All academic publications

Search or filter publications

Filter by type:

Filter by publication type

Filter by year:

to

Results

  • Showing results for:
  • Reset all filters

Search results

  • CONFERENCE PAPER
    Abolghasemi M, Piggott MD, Spinneken J, Vire A, Cotter CJ, Crammond Set al.,

    Simulating tidal turbines with mesh optimisation and RANS turbulence models

    , 2015 European Wave and Tidal Energy Conference
  • CONFERENCE PAPER
    Acha S, van Dam KH, Keirstead J, Shah Net al.,

    Integrated modelling of agent-based electric vehicles into optimal power flow studies

    , Frankfurt, Germany
  • CONFERENCE PAPER
    Ahmad F, Murphy W, Lawrence JA, Hencher Set al.,

    Strength Mobilisation of Rock Masses in Relation to Deep Seated Landslide

    , Geophysical Research Abstracts 17, EGU2015, 8151
  • JOURNAL ARTICLE
    Avdis A, Jacobs CT, Hill J, Piggott MD, Gorman GJet al.,

    Shoreline and Bathymetry Approximation in Mesh Generation for Tidal Renewable Simulations

    Due to the fractal nature of the domain geometry in geophysical flowsimulations, a completely accurate description of the domain in terms of acomputational mesh is frequently deemed infeasible. Shoreline and bathymetrysimplification methods are used to remove small scale details in the geometry,particularly in areas away from the region of interest. To that end, a novelmethod for shoreline and bathymetry simplification is presented. Existingshoreline simplification methods typically remove points if the resultantgeometry satisfies particular geometric criteria. Bathymetry is usuallysimplified using traditional filtering techniques, that remove unwanted Fouriermodes. Principal Component Analysis (PCA) has been used in other fields toisolate small-scale structures from larger scale coherent features in a robustway, underpinned by a rigorous but simple mathematical framework. Here wepresent a method based on principal component analysis aimed towardssimplification of shorelines and bathymetry. We present the algorithm in detailand show simplified shorelines and bathymetry in the wider region around theNorth Sea. Finally, the methods are used in the context of unstructured meshgeneration aimed at tidal resource assessment simulations in the coastalregions around the UK.

  • JOURNAL ARTICLE
    Barral N, Knepley MG, Lange M, Piggott MD, Gorman GJet al.,

    Anisotropic mesh adaptation in Firedrake with PETSc DMPlex

    Despite decades of research in this area, mesh adaptation capabilities arestill rarely found in numerical simulation software. We postulate that theprimary reason for this is lack of usability. Integrating mesh adaptation intoexisting software is difficult as non-trivial operators, such as error metricsand interpolation operators, are required, and integrating available adaptiveremeshers is not straightforward. Our approach presented here is to firstintegrate Pragmatic, an anisotropic mesh adaptation library, into DMPlex, aPETSc object that manages unstructured meshes and their interactions withPETSc's solvers and I/O routines. As PETSc is already widely used, this willmake anisotropic mesh adaptation available to a much larger community. As ademonstration of this we describe the integration of anisotropic meshadaptation into Firedrake, an automated Finite Element based system for theportable solution of partial differential equations which already uses PETScsolvers and I/O via DMPlex. We present a proof of concept of this integrationwith a three-dimensional advection test case.

  • CONFERENCE PAPER
    Bixby H, Fecht D, Fortunato L, Hodgson Set al.,

    Are greener cities healthier? An investigation into the association between green space coverage and health at the city level, in England

    , joint meeting of the International Society for Environmental Epidemiology (ISEE), the International Society of Exposure Science (ISES), and the International Society of Indoor Air Quality and Climate (ISIAQ)., Publisher: National Institute of Environmental Health Sciences (NIEHS), ISSN: 1552-9924
  • CONFERENCE PAPER
    Busby JP, Senfaute G, Gourry JC, Lawrence JA, Pederson SAS, Mortimore RNet al.,

    Developing tools for the prediction of catastrophic coastal cliff collapse

    , In: Proceedings of the 7th International Symposium – Delivering Sustainable Coasts: Connecting Science and Policy, Pages: 596-601
  • JOURNAL ARTICLE
    Funke SW, Farrell PE, Piggott MD,

    Reconstructing wave profiles from inundation data

    This paper applies variational data assimilation to inundation problemsgoverned by the shallow water equations with wetting and drying. The objectiveof the assimilation is to recover an unknown time-varying wave profile at anopen ocean boundary from inundation observations. This problem is solved withderivative-based optimisation and an adjoint wetting and drying scheme toefficiently compute sensitivity information. The capabilities of this approachare demonstrated on an idealised sloping beach setup in which the profile of anincoming wave is reconstructed from wet/dry interface observations. The methodis robust against noisy observations if a regularisation term is added to theoptimisation objective. Finally, the method is applied to a laboratoryexperiment of the Hokkaido-Nansei-Oki tsunami, where the wave profile isreconstructed with an error of less than 1% of the reference wave signal.

  • JOURNAL ARTICLE
    Funke SW, Kramer SC, Piggott MD,

    Design optimisation and resource assessment for tidal-stream renewable energy farms using a new continuous turbine approach

    , Renewable Energy, ISSN: 1879-0682

    This paper presents a new approach for optimising the design of tidal stream turbine farms. In this approach, the turbine farm is represented by a turbine density function that specifies the number of turbines per unit area and an associated continuous locally-enhanced bottom friction field. The farm design question is formulated as a mathematical optimisation problem constrained by the shallow water equations and solved with efficient, gradient-based optimisation methods. The resulting method is accurate, computationally efficient, allows complex installation constraints, and supports different goal quantities such as to maximise power or profit. The outputs of the optimisation are the optimal number of turbines, their location within the farm, the overall farm profit, the farm's power extraction, and the installation cost.We demonstrate the capabilities of the method on a validated numerical model of the Pentland Firth, Scotland. We optimise the design of four tidal farms simultaneously, as well as individually, and study how farms in close proximity may impact upon one another.

  • JOURNAL ARTICLE
    Goode AE, Hine NDM, Chen S, Bergin SD, Shaffer MSP, Ryan MP, Haynes PD, Porter AE, McComb DWet al.,

    Mapping functional groups on oxidised multi-walled carbon nanotubes at the nanometre scale

    , Chemical Communications, ISSN: 1364-548X
  • CONFERENCE PAPER
    Green RJ, Staffell I,

    Storage in the electricity market

    , International Ruhr Energy Conference 2015
  • CONFERENCE PAPER
    Heuberger CF, Staffell I, Shah N, Mac Dowell Net al.,

    Levelised Value of Technology - A Systemic Approach to Technology Valuation

    , 26th European Symposium on Computer Aided Process Engineering - ESCAPE 26
  • JOURNAL ARTICLE
    Jackson M, Weyl O, Altermatt F, Durance I, Friberg N, Dumbrell A, Piggott J, Tiegs S, Tockner K, Krug C, Leadley P, Woodward Get al.,

    Recommendations for the Next Generation of Global Freshwater Biological Monitoring Tools

    , Advances in Ecological Research, ISSN: 0065-2504

    Biological monitoring has a long history in freshwaters, where much of the pioneering work in this field was developed over a hundred years ago – but few of the traditional monitoring tools provide the global perspective on biodiversity loss and its consequences for ecosystem functioning that are now needed. Rather than forcing existing monitoring paradigms to respond to questions they were never originally designed to address, we need to take a step back and assess the prospects for novel approaches that could be developed and adopted in the future. To resolve some of the issues with indicators currently used to inform policymakers, we highlight new biological monitoring tools that are being used, or could be developed in the near future, which (1) consider less-studied taxonomic groups; (2) are standardised across regions to allow global comparisons, and (3) measure change over multiple time points. The new tools we suggest make use of some of the key technological and logistical advances seen in recent years – including remote sensing, molecular tools, and local-to-global citizen science networks. We recommend that these new indicators should be considered in future assessments of freshwater ecosystem health and contribute to the evidence base for global to regional (and national) assessments of biodiversity and ecosystem services: for example, within the emerging framework of the Intergovernmental Platform on Biodiversity and Ecosystem Services.

  • JOURNAL ARTICLE
    Kline KL, Msangi S, Dale VH, Woods J, Souza GM, Osseweijer P, Clancy JS, Hilbert JA, Mugera HK, McDonnell PC, Johnson FXet al.,

    Reconciling biofuels and food security: priorities for action

    , Global Change Biology Bioenergy, ISSN: 1757-1693

    Addressing the challenges of understanding and managing complex interactions among food security, biofuels, and resource management requires a focus on specific contextual problems and opportunities. The United Nations’ 2030 Sustainable Development Goals prioritize food and energy security; bioenergy plays an important role in achieving both goals. Effective food security programs begin by clearly defining the problem and asking, “What can be done to effectively assist people at high risk?” Headlines and cartoons that blame biofuels for food insecurity may reflect good intentions but mislead the public and policy makers because they obscure the main drivers of local food insecurity and ignore opportunities for biofuels to contribute to solutions. Applying sustainability guidelines to bioenergy will help achieve near- and long- term goals to eradicate hunger. Priorities for achieving successful synergies between bioenergy and food security include (1) clarifying communications with clear and consistent terms, (2) recognizing that food and bioenergy need not compete for land and instead, need to be integrated with improved resource management, (3) investing in innovations to build capacity and infrastructure such as rural agricultural extension and technology, (4) promoting stable prices that incentivize local production, (5) adopting flex crops that can provide food along with other products and services to society, and (6) engaging stakeholders in identifying and assessing specific opportunities for biofuels to improve food security. Systematic monitoring and analysis to support adaptive management and continual improvement are essential elements to build synergies and help society equitably meet growing demands for both food and energy.

  • JOURNAL ARTICLE
    Lawrence JA,

    Soil and Rock Description in Engineering Practice, D. Norbury: Book review

    , International Journal of Rock Mechanics & Mining Sciences, Pages: 1381-1381
  • JOURNAL ARTICLE
    Lawrence JA,

    Informing chalk cliff recession management decisions

    , Civil Engineering Year Book 2010, Pages: 17-18
  • JOURNAL ARTICLE
    Levontin P, Baranowski P, Leach AW, Bailey A, Mumford JD, Quetglas A, Kell LTet al.,

    On the role of visualisation in fisheries management

    , Marine Policy, ISSN: 1872-9460

    Environmental change has focused the attention of scientists, policy makers and the wider public on the uncertainty inherent in interactions between people and the environment. Governance in fisheries is required to involve stakeholder participation and tobe more inclusive in its remit, which is no longer limited to ensuring a maximum sustainable yield from a single stock but considers species and habitat interactions, as well as social and economic issues. The increase in scope, complexity and awareness of uncertainty in fisheries management has brought methodological and institutional changes throughout the world. Progress towards comprehensive, explicit and participatory risk management in fisheries depends on effective communication. Graphic design and data visualisation have been underused in fisheries for communicating science to a wider range of stakeholders. In this paper, some of the general aspects of designing visualisations of modeling results are discussed and illustrated withexamples from the EU funded MYFISH project. These infographicswere tested in stakeholder workshops, and improved through feedbackfrom that 2process. It is desirable to convey not just modelling results but a sense of how reliable various models are. A survey was developed to judge reliability of different components of fisheries modelling: the quality of data, the quality of knowledge, model validation efforts, and robustness to key uncertainties. The results of these surveys were visualized for ten different models, and presented alongside the main case study.

  • JOURNAL ARTICLE
    Mao F, Clark J, Karpouzoglou T, Dewulf A, Buytaert W, Hannah Det al.,

    A conceptual framework for assessing socio-hydrological resilience under change

    , Hydrology and Earth System Sciences Discussions, Pages: 1-26
  • CONFERENCE PAPER
    Mechleri E, fennell P, Mac Dowell N,

    Flexible operation strategies for coal- and gas-CCS power stations under the UK and USA markets

    , 13th Greenhouse Gas Control Technologies (GHGT) conference
  • CONFERENCE PAPER
    Mechleri E, rivotti P, mac Dowell N, thornhill Net al.,

    Flexibility issues and controllability analysis of a post-combustion CO2 capture plant integrated with a natural gas power plant

    , 8th Trondheim Conference on CO2 Capture, Transport and Storage (TCCS-8)
  • JOURNAL ARTICLE
    Nixon CW, McNeill LC, Bull JM, Bell RE, Gawthorpe RL, Henstock TJ, Christodoulou, Ford M, Taylor B, Sakellariou D, Ferentinos G, Papatheodorou G, Leeder M, Collier RELI, Goodliffe A, Sachpazi M, Kranis Het al.,

    Rapid spatio-temporal variations in rift structure during development of the Corinth Rift, central Greece

    , Tectonics, ISSN: 1944-9194
  • JOURNAL ARTICLE
    Stucky de Quay G, Roberts GG, Watson JS, Jackson CA-Let al.,

    Incipient mantle plume evolution: Constraints from ancient landscapes buried beneath the North Sea

    , Geochemistry, Geophysics, Geosystems, ISSN: 1525-2027
  • JOURNAL ARTICLE
    Thomas RT, Prentice IC, Graven H, Ciais P, Fisher JB, Hayes DJ, Huang M, Huntzinger DN, Ito A, Jain A, Mao J, Michalak AM, Peng S, Poulter B, Ricciuto DM, Shi X, Schwalm C, Tian H, Zeng Net al.,

    Increased light-use efficiency in northern terrestrial ecosystems indicated by CO2 and greening observations.

    , Geophysical Research Letters, ISSN: 1944-8007
  • JOURNAL ARTICLE
    Woodward G,

    Networking agroecology: integrating the diversity of agroecosystem interactions

    , Advance in Ecological Research
  • JOURNAL ARTICLE
    Balcombe P, Anderson K, Speirs J, Brandon N, Hawkes Aet al., 2017,

    The Natural Gas Supply Chain: The Importance of Methane and Carbon Dioxide Emissions

    , ACS SUSTAINABLE CHEMISTRY & ENGINEERING, Vol: 5, Pages: 3-20, ISSN: 2168-0485
  • JOURNAL ARTICLE
    Baran D, Ashraf RS, Hanifi DA, Abdelsamie M, Gasparini N, Rohr JA, Holliday S, Wadsworth A, Lockett S, Neophytou M, Emmott CJM, Nelson J, Brabec CJ, Amassian A, Salleo A, Kirchartz T, Durrant JR, McCulloch Iet al., 2017,

    Reducing the effciency-stability-cost gap of organic photovoltaics with highly effcient and stable small molecule acceptor ternary solar cells

    , NATURE MATERIALS, Vol: 16, Pages: 363-+, ISSN: 1476-1122
  • JOURNAL ARTICLE
    Bertei A, Tariq F, Yufit V, Ruiz-Trejo E, Brandon NPet al., 2017,

    Guidelines for the Rational Design and Engineering of 3D Manufactured Solid Oxide Fuel Cell Composite Electrodes

    , Journal of The Electrochemical Society, Vol: 164, Pages: F89-F98, ISSN: 0013-4651
  • JOURNAL ARTICLE
    Bhave A, Taylor RHS, Fennell P, Livingston WR, Shah N, Mac Dowell N, Dennis J, Kraft M, Pourkashanian M, Insa M, Jones J, Burdett N, Bauen A, Beal C, Smallbone A, Akroyd Jet al., 2017,

    Screening and techno-economic assessment of biomass-based power generation with CCS technologies to meet 2050 CO2 targets

    , APPLIED ENERGY, Vol: 190, Pages: 481-489, ISSN: 0306-2619
  • JOURNAL ARTICLE
    Biton M, Yufit V, Tariq F, Kishimoto M, Brandon Net al., 2017,

    Enhanced Imaging of Lithium Ion Battery Electrode Materials

    , JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol: 164, Pages: A6032-A6038, ISSN: 0013-4651
  • JOURNAL ARTICLE
    Bridgestock L, Rehkämper M, van de Flierdt T, Murphy K, Khondoker R, Baker AR, Chance R, Strekopytov S, Humphreys-Williams E, Achterberg EPet al., 2017,

    The Cd isotope composition of atmospheric aerosols from the tropical Atlantic Ocean

    , Geophysical Research Letters, ISSN: 0094-8276

This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.

Request URL: http://wlsprd.imperial.ac.uk:80/respub/WEB-INF/jsp/search-t4-html.jsp Request URI: /respub/WEB-INF/jsp/search-t4-html.jsp Query String: id=278&limit=30&respub-action=search.html Current Millis: 1493402738271 Current Time: Fri Apr 28 19:05:38 BST 2017