Now showing items 21-40 of 533

• #### Network analysis of geomagnetic substorms using the SuperMAG database of ground-based magnetometer stations ﻿

(Wiley, 2015-09-26)
The overall morphology and dynamics of magnetospheric substorms is well established in terms of the observed qualitative auroral features seen in ground-based magnetometers. This paper focuses on the quantitative ...
Journal article
• #### Combined positron emission tomography and computed tomography to visualize and quantify fluid flow in sedimentary rocks ﻿

(AGU (American Geophysical Union) Publications, 2015-09-22)
Here we show for the first time the combined positron emission tomography (PET) and computed tomography (CT) imaging of flow processes within porous rocks to quantify the development in local fluid saturations. The coupling ...
Journal article
• #### Nonlinear echoes from encapsulated antibubbles ﻿

(Elsevier B.V., 2015-09-19)
An antibubble consists of a liquid droplet, surrounded by a gas, often with an encapsulating shell. Antibubbles of microscopic sizes suspended in fluids are acoustically active in the ultrasonic range. Antibubbles have ...
Journal article
• #### Birkeland current effects on high-latitude ground magnetic field perturbations ﻿

(Wiley, 2015-09-18)
Magnetic perturbations on ground at high latitudes are directly associated only with the divergence-free component of the height-integrated horizontal ionospheric current, J⊥,df. Here we show how J⊥,df can be expressed as ...
Journal article
• #### Flow visualization of CO2 in tight shale formations at reservoir conditions ﻿

(Agu publications, 2015-09-18)
The flow of CO2 in porous media is fundamental to many engineering applications and geophysical processes. Yet detailed CO2 flow visualization remains challenging. We address this problem via positron emission tomography ...
Journal article
• #### ALICE TPC Upgrade Activities for LHC Run 3 and Beyond: "SAMPA ASIC Tests with GEM Detector Prototype" ﻿

(The University of Bergen, 2015-09-11)
The Time Projection Chamber (TPC) signal readout of the ALICE detector is being upgraded to accommodate the higher collision rates and -energies during LHC Run 3 in 2018. Due to the increased collision rates, the TPC drift ...
Master thesis
• #### Near-surface petrochemical sensing using coplanar waveguides ﻿

(The University of Bergen, 2015-09-11)
The project studies the ability of coplanar waveguide sensor in sensing thin layers of petrochemical liquid. A coplanar waveguide is built on flexible printable circuit board partially based on an existing design. Two ...
Master thesis
• #### 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
• #### Measurement of charged-particle spectra in Pb+Pb collisions at (Formula presented.) = 2.76 TeV with the ATLAS detector at the LHC ﻿

(Springer, 2015-09-09)
Charged-particle spectra obtained in Pb+Pb interactions at sNN−−−√=2.76 TeV and pp interactions at sNN−−−√=2.76 TeV with the ATLAS detector at the LHC are presented, using data with integrated luminosities of 0.15 nb−1 and ...
Journal article
• #### Measurement of the forward-backward asymmetry of electron and muon pair-production in pp collisions at (Formula Presented.) = 7 TeV with the ATLAS detector ﻿

(Springer, 2015-09-09)
This paper presents measurements from the ATLAS experiment of the forward-backward asymmetry in the reaction pp → Z/γ * → l + l −, with l being electrons or muons, and the extraction of the effective weak mixing angle. The ...
Journal article
• #### Search for heavy lepton resonances decaying to a $Z$ boson and a lepton in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector ﻿

(Springer, 2015-09)
A search for heavy leptons decaying to a $Z$ boson and an electron or a muon is presented. The search is based on $pp$ collision data taken at $\sqrt{s}=8$ TeV by the ATLAS experiment at the CERN Large Hadron Collider, ...
Journal article
• #### Medical physics aspects of the synchrotron radiation therapies: Microbeam radiation therapy (MRT) and synchrotron stereotactic radiotherapy (SSRT) ﻿

(Elsevier, 2015-09)
Stereotactic Synchrotron Radiotherapy (SSRT) and Microbeam Radiation Therapy (MRT) are both novel approaches to treat brain tumor and potentially other tumors using synchrotron radiation. Although the techniques differ by ...
Journal article
• #### Testing hadronic interaction models using a highly granular silicon-tungsten calorimeter ﻿

(Elsevier, 2015-09)
Journal article
• #### Neutral Pion Production in p-Pb Collisions at √s^NN = 5.02 TeV with ALICE PHOS at the LHC ﻿

(The University of Bergen, 2015-08-24)
In this thesis, the neutral mesons measurement with ALICE PHOS at the LHC is presented. Depending on the technical design of PHOS and its momentum reach, the strategies of the neutral mesons extraction by invariant mass ...
Master thesis
• #### Search for heavy long-lived multi-charged particles in $pp$ collisions at $\sqrt{s}$=8 TeV using the ATLAS detector ﻿

(Springer, 2015-08)
A search for heavy long-lived multi-charged particles is performed using the ATLAS detector at the LHC. Data collected in 2012 at $\sqrt{s}$=8 TeV from $pp$ collisions corresponding to an integrated luminosity of $20.3$ ...
Journal article
• #### A search for high-mass resonances decaying to $\tau^{+}\tau^{-}$ in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector ﻿

(Springer, 2015-07-29)
A search for high-mass resonances decaying into $\tau^{+}\tau^{-}$ final states using proton-proton collisions at $\sqrt{s}= 8$ TeV produced by the Large Hadron Collider is presented. The data were recorded with the ATLAS ...
Journal article
• #### Search for the Standard Model Higgs boson produced in association with top quarks and decaying into $b\bar{b}$ in pp collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector ﻿

(Springer, 2015-07-29)
A search for the Standard Model Higgs boson produced in association with a pair of top quarks, $t\bar{t}H$, is presented. The analysis uses 20.3 fb$^{-1}$ of pp collision data at $\sqrt{s}$ = 8 TeV, collected with the ATLAS ...
Journal article
• #### The science case for the EISCAT_3D radar ﻿

(Springer, 2015-07-29)
The EISCAT (European Incoherent SCATer) Scientific Association has provided versatile incoherent scatter (IS) radar facilities on the mainland of northern Scandinavia (the EISCAT UHF and VHF radar systems) and on Svalbard ...
Journal article
• #### Neutral Pion Production in pp Collisions at √s = 2.76 TeV at the LHC with the ALICE Detector using the Electromagnetic Calorimeter ﻿

(The University of Bergen, 2015-07-13)
In this thesis the measurement of the neutral pion yield and its differential invariant cross section in pp collisions at √s = 2.76 TeV is presented. The π^0 s are measured in the two photon decay channel and photons are ...
Master thesis
• #### Inclusive, prompt and non-prompt J/ψ production at mid-rapidity in Pb-Pb collisions at √sNN = 2.76 TeV ﻿

(Springer, 2015-07-10)
The transverse momentum (p T) dependence of the nuclear modification factor R AA and the centrality dependence of the average transverse momentum 〈p T〉 for inclusive J/ψ have been measured with ALICE for Pb-Pb collisions ...
Journal article