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Subject = Shrinkage;
8 items found
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Displaying Results 1 - 8 of 8 on page 1 of 1
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A Technique for Characterization of Dimensional Changes in Slanted Holographic Gratings by Monitoring the Angular Selectivity Profile
(2008)
Pandey, Nitesh; Naydenova, Izabela; Martin, Suzanne; Toal, Vincent
A Technique for Characterization of Dimensional Changes in Slanted Holographic Gratings by Monitoring the Angular Selectivity Profile
(2008)
Pandey, Nitesh; Naydenova, Izabela; Martin, Suzanne; Toal, Vincent
Abstract:
A method has been developed for retrieving the complete angular selectivity profile of transmission holographic gratings in one step. The method is applied to study in real time the shrinkage and changes in the effective optical thickness of a slanted holographic grating recorded in an acrylamide-based photopolymer. It can form the basis of a holographic sensor of analytes that cause a thickness change in the holographic medium. It can also be useful for the study and optimization of holographic recording materials and for quality control during production of holographic optical elements.
https://arrow.dit.ie/cieoart/43
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Canning Tests on Mushroom Strain
(2015)
Gormley, T. R. (Thomas Ronan); MacCanna, C.
Canning Tests on Mushroom Strain
(2015)
Gormley, T. R. (Thomas Ronan); MacCanna, C.
Abstract:
Canning tests were carried out on 5 mushroom strains from 2 flushes of 4 separate crops. Particular attention was given to the ratio of whole closed canned mushrooms to that of whole closed canned mushrooms plus canned stems and pieces - i.e. total yield. Factors considered in the tests included grading prior to processing, blanching and retort losses, shrinkage in size and mushroom whiteness. Cream and off-white strains had the highest level of open and misshapen mushrooms prior to processing and a brown strain the lowest. Blanching losses, which comprised shrinkage and mushrooms that opened during blanching, ranged from 37.8% for the cream strain to 22.7% for the brown strain. Values for shrinkage during blanching were similar for the 5 strains with a mean of 19.2% loss in weight. Shrinkage during retorting ranged from 15.0% for the off-white-2 strain to 11.4% for the cream strain. Strains which showed a relatively low level of shrinkage during blanching had a relatively high shri...
http://hdl.handle.net/10197/6986
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Evaluating the structural capacity of concrete elements through in-situ instrumentation
(2013)
Byrne, David; Goggins, Jamie
Evaluating the structural capacity of concrete elements through in-situ instrumentation
(2013)
Byrne, David; Goggins, Jamie
Abstract:
The difficulty in predicting the long term load capacity of concrete elements is well documented. Time dependent effects such as creep and shrinkage coupled with varying loading events, particularly during construction, can all have an adverse effect on the long term performance of a concrete structure. This paper proposes a method that utilises in-situ instrumentation to predict the load carrying capacity of concrete members. During the construction of the Engineering building at the National University of Ireland, Galway over 260 sensors were embedded in a number of key concrete elements. The sensors are being continually monitored with the use of automatic datalogging equipment and the data is being used to monitor changes in geometric and material properties along with the subsequent time dependent deterioration of the elements. The paper will illustrate how the in-situ data from the demonstrator building can be used to estimate the real time behaviour of the concrete elements a...
http://www.ttp.net/978-3-03785-796-0.html
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Nanoparticle Doped Photopolymer with Reduced Shrinkage for Holographic Recording
(2010)
Moothanchery, Mohesh; Mintova, Svetlana; Naydenova, Izabela; Toal, Vincent
Nanoparticle Doped Photopolymer with Reduced Shrinkage for Holographic Recording
(2010)
Moothanchery, Mohesh; Mintova, Svetlana; Naydenova, Izabela; Toal, Vincent
Abstract:
We demonstrate holographic recording with Si-MFI zeolite doped acrylamide based photopolymerfilm. The influence of silicate nanoparticles on photopolymer shrinkage has been studied and compared withshrinkage in undoped photopolymer layers The shrinkage of the material (1.03%) is significantly lower forrecording in Si-MFI zeolite nanoparticle doped samples than for undoped layers (1.77%).
https://arrow.dit.ie/cieocon2/1
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Physical properties of magnesian lime mortars
(2018)
Chever, L.; Pavía, S.; Howard, R.
Physical properties of magnesian lime mortars
(2018)
Chever, L.; Pavía, S.; Howard, R.
Abstract:
Magnesian lime is made from dolomitic limestone. The properties of magnesian lime mortars are not yet clearly established: some authors claim that Mg-lime has no hydraulicity and produces poor quality mortars that fracture, while others state that it produces quality hydraulic mortars. Here, Mg-lime was produced by burning magnesium limestone in a traditional limekiln. Mortars were made with increasing proportions of Mg-lime and calcium lime (CL90), and tested according to both European and ASTM Standards, and RILEM recommendations. Shrinkage, compressive and flexural strengths, absorption, capillary suction, density and porosity were evaluated, and the relationships between workability (measured as initial flow), water demand and strength investigated. The process of lime production evidenced that fabrication parameters are instrumental on the quality of Mg-lime and the subsequent mortar's performance. Temperatures over 900A degrees C induced over-burning resulting in clinker ...
http://hdl.handle.net/10379/10770
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Real Time Shrinkage Studies in Photopolymer Films Using Holographic Interferometry
(2012)
Moothanchery, Mohesh; Naydenova, Izabela; Bavigadda, Viswanath; Martin, Suzanne; Toal, ...
Real Time Shrinkage Studies in Photopolymer Films Using Holographic Interferometry
(2012)
Moothanchery, Mohesh; Naydenova, Izabela; Bavigadda, Viswanath; Martin, Suzanne; Toal, Vincent
Abstract:
Polymerisation induced shrinkage is one of the main reasons why photopolymer materials are not more widely used for holographic applications. The aim of this study is to evaluate the shrinkage in an acrylamide photopolymer layer during holographic recording using holographic interferometry. Shrinkage in photopolymer layers can be measured by real time capture of holographic interferograms during holographic recording. Interferograms were captured using a CMOS camera at regular intervals. The optical path length change and hence the shrinkage were determined from the captured fringe patterns. It was observed that the photopolymer layer shrinkage is in the order of 3.5%.
https://arrow.dit.ie/cieocon2/33
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Shrink smarter? Planning for spatial selectivity in population growth in Ireland
(2013)
Daly, Gavin; Kitchin, Rob
Shrink smarter? Planning for spatial selectivity in population growth in Ireland
(2013)
Daly, Gavin; Kitchin, Rob
Abstract:
One of the most fundamental but overlooked questions in shaping a national territorial-development strategy is how to manage spatial development in regions that have not been selected for new growth. The Irish National Spatial Strategy (NSS) is ostensibly a policy exercise in spatial selectivity where clear choices have been made as to where to target future population growth. The failure of policy to implement the NSS to date can be largely attributed to the difficult political process in practice of identifying 'winners' and 'losers'. In order to achieve the public consensus required for effective implementation, a revised strategy will need to pay greater attention to the residual regions. This will require a greater societal acceptance that population growth cannot occur everywhere, and that population decline and stagnation may become the normal pathway for some regions. This paper explores planning governance models of how to manage decline, drawing on the ...
http://mural.maynoothuniversity.ie/4509/
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Study of an Acrylamide-based Photopolymer for use as a Holographic Data Storage Medium
(2005)
Sherif, Hosam; Naydenova, Izabela; Martin, Suzanne; McGinn, Colm; Berger, G; Denz, C; T...
Study of an Acrylamide-based Photopolymer for use as a Holographic Data Storage Medium
(2005)
Sherif, Hosam; Naydenova, Izabela; Martin, Suzanne; McGinn, Colm; Berger, G; Denz, C; Toal, Vincent
Abstract:
An acrylamide-based photopolymer formulated in the Centre for Industrial and Engineering Optics has been investigated with a view to further optimisation for holographic optical storage. Series of 15 to 30 gratings were angularly multiplexed in a volume of the photopolymer layers with different thickness at a spatial frequency of 1500 lines/mm. Since the photopolymer is a saturable material, an exposure scheduling method was used to exploit the entire dynamic range of the material and allow equal strength gratings to be recorded. From this investigation the photopolymer layer’s M/# was determined with regard to the recording geometry used. The temporal stability of photopolymer layers was studied in terms of diffraction efficiency and change of the reconstructed angle due to material shrinkage. In addition, the potential of the photopolymer as a holographic data storage medium was demonstrated by recording bit data-pages.
https://arrow.dit.ie/cieocon2/12
Displaying Results 1 - 8 of 8 on page 1 of 1
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Dublin Institute of Technology (4)
Maynooth University (1)
NUI Galway (2)
University College Dublin (1)
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