Use this number to send us... Loan authorization payment changes ; … Tight focusing was also achieved with this system using a microscope objective lens to produce smaller voxels ranging from 5 to 10 µm in soda-lime glass, fused silica and sapphire samples. This was achieved by instrumenting and creating virtual instruments for these experiments. This work will assess the unique thermo-physical properties of these MMCs as well as their possible application in electronic packaging thermal management needs. Stress distribution and pore size location affect the remodelling processes and different loading conditions may change the maximum stress values and its location. Phase 2: Graft impacted with the addition of vibration in a saturated aggregate displayed lower shear strengths for all normal compressive loads than that of impaction without vibration. The graft was then washed using a pulsed lavage normal saline system over a sieve tower. These were less prevalent in the HAZ. Design criteria included a requirement for a highly controllable temperature up to 800 ºC, injection shear rates above 10,000 s-1, and controllable injection profiles. During this project several different scaffold geometries were designed and Finite Element Analysis was carried out to understand the mechanical properties of bone structures, their role in tissue development, maximum stress and strain distribution in the scaffolds. Phase 2: Experiments were repeated with the addition of blood so as to replicate a saturated environment as is encountered during operative conditions. 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. However, SSM cast components tends to contain residual porosity, which is extremely detrimental to performance. The developed system was successfully used to generate automated 2D surface profiles, 3D surface profiles and surface roughness measurement on different sample material surfaces. Microstructure voxels ranged from 48 to 181 µm in diameter. Investigation of Semi-Solid Metal Processing Route. A new report from Dublin City University’s National Centre for Family Business shows that despite 83% of CEOs reporting their business to be negatively impacted by the COVID-19 pandemic, Irish family businesses have demonstrated resilience and a strong commitment to continuity.. Initial screening experimental designs conducted lead to more optimised detailed designs. Preliminary work has illustrated that novel capillary mixing and surface channel morphologies that can be generated with a view to enhancing separation capabilities. The dependence of particle dispersion times, settling times and vortex height on stirring geometry and stirrer speed was found. These parts should have reduced porosity and improved microstructural features including ultra-fine granularity and homogenous distribution of strengthening precipitates and alloy micro-elemental composition. As detection and visualisation is a critical aspect of such species pre-concentration and identification systems. He is a Fellow of the Academy of Social Sciences. Development of a Laser Based Surface Profilometer Using the Principle of Optical Triangulation. Laser micromachining is commonly used for creating interconnects between active layers (for example glass substrate, hydrogenated silicon, and zinc oxide layers) in photovoltaic cells. Having a research degree marks you out as someone with both specialist knowledges in your discipline and the ability and commitment to manage and complete a demanding and challenging piece of academic research. 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. These designs allowed prototypes to be built and tested as well as FEA of these structures to be performed. Vibration at sixty Hertz was displayed the largest effect and was found to be significant. The pore size of the scaffold is also important for the fabrication method. Analysis of ball deformation behaviour demonstrated that centre-of-mass displacement and diameter compression were not consistently equivalent for all ball types. The application of these systems will be along the lines of the ‘lab-on-a-chip’ approach for biological diagnostic purposes. As the laser beam interaction time increased, the surface roughness of the steel increased for the various pulse energy levels examined. 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. Examination of the Stir-Casting Method to Produce Al-SiC Composites. In this research results of newly developed simulations using COMSOL Multiphysics® 3.5a are presented. 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. 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. Testing of the system will be also discussed, including the limitations of the profilometer and possible improvements to the system. Effect of Vibration on the Shear Strength of Impacted Bone Graft in Revision Hip Surgery. The Mohr-Coulomb failure envelope from which the shear strength and interlocking values are derived was plotted for each test. Nano-level surface profile detail has been shown to influence the efficiency of solar cell energy absorption. Devices fabricated with this developed technology will be utilised in this project for micro-fluidic lab-on-a-chip applications. Moreover, a thermal mathematical model of the process was also developed in order to aid understanding of the process and to allow channel topology prediction a priory to actual fabrication. Significantly different electrochemical behaviour and corrosion rates have been found within the PM, WM and HAZ. The effects of viscosities of 1, 300, 500, 800 and 1000 mPas and stirring speeds of 50, 100, 150, 200, 250 and 300 rpm were investigated. Differences in surface height were then taken as a horizontal shift of the laser spot on the sample surface. Each shear test was then repeated at four different normal loads so as to generate a family of stress-strain curves. Our mission is to work with both external companies and our researchers to promote innovation, knowledge transfer and commercialisation of DCU innovations through … 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. Numerical models and experimental validation of light propagation and light intensity distribution in 2D microfluidic systems is presented. Maintaining well-established ethical standards is an important aspect of upholding the integrity of the research process. Software development for wireless data collection for road traffic monitoring, High Speed Laser Processing of Metallic Alloys for Biomedical Applications. In particular, the automation for the alser firing and sample positioning is controlled using FPGA. Improvement in the cooling jacket design would give better heat transfer in the motor region of the pump and hence result in a higher efficiency pump, with reduced induction resistance. Prior to joining DCU, he held faculty positions at the University of Sheffield and National University of Ireland, Galway. Computational Control of Laser Systems for Micro-Machining. This work is concentrated on the laser surface modification of AISI 316L stainless steel and Ti-6Al-4V. Membership-related faxes – 866.874.7820. 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. The position of the laser sensor above the target surface also has an adjustable range of 15 millimetres. This work concerns the electrohydrodynamic focusing (EHDF) and photon transmission to aid the development of species pre-concentration and identification. The School of Computing is a stimulating environment for research, particularly in the areas of localization, data analytics, software engineering, scientific computing and cloud computing. The characteristics of the wax were also analysed in order to optimise the model production process. While the structure of the surface was seen to retain a conventional crystal arrangement, grain orientation changes were observed in the laser processed region. Their natural postural sway was measured using a foot pressure profile plate to determine how much deviation there was during testing. 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. High-speed fibre optic laser scanning systems are being used in automated industrial manufacturing environments to determine surface defects. The use of virtual instrumentation is directly compared with traditional laboratory teaching techniques and pedagogical principles from which both methods have developed from are discussed. In this work, A high speed, low cost, and high accuracy non-contact laser scanning inspection system was developed. Products and the method of determining 3D profile of a laser based surface profilometer using the principle of optical and... 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