243 Works

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...

Computer-aided patterning design for self-assembled microsphere lithography

Rhiannon Lees
In this paper, we use a finite difference time domain solver to simulate the near field optical properties of self-assembled microsphere arrays when exposed to an incoherent light source. Such arrays are typically used for microsphere lithography where each sphere acts as a ball lens, focusing ultraviolet light into an underlying photoresist layer. It is well known that arrays of circular features can be patterned using this technique. However, here, our simulations show that additional...

Durham RCUK Open Access Data Year 2 (Aug2014-Jul2015)

James Bisset
Data on compliance of Durham publications with RCUK Open Access policy, including APC spend from the RCUK block grant. Year 2: August 1st 2014 to July 31st 2015

A parabolic level set reinitialisation method using a discontinuous Galerkin discretisation [figure data]

Thomas Adams, Nicholas McLeish, Stefano Giani & William M Coombs
Level set reinitialisation is a part of the level set methodology which allows one to generate, at any point during level set evolution, a level set function which is a signed distance function to its own zero isocontour. Whilst not in general a required condition, maintaining the level set function as a signed distance function is often desirable as it removes a known source of numerical instability. This paper presents a novel level set reinitialisation...

Harnessing energy landscape exploration to control the buckling of cylindrical shells [dataset]

Jack Panter, Halim Kusumaatmaja, Teng Zhang & Junbo Chen
Even for relatively simple thin shell morphologies, many different buckled configurations can be stable simultaneously. Which state is observed in practice is highly sensitive to both environmental perturbations and shell imperfections. The complexity and unpredictability of postbuckling responses has therefore raised great challenges to emerging technologies exploiting buckling transitions. Here we show how the buckling landscapes can be explored through a comprehensive survey of the stable states and the transition mechanisms between them, which we...

Pretrained Neural Network Models for Samarth 2019 study - TensorFlow format

Ganesh Samarth
In this work we explore different Convolutional Neural Network (CNN) architectures and their variants for non-temporal binary fire detection and localization in video or still imagery. We consider the performance of experimentally defined, reduced complexity deep CNN architectures for this task and evaluate the effects of different optimization and normalization techniques applied to different CNN architectures (spanning the Inception, ResNet and EfficientNet architectural concepts). Contrary to contemporary trends in the field, our work illustrates a...

Could sex robots threaten livelihoods [dataset]

Anna Hallam
This study analyses the attitudes of sex workers towards sex dolls and sex robots, and explores how an increase in sex robots on the market may impact the lives and business of sex workers. It focuses primarily on whether or not the displacement of sex workers by sex robots should be a concern. An online 12-question survey was distributed to sex workers through the mailing lists of sex-worker-led unions and activist groups. The questionnaire received...

Rain Drop Image Data Set for Guo 2018 study - still image set

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...

Data for the paper: GMP polyamine hybrid hydrogels-enhanced gel strength probed by z-spectroscopy

Juan A. Aguilar Malavia, Raquel Belda Vidal, Jonathan W. Steed, Gareth A. Morris & Enrique Garcia-España
The self-assembling tendencies of guanosine-5’-monophosphate (GMP) can be drastically increased using polyamines, with potential applications in the production of biocompatible smart materials, as well as for the design of anti-tumoral drugs based on G-quadruplex tabilization. Results from scanning electron microscopy (SEM), wide angle X-ray scattering (WAXS), rheology and nuclear magnetic resonance (NMR) z-spectroscopy studies are presented.

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....

Data management plans (DMPs and maDMPs) [other]

Nicholas Syrotiuk
Slides available on Prezi.com until we pay to download them in a proprietary file format: https://prezi.com/p/udmgch_km-mb

Supporting information for "Optimising minimal building blocks for addressable assembly"

Jim Madge & Mark A. Miller

Atomic Faraday filter with equivalent noise bandwidth less than 1 GHz: Data

M. A. Zentile, J. Keaveney, D. J. Whiting, C. S. Adams & I. G. Hughes
Filter spectra and optimisation results

Observation of interference effects via four photon excitation of highly excited Rydberg states in thermal cesium vapor (Data files)

Jorge M. Kondo, Nikola Šibalić, Alex Guttridge, Christopher G. Wade, Natalia R. De Melo, Charles S. Adams & Kevin J. Weatherill
We report on the observation of Electromagnetically Induced Transparency (EIT) and Absorption (EIA) of highly-excited Rydberg states in thermal Cs vapor using a 4-step excitation scheme. The advantage of this 4-step scheme is that the final transition to the Rydberg state has a large dipole moment and one can achieve similar Rabi frequencies to 2 or 3 step excitation schemes using two orders of magnitude less laser power. Consequently each step is driven by a...

Imposition of essential boundary conditions in the material point method (figure data)

Michael Cortis, Charles Augarde, William Coombs, Scott Robinson, Andrews Brennan & Michael Brown
There is increasing interest in the Material Point Method (MPM) as a means of modelling solid mechanics problems in which very large deformations occur, e.g. in the study of landslides and metal forming, however some aspects vital to wider use of the method have to date been ignored, in particular methods for imposing essential boundary conditions in the case where the problem domain boundary does not coincide with the background grid element edges. In this...

Joshua P Rogers PhD Thesis - Photoelectron spectroscopy of (C6F6)n- and (C6F6)I- clusters in a novel instrument

Joshua P. Rogers
The digital appendix for this thesis can be found at http://etheses.dur.ac.uk/12364

Domain wall encoding of integer variables for quantum annealing and QAOA [dataset]

Nicholas Chancellor
All of the data from the paper, as well as an easy python module or creating domain wall encodings. Marked as software, even though it also does contain the datasets.

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...

Magnetic order and enhanced exchange in the quasi-one-dimensional molecule-based antiferromagnet Cu(NO3)2(pyz)3 [dataset]

Tom Lancaster, Benjamin M Huddart, Jamie Brambleby, Paul A Goddard, Fan Xiao, Stephen J Blundell, Francis L Pratt, John Singleton, Piero Macchi, Rebecca Scatena, Alyssa M Barton & Jamie L Manson
The quasi-one-dimensional molecule-based Heisenberg antiferromagnet Cu(NO3)2(pyz)3 has an intrachain coupling J = 13.7(1) K and exhibits a state of long-range magnetic order below TN = 0.105(1) K. The ratio of interchain to intrachain coupling is estimated to be |J′/J| = 3.3 × 10−3, demonstrating a high degree of isolation for the Cu chains.

Direct measurement of excited-state dipole matrix elements using electromagnetically induced transparency in the hyperfine Paschen-Back regime

Daniel J Whiting, James Keaveney, Charles S Adams & Ifan G Hughes
The folder "transmission-spectra" contains the raw data files (in CSV format) for the transmission signal of the probe beam along with files named etalon and reference which were used in the frequency calibration of the transmission spectra. The folder "beam-profiles" contains the raw images of the probe and control beams in BMP format.

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...

Raw data for the paper: "Compressed NMR: Combining Compressive Sampling and Pure Shift NMR Techniques"

Juan A. Aguilar & Alan M. Kenwright
The spectra can be opened using VNMRJ, MestreNova and TopSpin.

Coulomb anti-blockade in a Rydberg dressed gas [dataset]

Alistair Bounds & Matther Jones
We perform a comprehensive investigation of the coupling between a Rydberg-dressed atomic gas and an ultra-cold plasma. Using simultaneous timeresolved measurements of both neutral atoms and ions, we show that plasma formation occurs via a Coulomb anti-blockade mechanism, in which background ions DC Stark shift nearby atoms into resonance at specific distances. The result is a highly correlated growth of the Rydberg population that shares some similarities with that previously observed for van der Waals...

The Impact of Diffuser Augmentation on a Tidal Stream Turbine

Nicholas Cresswell, Grant Ingram & Robert Dominy
Full data underlying the figures and referenced statistics in the paper "The Impact of Diffuser Augmentation on a Tidal Stream Turbine" published in Ocean Engineering

Data for "Enhanced optical cross section via collective coupling of atomic dipoles in a 2D array"

Robert J. Bettles
Enhancing the optical cross section is an enticing goal in light-matter interactions, due to its fundamental role in quantum and non-linear optics. Here, we show how dipolar interactions can suppress off-axis scattering in a two-dimensional atomic array, leading to a subradiant collective mode where the optical cross section is enhanced by almost an order of magnitude. As a consequence, it is possible to attain an optical depth which implies high fidelity extinction, from a monolayer....

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