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Full-Text Articles in Other Engineering

Level Of Service And The Transit Neighbourhood: Observations From Dublin City And Surburbs, David O'Connor, Brian Caulfield Jan 2019

Level Of Service And The Transit Neighbourhood: Observations From Dublin City And Surburbs, David O'Connor, Brian Caulfield

Articles

Few studies have looked at the impact Level-of-Service (LOS) might have on the distances people walk to public transport. The relationship, if any, has implications for transit-oriented-development and the viability of different transit modes serving suburban areas. This paper examines pedestrian catchment areas and LOS across a light rail, a metro rail and two bus corridors in Dublin. Public transport users have been surveyed at 17 stops around the city and their trip origin identified. Catchment areas for bus services with high levels of service were found to be comparable and often greater than those for LRT or metro rail ...


Serialised Holography For Brand Protection And Authentication, Dinesh Vather, Izabela Naydenova, Dervil Cody, Monika Zawadzka, Suzanne Martin, Emilia Mihaylova, Stephen Curran, Paul Duffy, Josune Portillo, Daniel Connell, Stephen Mcdonnell, Vincent Toal Aug 2018

Serialised Holography For Brand Protection And Authentication, Dinesh Vather, Izabela Naydenova, Dervil Cody, Monika Zawadzka, Suzanne Martin, Emilia Mihaylova, Stephen Curran, Paul Duffy, Josune Portillo, Daniel Connell, Stephen Mcdonnell, Vincent Toal

Articles

The problems presented by counterfeit products and documentation are discussed. Limitations of existing holograms for anti-counterfeit applications are described. We describe the advantages of full holographic serialisation and the requirements in terms of materials and techniques for mass production of true serialised holograms. These requirements having been met, we report for the first time the mass production of fully serialised holograms. The novelty of approach consists of the direct use of product manufacturer’s information as the object in a holographic recording system along with a self-processing photopolymer and modular optical system to facilitate mass production of truly serialised volume ...


Influence Of Atmospheric Clearness On Pdlc Switchable Glazing Transmission, Aritra Ghosh, Brian Norton, Tapas K. Mallick Jan 2018

Influence Of Atmospheric Clearness On Pdlc Switchable Glazing Transmission, Aritra Ghosh, Brian Norton, Tapas K. Mallick

Articles

Electrically activated switchable polymer dispersed liquid crystal (PDLC) is suitable for adaptive windows. A particular type requires 20V to become 71% transparent while in the absence of power it is 27% transparent. Glazing transmission changes with light incident angle. As the clearness of a sky changes the fraction changes alter of direct insolation (that has an azimuthally changing incident) and diffuse insolation (that has a largely constant incident). Thus, the effective overall incident angle determining the glazing transmittance also changes. In this work for the first time, the variation of PDLC glazing transmission with clearness index has been investigated.


Formative Assessment In Mathematics For Engineering Students, Eabhnat Ni Fhloinn, Michael Carr Jan 2017

Formative Assessment In Mathematics For Engineering Students, Eabhnat Ni Fhloinn, Michael Carr

Articles

this paper, we present a range of formative assessment types for engineering mathematics, including in-class exercises, homework, mock examination questions, table quizzes, presentations, critical analyses of statistical papers, peer-to-peer teaching, online assessments and electronic voting systems. We provide practical tips for the implementation of such assessments, with a particular focus on time or resource constraints and large class sizes, as well as effective methods of feedback. In addition, we consider the benefits of such formative assessments for students and staff.


Solar Dryers For Tropical Food Preservation: Thermophysics Of Crops, Systems And Components, Vivek Tomar, G. N. Tiwari, Brian Norton Jan 2017

Solar Dryers For Tropical Food Preservation: Thermophysics Of Crops, Systems And Components, Vivek Tomar, G. N. Tiwari, Brian Norton

Articles

Drying reduces the moisture content of harvested crops thus slowing decay processes to enable longerterm storage. Solar dryers contain the crop being dried, to enhance solar energy collection incurring lower crop losses than are associated with open-sun drying and recurrent costs than are inherent to uses of fossil-fuels for drying. The influences of key environmental, operational and design parameters for solar dryers are discussed including: (i) psychrometry of drying processes and ambient conditions, (ii) how initial crop properties are converted to final desired product attributes, (iii) feasibility of using powered components such as fans and (iv) air-heating solar collector selection.


Power-Weighted Divergences For Relative Attenuation And Delay Estimation, Ruairí De Fréin, Scott T. Rickard Prof Nov 2016

Power-Weighted Divergences For Relative Attenuation And Delay Estimation, Ruairí De Fréin, Scott T. Rickard Prof

Articles

Power-weighted estimators have recently been proposed for relative attenuation and delay estimation in blind source separation. Their provenance lies in the observation that speech is approximately windowed-disjoint orthogonal (WDO) in the time-frequency (TF) domain; it has been reported that using WDO, derived from TF representations of speech, improves mixing parameter estimation. We show that power-weighted relative attenuation and delay estimators can be derived from a particular case of a weighted Bregman divergence. We then propose a wider class of estimators, which we tune to give better parameter estimates for speech.


Book Reviews: Robert Hensey, First Light: The Origins Of Newgrange. Oxford: Oxbow Books, Series: Oxbow Insights In Archaeology, 2015, Frank Prendergast Jan 2016

Book Reviews: Robert Hensey, First Light: The Origins Of Newgrange. Oxford: Oxbow Books, Series: Oxbow Insights In Archaeology, 2015, Frank Prendergast

Articles

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Thermal Energy Storage In Building Integrated Thermal Systems: A Review. Part 2. Integration As Passive System, Dervilla Niall, Sarah Mccormack, Philip Griffiths, Luisa Cabeza, Lidia Navarro, Albert Castell, Alvaro De Grazia, Maria Brown Jul 2015

Thermal Energy Storage In Building Integrated Thermal Systems: A Review. Part 2. Integration As Passive System, Dervilla Niall, Sarah Mccormack, Philip Griffiths, Luisa Cabeza, Lidia Navarro, Albert Castell, Alvaro De Grazia, Maria Brown

Articles

Energy consumption trends in residential and commercial buildings show a significant increase in recent decades. One of the key points for reducing energy consumption in buildings is to decrease the energy demand. Buildings envelopes are not just a structure they also provide protection from outdoor weather conditions always taking into account the local climate. Thermal energy storage has been used and applied to the building structure by taking advantage of sensible heat storage of materials with high thermal mass. But in recent years, researchers have focused their studies on the implementation of latent heat storage materials that if well incorporated ...


Dit-Topcon Internship Experience, Audrey Martin, Abigail Iversen Jan 2015

Dit-Topcon Internship Experience, Audrey Martin, Abigail Iversen

Articles

The Dublin Institute of Technology (DIT: http://www.dit.ie/) is one of the largest Higher Education Institutes in Ireland, with 20,000 students registered and over 2000 members of staff. It has been providing technological higher education for over one hundred and twenty years encompassing the full spectrum of Third Level programmes. During that time the Institute's alumni have played important roles in technical and scientific innovation, economic and social development and culture and education both in Ireland and internationally.

The CEO of Topcon Positioning Systems Inc., Ray O’Connor is a DIT School of Surveying alumnus and ...


Phenomenology And Hermeneutic Phenomenology: The Philosophy, The Methodologies And Using Hermeneutic Phenomenology To Investigage Lecturers' Experiences Of Curriculum Design, Arthur Sloan, Brian Bowe Jan 2014

Phenomenology And Hermeneutic Phenomenology: The Philosophy, The Methodologies And Using Hermeneutic Phenomenology To Investigage Lecturers' Experiences Of Curriculum Design, Arthur Sloan, Brian Bowe

Articles

This article investigates the philosophy of phenomenology, continuing to examine and describe it as a methodology. There are different methods of phenomenology, divided by their different perspectives of what phenomenology is: largely grouped into the two types of descriptive and interpretive phenomenology. The focal methodology is hermeneutic phenomenology – one type of phenomenological methodology among interpretive phenomenological methodologies. The context for phenomenology and the location of hermeneutic phenomenology is explained through its historic antecedents. When using phenomenology as a methodology there are criteria for data gathering and data analysis and examples of these are cited in this paper. Also in this ...


Developing A Collaborative Virtual Learning Environment Between Students In Cross Disciplines In The Built Environment., Fiacra Mcdonnell, Ruairi Hayden Jun 2013

Developing A Collaborative Virtual Learning Environment Between Students In Cross Disciplines In The Built Environment., Fiacra Mcdonnell, Ruairi Hayden

Articles

Integrated Project Delivery is a rapidly developing approach to Design and Construction.This approach uses business structures, new technologies, and newly developing practices to collaboratively utilise the talents and contributions of all participants in the Design and Construction process.This project replicated this approach by creating a collaborative project between the School of Construction and the School of Real Estate and Construction Economics. The term “collaborative learning” refers to a method of delivery in which students at various performance levels work together in small groups towards a common goal. The students were responsible for one another’s learning as well ...


Professional Skills Portfolio For A Progressive Engineering Education, Dermot Mcgarthy, David Kennedy May 2013

Professional Skills Portfolio For A Progressive Engineering Education, Dermot Mcgarthy, David Kennedy

Articles

At the 2013 launch of the return to work scheme, “Springboard” in Dublin, it was stated that employers were seeking staff with enhanced language, presentation, communication, coping, and team-working skills. Graduates without these skills were finding it more difficult to gain permanent employment and were more likely to find themselves out of work unless they developed these skills. Enhancing personal development skills in education requires a revision of existing programmes. Not alone will these skills open new doors of opportunity for those who have lost their jobs during the recession, but should help sustain them going forward. The education of ...


Estimating The Wind Resource In An Urban Area: A Case Study Of Micro Wind Generation Potential In Dublin, Ireland, Keith Sunderland, Gerald Mills, Michael Conlon Apr 2013

Estimating The Wind Resource In An Urban Area: A Case Study Of Micro Wind Generation Potential In Dublin, Ireland, Keith Sunderland, Gerald Mills, Michael Conlon

Articles

The micro-turbine wind market in cities faces significant challenges due to the complexities associated with the urban terrain but, if a renewable solution to increasing energy demand is to be achieved, energy conversion systems where populations are concentrated, that is cities, must be considered. This research evaluates the urban wind resource by employing a physically-based empirical model to link wind observations at a conventional meteorological site to those acquired at urban sites. The approach is based on urban climate research that has examined the effects of varying surface roughness on the wind-field between and above buildings. Here, this is applied ...


Achieving A Holistic View Of The Life Cycle Performance Of Existing Dwellings, Albert Famuyibo, Aidan Duffy, P. Strachan Jan 2013

Achieving A Holistic View Of The Life Cycle Performance Of Existing Dwellings, Albert Famuyibo, Aidan Duffy, P. Strachan

Articles

Models which fully evaluate the life cycle energy and greenhouse gas (GHG) emissions of national housing stocks are not reported in literature. Capturing a holistic view of energy and emissions of the residential sector is an important process that can lead to a more effective policy making. This paper presents a methodology which evaluates the life cycle energy and GHG emissions of retrofitting housing stocks considering all life cycle stages and incorporating, to the greatest extent possible, all upstream inputs.

To achieve this, we developed a hybrid model of the existing Irish housing stock, comprising a process-based approach supplemented by ...


Analysis Of Wind Velocity And The Quantification Of Wind Turbulence In Rural And Urban Environments Using The Levy Index And Fractal Dimension, Jonathan Blackledge, Eugene Coyle, Niall Mccoy, Derek Kearney, Keith Sunderland, Thomas Woolmington Jan 2012

Analysis Of Wind Velocity And The Quantification Of Wind Turbulence In Rural And Urban Environments Using The Levy Index And Fractal Dimension, Jonathan Blackledge, Eugene Coyle, Niall Mccoy, Derek Kearney, Keith Sunderland, Thomas Woolmington

Articles

This paper is concerned with a quantitative and comparative analysis of wind velocities in urban and rural environments. It is undertaken to provide a route to the classification of wind energy in a rural and urban setting. This is a common problem and the basis of a significant focus of research into wind energy. In this paper, we use a non-Gaussian statistical model to undertake this task, and, through a further modification of the data analysis algorithms used, extend the model to study the effect of wind turbulence, thereby introducing a new metric for this effect that is arguably superior ...


Natural Convection In An Internally Finned Phase Change Material Heat Sink For The Thermal Management Of Photovoltaics, M. J. Huang, P. C. Eames, Brian Norton, N. J. Hewitt Jan 2011

Natural Convection In An Internally Finned Phase Change Material Heat Sink For The Thermal Management Of Photovoltaics, M. J. Huang, P. C. Eames, Brian Norton, N. J. Hewitt

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 ...


Tempo Detection Using A Hybrid Multi-Band Approach, Mikel Gainza, Eugene Coyle Jan 2011

Tempo Detection Using A Hybrid Multi-Band Approach, Mikel Gainza, Eugene Coyle

Articles

In this paper, a novel tempo detection system is presented, which suggests the use of a hybrid multiband decomposition. The model tracks the periodicities of different signal property changes that manifest within different frequency bands by using the most appropriate onset/transient detectors for each frequency band. In addition, the proposed system applies a novel method to weight tempo candidates. Each contribution is evaluated by comparing the presented system against existing approaches using three different databases that comprises 1638 songs. These databases include the two publicly available database of songs used in the tempo evaluation contest of ISMIR 2004. These ...


Validated Real-Time Energy Models For Small-Scale Grid-Connected Pv-Systems, Lacour Ayompe, Aidan Duffy, Sarah Mccormack, Michael Conlon Jul 2010

Validated Real-Time Energy Models For Small-Scale Grid-Connected Pv-Systems, Lacour Ayompe, Aidan Duffy, Sarah Mccormack, Michael Conlon

Articles

This paper presents validated real-time energy models for small-scale grid-connected PV-systems suitable for domestic application. The models were used to predict real-time AC power output from a PV system in Dublin, Ireland using 30-min intervals of measured performance data between April 2009 and March 2010. Statistical analysis of the predicted results and measured data highlight possible sources of errors and the limitations and/or adequacy of existing models, to describe the temperature and efficiency of PV-cells and consequently, the accuracy of power prediction models. PV-system AC output power predictions using empirical models for PV-cell temperature and efficiency prediction showed lower ...


An Intriguing Monument, Muiris O'Sullivan, Frank Prendergast, Geraldine Stout Mar 2010

An Intriguing Monument, Muiris O'Sullivan, Frank Prendergast, Geraldine Stout

Articles

No abstract provided.


There's More To Planning Than Coloured Maps, Lorcan Sirr Jan 2010

There's More To Planning Than Coloured Maps, Lorcan Sirr

Articles

No abstract provided.


Broadening Ethics Teaching In Engineering: Beyond The Individualistic Approach, Eddie Conlon, H. Zandvoort Jan 2010

Broadening Ethics Teaching In Engineering: Beyond The Individualistic Approach, Eddie Conlon, H. Zandvoort

Articles

There is a widespread approach to the teaching of ethics to engineering students in which the exclusive focus is on engineers as individual agents and the broader context in which they do their work is ignored. Although this approach has frequently been criticised in the literature, it persists on a wide scale, as can be inferred from accounts in the educational literature and from the contents of widely used textbooks in engineering ethics. In this contribution we intend to: (1) Restate why the individualistic approach to the teaching of ethics to engineering students is inadequate in view of preparing them ...


Microwave-Assisted Synthesis Of Zno Micro-Javelins, Suresh Pillai, Declan Mccormack, John M. Kelly, Sibu C. Padmanabhan Nov 2009

Microwave-Assisted Synthesis Of Zno Micro-Javelins, Suresh Pillai, Declan Mccormack, John M. Kelly, Sibu C. Padmanabhan

Articles

The microwave (MW)-assisted formation of ZnO micro-javelins from zinc nitrate and urea in aqueous solution is described. The particles (named as ‘micro-javelins’ because of their high aspect ratio and needle-like tips) grow hexagonally with well-defined facets in the h0110i direction and pointed tips in (0001) direction. Powder X-ray diffraction patterns show the appearance of a strikingly dominant (1000) orientation. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) investigations reveal the morphological evolution of these hexagonal ZnO particles with time. The effect of precursor concentrations, counterion type andMWirradiation power and their consequent influence on pH and Zn2+ ion concentration ...


The New Engineer: Between Employability And Social Responsibility, Eddie Conlon Jan 2008

The New Engineer: Between Employability And Social Responsibility, Eddie Conlon

Articles

The reasons behind the demand for what is sometimes called the New Engineer are critically examined and it is argued that a focus on employability alone is not sufficient to prepare socially responsible engineers. By examining issues around work organisation and sustainability it is proposed that engineers need to understand the wider social context in which they work. It is argued that the focus of ethics education should be broadened to focus on the social structure and the way it both enables and constrains socially responsible conduct. There is a call to refocus engineers’ attitudes towards the systems of regulation ...


Extended Nonnegative Tensor Factorisation Models For Musical Sound Source Separation, Derry Fitzgerald, Matt Cranitch, Eugene Coyle Jan 2008

Extended Nonnegative Tensor Factorisation Models For Musical Sound Source Separation, Derry Fitzgerald, Matt Cranitch, Eugene Coyle

Articles

Recently, shift-invariant tensor factorisation algorithms have been proposed for the purposes of sound souce separation of pitched musical instruments. However, in practice, existing alogorithsm require the use of log-frequency spectrograms to allow shift invariance in frequency which causes problems when attempting to resynthesise the separated sources. Further, it is difficult to impose harmonicity constraints on the recovered basis functions. This paper proposes a new additive synthesis-based approach which allows the use of linear-frequency spectrograms as well as imposing strict harmonic constraints, resulting in an improved model. Futher, these additional constraints allow the addition of a source filter model to the ...


Photopolymer Diffractive Optical Elements In Electronic Speckle Pattern Shearing Interferometry, Emilia Mihaylova, Izabela Naydenova, Barry Duignan, Suzanne Martin, Vincent Toal Jan 2006

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 ...


Holographic Patterning Of Acrylamide-Based Photopolymer Surface, Izabela Naydenova, Emilia Mihaylova, Suzanne Martin, Vincent Toal Jan 2005

Holographic Patterning Of Acrylamide-Based Photopolymer Surface, Izabela Naydenova, Emilia Mihaylova, Suzanne Martin, Vincent Toal

Articles

The patterning of an acrylamide-based photopolymer surface by holographic recording is studied. The patterns are induced by light alone and no post-processing is required. Periodic surface modulation is observed in addition to a volume phase grating. An investigation has been carried out using white light interferometry into the dependence of the amplitude of the photo induced surface relief modulation on the spatial frequency, intensity of recording and sample thickness. The observed dependencies indicate that the diffusion of material during the holographic recording plays a major role in surface relief formation. The possibility for inscription of surface relief patterns opens the ...


Ancient Astronomical Alignments: Fact Or Fiction?, Frank Prendergast Jan 2002

Ancient Astronomical Alignments: Fact Or Fiction?, Frank Prendergast

Articles

No abstract provided.