Now showing items 736-755 of 1169

  • Observation of T2-like coherent optical phonons in epitaxial Ge2Sb2Te5/GaSb(001) films 

    Shalini, Ashawaraya; Liu, Y.; Al-Jarah, Uday Ali Sabeeh; Srivastava, G.P.; Wright, C. David; Katmis, F.; Braun, W.; Hicken, R.J. (Nature Publishing Group, 2013)
    The phonon spectrum of Ge2Sb2Te5 is a signature of its crystallographic structure and underlies the phase transition process used in memory applications. Epitaxial materials allow coherent optical phonons to be studied in ...
  • Observer-based controller design with disturbance feedforward framework for formation control of satellites 

    Prathyush, P. Menon; Edwards, Christopher; Gomes Paulino, Nuni M. (Institution of Engineering and Technology (IET), 2015)
    In this study, a bespoke sliding mode non-linear observer and a linear controller framework is proposed for achieving robust formation control of a cluster of satellites in the case of a circular reference orbit. Exploiting ...
  • Observer-based controller for floor vibration control with optimisation algorithms 

    Nyawako, Donald S.; Reynolds, Paul (SAGE Publications, 2015)
    This study presents the results of vibration suppression of a walkway bridge structure with a single actuator and sensor pair by using a proportional-integral (PI) controller and observer-based pole- placement controllers. ...
  • Offshore Wind Farm Electrical Cable Layout Optimization 

    Pillai, AC; Chick, J; Johanning, Lars; Khorasanchi, M; de Laleu, V (Taylor & Francis, 2015-01-13)
    This article explores an automated approach for the efficient placement of substations and the design of an inter-array electrical collection network for an offshore wind farm through the minimization of the cost. To ...
  • Offshore Wind Farm Layout Optimization Using Particle Swarm Optimization 

    Pillai, A; Chick, J; Khorasanchi, M; Johanning, L (Springer, 2018)
    This article explores the application of a wind farm layout optimization framework using a particle swarm optimizer to three benchmark test cases. The developed framework introduces an increased level of detail characterizing ...
  • Offshore wind installation costs - A comparative assessment for UK offshore rounds 1, 2 and 3 

    Thies, PR; Paterson, J; D'Amico, F; Kurt, R; Harrison, G (Wind Europe; renewableUK, 2017-06-06)
    Marine operations play a pivotal role throughout all phases of a wind farm’s life cycle. In particular uncertainties associated with offshore installations can extend construction schedules and increase the capital expenditure ...
  • Offshore wind installation vessels – A comparative assessment for UK offshore rounds 1 and 2 

    Thies, PR; Paterson, J; D'Amico, F; Kurt, R; Harrison, G (Elsevier, 2017-06-06)
    Marine operations play a pivotal role throughout all phases of a wind farm’s life cycle. In particular uncertainties associated with offshore installations can extend construction schedules and increase the capital expenditure ...
  • An offshore wind union? Diversity and convergence in European offshore wind governance 

    Fitch-Roy, O (Taylor & Francis, 2015-12-18)
    Offshore wind megaprojects in European waters have significant carbon abatement potential and increasing their number is a policy goal for several European maritime nations. But experience has shown that governance of ...
  • An offshore wind union? Diversity and convergence in European offshore wind governance 

    Fitch-Roy, OWF (-, 2015-06-17)
    Offshore wind megaprojects in European waters have significant carbon abatement potential and increasing their number is a policy goal for several European maritime nations. But experience has shown that governance of ...
  • On applications of ant colony optimisation techniques in solving assembly line balancing problems 

    Kucukkoc, I; Zhang, DZ (The Operational Research Society, 2013-09)
    Recently, there is an increasing interest in applications of meta-heuristic approaches in solving various engineering problems. Meta-heuristics help both academics and practitioners to get not only feasible but also near ...
  • On distributed pinning observers for a network of dynamical systems 

    Edwards, Christopher; Menon, Prathyush P. (Institute of Electrical and Electronics Engineers (IEEE), 2016-03-24)
    In this paper, a distributed observer structure is proposed to estimate the states of a large scale network of semi-linear systems interconnected by a positive, time varying coupling strength. The distributed observer ...
  • On output tracking using dynamic output feedback discrete-time sliding-mode controllers 

    Lai, NO; Edwards, Christopher; Spurgeon, SK (Institute of Electrical and Electronics Engineers (IEEE), 2007-10-15)
    In this note, an output feedback based discrete-time sliding-mode control scheme is proposed. It incorporates a steady-state tracking requirement through the use of integral action. Previous work has shown that with an ...
  • On peak mooring loads and the influence of environmental conditions for marine energy converters 

    Harnois, V; Thies, PR; Johanning, Lars (MDPI, 2016-04-08)
    Mooring systems are among the most critical sub-systems for floating marine energy converters (MEC). In particular, the occurrence of peak mooring loads on MEC mooring systems must be carefully evaluated in order to ensure ...
  • On the Analysis of a Wave Energy Farm with Focus on Maintenance Operations 

    Rinaldi, G; Thies, PR; Walker, R; Johanning, L (MDPI, 2016-08-23)
    Wave energy has a promising technical potential that could contribute to the future energy mix. However, costs related to the deployment of wave energy converters (WECs) are still high compared to other technologies. In ...
  • On the effective strain tensor in heterogeneous materials 

    Berger, M.A.; Evans, Kenneth E; Smith, Christopher W. (SAGE Publications, 2014-02-09)
    This paper considers effective strain tensors within the context of linear elastic equilibrium theory. The elastic properties of structured materials are often averaged over subvolumes of various scales inside the material. ...
  • On the interaction of uni-directional and bi-directional buckling of a plate supported by an elastic foundation 

    Wadee, MK; Lloyd, DJB; Bassom, AP (Royal Society, 2016-04-13)
    A thin flat rectangular plate supported on its edges and subjected to in-plane loading exhibits stable post-buckling behaviour. However, the introduction of a nonlinear (softening) elastic foundation may cause the response ...
  • On the pressure response in the brain due to short duration blunt impacts 

    Pearce, Christopher W.; Young, Philippe G. (Public Library of Science, 2014-12-05)
    When the head is subject to non-penetrating (blunt) impact, contusion-type injuries are commonly identified beneath the impact site (the coup) and, in some instances, at the opposite pole (the contre-coup). This pattern ...
  • On the solvability of the constrained Lyapunov problem 

    Edwards, Christopher; Yan, X-G; Spurgeon, SK (Institute of Electrical and Electronics Engineers (IEEE), 2007-10)
    This paper considers system theoretic conditions for the solvability of the so-called constrained Lyapunov problem for nonsquare systems. These problems commonly appear in the control systems literature. Both a static ...
  • On-chip photonic memory elements employing phase-change materials 

    Rios, Carlos; Hosseini, Peiman; Wright, C. David; Bhaskaran, Harish; Pernice, Wolfram H.P. (Wiley, 2013)
    Phase-change materials integrated into nanophotonic circuits provide a flexible way to realize tunable optical components. Relying on the enormous refractive-index contrast between the amorphous and crystalline states, ...
  • On-chip photonic synapse 

    Cheng, Z; Ríos, C; Pernice, WHP; Wright, CD; Bhaskaran, H (American Association for the Advancement of Science, 2017-09-27)
    The search for new "neuromorphic computing" architectures that mimic the brain's approach to simultaneous processing and storage of information is intense. Because, in real brains, neuronal synapses outnumber neurons by ...