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Ag Taispeaint Torthaí 151 - 175 de 3195 ar leathanach 7 de 128
Marcáilte
Marcáil
Excited-state spectroscopy of singly, doubly and triply-charmed baryons from lattice QCD
(2013)
PEARDON, MICHAEL
Excited-state spectroscopy of singly, doubly and triply-charmed baryons from lattice QCD
(2013)
PEARDON, MICHAEL
Achomaireacht:
We present the ground and excited state spectra of singly, doubly and triply-charmed baryons by using dynamical lattice QCD. A large set of baryonic operators that respect the symmetries of the lattice and are obtained after subduction from their continuum analogues are utilized. These operators transform as irreducible representations of SU(3)F symmetry for flavour, SU(4) symmetry for Dirac spins of quarks and O(3) symmetry for orbital angular momenta. Using novel computational techniques correlation functions of these operators are generated and the variational method is exploited to extract excited states. The lattice spectra that we obtain have baryonic states with well-defined total spins up to 7/2 and the low lying states remarkably resemble the expectations of quantum numbers from SU(6)?O(3) symmetry.
http://hdl.handle.net/2262/72888
Marcáilte
Marcáil
Abelian and non-Abelian Hopfions in all odd dimensions
(2014)
Radu, Eugen; Tchrakian, D.H.
Abelian and non-Abelian Hopfions in all odd dimensions
(2014)
Radu, Eugen; Tchrakian, D.H.
Achomaireacht:
We extend the definition of the topological charge pertaining to the CP1 (i.e. O(3)) Skyrme-Fadde’ev Hopfion on IR3, to candidates for topological charges of CPn sigma models on IR2n+1, for all n. For this, the Abelian composite connections of the CPn sigma models are employed. In higher dimensions (n ≥ 1) it turns out that such charges, described by the non- Abelian composite connections of suitable Grassmannian sigma models, can also be constructed. A concrete discussion of the non-Abelian case for n = 2 is presented.
http://eprints.maynoothuniversity.ie/6180/
Marcáilte
Marcáil
Blowing of polycrystalline silicon fuses
(2010)
Lee, William T.; Fowler, Andrew C; Power, O; Healy, S; Browne, J
Blowing of polycrystalline silicon fuses
(2010)
Lee, William T.; Fowler, Andrew C; Power, O; Healy, S; Browne, J
Achomaireacht:
Polycrystalline silicon fuses are one time programmable memory elements which allow the calibration of integrated circuits at wafer and package level. We present a zero-dimensional lumped parameter model of the programming of fuses made from a combination of tungsten silicide and polycrystalline silicon. The components of the model are an electrical model, a thermal model, and a flow model. The model generates quantitatively accurate results and reproduces trends with applied voltage and fuse size. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3457469]
PUBLISHED
peer-reviewed
http://hdl.handle.net/10344/5034
Marcáilte
Marcáil
Waves in Guinness
(2008)
Robinson, Marguerite; Fowler, Andrew C; Alexander, A.J; O'Brien, Stephen BG
Waves in Guinness
(2008)
Robinson, Marguerite; Fowler, Andrew C; Alexander, A.J; O'Brien, Stephen BG
Achomaireacht:
We describe a simple model of a bubbly two-phase flow which is able to explain why waves propagate downward when a pint of Guinness is poured, and also how the waves are generated. Our theory involves a physically based regularization of the basic equations of the two-phase flow, using interphasic pressure difference and virtual mass terms, together with bulk or eddy viscosity terms. We show that waves can occur through an instability analogous to that which forms roll waves in inclined fluid flows, and we provide a description of the form of these waves, and compare them to observations. Our theory provides a platform for the description of waves in more general bubbly two-phase flows, and the way in which the flow breaks down to form slug flow. (C) 2008 American Institute of Physics.
PUBLISHED
peer-reviewed
http://hdl.handle.net/10344/5039
Marcáilte
Marcáil
Picosecond degenerate four-wave mixing in organic materials
(1986)
Maloney, Colette
Picosecond degenerate four-wave mixing in organic materials
(1986)
Maloney, Colette
Achomaireacht:
THESIS 1282
http://hdl.handle.net/2262/76950
Marcáilte
Marcáil
Numerical simulations concerning the propagation of protostellar jets
(2008)
Moraghan, Anthony
Numerical simulations concerning the propagation of protostellar jets
(2008)
Moraghan, Anthony
Achomaireacht:
THESIS 8592
http://hdl.handle.net/2262/76992
Marcáilte
Marcáil
Linear and nonlinear optical properties of low-dimensional structures on vicinal silicon (111) surfaces
(2008)
Jacob, Julie
Linear and nonlinear optical properties of low-dimensional structures on vicinal silicon (111) surfaces
(2008)
Jacob, Julie
Achomaireacht:
THESIS 8347
http://hdl.handle.net/2262/77033
Marcáilte
Marcáil
Optical and X-ray characterization of the magnetic properties of gold capped cobalt nanowires grown on Pt(997)
(2011)
Cunniffe, John Patrick
Optical and X-ray characterization of the magnetic properties of gold capped cobalt nanowires grown on Pt(997)
(2011)
Cunniffe, John Patrick
Achomaireacht:
THESIS 9061
http://hdl.handle.net/2262/77021
Marcáilte
Marcáil
Kinematic properties of globally-propagating waves in the solar corona
(2012)
Long, David M.
Kinematic properties of globally-propagating waves in the solar corona
(2012)
Long, David M.
Achomaireacht:
THESIS 9601
Globally-propagating bright fronts in the solar corona are a poorly understood phenomena despite almost 15 years of research. Here, the kinematics and morphology of these disturbances are studied using Extreme UltraViolet (EUV) observations from the Solar Terrestrial RElations Observatory (STEREO) and Solar Dynamic Observatory (SDO) spacecraft. The first observations of a coronal bright front (CBF) made using STEREO are presented, with the pulse observed in all four EUV passbands, namely 171, 195, 284, and for the first time, 304 A. The pulse exhibited similar kinematics in all passbands studied, with a velocity peak of 238+-20 km s-1 within ~28 minutes of launch and acceleration varying from 76 m s-2 to -102 m s-2 observed in the 304 A passband. Similar kinematics are found in the 195 A passband, while lower values were found in the lower cadence 284 A passband. The higher cadence 171 A passband shows much stronger variation, with the velocity peaking at 475+-47 km ...
http://hdl.handle.net/2262/77043
Marcáilte
Marcáil
The evolution and space weather effects of solar coronal holes
(2011)
Krista, Larisza D.
The evolution and space weather effects of solar coronal holes
(2011)
Krista, Larisza D.
Achomaireacht:
THESIS 9170
In recent years the role of space weather forecasting has grown tremendously as our society increasingly relies on satellite dependent technologies. As solar activity is the foremost important aspect of space weather, the forecasting of are and CME related transient geomagnetic storms has become a primary initiative. Minor magnetic storms caused by coronal holes (CHs) have also proven to be of high importance due to their long lasting and recurrent geomagnetic effects. In order to forecast CH related geomagnetic storms, the author developed an automated CH detection package (Coronal Hole Automated Recognition and Monitoring; CHARM) to replace the user-dependent CH boundary intensity thresholding methods used in previous studies. CHARM uses a local intensity thresholding method to identify low intensity regions in extreme ultraviolet or X-ray images. CHs are known to be regions of ?open? magnetic field and predominant polarity, which allowed the differentiation of CHs...
http://hdl.handle.net/2262/77037
Marcáilte
Marcáil
EG Andromedae : a symbiotic system as an insight into red giant chromospheres
(2012)
Roche, Joseph
EG Andromedae : a symbiotic system as an insight into red giant chromospheres
(2012)
Roche, Joseph
Achomaireacht:
THESIS 10042
http://hdl.handle.net/2262/77071
Marcáilte
Marcáil
Plasma diagnostics and hydrodynamic evolution of solar flares
(2014)
Ryan, Daniel F.
Plasma diagnostics and hydrodynamic evolution of solar flares
(2014)
Ryan, Daniel F.
Achomaireacht:
THESIS 10797
http://hdl.handle.net/2262/77073
Marcáilte
Marcáil
Quantum theory of multimode exciton-polariton Bose-Einstein Condensation
(2013)
Racine, David
Quantum theory of multimode exciton-polariton Bose-Einstein Condensation
(2013)
Racine, David
Achomaireacht:
THESIS 10353
http://hdl.handle.net/2262/77067
Marcáilte
Marcáil
EUV and X-ray spectroscopy of the active sun
(2010)
Raftery, Claire L.
EUV and X-ray spectroscopy of the active sun
(2010)
Raftery, Claire L.
Achomaireacht:
THESIS 9325
This thesis strives to improve our understanding of solar activity, specifically the behaviour of solar flares and coronal mass ejections. An investigation into the hydrodynamic evolution of a confined solar are was carried out using RHESSI, CDS, GOES and TRACE. Evidence for pre-are heating, explosive and gentle chromospheric evaporation and loop draining were observed in the data. The observations were compared to a 0-D hydrodynamic model, EBTEL, to aid interpretation. This led to the conclusion that the flare was not heated purely by non-thermal beam heating as previously believed, but also required direct heating of the plasma. An observational investigation in to the initiation mechanism of a coronal mass ejection and eruptive are was then carried out, again utilising observations from a wide range of spacecraft: MESSENGER/SAX, RHESSI, EUVI, Cor1 and Cor2. Observations provided evidence of CME triggering by internal tether-cutting and not by breakout reconnection...
http://hdl.handle.net/2262/77068
Marcáilte
Marcáil
Radio interferometric studies of cool evolved stellar winds
(2013)
O'Gorman, Eamon
Radio interferometric studies of cool evolved stellar winds
(2013)
O'Gorman, Eamon
Achomaireacht:
THESIS 10360
http://hdl.handle.net/2262/77059
Marcáilte
Marcáil
Liquid phase exfoliation of two dimensional crystals
(2013)
O'Neill, Arlene
Liquid phase exfoliation of two dimensional crystals
(2013)
O'Neill, Arlene
Achomaireacht:
THESIS 10145
http://hdl.handle.net/2262/77060
Marcáilte
Marcáil
Linear and nonlinear optical characterisation of self assembled nanostructures
(2012)
Persechini, Lina
Linear and nonlinear optical characterisation of self assembled nanostructures
(2012)
Persechini, Lina
Achomaireacht:
THESIS 9862
http://hdl.handle.net/2262/77064
Marcáilte
Marcáil
X-ray and radio diagnostics of accelerated electrons in solar active regions
(2015)
O'Flannagain, Aidan
X-ray and radio diagnostics of accelerated electrons in solar active regions
(2015)
O'Flannagain, Aidan
Achomaireacht:
THESIS 10593
http://hdl.handle.net/2262/77058
Marcáilte
Marcáil
Optical properties of capped metallic nanostructures, grown on silicon
(2011)
McAlinden, Niall
Optical properties of capped metallic nanostructures, grown on silicon
(2011)
McAlinden, Niall
Achomaireacht:
THESIS 9111
http://hdl.handle.net/2262/77047
Marcáilte
Marcáil
Fields and flares : understanding the complex magnetic topologies of solar active regions
(2013)
Murray, Sophie A.
Fields and flares : understanding the complex magnetic topologies of solar active regions
(2013)
Murray, Sophie A.
Achomaireacht:
THESIS 9979
Sunspots are regions of decreased brightness on the visible surface of the Sun (photosphere) that are associated with strong magnetic fields. They have been found to be locations associated with solar flares, which occur when energy stored in sunspot magnetic fields is suddenly released. The processes involved in flaring and the link between sunspot magnetic fields and flares is still not fully understood, and this thesis aims to gain a better understanding of these topics. The magnetic field evolution of a number of sunspot regions is examined using high spatial resolution data from the Hinode spacecraft. Photospheric magnetic field data is first investigated, and significant increases in negative vertical field strength, negative vertical current density, and field inclination angle towards the vertical are observed just hours before a flare occurs, which is on much shorter timescales than previously studied. These parameters then return to their pre-are ?quiet? st...
http://hdl.handle.net/2262/77055
Marcáilte
Marcáil
Fields, fractals and flares: characterising magnetic complexity in solar active regions
(2009)
Conlon, Paul A.
Fields, fractals and flares: characterising magnetic complexity in solar active regions
(2009)
Conlon, Paul A.
Achomaireacht:
THESIS 9195
The main drivers of space weather, solar flares and coronal mass ejections, are thought to originate from active regions on the surface of the Sun. The mechanisms by which active regions produce these eruptive events remains unclear. In this thesis, numerous mathematical methods are developed to characterise the complexity of active region magnetic fields on the Sun. In the first section of the thesis, a box-counting method was used to measure the temporal evolution of the multifractal parameters of a sample of active regions. These results are compared to other multi-scale methods and changes in the temporal evolution of the multifractal spectrum are found to be associated with a regions flaring potential. As an expansion of the box-counting method, a wavelet-based multifractal method, the wavelet transform modulus methods (WTMM), was similarly used to characterise the changing properties of active region magnetic fields. A study of the multifractal properties of ac...
http://hdl.handle.net/2262/77017
Marcáilte
Marcáil
d? magnetism in oxides and alkaline-earth hexaborides
(2014)
Ackland, Karl
d? magnetism in oxides and alkaline-earth hexaborides
(2014)
Ackland, Karl
Achomaireacht:
THESIS 10700
http://hdl.handle.net/2262/77009
Marcáilte
Marcáil
Design of optical system for heat-assisted magnetic recording
(2012)
Ballantine, Kyle
Design of optical system for heat-assisted magnetic recording
(2012)
Ballantine, Kyle
Achomaireacht:
TX-1-998
http://hdl.handle.net/2262/77010
Marcáilte
Marcáil
Red giant mass-loss : studying evolved stellar winds with FUSE and HST / STIS
(2006)
Crowley, Cian
Red giant mass-loss : studying evolved stellar winds with FUSE and HST / STIS
(2006)
Crowley, Cian
Achomaireacht:
THESIS 7951
The changes that a star undergoes during the dying process are the most dramatic of its lifetime. These changes result in the most important interactions between a star and its environment, indeed it is in this area of research that some of the most challenging astrophysical problems still remain. For most stars, mass-loss becomes significant when they approach the end of their lives and enter the red giant evolutionary phase. This mass is lost in the form of a relatively dense and slow-moving wind which enriches the interstellar medium with material that has been processed inside the star and which is required for the formation of new stars and planets. However, despite the importance and ubiquity of these winds much remains unknown about the outflow conditions and characteristics and, furthermore, the physical processes which drive the mass-loss are unknown. Indeed, the mass-loss question remains arguably the most important outstanding problem of stellar astrophysi...
http://hdl.handle.net/2262/77020
Marcáilte
Marcáil
Sunspot group evolution and the global magnetic field of the Sun
(2012)
Higgins, Paul A.
Sunspot group evolution and the global magnetic field of the Sun
(2012)
Higgins, Paul A.
Achomaireacht:
THESIS 10371
http://hdl.handle.net/2262/77030
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