22,868 research outputs found
Differential forms, Fukaya algebras, and Gromov-Witten axioms
Consider the differential forms on a Lagrangian submanifold . Following ideas of Fukaya-Oh-Ohta-Ono, we construct a family of
cyclic unital curved structures on parameterized by the
cohomology of relative to The family of structures
satisfies properties analogous to the axioms of Gromov-Witten theory. Our
construction is canonical up to pseudoisotopy. We work in the
situation that moduli spaces are regular and boundary evaluation maps are
submersions, and thus we do not use the theory of the virtual fundamental
class.Comment: 51 pages, 6 figures; improved exposition, added illustrations,
corrected minor errors, added reference
Evaluation of the organisation and delivery of patient-centred acute nursing care
In 2002, a team of researchers from the School of Nursing, University of Salford were commissioned by Bolton Hospitals NHS Trust to evaluate the delivery and organisation of patient-centred nursing care across the acute nursing wards within the Royal Bolton Hospital.
The key driver for the commissioning of this study arose from two serious untoward incidents that occurred in the year 2000. Following investigation of both these events the Director of Nursing in post at that time believed that poor organisation and delivery of care may have been a contributory factor. Senior nurses in the Trust had also expressed their concern that care may not be organised in a way that made best use of the skills available
The essential signature of a massive starburst in a distant galaxy
Observations of carbon monoxide (CO) emission in high redshift (z>2) galaxies
indicate the presence of large amounts of molecular gas. Many of these galaxies
contain an active galactic nucleus (AGN) powered by accretion of gas onto a
supermassive black hole, and a key question is whether their extremely high
infrared luminosities result from the AGN, or from bursts of massive star
formation (associated with the molecular gas), or both. In the Milky Way,
high-mass stars form in the dense cores of interstellar molecular clouds; gas
densities are n(H2)>105 cm-3 in the cores. Recent surveys show that virtually
all galactic sites of high-mass star formation have similarly high densities.
The bulk of the cloud material traced by CO observations is at a much lower
density. In galaxies in the local Universe, the HCN(J=1-0) line is an effective
tracer of the high-density molecular gas. Here we report observations of HCN
emission in the early Universe from the infrared luminous 'Cloverleaf' quasar
(at a redshift z=2.5579). The HCN line luminosity indicates the presence of 10
billion solar masses of very dense gas, an essential feature of an immense
starburst that contributes, together with the AGN it harbors, to its high
infrared luminosity.Comment: PDF pape
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