443 research outputs found
Two qubits in one transmon -- QEC without ancilla hardware
We show that it is theoretically possible to use higher energy levels for
storing and controlling two qubits within a superconducting transmon. This is
done by identifying energy levels as product states between multiple effecitve
qubits. As a proof of concept we realise a complete set of gates necessary for
universal computing by numerically optimising control pulses for single qubit
gates on each of the qubits, entangling gates between the two qubits in one
transmon, and an entangling gate between two qubits from two coupled transmons.
The optimisation considers parameters which could make it possible to validate
this experimentally. With these control pulses it is in principle possible to
double the number of available qubits without any overhead in hardware. The
additional qubits could be used in algorithms which need many short-living
qubits such as syndrom qubits in error correction or by embedding effecitve
higher connectivity in qubit networks.Comment: 14 pages, 12 figure
Relationships between lamb carcass quality traits measured by X-ray computed tomography (CT) and current UK-hill sheep breeding goals.
Stakeholders understanding of the concept of benefit sharing in health research in Kenya: a qualitative study
BACKGROUND: The concept of benefit sharing to enhance the social value of global health research in resource poor settings is now a key strategy for addressing moral issues of relevance to individuals, communities and host countries in resource poor settings when they participate in international collaborative health research.The influence of benefit sharing framework on the conduct of collaborative health research is for instance evidenced by the number of publications and research ethics guidelines that require prior engagement between stakeholders to determine the social value of research to the host communities. While such efforts as the production of international guidance on how to promote the social value of research through such strategies as benefit sharing have been made, the extent to which these ideas and guidelines have been absorbed by those engaged in global health research especially in resource poor settings remains unclear. We examine this awareness among stakeholders involved in health related research in Kenya. METHODS: We conducted in-depth interviews with key informants drawn from within the broader health research system in Kenya including researchers from the mainstream health research institutions, networks and universities, teaching hospitals, policy makers, institutional review boards, civil society organisations and community representative groups. RESULTS: Our study suggests that although people have a sense of justice and the moral aspects of research, this was not articulated in terms used in the literature and the guidelines on the ethics of global health research. CONCLUSION: This study demonstrates that while in theory several efforts can be made to address the moral issues of concern to research participants and their communities in resource poor settings, quick fixes such as benefit sharing are not going to be straightforward. We suggest a need to pay closer attention to the processes through which ethical principles are enacted in practice and distil lessons on how best to involve individuals and communities in promoting ethical conduct of global health research in resource poor settings
Use of agent-based modelling to validate hurricane evacuation planning
Justification for evacuation and evacuation planning is sometimes questioned and there is a need develop approaches which justify the planning and associated expenditure. To this end, it was decided to carry out a pilot evaluation of the impact of a Hurricane Storm surge flooding on Brunswick, GA using a dynamic Agent Based Model that represents people's interaction with a flood and provides estimates of the number of people that are likely to be killed as a result of a flood event, as well as the time that is required for them to evacuate the area at risk. Climate change increase of 3ft in mean sea level would increase the population at risk in Brunswick by 20% for a category 4 hurricane. The modelling shows that for a category 4 hurricane managed evacuation can significantly reduce the number of fatalities
Insights into microstructural interfaces in aerospace alloys characterised by atom probe tomography
SPIDERS: Selection of spectroscopic targets using AGN candidates detected in all-sky X-ray surveys
SPIDERS (SPectroscopic IDentification of eROSITA Sources) is an SDSS-IV
survey running in parallel to the eBOSS cosmology project. SPIDERS will obtain
optical spectroscopy for large numbers of X-ray-selected AGN and galaxy cluster
members detected in wide area eROSITA, XMM-Newton and ROSAT surveys. We
describe the methods used to choose spectroscopic targets for two
sub-programmes of SPIDERS: X-ray selected AGN candidates detected in the ROSAT
All Sky and the XMM-Newton Slew surveys. We have exploited a Bayesian
cross-matching algorithm, guided by priors based on mid-IR colour-magnitude
information from the WISE survey, to select the most probable optical
counterpart to each X-ray detection. We empirically demonstrate the high
fidelity of our counterpart selection method using a reference sample of bright
well-localised X-ray sources collated from XMM-Newton, Chandra and Swift-XRT
serendipitous catalogues, and also by examining blank-sky locations. We
describe the down-selection steps which resulted in the final set of
SPIDERS-AGN targets put forward for spectroscopy within the eBOSS/TDSS/SPIDERS
survey, and present catalogues of these targets. We also present catalogues of
~12000 ROSAT and ~1500 XMM-Newton Slew survey sources which have existing
optical spectroscopy from SDSS-DR12, including the results of our visual
inspections. On completion of the SPIDERS program, we expect to have collected
homogeneous spectroscopic redshift information over a footprint of ~7500
deg for >85 percent of the ROSAT and XMM-Newton Slew survey sources having
optical counterparts in the magnitude range 17<r<22.5, producing a large and
highly complete sample of bright X-ray-selected AGN suitable for statistical
studies of AGN evolution and clustering.Comment: MNRAS, accepte
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The Ï„-plot, a multicomponent 1-D pole figure plot, to quantify the heterogeneity of plastic deformation
An approach is presented that allows multi-scale characterisations of heterogeneous deformation in crystalline materials by employing a range of characterisation techniques including: electron backscatter diffraction, digital image correlation and neutron diffraction powder measurements. The approach will be used to obtain critical information about the variations in parameters that characterise the deformed state in different crystallographic orientation texture components of a sample in a statistically significant way. These parameters include lattice strains, texture evolution, peak broadening, dislocation density, planar faults, phase changes and surface strain. This approach allows verification of models of plastic deformation to provide a more detailed view of plastic deformation heterogeneity at multiple length scales than obtained by other characterisation approaches. The approach demonstrated here is applied to two stainless steel alloys; an alloy that exhibits phase transformation during deformation and an alloy that remains the same phase all through deformation process
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