Now showing items 1175-1194 of 1848

• #### On the Persistent Shape and Coherence of Pulsating Auroral Patches ﻿

(Peer reviewed; Journal article, 2018-05)
The pulsating aurora covers a broad range of fluctuating shapes that are poorly characterized. The purpose of this paper is therefore to provide objective and quantitative measures of the extent to which pulsating auroral ...
• #### On the Presence and Thermalization of Cold Ions in the Exhaust of Antiparallel Symmetric Reconnection ﻿

(Journal article; Peer reviewed, 2021)
Using fully kinetic 2.5 dimensional particle-in-cell simulations of anti-parallel symmetric magnetic reconnection, we investigate how initially cold ions are captured by the reconnection process, and how they evolve and ...
• #### On the Production of Ionospheric Irregularities Via Kelvin-Helmholtz Instability Associated with Cusp Flow Channels ﻿

(Journal article; Peer reviewed, 2020)
We present a multi‐instrument multiscale study of a channel of enhanced, inhomogeneous flow in the cusp ionosphere occurring on November 30, 2014. We provide evidence that strong Global Navigation Satellite System (GNSS) ...
• #### On the timing between terrestrial gamma ray flashes, radio atmospherics, and optical lightning emission ﻿

(Peer reviewed; Journal article, 2017)
On 25 October 2012 the Reuven Ramaty High Energy Solar Spectroscope Imager (RHESSI) and the Tropical Rainfall Measuring Mission (TRMM) satellites passed over a thunderstorm on the coast of Sri Lanka. RHESSI observed a ...
• #### On-line dose-guidance to account for inter-fractional motion during proton therapy ﻿

(Peer reviewed; Journal article, 2019-01)
Background and purpose Proton therapy (PT) of extra-cranial tumour sites is challenged by density changes caused by inter-fractional organ motion. In this study we investigate on-line dose-guided PT (DGPT) to account ...
• #### On-line X-ray fluorescence analysis applied to industrial processes and environmental monitoring ﻿

(Master thesis, 2000)
Abstract X-ray stimulated fluorescence analysis is a powerful and widely used tool for determining the concentration of chemical species in materials. Presently, this is done by taking and preparing samples for off-line ...
• #### One-dimensional charged kaon femtoscopy in p-Pb collisions at √sNN = 5.02 TeV ﻿

(Peer reviewed; Journal article, 2019)
The correlations of identical charged kaons were measured in p-Pb collisions at √sNN = 5.02 TeV by the ALICE experiment at the LHC. The femtoscopic invariant radii and correlation strengths were extracted from one-dimensional ...
• #### One-dimensional pion, kaon, and proton femtoscopy in Pb-Pb collisions at $\sqrt{s_{\rm {NN}}}$ =2.76 TeV ﻿

(Peer reviewed; Journal article, 2015-11)
The size of the particle emission region in high-energy collisions can be deduced using the femtoscopic correlations of particle pairs at low relative momentum. Such correlations arise due to quantum statistics and Coulomb ...
• #### Online data compression in the ALICE O$^2$ facility ﻿

(Peer reviewed; Journal article, 2017)
The ALICE Collaboration and the ALICE O2 project have carried out detailed studies for a new online computing facility planned to be deployed for Run 3 of the Large Hadron Collider (LHC) at CERN. Some of the main aspects ...
• #### Onset of smoldering and transition to flaming fire ﻿

(Doctoral thesis; Peer reviewed, 2013-06-28)
Aim: The aim of this work has been to investigate the effects of density, heat flux and boundary conditions on smoldering. Two focus areas were chosen: the onset of smoldering and the transition from smoldering to flaming ...
• #### Onset of Spontaneous Imbibition ﻿

(Master thesis, 2017-06-22)
The spontaneous imbibition process in porous media is an important recovery mechanism and is governed by capillary forces that arise when two immiscible fluids are present in the pore space. This thesis presents new ...
• #### Open heavy-flavour production and elliptic flow in p-Pb collisions at the LHC with ALICE ﻿

(Peer reviewed; Journal article, 2019)
Measurements of open heavy flavour production in p–A collisions allow the investigation of Cold Nuclear Matter effects. In addition, they are an important tool for a complementary investigation of the long-range correlations ...
• #### Operation and performance of the ATLAS Tile Calorimeter in Run 1 ﻿

(Peer reviewed; Journal article, 2018-11-30)
The Tile Calorimeter is the hadron calorimeter covering the central region of the ATLAS experiment at the Large Hadron Collider. Approximately 10,000 photomultipliers collect light from scintillating tiles acting as the ...
• #### Optical emissions associated with narrow bipolar events from thunderstorm clouds penetrating into the stratosphere ﻿

(Journal article; Peer reviewed, 2021)
Narrow bipolar events (NBEs) are signatures in radio signals from thunderstorms observed by ground-based receivers. NBEs may occur at the onset of lightning, but the discharge process is not well understood. Here, we present ...
• #### Optical spectroscopy for tissue diagnostics and treatment control ﻿

(Doctoral thesis, 2006-06-28)
Biomedical Optics as an interdisciplinary field of science has been developed during many years and is experiencing tremendous growth, to cover a wide range of optical techniques and methods, utilized for medical therapeutic ...
• #### Optical velocity meter based on Ramsey oscillations in a double-grating setup ﻿

(Peer reviewed; Journal article, 2014-04)
We propose a method for measuring velocities of atoms or molecules in a gas phase based on time-resolved laser experiments. Two intensity gratings of electromagnetic field with variable time delay τ are created by interfering ...
• #### Optimisation of large-radius jet reconstruction for the ATLAS detector in 13 TeV proton–proton collisions ﻿

(Journal article; Peer reviewed, 2021)
Jet substructure has provided new opportunities for searches and measurements at the LHC, and has seen continuous development since the optimization of the large-radius jet definition used by ATLAS was performed during Run ...
• #### Optimization of proton therapy plans with respect to biological and physical dose distributions ﻿

(Master thesis, 2018-06-16)
Introduction: Proton therapy is a radiation treatment method growing around the world. This is mainly due to the protons ability to deposit dose more conformal compared to conventional photon therapy. Protons also differ ...
• #### Optimization, evaluation and application of EEP measurements in the presence of contaminating protons ﻿

(Master thesis, 2017)
It is well known that energetic particles can penetrate deep into the atmosphere and initiate a chain of chemical reactions, ultimately leading to enhanced production rates of HOx and NOx molecules and the depletion of ...
• #### Optimizing hydroxyl airglow retrievals from long-slit astronomical spectroscopic observations ﻿

(Peer reviewed; Journal article, 2017-08-25)
Astronomical spectroscopic observations from ground-based telescopes contain background emission lines from the terrestrial atmosphere's airglow. In the near infrared, this background is composed mainly of emission from ...