31 research outputs found
Conclusion
This chapter summarizes the arguments and discusses the results of the GAP project in the context of the ongoing reform in fisheries governance
Intrinsic magnetism in superconducting infinite-layer nickelates
The discovery of superconductivity in NdSrNiO [1]
introduced a new family of layered nickelate superconductors that has now been
extended to include a range of Sr-doping [2, 3], Pr or La in place of Nd [4-6],
and the 5-layer NdNiO [7]. A number of studies indicate that
electron correlations are strong in these materials [8-14], and hence a central
question is whether or not magnetism is present as a consequence of these
interactions. Here we report muon spin rotation/relaxation studies of a series
of superconducting infinite-layer nickelates. In all cases we observe an
intrinsic magnetic ground state, regardless of the rare earth ion or doping,
arising from local moments on the nickel sublattice. The coexistence of
magnetism - which is likely to be antiferromagnetic and short-range ordered -
with superconductivity is reminiscent of some iron pnictides [15] and heavy
fermion compounds [16], and qualitatively distinct from the doped cuprates
[17]
Integrating methods for ecosystem service assessment and valuation: Mixed methods or mixed messages?
A mixed-method approach was used to assess and value the ecosystem services derived from the Dogger Bank, an extensive shallow sandbank in the southern North Sea. Three parallel studies were undertaken that 1) identified and quantified, where possible, how indicators for ecosystem service provision may change according to two future scenarios, 2) assessed members of the public's willingness-to-pay for improvements to a small number of ecosystem services as a consequence of a hypothetical management plan, and 3) facilitated a process of deliberation that allowed members of the public to explore the uses of the Dogger Bank and the conflicts and dilemmas involved in its management. Each of these studies was designed to answer different and specific research questions and therefore contributes different insights about the ecosystem services delivered by the Dogger Bank. This paper explores what can be gained by bringing these findings together post hoc and the extent to which the different methods are complementary. Findings suggest that mixed-method research brings more understanding than can be gained from the individual approaches alone. Nevertheless, the choice of methods used and how these methods are implemented strongly affects the results obtained
The James Webb Space Telescope Mission: Optical Telescope Element Design, Development, and Performance
The James Webb Space Telescope (JWST) is a large, infrared space telescope
that has recently started its science program which will enable breakthroughs
in astrophysics and planetary science. Notably, JWST will provide the very
first observations of the earliest luminous objects in the Universe and start a
new era of exoplanet atmospheric characterization. This transformative science
is enabled by a 6.6 m telescope that is passively cooled with a 5-layer
sunshield. The primary mirror is comprised of 18 controllable, low areal
density hexagonal segments, that were aligned and phased relative to each other
in orbit using innovative image-based wavefront sensing and control algorithms.
This revolutionary telescope took more than two decades to develop with a
widely distributed team across engineering disciplines. We present an overview
of the telescope requirements, architecture, development, superb on-orbit
performance, and lessons learned. JWST successfully demonstrates a segmented
aperture space telescope and establishes a path to building even larger space
telescopes.Comment: accepted by PASP for JWST Overview Special Issue; 34 pages, 25
figure
The Human Dimensions of the European Fisheries Governance : the North/South divide
EThOS - Electronic Theses Online ServiceGBUnited Kingdo