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Articles 781 - 810 of 1409
Full-Text Articles in Engineering
A Dual Band Lte Pifa Antenna For M2m Applications, Abraham Loutridis, Matthias John, Max Ammann
A Dual Band Lte Pifa Antenna For M2m Applications, Abraham Loutridis, Matthias John, Max Ammann
Articles
A dual Planar Inverted-F-Antenna for M2M applications, is proposed. The antenna covers the lower LTE band (690-960 MHz) and partially the upper LTE band (1670-2067 MHz). The antenna is low cost with omni-directional radiation characteristics. The measured total efficiency and gain are better than 58% and 0.8 dBi across the operational frequency range. A parametric study of key geometrical parameters is made.
A Clustering Approach To Domestic Electricity Load Profile Characterisation Using Smart Metering Data, Fintan Mcloughlin, Aidan Duffy, Michael Conlon
A Clustering Approach To Domestic Electricity Load Profile Characterisation Using Smart Metering Data, Fintan Mcloughlin, Aidan Duffy, Michael Conlon
Articles
The availability of increasing amounts of data to electricity utilities through the implementation of domestic smart metering campaigns has meant that traditional ways of analysing meter reading information such as descriptive statistics has become increasingly difficult. Key characteristic information to the data is often lost, particularly when averaging or aggregation processes are applied. Therefore, other methods of analysing data need to be used so that this information is not lost. One such method which lends itself to analysing large amounts of information is data mining. This allows for the data to be segmented before such aggregation processes are applied. Moreover, …
Lightening Strikes Twice For Dit Geomatics, Audrey Martin
Lightening Strikes Twice For Dit Geomatics, Audrey Martin
Articles
The Technological University Dublin (DIT) is rapidly becoming known as an international centre for excellence for all things geospatial. In September 2014, Kevin O'Mahony, a final-year BSc Geomatics student, won the international Trimble Geospatial Student Competition. Kevin is the second consecutive DIT student to win this prestigious award, following on from the success of David Hyland (BSc Geomatics) in 2012. Both students submitted their papers under the supervision of Dr Audrey Martin FSCSI FRICS, Chair of the recently accredited (by SCSI) DIT MSc in Geospatial Engineering. The worldwide student competition is held every two years and is open to all …
Medical Device Software And Technology: The Past, Present And Future, Martin Mchugh
Medical Device Software And Technology: The Past, Present And Future, Martin Mchugh
Articles
No abstract provided.
Risk Management In Motorway Ppp Projects: Empirical-Based Guidelines, Nunzia Carbonara, Nicola Costantino, Louis Gunnigan, Roberta Pellegrino
Risk Management In Motorway Ppp Projects: Empirical-Based Guidelines, Nunzia Carbonara, Nicola Costantino, Louis Gunnigan, Roberta Pellegrino
Articles
This paper deals with the topic of risk management in Public–Private Partnership (PPP). The analysis of the related literature reveals that risks must be analyzed and managed on a context-specific approach, and that there is a lack of a comprehensive study on the appropriate risk mitigation strategies for each risk embedded in PPP projects. Focusing on the transport sector, based on the results of a Delphi survey, the paper provides guidelines for both public and private parties in defining a list of significant risks in PPP motorway projects, and identifying for them both the effective allocation and the suitable mitigation …
Analysis And Characterization Of Finite-Size Curved Frequency Selective Surfaces, Francesco Mattiello, Giovanni Leone, Giuseppe Ruvio
Analysis And Characterization Of Finite-Size Curved Frequency Selective Surfaces, Francesco Mattiello, Giovanni Leone, Giuseppe Ruvio
Articles
Frequency Selective Surfaces (FSSs) are spatial filters that are largely employed in radomes for radars and antennas where high performance is necessary. FSS can be categorised in terms of their frequency behaviour. Band-pass FSS structures are able to let the electromagnetic wave pass in certain frequency ranges and shield others, which are especially suitable for out-of-band stealth of radomes. The properties of frequency selectiveness of these screens are used at microwave and infrared wavelengths. By tuning the electrical size and geometry of the unit-cell (patch or aperture) different frequency behaviours of the structure are generated. Although their analysis and simulation …
Integration Of Antenna Array With Multicrystalline Silicon Solar Cell, Oisin O'Conchubhair, Patrick Mcevoy, Max Ammann
Integration Of Antenna Array With Multicrystalline Silicon Solar Cell, Oisin O'Conchubhair, Patrick Mcevoy, Max Ammann
Articles
The integration of a low-profile antenna array with a multicrystalline silicon solar cell capable of powering a low-power wireless sensor at 2.45 GHz is reported. Lattice bus bars on the cell are exploited to minimize antenna shadows from low-profile antennas and transmission lines for a higher output power. The dual inverted-F array improves gain, and beam switching enables the array to sweep a wider coverage angle with larger beamwidths compared to other solar integrated antennas.
Assessing The Water Quality Response To An Alternative Sewage Disposal Strategy At Bathing Sites On The East Coast Of Ireland, Zeinab Bedri, John O'Sullivan, Louise Deering, Katalin Demeter, Bartholomew Masterson, Wim Meijer, Gregory O'Hare
Assessing The Water Quality Response To An Alternative Sewage Disposal Strategy At Bathing Sites On The East Coast Of Ireland, Zeinab Bedri, John O'Sullivan, Louise Deering, Katalin Demeter, Bartholomew Masterson, Wim Meijer, Gregory O'Hare
Articles
A three-dimensional model is used to assess the bathing water quality of Bray and Killiney bathing sites in Ireland following changes to the sewage management system. The model, firstly calibrated to hydrodynamic and water quality data from the period prior to the upgrade of the Wastewater Treatment Works (WwTW), was then used to simulate Escherichia coli (E. coli) distributions for discharge scenarios of the periods prior to and following the upgrade of the WwTW under dry and wet weather conditions. E. coli distributions under dry weather conditions demonstrate that the upgrade in the WwTW has remarkably improved the bathing water …
Dual Effects Of Β-Cyclodextrin-Stabilised Silver Nanoparticles: Enhanced Biofilm Inhibition And Reduced Cytotoxicity, Swarna Jaiswal
Dual Effects Of Β-Cyclodextrin-Stabilised Silver Nanoparticles: Enhanced Biofilm Inhibition And Reduced Cytotoxicity, Swarna Jaiswal
Articles
No abstract provided.
What Makes A Technology Appropriate?, Barrett Hazeltine
What Makes A Technology Appropriate?, Barrett Hazeltine
Articles
No abstract provided.
A Company Town, Daniel Peltz, Sheridan Coleman
Urban Eden, Anne Tate
Critical Design And The Critical Social Sciences, Damian White
Critical Design And The Critical Social Sciences, Damian White
Articles
No abstract provided.
Spatial Time-Dependent Reliability Analysis Of Reinforced Concrete Slab Bridges Subject To Realistic Traffic Loading, Donya Hajializadeh, Mark Stewart, Bernard Enright, Eugene J. Obrien
Spatial Time-Dependent Reliability Analysis Of Reinforced Concrete Slab Bridges Subject To Realistic Traffic Loading, Donya Hajializadeh, Mark Stewart, Bernard Enright, Eugene J. Obrien
Articles
Resistance and loads are often correlated in time and space. The paper assesses the influence of these correlations on structural reliability/probability of failure for a typical two-lane RC slab bridge under realistic traffic loading. Spatial variables for structural resistance are cover and concrete compressive strength, which in turn affect the strength and chloride-induced corrosion of RC elements. Random variables include pit depth and model error. Correlation of weights between trucks in adjacent lanes and inter-vehicle gaps are also included and are calibrated against Weigh-In-Motion (WIM) data. Reliability analysis of deteriorating bridges needs to incorporate uncertainties associated with parameters governing the …
Indoor Characterisation Of A Photovoltaic/ Thermal Phase Change Material System, Maria Browne, Keith Lawlor, Adam Kelly, Brian Norton, Sarah Mccormack
Indoor Characterisation Of A Photovoltaic/ Thermal Phase Change Material System, Maria Browne, Keith Lawlor, Adam Kelly, Brian Norton, Sarah Mccormack
Articles
Photovoltaic/ thermal (PV/T) systems integrate photovoltaic and solar thermal technologies and have the added advantage of producing both electrical and thermal energy simultaneously. This study has been carried out to investigate the performance of a PV/T phase change material (PCM) system under experimental climatic conditions. Electricity is generated by the PV during daylight hours and the heat produced is absorbed and stored in PCM. Water flows through a pipe network within the PCM and absorbs the stored heat in the PCM. In the PV/T-PCM system, water remained at a higher temperature for an extended period of time as well as …
Optical Microfibre Based Photonic Components And Their Applications In Label-Free Biosensing, Pengfei Wang, Lin Bo, Yuliya Semenova, Gerald Farrell, Gilberto Bramilla
Optical Microfibre Based Photonic Components And Their Applications In Label-Free Biosensing, Pengfei Wang, Lin Bo, Yuliya Semenova, Gerald Farrell, Gilberto Bramilla
Articles
Optical microfibre photonic components offer a variety of enabling properties, including large evanescent fields, flexibility, configurability, high confinement, robustness and compactness. These unique features have been exploited in a range of applications such as telecommunication, sensing, optical manipulation and high Q resonators. Optical microfibre biosensors, as a class of fibre optic biosensors which rely on small geometries to expose the evanescent field to interact with samples, have been widely investigated. Due to their unique properties, such as fast response, functionalization, strong confinement, configurability, flexibility, compact size, low cost, robustness, ease of miniaturization, large evanescent field and label-free operation, optical microfibres …
Identifying And Modelling Permit Trucks For Bridge Loading, Bernard Enright, Eugene J. Obrien, Cathal Leahy
Identifying And Modelling Permit Trucks For Bridge Loading, Bernard Enright, Eugene J. Obrien, Cathal Leahy
Articles
Accurate estimates of characteristic traffic load effects are essential in order to optimize bridge safety assessment. Permit trucks dominate the extreme upper tail of the truck loading distribution and as a result need careful examination. This paper proposes rules for filtering these trucks from Weigh-In-Motion data for both the US and Europe. The importance of these trucks in critical bridge loading events is then examined for both regions. A Monte Carlo traffic simulation model is developed which focuses on the accurate simulation of permit trucks.
Structural Properties Of Concrete Materials Containing Roadcem, Niall Holmes
Structural Properties Of Concrete Materials Containing Roadcem, Niall Holmes
Articles
This paper presents findings from a preliminary study to assess the structural and material properties of a nonstandard, concrete type mix containing RoadCem, a traditional soil stabilising additive. Two different mixes determined the effect of adding RoadCem in terms of compressive and flexural strengths, breaking strain, thermal expansion and contraction behaviour, permeability using a falling head, and Young’s modulus. RoadCem is a fine powder containing alkali metals and synthetic zeolites which are complemented with a complex activator. RoadCem modifies the dynamics and chemistry of cement hydration by enhancing the crystallisation process and forming longer needle crystalline structures. It reduces the …
A Review Of Probabilistic Methods Of Assessment Of Load Effects In Bridges, Eugene J. Obrien, F Schmidt, Donya Hajializadeh, X-Y Zhou, Bernard Enright, Colin C. Caprani, Simon Wilson, Emma Sheils
A Review Of Probabilistic Methods Of Assessment Of Load Effects In Bridges, Eugene J. Obrien, F Schmidt, Donya Hajializadeh, X-Y Zhou, Bernard Enright, Colin C. Caprani, Simon Wilson, Emma Sheils
Articles
This paper reviews a range of statistical approaches to illustrate the influence of data quality and quantity on the probabilistic modelling of traffic load effects. It also aims to demonstrate the importance of long-run simulations in calculating characteristic traffic load effects. The popular methods of Peaks Over Threshold and Generalized Extreme Value are considered but also other methods including the Box-Cox approach, fitting to a Normal distribution and the Rice formula. For these five methods, curves are fitted to the tails of the daily maximum data. Bayesian Updating and Predictive Likelihood are also assessed, which require the entire data for …
The Performance Of Concrete Exposed To Marine Environments: Predictive Modelling And Use Of Laboratory/On Site Test Methods, S.V. Nanukuttan, P.A.M. Basheer, W.J. Mccarter, L. Tang, Niall Holmes, T.M. Chrisp, G. Starrs
The Performance Of Concrete Exposed To Marine Environments: Predictive Modelling And Use Of Laboratory/On Site Test Methods, S.V. Nanukuttan, P.A.M. Basheer, W.J. Mccarter, L. Tang, Niall Holmes, T.M. Chrisp, G. Starrs
Articles
Premature deterioration of reinforced concrete structures due to lack of durability and subsequent poor state of their health, has led to a significant part of the construction budget being spent on repair and rehabilitation works. As a direct consequence, asset owners are often forced to take decisions to repair and maintain existing ailing infrastructure, as opposed to investing in new ones.
Cathodic Protection For Reinforced Concrete Structures: Present Practice And Moves Toward Using Renewable Energy, Aimee Byrne, Niall Holmes, Brian Norton
Cathodic Protection For Reinforced Concrete Structures: Present Practice And Moves Toward Using Renewable Energy, Aimee Byrne, Niall Holmes, Brian Norton
Articles
Abstract: Cathodic protection (CP) limits the corrosion of a metal by making it the cathode of an electrochemical cell. This is achieved either by (i) using more active sacrificial anodes to create a driving current, or (ii) using inert anodes and impressing an external direct current (DC). This paper presents up-to-date CP systems available for reinforced concrete, particularly Impressed Current Cathodic Protection (ICCP) and self-sufficient or renewable energy systems. The potential for overcoming the mismatch in energy provision from renewable sources (intermittent current) with energy needs for CP (constant current) is discussed by exploring novel designs and examining current requirments.
Matafunctional/Metafictional Objects, Paolo Cardini
Design For Transitions - From And To What?, Cameron Tonkinwise
Design For Transitions - From And To What?, Cameron Tonkinwise
Articles
No abstract provided.
On Creative Dialectics, Ian Gonsher
Lighting Design In Europe: Aligning The Demands For Lower Energy Usage With Better Quality., Kevin Kelly, James Duff
Lighting Design In Europe: Aligning The Demands For Lower Energy Usage With Better Quality., Kevin Kelly, James Duff
Articles
Lighting design is one of the fastest changing areas in building engineering. It has evolved significantly in recent years due to changing technology and demands for improved quality, better control, reduced energy and sustainability. This paper is an overview of what is happening in Europe and elsewhere and examines the literature to find that latest recommendations in the Code for Lighting issued by the SLL (Society of Light and Lighting) in the UK change previous demands for equal illuminance across a working plane to more specific and demanding criteria. There are recommendations for qualitative metrics and better distribution of light …
High Sensitivity Refractive Index Sensor Based On A Tapered Small Core Single-Mode Fiber Structure., Dejun Liu, Arun Mallik, Jinhui Yuan, Chongxiu Yu, Gerald Farrell, Yuliya Semenova, Qiang Wu
High Sensitivity Refractive Index Sensor Based On A Tapered Small Core Single-Mode Fiber Structure., Dejun Liu, Arun Mallik, Jinhui Yuan, Chongxiu Yu, Gerald Farrell, Yuliya Semenova, Qiang Wu
Articles
A high sensitivity refractive index (RI) sensor based on a tapered small core single-mode fiber (SCSMF) structure sandwiched between two traditional single-mode fibers (SMF28) is reported. The microheater brushing technique was employed to fabricate the tapered fiber structures with different waist diameters of 12.5, 15.0, and 18.8 μm. Experiments demonstrate that the fiber sensor with a waist diameter of 12.5 μm offers the best sensitivity of 19212.5 nm/RIU19212.5 nm/RIU (RI unit) in the RI range of 1.4304 to 1.4320. All sensors fabricated in this Letter show good linearity in terms of the spectral wavelength shift versus changes in RI. Furthermore, …
Topological Risk Mapping Of Runway Overruns: A Probabilistic Approach, Paolo Trucco, Massimiliano Ambroggi, Maria Chiara Leva
Topological Risk Mapping Of Runway Overruns: A Probabilistic Approach, Paolo Trucco, Massimiliano Ambroggi, Maria Chiara Leva
Articles
The paper presents a topological risk mapping for aircraft overruns. The proposed procedure is based on the study published in 2008 by Hall et al. (Analysis of aircraft overruns and undershoots for runway safety areas. Airport Cooperative Research Program. Washington, DC: Transportation Research Board; 2008). In that study the authors performed an analysis of aircraft overruns and undershoots for runway safety areas proposing the ACRP hazard probability model. In the present study the model was integrated into a two-step Monte Carlo simulation procedure to assess the risk of overrun accidents and to provide a topological risk map for a specific …
Effects Of Posttensioning Slippage On 2-Way Spanning Concrete Slabs, Niall Holmes, Eoin Byrne
Effects Of Posttensioning Slippage On 2-Way Spanning Concrete Slabs, Niall Holmes, Eoin Byrne
Articles
This paper investigates the effect of improper posttensioning of a 2-way spanning concrete slab subject to a central point load. Due to plate slippage alone, the support conditions only offered a 1-way spanning action which could have led to premature failure with dangerous consequences. Posttensioning can strengthen a flat slab against punching shear by controlling deflections and cracking under service loads compared with traditional punching shear reinforcing methods leading to more slender structures and economic solutions for longer spans. However, if the method is not properly applied, these thinner floor plates can fail in a brittle and sudden manner by …
Nonlinear Analysis Of Isotropic Slab Bridges Under Extreme Traffic Loading, Donya Hajializadeh, A. Salam Al-Sabah, Eugene J. Obrien, Debra F. Laefer, Bernard Enright
Nonlinear Analysis Of Isotropic Slab Bridges Under Extreme Traffic Loading, Donya Hajializadeh, A. Salam Al-Sabah, Eugene J. Obrien, Debra F. Laefer, Bernard Enright
Articles
Probabilistic analysis of traffic loading on a bridge traditionally involves an extrapolation from measured or simulated load effects to a characteristic maximum value. In recent years, Long Run Simulation, whereby thousands of years of traffic are simulated, has allowed researchers to gain new insights into the nature of the traffic scenarios that govern at the limit state. For example, mobile cranes and low-loaders, sometimes accompanied by a common articulated truck, have been shown to govern in most cases. In this paper, the extreme loading scenarios identified in the Long Run Simulation are applied to a non-linear, two-dimensional (2D) plate finite …
The Influence Of Particle Content On The Equi-Biaxial Fatigue Behaviour Of Magnetorheological Elastomers, Yanfen Zhou, Stephen Jerrams, Tony Betts, Gerald Farrell, Lin Chen
The Influence Of Particle Content On The Equi-Biaxial Fatigue Behaviour Of Magnetorheological Elastomers, Yanfen Zhou, Stephen Jerrams, Tony Betts, Gerald Farrell, Lin Chen
Articles
The equi-biaxial fatigue behaviour of silicone based magnetorheological elastomers (MREs) with various volume fractions of carbonyl iron particles ranging between 15% and 35% was studied. Wöhler curves for each material were derived by cycling test samples to failure over a range of stress amplitudes. Changes in complex modulus (E*) and dynamic stored energy during the fatigue process were observed. As for other elastic solids, fatigue resistance of MREs with different particle contents was shown to be dependent on the stress amplitudes applied. MREs with low particle content showed the highest fatigue life at high stress amplitudes while MREs with high …