57,805 research outputs found
Stor oro för funktionshinderpolitik
No full textArtikel om rapporten "Funktionshinderspolitik? - röster från den organiserade funktionshinderrörelsen om olika politikområden (Lundälv, Jörgen, Larsson, Per Olof). (2017). Rapport. Institutionen för socialt arbete, Göteborgs universite
Minoritarian Activism – Judicial Politics in the European Union
No full textAbstract
Is the Court of Justice of the EU (CJEU) best described as a run-away
agent, free to influence the EU according to its own preferences, or as an
obedient servant of EU member state governments? In this dissertation,
Olof Larsson argues that neither description fits the CJEU. Rather, the
CJEU is dependent upon the support of at least a minority of EU member
states in order to be able to change the EU in ways counter to the
wishes of the majority. The CJEU has not become one of the most
powerful institutions of the EU because it has been insulated from government
pressures, but rather because the governments of the EU have
been divided on most of the important issues. Inspired by Separation-of-
Powers theories developed to explain the Supreme Court of the United
States, it is argued that these divisions among the member states has
been an underestimated factor in explaining the independence of the
CJEU. Correspondingly, the more united the governments are against
the Court, the higher the risk of backlashes, i.e. political attacks against
the Court or attempts to change the impact of its decisions.
The dissertation is composed of four empirical chapters, two of which
have previously been published in peer-reviewed journals. In the first,
Larsson and co-authors argue that the CJEU reacts to the stated preferences
of the EU member states in ways which can best be explained
as a strategic adaptation in order to minimize the risk of backlashes. In
the second, Larsson argues that such backlashes have happened. In the
third, Larsson and co-authors argue that the most fundamental division
among the EU member states in regards to the issues the CJEU handles
is one between Liberal and Social Market Economies. In the fourth
and final empirical chapter it is argued that the CJEU also uses legal
arguments, in the form of references to precedent, in order to convince
recalcitrant governments of the validity of its judgments. In short, the
CJEU both listens to and speaks back to EU governments. These governments
are often divided along lines separating Social from Liberal
Market Economies, but when they are sufficiently united, backlashes
against the CJEU do happen
Manipulating the Spin Polarization of Excitons in a Single Quantum Dot by Optical Means
No full textCircular polarization studies of photoluminescence from the neutral (X0) and the positively charged (X+) exciton are reported for individual InAs/GaAs quantum dots (QDs). High polarization degrees, 60 % for X0 and 73 % for X+, were recorded without any external magnetic field applied. These studies show that that the QD polarization and population dynamics are controllable either by varying the photo-excitation intensity, or by using a second IR laser excitation.Original Publication:Arvid Larsson, Evgenii Moskalenko and Per-Olof Holtz, Manipulating the Spin Polarization of Excitons in a Single Quantum Dot by Optical Means, 2011, Applied Physics Letters, (98), 7, 071906.http://dx.doi.org/10.1063/1.3554422Copyright: American Institute of Physicshttp://www.aip.org
Can member states override the court of justice of the EU?
No full textRulings made in the Court of Justice of the European Union often generate controversy in the member states, but how can national governments respond to decisions they disagree with? Drawing on a new study, Olof Larsson explains the use of ‘overrides’, where laws are changed following a ruling to bring them more in line with what national politicians want
Spin polarization of the neutral exciton in a single InAs quantum dot at zero magnetic field
No full textA high degree of spin polarization for the neutral exciton in individual quantum dots, at zero external magnetic field, is monitored. While a high polarization degree is commonly observed for the charged exciton, a negligible polarization has been predicted for the neutral exciton. The exceptionally high polarization (andgt;60%) observed here is explained in terms of a dynamical nuclear polarization field, stabilizing the electron spin. Such polarization of the quantum dot nuclei, in case of the neutral exciton, is possible due to unequal capture time of electrons and holes.Original Publication:Evgenii Moskalenko, L A Larsson and Per-Olof Holtz, Spin polarization of the neutral exciton in a single InAs quantum dot at zero magnetic field, 2009, PHYSICAL REVIEW B, (80), 19, 193413.http://dx.doi.org/10.1103/PhysRevB.80.193413Copyright: American Physical Societyhttp://www.aps.org
Examination of railway track dynamic models capabilities against measured field data
No full textThe performance of railway track under dynamic loading is extremely complex due to the interdependent and sometimes non-linear behaviours of track components. Many and varied computer models of train-track dynamics have been developed around the world to try and analyse these behaviours. To compare, test and validate the capabilities and outputs of six available computer models, an evaluation exercise was undertaken to benchmark the participating models against each other and against measured field data collected at a track test site in Victoria, Australia. The outcomes of this paper will assist railway engineers in selecting an appropriate model for their requirements
Spin polarization of neutral excitons in quantum dots: the role of the carrier collection area
No full textA high degree (approximate to 55%) of circular polarization has been observed for the neutral exciton in InAs/GaAs quantum dots (QDs). The possibility to record non- zero polarization of the neutral exciton is explained in terms of different capture times of the light electron compared with the heavier holes into the QDs from the wetting layer. This interpretation is supported by the progressive reduction of the polarization degree with increasing QD density, and also with increasing temperature.Original Publication:Evgenii Moskalenko, Arvid Larsson and Per-Olof Holtz, Spin polarization of neutral excitons in quantum dots: the role of the carrier collection area, 2010, NANOTECHNOLOGY, (21), 34, 345501.http://dx.doi.org/10.1088/0957-4484/21/34/345401Copyright: Institute of Physics; 1999http://www.iop.org
Effective tuning of the charge state of a single InAs/GaAs quantum dot by an external magnetic field
No full textA microphotoluminescence study of single InAs/GaAs quantum dots (QDs) in the presence of an applied external magnetic field is presented. Attention is focused on the redistribution between the spectral lines of a single QD observed at increasing magnetic field parallel to the growth direction (Faraday geometry). The redistribution effect is explained by considering the electron drift velocity in the QD plane that affects the probability for capture into the QD. In contrast, no redistribution is observed when applying the magnetic field perpendicular to the growth direction (Voigt geometry).Original Publication: Evgenii Moskalenko, Andréas Larsson, Mats Larsson, Per-Olof Holtz, W. V. Schoenfeld and P. M. Petroff, Effective tuning of the charge state of a single InAs/GaAs quantum dot by an external magnetic field, 2008, Physical Review B Condensed Matter, (78), 075306. http://dx.doi.org/10.1103/PhysRevB.78.075306 Copyright: American Physical Society http://www.aps.org/</p
DigiTrust – Ett tvärvetenskapligt projekt
No full textDetta är introduktionskapitet till rapporten "DigiTrust: Tillit i det digitala. Tvärvetenskapliga perspektiv från ett forskningsprojekt", där forskargruppsledarna beskriver grunderna för projektet
Carrier transport in self-organized InAs/GaAs quantum-dot structures studied by single-dot spectroscopy
No full textA microphotoluminescence study of single InAs/GaAs quantum dots subjected to a lateral external electric field gives insight into carrier transport and capture processes into Stranski-Krastanov-grown quantum dots. The results obtained on the excitons in a single dot demonstrate a considerable luminescence intensity enhancement of the dot as well as a charge redistribution when an electric field is applied. The charge reconfiguration is evidenced by the transition from a predominantly negatively charged to a neutral charge state of the exciton. The model proposed to explain the charge redistribution is based on an effective hole localization at the potential fluctuations of the wetting layer.Original Publication:Evgenii Moskalenko, Mats Larsson, Per-Olof Holtz, W. V. Schoenfeld and P. M. Petroff, Carrier transport in self-organized InAs/GaAs quantum-dot structures studied by single-dot spectroscopy, 2006, Physical Review B, (73), 155336.http://dx.doi.org/10.1103/PhysRevB.73.155336Copyright: American Physical Societyhttp://www.aps.org
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