Now showing items 220-239 of 1453

• #### Development of a Transmitter for High Temperature Ultrasound Imaging ﻿

(Master thesis, 2016-06-01)
This thesis presents the development and testing of a new transmitter in an ultrasound imaging tool used for imaging the inside of oil wells in temperatures of up to 180 degrees Celsius. The imaging tool can have up to 288 ...
• #### Development of Electronic Ground System Equipment for the ASIM Project ﻿

(Master thesis, 2013-06-03)
ASIM (Atmosphere Space Interaction Monitor) is an instrument designed to monitor X-ray and gamma-ray bursts of terrestrial origin. ASIM is divided into two parts; Modular X-ray and Gamma-ray Sensor detect photons in the ...
• #### Development of Monte-Carlo Simulation Model of the UiB Gamma-ray tomography system using MCNP ﻿

(Master thesis, 2019-10-30)
• #### Development of Readout Electronics for a Digital Tracking Calorimeter ﻿

(Journal article; Peer reviewed, 2020)
Highly segmented digital tracking calorimeters consist of multiple layers of high-granularity pixel detector CMOS sensors and absorption/conversion layers. Two separate prototypes are being developed: (1) an electromagnetic ...
• #### Development, use, and validation of the CFD tool FLACS for hydrogen safety studies ﻿

(Doctoral thesis, 2010-06-18)
Computational Fluid Dynamics (CFD) calculations for gas explosion safety have been widely used for doing risk assessments within the oil and gas industry for more than a decade. Based on predicted consequences of a range ...
• #### Diagnosing CP properties of the 2HDM ﻿

(Peer reviewed; Journal article, 2014-01)
We have investigated a Two-Higgs-Doublet Model (2HDM), focusing on CP violation. Various scenarios with spontaneous and explicit breaking of CP have been considered. Some features of CP violation related to a choice of the ...
• #### Dielectron and heavy-quark production in inelastic and high-multiplicity proton–proton collisions at √s=13 TeV ﻿

(Peer reviewed; Journal article, 2019-01-10)
The measurement of dielectron production is presented as a function of invariant mass and transverse momentum () at midrapidity () in proton–proton (pp) collisions at a centre-of-mass energy of TeV. The contributions from ...
• #### Dielectron measurements in pp and Pb–Pb colllisions with ALICE at the LHC ﻿

(Peer reviewed; Journal article, 2019)
The production of low-mass dielectrons is one of the most promising tools for the investigation of chiral symmetry restoration and thermal radiation from the QGP created in heavy-ion collisions. To single out the signal ...
• #### Dielectron production in proton-proton collisions at √s=7 TeV ﻿

(Peer reviewed; Journal article, 2018-09-12)
The first measurement of e^+e^− pair production at mid-rapidity (|ηe| < 0.8) in pp collisions at √s=7 TeV with ALICE at the LHC is presented. The dielectron production is studied as a function of the invariant mass (m_ee ...
• #### Differential studies of inclusive J/$psi$ and $\psi$(2S) production at forward rapidity in Pb-Pb collisions at $\mathbf{\sqrt{{\textit s}_{_{NN}}}}$ = 2.76 TeV ﻿

(Peer reviewed; Journal article, 2016-05)
The production of J/\).psi\) and $\psi(2S)$ was measured with the ALICE detector in Pb-Pb collisions at the LHC. The measurement was performed at forward rapidity $2.5 < y < 4 \() down to zero transverse momentum ... • #### Diffusion as an Oil Recovery Mechanism During CO2 Injection in Fractured Reservoirs ﻿ (Master thesis, 2013-11-19) This thesis is part of an ongoing study of enhanced oil recovery by CO2 injection in the Reservoir Physics research group at the Department of Physics and Technology (IFT) at the University of Bergen. This work investigates ... • #### A Digital Tracking Calorimeter for Proton Computed Tomography ﻿ (Doctoral thesis, 2018-05-29) Cancer is a destructive disease, in which tumor cells grow out-of-control, halting organ function. Its treatment is threefold: Radical surgery, chemotherapy and radiation therapy. Their relative usage is determined by ... • #### Dijet azimuthal correlations and conditional yields in pp and p+Pb collisions at √sNN = 5.02 TeV with the ATLAS detector ﻿ (Peer reviewed; Journal article, 2019) This paper presents a measurement of forward-forward and forward-central dijet azimuthal angular correlations and conditional yields in proton-proton (pp) and proton-lead (p + Pb) collisions as a probe of the nuclear gluon ... • #### Dijet resonance search with weak supervision using √s = 13 TeV pp collisions in the ATLAS detector ﻿ (Journal article; Peer reviewed, 2020-09-21) This Letter describes a search for narrowly resonant new physics using a machine-learning anomaly detection procedure that does not rely on signal simulations for developing the analysis selection. Weakly supervised learning ... • #### Direct and indirect electron precipitation effect on nitric oxide in the polar middle atmosphere, using a full-range energy spectrum ﻿ (Peer reviewed; Journal article, 2017) In April 2010, a coronal mass ejection and a corotating interaction region on the Sun resulted in an energetic electron precipitation event in the Earth’s atmosphere. We investigate direct and indirect nitric oxide (NO) ... • #### Direct photon elliptic flow in Pb–Pb collisions at √sNN=2.76 TeV ﻿ (Peer reviewed; Journal article, 2019-02-10) The elliptic flow of inclusive and direct photons was measured at mid-rapidity in two centrality classes 0–20% and 20–40% in Pb–Pb collisions at TeV by ALICE. Photons were detected with the highly segmented electromagnetic ... • #### Direct photon elliptic flow in Pb–Pb collisions at √sNN=2.76 TeV ﻿ (Peer reviewed; Journal article, 2019) The elliptic flow of inclusive and direct photons was measured by ALICE for central and semi-central Pb–Pb collisionsat√sNN=2.76 TeV. The photons were reconstructed using the electromagnetic calorimeter PHOS and the ... • #### Direct photon production at low transverse momentum in proton-proton collisions at √s=2.76 and 8 TeV ﻿ (Peer reviewed; Journal article, 2019) Measurements of inclusive and direct photon production at midrapidity in pp collisions at √s = 2.76 and 8 TeV are presented by the ALICE experiment at the LHC. The results are reported in transverse momentum ranges of 0.4 ... • #### Direct photon production in Pb-Pb collisions at \(\sqrt{s_{NN}}$=2.76 TeV ﻿

(Peer reviewed; Journal article, 2016-03)
Direct photon production at mid-rapidity in Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV was studied in the transverse momentum range $0.9 < p_{\rm T} < 14$ GeV/$c$, Photons were detected via conversions in the ...
• #### Direct top-quark decay width measurement in the tt¯lepton+jets channel at √s=8 TeV with the ATLAS experiment ﻿

(Peer reviewed; Journal article, 2018-02-15)
This paper presents a direct measurement of the decay width of the top quark using tt¯ events in the lepton+jets final state. The data sample was collected by the ATLAS detector at the LHC in proton–proton collisions at a ...