10,058 Works

UK Domestic Appliance Level Electricity (UK-DALE) - High speed (16 kHz) aggregated whole house current/voltage

Jack Kelly

EMP generated by high intensity ultrashort laser-solid interaction on the Vulcan Petawatt Data set

David Carroll, Margaret Read, Matthew Selwood, Graeme Scott & David Neely
The data provide is that used while generating a time-frequecny analysis method for EMP (electromagnetic pulses ) generated from a high intensity laser-solid interaction. The data set includes additional data where the parameters of the laser are varied. This data is voltage-time oscilloscope traces from Moebius loops, which respond to the rate of change of magnetic field, and are the same as used by M.J. Mead et al (Rev. Sci. Instru. Vol75, pp4225-4227, 2004) and...

IG2 Transmission Grating - 3 um - Fourier Transform Spectrometer spectral transmission measurement

Helen Butcher, Damien Weidmann, Richard Brownsword, David Lee, Robert Thomson & David Maclachlan
These data were obtained in August 2016 using the Bruker Vertex 80v Fourier Transform Spectrometer in the High-resolution Spectroscopy facility, RAL Space, Rutherford Appleton Laboratory, UK. The spectrometer was configured using the mid-infrared glowbar broadband source, with optical data collected over 1.5-6 um. The beamsplitter was KBr, and the detector was nitrogen cooled HgCdTe. The double-sided interferogram was defined to run from 0.25 cm-1 to 15000 cm-1. The resolution was 0.5 cm-1. The pinhole size...

Generalised Jones matrix method for off-axis propagation of 3D polarised light through anisotropic media - dataset

Mariastefania De Vido
This dataset gathers theoretical analysis and experimental results on a number of anisotropic materials. Materials considered are sapphire, exhibiting uniaxial linear birefringence, topaz, exhibiting biaxial linear birefringence, and crystalline quartz, exhibiting both uniaxial linear birefringence and optical activity. The data relate to a set of experiments aimed at verifying a novel generalised analytical method for describing the effect of anysotropic materials on polarised light propagating at arbitrary angles with respect to the optic axes of...

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Data used in the manuscript “Cherenkov radiation-based optical fibre diagnostics of fast electrons generated in intense laser-plasma interactions”

Hao Liu, Guo-Qian Liao, Yi-Hang Zhang, Bao-Jun Zhu, Zhe Zhang, Yu-Tong Li, Graeme G. Scott, Dean Rusby, Chris Armstrong, Egle Zemaityte, David C. Carroll, Sam Astbury, Phill Bradford, Nigel Woolsey, Paul McKenna & David Neely
The data is from fiber Cerenkov diagnostics, which is taken in intense laser-plasma interactions experiments. This work has been illustrated in the paper “Cherenkov radiation-based optical fibre diagnostics of fast electrons generated in intense laser-plasma interactions”. The data is taken to prove that it is valid to use optical fiber to measure fast electrons generated in intense laser-plasma interactions. The creation method and description of the data can be find in the manuscript.

Neutron diffraction for non-destructive evaluation of composition and microstructure in highly heterogeneous ancient steel from Mongolia

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Recent analytical research on ancient metal objects recovered in Mongolia revealed that the early bronze and iron-making technologies can be clearly differentiated from those practiced in contemporaneous China. The nomadic life style of Mongolian population was not compatible with the production of large size artistic artefacts, typical of urban centres, therefore they developed a tradition of production of high quality transportable small size artistic objects.Iron artefacts recovered in Mongolia often display evidence of small-scale engineering...

Do cardiolipins play a role for the mode of action of antimicrobial peptides? A study using free floating lipid model membranes

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Antimicrobial peptides (AMPs), also called host defense peptides, are part of the innate immune system of essentially all species, from bacteria themselves to mammals to protect against bacterial pathogens. Although the exact microscopic mechanism(s) is still debated, this chemical structure allows them to target bacterial cell membranes which have net negative charge, selectively. One hypotheses of the mode of action is that AMPs interacts with cardiolipins (CL), and important anionic lipid present in bacterial membranes...

Unravelling the source of anomalously large spin Seebeck effect in Fe3O4:Pt bilayer thin films

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The spin Seebeck effect is a newly discovered phenomenon that if harnessed, could result in a significant improvement of the efficiency of thermoelectric energy generators. Spin polarised neutron reflectivity, with the addition of the off-specular information provided by the OSMOND detector, will provide us with complementary measurements that enable determination of the spin polarisation of the film as well as surface morphology at the interface. This is especially important as the influence of the interface...

Unravelling the source of anomalously large spin Seebeck effect in Fe3O4:Pt bilayer thin films

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The spin Seebeck effect is a newly discovered phenomenon that if harnessed, could result in a significant improvement of the efficiency of thermoelectric energy generators. Spin polarised neutron reflectivity, with the addition of the off-specular information provided by the OSMOND detector, will provide us with complementary measurements that enable determination of the spin polarisation of the film as well as surface morphology at the interface. This is especially important as the influence of the interface...

Correlations between crystallographic distributions and mobility of oxide ions in Ba3NbWO8.5

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Oxide ion conductors have been a focus of intense research due to their application as electrolytes in solid oxide fuel cells (SOFCs), devices intended to allow the safe utilisation of hydrogen fuel for energy. Ba3NbMoO8.5 is a pure oxide ion conductor with competitive conductivity at "moderate" operating temperatures, but its highly disordered crystal structure is not well understood. We will use single-crystal neutron diffraction to examine the distributions of oxide ions in the structure as...

SEE response evaluation of robotic systems for the nuclear decommissionning

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With many nuclear power plants coming to the end of their life, the nuclear Decontamination and Decommissioning process needs: cost effective, environmentally friendly and low human risk solutions. A steadily increasing research field is targeting many of the challenges around the D&D such as the inspection of areas that are subjected to ionizing radiation, as well the sorting of the nuclear waste. The experimental campaign that we propose in this request for beam time is...

Study of spin-phonon coupling to understand the multiferroic properties of polar magnetic oxides DyMWO6 (M = Cr, Fe) using Inelastic Neutron

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Polar magnets, an interesting family of compounds both fundamentally and technologically as they exhibit rich variety properties such as magnetism, ferroelectricity, pyroelectricity, magnetodielectric/electric effect, and multiferroicity. Recently, we reported new polar magnets DyMWO6 (M = Cr, Fe) crystallize in orthorhombic structure with space group Pna21 exhibit interesting magnetic and magnetoelectric properties. DyFeWO6 compound shows spin induced multiferroicity whereas DyCrWO6, not a multiferroic. However, the origin of the interplay between magnetism and ferroelectricity remains unsolved in...

Can identical crystals melt into two distinct liquids?

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Seemingly identical molecular crystals of acetaldehyde phenylhydrazone (APH), C8H10N2, are reported to melt to liquids with distinctly different structures, and with different melting points of between 60 and 100 C. The low- or high-melting forms can be reliably prepared by exposure of crystals to trace acid or base (as little as 1/1000th molar equivalent) respectively, with no detectable change to the crystal structure. Although rare, this remarkable and strange behavior demands further investigation. It has...

Magnetic field effect on low-energy spin excitations in a novel quantum spin liquid candidate

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We plan to study the effect of magnetic field on the spin excitations in the newly discovered quantum spin liquid Na2BaCo(PO4)2. Our preliminary inelastic neutron scattering measurements on the powder sample reveals that the spin-excitation is continuum-type at base T (1K) without external field, with band-width in the order of 0.1 to 0.2 meV. With a large enough field above the critical value (Hc ~ 2T), the energy of the spin excitations is lifted. Most...

PERFECTA – A Superfluorinated Molecular Probe for MRI

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Magnetic resonance imaging (MRI) has had a transformative effect in modern medicine. A hot-spot imaging technique utilises another nucleus (such as 19F) to provide a second coloured layer, information which is independent to the anatomical details provided by the grey-scale proton NMR image. PERFECTA is a contrast agent which contains 36 equivalent 19F atoms and shows a single intense resonance peak. It is very stable and is easily synthesised using a one-step reaction. The hydrocarbon...

Using Neutron Tomography to study aqueous alteration processes on Mars

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Understanding the fluid pathways and timing(s) of fluid flow within Martian meteorites is critical to our understanding of the nature and origin of water at or near the red planet’s surface. Elucidating Mars’ aqueous past is critical to major questions on past or current habitable environments on Mars and the investigation of rocks and minerals formed through aqueous processes is a key driver for ESA and NASA robotic exploration missions. Neutron tomography’s sensitivity to hydrous...

Low-energy spin excitations in Ni over-doped NaFe0.7Ni0.3As

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The discovery of iron-based superconductors gives a new horizon to study unconventional superconductivity. Typically iron-based superconductors can be created by doping (i.e. replace Fe ions with) Co or Ni in some parent compounds such as NaFeAs. It is believed the magnetism in these materials is strongly coupled to superconductivity. One way to probe the magnetism in these materials is to observe the spin gap by inelastic neutron scattering. Our previous experiment shows no gap for...

Measurement of Reference Cross Sections of Li-ion Battery Materials via Energy Selective Neutron Imaging

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We would like to measure the reference cross sections of lithium-ion battery (LIB) materials. This is the first step of a project that will serve as a baseline to understand the transport limiting mechanisms that are on of the main reasons for capacity losses in LIBs. This technique has been used with 6-Li and 2-H isotopes, since they have a greater attenuation than their natural homologous. Here we would like to prove that energy selective...

uSR study of low temperature magnetism in Li NMC 811

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LiNi0.8Mn0.1Co0.1O2 (Li NMC 811) is a next generation Li ion battery cathode material. We are investigating the magnetic properties of Li NMC 811 to track the changes in local ordering of the magnetic ions and changes in oxidation state as a function of electrochemical cycling. Here we focus on pristine Li NMC 811 which contains S=1/2 Ni3+, S=1 Ni2+, S=3/2 Mn4+ and S=0 Co3+. In addition it is prone to off-stoichiometry and Li/Ni site disorder...

The structure of ruthenium pentacarbonyl: comparison to iron pentacarbonyl

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Of the metal carbonyls, iron pentacarbonyl, Fe(CO)5, is iconic: it was first reported in 1891 and was only the second metal carbonyl to be discovered, the structure is that of a trigonal bipyramid. There is no neutron diffraction data for Fe(CO)5. The only characterisation of the ruthenium congener of Fe(CO)5, Ru(CO)5, is a gas phase electron diffraction structure and infrared spectra in the C≡O stretch region. We propose to carry out the first structural and...

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