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Dissertations / Theses on the topic 'Secteur sombre'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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1

Breton, Michel-Andrès. "Constructing observables in cosmology : towards new probes of the dark sector." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC023/document.

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La nature de l’énergie noire et de la matière noire est encore un mystère. De futures missions spatiales nous permettrons d’observer les propriétés et la distribution de milliards de galaxies mais quelle est la meilleure manière de contraindre la physique de ces composantes inconnues avec une telle quantité de données ? Le but de cette thèse est de chercher de nouvelles sondes du secteur sombre de l’univers dans le régime linéaire et non-linéaire de la formation des structures. La physique du secteur sombre laisse des empreintes dans la distribution des grandes structures à un temps donné (esp

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2

Leloup, Clément. "Contraintes expérimentales sur des modèles avec champ scalaire léger dans le secteur sombre en cosmologie et physique des particules." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS303/document.

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Les travaux présentés dans cette thèse contraignent les paramètres d'un modèle de cosmologie, le modèle du galileon, et d'un modèle de physique des particules, le modèle du branon, qui sont des extensions des modèles standards. Ces modèles, qui supposent l'existence d'un champ scalaire additionnel et peuvent trouver leurs origines dans les théories à dimensions supplémentaires, offrent des explications élégantes aux questions de la nature de l'énergie noire et de la matière noire respectivement. La première partie de cette thèse présente les prédictions du modèle du galileon et les résultats o

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3

Simonyan, Ani. "Dark Photon Search with the HPS Experiment at JLab." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS561/document.

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L'expérience HPS (Heavy Photon Search) au Jefferson Lab (USA)recherche un nouveau boson de jauge vecteur, nommé "photon lourd" ou "photon sombre", dans une fourchette de masse allant de 20 à 1000 MeV. Une telle particule couplerait avec le photon du modèle standard par effet de "kinetic mixing" et pourrait ainsi être émis par l'intermédiaire d'électrons. En utilisant un faisceau d'électron de haute intensité d’un à six GeV envoyé sur une cible de tungstène, HPS cherche à détecter une fine résonance dans le bruit de fond produit par les processus QED qui serait la signature d'un photon lourd. H

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4

Capela, Fabio. "Black holes and the dark sector." Doctoral thesis, Universite Libre de Bruxelles, 2014. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209310.

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This thesis is divided in two parts: the first part is dedicated to the study of black hole solutions in a theory of modified gravity, called massive gravity, that may be able to explain the actual stage of accelerated expansion of the Universe, while in the second part we focus on constraining primordial black holes as dark matter candidates.<p><p>In particular, during the first part we study the thermodynamical properties of specific black hole solutions in massive gravity. We conclude that such black hole solutions do not follow the second and third of law of thermodynamics, which may signa

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5

Hirn, Johannes. "Formulation de la théorie effective à basse énergie du secteur électrofaible sans particule de Higgs." Paris 11, 2004. https://tel.archives-ouvertes.fr/tel-00008357.

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La théorie effective à basse énergie du secteur électrofaible sans particule de Higgs utilise les méthodes de la Théorie de Perturbation Chirale. La formule de comptage de Weinberg montre la cohérence du développement en boucles, avec la renormalisation correspondante. En revanche, on trouve que certains opérateurs effectifs, supprimés par une échelle de masse dans le cas du Modèle Standard, ne le sont plus dans le cas sans Higgs. De plus, ils apparaissent à l'ordre dominant du développement chiral, en conflit avec les expériences. Pour décrire leur suppression, on demande l'invariance sous la

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6

Robbins, Paul Anthony. "Information technology in the financial service sector : some geographical implications." Thesis, University of Leeds, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442189.

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7

Dlakwa, Mohammed Musa. "Analysis of some problems in the management and cost control of public sector construction projects in Nigeria." Thesis, University of Stirling, 1990. http://hdl.handle.net/1893/2144.

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Development is a difficult, painful and long-term enterprise. Not only because of world wide social and economic changes with extensive debts problems, inflation, recession and slow growth, but it is also a matter of finding the technically and economically optimum solution. Over the long-term, the challenge for developing countries is to use their limited resources more efficiently and more equitably through the management of all investment outlays in both the public and private sector. Construction is a major investment sector in Nigeria, attracting an average of over 60% of all capital inve

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8

Ibraheem, Amr Ameen Alee. "The economic and social efficiency of the Egyptian vehicles industry and some of its selected public sector auxiliary units." Thesis, University of Sussex, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276735.

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9

Iredale, Alison. "In pursuit of professional knowledge and practice : some experiences of lifelong learning sector trainee teachers in England 2008-10." Thesis, University of Huddersfield, 2015. http://eprints.hud.ac.uk/id/eprint/26227/.

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This thesis explores the participation of student teachers during their part time in-service initial teacher education course based on the campus of a higher education institution in the North West of England. It investigates the extent to which initial teacher education prepares teachers as professional practitioners in the lifelong learning sector. The research was conducted in a university campus forming part of a higher education institution, using a qualitative, reflexive methodology. The data is derived from naturally-occurring class discussions, a range of course-related artefacts and s

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10

Hostert, Marc. "Stratégie d’internationalisation d’une Petite Economie Mature Ouverte (PEMO) : le cas du Luxembourg : déterminants, défis et leviers." Thesis, Paris, CNAM, 2013. http://www.theses.fr/2013CNAM0905/document.

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L’attractivité des territoires vis-à-vis des investissements directs étrangers constitue, avec l’ouverture accrue des espaces économiques et politiques, un élément clé de l’intensification des flux d’échanges et d’investissements.Pour tous les pays et, plus particulièrement, pour ceux ne disposant pas d’un marché national important, l’établissement d’un diagnostic d’attractivité et la détermination d’axes prioritaires de développement constituent une démarche fondamentale applicable particulièrement à l’exemple du Luxembourg, une économie considérée comme une petite économie mature ouverte (PE

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11

Martineau, Killian. "Quelques aspects de cosmologie et de physique des trous noirs en gravitation quantique à boucles Detailed investigation of the duration of inflation in loop quantum cosmology for a Bianchi I universe with different inflaton potentials and initial conditions Some clarifications on the duration of inflation in loop quantum cosmology A first step towards the inflationary trans-Planckian problem treatment in loop quantum cosmology Scalar spectra of primordial perturbations in loop quantum cosmology Phenomenology of quantum reduced loop gravity in the isotropic cosmological sector Primordial Power Spectra from an Emergent Universe: Basic Results and Clarifications Fast radio bursts and the stochastic lifetime of black holes in quantum gravity Quantum fields in the background spacetime of a polymeric loop black hole Quasinormal modes of black holes in a toy-model for cumulative quantum gravity Seeing through the cosmological bounce: Footprints of the contracting phase and luminosity distance in bouncing models Dark matter as Planck relics without too exotic hypotheses A Status Report on the Phenomenology of Black Holes in Loop Quantum Gravity: Evaporation, Tunneling to White Holes, Dark Matter and Gravitational Waves." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY044.

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Cantonnée à la physique mathématique depuis des décennies, la gravitation quantique entre désormais dans le giron de la science expérimentale. Suivant cette mouvance nous considérons dans cette thèse trois cadres d’application de la gravitation quantique à boucles (LQG) : le système Univers, les trous noirs et les astroparticules. Le troisième n’est qu’esquissé tandis que les deux premiers sont présentés plus en détails.Le secteur cosmologique étant l’un des domaines les plus prometteurs pour tester et contraindre des théories de gravité quantique, le développement de différents modèles tentan

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12

Kim, Junki. "State-owned enterprise sector reform and privatization theory and some evidence from Korea /." 1996. http://catalog.hathitrust.org/api/volumes/oclc/36846929.html.

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13

Cumming, Dick Brownlee. "The determination of some factors influencing channel change in the agricultural machinery sector." Thesis, 2015. http://hdl.handle.net/10539/17014.

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This report reviews some of the literature on marketing channels, the relationships that exist within them and their management under various marketing strategies. The literature suggests that as distribution strategies tend towards exclusive dealing, that is, where dealers are given exclusive rights to distribute the manufacturer's products, the manufacturer can expect better customer service and a more aggressive selling effort. Two types of channels are used by Slattery (Ltd.), a South African manufacturer of maize harvesting machinery. These are agricultural c o operatives and tra

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14

"Estimates of the informal economy in South Africa: some macroeconomic policy implications." Thesis, 2008. http://hdl.handle.net/10210/653.

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This study estimates the size of the informal economy in South Africa, evaluates the macroeconomic implications of this, and then concludes with possible effects that all of this might have on policy. The research is conducted as a South African case study, and uses time-series analysis for the period 1966-2002. Recently there has been a revival of interest in the informal economies of a number of countries. The revival has been driven largely by an increase in the size of informal economies, in both absolute and relative terms. South Africa is no exception to this trend: more and more people

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15

Correia, Ricardo Jorge de Castro. "A proactive and entrepreneurial international market approach: Some evidence in the Portuguese hotel sector." Doctoral thesis, 2012. http://hdl.handle.net/10071/6724.

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Internationalization is a process of such complexity that its explanation, in terms of one single theoretical perspective is difficult. Drawing on a comprehensive multi-case study, this doctoral thesis explores the influence environmental and organizational stimuli as determinants of Portuguese hotel firms’ international engagement. It also proposes to understand the linkage between the antecedent firm motivational stimuli factors with, time of entry, market selection and entry mode strategies. The strategy regarding the epistemological position is via a deductive research approach, whe

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16

Ko, Ming-lung, and 柯明隆. "Examining the Relationship between Cooperative Capacities and NPD Project’s Advantages in Taiwanese ODM/OEM IT Sector: A Perspective of Some Moderating Effects." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/64099438597283239685.

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碩士<br>國立高雄第一科技大學<br>行銷與流通管理所<br>91<br>Porter (1990) points that innovation grows out of pressure and challenge, and the key issue of success is decided by group cooperation and competition in the knowledge-based economics. In recent years, because of the great attraction of China low-Labor market, Taiwanese manufacturing firms broadly invest in Mainland China to reinforce their international competitiveness so as to invite more international OEM/ODM projects. Not only does international IT companies continue procuring majority of their IT products from Taiwan, but also set up the R&D centers h

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