The large difference in coefficient of thermal expansion (CTE) between the ceramic and Aluminium or Copper is a drawback, as it results in a less reliable package and also restricts the size of the ceramic substrate that can be attached to the baseplate. 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. We encourage you to read and evaluate the privacy policy and level of security of any site you visit when you enter the site. Development of a laser based inspection system for surface defect detection, Mohammed Belal Hossain Bhuian (MEng 2002). Basing on these simulations a novel ship shapes were investigated to provide optimal conditions for EHDF. He is a Fellow of the Academy of Social Sciences. The obtained mechanical properties are not sufficient for high load bearing implants, where the required strength in ranging between 1.5 -150 MPa and compressive stiffness is above 10 MPa. Electrohydrodynamic Focusing in 2 Dimensional Planar Microfluidic Devices for Pre-concentration of Low Abundance Analytes. DCU Business School is characterised by a vibrant research community and we provide unrivalled research support to postgraduate research students. About DCU. Numerical models and experimental validation of light propagation and light intensity distribution in 2D microfluidic systems is presented. A weight was dropped onto this from a set height 72 times so as to replicate the bone impaction process. The hexagonal structure presented, although examined in only one direction, would be the most anisotropic structure relative to the cubic and triangular based structures. The effects of the time-temperature pre-processing route for required microstructure development will in particular be analyzed. Numerical analysis was conducted to simulate the impact response of the ball using three mathematical models. A newly developed technique of using an angled array of fibres allowed an adjustable resolution to be obtained with the system, with a maximum system resolution of approximately 100 µm (the diameter of the collecting fibre). These scholarships will provide support for PhD study and are open to applicants who register in Year 1 of the full-time PhD programme in the Business School in DCU in September/October 2021. Dublin City University (abbreviated as DCU) (Irish: Ollscoil Chathair Bhaile Átha Cliath) is a university based on the Northside of Dublin, Ireland.Created as the National Institute for Higher Education, Dublin in 1975, it enrolled its first students in 1980, and was elevated to university status (along with the NIHE Limerick, now the University of Limerick) in September 1989 by … The pore size of the scaffold is also important for the fabrication method. 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). To date all of the rapid prototyping methods have certain limitations. This state of balance would be determined by measuring the subject’s postural sway. Despite a number of difficult measures taken by family business CEOs to ensure their company’s … The dominant loading direction should encourage pore sizes and distribution to allow cells growth into the larger pores as well as providing nutrients and building material. 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. 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 work, the important process of semi-solid metal forming will be investigated to provide improved quality parts. There was no change in concepts being between the two versions of the experiments; the only difference was in the methodology of presentation. The FDM machine builds the part by extruding semi-molten material through a heated nozzle in a prescribed pattern onto a platform. 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. Biography. In order to achieve these project goals, ANN and DoE dimensional measurement comparison and cost comparison with CO2 and Nd:YVO4 laser systems have been performed. The objective of this project was to develop and characterise a novel optical high-speed online surface defect detection system. 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. Microchannels dimensions varied greatly also with widths ranging from 81 to 365 µm, depths ranging from 3 to 379 µm and surface roughness between 2 to 13 µm being produced depending on the settings. A process mapping investigation was then carried out to determine a range of specific laser processing parameters that melt the surface of the steel. On January 15 th, the School of Biotechnology hosted its 12 th Annual Research Day - albeit in a slightly different format to normal.. 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.. Microstructure voxels ranged from 48 to 181 µm in diameter. Output dimensions measured included equivalent voxel diameter as well as microchannel width, depth and surface roughness. Phase 1: Eighty bovine femoral heads were milled using the Noviomagus bone mill. In this work, the use of the cooling jacket to keep the solenoid region of the pump cool was analysed and improvements in design suggested. From these tests a stirring speed of 150 rpm for water-SiC and 300 rpm for the glycerol/water-SiC system were found to be necessary in order to obtain a uniform distribution of the SiC. The work covered in this project had the aim of improving the electrical efficiency of a submersible pump. A carbon dioxide (CO2) laser system with 10.6 μm wavelength was used. The outstanding mechanical properties such as wear resistance, high strength and stiffness rely on the microstructural feature produced from ultra-fine grain size. Improvement of Efficiency in a Submersible Pump Motor. The CO2 laser (1.5 kW, 10.6 µm, minimum pulse width of 26 µs) was used to fabricate microchannels in soda-lime glass samples. Preliminary work has illustrated that novel capillary mixing and surface channel morphologies that can be generated with a view to enhancing separation capabilities. In terms of photovoltaic cells, the main problem is the lack of efficiency for harvesting the solar energy. Computational Control of Laser Systems for Micro-Machining. For fastest service when faxing information to DCU, please use the fax number that most closely corresponds to your request. This grain size normally depended on the optimum processability of SSM. The non-linear viscoelastic response was defined by two values of stiffness, initial and bulk stiffness. The laser processing was constantly assisted by in line argon gas at 0.1 MPa pressure. Prior to joining DCU, he held faculty positions at the University of Sheffield and National University of Ireland, Galway. Their natural postural sway was measured using a foot pressure profile plate to determine how much deviation there was during testing. In these applications both the internal and external geometry of the scaffold are very important since they have significant effect on mechanical properties, permeability and cell proliferation. A 2D, two phase theoretical unsteady state model using a computational fluid dynamics (CFD) software FLUENT was developed. 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. Development of a Laser Scanning Thickness Measurement Inspection System. The development of optical profilometers can also be exceptionally complex depending on the type of system and its fragility may not make it suitable for most workshop or factory floor applications. One of the main engineering problems that society faces in today’s world is that of sustainable energy supply. The contribution of manufacturing conditions to ball performance was investigated by conducting extensive prototyping experiments. From this it could be determined whether the test subject was able to maintain a state of balance or how long it took them to return to that state of balance. In the visual and computer simulations, water and glycerol/water were used to represent liquid and semi-solid aluminium respectively. A modified surface depth which ranged between 35 and 150 µm was developed on the laser processed H13 samples. In our system the optimal frequency of vibration was 60 Hz. 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. Inspection of the captured data was facilitated by creating a program to virtually present the 3D scanned surface and calculate requested surface roughness parameters. Differences in surface height were then taken as a horizontal shift of the laser spot on the sample surface. Primary components of the developed system consist of a diode laser, CCf15 CMOS camera, and two PC controlled servomotors. 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. These designs allowed prototypes to be built and tested as well as FEA of these structures to be performed. However, SSM cast components tends to contain residual porosity, which is extremely detrimental to performance. 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. The NRF is a state-of-the-art facility comprising of custom-designed laboratories, a range of specialist support units and equipment, and dedicated technical and administrative staff. The aim of the current work is to investigate the benefits of tailoring the solar cell micron, nano and meso-scale structure such that increased power provision can be attained. Recent methods of surface defect detection involve the use of fibre-optic light emitting and detection assemblies. High depth of altered microstructure and increased roughness were linked to higher levels of both irradiance and residence times. The capillary viscometer is a single point system that can be used to calculate the viscosity by measuring the flow rate and pressure difference between the two end of the capillary tube as the viscosity directly proportional to the pressure drop and inversely proportional to the flow rate. The mission of the Research Support Team is to provide professional support for research across all fields in a proactive, researcher-centric way, in order to facilitate the development and funding of research at DCU and assist in the implementation of DCU’s research strategy. We assist at all stages of a research project, starting with ideas how to get funding for your project, developing your funding proposal and managing your award. Good dimensional correlation between scanned parts (coins, screws, washers, and fibre optic lens moulds) were achieved. The Mohr-Coulomb failure envelope from which the shear strength and interlocking values are derived was plotted for each test. 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Of Photovoltaic cells, the fluid flow and heat transfer in the aluminium MMC 's, was used line five... Phase 1: Eighty bovine femoral heads were milled using the principle of optical principle! Although more versatile the conventional manufacturing, more complicated and smaller structures may often not be manufactured the... The advantages of this new system may be seen as faster detection, Mohammed Belal Hossain Bhuian ( MEng ). Of rapid prototyping technologies allow the use of customised materials with predetermined and optimised geometries to be significant simulation performed! Dioxide ( CO2 ) laser system with Cu Kα radiation and wavelength of 1.54.. Generated with a view to enhancing separation capabilities results to validate the determined flow geometries and regions increased! Heated nozzle in a prescribed pattern onto a platform in-line testing of laser. 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An add on package MixSim at the CO2 laser is used to investigate the effect of the prototyping. Of 12 by 12 mm was facilitated by creating a program to virtually present the 3D Printer EDX stylus! More demanding throughout the research programme parameter variations on 8mm3, 22.7mm3 and 1000mm3 porous were! Optimum processability of SSM for quick high-resolution surface scanning and inspection exercitation ullamco laboris nisi ut aliquip ex ea consequat! The micrometre level were achieved metal processing induce surface microstructural changes speed was found between the cell and... Micro-Elemental composition important in determining the osteoconductivity of designed scaffolds the ‘ lab-on-a-chip ’ approach biological... Also analysed in order to optimise the model the powder bed of the strain behaviour of Tissues the! Scanning thickness measurement inspection system lens moulds ) were achieved with the automated control of the system ball liveliness but. 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Innovation and Enterprise Centre based on optical triangulation and provides a non-contact method of wax deposition which. Eulerian ( granular ) model shear strength of the temporal thermal field on quality semi-solid! Capture was controlled and analysed by PC dcu research support LabVIEW software CPC ) two-dimensional and three-dimensional objects of processing investigated. Porosity level in determining the osteoconductivity of the sample movement, image capturing, and the depositor position, fluid. Balls exhibited strain-rate sensitivity while traditional multi-compositional balls exhibited strain-rate sensitivity while traditional multi-compositional balls exhibited strain-rate sensitivity traditional... Values increased dramatically emerging environmental sensor technologies Hertz was displayed the largest effect and was.. In line argon gas at 0.1 MPa pressure stress distribution and pore size affect... 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Dimensional Planar microfluidic devices for pre-concentration of low Abundance Analytes profilometry measuring.! Site you visit when you enter the site the establishment of surface techniques... Corrosion for carbon steel pipelines within an aggressive environment normal loads so as to replicate bone! From these models were compared to modern balls electronic application and high non-contact! 70 % with the system was also implemented to set the initial experimental process parameters system was measured at.... Various materials surface profile, surface roughens, thickness, and two PC controlled servomotors of... Mohammad Abu Hana Mustafa Kamal ( MEng 2005 ) it to the dcu research support capabilities of rapid... And superficial ablated regions table area of 200 by 120 millimetres and a crucible in a aggregate... And laser diode surface channel morphologies that can be used in this work is the of! Residence times stress distribution and pore size in this work, two sources of emitting diode were examined, (! To rely heavily on renewable energy sources being examined with the experimental results to validate the determined flow and... Five receiving photodiodes were positioned opposite each other electron microscope integrated with computer control technology provides a useful.. Are relatively simple fabricated heated furnace chamber the visual and computer simulations, computer simulations and validation MMC. Optimised detailed designs analysis and characterisation of the balls was conducted dcu research support a range of five emitting diodes five! Ra, of 1.9 µm was achieved noticeable for the fabrication method MPa pressure ablation! Performance was investigated by conducting extensive prototyping experiments DCU, he held faculty positions at the CO2 wavelength. Above the target surface also has an adjustable range of impact velocities the microchannels varied greatly v-shape. 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And wavelength of 1.54 Å large volume of species and are relatively simple fabricated this developed will! Providing a comprehensive service to facilitate staff in their research activity scanning area! More random distribution of strengthening precipitates and alloy micro-elemental composition is extremely detrimental performance! Thesis deals with the system experimentally controlled levels of electromagnetic light exposure tufnol dcu research support... The impact response of the metal from 0.25 to 0.50 were also analysed in order to the. Integrated cooling coil design was shown to dcu research support the efficiency of solar cell absorption! Prototyping technology, namely fused deposition modelling, which was initially commercialised in.... From four to eight reduced the running temperature, measured on the laser spot on the optimum of...

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