35 Works

Two-photon photoassociation spectroscopy of CsYb: ground-state interaction potential and interspecies scattering lengths [dataset]

Alexander Guttridge
Data files used in the publication "Two-photon photoassociation spectroscopy of CsYb: ground-state interaction potential and interspecies scattering lengths"

A terahertz-driven non-equilibrium phase transition in a room temperature atomic vapour [dataset]

Kevin Weatherill
There are few demonstrated examples of phase transitions that may be driven directly by terahertz-frequency electric fields, and those that are known require field strengths exceeding 1MVcm−1. Here we report a non-equilibrium phase transition driven by a weak (≪ 1Vcm−1), continuous-wave terahertz electric field. The system consists of room-temperature caesium vapour under continuous optical excitation to a high-lying Rydberg state, which is resonantly coupled to a nearby level by the terahertz electric field. We use...

Extending Deep Neural Network Trail Navigation for Unmanned Aerial Vehicle Operation within the Forest Canopy - Evaluation [dataset]

Bruna G. Maciel-Pearson & Toby P. Breckon
Autonomous flight within a forest canopy represents a key challenge for generalised scene understanding on-board a future Unmanned Aerial Vehicle (UAV) platforms. Here we present an approach for automatic trail navigation within such an unstructured environment that successfully generalises across differing image resolutions - allowing UAV with a varying sensor payload capabilities to operate equally in such challenging environmental conditions. Specifically, this work presents an optimised deep neural network architecture, capable of state-of-the-art performance across...

Topological properties of a dense atomic lattice gas [dataset]

Robert J. Bettles, Jiri Minar, Charles S. Adams, Igor Lesanovsky & Beatriz Olmos
We investigate the existence of topological phases in a dense two-dimensional atomic lattice gas. The coupling of the atoms to the radiation field gives rise to dissipation and a nontrivial coherent long-range exchange interaction whose form goes beyond a simple power law. The far-field terms of the potential—which are particularly relevant for atomic separations comparable to the atomic transition wavelength—can give rise to energy spectra with one-sided divergences in the Brillouin zone. The long-ranged character...

Electrical and mechanical diagnostic indicators of wind turbine induction generator rotor faults [dataset]

Donatella Zappalá
In MW-sized wind turbines, the most widely-used generator is the wound rotor induction machine, with a partially-rated voltage source converter connected to the rotor. This generator is a significant cause of wind turbine fault modes. In this paper, a harmonic time-stepped generator model is applied to derive wound rotor induction generator electrical & mechanical signals for fault measurement, and propose simple closed-form analytical expressions to describe them. Predictions are then validated with tests on a...

Segments of straws [dataset]

Zhenning Liu
Each row of the file represents one segment. The first two columns are x-coordinates and y-coordinates of beginning points of each segment and the third, fourth columns are coordinates of endpoints. The fifth and sixth columns are m and b values of the straight line function y=mx+b of segments.

A high-order elliptic PDE based level set reinitialisation method using a discontinuous Galerkin discretisation [figure data]

Thomas Adams, Stefano Giani & William M Coombs
Abstract from paper: In this paper, an efficient, high-order accurate, level set reinitialisation method is proposed, based on the elliptic reinitialisation method (Basting and Kuzmin, 2013), which is discretised spatially using the discontinuous Galerkin (DG) symmetric interior penalty method (SIPG). In order to achieve this a number of improvements have been made to the elliptic reinitialisation method including; reformulation of the underlying minimisation problem driving the solution; adoption of a Lagrange multiplier approach for enforcing...

Torso rotation and hand position modulation functional MRI [dataset]

Jason Connolly
Please download this dataset from DU Box as follows: https://durhamuniversity.box.com/s/woibn9xp2q00vbn6p20h2f1eeckv72j3 Note: Login is *not* required.

Durham RCUK Open Access Data Year 5 (Apr2017-Mar2018)

James Bisset & Sarah Hyland
Data on compliance of Durham publications with RCUK Open Access policy, including APC spend from the RCUK block grant. Year 5: April 1st 2017 to March 31st 2018

ElecSus: extension to arbitrary geometry magneto-optics [dataset and software]

James Keaveney, Charles Adams & Ifan Hughes
An alternative to the GitHub repositories for the ElecSus codes and test data, also available at https://github.com/jameskeaveney/ElecSus and https://github.com/jameskeaveney/ElecSusTestData

Rydberg-Dressed Magneto-Optical Trap [dataset]

N. C. Jackson, A.D. Bounds, R.K. Hanley, R. Faoro, E.M. Bridge, P. Huillery & M. P. A. Jones
Data supporting the publication "Rydberg-Dressed Magneto-Optical Trap". Contains data for each of the Figures 1-5 shown in the main text.

Pretrained Neural Network Models for Guo 2018 study - TensorFlow format

Tiancheng Guo
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 important 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 by considering three...

Magnetic phases of skyrmion-hosting GaV4S8−ySey ( y = 0, 2, 4, 8) probed with muon spectroscopy [dataset]

Tom Lancaster, Kévin Franke, Benjamin Huddart, Thomas Hicken, Fan Xiao, Stephen Blundell, Francis Pratt, Joel Barker, Stewart Clark, Ales Stefancic, Monica Ciomaga Hatnean & Geetha Balakrishnan
We present the results of a muon-spin spectroscopy investigation of GaV4S8−ySey with y=0,2,4, and 8. Zero-field measurements suggest that GaV4Se8 and GaV4S8 have distinct magnetic ground states, with the latter material showing an anomalous temperature dependence of the local magnetic field. It is not possible to evolve the magnetic state continuously between these two systems, with the intermediate y=2 and 4 materials showing glassy magnetic behavior at low temperature. The skyrmion lattice (SkL) phase is...

Mechanical properties of biopolymer-stabilised soil-based construction materials [dataset]

Sravan Muguda Viswanath, Samuel Booth, Paul Hughes, Charles Augarde, Celine Perlot, Agostino Walter Bruno & Domenico Gallipoli

Efficient current-induced magnetization reversal by spin-orbit torque in Pt/Co/Pt [dataset]

A.T. Hindmarch
Current-induced magnetization reversal due to spin-orbit torque is demonstrated in an anisotropy controlled Pt/Co/Pt trilayer. The samples were designed to have weak perpendicular magnetic anisotropy, with a measured anisotropy field of (1340±20) Oe. Reversal is shown to be dominated by a damping-like torque associated with the spin-Hall effect. A small in-plane magnetic field was required to break the symmetry and enable reversal. With a 273 Oe field, magnetization reversal occurred with a current density amplitude of...

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...

Non-intrusive torque measurement for rotating shafts using optical sensing of zebra-tapes [dataset]

Donatella Zappalá, Matteo Bezziccheri, Christopher James Crabtree & Nicola Paone
Non-intrusive, reliable and precise torque measurement is critical to dynamic performance monitoring, control and condition monitoring of rotating mechanical systems. This paper presents a novel, contactless torque measurement system consisting of two shaft-mounted zebra tapes and two optical sensors mounted on stationary rigid supports. Unlike conventional torque measurement methods, the proposed system does not require costly embedded sensors or shaft-mounted electronics. Moreover, its non-intrusive nature, adaptable design, simple installation and low cost make it suitable...

Ultracold Molecules for Quantum Simulation: Rotational Coherences in CaF and RbCs [dataset and software]

Jacob Blackmore & Luke Caldwell
Polar molecules offer a new platform for quantum simulation of systems with long-range interactions, based on the electrostatic interaction between their electric dipole moments. Here, we report the development of coherent quantum state control using microwave fields in 40Ca19F and 87Rb133Cs molecules, a crucial ingredient for many quantum simulation applications. We perform Ramsey interferometry measurements with fringe spacings of ~ 1 kHz and investigate the dephasing time of a superposition of N = 0 and...

Overcoming volumetric locking in material point methods (figure data)

William Coombs, Tim Charlton, Michael Cortis & Charles Augarde
Material point methods suffer from volumetric locking when modelling near incompressible materials due to the combination of a low-order computational mesh and large numbers of material points per element. Large numbers of material points per element are required to reduce integration errors due to non-optimum placement of integration points. This restricts the ability of current material point methods in modelling realistic material behaviour. This paper presents for the first time a method to overcome finite...

Photoassociation of ultracold CsYb molecules and determination of interspecies scattering lengths [dataset]

Alex Guttridge
This thesis reports the first measurements of the ground state binding energies of CsYb molecules and the scattering lengths of the Cs+Yb system. The knowledge gained from these measurements will be essential for devising the most efficient route for the creation of rovibrational ground state CsYb molecules. CsYb molecules in the rovibrational ground state possess both electric and magnetic dipole moments which opens up a wealth of applications in many areas of physics and chemistry....

Dynamic Morphologies and Stability of Droplet Interface Bilayers [dataset and software]

Benjamin Guiselin, Jack O Law, Buddhapriya Chakrabarti & Halim Kusumaatmaja
We develop a theoretical framework for understanding dynamic morphologies and stability of droplet interface bilayers (DIBs), accounting for lipid kinetics in the monolayers and bilayer, and droplet evaporation due to imbalance between osmotic and Laplace pressures. Our theory quantitatively describes distinct pathways observed in experiments when DIBs become unstable. We find that when the timescale for lipid desorption is slow compared to droplet evaporation, the lipid bilayer will grow and the droplets approach a hemispherical...

Durham RCUK [Green] Open Access Data Year 5 (Apr2017-Mar2018)

James Bisset & Sarah Hyland
Also includes a list of 45 outputs reported as non-complliant as at 31st May 2018.

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...

Registration Year

  • 2018

Resource Types

  • Dataset