2,930 research outputs found
Design and development of a high-stiffness, high-resolution torque sensor
A sensor has been designed and tested for precise pointing applications. The device is able to sense extremely small rotary motion and is immune to cross-axis forces. The hardware and design characteristics of the torque sensor are presented. Test data, integrated control methodology, and future applications are included
On the application of extreme-value statistics to command oriented problems
Extreme value theory for estimating statistical parameters of spacecraft communication system
Correction of environmental magnetic fields for the acquisition of Nuclear magnetic relaxation dispersion profiles below Earthās field
V.Z. acknowledges funding from EPSRC under grant number EP/J500045/1, āA UK Magnetic Resonance Basic Technology Centre for Doctoral Trainingā. Aspects of the work were funded by EPSRC grant EP/K020293/1, āZero-Field MRI to Enhance Diagnosis of Neurodegenerationā. This project has also received funding from the European Unionās Horizon 2020 research and innovation program under grant agreement No 668119, project āIDentIFYā. The authors are grateful to Mr. G.P. Ashcroft and Dr. W. Mathieson for providing access to the biological samples used.Peer reviewedPublisher PD
Rapid field-cycling MRI using fast spin-echo
Copyright Ā© 2014 Wiley Periodicals, Inc.Peer reviewedPostprin
Design and construction of an actively frequency-switchable RF coil for field-dependent Magnetisation Transfer Contrast MRI with fast field-cycling
Copyright Ā© 2010 Elsevier Inc. All rights reserved.Peer reviewedPostprin
Deuteron-equivalent and phase-equivalent interactions within light nuclei
Background: Phase-equivalent transformations (PETs) are well-known in quantum
scattering and inverse scattering theory. PETs do not affect scattering phase
shifts and bound state energies of two-body system but are conventionally
supposed to modify two-body bound state observables such as the rms radius and
electromagnetic moments. Purpose: In order to preserve all bound state
observables, we propose a new particular case of PETs, a deuteron-equivalent
transformation (DET-PET), which leaves unchanged not only scattering phase
shifts and bound state (deuteron) binding energy but also the bound state wave
function. Methods: The construction of DET-PET is discussed; equations defining
the simplest DET-PETs are derived. We apply these simplest DET-PETs to the
JISP16 interaction and use the transformed interactions in
calculations of H and He binding energies in the No-core Full
Configuration (NCFC) approach based on extrapolations of the No-core Shell
Model (NCSM) basis space results to the infinite basis space. Results: We
demonstrate the DET-PET modification of the scattering wave functions and
study the DET-PET manifestation in the binding energies of H and He
nuclei and their correlation (Tjon line). Conclusions: It is shown that some
DET-PETs generate modifications of the central component while the others
modify the tensor component of the interaction. DET-PETs are able to
modify significantly the scattering wave functions and hence the off-shell
properties of the interaction. DET-PETs give rise to significant changes
in the binding energies of H (in the range of approximately 1.5 MeV) and
He (in the range of more than 9 MeV) and are able to modify the correlation
patterns of binding energies of these nuclei
Simple algorithm for the correction of MRI image artefacts due to random phase fluctuations
Grant support: This work was supported by EPSRC [grant numbers EP/E036775/1, EP/K020293/1] and received funding from the European Union's Horizon 2020 research and innovation programme [grant agreement No 668119, project āIDentIFYā]Peer reviewedPublisher PD
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