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  • Journal article
    Ochoa Rodriguez S, Wang L-P, Thraves L, Johnston A, Onof Cet al., 2015,

    Surface water flood warnings in England: overview, Assessment and recommendations based on survey responses and workshops

    , Journal of Flood Risk Management, Vol: 11, Pages: S211-S221, ISSN: 1753-318X

    Following extensive surface water flooding (SWF) in England in summer 2007, progress has been made in improving the management and prediction of this type of flooding. A rainfall threshold-based extreme rainfall alert (ERA) service was launched in 2009 and superseded in 2011 by the surface water flood risk assessment (SWFRA). Through survey responses from local authorities (LAs) and the outcome of workshops with a range of flood professionals, this paper examines the understanding, benefits, limitations and ways to improve the current SWF warning service. The current SWFRA alerts are perceived as useful by district and county LAs, although their understanding of them is limited. The majority of LAs take action upon receipt of SWFRA alerts, and their reactiveness to alerts appears to have increased over the years and as SWFRA superseded ERA. This is a positive development towards increased resilience to SWF. The main drawback of the current service is its broad spatial resolution. Alternatives for providing localised SWF forecast and warnings were analysed, and a two-tier national-local approach, with pre-simulated scenario-based local SWF forecasting and warning systems, was deemed most appropriate by flood professionals given current monetary, human and technological resources.
  • Journal article
    Staffell IL, Bossmann T, 2015,

    The Shape of Future Electricity Demand: Exploring Load Curves in 2050s Germany and Britain

    , Energy, Vol: 90, Pages: 1317-1333, ISSN: 0360-5442

    National demand for electricity follows a regular and predictable daily pattern. This pattern is setto change due to efficiency improvements, de-industrialisation and electrification of heat andtransport. These changes are independent of renewable infeed and are not well understood:contemporary studies assume that electricity load curves will retain their current shape, scalingequally in all hours. Changes to this shape will profoundly affect the electricity industry: increasingthe requirements for flexible and peaking capacity, and reducing asset utilisation and profitability.This paper explores the evolution of load curves to 2050 in Germany and Britain: two countriesundergoing radically different energy transformations. It reviews recent developments in Europe’selectricity demand, and introduces two models for synthesising future hourly load curves: eLOADand DESSTinEE. Both models are applied to a decarbonisation scenario for 2050, and consistentlyshow peak loads increasing by about 23% points above the change in annual demand, to 103 GWin Germany and 92 GW in Britain. Sensitivities around electrification show that a million extra heatpumps or electric vehicles add up to 1.5 GW to peak demand.The structure and shape of the future load curves are analysed, and impacts on the nationalelectricity systems are drawn.
  • Conference paper
    Thomas, 2014,

    GaNAsSb 1-eV solar cells for use in lattice-matched multi-junction architectures

    , 40th IEEE PVSC
  • Journal article
    Cotter CJ, Kirby RC, 2015,

    Mixed finite elements for global tide models

    , Numerische Mathematik, Vol: 133, Pages: 255-277, ISSN: 0945-3245

    We study mixed finite element methods for the linearized rotating shallow water equations with linear drag and forcing terms. By means of a strong energy estimate for an equivalent second-order formulation for the linearized momentum, we prove long-time stability of the system without energy accumulation—the geotryptic state. A priori error estimates for the linearized momentum and free surface elevation are given in L2L2 as well as for the time derivative and divergence of the linearized momentum. Numerical results confirm the theoretical results regarding both energy damping and convergence rates.
  • Journal article
    Lai P, Moulton K, Krevor S, 2015,

    Pore-scale heterogeneity in the mineral distribution and reactive surface area of porous rocks

    , Chemical Geology, Vol: 411, Pages: 260-273, ISSN: 0009-2541

    The reactive surface area is an important control on interfacial processes between minerals and aqueous fluids in porous rocks. Spatial heterogeneity in the surface area can lead to complications in modelling reactive transport processes, but quantitative characterisation of this property has been limited. In this paper 3D images obtained using x-ray micro-tomography were used to characterise heterogeneity in surface area in one sandstone and five carbonate rocks. Measurements of average surface area from x-ray imagery were 1-2 orders of magnitude lower than measurements from nitrogen BET. A roughness factor, defined as the ratio of BET surface area to x-ray based surface area, was correlated to the presence of clay or microporosity. Co-registered images of Berea sandstone from x-ray and energy dispersive spectroscopy imagery were used to guide the identification of quartz, K-feldspar, dolomite, calcite and clays in x-ray images. In Berea sandstone, clay and K-feldspar had higheraverage surface area fractions than their volumetric fractions in the rock. In the Edwards carbonate, however, modal mineral composition correlated with surface area. By sub-sampling digital images, statistical distributions of the surface area were generated at various length scales of subsampling. Comparing these to distributions used in published modelling studies showed that the common practice of leaving surface area and pore volume uncorrelated in a pore has lead to unrealistic combinations of surface area and pore volume in the models. We suggest these models adopt a moderate correlation based on observations. In Berea sandstone, constraining ratios of surface area to pore volume to a range of values between that of quartz-lined and five times that of clay-lined spheres appeared sufficient.
  • Journal article
    Zhang J, Fennell PS, Trusler JPM, 2015,

    Density and Viscosity of Partially Carbonated Aqueous Tertiary Alkanolamine Solutions at Temperatures between (298.15 and 353.15) K

    , Journal of Chemical and Engineering Data, Vol: 60, Pages: 2392-2399, ISSN: 1520-5134

    The density and viscosity of partially carbonatedaqueous solutions of either 2-dimethylaminoethanol or 2-diethylaminoethanolwere measured over a temperature range of (298.15 to353.15) K with alkanolamine mass fractions of 0.15 to 0.45.Correlations were developed to represent the density and viscosityof these solutions as a function of amine concentration, CO2 loading,and temperature. For the density, the correlation represents theexperimental data to within ± 0.2 %, while the viscosity data werecorrelated to within ± 4 %. The data and models reported in thispaper will help facilitate a better understanding of the performance ofthese amines in CO2 capture processes, especially in relation to masstransfer and hydrodynamic calculations.
  • Journal article
    Mukherjee S, Kumar P, Yang A, Fennell Pet al., 2015,

    A systematic investigation of the performance of copper-, cobalt-, iron-, manganese- and nickel-based oxygen carriers for chemical looping combustion technology through simulation models

    , CHEMICAL ENGINEERING SCIENCE, Vol: 130, Pages: 79-91, ISSN: 0009-2509
  • Journal article
    Mazur CM, Brandon, Offer, Contestabileet al., 2015,

    Understanding the drivers of fleet emission reduction activities of the German car manufacturers

    , Environmental Innovation and Societal Transitions, Vol: 16, Pages: 3-21, ISSN: 2210-4224

    The current mobility system, dominated by fossil fuel poweredautomobiles, is under increasing pressure due to its environmentalimpact. To address this issue there is a need for a transitionof the system towards one that is more sustainable, including theintroduction of car technologies that allow a decrease in fuel consumptionand the substitution of fossil fuels as primary energysource. Due to the stability of the current automotive industryand the dominance of the internal combustion engine technology,it is expected that the incumbent firms and their activities willplay a crucial role in the transition. Policy makers have thereforeintroduced a variety of policies to encourage the industry to providesuitable solutions.We have conducted amicro-level analysis of howthe threemain German carmanufacturers have changed their activitiesin the field of low emission vehicle technologies in response tonational/international events and policy making. Our analysis suggeststhat policy makers only have limited influence on the typeof disruptive solution that is chosen by these individual companiesand that activities related to solutions that were not familiar to theindividual car manufacturer were mainly induced by internal or external champions. Still, while the existence of regulatory policiesallowed such activities to succeed, on its own it only encouraged theindustry to work on incremental solutions based upon the knowledgealready possessed.
  • Journal article
    Padzillah MH, Rajoo S, Yang M, Martinez-Botas RFet al., 2015,

    Influence of pulsating flow frequencies towards the flow angle distributions of an automotive turbocharger mixed-flow turbine

    , ENERGY CONVERSION AND MANAGEMENT, Vol: 98, Pages: 449-462, ISSN: 0196-8904
  • Book
    Reich S, Cotter CJ, 2015,

    Probabilistic Forecasting and Bayesian Data Assimilation

    , http://www.cambridge.org/us/academic/subjects/mathematics/computational-science/probabilistic-forecasting-and-bayesian-data-assimilation, Publisher: Cambridge University Press, ISBN: 9781107663916
  • Journal article
    Mueller N, Rojas-Rueda D, Cole-Hunter T, de Nazelle A, Dons E, Gerike R, Goetschi T, Panis LI, Kahlmeier S, Nieuwenhuijsen Met al., 2015,

    Health impact assessment of active transportation: A systematic review

    , Preventive Medicine, Vol: 76, Pages: 103-114, ISSN: 0091-7435

    ObjectiveWalking and cycling for transportation (i.e. active transportation, AT), provide substantial health benefits from increased physical activity (PA). However, risks of injury from exposure to motorized traffic and their emissions (i.e. air pollution) exist. The objective was to systematically review studies conducting health impact assessment (HIA) of a mode shift to AT on grounds of associated health benefits and risks.MethodsSystematic database searches of MEDLINE, Web of Science and Transportation Research International Documentation were performed by two independent researchers, augmented by bibliographic review, internet searches and expert consultation to identify peer-reviewed studies from inception to December 2014.ResultsThirty studies were included, originating predominantly from Europe, but also the United States, Australia and New Zealand. They compromised of mostly HIA approaches of comparative risk assessment and cost–benefit analysis. Estimated health benefit–risk or benefit–cost ratios of a mode shift to AT ranged between − 2 and 360 (median = 9). Effects of increased PA contributed the most to estimated health benefits, which strongly outweighed detrimental effects of traffic incidents and air pollution exposure on health.ConclusionDespite different HIA methodologies being applied with distinctive assumptions on key parameters, AT can provide substantial net health benefits, irrespective of geographical context.
  • Journal article
    Wolf K, Stafoggia M, Cesaroni G, Andersen ZJ, Beelen R, Galassi C, Hennig F, Migliore E, Penell J, Ricceri F, Sorensen M, Turunen AW, Hampel R, Hoffmann B, Kaelsch H, Laatikainen T, Pershagen G, Raaschou-Nielsen O, Sacerdote C, Vineis P, Badaloni C, Cyrys J, de Hoogh K, Eriksen KT, Jedynska A, Keuken M, Kooter I, Lanki T, Ranzi A, Sugiri D, Tsai M-Y, Wang M, Hoek G, Brunekreef B, Peters A, Forastiere Fet al., 2015,

    Long-term Exposure to Particulate Matter Constituents and the Incidence of Coronary Events in 11 European Cohorts

    , EPIDEMIOLOGY, Vol: 26, Pages: 565-574, ISSN: 1044-3983
  • Journal article
    Simoes NUNO, Ochoa Rodriguez SUSANA, Wang LI-PEN, Pina RUI, Sa Marques A, Onof C, Leitao JOAOet al., 2015,

    Stochastic Urban Pluvial Flood Hazard Maps Based upon a Spatial-Temporal Rainfall Generator

    , Water, Vol: 7, Pages: 3396-3406, ISSN: 2073-4441
  • Journal article
    Culley DM, Funke SW, Kramer SC, Piggott MDet al., 2015,

    Integration of cost modelling within the micro-siting design optimisation of tidal turbine arrays

    , Renewable Energy, Vol: 85, Pages: 215-227, ISSN: 1879-0682

    The location of individual turbines within a tidal current turbine array – micro-siting – can have a significant impact on the power that the array may extract from the flow. Due to the infancy of the industry and the challenges of exploiting the resource, the economic costs of realising industrial scale tidal current energy projects are significant and should be considered as one of the key drivers of array design. This paper proposes a framework for the automated design of tidal current turbine arrays in which costs over the lifespan of the array may be modelled and considered as part of the design optimisation process. To demonstrate this approach, the cost of sub-sea cabling is incorporated by implementing a cable-routing algorithm alongside an existing gradient-based array optimisation algorithm. Three idealised test scenarios are used to demonstrate the effects of a financial-return optimising design approach as contrasted with a power maximisation approach.
  • Journal article
    Milner-Gulland EJ, Wallace A, Bunnefeld N, Jones JPG, Young R, Nicholson Eet al., 2015,

    Quantifying the short-term costs of conservation interventions for fishers at Lake Alaotra, Madagascar

    , PLOS One, Vol: 10, ISSN: 1932-6203

    Artisanal fisheries are a key source of food and income for millions of people, but if poorly managed, fishing can have declining returns as well as impacts on biodiversity. Management interventions such as spatial and temporal closures can improve fishery sustainability and reduce environmental degradation, but may carry substantial short-term costs for fishers. The Lake Alaotra wetland in Madagascar supports a commercially important artisanal fishery and provides habitat for a Critically Endangered primate and other endemic wildlife of conservation importance. Using detailed data from more than 1,600 fisher catches, we used linear mixed effects models to explore and quantify relationships between catch weight, effort, and spatial and temporal restrictions to identify drivers of fisher behaviour and quantify the potential effect of fishing restrictions on catch. We found that restricted area interventions and fishery closures would generate direct short-term costs through reduced catch and income, and these costs vary between groups of fishers using different gear. Our results show that conservation interventions can have uneven impacts on local people with different fishing strategies. This information can be used to formulate management strategies that minimise the adverse impacts of interventions, increase local support and compliance, and therefore maximise conservation effectiveness.
  • Journal article
    Milner-Gulland EJ, mcnamara J, rowcliffe M, cowlishaw G, kusimi Jet al., 2015,

    Long-term spatio-temporal changes in a West African bushmeat trade system

    , Conservation Biology, Vol: 29, Pages: 1446-1457, ISSN: 0888-8892

    Landscapes in many developing countries consist of a heterogeneous matrix of mixed agriculture and forest. Many of the generalist species in this matrix are increasingly traded in the bushmeat markets of West and Central Africa. However, to date there has been little quantification of how the spatial configuration of the landscape influences the urban bushmeat trade over time. As anthropogenic landscapes become the face of rural West Africa, understanding the dynamics of these systems has important implications for conservation and landscape management. The bushmeat production of an area is likely to be defined by landscape characteristics such as habitat disturbance, hunting pressure, level of protection, and distance to market. We explored (SSG, tense) the role of these four characteristics in the spatio-temporal dynamics of the commercial bushmeat trade around the city of Kumasi, Ghana, over 27 years (1978 to 2004). We used geographic information system methods to generate maps delineating the spatial characteristics of the landscapes. These data were combined with spatially explicit market data collected in the main fresh bushmeat market in Kumasi to explore the relationship between trade volume (measured in terms of number of carcasses) and landscape characteristics. Over time, rodents, specifically cane rats (Thryonomys swinderianus), became more abundant in the trade relative to ungulates and the catchment area of the bushmeat market expanded. Areas of intermediate disturbance supplied more bushmeat, but protected areas had no effect. Heavily hunted areas showed significant declines in bushmeat supply over time. Our results highlight the role that low intensity, heterogeneous agricultural landscapes can play in providing ecosystem services, such as bushmeat, and therefore the importance of incorporating bushmeat into ecosystem service mapping exercises. Our results also indicate that even where high bushmeat production is possible, current harvest levels may
  • Book
    Haigh JD, Cargill P, 2015,

    The Sun's Influence on Climate

    , ISBN: 9780691153841

    "--Peter Pilewskie, University of Colorado Boulder "This succinct volume will be invaluable to scientists and general readers who want to learn more about the Sun and its effects on our climate system.
  • Journal article
    Field KJ, Pressel S, Duckett JG, Rimington WR, Bidartondo MIet al., 2015,

    Symbiotic options for the conquest of land

    , Trends in Ecology & Evolution, Vol: 30, Pages: 477-486, ISSN: 0169-5347

    The domination of the landmasses of Earth by plants starting during the Ordovician Period drastically altered the development of the biosphere and the composition of the atmosphere, with far-reaching consequences for all life ever since. It is widely thought that symbiotic soil fungi facilitated the colonization of the terrestrial environment by plants. However, recent discoveries in molecular ecology, physiology, cytology, and paleontology have brought into question the hitherto-assumed identity and biology of the fungi engaged in symbiosis with the earliest-diverging lineages of extant land plants. Here, we reconsider the existing paradigm and show that the symbiotic options available to the first plants emerging onto the land were more varied than previously thought.
  • Journal article
    Thomas T, Mellor A, Hylton NP, Fuehrer M, Alonso-Alvarez D, Braun A, Ekins-Daukes NJ, David JPR, Sweeney SJet al., 2015,

    Requirements for a GaAsBi 1 eV sub-cell in a GaAs-based multi-junction solar cell

    , Semiconductor Science and Technology, Vol: 30, ISSN: 1361-6641
  • Conference paper
    Abolghasemi M, Piggott MD, Spinneken J, Vire A, Cotter CJ, Crammond Set al., 2015,

    Simulating tidal turbines with mesh optimisation and RANS turbulence models

    , 2015 European Wave and Tidal Energy Conference
  • Book chapter
    Hawkes A, Hanna R, 2015,

    Market and policy influences

    , Domestic Microgeneration Renewable and Distributed Energy Technologies, Policies and Economics, Publisher: Routledge, ISBN: 9781317448853

    Renewable and Distributed Energy Technologies, Policies and Economics Iain Staffell, Daniel J.L. Brett, Nigel P. Brandon, Adam D. Hawkes. [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28] [29] [30] [31] [32] [33] [34] [35] [36] ...
  • Journal article
    Nako AE, White AJ, Crimmin MR, 2015,

    Bis(σ-B-H) complexes of copper(i): precursors to a heterogeneous amine-borane dehydrogenation catalyst

    , Dalton Transactions, Vol: 44, Pages: 12530-12534, ISSN: 1477-9226

    A series of bis(σ-B-H) complexes of copper(i) have been prepared by displacement of arene solvent from a β-diketiminate copper(i) complex by four-coordinate boranes, H3B-L (L = NMe3, lutidine). In the presence of the same copper arene complex, the secondary amine-borane H3B-NMe2H undergoes dehydrogenation. We provide evidence for formation of a heterogengous catalyst from decomposition of the solution species.
  • Journal article
    Blamey J, Manovic V, Anthony EJ, Dugwell DR, Fennell PSet al., 2015,

    On steam hydration of CaO-based sorbent cycled for CO2 capture

    , FUEL, Vol: 150, Pages: 269-277, ISSN: 0016-2361
  • Conference paper
    Khairuddin U, Costall AW, Martinez-Botas RF, 2015,

    INFLUENCE OF GEOMETRICAL PARAMETERS ON AERODYNAMIC OPTIMIZATIONOF A MIXED-FLOW TURBOCHARGER TURBINE

    , ASME Turbo Expo 2015: Turbine Technical Conference and Exposition, Publisher: ASME

    This paper describes an optimization procedure to modify the geometry of a mixed-flow turbocharger turbine for improved aerodynamic efficiency. The procedure integrates parameterization of the turbine blade geometry, genetic algorithm optimization, and 3D CFD analysis using a commercial solver.Using a known mixed-flow turbocharger turbine as the baseline, the main features of the blade geometry — the hub, shroud, camberline, leading and trailing edge profiles—were separately adjusted by the genetic algorithm in the direction of better efficiency. Apart from optimizing the subject turbine for the operating point in question, more usefully this permits each geometrical feature to be ranked by their contribution to the change in efficiency. Cases were also run in which the hub and shroud curves were simultaneously adjusted. Analysis of CFD results provides additional insight into the underlying reasons for efficiency changes by examination of the relevant flow field features.The hub and shroud profiles were observed to have the greatest impact on turbine performance, optimization of which leads to an increase of 1.3 percentage points of efficiency. This compares to only 0.2 percentage points improvement following optimization of the outlet geometry.
  • Journal article
    Duboviks V, Lomberg M, Maher RC, Cohen LF, Brandon NP, Offer GJet al., 2015,

    Carbon deposition behaviour in metal-infiltrated gadolinia doped ceria electrodes for simulated biogas upgrading in solid oxide electrolysis cells

    , Journal of Power Sources, Vol: 293, Pages: 912-921, ISSN: 1873-2755

    One of the attractive applications for reversible Solid Oxide Cells (SOCs) is to convert CO2 into CO via high temperature electrolysis, which is particularly important for biogas upgrading. To improve biogas utility, the CO2 component can be converted into fuel via electrolysis. A significant issue for SOC operation on biogas is carbon-induced catalyst deactivation. Nickel is widely used in SOC electrodes for reasons of cost and performance, but it has a low tolerance to carbon deposition. Two different modes of carbon formation on Ni-based electrodes are proposed in the present work based on ex-situ Raman measurements which are in agreement with previous studies. While copper is known to be resistant towards carbon formation, two significant issues have prevented its application in SOC electrodes – namely its relatively low melting temperature, inhibiting high temperature sintering, and low catalytic activity for hydrogen oxidation. In this study, the electrodes were prepared through a low temperature metal infiltration technique. Since the metal infiltration technique avoids high sintering temperatures, Cu–Ce0.9Gd0.1O2−δ (Cu-CGO) electrodes were fabricated and tested as an alternative to Ni-CGO electrodes. We demonstrate that the performance of Cu-CGO electrodes is equivalent to Ni-CGO electrodes, whilst carbon formation is fully suppressed when operated on biogas mixture.
  • Journal article
    Buytaert W, Almeida S, le vine N, mcintyre N, wagener Tet al., 2015,

    Accounting for dependencies in regionalized signatures for predictions in ungauged catchments

    , Hydrology and Earth System Sciences Discussions, Vol: 12, Pages: 5389-5426, ISSN: 1812-2116

    A recurrent problem in hydrology is the absence of streamflow data to calibrate rainfall-runoff models. A commonly used approach in such circumstances conditions model parameters on regionalized response signatures. While several different signatures are often available to be included in this process, an outstanding challenge is the selection of signatures that provide useful and complementary information. Different signatures do not necessarily provide independent information, and this has led to signatures being omitted or included on a subjective basis. This paper presents a method that accounts for the inter-signature error correlation structure so that regional information is neither neglected nor double-counted when multiple signatures are included. Using 84 catchments from the MOPEX database, observed signatures are regressed against physical and climatic catchment attributes. The derived relationships are then utilized to assess the joint probability distribution of the signature regionalization errors that is subsequently used in a Bayesian procedure to condition a rainfall-runoff model. The results show that the consideration of the inter-signature error structure may improve predictions when the error correlations are strong. However, other uncertainties such as model structure and observational error may outweigh the importance of these correlations. Further, these other uncertainties cause some signatures to appear repeatedly to be disinformative.
  • Journal article
    Shin HH, Cohen AJ, Pope CA, Ezzati M, Lim SS, Hubbell BJ, Burnett RTet al., 2015,

    Meta-Analysis Methods to Estimate the Shape and Uncertainty in the Association Between Long-Term Exposure to Ambient Fine Particulate Matter and Cause-Specific Mortality Over the Global Concentration Range

    , RISK ANALYSIS, Vol: 36, Pages: 1813-1825, ISSN: 0272-4332
  • Journal article
    Wang L-P, Ochoa-Rodríguez S, Van Assel J, Pina RD, Pessemier M, Kroll S, Willems P, Onof Cet al., 2015,

    Enhancement of radar rainfall estimates for urban hydrology through optical flow temporal interpolation and Bayesian gauge-based adjustment

    , Journal of Hydrology, Vol: 531, Pages: 408-426, ISSN: 0022-1694

    Rainfall estimates of the highest possible accuracy and resolution are required for urban hydrological applications, given the small size and fast response which characterise urban catchments. While radar rainfall estimates have the advantage of well capturing the spatial structure of rainfall fields and its variation in time, the commonly available radar rainfall products (typically at ∼1 km/5–10 min resolution) may still fail to satisfy the accuracy and resolution – in particular temporal resolution – requirements of urban hydrology. A methodology is proposed in this paper, to produce higher temporal resolution, more accurate radar rainfall estimates, suitable for urban hydrological applications. The proposed methodology entails two main steps: (1) Temporal interpolation of radar images from the originally-available temporal resolutions (i.e. 5–10 min) to finer resolutions at which local rain gauge data are commonly available (i.e. 1–2 min). This is done using a novel interpolation technique, based upon the multi-scale variational optical flow technique, and which can well capture the small-scale rainfall structures relevant at urban scales. (2) Local and dynamic gauge-based adjustment of the higher temporal resolution radar rainfall estimates is performed afterwards, by means of the Bayesian data merging method. The proposed methodology is tested using as case study a total of 8 storm events observed in the Cranbrook (UK) and Herent (BE) urban catchments, for which radar rainfall estimates, local rain gauge and depth/flow records, as well as recently calibrated urban drainage models were available. The results suggest that the proposed methodology can provide significantly improved radar rainfall estimates and thereby generate more accurate runoff simulations at urban scales, over and above the benefits derived from the mere application of Bayesian merging at the original temporal resolution at which radar estimates are available
  • Journal article
    Andersen ZJ, de Nazelle A, Mendez MA, Garcia-Aymerich J, Hertel O, Tjonneland A, Overvad K, Raaschou-Nielsen O, Nieuwenhuijsen MJet al., 2015,

    A study of the combined effects of physical activity and air pollution on mortality in elderly urban residents: the Danish diet, cancer, and health cohort

    , Environmental Health Perspectives, Vol: 123, Pages: 557-563, ISSN: 1552-9924

    Background: Physical activity reduces, whereas exposure to air pollution increases, the risk of premature mortality. Physical activity amplifies respiratory uptake and deposition of air pollutants in the lung, which may augment acute harmful effects of air pollution during exercise.Objectives: We aimed to examine whether benefits of physical activity on mortality are moderated by long-term exposure to high air pollution levels in an urban setting.Methods: A total of 52,061 subjects (50–65 years of age) from the Danish Diet, Cancer, and Health cohort, living in Aarhus and Copenhagen, reported data on physical activity in 1993–1997 and were followed until 2010. High exposure to air pollution was defined as the upper 25th percentile of modeled nitrogen dioxide (NO2) levels at residential addresses. We associated participation in sports, cycling, gardening, and walking with total and cause-specific mortality by Cox regression, and introduced NO2 as an interaction term.Results: In total, 5,534 subjects died: 2,864 from cancer, 1,285 from cardiovascular disease, 354 from respiratory disease, and 122 from diabetes. Significant inverse associations of participation in sports, cycling, and gardening with total, cardiovascular, and diabetes mortality were not modified by NO2. Reductions in respiratory mortality associated with cycling and gardening were more pronounced among participants with moderate/low NO2 [hazard ratio (HR) = 0.55; 95% CI: 0.42, 0.72 and 0.55; 95% CI: 0.41, 0.73, respectively] than with high NO2 exposure (HR = 0.77; 95% CI: 0.54, 1.11 and HR = 0.81; 95% CI: 0.55, 1.18, p-interaction = 0.09 and 0.02, respectively).Conclusions: In general, exposure to high levels of traffic-related air pollution did not modify associations, indicating beneficial effects of physical activity on mortality. These novel findings require replication in other study populations.
  • Journal article
    Thuburn J, Cotter CJ, 2015,

    A primal-dual mimetic finite element scheme for the rotating shallow water equations on polygonal spherical meshes

    , JOURNAL OF COMPUTATIONAL PHYSICS, Vol: 290, Pages: 274-297, ISSN: 0021-9991

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