241 Works

Stability and Metastability of Skyrmions in Thin Lamella of Cu2OSeO3 [dataset]

M.N. Wilson, M.T. Birch, A. Štefančič, A.C. Twitchett-Harrison, G. Balakrishnan, T.J. Hicken, R. Fan, P. Steadman & P.D. Hatton
We report small angle X-ray scattering (SAXS) measurements of the skyrmion lattice in two 200 nm thick Cu2OSeO3 lamellae aligned with the applied magnetic field parallel to the out of plane [110] or [100] crystallographic directions. Our measurements show that the equilibrium skyrmion phase in both samples is expanded significantly compared to bulk crystals, existing between approximately 30 and 50~K over a wide region of magnetic field. This skyrmion state is elliptically distorted at low...

Measuring the Formation Energy Barrier of Skyrmions in Zinc Substituted Cu2OSeO3 [dataset]

Murray N. Wilson, Marta Crisanti, Christopher Barker, Aleš Štefančič, Jonathan S. White, Max T. Birch, Geetha Balakrishnan, Robert Cubitt & Peter D. Hatton
We report small angle neutron scattering (SANS) measurements of the skyrmion lattice in (Cu0.976Zn0.024)2OSeO3 under the application of electric and magnetic fields. These measurements show an expansion of the skyrmion lattice stability region with electric field. Furthermore, using time-resolved SANS, we observe the slow formation of skyrmions after an electric or magnetic field is applied, which has not been observed in pristine Cu2OSeO3 crystals. The measured formation times are dramatically longer than the corresponding skyrmion...

Ultracold collisions of Cs in excited hyperfine and Zeeman states [dataset]

Matthew D. Frye
We investigate Cs+Cs scattering in excited Zeeman and hyperfine states. We calculate the real and imaginary parts of the s-wave scattering length; the imaginary part directly provides the rate coefficient for 2-body inelastic loss, while the real part allows us to identify regions of magnetic field where 3-body recombination will be slow. We identify field regions where Cs in its (f,mf)=(3,+2) and (3,+1) states may be stable enough to allow Bose-Einstein condensation, and additional regions...

Research data for "Testing the limits of NMR crystallography: the case of caffeine–citric acid hydrate"

Hannah E. Kerr
The crystal structure of a new 1:2 caffeine-citric acid hydrate cocrystal is presented. The caffeine molecules are disordered over two positions, with the nature of the disorder confirmed to be static by 13C solid-state NMR. NMR linewidths in statically disordered systems reflect the distribution of local chemical environments, and this study investigates whether the disorder contribution to 13C linewidths can be predicted computationally. The limits of NMR crystallography calculations using density functional theory are tested...

Controlling fragment competition on pathways to addressable self-assembly [dataset]

Jim Madge, Mark A. Miller & David Bourne
Addressable self-assembly is the formation of a target structure from a set of unique molecular or colloidal building-blocks, each of which occupies a defined location in the target. The requirement that each type of building-block appears exactly once in each copy of the target introduces severe restrictions on the combinations of particles and on the pathways that lead to successful self-assembly. These restrictions can limit the efficiency of self-assembly and the final yield of the...

NURBS plasticity: non-associated plastic flow [figure data]

W.M. Coombs & Y. Ghaffari Motlagh
This paper extends the non-uniform rational basis spline (NURBS) plasticity frame- work of Coombs et al. [11] and Coombs and Ghaffari Motlagh [10] to include non-associated plastic flow. The NURBS plasticity approach allows any smooth isotropic yield envelope to be represented by a NURBS surface whilst the numerical algorithm (and code) remains unchanged. This paper provides the full theoretical and algorithmic basis of the non-associated NURBS plasticity approach and demonstrates the predictive capability of the...

Ultra-high speed Terahertz imaging using atomic vapour [dataset]

Lucy Alexandra Downes, Kevin John Weatherill, Andrew Rae MacKellar, Daniel James Whiting, Charles S. Adams & Cyril Bourgenot

Generator Rotor Electrical Asymmetry Test Rig Experiments [dataset]

Donatella Zappalá
This paper presents a simplified automated fault detection scheme for wind turbine induction generators with rotor electrical asymmetries. Fault indicators developed in previous works have made use of the presence of significant spectral peaks in the upper sidebands of the supply frequency harmonics; however, the specific location of these peaks may shift depending on the wind turbine speed. As wind turbines tend to operate under variable speed conditions, it may be difficult to predict where...

B-spline based boundary conditions in the material point method [figure data]

Yun Bing
The material point method is an increasingly popular method for tackling solid mechanics problems involving large deformations. However, there are issues associated with applying boundary conditions in the method and, to date, no general approach for imposing both Neumann and Dirichlet boundary conditions has been proposed. In this paper, a new B-spline based boundary method is developed as a complete methodology for boundary representation, boundary tracking and boundary condition imposition in the standard material point...

iGIMP: An implicit generalised interpolation material point method for large deformations (figure data)

T.J. Charlton, W.M. Coombs & C.E. Augarde
The Material Point Method (MPM) uses a combined Eulerian-Lagrangian approach to solve problems involving large deformations. A problem domain is discretised as material points which are advected on a background grid. Problems are encountered with the original MPM when material points cross between grid cells, and this has been tackled by the development of the Generalised Interpolation MPM, where material points' domains of influence extend beyond the currently occupied grid cell. In this paper, the...

[1+1'] REMPI of NO clusters [dataset]

Jack Eardley
Unpublished work.

CPC code creation software as presented at Coherent Parity Check Construction for Quantum Error Correction [software]

Nicholas Chancellor
This folder contains code based on the methods of arXiv:1611.08012 by N. Chancellor, A. Kissenger, J. Roffe, S. Zohren, and D. Horsman feel free to reuse/modify but please attribute the source and cite our paper in any published work All code in this folder was written by Nicholas Chancellor We have created two versions of the code, one in GNU Octave, and one in Python 3, both sets of code provide the same functionality and...

Data for "Dressed-state electromagnetically induced transparency for light storage in uniform phase spin-waves"

Nikola Šibalić
We present, experimentally and theoretically, a scheme for dressed-state electromagnetically induced transparency (EIT) in a three-step cascade system where a four-level system is mapped into an effective three-level system. Theoretical analysis reveals that the scheme provides coherent state control via adiabatic following and provides a generalized protocol for light storage in uniform phase spin-waves that are insensitive to motional dephasing. The three-step driving enables a number of other features including spatial selectivity of the excitation...

Bioinspired Breathable Architecture Data Archive

Rowan M Von Spreckelsen & Matthew T Harris
Abstract from paper: Thuja plicata is a coniferous tree which displays remarkable water channelling properties. In this article, an easily fabricated mesh inspired by the hierarchical macro surface structure of Thuja plicata branchlets is described which emulates this efficient water collection behaviour. The key parameters are shown to be the pore size, pore angle, mesh rotation, tilt angle (branch droop) and layering (branch overlap). Envisaged societal applications include water harvesting and low cost breathable architecture...

Research data for "Nanoscale depth-resolved polymer dynamics probed by the implantation of low energy muons"

Tom Lancaster, Francis Pratt, Peter Baker, Stephen Blundell, Thomas Prokscha, Elvezio Morenzoni, Andreas Suter & Hazel Assender
The low energy muon (LEM) technique has been used to probe local changes in the dynamical spectrum of thin film polymer samples taking place as a function of the temperature and the implantation depth below the free surface. The studies have been made on samples of polydimethylsiloxane (PDMS) and polybutadiene (PB) using the transverse magnetic field (TF) configuration and diamagnetic probe muons. In PDMS evidence is found for suppression of the glass transition temperature near...

Supporting data for: Optimal design of a toroidal field magnet system and cost of electricity implications for a tokamak using high temperature superconductors

T. S. Lee, I. Jenkins, Elizabeth Surrey & Damian Hampshire
The potential for reducing the Cost of Electricity (CoE) by using High Temperature Superconductors (HTS) in the Toroidal Field (TF) coils of a fusion tokamak power plant has been investigated using a new HTS module in the PROCESS systems code. We report the CoE and the design of HTS tokamaks that have been optimized by minimising the major radius of the plasma. Potential future improvements in both the superconducting properties and the structural materials for...

Improved Raindrop Detection using Combined Shape and Saliency Descriptors with Scene Context Isolation - Evaluation Dataset

Toby P. Breckon & Dereck D. Webster
The presence of raindrop induced image distortion has a significant negative impact on the performance of a wide range of all-weather visual sensing applications including within the increasingly import contexts of visual surveillance and vehicle autonomy. A key part of this problem is robust raindrop detection such that the potential for performance degradation in effected image regions can be identified. Here we address the problem of raindrop detection in colour video imagery using an extended...

Software and Dataset for "Phase Separation on Bicontinuous Cubic Membranes: Symmetry Breaking, Re-entrant and Domain Facetting"

Halim Kusumaatmaja, Fabien Paillusson & Matthew Pennington
We study the phase separation of binary lipid mixtures that form bicontinuous cubic phases. The competition between non-uniform Gaussian membrane curvature and line tension leads to a very rich phase diagram, where we observe symmetry breaking of the membrane morphologies and re- entrant phenomena due to the formation of bridges between segregated domains. Upon increasing the line tension contribution, we also find facetting of lipid domains that we explain using a simple argument based on...

On Lagrangian mechanics and the material point method for large deformation elasto-plasticity [dataset]

W.M. Coombs, C.E. Augarde, A.J. Brennan, M.J. Brown, T.J. Charlton, J.A. Knappett, Y. Ghaffari Motlagh & L. Wang
Figure dataset for "On Lagrangian mechanics and the material point method for large deformation elasto-plasticity"

Absolute fluorescence and absorption measurements over a dynamic range of 1E6 with cavity-enhanced laser-induced fluorescence [dataset]

Scott E. Sanders, Oliver R. Willis, N. Hendrik Nahler & Eckart Wrede
The meta data is listed in the file Metadata.pdf included in the ZIP file.

Supporting Data for Pharmaceutical Polymorph Control in a Drug-Mimetic Supramolecular Gel

Jonathan A. Foster, Krishna K. Damodaran, Antoine Maurin, Graeme M. Day, Hugh P. G. Thompson, Gary S. Cameron, Jenifer Cuestra & Jonathan W. Steed
We report the synthesis of a bis(urea) gelator designed to specifically mimic the chemical structure of the highly polymorphic drug substance ROY. Crystallization of ROY from toluene gels of this gelator results in the formation of the metastable red form instead of the thermodynamic yellow polymorph. In contrast, all other gels and solution control experimetns give the yellow form. Conformational and crystal structure prediction methods have been used to propose the structure of the gel...

The Development of Visually Guided Stepping [dataset]

Rachel Mowbray, Janna Gottwald, Manfei Zhao, Anthony Atkinson & Dorothy Cowie
Supporting data for "The Development of Visually Guided Stepping"

Computing small pivot-minors [software]

Konrad K. Dabrowski
A graph G contains a graph H as a pivot-minor if H can be obtained from G by applying a sequence of vertex deletions and edge pivots. Pivot-minors play an important role in the study of rank-width. However, so far, pivot-minors have only been studied from a structural perspective. In the associated paper, we initiate a systematic study into their complexity aspects. We first prove that the Pivot-Minor problem, which asks if a given graph...

Field imaging near to the surface of terahertz reflective optics using a vector network analyzer

Maryam Hajji
Dataset contains S-parameter measurements recorded with Vector Network Analyser Agilent N5224A. Data are stored as a Matlab v5 (*.mat) file. Complex values of the measured S-parameter are stored in a 101x101x11 (X*Y*Z) matrix.

Data for: "Real-Time Near-Field Terahertz Imaging with Atomic Optical Fluorescence"

Christopher G. Wade, Nikola Šibalić, Natalia R. De Melo, Jorge M. Kondo, Charles S. Adams & Kevin J. Weatherill
Terahertz (THz) near-field imaging is a flourishing discipline, with applications from fundamental studies of beam propagation to the characterisation of metameterials and waveguides. Beating the diffraction limit typically involves rastering structures or detectors with length scale shorter than the radiation wavelength; in the THz domain this has been achieved using a number of techniques including scattering tips and apertures. Alternatively, mapping THz fields onto an optical wavelength and imaging the visible light removes the requirement...

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