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Articles 7741 - 7770 of 9167
Full-Text Articles in Entire DC Network
Analysis Of Strain And Intermixing In Single-Layer Ge/Si Quantum Dots Using Polarized Raman Spectroscopy, Anna Baranov, A. V. Federov, Tatiana Perova, R. A. Moore, V. Yam, D. Bouchier, V. Le Thanh, Kevin Berwick
Analysis Of Strain And Intermixing In Single-Layer Ge/Si Quantum Dots Using Polarized Raman Spectroscopy, Anna Baranov, A. V. Federov, Tatiana Perova, R. A. Moore, V. Yam, D. Bouchier, V. Le Thanh, Kevin Berwick
Articles
The built-in strain and composition of as-grown and Si-capped single layers of Ge∕Si dots grown at various temperatures (460–800 °C) are studied by a comparative analysis of the Ge-Ge and Si-Ge modes in the polarized Raman spectra of the dots. A pronounced reduction of the strain and Ge content in the dots after deposition of the cap layer at low temperatures is observed, indicating that strain-induced Si diffusion from the cap layer is occurring. For large dots grown at 700–800 °C the observations are in agreement with a model of the Ge∕Si dot consisting of a Si-rich boundary region and …
Design Of One-Dimensional Composite Photonic Crystals With An Extended Photonic Band Gap, Vladimir Tolmachev, Kevin Berwick
Design Of One-Dimensional Composite Photonic Crystals With An Extended Photonic Band Gap, Vladimir Tolmachev, Kevin Berwick
Articles
A technique for photonic band gap (PBG) extension based on mixing photonic crystals with different lattice constants or filling factors is suggested. For the design of photonic crystals with maximal PBG extension the gap map imposition method is utilized. Gap maps for composite photonic crystals based on Si-air structures are calculated and used to predict optimal structures for fabrication.
Investigation On Annular-Ring Patch Antenna With Ebg Structure, Xiulong Bao, Giuseppe Ruvio, Max Ammann
Investigation On Annular-Ring Patch Antenna With Ebg Structure, Xiulong Bao, Giuseppe Ruvio, Max Ammann
Conference papers
An annular-ring loaded circular patch antenna with slot-ring array of EBG cells on the ground plane is presented. A comparison is made between the annular ring loaded patch on a conventional PEC groundplane and the same patch on a groundplane with a 2x2, a 4x4 and a 6x6 slot-ring EBG array. It was found that the annular-ring patch antenna with a 4 x 4 slot-ring array in the ground plane is superior in the overall performance (gain, impedance and axial-ratio bandwidth). The array of EBG was found to improve gain by 3.5dB and increase the bandwidth of input impedance by …
Fta And The City: Imagineering Sustainable Urban Development, John Ratcliffe, Elzbieta Krawczyk, Ruth Kelly
Fta And The City: Imagineering Sustainable Urban Development, John Ratcliffe, Elzbieta Krawczyk, Ruth Kelly
Articles
This paper argues that urban planners and policy-makers lack an effective future-oriented approach enabling them to comprehend current complexity, anticipate impending change and shape a preferred future condition. In doing so it: - reviews the performance of contemporary city planning; - examines the need to chart and navigate the city technosphere by reference to city capital; - explores ways in which planning can benefit from a futures studies approach; - describes generally how futures-oriented thinking can produce effective city prospective; and, - poses specifically a number of questions regarding the concept of the intelligent city’. The paper concludes by calling …
Final Evaluation Report Of The Go Project, Louise Mccann
Final Evaluation Report Of The Go Project, Louise Mccann
Reports
Evaluation report of the GO project commissioned by the DIT Community Links Programme and the Digital Media Centre, 2006.
Generation Of High Quality Audio Natural Emotional Speech Corpus Using Task Based Mood Induction, Charlie Cullen, Brian Vaughan, Spyros Kousidis, Yi Wang, Ciaran Mcdonnell, Dermot Campbell
Generation Of High Quality Audio Natural Emotional Speech Corpus Using Task Based Mood Induction, Charlie Cullen, Brian Vaughan, Spyros Kousidis, Yi Wang, Ciaran Mcdonnell, Dermot Campbell
Conference papers
Detecting emotional dimensions [1] in speech is an area of great research interest, notably as a means of improving human computer interaction in areas such as speech synthesis [2]. In this paper, a method of obtaining high quality emotional audio speech assets is proposed. The methods of obtaining emotional content are subject to considerable debate, with distinctions between acted [3] and natural [4] speech being made based on the grounds of authenticity. Mood Induction Procedures (MIP’s) [5] are often employed to stimulate emotional dimensions in a controlled environment. This paper details experimental procedures based around MIP 4, using performance related …
Managing Supply Chain Management Improvement Programs, Edward Sweeney
Managing Supply Chain Management Improvement Programs, Edward Sweeney
Practitioner Journals
No abstract provided.
B2b E-Marketplaces In The Airline Industry: A Study On Process Drivers And Performance Indicators, Claudia-Maria Wagner, Bernd Huber, Edward Sweeney
B2b E-Marketplaces In The Airline Industry: A Study On Process Drivers And Performance Indicators, Claudia-Maria Wagner, Bernd Huber, Edward Sweeney
Practitioner Journals
No abstract provided.
Recruiting First Year Engineering Undergraduates, Eddie Conlon
Recruiting First Year Engineering Undergraduates, Eddie Conlon
Conference papers
This paper presents findings of three surveys conducted with first year students in the Faculty of Engineering in the Dublin Institute of Technology. It presents evidence on the reasons students study engineering, their sources of information on higher education programmes and the people who influence their decision to do engineering. It shows there are gaps in the students’ knowledge of their programmes and also between their expectations and their experience of their course. Some proposed areas of action are identified to increase both recruitment and retention. It is argued that projecting an image of engineering as a creative activity would …
Hand Posture Recognition In Sign Language Using Shape Distributions, Eamonn Young, Gary Clynch
Hand Posture Recognition In Sign Language Using Shape Distributions, Eamonn Young, Gary Clynch
Conference Papers
A shape distribution is a histogram used to uniquely identify different shapes. The histogram is produced by taking random distances on the surface of a shape or object. Theoretically, each shape or object should produce a unique histogram, as the distribution of distances for each shape should be different. Shape distributions have recently been implemented in a number of object recognition areas. They are an attractive method as they are inherently simple, fast and generic. This paper presents the results of research undertaken on the application of shape distributions for the purpose of sign language recognition. There are four main …
International Collaboration In Blended Problem-Based Learning, Roisin Donnelly
International Collaboration In Blended Problem-Based Learning, Roisin Donnelly
Papers, presentations and other resources
European education today is characterized by two dominant trends. First, e-learning has made impressive advances in the past five years. Second, European higher education has become increasingly internationalized. Within this, there has been an obvious shift towards more social, collaborative and communal perspectives of learning reported in recent educational research. Various forms of collaborative and inquiry-based learning include the idea that learning should be understood as a combination of participation, knowledge creation and internal processes. This paper discusses the blending of e-learning and problem-based learning (PBL), based on these observations and as a comprehensive approach encompassing the learning environment, curriculum, …
Statistical Computation For Extreme Bridge Traffic Load Effects, Colin C. Caprani, E. J. O'Brien
Statistical Computation For Extreme Bridge Traffic Load Effects, Colin C. Caprani, E. J. O'Brien
Conference papers
The maintenance of highway infrastructure constitutes a major expenditure in many countries. This cost can be reduced significantly by minimizing the repair or replacement of highway bridges. In the assessment of existing bridges, the strength estimate tends to be more accurate than that of traffic loading, due to the more variable nature of loading. Recent advances in the statistical analysis of highway bridge traffic loading have resulted in more accurate forecasts of the actual loading to which a bridge is subject. While these advances require extensive numerical computation, they can significantly improve the accuracy of the calculation. This paper outlines …
An Explicit Scheme For Multifluid Magnetohydrodynamics, Stephen O'Sullivan, Turlough Downes
An Explicit Scheme For Multifluid Magnetohydrodynamics, Stephen O'Sullivan, Turlough Downes
Articles
When modelling astrophysical fluid flows, it is often appropriate to discard the canonical magnetohydrodynamic approximation, thereby freeing the magnetic field to diffuse with respect to the bulk velocity field. As a consequence, however, the induction equation can become problematic to solve via standard explicit techniques. In particular, the Hall diffusion term admits fast-moving whistler waves which can impose a vanishing time-step limit.Within an explicit differencing framework, a multifluid scheme for weakly ionized plasmas is presented which relies upon a new approach to integrating the induction equation efficiently. The first component of this approach is a relatively unknown method of accelerating …
Inverse Scattering Transform For The Camassa-Holm Equation, Adrian Constantin, Vladimir Gerdjikov, Rossen Ivanov
Inverse Scattering Transform For The Camassa-Holm Equation, Adrian Constantin, Vladimir Gerdjikov, Rossen Ivanov
Articles
An Inverse Scattering Method is developed for the Camassa-Holm equation. As an illustration of our approach the solutions corresponding to the reflectionless potentials are constructed in terms of the scattering data. The main difference with respect to the standard Inverse Scattering Transform lies in the fact that we have a weighted spectral problem. We therefore have to develop different asymptotic expansions.
Including Embodied Energy Considerations At The Conceptual Stage Of Building Design, Y. Yohanis, Brian Norton
Including Embodied Energy Considerations At The Conceptual Stage Of Building Design, Y. Yohanis, Brian Norton
Articles
Elevated operating temperatures reduce the solar to electrical conversion efficiency of building integrated photovoltaic devices (BIPV). Phase change materials (PCM) can be used to passively limit this temperature rise although their effectiveness is limited by their low thermal conductivities and by crystallization segregation during solidification. This paper presents an experimental evaluation of the effects of convection and crystalline segregation in a PCM as a function of efficiency of heat transfer within the finned PV/PCM system. The thermal performances of bulk PCM with crystallization segregation for different internal fin arrangements are presented. It is noted that the addition of internal fins …
Shifted 2d Non-Negative Tensor Factorisation, Derry Fitzgerald, Matt Cranitch, Eugene Coyle
Shifted 2d Non-Negative Tensor Factorisation, Derry Fitzgerald, Matt Cranitch, Eugene Coyle
Conference papers
Recently, non-negative matrix factor 2D deconvolution was developed as a means of separating harmonic instruments from single channel mixtures. This technique uses a model which is convolutive in both time and frequency, and so can capture instruments which have both time-varying spectra and time varying fundamental frequencies simultaneously. However, in many cases two or more channels are available, in which case it would be advantageous to have a multi-channel version of the algorithm. To this end, a shifted 2D Non-negative Factorisation algorithm is derived, which extends Non-negative Matrix Factor 2D Deconvolution to the multi-channel case. The use of this algorithm …
Development Of A Micro-Shot Peening Process And Testing Of Micro-Shot Peened Engineering Materials, James Vahey
Development Of A Micro-Shot Peening Process And Testing Of Micro-Shot Peened Engineering Materials, James Vahey
Masters
A precision, air blast, shot peening machine was designed and developed and used to carry out peening operations on engineering materials and components. The machine was designed to allow all the variables of the peening process to be controlled and adjusted. The micro-shot peening process was applied to a series of standard High Speed Steel twist drills, carbide inserts for milling cutters, turning tools and EPDM material. The drills were used under controlled CNC conditions to machine mild steel plates. The useful cutting life of the drills was monitored. The surface finish and the dimensional accuracy of the holes were …
Samats : Semi-Automated Modelling And Texturing System, Joe Hegarty
Samats : Semi-Automated Modelling And Texturing System, Joe Hegarty
Masters
The creation of detailed 3D (three-dimensional) building models has become an area of considerable research over the last couple of decades. The accurate modelling of buildings offers LBS (Location Based Services) applications in planning, cultural heritage, tourism and e-commerce among others. The approach taken by the majority of contemporary modelling systems that use terrestrial imagery taken from arbitrary locations requires the user to carry out manual correspondences across the image set. These correspondences are used for two purposes. Firstly, the correspondences are used to determine the exterior orientation parameters (position and orientation) of the cameras used to capture each image. …
Ber Variation In An Uwb Ofdm Mimo Communications System Based On Measurements Made In A Picocell Wireless Environment, Conor Downing, Pat Chambers, Hussein Baher
Ber Variation In An Uwb Ofdm Mimo Communications System Based On Measurements Made In A Picocell Wireless Environment, Conor Downing, Pat Chambers, Hussein Baher
Conference papers
A picocell UWB MIMO communications system model is considered which has five orthogonal sub-channels, each with its own OFDM signal. The effect of removing the various channel impulse response components which arise due to the multi-path propogation, a phenomenon characteristic of wide band transmission, is considered. This is a measurement based analysis where the measurements, themselves, were made, in a specially constructed enclosure which had reflective surfaces, using specially designed UWB antennas.
Design Of A Wide-Band Printed Antenna Using A Genetic Algorithm On An Array Of Overlapping Sub-Patches, Matthias John, Max Ammann
Design Of A Wide-Band Printed Antenna Using A Genetic Algorithm On An Array Of Overlapping Sub-Patches, Matthias John, Max Ammann
Conference papers
No abstract provided.
Photopolymer Diffractive Optical Elements In Electronic Speckle Pattern Shearing Interferometry, Emilia Mihaylova, Izabela Naydenova, Barry Duignan, Suzanne Martin, Vincent Toal
Photopolymer Diffractive Optical Elements In Electronic Speckle Pattern Shearing Interferometry, Emilia Mihaylova, Izabela Naydenova, Barry Duignan, Suzanne Martin, Vincent Toal
Articles
In this paper we present an electronic speckle pattern shearing interferometer using a photopolymer diffractive optical element in the form of a holographic grating, in combination with a ground glass to shear the images. The sheared images on the ground glass are further imaged onto a CCD camera. The distance between the grating and the ground glass can be used to control the shear and to vary the sensitivity of the system. The direction of sensitivity is easily controlled by rotation of the diffraction grating around its normal. Introducing photopolymer holographic gratings in ESPSI gives the advantage of using high …
An Approach To Teaching Pid Controller Tuning, Aidan O'Dwyer
An Approach To Teaching Pid Controller Tuning, Aidan O'Dwyer
Conference papers
This paper discusses an approach to the teaching of PID controller tuning methods to students in control engineering at Dublin Institute of Technology. The method involves analytically calculating the gain margin, phase margin and maximum sensitivity for PI and PID controlled systems whose process is modelled in first order lag plus time delay (FOLPD) form. Students can examine the performance of many tuning rules from graphical results, allowing insight to be developed as to the most rational choice of the tuning rule for the application. Some preliminary work done to develop an expert system to allow a greater automation of …
A Case Study In Modeling And Process Control: The Control Of A Pilot Scale Heating And Ventilation System, Robin Mooney, Aidan O'Dwyer
A Case Study In Modeling And Process Control: The Control Of A Pilot Scale Heating And Ventilation System, Robin Mooney, Aidan O'Dwyer
Conference papers
This paper details the control of a pilot scale laboratory heating and ventilation system. The system is represented in 2x2 multi-input, multi-output (MIMO) form. A process reaction curve identification technique was used to model (in first order lag plus delay - FOLPD - form) the flow process and temperature process portions of the system, over a range of operating conditions. Tests revealed that both processes were continuously non-linear. A gain scheduler with static decoupling was designed, using look-up tables, to continuously interpolate for the most suitable proportional-integral (PI) or proportional-integral-derivative (PID) controller settings and decoupler gains. The contribution of this …
Pi And Pid Controller Tuning Rules: An Overview And Personal Perspective, Aidan O'Dwyer
Pi And Pid Controller Tuning Rules: An Overview And Personal Perspective, Aidan O'Dwyer
Conference papers
The ability of PI and PID controllers to compensate many practical processes has led to their wide acceptance in industrial applications. The requirement to choose two or three controller parameters is most easily done using tuning rules. Starting with a general discussion of industrial practice, the paper provides a survey of additional tuning rules for continuous-time PI and PID control of time-delayed single-input, single-output (SISO) processes, to those explored in a recent book by the author.
Reducing Energy Costs By Optimizing Controller Tuning, Aidan O'Dwyer
Reducing Energy Costs By Optimizing Controller Tuning, Aidan O'Dwyer
Conference papers
The proportional integral derivative (PID) controller is the most dominant form of automatic controller in industrial use today. With this technique, it is necessary to adjust the controller parameters according to the nature of the process. This tailoring of controller to process is known as controller tuning. Controller tuning is easily and effectively performed using tuning rules (i.e. formulae for controller tuning, based on process information). Such tuning rules allow the easy set up of controllers to achieve optimum performance at commissioning. Importantly, they allow ease of re-commissioning if the characteristics of the process change. The paper outlines the results …
A Wavelet Controller For Shunt Active Power Filter, Malabika Basu, Biswajit Basu
A Wavelet Controller For Shunt Active Power Filter, Malabika Basu, Biswajit Basu
Conference papers
A wavelet-based controller for shunt active power filter (APF) has been proposed in this paper. The constructed controller based on multi resolution analysis has the advantage of better frequency bandwidth selection. The tuning parameters of the controllers are the gains to be applied to the time-frequency signals at different resolutions. This has the advantage of aiding the process of a proper choice of coefficients of tuning parameters. The developed simulation model of the APF with wavelet-based control shows satisfactory steady state and dynamic performance. A comparison with standard PI controller shows that the dynamic response of the proposed wavelet controller …
Optimising The Rating Of The Upqc For Applying To The Fault Ride Through Enhancement Of Wind Generation, N. G. Jayanti, Malabika Basu, Michael Conlon, Kevin Gaughan
Optimising The Rating Of The Upqc For Applying To The Fault Ride Through Enhancement Of Wind Generation, N. G. Jayanti, Malabika Basu, Michael Conlon, Kevin Gaughan
Conference papers
The unified power quality conditioner (UPQC) is a combination of a shunt and a series compensator cascaded via a DC link capacitor which works on the combined principle of active filtering and dynamic voltage restoration. Therefore, the UPQC can be a potential solution to the grid integration problems associated with fixed speed wind generators including reactive power compensation and fault ride through capability. The hardware design of the UPQC can be made more cost effective by proper selection of the rating of the individual compensators of the UPQC. It is shown in the paper that the application of a fixed …
Thermal Sprayed Surface Coatings And Optical Characterisation, Yueqiang Xue
Thermal Sprayed Surface Coatings And Optical Characterisation, Yueqiang Xue
Masters
This research work aims to establish the potential of defect detection of thermal sprayed surface coatings by using a newly developed optical non-destructive interferometric technique – Electronic Speckle Pattern Shearing Interferometry (ESPSI), rather than using mechanical destructive testing methods and other non-destructive methods. This technique has been used in many industries for non-destructive testing (NDT). However, it is innovative to use this technique for NDT of thermal sprayed metal alloy coatings, especially those that are produced by flame powder spraying process. Investigations were carried out by the SUPERJET spray process, which was the flame powder spray process utilised in this …
Effect Of Calcium Lactate And Heat-Shock On Texture In Fresh-Cut Lettuce During Storage, Ana Belen Martin-Diana, Daniel Rico, Jesus Maria Frias, Gary Henehan, Jemina Mulcahy, J. Barat, Catherine Barry-Ryan
Effect Of Calcium Lactate And Heat-Shock On Texture In Fresh-Cut Lettuce During Storage, Ana Belen Martin-Diana, Daniel Rico, Jesus Maria Frias, Gary Henehan, Jemina Mulcahy, J. Barat, Catherine Barry-Ryan
Articles
Textural and microstructural changes in fresh-cut lettuce were analysed over 12 days storage. The vegetable was treated with 120 ppm chlorine and with 15 g/L calcium lactate at room temperature (18–20 °C) and at 50 °C (heat-shock). Texturometer analysis showed that samples washed with calcium lactate had significantly (p > 0.05) higher crispness values than samples washed with chlorine. However the use of 50 °C treatment (heat-shock) gave better textural properties at the end of storage and significantly retarded the softening process, being in agreement with the sensorial results. Cryo-SEM micrographs showed a loss of turgor (shrinkage) of the tissue cells …
Horseradish And Soybean Peroxidases: Comparable Tools For Alternative Niches?, Barry Ryan, CiaráN Fagan, Neil Carolan
Horseradish And Soybean Peroxidases: Comparable Tools For Alternative Niches?, Barry Ryan, CiaráN Fagan, Neil Carolan
Articles
Horseradish and soybean peroxidases (HRP and SBP, respectively) are useful biotechnological tools. HRP is often termed the classical plant heme peroxidase, and although it has been studied for decades our understanding has deepened since its cloning and subsequent expression, which has enabled numerous mutational and protein engineering studies. SBP, however, has been neglected until recently; despite offering a real alternative to HRP that actually outperforms it in terms of stability. SBP is now used in numerous biotechnological applications, including biosensors. Review of both is timely. This article summarises and discusses the main insights into the structure and mechanism of HRP, …