Дисертації з теми "Seerah"
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1
Farman, Mursal. "Examining Ibn 'Umar's stance during Fitan times and its impact : Re-reading his approaches to peace and conflict." Phd thesis, Australian Catholic University, 2022. https://acuresearchbank.acu.edu.au/download/efa322b46499dfc4cd9f5deb4d2639660f7c8521420335dc44e47be0c684c8e0/2038016/Farman_2022_Examining_Ibn_Umars_stance_during_Fitan.pdf.
Анотація:
Conflict over the Caliphate after the assassination of the third Caliph, ʿUthmān b. ʿAffān (d. 35/656), has remained a matter of serious concern amongst the Muslim academia and intellectual circles. This conflict resulted in schism among Muslims and caused two series of civil wars. These wars seem to have been a conflict of approaches (theological, socio-political and tribal) towards the Caliphate.
ʿAbd Allāh b. ʿUmar (610 – 73/693), a famous companion of the Prophet, opted for an approach distinct from the prevailing various approaches. Besides his meritorious active role in restoration of peace and harmony, Ibn ʿUmar is a prominent scholar too. His command over the traditional Islamic disciplines (tafsīr, ḥadīth, fiqh, sīrah, tārīkh, etc) is exemplary. His life, traditions, viewpoints, and activities are prominently highlighted in the Islamic literatures.
Despite the mention of Ibn ʿUmar in many sources reporting his peace promoting efforts, however, there is no comprehensive analytical research focusing on his role for the restoration of peace and harmony, its impact upon contemporary people and legacy in post-Ibn ʿUmar period. There seems to be a gap which this study aims to fill through a critical analysis of his views, activities and dealing with fitan through different measures.
This dissertation deals with three aspects of Ibn ʿUmar’s life. First, the positive role that he played during the period of fitan. On the ground of the extensive Islamic literature in Arabic, English and Urdu languages, an attempt has been made to examine the nuances of his approaches to fitan through a chronological study of his life. Second, the impact of Ibn ʿUmar’s role during post-Ibn ʿUmar period. Based on the analysis of the comments on his approaches in fitan and on the comparison of his views with that of Ahl al-Sunnah, an effort has been exerted to measure his influence on later Muslim generations. Third is the leadership model that Ibn ʿUmar offers. On the account of the analysis of his leadership moments specially in fitan times and its comparison with leadership styles, it is aimed to examine his leadership style. Thus, this study argues that with his thoughts and leadership in the times of fitan, Ibn ʿUmar left deep impression on future generations.
2
Wilke, Brigitte. "Der oberrheinische Impressionist Lothar von Seebach (1853-1930) : Monographie und Werkverzeichnis /." Hildesheim : Olms, 2003. http://catalogue.bnf.fr/ark:/12148/cb39126081g.
3
Escobar, Lindber Ivan Salas. "Modelos seesaw a baixas energias e modelo de violação mínima de sabor no modelo seesaw tipo III." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26032013-145746/.
Анотація:
Enquanto todos os modelos com neutrinos massivos de Majorana levam ao mesmo operador efetivo de dimensão d = 5, que não conserva número leptônico, os operadores de dimensão d = 6, obtidos a baixas energias, conservam número leptônico e são diferentes dependendo do modelo de alta energia da nova física. Derivamos os operadores de dimensão d = 6 que são característicos de modelos Seesaw genéricos, no qual a massa do neutrino resulta do intercâmbio de campos pesados que podem ser tanto singletos fermiônicos, tripletos fermiônicos ou tripletos escalares. Os operadores resultantes podem conduzir a efeitos observáveis no futuro próximo, se os coeficientes dos operadores de dimensão d = 5 e d = 6 são desacoplados. Neste trabalho apresentamos o modelo violação mínima de sabor no contexto do modelo seesaw tipo III, no qual é possível obter tal desacoplamento. Isto permite reconstruir a estrutura de sabor a partir dos valores das massas dos neutrino leves e dos parâmetros de mistura, mesmo na presença de fases de violação CP.While all models of Majorana neutrino masses lead to the same dimension five effective operator, which does not conserve lepton number, the dimension six operators induced at low energies conserve lepton number and differ depending on the high energy model of new physics. We derive the low-energy dimension six operators which are characteristic of generic Seesaw models, in which neutrino masses result from the exchange of heavy fields which may be either fermionic singlets, fermionic triplets or scalar triplets. The resulting operators may lead to effects observable in the near future, if the coefficients of the dimension five and six operators are decoupled. In this work we present the model of minimal avor violation in the context of the type III seesaw model, in which it is possible to obtain the decoupling mentioned before. This allows to reconstruct the avour structure of the model from the values of the light neutrino masses and mixing parameters, even in the presence of CP-violating phases.
4
Pereira, Ricardo Aluisio. "Mecanismos Seesaw de geração de massas para neutrinos." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26032013-151946/.
Анотація:
Neste trabalho estudamos os mecanismos de geração de massa para os neutrinos. Inicialmente discorremos sobre o setor eletrofraco do Modelo Padrão dando ênfase para sua construção e os mecanismo de geração de massa das partículas, onde salientamos os limites deste modelo e sua percepção da natureza do neutrino. Utilizando campos do Modelo Padrão, vimos que é possível construir um operador de dimensão 5 que gera termos de massa de Majorana para partículas. Estudamos três realizações renormalizáveis que são pequenas extensões do Modelo Padrão e que a baixas energias exibiam o mesmo padrão que este operador de dimensão 5 que, através de um mecanismo de seesaw, gera massas para partículas neutras leves que são candidatas a neutrino de Majorana.In this work we studied the mechanism of mass generation for neutrinos. Initially we studied the electroweak sector of the Standard Model giving emphasis to its construction and the mass generation mechanism of particles, where we show the limits of this model and its perception of the nature of neutrinos. Using _elds of the Standard Model, we saw that it is possible to construct a dimension 5 operator that generates Majorana mass terms for the particles. We studied three renormalizable realizations which are small extensions of the Standard Model and that, at low energies, exhibit the same pattern as this dimension 5 operator that, through a Seesaw mechanism, generates mass for the light neutral particles that are the candidates to Majorana\'s neutrinos.
5
Deppisch, Frank. "Towards a reconstruction of the SUSY seesaw model." [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=975015230.
6
Caetano, Wellington de Lima. "O espectro de escalares do mecanismo seesaw triplo." Universidade Federal da Paraíba, 2011. http://tede.biblioteca.ufpb.br:8080/handle/tede/5697.
Анотація:
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In this thesis we study some extensions of the Standard Model to accommodate mass for neutrinos. In order to explain the deficit of atmospheric and solar neutrinos observed on Earth, the phenomenon of flavor oscillation between families requires that neutrinos have physical mass eigenstates. For this, we constructed possible mass terms of Majorana or Dirac. We also develop type I-II seesaw mechanisms to generate neutrino masses. Analyzing the applicability of these seesaw mechanisms, we observe, for example, that the type I seesaw requires the existence of heavy right-handed neutrinos mass with the scale of grand unification. Next, we study the triple seesaw mechanism, where we show the possibility of generating neutrino mass using the TeV energy accelerators. We also examine the scalar sector of this mechanism, which is based on a Two Higgs Doublet Model, in addition to standard model content. Finally, we derive the mass spectrum of the scalar, obtaining a stable pseudoscalar with mass close to 10 GeV, as a possible cold dark matter candidate.
Nesta dissertação estudamos algumas extensões do Modelo Padrão que acomodam massa para neutrinos. Para a explicação do déficit de neutrinos solares e atmosféricos observados na Terra, o fenômeno da oscilação de sabores entre as famílias requer que neutrinos tenham autoestados físicos massivos. Para isso, construímos possíveis termos de massa de Dirac ou Majorana e desenvolvemos os mecanismos seesaw dos tipos I e II para geração de massa para neutrinos. Analisando as aplicabilidades destes mecanismos seesaw, observamos, por exemplo, que o seesaw do tipo I requer a existência de neutrinos pesados de mão-direita com massa na escala das teorias de grande unificação. Em seguida, estudamos o mecanismo seesaw Triplo, que tem como base um modelo com dois dubletos e um singleto de escalares, além do conteúdo padrão. Neste modelo, mostramos a possibilidade de geração de neutrinos massivos usando os aceleradores com energia na escala de TeV. Finalmente, analisamos o setor escalar do modelo que realiza este seesaw, onde derivamos o espectro de massa dos escalares, obtendo um pseudoescalar estável com massa próxima a 10 GeV, que é um possível candidato a matéria escura fria.
7
Scarcella, Francesca. "Lepton flavour violation induced by massive right handed neutrinos." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12329/.
Анотація:
In questo lavoro abbiamo studiato le conseguenze della presenza di neutrini di chiralità destrorsa su osservabili caratterizzate da violazione del flavour nel settore leptonico. Queste particelle sono introdotte al fine di generare un termine di massa per i neutrini, in accordo con le recenti osservazioni sperimentali. In particolare, questo lavoro è incentrato sullo studio dei decadimenti del bosone Z in due leptoni di flavour distinto. Tali decadimenti sono proibiti dal Modello Standard e non sono stati ad oggi osservati, ma possono essere indotti a un loop dalla presenza di neutrini massivi. Abbiamo esplorato i decadimenti suddetti nel contesto del modello Seesaw Inverso, il quale prevede, oltre ai tre neutrini leggeri osservati sperimentalmente, tre coppie di neutrini pesanti. In conclusione, abbiamo determinato che il modello Seesaw Inverso può predire, compatibilmente con gli attuali limiti sperimentali su processi relazionati, branching ratio fino a $ 10^{-7} $ nei canali $ \tau -\mu $ oppure $ \tau -e $, per masse dei neutrini pesanti dell'ordine del TeV. Tassi di decadimento di questo ordine di grandezza potrebbero essere accessibili agli acceleratori di particelle di prossima generazione. Questo studio è originale ed è contenuto in un articolo di prossima pubblicazione
8
Baschien, Christiane. "Development and evaluation of rRNA targeted in situ probes and phylogenetic relationships of freshwater fungi." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969147007.
9
Seebach, Niko [Verfasser]. "Modellbasierter Ansatz zur geometrischen Integration fahrfremder Tätigkeiten / Niko Seebach." München : Verlag Dr. Hut, 2020. http://d-nb.info/1222351943/34.
10
Setzer, Nicholas. "[nu] Seesaw uses UV insensitive supersymmetry breaking without tachyons /." College Park, Md.: University of Maryland, 2008. http://hdl.handle.net/1903/8484.
Анотація:
Thesis (Ph. D.) -- University of Maryland, College Park, 2008.Thesis research directed by: Dept. of Physics. Title from t.p. of PDF. On title page "nu" is represented by its Greek letter. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
11
Carratta, Giuseppe. "Search for Type-III Seesaw heavy leptons using proton-proton collisions at sqrt{s} = 13 TeV with the ATLAS detector." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16404/.
Анотація:
La scoperta delle oscillazioni di sapore dei neutrini comporta una massa non nulla per queste particelle. Masse così piccole risultano difficili da spiegare in maniera naturale attraverso un puro accoppiamento di Yukawa con il campo di Higgs, come per gli altri fermioni.
Il meccanismo Type-III Seesaw è un'estensione del Modello Standard che introduce almeno due nuovi tripletti di campi fermionici con ipercarica nulla nella rappresentazione aggiunta del gruppo SU(2)_L, rappresentati da due leptoni carichi pesanti di Dirac e un leptone neutro pesante di Majorana.
In questo elaborato, la ricerca dei leptoni pesanti è stata eseguita basandosi sul processo pp -> W^* -> L^{+-} N^0 -> W^{+-} v W^{+-} l^{-+} usando i dati raccolti dal rivelatore dell'esperimento ATLAS a energie del centro di massa sqrt{s} = 13 TeV con una luminosità integrata di 79.8 fb^-1. Le potenzialità di questo canale puramente leptonico sono dovute alla capacità di rigetto di molti processi di fondo del Modello Standard.
Non è stato trovato alcun eccesso rispetto alle predizioni del Modello Standard, per cui è stato possibile stabilire un limite inferiore sulla massa dei leptoni pesanti di 419 GeV con un livello di confidenza del 95%.
12
Seebach, Anne Gretje [Verfasser]. "Hochauflösende isotopenbasierte Modellierung der Grundwasseranbindung meromiktischer Tagebauseen / Anne Gretje Seebach." Berlin : Freie Universität Berlin, 2011. http://d-nb.info/102551095X/34.
13
Carvajal, Cristian David Ruiz. "Modelos com partículas tipo áxion e o mecanismo seesaw inverso." reponame:Repositório Institucional da UFABC, 2015.
Анотація:
Orientador: Prof. Dr. Alex Gomes DiasDissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Física, 2015.
Construímos modelos que contêm um ou dois axion like particles (ALPs), onde a quebra da simetria global associada, U(1)X, gera as escalas de energia envolvidas no mecanismo seesaw inverso. Estes modelos são motivados pelos experimentos atuais e futuros desenhados para pesquisar efeitos que derivam-se do ALP. Além da existência de indícios sobre fenômenos astrofísicos que podem ser interpretados através das oscilações ALP $ fótons, ou pelo decaimento do ALP em fótons, considerando o ALP como sendo um candidato de matéria escura. Um dos fenômenos astrofísicos é uma linha de 3.55 keV de energia que foi reportada por duas colaborações experimentais no ano 2014, as quais analisaram o espectro dos aglomerados de galáxias e da galáxia Andrômeda. Por outro lado, há indícios de que o universo é mais transparente do que se esperava para fótons de energia muito alta, o que poderia ser explicado por um fenômeno de oscilação do tipo fótonALPfóton na presença de campos magnéticos, explicação que pode ser igualmente válida para o excesso de soft XRay provenientes do aglomerado Coma.
We built models containning one or two axion like particles (ALPs), whose breakdown of the associated global symmetry, U(1)X, generates the energy scales involved in the inverse seesaw mechanism. These models are motivated by the present and future experiments designed for searching eects due to a ALP. Also, there are some hinted astrophysical phenomena that could be interpretated through the ALP $ photon oscilations, or the ALP decay into photons, considering this ALP with a dark matter candidate. One of these phenomena is the signal of 3.55 keV reported in the year 2014 by two experimental groups that examined the spectra of galaxy clusters and the Andromeda galaxy. Furthermore, there are hints that the universe is more transparent than expected to photons with very high energy, and this can be explained through photonALPphoton oscillation in the presence of magnetic elds, an argument also valid for the soft X ray excess from Coma cluster.
14
Schmauch, Benoît. "Nouvelle physique dans le secteur des leptons." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066209/document.
Анотація:
Cette thèse aborde quelques scénarios de nouvelle physique, ainsi que leurs manifestations dans le secteur des leptons.Le fait que les neutrinos soient massifs est un des problèmes non élucidés par le Modèle Standard. Une des solutions possibles est le mécanisme de seesaw, qui fait intervenir de nouveaux états lourds dont la désintégration viole le nombre leptonique. À cause de ce dernier point, ces états peuvent jouer un rôle clé dans la leptogenèse, un des scénarios susceptibles d'expliquer l'origine de l'asymétrie observée entre matière et antimatière dans l'univers. Nous étudions ici la leptogenèse avec un triplet scalaire et nous intéressons tout particulièrement l'impact des effets de saveur.Dans un second temps, nous considérons des théories supersymétriques. Nous étudions un modèle où le partenaire fermionique d'un pseudo-boson de Goldstone joue le rôle d'un neutrino stérile, qui pourrait expliquer certaines anomalies expérimentales. Enfin, pour être viable, la supersymétrie doit être brisée dans un secteur caché, et cette brisure doit ensuite être transmise aux champs de la théorie à basse énergie. Un des scénarios les plus élégants pour cela est la médiation de jauge. Malheureusement, celle-ci peine à reproduire la masse du boson de Higgs mesurée au LHC. Nous nous intéressons ici à des extensions susceptibles de réhabiliter ce scénario tout en le reliant mécanisme de seesawThis thesis addresses some scenarios of new physics as well as their consequences on the lepton sector. The fact that neutrinos are massive is one of the problems left unsolved by the Standard Model. One of the possible solutions is the seesaw mechanism, that involves new heavy states whose decay violates lepton number. Because of this, these states can participate in leptogenesis, one of the scenarios that could explain the origin of the asymmetry between matter and antimatter in our universe. Here, we study leptogenesis with a scalar triplet and consider especially the impact of flavour effects. After that, we turn to supersymmetric models. We consider a model in which the fermionic partner of a pseudo-Goldstone boson, associated to a symmetry broken at high energy, plays the role of a sterile neutrino, that could explain some experimental anomalies. Finally, to be viable, supersymmetry should be broken in a hidden sector, and this breaking should be transmitted to the fields of the low energy theory. One of the most elegant scenarios for this is gauge mediation. Unfortunately, it cannot easily reproduce the mass of the Higgs boson measured at LHC. We study here extensions that could rehabilitate this scenario and relate it to the seesaw mechanism
15
Cerna, Velazco Nhell Heder. "Constraining sleptons at the LHC in a supersymmetric low-scale seesaw scenario." Master's thesis, Pontificia Universidad Católica del Perú, 2017. http://tesis.pucp.edu.pe/repositorio/handle/123456789/8905.
Анотація:
The discovery of the Higgs boson in the 8 TeV run of the LHC [1, 2] marks one of the
most important milestones in particle physics. Its mass is already known rather precisely:
mh = 125.09 ± 0.21 (stat.) ±0.11 (syst.) GeV [3], and the signal strength of various LHC
searches has been found consistent with the SM predictions. While this completes the
Standard Model (SM) particle-wise, several questions still remain open, for example: (i) Is
it possible to include the SM in a grand unified theory where all gauge forces unify? (ii) Is
there a particle physics explanation of the observed dark matter relic density? (iii) What
causes the hierarchy in the fermion mass spectrum and why are neutrinos so much lighter
than the other fermions? What causes the observed mixing patterns in the fermion sector?
(iv) What stabilizes the Higgs mass at the electroweak scale?
Supersymmetric model address several of these questions and consequently the search for
supersymmetry (SUSY) is among the main priorities of the LHC collaborations. Up to now
no significant sign for physics beyond SM has been found. The combination of the Higgs
discovery with the (yet) unsuccessful searches has led to the introduction of a model class
called ‘natural SUSY’ [4–15]. Here, the basic idea is to give electroweak-scale masses only
to those SUSY particles giving a sizeable contribution to the mass of the Higgs boson, such
that a too large tuning of parameters is avoided. All other particle masses are taken at the
multi-TeV scale. In particular, masses of the order of a few hundred GeV up to about one
TeV are assigned to the higgsinos (the partners of the Higgs bosons), the lightest stop (the
partner of the top-quark) and, if the latter is mainly a left-stop, also to the light sbottom In
addition the gluino and the heavier stop masses should also be close to at most a few TeV.
Neutrino oscillation experiments confirm that at least two neutrinos have a non-zero mass.
The exact mass generation mechanism for these particles is unknown, and both the SM and
the MSSM remain agnostic on this topic. Although many ways to generate neutrino mass
exist, perhaps the most popular one is the seesaw mechanism [16–21]. The main problem
with the usual seesaw mechanisms lies on the difficulty in testing its validity. In general, if
Yukawa couplings are sizeable, the seesaw relations require Majorana neutrino masses to be
very large, such that the new heavy states cannot be produced at colliders. In contrast, if
one requires the masses to be light, then the Yukawas need to be small, making production
cross-sections and decay rates to vanish. A possible way out of this dilemma lies on what
3
is called the inverse seesaw [22], which is based on having specific structures on the mass
matrix (generally motivated by symmetry arguments) to generate small neutrino masses.
This, at the same time, allows Yukawa couplings to be large, and sterile masses to be light.
We consider here a supersymmetric model where neutrino data are explained via a minimal
inverse seesaw scenario where the gauge-singlet neutrinos have masses in the range
O(keV) to O(100 GeV). We explore this with a parametrization built for the standard seesaw,
and go to the limit where the inverse seesaw emerges, such that Yukawas and mixings
become sizeable. Although non-SUSY versions of this scenario can solve the dark matter
and matter-antimatter asymmetry problems [23–25], we shall make no claim on these issues
in our model.
In view of the naturalness arguments, we further assume that the higgsinos have masses of
O(100 GeV), whereas the gaugino masses lie at the multi-TeV scale (see [26] for an example
of such a scenario). In addition, we assume all squarks are heavy enough such that LHC
bounds are avoided, and play no role in the phenomenology within this work1. In contrast
we allow for fairly light sleptons and investigate the extent to which current LHC data can
constrain such scenarios.
This paper is organized as follows: in the next section we present the model. Section
III summarizes the numerical tools used and gives an overview of the LHC analysis used
for these investigations. In Section IV we present our findings for the two generic scenarios
which differ in the nature of the lighest supersymmetric particle (LSP): a Higgsino LSP
and a sneutrino LSP. In Section V we draw our conclusions. Appendices A and B give the
complete formulae for the neutrino and sneutrino masses.Tesis
16
Lipscomb, Margaret Mary. "Changing meanings of development : Dudley Seers - an intellectual biography." Thesis, University of Southampton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239394.
17
Seebah, Shalin [Verfasser]. "Molecular and ecological analysis of cellular attachment and induction of transparent exopolymeric particle formation in diatom-bacteria interactions / Shalin Seebah." Bremen : IRC-Library, Information Resource Center der Jacobs University Bremen, 2012. http://d-nb.info/1035219999/34.
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Sampieri, Adriano Rodrigues. "O Seesaw Inverso como mecanismo de geração de pequenas massas para os neutrinos." Universidade Federal da Paraíba, 2012. http://tede.biblioteca.ufpb.br:8080/handle/tede/5746.
Анотація:
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For a long time it is known that neutrinos have mass and are also able to oscilate between their flavor states. However, the Standard Model only contain massless neutrinos, what lead us to believe that, among other known issues of the model, it is not the final theory. If we want to give an explanation to the neutrino masses we would have to extend the Standard Model in such a way to naturally accommodate these tiny masses. A great number of mechanisms appeared for such matters and the Canonical Seesaw Mechanism was highly accepted for its simplicity and beautifulness. Simple because it demands the addition of a minimal set of fields possible to obtain the neutrino mass at the order of sub-eV. Beautiful because it requires the breaking of lepton number at the scale of Great Unification Theories, bringging effects of high energy theories to low energy ones. Nevertheless, its beauty has a price. It will be impossible for the Canonical Seesaw Mechanism to be tested in recent and future experiments, hence new mechanisms emerged with the possibility of being probed by the experiments. We propose a mechanism based on the Inverse Seesaw Mechanism, which gives rise to the neutrino mass at sub-eV relying on a tiny leptonic breaking scale μ ∼ KeV. The Inverse Seesaw is not able to explain, in a natural way, the smallness of the μ parameter and it is here that our modifications emerge. With the introduction of new scalar fields and assuming a Z5⊗Z2 symmetry it is possible to dinamicaly explain the smallness of μ and also recover the Canonical Seesaw formula for the neutrino masses. Along with that, the right-handed neutrinos are able to be at the eletroweak scale, hence it is possible to test the model in actual experiments.
Sabemos há vários anos que os neutrinos possuem massa, bem como oscilam entre seus estados de sabor. No entanto, o Modelo Padrão contém apenas neutrinos sem massa, o que nos leva a crer, juntamente com outros problemas conhecidos da teoria, que ele não é a teoria final. Se quisermos explicar as massas dos neutrinos, devemos estender o Modelo Padrão de tal forma a acomodar estas pequenas massas naturalmente. Muitos mecanismos com este fim surgiram e o Mecanismo Seesaw Canônico se destacou por sua simplicidade e beleza. Simples por exigir a menor modificação possível do Modelo Padrão para que ele seja realizado. Belo pois requer a quebra explícita do número leptônico em uma escala de energia da ordem da escala das Teorias de Grande Unificação, trazendo efeitos de teorias a altas energias para teorias a baixas energias. Contudo, sua beleza tem um preço. Em experimentos recentes e futuros é impossível que o Mecanismo Seesaw Canônico seja testado, consequentemente novos mecanismos surgiram com a possibilidade de que os experimentos possam comprová-los. Nossa proposta é baseada no Mecanismo Seesaw Inverso, cujo objetivo é gerar a massa dos neutrinos da ordem de sub-eV através de uma pequena escala de quebra do número leptônico μ ∼ KeV. O Seesaw Inverso não é capaz de explicar de uma forma natural a pequenez do parâmetro μ e é neste ponto que nossas modificações surgem. Com a introdução de novos campos escalares e assumindo uma simetria Z5 ⊗ Z2 é possível explicar dinamicamente a pequenez de μ e também recuperar a fórmula para as massas dos neutrinos obtidas no Seesaw Canônico. Juntamente com isso, os neutrinos de mão-direita podem ter massas até da ordem da escala Eletro-Fraca, portanto passa a ser possível que este modelo seja testado em experimentos atuais.
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Josse-Michaux, François-Xavier. "Recent developments in thermal leptogenesis : the role of flavours in various seesaw realisations." Paris 11, 2008. http://www.theses.fr/2008PA112081.
20
Redelbach, Andreas. "SUSY seesaw model and phenomenological implications for leptonic processes at low energies and leptogenesis." Doctoral thesis, [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=976064316.
21
Dalley, Jeffrey Brian. "The Seesaw of Organisational Social Capital Flows: Inside the "Black Box" of Social Exchange." Thesis, University of Canterbury. Management, 2011. http://hdl.handle.net/10092/6001.
Анотація:
The purpose of this study is to develop deeper understanding of the informal contributions of employees to organisational success; more specifically, the exchange ‘mechanism’ by which resources accrue to organisations through the social relationships of their members. The second purpose is to explore the influence of organisational contextual factors on this exchange mechanism; more specifically, the influence – if any – of contingent employment practices.
Through the use of a qualitative research design, I have gained an in-depth understanding of the cognitive mechanism employed by organisational actors to arrive at a decision on whether or not to initiate social exchange, in order to facilitate the flow of organisational social capital.
Data was analysed using Dimensional Analysis method. This analysis draws on the theoretical perspectives of interpretivism and symbolic interactionism, both of which are underpinned by a social construction epistemology. This provides the necessary link for understanding the connections between macro- and micro-level social action of social exchange in organisational settings.
My findings identify a complex cognitive process employed by actors for the purpose of reaching a decision with respect to initiating social exchange in organisational settings. This process is termed Social Exchange Transaction Analysis. It is undertaken at the individual level and ultimately controls the flow of organisational social capital through a social network to the organisation. This complexity is a reflection of both the many dimensions of the phenomenon, and the interconnectedness and interactions between them. Social Exchange Transaction Analysis builds an ‘analytical’ picture of the potential social exchange transaction, to enable the organisational actor to arrive at a decision on whether or not to initiate social exchange – and thereby facilitate the flow of organisational social capital.
22
Hatane, Seema Sam. "Post-apartheid desegregation in Vereeniging, 1991-1996 / by Seema Sam Hatane." Thesis, Potchefstroom University for Christian Higher Education, 2003. http://hdl.handle.net/10394/337.
Анотація:
In 1923, when the concept of Black locations was introduced following the
Blacks (Urban Areas) Act, the Blacks became segregated from the other
racial groups and were forced to live on the peripheries of towns.
Subsequently, the passing of the Group Areas Act of 1950 and 1966 ensured
the maximisation of a geographical distance between the Whites, Coloureds.
and Indians, thereby giving the South African towns and cities a racially
demarcated character. However, in June 1991 the Abolition of Racially
Based Land Measures Act, 1991 (10811991) was passed to herald a socio-political
change. This reversion of policy by Government therefore gave rise
to the current investigation into desegregated settlements.
The purpose of, this survey study was to describe and explain the
phenomenon of desegregation in the South African town of Vereeniging after
the repeal of the Group Areas Act, 1950 (4111950). Pertinently this study
contemplated the following specific aims: First, to determine the extent of
desegregation in terms of the number and spatial distribution of Black
migrants in the former White residential areas in Vereeniging. Secondly to
describe and explain the nature of desegregation in Vereeniging in terms of
the socio-economic characteristics of the Black migrants.
It was first postulated that residential desegregation in Vereeniging was still of
limited extent, and that residential areas in the town were unequally exposed
to the process of desegregation. Secondly, that the spatial patterns of
desegregation were modulated by the socio-economic characteristics of Black
migrants. Therefore, the rating records that contained useful information
about the property owners from the Vereeniging-Kopanong Metropolitan Substructure
were used to develop a sampling frame. A total of 1 394 Black
migrants was identified on the basis of unique African surnames. A sample
of 326 randomly selected participants was identified. The questionnaires
were distributed to the participants residential addresses.
The completed questionnaires were collected personally from the
participants. The rationale for this was to, inter alia, maintain a good rapport
with the participants. The Information Technology and Management (ITM) of
the Vaal Triangle campus of the Potchefstroomse Universiteit vir Christelike
Hoër Onderwys was used to capture and analyse the data through the
Statistical Analysis System (SAS) programme. The lndex of Dissimilarity and
lndex of Segregation were calculated to determine the socio-spatial
distribution of Black migrants in the town.
The cross tabulations were applied with respect to some items of the
questionnaire in order to determine the degree of association between one
variable and the other. It, however, became apparent from the subsequent
analyses that the number of Blacks who lived in the White areas of
Vereeniging was relatively small. This finding provided a support to the
postulate that residential desegregation in Vereeniging was still of limited
extent. Confirming this finding was the town's 0,3% to 19,0% desegregation
range. Even so, highly desegregated scenarios manifested in the central
business district (CBD) and in areas of the town that are continguous to the
Black townships.
Finally, this study has recommended that urban geographers should
investigate the liveability of White migrants who began to migrate to Black
townships immediately after all residential areas, including the Black areas,
were declared desegregated in terms of the Abolition of Racially Based Land
Measures Act , 1991 (10811991).Thesis (M.A.)--Potchefstroom University for Christian Higher Education, 2003.
23
Lima, Dibartolomei Antônio Pereira de. "Mecanismos de geração de massa para neutrinos." Universidade Federal da Paraíba, 2010. http://tede.biblioteca.ufpb.br:8080/handle/tede/5699.
Анотація:
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Studied in this work two mechanisms for generating mass for the neutrinos which are extentions of the SM. The first chapter is a presentation of the Standard Model with its contents and properties. The second chapter discusses an extension with the insertion of the right-handed neutrino component that implies in Dirac s massive particle and a Majorana mass term, which combines with the first term to result in Type I Seesaw. In The third chapter the extension is made by adition of a triplet of scalars that generates to a Majorana mass term for neutrinos leading to Type II Seesaw. In The last chapter we study the effective operator at low energies that generates as a more elegant and short mass for neutrinos associate without which the fundamental theory that leads to that operator.
Estudamos neste trabalho dois mecanismos para geração de massa para neutrinos que são extensões do MP. O segundo capítulo é uma apresentação do Modelo Padrão com seu conteúdo e principais aspectos. No terceiro capítulo abordamos uma extensão com a inserção da componente de mão-direita do neutrino implicando em neutrinos massivos de Dirac, e num termo de massa de Majorana cuja combinação com o primeiro termo resulta no Mecanismo de Seesaw tipo I. No quarto capítulo a extensão é feita pela adição de um tripleto de escalares por SU(2) fornecendo um termo de massa de Majorana para os neutrinos levando ao Mecanismo de Seesaw tipo II. O último capítulo apresentamos o operador efetivo em baixas energias que fornece a massa pequena dos neutrinos sem associar qual a teoria fundamental que leva a este operador.
24
Jiang, Shaohua Verfasser], and Seema [Akademischer Betreuer] [Agarwal. "Electrospun Nanofiber Reinforced Composites: Fabrication and Properties / Shaohua Jiang. Betreuer: Seema Agarwal." Bayreuth : Universität Bayreuth, 2014. http://d-nb.info/1060009803/34.
25
Lamoureux, Mathieu. "Recherche de neutrinos lourds avec l'expérience T2K." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS187/document.
Анотація:
La masse non-nulle des neutrinos rend nécessaire l'introduction de nouvelle physique pour expliquer celle-ci. Par exemple, l'ajout de neutrinos lourds avec une masse de l'ordre du GeV permettrait d'expliquer à la fois la masse des neutrinos et l'asymétrie matière-antimatière dans l'Univers, comme cela est proposé dans le modèle nuMSM.Un domaine de masse particulièrement intéressant pour ces nouvelles particules est celui entre 140 et 493 MeV/c^2, qui est accessible avec les expériences actuelles, en particulier avec le détecteur proche ND280 de l'expérience T2K, expérience d'oscillation des neutrinos située au Japon.L'analyse vise à isoler un échantillon de désintégrations de neutrinos lourds dans ND280, après leur production dans la désintégration de kaons chargés dans le faisceau de T2K. Le bruit de fond provenant d'interactions de neutrinos a été réduit à quelques événements dans l'ensemble des données de T2K (2010-2017), ce qui permet de contraindre l'espace des paramètres des neutrinos lourds de manière compétitive par rapport aux expériences dédiées comme PS191.Une des étapes importantes de l'analyse consiste à valider les algorithmes de reconstruction et les simulations du bruit de fond attendu, ce qui a nécessité d'étudier les interactions de neutrinos actifs dans les murs des TPCs; Cet échantillon a également pu être utilisé pour des études de physique.Un dernier travail effectué durant cette thèse concerne la mise à niveau du détecteur ND280, prévue d'ici 2021, dans le but d'augmenter la précision des mesures de section efficace d'interaction des neutrinos afin d'améliorer les analyses des oscillationsNon-zero neutrino mass requires the introduction of new physic beyond the Standard Model. For instance, the nuMSM (Neutrino Minimal Standard Model) predicts the existence of new heavy neutrinos, with masses at GeV-scale, that would explain both neutrino masses and baryon asymmetry in the Universe.A particularly interesting mass domain is between 140 and 493 MeV/c^2, which is accessible to current experiments, in particular with the near detector ND280 of the T2K experiment, which is a long baseline neutrino oscillation experiment located in Japan.The analysis aims at the selection of a sample containing heavy neutrino decays, after they have been produced in kaon decays along the standard T2K neutrino beam. Background coming from standard neutrino interactions has been reduced to few events in the current dataset (2010-2017), which allow to constrain heavy neutrino parameter space quite well with respect to dedicated experiments such as PS191.An important step in the analysis consists in the validation of the reconstruction algorithms and of the expected background. It has been done with the study of active neutrino interactions in the walls of the TPCs. This sample is also interesting per se for physics.A last topic in this thesis concerns the upgrade of the near detector, that is scheduled for 2021. The goal is to improve neutrino cross-section measurements in order to get more precise determination of oscillation parameters
26
Bergström, Johannes. "Predictions of Effective Models in Neutrino Physics." Licentiate thesis, KTH, Teoretisk partikelfysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-35267.
Анотація:
Experiments on neutrino oscillations have confirmed that neutrinos have small, but non-zero masses, and that the interacting neutrino states do not have definite masses, but are mixtures of such states.The seesaw models make up a group of popular models describing the small neutrino masses and the corresponding mixing.In these models, new, heavy fields are introduced and the neutrino masses are suppressed by the ratio between the electroweak scale and the large masses of the new fields. Usually, the new fields introduced have masses far above the electroweak scale, outside the reach of any foreseeable experiments, making these versions of seesaw models essentially untestable. However, there are also so-called low-scale seesaw models, where the new particles have masses above the electroweak scale, but within the reach of future experiments, such as the LHC.In quantum field theories, quantum corrections generally introduce an energy-scale dependence on all their parameters, described by the renormalization group equations. In this thesis, the energy-scale dependence of the neutrino parameters in two low-scale seesaw models, the low-scale type I and inverse seesaw models, are considered. Also, the question of whether the neutrinos are Majorana particles, \ie , their own antiparticles, has not been decided experimentally. Future experiments on neutrinoless double beta decay could confirm the Majorana nature of neutrinos. However, there could also be additional contributions to the decay, which are not directly related to neutrino masses. We have investigated the possible future bounds on the strength of such additional contributions to neutrinoless double beta decay, depending on the outcome of ongoing and planned experiments related to neutrino masses.QC 20110812
27
Chen, Fei [Verfasser], and Seema [Akademischer Betreuer] Agarwal. "Functional Nanostructured Materials : Synthetic Aspects & Properties Evaluation / Fei Chen. Betreuer: Seema Agarwal." Marburg : Philipps-Universität Marburg, 2011. http://d-nb.info/1014851734/34.
28
Isart, Garriga Carles. "Estudi de reaccions catalitzades per l’oxazolidinona de Seebach i per aurats de tipus Na[AuBrx(OH)y]." Doctoral thesis, Universitat de Barcelona, 2011. http://hdl.handle.net/10803/96475.
Анотація:
En la present Tesi s’han abordat dos camps de gran actualitat en la Química Orgànica actual, l’organocatàlisi i la catàlisi promoguda per complexos d’Au(III). En ambdós blocs s’han orientat els esforços en la recerca de nous mètodes sintètics o en aprofundir en els ja existents a fi de millorar−los; sense perdre de vista en cap cas la seva aplicabilitat a casos sintètics reals.
En el primer Bloc s’ha tractat de solucionar el problema de la lentitud de moltes de les transformacions organocatalíques. S’ha trobat com la oxazolidinona derivada de la condensació de la L−prolina amb el pivalaldehid (oxazolidinona de Seebach, d’ara endavant SolPro) permet dur a terme reaccions aldòliques entre cetones i aldehids en tan sols dues hores, millorant significativament molts dels temps de reacció descrits en la literatura. Els estudis per RMN de 1H van permetre de determinar que el procés clau era el bescanvi del pivalaldehid amb la cetona corresponent. També es van realitzar una sèrie de càlculs teòrics a fi d’esbrinar quin o quins podien ser els mecanismes implicats en aquests bescanvis. En el darrer capítol del Bloc 1 s’ha avaluat l’activitat catalítica de la SolPro en la reacció de Michael entre nitroalcans i cetones alfa,beta−insaturades, trobant−se que també l’accelera però no de manera tan espectacular com en el cas de l’aldòlica.
En el segon Bloc s’han estudiat diverses transformacions que involucren, directa o indirectament, el grup nitro. En el capítol 2.2 s’han preparat diverses N−sulfenilimines quirals amb un procediment desenvolupat recentment en el nostre grup de recerca. En el capítol 2.3 s’ha posat a punt un mètode d’hidròlisi d’N−sulfenilimines realment suau i que evita la racemització dels estereocentres en alfa. Després d’haver provat diversos àcids de Lewis s’ha trobat que l’ús de quantitats catalítiques d’AuBr3 més l’addició de nitrit d’isoamil, permet d’obtenir cetones quirals a partir de la corresponent N−sulfenilimina. A més, és possible acoblar el mètode de formació d’N−sulfenilimines amb el d’hidròlisi d’aquestes, de manera que s’ha desenvolupat una reacció de Nef formal que transcorre en condicions molt suaus (pH pràcticament neutre) i sense racemització dels estereocentres en alfa. En el capítol 2.4 s’ha estudiat la transformació d’oximes a carbonils. De nou, l’AuBr3 s’ha mostrat com l’únic àcid de Lewis que permet la formació de cetones (o aldehids) a partir d’oximes. S’ha aconseguit que el procés sigui catalític si s’empra biacetil o isovaleraldehid com additius. Les condicions en les que té lloc la reacció són suaus (si bé el pH baixa lleugera o moderadament durant el decurs de la reacció). S’ha fet un estudi pioner per Espectrometria de Masses en Electroesprai en mode negatiu a fi de conèixer els detalls mecanístics, trobant−se que les espècies de tipus AuBrx(OH)y─ són les predominants i com la oxima s’hi coordina desplaçant Br─. El mètode s’ha aplicat a més d’una vintena de cetoximes i aldoximes obtenint−se resultats excel•lents.This Thesis deals about Organocatalysis and gold−mediated catalysis, two fields that have experienced a rapid growth in recent years. In both sections, the efforts have been focused in the development of new synthetic methodologies or in gaining insight into existing procedures in order to improve them. In the first section, we attempted to solve the problem of the slow rate of some organocatalytic transformations. Several oxazolidinones were prepared and then were tested in aldol reactions between ketones and aldehydes. The most efficient was Seebach’s oxazolidinone (SolPro). With this catalyst aldol reaction take less than 2 hours. Exchanges between pìvalaldehyde and different ketones were proved by 1H-NMR studies which suggested that these exchanges are essential in the mechanism. Finally, in chapter 1.5, the scope of the catalytic activity of SolPro was evaluated in a Michael reaction between nitroalkanes and alpha, beta-unsaturated ketones. Transformations in which the nitro group is involved were studied in the second section. In chapter 2.2 several chiral N-sulphenylimines were prepared according a novel procedure developed in our group. In chapter 2.3 a novel method to hydrolyze N-sulphenylimines was developed, which works in very mild conditions (room temperature, almost neutral pH) and avoids the racemization of alpha stereocenters. After an exhaustive screening of several Lewis acids, only AuBr3 catalyzed the reaction at neutral pH and afforded the corresponding ketone without racemization of alpha-stereocenters. Finally, in chapter 2.4, the transformation of oximes into carbonyl compounds was studied. Again, only AuBr3 was able to perform the hydrolysis of oximes into ketones (or aldehydes) in mild conditions (although the pH decreased slightly or moderately during the reaction). A pioneering study by Mass Spectroscopy (Electrospray in negative mode) showed that oximes coordinate to species like AuBrx(OH)y─ and this coordination is crucial in order to obtain the carbonyl compound.
29
Franco, Edison Tadeu [UNESP]. "Modelos de Seesaw com U(1) adicional e teoria de grande unificação em SU(5) sem supersimetria." Universidade Estadual Paulista (UNESP), 2009. http://hdl.handle.net/11449/132788.
Анотація:
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Franco, Edison Tadeu. "Modelos de Seesaw com U(1) adicional e teoria de grande unificação em SU(5) sem supersimetria /." São Paulo, 2009. http://hdl.handle.net/11449/132788.
Анотація:
Orientador: Vicente PleitezBanca: Ricardo Jorge González Felipe
Banca: Orlando Luis Goulart Peres
Banca: José Antonio Martins Simões
Banca: Dionizio Bazeia Filho
Resumo: A construção de modelos de unificação continua sendo de grande interesse fenomenológico. As teorias baseadas no grupo de simetrias SU (5), apesar de terem suas versões mínimas, com apenas um multipleto da representação fundamental e um decupleto fermiônicos, praticamente excluídas pelos dados experimentais, continuam sendo de grande interesse desse ponto de vista. Modelos experimen- talmente plausíveis, onde o decaimento do próton é evitado pela separação dos setores de léptons e quarks do Modelo Padrão (MP) em diferentes multipletos, em conjunto com a implementação de si- metrias cíclicas discretas, 'dzeta IND. n', poderiam explicar o porquê do próton ter se mantido estável até a idade atual do universo. De fato, ao mesmo tempo que as simetrias cíclicas protegem o próton de operadores que induzem seu decaimento, elas são naturalmente implementadas quando o problema de CP forte é resolvido via áxion invisível, mantendo, ao mesmo tempo, o áxion livre de possíveis efeitos gravitacio- nais para uma simetria cíclica 'dzeta IND. 13'. Entretanto, a fenomenologia completa para os modelos SU (5) deve ser cuidadosamente formulada, uma vez que deseja-se que qualquer nova teoria que venha comple- mentar o MP implemente, por exemplo, massa para todas as partículas conhecidas. Todavia, a simples estruturação da teoria pode não ser suficiente para a solução das massas dos neutrinos. De fato, os modelos mais simples, enquanto explicam os dados de oscilação dos neutrinos, geram problemas para o decaimento do próton, uma vez que introduzem fases da simetria 'dzeta IND. n' que geram operadores perigosos. A solução para esse problema é a inclusão de massas apenas pela quebra espontânea de uma simetria adicional. O termo de Yukawa direto na Lagrangiana é acoplado à uma U{1) quiral adicional, que é espontaneamente quebrada pelo singleto acoplado aos neutrinos ativos. Mostra-se que...
Abstract: The construction of unification models remain of great phenomenological interesting. The theories based on SU(5) symmetry group, despite having their minimalist versions, with only a fermionic mul- tiplet of fundamental representation an one decuplet, almost excluded from experimental data, remain of great interest from this point of view. Experimentally plausible models, where the proton decay is avoided by separation of Standard Model (SM) lepton and quark sectors in different multiplets, together with the implementation of cyclic symmetries, 'dzeta IND. n', could explain why the proton has remained stable until the current age of the universe. Indeed, while protecting the proton from operators that induces their decay, discrete symmetries are naturally implemented when the strong CP problem is solved by invisible axion, keeping, at the same time, the axion protected against possible semi-classical gravitational effects for a cyclical 'dzeta IND. 13' symmetry. However, the complete phenomenology for SU{5) models should be carefully formulated, once one want to have that any new theory, which comple- ment the SM, implement, for example, mass for all known particles. However, the simple structure of the theory may not be sufficient for the solution of the neutrino masses. In fact, the simplest models, while explaining the data of neutrino oscillation, create problems for proton decay, since introduces 'dzeta IND. n' symmetry charges that generate dangerous operators. The solution to this problem is the inclusion of mass term only by additional symmetry. The direct Yukawa term in the Lagrangian is coupled to an additional chiral U(1) symmetry, which is spontaneously broken by the singlet coupled to the active neutrinos. It shows that when these symmetries are implemented locally, complementing the gauge structure of the SM, the seesaw mechanism of types I and III can not be simultaneously...
Doutor
31
Seuring, Jan [Verfasser], and Seema [Akademischer Betreuer] Agarwal. "Polymers with Upper Critical Solution Temperature in Aqueous Solution / Jan Seuring. Betreuer: Seema Agarwal." Marburg : Philipps-Universität Marburg, 2012. http://d-nb.info/102807249X/34.
32
Zhang, Yi Verfasser], and Seema [Akademischer Betreuer] [Agarwal. "Novel degradable polymeric materials for biomedical and antibacterial applications / Yi Zhang. Betreuer: Seema Agarwal." Marburg : Philipps-Universität Marburg, 2012. http://d-nb.info/1027183778/34.
33
Zhang, Yi [Verfasser], and Seema [Akademischer Betreuer] Agarwal. "Novel degradable polymeric materials for biomedical and antibacterial applications / Yi Zhang. Betreuer: Seema Agarwal." Marburg : Philipps-Universität Marburg, 2012. http://nbn-resolving.de/urn:nbn:de:hebis:04-z2012-09251.
34
Seebach, Janina Katrin [Verfasser], and Dan [Akademischer Betreuer] Rujescu. "Einfluss von Polymorphismen des DAO-Gens auf Schizophrenie und den Endophänotyp Gedächtnisleistung / Janina Katrin Seebach. Betreuer: Dan Rujescu." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2014. http://d-nb.info/1049890965/34.
35
Wang, Hui [Verfasser], and Seema [Akademischer Betreuer] Agarwal. "Preparation and characterization of dual functional antimicrobial (bio)degradable polymers / Hui Wang. Betreuer: Seema Agarwal." Bayreuth : Universität Bayreuth, 2016. http://d-nb.info/1108406181/34.
36
Liu, Li [Verfasser], and Seema [Akademischer Betreuer] Agarwal. "Investigation of electrospun nano-fibrous polymeric actuators： Fabrication and Properties / Li Liu ; Betreuer: Seema Agarwal." Bayreuth : Universität Bayreuth, 2018. http://d-nb.info/1164077163/34.
37
Peng, Ling [Verfasser], and Seema [Akademischer Betreuer] Agarwal. "Bicomponent Porous Fibrous Membranes with Special Fiber Morphologies and Properties / Ling Peng ; Betreuer: Seema Agarwal." Bayreuth : Universität Bayreuth, 2018. http://d-nb.info/1159632944/34.
38
Kan'an, Tarek Ghaze. "Arabic News Text Classification and Summarization: A Case of the Electronic Library Institute SeerQ (ELISQ)." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/74272.
Анотація:
Arabic news articles in heterogeneous electronic collections are difficult for users to work with. Two problems are: that they are not categorized in a way that would aid browsing, and that there are no summaries or detailed metadata records that could be easier to work with than full articles. To address the first problem, schema mapping techniques were adapted to construct a simple taxonomy for Arabic news stories that is compatible with the subject codes of the International Press Telecommunications Council. So that each article would be labeled with the proper taxonomy category, automatic classification methods were researched, to identify the most appropriate. Experiments showed that the best features to use in classification resulted from a new tailored stemming approach (i.e., a new Arabic light stemmer called P-Stemmer). When coupled with binary classification using SVM, the newly developed approach proved to be superior to state-of-the-art techniques. To address the second problem, i.e., summarization, preliminary work was done with English corpora. This was in the context of a new Problem Based Learning (PBL) course wherein students produced template summaries of big text collections. The techniques used in the course were extended to work with Arabic news. Due to the lack of high quality tools for Named Entity Recognition (NER) and topic identification for Arabic, two new tools were constructed: RenA for Arabic NER, and ALDA for Arabic topic extraction tool (using the Latent Dirichlet Algorithm). Controlled experiments with each of RenA and ALDA, involving Arabic speakers and a randomly selected corpus of 1000 Qatari news articles, showed the tools produced very good results (i.e., names, organizations, locations, and topics). Then the categorization, NER, topic identification, and additional information extraction techniques were combined to produce approximately 120,000 summaries for Qatari news articles, which are searchable, along with the articles, using LucidWorks Fusion, which builds upon Solr software. Evaluation of the summaries showed high ratings based on the 1000-article test corpus. Contributions of this research with Arabic news articles thus include a new: test corpus, taxonomy, light stemmer, classification approach, NER tool, topic identification tool, and template-based summarizer – all shown through experimentation to be highly effective.Ph. D.
39
Baid-Agrawal, Seema [Verfasser]. "New extrahepatic manifestations of Hepatitis C infection after kidney and liver transplantation / Seema Baid-Agrawal." Berlin : Medizinische Fakultät Charité - Universitätsmedizin Berlin, 2012. http://d-nb.info/1026884225/34.
40
Sutherland, Alexander Mackenzie. "The Brahan Seer : the making of a legend, c1570-2001." Thesis, University of Aberdeen, 2005. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU206015.
Анотація:
This thesis traces the legend of the Brahan Seer between the sixteenth and twenty-first centuries. It considers the seer figure in relation to aspects of Highland culture and society that shaped its development during this period. These include the practice and prosecution of witchcraft; the reporting of and scientific investigation of instances of second sight; and the perennial belief in and use of prophecy as a means of predicting events. In so doing the thesis provides a set of historicised contexts for understanding the genesis of the legend and how it changed over time. It also makes a contribution to the debates about not only witchcraft, second sight and prophecy but also the relationship between 'popular' and 'elite' culture in Scotland. By taking the Brahan Seer as a case study it argues that 'popular' culture is not antithetical to 'elite' culture but rather in constant (and complex) interaction with it.
41
Pletsch, Holger Verfasser], and Seema [Akademischer Betreuer] [Agarwal. "Design of Elastic Nanocomposite Materials from Polymers and Noble Metal Nanoparticles / Holger Pletsch. Betreuer: Seema Agarwal." Bayreuth : Universität Bayreuth, 2015. http://d-nb.info/1073944247/34.
42
Pineda, Contreras Paul [Verfasser], and Seema [Akademischer Betreuer] Agarwal. "Design and Investigation of Vinylcyclopropanes (VCPs) as Fast Curing Resins / Paul Pineda Contreras ; Betreuer: Seema Agarwal." Bayreuth : Universität Bayreuth, 2017. http://d-nb.info/1128228157/34.
43
Pletsch, Holger [Verfasser], and Seema [Akademischer Betreuer] Agarwal. "Design of Elastic Nanocomposite Materials from Polymers and Noble Metal Nanoparticles / Holger Pletsch ; Betreuer: Seema Agarwal." Bayreuth : Universität Bayreuth, 2015. http://d-nb.info/1124788166/34.
44
Veettil, Seena Koyadan [Verfasser]. "Fluorescence correlation spectroscopy of autofluorescent proteins and its applications in live cell membranes / Seena Koyadan Veettil." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2012. http://d-nb.info/1023934310/34.
45
Zhu, Jian [Verfasser], and Seema [Akademischer Betreuer] Agarwal. "High-performance Electrospun Polymer Nanofibres and Their Composite Materials with Hectorite / Jian Zhu ; Betreuer: Seema Agarwal." Bayreuth : Universität Bayreuth, 2019. http://d-nb.info/1196201730/34.
46
García-Rosell, Peña Alexandra. "Estrategias de promoción para la captación de clientes de la empresa Seesaw Ascensores E.I.R.L. en la ciudad de lima 2021." Bachelor's thesis, Universidad Católica Santo Toribio de Mogrovejo, 2021. http://hdl.handle.net/20.500.12423/3509.
Анотація:
Esta investigación busca conocer el uso adecuado de estrategias de promoción para lograr una correcta captación de clientes de una empresa de ascensores con herramientas de marketing. Teniendo como Objetivo Principal proponer estrategias de promoción para la captación de clientes de Seesaw Ascensores E.I.R.L. en la Ciudad de Lima. Se realizó un enfoque cualitativo porque recogió información para descubrir o afinar preguntas de investigación mediante una entrevista de siete preguntas abiertas a tres de los clientes para recolectar datos. Es de tipo descriptiva ya que se orienta a describir el problema y proyectiva porque consiste en la elaboración de una propuesta para solucionar el problema. La presente investigación es no experimental transversal que se realiza sin manipular variables y en los que sólo se observan los fenómenos en su ambiente natural para después analizarlos, y transversal donde se recolectan datos en un solo momento, en un tiempo único y su propósito es describir variables y el número de casos dados en un momento determinado. Esta empresa no estuvo ajena al problema originado por la pandemia, viéndose afectada directamente en las ventas, pese a la reactivación del sector construcción se ha identificado que sus clientes necesitan de incentivos, descuentos y promociones para adquirir los equipos de elevación vertical. Afirmando que en cuanto a la efectividad de estas estrategias logran además mejorar el nivel de captación y competitividad en el rubro donde la empresa se desarrolla. Se identificó que la empresa de la presente investigación, no coloca contenido a su página de Facebook ni promocionar sus publicaciones, no participa de eventos virtuales para lograr captar más seguidores y futuros compradores, no participa de expo ferias de construcción y no realiza una cercana experiencia post venta con los clientes. Se llega a concluir que el objetivo de la empresa es generar más clientes de manera interactiva con su red social Facebook para potenciar su página.
47
Weiland, Cedric. "Effects of fermionic singlet neutrinos on high- and low-energy observables." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00922999.
Анотація:
In this doctoral thesis, we study both low- and high-energy observables related to massive neutrinos. Neutrino oscillations have provided indisputable evidence in favour of non-zero neutrino masses and mixings. However, the original formulation of the Standard Model cannot account for these observations, which calls for the introduction of new Physics. Among many possibilities, we focus here on the inverse seesaw, a neutrino mass generation mechanism in which the Standard Model is extended with fermionic gauge singlets. This model offers an attractive alternative to the usual seesaw realisations since it can potentially have natural Yukawa couplings (O(1)) while keeping the new Physics scale at energies within reach of the LHC. Among the many possible effects, this scenario can lead to deviations from lepton flavour universality. We have investigated these signatures and found that the ratios R_K and R_π provide new, additional constraints on the inverse seesaw. We have also considered the embedding of the inverse seesaw in supersymmetric models. This leads to increased rates for various lepton flavour violating processes, due to enhanced contributions from penguin diagrams mediated by the Higgs and Z bosons. Finally, we also found that the new invisible decay channels associated with the sterile neutrinos present in the supersymmetric inverse seesaw could significantly weaken the constraints on the mass and couplings of a light CP-odd Higgs boson.
48
Käfer, Florian [Verfasser], and Seema [Akademischer Betreuer] Agarwal. "New non-ionic polymers with UCST-type and complex phase transition behavior / Florian Käfer ; Betreuer: Seema Agarwal." Bayreuth : Universität Bayreuth, 2019. http://d-nb.info/1190170752/34.
49
Karakaya, Seema [Verfasser], Birgit [Gutachter] Donner, and Frank [Gutachter] Pillekamp. "Analyse der Lebersteifigkeit mittels Fibroscan bei Patienten mit univentrikulären Herzen / Seema Karakaya ; Gutachter: Birgit Donner, Frank Pillekamp." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2017. http://d-nb.info/1142000443/34.
50
Benuzzi, Giulio. "Studio di un approccio multivariato per la ricerca di leptoni pesanti con l'esperimento ATLAS a LHC." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/19154/.
Анотація:
La massa dei neutrini, non prevista dal Modello Standard, è una diretta evidenza dell’esistenza di nuova fisica ancora da scoprire.
Il meccanismo Seesaw di tipo III è un’estensione del Modello Standard e fornisce una spiegazione naturale della massa dei neutrini tramite l’introduzione di un tripletto leptonico
scalare (L+-;N0) . Si stanno effettuando numerosi studi che permettono di fissare dei limiti sempre più precisi sulla massa di queste particelle esotiche, con la speranza di osservarne traccia nei più potenti acceleratori attualmente esistenti.
Il lavoro compiuto in questa tesi si pone come obiettivo quello di approcciare questo procedimento di ricerca di nuova fisica tramite algoritmi di analisi multivariata, per ottimizzare la discriminazione tra segnale e fondo. Lo studio è stato effettuato sul processo
pp -> W*,Z*,gamma* -> L+-N0 ! W-+ l+- Z ni usando simulazioni Monte Carlo di dati raccolti dal rivelatore ATLAS. Si è scelto questo canale di decadimento perché interessato da
molti processi di fondo del Modello Standard.
L’analisi multivariata si pone come scopo quello di discriminare gli eventi di segnale da quelli di fondo, tramite diversi algoritmi di analisi. Per questo elaborato si sono studiate le prestazione di diversi algoritmi di analisi da cui si è ricavato il migliore in
base all’efficienza di riconoscimento degli eventi di segnale e alla reiezione degli eventi di fondo. Per questo elaborato l’algoritmo prescelto è una rete neurale Multilayer Perceptron che ha consentito di ottenere una significanza del segnale sul fondo nella Signal Region prescelta pari a:
S = 3.04;
che confrontata con la significanza ottenuta dal metodo di analisi Cut and Count, evidenzia il potere discriminante dell’analisi multivariata.