1401 research outputs found
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Data associated with 'Nucleation of nitric acid hydrates in Polar Stratospheric Clouds by meteoric material'
No full textHeterogeneous nucleation of crystalline nitric acid hydrates in Polar Stratospheric Clouds (PSCs) enhances ozone depletion. However, the identity and mode of action of the particles responsible for nucleation remains unknown. It has been suggested that meteoric material may trigger nucleation of nitric acid trihydrate (NAT; or other nitric acid phases), but this has never been directly demonstrated in the laboratory. Meteoric material is present in two forms in the stratosphere, smoke which results from the ablation and re-condensation of vapours, and fragments which result from the disruption of meteoroids entering the atmosphere. This data and accompanying study show that analogues of both materials have a capacity to nucleate nitric acid hydrates. In combination with estimates from a global model of the amount of meteoric smoke and fragments in the polar stratosphere the data shows that meteoric material probably accounts for NAT observations in early season polar stratospheric clouds in the absence of water ice
11 year solar cycle ozone coefficients from CMIP6 ozone dataset presented in ‘The representation of solar cycle signals in stratospheric ozone. Part II: Analysis of global models'
No full textMonthly and zonal mean coefficients for the 11 year solar cycle effect on stratospheric ozone derived from the CMIP6 ozone dataset. The coefficients are provided on a 3-D (latitude-pressure-month) grid and are derived using multiple linear regression of ozone against either: (1) the F10.7cm solar radio flux (cmip6_solar-o3_coeffs_per_SFU.nc); and (2) the 200-320 nm integrated spectral solar irradiance (cmip6_solar-o3_coeffs_per_Wm-2.nc) for the period 1960-2011. The coefficients are provided in terms of both % and mol mol-1 of ozone change. Also included are p-values for the ozone coefficients as a function of latitude-pressure-month. The dataset is provided in NetCDF format
Painting the Sea
No full textThis digital reflection video, edited in January 2016, shows the rhythmic engagement of the artist's body with the material tools of artmaking in the painting of the sea. It is referred to in Chapter Three of the the practice-led PhD project Painting as Emergent Knowledge
Seals
No full textFrom phase three of the practice-led research project Painting as Emergent Knowledge. Referred to in Chapter Five. This was shown in 'The Garden of Earthly Delights'
Strain and domain wall creep in Pt-Co-Ir thin films
No full textWe study the energy and creep velocity of magnetic domain walls in perpendicularly magnetised Pt/Co/Ir thin films under strain. We find that the enhancement of domain wall creep velocity under strain from piezoelectric transducers is largest in films with the thinnest Co layers (0.56 nm), in which the strain causes the smallest relative change in perpendicular magnetic anisotropy and the largest relative change in domain wall creep velocity. We show how domain wall energy is predictive of the sensitivity of domain wall creep velocity to changes in strain, and thus provide a route to designing magnetic thin film systems for optimum strain control
Data associated with 'Continuous frequency tuning with near constant output power in coupled Y-branched terahertz quantum cascade lasers with photonic lattice'
No full textWe demonstrate continuous frequency tuning in terahertz quantum cascade lasers with double metal waveguides using a Y-branched coupler. Two THz QCLs placed side-by-side couple by evanescent fields across the air gap between them. Each QCL waveguide comprises a 48-μm-wide coupler and S-bend section, which are connected to an 88-μm-wide Y-branch through an impedance matching ta-pered section. Photonic lattices are patterned on top of the coupler section in each QCL using focused ion-beam milling to control the spec-tral characteristics. The waveguide design used for individual QCL sections is optimized using finite element modelling and the spectral char-acteristics are modelled using a transfer matrix model. Continuous frequency tuning of ~19 GHz is demonstrated while maintaining an out-put power of ~4.2–4.8 mW and a heat sink temperature of 50 K. The tuning is controlled electrically through Stark shift and cavity pulling effects by driving both QCLs simultaneously and represents widest electrically-controlled monolithic continuous tuning performance from a THz QCL
Climate model data presented in 'Climatic effect of Antarctic meltwater overwhelmed by concurrent Northern hemispheric melt'
No full textThis figure from Climatic Effect of Antarctic Meltwater Overwhelmed by Concurrent Northern Hemispheric Melt shows simulated surface air temperature anomalies from background (14.8 ka).
The underlying data is available as 5 discrete datasets from the 'Related resources' links or from the Collection link at the top of this record
Identifying North Africans in the French Internal Resistance
No full textExcel spreadsheet giving names, dates of birth, place of birth (town, country), GR16P file numbers for North African members of the French Internal Resistance (http://www.servicehistorique.sga.defense.gouv.fr/?q=content/dossiers-administratifs-de-r%C3%A9sistants
Climate model data presented in 'Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation': routed_meltwater
No full textThis dataset contains output from a set of two published global climate simulations that investigate the role of ice sheet melting in the onset of Heinrich Stadial 1 ocean circulation and climate changes ~18.5 thousand years ago. The simulations were run with the HadCM3 general circulation model at the University of Leeds. Here, the simulations are named 'lgm_control' (set up to simulate the climate of 21 ka) and 'hs1', which is the simulation presented in the associated manuscript: Ivanovic, R. F., Gregoire, L. J., Burke, A., Wickert, A. D., Valdes, P. J., Ng, H. C., et al. (2018). Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation. Paleoceanography and Paleoclimatology. https://doi.org/10.1029/2017PA003308. The hs1 simulation is the same as lgm_control, but it also includes a transient ice meltwater flux to the ocean derived from the ICE-6G_C global ice sheet history. The data is provided in NETCDF3 format within zipped directories corresponding to the two simulations and the routing of ICE-6G_C meltwater. For each simulation, we provide the freshwater forcing files (i.e. model input) and model output. Model output is provided as time-series for a range of ocean, atmosphere and vegetation data. See the accompanying README.txt for a list of supplied output variables as well as more information on the directory structure for the data
myPAL Co-design Phase 1 Visualisations
Get PDFThis set of visualisations were created by students and tutors who took part in the phase 1 co-design as part of the HEFCE-funded myPAL@work project. The pictures are their ideas for how to better visualise their learning data (mainly workplace based learning assessments but also summative assessments) in the myPAL system in order to help them to review and manage their learning more effectively. The spreadsheet is the initial analysis undertaken by the myPAL management team (dataset creators) of these visualisations, in which the visualisations were first reviewed overall to identify the types of question that were being asked/answered and then each individual visualisation was tagged with the main (and secondary) questions that the management group felt it was answering. The management group’s review and decisions were also influenced by their knowledge of the discussion in the co-design workshops (four of the group had been workshop facilitators) and the transcripts of those discussions