Now showing items 883-902 of 976

• #### Spontaneous symmetry breaking in three-Higgs-doublet $S_3$-symmetric models ﻿

(IOP, 2017)
The talk summarises work done by the authors consisting of a detailed study of the possible vacua in models with three Higgs doublets with $S_3$ symmetry and without explicit CP violation. Different vacua require special ...
Journal article
• #### Stabilization of circular Rydberg atoms by circularly polarized infrared laser fields ﻿

(American Physical Society, 2011-09-29)
The ionization dynamics of circular Rydberg states in strong circularly polarized infrared (800 nm) laser fields is studied by means of numerical simulations with the time-dependent Schr¨odinger equation. We find that at ...
Peer reviewedJournal article
• #### Strange particle production in proton–proton collisions at s=09 with ALICE at the LHC The ALICE Collaboration ﻿

(Springer, 2011-03-30)
The production of mesons containing strange quarks (, φ) and both singly and doubly strange baryons (, , and ) are measured at mid-rapidity in pp collisions at s = 0.9 TeV with the ALICE experiment at the LHC. The results ...
Peer reviewedJournal article
• #### Studier av algoritmer for tau-identifikasjon ﻿

(The University of Bergen, 2010-05-31)
Mange signaturer for ny fysikk i ATLAS vil henfalle til eit eller fleire tau-lepton. Derfor har ATLAS utvikla verktøy for identifikasjon av tau-lepton som henfall eit eller fleire pion. Verktøya er kompliserte og inneheld ...
Master thesis
• #### Studies of $Z\gamma$ production in association with a high-mass dijet system in $pp$ collisions at $\sqrt{s}=$ 8 TeV with the ATLAS detector ﻿

(Springer, 2017-07)
The production of a $Z$ boson and a photon in association with a high-mass dijet system is studied using 20.2fb$^{-1}$ of proton-proton collision data at a centre-of-mass energy of $\sqrt{s}$ = 8 TeV recorded with the ATLAS ...
Journal article
• #### Studies of the performance of the ATLAS detector using cosmic-ray muons ﻿

(Springer, 2011-03-29)
Muons from cosmic-ray interactions in the atmosphere provide a high-statistics source of particles that can be used to study the performance and calibration of the ATLAS detector. Cosmic-ray muons can penetrate to the ...
Peer reviewedJournal article
• #### Studies on the solid-state transformation and chemical modification reactions of carbon black nanoparticles ﻿

(The University of Bergen, 2015-06-26)
Carbon black (CB) is nanoscale particles with quasi-spherical nature, produced from incomplete combustion of hydrocarbons. It is a well-known type of amorphous carbon which exists in the form of aggregated spheres. CBs are ...
Doctoral thesis
• #### A study of capillary pressure and capillary continuity in fractured rocks ﻿

(The University of Bergen, 2008-09-05)
The production of oil is challenging in fractured reservoirs due to the large transmissibility contrast between matrix and fracture, and primary recovery is often low. The recovery efficiency depends on the relationship ...
Doctoral thesis
• #### Study of Gas Mobility Control during CO2 Injection for Enhanced Oil Recovery ﻿

(The University of Bergen, 2016-06-01)
Carbon Dioxide (CO2) has been used as a commercial source for Enhanced Oil Recovery (EOR) for over 40 years. In recent years, the utilization of anthropogenic CO2 has become more attractive, because of its proven EOR ...
Master thesis
• #### Study of heavy-flavor quarks produced in association with top-quark pairs at √s =7 TeV using the ATLAS detector ﻿

(American Physical Society, 2014-04-21)
Using a sample of dilepton top-quark pair (tt¯) candidate events, a study is performed of the production of top-quark pairs together with heavy-flavor (HF) quarks, the sum of tt¯+b+X and tt¯+c+X, collectively referred to ...
Journal article
• #### Study of leading hadrons in gluon and quark fragmentation ﻿

(Elsevier, 2006-12)
The study of quark jets in e+e− reactions at LEP has demonstrated that the hadronisation process is reproduced well by the Lund string model. However, our understanding of gluon fragmentation is less complete. In this study ...
Journal article
• #### A study of mass reconstruction in Z°→τ+τ- ﻿

(The University of Bergen, 2010-05-28)
Neutrinos escaping detection is one of the main problems in mass reconstruction with tau leptons. They must be neglected or corrected for in some way. This thesis discusses two methods of handling the neutrinos in ...
Master thesis
• #### Study of meso-scale reversed flow events in the polar ionosphere by SuperDARN radars ﻿

(The University of Bergen, 2017-06-29)
In this study we have investigated Reversed Flow Events (RFEs) in the northern hemisphere polar cap. A RFE is an ∼50-250 km wide flow channel that opposes the large scale background flow. A total of 57 new RFEs were ...
Master thesis
• #### A study of selected problems related to accidental process fires ﻿

(The University of Bergen, 2011-04-15)
An experimental full scale characterization of a turbulent propane jet flame has been made in terms of temperatures and radiation. Sonic propane gas releases were achieved at steady pressure and near steady flow. Commercial ...
Doctoral thesis
• #### A study of temperature profiles in ceiling jets under horizontal unconfined ceilings with the CFD tools FLACS and FDS ﻿

(The University of Bergen, 2017-06-22)
The key to controlling accidental fires, is early detection by the correct placement of devices such as smoke detectors and sprinkler systems. Smoke is accompanied by a temperature rise, brought about by the ceiling jet ...
Master thesis
• #### A study of the b-quark fragmentation function with the DELPHI detector at LEP I and an averaged distribution obtained at the Z Pole ﻿

(Springer, 2011-02-23)
The nature of b-quark jet hadronisation has been investigated using data taken at the Z peak by the DELPHI detector at LEP. Two complementarymethods are used to reconstruct the energy of weakly decaying b-hadrons, ...
Peer reviewedJournal article
• #### A study of the Coriolis flowmeter as a reference instrument in multiphase flow ﻿

(The University of Bergen, 2015-09-11)
The objective of this thesis was to investigate how a two-liquid mixture, and injected gas, affects the measurements of a Coriolis flowmeter. Furthermore it was of interest to investigate whether entrained gas could be ...
Master thesis
• #### Study of the dependence of direct soft photon production on the jet characteristics in hadronic Z0 decays ﻿

(Springer, 2010-06-09)
An analysis of the direct soft photon production rate as a function of the parent jet characteristics is presented, based on hadronic events collected by the DELPHI experiment at LEP1. The dependences of the photon rates ...
Peer reviewedJournal article
• #### Study of the flow in a hydrocyclone using positron emission particle tracking and computational fluid dynamics simulation ﻿

(The University of Bergen, 2016-06-22)
This thesis presents my work of studying the flow in a hydrocyclone using positron emission particle tracking (PEPT) and computational fluid dynamics (CFD) simulation. Hydrocyclone separators are a type of cyclone separators ...
Doctoral thesis
• #### Study on viability of Gain Stabilization of SiPMs and determination of b-quark fragmentation fraction ratio f_c/f_u in pp collisions at √s = 13 TeV with the ATLAS detector ﻿

(The University of Bergen, 2017-09-05)
Gain Stabilization of SiPMs through the usage of an external board to regulate bias voltage based on temperature yields a variation in gain of less than 0.5 % using a system of four SiPMs with temperature readout in close ...
Master thesis