Prevalence, incidence and etiology of hyponatremia in elderly patients with fragility fractures

Peer reviewedPublisher PD

The Cast Structure of High-Speed Steel

The cause and effects of the formation of coarse cellular carbides in high-speed steels are reviewed and attention is drawn to possible methods of investigating the problem and perhaps eliminating it

The Maxwell–Vlasov equations in Euler–Poincaré form

Low's well-known action principle for the Maxwell–Vlasov equations of ideal plasma dynamics was originally expressed in terms of a mixture of Eulerian and Lagrangian variables. By imposing suitable constraints on the variations and analyzing invariance properties of the Lagrangian, as one does for the Euler equations for the rigid body and ideal fluids, we first transform this action principle into purely Eulerian variables. Hamilton's principle for the Eulerian description of Low's action principle then casts the Maxwell–Vlasov equations into Euler–Poincaré form for right invariant motion on the diffeomorphism group of position-velocity phase space, [openface R]6. Legendre transforming the Eulerian form of Low's action principle produces the Hamiltonian formulation of these equations in the Eulerian description. Since it arises from Euler–Poincaré equations, this Hamiltonian formulation can be written in terms of a Poisson structure that contains the Lie–Poisson bracket on the dual of a semidirect product Lie algebra. Because of degeneracies in the Lagrangian, the Legendre transform is dealt with using the Dirac theory of constraints. Another Maxwell–Vlasov Poisson structure is known, whose ingredients are the Lie–Poisson bracket on the dual of the Lie algebra of symplectomorphisms of phase space and the Born–Infeld brackets for the Maxwell field. We discuss the relationship between these two Hamiltonian formulations. We also discuss the general Kelvin–Noether theorem for Euler–Poincaré equations and its meaning in the plasma context

Project MIRRA: Memory – Identity – Rights in Records – Access

Many people who grew up in care have gaps in their childhood memories and unanswered questions about their early lives. In the absence of family photos and stories they turn to records held by the local authorities and charities that looked after them. Accessing these records is a practically and emotionally challenging process. Response times are often long and the records received are redacted because they include confidential information about “third parties’” who are often family and carers. The language and ideas contained reflect the prejudices and assumptions of previous times. Some files are extremely long and confusing, whereas others only have a few pages to cover a whole childhood. Records may have been lost or destroyed altogether. Very few services are available to support people through the experience. MIRRA: Memory–Identity–Rights in Records–Access is a participatory action research project carried out at the Department of Information Studies at University College London since 2017 that explores these issues. It considered how child social care records have been created, kept and used in public and voluntary organizations in England from 1970 to the present. The research is co-produced with care leavers in partnership with The Care Leavers’Association and reflects on how what it is recorded about a childhood can affect the individual concerned throughout their life. This article republishes edited blog posts produced during the research project. The original blogs in full are available at https://blogs.ucl.ac.uk/mirra/

Prognosis of hyponatremia in elderly patients with fragility fractures

Funding This work is supported by an NHS Research Scotland (NRS) Career Research Fellowship to Dr Soiza.Peer reviewedPublisher PD

The Effect of Human Insect Repellents on Perennial Ryegrass (Lolium perenne) Growth and Recovery

Turfgrass damage has been observed from misapplications of human insect repellents. Minimal research has been conducted to determine the cause of the damage. Greenhouse research trials were initiated in November 2016 to survey various human insect repellents on turfgrass growth and recovery. Insect repellents resulted in a wide range of damage. No common trend was observed, although the research trial shows possible repellents to be used around turfgrass that will minimize turfgrass injury

Testing extra dimensions with boundaries using Newton's law modifications

Extra dimensions with boundaries are often used in the literature, to provide phenomenological models that mimic the standard model. In this context, we explore possible modifications to Newton's law due to the existence of an extra-dimensional space, at the boundary of which the gravitational field obeys Dirichlet, Neumann or mixed boundary conditions. We focus on two types of extra space, namely, the disk and the interval. As we prove, in order to have a consistent Newton's law modification (i.e., of the Yukawa-type), some of the extra-dimensional spaces that have been used in the literature, must be ruled out.Comment: Published version, title changed, 6 figure

A Century of Cosmology

In the century since Einstein's anno mirabilis of 1905, our concept of the Universe has expanded from Kapteyn's flattened disk of stars only 10 kpc across to an observed horizon about 30 Gpc across that is only a tiny fraction of an immensely large inflated bubble. The expansion of our knowledge about the Universe, both in the types of data and the sheer quantity of data, has been just as dramatic. This talk will summarize this century of progress and our current understanding of the cosmos.Comment: Talk presented at the "Relativistic Astrophysics and Cosmology - Einstein's Legacy" meeting in Munich, Nov 2005. Proceedings will be published in the Springer-Verlag "ESO Astrophysics Symposia" series. 10 pages Latex with 2 figure