Viser treff 260-279 av 1579

• 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 ...
• Direct two-photon double ionization of H2 ﻿

(Peer reviewed; Journal article, 2012-06-05)
We have studied the process of direct (nonsequential) two-photon double ionization of molecular hydrogen (H2). Solving the time-dependent Schr¨odinger equation by an ab initio method, total (generalized) and singledifferential ...
• Directed flow of charged particles at mid-rapidity relative to the spectator plane in Pb-Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV ﻿

(Peer reviewed; Journal article, 2013-12)
The directed flow of charged particles at midrapidity is measured in Pb-Pb collisions at $\sqrt{s_{NN}}$.2.76 TeV relative to the collision plane defined by the spectator nucleons. Both, the rapidity odd $v_1^{odd}$ ...
• Directed Network of Substorms Using SuperMAG Ground‐Based Magnetometer Data ﻿

(Peer reviewed; Journal article, 2019)
We quantify the spatiotemporal evolution of the substorm ionospheric current system utilizing the SuperMAG 100+ magnetometers. We construct dynamical directed networks from this data for the first time. If the canonical ...
• Dispersion and two-phase flow in material from different carbonate pore classes ﻿

(Master thesis, 2008-06-02)
Carbonate reservoirs are currently estimated to contain more than 50 % of the world's oil reserves. The economical value of improving knowledge on fluid flow in these reservoirs is therefore vast. Carbonate reservoirs are ...
• Distribution of energetic oxygen and hydrogen in the near-Earth plasma sheet ﻿

(Peer reviewed; Journal article, 2015-05)
The spatial distributions of different ion species are useful indicators for plasma sheet dynamics. In this statistical study based on 7 years of Cluster observations, we establish the spatial distributions of oxygen ions ...
• Dos and Don’ts When Developing a System to Investigate Spontaneous Imbibition in Unconsolicdated Porous Media ﻿

(Peer reviewed; Journal article, 2019)
This paper describes the development of a consistent model system to measure spontaneous imbibition and determine saturation functions in unconsolidated porous media. Sand grains or glass beads were packed in up to 0.5 m ...
• Dose distribution in the thyroid gland following radiation therapy of breast cancer-a retrospective study ﻿

(Peer reviewed; Journal article, 2011-06-09)
Purpose: To relate the development of post-treatment hypothyroidism with the dose distribution within the thyroid gland in breast cancer (BC) patients treated with loco-regional radiotherapy (RT). Methods and materials: ...
• Dynamic effects of restoring footpoint symmetry on closed magnetic field lines ﻿

(Peer reviewed; Journal article, 2016-05-05)
Here we present an event where simultaneous global imaging of the aurora from both hemispheres reveals a large longitudinal shift of the nightside aurora of about 3 h, being the largest relative shift reported on from ...
• Dynamic properties of throat aurora revealed by simultaneous ground and satellite observations ﻿

(Peer reviewed; Journal article, 2017-03)
Throat aurora is defined as south-north aligned auroral arcs equatorward of the dayside cusp aurora and was suggested to be the results of cold magnetospheric plasma interaction with magnetopause reconnection, but its ...
• Dynamical grooming of QCD jets ﻿

(Journal article; Peer reviewed, 2020-02-06)
We propose a new class of infrared-collinear and Sudakov safe observables with an associated jet grooming technique that removes dynamically soft and large angle branches. It is based on identifying the hardest branch in ...
• Dynamics in the H2+ molecule, using a one dimensional model ﻿

(Master thesis, 2009-06-02)
A 1D model of the hydrogen molecular ion in the Born-Oppenheimer (BO) approximation. The making and testing of the model is described, as well as some underlying theory. The model also calculates non-BO effects.
• Dynamics of excited atoms and molecules interacting with external fields ﻿

(Doctoral thesis; Peer reviewed, 2013-08-30)
This thesis is a theoretical study of the behavior of electrons in atoms and molecules subjected to external electromagnetic fields. Three electronic systems have been central in this work, the atomic and quasimolecular ...
• The effect of calcite minerale on hydrate stability and CO2 adsorption ﻿

(Master thesis, 2011-06-01)
The background for conducting this study are the huge unused possibilities for storage of large quantities of the greenhouse gas carbon dioxide in old or depleted oil reservoirs or deep brackish aquifers. The method of ...
• Effect of Combined Low Salinity and Surfactant Injection on Oil Recovery in Aged Bentheimer Sandstones at Different Temperatures ﻿

(Master thesis, 2012-06-01)
A moderate increase in crude oil recovery by reduction in salinity of the injection brine has been observed for numerous laboratory core flood experiments. The underlying mechanisms behind increased recovery by low salinity ...
• Effect of different surfactant structures on the brine-crude oil and brine-alkane interface in different aqueous environments. ﻿

(Master thesis, 2017-06-16)
In producing oil fields, both the production rate and ultimate recovery from the field can be enhanced by injection of chemicals into the reservoir formation. To optimise the commercial benefits, it is important to understand ...
• The effect of energetic electron precipitation on the nitric oxide density in the lower thermosphere ﻿

(Doctoral thesis, 2007-02-09)
• Effect of Energetic Electron Precipitation on the Northern Polar Vortex: Explaining the QBO Modulation via Control of Meridional Circulation ﻿

(Peer reviewed; Journal article, 2019)
Energetic electron precipitation (EEP) affects the high‐latitude middle atmosphere by producing NOX compounds that destroy ozone. Earlier studies have shown that in the wintertime polar stratosphere, increased EEP enhances ...
• The effect of fluid viscosity and geometry on hydrocyclone performance ﻿

(Master thesis, 2015-02-02)
Hydrocyclones have been widely used throughout industries for separating sand particles of various sizes and shape from fluids. Producing petroleum resources includes amounts of water, which contain different amounts of ...