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Articles 7531 - 7560 of 9182
Full-Text Articles in Entire DC Network
Groundplane Dependent Performance Of Printed Antenna For Mb-Ofdm-Uwb, Sergio Curto, Matthias John, Max Ammann
Groundplane Dependent Performance Of Printed Antenna For Mb-Ofdm-Uwb, Sergio Curto, Matthias John, Max Ammann
Conference papers
A printed ultra wideband (UWB) antenna suitable for multiband orthogonal frequency division multiplexing (MB-OFDM) UWB is presented in this paper. The proposed antenna covers a wide band from 3.1 GHz to 11.2 GHz. Good performance and low cost production was obtained using FR-4 substrate. An examination of the effects of ground plane dimensions on antenna properties such as gain, bandwidth and radiation pattern is made.
Inset-Fed Mircrostrip Patch Antenna With Integrated Polycrystalline Photovoltaic Solar Cell, S. Shynu, Maria Roo Ons, Max Ammann, Sarah Gallagher, Brian Norton
Inset-Fed Mircrostrip Patch Antenna With Integrated Polycrystalline Photovoltaic Solar Cell, S. Shynu, Maria Roo Ons, Max Ammann, Sarah Gallagher, Brian Norton
Conference papers
A novel method of integrating microstrip patch antennas and polycrystalline silicon solar cells for application in autonomous communication systems is presented. The DC and RF functions are intimately linked, by using the silver DC bus bars of the solar cell as the ground plane of the microstrip patch. The performance of the solar antenna is compared with standard microstrip patch. Detailed studies of the effect of the solar cell on the microstrip antenna are then carried out. The effects of solar cell integration, DC loading and variation in incident photon intensity of the silicon layer on the performance of the …
The Role Of Information And Communications Technology (Ict) In The Supply Chain, Ronan Mcdonnell, John Kenny, Edward Sweeney
The Role Of Information And Communications Technology (Ict) In The Supply Chain, Ronan Mcdonnell, John Kenny, Edward Sweeney
Books/Book chapters
No abstract provided.
The Regenerative Rebuilding Strategy For Sustainable Coastal Communities. An Architectural Thesis And Case Study Of Rebuilding Post-Tsunami Sri Lanka., Kristina Iverson, Shannon Chance
The Regenerative Rebuilding Strategy For Sustainable Coastal Communities. An Architectural Thesis And Case Study Of Rebuilding Post-Tsunami Sri Lanka., Kristina Iverson, Shannon Chance
Conference papers
Developments are occurring at a rapid pace along coastlines all over the world. In fact a full two-thirds of the world’s population, or 4 billion people, live within 250 miles of a coast1. In the United States architects have recognized the negative effects of existing building practices on beaches. In fact, designers have eagerly adopted methods of “sustainable design” to band-aid the problem. While seemingly an improvement upon past building practices, current movements in sustainable design focus on slowing down the degradation to the beach environment instead of encouraging healing practices. If we are to sustain the existence of both …
Hamiltonian Formulation, Nonintegrability And Local Bifurcations For The Ostrovsky Equation, S. Roy Choudhury, Rossen Ivanov, Yue Liu
Hamiltonian Formulation, Nonintegrability And Local Bifurcations For The Ostrovsky Equation, S. Roy Choudhury, Rossen Ivanov, Yue Liu
Articles
The Ostrovsky equation is a model for gravity waves propagating down a channel under the influence of Coriolis force. This equation is a modification of the famous Korteweg-de Vries equation and is also Hamiltonian. However the Ostrovsky equation is not integrable and in this contribution we prove its nonintegrability. We also study local bifurcations of its solitary waves.
Water Waves And Integrability, Rossen Ivanov
Water Waves And Integrability, Rossen Ivanov
Articles
The Euler’s equations describe the motion of inviscid fluid. In the case of shallow water, when a perturbative asymtotic expansion of the Euler’s equations is taken (to a certain order of smallness of the scale parameters), relations to certain integrable equations emerge. Some recent results concerning the use of integrable equation in modeling the motion of shallow water waves are reviewed in this contribution.
Development Of Probalistic Techniques For Network Assessment With Significant Wind Generation, Asim Mumtaz
Development Of Probalistic Techniques For Network Assessment With Significant Wind Generation, Asim Mumtaz
Masters
Due to increasing awareness of global warming and high energy costs, more electrical power is being generated by using renewable sources. However some of these sources are not as predictable as conventional generation and they also lack the ability to be dispatched in the same way. The increase in the amount of wind power connected to transmission networks has been significant in some countries. But due to the stochastic nature of wind power, it is difficult to predict exactly how much power can be generated at any given time. This variable nature of wind power can cause line overloading and …
Reconciling Organisational Realities With The Research Mission Of The Irish Institutes Of Technology, Deirdre Lillis
Reconciling Organisational Realities With The Research Mission Of The Irish Institutes Of Technology, Deirdre Lillis
Conference papers
A key principle in systems theory is that a system, such as a Higher Education Institute (HEI), will self-correct and stabilise to align itself with its overarching ‘system goals’, irrespective of interventions. System goals may be explicit and obvious, such as published performance indicators, however change initiatives can often fail because the initiative is acting against some underlying, implicit and/or hidden system goal. In addition, if one accepts the premise that people will work toward what is recognised and rewarded then the measures of performance used within a HEI are likely to be important forces for change in their own …
Slow Flow Between Concentric Cones, O. Hall, C. P. Hills, A. D. Gilbert
Slow Flow Between Concentric Cones, O. Hall, C. P. Hills, A. D. Gilbert
Articles
This paper considers the low-Reynolds-number flow of an incompressible fluid contained in the gap between two coaxial cones with coincident apices and bounded by a spherical lid. The two cones and the lid are allowed to rotate independently about their common axis, generating a swirling motion. The swirl induces a secondary, meridional circulation through inertial effects. For specific configurations complex eigenmodes representing an infinite sequence of eddies, analogous to those found in two-dimensional corner flows and some three-dimensional geometries, form a component of this secondary circulation. When the cones rotate these eigenmodes, arising from the geometry, compete with the forced …
Krylov Subspaces From Bilinear Representations Of Nonlinear Systems, Marissa Condon, Rossen Ivanov
Krylov Subspaces From Bilinear Representations Of Nonlinear Systems, Marissa Condon, Rossen Ivanov
Articles
For efficient simulation of state-of-the-art dynamical systems as arise in all aspects of engineering, the development of reduced-order models is of paramount importance. While linear reduction techniques have received considerable study, increasingly nonlinear model reduction is becoming a significant field of interest. From a circuits and systems viewpoint, systems involving micromachined devices or systems involving mixed technologies necessitate the development of reduced-order nonlinear models. From a control systems viewpoint, the design of controllers for nonlinear systems is greatly facilitated by nonlinear model reduction strategies. To this end, the paper proposes two novel model-reduction strategies for nonlinear systems. The first involves …
Spectroscopic Characterisation Of Novel Polycyclic Aromatic Polymers, Luke O'Neill, Patrick Lynch, Mary Mcnamara, Hugh Byrne
Spectroscopic Characterisation Of Novel Polycyclic Aromatic Polymers, Luke O'Neill, Patrick Lynch, Mary Mcnamara, Hugh Byrne
Articles
A series of novel polyphenylenevinylene (PPV) derivative polymers were studied by absorption and photoluminescence spectroscopies. The effect of the sequential introduction of polycyclic aromatic ring substituents into the delocalized backbone was examined with relation to hypsochromatic and bathochromatic shifting. While the replacement of the phenyl units by naphthyl units results in a substantial hypsochromic shift of both the absorption and emission spectra, their subsequent substitution by anthryl units results in a bathochromic shift. The system is modeled according to, and is found to be consistent with, a previous study of donor-acceptor polyenes of varying length. The electronic structure of the …
Miniaturized Annular Ring Loaded Patch Antennas, Max Ammann, Xiulong Bao
Miniaturized Annular Ring Loaded Patch Antennas, Max Ammann, Xiulong Bao
Conference papers
The proliferation of wireless communication systems has promoted the development of miniaturized antenna designs. Annular ring patch antennas are reported to reduce antenna size. In this paper, several novel compact probe-fed annular-ring microstrip patch antennas are presented. In order to reduce the antenna size and provide a suitable input impedance match, two techniques are employed; the insertion of strips into the annular ring and placing a cross-slot into the ground plane. The proposed annular-ring patch antennas with a cross-slotted ground plane yield a much smaller size for a given frequency and are easily matched to 50 Ohms. These novel patch …
Low-Profile Rolled Planar Antenna With Wide Bandwidth, Giuseppe Ruvio, Max Ammann
Low-Profile Rolled Planar Antenna With Wide Bandwidth, Giuseppe Ruvio, Max Ammann
Conference papers
A novel size-reduction technique for a planar monopole type antenna is presented. By rolling the planar element of this antenna, a low-profile radiator with broad impedance bandwidth is obtained without excessively perturbing its radiation properties. The proposed antenna is capable of covering frequencies in the range 3.1 GHz to 15 GHz. The antenna yields a high gain with high radiation efficiency across the full bandwidth. Radiation patterns show good omnidirectional features, so it is a remarkable candidate for in-door or vehicular applications where large frequency range is required
Investigation On Miniature Wideband Patch Antenna For Portable Wireless And Cellular Applications, Xiulong Bao, Max Ammann
Investigation On Miniature Wideband Patch Antenna For Portable Wireless And Cellular Applications, Xiulong Bao, Max Ammann
Conference papers
A low-profile miniature antenna with very wide bandwidth is proposed for emerging multimode devices. It comprises a small circular patch antenna loaded by a metallic annular-ring and located on a laminate with a slotted ground plane. The design achieves a very compact low-profile antenna with broadband performance. By optimizing the parameters of the annular-ring patch antenna, very broadband characteristics can be obtained. The measured results show that the antenna achieves a 10 dB return loss from 1.383 GHz to 2.210 GHz, (827 MHz) ie about 47% with respect to the centre frequency 1.796 GHz. The measured results are in good …
High Quality Millimeter Wave Generation Via Stimulated Brillouin Scattering, Marcus Junker, Thomas Schneider, Kai-Uwe Lauterbach, Ronny Henker, Max Ammann, Andreas Schwarzbacher
High Quality Millimeter Wave Generation Via Stimulated Brillouin Scattering, Marcus Junker, Thomas Schneider, Kai-Uwe Lauterbach, Ronny Henker, Max Ammann, Andreas Schwarzbacher
Conference papers
A new and simple method for the generation and modulation of Millimeter waves is presented. Based on frequency upconversion via Stimulated Brillouin Scattering, it is very flexible in its output frequency and modulation bandwidth.
Some Techniques To Improve Small Groundplane Printed Monopole Performance, Max Ammann, Matthias John
Some Techniques To Improve Small Groundplane Printed Monopole Performance, Max Ammann, Matthias John
Conference papers
Printed planar monopole antennas are enjoying considerable popularity and publicity to their low-profile, wide bandwidth, quasi-omnidirectional radiation characteristics and their ease of integratability into devices. The impedance bandwidth and radiation properties of a strip monopole have been shown to be heavily dependent on groundplane size. The groundplane (GP) is of primary importance and when miniaturised, the antenna properties change significantly. Techniques to improve the performance of printed antennas on small groundplanes are presented.
Slow And Fast-Light In Optical Fibers: An Overview, Ronny Henker, Thomas Schneider, Kai-Uwe Lauterbach, Markus Junker, Max Ammann, Andreas Schwarzbacher
Slow And Fast-Light In Optical Fibers: An Overview, Ronny Henker, Thomas Schneider, Kai-Uwe Lauterbach, Markus Junker, Max Ammann, Andreas Schwarzbacher
Conference papers
Slow- and fast-light is the control of the velocity of light in a medium by light. As a fascinating new field in physics there is a fundamental interest on this effect on the one side, but on the other side there exist a lot of practical applications for telecommunication and information systems. Among these are optical signal processing, the radio frequency-photonics, nonlinear optics and spectroscopy in time domain. Furthermore, the slow- and fast-light effect can be seen as a key technology for optical delay lines, buffers, equalizers and synchronizers in packed switched networks. To realize the effect there are different …
Identification Of A Time-Delayed Process Model Using An Overparameterisation Method, John Roe, Ruiyao Gao, Aidan O'Dwyer
Identification Of A Time-Delayed Process Model Using An Overparameterisation Method, John Roe, Ruiyao Gao, Aidan O'Dwyer
Conference papers
An extensive literature exists on the estimation of the model parameters of time-delayed processes. This paper briefly reviews the main overparameterisation methods for the Single-Input, Single Output (SISO) and Multi-Input, Multi-Output (MIMO) model parameter (and time delay) estimation problem. Subsequently, two algorithms, and their modifications, are discussed, and their performances are assessed in simulation. Results indicate that both the algorithms can suitably identify the model parameters, including the time delay. The third author has taught the method successfully to students taking advanced level control courses at DIT for a number of years; these experiences will be briefly reported. The paper …
Some Aspects Of Process Control In Semiconductor Manufacturing, Keelin Relihan, Shane Geraghty, Aidan O'Dwyer
Some Aspects Of Process Control In Semiconductor Manufacturing, Keelin Relihan, Shane Geraghty, Aidan O'Dwyer
Conference papers
This paper outlines some aspects of process control in semiconductor manufacturing. Starting with an outline of the semiconductor manufacturing process, the contribution will discuss temperature control of the chemical vapour deposition stage and the control of the wafer etching process, based on the industrial experience of the first two authors. Subsequently, the authors draw the attention of the semiconductor manufacturing community to the potential of properly tuned PID controllers for the achievement of simple and high performance control solutions.
Experiences Of Assessment Using Multiple Choice Questions On A First Year Engineering Module In Electrical Engineering, Aidan O'Dwyer
Experiences Of Assessment Using Multiple Choice Questions On A First Year Engineering Module In Electrical Engineering, Aidan O'Dwyer
Conference papers
This contribution will report on, and evaluate, the use of multiple-choice questions, in both continuous assessment and terminal examination modes, on a first year module in electrical engineering at Dublin Institute of Technology. The author’s experiences are that multiple-choice questions tend to be student friendly (e.g. given a choice in a terminal examination, students will opt to attempt the questions with multiple choice parts). The author has used the assessment method over three academic years, and some assessment data is reported and analysed in the contribution. The pedagogical approach is explicitly pragmatic.
Hazardous Emissions Monitoring And Control, Aidan O'Dwyer, Jesus Cabello
Hazardous Emissions Monitoring And Control, Aidan O'Dwyer, Jesus Cabello
Conference papers
There is an increasing awareness in society of the need to protect our fragile environment. Meeting environmental requirements is recognised as one of the six 21st century business drivers for automatic control. Chemical companies, for example, use automatic control to minimise waste production because of increasing prohibitions against discharge and/or disposal of toxic substances. New plants are moving towards a “zero-discharge” concept [1]. In a recent report [2], greater emphasis on automatic control is suggested as a technological response of both the speciality chemicals and pharmaceutical sub-sectors to key business drivers up to 2015. This contribution reports on recent developments …
Open Software To Innovation: The Critical Success Factors Of Massively Multiplayer Online Role Playing Games (Mmorpg) In China And Ireland., Wei Chen
Dissertations
This project investigates the factors leading to the success of China’s Massively Multiplayer Online Role Playing Games (MMORPG) market and gives an analysis of how Open source has contributed to these success factors. It then will look at how the use of open source is mirrored in Ireland’s market for example, the software sector to see if the same factors are apparent or there are indicators of these. Knowledge Management plays a very important role for fasten the innovation of Open source software development in China.
An Investigation Of Planar Monopole Antennas For Modern Portable Applications, Jonathan Arthur Evans
An Investigation Of Planar Monopole Antennas For Modern Portable Applications, Jonathan Arthur Evans
Doctoral
Current trends in portable and mobile communications are towards greater numbers of different systems often with wider bandwidths, operating within a single device. Antenna systems for these devices need to be capable of operating over a wide frequency range or multiple frequency bands, typically between 900MHz and 6GHz (e.g. GSM, IMT-2000, Wi-Fi and WiMax). Portable and mobile applications also require antennas to be optimised with respect to radiation pattern, efficiency and physical size. A greater understanding of the characteristics and design challenges of broadband and multi-band antennas forms the core motivation of this work. The antennas developed as part of …
Characteristics Of Cooked Chickpeas And Soybeans During Combined Microwave–Convective Hot Air Drying, Aoife Gowen, Nissreen Abu-Ghannam, Jesus Maria Frias, Jorge Oliveira
Characteristics Of Cooked Chickpeas And Soybeans During Combined Microwave–Convective Hot Air Drying, Aoife Gowen, Nissreen Abu-Ghannam, Jesus Maria Frias, Jorge Oliveira
Articles
Moisture content, shrinkage, water activity (Aw), color and texture of cooked chickpeas and soybeans during convective, microwave and combined microwave–convective drying were studied. Combined drying was significantly (P < 0.05) faster than either convective or microwave drying, and resulted in less shrinkage of the dehydrated product. Rapid burning occurred when samples were dried below a Aw of 0.27 ± 0.07 for chickpeas (P < 0.05), and 0.13 ± 0.04 for soybeans (P < 0.05). Both chickpeas and soybeans displayed a transitional behavior in texture when dried to a Aw below 0.40 ± 0.10 (P < 0.05) for chickpeas, and below 0.63 ± 0.15 (P < 0.05) for soybeans, when samples became brittle. Shelf stable dehydrated chickpea and soybean products with low water activity (Aw = 0.35) and good visual quality could be obtained within 14 min of combination drying.
Efficacy Of Steamer Jet-Injection As Alternative To Chlorine In Fresh-Cut Lettuce, Ana Belen Martin-Diana, Daniel Rico, Catherine Barry-Ryan, Jesus Maria Frias, Gary Henehan, J. Barat
Efficacy Of Steamer Jet-Injection As Alternative To Chlorine In Fresh-Cut Lettuce, Ana Belen Martin-Diana, Daniel Rico, Catherine Barry-Ryan, Jesus Maria Frias, Gary Henehan, J. Barat
Articles
Short-time steam processing was used as an alternative to chlorine (100 mg L−1) in sanitising fresh-cut lettuce. Quality (pH, water content, colour, potential browning, browning-related enzymes and texture), safety (mesophilic counts) and antioxidant markers (ascorbic and carotenoids) were monitored in lettuce stored for 10 days at 4 °C. The steam treatment produced a shocking effect on lettuce metabolism, showing a significant (p < 0.05) reduction in respiration (from day 3 to 7) and a partial inactivation of browning-related enzymes. Both effects were reflected in a significant reduction of browning. From a safety point of view, steam treatment kept the mesophilic load as low as chlorine treatment, and significantly lowers than the water control. However, antioxidant content, especially ascorbic acid but also carotenoids in a lower degree, showed a reduction compared with chlorine-treated samples. Despite the lower visual browning in steam-treated samples, the sensory panel scored similar values of acceptability and fresh appearance for both samples similarity.
Proteinparser:A Community Based Tool For The Generation Of A Detailed Protein Consensus And Fasta Output, Barry Ryan, Ronan Barrett
Proteinparser:A Community Based Tool For The Generation Of A Detailed Protein Consensus And Fasta Output, Barry Ryan, Ronan Barrett
Articles
Comparison of bioinformatic data is a common application in the life sciences and beyond. In this communication, a novel Java based software tool, ProteinParser, is outlined. This soft- ware tool calculates a detailed consensus, or most common, amino acid at a given position in an aligned protein set, whilst also generating a full consensus protein FASTA output. A second application of this software tool, computing a consensus amino acid given a toler- ance threshold, is also demonstrated. The phytase and the common bacterial �-lactamase proteins are analysed as ‘proof of concept’ examples. Consensus proteins, as generated by ProteinParser, are regularly …
Effects Of Single Mutations On The Stability Of Horseradish Peroxidase To Hydrogen Peroxide., Barry Ryan, CiaráN Fagan
Effects Of Single Mutations On The Stability Of Horseradish Peroxidase To Hydrogen Peroxide., Barry Ryan, CiaráN Fagan
Articles
Horseradish Peroxidase (HRP) is a commonly used enzyme in many biotechnological fields. Improvement of HRP stability would further increase its potential application range. In the present study, thirteen single- and three double- mutants of solvent exposed, proximal lysine and glutamic acid residues were analysed for enhanced H2O2 stability. Additionally, five single- and one pentuple-consensus mutants were investigated. Most mutants displayed little or no alteration in H2O2 stability; however, three (K232N, K241F and T110V) exhibit significantly increased H2O2 tolerances of 25- (T110V), 18- (K232N), and 12- fold (K241F). This improved stability may be due to an altered enzyme-H2O2 catalysis pathway or …
Arginine-To-Lysine Substitutions Influence Recombinant Horseradish Peroxidase Stability And Immobilisation Effectiveness., Barry Ryan, CiaráN Fagan
Arginine-To-Lysine Substitutions Influence Recombinant Horseradish Peroxidase Stability And Immobilisation Effectiveness., Barry Ryan, CiaráN Fagan
Articles
Background: Horseradish Peroxidase (HRP) plays important roles in many biotechnological fields, including diagnostics, biosensors and biocatalysis. Often, it is used in immobilised form. With conventional immobilisation techniques, the enzyme adheres in random orientation: the active site may face the solid phase rather than bulk medium, impeding substrate access and leading to sub-optimal catalytic performance. The ability to immobilise HRP in a directional manner, such that the active site would always face outwards from the insoluble matrix, would maximise the immobilised enzyme’s catalytic potential and could increase HRP’s range of actual and potential applications. Results: We have replaced arginine residues on …
Effects Of Mutations In The Helix G Region Of Horseradish Peroxidase, Barry Ryan, CiaráN Ó'FáGáIn
Effects Of Mutations In The Helix G Region Of Horseradish Peroxidase, Barry Ryan, CiaráN Ó'FáGáIn
Articles
Horseradish Peroxidase (HRP) has long attracted intense research interest and is used in many biotechnological fields, including diagnostics, biosensors and biocatalysis. Enhancement of HRP catalytic activity and/or stability would further increase its usefulness. Based on prior art, we substituted solvent-exposed lysine and glutamic acid residues near the proximal helix G (Lys 232, 241; Glu 238, 239) and between helices F and F’ (Lys 174). Three single mutants (K232N, K232F, K241N) demonstrated increased stabilities against heat (up to two-fold) and solvents (up to four-fold). Stability gains are likely due to improved hydrogen bonding and space-fill characteristics introduced by the relevant substitution. …
Computational Trust In Web Content Quality: A Comparative Evalutation On The Wikipedia Project, Pierpaolo Dondio
Computational Trust In Web Content Quality: A Comparative Evalutation On The Wikipedia Project, Pierpaolo Dondio
Articles
The problem of identifying useful and trustworthy information on the World Wide Web is becoming increasingly acute as new tools such as wikis and blogs simplify and democratize publication. It is not hard to predict that in the future the direct reliance on this material will expand and the problem of evaluating the trustworthiness of this kind of content become crucial. The Wikipedia project represents the most successful and discussed example of such online resources. In this paper we present a method to predict Wikipedia articles trustworthiness based on computational trust techniques and a deep domain-specific analysis. Our assumption is …