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Displaying Results 1 - 13 of 13 on page 1 of 1
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Calculation of the Electronic and Optical Properties of Nanoscale Systems
(2011)
Haycock, Barry
Calculation of the Electronic and Optical Properties of Nanoscale Systems
(2011)
Haycock, Barry
Abstract:
At the nanometer length scale, the size of surface features in crystalline semiconductor systems is of the same order as the electron wavelength. This can result in unusual behaviour in the systems electronic, magnetic and optical properties due to electron confinement effects. Such effects can have practical and commercial applications and are currently the subject of considerable study in the disciplines of theoretical, computational and materials technology within nanoscience. This thesis uses molecular dynamics computational methods to examine such effects in the electronic structure of semiconductor-based crystalline systems. Three unique surfaces were studied in detail - the SiC(111) surface, the SiC(100) surface, and the prototypical In-Si(111) surface. Silicon carbide is of importance in the development of semiconductor technologies due to its physical robustness and relatively high power capabilities. An understanding of surface metallisation in semiconductors is of paramou...
https://arrow.dit.ie/sciendoc/105
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Design, Construction and Testing of a Portable Electronic Speckle Pattern Interferometry System for Contouring Applications
(2001)
Kneafsey, Tara J.
Design, Construction and Testing of a Portable Electronic Speckle Pattern Interferometry System for Contouring Applications
(2001)
Kneafsey, Tara J.
Abstract:
Optical surface metrology techniques offer many advantages over conventional methods. Some of these advantages include a greater sensitivity and a whole field analysis that is non-contract. They also offer greater lateral and vertical resolution and are not subject to electromagnetic influence. Despite these many advantages, there has been reluctance in industry to adopt these techniques. This reluctance can be attributed to the use of high-power lasers which are considered dangerous, the expense of the systems and complicated operation and analysis procedures. The objective of the research described in this thesis was to utilise recent developments in laser diodes, data acquisition techniques and software to develop a portable miniature system suitable for industrial use. The system described here has utilised different aspects of ESPI contouring design in the past, to produce a system, which has been optimised for industrial use. The system is stable, portable and robuse. The soft...
https://arrow.dit.ie/scienmas/2
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Development of a Quality of Service Framework for Multimedia Streaming Applications
(2010)
Wallace, Stuart
Development of a Quality of Service Framework for Multimedia Streaming Applications
(2010)
Wallace, Stuart
Abstract:
By the year 2012, it is expected that the majority of all Internet traffic will be video content. Coupled with this is the increasing availability of Wireless Local Area Networks (WLANs) due to their ease of deployment, flexibility and reducing roll out costs. Unfortunately the contention based access mechanism utilised by IEEE 802.11 WLANs does not suit the non-uniform or bursty bandwidth profile of a video stream which can lead to a reduced quality of service (QoS) being experienced by the end-user. In 2005, the IEEE 802.11e protocol was ratified in an attempt to solve this emerging problem. It provides for an access prioritization mechanism based upon four separate traffic classes or access categories (ACs). Each AC is characterised by a set of access parameters that determine its level of access priority which is turn determines the amount of bandwidth available to it. Computer simulation studies have shown that AC prioritisation can yield significant improvements in the QoS del...
https://arrow.dit.ie/engmas/38
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Electronic Customer Relationship Management (eCRM): Opportunities and Challenges in a Digital World
(2006)
Kennedy, Aileen
Electronic Customer Relationship Management (eCRM): Opportunities and Challenges in a Digital World
(2006)
Kennedy, Aileen
Abstract:
Electronic customer relationship management (eCRM) is seen to arise from the consolidation of traditional CRM with the e-business applications marketplace and has created a flurry of activity among companies. ECRM is the proverbial double-edge sword, presenting both opportunities and challenges for companies considering its adoption and implementation. This challenges companies considering its adoption and implementation. This paper explores the marketing opportunities eCRM creates for companies such as enhanced customer interactions and relationships as well as personalisation options, all of which are potential sources of competitive advantage. It also explores the challenges confronting companies implementing eCRM such as managing an on-line channel, date integration issues and information technology (IT) architecture challenges. Directions for future research are also suggested.
https://arrow.dit.ie/buschmarart/74
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Electronic Purchasing Consortia: a Future Procurement Direction
(2005)
Huber, Bernd; Sweeney, Edward; Smyth, Austin
Electronic Purchasing Consortia: a Future Procurement Direction
(2005)
Huber, Bernd; Sweeney, Edward; Smyth, Austin
https://arrow.dit.ie/nitlbk/19
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Electronic structure of lonsdaleite SixGe1−x alloys
(2020)
Broderick, Christopher A.
Electronic structure of lonsdaleite SixGe1−x alloys
(2020)
Broderick, Christopher A.
Abstract:
Conventional diamond-structured silicon (Si) and germanium (Ge) possess indirect fundamental band gaps, limiting their potential for applications in light-emitting devices. However, SixGe1-x alloys grown in the lonsdaleite ("hexagonal diamond") phase have recently emerged as a promising directgap, Si-compatible material system, with experimental measurements demonstrating strong room temperature photoluminescence. When grown in the lonsdaleite phase, Ge possesses a narrow (0:3 eV) "pseudo-direct"fundamental band gap. Lonsdaleite Si is indirect-gap (0:8 eV), creating the possibility to achieve direct-gap lonsdaleite SixGe1-x alloys across a Gerich composition range. We present a first principles analysis of the electronic and optical properties of lonsdaleite SixGe1-x alloys, elucidate the electronic structure evolution and direct-to indirect-gap transition, and describe the impact of alloy band mixing effects on inter-band optical transition strengths.
http://hdl.handle.net/10468/10752
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Exclusivity, Externalities & Easements: Dynamic Spectrum Access and Coasean Bargaining
(2007)
FORDE, TIM; DOYLE, LINDA
Exclusivity, Externalities & Easements: Dynamic Spectrum Access and Coasean Bargaining
(2007)
FORDE, TIM; DOYLE, LINDA
Abstract:
peer-reviewed
This paper explores the possibility of realising Coasean bargains to remove the presence of externalities in a libertarian system of exclusive spectrum rights through the creation of various economically motivated easements. We advocate that dynamic spectrum access (DSA) techniques can be used to enable rights holders reduce or eliminate the effects of externalities through local bargaining. Many of the objections to the promotion of marketbased exclusive-rights assignment systems concern the ability of rights holders to enforce their spectrum rights, so as to extract maximal value. In an increasingly fragmented and less-regulated spectrum landscape, there will be an inevitable chafing of rights at the boundaries between the users of neighbouring blocks of spectrum; the spectral activities of one network may impinge on the ability of a neighbouring network to extract maximum value from its exclusively assigned spectrum. Nonetheless, it is argued that it is possible...
http://hdl.handle.net/2262/19024
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Fabrication or Induction of Illness in a Child: a Critical Review of Labels and Literature Using Electronic Libraries
(2004)
Burns, Kenneth
Fabrication or Induction of Illness in a Child: a Critical Review of Labels and Literature Using Electronic Libraries
(2004)
Burns, Kenneth
Abstract:
This paper argues that the variance between professionals on the use of terminology to describe and define this form of child maltreatment may lead to a loss of focus on children's welfare. The author argues that the label Munchausen Syndrome by Proxy has outlived its use and recommends the adoption of a new label 'Fabrication or Induction of Illness in a Child'. The article presents a critical analysis of the titles of 41 0 unique library entries collated from electronic libraries to discern the prevalence of labels to denote the fabrication or induction of illness in children. The article also reviews recent developments in the UK courts and some critical observations on the challenges to the field. The author notes with concern that there does not appear to be a preponderance of service user narratives or critical perspectives in the literature. The adoption of a more critical orientation and the acknowledgement of critical service user narratives may be a useful f...
https://arrow.dit.ie/ijass/vol5/iss1/6
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Independent Strategies for the Future.
(1999)
Horan, Patrick; O'Connor, Peter
Independent Strategies for the Future.
(1999)
Horan, Patrick; O'Connor, Peter
Abstract:
What strategies should you be considering to drive business to your website? How should you invest you budget for independent technology initiatives? Learn how to evaluate different electronic distribution strategies, and how to reach the 'segment of one' by building new marketing strategies for GDS, the Internet, travel agents and tour operators.
https://arrow.dit.ie/tfschmtcon/22
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Realising Electronic Tendering in the Irish Construction Industry
(2007)
Hore, Alan V
Realising Electronic Tendering in the Irish Construction Industry
(2007)
Hore, Alan V
https://arrow.dit.ie/beschreccon/21
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The Electronic and Vibrational Spectroscopy of Metal Phthalocyanines and Metal Phthalocyanine Chlorides Isolated in Low Temperature Solids
(2016)
Henchy, Christopher
The Electronic and Vibrational Spectroscopy of Metal Phthalocyanines and Metal Phthalocyanine Chlorides Isolated in Low Temperature Solids
(2016)
Henchy, Christopher
Abstract:
Phthalocyanines (Pcs) are an important class of dye molecules, capable of incorporating a wide range of metal atoms into their macrocyclic cavity and can be heavily substituted on their outer carbons. These highly stable molecules play an important role not only in the commercial dye industry, but have also fuelled the development of many other technologies due to their attractive physical and chemical properties. Given their potential as light harvesting molecules, dye lasers and in photodynamic therapies, it is important to have a detailed understanding of the optical properties of the phthalocyanines. The matrixisolation technique provides an excellent opportunity to perform a detailed spectroscopic study of these molecules. Isolation of a molecule in an inert gas solid such as the rare gases or N2 at cryogenic temperatures allows for the acquisition of highly resolved spectra with very narrow bandwidths and the absence of hot bands or rotational bands. Furthermore, the positions...
http://mural.maynoothuniversity.ie/10419/
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Towards a fluid spectrum market for exclusive usage rights
(2007)
FORDE, TIM; Doyle, Linda
Towards a fluid spectrum market for exclusive usage rights
(2007)
FORDE, TIM; Doyle, Linda
Abstract:
This paper focuses on highly fluid markets for trading exclusive spectrum usage-rights. The purpose of the paper is to underline the need for flexible usage-rights policies, as a core facilitator of such markets as well as to stress the need for a greater technical input to the debate. The paper builds on current work in the field of spectrum property rights and exclusive usage-rights. The first half of the paper captures the current state-of-play and presents a framework for visualizing the concepts involved. The paper goes on to make a clear distinction between the defining of a set of exclusive usage-rights and the exercising of those rights. This leads to a discussion of policies that are not alone about defining metrics and setting their desired values but are also about behaviors that involve negotiation and interaction. Through-out the paper the evolution of technology and its affect on the progress towards the goal of fluid spectrum markets is emphasized, as is the need for ...
http://hdl.handle.net/2262/23959
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Two-dimensional materials and their role in emerging electronic and photonic devices
(2018)
O'Dwyer, Colm; Walsh, Lee A.; Gity, Farzan; Bhattacharjee, Shubhadeep; Hurley, Pau...
Two-dimensional materials and their role in emerging electronic and photonic devices
(2018)
O'Dwyer, Colm; Walsh, Lee A.; Gity, Farzan; Bhattacharjee, Shubhadeep; Hurley, Paul K.
Abstract:
Innovation in the field of semiconductor materials and devices have to a large extent underpinned the dramatic developments which have unfolded in the area of information and communication technologies over the past 50 years. The ability to form logic devices, memory elements, light emitting diodes, and lasers directly into semiconducting materials has had a transformative effect on modern society. Looking beyond the era of conventional scaling, the drive towards the internet of things, will require the integration of sensors and optical devices with conventional logic and memory elements. The aim of this article is to give a brief overview of the large-area growth of some 2D transition metal dichalcogenide layered materials by MBE and CVD methods, followed by examples of how these 2D materials can be employed in electron devices and optoelectronic structures and devices.
http://hdl.handle.net/10468/7225
Displaying Results 1 - 13 of 13 on page 1 of 1
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Dublin Institute of Technology (8)
Maynooth University (1)
Trinity College Dublin (2)
University College Cork (2)
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Conference item (5)
Doctoral thesis (1)
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Other (4)
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