Browsing Physics by Sponsor "Enterprise Ireland"
Now showing items 21-38 of 38
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Investigating the driving mechanisms of coronal mass ejections
(ESO, 2010)Aims. The objective of this study was to examine the kinematics of coronal mass ejections (CMEs) using EUV and coronagraph images, and to make a quantitative comparison with a number of theoretical models. One particular ... -
Laser triggered Z-pinch broadband extreme ultraviolet source for metrology
(2013)We compare the extreme ultraviolet emission characteristics of tin and galinstan (atomic %: Ga: 78.35, In: 14.93, Sn: 6.72) between 10 nm and 18 nm in a laser-triggered discharge between liquid metal-coated electrodes. ... -
Linewidth enhancement factor and modulation bandwidth of lattice matched 1.5 micron InGaAsN/GaAs quantum well lasers
(SPIE, 2004)The linewidth enhancement factors of lattice-matched 1.5 ?m wavelength InGaNAs/GaAs and InGaAs/InP singlequantum- well structures have been calculated using microscopic theory including many-body effects and a ... -
Magnetic excitations in a nanocontact
(American Physical Society, 2001)The domain wall in a ferromagnetic nanocontact adopts a specific configuration?Neel-like, vortex, or Bloch-like?depending on the dipole-dipole interactions governed by the size and shape of the contact and its atomic ... -
Magnetic field effects on the rest potential of ferromagnetic electrodes
(IEEE, 2002)The application of a magnetic field unexpectedly alters the rest potential of ferromagnetic electrodes in paramagnetic solutions of their salts. Anodic shifts of up to 60 mV in a field of 1 tesla were observed for 1Miron ... -
Magnetic noise in structured hard magnets
(2010)The anomalous Hall effect of wires patterned from ?Co90Fe10=Pt?n multilayers, with 10 n 50, is used to determine the magnetization process in a small volume of maze domains. Time-independent 1=f noise appears in ... -
Magnetoresistance and electrical hysteresis in stable half-metallic (La0.7Sr0.3 MnO3 and Fe3O4 nanoconstrictions
(American Institute of Physics, 2005)We have studied the transport properties of mechanically stable Fe3O4 and La0.7Sr0.3MnO3 nanoconstrictions patterned by focused ion-beam milling. The magnetoresistance decreases with the square of the applied voltage and ... -
Magnetoresistance of half-metallic oxide nanocontacts
(American Physical Society, 2001)The conductivity of a nanocontact between two crystallites of magnetite (Fe3O4) was studied. It was found that the conductivity can increase sixfold at room temperature in an applied field of 7 mT (70 Oe). This large ... -
Magnetoresistance of magnetite point contacts and nanoconstrictions
(American Institute of Physics, 2005)Point contacts of magnetite exhibit large, reversible increases of conductance by a factor of up to 5 in the presence of a small magnetic field (<10?mT), provided the conductance is less than the quantum of conductance G0 ... -
Many particle magnetic dipole-dipole and hydrodynamic interactions in magnetizable stent assisted magnetic drug targeting
(2010)The implant assisted magnetic targeted drug delivery system of Avil?es, Ebner and Ritter is considered both experimentally (in vitro) and theoretically. The results of a 2D mathematical model are compared with 3D experimental ... -
Multi-wavelength observations and modelling of a canonical solar flare
(ESO, 2009)Aims. We investigate the temporal evolution of temperature, emission measure, energy loss, and velocity in a C-class solar flare from both observational and theoretical perspectives. Methods. The properties of the flare ... -
Novel design for noise controlled semiconductor optical amplifier
(2009)The use of semiconductor optical amplifiers (SOA) in optical communications networks has so far been limited due to their inherent large noise figure (NF) compared to Erbium Doped Fibre Amplifiers. Therefore improvement ... -
Onset of rigidity for stretched string networks
(Institute of Physics, 2005)We define and analyse an elementary model for a network of strings with random natural lengths. As this system is expanded, a threshold is reached where some of the strings form a taut string network. Further expansion ... -
Optimisation of the synthesis and modification of CdTe quantum dots for enhanced live cell imaging
(Royal Society of Chemistry, 2006)We report the preparation and luminescence enhancement of thioglycolic acid (TGA) stabilised CdTe quantum dots (QDs) for use as live cell imaging tools in THP-1 macrophage cells. Short irradiating times utilising a high ... -
The two-dimensional viscous froth model for foam dynamics
(American Physical Society, 2004)The two-dimensional viscous froth model is a simple tractable model for foam rheology and coarsening. It includes, but is not confined to, the quasistatic regime. Here we present a detailed analysis and implementation of ... -
A Wind analysis of an evolved Giant. FUSE and HST/STIS observations of an eclipsing Symbiotic Binary
(European Space Agency, 2005)A major outstanding problem in stellar astrophysics lies in understanding the wind generation mechanism by which evolved giants lose mass. Phase-resolved observations of eclipsing symbiotic binary systems, containing ...