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Displaying Results 10376 - 10400 of 10510 on page 416 of 421
Marked
Mark
Noise controlled semiconductor optical amplifiers
(2012)
Lennox, Robert
Noise controlled semiconductor optical amplifiers
(2012)
Lennox, Robert
Abstract:
THESIS 9813
Semiconductor optical amplifiers (SOA) have been widely used in communications systems for decades, in a multitude of capacities. In their simplest form SOAs offer cost effective linear amplification at a variety of wavelengths, simultaneously covering a large gain bandwidth, with the added benefit of practical photonic integration. They are electrically pumped and have good thermal stability, all packaged within a very small volume. In addition to this, SOAs can be operated as non-linear entities under saturation, with the capability to perform alloptical functional duties over a range of configurations and data rates far beyond the realm of commercial high-speed electronics currently used for signal processing. These latter attributes are becoming ever more important as our appetite for digital information drives bandwidth consumption to greater heights.
http://hdl.handle.net/2262/90300
Marked
Mark
Charging, doping and gating of a single dangling bond on a bare Si(100)-c(4x2) surface
(2012)
Mantega, Mauro
Charging, doping and gating of a single dangling bond on a bare Si(100)-c(4x2) surface
(2012)
Mantega, Mauro
Abstract:
THESIS 9916
Despite the increasing interest in novel materials for the next generation of microelectronic devices, such as graphene and topological insulators, Si(100) surface is still the most important substrate for nano-device applications. Its high stability and the possibility of manipulating and functionalizing the surface properties at an atomic level are opening up new perspectives for a wide range of applications ranging from transistor downscaling, dictated by Moore's law, to quantum computing.
http://hdl.handle.net/2262/90324
Marked
Mark
Thermal performance and fitness of glacial till for Rammed Earth construction
(2019)
Pavia, Sara; Tinsley, Jack
Thermal performance and fitness of glacial till for Rammed Earth construction
(2019)
Pavia, Sara; Tinsley, Jack
Abstract:
The search for sustainability caused a revival of earth construction. Rammed earth (RE) construction is often preferred as compaction and stabilization leads to stronger, more consistent materials. Tills are glacial sediments. Historically, they were used for construction and brick making. However, their heterogeneous nature has prevented standardisation into mainstream construction. This work contributes to make earth a reliable building material. It evaluates the suitability of till for RE construction by measuring its geotechnical parameters and comparing them against recommended RE values. The results are consistent with other tills and indicate fitness for RE construction. The tills were successfully stabilized with 5% lime, reaching compressive strengths c.1.09?MPa. Thermal performance is vital in construction. High thermal mass materials such as RE can lower today's unsustainable energy demand for heating and cooling. This work experimentally measures the thermal proper...
http://hdl.handle.net/2262/90268
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Mark
Studies on the use of anhydrides in novel catalytic asymmetric transformations
(2013)
Manoni, Francesco
Studies on the use of anhydrides in novel catalytic asymmetric transformations
(2013)
Manoni, Francesco
Abstract:
THESIS 10205
In this thesis the possibility of using bifunctional cinchona alkaloid-derived organocatalysts to promote the enantioselective cycloaddition reaction of enolisable anhydrides to various electrophiles to form annulated structures with high stereocontrol has been demonstrated.
http://hdl.handle.net/2262/90323
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Mark
Evaluating UK natural hazards: the national risk assessment
(2019)
Stock, Michael; Wentworth, Jonathan
Evaluating UK natural hazards: the national risk assessment
(2019)
Stock, Michael; Wentworth, Jonathan
Abstract:
Despite its relatively temperate climate and stable geography, natural hazards present multiple risks to human activity in the UK. These range from small-scale local occurrences, such as landslides, through regional incidents, such as flooding, to major high impact, low probability events, such as space weather. The impacts of such hazards can be wide-ranging but may include disruption to critical infrastructure and transport networks, detrimental effects on human welfare, and, in some cases, loss of life. This POSTbrief summarises the emergency planning for such hazards undertaken by Civil Contingencies Secretariat (CCS) of the Cabinet Office and published in the classified National Risk Assessment (NRA) and unclassified National Risk Register (NRR).
http://hdl.handle.net/2262/90264
Marked
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A comparative study of multi-objective machine reassignment algorithms for data centres
(2019)
Saber, Takfarinas; Gandibleux, Xavier; O'Neill, Michael; Murphy, Liam, B.E.; Ventr...
A comparative study of multi-objective machine reassignment algorithms for data centres
(2019)
Saber, Takfarinas; Gandibleux, Xavier; O'Neill, Michael; Murphy, Liam, B.E.; Ventresque, Anthony
Abstract:
At a high level, data centres are large IT facilities hosting physical machines (servers) that often run a large number of virtual machines (VMs)— but at a lower level, data centres are an intricate collection of interconnected and virtualised computers, connected services, complex service-level agreements. While data centre managers know that reassigning VMs to the servers that would best serve them and also minimise some cost for the company can potentially save a lot of money—the search space is large and constrained, and the decision complicated as they involve different dimensions. This paper consists of a comparative study of heuristics and exact algorithms for the Multi-objective Machine Reassignment problem. Given the common intuition that the problem is too complicated for exact resolutions, all previous works have focused on various (meta)heuristics such as First-Fit, GRASP, NSGA-II or PLS. In this paper, we show that the state-of-art solution to the single objective formu...
http://hdl.handle.net/10197/11192
Marked
Mark
Subjective and objective quality assessment for volumetric video compression
(2019)
Smolic, Aljosa; Gao, Pan; Zerman, Emin; Oczinar, Cagri
Subjective and objective quality assessment for volumetric video compression
(2019)
Smolic, Aljosa; Gao, Pan; Zerman, Emin; Oczinar, Cagri
Abstract:
Volumetric video is becoming easier to capture and display with the recent technical developments in the acquisition, and display technologies. Using point clouds is a popular way to represent volumetric video for augmented or virtual reality applications. This representation, however, requires a large number of points to achieve a high quality of experience and needs compression before storage and transmission. In this paper, we study the subjective and objective quality assessment results for volumetric video compression, using a state-of-the-art compression algorithm: MPEG Point Cloud Compression Test Model Category 2 (TMC2). We conduct subjective experiments to find the perceptual impacts on compressed volumetric video with different quantization parameters and point counts. Additionally, we find the relationship between the state-of-the-art objective quality metrics and the acquired subjective quality assessment results. To the best of our knowledge, this study is the first to ...
http://hdl.handle.net/2262/90359
Marked
Mark
Spatially explicit economic and environmental optimisation of bio-SNG production systems integration with the Irish gas network
(2019)
Singlitico, Alessandro
Spatially explicit economic and environmental optimisation of bio-SNG production systems integration with the Irish gas network
(2019)
Singlitico, Alessandro
Abstract:
Biomass-derived synthetic natural gas (bio-SNG), produced from biomass through gasification and cleaning and conditioning of syngas, is an energy carrier compatible with the existing gas infrastructure and appliances, is a promising solution for the decarbonisation of transport, heating and electricity generation. However, low energy density and scattered distribution of the resources, technological complexity and high cost of the conversion process, undermine its sustainability. This thesis aimed to deliver a techno-economic and environmental assessment of bio-SNG production, and to build a model that allows identification of the sites and the sizes of the plants for bio-SNG production that minimises the cost and the environmental impact of the bio-SNG produced in the case of the Republic of Ireland. Published life cycle assessments (LCAs) of bio-SNG and biomethane have been reviewed. None of the studies integrated their LCA with both process and geospatial modelling. Therefore a f...
http://hdl.handle.net/10379/15554
Marked
Mark
Learning how: body techniques, skill acquisition and the consumption of experience
(2018)
Murphy, Stephen; Patterson, Maurice; O'Malley, Lisa
Learning how: body techniques, skill acquisition and the consumption of experience
(2018)
Murphy, Stephen; Patterson, Maurice; O'Malley, Lisa
Abstract:
Although the skilful body has been ever-present in research accounts of consumption experiences, no sustained attention has been given to the acquisition of skills necessary for successful engagement with those experiences. In the present study, we report an empirical investigation of the acquisition and diffusion of embodied competencies among high-speed motorcyclists. In doing so, we mobilize the concept of reflexive body techniques in order to unpack the social, physical and mindful aspects of skilled embodiment. We demonstrate that skill acquisition is a necessary pre- cursor to successful immersion into certain kinds of consumption experiences offered by the marketplace. Further, we underline the role of skill acquisition in subject formation.
peer-reviewed
http://hdl.handle.net/10344/8224
Marked
Mark
Benchmark selectivity p-xylene separation by a non-porous molecular solid through liquid or vapor extractionâ€
(2019)
Sun, Na; Wang, Shi-Qiang; Zou, Ruqiang; Cui, Wen-Gang; Zhang, Anqi; Zhang, Tianzhen; Li...
Benchmark selectivity p-xylene separation by a non-porous molecular solid through liquid or vapor extractionâ€
(2019)
Sun, Na; Wang, Shi-Qiang; Zou, Ruqiang; Cui, Wen-Gang; Zhang, Anqi; Zhang, Tianzhen; Li, Qi; Zhuang, Zhan-Zhong; Zhang, Ying-Hui; Xu, Jialiang; Zaworotko, Michael J.; Bu, Xian-He
Abstract:
Solid–liquid separation of similarly sized organic molecules utilizing sorbents offers the potential for new energy-efficient approaches to a number of important industrial separations such as xylenes (C8) separations. Research on selective C8 sorption has tended to focus upon rigid porous materials such as zeolites and MOFs but has revealed generally weak selectivity that is inconsistent across the range of C8 molecules. Nevertheless, there are a few recent examples of non-porous molecular materials that exhibit relatively high selectivity for p-xylene (pX) from pX/oX, approaching that of the current benchmark pX sorbent, the zeolite H/ZSM-5. Herein, we report that a L-shaped Ag(I) complex, AgLClO4 (M), which crystallizes as a non-porous molecular solid material, offering exceptional performance for pX selectivity across the range of C8 isomers with liquid extraction selectivity values of 24.0, 10.4 and 6.2 vs. oX, eB and mX, respectively. The pX selectivities over oX and eB are am...
http://hdl.handle.net/10344/8226
Marked
Mark
An analysis of people’s behaviours and attitudes to food consumption and waste in the Cork region
(2017)
Sweeney, Michelle
An analysis of people’s behaviours and attitudes to food consumption and waste in the Cork region
(2017)
Sweeney, Michelle
Abstract:
There is now more than ever before an emphasis on the amount of food we eat as consumers and the amount of food that is wasted in the process. This is an emerging and important topic in food business and development and therefore the topic meets the criteria for research. The covered topics in this research include what food waste is, why we need to reduce food waste, the main trends that influence food waste and effects food waste has on the environment. It will also cover the development of food waste policies in other countries, the results of research carried out and conclusions and recommendations. These areas give an overview of people’s behaviours and attitudes to food waste and consumption.
http://hdl.handle.net/10468/9003
Marked
Mark
A categorisation framework for a feature-level analysis of social network sites
(2016)
O'Riordan, Sheila; Feller, Joseph; Nagle, Tadhg
A categorisation framework for a feature-level analysis of social network sites
(2016)
O'Riordan, Sheila; Feller, Joseph; Nagle, Tadhg
Abstract:
Social media (SM) have enabled new forms of communication, interaction, and connectivity that affect individuals on a personal and professional level. But SM is a broad term that encompasses a wide range of technologies with both distinct and shared capabilities. In addition, while there is an agreed-upon definition of these systems, a comprehensive list of features and their affordances does not exist. Hence, this study sought to create a feature-level categorisation framework for analysing the use of social network sites (SNS). This categorisation was undertaken using the concept of affordances, which framed the high-level characteristics as well as distinct SNS features, to better understand the divergence in SNS capabilities and inform the study of different types of SM. The framework was created from an analysis of the literature on SNS affordances and a system investigation into three types of SNS (Facebook, YouTube and Twitter). The comprehensive review was undertaken using t...
http://hdl.handle.net/10468/9010
Marked
Mark
Controlled electromigration on vicinal surfaces
(2012)
? Coile?in, Cormac
Controlled electromigration on vicinal surfaces
(2012)
? Coile?in, Cormac
Abstract:
THESIS 9576
The influence of an electric field on the dynamics of steps, on vicinal surfaces, during high temperature annealing was experimentally studied. An experimental setup was designed, constructed and employed to explicitly isolate, for the first time, the electromigration and thermal effects in the dynamics of the step-bunching process on the vicinal Si(111) surface. Unlike conventional experiments, the setup's configuration allowed combined but independent control direct-current joule-heating and irradiative heating of samples.
http://hdl.handle.net/2262/90460
Marked
Mark
Structural and functional studies of Pseudomonas aeruginosa strain PAOI Lysine Specific Permease (LysP)
(2013)
Nji, Emmanuel Doh
Structural and functional studies of Pseudomonas aeruginosa strain PAOI Lysine Specific Permease (LysP)
(2013)
Nji, Emmanuel Doh
Abstract:
THESIS 10154
The means by which substrates are shuttled across prokaryotic membranes by membrane transporters and the conformational changes involved are unique to each transporter. To decipher the underlying mechanism of substrate selectivity and the conformational changes required for transport, we sought to establish the high resolution crystal structure of a lysine specific transporter from Pseudomonas aeruginosa strain PAOl, hereafter referred to as LysP. Also, we aim to show that the protein binds and transports L-lysine.
http://hdl.handle.net/2262/90451
Marked
Mark
Dynamic Environment Mapping for Augmented Reality Applications on Mobile Devices
(2018)
Monroy, Rafael; Mudon, Matis; Smolic, Aljosa
Dynamic Environment Mapping for Augmented Reality Applications on Mobile Devices
(2018)
Monroy, Rafael; Mudon, Matis; Smolic, Aljosa
Abstract:
Augmented Reality is a topic of foremost interest nowadays. Its main goal is to seamlessly blend virtual content in real-world scenes. Due to the lack of computational power in mobile devices, rendering a virtual object with high-quality, coherent appearance and in real-time, remains an area of active research. In this work, we present a novel pipeline that allows for coupled environment acquisition and virtual object rendering on a mobile device equipped with a depth sensor. While keeping human interaction to a minimum, our system can scan a real scene and project it onto a two-dimensional environment map containing RGB+Depth data. Furthermore, we define a set of criteria that allows for an adaptive update of the environment map to account for dynamic changes in the scene. Then, under the assumption of diffuse surfaces and distant illumination, our method exploits an analytic expression for the irradiance in terms of spherical harmonic coefficients, which leads to a very efficient ...
http://hdl.handle.net/2262/90466
Marked
Mark
Isolation and characterisation of novel fungal root endophytes from Elymus repens (Poaceae) for resistance to Fusarium, Gaeummanomyces and Pyrenophora
(2019)
H?YER, ANNA KAJA
Isolation and characterisation of novel fungal root endophytes from Elymus repens (Poaceae) for resistance to Fusarium, Gaeummanomyces and Pyrenophora
(2019)
H?YER, ANNA KAJA
Abstract:
Barley diseases are predominantly controlled using genetic resistance and fungicides. However, pathogen populations are becoming increasingly tolerant to the active compounds in fungicides and the European Union is endorsing integrated pest management, including biocontrol, in order to promote sustainable agriculture. In this thesis the root endophyte community of Elymus repens was studied using direct amplicon sequencing as well as a culture dependent method combined with standard DNA barcoding. The aim was to identify how different the total fungal community, determined by amplicon sequencing, was between five sites, and also among individual plants, in order to investigate the importance of these factors in endophyte discovery. Direct amplicon sequencing revealed that the five sites had distinct fungal endophyte communities and on average a root system contained 151 OTUs. In addition, the individual plants showed a large variation in species richness ranging from 96 to 239 OTUs o...
http://hdl.handle.net/2262/90468
Marked
Mark
Developing trends in the Catholicity of judicial decisions on the Constitution
(2010)
? Drisceoil, Macdara
Developing trends in the Catholicity of judicial decisions on the Constitution
(2010)
? Drisceoil, Macdara
Abstract:
THESIS 9055
In this thesis I examine the development of Catholicity as an influence on judicial decisions on the Constitution. When I refer to Catholicity, it concerns Catholic thought, Catholic social teaching, clerical intervention in the legal process and evidence of judicial deference towards the Catholic hierarchy. I argue that there is less evidence of Catholicity in judicial decisions on the Constitution in the early years of the State than one would expect given the confessional culture that existed. I argue that the reason for this was the residual influence of the British liberal concept of parliamentary supremacy on the judiciary which meant that the Courts adopted an unassertive position and tended not to engage with the Catholic norms in the 1937 Constitution. An exception to this unassertiveness and unwillingness to engage with the Constitution was Gavan Duffy P whose judgments represent the high water mark of Catholicity at a time in which the Catholic Church'...
http://hdl.handle.net/2262/90461
Marked
Mark
The behavioural neurophysiology of stress : effects on hippocampal formation mechanisms of spatial representation
(2011)
Passecker, Johannes
The behavioural neurophysiology of stress : effects on hippocampal formation mechanisms of spatial representation
(2011)
Passecker, Johannes
Abstract:
THESIS 9164
In the fast-paced world we live in we encounter stressful situations on a continuous basis. Some stressors may cause chronic stress whereas others act only on a relatively short time basis and are regarded as acute stressors. Both forms of stress have a high impact on our daily life, well-being and our productivity. With this in mind, the following thesis attempts to shed more light on the behavioural and cellular changes caused by acute stress using electrophysiological, molecular, anatomical and behavioural investigations in the rat.
http://hdl.handle.net/2262/90522
Marked
Mark
The effect of audition on the deployment of visuo-spatial attention
(2011)
Rogers, Daniel Kenneth
The effect of audition on the deployment of visuo-spatial attention
(2011)
Rogers, Daniel Kenneth
Abstract:
THESIS 9161
Vision is commonly accepted as being our most dominant sense. However, our everyday experience informs us that the world is not unisensory. Information from other senses can help us in searching for and identifying objects in our environment. The perceptual processes underpinning visual search have been studied extensively. This thesis investigated specifically the role of audition in attentional deployment on visuo-spatial tasks. Much of the literature in this area is centred around the visual search paradigm and the studies often incorporate basic low-level stimuli. In the present experiments, we used search tasks that incorporated multisensory stimuli in high-level scenes. The primary aim of this thesis was to further our understanding of how sound affects our ability to detect objects in our environment.
http://hdl.handle.net/2262/90569
Marked
Mark
The contribution of cognitive control and perceptions of risk to problematic driving among young adults
(2013)
O'Brien, Fearghal
The contribution of cognitive control and perceptions of risk to problematic driving among young adults
(2013)
O'Brien, Fearghal
Abstract:
THESIS 9942
Every year, millions of drivers throughout the world lose their lives in traffic incidents and young drivers make up a disproportionate number of those killed on the road. There has been no shortage of explanations for these high rates though an increasingly popular explanation points to the underdeveloped brains of young people which lead them to engage in greater risks.
http://hdl.handle.net/2262/90475
Marked
Mark
Spectroscopic studies of self-assembled plasmonic nanoparticle arrays
(2011)
Verre, Ruggero
Spectroscopic studies of self-assembled plasmonic nanoparticle arrays
(2011)
Verre, Ruggero
Abstract:
THESIS 9509
In this thesis an alternative self-assembled deposition technique able to produce nanoparticle (NP) arrays ordered on the macroscale is described. Stepped surfaces are produced by high temperatures annealing AI3O4 (0001) and metals are evaporated at a glancing angle of incidence towards the surface. In this way NPs are produced on a transparent and insulating substrate. These structures show localised plasmon resonances whose energetic positions depend on the polarization of the exciting light, the template deposition, the NP size as well as the distance between the NPs.
http://hdl.handle.net/2262/90650
Marked
Mark
Electron paramagnetic resonance characterisation of defects in HfO2 and ZrO2 powders and films
(2009)
Wright, Sandra
Electron paramagnetic resonance characterisation of defects in HfO2 and ZrO2 powders and films
(2009)
Wright, Sandra
Abstract:
THESIS 8787
Electron Paramagnetic Resonance (EFR) measurements have been made on a variety of commercially available samples of monoclinic HfO2 and ZrO2 powders and also on HfO2 and ZrO2 films deposited on silicon by electron beam evaporation. The high dielectric constant of HfO2 and ZrO2 is one of the reasons that they are being considered as a replacement for SiO2 as a gate dielectric in Si CMOS devices. The aim of this study is to characterise the defects in HfO2 and ZrO2 , to determine if the defects trap charge and to determine if the defects will affect device performance. All EPR spectra were taken at a microwave frequency of about 9.5GHz and at room temperature.
http://hdl.handle.net/2262/90673
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Mark
Electronic transport on carbon nanotube networks : a multiscale computational approach
(2011)
Pereira, Luiz Felipe C.
Electronic transport on carbon nanotube networks : a multiscale computational approach
(2011)
Pereira, Luiz Felipe C.
Abstract:
THESIS 9123
Carbon is arguably the most versatile of chemical elements. For the last 25 years research on carbon nanostrutures has been one of the most active areas of science. Carbon-based nanoelectronics is the most promising alternative to replace the ageing silicon-based technologies. In particular, carbon nanotubes present remarkable physical properties such as very low electrical resistance and very high mechanical strength.
http://hdl.handle.net/2262/90527
Marked
Mark
Atomistic models and time-dependent simulations of spin dynamics in isolated and current-carrying systems
(2012)
Pertsova, Anna
Atomistic models and time-dependent simulations of spin dynamics in isolated and current-carrying systems
(2012)
Pertsova, Anna
Abstract:
THESIS 10028
Understanding and ultimately controlling the dynamics of electrons and their spins is an important aspect of spin-based electronics. Recent experimental advances open up new possibilities for probing spin dynamics with very high spatial and temporal resolution, i.e. in atomic-sized systems and at sub-picosecond time scales. At these lengths and times quantum effects and atomistic details can not be neglected and the applicability of classical models is limited. Therefore, there is a need to develop new methodologies and computational tools for atomistic modeling of spin dynamics, in particular in the presence of electric currents. In this Thesis we construct a computational scheme, capable of describing the time evolution of spin systems both in isolation and under current-carrying conditions. The method has been developed in the spirit of the tightbinding model but it is transferable to more accurate first-principles methods such as density functional theory. This ...
http://hdl.handle.net/2262/90530
Marked
Mark
Automated annotation of yeast genomes
(2012)
Proux, Estelle
Automated annotation of yeast genomes
(2012)
Proux, Estelle
Abstract:
THESIS 9716
I have built an automated annotation pipeline (named YGAP - Yeast Genome Annotation Pipeline), designed specifically for new yeast genome sequences lacking transcriptome data. YGAP uses homology and synteny information from other yeast species stored in the Yeast Gene Order Browser (YGOB) database to annotate yeast genomes using the outputs from high-throughput sequencing methods. The pipeline is able to detect probable frameshift sequencing errors and can propose corrections for them. YGAP searches intelligently for introns, and detects tRNA genes and Ty-like elements. Using YGAP, I have automatically reannotated the genomes of Saccharomyces cerevisiae and Naumovozyma castellii, and compared the annotation results to those obtained with another popular annotation pipeline, AUGUSTUS. For S. cerevisiae and N. castellii, 91-93% of YGAP's predicted gene structures were identical to those in previous manually curated gene sets, and it outperforms AUGUSTUS.
http://hdl.handle.net/2262/90548
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