Micro-strain mechanical measurements were taken from the manufactured scaffolds and the femoral head trabecular bone samples, and these results were compared to those obtained for the same structures form the FEA work. The visualisation tests were carried out in a transparent glass beaker. Such devices can allow pre-concentration of large volume of species and are relatively simple fabricated. The effects of fractions solid (fs) of the metal from 0.25 to 0.50 were also investigated. The application of these systems will be along the lines of the ‘lab-on-a-chip’ approach for biological diagnostic purposes. In this work six engineering and physical science laboratory experiments were developed to enhance the learning experience for students. However, SSM cast components tends to contain residual porosity, which is extremely detrimental to performance. Most of these technologies are not nominally currently capable of consistent production of pores sizes below 500µm. This project is concerned with one type of rapid prototyping technology, namely fused deposition modelling, which was initially commercialised in 1991. The graft was then washed using a pulsed lavage normal saline system over a sieve tower. Effect of the temporal thermal field on quality of semi-solid metal formed components. DCU - Digital Federal Credit Union - Come to us for a better deal on free checking, auto loans, mortgages, credit cards, savings, insurance, business banking, and more. Development of a laser based inspection system for surface defect detection, Mohammed Belal Hossain Bhuian (MEng 2002). Beginning in 2005, DCU for Kids began a partnership with the Boomer Esiason Foundation. Generic system development for marine environmental sensing, Design build and test a novel system for integration and deployment of emerging environmental sensor technologies. Dynamic accuracy of the system was measured at 2μm in the Z-axis (height) and at approximately 10μm in the X and Y axes. Recently, these MMCs with high ceramic contents have become another focus for thermal management applications in electronic packaging. Manufacturing parameters of temperature, pressure and material composition were varied to produce a range of balls. Their natural postural sway was measured using a foot pressure profile plate to determine how much deviation there was during testing. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. The high temperature capillary viscometer has been constructed and has been used for preliminary testing. Effect of Vibration on the Shear Strength of Impacted Bone Graft in Revision Hip Surgery. The ability of 3D Printing technology to fabricate tissue engineering scaffold geometries made of biocompatible calcium phosphate cements was also demonstrated in this work. A customized thermal fatigue system was used to investigate the effect of surface roughness on the modified surface fatigue properties. Previous work utilising Computer Based Learning (CBL) in similar projects relating to this work have been used to evaluate some of the benefits of virtual instrumentation, especially those relating to increased student interest, memory retention, understanding and ultimately performance in laboratory reports. In this research a novel approach of using a 2-dimensional planar microfluidic device is presented with an open 2D-plane space instead of conventional microchannel system. The presented work is an investigation of the laser surface modification of H13 tool steel using pulse laser processing mode. Development of a Laser Based Surface Profilometer Using the Principle of Optical Triangulation. It is also known that if the surface area of the solar cell can be increased, by micromachining for example that more power can be generated. The collected results were used to study the effect of the process parameters on the volumetric and mass ablation rates. This involves providing a comprehensive service to facilitate staff in their research activity. Over the last five years, two laser micro-machining processes which allow for the production of channels and voxels with repeatable micrometre level resolution have been developed within the Separation Science Cluster research group at Dublin City University. In terms of photovoltaic cells, the main problem is the lack of efficiency for harvesting the solar energy. RESEARCH CENTRES & GROUPS The cross-sectional shapes of the microchannels varied greatly between v-shape grooves, u-shaped groves and superficial ablated regions. The advantages of this new system may be seen as faster detection, lower cost, less bulky, greater resolution, and flexibility. Development of high-speed fibre-optical laser scanning system for defect recognition. Phase 1: Eighty bovine femoral heads were milled using the Noviomagus bone mill. Solid specimens were manufactured in order to measure the bulk compressive mechanical properties of the fabricated Calcium Phosphate Cement (CPC). Characterisation was undertaken using SEM, EDX, stylus roughness measurement and XRD analysis. The servomotors were used to move the sample in the X and Y directions with a resolution of 0.05 m. Experiments were carried out on different sample material surfaces: brass, aluminium and stainless steel. Whether funding support services, enrichment, and development activities, mentoring and education programs, medical research, providing scholarships, volunteering in the community, or sponsoring local events, find out what DCU is doing in the community. Analysis and Characterisation of the Strain Behaviour of Tissues and the Implications for Scaffold Design. Micro-Fluidic Chip Based Platforms for Liquid Chromatographic Separations. This device was used to produce Al-SiC composites. Laser system parameters investigated included power, P, pulse repetition frequency, PRF, number of pulses, N, and scanning speed, U. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Automated Control of Laser System for Micro-Machining. This may be explained by the process of liquefaction. The system was used to measure the dimensions of the surface defects, such as holes (1 mm), blind holes (2 mm) and notches in different materials. As detection and visualisation is a critical aspect of such species pre-concentration and identification systems. One of the main engineering problems that society faces in today’s world is that of sustainable energy supply. Advanced understanding gained of the operational procedure and software for the Nd:YVO4 system enabled change of the control unit into Compact-Rio Programmable Automation Controller (PAC), which is completed in LabVIEW code controlling in closed loop mode three dimensional positioning stages using high resolution encoders of sub-micron resolution. Superior mechanical properties are needed for numerous applications in semi-solid metal (SSM) formed components. Results from these models were compared to experimental results to validate the determined flow geometries and regions of increased concentration. The FDM machine builds the part by extruding semi-molten material through a heated nozzle in a prescribed pattern onto a platform. Despite a number of difficult measures taken by family business CEOs to ensure their company’s … This state of balance would be determined by measuring the subject’s postural sway. Strong correlations between these parameters and the resulting viscosity were noted for the power law viscosity equations which were used to develop the Fluent models. In particular, an integrated cooling coil design was shown to provide no improvement over the original design. This thesis deals with the design and development of a new high-speed photoelectronic system. The inspection system is based on the principle of optical triangulation and provides a non-contact method of determining 3D profile of a diffuse surface. As a result of sintering, the calcium phosphate cement decomposed to β-Tricalcium Phosphate (β-TCP) and Hydroxyapatite (HA) as confirmed by Thermogravimetric Analysis and Differential Thermal Analysis (TGA/DTA) as well as with X-Ray Diffraction (XRD). The effects of the time-temperature pre-processing route for required microstructure development will in particular be analyzed. The system is capable of measuring the thickness of solid, non-transparent objects using the principle of laser-optical triangulation. In this work the pore size, porosity level and loading methods have been shown to be strongly correlated with the stress levels experienced in the structures. Combining high power densities and reduced exposure time on metal processing induce surface microstructural changes. A 10 vol. On January 15 th, the School of Biotechnology hosted its 12 th Annual Research Day - albeit in a slightly different format to normal.. Over the last five years, two laser micro-machining processes which allow for the production of channels and voxels with repeatable micrometre level resolution have been developed within the Separation Science Cluster research group at Dublin City University. Microstructure voxels ranged from 48 to 181 µm in diameter. The computational simulation was performed with Fluent (CFD software) and an add on package MixSim. The metrology industry is constantly looking for new ways to accurately and quickly inspect and digitise surface topographies including the calculation of surface roughness parameters and generating point clouds (a collection of 3-dimensional points which describe a surface or surfaces) for modelling or reverse engineering purposes. We work closely with other DCU units which also support the research activity, such as Invent, HR, Finance, Graduate Studies, Library and ISS. Specifically, the fluid flow and heat transfer in the current pump cooling jacket was characterised. This project covers the development of a profilometer using the principle of optical triangulation. Conclusions: Civil engineering principles hold true for the impaction bone grafting procedure. This device will be used to measure the viscosity of semi-solid metals under high temperature and shear rate conditions, similar to those found in industry. A spatial resolution of approximately 70 µm and a depth resolution of 60 µm were achieved. The second model exhibited a reasonable representation of ball impact response that was universally applicable to all tested ball types; however, the accuracy in terms of predicting force-displacement response was not as high as required for broad range implementation. Corrosion testing within a 3.5% NaCl solution saturated with CO2 under deoxygenated condition at room temperature (20±2 ˚C), with pH of 4.0±0.3 was examined. Characterisation of the inspection system was also performed by measuring the accuracy of distances measured. The achieved results show that even though this system was used mainly for 2D scanning, it may also be operated as a limited 3D vision inspection system. The requirement for the pump manufacturing industry to move in this direction has increased recently with the introduction of new EU legislation making it a requirement that new higher efficiency levels are met across the industry. All students were assessed by report submission, multiple choice questions relating to their experiment and questionnaires. A minimum modified H13 average surface roughness, Ra, of 1.9 µm was achieved. What can DCU … % reinforced SiC particulate, similar to that used in the aluminium MMC's, was used in the visualisation and computational tests. These findings indicated the ability to design a strut architecture within which the stress levels can be varied to a larger degree at the strut surfaces such that cellular attachment and growth can be promoted. Measurement accuracies and repeatabilities to the micrometre level were achieved with the developed system. Anisotropy is important in considering the osteoconductivity of designed scaffolds. Research integrity is a key component in the induction of staff and research students, and presentations and resources are made available to the DCU research community via the Research Support section of the website. A surface temperature prediction model was also implemented to set the initial experimental process parameters. Inspection of the captured data was facilitated by creating a program to virtually present the 3D scanned surface and calculate requested surface roughness parameters. We encourage you to read and evaluate the privacy policy and level of security of any site you visit when you enter the site. Research Profiles Search ResultsresearchLorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. These were less prevalent in the HAZ. The developed numerical mode of the light propagation was successfully verified experimentally both in the aspect of the actual light path through the system and the intensity distribution giving results that may be interesting for the optimisation of photo-polymerisation systems as well as for the optical detection systems employing capillaries. Sintering resulted in significantly increased compressive properties (E = 9.15 MPa, σy = 0.483 MPa), but it decreased the specific surface area of the material. A significant part of the work consisted of the design, construction and validation of a specialised quick quench compocaster for this high temperature processing method. A reduction of crystallinity was noticeable for the modified H13 surface which was related to the more random distribution of crystallites after laser processing. DCU Business School Research Programmes are supported throughout the research programme. Our mission is to work with both external companies and our researchers to promote innovation, knowledge transfer and commercialisation of DCU innovations through … Looking at this drawback, there is now an opportunity for new materials to be developed, study and characterize in order to meet the prescribed requirements of thermally enhanced materials. This automated inspection facility has a X-Y scanning area capacity of 12 by 12 mm. This was achieved by instrumenting and creating virtual instruments for these experiments. The quality specifications for products and the materials used in them are becoming ever more demanding. This would be achieved by rapidly tilting the surface on which the person was standing and then returning it to the horizontal position. Overall the pore size was seen to be more important than the porosity level in determining the overall maximum stress level. PhD Student:  Syarifah Nur Aqida Binti Syed Ahmad (PhD 2011). Output dimensions measured included equivalent voxel diameter as well as microchannel width, depth and surface roughness. The work covered in this project had the aim of improving the electrical efficiency of a submersible pump. This commitment to world-class research is central to the new Research and Innovation Strategy, which sets out a range of specific actions to advance our reputation in that regard. However further post processing such as infiltration with biodegradable polymers may allow these structures to be used for scaffold applications. Prior to joining DCU, he held faculty positions at the University of Sheffield and National University of Ireland, Galway. This work will focus on applying the available micro-manufacturing facilities to develop surface and channel geometries that will provide enhanced separation and characterisation for biological systems. A 1.5kW pulsing CO2 laser is used to investigate the effects of varied laser process parameters and resulting surface microstructure and morphology. Aluminium, stainless steel, brass, copper, tufnol, and polycarbonate materials were all capable of being examined with the system. The porosity level however is also important in determining the osteoconductivity of the scaffold structure. The microchannel dimensions were studied in terms of the laser processing parameters using the response surface methodology (RSM) with the design of experiments technique (DOE). A 2D, two phase theoretical unsteady state model using a computational fluid dynamics (CFD) software FLUENT was developed. While we strive to only link you to companies and organizations that we feel offer useful information, DCU does not directly support … The aim of this work was to design, build and test a system that could perturb a test subject standing upon it in order to assess their ability to react to these changes. There was no change in concepts being between the two versions of the experiments; the only difference was in the methodology of presentation. The laser beam was incident obliquely to the sample surface. This work includes analysis of the dimensions and cost prediction modelling of Nd:YVO4 laser internal micro-channel fabrication in PMMA and internal laser processing of polycarbonate for the purpose of microfluidic device fabrication. CNGL offers a customer-responsive R&D resource, which can range from general consulting services, to early research and product and development, through to late-stage decision support. In this work, the important process of semi-solid metal forming will be investigated to provide improved quality parts. A core element of DCU’s vision is to be a globally-significant university that is renowned for its discovery and translation of knowledge to advance society. Mechanical properties were seen to depend on the designed pore shape (architecture), pore size (120, 340 and 600 µm) and loading conditions (with or without loading blocks). The primary aim of this study is to investigate the effects of rapid pulsed laser processing on the tribological properties of commercially available metallic biomaterials. In the visual and computer simulations, water and glycerol/water were used to represent liquid and semi-solid aluminium respectively. The dependence of particle dispersion times, settling times and vortex height on stirring geometry and stirrer speed was found. A vibration impaction device was developed which housed two 15V DC motors with eccentric weights attached inside a metal cylinder. Laser micromachining is commonly used for creating interconnects between active layers (for example glass substrate, hydrogenated silicon, and zinc oxide layers) in photovoltaic cells. Examination of these parameter variations on 8mm3, 22.7mm3 and 1000mm3 porous scaffolds were conducted to fully examine their influence on stress distribution. Recognising that virtual or hybrid internships may be preferable for many employers and students again this year, Prof David Collings, Director of DCU’s Leadership and Talent Institute, is leading a research project on effective virtual and hybrid internships with support from Deloitte. A control program was developed to automatically scan user selected part and surface areas. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Aluminium (Al) and Copper (Cu) reinforced by SiC is used in various industries due to its excellent thermo-physical properties such as low coefficient of thermal expansion (CTE), high thermal conductivity and improved mechanical properties such as higher specific strength, better wear resistance and specific modulus. The experimental and model results have suggested that the geometrical design of the structure plays a significant role in the stress distribution and highlights the great possibilities for scaffold design to enhance bone regeneration. The flow fields confirmed by CFD analysis allowed alternate designs to be tried, tested and compared for maintaining as low an operating temperature as possible. In conjunction with the  automated control of the plunger mechanism and the depositor position, accurate models were produced. Cells will be tested for energy produced under experimentally controlled levels of electromagnetic light exposure. The dynamic stiffness results demonstrated limited applicability of quasi-static testing and spring-theory equations. Generally, good agreement was found between the visualisation, computational and validation experimental results. The characteristics of the wax were also analysed in order to optimise the model production process. 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