Analysis of the theory of high energy ion transport

Procedures for the approximation of the transport of high-energy ions are discussed on the basis of available data on ion nuclear reactions. A straightahead approximation appears appropriate for space applications. The assumption that the secondary-ion-fragment velocity is equal to that of the fragmenting nucleus is inferior to straightahead theory but is of sufficient accuracy if the primary ions display a broad energy spectrum. An iterative scheme for the solution of the inhomogenous integral transport equations holds promise for practical calculation. A model calculation shows that multiple charged ion fragments penetrate to greater depths in comparison with the free path of a primary heavy ion

Intermediate energy proton-deuteron elastic scattering

A fully symmetrized multiple scattering series is considered for the description of proton-deuteron elastic scattering. An off-shell continuation of the experimentally known twobody amplitudes that retains the exchange symmeteries required for the calculation is presented. The one boson exchange terms of the two body amplitudes are evaluated exactly in this off-shell prescription. The first two terms of the multiple scattering series are calculated explicitly whereas multiple scattering effects are obtained as minimum variance estimates from the 146-MeV data of Postma and Wilson. The multiple scattering corrections indeed consist of low order partial waves as suggested by Sloan based on model studies with separable interactions. The Hamada-Johnston wave function is shown consistent with the data for internucleon distances greater than about 0.84 fm

Heavy ion transport in the straight ahead approximation

An as yet unsolved problem in space radiation protection is the necessary relation between the external cosmic ray heavy ion fluence and the resultant environment within the spacecraft. Such a relation involves the transport of such ions through extended materials. Presented is a derivation of the solution of the transport equation for heavy ions in the straight ahead approximation for directed beam applications. An iterative scheme for the solution of the inhomogeneous integral transport equations is applied to a neon ion beam in water. The iterative scheme requires transport coefficients as input, which are determined from the available data on ion nuclear reactions. The iteration converged for the neon beam in water. Thus this iterative scheme appears to be a suitable approximation of heavy ion transport

Tables of nuclear cross sections for galactic cosmic rays: Absorption cross sections

A simple but comprehensive theory of nuclear reactions is presented. Extensive tables of nucleon, deuteron, and heavy-ion absorption cross sections over a broad range of energies are generated for use in cosmic ray shielding studies. Numerous comparisons of the calculated values with available experimental data show agreement to within 3 percent for energies above 80 MeV/nucleon and within approximately 10 percent for energies as low as 30 MeV/nucleon. These tables represent the culmination of the development of the absorption cross section formalism and supersede the preliminary absorption cross sections published previously in NASA TN D-8107, NASA TP-2138, and NASA TM-84636

The VA Health Care System: An Unrecognized National Safety Net

The dominance of local health care markets in conjunction with variable public funding results in a national patchwork of "safety nets" and beneficiaries in the United States rather than a uniform system. This DataWatch describes how the recently reorganized Department of Veterans Affairs serves as a coordinated, national safety-net provider and characterizes the veterans who are not supported by the market-based system

Leveraging HTC for UK eScience with very large Condor pools: demand for transforming untapped power into results

We provide an insight into the demand from the UK eScience community for very large HighThroughput Computing resources and provide an example of such a resource in current productionuse: the 930-node eMinerals Condor pool at UCL. We demonstrate the significant benefits thisresource has provided to UK eScientists via quickly and easily realising results throughout a rangeof problem areas. We demonstrate the value added by the pool to UCL I.S infrastructure andprovide a case for the expansion of very large Condor resources within the UK eScience Gridinfrastructure. We provide examples of the technical and administrative difficulties faced whenscaling up to institutional Condor pools, and propose the introduction of a UK Condor/HTCworking group to co-ordinate the mid to long term UK eScience Condor development, deploymentand support requirements, starting with the inaugural UK Condor Week in October 2004

Ontogeny of the Tibial Spur in \u3ci\u3eMegamelus Davisi\u3c/i\u3e (Homoptera: Delphacidae) and its Bearing on Delphacid Classification

The forms of the nymphal tibial spur in Megamelus davisi Van Duzee, and their relation to Muir\u27s classification of delphacid subfamilies and tribes, are discussed

Ways of seeing evaluation

Copyright @ 2011 Brunel UniversityThis report summarises the evaluation of Ways of Seeing, a community arts project funded by the Heritage Lottery Fund and hosted by the Lightbox, Woking, Surrey from 2008-11. The people involved have had remarkable experiences, choosing how to take part in each stage of preparations for a major public art exhibition. All those involved had disabilities, primarily arising from mental health issues but also including physical disabilities. The project was skilfully designed and led to enable them to make a significant contribution, enhancing their well-being and resulting in the Ways of Seeing exhibition which was widely appreciated. The Lightbox is an award-winning museum, housing a permanent local history exhibition as well as touring major art exhibitions. The Ingram Modern Art collection is on permanent loan, with regular exhibitions of work from the collection. Since the Lightbox opened in 2007, it has had a stated intention to promote local community involvement, successfully obtaining external funding to support this work. Ways of Seeing was the most ambitious project to date, aiming to exhibit selected work from the Ingram Collection alongside art created as part of the project by local disabled people. The emphasis on ways of seeing reflected an interest in their diverse perspectives, especially in relation to long term mental health problems. A steering group was set up, with members from local mental health initiatives and an evaluation team from Brunel University. The project started by orientating participants to how art is created and exhibited, with a series of visits and workshops on major art collections and artists’ studios. This stage successfully attracted a range of people and was followed by taster workshops of different art techniques. Then participants examined every item in the Ingram Collection and agreed a selection to inspire their own artistic responses. All-day workshops were convened, covering the same techniques as before and giving everyone space and time to get started. Curation of the exhibition gathered pace as final selections were made from participants’ art works and the Ingram Collection. The exhibition offered opportunities for everyone to have selections of their work exhibited to the public alongside the selected work from the Ingram Collection. A video artist captured the project in film and an MSc occupational therapy student from Brunel University undertook independent interviews of participants. It is clear that this multi-stage and carefully considered approach was highly successful in engaging people who are often excluded from arts events and venues. It was also successful in engaging the public in an innovative and thought-provoking exhibition, challenging assumptions about mental health and promoting the benefits of participation. The willingness of the Lightbox to host and support the project was essential. Based on tolerance, respect and a sympathetic curiosity, with clear and skilled leadership, the project enabled participants to make significant changes in their own lives.This study was funded by the Heritage Lottery Fund

Notes on the Biology of \u3ci\u3eNersia Florens\u3c/i\u3e (Homoptera: Fulgoroidea: Dictyopharidae) with Descriptions of Eggs, and First, Second, and Fifth Instars

Information on food plants and laboratory rearing of Nersia florens Stal is provided, and the eggs and Ist, 2nd, and 5th instars are described

The effect of stirring on the heterogeneous nucleation of water and of clathrates of tetrahydrofuran/water mixtures

The statistics of liquid-to-crystal nucleation are measured for both water and for clathrate-forming mixtures of tetrahydrofuran (THF) and water using an automatic lag time apparatus (ALTA). We measure the nucleation temperature using this apparatus in which a single sample is repeatedly cooled, nucleated and thawed. The effect of stirring on nucleation has been evaluated numerically and is discussed. We find that stirring of the solution makes no difference to the nucleation temperature of a given solution in a given tube.Comment: 4 pages, 4 figure