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Displaying Results 1 - 25 of 739 on page 1 of 30
Marked
Mark
Columnar to Equiaxed Transition in Peritectic TiAl Based Alloy Studied by a Power-Down Technique
(2014)
MOONEY, ROBIN
Columnar to Equiaxed Transition in Peritectic TiAl Based Alloy Studied by a Power-Down Technique
(2014)
MOONEY, ROBIN
http://hdl.handle.net/2262/76206
Marked
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An investigation into Bridgman furnace solidification of titanium alloys
(2013)
MOONEY, ROBIN; MCFADDEN, SHAUN
An investigation into Bridgman furnace solidification of titanium alloys
(2013)
MOONEY, ROBIN; MCFADDEN, SHAUN
http://hdl.handle.net/2262/75677
Marked
Mark
7B7: a novel antibody directed against the Ku70/Ku80 heterodimer blocks invasion in pancreatic and lung cancer cells
(2014)
O'Sullivan, Dermot; Henry, Michael; Joyce, Helena; Walsh, Naomi; Mc Auley, Edel; D...
7B7: a novel antibody directed against the Ku70/Ku80 heterodimer blocks invasion in pancreatic and lung cancer cells
(2014)
O'Sullivan, Dermot; Henry, Michael; Joyce, Helena; Walsh, Naomi; Mc Auley, Edel; Dowling, Paul; Swan, Niall; Moriarty, Michael; Barnham, Paul; Clynes, Martin; Larkin, Annemarie
Abstract:
Development of more effective therapeutic strategies for cancers of high unmet need requires the continued discovery of disease-specific protein targets for therapeutic antibody targeting. In order to identify novel proteins associated with cancer cell invasion/metastasis, we present here an alternative to antibody targeting of cell surface proteins with an established role in invasion; our functional antibody screening approach involves the isolation and selection of MAbs that are primarily screened for their ability to inhibit tumour invasion. A clonal population of the Mia PaCa-2, a pancreatic ductal adenocarcinoma (PDAC) cell line, which displays a highly invasive phenotype, was used to generate MAbs with the objective of identifying membrane targets directly involved in cancer invasion. Selected MAb 7B7 can significantly reduce invasion in a dose-responsive manner in Mia PaCa-2 clone 3 and DLKP-M squamous lung carcinoma cells. Using immunoprecipitation and liquid chromatography...
http://mural.maynoothuniversity.ie/6927/
Marked
Mark
A 100dB SFDR 0.5V pk-pk band-pass DAC implemented on a low voltage CMOS process
(2012)
Mullane, Brendan; O'Brien, Vincent
A 100dB SFDR 0.5V pk-pk band-pass DAC implemented on a low voltage CMOS process
(2012)
Mullane, Brendan; O'Brien, Vincent
Abstract:
Direct Digital Synthesis (DDS) systems generate fine frequency resolution signals over a broad spectrum that are used in a wide variety of applications such as multi-mode RF, communications, measurements and test. A high performance DDS band-pass Digital to Analog Converter (DAC) architecture and implementation is presented that delivers high spectral purity over a narrow-band response. The low power D/A Converter is portable to standard CMOS processes and designed to achieve over 100dB narrow-band SFDR performance using Sigma-Delta (ΣΔ) modulation and multi-bit current steering techniques. A 3rd order digital ΣΔ modulator is combined with a 4th order digital Dynamic Element Matching (DEM) block to shape the noise while calibrating for process mismatch variations. A low silicon area output stage is used to deliver a high performance specification.
ACCEPTED
Peer reviewed
http://hdl.handle.net/10344/5652
Marked
Mark
A 2-MS/s, 11.22 ENOB, extended input range SAR ADC with improved DNL and offset calculation
(2018)
Asghar, Sohail; Afridi, Sohaib Saadat; Pillai, Anu; Schuler, Anita; de la Rosa José; O&...
A 2-MS/s, 11.22 ENOB, extended input range SAR ADC with improved DNL and offset calculation
(2018)
Asghar, Sohail; Afridi, Sohaib Saadat; Pillai, Anu; Schuler, Anita; de la Rosa José; O'Connell, Ivan
Abstract:
A 12-bit successive approximation register analog-to-digital converter (ADC) with extended input range is presented. Employing an input sampling scaling technique, the presented ADC can digitize the signals with an input range of 3.2 V pp-d (±1.33 V REF ). The circuit also includes a comparator offset compensation technique that results in a residual offset of less than 0.5 LSB. The chip has been designed and implemented in a 0.13-μm CMOS process and demonstrates the state-of-the-art performance, featuring an SNDR of 69.3 dB and the SFDR of 79 dB without requiring any calibration. Total power consumption of the ADC is 0.9 mW, with a measured differential non-linearity of 1.2/-1.0 LSB and INL of 2.3/-2.2 LSB.
http://hdl.handle.net/10468/9657
Marked
Mark
A 3D hand motion capture device with haptic feedback for virtual reality applications
(2018)
Torres-Sanchez, Javier; Tedesco, Salvatore; O'Flynn, Brendan
A 3D hand motion capture device with haptic feedback for virtual reality applications
(2018)
Torres-Sanchez, Javier; Tedesco, Salvatore; O'Flynn, Brendan
Abstract:
In this paper, the challenges associated with the design of new generation hand motion capture devices for Virtual Reality (VR) applications are described. The need for developing a hand motion capture device with tactile feedback that integrates all the sensors and actuators associated with VR, while meeting the latency requirements is introduced. A detailed description of functional and non-functional specifications is also given. Finally, a comparison study with commercially available technology is provided highlighting that the proposed device compares favorably not only in terms of functional parameters, such as connectivity, integration of sensors and actuators, and latency, but also in terms of non-functional parameters, e.g., no need to wash, ambidextrous features and modularity.
http://hdl.handle.net/10468/7183
Marked
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A bandwidth enhanced 915 MHz antenna for IoT wrist-watch applications
(2019)
Kumar, Sanjeev; Buckley, John; Barton, John; Newberry, Robert; Dunlop, Gary; Rodencal, ...
A bandwidth enhanced 915 MHz antenna for IoT wrist-watch applications
(2019)
Kumar, Sanjeev; Buckley, John; Barton, John; Newberry, Robert; Dunlop, Gary; Rodencal, Matthew; Webster, Carlo; O'Flynn, Brendan
Abstract:
This paper presents a 915 MHz planar inverted-F antenna (PIFA) topology for a wrist-worn wireless sensor application. When compared with a conventional PIFA implementation, an impedance bandwidth enhancement of more than 100% is achieved. The bandwidth enhancement is realized with inclusion of a parasitic element that excites an additional mode close to the resonant frequency. A parametric analysis of the key parameters is performed in order to optimize the antenna for 915 MHz operation. The measured results for the on-body prototype antenna show a -10 dB bandwidth of 26.4 MHz and a Peak Realized Gain of -0.57 dBi at 915 MHz. The simulated peak radiation efficiency of 46.8% is achieved. In addition, the design exhibits a low specific absorption rate (SAR) value of 0.004 W/kg.
http://hdl.handle.net/10468/7861
Marked
Mark
A Bayesian approach to comparing theoretic models to observational data: A case study from solar flare physics
(2011)
GALLAGHER, PETER THOMAS
A Bayesian approach to comparing theoretic models to observational data: A case study from solar flare physics
(2011)
GALLAGHER, PETER THOMAS
Abstract:
Solar flares are large-scale releases of energy in the solar atmosphere, which are characterized by rapid changes in the hydrodynamic properties of plasma from the photosphere to the corona. Solar physicists have typically attempted to understand these complex events using a combination of theoretical models and observational data. From a statistical perspective, there are many challenges associated with making accurate and statistically significant comparisons between theory and observations, due primarily to the large number of free parameters associated with physical models. This class of ill-posed statistical problem is ideally suited to Baysian methods. In this paper, the solar flare studied by Raftery et al. (2008) is reanalysed using a Baysian framework. This enables us to study the evolution of the flare's temperature, emission measure and energy loss in a statistically self-consistent manner. The Baysian-based techniques confirm that both conductive and non-thermal bea...
http://hdl.handle.net/2262/59497
Marked
Mark
A bioactive metallurgical grade porous silicon-polytetrafluoroethylene sheet for guided bone regeneration applications
(2014)
Chadwick, Edward G.; Clarkin, O.M.; Raghavendra, Ramesh; Tanner, David A.
A bioactive metallurgical grade porous silicon-polytetrafluoroethylene sheet for guided bone regeneration applications
(2014)
Chadwick, Edward G.; Clarkin, O.M.; Raghavendra, Ramesh; Tanner, David A.
Abstract:
The properties of porous silicon make it a promising material for a host of applications including drug delivery, molecular and cell-based biosensing, and tissue engineering. Porous Silicon has previously shown its potential for the controlled release of pharmacological agents and in assisting bone healing. Hydroxyapatite, the principle constituent of bone, allows osteointegration in vivo, due to its chemical and physical similarities to bone. Synthetic hydroxyapatite is currently applied as a surface coating to medical devices and prosthetics, encouraging bone in-growth at their surface & improving osseointegration. This paper examines the potential for the use of an economically produced porous silicon particulate-polytetrafluoroethylene sheet for use as a guided bone regeneration device in periodontal and orthopaedic applications. The particulate sheet is comprised of a series of microparticles in a polytetrafluoroethylene matrix and is shown to produce a stable hydroxyapatit...
http://hdl.handle.net/10344/3976
Marked
Mark
A Bridgman Furnace Front Tracking Model
(2015)
Mooney, Robin Patrick
A Bridgman Furnace Front Tracking Model
(2015)
Mooney, Robin Patrick
Abstract:
The Bridgman furnace is widely used in industry and research, mainly because it provides a means to directionally solidify materials in a controlled manner, so that the resulting microstructure, and hence material properties, can be manipulated. This thesis details, firstly, the development and verification of a numerical Front Tracking Model (FTM) to track the position of, and growth conditions at, the columnar front during transient directional solidification in a Bridgman furnace; and, secondly, its application to experiments investigating Columnar to Equiaxed Transition (CET) in a gamma TiAl multicomponent hypoperitectic alloy. Previous FTMs have been applied in fixed grid numerical domains where the solidifying material - normally of hypoeutectic composition - is contained within that domain throughout simulations; the model demonstrated here accounts for movement of material through the domain and is adapted for hypoperitectic solidification. The model is applied, firstly, to ...
http://hdl.handle.net/2262/74991
Marked
Mark
A cell-based evaluation of a non-essential amino acid formulation as a non-bioactive control for activation and stimulation of muscle protein synthesis using ex vivo human serum
(2019)
Patel, Bijal; Pauk, Martina; Amigo-Benavent, Miryam; Nongonierma, Alice B.; Fitzgerald,...
A cell-based evaluation of a non-essential amino acid formulation as a non-bioactive control for activation and stimulation of muscle protein synthesis using ex vivo human serum
(2019)
Patel, Bijal; Pauk, Martina; Amigo-Benavent, Miryam; Nongonierma, Alice B.; Fitzgerald, Richard J.; Jakeman, Philip M.; Carson, Brian P.
Abstract:
The purpose of this study was to compare the effect of treating skeletal muscle cells with media conditioned by postprandial ex vivo human serum fed with either isonitrogenous Non-Essential Amino Acid (NEAA) or a whey protein hydrolysate (WPH) on stimulating Muscle Protein Synthesis (MPS) in C2C12 skeletal muscle cells. Methods Blood was taken from six young healthy males following overnight fast (fasted) and 60 min postprandial (fed) ingestion of either WPH or NEAA (0.33 g.kg-1 Body Mass). C2C12 myotubes were treated with media conditioned by ex vivo human serum (20%) for 4 h. Activation of MPS signalling (phosphorylation of mTOR, P70S6K and 4E-BP1) were determined in vitro by Western Blot and subsequent MPS were determined in vitro by Western Blot and surface sensing of translation technique (SUnSET) techniques, respectively. Results Media conditioned by NEAA fed serum had no effect on protein signalling or MPS compared to fasted, whereas media conditioned by WPH fed serum signifi...
http://hdl.handle.net/10344/8309
Marked
Mark
A cloud reservation system for big data applications
(2017)
Marinescu, Dan C.; Paya, Ashkan; Morrison, John P.
A cloud reservation system for big data applications
(2017)
Marinescu, Dan C.; Paya, Ashkan; Morrison, John P.
Abstract:
Emerging Big Data applications increasingly require resources beyond those available from a single server and may be expressed as a complex workflow of many components and dependency relationships-each component potentially requiring its own specific, and perhaps specialized, resources for its execution. Efficiently supporting this type of Big Data application is a challenging resource management problem for existing cloud environments. In response, we propose a two-stage protocol for solving this resource management problem. We exploit spatial locality in the first stage by dynamically forming rack-level coalitions of servers to execute a workflow component. These coalitions only exist for the duration of the execution of their assigned component and are subsequently disbanded, allowing their resources to take part in future coalitions. The second stage creates a package of these coalitions, designed to support all the components in the complete workflow. To minimize the communicat...
http://hdl.handle.net/10468/8414
Marked
Mark
A companding approach for nonuniform quantization of digital holograms of three-dimensional objects
(2006)
Shortt, Alison; Naughton, Thomas J.; Javidi, Bahram
A companding approach for nonuniform quantization of digital holograms of three-dimensional objects
(2006)
Shortt, Alison; Naughton, Thomas J.; Javidi, Bahram
Abstract:
We apply two novel nonuniform quantization techniques to digital holograms of three-dimensional real-world objects. Our companding approach, combines the efficiency of uniform quantization with the improved performance of nonuniform quantization. We show that the performance of companding techniques can be comparable with k-means clustering and a competitive neural network, while only requiring a single-pass processing step. The quantized holographic pixels are coded using lossless techniques for the calculation of compression ratio.
http://mural.maynoothuniversity.ie/8628/
Marked
Mark
A comparative study of the structural, mechanical and tribological characteristics of TiSiC-Cr coatings prepared in CH4 and C2H2 reactive atmosphere by cathodic vacuum arc
(2017)
Braic, Mariana; Vladescu, Alina; Balaceanu, Mihai; Luculescu, Catalin; Padmanabhan, Sib...
A comparative study of the structural, mechanical and tribological characteristics of TiSiC-Cr coatings prepared in CH4 and C2H2 reactive atmosphere by cathodic vacuum arc
(2017)
Braic, Mariana; Vladescu, Alina; Balaceanu, Mihai; Luculescu, Catalin; Padmanabhan, Sibu C.; Constantin, Lidia; Morris, Michael A.; Braic, V.; Grigorescu, Cristiana E. A.; Ionescu, Paul; Dracea, Maria Diana; Logofatu, Constantin
Abstract:
TiSiC-Cr coatings, with Cr and Si as additional elements, were deposited on Si, C 45 and 316 L steel substrates via cathodic arc evaporation. Two series of coatings with thicknesses in the range of 3.6–3.9 μm were produced, using either CH4 or C2H2 as carbon containing gas. For each series, different coatings were prepared by varying the carbon rich gas flow rate between 90 and 130 sccm, while maintaining constant cathode currents (110 and 100 A at TiSi and Cr cathodes, respectively), substrate bias (–200 V) and substrate temperature (∼320 °C). The coatings were analyzed for their mechanical characteristics (hardness, adhesion) and tribological performance (friction, wear), along with their elemental and phase composition, chemical bonds, crystalline structure and cross-sectional morphology. The coatings were found to be formed with nano-scale composite structures consisting of carbide crystallites (grain size of 3.1–8.2 nm) and amorphous hydrogenated carbon. The experimental result...
http://hdl.handle.net/10468/3460
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A Comparison of Ensemble and Case-Base Maintenance Techniques for Handling Concept Drift in Spam Filtering
(2005)
Delany, Sarah Jane; Cunningham, Padraig; Tsymbal, Alexey
A Comparison of Ensemble and Case-Base Maintenance Techniques for Handling Concept Drift in Spam Filtering
(2005)
Delany, Sarah Jane; Cunningham, Padraig; Tsymbal, Alexey
Abstract:
TCD-CS-2005-19
The problem of concept drift has recently received considerable attention in machine learning research. One important practical problem where concept drift needs to be addressed is spam filtering. The literature on concept drift shows that among the most promising approaches are ensembles and a variety of techniques for ensemble construction has been proposed. In this paper we consider an alternative lazy learning approach to concept drift whereby a single case-based classifier for spam filtering keeps itself up-to-date through a case-base maintenance protocol. We present an evaluation that shows that the case-base maintenance approach is more effective than a variety of ensemble techniques. The evaluation is complicated by the overriding importance of False Positives (FPs) in spam filtering. The ensemble approaches can have very good performance on FPs because it is possible to bias an ensemble more strongly away from FPs than it is to bias the single classifer. ...
http://hdl.handle.net/2262/13439
Marked
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A computational model of counterfactual thinking: The temporal order effect
(2001)
BYRNE, RUTH MARY JOSEPHINE
A computational model of counterfactual thinking: The temporal order effect
(2001)
BYRNE, RUTH MARY JOSEPHINE
Abstract:
People generate counterfactual alternatives to realitywhen they think about how things might have happeneddifferently, 'if only?'. There are considerableregularities in the sorts of past events that peoplementally undo, for example, they tend to mentally undothe most recent event in an independent sequence.Consider a game in which two contestants will win#1000 if they both pick cards from the same color suite.The first player picks black and the second red and theylose. Most people spontaneously undo the outcome bythinking, if only the second player had picked black. Wedescribe a computational model that simulates our theoryof the mental representations and cognitive processesunderlying this temporal order effect. The computermodel is corroborated by tests of the novel predictions ofour theory: it should be possible to reverse the temporalorder effect by manipulating the way in which thewinning conditions are described.
http://hdl.handle.net/2262/39493
Marked
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A cost-capacity analysis for assessing the efficiency of heterogeneous computing assets in an enterprise cloud
(2013)
Iglesias, Jesus Omana; Perry, Philip; Stokes, Nicola; Thorburn, James; Murphy, Liam
A cost-capacity analysis for assessing the efficiency of heterogeneous computing assets in an enterprise cloud
(2013)
Iglesias, Jesus Omana; Perry, Philip; Stokes, Nicola; Thorburn, James; Murphy, Liam
Abstract:
Cloud providers and organizations with a large IT infrastructure manage evolving sets of hardware resources that are subject to continual change. As existing computing assets age, newer, more capable and more efficient ones are generally acquired. Significant variability of hardware components leads to inefficient use of computing assets within the organization. We claim that only a detailed understanding of the whole infrastructure will lead to significant optimizations and savings. In this paper we report results on a dataset of 1,171 assets from two different data centers, on which we present a thorough analysis of how the costs of running a computing asset are related to its resource capacity (i.e., CPU and RAM). This analysis is formalized in a cost model that could be used by organizations to make an optimal decision with regards to which computing assets should migrate their workload (i.e. should be disconnected or discarded) and which ones should receive such workload.
http://hdl.handle.net/10344/3655
Marked
Mark
A dairy-derived ghrelinergic hydrolysate modulates food intake in vivo
(2018)
Howick, Ken; Wallace-Fitzsimons, Shauna E.; Kandil, Dalia; Chruścicka, Barbara; Calis, ...
A dairy-derived ghrelinergic hydrolysate modulates food intake in vivo
(2018)
Howick, Ken; Wallace-Fitzsimons, Shauna E.; Kandil, Dalia; Chruścicka, Barbara; Calis, Mert; Murphy, Eoin; Murray, Brian A.; Fernandez, Ayoa; Barry, Kate M.; Kelly, Phil M.; Ryan, Aoife M.; Cryan, John F.; Griffin, Brendan T.; Schellekens, Harriët
Abstract:
Recent times have seen an increasing move towards harnessing the health-promoting benefits of food and dietary constituents while providing scientific evidence to substantiate their claims. In particular, the potential for bioactive protein hydrolysates and peptides to enhance health in conjunction with conventional pharmaceutical therapy is being investigated. Dairy-derived proteins have been shown to contain bioactive peptide sequences with various purported health benefits, with effects ranging from the digestive system to cardiovascular circulation, the immune system and the central nervous system. Interestingly, the ability of dairy proteins to modulate metabolism and appetite has recently been reported. The ghrelin receptor (GHSR-1a) is a G-protein coupled receptor which plays a key role in the regulation of food intake. Pharmacological manipulation of the growth hormone secretagogue receptor-type 1a (GHSR-1a) receptor has therefore received a lot of attention as a strategy to...
http://hdl.handle.net/10468/8672
Marked
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A demonstration of wireless sensing for long-term monitoring of water quality
(2009)
Regan, Fiona; Lawlor, Antoin; O'Flynn, Brendan; Torres-Sanchez, Javier; Martínez-C...
A demonstration of wireless sensing for long-term monitoring of water quality
(2009)
Regan, Fiona; Lawlor, Antoin; O'Flynn, Brendan; Torres-Sanchez, Javier; Martínez-Català, Rafael V.; Ó Mathúna, S. Cian; Wallace, John
Abstract:
At a time when technological advances are providing new sensor capabilities, novel network capabilities, long-range communications technologies and data interpreting and delivery formats via the World Wide Web, we never before had such opportunities to sense and analyse the environment around us. However, the challenges exist. While measurement and detection of environmental pollutants can be successful under laboratory-controlled conditions, continuous in-situ monitoring remains one of the most challenging aspects of environmental sensing. This paper describes the development and test of a multi-sensor heterogeneous real-time water monitoring system. A multi-sensor system was deployed in the River Lee, County Cork, Ireland to monitor water quality parameters such as pH, temperature, conductivity, turbidity and dissolved oxygen. The R. Lee comprises of a tidal water system that provides an interesting test site to monitor. The multi-sensor system set-up is described and results o...
http://hdl.handle.net/10468/180
Marked
Mark
A disciplined innovation approach to health technology solutions
(2017)
Carroll, Noel; Richardson, Ita
A disciplined innovation approach to health technology solutions
(2017)
Carroll, Noel; Richardson, Ita
Abstract:
Despite the potential of innovation-driven healthcare technology services to increase the quality, accessibility and quality of care, the realization and success of such promise has yet to be achieved. This prompted us to explore the barriers towards success for healthcare software companies and examine what frameworks are employed across industry to support their growth in the digital healthcare market. As part of a three-phase study, this article reports on the first phase -to synthesize the literature on the readiness factors for healthcare technology companies. The findings of this research will guide our second phase of this research in surveying industry healthcare software companies. In so doing, we can establish readiness factors for healthcare software companies with a view to offering a more structured and disciplined approach to healthcare innovation.
ACCEPTED
peer-reviewed
http://hdl.handle.net/10344/6384
Marked
Mark
A double prodrug system for colon targeting of benzenesulfonamide COX-2 inhibitors
(2011)
WINDLE, HENRY; GILMER, JOHN FRANCIS; KELLEHER, DERMOT P; KEOGH, BRIAN; REILLY, MARY
A double prodrug system for colon targeting of benzenesulfonamide COX-2 inhibitors
(2011)
WINDLE, HENRY; GILMER, JOHN FRANCIS; KELLEHER, DERMOT P; KEOGH, BRIAN; REILLY, MARY
Abstract:
The design, synthesis and delivery potential of a new type of benzenesulfonamide cyclo-oxygenase-2 (COX-2) inhibitor prodrug is investigated using celecoxib. The approach involves a double prodrug that is activated first by azoreductases and then by cyclization triggering drug release. We studied the intramolecular aminolysis of the acylsulfonamide. The cyclization was surprisingly rapid at physiological pH and very fast at pH 5. The prodrug is activated specifically under conditions found in the colon but highly stable in the presence of human and rodent intestinal extracts. Finally, the prototype with celecoxib was transported much more slowly in the Caco-2 transepithelial model than the parent. The design therefore shows significant promise for the site specific delivery of benzenesulfonamide COX-2 inhibitors to the colon.
http://hdl.handle.net/2262/60695
Marked
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A fair comparison of VM placement heuristics and a more effective solution
(2014)
Li, Xi; Ventresque, Anthony; Murphy, John; Thorburn, James
A fair comparison of VM placement heuristics and a more effective solution
(2014)
Li, Xi; Ventresque, Anthony; Murphy, John; Thorburn, James
Abstract:
Data center optimization, mainly through virtual machine (VM) placement, has received considerable attention in the past years. A lot of heuristics have been proposed to give quick and reasonably good solutions to this problem. However it is difficult to compare them as they use different datasets, while the distribution of resources in the datasets has a big impact on the results. In this paper we propose the first benchmark for VM placement heuristics and we define a novel heuristic. Our benchmark is inspired from a real data center and explores different possible demographics of data centers, which makes it suitable when comparing the behaviour of heuristics. Our new algorithm, RBP, outperforms the state-of-the-art heuristics and provides close to optimal results quickly.
http://hdl.handle.net/10344/4359
Marked
Mark
A Front Tracking Model for Transient Solidification of Al-7wt%Si in a Bridgman Furnace
(2012)
MOONEY, ROBIN
A Front Tracking Model for Transient Solidification of Al-7wt%Si in a Bridgman Furnace
(2012)
MOONEY, ROBIN
Abstract:
The Bridgman furnace is widely used in industry and research. This paper outlines a working onedimensional model for tracking the columnar solidification front in a Bridgman furnace where the pulling velocity, and hence front position, change as a function of time. The front tracking model is applied to a fixed grid of control volumes using an explicit numerical finite difference scheme to solve the heat equation over a finite domain. The model is demonstrated by way of a notional scenario, namely, Bridgman furnace solidification of a 16-mm diameter rod of Al?7wt%Si. The results show how the evolution of temperature distribution, thermal history, and front position are affected by a step change in pulling velocity.
http://hdl.handle.net/2262/76203
Marked
Mark
A functional assessment of the sperm membrane: a multi-species approach
(2014)
Murphy, Craig
A functional assessment of the sperm membrane: a multi-species approach
(2014)
Murphy, Craig
Abstract:
A functional sperm membrane is essential for many of the processes which lead to the fertilisation of an oocyte, but this membrane is susceptible to oxidative damage with increasing duration of storage in liquid semen or during the cryopreservation process. The objectives of this thesis were to examine the effects of storage temperature, catalase supplementation and sperm number on the membrane function of liquid stored bull semen, sperm membrane protein profile on the membrane integrity of liquid stored boar semen and stabilisation of the stallion sperm membrane using cholesterol, prior to cryopreservation, on the membrane function of frozen-thawed stallion semen. Sperm progressive motility was assessed by microscopy, glucose consumption and total antioxidant capacity were assessed using commercial kits, and viability, oxidative stress, mitochondrial activity, acrosomal status and membrane fluidity were assessed by flow cytometry. Conception rates in dairy cows were assessed as the...
http://hdl.handle.net/10344/4433
Marked
Mark
A General-Purpose Taxonomy of Computer-Augmented Sports Systems
(2009)
Cahill, Vinny; Haahr, Mads; Reilly, Sean; Barron, Peter; Moran, Kieran
A General-Purpose Taxonomy of Computer-Augmented Sports Systems
(2009)
Cahill, Vinny; Haahr, Mads; Reilly, Sean; Barron, Peter; Moran, Kieran
Abstract:
10.4018/978-1-60566-406-4.ch00
The area of computer-augmented sports is large and complex and spans several disciplines. This chapter presents a general-purpose taxonomy of computer-augmented sports systems, which is intended to assist researchers and designers working in this domain. Allowing systems to be classified with regard to form as well as function, the taxonomy is intended to have several uses, including serving as a clear map to aid in the understanding of the domain and as a tool to help researchers analyse the state-of-the-art by characteristics of systems. The taxonomy also offers a common vocabulary to the multidisciplinary teams that work in computer-augmented sports and can be used to identify sparsely populated regions of the domain as promising areas for future research. The authors present and demonstrate the use of the taxonomy using four example systems selected from an extensive review.
http://hdl.handle.net/2262/89974
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