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1
Dorigo, Mirco. « Search for New Physics in the Bs -> ; J/psi phi and Bs -> ; phi phi decays at CDF ». Doctoral thesis, Università degli studi di Trieste, 2013. http://hdl.handle.net/10077/8586.
Texte intégralRésumé :
2011/2012We present a search for physics beyond the standard model (SM) through a measurement of the violation of the charge-parity (CP) symmetry in two decays of the Bs meson using data collected by the Collider Detector at Fermilab (CDF) in proton-antiproton collisions at the center-of-mass energy of 1.96 Tev. We exploit the decays Bs->Jpsi (->mu mu) phi(-> KK) and Bs -> phi(-> KK) phi(-> KK), for which the SM accurately predicts very small or vanishing CP violation; both decay modes are very sensitive to new sources of CP violation expected in a broad class of SM extensions. We analyze the time-dependent CP asymmetry of the Bs->Jpsi phi decays collected in the full CDF Run II dataset for providing the final measurement of the Bs-antiBs mixing phase, 2*betas, and we present the first measurement of CP violation in Bs -> Phi Phi decays, through the determination of two time-integrated CP asymmetries, Av and Au, using an original method developed in this work. We find: -0.06< betas<0.30 at the 68% confidence level; Av=(-12.0 +/-6.4(stat) +/- 1.6(syst))%; and Au=(-0.7 +/-6.4(stat) +/- 1.8(syst))%. In addition, we provide measurements of the decay width difference between the light and heavy mass eigenstates of the Bs meson, DeltaGamma_s=0.068 +/- 0.026(stat) +/- 0.009(syst) ps^{-1}; and of their mean lifetime, tau_s=1.528 +/- 0.019(stat) +/- 0.009(syst) ps. All results are among the most precise determinations from a single experiment and exhibit an excellent agreement with the SM predictions. They have been published in two letters in Physical Review.
XXV Ciclo
1985
2
Di, Ruzza Benedetto. « Measurement of the branching ratio of the charmless decay Bs to phi phi at CDF II ». Doctoral thesis, Università degli studi di Trieste, 2009. http://hdl.handle.net/10077/3059.
Texte intégralRésumé :
2007/2008We present a study of the charmless Bs to phiphi decay performed with the CDFII detector at the Fermilab Tevatron Collider. Charmless Bs meson decays currently can be studied only at the Tevatron and represent a field still to be fully explored that offers additional ways to test our present theoretical understanding. The Bs to phiphi belongs to a particular class of these decays: the Bs meson decays into a pair of vector particle and the final state is self-conjugate. It can be used to measure the Bs decay width difference (Delta Gamma_s), CKM studies, and tests of decay polarization predictions.
XXI Ciclo
1968
3
Engel, Günther. « Charakterisierung regulatorischer genetischer Elemente des temperenten Lactobacillus gasseri Bakteriophagen phi adh / ». [S.l. : s.n.], 1999. http://www.gbv.de/dms/bs/toc/270837132.pdf.
Texte intégral
4
Linn, Christian [Verfasser], et Ulrich [Akademischer Betreuer] Uwer. « Measurement of the CP-violating phase phis using Bs->J/Psi Phi and Bs->J/Psi pi+pi- decays with the LHCb experiment / Christian Linn ; Betreuer : Ulrich Uwer ». Heidelberg : Universitätsbibliothek Heidelberg, 2013. http://d-nb.info/1177248808/34.
Texte intégral
5
Langenbruch, Christoph [Verfasser], et Ulrich [Akademischer Betreuer] Uwer. « Measurement of the Bs mixing phase in the decay Bs -> ; J/psi phi with the LHCb experiment / Christoph Langenbruch ; Betreuer : Ulrich Uwer ». Heidelberg : Universitätsbibliothek Heidelberg, 2011. http://d-nb.info/1179782607/34.
Texte intégral
6
Maurice, Emilie. « Mesure de la violation de CP dans les désintégrations Bs -> ; J/psi phi auprès du détecteur LHCb ». Phd thesis, Aix-Marseille Université, 2012. http://tel.archives-ouvertes.fr/tel-00742181.
Texte intégralRésumé :
La mesure de la phase phis violant la symétrie CP dans les désintégrations Bs -> J/psi phi est une des analyses phares de l'expérience LHCb. Le Modèle Standard prédit cette observable avec une faible incertitude théorique. La présence de Nouvelle Physique notamment dans les diagrammes en boucle de l'oscillation Bs - anti Bs peut significativement modifier la mesure de cette phase. Durant cette thèse, nous avons participé à différents aspects de l'analyse des désintégrations Bs -> J/psi phi. Nous avons proposé une sélection multi-variables, basée sur un algorithme d'arbres de décision boostés. Cette nouvelle sélection augmente le nombre de signal Bs -> J/psi phi de 19% mais nécessite une correction temporelle. Une étude portant sur l'origine des distorsions angulaires caractéristiques des désintégrations Bs -> J/psi phi a aussi été menée. Il s'avère que la principale source de distorsion est la géométrie du détecteur LHCb. Nous avons aussi contribué à un autre élément clef de cette analyse : l'étiquetage de la saveur. Afin de connaître la saveur initiale des mésons B, un algorithme d'étiquetage a été développé. Il exploite les traces chargées provenant du hadron B de côté opposé. Nous avons participé à son optimisation ainsi qu'à son étalonnage en étudiant les désintégrations Bd -> J/psi K*. En utilisant l'intégralité des données enregistrées en 2011, soit 1 fb-1, après optimisation et calibration de cet algorithme, la puissance d'étiquetage dans le canal Bs -> J/psi phi est : (2.29 +- 0.07 +- 0.26) %. La valeur de phis mesurée est alors : \phis = -0.001 +- 0.101 +- 0.027 rad dans les désintégrations Bs -> J/psi phi. L'analyse combinée de Bs -> J/psi phi avec les désintégrations Bs -> J/psi \pi+ \pi- donne la meilleure mesure mondiale de \phis = -0.002 +- 0.083 +- 0.027 rad. Cette mesure est compatible avec le Modèle Standard, mais ses incertitudes laissent possible la présence de Nouvelle Physique.
7
Taran, A. « Number Phi ». Thesis, Сумський державний університет, 2014. http://essuir.sumdu.edu.ua/handle/123456789/35106.
Texte intégralRésumé :
Fibonacci is one of the most famous names in mathematics. This would come as a surprise to Leonardo Pisano, the mathematician we now know by that name. And he might have been equally surprised that he has been immortalised in the famous sequence – 0, 1, 1, 2, 3, 5, 8, 13, ... – rather than for what is considered his far greater mathematical achievement – helping to popularise our modern number system in the Latin-speaking world.
When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35106
8
Khanji, Basem. « Recherche de nouvelle physique dans le canal B⁰ → J/ψφ auprès de l’expérience LHCb ». Thesis, Aix-Marseille 2, 2011. http://www.theses.fr/2011AIX22064.
Texte intégralRésumé :
Dans le Modèle Standard, la différence de phase apparaissant dans la désintégration B0s --> J/psi phi est prèdite avec une grande précision. Cette observable est une sonde pour mettre en évidence de la Nouvelle Physique car l’oscillation B0s -B0sbar s’effectue via un diagramme en boucles sensible à la nouvelles particules. Nous avons développé une sélection simplifiée pour les données de 2010. Elle évite tous biais sur la distribution en temps propre afin de réduire l’incertitude systématique. De plus, nous contrôlons les performances d’étiquetage pour les événements B0s --> J/psi phi en utilisant les canaux similaires B0d--> J/psi K*0 et B+ --> J/psi K+. Avec les données de 2010, nous obtenons 570 événements de signal avec une luminosité intégré de 36 pb−1, une puissance de d’étiquetage de (2, 2 ± 0, 4)% et une résolution temporelle de 50 fs. Nous avons étudié une sélection alternative, qui maximise la sensibilité à la phase phis en utilisant des coupures biasant le temp propre. Nous avons proposé une méthode pour corriger la déformation de temps propre à partir des données. Nous avons développé un programme d’ajustement pour déterminer la phase phis. Avec les données 2010, la valeur touvée est phis = [−2, 7,−0, 5] rad à 68% de confiance. Ce résultat est compatible avec la prédiction du Modèle StandardIn the PsB $to$ PJpsi $phi$ channel, the phase difference phis between decays with and without oscillation is predicted to be significantly small in the SM. Furthermore, the PsB-PasB mixing phenomena takes place via a loop diagram. These two reasons makes the phis parameter an excellent probe for New Physics processes. We developed a simplified selection for the 2010 data. It avoids any bias on the proper time distribution in order to reduce systematic uncertainty. In addition, we control the tagging performance for PsB $to$ PJpsi $phi$ events using the similar $PBdtoPJpsiPKstar^0$ and $PButoPJpsiPKplus$ channels. With the 2010 data, we obtain $570$ signal events in $36invpb$ of integrated luminosity, a tagging power of $(2.2pm 0.4)%$ and a proper time resolution of $50fs$. We investigated an alternative selection which is designed to maximize the phis sensitivity using a proper time biasing cuts. We proposed a data-driven method to correct the proper time acceptance. We designed a fitting program to determine the phis phase. Using fast Monte Carlo simulation we validated the fitter program, determine the LHCb sensitivity to the phis phase and advise the use of interval estimate at low signal yield. We reviewed the first determination of the phis phase by the LHCb collaboration. It is found to be: $phis in [-2.7,-0.5] rad ~ {rm at~68%~CL}$. This result is compatible with the Standard Model prediction
9
Leopold, Teresa Ingeborg, et n/a. « The construction of a disaster destination : rebuilding Koh Phi Phi, Thailand ». University of Otago. Department of Tourism, 2008. http://adt.otago.ac.nz./public/adt-NZDU20080430.100246.
Texte intégralRésumé :
The popular tourist destination island of Koh Phi Phi Don, Thailand was heavily affected by the Indian Ocean Tsunami in December 2004, which resulted in a destroyed tourism infrastructure and complete downturn of tourism. Extensive recovery and rebuilding work by emerging community groups, returned locals, international volunteers and Thai government units provided an efficient but hasty reconstruction of the destination. Ethnographic research conducted in the community provided insights into the complex stakeholder interactions and their roles and influences on the reconstruction of the community.
The community�s level of vulnerability on Koh Phi Phi Don was influenced by social processes and interactions during the destination�s recovery process as the various stakeholders (e.g. government vs. locals) had differing perceptions of the island�s economic, environmental and social vulnerability. These disputes are grounded in different social time processes, particularly illustrated through land law disputes among locals, landowners and the government. Other factors which influenced the reconstruction of Koh Phi Phi as a tourist destination were pre-tsunami conditions (past overdevelopment), the empowerment of the community, the reconstructed place identity, various anniversary celebrations and the early warning system.
A model is suggested to illustrate and discuss Koh Phi Phi Don as a disaster destination, which provides insights into the dynamics which govern a destination�s post-disaster recovery period. Thus, it illustrates how stakeholder interaction is influenced by distinct understandings of the multiple notions of vulnerability. Furthermore, this study establishes essential links between disaster and tourism theories and suggests an extended tourism disaster management framework, which calls for an inclusion of post-recovery processes.
10
Taylor, Faye. « Post disaster tourism development of Phi Phi Island : political economy and interpretations of sustainability ». Thesis, University of Bedfordshire, 2012. http://hdl.handle.net/10547/280053.
Texte intégralRésumé :
This research takes an interdisciplinary approach and includes aspects of applied geography, applied management, political economy, development studies, sociology and anthropology, in line with the tradition of progressive tourism studies. It seeks to resolve academic concern about the limited insight within existing bodies of knowledge into how sustainability and sustainable tourism development are conceptualised at a grassroots level by inhabitants and other stakeholders of tourism destinations (Redclift, 1987; Liu, 2003; Swarbrooke, 1999; Mowforth and Munt, 1998; Maida, 2007) and furthermore how these conceptualisations are shaped through expressions of political economy in a post-crisis context. The research aimed to evaluate how political economy and interpretations of sustainability affected post-disaster tourism redevelopment using the case study of Phi Phi Island in Thailand, which was devastated by the tsunami of December 2004. An interpretive philosophy informed the research design, in which primary data was gathered using an inductive mixed methodology. Methods included online research, comprising the design and operation of a tailored website to overcome geographical and access limitations; and offline methods such as visual techniques to monitor change and confirm opinions offered by participants of the research; in-depth face-to-face interviews with hand-picked stakeholders of Phi Phi's development; open-ended questionnaires with tourists; and extended answer Thai script questionnaires in order to overcome language barriers and present the 'Thai voice'. The primary data was gathered from April 2006-December 2011 including a period working at [information removed for anonymity purposes] University in Phuket (June-December 2006). Twenty-five themes emerged from the data, the most significant being the social impacts of tourism, environmental impacts of tourism, power relationships and future desires. It was found that the factor with the greatest influence over Phi Phi's development is the desire to develop the economy through tourism, and the philosophy underpinning the development is largely economic. The tsunami did not cause any significant reassessment of the tourism development trajectory, but served to uncover a range of conflicts and unlawful activity, resulting from powerful stakeholders pursuing their own interests and desired outcomes, in order to suit their own needs rather than those of the community as a whole. In terms of how sustainability is conceptualised by different stakeholder groups, it was found that the meanings attributed to sustainability in this context differ greatly to meanings elaborated within western ideological debates. Stakeholders' conceptualisations of sustainability were mapped against key debates within literature. How meanings differed between stakeholder groups was also examined and a definition for sustainable tourism development on Phi Phi was compiled encompassing a broad range of interests. The thesis provides a rare opportunity to see which political, economic and cultural factors shape the planning of tourism development and whether actual practice mirrors the principles of sustainability. For islanders, present needs are yet to be met and education was recommended to increase islanders' understanding of impacts and sustainability, as well as their skills and knowledge base to enable them to compete intellectually with the ruling elite and reduce dependence upon landowners and the mainland. Numerous authors have highlighted a relative lack of academic attention directly addressing the influence of political economy on achieving sustainability in post-disaster reconstruction (Klein, 2008; Hystad and Keller, 2008; Olsen, 2000; Bommer, 1985; Beirman, 2003; Faulkner, 2001; Glaesser, 2003; Ritchie, 2004). This work therefore extends existing academic debates and studies in a number of areas. In existing academic debates concerning the political economy of post-disaster reconstruction there is a trend towards 'disaster capitalism' (Klein, 2005: 3) or 'smash and grab capitalism' (Harvey, 2007: 32) and 'attempts to accumulate by dispossession' (Saltman, 2007a: 57). However, this did not occur on Phi Phi. Despite claims of a 'clean slate' being offered by the tsunami in developmental terms (Pleumarom, 2004; UNDP, 2005; Dodds, 2011; Ko, 2005; Nwankwo and Richardson, 1994; Argenti, 1976; Rice, 2005; Altman, 2005; Brix, 2007; Ghobarah et al., 2006; Dodds et al., 2010), this research provides evidence and explanation of why this did not and would never exist on Phi Phi, a finding that may be applied to other destinations in a post-disaster context. In response to Blaikie et al.'s (2004) concerns that vulnerability is often reconstructed following a disaster and may create the conditions for a future disaster, this work has extended discussions of disaster vulnerability through an adapted application of Turner et al.'s (2003) Vulnerability Framework. This meets Calgaro and Lloyd's (2008) recommendation that further longitudinal research is required in other tsunami-affected locations. This research refines their work to identify a detailed framework of vulnerability factors intertwined with factors of political economy, presenting a post-disaster situation that remains highly vulnerable and non-conducive to sustainability. This is in response to Hystad and Keller's (2008) recognition that there is a lack of long-term studies, which not only show how disaster has shifted the nature of the destination and tourism product, but also identify successful strategic processes and actions in disaster response. The strategic response has been analysed through an adapted Strategic Disaster Management Framework (Ritchie, 2004) to identify the shortcomings of the disaster response to comprehend how such a disaster has influenced tourism development and planning on the island, showing that this was a mirror opposite to how a disaster should be handled according to the literature (Ritchie, 2004; Adger et al., 2005; Miller et al., 2006; Olsen, 2000; Coppola, 2007; Faulkner, 2001; Baldini et al., 2012). The researcher draws on the notion of 'strategic drift' (Johnson, 1998: 179) and 'boiled frog syndrome' (Richardson, Nwankwo and Richardson, 1994: 10) to explain how host attitudes to tourism may increase vulnerability. Both these contributions can assist in identifying destination vulnerability and limitations in disaster response and recovery. Unlike the work of Dodds (2010) and Dodds et al. (2011), the aim was not to assess the practice and attainment of sustainability on Phi Phi; rather, it was to elaborate interpretations and conceptualisations of sustainability. An examination of development philosophy established how specific factors of political economy and relationships of a hegemonic nature influence the development trajectory of both Phi Phi and Thailand. Despite governmental rhetoric influenced by a strong 'sufficiency economy' hegemony led by King Bhumibol Adulyadej, the observations of dependency theorists provide a better fit for the experiences on Phi Phi and present significant challenges for the pursuit of sustainability. The thesis posits that an effective response to the disaster and pursuit of sustainability are undermined by the political economy of the destination.
11
Mas, Pons Jordi. « Síntesi i aplicació de phi-dipèptids amb estructura de 3 aminopiperidona. Síntesi de phi-melanotans ». Doctoral thesis, Universitat de Barcelona, 2010. http://hdl.handle.net/10803/51338.
Texte intégralRésumé :
Els melanotans son pèptids derivats de la hormona melanotropínica (alfa-MSH). Aquesta forma part del sistema melanocortínic, juntament amb altres hormones com la ACTH, la beta-MSH o la gamma-MSH entre d’altres. Els pèptids melanocortínics presenten una mateixa seqüència central basada en els residus de His3-Phe4-Arg5-Trp6 que és la seqüència activa dels pèptids. Aquests, realitzen les seves funcions per interacció amb 5 receptors melonocortínics que es troben ampliament distribuïts per l’organisme. Amb anterioritat a aquest treball, s’havien sintetitzat una gran quantitat de pèptids derivats de la hormona alfa-MSH. Concretament la substitució de la Met de la posició 4 per Nle i la recemització de la Phe de la posició 7 en D-Phe van conduir a la síntesi del Melanotan-1 (MT1) un tridecapèptid linear el qual mostrava una millor estabilitat metabòlica i una activitat més potent quan es comparava amb la hormona model però que era poc selectiu per cap dels receptors de melanocortina humans. Per tal de restringir la conformació de l’MT1 i fer-lo més selectiu, el grup del Prof. Hruby de la Universitat d’Arizona va sintetitzar l’heptapèptid cíclic Melanotan-2 (MT2) el qual era molt més potent que MT1 però que com aquest va resultar ser poc selectiu. Degut a aquesta manca de selectivitat, és d’una importancia capital trobar lligands per a cadascun d’aquests receptors per tal de poder determinar el paper fisiològic que té cadascun d’ells.
Així, la present tesi doctoral té per objectiu el disseny i la síntesi de pseudomelanotans a partir del pèptid model MT2 per tal de millorar-ne la selectivitat per a un determinat receptor. L’MT2 és un cicloheptapèptid que presenta un gir beta centrat en els residus d’His3-D-Phe4 i una ciclació per la cadena lateral dels residus d’Asp2 i Lys7. Treball previs d’altres autors s’han centrat sobretot en modificar la part activa de la molècula, mentre que en el present treball ens volem centrar en la part flexible per tal de no alterar-ne la seva activitat.
En primer lloc, per tal de rigidificar la zona flexible de l’MT2 es va dur a terme la síntesis de diferents estructures pseudopeptídiques rígides: el lactam 13, la oxazolopiperidona 15 i els diazanorbornans 101b, 108 i 114 i el diazanorborné 115. Posteriorment, es descriu la incorporació d’aquestes estructures rígides en els pseudomelanotans derivats d’MT2 per síntesi peptídica en fase sòlida. Els pseudomelanotans obtinguts es poden classificar en 3 grups:
a) Els compostos 13 i 108 es fan servir per substituir el Trp, donat que aquest es troba just al costat del gir beta. D’aquesta manera se sintetitzen els pèptids 120 i 121a i 121b.
b) L’oxazolopiperidona 15 al ser un mimètic de gir beta es fa servir per substituir els redidus centrals del gir beta (His3-D-Phe4) per tal d’obtenir el pseudomelanotan 122.
c) Pseudomelanotans en que la part flexible de la molècula ha estat modificada.
D’aquesta manera s’obtenen els pseudopèptids 123, 124, 125 i 126 al modificar la Lys7
per l’oxazolopiperidona 15, els diazanorbornans 101b i 114 o pel diazanorbornè 115. Finalment, un cop sintetitzats els derivats d’MT2 van ser sotmesos a estudis de RMN. Aquesta tècnica és particularment útil ja que permet determinar la formació d’enllaços d’hidrogen, les distàncies interprotòniques i els angles diedres. A més a més, les dades ens serveixen com a restriccions per a càlculs de modelització molecular. Destaquen els resultats obtinguts pel compost 121a el qual manté el gir beta present en el compost model i a més a més mostra un gir complementari. En el cas dels pèptids 122 i 123 que inclouen l’oxazolopiperidona 15 en la seva estructura i de l’azapèptid 120 també s’observa un restricció conformacional respecte al model.Alpha-melanocyte stimulating hormone (alpha-MSH) is a linear tridecapeptide which plays a role in a wide range of biological responses like feeding behaviour, pain modulation, sexual function, energy homeostasis and thermoregulation. The principal pharmacophore groups of alpha-MSH were found to be the side chains of the central tetrapeptide His-Phe-Arg-Trp. Since the discovery of alpha-MSH, numerous linear analogues of native alpha-MSH have been synthesized to enhance melanotropic potency. Hence, substitution of the Nle for Met at the 4-position and racemization to D-phenylalanine at the 7-position led to Melanotan-1 (MT1) which showed enhanced metabolic stability and improved potency compared with alpha-MSH. In order to constrain MT1, the group of Prof. Hruby synthesized the cyclic heptapeptide MT2 which was a very potent but non-selective agonist for the human melanocortin receptor subtypes MC1R, MC3R, MC4R and MC5R. Because of the lack in selectivity, finding selective ligands for each of the receptors is crucial for the determination of their individual physiological roles. The aim of the present work is the design and synthesis of a collection of phimelanotans to improve their biological properties with respect to MT2. First of all, we have prepared several constrained pseudodipeptides (lactam 13, diazanorbornanes 101b and 108) or -turn mimics (oxazolopiperidone 15, diazanorbornane 114 and diazanorbornene 115) to replace native residues of MT2. Then, we describe the synthesis of the phi-melanotans incorporating our constrained scaffolds by SPPS. Three types of phi-melanotans are obtained: a) Compounds 120, 121a and 121b with modification of the active part of the molecule. b) Pseudopeptide 122 is obtained by substitution of oxazolopiperidone 15 for the central residues of the beta-turn (His3-D-Phe4). c) Pseudomelanotans 123, 124, 125 and 126 are prepared by modification of the flexible part of the model peptide. Finally, we have demonstrated by NMR studies that incorporation of our constrained scaffolds led to the formation of conformational constrained pseudopeptides.
12
Ussery, Cherlon. « Case and Phi Features as Probes ». University of Arizona Linguistics Circle, 2012. http://hdl.handle.net/10150/253428.
Texte intégralRésumé :
This paper uses case and agreement patterns to argue for a reformulation of Agree (Chomsky 1995, 2000, 2001). Throughout syntactic literature, various proposals that account for the assignment of case and agreement have been made. Chomsky (1991) proposes that different projections are responsible for the two types of features. Case is assigned in Spec,TP, while agreement is established in Spec,AgrP. By contrast, Agree divorces feature checking from movement (Bobaljik and Wurmbrand 2005, Wurmbrand 2006). Case and agreement are assigned under c-command via the same Agree operation. A head, T, checks the case of a DP with a matching case feature and, in turn, that DP checks the agreement features on T. The prediction, therefore, is that case and agreement should necessarily pattern together: verbs should agree with DPs that are in a case relationship with T. I provide evidence not only that case and agreement features may pattern differently, but also that individual agreement features may pattern differently. As such, I argue that features on heads – not heads themselves – are probes. While I argue that case and phi features are not an indivisible bundle, I maintain the proposal that feature-checking need not force movement to a specifier, thus eliminating the need for independent agreement projections. Additionally, I illustrate probing is not restricted to c-command. I redefine Agree so as to allow a probe-goal relation to be established either under c-command or in a spec-head configuration.
13
Tse, Lai-yin. « Identification of a novel PHI receptor in goldfish Carassius Auratus : implications of conservation of PHI structure in vertebrates / ». Click to view the E-thesis via HKUTO, 1999. http://sunzi.lib.hku.hk/hkuto/record/B42575357.
Texte intégral
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Viebke, André. « Accelerated Deep Learning using Intel Xeon Phi ». Thesis, Linnéuniversitetet, Institutionen för datavetenskap (DV), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-45491.
Texte intégralRésumé :
Deep learning, a sub-topic of machine learning inspired by biology, have achieved wide attention in the industry and research community recently. State-of-the-art applications in the area of computer vision and speech recognition (among others) are built using deep learning algorithms. In contrast to traditional algorithms, where the developer fully instructs the application what to do, deep learning algorithms instead learn from experience when performing a task. However, for the algorithm to learn require training, which is a high computational challenge. High Performance Computing can help ease the burden through parallelization, thereby reducing the training time; this is essential to fully utilize the algorithms in practice. Numerous work targeting GPUs have investigated ways to speed up the training, less attention have been paid to the Intel Xeon Phi coprocessor. In this thesis we present a parallelized implementation of a Convolutional Neural Network (CNN), a deep learning architecture, and our proposed parallelization scheme, CHAOS. Additionally a theoretical analysis and a performance model discuss the algorithm in detail and allow for predictions if even more threads are available in the future. The algorithm is evaluated on an Intel Xeon Phi 7120p, Xeon E5-2695v2 2.4 GHz and Core i5 661 3.33 GHz using various architectures and thread counts on the MNIST dataset. Findings show a 103.5x, 99.9x, 100.4x speed up for the large, medium, and small architecture respectively for 244 threads compared to 1 thread on the coprocessor. Moreover, a 10.9x - 14.1x (large to small) speed up compared to the sequential version running on Xeon E5. We managed to decrease training time from 7 days on the Core i5 and 31 hours on the Xeon E5, to 3 hours on the Intel Xeon Phi when training our large network for 15 epochs
15
Le, Borgne Jérémy. « Représentations galoisiennes et phi-modules : aspects algorithmiques ». Phd thesis, Université Rennes 1, 2012. http://tel.archives-ouvertes.fr/tel-00720023.
Texte intégralRésumé :
Nous nous intéressons aux aspects algorithmiques de la théorie des représentations modulo p de groupes de Galois p-adiques. À cet effet, l'un des outils introduits par Fontaine est la théorie de ϕ-modules : un ϕ-module sur un corps K de caractéristique p est la donnée d'un espace vectoriel de dimension finie sur K muni d'un endomorphisme ϕ, semi-linéaire par rapport au morphisme de Frobenius sur K. Les représentations à coefficients dans un corps fini du groupe de Galois absolu de K forment une catégorie équivalente à la catégorie des ϕ-modules dits " étales " sur K. Le but des travaux rassemblés ici est donner des algorithmes pour décrire le plus complètement possible la représentation associée à un ϕ-module donné. Nous étudions en préambule les ϕ-modules sur les corps finis, ce qui nous permet d'obtenir de nouveaux résultats décrivant les polynômes tordus sur un corps fini, qui sont des ob jets utilisés notamment en théorie des codes correcteurs. Cela nous permet d'améliorer en partie l'algorithme dû à Giesbrecht pour la factorisation de ces polynômes. Nous nous intéressons ensuite à la catégorie des ϕ-modules sur un corps de séries formelles de caractéristique p. Nous donnons une classification des ob jets simples de cette catégorie lorsque le corps résiduel est algébrique- ment clos, et décrivons un algorithme efficace pour décomposer un ϕ-module en ϕ-modules " isoclines ". Nous donnons des applications à l'étude algorithmique des représentations de p-torsion de groupes de Galois p-adiques.
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Lane, J. B. « Inclusive #Phi# photoproduction at 25-70 GeV ». Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233063.
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Toulmonde, Vincent. « Fonction de répartition de [phi](n)/n ». Evry-Val d'Essonne, 2004. http://www.theses.fr/2004EVRY0011.
Texte intégralRésumé :
Cette thèse est consacrée à l'étude du module de continuité de la fonction de répartition G de [phi](n)/n. La première partie est dévolue à l'étude de G(t) au voisinage de t = 1. L'étude du comportement en 1 est traitée par des méthodes d'équations fonctionnelles, via l'introduction d'un paramètre y contrôlant la taille du plus petit facteur premier P-(n) de l'entier générique n. Nous en déduisons en seconde partie des résultats relatifs au module de continuité de G en tout point, en utilisant une méthode développée par Erdös et reliant le module de continuité en tout point au comportement en 1. Nous montrons que ce module de continuité est maximal lorsque t est suffisamment proche de 1/2, et obtenons des estimations des normes respectivement infinie et Lr de ce module lorsque le réel r > 1 est fixéThis thesis deals with the modulus of continuity of the distribution function G of [phi](n)/n. The first part concerns the behavior of G(t) near t = 1. The behavior near 1 is studied by the means of functional equations. In order to establish such equations, a parameter y is introduced, which governs the size of the smallest prime factor P-(n) of a general integer n. In the second part, results for the modulus of continuity near any point are deduced from the behavior near t = 1, using a method of Erdös. The modulus attains its maximum when t is sufficiently close to 1/2. Estimates of in_nite and Lr norms of the modulus of continuity are obtained, when r > 1 is fixed
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Luquin, Lionel. « ETUDE DE LA PRODUCTION DU J/phi ET DU phi' DANS LES COLLISIONS SOUFFRE-URANIUM A 200 GEV/NUCLEON ». Clermont-Ferrand 2, 1996. http://www.theses.fr/1995CLF21714.
Texte intégralRésumé :
L'axe principal de recherche de l'experience na38, realisee au cern, est la mise en evidence du plasma de quarks et de gluons (qgp). Dans ce but, l'etude de la production de la resonance j/ par rapport au continuum de dimuon, en correlation avec la densite d'energie, a ete entreprise en 1986. La baisse relative de la production du j/ observee reste cependant compatible avec des modeles ne faisant pas intervenir le plasma. Par contre l'etude de la production relative des resonances ' et j/ doit permettre de mieux distinguer les phenomenes d'absorption de la formation du qgp. Cette these decrit cette etude a l'aide des donnees a hautes statistiques collectees en 1992. Dans ce document, l'appareillage est decrit et plus particulierement le calorimetre electromagnetique dont le dispositif de rejet d'empilement a permis de conserver de l'ordre de 40% d'evenements en plus pour l'analyse. De plus, etant donne la faible section efficace de production du ' et la faible difference de masse entre les resonances j/ et ', une etude approfondie de tous les phenomenes affectant la resolution en masse du spectrometre a ete realisee. Les resultats obtenus montrent que le rapport '/ est multiplie par un facteur 0. 61 lorsque la densite d'energie atteinte au cours des collisions passe de 1. 34 gev/fm#3 a 2. 33 gev/fm#3 (densite a laquelle le plasma doit etre forme). Ce rapport est egalement exprime en fonction de l'epaisseur de matiere nucleaire traversee et compare avec les resultats obtenus par d'autres experiences. Cependant, compte tenu des barres d'erreur il n'est pas possible d'affirmer que le plasma de quarks et de gluons a ete observe en laboratoire
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Pous, Ramos Joan. « Estructura tridimensional del connector del bacteriòfag PHI 29 ». Doctoral thesis, Universitat Autònoma de Barcelona, 2002. http://hdl.handle.net/10803/3337.
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Jager, Leah R. « Goodness-of-fit statistics based on phi-divergences / ». Thesis, Connect to this title online ; UW restricted, 2006. http://hdl.handle.net/1773/8965.
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Tavares, Ribeiro Floric. « (phi, Gamma)-modules et loi explicite de réciprocité ». Phd thesis, Université de Franche-Comté, 2008. http://tel.archives-ouvertes.fr/tel-00379771.
Texte intégralRésumé :
Le cadre de cette thèse est celui de la théorie des représentations p-adiques, et plus particulièrement la théorie de Fontaine. Je m'intéresse au cas d'une extension métabélienne d'un corps local et construit un (phi, Gamma)-module adapté à cette extension, puis je fournis des généralisations de certains outils usuels associés à ce (phi, Gamma)-module tel qu'un complexe calculant la cohomologie de la représentation. J'établis encore les formules explicites du dictionnaire entre le monde des représentations et celui des (phi, Gamma)-modules, pour le complexe de Herr, le cup-produit ou l'application de Kummer.La seconde partie de ce travail est dévolue à la preuve de la loi de réciprocité de Brückner-Vostokov pour un groupe formel. Je combine pour cela des méthodes relevant des (phi, Gamma)-modules à l'aide des résultats de la première partie et des techniques spécifiques introduites par Abrashkin à travers une interprétation cohomologique de ses travaux. J'obtiens ainsi une preuve de la loi de réciprocité libre de toute hypothèse non naturelle sur l'appartenance de racines de l'unité au corps de base.
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Vienney, Mathieu. « Construction de (phi,gamma)-modules en caractéristique p ». Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2012. http://tel.archives-ouvertes.fr/tel-00763785.
Texte intégralRésumé :
Cette thèse est constituée de deux parties indépendantes, étudiant deux aspects de la théorie des (φ,Γ)-modules en caractéristique p. La première partie porte sur l'étude de la réduction modulo p des représentations cristallines irréductibles de dimension deux. Nous donnons, pour des poids k ≤ p², un calcul explicite de la réduction de V(k,a) pour a dans un disque fermé centré en zéro, généralisant ainsi des résultats déjà connus pour k ≤ 2p. En particulier, nous calculons le plus grand rayon possible pour ce disque, et montrons que dans certains cas, la réduction qui est constante à l'intérieur du disque change sur son bord. Dans la seconde partie, nous nous intéressons aux représentations d'un sous-groupe de Borel de GL[indice]2(Q[indice]p) sur un corps de caractéristique p, et en particulier à celles qui sont lisses, irréductibles et admettent un caractère central. Une méthode pour construire de telles représentations à partir de (φ,Γ)-modules irréductibles a été décrite par Colmez dans sa construction de la correspondance de Langlands p-adique. Après avoir donné un cadre un peu plus général dans lequel la construction de Colmez fonctionne encore, nous classifions les représentations irréductibles du Borel, prouvant que la construction précédente permet d'obtenir toutes les représentations de dimension infinie. Lorsque le corps des coefficients est fini, ou algébriquement clos, nous disposons d'une interprétation galoisienne des (φ,Γ)-modules irréductibles, et la classification précédente permet alors d'obtenir une correspondance entre ces représentations du Borel et des représentations galoisiennes modulaires.
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Türköz, Ş. (Şemsettin). « Variational procedure for [phi]4-scalar field theory ». Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/52913.
Texte intégralRésumé :
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1990.On t.p. "[phi]" is the original Greek letter.
Includes bibliographical references (leaves 81-83).
by Ş. Türköz.
Ph.D.
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Sudo, Yasutada Ph D. Massachusetts Institute of Technology. « On the semantics of phi features on pronouns ». Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/77805.
Texte intégralRésumé :
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Linguistics and Philosophy, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 246-260).
This thesis investigates three topics relating to the semantics of phi features on pronouns. Part I focuses on gender features on pronouns. Following previous studies (Cooper 1983, Heim & Kratzer 1998), I claim that they are presupposition triggers. Based on this assumption, I show that predicates containing bound gendered pronouns have an assertive meaning that does not entail the gender presupposition, and further point out that such predicates pose a serious challenge for existing theories of presupposition projection, especially with respect to quantified sentences. A conclusion drawn from this discussion is that the presupposition needs to be dissociated from the assertive meaning, as in Karttunen & Peters's (1979) two dimensional theory. However, such a theory is known to run into the so-called binding problem in quantified sentences. I propose a solution to the binding problem using the mechanism of cross-sentential anaphora, and show that the resulting theory nicely accounts for the projection properties of various quantificational determiners. Part II discusses the interpretation of person and number features on bound pronouns. It is known that some occurrences of phi features on bound pronoun behave as if they are semantically inert (Heim 2008b, Jacobson to appear, Kratzer 1998a, 2009, Partee 1989). One popular account of this phenomenon, the minimal pronoun account, claims that such phi features are purely morphological, and postulates a PF operation that transmits phi features of a binder onto each pronoun that it binds (Heim 2008b, Kratzer 1998a, 2009). I put forward an alternative account that dispenses with the PF operation, and instead puts most of the burden on syntax, by encoding more information in the indices than standardly assumed. As a result, all occurrences of phi features are semantically relevant. I offer both empirical and conceptual arguments for the proposed account over the minimal pronoun account. Part III deals with the phenomenon of indexical shifting where person features are systematically affected (Anand 2006, Anand & Nevins 2004, Schlenker 1999, 2003b). I discuss novel data from Uyghur and Japanese as well as data drawn from previous studies, particularly focusing on the universals and variation within and across languages.
by Yasutada Sudo.
Ph.D.
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Anciant, Eric. « Photoproduction de mesons phi a grand moment transfere ». Paris 6, 2000. http://www.theses.fr/2000PA066012.
Texte intégralRésumé :
Cette these a pour sujet la photoproduction du meson vecteur phi sur le proton a grand moment transfere t. Le meson phi etant constitue essentiellement d'une paire de quarks etranges et la composante etrange du nucleon etant faible, la contribution de l'echange de quarks de valence est tres faible, assurant la dominance des echanges gluoniques dans la voie t, sous forme de pomeron ou de gluons non-perturbatifs. Afin de pouvoir etendre cette mesure jusqu'a des valeurs de transfert t = 5 gev2, ou les sections efficaces atteignent des valeurs aussi faibles que 100 pb/gev2, nous avons utilise l'accelerateur de nouvelle generation cebaf, fournissant un faisceau continu, ainsi que le spectrometre de grande acceptance (4 pi) clas. Le phi a ete identifie via sa decroissance en deux kaons (k+k). Le proton et le k+ ont ete identifies par mesure de temps de vol. Le k a ete identifie par la technique de masse manquante. Le signal du phi est tres clair jusqu'aux plus grandes valeurs de t, au dessus d'un continuum k+k non-resonnant. Nous avons estime l'efficacite de clas par simulation monte-carlo. Le flux de photons a ete mesure via un spectrometre de paires, permettant un calcul direct de la section efficace differentielle. Un modele d'echange de deux gluons non-perturbatifs reproduit precisement nos donnees. Ces resultats mettent en evidence l'importance du couplage de ces gluons a des quarks differents du proton, ce qui nous donne acces aux correlations entre quarks dans l'etat fondamental du nucleon. L'analyse de la decroissance angulaire du phi montre une legere deviation a grand t par rapport a l'hypothese de conservation de l'helicite dans la voie s, ainsi qu'une interference avec le continuum non-resonnant k+k.
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Vrbenský, Andrej. « Paralelizace ultrazvukových simulací pomocí akcelerátoru Intel Xeon Phi ». Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2015. http://www.nusl.cz/ntk/nusl-264950.
Texte intégralRésumé :
Nowadays, the simulation of ultrasound acoustic waves has a wide range of practical usage. As one of them we can name the simulation in realistic tissue media, which is successfully used in medicine. There are several software applications dedicated to perform such simulations. k-Wave is one of them. The computational difficulty of the simulation itself is very high, and this leaves a space to explore new speed-up methods. In this master's thesis, we proposed a way to speed-up the simulation based on parallelization using Intel Xeon Phi accelerator. The accelerator contains large amount of cores and an extra-wide vector unit, and therefore, is ideal for purpose of parallelization and vectorization. The implementation is using OpenMP version 4.0, which brings some new options such as explicit vectorization. Results were measured during extensive experiments.
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Heine, P. [Verfasser]. « Untersuchung des diffraktiven Charakters der Phi p-Streuung in der Reaktion γp→Phi p im Energiebereich 4.65-6.71 GeV / P. Heine ». Karlsruhe : KIT-Bibliothek, 2010. http://d-nb.info/1188431706/34.
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Hirschmann, H. [Verfasser]. « Photoproduktion des Phi-Mesons bei kleinem Impulsuebertrag / H. Hirschmann ». Karlsruhe : KIT-Bibliothek, 2010. http://d-nb.info/1188431870/34.
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Sinclair, R. B. « The repressor (c) gene of Streptomyces phage #PHI#c31 ». Thesis, University of East Anglia, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378897.
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Yiangou, Yiangos. « Studies on peptide-histidine isoleucine (PHI-27)-like peptides ». Thesis, Imperial College London, 1988. http://hdl.handle.net/10044/1/47318.
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Smit, Konrad van Zyl. « Applying the phi ratio in designing a musical scale ». Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/2989.
Texte intégralRésumé :
Thesis (MMus (Music))--University of Stellenbosch, 2005.In this thesis, an attempt is made to create an aesthetically pleasing musical scale based on the ratio of phi. Precedents for the application of phi in aesthetic fields exist; noteworthy is Le Corbusier’s architectural works, the measurements of which are based on phi. A brief discussion of the unique mathematical properties of phi is given, followed by a discussion of the manifestations of phi in the physical ratios as they appear in animal and plant life. Specific scales which have found an application in art music are discussed, and the properties to which their success is attributable are identified. Consequently, during the design of the phi scale, these characteristics are incorporated. The design of the phi scale is facilitated by the use of the most sophisticated modern computer software in the field of psychacoustics. During the scale’s design process, particular emphasis is placed on the requirement of obtaining maximal sensory consonance. For this reason, an in-depth discussion of the theories regarding consonance perception is undertaken. During this discussion, the reader’s attention is drawn to the difference between musical and perceptual consonance, and a discussion of the developmental history of musical consonance is given. Lastly, the scale is tested to see whether it complies with the requirements for successful scales.
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Kačurik, Tomáš. « Vysoce náročné aplikace na svazku karet Intel Xeon Phi ». Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2016. http://www.nusl.cz/ntk/nusl-255394.
Texte intégralRésumé :
The main topic of this thesis is the implementation and subsequent optimization of high performance applications on a cluster of Intel Xeon Phi coprocessors. Using two approaches to solve the N-Body problem, the possibilities of the program execution on a cluster of processors, coprocessors or both device types have been demonstrated. Two particular versions of the N-Body problem have been chosen - the naive and Barnes-hut. Both problems have been implemented and optimized. For better comparison of the achieved results, we only considered achieved acceleration against single node runs using processors only. In the case of the naive version a 15-fold increase has been achieved when using combination of processors and coprocessors on 8 computational nodes. The performance in this case was 9 TFLOP/s. Based on the obtained results we concluded the advantages and disadvantages of the program execution in the distributed environments using processors, coprocessors or both.
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Hong, Dennis Hwe-Yang. « Temperature adaptation and range expansion of bacteriophage Phi-6 / ». Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2002. http://wwwlib.umi.com/cr/ucsd/fullcit?p3070998.
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Poyeton, Léo. « Extensions de Lie p-adiques et (Phi, Gamma)-modules ». Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEN007/document.
Texte intégralRésumé :
Dans cette thèse, on s'intéresse à des aspects théoriques de la théorie des représentations p-adiques du groupe de Galois absolu de K, où K est un corps p-adique, réunis autour de deux axes principaux : d'une part, tenter de caractériser les extensions de Lie p-adiques pour lesquelles on peut définir une théorie des (φ,Γ)-modules, et d'autre part étudier la théorie des (φ,τ)-modules pour obtenir des applications aux représentations p-adiques, et en particulier pour les représentations semi-stables. Cette thèse est constituée de cinq chapitres. Le premier présente les résultats sur les représentations p-adiques, les (φ,Γ)-modules et la théorie de Hodge p-adique nécessaires aux autres chapitres. Dans le deuxième chapitre, on s'intéresse à la question des extensions de Lie p-adiques pour lesquelles on peut définir une théorie des (φ,Γ)-modules, et on montre que, sous l'hypothèse supplémentaire de demander à ce que le Frobenius soit de hauteur finie, ces extensions sont des extensions de Lubin-Tate à extension finie près. Le troisième chapitre expose la théorie des vecteurs localement analytiques nécessaire aux quatrième et cinquième chapitres. Le quatrième chapitre utilise la théorie des vecteurs localement analytiques pour montrer la surconvergence des (φ,τ)-modules. Dans le cinquième chapitre, on utilise les résultats du quatrième chapitre pour caractériser les représentations semi-stables et potentiellement semi-stables du groupe de Galois absolu de K en fonction de leur (φ,τ)-module, et on montre comment retrouver les invariants Dcris et Dst d'une représentation à partir de leur (φ,τ)-moduleIn this thesis, we study some theorical aspects of the theory of p-adic representations of the absolute Galois group of K, where K is a p-adic field. First, we try to give a characterization of the p-adic Lie extensions of K for which one can build a theory of (φ,Γ)-modules. Then, we study the theory of (φ,τ)-modules. This thesis consists of five chapters. The first one introduces the results on p-adic representations, (φ,Γ)-modules and p-adic Hodge theory which are needed in the other chapters. In the second chapter, we try to understand which p-adic Lie extensions of K can be used in order to build a theory of (φ,Γ)-modules and we prove that, under the additional assumption that the Frobenius is of finite height, such extensions are, up to a finite extension, Lubin-Tate extensions. The third chapter lays out the theory of locally analytic vectors needed for the fourth and fifth chapters. The fourth chapter uses the theory of locally analytic vectors to prove the overconvergence of (φ,τ)-modules. In the fifth chapter, we use results obtained in the fourth chapter in order to characterize semi-stable and potentially semi-stable representations of the absolute Galois group of K from their (φ,τ)-modules, and we show how to recover the invariants Dcris and Dst attached to a representation V from its (φ,τ)-module
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Ye, Shuyang. « On G-(phi,nabla)-modules over the Robba ring ». Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/20359.
Texte intégralRésumé :
Sei $K$ eine endliche Erweiterung von $QQ_p $ und sei $R$ der Robba-Ring mit Koeffizienten in $K$ sein, die mit einem absoluten Frobenius-Lift $phi$ ausgestattet sind. Sei $F$ der Fixköper von $K$ unter $phi $ und sei $G$ eine verbundene reduktive Gruppe über $F$. Diese Arbeit untersucht $G$-$ (phi,nabla)$-Module über $R$, nämlich $(phi,nabla)$-Module über $R$ mit einer zusätzlicher $G$-Struktur.
In Kapitel 3 konstruieren wir einen gefilterten Faserfunktor aus der Darstellungskategorie von $G$ auf endlich-dimensionalen $F$-Vektorräumenbis zur Kategorie von $QQ$-gefilterten Modulen über $R$, und beweisen, dass dieser Funktor spaltbar ist. In Kapitel 4 beweisen wir eine $G$-Version des $p$-adischen lokalen Monodromie-Satzes. In Kapitel 5 beweisen wir eine $G$-Version des logarithmischen lokalen Monodromie-Satzes unter bestimmten Annahmen. Als Anwendung fügen wir jedem $G$-$(phi,nabla)$-Modul eine Weil-Deligne-Darstellung der Weil-Gruppe $W_{kk((t))} $ in $G(K^{nr})$ an, wobei $kk$ der Restklassenkörper von $K$, und $K^{nr}$ die maximal unverzweigte Erweiterung von $K$ ist.Let $K$ be a finite extension of $QQ_p$ and let $R$ be the Robba ring with coefficients in $K$, equipped with an absolute Frobenius lift $phi$. Let $F$ be the fixed field of $K$ under $phi$ and let $G$ be a connected reductive group over $F$. This thesis investigates $G$-$(phi,nabla)$-modules over $R$, namely $(phi,nabla)$-modules over $R$ with an additional $G$-structure. In Chapter 3, we construct a filtered fiber functor from the category of representations of $G$ on finite-dimensional $F$-vector spaces to the category of $QQ$-filtered modules over $R$, and prove that this functor is splittable. In Chapter 4, we prove a $G$-version of the $p$-adic local monodromy theorem. In Chapter 5, we prove a $G$-version of the logarithmic $p$-adic local monodromy theorem under certain assumptions. As an application, we attach to each $G$-$(phi,nabla)$-module a Weil-Deligne representation of the Weil group $W_{kk((t))}$ into $G(K^{nr})$, where $kk$ is the residue field of $K$, and $K^{nr}$ is the maximal unramified extension of $K$.
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ANSELLI, ANDREA. « PHI-CURVATURES, HARMONIC-EINSTEIN MANIFOLDS AND EINSTEIN-TYPE STRUCTURES ». Doctoral thesis, Università degli Studi di Milano, 2020. http://hdl.handle.net/2434/703786.
Texte intégralRésumé :
The aim of this thesis is to study the geometry of a Riemannian manifold M, with a special structure, called Einstein-type structure, depending on 3 real parameters, a smooth map phi into a target Riemannian manifold N, and a smooth function, called potential function, on M itself. We will occasionally let some of the parameters be smooth functions. The setting generalizes various previously studied situations:, Ricci solitons, almost Ricci-solitons, Ricci-harmonic solitons, quasi-Einstein manifolds and so on. By taking a constant potential function those structures reduces to harmonic-Einstein manifolds, that are a generalization of Einstein manifolds. The main ingredient of our analysis is the study of certain modified curvature tensors on M related to the map phi, called phi-curvatures, obtaining, for instance, their transformation laws under a conformal change of metric, and to develop a series of results for harmonic-Einstein manifolds that parallel those obtained for Einstein manifolds some times ago and also in the very recent literature. Einstein-type structures may be obtained, for some special values of the parameters involved, by a conformal deformation of a harmonic-Einstein manifold or even as the base of a warped product harmonic-Einstein manifold. The latter fact applies not only in the Riemannian but also in the Lorentzian setting and thus some Einstein-type structures are connected with solutions of the Einstein field equations, which are of particular interest in General Relativity. The main result of the thesis is the locally characterization, via a couple of integrability conditions and mild assumptions on the potential function, of Einstein-type structures with vanishing phi-Bach curvature (in the direction of the potential) as a warped product with harmonic-Einstein base and with an open real interval as fibre, extending in a very non trivial way a recent result for Bach flat Ricci solitons. Moreover the map phi depends only on the base of the warped product and not on the fibre . We also consider rigidity, triviality and non-existence results, both in the compact and non-compact cases. This is done via integral formulas and, in the non-compact case, via analytical tools, like the weak maximum principle and the classical results of Obata, Tashiro, Kanai.
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Branca, Antonio. « Search for the Supersymmetric Higgs boson in the pp -> ; b + Phi ; Phi -> ; bb-bar channel with the CMS detector at LHC ». Doctoral thesis, Università degli studi di Padova, 2013. http://hdl.handle.net/11577/3426645.
Texte intégralRésumé :
In this thesis the analysis performed for the search of the Higgs boson predicted by the Minimal Super-symmetric Standard Model (MSSM) is presented. The process on which the search is grounded is the Higgs boson production in association with b-quarks with the subsequent decay in a b-quark pair. The analyzed data sample has been recorded by the Compact Muon Solenoid (CMS) experiment at the CERN Large Hadron Collider (LHC) in Geneva, Switzerland, during the 2011 data-taking. The data sample consists of a total integrated luminosity of L = 4.8 fb-1, recorded with different trigger paths along the 2011 LHC operations.
The trigger have been updated during the data-taking in order to cope with the increasing pp collisions instantaneous luminosity provided by the LHC. The background to the signal events has been estimated through two data-driven
methods. The systematic uncertainties related to the background have been estimated for both the shape and normalization. The signal is modeled through Monte Carlo simulation technique for different hypothesis of the Higgs boson mass. The systematic uncertainties related to the signal model, from different sources, have been estimated. A possible signal contribution in the analyzed data sample is investigated through a t to the data using the background templates estimated from the data-driven methods and the signal model from Monte Carlo simulation. The systematic uncertainties, as well as the statistics uncertainties, for both the signal and background have been taken into account in the t. The results are compatible with the expected background within the statistics and systematic uncertainties. No signal is found in the data within the sensitivity of the analysis. The sensitivity of the analysis has been calculated in the background only hypothesis.
This is reported as upper limits on the cross section of the Higgs boson produced in association with two b-quarks times the branching ratio of the decay into a b-quark pair. This values are also interpreted as upper limits on parameters
of the MSSM model. The results of the analysis discussed in this thesis have been combined with those obtained by the DESY (Hamburg, Germany) CMS group, exploiting a different
analysis strategy for searching the Higgs boson in the same channel. The combined upper limits from the two analysis improve the sensitivity of the CMS experiment to a Higgs boson signal produced through the tested channel with
respect to the single analysis.In questa tesi e discussa l'analisi sviluppata per la ricerca del bosone di Higgs con le caratteristiche previste dall'estensione minimale del modello standard alle super-simmetrie (MSSM). La ricerca del segnale e effettuata nel canale in cui il bosone di Higgs e prodotto in associazione con uno o due b-quark e successivamente decade in due b-quark. I dati utilizzati a tal proposito sono stati acquisiti durante la presa dati del 2011 all'esperimento Compact Muon Solenoid (CMS) installato al Large Hadron Collider (LHC) del CERN di Ginevra, Svizzera. La luminosita integrata a cui corrisponde il campione di dati analizzato e pari a L = 4.8 fb-1. Diversi trigger sono stati sviluppati per selezionare gli eventi compatibili con lo stato finale atteso prodotto dal canale considerato. Essi sono stati implementati a seconda del periodo per far fronte all'aumento della luminosita istantanea con cui sono state fornite le collisioni pp da LHC nel corso del 2011. Il fondo al processo considerato e stato stimato tramite due metodi sviluppati a tal fine usando dati acquisiti dall'esperimento CMS. Le incertezze sistematiche sulla forma del fondo e sulla sua normalizzazione sono state determinate. La modelizzazione del segnale prodotto dal bosone di Higgs nel canale considerato, per diverse ipotesi di massa, e stata ottenuta tramite simulazione con metodo Monte Carlo. Anche in questo caso le incertezze sistematiche, dovute ai diversi contributi individuati, sono state determinate. La ricerca di un possibile contributo di segnale nei dati e stata effettuata eseguendo un fit ai dati del fondo stimato e del segnale simulato, tenendo conto delle rispettive incertezze statistiche e sistematiche. I fit risultano compatibili con il fondo atteso entro le incertezze. Nessun segnale viene evidenziato nel campione di dati analizzato entro i limiti di sensibilita dell'analisi. I limiti di sensibilita dell'analisi sono stati calcolati nell'ipotesi di solo fondo nei dati. Tali limiti sono riportati in termini di valori della sezione d'urto di produzione associata dell'Higgs con una coppia di b-quark per la probabilita di decadimento in due b-quark. Questi valori sono stati inoltre interpretati in termini dei parametri del modello MSSM. I risultati dell'analisi presentata in questo lavoro sono stati combinati con quelli ottenuti dall'analisi effettuata dal gruppo CMS di DESY (Amburgo, Germania) che, attraverso un'altra strategia, ha effettuato la ricerca del bosone di Higgs nello stesso canale. I limiti combinati delle due analisi migliorano la sensibilita dell'esperimento CMS ad un segnale prodotto da un bosone di Higgs nel canale considerato rispetto alle singole analisi.
38
Lee, Anne H. « Heterogeneity in pHi and the selection for variants with increased and decreased Na§+- dependent CI§-/HCO¦3§- exchange activity on the basis of pHi ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq28776.pdf.
Texte intégral
39
Udluft, Steffen. « Protondissoziative Photoproduktion von Phi-Mesonen am H1-Experiment bei HERA ». Diss., lmu, 2000. http://nbn-resolving.de/urn:nbn:de:bvb:19-4682.
Texte intégral
40
Järkeborn, Sebastian. « Vägplaneringsalgoritmerna Incremental Phi* och Field D* : Frivinkelvägar i okända miljöer ». Thesis, Högskolan i Skövde, Institutionen för informationsteknologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-12385.
Texte intégralRésumé :
Incremental Phi* och Field D* är vägplaneringsalgoritmer som uppfyller två egenskaper. Den första är att deras vägar kan korsa en miljö i vilken vinkel som helst. Den andra är att de i en okänd miljö kan planera om sina vägar snabbt ifall de stöter på ett hinder. Detta kan vara användbart i realtidsstrategispel. Detta arbete testar därför deras förmåga att skapa korta vägar och att planera om vägar snabbt för att ta reda på deras styrkor och svagheter. Utöver detta testas också deras tider i den första sökningen de gör när miljön är outforskad samt i de fall där algoritmerna har visat sig ha svagheter, vilket är i tomma miljöer och i återvändsgränder. Resultatet är att Incremental Phi* hittar kortare vägar och planerar om vägar snabbare. Den får också kortare tider i en tom miljö, medan Field D* får bättre tider i den första sökningen och i återvändsgränder.
41
Finnis, Christopher J. A. « A DNA packaging system from the Streptomyces phage #phi#C31 ». Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250469.
Texte intégral
42
Schouler, Catherine. « Caractérisation immunogénétique du bactériophage virulent phi 197 de Lactococcus lactis ». Toulouse 3, 1992. http://www.theses.fr/1992TOU30078.
Texte intégralRésumé :
Les bacteries lactiques en realisant la fermentation lactique jouent un role essentiel dans la transformation des aliments dans les industries agro-alimentaires. Ces bacteries peuvent etre detruites par des bacteriophages contaminants, ce qui se traduit par une diminution, voire un arret de l'acidification lors de la fermentation et occasionne un declassement avec une perte de produits. Un test de detection rapide de ces phages, inexistant a ce jour, permettrait la mise en evidence precoce de la contamination phagique et ainsi d'eviter les accidents de fermentation qui en resultent. Un test immunologique de type elisa base sur l'utilisation de determinants phagiques fusionnes a la beta-galactosidase et d'anticorps monoclonaux pourrait etre developpe dans ce but. Un phage representatif d'une famille de phages tres frequemment rencontre lors des accidents de fermentation a ete choisi. La carte physique de ce phage, phi197, a ete etablie. Son genome est constitue d'une molecule lineaire d'adn bicatenaire d'une taille de 23kb avec des extremites cohesives. Trois proteines de fusion constituees de la beta-galactosidase associee a des epitopes de proteines structurales du phage phi197 ont ete construites. Les fragments d'adn codant pour ces determinants antigeniques ont ete localises sur la carte de restriction du phage et leur sequence nucleotidique a ete determinee. Un serum polyclonal dirige contre une des proteines hybrides, la proteine poa17, a permis d'identifier la proteine de 46 kda du phage phi197 dont est issu l'epitope porte par poa17. Des experiences immunologiques ont confirme la conservation de l'epitope au sein de la famille de phages apparentes a phi197
43
Loukachine, Konstantin. « Electroproduction of the Phi(1020) Vector Meson at 4 GeV ». Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/26172.
Texte intégralRésumé :
We studied the reaction ep -> e'p'phi with a
4.2 GeV incident electron beam in the region of
the electroproduction variables Q2 from 0.7 to
2.2 GeV2 and W from 2.0 to 2.6 GeV. The data
were taken and analyzed at the Thomas Jefferson
National Accelerator Facility. For the first time,
we observe the expected t-slope dependence on
Q2 and Delta-Tau in phi vector meson production.
We find that the width of the forward phi-meson
diffraction peak increases rapidly as the
interaction time decreases below cDelta-Tau of
1 fm. Within a simple optical model framework,
the data show that phi meson has a smaller size
than the rho. The measured phi cross-section
dependence on Q2 is in a good agreement with
previous measurements and well-described by the
phenomenological Pomeron exchange model. Our
cross-section data do not favor the standard
Vector Meson Dominance and ss-bar-knockout model
predictions. From the angular distribution of
the decay phi -> K+K-, assuming the s-channel
helicity conservation, we extracted the
longitudinal-to-transverse cross-section ratio,
R, and Vector Meson Dominance scaling parameter,
xi2, which are consistent with the previous
measurements and the model expectations.Ph. D.
44
Cramer, Todd James Lucas. « Genetic mosaicism between the bacteriophage [phi]80 and bacteriophage [lambda] ». Bowling Green, Ohio : Bowling Green State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1223514067.
Texte intégral
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Ferris, Martin Thomas Burch Christina L. « Evolution of the host range of the bacteriophage [phi]6 ». Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2007. http://dc.lib.unc.edu/u?/etd,1798.
Texte intégralRésumé :
Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2008.Title from electronic title page (viewed Dec. 11, 2008). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Biology." Discipline: Biology; Department/School: Biology. On t.p. and in abstract, [phi] is the Greek letter.
46
Pillutla, Pallavi. « Phi Beta Delta : Implementation of a self-maintaining web site ». CSUSB ScholarWorks, 2007. https://scholarworks.lib.csusb.edu/etd-project/3275.
Texte intégralRésumé :
The purpose of this project was to develop an easy-to-maintain web site for the Gamma Lambda Chapter of Phi Beta Delta International Honor Society here at California State University, San Bernardino, which will manage complete and up-to-date information about the mission, members, officers and all the activities of the honor society.
47
SALVATORI, GIULIO. « AMPLITUHEDRA FOR PHI^3 THEORY AT TREE AND LOOP LEVEL ». Doctoral thesis, Università degli Studi di Milano, 2019. http://hdl.handle.net/2434/740134.
Texte intégralRésumé :
In this thesis we explore a novel connection between scattering amplitudes and
positive geometries, which are semi-algebraic varieties iteratively defined by the
property of possessing a boundary structure which reduces into lower dimensional
version of themselves. The relevance of positive geometries in physics was first
discovered in the context of scattering amplitudes in N = 4 SYM and led to the
definition of the Amplituhedron. An analogue structure was very recently found to tie
tree level scattering amplitudes in the bi-adjoint scalar theory to the Stasheff
polytope and the moduli space of Riemann surfaces of genus zero. Here we further
extend this framework and show how the 1-loop integrand in bi-adjoint theory, or
more generally in a planar scalar cubic theory, is connected with moduli spaces of
more general Riemann surfaces. We propose hyperbolic geometry to be a natural
language to study the positive geometries living in various moduli spaces, then we
illustrate convex realizations of polytopes which are combinatorially equivalent to
them, but live directly in the kinematical space of amplitudes and integrands. Finally,
we show how to exploit these constructions to provide novel and efficient recursive
formulae for both tree level amplitudes and 1-loop integrands.
48
Silva, Olivia Beloto da. « Efeito da glicose sobre recuperação do pHi em células HEK-293 ». Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/42/42137/tde-01072009-112943/.
Texte intégralRésumé :
Os estudos foram realizados em cultura de células HEK-293 (human embrionic kidney cells). Por microscopia de fluorescência, avaliou-se a velocidade de recuperação do pHi (dpHi/dt). Por Western blot, avaliou-se a expressão de SGLTs e NHEs e a translocação dos SGLTs foi avaliada por imunofluorescência. Resultados: No controle, a dpHi/dt foi de 0,169 ± 0,020 unid pH/min (n=6). A glicose modula dose e tempo dependentemente a dpHi/dt. O tratamento crônico aumentou esse parâmetro e somente Florizina (inibidor dos SGLTs), H-89 (inibidor da PKA) e BAPTA (quelante de Ca2+intracelular Ca2+i) reduziram esse efeito. O tratamento crônico induziu a internalização do SGLT1, manteve o SGLT2 no citosol e aumentou sua expressão. Conclusões: No tratamento crônico, a internalização do SGLT1 depende da PKA, independe de Ca2+i e a permanência do SGLT2 no citosol depende tanto da PKA quanto do Ca2+i. Assim, a distribuição celular do SGLT2 altera a atividade dos NHEs.In this work we used human embryonic kidney (HEK-293 cells). The pHi recovery rate (dpHi/dt) was evaluated through fluorescence microscopy. The expression of SGLT´s and NHEs was analysed through Western blot and translocation of SGLTs was evaluated through Imunofluorescence. Results: In the control situation, the dpHi/dt was 0,169 ± 0,020 units pH/min (n=6). This parameter was modulated by glucose in a concentration and time dependent manner. Chronic treatment increased the dpHi/dt and this stimulatory effect was inhibited by Phlorizin (SGLTs inhibitor), H-89 (PKA inhibitor) and BAPTA (intracellular Ca2+ cheleator - Ca2+i). The chronic treatment induced internalization of SGLT1, increased the expression of SGLT2 and kept it in the cytosol. Conclusions: In chronic treatment, the internalization of SGLT1 involves a PKA-dependent and Ca2+i- independent mechanism. The maintenance of SGLT2 in the cytosol depends on PKA and Ca2+i. Thus, the cellular distribution of SGLT2 is associated with NHEs activity.
49
Symalla, Michael [Verfasser]. « Produktion von Phi-Mesonen in inelastischen Proton-Kern-Wechselwirkungen / Michael Symalla ». Dortmund : Universitätsbibliothek Technische Universität Dortmund, 2004. http://d-nb.info/1011531909/34.
Texte intégral
50
Liu, Ruochuan. « On the slope filtration of [phi]-modules over the Robba ring ». Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45350.
Texte intégralRésumé :
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 2008.In title on title page, [phi] appears as lower case Greek letter.
Includes bibliographical references (leaves 63-65).
Given a p-adic representation of the Galois group of a local field, we show that its Galois cohomology can be computed using the associated étale ([phi], [Gamma])-module over the Robba ring; this is a variant of a result of Herr. We then establish analogues, for not necessarily étale (([phi], [Gamma])-modules over the Robba ring, of the Euler-Poincaré characteristic formula and Tate local duality for p-adic representations. These results are expected to intervene in the duality theory for Selmer groups associated to de Rham representations. We introduce the notion of families of [phi]-modules which arises naturally from both rigid cohomology and p-adic Hodge theory. We then prove the local constancy of generic HN-polygons of families of overconvergent [phi]-modules and the semicontinuity of HN-polygons of families of [phi]-modules over reduced affinoid algebras. These results are prospective for a slope theory of families of (overconvergent) [phi]-modules.
by Ruochuan Liu.
Ph.D.