum decomposition into indecomposable modules with local endomorphism rings, then this decomposition is essentially unique, up to isomorphism and a permutation of the direct summands. However, there are situations in which direct-sum decompositions into indecomposable modules are not essentially unique. Among these cases, particularly interesting are those in which it is possible to find some kind of regularity: direct-sum decompositions can be described via two invariants up to two permutations. Such behaviour was firstly discovered for uniserial modules by A. Facchini in 1996, and it was subsequently investigated for several other classes of modules, such as cyclically presented modules over a local ring, couniformly presented modules and kernels of morphisms between indecomposable injective modules.
In this thesis, we provide examples of additive categories in which direct-sum decompositions can be classified via finitely many invariants. It is worth noting that, in our constructions, we treat cases in which the number of invariants needed to describe finite direct-sum decompositions can be arbitrarily large.
The second chapter is devoted to the study of Prufer (commutative) rings with zero-divisors. We investigate the so-called "Prufer-like conditions" in several constructions, most of them related to pullbacks. It is well known that fiber products provide a rich source of examples and counterexamples in Commutative Algebra, because of their ability of producing rings with certain predetermined properties. Our investigation moves from very natural settings, for example those of regular conductor squares, up to more technical constructions, such as bi-amalgamated algebras, introduced by Kabbaj, Louartiti and Tamekkante in 2017 as a generalization of that of amalgamated algebras. Our main results in the pullback framework cover several different situations studied up to now by Bakkaki and Mahdou, Boynton, Houston and Taylor.
We also investigate Prufer ring from other points of view. We introduce the notion of regular morphism and we prove that if a ring R is the homomorphic image of a Prufer ring via a regular morphism, then R is Prufer. Finally, we turn our attention to the ideal-theory of pre-Prufer rings, proving a number of generalizations of some results of Boisen and Larsen.
18
Richardson, Robert. "On the Number of Integers Expressible as the Sum of Two Squares." Connect to resource online, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1265123768.
Full text
19
Fagge, Geoffrey. "Demonisk besatthet och exorcism. : En komparativ studie av två böcker som tar upp Klingenberg caset." Thesis, Umeå universitet, Institutionen för idé- och samhällsstudier, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-126138.
Full textAbstract:
This study examines how two writers deal with demonic possession and exorcism in their written works that both have a common theme, the same alleged case of possession and exorcism. By comparing these written works I explore if the authors share any common or varying theories on possession and exorcism and investigate if the common theme of the two books has contributed to the authors writing similar books.My results show that the two authors deal with demonic possession and exorcism differently, one has theological views of the phenomena but is sceptical of their role in the alleged case, whilst the other believes that demonic possession and exorcism can be explained using scientific theories and that they are phenomena that played a part in the alleged case. The two books are quite different. I conclude that both writers’ theories of the phenomena are dependent on the existence of the phenomenon of religion.
20
Raask, Nathalie, and Jenny Törnblad. "Socialsekreterares agerande gentemot ungdomar med ”problemskapande beteende" : En kvalitativ studie av hur användandet av BBIC upplevs och vilka beteenden som anses skapa problem." Thesis, Linnéuniversitetet, Institutionen för socialt arbete (SA), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-35343.
Full textAbstract:
The aim of this study is to examine what social workers consider as ‘challenging behaviour’ among adolescents, but also to examine the connection between investigation and intervention in cases where such behaviour is being displayed. The questions of the study are to examine what social workers think of the instrument of assessment BBIC (Children’s Needs in Focus) and how the usage of BBIC affect social workers understanding of challenging behaviour. Moreover, it is a qualitative study and the respondents are all social workers with various length of professional experience who work with making decisions in juvenile welfare cases. The social workers’ opinion about which behaviours among adolescents that were important to intervene in could be understood with what was considered as moral panic for some behaviour. The social workers use of and opinion towards BBIC could be understood in relation to practical theory, tacit knowledge and naïve theories.
21
Vinet, Maud. "Etude par stm de nanostructures supraconductrices par proximite." Université Joseph Fourier (Grenoble), 2001. http://www.theses.fr/2001GRE10047.
Full textAbstract:
Cette these a ete motivee par le desir d'etudier l'effet de proximite entre un metal normal (n) et un supraconducteur (s). Pour cela, nous avons construit un microscope a effet tunnel (stm) pour mesurer la densite d'etats electroniques locale d'un metal. Celui-ci fonctionne a 100 mk dans un cryostat a dilution renverse. Pour respecter la philosophie de ce cryostat original, le stm est thermalise par contacts mecaniques sur la boite de melange sans gaz d'echange. Avant de coupler le stm a la dilution, nous avons procede a une mise au point prealable dans un cryostat a 4he a des temperatures comprises entre 4,2 k et 1,5 k. Nous avons donc etudie l'effet de proximite entre de l'or (n) en bon contact electrique avec du niobium (s) a 1,5 k. La reflexion d'andreev est le mecanisme microscopique qui regit cet effet de proximite. Elle permet a electron incident d'energie au dessus du niveau de fermi qui arrive sur une interface avec un supraconducteur d'etre retro-reflechit en un trou d'energie -. La paire electron-trou correles ainsi creee dans le metal normal se propage de maniere coherente sur une distance l hd/. Ces correlations conduisent a un affaiblissement de la densite d'etats a une particule dans le metal normal. Lorsque l'or est de taille infinie, 1 m dans notre cas, nous observons un affaiblissement de la densite d'etats electroniques locale dont l'extension spectrale diminue lorsque l'on s'eloigne de l'interface. Physiquement, c'est une manifestation de la longueur l. Les spectres mesures sont quantitativement expliques par le formalisme quasi-classique de l'equation d'usadel. Lorsque l'or est en contact avec le niobium est de faibles dimensions, quelques dizaines de nanometres, la densite d'etats montre un minigap
22
Sbosny, Hartmut. "Berechnung von STM-Profilkurven und von Quantenbillards endlicher Wandhoehe." [S.l. : s.n.], 1996. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10324496.
Full text
23
MAURI, ANDREA. "On marginal deformations of N = 4 super Yang–Mills theory." Doctoral thesis, Universita' degli Studi di Milano, 2008. http://hdl.handle.net/10281/125449.
Full textAbstract:
In this Thesis I analyze some aspects of a class of quantum field theories that can be obtained by marginally deforming N=4 SYM theory. These theories constitue a very non trivial example of N=1 superconformal actions in four dimensional space-time and play a role in the context of AdS/CFT. I begin by introducing superfield notations and constructing deformed theories following Leigh and Strassler procedure. Then an analysis of the finiteness properties of the actions is performed. Considering different specific cases, solutions of the superconformal constraint are given. The issues of conformal invariance and finiteness in the case of complex and real beta-deformed models are addressed. In the real beta case an all loop solution of the constraint is provided. In the case of complex deformation, it turns out that the condition of vanishing beta function leads to a result which is scheme dependent. In the second part of the work, anomalous dimensions of composite operators are computed. A new method for extracting protected operators in the chiral sector is introduced. Using the proposed procedure it is possible to gain a loop order in perturbative computations with respect to canonical methods. The structure of the chiral ring of the deformed theories is then classified up to three loops.
24
Franc, Karolina. "Vårdanställdas efterlevnad av informationssäkerhetspolicys : faktorer som påverkar efterlevnaden." Thesis, Linköpings universitet, Informatik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-111402.
Full textAbstract:
Informationssäkerhet är ett område som kommit att sättas alltmer i fokus hos organisationer. Tidigare har främst tekniska lösningar för att skydda viktig information fått uppmärksamhet, det är först på senare tid som informationssäkerhet har börjat uppfattas som ett komplext område som innefattar såväl tekniska, som organisatoriska och mänskliga faktorer. För att eftersträva en god informationssäkerhet inom organisationen bör ett grundligt arbete läggas på att utveckla informationssäkerhetspolicys och säkerhetsansvariga måste kontinuerligt utbilda och skapa medvetenhet hos anställda kring vilka hot som finns mot organisationen ifall informationssäkerhetsbestämmelser inte efterlevs. Huvudsyftet i föreliggande studie har varit att undersöka vilka faktorer som styr anställdas efterlevnad av informationssäkerhetspolicys. Ytterligare delsyfte har varit att undersöka hur den faktiska efterlevnaden av informationssäkerhetsbestämmelser avspeglar sig inom två vårdverksamheter i Landstinget i Östergötland. För att uppfylla studiens syfte har fallstudier genomförts där såväl observationer som intervjuer med personal legat till grund för datainsamlingen. Resultatet visar att säkerhetsmedvetandet och efterlevnaden av säkerhetsbestämmelser inom de undersökta organisationerna är tämligen god, men det finns skillnader i graden av efterlevnad. Resultaten visar att anställda i viss mån hoppar över säkerhetsbestämmelser för att effektivisera sitt arbete. Den vanligaste säkerhetsbestämmelsen som visade på bristande efterlevnad var att en del anställda slarvade med att logga ut eller låsa datorn då denna lämnades oövervakad. Faktorer som visat sig vara avgörande för ifall säkerhetsbestämmelser efterlevs eller inte är bland annat ifall den anställde anser att beteendet övervakas, hur väl medveten man är kring konsekvensen av att säkerhetsbestämmelser inte efterlevs, samt hur stor sannolikhet man anser det vara att hotet realiseras. Ytterligare faktorer som visat sig spela roll är ifall den anställde anser att säkerhetsbestämmelsen ligger i konflikt med andra intressen, såsom effektivitet eller bekvämlighet. För att kunna införa effektiva policyåtgärder krävs det därmed att policyutvecklare förstår vad som motiverar anställda till att följa säkerhetsbestämmelser och vilka värderingar som ligger bakom deras beteende.Information security has grown into a field of study that has gained increasingly attention within organizations. In the early days focus of the field has primerly been on technical solutions in order to protect information. Only recently information security has come to be seen as a complex area including both technical, organizational and human factors. In order to strive for a high degree of information security within the organization, emphasis has to be placed on developing a functional information security policy. Just as important is that security managers continually educate and create awareness amongst employees with regards to existing threats if information security rules are not respected. The main purpose in regards to this study has been to investigate the determinants of employees' compliance with information security policies. A further aim of the study has been to examine how the actual compliance of information security regulations is reflected in two healthcare clinics in the county council of Östergötland. In order to fulfill the purpose of the study, case studies were carried out in the clinics, where both filed studies and interviews with staff members formed the basis for data collection. The results show that security awareness and compliance with safety regulations within the surveyed organizations are fairly good, but there are differences in the level of compliance. The results show that employees to some degree overlook safety rules in order to make their work more efficient. The most common security rule that showed non-compliance was where employees occasionally did not logg off or lock the computer as it was left unattended. Determinants that showed to have an influence on whether or not employees comply with information security policys are among other factors to what extent the employee belives that the behavior is being monitored, awareness about conseqences from not complying with the security rules, as well as to what extent one belives that the actual threat occurs. Additional determinants that were found to have an influence on the actual behavior with regards to compliance is to what extent the employee considers the regulations to be in conflict with other interests, such as efficiency or convenience. In order to introduce effective policy measures knowledge is needed where policy makers understand what motivates employees to comply with safety rules, as well as the values that underlie their behavior.
25
Kasparavičiūtė, Aurelija. "Theorems of large deviations for the sums of a random number of independent random variables." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140121_101308-41106.
Full textAbstract:
The research object of this thesis is the sum of a random number of summands of independent identically distributed random variables with positive weights. Such sums appear as models, for example, in insurance, finance mathematics. Throughout the thesis, it is assumed that the random number of summands is independent of the summands, the summands satisfy S. N. Bernstein's condition, and the random number of summands together with weights satisfy some compatibility conditions. The aim of this dissertation is a normal approximation to a distribution of the sum of a random number of summands of independent identically distributed random variables with positive weights that takes into consideration large deviations in both the Cramer and the power Linnik zones.Disertacinio darbo tyrimo objektas yra atsitiktinio dėmenų skaičiaus nepriklausomų vienodai pasiskirsčiusių atsitiktinių dydžių su teigiamais svoriniais koeficientais sumos, kurios kaip modelis sutinkamos, pavyzdžiui, finansų, draudos matematikose. Daromos prielaidos, kad atsitiktinis dėmenų skaičius yra nepriklausomas nuo sumos dėmenų, atsitiktiniai dėmenys tenkina apibendrintą S. N. Bernšteino sąlygą, o atsitiktinis dėmenų skaičius kartu su svoriais tenkina tam tikras suderinamumo sąlygas. Disertacijos tikslas yra standartizuotos (centruotos ir normuotos) minėtos atsitiktinės sumos skirstinio aproksimacija standartiniu normaliuoju dėsniu didžiųjų nuokrypių tiek Kramero, tiek ir laipsninėse Liniko zonose.
26
Olsson, Hanna, and Filippa Blixt. ""Det är ju vår verktygslåda, alla metoder och teorier" : Om familjebehandlares upplevelse av kunskap, teorier och metoder i behandling av mammor som använder våld mot sina barn." Thesis, Hälsohögskolan, Högskolan i Jönköping, HHJ, Avd. för beteendevetenskap och socialt arbete, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-30931.
Full textAbstract:
The aim of this study is to investigate family therapists understanding of knowledge, theories and methods in the treatment of mothers who use violence against their children. The study is made on the basis that the operation is not based on clear evidence-based knowledge and examines how family therapists understand and combines existing methods and theories in social work. Methodically the study is based on qualitative interviews with five family therapists in different municipalities in the south of Sweden. A compilation of the interviews gave rise to two main themes: Mothers and violence respective Treatment. The result shows that there are not always explicit methods and theories available in the treatment of violent mothers. Despite this, the family therapists shows a large degree of consensus regarding methods and theories. In the discussion it is suggested that this may be due to some theories and methods are so integrated in the environments that the family therapists are active in that they do not specifically reflect on them. They have, in short, become routine.Syftet med denna studie är att undersöka familjebehandlares förståelse av kunskaper, teorier och metoder i behandlingen av mammor som använder våld mot sina barn. Studien görs mot bakgrund av att verksamheten inte bygger på tydliga evidensbaserade kunskaper och undersöker hur familjebehandlare, mot denna bakgrund, förstår och kombinerar i socialt arbete befintliga metoder och teorier. Metodiskt bygger studien på kvalitativa intervjuer med fem familjebehandlare i olika kommuner i södra Sverige. En sammanställning av intervjuerna gav upphov till två huvudteman: Mammor och våld respektive Behandling. Resultatet visar att det inte alltid finns uttalade metoder och teorier att tillgå i behandling av våldsutövande mammor. Trots detta uppvisar familjebehandlarna en relativt stor samstämmighet kring metoder och teorier. I diskussionen föreslås att detta kan bero på att vissa teorier och metoder är så integrerade i de miljöer familjebehandlarna är verksamma att de inte längre uttrycklig reflekterar över dem. De har, kort sagt, blivit rutin.
27
Lundblad, Therese, and Rebecca Stefansson. "Bräckt vatten smakar som tårar : En studie baserad på upplevelser inom Socialförvaltningen i Halmstads kommun beträffande hedersrelaterat våld och förtryck." Thesis, Högskolan i Halmstad, Sektionen för hälsa och samhälle (HOS), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-16376.
Full textAbstract:
Bräckt vatten smakar som tårar – En studie baserad på upplevelser inom Socialförvaltningen i Halmstad kommun beträffande hedersrelaterat våld och förtryck. Syftet med studien är att undersöka hur Socialförvaltningen i Halmstad arbetar med hedersfrågor. Vi vill fånga de olika aktörernas upplevelse och förståelse av fenomenet hedersrelaterat våld och förtryck. Studien är baserad på en kvalitativ metod med semistrukturerade intervjuer och resultatet är analyserat med hjälp utav teorierna Intersektionalitet, Postkolonial teori och den Mångkulturella triaden. Resultaten visar på att det finns en ambivalens kring hur intervjupersonerna väljer att definiera hedersrelaterat våld och förtryck och att detta dels bygger på att de är präglade av postkoloniala tankar om ”Den Andre” och dels att de i större utsträckning anammat ett intersektionellt tänkande genom vilket man förstår fenomenet hedersrelaterat våld och förtryck ur variabler såsom kön, klass och etnicitet. Inom Socialförvaltningen i Halmstad urskiljs inte ”hedersrelaterat våld” som en egen kategori från ”våld i nära relationer”. Vilket också visar på att de inte vill kategorisera våldet samtidigt som man talar om att det är mer komplext till sin natur än ”våld i nära relationer”. I skrivande stund finns ingen klar handlingsplan för hur man skall arbeta med hedersproblematiken vilket innebär att intervjupersonerna är hänvisade till sina egna erfarenheter, kunskaper och förståelse om vad hedersrelaterat våld och förtryck är.Brackish water tasting like tears - A study based on the Social Service´s experience of violence relating to honour codes in Halmstad municipal. The purpose of this study is to examine how Social Service authority in Halmstad works with honour-related issues. We intend on one hand to capture the different actors’ experience and their understanding of the phenomenon of honour and on the other hand investigating if there are any action plans regarding it. Qualitative research is used to gain insight into in the studied topic. We used semi-structured interviews as a data collecting method. The outcomes are then analysed using the theory of intersectionality, postcolonial theories and multicultural triad. The results shows that there is a ambivalence standpoints in how the people interviewed chose to define honor-related violence and oppression, and that this partly is based on that they are characterized of postcolonial thoughts about "the other" and also that they in a greater extent has accepted a intersectionality where they see the honor-related violence and oppression phenomena through variables like gender, class and ethnicity. Within Halmstad Social Services authorities, "honor-related violence" is not discerned and falls in to the same category as "violence within close relations". This (also) shows that they don’t wish to categorizes the violence but that they at the same time says that it's more complex than "violence in close relations". There is no clear plan of action at this point on how to work with the honor-related violence which means that respondents rely on their own experiences, knowledge and understanding about what violence and oppression is.
28
Kallova, Stina, and Sofie Tholander. "Att enas som grupp kring gemensamma mål : En studie om en personalgrupps samstämmighet gällande teorier och metoder inom institutionsvård för ungdomar." Thesis, Örebro universitet, Institutionen för juridik, psykologi och socialt arbete, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-33158.
Full textAbstract:
Inom institutionsvård för ungdomar har det visat sig finnas flera faktorer som är avgörande för ett positivt behandlingsresultat. En av dessa är personalgruppens samstämmighet. I föreliggande studie har syftet varit att undersöka vilka teorier och metoder som finns och tillämpas på HVB-hemmet Multigruppen, om det finns en förtrogenhet om, samt samstämmighet kring dessa hos personalgruppen, samt på vilket sätt ledarskapet på verksamheten bedrivs och om strategier för att främja en samstämmighet finns. Studien har en kvantitativ och kvalitativ metodansats. En enkätundersökning med verksamhetens personalgrupp och fem stycken intervjuer genomfördes. Intervjuerna genomfördes med tre anställda ur personalgruppen och två ur ledningen. Studiens resultat visar att det råder vissa brister kring det praktiska tillämpandet av verksamhetens teorier och metoder. Studien visar också att personalgruppen har en del svårigheter med att upprätthålla ett gemensamt förhållningssätt – trots detta anser de flesta att de arbetar mot gemensamma mål. Ledarskapet som bedrivs på Multigruppen är i stort lyhörda mot sin personal, ställer krav och ger positiv feedback. Trots detta visar studien att majoriteten av personalgruppen inte är trygga med den ledning som finns. I studien diskuteras bland annat vad som kan tänkas vara de bidragande orsakerna till det resultat som framkommit samt studiens svagheter och styrkor.Within institutional care for at-risk youth it has been shown that several factors are crucial for a positive outcome. One of these factors is the unanimity of the staff. In the present study, the aim has been to examine the theories and methods practiced at Multigruppen, an institution for at-risk youth. The study looks at the staffs’ familiarity as well as consensus with these theories and methods, the leadership system and the leaderships’ strategies to promote a consensus. The study was based on quantitative and qualitative methods. A survey and five interviews with staff members were conducted, two of which were in leadership roles. The results show inconsistencies between the theoretical and the in fact practiced methods in the treatment process. The study also shows that the staff have difficulty maintaining a common approach, however that most believe they are working toward common goals despite this. The leadership at Multigruppen is generally receptive of staff input and gives positive feedback as demanding high standards. Despite this, the study shows that the majority of the staff group have insecurities in regards to the leaderships’ capability. The study includes a discussion of possible contributing factors to the results obtained as well as the study’s’ strengths and weaknesses.
29
Kas, Elias Salma. "Vems behov kommer först? : En vetenskaplig essä om vilka elevers behov som ska prioriteras, samt hur omgivning, föräldrar och skolans resursfördelning spelar in." Thesis, Södertörns högskola, Lärarutbildningen, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-43578.
Full textAbstract:
“Whose needs come first?” is a scientific essay based on a self-experienced story about astudent in difficulties in school. It leads us to a dilemma about which students me as a youthworker in school and the after-school center should prioritize – a child in difficulties who is inneed of a lot of extra help and support but who also is very disturbing to others, or the rest ofthe students. The purpose of this scientific essay is to investigate who you judiciously shouldact towards the individual student and towards the whole class. Furthermore, the purpose isalso to examine how the schools' resources are generally distributed in school, how they aredistributed to children in need, which effect a diagnosis on a child could have on theallocation of resources, and how the parents' involvement could influence these decisions. The methods used to write the scientific essay are both the essay-writing itself, and also withrelevant literature present information from previous research, which connects to the purposeand the question formulations which are based on the purpose. Then, via a discussion andreflection highlight both the relevant and applicable on the self-experienced story, but alsocriticize the literature, because it is not often as applicable in the school’s reality as it soundseasy in the literature. Ethical and moral discussions are also an important aspect of the essay. This essay illuminates the difficulties of putting all the situations and all the students underthe same roof facing a dilemma, and that a lot of different factors could influence the outcomeof the situation, such as the environment, socioeconomic factors, background, culturalpreferences, and allocation of resources.”Vems behov kommer först?” är en vetenskaplig essä med utgångspunkt i en berättelse om enelev i svårigheter. Den leder oss fram till ett dilemma som handlar om vilka elever jag som fritidshemslärare i klassrummet och på fritidshemmet ska prioritera – ett barn i svårigheter som är i behov av mycket extra hjälp och stöd men som även stör klassen, eller resten aveleverna? Essäns syfte är att undersöka hur man omdömesfullt agerar gentemot den enskilda eleven och gentemot hela klassen. Syftet är även att undersöka hur skolans resurser fördelas generellt samt till barn i behov av extra stöd, och vilken påverkan en diagnos kan ha på resursfördelningen, samt hur föräldrarnas delaktighet i dessa beslut kan påverka. Metoden som använts till essäskrivandet är, förutom essäskrivandet i sig, att med relevant litteratur presentera information från tidigare forskning kopplat till syftet och frågeställningarna, vilka är baserade på syftet, och sedan med hjälp av diskussion och reflektion lyfta fram både det relevanta och tillämpbara på berättelsen, men även kritiseralitteraturen då det inte är lika tillämpbart i verkligheten i skolan som de får det att låta i teorin. Etik och moral är även en viktig aspekt som tas upp och diskuteras. Denna essä belyser svårigheterna med att dra alla situationer och elever över samma kam – att bland annat omgivning, socioekonomi, bakgrund, kultur och resursfördelning kan ha stor påverkan på situationers utfall.
30
He, Weikun. "Sommes, produits et projections des ensembles discrétisés." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS335/document.
Full textAbstract:
Dans le cadre discrétisé, la taille d'un ensemble à l'échelle δ est évaluée par son nombre de recouvrement par δ-boules (également connu sous le nom de l'entropie métrique). Dans cette thèse, nous étudions les propriétés combinatoires des ensembles discrétisés sous l'addition, la multiplication et les projections orthogonales. Il y a trois parties principales. Premièrement, nous démontrons un théorème somme-produit dans les algèbres de matrices, qui généralise un théorème somme-produit de Bourgain concernant l'anneau des réels. On améliore aussi des estimées somme-produit en dimension supérieure obtenues précédemment par Bougain et Gamburd. Deuxièmement, on étudie les projections orthogonales des sous-ensembles de l'espace euclidien et étend ainsi le théorème de projection discrétisé de Bourgain aux projections de rang supérieur. Enfin, dans un travail en commun avec Nicolas de Saxcé, nous démontrons un théorème produit dans les groupes de Lie parfaits. Ce dernier résultat généralise les travaux antérieurs de Bourgain-Gamburd et de SaxcéIn the discretized setting, the size of a set is measured by its covering number by δ-balls (a.k.a. metric entropy), where δ is the scale. In this document, we investigate combinatorial properties of discretized sets under addition, multiplication and orthogonal projection. There are three parts. First, we prove sum-product estimates in matrix algebras, generalizing Bourgain's sum-product theorem in the ring of real numbers and improving higher dimensional sum-product estimates previously obtained by Bourgain-Gamburd. Then, we study orthogonal projections of subsets in the Euclidean space, generalizing Bourgain's discretized projection theorem to higher rank situations. Finally, in a joint work with Nicolas de Saxcé, we prove a product theorem for perfect Lie groups, generalizing previous results of Bourgain-Gamburd and Saxcé
31
Girardi, Nicola. "Regular biproduct decompositions of objects." Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422119.
Full textAbstract:
This thesis mainly pertains biproduct decompositions of objects in certain additive categories that exhibit a peculiar regular behaviour. More precisely, in certain additive categories, a biproduct of objects $\{X_i\}_{i
32
Frank, Regina. "Quantifizierung von Synergiepotentialen bei der Bewertung von Bankenzusammenschlüssen /." Hamburg : Kovač, 2005. http://www.verlagdrkovac.de/3-8300-1641-7.htm.
Full text
33
Draper, Sandra D. "Evalutaion of certain exponential sums of quadratic functions over a finite fields of odd characteristic." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001674.
Full text
34
de, Flon Louise. "Hur undervisas engelsk grammatik i Sverige? : En intervjustudie om undervisningsstrategier i engelsk grammatikundervisning i den svenska grundskolans årskurs 4–6." Thesis, Jönköping University, Högskolan för lärande och kommunikation, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-53897.
Full textAbstract:
Grammatikundervisningen i engelskämnet i den svenska grundskolans årskurs 4–6 har uppmärksammats som ett område där det finns ett behov av vidare forskning. Denna studie ska därför försöka öka kunskapen kring vilka undervisningsstrategier och lärandeteorier som några engelsklärare tar ställning till i sin undervisning. Fokus ligger på grammatik inom ämnet engelska, men även relationen till det svenska språket uppmärksammas. Studien har utgått från en sociokulturell teori då det är ett utvecklande gemensamt lärande som studiens resultat kommer att presentera. Semistrukturerade intervjuer utgör grunden för den empiriska undersökningen som därmed baseras på en kvalitativ metod. Deltagarna är eller har varit verksamma mellanstadielärare i olika kommuner runt om i Sverige. Resultatet och slutsatsen av den empiriska undersökningen uppvisade att lärarna i studien tar hänsyn till olika undervisningsstrategier för att utforma sin grammatikundervisning i engelska. Bland annat använder de läroböcker, digitala verktyg samt olika repetitionsuppgifter. Det framkom även att flera av lärarna utgick från beprövade erfarenheter vid sina grammatiklektioner och genom lärarnas utsagor framkom det att den sociokulturella teorin låg som grund till undervisningen. Det svenska språket har utifrån intervjuerna visat sig inte ha en betydande roll i det engelska klassrummet förutom vid grammatikgenomgångar i engelska. Slutligen visade resultatet att elevernas kunskaper mäts genom framför allt muntliga och skriftliga uppgifter som inte utgörs av grammatikprov.Grammar teaching in the English subject in the Swedish primary school years 4-6 has attracted attention as an under-researched area. This study will therefore try to increase knowledge about the teaching strategies and learning theories that some English teachers use in their teaching. The focus is on grammar in English but the relation to the use of the Swedish language has also been noticed. The study is based on sociocultural theory as the results from the study foreground the importance of collaborative learning. Semi-structured interviews form the basis for the empirical study, which means that it is based on a qualitative methodological point of view. The participants are, or have been, active primary school teachers in years 4-6 from different municipalities in Sweden. The results and the conclusion of the empirical study show that the teachers in the study consider different teaching strategies to design their grammar teaching in the English subject. Among other things, they use textbooks, digital tools, and various repetition assignments. It is also apparent that several of the teachers base their grammar lessons on best practice, and through the teachers’ statements it can be seen that the sociocultural theory is the foundation for their teaching. Based on the interviews, the Swedish language has not been shown to play a significant role in the English classroom except when going through grammatical issues in English. Lastly, the study shows that students' knowledge is primarily measured through oral and written assignments that are not grammar tests.
35
Marek, Tomáš. "Klasifikace dokumentů podle tématu." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2013. http://www.nusl.cz/ntk/nusl-236158.
Full textAbstract:
This thesis deals with a document classification, especially with a text classification method. Main goal of this thesis is to analyze two arbitrary document classification algorithms to describe them and to create an implementation of those algorithms. Chosen algorithms are Bayes classifier and classifier based on support vector machines (SVM) which were analyzed and implemented in the practical part of this thesis. One of the main goals of this thesis is to create and choose optimal text features, which are describing the input text best and thus lead to the best classification results. At the end of this thesis there is a bunch of tests showing comparison of efficiency of the chosen classifiers under various conditions.
36
Abramovitz, Buma, Miryam Berezina, Abraham Berman, and Ludmila Shvartsman. "Some Initiatives in Calculus Teaching." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-79286.
Full textAbstract:
In our experience of teaching Calculus to engineering undergraduates we have had to grapple
with many different problems. A major hurdle has been students’ inability to appreciate the
importance of the theory. In their view the theoretical part of mathematics is separate from the
computing part. In general, students also believe that they can pass their exams even though they
do not have a real understanding of the theory behind the problems they are required to solve. In
an effort to surmount these difficulties we tried to find ways to make students better understand
the theoretical part of Calculus. This paper describes our experience of teaching Calculus. It
reports on the continuation of our previous research.
37
Sarua, Andrei. "Untersuchungen optischer Eigenschaften von porösen Strukturen auf der Basis von III-V-Halbleiterverbindungen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2009. http://nbn-resolving.de/urn:nbn:de:swb:105-5184793.
Full textAbstract:
In der Arbeit wurden sowohl optische, als auch Schwingungs- und Struktur-Eigenschaften poröser Strukturen auf der Basis von n-GaP, n-GaAs und n-InP mit Hilfe der Raman- und FTIR- Spektroskopie untersucht. Speziell den in polaren Materialien auftretenden Fröhlich-Moden wurde dabei besondere Aufmerksamkeit gewidmet. Es wurden experimentelle Ergebnisse theoretischen Modellen auf der Basis der Effektiven Medien Theorie gegenübergestellt. Die Ergebnisse sollen helfen, Grundkenntnisse über die Eigenschaften poröser Halbleiterstrukturen zu gewinnen, um zum einen Anwendungsmöglichkeiten zu erschließen und zum anderen das theoretische Modell zur Beschreibung heterogener Medien zu vervollkommnen.
38
Kasparavičiūtė, Aurelija. "Atsitiktinio skaičiaus nepriklausomų dėmenų didžiųjų nuokrypių teoremos." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140121_101318-21631.
Full textAbstract:
Disertacinio darbo tyrimo objektas yra atsitiktinio dėmenų skaičiaus nepriklausomų vienodai pasiskirsčiusių atsitiktinių dydžių su teigiamais svoriniais koeficientais sumos, kurios kaip modelis sutinkamos, pavyzdžiui, finansų, draudos matematikose. Daromos prielaidos, kad atsitiktinis dėmenų skaičius yra nepriklausomas nuo sumos dėmenų, atsitiktiniai dėmenys tenkina apibendrintą S. N. Bernšteino sąlygą, o atsitiktinis dėmenų skaičius kartu su svoriais tenkina tam tikras suderinamumo sąlygas. Disertacijos tikslas yra standartizuotos (centruotos ir normuotos) minėtos atsitiktinės sumos skirstinio aproksimacija standartiniu normaliuoju dėsniu didžiųjų nuokrypių tiek Kramero, tiek ir laipsninėse Liniko zonose.The research object of this thesis is the sum of a random number of summands of independent identically distributed random variables with positive weights. Such sums appear as models, for example, in insurance, finance mathematics. Throughout the thesis, it is assumed that the random number of summands is independent of the summands, the summands satisfy S. N. Bernstein's condition, and the random number of summands together with weights satisfy some compatibility conditions. The aim of this dissertation is a normal approximation to a distribution of the sum of a random number of summands of independent identically distributed random variables with positive weights that takes into consideration large deviations in both the Cramer and the power Linnik zones.
39
Borenstein, Evan. "Additive stucture, rich lines, and exponential set-expansion." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29664.
Full textAbstract:
Thesis (Ph.D)--Mathematics, Georgia Institute of Technology, 2009.Committee Chair: Croot, Ernie; Committee Member: Costello, Kevin; Committee Member: Lyall, Neil; Committee Member: Tetali, Prasad; Committee Member: Yu, XingXing. Part of the SMARTech Electronic Thesis and Dissertation Collection.
40
Kartaloglou, Elissavet, and Despina Fyntanoglou. "Improving the Interaction and Communication through the LMS Open eClass in Blended Learning." Thesis, Linnéuniversitetet, Institutionen för informatik (IK), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-45286.
Full textAbstract:
Learning Management Systems (LMSs), in a blended learning educational environment, support face to face education and enable enhanced communication and interaction among instructors and students as well as among students. However, Technology-Enhanced Learning (TEL), which improves the learning process, does not come without challenges. The aim of this research is double fold. Firstly, it aims to explore users’ –instructors and students- perceptions on how the LMS Open eClass, in TEI of Athens Greece, supports and facilitates their communication and interaction. Secondly, based on users’ needs and desires, the study aims to formulate suggestions for improving communication and interaction through the platform. The study adopts an interpretivist stance and is built upon an inductive qualitative approach. Firstly, users’ perceptions are solicited through semi-structured interviews and the collected data are analyzed through the thematic analysis method. Subsequently, the study adopts Soft Systems Methodology (SSM) to capture the complexity of the situation, derived from the different worldviews of instructors and students in their association with Open eClass and emerge suggestions for improvements. The results indicate that Open eClass is used to facilitate instructors convey material and information to students, while neither meaningful communication and interaction nor collaboration is performed adequately through the platform. However, the users have expressed a positive disposition towards utilizing these capabilities of the platform, as they recognize their fundamental importance to learning, especially during an economic crisis which constraints the physical presence of many students in classes. Therefore, the study proposes three, accommodating to all, systemically desirable and culturally feasible changes that could improve the situation, mainly based on pedagogy. Overall, this research contributes to existing knowledge about the usage of LMS regarding interaction and communication in a blended learning environment by providing a holistic view on users’ perceptions and identifying changes capable to bring about improvements.
41
Gonzalez, Mary Selva. "Boksamtal : En språkutvecklande metod för andraspråkstalare." Thesis, Södertörns högskola, Lärarutbildningen, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:sh:diva-6248.
Full textAbstract:
The main purpose of this essay is to study how classroom interaction can take place in a class for Second Language Learners (SLL).1 I have applied a case study methodology on a linguistic method used by a Teacher in Swedish as Second Language working on a primary school situated in the Southern suburbs of Stockholm. The learning method is based on extensive reading of books which comprehend several learning techniques organized into a process that support the development of linguistic skills such as discussing in a group, writing, reading and thinking in a second language. The methodology applied is based on observations, on an interview with a Teacher in Swedish as Second Language and on a questionnaire answered by 11 students that participated on “Boksamtal”. Based on a theoretical framework about socio cultural theories on learning and scaffolding,2 I attempt to integrate theory and practice to investigate how the Teacher succeed on applying effective methods for second language learning. Through the analyses of the data is also my intention to emphasize the advantages and disadvantages of such a method. In order to clarify the analysis I have identified two different kind of scaffolding: the Teacher-Student interaction and the scaffolding that creates through the learning methods on “Boksamtal”. The results of the analysis shows that a school organization that affirms the student’s identities, has a well organized program based on context-embedded teaching with a combination of different forms of scaffolding succeed to generate critical language awareness and cognitive skills. On the other hand I found several points that are worth attention such as the a lack of cooperation between the mother tongue Teachers and the other Teachers of the school, and the importance of choosing appropriated books on which the students can easily relate to. Furthermore I found two points that need deeper reflection, which strategies can be used for shy students that do not produce a word and how can the school find adequate support for a second language student born in Sweden who has not attained the expected level. 1 Cummins 2001: 3262 Gibbons 2006: 29
42
Schéle, Ingrid. "Gendered experiences of work environment : A study of stress and ambiguity among dental students in Sweden." Doctoral thesis, Umeå universitet, Institutionen för psykologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-40734.
Full textAbstract:
This thesis explores how dental students experience their education. We aim to generate ways to understand which elements relate to the students’ experience based on current theories and models regarding the quality of working life and gender (and) power relations. Methods Twelve interviews with Umeå dental students in their clinical semesters were analysed with a Grounded Theory (GT) as well as a content analysis approach. A web-survey was sent to all clinical dental students in Sweden (P ≈ 805) with a response rate of 40% (p = 322). The quantitative methods included structural equation modelling and cluster analysis. Results The GT analysis resulted in the core category “Experiencing ambiguity,” that captured the student’s role-ambiguity. Central categories focused on perceived stress and performance assessment in relation to ambiguous inner and outer demands. The content analysis resulted in three categories: “Notions of inequalities,” “Gendering,” and “The student position.” These categories present the ways groups of students are constructed in relation to the student/dentist norm and social gender relations, and how women and men of foreign descent risk subordination and stereotyping. The SEM-model contained psychosocial work environment, tolerance for ambiguity, perceived stress, and student satisfaction. Work environment influenced both perceived stress and satisfaction, and stood for almost all of the explained variance in perceived stress for women, indicating that women are constructed as co-responsible for the work environment. About half of the variance for the men was explained by tolerance for ambiguity, indicating that the feeling of uncertainty may lead to stress in men who include “being in control” in their gender identity. The cluster analysis resulted in a six-cluster solution ranging from “The fresh and positive” to “The worn critiques.” Psychosocial work environment again appeared to be the main factor. Gender also appears to be a factor as the gender distribution in the best as well as the two worst clusters differs from the population. Conclusion Work environment stands out among the factors that relate to the students wellbeing and satisfaction, but the student group is heterogeneous and the ways students perceive their work environment relate to different processes and experiences. We suggest that the ways gender and ethnicity appear to be constructed in relation to the sociocultural gender power relations and the (traditional) medical hierarchy could be of importance for how the students’ experience their psychosocial work environment.
43
Menezes, José Claudemir de. "Áreas e volumes : uma abordagem complementar ao livro "A matemática do ensino médio" SBM - vol 2, E. L. LIMA, et al." Universidade Federal de Sergipe, 2015. https://ri.ufs.br/handle/riufs/6517.
Full textAbstract:
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESIn this work we are treated in detail, three subjects of mathematics that relate to each other: Plane Geometry, Geometry and Spatial Revolution Solid. In this approach, we prioritized the calculation of the area of the lateral surfaces and full of Prism, Pyramid, Cylinder, Cone and Sphere, and the calculation of its volumes in the latter, using the principle of the deduction Cavalieri their formulas. In the study of Revolution Solids, we highlight the theorems of Pappus, used to derive the formulas of surface areas and volumes of cylinder, cone and revolution sphere.
Neste trabalho são tratados, de forma detalhada, três temas da Matemática que se relacionam entre si: Geometria Plana, Geometria Espacial e Sólidos de Revolução. Nessa abordagem, priorizou-se o cálculo da área das superfícies lateral e total do Prisma, da Pirâmide, do Cilindro, do Cone e da Esfera, bem como o cálculo de seus volumes, neste último, utilizando-se o princípio de Cavalieri na dedução de suas fórmulas. No estudo dos Sólidos de Revolução, destacam-se os Teoremas de Pappus, usados para deduzir as fórmulas das áreas das superfícies e dos volumes do Cilindro, do Cone e da Esfera de revolução.
44
Li, Jialun. "Harmonic analysis of stationary measures." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0311/document.
Full textAbstract:
Soit μ une mesure de probabilité borélienne sur SL m+1 (R) tel que le sous-groupe engendré par le support de μ est Zariski dense. Soit V une représentation irréductible de dimension finie de SL m+1 (R). D’après un théorème de Furstenberg, il existe une unique mesure μ-stationnaire sur PV et nous nous somme intéressés à la décroissance de Fourier de cette mesure. Le résultat principal de cette thèse est que la transformée de Fourier de la mesure stationnaire a une décroissance polynomiale. À partir de ce résultat, nous obtenons un trou spectral de l’opérateur de transfert, dont les propriétés nous permettent d’établir un terme d’erreur exponentiel pour le théorème de renouvellement dans le cadre des produits de matrices aléatoires. L’ingrédient essentiel est une propriété de décroissance de Fourier des convolutions multiplicatives de mesures sur R n , qui est une généralisation d’un théorème de Bourgain en dimension 1. Nous établissons cet ingrédient en utilisant un estimée somme produit de He et de Saxcé.Dans la dernière partie, nous généralisons un résultat de Lax et Phillips et un résultat de Hamenstädt sur la finitude des petites valeurs propres de l’opérateur de Laplace sur les variétés hyperboliques géométriquement finiesLet μ be a Borel probability measure on SL m+1 (R), whose support generates a Zariski dense subgroup. Let V be a finite dimensional irreducible linear representation of SL m+1 (R). A theorem of Furstenberg says that there exists a unique μ-stationary probability measure on PV and we are interested in the Fourier decay of the stationary measure. The main result of the thesis is that the Fourier transform of the stationary measure has a power decay. From this result, we obtain a spectral gap of the transfer operator, whose properties allow us to establish an exponential error term for the renewal theorem in the context of products of random matrices. A key technical ingredient for the proof is a Fourier decay of multiplicative convolutions of measures on R n , which is a generalisation of Bourgain’s theorem on dimension 1. We establish this result by using a sum-product estimate due to He-de Saxcé. In the last part, we generalize a result of Lax-Phillips and a result of Hamenstädt on the finiteness of small eigenvalues of the Laplace operator on geometrically finite hyperbolic manifolds
45
Aloui, Karam. "Propriétés arithmétiques et combinatoires de la fonction somme des chiffres." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4083/document.
Full textAbstract:
L'objet de cette thèse est l'étude de certaines propriétés arithmétiques et combinatoires de la fonction somme des chiffres. Nous commençons par étudier les sommes d'exponentielles de la forme $dissum_{nleq x}expleft(2ipileft(frac{l}{m}S_q(n)+frac{k}{m'}S_{q}(n+1)+theta nright)right)$ en vue de montrer un résultat d'équirépartition modulo $1$ et un théorème probabiliste d'ErdH{o}s-Kac. Ensuite, on va généraliser un problème dû à Gelfond concernant l'étude de la répartition dans les progressions arithmétiques de la fonction somme des chiffres au cas des nombres ellipséphiques. En particulier, on donne un théorème analogue à celui d'Erdös, Mauduit et S'arközy sur l'uniforme répartition des entiers ellipséphiques dans les progressions arithmétiques sous une contrainte sur la somme des chiffres. Enfin, une étude de l'ordre moyen de certaines fonctions arithmétiques soumises à des contraintes digitales est faite en conséquence des travaux de Mkaouar et WannèsThe aim of this thesis is the study of some arithmetic and combinatoric properties of the sum of digits function. We start by the study of exponential sums of the form $dissum_{nleq x}expleft(2ipileft(frac{l}{m}S_q(n)+frac{k}{m'}S_q(n+1)+theta nright)right)$ in order to establish a result of equidistribution modulo $1$ in addition to a probabilistic theorem of the kind ErdH{o}s-Kac. Then, we generalize a problem due to Gelfond concerning the distribution in residue classes of the sum of digits function in the case of integers with missing digits. Besides, we give a similar result to that of ErdH{o}s, Mauduit and S'ark"{o}zy on the uniform distribution of integers with missing digits in arithmetic progressions under a constraint on the sum of digits. Finally, a study of the order of magnitude of some arithmetical functions under digital constraints is done as a consequence of the works of Mkaouar and Wannès
46
Basei, Matteo. "Topics in stochastic control and differential game theory, with application to mathematical finance." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424239.
Full textAbstract:
We consider three problems in stochastic control and differential game theory, arising from practical situations in mathematical finance and energy markets.
First, we address the problem of optimally exercising swing contracts in energy markets. Our main result consists in characterizing the value function as the unique viscosity solution of a Hamilton-Jacobi-Bellman equation. The case of contracts with penalties is straightforward. Conversely, the case of contracts with strict constraints gives rise to stochastic control problems where a non-standard integral constraint is present: we get the anticipated characterization by considering a suitable sequence of unconstrained problems. The approximation result is proved for a general class of problems with an integral constraint on the controls.
Then, we consider a retailer who has to decide when and how to intervene and adjust the price of the energy he sells, in order to maximize his earnings. The intervention costs can be either fixed or depending on the market share. In the first case, we get a standard impulsive control problem and we characterize the value function and the optimal price policy. In the second case, classical theory cannot be applied, due to the singularities of the penalty function; we then outline an approximation argument and we finally consider stronger conditions on the controls to characterize the optimal policy.
Finally, we focus on a general class of non-zero-sum stochastic differential games with impulse controls. After defining a rigorous framework for such problems, we prove a verification theorem: if a couple of functions is regular enough and satisfies a suitable system of quasi-variational inequalities, it coincides with the value functions of the problem and a characterization of the Nash equilibria is possible. We conclude by a detailed example: we investigate the existence of equilibria in the case where two countries, with different goals, can affect the exchange rate between the corresponding currencies.In questa tesi vengono considerati tre problemi relativi alla teoria del controllo stocastico e dei giochi differenziali; tali problemi sono legati a situazioni concrete nell'ambito della finanza matematica e, più precisamente, dei mercati dell'energia. Innanzitutto, affrontiamo il problema dell'esercizio ottimale di opzioni swing nel mercato dell'energia. Il risultato principale consiste nel caratterizzare la funzione valore come unica soluzione di viscosità di un'opportuna equazione di Hamilton-Jacobi-Bellman. Il caso relativo ai contratti con penalità può essere trattato in modo standard. Al contrario, il caso relativo ai contratti con vincoli stretti porta a problemi di controllo stocastico in cui è presente un vincolo non standard sui controlli: la suddetta caratterizzazione è allora ottenuta considerando un'opportuna successione di problemi non vincolati. Tale approssimazione viene dimostrata per una classe generale di problemi con vincolo integrale sui controlli. Successivamente, consideriamo un fornitore di energia che deve decidere quando e come intervenire per cambiare il prezzo che chiede ai suoi clienti, al fine di massimizzare il suo guadagno. I costi di intervento possono essere fissi o dipendere dalla quota di mercato del fornitore. Nel primo caso, otteniamo un problema standard di controllo stocastico impulsivo, in cui caratterizziamo la funzione valore e la politica ottimale di gestione del prezzo. Nel secondo caso, la teoria classica non può essere applicata a causa delle singolarità nella funzione che definisce le penalità. Delineiamo quindi una procedura di approssimazione e consideriamo infine condizioni più forti sui controlli, così da caratterizzare, anche in questo caso, il controllo ottimale. Infine, studiamo una classe generale di giochi differenziali a somma non nulla e con controlli di tipo impulsivo. Dopo aver definito rigorosamente tali problemi, forniamo la dimostrazione di un teorema di verifica: se una coppia di funzioni è sufficientemente regolare e soddisfa un opportuno sistema di disequazioni quasi-variazionali, essa coincide con le funzioni valore del problema ed è possibile caratterizzare gli equilibri di Nash. Concludiamo con un esempio dettagliato: indaghiamo l'esistenza di equilibri nel caso in cui due nazioni, con obiettivi differenti, possono condizionare il tasso di cambio tra le rispettive valute.
47
Tröger, Ralph. "Supply Chain Event Management – Bedarf, Systemarchitektur und Nutzen aus Perspektive fokaler Unternehmen der Modeindustrie." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-155014.
Full textAbstract:
Supply Chain Event Management (SCEM) bezeichnet eine Teildisziplin des Supply Chain Management und ist für Unternehmen ein Ansatzpunkt, durch frühzeitige Reaktion auf kritische Ausnahmeereignisse in der Wertschöpfungskette Logistikleistung und -kosten zu optimieren.
Durch Rahmenbedingungen wie bspw. globale Logistikstrukturen, eine hohe Artikelvielfalt und volatile Geschäftsbeziehungen zählt die Modeindustrie zu den Branchen, die für kritische Störereignisse besonders anfällig ist. In diesem Sinne untersucht die vorliegende Dissertation nach einer Beleuchtung der wesentlichen Grundlagen zunächst, inwiefern es in der Modeindustrie tatsächlich einen Bedarf an SCEM-Systemen gibt.
Anknüpfend daran zeigt sie nach einer Darstellung bisheriger SCEM-Architekturkonzepte Gestaltungsmöglichkeiten für eine Systemarchitektur auf, die auf den Designprinzipien der Serviceorientierung beruht. In diesem Rahmen erfolgt u. a. auch die Identifikation SCEM-relevanter Business Services. Die Vorzüge einer serviceorientierten Gestaltung werden detailliert anhand der EPCIS (EPC Information Services)-Spezifikation illustriert.
Abgerundet wird die Arbeit durch eine Betrachtung der Nutzenpotenziale von SCEM-Systemen. Nach einer Darstellung von Ansätzen, welche zur Nutzenbestimmung infrage kommen, wird der Nutzen anhand eines Praxisbeispiels aufgezeigt und fließt zusammen mit den Ergebnissen einer Literaturrecherche in eine Konsolidierung von SCEM-Nutzeffekten. Hierbei wird auch beleuchtet, welche zusätzlichen Vorteile sich für Unternehmen durch eine serviceorientierte Architekturgestaltung bieten.
In der Schlussbetrachtung werden die wesentlichen Erkenntnisse der Arbeit zusammengefasst und in einem Ausblick sowohl beleuchtet, welche Relevanz die Ergebnisse der Arbeit für die Bewältigung künftiger Herausforderungen innehaben als auch welche Anknüpfungspunkte sich für anschließende Forschungsarbeiten ergeben.
48
Davidovich, Orit. "State sums in two dimensional fully extended topological field theories." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-05-3139.
Full textAbstract:
A state sum is an expression approximating the partition function of a d-dimensional field theory on a closed d-manifold from a triangulation of that manifold. To consider state sums in completely local 2-dimensional topological field theories (TFT's), we introduce a mechanism for incorporating triangulations of surfaces into the cobordism ([infinity],2)-category. This serves to produce a state sum formula for any fully extended 2-dimensional TFT possibly with extra structure. We then follow the Cobordism Hypothesis in classifying fully extended 2-dimensional G-equivariant TFT's for a finite group G. These are oriented theories in which bordisms are equipped with principal G-bundles. Combining the mechanism mentioned above with our classification results, we derive Turaev's state sum formula for such theories.text
49
Yu, Chao-Ya, and 游詔雅. "Minimax Theorem and Two-Person Zero-Sum Dynamic Games." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/32196423502244367972.
Full textAbstract:
博士中原大學
應用數學研究所
100
The dissertation is aim to consider the minimax problem on a two-person zero-sum dynamic game. Let X and Y be the stochastic strategy spaces of players I and II, respectively, in a two-person zero-sum dynamic game. The establishment of the total value functions of losses and gains with transition probabilities in the game system will perform the property for minimax problem. Further the minimax theorem is proved for the strategy spaces of the two-person zero-sum game if it follows a law of motion. It is also established that the saddle value function exists under certain conditions so that the equilibrium point exists in the game system. In addition to nonfractional type game, it is proved that the fractional function of the total conditional expectations of players I and II which satisfies Ky Fan type minimax theorem under some reasonable conditions.
50
"Models for strain localization with theories of generalized continua." Tese, MAXWELL, 1997. http://www.maxwell.lambda.ele.puc-rio.br/cgi-bin/db2www/PRG_0991.D2W/SHOW?Cont=2079:pt&Mat=&Sys=&Nr=&Fun=&CdLinPrg=pt.
Full text