African University of Science and Technology: Recent submissions

Now showing items 881-900 of 4810

  • Digital Audio Effects 

    Unknown author (2011-02-22)

  • Experimental characterisation of bubbly flow using MRI 

    Tayler, Alexander B. (University of CambridgeDepartment of Chemical Engineering and BiotechnologyTrinity College, 2011-11-08)
    This thesis describes the first application of ultra-fast magnetic resonance imaging (MRI) towards the characterisation of bubbly flow systems. The principle goal of this study is to provide a hydrodynamic characterisation ...

  • The effect of inkjet ink composition on rheology and jetting behaviour 

    Vadillo, Damien; Hoath, Stephen Daniel; Hsiao, W-K; Mackley, MR (Proc 27th Int. Conf. on Digital Printing Technologies, 2011)
    This work presents recent results on the way linear and non linear viscoelastic properties of the fluids affect the jetting mechanism. Recent progress on quantitative characterising both high frequency linear (LVE) and ...

  • Inkjet printing of non-Newtonian fluids 

    Morrison, N. F.; Harlen, O. G. (Proc 27th Int. Conf. on Digital Printing Technologies, NIP27, 2011)
    Jet breakup is strongly affected by fluid rheology. In particular,small amounts of polymer can cause substantially different breakup dynamics compared to a Newtonian jet, influencing in-flight fragmentation and detachment ...

  • Holographic Measurement of Drop-on-Demand Drops in Flight 

    Martin, Graham Dagnall; Castrejon-Pita, Jose Rafael; Hutchings, Ian Michael (Proc 27th Int. Conf. on Digital Printing Technologies, NIP27, 2011)
    The analysis of images of ink drops in flight can provide information about jet straightness, drop velocity and volume. However trade-offs between field of view, optical and digital resolution and other factors such as ...

  • Ultra-High Speed Particle Image Velocimetry on Drop-on-Demand Jetting 

    Castrejon-Pita, Jose Rafael; Hoath, Stephen Daniel; Castrejon-Pita, Alfonso Arturo; Morrison, NF; Hsiao, Wen-Kai; Hutchings, Ian Michael (Proc 27th Int. Conf. on Digital Printing Technologies NIP27, 2011)
    An experimental setup to study the dynamics of droplet jetting from a commercially available print-head is described. A MicroFab print-head with an 80 µm diameter transparent nozzle was set to print droplets at a speed ...

  • Jetting, In-Nozzle Meniscus Motion and Nozzle-Plate Flooding in an Industrial Drop-on-Demand Print Head 

    Hsiao, W-K; Hoath, Stephen Daniel; Martin, Graham Dagnall; Hutchings, Ian Michael (Proc 27th Int. Conf. on Digital Printing Technologies, NIP27, 2011)
    The state of the ink film at and near the nozzles of a drop-ondemand(DoD) print head during jetting has a direct impact on printing performance and reliability. We have developed highspeed imaging apparatus and analytical ...

  • Dependence of drop speed on nozzle diameter, viscosity and drive amplitude in drop-on-demand ink-jet printing 

    Hoath, Stephen Daniel; Hsiao, W-K; Jung, Sungjune; Martin, Graham Dagnall; Hutchings, Ian Michael (Proc 27th Int. Conf. on Digital Printing Technologies, NIP27, 2011)
    Results of recent experiments and numerical simulations are presented, which have been used to establish empirical rules for the dependence of drop speed on nozzle diameter and drive amplitude for Newtonian and non-Newtonian ...

  • Measurements of the structure of turbulent premixed and stratified methane/air flames 

    Sweeney, Mark (University of CambridgeDepartment of Engineering, 2011-11-08)
    The influence of stratification on the structure of turbulent methane/air combustion is investigated using experimental data from laboratory scale burners: a weakly turbulent slot burner, and a higher turbulence co-annular ...

  • Second-order algebraic theories 

    Mahmoud, Ola (University of CambridgeFaculty of Computer Science and Technology, 2011-11-08)
    Second-order universal algebra and second-order equational logic respectively provide a model theory and a formal deductive system for languages with variable binding and parameterised metavariables. This work completes ...

  • In-situ photocatalytic remediation of organic contaminants in groundwater 

    Lim, Leonard Lik Pueh (University of CambridgeDepartment of EngineeringClare Hall, 2010-07-06)
    This research is about the development of a photocatalytic reactor design, Honeycomb, for in-situ groundwater remediation. Photocatalysis, typically a pseudo first order advanced oxidation process, is initiated via the ...

  • Stochastic hub and spoke networks 

    Hult, Edward Eric (University of CambridgeJudge Business School, 2011-10-11)
    Transportation systems such as mail, freight, passenger and even telecommunication systems most often employ a hub and spoke network structure since correctly designed they give a strong balance between high service quality ...

  • A systems approach to improving patient safety through medical device purchasing 

    Hinrichs, Saba (University of CambridgeDepartment of EngineeringSt John's College, 2010-10-12)
    The purchase of medical devices involves engaging various stakeholders as well as balancing clinical, technical and financial requirements. Failure to consider these requirements can lead to wider consequences in the ...

  • Experimental investigation of the impact, spreading, and drying of picolitre droplets onto substrates with a broad range of wettabilities 

    Berson, A. (2011-10-02)
    The effect of the substrate wettability on the deposition of picolitre droplets by drop-on-demand technology is investigated experimentally. Substrates with a broad range of wettabilities are considered with contact ...

  • Acoustics and manufacture of Caribbean steelpans 

    Maloney, Soren E. (University of CambridgeDepartment of EngineeringWolfson CollegeInstitute for Manufacturing, 2011-03-15)
    The Caribbean steelpan is a pitched percussion instrument that originated in Trinidad and Tobago during the Second World War. Despite several research initiatives to improve the making of this relatively new instrument, ...

  • The role and contribution of the Chief Technology Officer 

    van der Hoven, Christopher (University of CambridgeDepartment of EngineeringIfM Centre for Technology ManagementDarwin College, 2011-10-11)
    The Role and Contribution of the Chief Technology Officer The role of the Chief Technology Officer (CTO) came about because of new organisational demands on technology leaders in the 1980s. The initial research objective ...

  • Vibration from underground railways: considering piled foundations and twin tunnels 

    Kuo, Kirsty Alison (University of CambridgeDepartment of Engineering, 2011-02-08)
    Accurate predictions of ground-borne vibration levels in the vicinity of an underground railway are greatly sought after in modern urban centers. Yet the complexity involved in simulating the underground environment means ...

  • A model personal energy meter 

    Hay, Simon (University of CambridgeFaculty of Computer Science and TechnologyComputer Laboratory, 2011-10-11)
    Every day each of us consumes a significant amount of energy, both directly through transport, heating and use of appliances, and indirectly from our needs for the production of food, manufacture of goods and provision of ...

  • Thin-walled composite deployable booms with tape-spring hinges 

    Mallikarachchi, H.M. Yasitha Chinthaka (University of CambridgeDepartment of EngineeringWolfson College, 2011-07-12)
    Deployable structures made from ultra-thin composite materials can be folded elastically and are able to self-deploy by releasing the stored strain energy. Their lightness, low cost due to smaller number of components, ...

  • Social network support for data delivery infrastructures 

    Sastry, Nishanth Ramakrishna (University of CambridgeFaculty of Computer Science and TechnologyComputer Laboratory, 2011-10-11)
    Network infrastructures often need to stage content so that it is accessible to consumers. The standard solution, deploying the content on a centralised server, can be inadequate in several situations. Our thesis is ...