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Limited By:	Subject = Calculations;

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Displaying Results 1 - 5 of 5 on page 1 of 1

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A Project-Based Learning Approach to Applied Craft Calculations Within Apprenticeship Education: An Action Research Study (2010)

Furlong, Kevin

A Project-Based Learning Approach to Applied Craft Calculations Within Apprenticeship Education: An Action Research Study (2010)

Furlong, Kevin

Abstract:

Using an Action Research methodology, this study was based in Dublin Institute of Technology and conducted with the cooperation of three groups of Phase Six Plumbing apprentices over a ten-month period (three cycles). The main aim of the research project was to establish if a deeper understanding and application of Building Services Applied Calculations could be achieved through the implementation of Project-Based Learning within Apprenticeship Education? Research literature shows that not only in Ireland but also abroad, third level education is experiencing what is described as a ‘maths problem’. With applied calculations and mathematics being a fundamental and essential part of Building Services Engineering in general, and also the FÁS phase six plumbing curriculum, many students are failing module examinations because of an inadequate understanding of basic mathematical principles. The question was examined through the design, implementation and evaluation of real world plumbing...

https://arrow.dit.ie/ltcdis/14

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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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First principles static and dynamic calculations for the transition metal hydride series MH4L3 (M = Fe, Ru and Os; L = NH3, PH3 and PF3) (2015)

Sieffert, Nicolas; Kendrick, Thomas; Tiana, Davide; Morrison, Carole A.

First principles static and dynamic calculations for the transition metal hydride series MH4L3 (M = Fe, Ru and Os; L = NH3, PH3 and PF3) (2015)

Sieffert, Nicolas; Kendrick, Thomas; Tiana, Davide; Morrison, Carole A.

Abstract:

We present a first principles static and dynamical study of the transition metal hydride series MH4L3 (M = Fe, Ru and Os; L = NH3, PH3 and PF3), with a view to arriving at an understanding of how the variation in the electronic properties of the metal sites and ligands can influence the dynamics of the resulting complexes. A broad range of behaviour was observed, encompassing stable classical minima (M = Os, L = NH3 and M = Ru, L = PH3) to stable eta(2)-H-2 non-classical minima (M = Fe, L = PF3 and M = Ru, L = PH3 or PF3), with the other structures exhibiting dynamical behaviour that spontaneously converted between the classical and non-classical states during the molecular dynamics simulations. The importance of a small L-axial-M-L-axial angle in stabilising the non-classical state is highlighted, as is a short eta(2)-H-2 center dot center dot center dot H-cis distance in non-classical complexes that spontaneously convert to the classical form. We also investigated the changes in t...

http://hdl.handle.net/10468/6413

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Properties of homo- and hetero-Schottky junctions from first principle calculations (2018)

Greer, James C.; Blom, Anders; Ansari, Lida

Properties of homo- and hetero-Schottky junctions from first principle calculations (2018)

Greer, James C.; Blom, Anders; Ansari, Lida

Abstract:

Electronic structure calculations for a homo-material semimetal (thick Sn)/semiconductor (thin Sn) heterodimensional junction and two conventional metal (Ag or Pt)/silicon hetero-material junctions are performed. Charge distributions and local density of states are examined to compare the physics of junctions formed by quantum confinement in a homo-material, heterodimensional semimetal junction with that of conventional Schottky hetero-material junctions. Relative contributions to the Schottky barrier heights are described in terms of the interface dipoles arising due to charge transfer at the interface and the effects of metal induced gap states extending into the semiconducting regions. Although the importance of these physical mechanisms vary for the three junctions, a single framework describing the junction energetics captures the behaviors of both the heterodimensional semimetal junction and the more conventional metal/semiconductor junctions.

http://hdl.handle.net/10468/9658

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The 2012 SLL Code for Lighting: the Impact on Design and Commissioning (2012)

Duff, James Thomas

The 2012 SLL Code for Lighting: the Impact on Design and Commissioning (2012)

Duff, James Thomas

Abstract:

In March 2012, the Society of Light and Lighting (SLL) published a new edition of the Code for Lighting. This revision includes a number of changes, which are discussed in detail. Among these changes are a recommendation for mean cylindrical illuminance within enclosed spaces and increased room surface reflectances. A method has been proposed by others to perform in-field measurement of cylindrical illuminance without a dedicated meter. Research in a small test space is undertaken to validate this proposed methodology and comment on its accuracy and practicality. Using the same test space, room surface reflectances are altered to demonstrate their impact on the visual environment. The proposed method for recording cylindrical illuminance is found to be accurate, but tedious and time-consuming to implement. Room surface reflectances were increased and the effect on illuminance on surfaces, luminance, horizontal illuminance, cylindrical illuminance and modelling index was significant ...

https://arrow.dit.ie/sdar/vol1/iss2/4

Displaying Results 1 - 5 of 5 on page 1 of 1