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Displaying Results 51 - 75 of 10754 on page 3 of 431
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1 Card 6 Libraries Presentation
(2013)
Ward, Jamie; Branigan, Amanda
1 Card 6 Libraries Presentation
(2013)
Ward, Jamie; Branigan, Amanda
Abstract:
A presentation to the LIR Annual Seminar on the DkIT Library / Louth County Libraries initiative to allow joint membership of all County Louth libraries. This is the first joint venture of its kind in Ireland and this presentation gives a detailed description of the processes and policies needed to accomplish the joint membership arrangement.
http://eprints.dkit.ie/313/
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1 Gbit/s Radio Over Fiber Downlink at a 32 GHz Carrier
(2008)
Junker, Marcus; Schneider, Thomas; Lauterbach, Kai-Uwe; Henker, Ronny; Ammann, Max; Sch...
1 Gbit/s Radio Over Fiber Downlink at a 32 GHz Carrier
(2008)
Junker, Marcus; Schneider, Thomas; Lauterbach, Kai-Uwe; Henker, Ronny; Ammann, Max; Schwarzbacher, Andreas
Abstract:
<p>The carrier frequency of the presented radio over fiber downlink at 32 GHz is generated by stimulated Brillouin scattering and an error free 1 Gbit/s data transmission is realized.</p>
http://arrow.dit.ie/engschececon/34
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10 GHz, Class-B, 0.5 V, 130 nm CMOS Cross-Coupled Oscillator Design Using Open-Loop Technique
(2012)
Szczepkowski, Grzegorz ; Farrell, Ronan
10 GHz, Class-B, 0.5 V, 130 nm CMOS Cross-Coupled Oscillator Design Using Open-Loop Technique
(2012)
Szczepkowski, Grzegorz ; Farrell, Ronan
Abstract:
The paper presents a method for design of LC cross-coupled oscillators based on open-loop technique and its practical application leading to a high frequency CMOS oscillator prototype. Thanks to the proposed approach, main circuit parameters as loaded quality factor (responsible for phase noise performance of LC oscillator) and steady-state oscillation amplitude can be extracted, without the necessity of time consuming transient simulations. The presented method is not technology specific and allows fast calculations under changing bias conditions. The proposed 130 nm CMOS prototype operates 10 GHz from 0.5 V power supply achieving SSB phase noise of -113 dBc/Hz at 1 MHz offset from the carrier. Low power consumption of 1.09 mW RMS, has been obtained by biasing the oscillator devices to operate in class-B i.e. VGS =Vth.
http://eprints.maynoothuniversity.ie/3959/
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10Gbit/s modulation of a fast switching slotted Fabry-Pérot tunable laser
(2007)
Smyth, Frank; O'Dowd, John; Kilper, Daniel C.; Simsarian, J.E.; Barry, Liam P.; Ro...
10Gbit/s modulation of a fast switching slotted Fabry-Pérot tunable laser
(2007)
Smyth, Frank; O'Dowd, John; Kilper, Daniel C.; Simsarian, J.E.; Barry, Liam P.; Roycroft, Brendan; Corbett, Brian
Abstract:
The device used is a three-section, 3mum wide ridge waveguide laser based on commercially available material. During the fabrication a series of slots are introduced into the front and back sections, which act as sites of internal reflections. The slots are etched to a depth that just penetrates the top of the upper waveguide resulting in an internal reflectance of-1% at each slot. The front, middle, and back sections are 180, 690 and 170 microns long respectively. In this work the back and middle sections are tied together electrically allowing simpler control of the device. By varying the applied DC currents, eight discrete channels are observed over a range of approximately 19nm.
http://doras.dcu.ie/2308/
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10th Annual Scientific Conference Faculty of Sports and Exercise Medicine
(2013)
10th Annual Scientific Conference Faculty of Sports and Exercise Medicine
(2013)
http://hdl.handle.net/2262/80165
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Synchronization of user-generated videos through trajectory correspondence and a refinement procedure
(2013)
KOKARAM, ANIL
Synchronization of user-generated videos through trajectory correspondence and a refinement procedure
(2013)
KOKARAM, ANIL
http://hdl.handle.net/2262/73202
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A Framework for the Decentralisation and Management of Collaborative Applications in Ubiquitous Computing Environments
(2006)
FEENEY, KEVIN; LEWIS, DAVID; O'SULLIVAN, DECLAN; QUINN, KARL ANDREW; WADE, VINCENT...
A Framework for the Decentralisation and Management of Collaborative Applications in Ubiquitous Computing Environments
(2006)
FEENEY, KEVIN; LEWIS, DAVID; O'SULLIVAN, DECLAN; QUINN, KARL ANDREW; WADE, VINCENT PATRICK
http://hdl.handle.net/2262/27020
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Finite State Temporality and Context-Free Languages
(2013)
VOGEL, CARL
Finite State Temporality and Context-Free Languages
(2013)
VOGEL, CARL
Abstract:
In the finite-state temporality approach, events in natural language semantics have been characterized in regular languages, with strings representing sequences of temporal observations. We extend this approach to natural language constructions which are not regular. Context-free constructions are detailed and discussed. Superposition, the key operator in the finite-state temporality approach is investigated for context-free languages. The set of context-free languages is found to not be closed under superposition. However, as with intersection, the superposition of a context-free language and a regular language results in a context-free language. Previous work on subsumption and entailment is inapplicable to context-free languages, due to the undecidability of the subset relation for context-free languages.
http://hdl.handle.net/2262/67360
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11th Annual Scientific Conference of Faculty of Sports and Exercise Medicine & World Federation of Athletic Training and Therapy World Congress
(2014)
MAHONY, NICHOLAS
11th Annual Scientific Conference of Faculty of Sports and Exercise Medicine & World Federation of Athletic Training and Therapy World Congress
(2014)
MAHONY, NICHOLAS
http://hdl.handle.net/2262/80166
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12 (not so) easy pieces: grand challenges for open source software
(2006)
Feller, Joseph; Finnegan, Patrick; Lundell, Bjorn; Ostling, Mats; Agerfalk, Par J.; Dev...
12 (not so) easy pieces: grand challenges for open source software
(2006)
Feller, Joseph; Finnegan, Patrick; Lundell, Bjorn; Ostling, Mats; Agerfalk, Par J.; Deverell, Andrea
http://hdl.handle.net/10344/1857
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12 MHz to 5800 MHz Fully Integrated, Dual Path Tuned, Low Jitter, LC-PLL Frequency Synthesizer
(2012)
Keady, Aidan; Szczepkowski, Grzegorz ; Farrell, Ronan
12 MHz to 5800 MHz Fully Integrated, Dual Path Tuned, Low Jitter, LC-PLL Frequency Synthesizer
(2012)
Keady, Aidan; Szczepkowski, Grzegorz ; Farrell, Ronan
Abstract:
This paper presents a realised prototype of fully integrated CMOS LC-PLL frequency syn- thesizer. The circuit delivers a wide range of clock signals between 12 MHz and 5800 MHz, with average long term jitter of only 4 ps. The primary application of the presented circuit includes high speed series data transmission links. Low power consumption of the complete synthesizer (including bias circuitry), in the range of 50mW from dual 1.2 V/3.3 V supply, is in line with energy efficient solutions for modern elec- tronic systems. The circuit is developed using a standard RF UMC 130 nm CMOS process reducing design time and necessity for customisation of its components. Full integration of RC loop filter is obtained us- ing dual path tuning scheme, involving two separate charge pumps, two filter paths and specially modified LC-VCO architecture. Total synthesizer area including PLL circuitry with set of programmable frequency divider, output RF drivers, two separate VCO circuits and all auxili...
http://eprints.maynoothuniversity.ie/3956/
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Dynamic Contextual Usage Metadata for Learning Resource Reuse in Adaptive Environments
(2011)
WADE, VINCENT PATRICK; WALSH, EDDIE; CONLAN, OWEN; RAFTER, RACHAEL
Dynamic Contextual Usage Metadata for Learning Resource Reuse in Adaptive Environments
(2011)
WADE, VINCENT PATRICK; WALSH, EDDIE; CONLAN, OWEN; RAFTER, RACHAEL
Abstract:
Drawing on the experiences and context of others who have already used a particular resource can greatly facili- tate that resource?s reuse. Such reuse is essential when the resources in question are digital learning assets, services and models which are expensive both in terms of time and monetary expenditure to develop and use. When these re- sources are deployed in personalised settings, where each user may be delivered a tailored sequence of resources that uniquely suits their particular needs, gathering and feder- ating a rich view of how these resources are being used be- comes important. In this article we describe an approach to facilitating the federating of contextual usage data, which is compiled over the lifecycle of a resource. Given that this data is likely to come from a range of different sources, our approach will need to be able to cope with the high level of heterogeneity expected in terms of its structure, syntax and semantics. We describe how such data may be us...
http://hdl.handle.net/2262/65743
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Extending a Knowledge-based Network to support Temporal Event Reasoning
(2010)
O'SULLIVAN, DECLAN; KEENEY, JOHN
Extending a Knowledge-based Network to support Temporal Event Reasoning
(2010)
O'SULLIVAN, DECLAN; KEENEY, JOHN
Abstract:
While the polling or request/response paradigm adopted by many network and systems management approaches form the backbone of modern monitoring and management systems, the most important and interesting events, faults, alerts and log messages arrive at the management agent in a push-based asynchronous manner. However, in the management infrastructure itself, at the point where events are initially processed and matched to subscribers, there have been few attempts to identify relationships or dependencies between events. This means that most of this burden is placed on the management application, or indeed the managers themselves. This research investigates enhancing the expressiveness of a knowledge-based networking middleware with the addition of three temporal operators to be used in subscriptions to select matching events. A prototype design is presented and a number of implementations are compared. The approach is also motivated using two scenarios for temporal correlation of wa...
http://hdl.handle.net/2262/49401
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Influence of intra-ensemble energy transfer on the properties of nanocrystal quantum dot structures and devices
(2010)
BRADLEY, LOUISE; GOUNKO, IOURI; GERARD, VALERIE; LUNZ, MANUELA
Influence of intra-ensemble energy transfer on the properties of nanocrystal quantum dot structures and devices
(2010)
BRADLEY, LOUISE; GOUNKO, IOURI; GERARD, VALERIE; LUNZ, MANUELA
Abstract:
The impact of intra-ensemble Forster resonant energy transfer (FRET) on the optical properties of monodispersed quantum dot (QD) monolayers and a donor/acceptor FRET bilayer structure are presented. The QD structures are characterized by steady-state absorption and photoluminescence (PL) spectroscopy as well as time-resolved PL measurements. The optical properties of the monodispersed monolayers, such as peak emission wavelength and PL decays, are strongly influenced by FRET from smaller to larger QDs within the ensemble. Comparing several QD samples, the spectral overlap of the QD ensemble and the QD concentration were identified as parameters that allow for tuning of FRET in monodispersed QD structures. For the donor/acceptor QD bilayer structure an unexpected decrease of the FRET efficiency between donor and acceptor layers is observed with increasing donor QD concentration. The concentration-dependent donor lifetime and a constant donor-acceptor FRET rate can explain this decrea...
http://hdl.handle.net/2262/49304
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Influence of localised surface plasmons on energy transfer between quantum dots
(2010)
BRADLEY, LOUISE; LUNZ, MANUELA; GERARD, VALERIE; GOUNKO, IOURI
Influence of localised surface plasmons on energy transfer between quantum dots
(2010)
BRADLEY, LOUISE; LUNZ, MANUELA; GERARD, VALERIE; GOUNKO, IOURI
Abstract:
The effects of surface plasmons (SPs) on Forster resonant energy transfer (FRET) in colloidal quantum dot (QD) structures have been investigated. CdTe QDs of two different sizes acted as donors and acceptors in a mixed donor-acceptor monolayer on top of a gold nanoparticle layer and an acceptor-gold-donor sandwich structure. The structures were prepared by a layer-by-layer technique and characterized by absorption and photoluminescence (PL) spectroscopy as well as time-resolved PL measurements. For the case of the mixed QD monolayer a recovery of the acceptor emission is observed when increasing the acceptor-gold separation. The reduction of the donor lifetime indicates that the FRET process is enhanced by 30%. In the sandwich structure a clear modification of the FRET distance dependence towards a typical SP influenced dependence on the QD-gold separation is observed. The maximum acceptor QD emission occurs at approximately 12 nm from the intermediate gold layer, corresponding to a...
http://hdl.handle.net/2262/49307
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13th Annual Scientific Conference Faculty of Sports and Exercise Medicine
(2016)
13th Annual Scientific Conference Faculty of Sports and Exercise Medicine
(2016)
http://hdl.handle.net/2262/80168
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Investigating fine temporal dynamics of prosodic and lexical accommodation
(2013)
DE LOOZE, CELINE; CAMPBELL, NICK; BONIN, FRANCESCA; VOGEL, CARL
Investigating fine temporal dynamics of prosodic and lexical accommodation
(2013)
DE LOOZE, CELINE; CAMPBELL, NICK; BONIN, FRANCESCA; VOGEL, CARL
Abstract:
Conversational interaction is a dynamic activity in which participants engage in the construction of meaning and in establishing and maintaining social relationships. Lexical and prosodic accommodation have been observed in many studies as contributing importantly to these dimensions of social interaction. However, while previous works have considered accommodation mechanisms at global levels (for whole conversations, halves and thirds of conversations), this work investigates their evolution through repeated analysis at time intervals of increasing granularity to analyze the dynamics of alignment in a spoken language corpus. Results show that the levels of both prosodic and lexical accommodation fluctuate several times over the course of a conversation.
http://hdl.handle.net/2262/67397
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Winds of Planet Hosting Stars
(2015)
VIDOTTO, ALINE
Winds of Planet Hosting Stars
(2015)
VIDOTTO, ALINE
Abstract:
The field of exoplanetary science is one of the most rapidly growing areas of astrophysical research. As more planets are discovered around other stars, new techniques have been developed that have allowed astronomers to begin to characterise them. Two of the most important factors in understanding the evolution of these planets, and potentially determining whether they are habitable, are the behaviour of the winds of the host star and the way in which they interact with the planet. The purpose of this project is to reconstruct the magnetic fields of planet hosting stars from spectropolarimetric observations, and to use these magnetic field maps to inform simulations of the stellar winds in those systems using the Block Adaptive Tree Solar-wind Roe Upwind Scheme ( BATS - R - US ) code. The BATS - R - US code was originally written to investigate the behaviour of the Solar wind, and so has been altered to be used in the context...
http://hdl.handle.net/2262/79170
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Improving the measurement accuracy of PIV in a synthetic jet flow
(2008)
PERSOONS, TIM; MURRAY, DARINA
Improving the measurement accuracy of PIV in a synthetic jet flow
(2008)
PERSOONS, TIM; MURRAY, DARINA
http://hdl.handle.net/2262/79689
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Large Energy Transfer Distance to a plane of Gold Nanoparticles
(2012)
BRADLEY, LOUISE; GOUNKO, IOURI
Large Energy Transfer Distance to a plane of Gold Nanoparticles
(2012)
BRADLEY, LOUISE; GOUNKO, IOURI
Abstract:
The quenching of emission in proximity to metallic surfaces via non-radiative energy transfer is studied for sensing applications. It can also be used for the measurement of distances on the nanoscale. We report on energy transfer from a plane of CdTe quantum dots (QDs) plane to a plane of gold (Au) nanoparticles. Both photoluminescence (PL) and luminescence lifetime measurements demonstrate that energy transfer efficiency not only depends on plane separation but also Au nanoparticle concentration. Energy transfer to the plane of metal nanoparticles can be considered within the standard Fo?rster resonant energy transfer (FRET) model or the nano-metal surface energy transfer (NSET) model. It is found that both dependences are well described within the model of FRET which shows a 1/d4 distance dependence and a 1/CAu Au concentration dependence. However, surprisingly large Fo?rster radii of 10 nm, larger than expected from the spectral overlap of the QD emission and gold localised surf...
http://hdl.handle.net/2262/70453
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Decay Rates near layers of Au Nanospheres
(2012)
BRADLEY, LOUISE
Decay Rates near layers of Au Nanospheres
(2012)
BRADLEY, LOUISE
Abstract:
The decay rate of quantum emitters near a layer of Au nanospheres is studied in the framework of a Green?s tensor formalism. The localized surface plasmons that can be excited on the gold spheres provide a strong avenue for transporting the energy from the donors to the acceptors. The effect of the layer when compared to a single sphere depends on the concentration and distance in a non-trivial way, having a maximum at a finite distance.
http://hdl.handle.net/2262/70451
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Noise Source Location in Turbomachinery Using Coherence Based Modal Decomposition (AIAA 2009-3367)
(2009)
BENNETT, GARETH; FITZPATRICK, JOHN
Noise Source Location in Turbomachinery Using Coherence Based Modal Decomposition (AIAA 2009-3367)
(2009)
BENNETT, GARETH; FITZPATRICK, JOHN
Abstract:
Coherence based source analysis techniques can be used to identify the contribution of turbomachinery core noise sources to pressure measurements in the far-field. The usual approach is to locate a measurement sensor within the engine and to calculate the ordinary coherence function between this and the far-field pressure measurement. If the internal measurement is close to a dominant noise source, the technique will identify this sources? contribution to the overall far-field energy. Modal decomposition is an advanced technique which can provide detailed information as to the modal content of sound propagating in ducts. When applied to aero-engines, the technique can be used as a diagnostic to determine which of the many rotor-stator stages contribute most to the overall radiated sound power. The method developed in this paper discusses how the two techniques can be combined to locate the plane at which a mode is generated within an aeroengine. A proof of concept of the technique i...
http://hdl.handle.net/2262/36149
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Implicit spatial inference with sparse local features
(2008)
KOKARAM, ANIL CHRISTOPHER; O'REGAN, DEIRDRE
Implicit spatial inference with sparse local features
(2008)
KOKARAM, ANIL CHRISTOPHER; O'REGAN, DEIRDRE
http://hdl.handle.net/2262/27639
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Feature-based object modelling for visual surveillance
(2008)
BAUGH, GARY; KOKARAM, ANIL CHRISTOPHER
Feature-based object modelling for visual surveillance
(2008)
BAUGH, GARY; KOKARAM, ANIL CHRISTOPHER
http://hdl.handle.net/2262/27640
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Multilingual Adaptive Search for Digital Libraries
(2011)
LAWLESS, SEAMUS; GHORAB, MOHAMMED RAMI ELHUSSEIN; O'CONNOR, ALEXANDER; ZHOU, DONG;...
Multilingual Adaptive Search for Digital Libraries
(2011)
LAWLESS, SEAMUS; GHORAB, MOHAMMED RAMI ELHUSSEIN; O'CONNOR, ALEXANDER; ZHOU, DONG; WADE, VINCENT
Abstract:
We describe a framework for Adaptive Multilingual Information Retrieval (AMIR) which allows multilingual resource discovery and delivery using on-the-fly machine translation of documents and queries. Result documents are presented to the user in a contextualised manner. Challenges and affordances of both adaptive and multilingual IR, with a particular focus on digital libraries, are detailed. The framework components are motivated by a series of results from experiments on query logs and documents from The European Library. We conclude that factoring adaptivity and multilinguality aspects into the search process can enhance the user?s experience with online digital libraries.
http://hdl.handle.net/2262/62481
Displaying Results 51 - 75 of 10754 on page 3 of 431
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All Ireland Public Health R... (18)
Connacht-Ulster Alliance (148)
Dublin City University (2460)
Dublin Institute of Technology (2296)
Dundalk Institute of Techno... (111)
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