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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
101

Measurement of the underlying event in pp collisions using the ATLAS detector and development of a software suite for Bayesian unfolding

Wynne, Benjamin Michael January 2013 (has links)
First measurements are made of the underlying event in calorimeter jet events at the LHC, using 37 pb-1 of pp collisions at √s = 7TeV, recorded during 2010 by the ATLAS detector. Results are compared for an assumed di-jet topology based on a single identified jet, and an exclusive di-jet requirement. The number of charged particles in the azimuthal region transverse to the jet axis is recorded, as well as their total and average transverse momentum. The total energy carried by all particles - charged and neutral - is also calculated, using the full calorimeter acceptance |η| < 4:8. Distributions are constructed to show the variation of these quantities versus the transverse momentum of the selected jet, over the range 20 - 800 GeV. Additional jets in the transverse region are shown to dramatically influence the measured activity. Software is developed to perform Bayesian iterative unfolding, testing closure of the process and stability with respect to the number of iterations performed. Pseudo-experiments are used to propagate systematic errors, and the intrinsic error due to unfolding is estimated. Although the correction relies on a prior probablitity distribution, model-dependence is reduced to an uncertainty comparable to or smaller than experimental systematic errors. The software is used to correct underlying event measurements for effects introduced by the ATLAS detector. Unfolded results are compared to predictions from different Monte Carlo event generators used in LHC analyses, showing general agreement in the range |η| < 2:5, but discrepancies in the forward region. Comparison with other ATLAS results shows compatible behaviour in events defined by any high-momentum charged particle, or by leptonic Z-boson decays.
102

Produktionsstyrning av cylinderbricka : För Atlas Copco, Tierp.

Pettersson, Erik January 2014 (has links)
The component workshop at Atlas Copco inTierp intends to reduce the costs inorder to increase their competitiveness.This thesis examines how the productionmanagement around cylinder washersshould be managed in a way that meetsthe customer needs. The customer to thecylinder washer is Atlas Copcos assemblydepartment in Tierp. The purpose of this thesis is to providean alternative way of managing theproduction. A chapter of theory is addedto give the reader an insight ofdifferent types of production managementsystems as well as the underlyingknowledge needed to get a better readingexperience. An introduction of kanbancan in theory help Atlas Copco in thedirection they strive. It should beclear how the purpose of this thesisaffects the cost for the componentworkshop and also how it relates to thecurrent production. The currentsituation is described by explaining howthey use SAP, EOQ and an analysis of how EOQ determine the batch size. Thencalculations on a kanban system is madeand also an idea of how the logistics ofthe kanban system should be managed. From this thesis, conclusions how animplementation of a kanbansystem wouldaffect the component workshop can beshown. By using the overcapacity withthe machine to increase the frequency ofchangeovers leads to reduced batch size.The reduced batch starts a chain of goodconsequences like reduction ofinventory. Changing from a productionmanaged by EOQ to a kanbanflow makes theproduction planning more transparent andrequire less resources. In a complexprocess there’s a lot of factors thatdetermine how the production is managed,a kanbansystem reduce the complexitywith an easy signal when the productionshould start. / Komponentverkstaden på Atlas Copco i Tierp har för avsikt att minska de kostnadsdrivandefaktorerna för att öka sin konkurrenskraft. Den här rapporten undersöker hur cylinderbrickorska produktionsstyras på ett sätt som tillgodoser cylinderbrickans kund (monteringen)samtidigt som lagernivåer inte ska vara för stora. Målet med rapporten är att ge komponentverkstaden i Tierp ett förslag om ett alternativttillvägagångssätt för att styra produktionen. Ett kapitel med teori finns för att ge läsaren eninblick i olika typer av produktionsledningssystem samt omkringliggande kunskaper sombehövs för att få en bättre läsupplevelse. Ett införande av kanbansystem anses i teorin kunnahjälpa Atlas Copco i den riktning de önskar. Det ska tydligt framgå hur alternativet påverkarde kostnadsdrivande faktorer samt hur det förhåller sig till nuvarande produktionsstyrning.Nuläget beskrivs genom att förklara hur de använder SAP och EOQ samt en analys av attutforma partistorlekar med hjälp av EOQ. Därefter räknas ett kanbansystem fram och en idéom hur logistiken kring kanbansystemet ska skötas. Från den här rapporten kan slutsatser dras om hur en implementering av ett kanbansystemskulle påverka komponentverkstaden. Genom att använda den överblivna tiden som finns vidmaskinen till att ställa om produktionen oftare, minskar partistorlekarna vilket startar enkedjereaktion av bra konsekvenser som till exempel mindre lager. Att gå ifrån en EOQ styrdproduktionsstyrning till ett kanbanflöde gör att produktionsplaneringen blir merlättöverskådlig och mindre resurskrävande. I en komplex process där en oöverskådlig mängdfaktorer styr hur produktionen ska planeras minskas komplexiteten med hjälp av ettkanbanstyrt flöde som ger signal om produktion efter förbrukning.
103

Monteringsverktyg

Hagman, Simon, Suonvieri, Robin January 2012 (has links)
Framtagning av monteringverktyg för stiftning av borrkronor.
104

La ride de Talmest-Tazoult : Haut Atlas central, Maroc : lithostratigraphie, biostratigraphie et relations tectonique-sédimentation au cours du jurassique /

Bouchouata, Abdelaziz. January 1994 (has links)
Th. univ.--Géol.--Toulouse 3, 1994. / Bibliogr. p. 210-219. Résumé en français et en anglais.
105

Bestimmung der fehlenden transversalen Energie auf der ersten Triggerstufe beim ATLAS-Experiment und Optimierung der Triggerselektion von supersymmetrischen Ereignissen

Rieke, Stefan January 2009 (has links)
Zugl.: Mainz, Univ., Diss., 2009
106

Topics in the measurement of top quark events with ATLAS pixel detector optoelectronics, track impact parameter calibration, acceptance correction methods

Sandvoss, Stephan A. January 2009 (has links)
Zugl.: Wuppertal, Univ., Diss., 2009
107

B-Identifikation im Level-2-Trigger des ATLAS-Experiments

Kootz, Andreas. January 2005 (has links) (PDF)
Wuppertal, Univ., Diss., 2005.
108

Untersuchungen über die Alterung und Reanimation von Driftröhren für das ATLAS-Myonspektrometer

Paschhoff, Volker. Unknown Date (has links) (PDF)
University, Diss., 1999--Freiburg (Breisgau). / Parallelt.: Studies on ageing and reanimation of drift tubes for the ATLAS muon spectrometer. Text engl.
109

Multi-Chip-Modul-Entwicklung für den ATLAS-Pixeldetektor Multi-Chip-Modul-Entwicklung für den ATLAS-Pixeldetektor Analyse der Front-End-Chip-Elektronik in strahlenharter 0,25-mm-Technologie [0,25-mym-Technologie] sowie Entwicklung und Realisierung eines Serial-Powering-Konzeptes /

Stockmanns, Tobias. January 2004 (has links) (PDF)
Universiẗat, Diss., 2004--Bonn.
110

Der sozio-politische Strukturwandel traditioneller gesellschaftlicher Organisationsformen im westlichen Hohen Atlas im ausgehenden 19. Jahrhundert /

Kaloumenos-Auf der Mauer, Nikolaus. January 1988 (has links)
Diss.--Philosophische Fakultät--Bonn--Rheinische Friedrich-Wilhelms-Universität, 1985.

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