16,039 Works

Crystal structure of Bi2W2O9

Dr Emma McCabe & Dr Dominic Fortes

Copy of: Understanding Radiation-induced Effects in State-of-the-Art Embedded Processors

Dr James Davis, Dr Maria Kastriotou & Mr Harvin Iriawan
The susceptibility of electronic devices to atmospheric radiation is no longer just of concern to the aerospace industry. At sea level, a 100,000-device deployment can expect to experience a radiation-induced failure once every few hours. System reliability is thus of ever-increasing concern, particularly in safety-critical scenarios including in the automotive and health sectors, wherein the use of performance-demanding machine learning applications is increasingly desired. We wish to increase our knowledge of radiation-induced effects in modern...

Copy of: Understanding Radiation-induced Effects in State-of-the-Art Embedded Processors

Dr James Davis, Dr Maria Kastriotou & Mr Harvin Iriawan
The susceptibility of electronic devices to atmospheric radiation is no longer just of concern to the aerospace industry. At sea level, a 100,000-device deployment can expect to experience a radiation-induced failure once every few hours. System reliability is thus of ever-increasing concern, particularly in safety-critical scenarios including in the automotive and health sectors, wherein the use of performance-demanding machine learning applications is increasingly desired. We wish to increase our knowledge of radiation-induced effects in modern...

Methane Emissions: Remote Mapping and Source Quantification using an Open-path Laser Dispersion Spectrometer

Damien Weidmann
Open path measurements of atmospheric methane obtained during a demonstration campaign of a novel laser spectrometer for locating and quantifying methane leaks. Data were collected from the 8th of May 2017 to the 12th of May 2017. Data were collected at the STFC Chilbolton Observatory, Drove Road, Stockbridge, Hampshire, SO20 6BJ, UK.

Measuring magnetic excitations in K(NbO)Cu4(PO4)4

Professor Henrik Ronnow, Dr Peter Babkevich, Dr David Voneshen & Mr Luc Testa
I am working on a low dimensional quantum magnet family. A member of it, KNb, is a good experimental realisation of the squarelattice. It appears that this compound has a different magnetic structure than all the other members of this family. Our aim is tounderstand what are the effects on the magnetic excitations and to relate it to the high-symmetry features of this material.In order to be rigourous, we also would like to measure the...

Measuring magnetic excitations in K(NbO)Cu4(PO4)4

Professor Henrik Ronnow, Dr Peter Babkevich, Dr David Voneshen & Mr Luc Testa
I am working on a low dimensional quantum magnet family. A member of it, KNb, is a good experimental realisation of the squarelattice. It appears that this compound has a different magnetic structure than all the other members of this family. Our aim is tounderstand what are the effects on the magnetic excitations and to relate it to the high-symmetry features of this material.In order to be rigourous, we also would like to measure the...

Exploration for Spin Liquid State in Spinel Titanates

Professor Noriaki Hanasaki & Dr Isao Watanabe
We explore for the spin liquid state. Recently, the theoretical studies suggest that not only the frustrated lattice but also a structural fluctuation and disorder are important for the spin liquid state. The spinel titanate MgTi2O4 undergoes the structural transition from the cubic to tetragonal phase. The Ti ions are dimerized and form the spin singlet pairs. In the Mg-substituted Mg1+xTi2-xO4, though the tetragonal phase collapses, the Ti structural fluctuation remains and can induce the...

Hydrates in the binary system water–dimethylsulfoxide

Dr Victoria Garcia Sakai, Dr Oleg Kirichek & Dr Dominic Fortes
Mixture of water and dimethylsulfoxide (DMSO) are useful as preservative liquids for the storage of living cells at very low temperatures, such that they can be revived and used in therapeutic procedures. For example, liver cells generated from a patient's own stem-cells can be stored, recovered and grown for later re-implantation using a cryopreservation protocol developed at UCL and evaluated in recent beam-time on IRIS. However, mixtures of water and DMSO are able to crystallise...

Selective Laser Melting Induced Residual Stress in a Nickel-based Superalloy

Dr SHI SHI, Mr Chuan Guo, Dr QIANG ZHU, Dr Joe Kelleher, Mr Zhuozhi Fan & Dr Shuwen Wen
Nickel-based superalloy is widely used in aerospace engine components for its excellent high-temperature performance. Because of the difficulty in producing superalloy components with complicated geometries, selective laser melting (SLM) technology has been used. Although SLM has the talent in producing complex and net-shape geometries, thermal induced residual stress can result in micro-cracking, deteriorate mechanical properties and damage structural integrity. This stress could be controlled by SLM parameters. We propose accurate measurement of residual stress with...

Selective Laser Melting Induced Residual Stress in a Nickel-based Superalloy

Dr SHI SHI, Mr Chuan Guo, Dr QIANG ZHU, Dr Joe Kelleher, Mr Zhuozhi Fan & Dr Shuwen Wen
Nickel-based superalloy is widely used in aerospace engine components for its excellent high-temperature performance. Because of the difficulty in producing superalloy components with complicated geometries, selective laser melting (SLM) technology has been used. Although SLM has the talent in producing complex and net-shape geometries, thermal induced residual stress can result in micro-cracking, deteriorate mechanical properties and damage structural integrity. This stress could be controlled by SLM parameters. We propose accurate measurement of residual stress with...

Can identical crystals melt into two distinct liquids?

Dr Oliver Alderman, Dr Chris Benmore & Ms Angela Edwards
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...

Can identical crystals melt into two distinct liquids?

Dr Oliver Alderman, Dr Chris Benmore & Ms Angela Edwards
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...

Diffuse scattering investigation of out-of-equilibrium states in spin ice

Dr Sean Giblin, Dr Pascal Manuel, Dr Tom Fennell, Mr Lewis Edwards & Mr Edward Riordan
The spin ice material Dy2Ti2O7 is a frustrated material where the magnetic spins on a tetrahedra can only point into or out of the 111 crystallographic axis. Moreover, long range dipolar interactions competing with the local exchange means that 2 spins point into and 2 out of the 111 axis, and this state is degenerate, meaning there is a manifold of lowest energy states. Excitations out of this ground state make a 3 in, 1...

Diffuse scattering investigation of out-of-equilibrium states in spin ice

Dr Sean Giblin, Dr Pascal Manuel, Dr Tom Fennell, Mr Lewis Edwards & Mr Edward Riordan
The spin ice material Dy2Ti2O7 is a frustrated material where the magnetic spins on a tetrahedra can only point into or out of the 111 crystallographic axis. Moreover, long range dipolar interactions competing with the local exchange means that 2 spins point into and 2 out of the 111 axis, and this state is degenerate, meaning there is a manifold of lowest energy states. Excitations out of this ground state make a 3 in, 1...

Low-temperature structural phase transitions in CuSeO4·5D2O and CuBeF4·5D2O

Dr Alexandra Gibbs, Dr Silvia Capelli & Dr Dominic Fortes
The isostructural family of compounds that includes the familiar copper sulfate pentahydrate and the two less familiar title materials, has for decades been a model for studying a range of structural and magnetic phenomena. Our understanding of the magnetic transitions on cooling below 1 K have hitherto been based on an assumption that there is no preceding structural change, an assumption we now know to be false. We have shown that CuSO4.5D2O undergoes a loss...

Structure-property relationships in new oxide ion conductor Ba3NbWO8.5

Professor Ivana Evans, Dr Josie Auckett & Dr Matthias Gutmann
Oxide ion conductors have been a focus of intense research due to their application as electrolytes in solid oxide fuel cells. The currently used materials (yttria-stabilised zirconia) require 800-1000°C to operate efficiently. New oxide materials are sought as electrolytes with high conductivity between 450 and 600°C. Ba3NbWO8.5 has high oxide ion conductivity in this range. It was first described as a new hybrid of the 9R perovskite and the palmierite structure. We have grown high-quality...

H/D isotope effect on enamtiomers: the case of Alanine

Dr Matthias Gutmann, Dr Dominic Fortes & Dr Silvia Capelli
In the current description of any molecular system based on the Schrodinger equation with a Hamiltonian accounting only for the electromagnetic forces, the structural properties of enantiomers should be perfectly mirror symmetric. A recent study on D-Alanine claims to have revealed dissimilarities in the structural properties of D-alanine compared with L-alanine. The fact that such a study was conducted only on the deuterated specie of one enantiomer without takinginto account the possibility of D/H exchange,...

Accounting for textural effects on total scattering data and the pair-distribution function

Dr Lewis Owen, Dr Howard Stone, Dr Helen Playford & Dr Nick Jones
The total scattering technique has become an invaluable method for probing the local structure of materials in a host of interesting fields. However, the technique is reliant on some assumptions about the nature of the material being studied that currently limits the application of the technique in certain fields. Of particularly significance is the orientation of grains within the sample, known as texture, which can be strongly dependent on the method of manufacture of the...

Understanding precrystallisation of MgSO4 through total neutron scattering.

Dr Mark Light, Dr Tom Headen, Miss Matilda Rhodes & Mr Daniel Irving
MgSO4 (and its numerous hydrates) is an important system industrially and has become a model system for fundamental crystallisation studies [4]. By studying an aqueous solution, we aim to investigate the suitability of neutron total scattering as a technique for probing the prenucleation structures and behaviour with the future aim of applying this knowledge to explain the crystallisation complexity of this system. Using the EPSR approach we would hope to model/fit the intermolecular interactions of...

Understanding precrystallisation of MgSO4 through total neutron scattering.

Dr Mark Light, Dr Tom Headen, Miss Matilda Rhodes & Mr Daniel Irving
MgSO4 (and its numerous hydrates) is an important system industrially and has become a model system for fundamental crystallisation studies [4]. By studying an aqueous solution, we aim to investigate the suitability of neutron total scattering as a technique for probing the prenucleation structures and behaviour with the future aim of applying this knowledge to explain the crystallisation complexity of this system. Using the EPSR approach we would hope to model/fit the intermolecular interactions of...

Local structure of liquid gallium-iodine and gallium-indium

Professor Christoph Salzmann, Dr Alfred Amon, Miss Bea Chikani, Dr Alexander Rosu-Finsen, Miss Rachael Smith & Dr Alex Hannon
Liquid metal alloys, with liquidus temperatures close to room temperature, are a rapidly developing research area with novel applications in renewable energy, catalysis, electronics and fluidics.Gallium-based alloys are widely employed due to their wide stability range and chemical inertness. However, their local structure and its connection to macroscopic properties are still scarcely investigated.Both gallium and iodine form dimeres in solid form, which possibly persist in the liquid. This peculiar behaviour and the influence of temperature...

Chipir commercial access: Cisco Systems Inc

Ms RITA FUNG & Dr Carlo Cazzaniga
Chipir commercial access: Cisco Systems Inc

1720468

Dr Silvia Capelli & Dr Dominic Fortes

1810508

Dr Sihai Yang, Professor Martin Schroder, Professor Sandy Blake & Dr Pascal Manuel

Neutron-induced Single Event Upsets in SRAMs for Terrestrial Enviroment

Dr Avner Haran, Professor Roberto Senesi, Professor Carla Andreani, Dr Carlo Cazzaniga, Dr Chris Frost & Mr Nir Yitzhak
As the technology node of CMOS electronic devices scales down, they become more and more susceptible to bit upsets caused by single particles impinging on the device, neutrons being part of them. We plan to measure the sensitivity of various synchronous random access memories (SRAM) to neutron generated bit upsets. In particular, we intend to test SRAM based FPGAs. This will provide us an excellent opportunity to compare experimental results to our theoretical models of...

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