68,403 research outputs found
High Pressure Synthesis, Crystal Growth and Magnetic Properties of TiOF
No full textData to accompany publication;
High Pressure Synthesis, Crystal Growth and Magnetic Properties of TiOF
J. Cumby, M. B. Burchell and J. P. Attfield
Solid State Sciences (2018)
Single crystal data files for TiOF at 90 and 200 K. cif files and standard formats used by the SHELX package are provided
Laboratory Studies of Hypervelocity Impacts on Solar System Analogues
Full text linkImpact cratering and asteroid collisions are major processes throughout the Solar System. Although previous collision-related impact investigations exist (Flynn et al. 2015, Holsapple et al. 2002 and Burchell et al. 1998 are good examples), in the works covering this broad range of investigation, the targets are non-rotating (for the purposes of catastrophic disruption) and different temperature conditions are not considered (for impact cratering). Accordingly, I present experimental processes and data, regarding hypervelocity impact experiments into analogues of (1) rotating asteroids and (2) temperature dependant terrestrial planetary rock.
During the course of this work, it was necessary to develop new apparatus and new experimental techniques such as three separate target holders to aid in both catastrophic disruption and heated impact projects, a 3-dimensional model analysis of craters and a completely new, statistically robust, technique to determine a complete crater profile called the KDM method where KDM is Kinnear-Deller-Morris.
The main result from this work showed that during an asteroid impact collision where the asteroid is not rotating, the impact energy density for catastrophic disruption is Q*static = 1442 ± 90 J kg-1. However, when the target asteroid was rotating, the condition Q*rotation = 1097 ± 296 J kg-1. The mean value of Q* had thus reduced, but the spread in the data on individual experiments was larger. This leads to two conclusions. The mean value for Q*, based on measurements of many impacts, falls, due to the internal forces acting in the body which are associated with the rotation. This energy term reduction means that the amount of energy to instigate catastrophic disruption is lower and that a rotating asteroid is effectively weaker upon impact than a stationary asteroid. However, the spread in the results indicates that this is not a uniform process, and an individual result for Q* for a rotating or spinning target may be spread over a large range. For the temperature related impacts, as the targets were heated to approximately 1000 K, the target rocks showed an impact dependence more similar to a plastic phase-state than to solidus, due to being held close to temperatures associated with semi-plastic phases. Basalt impact craters displayed this relationship greatest with crater sizes becoming smaller at the higher temperature ranges but larger in the colder brittle solidus temperatures, partly explained in experiments by increased spallation
High Pressure Synthesis, Crystal Growth and Magnetic Properties of TiOF
No full textData to accompany publication; High Pressure Synthesis, Crystal Growth and Magnetic Properties of TiOF J. Cumby, M. B. Burchell and J. P. Attfield Solid State Sciences (2018) Single crystal data files for TiOF at 90 and 200 K. cif files and standard formats used by the SHELX package are provided.Attfield, J Paul; Cumby, J; Burchell, MB. (2018). High Pressure Synthesis, Crystal Growth and Magnetic Properties of TiOF, [dataset]. University of Edinburgh. School of Chemistry. http://dx.doi.org/10.7488/ds/2336
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
Full text linkFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Apoptosis of monocytes and the influence on yield of monocyte-derived dendritic cells
No full textBohnenkamp H, Burchell J, Taylor-Papadimitriou J, Noll T. Apoptosis of monocytes and the influence on yield of monocyte-derived dendritic cells. Journal of Immunological Methods. 2005;294(1-2):67-80
Flexicurity as a moderator of the relationship between job insecurity and psychological well-being
Full text linkFlexicurity has been heralded as the solution to simultaneously maintain the well-being of employees through employment security while allowing employers to benefit from flexibility. This paper examines one of the claimed benefits that countries with flexicurity policies will reduce the stress on employees who experience job insecurity. More specifically, it is argued that more generous unemployment benefits along with active labour market policies to facilitate rapid re-employment reduces the anxiety associated with insecurity. Analyses of two international data sets found little evidence for this moderation of the link between insecurity and well-being in countries that are assumed to be exemplars of flexicurity. The economic rationality behind these claims is questioned, and a psychological approach to job insecurity is suggested as an alternative
Letter from Carl Hayden to M. J. Riordan
No full textLetter from Carl Hayden to M. J. Riordan expressing his support for Coconino County in turning over the Bright Angel Trail to the federal government
Breast carcinoma cell lysate-pulsed dendritic cells cross-prime MUC1 specific cytotoxic T-cells identified by peptide-MHC-class-I tetramers
No full textBohnenkamp H, Coleman J, Burchell J, Taylor-Papadimitriou J, Noll T. Breast carcinoma cell lysate-pulsed dendritic cells cross-prime MUC1 specific cytotoxic T-cells identified by peptide-MHC-class-I tetramers. Cellular Immunology. 2004;231(1-2):112-125
Letter from M. J. Riordan, Arizona Lumber and Timber Company, to Carl Hayden
No full textLetter from M. J. Riordan to Carl Hayden expressing his opposition to the federal government's takeover of Bright Angel Trail
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